1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #include <netinet/udp.h> 51 52 53 54 static void 55 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 56 { 57 struct sctp_nets *net; 58 59 /* 60 * This now not only stops all cookie timers it also stops any INIT 61 * timers as well. This will make sure that the timers are stopped 62 * in all collision cases. 63 */ 64 SCTP_TCB_LOCK_ASSERT(stcb); 65 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 66 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 67 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 68 stcb->sctp_ep, 69 stcb, 70 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 71 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 76 } 77 } 78 } 79 80 /* INIT handler */ 81 static void 82 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 83 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 84 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 85 { 86 struct sctp_init *init; 87 struct mbuf *op_err; 88 uint32_t init_limit; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 95 goto outnow; 96 } 97 } 98 op_err = NULL; 99 init = &cp->init; 100 /* First are we accepting? */ 101 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 102 SCTPDBG(SCTP_DEBUG_INPUT2, 103 "sctp_handle_init: Abort, so_qlimit:%d\n", 104 inp->sctp_socket->so_qlimit); 105 /* 106 * FIX ME ?? What about TCP model and we have a 107 * match/restart case? Actually no fix is needed. the lookup 108 * will always find the existing assoc so stcb would not be 109 * NULL. It may be questionable to do this since we COULD 110 * just send back the INIT-ACK and hope that the app did 111 * accept()'s by the time the COOKIE was sent. But there is 112 * a price to pay for COOKIE generation and I don't want to 113 * pay it on the chance that the app will actually do some 114 * accepts(). The App just looses and should NOT be in this 115 * state :-) 116 */ 117 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 124 /* Invalid length */ 125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 126 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 /* validate parameters */ 133 if (init->initiate_tag == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 143 /* invalid parameter... send abort */ 144 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 145 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 146 vrf_id, port); 147 if (stcb) 148 *abort_no_unlock = 1; 149 goto outnow; 150 } 151 if (init->num_inbound_streams == 0) { 152 /* protocol error... send abort */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 if (init->num_outbound_streams == 0) { 161 /* protocol error... send abort */ 162 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 163 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 164 vrf_id, port); 165 if (stcb) 166 *abort_no_unlock = 1; 167 goto outnow; 168 } 169 init_limit = offset + ntohs(cp->ch.chunk_length); 170 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 171 init_limit)) { 172 /* auth parameter(s) error... send abort */ 173 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 174 if (stcb) 175 *abort_no_unlock = 1; 176 goto outnow; 177 } 178 /* send an INIT-ACK w/cookie */ 179 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 180 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 181 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 182 outnow: 183 if (stcb == NULL) { 184 SCTP_INP_RUNLOCK(inp); 185 } 186 } 187 188 /* 189 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 190 */ 191 192 int 193 sctp_is_there_unsent_data(struct sctp_tcb *stcb) 194 { 195 int unsent_data = 0; 196 struct sctp_stream_queue_pending *sp; 197 struct sctp_stream_out *strq; 198 struct sctp_association *asoc; 199 200 /* 201 * This function returns the number of streams that have true unsent 202 * data on them. Note that as it looks through it will clean up any 203 * places that have old data that has been sent but left at top of 204 * stream queue. 205 */ 206 asoc = &stcb->asoc; 207 SCTP_TCB_SEND_LOCK(stcb); 208 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 209 /* Check to see if some data queued */ 210 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 211 is_there_another: 212 /* sa_ignore FREED_MEMORY */ 213 sp = TAILQ_FIRST(&strq->outqueue); 214 if (sp == NULL) { 215 continue; 216 } 217 if ((sp->msg_is_complete) && 218 (sp->length == 0) && 219 (sp->sender_all_done)) { 220 /* 221 * We are doing differed cleanup. Last time 222 * through when we took all the data the 223 * sender_all_done was not set. 224 */ 225 if (sp->put_last_out == 0) { 226 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 227 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 228 sp->sender_all_done, 229 sp->length, 230 sp->msg_is_complete, 231 sp->put_last_out); 232 } 233 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 234 TAILQ_REMOVE(&strq->outqueue, sp, next); 235 sctp_free_remote_addr(sp->net); 236 if (sp->data) { 237 sctp_m_freem(sp->data); 238 sp->data = NULL; 239 } 240 sctp_free_a_strmoq(stcb, sp); 241 goto is_there_another; 242 } else { 243 unsent_data++; 244 continue; 245 } 246 } 247 } 248 SCTP_TCB_SEND_UNLOCK(stcb); 249 return (unsent_data); 250 } 251 252 static int 253 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 254 struct sctp_nets *net) 255 { 256 struct sctp_init *init; 257 struct sctp_association *asoc; 258 struct sctp_nets *lnet; 259 unsigned int i; 260 261 init = &cp->init; 262 asoc = &stcb->asoc; 263 /* save off parameters */ 264 asoc->peer_vtag = ntohl(init->initiate_tag); 265 asoc->peers_rwnd = ntohl(init->a_rwnd); 266 if (TAILQ_FIRST(&asoc->nets)) { 267 /* update any ssthresh's that may have a default */ 268 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 269 lnet->ssthresh = asoc->peers_rwnd; 270 271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 272 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 273 } 274 } 275 } 276 SCTP_TCB_SEND_LOCK(stcb); 277 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 278 unsigned int newcnt; 279 struct sctp_stream_out *outs; 280 struct sctp_stream_queue_pending *sp; 281 struct sctp_tmit_chunk *chk, *chk_next; 282 283 /* abandon the upper streams */ 284 newcnt = ntohs(init->num_inbound_streams); 285 if (!TAILQ_EMPTY(&asoc->send_queue)) { 286 chk = TAILQ_FIRST(&asoc->send_queue); 287 while (chk) { 288 chk_next = TAILQ_NEXT(chk, sctp_next); 289 if (chk->rec.data.stream_number >= newcnt) { 290 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 291 asoc->send_queue_cnt--; 292 if (chk->data != NULL) { 293 sctp_free_bufspace(stcb, asoc, chk, 1); 294 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 295 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 296 if (chk->data) { 297 sctp_m_freem(chk->data); 298 chk->data = NULL; 299 } 300 } 301 sctp_free_a_chunk(stcb, chk); 302 /* sa_ignore FREED_MEMORY */ 303 } 304 chk = chk_next; 305 } 306 } 307 if (asoc->strmout) { 308 for (i = newcnt; i < asoc->pre_open_streams; i++) { 309 outs = &asoc->strmout[i]; 310 sp = TAILQ_FIRST(&outs->outqueue); 311 while (sp) { 312 TAILQ_REMOVE(&outs->outqueue, sp, next); 313 asoc->stream_queue_cnt--; 314 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 315 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 316 sp, SCTP_SO_NOT_LOCKED); 317 if (sp->data) { 318 sctp_m_freem(sp->data); 319 sp->data = NULL; 320 } 321 sctp_free_remote_addr(sp->net); 322 sp->net = NULL; 323 /* Free the chunk */ 324 sctp_free_a_strmoq(stcb, sp); 325 /* sa_ignore FREED_MEMORY */ 326 sp = TAILQ_FIRST(&outs->outqueue); 327 } 328 } 329 } 330 /* cut back the count */ 331 asoc->pre_open_streams = newcnt; 332 } 333 SCTP_TCB_SEND_UNLOCK(stcb); 334 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 335 /* init tsn's */ 336 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 337 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 338 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 339 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 340 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 341 } 342 /* This is the next one we expect */ 343 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 344 345 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 346 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 347 asoc->last_echo_tsn = asoc->asconf_seq_in; 348 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 349 /* open the requested streams */ 350 351 if (asoc->strmin != NULL) { 352 /* Free the old ones */ 353 struct sctp_queued_to_read *ctl; 354 355 for (i = 0; i < asoc->streamincnt; i++) { 356 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 357 while (ctl) { 358 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 359 sctp_free_remote_addr(ctl->whoFrom); 360 ctl->whoFrom = NULL; 361 sctp_m_freem(ctl->data); 362 ctl->data = NULL; 363 sctp_free_a_readq(stcb, ctl); 364 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 365 } 366 } 367 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 368 } 369 asoc->streamincnt = ntohs(init->num_outbound_streams); 370 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 371 asoc->streamincnt = MAX_SCTP_STREAMS; 372 } 373 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 374 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 375 if (asoc->strmin == NULL) { 376 /* we didn't get memory for the streams! */ 377 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 378 return (-1); 379 } 380 for (i = 0; i < asoc->streamincnt; i++) { 381 asoc->strmin[i].stream_no = i; 382 asoc->strmin[i].last_sequence_delivered = 0xffff; 383 /* 384 * U-stream ranges will be set when the cookie is unpacked. 385 * Or for the INIT sender they are un set (if pr-sctp not 386 * supported) when the INIT-ACK arrives. 387 */ 388 TAILQ_INIT(&asoc->strmin[i].inqueue); 389 asoc->strmin[i].delivery_started = 0; 390 } 391 /* 392 * load_address_from_init will put the addresses into the 393 * association when the COOKIE is processed or the INIT-ACK is 394 * processed. Both types of COOKIE's existing and new call this 395 * routine. It will remove addresses that are no longer in the 396 * association (for the restarting case where addresses are 397 * removed). Up front when the INIT arrives we will discard it if it 398 * is a restart and new addresses have been added. 399 */ 400 /* sa_ignore MEMLEAK */ 401 return (0); 402 } 403 404 /* 405 * INIT-ACK message processing/consumption returns value < 0 on error 406 */ 407 static int 408 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 409 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 410 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 411 { 412 struct sctp_association *asoc; 413 struct mbuf *op_err; 414 int retval, abort_flag; 415 uint32_t initack_limit; 416 int nat_friendly = 0; 417 418 /* First verify that we have no illegal param's */ 419 abort_flag = 0; 420 op_err = NULL; 421 422 op_err = sctp_arethere_unrecognized_parameters(m, 423 (offset + sizeof(struct sctp_init_chunk)), 424 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 425 if (abort_flag) { 426 /* Send an abort and notify peer */ 427 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 428 *abort_no_unlock = 1; 429 return (-1); 430 } 431 asoc = &stcb->asoc; 432 asoc->peer_supports_nat = (uint8_t) nat_friendly; 433 /* process the peer's parameters in the INIT-ACK */ 434 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 435 if (retval < 0) { 436 return (retval); 437 } 438 initack_limit = offset + ntohs(cp->ch.chunk_length); 439 /* load all addresses */ 440 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 441 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 442 NULL))) { 443 /* Huh, we should abort */ 444 SCTPDBG(SCTP_DEBUG_INPUT1, 445 "Load addresses from INIT causes an abort %d\n", 446 retval); 447 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 448 NULL, 0, net->port); 449 *abort_no_unlock = 1; 450 return (-1); 451 } 452 /* if the peer doesn't support asconf, flush the asconf queue */ 453 if (asoc->peer_supports_asconf == 0) { 454 struct sctp_asconf_addr *aparam; 455 456 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 457 /* sa_ignore FREED_MEMORY */ 458 aparam = TAILQ_FIRST(&asoc->asconf_queue); 459 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 460 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 461 } 462 } 463 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 464 stcb->asoc.local_hmacs); 465 if (op_err) { 466 sctp_queue_op_err(stcb, op_err); 467 /* queuing will steal away the mbuf chain to the out queue */ 468 op_err = NULL; 469 } 470 /* extract the cookie and queue it to "echo" it back... */ 471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 472 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 473 stcb->asoc.overall_error_count, 474 0, 475 SCTP_FROM_SCTP_INPUT, 476 __LINE__); 477 } 478 stcb->asoc.overall_error_count = 0; 479 net->error_count = 0; 480 481 /* 482 * Cancel the INIT timer, We do this first before queueing the 483 * cookie. We always cancel at the primary to assue that we are 484 * canceling the timer started by the INIT which always goes to the 485 * primary. 486 */ 487 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 488 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 489 490 /* calculate the RTO */ 491 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 492 493 retval = sctp_send_cookie_echo(m, offset, stcb, net); 494 if (retval < 0) { 495 /* 496 * No cookie, we probably should send a op error. But in any 497 * case if there is no cookie in the INIT-ACK, we can 498 * abandon the peer, its broke. 499 */ 500 if (retval == -3) { 501 /* We abort with an error of missing mandatory param */ 502 op_err = 503 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 504 if (op_err) { 505 /* 506 * Expand beyond to include the mandatory 507 * param cookie 508 */ 509 struct sctp_inv_mandatory_param *mp; 510 511 SCTP_BUF_LEN(op_err) = 512 sizeof(struct sctp_inv_mandatory_param); 513 mp = mtod(op_err, 514 struct sctp_inv_mandatory_param *); 515 /* Subtract the reserved param */ 516 mp->length = 517 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 518 mp->num_param = htonl(1); 519 mp->param = htons(SCTP_STATE_COOKIE); 520 mp->resv = 0; 521 } 522 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 523 sh, op_err, 0, net->port); 524 *abort_no_unlock = 1; 525 } 526 return (retval); 527 } 528 return (0); 529 } 530 531 static void 532 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 533 struct sctp_tcb *stcb, struct sctp_nets *net) 534 { 535 struct sockaddr_storage store; 536 struct sockaddr_in *sin; 537 struct sockaddr_in6 *sin6; 538 struct sctp_nets *r_net; 539 struct timeval tv; 540 int req_prim = 0; 541 542 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 543 /* Invalid length */ 544 return; 545 } 546 sin = (struct sockaddr_in *)&store; 547 sin6 = (struct sockaddr_in6 *)&store; 548 549 memset(&store, 0, sizeof(store)); 550 if (cp->heartbeat.hb_info.addr_family == AF_INET && 551 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 552 sin->sin_family = cp->heartbeat.hb_info.addr_family; 553 sin->sin_len = cp->heartbeat.hb_info.addr_len; 554 sin->sin_port = stcb->rport; 555 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 556 sizeof(sin->sin_addr)); 557 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 558 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 559 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 560 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 561 sin6->sin6_port = stcb->rport; 562 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 563 sizeof(sin6->sin6_addr)); 564 } else { 565 return; 566 } 567 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 568 if (r_net == NULL) { 569 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 570 return; 571 } 572 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 573 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 574 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 575 /* 576 * If the its a HB and it's random value is correct when can 577 * confirm the destination. 578 */ 579 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 580 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 581 stcb->asoc.primary_destination = r_net; 582 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 583 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 584 r_net = TAILQ_FIRST(&stcb->asoc.nets); 585 if (r_net != stcb->asoc.primary_destination) { 586 /* 587 * first one on the list is NOT the primary 588 * sctp_cmpaddr() is much more efficent if 589 * the primary is the first on the list, 590 * make it so. 591 */ 592 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 593 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 594 } 595 req_prim = 1; 596 } 597 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 598 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 599 } 600 r_net->error_count = 0; 601 r_net->hb_responded = 1; 602 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 603 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 604 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 605 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 606 r_net->dest_state |= SCTP_ADDR_REACHABLE; 607 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 608 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 609 /* now was it the primary? if so restore */ 610 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 611 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 612 } 613 } 614 /* 615 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 616 * set the destination to active state and set the cwnd to one or 617 * two MTU's based on whether PF1 or PF2 is being used. If a T3 618 * timer is running, for the destination, stop the timer because a 619 * PF-heartbeat was received. 620 */ 621 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 622 SCTP_BASE_SYSCTL(sctp_cmt_pf) && 623 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 624 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 625 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 626 stcb, net, 627 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 628 } 629 net->dest_state &= ~SCTP_ADDR_PF; 630 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 631 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 632 net, net->cwnd); 633 } 634 /* Now lets do a RTO with this */ 635 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 636 /* Mobility adaptation */ 637 if (req_prim) { 638 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 639 SCTP_MOBILITY_BASE) || 640 sctp_is_mobility_feature_on(stcb->sctp_ep, 641 SCTP_MOBILITY_FASTHANDOFF)) && 642 sctp_is_mobility_feature_on(stcb->sctp_ep, 643 SCTP_MOBILITY_PRIM_DELETED)) { 644 645 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 646 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 647 SCTP_MOBILITY_FASTHANDOFF)) { 648 sctp_assoc_immediate_retrans(stcb, 649 stcb->asoc.primary_destination); 650 } 651 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE)) { 653 sctp_move_chunks_from_deleted_prim(stcb, 654 stcb->asoc.primary_destination); 655 } 656 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 657 stcb->asoc.deleted_primary); 658 } 659 } 660 } 661 662 static int 663 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 664 { 665 /* 666 * return 0 means we want you to proceed with the abort non-zero 667 * means no abort processing 668 */ 669 struct sctpasochead *head; 670 671 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 672 /* generate a new vtag and send init */ 673 LIST_REMOVE(stcb, sctp_asocs); 674 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 675 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 676 /* 677 * put it in the bucket in the vtag hash of assoc's for the 678 * system 679 */ 680 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 681 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 682 return (1); 683 } 684 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 685 /* 686 * treat like a case where the cookie expired i.e.: - dump 687 * current cookie. - generate a new vtag. - resend init. 688 */ 689 /* generate a new vtag and send init */ 690 LIST_REMOVE(stcb, sctp_asocs); 691 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 692 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 693 sctp_stop_all_cookie_timers(stcb); 694 sctp_toss_old_cookies(stcb, &stcb->asoc); 695 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 696 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 697 /* 698 * put it in the bucket in the vtag hash of assoc's for the 699 * system 700 */ 701 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 702 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 703 return (1); 704 } 705 return (0); 706 } 707 708 static int 709 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 710 struct sctp_nets *net) 711 { 712 /* 713 * return 0 means we want you to proceed with the abort non-zero 714 * means no abort processing 715 */ 716 if (stcb->asoc.peer_supports_auth == 0) { 717 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 718 return (0); 719 } 720 sctp_asconf_send_nat_state_update(stcb, net); 721 return (1); 722 } 723 724 725 static void 726 sctp_handle_abort(struct sctp_abort_chunk *cp, 727 struct sctp_tcb *stcb, struct sctp_nets *net) 728 { 729 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 730 struct socket *so; 731 732 #endif 733 uint16_t len; 734 735 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 736 if (stcb == NULL) 737 return; 738 739 len = ntohs(cp->ch.chunk_length); 740 if (len > sizeof(struct sctp_chunkhdr)) { 741 /* 742 * Need to check the cause codes for our two magic nat 743 * aborts which don't kill the assoc necessarily. 744 */ 745 struct sctp_abort_chunk *cpnext; 746 struct sctp_missing_nat_state *natc; 747 uint16_t cause; 748 749 cpnext = cp; 750 cpnext++; 751 natc = (struct sctp_missing_nat_state *)cpnext; 752 cause = ntohs(natc->cause); 753 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 754 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 755 cp->ch.chunk_flags); 756 if (sctp_handle_nat_colliding_state(stcb)) { 757 return; 758 } 759 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 760 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 761 cp->ch.chunk_flags); 762 if (sctp_handle_nat_missing_state(stcb, net)) { 763 return; 764 } 765 } 766 } 767 /* stop any receive timers */ 768 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 769 /* notify user of the abort and clean up... */ 770 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 771 /* free the tcb */ 772 #if defined(SCTP_PANIC_ON_ABORT) 773 printf("stcb:%p state:%d rport:%d net:%p\n", 774 stcb, stcb->asoc.state, stcb->rport, net); 775 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 776 panic("Received an ABORT"); 777 } else { 778 printf("No panic its in state %x closed\n", stcb->asoc.state); 779 } 780 #endif 781 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 782 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 783 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 784 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 785 } 786 #ifdef SCTP_ASOCLOG_OF_TSNS 787 sctp_print_out_track_log(stcb); 788 #endif 789 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 790 so = SCTP_INP_SO(stcb->sctp_ep); 791 atomic_add_int(&stcb->asoc.refcnt, 1); 792 SCTP_TCB_UNLOCK(stcb); 793 SCTP_SOCKET_LOCK(so, 1); 794 SCTP_TCB_LOCK(stcb); 795 atomic_subtract_int(&stcb->asoc.refcnt, 1); 796 #endif 797 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 800 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 801 SCTP_SOCKET_UNLOCK(so, 1); 802 #endif 803 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 804 } 805 806 static void 807 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 808 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 809 { 810 struct sctp_association *asoc; 811 int some_on_streamwheel; 812 813 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 814 struct socket *so; 815 816 #endif 817 818 SCTPDBG(SCTP_DEBUG_INPUT2, 819 "sctp_handle_shutdown: handling SHUTDOWN\n"); 820 if (stcb == NULL) 821 return; 822 asoc = &stcb->asoc; 823 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 824 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 825 return; 826 } 827 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 828 /* Shutdown NOT the expected size */ 829 return; 830 } else { 831 sctp_update_acked(stcb, cp, net, abort_flag); 832 if (*abort_flag) { 833 return; 834 } 835 } 836 if (asoc->control_pdapi) { 837 /* 838 * With a normal shutdown we assume the end of last record. 839 */ 840 SCTP_INP_READ_LOCK(stcb->sctp_ep); 841 asoc->control_pdapi->end_added = 1; 842 asoc->control_pdapi->pdapi_aborted = 1; 843 asoc->control_pdapi = NULL; 844 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 845 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 846 so = SCTP_INP_SO(stcb->sctp_ep); 847 atomic_add_int(&stcb->asoc.refcnt, 1); 848 SCTP_TCB_UNLOCK(stcb); 849 SCTP_SOCKET_LOCK(so, 1); 850 SCTP_TCB_LOCK(stcb); 851 atomic_subtract_int(&stcb->asoc.refcnt, 1); 852 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 853 /* assoc was freed while we were unlocked */ 854 SCTP_SOCKET_UNLOCK(so, 1); 855 return; 856 } 857 #endif 858 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 859 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 860 SCTP_SOCKET_UNLOCK(so, 1); 861 #endif 862 } 863 /* goto SHUTDOWN_RECEIVED state to block new requests */ 864 if (stcb->sctp_socket) { 865 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 866 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 867 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 868 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 869 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 870 /* 871 * notify upper layer that peer has initiated a 872 * shutdown 873 */ 874 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 875 876 /* reset time */ 877 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 878 } 879 } 880 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 881 /* 882 * stop the shutdown timer, since we WILL move to 883 * SHUTDOWN-ACK-SENT. 884 */ 885 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 886 } 887 /* Now is there unsent data on a stream somewhere? */ 888 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 889 890 if (!TAILQ_EMPTY(&asoc->send_queue) || 891 !TAILQ_EMPTY(&asoc->sent_queue) || 892 some_on_streamwheel) { 893 /* By returning we will push more data out */ 894 return; 895 } else { 896 /* no outstanding data to send, so move on... */ 897 /* send SHUTDOWN-ACK */ 898 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 899 /* move to SHUTDOWN-ACK-SENT state */ 900 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 901 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 902 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 903 } 904 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 905 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 906 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 907 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 908 /* start SHUTDOWN timer */ 909 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 910 stcb, net); 911 } 912 } 913 914 static void 915 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 916 struct sctp_tcb *stcb, 917 struct sctp_nets *net) 918 { 919 struct sctp_association *asoc; 920 921 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 922 struct socket *so; 923 924 so = SCTP_INP_SO(stcb->sctp_ep); 925 #endif 926 SCTPDBG(SCTP_DEBUG_INPUT2, 927 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 928 if (stcb == NULL) 929 return; 930 931 asoc = &stcb->asoc; 932 /* process according to association state */ 933 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 934 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 935 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 936 sctp_send_shutdown_complete(stcb, net, 1); 937 SCTP_TCB_UNLOCK(stcb); 938 return; 939 } 940 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 941 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 942 /* unexpected SHUTDOWN-ACK... so ignore... */ 943 SCTP_TCB_UNLOCK(stcb); 944 return; 945 } 946 if (asoc->control_pdapi) { 947 /* 948 * With a normal shutdown we assume the end of last record. 949 */ 950 SCTP_INP_READ_LOCK(stcb->sctp_ep); 951 asoc->control_pdapi->end_added = 1; 952 asoc->control_pdapi->pdapi_aborted = 1; 953 asoc->control_pdapi = NULL; 954 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 955 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 956 atomic_add_int(&stcb->asoc.refcnt, 1); 957 SCTP_TCB_UNLOCK(stcb); 958 SCTP_SOCKET_LOCK(so, 1); 959 SCTP_TCB_LOCK(stcb); 960 atomic_subtract_int(&stcb->asoc.refcnt, 1); 961 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 962 /* assoc was freed while we were unlocked */ 963 SCTP_SOCKET_UNLOCK(so, 1); 964 return; 965 } 966 #endif 967 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 968 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 969 SCTP_SOCKET_UNLOCK(so, 1); 970 #endif 971 } 972 /* are the queues empty? */ 973 if (!TAILQ_EMPTY(&asoc->send_queue) || 974 !TAILQ_EMPTY(&asoc->sent_queue) || 975 !TAILQ_EMPTY(&asoc->out_wheel)) { 976 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 977 } 978 /* stop the timer */ 979 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 980 /* send SHUTDOWN-COMPLETE */ 981 sctp_send_shutdown_complete(stcb, net, 0); 982 /* notify upper layer protocol */ 983 if (stcb->sctp_socket) { 984 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 985 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 986 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 987 /* Set the connected flag to disconnected */ 988 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 989 } 990 } 991 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 992 /* free the TCB but first save off the ep */ 993 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 994 atomic_add_int(&stcb->asoc.refcnt, 1); 995 SCTP_TCB_UNLOCK(stcb); 996 SCTP_SOCKET_LOCK(so, 1); 997 SCTP_TCB_LOCK(stcb); 998 atomic_subtract_int(&stcb->asoc.refcnt, 1); 999 #endif 1000 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1001 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1002 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1003 SCTP_SOCKET_UNLOCK(so, 1); 1004 #endif 1005 } 1006 1007 /* 1008 * Skip past the param header and then we will find the chunk that caused the 1009 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1010 * our peer must be broken. 1011 */ 1012 static void 1013 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1014 struct sctp_nets *net) 1015 { 1016 struct sctp_chunkhdr *chk; 1017 1018 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1019 switch (chk->chunk_type) { 1020 case SCTP_ASCONF_ACK: 1021 case SCTP_ASCONF: 1022 sctp_asconf_cleanup(stcb, net); 1023 break; 1024 case SCTP_FORWARD_CUM_TSN: 1025 stcb->asoc.peer_supports_prsctp = 0; 1026 break; 1027 default: 1028 SCTPDBG(SCTP_DEBUG_INPUT2, 1029 "Peer does not support chunk type %d(%x)??\n", 1030 chk->chunk_type, (uint32_t) chk->chunk_type); 1031 break; 1032 } 1033 } 1034 1035 /* 1036 * Skip past the param header and then we will find the param that caused the 1037 * problem. There are a number of param's in a ASCONF OR the prsctp param 1038 * these will turn of specific features. 1039 */ 1040 static void 1041 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1042 { 1043 struct sctp_paramhdr *pbad; 1044 1045 pbad = phdr + 1; 1046 switch (ntohs(pbad->param_type)) { 1047 /* pr-sctp draft */ 1048 case SCTP_PRSCTP_SUPPORTED: 1049 stcb->asoc.peer_supports_prsctp = 0; 1050 break; 1051 case SCTP_SUPPORTED_CHUNK_EXT: 1052 break; 1053 /* draft-ietf-tsvwg-addip-sctp */ 1054 case SCTP_HAS_NAT_SUPPORT: 1055 stcb->asoc.peer_supports_nat = 0; 1056 break; 1057 case SCTP_ECN_NONCE_SUPPORTED: 1058 stcb->asoc.peer_supports_ecn_nonce = 0; 1059 stcb->asoc.ecn_nonce_allowed = 0; 1060 stcb->asoc.ecn_allowed = 0; 1061 break; 1062 case SCTP_ADD_IP_ADDRESS: 1063 case SCTP_DEL_IP_ADDRESS: 1064 case SCTP_SET_PRIM_ADDR: 1065 stcb->asoc.peer_supports_asconf = 0; 1066 break; 1067 case SCTP_SUCCESS_REPORT: 1068 case SCTP_ERROR_CAUSE_IND: 1069 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1070 SCTPDBG(SCTP_DEBUG_INPUT2, 1071 "Turning off ASCONF to this strange peer\n"); 1072 stcb->asoc.peer_supports_asconf = 0; 1073 break; 1074 default: 1075 SCTPDBG(SCTP_DEBUG_INPUT2, 1076 "Peer does not support param type %d(%x)??\n", 1077 pbad->param_type, (uint32_t) pbad->param_type); 1078 break; 1079 } 1080 } 1081 1082 static int 1083 sctp_handle_error(struct sctp_chunkhdr *ch, 1084 struct sctp_tcb *stcb, struct sctp_nets *net) 1085 { 1086 int chklen; 1087 struct sctp_paramhdr *phdr; 1088 uint16_t error_type; 1089 uint16_t error_len; 1090 struct sctp_association *asoc; 1091 int adjust; 1092 1093 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1094 struct socket *so; 1095 1096 #endif 1097 1098 /* parse through all of the errors and process */ 1099 asoc = &stcb->asoc; 1100 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1101 sizeof(struct sctp_chunkhdr)); 1102 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1103 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1104 /* Process an Error Cause */ 1105 error_type = ntohs(phdr->param_type); 1106 error_len = ntohs(phdr->param_length); 1107 if ((error_len > chklen) || (error_len == 0)) { 1108 /* invalid param length for this param */ 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1110 chklen, error_len); 1111 return (0); 1112 } 1113 switch (error_type) { 1114 case SCTP_CAUSE_INVALID_STREAM: 1115 case SCTP_CAUSE_MISSING_PARAM: 1116 case SCTP_CAUSE_INVALID_PARAM: 1117 case SCTP_CAUSE_NO_USER_DATA: 1118 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1119 error_type); 1120 break; 1121 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1122 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1123 ch->chunk_flags); 1124 if (sctp_handle_nat_colliding_state(stcb)) { 1125 return (0); 1126 } 1127 break; 1128 case SCTP_CAUSE_NAT_MISSING_STATE: 1129 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1130 ch->chunk_flags); 1131 if (sctp_handle_nat_missing_state(stcb, net)) { 1132 return (0); 1133 } 1134 break; 1135 case SCTP_CAUSE_STALE_COOKIE: 1136 /* 1137 * We only act if we have echoed a cookie and are 1138 * waiting. 1139 */ 1140 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1141 int *p; 1142 1143 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1144 /* Save the time doubled */ 1145 asoc->cookie_preserve_req = ntohl(*p) << 1; 1146 asoc->stale_cookie_count++; 1147 if (asoc->stale_cookie_count > 1148 asoc->max_init_times) { 1149 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1150 /* now free the asoc */ 1151 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1152 so = SCTP_INP_SO(stcb->sctp_ep); 1153 atomic_add_int(&stcb->asoc.refcnt, 1); 1154 SCTP_TCB_UNLOCK(stcb); 1155 SCTP_SOCKET_LOCK(so, 1); 1156 SCTP_TCB_LOCK(stcb); 1157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1158 #endif 1159 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1160 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1161 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1162 SCTP_SOCKET_UNLOCK(so, 1); 1163 #endif 1164 return (-1); 1165 } 1166 /* blast back to INIT state */ 1167 sctp_toss_old_cookies(stcb, &stcb->asoc); 1168 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1169 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1170 sctp_stop_all_cookie_timers(stcb); 1171 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1172 } 1173 break; 1174 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1175 /* 1176 * Nothing we can do here, we don't do hostname 1177 * addresses so if the peer does not like my IPv6 1178 * (or IPv4 for that matter) it does not matter. If 1179 * they don't support that type of address, they can 1180 * NOT possibly get that packet type... i.e. with no 1181 * IPv6 you can't recieve a IPv6 packet. so we can 1182 * safely ignore this one. If we ever added support 1183 * for HOSTNAME Addresses, then we would need to do 1184 * something here. 1185 */ 1186 break; 1187 case SCTP_CAUSE_UNRECOG_CHUNK: 1188 sctp_process_unrecog_chunk(stcb, phdr, net); 1189 break; 1190 case SCTP_CAUSE_UNRECOG_PARAM: 1191 sctp_process_unrecog_param(stcb, phdr); 1192 break; 1193 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1194 /* 1195 * We ignore this since the timer will drive out a 1196 * new cookie anyway and there timer will drive us 1197 * to send a SHUTDOWN_COMPLETE. We can't send one 1198 * here since we don't have their tag. 1199 */ 1200 break; 1201 case SCTP_CAUSE_DELETING_LAST_ADDR: 1202 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1203 case SCTP_CAUSE_DELETING_SRC_ADDR: 1204 /* 1205 * We should NOT get these here, but in a 1206 * ASCONF-ACK. 1207 */ 1208 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1209 error_type); 1210 break; 1211 case SCTP_CAUSE_OUT_OF_RESC: 1212 /* 1213 * And what, pray tell do we do with the fact that 1214 * the peer is out of resources? Not really sure we 1215 * could do anything but abort. I suspect this 1216 * should have came WITH an abort instead of in a 1217 * OP-ERROR. 1218 */ 1219 break; 1220 default: 1221 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1222 error_type); 1223 break; 1224 } 1225 adjust = SCTP_SIZE32(error_len); 1226 chklen -= adjust; 1227 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1228 } 1229 return (0); 1230 } 1231 1232 static int 1233 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1234 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1235 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1236 { 1237 struct sctp_init_ack *init_ack; 1238 struct mbuf *op_err; 1239 1240 SCTPDBG(SCTP_DEBUG_INPUT2, 1241 "sctp_handle_init_ack: handling INIT-ACK\n"); 1242 1243 if (stcb == NULL) { 1244 SCTPDBG(SCTP_DEBUG_INPUT2, 1245 "sctp_handle_init_ack: TCB is null\n"); 1246 return (-1); 1247 } 1248 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1249 /* Invalid length */ 1250 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1251 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1252 op_err, 0, net->port); 1253 *abort_no_unlock = 1; 1254 return (-1); 1255 } 1256 init_ack = &cp->init; 1257 /* validate parameters */ 1258 if (init_ack->initiate_tag == 0) { 1259 /* protocol error... send an abort */ 1260 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1261 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1262 op_err, 0, net->port); 1263 *abort_no_unlock = 1; 1264 return (-1); 1265 } 1266 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1267 /* protocol error... send an abort */ 1268 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1269 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1270 op_err, 0, net->port); 1271 *abort_no_unlock = 1; 1272 return (-1); 1273 } 1274 if (init_ack->num_inbound_streams == 0) { 1275 /* protocol error... send an abort */ 1276 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1277 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1278 op_err, 0, net->port); 1279 *abort_no_unlock = 1; 1280 return (-1); 1281 } 1282 if (init_ack->num_outbound_streams == 0) { 1283 /* protocol error... send an abort */ 1284 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1285 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1286 op_err, 0, net->port); 1287 *abort_no_unlock = 1; 1288 return (-1); 1289 } 1290 /* process according to association state... */ 1291 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1292 case SCTP_STATE_COOKIE_WAIT: 1293 /* this is the expected state for this chunk */ 1294 /* process the INIT-ACK parameters */ 1295 if (stcb->asoc.primary_destination->dest_state & 1296 SCTP_ADDR_UNCONFIRMED) { 1297 /* 1298 * The primary is where we sent the INIT, we can 1299 * always consider it confirmed when the INIT-ACK is 1300 * returned. Do this before we load addresses 1301 * though. 1302 */ 1303 stcb->asoc.primary_destination->dest_state &= 1304 ~SCTP_ADDR_UNCONFIRMED; 1305 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1306 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1307 } 1308 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1309 net, abort_no_unlock, vrf_id) < 0) { 1310 /* error in parsing parameters */ 1311 return (-1); 1312 } 1313 /* update our state */ 1314 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1315 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1316 1317 /* reset the RTO calc */ 1318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1319 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1320 stcb->asoc.overall_error_count, 1321 0, 1322 SCTP_FROM_SCTP_INPUT, 1323 __LINE__); 1324 } 1325 stcb->asoc.overall_error_count = 0; 1326 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1327 /* 1328 * collapse the init timer back in case of a exponential 1329 * backoff 1330 */ 1331 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1332 stcb, net); 1333 /* 1334 * the send at the end of the inbound data processing will 1335 * cause the cookie to be sent 1336 */ 1337 break; 1338 case SCTP_STATE_SHUTDOWN_SENT: 1339 /* incorrect state... discard */ 1340 break; 1341 case SCTP_STATE_COOKIE_ECHOED: 1342 /* incorrect state... discard */ 1343 break; 1344 case SCTP_STATE_OPEN: 1345 /* incorrect state... discard */ 1346 break; 1347 case SCTP_STATE_EMPTY: 1348 case SCTP_STATE_INUSE: 1349 default: 1350 /* incorrect state... discard */ 1351 return (-1); 1352 break; 1353 } 1354 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1355 return (0); 1356 } 1357 1358 static struct sctp_tcb * 1359 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1360 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1361 struct sctp_inpcb *inp, struct sctp_nets **netp, 1362 struct sockaddr *init_src, int *notification, 1363 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1364 uint32_t vrf_id, uint16_t port); 1365 1366 1367 /* 1368 * handle a state cookie for an existing association m: input packet mbuf 1369 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1370 * "split" mbuf and the cookie signature does not exist offset: offset into 1371 * mbuf to the cookie-echo chunk 1372 */ 1373 static struct sctp_tcb * 1374 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1375 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1376 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1377 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1378 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1379 { 1380 struct sctp_association *asoc; 1381 struct sctp_init_chunk *init_cp, init_buf; 1382 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1383 struct sctp_nets *net; 1384 struct mbuf *op_err; 1385 struct sctp_paramhdr *ph; 1386 int chk_length; 1387 int init_offset, initack_offset, i; 1388 int retval; 1389 int spec_flag = 0; 1390 uint32_t how_indx; 1391 1392 net = *netp; 1393 /* I know that the TCB is non-NULL from the caller */ 1394 asoc = &stcb->asoc; 1395 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1396 if (asoc->cookie_how[how_indx] == 0) 1397 break; 1398 } 1399 if (how_indx < sizeof(asoc->cookie_how)) { 1400 asoc->cookie_how[how_indx] = 1; 1401 } 1402 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1403 /* SHUTDOWN came in after sending INIT-ACK */ 1404 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1405 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1406 0, M_DONTWAIT, 1, MT_DATA); 1407 if (op_err == NULL) { 1408 /* FOOBAR */ 1409 return (NULL); 1410 } 1411 /* Set the len */ 1412 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1413 ph = mtod(op_err, struct sctp_paramhdr *); 1414 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1415 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1416 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1417 vrf_id, net->port); 1418 if (how_indx < sizeof(asoc->cookie_how)) 1419 asoc->cookie_how[how_indx] = 2; 1420 return (NULL); 1421 } 1422 /* 1423 * find and validate the INIT chunk in the cookie (peer's info) the 1424 * INIT should start after the cookie-echo header struct (chunk 1425 * header, state cookie header struct) 1426 */ 1427 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1428 1429 init_cp = (struct sctp_init_chunk *) 1430 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1431 (uint8_t *) & init_buf); 1432 if (init_cp == NULL) { 1433 /* could not pull a INIT chunk in cookie */ 1434 return (NULL); 1435 } 1436 chk_length = ntohs(init_cp->ch.chunk_length); 1437 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1438 return (NULL); 1439 } 1440 /* 1441 * find and validate the INIT-ACK chunk in the cookie (my info) the 1442 * INIT-ACK follows the INIT chunk 1443 */ 1444 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1445 initack_cp = (struct sctp_init_ack_chunk *) 1446 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1447 (uint8_t *) & initack_buf); 1448 if (initack_cp == NULL) { 1449 /* could not pull INIT-ACK chunk in cookie */ 1450 return (NULL); 1451 } 1452 chk_length = ntohs(initack_cp->ch.chunk_length); 1453 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1454 return (NULL); 1455 } 1456 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1457 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1458 /* 1459 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1460 * to get into the OPEN state 1461 */ 1462 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1463 /*- 1464 * Opps, this means that we somehow generated two vtag's 1465 * the same. I.e. we did: 1466 * Us Peer 1467 * <---INIT(tag=a)------ 1468 * ----INIT-ACK(tag=t)--> 1469 * ----INIT(tag=t)------> *1 1470 * <---INIT-ACK(tag=a)--- 1471 * <----CE(tag=t)------------- *2 1472 * 1473 * At point *1 we should be generating a different 1474 * tag t'. Which means we would throw away the CE and send 1475 * ours instead. Basically this is case C (throw away side). 1476 */ 1477 if (how_indx < sizeof(asoc->cookie_how)) 1478 asoc->cookie_how[how_indx] = 17; 1479 return (NULL); 1480 1481 } 1482 switch SCTP_GET_STATE 1483 (asoc) { 1484 case SCTP_STATE_COOKIE_WAIT: 1485 case SCTP_STATE_COOKIE_ECHOED: 1486 /* 1487 * INIT was sent but got a COOKIE_ECHO with the 1488 * correct tags... just accept it...but we must 1489 * process the init so that we can make sure we have 1490 * the right seq no's. 1491 */ 1492 /* First we must process the INIT !! */ 1493 retval = sctp_process_init(init_cp, stcb, net); 1494 if (retval < 0) { 1495 if (how_indx < sizeof(asoc->cookie_how)) 1496 asoc->cookie_how[how_indx] = 3; 1497 return (NULL); 1498 } 1499 /* we have already processed the INIT so no problem */ 1500 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1501 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1502 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1503 /* update current state */ 1504 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1505 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1506 else 1507 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1508 1509 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1510 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1511 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1512 stcb->sctp_ep, stcb, asoc->primary_destination); 1513 } 1514 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1515 sctp_stop_all_cookie_timers(stcb); 1516 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1517 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1518 (inp->sctp_socket->so_qlimit == 0) 1519 ) { 1520 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1521 struct socket *so; 1522 1523 #endif 1524 /* 1525 * Here is where collision would go if we 1526 * did a connect() and instead got a 1527 * init/init-ack/cookie done before the 1528 * init-ack came back.. 1529 */ 1530 stcb->sctp_ep->sctp_flags |= 1531 SCTP_PCB_FLAGS_CONNECTED; 1532 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1533 so = SCTP_INP_SO(stcb->sctp_ep); 1534 atomic_add_int(&stcb->asoc.refcnt, 1); 1535 SCTP_TCB_UNLOCK(stcb); 1536 SCTP_SOCKET_LOCK(so, 1); 1537 SCTP_TCB_LOCK(stcb); 1538 atomic_add_int(&stcb->asoc.refcnt, -1); 1539 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1540 SCTP_SOCKET_UNLOCK(so, 1); 1541 return (NULL); 1542 } 1543 #endif 1544 soisconnected(stcb->sctp_socket); 1545 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1546 SCTP_SOCKET_UNLOCK(so, 1); 1547 #endif 1548 } 1549 /* notify upper layer */ 1550 *notification = SCTP_NOTIFY_ASSOC_UP; 1551 /* 1552 * since we did not send a HB make sure we don't 1553 * double things 1554 */ 1555 net->hb_responded = 1; 1556 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1557 &cookie->time_entered, sctp_align_unsafe_makecopy); 1558 1559 if (stcb->asoc.sctp_autoclose_ticks && 1560 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1561 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1562 inp, stcb, NULL); 1563 } 1564 break; 1565 default: 1566 /* 1567 * we're in the OPEN state (or beyond), so peer must 1568 * have simply lost the COOKIE-ACK 1569 */ 1570 break; 1571 } /* end switch */ 1572 sctp_stop_all_cookie_timers(stcb); 1573 /* 1574 * We ignore the return code here.. not sure if we should 1575 * somehow abort.. but we do have an existing asoc. This 1576 * really should not fail. 1577 */ 1578 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1579 init_offset + sizeof(struct sctp_init_chunk), 1580 initack_offset, sh, init_src)) { 1581 if (how_indx < sizeof(asoc->cookie_how)) 1582 asoc->cookie_how[how_indx] = 4; 1583 return (NULL); 1584 } 1585 /* respond with a COOKIE-ACK */ 1586 sctp_toss_old_cookies(stcb, asoc); 1587 sctp_send_cookie_ack(stcb); 1588 if (how_indx < sizeof(asoc->cookie_how)) 1589 asoc->cookie_how[how_indx] = 5; 1590 return (stcb); 1591 } 1592 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1593 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1594 cookie->tie_tag_my_vtag == 0 && 1595 cookie->tie_tag_peer_vtag == 0) { 1596 /* 1597 * case C in Section 5.2.4 Table 2: XMOO silently discard 1598 */ 1599 if (how_indx < sizeof(asoc->cookie_how)) 1600 asoc->cookie_how[how_indx] = 6; 1601 return (NULL); 1602 } 1603 /* 1604 * If nat support, and the below and stcb is established, send back 1605 * a ABORT(colliding state) if we are established. 1606 */ 1607 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1608 (asoc->peer_supports_nat) && 1609 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1610 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1611 (asoc->peer_vtag == 0)))) { 1612 /* 1613 * Special case - Peer's support nat. We may have two init's 1614 * that we gave out the same tag on since one was not 1615 * established.. i.e. we get INIT from host-1 behind the nat 1616 * and we respond tag-a, we get a INIT from host-2 behind 1617 * the nat and we get tag-a again. Then we bring up host-1 1618 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1619 * Now we have colliding state. We must send an abort here 1620 * with colliding state indication. 1621 */ 1622 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1623 0, M_DONTWAIT, 1, MT_DATA); 1624 if (op_err == NULL) { 1625 /* FOOBAR */ 1626 return (NULL); 1627 } 1628 /* pre-reserve some space */ 1629 #ifdef INET6 1630 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1631 #else 1632 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1633 #endif 1634 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1635 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1636 /* Set the len */ 1637 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1638 ph = mtod(op_err, struct sctp_paramhdr *); 1639 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1640 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1641 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1642 return (NULL); 1643 } 1644 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1645 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1646 (asoc->peer_vtag == 0))) { 1647 /* 1648 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1649 * should be ok, re-accept peer info 1650 */ 1651 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1652 /* 1653 * Extension of case C. If we hit this, then the 1654 * random number generator returned the same vtag 1655 * when we first sent our INIT-ACK and when we later 1656 * sent our INIT. The side with the seq numbers that 1657 * are different will be the one that normnally 1658 * would have hit case C. This in effect "extends" 1659 * our vtags in this collision case to be 64 bits. 1660 * The same collision could occur aka you get both 1661 * vtag and seq number the same twice in a row.. but 1662 * is much less likely. If it did happen then we 1663 * would proceed through and bring up the assoc.. we 1664 * may end up with the wrong stream setup however.. 1665 * which would be bad.. but there is no way to 1666 * tell.. until we send on a stream that does not 1667 * exist :-) 1668 */ 1669 if (how_indx < sizeof(asoc->cookie_how)) 1670 asoc->cookie_how[how_indx] = 7; 1671 1672 return (NULL); 1673 } 1674 if (how_indx < sizeof(asoc->cookie_how)) 1675 asoc->cookie_how[how_indx] = 8; 1676 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1677 sctp_stop_all_cookie_timers(stcb); 1678 /* 1679 * since we did not send a HB make sure we don't double 1680 * things 1681 */ 1682 net->hb_responded = 1; 1683 if (stcb->asoc.sctp_autoclose_ticks && 1684 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1685 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1686 NULL); 1687 } 1688 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1689 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1690 1691 /* Note last_cwr_tsn? where is this used? */ 1692 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1693 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1694 /* 1695 * Ok the peer probably discarded our data (if we 1696 * echoed a cookie+data). So anything on the 1697 * sent_queue should be marked for retransmit, we 1698 * may not get something to kick us so it COULD 1699 * still take a timeout to move these.. but it can't 1700 * hurt to mark them. 1701 */ 1702 struct sctp_tmit_chunk *chk; 1703 1704 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1705 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1706 chk->sent = SCTP_DATAGRAM_RESEND; 1707 sctp_flight_size_decrease(chk); 1708 sctp_total_flight_decrease(stcb, chk); 1709 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1710 spec_flag++; 1711 } 1712 } 1713 1714 } 1715 /* process the INIT info (peer's info) */ 1716 retval = sctp_process_init(init_cp, stcb, net); 1717 if (retval < 0) { 1718 if (how_indx < sizeof(asoc->cookie_how)) 1719 asoc->cookie_how[how_indx] = 9; 1720 return (NULL); 1721 } 1722 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1723 init_offset + sizeof(struct sctp_init_chunk), 1724 initack_offset, sh, init_src)) { 1725 if (how_indx < sizeof(asoc->cookie_how)) 1726 asoc->cookie_how[how_indx] = 10; 1727 return (NULL); 1728 } 1729 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1730 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1731 *notification = SCTP_NOTIFY_ASSOC_UP; 1732 1733 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1734 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1735 (inp->sctp_socket->so_qlimit == 0)) { 1736 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1737 struct socket *so; 1738 1739 #endif 1740 stcb->sctp_ep->sctp_flags |= 1741 SCTP_PCB_FLAGS_CONNECTED; 1742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1743 so = SCTP_INP_SO(stcb->sctp_ep); 1744 atomic_add_int(&stcb->asoc.refcnt, 1); 1745 SCTP_TCB_UNLOCK(stcb); 1746 SCTP_SOCKET_LOCK(so, 1); 1747 SCTP_TCB_LOCK(stcb); 1748 atomic_add_int(&stcb->asoc.refcnt, -1); 1749 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1750 SCTP_SOCKET_UNLOCK(so, 1); 1751 return (NULL); 1752 } 1753 #endif 1754 soisconnected(stcb->sctp_socket); 1755 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1756 SCTP_SOCKET_UNLOCK(so, 1); 1757 #endif 1758 } 1759 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1760 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1761 else 1762 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1763 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1764 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1765 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1766 } else { 1767 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1768 } 1769 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1770 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1771 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1772 stcb->sctp_ep, stcb, asoc->primary_destination); 1773 } 1774 sctp_stop_all_cookie_timers(stcb); 1775 sctp_toss_old_cookies(stcb, asoc); 1776 sctp_send_cookie_ack(stcb); 1777 if (spec_flag) { 1778 /* 1779 * only if we have retrans set do we do this. What 1780 * this call does is get only the COOKIE-ACK out and 1781 * then when we return the normal call to 1782 * sctp_chunk_output will get the retrans out behind 1783 * this. 1784 */ 1785 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1786 } 1787 if (how_indx < sizeof(asoc->cookie_how)) 1788 asoc->cookie_how[how_indx] = 11; 1789 1790 return (stcb); 1791 } 1792 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1793 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1794 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1795 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1796 cookie->tie_tag_peer_vtag != 0) { 1797 struct sctpasochead *head; 1798 1799 if (asoc->peer_supports_nat) { 1800 /* 1801 * This is a gross gross hack. just call the 1802 * cookie_new code since we are allowing a duplicate 1803 * association. I hope this works... 1804 */ 1805 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1806 inp, netp, init_src, notification, 1807 auth_skipped, auth_offset, auth_len, 1808 vrf_id, port)); 1809 } 1810 /* 1811 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1812 */ 1813 /* temp code */ 1814 if (how_indx < sizeof(asoc->cookie_how)) 1815 asoc->cookie_how[how_indx] = 12; 1816 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1817 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1818 1819 *sac_assoc_id = sctp_get_associd(stcb); 1820 /* notify upper layer */ 1821 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1822 atomic_add_int(&stcb->asoc.refcnt, 1); 1823 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1824 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1825 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1826 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1827 } 1828 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1829 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1830 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1831 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1832 } 1833 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1834 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1835 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1836 stcb->sctp_ep, stcb, asoc->primary_destination); 1837 1838 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1839 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1840 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1841 } 1842 asoc->pre_open_streams = 1843 ntohs(initack_cp->init.num_outbound_streams); 1844 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1845 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1846 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1847 1848 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1849 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1850 1851 asoc->str_reset_seq_in = asoc->init_seq_number; 1852 1853 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1854 if (asoc->mapping_array) { 1855 memset(asoc->mapping_array, 0, 1856 asoc->mapping_array_size); 1857 } 1858 if (asoc->nr_mapping_array) { 1859 memset(asoc->nr_mapping_array, 0, 1860 asoc->mapping_array_size); 1861 } 1862 SCTP_TCB_UNLOCK(stcb); 1863 SCTP_INP_INFO_WLOCK(); 1864 SCTP_INP_WLOCK(stcb->sctp_ep); 1865 SCTP_TCB_LOCK(stcb); 1866 atomic_add_int(&stcb->asoc.refcnt, -1); 1867 /* send up all the data */ 1868 SCTP_TCB_SEND_LOCK(stcb); 1869 1870 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1871 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1872 stcb->asoc.strmout[i].stream_no = i; 1873 stcb->asoc.strmout[i].next_sequence_sent = 0; 1874 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1875 } 1876 /* process the INIT-ACK info (my info) */ 1877 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1878 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1879 1880 /* pull from vtag hash */ 1881 LIST_REMOVE(stcb, sctp_asocs); 1882 /* re-insert to new vtag position */ 1883 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1884 SCTP_BASE_INFO(hashasocmark))]; 1885 /* 1886 * put it in the bucket in the vtag hash of assoc's for the 1887 * system 1888 */ 1889 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1890 1891 /* process the INIT info (peer's info) */ 1892 SCTP_TCB_SEND_UNLOCK(stcb); 1893 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1894 SCTP_INP_INFO_WUNLOCK(); 1895 1896 retval = sctp_process_init(init_cp, stcb, net); 1897 if (retval < 0) { 1898 if (how_indx < sizeof(asoc->cookie_how)) 1899 asoc->cookie_how[how_indx] = 13; 1900 1901 return (NULL); 1902 } 1903 /* 1904 * since we did not send a HB make sure we don't double 1905 * things 1906 */ 1907 net->hb_responded = 1; 1908 1909 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1910 init_offset + sizeof(struct sctp_init_chunk), 1911 initack_offset, sh, init_src)) { 1912 if (how_indx < sizeof(asoc->cookie_how)) 1913 asoc->cookie_how[how_indx] = 14; 1914 1915 return (NULL); 1916 } 1917 /* respond with a COOKIE-ACK */ 1918 sctp_stop_all_cookie_timers(stcb); 1919 sctp_toss_old_cookies(stcb, asoc); 1920 sctp_send_cookie_ack(stcb); 1921 if (how_indx < sizeof(asoc->cookie_how)) 1922 asoc->cookie_how[how_indx] = 15; 1923 1924 return (stcb); 1925 } 1926 if (how_indx < sizeof(asoc->cookie_how)) 1927 asoc->cookie_how[how_indx] = 16; 1928 /* all other cases... */ 1929 return (NULL); 1930 } 1931 1932 1933 /* 1934 * handle a state cookie for a new association m: input packet mbuf chain-- 1935 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1936 * and the cookie signature does not exist offset: offset into mbuf to the 1937 * cookie-echo chunk length: length of the cookie chunk to: where the init 1938 * was from returns a new TCB 1939 */ 1940 struct sctp_tcb * 1941 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1942 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1943 struct sctp_inpcb *inp, struct sctp_nets **netp, 1944 struct sockaddr *init_src, int *notification, 1945 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1946 uint32_t vrf_id, uint16_t port) 1947 { 1948 struct sctp_tcb *stcb; 1949 struct sctp_init_chunk *init_cp, init_buf; 1950 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1951 struct sockaddr_storage sa_store; 1952 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1953 struct sockaddr_in *sin; 1954 struct sockaddr_in6 *sin6; 1955 struct sctp_association *asoc; 1956 int chk_length; 1957 int init_offset, initack_offset, initack_limit; 1958 int retval; 1959 int error = 0; 1960 uint32_t old_tag; 1961 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1962 1963 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1964 struct socket *so; 1965 1966 so = SCTP_INP_SO(inp); 1967 #endif 1968 1969 /* 1970 * find and validate the INIT chunk in the cookie (peer's info) the 1971 * INIT should start after the cookie-echo header struct (chunk 1972 * header, state cookie header struct) 1973 */ 1974 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1975 init_cp = (struct sctp_init_chunk *) 1976 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1977 (uint8_t *) & init_buf); 1978 if (init_cp == NULL) { 1979 /* could not pull a INIT chunk in cookie */ 1980 SCTPDBG(SCTP_DEBUG_INPUT1, 1981 "process_cookie_new: could not pull INIT chunk hdr\n"); 1982 return (NULL); 1983 } 1984 chk_length = ntohs(init_cp->ch.chunk_length); 1985 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1986 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1987 return (NULL); 1988 } 1989 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1990 /* 1991 * find and validate the INIT-ACK chunk in the cookie (my info) the 1992 * INIT-ACK follows the INIT chunk 1993 */ 1994 initack_cp = (struct sctp_init_ack_chunk *) 1995 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1996 (uint8_t *) & initack_buf); 1997 if (initack_cp == NULL) { 1998 /* could not pull INIT-ACK chunk in cookie */ 1999 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2000 return (NULL); 2001 } 2002 chk_length = ntohs(initack_cp->ch.chunk_length); 2003 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2004 return (NULL); 2005 } 2006 /* 2007 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2008 * "initack_limit" value. This is because the chk_length field 2009 * includes the length of the cookie, but the cookie is omitted when 2010 * the INIT and INIT_ACK are tacked onto the cookie... 2011 */ 2012 initack_limit = offset + cookie_len; 2013 2014 /* 2015 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2016 * and popluate 2017 */ 2018 2019 /* 2020 * Here we do a trick, we set in NULL for the proc/thread argument. 2021 * We do this since in effect we only use the p argument when the 2022 * socket is unbound and we must do an implicit bind. Since we are 2023 * getting a cookie, we cannot be unbound. 2024 */ 2025 stcb = sctp_aloc_assoc(inp, init_src, &error, 2026 ntohl(initack_cp->init.initiate_tag), vrf_id, 2027 (struct thread *)NULL 2028 ); 2029 if (stcb == NULL) { 2030 struct mbuf *op_err; 2031 2032 /* memory problem? */ 2033 SCTPDBG(SCTP_DEBUG_INPUT1, 2034 "process_cookie_new: no room for another TCB!\n"); 2035 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2036 2037 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2038 sh, op_err, vrf_id, port); 2039 return (NULL); 2040 } 2041 /* get the correct sctp_nets */ 2042 if (netp) 2043 *netp = sctp_findnet(stcb, init_src); 2044 2045 asoc = &stcb->asoc; 2046 /* get scope variables out of cookie */ 2047 asoc->ipv4_local_scope = cookie->ipv4_scope; 2048 asoc->site_scope = cookie->site_scope; 2049 asoc->local_scope = cookie->local_scope; 2050 asoc->loopback_scope = cookie->loopback_scope; 2051 2052 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2053 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2054 struct mbuf *op_err; 2055 2056 /* 2057 * Houston we have a problem. The EP changed while the 2058 * cookie was in flight. Only recourse is to abort the 2059 * association. 2060 */ 2061 atomic_add_int(&stcb->asoc.refcnt, 1); 2062 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2063 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2064 sh, op_err, vrf_id, port); 2065 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2066 SCTP_TCB_UNLOCK(stcb); 2067 SCTP_SOCKET_LOCK(so, 1); 2068 SCTP_TCB_LOCK(stcb); 2069 #endif 2070 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2071 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2072 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2073 SCTP_SOCKET_UNLOCK(so, 1); 2074 #endif 2075 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2076 return (NULL); 2077 } 2078 /* process the INIT-ACK info (my info) */ 2079 old_tag = asoc->my_vtag; 2080 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2081 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2082 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2083 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2084 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2085 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2086 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2087 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2088 asoc->str_reset_seq_in = asoc->init_seq_number; 2089 2090 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2091 2092 /* process the INIT info (peer's info) */ 2093 if (netp) 2094 retval = sctp_process_init(init_cp, stcb, *netp); 2095 else 2096 retval = 0; 2097 if (retval < 0) { 2098 atomic_add_int(&stcb->asoc.refcnt, 1); 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, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2105 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2106 SCTP_SOCKET_UNLOCK(so, 1); 2107 #endif 2108 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2109 return (NULL); 2110 } 2111 /* load all addresses */ 2112 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2113 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2114 init_src)) { 2115 atomic_add_int(&stcb->asoc.refcnt, 1); 2116 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2117 SCTP_TCB_UNLOCK(stcb); 2118 SCTP_SOCKET_LOCK(so, 1); 2119 SCTP_TCB_LOCK(stcb); 2120 #endif 2121 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2122 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2123 SCTP_SOCKET_UNLOCK(so, 1); 2124 #endif 2125 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2126 return (NULL); 2127 } 2128 /* 2129 * verify any preceding AUTH chunk that was skipped 2130 */ 2131 /* pull the local authentication parameters from the cookie/init-ack */ 2132 sctp_auth_get_cookie_params(stcb, m, 2133 initack_offset + sizeof(struct sctp_init_ack_chunk), 2134 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2135 if (auth_skipped) { 2136 struct sctp_auth_chunk *auth; 2137 2138 auth = (struct sctp_auth_chunk *) 2139 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2140 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2141 /* auth HMAC failed, dump the assoc and packet */ 2142 SCTPDBG(SCTP_DEBUG_AUTH1, 2143 "COOKIE-ECHO: AUTH failed\n"); 2144 atomic_add_int(&stcb->asoc.refcnt, 1); 2145 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2146 SCTP_TCB_UNLOCK(stcb); 2147 SCTP_SOCKET_LOCK(so, 1); 2148 SCTP_TCB_LOCK(stcb); 2149 #endif 2150 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2151 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2152 SCTP_SOCKET_UNLOCK(so, 1); 2153 #endif 2154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2155 return (NULL); 2156 } else { 2157 /* remaining chunks checked... good to go */ 2158 stcb->asoc.authenticated = 1; 2159 } 2160 } 2161 /* update current state */ 2162 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2163 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2164 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2165 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2166 stcb->sctp_ep, stcb, asoc->primary_destination); 2167 } 2168 sctp_stop_all_cookie_timers(stcb); 2169 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2170 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2171 2172 /* 2173 * if we're doing ASCONFs, check to see if we have any new local 2174 * addresses that need to get added to the peer (eg. addresses 2175 * changed while cookie echo in flight). This needs to be done 2176 * after we go to the OPEN state to do the correct asconf 2177 * processing. else, make sure we have the correct addresses in our 2178 * lists 2179 */ 2180 2181 /* warning, we re-use sin, sin6, sa_store here! */ 2182 /* pull in local_address (our "from" address) */ 2183 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2184 /* source addr is IPv4 */ 2185 sin = (struct sockaddr_in *)initack_src; 2186 memset(sin, 0, sizeof(*sin)); 2187 sin->sin_family = AF_INET; 2188 sin->sin_len = sizeof(struct sockaddr_in); 2189 sin->sin_addr.s_addr = cookie->laddress[0]; 2190 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2191 /* source addr is IPv6 */ 2192 sin6 = (struct sockaddr_in6 *)initack_src; 2193 memset(sin6, 0, sizeof(*sin6)); 2194 sin6->sin6_family = AF_INET6; 2195 sin6->sin6_len = sizeof(struct sockaddr_in6); 2196 sin6->sin6_scope_id = cookie->scope_id; 2197 memcpy(&sin6->sin6_addr, cookie->laddress, 2198 sizeof(sin6->sin6_addr)); 2199 } else { 2200 atomic_add_int(&stcb->asoc.refcnt, 1); 2201 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_TCB_UNLOCK(stcb); 2203 SCTP_SOCKET_LOCK(so, 1); 2204 SCTP_TCB_LOCK(stcb); 2205 #endif 2206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2207 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209 #endif 2210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2211 return (NULL); 2212 } 2213 2214 /* set up to notify upper layer */ 2215 *notification = SCTP_NOTIFY_ASSOC_UP; 2216 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2217 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2218 (inp->sctp_socket->so_qlimit == 0)) { 2219 /* 2220 * This is an endpoint that called connect() how it got a 2221 * cookie that is NEW is a bit of a mystery. It must be that 2222 * the INIT was sent, but before it got there.. a complete 2223 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2224 * should have went to the other code.. not here.. oh well.. 2225 * a bit of protection is worth having.. 2226 */ 2227 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2228 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2229 atomic_add_int(&stcb->asoc.refcnt, 1); 2230 SCTP_TCB_UNLOCK(stcb); 2231 SCTP_SOCKET_LOCK(so, 1); 2232 SCTP_TCB_LOCK(stcb); 2233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2234 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2235 SCTP_SOCKET_UNLOCK(so, 1); 2236 return (NULL); 2237 } 2238 #endif 2239 soisconnected(stcb->sctp_socket); 2240 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2241 SCTP_SOCKET_UNLOCK(so, 1); 2242 #endif 2243 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2244 (inp->sctp_socket->so_qlimit)) { 2245 /* 2246 * We don't want to do anything with this one. Since it is 2247 * the listening guy. The timer will get started for 2248 * accepted connections in the caller. 2249 */ 2250 ; 2251 } 2252 /* since we did not send a HB make sure we don't double things */ 2253 if ((netp) && (*netp)) 2254 (*netp)->hb_responded = 1; 2255 2256 if (stcb->asoc.sctp_autoclose_ticks && 2257 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2258 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2259 } 2260 /* calculate the RTT */ 2261 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2262 if ((netp) && (*netp)) { 2263 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2264 &cookie->time_entered, sctp_align_unsafe_makecopy); 2265 } 2266 /* respond with a COOKIE-ACK */ 2267 sctp_send_cookie_ack(stcb); 2268 2269 /* 2270 * check the address lists for any ASCONFs that need to be sent 2271 * AFTER the cookie-ack is sent 2272 */ 2273 sctp_check_address_list(stcb, m, 2274 initack_offset + sizeof(struct sctp_init_ack_chunk), 2275 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2276 initack_src, cookie->local_scope, cookie->site_scope, 2277 cookie->ipv4_scope, cookie->loopback_scope); 2278 2279 2280 return (stcb); 2281 } 2282 2283 /* 2284 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2285 * we NEED to make sure we are not already using the vtag. If so we 2286 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2287 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2288 SCTP_BASE_INFO(hashasocmark))]; 2289 LIST_FOREACH(stcb, head, sctp_asocs) { 2290 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2291 -- SEND ABORT - TRY AGAIN -- 2292 } 2293 } 2294 */ 2295 2296 /* 2297 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2298 * existing (non-NULL) TCB 2299 */ 2300 static struct mbuf * 2301 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2302 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2303 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2304 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2305 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2306 { 2307 struct sctp_state_cookie *cookie; 2308 struct sockaddr_in6 sin6; 2309 struct sockaddr_in sin; 2310 struct sctp_tcb *l_stcb = *stcb; 2311 struct sctp_inpcb *l_inp; 2312 struct sockaddr *to; 2313 sctp_assoc_t sac_restart_id; 2314 struct sctp_pcb *ep; 2315 struct mbuf *m_sig; 2316 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2317 uint8_t *sig; 2318 uint8_t cookie_ok = 0; 2319 unsigned int size_of_pkt, sig_offset, cookie_offset; 2320 unsigned int cookie_len; 2321 struct timeval now; 2322 struct timeval time_expires; 2323 struct sockaddr_storage dest_store; 2324 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2325 struct ip *iph; 2326 int notification = 0; 2327 struct sctp_nets *netl; 2328 int had_a_existing_tcb = 0; 2329 2330 SCTPDBG(SCTP_DEBUG_INPUT2, 2331 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2332 2333 if (inp_p == NULL) { 2334 return (NULL); 2335 } 2336 /* First get the destination address setup too. */ 2337 iph = mtod(m, struct ip *); 2338 switch (iph->ip_v) { 2339 case IPVERSION: 2340 { 2341 /* its IPv4 */ 2342 struct sockaddr_in *lsin; 2343 2344 lsin = (struct sockaddr_in *)(localep_sa); 2345 memset(lsin, 0, sizeof(*lsin)); 2346 lsin->sin_family = AF_INET; 2347 lsin->sin_len = sizeof(*lsin); 2348 lsin->sin_port = sh->dest_port; 2349 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2350 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2351 break; 2352 } 2353 #ifdef INET6 2354 case IPV6_VERSION >> 4: 2355 { 2356 /* its IPv6 */ 2357 struct ip6_hdr *ip6; 2358 struct sockaddr_in6 *lsin6; 2359 2360 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2361 memset(lsin6, 0, sizeof(*lsin6)); 2362 lsin6->sin6_family = AF_INET6; 2363 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2364 ip6 = mtod(m, struct ip6_hdr *); 2365 lsin6->sin6_port = sh->dest_port; 2366 lsin6->sin6_addr = ip6->ip6_dst; 2367 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2368 break; 2369 } 2370 #endif 2371 default: 2372 return (NULL); 2373 } 2374 2375 cookie = &cp->cookie; 2376 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2377 cookie_len = ntohs(cp->ch.chunk_length); 2378 2379 if ((cookie->peerport != sh->src_port) && 2380 (cookie->myport != sh->dest_port) && 2381 (cookie->my_vtag != sh->v_tag)) { 2382 /* 2383 * invalid ports or bad tag. Note that we always leave the 2384 * v_tag in the header in network order and when we stored 2385 * it in the my_vtag slot we also left it in network order. 2386 * This maintains the match even though it may be in the 2387 * opposite byte order of the machine :-> 2388 */ 2389 return (NULL); 2390 } 2391 if (cookie_len > size_of_pkt || 2392 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2393 sizeof(struct sctp_init_chunk) + 2394 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2395 /* cookie too long! or too small */ 2396 return (NULL); 2397 } 2398 /* 2399 * split off the signature into its own mbuf (since it should not be 2400 * calculated in the sctp_hmac_m() call). 2401 */ 2402 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2403 if (sig_offset > size_of_pkt) { 2404 /* packet not correct size! */ 2405 /* XXX this may already be accounted for earlier... */ 2406 return (NULL); 2407 } 2408 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2409 if (m_sig == NULL) { 2410 /* out of memory or ?? */ 2411 return (NULL); 2412 } 2413 #ifdef SCTP_MBUF_LOGGING 2414 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2415 struct mbuf *mat; 2416 2417 mat = m_sig; 2418 while (mat) { 2419 if (SCTP_BUF_IS_EXTENDED(mat)) { 2420 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2421 } 2422 mat = SCTP_BUF_NEXT(mat); 2423 } 2424 } 2425 #endif 2426 2427 /* 2428 * compute the signature/digest for the cookie 2429 */ 2430 ep = &(*inp_p)->sctp_ep; 2431 l_inp = *inp_p; 2432 if (l_stcb) { 2433 SCTP_TCB_UNLOCK(l_stcb); 2434 } 2435 SCTP_INP_RLOCK(l_inp); 2436 if (l_stcb) { 2437 SCTP_TCB_LOCK(l_stcb); 2438 } 2439 /* which cookie is it? */ 2440 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2441 (ep->current_secret_number != ep->last_secret_number)) { 2442 /* it's the old cookie */ 2443 (void)sctp_hmac_m(SCTP_HMAC, 2444 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2445 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2446 } else { 2447 /* it's the current cookie */ 2448 (void)sctp_hmac_m(SCTP_HMAC, 2449 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2450 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2451 } 2452 /* get the signature */ 2453 SCTP_INP_RUNLOCK(l_inp); 2454 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2455 if (sig == NULL) { 2456 /* couldn't find signature */ 2457 sctp_m_freem(m_sig); 2458 return (NULL); 2459 } 2460 /* compare the received digest with the computed digest */ 2461 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2462 /* try the old cookie? */ 2463 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2464 (ep->current_secret_number != ep->last_secret_number)) { 2465 /* compute digest with old */ 2466 (void)sctp_hmac_m(SCTP_HMAC, 2467 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2468 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2469 /* compare */ 2470 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2471 cookie_ok = 1; 2472 } 2473 } else { 2474 cookie_ok = 1; 2475 } 2476 2477 /* 2478 * Now before we continue we must reconstruct our mbuf so that 2479 * normal processing of any other chunks will work. 2480 */ 2481 { 2482 struct mbuf *m_at; 2483 2484 m_at = m; 2485 while (SCTP_BUF_NEXT(m_at) != NULL) { 2486 m_at = SCTP_BUF_NEXT(m_at); 2487 } 2488 SCTP_BUF_NEXT(m_at) = m_sig; 2489 } 2490 2491 if (cookie_ok == 0) { 2492 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2493 SCTPDBG(SCTP_DEBUG_INPUT2, 2494 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2495 (uint32_t) offset, cookie_offset, sig_offset); 2496 return (NULL); 2497 } 2498 /* 2499 * check the cookie timestamps to be sure it's not stale 2500 */ 2501 (void)SCTP_GETTIME_TIMEVAL(&now); 2502 /* Expire time is in Ticks, so we convert to seconds */ 2503 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2504 time_expires.tv_usec = cookie->time_entered.tv_usec; 2505 /* 2506 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2507 * is undefined. 2508 */ 2509 if (timevalcmp(&now, &time_expires, >)) { 2510 /* cookie is stale! */ 2511 struct mbuf *op_err; 2512 struct sctp_stale_cookie_msg *scm; 2513 uint32_t tim; 2514 2515 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2516 0, M_DONTWAIT, 1, MT_DATA); 2517 if (op_err == NULL) { 2518 /* FOOBAR */ 2519 return (NULL); 2520 } 2521 /* Set the len */ 2522 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2523 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2524 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2525 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2526 (sizeof(uint32_t)))); 2527 /* seconds to usec */ 2528 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2529 /* add in usec */ 2530 if (tim == 0) 2531 tim = now.tv_usec - cookie->time_entered.tv_usec; 2532 scm->time_usec = htonl(tim); 2533 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2534 vrf_id, port); 2535 return (NULL); 2536 } 2537 /* 2538 * Now we must see with the lookup address if we have an existing 2539 * asoc. This will only happen if we were in the COOKIE-WAIT state 2540 * and a INIT collided with us and somewhere the peer sent the 2541 * cookie on another address besides the single address our assoc 2542 * had for him. In this case we will have one of the tie-tags set at 2543 * least AND the address field in the cookie can be used to look it 2544 * up. 2545 */ 2546 to = NULL; 2547 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2548 memset(&sin6, 0, sizeof(sin6)); 2549 sin6.sin6_family = AF_INET6; 2550 sin6.sin6_len = sizeof(sin6); 2551 sin6.sin6_port = sh->src_port; 2552 sin6.sin6_scope_id = cookie->scope_id; 2553 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2554 sizeof(sin6.sin6_addr.s6_addr)); 2555 to = (struct sockaddr *)&sin6; 2556 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2557 memset(&sin, 0, sizeof(sin)); 2558 sin.sin_family = AF_INET; 2559 sin.sin_len = sizeof(sin); 2560 sin.sin_port = sh->src_port; 2561 sin.sin_addr.s_addr = cookie->address[0]; 2562 to = (struct sockaddr *)&sin; 2563 } else { 2564 /* This should not happen */ 2565 return (NULL); 2566 } 2567 if ((*stcb == NULL) && to) { 2568 /* Yep, lets check */ 2569 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2570 if (*stcb == NULL) { 2571 /* 2572 * We should have only got back the same inp. If we 2573 * got back a different ep we have a problem. The 2574 * original findep got back l_inp and now 2575 */ 2576 if (l_inp != *inp_p) { 2577 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2578 } 2579 } else { 2580 if (*locked_tcb == NULL) { 2581 /* 2582 * In this case we found the assoc only 2583 * after we locked the create lock. This 2584 * means we are in a colliding case and we 2585 * must make sure that we unlock the tcb if 2586 * its one of the cases where we throw away 2587 * the incoming packets. 2588 */ 2589 *locked_tcb = *stcb; 2590 2591 /* 2592 * We must also increment the inp ref count 2593 * since the ref_count flags was set when we 2594 * did not find the TCB, now we found it 2595 * which reduces the refcount.. we must 2596 * raise it back out to balance it all :-) 2597 */ 2598 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2599 if ((*stcb)->sctp_ep != l_inp) { 2600 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2601 (*stcb)->sctp_ep, l_inp); 2602 } 2603 } 2604 } 2605 } 2606 if (to == NULL) { 2607 return (NULL); 2608 } 2609 cookie_len -= SCTP_SIGNATURE_SIZE; 2610 if (*stcb == NULL) { 2611 /* this is the "normal" case... get a new TCB */ 2612 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2613 cookie_len, *inp_p, netp, to, ¬ification, 2614 auth_skipped, auth_offset, auth_len, vrf_id, port); 2615 } else { 2616 /* this is abnormal... cookie-echo on existing TCB */ 2617 had_a_existing_tcb = 1; 2618 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2619 cookie, cookie_len, *inp_p, *stcb, netp, to, 2620 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2621 } 2622 2623 if (*stcb == NULL) { 2624 /* still no TCB... must be bad cookie-echo */ 2625 return (NULL); 2626 } 2627 /* 2628 * Ok, we built an association so confirm the address we sent the 2629 * INIT-ACK to. 2630 */ 2631 netl = sctp_findnet(*stcb, to); 2632 /* 2633 * This code should in theory NOT run but 2634 */ 2635 if (netl == NULL) { 2636 /* TSNH! Huh, why do I need to add this address here? */ 2637 int ret; 2638 2639 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2640 SCTP_IN_COOKIE_PROC); 2641 netl = sctp_findnet(*stcb, to); 2642 } 2643 if (netl) { 2644 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2645 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2646 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2647 netl); 2648 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2649 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2650 } 2651 } 2652 if (*stcb) { 2653 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2654 *stcb, NULL); 2655 } 2656 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2657 if (!had_a_existing_tcb || 2658 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2659 /* 2660 * If we have a NEW cookie or the connect never 2661 * reached the connected state during collision we 2662 * must do the TCP accept thing. 2663 */ 2664 struct socket *so, *oso; 2665 struct sctp_inpcb *inp; 2666 2667 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2668 /* 2669 * For a restart we will keep the same 2670 * socket, no need to do anything. I THINK!! 2671 */ 2672 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2673 return (m); 2674 } 2675 oso = (*inp_p)->sctp_socket; 2676 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2677 SCTP_TCB_UNLOCK((*stcb)); 2678 so = sonewconn(oso, 0 2679 ); 2680 SCTP_TCB_LOCK((*stcb)); 2681 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2682 2683 if (so == NULL) { 2684 struct mbuf *op_err; 2685 2686 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2687 struct socket *pcb_so; 2688 2689 #endif 2690 /* Too many sockets */ 2691 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2692 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2693 sctp_abort_association(*inp_p, NULL, m, iphlen, 2694 sh, op_err, vrf_id, port); 2695 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2696 pcb_so = SCTP_INP_SO(*inp_p); 2697 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2698 SCTP_TCB_UNLOCK((*stcb)); 2699 SCTP_SOCKET_LOCK(pcb_so, 1); 2700 SCTP_TCB_LOCK((*stcb)); 2701 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2702 #endif 2703 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2704 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2705 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2706 #endif 2707 return (NULL); 2708 } 2709 inp = (struct sctp_inpcb *)so->so_pcb; 2710 SCTP_INP_INCR_REF(inp); 2711 /* 2712 * We add the unbound flag here so that if we get an 2713 * soabort() before we get the move_pcb done, we 2714 * will properly cleanup. 2715 */ 2716 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2717 SCTP_PCB_FLAGS_CONNECTED | 2718 SCTP_PCB_FLAGS_IN_TCPPOOL | 2719 SCTP_PCB_FLAGS_UNBOUND | 2720 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2721 SCTP_PCB_FLAGS_DONT_WAKE); 2722 inp->sctp_features = (*inp_p)->sctp_features; 2723 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2724 inp->sctp_socket = so; 2725 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2726 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2727 inp->sctp_context = (*inp_p)->sctp_context; 2728 inp->inp_starting_point_for_iterator = NULL; 2729 /* 2730 * copy in the authentication parameters from the 2731 * original endpoint 2732 */ 2733 if (inp->sctp_ep.local_hmacs) 2734 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2735 inp->sctp_ep.local_hmacs = 2736 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2737 if (inp->sctp_ep.local_auth_chunks) 2738 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2739 inp->sctp_ep.local_auth_chunks = 2740 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2741 2742 /* 2743 * Now we must move it from one hash table to 2744 * another and get the tcb in the right place. 2745 */ 2746 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2747 2748 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2749 SCTP_TCB_UNLOCK((*stcb)); 2750 2751 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2752 0); 2753 SCTP_TCB_LOCK((*stcb)); 2754 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2755 2756 2757 /* 2758 * now we must check to see if we were aborted while 2759 * the move was going on and the lock/unlock 2760 * happened. 2761 */ 2762 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2763 /* 2764 * yep it was, we leave the assoc attached 2765 * to the socket since the sctp_inpcb_free() 2766 * call will send an abort for us. 2767 */ 2768 SCTP_INP_DECR_REF(inp); 2769 return (NULL); 2770 } 2771 SCTP_INP_DECR_REF(inp); 2772 /* Switch over to the new guy */ 2773 *inp_p = inp; 2774 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2775 2776 /* 2777 * Pull it from the incomplete queue and wake the 2778 * guy 2779 */ 2780 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2781 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2782 SCTP_TCB_UNLOCK((*stcb)); 2783 SCTP_SOCKET_LOCK(so, 1); 2784 #endif 2785 soisconnected(so); 2786 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2787 SCTP_TCB_LOCK((*stcb)); 2788 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2789 SCTP_SOCKET_UNLOCK(so, 1); 2790 #endif 2791 return (m); 2792 } 2793 } 2794 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2795 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2796 } 2797 return (m); 2798 } 2799 2800 static void 2801 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2802 struct sctp_tcb *stcb, struct sctp_nets *net) 2803 { 2804 /* cp must not be used, others call this without a c-ack :-) */ 2805 struct sctp_association *asoc; 2806 2807 SCTPDBG(SCTP_DEBUG_INPUT2, 2808 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2809 if (stcb == NULL) 2810 return; 2811 2812 asoc = &stcb->asoc; 2813 2814 sctp_stop_all_cookie_timers(stcb); 2815 /* process according to association state */ 2816 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2817 /* state change only needed when I am in right state */ 2818 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2819 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2820 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2821 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2822 stcb->sctp_ep, stcb, asoc->primary_destination); 2823 2824 } 2825 /* update RTO */ 2826 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2827 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2828 if (asoc->overall_error_count == 0) { 2829 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2830 &asoc->time_entered, sctp_align_safe_nocopy); 2831 } 2832 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2833 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2834 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2835 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2836 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2837 struct socket *so; 2838 2839 #endif 2840 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2841 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2842 so = SCTP_INP_SO(stcb->sctp_ep); 2843 atomic_add_int(&stcb->asoc.refcnt, 1); 2844 SCTP_TCB_UNLOCK(stcb); 2845 SCTP_SOCKET_LOCK(so, 1); 2846 SCTP_TCB_LOCK(stcb); 2847 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2848 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2849 SCTP_SOCKET_UNLOCK(so, 1); 2850 return; 2851 } 2852 #endif 2853 soisconnected(stcb->sctp_socket); 2854 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2855 SCTP_SOCKET_UNLOCK(so, 1); 2856 #endif 2857 } 2858 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2859 stcb, net); 2860 /* 2861 * since we did not send a HB make sure we don't double 2862 * things 2863 */ 2864 net->hb_responded = 1; 2865 2866 if (stcb->asoc.sctp_autoclose_ticks && 2867 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2868 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2869 stcb->sctp_ep, stcb, NULL); 2870 } 2871 /* 2872 * send ASCONF if parameters are pending and ASCONFs are 2873 * allowed (eg. addresses changed when init/cookie echo were 2874 * in flight) 2875 */ 2876 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2877 (stcb->asoc.peer_supports_asconf) && 2878 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2879 #ifdef SCTP_TIMER_BASED_ASCONF 2880 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2881 stcb->sctp_ep, stcb, 2882 stcb->asoc.primary_destination); 2883 #else 2884 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2885 SCTP_ADDR_NOT_LOCKED); 2886 #endif 2887 } 2888 } 2889 /* Toss the cookie if I can */ 2890 sctp_toss_old_cookies(stcb, asoc); 2891 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2892 /* Restart the timer if we have pending data */ 2893 struct sctp_tmit_chunk *chk; 2894 2895 chk = TAILQ_FIRST(&asoc->sent_queue); 2896 if (chk) { 2897 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2898 stcb, chk->whoTo); 2899 } 2900 } 2901 } 2902 2903 static void 2904 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2905 struct sctp_tcb *stcb) 2906 { 2907 struct sctp_nets *net; 2908 struct sctp_tmit_chunk *lchk; 2909 uint32_t tsn; 2910 2911 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2912 return; 2913 } 2914 SCTP_STAT_INCR(sctps_recvecne); 2915 tsn = ntohl(cp->tsn); 2916 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2917 /* Also we make sure we disable the nonce_wait */ 2918 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2919 if (lchk == NULL) { 2920 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2921 } else { 2922 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2923 } 2924 stcb->asoc.nonce_wait_for_ecne = 0; 2925 stcb->asoc.nonce_sum_check = 0; 2926 2927 /* Find where it was sent, if possible */ 2928 net = NULL; 2929 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2930 while (lchk) { 2931 if (lchk->rec.data.TSN_seq == tsn) { 2932 net = lchk->whoTo; 2933 break; 2934 } 2935 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2936 break; 2937 lchk = TAILQ_NEXT(lchk, sctp_next); 2938 } 2939 if (net == NULL) 2940 /* default is we use the primary */ 2941 net = stcb->asoc.primary_destination; 2942 2943 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2944 /* 2945 * JRS - Use the congestion control given in the pluggable 2946 * CC module 2947 */ 2948 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2949 /* 2950 * we reduce once every RTT. So we will only lower cwnd at 2951 * the next sending seq i.e. the resync_tsn. 2952 */ 2953 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2954 } 2955 /* 2956 * We always send a CWR this way if our previous one was lost our 2957 * peer will get an update, or if it is not time again to reduce we 2958 * still get the cwr to the peer. 2959 */ 2960 sctp_send_cwr(stcb, net, tsn); 2961 } 2962 2963 static void 2964 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2965 { 2966 /* 2967 * Here we get a CWR from the peer. We must look in the outqueue and 2968 * make sure that we have a covered ECNE in teh control chunk part. 2969 * If so remove it. 2970 */ 2971 struct sctp_tmit_chunk *chk; 2972 struct sctp_ecne_chunk *ecne; 2973 2974 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2975 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2976 continue; 2977 } 2978 /* 2979 * Look for and remove if it is the right TSN. Since there 2980 * is only ONE ECNE on the control queue at any one time we 2981 * don't need to worry about more than one! 2982 */ 2983 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2984 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2985 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2986 /* this covers this ECNE, we can remove it */ 2987 stcb->asoc.ecn_echo_cnt_onq--; 2988 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2989 sctp_next); 2990 if (chk->data) { 2991 sctp_m_freem(chk->data); 2992 chk->data = NULL; 2993 } 2994 stcb->asoc.ctrl_queue_cnt--; 2995 sctp_free_a_chunk(stcb, chk); 2996 break; 2997 } 2998 } 2999 } 3000 3001 static void 3002 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3003 struct sctp_tcb *stcb, struct sctp_nets *net) 3004 { 3005 struct sctp_association *asoc; 3006 3007 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3008 struct socket *so; 3009 3010 #endif 3011 3012 SCTPDBG(SCTP_DEBUG_INPUT2, 3013 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3014 if (stcb == NULL) 3015 return; 3016 3017 asoc = &stcb->asoc; 3018 /* process according to association state */ 3019 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3020 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3021 SCTPDBG(SCTP_DEBUG_INPUT2, 3022 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3023 SCTP_TCB_UNLOCK(stcb); 3024 return; 3025 } 3026 /* notify upper layer protocol */ 3027 if (stcb->sctp_socket) { 3028 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3029 /* are the queues empty? they should be */ 3030 if (!TAILQ_EMPTY(&asoc->send_queue) || 3031 !TAILQ_EMPTY(&asoc->sent_queue) || 3032 !TAILQ_EMPTY(&asoc->out_wheel)) { 3033 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3034 } 3035 } 3036 /* stop the timer */ 3037 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3038 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3039 /* free the TCB */ 3040 SCTPDBG(SCTP_DEBUG_INPUT2, 3041 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3042 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3043 so = SCTP_INP_SO(stcb->sctp_ep); 3044 atomic_add_int(&stcb->asoc.refcnt, 1); 3045 SCTP_TCB_UNLOCK(stcb); 3046 SCTP_SOCKET_LOCK(so, 1); 3047 SCTP_TCB_LOCK(stcb); 3048 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3049 #endif 3050 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3051 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3052 SCTP_SOCKET_UNLOCK(so, 1); 3053 #endif 3054 return; 3055 } 3056 3057 static int 3058 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3059 struct sctp_nets *net, uint8_t flg) 3060 { 3061 switch (desc->chunk_type) { 3062 case SCTP_DATA: 3063 /* find the tsn to resend (possibly */ 3064 { 3065 uint32_t tsn; 3066 struct sctp_tmit_chunk *tp1; 3067 3068 tsn = ntohl(desc->tsn_ifany); 3069 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3070 while (tp1) { 3071 if (tp1->rec.data.TSN_seq == tsn) { 3072 /* found it */ 3073 break; 3074 } 3075 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3076 MAX_TSN)) { 3077 /* not found */ 3078 tp1 = NULL; 3079 break; 3080 } 3081 tp1 = TAILQ_NEXT(tp1, sctp_next); 3082 } 3083 if (tp1 == NULL) { 3084 /* 3085 * Do it the other way , aka without paying 3086 * attention to queue seq order. 3087 */ 3088 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3089 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3090 while (tp1) { 3091 if (tp1->rec.data.TSN_seq == tsn) { 3092 /* found it */ 3093 break; 3094 } 3095 tp1 = TAILQ_NEXT(tp1, sctp_next); 3096 } 3097 } 3098 if (tp1 == NULL) { 3099 SCTP_STAT_INCR(sctps_pdrptsnnf); 3100 } 3101 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3102 uint8_t *ddp; 3103 3104 if ((stcb->asoc.peers_rwnd == 0) && 3105 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3106 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3107 return (0); 3108 } 3109 if (stcb->asoc.peers_rwnd == 0 && 3110 (flg & SCTP_FROM_MIDDLE_BOX)) { 3111 SCTP_STAT_INCR(sctps_pdrpdizrw); 3112 return (0); 3113 } 3114 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3115 sizeof(struct sctp_data_chunk)); 3116 { 3117 unsigned int iii; 3118 3119 for (iii = 0; iii < sizeof(desc->data_bytes); 3120 iii++) { 3121 if (ddp[iii] != desc->data_bytes[iii]) { 3122 SCTP_STAT_INCR(sctps_pdrpbadd); 3123 return (-1); 3124 } 3125 } 3126 } 3127 /* 3128 * We zero out the nonce so resync not 3129 * needed 3130 */ 3131 tp1->rec.data.ect_nonce = 0; 3132 3133 if (tp1->do_rtt) { 3134 /* 3135 * this guy had a RTO calculation 3136 * pending on it, cancel it 3137 */ 3138 tp1->do_rtt = 0; 3139 } 3140 SCTP_STAT_INCR(sctps_pdrpmark); 3141 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3142 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3143 tp1->sent = SCTP_DATAGRAM_RESEND; 3144 /* 3145 * mark it as if we were doing a FR, since 3146 * we will be getting gap ack reports behind 3147 * the info from the router. 3148 */ 3149 tp1->rec.data.doing_fast_retransmit = 1; 3150 /* 3151 * mark the tsn with what sequences can 3152 * cause a new FR. 3153 */ 3154 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3155 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3156 } else { 3157 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3158 } 3159 3160 /* restart the timer */ 3161 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3162 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3163 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3164 stcb, tp1->whoTo); 3165 3166 /* fix counts and things */ 3167 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3168 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3169 tp1->whoTo->flight_size, 3170 tp1->book_size, 3171 (uintptr_t) stcb, 3172 tp1->rec.data.TSN_seq); 3173 } 3174 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3175 sctp_flight_size_decrease(tp1); 3176 sctp_total_flight_decrease(stcb, tp1); 3177 } 3178 } { 3179 /* audit code */ 3180 unsigned int audit; 3181 3182 audit = 0; 3183 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3184 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3185 audit++; 3186 } 3187 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3188 sctp_next) { 3189 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3190 audit++; 3191 } 3192 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3193 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3194 audit, stcb->asoc.sent_queue_retran_cnt); 3195 #ifndef SCTP_AUDITING_ENABLED 3196 stcb->asoc.sent_queue_retran_cnt = audit; 3197 #endif 3198 } 3199 } 3200 } 3201 break; 3202 case SCTP_ASCONF: 3203 { 3204 struct sctp_tmit_chunk *asconf; 3205 3206 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3207 sctp_next) { 3208 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3209 break; 3210 } 3211 } 3212 if (asconf) { 3213 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3214 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3215 asconf->sent = SCTP_DATAGRAM_RESEND; 3216 asconf->snd_count--; 3217 } 3218 } 3219 break; 3220 case SCTP_INITIATION: 3221 /* resend the INIT */ 3222 stcb->asoc.dropped_special_cnt++; 3223 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3224 /* 3225 * If we can get it in, in a few attempts we do 3226 * this, otherwise we let the timer fire. 3227 */ 3228 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3229 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3230 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3231 } 3232 break; 3233 case SCTP_SELECTIVE_ACK: 3234 case SCTP_NR_SELECTIVE_ACK: 3235 /* resend the sack */ 3236 sctp_send_sack(stcb); 3237 break; 3238 case SCTP_HEARTBEAT_REQUEST: 3239 /* resend a demand HB */ 3240 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3241 /* 3242 * Only retransmit if we KNOW we wont destroy the 3243 * tcb 3244 */ 3245 (void)sctp_send_hb(stcb, 1, net); 3246 } 3247 break; 3248 case SCTP_SHUTDOWN: 3249 sctp_send_shutdown(stcb, net); 3250 break; 3251 case SCTP_SHUTDOWN_ACK: 3252 sctp_send_shutdown_ack(stcb, net); 3253 break; 3254 case SCTP_COOKIE_ECHO: 3255 { 3256 struct sctp_tmit_chunk *cookie; 3257 3258 cookie = NULL; 3259 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3260 sctp_next) { 3261 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3262 break; 3263 } 3264 } 3265 if (cookie) { 3266 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3267 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3268 cookie->sent = SCTP_DATAGRAM_RESEND; 3269 sctp_stop_all_cookie_timers(stcb); 3270 } 3271 } 3272 break; 3273 case SCTP_COOKIE_ACK: 3274 sctp_send_cookie_ack(stcb); 3275 break; 3276 case SCTP_ASCONF_ACK: 3277 /* resend last asconf ack */ 3278 sctp_send_asconf_ack(stcb); 3279 break; 3280 case SCTP_FORWARD_CUM_TSN: 3281 send_forward_tsn(stcb, &stcb->asoc); 3282 break; 3283 /* can't do anything with these */ 3284 case SCTP_PACKET_DROPPED: 3285 case SCTP_INITIATION_ACK: /* this should not happen */ 3286 case SCTP_HEARTBEAT_ACK: 3287 case SCTP_ABORT_ASSOCIATION: 3288 case SCTP_OPERATION_ERROR: 3289 case SCTP_SHUTDOWN_COMPLETE: 3290 case SCTP_ECN_ECHO: 3291 case SCTP_ECN_CWR: 3292 default: 3293 break; 3294 } 3295 return (0); 3296 } 3297 3298 void 3299 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3300 { 3301 int i; 3302 uint16_t temp; 3303 3304 /* 3305 * We set things to 0xffff since this is the last delivered sequence 3306 * and we will be sending in 0 after the reset. 3307 */ 3308 3309 if (number_entries) { 3310 for (i = 0; i < number_entries; i++) { 3311 temp = ntohs(list[i]); 3312 if (temp >= stcb->asoc.streamincnt) { 3313 continue; 3314 } 3315 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3316 } 3317 } else { 3318 list = NULL; 3319 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3320 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3321 } 3322 } 3323 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3324 } 3325 3326 static void 3327 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3328 { 3329 int i; 3330 3331 if (number_entries == 0) { 3332 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3333 stcb->asoc.strmout[i].next_sequence_sent = 0; 3334 } 3335 } else if (number_entries) { 3336 for (i = 0; i < number_entries; i++) { 3337 uint16_t temp; 3338 3339 temp = ntohs(list[i]); 3340 if (temp >= stcb->asoc.streamoutcnt) { 3341 /* no such stream */ 3342 continue; 3343 } 3344 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3345 } 3346 } 3347 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3348 } 3349 3350 3351 struct sctp_stream_reset_out_request * 3352 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3353 { 3354 struct sctp_association *asoc; 3355 struct sctp_stream_reset_out_req *req; 3356 struct sctp_stream_reset_out_request *r; 3357 struct sctp_tmit_chunk *chk; 3358 int len, clen; 3359 3360 asoc = &stcb->asoc; 3361 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3362 asoc->stream_reset_outstanding = 0; 3363 return (NULL); 3364 } 3365 if (stcb->asoc.str_reset == NULL) { 3366 asoc->stream_reset_outstanding = 0; 3367 return (NULL); 3368 } 3369 chk = stcb->asoc.str_reset; 3370 if (chk->data == NULL) { 3371 return (NULL); 3372 } 3373 if (bchk) { 3374 /* he wants a copy of the chk pointer */ 3375 *bchk = chk; 3376 } 3377 clen = chk->send_size; 3378 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3379 r = &req->sr_req; 3380 if (ntohl(r->request_seq) == seq) { 3381 /* found it */ 3382 return (r); 3383 } 3384 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3385 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3386 /* move to the next one, there can only be a max of two */ 3387 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3388 if (ntohl(r->request_seq) == seq) { 3389 return (r); 3390 } 3391 } 3392 /* that seq is not here */ 3393 return (NULL); 3394 } 3395 3396 static void 3397 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3398 { 3399 struct sctp_association *asoc; 3400 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3401 3402 if (stcb->asoc.str_reset == NULL) { 3403 return; 3404 } 3405 asoc = &stcb->asoc; 3406 3407 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3408 TAILQ_REMOVE(&asoc->control_send_queue, 3409 chk, 3410 sctp_next); 3411 if (chk->data) { 3412 sctp_m_freem(chk->data); 3413 chk->data = NULL; 3414 } 3415 asoc->ctrl_queue_cnt--; 3416 sctp_free_a_chunk(stcb, chk); 3417 /* sa_ignore NO_NULL_CHK */ 3418 stcb->asoc.str_reset = NULL; 3419 } 3420 3421 3422 static int 3423 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3424 uint32_t seq, uint32_t action, 3425 struct sctp_stream_reset_response *respin) 3426 { 3427 uint16_t type; 3428 int lparm_len; 3429 struct sctp_association *asoc = &stcb->asoc; 3430 struct sctp_tmit_chunk *chk; 3431 struct sctp_stream_reset_out_request *srparam; 3432 int number_entries; 3433 3434 if (asoc->stream_reset_outstanding == 0) { 3435 /* duplicate */ 3436 return (0); 3437 } 3438 if (seq == stcb->asoc.str_reset_seq_out) { 3439 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3440 if (srparam) { 3441 stcb->asoc.str_reset_seq_out++; 3442 type = ntohs(srparam->ph.param_type); 3443 lparm_len = ntohs(srparam->ph.param_length); 3444 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3445 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3446 asoc->stream_reset_out_is_outstanding = 0; 3447 if (asoc->stream_reset_outstanding) 3448 asoc->stream_reset_outstanding--; 3449 if (action == SCTP_STREAM_RESET_PERFORMED) { 3450 /* do it */ 3451 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3452 } else { 3453 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3454 } 3455 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3456 /* Answered my request */ 3457 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3458 if (asoc->stream_reset_outstanding) 3459 asoc->stream_reset_outstanding--; 3460 if (action != SCTP_STREAM_RESET_PERFORMED) { 3461 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3462 } 3463 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3464 /* Ok we now may have more streams */ 3465 if (asoc->stream_reset_outstanding) 3466 asoc->stream_reset_outstanding--; 3467 if (action == SCTP_STREAM_RESET_PERFORMED) { 3468 /* Put the new streams into effect */ 3469 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3470 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3471 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3472 } else { 3473 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3474 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3475 } 3476 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3477 /** 3478 * a) Adopt the new in tsn. 3479 * b) reset the map 3480 * c) Adopt the new out-tsn 3481 */ 3482 struct sctp_stream_reset_response_tsn *resp; 3483 struct sctp_forward_tsn_chunk fwdtsn; 3484 int abort_flag = 0; 3485 3486 if (respin == NULL) { 3487 /* huh ? */ 3488 return (0); 3489 } 3490 if (action == SCTP_STREAM_RESET_PERFORMED) { 3491 resp = (struct sctp_stream_reset_response_tsn *)respin; 3492 asoc->stream_reset_outstanding--; 3493 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3494 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3495 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3496 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3497 if (abort_flag) { 3498 return (1); 3499 } 3500 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3501 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3502 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3503 } 3504 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3505 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3506 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3507 3508 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3509 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3510 3511 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3512 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3513 3514 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3515 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3516 3517 } 3518 } 3519 /* get rid of the request and get the request flags */ 3520 if (asoc->stream_reset_outstanding == 0) { 3521 sctp_clean_up_stream_reset(stcb); 3522 } 3523 } 3524 } 3525 return (0); 3526 } 3527 3528 static void 3529 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3530 struct sctp_tmit_chunk *chk, 3531 struct sctp_stream_reset_in_request *req, int trunc) 3532 { 3533 uint32_t seq; 3534 int len, i; 3535 int number_entries; 3536 uint16_t temp; 3537 3538 /* 3539 * peer wants me to send a str-reset to him for my outgoing seq's if 3540 * seq_in is right. 3541 */ 3542 struct sctp_association *asoc = &stcb->asoc; 3543 3544 seq = ntohl(req->request_seq); 3545 if (asoc->str_reset_seq_in == seq) { 3546 if (trunc) { 3547 /* Can't do it, since they exceeded our buffer size */ 3548 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3549 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3550 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3551 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3552 len = ntohs(req->ph.param_length); 3553 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3554 for (i = 0; i < number_entries; i++) { 3555 temp = ntohs(req->list_of_streams[i]); 3556 req->list_of_streams[i] = temp; 3557 } 3558 /* move the reset action back one */ 3559 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3560 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3561 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3562 asoc->str_reset_seq_out, 3563 seq, (asoc->sending_seq - 1)); 3564 asoc->stream_reset_out_is_outstanding = 1; 3565 asoc->str_reset = chk; 3566 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3567 stcb->asoc.stream_reset_outstanding++; 3568 } else { 3569 /* Can't do it, since we have sent one out */ 3570 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3571 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3572 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3573 } 3574 asoc->str_reset_seq_in++; 3575 } else if (asoc->str_reset_seq_in - 1 == seq) { 3576 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3577 } else if (asoc->str_reset_seq_in - 2 == seq) { 3578 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3579 } else { 3580 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3581 } 3582 } 3583 3584 static int 3585 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3586 struct sctp_tmit_chunk *chk, 3587 struct sctp_stream_reset_tsn_request *req) 3588 { 3589 /* reset all in and out and update the tsn */ 3590 /* 3591 * A) reset my str-seq's on in and out. B) Select a receive next, 3592 * and set cum-ack to it. Also process this selected number as a 3593 * fwd-tsn as well. C) set in the response my next sending seq. 3594 */ 3595 struct sctp_forward_tsn_chunk fwdtsn; 3596 struct sctp_association *asoc = &stcb->asoc; 3597 int abort_flag = 0; 3598 uint32_t seq; 3599 3600 seq = ntohl(req->request_seq); 3601 if (asoc->str_reset_seq_in == seq) { 3602 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3603 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3604 fwdtsn.ch.chunk_flags = 0; 3605 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3606 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3607 if (abort_flag) { 3608 return (1); 3609 } 3610 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3611 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3612 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3613 } 3614 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3615 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3616 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3617 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3618 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3619 atomic_add_int(&stcb->asoc.sending_seq, 1); 3620 /* save off historical data for retrans */ 3621 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3622 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3623 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3624 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3625 3626 sctp_add_stream_reset_result_tsn(chk, 3627 ntohl(req->request_seq), 3628 SCTP_STREAM_RESET_PERFORMED, 3629 stcb->asoc.sending_seq, 3630 stcb->asoc.mapping_array_base_tsn); 3631 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3632 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3633 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3634 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3635 3636 asoc->str_reset_seq_in++; 3637 } else if (asoc->str_reset_seq_in - 1 == seq) { 3638 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3639 stcb->asoc.last_sending_seq[0], 3640 stcb->asoc.last_base_tsnsent[0] 3641 ); 3642 } else if (asoc->str_reset_seq_in - 2 == seq) { 3643 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3644 stcb->asoc.last_sending_seq[1], 3645 stcb->asoc.last_base_tsnsent[1] 3646 ); 3647 } else { 3648 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3649 } 3650 return (0); 3651 } 3652 3653 static void 3654 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3655 struct sctp_tmit_chunk *chk, 3656 struct sctp_stream_reset_out_request *req, int trunc) 3657 { 3658 uint32_t seq, tsn; 3659 int number_entries, len; 3660 struct sctp_association *asoc = &stcb->asoc; 3661 3662 seq = ntohl(req->request_seq); 3663 3664 /* now if its not a duplicate we process it */ 3665 if (asoc->str_reset_seq_in == seq) { 3666 len = ntohs(req->ph.param_length); 3667 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3668 /* 3669 * the sender is resetting, handle the list issue.. we must 3670 * a) verify if we can do the reset, if so no problem b) If 3671 * we can't do the reset we must copy the request. c) queue 3672 * it, and setup the data in processor to trigger it off 3673 * when needed and dequeue all the queued data. 3674 */ 3675 tsn = ntohl(req->send_reset_at_tsn); 3676 3677 /* move the reset action back one */ 3678 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3679 if (trunc) { 3680 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3681 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3682 } else if ((tsn == asoc->cumulative_tsn) || 3683 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3684 /* we can do it now */ 3685 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3686 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3687 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3688 } else { 3689 /* 3690 * we must queue it up and thus wait for the TSN's 3691 * to arrive that are at or before tsn 3692 */ 3693 struct sctp_stream_reset_list *liste; 3694 int siz; 3695 3696 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3697 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3698 siz, SCTP_M_STRESET); 3699 if (liste == NULL) { 3700 /* gak out of memory */ 3701 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3702 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3703 return; 3704 } 3705 liste->tsn = tsn; 3706 liste->number_entries = number_entries; 3707 memcpy(&liste->req, req, 3708 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3709 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3710 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3711 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3712 } 3713 asoc->str_reset_seq_in++; 3714 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3715 /* 3716 * one seq back, just echo back last action since my 3717 * response was lost. 3718 */ 3719 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3720 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3721 /* 3722 * two seq back, just echo back last action since my 3723 * response was lost. 3724 */ 3725 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3726 } else { 3727 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3728 } 3729 } 3730 3731 static void 3732 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3733 struct sctp_stream_reset_add_strm *str_add) 3734 { 3735 /* 3736 * Peer is requesting to add more streams. If its within our 3737 * max-streams we will allow it. 3738 */ 3739 uint16_t num_stream, i; 3740 uint32_t seq; 3741 struct sctp_association *asoc = &stcb->asoc; 3742 struct sctp_queued_to_read *ctl; 3743 3744 /* Get the number. */ 3745 seq = ntohl(str_add->request_seq); 3746 num_stream = ntohs(str_add->number_of_streams); 3747 /* Now what would be the new total? */ 3748 if (asoc->str_reset_seq_in == seq) { 3749 num_stream += stcb->asoc.streamincnt; 3750 if (num_stream > stcb->asoc.max_inbound_streams) { 3751 /* We must reject it they ask for to many */ 3752 denied: 3753 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3754 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3755 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3756 } else { 3757 /* Ok, we can do that :-) */ 3758 struct sctp_stream_in *oldstrm; 3759 3760 /* save off the old */ 3761 oldstrm = stcb->asoc.strmin; 3762 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3763 (num_stream * sizeof(struct sctp_stream_in)), 3764 SCTP_M_STRMI); 3765 if (stcb->asoc.strmin == NULL) { 3766 stcb->asoc.strmin = oldstrm; 3767 goto denied; 3768 } 3769 /* copy off the old data */ 3770 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3771 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3772 stcb->asoc.strmin[i].stream_no = i; 3773 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3774 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3775 /* now anything on those queues? */ 3776 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) { 3777 ctl = TAILQ_FIRST(&oldstrm[i].inqueue); 3778 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3779 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3780 } 3781 } 3782 /* Init the new streams */ 3783 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3784 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3785 stcb->asoc.strmin[i].stream_no = i; 3786 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3787 stcb->asoc.strmin[i].delivery_started = 0; 3788 } 3789 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3790 /* update the size */ 3791 stcb->asoc.streamincnt = num_stream; 3792 /* Send the ack */ 3793 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3794 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3795 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3796 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3797 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3798 } 3799 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3800 /* 3801 * one seq back, just echo back last action since my 3802 * response was lost. 3803 */ 3804 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3805 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3806 /* 3807 * two seq back, just echo back last action since my 3808 * response was lost. 3809 */ 3810 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3811 } else { 3812 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3813 3814 } 3815 } 3816 3817 #ifdef __GNUC__ 3818 __attribute__((noinline)) 3819 #endif 3820 static int 3821 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3822 struct sctp_stream_reset_out_req *sr_req) 3823 { 3824 int chk_length, param_len, ptype; 3825 struct sctp_paramhdr pstore; 3826 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3827 3828 uint32_t seq; 3829 int num_req = 0; 3830 int trunc = 0; 3831 struct sctp_tmit_chunk *chk; 3832 struct sctp_chunkhdr *ch; 3833 struct sctp_paramhdr *ph; 3834 int ret_code = 0; 3835 int num_param = 0; 3836 3837 /* now it may be a reset or a reset-response */ 3838 chk_length = ntohs(sr_req->ch.chunk_length); 3839 3840 /* setup for adding the response */ 3841 sctp_alloc_a_chunk(stcb, chk); 3842 if (chk == NULL) { 3843 return (ret_code); 3844 } 3845 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3846 chk->rec.chunk_id.can_take_data = 0; 3847 chk->asoc = &stcb->asoc; 3848 chk->no_fr_allowed = 0; 3849 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3850 chk->book_size_scale = 0; 3851 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3852 if (chk->data == NULL) { 3853 strres_nochunk: 3854 if (chk->data) { 3855 sctp_m_freem(chk->data); 3856 chk->data = NULL; 3857 } 3858 sctp_free_a_chunk(stcb, chk); 3859 return (ret_code); 3860 } 3861 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3862 3863 /* setup chunk parameters */ 3864 chk->sent = SCTP_DATAGRAM_UNSENT; 3865 chk->snd_count = 0; 3866 chk->whoTo = stcb->asoc.primary_destination; 3867 atomic_add_int(&chk->whoTo->ref_count, 1); 3868 3869 ch = mtod(chk->data, struct sctp_chunkhdr *); 3870 ch->chunk_type = SCTP_STREAM_RESET; 3871 ch->chunk_flags = 0; 3872 ch->chunk_length = htons(chk->send_size); 3873 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3874 offset += sizeof(struct sctp_chunkhdr); 3875 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3876 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3877 if (ph == NULL) 3878 break; 3879 param_len = ntohs(ph->param_length); 3880 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3881 /* bad param */ 3882 break; 3883 } 3884 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3885 (uint8_t *) & cstore); 3886 ptype = ntohs(ph->param_type); 3887 num_param++; 3888 if (param_len > (int)sizeof(cstore)) { 3889 trunc = 1; 3890 } else { 3891 trunc = 0; 3892 } 3893 3894 if (num_param > SCTP_MAX_RESET_PARAMS) { 3895 /* hit the max of parameters already sorry.. */ 3896 break; 3897 } 3898 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3899 struct sctp_stream_reset_out_request *req_out; 3900 3901 req_out = (struct sctp_stream_reset_out_request *)ph; 3902 num_req++; 3903 if (stcb->asoc.stream_reset_outstanding) { 3904 seq = ntohl(req_out->response_seq); 3905 if (seq == stcb->asoc.str_reset_seq_out) { 3906 /* implicit ack */ 3907 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3908 } 3909 } 3910 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3911 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3912 struct sctp_stream_reset_add_strm *str_add; 3913 3914 str_add = (struct sctp_stream_reset_add_strm *)ph; 3915 num_req++; 3916 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3917 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3918 struct sctp_stream_reset_in_request *req_in; 3919 3920 num_req++; 3921 3922 req_in = (struct sctp_stream_reset_in_request *)ph; 3923 3924 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3925 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3926 struct sctp_stream_reset_tsn_request *req_tsn; 3927 3928 num_req++; 3929 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3930 3931 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3932 ret_code = 1; 3933 goto strres_nochunk; 3934 } 3935 /* no more */ 3936 break; 3937 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3938 struct sctp_stream_reset_response *resp; 3939 uint32_t result; 3940 3941 resp = (struct sctp_stream_reset_response *)ph; 3942 seq = ntohl(resp->response_seq); 3943 result = ntohl(resp->result); 3944 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3945 ret_code = 1; 3946 goto strres_nochunk; 3947 } 3948 } else { 3949 break; 3950 } 3951 offset += SCTP_SIZE32(param_len); 3952 chk_length -= SCTP_SIZE32(param_len); 3953 } 3954 if (num_req == 0) { 3955 /* we have no response free the stuff */ 3956 goto strres_nochunk; 3957 } 3958 /* ok we have a chunk to link in */ 3959 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3960 chk, 3961 sctp_next); 3962 stcb->asoc.ctrl_queue_cnt++; 3963 return (ret_code); 3964 } 3965 3966 /* 3967 * Handle a router or endpoints report of a packet loss, there are two ways 3968 * to handle this, either we get the whole packet and must disect it 3969 * ourselves (possibly with truncation and or corruption) or it is a summary 3970 * from a middle box that did the disectting for us. 3971 */ 3972 static void 3973 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3974 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3975 { 3976 uint32_t bottle_bw, on_queue; 3977 uint16_t trunc_len; 3978 unsigned int chlen; 3979 unsigned int at; 3980 struct sctp_chunk_desc desc; 3981 struct sctp_chunkhdr *ch; 3982 3983 chlen = ntohs(cp->ch.chunk_length); 3984 chlen -= sizeof(struct sctp_pktdrop_chunk); 3985 /* XXX possible chlen underflow */ 3986 if (chlen == 0) { 3987 ch = NULL; 3988 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3989 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3990 } else { 3991 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3992 chlen -= sizeof(struct sctphdr); 3993 /* XXX possible chlen underflow */ 3994 memset(&desc, 0, sizeof(desc)); 3995 } 3996 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3997 if (trunc_len > limit) { 3998 trunc_len = limit; 3999 } 4000 /* now the chunks themselves */ 4001 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4002 desc.chunk_type = ch->chunk_type; 4003 /* get amount we need to move */ 4004 at = ntohs(ch->chunk_length); 4005 if (at < sizeof(struct sctp_chunkhdr)) { 4006 /* corrupt chunk, maybe at the end? */ 4007 SCTP_STAT_INCR(sctps_pdrpcrupt); 4008 break; 4009 } 4010 if (trunc_len == 0) { 4011 /* we are supposed to have all of it */ 4012 if (at > chlen) { 4013 /* corrupt skip it */ 4014 SCTP_STAT_INCR(sctps_pdrpcrupt); 4015 break; 4016 } 4017 } else { 4018 /* is there enough of it left ? */ 4019 if (desc.chunk_type == SCTP_DATA) { 4020 if (chlen < (sizeof(struct sctp_data_chunk) + 4021 sizeof(desc.data_bytes))) { 4022 break; 4023 } 4024 } else { 4025 if (chlen < sizeof(struct sctp_chunkhdr)) { 4026 break; 4027 } 4028 } 4029 } 4030 if (desc.chunk_type == SCTP_DATA) { 4031 /* can we get out the tsn? */ 4032 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4033 SCTP_STAT_INCR(sctps_pdrpmbda); 4034 4035 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4036 /* yep */ 4037 struct sctp_data_chunk *dcp; 4038 uint8_t *ddp; 4039 unsigned int iii; 4040 4041 dcp = (struct sctp_data_chunk *)ch; 4042 ddp = (uint8_t *) (dcp + 1); 4043 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4044 desc.data_bytes[iii] = ddp[iii]; 4045 } 4046 desc.tsn_ifany = dcp->dp.tsn; 4047 } else { 4048 /* nope we are done. */ 4049 SCTP_STAT_INCR(sctps_pdrpnedat); 4050 break; 4051 } 4052 } else { 4053 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4054 SCTP_STAT_INCR(sctps_pdrpmbct); 4055 } 4056 4057 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4058 SCTP_STAT_INCR(sctps_pdrppdbrk); 4059 break; 4060 } 4061 if (SCTP_SIZE32(at) > chlen) { 4062 break; 4063 } 4064 chlen -= SCTP_SIZE32(at); 4065 if (chlen < sizeof(struct sctp_chunkhdr)) { 4066 /* done, none left */ 4067 break; 4068 } 4069 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4070 } 4071 /* Now update any rwnd --- possibly */ 4072 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4073 /* From a peer, we get a rwnd report */ 4074 uint32_t a_rwnd; 4075 4076 SCTP_STAT_INCR(sctps_pdrpfehos); 4077 4078 bottle_bw = ntohl(cp->bottle_bw); 4079 on_queue = ntohl(cp->current_onq); 4080 if (bottle_bw && on_queue) { 4081 /* a rwnd report is in here */ 4082 if (bottle_bw > on_queue) 4083 a_rwnd = bottle_bw - on_queue; 4084 else 4085 a_rwnd = 0; 4086 4087 if (a_rwnd == 0) 4088 stcb->asoc.peers_rwnd = 0; 4089 else { 4090 if (a_rwnd > stcb->asoc.total_flight) { 4091 stcb->asoc.peers_rwnd = 4092 a_rwnd - stcb->asoc.total_flight; 4093 } else { 4094 stcb->asoc.peers_rwnd = 0; 4095 } 4096 if (stcb->asoc.peers_rwnd < 4097 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4098 /* SWS sender side engages */ 4099 stcb->asoc.peers_rwnd = 0; 4100 } 4101 } 4102 } 4103 } else { 4104 SCTP_STAT_INCR(sctps_pdrpfmbox); 4105 } 4106 4107 /* now middle boxes in sat networks get a cwnd bump */ 4108 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4109 (stcb->asoc.sat_t3_loss_recovery == 0) && 4110 (stcb->asoc.sat_network)) { 4111 /* 4112 * This is debateable but for sat networks it makes sense 4113 * Note if a T3 timer has went off, we will prohibit any 4114 * changes to cwnd until we exit the t3 loss recovery. 4115 */ 4116 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4117 net, cp, &bottle_bw, &on_queue); 4118 } 4119 } 4120 4121 /* 4122 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4123 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4124 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4125 * length of the complete packet outputs: - length: modified to remaining 4126 * length after control processing - netp: modified to new sctp_nets after 4127 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4128 * bad packet,...) otherwise return the tcb for this packet 4129 */ 4130 #ifdef __GNUC__ 4131 __attribute__((noinline)) 4132 #endif 4133 static struct sctp_tcb * 4134 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4135 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4136 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4137 uint32_t vrf_id, uint16_t port) 4138 { 4139 struct sctp_association *asoc; 4140 uint32_t vtag_in; 4141 int num_chunks = 0; /* number of control chunks processed */ 4142 uint32_t chk_length; 4143 int ret; 4144 int abort_no_unlock = 0; 4145 4146 /* 4147 * How big should this be, and should it be alloc'd? Lets try the 4148 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4149 * until we get into jumbo grams and such.. 4150 */ 4151 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4152 struct sctp_tcb *locked_tcb = stcb; 4153 int got_auth = 0; 4154 uint32_t auth_offset = 0, auth_len = 0; 4155 int auth_skipped = 0; 4156 int asconf_cnt = 0; 4157 4158 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4159 struct socket *so; 4160 4161 #endif 4162 4163 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4164 iphlen, *offset, length, stcb); 4165 4166 /* validate chunk header length... */ 4167 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4168 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4169 ntohs(ch->chunk_length)); 4170 if (locked_tcb) { 4171 SCTP_TCB_UNLOCK(locked_tcb); 4172 } 4173 return (NULL); 4174 } 4175 /* 4176 * validate the verification tag 4177 */ 4178 vtag_in = ntohl(sh->v_tag); 4179 4180 if (locked_tcb) { 4181 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4182 } 4183 if (ch->chunk_type == SCTP_INITIATION) { 4184 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4185 ntohs(ch->chunk_length), vtag_in); 4186 if (vtag_in != 0) { 4187 /* protocol error- silently discard... */ 4188 SCTP_STAT_INCR(sctps_badvtag); 4189 if (locked_tcb) { 4190 SCTP_TCB_UNLOCK(locked_tcb); 4191 } 4192 return (NULL); 4193 } 4194 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4195 /* 4196 * If there is no stcb, skip the AUTH chunk and process 4197 * later after a stcb is found (to validate the lookup was 4198 * valid. 4199 */ 4200 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4201 (stcb == NULL) && 4202 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4203 /* save this chunk for later processing */ 4204 auth_skipped = 1; 4205 auth_offset = *offset; 4206 auth_len = ntohs(ch->chunk_length); 4207 4208 /* (temporarily) move past this chunk */ 4209 *offset += SCTP_SIZE32(auth_len); 4210 if (*offset >= length) { 4211 /* no more data left in the mbuf chain */ 4212 *offset = length; 4213 if (locked_tcb) { 4214 SCTP_TCB_UNLOCK(locked_tcb); 4215 } 4216 return (NULL); 4217 } 4218 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4219 sizeof(struct sctp_chunkhdr), chunk_buf); 4220 } 4221 if (ch == NULL) { 4222 /* Help */ 4223 *offset = length; 4224 if (locked_tcb) { 4225 SCTP_TCB_UNLOCK(locked_tcb); 4226 } 4227 return (NULL); 4228 } 4229 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4230 goto process_control_chunks; 4231 } 4232 /* 4233 * first check if it's an ASCONF with an unknown src addr we 4234 * need to look inside to find the association 4235 */ 4236 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4237 struct sctp_chunkhdr *asconf_ch = ch; 4238 uint32_t asconf_offset = 0, asconf_len = 0; 4239 4240 /* inp's refcount may be reduced */ 4241 SCTP_INP_INCR_REF(inp); 4242 4243 asconf_offset = *offset; 4244 do { 4245 asconf_len = ntohs(asconf_ch->chunk_length); 4246 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4247 break; 4248 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4249 *offset, sh, &inp, netp, vrf_id); 4250 if (stcb != NULL) 4251 break; 4252 asconf_offset += SCTP_SIZE32(asconf_len); 4253 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4254 sizeof(struct sctp_chunkhdr), chunk_buf); 4255 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4256 if (stcb == NULL) { 4257 /* 4258 * reduce inp's refcount if not reduced in 4259 * sctp_findassociation_ep_asconf(). 4260 */ 4261 SCTP_INP_DECR_REF(inp); 4262 } else { 4263 locked_tcb = stcb; 4264 } 4265 4266 /* now go back and verify any auth chunk to be sure */ 4267 if (auth_skipped && (stcb != NULL)) { 4268 struct sctp_auth_chunk *auth; 4269 4270 auth = (struct sctp_auth_chunk *) 4271 sctp_m_getptr(m, auth_offset, 4272 auth_len, chunk_buf); 4273 got_auth = 1; 4274 auth_skipped = 0; 4275 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4276 auth_offset)) { 4277 /* auth HMAC failed so dump it */ 4278 *offset = length; 4279 if (locked_tcb) { 4280 SCTP_TCB_UNLOCK(locked_tcb); 4281 } 4282 return (NULL); 4283 } else { 4284 /* remaining chunks are HMAC checked */ 4285 stcb->asoc.authenticated = 1; 4286 } 4287 } 4288 } 4289 if (stcb == NULL) { 4290 /* no association, so it's out of the blue... */ 4291 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4292 vrf_id, port); 4293 *offset = length; 4294 if (locked_tcb) { 4295 SCTP_TCB_UNLOCK(locked_tcb); 4296 } 4297 return (NULL); 4298 } 4299 asoc = &stcb->asoc; 4300 /* ABORT and SHUTDOWN can use either v_tag... */ 4301 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4302 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4303 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4304 if ((vtag_in == asoc->my_vtag) || 4305 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4306 (vtag_in == asoc->peer_vtag))) { 4307 /* this is valid */ 4308 } else { 4309 /* drop this packet... */ 4310 SCTP_STAT_INCR(sctps_badvtag); 4311 if (locked_tcb) { 4312 SCTP_TCB_UNLOCK(locked_tcb); 4313 } 4314 return (NULL); 4315 } 4316 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4317 if (vtag_in != asoc->my_vtag) { 4318 /* 4319 * this could be a stale SHUTDOWN-ACK or the 4320 * peer never got the SHUTDOWN-COMPLETE and 4321 * is still hung; we have started a new asoc 4322 * but it won't complete until the shutdown 4323 * is completed 4324 */ 4325 if (locked_tcb) { 4326 SCTP_TCB_UNLOCK(locked_tcb); 4327 } 4328 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4329 NULL, vrf_id, port); 4330 return (NULL); 4331 } 4332 } else { 4333 /* for all other chunks, vtag must match */ 4334 if (vtag_in != asoc->my_vtag) { 4335 /* invalid vtag... */ 4336 SCTPDBG(SCTP_DEBUG_INPUT3, 4337 "invalid vtag: %xh, expect %xh\n", 4338 vtag_in, asoc->my_vtag); 4339 SCTP_STAT_INCR(sctps_badvtag); 4340 if (locked_tcb) { 4341 SCTP_TCB_UNLOCK(locked_tcb); 4342 } 4343 *offset = length; 4344 return (NULL); 4345 } 4346 } 4347 } /* end if !SCTP_COOKIE_ECHO */ 4348 /* 4349 * process all control chunks... 4350 */ 4351 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4352 /* EY */ 4353 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4354 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4355 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4356 /* implied cookie-ack.. we must have lost the ack */ 4357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4358 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4359 stcb->asoc.overall_error_count, 4360 0, 4361 SCTP_FROM_SCTP_INPUT, 4362 __LINE__); 4363 } 4364 stcb->asoc.overall_error_count = 0; 4365 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4366 *netp); 4367 } 4368 process_control_chunks: 4369 while (IS_SCTP_CONTROL(ch)) { 4370 /* validate chunk length */ 4371 chk_length = ntohs(ch->chunk_length); 4372 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4373 ch->chunk_type, chk_length); 4374 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4375 if (chk_length < sizeof(*ch) || 4376 (*offset + (int)chk_length) > length) { 4377 *offset = length; 4378 if (locked_tcb) { 4379 SCTP_TCB_UNLOCK(locked_tcb); 4380 } 4381 return (NULL); 4382 } 4383 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4384 /* 4385 * INIT-ACK only gets the init ack "header" portion only 4386 * because we don't have to process the peer's COOKIE. All 4387 * others get a complete chunk. 4388 */ 4389 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4390 (ch->chunk_type == SCTP_INITIATION)) { 4391 /* get an init-ack chunk */ 4392 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4393 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4394 if (ch == NULL) { 4395 *offset = length; 4396 if (locked_tcb) { 4397 SCTP_TCB_UNLOCK(locked_tcb); 4398 } 4399 return (NULL); 4400 } 4401 } else { 4402 /* For cookies and all other chunks. */ 4403 if (chk_length > sizeof(chunk_buf)) { 4404 /* 4405 * use just the size of the chunk buffer so 4406 * the front part of our chunks fit in 4407 * contiguous space up to the chunk buffer 4408 * size (508 bytes). For chunks that need to 4409 * get more than that they must use the 4410 * sctp_m_getptr() function or other means 4411 * (e.g. know how to parse mbuf chains). 4412 * Cookies do this already. 4413 */ 4414 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4415 (sizeof(chunk_buf) - 4), 4416 chunk_buf); 4417 if (ch == NULL) { 4418 *offset = length; 4419 if (locked_tcb) { 4420 SCTP_TCB_UNLOCK(locked_tcb); 4421 } 4422 return (NULL); 4423 } 4424 } else { 4425 /* We can fit it all */ 4426 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4427 chk_length, chunk_buf); 4428 if (ch == NULL) { 4429 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4430 *offset = length; 4431 if (locked_tcb) { 4432 SCTP_TCB_UNLOCK(locked_tcb); 4433 } 4434 return (NULL); 4435 } 4436 } 4437 } 4438 num_chunks++; 4439 /* Save off the last place we got a control from */ 4440 if (stcb != NULL) { 4441 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4442 /* 4443 * allow last_control to be NULL if 4444 * ASCONF... ASCONF processing will find the 4445 * right net later 4446 */ 4447 if ((netp != NULL) && (*netp != NULL)) 4448 stcb->asoc.last_control_chunk_from = *netp; 4449 } 4450 } 4451 #ifdef SCTP_AUDITING_ENABLED 4452 sctp_audit_log(0xB0, ch->chunk_type); 4453 #endif 4454 4455 /* check to see if this chunk required auth, but isn't */ 4456 if ((stcb != NULL) && 4457 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4458 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4459 !stcb->asoc.authenticated) { 4460 /* "silently" ignore */ 4461 SCTP_STAT_INCR(sctps_recvauthmissing); 4462 goto next_chunk; 4463 } 4464 switch (ch->chunk_type) { 4465 case SCTP_INITIATION: 4466 /* must be first and only chunk */ 4467 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4468 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4469 /* We are not interested anymore? */ 4470 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4471 /* 4472 * collision case where we are 4473 * sending to them too 4474 */ 4475 ; 4476 } else { 4477 if (locked_tcb) { 4478 SCTP_TCB_UNLOCK(locked_tcb); 4479 } 4480 *offset = length; 4481 return (NULL); 4482 } 4483 } 4484 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4485 (num_chunks > 1) || 4486 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4487 *offset = length; 4488 if (locked_tcb) { 4489 SCTP_TCB_UNLOCK(locked_tcb); 4490 } 4491 return (NULL); 4492 } 4493 if ((stcb != NULL) && 4494 (SCTP_GET_STATE(&stcb->asoc) == 4495 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4496 sctp_send_shutdown_ack(stcb, 4497 stcb->asoc.primary_destination); 4498 *offset = length; 4499 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4500 if (locked_tcb) { 4501 SCTP_TCB_UNLOCK(locked_tcb); 4502 } 4503 return (NULL); 4504 } 4505 if (netp) { 4506 sctp_handle_init(m, iphlen, *offset, sh, 4507 (struct sctp_init_chunk *)ch, inp, 4508 stcb, *netp, &abort_no_unlock, vrf_id, port); 4509 } 4510 if (abort_no_unlock) 4511 return (NULL); 4512 4513 *offset = length; 4514 if (locked_tcb) { 4515 SCTP_TCB_UNLOCK(locked_tcb); 4516 } 4517 return (NULL); 4518 break; 4519 case SCTP_PAD_CHUNK: 4520 break; 4521 case SCTP_INITIATION_ACK: 4522 /* must be first and only chunk */ 4523 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4524 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4525 /* We are not interested anymore */ 4526 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4527 ; 4528 } else { 4529 if (locked_tcb) { 4530 SCTP_TCB_UNLOCK(locked_tcb); 4531 } 4532 *offset = length; 4533 if (stcb) { 4534 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4535 so = SCTP_INP_SO(inp); 4536 atomic_add_int(&stcb->asoc.refcnt, 1); 4537 SCTP_TCB_UNLOCK(stcb); 4538 SCTP_SOCKET_LOCK(so, 1); 4539 SCTP_TCB_LOCK(stcb); 4540 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4541 #endif 4542 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4543 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4544 SCTP_SOCKET_UNLOCK(so, 1); 4545 #endif 4546 } 4547 return (NULL); 4548 } 4549 } 4550 if ((num_chunks > 1) || 4551 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4552 *offset = length; 4553 if (locked_tcb) { 4554 SCTP_TCB_UNLOCK(locked_tcb); 4555 } 4556 return (NULL); 4557 } 4558 if ((netp) && (*netp)) { 4559 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4560 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4561 } else { 4562 ret = -1; 4563 } 4564 /* 4565 * Special case, I must call the output routine to 4566 * get the cookie echoed 4567 */ 4568 if (abort_no_unlock) 4569 return (NULL); 4570 4571 if ((stcb) && ret == 0) 4572 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4573 *offset = length; 4574 if (locked_tcb) { 4575 SCTP_TCB_UNLOCK(locked_tcb); 4576 } 4577 return (NULL); 4578 break; 4579 case SCTP_SELECTIVE_ACK: 4580 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4581 SCTP_STAT_INCR(sctps_recvsacks); 4582 { 4583 struct sctp_sack_chunk *sack; 4584 int abort_now = 0; 4585 uint32_t a_rwnd, cum_ack; 4586 uint16_t num_seg, num_dup; 4587 uint8_t flags; 4588 int offset_seg, offset_dup; 4589 int nonce_sum_flag; 4590 4591 if (stcb == NULL) { 4592 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4593 break; 4594 } 4595 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4596 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4597 break; 4598 } 4599 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4600 /*- 4601 * If we have sent a shutdown-ack, we will pay no 4602 * attention to a sack sent in to us since 4603 * we don't care anymore. 4604 */ 4605 break; 4606 } 4607 sack = (struct sctp_sack_chunk *)ch; 4608 flags = ch->chunk_flags; 4609 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4610 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4611 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4612 num_dup = ntohs(sack->sack.num_dup_tsns); 4613 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4614 if (sizeof(struct sctp_sack_chunk) + 4615 num_seg * sizeof(struct sctp_gap_ack_block) + 4616 num_dup * sizeof(uint32_t) != chk_length) { 4617 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4618 break; 4619 } 4620 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4621 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4622 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4623 cum_ack, num_seg, a_rwnd); 4624 stcb->asoc.seen_a_sack_this_pkt = 1; 4625 if ((stcb->asoc.pr_sctp_cnt == 0) && 4626 (num_seg == 0) && 4627 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4628 (cum_ack == stcb->asoc.last_acked_seq)) && 4629 (stcb->asoc.saw_sack_with_frags == 0) && 4630 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4631 ) { 4632 /* 4633 * We have a SIMPLE sack having no 4634 * prior segments and data on sent 4635 * queue to be acked.. Use the 4636 * faster path sack processing. We 4637 * also allow window update sacks 4638 * with no missing segments to go 4639 * this way too. 4640 */ 4641 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4642 &abort_now); 4643 } else { 4644 if (netp && *netp) 4645 sctp_handle_sack(m, offset_seg, offset_dup, 4646 stcb, *netp, 4647 num_seg, 0, num_dup, &abort_now, flags, 4648 cum_ack, a_rwnd); 4649 } 4650 if (abort_now) { 4651 /* ABORT signal from sack processing */ 4652 *offset = length; 4653 return (NULL); 4654 } 4655 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4656 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4657 (stcb->asoc.stream_queue_cnt == 0)) { 4658 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4659 } 4660 } 4661 break; 4662 /* 4663 * EY - nr_sack: If the received chunk is an 4664 * nr_sack chunk 4665 */ 4666 case SCTP_NR_SELECTIVE_ACK: 4667 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4668 SCTP_STAT_INCR(sctps_recvsacks); 4669 { 4670 struct sctp_nr_sack_chunk *nr_sack; 4671 int abort_now = 0; 4672 uint32_t a_rwnd, cum_ack; 4673 uint16_t num_seg, num_nr_seg, num_dup; 4674 uint8_t flags; 4675 int offset_seg, offset_dup; 4676 int nonce_sum_flag; 4677 4678 /* 4679 * EY nr_sacks have not been negotiated but 4680 * the peer end sent an nr_sack, silently 4681 * discard the chunk 4682 */ 4683 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && 4684 stcb->asoc.peer_supports_nr_sack)) { 4685 goto unknown_chunk; 4686 } 4687 if (stcb == NULL) { 4688 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4689 break; 4690 } 4691 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4692 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4693 break; 4694 } 4695 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4696 /*- 4697 * If we have sent a shutdown-ack, we will pay no 4698 * attention to a sack sent in to us since 4699 * we don't care anymore. 4700 */ 4701 break; 4702 } 4703 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4704 flags = ch->chunk_flags; 4705 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4706 4707 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4708 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4709 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4710 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4711 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4712 if (sizeof(struct sctp_nr_sack_chunk) + 4713 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4714 num_dup * sizeof(uint32_t) != chk_length) { 4715 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4716 break; 4717 } 4718 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4719 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4720 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4721 cum_ack, num_seg, a_rwnd); 4722 stcb->asoc.seen_a_sack_this_pkt = 1; 4723 if ((stcb->asoc.pr_sctp_cnt == 0) && 4724 (num_seg == 0) && (num_nr_seg == 0) && 4725 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4726 (cum_ack == stcb->asoc.last_acked_seq)) && 4727 (stcb->asoc.saw_sack_with_frags == 0) && 4728 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4729 /* 4730 * We have a SIMPLE sack having no 4731 * prior segments and data on sent 4732 * queue to be acked. Use the faster 4733 * path sack processing. We also 4734 * allow window update sacks with no 4735 * missing segments to go this way 4736 * too. 4737 */ 4738 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4739 &abort_now); 4740 } else { 4741 if (netp && *netp) 4742 sctp_handle_sack(m, offset_seg, offset_dup, 4743 stcb, *netp, 4744 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4745 cum_ack, a_rwnd); 4746 } 4747 if (abort_now) { 4748 /* ABORT signal from sack processing */ 4749 *offset = length; 4750 return (NULL); 4751 } 4752 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4753 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4754 (stcb->asoc.stream_queue_cnt == 0)) { 4755 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4756 } 4757 } 4758 break; 4759 4760 case SCTP_HEARTBEAT_REQUEST: 4761 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4762 if ((stcb) && netp && *netp) { 4763 SCTP_STAT_INCR(sctps_recvheartbeat); 4764 sctp_send_heartbeat_ack(stcb, m, *offset, 4765 chk_length, *netp); 4766 4767 /* He's alive so give him credit */ 4768 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4769 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4770 stcb->asoc.overall_error_count, 4771 0, 4772 SCTP_FROM_SCTP_INPUT, 4773 __LINE__); 4774 } 4775 stcb->asoc.overall_error_count = 0; 4776 } 4777 break; 4778 case SCTP_HEARTBEAT_ACK: 4779 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4780 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4781 /* Its not ours */ 4782 *offset = length; 4783 if (locked_tcb) { 4784 SCTP_TCB_UNLOCK(locked_tcb); 4785 } 4786 return (NULL); 4787 } 4788 /* He's alive so give him credit */ 4789 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4790 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4791 stcb->asoc.overall_error_count, 4792 0, 4793 SCTP_FROM_SCTP_INPUT, 4794 __LINE__); 4795 } 4796 stcb->asoc.overall_error_count = 0; 4797 SCTP_STAT_INCR(sctps_recvheartbeatack); 4798 if (netp && *netp) 4799 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4800 stcb, *netp); 4801 break; 4802 case SCTP_ABORT_ASSOCIATION: 4803 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4804 stcb); 4805 if ((stcb) && netp && *netp) 4806 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4807 stcb, *netp); 4808 *offset = length; 4809 return (NULL); 4810 break; 4811 case SCTP_SHUTDOWN: 4812 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4813 stcb); 4814 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4815 *offset = length; 4816 if (locked_tcb) { 4817 SCTP_TCB_UNLOCK(locked_tcb); 4818 } 4819 return (NULL); 4820 } 4821 if (netp && *netp) { 4822 int abort_flag = 0; 4823 4824 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4825 stcb, *netp, &abort_flag); 4826 if (abort_flag) { 4827 *offset = length; 4828 return (NULL); 4829 } 4830 } 4831 break; 4832 case SCTP_SHUTDOWN_ACK: 4833 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4834 if ((stcb) && (netp) && (*netp)) 4835 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4836 *offset = length; 4837 return (NULL); 4838 break; 4839 4840 case SCTP_OPERATION_ERROR: 4841 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4842 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4843 4844 *offset = length; 4845 return (NULL); 4846 } 4847 break; 4848 case SCTP_COOKIE_ECHO: 4849 SCTPDBG(SCTP_DEBUG_INPUT3, 4850 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4851 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4852 ; 4853 } else { 4854 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4855 /* We are not interested anymore */ 4856 *offset = length; 4857 return (NULL); 4858 } 4859 } 4860 /* 4861 * First are we accepting? We do this again here 4862 * sincen it is possible that a previous endpoint 4863 * WAS listening responded to a INIT-ACK and then 4864 * closed. We opened and bound.. and are now no 4865 * longer listening. 4866 */ 4867 4868 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4869 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4870 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4871 struct mbuf *oper; 4872 struct sctp_paramhdr *phdr; 4873 4874 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4875 0, M_DONTWAIT, 1, MT_DATA); 4876 if (oper) { 4877 SCTP_BUF_LEN(oper) = 4878 sizeof(struct sctp_paramhdr); 4879 phdr = mtod(oper, 4880 struct sctp_paramhdr *); 4881 phdr->param_type = 4882 htons(SCTP_CAUSE_OUT_OF_RESC); 4883 phdr->param_length = 4884 htons(sizeof(struct sctp_paramhdr)); 4885 } 4886 sctp_abort_association(inp, stcb, m, 4887 iphlen, sh, oper, vrf_id, port); 4888 } 4889 *offset = length; 4890 return (NULL); 4891 } else { 4892 struct mbuf *ret_buf; 4893 struct sctp_inpcb *linp; 4894 4895 if (stcb) { 4896 linp = NULL; 4897 } else { 4898 linp = inp; 4899 } 4900 4901 if (linp) { 4902 SCTP_ASOC_CREATE_LOCK(linp); 4903 } 4904 if (netp) { 4905 ret_buf = 4906 sctp_handle_cookie_echo(m, iphlen, 4907 *offset, sh, 4908 (struct sctp_cookie_echo_chunk *)ch, 4909 &inp, &stcb, netp, 4910 auth_skipped, 4911 auth_offset, 4912 auth_len, 4913 &locked_tcb, 4914 vrf_id, 4915 port); 4916 } else { 4917 ret_buf = NULL; 4918 } 4919 if (linp) { 4920 SCTP_ASOC_CREATE_UNLOCK(linp); 4921 } 4922 if (ret_buf == NULL) { 4923 if (locked_tcb) { 4924 SCTP_TCB_UNLOCK(locked_tcb); 4925 } 4926 SCTPDBG(SCTP_DEBUG_INPUT3, 4927 "GAK, null buffer\n"); 4928 auth_skipped = 0; 4929 *offset = length; 4930 return (NULL); 4931 } 4932 /* if AUTH skipped, see if it verified... */ 4933 if (auth_skipped) { 4934 got_auth = 1; 4935 auth_skipped = 0; 4936 } 4937 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4938 /* 4939 * Restart the timer if we have 4940 * pending data 4941 */ 4942 struct sctp_tmit_chunk *chk; 4943 4944 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4945 if (chk) { 4946 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4947 stcb->sctp_ep, stcb, 4948 chk->whoTo); 4949 } 4950 } 4951 } 4952 break; 4953 case SCTP_COOKIE_ACK: 4954 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4955 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4956 if (locked_tcb) { 4957 SCTP_TCB_UNLOCK(locked_tcb); 4958 } 4959 return (NULL); 4960 } 4961 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4962 /* We are not interested anymore */ 4963 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4964 ; 4965 } else if (stcb) { 4966 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4967 so = SCTP_INP_SO(inp); 4968 atomic_add_int(&stcb->asoc.refcnt, 1); 4969 SCTP_TCB_UNLOCK(stcb); 4970 SCTP_SOCKET_LOCK(so, 1); 4971 SCTP_TCB_LOCK(stcb); 4972 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4973 #endif 4974 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4975 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4976 SCTP_SOCKET_UNLOCK(so, 1); 4977 #endif 4978 *offset = length; 4979 return (NULL); 4980 } 4981 } 4982 /* He's alive so give him credit */ 4983 if ((stcb) && netp && *netp) { 4984 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4985 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4986 stcb->asoc.overall_error_count, 4987 0, 4988 SCTP_FROM_SCTP_INPUT, 4989 __LINE__); 4990 } 4991 stcb->asoc.overall_error_count = 0; 4992 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4993 } 4994 break; 4995 case SCTP_ECN_ECHO: 4996 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4997 /* He's alive so give him credit */ 4998 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4999 /* Its not ours */ 5000 if (locked_tcb) { 5001 SCTP_TCB_UNLOCK(locked_tcb); 5002 } 5003 *offset = length; 5004 return (NULL); 5005 } 5006 if (stcb) { 5007 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5008 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5009 stcb->asoc.overall_error_count, 5010 0, 5011 SCTP_FROM_SCTP_INPUT, 5012 __LINE__); 5013 } 5014 stcb->asoc.overall_error_count = 0; 5015 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5016 stcb); 5017 } 5018 break; 5019 case SCTP_ECN_CWR: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5021 /* He's alive so give him credit */ 5022 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5023 /* Its not ours */ 5024 if (locked_tcb) { 5025 SCTP_TCB_UNLOCK(locked_tcb); 5026 } 5027 *offset = length; 5028 return (NULL); 5029 } 5030 if (stcb) { 5031 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5032 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5033 stcb->asoc.overall_error_count, 5034 0, 5035 SCTP_FROM_SCTP_INPUT, 5036 __LINE__); 5037 } 5038 stcb->asoc.overall_error_count = 0; 5039 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5040 } 5041 break; 5042 case SCTP_SHUTDOWN_COMPLETE: 5043 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5044 /* must be first and only chunk */ 5045 if ((num_chunks > 1) || 5046 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5047 *offset = length; 5048 if (locked_tcb) { 5049 SCTP_TCB_UNLOCK(locked_tcb); 5050 } 5051 return (NULL); 5052 } 5053 if ((stcb) && netp && *netp) { 5054 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5055 stcb, *netp); 5056 } 5057 *offset = length; 5058 return (NULL); 5059 break; 5060 case SCTP_ASCONF: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5062 /* He's alive so give him credit */ 5063 if (stcb) { 5064 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5065 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5066 stcb->asoc.overall_error_count, 5067 0, 5068 SCTP_FROM_SCTP_INPUT, 5069 __LINE__); 5070 } 5071 stcb->asoc.overall_error_count = 0; 5072 sctp_handle_asconf(m, *offset, 5073 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5074 asconf_cnt++; 5075 } 5076 break; 5077 case SCTP_ASCONF_ACK: 5078 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5079 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5080 /* Its not ours */ 5081 if (locked_tcb) { 5082 SCTP_TCB_UNLOCK(locked_tcb); 5083 } 5084 *offset = length; 5085 return (NULL); 5086 } 5087 if ((stcb) && netp && *netp) { 5088 /* He's alive so give him credit */ 5089 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5090 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5091 stcb->asoc.overall_error_count, 5092 0, 5093 SCTP_FROM_SCTP_INPUT, 5094 __LINE__); 5095 } 5096 stcb->asoc.overall_error_count = 0; 5097 sctp_handle_asconf_ack(m, *offset, 5098 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5099 if (abort_no_unlock) 5100 return (NULL); 5101 } 5102 break; 5103 case SCTP_FORWARD_CUM_TSN: 5104 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5105 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5106 /* Its not ours */ 5107 if (locked_tcb) { 5108 SCTP_TCB_UNLOCK(locked_tcb); 5109 } 5110 *offset = length; 5111 return (NULL); 5112 } 5113 /* He's alive so give him credit */ 5114 if (stcb) { 5115 int abort_flag = 0; 5116 5117 stcb->asoc.overall_error_count = 0; 5118 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5119 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5120 stcb->asoc.overall_error_count, 5121 0, 5122 SCTP_FROM_SCTP_INPUT, 5123 __LINE__); 5124 } 5125 *fwd_tsn_seen = 1; 5126 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5127 /* We are not interested anymore */ 5128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5129 so = SCTP_INP_SO(inp); 5130 atomic_add_int(&stcb->asoc.refcnt, 1); 5131 SCTP_TCB_UNLOCK(stcb); 5132 SCTP_SOCKET_LOCK(so, 1); 5133 SCTP_TCB_LOCK(stcb); 5134 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5135 #endif 5136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5137 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5138 SCTP_SOCKET_UNLOCK(so, 1); 5139 #endif 5140 *offset = length; 5141 return (NULL); 5142 } 5143 sctp_handle_forward_tsn(stcb, 5144 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5145 if (abort_flag) { 5146 *offset = length; 5147 return (NULL); 5148 } else { 5149 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5150 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5151 stcb->asoc.overall_error_count, 5152 0, 5153 SCTP_FROM_SCTP_INPUT, 5154 __LINE__); 5155 } 5156 stcb->asoc.overall_error_count = 0; 5157 } 5158 5159 } 5160 break; 5161 case SCTP_STREAM_RESET: 5162 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5163 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5164 /* Its not ours */ 5165 if (locked_tcb) { 5166 SCTP_TCB_UNLOCK(locked_tcb); 5167 } 5168 *offset = length; 5169 return (NULL); 5170 } 5171 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5172 /* We are not interested anymore */ 5173 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5174 so = SCTP_INP_SO(inp); 5175 atomic_add_int(&stcb->asoc.refcnt, 1); 5176 SCTP_TCB_UNLOCK(stcb); 5177 SCTP_SOCKET_LOCK(so, 1); 5178 SCTP_TCB_LOCK(stcb); 5179 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5180 #endif 5181 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5182 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5183 SCTP_SOCKET_UNLOCK(so, 1); 5184 #endif 5185 *offset = length; 5186 return (NULL); 5187 } 5188 if (stcb->asoc.peer_supports_strreset == 0) { 5189 /* 5190 * hmm, peer should have announced this, but 5191 * we will turn it on since he is sending us 5192 * a stream reset. 5193 */ 5194 stcb->asoc.peer_supports_strreset = 1; 5195 } 5196 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5197 /* stop processing */ 5198 *offset = length; 5199 return (NULL); 5200 } 5201 break; 5202 case SCTP_PACKET_DROPPED: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5204 /* re-get it all please */ 5205 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5206 /* Its not ours */ 5207 if (locked_tcb) { 5208 SCTP_TCB_UNLOCK(locked_tcb); 5209 } 5210 *offset = length; 5211 return (NULL); 5212 } 5213 if (ch && (stcb) && netp && (*netp)) { 5214 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5215 stcb, *netp, 5216 min(chk_length, (sizeof(chunk_buf) - 4))); 5217 5218 } 5219 break; 5220 5221 case SCTP_AUTHENTICATION: 5222 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5223 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5224 goto unknown_chunk; 5225 5226 if (stcb == NULL) { 5227 /* save the first AUTH for later processing */ 5228 if (auth_skipped == 0) { 5229 auth_offset = *offset; 5230 auth_len = chk_length; 5231 auth_skipped = 1; 5232 } 5233 /* skip this chunk (temporarily) */ 5234 goto next_chunk; 5235 } 5236 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5237 (chk_length > (sizeof(struct sctp_auth_chunk) + 5238 SCTP_AUTH_DIGEST_LEN_MAX))) { 5239 /* Its not ours */ 5240 if (locked_tcb) { 5241 SCTP_TCB_UNLOCK(locked_tcb); 5242 } 5243 *offset = length; 5244 return (NULL); 5245 } 5246 if (got_auth == 1) { 5247 /* skip this chunk... it's already auth'd */ 5248 goto next_chunk; 5249 } 5250 got_auth = 1; 5251 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5252 m, *offset)) { 5253 /* auth HMAC failed so dump the packet */ 5254 *offset = length; 5255 return (stcb); 5256 } else { 5257 /* remaining chunks are HMAC checked */ 5258 stcb->asoc.authenticated = 1; 5259 } 5260 break; 5261 5262 default: 5263 unknown_chunk: 5264 /* it's an unknown chunk! */ 5265 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5266 struct mbuf *mm; 5267 struct sctp_paramhdr *phd; 5268 5269 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5270 0, M_DONTWAIT, 1, MT_DATA); 5271 if (mm) { 5272 phd = mtod(mm, struct sctp_paramhdr *); 5273 /* 5274 * We cheat and use param type since 5275 * we did not bother to define a 5276 * error cause struct. They are the 5277 * same basic format with different 5278 * names. 5279 */ 5280 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5281 phd->param_length = htons(chk_length + sizeof(*phd)); 5282 SCTP_BUF_LEN(mm) = sizeof(*phd); 5283 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5284 M_DONTWAIT); 5285 if (SCTP_BUF_NEXT(mm)) { 5286 #ifdef SCTP_MBUF_LOGGING 5287 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5288 struct mbuf *mat; 5289 5290 mat = SCTP_BUF_NEXT(mm); 5291 while (mat) { 5292 if (SCTP_BUF_IS_EXTENDED(mat)) { 5293 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5294 } 5295 mat = SCTP_BUF_NEXT(mat); 5296 } 5297 } 5298 #endif 5299 sctp_queue_op_err(stcb, mm); 5300 } else { 5301 sctp_m_freem(mm); 5302 } 5303 } 5304 } 5305 if ((ch->chunk_type & 0x80) == 0) { 5306 /* discard this packet */ 5307 *offset = length; 5308 return (stcb); 5309 } /* else skip this bad chunk and continue... */ 5310 break; 5311 } /* switch (ch->chunk_type) */ 5312 5313 5314 next_chunk: 5315 /* get the next chunk */ 5316 *offset += SCTP_SIZE32(chk_length); 5317 if (*offset >= length) { 5318 /* no more data left in the mbuf chain */ 5319 break; 5320 } 5321 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5322 sizeof(struct sctp_chunkhdr), chunk_buf); 5323 if (ch == NULL) { 5324 if (locked_tcb) { 5325 SCTP_TCB_UNLOCK(locked_tcb); 5326 } 5327 *offset = length; 5328 return (NULL); 5329 } 5330 } /* while */ 5331 5332 if (asconf_cnt > 0 && stcb != NULL) { 5333 sctp_send_asconf_ack(stcb); 5334 } 5335 return (stcb); 5336 } 5337 5338 5339 /* 5340 * Process the ECN bits we have something set so we must look to see if it is 5341 * ECN(0) or ECN(1) or CE 5342 */ 5343 static void 5344 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5345 uint8_t ecn_bits) 5346 { 5347 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5348 ; 5349 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5350 /* 5351 * we only add to the nonce sum for ECT1, ECT0 does not 5352 * change the NS bit (that we have yet to find a way to send 5353 * it yet). 5354 */ 5355 5356 /* ECN Nonce stuff */ 5357 stcb->asoc.receiver_nonce_sum++; 5358 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5359 5360 /* 5361 * Drag up the last_echo point if cumack is larger since we 5362 * don't want the point falling way behind by more than 5363 * 2^^31 and then having it be incorrect. 5364 */ 5365 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5366 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5367 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5368 } 5369 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5370 /* 5371 * Drag up the last_echo point if cumack is larger since we 5372 * don't want the point falling way behind by more than 5373 * 2^^31 and then having it be incorrect. 5374 */ 5375 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5376 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5377 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5378 } 5379 } 5380 } 5381 5382 static void 5383 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5384 uint32_t high_tsn, uint8_t ecn_bits) 5385 { 5386 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5387 /* 5388 * we possibly must notify the sender that a congestion 5389 * window reduction is in order. We do this by adding a ECNE 5390 * chunk to the output chunk queue. The incoming CWR will 5391 * remove this chunk. 5392 */ 5393 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5394 MAX_TSN)) { 5395 /* Yep, we need to add a ECNE */ 5396 sctp_send_ecn_echo(stcb, net, high_tsn); 5397 stcb->asoc.last_echo_tsn = high_tsn; 5398 } 5399 } 5400 } 5401 5402 #ifdef INVARIANTS 5403 static void 5404 sctp_validate_no_locks(struct sctp_inpcb *inp) 5405 { 5406 struct sctp_tcb *stcb; 5407 5408 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 5409 if (mtx_owned(&stcb->tcb_mtx)) { 5410 panic("Own lock on stcb at return from input"); 5411 } 5412 } 5413 } 5414 5415 #endif 5416 5417 /* 5418 * common input chunk processing (v4 and v6) 5419 */ 5420 void 5421 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5422 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5423 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5424 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5425 { 5426 /* 5427 * Control chunk processing 5428 */ 5429 uint32_t high_tsn; 5430 int fwd_tsn_seen = 0, data_processed = 0; 5431 struct mbuf *m = *mm; 5432 int abort_flag = 0; 5433 int un_sent; 5434 5435 SCTP_STAT_INCR(sctps_recvdatagrams); 5436 #ifdef SCTP_AUDITING_ENABLED 5437 sctp_audit_log(0xE0, 1); 5438 sctp_auditing(0, inp, stcb, net); 5439 #endif 5440 5441 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5442 m, iphlen, offset, length, stcb); 5443 if (stcb) { 5444 /* always clear this before beginning a packet */ 5445 stcb->asoc.authenticated = 0; 5446 stcb->asoc.seen_a_sack_this_pkt = 0; 5447 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5448 stcb, stcb->asoc.state); 5449 5450 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5451 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5452 /*- 5453 * If we hit here, we had a ref count 5454 * up when the assoc was aborted and the 5455 * timer is clearing out the assoc, we should 5456 * NOT respond to any packet.. its OOTB. 5457 */ 5458 SCTP_TCB_UNLOCK(stcb); 5459 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5460 vrf_id, port); 5461 goto out_now; 5462 } 5463 } 5464 if (IS_SCTP_CONTROL(ch)) { 5465 /* process the control portion of the SCTP packet */ 5466 /* sa_ignore NO_NULL_CHK */ 5467 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5468 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5469 if (stcb) { 5470 /* 5471 * This covers us if the cookie-echo was there and 5472 * it changes our INP. 5473 */ 5474 inp = stcb->sctp_ep; 5475 if ((net) && (port)) { 5476 if (net->port == 0) { 5477 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5478 } 5479 net->port = port; 5480 } 5481 } 5482 } else { 5483 /* 5484 * no control chunks, so pre-process DATA chunks (these 5485 * checks are taken care of by control processing) 5486 */ 5487 5488 /* 5489 * if DATA only packet, and auth is required, then punt... 5490 * can't have authenticated without any AUTH (control) 5491 * chunks 5492 */ 5493 if ((stcb != NULL) && 5494 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5495 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5496 /* "silently" ignore */ 5497 SCTP_STAT_INCR(sctps_recvauthmissing); 5498 SCTP_TCB_UNLOCK(stcb); 5499 goto out_now; 5500 } 5501 if (stcb == NULL) { 5502 /* out of the blue DATA chunk */ 5503 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5504 vrf_id, port); 5505 goto out_now; 5506 } 5507 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5508 /* v_tag mismatch! */ 5509 SCTP_STAT_INCR(sctps_badvtag); 5510 SCTP_TCB_UNLOCK(stcb); 5511 goto out_now; 5512 } 5513 } 5514 5515 if (stcb == NULL) { 5516 /* 5517 * no valid TCB for this packet, or we found it's a bad 5518 * packet while processing control, or we're done with this 5519 * packet (done or skip rest of data), so we drop it... 5520 */ 5521 goto out_now; 5522 } 5523 /* 5524 * DATA chunk processing 5525 */ 5526 /* plow through the data chunks while length > offset */ 5527 5528 /* 5529 * Rest should be DATA only. Check authentication state if AUTH for 5530 * DATA is required. 5531 */ 5532 if ((length > offset) && 5533 (stcb != NULL) && 5534 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5535 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5536 !stcb->asoc.authenticated) { 5537 /* "silently" ignore */ 5538 SCTP_STAT_INCR(sctps_recvauthmissing); 5539 SCTPDBG(SCTP_DEBUG_AUTH1, 5540 "Data chunk requires AUTH, skipped\n"); 5541 goto trigger_send; 5542 } 5543 if (length > offset) { 5544 int retval; 5545 5546 /* 5547 * First check to make sure our state is correct. We would 5548 * not get here unless we really did have a tag, so we don't 5549 * abort if this happens, just dump the chunk silently. 5550 */ 5551 switch (SCTP_GET_STATE(&stcb->asoc)) { 5552 case SCTP_STATE_COOKIE_ECHOED: 5553 /* 5554 * we consider data with valid tags in this state 5555 * shows us the cookie-ack was lost. Imply it was 5556 * there. 5557 */ 5558 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5559 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5560 stcb->asoc.overall_error_count, 5561 0, 5562 SCTP_FROM_SCTP_INPUT, 5563 __LINE__); 5564 } 5565 stcb->asoc.overall_error_count = 0; 5566 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5567 break; 5568 case SCTP_STATE_COOKIE_WAIT: 5569 /* 5570 * We consider OOTB any data sent during asoc setup. 5571 */ 5572 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5573 vrf_id, port); 5574 SCTP_TCB_UNLOCK(stcb); 5575 goto out_now; 5576 /* sa_ignore NOTREACHED */ 5577 break; 5578 case SCTP_STATE_EMPTY: /* should not happen */ 5579 case SCTP_STATE_INUSE: /* should not happen */ 5580 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5581 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5582 default: 5583 SCTP_TCB_UNLOCK(stcb); 5584 goto out_now; 5585 /* sa_ignore NOTREACHED */ 5586 break; 5587 case SCTP_STATE_OPEN: 5588 case SCTP_STATE_SHUTDOWN_SENT: 5589 break; 5590 } 5591 /* take care of ECN, part 1. */ 5592 if (stcb->asoc.ecn_allowed && 5593 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5594 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5595 } 5596 /* plow through the data chunks while length > offset */ 5597 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5598 inp, stcb, net, &high_tsn); 5599 if (retval == 2) { 5600 /* 5601 * The association aborted, NO UNLOCK needed since 5602 * the association is destroyed. 5603 */ 5604 goto out_now; 5605 } 5606 data_processed = 1; 5607 if (retval == 0) { 5608 /* take care of ecn part 2. */ 5609 if (stcb->asoc.ecn_allowed && 5610 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5611 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5612 ecn_bits); 5613 } 5614 } 5615 /* 5616 * Anything important needs to have been m_copy'ed in 5617 * process_data 5618 */ 5619 } 5620 if ((data_processed == 0) && (fwd_tsn_seen)) { 5621 int was_a_gap = 0; 5622 5623 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5624 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5625 /* there was a gap before this data was processed */ 5626 was_a_gap = 1; 5627 } 5628 stcb->asoc.send_sack = 1; 5629 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5630 if (abort_flag) { 5631 /* Again, we aborted so NO UNLOCK needed */ 5632 goto out_now; 5633 } 5634 } else if (fwd_tsn_seen) { 5635 stcb->asoc.send_sack = 1; 5636 } 5637 /* trigger send of any chunks in queue... */ 5638 trigger_send: 5639 #ifdef SCTP_AUDITING_ENABLED 5640 sctp_audit_log(0xE0, 2); 5641 sctp_auditing(1, inp, stcb, net); 5642 #endif 5643 SCTPDBG(SCTP_DEBUG_INPUT1, 5644 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5645 stcb->asoc.peers_rwnd, 5646 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5647 stcb->asoc.total_flight); 5648 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5649 5650 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5651 ((un_sent) && 5652 (stcb->asoc.peers_rwnd > 0 || 5653 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5654 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5655 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5656 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5657 } 5658 #ifdef SCTP_AUDITING_ENABLED 5659 sctp_audit_log(0xE0, 3); 5660 sctp_auditing(2, inp, stcb, net); 5661 #endif 5662 SCTP_TCB_UNLOCK(stcb); 5663 out_now: 5664 #ifdef INVARIANTS 5665 sctp_validate_no_locks(inp); 5666 #endif 5667 return; 5668 } 5669 5670 #if 0 5671 static void 5672 sctp_print_mbuf_chain(struct mbuf *m) 5673 { 5674 for (; m; m = SCTP_BUF_NEXT(m)) { 5675 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5676 if (SCTP_BUF_IS_EXTENDED(m)) 5677 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5678 } 5679 } 5680 5681 #endif 5682 5683 void 5684 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5685 { 5686 #ifdef SCTP_MBUF_LOGGING 5687 struct mbuf *mat; 5688 5689 #endif 5690 struct mbuf *m; 5691 int iphlen; 5692 uint32_t vrf_id = 0; 5693 uint8_t ecn_bits; 5694 struct ip *ip; 5695 struct sctphdr *sh; 5696 struct sctp_inpcb *inp = NULL; 5697 5698 uint32_t check, calc_check; 5699 struct sctp_nets *net; 5700 struct sctp_tcb *stcb = NULL; 5701 struct sctp_chunkhdr *ch; 5702 int refcount_up = 0; 5703 int length, mlen, offset; 5704 5705 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5706 SCTP_RELEASE_PKT(i_pak); 5707 return; 5708 } 5709 mlen = SCTP_HEADER_LEN(i_pak); 5710 iphlen = off; 5711 m = SCTP_HEADER_TO_CHAIN(i_pak); 5712 5713 net = NULL; 5714 SCTP_STAT_INCR(sctps_recvpackets); 5715 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5716 5717 5718 #ifdef SCTP_MBUF_LOGGING 5719 /* Log in any input mbufs */ 5720 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5721 mat = m; 5722 while (mat) { 5723 if (SCTP_BUF_IS_EXTENDED(mat)) { 5724 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5725 } 5726 mat = SCTP_BUF_NEXT(mat); 5727 } 5728 } 5729 #endif 5730 #ifdef SCTP_PACKET_LOGGING 5731 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5732 sctp_packet_log(m, mlen); 5733 #endif 5734 /* 5735 * Must take out the iphlen, since mlen expects this (only effect lb 5736 * case) 5737 */ 5738 mlen -= iphlen; 5739 5740 /* 5741 * Get IP, SCTP, and first chunk header together in first mbuf. 5742 */ 5743 ip = mtod(m, struct ip *); 5744 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5745 if (SCTP_BUF_LEN(m) < offset) { 5746 if ((m = m_pullup(m, offset)) == 0) { 5747 SCTP_STAT_INCR(sctps_hdrops); 5748 return; 5749 } 5750 ip = mtod(m, struct ip *); 5751 } 5752 /* validate mbuf chain length with IP payload length */ 5753 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5754 SCTP_STAT_INCR(sctps_hdrops); 5755 goto bad; 5756 } 5757 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5758 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5759 SCTPDBG(SCTP_DEBUG_INPUT1, 5760 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5761 5762 /* SCTP does not allow broadcasts or multicasts */ 5763 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5764 goto bad; 5765 } 5766 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5767 /* 5768 * We only look at broadcast if its a front state, All 5769 * others we will not have a tcb for anyway. 5770 */ 5771 goto bad; 5772 } 5773 /* validate SCTP checksum */ 5774 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5775 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5776 m->m_pkthdr.len, 5777 if_name(m->m_pkthdr.rcvif), 5778 m->m_pkthdr.csum_flags); 5779 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5780 SCTP_STAT_INCR(sctps_recvhwcrc); 5781 goto sctp_skip_csum_4; 5782 } 5783 check = sh->checksum; /* save incoming checksum */ 5784 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5785 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5786 (SCTP_IS_IT_LOOPBACK(m))) 5787 ) { 5788 SCTP_STAT_INCR(sctps_recvnocrc); 5789 goto sctp_skip_csum_4; 5790 } 5791 sh->checksum = 0; /* prepare for calc */ 5792 calc_check = sctp_calculate_cksum(m, iphlen); 5793 sh->checksum = check; 5794 SCTP_STAT_INCR(sctps_recvswcrc); 5795 if (calc_check != check) { 5796 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5797 calc_check, check, m, mlen, iphlen); 5798 5799 stcb = sctp_findassociation_addr(m, iphlen, 5800 offset - sizeof(*ch), 5801 sh, ch, &inp, &net, 5802 vrf_id); 5803 if ((net) && (port)) { 5804 if (net->port == 0) { 5805 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5806 } 5807 net->port = port; 5808 } 5809 if ((inp) && (stcb)) { 5810 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5811 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5812 } else if ((inp != NULL) && (stcb == NULL)) { 5813 refcount_up = 1; 5814 } 5815 SCTP_STAT_INCR(sctps_badsum); 5816 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5817 goto bad; 5818 } 5819 sctp_skip_csum_4: 5820 /* destination port of 0 is illegal, based on RFC2960. */ 5821 if (sh->dest_port == 0) { 5822 SCTP_STAT_INCR(sctps_hdrops); 5823 goto bad; 5824 } 5825 /* 5826 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5827 * IP/SCTP/first chunk header... 5828 */ 5829 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5830 sh, ch, &inp, &net, vrf_id); 5831 if ((net) && (port)) { 5832 if (net->port == 0) { 5833 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5834 } 5835 net->port = port; 5836 } 5837 /* inp's ref-count increased && stcb locked */ 5838 if (inp == NULL) { 5839 struct sctp_init_chunk *init_chk, chunk_buf; 5840 5841 SCTP_STAT_INCR(sctps_noport); 5842 #ifdef ICMP_BANDLIM 5843 /* 5844 * we use the bandwidth limiting to protect against sending 5845 * too many ABORTS all at once. In this case these count the 5846 * same as an ICMP message. 5847 */ 5848 if (badport_bandlim(0) < 0) 5849 goto bad; 5850 #endif /* ICMP_BANDLIM */ 5851 SCTPDBG(SCTP_DEBUG_INPUT1, 5852 "Sending a ABORT from packet entry!\n"); 5853 if (ch->chunk_type == SCTP_INITIATION) { 5854 /* 5855 * we do a trick here to get the INIT tag, dig in 5856 * and get the tag from the INIT and put it in the 5857 * common header. 5858 */ 5859 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5860 iphlen + sizeof(*sh), sizeof(*init_chk), 5861 (uint8_t *) & chunk_buf); 5862 if (init_chk != NULL) 5863 sh->v_tag = init_chk->init.initiate_tag; 5864 } 5865 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5866 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5867 goto bad; 5868 } 5869 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5870 goto bad; 5871 } 5872 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5873 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5874 goto bad; 5875 } else if (stcb == NULL) { 5876 refcount_up = 1; 5877 } 5878 #ifdef IPSEC 5879 /* 5880 * I very much doubt any of the IPSEC stuff will work but I have no 5881 * idea, so I will leave it in place. 5882 */ 5883 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5884 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5885 SCTP_STAT_INCR(sctps_hdrops); 5886 goto bad; 5887 } 5888 #endif /* IPSEC */ 5889 5890 /* 5891 * common chunk processing 5892 */ 5893 length = ip->ip_len + iphlen; 5894 offset -= sizeof(struct sctp_chunkhdr); 5895 5896 ecn_bits = ip->ip_tos; 5897 5898 /* sa_ignore NO_NULL_CHK */ 5899 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5900 inp, stcb, net, ecn_bits, vrf_id, port); 5901 /* inp's ref-count reduced && stcb unlocked */ 5902 if (m) { 5903 sctp_m_freem(m); 5904 } 5905 if ((inp) && (refcount_up)) { 5906 /* reduce ref-count */ 5907 SCTP_INP_DECR_REF(inp); 5908 } 5909 return; 5910 bad: 5911 if (stcb) { 5912 SCTP_TCB_UNLOCK(stcb); 5913 } 5914 if ((inp) && (refcount_up)) { 5915 /* reduce ref-count */ 5916 SCTP_INP_DECR_REF(inp); 5917 } 5918 if (m) { 5919 sctp_m_freem(m); 5920 } 5921 return; 5922 } 5923 void 5924 sctp_input(i_pak, off) 5925 struct mbuf *i_pak; 5926 int off; 5927 { 5928 sctp_input_with_port(i_pak, off, 0); 5929 } 5930