| File: | out/../deps/ngtcp2/ngtcp2/lib/ngtcp2_conn.c |
| Warning: | line 9879, column 17 Value stored to 'pktns' during its initialization is never read |
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| 1 | /* |
| 2 | * ngtcp2 |
| 3 | * |
| 4 | * Copyright (c) 2017 ngtcp2 contributors |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining |
| 7 | * a copy of this software and associated documentation files (the |
| 8 | * "Software"), to deal in the Software without restriction, including |
| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
| 10 | * distribute, sublicense, and/or sell copies of the Software, and to |
| 11 | * permit persons to whom the Software is furnished to do so, subject to |
| 12 | * the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice shall be |
| 15 | * included in all copies or substantial portions of the Software. |
| 16 | * |
| 17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 18 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 19 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| 20 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| 21 | * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| 22 | * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| 23 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 24 | */ |
| 25 | #include "ngtcp2_conn.h" |
| 26 | |
| 27 | #include <string.h> |
| 28 | #include <assert.h> |
| 29 | #include <math.h> |
| 30 | |
| 31 | #include "ngtcp2_macro.h" |
| 32 | #include "ngtcp2_log.h" |
| 33 | #include "ngtcp2_cid.h" |
| 34 | #include "ngtcp2_conv.h" |
| 35 | #include "ngtcp2_vec.h" |
| 36 | #include "ngtcp2_addr.h" |
| 37 | #include "ngtcp2_path.h" |
| 38 | #include "ngtcp2_rcvry.h" |
| 39 | |
| 40 | /* NGTCP2_FLOW_WINDOW_RTT_FACTOR is the factor of RTT when flow |
| 41 | control window auto-tuning is triggered. */ |
| 42 | #define NGTCP2_FLOW_WINDOW_RTT_FACTOR2 2 |
| 43 | /* NGTCP2_FLOW_WINDOW_SCALING_FACTOR is the growth factor of flow |
| 44 | control window. */ |
| 45 | #define NGTCP2_FLOW_WINDOW_SCALING_FACTOR2 2 |
| 46 | |
| 47 | /* |
| 48 | * conn_local_stream returns nonzero if |stream_id| indicates that it |
| 49 | * is the stream initiated by local endpoint. |
| 50 | */ |
| 51 | static int conn_local_stream(ngtcp2_conn *conn, int64_t stream_id) { |
| 52 | return (uint8_t)(stream_id & 1) == conn->server; |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | * bidi_stream returns nonzero if |stream_id| is a bidirectional |
| 57 | * stream ID. |
| 58 | */ |
| 59 | static int bidi_stream(int64_t stream_id) { return (stream_id & 0x2) == 0; } |
| 60 | |
| 61 | static int conn_call_recv_client_initial(ngtcp2_conn *conn, |
| 62 | const ngtcp2_cid *dcid) { |
| 63 | int rv; |
| 64 | |
| 65 | assert(conn->callbacks.recv_client_initial)((void) (0)); |
| 66 | |
| 67 | rv = conn->callbacks.recv_client_initial(conn, dcid, conn->user_data); |
| 68 | if (rv != 0) { |
| 69 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 70 | } |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int conn_call_handshake_completed(ngtcp2_conn *conn) { |
| 76 | int rv; |
| 77 | |
| 78 | if (!conn->callbacks.handshake_completed) { |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | rv = conn->callbacks.handshake_completed(conn, conn->user_data); |
| 83 | if (rv != 0) { |
| 84 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 85 | } |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | static int conn_call_recv_stream_data(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 91 | uint32_t flags, uint64_t offset, |
| 92 | const uint8_t *data, size_t datalen) { |
| 93 | int rv; |
| 94 | |
| 95 | if (!conn->callbacks.recv_stream_data) { |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | rv = conn->callbacks.recv_stream_data(conn, flags, strm->stream_id, offset, |
| 100 | data, datalen, conn->user_data, |
| 101 | strm->stream_user_data); |
| 102 | if (rv != 0) { |
| 103 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int conn_call_recv_crypto_data(ngtcp2_conn *conn, |
| 110 | ngtcp2_crypto_level crypto_level, |
| 111 | uint64_t offset, const uint8_t *data, |
| 112 | size_t datalen) { |
| 113 | int rv; |
| 114 | |
| 115 | assert(conn->callbacks.recv_crypto_data)((void) (0)); |
| 116 | |
| 117 | rv = conn->callbacks.recv_crypto_data(conn, crypto_level, offset, data, |
| 118 | datalen, conn->user_data); |
| 119 | switch (rv) { |
| 120 | case 0: |
| 121 | case NGTCP2_ERR_CRYPTO-215: |
| 122 | case NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM-217: |
| 123 | case NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM-218: |
| 124 | case NGTCP2_ERR_TRANSPORT_PARAM-234: |
| 125 | case NGTCP2_ERR_PROTO-205: |
| 126 | case NGTCP2_ERR_CALLBACK_FAILURE-502: |
| 127 | return rv; |
| 128 | default: |
| 129 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | static int conn_call_stream_open(ngtcp2_conn *conn, ngtcp2_strm *strm) { |
| 134 | int rv; |
| 135 | |
| 136 | if (!conn->callbacks.stream_open) { |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | rv = conn->callbacks.stream_open(conn, strm->stream_id, conn->user_data); |
| 141 | if (rv != 0) { |
| 142 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 143 | } |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | static int conn_call_stream_close(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 149 | uint64_t app_error_code) { |
| 150 | int rv; |
| 151 | |
| 152 | if (!conn->callbacks.stream_close) { |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | rv = conn->callbacks.stream_close(conn, strm->stream_id, app_error_code, |
| 157 | conn->user_data, strm->stream_user_data); |
| 158 | if (rv != 0) { |
| 159 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static int conn_call_stream_reset(ngtcp2_conn *conn, int64_t stream_id, |
| 166 | uint64_t final_size, uint64_t app_error_code, |
| 167 | void *stream_user_data) { |
| 168 | int rv; |
| 169 | |
| 170 | if (!conn->callbacks.stream_reset) { |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | rv = conn->callbacks.stream_reset(conn, stream_id, final_size, app_error_code, |
| 175 | conn->user_data, stream_user_data); |
| 176 | if (rv != 0) { |
| 177 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 178 | } |
| 179 | |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | static int conn_call_extend_max_local_streams_bidi(ngtcp2_conn *conn, |
| 184 | uint64_t max_streams) { |
| 185 | int rv; |
| 186 | |
| 187 | if (!conn->callbacks.extend_max_local_streams_bidi) { |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | rv = conn->callbacks.extend_max_local_streams_bidi(conn, max_streams, |
| 192 | conn->user_data); |
| 193 | if (rv != 0) { |
| 194 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int conn_call_extend_max_local_streams_uni(ngtcp2_conn *conn, |
| 201 | uint64_t max_streams) { |
| 202 | int rv; |
| 203 | |
| 204 | if (!conn->callbacks.extend_max_local_streams_uni) { |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | rv = conn->callbacks.extend_max_local_streams_uni(conn, max_streams, |
| 209 | conn->user_data); |
| 210 | if (rv != 0) { |
| 211 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 212 | } |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static int conn_call_get_new_connection_id(ngtcp2_conn *conn, ngtcp2_cid *cid, |
| 218 | uint8_t *token, size_t cidlen) { |
| 219 | int rv; |
| 220 | |
| 221 | assert(conn->callbacks.get_new_connection_id)((void) (0)); |
| 222 | |
| 223 | rv = conn->callbacks.get_new_connection_id(conn, cid, token, cidlen, |
| 224 | conn->user_data); |
| 225 | if (rv != 0) { |
| 226 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 227 | } |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static int conn_call_remove_connection_id(ngtcp2_conn *conn, |
| 233 | const ngtcp2_cid *cid) { |
| 234 | int rv; |
| 235 | |
| 236 | if (!conn->callbacks.remove_connection_id) { |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | rv = conn->callbacks.remove_connection_id(conn, cid, conn->user_data); |
| 241 | if (rv != 0) { |
| 242 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 243 | } |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int conn_call_path_validation(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 249 | ngtcp2_path_validation_result res) { |
| 250 | int rv; |
| 251 | |
| 252 | if (!conn->callbacks.path_validation) { |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | rv = conn->callbacks.path_validation(conn, path, res, conn->user_data); |
| 257 | if (rv != 0) { |
| 258 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 259 | } |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
| 264 | static int conn_call_select_preferred_addr(ngtcp2_conn *conn, |
| 265 | ngtcp2_addr *dest) { |
| 266 | int rv; |
| 267 | |
| 268 | if (!conn->callbacks.select_preferred_addr) { |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | assert(conn->remote.transport_params.preferred_address_present)((void) (0)); |
| 273 | |
| 274 | rv = conn->callbacks.select_preferred_addr( |
| 275 | conn, dest, &conn->remote.transport_params.preferred_address, |
| 276 | conn->user_data); |
| 277 | if (rv != 0) { |
| 278 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int conn_call_extend_max_remote_streams_bidi(ngtcp2_conn *conn, |
| 285 | uint64_t max_streams) { |
| 286 | int rv; |
| 287 | |
| 288 | if (!conn->callbacks.extend_max_remote_streams_bidi) { |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | rv = conn->callbacks.extend_max_remote_streams_bidi(conn, max_streams, |
| 293 | conn->user_data); |
| 294 | if (rv != 0) { |
| 295 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 296 | } |
| 297 | |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static int conn_call_extend_max_remote_streams_uni(ngtcp2_conn *conn, |
| 302 | uint64_t max_streams) { |
| 303 | int rv; |
| 304 | |
| 305 | if (!conn->callbacks.extend_max_remote_streams_uni) { |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | rv = conn->callbacks.extend_max_remote_streams_uni(conn, max_streams, |
| 310 | conn->user_data); |
| 311 | if (rv != 0) { |
| 312 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 313 | } |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static int conn_call_extend_max_stream_data(ngtcp2_conn *conn, |
| 319 | ngtcp2_strm *strm, |
| 320 | int64_t stream_id, |
| 321 | uint64_t datalen) { |
| 322 | int rv; |
| 323 | |
| 324 | if (!conn->callbacks.extend_max_stream_data) { |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | rv = conn->callbacks.extend_max_stream_data( |
| 329 | conn, stream_id, datalen, conn->user_data, strm->stream_user_data); |
| 330 | if (rv != 0) { |
| 331 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 332 | } |
| 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | static int conn_call_dcid_status(ngtcp2_conn *conn, |
| 338 | ngtcp2_connection_id_status_type type, |
| 339 | const ngtcp2_dcid *dcid) { |
| 340 | int rv; |
| 341 | |
| 342 | if (!conn->callbacks.dcid_status) { |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | rv = conn->callbacks.dcid_status( |
| 347 | conn, (int)type, dcid->seq, &dcid->cid, |
| 348 | ngtcp2_check_invalid_stateless_reset_token(dcid->token) ? NULL((void*)0) |
| 349 | : dcid->token, |
| 350 | conn->user_data); |
| 351 | if (rv != 0) { |
| 352 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 353 | } |
| 354 | |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | static int conn_call_activate_dcid(ngtcp2_conn *conn, const ngtcp2_dcid *dcid) { |
| 359 | return conn_call_dcid_status(conn, NGTCP2_CONNECTION_ID_STATUS_TYPE_ACTIVATE, |
| 360 | dcid); |
| 361 | } |
| 362 | |
| 363 | static int conn_call_deactivate_dcid(ngtcp2_conn *conn, |
| 364 | const ngtcp2_dcid *dcid) { |
| 365 | return conn_call_dcid_status( |
| 366 | conn, NGTCP2_CONNECTION_ID_STATUS_TYPE_DEACTIVATE, dcid); |
| 367 | } |
| 368 | |
| 369 | static void conn_call_delete_crypto_aead_ctx(ngtcp2_conn *conn, |
| 370 | ngtcp2_crypto_aead_ctx *aead_ctx) { |
| 371 | if (!aead_ctx->native_handle) { |
| 372 | return; |
| 373 | } |
| 374 | |
| 375 | assert(conn->callbacks.delete_crypto_aead_ctx)((void) (0)); |
| 376 | |
| 377 | conn->callbacks.delete_crypto_aead_ctx(conn, aead_ctx, conn->user_data); |
| 378 | } |
| 379 | |
| 380 | static void |
| 381 | conn_call_delete_crypto_cipher_ctx(ngtcp2_conn *conn, |
| 382 | ngtcp2_crypto_cipher_ctx *cipher_ctx) { |
| 383 | if (!cipher_ctx->native_handle) { |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | assert(conn->callbacks.delete_crypto_cipher_ctx)((void) (0)); |
| 388 | |
| 389 | conn->callbacks.delete_crypto_cipher_ctx(conn, cipher_ctx, conn->user_data); |
| 390 | } |
| 391 | |
| 392 | static int crypto_offset_less(const ngtcp2_ksl_key *lhs, |
| 393 | const ngtcp2_ksl_key *rhs) { |
| 394 | return *(int64_t *)lhs < *(int64_t *)rhs; |
| 395 | } |
| 396 | |
| 397 | static int pktns_init(ngtcp2_pktns *pktns, ngtcp2_pktns_id pktns_id, |
| 398 | ngtcp2_rst *rst, ngtcp2_cc *cc, ngtcp2_log *log, |
| 399 | ngtcp2_qlog *qlog, const ngtcp2_mem *mem) { |
| 400 | int rv; |
| 401 | |
| 402 | memset(pktns, 0, sizeof(*pktns)); |
| 403 | |
| 404 | rv = ngtcp2_gaptr_init(&pktns->rx.pngap, mem); |
| 405 | if (rv != 0) { |
| 406 | return rv; |
| 407 | } |
| 408 | |
| 409 | pktns->tx.last_pkt_num = -1; |
| 410 | pktns->rx.max_pkt_num = -1; |
| 411 | pktns->rx.max_ack_eliciting_pkt_num = -1; |
| 412 | |
| 413 | rv = ngtcp2_acktr_init(&pktns->acktr, log, mem); |
| 414 | if (rv != 0) { |
| 415 | goto fail_acktr_init; |
| 416 | } |
| 417 | |
| 418 | rv = ngtcp2_strm_init(&pktns->crypto.strm, 0, NGTCP2_STRM_FLAG_NONE0x00, 0, 0, |
| 419 | NULL((void*)0), mem); |
| 420 | if (rv != 0) { |
| 421 | goto fail_crypto_init; |
| 422 | } |
| 423 | |
| 424 | rv = ngtcp2_ksl_init(&pktns->crypto.tx.frq, crypto_offset_less, |
| 425 | sizeof(uint64_t), mem); |
| 426 | if (rv != 0) { |
| 427 | goto fail_tx_frq_init; |
| 428 | } |
| 429 | |
| 430 | ngtcp2_rtb_init(&pktns->rtb, pktns_id, &pktns->crypto.strm, rst, cc, log, |
| 431 | qlog, mem); |
| 432 | |
| 433 | return 0; |
| 434 | |
| 435 | fail_tx_frq_init: |
| 436 | ngtcp2_strm_free(&pktns->crypto.strm); |
| 437 | fail_crypto_init: |
| 438 | ngtcp2_acktr_free(&pktns->acktr); |
| 439 | fail_acktr_init: |
| 440 | ngtcp2_gaptr_free(&pktns->rx.pngap); |
| 441 | |
| 442 | return rv; |
| 443 | } |
| 444 | |
| 445 | static int pktns_new(ngtcp2_pktns **ppktns, ngtcp2_pktns_id pktns_id, |
| 446 | ngtcp2_rst *rst, ngtcp2_cc *cc, ngtcp2_log *log, |
| 447 | ngtcp2_qlog *qlog, const ngtcp2_mem *mem) { |
| 448 | int rv; |
| 449 | |
| 450 | *ppktns = ngtcp2_mem_malloc(mem, sizeof(ngtcp2_pktns)); |
| 451 | if (*ppktns == NULL((void*)0)) { |
| 452 | return NGTCP2_ERR_NOMEM-501; |
| 453 | } |
| 454 | |
| 455 | rv = pktns_init(*ppktns, pktns_id, rst, cc, log, qlog, mem); |
| 456 | if (rv != 0) { |
| 457 | ngtcp2_mem_free(mem, *ppktns); |
| 458 | } |
| 459 | |
| 460 | return rv; |
| 461 | } |
| 462 | |
| 463 | static int cycle_less(const ngtcp2_pq_entry *lhs, const ngtcp2_pq_entry *rhs) { |
| 464 | ngtcp2_strm *ls = ngtcp2_struct_of(lhs, ngtcp2_strm, pe)((ngtcp2_strm *)(void *)((char *)(lhs)-__builtin_offsetof(ngtcp2_strm , pe))); |
| 465 | ngtcp2_strm *rs = ngtcp2_struct_of(rhs, ngtcp2_strm, pe)((ngtcp2_strm *)(void *)((char *)(rhs)-__builtin_offsetof(ngtcp2_strm , pe))); |
| 466 | |
| 467 | if (ls->cycle == rs->cycle) { |
| 468 | return ls->stream_id < rs->stream_id; |
| 469 | } |
| 470 | |
| 471 | return rs->cycle - ls->cycle <= 1; |
| 472 | } |
| 473 | |
| 474 | static void delete_buffed_pkts(ngtcp2_pkt_chain *pc, const ngtcp2_mem *mem) { |
| 475 | ngtcp2_pkt_chain *next; |
| 476 | |
| 477 | for (; pc;) { |
| 478 | next = pc->next; |
| 479 | ngtcp2_pkt_chain_del(pc, mem); |
| 480 | pc = next; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | static void pktns_free(ngtcp2_pktns *pktns, const ngtcp2_mem *mem) { |
| 485 | ngtcp2_frame_chain *frc; |
| 486 | ngtcp2_ksl_it it; |
| 487 | |
| 488 | delete_buffed_pkts(pktns->rx.buffed_pkts, mem); |
| 489 | |
| 490 | ngtcp2_frame_chain_list_del(pktns->tx.frq, mem); |
| 491 | |
| 492 | ngtcp2_crypto_km_del(pktns->crypto.rx.ckm, mem); |
| 493 | ngtcp2_crypto_km_del(pktns->crypto.tx.ckm, mem); |
| 494 | |
| 495 | for (it = ngtcp2_ksl_begin(&pktns->crypto.tx.frq); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 496 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 497 | frc = ngtcp2_ksl_it_get(&it); |
| 498 | ngtcp2_frame_chain_del(frc, mem); |
| 499 | } |
| 500 | |
| 501 | ngtcp2_ksl_free(&pktns->crypto.tx.frq); |
| 502 | ngtcp2_rtb_free(&pktns->rtb); |
| 503 | ngtcp2_strm_free(&pktns->crypto.strm); |
| 504 | ngtcp2_acktr_free(&pktns->acktr); |
| 505 | ngtcp2_gaptr_free(&pktns->rx.pngap); |
| 506 | } |
| 507 | |
| 508 | static void pktns_del(ngtcp2_pktns *pktns, const ngtcp2_mem *mem) { |
| 509 | if (pktns == NULL((void*)0)) { |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | pktns_free(pktns, mem); |
| 514 | |
| 515 | ngtcp2_mem_free(mem, pktns); |
| 516 | } |
| 517 | |
| 518 | static void cc_del(ngtcp2_cc *cc, ngtcp2_cc_algo cc_algo, |
| 519 | const ngtcp2_mem *mem) { |
| 520 | switch (cc_algo) { |
| 521 | case NGTCP2_CC_ALGO_RENO: |
| 522 | ngtcp2_cc_reno_cc_free(cc, mem); |
| 523 | break; |
| 524 | case NGTCP2_CC_ALGO_CUBIC: |
| 525 | ngtcp2_cc_cubic_cc_free(cc, mem); |
| 526 | break; |
| 527 | default: |
| 528 | break; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | static int cid_less(const ngtcp2_ksl_key *lhs, const ngtcp2_ksl_key *rhs) { |
| 533 | return ngtcp2_cid_less(lhs, rhs); |
| 534 | } |
| 535 | |
| 536 | static int ts_retired_less(const ngtcp2_pq_entry *lhs, |
| 537 | const ngtcp2_pq_entry *rhs) { |
| 538 | const ngtcp2_scid *a = ngtcp2_struct_of(lhs, ngtcp2_scid, pe)((ngtcp2_scid *)(void *)((char *)(lhs)-__builtin_offsetof(ngtcp2_scid , pe))); |
| 539 | const ngtcp2_scid *b = ngtcp2_struct_of(rhs, ngtcp2_scid, pe)((ngtcp2_scid *)(void *)((char *)(rhs)-__builtin_offsetof(ngtcp2_scid , pe))); |
| 540 | |
| 541 | return a->ts_retired < b->ts_retired; |
| 542 | } |
| 543 | |
| 544 | /* |
| 545 | * conn_reset_conn_stat_cc resets congestion state in |cstat|. |
| 546 | */ |
| 547 | static void conn_reset_conn_stat_cc(ngtcp2_conn *conn, |
| 548 | ngtcp2_conn_stat *cstat) { |
| 549 | cstat->latest_rtt = 0; |
| 550 | cstat->min_rtt = UINT64_MAX(18446744073709551615UL); |
| 551 | cstat->smoothed_rtt = conn->local.settings.initial_rtt; |
| 552 | cstat->rttvar = conn->local.settings.initial_rtt / 2; |
| 553 | cstat->first_rtt_sample_ts = UINT64_MAX(18446744073709551615UL); |
| 554 | cstat->pto_count = 0; |
| 555 | cstat->loss_detection_timer = UINT64_MAX(18446744073709551615UL); |
| 556 | cstat->cwnd = |
| 557 | ngtcp2_cc_compute_initcwnd(conn->local.settings.max_udp_payload_size); |
| 558 | cstat->ssthresh = UINT64_MAX(18446744073709551615UL); |
| 559 | cstat->congestion_recovery_start_ts = UINT64_MAX(18446744073709551615UL); |
| 560 | cstat->bytes_in_flight = 0; |
| 561 | cstat->delivery_rate_sec = 0; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * reset_conn_stat_recovery resets the fields related to the recovery |
| 566 | * function |
| 567 | */ |
| 568 | static void reset_conn_stat_recovery(ngtcp2_conn_stat *cstat) { |
| 569 | // Initializes them with UINT64_MAX. |
| 570 | memset(cstat->loss_time, 0xff, sizeof(cstat->loss_time)); |
| 571 | memset(cstat->last_tx_pkt_ts, 0xff, sizeof(cstat->last_tx_pkt_ts)); |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * conn_reset_conn_stat resets |cstat|. The following fields are not |
| 576 | * reset: initial_rtt and max_udp_payload_size. |
| 577 | */ |
| 578 | static void conn_reset_conn_stat(ngtcp2_conn *conn, ngtcp2_conn_stat *cstat) { |
| 579 | conn_reset_conn_stat_cc(conn, cstat); |
| 580 | reset_conn_stat_recovery(cstat); |
| 581 | } |
| 582 | |
| 583 | static void delete_scid(ngtcp2_ksl *scids, const ngtcp2_mem *mem) { |
| 584 | ngtcp2_ksl_it it; |
| 585 | |
| 586 | for (it = ngtcp2_ksl_begin(scids); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 587 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 588 | ngtcp2_mem_free(mem, ngtcp2_ksl_it_get(&it)); |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * compute_pto computes PTO. |
| 594 | */ |
| 595 | static ngtcp2_duration compute_pto(ngtcp2_duration smoothed_rtt, |
| 596 | ngtcp2_duration rttvar, |
| 597 | ngtcp2_duration max_ack_delay) { |
| 598 | ngtcp2_duration var = ngtcp2_max(4 * rttvar, NGTCP2_GRANULARITY)((4 * rttvar) > (((uint64_t)1000000ULL)) ? (4 * rttvar) : ( ((uint64_t)1000000ULL))); |
| 599 | return smoothed_rtt + var + max_ack_delay; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * conn_compute_initial_pto computes PTO using the initial RTT. |
| 604 | */ |
| 605 | static ngtcp2_duration conn_compute_initial_pto(ngtcp2_conn *conn, |
| 606 | ngtcp2_pktns *pktns) { |
| 607 | ngtcp2_duration initial_rtt = conn->local.settings.initial_rtt; |
| 608 | ngtcp2_duration max_ack_delay = |
| 609 | pktns->rtb.pktns_id == NGTCP2_PKTNS_ID_APPLICATION |
| 610 | ? conn->remote.transport_params.max_ack_delay |
| 611 | : 0; |
| 612 | return compute_pto(initial_rtt, initial_rtt / 2, max_ack_delay); |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * conn_compute_pto computes the current PTO. |
| 617 | */ |
| 618 | static ngtcp2_duration conn_compute_pto(ngtcp2_conn *conn, |
| 619 | ngtcp2_pktns *pktns) { |
| 620 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 621 | ngtcp2_duration max_ack_delay = |
| 622 | pktns->rtb.pktns_id == NGTCP2_PKTNS_ID_APPLICATION |
| 623 | ? conn->remote.transport_params.max_ack_delay |
| 624 | : 0; |
| 625 | return compute_pto(cstat->smoothed_rtt, cstat->rttvar, max_ack_delay); |
| 626 | } |
| 627 | |
| 628 | static void conn_handle_tx_ecn(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, |
| 629 | uint8_t *prtb_entry_flags, ngtcp2_pktns *pktns, |
| 630 | const ngtcp2_pkt_hd *hd, ngtcp2_tstamp ts) { |
| 631 | assert(pi)((void) (0)); |
| 632 | |
| 633 | if (pi->ecn != NGTCP2_ECN_NOT_ECT0x0) { |
| 634 | /* We have already made a transition of validation state and |
| 635 | deceided to send UDP datagram with ECN bit set. Coalesced QUIC |
| 636 | packets also bear ECN bits set. */ |
| 637 | if (pktns->tx.ecn.start_pkt_num == INT64_MAX(9223372036854775807L)) { |
| 638 | pktns->tx.ecn.start_pkt_num = hd->pkt_num; |
| 639 | } |
| 640 | |
| 641 | ++pktns->tx.ecn.validation_pkt_sent; |
| 642 | |
| 643 | if (prtb_entry_flags) { |
| 644 | *prtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ECN0x20; |
| 645 | } |
| 646 | |
| 647 | ++pktns->tx.ecn.ect0; |
| 648 | |
| 649 | return; |
| 650 | } |
| 651 | |
| 652 | switch (conn->tx.ecn.state) { |
| 653 | case NGTCP2_ECN_STATE_TESTING: |
| 654 | if (conn->tx.ecn.validation_start_ts == UINT64_MAX(18446744073709551615UL)) { |
| 655 | assert(0 == pktns->tx.ecn.validation_pkt_sent)((void) (0)); |
| 656 | assert(0 == pktns->tx.ecn.validation_pkt_lost)((void) (0)); |
| 657 | |
| 658 | conn->tx.ecn.validation_start_ts = ts; |
| 659 | } else if (ts - conn->tx.ecn.validation_start_ts >= |
| 660 | 3 * conn_compute_pto(conn, pktns)) { |
| 661 | conn->tx.ecn.state = NGTCP2_ECN_STATE_UNKNOWN; |
| 662 | break; |
| 663 | } |
| 664 | |
| 665 | if (pktns->tx.ecn.start_pkt_num == INT64_MAX(9223372036854775807L)) { |
| 666 | pktns->tx.ecn.start_pkt_num = hd->pkt_num; |
| 667 | } |
| 668 | |
| 669 | ++pktns->tx.ecn.validation_pkt_sent; |
| 670 | |
| 671 | if (++conn->tx.ecn.dgram_sent == NGTCP2_ECN_MAX_NUM_VALIDATION_PKTS10) { |
| 672 | conn->tx.ecn.state = NGTCP2_ECN_STATE_UNKNOWN; |
| 673 | } |
| 674 | /* fall through */ |
| 675 | case NGTCP2_ECN_STATE_CAPABLE: |
| 676 | /* pi is provided per UDP datagram. */ |
| 677 | assert(NGTCP2_ECN_NOT_ECT == pi->ecn)((void) (0)); |
| 678 | |
| 679 | pi->ecn = NGTCP2_ECN_ECT_00x2; |
| 680 | |
| 681 | if (prtb_entry_flags) { |
| 682 | *prtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ECN0x20; |
| 683 | } |
| 684 | |
| 685 | ++pktns->tx.ecn.ect0; |
| 686 | break; |
| 687 | case NGTCP2_ECN_STATE_UNKNOWN: |
| 688 | case NGTCP2_ECN_STATE_FAILED: |
| 689 | break; |
| 690 | default: |
| 691 | assert(0)((void) (0)); |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | static void conn_reset_ecn_validation_state(ngtcp2_conn *conn) { |
| 696 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 697 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 698 | ngtcp2_pktns *pktns = &conn->pktns; |
| 699 | |
| 700 | conn->tx.ecn.state = NGTCP2_ECN_STATE_TESTING; |
| 701 | conn->tx.ecn.validation_start_ts = UINT64_MAX(18446744073709551615UL); |
| 702 | conn->tx.ecn.dgram_sent = 0; |
| 703 | |
| 704 | if (in_pktns) { |
| 705 | in_pktns->tx.ecn.start_pkt_num = INT64_MAX(9223372036854775807L); |
| 706 | in_pktns->tx.ecn.validation_pkt_sent = 0; |
| 707 | in_pktns->tx.ecn.validation_pkt_lost = 0; |
| 708 | } |
| 709 | |
| 710 | if (hs_pktns) { |
| 711 | hs_pktns->tx.ecn.start_pkt_num = INT64_MAX(9223372036854775807L); |
| 712 | hs_pktns->tx.ecn.validation_pkt_sent = 0; |
| 713 | hs_pktns->tx.ecn.validation_pkt_lost = 0; |
| 714 | } |
| 715 | |
| 716 | pktns->tx.ecn.start_pkt_num = INT64_MAX(9223372036854775807L); |
| 717 | pktns->tx.ecn.validation_pkt_sent = 0; |
| 718 | pktns->tx.ecn.validation_pkt_lost = 0; |
| 719 | } |
| 720 | |
| 721 | static int conn_new(ngtcp2_conn **pconn, const ngtcp2_cid *dcid, |
| 722 | const ngtcp2_cid *scid, const ngtcp2_path *path, |
| 723 | uint32_t version, const ngtcp2_callbacks *callbacks, |
| 724 | const ngtcp2_settings *settings, |
| 725 | const ngtcp2_transport_params *params, |
| 726 | const ngtcp2_mem *mem, void *user_data, int server) { |
| 727 | int rv; |
| 728 | ngtcp2_scid *scident; |
| 729 | uint8_t *buf; |
| 730 | |
| 731 | assert(settings->max_window <= NGTCP2_MAX_VARINT)((void) (0)); |
| 732 | assert(settings->max_stream_window <= NGTCP2_MAX_VARINT)((void) (0)); |
| 733 | assert(params->active_connection_id_limit <= NGTCP2_MAX_DCID_POOL_SIZE)((void) (0)); |
| 734 | assert(params->initial_max_data <= NGTCP2_MAX_VARINT)((void) (0)); |
| 735 | assert(params->initial_max_stream_data_bidi_local <= NGTCP2_MAX_VARINT)((void) (0)); |
| 736 | assert(params->initial_max_stream_data_bidi_remote <= NGTCP2_MAX_VARINT)((void) (0)); |
| 737 | assert(params->initial_max_stream_data_uni <= NGTCP2_MAX_VARINT)((void) (0)); |
| 738 | |
| 739 | if (mem == NULL((void*)0)) { |
| 740 | mem = ngtcp2_mem_default(); |
| 741 | } |
| 742 | |
| 743 | *pconn = ngtcp2_mem_calloc(mem, 1, sizeof(ngtcp2_conn)); |
| 744 | if (*pconn == NULL((void*)0)) { |
| 745 | rv = NGTCP2_ERR_NOMEM-501; |
| 746 | goto fail_conn; |
| 747 | } |
| 748 | |
| 749 | rv = ngtcp2_ringbuf_init(&(*pconn)->dcid.bound, |
| 750 | NGTCP2_MAX_BOUND_DCID_POOL_SIZE4, sizeof(ngtcp2_dcid), |
| 751 | mem); |
| 752 | if (rv != 0) { |
| 753 | goto fail_dcid_bound_init; |
| 754 | } |
| 755 | |
| 756 | rv = ngtcp2_ringbuf_init(&(*pconn)->dcid.unused, NGTCP2_MAX_DCID_POOL_SIZE8, |
| 757 | sizeof(ngtcp2_dcid), mem); |
| 758 | if (rv != 0) { |
| 759 | goto fail_dcid_unused_init; |
| 760 | } |
| 761 | |
| 762 | rv = |
| 763 | ngtcp2_ringbuf_init(&(*pconn)->dcid.retired, NGTCP2_MAX_DCID_RETIRED_SIZE2, |
| 764 | sizeof(ngtcp2_dcid), mem); |
| 765 | if (rv != 0) { |
| 766 | goto fail_dcid_retired_init; |
| 767 | } |
| 768 | |
| 769 | rv = ngtcp2_gaptr_init(&(*pconn)->dcid.seqgap, mem); |
| 770 | if (rv != 0) { |
| 771 | goto fail_seqgap_init; |
| 772 | } |
| 773 | |
| 774 | rv = ngtcp2_ksl_init(&(*pconn)->scid.set, cid_less, sizeof(ngtcp2_cid), mem); |
| 775 | if (rv != 0) { |
| 776 | goto fail_scid_set_init; |
| 777 | } |
| 778 | |
| 779 | ngtcp2_pq_init(&(*pconn)->scid.used, ts_retired_less, mem); |
| 780 | |
| 781 | rv = ngtcp2_map_init(&(*pconn)->strms, mem); |
| 782 | if (rv != 0) { |
| 783 | goto fail_strms_init; |
| 784 | } |
| 785 | |
| 786 | ngtcp2_pq_init(&(*pconn)->tx.strmq, cycle_less, mem); |
| 787 | |
| 788 | rv = ngtcp2_idtr_init(&(*pconn)->remote.bidi.idtr, !server, mem); |
| 789 | if (rv != 0) { |
| 790 | goto fail_remote_bidi_idtr_init; |
| 791 | } |
| 792 | |
| 793 | rv = ngtcp2_idtr_init(&(*pconn)->remote.uni.idtr, !server, mem); |
| 794 | if (rv != 0) { |
| 795 | goto fail_remote_uni_idtr_init; |
| 796 | } |
| 797 | |
| 798 | rv = ngtcp2_ringbuf_init(&(*pconn)->rx.path_challenge, 4, |
| 799 | sizeof(ngtcp2_path_challenge_entry), mem); |
| 800 | if (rv != 0) { |
| 801 | goto fail_rx_path_challenge_init; |
| 802 | } |
| 803 | |
| 804 | ngtcp2_log_init(&(*pconn)->log, scid, settings->log_printf, |
| 805 | settings->initial_ts, user_data); |
| 806 | ngtcp2_qlog_init(&(*pconn)->qlog, settings->qlog.write, settings->initial_ts, |
| 807 | user_data); |
| 808 | if ((*pconn)->qlog.write) { |
| 809 | buf = ngtcp2_mem_malloc(mem, NGTCP2_QLOG_BUFLEN4096); |
| 810 | if (buf == NULL((void*)0)) { |
| 811 | goto fail_qlog_buf; |
| 812 | } |
| 813 | ngtcp2_buf_init(&(*pconn)->qlog.buf, buf, NGTCP2_QLOG_BUFLEN4096); |
| 814 | } |
| 815 | |
| 816 | (*pconn)->local.settings = *settings; |
| 817 | (*pconn)->local.transport_params = *params; |
| 818 | |
| 819 | if (settings->token.len) { |
| 820 | buf = ngtcp2_mem_malloc(mem, settings->token.len); |
| 821 | if (buf == NULL((void*)0)) { |
| 822 | goto fail_token; |
| 823 | } |
| 824 | memcpy(buf, settings->token.base, settings->token.len); |
| 825 | (*pconn)->local.settings.token.base = buf; |
| 826 | } else { |
| 827 | (*pconn)->local.settings.token.base = NULL((void*)0); |
| 828 | (*pconn)->local.settings.token.len = 0; |
| 829 | } |
| 830 | |
| 831 | if (settings->max_udp_payload_size == 0) { |
| 832 | (*pconn)->local.settings.max_udp_payload_size = NGTCP2_DEFAULT_MAX_PKTLEN1200; |
| 833 | } |
| 834 | |
| 835 | conn_reset_conn_stat(*pconn, &(*pconn)->cstat); |
| 836 | (*pconn)->cstat.initial_rtt = settings->initial_rtt; |
| 837 | (*pconn)->cstat.max_udp_payload_size = |
| 838 | (*pconn)->local.settings.max_udp_payload_size; |
| 839 | |
| 840 | ngtcp2_rst_init(&(*pconn)->rst); |
| 841 | |
| 842 | (*pconn)->cc_algo = settings->cc_algo; |
| 843 | |
| 844 | switch (settings->cc_algo) { |
| 845 | case NGTCP2_CC_ALGO_RENO: |
| 846 | rv = ngtcp2_cc_reno_cc_init(&(*pconn)->cc, &(*pconn)->log, mem); |
| 847 | if (rv != 0) { |
| 848 | goto fail_cc_init; |
| 849 | } |
| 850 | break; |
| 851 | case NGTCP2_CC_ALGO_CUBIC: |
| 852 | rv = ngtcp2_cc_cubic_cc_init(&(*pconn)->cc, &(*pconn)->log, mem); |
| 853 | if (rv != 0) { |
| 854 | goto fail_cc_init; |
| 855 | } |
| 856 | break; |
| 857 | case NGTCP2_CC_ALGO_CUSTOM: |
| 858 | assert(settings->cc)((void) (0)); |
| 859 | (*pconn)->cc = *settings->cc; |
| 860 | (*pconn)->cc.ccb->log = &(*pconn)->log; |
| 861 | break; |
| 862 | default: |
| 863 | assert(0)((void) (0)); |
| 864 | } |
| 865 | |
| 866 | rv = pktns_new(&(*pconn)->in_pktns, NGTCP2_PKTNS_ID_INITIAL, &(*pconn)->rst, |
| 867 | &(*pconn)->cc, &(*pconn)->log, &(*pconn)->qlog, mem); |
| 868 | if (rv != 0) { |
| 869 | goto fail_in_pktns_init; |
| 870 | } |
| 871 | |
| 872 | rv = pktns_new(&(*pconn)->hs_pktns, NGTCP2_PKTNS_ID_HANDSHAKE, &(*pconn)->rst, |
| 873 | &(*pconn)->cc, &(*pconn)->log, &(*pconn)->qlog, mem); |
| 874 | if (rv != 0) { |
| 875 | goto fail_hs_pktns_init; |
| 876 | } |
| 877 | |
| 878 | rv = pktns_init(&(*pconn)->pktns, NGTCP2_PKTNS_ID_APPLICATION, &(*pconn)->rst, |
| 879 | &(*pconn)->cc, &(*pconn)->log, &(*pconn)->qlog, mem); |
| 880 | if (rv != 0) { |
| 881 | goto fail_pktns_init; |
| 882 | } |
| 883 | |
| 884 | scident = ngtcp2_mem_malloc(mem, sizeof(*scident)); |
| 885 | if (scident == NULL((void*)0)) { |
| 886 | rv = NGTCP2_ERR_NOMEM-501; |
| 887 | goto fail_scident; |
| 888 | } |
| 889 | |
| 890 | /* Set stateless reset token later if it is available in the local |
| 891 | transport parameters */ |
| 892 | ngtcp2_scid_init(scident, 0, scid, NULL((void*)0)); |
| 893 | |
| 894 | rv = ngtcp2_ksl_insert(&(*pconn)->scid.set, NULL((void*)0), &scident->cid, scident); |
| 895 | if (rv != 0) { |
| 896 | goto fail_scid_set_insert; |
| 897 | } |
| 898 | |
| 899 | scident = NULL((void*)0); |
| 900 | |
| 901 | ngtcp2_dcid_init(&(*pconn)->dcid.current, 0, dcid, NULL((void*)0)); |
| 902 | ngtcp2_path_copy(&(*pconn)->dcid.current.ps.path, path); |
| 903 | |
| 904 | rv = ngtcp2_gaptr_push(&(*pconn)->dcid.seqgap, 0, 1); |
| 905 | if (rv != 0) { |
| 906 | goto fail_seqgap_push; |
| 907 | } |
| 908 | |
| 909 | (*pconn)->server = server; |
| 910 | (*pconn)->oscid = *scid; |
| 911 | (*pconn)->callbacks = *callbacks; |
| 912 | (*pconn)->version = version; |
| 913 | (*pconn)->mem = mem; |
| 914 | (*pconn)->user_data = user_data; |
| 915 | (*pconn)->idle_ts = settings->initial_ts; |
| 916 | (*pconn)->crypto.key_update.confirmed_ts = UINT64_MAX(18446744073709551615UL); |
| 917 | (*pconn)->tx.last_max_data_ts = UINT64_MAX(18446744073709551615UL); |
| 918 | (*pconn)->early.discard_started_ts = UINT64_MAX(18446744073709551615UL); |
| 919 | |
| 920 | conn_reset_ecn_validation_state(*pconn); |
| 921 | |
| 922 | ngtcp2_qlog_start(&(*pconn)->qlog, server ? &settings->qlog.odcid : dcid, |
| 923 | server); |
| 924 | |
| 925 | return 0; |
| 926 | |
| 927 | fail_seqgap_push: |
| 928 | fail_scid_set_insert: |
| 929 | ngtcp2_mem_free(mem, scident); |
| 930 | fail_scident: |
| 931 | ngtcp2_mem_free(mem, (*pconn)->local.settings.token.base); |
| 932 | fail_token: |
| 933 | pktns_free(&(*pconn)->pktns, mem); |
| 934 | fail_pktns_init: |
| 935 | pktns_del((*pconn)->hs_pktns, mem); |
| 936 | fail_hs_pktns_init: |
| 937 | pktns_del((*pconn)->in_pktns, mem); |
| 938 | fail_in_pktns_init: |
| 939 | cc_del(&(*pconn)->cc, settings->cc_algo, mem); |
| 940 | fail_cc_init: |
| 941 | ngtcp2_mem_free(mem, (*pconn)->qlog.buf.begin); |
| 942 | fail_qlog_buf: |
| 943 | ngtcp2_ringbuf_free(&(*pconn)->rx.path_challenge); |
| 944 | fail_rx_path_challenge_init: |
| 945 | ngtcp2_idtr_free(&(*pconn)->remote.uni.idtr); |
| 946 | fail_remote_uni_idtr_init: |
| 947 | ngtcp2_idtr_free(&(*pconn)->remote.bidi.idtr); |
| 948 | fail_remote_bidi_idtr_init: |
| 949 | ngtcp2_map_free(&(*pconn)->strms); |
| 950 | fail_strms_init: |
| 951 | delete_scid(&(*pconn)->scid.set, mem); |
| 952 | ngtcp2_ksl_free(&(*pconn)->scid.set); |
| 953 | fail_scid_set_init: |
| 954 | ngtcp2_gaptr_free(&(*pconn)->dcid.seqgap); |
| 955 | fail_seqgap_init: |
| 956 | ngtcp2_ringbuf_free(&(*pconn)->dcid.retired); |
| 957 | fail_dcid_retired_init: |
| 958 | ngtcp2_ringbuf_free(&(*pconn)->dcid.unused); |
| 959 | fail_dcid_unused_init: |
| 960 | ngtcp2_ringbuf_free(&(*pconn)->dcid.bound); |
| 961 | fail_dcid_bound_init: |
| 962 | ngtcp2_mem_free(mem, *pconn); |
| 963 | fail_conn: |
| 964 | return rv; |
| 965 | } |
| 966 | |
| 967 | int ngtcp2_conn_client_new(ngtcp2_conn **pconn, const ngtcp2_cid *dcid, |
| 968 | const ngtcp2_cid *scid, const ngtcp2_path *path, |
| 969 | uint32_t version, const ngtcp2_callbacks *callbacks, |
| 970 | const ngtcp2_settings *settings, |
| 971 | const ngtcp2_transport_params *params, |
| 972 | const ngtcp2_mem *mem, void *user_data) { |
| 973 | int rv; |
| 974 | rv = conn_new(pconn, dcid, scid, path, version, callbacks, settings, params, |
| 975 | mem, user_data, 0); |
| 976 | if (rv != 0) { |
| 977 | return rv; |
| 978 | } |
| 979 | (*pconn)->rcid = *dcid; |
| 980 | (*pconn)->state = NGTCP2_CS_CLIENT_INITIAL; |
| 981 | (*pconn)->local.bidi.next_stream_id = 0; |
| 982 | (*pconn)->local.uni.next_stream_id = 2; |
| 983 | |
| 984 | rv = ngtcp2_conn_commit_local_transport_params(*pconn); |
| 985 | if (rv != 0) { |
| 986 | ngtcp2_conn_del(*pconn); |
| 987 | return rv; |
| 988 | } |
| 989 | |
| 990 | return 0; |
| 991 | } |
| 992 | |
| 993 | int ngtcp2_conn_server_new(ngtcp2_conn **pconn, const ngtcp2_cid *dcid, |
| 994 | const ngtcp2_cid *scid, const ngtcp2_path *path, |
| 995 | uint32_t version, const ngtcp2_callbacks *callbacks, |
| 996 | const ngtcp2_settings *settings, |
| 997 | const ngtcp2_transport_params *params, |
| 998 | const ngtcp2_mem *mem, void *user_data) { |
| 999 | int rv; |
| 1000 | rv = conn_new(pconn, dcid, scid, path, version, callbacks, settings, params, |
| 1001 | mem, user_data, 1); |
| 1002 | if (rv != 0) { |
| 1003 | return rv; |
| 1004 | } |
| 1005 | (*pconn)->state = NGTCP2_CS_SERVER_INITIAL; |
| 1006 | (*pconn)->local.bidi.next_stream_id = 1; |
| 1007 | (*pconn)->local.uni.next_stream_id = 3; |
| 1008 | |
| 1009 | if ((*pconn)->local.settings.token.len) { |
| 1010 | /* Usage of token lifts amplification limit */ |
| 1011 | (*pconn)->dcid.current.flags |= NGTCP2_DCID_FLAG_PATH_VALIDATED0x01; |
| 1012 | } |
| 1013 | |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | /* |
| 1018 | * conn_fc_credits returns the number of bytes allowed to be sent to |
| 1019 | * the given stream. Both connection and stream level flow control |
| 1020 | * credits are considered. |
| 1021 | */ |
| 1022 | static uint64_t conn_fc_credits(ngtcp2_conn *conn, ngtcp2_strm *strm) { |
| 1023 | return ngtcp2_min(strm->tx.max_offset - strm->tx.offset,((strm->tx.max_offset - strm->tx.offset) < (conn-> tx.max_offset - conn->tx.offset) ? (strm->tx.max_offset - strm->tx.offset) : (conn->tx.max_offset - conn->tx .offset)) |
| 1024 | conn->tx.max_offset - conn->tx.offset)((strm->tx.max_offset - strm->tx.offset) < (conn-> tx.max_offset - conn->tx.offset) ? (strm->tx.max_offset - strm->tx.offset) : (conn->tx.max_offset - conn->tx .offset)); |
| 1025 | } |
| 1026 | |
| 1027 | /* |
| 1028 | * conn_enforce_flow_control returns the number of bytes allowed to be |
| 1029 | * sent to the given stream. |len| might be shorted because of |
| 1030 | * available flow control credits. |
| 1031 | */ |
| 1032 | static size_t conn_enforce_flow_control(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 1033 | size_t len) { |
| 1034 | uint64_t fc_credits = conn_fc_credits(conn, strm); |
| 1035 | return (size_t)ngtcp2_min((uint64_t)len, fc_credits)(((uint64_t)len) < (fc_credits) ? ((uint64_t)len) : (fc_credits )); |
| 1036 | } |
| 1037 | |
| 1038 | static int delete_strms_each(ngtcp2_map_entry *ent, void *ptr) { |
| 1039 | const ngtcp2_mem *mem = ptr; |
| 1040 | ngtcp2_strm *s = ngtcp2_struct_of(ent, ngtcp2_strm, me)((ngtcp2_strm *)(void *)((char *)(ent)-__builtin_offsetof(ngtcp2_strm , me))); |
| 1041 | |
| 1042 | ngtcp2_strm_free(s); |
| 1043 | ngtcp2_mem_free(mem, s); |
| 1044 | |
| 1045 | return 0; |
| 1046 | } |
| 1047 | |
| 1048 | void ngtcp2_conn_del(ngtcp2_conn *conn) { |
| 1049 | if (conn == NULL((void*)0)) { |
| 1050 | return; |
| 1051 | } |
| 1052 | |
| 1053 | ngtcp2_qlog_end(&conn->qlog); |
| 1054 | |
| 1055 | if (conn->early.ckm) { |
| 1056 | conn_call_delete_crypto_aead_ctx(conn, &conn->early.ckm->aead_ctx); |
| 1057 | } |
| 1058 | conn_call_delete_crypto_cipher_ctx(conn, &conn->early.hp_ctx); |
| 1059 | |
| 1060 | if (conn->crypto.key_update.old_rx_ckm) { |
| 1061 | conn_call_delete_crypto_aead_ctx( |
| 1062 | conn, &conn->crypto.key_update.old_rx_ckm->aead_ctx); |
| 1063 | } |
| 1064 | if (conn->crypto.key_update.new_rx_ckm) { |
| 1065 | conn_call_delete_crypto_aead_ctx( |
| 1066 | conn, &conn->crypto.key_update.new_rx_ckm->aead_ctx); |
| 1067 | } |
| 1068 | if (conn->crypto.key_update.new_tx_ckm) { |
| 1069 | conn_call_delete_crypto_aead_ctx( |
| 1070 | conn, &conn->crypto.key_update.new_tx_ckm->aead_ctx); |
| 1071 | } |
| 1072 | |
| 1073 | if (conn->pktns.crypto.rx.ckm) { |
| 1074 | conn_call_delete_crypto_aead_ctx(conn, |
| 1075 | &conn->pktns.crypto.rx.ckm->aead_ctx); |
| 1076 | } |
| 1077 | conn_call_delete_crypto_cipher_ctx(conn, &conn->pktns.crypto.rx.hp_ctx); |
| 1078 | |
| 1079 | if (conn->pktns.crypto.tx.ckm) { |
| 1080 | conn_call_delete_crypto_aead_ctx(conn, |
| 1081 | &conn->pktns.crypto.tx.ckm->aead_ctx); |
| 1082 | } |
| 1083 | conn_call_delete_crypto_cipher_ctx(conn, &conn->pktns.crypto.tx.hp_ctx); |
| 1084 | |
| 1085 | if (conn->hs_pktns) { |
| 1086 | if (conn->hs_pktns->crypto.rx.ckm) { |
| 1087 | conn_call_delete_crypto_aead_ctx( |
| 1088 | conn, &conn->hs_pktns->crypto.rx.ckm->aead_ctx); |
| 1089 | } |
| 1090 | conn_call_delete_crypto_cipher_ctx(conn, &conn->hs_pktns->crypto.rx.hp_ctx); |
| 1091 | |
| 1092 | if (conn->hs_pktns->crypto.tx.ckm) { |
| 1093 | conn_call_delete_crypto_aead_ctx( |
| 1094 | conn, &conn->hs_pktns->crypto.tx.ckm->aead_ctx); |
| 1095 | } |
| 1096 | conn_call_delete_crypto_cipher_ctx(conn, &conn->hs_pktns->crypto.tx.hp_ctx); |
| 1097 | } |
| 1098 | if (conn->in_pktns) { |
| 1099 | if (conn->in_pktns->crypto.rx.ckm) { |
| 1100 | conn_call_delete_crypto_aead_ctx( |
| 1101 | conn, &conn->in_pktns->crypto.rx.ckm->aead_ctx); |
| 1102 | } |
| 1103 | conn_call_delete_crypto_cipher_ctx(conn, &conn->in_pktns->crypto.rx.hp_ctx); |
| 1104 | |
| 1105 | if (conn->in_pktns->crypto.tx.ckm) { |
| 1106 | conn_call_delete_crypto_aead_ctx( |
| 1107 | conn, &conn->in_pktns->crypto.tx.ckm->aead_ctx); |
| 1108 | } |
| 1109 | conn_call_delete_crypto_cipher_ctx(conn, &conn->in_pktns->crypto.tx.hp_ctx); |
| 1110 | } |
| 1111 | |
| 1112 | conn_call_delete_crypto_aead_ctx(conn, &conn->crypto.retry_aead_ctx); |
| 1113 | |
| 1114 | ngtcp2_mem_free(conn->mem, conn->crypto.decrypt_buf.base); |
| 1115 | ngtcp2_mem_free(conn->mem, conn->crypto.decrypt_hp_buf.base); |
| 1116 | ngtcp2_mem_free(conn->mem, conn->local.settings.token.base); |
| 1117 | |
| 1118 | ngtcp2_crypto_km_del(conn->crypto.key_update.old_rx_ckm, conn->mem); |
| 1119 | ngtcp2_crypto_km_del(conn->crypto.key_update.new_rx_ckm, conn->mem); |
| 1120 | ngtcp2_crypto_km_del(conn->crypto.key_update.new_tx_ckm, conn->mem); |
| 1121 | ngtcp2_crypto_km_del(conn->early.ckm, conn->mem); |
| 1122 | |
| 1123 | pktns_free(&conn->pktns, conn->mem); |
| 1124 | pktns_del(conn->hs_pktns, conn->mem); |
| 1125 | pktns_del(conn->in_pktns, conn->mem); |
| 1126 | |
| 1127 | cc_del(&conn->cc, conn->cc_algo, conn->mem); |
| 1128 | |
| 1129 | ngtcp2_mem_free(conn->mem, conn->qlog.buf.begin); |
| 1130 | |
| 1131 | ngtcp2_ringbuf_free(&conn->rx.path_challenge); |
| 1132 | |
| 1133 | ngtcp2_pv_del(conn->pv); |
| 1134 | |
| 1135 | ngtcp2_idtr_free(&conn->remote.uni.idtr); |
| 1136 | ngtcp2_idtr_free(&conn->remote.bidi.idtr); |
| 1137 | ngtcp2_mem_free(conn->mem, conn->tx.ack); |
| 1138 | ngtcp2_pq_free(&conn->tx.strmq); |
| 1139 | ngtcp2_map_each_free(&conn->strms, delete_strms_each, (void *)conn->mem); |
| 1140 | ngtcp2_map_free(&conn->strms); |
| 1141 | |
| 1142 | ngtcp2_pq_free(&conn->scid.used); |
| 1143 | delete_scid(&conn->scid.set, conn->mem); |
| 1144 | ngtcp2_ksl_free(&conn->scid.set); |
| 1145 | ngtcp2_gaptr_free(&conn->dcid.seqgap); |
| 1146 | ngtcp2_ringbuf_free(&conn->dcid.retired); |
| 1147 | ngtcp2_ringbuf_free(&conn->dcid.unused); |
| 1148 | ngtcp2_ringbuf_free(&conn->dcid.bound); |
| 1149 | |
| 1150 | ngtcp2_mem_free(conn->mem, conn); |
| 1151 | } |
| 1152 | |
| 1153 | /* |
| 1154 | * conn_ensure_ack_blks makes sure that conn->tx.ack->ack.blks can |
| 1155 | * contain at least |n| additional ngtcp2_ack_blk. |
| 1156 | * |
| 1157 | * This function returns 0 if it succeeds, or one of the following |
| 1158 | * negative error codes: |
| 1159 | * |
| 1160 | * NGTCP2_ERR_NOMEM |
| 1161 | * Out of memory. |
| 1162 | */ |
| 1163 | static int conn_ensure_ack_blks(ngtcp2_conn *conn, size_t n) { |
| 1164 | ngtcp2_frame *fr; |
| 1165 | size_t max = conn->tx.max_ack_blks; |
| 1166 | |
| 1167 | if (n <= max) { |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
| 1171 | max *= 2; |
| 1172 | |
| 1173 | assert(max >= n)((void) (0)); |
| 1174 | |
| 1175 | fr = ngtcp2_mem_realloc(conn->mem, conn->tx.ack, |
| 1176 | sizeof(ngtcp2_ack) + sizeof(ngtcp2_ack_blk) * max); |
| 1177 | if (fr == NULL((void*)0)) { |
| 1178 | return NGTCP2_ERR_NOMEM-501; |
| 1179 | } |
| 1180 | |
| 1181 | conn->tx.ack = fr; |
| 1182 | conn->tx.max_ack_blks = max; |
| 1183 | |
| 1184 | return 0; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * conn_compute_ack_delay computes ACK delay for outgoing protected |
| 1189 | * ACK. |
| 1190 | */ |
| 1191 | static ngtcp2_duration conn_compute_ack_delay(ngtcp2_conn *conn) { |
| 1192 | return ngtcp2_min(conn->local.transport_params.max_ack_delay,((conn->local.transport_params.max_ack_delay) < (conn-> cstat.smoothed_rtt / 8) ? (conn->local.transport_params.max_ack_delay ) : (conn->cstat.smoothed_rtt / 8)) |
| 1193 | conn->cstat.smoothed_rtt / 8)((conn->local.transport_params.max_ack_delay) < (conn-> cstat.smoothed_rtt / 8) ? (conn->local.transport_params.max_ack_delay ) : (conn->cstat.smoothed_rtt / 8)); |
| 1194 | } |
| 1195 | |
| 1196 | /* |
| 1197 | * conn_create_ack_frame creates ACK frame, and assigns its pointer to |
| 1198 | * |*pfr| if there are any received packets to acknowledge. If there |
| 1199 | * are no packets to acknowledge, this function returns 0, and |*pfr| |
| 1200 | * is untouched. The caller is advised to set |*pfr| to NULL before |
| 1201 | * calling this function, and check it after this function returns. |
| 1202 | * If |nodelay| is nonzero, delayed ACK timer is ignored. |
| 1203 | * |
| 1204 | * The memory for ACK frame is dynamically allocated by this function. |
| 1205 | * A caller is responsible to free it. |
| 1206 | * |
| 1207 | * Call ngtcp2_acktr_commit_ack after a created ACK frame is |
| 1208 | * successfully serialized into a packet. |
| 1209 | * |
| 1210 | * This function returns 0 if it succeeds, or one of the following |
| 1211 | * negative error codes: |
| 1212 | * |
| 1213 | * NGTCP2_ERR_NOMEM |
| 1214 | * Out of memory. |
| 1215 | */ |
| 1216 | static int conn_create_ack_frame(ngtcp2_conn *conn, ngtcp2_frame **pfr, |
| 1217 | ngtcp2_pktns *pktns, uint8_t type, |
| 1218 | ngtcp2_tstamp ts, ngtcp2_duration ack_delay, |
| 1219 | uint64_t ack_delay_exponent) { |
| 1220 | /* TODO Measure an actual size of ACK blocks to find the best |
| 1221 | default value. */ |
| 1222 | const size_t initial_max_ack_blks = 8; |
| 1223 | int64_t last_pkt_num; |
| 1224 | ngtcp2_acktr *acktr = &pktns->acktr; |
| 1225 | ngtcp2_ack_blk *blk; |
| 1226 | ngtcp2_ksl_it it; |
| 1227 | ngtcp2_acktr_entry *rpkt; |
| 1228 | ngtcp2_ack *ack; |
| 1229 | size_t blk_idx; |
| 1230 | ngtcp2_tstamp largest_ack_ts; |
| 1231 | int rv; |
| 1232 | |
| 1233 | if (acktr->flags & NGTCP2_ACKTR_FLAG_IMMEDIATE_ACK0x01) { |
| 1234 | ack_delay = 0; |
| 1235 | } |
| 1236 | |
| 1237 | if (!ngtcp2_acktr_require_active_ack(acktr, ack_delay, ts)) { |
| 1238 | return 0; |
| 1239 | } |
| 1240 | |
| 1241 | it = ngtcp2_acktr_get(acktr); |
| 1242 | if (ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0))) { |
| 1243 | ngtcp2_acktr_commit_ack(acktr); |
| 1244 | return 0; |
| 1245 | } |
| 1246 | |
| 1247 | if (conn->tx.ack == NULL((void*)0)) { |
| 1248 | conn->tx.ack = ngtcp2_mem_malloc( |
| 1249 | conn->mem, |
| 1250 | sizeof(ngtcp2_ack) + sizeof(ngtcp2_ack_blk) * initial_max_ack_blks); |
| 1251 | if (conn->tx.ack == NULL((void*)0)) { |
| 1252 | return NGTCP2_ERR_NOMEM-501; |
| 1253 | } |
| 1254 | conn->tx.max_ack_blks = initial_max_ack_blks; |
| 1255 | } |
| 1256 | |
| 1257 | ack = &conn->tx.ack->ack; |
| 1258 | |
| 1259 | if (pktns->rx.ecn.ect0 || pktns->rx.ecn.ect1 || pktns->rx.ecn.ce) { |
| 1260 | ack->type = NGTCP2_FRAME_ACK_ECN; |
| 1261 | ack->ecn.ect0 = pktns->rx.ecn.ect0; |
| 1262 | ack->ecn.ect1 = pktns->rx.ecn.ect1; |
| 1263 | ack->ecn.ce = pktns->rx.ecn.ce; |
| 1264 | } else { |
| 1265 | ack->type = NGTCP2_FRAME_ACK; |
| 1266 | } |
| 1267 | ack->num_blks = 0; |
| 1268 | |
| 1269 | rpkt = ngtcp2_ksl_it_get(&it); |
| 1270 | |
| 1271 | if (rpkt->pkt_num == pktns->rx.max_pkt_num) { |
| 1272 | last_pkt_num = rpkt->pkt_num - (int64_t)(rpkt->len - 1); |
| 1273 | largest_ack_ts = rpkt->tstamp; |
| 1274 | ack->largest_ack = rpkt->pkt_num; |
| 1275 | ack->first_ack_blklen = rpkt->len - 1; |
| 1276 | |
| 1277 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0); |
| 1278 | } else { |
| 1279 | assert(rpkt->pkt_num < pktns->rx.max_pkt_num)((void) (0)); |
| 1280 | |
| 1281 | last_pkt_num = pktns->rx.max_pkt_num; |
| 1282 | largest_ack_ts = pktns->rx.max_pkt_ts; |
| 1283 | ack->largest_ack = pktns->rx.max_pkt_num; |
| 1284 | ack->first_ack_blklen = 0; |
| 1285 | } |
| 1286 | |
| 1287 | if (type == NGTCP2_PKT_SHORT) { |
| 1288 | ack->ack_delay_unscaled = ts - largest_ack_ts; |
| 1289 | ack->ack_delay = ack->ack_delay_unscaled / NGTCP2_MICROSECONDS((uint64_t)1000ULL) / |
| 1290 | (1ULL << ack_delay_exponent); |
| 1291 | } else { |
| 1292 | ack->ack_delay_unscaled = 0; |
| 1293 | ack->ack_delay = 0; |
| 1294 | } |
| 1295 | |
| 1296 | for (; !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 1297 | if (ack->num_blks == NGTCP2_MAX_ACK_BLKS32) { |
| 1298 | break; |
| 1299 | } |
| 1300 | |
| 1301 | rpkt = ngtcp2_ksl_it_get(&it); |
| 1302 | |
| 1303 | blk_idx = ack->num_blks++; |
| 1304 | rv = conn_ensure_ack_blks(conn, ack->num_blks); |
| 1305 | if (rv != 0) { |
| 1306 | return rv; |
| 1307 | } |
| 1308 | ack = &conn->tx.ack->ack; |
| 1309 | blk = &ack->blks[blk_idx]; |
| 1310 | blk->gap = (uint64_t)(last_pkt_num - rpkt->pkt_num - 2); |
| 1311 | blk->blklen = rpkt->len - 1; |
| 1312 | |
| 1313 | last_pkt_num = rpkt->pkt_num - (int64_t)(rpkt->len - 1); |
| 1314 | } |
| 1315 | |
| 1316 | /* TODO Just remove entries which cannot fit into a single ACK frame |
| 1317 | for now. */ |
| 1318 | if (!ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0))) { |
| 1319 | ngtcp2_acktr_forget(acktr, ngtcp2_ksl_it_get(&it)); |
| 1320 | } |
| 1321 | |
| 1322 | *pfr = conn->tx.ack; |
| 1323 | |
| 1324 | return 0; |
| 1325 | } |
| 1326 | |
| 1327 | /* |
| 1328 | * conn_ppe_write_frame writes |fr| to |ppe|. If |hd_logged| is not |
| 1329 | * NULL and |*hd_logged| is zero, packet header is logged, and 1 is |
| 1330 | * assigned to |*hd_logged|. |
| 1331 | * |
| 1332 | * This function returns 0 if it succeeds, or one of the following |
| 1333 | * negative error codes: |
| 1334 | * |
| 1335 | * NGTCP2_ERR_NOBUF |
| 1336 | * Buffer is too small. |
| 1337 | */ |
| 1338 | static int conn_ppe_write_frame_hd_log(ngtcp2_conn *conn, ngtcp2_ppe *ppe, |
| 1339 | int *hd_logged, const ngtcp2_pkt_hd *hd, |
| 1340 | ngtcp2_frame *fr) { |
| 1341 | int rv; |
| 1342 | |
| 1343 | rv = ngtcp2_ppe_encode_frame(ppe, fr); |
| 1344 | if (rv != 0) { |
| 1345 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 1346 | return rv; |
| 1347 | } |
| 1348 | |
| 1349 | if (hd_logged && !*hd_logged) { |
| 1350 | *hd_logged = 1; |
| 1351 | ngtcp2_log_tx_pkt_hd(&conn->log, hd); |
| 1352 | ngtcp2_qlog_pkt_sent_start(&conn->qlog); |
| 1353 | } |
| 1354 | |
| 1355 | ngtcp2_log_tx_fr(&conn->log, hd, fr); |
| 1356 | ngtcp2_qlog_write_frame(&conn->qlog, fr); |
| 1357 | |
| 1358 | return 0; |
| 1359 | } |
| 1360 | |
| 1361 | /* |
| 1362 | * conn_ppe_write_frame writes |fr| to |ppe|. |
| 1363 | * |
| 1364 | * This function returns 0 if it succeeds, or one of the following |
| 1365 | * negative error codes: |
| 1366 | * |
| 1367 | * NGTCP2_ERR_NOBUF |
| 1368 | * Buffer is too small. |
| 1369 | */ |
| 1370 | static int conn_ppe_write_frame(ngtcp2_conn *conn, ngtcp2_ppe *ppe, |
| 1371 | const ngtcp2_pkt_hd *hd, ngtcp2_frame *fr) { |
| 1372 | return conn_ppe_write_frame_hd_log(conn, ppe, NULL((void*)0), hd, fr); |
| 1373 | } |
| 1374 | |
| 1375 | /* |
| 1376 | * conn_on_pkt_sent is called when new non-ACK-only packet is sent. |
| 1377 | * |
| 1378 | * This function returns 0 if it succeeds, or one of the following |
| 1379 | * negative error codes: |
| 1380 | * |
| 1381 | * NGTCP2_ERR_NOMEM |
| 1382 | * Out of memory |
| 1383 | */ |
| 1384 | static int conn_on_pkt_sent(ngtcp2_conn *conn, ngtcp2_rtb *rtb, |
| 1385 | ngtcp2_rtb_entry *ent) { |
| 1386 | int rv; |
| 1387 | |
| 1388 | /* This function implements OnPacketSent, but it handles only |
| 1389 | non-ACK-only packet. */ |
| 1390 | rv = ngtcp2_rtb_add(rtb, ent, &conn->cstat); |
| 1391 | if (rv != 0) { |
| 1392 | return rv; |
| 1393 | } |
| 1394 | |
| 1395 | if (ent->flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) { |
| 1396 | conn->cstat.last_tx_pkt_ts[rtb->pktns_id] = ent->ts; |
| 1397 | } |
| 1398 | |
| 1399 | ngtcp2_conn_set_loss_detection_timer(conn, ent->ts); |
| 1400 | |
| 1401 | return 0; |
| 1402 | } |
| 1403 | |
| 1404 | /* |
| 1405 | * pktns_select_pkt_numlen selects shortest packet number encoding for |
| 1406 | * the next packet number based on the largest acknowledged packet |
| 1407 | * number. It returns the number of bytes to encode the packet |
| 1408 | * number. |
| 1409 | */ |
| 1410 | static size_t pktns_select_pkt_numlen(ngtcp2_pktns *pktns) { |
| 1411 | int64_t pkt_num = pktns->tx.last_pkt_num + 1; |
| 1412 | ngtcp2_rtb *rtb = &pktns->rtb; |
| 1413 | int64_t n = pkt_num - rtb->largest_acked_tx_pkt_num; |
| 1414 | |
| 1415 | if (NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1)) / 2 <= pkt_num) { |
| 1416 | return 4; |
| 1417 | } |
| 1418 | |
| 1419 | n = n * 2 + 1; |
| 1420 | |
| 1421 | if (n > 0xffffff) { |
| 1422 | return 4; |
| 1423 | } |
| 1424 | if (n > 0xffff) { |
| 1425 | return 3; |
| 1426 | } |
| 1427 | if (n > 0xff) { |
| 1428 | return 2; |
| 1429 | } |
| 1430 | return 1; |
| 1431 | } |
| 1432 | |
| 1433 | /* |
| 1434 | * conn_cwnd_is_zero returns nonzero if the number of bytes the local |
| 1435 | * endpoint can sent at this time is zero. |
| 1436 | */ |
| 1437 | static uint64_t conn_cwnd_is_zero(ngtcp2_conn *conn) { |
| 1438 | uint64_t bytes_in_flight = conn->cstat.bytes_in_flight; |
| 1439 | uint64_t cwnd = |
| 1440 | conn->pv && (conn->pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) |
| 1441 | ? ngtcp2_cc_compute_initcwnd(conn->cstat.max_udp_payload_size) |
| 1442 | : conn->cstat.cwnd; |
| 1443 | |
| 1444 | return bytes_in_flight >= cwnd; |
| 1445 | } |
| 1446 | |
| 1447 | /* |
| 1448 | * conn_retry_early_payloadlen returns the estimated wire length of |
| 1449 | * the first STREAM frame of 0-RTT packet which should be |
| 1450 | * retransmitted due to Retry frame |
| 1451 | */ |
| 1452 | static size_t conn_retry_early_payloadlen(ngtcp2_conn *conn) { |
| 1453 | ngtcp2_frame_chain *frc; |
| 1454 | ngtcp2_strm *strm; |
| 1455 | |
| 1456 | if (conn->flags & NGTCP2_CONN_FLAG_EARLY_DATA_REJECTED0x20) { |
| 1457 | return 0; |
| 1458 | } |
| 1459 | |
| 1460 | for (; !ngtcp2_pq_empty(&conn->tx.strmq);) { |
| 1461 | strm = ngtcp2_conn_tx_strmq_top(conn); |
| 1462 | if (ngtcp2_strm_streamfrq_empty(strm)) { |
| 1463 | ngtcp2_conn_tx_strmq_pop(conn); |
| 1464 | continue; |
| 1465 | } |
| 1466 | |
| 1467 | frc = ngtcp2_strm_streamfrq_top(strm); |
| 1468 | return ngtcp2_vec_len(frc->fr.stream.data, frc->fr.stream.datacnt) + |
| 1469 | NGTCP2_STREAM_OVERHEAD(1 + 8 + 8 + 8); |
| 1470 | } |
| 1471 | |
| 1472 | return 0; |
| 1473 | } |
| 1474 | |
| 1475 | static void conn_cryptofrq_clear(ngtcp2_conn *conn, ngtcp2_pktns *pktns) { |
| 1476 | ngtcp2_frame_chain *frc; |
| 1477 | ngtcp2_ksl_it it; |
| 1478 | |
| 1479 | for (it = ngtcp2_ksl_begin(&pktns->crypto.tx.frq); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 1480 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 1481 | frc = ngtcp2_ksl_it_get(&it); |
| 1482 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1483 | } |
| 1484 | ngtcp2_ksl_clear(&pktns->crypto.tx.frq); |
| 1485 | } |
| 1486 | |
| 1487 | /* |
| 1488 | * conn_cryptofrq_unacked_offset returns the CRYPTO frame offset by |
| 1489 | * taking into account acknowledged offset. If there is no data to |
| 1490 | * send, this function returns (uint64_t)-1. |
| 1491 | */ |
| 1492 | static uint64_t conn_cryptofrq_unacked_offset(ngtcp2_conn *conn, |
| 1493 | ngtcp2_pktns *pktns) { |
| 1494 | ngtcp2_frame_chain *frc; |
| 1495 | ngtcp2_crypto *fr; |
| 1496 | ngtcp2_range gap; |
| 1497 | ngtcp2_rtb *rtb = &pktns->rtb; |
| 1498 | ngtcp2_ksl_it it; |
| 1499 | size_t datalen; |
| 1500 | |
| 1501 | (void)conn; |
| 1502 | |
| 1503 | for (it = ngtcp2_ksl_begin(&pktns->crypto.tx.frq); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 1504 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 1505 | frc = ngtcp2_ksl_it_get(&it); |
| 1506 | fr = &frc->fr.crypto; |
| 1507 | |
| 1508 | gap = ngtcp2_strm_get_unacked_range_after(rtb->crypto, fr->offset); |
| 1509 | |
| 1510 | datalen = ngtcp2_vec_len(fr->data, fr->datacnt); |
| 1511 | |
| 1512 | if (gap.begin <= fr->offset) { |
| 1513 | return fr->offset; |
| 1514 | } |
| 1515 | if (gap.begin < fr->offset + datalen) { |
| 1516 | return gap.begin; |
| 1517 | } |
| 1518 | } |
| 1519 | |
| 1520 | return (uint64_t)-1; |
| 1521 | } |
| 1522 | |
| 1523 | static int conn_cryptofrq_unacked_pop(ngtcp2_conn *conn, ngtcp2_pktns *pktns, |
| 1524 | ngtcp2_frame_chain **pfrc) { |
| 1525 | ngtcp2_frame_chain *frc, *nfrc; |
| 1526 | ngtcp2_crypto *fr, *nfr; |
| 1527 | uint64_t offset, end_offset; |
| 1528 | size_t idx, end_idx; |
| 1529 | uint64_t base_offset, end_base_offset; |
| 1530 | ngtcp2_range gap; |
| 1531 | ngtcp2_rtb *rtb = &pktns->rtb; |
| 1532 | ngtcp2_vec *v; |
| 1533 | int rv; |
| 1534 | ngtcp2_ksl_it it; |
| 1535 | |
| 1536 | *pfrc = NULL((void*)0); |
| 1537 | |
| 1538 | for (it = ngtcp2_ksl_begin(&pktns->crypto.tx.frq); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0));) { |
| 1539 | frc = ngtcp2_ksl_it_get(&it); |
| 1540 | fr = &frc->fr.crypto; |
| 1541 | |
| 1542 | ngtcp2_ksl_remove(&pktns->crypto.tx.frq, &it, &fr->offset); |
| 1543 | |
| 1544 | idx = 0; |
| 1545 | offset = fr->offset; |
| 1546 | base_offset = 0; |
| 1547 | |
| 1548 | gap = ngtcp2_strm_get_unacked_range_after(rtb->crypto, offset); |
| 1549 | if (gap.begin < offset) { |
| 1550 | gap.begin = offset; |
| 1551 | } |
| 1552 | |
| 1553 | for (; idx < fr->datacnt && offset < gap.begin; ++idx) { |
| 1554 | v = &fr->data[idx]; |
| 1555 | if (offset + v->len > gap.begin) { |
| 1556 | base_offset = gap.begin - offset; |
| 1557 | break; |
| 1558 | } |
| 1559 | |
| 1560 | offset += v->len; |
| 1561 | } |
| 1562 | |
| 1563 | if (idx == fr->datacnt) { |
| 1564 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1565 | continue; |
| 1566 | } |
| 1567 | |
| 1568 | assert(gap.begin == offset + base_offset)((void) (0)); |
| 1569 | |
| 1570 | end_idx = idx; |
| 1571 | end_offset = offset; |
| 1572 | end_base_offset = 0; |
| 1573 | |
| 1574 | for (; end_idx < fr->datacnt; ++end_idx) { |
| 1575 | v = &fr->data[end_idx]; |
| 1576 | if (end_offset + v->len > gap.end) { |
| 1577 | end_base_offset = gap.end - end_offset; |
| 1578 | break; |
| 1579 | } |
| 1580 | |
| 1581 | end_offset += v->len; |
| 1582 | } |
| 1583 | |
| 1584 | if (fr->offset == offset && base_offset == 0 && fr->datacnt == end_idx) { |
| 1585 | *pfrc = frc; |
| 1586 | return 0; |
| 1587 | } |
| 1588 | |
| 1589 | if (fr->datacnt == end_idx) { |
| 1590 | memmove(fr->data, fr->data + idx, sizeof(fr->data[0]) * (end_idx - idx)); |
| 1591 | |
| 1592 | assert(fr->data[0].len > base_offset)((void) (0)); |
| 1593 | |
| 1594 | fr->offset = offset + base_offset; |
| 1595 | fr->datacnt = end_idx - idx; |
| 1596 | fr->data[0].base += base_offset; |
| 1597 | fr->data[0].len -= (size_t)base_offset; |
| 1598 | |
| 1599 | *pfrc = frc; |
| 1600 | return 0; |
| 1601 | } |
| 1602 | |
| 1603 | rv = ngtcp2_frame_chain_crypto_datacnt_new(&nfrc, fr->datacnt - end_idx, |
| 1604 | conn->mem); |
| 1605 | if (rv != 0) { |
| 1606 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1607 | return rv; |
| 1608 | } |
| 1609 | |
| 1610 | nfr = &nfrc->fr.crypto; |
| 1611 | nfr->type = NGTCP2_FRAME_CRYPTO; |
| 1612 | memcpy(nfr->data, fr->data + end_idx, |
| 1613 | sizeof(nfr->data[0]) * (fr->datacnt - end_idx)); |
| 1614 | |
| 1615 | assert(nfr->data[0].len > end_base_offset)((void) (0)); |
| 1616 | |
| 1617 | nfr->offset = end_offset + end_base_offset; |
| 1618 | nfr->datacnt = fr->datacnt - end_idx; |
| 1619 | nfr->data[0].base += end_base_offset; |
| 1620 | nfr->data[0].len -= (size_t)end_base_offset; |
| 1621 | |
| 1622 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), &nfr->offset, nfrc); |
| 1623 | if (rv != 0) { |
| 1624 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1625 | ngtcp2_frame_chain_del(nfrc, conn->mem); |
| 1626 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1627 | return rv; |
| 1628 | } |
| 1629 | |
| 1630 | if (end_base_offset) { |
| 1631 | ++end_idx; |
| 1632 | } |
| 1633 | |
| 1634 | memmove(fr->data, fr->data + idx, sizeof(fr->data[0]) * (end_idx - idx)); |
| 1635 | |
| 1636 | assert(fr->data[0].len > base_offset)((void) (0)); |
| 1637 | |
| 1638 | fr->offset = offset + base_offset; |
| 1639 | fr->datacnt = end_idx - idx; |
| 1640 | if (end_base_offset) { |
| 1641 | assert(fr->data[fr->datacnt - 1].len > end_base_offset)((void) (0)); |
| 1642 | fr->data[fr->datacnt - 1].len = (size_t)end_base_offset; |
| 1643 | } |
| 1644 | fr->data[0].base += base_offset; |
| 1645 | fr->data[0].len -= (size_t)base_offset; |
| 1646 | |
| 1647 | *pfrc = frc; |
| 1648 | return 0; |
| 1649 | } |
| 1650 | |
| 1651 | return 0; |
| 1652 | } |
| 1653 | static int conn_cryptofrq_pop(ngtcp2_conn *conn, ngtcp2_frame_chain **pfrc, |
| 1654 | ngtcp2_pktns *pktns, size_t left) { |
| 1655 | ngtcp2_crypto *fr, *nfr; |
| 1656 | ngtcp2_frame_chain *frc, *nfrc; |
| 1657 | int rv; |
| 1658 | size_t nmerged; |
| 1659 | size_t datalen; |
| 1660 | ngtcp2_vec a[NGTCP2_MAX_CRYPTO_DATACNT8]; |
| 1661 | ngtcp2_vec b[NGTCP2_MAX_CRYPTO_DATACNT8]; |
| 1662 | size_t acnt, bcnt; |
| 1663 | ngtcp2_ksl_it it; |
| 1664 | |
| 1665 | rv = conn_cryptofrq_unacked_pop(conn, pktns, &frc); |
| 1666 | if (rv != 0) { |
| 1667 | return rv; |
| 1668 | } |
| 1669 | if (frc == NULL((void*)0)) { |
| 1670 | *pfrc = NULL((void*)0); |
| 1671 | return 0; |
| 1672 | } |
| 1673 | |
| 1674 | fr = &frc->fr.crypto; |
| 1675 | datalen = ngtcp2_vec_len(fr->data, fr->datacnt); |
| 1676 | |
| 1677 | if (datalen > left) { |
| 1678 | ngtcp2_vec_copy(a, fr->data, fr->datacnt); |
| 1679 | acnt = fr->datacnt; |
| 1680 | |
| 1681 | bcnt = 0; |
| 1682 | ngtcp2_vec_split(a, &acnt, b, &bcnt, left, NGTCP2_MAX_CRYPTO_DATACNT8); |
| 1683 | |
| 1684 | assert(acnt > 0)((void) (0)); |
| 1685 | assert(bcnt > 0)((void) (0)); |
| 1686 | |
| 1687 | rv = ngtcp2_frame_chain_crypto_datacnt_new(&nfrc, bcnt, conn->mem); |
| 1688 | if (rv != 0) { |
| 1689 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1690 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1691 | return rv; |
| 1692 | } |
| 1693 | |
| 1694 | nfr = &nfrc->fr.crypto; |
| 1695 | nfr->type = NGTCP2_FRAME_CRYPTO; |
| 1696 | nfr->offset = fr->offset + left; |
| 1697 | nfr->datacnt = bcnt; |
| 1698 | ngtcp2_vec_copy(nfr->data, b, bcnt); |
| 1699 | |
| 1700 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), &nfr->offset, nfrc); |
| 1701 | if (rv != 0) { |
| 1702 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1703 | ngtcp2_frame_chain_del(nfrc, conn->mem); |
| 1704 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1705 | return rv; |
| 1706 | } |
| 1707 | |
| 1708 | rv = ngtcp2_frame_chain_crypto_datacnt_new(&nfrc, acnt, conn->mem); |
| 1709 | if (rv != 0) { |
| 1710 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1711 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1712 | return rv; |
| 1713 | } |
| 1714 | |
| 1715 | nfr = &nfrc->fr.crypto; |
| 1716 | *nfr = *fr; |
| 1717 | nfr->datacnt = acnt; |
| 1718 | ngtcp2_vec_copy(nfr->data, a, acnt); |
| 1719 | |
| 1720 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1721 | |
| 1722 | *pfrc = nfrc; |
| 1723 | |
| 1724 | return 0; |
| 1725 | } |
| 1726 | |
| 1727 | left -= datalen; |
| 1728 | |
| 1729 | ngtcp2_vec_copy(a, fr->data, fr->datacnt); |
| 1730 | acnt = fr->datacnt; |
| 1731 | |
| 1732 | for (; left && ngtcp2_ksl_len(&pktns->crypto.tx.frq);) { |
| 1733 | it = ngtcp2_ksl_begin(&pktns->crypto.tx.frq); |
| 1734 | nfrc = ngtcp2_ksl_it_get(&it); |
| 1735 | nfr = &nfrc->fr.crypto; |
| 1736 | |
| 1737 | if (nfr->offset != fr->offset + datalen) { |
| 1738 | assert(fr->offset + datalen < nfr->offset)((void) (0)); |
| 1739 | break; |
| 1740 | } |
| 1741 | |
| 1742 | rv = conn_cryptofrq_unacked_pop(conn, pktns, &nfrc); |
| 1743 | if (rv != 0) { |
| 1744 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1745 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1746 | return rv; |
| 1747 | } |
| 1748 | if (nfrc == NULL((void*)0)) { |
| 1749 | break; |
| 1750 | } |
| 1751 | |
| 1752 | nfr = &nfrc->fr.crypto; |
| 1753 | |
| 1754 | nmerged = ngtcp2_vec_merge(a, &acnt, nfr->data, &nfr->datacnt, left, |
| 1755 | NGTCP2_MAX_CRYPTO_DATACNT8); |
| 1756 | if (nmerged == 0) { |
| 1757 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), &nfr->offset, nfrc); |
| 1758 | if (rv != 0) { |
| 1759 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 1760 | ngtcp2_frame_chain_del(nfrc, conn->mem); |
| 1761 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1762 | return rv; |
| 1763 | } |
| 1764 | break; |
| 1765 | } |
| 1766 | |
| 1767 | datalen += nmerged; |
| 1768 | left -= nmerged; |
| 1769 | |
| 1770 | if (nfr->datacnt == 0) { |
| 1771 | ngtcp2_frame_chain_del(nfrc, conn->mem); |
| 1772 | continue; |
| 1773 | } |
| 1774 | |
| 1775 | nfr->offset += nmerged; |
| 1776 | |
| 1777 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), &nfr->offset, nfrc); |
| 1778 | if (rv != 0) { |
| 1779 | ngtcp2_frame_chain_del(nfrc, conn->mem); |
| 1780 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1781 | return rv; |
| 1782 | } |
| 1783 | |
| 1784 | break; |
| 1785 | } |
| 1786 | |
| 1787 | if (acnt == fr->datacnt) { |
| 1788 | assert(acnt > 0)((void) (0)); |
| 1789 | fr->data[acnt - 1] = a[acnt - 1]; |
| 1790 | |
| 1791 | *pfrc = frc; |
| 1792 | return 0; |
| 1793 | } |
| 1794 | |
| 1795 | assert(acnt > fr->datacnt)((void) (0)); |
| 1796 | |
| 1797 | rv = ngtcp2_frame_chain_crypto_datacnt_new(&nfrc, acnt, conn->mem); |
| 1798 | if (rv != 0) { |
| 1799 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1800 | return rv; |
| 1801 | } |
| 1802 | |
| 1803 | nfr = &nfrc->fr.crypto; |
| 1804 | *nfr = *fr; |
| 1805 | nfr->datacnt = acnt; |
| 1806 | ngtcp2_vec_copy(nfr->data, a, acnt); |
| 1807 | |
| 1808 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 1809 | |
| 1810 | *pfrc = nfrc; |
| 1811 | |
| 1812 | return 0; |
| 1813 | } |
| 1814 | |
| 1815 | /* |
| 1816 | * conn_verify_dcid verifies that destination connection ID in |hd| is |
| 1817 | * valid for the connection. If it is successfully verified and the |
| 1818 | * remote endpoint uses new DCID in the packet, nonzero value is |
| 1819 | * assigned to |*pnew_cid_used| if it is not NULL. Otherwise 0 is |
| 1820 | * assigned to it. |
| 1821 | * |
| 1822 | * This function returns 0 if it succeeds, or one of the following |
| 1823 | * negative error codes: |
| 1824 | * |
| 1825 | * NGTCP2_ERR_NOMEM |
| 1826 | * Out of memory. |
| 1827 | * NGTCP2_ERR_INVALID_ARGUMENT |
| 1828 | * |dcid| is not known to the local endpoint. |
| 1829 | */ |
| 1830 | static int conn_verify_dcid(ngtcp2_conn *conn, int *pnew_cid_used, |
| 1831 | const ngtcp2_pkt_hd *hd) { |
| 1832 | ngtcp2_ksl_it it; |
| 1833 | ngtcp2_scid *scid; |
| 1834 | int rv; |
| 1835 | |
| 1836 | it = ngtcp2_ksl_lower_bound(&conn->scid.set, &hd->dcid); |
| 1837 | if (ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0))) { |
| 1838 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 1839 | } |
| 1840 | |
| 1841 | scid = ngtcp2_ksl_it_get(&it); |
| 1842 | if (!ngtcp2_cid_eq(&scid->cid, &hd->dcid)) { |
| 1843 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 1844 | } |
| 1845 | |
| 1846 | if (!(scid->flags & NGTCP2_SCID_FLAG_USED0x01)) { |
| 1847 | scid->flags |= NGTCP2_SCID_FLAG_USED0x01; |
| 1848 | |
| 1849 | if (scid->pe.index == NGTCP2_PQ_BAD_INDEX(18446744073709551615UL)) { |
| 1850 | rv = ngtcp2_pq_push(&conn->scid.used, &scid->pe); |
| 1851 | if (rv != 0) { |
| 1852 | return rv; |
| 1853 | } |
| 1854 | } |
| 1855 | |
| 1856 | if (pnew_cid_used) { |
| 1857 | *pnew_cid_used = 1; |
| 1858 | } |
| 1859 | } else if (pnew_cid_used) { |
| 1860 | *pnew_cid_used = 0; |
| 1861 | } |
| 1862 | |
| 1863 | return 0; |
| 1864 | } |
| 1865 | |
| 1866 | /* |
| 1867 | * conn_should_pad_pkt returns nonzero if the packet should be padded. |
| 1868 | * |type| is the type of packet. |left| is the space left in packet |
| 1869 | * buffer. |early_datalen| is the number of bytes which will be sent |
| 1870 | * in the next, coalesced 0-RTT packet. |
| 1871 | */ |
| 1872 | static int conn_should_pad_pkt(ngtcp2_conn *conn, uint8_t type, size_t left, |
| 1873 | size_t early_datalen, int ack_eliciting) { |
| 1874 | size_t min_payloadlen; |
| 1875 | |
| 1876 | if (conn->server) { |
| 1877 | if (type != NGTCP2_PKT_INITIAL || !ack_eliciting) { |
| 1878 | return 0; |
| 1879 | } |
| 1880 | |
| 1881 | if (conn->hs_pktns->crypto.tx.ckm && |
| 1882 | (conn->hs_pktns->rtb.probe_pkt_left || |
| 1883 | ngtcp2_ksl_len(&conn->hs_pktns->crypto.tx.frq) || |
| 1884 | !ngtcp2_acktr_empty(&conn->hs_pktns->acktr))) { |
| 1885 | /* If we have something to send in Handshake packet, then add |
| 1886 | PADDING in Handshake packet. */ |
| 1887 | min_payloadlen = 128; |
| 1888 | } else { |
| 1889 | return 1; |
| 1890 | } |
| 1891 | } else { |
| 1892 | if (type == NGTCP2_PKT_HANDSHAKE) { |
| 1893 | return conn->in_pktns != NULL((void*)0); |
| 1894 | } |
| 1895 | |
| 1896 | if (conn->hs_pktns->crypto.tx.ckm && |
| 1897 | (conn->hs_pktns->rtb.probe_pkt_left || |
| 1898 | ngtcp2_ksl_len(&conn->hs_pktns->crypto.tx.frq) || |
| 1899 | !ngtcp2_acktr_empty(&conn->hs_pktns->acktr))) { |
| 1900 | /* If we have something to send in Handshake packet, then add |
| 1901 | PADDING in Handshake packet. */ |
| 1902 | min_payloadlen = 128; |
| 1903 | } else if (!conn->early.ckm || early_datalen == 0) { |
| 1904 | return 1; |
| 1905 | } else { |
| 1906 | /* If we have something to send in 0RTT packet, then add PADDING |
| 1907 | in 0RTT packet. */ |
| 1908 | min_payloadlen = ngtcp2_min(early_datalen, 128)((early_datalen) < (128) ? (early_datalen) : (128)); |
| 1909 | } |
| 1910 | } |
| 1911 | |
| 1912 | return left < |
| 1913 | /* TODO Assuming that pkt_num is encoded in 1 byte. */ |
| 1914 | NGTCP2_MIN_LONG_HEADERLEN(1 + 4 + 1 + 1 + 1 + 1) + conn->dcid.current.cid.datalen + |
| 1915 | conn->oscid.datalen + 1 /* payloadlen bytes - 1 */ + |
| 1916 | min_payloadlen + NGTCP2_MAX_AEAD_OVERHEAD16; |
| 1917 | } |
| 1918 | |
| 1919 | static void conn_restart_timer_on_write(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 1920 | conn->idle_ts = ts; |
| 1921 | conn->flags &= (uint16_t)~NGTCP2_CONN_FLAG_RESTART_IDLE_TIMER_ON_WRITE0x2000; |
| 1922 | } |
| 1923 | |
| 1924 | static void conn_restart_timer_on_read(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 1925 | conn->idle_ts = ts; |
| 1926 | conn->flags |= NGTCP2_CONN_FLAG_RESTART_IDLE_TIMER_ON_WRITE0x2000; |
| 1927 | } |
| 1928 | |
| 1929 | /* NGTCP2_WRITE_PKT_FLAG_NONE indicates that no flag is set. */ |
| 1930 | #define NGTCP2_WRITE_PKT_FLAG_NONE0x00 0x00 |
| 1931 | /* NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING indicates that packet should |
| 1932 | be padded */ |
| 1933 | #define NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING0x01 0x01 |
| 1934 | /* NGTCP2_WRITE_PKT_FLAG_MORE indicates that more frames might come |
| 1935 | and it should be encoded into the current packet. */ |
| 1936 | #define NGTCP2_WRITE_PKT_FLAG_MORE0x02 0x02 |
| 1937 | |
| 1938 | /* |
| 1939 | * conn_write_handshake_pkt writes handshake packet in the buffer |
| 1940 | * pointed by |dest| whose length is |destlen|. |type| specifies long |
| 1941 | * packet type. It should be either NGTCP2_PKT_INITIAL or |
| 1942 | * NGTCP2_PKT_HANDSHAKE_PKT. |
| 1943 | * |
| 1944 | * This function returns the number of bytes written in |dest| if it |
| 1945 | * succeeds, or one of the following negative error codes: |
| 1946 | * |
| 1947 | * NGTCP2_ERR_NOMEM |
| 1948 | * Out of memory. |
| 1949 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 1950 | * User-defined callback function failed. |
| 1951 | */ |
| 1952 | static ngtcp2_ssize |
| 1953 | conn_write_handshake_pkt(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, uint8_t *dest, |
| 1954 | size_t destlen, uint8_t type, uint8_t flags, |
| 1955 | size_t early_datalen, ngtcp2_tstamp ts) { |
| 1956 | int rv; |
| 1957 | ngtcp2_ppe ppe; |
| 1958 | ngtcp2_pkt_hd hd; |
| 1959 | ngtcp2_frame_chain *frq = NULL((void*)0), **pfrc = &frq; |
| 1960 | ngtcp2_frame_chain *nfrc; |
| 1961 | ngtcp2_frame *ackfr = NULL((void*)0), lfr; |
| 1962 | ngtcp2_ssize spktlen; |
| 1963 | ngtcp2_crypto_cc cc; |
| 1964 | ngtcp2_rtb_entry *rtbent; |
| 1965 | ngtcp2_pktns *pktns; |
| 1966 | size_t left; |
| 1967 | uint8_t rtb_entry_flags = NGTCP2_RTB_ENTRY_FLAG_NONE0x00; |
| 1968 | int require_padding = (flags & NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING0x01) != 0; |
| 1969 | int pkt_empty = 1; |
| 1970 | int padded = 0; |
| 1971 | int hd_logged = 0; |
| 1972 | uint64_t crypto_offset; |
| 1973 | ngtcp2_ssize num_reclaimed; |
| 1974 | |
| 1975 | switch (type) { |
| 1976 | case NGTCP2_PKT_INITIAL: |
| 1977 | if (!conn->in_pktns) { |
| 1978 | return 0; |
| 1979 | } |
| 1980 | assert(conn->in_pktns->crypto.tx.ckm)((void) (0)); |
| 1981 | pktns = conn->in_pktns; |
| 1982 | break; |
| 1983 | case NGTCP2_PKT_HANDSHAKE: |
| 1984 | if (!conn->hs_pktns || !conn->hs_pktns->crypto.tx.ckm) { |
| 1985 | return 0; |
| 1986 | } |
| 1987 | pktns = conn->hs_pktns; |
| 1988 | break; |
| 1989 | default: |
| 1990 | assert(0)((void) (0)); |
| 1991 | } |
| 1992 | |
| 1993 | cc.aead = pktns->crypto.ctx.aead; |
| 1994 | cc.hp = pktns->crypto.ctx.hp; |
| 1995 | cc.ckm = pktns->crypto.tx.ckm; |
| 1996 | cc.hp_ctx = pktns->crypto.tx.hp_ctx; |
| 1997 | cc.encrypt = conn->callbacks.encrypt; |
| 1998 | cc.hp_mask = conn->callbacks.hp_mask; |
| 1999 | |
| 2000 | ngtcp2_pkt_hd_init(&hd, NGTCP2_PKT_FLAG_LONG_FORM0x01, type, |
| 2001 | &conn->dcid.current.cid, &conn->oscid, |
| 2002 | pktns->tx.last_pkt_num + 1, pktns_select_pkt_numlen(pktns), |
| 2003 | conn->version, 0); |
| 2004 | |
| 2005 | if (!conn->server && type == NGTCP2_PKT_INITIAL && |
| 2006 | conn->local.settings.token.len) { |
| 2007 | hd.token = conn->local.settings.token; |
| 2008 | } |
| 2009 | |
| 2010 | ngtcp2_ppe_init(&ppe, dest, destlen, &cc); |
| 2011 | |
| 2012 | rv = ngtcp2_ppe_encode_hd(&ppe, &hd); |
| 2013 | if (rv != 0) { |
| 2014 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 2015 | return 0; |
| 2016 | } |
| 2017 | |
| 2018 | if (!ngtcp2_ppe_ensure_hp_sample(&ppe)) { |
| 2019 | return 0; |
| 2020 | } |
| 2021 | |
| 2022 | rv = conn_create_ack_frame(conn, &ackfr, pktns, type, ts, |
| 2023 | /* ack_delay = */ 0, |
| 2024 | NGTCP2_DEFAULT_ACK_DELAY_EXPONENT3); |
| 2025 | if (rv != 0) { |
| 2026 | ngtcp2_frame_chain_list_del(frq, conn->mem); |
| 2027 | return rv; |
| 2028 | } |
| 2029 | |
| 2030 | if (ackfr) { |
| 2031 | rv = conn_ppe_write_frame_hd_log(conn, &ppe, &hd_logged, &hd, ackfr); |
| 2032 | if (rv != 0) { |
| 2033 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 2034 | } else { |
| 2035 | ngtcp2_acktr_commit_ack(&pktns->acktr); |
| 2036 | ngtcp2_acktr_add_ack(&pktns->acktr, hd.pkt_num, ackfr->ack.largest_ack); |
| 2037 | pkt_empty = 0; |
| 2038 | } |
| 2039 | } |
| 2040 | |
| 2041 | /* Server requires at least NGTCP2_DEFAULT_MAX_PKTLEN bytes in order |
| 2042 | to send ack-eliciting Initial packet. */ |
| 2043 | if (!conn->server || type != NGTCP2_PKT_INITIAL || |
| 2044 | destlen >= NGTCP2_DEFAULT_MAX_PKTLEN1200) { |
| 2045 | build_pkt: |
| 2046 | for (; ngtcp2_ksl_len(&pktns->crypto.tx.frq);) { |
| 2047 | left = ngtcp2_ppe_left(&ppe); |
| 2048 | |
| 2049 | crypto_offset = conn_cryptofrq_unacked_offset(conn, pktns); |
| 2050 | if (crypto_offset == (size_t)-1) { |
| 2051 | conn_cryptofrq_clear(conn, pktns); |
| 2052 | break; |
| 2053 | } |
| 2054 | |
| 2055 | left = ngtcp2_pkt_crypto_max_datalen(crypto_offset, left, left); |
| 2056 | if (left == (size_t)-1) { |
| 2057 | break; |
| 2058 | } |
| 2059 | |
| 2060 | rv = conn_cryptofrq_pop(conn, &nfrc, pktns, left); |
| 2061 | if (rv != 0) { |
| 2062 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 2063 | ngtcp2_frame_chain_list_del(frq, conn->mem); |
| 2064 | return rv; |
| 2065 | } |
| 2066 | |
| 2067 | if (nfrc == NULL((void*)0)) { |
| 2068 | break; |
| 2069 | } |
| 2070 | |
| 2071 | rv = conn_ppe_write_frame_hd_log(conn, &ppe, &hd_logged, &hd, &nfrc->fr); |
| 2072 | if (rv != 0) { |
| 2073 | assert(0)((void) (0)); |
| 2074 | } |
| 2075 | |
| 2076 | *pfrc = nfrc; |
| 2077 | pfrc = &(*pfrc)->next; |
| 2078 | |
| 2079 | pkt_empty = 0; |
| 2080 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 2081 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 2082 | } |
| 2083 | |
| 2084 | if (!(rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 2085 | pktns->rtb.num_retransmittable && pktns->rtb.probe_pkt_left) { |
| 2086 | num_reclaimed = ngtcp2_rtb_reclaim_on_pto(&pktns->rtb, conn, pktns, |
| 2087 | pktns->rtb.probe_pkt_left + 1); |
| 2088 | if (num_reclaimed < 0) { |
| 2089 | ngtcp2_frame_chain_list_del(frq, conn->mem); |
| 2090 | return rv; |
| 2091 | } |
| 2092 | if (num_reclaimed) { |
| 2093 | goto build_pkt; |
| 2094 | } |
| 2095 | /* We had pktns->rtb.num_retransmittable > 0 but the contents of |
| 2096 | those packets have been acknowledged (i.e., retransmission in |
| 2097 | another packet). For server, in this case, we don't have to |
| 2098 | send any probe packet. Client needs to send probe packets |
| 2099 | until it knows that server has completed address validation or |
| 2100 | handshake has been confirmed. */ |
| 2101 | if (pktns->rtb.num_retransmittable == 0 && |
| 2102 | (conn->server || |
| 2103 | (conn->flags & (NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000 | |
| 2104 | NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)))) { |
| 2105 | pktns->rtb.probe_pkt_left = 0; |
| 2106 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 2107 | } |
| 2108 | } |
| 2109 | |
| 2110 | /* Don't send any PING frame if client Initial has not been |
| 2111 | acknowledged yet. */ |
| 2112 | if (!(rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 2113 | pktns->rtb.probe_pkt_left && |
| 2114 | (type != NGTCP2_PKT_INITIAL || |
| 2115 | ngtcp2_strm_is_all_tx_data_acked(&pktns->crypto.strm))) { |
| 2116 | lfr.type = NGTCP2_FRAME_PING; |
| 2117 | |
| 2118 | rv = conn_ppe_write_frame_hd_log(conn, &ppe, &hd_logged, &hd, &lfr); |
| 2119 | if (rv != 0) { |
| 2120 | assert(rv == NGTCP2_ERR_NOBUF)((void) (0)); |
| 2121 | } else { |
| 2122 | rtb_entry_flags |= |
| 2123 | NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | NGTCP2_RTB_ENTRY_FLAG_PROBE0x01; |
| 2124 | pkt_empty = 0; |
| 2125 | } |
| 2126 | } |
| 2127 | |
| 2128 | if (!pkt_empty) { |
| 2129 | if (!(rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04)) { |
| 2130 | /* The intention of smaller limit is get more chance to measure |
| 2131 | RTT samples in early phase. */ |
| 2132 | if (pktns->rtb.probe_pkt_left || pktns->tx.num_non_ack_pkt >= 1) { |
| 2133 | lfr.type = NGTCP2_FRAME_PING; |
| 2134 | |
| 2135 | rv = conn_ppe_write_frame_hd_log(conn, &ppe, &hd_logged, &hd, &lfr); |
| 2136 | if (rv != 0) { |
| 2137 | assert(rv == NGTCP2_ERR_NOBUF)((void) (0)); |
| 2138 | } else { |
| 2139 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04; |
| 2140 | pktns->tx.num_non_ack_pkt = 0; |
| 2141 | } |
| 2142 | } else { |
| 2143 | ++pktns->tx.num_non_ack_pkt; |
| 2144 | } |
| 2145 | } else { |
| 2146 | pktns->tx.num_non_ack_pkt = 0; |
| 2147 | } |
| 2148 | } |
| 2149 | } |
| 2150 | |
| 2151 | if (pkt_empty) { |
| 2152 | return 0; |
| 2153 | } |
| 2154 | |
| 2155 | /* If we cannot write another packet, then we need to add padding to |
| 2156 | Initial here. */ |
| 2157 | if (require_padding || |
| 2158 | conn_should_pad_pkt( |
| 2159 | conn, type, ngtcp2_ppe_left(&ppe), early_datalen, |
| 2160 | (rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) != 0)) { |
| 2161 | lfr.type = NGTCP2_FRAME_PADDING; |
| 2162 | lfr.padding.len = ngtcp2_ppe_padding(&ppe); |
| 2163 | } else { |
| 2164 | lfr.type = NGTCP2_FRAME_PADDING; |
| 2165 | lfr.padding.len = ngtcp2_ppe_padding_hp_sample(&ppe); |
| 2166 | } |
| 2167 | |
| 2168 | if (lfr.padding.len) { |
| 2169 | padded = 1; |
| 2170 | ngtcp2_log_tx_fr(&conn->log, &hd, &lfr); |
| 2171 | ngtcp2_qlog_write_frame(&conn->qlog, &lfr); |
| 2172 | } |
| 2173 | |
| 2174 | spktlen = ngtcp2_ppe_final(&ppe, NULL((void*)0)); |
| 2175 | if (spktlen < 0) { |
| 2176 | assert(ngtcp2_err_is_fatal((int)spktlen))((void) (0)); |
| 2177 | ngtcp2_frame_chain_list_del(frq, conn->mem); |
| 2178 | return spktlen; |
| 2179 | } |
| 2180 | |
| 2181 | ngtcp2_qlog_pkt_sent_end(&conn->qlog, &hd, (size_t)spktlen); |
| 2182 | |
| 2183 | if ((rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) || padded) { |
| 2184 | if (pi) { |
| 2185 | conn_handle_tx_ecn(conn, pi, &rtb_entry_flags, pktns, &hd, ts); |
| 2186 | } |
| 2187 | |
| 2188 | rv = ngtcp2_rtb_entry_new(&rtbent, &hd, frq, ts, (size_t)spktlen, |
| 2189 | rtb_entry_flags, conn->mem); |
| 2190 | if (rv != 0) { |
| 2191 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 2192 | ngtcp2_frame_chain_list_del(frq, conn->mem); |
| 2193 | return rv; |
| 2194 | } |
| 2195 | |
| 2196 | rv = conn_on_pkt_sent(conn, &pktns->rtb, rtbent); |
| 2197 | if (rv != 0) { |
| 2198 | ngtcp2_rtb_entry_del(rtbent, conn->mem); |
| 2199 | return rv; |
| 2200 | } |
| 2201 | |
| 2202 | if ((rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 2203 | (conn->flags & NGTCP2_CONN_FLAG_RESTART_IDLE_TIMER_ON_WRITE0x2000)) { |
| 2204 | conn_restart_timer_on_write(conn, ts); |
| 2205 | } |
| 2206 | } else if (pi && conn->tx.ecn.state == NGTCP2_ECN_STATE_CAPABLE) { |
| 2207 | conn_handle_tx_ecn(conn, pi, NULL((void*)0), pktns, &hd, ts); |
| 2208 | } |
| 2209 | |
| 2210 | if (pktns->rtb.probe_pkt_left && |
| 2211 | (rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04)) { |
| 2212 | --pktns->rtb.probe_pkt_left; |
| 2213 | } |
| 2214 | |
| 2215 | conn->dcid.current.bytes_sent += (uint64_t)spktlen; |
| 2216 | |
| 2217 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 2218 | |
| 2219 | ++pktns->tx.last_pkt_num; |
| 2220 | |
| 2221 | return spktlen; |
| 2222 | } |
| 2223 | |
| 2224 | /* |
| 2225 | * conn_write_ack_pkt writes QUIC packet for type |type| which only |
| 2226 | * includes ACK frame in the buffer pointed by |dest| whose length is |
| 2227 | * |destlen|. |
| 2228 | * |
| 2229 | * This function returns the number of bytes written in |dest| if it |
| 2230 | * succeeds, or one of the following negative error codes: |
| 2231 | * |
| 2232 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2233 | * User-defined callback function failed. |
| 2234 | * NGTCP2_ERR_NOMEM |
| 2235 | * Out of memory. |
| 2236 | */ |
| 2237 | static ngtcp2_ssize conn_write_ack_pkt(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, |
| 2238 | uint8_t *dest, size_t destlen, |
| 2239 | uint8_t type, ngtcp2_tstamp ts) { |
| 2240 | int rv; |
| 2241 | ngtcp2_frame *ackfr; |
| 2242 | ngtcp2_pktns *pktns; |
| 2243 | ngtcp2_duration ack_delay; |
| 2244 | uint64_t ack_delay_exponent; |
| 2245 | ngtcp2_ssize spktlen; |
| 2246 | |
| 2247 | assert(!(conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING))((void) (0)); |
| 2248 | |
| 2249 | switch (type) { |
| 2250 | case NGTCP2_PKT_INITIAL: |
| 2251 | assert(conn->server)((void) (0)); |
| 2252 | pktns = conn->in_pktns; |
| 2253 | ack_delay = 0; |
| 2254 | ack_delay_exponent = NGTCP2_DEFAULT_ACK_DELAY_EXPONENT3; |
| 2255 | break; |
| 2256 | case NGTCP2_PKT_HANDSHAKE: |
| 2257 | pktns = conn->hs_pktns; |
| 2258 | ack_delay = 0; |
| 2259 | ack_delay_exponent = NGTCP2_DEFAULT_ACK_DELAY_EXPONENT3; |
| 2260 | break; |
| 2261 | case NGTCP2_PKT_SHORT: |
| 2262 | pktns = &conn->pktns; |
| 2263 | ack_delay = conn_compute_ack_delay(conn); |
| 2264 | ack_delay_exponent = conn->local.transport_params.ack_delay_exponent; |
| 2265 | break; |
| 2266 | default: |
| 2267 | assert(0)((void) (0)); |
| 2268 | } |
| 2269 | |
| 2270 | if (!pktns->crypto.tx.ckm) { |
| 2271 | return 0; |
| 2272 | } |
| 2273 | |
| 2274 | ackfr = NULL((void*)0); |
| 2275 | rv = conn_create_ack_frame(conn, &ackfr, pktns, type, ts, ack_delay, |
| 2276 | ack_delay_exponent); |
| 2277 | if (rv != 0) { |
| 2278 | return rv; |
| 2279 | } |
| 2280 | |
| 2281 | if (!ackfr) { |
| 2282 | return 0; |
| 2283 | } |
| 2284 | |
| 2285 | spktlen = ngtcp2_conn_write_single_frame_pkt( |
| 2286 | conn, pi, dest, destlen, type, &conn->dcid.current.cid, ackfr, |
| 2287 | NGTCP2_RTB_ENTRY_FLAG_NONE0x00, NULL((void*)0), ts); |
| 2288 | |
| 2289 | if (spktlen <= 0) { |
| 2290 | return spktlen; |
| 2291 | } |
| 2292 | |
| 2293 | conn->dcid.current.bytes_sent += (uint64_t)spktlen; |
| 2294 | |
| 2295 | return spktlen; |
| 2296 | } |
| 2297 | |
| 2298 | static void conn_discard_pktns(ngtcp2_conn *conn, ngtcp2_pktns **ppktns, |
| 2299 | ngtcp2_tstamp ts) { |
| 2300 | ngtcp2_pktns *pktns = *ppktns; |
| 2301 | uint64_t bytes_in_flight; |
| 2302 | |
| 2303 | bytes_in_flight = pktns->rtb.cc_bytes_in_flight; |
| 2304 | |
| 2305 | assert(conn->cstat.bytes_in_flight >= bytes_in_flight)((void) (0)); |
| 2306 | |
| 2307 | conn->cstat.bytes_in_flight -= bytes_in_flight; |
| 2308 | conn->cstat.pto_count = 0; |
| 2309 | conn->cstat.last_tx_pkt_ts[pktns->rtb.pktns_id] = UINT64_MAX(18446744073709551615UL); |
| 2310 | conn->cstat.loss_time[pktns->rtb.pktns_id] = UINT64_MAX(18446744073709551615UL); |
| 2311 | |
| 2312 | conn_call_delete_crypto_aead_ctx(conn, &pktns->crypto.rx.ckm->aead_ctx); |
| 2313 | conn_call_delete_crypto_cipher_ctx(conn, &pktns->crypto.rx.hp_ctx); |
| 2314 | conn_call_delete_crypto_aead_ctx(conn, &pktns->crypto.tx.ckm->aead_ctx); |
| 2315 | conn_call_delete_crypto_cipher_ctx(conn, &pktns->crypto.tx.hp_ctx); |
| 2316 | |
| 2317 | pktns_del(pktns, conn->mem); |
| 2318 | *ppktns = NULL((void*)0); |
| 2319 | |
| 2320 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 2321 | } |
| 2322 | |
| 2323 | /* |
| 2324 | * conn_discard_initial_state discards state for Initial packet number |
| 2325 | * space. |
| 2326 | */ |
| 2327 | static void conn_discard_initial_state(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 2328 | if (!conn->in_pktns) { |
| 2329 | return; |
| 2330 | } |
| 2331 | |
| 2332 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 2333 | "discarding Initial packet number space"); |
| 2334 | |
| 2335 | conn_discard_pktns(conn, &conn->in_pktns, ts); |
| 2336 | } |
| 2337 | |
| 2338 | /* |
| 2339 | * conn_discard_handshake_state discards state for Handshake packet |
| 2340 | * number space. |
| 2341 | */ |
| 2342 | static void conn_discard_handshake_state(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 2343 | if (!conn->hs_pktns) { |
| 2344 | return; |
| 2345 | } |
| 2346 | |
| 2347 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 2348 | "discarding Handshake packet number space"); |
| 2349 | |
| 2350 | conn_discard_pktns(conn, &conn->hs_pktns, ts); |
| 2351 | } |
| 2352 | |
| 2353 | /* |
| 2354 | * conn_discard_early_key discards early key. |
| 2355 | */ |
| 2356 | static void conn_discard_early_key(ngtcp2_conn *conn) { |
| 2357 | assert(conn->early.ckm)((void) (0)); |
| 2358 | |
| 2359 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, "discarding early key"); |
| 2360 | |
| 2361 | conn_call_delete_crypto_aead_ctx(conn, &conn->early.ckm->aead_ctx); |
| 2362 | conn_call_delete_crypto_cipher_ctx(conn, &conn->early.hp_ctx); |
| 2363 | memset(&conn->early.hp_ctx, 0, sizeof(conn->early.hp_ctx)); |
| 2364 | |
| 2365 | ngtcp2_crypto_km_del(conn->early.ckm, conn->mem); |
| 2366 | conn->early.ckm = NULL((void*)0); |
| 2367 | } |
| 2368 | |
| 2369 | /* |
| 2370 | * conn_write_handshake_ack_pkts writes packets which contain ACK |
| 2371 | * frame only. This function writes at most 2 packets for each |
| 2372 | * Initial and Handshake packet. |
| 2373 | */ |
| 2374 | static ngtcp2_ssize conn_write_handshake_ack_pkts(ngtcp2_conn *conn, |
| 2375 | ngtcp2_pkt_info *pi, |
| 2376 | uint8_t *dest, size_t destlen, |
| 2377 | ngtcp2_tstamp ts) { |
| 2378 | ngtcp2_ssize res = 0, nwrite = 0; |
| 2379 | |
| 2380 | /* In the most cases, client sends ACK in conn_write_handshake_pkt. |
| 2381 | This function is only called when it is CWND limited. It is not |
| 2382 | required for client to send ACK for server Initial. This is |
| 2383 | because once it gets server Initial, it gets Handshake tx key and |
| 2384 | discards Initial key. The only good reason to send ACK is give |
| 2385 | server RTT measurement early. */ |
| 2386 | if (conn->server && conn->in_pktns) { |
| 2387 | nwrite = |
| 2388 | conn_write_ack_pkt(conn, pi, dest, destlen, NGTCP2_PKT_INITIAL, ts); |
| 2389 | if (nwrite < 0) { |
| 2390 | assert(nwrite != NGTCP2_ERR_NOBUF)((void) (0)); |
| 2391 | return nwrite; |
| 2392 | } |
| 2393 | |
| 2394 | res += nwrite; |
| 2395 | dest += nwrite; |
| 2396 | destlen -= (size_t)nwrite; |
| 2397 | } |
| 2398 | |
| 2399 | if (conn->hs_pktns->crypto.tx.ckm) { |
| 2400 | nwrite = |
| 2401 | conn_write_ack_pkt(conn, pi, dest, destlen, NGTCP2_PKT_HANDSHAKE, ts); |
| 2402 | if (nwrite < 0) { |
| 2403 | assert(nwrite != NGTCP2_ERR_NOBUF)((void) (0)); |
| 2404 | return nwrite; |
| 2405 | } |
| 2406 | |
| 2407 | res += nwrite; |
| 2408 | |
| 2409 | if (!conn->server && nwrite) { |
| 2410 | conn_discard_initial_state(conn, ts); |
| 2411 | } |
| 2412 | } |
| 2413 | |
| 2414 | return res; |
| 2415 | } |
| 2416 | |
| 2417 | /* |
| 2418 | * conn_write_client_initial writes Initial packet in the buffer |
| 2419 | * pointed by |dest| whose length is |destlen|. |
| 2420 | * |
| 2421 | * This function returns the number of bytes written in |dest| if it |
| 2422 | * succeeds, or one of the following negative error codes: |
| 2423 | * |
| 2424 | * NGTCP2_ERR_NOMEM |
| 2425 | * Out of memory. |
| 2426 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2427 | * User-defined callback function failed. |
| 2428 | */ |
| 2429 | static ngtcp2_ssize conn_write_client_initial(ngtcp2_conn *conn, |
| 2430 | ngtcp2_pkt_info *pi, |
| 2431 | uint8_t *dest, size_t destlen, |
| 2432 | size_t early_datalen, |
| 2433 | ngtcp2_tstamp ts) { |
| 2434 | int rv; |
| 2435 | |
| 2436 | assert(conn->callbacks.client_initial)((void) (0)); |
| 2437 | |
| 2438 | rv = conn->callbacks.client_initial(conn, conn->user_data); |
| 2439 | if (rv != 0) { |
| 2440 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 2441 | } |
| 2442 | |
| 2443 | return conn_write_handshake_pkt(conn, pi, dest, destlen, NGTCP2_PKT_INITIAL, |
| 2444 | NGTCP2_WRITE_PKT_FLAG_NONE0x00, early_datalen, |
| 2445 | ts); |
| 2446 | } |
| 2447 | |
| 2448 | /* |
| 2449 | * conn_write_handshake_pkts writes Initial and Handshake packets in |
| 2450 | * the buffer pointed by |dest| whose length is |destlen|. |
| 2451 | * |
| 2452 | * This function returns the number of bytes written in |dest| if it |
| 2453 | * succeeds, or one of the following negative error codes: |
| 2454 | * |
| 2455 | * NGTCP2_ERR_NOMEM |
| 2456 | * Out of memory. |
| 2457 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2458 | * User-defined callback function failed. |
| 2459 | */ |
| 2460 | static ngtcp2_ssize conn_write_handshake_pkts(ngtcp2_conn *conn, |
| 2461 | ngtcp2_pkt_info *pi, |
| 2462 | uint8_t *dest, size_t destlen, |
| 2463 | size_t early_datalen, |
| 2464 | ngtcp2_tstamp ts) { |
| 2465 | ngtcp2_ssize nwrite; |
| 2466 | ngtcp2_ssize res = 0; |
| 2467 | int64_t prev_pkt_num = -1; |
| 2468 | ngtcp2_rtb_entry *rtbent; |
| 2469 | uint8_t wflags = NGTCP2_WRITE_PKT_FLAG_NONE0x00; |
| 2470 | ngtcp2_ksl_it it; |
| 2471 | |
| 2472 | /* As a client, we would like to discard Initial packet number space |
| 2473 | when sending the first Handshake packet. When sending Handshake |
| 2474 | packet, it should be one of 1) sending ACK, 2) sending PTO probe |
| 2475 | packet, or 3) sending CRYPTO. If we have pending acknowledgement |
| 2476 | for Initial, then do not discard Initial packet number space. |
| 2477 | Otherwise, if either 1) or 2) is satisfied, discard Initial |
| 2478 | packet number space. When sending Handshake CRYPTO, it indicates |
| 2479 | that client has received Handshake CRYPTO from server. Initial |
| 2480 | packet number space is discarded because 1) is met. If there is |
| 2481 | pending Initial ACK, Initial packet number space is discarded |
| 2482 | after writing the first Handshake packet. |
| 2483 | */ |
| 2484 | if (!conn->server && conn->hs_pktns->crypto.tx.ckm && conn->in_pktns && |
| 2485 | !ngtcp2_acktr_require_active_ack(&conn->in_pktns->acktr, |
| 2486 | /* max_ack_delay = */ 0, ts) && |
| 2487 | (ngtcp2_acktr_require_active_ack(&conn->hs_pktns->acktr, |
| 2488 | /* max_ack_delay = */ 0, ts) || |
| 2489 | conn->hs_pktns->rtb.probe_pkt_left)) { |
| 2490 | /* Discard Initial state here so that Handshake packet is not |
| 2491 | padded. */ |
| 2492 | conn_discard_initial_state(conn, ts); |
| 2493 | } else if (conn->in_pktns) { |
| 2494 | if (conn->server) { |
| 2495 | it = ngtcp2_rtb_head(&conn->in_pktns->rtb); |
| 2496 | if (!ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0))) { |
| 2497 | rtbent = ngtcp2_ksl_it_get(&it); |
| 2498 | prev_pkt_num = rtbent->hd.pkt_num; |
| 2499 | } |
| 2500 | } |
| 2501 | |
| 2502 | nwrite = |
| 2503 | conn_write_handshake_pkt(conn, pi, dest, destlen, NGTCP2_PKT_INITIAL, |
| 2504 | NGTCP2_WRITE_PKT_FLAG_NONE0x00, early_datalen, ts); |
| 2505 | if (nwrite < 0) { |
| 2506 | assert(nwrite != NGTCP2_ERR_NOBUF)((void) (0)); |
| 2507 | return nwrite; |
| 2508 | } |
| 2509 | |
| 2510 | if (nwrite == 0) { |
| 2511 | if (conn->server && (conn->in_pktns->rtb.probe_pkt_left || |
| 2512 | ngtcp2_ksl_len(&conn->in_pktns->crypto.tx.frq))) { |
| 2513 | return 0; |
| 2514 | } |
| 2515 | } else { |
| 2516 | res += nwrite; |
| 2517 | dest += nwrite; |
| 2518 | destlen -= (size_t)nwrite; |
| 2519 | |
| 2520 | if (conn->server && destlen) { |
| 2521 | it = ngtcp2_rtb_head(&conn->in_pktns->rtb); |
| 2522 | if (!ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0))) { |
| 2523 | rtbent = ngtcp2_ksl_it_get(&it); |
| 2524 | if (rtbent->hd.pkt_num != prev_pkt_num && |
| 2525 | (rtbent->flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04)) { |
| 2526 | /* We might have already added padding to Initial, but in |
| 2527 | that case, we should have destlen == 0 and no Handshake |
| 2528 | packet will be written. */ |
| 2529 | wflags |= NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING0x01; |
| 2530 | } |
| 2531 | } |
| 2532 | } |
| 2533 | } |
| 2534 | } |
| 2535 | |
| 2536 | nwrite = conn_write_handshake_pkt(conn, pi, dest, destlen, |
| 2537 | NGTCP2_PKT_HANDSHAKE, wflags, 0, ts); |
| 2538 | if (nwrite < 0) { |
| 2539 | assert(nwrite != NGTCP2_ERR_NOBUF)((void) (0)); |
| 2540 | return nwrite; |
| 2541 | } |
| 2542 | |
| 2543 | res += nwrite; |
| 2544 | |
| 2545 | if (!conn->server && conn->hs_pktns->crypto.tx.ckm && nwrite) { |
| 2546 | /* We don't need to send further Initial packet if we have |
| 2547 | Handshake key and sent something with it. So discard initial |
| 2548 | state here. */ |
| 2549 | conn_discard_initial_state(conn, ts); |
| 2550 | } |
| 2551 | |
| 2552 | return res; |
| 2553 | } |
| 2554 | |
| 2555 | /* |
| 2556 | * conn_initial_stream_rx_offset returns the initial maximum offset of |
| 2557 | * data for a stream denoted by |stream_id|. |
| 2558 | */ |
| 2559 | static uint64_t conn_initial_stream_rx_offset(ngtcp2_conn *conn, |
| 2560 | int64_t stream_id) { |
| 2561 | int local_stream = conn_local_stream(conn, stream_id); |
| 2562 | |
| 2563 | if (bidi_stream(stream_id)) { |
| 2564 | if (local_stream) { |
| 2565 | return conn->local.transport_params.initial_max_stream_data_bidi_local; |
| 2566 | } |
| 2567 | return conn->local.transport_params.initial_max_stream_data_bidi_remote; |
| 2568 | } |
| 2569 | |
| 2570 | if (local_stream) { |
| 2571 | return 0; |
| 2572 | } |
| 2573 | return conn->local.transport_params.initial_max_stream_data_uni; |
| 2574 | } |
| 2575 | |
| 2576 | /* |
| 2577 | * conn_should_send_max_stream_data returns nonzero if MAX_STREAM_DATA |
| 2578 | * frame should be send for |strm|. |
| 2579 | */ |
| 2580 | static int conn_should_send_max_stream_data(ngtcp2_conn *conn, |
| 2581 | ngtcp2_strm *strm) { |
| 2582 | uint64_t inc = strm->rx.unsent_max_offset - strm->rx.max_offset; |
| 2583 | (void)conn; |
| 2584 | |
| 2585 | return strm->rx.window < 2 * inc; |
| 2586 | } |
| 2587 | |
| 2588 | /* |
| 2589 | * conn_should_send_max_data returns nonzero if MAX_DATA frame should |
| 2590 | * be sent. |
| 2591 | */ |
| 2592 | static int conn_should_send_max_data(ngtcp2_conn *conn) { |
| 2593 | uint64_t inc = conn->rx.unsent_max_offset - conn->rx.max_offset; |
| 2594 | |
| 2595 | return conn->rx.window < 2 * inc; |
| 2596 | } |
| 2597 | |
| 2598 | /* |
| 2599 | * conn_required_num_new_connection_id returns the number of |
| 2600 | * additional connection ID the local endpoint has to provide to the |
| 2601 | * remote endpoint. |
| 2602 | */ |
| 2603 | static size_t conn_required_num_new_connection_id(ngtcp2_conn *conn) { |
| 2604 | uint64_t n; |
| 2605 | size_t len = ngtcp2_ksl_len(&conn->scid.set); |
| 2606 | |
| 2607 | if (len >= NGTCP2_MAX_SCID_POOL_SIZE8) { |
| 2608 | return 0; |
| 2609 | } |
| 2610 | |
| 2611 | assert(conn->remote.transport_params.active_connection_id_limit)((void) (0)); |
| 2612 | |
| 2613 | /* len includes retired CID. We don't provide extra CID if doing so |
| 2614 | exceeds NGTCP2_MAX_SCID_POOL_SIZE. */ |
| 2615 | |
| 2616 | n = conn->remote.transport_params.active_connection_id_limit + |
| 2617 | conn->scid.num_retired; |
| 2618 | |
| 2619 | return (size_t)ngtcp2_min(NGTCP2_MAX_SCID_POOL_SIZE, n)((8) < (n) ? (8) : (n)) - len; |
| 2620 | } |
| 2621 | |
| 2622 | /* |
| 2623 | * conn_enqueue_new_connection_id generates additional connection IDs |
| 2624 | * and prepares to send them to the remote endpoint. |
| 2625 | * |
| 2626 | * This function returns 0 if it succeeds, or one of the following |
| 2627 | * negative error codes: |
| 2628 | * |
| 2629 | * NGTCP2_ERR_NOMEM |
| 2630 | * Out of memory. |
| 2631 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2632 | * User-defined callback function failed. |
| 2633 | */ |
| 2634 | static int conn_enqueue_new_connection_id(ngtcp2_conn *conn) { |
| 2635 | size_t i, need = conn_required_num_new_connection_id(conn); |
| 2636 | size_t cidlen = conn->oscid.datalen; |
| 2637 | ngtcp2_cid cid; |
| 2638 | uint64_t seq; |
| 2639 | int rv; |
| 2640 | uint8_t token[NGTCP2_STATELESS_RESET_TOKENLEN16]; |
| 2641 | ngtcp2_frame_chain *nfrc; |
| 2642 | ngtcp2_pktns *pktns = &conn->pktns; |
| 2643 | ngtcp2_scid *scid; |
| 2644 | ngtcp2_ksl_it it; |
| 2645 | |
| 2646 | for (i = 0; i < need; ++i) { |
| 2647 | rv = conn_call_get_new_connection_id(conn, &cid, token, cidlen); |
| 2648 | if (rv != 0) { |
| 2649 | return rv; |
| 2650 | } |
| 2651 | |
| 2652 | if (cid.datalen != cidlen) { |
| 2653 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 2654 | } |
| 2655 | |
| 2656 | /* Assert uniqueness */ |
| 2657 | it = ngtcp2_ksl_lower_bound(&conn->scid.set, &cid); |
| 2658 | if (!ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)) && |
| 2659 | ngtcp2_cid_eq(ngtcp2_ksl_it_key(&it)((ngtcp2_ksl_key *)((ngtcp2_ksl_node *)(void *)(((&it)-> blk)->nodes + ((&it)->ksl)->nodelen * ((&it) ->i)))->key), &cid)) { |
| 2660 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 2661 | } |
| 2662 | |
| 2663 | seq = ++conn->scid.last_seq; |
| 2664 | |
| 2665 | scid = ngtcp2_mem_malloc(conn->mem, sizeof(*scid)); |
| 2666 | if (scid == NULL((void*)0)) { |
| 2667 | return NGTCP2_ERR_NOMEM-501; |
| 2668 | } |
| 2669 | |
| 2670 | ngtcp2_scid_init(scid, seq, &cid, token); |
| 2671 | |
| 2672 | rv = ngtcp2_ksl_insert(&conn->scid.set, NULL((void*)0), &scid->cid, scid); |
| 2673 | if (rv != 0) { |
| 2674 | ngtcp2_mem_free(conn->mem, scid); |
| 2675 | return rv; |
| 2676 | } |
| 2677 | |
| 2678 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 2679 | if (rv != 0) { |
| 2680 | return rv; |
| 2681 | } |
| 2682 | |
| 2683 | nfrc->fr.type = NGTCP2_FRAME_NEW_CONNECTION_ID; |
| 2684 | nfrc->fr.new_connection_id.seq = seq; |
| 2685 | nfrc->fr.new_connection_id.retire_prior_to = 0; |
| 2686 | nfrc->fr.new_connection_id.cid = cid; |
| 2687 | memcpy(nfrc->fr.new_connection_id.stateless_reset_token, token, |
| 2688 | sizeof(token)); |
| 2689 | nfrc->next = pktns->tx.frq; |
| 2690 | pktns->tx.frq = nfrc; |
| 2691 | } |
| 2692 | |
| 2693 | return 0; |
| 2694 | } |
| 2695 | |
| 2696 | /* |
| 2697 | * conn_remove_retired_connection_id removes the already retired |
| 2698 | * connection ID. It waits PTO before actually removing a connection |
| 2699 | * ID after it receives RETIRE_CONNECTION_ID from peer to catch |
| 2700 | * reordered packets. |
| 2701 | * |
| 2702 | * This function returns 0 if it succeeds, or one of the following |
| 2703 | * negative error codes: |
| 2704 | * |
| 2705 | * NGTCP2_ERR_NOMEM |
| 2706 | * Out of memory. |
| 2707 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2708 | * User-defined callback function failed. |
| 2709 | */ |
| 2710 | static int conn_remove_retired_connection_id(ngtcp2_conn *conn, |
| 2711 | ngtcp2_duration pto, |
| 2712 | ngtcp2_tstamp ts) { |
| 2713 | ngtcp2_duration timeout = pto; |
| 2714 | ngtcp2_scid *scid; |
| 2715 | ngtcp2_dcid *dcid; |
| 2716 | int rv; |
| 2717 | |
| 2718 | for (; !ngtcp2_pq_empty(&conn->scid.used);) { |
| 2719 | scid = ngtcp2_struct_of(ngtcp2_pq_top(&conn->scid.used), ngtcp2_scid, pe)((ngtcp2_scid *)(void *)((char *)(ngtcp2_pq_top(&conn-> scid.used))-__builtin_offsetof(ngtcp2_scid, pe))); |
| 2720 | |
| 2721 | if (scid->ts_retired == UINT64_MAX(18446744073709551615UL) || scid->ts_retired + timeout >= ts) { |
| 2722 | break; |
| 2723 | } |
| 2724 | |
| 2725 | assert(scid->flags & NGTCP2_SCID_FLAG_RETIRED)((void) (0)); |
| 2726 | |
| 2727 | rv = conn_call_remove_connection_id(conn, &scid->cid); |
| 2728 | if (rv != 0) { |
| 2729 | return rv; |
| 2730 | } |
| 2731 | |
| 2732 | ngtcp2_ksl_remove(&conn->scid.set, NULL((void*)0), &scid->cid); |
| 2733 | ngtcp2_pq_pop(&conn->scid.used); |
| 2734 | ngtcp2_mem_free(conn->mem, scid); |
| 2735 | |
| 2736 | assert(conn->scid.num_retired)((void) (0)); |
| 2737 | --conn->scid.num_retired; |
| 2738 | } |
| 2739 | |
| 2740 | for (; ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len);) { |
| 2741 | dcid = ngtcp2_ringbuf_get(&conn->dcid.retired, 0); |
| 2742 | if (dcid->ts_retired + timeout >= ts) { |
| 2743 | break; |
| 2744 | } |
| 2745 | |
| 2746 | rv = conn_call_deactivate_dcid(conn, dcid); |
| 2747 | if (rv != 0) { |
| 2748 | return rv; |
| 2749 | } |
| 2750 | |
| 2751 | ngtcp2_ringbuf_pop_front(&conn->dcid.retired); |
| 2752 | } |
| 2753 | |
| 2754 | return 0; |
| 2755 | } |
| 2756 | |
| 2757 | /* |
| 2758 | * conn_min_short_pktlen returns the minimum length of Short packet |
| 2759 | * this endpoint sends. |
| 2760 | */ |
| 2761 | static size_t conn_min_short_pktlen(ngtcp2_conn *conn) { |
| 2762 | return conn->dcid.current.cid.datalen + NGTCP2_MIN_PKT_EXPANDLEN22; |
| 2763 | } |
| 2764 | |
| 2765 | /* |
| 2766 | * conn_write_pkt writes a protected packet in the buffer pointed by |
| 2767 | * |dest| whose length if |destlen|. |type| specifies the type of |
| 2768 | * packet. It can be NGTCP2_PKT_SHORT or NGTCP2_PKT_0RTT. |
| 2769 | * |
| 2770 | * This function can send new stream data. In order to send stream |
| 2771 | * data, specify the underlying stream and parameters to |
| 2772 | * |vmsg|->stream. If |vmsg|->stream.fin is set to nonzero, it |
| 2773 | * signals that the given data is the final portion of the stream. |
| 2774 | * |vmsg|->stream.data vector of length |vmsg|->stream.datacnt |
| 2775 | * specifies stream data to send. The number of bytes sent to the |
| 2776 | * stream is assigned to *|vmsg|->stream.pdatalen. If 0 length STREAM |
| 2777 | * data is sent, 0 is assigned to it. The caller should initialize |
| 2778 | * *|vmsg|->stream.pdatalen to -1. |
| 2779 | * |
| 2780 | * If |require_padding| is nonzero, padding bytes are added to occupy |
| 2781 | * the remaining packet payload. |
| 2782 | * |
| 2783 | * This function returns the number of bytes written in |dest| if it |
| 2784 | * succeeds, or one of the following negative error codes: |
| 2785 | * |
| 2786 | * NGTCP2_ERR_NOMEM |
| 2787 | * Out of memory. |
| 2788 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 2789 | * User-defined callback function failed. |
| 2790 | * NGTCP2_ERR_STREAM_DATA_BLOCKED |
| 2791 | * Stream data could not be written because of flow control. |
| 2792 | */ |
| 2793 | static ngtcp2_ssize conn_write_pkt(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, |
| 2794 | uint8_t *dest, size_t destlen, |
| 2795 | ngtcp2_vmsg *vmsg, uint8_t type, |
| 2796 | uint8_t flags, ngtcp2_tstamp ts) { |
| 2797 | int rv = 0; |
| 2798 | ngtcp2_crypto_cc *cc = &conn->pkt.cc; |
| 2799 | ngtcp2_ppe *ppe = &conn->pkt.ppe; |
| 2800 | ngtcp2_pkt_hd *hd = &conn->pkt.hd; |
| 2801 | ngtcp2_frame *ackfr = NULL((void*)0), lfr; |
| 2802 | ngtcp2_ssize nwrite; |
| 2803 | ngtcp2_frame_chain **pfrc, *nfrc, *frc; |
| 2804 | ngtcp2_rtb_entry *ent; |
| 2805 | ngtcp2_strm *strm; |
| 2806 | int pkt_empty = 1; |
| 2807 | size_t ndatalen = 0; |
| 2808 | int send_stream = 0; |
| 2809 | int stream_blocked = 0; |
| 2810 | int send_datagram = 0; |
| 2811 | ngtcp2_pktns *pktns = &conn->pktns; |
| 2812 | size_t left; |
| 2813 | size_t datalen = 0; |
| 2814 | ngtcp2_vec data[NGTCP2_MAX_STREAM_DATACNT256]; |
| 2815 | size_t datacnt; |
| 2816 | uint8_t rtb_entry_flags = NGTCP2_RTB_ENTRY_FLAG_NONE0x00; |
| 2817 | int hd_logged = 0; |
| 2818 | ngtcp2_path_challenge_entry *pcent; |
| 2819 | uint8_t hd_flags; |
| 2820 | int require_padding = (flags & NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING0x01) != 0; |
| 2821 | int write_more = (flags & NGTCP2_WRITE_PKT_FLAG_MORE0x02) != 0; |
| 2822 | int ppe_pending = (conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING0x1000) != 0; |
| 2823 | size_t min_pktlen = conn_min_short_pktlen(conn); |
| 2824 | int padded = 0; |
| 2825 | int credit_expanded = 0; |
| 2826 | ngtcp2_cc_pkt cc_pkt; |
| 2827 | uint64_t crypto_offset; |
| 2828 | uint64_t stream_offset; |
| 2829 | ngtcp2_ssize num_reclaimed; |
| 2830 | int fin; |
| 2831 | uint64_t target_max_data; |
| 2832 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 2833 | uint64_t delta; |
| 2834 | |
| 2835 | /* Return 0 if destlen is less than minimum packet length which can |
| 2836 | trigger Stateless Reset */ |
| 2837 | if (destlen < min_pktlen) { |
| 2838 | return 0; |
| 2839 | } |
| 2840 | |
| 2841 | if (vmsg) { |
| 2842 | switch (vmsg->type) { |
| 2843 | case NGTCP2_VMSG_TYPE_STREAM: |
| 2844 | datalen = ngtcp2_vec_len(vmsg->stream.data, vmsg->stream.datacnt); |
| 2845 | ndatalen = conn_enforce_flow_control(conn, vmsg->stream.strm, datalen); |
| 2846 | /* 0 length STREAM frame is allowed */ |
| 2847 | if (ndatalen || datalen == 0) { |
| 2848 | send_stream = 1; |
| 2849 | } else { |
| 2850 | stream_blocked = 1; |
| 2851 | } |
| 2852 | break; |
| 2853 | case NGTCP2_VMSG_TYPE_DATAGRAM: |
| 2854 | datalen = ngtcp2_vec_len(vmsg->datagram.data, vmsg->datagram.datacnt); |
| 2855 | send_datagram = 1; |
| 2856 | break; |
| 2857 | default: |
| 2858 | break; |
| 2859 | } |
| 2860 | } |
| 2861 | |
| 2862 | if (!ppe_pending) { |
| 2863 | switch (type) { |
| 2864 | case NGTCP2_PKT_SHORT: |
| 2865 | hd_flags = |
| 2866 | (pktns->crypto.tx.ckm->flags & NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01) |
| 2867 | ? NGTCP2_PKT_FLAG_KEY_PHASE0x04 |
| 2868 | : NGTCP2_PKT_FLAG_NONE0; |
| 2869 | cc->aead = pktns->crypto.ctx.aead; |
| 2870 | cc->hp = pktns->crypto.ctx.hp; |
| 2871 | cc->ckm = pktns->crypto.tx.ckm; |
| 2872 | cc->hp_ctx = pktns->crypto.tx.hp_ctx; |
| 2873 | |
| 2874 | /* transport parameter is only valid after handshake completion |
| 2875 | which means we don't know how many connection ID that remote |
| 2876 | peer can accept before handshake completion. */ |
| 2877 | if (conn->oscid.datalen && |
| 2878 | (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 2879 | rv = conn_enqueue_new_connection_id(conn); |
| 2880 | if (rv != 0) { |
| 2881 | return rv; |
| 2882 | } |
| 2883 | } |
| 2884 | |
| 2885 | break; |
| 2886 | case NGTCP2_PKT_0RTT: |
| 2887 | assert(!conn->server)((void) (0)); |
| 2888 | if (!conn->early.ckm) { |
| 2889 | return 0; |
| 2890 | } |
| 2891 | hd_flags = NGTCP2_PKT_FLAG_LONG_FORM0x01; |
| 2892 | cc->aead = conn->early.ctx.aead; |
| 2893 | cc->hp = conn->early.ctx.hp; |
| 2894 | cc->ckm = conn->early.ckm; |
| 2895 | cc->hp_ctx = conn->early.hp_ctx; |
| 2896 | break; |
| 2897 | default: |
| 2898 | /* Unreachable */ |
| 2899 | assert(0)((void) (0)); |
| 2900 | } |
| 2901 | |
| 2902 | cc->encrypt = conn->callbacks.encrypt; |
| 2903 | cc->hp_mask = conn->callbacks.hp_mask; |
| 2904 | |
| 2905 | if (conn_should_send_max_data(conn)) { |
| 2906 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 2907 | if (rv != 0) { |
| 2908 | return rv; |
| 2909 | } |
| 2910 | |
| 2911 | if (conn->local.settings.max_window && |
| 2912 | conn->tx.last_max_data_ts != UINT64_MAX(18446744073709551615UL) && |
| 2913 | ts - conn->tx.last_max_data_ts < |
| 2914 | NGTCP2_FLOW_WINDOW_RTT_FACTOR2 * cstat->smoothed_rtt && |
| 2915 | conn->local.settings.max_window > conn->rx.window) { |
| 2916 | target_max_data = NGTCP2_FLOW_WINDOW_SCALING_FACTOR2 * conn->rx.window; |
| 2917 | if (target_max_data > conn->local.settings.max_window) { |
| 2918 | target_max_data = conn->local.settings.max_window; |
| 2919 | } |
| 2920 | |
| 2921 | delta = target_max_data - conn->rx.window; |
| 2922 | if (conn->rx.unsent_max_offset + delta > NGTCP2_MAX_VARINT((1ULL << 62) - 1)) { |
| 2923 | delta = NGTCP2_MAX_VARINT((1ULL << 62) - 1) - conn->rx.unsent_max_offset; |
| 2924 | } |
| 2925 | |
| 2926 | conn->rx.window = target_max_data; |
| 2927 | } else { |
| 2928 | delta = 0; |
| 2929 | } |
| 2930 | |
| 2931 | conn->tx.last_max_data_ts = ts; |
| 2932 | |
| 2933 | nfrc->fr.type = NGTCP2_FRAME_MAX_DATA; |
| 2934 | nfrc->fr.max_data.max_data = conn->rx.unsent_max_offset + delta; |
| 2935 | nfrc->next = pktns->tx.frq; |
| 2936 | pktns->tx.frq = nfrc; |
| 2937 | |
| 2938 | conn->rx.max_offset = conn->rx.unsent_max_offset = |
| 2939 | nfrc->fr.max_data.max_data; |
| 2940 | credit_expanded = 1; |
| 2941 | } |
| 2942 | |
| 2943 | ngtcp2_pkt_hd_init(hd, hd_flags, type, &conn->dcid.current.cid, |
| 2944 | &conn->oscid, pktns->tx.last_pkt_num + 1, |
| 2945 | pktns_select_pkt_numlen(pktns), conn->version, 0); |
| 2946 | |
| 2947 | ngtcp2_ppe_init(ppe, dest, destlen, cc); |
| 2948 | |
| 2949 | rv = ngtcp2_ppe_encode_hd(ppe, hd); |
| 2950 | if (rv != 0) { |
| 2951 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 2952 | return 0; |
| 2953 | } |
| 2954 | |
| 2955 | if (!ngtcp2_ppe_ensure_hp_sample(ppe)) { |
| 2956 | return 0; |
| 2957 | } |
| 2958 | |
| 2959 | if (ngtcp2_ringbuf_len(&conn->rx.path_challenge)((&conn->rx.path_challenge)->len)) { |
| 2960 | pcent = ngtcp2_ringbuf_get(&conn->rx.path_challenge, 0); |
| 2961 | |
| 2962 | /* PATH_RESPONSE is bound to the path that the corresponding |
| 2963 | PATH_CHALLENGE is received. */ |
| 2964 | if (ngtcp2_path_eq(&conn->dcid.current.ps.path, &pcent->ps.path)) { |
| 2965 | lfr.type = NGTCP2_FRAME_PATH_RESPONSE; |
| 2966 | memcpy(lfr.path_response.data, pcent->data, |
| 2967 | sizeof(lfr.path_response.data)); |
| 2968 | |
| 2969 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &lfr); |
| 2970 | if (rv != 0) { |
| 2971 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 2972 | } else { |
| 2973 | ngtcp2_ringbuf_pop_front(&conn->rx.path_challenge); |
| 2974 | |
| 2975 | pkt_empty = 0; |
| 2976 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04; |
| 2977 | require_padding = !conn->server || destlen >= 1200; |
| 2978 | /* We don't retransmit PATH_RESPONSE. */ |
| 2979 | } |
| 2980 | } |
| 2981 | } |
| 2982 | |
| 2983 | rv = conn_create_ack_frame(conn, &ackfr, pktns, type, ts, |
| 2984 | conn_compute_ack_delay(conn), |
| 2985 | conn->local.transport_params.ack_delay_exponent); |
| 2986 | if (rv != 0) { |
| 2987 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 2988 | return rv; |
| 2989 | } |
| 2990 | |
| 2991 | if (ackfr) { |
| 2992 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, ackfr); |
| 2993 | if (rv != 0) { |
| 2994 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 2995 | } else { |
| 2996 | ngtcp2_acktr_commit_ack(&pktns->acktr); |
| 2997 | ngtcp2_acktr_add_ack(&pktns->acktr, hd->pkt_num, |
| 2998 | ackfr->ack.largest_ack); |
| 2999 | pkt_empty = 0; |
| 3000 | } |
| 3001 | } |
| 3002 | |
| 3003 | build_pkt: |
| 3004 | for (pfrc = &pktns->tx.frq; *pfrc;) { |
| 3005 | if ((*pfrc)->binder && |
| 3006 | ((*pfrc)->binder->flags & NGTCP2_FRAME_CHAIN_BINDER_FLAG_ACK0x01)) { |
| 3007 | frc = *pfrc; |
| 3008 | *pfrc = (*pfrc)->next; |
| 3009 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3010 | continue; |
| 3011 | } |
| 3012 | |
| 3013 | switch ((*pfrc)->fr.type) { |
| 3014 | case NGTCP2_FRAME_STOP_SENDING: |
| 3015 | strm = |
| 3016 | ngtcp2_conn_find_stream(conn, (*pfrc)->fr.stop_sending.stream_id); |
| 3017 | if (strm == NULL((void*)0) || (strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01)) { |
| 3018 | frc = *pfrc; |
| 3019 | *pfrc = (*pfrc)->next; |
| 3020 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3021 | continue; |
| 3022 | } |
| 3023 | break; |
| 3024 | case NGTCP2_FRAME_STREAM: |
| 3025 | assert(0)((void) (0)); |
| 3026 | break; |
| 3027 | case NGTCP2_FRAME_MAX_STREAMS_BIDI: |
| 3028 | if ((*pfrc)->fr.max_streams.max_streams < |
| 3029 | conn->remote.bidi.max_streams) { |
| 3030 | frc = *pfrc; |
| 3031 | *pfrc = (*pfrc)->next; |
| 3032 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3033 | continue; |
| 3034 | } |
| 3035 | break; |
| 3036 | case NGTCP2_FRAME_MAX_STREAMS_UNI: |
| 3037 | if ((*pfrc)->fr.max_streams.max_streams < |
| 3038 | conn->remote.uni.max_streams) { |
| 3039 | frc = *pfrc; |
| 3040 | *pfrc = (*pfrc)->next; |
| 3041 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3042 | continue; |
| 3043 | } |
| 3044 | break; |
| 3045 | case NGTCP2_FRAME_MAX_STREAM_DATA: |
| 3046 | strm = ngtcp2_conn_find_stream(conn, |
| 3047 | (*pfrc)->fr.max_stream_data.stream_id); |
| 3048 | if (strm == NULL((void*)0) || (strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) || |
| 3049 | (*pfrc)->fr.max_stream_data.max_stream_data < strm->rx.max_offset) { |
| 3050 | frc = *pfrc; |
| 3051 | *pfrc = (*pfrc)->next; |
| 3052 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3053 | continue; |
| 3054 | } |
| 3055 | break; |
| 3056 | case NGTCP2_FRAME_MAX_DATA: |
| 3057 | if ((*pfrc)->fr.max_data.max_data < conn->rx.max_offset) { |
| 3058 | frc = *pfrc; |
| 3059 | *pfrc = (*pfrc)->next; |
| 3060 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 3061 | continue; |
| 3062 | } |
| 3063 | break; |
| 3064 | case NGTCP2_FRAME_RETIRE_CONNECTION_ID: |
| 3065 | ++conn->dcid.num_retire_queued; |
| 3066 | break; |
| 3067 | case NGTCP2_FRAME_CRYPTO: |
| 3068 | assert(0)((void) (0)); |
| 3069 | break; |
| 3070 | } |
| 3071 | |
| 3072 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &(*pfrc)->fr); |
| 3073 | if (rv != 0) { |
| 3074 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3075 | break; |
| 3076 | } |
| 3077 | |
| 3078 | pkt_empty = 0; |
| 3079 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3080 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3081 | pfrc = &(*pfrc)->next; |
| 3082 | } |
| 3083 | |
| 3084 | if (rv != NGTCP2_ERR_NOBUF-203) { |
| 3085 | for (; ngtcp2_ksl_len(&pktns->crypto.tx.frq);) { |
| 3086 | left = ngtcp2_ppe_left(ppe); |
| 3087 | |
| 3088 | crypto_offset = conn_cryptofrq_unacked_offset(conn, pktns); |
| 3089 | if (crypto_offset == (size_t)-1) { |
| 3090 | conn_cryptofrq_clear(conn, pktns); |
| 3091 | break; |
| 3092 | } |
| 3093 | |
| 3094 | left = ngtcp2_pkt_crypto_max_datalen(crypto_offset, left, left); |
| 3095 | |
| 3096 | if (left == (size_t)-1) { |
| 3097 | break; |
| 3098 | } |
| 3099 | |
| 3100 | rv = conn_cryptofrq_pop(conn, &nfrc, pktns, left); |
| 3101 | if (rv != 0) { |
| 3102 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3103 | return rv; |
| 3104 | } |
| 3105 | |
| 3106 | if (nfrc == NULL((void*)0)) { |
| 3107 | break; |
| 3108 | } |
| 3109 | |
| 3110 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &nfrc->fr); |
| 3111 | if (rv != 0) { |
| 3112 | assert(0)((void) (0)); |
| 3113 | } |
| 3114 | |
| 3115 | *pfrc = nfrc; |
| 3116 | pfrc = &(*pfrc)->next; |
| 3117 | |
| 3118 | pkt_empty = 0; |
| 3119 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3120 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3121 | } |
| 3122 | } |
| 3123 | |
| 3124 | /* Write MAX_STREAM_ID after RESET_STREAM so that we can extend stream |
| 3125 | ID space in one packet. */ |
| 3126 | if (rv != NGTCP2_ERR_NOBUF-203 && *pfrc == NULL((void*)0) && |
| 3127 | conn->remote.bidi.unsent_max_streams > conn->remote.bidi.max_streams) { |
| 3128 | rv = conn_call_extend_max_remote_streams_bidi( |
| 3129 | conn, conn->remote.bidi.unsent_max_streams); |
| 3130 | if (rv != 0) { |
| 3131 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3132 | return rv; |
| 3133 | } |
| 3134 | |
| 3135 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 3136 | if (rv != 0) { |
| 3137 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3138 | return rv; |
| 3139 | } |
| 3140 | nfrc->fr.type = NGTCP2_FRAME_MAX_STREAMS_BIDI; |
| 3141 | nfrc->fr.max_streams.max_streams = conn->remote.bidi.unsent_max_streams; |
| 3142 | *pfrc = nfrc; |
| 3143 | |
| 3144 | conn->remote.bidi.max_streams = conn->remote.bidi.unsent_max_streams; |
| 3145 | |
| 3146 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &(*pfrc)->fr); |
| 3147 | if (rv != 0) { |
| 3148 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3149 | } else { |
| 3150 | pkt_empty = 0; |
| 3151 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3152 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3153 | pfrc = &(*pfrc)->next; |
| 3154 | } |
| 3155 | } |
| 3156 | |
| 3157 | if (rv != NGTCP2_ERR_NOBUF-203 && *pfrc == NULL((void*)0)) { |
| 3158 | if (conn->remote.uni.unsent_max_streams > conn->remote.uni.max_streams) { |
| 3159 | rv = conn_call_extend_max_remote_streams_uni( |
| 3160 | conn, conn->remote.uni.unsent_max_streams); |
| 3161 | if (rv != 0) { |
| 3162 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3163 | return rv; |
| 3164 | } |
| 3165 | |
| 3166 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 3167 | if (rv != 0) { |
| 3168 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3169 | return rv; |
| 3170 | } |
| 3171 | nfrc->fr.type = NGTCP2_FRAME_MAX_STREAMS_UNI; |
| 3172 | nfrc->fr.max_streams.max_streams = conn->remote.uni.unsent_max_streams; |
| 3173 | *pfrc = nfrc; |
| 3174 | |
| 3175 | conn->remote.uni.max_streams = conn->remote.uni.unsent_max_streams; |
| 3176 | |
| 3177 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, |
| 3178 | &(*pfrc)->fr); |
| 3179 | if (rv != 0) { |
| 3180 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3181 | } else { |
| 3182 | pkt_empty = 0; |
| 3183 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3184 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3185 | pfrc = &(*pfrc)->next; |
| 3186 | } |
| 3187 | } |
| 3188 | } |
| 3189 | |
| 3190 | if (rv != NGTCP2_ERR_NOBUF-203) { |
| 3191 | for (; !ngtcp2_pq_empty(&conn->tx.strmq);) { |
| 3192 | strm = ngtcp2_conn_tx_strmq_top(conn); |
| 3193 | |
| 3194 | if (!(strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) && |
| 3195 | conn_should_send_max_stream_data(conn, strm)) { |
| 3196 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 3197 | if (rv != 0) { |
| 3198 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3199 | return rv; |
| 3200 | } |
| 3201 | |
| 3202 | if (conn->local.settings.max_stream_window && |
| 3203 | strm->tx.last_max_stream_data_ts != UINT64_MAX(18446744073709551615UL) && |
| 3204 | ts - strm->tx.last_max_stream_data_ts < |
| 3205 | NGTCP2_FLOW_WINDOW_RTT_FACTOR2 * cstat->smoothed_rtt && |
| 3206 | conn->local.settings.max_stream_window > strm->rx.window) { |
| 3207 | target_max_data = |
| 3208 | NGTCP2_FLOW_WINDOW_SCALING_FACTOR2 * strm->rx.window; |
| 3209 | if (target_max_data > conn->local.settings.max_stream_window) { |
| 3210 | target_max_data = conn->local.settings.max_stream_window; |
| 3211 | } |
| 3212 | |
| 3213 | delta = target_max_data - strm->rx.window; |
| 3214 | if (strm->rx.unsent_max_offset + delta > NGTCP2_MAX_VARINT((1ULL << 62) - 1)) { |
| 3215 | delta = NGTCP2_MAX_VARINT((1ULL << 62) - 1) - strm->rx.unsent_max_offset; |
| 3216 | } |
| 3217 | |
| 3218 | strm->rx.window = target_max_data; |
| 3219 | } else { |
| 3220 | delta = 0; |
| 3221 | } |
| 3222 | |
| 3223 | strm->tx.last_max_stream_data_ts = ts; |
| 3224 | |
| 3225 | nfrc->fr.type = NGTCP2_FRAME_MAX_STREAM_DATA; |
| 3226 | nfrc->fr.max_stream_data.stream_id = strm->stream_id; |
| 3227 | nfrc->fr.max_stream_data.max_stream_data = |
| 3228 | strm->rx.unsent_max_offset + delta; |
| 3229 | ngtcp2_list_insert(nfrc, pfrc)do { (nfrc)->next = *(pfrc); *(pfrc) = (nfrc); } while (0); |
| 3230 | |
| 3231 | rv = |
| 3232 | conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &nfrc->fr); |
| 3233 | if (rv != 0) { |
| 3234 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3235 | break; |
| 3236 | } |
| 3237 | |
| 3238 | pkt_empty = 0; |
| 3239 | credit_expanded = 1; |
| 3240 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3241 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3242 | pfrc = &(*pfrc)->next; |
| 3243 | strm->rx.max_offset = strm->rx.unsent_max_offset = |
| 3244 | nfrc->fr.max_stream_data.max_stream_data; |
| 3245 | } |
| 3246 | |
| 3247 | if (ngtcp2_strm_streamfrq_empty(strm)) { |
| 3248 | ngtcp2_conn_tx_strmq_pop(conn); |
| 3249 | continue; |
| 3250 | } |
| 3251 | |
| 3252 | stream_offset = ngtcp2_strm_streamfrq_unacked_offset(strm); |
| 3253 | if (stream_offset == (uint64_t)-1) { |
| 3254 | ngtcp2_strm_streamfrq_clear(strm); |
| 3255 | ngtcp2_conn_tx_strmq_pop(conn); |
| 3256 | continue; |
| 3257 | } |
| 3258 | |
| 3259 | left = ngtcp2_ppe_left(ppe); |
| 3260 | |
| 3261 | left = ngtcp2_pkt_stream_max_datalen(strm->stream_id, stream_offset, |
| 3262 | left, left); |
| 3263 | |
| 3264 | if (left == (size_t)-1) { |
| 3265 | break; |
| 3266 | } |
| 3267 | |
| 3268 | rv = ngtcp2_strm_streamfrq_pop(strm, &nfrc, left); |
| 3269 | if (rv != 0) { |
| 3270 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3271 | return rv; |
| 3272 | } |
| 3273 | |
| 3274 | if (nfrc == NULL((void*)0)) { |
| 3275 | /* TODO Why? */ |
| 3276 | break; |
| 3277 | } |
| 3278 | |
| 3279 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &nfrc->fr); |
| 3280 | if (rv != 0) { |
| 3281 | assert(0)((void) (0)); |
| 3282 | } |
| 3283 | |
| 3284 | *pfrc = nfrc; |
| 3285 | pfrc = &(*pfrc)->next; |
| 3286 | |
| 3287 | pkt_empty = 0; |
| 3288 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3289 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3290 | |
| 3291 | if (ngtcp2_strm_streamfrq_empty(strm)) { |
| 3292 | ngtcp2_conn_tx_strmq_pop(conn); |
| 3293 | continue; |
| 3294 | } |
| 3295 | |
| 3296 | ngtcp2_conn_tx_strmq_pop(conn); |
| 3297 | ++strm->cycle; |
| 3298 | rv = ngtcp2_conn_tx_strmq_push(conn, strm); |
| 3299 | if (rv != 0) { |
| 3300 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3301 | return rv; |
| 3302 | } |
| 3303 | } |
| 3304 | } |
| 3305 | |
| 3306 | /* Add ACK if MAX_DATA or MAX_STREAM_DATA frame is encoded to |
| 3307 | decrease packet count. */ |
| 3308 | if (ackfr == NULL((void*)0) && credit_expanded) { |
| 3309 | rv = conn_create_ack_frame( |
| 3310 | conn, &ackfr, pktns, type, ts, /* ack_delay = */ 0, |
| 3311 | conn->local.transport_params.ack_delay_exponent); |
| 3312 | if (rv != 0) { |
| 3313 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3314 | return rv; |
| 3315 | } |
| 3316 | |
| 3317 | if (ackfr) { |
| 3318 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, ackfr); |
| 3319 | if (rv != 0) { |
| 3320 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3321 | } else { |
| 3322 | ngtcp2_acktr_commit_ack(&pktns->acktr); |
| 3323 | ngtcp2_acktr_add_ack(&pktns->acktr, hd->pkt_num, |
| 3324 | ackfr->ack.largest_ack); |
| 3325 | } |
| 3326 | } |
| 3327 | } |
| 3328 | |
| 3329 | if (rv != NGTCP2_ERR_NOBUF-203 && !send_stream && !send_datagram && |
| 3330 | !(rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 3331 | pktns->rtb.num_retransmittable && pktns->tx.frq == NULL((void*)0) && |
| 3332 | pktns->rtb.probe_pkt_left) { |
| 3333 | num_reclaimed = ngtcp2_rtb_reclaim_on_pto(&pktns->rtb, conn, pktns, |
| 3334 | pktns->rtb.probe_pkt_left + 1); |
| 3335 | if (num_reclaimed < 0) { |
| 3336 | return rv; |
| 3337 | } |
| 3338 | if (num_reclaimed) { |
| 3339 | goto build_pkt; |
| 3340 | } |
| 3341 | |
| 3342 | /* We had pktns->rtb.num_retransmittable > 0 but the contents of |
| 3343 | those packets have been acknowledged (i.e., retransmission in |
| 3344 | another packet). In this case, we don't have to send any |
| 3345 | probe packet. */ |
| 3346 | if (pktns->rtb.num_retransmittable == 0) { |
| 3347 | pktns->rtb.probe_pkt_left = 0; |
| 3348 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 3349 | } |
| 3350 | } |
| 3351 | } else { |
| 3352 | pfrc = conn->pkt.pfrc; |
| 3353 | rtb_entry_flags |= conn->pkt.rtb_entry_flags; |
| 3354 | pkt_empty = conn->pkt.pkt_empty; |
| 3355 | hd_logged = conn->pkt.hd_logged; |
| 3356 | } |
| 3357 | |
| 3358 | left = ngtcp2_ppe_left(ppe); |
| 3359 | |
| 3360 | if (rv != NGTCP2_ERR_NOBUF-203 && send_stream && *pfrc == NULL((void*)0) && |
| 3361 | (ndatalen = ngtcp2_pkt_stream_max_datalen( |
| 3362 | vmsg->stream.strm->stream_id, vmsg->stream.strm->tx.offset, ndatalen, |
| 3363 | left)) != (size_t)-1 && |
| 3364 | (ndatalen || datalen == 0)) { |
| 3365 | datacnt = ngtcp2_vec_copy_at_most( |
| 3366 | data, &ndatalen, NGTCP2_MAX_STREAM_DATACNT256, vmsg->stream.data, |
| 3367 | vmsg->stream.datacnt, ndatalen); |
| 3368 | |
| 3369 | rv = ngtcp2_frame_chain_stream_datacnt_new(&nfrc, datacnt, conn->mem); |
| 3370 | if (rv != 0) { |
| 3371 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3372 | return rv; |
| 3373 | } |
| 3374 | |
| 3375 | nfrc->fr.stream.type = NGTCP2_FRAME_STREAM; |
| 3376 | nfrc->fr.stream.flags = 0; |
| 3377 | nfrc->fr.stream.stream_id = vmsg->stream.strm->stream_id; |
| 3378 | nfrc->fr.stream.offset = vmsg->stream.strm->tx.offset; |
| 3379 | nfrc->fr.stream.datacnt = datacnt; |
| 3380 | ngtcp2_vec_copy(nfrc->fr.stream.data, data, datacnt); |
| 3381 | |
| 3382 | fin = (vmsg->stream.flags & NGTCP2_WRITE_STREAM_FLAG_FIN0x02) && |
| 3383 | ndatalen == datalen; |
| 3384 | nfrc->fr.stream.fin = (uint8_t)fin; |
| 3385 | |
| 3386 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &nfrc->fr); |
| 3387 | if (rv != 0) { |
| 3388 | assert(0)((void) (0)); |
| 3389 | } |
| 3390 | |
| 3391 | *pfrc = nfrc; |
| 3392 | pfrc = &(*pfrc)->next; |
| 3393 | |
| 3394 | pkt_empty = 0; |
| 3395 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04 | |
| 3396 | NGTCP2_RTB_ENTRY_FLAG_RETRANSMITTABLE0x02; |
| 3397 | |
| 3398 | vmsg->stream.strm->tx.offset += ndatalen; |
| 3399 | conn->tx.offset += ndatalen; |
| 3400 | |
| 3401 | if (fin) { |
| 3402 | ngtcp2_strm_shutdown(vmsg->stream.strm, NGTCP2_STRM_FLAG_SHUT_WR0x02); |
| 3403 | } |
| 3404 | |
| 3405 | if (vmsg->stream.pdatalen) { |
| 3406 | *vmsg->stream.pdatalen = (ngtcp2_ssize)ndatalen; |
| 3407 | } |
| 3408 | } else { |
| 3409 | send_stream = 0; |
| 3410 | } |
| 3411 | |
| 3412 | if (rv != NGTCP2_ERR_NOBUF-203 && send_datagram && |
| 3413 | left >= ngtcp2_pkt_datagram_framelen(datalen)) { |
| 3414 | lfr.datagram.type = NGTCP2_FRAME_DATAGRAM_LEN; |
| 3415 | lfr.datagram.datacnt = vmsg->datagram.datacnt; |
| 3416 | lfr.datagram.data = (ngtcp2_vec *)vmsg->datagram.data; |
| 3417 | |
| 3418 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &lfr); |
| 3419 | assert(rv == 0)((void) (0)); |
| 3420 | |
| 3421 | pkt_empty = 0; |
| 3422 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04; |
| 3423 | |
| 3424 | if (vmsg->datagram.paccepted) { |
| 3425 | *vmsg->datagram.paccepted = 1; |
| 3426 | } |
| 3427 | } else { |
| 3428 | send_datagram = 0; |
| 3429 | } |
| 3430 | |
| 3431 | if (pkt_empty) { |
| 3432 | assert(rv == 0 || NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3433 | if (rv == 0 && stream_blocked && ngtcp2_conn_get_max_data_left(conn)) { |
| 3434 | return NGTCP2_ERR_STREAM_DATA_BLOCKED-210; |
| 3435 | } |
| 3436 | |
| 3437 | if (conn->pktns.rtb.probe_pkt_left == 0) { |
| 3438 | return 0; |
| 3439 | } |
| 3440 | } else if (write_more) { |
| 3441 | conn->pkt.pfrc = pfrc; |
| 3442 | conn->pkt.pkt_empty = pkt_empty; |
| 3443 | conn->pkt.rtb_entry_flags = rtb_entry_flags; |
| 3444 | conn->pkt.hd_logged = hd_logged; |
| 3445 | conn->flags |= NGTCP2_CONN_FLAG_PPE_PENDING0x1000; |
| 3446 | |
| 3447 | assert(vmsg)((void) (0)); |
| 3448 | |
| 3449 | switch (vmsg->type) { |
| 3450 | case NGTCP2_VMSG_TYPE_STREAM: |
| 3451 | if (send_stream) { |
| 3452 | if (ngtcp2_ppe_left(ppe)) { |
| 3453 | return NGTCP2_ERR_WRITE_MORE-240; |
| 3454 | } |
| 3455 | } else if (ngtcp2_conn_get_max_data_left(conn) && stream_blocked) { |
| 3456 | return NGTCP2_ERR_STREAM_DATA_BLOCKED-210; |
| 3457 | } |
| 3458 | break; |
| 3459 | case NGTCP2_VMSG_TYPE_DATAGRAM: |
| 3460 | if (send_datagram && ngtcp2_ppe_left(ppe)) { |
| 3461 | return NGTCP2_ERR_WRITE_MORE-240; |
| 3462 | } |
| 3463 | /* If DATAGRAM cannot be written due to insufficient space, |
| 3464 | continue to create a packet with the hope that application |
| 3465 | calls ngtcp2_conn_writev_datagram again. */ |
| 3466 | break; |
| 3467 | default: |
| 3468 | assert(0)((void) (0)); |
| 3469 | } |
| 3470 | } |
| 3471 | |
| 3472 | if (!(rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04)) { |
| 3473 | if (pktns->tx.num_non_ack_pkt >= NGTCP2_MAX_NON_ACK_TX_PKT3) { |
| 3474 | lfr.type = NGTCP2_FRAME_PING; |
| 3475 | |
| 3476 | rv = conn_ppe_write_frame_hd_log(conn, ppe, &hd_logged, hd, &lfr); |
| 3477 | if (rv != 0) { |
| 3478 | assert(rv == NGTCP2_ERR_NOBUF)((void) (0)); |
| 3479 | /* TODO If buffer is too small, PING cannot be written if |
| 3480 | packet is still empty. */ |
| 3481 | } else { |
| 3482 | rtb_entry_flags |= NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04; |
| 3483 | pktns->tx.num_non_ack_pkt = 0; |
| 3484 | } |
| 3485 | } else { |
| 3486 | ++pktns->tx.num_non_ack_pkt; |
| 3487 | } |
| 3488 | } else { |
| 3489 | pktns->tx.num_non_ack_pkt = 0; |
| 3490 | } |
| 3491 | |
| 3492 | /* TODO Push STREAM frame back to ngtcp2_strm if there is an error |
| 3493 | before ngtcp2_rtb_entry is safely created and added. */ |
| 3494 | lfr.type = NGTCP2_FRAME_PADDING; |
| 3495 | if ((require_padding || |
| 3496 | /* Making full sized packet will help GSO a bit */ |
| 3497 | ngtcp2_ppe_left(ppe) < 10 || |
| 3498 | (type == NGTCP2_PKT_0RTT && conn->state == NGTCP2_CS_CLIENT_INITIAL)) && |
| 3499 | ngtcp2_ppe_left(ppe)) { |
| 3500 | lfr.padding.len = ngtcp2_ppe_padding(ppe); |
| 3501 | } else { |
| 3502 | lfr.padding.len = ngtcp2_ppe_padding_size(ppe, min_pktlen); |
| 3503 | } |
| 3504 | |
| 3505 | if (lfr.padding.len) { |
| 3506 | padded = 1; |
| 3507 | ngtcp2_log_tx_fr(&conn->log, hd, &lfr); |
| 3508 | ngtcp2_qlog_write_frame(&conn->qlog, &lfr); |
| 3509 | } |
| 3510 | |
| 3511 | nwrite = ngtcp2_ppe_final(ppe, NULL((void*)0)); |
| 3512 | if (nwrite < 0) { |
| 3513 | assert(ngtcp2_err_is_fatal((int)nwrite))((void) (0)); |
| 3514 | return nwrite; |
| 3515 | } |
| 3516 | |
| 3517 | ++cc->ckm->use_count; |
| 3518 | |
| 3519 | ngtcp2_qlog_pkt_sent_end(&conn->qlog, hd, (size_t)nwrite); |
| 3520 | |
| 3521 | /* TODO ack-eliciting vs needs-tracking */ |
| 3522 | /* probe packet needs tracking but it does not need ACK, could be lost. */ |
| 3523 | if ((rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) || padded) { |
| 3524 | if (pi) { |
| 3525 | conn_handle_tx_ecn(conn, pi, &rtb_entry_flags, pktns, hd, ts); |
| 3526 | } |
| 3527 | |
| 3528 | rv = ngtcp2_rtb_entry_new(&ent, hd, NULL((void*)0), ts, (size_t)nwrite, |
| 3529 | rtb_entry_flags, conn->mem); |
| 3530 | if (rv != 0) { |
| 3531 | assert(ngtcp2_err_is_fatal((int)nwrite))((void) (0)); |
| 3532 | return rv; |
| 3533 | } |
| 3534 | |
| 3535 | if (*pfrc != pktns->tx.frq) { |
| 3536 | ent->frc = pktns->tx.frq; |
| 3537 | pktns->tx.frq = *pfrc; |
| 3538 | *pfrc = NULL((void*)0); |
| 3539 | } |
| 3540 | |
| 3541 | if ((rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 3542 | pktns->rtb.num_ack_eliciting == 0 && conn->cc.event) { |
| 3543 | conn->cc.event(&conn->cc, &conn->cstat, NGTCP2_CC_EVENT_TYPE_TX_START, |
| 3544 | ts); |
| 3545 | } |
| 3546 | |
| 3547 | rv = conn_on_pkt_sent(conn, &pktns->rtb, ent); |
| 3548 | if (rv != 0) { |
| 3549 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 3550 | ngtcp2_rtb_entry_del(ent, conn->mem); |
| 3551 | return rv; |
| 3552 | } |
| 3553 | |
| 3554 | if (rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) { |
| 3555 | if (conn->cc.on_pkt_sent) { |
| 3556 | conn->cc.on_pkt_sent( |
| 3557 | &conn->cc, &conn->cstat, |
| 3558 | ngtcp2_cc_pkt_init(&cc_pkt, hd->pkt_num, (size_t)nwrite, |
| 3559 | NGTCP2_PKTNS_ID_APPLICATION, ts)); |
| 3560 | } |
| 3561 | |
| 3562 | if (conn->flags & NGTCP2_CONN_FLAG_RESTART_IDLE_TIMER_ON_WRITE0x2000) { |
| 3563 | conn_restart_timer_on_write(conn, ts); |
| 3564 | } |
| 3565 | } |
| 3566 | } else if (pi && conn->tx.ecn.state == NGTCP2_ECN_STATE_CAPABLE) { |
| 3567 | conn_handle_tx_ecn(conn, pi, NULL((void*)0), pktns, hd, ts); |
| 3568 | } |
| 3569 | |
| 3570 | conn->flags &= (uint16_t)~NGTCP2_CONN_FLAG_PPE_PENDING0x1000; |
| 3571 | |
| 3572 | if (pktns->rtb.probe_pkt_left && |
| 3573 | (rtb_entry_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04)) { |
| 3574 | --pktns->rtb.probe_pkt_left; |
| 3575 | |
| 3576 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, "probe pkt size=%td", |
| 3577 | nwrite); |
| 3578 | } |
| 3579 | |
| 3580 | conn->dcid.current.bytes_sent += (uint64_t)nwrite; |
| 3581 | |
| 3582 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 3583 | |
| 3584 | ++pktns->tx.last_pkt_num; |
| 3585 | |
| 3586 | return nwrite; |
| 3587 | } |
| 3588 | |
| 3589 | ngtcp2_ssize ngtcp2_conn_write_single_frame_pkt( |
| 3590 | ngtcp2_conn *conn, ngtcp2_pkt_info *pi, uint8_t *dest, size_t destlen, |
| 3591 | uint8_t type, const ngtcp2_cid *dcid, ngtcp2_frame *fr, uint8_t rtb_flags, |
| 3592 | const ngtcp2_path *path, ngtcp2_tstamp ts) { |
| 3593 | int rv; |
| 3594 | ngtcp2_ppe ppe; |
| 3595 | ngtcp2_pkt_hd hd; |
| 3596 | ngtcp2_frame lfr; |
| 3597 | ngtcp2_ssize nwrite; |
| 3598 | ngtcp2_crypto_cc cc; |
| 3599 | ngtcp2_pktns *pktns; |
| 3600 | uint8_t flags; |
| 3601 | ngtcp2_rtb_entry *rtbent; |
| 3602 | int padded = 0; |
| 3603 | |
| 3604 | switch (type) { |
| 3605 | case NGTCP2_PKT_INITIAL: |
| 3606 | pktns = conn->in_pktns; |
| 3607 | flags = NGTCP2_PKT_FLAG_LONG_FORM0x01; |
| 3608 | break; |
| 3609 | case NGTCP2_PKT_HANDSHAKE: |
| 3610 | pktns = conn->hs_pktns; |
| 3611 | flags = NGTCP2_PKT_FLAG_LONG_FORM0x01; |
| 3612 | break; |
| 3613 | case NGTCP2_PKT_SHORT: |
| 3614 | /* 0 means Short packet. */ |
| 3615 | pktns = &conn->pktns; |
| 3616 | flags = (pktns->crypto.tx.ckm->flags & NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01) |
| 3617 | ? NGTCP2_PKT_FLAG_KEY_PHASE0x04 |
| 3618 | : NGTCP2_PKT_FLAG_NONE0; |
| 3619 | break; |
| 3620 | default: |
| 3621 | /* We don't support 0-RTT packet in this function. */ |
| 3622 | assert(0)((void) (0)); |
| 3623 | } |
| 3624 | |
| 3625 | cc.aead = pktns->crypto.ctx.aead; |
| 3626 | cc.hp = pktns->crypto.ctx.hp; |
| 3627 | cc.ckm = pktns->crypto.tx.ckm; |
| 3628 | cc.hp_ctx = pktns->crypto.tx.hp_ctx; |
| 3629 | cc.encrypt = conn->callbacks.encrypt; |
| 3630 | cc.hp_mask = conn->callbacks.hp_mask; |
| 3631 | |
| 3632 | ngtcp2_pkt_hd_init(&hd, flags, type, dcid, &conn->oscid, |
| 3633 | pktns->tx.last_pkt_num + 1, pktns_select_pkt_numlen(pktns), |
| 3634 | conn->version, 0); |
| 3635 | |
| 3636 | ngtcp2_ppe_init(&ppe, dest, destlen, &cc); |
| 3637 | |
| 3638 | rv = ngtcp2_ppe_encode_hd(&ppe, &hd); |
| 3639 | if (rv != 0) { |
| 3640 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3641 | return 0; |
| 3642 | } |
| 3643 | |
| 3644 | if (!ngtcp2_ppe_ensure_hp_sample(&ppe)) { |
| 3645 | return 0; |
| 3646 | } |
| 3647 | |
| 3648 | ngtcp2_log_tx_pkt_hd(&conn->log, &hd); |
| 3649 | ngtcp2_qlog_pkt_sent_start(&conn->qlog); |
| 3650 | |
| 3651 | rv = conn_ppe_write_frame(conn, &ppe, &hd, fr); |
| 3652 | if (rv != 0) { |
| 3653 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 3654 | return 0; |
| 3655 | } |
| 3656 | |
| 3657 | lfr.type = NGTCP2_FRAME_PADDING; |
| 3658 | switch (fr->type) { |
| 3659 | case NGTCP2_FRAME_PATH_CHALLENGE: |
| 3660 | case NGTCP2_FRAME_PATH_RESPONSE: |
| 3661 | if (!conn->server || destlen >= 1200) { |
| 3662 | lfr.padding.len = ngtcp2_ppe_padding(&ppe); |
| 3663 | } else { |
| 3664 | lfr.padding.len = 0; |
| 3665 | } |
| 3666 | break; |
| 3667 | default: |
| 3668 | if (type == NGTCP2_PKT_SHORT) { |
| 3669 | lfr.padding.len = |
| 3670 | ngtcp2_ppe_padding_size(&ppe, conn_min_short_pktlen(conn)); |
| 3671 | } else { |
| 3672 | lfr.padding.len = ngtcp2_ppe_padding_hp_sample(&ppe); |
| 3673 | } |
| 3674 | } |
| 3675 | if (lfr.padding.len) { |
| 3676 | padded = 1; |
| 3677 | ngtcp2_log_tx_fr(&conn->log, &hd, &lfr); |
| 3678 | ngtcp2_qlog_write_frame(&conn->qlog, &lfr); |
| 3679 | } |
| 3680 | |
| 3681 | nwrite = ngtcp2_ppe_final(&ppe, NULL((void*)0)); |
| 3682 | if (nwrite < 0) { |
| 3683 | return nwrite; |
| 3684 | } |
| 3685 | |
| 3686 | if (type == NGTCP2_PKT_SHORT) { |
| 3687 | ++cc.ckm->use_count; |
| 3688 | } |
| 3689 | |
| 3690 | ngtcp2_qlog_pkt_sent_end(&conn->qlog, &hd, (size_t)nwrite); |
| 3691 | |
| 3692 | /* Do this when we are sure that there is no error. */ |
| 3693 | switch (fr->type) { |
| 3694 | case NGTCP2_FRAME_ACK: |
| 3695 | case NGTCP2_FRAME_ACK_ECN: |
| 3696 | ngtcp2_acktr_commit_ack(&pktns->acktr); |
| 3697 | ngtcp2_acktr_add_ack(&pktns->acktr, hd.pkt_num, fr->ack.largest_ack); |
| 3698 | break; |
| 3699 | } |
| 3700 | |
| 3701 | if (((rtb_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) || padded) && |
| 3702 | (!path || ngtcp2_path_eq(&conn->dcid.current.ps.path, path))) { |
| 3703 | if (pi) { |
| 3704 | conn_handle_tx_ecn(conn, pi, &rtb_flags, pktns, &hd, ts); |
| 3705 | } |
| 3706 | |
| 3707 | rv = ngtcp2_rtb_entry_new(&rtbent, &hd, NULL((void*)0), ts, (size_t)nwrite, rtb_flags, |
| 3708 | conn->mem); |
| 3709 | if (rv != 0) { |
| 3710 | return rv; |
| 3711 | } |
| 3712 | |
| 3713 | rv = conn_on_pkt_sent(conn, &pktns->rtb, rtbent); |
| 3714 | if (rv != 0) { |
| 3715 | ngtcp2_rtb_entry_del(rtbent, conn->mem); |
| 3716 | return rv; |
| 3717 | } |
| 3718 | |
| 3719 | if ((rtb_flags & NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04) && |
| 3720 | (conn->flags & NGTCP2_CONN_FLAG_RESTART_IDLE_TIMER_ON_WRITE0x2000)) { |
| 3721 | conn_restart_timer_on_write(conn, ts); |
| 3722 | } |
| 3723 | } else if (pi && conn->tx.ecn.state == NGTCP2_ECN_STATE_CAPABLE) { |
| 3724 | conn_handle_tx_ecn(conn, pi, NULL((void*)0), pktns, &hd, ts); |
| 3725 | } |
| 3726 | |
| 3727 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 3728 | |
| 3729 | ++pktns->tx.last_pkt_num; |
| 3730 | |
| 3731 | return nwrite; |
| 3732 | } |
| 3733 | |
| 3734 | /* |
| 3735 | * conn_process_early_rtb makes any pending 0RTT packet Short packet. |
| 3736 | */ |
| 3737 | static void conn_process_early_rtb(ngtcp2_conn *conn) { |
| 3738 | ngtcp2_rtb_entry *ent; |
| 3739 | ngtcp2_rtb *rtb = &conn->pktns.rtb; |
| 3740 | ngtcp2_ksl_it it; |
| 3741 | |
| 3742 | for (it = ngtcp2_rtb_head(rtb); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 3743 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 3744 | ent = ngtcp2_ksl_it_get(&it); |
| 3745 | |
| 3746 | if ((ent->hd.flags & NGTCP2_PKT_FLAG_LONG_FORM0x01) == 0 || |
| 3747 | ent->hd.type != NGTCP2_PKT_0RTT) { |
| 3748 | continue; |
| 3749 | } |
| 3750 | |
| 3751 | /* 0-RTT packet is retransmitted as a Short packet. */ |
| 3752 | ent->hd.flags &= (uint8_t)~NGTCP2_PKT_FLAG_LONG_FORM0x01; |
| 3753 | ent->hd.type = NGTCP2_PKT_SHORT; |
| 3754 | } |
| 3755 | } |
| 3756 | |
| 3757 | /* |
| 3758 | * conn_handshake_remnants_left returns nonzero if there may be |
| 3759 | * handshake packets the local endpoint has to send, including new |
| 3760 | * packets and lost ones. |
| 3761 | */ |
| 3762 | static int conn_handshake_remnants_left(ngtcp2_conn *conn) { |
| 3763 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 3764 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 3765 | |
| 3766 | return !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) || |
| 3767 | (in_pktns && (in_pktns->rtb.num_retransmittable || |
| 3768 | ngtcp2_ksl_len(&in_pktns->crypto.tx.frq))) || |
| 3769 | (hs_pktns && (hs_pktns->rtb.num_retransmittable || |
| 3770 | ngtcp2_ksl_len(&hs_pktns->crypto.tx.frq))); |
| 3771 | } |
| 3772 | |
| 3773 | /* |
| 3774 | * conn_retire_dcid_seq retires destination connection ID denoted by |
| 3775 | * |seq|. |
| 3776 | * |
| 3777 | * This function returns 0 if it succeeds, or one of the following |
| 3778 | * negative error codes: |
| 3779 | * |
| 3780 | * NGTCP2_ERR_NOMEM |
| 3781 | * Out of memory. |
| 3782 | */ |
| 3783 | static int conn_retire_dcid_seq(ngtcp2_conn *conn, uint64_t seq) { |
| 3784 | ngtcp2_pktns *pktns = &conn->pktns; |
| 3785 | ngtcp2_frame_chain *nfrc; |
| 3786 | int rv; |
| 3787 | |
| 3788 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 3789 | if (rv != 0) { |
| 3790 | return rv; |
| 3791 | } |
| 3792 | |
| 3793 | nfrc->fr.type = NGTCP2_FRAME_RETIRE_CONNECTION_ID; |
| 3794 | nfrc->fr.retire_connection_id.seq = seq; |
| 3795 | nfrc->next = pktns->tx.frq; |
| 3796 | pktns->tx.frq = nfrc; |
| 3797 | |
| 3798 | return 0; |
| 3799 | } |
| 3800 | |
| 3801 | /* |
| 3802 | * conn_retire_dcid retires |dcid|. |
| 3803 | * |
| 3804 | * This function returns 0 if it succeeds, or one of the following |
| 3805 | * negative error codes: |
| 3806 | * |
| 3807 | * NGTCP2_ERR_NOMEM |
| 3808 | * Out of memory |
| 3809 | */ |
| 3810 | static int conn_retire_dcid(ngtcp2_conn *conn, const ngtcp2_dcid *dcid, |
| 3811 | ngtcp2_tstamp ts) { |
| 3812 | ngtcp2_ringbuf *rb = &conn->dcid.retired; |
| 3813 | ngtcp2_dcid *dest, *stale_dcid; |
| 3814 | int rv; |
| 3815 | |
| 3816 | assert(dcid->cid.datalen)((void) (0)); |
| 3817 | |
| 3818 | if (ngtcp2_ringbuf_full(rb)) { |
| 3819 | stale_dcid = ngtcp2_ringbuf_get(rb, 0); |
| 3820 | rv = conn_call_deactivate_dcid(conn, stale_dcid); |
| 3821 | if (rv != 0) { |
| 3822 | return rv; |
| 3823 | } |
| 3824 | |
| 3825 | ngtcp2_ringbuf_pop_front(rb); |
| 3826 | } |
| 3827 | |
| 3828 | dest = ngtcp2_ringbuf_push_back(rb); |
| 3829 | ngtcp2_dcid_copy(dest, dcid); |
| 3830 | dest->ts_retired = ts; |
| 3831 | |
| 3832 | return conn_retire_dcid_seq(conn, dcid->seq); |
| 3833 | } |
| 3834 | |
| 3835 | /* |
| 3836 | * conn_bind_dcid stores the DCID to |*pdcid| bound to |path|. If |
| 3837 | * such DCID is not found, bind the new DCID to |path| and stores it |
| 3838 | * to |*pdcid|. If a remote endpoint uses zero-length connection ID, |
| 3839 | * the pointer to conn->dcid.current is assigned to |*pdcid|. |
| 3840 | * |
| 3841 | * This function returns 0 if it succeeds, or one of the following |
| 3842 | * negative error codes: |
| 3843 | * |
| 3844 | * NGTCP2_ERR_CONN_ID_BLOCKED |
| 3845 | * No unused DCID is available |
| 3846 | * NGTCP2_ERR_NOMEM |
| 3847 | * Out of memory |
| 3848 | */ |
| 3849 | static int conn_bind_dcid(ngtcp2_conn *conn, ngtcp2_dcid **pdcid, |
| 3850 | const ngtcp2_path *path, ngtcp2_tstamp ts) { |
| 3851 | ngtcp2_pv *pv = conn->pv; |
| 3852 | ngtcp2_dcid *dcid, *ndcid; |
| 3853 | ngtcp2_cid cid; |
| 3854 | size_t i, len; |
| 3855 | int rv; |
| 3856 | |
| 3857 | assert(!ngtcp2_path_eq(&conn->dcid.current.ps.path, path))((void) (0)); |
| 3858 | assert(!pv || !ngtcp2_path_eq(&pv->dcid.ps.path, path))((void) (0)); |
| 3859 | assert(!pv || !(pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE) ||((void) (0)) |
| 3860 | !ngtcp2_path_eq(&pv->fallback_dcid.ps.path, path))((void) (0)); |
| 3861 | |
| 3862 | len = ngtcp2_ringbuf_len(&conn->dcid.bound)((&conn->dcid.bound)->len); |
| 3863 | for (i = 0; i < len; ++i) { |
| 3864 | dcid = ngtcp2_ringbuf_get(&conn->dcid.bound, i); |
| 3865 | |
| 3866 | if (ngtcp2_path_eq(&dcid->ps.path, path)) { |
| 3867 | *pdcid = dcid; |
| 3868 | return 0; |
| 3869 | } |
| 3870 | } |
| 3871 | |
| 3872 | if (conn->dcid.current.cid.datalen == 0) { |
| 3873 | ndcid = ngtcp2_ringbuf_push_back(&conn->dcid.bound); |
| 3874 | ngtcp2_cid_zero(&cid); |
| 3875 | ngtcp2_dcid_init(ndcid, ++conn->dcid.zerolen_seq, &cid, NULL((void*)0)); |
| 3876 | ngtcp2_path_copy(&ndcid->ps.path, path); |
| 3877 | |
| 3878 | *pdcid = ndcid; |
| 3879 | |
| 3880 | return 0; |
| 3881 | } |
| 3882 | |
| 3883 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len) == 0) { |
| 3884 | return NGTCP2_ERR_CONN_ID_BLOCKED-237; |
| 3885 | } |
| 3886 | |
| 3887 | if (ngtcp2_ringbuf_full(&conn->dcid.bound)) { |
| 3888 | dcid = ngtcp2_ringbuf_get(&conn->dcid.bound, 0); |
| 3889 | rv = conn_retire_dcid(conn, dcid, ts); |
| 3890 | if (rv != 0) { |
| 3891 | return rv; |
| 3892 | } |
| 3893 | } |
| 3894 | |
| 3895 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 3896 | ndcid = ngtcp2_ringbuf_push_back(&conn->dcid.bound); |
| 3897 | |
| 3898 | ngtcp2_dcid_copy(ndcid, dcid); |
| 3899 | ngtcp2_path_copy(&ndcid->ps.path, path); |
| 3900 | |
| 3901 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 3902 | |
| 3903 | *pdcid = ndcid; |
| 3904 | |
| 3905 | return 0; |
| 3906 | } |
| 3907 | |
| 3908 | /* |
| 3909 | * conn_stop_pv stops the path validation which is currently running. |
| 3910 | * This function does nothing if no path validation is currently being |
| 3911 | * performed. |
| 3912 | * |
| 3913 | * This function returns 0 if it succeeds, or one of the following |
| 3914 | * negative error codes: |
| 3915 | * |
| 3916 | * NGTCP2_ERR_NOMEM |
| 3917 | * Out of memory |
| 3918 | */ |
| 3919 | static int conn_stop_pv(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 3920 | int rv = 0; |
| 3921 | ngtcp2_pv *pv = conn->pv; |
| 3922 | |
| 3923 | if (pv == NULL((void*)0)) { |
| 3924 | return 0; |
| 3925 | } |
| 3926 | |
| 3927 | if (pv->dcid.cid.datalen && pv->dcid.seq != conn->dcid.current.seq) { |
| 3928 | rv = conn_retire_dcid(conn, &pv->dcid, ts); |
| 3929 | if (rv != 0) { |
| 3930 | goto fin; |
| 3931 | } |
| 3932 | } |
| 3933 | |
| 3934 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 3935 | pv->fallback_dcid.cid.datalen && |
| 3936 | pv->fallback_dcid.seq != conn->dcid.current.seq && |
| 3937 | pv->fallback_dcid.seq != pv->dcid.seq) { |
| 3938 | rv = conn_retire_dcid(conn, &pv->fallback_dcid, ts); |
| 3939 | if (rv != 0) { |
| 3940 | goto fin; |
| 3941 | } |
| 3942 | } |
| 3943 | |
| 3944 | fin: |
| 3945 | ngtcp2_pv_del(pv); |
| 3946 | conn->pv = NULL((void*)0); |
| 3947 | |
| 3948 | return rv; |
| 3949 | } |
| 3950 | |
| 3951 | static void conn_reset_congestion_state(ngtcp2_conn *conn); |
| 3952 | |
| 3953 | /* |
| 3954 | * conn_on_path_validation_failed is called when path validation |
| 3955 | * fails. This function may delete |pv|. |
| 3956 | * |
| 3957 | * This function returns 0 if it succeeds, or one of the following |
| 3958 | * negative error codes: |
| 3959 | * |
| 3960 | * NGTCP2_ERR_NOMEM |
| 3961 | * Out of memory |
| 3962 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 3963 | * User-defined callback function failed. |
| 3964 | */ |
| 3965 | static int conn_on_path_validation_failed(ngtcp2_conn *conn, ngtcp2_pv *pv, |
| 3966 | ngtcp2_tstamp ts) { |
| 3967 | int rv; |
| 3968 | |
| 3969 | rv = conn_call_path_validation(conn, &pv->dcid.ps.path, |
| 3970 | NGTCP2_PATH_VALIDATION_RESULT_FAILURE); |
| 3971 | if (rv != 0) { |
| 3972 | return rv; |
| 3973 | } |
| 3974 | |
| 3975 | if (pv->flags & NGTCP2_PV_FLAG_MTU_PROBE0x08) { |
| 3976 | return NGTCP2_ERR_NO_VIABLE_PATH-244; |
| 3977 | } |
| 3978 | |
| 3979 | if (pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) { |
| 3980 | ngtcp2_dcid_copy(&conn->dcid.current, &pv->fallback_dcid); |
| 3981 | conn_reset_congestion_state(conn); |
| 3982 | } |
| 3983 | |
| 3984 | return conn_stop_pv(conn, ts); |
| 3985 | } |
| 3986 | |
| 3987 | /* |
| 3988 | * dcid_tx_left returns the maximum number of bytes that server is |
| 3989 | * allowed to send to an unvalidated path associated to |dcid|. |
| 3990 | */ |
| 3991 | static size_t dcid_tx_left(ngtcp2_dcid *dcid) { |
| 3992 | if (dcid->flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01) { |
| 3993 | return SIZE_MAX(18446744073709551615UL); |
| 3994 | } |
| 3995 | /* From QUIC spec: Prior to validating the client address, servers |
| 3996 | MUST NOT send more than three times as many bytes as the number |
| 3997 | of bytes they have received. */ |
| 3998 | assert(dcid->bytes_recv * 3 >= dcid->bytes_sent)((void) (0)); |
| 3999 | |
| 4000 | return dcid->bytes_recv * 3 - dcid->bytes_sent; |
| 4001 | } |
| 4002 | |
| 4003 | /* |
| 4004 | * conn_server_tx_left returns the maximum number of bytes that server |
| 4005 | * is allowed to send to an unvalidated path. |
| 4006 | */ |
| 4007 | static size_t conn_server_tx_left(ngtcp2_conn *conn, ngtcp2_dcid *dcid) { |
| 4008 | assert(conn->server)((void) (0)); |
| 4009 | |
| 4010 | /* If pv->dcid has the current path, use conn->dcid.current. This |
| 4011 | is because conn->dcid.current gets update for bytes_recv and |
| 4012 | bytes_sent. */ |
| 4013 | if (ngtcp2_path_eq(&dcid->ps.path, &conn->dcid.current.ps.path)) { |
| 4014 | return dcid_tx_left(&conn->dcid.current); |
| 4015 | } |
| 4016 | |
| 4017 | return dcid_tx_left(dcid); |
| 4018 | } |
| 4019 | |
| 4020 | /* |
| 4021 | * conn_write_path_challenge writes a packet which includes |
| 4022 | * PATH_CHALLENGE frame into |dest| of length |destlen|. |
| 4023 | * |
| 4024 | * This function returns the number of bytes written to |dest|, or one |
| 4025 | * of the following negative error codes: |
| 4026 | * |
| 4027 | * NGTCP2_ERR_NOMEM |
| 4028 | * Out of memory |
| 4029 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4030 | * User-defined callback function failed. |
| 4031 | */ |
| 4032 | static ngtcp2_ssize conn_write_path_challenge(ngtcp2_conn *conn, |
| 4033 | ngtcp2_path *path, |
| 4034 | ngtcp2_pkt_info *pi, |
| 4035 | uint8_t *dest, size_t destlen, |
| 4036 | ngtcp2_tstamp ts) { |
| 4037 | int rv; |
| 4038 | ngtcp2_ssize nwrite; |
| 4039 | ngtcp2_tstamp expiry; |
| 4040 | ngtcp2_pv *pv = conn->pv; |
| 4041 | ngtcp2_frame lfr; |
| 4042 | ngtcp2_duration timeout; |
| 4043 | uint8_t flags; |
| 4044 | size_t tx_left; |
| 4045 | |
| 4046 | if (ngtcp2_pv_validation_timed_out(pv, ts)) { |
| 4047 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PTV, |
| 4048 | "path validation was timed out"); |
| 4049 | return conn_on_path_validation_failed(conn, pv, ts); |
| 4050 | } |
| 4051 | |
| 4052 | ngtcp2_pv_handle_entry_expiry(pv, ts); |
| 4053 | |
| 4054 | if (!ngtcp2_pv_should_send_probe(pv)) { |
| 4055 | return 0; |
| 4056 | } |
| 4057 | |
| 4058 | assert(conn->callbacks.rand)((void) (0)); |
| 4059 | rv = conn->callbacks.rand( |
| 4060 | lfr.path_challenge.data, sizeof(lfr.path_challenge.data), |
| 4061 | &conn->local.settings.rand_ctx, NGTCP2_RAND_USAGE_PATH_CHALLENGE); |
| 4062 | if (rv != 0) { |
| 4063 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 4064 | } |
| 4065 | |
| 4066 | lfr.type = NGTCP2_FRAME_PATH_CHALLENGE; |
| 4067 | |
| 4068 | timeout = conn_compute_pto(conn, &conn->pktns); |
| 4069 | timeout = ngtcp2_max(timeout, 3 * conn->cstat.initial_rtt)((timeout) > (3 * conn->cstat.initial_rtt) ? (timeout) : (3 * conn->cstat.initial_rtt)); |
| 4070 | expiry = ts + timeout * (1ULL << pv->round); |
| 4071 | |
| 4072 | if (conn->server) { |
| 4073 | if (!(pv->dcid.flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01)) { |
| 4074 | tx_left = conn_server_tx_left(conn, &pv->dcid); |
| 4075 | destlen = ngtcp2_min(destlen, tx_left)((destlen) < (tx_left) ? (destlen) : (tx_left)); |
| 4076 | if (destlen == 0) { |
| 4077 | return 0; |
| 4078 | } |
| 4079 | } |
| 4080 | |
| 4081 | if (destlen < 1200) { |
| 4082 | flags = NGTCP2_PV_ENTRY_FLAG_UNDERSIZED0x01; |
| 4083 | } else { |
| 4084 | flags = NGTCP2_PV_ENTRY_FLAG_NONE0x00; |
| 4085 | } |
| 4086 | } else { |
| 4087 | flags = NGTCP2_PV_ENTRY_FLAG_NONE0x00; |
| 4088 | } |
| 4089 | |
| 4090 | ngtcp2_pv_add_entry(pv, lfr.path_challenge.data, expiry, flags, ts); |
| 4091 | |
| 4092 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 4093 | conn, pi, dest, destlen, NGTCP2_PKT_SHORT, &pv->dcid.cid, &lfr, |
| 4094 | NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04, &pv->dcid.ps.path, ts); |
| 4095 | if (nwrite <= 0) { |
| 4096 | return nwrite; |
| 4097 | } |
| 4098 | |
| 4099 | if (path) { |
| 4100 | ngtcp2_path_copy(path, &pv->dcid.ps.path); |
| 4101 | } |
| 4102 | |
| 4103 | if (ngtcp2_path_eq(&pv->dcid.ps.path, &conn->dcid.current.ps.path)) { |
| 4104 | conn->dcid.current.bytes_sent += (uint64_t)nwrite; |
| 4105 | } else { |
| 4106 | pv->dcid.bytes_sent += (uint64_t)nwrite; |
| 4107 | } |
| 4108 | |
| 4109 | return nwrite; |
| 4110 | } |
| 4111 | |
| 4112 | /* |
| 4113 | * conn_write_path_response writes a packet which includes |
| 4114 | * PATH_RESPONSE frame into |dest| of length |destlen|. |
| 4115 | * |
| 4116 | * This function returns the number of bytes written to |dest|, or one |
| 4117 | * of the following negative error codes: |
| 4118 | * |
| 4119 | * NGTCP2_ERR_NOMEM |
| 4120 | * Out of memory |
| 4121 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4122 | * User-defined callback function failed. |
| 4123 | */ |
| 4124 | static ngtcp2_ssize conn_write_path_response(ngtcp2_conn *conn, |
| 4125 | ngtcp2_path *path, |
| 4126 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 4127 | size_t destlen, ngtcp2_tstamp ts) { |
| 4128 | ngtcp2_pv *pv = conn->pv; |
| 4129 | ngtcp2_path_challenge_entry *pcent = NULL((void*)0); |
| 4130 | ngtcp2_dcid *dcid = NULL((void*)0); |
| 4131 | ngtcp2_frame lfr; |
| 4132 | ngtcp2_ssize nwrite; |
| 4133 | int rv; |
| 4134 | size_t tx_left; |
| 4135 | |
| 4136 | for (; ngtcp2_ringbuf_len(&conn->rx.path_challenge)((&conn->rx.path_challenge)->len);) { |
| 4137 | pcent = ngtcp2_ringbuf_get(&conn->rx.path_challenge, 0); |
| 4138 | |
| 4139 | if (ngtcp2_path_eq(&conn->dcid.current.ps.path, &pcent->ps.path)) { |
| 4140 | /* Send PATH_RESPONSE from conn_write_pkt. */ |
| 4141 | return 0; |
| 4142 | } |
| 4143 | |
| 4144 | if (pv) { |
| 4145 | if (ngtcp2_path_eq(&pv->dcid.ps.path, &pcent->ps.path)) { |
| 4146 | dcid = &pv->dcid; |
| 4147 | break; |
| 4148 | } |
| 4149 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 4150 | ngtcp2_path_eq(&pv->fallback_dcid.ps.path, &pcent->ps.path)) { |
| 4151 | dcid = &pv->fallback_dcid; |
| 4152 | break; |
| 4153 | } |
| 4154 | } |
| 4155 | |
| 4156 | if (conn->server) { |
| 4157 | break; |
| 4158 | } |
| 4159 | |
| 4160 | /* Client does not expect to respond to path validation against |
| 4161 | unknown path */ |
| 4162 | ngtcp2_ringbuf_pop_front(&conn->rx.path_challenge); |
| 4163 | pcent = NULL((void*)0); |
| 4164 | } |
| 4165 | |
| 4166 | if (pcent == NULL((void*)0)) { |
| 4167 | return 0; |
| 4168 | } |
| 4169 | |
| 4170 | if (dcid == NULL((void*)0)) { |
| 4171 | /* client is expected to have |path| in conn->dcid.current or |
| 4172 | conn->pv. */ |
| 4173 | assert(conn->server)((void) (0)); |
| 4174 | |
| 4175 | rv = conn_bind_dcid(conn, &dcid, &pcent->ps.path, ts); |
| 4176 | if (rv != 0) { |
| 4177 | if (ngtcp2_err_is_fatal(rv)) { |
| 4178 | return rv; |
| 4179 | } |
| 4180 | return 0; |
| 4181 | } |
| 4182 | } |
| 4183 | |
| 4184 | if (conn->server && !(dcid->flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01)) { |
| 4185 | tx_left = conn_server_tx_left(conn, dcid); |
| 4186 | destlen = ngtcp2_min(destlen, tx_left)((destlen) < (tx_left) ? (destlen) : (tx_left)); |
| 4187 | if (destlen == 0) { |
| 4188 | return 0; |
| 4189 | } |
| 4190 | } |
| 4191 | |
| 4192 | lfr.type = NGTCP2_FRAME_PATH_RESPONSE; |
| 4193 | memcpy(lfr.path_response.data, pcent->data, sizeof(lfr.path_response.data)); |
| 4194 | |
| 4195 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 4196 | conn, pi, dest, destlen, NGTCP2_PKT_SHORT, &dcid->cid, &lfr, |
| 4197 | NGTCP2_RTB_ENTRY_FLAG_ACK_ELICITING0x04, &pcent->ps.path, ts); |
| 4198 | if (nwrite <= 0) { |
| 4199 | return nwrite; |
| 4200 | } |
| 4201 | |
| 4202 | if (path) { |
| 4203 | ngtcp2_path_copy(path, &pcent->ps.path); |
| 4204 | } |
| 4205 | |
| 4206 | ngtcp2_ringbuf_pop_front(&conn->rx.path_challenge); |
| 4207 | |
| 4208 | dcid->bytes_sent += (uint64_t)nwrite; |
| 4209 | |
| 4210 | return nwrite; |
| 4211 | } |
| 4212 | |
| 4213 | ngtcp2_ssize ngtcp2_conn_write_pkt(ngtcp2_conn *conn, ngtcp2_path *path, |
| 4214 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 4215 | size_t destlen, ngtcp2_tstamp ts) { |
| 4216 | return ngtcp2_conn_writev_stream(conn, path, pi, dest, destlen, |
| 4217 | /* pdatalen = */ NULL((void*)0), |
| 4218 | NGTCP2_WRITE_STREAM_FLAG_NONE0x00, |
| 4219 | /* stream_id = */ -1, |
| 4220 | /* datav = */ NULL((void*)0), /* datavcnt = */ 0, ts); |
| 4221 | } |
| 4222 | |
| 4223 | /* |
| 4224 | * conn_on_version_negotiation is called when Version Negotiation |
| 4225 | * packet is received. The function decodes the data in the buffer |
| 4226 | * pointed by |payload| whose length is |payloadlen| as Version |
| 4227 | * Negotiation packet payload. The packet header is given in |hd|. |
| 4228 | * |
| 4229 | * This function returns 0 if it succeeds, or one of the following |
| 4230 | * negative error codes: |
| 4231 | * |
| 4232 | * NGTCP2_ERR_NOMEM |
| 4233 | * Out of memory. |
| 4234 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4235 | * User-defined callback function failed. |
| 4236 | * NGTCP2_ERR_INVALID_ARGUMENT |
| 4237 | * Packet payload is badly formatted. |
| 4238 | */ |
| 4239 | static int conn_on_version_negotiation(ngtcp2_conn *conn, |
| 4240 | const ngtcp2_pkt_hd *hd, |
| 4241 | const uint8_t *payload, |
| 4242 | size_t payloadlen) { |
| 4243 | uint32_t sv[16]; |
| 4244 | uint32_t *p; |
| 4245 | int rv = 0; |
| 4246 | size_t nsv; |
| 4247 | size_t i; |
| 4248 | |
| 4249 | if (payloadlen % sizeof(uint32_t)) { |
| 4250 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 4251 | } |
| 4252 | |
| 4253 | if (payloadlen > sizeof(sv)) { |
| 4254 | p = ngtcp2_mem_malloc(conn->mem, payloadlen); |
| 4255 | if (p == NULL((void*)0)) { |
| 4256 | return NGTCP2_ERR_NOMEM-501; |
| 4257 | } |
| 4258 | } else { |
| 4259 | p = sv; |
| 4260 | } |
| 4261 | |
| 4262 | nsv = ngtcp2_pkt_decode_version_negotiation(p, payload, payloadlen); |
| 4263 | |
| 4264 | ngtcp2_log_rx_vn(&conn->log, hd, p, nsv); |
| 4265 | |
| 4266 | for (i = 0; i < nsv; ++i) { |
| 4267 | if (p[i] == conn->version) { |
| 4268 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 4269 | "ignore Version Negotiation because it contains version " |
| 4270 | "selected by client"); |
| 4271 | |
| 4272 | rv = NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 4273 | goto fin; |
| 4274 | } |
| 4275 | } |
| 4276 | |
| 4277 | if (conn->callbacks.recv_version_negotiation) { |
| 4278 | rv = conn->callbacks.recv_version_negotiation(conn, hd, p, nsv, |
| 4279 | conn->user_data); |
| 4280 | if (rv != 0) { |
| 4281 | rv = NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 4282 | } |
| 4283 | } |
| 4284 | |
| 4285 | if (rv == 0) { |
| 4286 | /* TODO Just move to the terminal state for now in order not to |
| 4287 | send CONNECTION_CLOSE frame. */ |
| 4288 | conn->state = NGTCP2_CS_DRAINING; |
| 4289 | } |
| 4290 | |
| 4291 | fin: |
| 4292 | if (p != sv) { |
| 4293 | ngtcp2_mem_free(conn->mem, p); |
| 4294 | } |
| 4295 | |
| 4296 | return rv; |
| 4297 | } |
| 4298 | |
| 4299 | static uint64_t conn_tx_strmq_first_cycle(ngtcp2_conn *conn) { |
| 4300 | ngtcp2_strm *strm; |
| 4301 | |
| 4302 | if (ngtcp2_pq_empty(&conn->tx.strmq)) { |
| 4303 | return 0; |
| 4304 | } |
| 4305 | |
| 4306 | strm = ngtcp2_struct_of(ngtcp2_pq_top(&conn->tx.strmq), ngtcp2_strm, pe)((ngtcp2_strm *)(void *)((char *)(ngtcp2_pq_top(&conn-> tx.strmq))-__builtin_offsetof(ngtcp2_strm, pe))); |
| 4307 | return strm->cycle; |
| 4308 | } |
| 4309 | |
| 4310 | uint64_t ngtcp2_conn_tx_strmq_first_cycle(ngtcp2_conn *conn) { |
| 4311 | ngtcp2_strm *strm; |
| 4312 | |
| 4313 | if (ngtcp2_pq_empty(&conn->tx.strmq)) { |
| 4314 | return 0; |
| 4315 | } |
| 4316 | |
| 4317 | strm = ngtcp2_struct_of(ngtcp2_pq_top(&conn->tx.strmq), ngtcp2_strm, pe)((ngtcp2_strm *)(void *)((char *)(ngtcp2_pq_top(&conn-> tx.strmq))-__builtin_offsetof(ngtcp2_strm, pe))); |
| 4318 | return strm->cycle; |
| 4319 | } |
| 4320 | |
| 4321 | int ngtcp2_conn_resched_frames(ngtcp2_conn *conn, ngtcp2_pktns *pktns, |
| 4322 | ngtcp2_frame_chain **pfrc) { |
| 4323 | ngtcp2_frame_chain **first = pfrc; |
| 4324 | ngtcp2_frame_chain *frc; |
| 4325 | ngtcp2_stream *sfr; |
| 4326 | ngtcp2_strm *strm; |
| 4327 | int rv; |
| 4328 | |
| 4329 | if (*pfrc == NULL((void*)0)) { |
| 4330 | return 0; |
| 4331 | } |
| 4332 | |
| 4333 | for (; *pfrc;) { |
| 4334 | switch ((*pfrc)->fr.type) { |
| 4335 | case NGTCP2_FRAME_STREAM: |
| 4336 | frc = *pfrc; |
| 4337 | |
| 4338 | *pfrc = frc->next; |
| 4339 | frc->next = NULL((void*)0); |
| 4340 | sfr = &frc->fr.stream; |
| 4341 | |
| 4342 | strm = ngtcp2_conn_find_stream(conn, sfr->stream_id); |
| 4343 | if (!strm) { |
| 4344 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 4345 | break; |
| 4346 | } |
| 4347 | rv = ngtcp2_strm_streamfrq_push(strm, frc); |
| 4348 | if (rv != 0) { |
| 4349 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 4350 | return rv; |
| 4351 | } |
| 4352 | if (!ngtcp2_strm_is_tx_queued(strm)) { |
| 4353 | strm->cycle = conn_tx_strmq_first_cycle(conn); |
| 4354 | rv = ngtcp2_conn_tx_strmq_push(conn, strm); |
| 4355 | if (rv != 0) { |
| 4356 | return rv; |
| 4357 | } |
| 4358 | } |
| 4359 | break; |
| 4360 | case NGTCP2_FRAME_CRYPTO: |
| 4361 | frc = *pfrc; |
| 4362 | |
| 4363 | *pfrc = frc->next; |
| 4364 | frc->next = NULL((void*)0); |
| 4365 | |
| 4366 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), |
| 4367 | &frc->fr.crypto.offset, frc); |
| 4368 | if (rv != 0) { |
| 4369 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 4370 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 4371 | return rv; |
| 4372 | } |
| 4373 | break; |
| 4374 | default: |
| 4375 | pfrc = &(*pfrc)->next; |
| 4376 | } |
| 4377 | } |
| 4378 | |
| 4379 | *pfrc = pktns->tx.frq; |
| 4380 | pktns->tx.frq = *first; |
| 4381 | |
| 4382 | return 0; |
| 4383 | } |
| 4384 | |
| 4385 | /* |
| 4386 | * conn_on_retry is called when Retry packet is received. The |
| 4387 | * function decodes the data in the buffer pointed by |pkt| whose |
| 4388 | * length is |pktlen| as Retry packet. The length of long packet |
| 4389 | * header is given in |hdpktlen|. |pkt| includes packet header. |
| 4390 | * |
| 4391 | * This function returns 0 if it succeeds, or one of the following |
| 4392 | * negative error codes: |
| 4393 | * |
| 4394 | * NGTCP2_ERR_NOMEM |
| 4395 | * Out of memory. |
| 4396 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4397 | * User-defined callback function failed. |
| 4398 | * NGTCP2_ERR_INVALID_ARGUMENT |
| 4399 | * Packet payload is badly formatted. |
| 4400 | * NGTCP2_ERR_PROTO |
| 4401 | * ODCID does not match; or Token is empty. |
| 4402 | */ |
| 4403 | static int conn_on_retry(ngtcp2_conn *conn, const ngtcp2_pkt_hd *hd, |
| 4404 | size_t hdpktlen, const uint8_t *pkt, size_t pktlen) { |
| 4405 | int rv; |
| 4406 | ngtcp2_pkt_retry retry; |
| 4407 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 4408 | ngtcp2_rtb *rtb = &conn->pktns.rtb; |
| 4409 | ngtcp2_rtb *in_rtb; |
| 4410 | uint8_t cidbuf[sizeof(retry.odcid.data) * 2 + 1]; |
| 4411 | ngtcp2_vec *token; |
| 4412 | |
| 4413 | if (!in_pktns || conn->flags & NGTCP2_CONN_FLAG_RECV_RETRY0x10) { |
| 4414 | return 0; |
| 4415 | } |
| 4416 | |
| 4417 | in_rtb = &in_pktns->rtb; |
| 4418 | |
| 4419 | rv = ngtcp2_pkt_decode_retry(&retry, pkt + hdpktlen, pktlen - hdpktlen); |
| 4420 | if (rv != 0) { |
| 4421 | return rv; |
| 4422 | } |
| 4423 | |
| 4424 | retry.odcid = conn->dcid.current.cid; |
| 4425 | |
| 4426 | rv = ngtcp2_pkt_verify_retry_tag( |
| 4427 | conn->version, &retry, pkt, pktlen, conn->callbacks.encrypt, |
| 4428 | &conn->crypto.retry_aead, &conn->crypto.retry_aead_ctx); |
| 4429 | if (rv != 0) { |
| 4430 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 4431 | "unable to verify Retry packet integrity"); |
| 4432 | return rv; |
| 4433 | } |
| 4434 | |
| 4435 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, "odcid=0x%s", |
| 4436 | (const char *)ngtcp2_encode_hex(cidbuf, retry.odcid.data, |
| 4437 | retry.odcid.datalen)); |
| 4438 | |
| 4439 | if (retry.token.len == 0) { |
| 4440 | return NGTCP2_ERR_PROTO-205; |
| 4441 | } |
| 4442 | |
| 4443 | if (ngtcp2_cid_eq(&conn->dcid.current.cid, &hd->scid)) { |
| 4444 | return 0; |
| 4445 | } |
| 4446 | |
| 4447 | ngtcp2_qlog_retry_pkt_received(&conn->qlog, hd); |
| 4448 | |
| 4449 | /* DCID must be updated before invoking callback because client |
| 4450 | generates new initial keys there. */ |
| 4451 | conn->dcid.current.cid = hd->scid; |
| 4452 | conn->retry_scid = hd->scid; |
| 4453 | |
| 4454 | conn->flags |= NGTCP2_CONN_FLAG_RECV_RETRY0x10; |
| 4455 | |
| 4456 | assert(conn->callbacks.recv_retry)((void) (0)); |
| 4457 | |
| 4458 | rv = conn->callbacks.recv_retry(conn, hd, conn->user_data); |
| 4459 | if (rv != 0) { |
| 4460 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 4461 | } |
| 4462 | |
| 4463 | conn->state = NGTCP2_CS_CLIENT_INITIAL; |
| 4464 | |
| 4465 | /* Just freeing memory is dangerous because we might free twice. */ |
| 4466 | |
| 4467 | rv = ngtcp2_rtb_remove_all(rtb, conn, &conn->pktns, &conn->cstat); |
| 4468 | if (rv != 0) { |
| 4469 | return rv; |
| 4470 | } |
| 4471 | |
| 4472 | rv = ngtcp2_rtb_remove_all(in_rtb, conn, in_pktns, &conn->cstat); |
| 4473 | if (rv != 0) { |
| 4474 | return rv; |
| 4475 | } |
| 4476 | |
| 4477 | token = &conn->local.settings.token; |
| 4478 | |
| 4479 | ngtcp2_mem_free(conn->mem, token->base); |
| 4480 | token->base = NULL((void*)0); |
| 4481 | token->len = 0; |
| 4482 | |
| 4483 | token->base = ngtcp2_mem_malloc(conn->mem, retry.token.len); |
| 4484 | if (token->base == NULL((void*)0)) { |
| 4485 | return NGTCP2_ERR_NOMEM-501; |
| 4486 | } |
| 4487 | token->len = retry.token.len; |
| 4488 | |
| 4489 | ngtcp2_cpymem(token->base, retry.token.base, retry.token.len); |
| 4490 | |
| 4491 | reset_conn_stat_recovery(&conn->cstat); |
| 4492 | conn_reset_congestion_state(conn); |
| 4493 | conn_reset_ecn_validation_state(conn); |
| 4494 | |
| 4495 | return 0; |
| 4496 | } |
| 4497 | |
| 4498 | int ngtcp2_conn_detect_lost_pkt(ngtcp2_conn *conn, ngtcp2_pktns *pktns, |
| 4499 | ngtcp2_conn_stat *cstat, ngtcp2_tstamp ts) { |
| 4500 | ngtcp2_duration pto = conn_compute_pto(conn, pktns); |
| 4501 | int rv = ngtcp2_rtb_detect_lost_pkt(&pktns->rtb, conn, pktns, cstat, pto, ts); |
| 4502 | if (rv != 0) { |
| 4503 | return rv; |
| 4504 | } |
| 4505 | |
| 4506 | return 0; |
| 4507 | } |
| 4508 | |
| 4509 | /* |
| 4510 | * conn_recv_ack processes received ACK frame |fr|. |pkt_ts| is the |
| 4511 | * timestamp when packet is received. |ts| should be the current |
| 4512 | * time. Usually they are the same, but for buffered packets, |
| 4513 | * |pkt_ts| would be earlier than |ts|. |
| 4514 | * |
| 4515 | * This function returns 0 if it succeeds, or one of the following |
| 4516 | * negative error codes: |
| 4517 | * |
| 4518 | * NGTCP2_ERR_NOMEM |
| 4519 | * Out of memory |
| 4520 | * NGTCP2_ERR_ACK_FRAME |
| 4521 | * ACK frame is malformed. |
| 4522 | * NGTCP2_ERR_PROTO |
| 4523 | * |fr| acknowledges a packet this endpoint has not sent. |
| 4524 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4525 | * User callback failed. |
| 4526 | */ |
| 4527 | static int conn_recv_ack(ngtcp2_conn *conn, ngtcp2_pktns *pktns, ngtcp2_ack *fr, |
| 4528 | ngtcp2_tstamp pkt_ts, ngtcp2_tstamp ts) { |
| 4529 | int rv; |
| 4530 | ngtcp2_frame_chain *frc = NULL((void*)0); |
| 4531 | ngtcp2_ssize num_acked; |
| 4532 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 4533 | |
| 4534 | if (pktns->tx.last_pkt_num < fr->largest_ack) { |
| 4535 | return NGTCP2_ERR_PROTO-205; |
| 4536 | } |
| 4537 | |
| 4538 | rv = ngtcp2_pkt_validate_ack(fr); |
| 4539 | if (rv != 0) { |
| 4540 | return rv; |
| 4541 | } |
| 4542 | |
| 4543 | ngtcp2_acktr_recv_ack(&pktns->acktr, fr); |
| 4544 | |
| 4545 | num_acked = ngtcp2_rtb_recv_ack(&pktns->rtb, fr, &conn->cstat, conn, pktns, |
| 4546 | pkt_ts, ts); |
| 4547 | if (num_acked < 0) { |
| 4548 | /* TODO assert this */ |
| 4549 | assert(ngtcp2_err_is_fatal((int)num_acked))((void) (0)); |
| 4550 | ngtcp2_frame_chain_list_del(frc, conn->mem); |
| 4551 | return (int)num_acked; |
| 4552 | } |
| 4553 | |
| 4554 | if (num_acked == 0) { |
| 4555 | return 0; |
| 4556 | } |
| 4557 | |
| 4558 | rv = ngtcp2_conn_detect_lost_pkt(conn, pktns, &conn->cstat, ts); |
| 4559 | if (rv != 0) { |
| 4560 | return rv; |
| 4561 | } |
| 4562 | |
| 4563 | pktns->rtb.probe_pkt_left = 0; |
| 4564 | |
| 4565 | if (cstat->pto_count && |
| 4566 | (conn->server || (conn->flags & NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000))) { |
| 4567 | /* Reset PTO count but no less than 2 to avoid frequent probe |
| 4568 | packet transmission. */ |
| 4569 | cstat->pto_count = ngtcp2_min(cstat->pto_count, 2)((cstat->pto_count) < (2) ? (cstat->pto_count) : (2) ); |
| 4570 | } |
| 4571 | |
| 4572 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 4573 | |
| 4574 | return 0; |
| 4575 | } |
| 4576 | |
| 4577 | /* |
| 4578 | * conn_assign_recved_ack_delay_unscaled assigns |
| 4579 | * fr->ack_delay_unscaled. |
| 4580 | */ |
| 4581 | static void assign_recved_ack_delay_unscaled(ngtcp2_ack *fr, |
| 4582 | uint64_t ack_delay_exponent) { |
| 4583 | fr->ack_delay_unscaled = |
| 4584 | fr->ack_delay * (1ULL << ack_delay_exponent) * NGTCP2_MICROSECONDS((uint64_t)1000ULL); |
| 4585 | } |
| 4586 | |
| 4587 | /* |
| 4588 | * conn_recv_max_stream_data processes received MAX_STREAM_DATA frame |
| 4589 | * |fr|. |
| 4590 | * |
| 4591 | * This function returns 0 if it succeeds, or one of the following |
| 4592 | * negative error codes: |
| 4593 | * |
| 4594 | * NGTCP2_ERR_STREAM_STATE |
| 4595 | * Stream ID indicates that it is a local stream, and the local |
| 4596 | * endpoint has not initiated it; or stream is peer initiated |
| 4597 | * unidirectional stream. |
| 4598 | * NGTCP2_ERR_STREAM_LIMIT |
| 4599 | * Stream ID exceeds allowed limit. |
| 4600 | * NGTCP2_ERR_NOMEM |
| 4601 | * Out of memory. |
| 4602 | */ |
| 4603 | static int conn_recv_max_stream_data(ngtcp2_conn *conn, |
| 4604 | const ngtcp2_max_stream_data *fr) { |
| 4605 | ngtcp2_strm *strm; |
| 4606 | ngtcp2_idtr *idtr; |
| 4607 | int local_stream = conn_local_stream(conn, fr->stream_id); |
| 4608 | int bidi = bidi_stream(fr->stream_id); |
| 4609 | int rv; |
| 4610 | |
| 4611 | if (bidi) { |
| 4612 | if (local_stream) { |
| 4613 | if (conn->local.bidi.next_stream_id <= fr->stream_id) { |
| 4614 | return NGTCP2_ERR_STREAM_STATE-226; |
| 4615 | } |
| 4616 | } else if (conn->remote.bidi.max_streams < |
| 4617 | ngtcp2_ord_stream_id(fr->stream_id)) { |
| 4618 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 4619 | } |
| 4620 | |
| 4621 | idtr = &conn->remote.bidi.idtr; |
| 4622 | } else { |
| 4623 | if (!local_stream || conn->local.uni.next_stream_id <= fr->stream_id) { |
| 4624 | return NGTCP2_ERR_STREAM_STATE-226; |
| 4625 | } |
| 4626 | |
| 4627 | idtr = &conn->remote.uni.idtr; |
| 4628 | } |
| 4629 | |
| 4630 | strm = ngtcp2_conn_find_stream(conn, fr->stream_id); |
| 4631 | if (strm == NULL((void*)0)) { |
| 4632 | if (local_stream) { |
| 4633 | /* Stream has been closed. */ |
| 4634 | return 0; |
| 4635 | } |
| 4636 | |
| 4637 | rv = ngtcp2_idtr_open(idtr, fr->stream_id); |
| 4638 | if (rv != 0) { |
| 4639 | if (ngtcp2_err_is_fatal(rv)) { |
| 4640 | return rv; |
| 4641 | } |
| 4642 | assert(rv == NGTCP2_ERR_STREAM_IN_USE)((void) (0)); |
| 4643 | /* Stream has been closed. */ |
| 4644 | return 0; |
| 4645 | } |
| 4646 | |
| 4647 | strm = ngtcp2_mem_malloc(conn->mem, sizeof(ngtcp2_strm)); |
| 4648 | if (strm == NULL((void*)0)) { |
| 4649 | return NGTCP2_ERR_NOMEM-501; |
| 4650 | } |
| 4651 | rv = ngtcp2_conn_init_stream(conn, strm, fr->stream_id, NULL((void*)0)); |
| 4652 | if (rv != 0) { |
| 4653 | ngtcp2_mem_free(conn->mem, strm); |
| 4654 | return rv; |
| 4655 | } |
| 4656 | } |
| 4657 | |
| 4658 | if (strm->tx.max_offset < fr->max_stream_data) { |
| 4659 | strm->tx.max_offset = fr->max_stream_data; |
| 4660 | |
| 4661 | /* Don't call callback if stream is half-closed local */ |
| 4662 | if (strm->flags & NGTCP2_STRM_FLAG_SHUT_WR0x02) { |
| 4663 | return 0; |
| 4664 | } |
| 4665 | |
| 4666 | rv = conn_call_extend_max_stream_data(conn, strm, fr->stream_id, |
| 4667 | fr->max_stream_data); |
| 4668 | if (rv != 0) { |
| 4669 | return rv; |
| 4670 | } |
| 4671 | } |
| 4672 | |
| 4673 | return 0; |
| 4674 | } |
| 4675 | |
| 4676 | /* |
| 4677 | * conn_recv_max_data processes received MAX_DATA frame |fr|. |
| 4678 | */ |
| 4679 | static void conn_recv_max_data(ngtcp2_conn *conn, const ngtcp2_max_data *fr) { |
| 4680 | conn->tx.max_offset = ngtcp2_max(conn->tx.max_offset, fr->max_data)((conn->tx.max_offset) > (fr->max_data) ? (conn-> tx.max_offset) : (fr->max_data)); |
| 4681 | } |
| 4682 | |
| 4683 | /* |
| 4684 | * conn_buffer_pkt buffers |pkt| of length |pktlen|, chaining it from |
| 4685 | * |*ppc|. |
| 4686 | * |
| 4687 | * This function returns 0 if it succeeds, or one of the following |
| 4688 | * negative error codes: |
| 4689 | * |
| 4690 | * NGTCP2_ERR_NOMEM |
| 4691 | * Out of memory. |
| 4692 | */ |
| 4693 | static int conn_buffer_pkt(ngtcp2_conn *conn, ngtcp2_pktns *pktns, |
| 4694 | const ngtcp2_path *path, const ngtcp2_pkt_info *pi, |
| 4695 | const uint8_t *pkt, size_t pktlen, size_t dgramlen, |
| 4696 | ngtcp2_tstamp ts) { |
| 4697 | int rv; |
| 4698 | ngtcp2_pkt_chain **ppc = &pktns->rx.buffed_pkts, *pc; |
| 4699 | size_t i; |
| 4700 | for (i = 0; *ppc && i < NGTCP2_MAX_NUM_BUFFED_RX_PKTS4; |
| 4701 | ppc = &(*ppc)->next, ++i) |
| 4702 | ; |
| 4703 | |
| 4704 | if (i == NGTCP2_MAX_NUM_BUFFED_RX_PKTS4) { |
| 4705 | return 0; |
| 4706 | } |
| 4707 | |
| 4708 | rv = |
| 4709 | ngtcp2_pkt_chain_new(&pc, path, pi, pkt, pktlen, dgramlen, ts, conn->mem); |
| 4710 | if (rv != 0) { |
| 4711 | return rv; |
| 4712 | } |
| 4713 | |
| 4714 | *ppc = pc; |
| 4715 | |
| 4716 | return 0; |
| 4717 | } |
| 4718 | |
| 4719 | static int ensure_decrypt_buffer(ngtcp2_vec *vec, size_t n, size_t initial, |
| 4720 | const ngtcp2_mem *mem) { |
| 4721 | uint8_t *nbuf; |
| 4722 | size_t len; |
| 4723 | |
| 4724 | if (vec->len >= n) { |
| 4725 | return 0; |
| 4726 | } |
| 4727 | |
| 4728 | len = vec->len == 0 ? initial : vec->len * 2; |
| 4729 | for (; len < n; len *= 2) |
| 4730 | ; |
| 4731 | nbuf = ngtcp2_mem_realloc(mem, vec->base, len); |
| 4732 | if (nbuf == NULL((void*)0)) { |
| 4733 | return NGTCP2_ERR_NOMEM-501; |
| 4734 | } |
| 4735 | vec->base = nbuf; |
| 4736 | vec->len = len; |
| 4737 | |
| 4738 | return 0; |
| 4739 | } |
| 4740 | |
| 4741 | /* |
| 4742 | * conn_ensure_decrypt_hp_buffer ensures that |
| 4743 | * conn->crypto.decrypt_hp_buf has at least |n| bytes space. |
| 4744 | * |
| 4745 | * This function returns 0 if it succeeds, or one of the following |
| 4746 | * negative error codes: |
| 4747 | * |
| 4748 | * NGTCP2_ERR_NOMEM |
| 4749 | * Out of memory. |
| 4750 | */ |
| 4751 | static int conn_ensure_decrypt_hp_buffer(ngtcp2_conn *conn, size_t n) { |
| 4752 | return ensure_decrypt_buffer(&conn->crypto.decrypt_hp_buf, n, 256, conn->mem); |
| 4753 | } |
| 4754 | |
| 4755 | /* |
| 4756 | * conn_ensure_decrypt_buffer ensures that conn->crypto.decrypt_buf |
| 4757 | * has at least |n| bytes space. |
| 4758 | * |
| 4759 | * This function returns 0 if it succeeds, or one of the following |
| 4760 | * negative error codes: |
| 4761 | * |
| 4762 | * NGTCP2_ERR_NOMEM |
| 4763 | * Out of memory. |
| 4764 | */ |
| 4765 | static int conn_ensure_decrypt_buffer(ngtcp2_conn *conn, size_t n) { |
| 4766 | return ensure_decrypt_buffer(&conn->crypto.decrypt_buf, n, 2048, conn->mem); |
| 4767 | } |
| 4768 | |
| 4769 | /* |
| 4770 | * decrypt_pkt decrypts the data pointed by |payload| whose length is |
| 4771 | * |payloadlen|, and writes plaintext data to the buffer pointed by |
| 4772 | * |dest|. The buffer pointed by |ad| is the Additional Data, and its |
| 4773 | * length is |adlen|. |pkt_num| is used to create a nonce. |ckm| is |
| 4774 | * the cryptographic key, and iv to use. |decrypt| is a callback |
| 4775 | * function which actually decrypts a packet. |
| 4776 | * |
| 4777 | * This function returns the number of bytes written in |dest| if it |
| 4778 | * succeeds, or one of the following negative error codes: |
| 4779 | * |
| 4780 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4781 | * User callback failed. |
| 4782 | * NGTCP2_ERR_TLS_DECRYPT |
| 4783 | * TLS backend failed to decrypt data. |
| 4784 | */ |
| 4785 | static ngtcp2_ssize decrypt_pkt(uint8_t *dest, const ngtcp2_crypto_aead *aead, |
| 4786 | const uint8_t *payload, size_t payloadlen, |
| 4787 | const uint8_t *ad, size_t adlen, |
| 4788 | int64_t pkt_num, ngtcp2_crypto_km *ckm, |
| 4789 | ngtcp2_decrypt decrypt) { |
| 4790 | /* TODO nonce is limited to 64 bytes. */ |
| 4791 | uint8_t nonce[64]; |
| 4792 | int rv; |
| 4793 | |
| 4794 | assert(sizeof(nonce) >= ckm->iv.len)((void) (0)); |
| 4795 | |
| 4796 | ngtcp2_crypto_create_nonce(nonce, ckm->iv.base, ckm->iv.len, pkt_num); |
| 4797 | |
| 4798 | rv = decrypt(dest, aead, &ckm->aead_ctx, payload, payloadlen, nonce, |
| 4799 | ckm->iv.len, ad, adlen); |
| 4800 | |
| 4801 | if (rv != 0) { |
| 4802 | if (rv == NGTCP2_ERR_TLS_DECRYPT-220) { |
| 4803 | return rv; |
| 4804 | } |
| 4805 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 4806 | } |
| 4807 | |
| 4808 | assert(payloadlen >= aead->max_overhead)((void) (0)); |
| 4809 | |
| 4810 | return (ngtcp2_ssize)(payloadlen - aead->max_overhead); |
| 4811 | } |
| 4812 | |
| 4813 | /* |
| 4814 | * decrypt_hp decryptes packet header. The packet number starts at |
| 4815 | * |pkt| + |pkt_num_offset|. The entire plaintext QUIC packet header |
| 4816 | * will be written to the buffer pointed by |dest| whose capacity is |
| 4817 | * |destlen|. |
| 4818 | * |
| 4819 | * This function returns the number of bytes written to |dest|, or one |
| 4820 | * of the following negative error codes: |
| 4821 | * |
| 4822 | * NGTCP2_ERR_PROTO |
| 4823 | * Packet is badly formatted |
| 4824 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4825 | * User-defined callback function failed; or it does not return |
| 4826 | * expected result. |
| 4827 | */ |
| 4828 | static ngtcp2_ssize decrypt_hp(ngtcp2_pkt_hd *hd, uint8_t *dest, |
| 4829 | const ngtcp2_crypto_cipher *hp, |
| 4830 | const uint8_t *pkt, size_t pktlen, |
| 4831 | size_t pkt_num_offset, ngtcp2_crypto_km *ckm, |
| 4832 | const ngtcp2_crypto_cipher_ctx *hp_ctx, |
| 4833 | ngtcp2_hp_mask hp_mask) { |
| 4834 | size_t sample_offset; |
| 4835 | uint8_t *p = dest; |
| 4836 | uint8_t mask[NGTCP2_HP_MASKLEN5]; |
| 4837 | size_t i; |
| 4838 | int rv; |
| 4839 | |
| 4840 | assert(hp_mask)((void) (0)); |
| 4841 | assert(ckm)((void) (0)); |
| 4842 | |
| 4843 | if (pkt_num_offset + 4 + NGTCP2_HP_SAMPLELEN16 > pktlen) { |
| 4844 | return NGTCP2_ERR_PROTO-205; |
| 4845 | } |
| 4846 | |
| 4847 | p = ngtcp2_cpymem(p, pkt, pkt_num_offset); |
| 4848 | |
| 4849 | sample_offset = pkt_num_offset + 4; |
| 4850 | |
| 4851 | rv = hp_mask(mask, hp, hp_ctx, pkt + sample_offset); |
| 4852 | if (rv != 0) { |
| 4853 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 4854 | } |
| 4855 | |
| 4856 | if (hd->flags & NGTCP2_PKT_FLAG_LONG_FORM0x01) { |
| 4857 | dest[0] = (uint8_t)(dest[0] ^ (mask[0] & 0x0f)); |
| 4858 | } else { |
| 4859 | dest[0] = (uint8_t)(dest[0] ^ (mask[0] & 0x1f)); |
| 4860 | if (dest[0] & NGTCP2_SHORT_KEY_PHASE_BIT0x04) { |
| 4861 | hd->flags |= NGTCP2_PKT_FLAG_KEY_PHASE0x04; |
| 4862 | } |
| 4863 | } |
| 4864 | |
| 4865 | hd->pkt_numlen = (size_t)((dest[0] & NGTCP2_PKT_NUMLEN_MASK0x03) + 1); |
| 4866 | |
| 4867 | for (i = 0; i < hd->pkt_numlen; ++i) { |
| 4868 | *p++ = *(pkt + pkt_num_offset + i) ^ mask[i + 1]; |
| 4869 | } |
| 4870 | |
| 4871 | hd->pkt_num = ngtcp2_get_pkt_num(p - hd->pkt_numlen, hd->pkt_numlen); |
| 4872 | |
| 4873 | return p - dest; |
| 4874 | } |
| 4875 | |
| 4876 | /* |
| 4877 | * conn_emit_pending_crypto_data delivers pending stream data to the |
| 4878 | * application due to packet reordering. |
| 4879 | * |
| 4880 | * This function returns 0 if it succeeds, or one of the following |
| 4881 | * negative error codes: |
| 4882 | * |
| 4883 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 4884 | * User callback failed |
| 4885 | * NGTCP2_ERR_CRYPTO |
| 4886 | * TLS backend reported error |
| 4887 | */ |
| 4888 | static int conn_emit_pending_crypto_data(ngtcp2_conn *conn, |
| 4889 | ngtcp2_crypto_level crypto_level, |
| 4890 | ngtcp2_strm *strm, |
| 4891 | uint64_t rx_offset) { |
| 4892 | size_t datalen; |
| 4893 | const uint8_t *data; |
| 4894 | int rv; |
| 4895 | uint64_t offset; |
| 4896 | |
| 4897 | if (!strm->rx.rob) { |
| 4898 | return 0; |
| 4899 | } |
| 4900 | |
| 4901 | for (;;) { |
| 4902 | datalen = ngtcp2_rob_data_at(strm->rx.rob, &data, rx_offset); |
| 4903 | if (datalen == 0) { |
| 4904 | assert(rx_offset == ngtcp2_strm_rx_offset(strm))((void) (0)); |
| 4905 | return 0; |
| 4906 | } |
| 4907 | |
| 4908 | offset = rx_offset; |
| 4909 | rx_offset += datalen; |
| 4910 | |
| 4911 | rv = conn_call_recv_crypto_data(conn, crypto_level, offset, data, datalen); |
| 4912 | if (rv != 0) { |
| 4913 | return rv; |
| 4914 | } |
| 4915 | |
| 4916 | ngtcp2_rob_pop(strm->rx.rob, rx_offset - datalen, datalen); |
| 4917 | } |
| 4918 | } |
| 4919 | |
| 4920 | /* |
| 4921 | * conn_recv_connection_close is called when CONNECTION_CLOSE or |
| 4922 | * APPLICATION_CLOSE frame is received. |
| 4923 | */ |
| 4924 | static void conn_recv_connection_close(ngtcp2_conn *conn, |
| 4925 | ngtcp2_connection_close *fr) { |
| 4926 | conn->state = NGTCP2_CS_DRAINING; |
| 4927 | if (fr->type == NGTCP2_FRAME_CONNECTION_CLOSE) { |
| 4928 | conn->rx.ccec.type = NGTCP2_CONNECTION_CLOSE_ERROR_CODE_TYPE_TRANSPORT; |
| 4929 | } else { |
| 4930 | conn->rx.ccec.type = NGTCP2_CONNECTION_CLOSE_ERROR_CODE_TYPE_APPLICATION; |
| 4931 | } |
| 4932 | conn->rx.ccec.error_code = fr->error_code; |
| 4933 | } |
| 4934 | |
| 4935 | static void conn_recv_path_challenge(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 4936 | ngtcp2_path_challenge *fr) { |
| 4937 | ngtcp2_path_challenge_entry *ent; |
| 4938 | |
| 4939 | /* client only responds to PATH_CHALLENGE from the current path. */ |
| 4940 | if (!conn->server && !ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 4941 | ngtcp2_log_info( |
| 4942 | &conn->log, NGTCP2_LOG_EVENT_CON, |
| 4943 | "discard PATH_CHALLENGE from the path which is not current"); |
| 4944 | return; |
| 4945 | } |
| 4946 | |
| 4947 | ent = ngtcp2_ringbuf_push_front(&conn->rx.path_challenge); |
| 4948 | ngtcp2_path_challenge_entry_init(ent, path, fr->data); |
| 4949 | } |
| 4950 | |
| 4951 | /* |
| 4952 | * conn_reset_congestion_state resets congestion state. |
| 4953 | */ |
| 4954 | static void conn_reset_congestion_state(ngtcp2_conn *conn) { |
| 4955 | conn_reset_conn_stat_cc(conn, &conn->cstat); |
| 4956 | |
| 4957 | conn->cc.reset(&conn->cc); |
| 4958 | |
| 4959 | if (conn->hs_pktns) { |
| 4960 | ngtcp2_rtb_reset_cc_state(&conn->hs_pktns->rtb, |
| 4961 | conn->hs_pktns->tx.last_pkt_num + 1); |
| 4962 | } |
| 4963 | ngtcp2_rtb_reset_cc_state(&conn->pktns.rtb, conn->pktns.tx.last_pkt_num + 1); |
| 4964 | ngtcp2_rst_init(&conn->rst); |
| 4965 | } |
| 4966 | |
| 4967 | static int conn_recv_path_response(ngtcp2_conn *conn, ngtcp2_path_response *fr, |
| 4968 | ngtcp2_tstamp ts) { |
| 4969 | int rv; |
| 4970 | ngtcp2_duration pto, timeout; |
| 4971 | ngtcp2_pv *pv = conn->pv, *npv; |
| 4972 | uint8_t ent_flags; |
| 4973 | |
| 4974 | if (!pv) { |
| 4975 | return 0; |
| 4976 | } |
| 4977 | |
| 4978 | rv = ngtcp2_pv_validate(pv, &ent_flags, fr->data); |
| 4979 | if (rv != 0) { |
| 4980 | if (rv == NGTCP2_ERR_PATH_VALIDATION_FAILED-236) { |
| 4981 | return conn_on_path_validation_failed(conn, pv, ts); |
| 4982 | } |
| 4983 | return 0; |
| 4984 | } |
| 4985 | |
| 4986 | if (!(pv->flags & NGTCP2_PV_FLAG_DONT_CARE0x01)) { |
| 4987 | if (!(pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04)) { |
| 4988 | if (pv->dcid.seq != conn->dcid.current.seq) { |
| 4989 | assert(conn->dcid.current.cid.datalen)((void) (0)); |
| 4990 | |
| 4991 | rv = conn_retire_dcid(conn, &conn->dcid.current, ts); |
| 4992 | if (rv != 0) { |
| 4993 | goto fail; |
| 4994 | } |
| 4995 | ngtcp2_dcid_copy(&conn->dcid.current, &pv->dcid); |
| 4996 | } |
| 4997 | conn_reset_congestion_state(conn); |
| 4998 | conn_reset_ecn_validation_state(conn); |
| 4999 | } |
| 5000 | |
| 5001 | if (ngtcp2_path_eq(&pv->dcid.ps.path, &conn->dcid.current.ps.path)) { |
| 5002 | conn->dcid.current.flags |= NGTCP2_DCID_FLAG_PATH_VALIDATED0x01; |
| 5003 | } |
| 5004 | |
| 5005 | rv = conn_call_path_validation(conn, &pv->dcid.ps.path, |
| 5006 | NGTCP2_PATH_VALIDATION_RESULT_SUCCESS); |
| 5007 | if (rv != 0) { |
| 5008 | goto fail; |
| 5009 | } |
| 5010 | } |
| 5011 | |
| 5012 | if (pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) { |
| 5013 | pto = conn_compute_pto(conn, &conn->pktns); |
| 5014 | timeout = 3 * ngtcp2_max(pto, pv->fallback_pto)((pto) > (pv->fallback_pto) ? (pto) : (pv->fallback_pto )); |
| 5015 | |
| 5016 | if (ent_flags & NGTCP2_PV_ENTRY_FLAG_UNDERSIZED0x01) { |
| 5017 | assert(conn->server)((void) (0)); |
| 5018 | |
| 5019 | /* Validate path again */ |
| 5020 | rv = ngtcp2_pv_new(&npv, &pv->dcid, timeout, |
| 5021 | NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04 | |
| 5022 | NGTCP2_PV_FLAG_MTU_PROBE0x08, |
| 5023 | &conn->log, conn->mem); |
| 5024 | if (rv != 0) { |
| 5025 | goto fail; |
| 5026 | } |
| 5027 | |
| 5028 | npv->dcid.flags |= NGTCP2_DCID_FLAG_PATH_VALIDATED0x01; |
| 5029 | ngtcp2_dcid_copy(&npv->fallback_dcid, &pv->fallback_dcid); |
| 5030 | npv->fallback_pto = pv->fallback_pto; |
| 5031 | } else { |
| 5032 | rv = ngtcp2_pv_new(&npv, &pv->fallback_dcid, timeout, |
| 5033 | NGTCP2_PV_FLAG_DONT_CARE0x01, &conn->log, conn->mem); |
| 5034 | if (rv != 0) { |
| 5035 | goto fail; |
| 5036 | } |
| 5037 | } |
| 5038 | |
| 5039 | /* Unset the flag bit so that conn_stop_pv does not retire |
| 5040 | DCID. */ |
| 5041 | pv->flags &= (uint8_t)~NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04; |
| 5042 | |
| 5043 | rv = conn_stop_pv(conn, ts); |
| 5044 | if (rv != 0) { |
| 5045 | ngtcp2_pv_del(npv); |
| 5046 | return rv; |
| 5047 | } |
| 5048 | |
| 5049 | conn->pv = npv; |
| 5050 | |
| 5051 | return 0; |
| 5052 | } |
| 5053 | |
| 5054 | fail: |
| 5055 | return conn_stop_pv(conn, ts); |
| 5056 | } |
| 5057 | |
| 5058 | /* |
| 5059 | * pkt_num_bits returns the number of bits available when packet |
| 5060 | * number is encoded in |pkt_numlen| bytes. |
| 5061 | */ |
| 5062 | static size_t pkt_num_bits(size_t pkt_numlen) { |
| 5063 | switch (pkt_numlen) { |
| 5064 | case 1: |
| 5065 | return 8; |
| 5066 | case 2: |
| 5067 | return 16; |
| 5068 | case 3: |
| 5069 | return 24; |
| 5070 | case 4: |
| 5071 | return 32; |
| 5072 | default: |
| 5073 | assert(0)((void) (0)); |
| 5074 | abort(); |
| 5075 | } |
| 5076 | } |
| 5077 | |
| 5078 | /* |
| 5079 | * pktns_pkt_num_is_duplicate returns nonzero if |pkt_num| is |
| 5080 | * duplicated packet number. |
| 5081 | */ |
| 5082 | static int pktns_pkt_num_is_duplicate(ngtcp2_pktns *pktns, int64_t pkt_num) { |
| 5083 | return ngtcp2_gaptr_is_pushed(&pktns->rx.pngap, (uint64_t)pkt_num, 1); |
| 5084 | } |
| 5085 | |
| 5086 | /* |
| 5087 | * pktns_commit_recv_pkt_num marks packet number |pkt_num| as |
| 5088 | * received. |
| 5089 | */ |
| 5090 | static int pktns_commit_recv_pkt_num(ngtcp2_pktns *pktns, int64_t pkt_num, |
| 5091 | int ack_eliciting, ngtcp2_tstamp ts) { |
| 5092 | int rv; |
| 5093 | |
| 5094 | if (ack_eliciting && pktns->rx.max_ack_eliciting_pkt_num + 1 != pkt_num) { |
| 5095 | ngtcp2_acktr_immediate_ack(&pktns->acktr); |
| 5096 | } |
| 5097 | if (pktns->rx.max_pkt_num < pkt_num) { |
| 5098 | pktns->rx.max_pkt_num = pkt_num; |
| 5099 | pktns->rx.max_pkt_ts = ts; |
| 5100 | } |
| 5101 | if (ack_eliciting && pktns->rx.max_ack_eliciting_pkt_num < pkt_num) { |
| 5102 | pktns->rx.max_ack_eliciting_pkt_num = pkt_num; |
| 5103 | } |
| 5104 | |
| 5105 | rv = ngtcp2_gaptr_push(&pktns->rx.pngap, (uint64_t)pkt_num, 1); |
| 5106 | if (rv != 0) { |
| 5107 | return rv; |
| 5108 | } |
| 5109 | |
| 5110 | if (ngtcp2_ksl_len(&pktns->rx.pngap.gap) > 256) { |
| 5111 | ngtcp2_gaptr_drop_first_gap(&pktns->rx.pngap); |
| 5112 | } |
| 5113 | |
| 5114 | return 0; |
| 5115 | } |
| 5116 | |
| 5117 | /* |
| 5118 | * verify_token verifies |hd| contains |token| in its token field. It |
| 5119 | * returns 0 if it succeeds, or NGTCP2_ERR_PROTO. |
| 5120 | */ |
| 5121 | static int verify_token(const ngtcp2_vec *token, const ngtcp2_pkt_hd *hd) { |
| 5122 | if (token->len == hd->token.len && |
| 5123 | ngtcp2_cmemeq(token->base, hd->token.base, token->len)) { |
| 5124 | return 0; |
| 5125 | } |
| 5126 | return NGTCP2_ERR_PROTO-205; |
| 5127 | } |
| 5128 | |
| 5129 | static void pktns_increase_ecn_counts(ngtcp2_pktns *pktns, |
| 5130 | const ngtcp2_pkt_info *pi) { |
| 5131 | switch (pi->ecn & NGTCP2_ECN_MASK0x3) { |
| 5132 | case NGTCP2_ECN_ECT_00x2: |
| 5133 | ++pktns->rx.ecn.ect0; |
| 5134 | break; |
| 5135 | case NGTCP2_ECN_ECT_10x1: |
| 5136 | ++pktns->rx.ecn.ect1; |
| 5137 | break; |
| 5138 | case NGTCP2_ECN_CE0x3: |
| 5139 | ++pktns->rx.ecn.ce; |
| 5140 | break; |
| 5141 | } |
| 5142 | } |
| 5143 | |
| 5144 | static int conn_recv_crypto(ngtcp2_conn *conn, ngtcp2_crypto_level crypto_level, |
| 5145 | ngtcp2_strm *strm, const ngtcp2_crypto *fr); |
| 5146 | |
| 5147 | static ngtcp2_ssize conn_recv_pkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 5148 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 5149 | size_t pktlen, size_t dgramlen, |
| 5150 | ngtcp2_tstamp pkt_ts, ngtcp2_tstamp ts); |
| 5151 | |
| 5152 | static int conn_process_buffered_protected_pkt(ngtcp2_conn *conn, |
| 5153 | ngtcp2_pktns *pktns, |
| 5154 | ngtcp2_tstamp ts); |
| 5155 | |
| 5156 | /* |
| 5157 | * conn_recv_handshake_pkt processes received packet |pkt| whose |
| 5158 | * length is |pktlen| during handshake period. The buffer pointed by |
| 5159 | * |pkt| might contain multiple packets. This function only processes |
| 5160 | * one packet. |pkt_ts| is the timestamp when packet is received. |
| 5161 | * |ts| should be the current time. Usually they are the same, but |
| 5162 | * for buffered packets, |pkt_ts| would be earlier than |ts|. |
| 5163 | * |
| 5164 | * This function returns the number of bytes it reads if it succeeds, |
| 5165 | * or one of the following negative error codes: |
| 5166 | * |
| 5167 | * NGTCP2_ERR_RECV_VERSION_NEGOTIATION |
| 5168 | * Version Negotiation packet is received. |
| 5169 | * NGTCP2_ERR_NOMEM |
| 5170 | * Out of memory. |
| 5171 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 5172 | * User-defined callback function failed. |
| 5173 | * NGTCP2_ERR_DISCARD_PKT |
| 5174 | * Packet was discarded because plain text header was malformed; |
| 5175 | * or its payload could not be decrypted. |
| 5176 | * NGTCP2_ERR_FRAME_FORMAT |
| 5177 | * Frame is badly formatted |
| 5178 | * NGTCP2_ERR_ACK_FRAME |
| 5179 | * ACK frame is malformed. |
| 5180 | * NGTCP2_ERR_CRYPTO |
| 5181 | * TLS stack reported error. |
| 5182 | * NGTCP2_ERR_PROTO |
| 5183 | * Generic QUIC protocol error. |
| 5184 | * |
| 5185 | * In addition to the above error codes, error codes returned from |
| 5186 | * conn_recv_pkt are also returned. |
| 5187 | */ |
| 5188 | static ngtcp2_ssize |
| 5189 | conn_recv_handshake_pkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 5190 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 5191 | size_t pktlen, size_t dgramlen, ngtcp2_tstamp pkt_ts, |
| 5192 | ngtcp2_tstamp ts) { |
| 5193 | ngtcp2_ssize nread; |
| 5194 | ngtcp2_pkt_hd hd; |
| 5195 | ngtcp2_max_frame mfr; |
| 5196 | ngtcp2_frame *fr = &mfr.fr; |
| 5197 | int rv; |
| 5198 | int require_ack = 0; |
| 5199 | size_t hdpktlen; |
| 5200 | const uint8_t *payload; |
| 5201 | size_t payloadlen; |
| 5202 | ngtcp2_ssize nwrite; |
| 5203 | ngtcp2_crypto_aead *aead; |
| 5204 | ngtcp2_crypto_cipher *hp; |
| 5205 | ngtcp2_crypto_km *ckm; |
| 5206 | ngtcp2_crypto_cipher_ctx *hp_ctx; |
| 5207 | ngtcp2_hp_mask hp_mask; |
| 5208 | ngtcp2_decrypt decrypt; |
| 5209 | ngtcp2_pktns *pktns; |
| 5210 | ngtcp2_strm *crypto; |
| 5211 | ngtcp2_crypto_level crypto_level; |
| 5212 | int invalid_reserved_bits = 0; |
| 5213 | |
| 5214 | if (pktlen == 0) { |
| 5215 | return 0; |
| 5216 | } |
| 5217 | |
| 5218 | if (!(pkt[0] & NGTCP2_HEADER_FORM_BIT0x80)) { |
| 5219 | if (conn->state == NGTCP2_CS_SERVER_INITIAL) { |
| 5220 | /* Ignore Short packet unless server's first Handshake packet |
| 5221 | has been transmitted. */ |
| 5222 | return (ngtcp2_ssize)pktlen; |
| 5223 | } |
| 5224 | |
| 5225 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 5226 | "buffering Short packet len=%zu", pktlen); |
| 5227 | |
| 5228 | rv = conn_buffer_pkt(conn, &conn->pktns, path, pi, pkt, pktlen, dgramlen, |
| 5229 | ts); |
| 5230 | if (rv != 0) { |
| 5231 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 5232 | return rv; |
| 5233 | } |
| 5234 | return (ngtcp2_ssize)pktlen; |
| 5235 | } |
| 5236 | |
| 5237 | nread = ngtcp2_pkt_decode_hd_long(&hd, pkt, pktlen); |
| 5238 | if (nread < 0) { |
| 5239 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5240 | } |
| 5241 | |
| 5242 | switch (hd.type) { |
| 5243 | case NGTCP2_PKT_VERSION_NEGOTIATION: |
| 5244 | hdpktlen = (size_t)nread; |
| 5245 | |
| 5246 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 5247 | |
| 5248 | if (conn->server) { |
| 5249 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5250 | } |
| 5251 | |
| 5252 | /* Receiving Version Negotiation packet after getting Handshake |
| 5253 | packet from server is invalid. */ |
| 5254 | if (conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) { |
| 5255 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5256 | } |
| 5257 | |
| 5258 | if (!ngtcp2_cid_eq(&conn->oscid, &hd.dcid)) { |
| 5259 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5260 | "packet was ignored because of mismatched DCID"); |
| 5261 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5262 | } |
| 5263 | |
| 5264 | if (!ngtcp2_cid_eq(&conn->dcid.current.cid, &hd.scid)) { |
| 5265 | /* Just discard invalid Version Negotiation packet */ |
| 5266 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5267 | "packet was ignored because of mismatched SCID"); |
| 5268 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5269 | } |
| 5270 | rv = conn_on_version_negotiation(conn, &hd, pkt + hdpktlen, |
| 5271 | pktlen - hdpktlen); |
| 5272 | if (rv != 0) { |
| 5273 | if (ngtcp2_err_is_fatal(rv)) { |
| 5274 | return rv; |
| 5275 | } |
| 5276 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5277 | } |
| 5278 | return NGTCP2_ERR_RECV_VERSION_NEGOTIATION-229; |
| 5279 | case NGTCP2_PKT_RETRY: |
| 5280 | hdpktlen = (size_t)nread; |
| 5281 | |
| 5282 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 5283 | |
| 5284 | if (conn->server) { |
| 5285 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5286 | } |
| 5287 | |
| 5288 | /* Receiving Retry packet after getting Initial packet from server |
| 5289 | is invalid. */ |
| 5290 | if (conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) { |
| 5291 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5292 | } |
| 5293 | |
| 5294 | rv = conn_on_retry(conn, &hd, hdpktlen, pkt, pktlen); |
| 5295 | if (rv != 0) { |
| 5296 | if (ngtcp2_err_is_fatal(rv)) { |
| 5297 | return rv; |
| 5298 | } |
| 5299 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5300 | } |
| 5301 | return (ngtcp2_ssize)pktlen; |
| 5302 | } |
| 5303 | |
| 5304 | if (pktlen < (size_t)nread + hd.len) { |
| 5305 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5306 | } |
| 5307 | |
| 5308 | pktlen = (size_t)nread + hd.len; |
| 5309 | |
| 5310 | if (conn->version != hd.version) { |
| 5311 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5312 | } |
| 5313 | |
| 5314 | /* Quoted from spec: if subsequent packets of those types include a |
| 5315 | different Source Connection ID, they MUST be discarded. */ |
| 5316 | if ((conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) && |
| 5317 | !ngtcp2_cid_eq(&conn->dcid.current.cid, &hd.scid)) { |
| 5318 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 5319 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5320 | "packet was ignored because of mismatched SCID"); |
| 5321 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5322 | } |
| 5323 | |
| 5324 | switch (hd.type) { |
| 5325 | case NGTCP2_PKT_0RTT: |
| 5326 | if (!conn->server) { |
| 5327 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5328 | } |
| 5329 | if (conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) { |
| 5330 | if (conn->early.ckm) { |
| 5331 | ngtcp2_ssize nread2; |
| 5332 | /* TODO Avoid to parse header twice. */ |
| 5333 | nread2 = |
| 5334 | conn_recv_pkt(conn, path, pi, pkt, pktlen, dgramlen, pkt_ts, ts); |
| 5335 | if (nread2 < 0) { |
| 5336 | return nread2; |
| 5337 | } |
| 5338 | } |
| 5339 | |
| 5340 | /* Discard 0-RTT packet if we don't have a key to decrypt it. */ |
| 5341 | return (ngtcp2_ssize)pktlen; |
| 5342 | } |
| 5343 | |
| 5344 | /* Buffer re-ordered 0-RTT packet. */ |
| 5345 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 5346 | "buffering 0-RTT packet len=%zu", pktlen); |
| 5347 | |
| 5348 | rv = conn_buffer_pkt(conn, conn->in_pktns, path, pi, pkt, pktlen, dgramlen, |
| 5349 | ts); |
| 5350 | if (rv != 0) { |
| 5351 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 5352 | return rv; |
| 5353 | } |
| 5354 | |
| 5355 | return (ngtcp2_ssize)pktlen; |
| 5356 | case NGTCP2_PKT_INITIAL: |
| 5357 | if (!conn->in_pktns) { |
| 5358 | ngtcp2_log_info( |
| 5359 | &conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5360 | "Initial packet is discarded because keys have been discarded"); |
| 5361 | return (ngtcp2_ssize)pktlen; |
| 5362 | } |
| 5363 | |
| 5364 | assert(conn->in_pktns)((void) (0)); |
| 5365 | |
| 5366 | if (conn->server) { |
| 5367 | if (conn->local.settings.token.len) { |
| 5368 | rv = verify_token(&conn->local.settings.token, &hd); |
| 5369 | if (rv != 0) { |
| 5370 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5371 | "packet was ignored because token is invalid"); |
| 5372 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5373 | } |
| 5374 | } |
| 5375 | if ((conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) == 0) { |
| 5376 | /* Set rcid here so that it is available to callback. If this |
| 5377 | packet is discarded later in this function and no packet is |
| 5378 | processed in this connection attempt so far, connection |
| 5379 | will be dropped. */ |
| 5380 | conn->rcid = hd.dcid; |
| 5381 | |
| 5382 | rv = conn_call_recv_client_initial(conn, &hd.dcid); |
| 5383 | if (rv != 0) { |
| 5384 | return rv; |
| 5385 | } |
| 5386 | } |
| 5387 | } else if (hd.token.len != 0) { |
| 5388 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5389 | "packet was ignored because token is not empty"); |
| 5390 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5391 | } |
| 5392 | |
| 5393 | pktns = conn->in_pktns; |
| 5394 | crypto = &pktns->crypto.strm; |
| 5395 | crypto_level = NGTCP2_CRYPTO_LEVEL_INITIAL; |
| 5396 | |
| 5397 | break; |
| 5398 | case NGTCP2_PKT_HANDSHAKE: |
| 5399 | if (!conn->hs_pktns->crypto.rx.ckm) { |
| 5400 | if (conn->server) { |
| 5401 | ngtcp2_log_info( |
| 5402 | &conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5403 | "Handshake packet at this point is unexpected and discarded"); |
| 5404 | return (ngtcp2_ssize)pktlen; |
| 5405 | } |
| 5406 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 5407 | "buffering Handshake packet len=%zu", pktlen); |
| 5408 | |
| 5409 | rv = conn_buffer_pkt(conn, conn->hs_pktns, path, pi, pkt, pktlen, |
| 5410 | dgramlen, ts); |
| 5411 | if (rv != 0) { |
| 5412 | assert(ngtcp2_err_is_fatal(rv))((void) (0)); |
| 5413 | return rv; |
| 5414 | } |
| 5415 | return (ngtcp2_ssize)pktlen; |
| 5416 | } |
| 5417 | |
| 5418 | pktns = conn->hs_pktns; |
| 5419 | crypto = &pktns->crypto.strm; |
| 5420 | crypto_level = NGTCP2_CRYPTO_LEVEL_HANDSHAKE; |
| 5421 | |
| 5422 | break; |
| 5423 | default: |
| 5424 | /* unknown packet type */ |
| 5425 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5426 | "packet was ignored because of unknown packet type"); |
| 5427 | return (ngtcp2_ssize)pktlen; |
| 5428 | } |
| 5429 | |
| 5430 | hp_mask = conn->callbacks.hp_mask; |
| 5431 | decrypt = conn->callbacks.decrypt; |
| 5432 | aead = &pktns->crypto.ctx.aead; |
| 5433 | hp = &pktns->crypto.ctx.hp; |
| 5434 | ckm = pktns->crypto.rx.ckm; |
| 5435 | hp_ctx = &pktns->crypto.rx.hp_ctx; |
| 5436 | |
| 5437 | assert(ckm)((void) (0)); |
| 5438 | assert(hp_mask)((void) (0)); |
| 5439 | assert(decrypt)((void) (0)); |
| 5440 | |
| 5441 | rv = conn_ensure_decrypt_hp_buffer(conn, (size_t)nread + 4); |
| 5442 | if (rv != 0) { |
| 5443 | return rv; |
| 5444 | } |
| 5445 | |
| 5446 | nwrite = decrypt_hp(&hd, conn->crypto.decrypt_hp_buf.base, hp, pkt, pktlen, |
| 5447 | (size_t)nread, ckm, hp_ctx, hp_mask); |
| 5448 | if (nwrite < 0) { |
| 5449 | if (ngtcp2_err_is_fatal((int)nwrite)) { |
| 5450 | return nwrite; |
| 5451 | } |
| 5452 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5453 | "could not decrypt packet number"); |
| 5454 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5455 | } |
| 5456 | |
| 5457 | hdpktlen = (size_t)nwrite; |
| 5458 | payload = pkt + hdpktlen; |
| 5459 | payloadlen = hd.len - hd.pkt_numlen; |
| 5460 | |
| 5461 | hd.pkt_num = ngtcp2_pkt_adjust_pkt_num(pktns->rx.max_pkt_num, hd.pkt_num, |
| 5462 | pkt_num_bits(hd.pkt_numlen)); |
| 5463 | if (hd.pkt_num > NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1))) { |
| 5464 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5465 | "pkn=%" PRId64"l" "d" " is greater than maximum pkn", hd.pkt_num); |
| 5466 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5467 | } |
| 5468 | |
| 5469 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 5470 | |
| 5471 | rv = ngtcp2_pkt_verify_reserved_bits(conn->crypto.decrypt_hp_buf.base[0]); |
| 5472 | if (rv != 0) { |
| 5473 | invalid_reserved_bits = 1; |
| 5474 | |
| 5475 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5476 | "packet has incorrect reserved bits"); |
| 5477 | |
| 5478 | /* Will return error after decrypting payload */ |
| 5479 | } |
| 5480 | |
| 5481 | if (pktns_pkt_num_is_duplicate(pktns, hd.pkt_num)) { |
| 5482 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5483 | "packet was discarded because of duplicated packet number"); |
| 5484 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5485 | } |
| 5486 | |
| 5487 | rv = conn_ensure_decrypt_buffer(conn, payloadlen); |
| 5488 | if (rv != 0) { |
| 5489 | return rv; |
| 5490 | } |
| 5491 | |
| 5492 | nwrite = decrypt_pkt(conn->crypto.decrypt_buf.base, aead, payload, payloadlen, |
| 5493 | conn->crypto.decrypt_hp_buf.base, hdpktlen, hd.pkt_num, |
| 5494 | ckm, decrypt); |
| 5495 | if (nwrite < 0) { |
| 5496 | if (ngtcp2_err_is_fatal((int)nwrite)) { |
| 5497 | return nwrite; |
| 5498 | } |
| 5499 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5500 | "could not decrypt packet payload"); |
| 5501 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5502 | } |
| 5503 | |
| 5504 | if (invalid_reserved_bits) { |
| 5505 | return NGTCP2_ERR_PROTO-205; |
| 5506 | } |
| 5507 | |
| 5508 | payload = conn->crypto.decrypt_buf.base; |
| 5509 | payloadlen = (size_t)nwrite; |
| 5510 | |
| 5511 | switch (hd.type) { |
| 5512 | case NGTCP2_PKT_INITIAL: |
| 5513 | if (!conn->server || ((conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02) && |
| 5514 | !ngtcp2_cid_eq(&conn->rcid, &hd.dcid))) { |
| 5515 | rv = conn_verify_dcid(conn, NULL((void*)0), &hd); |
| 5516 | if (rv != 0) { |
| 5517 | if (ngtcp2_err_is_fatal(rv)) { |
| 5518 | return rv; |
| 5519 | } |
| 5520 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5521 | "packet was ignored because of mismatched DCID"); |
| 5522 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5523 | } |
| 5524 | } |
| 5525 | break; |
| 5526 | case NGTCP2_PKT_HANDSHAKE: |
| 5527 | rv = conn_verify_dcid(conn, NULL((void*)0), &hd); |
| 5528 | if (rv != 0) { |
| 5529 | if (ngtcp2_err_is_fatal(rv)) { |
| 5530 | return rv; |
| 5531 | } |
| 5532 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5533 | "packet was ignored because of mismatched DCID"); |
| 5534 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5535 | } |
| 5536 | break; |
| 5537 | default: |
| 5538 | assert(0)((void) (0)); |
| 5539 | } |
| 5540 | |
| 5541 | if (payloadlen == 0) { |
| 5542 | /* QUIC packet must contain at least one frame */ |
| 5543 | if (hd.type == NGTCP2_PKT_INITIAL) { |
| 5544 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 5545 | } |
| 5546 | return NGTCP2_ERR_PROTO-205; |
| 5547 | } |
| 5548 | |
| 5549 | if (hd.type == NGTCP2_PKT_INITIAL && |
| 5550 | !(conn->flags & NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02)) { |
| 5551 | conn->flags |= NGTCP2_CONN_FLAG_CONN_ID_NEGOTIATED0x02; |
| 5552 | if (!conn->server) { |
| 5553 | conn->dcid.current.cid = hd.scid; |
| 5554 | } |
| 5555 | } |
| 5556 | |
| 5557 | ngtcp2_qlog_pkt_received_start(&conn->qlog); |
| 5558 | |
| 5559 | for (; payloadlen;) { |
| 5560 | nread = ngtcp2_pkt_decode_frame(fr, payload, payloadlen); |
| 5561 | if (nread < 0) { |
| 5562 | return nread; |
| 5563 | } |
| 5564 | |
| 5565 | payload += nread; |
| 5566 | payloadlen -= (size_t)nread; |
| 5567 | |
| 5568 | switch (fr->type) { |
| 5569 | case NGTCP2_FRAME_ACK: |
| 5570 | case NGTCP2_FRAME_ACK_ECN: |
| 5571 | fr->ack.ack_delay = 0; |
| 5572 | fr->ack.ack_delay_unscaled = 0; |
| 5573 | break; |
| 5574 | } |
| 5575 | |
| 5576 | ngtcp2_log_rx_fr(&conn->log, &hd, fr); |
| 5577 | |
| 5578 | switch (fr->type) { |
| 5579 | case NGTCP2_FRAME_ACK: |
| 5580 | case NGTCP2_FRAME_ACK_ECN: |
| 5581 | if (!conn->server && hd.type == NGTCP2_PKT_HANDSHAKE) { |
| 5582 | conn->flags |= NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000; |
| 5583 | } |
| 5584 | rv = conn_recv_ack(conn, pktns, &fr->ack, pkt_ts, ts); |
| 5585 | if (rv != 0) { |
| 5586 | return rv; |
| 5587 | } |
| 5588 | break; |
| 5589 | case NGTCP2_FRAME_PADDING: |
| 5590 | break; |
| 5591 | case NGTCP2_FRAME_CRYPTO: |
| 5592 | rv = conn_recv_crypto(conn, crypto_level, crypto, &fr->crypto); |
| 5593 | if (rv != 0) { |
| 5594 | return rv; |
| 5595 | } |
| 5596 | require_ack = 1; |
| 5597 | break; |
| 5598 | case NGTCP2_FRAME_CONNECTION_CLOSE: |
| 5599 | conn_recv_connection_close(conn, &fr->connection_close); |
| 5600 | break; |
| 5601 | case NGTCP2_FRAME_PING: |
| 5602 | require_ack = 1; |
| 5603 | break; |
| 5604 | default: |
| 5605 | return NGTCP2_ERR_PROTO-205; |
| 5606 | } |
| 5607 | |
| 5608 | ngtcp2_qlog_write_frame(&conn->qlog, fr); |
| 5609 | } |
| 5610 | |
| 5611 | if (conn->server && hd.type == NGTCP2_PKT_HANDSHAKE) { |
| 5612 | /* Successful processing of Handshake packet from client verifies |
| 5613 | source address. */ |
| 5614 | conn->dcid.current.flags |= NGTCP2_DCID_FLAG_PATH_VALIDATED0x01; |
| 5615 | } |
| 5616 | |
| 5617 | ngtcp2_qlog_pkt_received_end(&conn->qlog, &hd, pktlen); |
| 5618 | |
| 5619 | rv = pktns_commit_recv_pkt_num(pktns, hd.pkt_num, require_ack, pkt_ts); |
| 5620 | if (rv != 0) { |
| 5621 | return rv; |
| 5622 | } |
| 5623 | |
| 5624 | pktns_increase_ecn_counts(pktns, pi); |
| 5625 | |
| 5626 | /* TODO Initial and Handshake are always acknowledged without |
| 5627 | delay. */ |
| 5628 | if (require_ack && |
| 5629 | (++pktns->acktr.rx_npkt >= conn->local.settings.ack_thresh || |
| 5630 | (pi->ecn & NGTCP2_ECN_MASK0x3) == NGTCP2_ECN_CE0x3)) { |
| 5631 | ngtcp2_acktr_immediate_ack(&pktns->acktr); |
| 5632 | } |
| 5633 | |
| 5634 | rv = ngtcp2_conn_sched_ack(conn, &pktns->acktr, hd.pkt_num, require_ack, |
| 5635 | pkt_ts); |
| 5636 | if (rv != 0) { |
| 5637 | return rv; |
| 5638 | } |
| 5639 | |
| 5640 | conn_restart_timer_on_read(conn, ts); |
| 5641 | |
| 5642 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 5643 | |
| 5644 | return conn->state == NGTCP2_CS_DRAINING ? NGTCP2_ERR_DRAINING-231 |
| 5645 | : (ngtcp2_ssize)pktlen; |
| 5646 | } |
| 5647 | |
| 5648 | /* |
| 5649 | * conn_recv_handshake_cpkt processes compound packet during |
| 5650 | * handshake. The buffer pointed by |pkt| might contain multiple |
| 5651 | * packets. The Short packet must be the last one because it does not |
| 5652 | * have payload length field. |
| 5653 | * |
| 5654 | * This function returns the same error code returned by |
| 5655 | * conn_recv_handshake_pkt. |
| 5656 | */ |
| 5657 | static int conn_recv_handshake_cpkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 5658 | const ngtcp2_pkt_info *pi, |
| 5659 | const uint8_t *pkt, size_t pktlen, |
| 5660 | ngtcp2_tstamp ts) { |
| 5661 | ngtcp2_ssize nread; |
| 5662 | size_t dgramlen = pktlen; |
| 5663 | |
| 5664 | if (ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 5665 | conn->dcid.current.bytes_recv += dgramlen; |
| 5666 | } |
| 5667 | |
| 5668 | while (pktlen) { |
| 5669 | nread = |
| 5670 | conn_recv_handshake_pkt(conn, path, pi, pkt, pktlen, dgramlen, ts, ts); |
| 5671 | if (nread < 0) { |
| 5672 | if (ngtcp2_err_is_fatal((int)nread)) { |
| 5673 | return (int)nread; |
| 5674 | } |
| 5675 | |
| 5676 | if (nread == NGTCP2_ERR_DRAINING-231) { |
| 5677 | return NGTCP2_ERR_DRAINING-231; |
| 5678 | } |
| 5679 | |
| 5680 | if ((pkt[0] & NGTCP2_HEADER_FORM_BIT0x80) && |
| 5681 | /* Not a Version Negotiation packet */ |
| 5682 | pktlen > 4 && ngtcp2_get_uint32(&pkt[1]) > 0 && |
| 5683 | ngtcp2_pkt_get_type_long(pkt[0]) == NGTCP2_PKT_INITIAL) { |
| 5684 | if (conn->server) { |
| 5685 | /* If server discards first Initial, then drop connection |
| 5686 | state. This is because SCID in packet might be corrupted |
| 5687 | and the current connection state might wrongly discard |
| 5688 | valid packet and prevent the handshake from |
| 5689 | completing. */ |
| 5690 | if (conn->in_pktns && conn->in_pktns->rx.max_pkt_num == -1) { |
| 5691 | /* If this is crypto related error, then return normally |
| 5692 | in order to send CONNECTION_CLOSE with TLS alert (e.g., |
| 5693 | no_application_protocol). */ |
| 5694 | switch (nread) { |
| 5695 | case NGTCP2_ERR_CRYPTO-215: |
| 5696 | case NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM-217: |
| 5697 | case NGTCP2_ERR_MALFORMED_TRANSPORT_PARAM-218: |
| 5698 | case NGTCP2_ERR_TRANSPORT_PARAM-234: |
| 5699 | return (int)nread; |
| 5700 | } |
| 5701 | |
| 5702 | return NGTCP2_ERR_DROP_CONN-242; |
| 5703 | } |
| 5704 | return 0; |
| 5705 | } |
| 5706 | /* client */ |
| 5707 | if (nread == NGTCP2_ERR_CRYPTO-215) { |
| 5708 | /* If client gets crypto error from TLS stack, it is |
| 5709 | unrecoverable, therefore drop connection. */ |
| 5710 | return (int)nread; |
| 5711 | } |
| 5712 | return 0; |
| 5713 | } |
| 5714 | |
| 5715 | if (nread == NGTCP2_ERR_DISCARD_PKT-235) { |
| 5716 | return 0; |
| 5717 | } |
| 5718 | |
| 5719 | return (int)nread; |
| 5720 | } |
| 5721 | |
| 5722 | assert(pktlen >= (size_t)nread)((void) (0)); |
| 5723 | pkt += nread; |
| 5724 | pktlen -= (size_t)nread; |
| 5725 | |
| 5726 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 5727 | "read packet %td left %zu", nread, pktlen); |
| 5728 | } |
| 5729 | |
| 5730 | return 0; |
| 5731 | } |
| 5732 | |
| 5733 | int ngtcp2_conn_init_stream(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 5734 | int64_t stream_id, void *stream_user_data) { |
| 5735 | int rv; |
| 5736 | uint64_t max_rx_offset; |
| 5737 | uint64_t max_tx_offset; |
| 5738 | int local_stream = conn_local_stream(conn, stream_id); |
| 5739 | |
| 5740 | if (bidi_stream(stream_id)) { |
| 5741 | if (local_stream) { |
| 5742 | max_rx_offset = |
| 5743 | conn->local.transport_params.initial_max_stream_data_bidi_local; |
| 5744 | max_tx_offset = |
| 5745 | conn->remote.transport_params.initial_max_stream_data_bidi_remote; |
| 5746 | } else { |
| 5747 | max_rx_offset = |
| 5748 | conn->local.transport_params.initial_max_stream_data_bidi_remote; |
| 5749 | max_tx_offset = |
| 5750 | conn->remote.transport_params.initial_max_stream_data_bidi_local; |
| 5751 | } |
| 5752 | } else if (local_stream) { |
| 5753 | max_rx_offset = 0; |
| 5754 | max_tx_offset = conn->remote.transport_params.initial_max_stream_data_uni; |
| 5755 | } else { |
| 5756 | max_rx_offset = conn->local.transport_params.initial_max_stream_data_uni; |
| 5757 | max_tx_offset = 0; |
| 5758 | } |
| 5759 | |
| 5760 | rv = ngtcp2_strm_init(strm, stream_id, NGTCP2_STRM_FLAG_NONE0x00, max_rx_offset, |
| 5761 | max_tx_offset, stream_user_data, conn->mem); |
| 5762 | if (rv != 0) { |
| 5763 | return rv; |
| 5764 | } |
| 5765 | |
| 5766 | rv = ngtcp2_map_insert(&conn->strms, &strm->me); |
| 5767 | if (rv != 0) { |
| 5768 | assert(rv != NGTCP2_ERR_INVALID_ARGUMENT)((void) (0)); |
| 5769 | goto fail; |
| 5770 | } |
| 5771 | |
| 5772 | if (!conn_local_stream(conn, stream_id)) { |
| 5773 | rv = conn_call_stream_open(conn, strm); |
| 5774 | if (rv != 0) { |
| 5775 | goto fail; |
| 5776 | } |
| 5777 | } |
| 5778 | |
| 5779 | return 0; |
| 5780 | |
| 5781 | fail: |
| 5782 | ngtcp2_strm_free(strm); |
| 5783 | return rv; |
| 5784 | } |
| 5785 | |
| 5786 | /* |
| 5787 | * conn_emit_pending_stream_data passes buffered ordered stream data |
| 5788 | * to the application. |rx_offset| is the first offset to deliver to |
| 5789 | * the application. This function assumes that the data up to |
| 5790 | * |rx_offset| has been delivered already. This function only passes |
| 5791 | * the ordered data without any gap. If there is a gap, it stops |
| 5792 | * providing the data to the application, and returns. |
| 5793 | * |
| 5794 | * This function returns 0 if it succeeds, or one of the following |
| 5795 | * negative error codes: |
| 5796 | * |
| 5797 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 5798 | * User callback failed. |
| 5799 | * NGTCP2_ERR_NOMEM |
| 5800 | * Out of memory. |
| 5801 | */ |
| 5802 | static int conn_emit_pending_stream_data(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 5803 | uint64_t rx_offset) { |
| 5804 | size_t datalen; |
| 5805 | const uint8_t *data; |
| 5806 | int rv; |
| 5807 | uint64_t offset; |
| 5808 | uint32_t sdflags; |
| 5809 | int handshake_completed = conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01; |
| 5810 | |
| 5811 | if (!strm->rx.rob) { |
| 5812 | return 0; |
| 5813 | } |
| 5814 | |
| 5815 | for (;;) { |
| 5816 | /* Stop calling callback if application has called |
| 5817 | ngtcp2_conn_shutdown_stream_read() inside the callback. |
| 5818 | Because it doubly counts connection window. */ |
| 5819 | if (strm->flags & (NGTCP2_STRM_FLAG_STOP_SENDING0x10)) { |
| 5820 | return 0; |
| 5821 | } |
| 5822 | |
| 5823 | datalen = ngtcp2_rob_data_at(strm->rx.rob, &data, rx_offset); |
| 5824 | if (datalen == 0) { |
| 5825 | assert(rx_offset == ngtcp2_strm_rx_offset(strm))((void) (0)); |
| 5826 | return 0; |
| 5827 | } |
| 5828 | |
| 5829 | offset = rx_offset; |
| 5830 | rx_offset += datalen; |
| 5831 | |
| 5832 | sdflags = NGTCP2_STREAM_DATA_FLAG_NONE0x00; |
| 5833 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) && |
| 5834 | rx_offset == strm->rx.last_offset) { |
| 5835 | sdflags |= NGTCP2_STREAM_DATA_FLAG_FIN0x01; |
| 5836 | } |
| 5837 | if (!handshake_completed) { |
| 5838 | sdflags |= NGTCP2_STREAM_DATA_FLAG_EARLY0x02; |
| 5839 | } |
| 5840 | |
| 5841 | rv = conn_call_recv_stream_data(conn, strm, sdflags, offset, data, datalen); |
| 5842 | if (rv != 0) { |
| 5843 | return rv; |
| 5844 | } |
| 5845 | |
| 5846 | ngtcp2_rob_pop(strm->rx.rob, rx_offset - datalen, datalen); |
| 5847 | } |
| 5848 | } |
| 5849 | |
| 5850 | /* |
| 5851 | * conn_recv_crypto is called when CRYPTO frame |fr| is received. |
| 5852 | * |rx_offset_base| is the offset in the entire TLS handshake stream. |
| 5853 | * fr->offset specifies the offset in each encryption level. |
| 5854 | * |max_rx_offset| is, if it is nonzero, the maximum offset in the |
| 5855 | * entire TLS handshake stream that |fr| can carry. |crypto_level| is |
| 5856 | * the encryption level where this data is received. |
| 5857 | * |
| 5858 | * This function returns 0 if it succeeds, or one of the following |
| 5859 | * negative error codes: |
| 5860 | * |
| 5861 | * NGTCP2_ERR_PROTO |
| 5862 | * CRYPTO frame has invalid offset. |
| 5863 | * NGTCP2_ERR_NOMEM |
| 5864 | * Out of memory. |
| 5865 | * NGTCP2_ERR_CRYPTO |
| 5866 | * TLS stack reported error. |
| 5867 | * NGTCP2_ERR_FRAME_ENCODING |
| 5868 | * The end offset exceeds the maximum value. |
| 5869 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 5870 | * User-defined callback function failed. |
| 5871 | */ |
| 5872 | static int conn_recv_crypto(ngtcp2_conn *conn, ngtcp2_crypto_level crypto_level, |
| 5873 | ngtcp2_strm *crypto, const ngtcp2_crypto *fr) { |
| 5874 | uint64_t fr_end_offset; |
| 5875 | uint64_t rx_offset; |
| 5876 | int rv; |
| 5877 | |
| 5878 | if (fr->datacnt == 0) { |
| 5879 | return 0; |
| 5880 | } |
| 5881 | |
| 5882 | fr_end_offset = fr->offset + fr->data[0].len; |
| 5883 | |
| 5884 | if (NGTCP2_MAX_VARINT((1ULL << 62) - 1) < fr_end_offset) { |
| 5885 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 5886 | } |
| 5887 | |
| 5888 | rx_offset = ngtcp2_strm_rx_offset(crypto); |
| 5889 | |
| 5890 | if (fr_end_offset <= rx_offset) { |
| 5891 | if (conn->server && |
| 5892 | !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_EARLY_RETRANSMIT0x0200) && |
| 5893 | crypto_level == NGTCP2_CRYPTO_LEVEL_INITIAL) { |
| 5894 | /* recovery draft: Speeding Up Handshake Completion |
| 5895 | |
| 5896 | When a server receives an Initial packet containing duplicate |
| 5897 | CRYPTO data, it can assume the client did not receive all of |
| 5898 | the server's CRYPTO data sent in Initial packets, or the |
| 5899 | client's estimated RTT is too small. ... To speed up |
| 5900 | handshake completion under these conditions, an endpoint MAY |
| 5901 | send a packet containing unacknowledged CRYPTO data earlier |
| 5902 | than the PTO expiry, subject to address validation limits; |
| 5903 | ... */ |
| 5904 | conn->flags |= NGTCP2_CONN_FLAG_HANDSHAKE_EARLY_RETRANSMIT0x0200; |
| 5905 | conn->in_pktns->rtb.probe_pkt_left = 1; |
| 5906 | conn->hs_pktns->rtb.probe_pkt_left = 1; |
| 5907 | } |
| 5908 | return 0; |
| 5909 | } |
| 5910 | |
| 5911 | crypto->rx.last_offset = ngtcp2_max(crypto->rx.last_offset, fr_end_offset)((crypto->rx.last_offset) > (fr_end_offset) ? (crypto-> rx.last_offset) : (fr_end_offset)); |
| 5912 | |
| 5913 | /* TODO Before dispatching incoming data to TLS stack, make sure |
| 5914 | that previous data in previous encryption level has been |
| 5915 | completely sent to TLS stack. Usually, if data is left, it is an |
| 5916 | error because key is generated after consuming all data in the |
| 5917 | previous encryption level. */ |
| 5918 | if (fr->offset <= rx_offset) { |
| 5919 | size_t ncut = (size_t)(rx_offset - fr->offset); |
| 5920 | const uint8_t *data = fr->data[0].base + ncut; |
| 5921 | size_t datalen = fr->data[0].len - ncut; |
| 5922 | uint64_t offset = rx_offset; |
| 5923 | |
| 5924 | rx_offset += datalen; |
| 5925 | rv = ngtcp2_strm_update_rx_offset(crypto, rx_offset); |
| 5926 | if (rv != 0) { |
| 5927 | return rv; |
| 5928 | } |
| 5929 | |
| 5930 | rv = conn_call_recv_crypto_data(conn, crypto_level, offset, data, datalen); |
| 5931 | if (rv != 0) { |
| 5932 | return rv; |
| 5933 | } |
| 5934 | |
| 5935 | rv = conn_emit_pending_crypto_data(conn, crypto_level, crypto, rx_offset); |
| 5936 | if (rv != 0) { |
| 5937 | return rv; |
| 5938 | } |
| 5939 | |
| 5940 | return 0; |
| 5941 | } |
| 5942 | |
| 5943 | if (fr_end_offset - rx_offset > NGTCP2_MAX_REORDERED_CRYPTO_DATA65536) { |
| 5944 | return NGTCP2_ERR_CRYPTO_BUFFER_EXCEEDED-239; |
| 5945 | } |
| 5946 | |
| 5947 | return ngtcp2_strm_recv_reordering(crypto, fr->data[0].base, fr->data[0].len, |
| 5948 | fr->offset); |
| 5949 | } |
| 5950 | |
| 5951 | /* |
| 5952 | * conn_max_data_violated returns nonzero if receiving |datalen| |
| 5953 | * violates connection flow control on local endpoint. |
| 5954 | */ |
| 5955 | static int conn_max_data_violated(ngtcp2_conn *conn, uint64_t datalen) { |
| 5956 | return conn->rx.max_offset - conn->rx.offset < datalen; |
| 5957 | } |
| 5958 | |
| 5959 | /* |
| 5960 | * conn_recv_stream is called when STREAM frame |fr| is received. |
| 5961 | * |
| 5962 | * This function returns 0 if it succeeds, or one of the following |
| 5963 | * negative error codes: |
| 5964 | * |
| 5965 | * NGTCP2_ERR_STREAM_STATE |
| 5966 | * STREAM frame is received for a local stream which is not |
| 5967 | * initiated; or STREAM frame is received for a local |
| 5968 | * unidirectional stream |
| 5969 | * NGTCP2_ERR_STREAM_LIMIT |
| 5970 | * STREAM frame has remote stream ID which is strictly greater |
| 5971 | * than the allowed limit. |
| 5972 | * NGTCP2_ERR_NOMEM |
| 5973 | * Out of memory. |
| 5974 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 5975 | * User-defined callback function failed. |
| 5976 | * NGTCP2_ERR_FLOW_CONTROL |
| 5977 | * Flow control limit is violated; or the end offset of stream |
| 5978 | * data is beyond the NGTCP2_MAX_VARINT. |
| 5979 | * NGTCP2_ERR_FINAL_SIZE |
| 5980 | * STREAM frame has strictly larger end offset than it is |
| 5981 | * permitted. |
| 5982 | */ |
| 5983 | static int conn_recv_stream(ngtcp2_conn *conn, const ngtcp2_stream *fr) { |
| 5984 | int rv; |
| 5985 | ngtcp2_strm *strm; |
| 5986 | ngtcp2_idtr *idtr; |
| 5987 | uint64_t rx_offset, fr_end_offset; |
| 5988 | int local_stream; |
| 5989 | int bidi; |
| 5990 | size_t datalen = ngtcp2_vec_len(fr->data, fr->datacnt); |
| 5991 | uint32_t sdflags = NGTCP2_STREAM_DATA_FLAG_NONE0x00; |
| 5992 | |
| 5993 | local_stream = conn_local_stream(conn, fr->stream_id); |
| 5994 | bidi = bidi_stream(fr->stream_id); |
| 5995 | |
| 5996 | if (bidi) { |
| 5997 | if (local_stream) { |
| 5998 | if (conn->local.bidi.next_stream_id <= fr->stream_id) { |
| 5999 | return NGTCP2_ERR_STREAM_STATE-226; |
| 6000 | } |
| 6001 | } else if (conn->remote.bidi.max_streams < |
| 6002 | ngtcp2_ord_stream_id(fr->stream_id)) { |
| 6003 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 6004 | } |
| 6005 | |
| 6006 | idtr = &conn->remote.bidi.idtr; |
| 6007 | } else { |
| 6008 | if (local_stream) { |
| 6009 | return NGTCP2_ERR_STREAM_STATE-226; |
| 6010 | } |
| 6011 | if (conn->remote.uni.max_streams < ngtcp2_ord_stream_id(fr->stream_id)) { |
| 6012 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 6013 | } |
| 6014 | |
| 6015 | idtr = &conn->remote.uni.idtr; |
| 6016 | } |
| 6017 | |
| 6018 | if (NGTCP2_MAX_VARINT((1ULL << 62) - 1) - datalen < fr->offset) { |
| 6019 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6020 | } |
| 6021 | |
| 6022 | strm = ngtcp2_conn_find_stream(conn, fr->stream_id); |
| 6023 | if (strm == NULL((void*)0)) { |
| 6024 | if (local_stream) { |
| 6025 | /* TODO The stream has been closed. This should be responded |
| 6026 | with RESET_STREAM, or simply ignored. */ |
| 6027 | return 0; |
| 6028 | } |
| 6029 | |
| 6030 | rv = ngtcp2_idtr_open(idtr, fr->stream_id); |
| 6031 | if (rv != 0) { |
| 6032 | if (ngtcp2_err_is_fatal(rv)) { |
| 6033 | return rv; |
| 6034 | } |
| 6035 | assert(rv == NGTCP2_ERR_STREAM_IN_USE)((void) (0)); |
| 6036 | /* TODO The stream has been closed. This should be responded |
| 6037 | with RESET_STREAM, or simply ignored. */ |
| 6038 | return 0; |
| 6039 | } |
| 6040 | |
| 6041 | strm = ngtcp2_mem_malloc(conn->mem, sizeof(ngtcp2_strm)); |
| 6042 | if (strm == NULL((void*)0)) { |
| 6043 | return NGTCP2_ERR_NOMEM-501; |
| 6044 | } |
| 6045 | /* TODO Perhaps, call new_stream callback? */ |
| 6046 | rv = ngtcp2_conn_init_stream(conn, strm, fr->stream_id, NULL((void*)0)); |
| 6047 | if (rv != 0) { |
| 6048 | ngtcp2_mem_free(conn->mem, strm); |
| 6049 | return rv; |
| 6050 | } |
| 6051 | if (!bidi) { |
| 6052 | ngtcp2_strm_shutdown(strm, NGTCP2_STRM_FLAG_SHUT_WR0x02); |
| 6053 | } |
| 6054 | } |
| 6055 | |
| 6056 | fr_end_offset = fr->offset + datalen; |
| 6057 | |
| 6058 | if (strm->rx.max_offset < fr_end_offset) { |
| 6059 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6060 | } |
| 6061 | |
| 6062 | if (strm->rx.last_offset < fr_end_offset) { |
| 6063 | uint64_t len = fr_end_offset - strm->rx.last_offset; |
| 6064 | |
| 6065 | if (conn_max_data_violated(conn, len)) { |
| 6066 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6067 | } |
| 6068 | |
| 6069 | conn->rx.offset += len; |
| 6070 | |
| 6071 | if (strm->flags & NGTCP2_STRM_FLAG_STOP_SENDING0x10) { |
| 6072 | ngtcp2_conn_extend_max_offset(conn, len); |
| 6073 | } |
| 6074 | } |
| 6075 | |
| 6076 | rx_offset = ngtcp2_strm_rx_offset(strm); |
| 6077 | |
| 6078 | if (fr->fin) { |
| 6079 | if (strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) { |
| 6080 | if (strm->rx.last_offset != fr_end_offset) { |
| 6081 | return NGTCP2_ERR_FINAL_SIZE-214; |
| 6082 | } |
| 6083 | |
| 6084 | if (strm->flags & |
| 6085 | (NGTCP2_STRM_FLAG_STOP_SENDING0x10 | NGTCP2_STRM_FLAG_RECV_RST0x08)) { |
| 6086 | return 0; |
| 6087 | } |
| 6088 | |
| 6089 | if (rx_offset == fr_end_offset) { |
| 6090 | return 0; |
| 6091 | } |
| 6092 | } else if (strm->rx.last_offset > fr_end_offset) { |
| 6093 | return NGTCP2_ERR_FINAL_SIZE-214; |
| 6094 | } else { |
| 6095 | strm->rx.last_offset = fr_end_offset; |
| 6096 | |
| 6097 | ngtcp2_strm_shutdown(strm, NGTCP2_STRM_FLAG_SHUT_RD0x01); |
| 6098 | |
| 6099 | if (strm->flags & NGTCP2_STRM_FLAG_STOP_SENDING0x10) { |
| 6100 | return ngtcp2_conn_close_stream_if_shut_rdwr(conn, strm, |
| 6101 | strm->app_error_code); |
| 6102 | } |
| 6103 | } |
| 6104 | } else { |
| 6105 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) && |
| 6106 | strm->rx.last_offset < fr_end_offset) { |
| 6107 | return NGTCP2_ERR_FINAL_SIZE-214; |
| 6108 | } |
| 6109 | |
| 6110 | strm->rx.last_offset = ngtcp2_max(strm->rx.last_offset, fr_end_offset)((strm->rx.last_offset) > (fr_end_offset) ? (strm->rx .last_offset) : (fr_end_offset)); |
| 6111 | |
| 6112 | if (fr_end_offset <= rx_offset) { |
| 6113 | return 0; |
| 6114 | } |
| 6115 | |
| 6116 | if (strm->flags & |
| 6117 | (NGTCP2_STRM_FLAG_STOP_SENDING0x10 | NGTCP2_STRM_FLAG_RECV_RST0x08)) { |
| 6118 | return 0; |
| 6119 | } |
| 6120 | } |
| 6121 | |
| 6122 | if (fr->offset <= rx_offset) { |
| 6123 | size_t ncut = (size_t)(rx_offset - fr->offset); |
| 6124 | uint64_t offset = rx_offset; |
| 6125 | const uint8_t *data; |
| 6126 | int fin; |
| 6127 | |
| 6128 | if (fr->datacnt) { |
| 6129 | data = fr->data[0].base + ncut; |
| 6130 | datalen -= ncut; |
| 6131 | |
| 6132 | rx_offset += datalen; |
| 6133 | rv = ngtcp2_strm_update_rx_offset(strm, rx_offset); |
| 6134 | if (rv != 0) { |
| 6135 | return rv; |
| 6136 | } |
| 6137 | } else { |
| 6138 | data = NULL((void*)0); |
| 6139 | datalen = 0; |
| 6140 | } |
| 6141 | |
| 6142 | fin = (strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) && |
| 6143 | rx_offset == strm->rx.last_offset; |
| 6144 | |
| 6145 | if (fin || datalen) { |
| 6146 | if (fin) { |
| 6147 | sdflags |= NGTCP2_STREAM_DATA_FLAG_FIN0x01; |
| 6148 | } |
| 6149 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 6150 | sdflags |= NGTCP2_STREAM_DATA_FLAG_EARLY0x02; |
| 6151 | } |
| 6152 | rv = conn_call_recv_stream_data(conn, strm, sdflags, offset, data, |
| 6153 | datalen); |
| 6154 | if (rv != 0) { |
| 6155 | return rv; |
| 6156 | } |
| 6157 | |
| 6158 | rv = conn_emit_pending_stream_data(conn, strm, rx_offset); |
| 6159 | if (rv != 0) { |
| 6160 | return rv; |
| 6161 | } |
| 6162 | } |
| 6163 | } else if (fr->datacnt) { |
| 6164 | rv = ngtcp2_strm_recv_reordering(strm, fr->data[0].base, fr->data[0].len, |
| 6165 | fr->offset); |
| 6166 | if (rv != 0) { |
| 6167 | return rv; |
| 6168 | } |
| 6169 | } |
| 6170 | return ngtcp2_conn_close_stream_if_shut_rdwr(conn, strm, NGTCP2_NO_ERROR0x0u); |
| 6171 | } |
| 6172 | |
| 6173 | /* |
| 6174 | * conn_reset_stream adds RESET_STREAM frame to the transmission |
| 6175 | * queue. |
| 6176 | * |
| 6177 | * This function returns 0 if it succeeds, or one of the following |
| 6178 | * negative error codes: |
| 6179 | * |
| 6180 | * NGTCP2_ERR_NOMEM |
| 6181 | * Out of memory. |
| 6182 | */ |
| 6183 | static int conn_reset_stream(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 6184 | uint64_t app_error_code) { |
| 6185 | int rv; |
| 6186 | ngtcp2_frame_chain *frc; |
| 6187 | ngtcp2_pktns *pktns = &conn->pktns; |
| 6188 | |
| 6189 | rv = ngtcp2_frame_chain_new(&frc, conn->mem); |
| 6190 | if (rv != 0) { |
| 6191 | return rv; |
| 6192 | } |
| 6193 | |
| 6194 | frc->fr.type = NGTCP2_FRAME_RESET_STREAM; |
| 6195 | frc->fr.reset_stream.stream_id = strm->stream_id; |
| 6196 | frc->fr.reset_stream.app_error_code = app_error_code; |
| 6197 | frc->fr.reset_stream.final_size = strm->tx.offset; |
| 6198 | |
| 6199 | /* TODO This prepends RESET_STREAM to pktns->tx.frq. */ |
| 6200 | frc->next = pktns->tx.frq; |
| 6201 | pktns->tx.frq = frc; |
| 6202 | |
| 6203 | return 0; |
| 6204 | } |
| 6205 | |
| 6206 | /* |
| 6207 | * conn_stop_sending adds STOP_SENDING frame to the transmission |
| 6208 | * queue. |
| 6209 | * |
| 6210 | * This function returns 0 if it succeeds, or one of the following |
| 6211 | * negative error codes: |
| 6212 | * |
| 6213 | * NGTCP2_ERR_NOMEM |
| 6214 | * Out of memory. |
| 6215 | */ |
| 6216 | static int conn_stop_sending(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 6217 | uint64_t app_error_code) { |
| 6218 | int rv; |
| 6219 | ngtcp2_frame_chain *frc; |
| 6220 | ngtcp2_pktns *pktns = &conn->pktns; |
| 6221 | |
| 6222 | rv = ngtcp2_frame_chain_new(&frc, conn->mem); |
| 6223 | if (rv != 0) { |
| 6224 | return rv; |
| 6225 | } |
| 6226 | |
| 6227 | frc->fr.type = NGTCP2_FRAME_STOP_SENDING; |
| 6228 | frc->fr.stop_sending.stream_id = strm->stream_id; |
| 6229 | frc->fr.stop_sending.app_error_code = app_error_code; |
| 6230 | |
| 6231 | /* TODO This prepends STOP_SENDING to pktns->tx.frq. */ |
| 6232 | frc->next = pktns->tx.frq; |
| 6233 | pktns->tx.frq = frc; |
| 6234 | |
| 6235 | return 0; |
| 6236 | } |
| 6237 | |
| 6238 | /* |
| 6239 | * handle_max_remote_streams_extension extends |
| 6240 | * |*punsent_max_remote_streams| by |n| if a condition allows it. |
| 6241 | */ |
| 6242 | static void |
| 6243 | handle_max_remote_streams_extension(uint64_t *punsent_max_remote_streams, |
| 6244 | size_t n) { |
| 6245 | if ( |
| 6246 | #if SIZE_MAX(18446744073709551615UL) > UINT32_MAX(4294967295U) |
| 6247 | NGTCP2_MAX_STREAMS(1LL << 60) < n || |
| 6248 | #endif /* SIZE_MAX > UINT32_MAX */ |
| 6249 | *punsent_max_remote_streams > (uint64_t)(NGTCP2_MAX_STREAMS(1LL << 60) - n)) { |
| 6250 | *punsent_max_remote_streams = NGTCP2_MAX_STREAMS(1LL << 60); |
| 6251 | } else { |
| 6252 | *punsent_max_remote_streams += n; |
| 6253 | } |
| 6254 | } |
| 6255 | |
| 6256 | /* |
| 6257 | * conn_recv_reset_stream is called when RESET_STREAM |fr| is |
| 6258 | * received. |
| 6259 | * |
| 6260 | * This function returns 0 if it succeeds, or one of the following |
| 6261 | * negative error codes: |
| 6262 | * |
| 6263 | * NGTCP2_ERR_STREAM_STATE |
| 6264 | * RESET_STREAM frame is received to the local stream which is not |
| 6265 | * initiated. |
| 6266 | * NGTCP2_ERR_STREAM_LIMIT |
| 6267 | * RESET_STREAM frame has remote stream ID which is strictly |
| 6268 | * greater than the allowed limit. |
| 6269 | * NGTCP2_ERR_PROTO |
| 6270 | * RESET_STREAM frame is received to the local unidirectional |
| 6271 | * stream |
| 6272 | * NGTCP2_ERR_NOMEM |
| 6273 | * Out of memory. |
| 6274 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 6275 | * User-defined callback function failed. |
| 6276 | * NGTCP2_ERR_FLOW_CONTROL |
| 6277 | * Flow control limit is violated; or the final size is beyond the |
| 6278 | * NGTCP2_MAX_VARINT. |
| 6279 | * NGTCP2_ERR_FINAL_SIZE |
| 6280 | * The final offset is strictly larger than it is permitted. |
| 6281 | */ |
| 6282 | static int conn_recv_reset_stream(ngtcp2_conn *conn, |
| 6283 | const ngtcp2_reset_stream *fr) { |
| 6284 | ngtcp2_strm *strm; |
| 6285 | int local_stream = conn_local_stream(conn, fr->stream_id); |
| 6286 | int bidi = bidi_stream(fr->stream_id); |
| 6287 | uint64_t datalen; |
| 6288 | ngtcp2_idtr *idtr; |
| 6289 | int rv; |
| 6290 | |
| 6291 | /* TODO share this piece of code */ |
| 6292 | if (bidi) { |
| 6293 | if (local_stream) { |
| 6294 | if (conn->local.bidi.next_stream_id <= fr->stream_id) { |
| 6295 | return NGTCP2_ERR_STREAM_STATE-226; |
| 6296 | } |
| 6297 | } else if (conn->remote.bidi.max_streams < |
| 6298 | ngtcp2_ord_stream_id(fr->stream_id)) { |
| 6299 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 6300 | } |
| 6301 | |
| 6302 | idtr = &conn->remote.bidi.idtr; |
| 6303 | } else { |
| 6304 | if (local_stream) { |
| 6305 | return NGTCP2_ERR_PROTO-205; |
| 6306 | } |
| 6307 | if (conn->remote.uni.max_streams < ngtcp2_ord_stream_id(fr->stream_id)) { |
| 6308 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 6309 | } |
| 6310 | |
| 6311 | idtr = &conn->remote.uni.idtr; |
| 6312 | } |
| 6313 | |
| 6314 | if (NGTCP2_MAX_VARINT((1ULL << 62) - 1) < fr->final_size) { |
| 6315 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6316 | } |
| 6317 | |
| 6318 | strm = ngtcp2_conn_find_stream(conn, fr->stream_id); |
| 6319 | if (strm == NULL((void*)0)) { |
| 6320 | if (local_stream) { |
| 6321 | return 0; |
| 6322 | } |
| 6323 | |
| 6324 | rv = ngtcp2_idtr_open(idtr, fr->stream_id); |
| 6325 | if (rv != 0) { |
| 6326 | if (ngtcp2_err_is_fatal(rv)) { |
| 6327 | return rv; |
| 6328 | } |
| 6329 | assert(rv == NGTCP2_ERR_STREAM_IN_USE)((void) (0)); |
| 6330 | return 0; |
| 6331 | } |
| 6332 | |
| 6333 | if (conn_initial_stream_rx_offset(conn, fr->stream_id) < fr->final_size || |
| 6334 | conn_max_data_violated(conn, fr->final_size)) { |
| 6335 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6336 | } |
| 6337 | |
| 6338 | /* Stream is reset before we create ngtcp2_strm object. */ |
| 6339 | conn->rx.offset += fr->final_size; |
| 6340 | ngtcp2_conn_extend_max_offset(conn, fr->final_size); |
| 6341 | |
| 6342 | rv = conn_call_stream_reset(conn, fr->stream_id, fr->final_size, |
| 6343 | fr->app_error_code, NULL((void*)0)); |
| 6344 | if (rv != 0) { |
| 6345 | return rv; |
| 6346 | } |
| 6347 | |
| 6348 | /* There will be no activity in this stream because we got |
| 6349 | RESET_STREAM and don't write stream data any further. This |
| 6350 | effectively allows another new stream for peer. */ |
| 6351 | if (bidi) { |
| 6352 | handle_max_remote_streams_extension(&conn->remote.bidi.unsent_max_streams, |
| 6353 | 1); |
| 6354 | } else { |
| 6355 | handle_max_remote_streams_extension(&conn->remote.uni.unsent_max_streams, |
| 6356 | 1); |
| 6357 | } |
| 6358 | |
| 6359 | return 0; |
| 6360 | } |
| 6361 | |
| 6362 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01)) { |
| 6363 | if (strm->rx.last_offset != fr->final_size) { |
| 6364 | return NGTCP2_ERR_FINAL_SIZE-214; |
| 6365 | } |
| 6366 | } else if (strm->rx.last_offset > fr->final_size) { |
| 6367 | return NGTCP2_ERR_FINAL_SIZE-214; |
| 6368 | } |
| 6369 | |
| 6370 | datalen = fr->final_size - strm->rx.last_offset; |
| 6371 | |
| 6372 | if (strm->rx.max_offset < fr->final_size || |
| 6373 | conn_max_data_violated(conn, datalen)) { |
| 6374 | return NGTCP2_ERR_FLOW_CONTROL-211; |
| 6375 | } |
| 6376 | |
| 6377 | if (!(strm->flags & NGTCP2_STRM_FLAG_RECV_RST0x08)) { |
| 6378 | rv = conn_call_stream_reset(conn, fr->stream_id, fr->final_size, |
| 6379 | fr->app_error_code, strm->stream_user_data); |
| 6380 | if (rv != 0) { |
| 6381 | return rv; |
| 6382 | } |
| 6383 | |
| 6384 | /* Extend connection flow control window for the amount of data |
| 6385 | which are not passed to application. */ |
| 6386 | if (!(strm->flags & NGTCP2_STRM_FLAG_STOP_SENDING0x10)) { |
| 6387 | ngtcp2_conn_extend_max_offset(conn, strm->rx.last_offset - |
| 6388 | ngtcp2_strm_rx_offset(strm)); |
| 6389 | } |
| 6390 | } |
| 6391 | |
| 6392 | conn->rx.offset += datalen; |
| 6393 | ngtcp2_conn_extend_max_offset(conn, datalen); |
| 6394 | |
| 6395 | strm->rx.last_offset = fr->final_size; |
| 6396 | strm->flags |= NGTCP2_STRM_FLAG_SHUT_RD0x01 | NGTCP2_STRM_FLAG_RECV_RST0x08; |
| 6397 | |
| 6398 | return ngtcp2_conn_close_stream_if_shut_rdwr(conn, strm, fr->app_error_code); |
| 6399 | } |
| 6400 | |
| 6401 | /* |
| 6402 | * conn_recv_stop_sending is called when STOP_SENDING |fr| is received. |
| 6403 | * |
| 6404 | * This function returns 0 if it succeeds, or one of the following |
| 6405 | * negative error codes: |
| 6406 | * |
| 6407 | * NGTCP2_ERR_STREAM_STATE |
| 6408 | * STOP_SENDING frame is received for a local stream which is not |
| 6409 | * initiated; or STOP_SENDING frame is received for a local |
| 6410 | * unidirectional stream. |
| 6411 | * NGTCP2_ERR_STREAM_LIMIT |
| 6412 | * STOP_SENDING frame has remote stream ID which is strictly |
| 6413 | * greater than the allowed limit. |
| 6414 | * NGTCP2_ERR_NOMEM |
| 6415 | * Out of memory. |
| 6416 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 6417 | * User-defined callback function failed. |
| 6418 | */ |
| 6419 | static int conn_recv_stop_sending(ngtcp2_conn *conn, |
| 6420 | const ngtcp2_stop_sending *fr) { |
| 6421 | int rv; |
| 6422 | ngtcp2_strm *strm; |
| 6423 | ngtcp2_idtr *idtr; |
| 6424 | int local_stream = conn_local_stream(conn, fr->stream_id); |
| 6425 | int bidi = bidi_stream(fr->stream_id); |
| 6426 | |
| 6427 | if (bidi) { |
| 6428 | if (local_stream) { |
| 6429 | if (conn->local.bidi.next_stream_id <= fr->stream_id) { |
| 6430 | return NGTCP2_ERR_STREAM_STATE-226; |
| 6431 | } |
| 6432 | } else if (conn->remote.bidi.max_streams < |
| 6433 | ngtcp2_ord_stream_id(fr->stream_id)) { |
| 6434 | return NGTCP2_ERR_STREAM_LIMIT-213; |
| 6435 | } |
| 6436 | |
| 6437 | idtr = &conn->remote.bidi.idtr; |
| 6438 | } else { |
| 6439 | if (!local_stream || conn->local.uni.next_stream_id <= fr->stream_id) { |
| 6440 | return NGTCP2_ERR_STREAM_STATE-226; |
| 6441 | } |
| 6442 | |
| 6443 | idtr = &conn->remote.uni.idtr; |
| 6444 | } |
| 6445 | |
| 6446 | strm = ngtcp2_conn_find_stream(conn, fr->stream_id); |
| 6447 | if (strm == NULL((void*)0)) { |
| 6448 | if (local_stream) { |
| 6449 | return 0; |
| 6450 | } |
| 6451 | rv = ngtcp2_idtr_open(idtr, fr->stream_id); |
| 6452 | if (rv != 0) { |
| 6453 | if (ngtcp2_err_is_fatal(rv)) { |
| 6454 | return rv; |
| 6455 | } |
| 6456 | assert(rv == NGTCP2_ERR_STREAM_IN_USE)((void) (0)); |
| 6457 | return 0; |
| 6458 | } |
| 6459 | |
| 6460 | /* Frame is received reset before we create ngtcp2_strm |
| 6461 | object. */ |
| 6462 | strm = ngtcp2_mem_malloc(conn->mem, sizeof(ngtcp2_strm)); |
| 6463 | if (strm == NULL((void*)0)) { |
| 6464 | return NGTCP2_ERR_NOMEM-501; |
| 6465 | } |
| 6466 | rv = ngtcp2_conn_init_stream(conn, strm, fr->stream_id, NULL((void*)0)); |
| 6467 | if (rv != 0) { |
| 6468 | ngtcp2_mem_free(conn->mem, strm); |
| 6469 | return rv; |
| 6470 | } |
| 6471 | } |
| 6472 | |
| 6473 | /* No RESET_STREAM is required if we have sent FIN and all data have |
| 6474 | been acknowledged. */ |
| 6475 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_WR0x02) && |
| 6476 | ngtcp2_strm_is_all_tx_data_acked(strm)) { |
| 6477 | return 0; |
| 6478 | } |
| 6479 | |
| 6480 | rv = conn_reset_stream(conn, strm, fr->app_error_code); |
| 6481 | if (rv != 0) { |
| 6482 | return rv; |
| 6483 | } |
| 6484 | |
| 6485 | strm->flags |= NGTCP2_STRM_FLAG_SHUT_WR0x02 | NGTCP2_STRM_FLAG_SENT_RST0x04; |
| 6486 | |
| 6487 | ngtcp2_strm_streamfrq_clear(strm); |
| 6488 | |
| 6489 | return ngtcp2_conn_close_stream_if_shut_rdwr(conn, strm, fr->app_error_code); |
| 6490 | } |
| 6491 | |
| 6492 | /* |
| 6493 | * check_stateless_reset returns nonzero if Stateless Reset |sr| |
| 6494 | * coming via |path| is valid against |dcid|. |
| 6495 | */ |
| 6496 | static int check_stateless_reset(const ngtcp2_dcid *dcid, |
| 6497 | const ngtcp2_path *path, |
| 6498 | const ngtcp2_pkt_stateless_reset *sr) { |
| 6499 | return ngtcp2_path_eq(&dcid->ps.path, path) && |
| 6500 | ngtcp2_verify_stateless_reset_token(dcid->token, |
| 6501 | sr->stateless_reset_token) == 0; |
| 6502 | } |
| 6503 | |
| 6504 | /* |
| 6505 | * conn_on_stateless_reset decodes Stateless Reset from the buffer |
| 6506 | * pointed by |payload| whose length is |payloadlen|. |payload| |
| 6507 | * should start after first byte of packet. |
| 6508 | * |
| 6509 | * If Stateless Reset is decoded, and the Stateless Reset Token is |
| 6510 | * validated, the connection is closed. |
| 6511 | * |
| 6512 | * This function returns 0 if it succeeds, or one of the following |
| 6513 | * negative error codes: |
| 6514 | * |
| 6515 | * NGTCP2_ERR_INVALID_ARGUMENT |
| 6516 | * Could not decode Stateless Reset; or Stateless Reset Token does |
| 6517 | * not match; or No stateless reset token is available. |
| 6518 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 6519 | * User callback failed. |
| 6520 | */ |
| 6521 | static int conn_on_stateless_reset(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 6522 | const uint8_t *payload, size_t payloadlen) { |
| 6523 | int rv = 1; |
| 6524 | ngtcp2_pv *pv = conn->pv; |
| 6525 | ngtcp2_dcid *dcid; |
| 6526 | ngtcp2_pkt_stateless_reset sr; |
| 6527 | size_t len, i; |
| 6528 | |
| 6529 | rv = ngtcp2_pkt_decode_stateless_reset(&sr, payload, payloadlen); |
| 6530 | if (rv != 0) { |
| 6531 | return rv; |
| 6532 | } |
| 6533 | |
| 6534 | if (!check_stateless_reset(&conn->dcid.current, path, &sr) && |
| 6535 | (!pv || (!check_stateless_reset(&pv->dcid, path, &sr) && |
| 6536 | (!(pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) || |
| 6537 | !check_stateless_reset(&pv->fallback_dcid, path, &sr))))) { |
| 6538 | len = ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len); |
| 6539 | for (i = 0; i < len; ++i) { |
| 6540 | dcid = ngtcp2_ringbuf_get(&conn->dcid.retired, i); |
| 6541 | if (check_stateless_reset(dcid, path, &sr)) { |
| 6542 | break; |
| 6543 | } |
| 6544 | } |
| 6545 | |
| 6546 | if (i == len) { |
| 6547 | len = ngtcp2_ringbuf_len(&conn->dcid.bound)((&conn->dcid.bound)->len); |
| 6548 | for (i = 0; i < len; ++i) { |
| 6549 | dcid = ngtcp2_ringbuf_get(&conn->dcid.bound, i); |
| 6550 | if (check_stateless_reset(dcid, path, &sr)) { |
| 6551 | break; |
| 6552 | } |
| 6553 | } |
| 6554 | |
| 6555 | if (i == len) { |
| 6556 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 6557 | } |
| 6558 | } |
| 6559 | } |
| 6560 | |
| 6561 | conn->state = NGTCP2_CS_DRAINING; |
| 6562 | |
| 6563 | ngtcp2_log_rx_sr(&conn->log, &sr); |
| 6564 | |
| 6565 | if (!conn->callbacks.recv_stateless_reset) { |
| 6566 | return 0; |
| 6567 | } |
| 6568 | |
| 6569 | rv = conn->callbacks.recv_stateless_reset(conn, &sr, conn->user_data); |
| 6570 | if (rv != 0) { |
| 6571 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 6572 | } |
| 6573 | |
| 6574 | return 0; |
| 6575 | } |
| 6576 | |
| 6577 | /* |
| 6578 | * conn_recv_max_streams processes the incoming MAX_STREAMS frame |
| 6579 | * |fr|. |
| 6580 | * |
| 6581 | * This function returns 0 if it succeeds, or one of the following |
| 6582 | * negative error codes: |
| 6583 | * |
| 6584 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 6585 | * User callback failed. |
| 6586 | * NGTCP2_ERR_FRAME_ENCODING |
| 6587 | * The maximum streams field exceeds the maximum value. |
| 6588 | */ |
| 6589 | static int conn_recv_max_streams(ngtcp2_conn *conn, |
| 6590 | const ngtcp2_max_streams *fr) { |
| 6591 | uint64_t n; |
| 6592 | |
| 6593 | if (fr->max_streams > NGTCP2_MAX_STREAMS(1LL << 60)) { |
| 6594 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 6595 | } |
| 6596 | |
| 6597 | n = ngtcp2_min(fr->max_streams, NGTCP2_MAX_STREAMS)((fr->max_streams) < ((1LL << 60)) ? (fr->max_streams ) : ((1LL << 60))); |
| 6598 | |
| 6599 | if (fr->type == NGTCP2_FRAME_MAX_STREAMS_BIDI) { |
| 6600 | if (conn->local.bidi.max_streams < n) { |
| 6601 | conn->local.bidi.max_streams = n; |
| 6602 | return conn_call_extend_max_local_streams_bidi(conn, n); |
| 6603 | } |
| 6604 | return 0; |
| 6605 | } |
| 6606 | |
| 6607 | if (conn->local.uni.max_streams < n) { |
| 6608 | conn->local.uni.max_streams = n; |
| 6609 | return conn_call_extend_max_local_streams_uni(conn, n); |
| 6610 | } |
| 6611 | return 0; |
| 6612 | } |
| 6613 | |
| 6614 | static int conn_retire_dcid_prior_to(ngtcp2_conn *conn, ngtcp2_ringbuf *rb, |
| 6615 | uint64_t retire_prior_to) { |
| 6616 | size_t i; |
| 6617 | ngtcp2_dcid *dcid, *last; |
| 6618 | int rv; |
| 6619 | |
| 6620 | for (i = 0; i < ngtcp2_ringbuf_len(rb)((rb)->len);) { |
| 6621 | dcid = ngtcp2_ringbuf_get(rb, i); |
| 6622 | if (dcid->seq >= retire_prior_to) { |
| 6623 | ++i; |
| 6624 | continue; |
| 6625 | } |
| 6626 | |
| 6627 | rv = conn_retire_dcid_seq(conn, dcid->seq); |
| 6628 | if (rv != 0) { |
| 6629 | return rv; |
| 6630 | } |
| 6631 | if (i == 0) { |
| 6632 | ngtcp2_ringbuf_pop_front(rb); |
| 6633 | } else if (i == ngtcp2_ringbuf_len(rb)((rb)->len) - 1) { |
| 6634 | ngtcp2_ringbuf_pop_back(rb); |
| 6635 | break; |
| 6636 | } else { |
| 6637 | last = ngtcp2_ringbuf_get(rb, ngtcp2_ringbuf_len(rb)((rb)->len) - 1); |
| 6638 | ngtcp2_dcid_copy(dcid, last); |
| 6639 | ngtcp2_ringbuf_pop_back(rb); |
| 6640 | } |
| 6641 | } |
| 6642 | |
| 6643 | return 0; |
| 6644 | } |
| 6645 | |
| 6646 | /* |
| 6647 | * conn_recv_new_connection_id processes the incoming |
| 6648 | * NEW_CONNECTION_ID frame |fr|. |
| 6649 | * |
| 6650 | * This function returns 0 if it succeeds, or one of the following |
| 6651 | * negative error codes: |
| 6652 | * |
| 6653 | * NGTCP2_ERR_PROTO |
| 6654 | * |fr| has the duplicated sequence number with different CID or |
| 6655 | * token; or DCID is zero-length. |
| 6656 | */ |
| 6657 | static int conn_recv_new_connection_id(ngtcp2_conn *conn, |
| 6658 | const ngtcp2_new_connection_id *fr) { |
| 6659 | size_t i, len; |
| 6660 | ngtcp2_dcid *dcid; |
| 6661 | ngtcp2_pv *pv = conn->pv; |
| 6662 | int rv; |
| 6663 | int found = 0; |
| 6664 | size_t extra_dcid = 0; |
| 6665 | |
| 6666 | if (conn->dcid.current.cid.datalen == 0) { |
| 6667 | return NGTCP2_ERR_PROTO-205; |
| 6668 | } |
| 6669 | |
| 6670 | if (fr->retire_prior_to > fr->seq) { |
| 6671 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 6672 | } |
| 6673 | |
| 6674 | rv = ngtcp2_dcid_verify_uniqueness(&conn->dcid.current, fr->seq, &fr->cid, |
| 6675 | fr->stateless_reset_token); |
| 6676 | if (rv != 0) { |
| 6677 | return rv; |
| 6678 | } |
| 6679 | if (ngtcp2_cid_eq(&conn->dcid.current.cid, &fr->cid)) { |
| 6680 | found = 1; |
| 6681 | } |
| 6682 | |
| 6683 | if (pv) { |
| 6684 | rv = ngtcp2_dcid_verify_uniqueness(&pv->dcid, fr->seq, &fr->cid, |
| 6685 | fr->stateless_reset_token); |
| 6686 | if (rv != 0) { |
| 6687 | return rv; |
| 6688 | } |
| 6689 | if (ngtcp2_cid_eq(&pv->dcid.cid, &fr->cid)) { |
| 6690 | found = 1; |
| 6691 | } |
| 6692 | } |
| 6693 | |
| 6694 | len = ngtcp2_ringbuf_len(&conn->dcid.bound)((&conn->dcid.bound)->len); |
| 6695 | |
| 6696 | for (i = 0; i < len; ++i) { |
| 6697 | dcid = ngtcp2_ringbuf_get(&conn->dcid.bound, i); |
| 6698 | rv = ngtcp2_dcid_verify_uniqueness(dcid, fr->seq, &fr->cid, |
| 6699 | fr->stateless_reset_token); |
| 6700 | if (rv != 0) { |
| 6701 | return NGTCP2_ERR_PROTO-205; |
| 6702 | } |
| 6703 | if (ngtcp2_cid_eq(&dcid->cid, &fr->cid)) { |
| 6704 | found = 1; |
| 6705 | } |
| 6706 | } |
| 6707 | |
| 6708 | len = ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len); |
| 6709 | |
| 6710 | for (i = 0; i < len; ++i) { |
| 6711 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, i); |
| 6712 | rv = ngtcp2_dcid_verify_uniqueness(dcid, fr->seq, &fr->cid, |
| 6713 | fr->stateless_reset_token); |
| 6714 | if (rv != 0) { |
| 6715 | return NGTCP2_ERR_PROTO-205; |
| 6716 | } |
| 6717 | if (ngtcp2_cid_eq(&dcid->cid, &fr->cid)) { |
| 6718 | found = 1; |
| 6719 | } |
| 6720 | } |
| 6721 | |
| 6722 | if (conn->dcid.retire_prior_to < fr->retire_prior_to) { |
| 6723 | conn->dcid.retire_prior_to = fr->retire_prior_to; |
| 6724 | |
| 6725 | rv = |
| 6726 | conn_retire_dcid_prior_to(conn, &conn->dcid.bound, fr->retire_prior_to); |
| 6727 | if (rv != 0) { |
| 6728 | return rv; |
| 6729 | } |
| 6730 | |
| 6731 | rv = conn_retire_dcid_prior_to(conn, &conn->dcid.unused, |
| 6732 | conn->dcid.retire_prior_to); |
| 6733 | if (rv != 0) { |
| 6734 | return rv; |
| 6735 | } |
| 6736 | } else if (fr->seq < conn->dcid.retire_prior_to) { |
| 6737 | /* If packets are reordered, we might have retire_prior_to which |
| 6738 | is larger than fr->seq. |
| 6739 | |
| 6740 | A malicious peer might send crafted NEW_CONNECTION_ID to force |
| 6741 | local endpoint to create lots of RETIRE_CONNECTION_ID frames. |
| 6742 | For example, a peer might send seq = 50000 and retire_prior_to |
| 6743 | = 50000. Then send NEW_CONNECTION_ID frames with seq < |
| 6744 | 50000. */ |
| 6745 | /* TODO we might queue lots of RETIRE_CONNECTION_ID frame here |
| 6746 | because conn->dcid.num_retire_queued is incremented when the |
| 6747 | frame is serialized. */ |
| 6748 | if (conn->dcid.num_retire_queued < NGTCP2_MAX_DCID_POOL_SIZE8 * 2) { |
| 6749 | return conn_retire_dcid_seq(conn, fr->seq); |
| 6750 | } |
| 6751 | return 0; |
| 6752 | } |
| 6753 | |
| 6754 | if (found) { |
| 6755 | return 0; |
| 6756 | } |
| 6757 | |
| 6758 | if (ngtcp2_gaptr_is_pushed(&conn->dcid.seqgap, fr->seq, 1)) { |
| 6759 | return 0; |
| 6760 | } |
| 6761 | |
| 6762 | rv = ngtcp2_gaptr_push(&conn->dcid.seqgap, fr->seq, 1); |
| 6763 | if (rv != 0) { |
| 6764 | return rv; |
| 6765 | } |
| 6766 | |
| 6767 | if (ngtcp2_ksl_len(&conn->dcid.seqgap.gap) > 32) { |
| 6768 | ngtcp2_gaptr_drop_first_gap(&conn->dcid.seqgap); |
| 6769 | } |
| 6770 | |
| 6771 | len = ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len); |
| 6772 | |
| 6773 | if (conn->dcid.current.seq >= conn->dcid.retire_prior_to) { |
| 6774 | ++extra_dcid; |
| 6775 | } |
| 6776 | if (pv) { |
| 6777 | if (pv->dcid.seq != conn->dcid.current.seq && |
| 6778 | pv->dcid.seq >= conn->dcid.retire_prior_to) { |
| 6779 | ++extra_dcid; |
| 6780 | } |
| 6781 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 6782 | pv->fallback_dcid.seq != conn->dcid.current.seq && |
| 6783 | pv->fallback_dcid.seq >= conn->dcid.retire_prior_to) { |
| 6784 | ++extra_dcid; |
| 6785 | } |
| 6786 | } |
| 6787 | |
| 6788 | if (conn->local.transport_params.active_connection_id_limit <= |
| 6789 | len + extra_dcid) { |
| 6790 | return NGTCP2_ERR_CONNECTION_ID_LIMIT-212; |
| 6791 | } |
| 6792 | |
| 6793 | if (len >= NGTCP2_MAX_DCID_POOL_SIZE8) { |
| 6794 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, "too many connection ID"); |
| 6795 | return 0; |
| 6796 | } |
| 6797 | |
| 6798 | dcid = ngtcp2_ringbuf_push_back(&conn->dcid.unused); |
| 6799 | ngtcp2_dcid_init(dcid, fr->seq, &fr->cid, fr->stateless_reset_token); |
| 6800 | |
| 6801 | return 0; |
| 6802 | } |
| 6803 | |
| 6804 | /* |
| 6805 | * conn_post_process_recv_new_connection_id handles retirement request |
| 6806 | * of active DCIDs. |
| 6807 | * |
| 6808 | * This function returns 0 if it succeeds, or one of the following |
| 6809 | * negative error codes: |
| 6810 | * |
| 6811 | * NGTCP2_ERR_NOMEM |
| 6812 | * Out of memory. |
| 6813 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 6814 | * User-defined callback function failed. |
| 6815 | */ |
| 6816 | static int conn_post_process_recv_new_connection_id(ngtcp2_conn *conn, |
| 6817 | ngtcp2_tstamp ts) { |
| 6818 | ngtcp2_pv *pv = conn->pv; |
| 6819 | ngtcp2_dcid *dcid; |
| 6820 | int rv; |
| 6821 | |
| 6822 | if (conn->dcid.current.seq < conn->dcid.retire_prior_to) { |
| 6823 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len) == 0) { |
| 6824 | return 0; |
| 6825 | } |
| 6826 | |
| 6827 | rv = conn_retire_dcid(conn, &conn->dcid.current, ts); |
| 6828 | if (rv != 0) { |
| 6829 | return rv; |
| 6830 | } |
| 6831 | |
| 6832 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 6833 | if (pv) { |
| 6834 | if (conn->dcid.current.seq == pv->dcid.seq) { |
| 6835 | ngtcp2_dcid_copy_cid_token(&pv->dcid, dcid); |
| 6836 | } |
| 6837 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 6838 | conn->dcid.current.seq == pv->fallback_dcid.seq) { |
| 6839 | ngtcp2_dcid_copy_cid_token(&pv->fallback_dcid, dcid); |
| 6840 | } |
| 6841 | } |
| 6842 | |
| 6843 | ngtcp2_dcid_copy_cid_token(&conn->dcid.current, dcid); |
| 6844 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 6845 | |
| 6846 | rv = conn_call_activate_dcid(conn, &conn->dcid.current); |
| 6847 | if (rv != 0) { |
| 6848 | return rv; |
| 6849 | } |
| 6850 | } |
| 6851 | |
| 6852 | if (pv) { |
| 6853 | if (pv->dcid.seq < conn->dcid.retire_prior_to) { |
| 6854 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len)) { |
| 6855 | rv = conn_retire_dcid(conn, &pv->dcid, ts); |
| 6856 | if (rv != 0) { |
| 6857 | return rv; |
| 6858 | } |
| 6859 | |
| 6860 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 6861 | |
| 6862 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 6863 | pv->dcid.seq == pv->fallback_dcid.seq) { |
| 6864 | ngtcp2_dcid_copy_cid_token(&pv->fallback_dcid, dcid); |
| 6865 | } |
| 6866 | |
| 6867 | ngtcp2_dcid_copy_cid_token(&pv->dcid, dcid); |
| 6868 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 6869 | |
| 6870 | rv = conn_call_activate_dcid(conn, &pv->dcid); |
| 6871 | if (rv != 0) { |
| 6872 | return rv; |
| 6873 | } |
| 6874 | } else { |
| 6875 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PTV, |
| 6876 | "path migration is aborted because connection ID is" |
| 6877 | "retired and no unused connection ID is available"); |
| 6878 | |
| 6879 | return conn_stop_pv(conn, ts); |
| 6880 | } |
| 6881 | } |
| 6882 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 6883 | pv->fallback_dcid.seq < conn->dcid.retire_prior_to) { |
| 6884 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len)) { |
| 6885 | rv = conn_retire_dcid(conn, &pv->fallback_dcid, ts); |
| 6886 | if (rv != 0) { |
| 6887 | return rv; |
| 6888 | } |
| 6889 | |
| 6890 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 6891 | ngtcp2_dcid_copy_cid_token(&pv->fallback_dcid, dcid); |
| 6892 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 6893 | |
| 6894 | rv = conn_call_activate_dcid(conn, &pv->fallback_dcid); |
| 6895 | if (rv != 0) { |
| 6896 | return rv; |
| 6897 | } |
| 6898 | } else { |
| 6899 | /* Now we have no fallback dcid. */ |
| 6900 | return conn_stop_pv(conn, ts); |
| 6901 | } |
| 6902 | } |
| 6903 | } |
| 6904 | |
| 6905 | return 0; |
| 6906 | } |
| 6907 | |
| 6908 | /* |
| 6909 | * conn_recv_retire_connection_id processes the incoming |
| 6910 | * RETIRE_CONNECTION_ID frame |fr|. |hd| is a packet header which |
| 6911 | * |fr| is included. |
| 6912 | * |
| 6913 | * This function returns 0 if it succeeds, or one of the following |
| 6914 | * negative error codes: |
| 6915 | * |
| 6916 | * NGTCP2_ERR_NOMEM |
| 6917 | * Out of memory. |
| 6918 | * NGTCP2_ERR_PROTO |
| 6919 | * SCID is zero-length. |
| 6920 | * NGTCP2_ERR_FRAME_ENCODING |
| 6921 | * Attempt to retire CID which is used as DCID to send this frame. |
| 6922 | */ |
| 6923 | static int conn_recv_retire_connection_id(ngtcp2_conn *conn, |
| 6924 | const ngtcp2_pkt_hd *hd, |
| 6925 | const ngtcp2_retire_connection_id *fr, |
| 6926 | ngtcp2_tstamp ts) { |
| 6927 | ngtcp2_ksl_it it; |
| 6928 | ngtcp2_scid *scid; |
| 6929 | |
| 6930 | if (conn->oscid.datalen == 0 || conn->scid.last_seq < fr->seq) { |
| 6931 | return NGTCP2_ERR_PROTO-205; |
| 6932 | } |
| 6933 | |
| 6934 | for (it = ngtcp2_ksl_begin(&conn->scid.set); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 6935 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 6936 | scid = ngtcp2_ksl_it_get(&it); |
| 6937 | if (scid->seq == fr->seq) { |
| 6938 | if (ngtcp2_cid_eq(&scid->cid, &hd->dcid)) { |
| 6939 | return NGTCP2_ERR_PROTO-205; |
| 6940 | } |
| 6941 | |
| 6942 | if (!(scid->flags & NGTCP2_SCID_FLAG_RETIRED0x02)) { |
| 6943 | scid->flags |= NGTCP2_SCID_FLAG_RETIRED0x02; |
| 6944 | ++conn->scid.num_retired; |
| 6945 | } |
| 6946 | |
| 6947 | if (scid->pe.index != NGTCP2_PQ_BAD_INDEX(18446744073709551615UL)) { |
| 6948 | ngtcp2_pq_remove(&conn->scid.used, &scid->pe); |
| 6949 | scid->pe.index = NGTCP2_PQ_BAD_INDEX(18446744073709551615UL); |
| 6950 | } |
| 6951 | |
| 6952 | scid->ts_retired = ts; |
| 6953 | |
| 6954 | return ngtcp2_pq_push(&conn->scid.used, &scid->pe); |
| 6955 | } |
| 6956 | } |
| 6957 | |
| 6958 | return 0; |
| 6959 | } |
| 6960 | |
| 6961 | /* |
| 6962 | * conn_recv_new_token processes the incoming NEW_TOKEN frame |fr|. |
| 6963 | * |
| 6964 | * This function returns 0 if it succeeds, or one of the following |
| 6965 | * negative error codes: |
| 6966 | * |
| 6967 | * NGTCP2_ERR_FRAME_ENCODING |
| 6968 | * Token is empty |
| 6969 | * NGTCP2_ERR_PROTO: |
| 6970 | * Server received NEW_TOKEN. |
| 6971 | */ |
| 6972 | static int conn_recv_new_token(ngtcp2_conn *conn, const ngtcp2_new_token *fr) { |
| 6973 | int rv; |
| 6974 | |
| 6975 | if (conn->server) { |
| 6976 | return NGTCP2_ERR_PROTO-205; |
| 6977 | } |
| 6978 | |
| 6979 | if (fr->token.len == 0) { |
| 6980 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 6981 | } |
| 6982 | |
| 6983 | if (conn->callbacks.recv_new_token) { |
| 6984 | rv = conn->callbacks.recv_new_token(conn, &fr->token, conn->user_data); |
| 6985 | if (rv != 0) { |
| 6986 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 6987 | } |
| 6988 | } |
| 6989 | |
| 6990 | return 0; |
| 6991 | } |
| 6992 | |
| 6993 | /* |
| 6994 | * conn_recv_streams_blocked_bidi processes the incoming |
| 6995 | * STREAMS_BLOCKED (0x16). |
| 6996 | * |
| 6997 | * This function returns 0 if it succeeds, or one of the following |
| 6998 | * negative error codes: |
| 6999 | * |
| 7000 | * NGTCP2_ERR_FRAME_ENCODING |
| 7001 | * Maximum Streams is larger than advertised value. |
| 7002 | */ |
| 7003 | static int conn_recv_streams_blocked_bidi(ngtcp2_conn *conn, |
| 7004 | ngtcp2_streams_blocked *fr) { |
| 7005 | if (fr->max_streams > conn->remote.bidi.max_streams) { |
| 7006 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 7007 | } |
| 7008 | |
| 7009 | return 0; |
| 7010 | } |
| 7011 | |
| 7012 | /* |
| 7013 | * conn_recv_streams_blocked_uni processes the incoming |
| 7014 | * STREAMS_BLOCKED (0x17). |
| 7015 | * |
| 7016 | * This function returns 0 if it succeeds, or one of the following |
| 7017 | * negative error codes: |
| 7018 | * |
| 7019 | * NGTCP2_ERR_FRAME_ENCODING |
| 7020 | * Maximum Streams is larger than advertised value. |
| 7021 | */ |
| 7022 | static int conn_recv_streams_blocked_uni(ngtcp2_conn *conn, |
| 7023 | ngtcp2_streams_blocked *fr) { |
| 7024 | if (fr->max_streams > conn->remote.uni.max_streams) { |
| 7025 | return NGTCP2_ERR_FRAME_ENCODING-219; |
| 7026 | } |
| 7027 | |
| 7028 | return 0; |
| 7029 | } |
| 7030 | |
| 7031 | /* |
| 7032 | * conn_select_preferred_addr asks a client application to select a |
| 7033 | * server address from preferred addresses received from server. If a |
| 7034 | * client chooses the address, path validation will start. |
| 7035 | * |
| 7036 | * This function returns 0 if it succeeds, or one of the following |
| 7037 | * negative error codes: |
| 7038 | * |
| 7039 | * NGTCP2_ERR_NOMEM |
| 7040 | * Out of memory. |
| 7041 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 7042 | * User-defined callback function failed. |
| 7043 | */ |
| 7044 | static int conn_select_preferred_addr(ngtcp2_conn *conn) { |
| 7045 | struct sockaddr_storage buf; |
| 7046 | ngtcp2_addr addr; |
| 7047 | int rv; |
| 7048 | ngtcp2_duration pto, initial_pto, timeout; |
| 7049 | ngtcp2_pv *pv; |
| 7050 | ngtcp2_dcid *dcid; |
| 7051 | |
| 7052 | ngtcp2_addr_init(&addr, (struct sockaddr *)&buf, 0, NULL((void*)0)); |
| 7053 | |
| 7054 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len) == 0) { |
| 7055 | return 0; |
| 7056 | } |
| 7057 | |
| 7058 | rv = conn_call_select_preferred_addr(conn, &addr); |
| 7059 | if (rv != 0) { |
| 7060 | return rv; |
| 7061 | } |
| 7062 | |
| 7063 | if (addr.addrlen == 0 || |
| 7064 | ngtcp2_addr_eq(&conn->dcid.current.ps.path.remote, &addr)) { |
| 7065 | return 0; |
| 7066 | } |
| 7067 | |
| 7068 | assert(conn->pv == NULL)((void) (0)); |
| 7069 | |
| 7070 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 7071 | pto = conn_compute_pto(conn, &conn->pktns); |
| 7072 | initial_pto = conn_compute_initial_pto(conn, &conn->pktns); |
| 7073 | timeout = 3 * ngtcp2_max(pto, initial_pto)((pto) > (initial_pto) ? (pto) : (initial_pto)); |
| 7074 | |
| 7075 | rv = ngtcp2_pv_new(&pv, dcid, timeout, NGTCP2_PV_FLAG_NONE0x00, &conn->log, |
| 7076 | conn->mem); |
| 7077 | if (rv != 0) { |
| 7078 | /* TODO Call ngtcp2_dcid_free here if it is introduced */ |
| 7079 | return rv; |
| 7080 | } |
| 7081 | |
| 7082 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 7083 | conn->pv = pv; |
| 7084 | |
| 7085 | ngtcp2_addr_copy(&pv->dcid.ps.path.local, &conn->dcid.current.ps.path.local); |
| 7086 | ngtcp2_addr_copy(&pv->dcid.ps.path.remote, &addr); |
| 7087 | |
| 7088 | return conn_call_activate_dcid(conn, &pv->dcid); |
| 7089 | } |
| 7090 | |
| 7091 | /* |
| 7092 | * conn_recv_handshake_done processes the incoming HANDSHAKE_DONE |
| 7093 | * frame |fr|. |
| 7094 | * |
| 7095 | * This function returns 0 if it succeeds, or one of the following |
| 7096 | * negative error codes: |
| 7097 | * |
| 7098 | * NGTCP2_ERR_PROTO |
| 7099 | * Server received HANDSHAKE_DONE frame. |
| 7100 | * NGTCP2_ERR_NOMEM |
| 7101 | * Out of memory. |
| 7102 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 7103 | * User-defined callback function failed. |
| 7104 | */ |
| 7105 | static int conn_recv_handshake_done(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 7106 | int rv; |
| 7107 | |
| 7108 | if (conn->server) { |
| 7109 | return NGTCP2_ERR_PROTO-205; |
| 7110 | } |
| 7111 | |
| 7112 | if (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80) { |
| 7113 | return 0; |
| 7114 | } |
| 7115 | |
| 7116 | conn->flags |= NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80 | |
| 7117 | NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000; |
| 7118 | |
| 7119 | conn->pktns.rtb.persistent_congestion_start_ts = ts; |
| 7120 | |
| 7121 | conn_discard_handshake_state(conn, ts); |
| 7122 | |
| 7123 | if (conn->remote.transport_params.preferred_address_present) { |
| 7124 | rv = conn_select_preferred_addr(conn); |
| 7125 | if (rv != 0) { |
| 7126 | return rv; |
| 7127 | } |
| 7128 | } |
| 7129 | |
| 7130 | if (conn->callbacks.handshake_confirmed) { |
| 7131 | rv = conn->callbacks.handshake_confirmed(conn, conn->user_data); |
| 7132 | if (rv != 0) { |
| 7133 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 7134 | } |
| 7135 | } |
| 7136 | |
| 7137 | /* Re-arm loss detection timer after handshake has been |
| 7138 | confirmed. */ |
| 7139 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 7140 | |
| 7141 | return 0; |
| 7142 | } |
| 7143 | |
| 7144 | /* |
| 7145 | * conn_recv_datagram processes the incoming DATAGRAM frame |fr|. |
| 7146 | * |
| 7147 | * This function returns 0 if it succeeds, or one of the following |
| 7148 | * negative error codes: |
| 7149 | * |
| 7150 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 7151 | * User-defined callback function failed. |
| 7152 | */ |
| 7153 | static int conn_recv_datagram(ngtcp2_conn *conn, ngtcp2_datagram *fr) { |
| 7154 | const uint8_t *data; |
| 7155 | size_t datalen; |
| 7156 | int rv; |
| 7157 | uint32_t flags = NGTCP2_DATAGRAM_FLAG_NONE0x00; |
| 7158 | |
| 7159 | assert(conn->local.transport_params.max_datagram_frame_size)((void) (0)); |
| 7160 | |
| 7161 | if (!conn->callbacks.recv_datagram) { |
| 7162 | return 0; |
| 7163 | } |
| 7164 | |
| 7165 | if (fr->datacnt) { |
| 7166 | assert(fr->datacnt == 1)((void) (0)); |
| 7167 | |
| 7168 | data = fr->data->base; |
| 7169 | datalen = fr->data->len; |
| 7170 | } else { |
| 7171 | data = NULL((void*)0); |
| 7172 | datalen = 0; |
| 7173 | } |
| 7174 | |
| 7175 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 7176 | flags |= NGTCP2_DATAGRAM_FLAG_EARLY0x01; |
| 7177 | } |
| 7178 | |
| 7179 | rv = conn->callbacks.recv_datagram(conn, flags, data, datalen, |
| 7180 | conn->user_data); |
| 7181 | if (rv != 0) { |
| 7182 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 7183 | } |
| 7184 | |
| 7185 | return 0; |
| 7186 | } |
| 7187 | |
| 7188 | /* |
| 7189 | * conn_key_phase_changed returns nonzero if |hd| indicates that the |
| 7190 | * key phase has unexpected value. |
| 7191 | */ |
| 7192 | static int conn_key_phase_changed(ngtcp2_conn *conn, const ngtcp2_pkt_hd *hd) { |
| 7193 | ngtcp2_pktns *pktns = &conn->pktns; |
| 7194 | |
| 7195 | return !(pktns->crypto.rx.ckm->flags & NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01) ^ |
| 7196 | !(hd->flags & NGTCP2_PKT_FLAG_KEY_PHASE0x04); |
| 7197 | } |
| 7198 | |
| 7199 | /* |
| 7200 | * conn_prepare_key_update installs new updated keys. |
| 7201 | */ |
| 7202 | static int conn_prepare_key_update(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 7203 | int rv; |
| 7204 | ngtcp2_tstamp confirmed_ts = conn->crypto.key_update.confirmed_ts; |
| 7205 | ngtcp2_duration pto = conn_compute_pto(conn, &conn->pktns); |
| 7206 | ngtcp2_pktns *pktns = &conn->pktns; |
| 7207 | ngtcp2_crypto_km *rx_ckm = pktns->crypto.rx.ckm; |
| 7208 | ngtcp2_crypto_km *tx_ckm = pktns->crypto.tx.ckm; |
| 7209 | ngtcp2_crypto_km *new_rx_ckm, *new_tx_ckm; |
| 7210 | ngtcp2_crypto_aead_ctx rx_aead_ctx = {0}, tx_aead_ctx = {0}; |
| 7211 | size_t secretlen, ivlen; |
| 7212 | |
| 7213 | if ((conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80) && |
| 7214 | tx_ckm->use_count >= pktns->crypto.ctx.max_encryption && |
| 7215 | ngtcp2_conn_initiate_key_update(conn, ts) != 0) { |
| 7216 | return NGTCP2_ERR_AEAD_LIMIT_REACHED-243; |
| 7217 | } |
| 7218 | |
| 7219 | if ((conn->flags & NGTCP2_CONN_FLAG_KEY_UPDATE_NOT_CONFIRMED0x0800) || |
| 7220 | (confirmed_ts != UINT64_MAX(18446744073709551615UL) && confirmed_ts + pto > ts)) { |
| 7221 | return 0; |
| 7222 | } |
| 7223 | |
| 7224 | if (conn->crypto.key_update.new_rx_ckm || |
| 7225 | conn->crypto.key_update.new_tx_ckm) { |
| 7226 | assert(conn->crypto.key_update.new_rx_ckm)((void) (0)); |
| 7227 | assert(conn->crypto.key_update.new_tx_ckm)((void) (0)); |
| 7228 | return 0; |
| 7229 | } |
| 7230 | |
| 7231 | secretlen = rx_ckm->secret.len; |
| 7232 | ivlen = rx_ckm->iv.len; |
| 7233 | |
| 7234 | rv = ngtcp2_crypto_km_nocopy_new(&conn->crypto.key_update.new_rx_ckm, |
| 7235 | secretlen, ivlen, conn->mem); |
| 7236 | if (rv != 0) { |
| 7237 | return rv; |
| 7238 | } |
| 7239 | |
| 7240 | rv = ngtcp2_crypto_km_nocopy_new(&conn->crypto.key_update.new_tx_ckm, |
| 7241 | secretlen, ivlen, conn->mem); |
| 7242 | if (rv != 0) { |
| 7243 | return rv; |
| 7244 | } |
| 7245 | |
| 7246 | new_rx_ckm = conn->crypto.key_update.new_rx_ckm; |
| 7247 | new_tx_ckm = conn->crypto.key_update.new_tx_ckm; |
| 7248 | |
| 7249 | assert(conn->callbacks.update_key)((void) (0)); |
| 7250 | |
| 7251 | rv = conn->callbacks.update_key( |
| 7252 | conn, new_rx_ckm->secret.base, new_tx_ckm->secret.base, &rx_aead_ctx, |
| 7253 | new_rx_ckm->iv.base, &tx_aead_ctx, new_tx_ckm->iv.base, |
| 7254 | rx_ckm->secret.base, tx_ckm->secret.base, secretlen, conn->user_data); |
| 7255 | if (rv != 0) { |
| 7256 | return NGTCP2_ERR_CALLBACK_FAILURE-502; |
| 7257 | } |
| 7258 | |
| 7259 | new_rx_ckm->aead_ctx = rx_aead_ctx; |
| 7260 | new_tx_ckm->aead_ctx = tx_aead_ctx; |
| 7261 | |
| 7262 | if (!(rx_ckm->flags & NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01)) { |
| 7263 | new_rx_ckm->flags |= NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01; |
| 7264 | new_tx_ckm->flags |= NGTCP2_CRYPTO_KM_FLAG_KEY_PHASE_ONE0x01; |
| 7265 | } |
| 7266 | |
| 7267 | if (conn->crypto.key_update.old_rx_ckm) { |
| 7268 | conn_call_delete_crypto_aead_ctx( |
| 7269 | conn, &conn->crypto.key_update.old_rx_ckm->aead_ctx); |
| 7270 | ngtcp2_crypto_km_del(conn->crypto.key_update.old_rx_ckm, conn->mem); |
| 7271 | conn->crypto.key_update.old_rx_ckm = NULL((void*)0); |
| 7272 | } |
| 7273 | |
| 7274 | return 0; |
| 7275 | } |
| 7276 | |
| 7277 | /* |
| 7278 | * conn_rotate_keys rotates keys. The current key moves to old key, |
| 7279 | * and new key moves to the current key. |
| 7280 | */ |
| 7281 | static void conn_rotate_keys(ngtcp2_conn *conn, int64_t pkt_num) { |
| 7282 | ngtcp2_pktns *pktns = &conn->pktns; |
| 7283 | |
| 7284 | assert(conn->crypto.key_update.new_rx_ckm)((void) (0)); |
| 7285 | assert(conn->crypto.key_update.new_tx_ckm)((void) (0)); |
| 7286 | assert(!conn->crypto.key_update.old_rx_ckm)((void) (0)); |
| 7287 | assert(!(conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING))((void) (0)); |
| 7288 | |
| 7289 | conn->crypto.key_update.old_rx_ckm = pktns->crypto.rx.ckm; |
| 7290 | |
| 7291 | pktns->crypto.rx.ckm = conn->crypto.key_update.new_rx_ckm; |
| 7292 | conn->crypto.key_update.new_rx_ckm = NULL((void*)0); |
| 7293 | pktns->crypto.rx.ckm->pkt_num = pkt_num; |
| 7294 | |
| 7295 | assert(pktns->crypto.tx.ckm)((void) (0)); |
| 7296 | |
| 7297 | conn_call_delete_crypto_aead_ctx(conn, &pktns->crypto.tx.ckm->aead_ctx); |
| 7298 | ngtcp2_crypto_km_del(pktns->crypto.tx.ckm, conn->mem); |
| 7299 | |
| 7300 | pktns->crypto.tx.ckm = conn->crypto.key_update.new_tx_ckm; |
| 7301 | conn->crypto.key_update.new_tx_ckm = NULL((void*)0); |
| 7302 | pktns->crypto.tx.ckm->pkt_num = pktns->tx.last_pkt_num + 1; |
| 7303 | |
| 7304 | conn->flags |= NGTCP2_CONN_FLAG_KEY_UPDATE_NOT_CONFIRMED0x0800; |
| 7305 | } |
| 7306 | |
| 7307 | /* |
| 7308 | * conn_path_validation_in_progress returns nonzero if path validation |
| 7309 | * against |path| is underway. |
| 7310 | */ |
| 7311 | static int conn_path_validation_in_progress(ngtcp2_conn *conn, |
| 7312 | const ngtcp2_path *path) { |
| 7313 | ngtcp2_pv *pv = conn->pv; |
| 7314 | |
| 7315 | return pv && ngtcp2_path_eq(&pv->dcid.ps.path, path); |
| 7316 | } |
| 7317 | |
| 7318 | /* |
| 7319 | * conn_recv_non_probing_pkt_on_new_path is called when non-probing |
| 7320 | * packet is received via new path. It starts path validation against |
| 7321 | * the new path. |
| 7322 | * |
| 7323 | * This function returns 0 if it succeeds, or one of the following |
| 7324 | * negative error codes: |
| 7325 | * |
| 7326 | * NGTCP2_ERR_CONN_ID_BLOCKED |
| 7327 | * No DCID is available |
| 7328 | * NGTCP2_ERR_NOMEM |
| 7329 | * Out of memory |
| 7330 | */ |
| 7331 | static int conn_recv_non_probing_pkt_on_new_path(ngtcp2_conn *conn, |
| 7332 | const ngtcp2_path *path, |
| 7333 | size_t dgramlen, |
| 7334 | int new_cid_used, |
| 7335 | ngtcp2_tstamp ts) { |
| 7336 | |
| 7337 | ngtcp2_dcid dcid, *bound_dcid, *last; |
| 7338 | ngtcp2_pv *pv; |
| 7339 | int rv; |
| 7340 | ngtcp2_duration pto, initial_pto, timeout; |
| 7341 | int require_new_cid; |
| 7342 | int local_addr_eq; |
| 7343 | uint32_t remote_addr_cmp; |
| 7344 | size_t len, i; |
| 7345 | |
| 7346 | assert(conn->server)((void) (0)); |
| 7347 | |
| 7348 | if (conn->pv && (conn->pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 7349 | ngtcp2_path_eq(&conn->pv->fallback_dcid.ps.path, path)) { |
| 7350 | /* If new path equals fallback path, that means connection |
| 7351 | migrated back to the original path. Fallback path is |
| 7352 | considered to be validated. */ |
| 7353 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PTV, |
| 7354 | "path is migrated back to the original path"); |
| 7355 | ngtcp2_dcid_copy(&conn->dcid.current, &conn->pv->fallback_dcid); |
| 7356 | conn_reset_congestion_state(conn); |
| 7357 | conn->dcid.current.bytes_recv += dgramlen; |
| 7358 | conn_reset_ecn_validation_state(conn); |
| 7359 | rv = conn_stop_pv(conn, ts); |
| 7360 | if (rv != 0) { |
| 7361 | return rv; |
| 7362 | } |
| 7363 | return 0; |
| 7364 | } |
| 7365 | |
| 7366 | remote_addr_cmp = |
| 7367 | ngtcp2_addr_compare(&conn->dcid.current.ps.path.remote, &path->remote); |
| 7368 | local_addr_eq = |
| 7369 | ngtcp2_addr_eq(&conn->dcid.current.ps.path.local, &path->local); |
| 7370 | |
| 7371 | /* The transport specification draft-27 says: |
| 7372 | * |
| 7373 | * An endpoint MUST use a new connection ID if it initiates |
| 7374 | * connection migration as described in Section 9.2 or probes a new |
| 7375 | * network path as described in Section 9.1. An endpoint MUST use a |
| 7376 | * new connection ID in response to a change in the address of a |
| 7377 | * peer if the packet with the new peer address uses an active |
| 7378 | * connection ID that has not been previously used by the peer. |
| 7379 | */ |
| 7380 | require_new_cid = conn->dcid.current.cid.datalen && |
| 7381 | ((new_cid_used && remote_addr_cmp) || !local_addr_eq); |
| 7382 | |
| 7383 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 7384 | "non-probing packet was received from new remote address"); |
| 7385 | |
| 7386 | pto = conn_compute_pto(conn, &conn->pktns); |
| 7387 | initial_pto = conn_compute_initial_pto(conn, &conn->pktns); |
| 7388 | timeout = 3 * ngtcp2_max(pto, initial_pto)((pto) > (initial_pto) ? (pto) : (initial_pto)); |
| 7389 | |
| 7390 | len = ngtcp2_ringbuf_len(&conn->dcid.bound)((&conn->dcid.bound)->len); |
| 7391 | |
| 7392 | for (i = 0; i < len; ++i) { |
| 7393 | bound_dcid = ngtcp2_ringbuf_get(&conn->dcid.bound, i); |
| 7394 | if (ngtcp2_path_eq(&bound_dcid->ps.path, path)) { |
| 7395 | ngtcp2_log_info( |
| 7396 | &conn->log, NGTCP2_LOG_EVENT_CON, |
| 7397 | "Found DCID which has already been bound to the new path"); |
| 7398 | |
| 7399 | ngtcp2_dcid_copy(&dcid, bound_dcid); |
| 7400 | if (i == 0) { |
| 7401 | ngtcp2_ringbuf_pop_front(&conn->dcid.bound); |
| 7402 | } else if (i == ngtcp2_ringbuf_len(&conn->dcid.bound)((&conn->dcid.bound)->len) - 1) { |
| 7403 | ngtcp2_ringbuf_pop_back(&conn->dcid.bound); |
| 7404 | } else { |
| 7405 | last = ngtcp2_ringbuf_get(&conn->dcid.bound, len - 1); |
| 7406 | ngtcp2_dcid_copy(bound_dcid, last); |
| 7407 | ngtcp2_ringbuf_pop_back(&conn->dcid.bound); |
| 7408 | } |
| 7409 | require_new_cid = 0; |
| 7410 | |
| 7411 | if (dcid.cid.datalen) { |
| 7412 | rv = conn_call_activate_dcid(conn, &dcid); |
| 7413 | if (rv != 0) { |
| 7414 | return rv; |
| 7415 | } |
| 7416 | } |
| 7417 | break; |
| 7418 | } |
| 7419 | } |
| 7420 | |
| 7421 | if (i == len) { |
| 7422 | if (require_new_cid) { |
| 7423 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len) == 0) { |
| 7424 | return NGTCP2_ERR_CONN_ID_BLOCKED-237; |
| 7425 | } |
| 7426 | ngtcp2_dcid_copy(&dcid, ngtcp2_ringbuf_get(&conn->dcid.unused, 0)); |
| 7427 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 7428 | |
| 7429 | rv = conn_call_activate_dcid(conn, &dcid); |
| 7430 | if (rv != 0) { |
| 7431 | return rv; |
| 7432 | } |
| 7433 | } else { |
| 7434 | /* Use the current DCID if a remote endpoint does not change |
| 7435 | DCID. */ |
| 7436 | ngtcp2_dcid_copy(&dcid, &conn->dcid.current); |
| 7437 | dcid.bytes_sent = 0; |
| 7438 | dcid.bytes_recv = 0; |
| 7439 | dcid.flags &= (uint8_t)~NGTCP2_DCID_FLAG_PATH_VALIDATED0x01; |
| 7440 | } |
| 7441 | } |
| 7442 | |
| 7443 | ngtcp2_path_copy(&dcid.ps.path, path); |
| 7444 | dcid.bytes_recv += dgramlen; |
| 7445 | |
| 7446 | rv = ngtcp2_pv_new(&pv, &dcid, timeout, NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04, |
| 7447 | &conn->log, conn->mem); |
| 7448 | if (rv != 0) { |
| 7449 | return rv; |
| 7450 | } |
| 7451 | |
| 7452 | if (conn->pv && (conn->pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04)) { |
| 7453 | ngtcp2_dcid_copy(&pv->fallback_dcid, &conn->pv->fallback_dcid); |
| 7454 | pv->fallback_pto = conn->pv->fallback_pto; |
| 7455 | } else { |
| 7456 | ngtcp2_dcid_copy(&pv->fallback_dcid, &conn->dcid.current); |
| 7457 | pv->fallback_pto = pto; |
| 7458 | } |
| 7459 | |
| 7460 | ngtcp2_dcid_copy(&conn->dcid.current, &dcid); |
| 7461 | |
| 7462 | if (!local_addr_eq || (remote_addr_cmp & (NGTCP2_ADDR_COMPARE_FLAG_ADDR0x1 | |
| 7463 | NGTCP2_ADDR_COMPARE_FLAG_FAMILY0x4))) { |
| 7464 | conn_reset_congestion_state(conn); |
| 7465 | } |
| 7466 | conn_reset_ecn_validation_state(conn); |
| 7467 | |
| 7468 | if (conn->pv) { |
| 7469 | ngtcp2_log_info( |
| 7470 | &conn->log, NGTCP2_LOG_EVENT_PTV, |
| 7471 | "path migration is aborted because new migration has started"); |
| 7472 | rv = conn_stop_pv(conn, ts); |
| 7473 | if (rv != 0) { |
| 7474 | return rv; |
| 7475 | } |
| 7476 | } |
| 7477 | |
| 7478 | conn->pv = pv; |
| 7479 | |
| 7480 | return 0; |
| 7481 | } |
| 7482 | |
| 7483 | /* |
| 7484 | * conn_recv_pkt_from_new_path is called when a Short packet is |
| 7485 | * received from new path (not current path). This packet would be a |
| 7486 | * packet which only contains probing frame, or reordered packet, or a |
| 7487 | * path is being validated. |
| 7488 | * |
| 7489 | * This function returns 0 if it succeeds, or one of the following |
| 7490 | * negative error codes: |
| 7491 | * |
| 7492 | * NGTCP2_ERR_CONN_ID_BLOCKED |
| 7493 | * No unused DCID is available |
| 7494 | * NGTCP2_ERR_NOMEM |
| 7495 | * Out of memory |
| 7496 | */ |
| 7497 | static int conn_recv_pkt_from_new_path(ngtcp2_conn *conn, |
| 7498 | const ngtcp2_path *path, size_t dgramlen, |
| 7499 | int path_challenge_recved, |
| 7500 | ngtcp2_tstamp ts) { |
| 7501 | ngtcp2_pv *pv = conn->pv; |
| 7502 | ngtcp2_dcid *bound_dcid; |
| 7503 | int rv; |
| 7504 | |
| 7505 | if (pv) { |
| 7506 | if (ngtcp2_path_eq(&pv->dcid.ps.path, path)) { |
| 7507 | pv->dcid.bytes_recv += dgramlen; |
| 7508 | return 0; |
| 7509 | } |
| 7510 | |
| 7511 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 7512 | ngtcp2_path_eq(&pv->fallback_dcid.ps.path, path)) { |
| 7513 | pv->fallback_dcid.bytes_recv += dgramlen; |
| 7514 | return 0; |
| 7515 | } |
| 7516 | } |
| 7517 | |
| 7518 | if (!path_challenge_recved) { |
| 7519 | return 0; |
| 7520 | } |
| 7521 | |
| 7522 | rv = conn_bind_dcid(conn, &bound_dcid, path, ts); |
| 7523 | if (rv != 0) { |
| 7524 | return rv; |
| 7525 | } |
| 7526 | |
| 7527 | ngtcp2_path_copy(&bound_dcid->ps.path, path); |
| 7528 | bound_dcid->bytes_recv += dgramlen; |
| 7529 | |
| 7530 | return 0; |
| 7531 | } |
| 7532 | |
| 7533 | /* |
| 7534 | * conn_recv_delayed_handshake_pkt processes the received Handshake |
| 7535 | * packet which is received after handshake completed. This function |
| 7536 | * does the minimal job, and its purpose is send acknowledgement of |
| 7537 | * this packet to the peer. We assume that hd->type == |
| 7538 | * NGTCP2_PKT_HANDSHAKE. |
| 7539 | * |
| 7540 | * This function returns 0 if it succeeds, or one of the following |
| 7541 | * negative error codes: |
| 7542 | * |
| 7543 | * NGTCP2_ERR_FRAME_ENCODING |
| 7544 | * Frame is badly formatted; or frame type is unknown. |
| 7545 | * NGTCP2_ERR_NOMEM |
| 7546 | * Out of memory |
| 7547 | * NGTCP2_ERR_DISCARD_PKT |
| 7548 | * Packet was discarded. |
| 7549 | * NGTCP2_ERR_ACK_FRAME |
| 7550 | * ACK frame is malformed. |
| 7551 | * NGTCP2_ERR_PROTO |
| 7552 | * Frame that is not allowed in Handshake packet is received. |
| 7553 | */ |
| 7554 | static int |
| 7555 | conn_recv_delayed_handshake_pkt(ngtcp2_conn *conn, const ngtcp2_pkt_info *pi, |
| 7556 | const ngtcp2_pkt_hd *hd, size_t pktlen, |
| 7557 | const uint8_t *payload, size_t payloadlen, |
| 7558 | ngtcp2_tstamp pkt_ts, ngtcp2_tstamp ts) { |
| 7559 | ngtcp2_ssize nread; |
| 7560 | ngtcp2_max_frame mfr; |
| 7561 | ngtcp2_frame *fr = &mfr.fr; |
| 7562 | int rv; |
| 7563 | int require_ack = 0; |
| 7564 | ngtcp2_pktns *pktns; |
| 7565 | |
| 7566 | assert(hd->type == NGTCP2_PKT_HANDSHAKE)((void) (0)); |
| 7567 | |
| 7568 | pktns = conn->hs_pktns; |
| 7569 | |
| 7570 | if (payloadlen == 0) { |
| 7571 | /* QUIC packet must contain at least one frame */ |
| 7572 | return NGTCP2_ERR_PROTO-205; |
| 7573 | } |
| 7574 | |
| 7575 | ngtcp2_qlog_pkt_received_start(&conn->qlog); |
| 7576 | |
| 7577 | for (; payloadlen;) { |
| 7578 | nread = ngtcp2_pkt_decode_frame(fr, payload, payloadlen); |
| 7579 | if (nread < 0) { |
| 7580 | return (int)nread; |
| 7581 | } |
| 7582 | |
| 7583 | payload += nread; |
| 7584 | payloadlen -= (size_t)nread; |
| 7585 | |
| 7586 | switch (fr->type) { |
| 7587 | case NGTCP2_FRAME_ACK: |
| 7588 | case NGTCP2_FRAME_ACK_ECN: |
| 7589 | fr->ack.ack_delay = 0; |
| 7590 | fr->ack.ack_delay_unscaled = 0; |
| 7591 | break; |
| 7592 | } |
| 7593 | |
| 7594 | ngtcp2_log_rx_fr(&conn->log, hd, fr); |
| 7595 | |
| 7596 | switch (fr->type) { |
| 7597 | case NGTCP2_FRAME_ACK: |
| 7598 | case NGTCP2_FRAME_ACK_ECN: |
| 7599 | if (!conn->server) { |
| 7600 | conn->flags |= NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000; |
| 7601 | } |
| 7602 | rv = conn_recv_ack(conn, pktns, &fr->ack, pkt_ts, ts); |
| 7603 | if (rv != 0) { |
| 7604 | return rv; |
| 7605 | } |
| 7606 | break; |
| 7607 | case NGTCP2_FRAME_PADDING: |
| 7608 | break; |
| 7609 | case NGTCP2_FRAME_CONNECTION_CLOSE: |
| 7610 | conn_recv_connection_close(conn, &fr->connection_close); |
| 7611 | break; |
| 7612 | case NGTCP2_FRAME_CRYPTO: |
| 7613 | case NGTCP2_FRAME_PING: |
| 7614 | require_ack = 1; |
| 7615 | break; |
| 7616 | default: |
| 7617 | return NGTCP2_ERR_PROTO-205; |
| 7618 | } |
| 7619 | |
| 7620 | ngtcp2_qlog_write_frame(&conn->qlog, fr); |
| 7621 | } |
| 7622 | |
| 7623 | ngtcp2_qlog_pkt_received_end(&conn->qlog, hd, pktlen); |
| 7624 | |
| 7625 | rv = pktns_commit_recv_pkt_num(pktns, hd->pkt_num, require_ack, pkt_ts); |
| 7626 | if (rv != 0) { |
| 7627 | return rv; |
| 7628 | } |
| 7629 | |
| 7630 | pktns_increase_ecn_counts(pktns, pi); |
| 7631 | |
| 7632 | if (require_ack && |
| 7633 | (++pktns->acktr.rx_npkt >= conn->local.settings.ack_thresh || |
| 7634 | (pi->ecn & NGTCP2_ECN_MASK0x3) == NGTCP2_ECN_CE0x3)) { |
| 7635 | ngtcp2_acktr_immediate_ack(&pktns->acktr); |
| 7636 | } |
| 7637 | |
| 7638 | rv = ngtcp2_conn_sched_ack(conn, &pktns->acktr, hd->pkt_num, require_ack, |
| 7639 | pkt_ts); |
| 7640 | if (rv != 0) { |
| 7641 | return rv; |
| 7642 | } |
| 7643 | |
| 7644 | conn_restart_timer_on_read(conn, ts); |
| 7645 | |
| 7646 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 7647 | |
| 7648 | return 0; |
| 7649 | } |
| 7650 | |
| 7651 | /* |
| 7652 | * conn_recv_pkt processes a packet contained in the buffer pointed by |
| 7653 | * |pkt| of length |pktlen|. |pkt| may contain multiple QUIC packets. |
| 7654 | * This function only processes the first packet. |pkt_ts| is the |
| 7655 | * timestamp when packet is received. |ts| should be the current |
| 7656 | * time. Usually they are the same, but for buffered packets, |
| 7657 | * |pkt_ts| would be earlier than |ts|. |
| 7658 | * |
| 7659 | * This function returns the number of bytes processed if it succeeds, |
| 7660 | * or one of the following negative error codes: |
| 7661 | * |
| 7662 | * NGTCP2_ERR_DISCARD_PKT |
| 7663 | * Packet was discarded because plain text header was malformed; |
| 7664 | * or its payload could not be decrypted. |
| 7665 | * NGTCP2_ERR_PROTO |
| 7666 | * Packet is badly formatted; or 0RTT packet contains other than |
| 7667 | * PADDING or STREAM frames; or other QUIC protocol violation is |
| 7668 | * found. |
| 7669 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 7670 | * User-defined callback function failed. |
| 7671 | * NGTCP2_ERR_NOMEM |
| 7672 | * Out of memory. |
| 7673 | * NGTCP2_ERR_FRAME_ENCODING |
| 7674 | * Frame is badly formatted; or frame type is unknown. |
| 7675 | * NGTCP2_ERR_ACK_FRAME |
| 7676 | * ACK frame is malformed. |
| 7677 | * NGTCP2_ERR_STREAM_STATE |
| 7678 | * Frame is received to the local stream which is not initiated. |
| 7679 | * NGTCP2_ERR_STREAM_LIMIT |
| 7680 | * Frame has remote stream ID which is strictly greater than the |
| 7681 | * allowed limit. |
| 7682 | * NGTCP2_ERR_FLOW_CONTROL |
| 7683 | * Flow control limit is violated. |
| 7684 | * NGTCP2_ERR_FINAL_SIZE |
| 7685 | * Frame has strictly larger end offset than it is permitted. |
| 7686 | */ |
| 7687 | static ngtcp2_ssize conn_recv_pkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 7688 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 7689 | size_t pktlen, size_t dgramlen, |
| 7690 | ngtcp2_tstamp pkt_ts, ngtcp2_tstamp ts) { |
| 7691 | ngtcp2_pkt_hd hd; |
| 7692 | int rv = 0; |
| 7693 | size_t hdpktlen; |
| 7694 | const uint8_t *payload; |
| 7695 | size_t payloadlen; |
| 7696 | ngtcp2_ssize nread, nwrite; |
| 7697 | ngtcp2_max_frame mfr; |
| 7698 | ngtcp2_frame *fr = &mfr.fr; |
| 7699 | int require_ack = 0; |
| 7700 | ngtcp2_crypto_aead *aead; |
| 7701 | ngtcp2_crypto_cipher *hp; |
| 7702 | ngtcp2_crypto_km *ckm; |
| 7703 | ngtcp2_crypto_cipher_ctx *hp_ctx; |
| 7704 | ngtcp2_hp_mask hp_mask; |
| 7705 | ngtcp2_decrypt decrypt; |
| 7706 | ngtcp2_pktns *pktns; |
| 7707 | int non_probing_pkt = 0; |
| 7708 | int key_phase_bit_changed = 0; |
| 7709 | int force_decrypt_failure = 0; |
| 7710 | int recv_ncid = 0; |
| 7711 | int new_cid_used = 0; |
| 7712 | int path_challenge_recved = 0; |
| 7713 | |
| 7714 | if (pkt[0] & NGTCP2_HEADER_FORM_BIT0x80) { |
| 7715 | nread = ngtcp2_pkt_decode_hd_long(&hd, pkt, pktlen); |
| 7716 | if (nread < 0) { |
| 7717 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7718 | "could not decode long header"); |
| 7719 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7720 | } |
| 7721 | |
| 7722 | if (pktlen < (size_t)nread + hd.len || conn->version != hd.version) { |
| 7723 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7724 | } |
| 7725 | |
| 7726 | pktlen = (size_t)nread + hd.len; |
| 7727 | |
| 7728 | /* Quoted from spec: if subsequent packets of those types include |
| 7729 | a different Source Connection ID, they MUST be discarded. */ |
| 7730 | if (!ngtcp2_cid_eq(&conn->dcid.current.cid, &hd.scid)) { |
| 7731 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 7732 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7733 | "packet was ignored because of mismatched SCID"); |
| 7734 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7735 | } |
| 7736 | |
| 7737 | switch (hd.type) { |
| 7738 | case NGTCP2_PKT_INITIAL: |
| 7739 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7740 | "delayed Initial packet was discarded"); |
| 7741 | return (ngtcp2_ssize)pktlen; |
| 7742 | case NGTCP2_PKT_HANDSHAKE: |
| 7743 | if (!conn->hs_pktns) { |
| 7744 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7745 | "delayed Handshake packet was discarded"); |
| 7746 | return (ngtcp2_ssize)pktlen; |
| 7747 | } |
| 7748 | |
| 7749 | pktns = conn->hs_pktns; |
| 7750 | aead = &pktns->crypto.ctx.aead; |
| 7751 | hp = &pktns->crypto.ctx.hp; |
| 7752 | ckm = pktns->crypto.rx.ckm; |
| 7753 | hp_ctx = &pktns->crypto.rx.hp_ctx; |
| 7754 | hp_mask = conn->callbacks.hp_mask; |
| 7755 | decrypt = conn->callbacks.decrypt; |
| 7756 | break; |
| 7757 | case NGTCP2_PKT_0RTT: |
| 7758 | if (!conn->server) { |
| 7759 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7760 | } |
| 7761 | |
| 7762 | if (!conn->early.ckm) { |
| 7763 | return (ngtcp2_ssize)pktlen; |
| 7764 | } |
| 7765 | |
| 7766 | pktns = &conn->pktns; |
| 7767 | aead = &conn->early.ctx.aead; |
| 7768 | hp = &conn->early.ctx.hp; |
| 7769 | ckm = conn->early.ckm; |
| 7770 | hp_ctx = &conn->early.hp_ctx; |
| 7771 | hp_mask = conn->callbacks.hp_mask; |
| 7772 | decrypt = conn->callbacks.decrypt; |
| 7773 | break; |
| 7774 | default: |
| 7775 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 7776 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7777 | "packet type 0x%02x was ignored", hd.type); |
| 7778 | return (ngtcp2_ssize)pktlen; |
| 7779 | } |
| 7780 | } else { |
| 7781 | nread = ngtcp2_pkt_decode_hd_short(&hd, pkt, pktlen, conn->oscid.datalen); |
| 7782 | if (nread < 0) { |
| 7783 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7784 | "could not decode short header"); |
| 7785 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7786 | } |
| 7787 | |
| 7788 | pktns = &conn->pktns; |
| 7789 | aead = &pktns->crypto.ctx.aead; |
| 7790 | hp = &pktns->crypto.ctx.hp; |
| 7791 | ckm = pktns->crypto.rx.ckm; |
| 7792 | hp_ctx = &pktns->crypto.rx.hp_ctx; |
| 7793 | hp_mask = conn->callbacks.hp_mask; |
| 7794 | decrypt = conn->callbacks.decrypt; |
| 7795 | } |
| 7796 | |
| 7797 | rv = conn_ensure_decrypt_hp_buffer(conn, (size_t)nread + 4); |
| 7798 | if (rv != 0) { |
| 7799 | return rv; |
| 7800 | } |
| 7801 | |
| 7802 | nwrite = decrypt_hp(&hd, conn->crypto.decrypt_hp_buf.base, hp, pkt, pktlen, |
| 7803 | (size_t)nread, ckm, hp_ctx, hp_mask); |
| 7804 | if (nwrite < 0) { |
| 7805 | if (ngtcp2_err_is_fatal((int)nwrite)) { |
| 7806 | return nwrite; |
| 7807 | } |
| 7808 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7809 | "could not decrypt packet number"); |
| 7810 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7811 | } |
| 7812 | |
| 7813 | hdpktlen = (size_t)nwrite; |
| 7814 | payload = pkt + hdpktlen; |
| 7815 | payloadlen = pktlen - hdpktlen; |
| 7816 | |
| 7817 | hd.pkt_num = ngtcp2_pkt_adjust_pkt_num(pktns->rx.max_pkt_num, hd.pkt_num, |
| 7818 | pkt_num_bits(hd.pkt_numlen)); |
| 7819 | if (hd.pkt_num > NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1))) { |
| 7820 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7821 | "pkn=%" PRId64"l" "d" " is greater than maximum pkn", hd.pkt_num); |
| 7822 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7823 | } |
| 7824 | |
| 7825 | ngtcp2_log_rx_pkt_hd(&conn->log, &hd); |
| 7826 | |
| 7827 | if (hd.type == NGTCP2_PKT_SHORT) { |
| 7828 | key_phase_bit_changed = conn_key_phase_changed(conn, &hd); |
| 7829 | } |
| 7830 | |
| 7831 | rv = conn_ensure_decrypt_buffer(conn, payloadlen); |
| 7832 | if (rv != 0) { |
| 7833 | return rv; |
| 7834 | } |
| 7835 | |
| 7836 | if (key_phase_bit_changed) { |
| 7837 | assert(hd.type == NGTCP2_PKT_SHORT)((void) (0)); |
| 7838 | |
| 7839 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, "unexpected KEY_PHASE"); |
| 7840 | |
| 7841 | if (ckm->pkt_num > hd.pkt_num) { |
| 7842 | if (conn->crypto.key_update.old_rx_ckm) { |
| 7843 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7844 | "decrypting with old key"); |
| 7845 | ckm = conn->crypto.key_update.old_rx_ckm; |
| 7846 | } else { |
| 7847 | force_decrypt_failure = 1; |
| 7848 | } |
| 7849 | } else if (pktns->rx.max_pkt_num < hd.pkt_num) { |
| 7850 | assert(ckm->pkt_num < hd.pkt_num)((void) (0)); |
| 7851 | if (!conn->crypto.key_update.new_rx_ckm) { |
| 7852 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7853 | "new key is not available"); |
| 7854 | force_decrypt_failure = 1; |
| 7855 | } else { |
| 7856 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7857 | "decrypting with new key"); |
| 7858 | ckm = conn->crypto.key_update.new_rx_ckm; |
| 7859 | } |
| 7860 | } else { |
| 7861 | force_decrypt_failure = 1; |
| 7862 | } |
| 7863 | } |
| 7864 | |
| 7865 | nwrite = decrypt_pkt(conn->crypto.decrypt_buf.base, aead, payload, payloadlen, |
| 7866 | conn->crypto.decrypt_hp_buf.base, hdpktlen, hd.pkt_num, |
| 7867 | ckm, decrypt); |
| 7868 | |
| 7869 | if (force_decrypt_failure) { |
| 7870 | nwrite = NGTCP2_ERR_TLS_DECRYPT-220; |
| 7871 | } |
| 7872 | |
| 7873 | if (nwrite < 0) { |
| 7874 | if (ngtcp2_err_is_fatal((int)nwrite)) { |
| 7875 | return nwrite; |
| 7876 | } |
| 7877 | |
| 7878 | assert(NGTCP2_ERR_TLS_DECRYPT == nwrite)((void) (0)); |
| 7879 | |
| 7880 | if (hd.type == NGTCP2_PKT_SHORT && |
| 7881 | ++conn->crypto.decryption_failure_count >= |
| 7882 | pktns->crypto.ctx.max_decryption_failure) { |
| 7883 | return NGTCP2_ERR_AEAD_LIMIT_REACHED-243; |
| 7884 | } |
| 7885 | |
| 7886 | if (hd.flags & NGTCP2_PKT_FLAG_LONG_FORM0x01) { |
| 7887 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7888 | "could not decrypt packet payload"); |
| 7889 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7890 | } |
| 7891 | |
| 7892 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7893 | "could not decrypt packet payload"); |
| 7894 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7895 | } |
| 7896 | |
| 7897 | rv = ngtcp2_pkt_verify_reserved_bits(conn->crypto.decrypt_hp_buf.base[0]); |
| 7898 | if (rv != 0) { |
| 7899 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7900 | "packet has incorrect reserved bits"); |
| 7901 | |
| 7902 | return NGTCP2_ERR_PROTO-205; |
| 7903 | } |
| 7904 | |
| 7905 | if (pktns_pkt_num_is_duplicate(pktns, hd.pkt_num)) { |
| 7906 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7907 | "packet was discarded because of duplicated packet number"); |
| 7908 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7909 | } |
| 7910 | |
| 7911 | payload = conn->crypto.decrypt_buf.base; |
| 7912 | payloadlen = (size_t)nwrite; |
| 7913 | |
| 7914 | if (payloadlen == 0) { |
| 7915 | /* QUIC packet must contain at least one frame */ |
| 7916 | return NGTCP2_ERR_PROTO-205; |
| 7917 | } |
| 7918 | |
| 7919 | if (hd.flags & NGTCP2_PKT_FLAG_LONG_FORM0x01) { |
| 7920 | switch (hd.type) { |
| 7921 | case NGTCP2_PKT_HANDSHAKE: |
| 7922 | rv = conn_verify_dcid(conn, NULL((void*)0), &hd); |
| 7923 | if (rv != 0) { |
| 7924 | if (ngtcp2_err_is_fatal(rv)) { |
| 7925 | return rv; |
| 7926 | } |
| 7927 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7928 | "packet was ignored because of mismatched DCID"); |
| 7929 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7930 | } |
| 7931 | |
| 7932 | rv = conn_recv_delayed_handshake_pkt(conn, pi, &hd, pktlen, payload, |
| 7933 | payloadlen, pkt_ts, ts); |
| 7934 | if (rv < 0) { |
| 7935 | return (ngtcp2_ssize)rv; |
| 7936 | } |
| 7937 | |
| 7938 | return (ngtcp2_ssize)pktlen; |
| 7939 | case NGTCP2_PKT_0RTT: |
| 7940 | if (!ngtcp2_cid_eq(&conn->rcid, &hd.dcid)) { |
| 7941 | rv = conn_verify_dcid(conn, NULL((void*)0), &hd); |
| 7942 | if (rv != 0) { |
| 7943 | if (ngtcp2_err_is_fatal(rv)) { |
| 7944 | return rv; |
| 7945 | } |
| 7946 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7947 | "packet was ignored because of mismatched DCID"); |
| 7948 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7949 | } |
| 7950 | } |
| 7951 | break; |
| 7952 | default: |
| 7953 | /* Unreachable */ |
| 7954 | assert(0)((void) (0)); |
| 7955 | } |
| 7956 | } else { |
| 7957 | rv = conn_verify_dcid(conn, &new_cid_used, &hd); |
| 7958 | if (rv != 0) { |
| 7959 | if (ngtcp2_err_is_fatal(rv)) { |
| 7960 | return rv; |
| 7961 | } |
| 7962 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 7963 | "packet was ignored because of mismatched DCID"); |
| 7964 | return NGTCP2_ERR_DISCARD_PKT-235; |
| 7965 | } |
| 7966 | |
| 7967 | conn->flags |= NGTCP2_CONN_FLAG_RECV_PROTECTED_PKT0x08; |
| 7968 | } |
| 7969 | |
| 7970 | ngtcp2_qlog_pkt_received_start(&conn->qlog); |
| 7971 | |
| 7972 | for (; payloadlen;) { |
| 7973 | nread = ngtcp2_pkt_decode_frame(fr, payload, payloadlen); |
| 7974 | if (nread < 0) { |
| 7975 | return nread; |
| 7976 | } |
| 7977 | |
| 7978 | payload += nread; |
| 7979 | payloadlen -= (size_t)nread; |
| 7980 | |
| 7981 | switch (fr->type) { |
| 7982 | case NGTCP2_FRAME_ACK: |
| 7983 | case NGTCP2_FRAME_ACK_ECN: |
| 7984 | if ((hd.flags & NGTCP2_PKT_FLAG_LONG_FORM0x01) && |
| 7985 | hd.type == NGTCP2_PKT_0RTT) { |
| 7986 | return NGTCP2_ERR_PROTO-205; |
| 7987 | } |
| 7988 | assign_recved_ack_delay_unscaled( |
| 7989 | &fr->ack, conn->remote.transport_params.ack_delay_exponent); |
| 7990 | break; |
| 7991 | } |
| 7992 | |
| 7993 | ngtcp2_log_rx_fr(&conn->log, &hd, fr); |
| 7994 | |
| 7995 | if (hd.type == NGTCP2_PKT_0RTT) { |
| 7996 | switch (fr->type) { |
| 7997 | case NGTCP2_FRAME_PADDING: |
| 7998 | case NGTCP2_FRAME_PING: |
| 7999 | case NGTCP2_FRAME_RESET_STREAM: |
| 8000 | case NGTCP2_FRAME_STOP_SENDING: |
| 8001 | case NGTCP2_FRAME_STREAM: |
| 8002 | case NGTCP2_FRAME_MAX_DATA: |
| 8003 | case NGTCP2_FRAME_MAX_STREAM_DATA: |
| 8004 | case NGTCP2_FRAME_MAX_STREAMS_BIDI: |
| 8005 | case NGTCP2_FRAME_MAX_STREAMS_UNI: |
| 8006 | case NGTCP2_FRAME_DATA_BLOCKED: |
| 8007 | case NGTCP2_FRAME_STREAM_DATA_BLOCKED: |
| 8008 | case NGTCP2_FRAME_STREAMS_BLOCKED_BIDI: |
| 8009 | case NGTCP2_FRAME_STREAMS_BLOCKED_UNI: |
| 8010 | case NGTCP2_FRAME_NEW_CONNECTION_ID: |
| 8011 | case NGTCP2_FRAME_PATH_CHALLENGE: |
| 8012 | case NGTCP2_FRAME_CONNECTION_CLOSE: |
| 8013 | case NGTCP2_FRAME_CONNECTION_CLOSE_APP: |
| 8014 | case NGTCP2_FRAME_DATAGRAM: |
| 8015 | case NGTCP2_FRAME_DATAGRAM_LEN: |
| 8016 | break; |
| 8017 | default: |
| 8018 | return NGTCP2_ERR_PROTO-205; |
| 8019 | } |
| 8020 | } |
| 8021 | |
| 8022 | switch (fr->type) { |
| 8023 | case NGTCP2_FRAME_ACK: |
| 8024 | case NGTCP2_FRAME_ACK_ECN: |
| 8025 | case NGTCP2_FRAME_PADDING: |
| 8026 | case NGTCP2_FRAME_CONNECTION_CLOSE: |
| 8027 | case NGTCP2_FRAME_CONNECTION_CLOSE_APP: |
| 8028 | break; |
| 8029 | default: |
| 8030 | require_ack = 1; |
| 8031 | } |
| 8032 | |
| 8033 | switch (fr->type) { |
| 8034 | case NGTCP2_FRAME_ACK: |
| 8035 | case NGTCP2_FRAME_ACK_ECN: |
| 8036 | if (!conn->server) { |
| 8037 | conn->flags |= NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000; |
| 8038 | } |
| 8039 | rv = conn_recv_ack(conn, pktns, &fr->ack, pkt_ts, ts); |
| 8040 | if (rv != 0) { |
| 8041 | return rv; |
| 8042 | } |
| 8043 | non_probing_pkt = 1; |
| 8044 | break; |
| 8045 | case NGTCP2_FRAME_STREAM: |
| 8046 | rv = conn_recv_stream(conn, &fr->stream); |
| 8047 | if (rv != 0) { |
| 8048 | return rv; |
| 8049 | } |
| 8050 | non_probing_pkt = 1; |
| 8051 | break; |
| 8052 | case NGTCP2_FRAME_CRYPTO: |
| 8053 | rv = conn_recv_crypto(conn, NGTCP2_CRYPTO_LEVEL_APPLICATION, |
| 8054 | &pktns->crypto.strm, &fr->crypto); |
| 8055 | if (rv != 0) { |
| 8056 | return rv; |
| 8057 | } |
| 8058 | non_probing_pkt = 1; |
| 8059 | break; |
| 8060 | case NGTCP2_FRAME_RESET_STREAM: |
| 8061 | rv = conn_recv_reset_stream(conn, &fr->reset_stream); |
| 8062 | if (rv != 0) { |
| 8063 | return rv; |
| 8064 | } |
| 8065 | non_probing_pkt = 1; |
| 8066 | break; |
| 8067 | case NGTCP2_FRAME_STOP_SENDING: |
| 8068 | rv = conn_recv_stop_sending(conn, &fr->stop_sending); |
| 8069 | if (rv != 0) { |
| 8070 | return rv; |
| 8071 | } |
| 8072 | non_probing_pkt = 1; |
| 8073 | break; |
| 8074 | case NGTCP2_FRAME_MAX_STREAM_DATA: |
| 8075 | rv = conn_recv_max_stream_data(conn, &fr->max_stream_data); |
| 8076 | if (rv != 0) { |
| 8077 | return rv; |
| 8078 | } |
| 8079 | non_probing_pkt = 1; |
| 8080 | break; |
| 8081 | case NGTCP2_FRAME_MAX_DATA: |
| 8082 | conn_recv_max_data(conn, &fr->max_data); |
| 8083 | non_probing_pkt = 1; |
| 8084 | break; |
| 8085 | case NGTCP2_FRAME_MAX_STREAMS_BIDI: |
| 8086 | case NGTCP2_FRAME_MAX_STREAMS_UNI: |
| 8087 | rv = conn_recv_max_streams(conn, &fr->max_streams); |
| 8088 | if (rv != 0) { |
| 8089 | return rv; |
| 8090 | } |
| 8091 | non_probing_pkt = 1; |
| 8092 | break; |
| 8093 | case NGTCP2_FRAME_CONNECTION_CLOSE: |
| 8094 | case NGTCP2_FRAME_CONNECTION_CLOSE_APP: |
| 8095 | conn_recv_connection_close(conn, &fr->connection_close); |
| 8096 | break; |
| 8097 | case NGTCP2_FRAME_PING: |
| 8098 | non_probing_pkt = 1; |
| 8099 | break; |
| 8100 | case NGTCP2_FRAME_PATH_CHALLENGE: |
| 8101 | conn_recv_path_challenge(conn, path, &fr->path_challenge); |
| 8102 | path_challenge_recved = 1; |
| 8103 | break; |
| 8104 | case NGTCP2_FRAME_PATH_RESPONSE: |
| 8105 | rv = conn_recv_path_response(conn, &fr->path_response, ts); |
| 8106 | if (rv != 0) { |
| 8107 | return rv; |
| 8108 | } |
| 8109 | break; |
| 8110 | case NGTCP2_FRAME_NEW_CONNECTION_ID: |
| 8111 | rv = conn_recv_new_connection_id(conn, &fr->new_connection_id); |
| 8112 | if (rv != 0) { |
| 8113 | return rv; |
| 8114 | } |
| 8115 | recv_ncid = 1; |
| 8116 | break; |
| 8117 | case NGTCP2_FRAME_RETIRE_CONNECTION_ID: |
| 8118 | rv = conn_recv_retire_connection_id(conn, &hd, &fr->retire_connection_id, |
| 8119 | ts); |
| 8120 | if (rv != 0) { |
| 8121 | return rv; |
| 8122 | } |
| 8123 | non_probing_pkt = 1; |
| 8124 | break; |
| 8125 | case NGTCP2_FRAME_NEW_TOKEN: |
| 8126 | rv = conn_recv_new_token(conn, &fr->new_token); |
| 8127 | if (rv != 0) { |
| 8128 | return rv; |
| 8129 | } |
| 8130 | non_probing_pkt = 1; |
| 8131 | break; |
| 8132 | case NGTCP2_FRAME_HANDSHAKE_DONE: |
| 8133 | rv = conn_recv_handshake_done(conn, ts); |
| 8134 | if (rv != 0) { |
| 8135 | return rv; |
| 8136 | } |
| 8137 | non_probing_pkt = 1; |
| 8138 | break; |
| 8139 | case NGTCP2_FRAME_STREAMS_BLOCKED_BIDI: |
| 8140 | rv = conn_recv_streams_blocked_bidi(conn, &fr->streams_blocked); |
| 8141 | if (rv != 0) { |
| 8142 | return rv; |
| 8143 | } |
| 8144 | non_probing_pkt = 1; |
| 8145 | break; |
| 8146 | case NGTCP2_FRAME_STREAMS_BLOCKED_UNI: |
| 8147 | rv = conn_recv_streams_blocked_uni(conn, &fr->streams_blocked); |
| 8148 | if (rv != 0) { |
| 8149 | return rv; |
| 8150 | } |
| 8151 | non_probing_pkt = 1; |
| 8152 | break; |
| 8153 | case NGTCP2_FRAME_DATA_BLOCKED: |
| 8154 | /* TODO Not implemented yet */ |
| 8155 | non_probing_pkt = 1; |
| 8156 | break; |
| 8157 | case NGTCP2_FRAME_DATAGRAM: |
| 8158 | case NGTCP2_FRAME_DATAGRAM_LEN: |
| 8159 | if ((uint64_t)nread > |
| 8160 | conn->local.transport_params.max_datagram_frame_size) { |
| 8161 | return NGTCP2_ERR_PROTO-205; |
| 8162 | } |
| 8163 | rv = conn_recv_datagram(conn, &fr->datagram); |
| 8164 | if (rv != 0) { |
| 8165 | return rv; |
| 8166 | } |
| 8167 | non_probing_pkt = 1; |
| 8168 | break; |
| 8169 | } |
| 8170 | |
| 8171 | ngtcp2_qlog_write_frame(&conn->qlog, fr); |
| 8172 | } |
| 8173 | |
| 8174 | ngtcp2_qlog_pkt_received_end(&conn->qlog, &hd, pktlen); |
| 8175 | |
| 8176 | if (recv_ncid) { |
| 8177 | rv = conn_post_process_recv_new_connection_id(conn, ts); |
| 8178 | if (rv != 0) { |
| 8179 | return rv; |
| 8180 | } |
| 8181 | } |
| 8182 | |
| 8183 | if (conn->server && hd.type == NGTCP2_PKT_SHORT && |
| 8184 | !ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 8185 | if (non_probing_pkt && pktns->rx.max_pkt_num < hd.pkt_num && |
| 8186 | !conn_path_validation_in_progress(conn, path)) { |
| 8187 | rv = conn_recv_non_probing_pkt_on_new_path(conn, path, dgramlen, |
| 8188 | new_cid_used, ts); |
| 8189 | if (rv != 0) { |
| 8190 | if (ngtcp2_err_is_fatal(rv)) { |
| 8191 | return rv; |
| 8192 | } |
| 8193 | |
| 8194 | /* DCID is not available. Just continue. */ |
| 8195 | assert(NGTCP2_ERR_CONN_ID_BLOCKED == rv)((void) (0)); |
| 8196 | } |
| 8197 | } else { |
| 8198 | rv = conn_recv_pkt_from_new_path(conn, path, dgramlen, |
| 8199 | path_challenge_recved, ts); |
| 8200 | if (rv != 0) { |
| 8201 | if (ngtcp2_err_is_fatal(rv)) { |
| 8202 | return rv; |
| 8203 | } |
| 8204 | |
| 8205 | /* DCID is not available. Just continue. */ |
| 8206 | assert(NGTCP2_ERR_CONN_ID_BLOCKED == rv)((void) (0)); |
| 8207 | } |
| 8208 | } |
| 8209 | } |
| 8210 | |
| 8211 | if (hd.type == NGTCP2_PKT_SHORT) { |
| 8212 | if (ckm == conn->crypto.key_update.new_rx_ckm) { |
| 8213 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, "rotate keys"); |
| 8214 | conn_rotate_keys(conn, hd.pkt_num); |
| 8215 | } else if (ckm->pkt_num > hd.pkt_num) { |
| 8216 | ckm->pkt_num = hd.pkt_num; |
| 8217 | } |
| 8218 | |
| 8219 | if (conn->server && conn->early.ckm && |
| 8220 | conn->early.discard_started_ts == UINT64_MAX(18446744073709551615UL)) { |
| 8221 | conn->early.discard_started_ts = ts; |
| 8222 | } |
| 8223 | } |
| 8224 | |
| 8225 | rv = pktns_commit_recv_pkt_num(pktns, hd.pkt_num, require_ack, pkt_ts); |
| 8226 | if (rv != 0) { |
| 8227 | return rv; |
| 8228 | } |
| 8229 | |
| 8230 | pktns_increase_ecn_counts(pktns, pi); |
| 8231 | |
| 8232 | if (require_ack && |
| 8233 | (++pktns->acktr.rx_npkt >= conn->local.settings.ack_thresh || |
| 8234 | (pi->ecn & NGTCP2_ECN_MASK0x3) == NGTCP2_ECN_CE0x3)) { |
| 8235 | ngtcp2_acktr_immediate_ack(&pktns->acktr); |
| 8236 | } |
| 8237 | |
| 8238 | rv = ngtcp2_conn_sched_ack(conn, &pktns->acktr, hd.pkt_num, require_ack, |
| 8239 | pkt_ts); |
| 8240 | if (rv != 0) { |
| 8241 | return rv; |
| 8242 | } |
| 8243 | |
| 8244 | conn_restart_timer_on_read(conn, ts); |
| 8245 | |
| 8246 | ngtcp2_qlog_metrics_updated(&conn->qlog, &conn->cstat); |
| 8247 | |
| 8248 | return conn->state == NGTCP2_CS_DRAINING ? NGTCP2_ERR_DRAINING-231 |
| 8249 | : (ngtcp2_ssize)pktlen; |
| 8250 | } |
| 8251 | |
| 8252 | /* |
| 8253 | * conn_process_buffered_protected_pkt processes buffered 0RTT or |
| 8254 | * Short packets. |
| 8255 | * |
| 8256 | * This function returns 0 if it succeeds, or the same negative error |
| 8257 | * codes from conn_recv_pkt. |
| 8258 | */ |
| 8259 | static int conn_process_buffered_protected_pkt(ngtcp2_conn *conn, |
| 8260 | ngtcp2_pktns *pktns, |
| 8261 | ngtcp2_tstamp ts) { |
| 8262 | ngtcp2_ssize nread; |
| 8263 | ngtcp2_pkt_chain **ppc, *next; |
| 8264 | int rv; |
| 8265 | |
| 8266 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 8267 | "processing buffered protected packet"); |
| 8268 | |
| 8269 | for (ppc = &pktns->rx.buffed_pkts; *ppc;) { |
| 8270 | next = (*ppc)->next; |
| 8271 | nread = conn_recv_pkt(conn, &(*ppc)->path.path, &(*ppc)->pi, (*ppc)->pkt, |
| 8272 | (*ppc)->pktlen, (*ppc)->dgramlen, (*ppc)->ts, ts); |
| 8273 | if (nread < 0 && !ngtcp2_err_is_fatal((int)nread) && |
| 8274 | nread != NGTCP2_ERR_DRAINING-231) { |
| 8275 | /* TODO We don't know this is the first QUIC packet in a |
| 8276 | datagram. */ |
| 8277 | rv = conn_on_stateless_reset(conn, &(*ppc)->path.path, (*ppc)->pkt, |
| 8278 | (*ppc)->pktlen); |
| 8279 | if (rv == 0) { |
| 8280 | ngtcp2_pkt_chain_del(*ppc, conn->mem); |
| 8281 | *ppc = next; |
| 8282 | return NGTCP2_ERR_DRAINING-231; |
| 8283 | } |
| 8284 | } |
| 8285 | |
| 8286 | ngtcp2_pkt_chain_del(*ppc, conn->mem); |
| 8287 | *ppc = next; |
| 8288 | if (nread < 0) { |
| 8289 | if (nread == NGTCP2_ERR_DISCARD_PKT-235) { |
| 8290 | continue; |
| 8291 | } |
| 8292 | return (int)nread; |
| 8293 | } |
| 8294 | } |
| 8295 | |
| 8296 | return 0; |
| 8297 | } |
| 8298 | |
| 8299 | /* |
| 8300 | * conn_process_buffered_handshake_pkt processes buffered Handshake |
| 8301 | * packets. |
| 8302 | * |
| 8303 | * This function returns 0 if it succeeds, or the same negative error |
| 8304 | * codes from conn_recv_handshake_pkt. |
| 8305 | */ |
| 8306 | static int conn_process_buffered_handshake_pkt(ngtcp2_conn *conn, |
| 8307 | ngtcp2_tstamp ts) { |
| 8308 | ngtcp2_pktns *pktns = conn->hs_pktns; |
| 8309 | ngtcp2_ssize nread; |
| 8310 | ngtcp2_pkt_chain **ppc, *next; |
| 8311 | |
| 8312 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 8313 | "processing buffered handshake packet"); |
| 8314 | |
| 8315 | for (ppc = &pktns->rx.buffed_pkts; *ppc;) { |
| 8316 | next = (*ppc)->next; |
| 8317 | nread = conn_recv_handshake_pkt(conn, &(*ppc)->path.path, &(*ppc)->pi, |
| 8318 | (*ppc)->pkt, (*ppc)->pktlen, |
| 8319 | (*ppc)->dgramlen, (*ppc)->ts, ts); |
| 8320 | ngtcp2_pkt_chain_del(*ppc, conn->mem); |
| 8321 | *ppc = next; |
| 8322 | if (nread < 0) { |
| 8323 | if (nread == NGTCP2_ERR_DISCARD_PKT-235) { |
| 8324 | continue; |
| 8325 | } |
| 8326 | return (int)nread; |
| 8327 | } |
| 8328 | } |
| 8329 | |
| 8330 | return 0; |
| 8331 | } |
| 8332 | |
| 8333 | static void conn_sync_stream_id_limit(ngtcp2_conn *conn) { |
| 8334 | ngtcp2_transport_params *params = &conn->remote.transport_params; |
| 8335 | |
| 8336 | conn->local.bidi.max_streams = params->initial_max_streams_bidi; |
| 8337 | conn->local.uni.max_streams = params->initial_max_streams_uni; |
| 8338 | } |
| 8339 | |
| 8340 | /* |
| 8341 | * conn_handshake_completed is called once cryptographic handshake has |
| 8342 | * completed. |
| 8343 | * |
| 8344 | * This function returns 0 if it succeeds, or one of the following |
| 8345 | * negative error codes: |
| 8346 | * |
| 8347 | * NGTCP2_ERR_CALLBACK_FAILURE |
| 8348 | * User callback failed. |
| 8349 | */ |
| 8350 | static int conn_handshake_completed(ngtcp2_conn *conn) { |
| 8351 | int rv; |
| 8352 | |
| 8353 | conn->flags |= NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100; |
| 8354 | |
| 8355 | rv = conn_call_handshake_completed(conn); |
| 8356 | if (rv != 0) { |
| 8357 | return rv; |
| 8358 | } |
| 8359 | |
| 8360 | if (conn->local.bidi.max_streams > 0) { |
| 8361 | rv = conn_call_extend_max_local_streams_bidi(conn, |
| 8362 | conn->local.bidi.max_streams); |
| 8363 | if (rv != 0) { |
| 8364 | return rv; |
| 8365 | } |
| 8366 | } |
| 8367 | if (conn->local.uni.max_streams > 0) { |
| 8368 | rv = conn_call_extend_max_local_streams_uni(conn, |
| 8369 | conn->local.uni.max_streams); |
| 8370 | if (rv != 0) { |
| 8371 | return rv; |
| 8372 | } |
| 8373 | } |
| 8374 | |
| 8375 | return 0; |
| 8376 | } |
| 8377 | |
| 8378 | /* |
| 8379 | * conn_recv_cpkt processes compound packet after handshake. The |
| 8380 | * buffer pointed by |pkt| might contain multiple packets. The Short |
| 8381 | * packet must be the last one because it does not have payload length |
| 8382 | * field. |
| 8383 | * |
| 8384 | * This function returns 0 if it succeeds, or the same negative error |
| 8385 | * codes from conn_recv_pkt except for NGTCP2_ERR_DISCARD_PKT. |
| 8386 | */ |
| 8387 | static int conn_recv_cpkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 8388 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 8389 | size_t pktlen, ngtcp2_tstamp ts) { |
| 8390 | ngtcp2_ssize nread; |
| 8391 | int rv; |
| 8392 | const uint8_t *origpkt = pkt; |
| 8393 | size_t dgramlen = pktlen; |
| 8394 | |
| 8395 | if (ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 8396 | conn->dcid.current.bytes_recv += dgramlen; |
| 8397 | } |
| 8398 | |
| 8399 | while (pktlen) { |
| 8400 | nread = conn_recv_pkt(conn, path, pi, pkt, pktlen, dgramlen, ts, ts); |
| 8401 | if (nread < 0) { |
| 8402 | if (ngtcp2_err_is_fatal((int)nread)) { |
| 8403 | return (int)nread; |
| 8404 | } |
| 8405 | |
| 8406 | if (nread == NGTCP2_ERR_DRAINING-231) { |
| 8407 | return NGTCP2_ERR_DRAINING-231; |
| 8408 | } |
| 8409 | |
| 8410 | if (origpkt == pkt) { |
| 8411 | rv = conn_on_stateless_reset(conn, path, origpkt, dgramlen); |
| 8412 | if (rv == 0) { |
| 8413 | return NGTCP2_ERR_DRAINING-231; |
| 8414 | } |
| 8415 | } |
| 8416 | if (nread == NGTCP2_ERR_DISCARD_PKT-235) { |
| 8417 | return 0; |
| 8418 | } |
| 8419 | return (int)nread; |
| 8420 | } |
| 8421 | |
| 8422 | assert(pktlen >= (size_t)nread)((void) (0)); |
| 8423 | pkt += nread; |
| 8424 | pktlen -= (size_t)nread; |
| 8425 | |
| 8426 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_PKT, |
| 8427 | "read packet %td left %zu", nread, pktlen); |
| 8428 | } |
| 8429 | |
| 8430 | return 0; |
| 8431 | } |
| 8432 | |
| 8433 | /* |
| 8434 | * conn_is_retired_path returns nonzero if |path| is included in |
| 8435 | * retired path list. |
| 8436 | */ |
| 8437 | static int conn_is_retired_path(ngtcp2_conn *conn, const ngtcp2_path *path) { |
| 8438 | size_t i, len = ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len); |
| 8439 | ngtcp2_dcid *dcid; |
| 8440 | |
| 8441 | for (i = 0; i < len; ++i) { |
| 8442 | dcid = ngtcp2_ringbuf_get(&conn->dcid.retired, i); |
| 8443 | if (ngtcp2_path_eq(&dcid->ps.path, path)) { |
| 8444 | return 1; |
| 8445 | } |
| 8446 | } |
| 8447 | |
| 8448 | return 0; |
| 8449 | } |
| 8450 | |
| 8451 | /* |
| 8452 | * conn_enqueue_handshake_done enqueues HANDSHAKE_DONE frame for |
| 8453 | * transmission. |
| 8454 | */ |
| 8455 | static int conn_enqueue_handshake_done(ngtcp2_conn *conn) { |
| 8456 | ngtcp2_pktns *pktns = &conn->pktns; |
| 8457 | ngtcp2_frame_chain *nfrc; |
| 8458 | int rv; |
| 8459 | |
| 8460 | assert(conn->server)((void) (0)); |
| 8461 | |
| 8462 | rv = ngtcp2_frame_chain_new(&nfrc, conn->mem); |
| 8463 | if (rv != 0) { |
| 8464 | return rv; |
| 8465 | } |
| 8466 | |
| 8467 | nfrc->fr.type = NGTCP2_FRAME_HANDSHAKE_DONE; |
| 8468 | nfrc->next = pktns->tx.frq; |
| 8469 | pktns->tx.frq = nfrc; |
| 8470 | |
| 8471 | return 0; |
| 8472 | } |
| 8473 | |
| 8474 | /** |
| 8475 | * @function |
| 8476 | * |
| 8477 | * `conn_read_handshake` performs QUIC cryptographic handshake by |
| 8478 | * reading given data. |pkt| points to the buffer to read and |
| 8479 | * |pktlen| is the length of the buffer. |path| is the network path. |
| 8480 | * |
| 8481 | * This function returns 0 if it succeeds, or one of the following |
| 8482 | * negative error codes: (TBD). |
| 8483 | */ |
| 8484 | static int conn_read_handshake(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 8485 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 8486 | size_t pktlen, ngtcp2_tstamp ts) { |
| 8487 | int rv; |
| 8488 | |
| 8489 | switch (conn->state) { |
| 8490 | case NGTCP2_CS_CLIENT_INITIAL: |
| 8491 | /* TODO Better to log something when we ignore input */ |
| 8492 | return 0; |
| 8493 | case NGTCP2_CS_CLIENT_WAIT_HANDSHAKE: |
| 8494 | rv = conn_recv_handshake_cpkt(conn, path, pi, pkt, pktlen, ts); |
| 8495 | if (rv < 0) { |
| 8496 | return rv; |
| 8497 | } |
| 8498 | |
| 8499 | if (conn->state == NGTCP2_CS_CLIENT_INITIAL) { |
| 8500 | /* Retry packet was received */ |
| 8501 | return 0; |
| 8502 | } |
| 8503 | |
| 8504 | assert(conn->hs_pktns)((void) (0)); |
| 8505 | |
| 8506 | if (conn->hs_pktns->crypto.rx.ckm && conn->in_pktns) { |
| 8507 | rv = conn_process_buffered_handshake_pkt(conn, ts); |
| 8508 | if (rv != 0) { |
| 8509 | return rv; |
| 8510 | } |
| 8511 | } |
| 8512 | |
| 8513 | if ((conn->flags & (NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01 | |
| 8514 | NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100)) == |
| 8515 | NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) { |
| 8516 | rv = conn_handshake_completed(conn); |
| 8517 | if (rv != 0) { |
| 8518 | return rv; |
| 8519 | } |
| 8520 | } |
| 8521 | |
| 8522 | return 0; |
| 8523 | case NGTCP2_CS_SERVER_INITIAL: |
| 8524 | rv = conn_recv_handshake_cpkt(conn, path, pi, pkt, pktlen, ts); |
| 8525 | if (rv < 0) { |
| 8526 | return rv; |
| 8527 | } |
| 8528 | |
| 8529 | /* |
| 8530 | * Client ServerHello might not fit into single Initial packet |
| 8531 | * (e.g., resuming session with client authentication). If we get |
| 8532 | * Client Initial which does not increase offset or it is 0RTT |
| 8533 | * packet buffered, perform address validation in order to buffer |
| 8534 | * validated data only. |
| 8535 | */ |
| 8536 | if (ngtcp2_strm_rx_offset(&conn->in_pktns->crypto.strm) == 0) { |
| 8537 | if (conn->in_pktns->crypto.strm.rx.rob && |
| 8538 | ngtcp2_rob_data_buffered(conn->in_pktns->crypto.strm.rx.rob)) { |
| 8539 | /* Address has been validated with token */ |
| 8540 | if (conn->local.settings.token.len) { |
| 8541 | return 0; |
| 8542 | } |
| 8543 | return NGTCP2_ERR_RETRY-241; |
| 8544 | } |
| 8545 | if (conn->in_pktns->rx.buffed_pkts) { |
| 8546 | /* 0RTT is buffered, force retry */ |
| 8547 | return NGTCP2_ERR_RETRY-241; |
| 8548 | } |
| 8549 | /* If neither CRYPTO frame nor 0RTT packet is processed, just |
| 8550 | drop connection. */ |
| 8551 | return NGTCP2_ERR_DROP_CONN-242; |
| 8552 | } |
| 8553 | |
| 8554 | /* Process re-ordered 0-RTT packets which arrived before Initial |
| 8555 | packet. */ |
| 8556 | if (conn->early.ckm) { |
| 8557 | assert(conn->in_pktns)((void) (0)); |
| 8558 | |
| 8559 | rv = conn_process_buffered_protected_pkt(conn, conn->in_pktns, ts); |
| 8560 | if (rv != 0) { |
| 8561 | return rv; |
| 8562 | } |
| 8563 | } |
| 8564 | |
| 8565 | return 0; |
| 8566 | case NGTCP2_CS_SERVER_WAIT_HANDSHAKE: |
| 8567 | rv = conn_recv_handshake_cpkt(conn, path, pi, pkt, pktlen, ts); |
| 8568 | if (rv < 0) { |
| 8569 | return rv; |
| 8570 | } |
| 8571 | |
| 8572 | if (conn->hs_pktns->crypto.rx.ckm) { |
| 8573 | rv = conn_process_buffered_handshake_pkt(conn, ts); |
| 8574 | if (rv != 0) { |
| 8575 | return rv; |
| 8576 | } |
| 8577 | } |
| 8578 | |
| 8579 | if (conn->hs_pktns->rx.max_pkt_num != -1) { |
| 8580 | conn_discard_initial_state(conn, ts); |
| 8581 | } |
| 8582 | |
| 8583 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 8584 | /* If server hits amplification limit, it cancels loss detection |
| 8585 | timer. If server receives a packet from client, the limit is |
| 8586 | increased and server can send more. If server has |
| 8587 | ack-eliciting Initial or Handshake packets, it should resend |
| 8588 | it if timer fired but timer is not armed in this case. So |
| 8589 | instead of resending Initial/Handshake packets, if server has |
| 8590 | 1RTT data to send, it might send them and then might hit |
| 8591 | amplification limit again until it hits stream data limit. |
| 8592 | Initial/Handshake data is not resent. In order to avoid this |
| 8593 | situation, try to arm loss detection and check the expiry |
| 8594 | here so that on next write call, we can resend |
| 8595 | Initial/Handshake first. */ |
| 8596 | if (conn->cstat.loss_detection_timer == UINT64_MAX(18446744073709551615UL)) { |
| 8597 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 8598 | if (ngtcp2_conn_loss_detection_expiry(conn) <= ts) { |
| 8599 | rv = ngtcp2_conn_on_loss_detection_timer(conn, ts); |
| 8600 | if (rv != 0) { |
| 8601 | return rv; |
| 8602 | } |
| 8603 | } |
| 8604 | } |
| 8605 | |
| 8606 | return 0; |
| 8607 | } |
| 8608 | |
| 8609 | if (!(conn->flags & NGTCP2_CONN_FLAG_TRANSPORT_PARAM_RECVED0x04)) { |
| 8610 | return NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM-217; |
| 8611 | } |
| 8612 | |
| 8613 | rv = conn_handshake_completed(conn); |
| 8614 | if (rv != 0) { |
| 8615 | return rv; |
| 8616 | } |
| 8617 | conn->state = NGTCP2_CS_POST_HANDSHAKE; |
| 8618 | |
| 8619 | rv = conn_call_activate_dcid(conn, &conn->dcid.current); |
| 8620 | if (rv != 0) { |
| 8621 | return rv; |
| 8622 | } |
| 8623 | |
| 8624 | rv = conn_process_buffered_protected_pkt(conn, &conn->pktns, ts); |
| 8625 | if (rv != 0) { |
| 8626 | return rv; |
| 8627 | } |
| 8628 | |
| 8629 | conn_discard_handshake_state(conn, ts); |
| 8630 | |
| 8631 | rv = conn_enqueue_handshake_done(conn); |
| 8632 | if (rv != 0) { |
| 8633 | return rv; |
| 8634 | } |
| 8635 | |
| 8636 | conn->pktns.rtb.persistent_congestion_start_ts = ts; |
| 8637 | |
| 8638 | /* Re-arm loss detection timer here after handshake has been |
| 8639 | confirmed. */ |
| 8640 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 8641 | |
| 8642 | return 0; |
| 8643 | case NGTCP2_CS_CLOSING: |
| 8644 | return NGTCP2_ERR_CLOSING-230; |
| 8645 | case NGTCP2_CS_DRAINING: |
| 8646 | return NGTCP2_ERR_DRAINING-231; |
| 8647 | default: |
| 8648 | return 0; |
| 8649 | } |
| 8650 | } |
| 8651 | |
| 8652 | int ngtcp2_conn_read_pkt(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 8653 | const ngtcp2_pkt_info *pi, const uint8_t *pkt, |
| 8654 | size_t pktlen, ngtcp2_tstamp ts) { |
| 8655 | int rv = 0; |
| 8656 | |
| 8657 | conn->log.last_ts = ts; |
| 8658 | conn->qlog.last_ts = ts; |
| 8659 | |
| 8660 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, "recv packet len=%zu", |
| 8661 | pktlen); |
| 8662 | |
| 8663 | if (pktlen == 0) { |
| 8664 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 8665 | } |
| 8666 | |
| 8667 | /* client does not expect a packet from unknown path. */ |
| 8668 | if (!conn->server && !ngtcp2_path_eq(&conn->dcid.current.ps.path, path) && |
| 8669 | (!conn->pv || !ngtcp2_path_eq(&conn->pv->dcid.ps.path, path)) && |
| 8670 | !conn_is_retired_path(conn, path)) { |
| 8671 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 8672 | "ignore packet from unknown path"); |
| 8673 | return 0; |
| 8674 | } |
| 8675 | |
| 8676 | switch (conn->state) { |
| 8677 | case NGTCP2_CS_CLIENT_INITIAL: |
| 8678 | case NGTCP2_CS_CLIENT_WAIT_HANDSHAKE: |
| 8679 | case NGTCP2_CS_CLIENT_TLS_HANDSHAKE_FAILED: |
| 8680 | return conn_read_handshake(conn, path, pi, pkt, pktlen, ts); |
| 8681 | case NGTCP2_CS_SERVER_INITIAL: |
| 8682 | case NGTCP2_CS_SERVER_WAIT_HANDSHAKE: |
| 8683 | case NGTCP2_CS_SERVER_TLS_HANDSHAKE_FAILED: |
| 8684 | if (!ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 8685 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 8686 | "ignore packet from unknown path during handshake"); |
| 8687 | |
| 8688 | if (conn->state == NGTCP2_CS_SERVER_INITIAL && |
| 8689 | ngtcp2_strm_rx_offset(&conn->in_pktns->crypto.strm) == 0 && |
| 8690 | (!conn->in_pktns->crypto.strm.rx.rob || |
| 8691 | !ngtcp2_rob_data_buffered(conn->in_pktns->crypto.strm.rx.rob))) { |
| 8692 | return NGTCP2_ERR_DROP_CONN-242; |
| 8693 | } |
| 8694 | |
| 8695 | return 0; |
| 8696 | } |
| 8697 | return conn_read_handshake(conn, path, pi, pkt, pktlen, ts); |
| 8698 | case NGTCP2_CS_CLOSING: |
| 8699 | return NGTCP2_ERR_CLOSING-230; |
| 8700 | case NGTCP2_CS_DRAINING: |
| 8701 | return NGTCP2_ERR_DRAINING-231; |
| 8702 | case NGTCP2_CS_POST_HANDSHAKE: |
| 8703 | rv = conn_prepare_key_update(conn, ts); |
| 8704 | if (rv != 0) { |
| 8705 | return rv; |
| 8706 | } |
| 8707 | return conn_recv_cpkt(conn, path, pi, pkt, pktlen, ts); |
| 8708 | default: |
| 8709 | assert(0)((void) (0)); |
| 8710 | abort(); |
| 8711 | } |
| 8712 | } |
| 8713 | |
| 8714 | /* |
| 8715 | * conn_check_pkt_num_exhausted returns nonzero if packet number is |
| 8716 | * exhausted in at least one of packet number space. |
| 8717 | */ |
| 8718 | static int conn_check_pkt_num_exhausted(ngtcp2_conn *conn) { |
| 8719 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 8720 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 8721 | |
| 8722 | return (in_pktns && in_pktns->tx.last_pkt_num == NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1))) || |
| 8723 | (hs_pktns && hs_pktns->tx.last_pkt_num == NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1))) || |
| 8724 | conn->pktns.tx.last_pkt_num == NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1)); |
| 8725 | } |
| 8726 | |
| 8727 | /* |
| 8728 | * conn_retransmit_retry_early retransmits 0RTT packet after Retry is |
| 8729 | * received from server. |
| 8730 | */ |
| 8731 | static ngtcp2_ssize conn_retransmit_retry_early(ngtcp2_conn *conn, |
| 8732 | ngtcp2_pkt_info *pi, |
| 8733 | uint8_t *dest, size_t destlen, |
| 8734 | ngtcp2_tstamp ts) { |
| 8735 | return conn_write_pkt(conn, pi, dest, destlen, NULL((void*)0), NGTCP2_PKT_0RTT, |
| 8736 | NGTCP2_WRITE_PKT_FLAG_NONE0x00, ts); |
| 8737 | } |
| 8738 | |
| 8739 | /* |
| 8740 | * conn_handshake_probe_left returns nonzero if there are probe |
| 8741 | * packets to be sent for Initial or Handshake packet number space |
| 8742 | * left. |
| 8743 | */ |
| 8744 | static int conn_handshake_probe_left(ngtcp2_conn *conn) { |
| 8745 | return (conn->in_pktns && conn->in_pktns->rtb.probe_pkt_left) || |
| 8746 | conn->hs_pktns->rtb.probe_pkt_left; |
| 8747 | } |
| 8748 | |
| 8749 | /* |
| 8750 | * conn_write_handshake writes QUIC handshake packets to the buffer |
| 8751 | * pointed by |dest| of length |destlen|. |early_datalen| specifies |
| 8752 | * the expected length of early data to send. Specify 0 to |
| 8753 | * |early_datalen| if there is no early data. |
| 8754 | * |
| 8755 | * This function returns the number of bytes written to the buffer, or |
| 8756 | * one of the following negative error codes: |
| 8757 | * |
| 8758 | * NGTCP2_ERR_PKT_NUM_EXHAUSTED |
| 8759 | * Packet number is exhausted. |
| 8760 | * NGTCP2_ERR_NOMEM |
| 8761 | * Out of memory |
| 8762 | * NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM |
| 8763 | * Required transport parameter is missing. |
| 8764 | * NGTCP2_CS_CLOSING |
| 8765 | * Connection is in closing state. |
| 8766 | * NGTCP2_CS_DRAINING |
| 8767 | * Connection is in draining state. |
| 8768 | * |
| 8769 | * In addition to the above negative error codes, the same error codes |
| 8770 | * from conn_recv_pkt may also be returned. |
| 8771 | */ |
| 8772 | static ngtcp2_ssize conn_write_handshake(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, |
| 8773 | uint8_t *dest, size_t destlen, |
| 8774 | size_t early_datalen, |
| 8775 | ngtcp2_tstamp ts) { |
| 8776 | int rv; |
| 8777 | ngtcp2_ssize res = 0, nwrite = 0, early_spktlen = 0; |
| 8778 | size_t origlen = destlen; |
| 8779 | size_t server_tx_left; |
| 8780 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 8781 | size_t pending_early_datalen; |
| 8782 | ngtcp2_dcid *dcid; |
| 8783 | ngtcp2_preferred_addr *paddr; |
| 8784 | |
| 8785 | switch (conn->state) { |
| 8786 | case NGTCP2_CS_CLIENT_INITIAL: |
| 8787 | pending_early_datalen = conn_retry_early_payloadlen(conn); |
| 8788 | if (pending_early_datalen) { |
| 8789 | early_datalen = pending_early_datalen; |
| 8790 | } |
| 8791 | |
| 8792 | if (!(conn->flags & NGTCP2_CONN_FLAG_RECV_RETRY0x10)) { |
| 8793 | nwrite = |
| 8794 | conn_write_client_initial(conn, pi, dest, destlen, early_datalen, ts); |
| 8795 | if (nwrite <= 0) { |
| 8796 | return nwrite; |
| 8797 | } |
| 8798 | } else { |
| 8799 | nwrite = conn_write_handshake_pkt( |
| 8800 | conn, pi, dest, destlen, NGTCP2_PKT_INITIAL, |
| 8801 | NGTCP2_WRITE_PKT_FLAG_NONE0x00, early_datalen, ts); |
| 8802 | if (nwrite < 0) { |
| 8803 | return nwrite; |
| 8804 | } |
| 8805 | } |
| 8806 | |
| 8807 | if (pending_early_datalen) { |
| 8808 | early_spktlen = conn_retransmit_retry_early(conn, pi, dest + nwrite, |
| 8809 | destlen - (size_t)nwrite, ts); |
| 8810 | |
| 8811 | if (early_spktlen < 0) { |
| 8812 | assert(ngtcp2_err_is_fatal((int)early_spktlen))((void) (0)); |
| 8813 | return early_spktlen; |
| 8814 | } |
| 8815 | } |
| 8816 | |
| 8817 | conn->state = NGTCP2_CS_CLIENT_WAIT_HANDSHAKE; |
| 8818 | |
| 8819 | res = nwrite + early_spktlen; |
| 8820 | |
| 8821 | return res; |
| 8822 | case NGTCP2_CS_CLIENT_WAIT_HANDSHAKE: |
| 8823 | if (!conn_handshake_probe_left(conn) && conn_cwnd_is_zero(conn)) { |
| 8824 | destlen = 0; |
| 8825 | } else { |
| 8826 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100)) { |
| 8827 | pending_early_datalen = conn_retry_early_payloadlen(conn); |
| 8828 | if (pending_early_datalen) { |
| 8829 | early_datalen = pending_early_datalen; |
| 8830 | } |
| 8831 | } |
| 8832 | |
| 8833 | nwrite = |
| 8834 | conn_write_handshake_pkts(conn, pi, dest, destlen, early_datalen, ts); |
| 8835 | if (nwrite < 0) { |
| 8836 | return nwrite; |
| 8837 | } |
| 8838 | |
| 8839 | res += nwrite; |
| 8840 | dest += nwrite; |
| 8841 | destlen -= (size_t)nwrite; |
| 8842 | } |
| 8843 | |
| 8844 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 8845 | if (!(conn->flags & NGTCP2_CONN_FLAG_EARLY_DATA_REJECTED0x20)) { |
| 8846 | nwrite = conn_retransmit_retry_early(conn, pi, dest, destlen, ts); |
| 8847 | if (nwrite < 0) { |
| 8848 | return nwrite; |
| 8849 | } |
| 8850 | |
| 8851 | res += nwrite; |
| 8852 | } |
| 8853 | |
| 8854 | if (res == 0) { |
| 8855 | nwrite = conn_write_handshake_ack_pkts(conn, pi, dest, origlen, ts); |
| 8856 | if (nwrite < 0) { |
| 8857 | return nwrite; |
| 8858 | } |
| 8859 | res = nwrite; |
| 8860 | } |
| 8861 | |
| 8862 | return res; |
| 8863 | } |
| 8864 | |
| 8865 | if (!(conn->flags & NGTCP2_CONN_FLAG_TRANSPORT_PARAM_RECVED0x04)) { |
| 8866 | return NGTCP2_ERR_REQUIRED_TRANSPORT_PARAM-217; |
| 8867 | } |
| 8868 | |
| 8869 | conn->state = NGTCP2_CS_POST_HANDSHAKE; |
| 8870 | |
| 8871 | if (conn->remote.transport_params.preferred_address_present) { |
| 8872 | assert(!ngtcp2_ringbuf_full(&conn->dcid.unused))((void) (0)); |
| 8873 | |
| 8874 | paddr = &conn->remote.transport_params.preferred_address; |
| 8875 | dcid = ngtcp2_ringbuf_push_back(&conn->dcid.unused); |
| 8876 | ngtcp2_dcid_init(dcid, 1, &paddr->cid, paddr->stateless_reset_token); |
| 8877 | |
| 8878 | rv = ngtcp2_gaptr_push(&conn->dcid.seqgap, 1, 1); |
| 8879 | if (rv != 0) { |
| 8880 | return (ngtcp2_ssize)rv; |
| 8881 | } |
| 8882 | } |
| 8883 | |
| 8884 | if (conn->remote.transport_params.stateless_reset_token_present) { |
| 8885 | assert(conn->dcid.current.seq == 0)((void) (0)); |
| 8886 | memcpy(conn->dcid.current.token, |
| 8887 | conn->remote.transport_params.stateless_reset_token, |
| 8888 | sizeof(conn->dcid.current.token)); |
| 8889 | } |
| 8890 | |
| 8891 | rv = conn_call_activate_dcid(conn, &conn->dcid.current); |
| 8892 | if (rv != 0) { |
| 8893 | return rv; |
| 8894 | } |
| 8895 | |
| 8896 | conn_process_early_rtb(conn); |
| 8897 | |
| 8898 | rv = conn_process_buffered_protected_pkt(conn, &conn->pktns, ts); |
| 8899 | if (rv != 0) { |
| 8900 | return (ngtcp2_ssize)rv; |
| 8901 | } |
| 8902 | |
| 8903 | return res; |
| 8904 | case NGTCP2_CS_SERVER_INITIAL: |
| 8905 | nwrite = conn_write_handshake_pkts(conn, pi, dest, destlen, |
| 8906 | /* early_datalen = */ 0, ts); |
| 8907 | if (nwrite < 0) { |
| 8908 | return nwrite; |
| 8909 | } |
| 8910 | |
| 8911 | if (nwrite) { |
| 8912 | conn->state = NGTCP2_CS_SERVER_WAIT_HANDSHAKE; |
| 8913 | } |
| 8914 | |
| 8915 | return nwrite; |
| 8916 | case NGTCP2_CS_SERVER_WAIT_HANDSHAKE: |
| 8917 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 8918 | if (!(conn->dcid.current.flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01)) { |
| 8919 | server_tx_left = conn_server_tx_left(conn, &conn->dcid.current); |
| 8920 | if (server_tx_left == 0) { |
| 8921 | if (cstat->loss_detection_timer != UINT64_MAX(18446744073709551615UL)) { |
| 8922 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 8923 | "loss detection timer canceled"); |
| 8924 | cstat->loss_detection_timer = UINT64_MAX(18446744073709551615UL); |
| 8925 | cstat->pto_count = 0; |
| 8926 | } |
| 8927 | return 0; |
| 8928 | } |
| 8929 | } |
| 8930 | |
| 8931 | if (conn_handshake_probe_left(conn) || !conn_cwnd_is_zero(conn)) { |
| 8932 | nwrite = conn_write_handshake_pkts(conn, pi, dest, destlen, |
| 8933 | /* early_datalen = */ 0, ts); |
| 8934 | if (nwrite < 0) { |
| 8935 | return nwrite; |
| 8936 | } |
| 8937 | |
| 8938 | res += nwrite; |
| 8939 | dest += nwrite; |
| 8940 | destlen -= (size_t)nwrite; |
| 8941 | } |
| 8942 | |
| 8943 | if (res == 0) { |
| 8944 | nwrite = conn_write_handshake_ack_pkts(conn, pi, dest, origlen, ts); |
| 8945 | if (nwrite < 0) { |
| 8946 | return nwrite; |
| 8947 | } |
| 8948 | |
| 8949 | res += nwrite; |
| 8950 | dest += nwrite; |
| 8951 | origlen -= (size_t)nwrite; |
| 8952 | } |
| 8953 | |
| 8954 | return res; |
| 8955 | } |
| 8956 | |
| 8957 | return 0; |
| 8958 | case NGTCP2_CS_CLOSING: |
| 8959 | return NGTCP2_ERR_CLOSING-230; |
| 8960 | case NGTCP2_CS_DRAINING: |
| 8961 | return NGTCP2_ERR_DRAINING-231; |
| 8962 | default: |
| 8963 | return 0; |
| 8964 | } |
| 8965 | } |
| 8966 | |
| 8967 | /** |
| 8968 | * @function |
| 8969 | * |
| 8970 | * `conn_client_write_handshake` writes client side handshake data and |
| 8971 | * 0RTT packet. |
| 8972 | * |
| 8973 | * In order to send STREAM data in 0RTT packet, specify |
| 8974 | * |vmsg|->stream. |vmsg|->stream.strm, |vmsg|->stream.fin, |
| 8975 | * |vmsg|->stream.data, and |vmsg|->stream.datacnt are stream to which |
| 8976 | * 0-RTT data is sent, whether it is a last data chunk in this stream, |
| 8977 | * a vector of 0-RTT data, and its number of elements respectively. |
| 8978 | * The amount of 0RTT data sent is assigned to |
| 8979 | * *|vmsg|->stream.pdatalen. If no data is sent, -1 is assigned. |
| 8980 | * Note that 0 length STREAM frame is allowed in QUIC, so 0 might be |
| 8981 | * assigned to *|vmsg|->stream.pdatalen. |
| 8982 | * |
| 8983 | * This function returns 0 if it cannot write any frame because buffer |
| 8984 | * is too small, or packet is congestion limited. Application should |
| 8985 | * keep reading and wait for congestion window to grow. |
| 8986 | * |
| 8987 | * This function returns the number of bytes written to the buffer |
| 8988 | * pointed by |dest| if it succeeds, or one of the following negative |
| 8989 | * error codes: (TBD). |
| 8990 | */ |
| 8991 | static ngtcp2_ssize conn_client_write_handshake(ngtcp2_conn *conn, |
| 8992 | ngtcp2_pkt_info *pi, |
| 8993 | uint8_t *dest, size_t destlen, |
| 8994 | ngtcp2_vmsg *vmsg, |
| 8995 | ngtcp2_tstamp ts) { |
| 8996 | int send_stream = 0; |
| 8997 | int send_datagram = 0; |
| 8998 | ngtcp2_ssize spktlen, early_spktlen; |
| 8999 | int was_client_initial; |
| 9000 | size_t datalen; |
| 9001 | size_t early_datalen = 0; |
| 9002 | uint8_t wflags = NGTCP2_WRITE_PKT_FLAG_NONE0x00; |
| 9003 | int ppe_pending = (conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING0x1000) != 0; |
| 9004 | |
| 9005 | assert(!conn->server)((void) (0)); |
| 9006 | |
| 9007 | /* conn->early.ckm might be created in the first call of |
| 9008 | conn_handshake(). Check it later. */ |
| 9009 | if (vmsg && !(conn->flags & NGTCP2_CONN_FLAG_EARLY_DATA_REJECTED0x20)) { |
| 9010 | switch (vmsg->type) { |
| 9011 | case NGTCP2_VMSG_TYPE_STREAM: |
| 9012 | datalen = ngtcp2_vec_len(vmsg->stream.data, vmsg->stream.datacnt); |
| 9013 | send_stream = |
| 9014 | conn_retry_early_payloadlen(conn) == 0 && |
| 9015 | /* 0 length STREAM frame is allowed */ |
| 9016 | (datalen == 0 || |
| 9017 | (datalen > 0 && |
| 9018 | (vmsg->stream.strm->tx.max_offset - vmsg->stream.strm->tx.offset) && |
| 9019 | (conn->tx.max_offset - conn->tx.offset))); |
| 9020 | if (send_stream) { |
| 9021 | early_datalen = |
| 9022 | conn_enforce_flow_control(conn, vmsg->stream.strm, datalen) + |
| 9023 | NGTCP2_STREAM_OVERHEAD(1 + 8 + 8 + 8); |
| 9024 | |
| 9025 | if (vmsg->stream.flags & NGTCP2_WRITE_STREAM_FLAG_MORE0x01) { |
| 9026 | wflags |= NGTCP2_WRITE_PKT_FLAG_MORE0x02; |
| 9027 | } |
| 9028 | } else { |
| 9029 | vmsg = NULL((void*)0); |
| 9030 | } |
| 9031 | break; |
| 9032 | case NGTCP2_VMSG_TYPE_DATAGRAM: |
| 9033 | datalen = ngtcp2_vec_len(vmsg->datagram.data, vmsg->datagram.datacnt); |
| 9034 | /* TODO Do we need this? DATAGRAM is independent from STREAM |
| 9035 | data and no retransmission */ |
| 9036 | send_datagram = conn_retry_early_payloadlen(conn) == 0; |
| 9037 | if (send_datagram) { |
| 9038 | early_datalen = datalen + NGTCP2_DATAGRAM_OVERHEAD(1 + 8); |
| 9039 | |
| 9040 | if (vmsg->datagram.flags & NGTCP2_WRITE_DATAGRAM_FLAG_MORE0x01) { |
| 9041 | wflags |= NGTCP2_WRITE_PKT_FLAG_MORE0x02; |
| 9042 | } |
| 9043 | } else { |
| 9044 | vmsg = NULL((void*)0); |
| 9045 | } |
| 9046 | break; |
| 9047 | } |
| 9048 | } |
| 9049 | |
| 9050 | if (!ppe_pending) { |
| 9051 | was_client_initial = conn->state == NGTCP2_CS_CLIENT_INITIAL; |
| 9052 | spktlen = conn_write_handshake(conn, pi, dest, destlen, early_datalen, ts); |
| 9053 | |
| 9054 | if (spktlen < 0) { |
| 9055 | return spktlen; |
| 9056 | } |
| 9057 | |
| 9058 | if (conn->pktns.crypto.tx.ckm || !conn->early.ckm || |
| 9059 | (!send_stream && !send_datagram)) { |
| 9060 | return spktlen; |
| 9061 | } |
| 9062 | } else { |
| 9063 | assert(!conn->pktns.crypto.tx.ckm)((void) (0)); |
| 9064 | assert(conn->early.ckm)((void) (0)); |
| 9065 | |
| 9066 | was_client_initial = conn->pkt.was_client_initial; |
| 9067 | spktlen = conn->pkt.hs_spktlen; |
| 9068 | } |
| 9069 | |
| 9070 | /* If spktlen > 0, we are making a compound packet. If Initial |
| 9071 | packet is written, we have to pad bytes to 0-RTT packet. */ |
| 9072 | |
| 9073 | if (spktlen && was_client_initial) { |
| 9074 | wflags |= NGTCP2_WRITE_PKT_FLAG_REQUIRE_PADDING0x01; |
| 9075 | } |
| 9076 | |
| 9077 | dest += spktlen; |
| 9078 | destlen -= (size_t)spktlen; |
| 9079 | |
| 9080 | if (conn_cwnd_is_zero(conn)) { |
| 9081 | return spktlen; |
| 9082 | } |
| 9083 | |
| 9084 | early_spktlen = conn_write_pkt(conn, pi, dest, destlen, vmsg, NGTCP2_PKT_0RTT, |
| 9085 | wflags, ts); |
| 9086 | |
| 9087 | if (early_spktlen < 0) { |
| 9088 | switch (early_spktlen) { |
| 9089 | case NGTCP2_ERR_STREAM_DATA_BLOCKED-210: |
| 9090 | return spktlen; |
| 9091 | case NGTCP2_ERR_WRITE_MORE-240: |
| 9092 | conn->pkt.was_client_initial = was_client_initial; |
| 9093 | conn->pkt.hs_spktlen = spktlen; |
| 9094 | break; |
| 9095 | } |
| 9096 | return early_spktlen; |
| 9097 | } |
| 9098 | |
| 9099 | return spktlen + early_spktlen; |
| 9100 | } |
| 9101 | |
| 9102 | void ngtcp2_conn_handshake_completed(ngtcp2_conn *conn) { |
| 9103 | conn->flags |= NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01; |
| 9104 | if (conn->server) { |
| 9105 | conn->flags |= NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80; |
| 9106 | } |
| 9107 | } |
| 9108 | |
| 9109 | int ngtcp2_conn_get_handshake_completed(ngtcp2_conn *conn) { |
| 9110 | return (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) && |
| 9111 | (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100); |
| 9112 | } |
| 9113 | |
| 9114 | int ngtcp2_conn_sched_ack(ngtcp2_conn *conn, ngtcp2_acktr *acktr, |
| 9115 | int64_t pkt_num, int active_ack, ngtcp2_tstamp ts) { |
| 9116 | int rv; |
| 9117 | (void)conn; |
| 9118 | |
| 9119 | rv = ngtcp2_acktr_add(acktr, pkt_num, active_ack, ts); |
| 9120 | if (rv != 0) { |
| 9121 | assert(rv != NGTCP2_ERR_INVALID_ARGUMENT)((void) (0)); |
| 9122 | return rv; |
| 9123 | } |
| 9124 | |
| 9125 | return 0; |
| 9126 | } |
| 9127 | |
| 9128 | int ngtcp2_accept(ngtcp2_pkt_hd *dest, const uint8_t *pkt, size_t pktlen) { |
| 9129 | ngtcp2_ssize nread; |
| 9130 | ngtcp2_pkt_hd hd, *p; |
| 9131 | |
| 9132 | if (dest) { |
| 9133 | p = dest; |
| 9134 | } else { |
| 9135 | p = &hd; |
| 9136 | } |
| 9137 | |
| 9138 | if (pktlen == 0 || (pkt[0] & NGTCP2_HEADER_FORM_BIT0x80) == 0) { |
| 9139 | return -1; |
| 9140 | } |
| 9141 | |
| 9142 | nread = ngtcp2_pkt_decode_hd_long(p, pkt, pktlen); |
| 9143 | if (nread < 0) { |
| 9144 | return -1; |
| 9145 | } |
| 9146 | |
| 9147 | switch (p->type) { |
| 9148 | case NGTCP2_PKT_INITIAL: |
| 9149 | if (pktlen < NGTCP2_MIN_INITIAL_PKTLEN1200) { |
| 9150 | return -1; |
| 9151 | } |
| 9152 | if (p->token.len == 0 && p->dcid.datalen < NGTCP2_MIN_INITIAL_DCIDLEN8) { |
| 9153 | return -1; |
| 9154 | } |
| 9155 | break; |
| 9156 | case NGTCP2_PKT_0RTT: |
| 9157 | /* 0-RTT packet may arrive before Initial packet due to |
| 9158 | re-ordering. */ |
| 9159 | break; |
| 9160 | default: |
| 9161 | return -1; |
| 9162 | } |
| 9163 | |
| 9164 | if (p->version != NGTCP2_PROTO_VER_V10x00000001u && |
| 9165 | (p->version < NGTCP2_PROTO_VER_DRAFT_MIN0xff00001du || |
| 9166 | NGTCP2_PROTO_VER_DRAFT_MAX0xff000020u < p->version)) { |
| 9167 | return 1; |
| 9168 | } |
| 9169 | |
| 9170 | return 0; |
| 9171 | } |
| 9172 | |
| 9173 | int ngtcp2_conn_install_initial_key( |
| 9174 | ngtcp2_conn *conn, const ngtcp2_crypto_aead_ctx *rx_aead_ctx, |
| 9175 | const uint8_t *rx_iv, const ngtcp2_crypto_cipher_ctx *rx_hp_ctx, |
| 9176 | const ngtcp2_crypto_aead_ctx *tx_aead_ctx, const uint8_t *tx_iv, |
| 9177 | const ngtcp2_crypto_cipher_ctx *tx_hp_ctx, size_t ivlen) { |
| 9178 | ngtcp2_pktns *pktns = conn->in_pktns; |
| 9179 | int rv; |
| 9180 | |
| 9181 | assert(pktns)((void) (0)); |
| 9182 | |
| 9183 | conn_call_delete_crypto_cipher_ctx(conn, &pktns->crypto.rx.hp_ctx); |
| 9184 | pktns->crypto.rx.hp_ctx.native_handle = NULL((void*)0); |
| 9185 | |
| 9186 | if (pktns->crypto.rx.ckm) { |
| 9187 | conn_call_delete_crypto_aead_ctx(conn, &pktns->crypto.rx.ckm->aead_ctx); |
| 9188 | ngtcp2_crypto_km_del(pktns->crypto.rx.ckm, conn->mem); |
| 9189 | pktns->crypto.rx.ckm = NULL((void*)0); |
| 9190 | } |
| 9191 | |
| 9192 | conn_call_delete_crypto_cipher_ctx(conn, &pktns->crypto.tx.hp_ctx); |
| 9193 | pktns->crypto.tx.hp_ctx.native_handle = NULL((void*)0); |
| 9194 | |
| 9195 | if (pktns->crypto.tx.ckm) { |
| 9196 | conn_call_delete_crypto_aead_ctx(conn, &pktns->crypto.tx.ckm->aead_ctx); |
| 9197 | ngtcp2_crypto_km_del(pktns->crypto.tx.ckm, conn->mem); |
| 9198 | pktns->crypto.tx.ckm = NULL((void*)0); |
| 9199 | } |
| 9200 | |
| 9201 | rv = ngtcp2_crypto_km_new(&pktns->crypto.rx.ckm, NULL((void*)0), 0, NULL((void*)0), rx_iv, ivlen, |
| 9202 | conn->mem); |
| 9203 | if (rv != 0) { |
| 9204 | return rv; |
| 9205 | } |
| 9206 | |
| 9207 | rv = ngtcp2_crypto_km_new(&pktns->crypto.tx.ckm, NULL((void*)0), 0, NULL((void*)0), tx_iv, ivlen, |
| 9208 | conn->mem); |
| 9209 | if (rv != 0) { |
| 9210 | return rv; |
| 9211 | } |
| 9212 | |
| 9213 | /* Take owner ship after we are sure that no failure occurs, so that |
| 9214 | caller can delete these contexts on failure. */ |
| 9215 | pktns->crypto.rx.ckm->aead_ctx = *rx_aead_ctx; |
| 9216 | pktns->crypto.rx.hp_ctx = *rx_hp_ctx; |
| 9217 | pktns->crypto.tx.ckm->aead_ctx = *tx_aead_ctx; |
| 9218 | pktns->crypto.tx.hp_ctx = *tx_hp_ctx; |
| 9219 | |
| 9220 | return 0; |
| 9221 | } |
| 9222 | |
| 9223 | int ngtcp2_conn_install_rx_handshake_key( |
| 9224 | ngtcp2_conn *conn, const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 9225 | const uint8_t *iv, size_t ivlen, const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 9226 | ngtcp2_pktns *pktns = conn->hs_pktns; |
| 9227 | int rv; |
| 9228 | |
| 9229 | assert(pktns)((void) (0)); |
| 9230 | assert(!pktns->crypto.rx.hp_ctx.native_handle)((void) (0)); |
| 9231 | assert(!pktns->crypto.rx.ckm)((void) (0)); |
| 9232 | |
| 9233 | rv = ngtcp2_crypto_km_new(&pktns->crypto.rx.ckm, NULL((void*)0), 0, aead_ctx, iv, ivlen, |
| 9234 | conn->mem); |
| 9235 | if (rv != 0) { |
| 9236 | return rv; |
| 9237 | } |
| 9238 | |
| 9239 | pktns->crypto.rx.hp_ctx = *hp_ctx; |
| 9240 | |
| 9241 | return 0; |
| 9242 | } |
| 9243 | |
| 9244 | int ngtcp2_conn_install_tx_handshake_key( |
| 9245 | ngtcp2_conn *conn, const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 9246 | const uint8_t *iv, size_t ivlen, const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 9247 | ngtcp2_pktns *pktns = conn->hs_pktns; |
| 9248 | int rv; |
| 9249 | |
| 9250 | assert(pktns)((void) (0)); |
| 9251 | assert(!pktns->crypto.tx.hp_ctx.native_handle)((void) (0)); |
| 9252 | assert(!pktns->crypto.tx.ckm)((void) (0)); |
| 9253 | |
| 9254 | rv = ngtcp2_crypto_km_new(&pktns->crypto.tx.ckm, NULL((void*)0), 0, aead_ctx, iv, ivlen, |
| 9255 | conn->mem); |
| 9256 | if (rv != 0) { |
| 9257 | return rv; |
| 9258 | } |
| 9259 | |
| 9260 | pktns->crypto.tx.hp_ctx = *hp_ctx; |
| 9261 | |
| 9262 | if (conn->server) { |
| 9263 | return ngtcp2_conn_commit_local_transport_params(conn); |
| 9264 | } |
| 9265 | |
| 9266 | return 0; |
| 9267 | } |
| 9268 | |
| 9269 | int ngtcp2_conn_install_early_key(ngtcp2_conn *conn, |
| 9270 | const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 9271 | const uint8_t *iv, size_t ivlen, |
| 9272 | const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 9273 | int rv; |
| 9274 | |
| 9275 | assert(!conn->early.hp_ctx.native_handle)((void) (0)); |
| 9276 | assert(!conn->early.ckm)((void) (0)); |
| 9277 | |
| 9278 | rv = ngtcp2_crypto_km_new(&conn->early.ckm, NULL((void*)0), 0, aead_ctx, iv, ivlen, |
| 9279 | conn->mem); |
| 9280 | if (rv != 0) { |
| 9281 | return rv; |
| 9282 | } |
| 9283 | |
| 9284 | conn->early.hp_ctx = *hp_ctx; |
| 9285 | |
| 9286 | return 0; |
| 9287 | } |
| 9288 | |
| 9289 | int ngtcp2_conn_install_rx_key(ngtcp2_conn *conn, const uint8_t *secret, |
| 9290 | size_t secretlen, |
| 9291 | const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 9292 | const uint8_t *iv, size_t ivlen, |
| 9293 | const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 9294 | ngtcp2_pktns *pktns = &conn->pktns; |
| 9295 | int rv; |
| 9296 | |
| 9297 | assert(!pktns->crypto.rx.hp_ctx.native_handle)((void) (0)); |
| 9298 | assert(!pktns->crypto.rx.ckm)((void) (0)); |
| 9299 | |
| 9300 | rv = ngtcp2_crypto_km_new(&pktns->crypto.rx.ckm, secret, secretlen, aead_ctx, |
| 9301 | iv, ivlen, conn->mem); |
| 9302 | if (rv != 0) { |
| 9303 | return rv; |
| 9304 | } |
| 9305 | |
| 9306 | pktns->crypto.rx.hp_ctx = *hp_ctx; |
| 9307 | |
| 9308 | if (!conn->server) { |
| 9309 | conn->remote.transport_params = conn->remote.pending_transport_params; |
| 9310 | conn_sync_stream_id_limit(conn); |
| 9311 | conn->tx.max_offset = conn->remote.transport_params.initial_max_data; |
| 9312 | } |
| 9313 | |
| 9314 | return 0; |
| 9315 | } |
| 9316 | |
| 9317 | int ngtcp2_conn_install_tx_key(ngtcp2_conn *conn, const uint8_t *secret, |
| 9318 | size_t secretlen, |
| 9319 | const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 9320 | const uint8_t *iv, size_t ivlen, |
| 9321 | const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 9322 | ngtcp2_pktns *pktns = &conn->pktns; |
| 9323 | int rv; |
| 9324 | |
| 9325 | assert(!pktns->crypto.tx.hp_ctx.native_handle)((void) (0)); |
| 9326 | assert(!pktns->crypto.tx.ckm)((void) (0)); |
| 9327 | |
| 9328 | rv = ngtcp2_crypto_km_new(&pktns->crypto.tx.ckm, secret, secretlen, aead_ctx, |
| 9329 | iv, ivlen, conn->mem); |
| 9330 | if (rv != 0) { |
| 9331 | return rv; |
| 9332 | } |
| 9333 | |
| 9334 | pktns->crypto.tx.hp_ctx = *hp_ctx; |
| 9335 | |
| 9336 | if (conn->server) { |
| 9337 | conn->remote.transport_params = conn->remote.pending_transport_params; |
| 9338 | conn_sync_stream_id_limit(conn); |
| 9339 | conn->tx.max_offset = conn->remote.transport_params.initial_max_data; |
| 9340 | } else if (conn->early.ckm) { |
| 9341 | conn_discard_early_key(conn); |
| 9342 | } |
| 9343 | |
| 9344 | return 0; |
| 9345 | } |
| 9346 | |
| 9347 | int ngtcp2_conn_initiate_key_update(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 9348 | ngtcp2_tstamp confirmed_ts = conn->crypto.key_update.confirmed_ts; |
| 9349 | ngtcp2_duration pto = conn_compute_pto(conn, &conn->pktns); |
| 9350 | |
| 9351 | assert(conn->state == NGTCP2_CS_POST_HANDSHAKE)((void) (0)); |
| 9352 | |
| 9353 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80) || |
| 9354 | (conn->flags & NGTCP2_CONN_FLAG_KEY_UPDATE_NOT_CONFIRMED0x0800) || |
| 9355 | !conn->crypto.key_update.new_tx_ckm || |
| 9356 | !conn->crypto.key_update.new_rx_ckm || |
| 9357 | (confirmed_ts != UINT64_MAX(18446744073709551615UL) && confirmed_ts + 3 * pto > ts)) { |
| 9358 | return NGTCP2_ERR_INVALID_STATE-206; |
| 9359 | } |
| 9360 | |
| 9361 | conn_rotate_keys(conn, NGTCP2_MAX_PKT_NUM((int64_t)((1ll << 62) - 1))); |
| 9362 | |
| 9363 | return 0; |
| 9364 | } |
| 9365 | |
| 9366 | ngtcp2_tstamp ngtcp2_conn_loss_detection_expiry(ngtcp2_conn *conn) { |
| 9367 | return conn->cstat.loss_detection_timer; |
| 9368 | } |
| 9369 | |
| 9370 | ngtcp2_tstamp ngtcp2_conn_internal_expiry(ngtcp2_conn *conn) { |
| 9371 | ngtcp2_tstamp res = UINT64_MAX(18446744073709551615UL), t; |
| 9372 | ngtcp2_duration pto = conn_compute_pto(conn, &conn->pktns); |
| 9373 | ngtcp2_scid *scid; |
| 9374 | ngtcp2_dcid *dcid; |
| 9375 | |
| 9376 | if (conn->pv) { |
| 9377 | res = ngtcp2_pv_next_expiry(conn->pv); |
| 9378 | } |
| 9379 | |
| 9380 | if (!ngtcp2_pq_empty(&conn->scid.used)) { |
| 9381 | scid = ngtcp2_struct_of(ngtcp2_pq_top(&conn->scid.used), ngtcp2_scid, pe)((ngtcp2_scid *)(void *)((char *)(ngtcp2_pq_top(&conn-> scid.used))-__builtin_offsetof(ngtcp2_scid, pe))); |
| 9382 | if (scid->ts_retired != UINT64_MAX(18446744073709551615UL)) { |
| 9383 | res = ngtcp2_min(res, scid->ts_retired + pto)((res) < (scid->ts_retired + pto) ? (res) : (scid->ts_retired + pto)); |
| 9384 | } |
| 9385 | } |
| 9386 | |
| 9387 | if (ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len)) { |
| 9388 | dcid = ngtcp2_ringbuf_get(&conn->dcid.retired, 0); |
| 9389 | res = ngtcp2_min(res, dcid->ts_retired + pto)((res) < (dcid->ts_retired + pto) ? (res) : (dcid->ts_retired + pto)); |
| 9390 | } |
| 9391 | |
| 9392 | if (conn->server && conn->early.ckm && |
| 9393 | conn->early.discard_started_ts != UINT64_MAX(18446744073709551615UL)) { |
| 9394 | t = conn->early.discard_started_ts + 3 * pto; |
| 9395 | res = ngtcp2_min(res, t)((res) < (t) ? (res) : (t)); |
| 9396 | } |
| 9397 | |
| 9398 | return res; |
| 9399 | } |
| 9400 | |
| 9401 | ngtcp2_tstamp ngtcp2_conn_ack_delay_expiry(ngtcp2_conn *conn) { |
| 9402 | ngtcp2_acktr *acktr = &conn->pktns.acktr; |
| 9403 | |
| 9404 | if (!(acktr->flags & NGTCP2_ACKTR_FLAG_CANCEL_TIMER0x0100) && |
| 9405 | acktr->first_unacked_ts != UINT64_MAX(18446744073709551615UL)) { |
| 9406 | return acktr->first_unacked_ts + conn_compute_ack_delay(conn); |
| 9407 | } |
| 9408 | return UINT64_MAX(18446744073709551615UL); |
| 9409 | } |
| 9410 | |
| 9411 | ngtcp2_tstamp ngtcp2_conn_get_expiry(ngtcp2_conn *conn) { |
| 9412 | ngtcp2_tstamp t1 = ngtcp2_conn_loss_detection_expiry(conn); |
| 9413 | ngtcp2_tstamp t2 = ngtcp2_conn_ack_delay_expiry(conn); |
| 9414 | ngtcp2_tstamp t3 = ngtcp2_conn_internal_expiry(conn); |
| 9415 | ngtcp2_tstamp t4 = ngtcp2_conn_lost_pkt_expiry(conn); |
| 9416 | ngtcp2_tstamp res = ngtcp2_min(t1, t2)((t1) < (t2) ? (t1) : (t2)); |
| 9417 | res = ngtcp2_min(res, t3)((res) < (t3) ? (res) : (t3)); |
| 9418 | return ngtcp2_min(res, t4)((res) < (t4) ? (res) : (t4)); |
| 9419 | } |
| 9420 | |
| 9421 | int ngtcp2_conn_handle_expiry(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 9422 | int rv; |
| 9423 | ngtcp2_duration pto = conn_compute_pto(conn, &conn->pktns); |
| 9424 | |
| 9425 | ngtcp2_conn_cancel_expired_ack_delay_timer(conn, ts); |
| 9426 | |
| 9427 | ngtcp2_conn_remove_lost_pkt(conn, ts); |
| 9428 | |
| 9429 | if (conn->pv) { |
| 9430 | ngtcp2_pv_cancel_expired_timer(conn->pv, ts); |
| 9431 | } |
| 9432 | |
| 9433 | if (ngtcp2_conn_loss_detection_expiry(conn) <= ts) { |
| 9434 | rv = ngtcp2_conn_on_loss_detection_timer(conn, ts); |
| 9435 | if (rv != 0) { |
| 9436 | return rv; |
| 9437 | } |
| 9438 | } |
| 9439 | |
| 9440 | rv = conn_remove_retired_connection_id(conn, pto, ts); |
| 9441 | if (rv != 0) { |
| 9442 | return rv; |
| 9443 | } |
| 9444 | |
| 9445 | if (conn->server && conn->early.ckm && |
| 9446 | conn->early.discard_started_ts != UINT64_MAX(18446744073709551615UL)) { |
| 9447 | if (conn->early.discard_started_ts + 3 * pto <= ts) { |
| 9448 | conn_discard_early_key(conn); |
| 9449 | } |
| 9450 | } |
| 9451 | |
| 9452 | return 0; |
| 9453 | } |
| 9454 | |
| 9455 | static void acktr_cancel_expired_ack_delay_timer(ngtcp2_acktr *acktr, |
| 9456 | ngtcp2_tstamp ts) { |
| 9457 | if (!(acktr->flags & NGTCP2_ACKTR_FLAG_CANCEL_TIMER0x0100) && |
| 9458 | acktr->first_unacked_ts <= ts) { |
| 9459 | acktr->flags |= NGTCP2_ACKTR_FLAG_CANCEL_TIMER0x0100; |
| 9460 | } |
| 9461 | } |
| 9462 | |
| 9463 | void ngtcp2_conn_cancel_expired_ack_delay_timer(ngtcp2_conn *conn, |
| 9464 | ngtcp2_tstamp ts) { |
| 9465 | if (conn->in_pktns) { |
| 9466 | acktr_cancel_expired_ack_delay_timer(&conn->in_pktns->acktr, ts); |
| 9467 | } |
| 9468 | if (conn->hs_pktns) { |
| 9469 | acktr_cancel_expired_ack_delay_timer(&conn->hs_pktns->acktr, ts); |
| 9470 | } |
| 9471 | acktr_cancel_expired_ack_delay_timer(&conn->pktns.acktr, ts); |
| 9472 | } |
| 9473 | |
| 9474 | ngtcp2_tstamp ngtcp2_conn_lost_pkt_expiry(ngtcp2_conn *conn) { |
| 9475 | ngtcp2_tstamp res = UINT64_MAX(18446744073709551615UL), ts; |
| 9476 | |
| 9477 | if (conn->in_pktns) { |
| 9478 | ts = ngtcp2_rtb_lost_pkt_ts(&conn->in_pktns->rtb); |
| 9479 | if (ts != UINT64_MAX(18446744073709551615UL)) { |
| 9480 | ts += conn_compute_pto(conn, conn->in_pktns); |
| 9481 | res = ngtcp2_min(res, ts)((res) < (ts) ? (res) : (ts)); |
| 9482 | } |
| 9483 | } |
| 9484 | |
| 9485 | if (conn->hs_pktns) { |
| 9486 | ts = ngtcp2_rtb_lost_pkt_ts(&conn->hs_pktns->rtb); |
| 9487 | if (ts != UINT64_MAX(18446744073709551615UL)) { |
| 9488 | ts += conn_compute_pto(conn, conn->hs_pktns); |
| 9489 | res = ngtcp2_min(res, ts)((res) < (ts) ? (res) : (ts)); |
| 9490 | } |
| 9491 | } |
| 9492 | |
| 9493 | ts = ngtcp2_rtb_lost_pkt_ts(&conn->pktns.rtb); |
| 9494 | if (ts != UINT64_MAX(18446744073709551615UL)) { |
| 9495 | ts += conn_compute_pto(conn, &conn->pktns); |
| 9496 | res = ngtcp2_min(res, ts)((res) < (ts) ? (res) : (ts)); |
| 9497 | } |
| 9498 | |
| 9499 | return res; |
| 9500 | } |
| 9501 | |
| 9502 | void ngtcp2_conn_remove_lost_pkt(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 9503 | ngtcp2_duration pto; |
| 9504 | |
| 9505 | if (conn->in_pktns) { |
| 9506 | pto = conn_compute_pto(conn, conn->in_pktns); |
| 9507 | ngtcp2_rtb_remove_expired_lost_pkt(&conn->in_pktns->rtb, pto, ts); |
| 9508 | } |
| 9509 | if (conn->hs_pktns) { |
| 9510 | pto = conn_compute_pto(conn, conn->hs_pktns); |
| 9511 | ngtcp2_rtb_remove_expired_lost_pkt(&conn->hs_pktns->rtb, pto, ts); |
| 9512 | } |
| 9513 | pto = conn_compute_pto(conn, &conn->pktns); |
| 9514 | ngtcp2_rtb_remove_expired_lost_pkt(&conn->pktns.rtb, pto, ts); |
| 9515 | } |
| 9516 | |
| 9517 | /* |
| 9518 | * conn_client_validate_transport_params validates |params| as client. |
| 9519 | * |params| must be sent with Encrypted Extensions. |
| 9520 | * |
| 9521 | * This function returns 0 if it succeeds, or one of the following |
| 9522 | * negative error codes: |
| 9523 | * |
| 9524 | * NGTCP2_ERR_PROTO |
| 9525 | * Validation against either of original_dcid and retry_scid is |
| 9526 | * failed. |
| 9527 | * NGTCP2_ERR_TRANSPORT_PARAM |
| 9528 | * params contains preferred address but server chose zero-length |
| 9529 | * connection ID. |
| 9530 | */ |
| 9531 | static int |
| 9532 | conn_client_validate_transport_params(ngtcp2_conn *conn, |
| 9533 | const ngtcp2_transport_params *params) { |
| 9534 | if (!ngtcp2_cid_eq(&conn->rcid, ¶ms->original_dcid)) { |
| 9535 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9536 | } |
| 9537 | |
| 9538 | if (conn->flags & NGTCP2_CONN_FLAG_RECV_RETRY0x10) { |
| 9539 | if (!params->retry_scid_present) { |
| 9540 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9541 | } |
| 9542 | if (!ngtcp2_cid_eq(&conn->retry_scid, ¶ms->retry_scid)) { |
| 9543 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9544 | } |
| 9545 | } else if (params->retry_scid_present) { |
| 9546 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9547 | } |
| 9548 | |
| 9549 | if (params->preferred_address_present && |
| 9550 | conn->dcid.current.cid.datalen == 0) { |
| 9551 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9552 | } |
| 9553 | |
| 9554 | return 0; |
| 9555 | } |
| 9556 | |
| 9557 | int ngtcp2_conn_set_remote_transport_params( |
| 9558 | ngtcp2_conn *conn, const ngtcp2_transport_params *params) { |
| 9559 | int rv; |
| 9560 | |
| 9561 | assert(!(conn->flags & NGTCP2_CONN_FLAG_TRANSPORT_PARAM_RECVED))((void) (0)); |
| 9562 | |
| 9563 | /* Assume that ngtcp2_decode_transport_params sets default value if |
| 9564 | active_connection_id_limit is omitted. */ |
| 9565 | if (params->active_connection_id_limit < |
| 9566 | NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT2) { |
| 9567 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9568 | } |
| 9569 | |
| 9570 | /* We assume that conn->dcid.current.cid is still the initial one. |
| 9571 | This requires that transport parameter must be fed into |
| 9572 | ngtcp2_conn as early as possible. */ |
| 9573 | if (!ngtcp2_cid_eq(&conn->dcid.current.cid, ¶ms->initial_scid)) { |
| 9574 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9575 | } |
| 9576 | |
| 9577 | if (params->max_udp_payload_size < 1200) { |
| 9578 | return NGTCP2_ERR_TRANSPORT_PARAM-234; |
| 9579 | } |
| 9580 | |
| 9581 | if (!conn->server) { |
| 9582 | rv = conn_client_validate_transport_params(conn, params); |
| 9583 | if (rv != 0) { |
| 9584 | return rv; |
| 9585 | } |
| 9586 | } |
| 9587 | |
| 9588 | ngtcp2_log_remote_tp(&conn->log, |
| 9589 | conn->server |
| 9590 | ? NGTCP2_TRANSPORT_PARAMS_TYPE_CLIENT_HELLO |
| 9591 | : NGTCP2_TRANSPORT_PARAMS_TYPE_ENCRYPTED_EXTENSIONS, |
| 9592 | params); |
| 9593 | |
| 9594 | ngtcp2_qlog_parameters_set_transport_params(&conn->qlog, params, conn->server, |
| 9595 | NGTCP2_QLOG_SIDE_REMOTE); |
| 9596 | |
| 9597 | if ((conn->server && conn->pktns.crypto.tx.ckm) || |
| 9598 | (!conn->server && conn->pktns.crypto.rx.ckm)) { |
| 9599 | conn->remote.transport_params = *params; |
| 9600 | conn_sync_stream_id_limit(conn); |
| 9601 | conn->tx.max_offset = conn->remote.transport_params.initial_max_data; |
| 9602 | } else { |
| 9603 | conn->remote.pending_transport_params = *params; |
| 9604 | } |
| 9605 | |
| 9606 | conn->flags |= NGTCP2_CONN_FLAG_TRANSPORT_PARAM_RECVED0x04; |
| 9607 | |
| 9608 | return 0; |
| 9609 | } |
| 9610 | |
| 9611 | void ngtcp2_conn_get_remote_transport_params(ngtcp2_conn *conn, |
| 9612 | ngtcp2_transport_params *params) { |
| 9613 | if (conn->pktns.crypto.rx.ckm) { |
| 9614 | *params = conn->remote.transport_params; |
| 9615 | } else { |
| 9616 | *params = conn->remote.pending_transport_params; |
| 9617 | } |
| 9618 | } |
| 9619 | |
| 9620 | void ngtcp2_conn_set_early_remote_transport_params( |
| 9621 | ngtcp2_conn *conn, const ngtcp2_transport_params *params) { |
| 9622 | ngtcp2_transport_params *p = &conn->remote.transport_params; |
| 9623 | |
| 9624 | assert(!conn->server)((void) (0)); |
| 9625 | |
| 9626 | memset(p, 0, sizeof(*p)); |
| 9627 | |
| 9628 | p->initial_max_streams_bidi = params->initial_max_streams_bidi; |
| 9629 | p->initial_max_streams_uni = params->initial_max_streams_uni; |
| 9630 | p->initial_max_stream_data_bidi_local = |
| 9631 | params->initial_max_stream_data_bidi_local; |
| 9632 | p->initial_max_stream_data_bidi_remote = |
| 9633 | params->initial_max_stream_data_bidi_remote; |
| 9634 | p->initial_max_stream_data_uni = params->initial_max_stream_data_uni; |
| 9635 | p->initial_max_data = params->initial_max_data; |
| 9636 | p->max_datagram_frame_size = params->max_datagram_frame_size; |
| 9637 | |
| 9638 | conn_sync_stream_id_limit(conn); |
| 9639 | |
| 9640 | conn->tx.max_offset = p->initial_max_data; |
| 9641 | |
| 9642 | ngtcp2_qlog_parameters_set_transport_params(&conn->qlog, p, conn->server, |
| 9643 | NGTCP2_QLOG_SIDE_REMOTE); |
| 9644 | } |
| 9645 | |
| 9646 | int ngtcp2_conn_set_local_transport_params( |
| 9647 | ngtcp2_conn *conn, const ngtcp2_transport_params *params) { |
| 9648 | assert(conn->server)((void) (0)); |
| 9649 | assert(params->active_connection_id_limit <= NGTCP2_MAX_DCID_POOL_SIZE)((void) (0)); |
| 9650 | |
| 9651 | if (conn->hs_pktns == NULL((void*)0) || conn->hs_pktns->crypto.tx.ckm) { |
| 9652 | return NGTCP2_ERR_INVALID_STATE-206; |
| 9653 | } |
| 9654 | |
| 9655 | conn->local.transport_params = *params; |
| 9656 | |
| 9657 | return 0; |
| 9658 | } |
| 9659 | |
| 9660 | int ngtcp2_conn_commit_local_transport_params(ngtcp2_conn *conn) { |
| 9661 | const ngtcp2_mem *mem = conn->mem; |
| 9662 | ngtcp2_transport_params *params = &conn->local.transport_params; |
| 9663 | ngtcp2_scid *scident; |
| 9664 | ngtcp2_ksl_it it; |
| 9665 | int rv; |
| 9666 | |
| 9667 | assert(1 == ngtcp2_ksl_len(&conn->scid.set))((void) (0)); |
| 9668 | |
| 9669 | if (params->active_connection_id_limit == 0) { |
| 9670 | params->active_connection_id_limit = |
| 9671 | NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT2; |
| 9672 | } |
| 9673 | |
| 9674 | params->initial_scid = conn->oscid; |
| 9675 | |
| 9676 | if (conn->oscid.datalen == 0) { |
| 9677 | params->preferred_address_present = 0; |
| 9678 | } |
| 9679 | |
| 9680 | if (conn->server) { |
| 9681 | if (params->stateless_reset_token_present) { |
| 9682 | it = ngtcp2_ksl_begin(&conn->scid.set); |
| 9683 | scident = ngtcp2_ksl_it_get(&it); |
| 9684 | |
| 9685 | memcpy(scident->token, params->stateless_reset_token, |
| 9686 | NGTCP2_STATELESS_RESET_TOKENLEN16); |
| 9687 | } |
| 9688 | |
| 9689 | if (params->preferred_address_present) { |
| 9690 | scident = ngtcp2_mem_malloc(mem, sizeof(*scident)); |
| 9691 | if (scident == NULL((void*)0)) { |
| 9692 | return NGTCP2_ERR_NOMEM-501; |
| 9693 | } |
| 9694 | |
| 9695 | ngtcp2_scid_init(scident, 1, ¶ms->preferred_address.cid, |
| 9696 | params->preferred_address.stateless_reset_token); |
| 9697 | |
| 9698 | rv = ngtcp2_ksl_insert(&conn->scid.set, NULL((void*)0), &scident->cid, scident); |
| 9699 | if (rv != 0) { |
| 9700 | ngtcp2_mem_free(mem, scident); |
| 9701 | return rv; |
| 9702 | } |
| 9703 | |
| 9704 | conn->scid.last_seq = 1; |
| 9705 | } |
| 9706 | } |
| 9707 | |
| 9708 | conn->rx.window = conn->rx.unsent_max_offset = conn->rx.max_offset = |
| 9709 | params->initial_max_data; |
| 9710 | conn->remote.bidi.unsent_max_streams = params->initial_max_streams_bidi; |
| 9711 | conn->remote.bidi.max_streams = params->initial_max_streams_bidi; |
| 9712 | conn->remote.uni.unsent_max_streams = params->initial_max_streams_uni; |
| 9713 | conn->remote.uni.max_streams = params->initial_max_streams_uni; |
| 9714 | |
| 9715 | ngtcp2_qlog_parameters_set_transport_params(&conn->qlog, params, conn->server, |
| 9716 | NGTCP2_QLOG_SIDE_LOCAL); |
| 9717 | |
| 9718 | return 0; |
| 9719 | } |
| 9720 | |
| 9721 | void ngtcp2_conn_get_local_transport_params(ngtcp2_conn *conn, |
| 9722 | ngtcp2_transport_params *params) { |
| 9723 | *params = conn->local.transport_params; |
| 9724 | } |
| 9725 | |
| 9726 | int ngtcp2_conn_open_bidi_stream(ngtcp2_conn *conn, int64_t *pstream_id, |
| 9727 | void *stream_user_data) { |
| 9728 | int rv; |
| 9729 | ngtcp2_strm *strm; |
| 9730 | |
| 9731 | if (ngtcp2_conn_get_streams_bidi_left(conn) == 0) { |
| 9732 | return NGTCP2_ERR_STREAM_ID_BLOCKED-208; |
| 9733 | } |
| 9734 | |
| 9735 | strm = ngtcp2_mem_malloc(conn->mem, sizeof(ngtcp2_strm)); |
| 9736 | if (strm == NULL((void*)0)) { |
| 9737 | return NGTCP2_ERR_NOMEM-501; |
| 9738 | } |
| 9739 | |
| 9740 | rv = ngtcp2_conn_init_stream(conn, strm, conn->local.bidi.next_stream_id, |
| 9741 | stream_user_data); |
| 9742 | if (rv != 0) { |
| 9743 | ngtcp2_mem_free(conn->mem, strm); |
| 9744 | return rv; |
| 9745 | } |
| 9746 | |
| 9747 | *pstream_id = conn->local.bidi.next_stream_id; |
| 9748 | conn->local.bidi.next_stream_id += 4; |
| 9749 | |
| 9750 | return 0; |
| 9751 | } |
| 9752 | |
| 9753 | int ngtcp2_conn_open_uni_stream(ngtcp2_conn *conn, int64_t *pstream_id, |
| 9754 | void *stream_user_data) { |
| 9755 | int rv; |
| 9756 | ngtcp2_strm *strm; |
| 9757 | |
| 9758 | if (ngtcp2_conn_get_streams_uni_left(conn) == 0) { |
| 9759 | return NGTCP2_ERR_STREAM_ID_BLOCKED-208; |
| 9760 | } |
| 9761 | |
| 9762 | strm = ngtcp2_mem_malloc(conn->mem, sizeof(ngtcp2_strm)); |
| 9763 | if (strm == NULL((void*)0)) { |
| 9764 | return NGTCP2_ERR_NOMEM-501; |
| 9765 | } |
| 9766 | |
| 9767 | rv = ngtcp2_conn_init_stream(conn, strm, conn->local.uni.next_stream_id, |
| 9768 | stream_user_data); |
| 9769 | if (rv != 0) { |
| 9770 | ngtcp2_mem_free(conn->mem, strm); |
| 9771 | return rv; |
| 9772 | } |
| 9773 | ngtcp2_strm_shutdown(strm, NGTCP2_STRM_FLAG_SHUT_RD0x01); |
| 9774 | |
| 9775 | *pstream_id = conn->local.uni.next_stream_id; |
| 9776 | conn->local.uni.next_stream_id += 4; |
| 9777 | |
| 9778 | return 0; |
| 9779 | } |
| 9780 | |
| 9781 | ngtcp2_strm *ngtcp2_conn_find_stream(ngtcp2_conn *conn, int64_t stream_id) { |
| 9782 | ngtcp2_map_entry *me; |
| 9783 | |
| 9784 | me = ngtcp2_map_find(&conn->strms, (uint64_t)stream_id); |
| 9785 | if (me == NULL((void*)0)) { |
| 9786 | return NULL((void*)0); |
| 9787 | } |
| 9788 | |
| 9789 | return ngtcp2_struct_of(me, ngtcp2_strm, me)((ngtcp2_strm *)(void *)((char *)(me)-__builtin_offsetof(ngtcp2_strm , me))); |
| 9790 | } |
| 9791 | |
| 9792 | ngtcp2_ssize ngtcp2_conn_write_stream(ngtcp2_conn *conn, ngtcp2_path *path, |
| 9793 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 9794 | size_t destlen, ngtcp2_ssize *pdatalen, |
| 9795 | uint32_t flags, int64_t stream_id, |
| 9796 | const uint8_t *data, size_t datalen, |
| 9797 | ngtcp2_tstamp ts) { |
| 9798 | ngtcp2_vec datav; |
| 9799 | |
| 9800 | datav.len = datalen; |
| 9801 | datav.base = (uint8_t *)data; |
| 9802 | |
| 9803 | return ngtcp2_conn_writev_stream(conn, path, pi, dest, destlen, pdatalen, |
| 9804 | flags, stream_id, &datav, 1, ts); |
| 9805 | } |
| 9806 | |
| 9807 | ngtcp2_ssize ngtcp2_conn_writev_stream(ngtcp2_conn *conn, ngtcp2_path *path, |
| 9808 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 9809 | size_t destlen, ngtcp2_ssize *pdatalen, |
| 9810 | uint32_t flags, int64_t stream_id, |
| 9811 | const ngtcp2_vec *datav, size_t datavcnt, |
| 9812 | ngtcp2_tstamp ts) { |
| 9813 | ngtcp2_vmsg vmsg, *pvmsg; |
| 9814 | ngtcp2_strm *strm; |
| 9815 | |
| 9816 | if (pdatalen) { |
| 9817 | *pdatalen = -1; |
| 9818 | } |
| 9819 | |
| 9820 | if (stream_id != -1) { |
| 9821 | strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 9822 | if (strm == NULL((void*)0)) { |
| 9823 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 9824 | } |
| 9825 | |
| 9826 | if (strm->flags & NGTCP2_STRM_FLAG_SHUT_WR0x02) { |
| 9827 | return NGTCP2_ERR_STREAM_SHUT_WR-221; |
| 9828 | } |
| 9829 | |
| 9830 | vmsg.type = NGTCP2_VMSG_TYPE_STREAM; |
| 9831 | vmsg.stream.strm = strm; |
| 9832 | vmsg.stream.flags = flags; |
| 9833 | vmsg.stream.data = datav; |
| 9834 | vmsg.stream.datacnt = datavcnt; |
| 9835 | vmsg.stream.pdatalen = pdatalen; |
| 9836 | |
| 9837 | pvmsg = &vmsg; |
| 9838 | } else { |
| 9839 | pvmsg = NULL((void*)0); |
| 9840 | } |
| 9841 | |
| 9842 | return ngtcp2_conn_write_vmsg(conn, path, pi, dest, destlen, pvmsg, ts); |
| 9843 | } |
| 9844 | |
| 9845 | ngtcp2_ssize ngtcp2_conn_writev_datagram(ngtcp2_conn *conn, ngtcp2_path *path, |
| 9846 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 9847 | size_t destlen, int *paccepted, |
| 9848 | uint32_t flags, |
| 9849 | const ngtcp2_vec *datav, |
| 9850 | size_t datavcnt, ngtcp2_tstamp ts) { |
| 9851 | ngtcp2_vmsg vmsg; |
| 9852 | |
| 9853 | if (paccepted) { |
| 9854 | *paccepted = 0; |
| 9855 | } |
| 9856 | |
| 9857 | if (conn->remote.transport_params.max_datagram_frame_size == 0) { |
| 9858 | return NGTCP2_ERR_INVALID_STATE-206; |
| 9859 | } |
| 9860 | if (conn->remote.transport_params.max_datagram_frame_size < |
| 9861 | ngtcp2_pkt_datagram_framelen(ngtcp2_vec_len(datav, datavcnt))) { |
| 9862 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 9863 | } |
| 9864 | |
| 9865 | vmsg.type = NGTCP2_VMSG_TYPE_DATAGRAM; |
| 9866 | vmsg.datagram.flags = flags; |
| 9867 | vmsg.datagram.data = datav; |
| 9868 | vmsg.datagram.datacnt = datavcnt; |
| 9869 | vmsg.datagram.paccepted = paccepted; |
| 9870 | |
| 9871 | return ngtcp2_conn_write_vmsg(conn, path, pi, dest, destlen, &vmsg, ts); |
| 9872 | } |
| 9873 | |
| 9874 | ngtcp2_ssize ngtcp2_conn_write_vmsg(ngtcp2_conn *conn, ngtcp2_path *path, |
| 9875 | ngtcp2_pkt_info *pi, uint8_t *dest, |
| 9876 | size_t destlen, ngtcp2_vmsg *vmsg, |
| 9877 | ngtcp2_tstamp ts) { |
| 9878 | ngtcp2_ssize nwrite; |
| 9879 | ngtcp2_pktns *pktns = &conn->pktns; |
Value stored to 'pktns' during its initialization is never read | |
| 9880 | size_t origlen = destlen; |
| 9881 | int rv; |
| 9882 | uint8_t wflags = NGTCP2_WRITE_PKT_FLAG_NONE0x00; |
| 9883 | int ppe_pending = (conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING0x1000) != 0; |
| 9884 | ngtcp2_ssize res = 0; |
| 9885 | size_t server_tx_left; |
| 9886 | |
| 9887 | conn->log.last_ts = ts; |
| 9888 | conn->qlog.last_ts = ts; |
| 9889 | |
| 9890 | if (path) { |
| 9891 | ngtcp2_path_copy(path, &conn->dcid.current.ps.path); |
| 9892 | } |
| 9893 | |
| 9894 | if (!ppe_pending && pi) { |
| 9895 | pi->ecn = NGTCP2_ECN_NOT_ECT0x0; |
| 9896 | } |
| 9897 | |
| 9898 | switch (conn->state) { |
| 9899 | case NGTCP2_CS_CLIENT_INITIAL: |
| 9900 | case NGTCP2_CS_CLIENT_WAIT_HANDSHAKE: |
| 9901 | case NGTCP2_CS_CLIENT_TLS_HANDSHAKE_FAILED: |
| 9902 | nwrite = conn_client_write_handshake(conn, pi, dest, destlen, vmsg, ts); |
| 9903 | if (nwrite < 0) { |
| 9904 | return nwrite; |
| 9905 | } |
| 9906 | if (conn->state != NGTCP2_CS_POST_HANDSHAKE) { |
| 9907 | return nwrite; |
| 9908 | } |
| 9909 | res = nwrite; |
| 9910 | dest += nwrite; |
| 9911 | destlen -= (size_t)nwrite; |
| 9912 | /* Break here so that we can coalesces Short packets. */ |
| 9913 | break; |
| 9914 | case NGTCP2_CS_SERVER_INITIAL: |
| 9915 | case NGTCP2_CS_SERVER_WAIT_HANDSHAKE: |
| 9916 | case NGTCP2_CS_SERVER_TLS_HANDSHAKE_FAILED: |
| 9917 | if (!ppe_pending) { |
| 9918 | if (!(conn->dcid.current.flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01)) { |
| 9919 | server_tx_left = conn_server_tx_left(conn, &conn->dcid.current); |
| 9920 | destlen = ngtcp2_min(destlen, server_tx_left)((destlen) < (server_tx_left) ? (destlen) : (server_tx_left )); |
| 9921 | } |
| 9922 | |
| 9923 | nwrite = conn_write_handshake(conn, pi, dest, destlen, 0, ts); |
| 9924 | if (nwrite < 0) { |
| 9925 | return nwrite; |
| 9926 | } |
| 9927 | |
| 9928 | if (conn->dcid.current.flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01) { |
| 9929 | destlen = origlen; |
| 9930 | } else { |
| 9931 | origlen = destlen; |
| 9932 | } |
| 9933 | |
| 9934 | res = nwrite; |
| 9935 | dest += nwrite; |
| 9936 | destlen -= (size_t)nwrite; |
| 9937 | } |
| 9938 | if (conn->state != NGTCP2_CS_POST_HANDSHAKE && |
| 9939 | conn->pktns.crypto.tx.ckm == NULL((void*)0)) { |
| 9940 | return res; |
| 9941 | } |
| 9942 | break; |
| 9943 | case NGTCP2_CS_POST_HANDSHAKE: |
| 9944 | break; |
| 9945 | case NGTCP2_CS_CLOSING: |
| 9946 | return NGTCP2_ERR_CLOSING-230; |
| 9947 | case NGTCP2_CS_DRAINING: |
| 9948 | return NGTCP2_ERR_DRAINING-231; |
| 9949 | default: |
| 9950 | return 0; |
| 9951 | } |
| 9952 | |
| 9953 | assert(pktns->crypto.tx.ckm)((void) (0)); |
| 9954 | |
| 9955 | if (conn_check_pkt_num_exhausted(conn)) { |
| 9956 | return NGTCP2_ERR_PKT_NUM_EXHAUSTED-216; |
| 9957 | } |
| 9958 | |
| 9959 | if (vmsg) { |
| 9960 | switch (vmsg->type) { |
| 9961 | case NGTCP2_VMSG_TYPE_STREAM: |
| 9962 | if (vmsg->stream.flags & NGTCP2_WRITE_STREAM_FLAG_MORE0x01) { |
| 9963 | wflags |= NGTCP2_WRITE_PKT_FLAG_MORE0x02; |
| 9964 | } |
| 9965 | break; |
| 9966 | case NGTCP2_VMSG_TYPE_DATAGRAM: |
| 9967 | if (vmsg->datagram.flags & NGTCP2_WRITE_DATAGRAM_FLAG_MORE0x01) { |
| 9968 | wflags |= NGTCP2_WRITE_PKT_FLAG_MORE0x02; |
| 9969 | } |
| 9970 | break; |
| 9971 | default: |
| 9972 | break; |
| 9973 | } |
| 9974 | } |
| 9975 | |
| 9976 | if (ppe_pending) { |
| 9977 | res = conn->pkt.hs_spktlen; |
| 9978 | conn->pkt.hs_spktlen = 0; |
| 9979 | /* dest and destlen have already been adjusted in ppe in the first |
| 9980 | run. They are adjusted for probe packet later. */ |
| 9981 | nwrite = conn_write_pkt(conn, pi, dest, destlen, vmsg, NGTCP2_PKT_SHORT, |
| 9982 | wflags, ts); |
| 9983 | goto fin; |
| 9984 | } else { |
| 9985 | if (conn->state == NGTCP2_CS_POST_HANDSHAKE) { |
| 9986 | rv = conn_prepare_key_update(conn, ts); |
| 9987 | if (rv != 0) { |
| 9988 | return rv; |
| 9989 | } |
| 9990 | } |
| 9991 | |
| 9992 | if (!conn->pktns.rtb.probe_pkt_left && conn_cwnd_is_zero(conn)) { |
| 9993 | destlen = 0; |
| 9994 | } else { |
| 9995 | nwrite = conn_write_path_response(conn, path, pi, dest, destlen, ts); |
| 9996 | if (nwrite) { |
| 9997 | goto fin; |
| 9998 | } |
| 9999 | |
| 10000 | if (conn->pv) { |
| 10001 | nwrite = conn_write_path_challenge(conn, path, pi, dest, destlen, ts); |
| 10002 | if (nwrite) { |
| 10003 | goto fin; |
| 10004 | } |
| 10005 | } |
| 10006 | |
| 10007 | if (conn->server && |
| 10008 | !(conn->dcid.current.flags & NGTCP2_DCID_FLAG_PATH_VALIDATED0x01)) { |
| 10009 | server_tx_left = conn_server_tx_left(conn, &conn->dcid.current); |
| 10010 | origlen = ngtcp2_min(origlen, server_tx_left)((origlen) < (server_tx_left) ? (origlen) : (server_tx_left )); |
| 10011 | destlen = ngtcp2_min(destlen, server_tx_left)((destlen) < (server_tx_left) ? (destlen) : (server_tx_left )); |
| 10012 | |
| 10013 | if (destlen == 0 && conn->cstat.loss_detection_timer != UINT64_MAX(18446744073709551615UL)) { |
| 10014 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10015 | "loss detection timer canceled"); |
| 10016 | conn->cstat.loss_detection_timer = UINT64_MAX(18446744073709551615UL); |
| 10017 | conn->cstat.pto_count = 0; |
| 10018 | } |
| 10019 | } |
| 10020 | } |
| 10021 | } |
| 10022 | |
| 10023 | if (res == 0) { |
| 10024 | if (conn_handshake_remnants_left(conn)) { |
| 10025 | if (conn_handshake_probe_left(conn)) { |
| 10026 | destlen = origlen; |
| 10027 | } |
| 10028 | nwrite = conn_write_handshake_pkts(conn, pi, dest, destlen, 0, ts); |
| 10029 | if (nwrite < 0) { |
| 10030 | return nwrite; |
| 10031 | } |
| 10032 | if (nwrite > 0) { |
| 10033 | res = nwrite; |
| 10034 | dest += nwrite; |
| 10035 | destlen -= (size_t)nwrite; |
| 10036 | } |
| 10037 | } |
| 10038 | } |
| 10039 | |
| 10040 | if (conn->pktns.rtb.probe_pkt_left) { |
| 10041 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_CON, |
| 10042 | "transmit probe pkt left=%zu", |
| 10043 | conn->pktns.rtb.probe_pkt_left); |
| 10044 | |
| 10045 | nwrite = conn_write_pkt(conn, pi, dest, destlen, vmsg, NGTCP2_PKT_SHORT, |
| 10046 | wflags, ts); |
| 10047 | |
| 10048 | goto fin; |
| 10049 | } |
| 10050 | |
| 10051 | nwrite = conn_write_pkt(conn, pi, dest, destlen, vmsg, NGTCP2_PKT_SHORT, |
| 10052 | wflags, ts); |
| 10053 | if (nwrite) { |
| 10054 | assert(nwrite != NGTCP2_ERR_NOBUF)((void) (0)); |
| 10055 | goto fin; |
| 10056 | } |
| 10057 | |
| 10058 | if (res == 0) { |
| 10059 | nwrite = conn_write_ack_pkt(conn, pi, dest, origlen, NGTCP2_PKT_SHORT, ts); |
| 10060 | } |
| 10061 | |
| 10062 | fin: |
| 10063 | conn->pkt.hs_spktlen = 0; |
| 10064 | |
| 10065 | if (nwrite >= 0) { |
| 10066 | res += nwrite; |
| 10067 | return res; |
| 10068 | } |
| 10069 | /* NGTCP2_CONN_FLAG_PPE_PENDING is set in conn_write_pkt above. |
| 10070 | ppe_pending cannot be used here. */ |
| 10071 | if (conn->flags & NGTCP2_CONN_FLAG_PPE_PENDING0x1000) { |
| 10072 | conn->pkt.hs_spktlen = res; |
| 10073 | } |
| 10074 | |
| 10075 | return nwrite; |
| 10076 | } |
| 10077 | |
| 10078 | static ngtcp2_ssize |
| 10079 | conn_write_connection_close(ngtcp2_conn *conn, ngtcp2_pkt_info *pi, |
| 10080 | uint8_t *dest, size_t destlen, uint8_t pkt_type, |
| 10081 | uint64_t error_code, ngtcp2_tstamp ts) { |
| 10082 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 10083 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 10084 | ngtcp2_ssize res = 0, nwrite; |
| 10085 | ngtcp2_frame fr; |
| 10086 | |
| 10087 | fr.type = NGTCP2_FRAME_CONNECTION_CLOSE; |
| 10088 | fr.connection_close.error_code = error_code; |
| 10089 | fr.connection_close.frame_type = 0; |
| 10090 | fr.connection_close.reasonlen = 0; |
| 10091 | fr.connection_close.reason = NULL((void*)0); |
| 10092 | |
| 10093 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80) && |
| 10094 | pkt_type != NGTCP2_PKT_INITIAL) { |
| 10095 | if (in_pktns && conn->server) { |
| 10096 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 10097 | conn, pi, dest, destlen, NGTCP2_PKT_INITIAL, &conn->dcid.current.cid, |
| 10098 | &fr, NGTCP2_RTB_ENTRY_FLAG_NONE0x00, NULL((void*)0), ts); |
| 10099 | if (nwrite < 0) { |
| 10100 | return nwrite; |
| 10101 | } |
| 10102 | |
| 10103 | dest += nwrite; |
| 10104 | destlen -= (size_t)nwrite; |
| 10105 | res += nwrite; |
| 10106 | } |
| 10107 | |
| 10108 | if (pkt_type != NGTCP2_PKT_HANDSHAKE && hs_pktns && |
| 10109 | hs_pktns->crypto.tx.ckm) { |
| 10110 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 10111 | conn, pi, dest, destlen, NGTCP2_PKT_HANDSHAKE, |
| 10112 | &conn->dcid.current.cid, &fr, NGTCP2_RTB_ENTRY_FLAG_NONE0x00, NULL((void*)0), ts); |
| 10113 | if (nwrite < 0) { |
| 10114 | return nwrite; |
| 10115 | } |
| 10116 | |
| 10117 | dest += nwrite; |
| 10118 | destlen -= (size_t)nwrite; |
| 10119 | res += nwrite; |
| 10120 | } |
| 10121 | } |
| 10122 | |
| 10123 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 10124 | conn, pi, dest, destlen, pkt_type, &conn->dcid.current.cid, &fr, |
| 10125 | NGTCP2_RTB_ENTRY_FLAG_NONE0x00, NULL((void*)0), ts); |
| 10126 | |
| 10127 | if (nwrite < 0) { |
| 10128 | return nwrite; |
| 10129 | } |
| 10130 | |
| 10131 | res += nwrite; |
| 10132 | |
| 10133 | if (res == 0) { |
| 10134 | return NGTCP2_ERR_NOBUF-203; |
| 10135 | } |
| 10136 | |
| 10137 | return res; |
| 10138 | } |
| 10139 | |
| 10140 | ngtcp2_ssize ngtcp2_conn_write_connection_close( |
| 10141 | ngtcp2_conn *conn, ngtcp2_path *path, ngtcp2_pkt_info *pi, uint8_t *dest, |
| 10142 | size_t destlen, uint64_t error_code, ngtcp2_tstamp ts) { |
| 10143 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 10144 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 10145 | uint8_t pkt_type; |
| 10146 | ngtcp2_ssize nwrite; |
| 10147 | |
| 10148 | conn->log.last_ts = ts; |
| 10149 | conn->qlog.last_ts = ts; |
| 10150 | |
| 10151 | if (conn_check_pkt_num_exhausted(conn)) { |
| 10152 | return NGTCP2_ERR_PKT_NUM_EXHAUSTED-216; |
| 10153 | } |
| 10154 | |
| 10155 | switch (conn->state) { |
| 10156 | case NGTCP2_CS_CLIENT_INITIAL: |
| 10157 | case NGTCP2_CS_CLOSING: |
| 10158 | case NGTCP2_CS_DRAINING: |
| 10159 | return NGTCP2_ERR_INVALID_STATE-206; |
| 10160 | default: |
| 10161 | break; |
| 10162 | } |
| 10163 | |
| 10164 | if (path) { |
| 10165 | ngtcp2_path_copy(path, &conn->dcid.current.ps.path); |
| 10166 | } |
| 10167 | |
| 10168 | if (pi) { |
| 10169 | pi->ecn = NGTCP2_ECN_NOT_ECT0x0; |
| 10170 | } |
| 10171 | |
| 10172 | if (conn->state == NGTCP2_CS_POST_HANDSHAKE || |
| 10173 | (conn->server && conn->pktns.crypto.tx.ckm)) { |
| 10174 | pkt_type = NGTCP2_PKT_SHORT; |
| 10175 | } else if (hs_pktns && hs_pktns->crypto.tx.ckm) { |
| 10176 | pkt_type = NGTCP2_PKT_HANDSHAKE; |
| 10177 | } else if (in_pktns && in_pktns->crypto.tx.ckm) { |
| 10178 | pkt_type = NGTCP2_PKT_INITIAL; |
| 10179 | } else { |
| 10180 | /* This branch is taken if server has not read any Initial packet |
| 10181 | from client. */ |
| 10182 | return NGTCP2_ERR_INVALID_STATE-206; |
| 10183 | } |
| 10184 | |
| 10185 | nwrite = conn_write_connection_close(conn, pi, dest, destlen, pkt_type, |
| 10186 | error_code, ts); |
| 10187 | if (nwrite < 0) { |
| 10188 | return nwrite; |
| 10189 | } |
| 10190 | |
| 10191 | conn->state = NGTCP2_CS_CLOSING; |
| 10192 | |
| 10193 | return nwrite; |
| 10194 | } |
| 10195 | |
| 10196 | ngtcp2_ssize ngtcp2_conn_write_application_close( |
| 10197 | ngtcp2_conn *conn, ngtcp2_path *path, ngtcp2_pkt_info *pi, uint8_t *dest, |
| 10198 | size_t destlen, uint64_t app_error_code, ngtcp2_tstamp ts) { |
| 10199 | ngtcp2_ssize nwrite; |
| 10200 | ngtcp2_ssize res = 0; |
| 10201 | ngtcp2_frame fr; |
| 10202 | |
| 10203 | conn->log.last_ts = ts; |
| 10204 | conn->qlog.last_ts = ts; |
| 10205 | |
| 10206 | if (conn_check_pkt_num_exhausted(conn)) { |
| 10207 | return NGTCP2_ERR_PKT_NUM_EXHAUSTED-216; |
| 10208 | } |
| 10209 | |
| 10210 | switch (conn->state) { |
| 10211 | case NGTCP2_CS_CLIENT_INITIAL: |
| 10212 | case NGTCP2_CS_CLOSING: |
| 10213 | case NGTCP2_CS_DRAINING: |
| 10214 | return NGTCP2_ERR_INVALID_STATE-206; |
| 10215 | default: |
| 10216 | break; |
| 10217 | } |
| 10218 | |
| 10219 | if (path) { |
| 10220 | ngtcp2_path_copy(path, &conn->dcid.current.ps.path); |
| 10221 | } |
| 10222 | |
| 10223 | if (pi) { |
| 10224 | pi->ecn = NGTCP2_ECN_NOT_ECT0x0; |
| 10225 | } |
| 10226 | |
| 10227 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)) { |
| 10228 | nwrite = conn_write_connection_close(conn, pi, dest, destlen, |
| 10229 | conn->hs_pktns->crypto.tx.ckm |
| 10230 | ? NGTCP2_PKT_HANDSHAKE |
| 10231 | : NGTCP2_PKT_INITIAL, |
| 10232 | NGTCP2_APPLICATION_ERROR0xcu, ts); |
| 10233 | if (nwrite < 0) { |
| 10234 | return nwrite; |
| 10235 | } |
| 10236 | res = nwrite; |
| 10237 | dest += nwrite; |
| 10238 | destlen -= (size_t)nwrite; |
| 10239 | } |
| 10240 | |
| 10241 | if (conn->state != NGTCP2_CS_POST_HANDSHAKE) { |
| 10242 | assert(res)((void) (0)); |
| 10243 | |
| 10244 | if (!conn->server || !conn->pktns.crypto.tx.ckm) { |
| 10245 | return res; |
| 10246 | } |
| 10247 | } |
| 10248 | |
| 10249 | assert(conn->pktns.crypto.tx.ckm)((void) (0)); |
| 10250 | |
| 10251 | fr.type = NGTCP2_FRAME_CONNECTION_CLOSE_APP; |
| 10252 | fr.connection_close.error_code = app_error_code; |
| 10253 | fr.connection_close.frame_type = 0; |
| 10254 | fr.connection_close.reasonlen = 0; |
| 10255 | fr.connection_close.reason = NULL((void*)0); |
| 10256 | |
| 10257 | nwrite = ngtcp2_conn_write_single_frame_pkt( |
| 10258 | conn, pi, dest, destlen, NGTCP2_PKT_SHORT, &conn->dcid.current.cid, &fr, |
| 10259 | NGTCP2_RTB_ENTRY_FLAG_NONE0x00, NULL((void*)0), ts); |
| 10260 | |
| 10261 | if (nwrite < 0) { |
| 10262 | return nwrite; |
| 10263 | } |
| 10264 | |
| 10265 | res += nwrite; |
| 10266 | |
| 10267 | if (res == 0) { |
| 10268 | return NGTCP2_ERR_NOBUF-203; |
| 10269 | } |
| 10270 | |
| 10271 | conn->state = NGTCP2_CS_CLOSING; |
| 10272 | |
| 10273 | return res; |
| 10274 | } |
| 10275 | |
| 10276 | int ngtcp2_conn_is_in_closing_period(ngtcp2_conn *conn) { |
| 10277 | return conn->state == NGTCP2_CS_CLOSING; |
| 10278 | } |
| 10279 | |
| 10280 | int ngtcp2_conn_is_in_draining_period(ngtcp2_conn *conn) { |
| 10281 | return conn->state == NGTCP2_CS_DRAINING; |
| 10282 | } |
| 10283 | |
| 10284 | int ngtcp2_conn_close_stream(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 10285 | uint64_t app_error_code) { |
| 10286 | int rv; |
| 10287 | |
| 10288 | if (!strm->app_error_code) { |
| 10289 | app_error_code = strm->app_error_code; |
| 10290 | } |
| 10291 | |
| 10292 | rv = ngtcp2_map_remove(&conn->strms, strm->me.key); |
| 10293 | if (rv != 0) { |
| 10294 | assert(rv != NGTCP2_ERR_INVALID_ARGUMENT)((void) (0)); |
| 10295 | return rv; |
| 10296 | } |
| 10297 | |
| 10298 | rv = conn_call_stream_close(conn, strm, app_error_code); |
| 10299 | if (rv != 0) { |
| 10300 | goto fin; |
| 10301 | } |
| 10302 | |
| 10303 | if (ngtcp2_strm_is_tx_queued(strm)) { |
| 10304 | ngtcp2_pq_remove(&conn->tx.strmq, &strm->pe); |
| 10305 | } |
| 10306 | |
| 10307 | fin: |
| 10308 | ngtcp2_strm_free(strm); |
| 10309 | ngtcp2_mem_free(conn->mem, strm); |
| 10310 | |
| 10311 | return rv; |
| 10312 | } |
| 10313 | |
| 10314 | int ngtcp2_conn_close_stream_if_shut_rdwr(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 10315 | uint64_t app_error_code) { |
| 10316 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_RDWR(0x01 | 0x02)) == |
| 10317 | NGTCP2_STRM_FLAG_SHUT_RDWR(0x01 | 0x02) && |
| 10318 | ((strm->flags & NGTCP2_STRM_FLAG_RECV_RST0x08) || |
| 10319 | ngtcp2_strm_rx_offset(strm) == strm->rx.last_offset) && |
| 10320 | (((strm->flags & NGTCP2_STRM_FLAG_SENT_RST0x04) && |
| 10321 | (strm->flags & NGTCP2_STRM_FLAG_RST_ACKED0x20)) || |
| 10322 | (!(strm->flags & NGTCP2_STRM_FLAG_SENT_RST0x04) && |
| 10323 | ngtcp2_strm_is_all_tx_data_acked(strm)))) { |
| 10324 | return ngtcp2_conn_close_stream(conn, strm, app_error_code); |
| 10325 | } |
| 10326 | return 0; |
| 10327 | } |
| 10328 | |
| 10329 | /* |
| 10330 | * conn_shutdown_stream_write closes send stream with error code |
| 10331 | * |app_error_code|. RESET_STREAM frame is scheduled. |
| 10332 | * |
| 10333 | * This function returns 0 if it succeeds, or one of the following |
| 10334 | * negative error codes: |
| 10335 | * |
| 10336 | * NGTCP2_ERR_NOMEM |
| 10337 | * Out of memory. |
| 10338 | */ |
| 10339 | static int conn_shutdown_stream_write(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 10340 | uint64_t app_error_code) { |
| 10341 | if (strm->flags & NGTCP2_STRM_FLAG_SENT_RST0x04) { |
| 10342 | return 0; |
| 10343 | } |
| 10344 | |
| 10345 | /* Set this flag so that we don't accidentally send DATA to this |
| 10346 | stream. */ |
| 10347 | strm->flags |= NGTCP2_STRM_FLAG_SHUT_WR0x02 | NGTCP2_STRM_FLAG_SENT_RST0x04; |
| 10348 | strm->app_error_code = app_error_code; |
| 10349 | |
| 10350 | ngtcp2_strm_streamfrq_clear(strm); |
| 10351 | |
| 10352 | return conn_reset_stream(conn, strm, app_error_code); |
| 10353 | } |
| 10354 | |
| 10355 | /* |
| 10356 | * conn_shutdown_stream_read closes read stream with error code |
| 10357 | * |app_error_code|. STOP_SENDING frame is scheduled. |
| 10358 | * |
| 10359 | * This function returns 0 if it succeeds, or one of the following |
| 10360 | * negative error codes: |
| 10361 | * |
| 10362 | * NGTCP2_ERR_NOMEM |
| 10363 | * Out of memory. |
| 10364 | */ |
| 10365 | static int conn_shutdown_stream_read(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 10366 | uint64_t app_error_code) { |
| 10367 | if (strm->flags & NGTCP2_STRM_FLAG_STOP_SENDING0x10) { |
| 10368 | return 0; |
| 10369 | } |
| 10370 | if ((strm->flags & NGTCP2_STRM_FLAG_SHUT_RD0x01) && |
| 10371 | ngtcp2_strm_rx_offset(strm) == strm->rx.last_offset) { |
| 10372 | return 0; |
| 10373 | } |
| 10374 | |
| 10375 | /* Extend connection flow control window for the amount of data |
| 10376 | which are not passed to application. */ |
| 10377 | if (!(strm->flags & |
| 10378 | (NGTCP2_STRM_FLAG_STOP_SENDING0x10 | NGTCP2_STRM_FLAG_RECV_RST0x08))) { |
| 10379 | ngtcp2_conn_extend_max_offset(conn, strm->rx.last_offset - |
| 10380 | ngtcp2_strm_rx_offset(strm)); |
| 10381 | } |
| 10382 | |
| 10383 | strm->flags |= NGTCP2_STRM_FLAG_STOP_SENDING0x10; |
| 10384 | strm->app_error_code = app_error_code; |
| 10385 | |
| 10386 | return conn_stop_sending(conn, strm, app_error_code); |
| 10387 | } |
| 10388 | |
| 10389 | int ngtcp2_conn_shutdown_stream(ngtcp2_conn *conn, int64_t stream_id, |
| 10390 | uint64_t app_error_code) { |
| 10391 | int rv; |
| 10392 | ngtcp2_strm *strm; |
| 10393 | |
| 10394 | strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 10395 | if (strm == NULL((void*)0)) { |
| 10396 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 10397 | } |
| 10398 | |
| 10399 | rv = conn_shutdown_stream_read(conn, strm, app_error_code); |
| 10400 | if (rv != 0) { |
| 10401 | return rv; |
| 10402 | } |
| 10403 | |
| 10404 | rv = conn_shutdown_stream_write(conn, strm, app_error_code); |
| 10405 | if (rv != 0) { |
| 10406 | return rv; |
| 10407 | } |
| 10408 | |
| 10409 | return 0; |
| 10410 | } |
| 10411 | |
| 10412 | int ngtcp2_conn_shutdown_stream_write(ngtcp2_conn *conn, int64_t stream_id, |
| 10413 | uint64_t app_error_code) { |
| 10414 | ngtcp2_strm *strm; |
| 10415 | |
| 10416 | strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 10417 | if (strm == NULL((void*)0)) { |
| 10418 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 10419 | } |
| 10420 | |
| 10421 | return conn_shutdown_stream_write(conn, strm, app_error_code); |
| 10422 | } |
| 10423 | |
| 10424 | int ngtcp2_conn_shutdown_stream_read(ngtcp2_conn *conn, int64_t stream_id, |
| 10425 | uint64_t app_error_code) { |
| 10426 | ngtcp2_strm *strm; |
| 10427 | |
| 10428 | strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 10429 | if (strm == NULL((void*)0)) { |
| 10430 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 10431 | } |
| 10432 | |
| 10433 | return conn_shutdown_stream_read(conn, strm, app_error_code); |
| 10434 | } |
| 10435 | |
| 10436 | /* |
| 10437 | * conn_extend_max_stream_offset extends stream level flow control |
| 10438 | * window by |datalen| of the stream denoted by |strm|. |
| 10439 | * |
| 10440 | * This function returns 0 if it succeeds, or one of the following |
| 10441 | * negative error codes: |
| 10442 | * |
| 10443 | * NGTCP2_ERR_NOMEM |
| 10444 | * Out of memory. |
| 10445 | */ |
| 10446 | static int conn_extend_max_stream_offset(ngtcp2_conn *conn, ngtcp2_strm *strm, |
| 10447 | uint64_t datalen) { |
| 10448 | ngtcp2_strm *top; |
| 10449 | |
| 10450 | if (datalen > NGTCP2_MAX_VARINT((1ULL << 62) - 1) || |
| 10451 | strm->rx.unsent_max_offset > NGTCP2_MAX_VARINT((1ULL << 62) - 1) - datalen) { |
| 10452 | strm->rx.unsent_max_offset = NGTCP2_MAX_VARINT((1ULL << 62) - 1); |
| 10453 | } else { |
| 10454 | strm->rx.unsent_max_offset += datalen; |
| 10455 | } |
| 10456 | |
| 10457 | if (!(strm->flags & |
| 10458 | (NGTCP2_STRM_FLAG_SHUT_RD0x01 | NGTCP2_STRM_FLAG_STOP_SENDING0x10)) && |
| 10459 | !ngtcp2_strm_is_tx_queued(strm) && |
| 10460 | conn_should_send_max_stream_data(conn, strm)) { |
| 10461 | if (!ngtcp2_pq_empty(&conn->tx.strmq)) { |
| 10462 | top = ngtcp2_conn_tx_strmq_top(conn); |
| 10463 | strm->cycle = top->cycle; |
| 10464 | } |
| 10465 | strm->cycle = conn_tx_strmq_first_cycle(conn); |
| 10466 | return ngtcp2_conn_tx_strmq_push(conn, strm); |
| 10467 | } |
| 10468 | |
| 10469 | return 0; |
| 10470 | } |
| 10471 | |
| 10472 | int ngtcp2_conn_extend_max_stream_offset(ngtcp2_conn *conn, int64_t stream_id, |
| 10473 | uint64_t datalen) { |
| 10474 | ngtcp2_strm *strm; |
| 10475 | |
| 10476 | strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 10477 | if (strm == NULL((void*)0)) { |
| 10478 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 10479 | } |
| 10480 | |
| 10481 | return conn_extend_max_stream_offset(conn, strm, datalen); |
| 10482 | } |
| 10483 | |
| 10484 | void ngtcp2_conn_extend_max_offset(ngtcp2_conn *conn, uint64_t datalen) { |
| 10485 | if (NGTCP2_MAX_VARINT((1ULL << 62) - 1) < datalen || |
| 10486 | conn->rx.unsent_max_offset > NGTCP2_MAX_VARINT((1ULL << 62) - 1) - datalen) { |
| 10487 | conn->rx.unsent_max_offset = NGTCP2_MAX_VARINT((1ULL << 62) - 1); |
| 10488 | return; |
| 10489 | } |
| 10490 | |
| 10491 | conn->rx.unsent_max_offset += datalen; |
| 10492 | } |
| 10493 | |
| 10494 | void ngtcp2_conn_extend_max_streams_bidi(ngtcp2_conn *conn, size_t n) { |
| 10495 | handle_max_remote_streams_extension(&conn->remote.bidi.unsent_max_streams, n); |
| 10496 | } |
| 10497 | |
| 10498 | void ngtcp2_conn_extend_max_streams_uni(ngtcp2_conn *conn, size_t n) { |
| 10499 | handle_max_remote_streams_extension(&conn->remote.uni.unsent_max_streams, n); |
| 10500 | } |
| 10501 | |
| 10502 | const ngtcp2_cid *ngtcp2_conn_get_dcid(ngtcp2_conn *conn) { |
| 10503 | return &conn->dcid.current.cid; |
| 10504 | } |
| 10505 | |
| 10506 | uint32_t ngtcp2_conn_get_negotiated_version(ngtcp2_conn *conn) { |
| 10507 | return conn->version; |
| 10508 | } |
| 10509 | |
| 10510 | int ngtcp2_conn_early_data_rejected(ngtcp2_conn *conn) { |
| 10511 | ngtcp2_pktns *pktns = &conn->pktns; |
| 10512 | ngtcp2_rtb *rtb = &conn->pktns.rtb; |
| 10513 | int rv; |
| 10514 | |
| 10515 | conn->flags |= NGTCP2_CONN_FLAG_EARLY_DATA_REJECTED0x20; |
| 10516 | |
| 10517 | rv = ngtcp2_rtb_remove_all(rtb, conn, pktns, &conn->cstat); |
| 10518 | if (rv != 0) { |
| 10519 | return rv; |
| 10520 | } |
| 10521 | |
| 10522 | return rv; |
| 10523 | } |
| 10524 | |
| 10525 | void ngtcp2_conn_update_rtt(ngtcp2_conn *conn, ngtcp2_duration rtt, |
| 10526 | ngtcp2_duration ack_delay, ngtcp2_tstamp ts) { |
| 10527 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 10528 | ngtcp2_duration min_rtt; |
| 10529 | |
| 10530 | rtt = ngtcp2_max(rtt, NGTCP2_GRANULARITY)((rtt) > (((uint64_t)1000000ULL)) ? (rtt) : (((uint64_t)1000000ULL ))); |
| 10531 | |
| 10532 | cstat->latest_rtt = rtt; |
| 10533 | |
| 10534 | if (cstat->min_rtt == UINT64_MAX(18446744073709551615UL)) { |
| 10535 | cstat->min_rtt = rtt; |
| 10536 | cstat->smoothed_rtt = rtt; |
| 10537 | cstat->rttvar = rtt / 2; |
| 10538 | cstat->first_rtt_sample_ts = ts; |
| 10539 | } else { |
| 10540 | min_rtt = ngtcp2_min(cstat->min_rtt, rtt)((cstat->min_rtt) < (rtt) ? (cstat->min_rtt) : (rtt) ); |
| 10541 | if (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80) { |
| 10542 | ack_delay = |
| 10543 | ngtcp2_min(ack_delay, conn->remote.transport_params.max_ack_delay)((ack_delay) < (conn->remote.transport_params.max_ack_delay ) ? (ack_delay) : (conn->remote.transport_params.max_ack_delay )); |
| 10544 | } else if (ack_delay > 0 && rtt < cstat->min_rtt + ack_delay) { |
| 10545 | /* Ignore RTT sample if adjusting ack_delay causes the sample |
| 10546 | less than min_rtt before handshake confirmation. */ |
| 10547 | ngtcp2_log_info( |
| 10548 | &conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10549 | "ignore rtt sample because ack_delay is too large latest_rtt=%" PRIu64"l" "u" |
| 10550 | " min_rtt=%" PRIu64"l" "u" " ack_delay=%" PRIu64"l" "u", |
| 10551 | (uint64_t)(rtt / NGTCP2_MILLISECONDS((uint64_t)1000000ULL)), |
| 10552 | (uint64_t)(cstat->min_rtt / NGTCP2_MILLISECONDS((uint64_t)1000000ULL)), |
| 10553 | (uint64_t)(ack_delay / NGTCP2_MILLISECONDS((uint64_t)1000000ULL))); |
| 10554 | return; |
| 10555 | } |
| 10556 | |
| 10557 | if (rtt > min_rtt + ack_delay) { |
| 10558 | rtt -= ack_delay; |
| 10559 | } |
| 10560 | |
| 10561 | cstat->min_rtt = min_rtt; |
| 10562 | cstat->rttvar = (cstat->rttvar * 3 + (cstat->smoothed_rtt < rtt |
| 10563 | ? rtt - cstat->smoothed_rtt |
| 10564 | : cstat->smoothed_rtt - rtt)) / |
| 10565 | 4; |
| 10566 | cstat->smoothed_rtt = (cstat->smoothed_rtt * 7 + rtt) / 8; |
| 10567 | } |
| 10568 | |
| 10569 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10570 | "latest_rtt=%" PRIu64"l" "u" " min_rtt=%" PRIu64"l" "u" |
| 10571 | " smoothed_rtt=%" PRIu64"l" "u" " rttvar=%" PRIu64"l" "u" |
| 10572 | " ack_delay=%" PRIu64"l" "u", |
| 10573 | (uint64_t)(cstat->latest_rtt / NGTCP2_MILLISECONDS((uint64_t)1000000ULL)), |
| 10574 | (uint64_t)(cstat->min_rtt / NGTCP2_MILLISECONDS((uint64_t)1000000ULL)), |
| 10575 | cstat->smoothed_rtt / NGTCP2_MILLISECONDS((uint64_t)1000000ULL), |
| 10576 | cstat->rttvar / NGTCP2_MILLISECONDS((uint64_t)1000000ULL), |
| 10577 | (uint64_t)(ack_delay / NGTCP2_MILLISECONDS((uint64_t)1000000ULL))); |
| 10578 | } |
| 10579 | |
| 10580 | void ngtcp2_conn_get_conn_stat(ngtcp2_conn *conn, ngtcp2_conn_stat *cstat) { |
| 10581 | *cstat = conn->cstat; |
| 10582 | } |
| 10583 | |
| 10584 | static ngtcp2_pktns *conn_get_earliest_pktns(ngtcp2_conn *conn, |
| 10585 | ngtcp2_tstamp *pts, |
| 10586 | const ngtcp2_tstamp *times) { |
| 10587 | ngtcp2_pktns *ns[] = {conn->in_pktns, conn->hs_pktns, &conn->pktns}; |
| 10588 | ngtcp2_pktns *res = ns[0]; |
| 10589 | size_t i; |
| 10590 | ngtcp2_tstamp earliest_ts = times[NGTCP2_PKTNS_ID_INITIAL]; |
| 10591 | |
| 10592 | for (i = NGTCP2_PKTNS_ID_HANDSHAKE; i < NGTCP2_PKTNS_ID_MAX; ++i) { |
| 10593 | if (ns[i] == NULL((void*)0) || ns[i]->rtb.num_retransmittable == 0 || |
| 10594 | (times[i] == UINT64_MAX(18446744073709551615UL) || |
| 10595 | (earliest_ts != UINT64_MAX(18446744073709551615UL) && times[i] >= earliest_ts) || |
| 10596 | (i == NGTCP2_PKTNS_ID_APPLICATION && |
| 10597 | !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)))) { |
| 10598 | continue; |
| 10599 | } |
| 10600 | |
| 10601 | earliest_ts = times[i]; |
| 10602 | res = ns[i]; |
| 10603 | } |
| 10604 | |
| 10605 | if (res == NULL((void*)0) && !conn->server) { |
| 10606 | earliest_ts = UINT64_MAX(18446744073709551615UL); |
| 10607 | |
| 10608 | if (conn->hs_pktns && conn->hs_pktns->crypto.tx.ckm) { |
| 10609 | res = conn->hs_pktns; |
| 10610 | } else { |
| 10611 | res = conn->in_pktns; |
| 10612 | } |
| 10613 | } |
| 10614 | |
| 10615 | if (pts) { |
| 10616 | *pts = earliest_ts; |
| 10617 | } |
| 10618 | return res; |
| 10619 | } |
| 10620 | |
| 10621 | void ngtcp2_conn_set_loss_detection_timer(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 10622 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 10623 | ngtcp2_duration timeout; |
| 10624 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 10625 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 10626 | ngtcp2_pktns *pktns = &conn->pktns; |
| 10627 | ngtcp2_pktns *earliest_pktns; |
| 10628 | ngtcp2_tstamp earliest_loss_time; |
| 10629 | ngtcp2_tstamp last_tx_pkt_ts; |
| 10630 | |
| 10631 | conn_get_earliest_pktns(conn, &earliest_loss_time, cstat->loss_time); |
| 10632 | |
| 10633 | if (earliest_loss_time != UINT64_MAX(18446744073709551615UL)) { |
| 10634 | cstat->loss_detection_timer = earliest_loss_time; |
| 10635 | |
| 10636 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10637 | "loss_detection_timer=%" PRIu64"l" "u" " nonzero crypto loss time", |
| 10638 | cstat->loss_detection_timer); |
| 10639 | return; |
| 10640 | } |
| 10641 | |
| 10642 | if ((!in_pktns || in_pktns->rtb.num_retransmittable == 0) && |
| 10643 | (!hs_pktns || hs_pktns->rtb.num_retransmittable == 0) && |
| 10644 | (pktns->rtb.num_retransmittable == 0 || |
| 10645 | !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)) && |
| 10646 | (conn->server || |
| 10647 | (conn->flags & (NGTCP2_CONN_FLAG_SERVER_ADDR_VERIFIED0x4000 | |
| 10648 | NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)))) { |
| 10649 | if (cstat->loss_detection_timer != UINT64_MAX(18446744073709551615UL)) { |
| 10650 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10651 | "loss detection timer canceled"); |
| 10652 | cstat->loss_detection_timer = UINT64_MAX(18446744073709551615UL); |
| 10653 | cstat->pto_count = 0; |
| 10654 | } |
| 10655 | return; |
| 10656 | } |
| 10657 | |
| 10658 | earliest_pktns = |
| 10659 | conn_get_earliest_pktns(conn, &last_tx_pkt_ts, cstat->last_tx_pkt_ts); |
| 10660 | |
| 10661 | assert(earliest_pktns)((void) (0)); |
| 10662 | |
| 10663 | if (last_tx_pkt_ts == UINT64_MAX(18446744073709551615UL)) { |
| 10664 | last_tx_pkt_ts = ts; |
| 10665 | } |
| 10666 | |
| 10667 | timeout = conn_compute_pto(conn, earliest_pktns) * (1ULL << cstat->pto_count); |
| 10668 | |
| 10669 | cstat->loss_detection_timer = last_tx_pkt_ts + timeout; |
| 10670 | |
| 10671 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10672 | "loss_detection_timer=%" PRIu64"l" "u" " last_tx_pkt_ts=%" PRIu64"l" "u" |
| 10673 | " timeout=%" PRIu64"l" "u", |
| 10674 | cstat->loss_detection_timer, last_tx_pkt_ts, |
| 10675 | (uint64_t)(timeout / NGTCP2_MILLISECONDS((uint64_t)1000000ULL))); |
| 10676 | } |
| 10677 | |
| 10678 | int ngtcp2_conn_on_loss_detection_timer(ngtcp2_conn *conn, ngtcp2_tstamp ts) { |
| 10679 | ngtcp2_conn_stat *cstat = &conn->cstat; |
| 10680 | int rv; |
| 10681 | ngtcp2_pktns *in_pktns = conn->in_pktns; |
| 10682 | ngtcp2_pktns *hs_pktns = conn->hs_pktns; |
| 10683 | ngtcp2_tstamp earliest_loss_time; |
| 10684 | ngtcp2_pktns *loss_pktns = |
| 10685 | conn_get_earliest_pktns(conn, &earliest_loss_time, cstat->loss_time); |
| 10686 | ngtcp2_pktns *earliest_pktns; |
| 10687 | |
| 10688 | conn->log.last_ts = ts; |
| 10689 | conn->qlog.last_ts = ts; |
| 10690 | |
| 10691 | switch (conn->state) { |
| 10692 | case NGTCP2_CS_CLOSING: |
| 10693 | case NGTCP2_CS_DRAINING: |
| 10694 | cstat->loss_detection_timer = UINT64_MAX(18446744073709551615UL); |
| 10695 | cstat->pto_count = 0; |
| 10696 | return 0; |
| 10697 | default: |
| 10698 | break; |
| 10699 | } |
| 10700 | |
| 10701 | if (cstat->loss_detection_timer == UINT64_MAX(18446744073709551615UL)) { |
| 10702 | return 0; |
| 10703 | } |
| 10704 | |
| 10705 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, |
| 10706 | "loss detection timer fired"); |
| 10707 | |
| 10708 | if (earliest_loss_time != UINT64_MAX(18446744073709551615UL)) { |
| 10709 | rv = ngtcp2_conn_detect_lost_pkt(conn, loss_pktns, cstat, ts); |
| 10710 | if (rv != 0) { |
| 10711 | return rv; |
| 10712 | } |
| 10713 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 10714 | return 0; |
| 10715 | } |
| 10716 | |
| 10717 | if (!conn->server && !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01)) { |
| 10718 | if (hs_pktns->crypto.tx.ckm) { |
| 10719 | hs_pktns->rtb.probe_pkt_left = 1; |
| 10720 | } else { |
| 10721 | in_pktns->rtb.probe_pkt_left = 1; |
| 10722 | } |
| 10723 | } else { |
| 10724 | earliest_pktns = conn_get_earliest_pktns(conn, NULL((void*)0), cstat->last_tx_pkt_ts); |
| 10725 | |
| 10726 | assert(earliest_pktns)((void) (0)); |
| 10727 | |
| 10728 | switch (earliest_pktns->rtb.pktns_id) { |
| 10729 | case NGTCP2_PKTNS_ID_INITIAL: |
| 10730 | assert(in_pktns)((void) (0)); |
| 10731 | in_pktns->rtb.probe_pkt_left = 1; |
| 10732 | if (!conn->server) { |
| 10733 | break; |
| 10734 | } |
| 10735 | /* fall through for server so that it can coalesce packets. */ |
| 10736 | /* fall through */ |
| 10737 | case NGTCP2_PKTNS_ID_HANDSHAKE: |
| 10738 | assert(hs_pktns)((void) (0)); |
| 10739 | hs_pktns->rtb.probe_pkt_left = 1; |
| 10740 | break; |
| 10741 | case NGTCP2_PKTNS_ID_APPLICATION: |
| 10742 | conn->pktns.rtb.probe_pkt_left = 2; |
| 10743 | break; |
| 10744 | default: |
| 10745 | assert(0)((void) (0)); |
| 10746 | } |
| 10747 | } |
| 10748 | |
| 10749 | ++cstat->pto_count; |
| 10750 | |
| 10751 | ngtcp2_log_info(&conn->log, NGTCP2_LOG_EVENT_RCV, "pto_count=%zu", |
| 10752 | cstat->pto_count); |
| 10753 | |
| 10754 | ngtcp2_conn_set_loss_detection_timer(conn, ts); |
| 10755 | |
| 10756 | return 0; |
| 10757 | } |
| 10758 | |
| 10759 | int ngtcp2_conn_submit_crypto_data(ngtcp2_conn *conn, |
| 10760 | ngtcp2_crypto_level crypto_level, |
| 10761 | const uint8_t *data, const size_t datalen) { |
| 10762 | ngtcp2_pktns *pktns; |
| 10763 | ngtcp2_frame_chain *frc; |
| 10764 | ngtcp2_crypto *fr; |
| 10765 | int rv; |
| 10766 | |
| 10767 | if (datalen == 0) { |
| 10768 | return 0; |
| 10769 | } |
| 10770 | |
| 10771 | switch (crypto_level) { |
| 10772 | case NGTCP2_CRYPTO_LEVEL_INITIAL: |
| 10773 | assert(conn->in_pktns)((void) (0)); |
| 10774 | pktns = conn->in_pktns; |
| 10775 | break; |
| 10776 | case NGTCP2_CRYPTO_LEVEL_HANDSHAKE: |
| 10777 | assert(conn->hs_pktns)((void) (0)); |
| 10778 | pktns = conn->hs_pktns; |
| 10779 | break; |
| 10780 | case NGTCP2_CRYPTO_LEVEL_APPLICATION: |
| 10781 | pktns = &conn->pktns; |
| 10782 | break; |
| 10783 | default: |
| 10784 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 10785 | } |
| 10786 | |
| 10787 | rv = ngtcp2_frame_chain_new(&frc, conn->mem); |
| 10788 | if (rv != 0) { |
| 10789 | return rv; |
| 10790 | } |
| 10791 | |
| 10792 | fr = &frc->fr.crypto; |
| 10793 | |
| 10794 | fr->type = NGTCP2_FRAME_CRYPTO; |
| 10795 | fr->offset = pktns->crypto.tx.offset; |
| 10796 | fr->datacnt = 1; |
| 10797 | fr->data[0].len = datalen; |
| 10798 | fr->data[0].base = (uint8_t *)data; |
| 10799 | |
| 10800 | rv = ngtcp2_ksl_insert(&pktns->crypto.tx.frq, NULL((void*)0), &fr->offset, frc); |
| 10801 | if (rv != 0) { |
| 10802 | ngtcp2_frame_chain_del(frc, conn->mem); |
| 10803 | return rv; |
| 10804 | } |
| 10805 | |
| 10806 | pktns->crypto.strm.tx.offset += datalen; |
| 10807 | pktns->crypto.tx.offset += datalen; |
| 10808 | |
| 10809 | return 0; |
| 10810 | } |
| 10811 | |
| 10812 | int ngtcp2_conn_submit_new_token(ngtcp2_conn *conn, const uint8_t *token, |
| 10813 | size_t tokenlen) { |
| 10814 | int rv; |
| 10815 | ngtcp2_frame_chain *nfrc; |
| 10816 | uint8_t *p; |
| 10817 | |
| 10818 | assert(conn->server)((void) (0)); |
| 10819 | assert(token)((void) (0)); |
| 10820 | assert(tokenlen)((void) (0)); |
| 10821 | |
| 10822 | rv = ngtcp2_frame_chain_extralen_new(&nfrc, tokenlen, conn->mem); |
| 10823 | if (rv != 0) { |
| 10824 | return rv; |
| 10825 | } |
| 10826 | |
| 10827 | nfrc->fr.type = NGTCP2_FRAME_NEW_TOKEN; |
| 10828 | |
| 10829 | p = (uint8_t *)nfrc + sizeof(*nfrc); |
| 10830 | memcpy(p, token, tokenlen); |
| 10831 | |
| 10832 | ngtcp2_vec_init(&nfrc->fr.new_token.token, p, tokenlen); |
| 10833 | |
| 10834 | nfrc->next = conn->pktns.tx.frq; |
| 10835 | conn->pktns.tx.frq = nfrc; |
| 10836 | |
| 10837 | return 0; |
| 10838 | } |
| 10839 | |
| 10840 | ngtcp2_strm *ngtcp2_conn_tx_strmq_top(ngtcp2_conn *conn) { |
| 10841 | assert(!ngtcp2_pq_empty(&conn->tx.strmq))((void) (0)); |
| 10842 | return ngtcp2_struct_of(ngtcp2_pq_top(&conn->tx.strmq), ngtcp2_strm, pe)((ngtcp2_strm *)(void *)((char *)(ngtcp2_pq_top(&conn-> tx.strmq))-__builtin_offsetof(ngtcp2_strm, pe))); |
| 10843 | } |
| 10844 | |
| 10845 | void ngtcp2_conn_tx_strmq_pop(ngtcp2_conn *conn) { |
| 10846 | ngtcp2_strm *strm = ngtcp2_conn_tx_strmq_top(conn); |
| 10847 | assert(strm)((void) (0)); |
| 10848 | ngtcp2_pq_pop(&conn->tx.strmq); |
| 10849 | strm->pe.index = NGTCP2_PQ_BAD_INDEX(18446744073709551615UL); |
| 10850 | } |
| 10851 | |
| 10852 | int ngtcp2_conn_tx_strmq_push(ngtcp2_conn *conn, ngtcp2_strm *strm) { |
| 10853 | return ngtcp2_pq_push(&conn->tx.strmq, &strm->pe); |
| 10854 | } |
| 10855 | |
| 10856 | size_t ngtcp2_conn_get_num_scid(ngtcp2_conn *conn) { |
| 10857 | return ngtcp2_ksl_len(&conn->scid.set); |
| 10858 | } |
| 10859 | |
| 10860 | size_t ngtcp2_conn_get_scid(ngtcp2_conn *conn, ngtcp2_cid *dest) { |
| 10861 | ngtcp2_ksl_it it; |
| 10862 | ngtcp2_scid *scid; |
| 10863 | |
| 10864 | for (it = ngtcp2_ksl_begin(&conn->scid.set); !ngtcp2_ksl_it_end(&it)((&it)->blk->n == (&it)->i && (& it)->blk->next == ((void*)0)); |
| 10865 | ngtcp2_ksl_it_next(&it)(++(&it)->i == (&it)->blk->n && (& it)->blk->next ? ((&it)->blk = (&it)->blk ->next, (&it)->i = 0) : 0)) { |
| 10866 | scid = ngtcp2_ksl_it_get(&it); |
| 10867 | *dest++ = scid->cid; |
| 10868 | } |
| 10869 | |
| 10870 | return ngtcp2_ksl_len(&conn->scid.set); |
| 10871 | } |
| 10872 | |
| 10873 | size_t ngtcp2_conn_get_num_active_dcid(ngtcp2_conn *conn) { |
| 10874 | size_t n = 1; /* for conn->dcid.current */ |
| 10875 | ngtcp2_pv *pv = conn->pv; |
| 10876 | |
| 10877 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100)) { |
| 10878 | return 0; |
| 10879 | } |
| 10880 | |
| 10881 | if (pv) { |
| 10882 | if (pv->dcid.seq != conn->dcid.current.seq) { |
| 10883 | ++n; |
| 10884 | } |
| 10885 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 10886 | pv->fallback_dcid.seq != conn->dcid.current.seq && |
| 10887 | pv->fallback_dcid.seq != pv->dcid.seq) { |
| 10888 | ++n; |
| 10889 | } |
| 10890 | } |
| 10891 | |
| 10892 | n += ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len); |
| 10893 | |
| 10894 | return n; |
| 10895 | } |
| 10896 | |
| 10897 | static void copy_dcid_to_cid_token(ngtcp2_cid_token *dest, |
| 10898 | const ngtcp2_dcid *src) { |
| 10899 | dest->seq = src->seq; |
| 10900 | dest->cid = src->cid; |
| 10901 | ngtcp2_path_storage_init2(&dest->ps, &src->ps.path); |
| 10902 | dest->token_present = |
| 10903 | (uint8_t)!ngtcp2_check_invalid_stateless_reset_token(src->token); |
| 10904 | memcpy(dest->token, src->token, NGTCP2_STATELESS_RESET_TOKENLEN16); |
| 10905 | } |
| 10906 | |
| 10907 | size_t ngtcp2_conn_get_active_dcid(ngtcp2_conn *conn, ngtcp2_cid_token *dest) { |
| 10908 | ngtcp2_pv *pv = conn->pv; |
| 10909 | ngtcp2_cid_token *orig = dest; |
| 10910 | ngtcp2_dcid *dcid; |
| 10911 | size_t len, i; |
| 10912 | |
| 10913 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED_HANDLED0x0100)) { |
| 10914 | return 0; |
| 10915 | } |
| 10916 | |
| 10917 | copy_dcid_to_cid_token(dest, &conn->dcid.current); |
| 10918 | ++dest; |
| 10919 | |
| 10920 | if (pv) { |
| 10921 | if (pv->dcid.seq != conn->dcid.current.seq) { |
| 10922 | copy_dcid_to_cid_token(dest, &pv->dcid); |
| 10923 | ++dest; |
| 10924 | } |
| 10925 | if ((pv->flags & NGTCP2_PV_FLAG_FALLBACK_ON_FAILURE0x04) && |
| 10926 | pv->fallback_dcid.seq != conn->dcid.current.seq && |
| 10927 | pv->fallback_dcid.seq != pv->dcid.seq) { |
| 10928 | copy_dcid_to_cid_token(dest, &pv->fallback_dcid); |
| 10929 | ++dest; |
| 10930 | } |
| 10931 | } |
| 10932 | |
| 10933 | len = ngtcp2_ringbuf_len(&conn->dcid.retired)((&conn->dcid.retired)->len); |
| 10934 | for (i = 0; i < len; ++i) { |
| 10935 | dcid = ngtcp2_ringbuf_get(&conn->dcid.retired, i); |
| 10936 | copy_dcid_to_cid_token(dest, dcid); |
| 10937 | ++dest; |
| 10938 | } |
| 10939 | |
| 10940 | return (size_t)(dest - orig); |
| 10941 | } |
| 10942 | |
| 10943 | void ngtcp2_conn_set_local_addr(ngtcp2_conn *conn, const ngtcp2_addr *addr) { |
| 10944 | ngtcp2_addr *dest = &conn->dcid.current.ps.path.local; |
| 10945 | |
| 10946 | assert(addr->addrlen <= sizeof(conn->dcid.current.ps.local_addrbuf))((void) (0)); |
| 10947 | ngtcp2_addr_copy(dest, addr); |
| 10948 | } |
| 10949 | |
| 10950 | void ngtcp2_conn_set_remote_addr(ngtcp2_conn *conn, const ngtcp2_addr *addr) { |
| 10951 | ngtcp2_addr *dest = &conn->dcid.current.ps.path.remote; |
| 10952 | |
| 10953 | assert(addr->addrlen <= sizeof(conn->dcid.current.ps.remote_addrbuf))((void) (0)); |
| 10954 | ngtcp2_addr_copy(dest, addr); |
| 10955 | } |
| 10956 | |
| 10957 | const ngtcp2_path *ngtcp2_conn_get_path(ngtcp2_conn *conn) { |
| 10958 | return &conn->dcid.current.ps.path; |
| 10959 | } |
| 10960 | |
| 10961 | int ngtcp2_conn_initiate_migration(ngtcp2_conn *conn, const ngtcp2_path *path, |
| 10962 | ngtcp2_tstamp ts) { |
| 10963 | int rv; |
| 10964 | ngtcp2_dcid *dcid; |
| 10965 | |
| 10966 | assert(!conn->server)((void) (0)); |
| 10967 | |
| 10968 | conn->log.last_ts = ts; |
| 10969 | conn->qlog.last_ts = ts; |
| 10970 | |
| 10971 | if (conn->remote.transport_params.disable_active_migration || |
| 10972 | conn->dcid.current.cid.datalen == 0 || |
| 10973 | !(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_CONFIRMED0x80)) { |
| 10974 | return NGTCP2_ERR_INVALID_STATE-206; |
| 10975 | } |
| 10976 | if (ngtcp2_ringbuf_len(&conn->dcid.unused)((&conn->dcid.unused)->len) == 0) { |
| 10977 | return NGTCP2_ERR_CONN_ID_BLOCKED-237; |
| 10978 | } |
| 10979 | |
| 10980 | if (ngtcp2_path_eq(&conn->dcid.current.ps.path, path)) { |
| 10981 | return NGTCP2_ERR_INVALID_ARGUMENT-201; |
| 10982 | } |
| 10983 | |
| 10984 | dcid = ngtcp2_ringbuf_get(&conn->dcid.unused, 0); |
| 10985 | |
| 10986 | rv = conn_stop_pv(conn, ts); |
| 10987 | if (rv != 0) { |
| 10988 | return rv; |
| 10989 | } |
| 10990 | |
| 10991 | rv = conn_retire_dcid(conn, &conn->dcid.current, ts); |
| 10992 | if (rv != 0) { |
| 10993 | return rv; |
| 10994 | } |
| 10995 | |
| 10996 | ngtcp2_dcid_copy(&conn->dcid.current, dcid); |
| 10997 | ngtcp2_path_copy(&conn->dcid.current.ps.path, path); |
| 10998 | ngtcp2_ringbuf_pop_front(&conn->dcid.unused); |
| 10999 | |
| 11000 | rv = conn_call_activate_dcid(conn, &conn->dcid.current); |
| 11001 | if (rv != 0) { |
| 11002 | return rv; |
| 11003 | } |
| 11004 | |
| 11005 | conn_reset_congestion_state(conn); |
| 11006 | conn_reset_ecn_validation_state(conn); |
| 11007 | |
| 11008 | return 0; |
| 11009 | } |
| 11010 | |
| 11011 | uint64_t ngtcp2_conn_get_max_local_streams_uni(ngtcp2_conn *conn) { |
| 11012 | return conn->local.uni.max_streams; |
| 11013 | } |
| 11014 | |
| 11015 | uint64_t ngtcp2_conn_get_max_data_left(ngtcp2_conn *conn) { |
| 11016 | return conn->tx.max_offset - conn->tx.offset; |
| 11017 | } |
| 11018 | |
| 11019 | uint64_t ngtcp2_conn_get_streams_bidi_left(ngtcp2_conn *conn) { |
| 11020 | uint64_t n = ngtcp2_ord_stream_id(conn->local.bidi.next_stream_id); |
| 11021 | |
| 11022 | return n > conn->local.bidi.max_streams |
| 11023 | ? 0 |
| 11024 | : conn->local.bidi.max_streams - n + 1; |
| 11025 | } |
| 11026 | |
| 11027 | uint64_t ngtcp2_conn_get_streams_uni_left(ngtcp2_conn *conn) { |
| 11028 | uint64_t n = ngtcp2_ord_stream_id(conn->local.uni.next_stream_id); |
| 11029 | |
| 11030 | return n > conn->local.uni.max_streams ? 0 |
| 11031 | : conn->local.uni.max_streams - n + 1; |
| 11032 | } |
| 11033 | |
| 11034 | ngtcp2_tstamp ngtcp2_conn_get_idle_expiry(ngtcp2_conn *conn) { |
| 11035 | ngtcp2_duration trpto; |
| 11036 | ngtcp2_duration idle_timeout; |
| 11037 | |
| 11038 | /* TODO Remote max_idle_timeout becomes effective after handshake |
| 11039 | completion. */ |
| 11040 | |
| 11041 | if (!(conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) || |
| 11042 | conn->remote.transport_params.max_idle_timeout == 0 || |
| 11043 | (conn->local.transport_params.max_idle_timeout && |
| 11044 | conn->local.transport_params.max_idle_timeout < |
| 11045 | conn->remote.transport_params.max_idle_timeout)) { |
| 11046 | idle_timeout = conn->local.transport_params.max_idle_timeout; |
| 11047 | } else { |
| 11048 | idle_timeout = conn->remote.transport_params.max_idle_timeout; |
| 11049 | } |
| 11050 | |
| 11051 | if (idle_timeout == 0) { |
| 11052 | return UINT64_MAX(18446744073709551615UL); |
| 11053 | } |
| 11054 | |
| 11055 | trpto = 3 * conn_compute_pto( |
| 11056 | conn, (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) |
| 11057 | ? &conn->pktns |
| 11058 | : conn->hs_pktns); |
| 11059 | |
| 11060 | return conn->idle_ts + ngtcp2_max(idle_timeout, trpto)((idle_timeout) > (trpto) ? (idle_timeout) : (trpto)); |
| 11061 | } |
| 11062 | |
| 11063 | ngtcp2_duration ngtcp2_conn_get_pto(ngtcp2_conn *conn) { |
| 11064 | return conn_compute_pto(conn, |
| 11065 | (conn->flags & NGTCP2_CONN_FLAG_HANDSHAKE_COMPLETED0x01) |
| 11066 | ? &conn->pktns |
| 11067 | : conn->hs_pktns); |
| 11068 | } |
| 11069 | |
| 11070 | void ngtcp2_conn_set_initial_crypto_ctx(ngtcp2_conn *conn, |
| 11071 | const ngtcp2_crypto_ctx *ctx) { |
| 11072 | assert(conn->in_pktns)((void) (0)); |
| 11073 | conn->in_pktns->crypto.ctx = *ctx; |
| 11074 | } |
| 11075 | |
| 11076 | const ngtcp2_crypto_ctx *ngtcp2_conn_get_initial_crypto_ctx(ngtcp2_conn *conn) { |
| 11077 | assert(conn->in_pktns)((void) (0)); |
| 11078 | return &conn->in_pktns->crypto.ctx; |
| 11079 | } |
| 11080 | |
| 11081 | void ngtcp2_conn_set_retry_aead(ngtcp2_conn *conn, |
| 11082 | const ngtcp2_crypto_aead *aead, |
| 11083 | const ngtcp2_crypto_aead_ctx *aead_ctx) { |
| 11084 | assert(!conn->crypto.retry_aead_ctx.native_handle)((void) (0)); |
| 11085 | |
| 11086 | conn->crypto.retry_aead = *aead; |
| 11087 | conn->crypto.retry_aead_ctx = *aead_ctx; |
| 11088 | } |
| 11089 | |
| 11090 | void ngtcp2_conn_set_crypto_ctx(ngtcp2_conn *conn, |
| 11091 | const ngtcp2_crypto_ctx *ctx) { |
| 11092 | assert(conn->hs_pktns)((void) (0)); |
| 11093 | conn->hs_pktns->crypto.ctx = *ctx; |
| 11094 | conn->pktns.crypto.ctx = *ctx; |
| 11095 | } |
| 11096 | |
| 11097 | const ngtcp2_crypto_ctx *ngtcp2_conn_get_crypto_ctx(ngtcp2_conn *conn) { |
| 11098 | return &conn->pktns.crypto.ctx; |
| 11099 | } |
| 11100 | |
| 11101 | void ngtcp2_conn_set_early_crypto_ctx(ngtcp2_conn *conn, |
| 11102 | const ngtcp2_crypto_ctx *ctx) { |
| 11103 | conn->early.ctx = *ctx; |
| 11104 | } |
| 11105 | |
| 11106 | const ngtcp2_crypto_ctx *ngtcp2_conn_get_early_crypto_ctx(ngtcp2_conn *conn) { |
| 11107 | return &conn->early.ctx; |
| 11108 | } |
| 11109 | |
| 11110 | void *ngtcp2_conn_get_tls_native_handle(ngtcp2_conn *conn) { |
| 11111 | return conn->crypto.tls_native_handle; |
| 11112 | } |
| 11113 | |
| 11114 | void ngtcp2_conn_set_tls_native_handle(ngtcp2_conn *conn, |
| 11115 | void *tls_native_handle) { |
| 11116 | conn->crypto.tls_native_handle = tls_native_handle; |
| 11117 | } |
| 11118 | |
| 11119 | void ngtcp2_conn_get_connection_close_error_code( |
| 11120 | ngtcp2_conn *conn, ngtcp2_connection_close_error_code *ccec) { |
| 11121 | *ccec = conn->rx.ccec; |
| 11122 | } |
| 11123 | |
| 11124 | void ngtcp2_conn_set_tls_error(ngtcp2_conn *conn, int liberr) { |
| 11125 | conn->crypto.tls_error = liberr; |
| 11126 | } |
| 11127 | |
| 11128 | int ngtcp2_conn_get_tls_error(ngtcp2_conn *conn) { |
| 11129 | return conn->crypto.tls_error; |
| 11130 | } |
| 11131 | |
| 11132 | int ngtcp2_conn_is_local_stream(ngtcp2_conn *conn, int64_t stream_id) { |
| 11133 | return conn_local_stream(conn, stream_id); |
| 11134 | } |
| 11135 | |
| 11136 | int ngtcp2_conn_is_server(ngtcp2_conn *conn) { return conn->server; } |
| 11137 | |
| 11138 | int ngtcp2_conn_after_retry(ngtcp2_conn *conn) { |
| 11139 | return (conn->flags & NGTCP2_CONN_FLAG_RECV_RETRY0x10) != 0; |
| 11140 | } |
| 11141 | |
| 11142 | int ngtcp2_conn_set_stream_user_data(ngtcp2_conn *conn, int64_t stream_id, |
| 11143 | void *stream_user_data) { |
| 11144 | ngtcp2_strm *strm = ngtcp2_conn_find_stream(conn, stream_id); |
| 11145 | |
| 11146 | if (strm == NULL((void*)0)) { |
| 11147 | return NGTCP2_ERR_STREAM_NOT_FOUND-222; |
| 11148 | } |
| 11149 | |
| 11150 | strm->stream_user_data = stream_user_data; |
| 11151 | |
| 11152 | return 0; |
| 11153 | } |
| 11154 | |
| 11155 | void ngtcp2_path_challenge_entry_init(ngtcp2_path_challenge_entry *pcent, |
| 11156 | const ngtcp2_path *path, |
| 11157 | const uint8_t *data) { |
| 11158 | ngtcp2_path_storage_init2(&pcent->ps, path); |
| 11159 | memcpy(pcent->data, data, sizeof(pcent->data)); |
| 11160 | } |
| 11161 | |
| 11162 | void ngtcp2_settings_default(ngtcp2_settings *settings) { |
| 11163 | memset(settings, 0, sizeof(*settings)); |
| 11164 | settings->cc_algo = NGTCP2_CC_ALGO_CUBIC; |
| 11165 | settings->initial_rtt = NGTCP2_DEFAULT_INITIAL_RTT(333 * ((uint64_t)1000000ULL)); |
| 11166 | settings->ack_thresh = 2; |
| 11167 | } |
| 11168 | |
| 11169 | void ngtcp2_transport_params_default(ngtcp2_transport_params *params) { |
| 11170 | memset(params, 0, sizeof(*params)); |
| 11171 | params->max_udp_payload_size = NGTCP2_DEFAULT_MAX_UDP_PAYLOAD_SIZE65527; |
| 11172 | params->ack_delay_exponent = NGTCP2_DEFAULT_ACK_DELAY_EXPONENT3; |
| 11173 | params->max_ack_delay = NGTCP2_DEFAULT_MAX_ACK_DELAY(25 * ((uint64_t)1000000ULL)); |
| 11174 | params->active_connection_id_limit = |
| 11175 | NGTCP2_DEFAULT_ACTIVE_CONNECTION_ID_LIMIT2; |
| 11176 | } |
| 11177 | |
| 11178 | /* The functions prefixed with ngtcp2_pkt_ are usually put inside |
| 11179 | ngtcp2_pkt.c. This function uses encryption construct and uses |
| 11180 | test data defined only in ngtcp2_conn_test.c, so it is written |
| 11181 | here. */ |
| 11182 | ngtcp2_ssize ngtcp2_pkt_write_connection_close( |
| 11183 | uint8_t *dest, size_t destlen, uint32_t version, const ngtcp2_cid *dcid, |
| 11184 | const ngtcp2_cid *scid, uint64_t error_code, ngtcp2_encrypt encrypt, |
| 11185 | const ngtcp2_crypto_aead *aead, const ngtcp2_crypto_aead_ctx *aead_ctx, |
| 11186 | const uint8_t *iv, ngtcp2_hp_mask hp_mask, const ngtcp2_crypto_cipher *hp, |
| 11187 | const ngtcp2_crypto_cipher_ctx *hp_ctx) { |
| 11188 | ngtcp2_pkt_hd hd; |
| 11189 | ngtcp2_crypto_km ckm; |
| 11190 | ngtcp2_crypto_cc cc; |
| 11191 | ngtcp2_ppe ppe; |
| 11192 | ngtcp2_frame fr = {0}; |
| 11193 | int rv; |
| 11194 | |
| 11195 | ngtcp2_pkt_hd_init(&hd, NGTCP2_PKT_FLAG_LONG_FORM0x01, NGTCP2_PKT_INITIAL, dcid, |
| 11196 | scid, /* pkt_num = */ 0, /* pkt_numlen = */ 1, version, |
| 11197 | /* len = */ 0); |
| 11198 | |
| 11199 | ngtcp2_vec_init(&ckm.secret, NULL((void*)0), 0); |
| 11200 | ngtcp2_vec_init(&ckm.iv, iv, 12); |
| 11201 | ckm.aead_ctx = *aead_ctx; |
| 11202 | ckm.pkt_num = 0; |
| 11203 | ckm.flags = NGTCP2_CRYPTO_KM_FLAG_NONE0x00; |
| 11204 | |
| 11205 | cc.aead = *aead; |
| 11206 | cc.hp = *hp; |
| 11207 | cc.ckm = &ckm; |
| 11208 | cc.hp_ctx = *hp_ctx; |
| 11209 | cc.encrypt = encrypt; |
| 11210 | cc.hp_mask = hp_mask; |
| 11211 | |
| 11212 | ngtcp2_ppe_init(&ppe, dest, destlen, &cc); |
| 11213 | |
| 11214 | rv = ngtcp2_ppe_encode_hd(&ppe, &hd); |
| 11215 | if (rv != 0) { |
| 11216 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 11217 | return rv; |
| 11218 | } |
| 11219 | |
| 11220 | if (!ngtcp2_ppe_ensure_hp_sample(&ppe)) { |
| 11221 | return NGTCP2_ERR_NOBUF-203; |
| 11222 | } |
| 11223 | |
| 11224 | fr.type = NGTCP2_FRAME_CONNECTION_CLOSE; |
| 11225 | fr.connection_close.error_code = error_code; |
| 11226 | |
| 11227 | rv = ngtcp2_ppe_encode_frame(&ppe, &fr); |
| 11228 | if (rv != 0) { |
| 11229 | assert(NGTCP2_ERR_NOBUF == rv)((void) (0)); |
| 11230 | return rv; |
| 11231 | } |
| 11232 | |
| 11233 | return ngtcp2_ppe_final(&ppe, NULL((void*)0)); |
| 11234 | } |
| 11235 | |
| 11236 | int ngtcp2_is_bidi_stream(int64_t stream_id) { return bidi_stream(stream_id); } |