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sys/netinet/sctp_input.c
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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: releng/8.1/sys/netinet/sctp_input.c 209028 2010-06-11 03:13:19Z rrs $"); 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 2747 /* 2748 * This is where the one-2-one socket is put into 2749 * the accept state waiting for the accept! 2750 */ 2751 if (*stcb) { 2752 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2753 } 2754 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2755 2756 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2757 SCTP_TCB_UNLOCK((*stcb)); 2758 2759 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2760 0); 2761 SCTP_TCB_LOCK((*stcb)); 2762 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2763 2764 2765 /* 2766 * now we must check to see if we were aborted while 2767 * the move was going on and the lock/unlock 2768 * happened. 2769 */ 2770 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2771 /* 2772 * yep it was, we leave the assoc attached 2773 * to the socket since the sctp_inpcb_free() 2774 * call will send an abort for us. 2775 */ 2776 SCTP_INP_DECR_REF(inp); 2777 return (NULL); 2778 } 2779 SCTP_INP_DECR_REF(inp); 2780 /* Switch over to the new guy */ 2781 *inp_p = inp; 2782 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2783 2784 /* 2785 * Pull it from the incomplete queue and wake the 2786 * guy 2787 */ 2788 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2789 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2790 SCTP_TCB_UNLOCK((*stcb)); 2791 SCTP_SOCKET_LOCK(so, 1); 2792 #endif 2793 soisconnected(so); 2794 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2795 SCTP_TCB_LOCK((*stcb)); 2796 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2797 SCTP_SOCKET_UNLOCK(so, 1); 2798 #endif 2799 return (m); 2800 } 2801 } 2802 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2803 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2804 } 2805 return (m); 2806 } 2807 2808 static void 2809 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2810 struct sctp_tcb *stcb, struct sctp_nets *net) 2811 { 2812 /* cp must not be used, others call this without a c-ack :-) */ 2813 struct sctp_association *asoc; 2814 2815 SCTPDBG(SCTP_DEBUG_INPUT2, 2816 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2817 if (stcb == NULL) 2818 return; 2819 2820 asoc = &stcb->asoc; 2821 2822 sctp_stop_all_cookie_timers(stcb); 2823 /* process according to association state */ 2824 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2825 /* state change only needed when I am in right state */ 2826 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2827 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2828 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2829 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2830 stcb->sctp_ep, stcb, asoc->primary_destination); 2831 2832 } 2833 /* update RTO */ 2834 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2835 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2836 if (asoc->overall_error_count == 0) { 2837 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2838 &asoc->time_entered, sctp_align_safe_nocopy); 2839 } 2840 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2841 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2842 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2843 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2844 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2845 struct socket *so; 2846 2847 #endif 2848 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2849 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2850 so = SCTP_INP_SO(stcb->sctp_ep); 2851 atomic_add_int(&stcb->asoc.refcnt, 1); 2852 SCTP_TCB_UNLOCK(stcb); 2853 SCTP_SOCKET_LOCK(so, 1); 2854 SCTP_TCB_LOCK(stcb); 2855 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2856 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2857 SCTP_SOCKET_UNLOCK(so, 1); 2858 return; 2859 } 2860 #endif 2861 soisconnected(stcb->sctp_socket); 2862 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2863 SCTP_SOCKET_UNLOCK(so, 1); 2864 #endif 2865 } 2866 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2867 stcb, net); 2868 /* 2869 * since we did not send a HB make sure we don't double 2870 * things 2871 */ 2872 net->hb_responded = 1; 2873 2874 if (stcb->asoc.sctp_autoclose_ticks && 2875 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2876 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2877 stcb->sctp_ep, stcb, NULL); 2878 } 2879 /* 2880 * send ASCONF if parameters are pending and ASCONFs are 2881 * allowed (eg. addresses changed when init/cookie echo were 2882 * in flight) 2883 */ 2884 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2885 (stcb->asoc.peer_supports_asconf) && 2886 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2887 #ifdef SCTP_TIMER_BASED_ASCONF 2888 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2889 stcb->sctp_ep, stcb, 2890 stcb->asoc.primary_destination); 2891 #else 2892 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2893 SCTP_ADDR_NOT_LOCKED); 2894 #endif 2895 } 2896 } 2897 /* Toss the cookie if I can */ 2898 sctp_toss_old_cookies(stcb, asoc); 2899 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2900 /* Restart the timer if we have pending data */ 2901 struct sctp_tmit_chunk *chk; 2902 2903 chk = TAILQ_FIRST(&asoc->sent_queue); 2904 if (chk) { 2905 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2906 stcb, chk->whoTo); 2907 } 2908 } 2909 } 2910 2911 static void 2912 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2913 struct sctp_tcb *stcb) 2914 { 2915 struct sctp_nets *net; 2916 struct sctp_tmit_chunk *lchk; 2917 uint32_t tsn; 2918 2919 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2920 return; 2921 } 2922 SCTP_STAT_INCR(sctps_recvecne); 2923 tsn = ntohl(cp->tsn); 2924 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2925 /* Also we make sure we disable the nonce_wait */ 2926 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2927 if (lchk == NULL) { 2928 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2929 } else { 2930 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2931 } 2932 stcb->asoc.nonce_wait_for_ecne = 0; 2933 stcb->asoc.nonce_sum_check = 0; 2934 2935 /* Find where it was sent, if possible */ 2936 net = NULL; 2937 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2938 while (lchk) { 2939 if (lchk->rec.data.TSN_seq == tsn) { 2940 net = lchk->whoTo; 2941 break; 2942 } 2943 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2944 break; 2945 lchk = TAILQ_NEXT(lchk, sctp_next); 2946 } 2947 if (net == NULL) 2948 /* default is we use the primary */ 2949 net = stcb->asoc.primary_destination; 2950 2951 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2952 /* 2953 * JRS - Use the congestion control given in the pluggable 2954 * CC module 2955 */ 2956 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2957 /* 2958 * we reduce once every RTT. So we will only lower cwnd at 2959 * the next sending seq i.e. the resync_tsn. 2960 */ 2961 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2962 } 2963 /* 2964 * We always send a CWR this way if our previous one was lost our 2965 * peer will get an update, or if it is not time again to reduce we 2966 * still get the cwr to the peer. 2967 */ 2968 sctp_send_cwr(stcb, net, tsn); 2969 } 2970 2971 static void 2972 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2973 { 2974 /* 2975 * Here we get a CWR from the peer. We must look in the outqueue and 2976 * make sure that we have a covered ECNE in teh control chunk part. 2977 * If so remove it. 2978 */ 2979 struct sctp_tmit_chunk *chk; 2980 struct sctp_ecne_chunk *ecne; 2981 2982 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2983 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2984 continue; 2985 } 2986 /* 2987 * Look for and remove if it is the right TSN. Since there 2988 * is only ONE ECNE on the control queue at any one time we 2989 * don't need to worry about more than one! 2990 */ 2991 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2992 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2993 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2994 /* this covers this ECNE, we can remove it */ 2995 stcb->asoc.ecn_echo_cnt_onq--; 2996 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2997 sctp_next); 2998 if (chk->data) { 2999 sctp_m_freem(chk->data); 3000 chk->data = NULL; 3001 } 3002 stcb->asoc.ctrl_queue_cnt--; 3003 sctp_free_a_chunk(stcb, chk); 3004 break; 3005 } 3006 } 3007 } 3008 3009 static void 3010 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3011 struct sctp_tcb *stcb, struct sctp_nets *net) 3012 { 3013 struct sctp_association *asoc; 3014 3015 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3016 struct socket *so; 3017 3018 #endif 3019 3020 SCTPDBG(SCTP_DEBUG_INPUT2, 3021 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3022 if (stcb == NULL) 3023 return; 3024 3025 asoc = &stcb->asoc; 3026 /* process according to association state */ 3027 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3028 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3029 SCTPDBG(SCTP_DEBUG_INPUT2, 3030 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3031 SCTP_TCB_UNLOCK(stcb); 3032 return; 3033 } 3034 /* notify upper layer protocol */ 3035 if (stcb->sctp_socket) { 3036 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3037 /* are the queues empty? they should be */ 3038 if (!TAILQ_EMPTY(&asoc->send_queue) || 3039 !TAILQ_EMPTY(&asoc->sent_queue) || 3040 !TAILQ_EMPTY(&asoc->out_wheel)) { 3041 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3042 } 3043 } 3044 /* stop the timer */ 3045 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3046 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3047 /* free the TCB */ 3048 SCTPDBG(SCTP_DEBUG_INPUT2, 3049 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3050 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3051 so = SCTP_INP_SO(stcb->sctp_ep); 3052 atomic_add_int(&stcb->asoc.refcnt, 1); 3053 SCTP_TCB_UNLOCK(stcb); 3054 SCTP_SOCKET_LOCK(so, 1); 3055 SCTP_TCB_LOCK(stcb); 3056 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3057 #endif 3058 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3059 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3060 SCTP_SOCKET_UNLOCK(so, 1); 3061 #endif 3062 return; 3063 } 3064 3065 static int 3066 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3067 struct sctp_nets *net, uint8_t flg) 3068 { 3069 switch (desc->chunk_type) { 3070 case SCTP_DATA: 3071 /* find the tsn to resend (possibly */ 3072 { 3073 uint32_t tsn; 3074 struct sctp_tmit_chunk *tp1; 3075 3076 tsn = ntohl(desc->tsn_ifany); 3077 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3078 while (tp1) { 3079 if (tp1->rec.data.TSN_seq == tsn) { 3080 /* found it */ 3081 break; 3082 } 3083 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3084 MAX_TSN)) { 3085 /* not found */ 3086 tp1 = NULL; 3087 break; 3088 } 3089 tp1 = TAILQ_NEXT(tp1, sctp_next); 3090 } 3091 if (tp1 == NULL) { 3092 /* 3093 * Do it the other way , aka without paying 3094 * attention to queue seq order. 3095 */ 3096 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3097 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3098 while (tp1) { 3099 if (tp1->rec.data.TSN_seq == tsn) { 3100 /* found it */ 3101 break; 3102 } 3103 tp1 = TAILQ_NEXT(tp1, sctp_next); 3104 } 3105 } 3106 if (tp1 == NULL) { 3107 SCTP_STAT_INCR(sctps_pdrptsnnf); 3108 } 3109 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3110 uint8_t *ddp; 3111 3112 if ((stcb->asoc.peers_rwnd == 0) && 3113 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3114 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3115 return (0); 3116 } 3117 if (stcb->asoc.peers_rwnd == 0 && 3118 (flg & SCTP_FROM_MIDDLE_BOX)) { 3119 SCTP_STAT_INCR(sctps_pdrpdizrw); 3120 return (0); 3121 } 3122 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3123 sizeof(struct sctp_data_chunk)); 3124 { 3125 unsigned int iii; 3126 3127 for (iii = 0; iii < sizeof(desc->data_bytes); 3128 iii++) { 3129 if (ddp[iii] != desc->data_bytes[iii]) { 3130 SCTP_STAT_INCR(sctps_pdrpbadd); 3131 return (-1); 3132 } 3133 } 3134 } 3135 /* 3136 * We zero out the nonce so resync not 3137 * needed 3138 */ 3139 tp1->rec.data.ect_nonce = 0; 3140 3141 if (tp1->do_rtt) { 3142 /* 3143 * this guy had a RTO calculation 3144 * pending on it, cancel it 3145 */ 3146 tp1->do_rtt = 0; 3147 } 3148 SCTP_STAT_INCR(sctps_pdrpmark); 3149 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3150 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3151 tp1->sent = SCTP_DATAGRAM_RESEND; 3152 /* 3153 * mark it as if we were doing a FR, since 3154 * we will be getting gap ack reports behind 3155 * the info from the router. 3156 */ 3157 tp1->rec.data.doing_fast_retransmit = 1; 3158 /* 3159 * mark the tsn with what sequences can 3160 * cause a new FR. 3161 */ 3162 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3163 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3164 } else { 3165 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3166 } 3167 3168 /* restart the timer */ 3169 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3170 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3171 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3172 stcb, tp1->whoTo); 3173 3174 /* fix counts and things */ 3175 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3176 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3177 tp1->whoTo->flight_size, 3178 tp1->book_size, 3179 (uintptr_t) stcb, 3180 tp1->rec.data.TSN_seq); 3181 } 3182 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3183 sctp_flight_size_decrease(tp1); 3184 sctp_total_flight_decrease(stcb, tp1); 3185 } 3186 } { 3187 /* audit code */ 3188 unsigned int audit; 3189 3190 audit = 0; 3191 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3192 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3193 audit++; 3194 } 3195 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3196 sctp_next) { 3197 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3198 audit++; 3199 } 3200 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3201 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3202 audit, stcb->asoc.sent_queue_retran_cnt); 3203 #ifndef SCTP_AUDITING_ENABLED 3204 stcb->asoc.sent_queue_retran_cnt = audit; 3205 #endif 3206 } 3207 } 3208 } 3209 break; 3210 case SCTP_ASCONF: 3211 { 3212 struct sctp_tmit_chunk *asconf; 3213 3214 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3215 sctp_next) { 3216 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3217 break; 3218 } 3219 } 3220 if (asconf) { 3221 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3222 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3223 asconf->sent = SCTP_DATAGRAM_RESEND; 3224 asconf->snd_count--; 3225 } 3226 } 3227 break; 3228 case SCTP_INITIATION: 3229 /* resend the INIT */ 3230 stcb->asoc.dropped_special_cnt++; 3231 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3232 /* 3233 * If we can get it in, in a few attempts we do 3234 * this, otherwise we let the timer fire. 3235 */ 3236 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3237 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3238 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3239 } 3240 break; 3241 case SCTP_SELECTIVE_ACK: 3242 case SCTP_NR_SELECTIVE_ACK: 3243 /* resend the sack */ 3244 sctp_send_sack(stcb); 3245 break; 3246 case SCTP_HEARTBEAT_REQUEST: 3247 /* resend a demand HB */ 3248 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3249 /* 3250 * Only retransmit if we KNOW we wont destroy the 3251 * tcb 3252 */ 3253 (void)sctp_send_hb(stcb, 1, net); 3254 } 3255 break; 3256 case SCTP_SHUTDOWN: 3257 sctp_send_shutdown(stcb, net); 3258 break; 3259 case SCTP_SHUTDOWN_ACK: 3260 sctp_send_shutdown_ack(stcb, net); 3261 break; 3262 case SCTP_COOKIE_ECHO: 3263 { 3264 struct sctp_tmit_chunk *cookie; 3265 3266 cookie = NULL; 3267 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3268 sctp_next) { 3269 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3270 break; 3271 } 3272 } 3273 if (cookie) { 3274 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3275 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3276 cookie->sent = SCTP_DATAGRAM_RESEND; 3277 sctp_stop_all_cookie_timers(stcb); 3278 } 3279 } 3280 break; 3281 case SCTP_COOKIE_ACK: 3282 sctp_send_cookie_ack(stcb); 3283 break; 3284 case SCTP_ASCONF_ACK: 3285 /* resend last asconf ack */ 3286 sctp_send_asconf_ack(stcb); 3287 break; 3288 case SCTP_FORWARD_CUM_TSN: 3289 send_forward_tsn(stcb, &stcb->asoc); 3290 break; 3291 /* can't do anything with these */ 3292 case SCTP_PACKET_DROPPED: 3293 case SCTP_INITIATION_ACK: /* this should not happen */ 3294 case SCTP_HEARTBEAT_ACK: 3295 case SCTP_ABORT_ASSOCIATION: 3296 case SCTP_OPERATION_ERROR: 3297 case SCTP_SHUTDOWN_COMPLETE: 3298 case SCTP_ECN_ECHO: 3299 case SCTP_ECN_CWR: 3300 default: 3301 break; 3302 } 3303 return (0); 3304 } 3305 3306 void 3307 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3308 { 3309 int i; 3310 uint16_t temp; 3311 3312 /* 3313 * We set things to 0xffff since this is the last delivered sequence 3314 * and we will be sending in 0 after the reset. 3315 */ 3316 3317 if (number_entries) { 3318 for (i = 0; i < number_entries; i++) { 3319 temp = ntohs(list[i]); 3320 if (temp >= stcb->asoc.streamincnt) { 3321 continue; 3322 } 3323 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3324 } 3325 } else { 3326 list = NULL; 3327 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3328 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3329 } 3330 } 3331 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3332 } 3333 3334 static void 3335 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3336 { 3337 int i; 3338 3339 if (number_entries == 0) { 3340 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3341 stcb->asoc.strmout[i].next_sequence_sent = 0; 3342 } 3343 } else if (number_entries) { 3344 for (i = 0; i < number_entries; i++) { 3345 uint16_t temp; 3346 3347 temp = ntohs(list[i]); 3348 if (temp >= stcb->asoc.streamoutcnt) { 3349 /* no such stream */ 3350 continue; 3351 } 3352 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3353 } 3354 } 3355 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3356 } 3357 3358 3359 struct sctp_stream_reset_out_request * 3360 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3361 { 3362 struct sctp_association *asoc; 3363 struct sctp_stream_reset_out_req *req; 3364 struct sctp_stream_reset_out_request *r; 3365 struct sctp_tmit_chunk *chk; 3366 int len, clen; 3367 3368 asoc = &stcb->asoc; 3369 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3370 asoc->stream_reset_outstanding = 0; 3371 return (NULL); 3372 } 3373 if (stcb->asoc.str_reset == NULL) { 3374 asoc->stream_reset_outstanding = 0; 3375 return (NULL); 3376 } 3377 chk = stcb->asoc.str_reset; 3378 if (chk->data == NULL) { 3379 return (NULL); 3380 } 3381 if (bchk) { 3382 /* he wants a copy of the chk pointer */ 3383 *bchk = chk; 3384 } 3385 clen = chk->send_size; 3386 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3387 r = &req->sr_req; 3388 if (ntohl(r->request_seq) == seq) { 3389 /* found it */ 3390 return (r); 3391 } 3392 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3393 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3394 /* move to the next one, there can only be a max of two */ 3395 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3396 if (ntohl(r->request_seq) == seq) { 3397 return (r); 3398 } 3399 } 3400 /* that seq is not here */ 3401 return (NULL); 3402 } 3403 3404 static void 3405 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3406 { 3407 struct sctp_association *asoc; 3408 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3409 3410 if (stcb->asoc.str_reset == NULL) { 3411 return; 3412 } 3413 asoc = &stcb->asoc; 3414 3415 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3416 TAILQ_REMOVE(&asoc->control_send_queue, 3417 chk, 3418 sctp_next); 3419 if (chk->data) { 3420 sctp_m_freem(chk->data); 3421 chk->data = NULL; 3422 } 3423 asoc->ctrl_queue_cnt--; 3424 sctp_free_a_chunk(stcb, chk); 3425 /* sa_ignore NO_NULL_CHK */ 3426 stcb->asoc.str_reset = NULL; 3427 } 3428 3429 3430 static int 3431 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3432 uint32_t seq, uint32_t action, 3433 struct sctp_stream_reset_response *respin) 3434 { 3435 uint16_t type; 3436 int lparm_len; 3437 struct sctp_association *asoc = &stcb->asoc; 3438 struct sctp_tmit_chunk *chk; 3439 struct sctp_stream_reset_out_request *srparam; 3440 int number_entries; 3441 3442 if (asoc->stream_reset_outstanding == 0) { 3443 /* duplicate */ 3444 return (0); 3445 } 3446 if (seq == stcb->asoc.str_reset_seq_out) { 3447 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3448 if (srparam) { 3449 stcb->asoc.str_reset_seq_out++; 3450 type = ntohs(srparam->ph.param_type); 3451 lparm_len = ntohs(srparam->ph.param_length); 3452 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3453 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3454 asoc->stream_reset_out_is_outstanding = 0; 3455 if (asoc->stream_reset_outstanding) 3456 asoc->stream_reset_outstanding--; 3457 if (action == SCTP_STREAM_RESET_PERFORMED) { 3458 /* do it */ 3459 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3460 } else { 3461 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3462 } 3463 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3464 /* Answered my request */ 3465 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3466 if (asoc->stream_reset_outstanding) 3467 asoc->stream_reset_outstanding--; 3468 if (action != SCTP_STREAM_RESET_PERFORMED) { 3469 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3470 } 3471 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3472 /* Ok we now may have more streams */ 3473 if (asoc->stream_reset_outstanding) 3474 asoc->stream_reset_outstanding--; 3475 if (action == SCTP_STREAM_RESET_PERFORMED) { 3476 /* Put the new streams into effect */ 3477 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3478 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3479 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3480 } else { 3481 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3482 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3483 } 3484 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3485 /** 3486 * a) Adopt the new in tsn. 3487 * b) reset the map 3488 * c) Adopt the new out-tsn 3489 */ 3490 struct sctp_stream_reset_response_tsn *resp; 3491 struct sctp_forward_tsn_chunk fwdtsn; 3492 int abort_flag = 0; 3493 3494 if (respin == NULL) { 3495 /* huh ? */ 3496 return (0); 3497 } 3498 if (action == SCTP_STREAM_RESET_PERFORMED) { 3499 resp = (struct sctp_stream_reset_response_tsn *)respin; 3500 asoc->stream_reset_outstanding--; 3501 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3502 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3503 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3504 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3505 if (abort_flag) { 3506 return (1); 3507 } 3508 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3509 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3510 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3511 } 3512 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3513 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3514 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3515 3516 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3517 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3518 3519 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3520 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3521 3522 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3523 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3524 3525 } 3526 } 3527 /* get rid of the request and get the request flags */ 3528 if (asoc->stream_reset_outstanding == 0) { 3529 sctp_clean_up_stream_reset(stcb); 3530 } 3531 } 3532 } 3533 return (0); 3534 } 3535 3536 static void 3537 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3538 struct sctp_tmit_chunk *chk, 3539 struct sctp_stream_reset_in_request *req, int trunc) 3540 { 3541 uint32_t seq; 3542 int len, i; 3543 int number_entries; 3544 uint16_t temp; 3545 3546 /* 3547 * peer wants me to send a str-reset to him for my outgoing seq's if 3548 * seq_in is right. 3549 */ 3550 struct sctp_association *asoc = &stcb->asoc; 3551 3552 seq = ntohl(req->request_seq); 3553 if (asoc->str_reset_seq_in == seq) { 3554 if (trunc) { 3555 /* Can't do it, since they exceeded our buffer size */ 3556 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3557 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3558 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3559 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3560 len = ntohs(req->ph.param_length); 3561 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3562 for (i = 0; i < number_entries; i++) { 3563 temp = ntohs(req->list_of_streams[i]); 3564 req->list_of_streams[i] = temp; 3565 } 3566 /* move the reset action back one */ 3567 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3568 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3569 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3570 asoc->str_reset_seq_out, 3571 seq, (asoc->sending_seq - 1)); 3572 asoc->stream_reset_out_is_outstanding = 1; 3573 asoc->str_reset = chk; 3574 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3575 stcb->asoc.stream_reset_outstanding++; 3576 } else { 3577 /* Can't do it, since we have sent one out */ 3578 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3579 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3580 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3581 } 3582 asoc->str_reset_seq_in++; 3583 } else if (asoc->str_reset_seq_in - 1 == seq) { 3584 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3585 } else if (asoc->str_reset_seq_in - 2 == seq) { 3586 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3587 } else { 3588 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3589 } 3590 } 3591 3592 static int 3593 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3594 struct sctp_tmit_chunk *chk, 3595 struct sctp_stream_reset_tsn_request *req) 3596 { 3597 /* reset all in and out and update the tsn */ 3598 /* 3599 * A) reset my str-seq's on in and out. B) Select a receive next, 3600 * and set cum-ack to it. Also process this selected number as a 3601 * fwd-tsn as well. C) set in the response my next sending seq. 3602 */ 3603 struct sctp_forward_tsn_chunk fwdtsn; 3604 struct sctp_association *asoc = &stcb->asoc; 3605 int abort_flag = 0; 3606 uint32_t seq; 3607 3608 seq = ntohl(req->request_seq); 3609 if (asoc->str_reset_seq_in == seq) { 3610 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3611 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3612 fwdtsn.ch.chunk_flags = 0; 3613 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3614 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3615 if (abort_flag) { 3616 return (1); 3617 } 3618 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3619 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3620 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3621 } 3622 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3623 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3624 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3625 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3626 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3627 atomic_add_int(&stcb->asoc.sending_seq, 1); 3628 /* save off historical data for retrans */ 3629 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3630 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3631 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3632 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3633 3634 sctp_add_stream_reset_result_tsn(chk, 3635 ntohl(req->request_seq), 3636 SCTP_STREAM_RESET_PERFORMED, 3637 stcb->asoc.sending_seq, 3638 stcb->asoc.mapping_array_base_tsn); 3639 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3640 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3641 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3642 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3643 3644 asoc->str_reset_seq_in++; 3645 } else if (asoc->str_reset_seq_in - 1 == seq) { 3646 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3647 stcb->asoc.last_sending_seq[0], 3648 stcb->asoc.last_base_tsnsent[0] 3649 ); 3650 } else if (asoc->str_reset_seq_in - 2 == seq) { 3651 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3652 stcb->asoc.last_sending_seq[1], 3653 stcb->asoc.last_base_tsnsent[1] 3654 ); 3655 } else { 3656 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3657 } 3658 return (0); 3659 } 3660 3661 static void 3662 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3663 struct sctp_tmit_chunk *chk, 3664 struct sctp_stream_reset_out_request *req, int trunc) 3665 { 3666 uint32_t seq, tsn; 3667 int number_entries, len; 3668 struct sctp_association *asoc = &stcb->asoc; 3669 3670 seq = ntohl(req->request_seq); 3671 3672 /* now if its not a duplicate we process it */ 3673 if (asoc->str_reset_seq_in == seq) { 3674 len = ntohs(req->ph.param_length); 3675 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3676 /* 3677 * the sender is resetting, handle the list issue.. we must 3678 * a) verify if we can do the reset, if so no problem b) If 3679 * we can't do the reset we must copy the request. c) queue 3680 * it, and setup the data in processor to trigger it off 3681 * when needed and dequeue all the queued data. 3682 */ 3683 tsn = ntohl(req->send_reset_at_tsn); 3684 3685 /* move the reset action back one */ 3686 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3687 if (trunc) { 3688 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3689 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3690 } else if ((tsn == asoc->cumulative_tsn) || 3691 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3692 /* we can do it now */ 3693 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3694 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3695 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3696 } else { 3697 /* 3698 * we must queue it up and thus wait for the TSN's 3699 * to arrive that are at or before tsn 3700 */ 3701 struct sctp_stream_reset_list *liste; 3702 int siz; 3703 3704 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3705 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3706 siz, SCTP_M_STRESET); 3707 if (liste == NULL) { 3708 /* gak out of memory */ 3709 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3710 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3711 return; 3712 } 3713 liste->tsn = tsn; 3714 liste->number_entries = number_entries; 3715 memcpy(&liste->req, req, 3716 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3717 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3718 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3719 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3720 } 3721 asoc->str_reset_seq_in++; 3722 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3723 /* 3724 * one seq back, just echo back last action since my 3725 * response was lost. 3726 */ 3727 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3728 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3729 /* 3730 * two seq back, just echo back last action since my 3731 * response was lost. 3732 */ 3733 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3734 } else { 3735 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3736 } 3737 } 3738 3739 static void 3740 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3741 struct sctp_stream_reset_add_strm *str_add) 3742 { 3743 /* 3744 * Peer is requesting to add more streams. If its within our 3745 * max-streams we will allow it. 3746 */ 3747 uint16_t num_stream, i; 3748 uint32_t seq; 3749 struct sctp_association *asoc = &stcb->asoc; 3750 struct sctp_queued_to_read *ctl; 3751 3752 /* Get the number. */ 3753 seq = ntohl(str_add->request_seq); 3754 num_stream = ntohs(str_add->number_of_streams); 3755 /* Now what would be the new total? */ 3756 if (asoc->str_reset_seq_in == seq) { 3757 num_stream += stcb->asoc.streamincnt; 3758 if (num_stream > stcb->asoc.max_inbound_streams) { 3759 /* We must reject it they ask for to many */ 3760 denied: 3761 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3762 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3763 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3764 } else { 3765 /* Ok, we can do that :-) */ 3766 struct sctp_stream_in *oldstrm; 3767 3768 /* save off the old */ 3769 oldstrm = stcb->asoc.strmin; 3770 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3771 (num_stream * sizeof(struct sctp_stream_in)), 3772 SCTP_M_STRMI); 3773 if (stcb->asoc.strmin == NULL) { 3774 stcb->asoc.strmin = oldstrm; 3775 goto denied; 3776 } 3777 /* copy off the old data */ 3778 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3779 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3780 stcb->asoc.strmin[i].stream_no = i; 3781 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3782 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3783 /* now anything on those queues? */ 3784 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) { 3785 ctl = TAILQ_FIRST(&oldstrm[i].inqueue); 3786 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3787 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3788 } 3789 } 3790 /* Init the new streams */ 3791 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3792 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3793 stcb->asoc.strmin[i].stream_no = i; 3794 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3795 stcb->asoc.strmin[i].delivery_started = 0; 3796 } 3797 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3798 /* update the size */ 3799 stcb->asoc.streamincnt = num_stream; 3800 /* Send the ack */ 3801 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3802 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3803 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3804 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3805 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3806 } 3807 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3808 /* 3809 * one seq back, just echo back last action since my 3810 * response was lost. 3811 */ 3812 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3813 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3814 /* 3815 * two seq back, just echo back last action since my 3816 * response was lost. 3817 */ 3818 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3819 } else { 3820 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3821 3822 } 3823 } 3824 3825 #ifdef __GNUC__ 3826 __attribute__((noinline)) 3827 #endif 3828 static int 3829 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3830 struct sctp_stream_reset_out_req *sr_req) 3831 { 3832 int chk_length, param_len, ptype; 3833 struct sctp_paramhdr pstore; 3834 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3835 3836 uint32_t seq; 3837 int num_req = 0; 3838 int trunc = 0; 3839 struct sctp_tmit_chunk *chk; 3840 struct sctp_chunkhdr *ch; 3841 struct sctp_paramhdr *ph; 3842 int ret_code = 0; 3843 int num_param = 0; 3844 3845 /* now it may be a reset or a reset-response */ 3846 chk_length = ntohs(sr_req->ch.chunk_length); 3847 3848 /* setup for adding the response */ 3849 sctp_alloc_a_chunk(stcb, chk); 3850 if (chk == NULL) { 3851 return (ret_code); 3852 } 3853 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3854 chk->rec.chunk_id.can_take_data = 0; 3855 chk->asoc = &stcb->asoc; 3856 chk->no_fr_allowed = 0; 3857 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3858 chk->book_size_scale = 0; 3859 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3860 if (chk->data == NULL) { 3861 strres_nochunk: 3862 if (chk->data) { 3863 sctp_m_freem(chk->data); 3864 chk->data = NULL; 3865 } 3866 sctp_free_a_chunk(stcb, chk); 3867 return (ret_code); 3868 } 3869 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3870 3871 /* setup chunk parameters */ 3872 chk->sent = SCTP_DATAGRAM_UNSENT; 3873 chk->snd_count = 0; 3874 chk->whoTo = stcb->asoc.primary_destination; 3875 atomic_add_int(&chk->whoTo->ref_count, 1); 3876 3877 ch = mtod(chk->data, struct sctp_chunkhdr *); 3878 ch->chunk_type = SCTP_STREAM_RESET; 3879 ch->chunk_flags = 0; 3880 ch->chunk_length = htons(chk->send_size); 3881 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3882 offset += sizeof(struct sctp_chunkhdr); 3883 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3884 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3885 if (ph == NULL) 3886 break; 3887 param_len = ntohs(ph->param_length); 3888 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3889 /* bad param */ 3890 break; 3891 } 3892 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3893 (uint8_t *) & cstore); 3894 ptype = ntohs(ph->param_type); 3895 num_param++; 3896 if (param_len > (int)sizeof(cstore)) { 3897 trunc = 1; 3898 } else { 3899 trunc = 0; 3900 } 3901 3902 if (num_param > SCTP_MAX_RESET_PARAMS) { 3903 /* hit the max of parameters already sorry.. */ 3904 break; 3905 } 3906 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3907 struct sctp_stream_reset_out_request *req_out; 3908 3909 req_out = (struct sctp_stream_reset_out_request *)ph; 3910 num_req++; 3911 if (stcb->asoc.stream_reset_outstanding) { 3912 seq = ntohl(req_out->response_seq); 3913 if (seq == stcb->asoc.str_reset_seq_out) { 3914 /* implicit ack */ 3915 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3916 } 3917 } 3918 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3919 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3920 struct sctp_stream_reset_add_strm *str_add; 3921 3922 str_add = (struct sctp_stream_reset_add_strm *)ph; 3923 num_req++; 3924 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3925 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3926 struct sctp_stream_reset_in_request *req_in; 3927 3928 num_req++; 3929 3930 req_in = (struct sctp_stream_reset_in_request *)ph; 3931 3932 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3933 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3934 struct sctp_stream_reset_tsn_request *req_tsn; 3935 3936 num_req++; 3937 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3938 3939 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3940 ret_code = 1; 3941 goto strres_nochunk; 3942 } 3943 /* no more */ 3944 break; 3945 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3946 struct sctp_stream_reset_response *resp; 3947 uint32_t result; 3948 3949 resp = (struct sctp_stream_reset_response *)ph; 3950 seq = ntohl(resp->response_seq); 3951 result = ntohl(resp->result); 3952 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3953 ret_code = 1; 3954 goto strres_nochunk; 3955 } 3956 } else { 3957 break; 3958 } 3959 offset += SCTP_SIZE32(param_len); 3960 chk_length -= SCTP_SIZE32(param_len); 3961 } 3962 if (num_req == 0) { 3963 /* we have no response free the stuff */ 3964 goto strres_nochunk; 3965 } 3966 /* ok we have a chunk to link in */ 3967 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3968 chk, 3969 sctp_next); 3970 stcb->asoc.ctrl_queue_cnt++; 3971 return (ret_code); 3972 } 3973 3974 /* 3975 * Handle a router or endpoints report of a packet loss, there are two ways 3976 * to handle this, either we get the whole packet and must disect it 3977 * ourselves (possibly with truncation and or corruption) or it is a summary 3978 * from a middle box that did the disectting for us. 3979 */ 3980 static void 3981 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3982 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3983 { 3984 uint32_t bottle_bw, on_queue; 3985 uint16_t trunc_len; 3986 unsigned int chlen; 3987 unsigned int at; 3988 struct sctp_chunk_desc desc; 3989 struct sctp_chunkhdr *ch; 3990 3991 chlen = ntohs(cp->ch.chunk_length); 3992 chlen -= sizeof(struct sctp_pktdrop_chunk); 3993 /* XXX possible chlen underflow */ 3994 if (chlen == 0) { 3995 ch = NULL; 3996 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3997 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3998 } else { 3999 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4000 chlen -= sizeof(struct sctphdr); 4001 /* XXX possible chlen underflow */ 4002 memset(&desc, 0, sizeof(desc)); 4003 } 4004 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4005 if (trunc_len > limit) { 4006 trunc_len = limit; 4007 } 4008 /* now the chunks themselves */ 4009 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4010 desc.chunk_type = ch->chunk_type; 4011 /* get amount we need to move */ 4012 at = ntohs(ch->chunk_length); 4013 if (at < sizeof(struct sctp_chunkhdr)) { 4014 /* corrupt chunk, maybe at the end? */ 4015 SCTP_STAT_INCR(sctps_pdrpcrupt); 4016 break; 4017 } 4018 if (trunc_len == 0) { 4019 /* we are supposed to have all of it */ 4020 if (at > chlen) { 4021 /* corrupt skip it */ 4022 SCTP_STAT_INCR(sctps_pdrpcrupt); 4023 break; 4024 } 4025 } else { 4026 /* is there enough of it left ? */ 4027 if (desc.chunk_type == SCTP_DATA) { 4028 if (chlen < (sizeof(struct sctp_data_chunk) + 4029 sizeof(desc.data_bytes))) { 4030 break; 4031 } 4032 } else { 4033 if (chlen < sizeof(struct sctp_chunkhdr)) { 4034 break; 4035 } 4036 } 4037 } 4038 if (desc.chunk_type == SCTP_DATA) { 4039 /* can we get out the tsn? */ 4040 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4041 SCTP_STAT_INCR(sctps_pdrpmbda); 4042 4043 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4044 /* yep */ 4045 struct sctp_data_chunk *dcp; 4046 uint8_t *ddp; 4047 unsigned int iii; 4048 4049 dcp = (struct sctp_data_chunk *)ch; 4050 ddp = (uint8_t *) (dcp + 1); 4051 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4052 desc.data_bytes[iii] = ddp[iii]; 4053 } 4054 desc.tsn_ifany = dcp->dp.tsn; 4055 } else { 4056 /* nope we are done. */ 4057 SCTP_STAT_INCR(sctps_pdrpnedat); 4058 break; 4059 } 4060 } else { 4061 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4062 SCTP_STAT_INCR(sctps_pdrpmbct); 4063 } 4064 4065 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4066 SCTP_STAT_INCR(sctps_pdrppdbrk); 4067 break; 4068 } 4069 if (SCTP_SIZE32(at) > chlen) { 4070 break; 4071 } 4072 chlen -= SCTP_SIZE32(at); 4073 if (chlen < sizeof(struct sctp_chunkhdr)) { 4074 /* done, none left */ 4075 break; 4076 } 4077 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4078 } 4079 /* Now update any rwnd --- possibly */ 4080 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4081 /* From a peer, we get a rwnd report */ 4082 uint32_t a_rwnd; 4083 4084 SCTP_STAT_INCR(sctps_pdrpfehos); 4085 4086 bottle_bw = ntohl(cp->bottle_bw); 4087 on_queue = ntohl(cp->current_onq); 4088 if (bottle_bw && on_queue) { 4089 /* a rwnd report is in here */ 4090 if (bottle_bw > on_queue) 4091 a_rwnd = bottle_bw - on_queue; 4092 else 4093 a_rwnd = 0; 4094 4095 if (a_rwnd == 0) 4096 stcb->asoc.peers_rwnd = 0; 4097 else { 4098 if (a_rwnd > stcb->asoc.total_flight) { 4099 stcb->asoc.peers_rwnd = 4100 a_rwnd - stcb->asoc.total_flight; 4101 } else { 4102 stcb->asoc.peers_rwnd = 0; 4103 } 4104 if (stcb->asoc.peers_rwnd < 4105 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4106 /* SWS sender side engages */ 4107 stcb->asoc.peers_rwnd = 0; 4108 } 4109 } 4110 } 4111 } else { 4112 SCTP_STAT_INCR(sctps_pdrpfmbox); 4113 } 4114 4115 /* now middle boxes in sat networks get a cwnd bump */ 4116 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4117 (stcb->asoc.sat_t3_loss_recovery == 0) && 4118 (stcb->asoc.sat_network)) { 4119 /* 4120 * This is debateable but for sat networks it makes sense 4121 * Note if a T3 timer has went off, we will prohibit any 4122 * changes to cwnd until we exit the t3 loss recovery. 4123 */ 4124 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4125 net, cp, &bottle_bw, &on_queue); 4126 } 4127 } 4128 4129 /* 4130 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4131 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4132 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4133 * length of the complete packet outputs: - length: modified to remaining 4134 * length after control processing - netp: modified to new sctp_nets after 4135 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4136 * bad packet,...) otherwise return the tcb for this packet 4137 */ 4138 #ifdef __GNUC__ 4139 __attribute__((noinline)) 4140 #endif 4141 static struct sctp_tcb * 4142 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4143 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4144 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4145 uint32_t vrf_id, uint16_t port) 4146 { 4147 struct sctp_association *asoc; 4148 uint32_t vtag_in; 4149 int num_chunks = 0; /* number of control chunks processed */ 4150 uint32_t chk_length; 4151 int ret; 4152 int abort_no_unlock = 0; 4153 4154 /* 4155 * How big should this be, and should it be alloc'd? Lets try the 4156 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4157 * until we get into jumbo grams and such.. 4158 */ 4159 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4160 struct sctp_tcb *locked_tcb = stcb; 4161 int got_auth = 0; 4162 uint32_t auth_offset = 0, auth_len = 0; 4163 int auth_skipped = 0; 4164 int asconf_cnt = 0; 4165 4166 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4167 struct socket *so; 4168 4169 #endif 4170 4171 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4172 iphlen, *offset, length, stcb); 4173 4174 /* validate chunk header length... */ 4175 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4176 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4177 ntohs(ch->chunk_length)); 4178 if (locked_tcb) { 4179 SCTP_TCB_UNLOCK(locked_tcb); 4180 } 4181 return (NULL); 4182 } 4183 /* 4184 * validate the verification tag 4185 */ 4186 vtag_in = ntohl(sh->v_tag); 4187 4188 if (locked_tcb) { 4189 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4190 } 4191 if (ch->chunk_type == SCTP_INITIATION) { 4192 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4193 ntohs(ch->chunk_length), vtag_in); 4194 if (vtag_in != 0) { 4195 /* protocol error- silently discard... */ 4196 SCTP_STAT_INCR(sctps_badvtag); 4197 if (locked_tcb) { 4198 SCTP_TCB_UNLOCK(locked_tcb); 4199 } 4200 return (NULL); 4201 } 4202 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4203 /* 4204 * If there is no stcb, skip the AUTH chunk and process 4205 * later after a stcb is found (to validate the lookup was 4206 * valid. 4207 */ 4208 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4209 (stcb == NULL) && 4210 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4211 /* save this chunk for later processing */ 4212 auth_skipped = 1; 4213 auth_offset = *offset; 4214 auth_len = ntohs(ch->chunk_length); 4215 4216 /* (temporarily) move past this chunk */ 4217 *offset += SCTP_SIZE32(auth_len); 4218 if (*offset >= length) { 4219 /* no more data left in the mbuf chain */ 4220 *offset = length; 4221 if (locked_tcb) { 4222 SCTP_TCB_UNLOCK(locked_tcb); 4223 } 4224 return (NULL); 4225 } 4226 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4227 sizeof(struct sctp_chunkhdr), chunk_buf); 4228 } 4229 if (ch == NULL) { 4230 /* Help */ 4231 *offset = length; 4232 if (locked_tcb) { 4233 SCTP_TCB_UNLOCK(locked_tcb); 4234 } 4235 return (NULL); 4236 } 4237 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4238 goto process_control_chunks; 4239 } 4240 /* 4241 * first check if it's an ASCONF with an unknown src addr we 4242 * need to look inside to find the association 4243 */ 4244 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4245 struct sctp_chunkhdr *asconf_ch = ch; 4246 uint32_t asconf_offset = 0, asconf_len = 0; 4247 4248 /* inp's refcount may be reduced */ 4249 SCTP_INP_INCR_REF(inp); 4250 4251 asconf_offset = *offset; 4252 do { 4253 asconf_len = ntohs(asconf_ch->chunk_length); 4254 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4255 break; 4256 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4257 *offset, sh, &inp, netp, vrf_id); 4258 if (stcb != NULL) 4259 break; 4260 asconf_offset += SCTP_SIZE32(asconf_len); 4261 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4262 sizeof(struct sctp_chunkhdr), chunk_buf); 4263 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4264 if (stcb == NULL) { 4265 /* 4266 * reduce inp's refcount if not reduced in 4267 * sctp_findassociation_ep_asconf(). 4268 */ 4269 SCTP_INP_DECR_REF(inp); 4270 } else { 4271 locked_tcb = stcb; 4272 } 4273 4274 /* now go back and verify any auth chunk to be sure */ 4275 if (auth_skipped && (stcb != NULL)) { 4276 struct sctp_auth_chunk *auth; 4277 4278 auth = (struct sctp_auth_chunk *) 4279 sctp_m_getptr(m, auth_offset, 4280 auth_len, chunk_buf); 4281 got_auth = 1; 4282 auth_skipped = 0; 4283 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4284 auth_offset)) { 4285 /* auth HMAC failed so dump it */ 4286 *offset = length; 4287 if (locked_tcb) { 4288 SCTP_TCB_UNLOCK(locked_tcb); 4289 } 4290 return (NULL); 4291 } else { 4292 /* remaining chunks are HMAC checked */ 4293 stcb->asoc.authenticated = 1; 4294 } 4295 } 4296 } 4297 if (stcb == NULL) { 4298 /* no association, so it's out of the blue... */ 4299 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4300 vrf_id, port); 4301 *offset = length; 4302 if (locked_tcb) { 4303 SCTP_TCB_UNLOCK(locked_tcb); 4304 } 4305 return (NULL); 4306 } 4307 asoc = &stcb->asoc; 4308 /* ABORT and SHUTDOWN can use either v_tag... */ 4309 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4310 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4311 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4312 if ((vtag_in == asoc->my_vtag) || 4313 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4314 (vtag_in == asoc->peer_vtag))) { 4315 /* this is valid */ 4316 } else { 4317 /* drop this packet... */ 4318 SCTP_STAT_INCR(sctps_badvtag); 4319 if (locked_tcb) { 4320 SCTP_TCB_UNLOCK(locked_tcb); 4321 } 4322 return (NULL); 4323 } 4324 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4325 if (vtag_in != asoc->my_vtag) { 4326 /* 4327 * this could be a stale SHUTDOWN-ACK or the 4328 * peer never got the SHUTDOWN-COMPLETE and 4329 * is still hung; we have started a new asoc 4330 * but it won't complete until the shutdown 4331 * is completed 4332 */ 4333 if (locked_tcb) { 4334 SCTP_TCB_UNLOCK(locked_tcb); 4335 } 4336 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4337 NULL, vrf_id, port); 4338 return (NULL); 4339 } 4340 } else { 4341 /* for all other chunks, vtag must match */ 4342 if (vtag_in != asoc->my_vtag) { 4343 /* invalid vtag... */ 4344 SCTPDBG(SCTP_DEBUG_INPUT3, 4345 "invalid vtag: %xh, expect %xh\n", 4346 vtag_in, asoc->my_vtag); 4347 SCTP_STAT_INCR(sctps_badvtag); 4348 if (locked_tcb) { 4349 SCTP_TCB_UNLOCK(locked_tcb); 4350 } 4351 *offset = length; 4352 return (NULL); 4353 } 4354 } 4355 } /* end if !SCTP_COOKIE_ECHO */ 4356 /* 4357 * process all control chunks... 4358 */ 4359 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4360 /* EY */ 4361 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4362 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4363 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4364 /* implied cookie-ack.. we must have lost the ack */ 4365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4367 stcb->asoc.overall_error_count, 4368 0, 4369 SCTP_FROM_SCTP_INPUT, 4370 __LINE__); 4371 } 4372 stcb->asoc.overall_error_count = 0; 4373 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4374 *netp); 4375 } 4376 process_control_chunks: 4377 while (IS_SCTP_CONTROL(ch)) { 4378 /* validate chunk length */ 4379 chk_length = ntohs(ch->chunk_length); 4380 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4381 ch->chunk_type, chk_length); 4382 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4383 if (chk_length < sizeof(*ch) || 4384 (*offset + (int)chk_length) > length) { 4385 *offset = length; 4386 if (locked_tcb) { 4387 SCTP_TCB_UNLOCK(locked_tcb); 4388 } 4389 return (NULL); 4390 } 4391 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4392 /* 4393 * INIT-ACK only gets the init ack "header" portion only 4394 * because we don't have to process the peer's COOKIE. All 4395 * others get a complete chunk. 4396 */ 4397 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4398 (ch->chunk_type == SCTP_INITIATION)) { 4399 /* get an init-ack chunk */ 4400 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4401 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4402 if (ch == NULL) { 4403 *offset = length; 4404 if (locked_tcb) { 4405 SCTP_TCB_UNLOCK(locked_tcb); 4406 } 4407 return (NULL); 4408 } 4409 } else { 4410 /* For cookies and all other chunks. */ 4411 if (chk_length > sizeof(chunk_buf)) { 4412 /* 4413 * use just the size of the chunk buffer so 4414 * the front part of our chunks fit in 4415 * contiguous space up to the chunk buffer 4416 * size (508 bytes). For chunks that need to 4417 * get more than that they must use the 4418 * sctp_m_getptr() function or other means 4419 * (e.g. know how to parse mbuf chains). 4420 * Cookies do this already. 4421 */ 4422 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4423 (sizeof(chunk_buf) - 4), 4424 chunk_buf); 4425 if (ch == NULL) { 4426 *offset = length; 4427 if (locked_tcb) { 4428 SCTP_TCB_UNLOCK(locked_tcb); 4429 } 4430 return (NULL); 4431 } 4432 } else { 4433 /* We can fit it all */ 4434 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4435 chk_length, chunk_buf); 4436 if (ch == NULL) { 4437 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4438 *offset = length; 4439 if (locked_tcb) { 4440 SCTP_TCB_UNLOCK(locked_tcb); 4441 } 4442 return (NULL); 4443 } 4444 } 4445 } 4446 num_chunks++; 4447 /* Save off the last place we got a control from */ 4448 if (stcb != NULL) { 4449 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4450 /* 4451 * allow last_control to be NULL if 4452 * ASCONF... ASCONF processing will find the 4453 * right net later 4454 */ 4455 if ((netp != NULL) && (*netp != NULL)) 4456 stcb->asoc.last_control_chunk_from = *netp; 4457 } 4458 } 4459 #ifdef SCTP_AUDITING_ENABLED 4460 sctp_audit_log(0xB0, ch->chunk_type); 4461 #endif 4462 4463 /* check to see if this chunk required auth, but isn't */ 4464 if ((stcb != NULL) && 4465 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4466 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4467 !stcb->asoc.authenticated) { 4468 /* "silently" ignore */ 4469 SCTP_STAT_INCR(sctps_recvauthmissing); 4470 goto next_chunk; 4471 } 4472 switch (ch->chunk_type) { 4473 case SCTP_INITIATION: 4474 /* must be first and only chunk */ 4475 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4476 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4477 /* We are not interested anymore? */ 4478 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4479 /* 4480 * collision case where we are 4481 * sending to them too 4482 */ 4483 ; 4484 } else { 4485 if (locked_tcb) { 4486 SCTP_TCB_UNLOCK(locked_tcb); 4487 } 4488 *offset = length; 4489 return (NULL); 4490 } 4491 } 4492 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4493 (num_chunks > 1) || 4494 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4495 *offset = length; 4496 if (locked_tcb) { 4497 SCTP_TCB_UNLOCK(locked_tcb); 4498 } 4499 return (NULL); 4500 } 4501 if ((stcb != NULL) && 4502 (SCTP_GET_STATE(&stcb->asoc) == 4503 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4504 sctp_send_shutdown_ack(stcb, 4505 stcb->asoc.primary_destination); 4506 *offset = length; 4507 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4508 if (locked_tcb) { 4509 SCTP_TCB_UNLOCK(locked_tcb); 4510 } 4511 return (NULL); 4512 } 4513 if (netp) { 4514 sctp_handle_init(m, iphlen, *offset, sh, 4515 (struct sctp_init_chunk *)ch, inp, 4516 stcb, *netp, &abort_no_unlock, vrf_id, port); 4517 } 4518 if (abort_no_unlock) 4519 return (NULL); 4520 4521 *offset = length; 4522 if (locked_tcb) { 4523 SCTP_TCB_UNLOCK(locked_tcb); 4524 } 4525 return (NULL); 4526 break; 4527 case SCTP_PAD_CHUNK: 4528 break; 4529 case SCTP_INITIATION_ACK: 4530 /* must be first and only chunk */ 4531 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4532 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4533 /* We are not interested anymore */ 4534 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4535 ; 4536 } else { 4537 if (locked_tcb != stcb) { 4538 /* Very unlikely */ 4539 SCTP_TCB_UNLOCK(locked_tcb); 4540 } 4541 *offset = length; 4542 if (stcb) { 4543 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4544 so = SCTP_INP_SO(inp); 4545 atomic_add_int(&stcb->asoc.refcnt, 1); 4546 SCTP_TCB_UNLOCK(stcb); 4547 SCTP_SOCKET_LOCK(so, 1); 4548 SCTP_TCB_LOCK(stcb); 4549 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4550 #endif 4551 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4552 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4553 SCTP_SOCKET_UNLOCK(so, 1); 4554 #endif 4555 } 4556 return (NULL); 4557 } 4558 } 4559 if ((num_chunks > 1) || 4560 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4561 *offset = length; 4562 if (locked_tcb) { 4563 SCTP_TCB_UNLOCK(locked_tcb); 4564 } 4565 return (NULL); 4566 } 4567 if ((netp) && (*netp)) { 4568 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4569 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4570 } else { 4571 ret = -1; 4572 } 4573 /* 4574 * Special case, I must call the output routine to 4575 * get the cookie echoed 4576 */ 4577 if (abort_no_unlock) 4578 return (NULL); 4579 4580 if ((stcb) && ret == 0) 4581 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4582 *offset = length; 4583 if (locked_tcb) { 4584 SCTP_TCB_UNLOCK(locked_tcb); 4585 } 4586 return (NULL); 4587 break; 4588 case SCTP_SELECTIVE_ACK: 4589 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4590 SCTP_STAT_INCR(sctps_recvsacks); 4591 { 4592 struct sctp_sack_chunk *sack; 4593 int abort_now = 0; 4594 uint32_t a_rwnd, cum_ack; 4595 uint16_t num_seg, num_dup; 4596 uint8_t flags; 4597 int offset_seg, offset_dup; 4598 int nonce_sum_flag; 4599 4600 if (stcb == NULL) { 4601 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4602 break; 4603 } 4604 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4605 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4606 break; 4607 } 4608 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4609 /*- 4610 * If we have sent a shutdown-ack, we will pay no 4611 * attention to a sack sent in to us since 4612 * we don't care anymore. 4613 */ 4614 break; 4615 } 4616 sack = (struct sctp_sack_chunk *)ch; 4617 flags = ch->chunk_flags; 4618 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4619 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4620 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4621 num_dup = ntohs(sack->sack.num_dup_tsns); 4622 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4623 if (sizeof(struct sctp_sack_chunk) + 4624 num_seg * sizeof(struct sctp_gap_ack_block) + 4625 num_dup * sizeof(uint32_t) != chk_length) { 4626 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4627 break; 4628 } 4629 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4630 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4631 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4632 cum_ack, num_seg, a_rwnd); 4633 stcb->asoc.seen_a_sack_this_pkt = 1; 4634 if ((stcb->asoc.pr_sctp_cnt == 0) && 4635 (num_seg == 0) && 4636 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4637 (cum_ack == stcb->asoc.last_acked_seq)) && 4638 (stcb->asoc.saw_sack_with_frags == 0) && 4639 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4640 ) { 4641 /* 4642 * We have a SIMPLE sack having no 4643 * prior segments and data on sent 4644 * queue to be acked.. Use the 4645 * faster path sack processing. We 4646 * also allow window update sacks 4647 * with no missing segments to go 4648 * this way too. 4649 */ 4650 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4651 &abort_now); 4652 } else { 4653 if (netp && *netp) 4654 sctp_handle_sack(m, offset_seg, offset_dup, 4655 stcb, *netp, 4656 num_seg, 0, num_dup, &abort_now, flags, 4657 cum_ack, a_rwnd); 4658 } 4659 if (abort_now) { 4660 /* ABORT signal from sack processing */ 4661 *offset = length; 4662 return (NULL); 4663 } 4664 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4665 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4666 (stcb->asoc.stream_queue_cnt == 0)) { 4667 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4668 } 4669 } 4670 break; 4671 /* 4672 * EY - nr_sack: If the received chunk is an 4673 * nr_sack chunk 4674 */ 4675 case SCTP_NR_SELECTIVE_ACK: 4676 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4677 SCTP_STAT_INCR(sctps_recvsacks); 4678 { 4679 struct sctp_nr_sack_chunk *nr_sack; 4680 int abort_now = 0; 4681 uint32_t a_rwnd, cum_ack; 4682 uint16_t num_seg, num_nr_seg, num_dup; 4683 uint8_t flags; 4684 int offset_seg, offset_dup; 4685 int nonce_sum_flag; 4686 4687 /* 4688 * EY nr_sacks have not been negotiated but 4689 * the peer end sent an nr_sack, silently 4690 * discard the chunk 4691 */ 4692 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && 4693 stcb->asoc.peer_supports_nr_sack)) { 4694 goto unknown_chunk; 4695 } 4696 if (stcb == NULL) { 4697 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4698 break; 4699 } 4700 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4701 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4702 break; 4703 } 4704 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4705 /*- 4706 * If we have sent a shutdown-ack, we will pay no 4707 * attention to a sack sent in to us since 4708 * we don't care anymore. 4709 */ 4710 break; 4711 } 4712 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4713 flags = ch->chunk_flags; 4714 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4715 4716 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4717 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4718 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4719 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4720 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4721 if (sizeof(struct sctp_nr_sack_chunk) + 4722 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4723 num_dup * sizeof(uint32_t) != chk_length) { 4724 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4725 break; 4726 } 4727 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4728 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4729 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4730 cum_ack, num_seg, a_rwnd); 4731 stcb->asoc.seen_a_sack_this_pkt = 1; 4732 if ((stcb->asoc.pr_sctp_cnt == 0) && 4733 (num_seg == 0) && (num_nr_seg == 0) && 4734 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4735 (cum_ack == stcb->asoc.last_acked_seq)) && 4736 (stcb->asoc.saw_sack_with_frags == 0) && 4737 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4738 /* 4739 * We have a SIMPLE sack having no 4740 * prior segments and data on sent 4741 * queue to be acked. Use the faster 4742 * path sack processing. We also 4743 * allow window update sacks with no 4744 * missing segments to go this way 4745 * too. 4746 */ 4747 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4748 &abort_now); 4749 } else { 4750 if (netp && *netp) 4751 sctp_handle_sack(m, offset_seg, offset_dup, 4752 stcb, *netp, 4753 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4754 cum_ack, a_rwnd); 4755 } 4756 if (abort_now) { 4757 /* ABORT signal from sack processing */ 4758 *offset = length; 4759 return (NULL); 4760 } 4761 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4762 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4763 (stcb->asoc.stream_queue_cnt == 0)) { 4764 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4765 } 4766 } 4767 break; 4768 4769 case SCTP_HEARTBEAT_REQUEST: 4770 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4771 if ((stcb) && netp && *netp) { 4772 SCTP_STAT_INCR(sctps_recvheartbeat); 4773 sctp_send_heartbeat_ack(stcb, m, *offset, 4774 chk_length, *netp); 4775 4776 /* He's alive so give him credit */ 4777 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4778 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4779 stcb->asoc.overall_error_count, 4780 0, 4781 SCTP_FROM_SCTP_INPUT, 4782 __LINE__); 4783 } 4784 stcb->asoc.overall_error_count = 0; 4785 } 4786 break; 4787 case SCTP_HEARTBEAT_ACK: 4788 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4789 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4790 /* Its not ours */ 4791 *offset = length; 4792 if (locked_tcb) { 4793 SCTP_TCB_UNLOCK(locked_tcb); 4794 } 4795 return (NULL); 4796 } 4797 /* He's alive so give him credit */ 4798 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4799 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4800 stcb->asoc.overall_error_count, 4801 0, 4802 SCTP_FROM_SCTP_INPUT, 4803 __LINE__); 4804 } 4805 stcb->asoc.overall_error_count = 0; 4806 SCTP_STAT_INCR(sctps_recvheartbeatack); 4807 if (netp && *netp) 4808 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4809 stcb, *netp); 4810 break; 4811 case SCTP_ABORT_ASSOCIATION: 4812 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4813 stcb); 4814 if ((stcb) && netp && *netp) 4815 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4816 stcb, *netp); 4817 *offset = length; 4818 return (NULL); 4819 break; 4820 case SCTP_SHUTDOWN: 4821 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4822 stcb); 4823 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4824 *offset = length; 4825 if (locked_tcb) { 4826 SCTP_TCB_UNLOCK(locked_tcb); 4827 } 4828 return (NULL); 4829 } 4830 if (netp && *netp) { 4831 int abort_flag = 0; 4832 4833 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4834 stcb, *netp, &abort_flag); 4835 if (abort_flag) { 4836 *offset = length; 4837 return (NULL); 4838 } 4839 } 4840 break; 4841 case SCTP_SHUTDOWN_ACK: 4842 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4843 if ((stcb) && (netp) && (*netp)) 4844 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4845 *offset = length; 4846 return (NULL); 4847 break; 4848 4849 case SCTP_OPERATION_ERROR: 4850 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4851 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4852 4853 *offset = length; 4854 return (NULL); 4855 } 4856 break; 4857 case SCTP_COOKIE_ECHO: 4858 SCTPDBG(SCTP_DEBUG_INPUT3, 4859 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4860 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4861 ; 4862 } else { 4863 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4864 /* We are not interested anymore */ 4865 abend: 4866 if (stcb) { 4867 SCTP_TCB_UNLOCK(stcb); 4868 } 4869 *offset = length; 4870 return (NULL); 4871 } 4872 } 4873 /* 4874 * First are we accepting? We do this again here 4875 * since it is possible that a previous endpoint WAS 4876 * listening responded to a INIT-ACK and then 4877 * closed. We opened and bound.. and are now no 4878 * longer listening. 4879 */ 4880 4881 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4882 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4883 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4884 struct mbuf *oper; 4885 struct sctp_paramhdr *phdr; 4886 4887 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4888 0, M_DONTWAIT, 1, MT_DATA); 4889 if (oper) { 4890 SCTP_BUF_LEN(oper) = 4891 sizeof(struct sctp_paramhdr); 4892 phdr = mtod(oper, 4893 struct sctp_paramhdr *); 4894 phdr->param_type = 4895 htons(SCTP_CAUSE_OUT_OF_RESC); 4896 phdr->param_length = 4897 htons(sizeof(struct sctp_paramhdr)); 4898 } 4899 sctp_abort_association(inp, stcb, m, 4900 iphlen, sh, oper, vrf_id, port); 4901 } 4902 *offset = length; 4903 return (NULL); 4904 } else { 4905 struct mbuf *ret_buf; 4906 struct sctp_inpcb *linp; 4907 4908 if (stcb) { 4909 linp = NULL; 4910 } else { 4911 linp = inp; 4912 } 4913 4914 if (linp) { 4915 SCTP_ASOC_CREATE_LOCK(linp); 4916 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4917 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4918 SCTP_ASOC_CREATE_UNLOCK(linp); 4919 goto abend; 4920 } 4921 } 4922 if (netp) { 4923 ret_buf = 4924 sctp_handle_cookie_echo(m, iphlen, 4925 *offset, sh, 4926 (struct sctp_cookie_echo_chunk *)ch, 4927 &inp, &stcb, netp, 4928 auth_skipped, 4929 auth_offset, 4930 auth_len, 4931 &locked_tcb, 4932 vrf_id, 4933 port); 4934 } else { 4935 ret_buf = NULL; 4936 } 4937 if (linp) { 4938 SCTP_ASOC_CREATE_UNLOCK(linp); 4939 } 4940 if (ret_buf == NULL) { 4941 if (locked_tcb) { 4942 SCTP_TCB_UNLOCK(locked_tcb); 4943 } 4944 SCTPDBG(SCTP_DEBUG_INPUT3, 4945 "GAK, null buffer\n"); 4946 auth_skipped = 0; 4947 *offset = length; 4948 return (NULL); 4949 } 4950 /* if AUTH skipped, see if it verified... */ 4951 if (auth_skipped) { 4952 got_auth = 1; 4953 auth_skipped = 0; 4954 } 4955 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4956 /* 4957 * Restart the timer if we have 4958 * pending data 4959 */ 4960 struct sctp_tmit_chunk *chk; 4961 4962 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4963 if (chk) { 4964 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4965 stcb->sctp_ep, stcb, 4966 chk->whoTo); 4967 } 4968 } 4969 } 4970 break; 4971 case SCTP_COOKIE_ACK: 4972 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4973 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4974 if (locked_tcb) { 4975 SCTP_TCB_UNLOCK(locked_tcb); 4976 } 4977 return (NULL); 4978 } 4979 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4980 /* We are not interested anymore */ 4981 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4982 ; 4983 } else if (stcb) { 4984 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4985 so = SCTP_INP_SO(inp); 4986 atomic_add_int(&stcb->asoc.refcnt, 1); 4987 SCTP_TCB_UNLOCK(stcb); 4988 SCTP_SOCKET_LOCK(so, 1); 4989 SCTP_TCB_LOCK(stcb); 4990 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4991 #endif 4992 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4993 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4994 SCTP_SOCKET_UNLOCK(so, 1); 4995 #endif 4996 *offset = length; 4997 return (NULL); 4998 } 4999 } 5000 /* He's alive so give him credit */ 5001 if ((stcb) && netp && *netp) { 5002 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5003 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5004 stcb->asoc.overall_error_count, 5005 0, 5006 SCTP_FROM_SCTP_INPUT, 5007 __LINE__); 5008 } 5009 stcb->asoc.overall_error_count = 0; 5010 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5011 } 5012 break; 5013 case SCTP_ECN_ECHO: 5014 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5015 /* He's alive so give him credit */ 5016 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5017 /* Its not ours */ 5018 if (locked_tcb) { 5019 SCTP_TCB_UNLOCK(locked_tcb); 5020 } 5021 *offset = length; 5022 return (NULL); 5023 } 5024 if (stcb) { 5025 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5026 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5027 stcb->asoc.overall_error_count, 5028 0, 5029 SCTP_FROM_SCTP_INPUT, 5030 __LINE__); 5031 } 5032 stcb->asoc.overall_error_count = 0; 5033 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5034 stcb); 5035 } 5036 break; 5037 case SCTP_ECN_CWR: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5039 /* He's alive so give him credit */ 5040 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5041 /* Its not ours */ 5042 if (locked_tcb) { 5043 SCTP_TCB_UNLOCK(locked_tcb); 5044 } 5045 *offset = length; 5046 return (NULL); 5047 } 5048 if (stcb) { 5049 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5050 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5051 stcb->asoc.overall_error_count, 5052 0, 5053 SCTP_FROM_SCTP_INPUT, 5054 __LINE__); 5055 } 5056 stcb->asoc.overall_error_count = 0; 5057 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5058 } 5059 break; 5060 case SCTP_SHUTDOWN_COMPLETE: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5062 /* must be first and only chunk */ 5063 if ((num_chunks > 1) || 5064 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5065 *offset = length; 5066 if (locked_tcb) { 5067 SCTP_TCB_UNLOCK(locked_tcb); 5068 } 5069 return (NULL); 5070 } 5071 if ((stcb) && netp && *netp) { 5072 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5073 stcb, *netp); 5074 } 5075 *offset = length; 5076 return (NULL); 5077 break; 5078 case SCTP_ASCONF: 5079 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5080 /* He's alive so give him credit */ 5081 if (stcb) { 5082 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5083 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5084 stcb->asoc.overall_error_count, 5085 0, 5086 SCTP_FROM_SCTP_INPUT, 5087 __LINE__); 5088 } 5089 stcb->asoc.overall_error_count = 0; 5090 sctp_handle_asconf(m, *offset, 5091 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5092 asconf_cnt++; 5093 } 5094 break; 5095 case SCTP_ASCONF_ACK: 5096 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5097 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5098 /* Its not ours */ 5099 if (locked_tcb) { 5100 SCTP_TCB_UNLOCK(locked_tcb); 5101 } 5102 *offset = length; 5103 return (NULL); 5104 } 5105 if ((stcb) && netp && *netp) { 5106 /* He's alive so give him credit */ 5107 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5108 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5109 stcb->asoc.overall_error_count, 5110 0, 5111 SCTP_FROM_SCTP_INPUT, 5112 __LINE__); 5113 } 5114 stcb->asoc.overall_error_count = 0; 5115 sctp_handle_asconf_ack(m, *offset, 5116 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5117 if (abort_no_unlock) 5118 return (NULL); 5119 } 5120 break; 5121 case SCTP_FORWARD_CUM_TSN: 5122 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5123 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5124 /* Its not ours */ 5125 if (locked_tcb) { 5126 SCTP_TCB_UNLOCK(locked_tcb); 5127 } 5128 *offset = length; 5129 return (NULL); 5130 } 5131 /* He's alive so give him credit */ 5132 if (stcb) { 5133 int abort_flag = 0; 5134 5135 stcb->asoc.overall_error_count = 0; 5136 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5137 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5138 stcb->asoc.overall_error_count, 5139 0, 5140 SCTP_FROM_SCTP_INPUT, 5141 __LINE__); 5142 } 5143 *fwd_tsn_seen = 1; 5144 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5145 /* We are not interested anymore */ 5146 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5147 so = SCTP_INP_SO(inp); 5148 atomic_add_int(&stcb->asoc.refcnt, 1); 5149 SCTP_TCB_UNLOCK(stcb); 5150 SCTP_SOCKET_LOCK(so, 1); 5151 SCTP_TCB_LOCK(stcb); 5152 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5153 #endif 5154 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5155 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5156 SCTP_SOCKET_UNLOCK(so, 1); 5157 #endif 5158 *offset = length; 5159 return (NULL); 5160 } 5161 sctp_handle_forward_tsn(stcb, 5162 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5163 if (abort_flag) { 5164 *offset = length; 5165 return (NULL); 5166 } else { 5167 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5168 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5169 stcb->asoc.overall_error_count, 5170 0, 5171 SCTP_FROM_SCTP_INPUT, 5172 __LINE__); 5173 } 5174 stcb->asoc.overall_error_count = 0; 5175 } 5176 5177 } 5178 break; 5179 case SCTP_STREAM_RESET: 5180 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5181 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5182 /* Its not ours */ 5183 if (locked_tcb) { 5184 SCTP_TCB_UNLOCK(locked_tcb); 5185 } 5186 *offset = length; 5187 return (NULL); 5188 } 5189 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5190 /* We are not interested anymore */ 5191 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5192 so = SCTP_INP_SO(inp); 5193 atomic_add_int(&stcb->asoc.refcnt, 1); 5194 SCTP_TCB_UNLOCK(stcb); 5195 SCTP_SOCKET_LOCK(so, 1); 5196 SCTP_TCB_LOCK(stcb); 5197 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5198 #endif 5199 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5200 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5201 SCTP_SOCKET_UNLOCK(so, 1); 5202 #endif 5203 *offset = length; 5204 return (NULL); 5205 } 5206 if (stcb->asoc.peer_supports_strreset == 0) { 5207 /* 5208 * hmm, peer should have announced this, but 5209 * we will turn it on since he is sending us 5210 * a stream reset. 5211 */ 5212 stcb->asoc.peer_supports_strreset = 1; 5213 } 5214 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5215 /* stop processing */ 5216 *offset = length; 5217 return (NULL); 5218 } 5219 break; 5220 case SCTP_PACKET_DROPPED: 5221 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5222 /* re-get it all please */ 5223 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5224 /* Its not ours */ 5225 if (locked_tcb) { 5226 SCTP_TCB_UNLOCK(locked_tcb); 5227 } 5228 *offset = length; 5229 return (NULL); 5230 } 5231 if (ch && (stcb) && netp && (*netp)) { 5232 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5233 stcb, *netp, 5234 min(chk_length, (sizeof(chunk_buf) - 4))); 5235 5236 } 5237 break; 5238 5239 case SCTP_AUTHENTICATION: 5240 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5241 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5242 goto unknown_chunk; 5243 5244 if (stcb == NULL) { 5245 /* save the first AUTH for later processing */ 5246 if (auth_skipped == 0) { 5247 auth_offset = *offset; 5248 auth_len = chk_length; 5249 auth_skipped = 1; 5250 } 5251 /* skip this chunk (temporarily) */ 5252 goto next_chunk; 5253 } 5254 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5255 (chk_length > (sizeof(struct sctp_auth_chunk) + 5256 SCTP_AUTH_DIGEST_LEN_MAX))) { 5257 /* Its not ours */ 5258 if (locked_tcb) { 5259 SCTP_TCB_UNLOCK(locked_tcb); 5260 } 5261 *offset = length; 5262 return (NULL); 5263 } 5264 if (got_auth == 1) { 5265 /* skip this chunk... it's already auth'd */ 5266 goto next_chunk; 5267 } 5268 got_auth = 1; 5269 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5270 m, *offset)) { 5271 /* auth HMAC failed so dump the packet */ 5272 *offset = length; 5273 return (stcb); 5274 } else { 5275 /* remaining chunks are HMAC checked */ 5276 stcb->asoc.authenticated = 1; 5277 } 5278 break; 5279 5280 default: 5281 unknown_chunk: 5282 /* it's an unknown chunk! */ 5283 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5284 struct mbuf *mm; 5285 struct sctp_paramhdr *phd; 5286 5287 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5288 0, M_DONTWAIT, 1, MT_DATA); 5289 if (mm) { 5290 phd = mtod(mm, struct sctp_paramhdr *); 5291 /* 5292 * We cheat and use param type since 5293 * we did not bother to define a 5294 * error cause struct. They are the 5295 * same basic format with different 5296 * names. 5297 */ 5298 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5299 phd->param_length = htons(chk_length + sizeof(*phd)); 5300 SCTP_BUF_LEN(mm) = sizeof(*phd); 5301 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5302 M_DONTWAIT); 5303 if (SCTP_BUF_NEXT(mm)) { 5304 #ifdef SCTP_MBUF_LOGGING 5305 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5306 struct mbuf *mat; 5307 5308 mat = SCTP_BUF_NEXT(mm); 5309 while (mat) { 5310 if (SCTP_BUF_IS_EXTENDED(mat)) { 5311 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5312 } 5313 mat = SCTP_BUF_NEXT(mat); 5314 } 5315 } 5316 #endif 5317 sctp_queue_op_err(stcb, mm); 5318 } else { 5319 sctp_m_freem(mm); 5320 } 5321 } 5322 } 5323 if ((ch->chunk_type & 0x80) == 0) { 5324 /* discard this packet */ 5325 *offset = length; 5326 return (stcb); 5327 } /* else skip this bad chunk and continue... */ 5328 break; 5329 } /* switch (ch->chunk_type) */ 5330 5331 5332 next_chunk: 5333 /* get the next chunk */ 5334 *offset += SCTP_SIZE32(chk_length); 5335 if (*offset >= length) { 5336 /* no more data left in the mbuf chain */ 5337 break; 5338 } 5339 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5340 sizeof(struct sctp_chunkhdr), chunk_buf); 5341 if (ch == NULL) { 5342 if (locked_tcb) { 5343 SCTP_TCB_UNLOCK(locked_tcb); 5344 } 5345 *offset = length; 5346 return (NULL); 5347 } 5348 } /* while */ 5349 5350 if (asconf_cnt > 0 && stcb != NULL) { 5351 sctp_send_asconf_ack(stcb); 5352 } 5353 return (stcb); 5354 } 5355 5356 5357 /* 5358 * Process the ECN bits we have something set so we must look to see if it is 5359 * ECN(0) or ECN(1) or CE 5360 */ 5361 static void 5362 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5363 uint8_t ecn_bits) 5364 { 5365 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5366 ; 5367 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5368 /* 5369 * we only add to the nonce sum for ECT1, ECT0 does not 5370 * change the NS bit (that we have yet to find a way to send 5371 * it yet). 5372 */ 5373 5374 /* ECN Nonce stuff */ 5375 stcb->asoc.receiver_nonce_sum++; 5376 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5377 5378 /* 5379 * Drag up the last_echo point if cumack is larger since we 5380 * don't want the point falling way behind by more than 5381 * 2^^31 and then having it be incorrect. 5382 */ 5383 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5384 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5385 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5386 } 5387 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5388 /* 5389 * Drag up the last_echo point if cumack is larger since we 5390 * don't want the point falling way behind by more than 5391 * 2^^31 and then having it be incorrect. 5392 */ 5393 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5394 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5395 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5396 } 5397 } 5398 } 5399 5400 static void 5401 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5402 uint32_t high_tsn, uint8_t ecn_bits) 5403 { 5404 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5405 /* 5406 * we possibly must notify the sender that a congestion 5407 * window reduction is in order. We do this by adding a ECNE 5408 * chunk to the output chunk queue. The incoming CWR will 5409 * remove this chunk. 5410 */ 5411 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5412 MAX_TSN)) { 5413 /* Yep, we need to add a ECNE */ 5414 sctp_send_ecn_echo(stcb, net, high_tsn); 5415 stcb->asoc.last_echo_tsn = high_tsn; 5416 } 5417 } 5418 } 5419 5420 #ifdef INVARIANTS 5421 #ifdef __GNUC__ 5422 __attribute__((noinline)) 5423 #endif 5424 void 5425 sctp_validate_no_locks(struct sctp_inpcb *inp) 5426 { 5427 struct sctp_tcb *lstcb; 5428 5429 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5430 if (mtx_owned(&lstcb->tcb_mtx)) { 5431 panic("Own lock on stcb at return from input"); 5432 } 5433 } 5434 if (mtx_owned(&inp->inp_create_mtx)) { 5435 panic("Own create lock on inp"); 5436 } 5437 if (mtx_owned(&inp->inp_mtx)) { 5438 panic("Own inp lock on inp"); 5439 } 5440 } 5441 5442 #endif 5443 5444 /* 5445 * common input chunk processing (v4 and v6) 5446 */ 5447 void 5448 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5449 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5450 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5451 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5452 { 5453 /* 5454 * Control chunk processing 5455 */ 5456 uint32_t high_tsn; 5457 int fwd_tsn_seen = 0, data_processed = 0; 5458 struct mbuf *m = *mm; 5459 int abort_flag = 0; 5460 int un_sent; 5461 5462 SCTP_STAT_INCR(sctps_recvdatagrams); 5463 #ifdef SCTP_AUDITING_ENABLED 5464 sctp_audit_log(0xE0, 1); 5465 sctp_auditing(0, inp, stcb, net); 5466 #endif 5467 5468 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5469 m, iphlen, offset, length, stcb); 5470 if (stcb) { 5471 /* always clear this before beginning a packet */ 5472 stcb->asoc.authenticated = 0; 5473 stcb->asoc.seen_a_sack_this_pkt = 0; 5474 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5475 stcb, stcb->asoc.state); 5476 5477 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5478 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5479 /*- 5480 * If we hit here, we had a ref count 5481 * up when the assoc was aborted and the 5482 * timer is clearing out the assoc, we should 5483 * NOT respond to any packet.. its OOTB. 5484 */ 5485 SCTP_TCB_UNLOCK(stcb); 5486 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5487 vrf_id, port); 5488 goto out_now; 5489 } 5490 } 5491 if (IS_SCTP_CONTROL(ch)) { 5492 /* process the control portion of the SCTP packet */ 5493 /* sa_ignore NO_NULL_CHK */ 5494 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5495 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5496 if (stcb) { 5497 /* 5498 * This covers us if the cookie-echo was there and 5499 * it changes our INP. 5500 */ 5501 inp = stcb->sctp_ep; 5502 if ((net) && (port)) { 5503 if (net->port == 0) { 5504 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5505 } 5506 net->port = port; 5507 } 5508 } 5509 } else { 5510 /* 5511 * no control chunks, so pre-process DATA chunks (these 5512 * checks are taken care of by control processing) 5513 */ 5514 5515 /* 5516 * if DATA only packet, and auth is required, then punt... 5517 * can't have authenticated without any AUTH (control) 5518 * chunks 5519 */ 5520 if ((stcb != NULL) && 5521 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5522 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5523 /* "silently" ignore */ 5524 SCTP_STAT_INCR(sctps_recvauthmissing); 5525 SCTP_TCB_UNLOCK(stcb); 5526 goto out_now; 5527 } 5528 if (stcb == NULL) { 5529 /* out of the blue DATA chunk */ 5530 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5531 vrf_id, port); 5532 goto out_now; 5533 } 5534 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5535 /* v_tag mismatch! */ 5536 SCTP_STAT_INCR(sctps_badvtag); 5537 SCTP_TCB_UNLOCK(stcb); 5538 goto out_now; 5539 } 5540 } 5541 5542 if (stcb == NULL) { 5543 /* 5544 * no valid TCB for this packet, or we found it's a bad 5545 * packet while processing control, or we're done with this 5546 * packet (done or skip rest of data), so we drop it... 5547 */ 5548 goto out_now; 5549 } 5550 /* 5551 * DATA chunk processing 5552 */ 5553 /* plow through the data chunks while length > offset */ 5554 5555 /* 5556 * Rest should be DATA only. Check authentication state if AUTH for 5557 * DATA is required. 5558 */ 5559 if ((length > offset) && 5560 (stcb != NULL) && 5561 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5562 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5563 !stcb->asoc.authenticated) { 5564 /* "silently" ignore */ 5565 SCTP_STAT_INCR(sctps_recvauthmissing); 5566 SCTPDBG(SCTP_DEBUG_AUTH1, 5567 "Data chunk requires AUTH, skipped\n"); 5568 goto trigger_send; 5569 } 5570 if (length > offset) { 5571 int retval; 5572 5573 /* 5574 * First check to make sure our state is correct. We would 5575 * not get here unless we really did have a tag, so we don't 5576 * abort if this happens, just dump the chunk silently. 5577 */ 5578 switch (SCTP_GET_STATE(&stcb->asoc)) { 5579 case SCTP_STATE_COOKIE_ECHOED: 5580 /* 5581 * we consider data with valid tags in this state 5582 * shows us the cookie-ack was lost. Imply it was 5583 * there. 5584 */ 5585 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5586 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5587 stcb->asoc.overall_error_count, 5588 0, 5589 SCTP_FROM_SCTP_INPUT, 5590 __LINE__); 5591 } 5592 stcb->asoc.overall_error_count = 0; 5593 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5594 break; 5595 case SCTP_STATE_COOKIE_WAIT: 5596 /* 5597 * We consider OOTB any data sent during asoc setup. 5598 */ 5599 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5600 vrf_id, port); 5601 SCTP_TCB_UNLOCK(stcb); 5602 goto out_now; 5603 /* sa_ignore NOTREACHED */ 5604 break; 5605 case SCTP_STATE_EMPTY: /* should not happen */ 5606 case SCTP_STATE_INUSE: /* should not happen */ 5607 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5608 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5609 default: 5610 SCTP_TCB_UNLOCK(stcb); 5611 goto out_now; 5612 /* sa_ignore NOTREACHED */ 5613 break; 5614 case SCTP_STATE_OPEN: 5615 case SCTP_STATE_SHUTDOWN_SENT: 5616 break; 5617 } 5618 /* take care of ECN, part 1. */ 5619 if (stcb->asoc.ecn_allowed && 5620 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5621 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5622 } 5623 /* plow through the data chunks while length > offset */ 5624 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5625 inp, stcb, net, &high_tsn); 5626 if (retval == 2) { 5627 /* 5628 * The association aborted, NO UNLOCK needed since 5629 * the association is destroyed. 5630 */ 5631 goto out_now; 5632 } 5633 data_processed = 1; 5634 if (retval == 0) { 5635 /* take care of ecn part 2. */ 5636 if (stcb->asoc.ecn_allowed && 5637 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5638 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5639 ecn_bits); 5640 } 5641 } 5642 /* 5643 * Anything important needs to have been m_copy'ed in 5644 * process_data 5645 */ 5646 } 5647 if ((data_processed == 0) && (fwd_tsn_seen)) { 5648 int was_a_gap = 0; 5649 5650 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5651 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5652 /* there was a gap before this data was processed */ 5653 was_a_gap = 1; 5654 } 5655 stcb->asoc.send_sack = 1; 5656 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5657 if (abort_flag) { 5658 /* Again, we aborted so NO UNLOCK needed */ 5659 goto out_now; 5660 } 5661 } else if (fwd_tsn_seen) { 5662 stcb->asoc.send_sack = 1; 5663 } 5664 /* trigger send of any chunks in queue... */ 5665 trigger_send: 5666 #ifdef SCTP_AUDITING_ENABLED 5667 sctp_audit_log(0xE0, 2); 5668 sctp_auditing(1, inp, stcb, net); 5669 #endif 5670 SCTPDBG(SCTP_DEBUG_INPUT1, 5671 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5672 stcb->asoc.peers_rwnd, 5673 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5674 stcb->asoc.total_flight); 5675 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5676 5677 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5678 ((un_sent) && 5679 (stcb->asoc.peers_rwnd > 0 || 5680 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5681 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5682 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5683 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5684 } 5685 #ifdef SCTP_AUDITING_ENABLED 5686 sctp_audit_log(0xE0, 3); 5687 sctp_auditing(2, inp, stcb, net); 5688 #endif 5689 SCTP_TCB_UNLOCK(stcb); 5690 out_now: 5691 #ifdef INVARIANTS 5692 sctp_validate_no_locks(inp); 5693 #endif 5694 return; 5695 } 5696 5697 #if 0 5698 static void 5699 sctp_print_mbuf_chain(struct mbuf *m) 5700 { 5701 for (; m; m = SCTP_BUF_NEXT(m)) { 5702 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5703 if (SCTP_BUF_IS_EXTENDED(m)) 5704 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5705 } 5706 } 5707 5708 #endif 5709 5710 void 5711 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5712 { 5713 #ifdef SCTP_MBUF_LOGGING 5714 struct mbuf *mat; 5715 5716 #endif 5717 struct mbuf *m; 5718 int iphlen; 5719 uint32_t vrf_id = 0; 5720 uint8_t ecn_bits; 5721 struct ip *ip; 5722 struct sctphdr *sh; 5723 struct sctp_inpcb *inp = NULL; 5724 5725 uint32_t check, calc_check; 5726 struct sctp_nets *net; 5727 struct sctp_tcb *stcb = NULL; 5728 struct sctp_chunkhdr *ch; 5729 int refcount_up = 0; 5730 int length, mlen, offset; 5731 5732 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5733 SCTP_RELEASE_PKT(i_pak); 5734 return; 5735 } 5736 mlen = SCTP_HEADER_LEN(i_pak); 5737 iphlen = off; 5738 m = SCTP_HEADER_TO_CHAIN(i_pak); 5739 5740 net = NULL; 5741 SCTP_STAT_INCR(sctps_recvpackets); 5742 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5743 5744 5745 #ifdef SCTP_MBUF_LOGGING 5746 /* Log in any input mbufs */ 5747 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5748 mat = m; 5749 while (mat) { 5750 if (SCTP_BUF_IS_EXTENDED(mat)) { 5751 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5752 } 5753 mat = SCTP_BUF_NEXT(mat); 5754 } 5755 } 5756 #endif 5757 #ifdef SCTP_PACKET_LOGGING 5758 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5759 sctp_packet_log(m, mlen); 5760 #endif 5761 /* 5762 * Must take out the iphlen, since mlen expects this (only effect lb 5763 * case) 5764 */ 5765 mlen -= iphlen; 5766 5767 /* 5768 * Get IP, SCTP, and first chunk header together in first mbuf. 5769 */ 5770 ip = mtod(m, struct ip *); 5771 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5772 if (SCTP_BUF_LEN(m) < offset) { 5773 if ((m = m_pullup(m, offset)) == 0) { 5774 SCTP_STAT_INCR(sctps_hdrops); 5775 return; 5776 } 5777 ip = mtod(m, struct ip *); 5778 } 5779 /* validate mbuf chain length with IP payload length */ 5780 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5781 SCTP_STAT_INCR(sctps_hdrops); 5782 goto bad; 5783 } 5784 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5785 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5786 SCTPDBG(SCTP_DEBUG_INPUT1, 5787 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5788 5789 /* SCTP does not allow broadcasts or multicasts */ 5790 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5791 goto bad; 5792 } 5793 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5794 /* 5795 * We only look at broadcast if its a front state, All 5796 * others we will not have a tcb for anyway. 5797 */ 5798 goto bad; 5799 } 5800 /* validate SCTP checksum */ 5801 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5802 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5803 m->m_pkthdr.len, 5804 if_name(m->m_pkthdr.rcvif), 5805 m->m_pkthdr.csum_flags); 5806 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5807 SCTP_STAT_INCR(sctps_recvhwcrc); 5808 goto sctp_skip_csum_4; 5809 } 5810 check = sh->checksum; /* save incoming checksum */ 5811 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5812 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5813 (SCTP_IS_IT_LOOPBACK(m))) 5814 ) { 5815 SCTP_STAT_INCR(sctps_recvnocrc); 5816 goto sctp_skip_csum_4; 5817 } 5818 sh->checksum = 0; /* prepare for calc */ 5819 calc_check = sctp_calculate_cksum(m, iphlen); 5820 sh->checksum = check; 5821 SCTP_STAT_INCR(sctps_recvswcrc); 5822 if (calc_check != check) { 5823 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5824 calc_check, check, m, mlen, iphlen); 5825 5826 stcb = sctp_findassociation_addr(m, iphlen, 5827 offset - sizeof(*ch), 5828 sh, ch, &inp, &net, 5829 vrf_id); 5830 if ((net) && (port)) { 5831 if (net->port == 0) { 5832 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5833 } 5834 net->port = port; 5835 } 5836 if ((inp) && (stcb)) { 5837 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5838 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5839 } else if ((inp != NULL) && (stcb == NULL)) { 5840 refcount_up = 1; 5841 } 5842 SCTP_STAT_INCR(sctps_badsum); 5843 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5844 goto bad; 5845 } 5846 sctp_skip_csum_4: 5847 /* destination port of 0 is illegal, based on RFC2960. */ 5848 if (sh->dest_port == 0) { 5849 SCTP_STAT_INCR(sctps_hdrops); 5850 goto bad; 5851 } 5852 /* 5853 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5854 * IP/SCTP/first chunk header... 5855 */ 5856 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5857 sh, ch, &inp, &net, vrf_id); 5858 if ((net) && (port)) { 5859 if (net->port == 0) { 5860 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5861 } 5862 net->port = port; 5863 } 5864 /* inp's ref-count increased && stcb locked */ 5865 if (inp == NULL) { 5866 struct sctp_init_chunk *init_chk, chunk_buf; 5867 5868 SCTP_STAT_INCR(sctps_noport); 5869 #ifdef ICMP_BANDLIM 5870 /* 5871 * we use the bandwidth limiting to protect against sending 5872 * too many ABORTS all at once. In this case these count the 5873 * same as an ICMP message. 5874 */ 5875 if (badport_bandlim(0) < 0) 5876 goto bad; 5877 #endif /* ICMP_BANDLIM */ 5878 SCTPDBG(SCTP_DEBUG_INPUT1, 5879 "Sending a ABORT from packet entry!\n"); 5880 if (ch->chunk_type == SCTP_INITIATION) { 5881 /* 5882 * we do a trick here to get the INIT tag, dig in 5883 * and get the tag from the INIT and put it in the 5884 * common header. 5885 */ 5886 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5887 iphlen + sizeof(*sh), sizeof(*init_chk), 5888 (uint8_t *) & chunk_buf); 5889 if (init_chk != NULL) 5890 sh->v_tag = init_chk->init.initiate_tag; 5891 } 5892 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5893 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5894 goto bad; 5895 } 5896 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5897 goto bad; 5898 } 5899 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5900 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5901 goto bad; 5902 } else if (stcb == NULL) { 5903 refcount_up = 1; 5904 } 5905 #ifdef IPSEC 5906 /* 5907 * I very much doubt any of the IPSEC stuff will work but I have no 5908 * idea, so I will leave it in place. 5909 */ 5910 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5911 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5912 SCTP_STAT_INCR(sctps_hdrops); 5913 goto bad; 5914 } 5915 #endif /* IPSEC */ 5916 5917 /* 5918 * common chunk processing 5919 */ 5920 length = ip->ip_len + iphlen; 5921 offset -= sizeof(struct sctp_chunkhdr); 5922 5923 ecn_bits = ip->ip_tos; 5924 5925 /* sa_ignore NO_NULL_CHK */ 5926 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5927 inp, stcb, net, ecn_bits, vrf_id, port); 5928 /* inp's ref-count reduced && stcb unlocked */ 5929 if (m) { 5930 sctp_m_freem(m); 5931 } 5932 if ((inp) && (refcount_up)) { 5933 /* reduce ref-count */ 5934 SCTP_INP_DECR_REF(inp); 5935 } 5936 return; 5937 bad: 5938 if (stcb) { 5939 SCTP_TCB_UNLOCK(stcb); 5940 } 5941 if ((inp) && (refcount_up)) { 5942 /* reduce ref-count */ 5943 SCTP_INP_DECR_REF(inp); 5944 } 5945 if (m) { 5946 sctp_m_freem(m); 5947 } 5948 return; 5949 } 5950 void 5951 sctp_input(i_pak, off) 5952 struct mbuf *i_pak; 5953 int off; 5954 { 5955 sctp_input_with_port(i_pak, off, 0); 5956 }
Cache object: e47d393abb32a497ffeca12697c36513
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