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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/8.0/sys/netinet/sctp_input.c 201679 2010-01-06 21:45:30Z simon $"); 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 /* 347 * EY 05/13/08 - nr_sack: initialize nr_mapping array's base tsn 348 * like above 349 */ 350 asoc->nr_mapping_array_base_tsn = ntohl(init->initial_tsn); 351 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 352 asoc->last_echo_tsn = asoc->asconf_seq_in; 353 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 354 /* open the requested streams */ 355 356 if (asoc->strmin != NULL) { 357 /* Free the old ones */ 358 struct sctp_queued_to_read *ctl; 359 360 for (i = 0; i < asoc->streamincnt; i++) { 361 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 362 while (ctl) { 363 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 364 sctp_free_remote_addr(ctl->whoFrom); 365 ctl->whoFrom = NULL; 366 sctp_m_freem(ctl->data); 367 ctl->data = NULL; 368 sctp_free_a_readq(stcb, ctl); 369 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 370 } 371 } 372 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 373 } 374 asoc->streamincnt = ntohs(init->num_outbound_streams); 375 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 376 asoc->streamincnt = MAX_SCTP_STREAMS; 377 } 378 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 379 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 380 if (asoc->strmin == NULL) { 381 /* we didn't get memory for the streams! */ 382 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 383 return (-1); 384 } 385 for (i = 0; i < asoc->streamincnt; i++) { 386 asoc->strmin[i].stream_no = i; 387 asoc->strmin[i].last_sequence_delivered = 0xffff; 388 /* 389 * U-stream ranges will be set when the cookie is unpacked. 390 * Or for the INIT sender they are un set (if pr-sctp not 391 * supported) when the INIT-ACK arrives. 392 */ 393 TAILQ_INIT(&asoc->strmin[i].inqueue); 394 asoc->strmin[i].delivery_started = 0; 395 } 396 /* 397 * load_address_from_init will put the addresses into the 398 * association when the COOKIE is processed or the INIT-ACK is 399 * processed. Both types of COOKIE's existing and new call this 400 * routine. It will remove addresses that are no longer in the 401 * association (for the restarting case where addresses are 402 * removed). Up front when the INIT arrives we will discard it if it 403 * is a restart and new addresses have been added. 404 */ 405 /* sa_ignore MEMLEAK */ 406 return (0); 407 } 408 409 /* 410 * INIT-ACK message processing/consumption returns value < 0 on error 411 */ 412 static int 413 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 414 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 415 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 416 { 417 struct sctp_association *asoc; 418 struct mbuf *op_err; 419 int retval, abort_flag; 420 uint32_t initack_limit; 421 int nat_friendly = 0; 422 423 /* First verify that we have no illegal param's */ 424 abort_flag = 0; 425 op_err = NULL; 426 427 op_err = sctp_arethere_unrecognized_parameters(m, 428 (offset + sizeof(struct sctp_init_chunk)), 429 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 430 if (abort_flag) { 431 /* Send an abort and notify peer */ 432 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 433 *abort_no_unlock = 1; 434 return (-1); 435 } 436 asoc = &stcb->asoc; 437 asoc->peer_supports_nat = (uint8_t) nat_friendly; 438 /* process the peer's parameters in the INIT-ACK */ 439 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 440 if (retval < 0) { 441 return (retval); 442 } 443 initack_limit = offset + ntohs(cp->ch.chunk_length); 444 /* load all addresses */ 445 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 446 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 447 NULL))) { 448 /* Huh, we should abort */ 449 SCTPDBG(SCTP_DEBUG_INPUT1, 450 "Load addresses from INIT causes an abort %d\n", 451 retval); 452 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 453 NULL, 0, net->port); 454 *abort_no_unlock = 1; 455 return (-1); 456 } 457 /* if the peer doesn't support asconf, flush the asconf queue */ 458 if (asoc->peer_supports_asconf == 0) { 459 struct sctp_asconf_addr *aparam; 460 461 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 462 /* sa_ignore FREED_MEMORY */ 463 aparam = TAILQ_FIRST(&asoc->asconf_queue); 464 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 465 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 466 } 467 } 468 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 469 stcb->asoc.local_hmacs); 470 if (op_err) { 471 sctp_queue_op_err(stcb, op_err); 472 /* queuing will steal away the mbuf chain to the out queue */ 473 op_err = NULL; 474 } 475 /* extract the cookie and queue it to "echo" it back... */ 476 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 477 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 478 stcb->asoc.overall_error_count, 479 0, 480 SCTP_FROM_SCTP_INPUT, 481 __LINE__); 482 } 483 stcb->asoc.overall_error_count = 0; 484 net->error_count = 0; 485 486 /* 487 * Cancel the INIT timer, We do this first before queueing the 488 * cookie. We always cancel at the primary to assue that we are 489 * canceling the timer started by the INIT which always goes to the 490 * primary. 491 */ 492 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 493 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 494 495 /* calculate the RTO */ 496 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 497 498 retval = sctp_send_cookie_echo(m, offset, stcb, net); 499 if (retval < 0) { 500 /* 501 * No cookie, we probably should send a op error. But in any 502 * case if there is no cookie in the INIT-ACK, we can 503 * abandon the peer, its broke. 504 */ 505 if (retval == -3) { 506 /* We abort with an error of missing mandatory param */ 507 op_err = 508 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 509 if (op_err) { 510 /* 511 * Expand beyond to include the mandatory 512 * param cookie 513 */ 514 struct sctp_inv_mandatory_param *mp; 515 516 SCTP_BUF_LEN(op_err) = 517 sizeof(struct sctp_inv_mandatory_param); 518 mp = mtod(op_err, 519 struct sctp_inv_mandatory_param *); 520 /* Subtract the reserved param */ 521 mp->length = 522 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 523 mp->num_param = htonl(1); 524 mp->param = htons(SCTP_STATE_COOKIE); 525 mp->resv = 0; 526 } 527 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 528 sh, op_err, 0, net->port); 529 *abort_no_unlock = 1; 530 } 531 return (retval); 532 } 533 return (0); 534 } 535 536 static void 537 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 538 struct sctp_tcb *stcb, struct sctp_nets *net) 539 { 540 struct sockaddr_storage store; 541 struct sockaddr_in *sin; 542 struct sockaddr_in6 *sin6; 543 struct sctp_nets *r_net; 544 struct timeval tv; 545 int req_prim = 0; 546 547 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 548 /* Invalid length */ 549 return; 550 } 551 sin = (struct sockaddr_in *)&store; 552 sin6 = (struct sockaddr_in6 *)&store; 553 554 memset(&store, 0, sizeof(store)); 555 if (cp->heartbeat.hb_info.addr_family == AF_INET && 556 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 557 sin->sin_family = cp->heartbeat.hb_info.addr_family; 558 sin->sin_len = cp->heartbeat.hb_info.addr_len; 559 sin->sin_port = stcb->rport; 560 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 561 sizeof(sin->sin_addr)); 562 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 563 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 564 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 565 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 566 sin6->sin6_port = stcb->rport; 567 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 568 sizeof(sin6->sin6_addr)); 569 } else { 570 return; 571 } 572 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 573 if (r_net == NULL) { 574 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 575 return; 576 } 577 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 578 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 579 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 580 /* 581 * If the its a HB and it's random value is correct when can 582 * confirm the destination. 583 */ 584 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 585 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 586 stcb->asoc.primary_destination = r_net; 587 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 588 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 589 r_net = TAILQ_FIRST(&stcb->asoc.nets); 590 if (r_net != stcb->asoc.primary_destination) { 591 /* 592 * first one on the list is NOT the primary 593 * sctp_cmpaddr() is much more efficent if 594 * the primary is the first on the list, 595 * make it so. 596 */ 597 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 598 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 599 } 600 req_prim = 1; 601 } 602 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 603 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 604 } 605 r_net->error_count = 0; 606 r_net->hb_responded = 1; 607 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 608 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 609 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 610 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 611 r_net->dest_state |= SCTP_ADDR_REACHABLE; 612 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 613 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 614 /* now was it the primary? if so restore */ 615 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 616 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 617 } 618 } 619 /* 620 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 621 * set the destination to active state and set the cwnd to one or 622 * two MTU's based on whether PF1 or PF2 is being used. If a T3 623 * timer is running, for the destination, stop the timer because a 624 * PF-heartbeat was received. 625 */ 626 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 627 SCTP_BASE_SYSCTL(sctp_cmt_pf) && 628 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 629 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 630 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 631 stcb, net, 632 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 633 } 634 net->dest_state &= ~SCTP_ADDR_PF; 635 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 636 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 637 net, net->cwnd); 638 } 639 /* Now lets do a RTO with this */ 640 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 641 /* Mobility adaptation */ 642 if (req_prim) { 643 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 644 SCTP_MOBILITY_BASE) || 645 sctp_is_mobility_feature_on(stcb->sctp_ep, 646 SCTP_MOBILITY_FASTHANDOFF)) && 647 sctp_is_mobility_feature_on(stcb->sctp_ep, 648 SCTP_MOBILITY_PRIM_DELETED)) { 649 650 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 651 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_FASTHANDOFF)) { 653 sctp_assoc_immediate_retrans(stcb, 654 stcb->asoc.primary_destination); 655 } 656 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 657 SCTP_MOBILITY_BASE)) { 658 sctp_move_chunks_from_deleted_prim(stcb, 659 stcb->asoc.primary_destination); 660 } 661 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 662 stcb->asoc.deleted_primary); 663 } 664 } 665 } 666 667 static int 668 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 669 { 670 /* 671 * return 0 means we want you to proceed with the abort non-zero 672 * means no abort processing 673 */ 674 struct sctpasochead *head; 675 676 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 677 /* generate a new vtag and send init */ 678 LIST_REMOVE(stcb, sctp_asocs); 679 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 680 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 681 /* 682 * put it in the bucket in the vtag hash of assoc's for the 683 * system 684 */ 685 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 686 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 687 return (1); 688 } 689 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 690 /* 691 * treat like a case where the cookie expired i.e.: - dump 692 * current cookie. - generate a new vtag. - resend init. 693 */ 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 697 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 698 sctp_stop_all_cookie_timers(stcb); 699 sctp_toss_old_cookies(stcb, &stcb->asoc); 700 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 701 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 702 /* 703 * put it in the bucket in the vtag hash of assoc's for the 704 * system 705 */ 706 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 707 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 708 return (1); 709 } 710 return (0); 711 } 712 713 static int 714 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 715 struct sctp_nets *net) 716 { 717 /* 718 * return 0 means we want you to proceed with the abort non-zero 719 * means no abort processing 720 */ 721 if (stcb->asoc.peer_supports_auth == 0) { 722 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 723 return (0); 724 } 725 sctp_asconf_send_nat_state_update(stcb, net); 726 return (1); 727 } 728 729 730 static void 731 sctp_handle_abort(struct sctp_abort_chunk *cp, 732 struct sctp_tcb *stcb, struct sctp_nets *net) 733 { 734 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 735 struct socket *so; 736 737 #endif 738 uint16_t len; 739 740 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 741 if (stcb == NULL) 742 return; 743 744 len = ntohs(cp->ch.chunk_length); 745 if (len > sizeof(struct sctp_chunkhdr)) { 746 /* 747 * Need to check the cause codes for our two magic nat 748 * aborts which don't kill the assoc necessarily. 749 */ 750 struct sctp_abort_chunk *cpnext; 751 struct sctp_missing_nat_state *natc; 752 uint16_t cause; 753 754 cpnext = cp; 755 cpnext++; 756 natc = (struct sctp_missing_nat_state *)cpnext; 757 cause = ntohs(natc->cause); 758 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 759 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 760 cp->ch.chunk_flags); 761 if (sctp_handle_nat_colliding_state(stcb)) { 762 return; 763 } 764 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 765 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 766 cp->ch.chunk_flags); 767 if (sctp_handle_nat_missing_state(stcb, net)) { 768 return; 769 } 770 } 771 } 772 /* stop any receive timers */ 773 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 774 /* notify user of the abort and clean up... */ 775 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 776 /* free the tcb */ 777 #if defined(SCTP_PANIC_ON_ABORT) 778 printf("stcb:%p state:%d rport:%d net:%p\n", 779 stcb, stcb->asoc.state, stcb->rport, net); 780 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 781 panic("Received an ABORT"); 782 } else { 783 printf("No panic its in state %x closed\n", stcb->asoc.state); 784 } 785 #endif 786 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 787 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 788 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 789 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 790 } 791 #ifdef SCTP_ASOCLOG_OF_TSNS 792 sctp_print_out_track_log(stcb); 793 #endif 794 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 795 so = SCTP_INP_SO(stcb->sctp_ep); 796 atomic_add_int(&stcb->asoc.refcnt, 1); 797 SCTP_TCB_UNLOCK(stcb); 798 SCTP_SOCKET_LOCK(so, 1); 799 SCTP_TCB_LOCK(stcb); 800 atomic_subtract_int(&stcb->asoc.refcnt, 1); 801 #endif 802 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 803 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 804 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 SCTP_SOCKET_UNLOCK(so, 1); 807 #endif 808 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 809 } 810 811 static void 812 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 813 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 814 { 815 struct sctp_association *asoc; 816 int some_on_streamwheel; 817 818 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 819 struct socket *so; 820 821 #endif 822 823 SCTPDBG(SCTP_DEBUG_INPUT2, 824 "sctp_handle_shutdown: handling SHUTDOWN\n"); 825 if (stcb == NULL) 826 return; 827 asoc = &stcb->asoc; 828 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 829 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 830 return; 831 } 832 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 833 /* Shutdown NOT the expected size */ 834 return; 835 } else { 836 sctp_update_acked(stcb, cp, net, abort_flag); 837 if (*abort_flag) { 838 return; 839 } 840 } 841 if (asoc->control_pdapi) { 842 /* 843 * With a normal shutdown we assume the end of last record. 844 */ 845 SCTP_INP_READ_LOCK(stcb->sctp_ep); 846 asoc->control_pdapi->end_added = 1; 847 asoc->control_pdapi->pdapi_aborted = 1; 848 asoc->control_pdapi = NULL; 849 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 850 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 851 so = SCTP_INP_SO(stcb->sctp_ep); 852 atomic_add_int(&stcb->asoc.refcnt, 1); 853 SCTP_TCB_UNLOCK(stcb); 854 SCTP_SOCKET_LOCK(so, 1); 855 SCTP_TCB_LOCK(stcb); 856 atomic_subtract_int(&stcb->asoc.refcnt, 1); 857 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 858 /* assoc was freed while we were unlocked */ 859 SCTP_SOCKET_UNLOCK(so, 1); 860 return; 861 } 862 #endif 863 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 864 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 865 SCTP_SOCKET_UNLOCK(so, 1); 866 #endif 867 } 868 /* goto SHUTDOWN_RECEIVED state to block new requests */ 869 if (stcb->sctp_socket) { 870 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 871 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 872 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 873 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 874 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 875 /* 876 * notify upper layer that peer has initiated a 877 * shutdown 878 */ 879 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 880 881 /* reset time */ 882 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 883 } 884 } 885 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 886 /* 887 * stop the shutdown timer, since we WILL move to 888 * SHUTDOWN-ACK-SENT. 889 */ 890 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 891 } 892 /* Now is there unsent data on a stream somewhere? */ 893 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 894 895 if (!TAILQ_EMPTY(&asoc->send_queue) || 896 !TAILQ_EMPTY(&asoc->sent_queue) || 897 some_on_streamwheel) { 898 /* By returning we will push more data out */ 899 return; 900 } else { 901 /* no outstanding data to send, so move on... */ 902 /* send SHUTDOWN-ACK */ 903 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 904 /* move to SHUTDOWN-ACK-SENT state */ 905 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 906 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 907 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 908 } 909 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 910 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 911 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 912 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 913 /* start SHUTDOWN timer */ 914 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 915 stcb, net); 916 } 917 } 918 919 static void 920 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 921 struct sctp_tcb *stcb, struct sctp_nets *net) 922 { 923 struct sctp_association *asoc; 924 925 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 926 struct socket *so; 927 928 so = SCTP_INP_SO(stcb->sctp_ep); 929 #endif 930 SCTPDBG(SCTP_DEBUG_INPUT2, 931 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 932 if (stcb == NULL) 933 return; 934 935 asoc = &stcb->asoc; 936 /* process according to association state */ 937 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 938 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 939 /* unexpected SHUTDOWN-ACK... so ignore... */ 940 SCTP_TCB_UNLOCK(stcb); 941 return; 942 } 943 if (asoc->control_pdapi) { 944 /* 945 * With a normal shutdown we assume the end of last record. 946 */ 947 SCTP_INP_READ_LOCK(stcb->sctp_ep); 948 asoc->control_pdapi->end_added = 1; 949 asoc->control_pdapi->pdapi_aborted = 1; 950 asoc->control_pdapi = NULL; 951 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 952 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 953 atomic_add_int(&stcb->asoc.refcnt, 1); 954 SCTP_TCB_UNLOCK(stcb); 955 SCTP_SOCKET_LOCK(so, 1); 956 SCTP_TCB_LOCK(stcb); 957 atomic_subtract_int(&stcb->asoc.refcnt, 1); 958 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 959 /* assoc was freed while we were unlocked */ 960 SCTP_SOCKET_UNLOCK(so, 1); 961 return; 962 } 963 #endif 964 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 965 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 966 SCTP_SOCKET_UNLOCK(so, 1); 967 #endif 968 } 969 /* are the queues empty? */ 970 if (!TAILQ_EMPTY(&asoc->send_queue) || 971 !TAILQ_EMPTY(&asoc->sent_queue) || 972 !TAILQ_EMPTY(&asoc->out_wheel)) { 973 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 974 } 975 /* stop the timer */ 976 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 977 /* send SHUTDOWN-COMPLETE */ 978 sctp_send_shutdown_complete(stcb, net); 979 /* notify upper layer protocol */ 980 if (stcb->sctp_socket) { 981 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 982 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 983 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 984 /* Set the connected flag to disconnected */ 985 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 986 } 987 } 988 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 989 /* free the TCB but first save off the ep */ 990 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 991 atomic_add_int(&stcb->asoc.refcnt, 1); 992 SCTP_TCB_UNLOCK(stcb); 993 SCTP_SOCKET_LOCK(so, 1); 994 SCTP_TCB_LOCK(stcb); 995 atomic_subtract_int(&stcb->asoc.refcnt, 1); 996 #endif 997 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 998 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 999 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1000 SCTP_SOCKET_UNLOCK(so, 1); 1001 #endif 1002 } 1003 1004 /* 1005 * Skip past the param header and then we will find the chunk that caused the 1006 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1007 * our peer must be broken. 1008 */ 1009 static void 1010 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1011 struct sctp_nets *net) 1012 { 1013 struct sctp_chunkhdr *chk; 1014 1015 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1016 switch (chk->chunk_type) { 1017 case SCTP_ASCONF_ACK: 1018 case SCTP_ASCONF: 1019 sctp_asconf_cleanup(stcb, net); 1020 break; 1021 case SCTP_FORWARD_CUM_TSN: 1022 stcb->asoc.peer_supports_prsctp = 0; 1023 break; 1024 default: 1025 SCTPDBG(SCTP_DEBUG_INPUT2, 1026 "Peer does not support chunk type %d(%x)??\n", 1027 chk->chunk_type, (uint32_t) chk->chunk_type); 1028 break; 1029 } 1030 } 1031 1032 /* 1033 * Skip past the param header and then we will find the param that caused the 1034 * problem. There are a number of param's in a ASCONF OR the prsctp param 1035 * these will turn of specific features. 1036 */ 1037 static void 1038 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1039 { 1040 struct sctp_paramhdr *pbad; 1041 1042 pbad = phdr + 1; 1043 switch (ntohs(pbad->param_type)) { 1044 /* pr-sctp draft */ 1045 case SCTP_PRSCTP_SUPPORTED: 1046 stcb->asoc.peer_supports_prsctp = 0; 1047 break; 1048 case SCTP_SUPPORTED_CHUNK_EXT: 1049 break; 1050 /* draft-ietf-tsvwg-addip-sctp */ 1051 case SCTP_HAS_NAT_SUPPORT: 1052 stcb->asoc.peer_supports_nat = 0; 1053 break; 1054 case SCTP_ECN_NONCE_SUPPORTED: 1055 stcb->asoc.peer_supports_ecn_nonce = 0; 1056 stcb->asoc.ecn_nonce_allowed = 0; 1057 stcb->asoc.ecn_allowed = 0; 1058 break; 1059 case SCTP_ADD_IP_ADDRESS: 1060 case SCTP_DEL_IP_ADDRESS: 1061 case SCTP_SET_PRIM_ADDR: 1062 stcb->asoc.peer_supports_asconf = 0; 1063 break; 1064 case SCTP_SUCCESS_REPORT: 1065 case SCTP_ERROR_CAUSE_IND: 1066 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1067 SCTPDBG(SCTP_DEBUG_INPUT2, 1068 "Turning off ASCONF to this strange peer\n"); 1069 stcb->asoc.peer_supports_asconf = 0; 1070 break; 1071 default: 1072 SCTPDBG(SCTP_DEBUG_INPUT2, 1073 "Peer does not support param type %d(%x)??\n", 1074 pbad->param_type, (uint32_t) pbad->param_type); 1075 break; 1076 } 1077 } 1078 1079 static int 1080 sctp_handle_error(struct sctp_chunkhdr *ch, 1081 struct sctp_tcb *stcb, struct sctp_nets *net) 1082 { 1083 int chklen; 1084 struct sctp_paramhdr *phdr; 1085 uint16_t error_type; 1086 uint16_t error_len; 1087 struct sctp_association *asoc; 1088 int adjust; 1089 1090 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1091 struct socket *so; 1092 1093 #endif 1094 1095 /* parse through all of the errors and process */ 1096 asoc = &stcb->asoc; 1097 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1098 sizeof(struct sctp_chunkhdr)); 1099 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1100 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1101 /* Process an Error Cause */ 1102 error_type = ntohs(phdr->param_type); 1103 error_len = ntohs(phdr->param_length); 1104 if ((error_len > chklen) || (error_len == 0)) { 1105 /* invalid param length for this param */ 1106 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1107 chklen, error_len); 1108 return (0); 1109 } 1110 switch (error_type) { 1111 case SCTP_CAUSE_INVALID_STREAM: 1112 case SCTP_CAUSE_MISSING_PARAM: 1113 case SCTP_CAUSE_INVALID_PARAM: 1114 case SCTP_CAUSE_NO_USER_DATA: 1115 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1116 error_type); 1117 break; 1118 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1120 ch->chunk_flags); 1121 if (sctp_handle_nat_colliding_state(stcb)) { 1122 return (0); 1123 } 1124 break; 1125 case SCTP_CAUSE_NAT_MISSING_STATE: 1126 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1127 ch->chunk_flags); 1128 if (sctp_handle_nat_missing_state(stcb, net)) { 1129 return (0); 1130 } 1131 break; 1132 case SCTP_CAUSE_STALE_COOKIE: 1133 /* 1134 * We only act if we have echoed a cookie and are 1135 * waiting. 1136 */ 1137 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1138 int *p; 1139 1140 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1141 /* Save the time doubled */ 1142 asoc->cookie_preserve_req = ntohl(*p) << 1; 1143 asoc->stale_cookie_count++; 1144 if (asoc->stale_cookie_count > 1145 asoc->max_init_times) { 1146 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1147 /* now free the asoc */ 1148 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1149 so = SCTP_INP_SO(stcb->sctp_ep); 1150 atomic_add_int(&stcb->asoc.refcnt, 1); 1151 SCTP_TCB_UNLOCK(stcb); 1152 SCTP_SOCKET_LOCK(so, 1); 1153 SCTP_TCB_LOCK(stcb); 1154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1155 #endif 1156 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1157 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1158 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1159 SCTP_SOCKET_UNLOCK(so, 1); 1160 #endif 1161 return (-1); 1162 } 1163 /* blast back to INIT state */ 1164 sctp_toss_old_cookies(stcb, &stcb->asoc); 1165 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1166 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1167 sctp_stop_all_cookie_timers(stcb); 1168 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1169 } 1170 break; 1171 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1172 /* 1173 * Nothing we can do here, we don't do hostname 1174 * addresses so if the peer does not like my IPv6 1175 * (or IPv4 for that matter) it does not matter. If 1176 * they don't support that type of address, they can 1177 * NOT possibly get that packet type... i.e. with no 1178 * IPv6 you can't recieve a IPv6 packet. so we can 1179 * safely ignore this one. If we ever added support 1180 * for HOSTNAME Addresses, then we would need to do 1181 * something here. 1182 */ 1183 break; 1184 case SCTP_CAUSE_UNRECOG_CHUNK: 1185 sctp_process_unrecog_chunk(stcb, phdr, net); 1186 break; 1187 case SCTP_CAUSE_UNRECOG_PARAM: 1188 sctp_process_unrecog_param(stcb, phdr); 1189 break; 1190 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1191 /* 1192 * We ignore this since the timer will drive out a 1193 * new cookie anyway and there timer will drive us 1194 * to send a SHUTDOWN_COMPLETE. We can't send one 1195 * here since we don't have their tag. 1196 */ 1197 break; 1198 case SCTP_CAUSE_DELETING_LAST_ADDR: 1199 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1200 case SCTP_CAUSE_DELETING_SRC_ADDR: 1201 /* 1202 * We should NOT get these here, but in a 1203 * ASCONF-ACK. 1204 */ 1205 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1206 error_type); 1207 break; 1208 case SCTP_CAUSE_OUT_OF_RESC: 1209 /* 1210 * And what, pray tell do we do with the fact that 1211 * the peer is out of resources? Not really sure we 1212 * could do anything but abort. I suspect this 1213 * should have came WITH an abort instead of in a 1214 * OP-ERROR. 1215 */ 1216 break; 1217 default: 1218 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1219 error_type); 1220 break; 1221 } 1222 adjust = SCTP_SIZE32(error_len); 1223 chklen -= adjust; 1224 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1225 } 1226 return (0); 1227 } 1228 1229 static int 1230 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1231 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1232 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1233 { 1234 struct sctp_init_ack *init_ack; 1235 struct mbuf *op_err; 1236 1237 SCTPDBG(SCTP_DEBUG_INPUT2, 1238 "sctp_handle_init_ack: handling INIT-ACK\n"); 1239 1240 if (stcb == NULL) { 1241 SCTPDBG(SCTP_DEBUG_INPUT2, 1242 "sctp_handle_init_ack: TCB is null\n"); 1243 return (-1); 1244 } 1245 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1246 /* Invalid length */ 1247 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1248 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1249 op_err, 0, net->port); 1250 *abort_no_unlock = 1; 1251 return (-1); 1252 } 1253 init_ack = &cp->init; 1254 /* validate parameters */ 1255 if (init_ack->initiate_tag == 0) { 1256 /* protocol error... send an abort */ 1257 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1258 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1259 op_err, 0, net->port); 1260 *abort_no_unlock = 1; 1261 return (-1); 1262 } 1263 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1264 /* protocol error... send an abort */ 1265 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1266 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1267 op_err, 0, net->port); 1268 *abort_no_unlock = 1; 1269 return (-1); 1270 } 1271 if (init_ack->num_inbound_streams == 0) { 1272 /* protocol error... send an abort */ 1273 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1274 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1275 op_err, 0, net->port); 1276 *abort_no_unlock = 1; 1277 return (-1); 1278 } 1279 if (init_ack->num_outbound_streams == 0) { 1280 /* protocol error... send an abort */ 1281 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1282 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1283 op_err, 0, net->port); 1284 *abort_no_unlock = 1; 1285 return (-1); 1286 } 1287 /* process according to association state... */ 1288 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1289 case SCTP_STATE_COOKIE_WAIT: 1290 /* this is the expected state for this chunk */ 1291 /* process the INIT-ACK parameters */ 1292 if (stcb->asoc.primary_destination->dest_state & 1293 SCTP_ADDR_UNCONFIRMED) { 1294 /* 1295 * The primary is where we sent the INIT, we can 1296 * always consider it confirmed when the INIT-ACK is 1297 * returned. Do this before we load addresses 1298 * though. 1299 */ 1300 stcb->asoc.primary_destination->dest_state &= 1301 ~SCTP_ADDR_UNCONFIRMED; 1302 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1303 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1304 } 1305 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1306 net, abort_no_unlock, vrf_id) < 0) { 1307 /* error in parsing parameters */ 1308 return (-1); 1309 } 1310 /* update our state */ 1311 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1312 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1313 1314 /* reset the RTO calc */ 1315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1316 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1317 stcb->asoc.overall_error_count, 1318 0, 1319 SCTP_FROM_SCTP_INPUT, 1320 __LINE__); 1321 } 1322 stcb->asoc.overall_error_count = 0; 1323 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1324 /* 1325 * collapse the init timer back in case of a exponential 1326 * backoff 1327 */ 1328 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1329 stcb, net); 1330 /* 1331 * the send at the end of the inbound data processing will 1332 * cause the cookie to be sent 1333 */ 1334 break; 1335 case SCTP_STATE_SHUTDOWN_SENT: 1336 /* incorrect state... discard */ 1337 break; 1338 case SCTP_STATE_COOKIE_ECHOED: 1339 /* incorrect state... discard */ 1340 break; 1341 case SCTP_STATE_OPEN: 1342 /* incorrect state... discard */ 1343 break; 1344 case SCTP_STATE_EMPTY: 1345 case SCTP_STATE_INUSE: 1346 default: 1347 /* incorrect state... discard */ 1348 return (-1); 1349 break; 1350 } 1351 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1352 return (0); 1353 } 1354 1355 static struct sctp_tcb * 1356 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1357 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1358 struct sctp_inpcb *inp, struct sctp_nets **netp, 1359 struct sockaddr *init_src, int *notification, 1360 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1361 uint32_t vrf_id, uint16_t port); 1362 1363 1364 /* 1365 * handle a state cookie for an existing association m: input packet mbuf 1366 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1367 * "split" mbuf and the cookie signature does not exist offset: offset into 1368 * mbuf to the cookie-echo chunk 1369 */ 1370 static struct sctp_tcb * 1371 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1372 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1373 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1374 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1375 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1376 { 1377 struct sctp_association *asoc; 1378 struct sctp_init_chunk *init_cp, init_buf; 1379 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1380 struct sctp_nets *net; 1381 struct mbuf *op_err; 1382 struct sctp_paramhdr *ph; 1383 int chk_length; 1384 int init_offset, initack_offset, i; 1385 int retval; 1386 int spec_flag = 0; 1387 uint32_t how_indx; 1388 1389 net = *netp; 1390 /* I know that the TCB is non-NULL from the caller */ 1391 asoc = &stcb->asoc; 1392 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1393 if (asoc->cookie_how[how_indx] == 0) 1394 break; 1395 } 1396 if (how_indx < sizeof(asoc->cookie_how)) { 1397 asoc->cookie_how[how_indx] = 1; 1398 } 1399 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1400 /* SHUTDOWN came in after sending INIT-ACK */ 1401 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1402 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1403 0, M_DONTWAIT, 1, MT_DATA); 1404 if (op_err == NULL) { 1405 /* FOOBAR */ 1406 return (NULL); 1407 } 1408 /* Set the len */ 1409 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1410 ph = mtod(op_err, struct sctp_paramhdr *); 1411 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1412 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1413 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1414 vrf_id, net->port); 1415 if (how_indx < sizeof(asoc->cookie_how)) 1416 asoc->cookie_how[how_indx] = 2; 1417 return (NULL); 1418 } 1419 /* 1420 * find and validate the INIT chunk in the cookie (peer's info) the 1421 * INIT should start after the cookie-echo header struct (chunk 1422 * header, state cookie header struct) 1423 */ 1424 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1425 1426 init_cp = (struct sctp_init_chunk *) 1427 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1428 (uint8_t *) & init_buf); 1429 if (init_cp == NULL) { 1430 /* could not pull a INIT chunk in cookie */ 1431 return (NULL); 1432 } 1433 chk_length = ntohs(init_cp->ch.chunk_length); 1434 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1435 return (NULL); 1436 } 1437 /* 1438 * find and validate the INIT-ACK chunk in the cookie (my info) the 1439 * INIT-ACK follows the INIT chunk 1440 */ 1441 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1442 initack_cp = (struct sctp_init_ack_chunk *) 1443 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1444 (uint8_t *) & initack_buf); 1445 if (initack_cp == NULL) { 1446 /* could not pull INIT-ACK chunk in cookie */ 1447 return (NULL); 1448 } 1449 chk_length = ntohs(initack_cp->ch.chunk_length); 1450 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1451 return (NULL); 1452 } 1453 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1454 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1455 /* 1456 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1457 * to get into the OPEN state 1458 */ 1459 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1460 /*- 1461 * Opps, this means that we somehow generated two vtag's 1462 * the same. I.e. we did: 1463 * Us Peer 1464 * <---INIT(tag=a)------ 1465 * ----INIT-ACK(tag=t)--> 1466 * ----INIT(tag=t)------> *1 1467 * <---INIT-ACK(tag=a)--- 1468 * <----CE(tag=t)------------- *2 1469 * 1470 * At point *1 we should be generating a different 1471 * tag t'. Which means we would throw away the CE and send 1472 * ours instead. Basically this is case C (throw away side). 1473 */ 1474 if (how_indx < sizeof(asoc->cookie_how)) 1475 asoc->cookie_how[how_indx] = 17; 1476 return (NULL); 1477 1478 } 1479 switch SCTP_GET_STATE 1480 (asoc) { 1481 case SCTP_STATE_COOKIE_WAIT: 1482 case SCTP_STATE_COOKIE_ECHOED: 1483 /* 1484 * INIT was sent but got a COOKIE_ECHO with the 1485 * correct tags... just accept it...but we must 1486 * process the init so that we can make sure we have 1487 * the right seq no's. 1488 */ 1489 /* First we must process the INIT !! */ 1490 retval = sctp_process_init(init_cp, stcb, net); 1491 if (retval < 0) { 1492 if (how_indx < sizeof(asoc->cookie_how)) 1493 asoc->cookie_how[how_indx] = 3; 1494 return (NULL); 1495 } 1496 /* we have already processed the INIT so no problem */ 1497 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1498 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1499 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1500 /* update current state */ 1501 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1502 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1503 else 1504 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1505 1506 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1507 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1508 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1509 stcb->sctp_ep, stcb, asoc->primary_destination); 1510 } 1511 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1512 sctp_stop_all_cookie_timers(stcb); 1513 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1514 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1515 (inp->sctp_socket->so_qlimit == 0) 1516 ) { 1517 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1518 struct socket *so; 1519 1520 #endif 1521 /* 1522 * Here is where collision would go if we 1523 * did a connect() and instead got a 1524 * init/init-ack/cookie done before the 1525 * init-ack came back.. 1526 */ 1527 stcb->sctp_ep->sctp_flags |= 1528 SCTP_PCB_FLAGS_CONNECTED; 1529 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1530 so = SCTP_INP_SO(stcb->sctp_ep); 1531 atomic_add_int(&stcb->asoc.refcnt, 1); 1532 SCTP_TCB_UNLOCK(stcb); 1533 SCTP_SOCKET_LOCK(so, 1); 1534 SCTP_TCB_LOCK(stcb); 1535 atomic_add_int(&stcb->asoc.refcnt, -1); 1536 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1537 SCTP_SOCKET_UNLOCK(so, 1); 1538 return (NULL); 1539 } 1540 #endif 1541 soisconnected(stcb->sctp_socket); 1542 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1543 SCTP_SOCKET_UNLOCK(so, 1); 1544 #endif 1545 } 1546 /* notify upper layer */ 1547 *notification = SCTP_NOTIFY_ASSOC_UP; 1548 /* 1549 * since we did not send a HB make sure we don't 1550 * double things 1551 */ 1552 net->hb_responded = 1; 1553 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1554 &cookie->time_entered, sctp_align_unsafe_makecopy); 1555 1556 if (stcb->asoc.sctp_autoclose_ticks && 1557 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1558 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1559 inp, stcb, NULL); 1560 } 1561 break; 1562 default: 1563 /* 1564 * we're in the OPEN state (or beyond), so peer must 1565 * have simply lost the COOKIE-ACK 1566 */ 1567 break; 1568 } /* end switch */ 1569 sctp_stop_all_cookie_timers(stcb); 1570 /* 1571 * We ignore the return code here.. not sure if we should 1572 * somehow abort.. but we do have an existing asoc. This 1573 * really should not fail. 1574 */ 1575 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1576 init_offset + sizeof(struct sctp_init_chunk), 1577 initack_offset, sh, init_src)) { 1578 if (how_indx < sizeof(asoc->cookie_how)) 1579 asoc->cookie_how[how_indx] = 4; 1580 return (NULL); 1581 } 1582 /* respond with a COOKIE-ACK */ 1583 sctp_toss_old_cookies(stcb, asoc); 1584 sctp_send_cookie_ack(stcb); 1585 if (how_indx < sizeof(asoc->cookie_how)) 1586 asoc->cookie_how[how_indx] = 5; 1587 return (stcb); 1588 } 1589 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1590 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1591 cookie->tie_tag_my_vtag == 0 && 1592 cookie->tie_tag_peer_vtag == 0) { 1593 /* 1594 * case C in Section 5.2.4 Table 2: XMOO silently discard 1595 */ 1596 if (how_indx < sizeof(asoc->cookie_how)) 1597 asoc->cookie_how[how_indx] = 6; 1598 return (NULL); 1599 } 1600 /* 1601 * If nat support, and the below and stcb is established, send back 1602 * a ABORT(colliding state) if we are established. 1603 */ 1604 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1605 (asoc->peer_supports_nat) && 1606 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1607 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1608 (asoc->peer_vtag == 0)))) { 1609 /* 1610 * Special case - Peer's support nat. We may have two init's 1611 * that we gave out the same tag on since one was not 1612 * established.. i.e. we get INIT from host-1 behind the nat 1613 * and we respond tag-a, we get a INIT from host-2 behind 1614 * the nat and we get tag-a again. Then we bring up host-1 1615 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1616 * Now we have colliding state. We must send an abort here 1617 * with colliding state indication. 1618 */ 1619 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1620 0, M_DONTWAIT, 1, MT_DATA); 1621 if (op_err == NULL) { 1622 /* FOOBAR */ 1623 return (NULL); 1624 } 1625 /* pre-reserve some space */ 1626 #ifdef INET6 1627 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1628 #else 1629 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1630 #endif 1631 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1632 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1633 /* Set the len */ 1634 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1635 ph = mtod(op_err, struct sctp_paramhdr *); 1636 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1637 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1638 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1639 return (NULL); 1640 } 1641 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1642 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1643 (asoc->peer_vtag == 0))) { 1644 /* 1645 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1646 * should be ok, re-accept peer info 1647 */ 1648 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1649 /* 1650 * Extension of case C. If we hit this, then the 1651 * random number generator returned the same vtag 1652 * when we first sent our INIT-ACK and when we later 1653 * sent our INIT. The side with the seq numbers that 1654 * are different will be the one that normnally 1655 * would have hit case C. This in effect "extends" 1656 * our vtags in this collision case to be 64 bits. 1657 * The same collision could occur aka you get both 1658 * vtag and seq number the same twice in a row.. but 1659 * is much less likely. If it did happen then we 1660 * would proceed through and bring up the assoc.. we 1661 * may end up with the wrong stream setup however.. 1662 * which would be bad.. but there is no way to 1663 * tell.. until we send on a stream that does not 1664 * exist :-) 1665 */ 1666 if (how_indx < sizeof(asoc->cookie_how)) 1667 asoc->cookie_how[how_indx] = 7; 1668 1669 return (NULL); 1670 } 1671 if (how_indx < sizeof(asoc->cookie_how)) 1672 asoc->cookie_how[how_indx] = 8; 1673 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1674 sctp_stop_all_cookie_timers(stcb); 1675 /* 1676 * since we did not send a HB make sure we don't double 1677 * things 1678 */ 1679 net->hb_responded = 1; 1680 if (stcb->asoc.sctp_autoclose_ticks && 1681 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1682 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1683 NULL); 1684 } 1685 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1686 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1687 1688 /* Note last_cwr_tsn? where is this used? */ 1689 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1690 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1691 /* 1692 * Ok the peer probably discarded our data (if we 1693 * echoed a cookie+data). So anything on the 1694 * sent_queue should be marked for retransmit, we 1695 * may not get something to kick us so it COULD 1696 * still take a timeout to move these.. but it can't 1697 * hurt to mark them. 1698 */ 1699 struct sctp_tmit_chunk *chk; 1700 1701 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1702 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1703 chk->sent = SCTP_DATAGRAM_RESEND; 1704 sctp_flight_size_decrease(chk); 1705 sctp_total_flight_decrease(stcb, chk); 1706 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1707 spec_flag++; 1708 } 1709 } 1710 1711 } 1712 /* process the INIT info (peer's info) */ 1713 retval = sctp_process_init(init_cp, stcb, net); 1714 if (retval < 0) { 1715 if (how_indx < sizeof(asoc->cookie_how)) 1716 asoc->cookie_how[how_indx] = 9; 1717 return (NULL); 1718 } 1719 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1720 init_offset + sizeof(struct sctp_init_chunk), 1721 initack_offset, sh, init_src)) { 1722 if (how_indx < sizeof(asoc->cookie_how)) 1723 asoc->cookie_how[how_indx] = 10; 1724 return (NULL); 1725 } 1726 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1727 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1728 *notification = SCTP_NOTIFY_ASSOC_UP; 1729 1730 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1731 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1732 (inp->sctp_socket->so_qlimit == 0)) { 1733 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1734 struct socket *so; 1735 1736 #endif 1737 stcb->sctp_ep->sctp_flags |= 1738 SCTP_PCB_FLAGS_CONNECTED; 1739 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1740 so = SCTP_INP_SO(stcb->sctp_ep); 1741 atomic_add_int(&stcb->asoc.refcnt, 1); 1742 SCTP_TCB_UNLOCK(stcb); 1743 SCTP_SOCKET_LOCK(so, 1); 1744 SCTP_TCB_LOCK(stcb); 1745 atomic_add_int(&stcb->asoc.refcnt, -1); 1746 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1747 SCTP_SOCKET_UNLOCK(so, 1); 1748 return (NULL); 1749 } 1750 #endif 1751 soisconnected(stcb->sctp_socket); 1752 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1753 SCTP_SOCKET_UNLOCK(so, 1); 1754 #endif 1755 } 1756 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1757 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1758 else 1759 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1760 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1761 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1762 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1763 } else { 1764 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1765 } 1766 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1767 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1768 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1769 stcb->sctp_ep, stcb, asoc->primary_destination); 1770 } 1771 sctp_stop_all_cookie_timers(stcb); 1772 sctp_toss_old_cookies(stcb, asoc); 1773 sctp_send_cookie_ack(stcb); 1774 if (spec_flag) { 1775 /* 1776 * only if we have retrans set do we do this. What 1777 * this call does is get only the COOKIE-ACK out and 1778 * then when we return the normal call to 1779 * sctp_chunk_output will get the retrans out behind 1780 * this. 1781 */ 1782 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1783 } 1784 if (how_indx < sizeof(asoc->cookie_how)) 1785 asoc->cookie_how[how_indx] = 11; 1786 1787 return (stcb); 1788 } 1789 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1790 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1791 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1792 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1793 cookie->tie_tag_peer_vtag != 0) { 1794 struct sctpasochead *head; 1795 1796 if (asoc->peer_supports_nat) { 1797 /* 1798 * This is a gross gross hack. just call the 1799 * cookie_new code since we are allowing a duplicate 1800 * association. I hope this works... 1801 */ 1802 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1803 inp, netp, init_src, notification, 1804 auth_skipped, auth_offset, auth_len, 1805 vrf_id, port)); 1806 } 1807 /* 1808 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1809 */ 1810 /* temp code */ 1811 if (how_indx < sizeof(asoc->cookie_how)) 1812 asoc->cookie_how[how_indx] = 12; 1813 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1814 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1815 1816 *sac_assoc_id = sctp_get_associd(stcb); 1817 /* notify upper layer */ 1818 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1819 atomic_add_int(&stcb->asoc.refcnt, 1); 1820 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1821 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1822 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1823 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1824 } 1825 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1826 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1827 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1828 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1829 } 1830 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1831 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1832 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1833 stcb->sctp_ep, stcb, asoc->primary_destination); 1834 1835 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1836 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1837 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1838 } 1839 asoc->pre_open_streams = 1840 ntohs(initack_cp->init.num_outbound_streams); 1841 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1842 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1843 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1844 1845 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1846 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1847 1848 asoc->str_reset_seq_in = asoc->init_seq_number; 1849 1850 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1851 if (asoc->mapping_array) { 1852 memset(asoc->mapping_array, 0, 1853 asoc->mapping_array_size); 1854 } 1855 /* EY 05/13/08 - nr_sack version of the above if statement */ 1856 if (asoc->nr_mapping_array && SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) 1857 && asoc->peer_supports_nr_sack) { 1858 memset(asoc->nr_mapping_array, 0, 1859 asoc->nr_mapping_array_size); 1860 } 1861 SCTP_TCB_UNLOCK(stcb); 1862 SCTP_INP_INFO_WLOCK(); 1863 SCTP_INP_WLOCK(stcb->sctp_ep); 1864 SCTP_TCB_LOCK(stcb); 1865 atomic_add_int(&stcb->asoc.refcnt, -1); 1866 /* send up all the data */ 1867 SCTP_TCB_SEND_LOCK(stcb); 1868 1869 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1870 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1871 stcb->asoc.strmout[i].stream_no = i; 1872 stcb->asoc.strmout[i].next_sequence_sent = 0; 1873 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1874 } 1875 /* process the INIT-ACK info (my info) */ 1876 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1877 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1878 1879 /* pull from vtag hash */ 1880 LIST_REMOVE(stcb, sctp_asocs); 1881 /* re-insert to new vtag position */ 1882 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1883 SCTP_BASE_INFO(hashasocmark))]; 1884 /* 1885 * put it in the bucket in the vtag hash of assoc's for the 1886 * system 1887 */ 1888 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1889 1890 /* process the INIT info (peer's info) */ 1891 SCTP_TCB_SEND_UNLOCK(stcb); 1892 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1893 SCTP_INP_INFO_WUNLOCK(); 1894 1895 retval = sctp_process_init(init_cp, stcb, net); 1896 if (retval < 0) { 1897 if (how_indx < sizeof(asoc->cookie_how)) 1898 asoc->cookie_how[how_indx] = 13; 1899 1900 return (NULL); 1901 } 1902 /* 1903 * since we did not send a HB make sure we don't double 1904 * things 1905 */ 1906 net->hb_responded = 1; 1907 1908 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1909 init_offset + sizeof(struct sctp_init_chunk), 1910 initack_offset, sh, init_src)) { 1911 if (how_indx < sizeof(asoc->cookie_how)) 1912 asoc->cookie_how[how_indx] = 14; 1913 1914 return (NULL); 1915 } 1916 /* respond with a COOKIE-ACK */ 1917 sctp_stop_all_cookie_timers(stcb); 1918 sctp_toss_old_cookies(stcb, asoc); 1919 sctp_send_cookie_ack(stcb); 1920 if (how_indx < sizeof(asoc->cookie_how)) 1921 asoc->cookie_how[how_indx] = 15; 1922 1923 return (stcb); 1924 } 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 16; 1927 /* all other cases... */ 1928 return (NULL); 1929 } 1930 1931 1932 /* 1933 * handle a state cookie for a new association m: input packet mbuf chain-- 1934 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1935 * and the cookie signature does not exist offset: offset into mbuf to the 1936 * cookie-echo chunk length: length of the cookie chunk to: where the init 1937 * was from returns a new TCB 1938 */ 1939 struct sctp_tcb * 1940 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1941 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1942 struct sctp_inpcb *inp, struct sctp_nets **netp, 1943 struct sockaddr *init_src, int *notification, 1944 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1945 uint32_t vrf_id, uint16_t port) 1946 { 1947 struct sctp_tcb *stcb; 1948 struct sctp_init_chunk *init_cp, init_buf; 1949 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1950 struct sockaddr_storage sa_store; 1951 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1952 struct sockaddr_in *sin; 1953 struct sockaddr_in6 *sin6; 1954 struct sctp_association *asoc; 1955 int chk_length; 1956 int init_offset, initack_offset, initack_limit; 1957 int retval; 1958 int error = 0; 1959 uint32_t old_tag; 1960 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1961 1962 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1963 struct socket *so; 1964 1965 so = SCTP_INP_SO(inp); 1966 #endif 1967 1968 /* 1969 * find and validate the INIT chunk in the cookie (peer's info) the 1970 * INIT should start after the cookie-echo header struct (chunk 1971 * header, state cookie header struct) 1972 */ 1973 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1974 init_cp = (struct sctp_init_chunk *) 1975 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1976 (uint8_t *) & init_buf); 1977 if (init_cp == NULL) { 1978 /* could not pull a INIT chunk in cookie */ 1979 SCTPDBG(SCTP_DEBUG_INPUT1, 1980 "process_cookie_new: could not pull INIT chunk hdr\n"); 1981 return (NULL); 1982 } 1983 chk_length = ntohs(init_cp->ch.chunk_length); 1984 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1985 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1986 return (NULL); 1987 } 1988 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1989 /* 1990 * find and validate the INIT-ACK chunk in the cookie (my info) the 1991 * INIT-ACK follows the INIT chunk 1992 */ 1993 initack_cp = (struct sctp_init_ack_chunk *) 1994 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1995 (uint8_t *) & initack_buf); 1996 if (initack_cp == NULL) { 1997 /* could not pull INIT-ACK chunk in cookie */ 1998 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1999 return (NULL); 2000 } 2001 chk_length = ntohs(initack_cp->ch.chunk_length); 2002 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2003 return (NULL); 2004 } 2005 /* 2006 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2007 * "initack_limit" value. This is because the chk_length field 2008 * includes the length of the cookie, but the cookie is omitted when 2009 * the INIT and INIT_ACK are tacked onto the cookie... 2010 */ 2011 initack_limit = offset + cookie_len; 2012 2013 /* 2014 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2015 * and popluate 2016 */ 2017 2018 /* 2019 * Here we do a trick, we set in NULL for the proc/thread argument. 2020 * We do this since in effect we only use the p argument when the 2021 * socket is unbound and we must do an implicit bind. Since we are 2022 * getting a cookie, we cannot be unbound. 2023 */ 2024 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 2025 ntohl(initack_cp->init.initiate_tag), vrf_id, 2026 (struct thread *)NULL 2027 ); 2028 if (stcb == NULL) { 2029 struct mbuf *op_err; 2030 2031 /* memory problem? */ 2032 SCTPDBG(SCTP_DEBUG_INPUT1, 2033 "process_cookie_new: no room for another TCB!\n"); 2034 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2035 2036 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2037 sh, op_err, vrf_id, port); 2038 return (NULL); 2039 } 2040 /* get the correct sctp_nets */ 2041 if (netp) 2042 *netp = sctp_findnet(stcb, init_src); 2043 2044 asoc = &stcb->asoc; 2045 /* get scope variables out of cookie */ 2046 asoc->ipv4_local_scope = cookie->ipv4_scope; 2047 asoc->site_scope = cookie->site_scope; 2048 asoc->local_scope = cookie->local_scope; 2049 asoc->loopback_scope = cookie->loopback_scope; 2050 2051 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2052 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2053 struct mbuf *op_err; 2054 2055 /* 2056 * Houston we have a problem. The EP changed while the 2057 * cookie was in flight. Only recourse is to abort the 2058 * association. 2059 */ 2060 atomic_add_int(&stcb->asoc.refcnt, 1); 2061 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2062 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2063 sh, op_err, vrf_id, port); 2064 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2065 SCTP_TCB_UNLOCK(stcb); 2066 SCTP_SOCKET_LOCK(so, 1); 2067 SCTP_TCB_LOCK(stcb); 2068 #endif 2069 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2070 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2071 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2072 SCTP_SOCKET_UNLOCK(so, 1); 2073 #endif 2074 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2075 return (NULL); 2076 } 2077 /* process the INIT-ACK info (my info) */ 2078 old_tag = asoc->my_vtag; 2079 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2080 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2081 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2082 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2083 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2084 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2085 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2086 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2087 asoc->str_reset_seq_in = asoc->init_seq_number; 2088 2089 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2090 2091 /* process the INIT info (peer's info) */ 2092 if (netp) 2093 retval = sctp_process_init(init_cp, stcb, *netp); 2094 else 2095 retval = 0; 2096 if (retval < 0) { 2097 atomic_add_int(&stcb->asoc.refcnt, 1); 2098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2099 SCTP_TCB_UNLOCK(stcb); 2100 SCTP_SOCKET_LOCK(so, 1); 2101 SCTP_TCB_LOCK(stcb); 2102 #endif 2103 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2104 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2105 SCTP_SOCKET_UNLOCK(so, 1); 2106 #endif 2107 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2108 return (NULL); 2109 } 2110 /* load all addresses */ 2111 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2112 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2113 init_src)) { 2114 atomic_add_int(&stcb->asoc.refcnt, 1); 2115 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2116 SCTP_TCB_UNLOCK(stcb); 2117 SCTP_SOCKET_LOCK(so, 1); 2118 SCTP_TCB_LOCK(stcb); 2119 #endif 2120 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2121 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2122 SCTP_SOCKET_UNLOCK(so, 1); 2123 #endif 2124 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2125 return (NULL); 2126 } 2127 /* 2128 * verify any preceding AUTH chunk that was skipped 2129 */ 2130 /* pull the local authentication parameters from the cookie/init-ack */ 2131 sctp_auth_get_cookie_params(stcb, m, 2132 initack_offset + sizeof(struct sctp_init_ack_chunk), 2133 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2134 if (auth_skipped) { 2135 struct sctp_auth_chunk *auth; 2136 2137 auth = (struct sctp_auth_chunk *) 2138 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2139 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2140 /* auth HMAC failed, dump the assoc and packet */ 2141 SCTPDBG(SCTP_DEBUG_AUTH1, 2142 "COOKIE-ECHO: AUTH failed\n"); 2143 atomic_add_int(&stcb->asoc.refcnt, 1); 2144 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2145 SCTP_TCB_UNLOCK(stcb); 2146 SCTP_SOCKET_LOCK(so, 1); 2147 SCTP_TCB_LOCK(stcb); 2148 #endif 2149 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2150 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2151 SCTP_SOCKET_UNLOCK(so, 1); 2152 #endif 2153 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2154 return (NULL); 2155 } else { 2156 /* remaining chunks checked... good to go */ 2157 stcb->asoc.authenticated = 1; 2158 } 2159 } 2160 /* update current state */ 2161 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2162 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2163 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2164 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2165 stcb->sctp_ep, stcb, asoc->primary_destination); 2166 } 2167 sctp_stop_all_cookie_timers(stcb); 2168 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2169 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2170 2171 /* 2172 * if we're doing ASCONFs, check to see if we have any new local 2173 * addresses that need to get added to the peer (eg. addresses 2174 * changed while cookie echo in flight). This needs to be done 2175 * after we go to the OPEN state to do the correct asconf 2176 * processing. else, make sure we have the correct addresses in our 2177 * lists 2178 */ 2179 2180 /* warning, we re-use sin, sin6, sa_store here! */ 2181 /* pull in local_address (our "from" address) */ 2182 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2183 /* source addr is IPv4 */ 2184 sin = (struct sockaddr_in *)initack_src; 2185 memset(sin, 0, sizeof(*sin)); 2186 sin->sin_family = AF_INET; 2187 sin->sin_len = sizeof(struct sockaddr_in); 2188 sin->sin_addr.s_addr = cookie->laddress[0]; 2189 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2190 /* source addr is IPv6 */ 2191 sin6 = (struct sockaddr_in6 *)initack_src; 2192 memset(sin6, 0, sizeof(*sin6)); 2193 sin6->sin6_family = AF_INET6; 2194 sin6->sin6_len = sizeof(struct sockaddr_in6); 2195 sin6->sin6_scope_id = cookie->scope_id; 2196 memcpy(&sin6->sin6_addr, cookie->laddress, 2197 sizeof(sin6->sin6_addr)); 2198 } else { 2199 atomic_add_int(&stcb->asoc.refcnt, 1); 2200 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2201 SCTP_TCB_UNLOCK(stcb); 2202 SCTP_SOCKET_LOCK(so, 1); 2203 SCTP_TCB_LOCK(stcb); 2204 #endif 2205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2207 SCTP_SOCKET_UNLOCK(so, 1); 2208 #endif 2209 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2210 return (NULL); 2211 } 2212 2213 /* set up to notify upper layer */ 2214 *notification = SCTP_NOTIFY_ASSOC_UP; 2215 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2216 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2217 (inp->sctp_socket->so_qlimit == 0)) { 2218 /* 2219 * This is an endpoint that called connect() how it got a 2220 * cookie that is NEW is a bit of a mystery. It must be that 2221 * the INIT was sent, but before it got there.. a complete 2222 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2223 * should have went to the other code.. not here.. oh well.. 2224 * a bit of protection is worth having.. 2225 */ 2226 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2227 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2228 atomic_add_int(&stcb->asoc.refcnt, 1); 2229 SCTP_TCB_UNLOCK(stcb); 2230 SCTP_SOCKET_LOCK(so, 1); 2231 SCTP_TCB_LOCK(stcb); 2232 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2233 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2234 SCTP_SOCKET_UNLOCK(so, 1); 2235 return (NULL); 2236 } 2237 #endif 2238 soisconnected(stcb->sctp_socket); 2239 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2240 SCTP_SOCKET_UNLOCK(so, 1); 2241 #endif 2242 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2243 (inp->sctp_socket->so_qlimit)) { 2244 /* 2245 * We don't want to do anything with this one. Since it is 2246 * the listening guy. The timer will get started for 2247 * accepted connections in the caller. 2248 */ 2249 ; 2250 } 2251 /* since we did not send a HB make sure we don't double things */ 2252 if ((netp) && (*netp)) 2253 (*netp)->hb_responded = 1; 2254 2255 if (stcb->asoc.sctp_autoclose_ticks && 2256 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2257 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2258 } 2259 /* calculate the RTT */ 2260 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2261 if ((netp) && (*netp)) { 2262 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2263 &cookie->time_entered, sctp_align_unsafe_makecopy); 2264 } 2265 /* respond with a COOKIE-ACK */ 2266 sctp_send_cookie_ack(stcb); 2267 2268 /* 2269 * check the address lists for any ASCONFs that need to be sent 2270 * AFTER the cookie-ack is sent 2271 */ 2272 sctp_check_address_list(stcb, m, 2273 initack_offset + sizeof(struct sctp_init_ack_chunk), 2274 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2275 initack_src, cookie->local_scope, cookie->site_scope, 2276 cookie->ipv4_scope, cookie->loopback_scope); 2277 2278 2279 return (stcb); 2280 } 2281 2282 /* 2283 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2284 * we NEED to make sure we are not already using the vtag. If so we 2285 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2286 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2287 SCTP_BASE_INFO(hashasocmark))]; 2288 LIST_FOREACH(stcb, head, sctp_asocs) { 2289 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2290 -- SEND ABORT - TRY AGAIN -- 2291 } 2292 } 2293 */ 2294 2295 /* 2296 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2297 * existing (non-NULL) TCB 2298 */ 2299 static struct mbuf * 2300 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2301 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2302 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2303 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2304 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2305 { 2306 struct sctp_state_cookie *cookie; 2307 struct sockaddr_in6 sin6; 2308 struct sockaddr_in sin; 2309 struct sctp_tcb *l_stcb = *stcb; 2310 struct sctp_inpcb *l_inp; 2311 struct sockaddr *to; 2312 sctp_assoc_t sac_restart_id; 2313 struct sctp_pcb *ep; 2314 struct mbuf *m_sig; 2315 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2316 uint8_t *sig; 2317 uint8_t cookie_ok = 0; 2318 unsigned int size_of_pkt, sig_offset, cookie_offset; 2319 unsigned int cookie_len; 2320 struct timeval now; 2321 struct timeval time_expires; 2322 struct sockaddr_storage dest_store; 2323 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2324 struct ip *iph; 2325 int notification = 0; 2326 struct sctp_nets *netl; 2327 int had_a_existing_tcb = 0; 2328 2329 SCTPDBG(SCTP_DEBUG_INPUT2, 2330 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2331 2332 if (inp_p == NULL) { 2333 return (NULL); 2334 } 2335 /* First get the destination address setup too. */ 2336 iph = mtod(m, struct ip *); 2337 switch (iph->ip_v) { 2338 case IPVERSION: 2339 { 2340 /* its IPv4 */ 2341 struct sockaddr_in *lsin; 2342 2343 lsin = (struct sockaddr_in *)(localep_sa); 2344 memset(lsin, 0, sizeof(*lsin)); 2345 lsin->sin_family = AF_INET; 2346 lsin->sin_len = sizeof(*lsin); 2347 lsin->sin_port = sh->dest_port; 2348 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2349 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2350 break; 2351 } 2352 #ifdef INET6 2353 case IPV6_VERSION >> 4: 2354 { 2355 /* its IPv6 */ 2356 struct ip6_hdr *ip6; 2357 struct sockaddr_in6 *lsin6; 2358 2359 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2360 memset(lsin6, 0, sizeof(*lsin6)); 2361 lsin6->sin6_family = AF_INET6; 2362 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2363 ip6 = mtod(m, struct ip6_hdr *); 2364 lsin6->sin6_port = sh->dest_port; 2365 lsin6->sin6_addr = ip6->ip6_dst; 2366 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2367 break; 2368 } 2369 #endif 2370 default: 2371 return (NULL); 2372 } 2373 2374 cookie = &cp->cookie; 2375 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2376 cookie_len = ntohs(cp->ch.chunk_length); 2377 2378 if ((cookie->peerport != sh->src_port) && 2379 (cookie->myport != sh->dest_port) && 2380 (cookie->my_vtag != sh->v_tag)) { 2381 /* 2382 * invalid ports or bad tag. Note that we always leave the 2383 * v_tag in the header in network order and when we stored 2384 * it in the my_vtag slot we also left it in network order. 2385 * This maintains the match even though it may be in the 2386 * opposite byte order of the machine :-> 2387 */ 2388 return (NULL); 2389 } 2390 if (cookie_len > size_of_pkt || 2391 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2392 sizeof(struct sctp_init_chunk) + 2393 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2394 /* cookie too long! or too small */ 2395 return (NULL); 2396 } 2397 /* 2398 * split off the signature into its own mbuf (since it should not be 2399 * calculated in the sctp_hmac_m() call). 2400 */ 2401 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2402 if (sig_offset > size_of_pkt) { 2403 /* packet not correct size! */ 2404 /* XXX this may already be accounted for earlier... */ 2405 return (NULL); 2406 } 2407 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2408 if (m_sig == NULL) { 2409 /* out of memory or ?? */ 2410 return (NULL); 2411 } 2412 #ifdef SCTP_MBUF_LOGGING 2413 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2414 struct mbuf *mat; 2415 2416 mat = m_sig; 2417 while (mat) { 2418 if (SCTP_BUF_IS_EXTENDED(mat)) { 2419 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2420 } 2421 mat = SCTP_BUF_NEXT(mat); 2422 } 2423 } 2424 #endif 2425 2426 /* 2427 * compute the signature/digest for the cookie 2428 */ 2429 ep = &(*inp_p)->sctp_ep; 2430 l_inp = *inp_p; 2431 if (l_stcb) { 2432 SCTP_TCB_UNLOCK(l_stcb); 2433 } 2434 SCTP_INP_RLOCK(l_inp); 2435 if (l_stcb) { 2436 SCTP_TCB_LOCK(l_stcb); 2437 } 2438 /* which cookie is it? */ 2439 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2440 (ep->current_secret_number != ep->last_secret_number)) { 2441 /* it's the old cookie */ 2442 (void)sctp_hmac_m(SCTP_HMAC, 2443 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2444 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2445 } else { 2446 /* it's the current cookie */ 2447 (void)sctp_hmac_m(SCTP_HMAC, 2448 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2449 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2450 } 2451 /* get the signature */ 2452 SCTP_INP_RUNLOCK(l_inp); 2453 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2454 if (sig == NULL) { 2455 /* couldn't find signature */ 2456 sctp_m_freem(m_sig); 2457 return (NULL); 2458 } 2459 /* compare the received digest with the computed digest */ 2460 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2461 /* try the old cookie? */ 2462 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2463 (ep->current_secret_number != ep->last_secret_number)) { 2464 /* compute digest with old */ 2465 (void)sctp_hmac_m(SCTP_HMAC, 2466 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2467 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2468 /* compare */ 2469 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2470 cookie_ok = 1; 2471 } 2472 } else { 2473 cookie_ok = 1; 2474 } 2475 2476 /* 2477 * Now before we continue we must reconstruct our mbuf so that 2478 * normal processing of any other chunks will work. 2479 */ 2480 { 2481 struct mbuf *m_at; 2482 2483 m_at = m; 2484 while (SCTP_BUF_NEXT(m_at) != NULL) { 2485 m_at = SCTP_BUF_NEXT(m_at); 2486 } 2487 SCTP_BUF_NEXT(m_at) = m_sig; 2488 } 2489 2490 if (cookie_ok == 0) { 2491 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2492 SCTPDBG(SCTP_DEBUG_INPUT2, 2493 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2494 (uint32_t) offset, cookie_offset, sig_offset); 2495 return (NULL); 2496 } 2497 /* 2498 * check the cookie timestamps to be sure it's not stale 2499 */ 2500 (void)SCTP_GETTIME_TIMEVAL(&now); 2501 /* Expire time is in Ticks, so we convert to seconds */ 2502 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2503 time_expires.tv_usec = cookie->time_entered.tv_usec; 2504 /* 2505 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2506 * is undefined. 2507 */ 2508 if (timevalcmp(&now, &time_expires, >)) { 2509 /* cookie is stale! */ 2510 struct mbuf *op_err; 2511 struct sctp_stale_cookie_msg *scm; 2512 uint32_t tim; 2513 2514 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2515 0, M_DONTWAIT, 1, MT_DATA); 2516 if (op_err == NULL) { 2517 /* FOOBAR */ 2518 return (NULL); 2519 } 2520 /* Set the len */ 2521 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2522 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2523 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2524 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2525 (sizeof(uint32_t)))); 2526 /* seconds to usec */ 2527 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2528 /* add in usec */ 2529 if (tim == 0) 2530 tim = now.tv_usec - cookie->time_entered.tv_usec; 2531 scm->time_usec = htonl(tim); 2532 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2533 vrf_id, port); 2534 return (NULL); 2535 } 2536 /* 2537 * Now we must see with the lookup address if we have an existing 2538 * asoc. This will only happen if we were in the COOKIE-WAIT state 2539 * and a INIT collided with us and somewhere the peer sent the 2540 * cookie on another address besides the single address our assoc 2541 * had for him. In this case we will have one of the tie-tags set at 2542 * least AND the address field in the cookie can be used to look it 2543 * up. 2544 */ 2545 to = NULL; 2546 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2547 memset(&sin6, 0, sizeof(sin6)); 2548 sin6.sin6_family = AF_INET6; 2549 sin6.sin6_len = sizeof(sin6); 2550 sin6.sin6_port = sh->src_port; 2551 sin6.sin6_scope_id = cookie->scope_id; 2552 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2553 sizeof(sin6.sin6_addr.s6_addr)); 2554 to = (struct sockaddr *)&sin6; 2555 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2556 memset(&sin, 0, sizeof(sin)); 2557 sin.sin_family = AF_INET; 2558 sin.sin_len = sizeof(sin); 2559 sin.sin_port = sh->src_port; 2560 sin.sin_addr.s_addr = cookie->address[0]; 2561 to = (struct sockaddr *)&sin; 2562 } else { 2563 /* This should not happen */ 2564 return (NULL); 2565 } 2566 if ((*stcb == NULL) && to) { 2567 /* Yep, lets check */ 2568 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2569 if (*stcb == NULL) { 2570 /* 2571 * We should have only got back the same inp. If we 2572 * got back a different ep we have a problem. The 2573 * original findep got back l_inp and now 2574 */ 2575 if (l_inp != *inp_p) { 2576 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2577 } 2578 } else { 2579 if (*locked_tcb == NULL) { 2580 /* 2581 * In this case we found the assoc only 2582 * after we locked the create lock. This 2583 * means we are in a colliding case and we 2584 * must make sure that we unlock the tcb if 2585 * its one of the cases where we throw away 2586 * the incoming packets. 2587 */ 2588 *locked_tcb = *stcb; 2589 2590 /* 2591 * We must also increment the inp ref count 2592 * since the ref_count flags was set when we 2593 * did not find the TCB, now we found it 2594 * which reduces the refcount.. we must 2595 * raise it back out to balance it all :-) 2596 */ 2597 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2598 if ((*stcb)->sctp_ep != l_inp) { 2599 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2600 (*stcb)->sctp_ep, l_inp); 2601 } 2602 } 2603 } 2604 } 2605 if (to == NULL) { 2606 return (NULL); 2607 } 2608 cookie_len -= SCTP_SIGNATURE_SIZE; 2609 if (*stcb == NULL) { 2610 /* this is the "normal" case... get a new TCB */ 2611 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2612 cookie_len, *inp_p, netp, to, ¬ification, 2613 auth_skipped, auth_offset, auth_len, vrf_id, port); 2614 } else { 2615 /* this is abnormal... cookie-echo on existing TCB */ 2616 had_a_existing_tcb = 1; 2617 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2618 cookie, cookie_len, *inp_p, *stcb, netp, to, 2619 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2620 } 2621 2622 if (*stcb == NULL) { 2623 /* still no TCB... must be bad cookie-echo */ 2624 return (NULL); 2625 } 2626 /* 2627 * Ok, we built an association so confirm the address we sent the 2628 * INIT-ACK to. 2629 */ 2630 netl = sctp_findnet(*stcb, to); 2631 /* 2632 * This code should in theory NOT run but 2633 */ 2634 if (netl == NULL) { 2635 /* TSNH! Huh, why do I need to add this address here? */ 2636 int ret; 2637 2638 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2639 SCTP_IN_COOKIE_PROC); 2640 netl = sctp_findnet(*stcb, to); 2641 } 2642 if (netl) { 2643 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2644 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2645 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2646 netl); 2647 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2648 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2649 } 2650 } 2651 if (*stcb) { 2652 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2653 *stcb, NULL); 2654 } 2655 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2656 if (!had_a_existing_tcb || 2657 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2658 /* 2659 * If we have a NEW cookie or the connect never 2660 * reached the connected state during collision we 2661 * must do the TCP accept thing. 2662 */ 2663 struct socket *so, *oso; 2664 struct sctp_inpcb *inp; 2665 2666 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2667 /* 2668 * For a restart we will keep the same 2669 * socket, no need to do anything. I THINK!! 2670 */ 2671 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2672 return (m); 2673 } 2674 oso = (*inp_p)->sctp_socket; 2675 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2676 SCTP_TCB_UNLOCK((*stcb)); 2677 so = sonewconn(oso, 0 2678 ); 2679 SCTP_TCB_LOCK((*stcb)); 2680 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2681 2682 if (so == NULL) { 2683 struct mbuf *op_err; 2684 2685 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2686 struct socket *pcb_so; 2687 2688 #endif 2689 /* Too many sockets */ 2690 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2691 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2692 sctp_abort_association(*inp_p, NULL, m, iphlen, 2693 sh, op_err, vrf_id, port); 2694 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2695 pcb_so = SCTP_INP_SO(*inp_p); 2696 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2697 SCTP_TCB_UNLOCK((*stcb)); 2698 SCTP_SOCKET_LOCK(pcb_so, 1); 2699 SCTP_TCB_LOCK((*stcb)); 2700 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2701 #endif 2702 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2703 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2704 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2705 #endif 2706 return (NULL); 2707 } 2708 inp = (struct sctp_inpcb *)so->so_pcb; 2709 SCTP_INP_INCR_REF(inp); 2710 /* 2711 * We add the unbound flag here so that if we get an 2712 * soabort() before we get the move_pcb done, we 2713 * will properly cleanup. 2714 */ 2715 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2716 SCTP_PCB_FLAGS_CONNECTED | 2717 SCTP_PCB_FLAGS_IN_TCPPOOL | 2718 SCTP_PCB_FLAGS_UNBOUND | 2719 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2720 SCTP_PCB_FLAGS_DONT_WAKE); 2721 inp->sctp_features = (*inp_p)->sctp_features; 2722 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2723 inp->sctp_socket = so; 2724 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2725 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2726 inp->sctp_context = (*inp_p)->sctp_context; 2727 inp->inp_starting_point_for_iterator = NULL; 2728 /* 2729 * copy in the authentication parameters from the 2730 * original endpoint 2731 */ 2732 if (inp->sctp_ep.local_hmacs) 2733 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2734 inp->sctp_ep.local_hmacs = 2735 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2736 if (inp->sctp_ep.local_auth_chunks) 2737 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2738 inp->sctp_ep.local_auth_chunks = 2739 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2740 2741 /* 2742 * Now we must move it from one hash table to 2743 * another and get the tcb in the right place. 2744 */ 2745 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2746 2747 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2748 SCTP_TCB_UNLOCK((*stcb)); 2749 2750 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2751 0); 2752 SCTP_TCB_LOCK((*stcb)); 2753 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2754 2755 2756 /* 2757 * now we must check to see if we were aborted while 2758 * the move was going on and the lock/unlock 2759 * happened. 2760 */ 2761 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2762 /* 2763 * yep it was, we leave the assoc attached 2764 * to the socket since the sctp_inpcb_free() 2765 * call will send an abort for us. 2766 */ 2767 SCTP_INP_DECR_REF(inp); 2768 return (NULL); 2769 } 2770 SCTP_INP_DECR_REF(inp); 2771 /* Switch over to the new guy */ 2772 *inp_p = inp; 2773 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2774 2775 /* 2776 * Pull it from the incomplete queue and wake the 2777 * guy 2778 */ 2779 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2780 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2781 SCTP_TCB_UNLOCK((*stcb)); 2782 SCTP_SOCKET_LOCK(so, 1); 2783 #endif 2784 soisconnected(so); 2785 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2786 SCTP_TCB_LOCK((*stcb)); 2787 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2788 SCTP_SOCKET_UNLOCK(so, 1); 2789 #endif 2790 return (m); 2791 } 2792 } 2793 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2794 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2795 } 2796 return (m); 2797 } 2798 2799 static void 2800 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2801 struct sctp_tcb *stcb, struct sctp_nets *net) 2802 { 2803 /* cp must not be used, others call this without a c-ack :-) */ 2804 struct sctp_association *asoc; 2805 2806 SCTPDBG(SCTP_DEBUG_INPUT2, 2807 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2808 if (stcb == NULL) 2809 return; 2810 2811 asoc = &stcb->asoc; 2812 2813 sctp_stop_all_cookie_timers(stcb); 2814 /* process according to association state */ 2815 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2816 /* state change only needed when I am in right state */ 2817 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2818 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2819 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2820 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2821 stcb->sctp_ep, stcb, asoc->primary_destination); 2822 2823 } 2824 /* update RTO */ 2825 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2826 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2827 if (asoc->overall_error_count == 0) { 2828 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2829 &asoc->time_entered, sctp_align_safe_nocopy); 2830 } 2831 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2832 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2833 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2834 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2835 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2836 struct socket *so; 2837 2838 #endif 2839 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2840 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2841 so = SCTP_INP_SO(stcb->sctp_ep); 2842 atomic_add_int(&stcb->asoc.refcnt, 1); 2843 SCTP_TCB_UNLOCK(stcb); 2844 SCTP_SOCKET_LOCK(so, 1); 2845 SCTP_TCB_LOCK(stcb); 2846 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2847 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2848 SCTP_SOCKET_UNLOCK(so, 1); 2849 return; 2850 } 2851 #endif 2852 soisconnected(stcb->sctp_socket); 2853 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2854 SCTP_SOCKET_UNLOCK(so, 1); 2855 #endif 2856 } 2857 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2858 stcb, net); 2859 /* 2860 * since we did not send a HB make sure we don't double 2861 * things 2862 */ 2863 net->hb_responded = 1; 2864 2865 if (stcb->asoc.sctp_autoclose_ticks && 2866 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2867 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2868 stcb->sctp_ep, stcb, NULL); 2869 } 2870 /* 2871 * send ASCONF if parameters are pending and ASCONFs are 2872 * allowed (eg. addresses changed when init/cookie echo were 2873 * in flight) 2874 */ 2875 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2876 (stcb->asoc.peer_supports_asconf) && 2877 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2878 #ifdef SCTP_TIMER_BASED_ASCONF 2879 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2880 stcb->sctp_ep, stcb, 2881 stcb->asoc.primary_destination); 2882 #else 2883 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2884 SCTP_ADDR_NOT_LOCKED); 2885 #endif 2886 } 2887 } 2888 /* Toss the cookie if I can */ 2889 sctp_toss_old_cookies(stcb, asoc); 2890 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2891 /* Restart the timer if we have pending data */ 2892 struct sctp_tmit_chunk *chk; 2893 2894 chk = TAILQ_FIRST(&asoc->sent_queue); 2895 if (chk) { 2896 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2897 stcb, chk->whoTo); 2898 } 2899 } 2900 } 2901 2902 static void 2903 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2904 struct sctp_tcb *stcb) 2905 { 2906 struct sctp_nets *net; 2907 struct sctp_tmit_chunk *lchk; 2908 uint32_t tsn; 2909 2910 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2911 return; 2912 } 2913 SCTP_STAT_INCR(sctps_recvecne); 2914 tsn = ntohl(cp->tsn); 2915 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2916 /* Also we make sure we disable the nonce_wait */ 2917 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2918 if (lchk == NULL) { 2919 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2920 } else { 2921 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2922 } 2923 stcb->asoc.nonce_wait_for_ecne = 0; 2924 stcb->asoc.nonce_sum_check = 0; 2925 2926 /* Find where it was sent, if possible */ 2927 net = NULL; 2928 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2929 while (lchk) { 2930 if (lchk->rec.data.TSN_seq == tsn) { 2931 net = lchk->whoTo; 2932 break; 2933 } 2934 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2935 break; 2936 lchk = TAILQ_NEXT(lchk, sctp_next); 2937 } 2938 if (net == NULL) 2939 /* default is we use the primary */ 2940 net = stcb->asoc.primary_destination; 2941 2942 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2943 /* 2944 * JRS - Use the congestion control given in the pluggable 2945 * CC module 2946 */ 2947 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2948 /* 2949 * we reduce once every RTT. So we will only lower cwnd at 2950 * the next sending seq i.e. the resync_tsn. 2951 */ 2952 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2953 } 2954 /* 2955 * We always send a CWR this way if our previous one was lost our 2956 * peer will get an update, or if it is not time again to reduce we 2957 * still get the cwr to the peer. 2958 */ 2959 sctp_send_cwr(stcb, net, tsn); 2960 } 2961 2962 static void 2963 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2964 { 2965 /* 2966 * Here we get a CWR from the peer. We must look in the outqueue and 2967 * make sure that we have a covered ECNE in teh control chunk part. 2968 * If so remove it. 2969 */ 2970 struct sctp_tmit_chunk *chk; 2971 struct sctp_ecne_chunk *ecne; 2972 2973 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2974 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2975 continue; 2976 } 2977 /* 2978 * Look for and remove if it is the right TSN. Since there 2979 * is only ONE ECNE on the control queue at any one time we 2980 * don't need to worry about more than one! 2981 */ 2982 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2983 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2984 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2985 /* this covers this ECNE, we can remove it */ 2986 stcb->asoc.ecn_echo_cnt_onq--; 2987 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2988 sctp_next); 2989 if (chk->data) { 2990 sctp_m_freem(chk->data); 2991 chk->data = NULL; 2992 } 2993 stcb->asoc.ctrl_queue_cnt--; 2994 sctp_free_a_chunk(stcb, chk); 2995 break; 2996 } 2997 } 2998 } 2999 3000 static void 3001 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3002 struct sctp_tcb *stcb, struct sctp_nets *net) 3003 { 3004 struct sctp_association *asoc; 3005 3006 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3007 struct socket *so; 3008 3009 #endif 3010 3011 SCTPDBG(SCTP_DEBUG_INPUT2, 3012 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3013 if (stcb == NULL) 3014 return; 3015 3016 asoc = &stcb->asoc; 3017 /* process according to association state */ 3018 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3019 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3020 SCTPDBG(SCTP_DEBUG_INPUT2, 3021 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3022 SCTP_TCB_UNLOCK(stcb); 3023 return; 3024 } 3025 /* notify upper layer protocol */ 3026 if (stcb->sctp_socket) { 3027 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3028 /* are the queues empty? they should be */ 3029 if (!TAILQ_EMPTY(&asoc->send_queue) || 3030 !TAILQ_EMPTY(&asoc->sent_queue) || 3031 !TAILQ_EMPTY(&asoc->out_wheel)) { 3032 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3033 } 3034 } 3035 /* stop the timer */ 3036 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3037 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3038 /* free the TCB */ 3039 SCTPDBG(SCTP_DEBUG_INPUT2, 3040 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3041 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3042 so = SCTP_INP_SO(stcb->sctp_ep); 3043 atomic_add_int(&stcb->asoc.refcnt, 1); 3044 SCTP_TCB_UNLOCK(stcb); 3045 SCTP_SOCKET_LOCK(so, 1); 3046 SCTP_TCB_LOCK(stcb); 3047 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3048 #endif 3049 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3050 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3051 SCTP_SOCKET_UNLOCK(so, 1); 3052 #endif 3053 return; 3054 } 3055 3056 static int 3057 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3058 struct sctp_nets *net, uint8_t flg) 3059 { 3060 switch (desc->chunk_type) { 3061 case SCTP_DATA: 3062 /* find the tsn to resend (possibly */ 3063 { 3064 uint32_t tsn; 3065 struct sctp_tmit_chunk *tp1; 3066 3067 tsn = ntohl(desc->tsn_ifany); 3068 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3069 while (tp1) { 3070 if (tp1->rec.data.TSN_seq == tsn) { 3071 /* found it */ 3072 break; 3073 } 3074 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3075 MAX_TSN)) { 3076 /* not found */ 3077 tp1 = NULL; 3078 break; 3079 } 3080 tp1 = TAILQ_NEXT(tp1, sctp_next); 3081 } 3082 if (tp1 == NULL) { 3083 /* 3084 * Do it the other way , aka without paying 3085 * attention to queue seq order. 3086 */ 3087 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3088 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3089 while (tp1) { 3090 if (tp1->rec.data.TSN_seq == tsn) { 3091 /* found it */ 3092 break; 3093 } 3094 tp1 = TAILQ_NEXT(tp1, sctp_next); 3095 } 3096 } 3097 if (tp1 == NULL) { 3098 SCTP_STAT_INCR(sctps_pdrptsnnf); 3099 } 3100 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3101 uint8_t *ddp; 3102 3103 if ((stcb->asoc.peers_rwnd == 0) && 3104 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3105 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3106 return (0); 3107 } 3108 if (stcb->asoc.peers_rwnd == 0 && 3109 (flg & SCTP_FROM_MIDDLE_BOX)) { 3110 SCTP_STAT_INCR(sctps_pdrpdizrw); 3111 return (0); 3112 } 3113 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3114 sizeof(struct sctp_data_chunk)); 3115 { 3116 unsigned int iii; 3117 3118 for (iii = 0; iii < sizeof(desc->data_bytes); 3119 iii++) { 3120 if (ddp[iii] != desc->data_bytes[iii]) { 3121 SCTP_STAT_INCR(sctps_pdrpbadd); 3122 return (-1); 3123 } 3124 } 3125 } 3126 /* 3127 * We zero out the nonce so resync not 3128 * needed 3129 */ 3130 tp1->rec.data.ect_nonce = 0; 3131 3132 if (tp1->do_rtt) { 3133 /* 3134 * this guy had a RTO calculation 3135 * pending on it, cancel it 3136 */ 3137 tp1->do_rtt = 0; 3138 } 3139 SCTP_STAT_INCR(sctps_pdrpmark); 3140 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3141 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3142 tp1->sent = SCTP_DATAGRAM_RESEND; 3143 /* 3144 * mark it as if we were doing a FR, since 3145 * we will be getting gap ack reports behind 3146 * the info from the router. 3147 */ 3148 tp1->rec.data.doing_fast_retransmit = 1; 3149 /* 3150 * mark the tsn with what sequences can 3151 * cause a new FR. 3152 */ 3153 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3154 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3155 } else { 3156 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3157 } 3158 3159 /* restart the timer */ 3160 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3161 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3162 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3163 stcb, tp1->whoTo); 3164 3165 /* fix counts and things */ 3166 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3167 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3168 tp1->whoTo->flight_size, 3169 tp1->book_size, 3170 (uintptr_t) stcb, 3171 tp1->rec.data.TSN_seq); 3172 } 3173 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3174 sctp_flight_size_decrease(tp1); 3175 sctp_total_flight_decrease(stcb, tp1); 3176 } 3177 } { 3178 /* audit code */ 3179 unsigned int audit; 3180 3181 audit = 0; 3182 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3183 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3184 audit++; 3185 } 3186 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3187 sctp_next) { 3188 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3189 audit++; 3190 } 3191 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3192 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3193 audit, stcb->asoc.sent_queue_retran_cnt); 3194 #ifndef SCTP_AUDITING_ENABLED 3195 stcb->asoc.sent_queue_retran_cnt = audit; 3196 #endif 3197 } 3198 } 3199 } 3200 break; 3201 case SCTP_ASCONF: 3202 { 3203 struct sctp_tmit_chunk *asconf; 3204 3205 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3206 sctp_next) { 3207 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3208 break; 3209 } 3210 } 3211 if (asconf) { 3212 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3213 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3214 asconf->sent = SCTP_DATAGRAM_RESEND; 3215 asconf->snd_count--; 3216 } 3217 } 3218 break; 3219 case SCTP_INITIATION: 3220 /* resend the INIT */ 3221 stcb->asoc.dropped_special_cnt++; 3222 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3223 /* 3224 * If we can get it in, in a few attempts we do 3225 * this, otherwise we let the timer fire. 3226 */ 3227 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3228 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3229 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3230 } 3231 break; 3232 case SCTP_SELECTIVE_ACK: 3233 /* resend the sack */ 3234 sctp_send_sack(stcb); 3235 break; 3236 /* EY for nr_sacks */ 3237 case SCTP_NR_SELECTIVE_ACK: 3238 sctp_send_nr_sack(stcb); /* EY resend the nr-sack */ 3239 break; 3240 case SCTP_HEARTBEAT_REQUEST: 3241 /* resend a demand HB */ 3242 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3243 /* 3244 * Only retransmit if we KNOW we wont destroy the 3245 * tcb 3246 */ 3247 (void)sctp_send_hb(stcb, 1, net); 3248 } 3249 break; 3250 case SCTP_SHUTDOWN: 3251 sctp_send_shutdown(stcb, net); 3252 break; 3253 case SCTP_SHUTDOWN_ACK: 3254 sctp_send_shutdown_ack(stcb, net); 3255 break; 3256 case SCTP_COOKIE_ECHO: 3257 { 3258 struct sctp_tmit_chunk *cookie; 3259 3260 cookie = NULL; 3261 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3262 sctp_next) { 3263 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3264 break; 3265 } 3266 } 3267 if (cookie) { 3268 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3269 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3270 cookie->sent = SCTP_DATAGRAM_RESEND; 3271 sctp_stop_all_cookie_timers(stcb); 3272 } 3273 } 3274 break; 3275 case SCTP_COOKIE_ACK: 3276 sctp_send_cookie_ack(stcb); 3277 break; 3278 case SCTP_ASCONF_ACK: 3279 /* resend last asconf ack */ 3280 sctp_send_asconf_ack(stcb); 3281 break; 3282 case SCTP_FORWARD_CUM_TSN: 3283 send_forward_tsn(stcb, &stcb->asoc); 3284 break; 3285 /* can't do anything with these */ 3286 case SCTP_PACKET_DROPPED: 3287 case SCTP_INITIATION_ACK: /* this should not happen */ 3288 case SCTP_HEARTBEAT_ACK: 3289 case SCTP_ABORT_ASSOCIATION: 3290 case SCTP_OPERATION_ERROR: 3291 case SCTP_SHUTDOWN_COMPLETE: 3292 case SCTP_ECN_ECHO: 3293 case SCTP_ECN_CWR: 3294 default: 3295 break; 3296 } 3297 return (0); 3298 } 3299 3300 void 3301 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3302 { 3303 int i; 3304 uint16_t temp; 3305 3306 /* 3307 * We set things to 0xffff since this is the last delivered sequence 3308 * and we will be sending in 0 after the reset. 3309 */ 3310 3311 if (number_entries) { 3312 for (i = 0; i < number_entries; i++) { 3313 temp = ntohs(list[i]); 3314 if (temp >= stcb->asoc.streamincnt) { 3315 continue; 3316 } 3317 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3318 } 3319 } else { 3320 list = NULL; 3321 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3322 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3323 } 3324 } 3325 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3326 } 3327 3328 static void 3329 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3330 { 3331 int i; 3332 3333 if (number_entries == 0) { 3334 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3335 stcb->asoc.strmout[i].next_sequence_sent = 0; 3336 } 3337 } else if (number_entries) { 3338 for (i = 0; i < number_entries; i++) { 3339 uint16_t temp; 3340 3341 temp = ntohs(list[i]); 3342 if (temp >= stcb->asoc.streamoutcnt) { 3343 /* no such stream */ 3344 continue; 3345 } 3346 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3347 } 3348 } 3349 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3350 } 3351 3352 3353 struct sctp_stream_reset_out_request * 3354 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3355 { 3356 struct sctp_association *asoc; 3357 struct sctp_stream_reset_out_req *req; 3358 struct sctp_stream_reset_out_request *r; 3359 struct sctp_tmit_chunk *chk; 3360 int len, clen; 3361 3362 asoc = &stcb->asoc; 3363 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3364 asoc->stream_reset_outstanding = 0; 3365 return (NULL); 3366 } 3367 if (stcb->asoc.str_reset == NULL) { 3368 asoc->stream_reset_outstanding = 0; 3369 return (NULL); 3370 } 3371 chk = stcb->asoc.str_reset; 3372 if (chk->data == NULL) { 3373 return (NULL); 3374 } 3375 if (bchk) { 3376 /* he wants a copy of the chk pointer */ 3377 *bchk = chk; 3378 } 3379 clen = chk->send_size; 3380 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3381 r = &req->sr_req; 3382 if (ntohl(r->request_seq) == seq) { 3383 /* found it */ 3384 return (r); 3385 } 3386 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3387 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3388 /* move to the next one, there can only be a max of two */ 3389 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3390 if (ntohl(r->request_seq) == seq) { 3391 return (r); 3392 } 3393 } 3394 /* that seq is not here */ 3395 return (NULL); 3396 } 3397 3398 static void 3399 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3400 { 3401 struct sctp_association *asoc; 3402 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3403 3404 if (stcb->asoc.str_reset == NULL) { 3405 return; 3406 } 3407 asoc = &stcb->asoc; 3408 3409 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3410 TAILQ_REMOVE(&asoc->control_send_queue, 3411 chk, 3412 sctp_next); 3413 if (chk->data) { 3414 sctp_m_freem(chk->data); 3415 chk->data = NULL; 3416 } 3417 asoc->ctrl_queue_cnt--; 3418 sctp_free_a_chunk(stcb, chk); 3419 /* sa_ignore NO_NULL_CHK */ 3420 stcb->asoc.str_reset = NULL; 3421 } 3422 3423 3424 static int 3425 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3426 uint32_t seq, uint32_t action, 3427 struct sctp_stream_reset_response *respin) 3428 { 3429 uint16_t type; 3430 int lparm_len; 3431 struct sctp_association *asoc = &stcb->asoc; 3432 struct sctp_tmit_chunk *chk; 3433 struct sctp_stream_reset_out_request *srparam; 3434 int number_entries; 3435 3436 if (asoc->stream_reset_outstanding == 0) { 3437 /* duplicate */ 3438 return (0); 3439 } 3440 if (seq == stcb->asoc.str_reset_seq_out) { 3441 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3442 if (srparam) { 3443 stcb->asoc.str_reset_seq_out++; 3444 type = ntohs(srparam->ph.param_type); 3445 lparm_len = ntohs(srparam->ph.param_length); 3446 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3447 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3448 asoc->stream_reset_out_is_outstanding = 0; 3449 if (asoc->stream_reset_outstanding) 3450 asoc->stream_reset_outstanding--; 3451 if (action == SCTP_STREAM_RESET_PERFORMED) { 3452 /* do it */ 3453 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3454 } else { 3455 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3456 } 3457 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3458 /* Answered my request */ 3459 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3460 if (asoc->stream_reset_outstanding) 3461 asoc->stream_reset_outstanding--; 3462 if (action != SCTP_STREAM_RESET_PERFORMED) { 3463 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3464 } 3465 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3466 /* Ok we now may have more streams */ 3467 if (asoc->stream_reset_outstanding) 3468 asoc->stream_reset_outstanding--; 3469 if (action == SCTP_STREAM_RESET_PERFORMED) { 3470 /* Put the new streams into effect */ 3471 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3472 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3473 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3474 } else { 3475 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3476 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3477 } 3478 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3479 /** 3480 * a) Adopt the new in tsn. 3481 * b) reset the map 3482 * c) Adopt the new out-tsn 3483 */ 3484 struct sctp_stream_reset_response_tsn *resp; 3485 struct sctp_forward_tsn_chunk fwdtsn; 3486 int abort_flag = 0; 3487 3488 if (respin == NULL) { 3489 /* huh ? */ 3490 return (0); 3491 } 3492 if (action == SCTP_STREAM_RESET_PERFORMED) { 3493 resp = (struct sctp_stream_reset_response_tsn *)respin; 3494 asoc->stream_reset_outstanding--; 3495 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3496 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3497 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3498 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3499 if (abort_flag) { 3500 return (1); 3501 } 3502 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3503 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3504 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3505 } 3506 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3507 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3508 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3509 3510 /* 3511 * EY 05/13/08 - nr_sack: to keep 3512 * nr_mapping array be consistent 3513 * with mapping_array 3514 */ 3515 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3516 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3517 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.mapping_array_base_tsn; 3518 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3519 } 3520 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3521 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3522 3523 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3524 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3525 3526 } 3527 } 3528 /* get rid of the request and get the request flags */ 3529 if (asoc->stream_reset_outstanding == 0) { 3530 sctp_clean_up_stream_reset(stcb); 3531 } 3532 } 3533 } 3534 return (0); 3535 } 3536 3537 static void 3538 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3539 struct sctp_tmit_chunk *chk, 3540 struct sctp_stream_reset_in_request *req, int trunc) 3541 { 3542 uint32_t seq; 3543 int len, i; 3544 int number_entries; 3545 uint16_t temp; 3546 3547 /* 3548 * peer wants me to send a str-reset to him for my outgoing seq's if 3549 * seq_in is right. 3550 */ 3551 struct sctp_association *asoc = &stcb->asoc; 3552 3553 seq = ntohl(req->request_seq); 3554 if (asoc->str_reset_seq_in == seq) { 3555 if (trunc) { 3556 /* Can't do it, since they exceeded our buffer size */ 3557 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3558 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3559 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3560 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3561 len = ntohs(req->ph.param_length); 3562 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3563 for (i = 0; i < number_entries; i++) { 3564 temp = ntohs(req->list_of_streams[i]); 3565 req->list_of_streams[i] = temp; 3566 } 3567 /* move the reset action back one */ 3568 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3569 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3570 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3571 asoc->str_reset_seq_out, 3572 seq, (asoc->sending_seq - 1)); 3573 asoc->stream_reset_out_is_outstanding = 1; 3574 asoc->str_reset = chk; 3575 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3576 stcb->asoc.stream_reset_outstanding++; 3577 } else { 3578 /* Can't do it, since we have sent one out */ 3579 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3580 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3581 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3582 } 3583 asoc->str_reset_seq_in++; 3584 } else if (asoc->str_reset_seq_in - 1 == seq) { 3585 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3586 } else if (asoc->str_reset_seq_in - 2 == seq) { 3587 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3588 } else { 3589 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3590 } 3591 } 3592 3593 static int 3594 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3595 struct sctp_tmit_chunk *chk, 3596 struct sctp_stream_reset_tsn_request *req) 3597 { 3598 /* reset all in and out and update the tsn */ 3599 /* 3600 * A) reset my str-seq's on in and out. B) Select a receive next, 3601 * and set cum-ack to it. Also process this selected number as a 3602 * fwd-tsn as well. C) set in the response my next sending seq. 3603 */ 3604 struct sctp_forward_tsn_chunk fwdtsn; 3605 struct sctp_association *asoc = &stcb->asoc; 3606 int abort_flag = 0; 3607 uint32_t seq; 3608 3609 seq = ntohl(req->request_seq); 3610 if (asoc->str_reset_seq_in == seq) { 3611 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3612 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3613 fwdtsn.ch.chunk_flags = 0; 3614 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3615 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3616 if (abort_flag) { 3617 return (1); 3618 } 3619 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3620 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3621 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3622 } 3623 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3624 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3625 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3626 /* 3627 * EY 05/13/08 -nr_sack: to keep nr_mapping array consistent 3628 * with mapping array 3629 */ 3630 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3631 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3632 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3633 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3634 } 3635 atomic_add_int(&stcb->asoc.sending_seq, 1); 3636 /* save off historical data for retrans */ 3637 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3638 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3639 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3640 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3641 3642 sctp_add_stream_reset_result_tsn(chk, 3643 ntohl(req->request_seq), 3644 SCTP_STREAM_RESET_PERFORMED, 3645 stcb->asoc.sending_seq, 3646 stcb->asoc.mapping_array_base_tsn); 3647 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3648 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3649 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3650 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3651 3652 asoc->str_reset_seq_in++; 3653 } else if (asoc->str_reset_seq_in - 1 == seq) { 3654 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3655 stcb->asoc.last_sending_seq[0], 3656 stcb->asoc.last_base_tsnsent[0] 3657 ); 3658 } else if (asoc->str_reset_seq_in - 2 == seq) { 3659 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3660 stcb->asoc.last_sending_seq[1], 3661 stcb->asoc.last_base_tsnsent[1] 3662 ); 3663 } else { 3664 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3665 } 3666 return (0); 3667 } 3668 3669 static void 3670 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3671 struct sctp_tmit_chunk *chk, 3672 struct sctp_stream_reset_out_request *req, int trunc) 3673 { 3674 uint32_t seq, tsn; 3675 int number_entries, len; 3676 struct sctp_association *asoc = &stcb->asoc; 3677 3678 seq = ntohl(req->request_seq); 3679 3680 /* now if its not a duplicate we process it */ 3681 if (asoc->str_reset_seq_in == seq) { 3682 len = ntohs(req->ph.param_length); 3683 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3684 /* 3685 * the sender is resetting, handle the list issue.. we must 3686 * a) verify if we can do the reset, if so no problem b) If 3687 * we can't do the reset we must copy the request. c) queue 3688 * it, and setup the data in processor to trigger it off 3689 * when needed and dequeue all the queued data. 3690 */ 3691 tsn = ntohl(req->send_reset_at_tsn); 3692 3693 /* move the reset action back one */ 3694 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3695 if (trunc) { 3696 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3697 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3698 } else if ((tsn == asoc->cumulative_tsn) || 3699 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3700 /* we can do it now */ 3701 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3702 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3703 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3704 } else { 3705 /* 3706 * we must queue it up and thus wait for the TSN's 3707 * to arrive that are at or before tsn 3708 */ 3709 struct sctp_stream_reset_list *liste; 3710 int siz; 3711 3712 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3713 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3714 siz, SCTP_M_STRESET); 3715 if (liste == NULL) { 3716 /* gak out of memory */ 3717 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3718 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3719 return; 3720 } 3721 liste->tsn = tsn; 3722 liste->number_entries = number_entries; 3723 memcpy(&liste->req, req, 3724 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3725 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3726 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3727 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3728 } 3729 asoc->str_reset_seq_in++; 3730 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3731 /* 3732 * one seq back, just echo back last action since my 3733 * response was lost. 3734 */ 3735 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3736 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3737 /* 3738 * two seq back, just echo back last action since my 3739 * response was lost. 3740 */ 3741 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3742 } else { 3743 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3744 } 3745 } 3746 3747 static void 3748 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3749 struct sctp_stream_reset_add_strm *str_add) 3750 { 3751 /* 3752 * Peer is requesting to add more streams. If its within our 3753 * max-streams we will allow it. 3754 */ 3755 uint16_t num_stream, i; 3756 uint32_t seq; 3757 struct sctp_association *asoc = &stcb->asoc; 3758 struct sctp_queued_to_read *ctl; 3759 3760 /* Get the number. */ 3761 seq = ntohl(str_add->request_seq); 3762 num_stream = ntohs(str_add->number_of_streams); 3763 /* Now what would be the new total? */ 3764 if (asoc->str_reset_seq_in == seq) { 3765 num_stream += stcb->asoc.streamincnt; 3766 if (num_stream > stcb->asoc.max_inbound_streams) { 3767 /* We must reject it they ask for to many */ 3768 denied: 3769 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3770 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3771 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3772 } else { 3773 /* Ok, we can do that :-) */ 3774 struct sctp_stream_in *oldstrm; 3775 3776 /* save off the old */ 3777 oldstrm = stcb->asoc.strmin; 3778 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3779 (num_stream * sizeof(struct sctp_stream_in)), 3780 SCTP_M_STRMI); 3781 if (stcb->asoc.strmin == NULL) { 3782 stcb->asoc.strmin = oldstrm; 3783 goto denied; 3784 } 3785 /* copy off the old data */ 3786 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3787 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3788 stcb->asoc.strmin[i].stream_no = i; 3789 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3790 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3791 /* now anything on those queues? */ 3792 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) { 3793 ctl = TAILQ_FIRST(&oldstrm[i].inqueue); 3794 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3795 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3796 } 3797 } 3798 /* Init the new streams */ 3799 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3800 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3801 stcb->asoc.strmin[i].stream_no = i; 3802 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3803 stcb->asoc.strmin[i].delivery_started = 0; 3804 } 3805 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3806 /* update the size */ 3807 stcb->asoc.streamincnt = num_stream; 3808 /* Send the ack */ 3809 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3810 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3811 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3812 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3813 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3814 } 3815 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3816 /* 3817 * one seq back, just echo back last action since my 3818 * response was lost. 3819 */ 3820 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3821 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3822 /* 3823 * two seq back, just echo back last action since my 3824 * response was lost. 3825 */ 3826 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3827 } else { 3828 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3829 3830 } 3831 } 3832 3833 #ifdef __GNUC__ 3834 __attribute__((noinline)) 3835 #endif 3836 static int 3837 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3838 struct sctp_stream_reset_out_req *sr_req) 3839 { 3840 int chk_length, param_len, ptype; 3841 struct sctp_paramhdr pstore; 3842 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3843 3844 uint32_t seq; 3845 int num_req = 0; 3846 int trunc = 0; 3847 struct sctp_tmit_chunk *chk; 3848 struct sctp_chunkhdr *ch; 3849 struct sctp_paramhdr *ph; 3850 int ret_code = 0; 3851 int num_param = 0; 3852 3853 /* now it may be a reset or a reset-response */ 3854 chk_length = ntohs(sr_req->ch.chunk_length); 3855 3856 /* setup for adding the response */ 3857 sctp_alloc_a_chunk(stcb, chk); 3858 if (chk == NULL) { 3859 return (ret_code); 3860 } 3861 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3862 chk->rec.chunk_id.can_take_data = 0; 3863 chk->asoc = &stcb->asoc; 3864 chk->no_fr_allowed = 0; 3865 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3866 chk->book_size_scale = 0; 3867 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3868 if (chk->data == NULL) { 3869 strres_nochunk: 3870 if (chk->data) { 3871 sctp_m_freem(chk->data); 3872 chk->data = NULL; 3873 } 3874 sctp_free_a_chunk(stcb, chk); 3875 return (ret_code); 3876 } 3877 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3878 3879 /* setup chunk parameters */ 3880 chk->sent = SCTP_DATAGRAM_UNSENT; 3881 chk->snd_count = 0; 3882 chk->whoTo = stcb->asoc.primary_destination; 3883 atomic_add_int(&chk->whoTo->ref_count, 1); 3884 3885 ch = mtod(chk->data, struct sctp_chunkhdr *); 3886 ch->chunk_type = SCTP_STREAM_RESET; 3887 ch->chunk_flags = 0; 3888 ch->chunk_length = htons(chk->send_size); 3889 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3890 offset += sizeof(struct sctp_chunkhdr); 3891 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3892 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3893 if (ph == NULL) 3894 break; 3895 param_len = ntohs(ph->param_length); 3896 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3897 /* bad param */ 3898 break; 3899 } 3900 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3901 (uint8_t *) & cstore); 3902 ptype = ntohs(ph->param_type); 3903 num_param++; 3904 if (param_len > (int)sizeof(cstore)) { 3905 trunc = 1; 3906 } else { 3907 trunc = 0; 3908 } 3909 3910 if (num_param > SCTP_MAX_RESET_PARAMS) { 3911 /* hit the max of parameters already sorry.. */ 3912 break; 3913 } 3914 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3915 struct sctp_stream_reset_out_request *req_out; 3916 3917 req_out = (struct sctp_stream_reset_out_request *)ph; 3918 num_req++; 3919 if (stcb->asoc.stream_reset_outstanding) { 3920 seq = ntohl(req_out->response_seq); 3921 if (seq == stcb->asoc.str_reset_seq_out) { 3922 /* implicit ack */ 3923 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3924 } 3925 } 3926 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3927 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3928 struct sctp_stream_reset_add_strm *str_add; 3929 3930 str_add = (struct sctp_stream_reset_add_strm *)ph; 3931 num_req++; 3932 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3933 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3934 struct sctp_stream_reset_in_request *req_in; 3935 3936 num_req++; 3937 3938 req_in = (struct sctp_stream_reset_in_request *)ph; 3939 3940 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3941 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3942 struct sctp_stream_reset_tsn_request *req_tsn; 3943 3944 num_req++; 3945 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3946 3947 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3948 ret_code = 1; 3949 goto strres_nochunk; 3950 } 3951 /* no more */ 3952 break; 3953 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3954 struct sctp_stream_reset_response *resp; 3955 uint32_t result; 3956 3957 resp = (struct sctp_stream_reset_response *)ph; 3958 seq = ntohl(resp->response_seq); 3959 result = ntohl(resp->result); 3960 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3961 ret_code = 1; 3962 goto strres_nochunk; 3963 } 3964 } else { 3965 break; 3966 } 3967 offset += SCTP_SIZE32(param_len); 3968 chk_length -= SCTP_SIZE32(param_len); 3969 } 3970 if (num_req == 0) { 3971 /* we have no response free the stuff */ 3972 goto strres_nochunk; 3973 } 3974 /* ok we have a chunk to link in */ 3975 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3976 chk, 3977 sctp_next); 3978 stcb->asoc.ctrl_queue_cnt++; 3979 return (ret_code); 3980 } 3981 3982 /* 3983 * Handle a router or endpoints report of a packet loss, there are two ways 3984 * to handle this, either we get the whole packet and must disect it 3985 * ourselves (possibly with truncation and or corruption) or it is a summary 3986 * from a middle box that did the disectting for us. 3987 */ 3988 static void 3989 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3990 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3991 { 3992 uint32_t bottle_bw, on_queue; 3993 uint16_t trunc_len; 3994 unsigned int chlen; 3995 unsigned int at; 3996 struct sctp_chunk_desc desc; 3997 struct sctp_chunkhdr *ch; 3998 3999 chlen = ntohs(cp->ch.chunk_length); 4000 chlen -= sizeof(struct sctp_pktdrop_chunk); 4001 /* XXX possible chlen underflow */ 4002 if (chlen == 0) { 4003 ch = NULL; 4004 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4005 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4006 } else { 4007 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4008 chlen -= sizeof(struct sctphdr); 4009 /* XXX possible chlen underflow */ 4010 memset(&desc, 0, sizeof(desc)); 4011 } 4012 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4013 if (trunc_len > limit) { 4014 trunc_len = limit; 4015 } 4016 /* now the chunks themselves */ 4017 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4018 desc.chunk_type = ch->chunk_type; 4019 /* get amount we need to move */ 4020 at = ntohs(ch->chunk_length); 4021 if (at < sizeof(struct sctp_chunkhdr)) { 4022 /* corrupt chunk, maybe at the end? */ 4023 SCTP_STAT_INCR(sctps_pdrpcrupt); 4024 break; 4025 } 4026 if (trunc_len == 0) { 4027 /* we are supposed to have all of it */ 4028 if (at > chlen) { 4029 /* corrupt skip it */ 4030 SCTP_STAT_INCR(sctps_pdrpcrupt); 4031 break; 4032 } 4033 } else { 4034 /* is there enough of it left ? */ 4035 if (desc.chunk_type == SCTP_DATA) { 4036 if (chlen < (sizeof(struct sctp_data_chunk) + 4037 sizeof(desc.data_bytes))) { 4038 break; 4039 } 4040 } else { 4041 if (chlen < sizeof(struct sctp_chunkhdr)) { 4042 break; 4043 } 4044 } 4045 } 4046 if (desc.chunk_type == SCTP_DATA) { 4047 /* can we get out the tsn? */ 4048 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4049 SCTP_STAT_INCR(sctps_pdrpmbda); 4050 4051 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4052 /* yep */ 4053 struct sctp_data_chunk *dcp; 4054 uint8_t *ddp; 4055 unsigned int iii; 4056 4057 dcp = (struct sctp_data_chunk *)ch; 4058 ddp = (uint8_t *) (dcp + 1); 4059 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4060 desc.data_bytes[iii] = ddp[iii]; 4061 } 4062 desc.tsn_ifany = dcp->dp.tsn; 4063 } else { 4064 /* nope we are done. */ 4065 SCTP_STAT_INCR(sctps_pdrpnedat); 4066 break; 4067 } 4068 } else { 4069 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4070 SCTP_STAT_INCR(sctps_pdrpmbct); 4071 } 4072 4073 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4074 SCTP_STAT_INCR(sctps_pdrppdbrk); 4075 break; 4076 } 4077 if (SCTP_SIZE32(at) > chlen) { 4078 break; 4079 } 4080 chlen -= SCTP_SIZE32(at); 4081 if (chlen < sizeof(struct sctp_chunkhdr)) { 4082 /* done, none left */ 4083 break; 4084 } 4085 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4086 } 4087 /* Now update any rwnd --- possibly */ 4088 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4089 /* From a peer, we get a rwnd report */ 4090 uint32_t a_rwnd; 4091 4092 SCTP_STAT_INCR(sctps_pdrpfehos); 4093 4094 bottle_bw = ntohl(cp->bottle_bw); 4095 on_queue = ntohl(cp->current_onq); 4096 if (bottle_bw && on_queue) { 4097 /* a rwnd report is in here */ 4098 if (bottle_bw > on_queue) 4099 a_rwnd = bottle_bw - on_queue; 4100 else 4101 a_rwnd = 0; 4102 4103 if (a_rwnd == 0) 4104 stcb->asoc.peers_rwnd = 0; 4105 else { 4106 if (a_rwnd > stcb->asoc.total_flight) { 4107 stcb->asoc.peers_rwnd = 4108 a_rwnd - stcb->asoc.total_flight; 4109 } else { 4110 stcb->asoc.peers_rwnd = 0; 4111 } 4112 if (stcb->asoc.peers_rwnd < 4113 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4114 /* SWS sender side engages */ 4115 stcb->asoc.peers_rwnd = 0; 4116 } 4117 } 4118 } 4119 } else { 4120 SCTP_STAT_INCR(sctps_pdrpfmbox); 4121 } 4122 4123 /* now middle boxes in sat networks get a cwnd bump */ 4124 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4125 (stcb->asoc.sat_t3_loss_recovery == 0) && 4126 (stcb->asoc.sat_network)) { 4127 /* 4128 * This is debateable but for sat networks it makes sense 4129 * Note if a T3 timer has went off, we will prohibit any 4130 * changes to cwnd until we exit the t3 loss recovery. 4131 */ 4132 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4133 net, cp, &bottle_bw, &on_queue); 4134 } 4135 } 4136 4137 /* 4138 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4139 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4140 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4141 * length of the complete packet outputs: - length: modified to remaining 4142 * length after control processing - netp: modified to new sctp_nets after 4143 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4144 * bad packet,...) otherwise return the tcb for this packet 4145 */ 4146 #ifdef __GNUC__ 4147 __attribute__((noinline)) 4148 #endif 4149 static struct sctp_tcb * 4150 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4151 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4152 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4153 uint32_t vrf_id, uint16_t port) 4154 { 4155 struct sctp_association *asoc; 4156 uint32_t vtag_in; 4157 int num_chunks = 0; /* number of control chunks processed */ 4158 uint32_t chk_length; 4159 int ret; 4160 int abort_no_unlock = 0; 4161 4162 /* 4163 * How big should this be, and should it be alloc'd? Lets try the 4164 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4165 * until we get into jumbo grams and such.. 4166 */ 4167 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4168 struct sctp_tcb *locked_tcb = stcb; 4169 int got_auth = 0; 4170 uint32_t auth_offset = 0, auth_len = 0; 4171 int auth_skipped = 0; 4172 int asconf_cnt = 0; 4173 4174 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4175 struct socket *so; 4176 4177 #endif 4178 4179 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4180 iphlen, *offset, length, stcb); 4181 4182 /* validate chunk header length... */ 4183 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4184 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4185 ntohs(ch->chunk_length)); 4186 if (locked_tcb) { 4187 SCTP_TCB_UNLOCK(locked_tcb); 4188 } 4189 return (NULL); 4190 } 4191 /* 4192 * validate the verification tag 4193 */ 4194 vtag_in = ntohl(sh->v_tag); 4195 4196 if (locked_tcb) { 4197 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4198 } 4199 if (ch->chunk_type == SCTP_INITIATION) { 4200 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4201 ntohs(ch->chunk_length), vtag_in); 4202 if (vtag_in != 0) { 4203 /* protocol error- silently discard... */ 4204 SCTP_STAT_INCR(sctps_badvtag); 4205 if (locked_tcb) { 4206 SCTP_TCB_UNLOCK(locked_tcb); 4207 } 4208 return (NULL); 4209 } 4210 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4211 /* 4212 * If there is no stcb, skip the AUTH chunk and process 4213 * later after a stcb is found (to validate the lookup was 4214 * valid. 4215 */ 4216 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4217 (stcb == NULL) && 4218 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4219 /* save this chunk for later processing */ 4220 auth_skipped = 1; 4221 auth_offset = *offset; 4222 auth_len = ntohs(ch->chunk_length); 4223 4224 /* (temporarily) move past this chunk */ 4225 *offset += SCTP_SIZE32(auth_len); 4226 if (*offset >= length) { 4227 /* no more data left in the mbuf chain */ 4228 *offset = length; 4229 if (locked_tcb) { 4230 SCTP_TCB_UNLOCK(locked_tcb); 4231 } 4232 return (NULL); 4233 } 4234 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4235 sizeof(struct sctp_chunkhdr), chunk_buf); 4236 } 4237 if (ch == NULL) { 4238 /* Help */ 4239 *offset = length; 4240 if (locked_tcb) { 4241 SCTP_TCB_UNLOCK(locked_tcb); 4242 } 4243 return (NULL); 4244 } 4245 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4246 goto process_control_chunks; 4247 } 4248 /* 4249 * first check if it's an ASCONF with an unknown src addr we 4250 * need to look inside to find the association 4251 */ 4252 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4253 struct sctp_chunkhdr *asconf_ch = ch; 4254 uint32_t asconf_offset = 0, asconf_len = 0; 4255 4256 /* inp's refcount may be reduced */ 4257 SCTP_INP_INCR_REF(inp); 4258 4259 asconf_offset = *offset; 4260 do { 4261 asconf_len = ntohs(asconf_ch->chunk_length); 4262 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4263 break; 4264 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4265 *offset, sh, &inp, netp, vrf_id); 4266 if (stcb != NULL) 4267 break; 4268 asconf_offset += SCTP_SIZE32(asconf_len); 4269 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4270 sizeof(struct sctp_chunkhdr), chunk_buf); 4271 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4272 if (stcb == NULL) { 4273 /* 4274 * reduce inp's refcount if not reduced in 4275 * sctp_findassociation_ep_asconf(). 4276 */ 4277 SCTP_INP_DECR_REF(inp); 4278 } else { 4279 locked_tcb = stcb; 4280 } 4281 4282 /* now go back and verify any auth chunk to be sure */ 4283 if (auth_skipped && (stcb != NULL)) { 4284 struct sctp_auth_chunk *auth; 4285 4286 auth = (struct sctp_auth_chunk *) 4287 sctp_m_getptr(m, auth_offset, 4288 auth_len, chunk_buf); 4289 got_auth = 1; 4290 auth_skipped = 0; 4291 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4292 auth_offset)) { 4293 /* auth HMAC failed so dump it */ 4294 *offset = length; 4295 if (locked_tcb) { 4296 SCTP_TCB_UNLOCK(locked_tcb); 4297 } 4298 return (NULL); 4299 } else { 4300 /* remaining chunks are HMAC checked */ 4301 stcb->asoc.authenticated = 1; 4302 } 4303 } 4304 } 4305 if (stcb == NULL) { 4306 /* no association, so it's out of the blue... */ 4307 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4308 vrf_id, port); 4309 *offset = length; 4310 if (locked_tcb) { 4311 SCTP_TCB_UNLOCK(locked_tcb); 4312 } 4313 return (NULL); 4314 } 4315 asoc = &stcb->asoc; 4316 /* ABORT and SHUTDOWN can use either v_tag... */ 4317 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4318 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4319 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4320 if ((vtag_in == asoc->my_vtag) || 4321 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4322 (vtag_in == asoc->peer_vtag))) { 4323 /* this is valid */ 4324 } else { 4325 /* drop this packet... */ 4326 SCTP_STAT_INCR(sctps_badvtag); 4327 if (locked_tcb) { 4328 SCTP_TCB_UNLOCK(locked_tcb); 4329 } 4330 return (NULL); 4331 } 4332 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4333 if (vtag_in != asoc->my_vtag) { 4334 /* 4335 * this could be a stale SHUTDOWN-ACK or the 4336 * peer never got the SHUTDOWN-COMPLETE and 4337 * is still hung; we have started a new asoc 4338 * but it won't complete until the shutdown 4339 * is completed 4340 */ 4341 if (locked_tcb) { 4342 SCTP_TCB_UNLOCK(locked_tcb); 4343 } 4344 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4345 NULL, vrf_id, port); 4346 return (NULL); 4347 } 4348 } else { 4349 /* for all other chunks, vtag must match */ 4350 if (vtag_in != asoc->my_vtag) { 4351 /* invalid vtag... */ 4352 SCTPDBG(SCTP_DEBUG_INPUT3, 4353 "invalid vtag: %xh, expect %xh\n", 4354 vtag_in, asoc->my_vtag); 4355 SCTP_STAT_INCR(sctps_badvtag); 4356 if (locked_tcb) { 4357 SCTP_TCB_UNLOCK(locked_tcb); 4358 } 4359 *offset = length; 4360 return (NULL); 4361 } 4362 } 4363 } /* end if !SCTP_COOKIE_ECHO */ 4364 /* 4365 * process all control chunks... 4366 */ 4367 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4368 /* EY */ 4369 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4370 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4371 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4372 /* implied cookie-ack.. we must have lost the ack */ 4373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4374 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4375 stcb->asoc.overall_error_count, 4376 0, 4377 SCTP_FROM_SCTP_INPUT, 4378 __LINE__); 4379 } 4380 stcb->asoc.overall_error_count = 0; 4381 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4382 *netp); 4383 } 4384 process_control_chunks: 4385 while (IS_SCTP_CONTROL(ch)) { 4386 /* validate chunk length */ 4387 chk_length = ntohs(ch->chunk_length); 4388 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4389 ch->chunk_type, chk_length); 4390 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4391 if (chk_length < sizeof(*ch) || 4392 (*offset + (int)chk_length) > length) { 4393 *offset = length; 4394 if (locked_tcb) { 4395 SCTP_TCB_UNLOCK(locked_tcb); 4396 } 4397 return (NULL); 4398 } 4399 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4400 /* 4401 * INIT-ACK only gets the init ack "header" portion only 4402 * because we don't have to process the peer's COOKIE. All 4403 * others get a complete chunk. 4404 */ 4405 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4406 (ch->chunk_type == SCTP_INITIATION)) { 4407 /* get an init-ack chunk */ 4408 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4409 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4410 if (ch == NULL) { 4411 *offset = length; 4412 if (locked_tcb) { 4413 SCTP_TCB_UNLOCK(locked_tcb); 4414 } 4415 return (NULL); 4416 } 4417 } else { 4418 /* For cookies and all other chunks. */ 4419 if (chk_length > sizeof(chunk_buf)) { 4420 /* 4421 * use just the size of the chunk buffer so 4422 * the front part of our chunks fit in 4423 * contiguous space up to the chunk buffer 4424 * size (508 bytes). For chunks that need to 4425 * get more than that they must use the 4426 * sctp_m_getptr() function or other means 4427 * (e.g. know how to parse mbuf chains). 4428 * Cookies do this already. 4429 */ 4430 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4431 (sizeof(chunk_buf) - 4), 4432 chunk_buf); 4433 if (ch == NULL) { 4434 *offset = length; 4435 if (locked_tcb) { 4436 SCTP_TCB_UNLOCK(locked_tcb); 4437 } 4438 return (NULL); 4439 } 4440 } else { 4441 /* We can fit it all */ 4442 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4443 chk_length, chunk_buf); 4444 if (ch == NULL) { 4445 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4446 *offset = length; 4447 if (locked_tcb) { 4448 SCTP_TCB_UNLOCK(locked_tcb); 4449 } 4450 return (NULL); 4451 } 4452 } 4453 } 4454 num_chunks++; 4455 /* Save off the last place we got a control from */ 4456 if (stcb != NULL) { 4457 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4458 /* 4459 * allow last_control to be NULL if 4460 * ASCONF... ASCONF processing will find the 4461 * right net later 4462 */ 4463 if ((netp != NULL) && (*netp != NULL)) 4464 stcb->asoc.last_control_chunk_from = *netp; 4465 } 4466 } 4467 #ifdef SCTP_AUDITING_ENABLED 4468 sctp_audit_log(0xB0, ch->chunk_type); 4469 #endif 4470 4471 /* check to see if this chunk required auth, but isn't */ 4472 if ((stcb != NULL) && 4473 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4474 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4475 !stcb->asoc.authenticated) { 4476 /* "silently" ignore */ 4477 SCTP_STAT_INCR(sctps_recvauthmissing); 4478 goto next_chunk; 4479 } 4480 switch (ch->chunk_type) { 4481 case SCTP_INITIATION: 4482 /* must be first and only chunk */ 4483 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4484 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4485 /* We are not interested anymore? */ 4486 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4487 /* 4488 * collision case where we are 4489 * sending to them too 4490 */ 4491 ; 4492 } else { 4493 if (locked_tcb) { 4494 SCTP_TCB_UNLOCK(locked_tcb); 4495 } 4496 *offset = length; 4497 return (NULL); 4498 } 4499 } 4500 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4501 (num_chunks > 1) || 4502 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4503 *offset = length; 4504 if (locked_tcb) { 4505 SCTP_TCB_UNLOCK(locked_tcb); 4506 } 4507 return (NULL); 4508 } 4509 if ((stcb != NULL) && 4510 (SCTP_GET_STATE(&stcb->asoc) == 4511 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4512 sctp_send_shutdown_ack(stcb, 4513 stcb->asoc.primary_destination); 4514 *offset = length; 4515 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4516 if (locked_tcb) { 4517 SCTP_TCB_UNLOCK(locked_tcb); 4518 } 4519 return (NULL); 4520 } 4521 if (netp) { 4522 sctp_handle_init(m, iphlen, *offset, sh, 4523 (struct sctp_init_chunk *)ch, inp, 4524 stcb, *netp, &abort_no_unlock, vrf_id, port); 4525 } 4526 if (abort_no_unlock) 4527 return (NULL); 4528 4529 *offset = length; 4530 if (locked_tcb) { 4531 SCTP_TCB_UNLOCK(locked_tcb); 4532 } 4533 return (NULL); 4534 break; 4535 case SCTP_PAD_CHUNK: 4536 break; 4537 case SCTP_INITIATION_ACK: 4538 /* must be first and only chunk */ 4539 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4540 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4541 /* We are not interested anymore */ 4542 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4543 ; 4544 } else { 4545 if (locked_tcb) { 4546 SCTP_TCB_UNLOCK(locked_tcb); 4547 } 4548 *offset = length; 4549 if (stcb) { 4550 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4551 so = SCTP_INP_SO(inp); 4552 atomic_add_int(&stcb->asoc.refcnt, 1); 4553 SCTP_TCB_UNLOCK(stcb); 4554 SCTP_SOCKET_LOCK(so, 1); 4555 SCTP_TCB_LOCK(stcb); 4556 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4557 #endif 4558 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4559 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4560 SCTP_SOCKET_UNLOCK(so, 1); 4561 #endif 4562 } 4563 return (NULL); 4564 } 4565 } 4566 if ((num_chunks > 1) || 4567 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4568 *offset = length; 4569 if (locked_tcb) { 4570 SCTP_TCB_UNLOCK(locked_tcb); 4571 } 4572 return (NULL); 4573 } 4574 if ((netp) && (*netp)) { 4575 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4576 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4577 } else { 4578 ret = -1; 4579 } 4580 /* 4581 * Special case, I must call the output routine to 4582 * get the cookie echoed 4583 */ 4584 if (abort_no_unlock) 4585 return (NULL); 4586 4587 if ((stcb) && ret == 0) 4588 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4589 *offset = length; 4590 if (locked_tcb) { 4591 SCTP_TCB_UNLOCK(locked_tcb); 4592 } 4593 return (NULL); 4594 break; 4595 case SCTP_SELECTIVE_ACK: 4596 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4597 SCTP_STAT_INCR(sctps_recvsacks); 4598 { 4599 struct sctp_sack_chunk *sack; 4600 int abort_now = 0; 4601 uint32_t a_rwnd, cum_ack; 4602 uint16_t num_seg; 4603 int nonce_sum_flag; 4604 4605 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) { 4606 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n"); 4607 *offset = length; 4608 if (locked_tcb) { 4609 SCTP_TCB_UNLOCK(locked_tcb); 4610 } 4611 return (NULL); 4612 } 4613 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4614 /*- 4615 * If we have sent a shutdown-ack, we will pay no 4616 * attention to a sack sent in to us since 4617 * we don't care anymore. 4618 */ 4619 break; 4620 } 4621 sack = (struct sctp_sack_chunk *)ch; 4622 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4623 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4624 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4625 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4626 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4627 cum_ack, 4628 num_seg, 4629 a_rwnd 4630 ); 4631 stcb->asoc.seen_a_sack_this_pkt = 1; 4632 if ((stcb->asoc.pr_sctp_cnt == 0) && 4633 (num_seg == 0) && 4634 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4635 (cum_ack == stcb->asoc.last_acked_seq)) && 4636 (stcb->asoc.saw_sack_with_frags == 0) && 4637 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4638 ) { 4639 /* 4640 * We have a SIMPLE sack having no 4641 * prior segments and data on sent 4642 * queue to be acked.. Use the 4643 * faster path sack processing. We 4644 * also allow window update sacks 4645 * with no missing segments to go 4646 * this way too. 4647 */ 4648 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4649 &abort_now); 4650 } else { 4651 if (netp && *netp) 4652 sctp_handle_sack(m, *offset, 4653 sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4654 } 4655 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4656 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4657 (stcb->asoc.stream_queue_cnt == 0)) { 4658 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4659 } 4660 if (abort_now) { 4661 /* ABORT signal from sack processing */ 4662 *offset = length; 4663 return (NULL); 4664 } 4665 } 4666 break; 4667 /* 4668 * EY - nr_sack: If the received chunk is an 4669 * nr_sack chunk 4670 */ 4671 case SCTP_NR_SELECTIVE_ACK: 4672 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4673 SCTP_STAT_INCR(sctps_recvsacks); 4674 { 4675 struct sctp_nr_sack_chunk *nr_sack; 4676 int abort_now = 0; 4677 uint32_t a_rwnd, cum_ack; 4678 uint16_t num_seg, num_nr_seg; 4679 int nonce_sum_flag; 4680 4681 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_nr_sack_chunk))) { 4682 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on nr_sack chunk, too small\n"); 4683 ignore_nr_sack: 4684 *offset = length; 4685 if (locked_tcb) { 4686 SCTP_TCB_UNLOCK(locked_tcb); 4687 } 4688 return (NULL); 4689 } 4690 /* 4691 * EY nr_sacks have not been negotiated but 4692 * the peer end sent an nr_sack, silently 4693 * discard the chunk 4694 */ 4695 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack)) { 4696 goto unknown_chunk; 4697 } 4698 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4699 /*- 4700 * If we have sent a shutdown-ack, we will pay no 4701 * attention to a sack sent in to us since 4702 * we don't care anymore. 4703 */ 4704 goto ignore_nr_sack; 4705 } 4706 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4707 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4708 4709 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4710 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4711 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4712 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4713 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4714 cum_ack, 4715 num_seg, 4716 a_rwnd 4717 ); 4718 stcb->asoc.seen_a_sack_this_pkt = 1; 4719 if ((stcb->asoc.pr_sctp_cnt == 0) && 4720 (num_seg == 0) && 4721 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4722 (cum_ack == stcb->asoc.last_acked_seq)) && 4723 (stcb->asoc.saw_sack_with_frags == 0) && 4724 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4725 ) { 4726 /* 4727 * We have a SIMPLE sack having no 4728 * prior segments and data on sent 4729 * queue to be acked.. Use the 4730 * faster path sack processing. We 4731 * also allow window update sacks 4732 * with no missing segments to go 4733 * this way too. 4734 */ 4735 sctp_express_handle_nr_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4736 &abort_now); 4737 } else { 4738 if (netp && *netp) 4739 sctp_handle_nr_sack(m, *offset, 4740 nr_sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4741 } 4742 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4743 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4744 (stcb->asoc.stream_queue_cnt == 0)) { 4745 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4746 } 4747 if (abort_now) { 4748 /* ABORT signal from sack processing */ 4749 *offset = length; 4750 return (NULL); 4751 } 4752 } 4753 break; 4754 4755 case SCTP_HEARTBEAT_REQUEST: 4756 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4757 if ((stcb) && netp && *netp) { 4758 SCTP_STAT_INCR(sctps_recvheartbeat); 4759 sctp_send_heartbeat_ack(stcb, m, *offset, 4760 chk_length, *netp); 4761 4762 /* He's alive so give him credit */ 4763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4764 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4765 stcb->asoc.overall_error_count, 4766 0, 4767 SCTP_FROM_SCTP_INPUT, 4768 __LINE__); 4769 } 4770 stcb->asoc.overall_error_count = 0; 4771 } 4772 break; 4773 case SCTP_HEARTBEAT_ACK: 4774 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4775 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4776 /* Its not ours */ 4777 *offset = length; 4778 if (locked_tcb) { 4779 SCTP_TCB_UNLOCK(locked_tcb); 4780 } 4781 return (NULL); 4782 } 4783 /* He's alive so give him credit */ 4784 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4785 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4786 stcb->asoc.overall_error_count, 4787 0, 4788 SCTP_FROM_SCTP_INPUT, 4789 __LINE__); 4790 } 4791 stcb->asoc.overall_error_count = 0; 4792 SCTP_STAT_INCR(sctps_recvheartbeatack); 4793 if (netp && *netp) 4794 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4795 stcb, *netp); 4796 break; 4797 case SCTP_ABORT_ASSOCIATION: 4798 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4799 stcb); 4800 if ((stcb) && netp && *netp) 4801 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4802 stcb, *netp); 4803 *offset = length; 4804 return (NULL); 4805 break; 4806 case SCTP_SHUTDOWN: 4807 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4808 stcb); 4809 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4810 *offset = length; 4811 if (locked_tcb) { 4812 SCTP_TCB_UNLOCK(locked_tcb); 4813 } 4814 return (NULL); 4815 } 4816 if (netp && *netp) { 4817 int abort_flag = 0; 4818 4819 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4820 stcb, *netp, &abort_flag); 4821 if (abort_flag) { 4822 *offset = length; 4823 return (NULL); 4824 } 4825 } 4826 break; 4827 case SCTP_SHUTDOWN_ACK: 4828 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4829 if ((stcb) && (netp) && (*netp)) 4830 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4831 *offset = length; 4832 return (NULL); 4833 break; 4834 4835 case SCTP_OPERATION_ERROR: 4836 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4837 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4838 4839 *offset = length; 4840 return (NULL); 4841 } 4842 break; 4843 case SCTP_COOKIE_ECHO: 4844 SCTPDBG(SCTP_DEBUG_INPUT3, 4845 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4846 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4847 ; 4848 } else { 4849 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4850 /* We are not interested anymore */ 4851 *offset = length; 4852 return (NULL); 4853 } 4854 } 4855 /* 4856 * First are we accepting? We do this again here 4857 * sincen it is possible that a previous endpoint 4858 * WAS listening responded to a INIT-ACK and then 4859 * closed. We opened and bound.. and are now no 4860 * longer listening. 4861 */ 4862 4863 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4864 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4865 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4866 struct mbuf *oper; 4867 struct sctp_paramhdr *phdr; 4868 4869 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4870 0, M_DONTWAIT, 1, MT_DATA); 4871 if (oper) { 4872 SCTP_BUF_LEN(oper) = 4873 sizeof(struct sctp_paramhdr); 4874 phdr = mtod(oper, 4875 struct sctp_paramhdr *); 4876 phdr->param_type = 4877 htons(SCTP_CAUSE_OUT_OF_RESC); 4878 phdr->param_length = 4879 htons(sizeof(struct sctp_paramhdr)); 4880 } 4881 sctp_abort_association(inp, stcb, m, 4882 iphlen, sh, oper, vrf_id, port); 4883 } 4884 *offset = length; 4885 return (NULL); 4886 } else { 4887 struct mbuf *ret_buf; 4888 struct sctp_inpcb *linp; 4889 4890 if (stcb) { 4891 linp = NULL; 4892 } else { 4893 linp = inp; 4894 } 4895 4896 if (linp) { 4897 SCTP_ASOC_CREATE_LOCK(linp); 4898 } 4899 if (netp) { 4900 ret_buf = 4901 sctp_handle_cookie_echo(m, iphlen, 4902 *offset, sh, 4903 (struct sctp_cookie_echo_chunk *)ch, 4904 &inp, &stcb, netp, 4905 auth_skipped, 4906 auth_offset, 4907 auth_len, 4908 &locked_tcb, 4909 vrf_id, 4910 port); 4911 } else { 4912 ret_buf = NULL; 4913 } 4914 if (linp) { 4915 SCTP_ASOC_CREATE_UNLOCK(linp); 4916 } 4917 if (ret_buf == NULL) { 4918 if (locked_tcb) { 4919 SCTP_TCB_UNLOCK(locked_tcb); 4920 } 4921 SCTPDBG(SCTP_DEBUG_INPUT3, 4922 "GAK, null buffer\n"); 4923 auth_skipped = 0; 4924 *offset = length; 4925 return (NULL); 4926 } 4927 /* if AUTH skipped, see if it verified... */ 4928 if (auth_skipped) { 4929 got_auth = 1; 4930 auth_skipped = 0; 4931 } 4932 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4933 /* 4934 * Restart the timer if we have 4935 * pending data 4936 */ 4937 struct sctp_tmit_chunk *chk; 4938 4939 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4940 if (chk) { 4941 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4942 stcb->sctp_ep, stcb, 4943 chk->whoTo); 4944 } 4945 } 4946 } 4947 break; 4948 case SCTP_COOKIE_ACK: 4949 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4950 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4951 if (locked_tcb) { 4952 SCTP_TCB_UNLOCK(locked_tcb); 4953 } 4954 return (NULL); 4955 } 4956 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4957 /* We are not interested anymore */ 4958 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4959 ; 4960 } else if (stcb) { 4961 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4962 so = SCTP_INP_SO(inp); 4963 atomic_add_int(&stcb->asoc.refcnt, 1); 4964 SCTP_TCB_UNLOCK(stcb); 4965 SCTP_SOCKET_LOCK(so, 1); 4966 SCTP_TCB_LOCK(stcb); 4967 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4968 #endif 4969 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4970 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4971 SCTP_SOCKET_UNLOCK(so, 1); 4972 #endif 4973 *offset = length; 4974 return (NULL); 4975 } 4976 } 4977 /* He's alive so give him credit */ 4978 if ((stcb) && netp && *netp) { 4979 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4980 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4981 stcb->asoc.overall_error_count, 4982 0, 4983 SCTP_FROM_SCTP_INPUT, 4984 __LINE__); 4985 } 4986 stcb->asoc.overall_error_count = 0; 4987 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4988 } 4989 break; 4990 case SCTP_ECN_ECHO: 4991 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4992 /* He's alive so give him credit */ 4993 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4994 /* Its not ours */ 4995 if (locked_tcb) { 4996 SCTP_TCB_UNLOCK(locked_tcb); 4997 } 4998 *offset = length; 4999 return (NULL); 5000 } 5001 if (stcb) { 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_ecn_echo((struct sctp_ecne_chunk *)ch, 5011 stcb); 5012 } 5013 break; 5014 case SCTP_ECN_CWR: 5015 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5016 /* He's alive so give him credit */ 5017 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5018 /* Its not ours */ 5019 if (locked_tcb) { 5020 SCTP_TCB_UNLOCK(locked_tcb); 5021 } 5022 *offset = length; 5023 return (NULL); 5024 } 5025 if (stcb) { 5026 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5027 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5028 stcb->asoc.overall_error_count, 5029 0, 5030 SCTP_FROM_SCTP_INPUT, 5031 __LINE__); 5032 } 5033 stcb->asoc.overall_error_count = 0; 5034 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5035 } 5036 break; 5037 case SCTP_SHUTDOWN_COMPLETE: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5039 /* must be first and only chunk */ 5040 if ((num_chunks > 1) || 5041 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5042 *offset = length; 5043 if (locked_tcb) { 5044 SCTP_TCB_UNLOCK(locked_tcb); 5045 } 5046 return (NULL); 5047 } 5048 if ((stcb) && netp && *netp) { 5049 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5050 stcb, *netp); 5051 } 5052 *offset = length; 5053 return (NULL); 5054 break; 5055 case SCTP_ASCONF: 5056 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5057 /* He's alive so give him credit */ 5058 if (stcb) { 5059 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5060 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5061 stcb->asoc.overall_error_count, 5062 0, 5063 SCTP_FROM_SCTP_INPUT, 5064 __LINE__); 5065 } 5066 stcb->asoc.overall_error_count = 0; 5067 sctp_handle_asconf(m, *offset, 5068 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5069 asconf_cnt++; 5070 } 5071 break; 5072 case SCTP_ASCONF_ACK: 5073 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5074 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5075 /* Its not ours */ 5076 if (locked_tcb) { 5077 SCTP_TCB_UNLOCK(locked_tcb); 5078 } 5079 *offset = length; 5080 return (NULL); 5081 } 5082 if ((stcb) && netp && *netp) { 5083 /* He's alive so give him credit */ 5084 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5085 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5086 stcb->asoc.overall_error_count, 5087 0, 5088 SCTP_FROM_SCTP_INPUT, 5089 __LINE__); 5090 } 5091 stcb->asoc.overall_error_count = 0; 5092 sctp_handle_asconf_ack(m, *offset, 5093 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5094 if (abort_no_unlock) 5095 return (NULL); 5096 } 5097 break; 5098 case SCTP_FORWARD_CUM_TSN: 5099 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5100 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5101 /* Its not ours */ 5102 if (locked_tcb) { 5103 SCTP_TCB_UNLOCK(locked_tcb); 5104 } 5105 *offset = length; 5106 return (NULL); 5107 } 5108 /* He's alive so give him credit */ 5109 if (stcb) { 5110 int abort_flag = 0; 5111 5112 stcb->asoc.overall_error_count = 0; 5113 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5114 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5115 stcb->asoc.overall_error_count, 5116 0, 5117 SCTP_FROM_SCTP_INPUT, 5118 __LINE__); 5119 } 5120 *fwd_tsn_seen = 1; 5121 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5122 /* We are not interested anymore */ 5123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5124 so = SCTP_INP_SO(inp); 5125 atomic_add_int(&stcb->asoc.refcnt, 1); 5126 SCTP_TCB_UNLOCK(stcb); 5127 SCTP_SOCKET_LOCK(so, 1); 5128 SCTP_TCB_LOCK(stcb); 5129 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5130 #endif 5131 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5132 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5133 SCTP_SOCKET_UNLOCK(so, 1); 5134 #endif 5135 *offset = length; 5136 return (NULL); 5137 } 5138 sctp_handle_forward_tsn(stcb, 5139 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5140 if (abort_flag) { 5141 *offset = length; 5142 return (NULL); 5143 } else { 5144 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5145 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5146 stcb->asoc.overall_error_count, 5147 0, 5148 SCTP_FROM_SCTP_INPUT, 5149 __LINE__); 5150 } 5151 stcb->asoc.overall_error_count = 0; 5152 } 5153 5154 } 5155 break; 5156 case SCTP_STREAM_RESET: 5157 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5158 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5159 /* Its not ours */ 5160 if (locked_tcb) { 5161 SCTP_TCB_UNLOCK(locked_tcb); 5162 } 5163 *offset = length; 5164 return (NULL); 5165 } 5166 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5167 /* We are not interested anymore */ 5168 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5169 so = SCTP_INP_SO(inp); 5170 atomic_add_int(&stcb->asoc.refcnt, 1); 5171 SCTP_TCB_UNLOCK(stcb); 5172 SCTP_SOCKET_LOCK(so, 1); 5173 SCTP_TCB_LOCK(stcb); 5174 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5175 #endif 5176 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5177 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5178 SCTP_SOCKET_UNLOCK(so, 1); 5179 #endif 5180 *offset = length; 5181 return (NULL); 5182 } 5183 if (stcb->asoc.peer_supports_strreset == 0) { 5184 /* 5185 * hmm, peer should have announced this, but 5186 * we will turn it on since he is sending us 5187 * a stream reset. 5188 */ 5189 stcb->asoc.peer_supports_strreset = 1; 5190 } 5191 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5192 /* stop processing */ 5193 *offset = length; 5194 return (NULL); 5195 } 5196 break; 5197 case SCTP_PACKET_DROPPED: 5198 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5199 /* re-get it all please */ 5200 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5201 /* Its not ours */ 5202 if (locked_tcb) { 5203 SCTP_TCB_UNLOCK(locked_tcb); 5204 } 5205 *offset = length; 5206 return (NULL); 5207 } 5208 if (ch && (stcb) && netp && (*netp)) { 5209 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5210 stcb, *netp, 5211 min(chk_length, (sizeof(chunk_buf) - 4))); 5212 5213 } 5214 break; 5215 5216 case SCTP_AUTHENTICATION: 5217 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5218 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5219 goto unknown_chunk; 5220 5221 if (stcb == NULL) { 5222 /* save the first AUTH for later processing */ 5223 if (auth_skipped == 0) { 5224 auth_offset = *offset; 5225 auth_len = chk_length; 5226 auth_skipped = 1; 5227 } 5228 /* skip this chunk (temporarily) */ 5229 goto next_chunk; 5230 } 5231 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5232 (chk_length > (sizeof(struct sctp_auth_chunk) + 5233 SCTP_AUTH_DIGEST_LEN_MAX))) { 5234 /* Its not ours */ 5235 if (locked_tcb) { 5236 SCTP_TCB_UNLOCK(locked_tcb); 5237 } 5238 *offset = length; 5239 return (NULL); 5240 } 5241 if (got_auth == 1) { 5242 /* skip this chunk... it's already auth'd */ 5243 goto next_chunk; 5244 } 5245 got_auth = 1; 5246 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5247 m, *offset)) { 5248 /* auth HMAC failed so dump the packet */ 5249 *offset = length; 5250 return (stcb); 5251 } else { 5252 /* remaining chunks are HMAC checked */ 5253 stcb->asoc.authenticated = 1; 5254 } 5255 break; 5256 5257 default: 5258 unknown_chunk: 5259 /* it's an unknown chunk! */ 5260 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5261 struct mbuf *mm; 5262 struct sctp_paramhdr *phd; 5263 5264 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5265 0, M_DONTWAIT, 1, MT_DATA); 5266 if (mm) { 5267 phd = mtod(mm, struct sctp_paramhdr *); 5268 /* 5269 * We cheat and use param type since 5270 * we did not bother to define a 5271 * error cause struct. They are the 5272 * same basic format with different 5273 * names. 5274 */ 5275 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5276 phd->param_length = htons(chk_length + sizeof(*phd)); 5277 SCTP_BUF_LEN(mm) = sizeof(*phd); 5278 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5279 M_DONTWAIT); 5280 if (SCTP_BUF_NEXT(mm)) { 5281 #ifdef SCTP_MBUF_LOGGING 5282 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5283 struct mbuf *mat; 5284 5285 mat = SCTP_BUF_NEXT(mm); 5286 while (mat) { 5287 if (SCTP_BUF_IS_EXTENDED(mat)) { 5288 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5289 } 5290 mat = SCTP_BUF_NEXT(mat); 5291 } 5292 } 5293 #endif 5294 sctp_queue_op_err(stcb, mm); 5295 } else { 5296 sctp_m_freem(mm); 5297 } 5298 } 5299 } 5300 if ((ch->chunk_type & 0x80) == 0) { 5301 /* discard this packet */ 5302 *offset = length; 5303 return (stcb); 5304 } /* else skip this bad chunk and continue... */ 5305 break; 5306 } /* switch (ch->chunk_type) */ 5307 5308 5309 next_chunk: 5310 /* get the next chunk */ 5311 *offset += SCTP_SIZE32(chk_length); 5312 if (*offset >= length) { 5313 /* no more data left in the mbuf chain */ 5314 break; 5315 } 5316 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5317 sizeof(struct sctp_chunkhdr), chunk_buf); 5318 if (ch == NULL) { 5319 if (locked_tcb) { 5320 SCTP_TCB_UNLOCK(locked_tcb); 5321 } 5322 *offset = length; 5323 return (NULL); 5324 } 5325 } /* while */ 5326 5327 if (asconf_cnt > 0 && stcb != NULL) { 5328 sctp_send_asconf_ack(stcb); 5329 } 5330 return (stcb); 5331 } 5332 5333 5334 /* 5335 * Process the ECN bits we have something set so we must look to see if it is 5336 * ECN(0) or ECN(1) or CE 5337 */ 5338 static void 5339 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5340 uint8_t ecn_bits) 5341 { 5342 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5343 ; 5344 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5345 /* 5346 * we only add to the nonce sum for ECT1, ECT0 does not 5347 * change the NS bit (that we have yet to find a way to send 5348 * it yet). 5349 */ 5350 5351 /* ECN Nonce stuff */ 5352 stcb->asoc.receiver_nonce_sum++; 5353 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5354 5355 /* 5356 * Drag up the last_echo point if cumack is larger since we 5357 * don't want the point falling way behind by more than 5358 * 2^^31 and then having it be incorrect. 5359 */ 5360 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5361 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5362 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5363 } 5364 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5365 /* 5366 * Drag up the last_echo point if cumack is larger since we 5367 * don't want the point falling way behind by more than 5368 * 2^^31 and then having it be incorrect. 5369 */ 5370 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5371 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5372 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5373 } 5374 } 5375 } 5376 5377 static void 5378 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5379 uint32_t high_tsn, uint8_t ecn_bits) 5380 { 5381 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5382 /* 5383 * we possibly must notify the sender that a congestion 5384 * window reduction is in order. We do this by adding a ECNE 5385 * chunk to the output chunk queue. The incoming CWR will 5386 * remove this chunk. 5387 */ 5388 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5389 MAX_TSN)) { 5390 /* Yep, we need to add a ECNE */ 5391 sctp_send_ecn_echo(stcb, net, high_tsn); 5392 stcb->asoc.last_echo_tsn = high_tsn; 5393 } 5394 } 5395 } 5396 5397 #ifdef INVARIANTS 5398 static void 5399 sctp_validate_no_locks(struct sctp_inpcb *inp) 5400 { 5401 struct sctp_tcb *stcb; 5402 5403 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 5404 if (mtx_owned(&stcb->tcb_mtx)) { 5405 panic("Own lock on stcb at return from input"); 5406 } 5407 } 5408 } 5409 5410 #endif 5411 5412 /* 5413 * common input chunk processing (v4 and v6) 5414 */ 5415 void 5416 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5417 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5418 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5419 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5420 { 5421 /* 5422 * Control chunk processing 5423 */ 5424 uint32_t high_tsn; 5425 int fwd_tsn_seen = 0, data_processed = 0; 5426 struct mbuf *m = *mm; 5427 int abort_flag = 0; 5428 int un_sent; 5429 5430 SCTP_STAT_INCR(sctps_recvdatagrams); 5431 #ifdef SCTP_AUDITING_ENABLED 5432 sctp_audit_log(0xE0, 1); 5433 sctp_auditing(0, inp, stcb, net); 5434 #endif 5435 5436 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5437 m, iphlen, offset, length, stcb); 5438 if (stcb) { 5439 /* always clear this before beginning a packet */ 5440 stcb->asoc.authenticated = 0; 5441 stcb->asoc.seen_a_sack_this_pkt = 0; 5442 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5443 stcb, stcb->asoc.state); 5444 5445 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5446 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5447 /*- 5448 * If we hit here, we had a ref count 5449 * up when the assoc was aborted and the 5450 * timer is clearing out the assoc, we should 5451 * NOT respond to any packet.. its OOTB. 5452 */ 5453 SCTP_TCB_UNLOCK(stcb); 5454 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5455 vrf_id, port); 5456 goto out_now; 5457 } 5458 } 5459 if (IS_SCTP_CONTROL(ch)) { 5460 /* process the control portion of the SCTP packet */ 5461 /* sa_ignore NO_NULL_CHK */ 5462 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5463 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5464 if (stcb) { 5465 /* 5466 * This covers us if the cookie-echo was there and 5467 * it changes our INP. 5468 */ 5469 inp = stcb->sctp_ep; 5470 if ((net) && (port)) { 5471 if (net->port == 0) { 5472 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5473 } 5474 net->port = port; 5475 } 5476 } 5477 } else { 5478 /* 5479 * no control chunks, so pre-process DATA chunks (these 5480 * checks are taken care of by control processing) 5481 */ 5482 5483 /* 5484 * if DATA only packet, and auth is required, then punt... 5485 * can't have authenticated without any AUTH (control) 5486 * chunks 5487 */ 5488 if ((stcb != NULL) && 5489 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5490 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5491 /* "silently" ignore */ 5492 SCTP_STAT_INCR(sctps_recvauthmissing); 5493 SCTP_TCB_UNLOCK(stcb); 5494 goto out_now; 5495 } 5496 if (stcb == NULL) { 5497 /* out of the blue DATA chunk */ 5498 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5499 vrf_id, port); 5500 goto out_now; 5501 } 5502 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5503 /* v_tag mismatch! */ 5504 SCTP_STAT_INCR(sctps_badvtag); 5505 SCTP_TCB_UNLOCK(stcb); 5506 goto out_now; 5507 } 5508 } 5509 5510 if (stcb == NULL) { 5511 /* 5512 * no valid TCB for this packet, or we found it's a bad 5513 * packet while processing control, or we're done with this 5514 * packet (done or skip rest of data), so we drop it... 5515 */ 5516 goto out_now; 5517 } 5518 /* 5519 * DATA chunk processing 5520 */ 5521 /* plow through the data chunks while length > offset */ 5522 5523 /* 5524 * Rest should be DATA only. Check authentication state if AUTH for 5525 * DATA is required. 5526 */ 5527 if ((length > offset) && 5528 (stcb != NULL) && 5529 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5530 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5531 !stcb->asoc.authenticated) { 5532 /* "silently" ignore */ 5533 SCTP_STAT_INCR(sctps_recvauthmissing); 5534 SCTPDBG(SCTP_DEBUG_AUTH1, 5535 "Data chunk requires AUTH, skipped\n"); 5536 goto trigger_send; 5537 } 5538 if (length > offset) { 5539 int retval; 5540 5541 /* 5542 * First check to make sure our state is correct. We would 5543 * not get here unless we really did have a tag, so we don't 5544 * abort if this happens, just dump the chunk silently. 5545 */ 5546 switch (SCTP_GET_STATE(&stcb->asoc)) { 5547 case SCTP_STATE_COOKIE_ECHOED: 5548 /* 5549 * we consider data with valid tags in this state 5550 * shows us the cookie-ack was lost. Imply it was 5551 * there. 5552 */ 5553 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5554 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5555 stcb->asoc.overall_error_count, 5556 0, 5557 SCTP_FROM_SCTP_INPUT, 5558 __LINE__); 5559 } 5560 stcb->asoc.overall_error_count = 0; 5561 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5562 break; 5563 case SCTP_STATE_COOKIE_WAIT: 5564 /* 5565 * We consider OOTB any data sent during asoc setup. 5566 */ 5567 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5568 vrf_id, port); 5569 SCTP_TCB_UNLOCK(stcb); 5570 goto out_now; 5571 /* sa_ignore NOTREACHED */ 5572 break; 5573 case SCTP_STATE_EMPTY: /* should not happen */ 5574 case SCTP_STATE_INUSE: /* should not happen */ 5575 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5576 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5577 default: 5578 SCTP_TCB_UNLOCK(stcb); 5579 goto out_now; 5580 /* sa_ignore NOTREACHED */ 5581 break; 5582 case SCTP_STATE_OPEN: 5583 case SCTP_STATE_SHUTDOWN_SENT: 5584 break; 5585 } 5586 /* take care of ECN, part 1. */ 5587 if (stcb->asoc.ecn_allowed && 5588 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5589 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5590 } 5591 /* plow through the data chunks while length > offset */ 5592 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5593 inp, stcb, net, &high_tsn); 5594 if (retval == 2) { 5595 /* 5596 * The association aborted, NO UNLOCK needed since 5597 * the association is destroyed. 5598 */ 5599 goto out_now; 5600 } 5601 data_processed = 1; 5602 if (retval == 0) { 5603 /* take care of ecn part 2. */ 5604 if (stcb->asoc.ecn_allowed && 5605 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5606 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5607 ecn_bits); 5608 } 5609 } 5610 /* 5611 * Anything important needs to have been m_copy'ed in 5612 * process_data 5613 */ 5614 } 5615 if ((data_processed == 0) && (fwd_tsn_seen)) { 5616 int was_a_gap = 0; 5617 5618 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5619 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5620 /* there was a gap before this data was processed */ 5621 was_a_gap = 1; 5622 } 5623 stcb->asoc.send_sack = 1; 5624 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 5625 if (abort_flag) { 5626 /* Again, we aborted so NO UNLOCK needed */ 5627 goto out_now; 5628 } 5629 } else if (fwd_tsn_seen) { 5630 stcb->asoc.send_sack = 1; 5631 } 5632 /* trigger send of any chunks in queue... */ 5633 trigger_send: 5634 #ifdef SCTP_AUDITING_ENABLED 5635 sctp_audit_log(0xE0, 2); 5636 sctp_auditing(1, inp, stcb, net); 5637 #endif 5638 SCTPDBG(SCTP_DEBUG_INPUT1, 5639 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5640 stcb->asoc.peers_rwnd, 5641 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5642 stcb->asoc.total_flight); 5643 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5644 5645 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5646 ((un_sent) && 5647 (stcb->asoc.peers_rwnd > 0 || 5648 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5649 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5650 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5651 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5652 } 5653 #ifdef SCTP_AUDITING_ENABLED 5654 sctp_audit_log(0xE0, 3); 5655 sctp_auditing(2, inp, stcb, net); 5656 #endif 5657 SCTP_TCB_UNLOCK(stcb); 5658 out_now: 5659 #ifdef INVARIANTS 5660 sctp_validate_no_locks(inp); 5661 #endif 5662 return; 5663 } 5664 5665 #if 0 5666 static void 5667 sctp_print_mbuf_chain(struct mbuf *m) 5668 { 5669 for (; m; m = SCTP_BUF_NEXT(m)) { 5670 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5671 if (SCTP_BUF_IS_EXTENDED(m)) 5672 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5673 } 5674 } 5675 5676 #endif 5677 5678 void 5679 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5680 { 5681 #ifdef SCTP_MBUF_LOGGING 5682 struct mbuf *mat; 5683 5684 #endif 5685 struct mbuf *m; 5686 int iphlen; 5687 uint32_t vrf_id = 0; 5688 uint8_t ecn_bits; 5689 struct ip *ip; 5690 struct sctphdr *sh; 5691 struct sctp_inpcb *inp = NULL; 5692 5693 uint32_t check, calc_check; 5694 struct sctp_nets *net; 5695 struct sctp_tcb *stcb = NULL; 5696 struct sctp_chunkhdr *ch; 5697 int refcount_up = 0; 5698 int length, mlen, offset; 5699 5700 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5701 SCTP_RELEASE_PKT(i_pak); 5702 return; 5703 } 5704 mlen = SCTP_HEADER_LEN(i_pak); 5705 iphlen = off; 5706 m = SCTP_HEADER_TO_CHAIN(i_pak); 5707 5708 net = NULL; 5709 SCTP_STAT_INCR(sctps_recvpackets); 5710 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5711 5712 5713 #ifdef SCTP_MBUF_LOGGING 5714 /* Log in any input mbufs */ 5715 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5716 mat = m; 5717 while (mat) { 5718 if (SCTP_BUF_IS_EXTENDED(mat)) { 5719 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5720 } 5721 mat = SCTP_BUF_NEXT(mat); 5722 } 5723 } 5724 #endif 5725 #ifdef SCTP_PACKET_LOGGING 5726 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5727 sctp_packet_log(m, mlen); 5728 #endif 5729 /* 5730 * Must take out the iphlen, since mlen expects this (only effect lb 5731 * case) 5732 */ 5733 mlen -= iphlen; 5734 5735 /* 5736 * Get IP, SCTP, and first chunk header together in first mbuf. 5737 */ 5738 ip = mtod(m, struct ip *); 5739 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5740 if (SCTP_BUF_LEN(m) < offset) { 5741 if ((m = m_pullup(m, offset)) == 0) { 5742 SCTP_STAT_INCR(sctps_hdrops); 5743 return; 5744 } 5745 ip = mtod(m, struct ip *); 5746 } 5747 /* validate mbuf chain length with IP payload length */ 5748 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5749 SCTP_STAT_INCR(sctps_hdrops); 5750 goto bad; 5751 } 5752 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5753 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5754 SCTPDBG(SCTP_DEBUG_INPUT1, 5755 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5756 5757 /* SCTP does not allow broadcasts or multicasts */ 5758 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5759 goto bad; 5760 } 5761 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5762 /* 5763 * We only look at broadcast if its a front state, All 5764 * others we will not have a tcb for anyway. 5765 */ 5766 goto bad; 5767 } 5768 /* validate SCTP checksum */ 5769 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5770 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5771 m->m_pkthdr.len, 5772 if_name(m->m_pkthdr.rcvif), 5773 m->m_pkthdr.csum_flags); 5774 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5775 SCTP_STAT_INCR(sctps_recvhwcrc); 5776 goto sctp_skip_csum_4; 5777 } 5778 check = sh->checksum; /* save incoming checksum */ 5779 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5780 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5781 (SCTP_IS_IT_LOOPBACK(m))) 5782 ) { 5783 SCTP_STAT_INCR(sctps_recvnocrc); 5784 goto sctp_skip_csum_4; 5785 } 5786 sh->checksum = 0; /* prepare for calc */ 5787 calc_check = sctp_calculate_cksum(m, iphlen); 5788 SCTP_STAT_INCR(sctps_recvswcrc); 5789 if (calc_check != check) { 5790 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5791 calc_check, check, m, mlen, iphlen); 5792 5793 stcb = sctp_findassociation_addr(m, iphlen, 5794 offset - sizeof(*ch), 5795 sh, ch, &inp, &net, 5796 vrf_id); 5797 if ((net) && (port)) { 5798 if (net->port == 0) { 5799 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5800 } 5801 net->port = port; 5802 } 5803 if ((inp) && (stcb)) { 5804 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5805 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5806 } else if ((inp != NULL) && (stcb == NULL)) { 5807 refcount_up = 1; 5808 } 5809 SCTP_STAT_INCR(sctps_badsum); 5810 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5811 goto bad; 5812 } 5813 sh->checksum = calc_check; 5814 sctp_skip_csum_4: 5815 /* destination port of 0 is illegal, based on RFC2960. */ 5816 if (sh->dest_port == 0) { 5817 SCTP_STAT_INCR(sctps_hdrops); 5818 goto bad; 5819 } 5820 /* 5821 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5822 * IP/SCTP/first chunk header... 5823 */ 5824 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5825 sh, ch, &inp, &net, vrf_id); 5826 if ((net) && (port)) { 5827 if (net->port == 0) { 5828 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5829 } 5830 net->port = port; 5831 } 5832 /* inp's ref-count increased && stcb locked */ 5833 if (inp == NULL) { 5834 struct sctp_init_chunk *init_chk, chunk_buf; 5835 5836 SCTP_STAT_INCR(sctps_noport); 5837 #ifdef ICMP_BANDLIM 5838 /* 5839 * we use the bandwidth limiting to protect against sending 5840 * too many ABORTS all at once. In this case these count the 5841 * same as an ICMP message. 5842 */ 5843 if (badport_bandlim(0) < 0) 5844 goto bad; 5845 #endif /* ICMP_BANDLIM */ 5846 SCTPDBG(SCTP_DEBUG_INPUT1, 5847 "Sending a ABORT from packet entry!\n"); 5848 if (ch->chunk_type == SCTP_INITIATION) { 5849 /* 5850 * we do a trick here to get the INIT tag, dig in 5851 * and get the tag from the INIT and put it in the 5852 * common header. 5853 */ 5854 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5855 iphlen + sizeof(*sh), sizeof(*init_chk), 5856 (uint8_t *) & chunk_buf); 5857 if (init_chk != NULL) 5858 sh->v_tag = init_chk->init.initiate_tag; 5859 } 5860 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5861 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5862 goto bad; 5863 } 5864 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5865 goto bad; 5866 } 5867 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5868 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5869 goto bad; 5870 } else if (stcb == NULL) { 5871 refcount_up = 1; 5872 } 5873 #ifdef IPSEC 5874 /* 5875 * I very much doubt any of the IPSEC stuff will work but I have no 5876 * idea, so I will leave it in place. 5877 */ 5878 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5879 MODULE_GLOBAL(MOD_IPSEC, ipsec4stat).in_polvio++; 5880 SCTP_STAT_INCR(sctps_hdrops); 5881 goto bad; 5882 } 5883 #endif /* IPSEC */ 5884 5885 /* 5886 * common chunk processing 5887 */ 5888 length = ip->ip_len + iphlen; 5889 offset -= sizeof(struct sctp_chunkhdr); 5890 5891 ecn_bits = ip->ip_tos; 5892 5893 /* sa_ignore NO_NULL_CHK */ 5894 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5895 inp, stcb, net, ecn_bits, vrf_id, port); 5896 /* inp's ref-count reduced && stcb unlocked */ 5897 if (m) { 5898 sctp_m_freem(m); 5899 } 5900 if ((inp) && (refcount_up)) { 5901 /* reduce ref-count */ 5902 SCTP_INP_DECR_REF(inp); 5903 } 5904 return; 5905 bad: 5906 if (stcb) { 5907 SCTP_TCB_UNLOCK(stcb); 5908 } 5909 if ((inp) && (refcount_up)) { 5910 /* reduce ref-count */ 5911 SCTP_INP_DECR_REF(inp); 5912 } 5913 if (m) { 5914 sctp_m_freem(m); 5915 } 5916 return; 5917 } 5918 void 5919 sctp_input(i_pak, off) 5920 struct mbuf *i_pak; 5921 int off; 5922 { 5923 sctp_input_with_port(i_pak, off, 0); 5924 }
Cache object: f21986742d2d14d8774d9cd9d3b784ca
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