1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/udp.h> 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88 { 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 92 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 93 stcb); 94 if (stcb == NULL) { 95 SCTP_INP_RLOCK(inp); 96 } 97 /* validate length */ 98 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 99 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 100 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 101 vrf_id, port); 102 if (stcb) 103 *abort_no_unlock = 1; 104 goto outnow; 105 } 106 /* validate parameters */ 107 init = &cp->init; 108 if (init->initiate_tag == 0) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 111 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 112 vrf_id, port); 113 if (stcb) 114 *abort_no_unlock = 1; 115 goto outnow; 116 } 117 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 118 /* invalid parameter... send abort */ 119 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 121 vrf_id, port); 122 if (stcb) 123 *abort_no_unlock = 1; 124 goto outnow; 125 } 126 if (init->num_inbound_streams == 0) { 127 /* protocol error... send abort */ 128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_outbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 138 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 139 vrf_id, port); 140 if (stcb) 141 *abort_no_unlock = 1; 142 goto outnow; 143 } 144 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 145 offset + ntohs(cp->ch.chunk_length))) { 146 /* auth parameter(s) error... send abort */ 147 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 /* 153 * We are only accepting if we have a socket with positive 154 * so_qlimit. 155 */ 156 if ((stcb == NULL) && 157 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 158 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 159 (inp->sctp_socket == NULL) || 160 (inp->sctp_socket->so_qlimit == 0))) { 161 /* 162 * FIX ME ?? What about TCP model and we have a 163 * match/restart case? Actually no fix is needed. the lookup 164 * will always find the existing assoc so stcb would not be 165 * NULL. It may be questionable to do this since we COULD 166 * just send back the INIT-ACK and hope that the app did 167 * accept()'s by the time the COOKIE was sent. But there is 168 * a price to pay for COOKIE generation and I don't want to 169 * pay it on the chance that the app will actually do some 170 * accepts(). The App just looses and should NOT be in this 171 * state :-) 172 */ 173 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 174 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 175 } 176 goto outnow; 177 } 178 if ((stcb != NULL) && 179 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 180 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 181 sctp_send_shutdown_ack(stcb, NULL); 182 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 183 } else { 184 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 185 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 186 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 187 } 188 outnow: 189 if (stcb == NULL) { 190 SCTP_INP_RUNLOCK(inp); 191 } 192 } 193 194 /* 195 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 196 */ 197 198 int 199 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 200 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 201 SCTP_UNUSED 202 #endif 203 ) 204 { 205 int unsent_data = 0; 206 unsigned int i; 207 struct sctp_stream_queue_pending *sp; 208 struct sctp_association *asoc; 209 210 /* 211 * This function returns the number of streams that have true unsent 212 * data on them. Note that as it looks through it will clean up any 213 * places that have old data that has been sent but left at top of 214 * stream queue. 215 */ 216 asoc = &stcb->asoc; 217 SCTP_TCB_SEND_LOCK(stcb); 218 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 219 /* Check to see if some data queued */ 220 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 221 /* sa_ignore FREED_MEMORY */ 222 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 223 if (sp == NULL) { 224 continue; 225 } 226 if ((sp->msg_is_complete) && 227 (sp->length == 0) && 228 (sp->sender_all_done)) { 229 /* 230 * We are doing differed cleanup. Last time 231 * through when we took all the data the 232 * sender_all_done was not set. 233 */ 234 if (sp->put_last_out == 0) { 235 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 236 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 237 sp->sender_all_done, 238 sp->length, 239 sp->msg_is_complete, 240 sp->put_last_out); 241 } 242 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 243 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 244 if (sp->net) { 245 sctp_free_remote_addr(sp->net); 246 sp->net = NULL; 247 } 248 if (sp->data) { 249 sctp_m_freem(sp->data); 250 sp->data = NULL; 251 } 252 sctp_free_a_strmoq(stcb, sp, so_locked); 253 } else { 254 unsent_data++; 255 break; 256 } 257 } 258 } 259 SCTP_TCB_SEND_UNLOCK(stcb); 260 return (unsent_data); 261 } 262 263 static int 264 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 265 { 266 struct sctp_init *init; 267 struct sctp_association *asoc; 268 struct sctp_nets *lnet; 269 unsigned int i; 270 271 init = &cp->init; 272 asoc = &stcb->asoc; 273 /* save off parameters */ 274 asoc->peer_vtag = ntohl(init->initiate_tag); 275 asoc->peers_rwnd = ntohl(init->a_rwnd); 276 /* init tsn's */ 277 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 278 279 if (!TAILQ_EMPTY(&asoc->nets)) { 280 /* update any ssthresh's that may have a default */ 281 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 282 lnet->ssthresh = asoc->peers_rwnd; 283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 284 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 285 } 286 } 287 } 288 SCTP_TCB_SEND_LOCK(stcb); 289 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 290 unsigned int newcnt; 291 struct sctp_stream_out *outs; 292 struct sctp_stream_queue_pending *sp, *nsp; 293 struct sctp_tmit_chunk *chk, *nchk; 294 295 /* abandon the upper streams */ 296 newcnt = ntohs(init->num_inbound_streams); 297 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 298 if (chk->rec.data.stream_number >= newcnt) { 299 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 300 asoc->send_queue_cnt--; 301 if (chk->data != NULL) { 302 sctp_free_bufspace(stcb, asoc, chk, 1); 303 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 304 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 305 if (chk->data) { 306 sctp_m_freem(chk->data); 307 chk->data = NULL; 308 } 309 } 310 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 311 /* sa_ignore FREED_MEMORY */ 312 } 313 } 314 if (asoc->strmout) { 315 for (i = newcnt; i < asoc->pre_open_streams; i++) { 316 outs = &asoc->strmout[i]; 317 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 318 TAILQ_REMOVE(&outs->outqueue, sp, next); 319 asoc->stream_queue_cnt--; 320 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 321 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 322 sp, SCTP_SO_NOT_LOCKED); 323 if (sp->data) { 324 sctp_m_freem(sp->data); 325 sp->data = NULL; 326 } 327 if (sp->net) { 328 sctp_free_remote_addr(sp->net); 329 sp->net = NULL; 330 } 331 /* Free the chunk */ 332 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 333 /* sa_ignore FREED_MEMORY */ 334 } 335 } 336 } 337 /* cut back the count */ 338 asoc->pre_open_streams = newcnt; 339 } 340 SCTP_TCB_SEND_UNLOCK(stcb); 341 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 342 343 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 344 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 345 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 346 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 347 } 348 /* This is the next one we expect */ 349 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 350 351 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 352 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 353 354 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 355 /* open the requested streams */ 356 357 if (asoc->strmin != NULL) { 358 /* Free the old ones */ 359 struct sctp_queued_to_read *ctl, *nctl; 360 361 for (i = 0; i < asoc->streamincnt; i++) { 362 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 363 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 364 sctp_free_remote_addr(ctl->whoFrom); 365 ctl->whoFrom = NULL; 366 sctp_m_freem(ctl->data); 367 ctl->data = NULL; 368 sctp_free_a_readq(stcb, ctl); 369 } 370 } 371 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 372 } 373 asoc->streamincnt = ntohs(init->num_outbound_streams); 374 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 375 asoc->streamincnt = MAX_SCTP_STREAMS; 376 } 377 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 378 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 379 if (asoc->strmin == NULL) { 380 /* we didn't get memory for the streams! */ 381 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 382 return (-1); 383 } 384 for (i = 0; i < asoc->streamincnt; i++) { 385 asoc->strmin[i].stream_no = i; 386 asoc->strmin[i].last_sequence_delivered = 0xffff; 387 /* 388 * U-stream ranges will be set when the cookie is unpacked. 389 * Or for the INIT sender they are un set (if pr-sctp not 390 * supported) when the INIT-ACK arrives. 391 */ 392 TAILQ_INIT(&asoc->strmin[i].inqueue); 393 asoc->strmin[i].delivery_started = 0; 394 } 395 /* 396 * load_address_from_init will put the addresses into the 397 * association when the COOKIE is processed or the INIT-ACK is 398 * processed. Both types of COOKIE's existing and new call this 399 * routine. It will remove addresses that are no longer in the 400 * association (for the restarting case where addresses are 401 * removed). Up front when the INIT arrives we will discard it if it 402 * is a restart and new addresses have been added. 403 */ 404 /* sa_ignore MEMLEAK */ 405 return (0); 406 } 407 408 /* 409 * INIT-ACK message processing/consumption returns value < 0 on error 410 */ 411 static int 412 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 413 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 414 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 415 { 416 struct sctp_association *asoc; 417 struct mbuf *op_err; 418 int retval, abort_flag; 419 uint32_t initack_limit; 420 int nat_friendly = 0; 421 422 /* First verify that we have no illegal param's */ 423 abort_flag = 0; 424 op_err = NULL; 425 426 op_err = sctp_arethere_unrecognized_parameters(m, 427 (offset + sizeof(struct sctp_init_chunk)), 428 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 429 if (abort_flag) { 430 /* Send an abort and notify peer */ 431 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 432 *abort_no_unlock = 1; 433 return (-1); 434 } 435 asoc = &stcb->asoc; 436 asoc->peer_supports_nat = (uint8_t) nat_friendly; 437 /* process the peer's parameters in the INIT-ACK */ 438 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 439 if (retval < 0) { 440 return (retval); 441 } 442 initack_limit = offset + ntohs(cp->ch.chunk_length); 443 /* load all addresses */ 444 if ((retval = sctp_load_addresses_from_init(stcb, m, 445 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 446 NULL))) { 447 /* Huh, we should abort */ 448 SCTPDBG(SCTP_DEBUG_INPUT1, 449 "Load addresses from INIT causes an abort %d\n", 450 retval); 451 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 452 NULL, 0, net->port); 453 *abort_no_unlock = 1; 454 return (-1); 455 } 456 /* if the peer doesn't support asconf, flush the asconf queue */ 457 if (asoc->peer_supports_asconf == 0) { 458 struct sctp_asconf_addr *param, *nparam; 459 460 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 461 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 462 SCTP_FREE(param, SCTP_M_ASC_ADDR); 463 } 464 } 465 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 466 stcb->asoc.local_hmacs); 467 if (op_err) { 468 sctp_queue_op_err(stcb, op_err); 469 /* queuing will steal away the mbuf chain to the out queue */ 470 op_err = NULL; 471 } 472 /* extract the cookie and queue it to "echo" it back... */ 473 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 474 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 475 stcb->asoc.overall_error_count, 476 0, 477 SCTP_FROM_SCTP_INPUT, 478 __LINE__); 479 } 480 stcb->asoc.overall_error_count = 0; 481 net->error_count = 0; 482 483 /* 484 * Cancel the INIT timer, We do this first before queueing the 485 * cookie. We always cancel at the primary to assue that we are 486 * canceling the timer started by the INIT which always goes to the 487 * primary. 488 */ 489 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 490 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 491 492 /* calculate the RTO */ 493 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 494 SCTP_RTT_FROM_NON_DATA); 495 496 retval = sctp_send_cookie_echo(m, offset, stcb, net); 497 if (retval < 0) { 498 /* 499 * No cookie, we probably should send a op error. But in any 500 * case if there is no cookie in the INIT-ACK, we can 501 * abandon the peer, its broke. 502 */ 503 if (retval == -3) { 504 /* We abort with an error of missing mandatory param */ 505 op_err = 506 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 507 if (op_err) { 508 /* 509 * Expand beyond to include the mandatory 510 * param cookie 511 */ 512 struct sctp_inv_mandatory_param *mp; 513 514 SCTP_BUF_LEN(op_err) = 515 sizeof(struct sctp_inv_mandatory_param); 516 mp = mtod(op_err, 517 struct sctp_inv_mandatory_param *); 518 /* Subtract the reserved param */ 519 mp->length = 520 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 521 mp->num_param = htonl(1); 522 mp->param = htons(SCTP_STATE_COOKIE); 523 mp->resv = 0; 524 } 525 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 526 sh, op_err, vrf_id, net->port); 527 *abort_no_unlock = 1; 528 } 529 return (retval); 530 } 531 return (0); 532 } 533 534 static void 535 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 536 struct sctp_tcb *stcb, struct sctp_nets *net) 537 { 538 struct sockaddr_storage store; 539 struct sctp_nets *r_net, *f_net; 540 struct timeval tv; 541 int req_prim = 0; 542 uint16_t old_error_counter; 543 544 #ifdef INET 545 struct sockaddr_in *sin; 546 547 #endif 548 #ifdef INET6 549 struct sockaddr_in6 *sin6; 550 551 #endif 552 553 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 554 /* Invalid length */ 555 return; 556 } 557 memset(&store, 0, sizeof(store)); 558 switch (cp->heartbeat.hb_info.addr_family) { 559 #ifdef INET 560 case AF_INET: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 562 sin = (struct sockaddr_in *)&store; 563 sin->sin_family = cp->heartbeat.hb_info.addr_family; 564 sin->sin_len = cp->heartbeat.hb_info.addr_len; 565 sin->sin_port = stcb->rport; 566 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 567 sizeof(sin->sin_addr)); 568 } else { 569 return; 570 } 571 break; 572 #endif 573 #ifdef INET6 574 case AF_INET6: 575 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 576 sin6 = (struct sockaddr_in6 *)&store; 577 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 578 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 579 sin6->sin6_port = stcb->rport; 580 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 581 sizeof(sin6->sin6_addr)); 582 } else { 583 return; 584 } 585 break; 586 #endif 587 default: 588 return; 589 } 590 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 591 if (r_net == NULL) { 592 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 593 return; 594 } 595 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 596 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 597 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 598 /* 599 * If the its a HB and it's random value is correct when can 600 * confirm the destination. 601 */ 602 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 603 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 604 stcb->asoc.primary_destination = r_net; 605 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 606 f_net = TAILQ_FIRST(&stcb->asoc.nets); 607 if (f_net != r_net) { 608 /* 609 * first one on the list is NOT the primary 610 * sctp_cmpaddr() is much more efficent if 611 * the primary is the first on the list, 612 * make it so. 613 */ 614 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 615 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 616 } 617 req_prim = 1; 618 } 619 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 620 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 621 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 622 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 623 } 624 old_error_counter = r_net->error_count; 625 r_net->error_count = 0; 626 r_net->hb_responded = 1; 627 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 628 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 629 /* Now lets do a RTO with this */ 630 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 631 SCTP_RTT_FROM_NON_DATA); 632 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 633 r_net->dest_state |= SCTP_ADDR_REACHABLE; 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 635 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 } 637 if (r_net->dest_state & SCTP_ADDR_PF) { 638 r_net->dest_state &= ~SCTP_ADDR_PF; 639 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 640 } 641 if (old_error_counter > 0) { 642 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 643 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 644 } 645 if (r_net == stcb->asoc.primary_destination) { 646 if (stcb->asoc.alternate) { 647 /* release the alternate, primary is good */ 648 sctp_free_remote_addr(stcb->asoc.alternate); 649 stcb->asoc.alternate = NULL; 650 } 651 } 652 /* Mobility adaptation */ 653 if (req_prim) { 654 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 655 SCTP_MOBILITY_BASE) || 656 sctp_is_mobility_feature_on(stcb->sctp_ep, 657 SCTP_MOBILITY_FASTHANDOFF)) && 658 sctp_is_mobility_feature_on(stcb->sctp_ep, 659 SCTP_MOBILITY_PRIM_DELETED)) { 660 661 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_FASTHANDOFF)) { 664 sctp_assoc_immediate_retrans(stcb, 665 stcb->asoc.primary_destination); 666 } 667 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_BASE)) { 669 sctp_move_chunks_from_net(stcb, 670 stcb->asoc.deleted_primary); 671 } 672 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 673 stcb->asoc.deleted_primary); 674 } 675 } 676 } 677 678 static int 679 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 680 { 681 /* 682 * return 0 means we want you to proceed with the abort non-zero 683 * means no abort processing 684 */ 685 struct sctpasochead *head; 686 687 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 688 /* generate a new vtag and send init */ 689 LIST_REMOVE(stcb, sctp_asocs); 690 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 691 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 692 /* 693 * put it in the bucket in the vtag hash of assoc's for the 694 * system 695 */ 696 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 697 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 698 return (1); 699 } 700 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 701 /* 702 * treat like a case where the cookie expired i.e.: - dump 703 * current cookie. - generate a new vtag. - resend init. 704 */ 705 /* generate a new vtag and send init */ 706 LIST_REMOVE(stcb, sctp_asocs); 707 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 708 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 709 sctp_stop_all_cookie_timers(stcb); 710 sctp_toss_old_cookies(stcb, &stcb->asoc); 711 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 712 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 713 /* 714 * put it in the bucket in the vtag hash of assoc's for the 715 * system 716 */ 717 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 718 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 719 return (1); 720 } 721 return (0); 722 } 723 724 static int 725 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 726 struct sctp_nets *net) 727 { 728 /* 729 * return 0 means we want you to proceed with the abort non-zero 730 * means no abort processing 731 */ 732 if (stcb->asoc.peer_supports_auth == 0) { 733 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 734 return (0); 735 } 736 sctp_asconf_send_nat_state_update(stcb, net); 737 return (1); 738 } 739 740 741 static void 742 sctp_handle_abort(struct sctp_abort_chunk *cp, 743 struct sctp_tcb *stcb, struct sctp_nets *net) 744 { 745 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 746 struct socket *so; 747 748 #endif 749 uint16_t len; 750 751 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 752 if (stcb == NULL) 753 return; 754 755 len = ntohs(cp->ch.chunk_length); 756 if (len > sizeof(struct sctp_chunkhdr)) { 757 /* 758 * Need to check the cause codes for our two magic nat 759 * aborts which don't kill the assoc necessarily. 760 */ 761 struct sctp_abort_chunk *cpnext; 762 struct sctp_missing_nat_state *natc; 763 uint16_t cause; 764 765 cpnext = cp; 766 cpnext++; 767 natc = (struct sctp_missing_nat_state *)cpnext; 768 cause = ntohs(natc->cause); 769 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 771 cp->ch.chunk_flags); 772 if (sctp_handle_nat_colliding_state(stcb)) { 773 return; 774 } 775 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 776 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 777 cp->ch.chunk_flags); 778 if (sctp_handle_nat_missing_state(stcb, net)) { 779 return; 780 } 781 } 782 } 783 /* stop any receive timers */ 784 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 785 /* notify user of the abort and clean up... */ 786 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 787 /* free the tcb */ 788 #if defined(SCTP_PANIC_ON_ABORT) 789 printf("stcb:%p state:%d rport:%d net:%p\n", 790 stcb, stcb->asoc.state, stcb->rport, net); 791 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 792 panic("Received an ABORT"); 793 } else { 794 printf("No panic its in state %x closed\n", stcb->asoc.state); 795 } 796 #endif 797 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 798 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 799 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 800 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 801 } 802 #ifdef SCTP_ASOCLOG_OF_TSNS 803 sctp_print_out_track_log(stcb); 804 #endif 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 so = SCTP_INP_SO(stcb->sctp_ep); 807 atomic_add_int(&stcb->asoc.refcnt, 1); 808 SCTP_TCB_UNLOCK(stcb); 809 SCTP_SOCKET_LOCK(so, 1); 810 SCTP_TCB_LOCK(stcb); 811 atomic_subtract_int(&stcb->asoc.refcnt, 1); 812 #endif 813 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 814 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 815 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 816 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 817 SCTP_SOCKET_UNLOCK(so, 1); 818 #endif 819 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 820 } 821 822 static void 823 sctp_start_net_timers(struct sctp_tcb *stcb) 824 { 825 uint32_t cnt_hb_sent; 826 struct sctp_nets *net; 827 828 cnt_hb_sent = 0; 829 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 830 /* 831 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 832 * If the dest in unconfirmed send a hb as well if under 833 * max_hb_burst have been sent. 834 */ 835 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 836 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 837 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 838 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 839 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 840 cnt_hb_sent++; 841 } 842 } 843 if (cnt_hb_sent) { 844 sctp_chunk_output(stcb->sctp_ep, stcb, 845 SCTP_OUTPUT_FROM_COOKIE_ACK, 846 SCTP_SO_NOT_LOCKED); 847 } 848 } 849 850 851 static void 852 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 853 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 854 { 855 struct sctp_association *asoc; 856 int some_on_streamwheel; 857 858 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 859 struct socket *so; 860 861 #endif 862 863 SCTPDBG(SCTP_DEBUG_INPUT2, 864 "sctp_handle_shutdown: handling SHUTDOWN\n"); 865 if (stcb == NULL) 866 return; 867 asoc = &stcb->asoc; 868 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 869 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 870 return; 871 } 872 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 873 /* Shutdown NOT the expected size */ 874 return; 875 } else { 876 sctp_update_acked(stcb, cp, abort_flag); 877 if (*abort_flag) { 878 return; 879 } 880 } 881 if (asoc->control_pdapi) { 882 /* 883 * With a normal shutdown we assume the end of last record. 884 */ 885 SCTP_INP_READ_LOCK(stcb->sctp_ep); 886 asoc->control_pdapi->end_added = 1; 887 asoc->control_pdapi->pdapi_aborted = 1; 888 asoc->control_pdapi = NULL; 889 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 890 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 891 so = SCTP_INP_SO(stcb->sctp_ep); 892 atomic_add_int(&stcb->asoc.refcnt, 1); 893 SCTP_TCB_UNLOCK(stcb); 894 SCTP_SOCKET_LOCK(so, 1); 895 SCTP_TCB_LOCK(stcb); 896 atomic_subtract_int(&stcb->asoc.refcnt, 1); 897 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 898 /* assoc was freed while we were unlocked */ 899 SCTP_SOCKET_UNLOCK(so, 1); 900 return; 901 } 902 #endif 903 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 904 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 905 SCTP_SOCKET_UNLOCK(so, 1); 906 #endif 907 } 908 /* goto SHUTDOWN_RECEIVED state to block new requests */ 909 if (stcb->sctp_socket) { 910 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 911 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 912 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 913 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 914 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 915 /* 916 * notify upper layer that peer has initiated a 917 * shutdown 918 */ 919 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 920 921 /* reset time */ 922 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 923 } 924 } 925 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 926 /* 927 * stop the shutdown timer, since we WILL move to 928 * SHUTDOWN-ACK-SENT. 929 */ 930 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 931 } 932 /* Now is there unsent data on a stream somewhere? */ 933 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 934 935 if (!TAILQ_EMPTY(&asoc->send_queue) || 936 !TAILQ_EMPTY(&asoc->sent_queue) || 937 some_on_streamwheel) { 938 /* By returning we will push more data out */ 939 return; 940 } else { 941 /* no outstanding data to send, so move on... */ 942 /* send SHUTDOWN-ACK */ 943 sctp_send_shutdown_ack(stcb, net); 944 /* move to SHUTDOWN-ACK-SENT state */ 945 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 946 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 947 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 948 } 949 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 950 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 951 sctp_stop_timers_for_shutdown(stcb); 952 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 953 stcb, net); 954 } 955 } 956 957 static void 958 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 959 struct sctp_tcb *stcb, 960 struct sctp_nets *net) 961 { 962 struct sctp_association *asoc; 963 964 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 965 struct socket *so; 966 967 so = SCTP_INP_SO(stcb->sctp_ep); 968 #endif 969 SCTPDBG(SCTP_DEBUG_INPUT2, 970 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 971 if (stcb == NULL) 972 return; 973 974 asoc = &stcb->asoc; 975 /* process according to association state */ 976 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 977 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 978 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 979 sctp_send_shutdown_complete(stcb, net, 1); 980 SCTP_TCB_UNLOCK(stcb); 981 return; 982 } 983 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 984 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 985 /* unexpected SHUTDOWN-ACK... so ignore... */ 986 SCTP_TCB_UNLOCK(stcb); 987 return; 988 } 989 if (asoc->control_pdapi) { 990 /* 991 * With a normal shutdown we assume the end of last record. 992 */ 993 SCTP_INP_READ_LOCK(stcb->sctp_ep); 994 asoc->control_pdapi->end_added = 1; 995 asoc->control_pdapi->pdapi_aborted = 1; 996 asoc->control_pdapi = NULL; 997 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 999 atomic_add_int(&stcb->asoc.refcnt, 1); 1000 SCTP_TCB_UNLOCK(stcb); 1001 SCTP_SOCKET_LOCK(so, 1); 1002 SCTP_TCB_LOCK(stcb); 1003 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1004 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1005 /* assoc was freed while we were unlocked */ 1006 SCTP_SOCKET_UNLOCK(so, 1); 1007 return; 1008 } 1009 #endif 1010 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1011 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1012 SCTP_SOCKET_UNLOCK(so, 1); 1013 #endif 1014 } 1015 /* are the queues empty? */ 1016 if (!TAILQ_EMPTY(&asoc->send_queue) || 1017 !TAILQ_EMPTY(&asoc->sent_queue) || 1018 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1019 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 1020 } 1021 /* stop the timer */ 1022 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1023 /* send SHUTDOWN-COMPLETE */ 1024 sctp_send_shutdown_complete(stcb, net, 0); 1025 /* notify upper layer protocol */ 1026 if (stcb->sctp_socket) { 1027 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1028 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1029 stcb->sctp_socket->so_snd.sb_cc = 0; 1030 } 1031 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1032 } 1033 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1034 /* free the TCB but first save off the ep */ 1035 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1036 atomic_add_int(&stcb->asoc.refcnt, 1); 1037 SCTP_TCB_UNLOCK(stcb); 1038 SCTP_SOCKET_LOCK(so, 1); 1039 SCTP_TCB_LOCK(stcb); 1040 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1041 #endif 1042 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1043 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1044 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1045 SCTP_SOCKET_UNLOCK(so, 1); 1046 #endif 1047 } 1048 1049 /* 1050 * Skip past the param header and then we will find the chunk that caused the 1051 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1052 * our peer must be broken. 1053 */ 1054 static void 1055 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1056 struct sctp_nets *net) 1057 { 1058 struct sctp_chunkhdr *chk; 1059 1060 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1061 switch (chk->chunk_type) { 1062 case SCTP_ASCONF_ACK: 1063 case SCTP_ASCONF: 1064 sctp_asconf_cleanup(stcb, net); 1065 break; 1066 case SCTP_FORWARD_CUM_TSN: 1067 stcb->asoc.peer_supports_prsctp = 0; 1068 break; 1069 default: 1070 SCTPDBG(SCTP_DEBUG_INPUT2, 1071 "Peer does not support chunk type %d(%x)??\n", 1072 chk->chunk_type, (uint32_t) chk->chunk_type); 1073 break; 1074 } 1075 } 1076 1077 /* 1078 * Skip past the param header and then we will find the param that caused the 1079 * problem. There are a number of param's in a ASCONF OR the prsctp param 1080 * these will turn of specific features. 1081 */ 1082 static void 1083 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1084 { 1085 struct sctp_paramhdr *pbad; 1086 1087 pbad = phdr + 1; 1088 switch (ntohs(pbad->param_type)) { 1089 /* pr-sctp draft */ 1090 case SCTP_PRSCTP_SUPPORTED: 1091 stcb->asoc.peer_supports_prsctp = 0; 1092 break; 1093 case SCTP_SUPPORTED_CHUNK_EXT: 1094 break; 1095 /* draft-ietf-tsvwg-addip-sctp */ 1096 case SCTP_HAS_NAT_SUPPORT: 1097 stcb->asoc.peer_supports_nat = 0; 1098 break; 1099 case SCTP_ADD_IP_ADDRESS: 1100 case SCTP_DEL_IP_ADDRESS: 1101 case SCTP_SET_PRIM_ADDR: 1102 stcb->asoc.peer_supports_asconf = 0; 1103 break; 1104 case SCTP_SUCCESS_REPORT: 1105 case SCTP_ERROR_CAUSE_IND: 1106 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1107 SCTPDBG(SCTP_DEBUG_INPUT2, 1108 "Turning off ASCONF to this strange peer\n"); 1109 stcb->asoc.peer_supports_asconf = 0; 1110 break; 1111 default: 1112 SCTPDBG(SCTP_DEBUG_INPUT2, 1113 "Peer does not support param type %d(%x)??\n", 1114 pbad->param_type, (uint32_t) pbad->param_type); 1115 break; 1116 } 1117 } 1118 1119 static int 1120 sctp_handle_error(struct sctp_chunkhdr *ch, 1121 struct sctp_tcb *stcb, struct sctp_nets *net) 1122 { 1123 int chklen; 1124 struct sctp_paramhdr *phdr; 1125 uint16_t error_type; 1126 uint16_t error_len; 1127 struct sctp_association *asoc; 1128 int adjust; 1129 1130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1131 struct socket *so; 1132 1133 #endif 1134 1135 /* parse through all of the errors and process */ 1136 asoc = &stcb->asoc; 1137 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1138 sizeof(struct sctp_chunkhdr)); 1139 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1140 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1141 /* Process an Error Cause */ 1142 error_type = ntohs(phdr->param_type); 1143 error_len = ntohs(phdr->param_length); 1144 if ((error_len > chklen) || (error_len == 0)) { 1145 /* invalid param length for this param */ 1146 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1147 chklen, error_len); 1148 return (0); 1149 } 1150 switch (error_type) { 1151 case SCTP_CAUSE_INVALID_STREAM: 1152 case SCTP_CAUSE_MISSING_PARAM: 1153 case SCTP_CAUSE_INVALID_PARAM: 1154 case SCTP_CAUSE_NO_USER_DATA: 1155 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1156 error_type); 1157 break; 1158 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1159 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1160 ch->chunk_flags); 1161 if (sctp_handle_nat_colliding_state(stcb)) { 1162 return (0); 1163 } 1164 break; 1165 case SCTP_CAUSE_NAT_MISSING_STATE: 1166 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1167 ch->chunk_flags); 1168 if (sctp_handle_nat_missing_state(stcb, net)) { 1169 return (0); 1170 } 1171 break; 1172 case SCTP_CAUSE_STALE_COOKIE: 1173 /* 1174 * We only act if we have echoed a cookie and are 1175 * waiting. 1176 */ 1177 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1178 int *p; 1179 1180 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1181 /* Save the time doubled */ 1182 asoc->cookie_preserve_req = ntohl(*p) << 1; 1183 asoc->stale_cookie_count++; 1184 if (asoc->stale_cookie_count > 1185 asoc->max_init_times) { 1186 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1187 /* now free the asoc */ 1188 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1189 so = SCTP_INP_SO(stcb->sctp_ep); 1190 atomic_add_int(&stcb->asoc.refcnt, 1); 1191 SCTP_TCB_UNLOCK(stcb); 1192 SCTP_SOCKET_LOCK(so, 1); 1193 SCTP_TCB_LOCK(stcb); 1194 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1195 #endif 1196 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1197 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1198 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1199 SCTP_SOCKET_UNLOCK(so, 1); 1200 #endif 1201 return (-1); 1202 } 1203 /* blast back to INIT state */ 1204 sctp_toss_old_cookies(stcb, &stcb->asoc); 1205 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1206 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1207 sctp_stop_all_cookie_timers(stcb); 1208 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1209 } 1210 break; 1211 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1212 /* 1213 * Nothing we can do here, we don't do hostname 1214 * addresses so if the peer does not like my IPv6 1215 * (or IPv4 for that matter) it does not matter. If 1216 * they don't support that type of address, they can 1217 * NOT possibly get that packet type... i.e. with no 1218 * IPv6 you can't recieve a IPv6 packet. so we can 1219 * safely ignore this one. If we ever added support 1220 * for HOSTNAME Addresses, then we would need to do 1221 * something here. 1222 */ 1223 break; 1224 case SCTP_CAUSE_UNRECOG_CHUNK: 1225 sctp_process_unrecog_chunk(stcb, phdr, net); 1226 break; 1227 case SCTP_CAUSE_UNRECOG_PARAM: 1228 sctp_process_unrecog_param(stcb, phdr); 1229 break; 1230 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1231 /* 1232 * We ignore this since the timer will drive out a 1233 * new cookie anyway and there timer will drive us 1234 * to send a SHUTDOWN_COMPLETE. We can't send one 1235 * here since we don't have their tag. 1236 */ 1237 break; 1238 case SCTP_CAUSE_DELETING_LAST_ADDR: 1239 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1240 case SCTP_CAUSE_DELETING_SRC_ADDR: 1241 /* 1242 * We should NOT get these here, but in a 1243 * ASCONF-ACK. 1244 */ 1245 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1246 error_type); 1247 break; 1248 case SCTP_CAUSE_OUT_OF_RESC: 1249 /* 1250 * And what, pray tell do we do with the fact that 1251 * the peer is out of resources? Not really sure we 1252 * could do anything but abort. I suspect this 1253 * should have came WITH an abort instead of in a 1254 * OP-ERROR. 1255 */ 1256 break; 1257 default: 1258 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1259 error_type); 1260 break; 1261 } 1262 adjust = SCTP_SIZE32(error_len); 1263 chklen -= adjust; 1264 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1265 } 1266 return (0); 1267 } 1268 1269 static int 1270 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1271 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1272 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1273 { 1274 struct sctp_init_ack *init_ack; 1275 struct mbuf *op_err; 1276 1277 SCTPDBG(SCTP_DEBUG_INPUT2, 1278 "sctp_handle_init_ack: handling INIT-ACK\n"); 1279 1280 if (stcb == NULL) { 1281 SCTPDBG(SCTP_DEBUG_INPUT2, 1282 "sctp_handle_init_ack: TCB is null\n"); 1283 return (-1); 1284 } 1285 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1286 /* Invalid length */ 1287 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1288 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1289 op_err, 0, net->port); 1290 *abort_no_unlock = 1; 1291 return (-1); 1292 } 1293 init_ack = &cp->init; 1294 /* validate parameters */ 1295 if (init_ack->initiate_tag == 0) { 1296 /* protocol error... send an abort */ 1297 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1298 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1299 op_err, 0, net->port); 1300 *abort_no_unlock = 1; 1301 return (-1); 1302 } 1303 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1304 /* protocol error... send an abort */ 1305 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1306 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1307 op_err, 0, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 if (init_ack->num_inbound_streams == 0) { 1312 /* protocol error... send an abort */ 1313 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1314 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1315 op_err, 0, net->port); 1316 *abort_no_unlock = 1; 1317 return (-1); 1318 } 1319 if (init_ack->num_outbound_streams == 0) { 1320 /* protocol error... send an abort */ 1321 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1322 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1323 op_err, 0, net->port); 1324 *abort_no_unlock = 1; 1325 return (-1); 1326 } 1327 /* process according to association state... */ 1328 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1329 case SCTP_STATE_COOKIE_WAIT: 1330 /* this is the expected state for this chunk */ 1331 /* process the INIT-ACK parameters */ 1332 if (stcb->asoc.primary_destination->dest_state & 1333 SCTP_ADDR_UNCONFIRMED) { 1334 /* 1335 * The primary is where we sent the INIT, we can 1336 * always consider it confirmed when the INIT-ACK is 1337 * returned. Do this before we load addresses 1338 * though. 1339 */ 1340 stcb->asoc.primary_destination->dest_state &= 1341 ~SCTP_ADDR_UNCONFIRMED; 1342 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1343 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1344 } 1345 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1346 net, abort_no_unlock, vrf_id) < 0) { 1347 /* error in parsing parameters */ 1348 return (-1); 1349 } 1350 /* update our state */ 1351 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1352 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1353 1354 /* reset the RTO calc */ 1355 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1356 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1357 stcb->asoc.overall_error_count, 1358 0, 1359 SCTP_FROM_SCTP_INPUT, 1360 __LINE__); 1361 } 1362 stcb->asoc.overall_error_count = 0; 1363 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1364 /* 1365 * collapse the init timer back in case of a exponential 1366 * backoff 1367 */ 1368 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1369 stcb, net); 1370 /* 1371 * the send at the end of the inbound data processing will 1372 * cause the cookie to be sent 1373 */ 1374 break; 1375 case SCTP_STATE_SHUTDOWN_SENT: 1376 /* incorrect state... discard */ 1377 break; 1378 case SCTP_STATE_COOKIE_ECHOED: 1379 /* incorrect state... discard */ 1380 break; 1381 case SCTP_STATE_OPEN: 1382 /* incorrect state... discard */ 1383 break; 1384 case SCTP_STATE_EMPTY: 1385 case SCTP_STATE_INUSE: 1386 default: 1387 /* incorrect state... discard */ 1388 return (-1); 1389 break; 1390 } 1391 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1392 return (0); 1393 } 1394 1395 static struct sctp_tcb * 1396 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1397 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1398 struct sctp_inpcb *inp, struct sctp_nets **netp, 1399 struct sockaddr *init_src, int *notification, 1400 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1401 uint32_t vrf_id, uint16_t port); 1402 1403 1404 /* 1405 * handle a state cookie for an existing association m: input packet mbuf 1406 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1407 * "split" mbuf and the cookie signature does not exist offset: offset into 1408 * mbuf to the cookie-echo chunk 1409 */ 1410 static struct sctp_tcb * 1411 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1412 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1413 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1414 struct sockaddr *init_src, int *notification, 1415 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1416 { 1417 struct sctp_association *asoc; 1418 struct sctp_init_chunk *init_cp, init_buf; 1419 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1420 struct sctp_nets *net; 1421 struct mbuf *op_err; 1422 struct sctp_paramhdr *ph; 1423 int init_offset, initack_offset, i; 1424 int retval; 1425 int spec_flag = 0; 1426 uint32_t how_indx; 1427 1428 net = *netp; 1429 /* I know that the TCB is non-NULL from the caller */ 1430 asoc = &stcb->asoc; 1431 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1432 if (asoc->cookie_how[how_indx] == 0) 1433 break; 1434 } 1435 if (how_indx < sizeof(asoc->cookie_how)) { 1436 asoc->cookie_how[how_indx] = 1; 1437 } 1438 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1439 /* SHUTDOWN came in after sending INIT-ACK */ 1440 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1441 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1442 0, M_DONTWAIT, 1, MT_DATA); 1443 if (op_err == NULL) { 1444 /* FOOBAR */ 1445 return (NULL); 1446 } 1447 /* Set the len */ 1448 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1449 ph = mtod(op_err, struct sctp_paramhdr *); 1450 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1451 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1452 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1453 vrf_id, net->port); 1454 if (how_indx < sizeof(asoc->cookie_how)) 1455 asoc->cookie_how[how_indx] = 2; 1456 return (NULL); 1457 } 1458 /* 1459 * find and validate the INIT chunk in the cookie (peer's info) the 1460 * INIT should start after the cookie-echo header struct (chunk 1461 * header, state cookie header struct) 1462 */ 1463 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1464 1465 init_cp = (struct sctp_init_chunk *) 1466 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1467 (uint8_t *) & init_buf); 1468 if (init_cp == NULL) { 1469 /* could not pull a INIT chunk in cookie */ 1470 return (NULL); 1471 } 1472 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1473 return (NULL); 1474 } 1475 /* 1476 * find and validate the INIT-ACK chunk in the cookie (my info) the 1477 * INIT-ACK follows the INIT chunk 1478 */ 1479 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1480 initack_cp = (struct sctp_init_ack_chunk *) 1481 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1482 (uint8_t *) & initack_buf); 1483 if (initack_cp == NULL) { 1484 /* could not pull INIT-ACK chunk in cookie */ 1485 return (NULL); 1486 } 1487 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1488 return (NULL); 1489 } 1490 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1491 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1492 /* 1493 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1494 * to get into the OPEN state 1495 */ 1496 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1497 /*- 1498 * Opps, this means that we somehow generated two vtag's 1499 * the same. I.e. we did: 1500 * Us Peer 1501 * <---INIT(tag=a)------ 1502 * ----INIT-ACK(tag=t)--> 1503 * ----INIT(tag=t)------> *1 1504 * <---INIT-ACK(tag=a)--- 1505 * <----CE(tag=t)------------- *2 1506 * 1507 * At point *1 we should be generating a different 1508 * tag t'. Which means we would throw away the CE and send 1509 * ours instead. Basically this is case C (throw away side). 1510 */ 1511 if (how_indx < sizeof(asoc->cookie_how)) 1512 asoc->cookie_how[how_indx] = 17; 1513 return (NULL); 1514 1515 } 1516 switch SCTP_GET_STATE 1517 (asoc) { 1518 case SCTP_STATE_COOKIE_WAIT: 1519 case SCTP_STATE_COOKIE_ECHOED: 1520 /* 1521 * INIT was sent but got a COOKIE_ECHO with the 1522 * correct tags... just accept it...but we must 1523 * process the init so that we can make sure we have 1524 * the right seq no's. 1525 */ 1526 /* First we must process the INIT !! */ 1527 retval = sctp_process_init(init_cp, stcb); 1528 if (retval < 0) { 1529 if (how_indx < sizeof(asoc->cookie_how)) 1530 asoc->cookie_how[how_indx] = 3; 1531 return (NULL); 1532 } 1533 /* we have already processed the INIT so no problem */ 1534 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1535 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1536 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1537 /* update current state */ 1538 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1539 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1540 else 1541 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1542 1543 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1544 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1545 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1546 stcb->sctp_ep, stcb, asoc->primary_destination); 1547 } 1548 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1549 sctp_stop_all_cookie_timers(stcb); 1550 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1551 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1552 (inp->sctp_socket->so_qlimit == 0) 1553 ) { 1554 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1555 struct socket *so; 1556 1557 #endif 1558 /* 1559 * Here is where collision would go if we 1560 * did a connect() and instead got a 1561 * init/init-ack/cookie done before the 1562 * init-ack came back.. 1563 */ 1564 stcb->sctp_ep->sctp_flags |= 1565 SCTP_PCB_FLAGS_CONNECTED; 1566 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1567 so = SCTP_INP_SO(stcb->sctp_ep); 1568 atomic_add_int(&stcb->asoc.refcnt, 1); 1569 SCTP_TCB_UNLOCK(stcb); 1570 SCTP_SOCKET_LOCK(so, 1); 1571 SCTP_TCB_LOCK(stcb); 1572 atomic_add_int(&stcb->asoc.refcnt, -1); 1573 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1574 SCTP_SOCKET_UNLOCK(so, 1); 1575 return (NULL); 1576 } 1577 #endif 1578 soisconnected(stcb->sctp_socket); 1579 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1580 SCTP_SOCKET_UNLOCK(so, 1); 1581 #endif 1582 } 1583 /* notify upper layer */ 1584 *notification = SCTP_NOTIFY_ASSOC_UP; 1585 /* 1586 * since we did not send a HB make sure we don't 1587 * double things 1588 */ 1589 net->hb_responded = 1; 1590 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1591 &cookie->time_entered, 1592 sctp_align_unsafe_makecopy, 1593 SCTP_RTT_FROM_NON_DATA); 1594 1595 if (stcb->asoc.sctp_autoclose_ticks && 1596 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1597 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1598 inp, stcb, NULL); 1599 } 1600 break; 1601 default: 1602 /* 1603 * we're in the OPEN state (or beyond), so peer must 1604 * have simply lost the COOKIE-ACK 1605 */ 1606 break; 1607 } /* end switch */ 1608 sctp_stop_all_cookie_timers(stcb); 1609 /* 1610 * We ignore the return code here.. not sure if we should 1611 * somehow abort.. but we do have an existing asoc. This 1612 * really should not fail. 1613 */ 1614 if (sctp_load_addresses_from_init(stcb, m, 1615 init_offset + sizeof(struct sctp_init_chunk), 1616 initack_offset, sh, init_src)) { 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 4; 1619 return (NULL); 1620 } 1621 /* respond with a COOKIE-ACK */ 1622 sctp_toss_old_cookies(stcb, asoc); 1623 sctp_send_cookie_ack(stcb); 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 5; 1626 return (stcb); 1627 } 1628 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1629 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1630 cookie->tie_tag_my_vtag == 0 && 1631 cookie->tie_tag_peer_vtag == 0) { 1632 /* 1633 * case C in Section 5.2.4 Table 2: XMOO silently discard 1634 */ 1635 if (how_indx < sizeof(asoc->cookie_how)) 1636 asoc->cookie_how[how_indx] = 6; 1637 return (NULL); 1638 } 1639 /* 1640 * If nat support, and the below and stcb is established, send back 1641 * a ABORT(colliding state) if we are established. 1642 */ 1643 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1644 (asoc->peer_supports_nat) && 1645 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1646 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1647 (asoc->peer_vtag == 0)))) { 1648 /* 1649 * Special case - Peer's support nat. We may have two init's 1650 * that we gave out the same tag on since one was not 1651 * established.. i.e. we get INIT from host-1 behind the nat 1652 * and we respond tag-a, we get a INIT from host-2 behind 1653 * the nat and we get tag-a again. Then we bring up host-1 1654 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1655 * Now we have colliding state. We must send an abort here 1656 * with colliding state indication. 1657 */ 1658 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1659 0, M_DONTWAIT, 1, MT_DATA); 1660 if (op_err == NULL) { 1661 /* FOOBAR */ 1662 return (NULL); 1663 } 1664 /* pre-reserve some space */ 1665 #ifdef INET6 1666 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1667 #else 1668 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1669 #endif 1670 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1671 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1672 /* Set the len */ 1673 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1674 ph = mtod(op_err, struct sctp_paramhdr *); 1675 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1676 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1677 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1678 return (NULL); 1679 } 1680 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1681 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1682 (asoc->peer_vtag == 0))) { 1683 /* 1684 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1685 * should be ok, re-accept peer info 1686 */ 1687 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1688 /* 1689 * Extension of case C. If we hit this, then the 1690 * random number generator returned the same vtag 1691 * when we first sent our INIT-ACK and when we later 1692 * sent our INIT. The side with the seq numbers that 1693 * are different will be the one that normnally 1694 * would have hit case C. This in effect "extends" 1695 * our vtags in this collision case to be 64 bits. 1696 * The same collision could occur aka you get both 1697 * vtag and seq number the same twice in a row.. but 1698 * is much less likely. If it did happen then we 1699 * would proceed through and bring up the assoc.. we 1700 * may end up with the wrong stream setup however.. 1701 * which would be bad.. but there is no way to 1702 * tell.. until we send on a stream that does not 1703 * exist :-) 1704 */ 1705 if (how_indx < sizeof(asoc->cookie_how)) 1706 asoc->cookie_how[how_indx] = 7; 1707 1708 return (NULL); 1709 } 1710 if (how_indx < sizeof(asoc->cookie_how)) 1711 asoc->cookie_how[how_indx] = 8; 1712 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1713 sctp_stop_all_cookie_timers(stcb); 1714 /* 1715 * since we did not send a HB make sure we don't double 1716 * things 1717 */ 1718 net->hb_responded = 1; 1719 if (stcb->asoc.sctp_autoclose_ticks && 1720 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1721 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1722 NULL); 1723 } 1724 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1725 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1726 1727 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1728 /* 1729 * Ok the peer probably discarded our data (if we 1730 * echoed a cookie+data). So anything on the 1731 * sent_queue should be marked for retransmit, we 1732 * may not get something to kick us so it COULD 1733 * still take a timeout to move these.. but it can't 1734 * hurt to mark them. 1735 */ 1736 struct sctp_tmit_chunk *chk; 1737 1738 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1739 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1740 chk->sent = SCTP_DATAGRAM_RESEND; 1741 sctp_flight_size_decrease(chk); 1742 sctp_total_flight_decrease(stcb, chk); 1743 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1744 spec_flag++; 1745 } 1746 } 1747 1748 } 1749 /* process the INIT info (peer's info) */ 1750 retval = sctp_process_init(init_cp, stcb); 1751 if (retval < 0) { 1752 if (how_indx < sizeof(asoc->cookie_how)) 1753 asoc->cookie_how[how_indx] = 9; 1754 return (NULL); 1755 } 1756 if (sctp_load_addresses_from_init(stcb, m, 1757 init_offset + sizeof(struct sctp_init_chunk), 1758 initack_offset, sh, init_src)) { 1759 if (how_indx < sizeof(asoc->cookie_how)) 1760 asoc->cookie_how[how_indx] = 10; 1761 return (NULL); 1762 } 1763 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1764 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1765 *notification = SCTP_NOTIFY_ASSOC_UP; 1766 1767 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1768 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1769 (inp->sctp_socket->so_qlimit == 0)) { 1770 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1771 struct socket *so; 1772 1773 #endif 1774 stcb->sctp_ep->sctp_flags |= 1775 SCTP_PCB_FLAGS_CONNECTED; 1776 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1777 so = SCTP_INP_SO(stcb->sctp_ep); 1778 atomic_add_int(&stcb->asoc.refcnt, 1); 1779 SCTP_TCB_UNLOCK(stcb); 1780 SCTP_SOCKET_LOCK(so, 1); 1781 SCTP_TCB_LOCK(stcb); 1782 atomic_add_int(&stcb->asoc.refcnt, -1); 1783 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1784 SCTP_SOCKET_UNLOCK(so, 1); 1785 return (NULL); 1786 } 1787 #endif 1788 soisconnected(stcb->sctp_socket); 1789 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1790 SCTP_SOCKET_UNLOCK(so, 1); 1791 #endif 1792 } 1793 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1794 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1795 else 1796 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1797 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1798 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1799 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1800 } else { 1801 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1802 } 1803 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1804 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1805 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1806 stcb->sctp_ep, stcb, asoc->primary_destination); 1807 } 1808 sctp_stop_all_cookie_timers(stcb); 1809 sctp_toss_old_cookies(stcb, asoc); 1810 sctp_send_cookie_ack(stcb); 1811 if (spec_flag) { 1812 /* 1813 * only if we have retrans set do we do this. What 1814 * this call does is get only the COOKIE-ACK out and 1815 * then when we return the normal call to 1816 * sctp_chunk_output will get the retrans out behind 1817 * this. 1818 */ 1819 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1820 } 1821 if (how_indx < sizeof(asoc->cookie_how)) 1822 asoc->cookie_how[how_indx] = 11; 1823 1824 return (stcb); 1825 } 1826 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1827 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1828 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1829 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1830 cookie->tie_tag_peer_vtag != 0) { 1831 struct sctpasochead *head; 1832 1833 if (asoc->peer_supports_nat) { 1834 /* 1835 * This is a gross gross hack. just call the 1836 * cookie_new code since we are allowing a duplicate 1837 * association. I hope this works... 1838 */ 1839 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1840 inp, netp, init_src, notification, 1841 auth_skipped, auth_offset, auth_len, 1842 vrf_id, port)); 1843 } 1844 /* 1845 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1846 */ 1847 /* temp code */ 1848 if (how_indx < sizeof(asoc->cookie_how)) 1849 asoc->cookie_how[how_indx] = 12; 1850 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1851 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1852 1853 /* notify upper layer */ 1854 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1855 atomic_add_int(&stcb->asoc.refcnt, 1); 1856 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1857 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1858 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1859 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1860 } 1861 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1862 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1863 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1864 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1865 } 1866 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1867 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1868 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1869 stcb->sctp_ep, stcb, asoc->primary_destination); 1870 1871 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1872 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1873 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1874 } 1875 asoc->pre_open_streams = 1876 ntohs(initack_cp->init.num_outbound_streams); 1877 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1878 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1879 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1880 1881 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1882 1883 asoc->str_reset_seq_in = asoc->init_seq_number; 1884 1885 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1886 if (asoc->mapping_array) { 1887 memset(asoc->mapping_array, 0, 1888 asoc->mapping_array_size); 1889 } 1890 if (asoc->nr_mapping_array) { 1891 memset(asoc->nr_mapping_array, 0, 1892 asoc->mapping_array_size); 1893 } 1894 SCTP_TCB_UNLOCK(stcb); 1895 SCTP_INP_INFO_WLOCK(); 1896 SCTP_INP_WLOCK(stcb->sctp_ep); 1897 SCTP_TCB_LOCK(stcb); 1898 atomic_add_int(&stcb->asoc.refcnt, -1); 1899 /* send up all the data */ 1900 SCTP_TCB_SEND_LOCK(stcb); 1901 1902 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1903 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1904 stcb->asoc.strmout[i].stream_no = i; 1905 stcb->asoc.strmout[i].next_sequence_sent = 0; 1906 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1907 } 1908 /* process the INIT-ACK info (my info) */ 1909 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1910 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1911 1912 /* pull from vtag hash */ 1913 LIST_REMOVE(stcb, sctp_asocs); 1914 /* re-insert to new vtag position */ 1915 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1916 SCTP_BASE_INFO(hashasocmark))]; 1917 /* 1918 * put it in the bucket in the vtag hash of assoc's for the 1919 * system 1920 */ 1921 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1922 1923 /* process the INIT info (peer's info) */ 1924 SCTP_TCB_SEND_UNLOCK(stcb); 1925 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1926 SCTP_INP_INFO_WUNLOCK(); 1927 1928 retval = sctp_process_init(init_cp, stcb); 1929 if (retval < 0) { 1930 if (how_indx < sizeof(asoc->cookie_how)) 1931 asoc->cookie_how[how_indx] = 13; 1932 1933 return (NULL); 1934 } 1935 /* 1936 * since we did not send a HB make sure we don't double 1937 * things 1938 */ 1939 net->hb_responded = 1; 1940 1941 if (sctp_load_addresses_from_init(stcb, m, 1942 init_offset + sizeof(struct sctp_init_chunk), 1943 initack_offset, sh, init_src)) { 1944 if (how_indx < sizeof(asoc->cookie_how)) 1945 asoc->cookie_how[how_indx] = 14; 1946 1947 return (NULL); 1948 } 1949 /* respond with a COOKIE-ACK */ 1950 sctp_stop_all_cookie_timers(stcb); 1951 sctp_toss_old_cookies(stcb, asoc); 1952 sctp_send_cookie_ack(stcb); 1953 if (how_indx < sizeof(asoc->cookie_how)) 1954 asoc->cookie_how[how_indx] = 15; 1955 1956 return (stcb); 1957 } 1958 if (how_indx < sizeof(asoc->cookie_how)) 1959 asoc->cookie_how[how_indx] = 16; 1960 /* all other cases... */ 1961 return (NULL); 1962 } 1963 1964 1965 /* 1966 * handle a state cookie for a new association m: input packet mbuf chain-- 1967 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1968 * and the cookie signature does not exist offset: offset into mbuf to the 1969 * cookie-echo chunk length: length of the cookie chunk to: where the init 1970 * was from returns a new TCB 1971 */ 1972 struct sctp_tcb * 1973 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1974 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1975 struct sctp_inpcb *inp, struct sctp_nets **netp, 1976 struct sockaddr *init_src, int *notification, 1977 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1978 uint32_t vrf_id, uint16_t port) 1979 { 1980 struct sctp_tcb *stcb; 1981 struct sctp_init_chunk *init_cp, init_buf; 1982 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1983 struct sockaddr_storage sa_store; 1984 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1985 struct sctp_association *asoc; 1986 int init_offset, initack_offset, initack_limit; 1987 int retval; 1988 int error = 0; 1989 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1990 1991 #ifdef INET 1992 struct sockaddr_in *sin; 1993 1994 #endif 1995 #ifdef INET6 1996 struct sockaddr_in6 *sin6; 1997 1998 #endif 1999 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2000 struct socket *so; 2001 2002 so = SCTP_INP_SO(inp); 2003 #endif 2004 2005 /* 2006 * find and validate the INIT chunk in the cookie (peer's info) the 2007 * INIT should start after the cookie-echo header struct (chunk 2008 * header, state cookie header struct) 2009 */ 2010 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2011 init_cp = (struct sctp_init_chunk *) 2012 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2013 (uint8_t *) & init_buf); 2014 if (init_cp == NULL) { 2015 /* could not pull a INIT chunk in cookie */ 2016 SCTPDBG(SCTP_DEBUG_INPUT1, 2017 "process_cookie_new: could not pull INIT chunk hdr\n"); 2018 return (NULL); 2019 } 2020 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2021 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2022 return (NULL); 2023 } 2024 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2025 /* 2026 * find and validate the INIT-ACK chunk in the cookie (my info) the 2027 * INIT-ACK follows the INIT chunk 2028 */ 2029 initack_cp = (struct sctp_init_ack_chunk *) 2030 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2031 (uint8_t *) & initack_buf); 2032 if (initack_cp == NULL) { 2033 /* could not pull INIT-ACK chunk in cookie */ 2034 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2035 return (NULL); 2036 } 2037 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2038 return (NULL); 2039 } 2040 /* 2041 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2042 * "initack_limit" value. This is because the chk_length field 2043 * includes the length of the cookie, but the cookie is omitted when 2044 * the INIT and INIT_ACK are tacked onto the cookie... 2045 */ 2046 initack_limit = offset + cookie_len; 2047 2048 /* 2049 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2050 * and popluate 2051 */ 2052 2053 /* 2054 * Here we do a trick, we set in NULL for the proc/thread argument. 2055 * We do this since in effect we only use the p argument when the 2056 * socket is unbound and we must do an implicit bind. Since we are 2057 * getting a cookie, we cannot be unbound. 2058 */ 2059 stcb = sctp_aloc_assoc(inp, init_src, &error, 2060 ntohl(initack_cp->init.initiate_tag), vrf_id, 2061 (struct thread *)NULL 2062 ); 2063 if (stcb == NULL) { 2064 struct mbuf *op_err; 2065 2066 /* memory problem? */ 2067 SCTPDBG(SCTP_DEBUG_INPUT1, 2068 "process_cookie_new: no room for another TCB!\n"); 2069 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2070 2071 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2072 sh, op_err, vrf_id, port); 2073 return (NULL); 2074 } 2075 /* get the correct sctp_nets */ 2076 if (netp) 2077 *netp = sctp_findnet(stcb, init_src); 2078 2079 asoc = &stcb->asoc; 2080 /* get scope variables out of cookie */ 2081 asoc->ipv4_local_scope = cookie->ipv4_scope; 2082 asoc->site_scope = cookie->site_scope; 2083 asoc->local_scope = cookie->local_scope; 2084 asoc->loopback_scope = cookie->loopback_scope; 2085 2086 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2087 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2088 struct mbuf *op_err; 2089 2090 /* 2091 * Houston we have a problem. The EP changed while the 2092 * cookie was in flight. Only recourse is to abort the 2093 * association. 2094 */ 2095 atomic_add_int(&stcb->asoc.refcnt, 1); 2096 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2097 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2098 sh, op_err, vrf_id, port); 2099 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2100 SCTP_TCB_UNLOCK(stcb); 2101 SCTP_SOCKET_LOCK(so, 1); 2102 SCTP_TCB_LOCK(stcb); 2103 #endif 2104 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2105 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2106 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2107 SCTP_SOCKET_UNLOCK(so, 1); 2108 #endif 2109 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2110 return (NULL); 2111 } 2112 /* process the INIT-ACK info (my info) */ 2113 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2114 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2115 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2116 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2117 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2118 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2119 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2120 asoc->str_reset_seq_in = asoc->init_seq_number; 2121 2122 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2123 2124 /* process the INIT info (peer's info) */ 2125 if (netp) 2126 retval = sctp_process_init(init_cp, stcb); 2127 else 2128 retval = 0; 2129 if (retval < 0) { 2130 atomic_add_int(&stcb->asoc.refcnt, 1); 2131 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135 #endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2137 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2138 SCTP_SOCKET_UNLOCK(so, 1); 2139 #endif 2140 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2141 return (NULL); 2142 } 2143 /* load all addresses */ 2144 if (sctp_load_addresses_from_init(stcb, m, 2145 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2146 init_src)) { 2147 atomic_add_int(&stcb->asoc.refcnt, 1); 2148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2149 SCTP_TCB_UNLOCK(stcb); 2150 SCTP_SOCKET_LOCK(so, 1); 2151 SCTP_TCB_LOCK(stcb); 2152 #endif 2153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2154 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2155 SCTP_SOCKET_UNLOCK(so, 1); 2156 #endif 2157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2158 return (NULL); 2159 } 2160 /* 2161 * verify any preceding AUTH chunk that was skipped 2162 */ 2163 /* pull the local authentication parameters from the cookie/init-ack */ 2164 sctp_auth_get_cookie_params(stcb, m, 2165 initack_offset + sizeof(struct sctp_init_ack_chunk), 2166 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2167 if (auth_skipped) { 2168 struct sctp_auth_chunk *auth; 2169 2170 auth = (struct sctp_auth_chunk *) 2171 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2172 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2173 /* auth HMAC failed, dump the assoc and packet */ 2174 SCTPDBG(SCTP_DEBUG_AUTH1, 2175 "COOKIE-ECHO: AUTH failed\n"); 2176 atomic_add_int(&stcb->asoc.refcnt, 1); 2177 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2178 SCTP_TCB_UNLOCK(stcb); 2179 SCTP_SOCKET_LOCK(so, 1); 2180 SCTP_TCB_LOCK(stcb); 2181 #endif 2182 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2183 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2184 SCTP_SOCKET_UNLOCK(so, 1); 2185 #endif 2186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2187 return (NULL); 2188 } else { 2189 /* remaining chunks checked... good to go */ 2190 stcb->asoc.authenticated = 1; 2191 } 2192 } 2193 /* update current state */ 2194 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2195 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2196 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2197 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2198 stcb->sctp_ep, stcb, asoc->primary_destination); 2199 } 2200 sctp_stop_all_cookie_timers(stcb); 2201 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2202 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2203 2204 /* 2205 * if we're doing ASCONFs, check to see if we have any new local 2206 * addresses that need to get added to the peer (eg. addresses 2207 * changed while cookie echo in flight). This needs to be done 2208 * after we go to the OPEN state to do the correct asconf 2209 * processing. else, make sure we have the correct addresses in our 2210 * lists 2211 */ 2212 2213 /* warning, we re-use sin, sin6, sa_store here! */ 2214 /* pull in local_address (our "from" address) */ 2215 switch (cookie->laddr_type) { 2216 #ifdef INET 2217 case SCTP_IPV4_ADDRESS: 2218 /* source addr is IPv4 */ 2219 sin = (struct sockaddr_in *)initack_src; 2220 memset(sin, 0, sizeof(*sin)); 2221 sin->sin_family = AF_INET; 2222 sin->sin_len = sizeof(struct sockaddr_in); 2223 sin->sin_addr.s_addr = cookie->laddress[0]; 2224 break; 2225 #endif 2226 #ifdef INET6 2227 case SCTP_IPV6_ADDRESS: 2228 /* source addr is IPv6 */ 2229 sin6 = (struct sockaddr_in6 *)initack_src; 2230 memset(sin6, 0, sizeof(*sin6)); 2231 sin6->sin6_family = AF_INET6; 2232 sin6->sin6_len = sizeof(struct sockaddr_in6); 2233 sin6->sin6_scope_id = cookie->scope_id; 2234 memcpy(&sin6->sin6_addr, cookie->laddress, 2235 sizeof(sin6->sin6_addr)); 2236 break; 2237 #endif 2238 default: 2239 atomic_add_int(&stcb->asoc.refcnt, 1); 2240 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2241 SCTP_TCB_UNLOCK(stcb); 2242 SCTP_SOCKET_LOCK(so, 1); 2243 SCTP_TCB_LOCK(stcb); 2244 #endif 2245 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2246 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2247 SCTP_SOCKET_UNLOCK(so, 1); 2248 #endif 2249 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2250 return (NULL); 2251 } 2252 2253 /* set up to notify upper layer */ 2254 *notification = SCTP_NOTIFY_ASSOC_UP; 2255 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2256 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2257 (inp->sctp_socket->so_qlimit == 0)) { 2258 /* 2259 * This is an endpoint that called connect() how it got a 2260 * cookie that is NEW is a bit of a mystery. It must be that 2261 * the INIT was sent, but before it got there.. a complete 2262 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2263 * should have went to the other code.. not here.. oh well.. 2264 * a bit of protection is worth having.. 2265 */ 2266 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2267 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269 SCTP_TCB_UNLOCK(stcb); 2270 SCTP_SOCKET_LOCK(so, 1); 2271 SCTP_TCB_LOCK(stcb); 2272 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2273 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2274 SCTP_SOCKET_UNLOCK(so, 1); 2275 return (NULL); 2276 } 2277 #endif 2278 soisconnected(stcb->sctp_socket); 2279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2280 SCTP_SOCKET_UNLOCK(so, 1); 2281 #endif 2282 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2283 (inp->sctp_socket->so_qlimit)) { 2284 /* 2285 * We don't want to do anything with this one. Since it is 2286 * the listening guy. The timer will get started for 2287 * accepted connections in the caller. 2288 */ 2289 ; 2290 } 2291 /* since we did not send a HB make sure we don't double things */ 2292 if ((netp) && (*netp)) 2293 (*netp)->hb_responded = 1; 2294 2295 if (stcb->asoc.sctp_autoclose_ticks && 2296 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2297 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2298 } 2299 /* calculate the RTT */ 2300 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2301 if ((netp) && (*netp)) { 2302 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2303 &cookie->time_entered, sctp_align_unsafe_makecopy, 2304 SCTP_RTT_FROM_NON_DATA); 2305 } 2306 /* respond with a COOKIE-ACK */ 2307 sctp_send_cookie_ack(stcb); 2308 2309 /* 2310 * check the address lists for any ASCONFs that need to be sent 2311 * AFTER the cookie-ack is sent 2312 */ 2313 sctp_check_address_list(stcb, m, 2314 initack_offset + sizeof(struct sctp_init_ack_chunk), 2315 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2316 initack_src, cookie->local_scope, cookie->site_scope, 2317 cookie->ipv4_scope, cookie->loopback_scope); 2318 2319 2320 return (stcb); 2321 } 2322 2323 /* 2324 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2325 * we NEED to make sure we are not already using the vtag. If so we 2326 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2327 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2328 SCTP_BASE_INFO(hashasocmark))]; 2329 LIST_FOREACH(stcb, head, sctp_asocs) { 2330 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2331 -- SEND ABORT - TRY AGAIN -- 2332 } 2333 } 2334 */ 2335 2336 /* 2337 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2338 * existing (non-NULL) TCB 2339 */ 2340 static struct mbuf * 2341 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2342 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2343 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2344 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2345 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2346 { 2347 struct sctp_state_cookie *cookie; 2348 struct sctp_tcb *l_stcb = *stcb; 2349 struct sctp_inpcb *l_inp; 2350 struct sockaddr *to; 2351 struct sctp_pcb *ep; 2352 struct mbuf *m_sig; 2353 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2354 uint8_t *sig; 2355 uint8_t cookie_ok = 0; 2356 unsigned int size_of_pkt, sig_offset, cookie_offset; 2357 unsigned int cookie_len; 2358 struct timeval now; 2359 struct timeval time_expires; 2360 struct sockaddr_storage dest_store; 2361 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2362 struct ip *iph; 2363 int notification = 0; 2364 struct sctp_nets *netl; 2365 int had_a_existing_tcb = 0; 2366 int send_int_conf = 0; 2367 2368 #ifdef INET 2369 struct sockaddr_in sin; 2370 2371 #endif 2372 #ifdef INET6 2373 struct sockaddr_in6 sin6; 2374 2375 #endif 2376 2377 SCTPDBG(SCTP_DEBUG_INPUT2, 2378 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2379 2380 if (inp_p == NULL) { 2381 return (NULL); 2382 } 2383 /* First get the destination address setup too. */ 2384 iph = mtod(m, struct ip *); 2385 switch (iph->ip_v) { 2386 #ifdef INET 2387 case IPVERSION: 2388 { 2389 /* its IPv4 */ 2390 struct sockaddr_in *lsin; 2391 2392 lsin = (struct sockaddr_in *)(localep_sa); 2393 memset(lsin, 0, sizeof(*lsin)); 2394 lsin->sin_family = AF_INET; 2395 lsin->sin_len = sizeof(*lsin); 2396 lsin->sin_port = sh->dest_port; 2397 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2398 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2399 break; 2400 } 2401 #endif 2402 #ifdef INET6 2403 case IPV6_VERSION >> 4: 2404 { 2405 /* its IPv6 */ 2406 struct ip6_hdr *ip6; 2407 struct sockaddr_in6 *lsin6; 2408 2409 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2410 memset(lsin6, 0, sizeof(*lsin6)); 2411 lsin6->sin6_family = AF_INET6; 2412 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2413 ip6 = mtod(m, struct ip6_hdr *); 2414 lsin6->sin6_port = sh->dest_port; 2415 lsin6->sin6_addr = ip6->ip6_dst; 2416 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2417 break; 2418 } 2419 #endif 2420 default: 2421 return (NULL); 2422 } 2423 2424 cookie = &cp->cookie; 2425 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2426 cookie_len = ntohs(cp->ch.chunk_length); 2427 2428 if ((cookie->peerport != sh->src_port) && 2429 (cookie->myport != sh->dest_port) && 2430 (cookie->my_vtag != sh->v_tag)) { 2431 /* 2432 * invalid ports or bad tag. Note that we always leave the 2433 * v_tag in the header in network order and when we stored 2434 * it in the my_vtag slot we also left it in network order. 2435 * This maintains the match even though it may be in the 2436 * opposite byte order of the machine :-> 2437 */ 2438 return (NULL); 2439 } 2440 if (cookie_len > size_of_pkt || 2441 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2442 sizeof(struct sctp_init_chunk) + 2443 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2444 /* cookie too long! or too small */ 2445 return (NULL); 2446 } 2447 /* 2448 * split off the signature into its own mbuf (since it should not be 2449 * calculated in the sctp_hmac_m() call). 2450 */ 2451 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2452 if (sig_offset > size_of_pkt) { 2453 /* packet not correct size! */ 2454 /* XXX this may already be accounted for earlier... */ 2455 return (NULL); 2456 } 2457 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2458 if (m_sig == NULL) { 2459 /* out of memory or ?? */ 2460 return (NULL); 2461 } 2462 #ifdef SCTP_MBUF_LOGGING 2463 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2464 struct mbuf *mat; 2465 2466 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2467 if (SCTP_BUF_IS_EXTENDED(mat)) { 2468 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2469 } 2470 } 2471 } 2472 #endif 2473 2474 /* 2475 * compute the signature/digest for the cookie 2476 */ 2477 ep = &(*inp_p)->sctp_ep; 2478 l_inp = *inp_p; 2479 if (l_stcb) { 2480 SCTP_TCB_UNLOCK(l_stcb); 2481 } 2482 SCTP_INP_RLOCK(l_inp); 2483 if (l_stcb) { 2484 SCTP_TCB_LOCK(l_stcb); 2485 } 2486 /* which cookie is it? */ 2487 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2488 (ep->current_secret_number != ep->last_secret_number)) { 2489 /* it's the old cookie */ 2490 (void)sctp_hmac_m(SCTP_HMAC, 2491 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2492 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2493 } else { 2494 /* it's the current cookie */ 2495 (void)sctp_hmac_m(SCTP_HMAC, 2496 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2497 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2498 } 2499 /* get the signature */ 2500 SCTP_INP_RUNLOCK(l_inp); 2501 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2502 if (sig == NULL) { 2503 /* couldn't find signature */ 2504 sctp_m_freem(m_sig); 2505 return (NULL); 2506 } 2507 /* compare the received digest with the computed digest */ 2508 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2509 /* try the old cookie? */ 2510 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2511 (ep->current_secret_number != ep->last_secret_number)) { 2512 /* compute digest with old */ 2513 (void)sctp_hmac_m(SCTP_HMAC, 2514 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2515 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2516 /* compare */ 2517 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2518 cookie_ok = 1; 2519 } 2520 } else { 2521 cookie_ok = 1; 2522 } 2523 2524 /* 2525 * Now before we continue we must reconstruct our mbuf so that 2526 * normal processing of any other chunks will work. 2527 */ 2528 { 2529 struct mbuf *m_at; 2530 2531 m_at = m; 2532 while (SCTP_BUF_NEXT(m_at) != NULL) { 2533 m_at = SCTP_BUF_NEXT(m_at); 2534 } 2535 SCTP_BUF_NEXT(m_at) = m_sig; 2536 } 2537 2538 if (cookie_ok == 0) { 2539 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2540 SCTPDBG(SCTP_DEBUG_INPUT2, 2541 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2542 (uint32_t) offset, cookie_offset, sig_offset); 2543 return (NULL); 2544 } 2545 /* 2546 * check the cookie timestamps to be sure it's not stale 2547 */ 2548 (void)SCTP_GETTIME_TIMEVAL(&now); 2549 /* Expire time is in Ticks, so we convert to seconds */ 2550 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2551 time_expires.tv_usec = cookie->time_entered.tv_usec; 2552 /* 2553 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2554 * is undefined. 2555 */ 2556 if (timevalcmp(&now, &time_expires, >)) { 2557 /* cookie is stale! */ 2558 struct mbuf *op_err; 2559 struct sctp_stale_cookie_msg *scm; 2560 uint32_t tim; 2561 2562 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2563 0, M_DONTWAIT, 1, MT_DATA); 2564 if (op_err == NULL) { 2565 /* FOOBAR */ 2566 return (NULL); 2567 } 2568 /* Set the len */ 2569 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2570 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2571 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2572 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2573 (sizeof(uint32_t)))); 2574 /* seconds to usec */ 2575 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2576 /* add in usec */ 2577 if (tim == 0) 2578 tim = now.tv_usec - cookie->time_entered.tv_usec; 2579 scm->time_usec = htonl(tim); 2580 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2581 vrf_id, port); 2582 return (NULL); 2583 } 2584 /* 2585 * Now we must see with the lookup address if we have an existing 2586 * asoc. This will only happen if we were in the COOKIE-WAIT state 2587 * and a INIT collided with us and somewhere the peer sent the 2588 * cookie on another address besides the single address our assoc 2589 * had for him. In this case we will have one of the tie-tags set at 2590 * least AND the address field in the cookie can be used to look it 2591 * up. 2592 */ 2593 to = NULL; 2594 switch (cookie->addr_type) { 2595 #ifdef INET6 2596 case SCTP_IPV6_ADDRESS: 2597 memset(&sin6, 0, sizeof(sin6)); 2598 sin6.sin6_family = AF_INET6; 2599 sin6.sin6_len = sizeof(sin6); 2600 sin6.sin6_port = sh->src_port; 2601 sin6.sin6_scope_id = cookie->scope_id; 2602 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2603 sizeof(sin6.sin6_addr.s6_addr)); 2604 to = (struct sockaddr *)&sin6; 2605 break; 2606 #endif 2607 #ifdef INET 2608 case SCTP_IPV4_ADDRESS: 2609 memset(&sin, 0, sizeof(sin)); 2610 sin.sin_family = AF_INET; 2611 sin.sin_len = sizeof(sin); 2612 sin.sin_port = sh->src_port; 2613 sin.sin_addr.s_addr = cookie->address[0]; 2614 to = (struct sockaddr *)&sin; 2615 break; 2616 #endif 2617 default: 2618 /* This should not happen */ 2619 return (NULL); 2620 } 2621 if ((*stcb == NULL) && to) { 2622 /* Yep, lets check */ 2623 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2624 if (*stcb == NULL) { 2625 /* 2626 * We should have only got back the same inp. If we 2627 * got back a different ep we have a problem. The 2628 * original findep got back l_inp and now 2629 */ 2630 if (l_inp != *inp_p) { 2631 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2632 } 2633 } else { 2634 if (*locked_tcb == NULL) { 2635 /* 2636 * In this case we found the assoc only 2637 * after we locked the create lock. This 2638 * means we are in a colliding case and we 2639 * must make sure that we unlock the tcb if 2640 * its one of the cases where we throw away 2641 * the incoming packets. 2642 */ 2643 *locked_tcb = *stcb; 2644 2645 /* 2646 * We must also increment the inp ref count 2647 * since the ref_count flags was set when we 2648 * did not find the TCB, now we found it 2649 * which reduces the refcount.. we must 2650 * raise it back out to balance it all :-) 2651 */ 2652 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2653 if ((*stcb)->sctp_ep != l_inp) { 2654 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2655 (*stcb)->sctp_ep, l_inp); 2656 } 2657 } 2658 } 2659 } 2660 if (to == NULL) { 2661 return (NULL); 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2667 cookie_len, *inp_p, netp, to, ¬ification, 2668 auth_skipped, auth_offset, auth_len, vrf_id, port); 2669 } else { 2670 /* this is abnormal... cookie-echo on existing TCB */ 2671 had_a_existing_tcb = 1; 2672 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2673 cookie, cookie_len, *inp_p, *stcb, netp, to, 2674 ¬ification, vrf_id, auth_skipped, auth_offset, auth_len, port); 2675 } 2676 2677 if (*stcb == NULL) { 2678 /* still no TCB... must be bad cookie-echo */ 2679 return (NULL); 2680 } 2681 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2682 (*netp)->flowid = m->m_pkthdr.flowid; 2683 #ifdef INVARIANTS 2684 (*netp)->flowidset = 1; 2685 #endif 2686 } 2687 /* 2688 * Ok, we built an association so confirm the address we sent the 2689 * INIT-ACK to. 2690 */ 2691 netl = sctp_findnet(*stcb, to); 2692 /* 2693 * This code should in theory NOT run but 2694 */ 2695 if (netl == NULL) { 2696 /* TSNH! Huh, why do I need to add this address here? */ 2697 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2698 return (NULL); 2699 } 2700 netl = sctp_findnet(*stcb, to); 2701 } 2702 if (netl) { 2703 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2704 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2705 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2706 netl); 2707 send_int_conf = 1; 2708 } 2709 } 2710 sctp_start_net_timers(*stcb); 2711 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2712 if (!had_a_existing_tcb || 2713 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2714 /* 2715 * If we have a NEW cookie or the connect never 2716 * reached the connected state during collision we 2717 * must do the TCP accept thing. 2718 */ 2719 struct socket *so, *oso; 2720 struct sctp_inpcb *inp; 2721 2722 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2723 /* 2724 * For a restart we will keep the same 2725 * socket, no need to do anything. I THINK!! 2726 */ 2727 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2728 if (send_int_conf) { 2729 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2730 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2731 } 2732 return (m); 2733 } 2734 oso = (*inp_p)->sctp_socket; 2735 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2736 SCTP_TCB_UNLOCK((*stcb)); 2737 CURVNET_SET(oso->so_vnet); 2738 so = sonewconn(oso, 0 2739 ); 2740 CURVNET_RESTORE(); 2741 SCTP_TCB_LOCK((*stcb)); 2742 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2743 2744 if (so == NULL) { 2745 struct mbuf *op_err; 2746 2747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2748 struct socket *pcb_so; 2749 2750 #endif 2751 /* Too many sockets */ 2752 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2753 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2754 sctp_abort_association(*inp_p, NULL, m, iphlen, 2755 sh, op_err, vrf_id, port); 2756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2757 pcb_so = SCTP_INP_SO(*inp_p); 2758 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2759 SCTP_TCB_UNLOCK((*stcb)); 2760 SCTP_SOCKET_LOCK(pcb_so, 1); 2761 SCTP_TCB_LOCK((*stcb)); 2762 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2763 #endif 2764 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2765 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2766 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2767 #endif 2768 return (NULL); 2769 } 2770 inp = (struct sctp_inpcb *)so->so_pcb; 2771 SCTP_INP_INCR_REF(inp); 2772 /* 2773 * We add the unbound flag here so that if we get an 2774 * soabort() before we get the move_pcb done, we 2775 * will properly cleanup. 2776 */ 2777 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2778 SCTP_PCB_FLAGS_CONNECTED | 2779 SCTP_PCB_FLAGS_IN_TCPPOOL | 2780 SCTP_PCB_FLAGS_UNBOUND | 2781 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2782 SCTP_PCB_FLAGS_DONT_WAKE); 2783 inp->sctp_features = (*inp_p)->sctp_features; 2784 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2785 inp->sctp_socket = so; 2786 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2787 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2788 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2789 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2790 inp->sctp_context = (*inp_p)->sctp_context; 2791 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2792 inp->inp_starting_point_for_iterator = NULL; 2793 /* 2794 * copy in the authentication parameters from the 2795 * original endpoint 2796 */ 2797 if (inp->sctp_ep.local_hmacs) 2798 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2799 inp->sctp_ep.local_hmacs = 2800 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2801 if (inp->sctp_ep.local_auth_chunks) 2802 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2803 inp->sctp_ep.local_auth_chunks = 2804 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2805 2806 /* 2807 * Now we must move it from one hash table to 2808 * another and get the tcb in the right place. 2809 */ 2810 2811 /* 2812 * This is where the one-2-one socket is put into 2813 * the accept state waiting for the accept! 2814 */ 2815 if (*stcb) { 2816 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2817 } 2818 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2819 2820 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2821 SCTP_TCB_UNLOCK((*stcb)); 2822 2823 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2824 0); 2825 SCTP_TCB_LOCK((*stcb)); 2826 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2827 2828 2829 /* 2830 * now we must check to see if we were aborted while 2831 * the move was going on and the lock/unlock 2832 * happened. 2833 */ 2834 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2835 /* 2836 * yep it was, we leave the assoc attached 2837 * to the socket since the sctp_inpcb_free() 2838 * call will send an abort for us. 2839 */ 2840 SCTP_INP_DECR_REF(inp); 2841 return (NULL); 2842 } 2843 SCTP_INP_DECR_REF(inp); 2844 /* Switch over to the new guy */ 2845 *inp_p = inp; 2846 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2847 if (send_int_conf) { 2848 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2849 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2850 } 2851 /* 2852 * Pull it from the incomplete queue and wake the 2853 * guy 2854 */ 2855 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2856 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2857 SCTP_TCB_UNLOCK((*stcb)); 2858 SCTP_SOCKET_LOCK(so, 1); 2859 #endif 2860 soisconnected(so); 2861 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2862 SCTP_TCB_LOCK((*stcb)); 2863 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2864 SCTP_SOCKET_UNLOCK(so, 1); 2865 #endif 2866 return (m); 2867 } 2868 } 2869 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2870 if (notification) { 2871 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2872 } 2873 if (send_int_conf) { 2874 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2875 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2876 } 2877 } 2878 return (m); 2879 } 2880 2881 static void 2882 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2883 struct sctp_tcb *stcb, struct sctp_nets *net) 2884 { 2885 /* cp must not be used, others call this without a c-ack :-) */ 2886 struct sctp_association *asoc; 2887 2888 SCTPDBG(SCTP_DEBUG_INPUT2, 2889 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2890 if (stcb == NULL) 2891 return; 2892 2893 asoc = &stcb->asoc; 2894 2895 sctp_stop_all_cookie_timers(stcb); 2896 /* process according to association state */ 2897 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2898 /* state change only needed when I am in right state */ 2899 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2900 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2901 sctp_start_net_timers(stcb); 2902 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2903 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2904 stcb->sctp_ep, stcb, asoc->primary_destination); 2905 2906 } 2907 /* update RTO */ 2908 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2909 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2910 if (asoc->overall_error_count == 0) { 2911 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2912 &asoc->time_entered, sctp_align_safe_nocopy, 2913 SCTP_RTT_FROM_NON_DATA); 2914 } 2915 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2916 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2917 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2918 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2919 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2920 struct socket *so; 2921 2922 #endif 2923 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2924 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2925 so = SCTP_INP_SO(stcb->sctp_ep); 2926 atomic_add_int(&stcb->asoc.refcnt, 1); 2927 SCTP_TCB_UNLOCK(stcb); 2928 SCTP_SOCKET_LOCK(so, 1); 2929 SCTP_TCB_LOCK(stcb); 2930 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2931 #endif 2932 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2933 soisconnected(stcb->sctp_socket); 2934 } 2935 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2936 SCTP_SOCKET_UNLOCK(so, 1); 2937 #endif 2938 } 2939 /* 2940 * since we did not send a HB make sure we don't double 2941 * things 2942 */ 2943 net->hb_responded = 1; 2944 2945 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2946 /* 2947 * We don't need to do the asconf thing, nor hb or 2948 * autoclose if the socket is closed. 2949 */ 2950 goto closed_socket; 2951 } 2952 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2953 stcb, net); 2954 2955 2956 if (stcb->asoc.sctp_autoclose_ticks && 2957 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2958 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2959 stcb->sctp_ep, stcb, NULL); 2960 } 2961 /* 2962 * send ASCONF if parameters are pending and ASCONFs are 2963 * allowed (eg. addresses changed when init/cookie echo were 2964 * in flight) 2965 */ 2966 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2967 (stcb->asoc.peer_supports_asconf) && 2968 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2969 #ifdef SCTP_TIMER_BASED_ASCONF 2970 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2971 stcb->sctp_ep, stcb, 2972 stcb->asoc.primary_destination); 2973 #else 2974 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2975 SCTP_ADDR_NOT_LOCKED); 2976 #endif 2977 } 2978 } 2979 closed_socket: 2980 /* Toss the cookie if I can */ 2981 sctp_toss_old_cookies(stcb, asoc); 2982 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2983 /* Restart the timer if we have pending data */ 2984 struct sctp_tmit_chunk *chk; 2985 2986 chk = TAILQ_FIRST(&asoc->sent_queue); 2987 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2988 } 2989 } 2990 2991 static void 2992 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2993 struct sctp_tcb *stcb) 2994 { 2995 struct sctp_nets *net; 2996 struct sctp_tmit_chunk *lchk; 2997 struct sctp_ecne_chunk bkup; 2998 uint8_t override_bit; 2999 uint32_t tsn, window_data_tsn; 3000 int len; 3001 unsigned int pkt_cnt; 3002 3003 len = ntohs(cp->ch.chunk_length); 3004 if ((len != sizeof(struct sctp_ecne_chunk)) && 3005 (len != sizeof(struct old_sctp_ecne_chunk))) { 3006 return; 3007 } 3008 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3009 /* Its the old format */ 3010 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3011 bkup.num_pkts_since_cwr = htonl(1); 3012 cp = &bkup; 3013 } 3014 SCTP_STAT_INCR(sctps_recvecne); 3015 tsn = ntohl(cp->tsn); 3016 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3017 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3018 if (lchk == NULL) { 3019 window_data_tsn = stcb->asoc.sending_seq - 1; 3020 } else { 3021 window_data_tsn = lchk->rec.data.TSN_seq; 3022 } 3023 3024 /* Find where it was sent to if possible. */ 3025 net = NULL; 3026 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3027 if (lchk->rec.data.TSN_seq == tsn) { 3028 net = lchk->whoTo; 3029 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3030 break; 3031 } 3032 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3033 break; 3034 } 3035 } 3036 if (net == NULL) { 3037 /* 3038 * What to do. A previous send of a CWR was possibly lost. 3039 * See how old it is, we may have it marked on the actual 3040 * net. 3041 */ 3042 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3043 if (tsn == net->last_cwr_tsn) { 3044 /* Found him, send it off */ 3045 break; 3046 } 3047 } 3048 if (net == NULL) { 3049 /* 3050 * If we reach here, we need to send a special CWR 3051 * that says hey, we did this a long time ago and 3052 * you lost the response. 3053 */ 3054 net = TAILQ_FIRST(&stcb->asoc.nets); 3055 if (net == NULL) { 3056 /* TSNH */ 3057 return; 3058 } 3059 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3060 } else { 3061 override_bit = 0; 3062 } 3063 } else { 3064 override_bit = 0; 3065 } 3066 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3067 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3068 /* 3069 * JRS - Use the congestion control given in the pluggable 3070 * CC module 3071 */ 3072 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3073 /* 3074 * We reduce once every RTT. So we will only lower cwnd at 3075 * the next sending seq i.e. the window_data_tsn 3076 */ 3077 net->cwr_window_tsn = window_data_tsn; 3078 net->ecn_ce_pkt_cnt += pkt_cnt; 3079 net->lost_cnt = pkt_cnt; 3080 net->last_cwr_tsn = tsn; 3081 } else { 3082 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3083 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3084 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3085 /* 3086 * Another loss in the same window update how many 3087 * marks/packets lost we have had. 3088 */ 3089 int cnt = 1; 3090 3091 if (pkt_cnt > net->lost_cnt) { 3092 /* Should be the case */ 3093 cnt = (pkt_cnt - net->lost_cnt); 3094 net->ecn_ce_pkt_cnt += cnt; 3095 } 3096 net->lost_cnt = pkt_cnt; 3097 net->last_cwr_tsn = tsn; 3098 /* 3099 * Most CC functions will ignore this call, since we 3100 * are in-window yet of the initial CE the peer saw. 3101 */ 3102 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3103 } 3104 } 3105 /* 3106 * We always send a CWR this way if our previous one was lost our 3107 * peer will get an update, or if it is not time again to reduce we 3108 * still get the cwr to the peer. Note we set the override when we 3109 * could not find the TSN on the chunk or the destination network. 3110 */ 3111 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3112 } 3113 3114 static void 3115 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3116 { 3117 /* 3118 * Here we get a CWR from the peer. We must look in the outqueue and 3119 * make sure that we have a covered ECNE in teh control chunk part. 3120 * If so remove it. 3121 */ 3122 struct sctp_tmit_chunk *chk; 3123 struct sctp_ecne_chunk *ecne; 3124 int override; 3125 uint32_t cwr_tsn; 3126 3127 cwr_tsn = ntohl(cp->tsn); 3128 3129 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3130 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3131 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3132 continue; 3133 } 3134 if ((override == 0) && (chk->whoTo != net)) { 3135 /* Must be from the right src unless override is set */ 3136 continue; 3137 } 3138 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3139 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3140 /* this covers this ECNE, we can remove it */ 3141 stcb->asoc.ecn_echo_cnt_onq--; 3142 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3143 sctp_next); 3144 if (chk->data) { 3145 sctp_m_freem(chk->data); 3146 chk->data = NULL; 3147 } 3148 stcb->asoc.ctrl_queue_cnt--; 3149 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3150 if (override == 0) { 3151 break; 3152 } 3153 } 3154 } 3155 } 3156 3157 static void 3158 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3159 struct sctp_tcb *stcb, struct sctp_nets *net) 3160 { 3161 struct sctp_association *asoc; 3162 3163 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3164 struct socket *so; 3165 3166 #endif 3167 3168 SCTPDBG(SCTP_DEBUG_INPUT2, 3169 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3170 if (stcb == NULL) 3171 return; 3172 3173 asoc = &stcb->asoc; 3174 /* process according to association state */ 3175 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3176 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3177 SCTPDBG(SCTP_DEBUG_INPUT2, 3178 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3179 SCTP_TCB_UNLOCK(stcb); 3180 return; 3181 } 3182 /* notify upper layer protocol */ 3183 if (stcb->sctp_socket) { 3184 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3185 /* are the queues empty? they should be */ 3186 if (!TAILQ_EMPTY(&asoc->send_queue) || 3187 !TAILQ_EMPTY(&asoc->sent_queue) || 3188 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3189 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3190 } 3191 } 3192 /* stop the timer */ 3193 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3194 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3195 /* free the TCB */ 3196 SCTPDBG(SCTP_DEBUG_INPUT2, 3197 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3198 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3199 so = SCTP_INP_SO(stcb->sctp_ep); 3200 atomic_add_int(&stcb->asoc.refcnt, 1); 3201 SCTP_TCB_UNLOCK(stcb); 3202 SCTP_SOCKET_LOCK(so, 1); 3203 SCTP_TCB_LOCK(stcb); 3204 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3205 #endif 3206 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3207 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3208 SCTP_SOCKET_UNLOCK(so, 1); 3209 #endif 3210 return; 3211 } 3212 3213 static int 3214 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3215 struct sctp_nets *net, uint8_t flg) 3216 { 3217 switch (desc->chunk_type) { 3218 case SCTP_DATA: 3219 /* find the tsn to resend (possibly */ 3220 { 3221 uint32_t tsn; 3222 struct sctp_tmit_chunk *tp1; 3223 3224 tsn = ntohl(desc->tsn_ifany); 3225 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3226 if (tp1->rec.data.TSN_seq == tsn) { 3227 /* found it */ 3228 break; 3229 } 3230 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3231 /* not found */ 3232 tp1 = NULL; 3233 break; 3234 } 3235 } 3236 if (tp1 == NULL) { 3237 /* 3238 * Do it the other way , aka without paying 3239 * attention to queue seq order. 3240 */ 3241 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3242 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3243 if (tp1->rec.data.TSN_seq == tsn) { 3244 /* found it */ 3245 break; 3246 } 3247 } 3248 } 3249 if (tp1 == NULL) { 3250 SCTP_STAT_INCR(sctps_pdrptsnnf); 3251 } 3252 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3253 uint8_t *ddp; 3254 3255 if (((flg & SCTP_BADCRC) == 0) && 3256 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3257 return (0); 3258 } 3259 if ((stcb->asoc.peers_rwnd == 0) && 3260 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3261 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3262 return (0); 3263 } 3264 if (stcb->asoc.peers_rwnd == 0 && 3265 (flg & SCTP_FROM_MIDDLE_BOX)) { 3266 SCTP_STAT_INCR(sctps_pdrpdizrw); 3267 return (0); 3268 } 3269 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3270 sizeof(struct sctp_data_chunk)); 3271 { 3272 unsigned int iii; 3273 3274 for (iii = 0; iii < sizeof(desc->data_bytes); 3275 iii++) { 3276 if (ddp[iii] != desc->data_bytes[iii]) { 3277 SCTP_STAT_INCR(sctps_pdrpbadd); 3278 return (-1); 3279 } 3280 } 3281 } 3282 3283 if (tp1->do_rtt) { 3284 /* 3285 * this guy had a RTO calculation 3286 * pending on it, cancel it 3287 */ 3288 if (tp1->whoTo->rto_needed == 0) { 3289 tp1->whoTo->rto_needed = 1; 3290 } 3291 tp1->do_rtt = 0; 3292 } 3293 SCTP_STAT_INCR(sctps_pdrpmark); 3294 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3295 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3296 /* 3297 * mark it as if we were doing a FR, since 3298 * we will be getting gap ack reports behind 3299 * the info from the router. 3300 */ 3301 tp1->rec.data.doing_fast_retransmit = 1; 3302 /* 3303 * mark the tsn with what sequences can 3304 * cause a new FR. 3305 */ 3306 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3307 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3308 } else { 3309 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3310 } 3311 3312 /* restart the timer */ 3313 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3314 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3315 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3316 stcb, tp1->whoTo); 3317 3318 /* fix counts and things */ 3319 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3320 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3321 tp1->whoTo->flight_size, 3322 tp1->book_size, 3323 (uintptr_t) stcb, 3324 tp1->rec.data.TSN_seq); 3325 } 3326 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3327 sctp_flight_size_decrease(tp1); 3328 sctp_total_flight_decrease(stcb, tp1); 3329 } 3330 tp1->sent = SCTP_DATAGRAM_RESEND; 3331 } { 3332 /* audit code */ 3333 unsigned int audit; 3334 3335 audit = 0; 3336 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3337 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3338 audit++; 3339 } 3340 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3341 sctp_next) { 3342 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3343 audit++; 3344 } 3345 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3346 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3347 audit, stcb->asoc.sent_queue_retran_cnt); 3348 #ifndef SCTP_AUDITING_ENABLED 3349 stcb->asoc.sent_queue_retran_cnt = audit; 3350 #endif 3351 } 3352 } 3353 } 3354 break; 3355 case SCTP_ASCONF: 3356 { 3357 struct sctp_tmit_chunk *asconf; 3358 3359 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3360 sctp_next) { 3361 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3362 break; 3363 } 3364 } 3365 if (asconf) { 3366 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3367 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3368 asconf->sent = SCTP_DATAGRAM_RESEND; 3369 asconf->snd_count--; 3370 } 3371 } 3372 break; 3373 case SCTP_INITIATION: 3374 /* resend the INIT */ 3375 stcb->asoc.dropped_special_cnt++; 3376 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3377 /* 3378 * If we can get it in, in a few attempts we do 3379 * this, otherwise we let the timer fire. 3380 */ 3381 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3382 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3383 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3384 } 3385 break; 3386 case SCTP_SELECTIVE_ACK: 3387 case SCTP_NR_SELECTIVE_ACK: 3388 /* resend the sack */ 3389 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3390 break; 3391 case SCTP_HEARTBEAT_REQUEST: 3392 /* resend a demand HB */ 3393 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3394 /* 3395 * Only retransmit if we KNOW we wont destroy the 3396 * tcb 3397 */ 3398 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3399 } 3400 break; 3401 case SCTP_SHUTDOWN: 3402 sctp_send_shutdown(stcb, net); 3403 break; 3404 case SCTP_SHUTDOWN_ACK: 3405 sctp_send_shutdown_ack(stcb, net); 3406 break; 3407 case SCTP_COOKIE_ECHO: 3408 { 3409 struct sctp_tmit_chunk *cookie; 3410 3411 cookie = NULL; 3412 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3413 sctp_next) { 3414 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3415 break; 3416 } 3417 } 3418 if (cookie) { 3419 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3420 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3421 cookie->sent = SCTP_DATAGRAM_RESEND; 3422 sctp_stop_all_cookie_timers(stcb); 3423 } 3424 } 3425 break; 3426 case SCTP_COOKIE_ACK: 3427 sctp_send_cookie_ack(stcb); 3428 break; 3429 case SCTP_ASCONF_ACK: 3430 /* resend last asconf ack */ 3431 sctp_send_asconf_ack(stcb); 3432 break; 3433 case SCTP_FORWARD_CUM_TSN: 3434 send_forward_tsn(stcb, &stcb->asoc); 3435 break; 3436 /* can't do anything with these */ 3437 case SCTP_PACKET_DROPPED: 3438 case SCTP_INITIATION_ACK: /* this should not happen */ 3439 case SCTP_HEARTBEAT_ACK: 3440 case SCTP_ABORT_ASSOCIATION: 3441 case SCTP_OPERATION_ERROR: 3442 case SCTP_SHUTDOWN_COMPLETE: 3443 case SCTP_ECN_ECHO: 3444 case SCTP_ECN_CWR: 3445 default: 3446 break; 3447 } 3448 return (0); 3449 } 3450 3451 void 3452 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3453 { 3454 int i; 3455 uint16_t temp; 3456 3457 /* 3458 * We set things to 0xffff since this is the last delivered sequence 3459 * and we will be sending in 0 after the reset. 3460 */ 3461 3462 if (number_entries) { 3463 for (i = 0; i < number_entries; i++) { 3464 temp = ntohs(list[i]); 3465 if (temp >= stcb->asoc.streamincnt) { 3466 continue; 3467 } 3468 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3469 } 3470 } else { 3471 list = NULL; 3472 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3473 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3474 } 3475 } 3476 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3477 } 3478 3479 static void 3480 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3481 { 3482 int i; 3483 3484 if (number_entries == 0) { 3485 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3486 stcb->asoc.strmout[i].next_sequence_sent = 0; 3487 } 3488 } else if (number_entries) { 3489 for (i = 0; i < number_entries; i++) { 3490 uint16_t temp; 3491 3492 temp = ntohs(list[i]); 3493 if (temp >= stcb->asoc.streamoutcnt) { 3494 /* no such stream */ 3495 continue; 3496 } 3497 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3498 } 3499 } 3500 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3501 } 3502 3503 3504 struct sctp_stream_reset_out_request * 3505 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3506 { 3507 struct sctp_association *asoc; 3508 struct sctp_stream_reset_out_req *req; 3509 struct sctp_stream_reset_out_request *r; 3510 struct sctp_tmit_chunk *chk; 3511 int len, clen; 3512 3513 asoc = &stcb->asoc; 3514 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3515 asoc->stream_reset_outstanding = 0; 3516 return (NULL); 3517 } 3518 if (stcb->asoc.str_reset == NULL) { 3519 asoc->stream_reset_outstanding = 0; 3520 return (NULL); 3521 } 3522 chk = stcb->asoc.str_reset; 3523 if (chk->data == NULL) { 3524 return (NULL); 3525 } 3526 if (bchk) { 3527 /* he wants a copy of the chk pointer */ 3528 *bchk = chk; 3529 } 3530 clen = chk->send_size; 3531 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3532 r = &req->sr_req; 3533 if (ntohl(r->request_seq) == seq) { 3534 /* found it */ 3535 return (r); 3536 } 3537 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3538 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3539 /* move to the next one, there can only be a max of two */ 3540 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3541 if (ntohl(r->request_seq) == seq) { 3542 return (r); 3543 } 3544 } 3545 /* that seq is not here */ 3546 return (NULL); 3547 } 3548 3549 static void 3550 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3551 { 3552 struct sctp_association *asoc; 3553 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3554 3555 if (stcb->asoc.str_reset == NULL) { 3556 return; 3557 } 3558 asoc = &stcb->asoc; 3559 3560 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3561 TAILQ_REMOVE(&asoc->control_send_queue, 3562 chk, 3563 sctp_next); 3564 if (chk->data) { 3565 sctp_m_freem(chk->data); 3566 chk->data = NULL; 3567 } 3568 asoc->ctrl_queue_cnt--; 3569 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3570 /* sa_ignore NO_NULL_CHK */ 3571 stcb->asoc.str_reset = NULL; 3572 } 3573 3574 3575 static int 3576 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3577 uint32_t seq, uint32_t action, 3578 struct sctp_stream_reset_response *respin) 3579 { 3580 uint16_t type; 3581 int lparm_len; 3582 struct sctp_association *asoc = &stcb->asoc; 3583 struct sctp_tmit_chunk *chk; 3584 struct sctp_stream_reset_out_request *srparam; 3585 int number_entries; 3586 3587 if (asoc->stream_reset_outstanding == 0) { 3588 /* duplicate */ 3589 return (0); 3590 } 3591 if (seq == stcb->asoc.str_reset_seq_out) { 3592 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3593 if (srparam) { 3594 stcb->asoc.str_reset_seq_out++; 3595 type = ntohs(srparam->ph.param_type); 3596 lparm_len = ntohs(srparam->ph.param_length); 3597 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3598 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3599 asoc->stream_reset_out_is_outstanding = 0; 3600 if (asoc->stream_reset_outstanding) 3601 asoc->stream_reset_outstanding--; 3602 if (action == SCTP_STREAM_RESET_PERFORMED) { 3603 /* do it */ 3604 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3605 } else { 3606 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3607 } 3608 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3609 /* Answered my request */ 3610 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3611 if (asoc->stream_reset_outstanding) 3612 asoc->stream_reset_outstanding--; 3613 if (action != SCTP_STREAM_RESET_PERFORMED) { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3615 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3616 } 3617 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3618 /* Ok we now may have more streams */ 3619 int num_stream; 3620 3621 num_stream = stcb->asoc.strm_pending_add_size; 3622 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3623 /* TSNH */ 3624 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3625 } 3626 stcb->asoc.strm_pending_add_size = 0; 3627 if (asoc->stream_reset_outstanding) 3628 asoc->stream_reset_outstanding--; 3629 if (action == SCTP_STREAM_RESET_PERFORMED) { 3630 /* Put the new streams into effect */ 3631 stcb->asoc.streamoutcnt += num_stream; 3632 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3633 } else { 3634 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3635 SCTP_STREAM_CHANGED_DENIED); 3636 } 3637 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3638 if (asoc->stream_reset_outstanding) 3639 asoc->stream_reset_outstanding--; 3640 if (action != SCTP_STREAM_RESET_PERFORMED) { 3641 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3642 SCTP_STREAM_CHANGED_DENIED); 3643 } 3644 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3645 /** 3646 * a) Adopt the new in tsn. 3647 * b) reset the map 3648 * c) Adopt the new out-tsn 3649 */ 3650 struct sctp_stream_reset_response_tsn *resp; 3651 struct sctp_forward_tsn_chunk fwdtsn; 3652 int abort_flag = 0; 3653 3654 if (respin == NULL) { 3655 /* huh ? */ 3656 return (0); 3657 } 3658 if (action == SCTP_STREAM_RESET_PERFORMED) { 3659 resp = (struct sctp_stream_reset_response_tsn *)respin; 3660 asoc->stream_reset_outstanding--; 3661 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3662 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3663 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3664 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3665 if (abort_flag) { 3666 return (1); 3667 } 3668 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3669 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3670 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3671 } 3672 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3673 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3674 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3675 3676 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3677 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3678 3679 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3680 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3681 3682 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3683 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3684 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3685 } else { 3686 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3687 SCTP_STREAM_RESET_FAILED); 3688 } 3689 } 3690 /* get rid of the request and get the request flags */ 3691 if (asoc->stream_reset_outstanding == 0) { 3692 sctp_clean_up_stream_reset(stcb); 3693 } 3694 } 3695 } 3696 return (0); 3697 } 3698 3699 static void 3700 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3701 struct sctp_tmit_chunk *chk, 3702 struct sctp_stream_reset_in_request *req, int trunc) 3703 { 3704 uint32_t seq; 3705 int len, i; 3706 int number_entries; 3707 uint16_t temp; 3708 3709 /* 3710 * peer wants me to send a str-reset to him for my outgoing seq's if 3711 * seq_in is right. 3712 */ 3713 struct sctp_association *asoc = &stcb->asoc; 3714 3715 seq = ntohl(req->request_seq); 3716 if (asoc->str_reset_seq_in == seq) { 3717 if (trunc) { 3718 /* Can't do it, since they exceeded our buffer size */ 3719 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3720 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3721 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3722 len = ntohs(req->ph.param_length); 3723 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3724 for (i = 0; i < number_entries; i++) { 3725 temp = ntohs(req->list_of_streams[i]); 3726 req->list_of_streams[i] = temp; 3727 } 3728 /* move the reset action back one */ 3729 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3730 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3731 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3732 asoc->str_reset_seq_out, 3733 seq, (asoc->sending_seq - 1)); 3734 asoc->stream_reset_out_is_outstanding = 1; 3735 asoc->str_reset = chk; 3736 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3737 stcb->asoc.stream_reset_outstanding++; 3738 } else { 3739 /* Can't do it, since we have sent one out */ 3740 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3741 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3742 } 3743 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3744 asoc->str_reset_seq_in++; 3745 } else if (asoc->str_reset_seq_in - 1 == seq) { 3746 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3747 } else if (asoc->str_reset_seq_in - 2 == seq) { 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3749 } else { 3750 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3751 } 3752 } 3753 3754 static int 3755 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3756 struct sctp_tmit_chunk *chk, 3757 struct sctp_stream_reset_tsn_request *req) 3758 { 3759 /* reset all in and out and update the tsn */ 3760 /* 3761 * A) reset my str-seq's on in and out. B) Select a receive next, 3762 * and set cum-ack to it. Also process this selected number as a 3763 * fwd-tsn as well. C) set in the response my next sending seq. 3764 */ 3765 struct sctp_forward_tsn_chunk fwdtsn; 3766 struct sctp_association *asoc = &stcb->asoc; 3767 int abort_flag = 0; 3768 uint32_t seq; 3769 3770 seq = ntohl(req->request_seq); 3771 if (asoc->str_reset_seq_in == seq) { 3772 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3773 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3774 fwdtsn.ch.chunk_flags = 0; 3775 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3776 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3777 if (abort_flag) { 3778 return (1); 3779 } 3780 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3781 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3782 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3783 } 3784 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3785 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3786 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3787 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3788 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3789 atomic_add_int(&stcb->asoc.sending_seq, 1); 3790 /* save off historical data for retrans */ 3791 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3792 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3793 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3794 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3795 3796 sctp_add_stream_reset_result_tsn(chk, 3797 ntohl(req->request_seq), 3798 SCTP_STREAM_RESET_PERFORMED, 3799 stcb->asoc.sending_seq, 3800 stcb->asoc.mapping_array_base_tsn); 3801 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3802 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3803 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3804 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3805 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3806 asoc->str_reset_seq_in++; 3807 } else if (asoc->str_reset_seq_in - 1 == seq) { 3808 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3809 stcb->asoc.last_sending_seq[0], 3810 stcb->asoc.last_base_tsnsent[0] 3811 ); 3812 } else if (asoc->str_reset_seq_in - 2 == seq) { 3813 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3814 stcb->asoc.last_sending_seq[1], 3815 stcb->asoc.last_base_tsnsent[1] 3816 ); 3817 } else { 3818 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3819 } 3820 return (0); 3821 } 3822 3823 static void 3824 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3825 struct sctp_tmit_chunk *chk, 3826 struct sctp_stream_reset_out_request *req, int trunc) 3827 { 3828 uint32_t seq, tsn; 3829 int number_entries, len; 3830 struct sctp_association *asoc = &stcb->asoc; 3831 3832 seq = ntohl(req->request_seq); 3833 3834 /* now if its not a duplicate we process it */ 3835 if (asoc->str_reset_seq_in == seq) { 3836 len = ntohs(req->ph.param_length); 3837 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3838 /* 3839 * the sender is resetting, handle the list issue.. we must 3840 * a) verify if we can do the reset, if so no problem b) If 3841 * we can't do the reset we must copy the request. c) queue 3842 * it, and setup the data in processor to trigger it off 3843 * when needed and dequeue all the queued data. 3844 */ 3845 tsn = ntohl(req->send_reset_at_tsn); 3846 3847 /* move the reset action back one */ 3848 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3849 if (trunc) { 3850 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3851 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3852 /* we can do it now */ 3853 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3855 } else { 3856 /* 3857 * we must queue it up and thus wait for the TSN's 3858 * to arrive that are at or before tsn 3859 */ 3860 struct sctp_stream_reset_list *liste; 3861 int siz; 3862 3863 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3864 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3865 siz, SCTP_M_STRESET); 3866 if (liste == NULL) { 3867 /* gak out of memory */ 3868 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_REJECT); 3869 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3870 return; 3871 } 3872 liste->tsn = tsn; 3873 liste->number_entries = number_entries; 3874 memcpy(&liste->req, req, 3875 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3876 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3877 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3878 } 3879 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3880 asoc->str_reset_seq_in++; 3881 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3882 /* 3883 * one seq back, just echo back last action since my 3884 * response was lost. 3885 */ 3886 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3887 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3888 /* 3889 * two seq back, just echo back last action since my 3890 * response was lost. 3891 */ 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3893 } else { 3894 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3895 } 3896 } 3897 3898 static void 3899 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3900 struct sctp_stream_reset_add_strm *str_add) 3901 { 3902 /* 3903 * Peer is requesting to add more streams. If its within our 3904 * max-streams we will allow it. 3905 */ 3906 uint32_t num_stream, i; 3907 uint32_t seq; 3908 struct sctp_association *asoc = &stcb->asoc; 3909 struct sctp_queued_to_read *ctl, *nctl; 3910 3911 /* Get the number. */ 3912 seq = ntohl(str_add->request_seq); 3913 num_stream = ntohs(str_add->number_of_streams); 3914 /* Now what would be the new total? */ 3915 if (asoc->str_reset_seq_in == seq) { 3916 num_stream += stcb->asoc.streamincnt; 3917 if ((num_stream > stcb->asoc.max_inbound_streams) || 3918 (num_stream > 0xffff)) { 3919 /* We must reject it they ask for to many */ 3920 denied: 3921 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3922 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3923 } else { 3924 /* Ok, we can do that :-) */ 3925 struct sctp_stream_in *oldstrm; 3926 3927 /* save off the old */ 3928 oldstrm = stcb->asoc.strmin; 3929 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3930 (num_stream * sizeof(struct sctp_stream_in)), 3931 SCTP_M_STRMI); 3932 if (stcb->asoc.strmin == NULL) { 3933 stcb->asoc.strmin = oldstrm; 3934 goto denied; 3935 } 3936 /* copy off the old data */ 3937 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3938 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3939 stcb->asoc.strmin[i].stream_no = i; 3940 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3941 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3942 /* now anything on those queues? */ 3943 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3944 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3945 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3946 } 3947 } 3948 /* Init the new streams */ 3949 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3950 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3951 stcb->asoc.strmin[i].stream_no = i; 3952 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3953 stcb->asoc.strmin[i].delivery_started = 0; 3954 } 3955 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3956 /* update the size */ 3957 stcb->asoc.streamincnt = num_stream; 3958 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3959 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3960 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3961 } 3962 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3963 asoc->str_reset_seq_in++; 3964 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3965 /* 3966 * one seq back, just echo back last action since my 3967 * response was lost. 3968 */ 3969 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3970 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3971 /* 3972 * two seq back, just echo back last action since my 3973 * response was lost. 3974 */ 3975 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3976 } else { 3977 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3978 3979 } 3980 } 3981 3982 static void 3983 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3984 struct sctp_stream_reset_add_strm *str_add) 3985 { 3986 /* 3987 * Peer is requesting to add more streams. If its within our 3988 * max-streams we will allow it. 3989 */ 3990 uint16_t num_stream; 3991 uint32_t seq; 3992 struct sctp_association *asoc = &stcb->asoc; 3993 3994 /* Get the number. */ 3995 seq = ntohl(str_add->request_seq); 3996 num_stream = ntohs(str_add->number_of_streams); 3997 /* Now what would be the new total? */ 3998 if (asoc->str_reset_seq_in == seq) { 3999 if (stcb->asoc.stream_reset_outstanding) { 4000 /* We must reject it we have something pending */ 4001 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4002 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4003 } else { 4004 /* Ok, we can do that :-) */ 4005 int mychk; 4006 4007 mychk = stcb->asoc.streamoutcnt; 4008 mychk += num_stream; 4009 if (mychk < 0x10000) { 4010 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4011 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 4012 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4014 } 4015 } else { 4016 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4017 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4018 } 4019 } 4020 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4021 asoc->str_reset_seq_in++; 4022 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4023 /* 4024 * one seq back, just echo back last action since my 4025 * response was lost. 4026 */ 4027 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4028 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4029 /* 4030 * two seq back, just echo back last action since my 4031 * response was lost. 4032 */ 4033 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4034 } else { 4035 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 4036 } 4037 } 4038 4039 #ifdef __GNUC__ 4040 __attribute__((noinline)) 4041 #endif 4042 static int 4043 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4044 struct sctp_stream_reset_out_req *sr_req) 4045 { 4046 int chk_length, param_len, ptype; 4047 struct sctp_paramhdr pstore; 4048 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4049 4050 uint32_t seq = 0; 4051 int num_req = 0; 4052 int trunc = 0; 4053 struct sctp_tmit_chunk *chk; 4054 struct sctp_chunkhdr *ch; 4055 struct sctp_paramhdr *ph; 4056 int ret_code = 0; 4057 int num_param = 0; 4058 4059 /* now it may be a reset or a reset-response */ 4060 chk_length = ntohs(sr_req->ch.chunk_length); 4061 4062 /* setup for adding the response */ 4063 sctp_alloc_a_chunk(stcb, chk); 4064 if (chk == NULL) { 4065 return (ret_code); 4066 } 4067 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4068 chk->rec.chunk_id.can_take_data = 0; 4069 chk->asoc = &stcb->asoc; 4070 chk->no_fr_allowed = 0; 4071 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4072 chk->book_size_scale = 0; 4073 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4074 if (chk->data == NULL) { 4075 strres_nochunk: 4076 if (chk->data) { 4077 sctp_m_freem(chk->data); 4078 chk->data = NULL; 4079 } 4080 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4081 return (ret_code); 4082 } 4083 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4084 4085 /* setup chunk parameters */ 4086 chk->sent = SCTP_DATAGRAM_UNSENT; 4087 chk->snd_count = 0; 4088 chk->whoTo = NULL; 4089 4090 ch = mtod(chk->data, struct sctp_chunkhdr *); 4091 ch->chunk_type = SCTP_STREAM_RESET; 4092 ch->chunk_flags = 0; 4093 ch->chunk_length = htons(chk->send_size); 4094 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4095 offset += sizeof(struct sctp_chunkhdr); 4096 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4097 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4098 if (ph == NULL) 4099 break; 4100 param_len = ntohs(ph->param_length); 4101 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4102 /* bad param */ 4103 break; 4104 } 4105 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4106 (uint8_t *) & cstore); 4107 ptype = ntohs(ph->param_type); 4108 num_param++; 4109 if (param_len > (int)sizeof(cstore)) { 4110 trunc = 1; 4111 } else { 4112 trunc = 0; 4113 } 4114 if (num_param > SCTP_MAX_RESET_PARAMS) { 4115 /* hit the max of parameters already sorry.. */ 4116 break; 4117 } 4118 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4119 struct sctp_stream_reset_out_request *req_out; 4120 4121 req_out = (struct sctp_stream_reset_out_request *)ph; 4122 num_req++; 4123 if (stcb->asoc.stream_reset_outstanding) { 4124 seq = ntohl(req_out->response_seq); 4125 if (seq == stcb->asoc.str_reset_seq_out) { 4126 /* implicit ack */ 4127 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 4128 } 4129 } 4130 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4131 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4132 struct sctp_stream_reset_add_strm *str_add; 4133 4134 str_add = (struct sctp_stream_reset_add_strm *)ph; 4135 num_req++; 4136 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4137 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4138 struct sctp_stream_reset_add_strm *str_add; 4139 4140 str_add = (struct sctp_stream_reset_add_strm *)ph; 4141 num_req++; 4142 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4143 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4144 struct sctp_stream_reset_in_request *req_in; 4145 4146 num_req++; 4147 req_in = (struct sctp_stream_reset_in_request *)ph; 4148 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4149 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4150 struct sctp_stream_reset_tsn_request *req_tsn; 4151 4152 num_req++; 4153 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4154 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4155 ret_code = 1; 4156 goto strres_nochunk; 4157 } 4158 /* no more */ 4159 break; 4160 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4161 struct sctp_stream_reset_response *resp; 4162 uint32_t result; 4163 4164 resp = (struct sctp_stream_reset_response *)ph; 4165 seq = ntohl(resp->response_seq); 4166 result = ntohl(resp->result); 4167 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4168 ret_code = 1; 4169 goto strres_nochunk; 4170 } 4171 } else { 4172 break; 4173 } 4174 offset += SCTP_SIZE32(param_len); 4175 chk_length -= SCTP_SIZE32(param_len); 4176 } 4177 if (num_req == 0) { 4178 /* we have no response free the stuff */ 4179 goto strres_nochunk; 4180 } 4181 /* ok we have a chunk to link in */ 4182 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4183 chk, 4184 sctp_next); 4185 stcb->asoc.ctrl_queue_cnt++; 4186 return (ret_code); 4187 } 4188 4189 /* 4190 * Handle a router or endpoints report of a packet loss, there are two ways 4191 * to handle this, either we get the whole packet and must disect it 4192 * ourselves (possibly with truncation and or corruption) or it is a summary 4193 * from a middle box that did the disectting for us. 4194 */ 4195 static void 4196 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4197 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4198 { 4199 uint32_t bottle_bw, on_queue; 4200 uint16_t trunc_len; 4201 unsigned int chlen; 4202 unsigned int at; 4203 struct sctp_chunk_desc desc; 4204 struct sctp_chunkhdr *ch; 4205 4206 chlen = ntohs(cp->ch.chunk_length); 4207 chlen -= sizeof(struct sctp_pktdrop_chunk); 4208 /* XXX possible chlen underflow */ 4209 if (chlen == 0) { 4210 ch = NULL; 4211 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4212 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4213 } else { 4214 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4215 chlen -= sizeof(struct sctphdr); 4216 /* XXX possible chlen underflow */ 4217 memset(&desc, 0, sizeof(desc)); 4218 } 4219 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4220 if (trunc_len > limit) { 4221 trunc_len = limit; 4222 } 4223 /* now the chunks themselves */ 4224 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4225 desc.chunk_type = ch->chunk_type; 4226 /* get amount we need to move */ 4227 at = ntohs(ch->chunk_length); 4228 if (at < sizeof(struct sctp_chunkhdr)) { 4229 /* corrupt chunk, maybe at the end? */ 4230 SCTP_STAT_INCR(sctps_pdrpcrupt); 4231 break; 4232 } 4233 if (trunc_len == 0) { 4234 /* we are supposed to have all of it */ 4235 if (at > chlen) { 4236 /* corrupt skip it */ 4237 SCTP_STAT_INCR(sctps_pdrpcrupt); 4238 break; 4239 } 4240 } else { 4241 /* is there enough of it left ? */ 4242 if (desc.chunk_type == SCTP_DATA) { 4243 if (chlen < (sizeof(struct sctp_data_chunk) + 4244 sizeof(desc.data_bytes))) { 4245 break; 4246 } 4247 } else { 4248 if (chlen < sizeof(struct sctp_chunkhdr)) { 4249 break; 4250 } 4251 } 4252 } 4253 if (desc.chunk_type == SCTP_DATA) { 4254 /* can we get out the tsn? */ 4255 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4256 SCTP_STAT_INCR(sctps_pdrpmbda); 4257 4258 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4259 /* yep */ 4260 struct sctp_data_chunk *dcp; 4261 uint8_t *ddp; 4262 unsigned int iii; 4263 4264 dcp = (struct sctp_data_chunk *)ch; 4265 ddp = (uint8_t *) (dcp + 1); 4266 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4267 desc.data_bytes[iii] = ddp[iii]; 4268 } 4269 desc.tsn_ifany = dcp->dp.tsn; 4270 } else { 4271 /* nope we are done. */ 4272 SCTP_STAT_INCR(sctps_pdrpnedat); 4273 break; 4274 } 4275 } else { 4276 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4277 SCTP_STAT_INCR(sctps_pdrpmbct); 4278 } 4279 4280 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4281 SCTP_STAT_INCR(sctps_pdrppdbrk); 4282 break; 4283 } 4284 if (SCTP_SIZE32(at) > chlen) { 4285 break; 4286 } 4287 chlen -= SCTP_SIZE32(at); 4288 if (chlen < sizeof(struct sctp_chunkhdr)) { 4289 /* done, none left */ 4290 break; 4291 } 4292 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4293 } 4294 /* Now update any rwnd --- possibly */ 4295 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4296 /* From a peer, we get a rwnd report */ 4297 uint32_t a_rwnd; 4298 4299 SCTP_STAT_INCR(sctps_pdrpfehos); 4300 4301 bottle_bw = ntohl(cp->bottle_bw); 4302 on_queue = ntohl(cp->current_onq); 4303 if (bottle_bw && on_queue) { 4304 /* a rwnd report is in here */ 4305 if (bottle_bw > on_queue) 4306 a_rwnd = bottle_bw - on_queue; 4307 else 4308 a_rwnd = 0; 4309 4310 if (a_rwnd == 0) 4311 stcb->asoc.peers_rwnd = 0; 4312 else { 4313 if (a_rwnd > stcb->asoc.total_flight) { 4314 stcb->asoc.peers_rwnd = 4315 a_rwnd - stcb->asoc.total_flight; 4316 } else { 4317 stcb->asoc.peers_rwnd = 0; 4318 } 4319 if (stcb->asoc.peers_rwnd < 4320 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4321 /* SWS sender side engages */ 4322 stcb->asoc.peers_rwnd = 0; 4323 } 4324 } 4325 } 4326 } else { 4327 SCTP_STAT_INCR(sctps_pdrpfmbox); 4328 } 4329 4330 /* now middle boxes in sat networks get a cwnd bump */ 4331 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4332 (stcb->asoc.sat_t3_loss_recovery == 0) && 4333 (stcb->asoc.sat_network)) { 4334 /* 4335 * This is debateable but for sat networks it makes sense 4336 * Note if a T3 timer has went off, we will prohibit any 4337 * changes to cwnd until we exit the t3 loss recovery. 4338 */ 4339 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4340 net, cp, &bottle_bw, &on_queue); 4341 } 4342 } 4343 4344 /* 4345 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4346 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4347 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4348 * length of the complete packet outputs: - length: modified to remaining 4349 * length after control processing - netp: modified to new sctp_nets after 4350 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4351 * bad packet,...) otherwise return the tcb for this packet 4352 */ 4353 #ifdef __GNUC__ 4354 __attribute__((noinline)) 4355 #endif 4356 static struct sctp_tcb * 4357 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4358 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4359 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4360 uint32_t vrf_id, uint16_t port) 4361 { 4362 struct sctp_association *asoc; 4363 uint32_t vtag_in; 4364 int num_chunks = 0; /* number of control chunks processed */ 4365 uint32_t chk_length; 4366 int ret; 4367 int abort_no_unlock = 0; 4368 int ecne_seen = 0; 4369 4370 /* 4371 * How big should this be, and should it be alloc'd? Lets try the 4372 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4373 * until we get into jumbo grams and such.. 4374 */ 4375 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4376 struct sctp_tcb *locked_tcb = stcb; 4377 int got_auth = 0; 4378 uint32_t auth_offset = 0, auth_len = 0; 4379 int auth_skipped = 0; 4380 int asconf_cnt = 0; 4381 4382 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4383 struct socket *so; 4384 4385 #endif 4386 4387 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4388 iphlen, *offset, length, stcb); 4389 4390 /* validate chunk header length... */ 4391 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4392 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4393 ntohs(ch->chunk_length)); 4394 if (locked_tcb) { 4395 SCTP_TCB_UNLOCK(locked_tcb); 4396 } 4397 return (NULL); 4398 } 4399 /* 4400 * validate the verification tag 4401 */ 4402 vtag_in = ntohl(sh->v_tag); 4403 4404 if (locked_tcb) { 4405 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4406 } 4407 if (ch->chunk_type == SCTP_INITIATION) { 4408 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4409 ntohs(ch->chunk_length), vtag_in); 4410 if (vtag_in != 0) { 4411 /* protocol error- silently discard... */ 4412 SCTP_STAT_INCR(sctps_badvtag); 4413 if (locked_tcb) { 4414 SCTP_TCB_UNLOCK(locked_tcb); 4415 } 4416 return (NULL); 4417 } 4418 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4419 /* 4420 * If there is no stcb, skip the AUTH chunk and process 4421 * later after a stcb is found (to validate the lookup was 4422 * valid. 4423 */ 4424 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4425 (stcb == NULL) && 4426 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4427 /* save this chunk for later processing */ 4428 auth_skipped = 1; 4429 auth_offset = *offset; 4430 auth_len = ntohs(ch->chunk_length); 4431 4432 /* (temporarily) move past this chunk */ 4433 *offset += SCTP_SIZE32(auth_len); 4434 if (*offset >= length) { 4435 /* no more data left in the mbuf chain */ 4436 *offset = length; 4437 if (locked_tcb) { 4438 SCTP_TCB_UNLOCK(locked_tcb); 4439 } 4440 return (NULL); 4441 } 4442 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4443 sizeof(struct sctp_chunkhdr), chunk_buf); 4444 } 4445 if (ch == NULL) { 4446 /* Help */ 4447 *offset = length; 4448 if (locked_tcb) { 4449 SCTP_TCB_UNLOCK(locked_tcb); 4450 } 4451 return (NULL); 4452 } 4453 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4454 goto process_control_chunks; 4455 } 4456 /* 4457 * first check if it's an ASCONF with an unknown src addr we 4458 * need to look inside to find the association 4459 */ 4460 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4461 struct sctp_chunkhdr *asconf_ch = ch; 4462 uint32_t asconf_offset = 0, asconf_len = 0; 4463 4464 /* inp's refcount may be reduced */ 4465 SCTP_INP_INCR_REF(inp); 4466 4467 asconf_offset = *offset; 4468 do { 4469 asconf_len = ntohs(asconf_ch->chunk_length); 4470 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4471 break; 4472 stcb = sctp_findassociation_ep_asconf(m, 4473 *offset, sh, &inp, netp, vrf_id); 4474 if (stcb != NULL) 4475 break; 4476 asconf_offset += SCTP_SIZE32(asconf_len); 4477 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4478 sizeof(struct sctp_chunkhdr), chunk_buf); 4479 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4480 if (stcb == NULL) { 4481 /* 4482 * reduce inp's refcount if not reduced in 4483 * sctp_findassociation_ep_asconf(). 4484 */ 4485 SCTP_INP_DECR_REF(inp); 4486 } else { 4487 locked_tcb = stcb; 4488 } 4489 4490 /* now go back and verify any auth chunk to be sure */ 4491 if (auth_skipped && (stcb != NULL)) { 4492 struct sctp_auth_chunk *auth; 4493 4494 auth = (struct sctp_auth_chunk *) 4495 sctp_m_getptr(m, auth_offset, 4496 auth_len, chunk_buf); 4497 got_auth = 1; 4498 auth_skipped = 0; 4499 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4500 auth_offset)) { 4501 /* auth HMAC failed so dump it */ 4502 *offset = length; 4503 if (locked_tcb) { 4504 SCTP_TCB_UNLOCK(locked_tcb); 4505 } 4506 return (NULL); 4507 } else { 4508 /* remaining chunks are HMAC checked */ 4509 stcb->asoc.authenticated = 1; 4510 } 4511 } 4512 } 4513 if (stcb == NULL) { 4514 /* no association, so it's out of the blue... */ 4515 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4516 vrf_id, port); 4517 *offset = length; 4518 if (locked_tcb) { 4519 SCTP_TCB_UNLOCK(locked_tcb); 4520 } 4521 return (NULL); 4522 } 4523 asoc = &stcb->asoc; 4524 /* ABORT and SHUTDOWN can use either v_tag... */ 4525 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4526 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4527 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4528 if ((vtag_in == asoc->my_vtag) || 4529 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4530 (vtag_in == asoc->peer_vtag))) { 4531 /* this is valid */ 4532 } else { 4533 /* drop this packet... */ 4534 SCTP_STAT_INCR(sctps_badvtag); 4535 if (locked_tcb) { 4536 SCTP_TCB_UNLOCK(locked_tcb); 4537 } 4538 return (NULL); 4539 } 4540 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4541 if (vtag_in != asoc->my_vtag) { 4542 /* 4543 * this could be a stale SHUTDOWN-ACK or the 4544 * peer never got the SHUTDOWN-COMPLETE and 4545 * is still hung; we have started a new asoc 4546 * but it won't complete until the shutdown 4547 * is completed 4548 */ 4549 if (locked_tcb) { 4550 SCTP_TCB_UNLOCK(locked_tcb); 4551 } 4552 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4553 NULL, vrf_id, port); 4554 return (NULL); 4555 } 4556 } else { 4557 /* for all other chunks, vtag must match */ 4558 if (vtag_in != asoc->my_vtag) { 4559 /* invalid vtag... */ 4560 SCTPDBG(SCTP_DEBUG_INPUT3, 4561 "invalid vtag: %xh, expect %xh\n", 4562 vtag_in, asoc->my_vtag); 4563 SCTP_STAT_INCR(sctps_badvtag); 4564 if (locked_tcb) { 4565 SCTP_TCB_UNLOCK(locked_tcb); 4566 } 4567 *offset = length; 4568 return (NULL); 4569 } 4570 } 4571 } /* end if !SCTP_COOKIE_ECHO */ 4572 /* 4573 * process all control chunks... 4574 */ 4575 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4576 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4577 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4578 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4579 /* implied cookie-ack.. we must have lost the ack */ 4580 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4581 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4582 stcb->asoc.overall_error_count, 4583 0, 4584 SCTP_FROM_SCTP_INPUT, 4585 __LINE__); 4586 } 4587 stcb->asoc.overall_error_count = 0; 4588 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4589 *netp); 4590 } 4591 process_control_chunks: 4592 while (IS_SCTP_CONTROL(ch)) { 4593 /* validate chunk length */ 4594 chk_length = ntohs(ch->chunk_length); 4595 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4596 ch->chunk_type, chk_length); 4597 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4598 if (chk_length < sizeof(*ch) || 4599 (*offset + (int)chk_length) > length) { 4600 *offset = length; 4601 if (locked_tcb) { 4602 SCTP_TCB_UNLOCK(locked_tcb); 4603 } 4604 return (NULL); 4605 } 4606 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4607 /* 4608 * INIT-ACK only gets the init ack "header" portion only 4609 * because we don't have to process the peer's COOKIE. All 4610 * others get a complete chunk. 4611 */ 4612 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4613 (ch->chunk_type == SCTP_INITIATION)) { 4614 /* get an init-ack chunk */ 4615 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4616 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4617 if (ch == NULL) { 4618 *offset = length; 4619 if (locked_tcb) { 4620 SCTP_TCB_UNLOCK(locked_tcb); 4621 } 4622 return (NULL); 4623 } 4624 } else { 4625 /* For cookies and all other chunks. */ 4626 if (chk_length > sizeof(chunk_buf)) { 4627 /* 4628 * use just the size of the chunk buffer so 4629 * the front part of our chunks fit in 4630 * contiguous space up to the chunk buffer 4631 * size (508 bytes). For chunks that need to 4632 * get more than that they must use the 4633 * sctp_m_getptr() function or other means 4634 * (e.g. know how to parse mbuf chains). 4635 * Cookies do this already. 4636 */ 4637 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4638 (sizeof(chunk_buf) - 4), 4639 chunk_buf); 4640 if (ch == NULL) { 4641 *offset = length; 4642 if (locked_tcb) { 4643 SCTP_TCB_UNLOCK(locked_tcb); 4644 } 4645 return (NULL); 4646 } 4647 } else { 4648 /* We can fit it all */ 4649 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4650 chk_length, chunk_buf); 4651 if (ch == NULL) { 4652 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4653 *offset = length; 4654 if (locked_tcb) { 4655 SCTP_TCB_UNLOCK(locked_tcb); 4656 } 4657 return (NULL); 4658 } 4659 } 4660 } 4661 num_chunks++; 4662 /* Save off the last place we got a control from */ 4663 if (stcb != NULL) { 4664 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4665 /* 4666 * allow last_control to be NULL if 4667 * ASCONF... ASCONF processing will find the 4668 * right net later 4669 */ 4670 if ((netp != NULL) && (*netp != NULL)) 4671 stcb->asoc.last_control_chunk_from = *netp; 4672 } 4673 } 4674 #ifdef SCTP_AUDITING_ENABLED 4675 sctp_audit_log(0xB0, ch->chunk_type); 4676 #endif 4677 4678 /* check to see if this chunk required auth, but isn't */ 4679 if ((stcb != NULL) && 4680 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4681 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4682 !stcb->asoc.authenticated) { 4683 /* "silently" ignore */ 4684 SCTP_STAT_INCR(sctps_recvauthmissing); 4685 goto next_chunk; 4686 } 4687 switch (ch->chunk_type) { 4688 case SCTP_INITIATION: 4689 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4690 /* The INIT chunk must be the only chunk. */ 4691 if ((num_chunks > 1) || 4692 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4693 sctp_abort_association(inp, stcb, m, 4694 iphlen, sh, NULL, vrf_id, port); 4695 *offset = length; 4696 return (NULL); 4697 } 4698 /* Honor our resource limit. */ 4699 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4700 struct mbuf *op_err; 4701 4702 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4703 sctp_abort_association(inp, stcb, m, 4704 iphlen, sh, op_err, vrf_id, port); 4705 *offset = length; 4706 return (NULL); 4707 } 4708 sctp_handle_init(m, iphlen, *offset, sh, 4709 (struct sctp_init_chunk *)ch, inp, 4710 stcb, &abort_no_unlock, vrf_id, port); 4711 *offset = length; 4712 if ((!abort_no_unlock) && (locked_tcb)) { 4713 SCTP_TCB_UNLOCK(locked_tcb); 4714 } 4715 return (NULL); 4716 break; 4717 case SCTP_PAD_CHUNK: 4718 break; 4719 case SCTP_INITIATION_ACK: 4720 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4721 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4722 /* We are not interested anymore */ 4723 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4724 ; 4725 } else { 4726 if (locked_tcb != stcb) { 4727 /* Very unlikely */ 4728 SCTP_TCB_UNLOCK(locked_tcb); 4729 } 4730 *offset = length; 4731 if (stcb) { 4732 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4733 so = SCTP_INP_SO(inp); 4734 atomic_add_int(&stcb->asoc.refcnt, 1); 4735 SCTP_TCB_UNLOCK(stcb); 4736 SCTP_SOCKET_LOCK(so, 1); 4737 SCTP_TCB_LOCK(stcb); 4738 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4739 #endif 4740 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4741 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4742 SCTP_SOCKET_UNLOCK(so, 1); 4743 #endif 4744 } 4745 return (NULL); 4746 } 4747 } 4748 /* The INIT-ACK chunk must be the only chunk. */ 4749 if ((num_chunks > 1) || 4750 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4751 *offset = length; 4752 if (locked_tcb) { 4753 SCTP_TCB_UNLOCK(locked_tcb); 4754 } 4755 return (NULL); 4756 } 4757 if ((netp) && (*netp)) { 4758 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4759 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4760 } else { 4761 ret = -1; 4762 } 4763 *offset = length; 4764 if (abort_no_unlock) { 4765 return (NULL); 4766 } 4767 /* 4768 * Special case, I must call the output routine to 4769 * get the cookie echoed 4770 */ 4771 if ((stcb != NULL) && (ret == 0)) { 4772 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4773 } 4774 if (locked_tcb) { 4775 SCTP_TCB_UNLOCK(locked_tcb); 4776 } 4777 return (NULL); 4778 break; 4779 case SCTP_SELECTIVE_ACK: 4780 { 4781 struct sctp_sack_chunk *sack; 4782 int abort_now = 0; 4783 uint32_t a_rwnd, cum_ack; 4784 uint16_t num_seg, num_dup; 4785 uint8_t flags; 4786 int offset_seg, offset_dup; 4787 4788 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4789 SCTP_STAT_INCR(sctps_recvsacks); 4790 if (stcb == NULL) { 4791 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4792 break; 4793 } 4794 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4795 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4796 break; 4797 } 4798 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4799 /*- 4800 * If we have sent a shutdown-ack, we will pay no 4801 * attention to a sack sent in to us since 4802 * we don't care anymore. 4803 */ 4804 break; 4805 } 4806 sack = (struct sctp_sack_chunk *)ch; 4807 flags = ch->chunk_flags; 4808 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4809 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4810 num_dup = ntohs(sack->sack.num_dup_tsns); 4811 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4812 if (sizeof(struct sctp_sack_chunk) + 4813 num_seg * sizeof(struct sctp_gap_ack_block) + 4814 num_dup * sizeof(uint32_t) != chk_length) { 4815 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4816 break; 4817 } 4818 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4819 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4820 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4821 cum_ack, num_seg, a_rwnd); 4822 stcb->asoc.seen_a_sack_this_pkt = 1; 4823 if ((stcb->asoc.pr_sctp_cnt == 0) && 4824 (num_seg == 0) && 4825 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4826 (stcb->asoc.saw_sack_with_frags == 0) && 4827 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4828 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4829 ) { 4830 /* 4831 * We have a SIMPLE sack having no 4832 * prior segments and data on sent 4833 * queue to be acked.. Use the 4834 * faster path sack processing. We 4835 * also allow window update sacks 4836 * with no missing segments to go 4837 * this way too. 4838 */ 4839 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4840 } else { 4841 if (netp && *netp) 4842 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4843 num_seg, 0, num_dup, &abort_now, flags, 4844 cum_ack, a_rwnd, ecne_seen); 4845 } 4846 if (abort_now) { 4847 /* ABORT signal from sack processing */ 4848 *offset = length; 4849 return (NULL); 4850 } 4851 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4852 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4853 (stcb->asoc.stream_queue_cnt == 0)) { 4854 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4855 } 4856 } 4857 break; 4858 /* 4859 * EY - nr_sack: If the received chunk is an 4860 * nr_sack chunk 4861 */ 4862 case SCTP_NR_SELECTIVE_ACK: 4863 { 4864 struct sctp_nr_sack_chunk *nr_sack; 4865 int abort_now = 0; 4866 uint32_t a_rwnd, cum_ack; 4867 uint16_t num_seg, num_nr_seg, num_dup; 4868 uint8_t flags; 4869 int offset_seg, offset_dup; 4870 4871 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4872 SCTP_STAT_INCR(sctps_recvsacks); 4873 if (stcb == NULL) { 4874 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4875 break; 4876 } 4877 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4878 (stcb->asoc.peer_supports_nr_sack == 0)) { 4879 goto unknown_chunk; 4880 } 4881 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4882 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4883 break; 4884 } 4885 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4886 /*- 4887 * If we have sent a shutdown-ack, we will pay no 4888 * attention to a sack sent in to us since 4889 * we don't care anymore. 4890 */ 4891 break; 4892 } 4893 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4894 flags = ch->chunk_flags; 4895 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4896 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4897 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4898 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4899 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4900 if (sizeof(struct sctp_nr_sack_chunk) + 4901 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4902 num_dup * sizeof(uint32_t) != chk_length) { 4903 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4904 break; 4905 } 4906 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4907 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4908 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4909 cum_ack, num_seg, a_rwnd); 4910 stcb->asoc.seen_a_sack_this_pkt = 1; 4911 if ((stcb->asoc.pr_sctp_cnt == 0) && 4912 (num_seg == 0) && (num_nr_seg == 0) && 4913 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4914 (stcb->asoc.saw_sack_with_frags == 0) && 4915 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4916 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4917 /* 4918 * We have a SIMPLE sack having no 4919 * prior segments and data on sent 4920 * queue to be acked. Use the faster 4921 * path sack processing. We also 4922 * allow window update sacks with no 4923 * missing segments to go this way 4924 * too. 4925 */ 4926 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4927 &abort_now, ecne_seen); 4928 } else { 4929 if (netp && *netp) 4930 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4931 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4932 cum_ack, a_rwnd, ecne_seen); 4933 } 4934 if (abort_now) { 4935 /* ABORT signal from sack processing */ 4936 *offset = length; 4937 return (NULL); 4938 } 4939 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4940 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4941 (stcb->asoc.stream_queue_cnt == 0)) { 4942 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4943 } 4944 } 4945 break; 4946 4947 case SCTP_HEARTBEAT_REQUEST: 4948 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4949 if ((stcb) && netp && *netp) { 4950 SCTP_STAT_INCR(sctps_recvheartbeat); 4951 sctp_send_heartbeat_ack(stcb, m, *offset, 4952 chk_length, *netp); 4953 4954 /* He's alive so give him credit */ 4955 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4956 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4957 stcb->asoc.overall_error_count, 4958 0, 4959 SCTP_FROM_SCTP_INPUT, 4960 __LINE__); 4961 } 4962 stcb->asoc.overall_error_count = 0; 4963 } 4964 break; 4965 case SCTP_HEARTBEAT_ACK: 4966 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4967 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4968 /* Its not ours */ 4969 *offset = length; 4970 if (locked_tcb) { 4971 SCTP_TCB_UNLOCK(locked_tcb); 4972 } 4973 return (NULL); 4974 } 4975 /* He's alive so give him credit */ 4976 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4977 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4978 stcb->asoc.overall_error_count, 4979 0, 4980 SCTP_FROM_SCTP_INPUT, 4981 __LINE__); 4982 } 4983 stcb->asoc.overall_error_count = 0; 4984 SCTP_STAT_INCR(sctps_recvheartbeatack); 4985 if (netp && *netp) 4986 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4987 stcb, *netp); 4988 break; 4989 case SCTP_ABORT_ASSOCIATION: 4990 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4991 stcb); 4992 if ((stcb) && netp && *netp) 4993 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4994 stcb, *netp); 4995 *offset = length; 4996 return (NULL); 4997 break; 4998 case SCTP_SHUTDOWN: 4999 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5000 stcb); 5001 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5002 *offset = length; 5003 if (locked_tcb) { 5004 SCTP_TCB_UNLOCK(locked_tcb); 5005 } 5006 return (NULL); 5007 } 5008 if (netp && *netp) { 5009 int abort_flag = 0; 5010 5011 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5012 stcb, *netp, &abort_flag); 5013 if (abort_flag) { 5014 *offset = length; 5015 return (NULL); 5016 } 5017 } 5018 break; 5019 case SCTP_SHUTDOWN_ACK: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5021 if ((stcb) && (netp) && (*netp)) 5022 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5023 *offset = length; 5024 return (NULL); 5025 break; 5026 5027 case SCTP_OPERATION_ERROR: 5028 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5029 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5030 *offset = length; 5031 return (NULL); 5032 } 5033 break; 5034 case SCTP_COOKIE_ECHO: 5035 SCTPDBG(SCTP_DEBUG_INPUT3, 5036 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5037 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5038 ; 5039 } else { 5040 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5041 /* We are not interested anymore */ 5042 abend: 5043 if (stcb) { 5044 SCTP_TCB_UNLOCK(stcb); 5045 } 5046 *offset = length; 5047 return (NULL); 5048 } 5049 } 5050 /* 5051 * First are we accepting? We do this again here 5052 * since it is possible that a previous endpoint WAS 5053 * listening responded to a INIT-ACK and then 5054 * closed. We opened and bound.. and are now no 5055 * longer listening. 5056 */ 5057 5058 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5059 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5060 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5061 struct mbuf *op_err; 5062 5063 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5064 sctp_abort_association(inp, stcb, m, 5065 iphlen, sh, op_err, vrf_id, port); 5066 } 5067 *offset = length; 5068 return (NULL); 5069 } else { 5070 struct mbuf *ret_buf; 5071 struct sctp_inpcb *linp; 5072 5073 if (stcb) { 5074 linp = NULL; 5075 } else { 5076 linp = inp; 5077 } 5078 5079 if (linp) { 5080 SCTP_ASOC_CREATE_LOCK(linp); 5081 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5082 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5083 SCTP_ASOC_CREATE_UNLOCK(linp); 5084 goto abend; 5085 } 5086 } 5087 if (netp) { 5088 ret_buf = 5089 sctp_handle_cookie_echo(m, iphlen, 5090 *offset, sh, 5091 (struct sctp_cookie_echo_chunk *)ch, 5092 &inp, &stcb, netp, 5093 auth_skipped, 5094 auth_offset, 5095 auth_len, 5096 &locked_tcb, 5097 vrf_id, 5098 port); 5099 } else { 5100 ret_buf = NULL; 5101 } 5102 if (linp) { 5103 SCTP_ASOC_CREATE_UNLOCK(linp); 5104 } 5105 if (ret_buf == NULL) { 5106 if (locked_tcb) { 5107 SCTP_TCB_UNLOCK(locked_tcb); 5108 } 5109 SCTPDBG(SCTP_DEBUG_INPUT3, 5110 "GAK, null buffer\n"); 5111 *offset = length; 5112 return (NULL); 5113 } 5114 /* if AUTH skipped, see if it verified... */ 5115 if (auth_skipped) { 5116 got_auth = 1; 5117 auth_skipped = 0; 5118 } 5119 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5120 /* 5121 * Restart the timer if we have 5122 * pending data 5123 */ 5124 struct sctp_tmit_chunk *chk; 5125 5126 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5127 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5128 } 5129 } 5130 break; 5131 case SCTP_COOKIE_ACK: 5132 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5133 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5134 if (locked_tcb) { 5135 SCTP_TCB_UNLOCK(locked_tcb); 5136 } 5137 return (NULL); 5138 } 5139 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5140 /* We are not interested anymore */ 5141 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5142 ; 5143 } else if (stcb) { 5144 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5145 so = SCTP_INP_SO(inp); 5146 atomic_add_int(&stcb->asoc.refcnt, 1); 5147 SCTP_TCB_UNLOCK(stcb); 5148 SCTP_SOCKET_LOCK(so, 1); 5149 SCTP_TCB_LOCK(stcb); 5150 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5151 #endif 5152 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5153 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5154 SCTP_SOCKET_UNLOCK(so, 1); 5155 #endif 5156 *offset = length; 5157 return (NULL); 5158 } 5159 } 5160 /* He's alive so give him credit */ 5161 if ((stcb) && netp && *netp) { 5162 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5163 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5164 stcb->asoc.overall_error_count, 5165 0, 5166 SCTP_FROM_SCTP_INPUT, 5167 __LINE__); 5168 } 5169 stcb->asoc.overall_error_count = 0; 5170 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5171 } 5172 break; 5173 case SCTP_ECN_ECHO: 5174 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5175 /* He's alive so give him credit */ 5176 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5177 /* Its not ours */ 5178 if (locked_tcb) { 5179 SCTP_TCB_UNLOCK(locked_tcb); 5180 } 5181 *offset = length; 5182 return (NULL); 5183 } 5184 if (stcb) { 5185 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5186 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5187 stcb->asoc.overall_error_count, 5188 0, 5189 SCTP_FROM_SCTP_INPUT, 5190 __LINE__); 5191 } 5192 stcb->asoc.overall_error_count = 0; 5193 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5194 stcb); 5195 ecne_seen = 1; 5196 } 5197 break; 5198 case SCTP_ECN_CWR: 5199 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5200 /* He's alive so give him credit */ 5201 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5202 /* Its not ours */ 5203 if (locked_tcb) { 5204 SCTP_TCB_UNLOCK(locked_tcb); 5205 } 5206 *offset = length; 5207 return (NULL); 5208 } 5209 if (stcb) { 5210 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5211 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5212 stcb->asoc.overall_error_count, 5213 0, 5214 SCTP_FROM_SCTP_INPUT, 5215 __LINE__); 5216 } 5217 stcb->asoc.overall_error_count = 0; 5218 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5219 } 5220 break; 5221 case SCTP_SHUTDOWN_COMPLETE: 5222 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5223 /* must be first and only chunk */ 5224 if ((num_chunks > 1) || 5225 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5226 *offset = length; 5227 if (locked_tcb) { 5228 SCTP_TCB_UNLOCK(locked_tcb); 5229 } 5230 return (NULL); 5231 } 5232 if ((stcb) && netp && *netp) { 5233 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5234 stcb, *netp); 5235 } 5236 *offset = length; 5237 return (NULL); 5238 break; 5239 case SCTP_ASCONF: 5240 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5241 /* He's alive so give him credit */ 5242 if (stcb) { 5243 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5244 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5245 stcb->asoc.overall_error_count, 5246 0, 5247 SCTP_FROM_SCTP_INPUT, 5248 __LINE__); 5249 } 5250 stcb->asoc.overall_error_count = 0; 5251 sctp_handle_asconf(m, *offset, 5252 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5253 asconf_cnt++; 5254 } 5255 break; 5256 case SCTP_ASCONF_ACK: 5257 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5258 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5259 /* Its not ours */ 5260 if (locked_tcb) { 5261 SCTP_TCB_UNLOCK(locked_tcb); 5262 } 5263 *offset = length; 5264 return (NULL); 5265 } 5266 if ((stcb) && netp && *netp) { 5267 /* He's alive so give him credit */ 5268 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5269 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5270 stcb->asoc.overall_error_count, 5271 0, 5272 SCTP_FROM_SCTP_INPUT, 5273 __LINE__); 5274 } 5275 stcb->asoc.overall_error_count = 0; 5276 sctp_handle_asconf_ack(m, *offset, 5277 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5278 if (abort_no_unlock) 5279 return (NULL); 5280 } 5281 break; 5282 case SCTP_FORWARD_CUM_TSN: 5283 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5284 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5285 /* Its not ours */ 5286 if (locked_tcb) { 5287 SCTP_TCB_UNLOCK(locked_tcb); 5288 } 5289 *offset = length; 5290 return (NULL); 5291 } 5292 /* He's alive so give him credit */ 5293 if (stcb) { 5294 int abort_flag = 0; 5295 5296 stcb->asoc.overall_error_count = 0; 5297 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5298 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5299 stcb->asoc.overall_error_count, 5300 0, 5301 SCTP_FROM_SCTP_INPUT, 5302 __LINE__); 5303 } 5304 *fwd_tsn_seen = 1; 5305 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5306 /* We are not interested anymore */ 5307 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5308 so = SCTP_INP_SO(inp); 5309 atomic_add_int(&stcb->asoc.refcnt, 1); 5310 SCTP_TCB_UNLOCK(stcb); 5311 SCTP_SOCKET_LOCK(so, 1); 5312 SCTP_TCB_LOCK(stcb); 5313 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5314 #endif 5315 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5316 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5317 SCTP_SOCKET_UNLOCK(so, 1); 5318 #endif 5319 *offset = length; 5320 return (NULL); 5321 } 5322 sctp_handle_forward_tsn(stcb, 5323 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5324 if (abort_flag) { 5325 *offset = length; 5326 return (NULL); 5327 } else { 5328 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5329 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5330 stcb->asoc.overall_error_count, 5331 0, 5332 SCTP_FROM_SCTP_INPUT, 5333 __LINE__); 5334 } 5335 stcb->asoc.overall_error_count = 0; 5336 } 5337 5338 } 5339 break; 5340 case SCTP_STREAM_RESET: 5341 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5342 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5343 /* Its not ours */ 5344 if (locked_tcb) { 5345 SCTP_TCB_UNLOCK(locked_tcb); 5346 } 5347 *offset = length; 5348 return (NULL); 5349 } 5350 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5351 /* We are not interested anymore */ 5352 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5353 so = SCTP_INP_SO(inp); 5354 atomic_add_int(&stcb->asoc.refcnt, 1); 5355 SCTP_TCB_UNLOCK(stcb); 5356 SCTP_SOCKET_LOCK(so, 1); 5357 SCTP_TCB_LOCK(stcb); 5358 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5359 #endif 5360 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5361 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5362 SCTP_SOCKET_UNLOCK(so, 1); 5363 #endif 5364 *offset = length; 5365 return (NULL); 5366 } 5367 if (stcb->asoc.peer_supports_strreset == 0) { 5368 /* 5369 * hmm, peer should have announced this, but 5370 * we will turn it on since he is sending us 5371 * a stream reset. 5372 */ 5373 stcb->asoc.peer_supports_strreset = 1; 5374 } 5375 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5376 /* stop processing */ 5377 *offset = length; 5378 return (NULL); 5379 } 5380 break; 5381 case SCTP_PACKET_DROPPED: 5382 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5383 /* re-get it all please */ 5384 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5385 /* Its not ours */ 5386 if (locked_tcb) { 5387 SCTP_TCB_UNLOCK(locked_tcb); 5388 } 5389 *offset = length; 5390 return (NULL); 5391 } 5392 if (ch && (stcb) && netp && (*netp)) { 5393 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5394 stcb, *netp, 5395 min(chk_length, (sizeof(chunk_buf) - 4))); 5396 5397 } 5398 break; 5399 5400 case SCTP_AUTHENTICATION: 5401 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5402 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5403 goto unknown_chunk; 5404 5405 if (stcb == NULL) { 5406 /* save the first AUTH for later processing */ 5407 if (auth_skipped == 0) { 5408 auth_offset = *offset; 5409 auth_len = chk_length; 5410 auth_skipped = 1; 5411 } 5412 /* skip this chunk (temporarily) */ 5413 goto next_chunk; 5414 } 5415 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5416 (chk_length > (sizeof(struct sctp_auth_chunk) + 5417 SCTP_AUTH_DIGEST_LEN_MAX))) { 5418 /* Its not ours */ 5419 if (locked_tcb) { 5420 SCTP_TCB_UNLOCK(locked_tcb); 5421 } 5422 *offset = length; 5423 return (NULL); 5424 } 5425 if (got_auth == 1) { 5426 /* skip this chunk... it's already auth'd */ 5427 goto next_chunk; 5428 } 5429 got_auth = 1; 5430 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5431 m, *offset)) { 5432 /* auth HMAC failed so dump the packet */ 5433 *offset = length; 5434 return (stcb); 5435 } else { 5436 /* remaining chunks are HMAC checked */ 5437 stcb->asoc.authenticated = 1; 5438 } 5439 break; 5440 5441 default: 5442 unknown_chunk: 5443 /* it's an unknown chunk! */ 5444 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5445 struct mbuf *mm; 5446 struct sctp_paramhdr *phd; 5447 5448 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5449 0, M_DONTWAIT, 1, MT_DATA); 5450 if (mm) { 5451 phd = mtod(mm, struct sctp_paramhdr *); 5452 /* 5453 * We cheat and use param type since 5454 * we did not bother to define a 5455 * error cause struct. They are the 5456 * same basic format with different 5457 * names. 5458 */ 5459 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5460 phd->param_length = htons(chk_length + sizeof(*phd)); 5461 SCTP_BUF_LEN(mm) = sizeof(*phd); 5462 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5463 if (SCTP_BUF_NEXT(mm)) { 5464 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5465 sctp_m_freem(mm); 5466 } else { 5467 #ifdef SCTP_MBUF_LOGGING 5468 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5469 struct mbuf *mat; 5470 5471 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5472 if (SCTP_BUF_IS_EXTENDED(mat)) { 5473 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5474 } 5475 } 5476 } 5477 #endif 5478 sctp_queue_op_err(stcb, mm); 5479 } 5480 } else { 5481 sctp_m_freem(mm); 5482 } 5483 } 5484 } 5485 if ((ch->chunk_type & 0x80) == 0) { 5486 /* discard this packet */ 5487 *offset = length; 5488 return (stcb); 5489 } /* else skip this bad chunk and continue... */ 5490 break; 5491 } /* switch (ch->chunk_type) */ 5492 5493 5494 next_chunk: 5495 /* get the next chunk */ 5496 *offset += SCTP_SIZE32(chk_length); 5497 if (*offset >= length) { 5498 /* no more data left in the mbuf chain */ 5499 break; 5500 } 5501 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5502 sizeof(struct sctp_chunkhdr), chunk_buf); 5503 if (ch == NULL) { 5504 if (locked_tcb) { 5505 SCTP_TCB_UNLOCK(locked_tcb); 5506 } 5507 *offset = length; 5508 return (NULL); 5509 } 5510 } /* while */ 5511 5512 if (asconf_cnt > 0 && stcb != NULL) { 5513 sctp_send_asconf_ack(stcb); 5514 } 5515 return (stcb); 5516 } 5517 5518 5519 #ifdef INVARIANTS 5520 #ifdef __GNUC__ 5521 __attribute__((noinline)) 5522 #endif 5523 void 5524 sctp_validate_no_locks(struct sctp_inpcb *inp) 5525 { 5526 struct sctp_tcb *lstcb; 5527 5528 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5529 if (mtx_owned(&lstcb->tcb_mtx)) { 5530 panic("Own lock on stcb at return from input"); 5531 } 5532 } 5533 if (mtx_owned(&inp->inp_create_mtx)) { 5534 panic("Own create lock on inp"); 5535 } 5536 if (mtx_owned(&inp->inp_mtx)) { 5537 panic("Own inp lock on inp"); 5538 } 5539 } 5540 5541 #endif 5542 5543 /* 5544 * common input chunk processing (v4 and v6) 5545 */ 5546 void 5547 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5548 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5549 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5550 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5551 { 5552 /* 5553 * Control chunk processing 5554 */ 5555 uint32_t high_tsn; 5556 int fwd_tsn_seen = 0, data_processed = 0; 5557 struct mbuf *m = *mm; 5558 int un_sent; 5559 int cnt_ctrl_ready = 0; 5560 5561 SCTP_STAT_INCR(sctps_recvdatagrams); 5562 #ifdef SCTP_AUDITING_ENABLED 5563 sctp_audit_log(0xE0, 1); 5564 sctp_auditing(0, inp, stcb, net); 5565 #endif 5566 5567 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5568 m, iphlen, offset, length, stcb); 5569 if (stcb) { 5570 /* always clear this before beginning a packet */ 5571 stcb->asoc.authenticated = 0; 5572 stcb->asoc.seen_a_sack_this_pkt = 0; 5573 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5574 stcb, stcb->asoc.state); 5575 5576 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5577 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5578 /*- 5579 * If we hit here, we had a ref count 5580 * up when the assoc was aborted and the 5581 * timer is clearing out the assoc, we should 5582 * NOT respond to any packet.. its OOTB. 5583 */ 5584 SCTP_TCB_UNLOCK(stcb); 5585 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5586 vrf_id, port); 5587 goto out_now; 5588 } 5589 } 5590 if (IS_SCTP_CONTROL(ch)) { 5591 /* process the control portion of the SCTP packet */ 5592 /* sa_ignore NO_NULL_CHK */ 5593 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5594 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5595 if (stcb) { 5596 /* 5597 * This covers us if the cookie-echo was there and 5598 * it changes our INP. 5599 */ 5600 inp = stcb->sctp_ep; 5601 if ((net) && (port)) { 5602 if (net->port == 0) { 5603 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5604 } 5605 net->port = port; 5606 } 5607 } 5608 } else { 5609 /* 5610 * no control chunks, so pre-process DATA chunks (these 5611 * checks are taken care of by control processing) 5612 */ 5613 5614 /* 5615 * if DATA only packet, and auth is required, then punt... 5616 * can't have authenticated without any AUTH (control) 5617 * chunks 5618 */ 5619 if ((stcb != NULL) && 5620 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5621 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5622 /* "silently" ignore */ 5623 SCTP_STAT_INCR(sctps_recvauthmissing); 5624 SCTP_TCB_UNLOCK(stcb); 5625 goto out_now; 5626 } 5627 if (stcb == NULL) { 5628 /* out of the blue DATA chunk */ 5629 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5630 vrf_id, port); 5631 goto out_now; 5632 } 5633 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5634 /* v_tag mismatch! */ 5635 SCTP_STAT_INCR(sctps_badvtag); 5636 SCTP_TCB_UNLOCK(stcb); 5637 goto out_now; 5638 } 5639 } 5640 5641 if (stcb == NULL) { 5642 /* 5643 * no valid TCB for this packet, or we found it's a bad 5644 * packet while processing control, or we're done with this 5645 * packet (done or skip rest of data), so we drop it... 5646 */ 5647 goto out_now; 5648 } 5649 /* 5650 * DATA chunk processing 5651 */ 5652 /* plow through the data chunks while length > offset */ 5653 5654 /* 5655 * Rest should be DATA only. Check authentication state if AUTH for 5656 * DATA is required. 5657 */ 5658 if ((length > offset) && 5659 (stcb != NULL) && 5660 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5661 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5662 !stcb->asoc.authenticated) { 5663 /* "silently" ignore */ 5664 SCTP_STAT_INCR(sctps_recvauthmissing); 5665 SCTPDBG(SCTP_DEBUG_AUTH1, 5666 "Data chunk requires AUTH, skipped\n"); 5667 goto trigger_send; 5668 } 5669 if (length > offset) { 5670 int retval; 5671 5672 /* 5673 * First check to make sure our state is correct. We would 5674 * not get here unless we really did have a tag, so we don't 5675 * abort if this happens, just dump the chunk silently. 5676 */ 5677 switch (SCTP_GET_STATE(&stcb->asoc)) { 5678 case SCTP_STATE_COOKIE_ECHOED: 5679 /* 5680 * we consider data with valid tags in this state 5681 * shows us the cookie-ack was lost. Imply it was 5682 * there. 5683 */ 5684 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5685 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5686 stcb->asoc.overall_error_count, 5687 0, 5688 SCTP_FROM_SCTP_INPUT, 5689 __LINE__); 5690 } 5691 stcb->asoc.overall_error_count = 0; 5692 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5693 break; 5694 case SCTP_STATE_COOKIE_WAIT: 5695 /* 5696 * We consider OOTB any data sent during asoc setup. 5697 */ 5698 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5699 vrf_id, port); 5700 SCTP_TCB_UNLOCK(stcb); 5701 goto out_now; 5702 /* sa_ignore NOTREACHED */ 5703 break; 5704 case SCTP_STATE_EMPTY: /* should not happen */ 5705 case SCTP_STATE_INUSE: /* should not happen */ 5706 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5707 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5708 default: 5709 SCTP_TCB_UNLOCK(stcb); 5710 goto out_now; 5711 /* sa_ignore NOTREACHED */ 5712 break; 5713 case SCTP_STATE_OPEN: 5714 case SCTP_STATE_SHUTDOWN_SENT: 5715 break; 5716 } 5717 /* plow through the data chunks while length > offset */ 5718 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5719 inp, stcb, net, &high_tsn); 5720 if (retval == 2) { 5721 /* 5722 * The association aborted, NO UNLOCK needed since 5723 * the association is destroyed. 5724 */ 5725 goto out_now; 5726 } 5727 data_processed = 1; 5728 /* 5729 * Anything important needs to have been m_copy'ed in 5730 * process_data 5731 */ 5732 } 5733 /* take care of ecn */ 5734 if ((data_processed == 1) && 5735 (stcb->asoc.ecn_allowed == 1) && 5736 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5737 /* Yep, we need to add a ECNE */ 5738 sctp_send_ecn_echo(stcb, net, high_tsn); 5739 } 5740 if ((data_processed == 0) && (fwd_tsn_seen)) { 5741 int was_a_gap; 5742 uint32_t highest_tsn; 5743 5744 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5745 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5746 } else { 5747 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5748 } 5749 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5750 stcb->asoc.send_sack = 1; 5751 sctp_sack_check(stcb, was_a_gap); 5752 } else if (fwd_tsn_seen) { 5753 stcb->asoc.send_sack = 1; 5754 } 5755 /* trigger send of any chunks in queue... */ 5756 trigger_send: 5757 #ifdef SCTP_AUDITING_ENABLED 5758 sctp_audit_log(0xE0, 2); 5759 sctp_auditing(1, inp, stcb, net); 5760 #endif 5761 SCTPDBG(SCTP_DEBUG_INPUT1, 5762 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5763 stcb->asoc.peers_rwnd, 5764 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5765 stcb->asoc.total_flight); 5766 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5767 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5768 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5769 } 5770 if (cnt_ctrl_ready || 5771 ((un_sent) && 5772 (stcb->asoc.peers_rwnd > 0 || 5773 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5774 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5775 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5776 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5777 } 5778 #ifdef SCTP_AUDITING_ENABLED 5779 sctp_audit_log(0xE0, 3); 5780 sctp_auditing(2, inp, stcb, net); 5781 #endif 5782 SCTP_TCB_UNLOCK(stcb); 5783 out_now: 5784 #ifdef INVARIANTS 5785 sctp_validate_no_locks(inp); 5786 #endif 5787 return; 5788 } 5789 5790 #if 0 5791 static void 5792 sctp_print_mbuf_chain(struct mbuf *m) 5793 { 5794 for (; m; m = SCTP_BUF_NEXT(m)) { 5795 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5796 if (SCTP_BUF_IS_EXTENDED(m)) 5797 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5798 } 5799 } 5800 5801 #endif 5802 5803 #ifdef INET 5804 void 5805 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5806 { 5807 struct mbuf *m; 5808 int iphlen; 5809 uint32_t vrf_id = 0; 5810 uint8_t ecn_bits; 5811 struct ip *ip; 5812 struct sctphdr *sh; 5813 struct sctp_inpcb *inp = NULL; 5814 struct sctp_nets *net; 5815 struct sctp_tcb *stcb = NULL; 5816 struct sctp_chunkhdr *ch; 5817 int refcount_up = 0; 5818 int length, mlen, offset; 5819 5820 #if !defined(SCTP_WITH_NO_CSUM) 5821 uint32_t check, calc_check; 5822 5823 #endif 5824 5825 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5826 SCTP_RELEASE_PKT(i_pak); 5827 return; 5828 } 5829 mlen = SCTP_HEADER_LEN(i_pak); 5830 iphlen = off; 5831 m = SCTP_HEADER_TO_CHAIN(i_pak); 5832 5833 net = NULL; 5834 SCTP_STAT_INCR(sctps_recvpackets); 5835 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5836 5837 5838 #ifdef SCTP_MBUF_LOGGING 5839 /* Log in any input mbufs */ 5840 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5841 struct mbuf *mat; 5842 5843 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5844 if (SCTP_BUF_IS_EXTENDED(mat)) { 5845 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5846 } 5847 } 5848 } 5849 #endif 5850 #ifdef SCTP_PACKET_LOGGING 5851 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5852 sctp_packet_log(m, mlen); 5853 #endif 5854 /* 5855 * Must take out the iphlen, since mlen expects this (only effect lb 5856 * case) 5857 */ 5858 mlen -= iphlen; 5859 5860 /* 5861 * Get IP, SCTP, and first chunk header together in first mbuf. 5862 */ 5863 ip = mtod(m, struct ip *); 5864 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5865 if (SCTP_BUF_LEN(m) < offset) { 5866 if ((m = m_pullup(m, offset)) == 0) { 5867 SCTP_STAT_INCR(sctps_hdrops); 5868 return; 5869 } 5870 ip = mtod(m, struct ip *); 5871 } 5872 /* validate mbuf chain length with IP payload length */ 5873 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5874 SCTP_STAT_INCR(sctps_hdrops); 5875 goto bad; 5876 } 5877 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5878 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5879 SCTPDBG(SCTP_DEBUG_INPUT1, 5880 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5881 5882 /* SCTP does not allow broadcasts or multicasts */ 5883 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5884 goto bad; 5885 } 5886 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5887 /* 5888 * We only look at broadcast if its a front state, All 5889 * others we will not have a tcb for anyway. 5890 */ 5891 goto bad; 5892 } 5893 /* validate SCTP checksum */ 5894 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5895 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5896 m->m_pkthdr.len, 5897 if_name(m->m_pkthdr.rcvif), 5898 m->m_pkthdr.csum_flags); 5899 #if defined(SCTP_WITH_NO_CSUM) 5900 SCTP_STAT_INCR(sctps_recvnocrc); 5901 #else 5902 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5903 SCTP_STAT_INCR(sctps_recvhwcrc); 5904 goto sctp_skip_csum_4; 5905 } 5906 check = sh->checksum; /* save incoming checksum */ 5907 sh->checksum = 0; /* prepare for calc */ 5908 calc_check = sctp_calculate_cksum(m, iphlen); 5909 sh->checksum = check; 5910 SCTP_STAT_INCR(sctps_recvswcrc); 5911 if (calc_check != check) { 5912 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5913 calc_check, check, m, mlen, iphlen); 5914 5915 stcb = sctp_findassociation_addr(m, 5916 offset - sizeof(*ch), 5917 sh, ch, &inp, &net, 5918 vrf_id); 5919 if ((net) && (port)) { 5920 if (net->port == 0) { 5921 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5922 } 5923 net->port = port; 5924 } 5925 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5926 net->flowid = m->m_pkthdr.flowid; 5927 #ifdef INVARIANTS 5928 net->flowidset = 1; 5929 #endif 5930 } 5931 if ((inp) && (stcb)) { 5932 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5933 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5934 } else if ((inp != NULL) && (stcb == NULL)) { 5935 refcount_up = 1; 5936 } 5937 SCTP_STAT_INCR(sctps_badsum); 5938 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5939 goto bad; 5940 } 5941 sctp_skip_csum_4: 5942 #endif 5943 /* destination port of 0 is illegal, based on RFC2960. */ 5944 if (sh->dest_port == 0) { 5945 SCTP_STAT_INCR(sctps_hdrops); 5946 goto bad; 5947 } 5948 /* 5949 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5950 * IP/SCTP/first chunk header... 5951 */ 5952 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5953 sh, ch, &inp, &net, vrf_id); 5954 if ((net) && (port)) { 5955 if (net->port == 0) { 5956 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5957 } 5958 net->port = port; 5959 } 5960 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5961 net->flowid = m->m_pkthdr.flowid; 5962 #ifdef INVARIANTS 5963 net->flowidset = 1; 5964 #endif 5965 } 5966 /* inp's ref-count increased && stcb locked */ 5967 if (inp == NULL) { 5968 struct sctp_init_chunk *init_chk, chunk_buf; 5969 5970 SCTP_STAT_INCR(sctps_noport); 5971 #ifdef ICMP_BANDLIM 5972 /* 5973 * we use the bandwidth limiting to protect against sending 5974 * too many ABORTS all at once. In this case these count the 5975 * same as an ICMP message. 5976 */ 5977 if (badport_bandlim(0) < 0) 5978 goto bad; 5979 #endif /* ICMP_BANDLIM */ 5980 SCTPDBG(SCTP_DEBUG_INPUT1, 5981 "Sending a ABORT from packet entry!\n"); 5982 if (ch->chunk_type == SCTP_INITIATION) { 5983 /* 5984 * we do a trick here to get the INIT tag, dig in 5985 * and get the tag from the INIT and put it in the 5986 * common header. 5987 */ 5988 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5989 iphlen + sizeof(*sh), sizeof(*init_chk), 5990 (uint8_t *) & chunk_buf); 5991 if (init_chk != NULL) 5992 sh->v_tag = init_chk->init.initiate_tag; 5993 } 5994 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5995 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 5996 goto bad; 5997 } 5998 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5999 goto bad; 6000 } 6001 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6002 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6003 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6004 (ch->chunk_type != SCTP_INIT))) { 6005 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 6006 } 6007 } 6008 goto bad; 6009 } else if (stcb == NULL) { 6010 refcount_up = 1; 6011 } 6012 #ifdef IPSEC 6013 /* 6014 * I very much doubt any of the IPSEC stuff will work but I have no 6015 * idea, so I will leave it in place. 6016 */ 6017 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6018 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6019 SCTP_STAT_INCR(sctps_hdrops); 6020 goto bad; 6021 } 6022 #endif /* IPSEC */ 6023 6024 /* 6025 * common chunk processing 6026 */ 6027 length = ip->ip_len + iphlen; 6028 offset -= sizeof(struct sctp_chunkhdr); 6029 6030 ecn_bits = ip->ip_tos; 6031 6032 /* sa_ignore NO_NULL_CHK */ 6033 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 6034 inp, stcb, net, ecn_bits, vrf_id, port); 6035 /* inp's ref-count reduced && stcb unlocked */ 6036 if (m) { 6037 sctp_m_freem(m); 6038 } 6039 if ((inp) && (refcount_up)) { 6040 /* reduce ref-count */ 6041 SCTP_INP_DECR_REF(inp); 6042 } 6043 return; 6044 bad: 6045 if (stcb) { 6046 SCTP_TCB_UNLOCK(stcb); 6047 } 6048 if ((inp) && (refcount_up)) { 6049 /* reduce ref-count */ 6050 SCTP_INP_DECR_REF(inp); 6051 } 6052 if (m) { 6053 sctp_m_freem(m); 6054 } 6055 return; 6056 } 6057 6058 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6059 extern int *sctp_cpuarry; 6060 6061 #endif 6062 6063 void 6064 sctp_input(struct mbuf *m, int off) 6065 { 6066 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6067 struct ip *ip; 6068 struct sctphdr *sh; 6069 int offset; 6070 int cpu_to_use; 6071 uint32_t flowid, tag; 6072 6073 if (mp_ncpus > 1) { 6074 if (m->m_flags & M_FLOWID) { 6075 flowid = m->m_pkthdr.flowid; 6076 } else { 6077 /* 6078 * No flow id built by lower layers fix it so we 6079 * create one. 6080 */ 6081 ip = mtod(m, struct ip *); 6082 offset = off + sizeof(*sh); 6083 if (SCTP_BUF_LEN(m) < offset) { 6084 if ((m = m_pullup(m, offset)) == 0) { 6085 SCTP_STAT_INCR(sctps_hdrops); 6086 return; 6087 } 6088 ip = mtod(m, struct ip *); 6089 } 6090 sh = (struct sctphdr *)((caddr_t)ip + off); 6091 tag = htonl(sh->v_tag); 6092 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6093 m->m_pkthdr.flowid = flowid; 6094 m->m_flags |= M_FLOWID; 6095 } 6096 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6097 sctp_queue_to_mcore(m, off, cpu_to_use); 6098 return; 6099 } 6100 #endif 6101 sctp_input_with_port(m, off, 0); 6102 } 6103 6104 #endif 6105