lsquic_engine.c revision 7f2bd84c
1/* Copyright (c) 2017 - 2018 LiteSpeed Technologies Inc. See LICENSE. */ 2/* 3 * lsquic_engine.c - QUIC engine 4 */ 5 6#include <assert.h> 7#include <errno.h> 8#include <inttypes.h> 9#include <stdint.h> 10#include <stdio.h> 11#include <stdlib.h> 12#include <string.h> 13#include <sys/queue.h> 14#include <time.h> 15#ifndef WIN32 16#include <sys/time.h> 17#include <netinet/in.h> 18#include <sys/types.h> 19#include <sys/stat.h> 20#include <fcntl.h> 21#include <unistd.h> 22#include <netdb.h> 23#endif 24 25 26 27#include "lsquic.h" 28#include "lsquic_types.h" 29#include "lsquic_alarmset.h" 30#include "lsquic_parse_common.h" 31#include "lsquic_parse.h" 32#include "lsquic_packet_in.h" 33#include "lsquic_packet_out.h" 34#include "lsquic_senhist.h" 35#include "lsquic_rtt.h" 36#include "lsquic_cubic.h" 37#include "lsquic_pacer.h" 38#include "lsquic_send_ctl.h" 39#include "lsquic_set.h" 40#include "lsquic_conn_flow.h" 41#include "lsquic_sfcw.h" 42#include "lsquic_stream.h" 43#include "lsquic_conn.h" 44#include "lsquic_full_conn.h" 45#include "lsquic_util.h" 46#include "lsquic_qtags.h" 47#include "lsquic_str.h" 48#include "lsquic_handshake.h" 49#include "lsquic_mm.h" 50#include "lsquic_conn_hash.h" 51#include "lsquic_engine_public.h" 52#include "lsquic_eng_hist.h" 53#include "lsquic_ev_log.h" 54#include "lsquic_version.h" 55#include "lsquic_hash.h" 56#include "lsquic_attq.h" 57#include "lsquic_min_heap.h" 58 59#define LSQUIC_LOGGER_MODULE LSQLM_ENGINE 60#include "lsquic_logger.h" 61 62 63/* The batch of outgoing packets grows and shrinks dynamically */ 64#define MAX_OUT_BATCH_SIZE 1024 65#define MIN_OUT_BATCH_SIZE 256 66#define INITIAL_OUT_BATCH_SIZE 512 67 68struct out_batch 69{ 70 lsquic_conn_t *conns [MAX_OUT_BATCH_SIZE]; 71 lsquic_packet_out_t *packets[MAX_OUT_BATCH_SIZE]; 72 struct lsquic_out_spec outs [MAX_OUT_BATCH_SIZE]; 73}; 74 75typedef struct lsquic_conn * (*conn_iter_f)(struct lsquic_engine *); 76 77static void 78process_connections (struct lsquic_engine *engine, conn_iter_f iter, 79 lsquic_time_t now); 80 81static void 82engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag); 83 84static lsquic_conn_t * 85engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 86 enum lsquic_conn_flags flag); 87 88static void 89force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn); 90 91/* Nested calls to LSQUIC are not supported */ 92#define ENGINE_IN(e) do { \ 93 assert(!((e)->pub.enp_flags & ENPUB_PROC)); \ 94 (e)->pub.enp_flags |= ENPUB_PROC; \ 95} while (0) 96 97#define ENGINE_OUT(e) do { \ 98 assert((e)->pub.enp_flags & ENPUB_PROC); \ 99 (e)->pub.enp_flags &= ~ENPUB_PROC; \ 100} while (0) 101 102/* A connection can be referenced from one of six places: 103 * 104 * 1. Connection hash: a connection starts its life in one of those. 105 * 106 * 2. Outgoing queue. 107 * 108 * 3. Tickable queue 109 * 110 * 4. Advisory Tick Time queue. 111 * 112 * 5. Closing connections queue. This is a transient queue -- it only 113 * exists for the duration of process_connections() function call. 114 * 115 * 6. Ticked connections queue. Another transient queue, similar to (5). 116 * 117 * The idea is to destroy the connection when it is no longer referenced. 118 * For example, a connection tick may return TICK_SEND|TICK_CLOSE. In 119 * that case, the connection is referenced from two places: (2) and (5). 120 * After its packets are sent, it is only referenced in (5), and at the 121 * end of the function call, when it is removed from (5), reference count 122 * goes to zero and the connection is destroyed. If not all packets can 123 * be sent, at the end of the function call, the connection is referenced 124 * by (2) and will only be removed once all outgoing packets have been 125 * sent. 126 */ 127#define CONN_REF_FLAGS (LSCONN_HASHED \ 128 |LSCONN_HAS_OUTGOING \ 129 |LSCONN_TICKABLE \ 130 |LSCONN_TICKED \ 131 |LSCONN_CLOSING \ 132 |LSCONN_ATTQ) 133 134 135 136 137struct lsquic_engine 138{ 139 struct lsquic_engine_public pub; 140 enum { 141 ENG_SERVER = LSENG_SERVER, 142 ENG_HTTP = LSENG_HTTP, 143 ENG_COOLDOWN = (1 << 7), /* Cooldown: no new connections */ 144 ENG_PAST_DEADLINE 145 = (1 << 8), /* Previous call to a processing 146 * function went past time threshold. 147 */ 148#ifndef NDEBUG 149 ENG_DTOR = (1 << 26), /* Engine destructor */ 150#endif 151 } flags; 152 const struct lsquic_stream_if *stream_if; 153 void *stream_if_ctx; 154 lsquic_packets_out_f packets_out; 155 void *packets_out_ctx; 156 void *bad_handshake_ctx; 157 struct conn_hash conns_hash; 158 struct min_heap conns_tickable; 159 struct min_heap conns_out; 160 struct eng_hist history; 161 unsigned batch_size; 162 struct attq *attq; 163 /* Track time last time a packet was sent to give new connections 164 * priority lower than that of existing connections. 165 */ 166 lsquic_time_t last_sent; 167 unsigned n_conns; 168 lsquic_time_t deadline; 169 struct out_batch out_batch; 170}; 171 172 173void 174lsquic_engine_init_settings (struct lsquic_engine_settings *settings, 175 unsigned flags) 176{ 177 memset(settings, 0, sizeof(*settings)); 178 settings->es_versions = LSQUIC_DF_VERSIONS; 179 if (flags & ENG_SERVER) 180 { 181 settings->es_cfcw = LSQUIC_DF_CFCW_SERVER; 182 settings->es_sfcw = LSQUIC_DF_SFCW_SERVER; 183 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_SERVER; 184 } 185 else 186 { 187 settings->es_cfcw = LSQUIC_DF_CFCW_CLIENT; 188 settings->es_sfcw = LSQUIC_DF_SFCW_CLIENT; 189 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_CLIENT; 190 } 191 settings->es_max_streams_in = LSQUIC_DF_MAX_STREAMS_IN; 192 settings->es_idle_conn_to = LSQUIC_DF_IDLE_CONN_TO; 193 settings->es_handshake_to = LSQUIC_DF_HANDSHAKE_TO; 194 settings->es_silent_close = LSQUIC_DF_SILENT_CLOSE; 195 settings->es_max_header_list_size 196 = LSQUIC_DF_MAX_HEADER_LIST_SIZE; 197 settings->es_ua = LSQUIC_DF_UA; 198 199 settings->es_pdmd = QTAG_X509; 200 settings->es_aead = QTAG_AESG; 201 settings->es_kexs = QTAG_C255; 202 settings->es_support_push = LSQUIC_DF_SUPPORT_PUSH; 203 settings->es_support_tcid0 = LSQUIC_DF_SUPPORT_TCID0; 204 settings->es_support_nstp = LSQUIC_DF_SUPPORT_NSTP; 205 settings->es_honor_prst = LSQUIC_DF_HONOR_PRST; 206 settings->es_progress_check = LSQUIC_DF_PROGRESS_CHECK; 207 settings->es_rw_once = LSQUIC_DF_RW_ONCE; 208 settings->es_proc_time_thresh= LSQUIC_DF_PROC_TIME_THRESH; 209 settings->es_pace_packets = LSQUIC_DF_PACE_PACKETS; 210} 211 212 213/* Note: if returning an error, err_buf must be valid if non-NULL */ 214int 215lsquic_engine_check_settings (const struct lsquic_engine_settings *settings, 216 unsigned flags, 217 char *err_buf, size_t err_buf_sz) 218{ 219 if (settings->es_cfcw < LSQUIC_MIN_FCW || 220 settings->es_sfcw < LSQUIC_MIN_FCW) 221 { 222 if (err_buf) 223 snprintf(err_buf, err_buf_sz, "%s", 224 "flow control window set too low"); 225 return -1; 226 } 227 if (0 == (settings->es_versions & LSQUIC_SUPPORTED_VERSIONS)) 228 { 229 if (err_buf) 230 snprintf(err_buf, err_buf_sz, "%s", 231 "No supported QUIC versions specified"); 232 return -1; 233 } 234 if (settings->es_versions & ~LSQUIC_SUPPORTED_VERSIONS) 235 { 236 if (err_buf) 237 snprintf(err_buf, err_buf_sz, "%s", 238 "one or more unsupported QUIC version is specified"); 239 return -1; 240 } 241 return 0; 242} 243 244 245static void 246free_packet (void *ctx, unsigned char *packet_data) 247{ 248 free(packet_data); 249} 250 251 252static void * 253malloc_buf (void *ctx, size_t size) 254{ 255 return malloc(size); 256} 257 258 259static const struct lsquic_packout_mem_if stock_pmi = 260{ 261 malloc_buf, (void(*)(void *, void *)) free_packet, 262}; 263 264 265static int 266hash_conns_by_addr (const struct lsquic_engine *engine) 267{ 268 if (engine->pub.enp_settings.es_versions & LSQUIC_FORCED_TCID0_VERSIONS) 269 return 1; 270 if ((engine->pub.enp_settings.es_versions & LSQUIC_GQUIC_HEADER_VERSIONS) 271 && engine->pub.enp_settings.es_support_tcid0) 272 return 1; 273 return 0; 274} 275 276 277lsquic_engine_t * 278lsquic_engine_new (unsigned flags, 279 const struct lsquic_engine_api *api) 280{ 281 lsquic_engine_t *engine; 282 int tag_buf_len; 283 char err_buf[100]; 284 285 if (!api->ea_packets_out) 286 { 287 LSQ_ERROR("packets_out callback is not specified"); 288 return NULL; 289 } 290 291 if (api->ea_settings && 292 0 != lsquic_engine_check_settings(api->ea_settings, flags, 293 err_buf, sizeof(err_buf))) 294 { 295 LSQ_ERROR("cannot create engine: %s", err_buf); 296 return NULL; 297 } 298 299 engine = calloc(1, sizeof(*engine)); 300 if (!engine) 301 return NULL; 302 if (0 != lsquic_mm_init(&engine->pub.enp_mm)) 303 { 304 free(engine); 305 return NULL; 306 } 307 if (api->ea_settings) 308 engine->pub.enp_settings = *api->ea_settings; 309 else 310 lsquic_engine_init_settings(&engine->pub.enp_settings, flags); 311 tag_buf_len = lsquic_gen_ver_tags(engine->pub.enp_ver_tags_buf, 312 sizeof(engine->pub.enp_ver_tags_buf), 313 engine->pub.enp_settings.es_versions); 314 if (tag_buf_len <= 0) 315 { 316 LSQ_ERROR("cannot generate version tags buffer"); 317 free(engine); 318 return NULL; 319 } 320 engine->pub.enp_ver_tags_len = tag_buf_len; 321 engine->pub.enp_flags = ENPUB_CAN_SEND; 322 323 engine->flags = flags; 324 engine->stream_if = api->ea_stream_if; 325 engine->stream_if_ctx = api->ea_stream_if_ctx; 326 engine->packets_out = api->ea_packets_out; 327 engine->packets_out_ctx = api->ea_packets_out_ctx; 328 if (api->ea_pmi) 329 { 330 engine->pub.enp_pmi = api->ea_pmi; 331 engine->pub.enp_pmi_ctx = api->ea_pmi_ctx; 332 } 333 else 334 { 335 engine->pub.enp_pmi = &stock_pmi; 336 engine->pub.enp_pmi_ctx = NULL; 337 } 338 engine->pub.enp_verify_cert = api->ea_verify_cert; 339 engine->pub.enp_verify_ctx = api->ea_verify_ctx; 340 engine->pub.enp_engine = engine; 341 conn_hash_init(&engine->conns_hash, 342 hash_conns_by_addr(engine) ? CHF_USE_ADDR : 0); 343 engine->attq = attq_create(); 344 eng_hist_init(&engine->history); 345 engine->batch_size = INITIAL_OUT_BATCH_SIZE; 346 347 348 LSQ_INFO("instantiated engine"); 349 return engine; 350} 351 352 353static void 354grow_batch_size (struct lsquic_engine *engine) 355{ 356 engine->batch_size <<= engine->batch_size < MAX_OUT_BATCH_SIZE; 357} 358 359 360static void 361shrink_batch_size (struct lsquic_engine *engine) 362{ 363 engine->batch_size >>= engine->batch_size > MIN_OUT_BATCH_SIZE; 364} 365 366 367/* Wrapper to make sure important things occur before the connection is 368 * really destroyed. 369 */ 370static void 371destroy_conn (struct lsquic_engine *engine, lsquic_conn_t *conn) 372{ 373 --engine->n_conns; 374 conn->cn_flags |= LSCONN_NEVER_TICKABLE; 375 conn->cn_if->ci_destroy(conn); 376} 377 378 379static int 380maybe_grow_conn_heaps (struct lsquic_engine *engine) 381{ 382 struct min_heap_elem *els; 383 unsigned count; 384 385 if (engine->n_conns < lsquic_mh_nalloc(&engine->conns_tickable)) 386 return 0; /* Nothing to do */ 387 388 if (lsquic_mh_nalloc(&engine->conns_tickable)) 389 count = lsquic_mh_nalloc(&engine->conns_tickable) * 2 * 2; 390 else 391 count = 8; 392 393 els = malloc(sizeof(els[0]) * count); 394 if (!els) 395 { 396 LSQ_ERROR("%s: malloc failed", __func__); 397 return -1; 398 } 399 400 LSQ_DEBUG("grew heaps to %u elements", count / 2); 401 memcpy(&els[0], engine->conns_tickable.mh_elems, 402 sizeof(els[0]) * lsquic_mh_count(&engine->conns_tickable)); 403 memcpy(&els[count / 2], engine->conns_out.mh_elems, 404 sizeof(els[0]) * lsquic_mh_count(&engine->conns_out)); 405 free(engine->conns_tickable.mh_elems); 406 engine->conns_tickable.mh_elems = els; 407 engine->conns_out.mh_elems = &els[count / 2]; 408 engine->conns_tickable.mh_nalloc = count / 2; 409 engine->conns_out.mh_nalloc = count / 2; 410 return 0; 411} 412 413 414static lsquic_conn_t * 415new_full_conn_client (lsquic_engine_t *engine, const char *hostname, 416 unsigned short max_packet_size) 417{ 418 lsquic_conn_t *conn; 419 unsigned flags; 420 if (0 != maybe_grow_conn_heaps(engine)) 421 return NULL; 422 flags = engine->flags & (ENG_SERVER|ENG_HTTP); 423 conn = full_conn_client_new(&engine->pub, engine->stream_if, 424 engine->stream_if_ctx, flags, hostname, max_packet_size); 425 if (!conn) 426 return NULL; 427 ++engine->n_conns; 428 return conn; 429} 430 431 432static lsquic_conn_t * 433find_conn (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 434 struct packin_parse_state *ppstate, const struct sockaddr *sa_local) 435{ 436 lsquic_conn_t *conn; 437 438 if (conn_hash_using_addr(&engine->conns_hash)) 439 conn = conn_hash_find_by_addr(&engine->conns_hash, sa_local); 440 else if (packet_in->pi_flags & PI_CONN_ID) 441 conn = conn_hash_find_by_cid(&engine->conns_hash, 442 packet_in->pi_conn_id); 443 else 444 { 445 LSQ_DEBUG("packet header does not have connection ID: discarding"); 446 return NULL; 447 } 448 449 if (!conn) 450 return NULL; 451 452 conn->cn_pf->pf_parse_packet_in_finish(packet_in, ppstate); 453 if ((packet_in->pi_flags & PI_CONN_ID) 454 && conn->cn_cid != packet_in->pi_conn_id) 455 { 456 LSQ_DEBUG("connection IDs do not match"); 457 return NULL; 458 } 459 460 return conn; 461} 462 463 464#if !defined(NDEBUG) && __GNUC__ 465__attribute__((weak)) 466#endif 467void 468lsquic_engine_add_conn_to_tickable (struct lsquic_engine_public *enpub, 469 lsquic_conn_t *conn) 470{ 471 if (0 == (enpub->enp_flags & ENPUB_PROC) && 472 0 == (conn->cn_flags & (LSCONN_TICKABLE|LSCONN_NEVER_TICKABLE))) 473 { 474 lsquic_engine_t *engine = (lsquic_engine_t *) enpub; 475 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 476 engine_incref_conn(conn, LSCONN_TICKABLE); 477 } 478} 479 480 481void 482lsquic_engine_add_conn_to_attq (struct lsquic_engine_public *enpub, 483 lsquic_conn_t *conn, lsquic_time_t tick_time) 484{ 485 lsquic_engine_t *const engine = (lsquic_engine_t *) enpub; 486 if (conn->cn_flags & LSCONN_TICKABLE) 487 { 488 /* Optimization: no need to add the connection to the Advisory Tick 489 * Time Queue: it is about to be ticked, after which it its next tick 490 * time may be queried again. 491 */; 492 } 493 else if (conn->cn_flags & LSCONN_ATTQ) 494 { 495 if (lsquic_conn_adv_time(conn) != tick_time) 496 { 497 attq_remove(engine->attq, conn); 498 if (0 != attq_add(engine->attq, conn, tick_time)) 499 engine_decref_conn(engine, conn, LSCONN_ATTQ); 500 } 501 } 502 else if (0 == attq_add(engine->attq, conn, tick_time)) 503 engine_incref_conn(conn, LSCONN_ATTQ); 504} 505 506 507/* Return 0 if packet is being processed by a connections, otherwise return 1 */ 508static int 509process_packet_in (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 510 struct packin_parse_state *ppstate, const struct sockaddr *sa_local, 511 const struct sockaddr *sa_peer, void *peer_ctx) 512{ 513 lsquic_conn_t *conn; 514 515 if (lsquic_packet_in_is_gquic_prst(packet_in) 516 && !engine->pub.enp_settings.es_honor_prst) 517 { 518 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 519 LSQ_DEBUG("public reset packet: discarding"); 520 return 1; 521 } 522 523 conn = find_conn(engine, packet_in, ppstate, sa_local); 524 525 if (!conn) 526 { 527 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 528 return 1; 529 } 530 531 if (0 == (conn->cn_flags & LSCONN_TICKABLE)) 532 { 533 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 534 engine_incref_conn(conn, LSCONN_TICKABLE); 535 } 536 lsquic_conn_record_sockaddr(conn, sa_local, sa_peer); 537 lsquic_packet_in_upref(packet_in); 538 conn->cn_peer_ctx = peer_ctx; 539 conn->cn_if->ci_packet_in(conn, packet_in); 540 lsquic_packet_in_put(&engine->pub.enp_mm, packet_in); 541 return 0; 542} 543 544 545void 546lsquic_engine_destroy (lsquic_engine_t *engine) 547{ 548 lsquic_conn_t *conn; 549 550 LSQ_DEBUG("destroying engine"); 551#ifndef NDEBUG 552 engine->flags |= ENG_DTOR; 553#endif 554 555 while ((conn = lsquic_mh_pop(&engine->conns_out))) 556 { 557 assert(conn->cn_flags & LSCONN_HAS_OUTGOING); 558 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 559 } 560 561 while ((conn = lsquic_mh_pop(&engine->conns_tickable))) 562 { 563 assert(conn->cn_flags & LSCONN_TICKABLE); 564 (void) engine_decref_conn(engine, conn, LSCONN_TICKABLE); 565 } 566 567 for (conn = conn_hash_first(&engine->conns_hash); conn; 568 conn = conn_hash_next(&engine->conns_hash)) 569 force_close_conn(engine, conn); 570 conn_hash_cleanup(&engine->conns_hash); 571 572 assert(0 == engine->n_conns); 573 attq_destroy(engine->attq); 574 575 assert(0 == lsquic_mh_count(&engine->conns_out)); 576 assert(0 == lsquic_mh_count(&engine->conns_tickable)); 577 free(engine->conns_tickable.mh_elems); 578 free(engine); 579} 580 581 582lsquic_conn_t * 583lsquic_engine_connect (lsquic_engine_t *engine, const struct sockaddr *local_sa, 584 const struct sockaddr *peer_sa, 585 void *peer_ctx, lsquic_conn_ctx_t *conn_ctx, 586 const char *hostname, unsigned short max_packet_size) 587{ 588 lsquic_conn_t *conn; 589 ENGINE_IN(engine); 590 591 if (engine->flags & ENG_SERVER) 592 { 593 LSQ_ERROR("`%s' must only be called in client mode", __func__); 594 goto err; 595 } 596 597 if (conn_hash_using_addr(&engine->conns_hash) 598 && conn_hash_find_by_addr(&engine->conns_hash, local_sa)) 599 { 600 LSQ_ERROR("cannot have more than one connection on the same port"); 601 goto err; 602 } 603 604 if (0 == max_packet_size) 605 { 606 switch (peer_sa->sa_family) 607 { 608 case AF_INET: 609 max_packet_size = QUIC_MAX_IPv4_PACKET_SZ; 610 break; 611 default: 612 max_packet_size = QUIC_MAX_IPv6_PACKET_SZ; 613 break; 614 } 615 } 616 617 conn = new_full_conn_client(engine, hostname, max_packet_size); 618 if (!conn) 619 goto err; 620 lsquic_conn_record_sockaddr(conn, local_sa, peer_sa); 621 if (0 != conn_hash_add(&engine->conns_hash, conn)) 622 { 623 LSQ_WARN("cannot add connection %"PRIu64" to hash - destroy", 624 conn->cn_cid); 625 destroy_conn(engine, conn); 626 goto err; 627 } 628 assert(!(conn->cn_flags & 629 (CONN_REF_FLAGS 630 & ~LSCONN_TICKABLE /* This flag may be set as effect of user 631 callbacks */ 632 ))); 633 conn->cn_flags |= LSCONN_HASHED; 634 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 635 engine_incref_conn(conn, LSCONN_TICKABLE); 636 conn->cn_peer_ctx = peer_ctx; 637 lsquic_conn_set_ctx(conn, conn_ctx); 638 full_conn_client_call_on_new(conn); 639 end: 640 ENGINE_OUT(engine); 641 return conn; 642 err: 643 conn = NULL; 644 goto end; 645} 646 647 648static void 649remove_conn_from_hash (lsquic_engine_t *engine, lsquic_conn_t *conn) 650{ 651 conn_hash_remove(&engine->conns_hash, conn); 652 (void) engine_decref_conn(engine, conn, LSCONN_HASHED); 653} 654 655 656static void 657refflags2str (enum lsquic_conn_flags flags, char s[6]) 658{ 659 *s = 'C'; s += !!(flags & LSCONN_CLOSING); 660 *s = 'H'; s += !!(flags & LSCONN_HASHED); 661 *s = 'O'; s += !!(flags & LSCONN_HAS_OUTGOING); 662 *s = 'T'; s += !!(flags & LSCONN_TICKABLE); 663 *s = 'A'; s += !!(flags & LSCONN_ATTQ); 664 *s = 'K'; s += !!(flags & LSCONN_TICKED); 665 *s = '\0'; 666} 667 668 669static void 670engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag) 671{ 672 char str[2][7]; 673 assert(flag & CONN_REF_FLAGS); 674 assert(!(conn->cn_flags & flag)); 675 conn->cn_flags |= flag; 676 LSQ_DEBUG("incref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 677 (refflags2str(conn->cn_flags & ~flag, str[0]), str[0]), 678 (refflags2str(conn->cn_flags, str[1]), str[1])); 679} 680 681 682static lsquic_conn_t * 683engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 684 enum lsquic_conn_flags flags) 685{ 686 char str[2][7]; 687 assert(flags & CONN_REF_FLAGS); 688 assert(conn->cn_flags & flags); 689#ifndef NDEBUG 690 if (flags & LSCONN_CLOSING) 691 assert(0 == (conn->cn_flags & LSCONN_HASHED)); 692#endif 693 conn->cn_flags &= ~flags; 694 LSQ_DEBUG("decref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 695 (refflags2str(conn->cn_flags | flags, str[0]), str[0]), 696 (refflags2str(conn->cn_flags, str[1]), str[1])); 697 if (0 == (conn->cn_flags & CONN_REF_FLAGS)) 698 { 699 eng_hist_inc(&engine->history, 0, sl_del_full_conns); 700 destroy_conn(engine, conn); 701 return NULL; 702 } 703 else 704 return conn; 705} 706 707 708/* This is not a general-purpose function. Only call from engine dtor. */ 709static void 710force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn) 711{ 712 assert(engine->flags & ENG_DTOR); 713 const enum lsquic_conn_flags flags = conn->cn_flags; 714 assert(conn->cn_flags & CONN_REF_FLAGS); 715 assert(!(flags & LSCONN_HAS_OUTGOING)); /* Should be removed already */ 716 assert(!(flags & LSCONN_TICKABLE)); /* Should be removed already */ 717 assert(!(flags & LSCONN_CLOSING)); /* It is in transient queue? */ 718 if (flags & LSCONN_ATTQ) 719 { 720 attq_remove(engine->attq, conn); 721 (void) engine_decref_conn(engine, conn, LSCONN_ATTQ); 722 } 723 if (flags & LSCONN_HASHED) 724 remove_conn_from_hash(engine, conn); 725} 726 727 728/* Iterator for tickable connections (those on the Tickable Queue). Before 729 * a connection is returned, it is removed from the Advisory Tick Time queue 730 * if necessary. 731 */ 732static lsquic_conn_t * 733conn_iter_next_tickable (struct lsquic_engine *engine) 734{ 735 lsquic_conn_t *conn; 736 737 conn = lsquic_mh_pop(&engine->conns_tickable); 738 739 if (conn) 740 conn = engine_decref_conn(engine, conn, LSCONN_TICKABLE); 741 if (conn && (conn->cn_flags & LSCONN_ATTQ)) 742 { 743 attq_remove(engine->attq, conn); 744 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 745 } 746 747 return conn; 748} 749 750 751void 752lsquic_engine_process_conns (lsquic_engine_t *engine) 753{ 754 lsquic_conn_t *conn; 755 lsquic_time_t now; 756 757 ENGINE_IN(engine); 758 759 now = lsquic_time_now(); 760 while ((conn = attq_pop(engine->attq, now))) 761 { 762 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 763 if (conn && !(conn->cn_flags & LSCONN_TICKABLE)) 764 { 765 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 766 engine_incref_conn(conn, LSCONN_TICKABLE); 767 } 768 } 769 770 process_connections(engine, conn_iter_next_tickable, now); 771 ENGINE_OUT(engine); 772} 773 774 775static ssize_t 776really_encrypt_packet (const lsquic_conn_t *conn, 777 struct lsquic_packet_out *packet_out, 778 unsigned char *buf, size_t bufsz) 779{ 780 int header_sz, is_hello_packet; 781 enum enc_level enc_level; 782 size_t packet_sz; 783 unsigned char header_buf[QUIC_MAX_PUBHDR_SZ]; 784 785 header_sz = conn->cn_pf->pf_gen_reg_pkt_header(conn, packet_out, 786 header_buf, sizeof(header_buf)); 787 if (header_sz < 0) 788 return -1; 789 790 is_hello_packet = !!(packet_out->po_flags & PO_HELLO); 791 enc_level = conn->cn_esf->esf_encrypt(conn->cn_enc_session, 792 conn->cn_version, 0, 793 packet_out->po_packno, header_buf, header_sz, 794 packet_out->po_data, packet_out->po_data_sz, 795 buf, bufsz, &packet_sz, is_hello_packet); 796 if ((int) enc_level >= 0) 797 { 798 lsquic_packet_out_set_enc_level(packet_out, enc_level); 799 LSQ_DEBUG("encrypted packet %"PRIu64"; plaintext is %zu bytes, " 800 "ciphertext is %zd bytes", 801 packet_out->po_packno, 802 conn->cn_pf->pf_packout_header_size(conn, packet_out->po_flags) + 803 packet_out->po_data_sz, 804 packet_sz); 805 return packet_sz; 806 } 807 else 808 return -1; 809} 810 811 812static enum { ENCPA_OK, ENCPA_NOMEM, ENCPA_BADCRYPT, } 813encrypt_packet (lsquic_engine_t *engine, const lsquic_conn_t *conn, 814 lsquic_packet_out_t *packet_out) 815{ 816 ssize_t enc_sz; 817 size_t bufsz; 818 unsigned sent_sz; 819 unsigned char *buf; 820 821 bufsz = conn->cn_pf->pf_packout_header_size(conn, packet_out->po_flags) + 822 packet_out->po_data_sz + QUIC_PACKET_HASH_SZ; 823 buf = engine->pub.enp_pmi->pmi_allocate(engine->pub.enp_pmi_ctx, bufsz); 824 if (!buf) 825 { 826 LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd", 827 bufsz); 828 return ENCPA_NOMEM; 829 } 830 831 { 832 enc_sz = really_encrypt_packet(conn, packet_out, buf, bufsz); 833 sent_sz = enc_sz; 834 } 835 836 if (enc_sz < 0) 837 { 838 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, buf); 839 return ENCPA_BADCRYPT; 840 } 841 842 packet_out->po_enc_data = buf; 843 packet_out->po_enc_data_sz = enc_sz; 844 packet_out->po_sent_sz = sent_sz; 845 packet_out->po_flags |= PO_ENCRYPTED|PO_SENT_SZ; 846 847 return ENCPA_OK; 848} 849 850 851STAILQ_HEAD(conns_stailq, lsquic_conn); 852TAILQ_HEAD(conns_tailq, lsquic_conn); 853 854 855struct conns_out_iter 856{ 857 struct min_heap *coi_heap; 858 TAILQ_HEAD(, lsquic_conn) coi_active_list, 859 coi_inactive_list; 860 lsquic_conn_t *coi_next; 861#ifndef NDEBUG 862 lsquic_time_t coi_last_sent; 863#endif 864}; 865 866 867static void 868coi_init (struct conns_out_iter *iter, struct lsquic_engine *engine) 869{ 870 iter->coi_heap = &engine->conns_out; 871 iter->coi_next = NULL; 872 TAILQ_INIT(&iter->coi_active_list); 873 TAILQ_INIT(&iter->coi_inactive_list); 874#ifndef NDEBUG 875 iter->coi_last_sent = 0; 876#endif 877} 878 879 880static lsquic_conn_t * 881coi_next (struct conns_out_iter *iter) 882{ 883 lsquic_conn_t *conn; 884 885 if (lsquic_mh_count(iter->coi_heap) > 0) 886 { 887 conn = lsquic_mh_pop(iter->coi_heap); 888 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 889 conn->cn_flags |= LSCONN_COI_ACTIVE; 890#ifndef NDEBUG 891 if (iter->coi_last_sent) 892 assert(iter->coi_last_sent <= conn->cn_last_sent); 893 iter->coi_last_sent = conn->cn_last_sent; 894#endif 895 return conn; 896 } 897 else if (!TAILQ_EMPTY(&iter->coi_active_list)) 898 { 899 conn = iter->coi_next; 900 if (!conn) 901 conn = TAILQ_FIRST(&iter->coi_active_list); 902 if (conn) 903 iter->coi_next = TAILQ_NEXT(conn, cn_next_out); 904 return conn; 905 } 906 else 907 return NULL; 908} 909 910 911static void 912coi_deactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 913{ 914 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 915 { 916 assert(!TAILQ_EMPTY(&iter->coi_active_list)); 917 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 918 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 919 TAILQ_INSERT_TAIL(&iter->coi_inactive_list, conn, cn_next_out); 920 conn->cn_flags |= LSCONN_COI_INACTIVE; 921 } 922} 923 924 925static void 926coi_reactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 927{ 928 assert(conn->cn_flags & LSCONN_COI_INACTIVE); 929 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 930 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 931 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 932 conn->cn_flags |= LSCONN_COI_ACTIVE; 933} 934 935 936static void 937coi_reheap (struct conns_out_iter *iter, lsquic_engine_t *engine) 938{ 939 lsquic_conn_t *conn; 940 while ((conn = TAILQ_FIRST(&iter->coi_active_list))) 941 { 942 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 943 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 944 lsquic_mh_insert(iter->coi_heap, conn, conn->cn_last_sent); 945 } 946 while ((conn = TAILQ_FIRST(&iter->coi_inactive_list))) 947 { 948 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 949 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 950 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 951 } 952} 953 954 955static unsigned 956send_batch (lsquic_engine_t *engine, struct conns_out_iter *conns_iter, 957 struct out_batch *batch, unsigned n_to_send) 958{ 959 int n_sent, i; 960 lsquic_time_t now; 961 962 /* Set sent time before the write to avoid underestimating RTT */ 963 now = lsquic_time_now(); 964 for (i = 0; i < (int) n_to_send; ++i) 965 batch->packets[i]->po_sent = now; 966 n_sent = engine->packets_out(engine->packets_out_ctx, batch->outs, 967 n_to_send); 968 if (n_sent >= 0) 969 LSQ_DEBUG("packets out returned %d (out of %u)", n_sent, n_to_send); 970 else 971 { 972 engine->pub.enp_flags &= ~ENPUB_CAN_SEND; 973 LSQ_DEBUG("packets out returned an error: %s", strerror(errno)); 974 EV_LOG_GENERIC_EVENT("cannot send packets"); 975 n_sent = 0; 976 } 977 if (n_sent > 0) 978 engine->last_sent = now + n_sent; 979 for (i = 0; i < n_sent; ++i) 980 { 981 eng_hist_inc(&engine->history, now, sl_packets_out); 982 EV_LOG_PACKET_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 983 batch->conns[i]->cn_if->ci_packet_sent(batch->conns[i], 984 batch->packets[i]); 985 /* `i' is added to maintain relative order */ 986 batch->conns[i]->cn_last_sent = now + i; 987 /* Release packet out buffer as soon as the packet is sent 988 * successfully. If not successfully sent, we hold on to 989 * this buffer until the packet sending is attempted again 990 * or until it times out and regenerated. 991 */ 992 if (batch->packets[i]->po_flags & PO_ENCRYPTED) 993 { 994 batch->packets[i]->po_flags &= ~PO_ENCRYPTED; 995 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, 996 batch->packets[i]->po_enc_data); 997 batch->packets[i]->po_enc_data = NULL; /* JIC */ 998 } 999 } 1000 if (LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_EVENT)) 1001 for ( ; i < (int) n_to_send; ++i) 1002 EV_LOG_PACKET_NOT_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 1003 /* Return packets to the connection in reverse order so that the packet 1004 * ordering is maintained. 1005 */ 1006 for (i = (int) n_to_send - 1; i >= n_sent; --i) 1007 { 1008 batch->conns[i]->cn_if->ci_packet_not_sent(batch->conns[i], 1009 batch->packets[i]); 1010 if (!(batch->conns[i]->cn_flags & (LSCONN_COI_ACTIVE|LSCONN_EVANESCENT))) 1011 coi_reactivate(conns_iter, batch->conns[i]); 1012 } 1013 return n_sent; 1014} 1015 1016 1017/* Return 1 if went past deadline, 0 otherwise */ 1018static int 1019check_deadline (lsquic_engine_t *engine) 1020{ 1021 if (engine->pub.enp_settings.es_proc_time_thresh && 1022 lsquic_time_now() > engine->deadline) 1023 { 1024 LSQ_INFO("went past threshold of %u usec, stop sending", 1025 engine->pub.enp_settings.es_proc_time_thresh); 1026 engine->flags |= ENG_PAST_DEADLINE; 1027 return 1; 1028 } 1029 else 1030 return 0; 1031} 1032 1033 1034static void 1035send_packets_out (struct lsquic_engine *engine, 1036 struct conns_tailq *ticked_conns, 1037 struct conns_stailq *closed_conns) 1038{ 1039 unsigned n, w, n_sent, n_batches_sent; 1040 lsquic_packet_out_t *packet_out; 1041 lsquic_conn_t *conn; 1042 struct out_batch *const batch = &engine->out_batch; 1043 struct conns_out_iter conns_iter; 1044 int shrink, deadline_exceeded; 1045 1046 coi_init(&conns_iter, engine); 1047 n_batches_sent = 0; 1048 n_sent = 0, n = 0; 1049 shrink = 0; 1050 deadline_exceeded = 0; 1051 1052 while ((conn = coi_next(&conns_iter))) 1053 { 1054 packet_out = conn->cn_if->ci_next_packet_to_send(conn); 1055 if (!packet_out) { 1056 LSQ_DEBUG("batched all outgoing packets for conn %"PRIu64, 1057 conn->cn_cid); 1058 coi_deactivate(&conns_iter, conn); 1059 continue; 1060 } 1061 if (!(packet_out->po_flags & (PO_ENCRYPTED|PO_NOENCRYPT))) 1062 { 1063 switch (encrypt_packet(engine, conn, packet_out)) 1064 { 1065 case ENCPA_NOMEM: 1066 /* Send what we have and wait for a more opportune moment */ 1067 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1068 goto end_for; 1069 case ENCPA_BADCRYPT: 1070 /* This is pretty bad: close connection immediately */ 1071 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1072 LSQ_INFO("conn %"PRIu64" has unsendable packets", conn->cn_cid); 1073 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 1074 { 1075 if (!(conn->cn_flags & LSCONN_CLOSING)) 1076 { 1077 STAILQ_INSERT_TAIL(closed_conns, conn, cn_next_closed_conn); 1078 engine_incref_conn(conn, LSCONN_CLOSING); 1079 if (conn->cn_flags & LSCONN_HASHED) 1080 remove_conn_from_hash(engine, conn); 1081 } 1082 coi_deactivate(&conns_iter, conn); 1083 if (conn->cn_flags & LSCONN_TICKED) 1084 { 1085 TAILQ_REMOVE(ticked_conns, conn, cn_next_ticked); 1086 engine_decref_conn(engine, conn, LSCONN_TICKED); 1087 } 1088 } 1089 continue; 1090 case ENCPA_OK: 1091 break; 1092 } 1093 } 1094 LSQ_DEBUG("batched packet %"PRIu64" for connection %"PRIu64, 1095 packet_out->po_packno, conn->cn_cid); 1096 assert(conn->cn_flags & LSCONN_HAS_PEER_SA); 1097 if (packet_out->po_flags & PO_ENCRYPTED) 1098 { 1099 batch->outs[n].buf = packet_out->po_enc_data; 1100 batch->outs[n].sz = packet_out->po_enc_data_sz; 1101 } 1102 else 1103 { 1104 batch->outs[n].buf = packet_out->po_data; 1105 batch->outs[n].sz = packet_out->po_data_sz; 1106 } 1107 batch->outs [n].peer_ctx = conn->cn_peer_ctx; 1108 batch->outs [n].local_sa = (struct sockaddr *) conn->cn_local_addr; 1109 batch->outs [n].dest_sa = (struct sockaddr *) conn->cn_peer_addr; 1110 batch->conns [n] = conn; 1111 batch->packets[n] = packet_out; 1112 ++n; 1113 if (n == engine->batch_size) 1114 { 1115 n = 0; 1116 w = send_batch(engine, &conns_iter, batch, engine->batch_size); 1117 ++n_batches_sent; 1118 n_sent += w; 1119 if (w < engine->batch_size) 1120 { 1121 shrink = 1; 1122 break; 1123 } 1124 deadline_exceeded = check_deadline(engine); 1125 if (deadline_exceeded) 1126 break; 1127 grow_batch_size(engine); 1128 } 1129 } 1130 end_for: 1131 1132 if (n > 0) { 1133 w = send_batch(engine, &conns_iter, batch, n); 1134 n_sent += w; 1135 shrink = w < n; 1136 ++n_batches_sent; 1137 deadline_exceeded = check_deadline(engine); 1138 } 1139 1140 if (shrink) 1141 shrink_batch_size(engine); 1142 else if (n_batches_sent > 1 && !deadline_exceeded) 1143 grow_batch_size(engine); 1144 1145 coi_reheap(&conns_iter, engine); 1146 1147 LSQ_DEBUG("%s: sent %u packet%.*s", __func__, n_sent, n_sent != 1, "s"); 1148} 1149 1150 1151int 1152lsquic_engine_has_unsent_packets (lsquic_engine_t *engine) 1153{ 1154 return lsquic_mh_count(&engine->conns_out) > 0 1155 ; 1156} 1157 1158 1159static void 1160reset_deadline (lsquic_engine_t *engine, lsquic_time_t now) 1161{ 1162 engine->deadline = now + engine->pub.enp_settings.es_proc_time_thresh; 1163 engine->flags &= ~ENG_PAST_DEADLINE; 1164} 1165 1166 1167/* TODO: this is a user-facing function, account for load */ 1168void 1169lsquic_engine_send_unsent_packets (lsquic_engine_t *engine) 1170{ 1171 lsquic_conn_t *conn; 1172 struct conns_stailq closed_conns; 1173 struct conns_tailq ticked_conns = TAILQ_HEAD_INITIALIZER(ticked_conns); 1174 1175 STAILQ_INIT(&closed_conns); 1176 reset_deadline(engine, lsquic_time_now()); 1177 if (!(engine->pub.enp_flags & ENPUB_CAN_SEND)) 1178 { 1179 LSQ_DEBUG("can send again"); 1180 EV_LOG_GENERIC_EVENT("can send again"); 1181 engine->pub.enp_flags |= ENPUB_CAN_SEND; 1182 } 1183 1184 send_packets_out(engine, &ticked_conns, &closed_conns); 1185 1186 while ((conn = STAILQ_FIRST(&closed_conns))) { 1187 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1188 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1189 } 1190 1191} 1192 1193 1194static void 1195process_connections (lsquic_engine_t *engine, conn_iter_f next_conn, 1196 lsquic_time_t now) 1197{ 1198 lsquic_conn_t *conn; 1199 enum tick_st tick_st; 1200 unsigned i; 1201 lsquic_time_t next_tick_time; 1202 struct conns_stailq closed_conns; 1203 struct conns_tailq ticked_conns; 1204 1205 eng_hist_tick(&engine->history, now); 1206 1207 STAILQ_INIT(&closed_conns); 1208 TAILQ_INIT(&ticked_conns); 1209 reset_deadline(engine, now); 1210 1211 i = 0; 1212 while ((conn = next_conn(engine)) 1213 ) 1214 { 1215 tick_st = conn->cn_if->ci_tick(conn, now); 1216 conn->cn_last_ticked = now + i /* Maintain relative order */ ++; 1217 if (tick_st & TICK_SEND) 1218 { 1219 if (!(conn->cn_flags & LSCONN_HAS_OUTGOING)) 1220 { 1221 lsquic_mh_insert(&engine->conns_out, conn, conn->cn_last_sent); 1222 engine_incref_conn(conn, LSCONN_HAS_OUTGOING); 1223 } 1224 } 1225 if (tick_st & TICK_CLOSE) 1226 { 1227 STAILQ_INSERT_TAIL(&closed_conns, conn, cn_next_closed_conn); 1228 engine_incref_conn(conn, LSCONN_CLOSING); 1229 if (conn->cn_flags & LSCONN_HASHED) 1230 remove_conn_from_hash(engine, conn); 1231 } 1232 else 1233 { 1234 TAILQ_INSERT_TAIL(&ticked_conns, conn, cn_next_ticked); 1235 engine_incref_conn(conn, LSCONN_TICKED); 1236 } 1237 } 1238 1239 if ((engine->pub.enp_flags & ENPUB_CAN_SEND) 1240 && lsquic_engine_has_unsent_packets(engine)) 1241 send_packets_out(engine, &ticked_conns, &closed_conns); 1242 1243 while ((conn = STAILQ_FIRST(&closed_conns))) { 1244 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1245 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1246 } 1247 1248 /* TODO Heapification can be optimized by switching to the Floyd method: 1249 * https://en.wikipedia.org/wiki/Binary_heap#Building_a_heap 1250 */ 1251 while ((conn = TAILQ_FIRST(&ticked_conns))) 1252 { 1253 TAILQ_REMOVE(&ticked_conns, conn, cn_next_ticked); 1254 engine_decref_conn(engine, conn, LSCONN_TICKED); 1255 if (!(conn->cn_flags & LSCONN_TICKABLE) 1256 && conn->cn_if->ci_is_tickable(conn)) 1257 { 1258 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 1259 engine_incref_conn(conn, LSCONN_TICKABLE); 1260 } 1261 else if (!(conn->cn_flags & LSCONN_ATTQ)) 1262 { 1263 next_tick_time = conn->cn_if->ci_next_tick_time(conn); 1264 if (next_tick_time) 1265 { 1266 if (0 == attq_add(engine->attq, conn, next_tick_time)) 1267 engine_incref_conn(conn, LSCONN_ATTQ); 1268 } 1269 else 1270 assert(0); 1271 } 1272 } 1273 1274} 1275 1276 1277/* Return 0 if packet is being processed by a real connection, 1 if the 1278 * packet was processed, but not by a connection, and -1 on error. 1279 */ 1280int 1281lsquic_engine_packet_in (lsquic_engine_t *engine, 1282 const unsigned char *packet_in_data, size_t packet_in_size, 1283 const struct sockaddr *sa_local, const struct sockaddr *sa_peer, 1284 void *peer_ctx) 1285{ 1286 struct packin_parse_state ppstate; 1287 lsquic_packet_in_t *packet_in; 1288 int (*parse_packet_in_begin) (struct lsquic_packet_in *, size_t length, 1289 int is_server, struct packin_parse_state *); 1290 1291 if (packet_in_size > QUIC_MAX_PACKET_SZ) 1292 { 1293 LSQ_DEBUG("Cannot handle packet_in_size(%zd) > %d packet incoming " 1294 "packet's header", packet_in_size, QUIC_MAX_PACKET_SZ); 1295 errno = E2BIG; 1296 return -1; 1297 } 1298 1299 if (conn_hash_using_addr(&engine->conns_hash)) 1300 { 1301 const struct lsquic_conn *conn; 1302 conn = conn_hash_find_by_addr(&engine->conns_hash, sa_local); 1303 if (!conn) 1304 return -1; 1305 if ((1 << conn->cn_version) & LSQUIC_GQUIC_HEADER_VERSIONS) 1306 parse_packet_in_begin = lsquic_gquic_parse_packet_in_begin; 1307 else 1308 parse_packet_in_begin = lsquic_iquic_parse_packet_in_begin; 1309 } 1310 else 1311 parse_packet_in_begin = lsquic_parse_packet_in_begin; 1312 1313 packet_in = lsquic_mm_get_packet_in(&engine->pub.enp_mm); 1314 if (!packet_in) 1315 return -1; 1316 1317 /* Library does not modify packet_in_data, it is not referenced after 1318 * this function returns and subsequent release of pi_data is guarded 1319 * by PI_OWN_DATA flag. 1320 */ 1321 packet_in->pi_data = (unsigned char *) packet_in_data; 1322 if (0 != parse_packet_in_begin(packet_in, packet_in_size, 1323 engine->flags & ENG_SERVER, &ppstate)) 1324 { 1325 LSQ_DEBUG("Cannot parse incoming packet's header"); 1326 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 1327 errno = EINVAL; 1328 return -1; 1329 } 1330 1331 packet_in->pi_received = lsquic_time_now(); 1332 eng_hist_inc(&engine->history, packet_in->pi_received, sl_packets_in); 1333 return process_packet_in(engine, packet_in, &ppstate, sa_local, sa_peer, 1334 peer_ctx); 1335} 1336 1337 1338#if __GNUC__ && !defined(NDEBUG) 1339__attribute__((weak)) 1340#endif 1341unsigned 1342lsquic_engine_quic_versions (const lsquic_engine_t *engine) 1343{ 1344 return engine->pub.enp_settings.es_versions; 1345} 1346 1347 1348int 1349lsquic_engine_earliest_adv_tick (lsquic_engine_t *engine, int *diff) 1350{ 1351 const lsquic_time_t *next_time; 1352 lsquic_time_t now; 1353 1354 if (((engine->flags & ENG_PAST_DEADLINE) 1355 && lsquic_mh_count(&engine->conns_out)) 1356 || lsquic_mh_count(&engine->conns_tickable)) 1357 { 1358 *diff = 0; 1359 return 1; 1360 } 1361 1362 next_time = attq_next_time(engine->attq); 1363 if (!next_time) 1364 return 0; 1365 1366 now = lsquic_time_now(); 1367 *diff = (int) ((int64_t) *next_time - (int64_t) now); 1368 return 1; 1369} 1370 1371 1372unsigned 1373lsquic_engine_count_attq (lsquic_engine_t *engine, int from_now) 1374{ 1375 lsquic_time_t now; 1376 now = lsquic_time_now(); 1377 if (from_now < 0) 1378 now -= from_now; 1379 else 1380 now += from_now; 1381 return attq_count_before(engine->attq, now); 1382} 1383