1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #include <netinet/udp.h> 51 52 53 54 static void 55 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 56 { 57 struct sctp_nets *net; 58 59 /* 60 * This now not only stops all cookie timers it also stops any INIT 61 * timers as well. This will make sure that the timers are stopped 62 * in all collision cases. 63 */ 64 SCTP_TCB_LOCK_ASSERT(stcb); 65 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 66 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 67 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 68 stcb->sctp_ep, 69 stcb, 70 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 71 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 76 } 77 } 78 } 79 80 /* INIT handler */ 81 static void 82 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 83 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 84 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 85 { 86 struct sctp_init *init; 87 struct mbuf *op_err; 88 uint32_t init_limit; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 95 goto outnow; 96 } 97 } 98 op_err = NULL; 99 init = &cp->init; 100 /* First are we accepting? */ 101 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 102 SCTPDBG(SCTP_DEBUG_INPUT2, 103 "sctp_handle_init: Abort, so_qlimit:%d\n", 104 inp->sctp_socket->so_qlimit); 105 /* 106 * FIX ME ?? What about TCP model and we have a 107 * match/restart case? Actually no fix is needed. the lookup 108 * will always find the existing assoc so stcb would not be 109 * NULL. It may be questionable to do this since we COULD 110 * just send back the INIT-ACK and hope that the app did 111 * accept()'s by the time the COOKIE was sent. But there is 112 * a price to pay for COOKIE generation and I don't want to 113 * pay it on the chance that the app will actually do some 114 * accepts(). The App just looses and should NOT be in this 115 * state :-) 116 */ 117 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 124 /* Invalid length */ 125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 126 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 /* validate parameters */ 133 if (init->initiate_tag == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 143 /* invalid parameter... send abort */ 144 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 145 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 146 vrf_id, port); 147 if (stcb) 148 *abort_no_unlock = 1; 149 goto outnow; 150 } 151 if (init->num_inbound_streams == 0) { 152 /* protocol error... send abort */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 if (init->num_outbound_streams == 0) { 161 /* protocol error... send abort */ 162 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 163 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 164 vrf_id, port); 165 if (stcb) 166 *abort_no_unlock = 1; 167 goto outnow; 168 } 169 init_limit = offset + ntohs(cp->ch.chunk_length); 170 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 171 init_limit)) { 172 /* auth parameter(s) error... send abort */ 173 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 174 if (stcb) 175 *abort_no_unlock = 1; 176 goto outnow; 177 } 178 /* send an INIT-ACK w/cookie */ 179 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 180 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 181 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 182 outnow: 183 if (stcb == NULL) { 184 SCTP_INP_RUNLOCK(inp); 185 } 186 } 187 188 /* 189 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 190 */ 191 192 int 193 sctp_is_there_unsent_data(struct sctp_tcb *stcb) 194 { 195 int unsent_data = 0; 196 struct sctp_stream_queue_pending *sp; 197 struct sctp_stream_out *strq; 198 struct sctp_association *asoc; 199 200 /* 201 * This function returns the number of streams that have true unsent 202 * data on them. Note that as it looks through it will clean up any 203 * places that have old data that has been sent but left at top of 204 * stream queue. 205 */ 206 asoc = &stcb->asoc; 207 SCTP_TCB_SEND_LOCK(stcb); 208 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 209 /* Check to see if some data queued */ 210 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 211 is_there_another: 212 /* sa_ignore FREED_MEMORY */ 213 sp = TAILQ_FIRST(&strq->outqueue); 214 if (sp == NULL) { 215 continue; 216 } 217 if ((sp->msg_is_complete) && 218 (sp->length == 0) && 219 (sp->sender_all_done)) { 220 /* 221 * We are doing differed cleanup. Last time 222 * through when we took all the data the 223 * sender_all_done was not set. 224 */ 225 if (sp->put_last_out == 0) { 226 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 227 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 228 sp->sender_all_done, 229 sp->length, 230 sp->msg_is_complete, 231 sp->put_last_out); 232 } 233 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 234 TAILQ_REMOVE(&strq->outqueue, sp, next); 235 sctp_free_remote_addr(sp->net); 236 if (sp->data) { 237 sctp_m_freem(sp->data); 238 sp->data = NULL; 239 } 240 sctp_free_a_strmoq(stcb, sp); 241 goto is_there_another; 242 } else { 243 unsent_data++; 244 continue; 245 } 246 } 247 } 248 SCTP_TCB_SEND_UNLOCK(stcb); 249 return (unsent_data); 250 } 251 252 static int 253 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 254 struct sctp_nets *net) 255 { 256 struct sctp_init *init; 257 struct sctp_association *asoc; 258 struct sctp_nets *lnet; 259 unsigned int i; 260 261 init = &cp->init; 262 asoc = &stcb->asoc; 263 /* save off parameters */ 264 asoc->peer_vtag = ntohl(init->initiate_tag); 265 asoc->peers_rwnd = ntohl(init->a_rwnd); 266 if (TAILQ_FIRST(&asoc->nets)) { 267 /* update any ssthresh's that may have a default */ 268 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 269 lnet->ssthresh = asoc->peers_rwnd; 270 271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 272 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 273 } 274 } 275 } 276 SCTP_TCB_SEND_LOCK(stcb); 277 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 278 unsigned int newcnt; 279 struct sctp_stream_out *outs; 280 struct sctp_stream_queue_pending *sp; 281 282 /* cut back on number of streams */ 283 newcnt = ntohs(init->num_inbound_streams); 284 /* This if is probably not needed but I am cautious */ 285 if (asoc->strmout) { 286 /* First make sure no data chunks are trapped */ 287 for (i = newcnt; i < asoc->pre_open_streams; i++) { 288 outs = &asoc->strmout[i]; 289 sp = TAILQ_FIRST(&outs->outqueue); 290 while (sp) { 291 TAILQ_REMOVE(&outs->outqueue, sp, 292 next); 293 asoc->stream_queue_cnt--; 294 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 295 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 296 sp, SCTP_SO_NOT_LOCKED); 297 if (sp->data) { 298 sctp_m_freem(sp->data); 299 sp->data = NULL; 300 } 301 sctp_free_remote_addr(sp->net); 302 sp->net = NULL; 303 /* Free the chunk */ 304 SCTP_PRINTF("sp:%p tcb:%p weird free case\n", 305 sp, stcb); 306 307 sctp_free_a_strmoq(stcb, sp); 308 /* sa_ignore FREED_MEMORY */ 309 sp = TAILQ_FIRST(&outs->outqueue); 310 } 311 } 312 } 313 /* cut back the count and abandon the upper streams */ 314 asoc->pre_open_streams = newcnt; 315 } 316 SCTP_TCB_SEND_UNLOCK(stcb); 317 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 318 /* init tsn's */ 319 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 320 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 321 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 322 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 323 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 324 } 325 /* This is the next one we expect */ 326 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 327 328 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 329 /* 330 * EY 05/13/08 - nr_sack: initialize nr_mapping array's base tsn 331 * like above 332 */ 333 asoc->nr_mapping_array_base_tsn = ntohl(init->initial_tsn); 334 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 335 asoc->last_echo_tsn = asoc->asconf_seq_in; 336 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 337 /* open the requested streams */ 338 339 if (asoc->strmin != NULL) { 340 /* Free the old ones */ 341 struct sctp_queued_to_read *ctl; 342 343 for (i = 0; i < asoc->streamincnt; i++) { 344 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 345 while (ctl) { 346 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 347 sctp_free_remote_addr(ctl->whoFrom); 348 ctl->whoFrom = NULL; 349 sctp_m_freem(ctl->data); 350 ctl->data = NULL; 351 sctp_free_a_readq(stcb, ctl); 352 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 353 } 354 } 355 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 356 } 357 asoc->streamincnt = ntohs(init->num_outbound_streams); 358 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 359 asoc->streamincnt = MAX_SCTP_STREAMS; 360 } 361 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 362 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 363 if (asoc->strmin == NULL) { 364 /* we didn't get memory for the streams! */ 365 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 366 return (-1); 367 } 368 for (i = 0; i < asoc->streamincnt; i++) { 369 asoc->strmin[i].stream_no = i; 370 asoc->strmin[i].last_sequence_delivered = 0xffff; 371 /* 372 * U-stream ranges will be set when the cookie is unpacked. 373 * Or for the INIT sender they are un set (if pr-sctp not 374 * supported) when the INIT-ACK arrives. 375 */ 376 TAILQ_INIT(&asoc->strmin[i].inqueue); 377 asoc->strmin[i].delivery_started = 0; 378 } 379 /* 380 * load_address_from_init will put the addresses into the 381 * association when the COOKIE is processed or the INIT-ACK is 382 * processed. Both types of COOKIE's existing and new call this 383 * routine. It will remove addresses that are no longer in the 384 * association (for the restarting case where addresses are 385 * removed). Up front when the INIT arrives we will discard it if it 386 * is a restart and new addresses have been added. 387 */ 388 /* sa_ignore MEMLEAK */ 389 return (0); 390 } 391 392 /* 393 * INIT-ACK message processing/consumption returns value < 0 on error 394 */ 395 static int 396 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 397 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 398 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 399 { 400 struct sctp_association *asoc; 401 struct mbuf *op_err; 402 int retval, abort_flag; 403 uint32_t initack_limit; 404 int nat_friendly = 0; 405 406 /* First verify that we have no illegal param's */ 407 abort_flag = 0; 408 op_err = NULL; 409 410 op_err = sctp_arethere_unrecognized_parameters(m, 411 (offset + sizeof(struct sctp_init_chunk)), 412 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 asoc = &stcb->asoc; 420 asoc->peer_supports_nat = (uint8_t) nat_friendly; 421 /* process the peer's parameters in the INIT-ACK */ 422 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 423 if (retval < 0) { 424 return (retval); 425 } 426 initack_limit = offset + ntohs(cp->ch.chunk_length); 427 /* load all addresses */ 428 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 429 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 430 NULL))) { 431 /* Huh, we should abort */ 432 SCTPDBG(SCTP_DEBUG_INPUT1, 433 "Load addresses from INIT causes an abort %d\n", 434 retval); 435 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 436 NULL, 0, net->port); 437 *abort_no_unlock = 1; 438 return (-1); 439 } 440 /* if the peer doesn't support asconf, flush the asconf queue */ 441 if (asoc->peer_supports_asconf == 0) { 442 struct sctp_asconf_addr *aparam; 443 444 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 445 /* sa_ignore FREED_MEMORY */ 446 aparam = TAILQ_FIRST(&asoc->asconf_queue); 447 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 448 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 449 } 450 } 451 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 452 stcb->asoc.local_hmacs); 453 if (op_err) { 454 sctp_queue_op_err(stcb, op_err); 455 /* queuing will steal away the mbuf chain to the out queue */ 456 op_err = NULL; 457 } 458 /* extract the cookie and queue it to "echo" it back... */ 459 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 460 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 461 stcb->asoc.overall_error_count, 462 0, 463 SCTP_FROM_SCTP_INPUT, 464 __LINE__); 465 } 466 stcb->asoc.overall_error_count = 0; 467 net->error_count = 0; 468 469 /* 470 * Cancel the INIT timer, We do this first before queueing the 471 * cookie. We always cancel at the primary to assue that we are 472 * canceling the timer started by the INIT which always goes to the 473 * primary. 474 */ 475 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 476 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 477 478 /* calculate the RTO */ 479 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 480 481 retval = sctp_send_cookie_echo(m, offset, stcb, net); 482 if (retval < 0) { 483 /* 484 * No cookie, we probably should send a op error. But in any 485 * case if there is no cookie in the INIT-ACK, we can 486 * abandon the peer, its broke. 487 */ 488 if (retval == -3) { 489 /* We abort with an error of missing mandatory param */ 490 op_err = 491 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 492 if (op_err) { 493 /* 494 * Expand beyond to include the mandatory 495 * param cookie 496 */ 497 struct sctp_inv_mandatory_param *mp; 498 499 SCTP_BUF_LEN(op_err) = 500 sizeof(struct sctp_inv_mandatory_param); 501 mp = mtod(op_err, 502 struct sctp_inv_mandatory_param *); 503 /* Subtract the reserved param */ 504 mp->length = 505 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 506 mp->num_param = htonl(1); 507 mp->param = htons(SCTP_STATE_COOKIE); 508 mp->resv = 0; 509 } 510 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 511 sh, op_err, 0, net->port); 512 *abort_no_unlock = 1; 513 } 514 return (retval); 515 } 516 return (0); 517 } 518 519 static void 520 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 521 struct sctp_tcb *stcb, struct sctp_nets *net) 522 { 523 struct sockaddr_storage store; 524 struct sockaddr_in *sin; 525 struct sockaddr_in6 *sin6; 526 struct sctp_nets *r_net; 527 struct timeval tv; 528 int req_prim = 0; 529 530 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 531 /* Invalid length */ 532 return; 533 } 534 sin = (struct sockaddr_in *)&store; 535 sin6 = (struct sockaddr_in6 *)&store; 536 537 memset(&store, 0, sizeof(store)); 538 if (cp->heartbeat.hb_info.addr_family == AF_INET && 539 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 540 sin->sin_family = cp->heartbeat.hb_info.addr_family; 541 sin->sin_len = cp->heartbeat.hb_info.addr_len; 542 sin->sin_port = stcb->rport; 543 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 544 sizeof(sin->sin_addr)); 545 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 546 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 547 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 548 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 549 sin6->sin6_port = stcb->rport; 550 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 551 sizeof(sin6->sin6_addr)); 552 } else { 553 return; 554 } 555 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 556 if (r_net == NULL) { 557 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 558 return; 559 } 560 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 561 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 562 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 563 /* 564 * If the its a HB and it's random value is correct when can 565 * confirm the destination. 566 */ 567 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 568 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 569 stcb->asoc.primary_destination = r_net; 570 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 571 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 572 r_net = TAILQ_FIRST(&stcb->asoc.nets); 573 if (r_net != stcb->asoc.primary_destination) { 574 /* 575 * first one on the list is NOT the primary 576 * sctp_cmpaddr() is much more efficent if 577 * the primary is the first on the list, 578 * make it so. 579 */ 580 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 581 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 582 } 583 req_prim = 1; 584 } 585 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 586 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 587 } 588 r_net->error_count = 0; 589 r_net->hb_responded = 1; 590 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 591 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 592 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 593 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 594 r_net->dest_state |= SCTP_ADDR_REACHABLE; 595 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 596 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 597 /* now was it the primary? if so restore */ 598 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 599 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 600 } 601 } 602 /* 603 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 604 * set the destination to active state and set the cwnd to one or 605 * two MTU's based on whether PF1 or PF2 is being used. If a T3 606 * timer is running, for the destination, stop the timer because a 607 * PF-heartbeat was received. 608 */ 609 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 610 SCTP_BASE_SYSCTL(sctp_cmt_pf) && 611 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 612 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 613 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 614 stcb, net, 615 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 616 } 617 net->dest_state &= ~SCTP_ADDR_PF; 618 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 619 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 620 net, net->cwnd); 621 } 622 /* Now lets do a RTO with this */ 623 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 624 /* Mobility adaptation */ 625 if (req_prim) { 626 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 627 SCTP_MOBILITY_BASE) || 628 sctp_is_mobility_feature_on(stcb->sctp_ep, 629 SCTP_MOBILITY_FASTHANDOFF)) && 630 sctp_is_mobility_feature_on(stcb->sctp_ep, 631 SCTP_MOBILITY_PRIM_DELETED)) { 632 633 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 634 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 635 SCTP_MOBILITY_FASTHANDOFF)) { 636 sctp_assoc_immediate_retrans(stcb, 637 stcb->asoc.primary_destination); 638 } 639 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 640 SCTP_MOBILITY_BASE)) { 641 sctp_move_chunks_from_deleted_prim(stcb, 642 stcb->asoc.primary_destination); 643 } 644 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 645 stcb->asoc.deleted_primary); 646 } 647 } 648 } 649 650 static int 651 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 652 { 653 /* 654 * return 0 means we want you to proceed with the abort non-zero 655 * means no abort processing 656 */ 657 struct sctpasochead *head; 658 659 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 660 /* generate a new vtag and send init */ 661 LIST_REMOVE(stcb, sctp_asocs); 662 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 663 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 664 /* 665 * put it in the bucket in the vtag hash of assoc's for the 666 * system 667 */ 668 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 669 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 670 return (1); 671 } 672 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 673 /* 674 * treat like a case where the cookie expired i.e.: - dump 675 * current cookie. - generate a new vtag. - resend init. 676 */ 677 /* generate a new vtag and send init */ 678 LIST_REMOVE(stcb, sctp_asocs); 679 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 680 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 681 sctp_stop_all_cookie_timers(stcb); 682 sctp_toss_old_cookies(stcb, &stcb->asoc); 683 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 684 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 685 /* 686 * put it in the bucket in the vtag hash of assoc's for the 687 * system 688 */ 689 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 690 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 691 return (1); 692 } 693 return (0); 694 } 695 696 static int 697 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 698 struct sctp_nets *net) 699 { 700 /* 701 * return 0 means we want you to proceed with the abort non-zero 702 * means no abort processing 703 */ 704 if (stcb->asoc.peer_supports_auth == 0) { 705 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 706 return (0); 707 } 708 sctp_asconf_send_nat_state_update(stcb, net); 709 return (1); 710 } 711 712 713 static void 714 sctp_handle_abort(struct sctp_abort_chunk *cp, 715 struct sctp_tcb *stcb, struct sctp_nets *net) 716 { 717 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 718 struct socket *so; 719 720 #endif 721 uint16_t len; 722 723 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 724 if (stcb == NULL) 725 return; 726 727 len = ntohs(cp->ch.chunk_length); 728 if (len > sizeof(struct sctp_chunkhdr)) { 729 /* 730 * Need to check the cause codes for our two magic nat 731 * aborts which don't kill the assoc necessarily. 732 */ 733 struct sctp_abort_chunk *cpnext; 734 struct sctp_missing_nat_state *natc; 735 uint16_t cause; 736 737 cpnext = cp; 738 cpnext++; 739 natc = (struct sctp_missing_nat_state *)cpnext; 740 cause = ntohs(natc->cause); 741 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 742 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 743 cp->ch.chunk_flags); 744 if (sctp_handle_nat_colliding_state(stcb)) { 745 return; 746 } 747 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 749 cp->ch.chunk_flags); 750 if (sctp_handle_nat_missing_state(stcb, net)) { 751 return; 752 } 753 } 754 } 755 /* stop any receive timers */ 756 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 757 /* notify user of the abort and clean up... */ 758 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 759 /* free the tcb */ 760 #if defined(SCTP_PANIC_ON_ABORT) 761 printf("stcb:%p state:%d rport:%d net:%p\n", 762 stcb, stcb->asoc.state, stcb->rport, net); 763 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 764 panic("Received an ABORT"); 765 } else { 766 printf("No panic its in state %x closed\n", stcb->asoc.state); 767 } 768 #endif 769 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 770 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 771 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 772 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 773 } 774 #ifdef SCTP_ASOCLOG_OF_TSNS 775 sctp_print_out_track_log(stcb); 776 #endif 777 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 778 so = SCTP_INP_SO(stcb->sctp_ep); 779 atomic_add_int(&stcb->asoc.refcnt, 1); 780 SCTP_TCB_UNLOCK(stcb); 781 SCTP_SOCKET_LOCK(so, 1); 782 SCTP_TCB_LOCK(stcb); 783 atomic_subtract_int(&stcb->asoc.refcnt, 1); 784 #endif 785 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 786 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 787 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 788 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 789 SCTP_SOCKET_UNLOCK(so, 1); 790 #endif 791 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 792 } 793 794 static void 795 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 796 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 797 { 798 struct sctp_association *asoc; 799 int some_on_streamwheel; 800 801 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 802 struct socket *so; 803 804 #endif 805 806 SCTPDBG(SCTP_DEBUG_INPUT2, 807 "sctp_handle_shutdown: handling SHUTDOWN\n"); 808 if (stcb == NULL) 809 return; 810 asoc = &stcb->asoc; 811 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 812 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 813 return; 814 } 815 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 816 /* Shutdown NOT the expected size */ 817 return; 818 } else { 819 sctp_update_acked(stcb, cp, net, abort_flag); 820 } 821 if (asoc->control_pdapi) { 822 /* 823 * With a normal shutdown we assume the end of last record. 824 */ 825 SCTP_INP_READ_LOCK(stcb->sctp_ep); 826 asoc->control_pdapi->end_added = 1; 827 asoc->control_pdapi->pdapi_aborted = 1; 828 asoc->control_pdapi = NULL; 829 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 830 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 831 so = SCTP_INP_SO(stcb->sctp_ep); 832 atomic_add_int(&stcb->asoc.refcnt, 1); 833 SCTP_TCB_UNLOCK(stcb); 834 SCTP_SOCKET_LOCK(so, 1); 835 SCTP_TCB_LOCK(stcb); 836 atomic_subtract_int(&stcb->asoc.refcnt, 1); 837 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 838 /* assoc was freed while we were unlocked */ 839 SCTP_SOCKET_UNLOCK(so, 1); 840 return; 841 } 842 #endif 843 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 844 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 845 SCTP_SOCKET_UNLOCK(so, 1); 846 #endif 847 } 848 /* goto SHUTDOWN_RECEIVED state to block new requests */ 849 if (stcb->sctp_socket) { 850 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 851 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 852 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 853 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 854 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 855 /* 856 * notify upper layer that peer has initiated a 857 * shutdown 858 */ 859 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 860 861 /* reset time */ 862 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 863 } 864 } 865 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 866 /* 867 * stop the shutdown timer, since we WILL move to 868 * SHUTDOWN-ACK-SENT. 869 */ 870 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 871 } 872 /* Now is there unsent data on a stream somewhere? */ 873 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 874 875 if (!TAILQ_EMPTY(&asoc->send_queue) || 876 !TAILQ_EMPTY(&asoc->sent_queue) || 877 some_on_streamwheel) { 878 /* By returning we will push more data out */ 879 return; 880 } else { 881 /* no outstanding data to send, so move on... */ 882 /* send SHUTDOWN-ACK */ 883 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 884 /* move to SHUTDOWN-ACK-SENT state */ 885 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 886 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 887 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 888 } 889 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 890 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 891 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 892 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 893 /* start SHUTDOWN timer */ 894 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 895 stcb, net); 896 } 897 } 898 899 static void 900 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 901 struct sctp_tcb *stcb, struct sctp_nets *net) 902 { 903 struct sctp_association *asoc; 904 905 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 906 struct socket *so; 907 908 so = SCTP_INP_SO(stcb->sctp_ep); 909 #endif 910 SCTPDBG(SCTP_DEBUG_INPUT2, 911 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 912 if (stcb == NULL) 913 return; 914 915 asoc = &stcb->asoc; 916 /* process according to association state */ 917 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 918 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 919 /* unexpected SHUTDOWN-ACK... so ignore... */ 920 SCTP_TCB_UNLOCK(stcb); 921 return; 922 } 923 if (asoc->control_pdapi) { 924 /* 925 * With a normal shutdown we assume the end of last record. 926 */ 927 SCTP_INP_READ_LOCK(stcb->sctp_ep); 928 asoc->control_pdapi->end_added = 1; 929 asoc->control_pdapi->pdapi_aborted = 1; 930 asoc->control_pdapi = NULL; 931 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 932 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 933 atomic_add_int(&stcb->asoc.refcnt, 1); 934 SCTP_TCB_UNLOCK(stcb); 935 SCTP_SOCKET_LOCK(so, 1); 936 SCTP_TCB_LOCK(stcb); 937 atomic_subtract_int(&stcb->asoc.refcnt, 1); 938 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 939 /* assoc was freed while we were unlocked */ 940 SCTP_SOCKET_UNLOCK(so, 1); 941 return; 942 } 943 #endif 944 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 945 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 946 SCTP_SOCKET_UNLOCK(so, 1); 947 #endif 948 } 949 /* are the queues empty? */ 950 if (!TAILQ_EMPTY(&asoc->send_queue) || 951 !TAILQ_EMPTY(&asoc->sent_queue) || 952 !TAILQ_EMPTY(&asoc->out_wheel)) { 953 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 954 } 955 /* stop the timer */ 956 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 957 /* send SHUTDOWN-COMPLETE */ 958 sctp_send_shutdown_complete(stcb, net); 959 /* notify upper layer protocol */ 960 if (stcb->sctp_socket) { 961 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 962 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 963 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 964 /* Set the connected flag to disconnected */ 965 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 966 } 967 } 968 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 969 /* free the TCB but first save off the ep */ 970 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 971 atomic_add_int(&stcb->asoc.refcnt, 1); 972 SCTP_TCB_UNLOCK(stcb); 973 SCTP_SOCKET_LOCK(so, 1); 974 SCTP_TCB_LOCK(stcb); 975 atomic_subtract_int(&stcb->asoc.refcnt, 1); 976 #endif 977 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 978 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 979 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 980 SCTP_SOCKET_UNLOCK(so, 1); 981 #endif 982 } 983 984 /* 985 * Skip past the param header and then we will find the chunk that caused the 986 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 987 * our peer must be broken. 988 */ 989 static void 990 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 991 struct sctp_nets *net) 992 { 993 struct sctp_chunkhdr *chk; 994 995 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 996 switch (chk->chunk_type) { 997 case SCTP_ASCONF_ACK: 998 case SCTP_ASCONF: 999 sctp_asconf_cleanup(stcb, net); 1000 break; 1001 case SCTP_FORWARD_CUM_TSN: 1002 stcb->asoc.peer_supports_prsctp = 0; 1003 break; 1004 default: 1005 SCTPDBG(SCTP_DEBUG_INPUT2, 1006 "Peer does not support chunk type %d(%x)??\n", 1007 chk->chunk_type, (uint32_t) chk->chunk_type); 1008 break; 1009 } 1010 } 1011 1012 /* 1013 * Skip past the param header and then we will find the param that caused the 1014 * problem. There are a number of param's in a ASCONF OR the prsctp param 1015 * these will turn of specific features. 1016 */ 1017 static void 1018 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1019 { 1020 struct sctp_paramhdr *pbad; 1021 1022 pbad = phdr + 1; 1023 switch (ntohs(pbad->param_type)) { 1024 /* pr-sctp draft */ 1025 case SCTP_PRSCTP_SUPPORTED: 1026 stcb->asoc.peer_supports_prsctp = 0; 1027 break; 1028 case SCTP_SUPPORTED_CHUNK_EXT: 1029 break; 1030 /* draft-ietf-tsvwg-addip-sctp */ 1031 case SCTP_HAS_NAT_SUPPORT: 1032 stcb->asoc.peer_supports_nat = 0; 1033 break; 1034 case SCTP_ECN_NONCE_SUPPORTED: 1035 stcb->asoc.peer_supports_ecn_nonce = 0; 1036 stcb->asoc.ecn_nonce_allowed = 0; 1037 stcb->asoc.ecn_allowed = 0; 1038 break; 1039 case SCTP_ADD_IP_ADDRESS: 1040 case SCTP_DEL_IP_ADDRESS: 1041 case SCTP_SET_PRIM_ADDR: 1042 stcb->asoc.peer_supports_asconf = 0; 1043 break; 1044 case SCTP_SUCCESS_REPORT: 1045 case SCTP_ERROR_CAUSE_IND: 1046 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1047 SCTPDBG(SCTP_DEBUG_INPUT2, 1048 "Turning off ASCONF to this strange peer\n"); 1049 stcb->asoc.peer_supports_asconf = 0; 1050 break; 1051 default: 1052 SCTPDBG(SCTP_DEBUG_INPUT2, 1053 "Peer does not support param type %d(%x)??\n", 1054 pbad->param_type, (uint32_t) pbad->param_type); 1055 break; 1056 } 1057 } 1058 1059 static int 1060 sctp_handle_error(struct sctp_chunkhdr *ch, 1061 struct sctp_tcb *stcb, struct sctp_nets *net) 1062 { 1063 int chklen; 1064 struct sctp_paramhdr *phdr; 1065 uint16_t error_type; 1066 uint16_t error_len; 1067 struct sctp_association *asoc; 1068 int adjust; 1069 1070 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1071 struct socket *so; 1072 1073 #endif 1074 1075 /* parse through all of the errors and process */ 1076 asoc = &stcb->asoc; 1077 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1078 sizeof(struct sctp_chunkhdr)); 1079 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1080 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1081 /* Process an Error Cause */ 1082 error_type = ntohs(phdr->param_type); 1083 error_len = ntohs(phdr->param_length); 1084 if ((error_len > chklen) || (error_len == 0)) { 1085 /* invalid param length for this param */ 1086 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1087 chklen, error_len); 1088 return (0); 1089 } 1090 switch (error_type) { 1091 case SCTP_CAUSE_INVALID_STREAM: 1092 case SCTP_CAUSE_MISSING_PARAM: 1093 case SCTP_CAUSE_INVALID_PARAM: 1094 case SCTP_CAUSE_NO_USER_DATA: 1095 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1096 error_type); 1097 break; 1098 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1099 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1100 ch->chunk_flags); 1101 if (sctp_handle_nat_colliding_state(stcb)) { 1102 return (0); 1103 } 1104 break; 1105 case SCTP_CAUSE_NAT_MISSING_STATE: 1106 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1107 ch->chunk_flags); 1108 if (sctp_handle_nat_missing_state(stcb, net)) { 1109 return (0); 1110 } 1111 break; 1112 case SCTP_CAUSE_STALE_COOKIE: 1113 /* 1114 * We only act if we have echoed a cookie and are 1115 * waiting. 1116 */ 1117 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1118 int *p; 1119 1120 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1121 /* Save the time doubled */ 1122 asoc->cookie_preserve_req = ntohl(*p) << 1; 1123 asoc->stale_cookie_count++; 1124 if (asoc->stale_cookie_count > 1125 asoc->max_init_times) { 1126 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1127 /* now free the asoc */ 1128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1129 so = SCTP_INP_SO(stcb->sctp_ep); 1130 atomic_add_int(&stcb->asoc.refcnt, 1); 1131 SCTP_TCB_UNLOCK(stcb); 1132 SCTP_SOCKET_LOCK(so, 1); 1133 SCTP_TCB_LOCK(stcb); 1134 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1135 #endif 1136 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1138 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1139 SCTP_SOCKET_UNLOCK(so, 1); 1140 #endif 1141 return (-1); 1142 } 1143 /* blast back to INIT state */ 1144 sctp_toss_old_cookies(stcb, &stcb->asoc); 1145 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1146 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1147 sctp_stop_all_cookie_timers(stcb); 1148 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1149 } 1150 break; 1151 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1152 /* 1153 * Nothing we can do here, we don't do hostname 1154 * addresses so if the peer does not like my IPv6 1155 * (or IPv4 for that matter) it does not matter. If 1156 * they don't support that type of address, they can 1157 * NOT possibly get that packet type... i.e. with no 1158 * IPv6 you can't recieve a IPv6 packet. so we can 1159 * safely ignore this one. If we ever added support 1160 * for HOSTNAME Addresses, then we would need to do 1161 * something here. 1162 */ 1163 break; 1164 case SCTP_CAUSE_UNRECOG_CHUNK: 1165 sctp_process_unrecog_chunk(stcb, phdr, net); 1166 break; 1167 case SCTP_CAUSE_UNRECOG_PARAM: 1168 sctp_process_unrecog_param(stcb, phdr); 1169 break; 1170 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1171 /* 1172 * We ignore this since the timer will drive out a 1173 * new cookie anyway and there timer will drive us 1174 * to send a SHUTDOWN_COMPLETE. We can't send one 1175 * here since we don't have their tag. 1176 */ 1177 break; 1178 case SCTP_CAUSE_DELETING_LAST_ADDR: 1179 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1180 case SCTP_CAUSE_DELETING_SRC_ADDR: 1181 /* 1182 * We should NOT get these here, but in a 1183 * ASCONF-ACK. 1184 */ 1185 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1186 error_type); 1187 break; 1188 case SCTP_CAUSE_OUT_OF_RESC: 1189 /* 1190 * And what, pray tell do we do with the fact that 1191 * the peer is out of resources? Not really sure we 1192 * could do anything but abort. I suspect this 1193 * should have came WITH an abort instead of in a 1194 * OP-ERROR. 1195 */ 1196 break; 1197 default: 1198 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1199 error_type); 1200 break; 1201 } 1202 adjust = SCTP_SIZE32(error_len); 1203 chklen -= adjust; 1204 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1205 } 1206 return (0); 1207 } 1208 1209 static int 1210 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1211 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1212 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1213 { 1214 struct sctp_init_ack *init_ack; 1215 struct mbuf *op_err; 1216 1217 SCTPDBG(SCTP_DEBUG_INPUT2, 1218 "sctp_handle_init_ack: handling INIT-ACK\n"); 1219 1220 if (stcb == NULL) { 1221 SCTPDBG(SCTP_DEBUG_INPUT2, 1222 "sctp_handle_init_ack: TCB is null\n"); 1223 return (-1); 1224 } 1225 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1226 /* Invalid length */ 1227 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1228 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1229 op_err, 0, net->port); 1230 *abort_no_unlock = 1; 1231 return (-1); 1232 } 1233 init_ack = &cp->init; 1234 /* validate parameters */ 1235 if (init_ack->initiate_tag == 0) { 1236 /* protocol error... send an abort */ 1237 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1238 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1239 op_err, 0, net->port); 1240 *abort_no_unlock = 1; 1241 return (-1); 1242 } 1243 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1244 /* protocol error... send an abort */ 1245 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1246 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1247 op_err, 0, net->port); 1248 *abort_no_unlock = 1; 1249 return (-1); 1250 } 1251 if (init_ack->num_inbound_streams == 0) { 1252 /* protocol error... send an abort */ 1253 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1254 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1255 op_err, 0, net->port); 1256 *abort_no_unlock = 1; 1257 return (-1); 1258 } 1259 if (init_ack->num_outbound_streams == 0) { 1260 /* protocol error... send an abort */ 1261 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1262 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1263 op_err, 0, net->port); 1264 *abort_no_unlock = 1; 1265 return (-1); 1266 } 1267 /* process according to association state... */ 1268 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1269 case SCTP_STATE_COOKIE_WAIT: 1270 /* this is the expected state for this chunk */ 1271 /* process the INIT-ACK parameters */ 1272 if (stcb->asoc.primary_destination->dest_state & 1273 SCTP_ADDR_UNCONFIRMED) { 1274 /* 1275 * The primary is where we sent the INIT, we can 1276 * always consider it confirmed when the INIT-ACK is 1277 * returned. Do this before we load addresses 1278 * though. 1279 */ 1280 stcb->asoc.primary_destination->dest_state &= 1281 ~SCTP_ADDR_UNCONFIRMED; 1282 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1283 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1284 } 1285 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1286 net, abort_no_unlock, vrf_id) < 0) { 1287 /* error in parsing parameters */ 1288 return (-1); 1289 } 1290 /* update our state */ 1291 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1292 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1293 1294 /* reset the RTO calc */ 1295 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1296 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1297 stcb->asoc.overall_error_count, 1298 0, 1299 SCTP_FROM_SCTP_INPUT, 1300 __LINE__); 1301 } 1302 stcb->asoc.overall_error_count = 0; 1303 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1304 /* 1305 * collapse the init timer back in case of a exponential 1306 * backoff 1307 */ 1308 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1309 stcb, net); 1310 /* 1311 * the send at the end of the inbound data processing will 1312 * cause the cookie to be sent 1313 */ 1314 break; 1315 case SCTP_STATE_SHUTDOWN_SENT: 1316 /* incorrect state... discard */ 1317 break; 1318 case SCTP_STATE_COOKIE_ECHOED: 1319 /* incorrect state... discard */ 1320 break; 1321 case SCTP_STATE_OPEN: 1322 /* incorrect state... discard */ 1323 break; 1324 case SCTP_STATE_EMPTY: 1325 case SCTP_STATE_INUSE: 1326 default: 1327 /* incorrect state... discard */ 1328 return (-1); 1329 break; 1330 } 1331 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1332 return (0); 1333 } 1334 1335 static struct sctp_tcb * 1336 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1337 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1338 struct sctp_inpcb *inp, struct sctp_nets **netp, 1339 struct sockaddr *init_src, int *notification, 1340 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1341 uint32_t vrf_id, uint16_t port); 1342 1343 1344 /* 1345 * handle a state cookie for an existing association m: input packet mbuf 1346 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1347 * "split" mbuf and the cookie signature does not exist offset: offset into 1348 * mbuf to the cookie-echo chunk 1349 */ 1350 static struct sctp_tcb * 1351 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1352 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1353 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1354 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1355 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1356 { 1357 struct sctp_association *asoc; 1358 struct sctp_init_chunk *init_cp, init_buf; 1359 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1360 struct sctp_nets *net; 1361 struct mbuf *op_err; 1362 struct sctp_paramhdr *ph; 1363 int chk_length; 1364 int init_offset, initack_offset, i; 1365 int retval; 1366 int spec_flag = 0; 1367 uint32_t how_indx; 1368 1369 net = *netp; 1370 /* I know that the TCB is non-NULL from the caller */ 1371 asoc = &stcb->asoc; 1372 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1373 if (asoc->cookie_how[how_indx] == 0) 1374 break; 1375 } 1376 if (how_indx < sizeof(asoc->cookie_how)) { 1377 asoc->cookie_how[how_indx] = 1; 1378 } 1379 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1380 /* SHUTDOWN came in after sending INIT-ACK */ 1381 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1382 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1383 0, M_DONTWAIT, 1, MT_DATA); 1384 if (op_err == NULL) { 1385 /* FOOBAR */ 1386 return (NULL); 1387 } 1388 /* Set the len */ 1389 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1390 ph = mtod(op_err, struct sctp_paramhdr *); 1391 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1392 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1393 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1394 vrf_id, net->port); 1395 if (how_indx < sizeof(asoc->cookie_how)) 1396 asoc->cookie_how[how_indx] = 2; 1397 return (NULL); 1398 } 1399 /* 1400 * find and validate the INIT chunk in the cookie (peer's info) the 1401 * INIT should start after the cookie-echo header struct (chunk 1402 * header, state cookie header struct) 1403 */ 1404 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1405 1406 init_cp = (struct sctp_init_chunk *) 1407 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1408 (uint8_t *) & init_buf); 1409 if (init_cp == NULL) { 1410 /* could not pull a INIT chunk in cookie */ 1411 return (NULL); 1412 } 1413 chk_length = ntohs(init_cp->ch.chunk_length); 1414 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1415 return (NULL); 1416 } 1417 /* 1418 * find and validate the INIT-ACK chunk in the cookie (my info) the 1419 * INIT-ACK follows the INIT chunk 1420 */ 1421 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1422 initack_cp = (struct sctp_init_ack_chunk *) 1423 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1424 (uint8_t *) & initack_buf); 1425 if (initack_cp == NULL) { 1426 /* could not pull INIT-ACK chunk in cookie */ 1427 return (NULL); 1428 } 1429 chk_length = ntohs(initack_cp->ch.chunk_length); 1430 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1431 return (NULL); 1432 } 1433 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1434 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1435 /* 1436 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1437 * to get into the OPEN state 1438 */ 1439 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1440 /*- 1441 * Opps, this means that we somehow generated two vtag's 1442 * the same. I.e. we did: 1443 * Us Peer 1444 * <---INIT(tag=a)------ 1445 * ----INIT-ACK(tag=t)--> 1446 * ----INIT(tag=t)------> *1 1447 * <---INIT-ACK(tag=a)--- 1448 * <----CE(tag=t)------------- *2 1449 * 1450 * At point *1 we should be generating a different 1451 * tag t'. Which means we would throw away the CE and send 1452 * ours instead. Basically this is case C (throw away side). 1453 */ 1454 if (how_indx < sizeof(asoc->cookie_how)) 1455 asoc->cookie_how[how_indx] = 17; 1456 return (NULL); 1457 1458 } 1459 switch SCTP_GET_STATE 1460 (asoc) { 1461 case SCTP_STATE_COOKIE_WAIT: 1462 case SCTP_STATE_COOKIE_ECHOED: 1463 /* 1464 * INIT was sent but got a COOKIE_ECHO with the 1465 * correct tags... just accept it...but we must 1466 * process the init so that we can make sure we have 1467 * the right seq no's. 1468 */ 1469 /* First we must process the INIT !! */ 1470 retval = sctp_process_init(init_cp, stcb, net); 1471 if (retval < 0) { 1472 if (how_indx < sizeof(asoc->cookie_how)) 1473 asoc->cookie_how[how_indx] = 3; 1474 return (NULL); 1475 } 1476 /* we have already processed the INIT so no problem */ 1477 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1478 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1479 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1480 /* update current state */ 1481 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1482 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1483 else 1484 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1485 1486 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1487 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1488 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1489 stcb->sctp_ep, stcb, asoc->primary_destination); 1490 } 1491 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1492 sctp_stop_all_cookie_timers(stcb); 1493 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1494 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1495 (inp->sctp_socket->so_qlimit == 0) 1496 ) { 1497 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1498 struct socket *so; 1499 1500 #endif 1501 /* 1502 * Here is where collision would go if we 1503 * did a connect() and instead got a 1504 * init/init-ack/cookie done before the 1505 * init-ack came back.. 1506 */ 1507 stcb->sctp_ep->sctp_flags |= 1508 SCTP_PCB_FLAGS_CONNECTED; 1509 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1510 so = SCTP_INP_SO(stcb->sctp_ep); 1511 atomic_add_int(&stcb->asoc.refcnt, 1); 1512 SCTP_TCB_UNLOCK(stcb); 1513 SCTP_SOCKET_LOCK(so, 1); 1514 SCTP_TCB_LOCK(stcb); 1515 atomic_add_int(&stcb->asoc.refcnt, -1); 1516 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1517 SCTP_SOCKET_UNLOCK(so, 1); 1518 return (NULL); 1519 } 1520 #endif 1521 soisconnected(stcb->sctp_socket); 1522 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1523 SCTP_SOCKET_UNLOCK(so, 1); 1524 #endif 1525 } 1526 /* notify upper layer */ 1527 *notification = SCTP_NOTIFY_ASSOC_UP; 1528 /* 1529 * since we did not send a HB make sure we don't 1530 * double things 1531 */ 1532 net->hb_responded = 1; 1533 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1534 &cookie->time_entered, sctp_align_unsafe_makecopy); 1535 1536 if (stcb->asoc.sctp_autoclose_ticks && 1537 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1538 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1539 inp, stcb, NULL); 1540 } 1541 break; 1542 default: 1543 /* 1544 * we're in the OPEN state (or beyond), so peer must 1545 * have simply lost the COOKIE-ACK 1546 */ 1547 break; 1548 } /* end switch */ 1549 sctp_stop_all_cookie_timers(stcb); 1550 /* 1551 * We ignore the return code here.. not sure if we should 1552 * somehow abort.. but we do have an existing asoc. This 1553 * really should not fail. 1554 */ 1555 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1556 init_offset + sizeof(struct sctp_init_chunk), 1557 initack_offset, sh, init_src)) { 1558 if (how_indx < sizeof(asoc->cookie_how)) 1559 asoc->cookie_how[how_indx] = 4; 1560 return (NULL); 1561 } 1562 /* respond with a COOKIE-ACK */ 1563 sctp_toss_old_cookies(stcb, asoc); 1564 sctp_send_cookie_ack(stcb); 1565 if (how_indx < sizeof(asoc->cookie_how)) 1566 asoc->cookie_how[how_indx] = 5; 1567 return (stcb); 1568 } 1569 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1570 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1571 cookie->tie_tag_my_vtag == 0 && 1572 cookie->tie_tag_peer_vtag == 0) { 1573 /* 1574 * case C in Section 5.2.4 Table 2: XMOO silently discard 1575 */ 1576 if (how_indx < sizeof(asoc->cookie_how)) 1577 asoc->cookie_how[how_indx] = 6; 1578 return (NULL); 1579 } 1580 /* 1581 * If nat support, and the below and stcb is established, send back 1582 * a ABORT(colliding state) if we are established. 1583 */ 1584 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1585 (asoc->peer_supports_nat) && 1586 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1588 (asoc->peer_vtag == 0)))) { 1589 /* 1590 * Special case - Peer's support nat. We may have two init's 1591 * that we gave out the same tag on since one was not 1592 * established.. i.e. we get INIT from host-1 behind the nat 1593 * and we respond tag-a, we get a INIT from host-2 behind 1594 * the nat and we get tag-a again. Then we bring up host-1 1595 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1596 * Now we have colliding state. We must send an abort here 1597 * with colliding state indication. 1598 */ 1599 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1600 0, M_DONTWAIT, 1, MT_DATA); 1601 if (op_err == NULL) { 1602 /* FOOBAR */ 1603 return (NULL); 1604 } 1605 /* pre-reserve some space */ 1606 #ifdef INET6 1607 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1608 #else 1609 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1610 #endif 1611 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1612 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1613 /* Set the len */ 1614 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1615 ph = mtod(op_err, struct sctp_paramhdr *); 1616 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1617 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1618 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1619 return (NULL); 1620 } 1621 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1622 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1623 (asoc->peer_vtag == 0))) { 1624 /* 1625 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1626 * should be ok, re-accept peer info 1627 */ 1628 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1629 /* 1630 * Extension of case C. If we hit this, then the 1631 * random number generator returned the same vtag 1632 * when we first sent our INIT-ACK and when we later 1633 * sent our INIT. The side with the seq numbers that 1634 * are different will be the one that normnally 1635 * would have hit case C. This in effect "extends" 1636 * our vtags in this collision case to be 64 bits. 1637 * The same collision could occur aka you get both 1638 * vtag and seq number the same twice in a row.. but 1639 * is much less likely. If it did happen then we 1640 * would proceed through and bring up the assoc.. we 1641 * may end up with the wrong stream setup however.. 1642 * which would be bad.. but there is no way to 1643 * tell.. until we send on a stream that does not 1644 * exist :-) 1645 */ 1646 if (how_indx < sizeof(asoc->cookie_how)) 1647 asoc->cookie_how[how_indx] = 7; 1648 1649 return (NULL); 1650 } 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 8; 1653 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1654 sctp_stop_all_cookie_timers(stcb); 1655 /* 1656 * since we did not send a HB make sure we don't double 1657 * things 1658 */ 1659 net->hb_responded = 1; 1660 if (stcb->asoc.sctp_autoclose_ticks && 1661 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1662 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1663 NULL); 1664 } 1665 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1666 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1667 1668 /* Note last_cwr_tsn? where is this used? */ 1669 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1670 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1671 /* 1672 * Ok the peer probably discarded our data (if we 1673 * echoed a cookie+data). So anything on the 1674 * sent_queue should be marked for retransmit, we 1675 * may not get something to kick us so it COULD 1676 * still take a timeout to move these.. but it can't 1677 * hurt to mark them. 1678 */ 1679 struct sctp_tmit_chunk *chk; 1680 1681 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1682 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1683 chk->sent = SCTP_DATAGRAM_RESEND; 1684 sctp_flight_size_decrease(chk); 1685 sctp_total_flight_decrease(stcb, chk); 1686 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1687 spec_flag++; 1688 } 1689 } 1690 1691 } 1692 /* process the INIT info (peer's info) */ 1693 retval = sctp_process_init(init_cp, stcb, net); 1694 if (retval < 0) { 1695 if (how_indx < sizeof(asoc->cookie_how)) 1696 asoc->cookie_how[how_indx] = 9; 1697 return (NULL); 1698 } 1699 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1700 init_offset + sizeof(struct sctp_init_chunk), 1701 initack_offset, sh, init_src)) { 1702 if (how_indx < sizeof(asoc->cookie_how)) 1703 asoc->cookie_how[how_indx] = 10; 1704 return (NULL); 1705 } 1706 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1707 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1708 *notification = SCTP_NOTIFY_ASSOC_UP; 1709 1710 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1711 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1712 (inp->sctp_socket->so_qlimit == 0)) { 1713 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1714 struct socket *so; 1715 1716 #endif 1717 stcb->sctp_ep->sctp_flags |= 1718 SCTP_PCB_FLAGS_CONNECTED; 1719 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1720 so = SCTP_INP_SO(stcb->sctp_ep); 1721 atomic_add_int(&stcb->asoc.refcnt, 1); 1722 SCTP_TCB_UNLOCK(stcb); 1723 SCTP_SOCKET_LOCK(so, 1); 1724 SCTP_TCB_LOCK(stcb); 1725 atomic_add_int(&stcb->asoc.refcnt, -1); 1726 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1727 SCTP_SOCKET_UNLOCK(so, 1); 1728 return (NULL); 1729 } 1730 #endif 1731 soisconnected(stcb->sctp_socket); 1732 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1733 SCTP_SOCKET_UNLOCK(so, 1); 1734 #endif 1735 } 1736 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1737 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1738 else 1739 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1740 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1741 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1742 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1743 } else { 1744 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1745 } 1746 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1747 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1748 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1749 stcb->sctp_ep, stcb, asoc->primary_destination); 1750 } 1751 sctp_stop_all_cookie_timers(stcb); 1752 sctp_toss_old_cookies(stcb, asoc); 1753 sctp_send_cookie_ack(stcb); 1754 if (spec_flag) { 1755 /* 1756 * only if we have retrans set do we do this. What 1757 * this call does is get only the COOKIE-ACK out and 1758 * then when we return the normal call to 1759 * sctp_chunk_output will get the retrans out behind 1760 * this. 1761 */ 1762 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1763 } 1764 if (how_indx < sizeof(asoc->cookie_how)) 1765 asoc->cookie_how[how_indx] = 11; 1766 1767 return (stcb); 1768 } 1769 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1770 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1771 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1772 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1773 cookie->tie_tag_peer_vtag != 0) { 1774 struct sctpasochead *head; 1775 1776 if (asoc->peer_supports_nat) { 1777 /* 1778 * This is a gross gross hack. just call the 1779 * cookie_new code since we are allowing a duplicate 1780 * association. I hope this works... 1781 */ 1782 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1783 inp, netp, init_src, notification, 1784 auth_skipped, auth_offset, auth_len, 1785 vrf_id, port)); 1786 } 1787 /* 1788 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1789 */ 1790 /* temp code */ 1791 if (how_indx < sizeof(asoc->cookie_how)) 1792 asoc->cookie_how[how_indx] = 12; 1793 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1794 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1795 1796 *sac_assoc_id = sctp_get_associd(stcb); 1797 /* notify upper layer */ 1798 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1799 atomic_add_int(&stcb->asoc.refcnt, 1); 1800 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1801 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1802 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1803 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1804 } 1805 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1806 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1807 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1808 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1809 } 1810 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1811 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1812 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1813 stcb->sctp_ep, stcb, asoc->primary_destination); 1814 1815 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1816 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1817 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1818 } 1819 asoc->pre_open_streams = 1820 ntohs(initack_cp->init.num_outbound_streams); 1821 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1822 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1823 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1824 1825 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1826 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1827 1828 asoc->str_reset_seq_in = asoc->init_seq_number; 1829 1830 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1831 if (asoc->mapping_array) { 1832 memset(asoc->mapping_array, 0, 1833 asoc->mapping_array_size); 1834 } 1835 /* EY 05/13/08 - nr_sack version of the above if statement */ 1836 if (asoc->nr_mapping_array && SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) 1837 && asoc->peer_supports_nr_sack) { 1838 memset(asoc->nr_mapping_array, 0, 1839 asoc->nr_mapping_array_size); 1840 } 1841 SCTP_TCB_UNLOCK(stcb); 1842 SCTP_INP_INFO_WLOCK(); 1843 SCTP_INP_WLOCK(stcb->sctp_ep); 1844 SCTP_TCB_LOCK(stcb); 1845 atomic_add_int(&stcb->asoc.refcnt, -1); 1846 /* send up all the data */ 1847 SCTP_TCB_SEND_LOCK(stcb); 1848 1849 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1850 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1851 stcb->asoc.strmout[i].stream_no = i; 1852 stcb->asoc.strmout[i].next_sequence_sent = 0; 1853 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1854 } 1855 /* process the INIT-ACK info (my info) */ 1856 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1857 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1858 1859 /* pull from vtag hash */ 1860 LIST_REMOVE(stcb, sctp_asocs); 1861 /* re-insert to new vtag position */ 1862 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1863 SCTP_BASE_INFO(hashasocmark))]; 1864 /* 1865 * put it in the bucket in the vtag hash of assoc's for the 1866 * system 1867 */ 1868 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1869 1870 /* process the INIT info (peer's info) */ 1871 SCTP_TCB_SEND_UNLOCK(stcb); 1872 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1873 SCTP_INP_INFO_WUNLOCK(); 1874 1875 retval = sctp_process_init(init_cp, stcb, net); 1876 if (retval < 0) { 1877 if (how_indx < sizeof(asoc->cookie_how)) 1878 asoc->cookie_how[how_indx] = 13; 1879 1880 return (NULL); 1881 } 1882 /* 1883 * since we did not send a HB make sure we don't double 1884 * things 1885 */ 1886 net->hb_responded = 1; 1887 1888 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1889 init_offset + sizeof(struct sctp_init_chunk), 1890 initack_offset, sh, init_src)) { 1891 if (how_indx < sizeof(asoc->cookie_how)) 1892 asoc->cookie_how[how_indx] = 14; 1893 1894 return (NULL); 1895 } 1896 /* respond with a COOKIE-ACK */ 1897 sctp_stop_all_cookie_timers(stcb); 1898 sctp_toss_old_cookies(stcb, asoc); 1899 sctp_send_cookie_ack(stcb); 1900 if (how_indx < sizeof(asoc->cookie_how)) 1901 asoc->cookie_how[how_indx] = 15; 1902 1903 return (stcb); 1904 } 1905 if (how_indx < sizeof(asoc->cookie_how)) 1906 asoc->cookie_how[how_indx] = 16; 1907 /* all other cases... */ 1908 return (NULL); 1909 } 1910 1911 1912 /* 1913 * handle a state cookie for a new association m: input packet mbuf chain-- 1914 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1915 * and the cookie signature does not exist offset: offset into mbuf to the 1916 * cookie-echo chunk length: length of the cookie chunk to: where the init 1917 * was from returns a new TCB 1918 */ 1919 struct sctp_tcb * 1920 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1921 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1922 struct sctp_inpcb *inp, struct sctp_nets **netp, 1923 struct sockaddr *init_src, int *notification, 1924 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1925 uint32_t vrf_id, uint16_t port) 1926 { 1927 struct sctp_tcb *stcb; 1928 struct sctp_init_chunk *init_cp, init_buf; 1929 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1930 struct sockaddr_storage sa_store; 1931 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1932 struct sockaddr_in *sin; 1933 struct sockaddr_in6 *sin6; 1934 struct sctp_association *asoc; 1935 int chk_length; 1936 int init_offset, initack_offset, initack_limit; 1937 int retval; 1938 int error = 0; 1939 uint32_t old_tag; 1940 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1941 1942 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1943 struct socket *so; 1944 1945 so = SCTP_INP_SO(inp); 1946 #endif 1947 1948 /* 1949 * find and validate the INIT chunk in the cookie (peer's info) the 1950 * INIT should start after the cookie-echo header struct (chunk 1951 * header, state cookie header struct) 1952 */ 1953 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1954 init_cp = (struct sctp_init_chunk *) 1955 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1956 (uint8_t *) & init_buf); 1957 if (init_cp == NULL) { 1958 /* could not pull a INIT chunk in cookie */ 1959 SCTPDBG(SCTP_DEBUG_INPUT1, 1960 "process_cookie_new: could not pull INIT chunk hdr\n"); 1961 return (NULL); 1962 } 1963 chk_length = ntohs(init_cp->ch.chunk_length); 1964 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1965 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1966 return (NULL); 1967 } 1968 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1969 /* 1970 * find and validate the INIT-ACK chunk in the cookie (my info) the 1971 * INIT-ACK follows the INIT chunk 1972 */ 1973 initack_cp = (struct sctp_init_ack_chunk *) 1974 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1975 (uint8_t *) & initack_buf); 1976 if (initack_cp == NULL) { 1977 /* could not pull INIT-ACK chunk in cookie */ 1978 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1979 return (NULL); 1980 } 1981 chk_length = ntohs(initack_cp->ch.chunk_length); 1982 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1983 return (NULL); 1984 } 1985 /* 1986 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1987 * "initack_limit" value. This is because the chk_length field 1988 * includes the length of the cookie, but the cookie is omitted when 1989 * the INIT and INIT_ACK are tacked onto the cookie... 1990 */ 1991 initack_limit = offset + cookie_len; 1992 1993 /* 1994 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1995 * and popluate 1996 */ 1997 1998 /* 1999 * Here we do a trick, we set in NULL for the proc/thread argument. 2000 * We do this since in effect we only use the p argument when the 2001 * socket is unbound and we must do an implicit bind. Since we are 2002 * getting a cookie, we cannot be unbound. 2003 */ 2004 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 2005 ntohl(initack_cp->init.initiate_tag), vrf_id, 2006 (struct thread *)NULL 2007 ); 2008 if (stcb == NULL) { 2009 struct mbuf *op_err; 2010 2011 /* memory problem? */ 2012 SCTPDBG(SCTP_DEBUG_INPUT1, 2013 "process_cookie_new: no room for another TCB!\n"); 2014 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2015 2016 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2017 sh, op_err, vrf_id, port); 2018 return (NULL); 2019 } 2020 /* get the correct sctp_nets */ 2021 if (netp) 2022 *netp = sctp_findnet(stcb, init_src); 2023 2024 asoc = &stcb->asoc; 2025 /* get scope variables out of cookie */ 2026 asoc->ipv4_local_scope = cookie->ipv4_scope; 2027 asoc->site_scope = cookie->site_scope; 2028 asoc->local_scope = cookie->local_scope; 2029 asoc->loopback_scope = cookie->loopback_scope; 2030 2031 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2032 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2033 struct mbuf *op_err; 2034 2035 /* 2036 * Houston we have a problem. The EP changed while the 2037 * cookie was in flight. Only recourse is to abort the 2038 * association. 2039 */ 2040 atomic_add_int(&stcb->asoc.refcnt, 1); 2041 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2042 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2043 sh, op_err, vrf_id, port); 2044 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2045 SCTP_TCB_UNLOCK(stcb); 2046 SCTP_SOCKET_LOCK(so, 1); 2047 SCTP_TCB_LOCK(stcb); 2048 #endif 2049 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2050 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2051 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2052 SCTP_SOCKET_UNLOCK(so, 1); 2053 #endif 2054 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2055 return (NULL); 2056 } 2057 /* process the INIT-ACK info (my info) */ 2058 old_tag = asoc->my_vtag; 2059 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2060 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2061 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2062 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2063 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2064 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2065 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2066 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2067 asoc->str_reset_seq_in = asoc->init_seq_number; 2068 2069 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2070 2071 /* process the INIT info (peer's info) */ 2072 if (netp) 2073 retval = sctp_process_init(init_cp, stcb, *netp); 2074 else 2075 retval = 0; 2076 if (retval < 0) { 2077 atomic_add_int(&stcb->asoc.refcnt, 1); 2078 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2079 SCTP_TCB_UNLOCK(stcb); 2080 SCTP_SOCKET_LOCK(so, 1); 2081 SCTP_TCB_LOCK(stcb); 2082 #endif 2083 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2085 SCTP_SOCKET_UNLOCK(so, 1); 2086 #endif 2087 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2088 return (NULL); 2089 } 2090 /* load all addresses */ 2091 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2092 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2093 init_src)) { 2094 atomic_add_int(&stcb->asoc.refcnt, 1); 2095 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2096 SCTP_TCB_UNLOCK(stcb); 2097 SCTP_SOCKET_LOCK(so, 1); 2098 SCTP_TCB_LOCK(stcb); 2099 #endif 2100 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2101 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2102 SCTP_SOCKET_UNLOCK(so, 1); 2103 #endif 2104 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2105 return (NULL); 2106 } 2107 /* 2108 * verify any preceding AUTH chunk that was skipped 2109 */ 2110 /* pull the local authentication parameters from the cookie/init-ack */ 2111 sctp_auth_get_cookie_params(stcb, m, 2112 initack_offset + sizeof(struct sctp_init_ack_chunk), 2113 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2114 if (auth_skipped) { 2115 struct sctp_auth_chunk *auth; 2116 2117 auth = (struct sctp_auth_chunk *) 2118 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2119 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2120 /* auth HMAC failed, dump the assoc and packet */ 2121 SCTPDBG(SCTP_DEBUG_AUTH1, 2122 "COOKIE-ECHO: AUTH failed\n"); 2123 atomic_add_int(&stcb->asoc.refcnt, 1); 2124 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2125 SCTP_TCB_UNLOCK(stcb); 2126 SCTP_SOCKET_LOCK(so, 1); 2127 SCTP_TCB_LOCK(stcb); 2128 #endif 2129 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2131 SCTP_SOCKET_UNLOCK(so, 1); 2132 #endif 2133 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2134 return (NULL); 2135 } else { 2136 /* remaining chunks checked... good to go */ 2137 stcb->asoc.authenticated = 1; 2138 } 2139 } 2140 /* update current state */ 2141 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2142 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2143 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2144 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2145 stcb->sctp_ep, stcb, asoc->primary_destination); 2146 } 2147 sctp_stop_all_cookie_timers(stcb); 2148 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2149 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2150 2151 /* 2152 * if we're doing ASCONFs, check to see if we have any new local 2153 * addresses that need to get added to the peer (eg. addresses 2154 * changed while cookie echo in flight). This needs to be done 2155 * after we go to the OPEN state to do the correct asconf 2156 * processing. else, make sure we have the correct addresses in our 2157 * lists 2158 */ 2159 2160 /* warning, we re-use sin, sin6, sa_store here! */ 2161 /* pull in local_address (our "from" address) */ 2162 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2163 /* source addr is IPv4 */ 2164 sin = (struct sockaddr_in *)initack_src; 2165 memset(sin, 0, sizeof(*sin)); 2166 sin->sin_family = AF_INET; 2167 sin->sin_len = sizeof(struct sockaddr_in); 2168 sin->sin_addr.s_addr = cookie->laddress[0]; 2169 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2170 /* source addr is IPv6 */ 2171 sin6 = (struct sockaddr_in6 *)initack_src; 2172 memset(sin6, 0, sizeof(*sin6)); 2173 sin6->sin6_family = AF_INET6; 2174 sin6->sin6_len = sizeof(struct sockaddr_in6); 2175 sin6->sin6_scope_id = cookie->scope_id; 2176 memcpy(&sin6->sin6_addr, cookie->laddress, 2177 sizeof(sin6->sin6_addr)); 2178 } else { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184 #endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2186 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188 #endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 2193 /* set up to notify upper layer */ 2194 *notification = SCTP_NOTIFY_ASSOC_UP; 2195 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2196 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2197 (inp->sctp_socket->so_qlimit == 0)) { 2198 /* 2199 * This is an endpoint that called connect() how it got a 2200 * cookie that is NEW is a bit of a mystery. It must be that 2201 * the INIT was sent, but before it got there.. a complete 2202 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2203 * should have went to the other code.. not here.. oh well.. 2204 * a bit of protection is worth having.. 2205 */ 2206 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2207 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209 SCTP_TCB_UNLOCK(stcb); 2210 SCTP_SOCKET_LOCK(so, 1); 2211 SCTP_TCB_LOCK(stcb); 2212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2213 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2214 SCTP_SOCKET_UNLOCK(so, 1); 2215 return (NULL); 2216 } 2217 #endif 2218 soisconnected(stcb->sctp_socket); 2219 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2220 SCTP_SOCKET_UNLOCK(so, 1); 2221 #endif 2222 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2223 (inp->sctp_socket->so_qlimit)) { 2224 /* 2225 * We don't want to do anything with this one. Since it is 2226 * the listening guy. The timer will get started for 2227 * accepted connections in the caller. 2228 */ 2229 ; 2230 } 2231 /* since we did not send a HB make sure we don't double things */ 2232 if ((netp) && (*netp)) 2233 (*netp)->hb_responded = 1; 2234 2235 if (stcb->asoc.sctp_autoclose_ticks && 2236 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2237 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2238 } 2239 /* calculate the RTT */ 2240 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2241 if ((netp) && (*netp)) { 2242 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2243 &cookie->time_entered, sctp_align_unsafe_makecopy); 2244 } 2245 /* respond with a COOKIE-ACK */ 2246 sctp_send_cookie_ack(stcb); 2247 2248 /* 2249 * check the address lists for any ASCONFs that need to be sent 2250 * AFTER the cookie-ack is sent 2251 */ 2252 sctp_check_address_list(stcb, m, 2253 initack_offset + sizeof(struct sctp_init_ack_chunk), 2254 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2255 initack_src, cookie->local_scope, cookie->site_scope, 2256 cookie->ipv4_scope, cookie->loopback_scope); 2257 2258 2259 return (stcb); 2260 } 2261 2262 /* 2263 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2264 * we NEED to make sure we are not already using the vtag. If so we 2265 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2266 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2267 SCTP_BASE_INFO(hashasocmark))]; 2268 LIST_FOREACH(stcb, head, sctp_asocs) { 2269 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2270 -- SEND ABORT - TRY AGAIN -- 2271 } 2272 } 2273 */ 2274 2275 /* 2276 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2277 * existing (non-NULL) TCB 2278 */ 2279 static struct mbuf * 2280 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2281 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2282 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2283 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2284 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2285 { 2286 struct sctp_state_cookie *cookie; 2287 struct sockaddr_in6 sin6; 2288 struct sockaddr_in sin; 2289 struct sctp_tcb *l_stcb = *stcb; 2290 struct sctp_inpcb *l_inp; 2291 struct sockaddr *to; 2292 sctp_assoc_t sac_restart_id; 2293 struct sctp_pcb *ep; 2294 struct mbuf *m_sig; 2295 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2296 uint8_t *sig; 2297 uint8_t cookie_ok = 0; 2298 unsigned int size_of_pkt, sig_offset, cookie_offset; 2299 unsigned int cookie_len; 2300 struct timeval now; 2301 struct timeval time_expires; 2302 struct sockaddr_storage dest_store; 2303 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2304 struct ip *iph; 2305 int notification = 0; 2306 struct sctp_nets *netl; 2307 int had_a_existing_tcb = 0; 2308 2309 SCTPDBG(SCTP_DEBUG_INPUT2, 2310 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2311 2312 if (inp_p == NULL) { 2313 return (NULL); 2314 } 2315 /* First get the destination address setup too. */ 2316 iph = mtod(m, struct ip *); 2317 switch (iph->ip_v) { 2318 case IPVERSION: 2319 { 2320 /* its IPv4 */ 2321 struct sockaddr_in *lsin; 2322 2323 lsin = (struct sockaddr_in *)(localep_sa); 2324 memset(lsin, 0, sizeof(*lsin)); 2325 lsin->sin_family = AF_INET; 2326 lsin->sin_len = sizeof(*lsin); 2327 lsin->sin_port = sh->dest_port; 2328 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2329 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2330 break; 2331 } 2332 #ifdef INET6 2333 case IPV6_VERSION >> 4: 2334 { 2335 /* its IPv6 */ 2336 struct ip6_hdr *ip6; 2337 struct sockaddr_in6 *lsin6; 2338 2339 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2340 memset(lsin6, 0, sizeof(*lsin6)); 2341 lsin6->sin6_family = AF_INET6; 2342 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2343 ip6 = mtod(m, struct ip6_hdr *); 2344 lsin6->sin6_port = sh->dest_port; 2345 lsin6->sin6_addr = ip6->ip6_dst; 2346 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2347 break; 2348 } 2349 #endif 2350 default: 2351 return (NULL); 2352 } 2353 2354 cookie = &cp->cookie; 2355 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2356 cookie_len = ntohs(cp->ch.chunk_length); 2357 2358 if ((cookie->peerport != sh->src_port) && 2359 (cookie->myport != sh->dest_port) && 2360 (cookie->my_vtag != sh->v_tag)) { 2361 /* 2362 * invalid ports or bad tag. Note that we always leave the 2363 * v_tag in the header in network order and when we stored 2364 * it in the my_vtag slot we also left it in network order. 2365 * This maintains the match even though it may be in the 2366 * opposite byte order of the machine :-> 2367 */ 2368 return (NULL); 2369 } 2370 if (cookie_len > size_of_pkt || 2371 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2372 sizeof(struct sctp_init_chunk) + 2373 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2374 /* cookie too long! or too small */ 2375 return (NULL); 2376 } 2377 /* 2378 * split off the signature into its own mbuf (since it should not be 2379 * calculated in the sctp_hmac_m() call). 2380 */ 2381 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2382 if (sig_offset > size_of_pkt) { 2383 /* packet not correct size! */ 2384 /* XXX this may already be accounted for earlier... */ 2385 return (NULL); 2386 } 2387 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2388 if (m_sig == NULL) { 2389 /* out of memory or ?? */ 2390 return (NULL); 2391 } 2392 #ifdef SCTP_MBUF_LOGGING 2393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2394 struct mbuf *mat; 2395 2396 mat = m_sig; 2397 while (mat) { 2398 if (SCTP_BUF_IS_EXTENDED(mat)) { 2399 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2400 } 2401 mat = SCTP_BUF_NEXT(mat); 2402 } 2403 } 2404 #endif 2405 2406 /* 2407 * compute the signature/digest for the cookie 2408 */ 2409 ep = &(*inp_p)->sctp_ep; 2410 l_inp = *inp_p; 2411 if (l_stcb) { 2412 SCTP_TCB_UNLOCK(l_stcb); 2413 } 2414 SCTP_INP_RLOCK(l_inp); 2415 if (l_stcb) { 2416 SCTP_TCB_LOCK(l_stcb); 2417 } 2418 /* which cookie is it? */ 2419 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2420 (ep->current_secret_number != ep->last_secret_number)) { 2421 /* it's the old cookie */ 2422 (void)sctp_hmac_m(SCTP_HMAC, 2423 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2424 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2425 } else { 2426 /* it's the current cookie */ 2427 (void)sctp_hmac_m(SCTP_HMAC, 2428 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2429 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2430 } 2431 /* get the signature */ 2432 SCTP_INP_RUNLOCK(l_inp); 2433 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2434 if (sig == NULL) { 2435 /* couldn't find signature */ 2436 sctp_m_freem(m_sig); 2437 return (NULL); 2438 } 2439 /* compare the received digest with the computed digest */ 2440 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2441 /* try the old cookie? */ 2442 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2443 (ep->current_secret_number != ep->last_secret_number)) { 2444 /* compute digest with old */ 2445 (void)sctp_hmac_m(SCTP_HMAC, 2446 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2447 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2448 /* compare */ 2449 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2450 cookie_ok = 1; 2451 } 2452 } else { 2453 cookie_ok = 1; 2454 } 2455 2456 /* 2457 * Now before we continue we must reconstruct our mbuf so that 2458 * normal processing of any other chunks will work. 2459 */ 2460 { 2461 struct mbuf *m_at; 2462 2463 m_at = m; 2464 while (SCTP_BUF_NEXT(m_at) != NULL) { 2465 m_at = SCTP_BUF_NEXT(m_at); 2466 } 2467 SCTP_BUF_NEXT(m_at) = m_sig; 2468 } 2469 2470 if (cookie_ok == 0) { 2471 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2472 SCTPDBG(SCTP_DEBUG_INPUT2, 2473 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2474 (uint32_t) offset, cookie_offset, sig_offset); 2475 return (NULL); 2476 } 2477 /* 2478 * check the cookie timestamps to be sure it's not stale 2479 */ 2480 (void)SCTP_GETTIME_TIMEVAL(&now); 2481 /* Expire time is in Ticks, so we convert to seconds */ 2482 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2483 time_expires.tv_usec = cookie->time_entered.tv_usec; 2484 /* 2485 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2486 * is undefined. 2487 */ 2488 if (timevalcmp(&now, &time_expires, >)) { 2489 /* cookie is stale! */ 2490 struct mbuf *op_err; 2491 struct sctp_stale_cookie_msg *scm; 2492 uint32_t tim; 2493 2494 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2495 0, M_DONTWAIT, 1, MT_DATA); 2496 if (op_err == NULL) { 2497 /* FOOBAR */ 2498 return (NULL); 2499 } 2500 /* Set the len */ 2501 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2502 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2503 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2504 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2505 (sizeof(uint32_t)))); 2506 /* seconds to usec */ 2507 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2508 /* add in usec */ 2509 if (tim == 0) 2510 tim = now.tv_usec - cookie->time_entered.tv_usec; 2511 scm->time_usec = htonl(tim); 2512 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2513 vrf_id, port); 2514 return (NULL); 2515 } 2516 /* 2517 * Now we must see with the lookup address if we have an existing 2518 * asoc. This will only happen if we were in the COOKIE-WAIT state 2519 * and a INIT collided with us and somewhere the peer sent the 2520 * cookie on another address besides the single address our assoc 2521 * had for him. In this case we will have one of the tie-tags set at 2522 * least AND the address field in the cookie can be used to look it 2523 * up. 2524 */ 2525 to = NULL; 2526 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2527 memset(&sin6, 0, sizeof(sin6)); 2528 sin6.sin6_family = AF_INET6; 2529 sin6.sin6_len = sizeof(sin6); 2530 sin6.sin6_port = sh->src_port; 2531 sin6.sin6_scope_id = cookie->scope_id; 2532 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2533 sizeof(sin6.sin6_addr.s6_addr)); 2534 to = (struct sockaddr *)&sin6; 2535 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2536 memset(&sin, 0, sizeof(sin)); 2537 sin.sin_family = AF_INET; 2538 sin.sin_len = sizeof(sin); 2539 sin.sin_port = sh->src_port; 2540 sin.sin_addr.s_addr = cookie->address[0]; 2541 to = (struct sockaddr *)&sin; 2542 } else { 2543 /* This should not happen */ 2544 return (NULL); 2545 } 2546 if ((*stcb == NULL) && to) { 2547 /* Yep, lets check */ 2548 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2549 if (*stcb == NULL) { 2550 /* 2551 * We should have only got back the same inp. If we 2552 * got back a different ep we have a problem. The 2553 * original findep got back l_inp and now 2554 */ 2555 if (l_inp != *inp_p) { 2556 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2557 } 2558 } else { 2559 if (*locked_tcb == NULL) { 2560 /* 2561 * In this case we found the assoc only 2562 * after we locked the create lock. This 2563 * means we are in a colliding case and we 2564 * must make sure that we unlock the tcb if 2565 * its one of the cases where we throw away 2566 * the incoming packets. 2567 */ 2568 *locked_tcb = *stcb; 2569 2570 /* 2571 * We must also increment the inp ref count 2572 * since the ref_count flags was set when we 2573 * did not find the TCB, now we found it 2574 * which reduces the refcount.. we must 2575 * raise it back out to balance it all :-) 2576 */ 2577 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2578 if ((*stcb)->sctp_ep != l_inp) { 2579 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2580 (*stcb)->sctp_ep, l_inp); 2581 } 2582 } 2583 } 2584 } 2585 if (to == NULL) { 2586 return (NULL); 2587 } 2588 cookie_len -= SCTP_SIGNATURE_SIZE; 2589 if (*stcb == NULL) { 2590 /* this is the "normal" case... get a new TCB */ 2591 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2592 cookie_len, *inp_p, netp, to, ¬ification, 2593 auth_skipped, auth_offset, auth_len, vrf_id, port); 2594 } else { 2595 /* this is abnormal... cookie-echo on existing TCB */ 2596 had_a_existing_tcb = 1; 2597 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2598 cookie, cookie_len, *inp_p, *stcb, netp, to, 2599 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2600 } 2601 2602 if (*stcb == NULL) { 2603 /* still no TCB... must be bad cookie-echo */ 2604 return (NULL); 2605 } 2606 /* 2607 * Ok, we built an association so confirm the address we sent the 2608 * INIT-ACK to. 2609 */ 2610 netl = sctp_findnet(*stcb, to); 2611 /* 2612 * This code should in theory NOT run but 2613 */ 2614 if (netl == NULL) { 2615 /* TSNH! Huh, why do I need to add this address here? */ 2616 int ret; 2617 2618 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2619 SCTP_IN_COOKIE_PROC); 2620 netl = sctp_findnet(*stcb, to); 2621 } 2622 if (netl) { 2623 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2624 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2625 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2626 netl); 2627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2628 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2629 } 2630 } 2631 if (*stcb) { 2632 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2633 *stcb, NULL); 2634 } 2635 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2636 if (!had_a_existing_tcb || 2637 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2638 /* 2639 * If we have a NEW cookie or the connect never 2640 * reached the connected state during collision we 2641 * must do the TCP accept thing. 2642 */ 2643 struct socket *so, *oso; 2644 struct sctp_inpcb *inp; 2645 2646 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2647 /* 2648 * For a restart we will keep the same 2649 * socket, no need to do anything. I THINK!! 2650 */ 2651 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2652 return (m); 2653 } 2654 oso = (*inp_p)->sctp_socket; 2655 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2656 SCTP_TCB_UNLOCK((*stcb)); 2657 so = sonewconn(oso, 0 2658 ); 2659 SCTP_TCB_LOCK((*stcb)); 2660 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2661 2662 if (so == NULL) { 2663 struct mbuf *op_err; 2664 2665 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2666 struct socket *pcb_so; 2667 2668 #endif 2669 /* Too many sockets */ 2670 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2671 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2672 sctp_abort_association(*inp_p, NULL, m, iphlen, 2673 sh, op_err, vrf_id, port); 2674 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2675 pcb_so = SCTP_INP_SO(*inp_p); 2676 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2677 SCTP_TCB_UNLOCK((*stcb)); 2678 SCTP_SOCKET_LOCK(pcb_so, 1); 2679 SCTP_TCB_LOCK((*stcb)); 2680 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2681 #endif 2682 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2683 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2684 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2685 #endif 2686 return (NULL); 2687 } 2688 inp = (struct sctp_inpcb *)so->so_pcb; 2689 SCTP_INP_INCR_REF(inp); 2690 /* 2691 * We add the unbound flag here so that if we get an 2692 * soabort() before we get the move_pcb done, we 2693 * will properly cleanup. 2694 */ 2695 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2696 SCTP_PCB_FLAGS_CONNECTED | 2697 SCTP_PCB_FLAGS_IN_TCPPOOL | 2698 SCTP_PCB_FLAGS_UNBOUND | 2699 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2700 SCTP_PCB_FLAGS_DONT_WAKE); 2701 inp->sctp_features = (*inp_p)->sctp_features; 2702 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2703 inp->sctp_socket = so; 2704 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2705 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2706 inp->sctp_context = (*inp_p)->sctp_context; 2707 inp->inp_starting_point_for_iterator = NULL; 2708 /* 2709 * copy in the authentication parameters from the 2710 * original endpoint 2711 */ 2712 if (inp->sctp_ep.local_hmacs) 2713 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2714 inp->sctp_ep.local_hmacs = 2715 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2716 if (inp->sctp_ep.local_auth_chunks) 2717 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2718 inp->sctp_ep.local_auth_chunks = 2719 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2720 2721 /* 2722 * Now we must move it from one hash table to 2723 * another and get the tcb in the right place. 2724 */ 2725 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2726 2727 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2728 SCTP_TCB_UNLOCK((*stcb)); 2729 2730 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2731 0); 2732 SCTP_TCB_LOCK((*stcb)); 2733 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2734 2735 2736 /* 2737 * now we must check to see if we were aborted while 2738 * the move was going on and the lock/unlock 2739 * happened. 2740 */ 2741 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2742 /* 2743 * yep it was, we leave the assoc attached 2744 * to the socket since the sctp_inpcb_free() 2745 * call will send an abort for us. 2746 */ 2747 SCTP_INP_DECR_REF(inp); 2748 return (NULL); 2749 } 2750 SCTP_INP_DECR_REF(inp); 2751 /* Switch over to the new guy */ 2752 *inp_p = inp; 2753 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2754 2755 /* 2756 * Pull it from the incomplete queue and wake the 2757 * guy 2758 */ 2759 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 SCTP_SOCKET_LOCK(so, 1); 2763 #endif 2764 soisconnected(so); 2765 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2766 SCTP_TCB_LOCK((*stcb)); 2767 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2768 SCTP_SOCKET_UNLOCK(so, 1); 2769 #endif 2770 return (m); 2771 } 2772 } 2773 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2774 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2775 } 2776 return (m); 2777 } 2778 2779 static void 2780 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2781 struct sctp_tcb *stcb, struct sctp_nets *net) 2782 { 2783 /* cp must not be used, others call this without a c-ack :-) */ 2784 struct sctp_association *asoc; 2785 2786 SCTPDBG(SCTP_DEBUG_INPUT2, 2787 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2788 if (stcb == NULL) 2789 return; 2790 2791 asoc = &stcb->asoc; 2792 2793 sctp_stop_all_cookie_timers(stcb); 2794 /* process according to association state */ 2795 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2796 /* state change only needed when I am in right state */ 2797 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2798 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2799 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2800 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2801 stcb->sctp_ep, stcb, asoc->primary_destination); 2802 2803 } 2804 /* update RTO */ 2805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2806 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2807 if (asoc->overall_error_count == 0) { 2808 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2809 &asoc->time_entered, sctp_align_safe_nocopy); 2810 } 2811 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2812 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2813 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2814 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2815 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2816 struct socket *so; 2817 2818 #endif 2819 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2820 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2821 so = SCTP_INP_SO(stcb->sctp_ep); 2822 atomic_add_int(&stcb->asoc.refcnt, 1); 2823 SCTP_TCB_UNLOCK(stcb); 2824 SCTP_SOCKET_LOCK(so, 1); 2825 SCTP_TCB_LOCK(stcb); 2826 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2827 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2828 SCTP_SOCKET_UNLOCK(so, 1); 2829 return; 2830 } 2831 #endif 2832 soisconnected(stcb->sctp_socket); 2833 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2834 SCTP_SOCKET_UNLOCK(so, 1); 2835 #endif 2836 } 2837 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2838 stcb, net); 2839 /* 2840 * since we did not send a HB make sure we don't double 2841 * things 2842 */ 2843 net->hb_responded = 1; 2844 2845 if (stcb->asoc.sctp_autoclose_ticks && 2846 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2847 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2848 stcb->sctp_ep, stcb, NULL); 2849 } 2850 /* 2851 * send ASCONF if parameters are pending and ASCONFs are 2852 * allowed (eg. addresses changed when init/cookie echo were 2853 * in flight) 2854 */ 2855 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2856 (stcb->asoc.peer_supports_asconf) && 2857 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2858 #ifdef SCTP_TIMER_BASED_ASCONF 2859 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2860 stcb->sctp_ep, stcb, 2861 stcb->asoc.primary_destination); 2862 #else 2863 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2864 SCTP_ADDR_NOT_LOCKED); 2865 #endif 2866 } 2867 } 2868 /* Toss the cookie if I can */ 2869 sctp_toss_old_cookies(stcb, asoc); 2870 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2871 /* Restart the timer if we have pending data */ 2872 struct sctp_tmit_chunk *chk; 2873 2874 chk = TAILQ_FIRST(&asoc->sent_queue); 2875 if (chk) { 2876 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2877 stcb, chk->whoTo); 2878 } 2879 } 2880 } 2881 2882 static void 2883 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2884 struct sctp_tcb *stcb) 2885 { 2886 struct sctp_nets *net; 2887 struct sctp_tmit_chunk *lchk; 2888 uint32_t tsn; 2889 2890 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2891 return; 2892 } 2893 SCTP_STAT_INCR(sctps_recvecne); 2894 tsn = ntohl(cp->tsn); 2895 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2896 /* Also we make sure we disable the nonce_wait */ 2897 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2898 if (lchk == NULL) { 2899 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2900 } else { 2901 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2902 } 2903 stcb->asoc.nonce_wait_for_ecne = 0; 2904 stcb->asoc.nonce_sum_check = 0; 2905 2906 /* Find where it was sent, if possible */ 2907 net = NULL; 2908 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2909 while (lchk) { 2910 if (lchk->rec.data.TSN_seq == tsn) { 2911 net = lchk->whoTo; 2912 break; 2913 } 2914 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2915 break; 2916 lchk = TAILQ_NEXT(lchk, sctp_next); 2917 } 2918 if (net == NULL) 2919 /* default is we use the primary */ 2920 net = stcb->asoc.primary_destination; 2921 2922 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2923 /* 2924 * JRS - Use the congestion control given in the pluggable 2925 * CC module 2926 */ 2927 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2928 /* 2929 * we reduce once every RTT. So we will only lower cwnd at 2930 * the next sending seq i.e. the resync_tsn. 2931 */ 2932 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2933 } 2934 /* 2935 * We always send a CWR this way if our previous one was lost our 2936 * peer will get an update, or if it is not time again to reduce we 2937 * still get the cwr to the peer. 2938 */ 2939 sctp_send_cwr(stcb, net, tsn); 2940 } 2941 2942 static void 2943 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2944 { 2945 /* 2946 * Here we get a CWR from the peer. We must look in the outqueue and 2947 * make sure that we have a covered ECNE in teh control chunk part. 2948 * If so remove it. 2949 */ 2950 struct sctp_tmit_chunk *chk; 2951 struct sctp_ecne_chunk *ecne; 2952 2953 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2954 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2955 continue; 2956 } 2957 /* 2958 * Look for and remove if it is the right TSN. Since there 2959 * is only ONE ECNE on the control queue at any one time we 2960 * don't need to worry about more than one! 2961 */ 2962 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2963 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2964 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2965 /* this covers this ECNE, we can remove it */ 2966 stcb->asoc.ecn_echo_cnt_onq--; 2967 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2968 sctp_next); 2969 if (chk->data) { 2970 sctp_m_freem(chk->data); 2971 chk->data = NULL; 2972 } 2973 stcb->asoc.ctrl_queue_cnt--; 2974 sctp_free_a_chunk(stcb, chk); 2975 break; 2976 } 2977 } 2978 } 2979 2980 static void 2981 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2982 struct sctp_tcb *stcb, struct sctp_nets *net) 2983 { 2984 struct sctp_association *asoc; 2985 2986 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2987 struct socket *so; 2988 2989 #endif 2990 2991 SCTPDBG(SCTP_DEBUG_INPUT2, 2992 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2993 if (stcb == NULL) 2994 return; 2995 2996 asoc = &stcb->asoc; 2997 /* process according to association state */ 2998 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2999 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3000 SCTPDBG(SCTP_DEBUG_INPUT2, 3001 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3002 SCTP_TCB_UNLOCK(stcb); 3003 return; 3004 } 3005 /* notify upper layer protocol */ 3006 if (stcb->sctp_socket) { 3007 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3008 /* are the queues empty? they should be */ 3009 if (!TAILQ_EMPTY(&asoc->send_queue) || 3010 !TAILQ_EMPTY(&asoc->sent_queue) || 3011 !TAILQ_EMPTY(&asoc->out_wheel)) { 3012 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3013 } 3014 } 3015 /* stop the timer */ 3016 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3017 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3018 /* free the TCB */ 3019 SCTPDBG(SCTP_DEBUG_INPUT2, 3020 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3021 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3022 so = SCTP_INP_SO(stcb->sctp_ep); 3023 atomic_add_int(&stcb->asoc.refcnt, 1); 3024 SCTP_TCB_UNLOCK(stcb); 3025 SCTP_SOCKET_LOCK(so, 1); 3026 SCTP_TCB_LOCK(stcb); 3027 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3028 #endif 3029 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3030 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3031 SCTP_SOCKET_UNLOCK(so, 1); 3032 #endif 3033 return; 3034 } 3035 3036 static int 3037 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3038 struct sctp_nets *net, uint8_t flg) 3039 { 3040 switch (desc->chunk_type) { 3041 case SCTP_DATA: 3042 /* find the tsn to resend (possibly */ 3043 { 3044 uint32_t tsn; 3045 struct sctp_tmit_chunk *tp1; 3046 3047 tsn = ntohl(desc->tsn_ifany); 3048 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3049 while (tp1) { 3050 if (tp1->rec.data.TSN_seq == tsn) { 3051 /* found it */ 3052 break; 3053 } 3054 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3055 MAX_TSN)) { 3056 /* not found */ 3057 tp1 = NULL; 3058 break; 3059 } 3060 tp1 = TAILQ_NEXT(tp1, sctp_next); 3061 } 3062 if (tp1 == NULL) { 3063 /* 3064 * Do it the other way , aka without paying 3065 * attention to queue seq order. 3066 */ 3067 SCTP_STAT_INCR(sctps_pdrpdnfnd); 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 tp1 = TAILQ_NEXT(tp1, sctp_next); 3075 } 3076 } 3077 if (tp1 == NULL) { 3078 SCTP_STAT_INCR(sctps_pdrptsnnf); 3079 } 3080 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3081 uint8_t *ddp; 3082 3083 if ((stcb->asoc.peers_rwnd == 0) && 3084 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3085 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3086 return (0); 3087 } 3088 if (stcb->asoc.peers_rwnd == 0 && 3089 (flg & SCTP_FROM_MIDDLE_BOX)) { 3090 SCTP_STAT_INCR(sctps_pdrpdizrw); 3091 return (0); 3092 } 3093 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3094 sizeof(struct sctp_data_chunk)); 3095 { 3096 unsigned int iii; 3097 3098 for (iii = 0; iii < sizeof(desc->data_bytes); 3099 iii++) { 3100 if (ddp[iii] != desc->data_bytes[iii]) { 3101 SCTP_STAT_INCR(sctps_pdrpbadd); 3102 return (-1); 3103 } 3104 } 3105 } 3106 /* 3107 * We zero out the nonce so resync not 3108 * needed 3109 */ 3110 tp1->rec.data.ect_nonce = 0; 3111 3112 if (tp1->do_rtt) { 3113 /* 3114 * this guy had a RTO calculation 3115 * pending on it, cancel it 3116 */ 3117 tp1->do_rtt = 0; 3118 } 3119 SCTP_STAT_INCR(sctps_pdrpmark); 3120 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3121 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3122 tp1->sent = SCTP_DATAGRAM_RESEND; 3123 /* 3124 * mark it as if we were doing a FR, since 3125 * we will be getting gap ack reports behind 3126 * the info from the router. 3127 */ 3128 tp1->rec.data.doing_fast_retransmit = 1; 3129 /* 3130 * mark the tsn with what sequences can 3131 * cause a new FR. 3132 */ 3133 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3134 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3135 } else { 3136 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3137 } 3138 3139 /* restart the timer */ 3140 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3141 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3142 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3143 stcb, tp1->whoTo); 3144 3145 /* fix counts and things */ 3146 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3147 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3148 tp1->whoTo->flight_size, 3149 tp1->book_size, 3150 (uintptr_t) stcb, 3151 tp1->rec.data.TSN_seq); 3152 } 3153 sctp_flight_size_decrease(tp1); 3154 sctp_total_flight_decrease(stcb, tp1); 3155 } { 3156 /* audit code */ 3157 unsigned int audit; 3158 3159 audit = 0; 3160 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3161 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3162 audit++; 3163 } 3164 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3165 sctp_next) { 3166 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3167 audit++; 3168 } 3169 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3170 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3171 audit, stcb->asoc.sent_queue_retran_cnt); 3172 #ifndef SCTP_AUDITING_ENABLED 3173 stcb->asoc.sent_queue_retran_cnt = audit; 3174 #endif 3175 } 3176 } 3177 } 3178 break; 3179 case SCTP_ASCONF: 3180 { 3181 struct sctp_tmit_chunk *asconf; 3182 3183 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3184 sctp_next) { 3185 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3186 break; 3187 } 3188 } 3189 if (asconf) { 3190 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3191 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3192 asconf->sent = SCTP_DATAGRAM_RESEND; 3193 asconf->snd_count--; 3194 } 3195 } 3196 break; 3197 case SCTP_INITIATION: 3198 /* resend the INIT */ 3199 stcb->asoc.dropped_special_cnt++; 3200 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3201 /* 3202 * If we can get it in, in a few attempts we do 3203 * this, otherwise we let the timer fire. 3204 */ 3205 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3206 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3207 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3208 } 3209 break; 3210 case SCTP_SELECTIVE_ACK: 3211 /* resend the sack */ 3212 sctp_send_sack(stcb); 3213 break; 3214 /* EY for nr_sacks */ 3215 case SCTP_NR_SELECTIVE_ACK: 3216 sctp_send_nr_sack(stcb); /* EY resend the nr-sack */ 3217 break; 3218 case SCTP_HEARTBEAT_REQUEST: 3219 /* resend a demand HB */ 3220 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3221 /* 3222 * Only retransmit if we KNOW we wont destroy the 3223 * tcb 3224 */ 3225 (void)sctp_send_hb(stcb, 1, net); 3226 } 3227 break; 3228 case SCTP_SHUTDOWN: 3229 sctp_send_shutdown(stcb, net); 3230 break; 3231 case SCTP_SHUTDOWN_ACK: 3232 sctp_send_shutdown_ack(stcb, net); 3233 break; 3234 case SCTP_COOKIE_ECHO: 3235 { 3236 struct sctp_tmit_chunk *cookie; 3237 3238 cookie = NULL; 3239 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3240 sctp_next) { 3241 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3242 break; 3243 } 3244 } 3245 if (cookie) { 3246 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3247 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3248 cookie->sent = SCTP_DATAGRAM_RESEND; 3249 sctp_stop_all_cookie_timers(stcb); 3250 } 3251 } 3252 break; 3253 case SCTP_COOKIE_ACK: 3254 sctp_send_cookie_ack(stcb); 3255 break; 3256 case SCTP_ASCONF_ACK: 3257 /* resend last asconf ack */ 3258 sctp_send_asconf_ack(stcb); 3259 break; 3260 case SCTP_FORWARD_CUM_TSN: 3261 send_forward_tsn(stcb, &stcb->asoc); 3262 break; 3263 /* can't do anything with these */ 3264 case SCTP_PACKET_DROPPED: 3265 case SCTP_INITIATION_ACK: /* this should not happen */ 3266 case SCTP_HEARTBEAT_ACK: 3267 case SCTP_ABORT_ASSOCIATION: 3268 case SCTP_OPERATION_ERROR: 3269 case SCTP_SHUTDOWN_COMPLETE: 3270 case SCTP_ECN_ECHO: 3271 case SCTP_ECN_CWR: 3272 default: 3273 break; 3274 } 3275 return (0); 3276 } 3277 3278 void 3279 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3280 { 3281 int i; 3282 uint16_t temp; 3283 3284 /* 3285 * We set things to 0xffff since this is the last delivered sequence 3286 * and we will be sending in 0 after the reset. 3287 */ 3288 3289 if (number_entries) { 3290 for (i = 0; i < number_entries; i++) { 3291 temp = ntohs(list[i]); 3292 if (temp >= stcb->asoc.streamincnt) { 3293 continue; 3294 } 3295 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3296 } 3297 } else { 3298 list = NULL; 3299 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3300 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3301 } 3302 } 3303 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3304 } 3305 3306 static void 3307 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3308 { 3309 int i; 3310 3311 if (number_entries == 0) { 3312 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3313 stcb->asoc.strmout[i].next_sequence_sent = 0; 3314 } 3315 } else if (number_entries) { 3316 for (i = 0; i < number_entries; i++) { 3317 uint16_t temp; 3318 3319 temp = ntohs(list[i]); 3320 if (temp >= stcb->asoc.streamoutcnt) { 3321 /* no such stream */ 3322 continue; 3323 } 3324 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3325 } 3326 } 3327 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3328 } 3329 3330 3331 struct sctp_stream_reset_out_request * 3332 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3333 { 3334 struct sctp_association *asoc; 3335 struct sctp_stream_reset_out_req *req; 3336 struct sctp_stream_reset_out_request *r; 3337 struct sctp_tmit_chunk *chk; 3338 int len, clen; 3339 3340 asoc = &stcb->asoc; 3341 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3342 asoc->stream_reset_outstanding = 0; 3343 return (NULL); 3344 } 3345 if (stcb->asoc.str_reset == NULL) { 3346 asoc->stream_reset_outstanding = 0; 3347 return (NULL); 3348 } 3349 chk = stcb->asoc.str_reset; 3350 if (chk->data == NULL) { 3351 return (NULL); 3352 } 3353 if (bchk) { 3354 /* he wants a copy of the chk pointer */ 3355 *bchk = chk; 3356 } 3357 clen = chk->send_size; 3358 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3359 r = &req->sr_req; 3360 if (ntohl(r->request_seq) == seq) { 3361 /* found it */ 3362 return (r); 3363 } 3364 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3365 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3366 /* move to the next one, there can only be a max of two */ 3367 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3368 if (ntohl(r->request_seq) == seq) { 3369 return (r); 3370 } 3371 } 3372 /* that seq is not here */ 3373 return (NULL); 3374 } 3375 3376 static void 3377 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3378 { 3379 struct sctp_association *asoc; 3380 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3381 3382 if (stcb->asoc.str_reset == NULL) { 3383 return; 3384 } 3385 asoc = &stcb->asoc; 3386 3387 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3388 TAILQ_REMOVE(&asoc->control_send_queue, 3389 chk, 3390 sctp_next); 3391 if (chk->data) { 3392 sctp_m_freem(chk->data); 3393 chk->data = NULL; 3394 } 3395 asoc->ctrl_queue_cnt--; 3396 sctp_free_a_chunk(stcb, chk); 3397 /* sa_ignore NO_NULL_CHK */ 3398 stcb->asoc.str_reset = NULL; 3399 } 3400 3401 3402 static int 3403 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3404 uint32_t seq, uint32_t action, 3405 struct sctp_stream_reset_response *respin) 3406 { 3407 uint16_t type; 3408 int lparm_len; 3409 struct sctp_association *asoc = &stcb->asoc; 3410 struct sctp_tmit_chunk *chk; 3411 struct sctp_stream_reset_out_request *srparam; 3412 int number_entries; 3413 3414 if (asoc->stream_reset_outstanding == 0) { 3415 /* duplicate */ 3416 return (0); 3417 } 3418 if (seq == stcb->asoc.str_reset_seq_out) { 3419 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3420 if (srparam) { 3421 stcb->asoc.str_reset_seq_out++; 3422 type = ntohs(srparam->ph.param_type); 3423 lparm_len = ntohs(srparam->ph.param_length); 3424 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3425 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3426 asoc->stream_reset_out_is_outstanding = 0; 3427 if (asoc->stream_reset_outstanding) 3428 asoc->stream_reset_outstanding--; 3429 if (action == SCTP_STREAM_RESET_PERFORMED) { 3430 /* do it */ 3431 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3432 } else { 3433 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3434 } 3435 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3436 /* Answered my request */ 3437 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3438 if (asoc->stream_reset_outstanding) 3439 asoc->stream_reset_outstanding--; 3440 if (action != SCTP_STREAM_RESET_PERFORMED) { 3441 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3442 } 3443 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3444 /* Ok we now may have more streams */ 3445 if (action == SCTP_STREAM_RESET_PERFORMED) { 3446 /* Put the new streams into effect */ 3447 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3448 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3449 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3450 } else { 3451 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3452 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3453 } 3454 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3455 /** 3456 * a) Adopt the new in tsn. 3457 * b) reset the map 3458 * c) Adopt the new out-tsn 3459 */ 3460 struct sctp_stream_reset_response_tsn *resp; 3461 struct sctp_forward_tsn_chunk fwdtsn; 3462 int abort_flag = 0; 3463 3464 if (respin == NULL) { 3465 /* huh ? */ 3466 return (0); 3467 } 3468 if (action == SCTP_STREAM_RESET_PERFORMED) { 3469 resp = (struct sctp_stream_reset_response_tsn *)respin; 3470 asoc->stream_reset_outstanding--; 3471 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3472 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3473 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3474 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3475 if (abort_flag) { 3476 return (1); 3477 } 3478 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3479 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3480 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3481 } 3482 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3483 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3484 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3485 3486 /* 3487 * EY 05/13/08 - nr_sack: to keep 3488 * nr_mapping array be consistent 3489 * with mapping_array 3490 */ 3491 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3492 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3493 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.mapping_array_base_tsn; 3494 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3495 } 3496 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3497 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3498 3499 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3500 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3501 3502 } 3503 } 3504 /* get rid of the request and get the request flags */ 3505 if (asoc->stream_reset_outstanding == 0) { 3506 sctp_clean_up_stream_reset(stcb); 3507 } 3508 } 3509 } 3510 return (0); 3511 } 3512 3513 static void 3514 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3515 struct sctp_tmit_chunk *chk, 3516 struct sctp_stream_reset_in_request *req, int trunc) 3517 { 3518 uint32_t seq; 3519 int len, i; 3520 int number_entries; 3521 uint16_t temp; 3522 3523 /* 3524 * peer wants me to send a str-reset to him for my outgoing seq's if 3525 * seq_in is right. 3526 */ 3527 struct sctp_association *asoc = &stcb->asoc; 3528 3529 seq = ntohl(req->request_seq); 3530 if (asoc->str_reset_seq_in == seq) { 3531 if (trunc) { 3532 /* Can't do it, since they exceeded our buffer size */ 3533 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3534 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3535 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3536 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3537 len = ntohs(req->ph.param_length); 3538 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3539 for (i = 0; i < number_entries; i++) { 3540 temp = ntohs(req->list_of_streams[i]); 3541 req->list_of_streams[i] = temp; 3542 } 3543 /* move the reset action back one */ 3544 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3545 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3546 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3547 asoc->str_reset_seq_out, 3548 seq, (asoc->sending_seq - 1)); 3549 asoc->stream_reset_out_is_outstanding = 1; 3550 asoc->str_reset = chk; 3551 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3552 stcb->asoc.stream_reset_outstanding++; 3553 } else { 3554 /* Can't do it, since we have sent one out */ 3555 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3556 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3557 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3558 } 3559 asoc->str_reset_seq_in++; 3560 } else if (asoc->str_reset_seq_in - 1 == seq) { 3561 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3562 } else if (asoc->str_reset_seq_in - 2 == seq) { 3563 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3564 } else { 3565 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3566 } 3567 } 3568 3569 static int 3570 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3571 struct sctp_tmit_chunk *chk, 3572 struct sctp_stream_reset_tsn_request *req) 3573 { 3574 /* reset all in and out and update the tsn */ 3575 /* 3576 * A) reset my str-seq's on in and out. B) Select a receive next, 3577 * and set cum-ack to it. Also process this selected number as a 3578 * fwd-tsn as well. C) set in the response my next sending seq. 3579 */ 3580 struct sctp_forward_tsn_chunk fwdtsn; 3581 struct sctp_association *asoc = &stcb->asoc; 3582 int abort_flag = 0; 3583 uint32_t seq; 3584 3585 seq = ntohl(req->request_seq); 3586 if (asoc->str_reset_seq_in == seq) { 3587 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3588 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3589 fwdtsn.ch.chunk_flags = 0; 3590 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3591 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3592 if (abort_flag) { 3593 return (1); 3594 } 3595 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3596 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3597 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3598 } 3599 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3600 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3601 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3602 /* 3603 * EY 05/13/08 -nr_sack: to keep nr_mapping array consistent 3604 * with mapping array 3605 */ 3606 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3607 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3608 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3609 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3610 } 3611 atomic_add_int(&stcb->asoc.sending_seq, 1); 3612 /* save off historical data for retrans */ 3613 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3614 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3615 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3616 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3617 3618 sctp_add_stream_reset_result_tsn(chk, 3619 ntohl(req->request_seq), 3620 SCTP_STREAM_RESET_PERFORMED, 3621 stcb->asoc.sending_seq, 3622 stcb->asoc.mapping_array_base_tsn); 3623 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3624 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3625 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3626 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3627 3628 asoc->str_reset_seq_in++; 3629 } else if (asoc->str_reset_seq_in - 1 == seq) { 3630 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3631 stcb->asoc.last_sending_seq[0], 3632 stcb->asoc.last_base_tsnsent[0] 3633 ); 3634 } else if (asoc->str_reset_seq_in - 2 == seq) { 3635 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3636 stcb->asoc.last_sending_seq[1], 3637 stcb->asoc.last_base_tsnsent[1] 3638 ); 3639 } else { 3640 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3641 } 3642 return (0); 3643 } 3644 3645 static void 3646 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3647 struct sctp_tmit_chunk *chk, 3648 struct sctp_stream_reset_out_request *req, int trunc) 3649 { 3650 uint32_t seq, tsn; 3651 int number_entries, len; 3652 struct sctp_association *asoc = &stcb->asoc; 3653 3654 seq = ntohl(req->request_seq); 3655 3656 /* now if its not a duplicate we process it */ 3657 if (asoc->str_reset_seq_in == seq) { 3658 len = ntohs(req->ph.param_length); 3659 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3660 /* 3661 * the sender is resetting, handle the list issue.. we must 3662 * a) verify if we can do the reset, if so no problem b) If 3663 * we can't do the reset we must copy the request. c) queue 3664 * it, and setup the data in processor to trigger it off 3665 * when needed and dequeue all the queued data. 3666 */ 3667 tsn = ntohl(req->send_reset_at_tsn); 3668 3669 /* move the reset action back one */ 3670 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3671 if (trunc) { 3672 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3673 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3674 } else if ((tsn == asoc->cumulative_tsn) || 3675 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3676 /* we can do it now */ 3677 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3678 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3679 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3680 } else { 3681 /* 3682 * we must queue it up and thus wait for the TSN's 3683 * to arrive that are at or before tsn 3684 */ 3685 struct sctp_stream_reset_list *liste; 3686 int siz; 3687 3688 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3689 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3690 siz, SCTP_M_STRESET); 3691 if (liste == NULL) { 3692 /* gak out of memory */ 3693 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3694 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3695 return; 3696 } 3697 liste->tsn = tsn; 3698 liste->number_entries = number_entries; 3699 memcpy(&liste->req, req, 3700 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3701 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3702 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3703 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3704 } 3705 asoc->str_reset_seq_in++; 3706 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3707 /* 3708 * one seq back, just echo back last action since my 3709 * response was lost. 3710 */ 3711 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3712 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3713 /* 3714 * two seq back, just echo back last action since my 3715 * response was lost. 3716 */ 3717 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3718 } else { 3719 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3720 } 3721 } 3722 3723 static void 3724 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3725 struct sctp_stream_reset_add_strm *str_add) 3726 { 3727 /* 3728 * Peer is requesting to add more streams. If its within our 3729 * max-streams we will allow it. 3730 */ 3731 uint16_t num_stream, i; 3732 uint32_t seq; 3733 3734 /* Get the number. */ 3735 seq = ntohl(str_add->request_seq); 3736 num_stream = ntohs(str_add->number_of_streams); 3737 /* Now what would be the new total? */ 3738 num_stream += stcb->asoc.streamincnt; 3739 if (num_stream > stcb->asoc.max_inbound_streams) { 3740 /* We must reject it they ask for to many */ 3741 denied: 3742 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3743 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3744 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3745 } else { 3746 /* Ok, we can do that :-) */ 3747 struct sctp_stream_in *oldstrm; 3748 3749 /* save off the old */ 3750 oldstrm = stcb->asoc.strmin; 3751 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3752 (num_stream * sizeof(struct sctp_stream_in)), 3753 SCTP_M_STRMI); 3754 if (stcb->asoc.strmin == NULL) { 3755 stcb->asoc.strmin = oldstrm; 3756 goto denied; 3757 } 3758 /* copy off the old data */ 3759 memcpy(stcb->asoc.strmin, oldstrm, 3760 (stcb->asoc.streamincnt * sizeof(struct sctp_stream_in))); 3761 /* Init the new streams */ 3762 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3763 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3764 stcb->asoc.strmin[i].stream_no = i; 3765 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3766 stcb->asoc.strmin[i].delivery_started = 0; 3767 } 3768 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3769 /* update the size */ 3770 stcb->asoc.streamincnt = num_stream; 3771 /* Send the ack */ 3772 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3773 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3774 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3775 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3776 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3777 } 3778 } 3779 3780 #ifdef __GNUC__ 3781 __attribute__((noinline)) 3782 #endif 3783 static int 3784 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3785 struct sctp_stream_reset_out_req *sr_req) 3786 { 3787 int chk_length, param_len, ptype; 3788 struct sctp_paramhdr pstore; 3789 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3790 3791 uint32_t seq; 3792 int num_req = 0; 3793 int trunc = 0; 3794 struct sctp_tmit_chunk *chk; 3795 struct sctp_chunkhdr *ch; 3796 struct sctp_paramhdr *ph; 3797 int ret_code = 0; 3798 int num_param = 0; 3799 3800 /* now it may be a reset or a reset-response */ 3801 chk_length = ntohs(sr_req->ch.chunk_length); 3802 3803 /* setup for adding the response */ 3804 sctp_alloc_a_chunk(stcb, chk); 3805 if (chk == NULL) { 3806 return (ret_code); 3807 } 3808 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3809 chk->rec.chunk_id.can_take_data = 0; 3810 chk->asoc = &stcb->asoc; 3811 chk->no_fr_allowed = 0; 3812 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3813 chk->book_size_scale = 0; 3814 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3815 if (chk->data == NULL) { 3816 strres_nochunk: 3817 if (chk->data) { 3818 sctp_m_freem(chk->data); 3819 chk->data = NULL; 3820 } 3821 sctp_free_a_chunk(stcb, chk); 3822 return (ret_code); 3823 } 3824 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3825 3826 /* setup chunk parameters */ 3827 chk->sent = SCTP_DATAGRAM_UNSENT; 3828 chk->snd_count = 0; 3829 chk->whoTo = stcb->asoc.primary_destination; 3830 atomic_add_int(&chk->whoTo->ref_count, 1); 3831 3832 ch = mtod(chk->data, struct sctp_chunkhdr *); 3833 ch->chunk_type = SCTP_STREAM_RESET; 3834 ch->chunk_flags = 0; 3835 ch->chunk_length = htons(chk->send_size); 3836 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3837 offset += sizeof(struct sctp_chunkhdr); 3838 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3839 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3840 if (ph == NULL) 3841 break; 3842 param_len = ntohs(ph->param_length); 3843 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3844 /* bad param */ 3845 break; 3846 } 3847 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3848 (uint8_t *) & cstore); 3849 ptype = ntohs(ph->param_type); 3850 num_param++; 3851 if (param_len > (int)sizeof(cstore)) { 3852 trunc = 1; 3853 } else { 3854 trunc = 0; 3855 } 3856 3857 if (num_param > SCTP_MAX_RESET_PARAMS) { 3858 /* hit the max of parameters already sorry.. */ 3859 break; 3860 } 3861 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3862 struct sctp_stream_reset_out_request *req_out; 3863 3864 req_out = (struct sctp_stream_reset_out_request *)ph; 3865 num_req++; 3866 if (stcb->asoc.stream_reset_outstanding) { 3867 seq = ntohl(req_out->response_seq); 3868 if (seq == stcb->asoc.str_reset_seq_out) { 3869 /* implicit ack */ 3870 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3871 } 3872 } 3873 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3874 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3875 struct sctp_stream_reset_add_strm *str_add; 3876 3877 str_add = (struct sctp_stream_reset_add_strm *)ph; 3878 num_req++; 3879 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3880 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3881 struct sctp_stream_reset_in_request *req_in; 3882 3883 num_req++; 3884 3885 req_in = (struct sctp_stream_reset_in_request *)ph; 3886 3887 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3888 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3889 struct sctp_stream_reset_tsn_request *req_tsn; 3890 3891 num_req++; 3892 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3893 3894 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3895 ret_code = 1; 3896 goto strres_nochunk; 3897 } 3898 /* no more */ 3899 break; 3900 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3901 struct sctp_stream_reset_response *resp; 3902 uint32_t result; 3903 3904 resp = (struct sctp_stream_reset_response *)ph; 3905 seq = ntohl(resp->response_seq); 3906 result = ntohl(resp->result); 3907 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3908 ret_code = 1; 3909 goto strres_nochunk; 3910 } 3911 } else { 3912 break; 3913 } 3914 offset += SCTP_SIZE32(param_len); 3915 chk_length -= SCTP_SIZE32(param_len); 3916 } 3917 if (num_req == 0) { 3918 /* we have no response free the stuff */ 3919 goto strres_nochunk; 3920 } 3921 /* ok we have a chunk to link in */ 3922 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3923 chk, 3924 sctp_next); 3925 stcb->asoc.ctrl_queue_cnt++; 3926 return (ret_code); 3927 } 3928 3929 /* 3930 * Handle a router or endpoints report of a packet loss, there are two ways 3931 * to handle this, either we get the whole packet and must disect it 3932 * ourselves (possibly with truncation and or corruption) or it is a summary 3933 * from a middle box that did the disectting for us. 3934 */ 3935 static void 3936 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3937 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3938 { 3939 uint32_t bottle_bw, on_queue; 3940 uint16_t trunc_len; 3941 unsigned int chlen; 3942 unsigned int at; 3943 struct sctp_chunk_desc desc; 3944 struct sctp_chunkhdr *ch; 3945 3946 chlen = ntohs(cp->ch.chunk_length); 3947 chlen -= sizeof(struct sctp_pktdrop_chunk); 3948 /* XXX possible chlen underflow */ 3949 if (chlen == 0) { 3950 ch = NULL; 3951 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3952 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3953 } else { 3954 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3955 chlen -= sizeof(struct sctphdr); 3956 /* XXX possible chlen underflow */ 3957 memset(&desc, 0, sizeof(desc)); 3958 } 3959 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3960 if (trunc_len > limit) { 3961 trunc_len = limit; 3962 } 3963 /* now the chunks themselves */ 3964 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3965 desc.chunk_type = ch->chunk_type; 3966 /* get amount we need to move */ 3967 at = ntohs(ch->chunk_length); 3968 if (at < sizeof(struct sctp_chunkhdr)) { 3969 /* corrupt chunk, maybe at the end? */ 3970 SCTP_STAT_INCR(sctps_pdrpcrupt); 3971 break; 3972 } 3973 if (trunc_len == 0) { 3974 /* we are supposed to have all of it */ 3975 if (at > chlen) { 3976 /* corrupt skip it */ 3977 SCTP_STAT_INCR(sctps_pdrpcrupt); 3978 break; 3979 } 3980 } else { 3981 /* is there enough of it left ? */ 3982 if (desc.chunk_type == SCTP_DATA) { 3983 if (chlen < (sizeof(struct sctp_data_chunk) + 3984 sizeof(desc.data_bytes))) { 3985 break; 3986 } 3987 } else { 3988 if (chlen < sizeof(struct sctp_chunkhdr)) { 3989 break; 3990 } 3991 } 3992 } 3993 if (desc.chunk_type == SCTP_DATA) { 3994 /* can we get out the tsn? */ 3995 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3996 SCTP_STAT_INCR(sctps_pdrpmbda); 3997 3998 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3999 /* yep */ 4000 struct sctp_data_chunk *dcp; 4001 uint8_t *ddp; 4002 unsigned int iii; 4003 4004 dcp = (struct sctp_data_chunk *)ch; 4005 ddp = (uint8_t *) (dcp + 1); 4006 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4007 desc.data_bytes[iii] = ddp[iii]; 4008 } 4009 desc.tsn_ifany = dcp->dp.tsn; 4010 } else { 4011 /* nope we are done. */ 4012 SCTP_STAT_INCR(sctps_pdrpnedat); 4013 break; 4014 } 4015 } else { 4016 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4017 SCTP_STAT_INCR(sctps_pdrpmbct); 4018 } 4019 4020 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4021 SCTP_STAT_INCR(sctps_pdrppdbrk); 4022 break; 4023 } 4024 if (SCTP_SIZE32(at) > chlen) { 4025 break; 4026 } 4027 chlen -= SCTP_SIZE32(at); 4028 if (chlen < sizeof(struct sctp_chunkhdr)) { 4029 /* done, none left */ 4030 break; 4031 } 4032 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4033 } 4034 /* Now update any rwnd --- possibly */ 4035 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4036 /* From a peer, we get a rwnd report */ 4037 uint32_t a_rwnd; 4038 4039 SCTP_STAT_INCR(sctps_pdrpfehos); 4040 4041 bottle_bw = ntohl(cp->bottle_bw); 4042 on_queue = ntohl(cp->current_onq); 4043 if (bottle_bw && on_queue) { 4044 /* a rwnd report is in here */ 4045 if (bottle_bw > on_queue) 4046 a_rwnd = bottle_bw - on_queue; 4047 else 4048 a_rwnd = 0; 4049 4050 if (a_rwnd == 0) 4051 stcb->asoc.peers_rwnd = 0; 4052 else { 4053 if (a_rwnd > stcb->asoc.total_flight) { 4054 stcb->asoc.peers_rwnd = 4055 a_rwnd - stcb->asoc.total_flight; 4056 } else { 4057 stcb->asoc.peers_rwnd = 0; 4058 } 4059 if (stcb->asoc.peers_rwnd < 4060 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4061 /* SWS sender side engages */ 4062 stcb->asoc.peers_rwnd = 0; 4063 } 4064 } 4065 } 4066 } else { 4067 SCTP_STAT_INCR(sctps_pdrpfmbox); 4068 } 4069 4070 /* now middle boxes in sat networks get a cwnd bump */ 4071 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4072 (stcb->asoc.sat_t3_loss_recovery == 0) && 4073 (stcb->asoc.sat_network)) { 4074 /* 4075 * This is debateable but for sat networks it makes sense 4076 * Note if a T3 timer has went off, we will prohibit any 4077 * changes to cwnd until we exit the t3 loss recovery. 4078 */ 4079 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4080 net, cp, &bottle_bw, &on_queue); 4081 } 4082 } 4083 4084 /* 4085 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4086 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4087 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4088 * length of the complete packet outputs: - length: modified to remaining 4089 * length after control processing - netp: modified to new sctp_nets after 4090 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4091 * bad packet,...) otherwise return the tcb for this packet 4092 */ 4093 #ifdef __GNUC__ 4094 __attribute__((noinline)) 4095 #endif 4096 static struct sctp_tcb * 4097 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4098 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4099 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4100 uint32_t vrf_id, uint16_t port) 4101 { 4102 struct sctp_association *asoc; 4103 uint32_t vtag_in; 4104 int num_chunks = 0; /* number of control chunks processed */ 4105 uint32_t chk_length; 4106 int ret; 4107 int abort_no_unlock = 0; 4108 4109 /* 4110 * How big should this be, and should it be alloc'd? Lets try the 4111 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4112 * until we get into jumbo grams and such.. 4113 */ 4114 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4115 struct sctp_tcb *locked_tcb = stcb; 4116 int got_auth = 0; 4117 uint32_t auth_offset = 0, auth_len = 0; 4118 int auth_skipped = 0; 4119 int asconf_cnt = 0; 4120 4121 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4122 struct socket *so; 4123 4124 #endif 4125 4126 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4127 iphlen, *offset, length, stcb); 4128 4129 /* validate chunk header length... */ 4130 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4131 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4132 ntohs(ch->chunk_length)); 4133 if (locked_tcb) { 4134 SCTP_TCB_UNLOCK(locked_tcb); 4135 } 4136 return (NULL); 4137 } 4138 /* 4139 * validate the verification tag 4140 */ 4141 vtag_in = ntohl(sh->v_tag); 4142 4143 if (locked_tcb) { 4144 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4145 } 4146 if (ch->chunk_type == SCTP_INITIATION) { 4147 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4148 ntohs(ch->chunk_length), vtag_in); 4149 if (vtag_in != 0) { 4150 /* protocol error- silently discard... */ 4151 SCTP_STAT_INCR(sctps_badvtag); 4152 if (locked_tcb) { 4153 SCTP_TCB_UNLOCK(locked_tcb); 4154 } 4155 return (NULL); 4156 } 4157 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4158 /* 4159 * If there is no stcb, skip the AUTH chunk and process 4160 * later after a stcb is found (to validate the lookup was 4161 * valid. 4162 */ 4163 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4164 (stcb == NULL) && 4165 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4166 /* save this chunk for later processing */ 4167 auth_skipped = 1; 4168 auth_offset = *offset; 4169 auth_len = ntohs(ch->chunk_length); 4170 4171 /* (temporarily) move past this chunk */ 4172 *offset += SCTP_SIZE32(auth_len); 4173 if (*offset >= length) { 4174 /* no more data left in the mbuf chain */ 4175 *offset = length; 4176 if (locked_tcb) { 4177 SCTP_TCB_UNLOCK(locked_tcb); 4178 } 4179 return (NULL); 4180 } 4181 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4182 sizeof(struct sctp_chunkhdr), chunk_buf); 4183 } 4184 if (ch == NULL) { 4185 /* Help */ 4186 *offset = length; 4187 if (locked_tcb) { 4188 SCTP_TCB_UNLOCK(locked_tcb); 4189 } 4190 return (NULL); 4191 } 4192 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4193 goto process_control_chunks; 4194 } 4195 /* 4196 * first check if it's an ASCONF with an unknown src addr we 4197 * need to look inside to find the association 4198 */ 4199 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4200 struct sctp_chunkhdr *asconf_ch = ch; 4201 uint32_t asconf_offset = 0, asconf_len = 0; 4202 4203 /* inp's refcount may be reduced */ 4204 SCTP_INP_INCR_REF(inp); 4205 4206 asconf_offset = *offset; 4207 do { 4208 asconf_len = ntohs(asconf_ch->chunk_length); 4209 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4210 break; 4211 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4212 *offset, sh, &inp, netp, vrf_id); 4213 if (stcb != NULL) 4214 break; 4215 asconf_offset += SCTP_SIZE32(asconf_len); 4216 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4217 sizeof(struct sctp_chunkhdr), chunk_buf); 4218 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4219 if (stcb == NULL) { 4220 /* 4221 * reduce inp's refcount if not reduced in 4222 * sctp_findassociation_ep_asconf(). 4223 */ 4224 SCTP_INP_DECR_REF(inp); 4225 } else { 4226 locked_tcb = stcb; 4227 } 4228 4229 /* now go back and verify any auth chunk to be sure */ 4230 if (auth_skipped && (stcb != NULL)) { 4231 struct sctp_auth_chunk *auth; 4232 4233 auth = (struct sctp_auth_chunk *) 4234 sctp_m_getptr(m, auth_offset, 4235 auth_len, chunk_buf); 4236 got_auth = 1; 4237 auth_skipped = 0; 4238 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4239 auth_offset)) { 4240 /* auth HMAC failed so dump it */ 4241 *offset = length; 4242 if (locked_tcb) { 4243 SCTP_TCB_UNLOCK(locked_tcb); 4244 } 4245 return (NULL); 4246 } else { 4247 /* remaining chunks are HMAC checked */ 4248 stcb->asoc.authenticated = 1; 4249 } 4250 } 4251 } 4252 if (stcb == NULL) { 4253 /* no association, so it's out of the blue... */ 4254 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4255 vrf_id, port); 4256 *offset = length; 4257 if (locked_tcb) { 4258 SCTP_TCB_UNLOCK(locked_tcb); 4259 } 4260 return (NULL); 4261 } 4262 asoc = &stcb->asoc; 4263 /* ABORT and SHUTDOWN can use either v_tag... */ 4264 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4265 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4266 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4267 if ((vtag_in == asoc->my_vtag) || 4268 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4269 (vtag_in == asoc->peer_vtag))) { 4270 /* this is valid */ 4271 } else { 4272 /* drop this packet... */ 4273 SCTP_STAT_INCR(sctps_badvtag); 4274 if (locked_tcb) { 4275 SCTP_TCB_UNLOCK(locked_tcb); 4276 } 4277 return (NULL); 4278 } 4279 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4280 if (vtag_in != asoc->my_vtag) { 4281 /* 4282 * this could be a stale SHUTDOWN-ACK or the 4283 * peer never got the SHUTDOWN-COMPLETE and 4284 * is still hung; we have started a new asoc 4285 * but it won't complete until the shutdown 4286 * is completed 4287 */ 4288 if (locked_tcb) { 4289 SCTP_TCB_UNLOCK(locked_tcb); 4290 } 4291 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4292 NULL, vrf_id, port); 4293 return (NULL); 4294 } 4295 } else { 4296 /* for all other chunks, vtag must match */ 4297 if (vtag_in != asoc->my_vtag) { 4298 /* invalid vtag... */ 4299 SCTPDBG(SCTP_DEBUG_INPUT3, 4300 "invalid vtag: %xh, expect %xh\n", 4301 vtag_in, asoc->my_vtag); 4302 SCTP_STAT_INCR(sctps_badvtag); 4303 if (locked_tcb) { 4304 SCTP_TCB_UNLOCK(locked_tcb); 4305 } 4306 *offset = length; 4307 return (NULL); 4308 } 4309 } 4310 } /* end if !SCTP_COOKIE_ECHO */ 4311 /* 4312 * process all control chunks... 4313 */ 4314 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4315 /* EY */ 4316 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4317 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4318 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4319 /* implied cookie-ack.. we must have lost the ack */ 4320 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4321 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4322 stcb->asoc.overall_error_count, 4323 0, 4324 SCTP_FROM_SCTP_INPUT, 4325 __LINE__); 4326 } 4327 stcb->asoc.overall_error_count = 0; 4328 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4329 *netp); 4330 } 4331 process_control_chunks: 4332 while (IS_SCTP_CONTROL(ch)) { 4333 /* validate chunk length */ 4334 chk_length = ntohs(ch->chunk_length); 4335 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4336 ch->chunk_type, chk_length); 4337 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4338 if (chk_length < sizeof(*ch) || 4339 (*offset + (int)chk_length) > length) { 4340 *offset = length; 4341 if (locked_tcb) { 4342 SCTP_TCB_UNLOCK(locked_tcb); 4343 } 4344 return (NULL); 4345 } 4346 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4347 /* 4348 * INIT-ACK only gets the init ack "header" portion only 4349 * because we don't have to process the peer's COOKIE. All 4350 * others get a complete chunk. 4351 */ 4352 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4353 (ch->chunk_type == SCTP_INITIATION)) { 4354 /* get an init-ack chunk */ 4355 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4356 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4357 if (ch == NULL) { 4358 *offset = length; 4359 if (locked_tcb) { 4360 SCTP_TCB_UNLOCK(locked_tcb); 4361 } 4362 return (NULL); 4363 } 4364 } else { 4365 /* For cookies and all other chunks. */ 4366 if (chk_length > sizeof(chunk_buf)) { 4367 /* 4368 * use just the size of the chunk buffer so 4369 * the front part of our chunks fit in 4370 * contiguous space up to the chunk buffer 4371 * size (508 bytes). For chunks that need to 4372 * get more than that they must use the 4373 * sctp_m_getptr() function or other means 4374 * (e.g. know how to parse mbuf chains). 4375 * Cookies do this already. 4376 */ 4377 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4378 (sizeof(chunk_buf) - 4), 4379 chunk_buf); 4380 if (ch == NULL) { 4381 *offset = length; 4382 if (locked_tcb) { 4383 SCTP_TCB_UNLOCK(locked_tcb); 4384 } 4385 return (NULL); 4386 } 4387 } else { 4388 /* We can fit it all */ 4389 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4390 chk_length, chunk_buf); 4391 if (ch == NULL) { 4392 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4393 *offset = length; 4394 if (locked_tcb) { 4395 SCTP_TCB_UNLOCK(locked_tcb); 4396 } 4397 return (NULL); 4398 } 4399 } 4400 } 4401 num_chunks++; 4402 /* Save off the last place we got a control from */ 4403 if (stcb != NULL) { 4404 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4405 /* 4406 * allow last_control to be NULL if 4407 * ASCONF... ASCONF processing will find the 4408 * right net later 4409 */ 4410 if ((netp != NULL) && (*netp != NULL)) 4411 stcb->asoc.last_control_chunk_from = *netp; 4412 } 4413 } 4414 #ifdef SCTP_AUDITING_ENABLED 4415 sctp_audit_log(0xB0, ch->chunk_type); 4416 #endif 4417 4418 /* check to see if this chunk required auth, but isn't */ 4419 if ((stcb != NULL) && 4420 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4421 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4422 !stcb->asoc.authenticated) { 4423 /* "silently" ignore */ 4424 SCTP_STAT_INCR(sctps_recvauthmissing); 4425 goto next_chunk; 4426 } 4427 switch (ch->chunk_type) { 4428 case SCTP_INITIATION: 4429 /* must be first and only chunk */ 4430 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4431 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4432 /* We are not interested anymore? */ 4433 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4434 /* 4435 * collision case where we are 4436 * sending to them too 4437 */ 4438 ; 4439 } else { 4440 if (locked_tcb) { 4441 SCTP_TCB_UNLOCK(locked_tcb); 4442 } 4443 *offset = length; 4444 return (NULL); 4445 } 4446 } 4447 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4448 (num_chunks > 1) || 4449 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4450 *offset = length; 4451 if (locked_tcb) { 4452 SCTP_TCB_UNLOCK(locked_tcb); 4453 } 4454 return (NULL); 4455 } 4456 if ((stcb != NULL) && 4457 (SCTP_GET_STATE(&stcb->asoc) == 4458 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4459 sctp_send_shutdown_ack(stcb, 4460 stcb->asoc.primary_destination); 4461 *offset = length; 4462 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4463 if (locked_tcb) { 4464 SCTP_TCB_UNLOCK(locked_tcb); 4465 } 4466 return (NULL); 4467 } 4468 if (netp) { 4469 sctp_handle_init(m, iphlen, *offset, sh, 4470 (struct sctp_init_chunk *)ch, inp, 4471 stcb, *netp, &abort_no_unlock, vrf_id, port); 4472 } 4473 if (abort_no_unlock) 4474 return (NULL); 4475 4476 *offset = length; 4477 if (locked_tcb) { 4478 SCTP_TCB_UNLOCK(locked_tcb); 4479 } 4480 return (NULL); 4481 break; 4482 case SCTP_PAD_CHUNK: 4483 break; 4484 case SCTP_INITIATION_ACK: 4485 /* must be first and only chunk */ 4486 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4487 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4488 /* We are not interested anymore */ 4489 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4490 ; 4491 } else { 4492 if (locked_tcb) { 4493 SCTP_TCB_UNLOCK(locked_tcb); 4494 } 4495 *offset = length; 4496 if (stcb) { 4497 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4498 so = SCTP_INP_SO(inp); 4499 atomic_add_int(&stcb->asoc.refcnt, 1); 4500 SCTP_TCB_UNLOCK(stcb); 4501 SCTP_SOCKET_LOCK(so, 1); 4502 SCTP_TCB_LOCK(stcb); 4503 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4504 #endif 4505 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4506 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4507 SCTP_SOCKET_UNLOCK(so, 1); 4508 #endif 4509 } 4510 return (NULL); 4511 } 4512 } 4513 if ((num_chunks > 1) || 4514 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4515 *offset = length; 4516 if (locked_tcb) { 4517 SCTP_TCB_UNLOCK(locked_tcb); 4518 } 4519 return (NULL); 4520 } 4521 if ((netp) && (*netp)) { 4522 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4523 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4524 } else { 4525 ret = -1; 4526 } 4527 /* 4528 * Special case, I must call the output routine to 4529 * get the cookie echoed 4530 */ 4531 if (abort_no_unlock) 4532 return (NULL); 4533 4534 if ((stcb) && ret == 0) 4535 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4536 *offset = length; 4537 if (locked_tcb) { 4538 SCTP_TCB_UNLOCK(locked_tcb); 4539 } 4540 return (NULL); 4541 break; 4542 case SCTP_SELECTIVE_ACK: 4543 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4544 SCTP_STAT_INCR(sctps_recvsacks); 4545 { 4546 struct sctp_sack_chunk *sack; 4547 int abort_now = 0; 4548 uint32_t a_rwnd, cum_ack; 4549 uint16_t num_seg; 4550 int nonce_sum_flag; 4551 4552 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) { 4553 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n"); 4554 *offset = length; 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 return (NULL); 4559 } 4560 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4561 /*- 4562 * If we have sent a shutdown-ack, we will pay no 4563 * attention to a sack sent in to us since 4564 * we don't care anymore. 4565 */ 4566 break; 4567 } 4568 sack = (struct sctp_sack_chunk *)ch; 4569 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4570 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4571 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4572 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4573 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4574 cum_ack, 4575 num_seg, 4576 a_rwnd 4577 ); 4578 stcb->asoc.seen_a_sack_this_pkt = 1; 4579 if ((stcb->asoc.pr_sctp_cnt == 0) && 4580 (num_seg == 0) && 4581 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4582 (cum_ack == stcb->asoc.last_acked_seq)) && 4583 (stcb->asoc.saw_sack_with_frags == 0) && 4584 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4585 ) { 4586 /* 4587 * We have a SIMPLE sack having no 4588 * prior segments and data on sent 4589 * queue to be acked.. Use the 4590 * faster path sack processing. We 4591 * also allow window update sacks 4592 * with no missing segments to go 4593 * this way too. 4594 */ 4595 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4596 &abort_now); 4597 } else { 4598 if (netp && *netp) 4599 sctp_handle_sack(m, *offset, 4600 sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4601 } 4602 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4603 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4604 (stcb->asoc.stream_queue_cnt == 0)) { 4605 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4606 } 4607 if (abort_now) { 4608 /* ABORT signal from sack processing */ 4609 *offset = length; 4610 return (NULL); 4611 } 4612 } 4613 break; 4614 /* 4615 * EY - nr_sack: If the received chunk is an 4616 * nr_sack chunk 4617 */ 4618 case SCTP_NR_SELECTIVE_ACK: 4619 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4620 SCTP_STAT_INCR(sctps_recvsacks); 4621 { 4622 struct sctp_nr_sack_chunk *nr_sack; 4623 int abort_now = 0; 4624 uint32_t a_rwnd, cum_ack; 4625 uint16_t num_seg, num_nr_seg; 4626 int nonce_sum_flag, all_bit; 4627 4628 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_nr_sack_chunk))) { 4629 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on nr_sack chunk, too small\n"); 4630 ignore_nr_sack: 4631 *offset = length; 4632 if (locked_tcb) { 4633 SCTP_TCB_UNLOCK(locked_tcb); 4634 } 4635 return (NULL); 4636 } 4637 /* 4638 * EY nr_sacks have not been negotiated but 4639 * the peer end sent an nr_sack, silently 4640 * discard the chunk 4641 */ 4642 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack)) { 4643 goto unknown_chunk; 4644 } 4645 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4646 /*- 4647 * If we have sent a shutdown-ack, we will pay no 4648 * attention to a sack sent in to us since 4649 * we don't care anymore. 4650 */ 4651 goto ignore_nr_sack; 4652 } 4653 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4654 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4655 all_bit = ch->chunk_flags & SCTP_NR_SACK_ALL_BIT; 4656 4657 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4658 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4659 /* 4660 * EY -if All bit is set, then there are as 4661 * many gaps as nr_gaps 4662 */ 4663 if (all_bit) { 4664 num_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4665 } 4666 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4667 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4668 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4669 cum_ack, 4670 num_seg, 4671 a_rwnd 4672 ); 4673 stcb->asoc.seen_a_sack_this_pkt = 1; 4674 if ((stcb->asoc.pr_sctp_cnt == 0) && 4675 (num_seg == 0) && 4676 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4677 (cum_ack == stcb->asoc.last_acked_seq)) && 4678 (stcb->asoc.saw_sack_with_frags == 0) && 4679 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4680 ) { 4681 /* 4682 * We have a SIMPLE sack having no 4683 * prior segments and data on sent 4684 * queue to be acked.. Use the 4685 * faster path sack processing. We 4686 * also allow window update sacks 4687 * with no missing segments to go 4688 * this way too. 4689 */ 4690 sctp_express_handle_nr_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4691 &abort_now); 4692 } else { 4693 if (netp && *netp) 4694 sctp_handle_nr_sack(m, *offset, 4695 nr_sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4696 } 4697 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4698 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4699 (stcb->asoc.stream_queue_cnt == 0)) { 4700 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4701 } 4702 if (abort_now) { 4703 /* ABORT signal from sack processing */ 4704 *offset = length; 4705 return (NULL); 4706 } 4707 } 4708 break; 4709 4710 case SCTP_HEARTBEAT_REQUEST: 4711 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4712 if ((stcb) && netp && *netp) { 4713 SCTP_STAT_INCR(sctps_recvheartbeat); 4714 sctp_send_heartbeat_ack(stcb, m, *offset, 4715 chk_length, *netp); 4716 4717 /* He's alive so give him credit */ 4718 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4719 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4720 stcb->asoc.overall_error_count, 4721 0, 4722 SCTP_FROM_SCTP_INPUT, 4723 __LINE__); 4724 } 4725 stcb->asoc.overall_error_count = 0; 4726 } 4727 break; 4728 case SCTP_HEARTBEAT_ACK: 4729 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4730 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4731 /* Its not ours */ 4732 *offset = length; 4733 if (locked_tcb) { 4734 SCTP_TCB_UNLOCK(locked_tcb); 4735 } 4736 return (NULL); 4737 } 4738 /* He's alive so give him credit */ 4739 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4740 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4741 stcb->asoc.overall_error_count, 4742 0, 4743 SCTP_FROM_SCTP_INPUT, 4744 __LINE__); 4745 } 4746 stcb->asoc.overall_error_count = 0; 4747 SCTP_STAT_INCR(sctps_recvheartbeatack); 4748 if (netp && *netp) 4749 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4750 stcb, *netp); 4751 break; 4752 case SCTP_ABORT_ASSOCIATION: 4753 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4754 stcb); 4755 if ((stcb) && netp && *netp) 4756 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4757 stcb, *netp); 4758 *offset = length; 4759 return (NULL); 4760 break; 4761 case SCTP_SHUTDOWN: 4762 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4763 stcb); 4764 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4765 *offset = length; 4766 if (locked_tcb) { 4767 SCTP_TCB_UNLOCK(locked_tcb); 4768 } 4769 return (NULL); 4770 } 4771 if (netp && *netp) { 4772 int abort_flag = 0; 4773 4774 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4775 stcb, *netp, &abort_flag); 4776 if (abort_flag) { 4777 *offset = length; 4778 return (NULL); 4779 } 4780 } 4781 break; 4782 case SCTP_SHUTDOWN_ACK: 4783 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4784 if ((stcb) && (netp) && (*netp)) 4785 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4786 *offset = length; 4787 return (NULL); 4788 break; 4789 4790 case SCTP_OPERATION_ERROR: 4791 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4792 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4793 4794 *offset = length; 4795 return (NULL); 4796 } 4797 break; 4798 case SCTP_COOKIE_ECHO: 4799 SCTPDBG(SCTP_DEBUG_INPUT3, 4800 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4801 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4802 ; 4803 } else { 4804 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4805 /* We are not interested anymore */ 4806 *offset = length; 4807 return (NULL); 4808 } 4809 } 4810 /* 4811 * First are we accepting? We do this again here 4812 * sincen it is possible that a previous endpoint 4813 * WAS listening responded to a INIT-ACK and then 4814 * closed. We opened and bound.. and are now no 4815 * longer listening. 4816 */ 4817 4818 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4819 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4820 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4821 struct mbuf *oper; 4822 struct sctp_paramhdr *phdr; 4823 4824 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4825 0, M_DONTWAIT, 1, MT_DATA); 4826 if (oper) { 4827 SCTP_BUF_LEN(oper) = 4828 sizeof(struct sctp_paramhdr); 4829 phdr = mtod(oper, 4830 struct sctp_paramhdr *); 4831 phdr->param_type = 4832 htons(SCTP_CAUSE_OUT_OF_RESC); 4833 phdr->param_length = 4834 htons(sizeof(struct sctp_paramhdr)); 4835 } 4836 sctp_abort_association(inp, stcb, m, 4837 iphlen, sh, oper, vrf_id, port); 4838 } 4839 *offset = length; 4840 return (NULL); 4841 } else { 4842 struct mbuf *ret_buf; 4843 struct sctp_inpcb *linp; 4844 4845 if (stcb) { 4846 linp = NULL; 4847 } else { 4848 linp = inp; 4849 } 4850 4851 if (linp) { 4852 SCTP_ASOC_CREATE_LOCK(linp); 4853 } 4854 if (netp) { 4855 ret_buf = 4856 sctp_handle_cookie_echo(m, iphlen, 4857 *offset, sh, 4858 (struct sctp_cookie_echo_chunk *)ch, 4859 &inp, &stcb, netp, 4860 auth_skipped, 4861 auth_offset, 4862 auth_len, 4863 &locked_tcb, 4864 vrf_id, 4865 port); 4866 } else { 4867 ret_buf = NULL; 4868 } 4869 if (linp) { 4870 SCTP_ASOC_CREATE_UNLOCK(linp); 4871 } 4872 if (ret_buf == NULL) { 4873 if (locked_tcb) { 4874 SCTP_TCB_UNLOCK(locked_tcb); 4875 } 4876 SCTPDBG(SCTP_DEBUG_INPUT3, 4877 "GAK, null buffer\n"); 4878 auth_skipped = 0; 4879 *offset = length; 4880 return (NULL); 4881 } 4882 /* if AUTH skipped, see if it verified... */ 4883 if (auth_skipped) { 4884 got_auth = 1; 4885 auth_skipped = 0; 4886 } 4887 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4888 /* 4889 * Restart the timer if we have 4890 * pending data 4891 */ 4892 struct sctp_tmit_chunk *chk; 4893 4894 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4895 if (chk) { 4896 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4897 stcb->sctp_ep, stcb, 4898 chk->whoTo); 4899 } 4900 } 4901 } 4902 break; 4903 case SCTP_COOKIE_ACK: 4904 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4905 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4906 if (locked_tcb) { 4907 SCTP_TCB_UNLOCK(locked_tcb); 4908 } 4909 return (NULL); 4910 } 4911 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4912 /* We are not interested anymore */ 4913 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4914 ; 4915 } else if (stcb) { 4916 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4917 so = SCTP_INP_SO(inp); 4918 atomic_add_int(&stcb->asoc.refcnt, 1); 4919 SCTP_TCB_UNLOCK(stcb); 4920 SCTP_SOCKET_LOCK(so, 1); 4921 SCTP_TCB_LOCK(stcb); 4922 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4923 #endif 4924 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4925 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4926 SCTP_SOCKET_UNLOCK(so, 1); 4927 #endif 4928 *offset = length; 4929 return (NULL); 4930 } 4931 } 4932 /* He's alive so give him credit */ 4933 if ((stcb) && netp && *netp) { 4934 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4935 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4936 stcb->asoc.overall_error_count, 4937 0, 4938 SCTP_FROM_SCTP_INPUT, 4939 __LINE__); 4940 } 4941 stcb->asoc.overall_error_count = 0; 4942 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4943 } 4944 break; 4945 case SCTP_ECN_ECHO: 4946 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4947 /* He's alive so give him credit */ 4948 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4949 /* Its not ours */ 4950 if (locked_tcb) { 4951 SCTP_TCB_UNLOCK(locked_tcb); 4952 } 4953 *offset = length; 4954 return (NULL); 4955 } 4956 if (stcb) { 4957 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4958 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4959 stcb->asoc.overall_error_count, 4960 0, 4961 SCTP_FROM_SCTP_INPUT, 4962 __LINE__); 4963 } 4964 stcb->asoc.overall_error_count = 0; 4965 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4966 stcb); 4967 } 4968 break; 4969 case SCTP_ECN_CWR: 4970 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 4971 /* He's alive so give him credit */ 4972 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 4973 /* Its not ours */ 4974 if (locked_tcb) { 4975 SCTP_TCB_UNLOCK(locked_tcb); 4976 } 4977 *offset = length; 4978 return (NULL); 4979 } 4980 if (stcb) { 4981 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4982 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4983 stcb->asoc.overall_error_count, 4984 0, 4985 SCTP_FROM_SCTP_INPUT, 4986 __LINE__); 4987 } 4988 stcb->asoc.overall_error_count = 0; 4989 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4990 } 4991 break; 4992 case SCTP_SHUTDOWN_COMPLETE: 4993 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 4994 /* must be first and only chunk */ 4995 if ((num_chunks > 1) || 4996 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4997 *offset = length; 4998 if (locked_tcb) { 4999 SCTP_TCB_UNLOCK(locked_tcb); 5000 } 5001 return (NULL); 5002 } 5003 if ((stcb) && netp && *netp) { 5004 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5005 stcb, *netp); 5006 } 5007 *offset = length; 5008 return (NULL); 5009 break; 5010 case SCTP_ASCONF: 5011 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5012 /* He's alive so give him credit */ 5013 if (stcb) { 5014 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5015 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5016 stcb->asoc.overall_error_count, 5017 0, 5018 SCTP_FROM_SCTP_INPUT, 5019 __LINE__); 5020 } 5021 stcb->asoc.overall_error_count = 0; 5022 sctp_handle_asconf(m, *offset, 5023 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5024 asconf_cnt++; 5025 } 5026 break; 5027 case SCTP_ASCONF_ACK: 5028 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5029 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5030 /* Its not ours */ 5031 if (locked_tcb) { 5032 SCTP_TCB_UNLOCK(locked_tcb); 5033 } 5034 *offset = length; 5035 return (NULL); 5036 } 5037 if ((stcb) && netp && *netp) { 5038 /* He's alive so give him credit */ 5039 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5040 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5041 stcb->asoc.overall_error_count, 5042 0, 5043 SCTP_FROM_SCTP_INPUT, 5044 __LINE__); 5045 } 5046 stcb->asoc.overall_error_count = 0; 5047 sctp_handle_asconf_ack(m, *offset, 5048 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5049 if (abort_no_unlock) 5050 return (NULL); 5051 } 5052 break; 5053 case SCTP_FORWARD_CUM_TSN: 5054 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5055 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5056 /* Its not ours */ 5057 if (locked_tcb) { 5058 SCTP_TCB_UNLOCK(locked_tcb); 5059 } 5060 *offset = length; 5061 return (NULL); 5062 } 5063 /* He's alive so give him credit */ 5064 if (stcb) { 5065 int abort_flag = 0; 5066 5067 stcb->asoc.overall_error_count = 0; 5068 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5069 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5070 stcb->asoc.overall_error_count, 5071 0, 5072 SCTP_FROM_SCTP_INPUT, 5073 __LINE__); 5074 } 5075 *fwd_tsn_seen = 1; 5076 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5077 /* We are not interested anymore */ 5078 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5079 so = SCTP_INP_SO(inp); 5080 atomic_add_int(&stcb->asoc.refcnt, 1); 5081 SCTP_TCB_UNLOCK(stcb); 5082 SCTP_SOCKET_LOCK(so, 1); 5083 SCTP_TCB_LOCK(stcb); 5084 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5085 #endif 5086 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5087 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5088 SCTP_SOCKET_UNLOCK(so, 1); 5089 #endif 5090 *offset = length; 5091 return (NULL); 5092 } 5093 sctp_handle_forward_tsn(stcb, 5094 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5095 if (abort_flag) { 5096 *offset = length; 5097 return (NULL); 5098 } else { 5099 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5100 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5101 stcb->asoc.overall_error_count, 5102 0, 5103 SCTP_FROM_SCTP_INPUT, 5104 __LINE__); 5105 } 5106 stcb->asoc.overall_error_count = 0; 5107 } 5108 5109 } 5110 break; 5111 case SCTP_STREAM_RESET: 5112 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5113 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5114 /* Its not ours */ 5115 if (locked_tcb) { 5116 SCTP_TCB_UNLOCK(locked_tcb); 5117 } 5118 *offset = length; 5119 return (NULL); 5120 } 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_30); 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 if (stcb->asoc.peer_supports_strreset == 0) { 5139 /* 5140 * hmm, peer should have announced this, but 5141 * we will turn it on since he is sending us 5142 * a stream reset. 5143 */ 5144 stcb->asoc.peer_supports_strreset = 1; 5145 } 5146 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5147 /* stop processing */ 5148 *offset = length; 5149 return (NULL); 5150 } 5151 break; 5152 case SCTP_PACKET_DROPPED: 5153 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5154 /* re-get it all please */ 5155 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5156 /* Its not ours */ 5157 if (locked_tcb) { 5158 SCTP_TCB_UNLOCK(locked_tcb); 5159 } 5160 *offset = length; 5161 return (NULL); 5162 } 5163 if (ch && (stcb) && netp && (*netp)) { 5164 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5165 stcb, *netp, 5166 min(chk_length, (sizeof(chunk_buf) - 4))); 5167 5168 } 5169 break; 5170 5171 case SCTP_AUTHENTICATION: 5172 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5173 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5174 goto unknown_chunk; 5175 5176 if (stcb == NULL) { 5177 /* save the first AUTH for later processing */ 5178 if (auth_skipped == 0) { 5179 auth_offset = *offset; 5180 auth_len = chk_length; 5181 auth_skipped = 1; 5182 } 5183 /* skip this chunk (temporarily) */ 5184 goto next_chunk; 5185 } 5186 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5187 (chk_length > (sizeof(struct sctp_auth_chunk) + 5188 SCTP_AUTH_DIGEST_LEN_MAX))) { 5189 /* Its not ours */ 5190 if (locked_tcb) { 5191 SCTP_TCB_UNLOCK(locked_tcb); 5192 } 5193 *offset = length; 5194 return (NULL); 5195 } 5196 if (got_auth == 1) { 5197 /* skip this chunk... it's already auth'd */ 5198 goto next_chunk; 5199 } 5200 got_auth = 1; 5201 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5202 m, *offset)) { 5203 /* auth HMAC failed so dump the packet */ 5204 *offset = length; 5205 return (stcb); 5206 } else { 5207 /* remaining chunks are HMAC checked */ 5208 stcb->asoc.authenticated = 1; 5209 } 5210 break; 5211 5212 default: 5213 unknown_chunk: 5214 /* it's an unknown chunk! */ 5215 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5216 struct mbuf *mm; 5217 struct sctp_paramhdr *phd; 5218 5219 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5220 0, M_DONTWAIT, 1, MT_DATA); 5221 if (mm) { 5222 phd = mtod(mm, struct sctp_paramhdr *); 5223 /* 5224 * We cheat and use param type since 5225 * we did not bother to define a 5226 * error cause struct. They are the 5227 * same basic format with different 5228 * names. 5229 */ 5230 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5231 phd->param_length = htons(chk_length + sizeof(*phd)); 5232 SCTP_BUF_LEN(mm) = sizeof(*phd); 5233 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5234 M_DONTWAIT); 5235 if (SCTP_BUF_NEXT(mm)) { 5236 #ifdef SCTP_MBUF_LOGGING 5237 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5238 struct mbuf *mat; 5239 5240 mat = SCTP_BUF_NEXT(mm); 5241 while (mat) { 5242 if (SCTP_BUF_IS_EXTENDED(mat)) { 5243 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5244 } 5245 mat = SCTP_BUF_NEXT(mat); 5246 } 5247 } 5248 #endif 5249 sctp_queue_op_err(stcb, mm); 5250 } else { 5251 sctp_m_freem(mm); 5252 } 5253 } 5254 } 5255 if ((ch->chunk_type & 0x80) == 0) { 5256 /* discard this packet */ 5257 *offset = length; 5258 return (stcb); 5259 } /* else skip this bad chunk and continue... */ 5260 break; 5261 } /* switch (ch->chunk_type) */ 5262 5263 5264 next_chunk: 5265 /* get the next chunk */ 5266 *offset += SCTP_SIZE32(chk_length); 5267 if (*offset >= length) { 5268 /* no more data left in the mbuf chain */ 5269 break; 5270 } 5271 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5272 sizeof(struct sctp_chunkhdr), chunk_buf); 5273 if (ch == NULL) { 5274 if (locked_tcb) { 5275 SCTP_TCB_UNLOCK(locked_tcb); 5276 } 5277 *offset = length; 5278 return (NULL); 5279 } 5280 } /* while */ 5281 5282 if (asconf_cnt > 0 && stcb != NULL) { 5283 sctp_send_asconf_ack(stcb); 5284 } 5285 return (stcb); 5286 } 5287 5288 5289 /* 5290 * Process the ECN bits we have something set so we must look to see if it is 5291 * ECN(0) or ECN(1) or CE 5292 */ 5293 static void 5294 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5295 uint8_t ecn_bits) 5296 { 5297 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5298 ; 5299 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5300 /* 5301 * we only add to the nonce sum for ECT1, ECT0 does not 5302 * change the NS bit (that we have yet to find a way to send 5303 * it yet). 5304 */ 5305 5306 /* ECN Nonce stuff */ 5307 stcb->asoc.receiver_nonce_sum++; 5308 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5309 5310 /* 5311 * Drag up the last_echo point if cumack is larger since we 5312 * don't want the point falling way behind by more than 5313 * 2^^31 and then having it be incorrect. 5314 */ 5315 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5316 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5317 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5318 } 5319 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5320 /* 5321 * Drag up the last_echo point if cumack is larger since we 5322 * don't want the point falling way behind by more than 5323 * 2^^31 and then having it be incorrect. 5324 */ 5325 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5326 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5327 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5328 } 5329 } 5330 } 5331 5332 static void 5333 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5334 uint32_t high_tsn, uint8_t ecn_bits) 5335 { 5336 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5337 /* 5338 * we possibly must notify the sender that a congestion 5339 * window reduction is in order. We do this by adding a ECNE 5340 * chunk to the output chunk queue. The incoming CWR will 5341 * remove this chunk. 5342 */ 5343 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5344 MAX_TSN)) { 5345 /* Yep, we need to add a ECNE */ 5346 sctp_send_ecn_echo(stcb, net, high_tsn); 5347 stcb->asoc.last_echo_tsn = high_tsn; 5348 } 5349 } 5350 } 5351 5352 #ifdef INVARIANTS 5353 static void 5354 sctp_validate_no_locks(struct sctp_inpcb *inp) 5355 { 5356 struct sctp_tcb *stcb; 5357 5358 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 5359 if (mtx_owned(&stcb->tcb_mtx)) { 5360 panic("Own lock on stcb at return from input"); 5361 } 5362 } 5363 } 5364 5365 #endif 5366 5367 /* 5368 * common input chunk processing (v4 and v6) 5369 */ 5370 void 5371 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5372 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5373 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5374 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5375 { 5376 /* 5377 * Control chunk processing 5378 */ 5379 uint32_t high_tsn; 5380 int fwd_tsn_seen = 0, data_processed = 0; 5381 struct mbuf *m = *mm; 5382 int abort_flag = 0; 5383 int un_sent; 5384 5385 SCTP_STAT_INCR(sctps_recvdatagrams); 5386 #ifdef SCTP_AUDITING_ENABLED 5387 sctp_audit_log(0xE0, 1); 5388 sctp_auditing(0, inp, stcb, net); 5389 #endif 5390 5391 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5392 m, iphlen, offset, length, stcb); 5393 if (stcb) { 5394 /* always clear this before beginning a packet */ 5395 stcb->asoc.authenticated = 0; 5396 stcb->asoc.seen_a_sack_this_pkt = 0; 5397 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5398 stcb, stcb->asoc.state); 5399 5400 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5401 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5402 /*- 5403 * If we hit here, we had a ref count 5404 * up when the assoc was aborted and the 5405 * timer is clearing out the assoc, we should 5406 * NOT respond to any packet.. its OOTB. 5407 */ 5408 SCTP_TCB_UNLOCK(stcb); 5409 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5410 vrf_id, port); 5411 goto out_now; 5412 } 5413 } 5414 if (IS_SCTP_CONTROL(ch)) { 5415 /* process the control portion of the SCTP packet */ 5416 /* sa_ignore NO_NULL_CHK */ 5417 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5418 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5419 if (stcb) { 5420 /* 5421 * This covers us if the cookie-echo was there and 5422 * it changes our INP. 5423 */ 5424 inp = stcb->sctp_ep; 5425 if ((net) && (port)) { 5426 if (net->port == 0) { 5427 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5428 } 5429 net->port = port; 5430 } 5431 } 5432 } else { 5433 /* 5434 * no control chunks, so pre-process DATA chunks (these 5435 * checks are taken care of by control processing) 5436 */ 5437 5438 /* 5439 * if DATA only packet, and auth is required, then punt... 5440 * can't have authenticated without any AUTH (control) 5441 * chunks 5442 */ 5443 if ((stcb != NULL) && 5444 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5445 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5446 /* "silently" ignore */ 5447 SCTP_STAT_INCR(sctps_recvauthmissing); 5448 SCTP_TCB_UNLOCK(stcb); 5449 goto out_now; 5450 } 5451 if (stcb == NULL) { 5452 /* out of the blue DATA chunk */ 5453 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5454 vrf_id, port); 5455 goto out_now; 5456 } 5457 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5458 /* v_tag mismatch! */ 5459 SCTP_STAT_INCR(sctps_badvtag); 5460 SCTP_TCB_UNLOCK(stcb); 5461 goto out_now; 5462 } 5463 } 5464 5465 if (stcb == NULL) { 5466 /* 5467 * no valid TCB for this packet, or we found it's a bad 5468 * packet while processing control, or we're done with this 5469 * packet (done or skip rest of data), so we drop it... 5470 */ 5471 goto out_now; 5472 } 5473 /* 5474 * DATA chunk processing 5475 */ 5476 /* plow through the data chunks while length > offset */ 5477 5478 /* 5479 * Rest should be DATA only. Check authentication state if AUTH for 5480 * DATA is required. 5481 */ 5482 if ((length > offset) && 5483 (stcb != NULL) && 5484 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5485 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5486 !stcb->asoc.authenticated) { 5487 /* "silently" ignore */ 5488 SCTP_STAT_INCR(sctps_recvauthmissing); 5489 SCTPDBG(SCTP_DEBUG_AUTH1, 5490 "Data chunk requires AUTH, skipped\n"); 5491 goto trigger_send; 5492 } 5493 if (length > offset) { 5494 int retval; 5495 5496 /* 5497 * First check to make sure our state is correct. We would 5498 * not get here unless we really did have a tag, so we don't 5499 * abort if this happens, just dump the chunk silently. 5500 */ 5501 switch (SCTP_GET_STATE(&stcb->asoc)) { 5502 case SCTP_STATE_COOKIE_ECHOED: 5503 /* 5504 * we consider data with valid tags in this state 5505 * shows us the cookie-ack was lost. Imply it was 5506 * there. 5507 */ 5508 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5509 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5510 stcb->asoc.overall_error_count, 5511 0, 5512 SCTP_FROM_SCTP_INPUT, 5513 __LINE__); 5514 } 5515 stcb->asoc.overall_error_count = 0; 5516 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5517 break; 5518 case SCTP_STATE_COOKIE_WAIT: 5519 /* 5520 * We consider OOTB any data sent during asoc setup. 5521 */ 5522 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5523 vrf_id, port); 5524 SCTP_TCB_UNLOCK(stcb); 5525 goto out_now; 5526 /* sa_ignore NOTREACHED */ 5527 break; 5528 case SCTP_STATE_EMPTY: /* should not happen */ 5529 case SCTP_STATE_INUSE: /* should not happen */ 5530 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5531 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5532 default: 5533 SCTP_TCB_UNLOCK(stcb); 5534 goto out_now; 5535 /* sa_ignore NOTREACHED */ 5536 break; 5537 case SCTP_STATE_OPEN: 5538 case SCTP_STATE_SHUTDOWN_SENT: 5539 break; 5540 } 5541 /* take care of ECN, part 1. */ 5542 if (stcb->asoc.ecn_allowed && 5543 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5544 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5545 } 5546 /* plow through the data chunks while length > offset */ 5547 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5548 inp, stcb, net, &high_tsn); 5549 if (retval == 2) { 5550 /* 5551 * The association aborted, NO UNLOCK needed since 5552 * the association is destroyed. 5553 */ 5554 goto out_now; 5555 } 5556 data_processed = 1; 5557 if (retval == 0) { 5558 /* take care of ecn part 2. */ 5559 if (stcb->asoc.ecn_allowed && 5560 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5561 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5562 ecn_bits); 5563 } 5564 } 5565 /* 5566 * Anything important needs to have been m_copy'ed in 5567 * process_data 5568 */ 5569 } 5570 if ((data_processed == 0) && (fwd_tsn_seen)) { 5571 int was_a_gap = 0; 5572 5573 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5574 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5575 /* there was a gap before this data was processed */ 5576 was_a_gap = 1; 5577 } 5578 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 5579 if (abort_flag) { 5580 /* Again, we aborted so NO UNLOCK needed */ 5581 goto out_now; 5582 } 5583 } 5584 /* trigger send of any chunks in queue... */ 5585 trigger_send: 5586 #ifdef SCTP_AUDITING_ENABLED 5587 sctp_audit_log(0xE0, 2); 5588 sctp_auditing(1, inp, stcb, net); 5589 #endif 5590 SCTPDBG(SCTP_DEBUG_INPUT1, 5591 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5592 stcb->asoc.peers_rwnd, 5593 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5594 stcb->asoc.total_flight); 5595 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5596 5597 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5598 ((un_sent) && 5599 (stcb->asoc.peers_rwnd > 0 || 5600 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5601 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5602 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5603 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5604 } 5605 #ifdef SCTP_AUDITING_ENABLED 5606 sctp_audit_log(0xE0, 3); 5607 sctp_auditing(2, inp, stcb, net); 5608 #endif 5609 SCTP_TCB_UNLOCK(stcb); 5610 out_now: 5611 #ifdef INVARIANTS 5612 sctp_validate_no_locks(inp); 5613 #endif 5614 return; 5615 } 5616 5617 #if 0 5618 static void 5619 sctp_print_mbuf_chain(struct mbuf *m) 5620 { 5621 for (; m; m = SCTP_BUF_NEXT(m)) { 5622 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5623 if (SCTP_BUF_IS_EXTENDED(m)) 5624 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5625 } 5626 } 5627 5628 #endif 5629 5630 void 5631 sctp_input_with_port(i_pak, off, port) 5632 struct mbuf *i_pak; 5633 int off; 5634 uint16_t port; 5635 { 5636 #ifdef SCTP_MBUF_LOGGING 5637 struct mbuf *mat; 5638 5639 #endif 5640 struct mbuf *m; 5641 int iphlen; 5642 uint32_t vrf_id = 0; 5643 uint8_t ecn_bits; 5644 struct ip *ip; 5645 struct sctphdr *sh; 5646 struct sctp_inpcb *inp = NULL; 5647 5648 uint32_t check, calc_check; 5649 struct sctp_nets *net; 5650 struct sctp_tcb *stcb = NULL; 5651 struct sctp_chunkhdr *ch; 5652 int refcount_up = 0; 5653 int length, mlen, offset; 5654 5655 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5656 SCTP_RELEASE_PKT(i_pak); 5657 return; 5658 } 5659 mlen = SCTP_HEADER_LEN(i_pak); 5660 iphlen = off; 5661 m = SCTP_HEADER_TO_CHAIN(i_pak); 5662 5663 net = NULL; 5664 SCTP_STAT_INCR(sctps_recvpackets); 5665 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5666 5667 5668 #ifdef SCTP_MBUF_LOGGING 5669 /* Log in any input mbufs */ 5670 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5671 mat = m; 5672 while (mat) { 5673 if (SCTP_BUF_IS_EXTENDED(mat)) { 5674 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5675 } 5676 mat = SCTP_BUF_NEXT(mat); 5677 } 5678 } 5679 #endif 5680 #ifdef SCTP_PACKET_LOGGING 5681 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5682 sctp_packet_log(m, mlen); 5683 #endif 5684 /* 5685 * Must take out the iphlen, since mlen expects this (only effect lb 5686 * case) 5687 */ 5688 mlen -= iphlen; 5689 5690 /* 5691 * Get IP, SCTP, and first chunk header together in first mbuf. 5692 */ 5693 ip = mtod(m, struct ip *); 5694 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5695 if (SCTP_BUF_LEN(m) < offset) { 5696 if ((m = m_pullup(m, offset)) == 0) { 5697 SCTP_STAT_INCR(sctps_hdrops); 5698 return; 5699 } 5700 ip = mtod(m, struct ip *); 5701 } 5702 /* validate mbuf chain length with IP payload length */ 5703 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5704 SCTP_STAT_INCR(sctps_hdrops); 5705 goto bad; 5706 } 5707 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5708 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5709 SCTPDBG(SCTP_DEBUG_INPUT1, 5710 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5711 5712 /* SCTP does not allow broadcasts or multicasts */ 5713 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5714 goto bad; 5715 } 5716 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5717 /* 5718 * We only look at broadcast if its a front state, All 5719 * others we will not have a tcb for anyway. 5720 */ 5721 goto bad; 5722 } 5723 /* validate SCTP checksum */ 5724 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5725 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5726 m->m_pkthdr.len, 5727 if_name(m->m_pkthdr.rcvif), 5728 m->m_pkthdr.csum_flags); 5729 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5730 SCTP_STAT_INCR(sctps_recvhwcrc); 5731 goto sctp_skip_csum_4; 5732 } 5733 check = sh->checksum; /* save incoming checksum */ 5734 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5735 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5736 (SCTP_IS_IT_LOOPBACK(m))) 5737 ) { 5738 SCTP_STAT_INCR(sctps_recvnocrc); 5739 goto sctp_skip_csum_4; 5740 } 5741 sh->checksum = 0; /* prepare for calc */ 5742 calc_check = sctp_calculate_cksum(m, iphlen); 5743 SCTP_STAT_INCR(sctps_recvswcrc); 5744 if (calc_check != check) { 5745 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5746 calc_check, check, m, mlen, iphlen); 5747 5748 stcb = sctp_findassociation_addr(m, iphlen, 5749 offset - sizeof(*ch), 5750 sh, ch, &inp, &net, 5751 vrf_id); 5752 if ((net) && (port)) { 5753 if (net->port == 0) { 5754 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5755 } 5756 net->port = port; 5757 } 5758 if ((inp) && (stcb)) { 5759 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5760 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5761 } else if ((inp != NULL) && (stcb == NULL)) { 5762 refcount_up = 1; 5763 } 5764 SCTP_STAT_INCR(sctps_badsum); 5765 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5766 goto bad; 5767 } 5768 sh->checksum = calc_check; 5769 sctp_skip_csum_4: 5770 /* destination port of 0 is illegal, based on RFC2960. */ 5771 if (sh->dest_port == 0) { 5772 SCTP_STAT_INCR(sctps_hdrops); 5773 goto bad; 5774 } 5775 /* 5776 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5777 * IP/SCTP/first chunk header... 5778 */ 5779 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5780 sh, ch, &inp, &net, vrf_id); 5781 if ((net) && (port)) { 5782 if (net->port == 0) { 5783 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5784 } 5785 net->port = port; 5786 } 5787 /* inp's ref-count increased && stcb locked */ 5788 if (inp == NULL) { 5789 struct sctp_init_chunk *init_chk, chunk_buf; 5790 5791 SCTP_STAT_INCR(sctps_noport); 5792 #ifdef ICMP_BANDLIM 5793 /* 5794 * we use the bandwidth limiting to protect against sending 5795 * too many ABORTS all at once. In this case these count the 5796 * same as an ICMP message. 5797 */ 5798 if (badport_bandlim(0) < 0) 5799 goto bad; 5800 #endif /* ICMP_BANDLIM */ 5801 SCTPDBG(SCTP_DEBUG_INPUT1, 5802 "Sending a ABORT from packet entry!\n"); 5803 if (ch->chunk_type == SCTP_INITIATION) { 5804 /* 5805 * we do a trick here to get the INIT tag, dig in 5806 * and get the tag from the INIT and put it in the 5807 * common header. 5808 */ 5809 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5810 iphlen + sizeof(*sh), sizeof(*init_chk), 5811 (uint8_t *) & chunk_buf); 5812 if (init_chk != NULL) 5813 sh->v_tag = init_chk->init.initiate_tag; 5814 } 5815 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5816 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5817 goto bad; 5818 } 5819 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5820 goto bad; 5821 } 5822 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5823 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5824 goto bad; 5825 } else if (stcb == NULL) { 5826 refcount_up = 1; 5827 } 5828 #ifdef IPSEC 5829 /* 5830 * I very much doubt any of the IPSEC stuff will work but I have no 5831 * idea, so I will leave it in place. 5832 */ 5833 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5834 MODULE_GLOBAL(MOD_IPSEC, ipsec4stat).in_polvio++; 5835 SCTP_STAT_INCR(sctps_hdrops); 5836 goto bad; 5837 } 5838 #endif /* IPSEC */ 5839 5840 /* 5841 * common chunk processing 5842 */ 5843 length = ip->ip_len + iphlen; 5844 offset -= sizeof(struct sctp_chunkhdr); 5845 5846 ecn_bits = ip->ip_tos; 5847 5848 /* sa_ignore NO_NULL_CHK */ 5849 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5850 inp, stcb, net, ecn_bits, vrf_id, port); 5851 /* inp's ref-count reduced && stcb unlocked */ 5852 if (m) { 5853 sctp_m_freem(m); 5854 } 5855 if ((inp) && (refcount_up)) { 5856 /* reduce ref-count */ 5857 SCTP_INP_DECR_REF(inp); 5858 } 5859 return; 5860 bad: 5861 if (stcb) { 5862 SCTP_TCB_UNLOCK(stcb); 5863 } 5864 if ((inp) && (refcount_up)) { 5865 /* reduce ref-count */ 5866 SCTP_INP_DECR_REF(inp); 5867 } 5868 if (m) { 5869 sctp_m_freem(m); 5870 } 5871 return; 5872 } 5873 void 5874 sctp_input(i_pak, off) 5875 struct mbuf *i_pak; 5876 int off; 5877 { 5878 sctp_input_with_port(i_pak, off, 0); 5879 } 5880