lsquic_engine.c revision e98f5deb
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.h" 31#include "lsquic_packet_in.h" 32#include "lsquic_packet_out.h" 33#include "lsquic_senhist.h" 34#include "lsquic_rtt.h" 35#include "lsquic_cubic.h" 36#include "lsquic_pacer.h" 37#include "lsquic_send_ctl.h" 38#include "lsquic_set.h" 39#include "lsquic_conn_flow.h" 40#include "lsquic_sfcw.h" 41#include "lsquic_stream.h" 42#include "lsquic_conn.h" 43#include "lsquic_full_conn.h" 44#include "lsquic_util.h" 45#include "lsquic_qtags.h" 46#include "lsquic_str.h" 47#include "lsquic_handshake.h" 48#include "lsquic_mm.h" 49#include "lsquic_conn_hash.h" 50#include "lsquic_engine_public.h" 51#include "lsquic_eng_hist.h" 52#include "lsquic_ev_log.h" 53#include "lsquic_version.h" 54#include "lsquic_hash.h" 55#include "lsquic_attq.h" 56#include "lsquic_min_heap.h" 57 58#define LSQUIC_LOGGER_MODULE LSQLM_ENGINE 59#include "lsquic_logger.h" 60 61 62/* The batch of outgoing packets grows and shrinks dynamically */ 63#define MAX_OUT_BATCH_SIZE 1024 64#define MIN_OUT_BATCH_SIZE 256 65#define INITIAL_OUT_BATCH_SIZE 512 66 67struct out_batch 68{ 69 lsquic_conn_t *conns [MAX_OUT_BATCH_SIZE]; 70 lsquic_packet_out_t *packets[MAX_OUT_BATCH_SIZE]; 71 struct lsquic_out_spec outs [MAX_OUT_BATCH_SIZE]; 72}; 73 74typedef struct lsquic_conn * (*conn_iter_f)(struct lsquic_engine *); 75 76static void 77process_connections (struct lsquic_engine *engine, conn_iter_f iter, 78 lsquic_time_t now); 79 80static void 81engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag); 82 83static lsquic_conn_t * 84engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 85 enum lsquic_conn_flags flag); 86 87static void 88force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn); 89 90/* Nested calls to LSQUIC are not supported */ 91#define ENGINE_IN(e) do { \ 92 assert(!((e)->pub.enp_flags & ENPUB_PROC)); \ 93 (e)->pub.enp_flags |= ENPUB_PROC; \ 94} while (0) 95 96#define ENGINE_OUT(e) do { \ 97 assert((e)->pub.enp_flags & ENPUB_PROC); \ 98 (e)->pub.enp_flags &= ~ENPUB_PROC; \ 99} while (0) 100 101/* A connection can be referenced from one of six places: 102 * 103 * 1. Connection hash: a connection starts its life in one of those. 104 * 105 * 2. Outgoing queue. 106 * 107 * 3. Tickable queue 108 * 109 * 4. Advisory Tick Time queue. 110 * 111 * 5. Closing connections queue. This is a transient queue -- it only 112 * exists for the duration of process_connections() function call. 113 * 114 * 6. Ticked connections queue. Another transient queue, similar to (5). 115 * 116 * The idea is to destroy the connection when it is no longer referenced. 117 * For example, a connection tick may return TICK_SEND|TICK_CLOSE. In 118 * that case, the connection is referenced from two places: (2) and (5). 119 * After its packets are sent, it is only referenced in (5), and at the 120 * end of the function call, when it is removed from (5), reference count 121 * goes to zero and the connection is destroyed. If not all packets can 122 * be sent, at the end of the function call, the connection is referenced 123 * by (2) and will only be removed once all outgoing packets have been 124 * sent. 125 */ 126#define CONN_REF_FLAGS (LSCONN_HASHED \ 127 |LSCONN_HAS_OUTGOING \ 128 |LSCONN_TICKABLE \ 129 |LSCONN_TICKED \ 130 |LSCONN_CLOSING \ 131 |LSCONN_ATTQ) 132 133 134 135 136struct lsquic_engine 137{ 138 struct lsquic_engine_public pub; 139 enum { 140 ENG_SERVER = LSENG_SERVER, 141 ENG_HTTP = LSENG_HTTP, 142 ENG_COOLDOWN = (1 << 7), /* Cooldown: no new connections */ 143 ENG_PAST_DEADLINE 144 = (1 << 8), /* Previous call to a processing 145 * function went past time threshold. 146 */ 147#ifndef NDEBUG 148 ENG_DTOR = (1 << 26), /* Engine destructor */ 149#endif 150 } flags; 151 const struct lsquic_stream_if *stream_if; 152 void *stream_if_ctx; 153 lsquic_packets_out_f packets_out; 154 void *packets_out_ctx; 155 void *bad_handshake_ctx; 156 struct conn_hash conns_hash; 157 struct min_heap conns_tickable; 158 struct min_heap conns_out; 159 struct eng_hist history; 160 unsigned batch_size; 161 struct attq *attq; 162 /* Track time last time a packet was sent to give new connections 163 * priority lower than that of existing connections. 164 */ 165 lsquic_time_t last_sent; 166 unsigned n_conns; 167 lsquic_time_t deadline; 168 struct out_batch out_batch; 169}; 170 171 172void 173lsquic_engine_init_settings (struct lsquic_engine_settings *settings, 174 unsigned flags) 175{ 176 memset(settings, 0, sizeof(*settings)); 177 settings->es_versions = LSQUIC_DF_VERSIONS; 178 if (flags & ENG_SERVER) 179 { 180 settings->es_cfcw = LSQUIC_DF_CFCW_SERVER; 181 settings->es_sfcw = LSQUIC_DF_SFCW_SERVER; 182 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_SERVER; 183 } 184 else 185 { 186 settings->es_cfcw = LSQUIC_DF_CFCW_CLIENT; 187 settings->es_sfcw = LSQUIC_DF_SFCW_CLIENT; 188 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_CLIENT; 189 } 190 settings->es_max_streams_in = LSQUIC_DF_MAX_STREAMS_IN; 191 settings->es_idle_conn_to = LSQUIC_DF_IDLE_CONN_TO; 192 settings->es_handshake_to = LSQUIC_DF_HANDSHAKE_TO; 193 settings->es_silent_close = LSQUIC_DF_SILENT_CLOSE; 194 settings->es_max_header_list_size 195 = LSQUIC_DF_MAX_HEADER_LIST_SIZE; 196 settings->es_ua = LSQUIC_DF_UA; 197 198 settings->es_pdmd = QTAG_X509; 199 settings->es_aead = QTAG_AESG; 200 settings->es_kexs = QTAG_C255; 201 settings->es_support_push = LSQUIC_DF_SUPPORT_PUSH; 202 settings->es_support_tcid0 = LSQUIC_DF_SUPPORT_TCID0; 203 settings->es_support_nstp = LSQUIC_DF_SUPPORT_NSTP; 204 settings->es_honor_prst = LSQUIC_DF_HONOR_PRST; 205 settings->es_progress_check = LSQUIC_DF_PROGRESS_CHECK; 206 settings->es_rw_once = LSQUIC_DF_RW_ONCE; 207 settings->es_proc_time_thresh= LSQUIC_DF_PROC_TIME_THRESH; 208 settings->es_pace_packets = LSQUIC_DF_PACE_PACKETS; 209} 210 211 212/* Note: if returning an error, err_buf must be valid if non-NULL */ 213int 214lsquic_engine_check_settings (const struct lsquic_engine_settings *settings, 215 unsigned flags, 216 char *err_buf, size_t err_buf_sz) 217{ 218 if (settings->es_cfcw < LSQUIC_MIN_FCW || 219 settings->es_sfcw < LSQUIC_MIN_FCW) 220 { 221 if (err_buf) 222 snprintf(err_buf, err_buf_sz, "%s", 223 "flow control window set too low"); 224 return -1; 225 } 226 if (0 == (settings->es_versions & LSQUIC_SUPPORTED_VERSIONS)) 227 { 228 if (err_buf) 229 snprintf(err_buf, err_buf_sz, "%s", 230 "No supported QUIC versions specified"); 231 return -1; 232 } 233 if (settings->es_versions & ~LSQUIC_SUPPORTED_VERSIONS) 234 { 235 if (err_buf) 236 snprintf(err_buf, err_buf_sz, "%s", 237 "one or more unsupported QUIC version is specified"); 238 return -1; 239 } 240 return 0; 241} 242 243 244static void 245free_packet (void *ctx, unsigned char *packet_data) 246{ 247 free(packet_data); 248} 249 250 251static void * 252malloc_buf (void *ctx, size_t size) 253{ 254 return malloc(size); 255} 256 257 258static const struct lsquic_packout_mem_if stock_pmi = 259{ 260 malloc_buf, (void(*)(void *, void *)) free_packet, 261}; 262 263 264lsquic_engine_t * 265lsquic_engine_new (unsigned flags, 266 const struct lsquic_engine_api *api) 267{ 268 lsquic_engine_t *engine; 269 int tag_buf_len; 270 char err_buf[100]; 271 272 if (!api->ea_packets_out) 273 { 274 LSQ_ERROR("packets_out callback is not specified"); 275 return NULL; 276 } 277 278 if (api->ea_settings && 279 0 != lsquic_engine_check_settings(api->ea_settings, flags, 280 err_buf, sizeof(err_buf))) 281 { 282 LSQ_ERROR("cannot create engine: %s", err_buf); 283 return NULL; 284 } 285 286 engine = calloc(1, sizeof(*engine)); 287 if (!engine) 288 return NULL; 289 if (0 != lsquic_mm_init(&engine->pub.enp_mm)) 290 { 291 free(engine); 292 return NULL; 293 } 294 if (api->ea_settings) 295 engine->pub.enp_settings = *api->ea_settings; 296 else 297 lsquic_engine_init_settings(&engine->pub.enp_settings, flags); 298 tag_buf_len = gen_ver_tags(engine->pub.enp_ver_tags_buf, 299 sizeof(engine->pub.enp_ver_tags_buf), 300 engine->pub.enp_settings.es_versions); 301 if (tag_buf_len <= 0) 302 { 303 LSQ_ERROR("cannot generate version tags buffer"); 304 free(engine); 305 return NULL; 306 } 307 engine->pub.enp_ver_tags_len = tag_buf_len; 308 engine->pub.enp_flags = ENPUB_CAN_SEND; 309 310 engine->flags = flags; 311 engine->stream_if = api->ea_stream_if; 312 engine->stream_if_ctx = api->ea_stream_if_ctx; 313 engine->packets_out = api->ea_packets_out; 314 engine->packets_out_ctx = api->ea_packets_out_ctx; 315 if (api->ea_pmi) 316 { 317 engine->pub.enp_pmi = api->ea_pmi; 318 engine->pub.enp_pmi_ctx = api->ea_pmi_ctx; 319 } 320 else 321 { 322 engine->pub.enp_pmi = &stock_pmi; 323 engine->pub.enp_pmi_ctx = NULL; 324 } 325 engine->pub.enp_engine = engine; 326 conn_hash_init(&engine->conns_hash); 327 engine->attq = attq_create(); 328 eng_hist_init(&engine->history); 329 engine->batch_size = INITIAL_OUT_BATCH_SIZE; 330 331 332 LSQ_INFO("instantiated engine"); 333 return engine; 334} 335 336 337static void 338grow_batch_size (struct lsquic_engine *engine) 339{ 340 engine->batch_size <<= engine->batch_size < MAX_OUT_BATCH_SIZE; 341} 342 343 344static void 345shrink_batch_size (struct lsquic_engine *engine) 346{ 347 engine->batch_size >>= engine->batch_size > MIN_OUT_BATCH_SIZE; 348} 349 350 351/* Wrapper to make sure important things occur before the connection is 352 * really destroyed. 353 */ 354static void 355destroy_conn (struct lsquic_engine *engine, lsquic_conn_t *conn) 356{ 357 --engine->n_conns; 358 conn->cn_flags |= LSCONN_NEVER_TICKABLE; 359 conn->cn_if->ci_destroy(conn); 360} 361 362 363static int 364maybe_grow_conn_heaps (struct lsquic_engine *engine) 365{ 366 struct min_heap_elem *els; 367 unsigned count; 368 369 if (engine->n_conns < lsquic_mh_nalloc(&engine->conns_tickable)) 370 return 0; /* Nothing to do */ 371 372 if (lsquic_mh_nalloc(&engine->conns_tickable)) 373 count = lsquic_mh_nalloc(&engine->conns_tickable) * 2 * 2; 374 else 375 count = 8; 376 377 els = malloc(sizeof(els[0]) * count); 378 if (!els) 379 { 380 LSQ_ERROR("%s: malloc failed", __func__); 381 return -1; 382 } 383 384 LSQ_DEBUG("grew heaps to %u elements", count / 2); 385 memcpy(&els[0], engine->conns_tickable.mh_elems, 386 sizeof(els[0]) * lsquic_mh_count(&engine->conns_tickable)); 387 memcpy(&els[count / 2], engine->conns_out.mh_elems, 388 sizeof(els[0]) * lsquic_mh_count(&engine->conns_out)); 389 free(engine->conns_tickable.mh_elems); 390 engine->conns_tickable.mh_elems = els; 391 engine->conns_out.mh_elems = &els[count / 2]; 392 engine->conns_tickable.mh_nalloc = count / 2; 393 engine->conns_out.mh_nalloc = count / 2; 394 return 0; 395} 396 397 398static lsquic_conn_t * 399new_full_conn_client (lsquic_engine_t *engine, const char *hostname, 400 unsigned short max_packet_size) 401{ 402 lsquic_conn_t *conn; 403 unsigned flags; 404 if (0 != maybe_grow_conn_heaps(engine)) 405 return NULL; 406 flags = engine->flags & (ENG_SERVER|ENG_HTTP); 407 conn = full_conn_client_new(&engine->pub, engine->stream_if, 408 engine->stream_if_ctx, flags, hostname, max_packet_size); 409 if (!conn) 410 return NULL; 411 ++engine->n_conns; 412 if (0 != conn_hash_add(&engine->conns_hash, conn)) 413 { 414 LSQ_WARN("cannot add connection %"PRIu64" to hash - destroy", 415 conn->cn_cid); 416 destroy_conn(engine, conn); 417 return NULL; 418 } 419 assert(!(conn->cn_flags & 420 (CONN_REF_FLAGS 421 & ~LSCONN_TICKABLE /* This flag may be set as effect of user 422 callbacks */ 423 ))); 424 conn->cn_flags |= LSCONN_HASHED; 425 return conn; 426} 427 428 429static lsquic_conn_t * 430find_or_create_conn (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 431 struct packin_parse_state *ppstate, const struct sockaddr *sa_peer, 432 void *peer_ctx) 433{ 434 lsquic_conn_t *conn; 435 436 if (lsquic_packet_in_is_prst(packet_in) 437 && !engine->pub.enp_settings.es_honor_prst) 438 { 439 LSQ_DEBUG("public reset packet: discarding"); 440 return NULL; 441 } 442 443 if (!(packet_in->pi_flags & PI_CONN_ID)) 444 { 445 LSQ_DEBUG("packet header does not have connection ID: discarding"); 446 return NULL; 447 } 448 449 conn = conn_hash_find(&engine->conns_hash, packet_in->pi_conn_id); 450 if (conn) 451 { 452 conn->cn_pf->pf_parse_packet_in_finish(packet_in, ppstate); 453 return conn; 454 } 455 456 return conn; 457} 458 459 460#if !defined(NDEBUG) && __GNUC__ 461__attribute__((weak)) 462#endif 463void 464lsquic_engine_add_conn_to_tickable (struct lsquic_engine_public *enpub, 465 lsquic_conn_t *conn) 466{ 467 if (0 == (enpub->enp_flags & ENPUB_PROC) && 468 0 == (conn->cn_flags & (LSCONN_TICKABLE|LSCONN_NEVER_TICKABLE))) 469 { 470 lsquic_engine_t *engine = (lsquic_engine_t *) enpub; 471 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 472 engine_incref_conn(conn, LSCONN_TICKABLE); 473 } 474} 475 476 477void 478lsquic_engine_add_conn_to_attq (struct lsquic_engine_public *enpub, 479 lsquic_conn_t *conn, lsquic_time_t tick_time) 480{ 481 lsquic_engine_t *const engine = (lsquic_engine_t *) enpub; 482 if (conn->cn_flags & LSCONN_TICKABLE) 483 { 484 /* Optimization: no need to add the connection to the Advisory Tick 485 * Time Queue: it is about to be ticked, after which it its next tick 486 * time may be queried again. 487 */; 488 } 489 else if (conn->cn_flags & LSCONN_ATTQ) 490 { 491 if (lsquic_conn_adv_time(conn) != tick_time) 492 { 493 attq_remove(engine->attq, conn); 494 if (0 != attq_add(engine->attq, conn, tick_time)) 495 engine_decref_conn(engine, conn, LSCONN_ATTQ); 496 } 497 } 498 else if (0 == attq_add(engine->attq, conn, tick_time)) 499 engine_incref_conn(conn, LSCONN_ATTQ); 500} 501 502 503/* Return 0 if packet is being processed by a connections, otherwise return 1 */ 504static int 505process_packet_in (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 506 struct packin_parse_state *ppstate, const struct sockaddr *sa_local, 507 const struct sockaddr *sa_peer, void *peer_ctx) 508{ 509 lsquic_conn_t *conn; 510 511 conn = find_or_create_conn(engine, packet_in, ppstate, sa_peer, peer_ctx); 512 if (!conn) 513 { 514 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 515 return 1; 516 } 517 518 if (0 == (conn->cn_flags & LSCONN_TICKABLE)) 519 { 520 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 521 engine_incref_conn(conn, LSCONN_TICKABLE); 522 } 523 lsquic_conn_record_sockaddr(conn, sa_local, sa_peer); 524 lsquic_packet_in_upref(packet_in); 525 conn->cn_peer_ctx = peer_ctx; 526 conn->cn_if->ci_packet_in(conn, packet_in); 527 lsquic_packet_in_put(&engine->pub.enp_mm, packet_in); 528 return 0; 529} 530 531 532void 533lsquic_engine_destroy (lsquic_engine_t *engine) 534{ 535 lsquic_conn_t *conn; 536 537 LSQ_DEBUG("destroying engine"); 538#ifndef NDEBUG 539 engine->flags |= ENG_DTOR; 540#endif 541 542 while ((conn = lsquic_mh_pop(&engine->conns_out))) 543 { 544 assert(conn->cn_flags & LSCONN_HAS_OUTGOING); 545 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 546 } 547 548 while ((conn = lsquic_mh_pop(&engine->conns_tickable))) 549 { 550 assert(conn->cn_flags & LSCONN_TICKABLE); 551 (void) engine_decref_conn(engine, conn, LSCONN_TICKABLE); 552 } 553 554 for (conn = conn_hash_first(&engine->conns_hash); conn; 555 conn = conn_hash_next(&engine->conns_hash)) 556 force_close_conn(engine, conn); 557 conn_hash_cleanup(&engine->conns_hash); 558 559 assert(0 == engine->n_conns); 560 attq_destroy(engine->attq); 561 562 assert(0 == lsquic_mh_count(&engine->conns_out)); 563 assert(0 == lsquic_mh_count(&engine->conns_tickable)); 564 free(engine->conns_tickable.mh_elems); 565 free(engine); 566} 567 568 569lsquic_conn_t * 570lsquic_engine_connect (lsquic_engine_t *engine, const struct sockaddr *peer_sa, 571 void *peer_ctx, lsquic_conn_ctx_t *conn_ctx, 572 const char *hostname, unsigned short max_packet_size) 573{ 574 lsquic_conn_t *conn; 575 ENGINE_IN(engine); 576 577 if (engine->flags & ENG_SERVER) 578 { 579 LSQ_ERROR("`%s' must only be called in client mode", __func__); 580 goto err; 581 } 582 583 if (0 == max_packet_size) 584 { 585 switch (peer_sa->sa_family) 586 { 587 case AF_INET: 588 max_packet_size = QUIC_MAX_IPv4_PACKET_SZ; 589 break; 590 default: 591 max_packet_size = QUIC_MAX_IPv6_PACKET_SZ; 592 break; 593 } 594 } 595 596 conn = new_full_conn_client(engine, hostname, max_packet_size); 597 if (!conn) 598 goto err; 599 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 600 engine_incref_conn(conn, LSCONN_TICKABLE); 601 lsquic_conn_record_peer_sa(conn, peer_sa); 602 conn->cn_peer_ctx = peer_ctx; 603 lsquic_conn_set_ctx(conn, conn_ctx); 604 full_conn_client_call_on_new(conn); 605 end: 606 ENGINE_OUT(engine); 607 return conn; 608 err: 609 conn = NULL; 610 goto end; 611} 612 613 614static void 615remove_conn_from_hash (lsquic_engine_t *engine, lsquic_conn_t *conn) 616{ 617 conn_hash_remove(&engine->conns_hash, conn); 618 (void) engine_decref_conn(engine, conn, LSCONN_HASHED); 619} 620 621 622static void 623refflags2str (enum lsquic_conn_flags flags, char s[6]) 624{ 625 *s = 'C'; s += !!(flags & LSCONN_CLOSING); 626 *s = 'H'; s += !!(flags & LSCONN_HASHED); 627 *s = 'O'; s += !!(flags & LSCONN_HAS_OUTGOING); 628 *s = 'T'; s += !!(flags & LSCONN_TICKABLE); 629 *s = 'A'; s += !!(flags & LSCONN_ATTQ); 630 *s = 'K'; s += !!(flags & LSCONN_TICKED); 631 *s = '\0'; 632} 633 634 635static void 636engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag) 637{ 638 char str[2][7]; 639 assert(flag & CONN_REF_FLAGS); 640 assert(!(conn->cn_flags & flag)); 641 conn->cn_flags |= flag; 642 LSQ_DEBUG("incref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 643 (refflags2str(conn->cn_flags & ~flag, str[0]), str[0]), 644 (refflags2str(conn->cn_flags, str[1]), str[1])); 645} 646 647 648static lsquic_conn_t * 649engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 650 enum lsquic_conn_flags flags) 651{ 652 char str[2][7]; 653 assert(flags & CONN_REF_FLAGS); 654 assert(conn->cn_flags & flags); 655#ifndef NDEBUG 656 if (flags & LSCONN_CLOSING) 657 assert(0 == (conn->cn_flags & LSCONN_HASHED)); 658#endif 659 conn->cn_flags &= ~flags; 660 LSQ_DEBUG("decref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 661 (refflags2str(conn->cn_flags | flags, str[0]), str[0]), 662 (refflags2str(conn->cn_flags, str[1]), str[1])); 663 if (0 == (conn->cn_flags & CONN_REF_FLAGS)) 664 { 665 eng_hist_inc(&engine->history, 0, sl_del_full_conns); 666 destroy_conn(engine, conn); 667 return NULL; 668 } 669 else 670 return conn; 671} 672 673 674/* This is not a general-purpose function. Only call from engine dtor. */ 675static void 676force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn) 677{ 678 assert(engine->flags & ENG_DTOR); 679 const enum lsquic_conn_flags flags = conn->cn_flags; 680 assert(conn->cn_flags & CONN_REF_FLAGS); 681 assert(!(flags & LSCONN_HAS_OUTGOING)); /* Should be removed already */ 682 assert(!(flags & LSCONN_TICKABLE)); /* Should be removed already */ 683 assert(!(flags & LSCONN_CLOSING)); /* It is in transient queue? */ 684 if (flags & LSCONN_ATTQ) 685 { 686 attq_remove(engine->attq, conn); 687 (void) engine_decref_conn(engine, conn, LSCONN_ATTQ); 688 } 689 if (flags & LSCONN_HASHED) 690 remove_conn_from_hash(engine, conn); 691} 692 693 694/* Iterator for tickable connections (those on the Tickable Queue). Before 695 * a connection is returned, it is removed from the Advisory Tick Time queue 696 * if necessary. 697 */ 698static lsquic_conn_t * 699conn_iter_next_tickable (struct lsquic_engine *engine) 700{ 701 lsquic_conn_t *conn; 702 703 conn = lsquic_mh_pop(&engine->conns_tickable); 704 705 if (conn) 706 conn = engine_decref_conn(engine, conn, LSCONN_TICKABLE); 707 if (conn && (conn->cn_flags & LSCONN_ATTQ)) 708 { 709 attq_remove(engine->attq, conn); 710 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 711 } 712 713 return conn; 714} 715 716 717void 718lsquic_engine_process_conns (lsquic_engine_t *engine) 719{ 720 lsquic_conn_t *conn; 721 lsquic_time_t now; 722 723 ENGINE_IN(engine); 724 725 now = lsquic_time_now(); 726 while ((conn = attq_pop(engine->attq, now))) 727 { 728 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 729 if (conn && !(conn->cn_flags & LSCONN_TICKABLE)) 730 { 731 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 732 engine_incref_conn(conn, LSCONN_TICKABLE); 733 } 734 } 735 736 process_connections(engine, conn_iter_next_tickable, now); 737 ENGINE_OUT(engine); 738} 739 740 741static int 742generate_header (const lsquic_packet_out_t *packet_out, 743 const struct parse_funcs *pf, lsquic_cid_t cid, 744 unsigned char *buf, size_t bufsz) 745{ 746 return pf->pf_gen_reg_pkt_header(buf, bufsz, 747 packet_out->po_flags & PO_CONN_ID ? &cid : NULL, 748 packet_out->po_flags & PO_VERSION ? &packet_out->po_ver_tag : NULL, 749 packet_out->po_flags & PO_NONCE ? packet_out->po_nonce : NULL, 750 packet_out->po_packno, lsquic_packet_out_packno_bits(packet_out)); 751} 752 753 754static ssize_t 755really_encrypt_packet (const lsquic_conn_t *conn, 756 const lsquic_packet_out_t *packet_out, 757 unsigned char *buf, size_t bufsz) 758{ 759 int enc, header_sz, is_hello_packet; 760 size_t packet_sz; 761 unsigned char header_buf[QUIC_MAX_PUBHDR_SZ]; 762 763 header_sz = generate_header(packet_out, conn->cn_pf, conn->cn_cid, 764 header_buf, sizeof(header_buf)); 765 if (header_sz < 0) 766 return -1; 767 768 is_hello_packet = !!(packet_out->po_flags & PO_HELLO); 769 enc = conn->cn_esf->esf_encrypt(conn->cn_enc_session, conn->cn_version, 0, 770 packet_out->po_packno, header_buf, header_sz, 771 packet_out->po_data, packet_out->po_data_sz, 772 buf, bufsz, &packet_sz, is_hello_packet); 773 if (0 == enc) 774 { 775 LSQ_DEBUG("encrypted packet %"PRIu64"; plaintext is %u bytes, " 776 "ciphertext is %zd bytes", 777 packet_out->po_packno, 778 lsquic_po_header_length(packet_out->po_flags) + 779 packet_out->po_data_sz, 780 packet_sz); 781 return packet_sz; 782 } 783 else 784 return -1; 785} 786 787 788static enum { ENCPA_OK, ENCPA_NOMEM, ENCPA_BADCRYPT, } 789encrypt_packet (lsquic_engine_t *engine, const lsquic_conn_t *conn, 790 lsquic_packet_out_t *packet_out) 791{ 792 ssize_t enc_sz; 793 size_t bufsz; 794 unsigned sent_sz; 795 unsigned char *buf; 796 797 bufsz = lsquic_po_header_length(packet_out->po_flags) + 798 packet_out->po_data_sz + QUIC_PACKET_HASH_SZ; 799 buf = engine->pub.enp_pmi->pmi_allocate(engine->pub.enp_pmi_ctx, bufsz); 800 if (!buf) 801 { 802 LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd", 803 bufsz); 804 return ENCPA_NOMEM; 805 } 806 807 { 808 enc_sz = really_encrypt_packet(conn, packet_out, buf, bufsz); 809 sent_sz = enc_sz; 810 } 811 812 if (enc_sz < 0) 813 { 814 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, buf); 815 return ENCPA_BADCRYPT; 816 } 817 818 packet_out->po_enc_data = buf; 819 packet_out->po_enc_data_sz = enc_sz; 820 packet_out->po_sent_sz = sent_sz; 821 packet_out->po_flags |= PO_ENCRYPTED|PO_SENT_SZ; 822 823 return ENCPA_OK; 824} 825 826 827STAILQ_HEAD(conns_stailq, lsquic_conn); 828TAILQ_HEAD(conns_tailq, lsquic_conn); 829 830 831struct conns_out_iter 832{ 833 struct min_heap *coi_heap; 834 TAILQ_HEAD(, lsquic_conn) coi_active_list, 835 coi_inactive_list; 836 lsquic_conn_t *coi_next; 837#ifndef NDEBUG 838 lsquic_time_t coi_last_sent; 839#endif 840}; 841 842 843static void 844coi_init (struct conns_out_iter *iter, struct lsquic_engine *engine) 845{ 846 iter->coi_heap = &engine->conns_out; 847 iter->coi_next = NULL; 848 TAILQ_INIT(&iter->coi_active_list); 849 TAILQ_INIT(&iter->coi_inactive_list); 850#ifndef NDEBUG 851 iter->coi_last_sent = 0; 852#endif 853} 854 855 856static lsquic_conn_t * 857coi_next (struct conns_out_iter *iter) 858{ 859 lsquic_conn_t *conn; 860 861 if (lsquic_mh_count(iter->coi_heap) > 0) 862 { 863 conn = lsquic_mh_pop(iter->coi_heap); 864 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 865 conn->cn_flags |= LSCONN_COI_ACTIVE; 866#ifndef NDEBUG 867 if (iter->coi_last_sent) 868 assert(iter->coi_last_sent <= conn->cn_last_sent); 869 iter->coi_last_sent = conn->cn_last_sent; 870#endif 871 return conn; 872 } 873 else if (!TAILQ_EMPTY(&iter->coi_active_list)) 874 { 875 conn = iter->coi_next; 876 if (!conn) 877 conn = TAILQ_FIRST(&iter->coi_active_list); 878 if (conn) 879 iter->coi_next = TAILQ_NEXT(conn, cn_next_out); 880 return conn; 881 } 882 else 883 return NULL; 884} 885 886 887static void 888coi_deactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 889{ 890 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 891 { 892 assert(!TAILQ_EMPTY(&iter->coi_active_list)); 893 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 894 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 895 TAILQ_INSERT_TAIL(&iter->coi_inactive_list, conn, cn_next_out); 896 conn->cn_flags |= LSCONN_COI_INACTIVE; 897 } 898} 899 900 901static void 902coi_reactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 903{ 904 assert(conn->cn_flags & LSCONN_COI_INACTIVE); 905 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 906 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 907 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 908 conn->cn_flags |= LSCONN_COI_ACTIVE; 909} 910 911 912static void 913coi_reheap (struct conns_out_iter *iter, lsquic_engine_t *engine) 914{ 915 lsquic_conn_t *conn; 916 while ((conn = TAILQ_FIRST(&iter->coi_active_list))) 917 { 918 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 919 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 920 lsquic_mh_insert(iter->coi_heap, conn, conn->cn_last_sent); 921 } 922 while ((conn = TAILQ_FIRST(&iter->coi_inactive_list))) 923 { 924 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 925 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 926 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 927 } 928} 929 930 931static unsigned 932send_batch (lsquic_engine_t *engine, struct conns_out_iter *conns_iter, 933 struct out_batch *batch, unsigned n_to_send) 934{ 935 int n_sent, i; 936 lsquic_time_t now; 937 938 /* Set sent time before the write to avoid underestimating RTT */ 939 now = lsquic_time_now(); 940 for (i = 0; i < (int) n_to_send; ++i) 941 batch->packets[i]->po_sent = now; 942 n_sent = engine->packets_out(engine->packets_out_ctx, batch->outs, 943 n_to_send); 944 if (n_sent >= 0) 945 LSQ_DEBUG("packets out returned %d (out of %u)", n_sent, n_to_send); 946 else 947 { 948 engine->pub.enp_flags &= ~ENPUB_CAN_SEND; 949 LSQ_DEBUG("packets out returned an error: %s", strerror(errno)); 950 EV_LOG_GENERIC_EVENT("cannot send packets"); 951 n_sent = 0; 952 } 953 if (n_sent > 0) 954 engine->last_sent = now + n_sent; 955 for (i = 0; i < n_sent; ++i) 956 { 957 eng_hist_inc(&engine->history, now, sl_packets_out); 958 EV_LOG_PACKET_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 959 batch->conns[i]->cn_if->ci_packet_sent(batch->conns[i], 960 batch->packets[i]); 961 /* `i' is added to maintain relative order */ 962 batch->conns[i]->cn_last_sent = now + i; 963 /* Release packet out buffer as soon as the packet is sent 964 * successfully. If not successfully sent, we hold on to 965 * this buffer until the packet sending is attempted again 966 * or until it times out and regenerated. 967 */ 968 if (batch->packets[i]->po_flags & PO_ENCRYPTED) 969 { 970 batch->packets[i]->po_flags &= ~PO_ENCRYPTED; 971 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, 972 batch->packets[i]->po_enc_data); 973 batch->packets[i]->po_enc_data = NULL; /* JIC */ 974 } 975 } 976 if (LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_EVENT)) 977 for ( ; i < (int) n_to_send; ++i) 978 EV_LOG_PACKET_NOT_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 979 /* Return packets to the connection in reverse order so that the packet 980 * ordering is maintained. 981 */ 982 for (i = (int) n_to_send - 1; i >= n_sent; --i) 983 { 984 batch->conns[i]->cn_if->ci_packet_not_sent(batch->conns[i], 985 batch->packets[i]); 986 if (!(batch->conns[i]->cn_flags & (LSCONN_COI_ACTIVE|LSCONN_EVANESCENT))) 987 coi_reactivate(conns_iter, batch->conns[i]); 988 } 989 return n_sent; 990} 991 992 993/* Return 1 if went past deadline, 0 otherwise */ 994static int 995check_deadline (lsquic_engine_t *engine) 996{ 997 if (engine->pub.enp_settings.es_proc_time_thresh && 998 lsquic_time_now() > engine->deadline) 999 { 1000 LSQ_INFO("went past threshold of %u usec, stop sending", 1001 engine->pub.enp_settings.es_proc_time_thresh); 1002 engine->flags |= ENG_PAST_DEADLINE; 1003 return 1; 1004 } 1005 else 1006 return 0; 1007} 1008 1009 1010static void 1011send_packets_out (struct lsquic_engine *engine, 1012 struct conns_tailq *ticked_conns, 1013 struct conns_stailq *closed_conns) 1014{ 1015 unsigned n, w, n_sent, n_batches_sent; 1016 lsquic_packet_out_t *packet_out; 1017 lsquic_conn_t *conn; 1018 struct out_batch *const batch = &engine->out_batch; 1019 struct conns_out_iter conns_iter; 1020 int shrink, deadline_exceeded; 1021 1022 coi_init(&conns_iter, engine); 1023 n_batches_sent = 0; 1024 n_sent = 0, n = 0; 1025 shrink = 0; 1026 deadline_exceeded = 0; 1027 1028 while ((conn = coi_next(&conns_iter))) 1029 { 1030 packet_out = conn->cn_if->ci_next_packet_to_send(conn); 1031 if (!packet_out) { 1032 LSQ_DEBUG("batched all outgoing packets for conn %"PRIu64, 1033 conn->cn_cid); 1034 coi_deactivate(&conns_iter, conn); 1035 continue; 1036 } 1037 if (!(packet_out->po_flags & (PO_ENCRYPTED|PO_NOENCRYPT))) 1038 { 1039 switch (encrypt_packet(engine, conn, packet_out)) 1040 { 1041 case ENCPA_NOMEM: 1042 /* Send what we have and wait for a more opportune moment */ 1043 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1044 goto end_for; 1045 case ENCPA_BADCRYPT: 1046 /* This is pretty bad: close connection immediately */ 1047 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1048 LSQ_INFO("conn %"PRIu64" has unsendable packets", conn->cn_cid); 1049 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 1050 { 1051 if (!(conn->cn_flags & LSCONN_CLOSING)) 1052 { 1053 STAILQ_INSERT_TAIL(closed_conns, conn, cn_next_closed_conn); 1054 engine_incref_conn(conn, LSCONN_CLOSING); 1055 if (conn->cn_flags & LSCONN_HASHED) 1056 remove_conn_from_hash(engine, conn); 1057 } 1058 coi_deactivate(&conns_iter, conn); 1059 if (conn->cn_flags & LSCONN_TICKED) 1060 { 1061 TAILQ_REMOVE(ticked_conns, conn, cn_next_ticked); 1062 engine_decref_conn(engine, conn, LSCONN_TICKED); 1063 } 1064 } 1065 continue; 1066 case ENCPA_OK: 1067 break; 1068 } 1069 } 1070 LSQ_DEBUG("batched packet %"PRIu64" for connection %"PRIu64, 1071 packet_out->po_packno, conn->cn_cid); 1072 assert(conn->cn_flags & LSCONN_HAS_PEER_SA); 1073 if (packet_out->po_flags & PO_ENCRYPTED) 1074 { 1075 batch->outs[n].buf = packet_out->po_enc_data; 1076 batch->outs[n].sz = packet_out->po_enc_data_sz; 1077 } 1078 else 1079 { 1080 batch->outs[n].buf = packet_out->po_data; 1081 batch->outs[n].sz = packet_out->po_data_sz; 1082 } 1083 batch->outs [n].peer_ctx = conn->cn_peer_ctx; 1084 batch->outs [n].local_sa = (struct sockaddr *) conn->cn_local_addr; 1085 batch->outs [n].dest_sa = (struct sockaddr *) conn->cn_peer_addr; 1086 batch->conns [n] = conn; 1087 batch->packets[n] = packet_out; 1088 ++n; 1089 if (n == engine->batch_size) 1090 { 1091 n = 0; 1092 w = send_batch(engine, &conns_iter, batch, engine->batch_size); 1093 ++n_batches_sent; 1094 n_sent += w; 1095 if (w < engine->batch_size) 1096 { 1097 shrink = 1; 1098 break; 1099 } 1100 deadline_exceeded = check_deadline(engine); 1101 if (deadline_exceeded) 1102 break; 1103 grow_batch_size(engine); 1104 } 1105 } 1106 end_for: 1107 1108 if (n > 0) { 1109 w = send_batch(engine, &conns_iter, batch, n); 1110 n_sent += w; 1111 shrink = w < n; 1112 ++n_batches_sent; 1113 deadline_exceeded = check_deadline(engine); 1114 } 1115 1116 if (shrink) 1117 shrink_batch_size(engine); 1118 else if (n_batches_sent > 1 && !deadline_exceeded) 1119 grow_batch_size(engine); 1120 1121 coi_reheap(&conns_iter, engine); 1122 1123 LSQ_DEBUG("%s: sent %u packet%.*s", __func__, n_sent, n_sent != 1, "s"); 1124} 1125 1126 1127int 1128lsquic_engine_has_unsent_packets (lsquic_engine_t *engine) 1129{ 1130 return lsquic_mh_count(&engine->conns_out) > 0 1131 ; 1132} 1133 1134 1135static void 1136reset_deadline (lsquic_engine_t *engine, lsquic_time_t now) 1137{ 1138 engine->deadline = now + engine->pub.enp_settings.es_proc_time_thresh; 1139 engine->flags &= ~ENG_PAST_DEADLINE; 1140} 1141 1142 1143/* TODO: this is a user-facing function, account for load */ 1144void 1145lsquic_engine_send_unsent_packets (lsquic_engine_t *engine) 1146{ 1147 lsquic_conn_t *conn; 1148 struct conns_stailq closed_conns; 1149 struct conns_tailq ticked_conns = TAILQ_HEAD_INITIALIZER(ticked_conns); 1150 1151 STAILQ_INIT(&closed_conns); 1152 reset_deadline(engine, lsquic_time_now()); 1153 if (!(engine->pub.enp_flags & ENPUB_CAN_SEND)) 1154 { 1155 LSQ_DEBUG("can send again"); 1156 EV_LOG_GENERIC_EVENT("can send again"); 1157 engine->pub.enp_flags |= ENPUB_CAN_SEND; 1158 } 1159 1160 send_packets_out(engine, &ticked_conns, &closed_conns); 1161 1162 while ((conn = STAILQ_FIRST(&closed_conns))) { 1163 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1164 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1165 } 1166 1167} 1168 1169 1170static void 1171process_connections (lsquic_engine_t *engine, conn_iter_f next_conn, 1172 lsquic_time_t now) 1173{ 1174 lsquic_conn_t *conn; 1175 enum tick_st tick_st; 1176 unsigned i; 1177 lsquic_time_t next_tick_time; 1178 struct conns_stailq closed_conns; 1179 struct conns_tailq ticked_conns; 1180 1181 eng_hist_tick(&engine->history, now); 1182 1183 STAILQ_INIT(&closed_conns); 1184 TAILQ_INIT(&ticked_conns); 1185 reset_deadline(engine, now); 1186 1187 i = 0; 1188 while ((conn = next_conn(engine)) 1189 ) 1190 { 1191 tick_st = conn->cn_if->ci_tick(conn, now); 1192 conn->cn_last_ticked = now + i /* Maintain relative order */ ++; 1193 if (tick_st & TICK_SEND) 1194 { 1195 if (!(conn->cn_flags & LSCONN_HAS_OUTGOING)) 1196 { 1197 lsquic_mh_insert(&engine->conns_out, conn, conn->cn_last_sent); 1198 engine_incref_conn(conn, LSCONN_HAS_OUTGOING); 1199 } 1200 } 1201 if (tick_st & TICK_CLOSE) 1202 { 1203 STAILQ_INSERT_TAIL(&closed_conns, conn, cn_next_closed_conn); 1204 engine_incref_conn(conn, LSCONN_CLOSING); 1205 if (conn->cn_flags & LSCONN_HASHED) 1206 remove_conn_from_hash(engine, conn); 1207 } 1208 else 1209 { 1210 TAILQ_INSERT_TAIL(&ticked_conns, conn, cn_next_ticked); 1211 engine_incref_conn(conn, LSCONN_TICKED); 1212 } 1213 } 1214 1215 if ((engine->pub.enp_flags & ENPUB_CAN_SEND) 1216 && lsquic_engine_has_unsent_packets(engine)) 1217 send_packets_out(engine, &ticked_conns, &closed_conns); 1218 1219 while ((conn = STAILQ_FIRST(&closed_conns))) { 1220 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1221 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1222 } 1223 1224 /* TODO Heapification can be optimized by switching to the Floyd method: 1225 * https://en.wikipedia.org/wiki/Binary_heap#Building_a_heap 1226 */ 1227 while ((conn = TAILQ_FIRST(&ticked_conns))) 1228 { 1229 TAILQ_REMOVE(&ticked_conns, conn, cn_next_ticked); 1230 engine_decref_conn(engine, conn, LSCONN_TICKED); 1231 if (!(conn->cn_flags & LSCONN_TICKABLE) 1232 && conn->cn_if->ci_is_tickable(conn)) 1233 { 1234 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 1235 engine_incref_conn(conn, LSCONN_TICKABLE); 1236 } 1237 else if (!(conn->cn_flags & LSCONN_ATTQ)) 1238 { 1239 next_tick_time = conn->cn_if->ci_next_tick_time(conn); 1240 if (next_tick_time) 1241 { 1242 if (0 == attq_add(engine->attq, conn, next_tick_time)) 1243 engine_incref_conn(conn, LSCONN_ATTQ); 1244 } 1245 else 1246 assert(0); 1247 } 1248 } 1249 1250} 1251 1252 1253/* Return 0 if packet is being processed by a real connection, 1 if the 1254 * packet was processed, but not by a connection, and -1 on error. 1255 */ 1256int 1257lsquic_engine_packet_in (lsquic_engine_t *engine, 1258 const unsigned char *packet_in_data, size_t packet_in_size, 1259 const struct sockaddr *sa_local, const struct sockaddr *sa_peer, 1260 void *peer_ctx) 1261{ 1262 struct packin_parse_state ppstate; 1263 lsquic_packet_in_t *packet_in; 1264 1265 if (packet_in_size > QUIC_MAX_PACKET_SZ) 1266 { 1267 LSQ_DEBUG("Cannot handle packet_in_size(%zd) > %d packet incoming " 1268 "packet's header", packet_in_size, QUIC_MAX_PACKET_SZ); 1269 errno = E2BIG; 1270 return -1; 1271 } 1272 1273 packet_in = lsquic_mm_get_packet_in(&engine->pub.enp_mm); 1274 if (!packet_in) 1275 return -1; 1276 1277 /* Library does not modify packet_in_data, it is not referenced after 1278 * this function returns and subsequent release of pi_data is guarded 1279 * by PI_OWN_DATA flag. 1280 */ 1281 packet_in->pi_data = (unsigned char *) packet_in_data; 1282 if (0 != parse_packet_in_begin(packet_in, packet_in_size, 1283 engine->flags & ENG_SERVER, &ppstate)) 1284 { 1285 LSQ_DEBUG("Cannot parse incoming packet's header"); 1286 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 1287 errno = EINVAL; 1288 return -1; 1289 } 1290 1291 packet_in->pi_received = lsquic_time_now(); 1292 eng_hist_inc(&engine->history, packet_in->pi_received, sl_packets_in); 1293 return process_packet_in(engine, packet_in, &ppstate, sa_local, sa_peer, 1294 peer_ctx); 1295} 1296 1297 1298#if __GNUC__ && !defined(NDEBUG) 1299__attribute__((weak)) 1300#endif 1301unsigned 1302lsquic_engine_quic_versions (const lsquic_engine_t *engine) 1303{ 1304 return engine->pub.enp_settings.es_versions; 1305} 1306 1307 1308int 1309lsquic_engine_earliest_adv_tick (lsquic_engine_t *engine, int *diff) 1310{ 1311 const lsquic_time_t *next_time; 1312 lsquic_time_t now; 1313 1314 if (((engine->flags & ENG_PAST_DEADLINE) 1315 && lsquic_mh_count(&engine->conns_out)) 1316 || lsquic_mh_count(&engine->conns_tickable)) 1317 { 1318 *diff = 0; 1319 return 1; 1320 } 1321 1322 next_time = attq_next_time(engine->attq); 1323 if (!next_time) 1324 return 0; 1325 1326 now = lsquic_time_now(); 1327 *diff = (int) ((int64_t) *next_time - (int64_t) now); 1328 return 1; 1329} 1330 1331 1332unsigned 1333lsquic_engine_count_attq (lsquic_engine_t *engine, int from_now) 1334{ 1335 lsquic_time_t now; 1336 now = lsquic_time_now(); 1337 if (from_now < 0) 1338 now -= from_now; 1339 else 1340 now += from_now; 1341 return attq_count_before(engine->attq, now); 1342} 1343