lsquic_engine.c revision 3b55e6ae
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#include "lsquic_http1x_if.h" 59 60#define LSQUIC_LOGGER_MODULE LSQLM_ENGINE 61#include "lsquic_logger.h" 62 63 64/* The batch of outgoing packets grows and shrinks dynamically */ 65#define MAX_OUT_BATCH_SIZE 1024 66#define MIN_OUT_BATCH_SIZE 256 67#define INITIAL_OUT_BATCH_SIZE 512 68 69struct out_batch 70{ 71 lsquic_conn_t *conns [MAX_OUT_BATCH_SIZE]; 72 lsquic_packet_out_t *packets[MAX_OUT_BATCH_SIZE]; 73 struct lsquic_out_spec outs [MAX_OUT_BATCH_SIZE]; 74}; 75 76typedef struct lsquic_conn * (*conn_iter_f)(struct lsquic_engine *); 77 78static void 79process_connections (struct lsquic_engine *engine, conn_iter_f iter, 80 lsquic_time_t now); 81 82static void 83engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag); 84 85static lsquic_conn_t * 86engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 87 enum lsquic_conn_flags flag); 88 89static void 90force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn); 91 92/* Nested calls to LSQUIC are not supported */ 93#define ENGINE_IN(e) do { \ 94 assert(!((e)->pub.enp_flags & ENPUB_PROC)); \ 95 (e)->pub.enp_flags |= ENPUB_PROC; \ 96} while (0) 97 98#define ENGINE_OUT(e) do { \ 99 assert((e)->pub.enp_flags & ENPUB_PROC); \ 100 (e)->pub.enp_flags &= ~ENPUB_PROC; \ 101} while (0) 102 103/* A connection can be referenced from one of six places: 104 * 105 * 1. Connection hash: a connection starts its life in one of those. 106 * 107 * 2. Outgoing queue. 108 * 109 * 3. Tickable queue 110 * 111 * 4. Advisory Tick Time queue. 112 * 113 * 5. Closing connections queue. This is a transient queue -- it only 114 * exists for the duration of process_connections() function call. 115 * 116 * 6. Ticked connections queue. Another transient queue, similar to (5). 117 * 118 * The idea is to destroy the connection when it is no longer referenced. 119 * For example, a connection tick may return TICK_SEND|TICK_CLOSE. In 120 * that case, the connection is referenced from two places: (2) and (5). 121 * After its packets are sent, it is only referenced in (5), and at the 122 * end of the function call, when it is removed from (5), reference count 123 * goes to zero and the connection is destroyed. If not all packets can 124 * be sent, at the end of the function call, the connection is referenced 125 * by (2) and will only be removed once all outgoing packets have been 126 * sent. 127 */ 128#define CONN_REF_FLAGS (LSCONN_HASHED \ 129 |LSCONN_HAS_OUTGOING \ 130 |LSCONN_TICKABLE \ 131 |LSCONN_TICKED \ 132 |LSCONN_CLOSING \ 133 |LSCONN_ATTQ) 134 135 136 137 138struct lsquic_engine 139{ 140 struct lsquic_engine_public pub; 141 enum { 142 ENG_SERVER = LSENG_SERVER, 143 ENG_HTTP = LSENG_HTTP, 144 ENG_COOLDOWN = (1 << 7), /* Cooldown: no new connections */ 145 ENG_PAST_DEADLINE 146 = (1 << 8), /* Previous call to a processing 147 * function went past time threshold. 148 */ 149#ifndef NDEBUG 150 ENG_DTOR = (1 << 26), /* Engine destructor */ 151#endif 152 } flags; 153 const struct lsquic_stream_if *stream_if; 154 void *stream_if_ctx; 155 lsquic_packets_out_f packets_out; 156 void *packets_out_ctx; 157 void *bad_handshake_ctx; 158 struct conn_hash conns_hash; 159 struct min_heap conns_tickable; 160 struct min_heap conns_out; 161 struct eng_hist history; 162 unsigned batch_size; 163 struct attq *attq; 164 /* Track time last time a packet was sent to give new connections 165 * priority lower than that of existing connections. 166 */ 167 lsquic_time_t last_sent; 168 unsigned n_conns; 169 lsquic_time_t deadline; 170 struct out_batch out_batch; 171}; 172 173 174void 175lsquic_engine_init_settings (struct lsquic_engine_settings *settings, 176 unsigned flags) 177{ 178 memset(settings, 0, sizeof(*settings)); 179 settings->es_versions = LSQUIC_DF_VERSIONS; 180 if (flags & ENG_SERVER) 181 { 182 settings->es_cfcw = LSQUIC_DF_CFCW_SERVER; 183 settings->es_sfcw = LSQUIC_DF_SFCW_SERVER; 184 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_SERVER; 185 } 186 else 187 { 188 settings->es_cfcw = LSQUIC_DF_CFCW_CLIENT; 189 settings->es_sfcw = LSQUIC_DF_SFCW_CLIENT; 190 settings->es_support_srej= LSQUIC_DF_SUPPORT_SREJ_CLIENT; 191 } 192 settings->es_max_streams_in = LSQUIC_DF_MAX_STREAMS_IN; 193 settings->es_idle_conn_to = LSQUIC_DF_IDLE_CONN_TO; 194 settings->es_handshake_to = LSQUIC_DF_HANDSHAKE_TO; 195 settings->es_silent_close = LSQUIC_DF_SILENT_CLOSE; 196 settings->es_max_header_list_size 197 = LSQUIC_DF_MAX_HEADER_LIST_SIZE; 198 settings->es_ua = LSQUIC_DF_UA; 199 200 settings->es_pdmd = QTAG_X509; 201 settings->es_aead = QTAG_AESG; 202 settings->es_kexs = QTAG_C255; 203 settings->es_support_push = LSQUIC_DF_SUPPORT_PUSH; 204 settings->es_support_tcid0 = LSQUIC_DF_SUPPORT_TCID0; 205 settings->es_support_nstp = LSQUIC_DF_SUPPORT_NSTP; 206 settings->es_honor_prst = LSQUIC_DF_HONOR_PRST; 207 settings->es_progress_check = LSQUIC_DF_PROGRESS_CHECK; 208 settings->es_rw_once = LSQUIC_DF_RW_ONCE; 209 settings->es_proc_time_thresh= LSQUIC_DF_PROC_TIME_THRESH; 210 settings->es_pace_packets = LSQUIC_DF_PACE_PACKETS; 211} 212 213 214/* Note: if returning an error, err_buf must be valid if non-NULL */ 215int 216lsquic_engine_check_settings (const struct lsquic_engine_settings *settings, 217 unsigned flags, 218 char *err_buf, size_t err_buf_sz) 219{ 220 if (settings->es_cfcw < LSQUIC_MIN_FCW || 221 settings->es_sfcw < LSQUIC_MIN_FCW) 222 { 223 if (err_buf) 224 snprintf(err_buf, err_buf_sz, "%s", 225 "flow control window set too low"); 226 return -1; 227 } 228 if (0 == (settings->es_versions & LSQUIC_SUPPORTED_VERSIONS)) 229 { 230 if (err_buf) 231 snprintf(err_buf, err_buf_sz, "%s", 232 "No supported QUIC versions specified"); 233 return -1; 234 } 235 if (settings->es_versions & ~LSQUIC_SUPPORTED_VERSIONS) 236 { 237 if (err_buf) 238 snprintf(err_buf, err_buf_sz, "%s", 239 "one or more unsupported QUIC version is specified"); 240 return -1; 241 } 242 return 0; 243} 244 245 246static void 247free_packet (void *ctx, unsigned char *packet_data) 248{ 249 free(packet_data); 250} 251 252 253static void * 254malloc_buf (void *ctx, size_t size) 255{ 256 return malloc(size); 257} 258 259 260static const struct lsquic_packout_mem_if stock_pmi = 261{ 262 malloc_buf, (void(*)(void *, void *)) free_packet, 263}; 264 265 266static int 267hash_conns_by_addr (const struct lsquic_engine *engine) 268{ 269 if (engine->pub.enp_settings.es_versions & LSQUIC_FORCED_TCID0_VERSIONS) 270 return 1; 271 if ((engine->pub.enp_settings.es_versions & LSQUIC_GQUIC_HEADER_VERSIONS) 272 && engine->pub.enp_settings.es_support_tcid0) 273 return 1; 274 return 0; 275} 276 277 278lsquic_engine_t * 279lsquic_engine_new (unsigned flags, 280 const struct lsquic_engine_api *api) 281{ 282 lsquic_engine_t *engine; 283 int tag_buf_len; 284 char err_buf[100]; 285 286 if (!api->ea_packets_out) 287 { 288 LSQ_ERROR("packets_out callback is not specified"); 289 return NULL; 290 } 291 292 if (api->ea_settings && 293 0 != lsquic_engine_check_settings(api->ea_settings, flags, 294 err_buf, sizeof(err_buf))) 295 { 296 LSQ_ERROR("cannot create engine: %s", err_buf); 297 return NULL; 298 } 299 300 engine = calloc(1, sizeof(*engine)); 301 if (!engine) 302 return NULL; 303 if (0 != lsquic_mm_init(&engine->pub.enp_mm)) 304 { 305 free(engine); 306 return NULL; 307 } 308 if (api->ea_settings) 309 engine->pub.enp_settings = *api->ea_settings; 310 else 311 lsquic_engine_init_settings(&engine->pub.enp_settings, flags); 312 tag_buf_len = lsquic_gen_ver_tags(engine->pub.enp_ver_tags_buf, 313 sizeof(engine->pub.enp_ver_tags_buf), 314 engine->pub.enp_settings.es_versions); 315 if (tag_buf_len <= 0) 316 { 317 LSQ_ERROR("cannot generate version tags buffer"); 318 free(engine); 319 return NULL; 320 } 321 engine->pub.enp_ver_tags_len = tag_buf_len; 322 engine->pub.enp_flags = ENPUB_CAN_SEND; 323 324 engine->flags = flags; 325 engine->stream_if = api->ea_stream_if; 326 engine->stream_if_ctx = api->ea_stream_if_ctx; 327 engine->packets_out = api->ea_packets_out; 328 engine->packets_out_ctx = api->ea_packets_out_ctx; 329 if (api->ea_hsi_if) 330 { 331 engine->pub.enp_hsi_if = api->ea_hsi_if; 332 engine->pub.enp_hsi_ctx = api->ea_hsi_ctx; 333 } 334 else 335 { 336 engine->pub.enp_hsi_if = lsquic_http1x_if; 337 engine->pub.enp_hsi_ctx = NULL; 338 } 339 if (api->ea_pmi) 340 { 341 engine->pub.enp_pmi = api->ea_pmi; 342 engine->pub.enp_pmi_ctx = api->ea_pmi_ctx; 343 } 344 else 345 { 346 engine->pub.enp_pmi = &stock_pmi; 347 engine->pub.enp_pmi_ctx = NULL; 348 } 349 engine->pub.enp_verify_cert = api->ea_verify_cert; 350 engine->pub.enp_verify_ctx = api->ea_verify_ctx; 351 engine->pub.enp_engine = engine; 352 conn_hash_init(&engine->conns_hash, 353 hash_conns_by_addr(engine) ? CHF_USE_ADDR : 0); 354 engine->attq = attq_create(); 355 eng_hist_init(&engine->history); 356 engine->batch_size = INITIAL_OUT_BATCH_SIZE; 357 358 359 LSQ_INFO("instantiated engine"); 360 return engine; 361} 362 363 364static void 365grow_batch_size (struct lsquic_engine *engine) 366{ 367 engine->batch_size <<= engine->batch_size < MAX_OUT_BATCH_SIZE; 368} 369 370 371static void 372shrink_batch_size (struct lsquic_engine *engine) 373{ 374 engine->batch_size >>= engine->batch_size > MIN_OUT_BATCH_SIZE; 375} 376 377 378/* Wrapper to make sure important things occur before the connection is 379 * really destroyed. 380 */ 381static void 382destroy_conn (struct lsquic_engine *engine, lsquic_conn_t *conn) 383{ 384 --engine->n_conns; 385 conn->cn_flags |= LSCONN_NEVER_TICKABLE; 386 conn->cn_if->ci_destroy(conn); 387} 388 389 390static int 391maybe_grow_conn_heaps (struct lsquic_engine *engine) 392{ 393 struct min_heap_elem *els; 394 unsigned count; 395 396 if (engine->n_conns < lsquic_mh_nalloc(&engine->conns_tickable)) 397 return 0; /* Nothing to do */ 398 399 if (lsquic_mh_nalloc(&engine->conns_tickable)) 400 count = lsquic_mh_nalloc(&engine->conns_tickable) * 2 * 2; 401 else 402 count = 8; 403 404 els = malloc(sizeof(els[0]) * count); 405 if (!els) 406 { 407 LSQ_ERROR("%s: malloc failed", __func__); 408 return -1; 409 } 410 411 LSQ_DEBUG("grew heaps to %u elements", count / 2); 412 memcpy(&els[0], engine->conns_tickable.mh_elems, 413 sizeof(els[0]) * lsquic_mh_count(&engine->conns_tickable)); 414 memcpy(&els[count / 2], engine->conns_out.mh_elems, 415 sizeof(els[0]) * lsquic_mh_count(&engine->conns_out)); 416 free(engine->conns_tickable.mh_elems); 417 engine->conns_tickable.mh_elems = els; 418 engine->conns_out.mh_elems = &els[count / 2]; 419 engine->conns_tickable.mh_nalloc = count / 2; 420 engine->conns_out.mh_nalloc = count / 2; 421 return 0; 422} 423 424 425static lsquic_conn_t * 426new_full_conn_client (lsquic_engine_t *engine, const char *hostname, 427 unsigned short max_packet_size) 428{ 429 lsquic_conn_t *conn; 430 unsigned flags; 431 if (0 != maybe_grow_conn_heaps(engine)) 432 return NULL; 433 flags = engine->flags & (ENG_SERVER|ENG_HTTP); 434 conn = full_conn_client_new(&engine->pub, engine->stream_if, 435 engine->stream_if_ctx, flags, hostname, max_packet_size); 436 if (!conn) 437 return NULL; 438 ++engine->n_conns; 439 return conn; 440} 441 442 443static lsquic_conn_t * 444find_conn (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 445 struct packin_parse_state *ppstate, const struct sockaddr *sa_local) 446{ 447 lsquic_conn_t *conn; 448 449 if (conn_hash_using_addr(&engine->conns_hash)) 450 conn = conn_hash_find_by_addr(&engine->conns_hash, sa_local); 451 else if (packet_in->pi_flags & PI_CONN_ID) 452 conn = conn_hash_find_by_cid(&engine->conns_hash, 453 packet_in->pi_conn_id); 454 else 455 { 456 LSQ_DEBUG("packet header does not have connection ID: discarding"); 457 return NULL; 458 } 459 460 if (!conn) 461 return NULL; 462 463 conn->cn_pf->pf_parse_packet_in_finish(packet_in, ppstate); 464 if ((packet_in->pi_flags & PI_CONN_ID) 465 && conn->cn_cid != packet_in->pi_conn_id) 466 { 467 LSQ_DEBUG("connection IDs do not match"); 468 return NULL; 469 } 470 471 return conn; 472} 473 474 475#if !defined(NDEBUG) && __GNUC__ 476__attribute__((weak)) 477#endif 478void 479lsquic_engine_add_conn_to_tickable (struct lsquic_engine_public *enpub, 480 lsquic_conn_t *conn) 481{ 482 if (0 == (enpub->enp_flags & ENPUB_PROC) && 483 0 == (conn->cn_flags & (LSCONN_TICKABLE|LSCONN_NEVER_TICKABLE))) 484 { 485 lsquic_engine_t *engine = (lsquic_engine_t *) enpub; 486 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 487 engine_incref_conn(conn, LSCONN_TICKABLE); 488 } 489} 490 491 492void 493lsquic_engine_add_conn_to_attq (struct lsquic_engine_public *enpub, 494 lsquic_conn_t *conn, lsquic_time_t tick_time) 495{ 496 lsquic_engine_t *const engine = (lsquic_engine_t *) enpub; 497 if (conn->cn_flags & LSCONN_TICKABLE) 498 { 499 /* Optimization: no need to add the connection to the Advisory Tick 500 * Time Queue: it is about to be ticked, after which it its next tick 501 * time may be queried again. 502 */; 503 } 504 else if (conn->cn_flags & LSCONN_ATTQ) 505 { 506 if (lsquic_conn_adv_time(conn) != tick_time) 507 { 508 attq_remove(engine->attq, conn); 509 if (0 != attq_add(engine->attq, conn, tick_time)) 510 engine_decref_conn(engine, conn, LSCONN_ATTQ); 511 } 512 } 513 else if (0 == attq_add(engine->attq, conn, tick_time)) 514 engine_incref_conn(conn, LSCONN_ATTQ); 515} 516 517 518/* Return 0 if packet is being processed by a connections, otherwise return 1 */ 519static int 520process_packet_in (lsquic_engine_t *engine, lsquic_packet_in_t *packet_in, 521 struct packin_parse_state *ppstate, const struct sockaddr *sa_local, 522 const struct sockaddr *sa_peer, void *peer_ctx) 523{ 524 lsquic_conn_t *conn; 525 526 if (lsquic_packet_in_is_gquic_prst(packet_in) 527 && !engine->pub.enp_settings.es_honor_prst) 528 { 529 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 530 LSQ_DEBUG("public reset packet: discarding"); 531 return 1; 532 } 533 534 conn = find_conn(engine, packet_in, ppstate, sa_local); 535 536 if (!conn) 537 { 538 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 539 return 1; 540 } 541 542 if (0 == (conn->cn_flags & LSCONN_TICKABLE)) 543 { 544 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 545 engine_incref_conn(conn, LSCONN_TICKABLE); 546 } 547 lsquic_conn_record_sockaddr(conn, sa_local, sa_peer); 548 lsquic_packet_in_upref(packet_in); 549 conn->cn_peer_ctx = peer_ctx; 550 conn->cn_if->ci_packet_in(conn, packet_in); 551 lsquic_packet_in_put(&engine->pub.enp_mm, packet_in); 552 return 0; 553} 554 555 556void 557lsquic_engine_destroy (lsquic_engine_t *engine) 558{ 559 lsquic_conn_t *conn; 560 561 LSQ_DEBUG("destroying engine"); 562#ifndef NDEBUG 563 engine->flags |= ENG_DTOR; 564#endif 565 566 while ((conn = lsquic_mh_pop(&engine->conns_out))) 567 { 568 assert(conn->cn_flags & LSCONN_HAS_OUTGOING); 569 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 570 } 571 572 while ((conn = lsquic_mh_pop(&engine->conns_tickable))) 573 { 574 assert(conn->cn_flags & LSCONN_TICKABLE); 575 (void) engine_decref_conn(engine, conn, LSCONN_TICKABLE); 576 } 577 578 for (conn = conn_hash_first(&engine->conns_hash); conn; 579 conn = conn_hash_next(&engine->conns_hash)) 580 force_close_conn(engine, conn); 581 conn_hash_cleanup(&engine->conns_hash); 582 583 assert(0 == engine->n_conns); 584 attq_destroy(engine->attq); 585 586 assert(0 == lsquic_mh_count(&engine->conns_out)); 587 assert(0 == lsquic_mh_count(&engine->conns_tickable)); 588 lsquic_mm_cleanup(&engine->pub.enp_mm); 589 free(engine->conns_tickable.mh_elems); 590 free(engine); 591} 592 593 594lsquic_conn_t * 595lsquic_engine_connect (lsquic_engine_t *engine, const struct sockaddr *local_sa, 596 const struct sockaddr *peer_sa, 597 void *peer_ctx, lsquic_conn_ctx_t *conn_ctx, 598 const char *hostname, unsigned short max_packet_size) 599{ 600 lsquic_conn_t *conn; 601 ENGINE_IN(engine); 602 603 if (engine->flags & ENG_SERVER) 604 { 605 LSQ_ERROR("`%s' must only be called in client mode", __func__); 606 goto err; 607 } 608 609 if (conn_hash_using_addr(&engine->conns_hash) 610 && conn_hash_find_by_addr(&engine->conns_hash, local_sa)) 611 { 612 LSQ_ERROR("cannot have more than one connection on the same port"); 613 goto err; 614 } 615 616 if (0 == max_packet_size) 617 { 618 switch (peer_sa->sa_family) 619 { 620 case AF_INET: 621 max_packet_size = QUIC_MAX_IPv4_PACKET_SZ; 622 break; 623 default: 624 max_packet_size = QUIC_MAX_IPv6_PACKET_SZ; 625 break; 626 } 627 } 628 629 conn = new_full_conn_client(engine, hostname, max_packet_size); 630 if (!conn) 631 goto err; 632 lsquic_conn_record_sockaddr(conn, local_sa, peer_sa); 633 if (0 != conn_hash_add(&engine->conns_hash, conn)) 634 { 635 LSQ_WARN("cannot add connection %"PRIu64" to hash - destroy", 636 conn->cn_cid); 637 destroy_conn(engine, conn); 638 goto err; 639 } 640 assert(!(conn->cn_flags & 641 (CONN_REF_FLAGS 642 & ~LSCONN_TICKABLE /* This flag may be set as effect of user 643 callbacks */ 644 ))); 645 conn->cn_flags |= LSCONN_HASHED; 646 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 647 engine_incref_conn(conn, LSCONN_TICKABLE); 648 conn->cn_peer_ctx = peer_ctx; 649 lsquic_conn_set_ctx(conn, conn_ctx); 650 full_conn_client_call_on_new(conn); 651 end: 652 ENGINE_OUT(engine); 653 return conn; 654 err: 655 conn = NULL; 656 goto end; 657} 658 659 660static void 661remove_conn_from_hash (lsquic_engine_t *engine, lsquic_conn_t *conn) 662{ 663 conn_hash_remove(&engine->conns_hash, conn); 664 (void) engine_decref_conn(engine, conn, LSCONN_HASHED); 665} 666 667 668static void 669refflags2str (enum lsquic_conn_flags flags, char s[6]) 670{ 671 *s = 'C'; s += !!(flags & LSCONN_CLOSING); 672 *s = 'H'; s += !!(flags & LSCONN_HASHED); 673 *s = 'O'; s += !!(flags & LSCONN_HAS_OUTGOING); 674 *s = 'T'; s += !!(flags & LSCONN_TICKABLE); 675 *s = 'A'; s += !!(flags & LSCONN_ATTQ); 676 *s = 'K'; s += !!(flags & LSCONN_TICKED); 677 *s = '\0'; 678} 679 680 681static void 682engine_incref_conn (lsquic_conn_t *conn, enum lsquic_conn_flags flag) 683{ 684 char str[2][7]; 685 assert(flag & CONN_REF_FLAGS); 686 assert(!(conn->cn_flags & flag)); 687 conn->cn_flags |= flag; 688 LSQ_DEBUG("incref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 689 (refflags2str(conn->cn_flags & ~flag, str[0]), str[0]), 690 (refflags2str(conn->cn_flags, str[1]), str[1])); 691} 692 693 694static lsquic_conn_t * 695engine_decref_conn (lsquic_engine_t *engine, lsquic_conn_t *conn, 696 enum lsquic_conn_flags flags) 697{ 698 char str[2][7]; 699 assert(flags & CONN_REF_FLAGS); 700 assert(conn->cn_flags & flags); 701#ifndef NDEBUG 702 if (flags & LSCONN_CLOSING) 703 assert(0 == (conn->cn_flags & LSCONN_HASHED)); 704#endif 705 conn->cn_flags &= ~flags; 706 LSQ_DEBUG("decref conn %"PRIu64", '%s' -> '%s'", conn->cn_cid, 707 (refflags2str(conn->cn_flags | flags, str[0]), str[0]), 708 (refflags2str(conn->cn_flags, str[1]), str[1])); 709 if (0 == (conn->cn_flags & CONN_REF_FLAGS)) 710 { 711 eng_hist_inc(&engine->history, 0, sl_del_full_conns); 712 destroy_conn(engine, conn); 713 return NULL; 714 } 715 else 716 return conn; 717} 718 719 720/* This is not a general-purpose function. Only call from engine dtor. */ 721static void 722force_close_conn (lsquic_engine_t *engine, lsquic_conn_t *conn) 723{ 724 assert(engine->flags & ENG_DTOR); 725 const enum lsquic_conn_flags flags = conn->cn_flags; 726 assert(conn->cn_flags & CONN_REF_FLAGS); 727 assert(!(flags & LSCONN_HAS_OUTGOING)); /* Should be removed already */ 728 assert(!(flags & LSCONN_TICKABLE)); /* Should be removed already */ 729 assert(!(flags & LSCONN_CLOSING)); /* It is in transient queue? */ 730 if (flags & LSCONN_ATTQ) 731 { 732 attq_remove(engine->attq, conn); 733 (void) engine_decref_conn(engine, conn, LSCONN_ATTQ); 734 } 735 if (flags & LSCONN_HASHED) 736 remove_conn_from_hash(engine, conn); 737} 738 739 740/* Iterator for tickable connections (those on the Tickable Queue). Before 741 * a connection is returned, it is removed from the Advisory Tick Time queue 742 * if necessary. 743 */ 744static lsquic_conn_t * 745conn_iter_next_tickable (struct lsquic_engine *engine) 746{ 747 lsquic_conn_t *conn; 748 749 conn = lsquic_mh_pop(&engine->conns_tickable); 750 751 if (conn) 752 conn = engine_decref_conn(engine, conn, LSCONN_TICKABLE); 753 if (conn && (conn->cn_flags & LSCONN_ATTQ)) 754 { 755 attq_remove(engine->attq, conn); 756 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 757 } 758 759 return conn; 760} 761 762 763void 764lsquic_engine_process_conns (lsquic_engine_t *engine) 765{ 766 lsquic_conn_t *conn; 767 lsquic_time_t now; 768 769 ENGINE_IN(engine); 770 771 now = lsquic_time_now(); 772 while ((conn = attq_pop(engine->attq, now))) 773 { 774 conn = engine_decref_conn(engine, conn, LSCONN_ATTQ); 775 if (conn && !(conn->cn_flags & LSCONN_TICKABLE)) 776 { 777 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 778 engine_incref_conn(conn, LSCONN_TICKABLE); 779 } 780 } 781 782 process_connections(engine, conn_iter_next_tickable, now); 783 ENGINE_OUT(engine); 784} 785 786 787static ssize_t 788really_encrypt_packet (const lsquic_conn_t *conn, 789 struct lsquic_packet_out *packet_out, 790 unsigned char *buf, size_t bufsz) 791{ 792 int header_sz, is_hello_packet; 793 enum enc_level enc_level; 794 size_t packet_sz; 795 unsigned char header_buf[QUIC_MAX_PUBHDR_SZ]; 796 797 header_sz = conn->cn_pf->pf_gen_reg_pkt_header(conn, packet_out, 798 header_buf, sizeof(header_buf)); 799 if (header_sz < 0) 800 return -1; 801 802 is_hello_packet = !!(packet_out->po_flags & PO_HELLO); 803 enc_level = conn->cn_esf->esf_encrypt(conn->cn_enc_session, 804 conn->cn_version, 0, 805 packet_out->po_packno, header_buf, header_sz, 806 packet_out->po_data, packet_out->po_data_sz, 807 buf, bufsz, &packet_sz, is_hello_packet); 808 if ((int) enc_level >= 0) 809 { 810 lsquic_packet_out_set_enc_level(packet_out, enc_level); 811 LSQ_DEBUG("encrypted packet %"PRIu64"; plaintext is %zu bytes, " 812 "ciphertext is %zd bytes", 813 packet_out->po_packno, 814 conn->cn_pf->pf_packout_header_size(conn, packet_out->po_flags) + 815 packet_out->po_data_sz, 816 packet_sz); 817 return packet_sz; 818 } 819 else 820 return -1; 821} 822 823 824static enum { ENCPA_OK, ENCPA_NOMEM, ENCPA_BADCRYPT, } 825encrypt_packet (lsquic_engine_t *engine, const lsquic_conn_t *conn, 826 lsquic_packet_out_t *packet_out) 827{ 828 ssize_t enc_sz; 829 size_t bufsz; 830 unsigned sent_sz; 831 unsigned char *buf; 832 833 bufsz = conn->cn_pf->pf_packout_header_size(conn, packet_out->po_flags) + 834 packet_out->po_data_sz + QUIC_PACKET_HASH_SZ; 835 buf = engine->pub.enp_pmi->pmi_allocate(engine->pub.enp_pmi_ctx, bufsz); 836 if (!buf) 837 { 838 LSQ_DEBUG("could not allocate memory for outgoing packet of size %zd", 839 bufsz); 840 return ENCPA_NOMEM; 841 } 842 843 { 844 enc_sz = really_encrypt_packet(conn, packet_out, buf, bufsz); 845 sent_sz = enc_sz; 846 } 847 848 if (enc_sz < 0) 849 { 850 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, buf); 851 return ENCPA_BADCRYPT; 852 } 853 854 packet_out->po_enc_data = buf; 855 packet_out->po_enc_data_sz = enc_sz; 856 packet_out->po_sent_sz = sent_sz; 857 packet_out->po_flags |= PO_ENCRYPTED|PO_SENT_SZ; 858 859 return ENCPA_OK; 860} 861 862 863STAILQ_HEAD(conns_stailq, lsquic_conn); 864TAILQ_HEAD(conns_tailq, lsquic_conn); 865 866 867struct conns_out_iter 868{ 869 struct min_heap *coi_heap; 870 TAILQ_HEAD(, lsquic_conn) coi_active_list, 871 coi_inactive_list; 872 lsquic_conn_t *coi_next; 873#ifndef NDEBUG 874 lsquic_time_t coi_last_sent; 875#endif 876}; 877 878 879static void 880coi_init (struct conns_out_iter *iter, struct lsquic_engine *engine) 881{ 882 iter->coi_heap = &engine->conns_out; 883 iter->coi_next = NULL; 884 TAILQ_INIT(&iter->coi_active_list); 885 TAILQ_INIT(&iter->coi_inactive_list); 886#ifndef NDEBUG 887 iter->coi_last_sent = 0; 888#endif 889} 890 891 892static lsquic_conn_t * 893coi_next (struct conns_out_iter *iter) 894{ 895 lsquic_conn_t *conn; 896 897 if (lsquic_mh_count(iter->coi_heap) > 0) 898 { 899 conn = lsquic_mh_pop(iter->coi_heap); 900 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 901 conn->cn_flags |= LSCONN_COI_ACTIVE; 902#ifndef NDEBUG 903 if (iter->coi_last_sent) 904 assert(iter->coi_last_sent <= conn->cn_last_sent); 905 iter->coi_last_sent = conn->cn_last_sent; 906#endif 907 return conn; 908 } 909 else if (!TAILQ_EMPTY(&iter->coi_active_list)) 910 { 911 conn = iter->coi_next; 912 if (!conn) 913 conn = TAILQ_FIRST(&iter->coi_active_list); 914 if (conn) 915 iter->coi_next = TAILQ_NEXT(conn, cn_next_out); 916 return conn; 917 } 918 else 919 return NULL; 920} 921 922 923static void 924coi_deactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 925{ 926 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 927 { 928 assert(!TAILQ_EMPTY(&iter->coi_active_list)); 929 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 930 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 931 TAILQ_INSERT_TAIL(&iter->coi_inactive_list, conn, cn_next_out); 932 conn->cn_flags |= LSCONN_COI_INACTIVE; 933 } 934} 935 936 937static void 938coi_reactivate (struct conns_out_iter *iter, lsquic_conn_t *conn) 939{ 940 assert(conn->cn_flags & LSCONN_COI_INACTIVE); 941 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 942 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 943 TAILQ_INSERT_TAIL(&iter->coi_active_list, conn, cn_next_out); 944 conn->cn_flags |= LSCONN_COI_ACTIVE; 945} 946 947 948static void 949coi_reheap (struct conns_out_iter *iter, lsquic_engine_t *engine) 950{ 951 lsquic_conn_t *conn; 952 while ((conn = TAILQ_FIRST(&iter->coi_active_list))) 953 { 954 TAILQ_REMOVE(&iter->coi_active_list, conn, cn_next_out); 955 conn->cn_flags &= ~LSCONN_COI_ACTIVE; 956 lsquic_mh_insert(iter->coi_heap, conn, conn->cn_last_sent); 957 } 958 while ((conn = TAILQ_FIRST(&iter->coi_inactive_list))) 959 { 960 TAILQ_REMOVE(&iter->coi_inactive_list, conn, cn_next_out); 961 conn->cn_flags &= ~LSCONN_COI_INACTIVE; 962 (void) engine_decref_conn(engine, conn, LSCONN_HAS_OUTGOING); 963 } 964} 965 966 967static unsigned 968send_batch (lsquic_engine_t *engine, struct conns_out_iter *conns_iter, 969 struct out_batch *batch, unsigned n_to_send) 970{ 971 int n_sent, i; 972 lsquic_time_t now; 973 974 /* Set sent time before the write to avoid underestimating RTT */ 975 now = lsquic_time_now(); 976 for (i = 0; i < (int) n_to_send; ++i) 977 batch->packets[i]->po_sent = now; 978 n_sent = engine->packets_out(engine->packets_out_ctx, batch->outs, 979 n_to_send); 980 if (n_sent >= 0) 981 LSQ_DEBUG("packets out returned %d (out of %u)", n_sent, n_to_send); 982 else 983 { 984 engine->pub.enp_flags &= ~ENPUB_CAN_SEND; 985 LSQ_DEBUG("packets out returned an error: %s", strerror(errno)); 986 EV_LOG_GENERIC_EVENT("cannot send packets"); 987 n_sent = 0; 988 } 989 if (n_sent > 0) 990 engine->last_sent = now + n_sent; 991 for (i = 0; i < n_sent; ++i) 992 { 993 eng_hist_inc(&engine->history, now, sl_packets_out); 994 EV_LOG_PACKET_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 995 batch->conns[i]->cn_if->ci_packet_sent(batch->conns[i], 996 batch->packets[i]); 997 /* `i' is added to maintain relative order */ 998 batch->conns[i]->cn_last_sent = now + i; 999 /* Release packet out buffer as soon as the packet is sent 1000 * successfully. If not successfully sent, we hold on to 1001 * this buffer until the packet sending is attempted again 1002 * or until it times out and regenerated. 1003 */ 1004 if (batch->packets[i]->po_flags & PO_ENCRYPTED) 1005 { 1006 batch->packets[i]->po_flags &= ~PO_ENCRYPTED; 1007 engine->pub.enp_pmi->pmi_release(engine->pub.enp_pmi_ctx, 1008 batch->packets[i]->po_enc_data); 1009 batch->packets[i]->po_enc_data = NULL; /* JIC */ 1010 } 1011 } 1012 if (LSQ_LOG_ENABLED_EXT(LSQ_LOG_DEBUG, LSQLM_EVENT)) 1013 for ( ; i < (int) n_to_send; ++i) 1014 EV_LOG_PACKET_NOT_SENT(batch->conns[i]->cn_cid, batch->packets[i]); 1015 /* Return packets to the connection in reverse order so that the packet 1016 * ordering is maintained. 1017 */ 1018 for (i = (int) n_to_send - 1; i >= n_sent; --i) 1019 { 1020 batch->conns[i]->cn_if->ci_packet_not_sent(batch->conns[i], 1021 batch->packets[i]); 1022 if (!(batch->conns[i]->cn_flags & (LSCONN_COI_ACTIVE|LSCONN_EVANESCENT))) 1023 coi_reactivate(conns_iter, batch->conns[i]); 1024 } 1025 return n_sent; 1026} 1027 1028 1029/* Return 1 if went past deadline, 0 otherwise */ 1030static int 1031check_deadline (lsquic_engine_t *engine) 1032{ 1033 if (engine->pub.enp_settings.es_proc_time_thresh && 1034 lsquic_time_now() > engine->deadline) 1035 { 1036 LSQ_INFO("went past threshold of %u usec, stop sending", 1037 engine->pub.enp_settings.es_proc_time_thresh); 1038 engine->flags |= ENG_PAST_DEADLINE; 1039 return 1; 1040 } 1041 else 1042 return 0; 1043} 1044 1045 1046static void 1047send_packets_out (struct lsquic_engine *engine, 1048 struct conns_tailq *ticked_conns, 1049 struct conns_stailq *closed_conns) 1050{ 1051 unsigned n, w, n_sent, n_batches_sent; 1052 lsquic_packet_out_t *packet_out; 1053 lsquic_conn_t *conn; 1054 struct out_batch *const batch = &engine->out_batch; 1055 struct conns_out_iter conns_iter; 1056 int shrink, deadline_exceeded; 1057 1058 coi_init(&conns_iter, engine); 1059 n_batches_sent = 0; 1060 n_sent = 0, n = 0; 1061 shrink = 0; 1062 deadline_exceeded = 0; 1063 1064 while ((conn = coi_next(&conns_iter))) 1065 { 1066 packet_out = conn->cn_if->ci_next_packet_to_send(conn); 1067 if (!packet_out) { 1068 LSQ_DEBUG("batched all outgoing packets for conn %"PRIu64, 1069 conn->cn_cid); 1070 coi_deactivate(&conns_iter, conn); 1071 continue; 1072 } 1073 if (!(packet_out->po_flags & (PO_ENCRYPTED|PO_NOENCRYPT))) 1074 { 1075 switch (encrypt_packet(engine, conn, packet_out)) 1076 { 1077 case ENCPA_NOMEM: 1078 /* Send what we have and wait for a more opportune moment */ 1079 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1080 goto end_for; 1081 case ENCPA_BADCRYPT: 1082 /* This is pretty bad: close connection immediately */ 1083 conn->cn_if->ci_packet_not_sent(conn, packet_out); 1084 LSQ_INFO("conn %"PRIu64" has unsendable packets", conn->cn_cid); 1085 if (!(conn->cn_flags & LSCONN_EVANESCENT)) 1086 { 1087 if (!(conn->cn_flags & LSCONN_CLOSING)) 1088 { 1089 STAILQ_INSERT_TAIL(closed_conns, conn, cn_next_closed_conn); 1090 engine_incref_conn(conn, LSCONN_CLOSING); 1091 if (conn->cn_flags & LSCONN_HASHED) 1092 remove_conn_from_hash(engine, conn); 1093 } 1094 coi_deactivate(&conns_iter, conn); 1095 if (conn->cn_flags & LSCONN_TICKED) 1096 { 1097 TAILQ_REMOVE(ticked_conns, conn, cn_next_ticked); 1098 engine_decref_conn(engine, conn, LSCONN_TICKED); 1099 } 1100 } 1101 continue; 1102 case ENCPA_OK: 1103 break; 1104 } 1105 } 1106 LSQ_DEBUG("batched packet %"PRIu64" for connection %"PRIu64, 1107 packet_out->po_packno, conn->cn_cid); 1108 assert(conn->cn_flags & LSCONN_HAS_PEER_SA); 1109 if (packet_out->po_flags & PO_ENCRYPTED) 1110 { 1111 batch->outs[n].buf = packet_out->po_enc_data; 1112 batch->outs[n].sz = packet_out->po_enc_data_sz; 1113 } 1114 else 1115 { 1116 batch->outs[n].buf = packet_out->po_data; 1117 batch->outs[n].sz = packet_out->po_data_sz; 1118 } 1119 batch->outs [n].peer_ctx = conn->cn_peer_ctx; 1120 batch->outs [n].local_sa = (struct sockaddr *) conn->cn_local_addr; 1121 batch->outs [n].dest_sa = (struct sockaddr *) conn->cn_peer_addr; 1122 batch->conns [n] = conn; 1123 batch->packets[n] = packet_out; 1124 ++n; 1125 if (n == engine->batch_size) 1126 { 1127 n = 0; 1128 w = send_batch(engine, &conns_iter, batch, engine->batch_size); 1129 ++n_batches_sent; 1130 n_sent += w; 1131 if (w < engine->batch_size) 1132 { 1133 shrink = 1; 1134 break; 1135 } 1136 deadline_exceeded = check_deadline(engine); 1137 if (deadline_exceeded) 1138 break; 1139 grow_batch_size(engine); 1140 } 1141 } 1142 end_for: 1143 1144 if (n > 0) { 1145 w = send_batch(engine, &conns_iter, batch, n); 1146 n_sent += w; 1147 shrink = w < n; 1148 ++n_batches_sent; 1149 deadline_exceeded = check_deadline(engine); 1150 } 1151 1152 if (shrink) 1153 shrink_batch_size(engine); 1154 else if (n_batches_sent > 1 && !deadline_exceeded) 1155 grow_batch_size(engine); 1156 1157 coi_reheap(&conns_iter, engine); 1158 1159 LSQ_DEBUG("%s: sent %u packet%.*s", __func__, n_sent, n_sent != 1, "s"); 1160} 1161 1162 1163int 1164lsquic_engine_has_unsent_packets (lsquic_engine_t *engine) 1165{ 1166 return lsquic_mh_count(&engine->conns_out) > 0 1167 ; 1168} 1169 1170 1171static void 1172reset_deadline (lsquic_engine_t *engine, lsquic_time_t now) 1173{ 1174 engine->deadline = now + engine->pub.enp_settings.es_proc_time_thresh; 1175 engine->flags &= ~ENG_PAST_DEADLINE; 1176} 1177 1178 1179/* TODO: this is a user-facing function, account for load */ 1180void 1181lsquic_engine_send_unsent_packets (lsquic_engine_t *engine) 1182{ 1183 lsquic_conn_t *conn; 1184 struct conns_stailq closed_conns; 1185 struct conns_tailq ticked_conns = TAILQ_HEAD_INITIALIZER(ticked_conns); 1186 1187 STAILQ_INIT(&closed_conns); 1188 reset_deadline(engine, lsquic_time_now()); 1189 if (!(engine->pub.enp_flags & ENPUB_CAN_SEND)) 1190 { 1191 LSQ_DEBUG("can send again"); 1192 EV_LOG_GENERIC_EVENT("can send again"); 1193 engine->pub.enp_flags |= ENPUB_CAN_SEND; 1194 } 1195 1196 send_packets_out(engine, &ticked_conns, &closed_conns); 1197 1198 while ((conn = STAILQ_FIRST(&closed_conns))) { 1199 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1200 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1201 } 1202 1203} 1204 1205 1206static void 1207process_connections (lsquic_engine_t *engine, conn_iter_f next_conn, 1208 lsquic_time_t now) 1209{ 1210 lsquic_conn_t *conn; 1211 enum tick_st tick_st; 1212 unsigned i; 1213 lsquic_time_t next_tick_time; 1214 struct conns_stailq closed_conns; 1215 struct conns_tailq ticked_conns; 1216 1217 eng_hist_tick(&engine->history, now); 1218 1219 STAILQ_INIT(&closed_conns); 1220 TAILQ_INIT(&ticked_conns); 1221 reset_deadline(engine, now); 1222 1223 i = 0; 1224 while ((conn = next_conn(engine)) 1225 ) 1226 { 1227 tick_st = conn->cn_if->ci_tick(conn, now); 1228 conn->cn_last_ticked = now + i /* Maintain relative order */ ++; 1229 if (tick_st & TICK_SEND) 1230 { 1231 if (!(conn->cn_flags & LSCONN_HAS_OUTGOING)) 1232 { 1233 lsquic_mh_insert(&engine->conns_out, conn, conn->cn_last_sent); 1234 engine_incref_conn(conn, LSCONN_HAS_OUTGOING); 1235 } 1236 } 1237 if (tick_st & TICK_CLOSE) 1238 { 1239 STAILQ_INSERT_TAIL(&closed_conns, conn, cn_next_closed_conn); 1240 engine_incref_conn(conn, LSCONN_CLOSING); 1241 if (conn->cn_flags & LSCONN_HASHED) 1242 remove_conn_from_hash(engine, conn); 1243 } 1244 else 1245 { 1246 TAILQ_INSERT_TAIL(&ticked_conns, conn, cn_next_ticked); 1247 engine_incref_conn(conn, LSCONN_TICKED); 1248 } 1249 } 1250 1251 if ((engine->pub.enp_flags & ENPUB_CAN_SEND) 1252 && lsquic_engine_has_unsent_packets(engine)) 1253 send_packets_out(engine, &ticked_conns, &closed_conns); 1254 1255 while ((conn = STAILQ_FIRST(&closed_conns))) { 1256 STAILQ_REMOVE_HEAD(&closed_conns, cn_next_closed_conn); 1257 (void) engine_decref_conn(engine, conn, LSCONN_CLOSING); 1258 } 1259 1260 /* TODO Heapification can be optimized by switching to the Floyd method: 1261 * https://en.wikipedia.org/wiki/Binary_heap#Building_a_heap 1262 */ 1263 while ((conn = TAILQ_FIRST(&ticked_conns))) 1264 { 1265 TAILQ_REMOVE(&ticked_conns, conn, cn_next_ticked); 1266 engine_decref_conn(engine, conn, LSCONN_TICKED); 1267 if (!(conn->cn_flags & LSCONN_TICKABLE) 1268 && conn->cn_if->ci_is_tickable(conn)) 1269 { 1270 lsquic_mh_insert(&engine->conns_tickable, conn, conn->cn_last_ticked); 1271 engine_incref_conn(conn, LSCONN_TICKABLE); 1272 } 1273 else if (!(conn->cn_flags & LSCONN_ATTQ)) 1274 { 1275 next_tick_time = conn->cn_if->ci_next_tick_time(conn); 1276 if (next_tick_time) 1277 { 1278 if (0 == attq_add(engine->attq, conn, next_tick_time)) 1279 engine_incref_conn(conn, LSCONN_ATTQ); 1280 } 1281 else 1282 assert(0); 1283 } 1284 } 1285 1286} 1287 1288 1289/* Return 0 if packet is being processed by a real connection, 1 if the 1290 * packet was processed, but not by a connection, and -1 on error. 1291 */ 1292int 1293lsquic_engine_packet_in (lsquic_engine_t *engine, 1294 const unsigned char *packet_in_data, size_t packet_in_size, 1295 const struct sockaddr *sa_local, const struct sockaddr *sa_peer, 1296 void *peer_ctx) 1297{ 1298 struct packin_parse_state ppstate; 1299 lsquic_packet_in_t *packet_in; 1300 int (*parse_packet_in_begin) (struct lsquic_packet_in *, size_t length, 1301 int is_server, struct packin_parse_state *); 1302 1303 if (packet_in_size > QUIC_MAX_PACKET_SZ) 1304 { 1305 LSQ_DEBUG("Cannot handle packet_in_size(%zd) > %d packet incoming " 1306 "packet's header", packet_in_size, QUIC_MAX_PACKET_SZ); 1307 errno = E2BIG; 1308 return -1; 1309 } 1310 1311 if (conn_hash_using_addr(&engine->conns_hash)) 1312 { 1313 const struct lsquic_conn *conn; 1314 conn = conn_hash_find_by_addr(&engine->conns_hash, sa_local); 1315 if (!conn) 1316 return -1; 1317 if ((1 << conn->cn_version) & LSQUIC_GQUIC_HEADER_VERSIONS) 1318 parse_packet_in_begin = lsquic_gquic_parse_packet_in_begin; 1319 else 1320 parse_packet_in_begin = lsquic_iquic_parse_packet_in_begin; 1321 } 1322 else 1323 parse_packet_in_begin = lsquic_parse_packet_in_begin; 1324 1325 packet_in = lsquic_mm_get_packet_in(&engine->pub.enp_mm); 1326 if (!packet_in) 1327 return -1; 1328 1329 /* Library does not modify packet_in_data, it is not referenced after 1330 * this function returns and subsequent release of pi_data is guarded 1331 * by PI_OWN_DATA flag. 1332 */ 1333 packet_in->pi_data = (unsigned char *) packet_in_data; 1334 if (0 != parse_packet_in_begin(packet_in, packet_in_size, 1335 engine->flags & ENG_SERVER, &ppstate)) 1336 { 1337 LSQ_DEBUG("Cannot parse incoming packet's header"); 1338 lsquic_mm_put_packet_in(&engine->pub.enp_mm, packet_in); 1339 errno = EINVAL; 1340 return -1; 1341 } 1342 1343 packet_in->pi_received = lsquic_time_now(); 1344 eng_hist_inc(&engine->history, packet_in->pi_received, sl_packets_in); 1345 return process_packet_in(engine, packet_in, &ppstate, sa_local, sa_peer, 1346 peer_ctx); 1347} 1348 1349 1350#if __GNUC__ && !defined(NDEBUG) 1351__attribute__((weak)) 1352#endif 1353unsigned 1354lsquic_engine_quic_versions (const lsquic_engine_t *engine) 1355{ 1356 return engine->pub.enp_settings.es_versions; 1357} 1358 1359 1360int 1361lsquic_engine_earliest_adv_tick (lsquic_engine_t *engine, int *diff) 1362{ 1363 const lsquic_time_t *next_time; 1364 lsquic_time_t now; 1365 1366 if (((engine->flags & ENG_PAST_DEADLINE) 1367 && lsquic_mh_count(&engine->conns_out)) 1368 || lsquic_mh_count(&engine->conns_tickable)) 1369 { 1370 *diff = 0; 1371 return 1; 1372 } 1373 1374 next_time = attq_next_time(engine->attq); 1375 if (!next_time) 1376 return 0; 1377 1378 now = lsquic_time_now(); 1379 *diff = (int) ((int64_t) *next_time - (int64_t) now); 1380 return 1; 1381} 1382 1383 1384unsigned 1385lsquic_engine_count_attq (lsquic_engine_t *engine, int from_now) 1386{ 1387 lsquic_time_t now; 1388 now = lsquic_time_now(); 1389 if (from_now < 0) 1390 now -= from_now; 1391 else 1392 now += from_now; 1393 return attq_count_before(engine->attq, now); 1394} 1395