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, *nsp; 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 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 209 /* sa_ignore FREED_MEMORY */ 210 TAILQ_FOREACH_SAFE(sp, &strq->outqueue, next, nsp) { 211 if ((sp->msg_is_complete) && 212 (sp->length == 0) && 213 (sp->sender_all_done)) { 214 /* 215 * We are doing differed cleanup. Last time 216 * through when we took all the data the 217 * sender_all_done was not set. 218 */ 219 if (sp->put_last_out == 0) { 220 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 221 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 222 sp->sender_all_done, 223 sp->length, 224 sp->msg_is_complete, 225 sp->put_last_out); 226 } 227 atomic_subtract_int(&asoc->stream_queue_cnt, 1); 228 TAILQ_REMOVE(&strq->outqueue, sp, next); 229 if (sp->net) { 230 sctp_free_remote_addr(sp->net); 231 sp->net = NULL; 232 } 233 if (sp->data) { 234 sctp_m_freem(sp->data); 235 sp->data = NULL; 236 } 237 sctp_free_a_strmoq(stcb, sp); 238 } else { 239 unsent_data++; 240 break; 241 } 242 } 243 } 244 SCTP_TCB_SEND_UNLOCK(stcb); 245 return (unsent_data); 246 } 247 248 static int 249 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 250 struct sctp_nets *net) 251 { 252 struct sctp_init *init; 253 struct sctp_association *asoc; 254 struct sctp_nets *lnet; 255 unsigned int i; 256 257 init = &cp->init; 258 asoc = &stcb->asoc; 259 /* save off parameters */ 260 asoc->peer_vtag = ntohl(init->initiate_tag); 261 asoc->peers_rwnd = ntohl(init->a_rwnd); 262 if (!TAILQ_EMPTY(&asoc->nets)) { 263 /* update any ssthresh's that may have a default */ 264 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 265 lnet->ssthresh = asoc->peers_rwnd; 266 267 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 268 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 269 } 270 } 271 } 272 SCTP_TCB_SEND_LOCK(stcb); 273 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 274 unsigned int newcnt; 275 struct sctp_stream_out *outs; 276 struct sctp_stream_queue_pending *sp, *nsp; 277 struct sctp_tmit_chunk *chk, *nchk; 278 279 /* abandon the upper streams */ 280 newcnt = ntohs(init->num_inbound_streams); 281 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 282 if (chk->rec.data.stream_number >= newcnt) { 283 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 284 asoc->send_queue_cnt--; 285 if (chk->data != NULL) { 286 sctp_free_bufspace(stcb, asoc, chk, 1); 287 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 288 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 289 if (chk->data) { 290 sctp_m_freem(chk->data); 291 chk->data = NULL; 292 } 293 } 294 sctp_free_a_chunk(stcb, chk); 295 /* sa_ignore FREED_MEMORY */ 296 } 297 } 298 if (asoc->strmout) { 299 for (i = newcnt; i < asoc->pre_open_streams; i++) { 300 outs = &asoc->strmout[i]; 301 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 302 TAILQ_REMOVE(&outs->outqueue, sp, next); 303 asoc->stream_queue_cnt--; 304 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 305 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 306 sp, SCTP_SO_NOT_LOCKED); 307 if (sp->data) { 308 sctp_m_freem(sp->data); 309 sp->data = NULL; 310 } 311 if (sp->net) { 312 sctp_free_remote_addr(sp->net); 313 sp->net = NULL; 314 } 315 /* Free the chunk */ 316 sctp_free_a_strmoq(stcb, sp); 317 /* sa_ignore FREED_MEMORY */ 318 } 319 } 320 } 321 /* cut back the count */ 322 asoc->pre_open_streams = newcnt; 323 } 324 SCTP_TCB_SEND_UNLOCK(stcb); 325 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 326 /* init tsn's */ 327 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 328 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 329 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 330 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 331 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 332 } 333 /* This is the next one we expect */ 334 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 335 336 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 337 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 338 asoc->last_echo_tsn = asoc->asconf_seq_in; 339 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 340 /* open the requested streams */ 341 342 if (asoc->strmin != NULL) { 343 /* Free the old ones */ 344 struct sctp_queued_to_read *ctl, *nctl; 345 346 for (i = 0; i < asoc->streamincnt; i++) { 347 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 348 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 349 sctp_free_remote_addr(ctl->whoFrom); 350 ctl->whoFrom = NULL; 351 sctp_m_freem(ctl->data); 352 ctl->data = NULL; 353 sctp_free_a_readq(stcb, ctl); 354 } 355 } 356 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 357 } 358 asoc->streamincnt = ntohs(init->num_outbound_streams); 359 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 360 asoc->streamincnt = MAX_SCTP_STREAMS; 361 } 362 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 363 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 364 if (asoc->strmin == NULL) { 365 /* we didn't get memory for the streams! */ 366 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 367 return (-1); 368 } 369 for (i = 0; i < asoc->streamincnt; i++) { 370 asoc->strmin[i].stream_no = i; 371 asoc->strmin[i].last_sequence_delivered = 0xffff; 372 /* 373 * U-stream ranges will be set when the cookie is unpacked. 374 * Or for the INIT sender they are un set (if pr-sctp not 375 * supported) when the INIT-ACK arrives. 376 */ 377 TAILQ_INIT(&asoc->strmin[i].inqueue); 378 asoc->strmin[i].delivery_started = 0; 379 } 380 /* 381 * load_address_from_init will put the addresses into the 382 * association when the COOKIE is processed or the INIT-ACK is 383 * processed. Both types of COOKIE's existing and new call this 384 * routine. It will remove addresses that are no longer in the 385 * association (for the restarting case where addresses are 386 * removed). Up front when the INIT arrives we will discard it if it 387 * is a restart and new addresses have been added. 388 */ 389 /* sa_ignore MEMLEAK */ 390 return (0); 391 } 392 393 /* 394 * INIT-ACK message processing/consumption returns value < 0 on error 395 */ 396 static int 397 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 398 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 399 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 400 { 401 struct sctp_association *asoc; 402 struct mbuf *op_err; 403 int retval, abort_flag; 404 uint32_t initack_limit; 405 int nat_friendly = 0; 406 407 /* First verify that we have no illegal param's */ 408 abort_flag = 0; 409 op_err = NULL; 410 411 op_err = sctp_arethere_unrecognized_parameters(m, 412 (offset + sizeof(struct sctp_init_chunk)), 413 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 414 if (abort_flag) { 415 /* Send an abort and notify peer */ 416 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 417 *abort_no_unlock = 1; 418 return (-1); 419 } 420 asoc = &stcb->asoc; 421 asoc->peer_supports_nat = (uint8_t) nat_friendly; 422 /* process the peer's parameters in the INIT-ACK */ 423 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 424 if (retval < 0) { 425 return (retval); 426 } 427 initack_limit = offset + ntohs(cp->ch.chunk_length); 428 /* load all addresses */ 429 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 430 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 431 NULL))) { 432 /* Huh, we should abort */ 433 SCTPDBG(SCTP_DEBUG_INPUT1, 434 "Load addresses from INIT causes an abort %d\n", 435 retval); 436 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 437 NULL, 0, net->port); 438 *abort_no_unlock = 1; 439 return (-1); 440 } 441 /* if the peer doesn't support asconf, flush the asconf queue */ 442 if (asoc->peer_supports_asconf == 0) { 443 struct sctp_asconf_addr *param, *nparam; 444 445 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 446 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 447 SCTP_FREE(param, SCTP_M_ASC_ADDR); 448 } 449 } 450 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 451 stcb->asoc.local_hmacs); 452 if (op_err) { 453 sctp_queue_op_err(stcb, op_err); 454 /* queuing will steal away the mbuf chain to the out queue */ 455 op_err = NULL; 456 } 457 /* extract the cookie and queue it to "echo" it back... */ 458 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 459 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 460 stcb->asoc.overall_error_count, 461 0, 462 SCTP_FROM_SCTP_INPUT, 463 __LINE__); 464 } 465 stcb->asoc.overall_error_count = 0; 466 net->error_count = 0; 467 468 /* 469 * Cancel the INIT timer, We do this first before queueing the 470 * cookie. We always cancel at the primary to assue that we are 471 * canceling the timer started by the INIT which always goes to the 472 * primary. 473 */ 474 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 475 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 476 477 /* calculate the RTO */ 478 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 479 480 retval = sctp_send_cookie_echo(m, offset, stcb, net); 481 if (retval < 0) { 482 /* 483 * No cookie, we probably should send a op error. But in any 484 * case if there is no cookie in the INIT-ACK, we can 485 * abandon the peer, its broke. 486 */ 487 if (retval == -3) { 488 /* We abort with an error of missing mandatory param */ 489 op_err = 490 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 491 if (op_err) { 492 /* 493 * Expand beyond to include the mandatory 494 * param cookie 495 */ 496 struct sctp_inv_mandatory_param *mp; 497 498 SCTP_BUF_LEN(op_err) = 499 sizeof(struct sctp_inv_mandatory_param); 500 mp = mtod(op_err, 501 struct sctp_inv_mandatory_param *); 502 /* Subtract the reserved param */ 503 mp->length = 504 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 505 mp->num_param = htonl(1); 506 mp->param = htons(SCTP_STATE_COOKIE); 507 mp->resv = 0; 508 } 509 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 510 sh, op_err, 0, net->port); 511 *abort_no_unlock = 1; 512 } 513 return (retval); 514 } 515 return (0); 516 } 517 518 static void 519 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 520 struct sctp_tcb *stcb, struct sctp_nets *net) 521 { 522 struct sockaddr_storage store; 523 struct sockaddr_in *sin; 524 struct sockaddr_in6 *sin6; 525 struct sctp_nets *r_net, *f_net; 526 struct timeval tv; 527 int req_prim = 0; 528 529 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 530 /* Invalid length */ 531 return; 532 } 533 sin = (struct sockaddr_in *)&store; 534 sin6 = (struct sockaddr_in6 *)&store; 535 536 memset(&store, 0, sizeof(store)); 537 if (cp->heartbeat.hb_info.addr_family == AF_INET && 538 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 539 sin->sin_family = cp->heartbeat.hb_info.addr_family; 540 sin->sin_len = cp->heartbeat.hb_info.addr_len; 541 sin->sin_port = stcb->rport; 542 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 543 sizeof(sin->sin_addr)); 544 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 545 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 546 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 547 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 548 sin6->sin6_port = stcb->rport; 549 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 550 sizeof(sin6->sin6_addr)); 551 } else { 552 return; 553 } 554 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 555 if (r_net == NULL) { 556 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 557 return; 558 } 559 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 560 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 561 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 562 /* 563 * If the its a HB and it's random value is correct when can 564 * confirm the destination. 565 */ 566 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 567 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 568 stcb->asoc.primary_destination = r_net; 569 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 570 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 571 f_net = TAILQ_FIRST(&stcb->asoc.nets); 572 if (f_net != r_net) { 573 /* 574 * first one on the list is NOT the primary 575 * sctp_cmpaddr() is much more efficent if 576 * the primary is the first on the list, 577 * make it so. 578 */ 579 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 580 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 581 } 582 req_prim = 1; 583 } 584 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 585 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 586 } 587 r_net->error_count = 0; 588 r_net->hb_responded = 1; 589 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 590 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 591 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 592 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 593 r_net->dest_state |= SCTP_ADDR_REACHABLE; 594 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 595 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 596 /* now was it the primary? if so restore */ 597 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 598 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 599 } 600 } 601 /* 602 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 603 * set the destination to active state and set the cwnd to one or 604 * two MTU's based on whether PF1 or PF2 is being used. If a T3 605 * timer is running, for the destination, stop the timer because a 606 * PF-heartbeat was received. 607 */ 608 if ((stcb->asoc.sctp_cmt_on_off > 0) && 609 (stcb->asoc.sctp_cmt_pf > 0) && 610 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 611 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 612 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 613 stcb, net, 614 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 615 } 616 net->dest_state &= ~SCTP_ADDR_PF; 617 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf; 618 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 619 net, net->cwnd); 620 } 621 /* Now lets do a RTO with this */ 622 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 623 /* Mobility adaptation */ 624 if (req_prim) { 625 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 626 SCTP_MOBILITY_BASE) || 627 sctp_is_mobility_feature_on(stcb->sctp_ep, 628 SCTP_MOBILITY_FASTHANDOFF)) && 629 sctp_is_mobility_feature_on(stcb->sctp_ep, 630 SCTP_MOBILITY_PRIM_DELETED)) { 631 632 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 633 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 634 SCTP_MOBILITY_FASTHANDOFF)) { 635 sctp_assoc_immediate_retrans(stcb, 636 stcb->asoc.primary_destination); 637 } 638 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 639 SCTP_MOBILITY_BASE)) { 640 sctp_move_chunks_from_net(stcb, 641 stcb->asoc.deleted_primary); 642 } 643 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 644 stcb->asoc.deleted_primary); 645 } 646 } 647 } 648 649 static int 650 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 651 { 652 /* 653 * return 0 means we want you to proceed with the abort non-zero 654 * means no abort processing 655 */ 656 struct sctpasochead *head; 657 658 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 659 /* generate a new vtag and send init */ 660 LIST_REMOVE(stcb, sctp_asocs); 661 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 662 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 663 /* 664 * put it in the bucket in the vtag hash of assoc's for the 665 * system 666 */ 667 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 668 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 669 return (1); 670 } 671 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 672 /* 673 * treat like a case where the cookie expired i.e.: - dump 674 * current cookie. - generate a new vtag. - resend init. 675 */ 676 /* generate a new vtag and send init */ 677 LIST_REMOVE(stcb, sctp_asocs); 678 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 679 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 680 sctp_stop_all_cookie_timers(stcb); 681 sctp_toss_old_cookies(stcb, &stcb->asoc); 682 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 683 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 684 /* 685 * put it in the bucket in the vtag hash of assoc's for the 686 * system 687 */ 688 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 689 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 690 return (1); 691 } 692 return (0); 693 } 694 695 static int 696 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 697 struct sctp_nets *net) 698 { 699 /* 700 * return 0 means we want you to proceed with the abort non-zero 701 * means no abort processing 702 */ 703 if (stcb->asoc.peer_supports_auth == 0) { 704 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 705 return (0); 706 } 707 sctp_asconf_send_nat_state_update(stcb, net); 708 return (1); 709 } 710 711 712 static void 713 sctp_handle_abort(struct sctp_abort_chunk *cp, 714 struct sctp_tcb *stcb, struct sctp_nets *net) 715 { 716 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 717 struct socket *so; 718 719 #endif 720 uint16_t len; 721 722 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 723 if (stcb == NULL) 724 return; 725 726 len = ntohs(cp->ch.chunk_length); 727 if (len > sizeof(struct sctp_chunkhdr)) { 728 /* 729 * Need to check the cause codes for our two magic nat 730 * aborts which don't kill the assoc necessarily. 731 */ 732 struct sctp_abort_chunk *cpnext; 733 struct sctp_missing_nat_state *natc; 734 uint16_t cause; 735 736 cpnext = cp; 737 cpnext++; 738 natc = (struct sctp_missing_nat_state *)cpnext; 739 cause = ntohs(natc->cause); 740 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 741 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 742 cp->ch.chunk_flags); 743 if (sctp_handle_nat_colliding_state(stcb)) { 744 return; 745 } 746 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 747 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 748 cp->ch.chunk_flags); 749 if (sctp_handle_nat_missing_state(stcb, net)) { 750 return; 751 } 752 } 753 } 754 /* stop any receive timers */ 755 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 756 /* notify user of the abort and clean up... */ 757 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 758 /* free the tcb */ 759 #if defined(SCTP_PANIC_ON_ABORT) 760 printf("stcb:%p state:%d rport:%d net:%p\n", 761 stcb, stcb->asoc.state, stcb->rport, net); 762 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 763 panic("Received an ABORT"); 764 } else { 765 printf("No panic its in state %x closed\n", stcb->asoc.state); 766 } 767 #endif 768 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 769 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 770 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 771 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 772 } 773 #ifdef SCTP_ASOCLOG_OF_TSNS 774 sctp_print_out_track_log(stcb); 775 #endif 776 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 777 so = SCTP_INP_SO(stcb->sctp_ep); 778 atomic_add_int(&stcb->asoc.refcnt, 1); 779 SCTP_TCB_UNLOCK(stcb); 780 SCTP_SOCKET_LOCK(so, 1); 781 SCTP_TCB_LOCK(stcb); 782 atomic_subtract_int(&stcb->asoc.refcnt, 1); 783 #endif 784 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 785 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 788 SCTP_SOCKET_UNLOCK(so, 1); 789 #endif 790 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 791 } 792 793 static void 794 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 795 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 796 { 797 struct sctp_association *asoc; 798 int some_on_streamwheel; 799 800 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 801 struct socket *so; 802 803 #endif 804 805 SCTPDBG(SCTP_DEBUG_INPUT2, 806 "sctp_handle_shutdown: handling SHUTDOWN\n"); 807 if (stcb == NULL) 808 return; 809 asoc = &stcb->asoc; 810 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 811 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 812 return; 813 } 814 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 815 /* Shutdown NOT the expected size */ 816 return; 817 } else { 818 sctp_update_acked(stcb, cp, net, abort_flag); 819 if (*abort_flag) { 820 return; 821 } 822 } 823 if (asoc->control_pdapi) { 824 /* 825 * With a normal shutdown we assume the end of last record. 826 */ 827 SCTP_INP_READ_LOCK(stcb->sctp_ep); 828 asoc->control_pdapi->end_added = 1; 829 asoc->control_pdapi->pdapi_aborted = 1; 830 asoc->control_pdapi = NULL; 831 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 832 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 833 so = SCTP_INP_SO(stcb->sctp_ep); 834 atomic_add_int(&stcb->asoc.refcnt, 1); 835 SCTP_TCB_UNLOCK(stcb); 836 SCTP_SOCKET_LOCK(so, 1); 837 SCTP_TCB_LOCK(stcb); 838 atomic_subtract_int(&stcb->asoc.refcnt, 1); 839 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 840 /* assoc was freed while we were unlocked */ 841 SCTP_SOCKET_UNLOCK(so, 1); 842 return; 843 } 844 #endif 845 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 846 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 847 SCTP_SOCKET_UNLOCK(so, 1); 848 #endif 849 } 850 /* goto SHUTDOWN_RECEIVED state to block new requests */ 851 if (stcb->sctp_socket) { 852 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 853 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 854 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 855 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 856 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 857 /* 858 * notify upper layer that peer has initiated a 859 * shutdown 860 */ 861 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 862 863 /* reset time */ 864 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 865 } 866 } 867 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 868 /* 869 * stop the shutdown timer, since we WILL move to 870 * SHUTDOWN-ACK-SENT. 871 */ 872 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 873 } 874 /* Now is there unsent data on a stream somewhere? */ 875 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 876 877 if (!TAILQ_EMPTY(&asoc->send_queue) || 878 !TAILQ_EMPTY(&asoc->sent_queue) || 879 some_on_streamwheel) { 880 /* By returning we will push more data out */ 881 return; 882 } else { 883 /* no outstanding data to send, so move on... */ 884 /* send SHUTDOWN-ACK */ 885 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 886 /* move to SHUTDOWN-ACK-SENT state */ 887 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 888 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 889 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 890 } 891 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 892 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 893 sctp_stop_timers_for_shutdown(stcb); 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, 902 struct sctp_nets *net) 903 { 904 struct sctp_association *asoc; 905 906 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 907 struct socket *so; 908 909 so = SCTP_INP_SO(stcb->sctp_ep); 910 #endif 911 SCTPDBG(SCTP_DEBUG_INPUT2, 912 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 913 if (stcb == NULL) 914 return; 915 916 asoc = &stcb->asoc; 917 /* process according to association state */ 918 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 919 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 920 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 921 sctp_send_shutdown_complete(stcb, net, 1); 922 SCTP_TCB_UNLOCK(stcb); 923 return; 924 } 925 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 926 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 927 /* unexpected SHUTDOWN-ACK... so ignore... */ 928 SCTP_TCB_UNLOCK(stcb); 929 return; 930 } 931 if (asoc->control_pdapi) { 932 /* 933 * With a normal shutdown we assume the end of last record. 934 */ 935 SCTP_INP_READ_LOCK(stcb->sctp_ep); 936 asoc->control_pdapi->end_added = 1; 937 asoc->control_pdapi->pdapi_aborted = 1; 938 asoc->control_pdapi = NULL; 939 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 940 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 941 atomic_add_int(&stcb->asoc.refcnt, 1); 942 SCTP_TCB_UNLOCK(stcb); 943 SCTP_SOCKET_LOCK(so, 1); 944 SCTP_TCB_LOCK(stcb); 945 atomic_subtract_int(&stcb->asoc.refcnt, 1); 946 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 947 /* assoc was freed while we were unlocked */ 948 SCTP_SOCKET_UNLOCK(so, 1); 949 return; 950 } 951 #endif 952 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 953 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 954 SCTP_SOCKET_UNLOCK(so, 1); 955 #endif 956 } 957 /* are the queues empty? */ 958 if (!TAILQ_EMPTY(&asoc->send_queue) || 959 !TAILQ_EMPTY(&asoc->sent_queue) || 960 !TAILQ_EMPTY(&asoc->out_wheel)) { 961 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 962 } 963 /* stop the timer */ 964 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 965 /* send SHUTDOWN-COMPLETE */ 966 sctp_send_shutdown_complete(stcb, net, 0); 967 /* notify upper layer protocol */ 968 if (stcb->sctp_socket) { 969 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 970 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 971 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 972 /* Set the connected flag to disconnected */ 973 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 974 } 975 } 976 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 977 /* free the TCB but first save off the ep */ 978 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 979 atomic_add_int(&stcb->asoc.refcnt, 1); 980 SCTP_TCB_UNLOCK(stcb); 981 SCTP_SOCKET_LOCK(so, 1); 982 SCTP_TCB_LOCK(stcb); 983 atomic_subtract_int(&stcb->asoc.refcnt, 1); 984 #endif 985 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 986 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 987 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 988 SCTP_SOCKET_UNLOCK(so, 1); 989 #endif 990 } 991 992 /* 993 * Skip past the param header and then we will find the chunk that caused the 994 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 995 * our peer must be broken. 996 */ 997 static void 998 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 999 struct sctp_nets *net) 1000 { 1001 struct sctp_chunkhdr *chk; 1002 1003 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1004 switch (chk->chunk_type) { 1005 case SCTP_ASCONF_ACK: 1006 case SCTP_ASCONF: 1007 sctp_asconf_cleanup(stcb, net); 1008 break; 1009 case SCTP_FORWARD_CUM_TSN: 1010 stcb->asoc.peer_supports_prsctp = 0; 1011 break; 1012 default: 1013 SCTPDBG(SCTP_DEBUG_INPUT2, 1014 "Peer does not support chunk type %d(%x)??\n", 1015 chk->chunk_type, (uint32_t) chk->chunk_type); 1016 break; 1017 } 1018 } 1019 1020 /* 1021 * Skip past the param header and then we will find the param that caused the 1022 * problem. There are a number of param's in a ASCONF OR the prsctp param 1023 * these will turn of specific features. 1024 */ 1025 static void 1026 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1027 { 1028 struct sctp_paramhdr *pbad; 1029 1030 pbad = phdr + 1; 1031 switch (ntohs(pbad->param_type)) { 1032 /* pr-sctp draft */ 1033 case SCTP_PRSCTP_SUPPORTED: 1034 stcb->asoc.peer_supports_prsctp = 0; 1035 break; 1036 case SCTP_SUPPORTED_CHUNK_EXT: 1037 break; 1038 /* draft-ietf-tsvwg-addip-sctp */ 1039 case SCTP_HAS_NAT_SUPPORT: 1040 stcb->asoc.peer_supports_nat = 0; 1041 break; 1042 case SCTP_ECN_NONCE_SUPPORTED: 1043 stcb->asoc.peer_supports_ecn_nonce = 0; 1044 stcb->asoc.ecn_nonce_allowed = 0; 1045 stcb->asoc.ecn_allowed = 0; 1046 break; 1047 case SCTP_ADD_IP_ADDRESS: 1048 case SCTP_DEL_IP_ADDRESS: 1049 case SCTP_SET_PRIM_ADDR: 1050 stcb->asoc.peer_supports_asconf = 0; 1051 break; 1052 case SCTP_SUCCESS_REPORT: 1053 case SCTP_ERROR_CAUSE_IND: 1054 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1055 SCTPDBG(SCTP_DEBUG_INPUT2, 1056 "Turning off ASCONF to this strange peer\n"); 1057 stcb->asoc.peer_supports_asconf = 0; 1058 break; 1059 default: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, 1061 "Peer does not support param type %d(%x)??\n", 1062 pbad->param_type, (uint32_t) pbad->param_type); 1063 break; 1064 } 1065 } 1066 1067 static int 1068 sctp_handle_error(struct sctp_chunkhdr *ch, 1069 struct sctp_tcb *stcb, struct sctp_nets *net) 1070 { 1071 int chklen; 1072 struct sctp_paramhdr *phdr; 1073 uint16_t error_type; 1074 uint16_t error_len; 1075 struct sctp_association *asoc; 1076 int adjust; 1077 1078 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1079 struct socket *so; 1080 1081 #endif 1082 1083 /* parse through all of the errors and process */ 1084 asoc = &stcb->asoc; 1085 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1086 sizeof(struct sctp_chunkhdr)); 1087 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1088 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1089 /* Process an Error Cause */ 1090 error_type = ntohs(phdr->param_type); 1091 error_len = ntohs(phdr->param_length); 1092 if ((error_len > chklen) || (error_len == 0)) { 1093 /* invalid param length for this param */ 1094 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1095 chklen, error_len); 1096 return (0); 1097 } 1098 switch (error_type) { 1099 case SCTP_CAUSE_INVALID_STREAM: 1100 case SCTP_CAUSE_MISSING_PARAM: 1101 case SCTP_CAUSE_INVALID_PARAM: 1102 case SCTP_CAUSE_NO_USER_DATA: 1103 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1104 error_type); 1105 break; 1106 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1107 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1108 ch->chunk_flags); 1109 if (sctp_handle_nat_colliding_state(stcb)) { 1110 return (0); 1111 } 1112 break; 1113 case SCTP_CAUSE_NAT_MISSING_STATE: 1114 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1115 ch->chunk_flags); 1116 if (sctp_handle_nat_missing_state(stcb, net)) { 1117 return (0); 1118 } 1119 break; 1120 case SCTP_CAUSE_STALE_COOKIE: 1121 /* 1122 * We only act if we have echoed a cookie and are 1123 * waiting. 1124 */ 1125 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1126 int *p; 1127 1128 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1129 /* Save the time doubled */ 1130 asoc->cookie_preserve_req = ntohl(*p) << 1; 1131 asoc->stale_cookie_count++; 1132 if (asoc->stale_cookie_count > 1133 asoc->max_init_times) { 1134 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1135 /* now free the asoc */ 1136 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1137 so = SCTP_INP_SO(stcb->sctp_ep); 1138 atomic_add_int(&stcb->asoc.refcnt, 1); 1139 SCTP_TCB_UNLOCK(stcb); 1140 SCTP_SOCKET_LOCK(so, 1); 1141 SCTP_TCB_LOCK(stcb); 1142 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1143 #endif 1144 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1145 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1146 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1147 SCTP_SOCKET_UNLOCK(so, 1); 1148 #endif 1149 return (-1); 1150 } 1151 /* blast back to INIT state */ 1152 sctp_toss_old_cookies(stcb, &stcb->asoc); 1153 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1154 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1155 sctp_stop_all_cookie_timers(stcb); 1156 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1157 } 1158 break; 1159 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1160 /* 1161 * Nothing we can do here, we don't do hostname 1162 * addresses so if the peer does not like my IPv6 1163 * (or IPv4 for that matter) it does not matter. If 1164 * they don't support that type of address, they can 1165 * NOT possibly get that packet type... i.e. with no 1166 * IPv6 you can't recieve a IPv6 packet. so we can 1167 * safely ignore this one. If we ever added support 1168 * for HOSTNAME Addresses, then we would need to do 1169 * something here. 1170 */ 1171 break; 1172 case SCTP_CAUSE_UNRECOG_CHUNK: 1173 sctp_process_unrecog_chunk(stcb, phdr, net); 1174 break; 1175 case SCTP_CAUSE_UNRECOG_PARAM: 1176 sctp_process_unrecog_param(stcb, phdr); 1177 break; 1178 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1179 /* 1180 * We ignore this since the timer will drive out a 1181 * new cookie anyway and there timer will drive us 1182 * to send a SHUTDOWN_COMPLETE. We can't send one 1183 * here since we don't have their tag. 1184 */ 1185 break; 1186 case SCTP_CAUSE_DELETING_LAST_ADDR: 1187 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1188 case SCTP_CAUSE_DELETING_SRC_ADDR: 1189 /* 1190 * We should NOT get these here, but in a 1191 * ASCONF-ACK. 1192 */ 1193 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1194 error_type); 1195 break; 1196 case SCTP_CAUSE_OUT_OF_RESC: 1197 /* 1198 * And what, pray tell do we do with the fact that 1199 * the peer is out of resources? Not really sure we 1200 * could do anything but abort. I suspect this 1201 * should have came WITH an abort instead of in a 1202 * OP-ERROR. 1203 */ 1204 break; 1205 default: 1206 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1207 error_type); 1208 break; 1209 } 1210 adjust = SCTP_SIZE32(error_len); 1211 chklen -= adjust; 1212 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1213 } 1214 return (0); 1215 } 1216 1217 static int 1218 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1219 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1220 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1221 { 1222 struct sctp_init_ack *init_ack; 1223 struct mbuf *op_err; 1224 1225 SCTPDBG(SCTP_DEBUG_INPUT2, 1226 "sctp_handle_init_ack: handling INIT-ACK\n"); 1227 1228 if (stcb == NULL) { 1229 SCTPDBG(SCTP_DEBUG_INPUT2, 1230 "sctp_handle_init_ack: TCB is null\n"); 1231 return (-1); 1232 } 1233 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1234 /* Invalid length */ 1235 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1236 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1237 op_err, 0, net->port); 1238 *abort_no_unlock = 1; 1239 return (-1); 1240 } 1241 init_ack = &cp->init; 1242 /* validate parameters */ 1243 if (init_ack->initiate_tag == 0) { 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 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 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_inbound_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 if (init_ack->num_outbound_streams == 0) { 1268 /* protocol error... send an abort */ 1269 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1270 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1271 op_err, 0, net->port); 1272 *abort_no_unlock = 1; 1273 return (-1); 1274 } 1275 /* process according to association state... */ 1276 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1277 case SCTP_STATE_COOKIE_WAIT: 1278 /* this is the expected state for this chunk */ 1279 /* process the INIT-ACK parameters */ 1280 if (stcb->asoc.primary_destination->dest_state & 1281 SCTP_ADDR_UNCONFIRMED) { 1282 /* 1283 * The primary is where we sent the INIT, we can 1284 * always consider it confirmed when the INIT-ACK is 1285 * returned. Do this before we load addresses 1286 * though. 1287 */ 1288 stcb->asoc.primary_destination->dest_state &= 1289 ~SCTP_ADDR_UNCONFIRMED; 1290 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1291 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1292 } 1293 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1294 net, abort_no_unlock, vrf_id) < 0) { 1295 /* error in parsing parameters */ 1296 return (-1); 1297 } 1298 /* update our state */ 1299 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1300 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1301 1302 /* reset the RTO calc */ 1303 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1304 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1305 stcb->asoc.overall_error_count, 1306 0, 1307 SCTP_FROM_SCTP_INPUT, 1308 __LINE__); 1309 } 1310 stcb->asoc.overall_error_count = 0; 1311 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1312 /* 1313 * collapse the init timer back in case of a exponential 1314 * backoff 1315 */ 1316 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1317 stcb, net); 1318 /* 1319 * the send at the end of the inbound data processing will 1320 * cause the cookie to be sent 1321 */ 1322 break; 1323 case SCTP_STATE_SHUTDOWN_SENT: 1324 /* incorrect state... discard */ 1325 break; 1326 case SCTP_STATE_COOKIE_ECHOED: 1327 /* incorrect state... discard */ 1328 break; 1329 case SCTP_STATE_OPEN: 1330 /* incorrect state... discard */ 1331 break; 1332 case SCTP_STATE_EMPTY: 1333 case SCTP_STATE_INUSE: 1334 default: 1335 /* incorrect state... discard */ 1336 return (-1); 1337 break; 1338 } 1339 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1340 return (0); 1341 } 1342 1343 static struct sctp_tcb * 1344 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1345 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1346 struct sctp_inpcb *inp, struct sctp_nets **netp, 1347 struct sockaddr *init_src, int *notification, 1348 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1349 uint32_t vrf_id, uint16_t port); 1350 1351 1352 /* 1353 * handle a state cookie for an existing association m: input packet mbuf 1354 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1355 * "split" mbuf and the cookie signature does not exist offset: offset into 1356 * mbuf to the cookie-echo chunk 1357 */ 1358 static struct sctp_tcb * 1359 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1360 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1361 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1362 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1363 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1364 { 1365 struct sctp_association *asoc; 1366 struct sctp_init_chunk *init_cp, init_buf; 1367 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1368 struct sctp_nets *net; 1369 struct mbuf *op_err; 1370 struct sctp_paramhdr *ph; 1371 int chk_length; 1372 int init_offset, initack_offset, i; 1373 int retval; 1374 int spec_flag = 0; 1375 uint32_t how_indx; 1376 1377 net = *netp; 1378 /* I know that the TCB is non-NULL from the caller */ 1379 asoc = &stcb->asoc; 1380 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1381 if (asoc->cookie_how[how_indx] == 0) 1382 break; 1383 } 1384 if (how_indx < sizeof(asoc->cookie_how)) { 1385 asoc->cookie_how[how_indx] = 1; 1386 } 1387 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1388 /* SHUTDOWN came in after sending INIT-ACK */ 1389 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1390 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1391 0, M_DONTWAIT, 1, MT_DATA); 1392 if (op_err == NULL) { 1393 /* FOOBAR */ 1394 return (NULL); 1395 } 1396 /* Set the len */ 1397 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1398 ph = mtod(op_err, struct sctp_paramhdr *); 1399 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1400 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1401 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1402 vrf_id, net->port); 1403 if (how_indx < sizeof(asoc->cookie_how)) 1404 asoc->cookie_how[how_indx] = 2; 1405 return (NULL); 1406 } 1407 /* 1408 * find and validate the INIT chunk in the cookie (peer's info) the 1409 * INIT should start after the cookie-echo header struct (chunk 1410 * header, state cookie header struct) 1411 */ 1412 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1413 1414 init_cp = (struct sctp_init_chunk *) 1415 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1416 (uint8_t *) & init_buf); 1417 if (init_cp == NULL) { 1418 /* could not pull a INIT chunk in cookie */ 1419 return (NULL); 1420 } 1421 chk_length = ntohs(init_cp->ch.chunk_length); 1422 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1423 return (NULL); 1424 } 1425 /* 1426 * find and validate the INIT-ACK chunk in the cookie (my info) the 1427 * INIT-ACK follows the INIT chunk 1428 */ 1429 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1430 initack_cp = (struct sctp_init_ack_chunk *) 1431 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1432 (uint8_t *) & initack_buf); 1433 if (initack_cp == NULL) { 1434 /* could not pull INIT-ACK chunk in cookie */ 1435 return (NULL); 1436 } 1437 chk_length = ntohs(initack_cp->ch.chunk_length); 1438 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1439 return (NULL); 1440 } 1441 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1442 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1443 /* 1444 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1445 * to get into the OPEN state 1446 */ 1447 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1448 /*- 1449 * Opps, this means that we somehow generated two vtag's 1450 * the same. I.e. we did: 1451 * Us Peer 1452 * <---INIT(tag=a)------ 1453 * ----INIT-ACK(tag=t)--> 1454 * ----INIT(tag=t)------> *1 1455 * <---INIT-ACK(tag=a)--- 1456 * <----CE(tag=t)------------- *2 1457 * 1458 * At point *1 we should be generating a different 1459 * tag t'. Which means we would throw away the CE and send 1460 * ours instead. Basically this is case C (throw away side). 1461 */ 1462 if (how_indx < sizeof(asoc->cookie_how)) 1463 asoc->cookie_how[how_indx] = 17; 1464 return (NULL); 1465 1466 } 1467 switch SCTP_GET_STATE 1468 (asoc) { 1469 case SCTP_STATE_COOKIE_WAIT: 1470 case SCTP_STATE_COOKIE_ECHOED: 1471 /* 1472 * INIT was sent but got a COOKIE_ECHO with the 1473 * correct tags... just accept it...but we must 1474 * process the init so that we can make sure we have 1475 * the right seq no's. 1476 */ 1477 /* First we must process the INIT !! */ 1478 retval = sctp_process_init(init_cp, stcb, net); 1479 if (retval < 0) { 1480 if (how_indx < sizeof(asoc->cookie_how)) 1481 asoc->cookie_how[how_indx] = 3; 1482 return (NULL); 1483 } 1484 /* we have already processed the INIT so no problem */ 1485 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1486 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1487 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1488 /* update current state */ 1489 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1490 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1491 else 1492 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1493 1494 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1495 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1496 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1497 stcb->sctp_ep, stcb, asoc->primary_destination); 1498 } 1499 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1500 sctp_stop_all_cookie_timers(stcb); 1501 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1502 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1503 (inp->sctp_socket->so_qlimit == 0) 1504 ) { 1505 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1506 struct socket *so; 1507 1508 #endif 1509 /* 1510 * Here is where collision would go if we 1511 * did a connect() and instead got a 1512 * init/init-ack/cookie done before the 1513 * init-ack came back.. 1514 */ 1515 stcb->sctp_ep->sctp_flags |= 1516 SCTP_PCB_FLAGS_CONNECTED; 1517 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1518 so = SCTP_INP_SO(stcb->sctp_ep); 1519 atomic_add_int(&stcb->asoc.refcnt, 1); 1520 SCTP_TCB_UNLOCK(stcb); 1521 SCTP_SOCKET_LOCK(so, 1); 1522 SCTP_TCB_LOCK(stcb); 1523 atomic_add_int(&stcb->asoc.refcnt, -1); 1524 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1525 SCTP_SOCKET_UNLOCK(so, 1); 1526 return (NULL); 1527 } 1528 #endif 1529 soisconnected(stcb->sctp_socket); 1530 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1531 SCTP_SOCKET_UNLOCK(so, 1); 1532 #endif 1533 } 1534 /* notify upper layer */ 1535 *notification = SCTP_NOTIFY_ASSOC_UP; 1536 /* 1537 * since we did not send a HB make sure we don't 1538 * double things 1539 */ 1540 net->hb_responded = 1; 1541 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1542 &cookie->time_entered, sctp_align_unsafe_makecopy); 1543 1544 if (stcb->asoc.sctp_autoclose_ticks && 1545 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1546 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1547 inp, stcb, NULL); 1548 } 1549 break; 1550 default: 1551 /* 1552 * we're in the OPEN state (or beyond), so peer must 1553 * have simply lost the COOKIE-ACK 1554 */ 1555 break; 1556 } /* end switch */ 1557 sctp_stop_all_cookie_timers(stcb); 1558 /* 1559 * We ignore the return code here.. not sure if we should 1560 * somehow abort.. but we do have an existing asoc. This 1561 * really should not fail. 1562 */ 1563 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1564 init_offset + sizeof(struct sctp_init_chunk), 1565 initack_offset, sh, init_src)) { 1566 if (how_indx < sizeof(asoc->cookie_how)) 1567 asoc->cookie_how[how_indx] = 4; 1568 return (NULL); 1569 } 1570 /* respond with a COOKIE-ACK */ 1571 sctp_toss_old_cookies(stcb, asoc); 1572 sctp_send_cookie_ack(stcb); 1573 if (how_indx < sizeof(asoc->cookie_how)) 1574 asoc->cookie_how[how_indx] = 5; 1575 return (stcb); 1576 } 1577 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1578 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1579 cookie->tie_tag_my_vtag == 0 && 1580 cookie->tie_tag_peer_vtag == 0) { 1581 /* 1582 * case C in Section 5.2.4 Table 2: XMOO silently discard 1583 */ 1584 if (how_indx < sizeof(asoc->cookie_how)) 1585 asoc->cookie_how[how_indx] = 6; 1586 return (NULL); 1587 } 1588 /* 1589 * If nat support, and the below and stcb is established, send back 1590 * a ABORT(colliding state) if we are established. 1591 */ 1592 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1593 (asoc->peer_supports_nat) && 1594 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1595 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1596 (asoc->peer_vtag == 0)))) { 1597 /* 1598 * Special case - Peer's support nat. We may have two init's 1599 * that we gave out the same tag on since one was not 1600 * established.. i.e. we get INIT from host-1 behind the nat 1601 * and we respond tag-a, we get a INIT from host-2 behind 1602 * the nat and we get tag-a again. Then we bring up host-1 1603 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1604 * Now we have colliding state. We must send an abort here 1605 * with colliding state indication. 1606 */ 1607 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1608 0, M_DONTWAIT, 1, MT_DATA); 1609 if (op_err == NULL) { 1610 /* FOOBAR */ 1611 return (NULL); 1612 } 1613 /* pre-reserve some space */ 1614 #ifdef INET6 1615 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1616 #else 1617 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1618 #endif 1619 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1620 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1621 /* Set the len */ 1622 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1623 ph = mtod(op_err, struct sctp_paramhdr *); 1624 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1625 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1626 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1627 return (NULL); 1628 } 1629 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1630 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1631 (asoc->peer_vtag == 0))) { 1632 /* 1633 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1634 * should be ok, re-accept peer info 1635 */ 1636 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1637 /* 1638 * Extension of case C. If we hit this, then the 1639 * random number generator returned the same vtag 1640 * when we first sent our INIT-ACK and when we later 1641 * sent our INIT. The side with the seq numbers that 1642 * are different will be the one that normnally 1643 * would have hit case C. This in effect "extends" 1644 * our vtags in this collision case to be 64 bits. 1645 * The same collision could occur aka you get both 1646 * vtag and seq number the same twice in a row.. but 1647 * is much less likely. If it did happen then we 1648 * would proceed through and bring up the assoc.. we 1649 * may end up with the wrong stream setup however.. 1650 * which would be bad.. but there is no way to 1651 * tell.. until we send on a stream that does not 1652 * exist :-) 1653 */ 1654 if (how_indx < sizeof(asoc->cookie_how)) 1655 asoc->cookie_how[how_indx] = 7; 1656 1657 return (NULL); 1658 } 1659 if (how_indx < sizeof(asoc->cookie_how)) 1660 asoc->cookie_how[how_indx] = 8; 1661 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1662 sctp_stop_all_cookie_timers(stcb); 1663 /* 1664 * since we did not send a HB make sure we don't double 1665 * things 1666 */ 1667 net->hb_responded = 1; 1668 if (stcb->asoc.sctp_autoclose_ticks && 1669 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1670 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1671 NULL); 1672 } 1673 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1674 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1675 1676 /* Note last_cwr_tsn? where is this used? */ 1677 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1678 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1679 /* 1680 * Ok the peer probably discarded our data (if we 1681 * echoed a cookie+data). So anything on the 1682 * sent_queue should be marked for retransmit, we 1683 * may not get something to kick us so it COULD 1684 * still take a timeout to move these.. but it can't 1685 * hurt to mark them. 1686 */ 1687 struct sctp_tmit_chunk *chk; 1688 1689 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1690 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1691 chk->sent = SCTP_DATAGRAM_RESEND; 1692 sctp_flight_size_decrease(chk); 1693 sctp_total_flight_decrease(stcb, chk); 1694 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1695 spec_flag++; 1696 } 1697 } 1698 1699 } 1700 /* process the INIT info (peer's info) */ 1701 retval = sctp_process_init(init_cp, stcb, net); 1702 if (retval < 0) { 1703 if (how_indx < sizeof(asoc->cookie_how)) 1704 asoc->cookie_how[how_indx] = 9; 1705 return (NULL); 1706 } 1707 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1708 init_offset + sizeof(struct sctp_init_chunk), 1709 initack_offset, sh, init_src)) { 1710 if (how_indx < sizeof(asoc->cookie_how)) 1711 asoc->cookie_how[how_indx] = 10; 1712 return (NULL); 1713 } 1714 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1715 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1716 *notification = SCTP_NOTIFY_ASSOC_UP; 1717 1718 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1719 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1720 (inp->sctp_socket->so_qlimit == 0)) { 1721 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1722 struct socket *so; 1723 1724 #endif 1725 stcb->sctp_ep->sctp_flags |= 1726 SCTP_PCB_FLAGS_CONNECTED; 1727 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1728 so = SCTP_INP_SO(stcb->sctp_ep); 1729 atomic_add_int(&stcb->asoc.refcnt, 1); 1730 SCTP_TCB_UNLOCK(stcb); 1731 SCTP_SOCKET_LOCK(so, 1); 1732 SCTP_TCB_LOCK(stcb); 1733 atomic_add_int(&stcb->asoc.refcnt, -1); 1734 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1735 SCTP_SOCKET_UNLOCK(so, 1); 1736 return (NULL); 1737 } 1738 #endif 1739 soisconnected(stcb->sctp_socket); 1740 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1741 SCTP_SOCKET_UNLOCK(so, 1); 1742 #endif 1743 } 1744 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1745 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1746 else 1747 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1748 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1749 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1750 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1751 } else { 1752 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1753 } 1754 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1755 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1756 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1757 stcb->sctp_ep, stcb, asoc->primary_destination); 1758 } 1759 sctp_stop_all_cookie_timers(stcb); 1760 sctp_toss_old_cookies(stcb, asoc); 1761 sctp_send_cookie_ack(stcb); 1762 if (spec_flag) { 1763 /* 1764 * only if we have retrans set do we do this. What 1765 * this call does is get only the COOKIE-ACK out and 1766 * then when we return the normal call to 1767 * sctp_chunk_output will get the retrans out behind 1768 * this. 1769 */ 1770 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1771 } 1772 if (how_indx < sizeof(asoc->cookie_how)) 1773 asoc->cookie_how[how_indx] = 11; 1774 1775 return (stcb); 1776 } 1777 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1778 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1779 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1780 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1781 cookie->tie_tag_peer_vtag != 0) { 1782 struct sctpasochead *head; 1783 1784 if (asoc->peer_supports_nat) { 1785 /* 1786 * This is a gross gross hack. just call the 1787 * cookie_new code since we are allowing a duplicate 1788 * association. I hope this works... 1789 */ 1790 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1791 inp, netp, init_src, notification, 1792 auth_skipped, auth_offset, auth_len, 1793 vrf_id, port)); 1794 } 1795 /* 1796 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1797 */ 1798 /* temp code */ 1799 if (how_indx < sizeof(asoc->cookie_how)) 1800 asoc->cookie_how[how_indx] = 12; 1801 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1802 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1803 1804 *sac_assoc_id = sctp_get_associd(stcb); 1805 /* notify upper layer */ 1806 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1807 atomic_add_int(&stcb->asoc.refcnt, 1); 1808 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1809 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1810 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1811 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1812 } 1813 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1814 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1815 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1816 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1817 } 1818 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1819 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1820 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1821 stcb->sctp_ep, stcb, asoc->primary_destination); 1822 1823 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1824 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1825 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1826 } 1827 asoc->pre_open_streams = 1828 ntohs(initack_cp->init.num_outbound_streams); 1829 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1830 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1831 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1832 1833 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1834 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1835 1836 asoc->str_reset_seq_in = asoc->init_seq_number; 1837 1838 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1839 if (asoc->mapping_array) { 1840 memset(asoc->mapping_array, 0, 1841 asoc->mapping_array_size); 1842 } 1843 if (asoc->nr_mapping_array) { 1844 memset(asoc->nr_mapping_array, 0, 1845 asoc->mapping_array_size); 1846 } 1847 SCTP_TCB_UNLOCK(stcb); 1848 SCTP_INP_INFO_WLOCK(); 1849 SCTP_INP_WLOCK(stcb->sctp_ep); 1850 SCTP_TCB_LOCK(stcb); 1851 atomic_add_int(&stcb->asoc.refcnt, -1); 1852 /* send up all the data */ 1853 SCTP_TCB_SEND_LOCK(stcb); 1854 1855 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1856 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1857 stcb->asoc.strmout[i].stream_no = i; 1858 stcb->asoc.strmout[i].next_sequence_sent = 0; 1859 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1860 } 1861 /* process the INIT-ACK info (my info) */ 1862 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1863 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1864 1865 /* pull from vtag hash */ 1866 LIST_REMOVE(stcb, sctp_asocs); 1867 /* re-insert to new vtag position */ 1868 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1869 SCTP_BASE_INFO(hashasocmark))]; 1870 /* 1871 * put it in the bucket in the vtag hash of assoc's for the 1872 * system 1873 */ 1874 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1875 1876 /* process the INIT info (peer's info) */ 1877 SCTP_TCB_SEND_UNLOCK(stcb); 1878 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1879 SCTP_INP_INFO_WUNLOCK(); 1880 1881 retval = sctp_process_init(init_cp, stcb, net); 1882 if (retval < 0) { 1883 if (how_indx < sizeof(asoc->cookie_how)) 1884 asoc->cookie_how[how_indx] = 13; 1885 1886 return (NULL); 1887 } 1888 /* 1889 * since we did not send a HB make sure we don't double 1890 * things 1891 */ 1892 net->hb_responded = 1; 1893 1894 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1895 init_offset + sizeof(struct sctp_init_chunk), 1896 initack_offset, sh, init_src)) { 1897 if (how_indx < sizeof(asoc->cookie_how)) 1898 asoc->cookie_how[how_indx] = 14; 1899 1900 return (NULL); 1901 } 1902 /* respond with a COOKIE-ACK */ 1903 sctp_stop_all_cookie_timers(stcb); 1904 sctp_toss_old_cookies(stcb, asoc); 1905 sctp_send_cookie_ack(stcb); 1906 if (how_indx < sizeof(asoc->cookie_how)) 1907 asoc->cookie_how[how_indx] = 15; 1908 1909 return (stcb); 1910 } 1911 if (how_indx < sizeof(asoc->cookie_how)) 1912 asoc->cookie_how[how_indx] = 16; 1913 /* all other cases... */ 1914 return (NULL); 1915 } 1916 1917 1918 /* 1919 * handle a state cookie for a new association m: input packet mbuf chain-- 1920 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1921 * and the cookie signature does not exist offset: offset into mbuf to the 1922 * cookie-echo chunk length: length of the cookie chunk to: where the init 1923 * was from returns a new TCB 1924 */ 1925 struct sctp_tcb * 1926 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1927 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1928 struct sctp_inpcb *inp, struct sctp_nets **netp, 1929 struct sockaddr *init_src, int *notification, 1930 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1931 uint32_t vrf_id, uint16_t port) 1932 { 1933 struct sctp_tcb *stcb; 1934 struct sctp_init_chunk *init_cp, init_buf; 1935 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1936 struct sockaddr_storage sa_store; 1937 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1938 struct sockaddr_in *sin; 1939 struct sockaddr_in6 *sin6; 1940 struct sctp_association *asoc; 1941 int chk_length; 1942 int init_offset, initack_offset, initack_limit; 1943 int retval; 1944 int error = 0; 1945 uint32_t old_tag; 1946 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1947 1948 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1949 struct socket *so; 1950 1951 so = SCTP_INP_SO(inp); 1952 #endif 1953 1954 /* 1955 * find and validate the INIT chunk in the cookie (peer's info) the 1956 * INIT should start after the cookie-echo header struct (chunk 1957 * header, state cookie header struct) 1958 */ 1959 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1960 init_cp = (struct sctp_init_chunk *) 1961 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1962 (uint8_t *) & init_buf); 1963 if (init_cp == NULL) { 1964 /* could not pull a INIT chunk in cookie */ 1965 SCTPDBG(SCTP_DEBUG_INPUT1, 1966 "process_cookie_new: could not pull INIT chunk hdr\n"); 1967 return (NULL); 1968 } 1969 chk_length = ntohs(init_cp->ch.chunk_length); 1970 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1971 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1972 return (NULL); 1973 } 1974 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1975 /* 1976 * find and validate the INIT-ACK chunk in the cookie (my info) the 1977 * INIT-ACK follows the INIT chunk 1978 */ 1979 initack_cp = (struct sctp_init_ack_chunk *) 1980 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1981 (uint8_t *) & initack_buf); 1982 if (initack_cp == NULL) { 1983 /* could not pull INIT-ACK chunk in cookie */ 1984 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1985 return (NULL); 1986 } 1987 chk_length = ntohs(initack_cp->ch.chunk_length); 1988 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1989 return (NULL); 1990 } 1991 /* 1992 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1993 * "initack_limit" value. This is because the chk_length field 1994 * includes the length of the cookie, but the cookie is omitted when 1995 * the INIT and INIT_ACK are tacked onto the cookie... 1996 */ 1997 initack_limit = offset + cookie_len; 1998 1999 /* 2000 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2001 * and popluate 2002 */ 2003 2004 /* 2005 * Here we do a trick, we set in NULL for the proc/thread argument. 2006 * We do this since in effect we only use the p argument when the 2007 * socket is unbound and we must do an implicit bind. Since we are 2008 * getting a cookie, we cannot be unbound. 2009 */ 2010 stcb = sctp_aloc_assoc(inp, init_src, &error, 2011 ntohl(initack_cp->init.initiate_tag), vrf_id, 2012 (struct thread *)NULL 2013 ); 2014 if (stcb == NULL) { 2015 struct mbuf *op_err; 2016 2017 /* memory problem? */ 2018 SCTPDBG(SCTP_DEBUG_INPUT1, 2019 "process_cookie_new: no room for another TCB!\n"); 2020 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2021 2022 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2023 sh, op_err, vrf_id, port); 2024 return (NULL); 2025 } 2026 /* get the correct sctp_nets */ 2027 if (netp) 2028 *netp = sctp_findnet(stcb, init_src); 2029 2030 asoc = &stcb->asoc; 2031 /* get scope variables out of cookie */ 2032 asoc->ipv4_local_scope = cookie->ipv4_scope; 2033 asoc->site_scope = cookie->site_scope; 2034 asoc->local_scope = cookie->local_scope; 2035 asoc->loopback_scope = cookie->loopback_scope; 2036 2037 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2038 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2039 struct mbuf *op_err; 2040 2041 /* 2042 * Houston we have a problem. The EP changed while the 2043 * cookie was in flight. Only recourse is to abort the 2044 * association. 2045 */ 2046 atomic_add_int(&stcb->asoc.refcnt, 1); 2047 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2048 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2049 sh, op_err, vrf_id, port); 2050 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2051 SCTP_TCB_UNLOCK(stcb); 2052 SCTP_SOCKET_LOCK(so, 1); 2053 SCTP_TCB_LOCK(stcb); 2054 #endif 2055 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2057 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2058 SCTP_SOCKET_UNLOCK(so, 1); 2059 #endif 2060 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2061 return (NULL); 2062 } 2063 /* process the INIT-ACK info (my info) */ 2064 old_tag = asoc->my_vtag; 2065 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2066 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2067 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2068 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2069 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2070 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2071 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2072 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2073 asoc->str_reset_seq_in = asoc->init_seq_number; 2074 2075 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2076 2077 /* process the INIT info (peer's info) */ 2078 if (netp) 2079 retval = sctp_process_init(init_cp, stcb, *netp); 2080 else 2081 retval = 0; 2082 if (retval < 0) { 2083 atomic_add_int(&stcb->asoc.refcnt, 1); 2084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2085 SCTP_TCB_UNLOCK(stcb); 2086 SCTP_SOCKET_LOCK(so, 1); 2087 SCTP_TCB_LOCK(stcb); 2088 #endif 2089 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2090 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2091 SCTP_SOCKET_UNLOCK(so, 1); 2092 #endif 2093 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2094 return (NULL); 2095 } 2096 /* load all addresses */ 2097 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2098 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2099 init_src)) { 2100 atomic_add_int(&stcb->asoc.refcnt, 1); 2101 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2102 SCTP_TCB_UNLOCK(stcb); 2103 SCTP_SOCKET_LOCK(so, 1); 2104 SCTP_TCB_LOCK(stcb); 2105 #endif 2106 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2108 SCTP_SOCKET_UNLOCK(so, 1); 2109 #endif 2110 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2111 return (NULL); 2112 } 2113 /* 2114 * verify any preceding AUTH chunk that was skipped 2115 */ 2116 /* pull the local authentication parameters from the cookie/init-ack */ 2117 sctp_auth_get_cookie_params(stcb, m, 2118 initack_offset + sizeof(struct sctp_init_ack_chunk), 2119 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2120 if (auth_skipped) { 2121 struct sctp_auth_chunk *auth; 2122 2123 auth = (struct sctp_auth_chunk *) 2124 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2125 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2126 /* auth HMAC failed, dump the assoc and packet */ 2127 SCTPDBG(SCTP_DEBUG_AUTH1, 2128 "COOKIE-ECHO: AUTH failed\n"); 2129 atomic_add_int(&stcb->asoc.refcnt, 1); 2130 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2131 SCTP_TCB_UNLOCK(stcb); 2132 SCTP_SOCKET_LOCK(so, 1); 2133 SCTP_TCB_LOCK(stcb); 2134 #endif 2135 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2136 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2137 SCTP_SOCKET_UNLOCK(so, 1); 2138 #endif 2139 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2140 return (NULL); 2141 } else { 2142 /* remaining chunks checked... good to go */ 2143 stcb->asoc.authenticated = 1; 2144 } 2145 } 2146 /* update current state */ 2147 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2148 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2149 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2150 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2151 stcb->sctp_ep, stcb, asoc->primary_destination); 2152 } 2153 sctp_stop_all_cookie_timers(stcb); 2154 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2155 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2156 2157 /* 2158 * if we're doing ASCONFs, check to see if we have any new local 2159 * addresses that need to get added to the peer (eg. addresses 2160 * changed while cookie echo in flight). This needs to be done 2161 * after we go to the OPEN state to do the correct asconf 2162 * processing. else, make sure we have the correct addresses in our 2163 * lists 2164 */ 2165 2166 /* warning, we re-use sin, sin6, sa_store here! */ 2167 /* pull in local_address (our "from" address) */ 2168 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2169 /* source addr is IPv4 */ 2170 sin = (struct sockaddr_in *)initack_src; 2171 memset(sin, 0, sizeof(*sin)); 2172 sin->sin_family = AF_INET; 2173 sin->sin_len = sizeof(struct sockaddr_in); 2174 sin->sin_addr.s_addr = cookie->laddress[0]; 2175 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2176 /* source addr is IPv6 */ 2177 sin6 = (struct sockaddr_in6 *)initack_src; 2178 memset(sin6, 0, sizeof(*sin6)); 2179 sin6->sin6_family = AF_INET6; 2180 sin6->sin6_len = sizeof(struct sockaddr_in6); 2181 sin6->sin6_scope_id = cookie->scope_id; 2182 memcpy(&sin6->sin6_addr, cookie->laddress, 2183 sizeof(sin6->sin6_addr)); 2184 } else { 2185 atomic_add_int(&stcb->asoc.refcnt, 1); 2186 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_TCB_UNLOCK(stcb); 2188 SCTP_SOCKET_LOCK(so, 1); 2189 SCTP_TCB_LOCK(stcb); 2190 #endif 2191 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2192 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2193 SCTP_SOCKET_UNLOCK(so, 1); 2194 #endif 2195 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2196 return (NULL); 2197 } 2198 2199 /* set up to notify upper layer */ 2200 *notification = SCTP_NOTIFY_ASSOC_UP; 2201 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2202 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2203 (inp->sctp_socket->so_qlimit == 0)) { 2204 /* 2205 * This is an endpoint that called connect() how it got a 2206 * cookie that is NEW is a bit of a mystery. It must be that 2207 * the INIT was sent, but before it got there.. a complete 2208 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2209 * should have went to the other code.. not here.. oh well.. 2210 * a bit of protection is worth having.. 2211 */ 2212 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2213 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2214 atomic_add_int(&stcb->asoc.refcnt, 1); 2215 SCTP_TCB_UNLOCK(stcb); 2216 SCTP_SOCKET_LOCK(so, 1); 2217 SCTP_TCB_LOCK(stcb); 2218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2219 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2220 SCTP_SOCKET_UNLOCK(so, 1); 2221 return (NULL); 2222 } 2223 #endif 2224 soisconnected(stcb->sctp_socket); 2225 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2226 SCTP_SOCKET_UNLOCK(so, 1); 2227 #endif 2228 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2229 (inp->sctp_socket->so_qlimit)) { 2230 /* 2231 * We don't want to do anything with this one. Since it is 2232 * the listening guy. The timer will get started for 2233 * accepted connections in the caller. 2234 */ 2235 ; 2236 } 2237 /* since we did not send a HB make sure we don't double things */ 2238 if ((netp) && (*netp)) 2239 (*netp)->hb_responded = 1; 2240 2241 if (stcb->asoc.sctp_autoclose_ticks && 2242 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2243 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2244 } 2245 /* calculate the RTT */ 2246 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2247 if ((netp) && (*netp)) { 2248 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2249 &cookie->time_entered, sctp_align_unsafe_makecopy); 2250 } 2251 /* respond with a COOKIE-ACK */ 2252 sctp_send_cookie_ack(stcb); 2253 2254 /* 2255 * check the address lists for any ASCONFs that need to be sent 2256 * AFTER the cookie-ack is sent 2257 */ 2258 sctp_check_address_list(stcb, m, 2259 initack_offset + sizeof(struct sctp_init_ack_chunk), 2260 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2261 initack_src, cookie->local_scope, cookie->site_scope, 2262 cookie->ipv4_scope, cookie->loopback_scope); 2263 2264 2265 return (stcb); 2266 } 2267 2268 /* 2269 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2270 * we NEED to make sure we are not already using the vtag. If so we 2271 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2272 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2273 SCTP_BASE_INFO(hashasocmark))]; 2274 LIST_FOREACH(stcb, head, sctp_asocs) { 2275 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2276 -- SEND ABORT - TRY AGAIN -- 2277 } 2278 } 2279 */ 2280 2281 /* 2282 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2283 * existing (non-NULL) TCB 2284 */ 2285 static struct mbuf * 2286 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2287 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2288 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2289 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2290 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2291 { 2292 struct sctp_state_cookie *cookie; 2293 struct sockaddr_in6 sin6; 2294 struct sockaddr_in sin; 2295 struct sctp_tcb *l_stcb = *stcb; 2296 struct sctp_inpcb *l_inp; 2297 struct sockaddr *to; 2298 sctp_assoc_t sac_restart_id; 2299 struct sctp_pcb *ep; 2300 struct mbuf *m_sig; 2301 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2302 uint8_t *sig; 2303 uint8_t cookie_ok = 0; 2304 unsigned int size_of_pkt, sig_offset, cookie_offset; 2305 unsigned int cookie_len; 2306 struct timeval now; 2307 struct timeval time_expires; 2308 struct sockaddr_storage dest_store; 2309 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2310 struct ip *iph; 2311 int notification = 0; 2312 struct sctp_nets *netl; 2313 int had_a_existing_tcb = 0; 2314 int send_int_conf = 0; 2315 2316 SCTPDBG(SCTP_DEBUG_INPUT2, 2317 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2318 2319 if (inp_p == NULL) { 2320 return (NULL); 2321 } 2322 /* First get the destination address setup too. */ 2323 iph = mtod(m, struct ip *); 2324 switch (iph->ip_v) { 2325 case IPVERSION: 2326 { 2327 /* its IPv4 */ 2328 struct sockaddr_in *lsin; 2329 2330 lsin = (struct sockaddr_in *)(localep_sa); 2331 memset(lsin, 0, sizeof(*lsin)); 2332 lsin->sin_family = AF_INET; 2333 lsin->sin_len = sizeof(*lsin); 2334 lsin->sin_port = sh->dest_port; 2335 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2336 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2337 break; 2338 } 2339 #ifdef INET6 2340 case IPV6_VERSION >> 4: 2341 { 2342 /* its IPv6 */ 2343 struct ip6_hdr *ip6; 2344 struct sockaddr_in6 *lsin6; 2345 2346 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2347 memset(lsin6, 0, sizeof(*lsin6)); 2348 lsin6->sin6_family = AF_INET6; 2349 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2350 ip6 = mtod(m, struct ip6_hdr *); 2351 lsin6->sin6_port = sh->dest_port; 2352 lsin6->sin6_addr = ip6->ip6_dst; 2353 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2354 break; 2355 } 2356 #endif 2357 default: 2358 return (NULL); 2359 } 2360 2361 cookie = &cp->cookie; 2362 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2363 cookie_len = ntohs(cp->ch.chunk_length); 2364 2365 if ((cookie->peerport != sh->src_port) && 2366 (cookie->myport != sh->dest_port) && 2367 (cookie->my_vtag != sh->v_tag)) { 2368 /* 2369 * invalid ports or bad tag. Note that we always leave the 2370 * v_tag in the header in network order and when we stored 2371 * it in the my_vtag slot we also left it in network order. 2372 * This maintains the match even though it may be in the 2373 * opposite byte order of the machine :-> 2374 */ 2375 return (NULL); 2376 } 2377 if (cookie_len > size_of_pkt || 2378 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2379 sizeof(struct sctp_init_chunk) + 2380 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2381 /* cookie too long! or too small */ 2382 return (NULL); 2383 } 2384 /* 2385 * split off the signature into its own mbuf (since it should not be 2386 * calculated in the sctp_hmac_m() call). 2387 */ 2388 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2389 if (sig_offset > size_of_pkt) { 2390 /* packet not correct size! */ 2391 /* XXX this may already be accounted for earlier... */ 2392 return (NULL); 2393 } 2394 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2395 if (m_sig == NULL) { 2396 /* out of memory or ?? */ 2397 return (NULL); 2398 } 2399 #ifdef SCTP_MBUF_LOGGING 2400 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2401 struct mbuf *mat; 2402 2403 mat = m_sig; 2404 while (mat) { 2405 if (SCTP_BUF_IS_EXTENDED(mat)) { 2406 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2407 } 2408 mat = SCTP_BUF_NEXT(mat); 2409 } 2410 } 2411 #endif 2412 2413 /* 2414 * compute the signature/digest for the cookie 2415 */ 2416 ep = &(*inp_p)->sctp_ep; 2417 l_inp = *inp_p; 2418 if (l_stcb) { 2419 SCTP_TCB_UNLOCK(l_stcb); 2420 } 2421 SCTP_INP_RLOCK(l_inp); 2422 if (l_stcb) { 2423 SCTP_TCB_LOCK(l_stcb); 2424 } 2425 /* which cookie is it? */ 2426 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2427 (ep->current_secret_number != ep->last_secret_number)) { 2428 /* it's the old cookie */ 2429 (void)sctp_hmac_m(SCTP_HMAC, 2430 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2431 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2432 } else { 2433 /* it's the current cookie */ 2434 (void)sctp_hmac_m(SCTP_HMAC, 2435 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2436 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2437 } 2438 /* get the signature */ 2439 SCTP_INP_RUNLOCK(l_inp); 2440 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2441 if (sig == NULL) { 2442 /* couldn't find signature */ 2443 sctp_m_freem(m_sig); 2444 return (NULL); 2445 } 2446 /* compare the received digest with the computed digest */ 2447 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2448 /* try the old cookie? */ 2449 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2450 (ep->current_secret_number != ep->last_secret_number)) { 2451 /* compute digest with old */ 2452 (void)sctp_hmac_m(SCTP_HMAC, 2453 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2454 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2455 /* compare */ 2456 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2457 cookie_ok = 1; 2458 } 2459 } else { 2460 cookie_ok = 1; 2461 } 2462 2463 /* 2464 * Now before we continue we must reconstruct our mbuf so that 2465 * normal processing of any other chunks will work. 2466 */ 2467 { 2468 struct mbuf *m_at; 2469 2470 m_at = m; 2471 while (SCTP_BUF_NEXT(m_at) != NULL) { 2472 m_at = SCTP_BUF_NEXT(m_at); 2473 } 2474 SCTP_BUF_NEXT(m_at) = m_sig; 2475 } 2476 2477 if (cookie_ok == 0) { 2478 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2479 SCTPDBG(SCTP_DEBUG_INPUT2, 2480 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2481 (uint32_t) offset, cookie_offset, sig_offset); 2482 return (NULL); 2483 } 2484 /* 2485 * check the cookie timestamps to be sure it's not stale 2486 */ 2487 (void)SCTP_GETTIME_TIMEVAL(&now); 2488 /* Expire time is in Ticks, so we convert to seconds */ 2489 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2490 time_expires.tv_usec = cookie->time_entered.tv_usec; 2491 /* 2492 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2493 * is undefined. 2494 */ 2495 if (timevalcmp(&now, &time_expires, >)) { 2496 /* cookie is stale! */ 2497 struct mbuf *op_err; 2498 struct sctp_stale_cookie_msg *scm; 2499 uint32_t tim; 2500 2501 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2502 0, M_DONTWAIT, 1, MT_DATA); 2503 if (op_err == NULL) { 2504 /* FOOBAR */ 2505 return (NULL); 2506 } 2507 /* Set the len */ 2508 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2509 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2510 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2511 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2512 (sizeof(uint32_t)))); 2513 /* seconds to usec */ 2514 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2515 /* add in usec */ 2516 if (tim == 0) 2517 tim = now.tv_usec - cookie->time_entered.tv_usec; 2518 scm->time_usec = htonl(tim); 2519 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2520 vrf_id, port); 2521 return (NULL); 2522 } 2523 /* 2524 * Now we must see with the lookup address if we have an existing 2525 * asoc. This will only happen if we were in the COOKIE-WAIT state 2526 * and a INIT collided with us and somewhere the peer sent the 2527 * cookie on another address besides the single address our assoc 2528 * had for him. In this case we will have one of the tie-tags set at 2529 * least AND the address field in the cookie can be used to look it 2530 * up. 2531 */ 2532 to = NULL; 2533 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2534 memset(&sin6, 0, sizeof(sin6)); 2535 sin6.sin6_family = AF_INET6; 2536 sin6.sin6_len = sizeof(sin6); 2537 sin6.sin6_port = sh->src_port; 2538 sin6.sin6_scope_id = cookie->scope_id; 2539 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2540 sizeof(sin6.sin6_addr.s6_addr)); 2541 to = (struct sockaddr *)&sin6; 2542 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2543 memset(&sin, 0, sizeof(sin)); 2544 sin.sin_family = AF_INET; 2545 sin.sin_len = sizeof(sin); 2546 sin.sin_port = sh->src_port; 2547 sin.sin_addr.s_addr = cookie->address[0]; 2548 to = (struct sockaddr *)&sin; 2549 } else { 2550 /* This should not happen */ 2551 return (NULL); 2552 } 2553 if ((*stcb == NULL) && to) { 2554 /* Yep, lets check */ 2555 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2556 if (*stcb == NULL) { 2557 /* 2558 * We should have only got back the same inp. If we 2559 * got back a different ep we have a problem. The 2560 * original findep got back l_inp and now 2561 */ 2562 if (l_inp != *inp_p) { 2563 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2564 } 2565 } else { 2566 if (*locked_tcb == NULL) { 2567 /* 2568 * In this case we found the assoc only 2569 * after we locked the create lock. This 2570 * means we are in a colliding case and we 2571 * must make sure that we unlock the tcb if 2572 * its one of the cases where we throw away 2573 * the incoming packets. 2574 */ 2575 *locked_tcb = *stcb; 2576 2577 /* 2578 * We must also increment the inp ref count 2579 * since the ref_count flags was set when we 2580 * did not find the TCB, now we found it 2581 * which reduces the refcount.. we must 2582 * raise it back out to balance it all :-) 2583 */ 2584 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2585 if ((*stcb)->sctp_ep != l_inp) { 2586 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2587 (*stcb)->sctp_ep, l_inp); 2588 } 2589 } 2590 } 2591 } 2592 if (to == NULL) { 2593 return (NULL); 2594 } 2595 cookie_len -= SCTP_SIGNATURE_SIZE; 2596 if (*stcb == NULL) { 2597 /* this is the "normal" case... get a new TCB */ 2598 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2599 cookie_len, *inp_p, netp, to, ¬ification, 2600 auth_skipped, auth_offset, auth_len, vrf_id, port); 2601 } else { 2602 /* this is abnormal... cookie-echo on existing TCB */ 2603 had_a_existing_tcb = 1; 2604 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2605 cookie, cookie_len, *inp_p, *stcb, netp, to, 2606 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2607 } 2608 2609 if (*stcb == NULL) { 2610 /* still no TCB... must be bad cookie-echo */ 2611 return (NULL); 2612 } 2613 /* 2614 * Ok, we built an association so confirm the address we sent the 2615 * INIT-ACK to. 2616 */ 2617 netl = sctp_findnet(*stcb, to); 2618 /* 2619 * This code should in theory NOT run but 2620 */ 2621 if (netl == NULL) { 2622 /* TSNH! Huh, why do I need to add this address here? */ 2623 int ret; 2624 2625 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2626 SCTP_IN_COOKIE_PROC); 2627 netl = sctp_findnet(*stcb, to); 2628 } 2629 if (netl) { 2630 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2631 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2632 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2633 netl); 2634 send_int_conf = 1; 2635 } 2636 } 2637 if (*stcb) { 2638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2639 *stcb, NULL); 2640 } 2641 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2642 if (!had_a_existing_tcb || 2643 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2644 /* 2645 * If we have a NEW cookie or the connect never 2646 * reached the connected state during collision we 2647 * must do the TCP accept thing. 2648 */ 2649 struct socket *so, *oso; 2650 struct sctp_inpcb *inp; 2651 2652 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2653 /* 2654 * For a restart we will keep the same 2655 * socket, no need to do anything. I THINK!! 2656 */ 2657 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2658 if (send_int_conf) { 2659 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2660 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2661 } 2662 return (m); 2663 } 2664 oso = (*inp_p)->sctp_socket; 2665 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2666 SCTP_TCB_UNLOCK((*stcb)); 2667 so = sonewconn(oso, 0 2668 ); 2669 SCTP_TCB_LOCK((*stcb)); 2670 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2671 2672 if (so == NULL) { 2673 struct mbuf *op_err; 2674 2675 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2676 struct socket *pcb_so; 2677 2678 #endif 2679 /* Too many sockets */ 2680 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2681 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2682 sctp_abort_association(*inp_p, NULL, m, iphlen, 2683 sh, op_err, vrf_id, port); 2684 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2685 pcb_so = SCTP_INP_SO(*inp_p); 2686 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2687 SCTP_TCB_UNLOCK((*stcb)); 2688 SCTP_SOCKET_LOCK(pcb_so, 1); 2689 SCTP_TCB_LOCK((*stcb)); 2690 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2691 #endif 2692 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2693 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2694 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2695 #endif 2696 return (NULL); 2697 } 2698 inp = (struct sctp_inpcb *)so->so_pcb; 2699 SCTP_INP_INCR_REF(inp); 2700 /* 2701 * We add the unbound flag here so that if we get an 2702 * soabort() before we get the move_pcb done, we 2703 * will properly cleanup. 2704 */ 2705 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2706 SCTP_PCB_FLAGS_CONNECTED | 2707 SCTP_PCB_FLAGS_IN_TCPPOOL | 2708 SCTP_PCB_FLAGS_UNBOUND | 2709 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2710 SCTP_PCB_FLAGS_DONT_WAKE); 2711 inp->sctp_features = (*inp_p)->sctp_features; 2712 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2713 inp->sctp_socket = so; 2714 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2715 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2716 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2717 inp->sctp_context = (*inp_p)->sctp_context; 2718 inp->inp_starting_point_for_iterator = NULL; 2719 /* 2720 * copy in the authentication parameters from the 2721 * original endpoint 2722 */ 2723 if (inp->sctp_ep.local_hmacs) 2724 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2725 inp->sctp_ep.local_hmacs = 2726 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2727 if (inp->sctp_ep.local_auth_chunks) 2728 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2729 inp->sctp_ep.local_auth_chunks = 2730 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2731 2732 /* 2733 * Now we must move it from one hash table to 2734 * another and get the tcb in the right place. 2735 */ 2736 2737 /* 2738 * This is where the one-2-one socket is put into 2739 * the accept state waiting for the accept! 2740 */ 2741 if (*stcb) { 2742 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2743 } 2744 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2745 2746 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2747 SCTP_TCB_UNLOCK((*stcb)); 2748 2749 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2750 0); 2751 SCTP_TCB_LOCK((*stcb)); 2752 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2753 2754 2755 /* 2756 * now we must check to see if we were aborted while 2757 * the move was going on and the lock/unlock 2758 * happened. 2759 */ 2760 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2761 /* 2762 * yep it was, we leave the assoc attached 2763 * to the socket since the sctp_inpcb_free() 2764 * call will send an abort for us. 2765 */ 2766 SCTP_INP_DECR_REF(inp); 2767 return (NULL); 2768 } 2769 SCTP_INP_DECR_REF(inp); 2770 /* Switch over to the new guy */ 2771 *inp_p = inp; 2772 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2773 if (send_int_conf) { 2774 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2775 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2776 } 2777 /* 2778 * Pull it from the incomplete queue and wake the 2779 * guy 2780 */ 2781 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2782 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2783 SCTP_TCB_UNLOCK((*stcb)); 2784 SCTP_SOCKET_LOCK(so, 1); 2785 #endif 2786 soisconnected(so); 2787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2788 SCTP_TCB_LOCK((*stcb)); 2789 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2790 SCTP_SOCKET_UNLOCK(so, 1); 2791 #endif 2792 return (m); 2793 } 2794 } 2795 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2796 if (notification) { 2797 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2798 } 2799 if (send_int_conf) { 2800 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2801 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2802 } 2803 } 2804 return (m); 2805 } 2806 2807 static void 2808 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2809 struct sctp_tcb *stcb, struct sctp_nets *net) 2810 { 2811 /* cp must not be used, others call this without a c-ack :-) */ 2812 struct sctp_association *asoc; 2813 2814 SCTPDBG(SCTP_DEBUG_INPUT2, 2815 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2816 if (stcb == NULL) 2817 return; 2818 2819 asoc = &stcb->asoc; 2820 2821 sctp_stop_all_cookie_timers(stcb); 2822 /* process according to association state */ 2823 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2824 /* state change only needed when I am in right state */ 2825 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2826 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2827 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2828 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2829 stcb->sctp_ep, stcb, asoc->primary_destination); 2830 2831 } 2832 /* update RTO */ 2833 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2834 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2835 if (asoc->overall_error_count == 0) { 2836 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2837 &asoc->time_entered, sctp_align_safe_nocopy); 2838 } 2839 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2840 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2841 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2842 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2843 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2844 struct socket *so; 2845 2846 #endif 2847 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2848 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2849 so = SCTP_INP_SO(stcb->sctp_ep); 2850 atomic_add_int(&stcb->asoc.refcnt, 1); 2851 SCTP_TCB_UNLOCK(stcb); 2852 SCTP_SOCKET_LOCK(so, 1); 2853 SCTP_TCB_LOCK(stcb); 2854 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2855 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2856 SCTP_SOCKET_UNLOCK(so, 1); 2857 return; 2858 } 2859 #endif 2860 soisconnected(stcb->sctp_socket); 2861 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2862 SCTP_SOCKET_UNLOCK(so, 1); 2863 #endif 2864 } 2865 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2866 stcb, net); 2867 /* 2868 * since we did not send a HB make sure we don't double 2869 * things 2870 */ 2871 net->hb_responded = 1; 2872 2873 if (stcb->asoc.sctp_autoclose_ticks && 2874 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2875 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2876 stcb->sctp_ep, stcb, NULL); 2877 } 2878 /* 2879 * send ASCONF if parameters are pending and ASCONFs are 2880 * allowed (eg. addresses changed when init/cookie echo were 2881 * in flight) 2882 */ 2883 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2884 (stcb->asoc.peer_supports_asconf) && 2885 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2886 #ifdef SCTP_TIMER_BASED_ASCONF 2887 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2888 stcb->sctp_ep, stcb, 2889 stcb->asoc.primary_destination); 2890 #else 2891 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2892 SCTP_ADDR_NOT_LOCKED); 2893 #endif 2894 } 2895 } 2896 /* Toss the cookie if I can */ 2897 sctp_toss_old_cookies(stcb, asoc); 2898 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2899 /* Restart the timer if we have pending data */ 2900 struct sctp_tmit_chunk *chk; 2901 2902 chk = TAILQ_FIRST(&asoc->sent_queue); 2903 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2904 } 2905 } 2906 2907 static void 2908 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2909 struct sctp_tcb *stcb) 2910 { 2911 struct sctp_nets *net; 2912 struct sctp_tmit_chunk *lchk; 2913 uint32_t tsn; 2914 2915 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2916 return; 2917 } 2918 SCTP_STAT_INCR(sctps_recvecne); 2919 tsn = ntohl(cp->tsn); 2920 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2921 /* Also we make sure we disable the nonce_wait */ 2922 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2923 if (lchk == NULL) { 2924 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2925 } else { 2926 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2927 } 2928 stcb->asoc.nonce_wait_for_ecne = 0; 2929 stcb->asoc.nonce_sum_check = 0; 2930 2931 /* Find where it was sent, if possible */ 2932 net = NULL; 2933 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2934 if (lchk->rec.data.TSN_seq == tsn) { 2935 net = lchk->whoTo; 2936 break; 2937 } 2938 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 2939 break; 2940 } 2941 } 2942 if (net == NULL) 2943 /* default is we use the primary */ 2944 net = stcb->asoc.primary_destination; 2945 2946 if (SCTP_TSN_GT(tsn, stcb->asoc.last_cwr_tsn)) { 2947 /* 2948 * JRS - Use the congestion control given in the pluggable 2949 * CC module 2950 */ 2951 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2952 /* 2953 * we reduce once every RTT. So we will only lower cwnd at 2954 * the next sending seq i.e. the resync_tsn. 2955 */ 2956 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2957 } 2958 /* 2959 * We always send a CWR this way if our previous one was lost our 2960 * peer will get an update, or if it is not time again to reduce we 2961 * still get the cwr to the peer. 2962 */ 2963 sctp_send_cwr(stcb, net, tsn); 2964 } 2965 2966 static void 2967 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2968 { 2969 /* 2970 * Here we get a CWR from the peer. We must look in the outqueue and 2971 * make sure that we have a covered ECNE in teh control chunk part. 2972 * If so remove it. 2973 */ 2974 struct sctp_tmit_chunk *chk; 2975 struct sctp_ecne_chunk *ecne; 2976 2977 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2978 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2979 continue; 2980 } 2981 /* 2982 * Look for and remove if it is the right TSN. Since there 2983 * is only ONE ECNE on the control queue at any one time we 2984 * don't need to worry about more than one! 2985 */ 2986 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2987 if (SCTP_TSN_GE(ntohl(cp->tsn), ntohl(ecne->tsn))) { 2988 /* this covers this ECNE, we can remove it */ 2989 stcb->asoc.ecn_echo_cnt_onq--; 2990 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2991 sctp_next); 2992 if (chk->data) { 2993 sctp_m_freem(chk->data); 2994 chk->data = NULL; 2995 } 2996 stcb->asoc.ctrl_queue_cnt--; 2997 sctp_free_a_chunk(stcb, chk); 2998 break; 2999 } 3000 } 3001 } 3002 3003 static void 3004 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3005 struct sctp_tcb *stcb, struct sctp_nets *net) 3006 { 3007 struct sctp_association *asoc; 3008 3009 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3010 struct socket *so; 3011 3012 #endif 3013 3014 SCTPDBG(SCTP_DEBUG_INPUT2, 3015 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3016 if (stcb == NULL) 3017 return; 3018 3019 asoc = &stcb->asoc; 3020 /* process according to association state */ 3021 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3022 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3023 SCTPDBG(SCTP_DEBUG_INPUT2, 3024 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3025 SCTP_TCB_UNLOCK(stcb); 3026 return; 3027 } 3028 /* notify upper layer protocol */ 3029 if (stcb->sctp_socket) { 3030 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3031 /* are the queues empty? they should be */ 3032 if (!TAILQ_EMPTY(&asoc->send_queue) || 3033 !TAILQ_EMPTY(&asoc->sent_queue) || 3034 !TAILQ_EMPTY(&asoc->out_wheel)) { 3035 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3036 } 3037 } 3038 /* stop the timer */ 3039 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3040 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3041 /* free the TCB */ 3042 SCTPDBG(SCTP_DEBUG_INPUT2, 3043 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3044 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3045 so = SCTP_INP_SO(stcb->sctp_ep); 3046 atomic_add_int(&stcb->asoc.refcnt, 1); 3047 SCTP_TCB_UNLOCK(stcb); 3048 SCTP_SOCKET_LOCK(so, 1); 3049 SCTP_TCB_LOCK(stcb); 3050 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3051 #endif 3052 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3053 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3054 SCTP_SOCKET_UNLOCK(so, 1); 3055 #endif 3056 return; 3057 } 3058 3059 static int 3060 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3061 struct sctp_nets *net, uint8_t flg) 3062 { 3063 switch (desc->chunk_type) { 3064 case SCTP_DATA: 3065 /* find the tsn to resend (possibly */ 3066 { 3067 uint32_t tsn; 3068 struct sctp_tmit_chunk *tp1; 3069 3070 tsn = ntohl(desc->tsn_ifany); 3071 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3072 if (tp1->rec.data.TSN_seq == tsn) { 3073 /* found it */ 3074 break; 3075 } 3076 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3077 /* not found */ 3078 tp1 = NULL; 3079 break; 3080 } 3081 } 3082 if (tp1 == NULL) { 3083 /* 3084 * Do it the other way , aka without paying 3085 * attention to queue seq order. 3086 */ 3087 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3088 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3089 if (tp1->rec.data.TSN_seq == tsn) { 3090 /* found it */ 3091 break; 3092 } 3093 } 3094 } 3095 if (tp1 == NULL) { 3096 SCTP_STAT_INCR(sctps_pdrptsnnf); 3097 } 3098 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3099 uint8_t *ddp; 3100 3101 if (((flg & SCTP_BADCRC) == 0) && 3102 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3103 return (0); 3104 } 3105 if ((stcb->asoc.peers_rwnd == 0) && 3106 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3107 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3108 return (0); 3109 } 3110 if (stcb->asoc.peers_rwnd == 0 && 3111 (flg & SCTP_FROM_MIDDLE_BOX)) { 3112 SCTP_STAT_INCR(sctps_pdrpdizrw); 3113 return (0); 3114 } 3115 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3116 sizeof(struct sctp_data_chunk)); 3117 { 3118 unsigned int iii; 3119 3120 for (iii = 0; iii < sizeof(desc->data_bytes); 3121 iii++) { 3122 if (ddp[iii] != desc->data_bytes[iii]) { 3123 SCTP_STAT_INCR(sctps_pdrpbadd); 3124 return (-1); 3125 } 3126 } 3127 } 3128 /* 3129 * We zero out the nonce so resync not 3130 * needed 3131 */ 3132 tp1->rec.data.ect_nonce = 0; 3133 3134 if (tp1->do_rtt) { 3135 /* 3136 * this guy had a RTO calculation 3137 * pending on it, cancel it 3138 */ 3139 tp1->do_rtt = 0; 3140 } 3141 SCTP_STAT_INCR(sctps_pdrpmark); 3142 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3143 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3144 /* 3145 * mark it as if we were doing a FR, since 3146 * we will be getting gap ack reports behind 3147 * the info from the router. 3148 */ 3149 tp1->rec.data.doing_fast_retransmit = 1; 3150 /* 3151 * mark the tsn with what sequences can 3152 * cause a new FR. 3153 */ 3154 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3155 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3156 } else { 3157 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3158 } 3159 3160 /* restart the timer */ 3161 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3162 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3163 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3164 stcb, tp1->whoTo); 3165 3166 /* fix counts and things */ 3167 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3168 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3169 tp1->whoTo->flight_size, 3170 tp1->book_size, 3171 (uintptr_t) stcb, 3172 tp1->rec.data.TSN_seq); 3173 } 3174 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3175 sctp_flight_size_decrease(tp1); 3176 sctp_total_flight_decrease(stcb, tp1); 3177 } 3178 tp1->sent = SCTP_DATAGRAM_RESEND; 3179 } { 3180 /* audit code */ 3181 unsigned int audit; 3182 3183 audit = 0; 3184 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3185 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3186 audit++; 3187 } 3188 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3189 sctp_next) { 3190 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3191 audit++; 3192 } 3193 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3194 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3195 audit, stcb->asoc.sent_queue_retran_cnt); 3196 #ifndef SCTP_AUDITING_ENABLED 3197 stcb->asoc.sent_queue_retran_cnt = audit; 3198 #endif 3199 } 3200 } 3201 } 3202 break; 3203 case SCTP_ASCONF: 3204 { 3205 struct sctp_tmit_chunk *asconf; 3206 3207 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3208 sctp_next) { 3209 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3210 break; 3211 } 3212 } 3213 if (asconf) { 3214 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3215 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3216 asconf->sent = SCTP_DATAGRAM_RESEND; 3217 asconf->snd_count--; 3218 } 3219 } 3220 break; 3221 case SCTP_INITIATION: 3222 /* resend the INIT */ 3223 stcb->asoc.dropped_special_cnt++; 3224 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3225 /* 3226 * If we can get it in, in a few attempts we do 3227 * this, otherwise we let the timer fire. 3228 */ 3229 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3230 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3231 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3232 } 3233 break; 3234 case SCTP_SELECTIVE_ACK: 3235 case SCTP_NR_SELECTIVE_ACK: 3236 /* resend the sack */ 3237 sctp_send_sack(stcb); 3238 break; 3239 case SCTP_HEARTBEAT_REQUEST: 3240 /* resend a demand HB */ 3241 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3242 /* 3243 * Only retransmit if we KNOW we wont destroy the 3244 * tcb 3245 */ 3246 (void)sctp_send_hb(stcb, 1, net); 3247 } 3248 break; 3249 case SCTP_SHUTDOWN: 3250 sctp_send_shutdown(stcb, net); 3251 break; 3252 case SCTP_SHUTDOWN_ACK: 3253 sctp_send_shutdown_ack(stcb, net); 3254 break; 3255 case SCTP_COOKIE_ECHO: 3256 { 3257 struct sctp_tmit_chunk *cookie; 3258 3259 cookie = NULL; 3260 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3261 sctp_next) { 3262 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3263 break; 3264 } 3265 } 3266 if (cookie) { 3267 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3268 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3269 cookie->sent = SCTP_DATAGRAM_RESEND; 3270 sctp_stop_all_cookie_timers(stcb); 3271 } 3272 } 3273 break; 3274 case SCTP_COOKIE_ACK: 3275 sctp_send_cookie_ack(stcb); 3276 break; 3277 case SCTP_ASCONF_ACK: 3278 /* resend last asconf ack */ 3279 sctp_send_asconf_ack(stcb); 3280 break; 3281 case SCTP_FORWARD_CUM_TSN: 3282 send_forward_tsn(stcb, &stcb->asoc); 3283 break; 3284 /* can't do anything with these */ 3285 case SCTP_PACKET_DROPPED: 3286 case SCTP_INITIATION_ACK: /* this should not happen */ 3287 case SCTP_HEARTBEAT_ACK: 3288 case SCTP_ABORT_ASSOCIATION: 3289 case SCTP_OPERATION_ERROR: 3290 case SCTP_SHUTDOWN_COMPLETE: 3291 case SCTP_ECN_ECHO: 3292 case SCTP_ECN_CWR: 3293 default: 3294 break; 3295 } 3296 return (0); 3297 } 3298 3299 void 3300 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3301 { 3302 int i; 3303 uint16_t temp; 3304 3305 /* 3306 * We set things to 0xffff since this is the last delivered sequence 3307 * and we will be sending in 0 after the reset. 3308 */ 3309 3310 if (number_entries) { 3311 for (i = 0; i < number_entries; i++) { 3312 temp = ntohs(list[i]); 3313 if (temp >= stcb->asoc.streamincnt) { 3314 continue; 3315 } 3316 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3317 } 3318 } else { 3319 list = NULL; 3320 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3321 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3322 } 3323 } 3324 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3325 } 3326 3327 static void 3328 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3329 { 3330 int i; 3331 3332 if (number_entries == 0) { 3333 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3334 stcb->asoc.strmout[i].next_sequence_sent = 0; 3335 } 3336 } else if (number_entries) { 3337 for (i = 0; i < number_entries; i++) { 3338 uint16_t temp; 3339 3340 temp = ntohs(list[i]); 3341 if (temp >= stcb->asoc.streamoutcnt) { 3342 /* no such stream */ 3343 continue; 3344 } 3345 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3346 } 3347 } 3348 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3349 } 3350 3351 3352 struct sctp_stream_reset_out_request * 3353 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3354 { 3355 struct sctp_association *asoc; 3356 struct sctp_stream_reset_out_req *req; 3357 struct sctp_stream_reset_out_request *r; 3358 struct sctp_tmit_chunk *chk; 3359 int len, clen; 3360 3361 asoc = &stcb->asoc; 3362 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3363 asoc->stream_reset_outstanding = 0; 3364 return (NULL); 3365 } 3366 if (stcb->asoc.str_reset == NULL) { 3367 asoc->stream_reset_outstanding = 0; 3368 return (NULL); 3369 } 3370 chk = stcb->asoc.str_reset; 3371 if (chk->data == NULL) { 3372 return (NULL); 3373 } 3374 if (bchk) { 3375 /* he wants a copy of the chk pointer */ 3376 *bchk = chk; 3377 } 3378 clen = chk->send_size; 3379 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3380 r = &req->sr_req; 3381 if (ntohl(r->request_seq) == seq) { 3382 /* found it */ 3383 return (r); 3384 } 3385 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3386 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3387 /* move to the next one, there can only be a max of two */ 3388 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3389 if (ntohl(r->request_seq) == seq) { 3390 return (r); 3391 } 3392 } 3393 /* that seq is not here */ 3394 return (NULL); 3395 } 3396 3397 static void 3398 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3399 { 3400 struct sctp_association *asoc; 3401 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3402 3403 if (stcb->asoc.str_reset == NULL) { 3404 return; 3405 } 3406 asoc = &stcb->asoc; 3407 3408 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3409 TAILQ_REMOVE(&asoc->control_send_queue, 3410 chk, 3411 sctp_next); 3412 if (chk->data) { 3413 sctp_m_freem(chk->data); 3414 chk->data = NULL; 3415 } 3416 asoc->ctrl_queue_cnt--; 3417 sctp_free_a_chunk(stcb, chk); 3418 /* sa_ignore NO_NULL_CHK */ 3419 stcb->asoc.str_reset = NULL; 3420 } 3421 3422 3423 static int 3424 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3425 uint32_t seq, uint32_t action, 3426 struct sctp_stream_reset_response *respin) 3427 { 3428 uint16_t type; 3429 int lparm_len; 3430 struct sctp_association *asoc = &stcb->asoc; 3431 struct sctp_tmit_chunk *chk; 3432 struct sctp_stream_reset_out_request *srparam; 3433 int number_entries; 3434 3435 if (asoc->stream_reset_outstanding == 0) { 3436 /* duplicate */ 3437 return (0); 3438 } 3439 if (seq == stcb->asoc.str_reset_seq_out) { 3440 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3441 if (srparam) { 3442 stcb->asoc.str_reset_seq_out++; 3443 type = ntohs(srparam->ph.param_type); 3444 lparm_len = ntohs(srparam->ph.param_length); 3445 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3446 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3447 asoc->stream_reset_out_is_outstanding = 0; 3448 if (asoc->stream_reset_outstanding) 3449 asoc->stream_reset_outstanding--; 3450 if (action == SCTP_STREAM_RESET_PERFORMED) { 3451 /* do it */ 3452 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3453 } else { 3454 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3455 } 3456 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3457 /* Answered my request */ 3458 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3459 if (asoc->stream_reset_outstanding) 3460 asoc->stream_reset_outstanding--; 3461 if (action != SCTP_STREAM_RESET_PERFORMED) { 3462 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3463 } 3464 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3465 /* Ok we now may have more streams */ 3466 if (asoc->stream_reset_outstanding) 3467 asoc->stream_reset_outstanding--; 3468 if (action == SCTP_STREAM_RESET_PERFORMED) { 3469 /* Put the new streams into effect */ 3470 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3471 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3472 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3473 } else { 3474 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3475 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3476 } 3477 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3478 /** 3479 * a) Adopt the new in tsn. 3480 * b) reset the map 3481 * c) Adopt the new out-tsn 3482 */ 3483 struct sctp_stream_reset_response_tsn *resp; 3484 struct sctp_forward_tsn_chunk fwdtsn; 3485 int abort_flag = 0; 3486 3487 if (respin == NULL) { 3488 /* huh ? */ 3489 return (0); 3490 } 3491 if (action == SCTP_STREAM_RESET_PERFORMED) { 3492 resp = (struct sctp_stream_reset_response_tsn *)respin; 3493 asoc->stream_reset_outstanding--; 3494 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3495 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3496 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3497 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3498 if (abort_flag) { 3499 return (1); 3500 } 3501 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3503 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3504 } 3505 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3506 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3507 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3508 3509 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3510 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3511 3512 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3513 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3514 3515 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3516 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3517 3518 } 3519 } 3520 /* get rid of the request and get the request flags */ 3521 if (asoc->stream_reset_outstanding == 0) { 3522 sctp_clean_up_stream_reset(stcb); 3523 } 3524 } 3525 } 3526 return (0); 3527 } 3528 3529 static void 3530 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3531 struct sctp_tmit_chunk *chk, 3532 struct sctp_stream_reset_in_request *req, int trunc) 3533 { 3534 uint32_t seq; 3535 int len, i; 3536 int number_entries; 3537 uint16_t temp; 3538 3539 /* 3540 * peer wants me to send a str-reset to him for my outgoing seq's if 3541 * seq_in is right. 3542 */ 3543 struct sctp_association *asoc = &stcb->asoc; 3544 3545 seq = ntohl(req->request_seq); 3546 if (asoc->str_reset_seq_in == seq) { 3547 if (trunc) { 3548 /* Can't do it, since they exceeded our buffer size */ 3549 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3550 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3551 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3552 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3553 len = ntohs(req->ph.param_length); 3554 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3555 for (i = 0; i < number_entries; i++) { 3556 temp = ntohs(req->list_of_streams[i]); 3557 req->list_of_streams[i] = temp; 3558 } 3559 /* move the reset action back one */ 3560 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3561 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3562 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3563 asoc->str_reset_seq_out, 3564 seq, (asoc->sending_seq - 1)); 3565 asoc->stream_reset_out_is_outstanding = 1; 3566 asoc->str_reset = chk; 3567 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3568 stcb->asoc.stream_reset_outstanding++; 3569 } else { 3570 /* Can't do it, since we have sent one out */ 3571 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3572 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3573 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3574 } 3575 asoc->str_reset_seq_in++; 3576 } else if (asoc->str_reset_seq_in - 1 == seq) { 3577 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3578 } else if (asoc->str_reset_seq_in - 2 == seq) { 3579 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3580 } else { 3581 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3582 } 3583 } 3584 3585 static int 3586 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3587 struct sctp_tmit_chunk *chk, 3588 struct sctp_stream_reset_tsn_request *req) 3589 { 3590 /* reset all in and out and update the tsn */ 3591 /* 3592 * A) reset my str-seq's on in and out. B) Select a receive next, 3593 * and set cum-ack to it. Also process this selected number as a 3594 * fwd-tsn as well. C) set in the response my next sending seq. 3595 */ 3596 struct sctp_forward_tsn_chunk fwdtsn; 3597 struct sctp_association *asoc = &stcb->asoc; 3598 int abort_flag = 0; 3599 uint32_t seq; 3600 3601 seq = ntohl(req->request_seq); 3602 if (asoc->str_reset_seq_in == seq) { 3603 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3604 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3605 fwdtsn.ch.chunk_flags = 0; 3606 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3607 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3608 if (abort_flag) { 3609 return (1); 3610 } 3611 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3612 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3613 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3614 } 3615 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3616 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3617 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3618 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3619 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3620 atomic_add_int(&stcb->asoc.sending_seq, 1); 3621 /* save off historical data for retrans */ 3622 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3623 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3624 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3625 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3626 3627 sctp_add_stream_reset_result_tsn(chk, 3628 ntohl(req->request_seq), 3629 SCTP_STREAM_RESET_PERFORMED, 3630 stcb->asoc.sending_seq, 3631 stcb->asoc.mapping_array_base_tsn); 3632 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3633 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3634 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3635 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3636 3637 asoc->str_reset_seq_in++; 3638 } else if (asoc->str_reset_seq_in - 1 == seq) { 3639 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3640 stcb->asoc.last_sending_seq[0], 3641 stcb->asoc.last_base_tsnsent[0] 3642 ); 3643 } else if (asoc->str_reset_seq_in - 2 == seq) { 3644 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3645 stcb->asoc.last_sending_seq[1], 3646 stcb->asoc.last_base_tsnsent[1] 3647 ); 3648 } else { 3649 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3650 } 3651 return (0); 3652 } 3653 3654 static void 3655 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3656 struct sctp_tmit_chunk *chk, 3657 struct sctp_stream_reset_out_request *req, int trunc) 3658 { 3659 uint32_t seq, tsn; 3660 int number_entries, len; 3661 struct sctp_association *asoc = &stcb->asoc; 3662 3663 seq = ntohl(req->request_seq); 3664 3665 /* now if its not a duplicate we process it */ 3666 if (asoc->str_reset_seq_in == seq) { 3667 len = ntohs(req->ph.param_length); 3668 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3669 /* 3670 * the sender is resetting, handle the list issue.. we must 3671 * a) verify if we can do the reset, if so no problem b) If 3672 * we can't do the reset we must copy the request. c) queue 3673 * it, and setup the data in processor to trigger it off 3674 * when needed and dequeue all the queued data. 3675 */ 3676 tsn = ntohl(req->send_reset_at_tsn); 3677 3678 /* move the reset action back one */ 3679 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3680 if (trunc) { 3681 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3682 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3683 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3684 /* we can do it now */ 3685 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3686 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3687 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3688 } else { 3689 /* 3690 * we must queue it up and thus wait for the TSN's 3691 * to arrive that are at or before tsn 3692 */ 3693 struct sctp_stream_reset_list *liste; 3694 int siz; 3695 3696 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3697 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3698 siz, SCTP_M_STRESET); 3699 if (liste == NULL) { 3700 /* gak out of memory */ 3701 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3702 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3703 return; 3704 } 3705 liste->tsn = tsn; 3706 liste->number_entries = number_entries; 3707 memcpy(&liste->req, req, 3708 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3709 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3710 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3711 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3712 } 3713 asoc->str_reset_seq_in++; 3714 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3715 /* 3716 * one seq back, just echo back last action since my 3717 * response was lost. 3718 */ 3719 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3720 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3721 /* 3722 * two seq back, just echo back last action since my 3723 * response was lost. 3724 */ 3725 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3726 } else { 3727 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3728 } 3729 } 3730 3731 static void 3732 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3733 struct sctp_stream_reset_add_strm *str_add) 3734 { 3735 /* 3736 * Peer is requesting to add more streams. If its within our 3737 * max-streams we will allow it. 3738 */ 3739 uint16_t num_stream, i; 3740 uint32_t seq; 3741 struct sctp_association *asoc = &stcb->asoc; 3742 struct sctp_queued_to_read *ctl, *nctl; 3743 3744 /* Get the number. */ 3745 seq = ntohl(str_add->request_seq); 3746 num_stream = ntohs(str_add->number_of_streams); 3747 /* Now what would be the new total? */ 3748 if (asoc->str_reset_seq_in == seq) { 3749 num_stream += stcb->asoc.streamincnt; 3750 if (num_stream > stcb->asoc.max_inbound_streams) { 3751 /* We must reject it they ask for to many */ 3752 denied: 3753 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3754 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3755 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3756 } else { 3757 /* Ok, we can do that :-) */ 3758 struct sctp_stream_in *oldstrm; 3759 3760 /* save off the old */ 3761 oldstrm = stcb->asoc.strmin; 3762 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3763 (num_stream * sizeof(struct sctp_stream_in)), 3764 SCTP_M_STRMI); 3765 if (stcb->asoc.strmin == NULL) { 3766 stcb->asoc.strmin = oldstrm; 3767 goto denied; 3768 } 3769 /* copy off the old data */ 3770 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3771 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3772 stcb->asoc.strmin[i].stream_no = i; 3773 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3774 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3775 /* now anything on those queues? */ 3776 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3777 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3778 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3779 } 3780 } 3781 /* Init the new streams */ 3782 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3783 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3784 stcb->asoc.strmin[i].stream_no = i; 3785 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3786 stcb->asoc.strmin[i].delivery_started = 0; 3787 } 3788 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3789 /* update the size */ 3790 stcb->asoc.streamincnt = num_stream; 3791 /* Send the ack */ 3792 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3793 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3794 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3795 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3796 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3797 } 3798 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3799 /* 3800 * one seq back, just echo back last action since my 3801 * response was lost. 3802 */ 3803 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3804 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3805 /* 3806 * two seq back, just echo back last action since my 3807 * response was lost. 3808 */ 3809 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3810 } else { 3811 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3812 3813 } 3814 } 3815 3816 #ifdef __GNUC__ 3817 __attribute__((noinline)) 3818 #endif 3819 static int 3820 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3821 struct sctp_stream_reset_out_req *sr_req) 3822 { 3823 int chk_length, param_len, ptype; 3824 struct sctp_paramhdr pstore; 3825 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3826 3827 uint32_t seq; 3828 int num_req = 0; 3829 int trunc = 0; 3830 struct sctp_tmit_chunk *chk; 3831 struct sctp_chunkhdr *ch; 3832 struct sctp_paramhdr *ph; 3833 int ret_code = 0; 3834 int num_param = 0; 3835 3836 /* now it may be a reset or a reset-response */ 3837 chk_length = ntohs(sr_req->ch.chunk_length); 3838 3839 /* setup for adding the response */ 3840 sctp_alloc_a_chunk(stcb, chk); 3841 if (chk == NULL) { 3842 return (ret_code); 3843 } 3844 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3845 chk->rec.chunk_id.can_take_data = 0; 3846 chk->asoc = &stcb->asoc; 3847 chk->no_fr_allowed = 0; 3848 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3849 chk->book_size_scale = 0; 3850 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3851 if (chk->data == NULL) { 3852 strres_nochunk: 3853 if (chk->data) { 3854 sctp_m_freem(chk->data); 3855 chk->data = NULL; 3856 } 3857 sctp_free_a_chunk(stcb, chk); 3858 return (ret_code); 3859 } 3860 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3861 3862 /* setup chunk parameters */ 3863 chk->sent = SCTP_DATAGRAM_UNSENT; 3864 chk->snd_count = 0; 3865 chk->whoTo = stcb->asoc.primary_destination; 3866 atomic_add_int(&chk->whoTo->ref_count, 1); 3867 3868 ch = mtod(chk->data, struct sctp_chunkhdr *); 3869 ch->chunk_type = SCTP_STREAM_RESET; 3870 ch->chunk_flags = 0; 3871 ch->chunk_length = htons(chk->send_size); 3872 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3873 offset += sizeof(struct sctp_chunkhdr); 3874 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3875 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3876 if (ph == NULL) 3877 break; 3878 param_len = ntohs(ph->param_length); 3879 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3880 /* bad param */ 3881 break; 3882 } 3883 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3884 (uint8_t *) & cstore); 3885 ptype = ntohs(ph->param_type); 3886 num_param++; 3887 if (param_len > (int)sizeof(cstore)) { 3888 trunc = 1; 3889 } else { 3890 trunc = 0; 3891 } 3892 3893 if (num_param > SCTP_MAX_RESET_PARAMS) { 3894 /* hit the max of parameters already sorry.. */ 3895 break; 3896 } 3897 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3898 struct sctp_stream_reset_out_request *req_out; 3899 3900 req_out = (struct sctp_stream_reset_out_request *)ph; 3901 num_req++; 3902 if (stcb->asoc.stream_reset_outstanding) { 3903 seq = ntohl(req_out->response_seq); 3904 if (seq == stcb->asoc.str_reset_seq_out) { 3905 /* implicit ack */ 3906 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3907 } 3908 } 3909 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3910 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3911 struct sctp_stream_reset_add_strm *str_add; 3912 3913 str_add = (struct sctp_stream_reset_add_strm *)ph; 3914 num_req++; 3915 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3916 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3917 struct sctp_stream_reset_in_request *req_in; 3918 3919 num_req++; 3920 3921 req_in = (struct sctp_stream_reset_in_request *)ph; 3922 3923 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3924 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3925 struct sctp_stream_reset_tsn_request *req_tsn; 3926 3927 num_req++; 3928 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3929 3930 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3931 ret_code = 1; 3932 goto strres_nochunk; 3933 } 3934 /* no more */ 3935 break; 3936 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3937 struct sctp_stream_reset_response *resp; 3938 uint32_t result; 3939 3940 resp = (struct sctp_stream_reset_response *)ph; 3941 seq = ntohl(resp->response_seq); 3942 result = ntohl(resp->result); 3943 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3944 ret_code = 1; 3945 goto strres_nochunk; 3946 } 3947 } else { 3948 break; 3949 } 3950 offset += SCTP_SIZE32(param_len); 3951 chk_length -= SCTP_SIZE32(param_len); 3952 } 3953 if (num_req == 0) { 3954 /* we have no response free the stuff */ 3955 goto strres_nochunk; 3956 } 3957 /* ok we have a chunk to link in */ 3958 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3959 chk, 3960 sctp_next); 3961 stcb->asoc.ctrl_queue_cnt++; 3962 return (ret_code); 3963 } 3964 3965 /* 3966 * Handle a router or endpoints report of a packet loss, there are two ways 3967 * to handle this, either we get the whole packet and must disect it 3968 * ourselves (possibly with truncation and or corruption) or it is a summary 3969 * from a middle box that did the disectting for us. 3970 */ 3971 static void 3972 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3973 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3974 { 3975 uint32_t bottle_bw, on_queue; 3976 uint16_t trunc_len; 3977 unsigned int chlen; 3978 unsigned int at; 3979 struct sctp_chunk_desc desc; 3980 struct sctp_chunkhdr *ch; 3981 3982 chlen = ntohs(cp->ch.chunk_length); 3983 chlen -= sizeof(struct sctp_pktdrop_chunk); 3984 /* XXX possible chlen underflow */ 3985 if (chlen == 0) { 3986 ch = NULL; 3987 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3988 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3989 } else { 3990 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3991 chlen -= sizeof(struct sctphdr); 3992 /* XXX possible chlen underflow */ 3993 memset(&desc, 0, sizeof(desc)); 3994 } 3995 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3996 if (trunc_len > limit) { 3997 trunc_len = limit; 3998 } 3999 /* now the chunks themselves */ 4000 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4001 desc.chunk_type = ch->chunk_type; 4002 /* get amount we need to move */ 4003 at = ntohs(ch->chunk_length); 4004 if (at < sizeof(struct sctp_chunkhdr)) { 4005 /* corrupt chunk, maybe at the end? */ 4006 SCTP_STAT_INCR(sctps_pdrpcrupt); 4007 break; 4008 } 4009 if (trunc_len == 0) { 4010 /* we are supposed to have all of it */ 4011 if (at > chlen) { 4012 /* corrupt skip it */ 4013 SCTP_STAT_INCR(sctps_pdrpcrupt); 4014 break; 4015 } 4016 } else { 4017 /* is there enough of it left ? */ 4018 if (desc.chunk_type == SCTP_DATA) { 4019 if (chlen < (sizeof(struct sctp_data_chunk) + 4020 sizeof(desc.data_bytes))) { 4021 break; 4022 } 4023 } else { 4024 if (chlen < sizeof(struct sctp_chunkhdr)) { 4025 break; 4026 } 4027 } 4028 } 4029 if (desc.chunk_type == SCTP_DATA) { 4030 /* can we get out the tsn? */ 4031 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4032 SCTP_STAT_INCR(sctps_pdrpmbda); 4033 4034 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4035 /* yep */ 4036 struct sctp_data_chunk *dcp; 4037 uint8_t *ddp; 4038 unsigned int iii; 4039 4040 dcp = (struct sctp_data_chunk *)ch; 4041 ddp = (uint8_t *) (dcp + 1); 4042 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4043 desc.data_bytes[iii] = ddp[iii]; 4044 } 4045 desc.tsn_ifany = dcp->dp.tsn; 4046 } else { 4047 /* nope we are done. */ 4048 SCTP_STAT_INCR(sctps_pdrpnedat); 4049 break; 4050 } 4051 } else { 4052 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4053 SCTP_STAT_INCR(sctps_pdrpmbct); 4054 } 4055 4056 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4057 SCTP_STAT_INCR(sctps_pdrppdbrk); 4058 break; 4059 } 4060 if (SCTP_SIZE32(at) > chlen) { 4061 break; 4062 } 4063 chlen -= SCTP_SIZE32(at); 4064 if (chlen < sizeof(struct sctp_chunkhdr)) { 4065 /* done, none left */ 4066 break; 4067 } 4068 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4069 } 4070 /* Now update any rwnd --- possibly */ 4071 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4072 /* From a peer, we get a rwnd report */ 4073 uint32_t a_rwnd; 4074 4075 SCTP_STAT_INCR(sctps_pdrpfehos); 4076 4077 bottle_bw = ntohl(cp->bottle_bw); 4078 on_queue = ntohl(cp->current_onq); 4079 if (bottle_bw && on_queue) { 4080 /* a rwnd report is in here */ 4081 if (bottle_bw > on_queue) 4082 a_rwnd = bottle_bw - on_queue; 4083 else 4084 a_rwnd = 0; 4085 4086 if (a_rwnd == 0) 4087 stcb->asoc.peers_rwnd = 0; 4088 else { 4089 if (a_rwnd > stcb->asoc.total_flight) { 4090 stcb->asoc.peers_rwnd = 4091 a_rwnd - stcb->asoc.total_flight; 4092 } else { 4093 stcb->asoc.peers_rwnd = 0; 4094 } 4095 if (stcb->asoc.peers_rwnd < 4096 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4097 /* SWS sender side engages */ 4098 stcb->asoc.peers_rwnd = 0; 4099 } 4100 } 4101 } 4102 } else { 4103 SCTP_STAT_INCR(sctps_pdrpfmbox); 4104 } 4105 4106 /* now middle boxes in sat networks get a cwnd bump */ 4107 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4108 (stcb->asoc.sat_t3_loss_recovery == 0) && 4109 (stcb->asoc.sat_network)) { 4110 /* 4111 * This is debateable but for sat networks it makes sense 4112 * Note if a T3 timer has went off, we will prohibit any 4113 * changes to cwnd until we exit the t3 loss recovery. 4114 */ 4115 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4116 net, cp, &bottle_bw, &on_queue); 4117 } 4118 } 4119 4120 /* 4121 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4122 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4123 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4124 * length of the complete packet outputs: - length: modified to remaining 4125 * length after control processing - netp: modified to new sctp_nets after 4126 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4127 * bad packet,...) otherwise return the tcb for this packet 4128 */ 4129 #ifdef __GNUC__ 4130 __attribute__((noinline)) 4131 #endif 4132 static struct sctp_tcb * 4133 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4134 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4135 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4136 uint32_t vrf_id, uint16_t port) 4137 { 4138 struct sctp_association *asoc; 4139 uint32_t vtag_in; 4140 int num_chunks = 0; /* number of control chunks processed */ 4141 uint32_t chk_length; 4142 int ret; 4143 int abort_no_unlock = 0; 4144 4145 /* 4146 * How big should this be, and should it be alloc'd? Lets try the 4147 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4148 * until we get into jumbo grams and such.. 4149 */ 4150 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4151 struct sctp_tcb *locked_tcb = stcb; 4152 int got_auth = 0; 4153 uint32_t auth_offset = 0, auth_len = 0; 4154 int auth_skipped = 0; 4155 int asconf_cnt = 0; 4156 4157 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4158 struct socket *so; 4159 4160 #endif 4161 4162 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4163 iphlen, *offset, length, stcb); 4164 4165 /* validate chunk header length... */ 4166 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4167 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4168 ntohs(ch->chunk_length)); 4169 if (locked_tcb) { 4170 SCTP_TCB_UNLOCK(locked_tcb); 4171 } 4172 return (NULL); 4173 } 4174 /* 4175 * validate the verification tag 4176 */ 4177 vtag_in = ntohl(sh->v_tag); 4178 4179 if (locked_tcb) { 4180 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4181 } 4182 if (ch->chunk_type == SCTP_INITIATION) { 4183 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4184 ntohs(ch->chunk_length), vtag_in); 4185 if (vtag_in != 0) { 4186 /* protocol error- silently discard... */ 4187 SCTP_STAT_INCR(sctps_badvtag); 4188 if (locked_tcb) { 4189 SCTP_TCB_UNLOCK(locked_tcb); 4190 } 4191 return (NULL); 4192 } 4193 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4194 /* 4195 * If there is no stcb, skip the AUTH chunk and process 4196 * later after a stcb is found (to validate the lookup was 4197 * valid. 4198 */ 4199 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4200 (stcb == NULL) && 4201 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4202 /* save this chunk for later processing */ 4203 auth_skipped = 1; 4204 auth_offset = *offset; 4205 auth_len = ntohs(ch->chunk_length); 4206 4207 /* (temporarily) move past this chunk */ 4208 *offset += SCTP_SIZE32(auth_len); 4209 if (*offset >= length) { 4210 /* no more data left in the mbuf chain */ 4211 *offset = length; 4212 if (locked_tcb) { 4213 SCTP_TCB_UNLOCK(locked_tcb); 4214 } 4215 return (NULL); 4216 } 4217 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4218 sizeof(struct sctp_chunkhdr), chunk_buf); 4219 } 4220 if (ch == NULL) { 4221 /* Help */ 4222 *offset = length; 4223 if (locked_tcb) { 4224 SCTP_TCB_UNLOCK(locked_tcb); 4225 } 4226 return (NULL); 4227 } 4228 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4229 goto process_control_chunks; 4230 } 4231 /* 4232 * first check if it's an ASCONF with an unknown src addr we 4233 * need to look inside to find the association 4234 */ 4235 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4236 struct sctp_chunkhdr *asconf_ch = ch; 4237 uint32_t asconf_offset = 0, asconf_len = 0; 4238 4239 /* inp's refcount may be reduced */ 4240 SCTP_INP_INCR_REF(inp); 4241 4242 asconf_offset = *offset; 4243 do { 4244 asconf_len = ntohs(asconf_ch->chunk_length); 4245 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4246 break; 4247 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4248 *offset, sh, &inp, netp, vrf_id); 4249 if (stcb != NULL) 4250 break; 4251 asconf_offset += SCTP_SIZE32(asconf_len); 4252 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4253 sizeof(struct sctp_chunkhdr), chunk_buf); 4254 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4255 if (stcb == NULL) { 4256 /* 4257 * reduce inp's refcount if not reduced in 4258 * sctp_findassociation_ep_asconf(). 4259 */ 4260 SCTP_INP_DECR_REF(inp); 4261 } else { 4262 locked_tcb = stcb; 4263 } 4264 4265 /* now go back and verify any auth chunk to be sure */ 4266 if (auth_skipped && (stcb != NULL)) { 4267 struct sctp_auth_chunk *auth; 4268 4269 auth = (struct sctp_auth_chunk *) 4270 sctp_m_getptr(m, auth_offset, 4271 auth_len, chunk_buf); 4272 got_auth = 1; 4273 auth_skipped = 0; 4274 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4275 auth_offset)) { 4276 /* auth HMAC failed so dump it */ 4277 *offset = length; 4278 if (locked_tcb) { 4279 SCTP_TCB_UNLOCK(locked_tcb); 4280 } 4281 return (NULL); 4282 } else { 4283 /* remaining chunks are HMAC checked */ 4284 stcb->asoc.authenticated = 1; 4285 } 4286 } 4287 } 4288 if (stcb == NULL) { 4289 /* no association, so it's out of the blue... */ 4290 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4291 vrf_id, port); 4292 *offset = length; 4293 if (locked_tcb) { 4294 SCTP_TCB_UNLOCK(locked_tcb); 4295 } 4296 return (NULL); 4297 } 4298 asoc = &stcb->asoc; 4299 /* ABORT and SHUTDOWN can use either v_tag... */ 4300 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4301 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4302 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4303 if ((vtag_in == asoc->my_vtag) || 4304 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4305 (vtag_in == asoc->peer_vtag))) { 4306 /* this is valid */ 4307 } else { 4308 /* drop this packet... */ 4309 SCTP_STAT_INCR(sctps_badvtag); 4310 if (locked_tcb) { 4311 SCTP_TCB_UNLOCK(locked_tcb); 4312 } 4313 return (NULL); 4314 } 4315 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4316 if (vtag_in != asoc->my_vtag) { 4317 /* 4318 * this could be a stale SHUTDOWN-ACK or the 4319 * peer never got the SHUTDOWN-COMPLETE and 4320 * is still hung; we have started a new asoc 4321 * but it won't complete until the shutdown 4322 * is completed 4323 */ 4324 if (locked_tcb) { 4325 SCTP_TCB_UNLOCK(locked_tcb); 4326 } 4327 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4328 NULL, vrf_id, port); 4329 return (NULL); 4330 } 4331 } else { 4332 /* for all other chunks, vtag must match */ 4333 if (vtag_in != asoc->my_vtag) { 4334 /* invalid vtag... */ 4335 SCTPDBG(SCTP_DEBUG_INPUT3, 4336 "invalid vtag: %xh, expect %xh\n", 4337 vtag_in, asoc->my_vtag); 4338 SCTP_STAT_INCR(sctps_badvtag); 4339 if (locked_tcb) { 4340 SCTP_TCB_UNLOCK(locked_tcb); 4341 } 4342 *offset = length; 4343 return (NULL); 4344 } 4345 } 4346 } /* end if !SCTP_COOKIE_ECHO */ 4347 /* 4348 * process all control chunks... 4349 */ 4350 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4351 /* EY */ 4352 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4353 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4354 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4355 /* implied cookie-ack.. we must have lost the ack */ 4356 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4357 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4358 stcb->asoc.overall_error_count, 4359 0, 4360 SCTP_FROM_SCTP_INPUT, 4361 __LINE__); 4362 } 4363 stcb->asoc.overall_error_count = 0; 4364 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4365 *netp); 4366 } 4367 process_control_chunks: 4368 while (IS_SCTP_CONTROL(ch)) { 4369 /* validate chunk length */ 4370 chk_length = ntohs(ch->chunk_length); 4371 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4372 ch->chunk_type, chk_length); 4373 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4374 if (chk_length < sizeof(*ch) || 4375 (*offset + (int)chk_length) > length) { 4376 *offset = length; 4377 if (locked_tcb) { 4378 SCTP_TCB_UNLOCK(locked_tcb); 4379 } 4380 return (NULL); 4381 } 4382 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4383 /* 4384 * INIT-ACK only gets the init ack "header" portion only 4385 * because we don't have to process the peer's COOKIE. All 4386 * others get a complete chunk. 4387 */ 4388 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4389 (ch->chunk_type == SCTP_INITIATION)) { 4390 /* get an init-ack chunk */ 4391 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4392 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4393 if (ch == NULL) { 4394 *offset = length; 4395 if (locked_tcb) { 4396 SCTP_TCB_UNLOCK(locked_tcb); 4397 } 4398 return (NULL); 4399 } 4400 } else { 4401 /* For cookies and all other chunks. */ 4402 if (chk_length > sizeof(chunk_buf)) { 4403 /* 4404 * use just the size of the chunk buffer so 4405 * the front part of our chunks fit in 4406 * contiguous space up to the chunk buffer 4407 * size (508 bytes). For chunks that need to 4408 * get more than that they must use the 4409 * sctp_m_getptr() function or other means 4410 * (e.g. know how to parse mbuf chains). 4411 * Cookies do this already. 4412 */ 4413 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4414 (sizeof(chunk_buf) - 4), 4415 chunk_buf); 4416 if (ch == NULL) { 4417 *offset = length; 4418 if (locked_tcb) { 4419 SCTP_TCB_UNLOCK(locked_tcb); 4420 } 4421 return (NULL); 4422 } 4423 } else { 4424 /* We can fit it all */ 4425 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4426 chk_length, chunk_buf); 4427 if (ch == NULL) { 4428 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4429 *offset = length; 4430 if (locked_tcb) { 4431 SCTP_TCB_UNLOCK(locked_tcb); 4432 } 4433 return (NULL); 4434 } 4435 } 4436 } 4437 num_chunks++; 4438 /* Save off the last place we got a control from */ 4439 if (stcb != NULL) { 4440 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4441 /* 4442 * allow last_control to be NULL if 4443 * ASCONF... ASCONF processing will find the 4444 * right net later 4445 */ 4446 if ((netp != NULL) && (*netp != NULL)) 4447 stcb->asoc.last_control_chunk_from = *netp; 4448 } 4449 } 4450 #ifdef SCTP_AUDITING_ENABLED 4451 sctp_audit_log(0xB0, ch->chunk_type); 4452 #endif 4453 4454 /* check to see if this chunk required auth, but isn't */ 4455 if ((stcb != NULL) && 4456 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4457 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4458 !stcb->asoc.authenticated) { 4459 /* "silently" ignore */ 4460 SCTP_STAT_INCR(sctps_recvauthmissing); 4461 goto next_chunk; 4462 } 4463 switch (ch->chunk_type) { 4464 case SCTP_INITIATION: 4465 /* must be first and only chunk */ 4466 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4467 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4468 /* We are not interested anymore? */ 4469 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4470 /* 4471 * collision case where we are 4472 * sending to them too 4473 */ 4474 ; 4475 } else { 4476 if (locked_tcb) { 4477 SCTP_TCB_UNLOCK(locked_tcb); 4478 } 4479 *offset = length; 4480 return (NULL); 4481 } 4482 } 4483 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4484 (num_chunks > 1) || 4485 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4486 *offset = length; 4487 if (locked_tcb) { 4488 SCTP_TCB_UNLOCK(locked_tcb); 4489 } 4490 return (NULL); 4491 } 4492 if ((stcb != NULL) && 4493 (SCTP_GET_STATE(&stcb->asoc) == 4494 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4495 sctp_send_shutdown_ack(stcb, 4496 stcb->asoc.primary_destination); 4497 *offset = length; 4498 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4499 if (locked_tcb) { 4500 SCTP_TCB_UNLOCK(locked_tcb); 4501 } 4502 return (NULL); 4503 } 4504 if (netp) { 4505 sctp_handle_init(m, iphlen, *offset, sh, 4506 (struct sctp_init_chunk *)ch, inp, 4507 stcb, *netp, &abort_no_unlock, vrf_id, port); 4508 } 4509 if (abort_no_unlock) 4510 return (NULL); 4511 4512 *offset = length; 4513 if (locked_tcb) { 4514 SCTP_TCB_UNLOCK(locked_tcb); 4515 } 4516 return (NULL); 4517 break; 4518 case SCTP_PAD_CHUNK: 4519 break; 4520 case SCTP_INITIATION_ACK: 4521 /* must be first and only chunk */ 4522 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4523 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4524 /* We are not interested anymore */ 4525 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4526 ; 4527 } else { 4528 if (locked_tcb != stcb) { 4529 /* Very unlikely */ 4530 SCTP_TCB_UNLOCK(locked_tcb); 4531 } 4532 *offset = length; 4533 if (stcb) { 4534 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4535 so = SCTP_INP_SO(inp); 4536 atomic_add_int(&stcb->asoc.refcnt, 1); 4537 SCTP_TCB_UNLOCK(stcb); 4538 SCTP_SOCKET_LOCK(so, 1); 4539 SCTP_TCB_LOCK(stcb); 4540 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4541 #endif 4542 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4543 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4544 SCTP_SOCKET_UNLOCK(so, 1); 4545 #endif 4546 } 4547 return (NULL); 4548 } 4549 } 4550 if ((num_chunks > 1) || 4551 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4552 *offset = length; 4553 if (locked_tcb) { 4554 SCTP_TCB_UNLOCK(locked_tcb); 4555 } 4556 return (NULL); 4557 } 4558 if ((netp) && (*netp)) { 4559 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4560 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4561 } else { 4562 ret = -1; 4563 } 4564 /* 4565 * Special case, I must call the output routine to 4566 * get the cookie echoed 4567 */ 4568 if (abort_no_unlock) 4569 return (NULL); 4570 4571 if ((stcb) && ret == 0) 4572 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4573 *offset = length; 4574 if (locked_tcb) { 4575 SCTP_TCB_UNLOCK(locked_tcb); 4576 } 4577 return (NULL); 4578 break; 4579 case SCTP_SELECTIVE_ACK: 4580 { 4581 struct sctp_sack_chunk *sack; 4582 int abort_now = 0; 4583 uint32_t a_rwnd, cum_ack; 4584 uint16_t num_seg, num_dup; 4585 uint8_t flags; 4586 int offset_seg, offset_dup; 4587 int nonce_sum_flag; 4588 4589 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4590 SCTP_STAT_INCR(sctps_recvsacks); 4591 if (stcb == NULL) { 4592 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4593 break; 4594 } 4595 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4596 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4597 break; 4598 } 4599 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4600 /*- 4601 * If we have sent a shutdown-ack, we will pay no 4602 * attention to a sack sent in to us since 4603 * we don't care anymore. 4604 */ 4605 break; 4606 } 4607 sack = (struct sctp_sack_chunk *)ch; 4608 flags = ch->chunk_flags; 4609 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4610 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4611 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4612 num_dup = ntohs(sack->sack.num_dup_tsns); 4613 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4614 if (sizeof(struct sctp_sack_chunk) + 4615 num_seg * sizeof(struct sctp_gap_ack_block) + 4616 num_dup * sizeof(uint32_t) != chk_length) { 4617 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4618 break; 4619 } 4620 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4621 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4622 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4623 cum_ack, num_seg, a_rwnd); 4624 stcb->asoc.seen_a_sack_this_pkt = 1; 4625 if ((stcb->asoc.pr_sctp_cnt == 0) && 4626 (num_seg == 0) && 4627 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4628 (stcb->asoc.saw_sack_with_frags == 0) && 4629 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4630 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4631 ) { 4632 /* 4633 * We have a SIMPLE sack having no 4634 * prior segments and data on sent 4635 * queue to be acked.. Use the 4636 * faster path sack processing. We 4637 * also allow window update sacks 4638 * with no missing segments to go 4639 * this way too. 4640 */ 4641 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4642 &abort_now); 4643 } else { 4644 if (netp && *netp) 4645 sctp_handle_sack(m, offset_seg, offset_dup, 4646 stcb, *netp, 4647 num_seg, 0, num_dup, &abort_now, flags, 4648 cum_ack, a_rwnd); 4649 } 4650 if (abort_now) { 4651 /* ABORT signal from sack processing */ 4652 *offset = length; 4653 return (NULL); 4654 } 4655 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4656 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4657 (stcb->asoc.stream_queue_cnt == 0)) { 4658 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4659 } 4660 } 4661 break; 4662 /* 4663 * EY - nr_sack: If the received chunk is an 4664 * nr_sack chunk 4665 */ 4666 case SCTP_NR_SELECTIVE_ACK: 4667 { 4668 struct sctp_nr_sack_chunk *nr_sack; 4669 int abort_now = 0; 4670 uint32_t a_rwnd, cum_ack; 4671 uint16_t num_seg, num_nr_seg, num_dup; 4672 uint8_t flags; 4673 int offset_seg, offset_dup; 4674 int nonce_sum_flag; 4675 4676 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4677 SCTP_STAT_INCR(sctps_recvsacks); 4678 if (stcb == NULL) { 4679 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4680 break; 4681 } 4682 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4683 (stcb->asoc.peer_supports_nr_sack == 0)) { 4684 goto unknown_chunk; 4685 } 4686 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4687 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4688 break; 4689 } 4690 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4691 /*- 4692 * If we have sent a shutdown-ack, we will pay no 4693 * attention to a sack sent in to us since 4694 * we don't care anymore. 4695 */ 4696 break; 4697 } 4698 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4699 flags = ch->chunk_flags; 4700 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4701 4702 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4703 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4704 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4705 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4706 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4707 if (sizeof(struct sctp_nr_sack_chunk) + 4708 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4709 num_dup * sizeof(uint32_t) != chk_length) { 4710 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4711 break; 4712 } 4713 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4714 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4715 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4716 cum_ack, num_seg, a_rwnd); 4717 stcb->asoc.seen_a_sack_this_pkt = 1; 4718 if ((stcb->asoc.pr_sctp_cnt == 0) && 4719 (num_seg == 0) && (num_nr_seg == 0) && 4720 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4721 (stcb->asoc.saw_sack_with_frags == 0) && 4722 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4723 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4724 /* 4725 * We have a SIMPLE sack having no 4726 * prior segments and data on sent 4727 * queue to be acked. Use the faster 4728 * path sack processing. We also 4729 * allow window update sacks with no 4730 * missing segments to go this way 4731 * too. 4732 */ 4733 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4734 &abort_now); 4735 } else { 4736 if (netp && *netp) 4737 sctp_handle_sack(m, offset_seg, offset_dup, 4738 stcb, *netp, 4739 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4740 cum_ack, a_rwnd); 4741 } 4742 if (abort_now) { 4743 /* ABORT signal from sack processing */ 4744 *offset = length; 4745 return (NULL); 4746 } 4747 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4748 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4749 (stcb->asoc.stream_queue_cnt == 0)) { 4750 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4751 } 4752 } 4753 break; 4754 4755 case SCTP_HEARTBEAT_REQUEST: 4756 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4757 if ((stcb) && netp && *netp) { 4758 SCTP_STAT_INCR(sctps_recvheartbeat); 4759 sctp_send_heartbeat_ack(stcb, m, *offset, 4760 chk_length, *netp); 4761 4762 /* He's alive so give him credit */ 4763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4764 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4765 stcb->asoc.overall_error_count, 4766 0, 4767 SCTP_FROM_SCTP_INPUT, 4768 __LINE__); 4769 } 4770 stcb->asoc.overall_error_count = 0; 4771 } 4772 break; 4773 case SCTP_HEARTBEAT_ACK: 4774 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4775 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4776 /* Its not ours */ 4777 *offset = length; 4778 if (locked_tcb) { 4779 SCTP_TCB_UNLOCK(locked_tcb); 4780 } 4781 return (NULL); 4782 } 4783 /* He's alive so give him credit */ 4784 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4785 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4786 stcb->asoc.overall_error_count, 4787 0, 4788 SCTP_FROM_SCTP_INPUT, 4789 __LINE__); 4790 } 4791 stcb->asoc.overall_error_count = 0; 4792 SCTP_STAT_INCR(sctps_recvheartbeatack); 4793 if (netp && *netp) 4794 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4795 stcb, *netp); 4796 break; 4797 case SCTP_ABORT_ASSOCIATION: 4798 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4799 stcb); 4800 if ((stcb) && netp && *netp) 4801 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4802 stcb, *netp); 4803 *offset = length; 4804 return (NULL); 4805 break; 4806 case SCTP_SHUTDOWN: 4807 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4808 stcb); 4809 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4810 *offset = length; 4811 if (locked_tcb) { 4812 SCTP_TCB_UNLOCK(locked_tcb); 4813 } 4814 return (NULL); 4815 } 4816 if (netp && *netp) { 4817 int abort_flag = 0; 4818 4819 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4820 stcb, *netp, &abort_flag); 4821 if (abort_flag) { 4822 *offset = length; 4823 return (NULL); 4824 } 4825 } 4826 break; 4827 case SCTP_SHUTDOWN_ACK: 4828 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4829 if ((stcb) && (netp) && (*netp)) 4830 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4831 *offset = length; 4832 return (NULL); 4833 break; 4834 4835 case SCTP_OPERATION_ERROR: 4836 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4837 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4838 4839 *offset = length; 4840 return (NULL); 4841 } 4842 break; 4843 case SCTP_COOKIE_ECHO: 4844 SCTPDBG(SCTP_DEBUG_INPUT3, 4845 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4846 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4847 ; 4848 } else { 4849 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4850 /* We are not interested anymore */ 4851 abend: 4852 if (stcb) { 4853 SCTP_TCB_UNLOCK(stcb); 4854 } 4855 *offset = length; 4856 return (NULL); 4857 } 4858 } 4859 /* 4860 * First are we accepting? We do this again here 4861 * since it is possible that a previous endpoint WAS 4862 * listening responded to a INIT-ACK and then 4863 * closed. We opened and bound.. and are now no 4864 * longer listening. 4865 */ 4866 4867 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4868 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4869 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4870 struct mbuf *oper; 4871 struct sctp_paramhdr *phdr; 4872 4873 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4874 0, M_DONTWAIT, 1, MT_DATA); 4875 if (oper) { 4876 SCTP_BUF_LEN(oper) = 4877 sizeof(struct sctp_paramhdr); 4878 phdr = mtod(oper, 4879 struct sctp_paramhdr *); 4880 phdr->param_type = 4881 htons(SCTP_CAUSE_OUT_OF_RESC); 4882 phdr->param_length = 4883 htons(sizeof(struct sctp_paramhdr)); 4884 } 4885 sctp_abort_association(inp, stcb, m, 4886 iphlen, sh, oper, vrf_id, port); 4887 } 4888 *offset = length; 4889 return (NULL); 4890 } else { 4891 struct mbuf *ret_buf; 4892 struct sctp_inpcb *linp; 4893 4894 if (stcb) { 4895 linp = NULL; 4896 } else { 4897 linp = inp; 4898 } 4899 4900 if (linp) { 4901 SCTP_ASOC_CREATE_LOCK(linp); 4902 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4903 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4904 SCTP_ASOC_CREATE_UNLOCK(linp); 4905 goto abend; 4906 } 4907 } 4908 if (netp) { 4909 ret_buf = 4910 sctp_handle_cookie_echo(m, iphlen, 4911 *offset, sh, 4912 (struct sctp_cookie_echo_chunk *)ch, 4913 &inp, &stcb, netp, 4914 auth_skipped, 4915 auth_offset, 4916 auth_len, 4917 &locked_tcb, 4918 vrf_id, 4919 port); 4920 } else { 4921 ret_buf = NULL; 4922 } 4923 if (linp) { 4924 SCTP_ASOC_CREATE_UNLOCK(linp); 4925 } 4926 if (ret_buf == NULL) { 4927 if (locked_tcb) { 4928 SCTP_TCB_UNLOCK(locked_tcb); 4929 } 4930 SCTPDBG(SCTP_DEBUG_INPUT3, 4931 "GAK, null buffer\n"); 4932 auth_skipped = 0; 4933 *offset = length; 4934 return (NULL); 4935 } 4936 /* if AUTH skipped, see if it verified... */ 4937 if (auth_skipped) { 4938 got_auth = 1; 4939 auth_skipped = 0; 4940 } 4941 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4942 /* 4943 * Restart the timer if we have 4944 * pending data 4945 */ 4946 struct sctp_tmit_chunk *chk; 4947 4948 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4949 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4950 } 4951 } 4952 break; 4953 case SCTP_COOKIE_ACK: 4954 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4955 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4956 if (locked_tcb) { 4957 SCTP_TCB_UNLOCK(locked_tcb); 4958 } 4959 return (NULL); 4960 } 4961 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4962 /* We are not interested anymore */ 4963 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4964 ; 4965 } else if (stcb) { 4966 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4967 so = SCTP_INP_SO(inp); 4968 atomic_add_int(&stcb->asoc.refcnt, 1); 4969 SCTP_TCB_UNLOCK(stcb); 4970 SCTP_SOCKET_LOCK(so, 1); 4971 SCTP_TCB_LOCK(stcb); 4972 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4973 #endif 4974 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4975 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4976 SCTP_SOCKET_UNLOCK(so, 1); 4977 #endif 4978 *offset = length; 4979 return (NULL); 4980 } 4981 } 4982 /* He's alive so give him credit */ 4983 if ((stcb) && netp && *netp) { 4984 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4985 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4986 stcb->asoc.overall_error_count, 4987 0, 4988 SCTP_FROM_SCTP_INPUT, 4989 __LINE__); 4990 } 4991 stcb->asoc.overall_error_count = 0; 4992 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4993 } 4994 break; 4995 case SCTP_ECN_ECHO: 4996 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4997 /* He's alive so give him credit */ 4998 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4999 /* Its not ours */ 5000 if (locked_tcb) { 5001 SCTP_TCB_UNLOCK(locked_tcb); 5002 } 5003 *offset = length; 5004 return (NULL); 5005 } 5006 if (stcb) { 5007 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5008 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5009 stcb->asoc.overall_error_count, 5010 0, 5011 SCTP_FROM_SCTP_INPUT, 5012 __LINE__); 5013 } 5014 stcb->asoc.overall_error_count = 0; 5015 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5016 stcb); 5017 } 5018 break; 5019 case SCTP_ECN_CWR: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5021 /* He's alive so give him credit */ 5022 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5023 /* Its not ours */ 5024 if (locked_tcb) { 5025 SCTP_TCB_UNLOCK(locked_tcb); 5026 } 5027 *offset = length; 5028 return (NULL); 5029 } 5030 if (stcb) { 5031 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5032 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5033 stcb->asoc.overall_error_count, 5034 0, 5035 SCTP_FROM_SCTP_INPUT, 5036 __LINE__); 5037 } 5038 stcb->asoc.overall_error_count = 0; 5039 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5040 } 5041 break; 5042 case SCTP_SHUTDOWN_COMPLETE: 5043 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5044 /* must be first and only chunk */ 5045 if ((num_chunks > 1) || 5046 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5047 *offset = length; 5048 if (locked_tcb) { 5049 SCTP_TCB_UNLOCK(locked_tcb); 5050 } 5051 return (NULL); 5052 } 5053 if ((stcb) && netp && *netp) { 5054 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5055 stcb, *netp); 5056 } 5057 *offset = length; 5058 return (NULL); 5059 break; 5060 case SCTP_ASCONF: 5061 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5062 /* He's alive so give him credit */ 5063 if (stcb) { 5064 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5065 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5066 stcb->asoc.overall_error_count, 5067 0, 5068 SCTP_FROM_SCTP_INPUT, 5069 __LINE__); 5070 } 5071 stcb->asoc.overall_error_count = 0; 5072 sctp_handle_asconf(m, *offset, 5073 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5074 asconf_cnt++; 5075 } 5076 break; 5077 case SCTP_ASCONF_ACK: 5078 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5079 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5080 /* Its not ours */ 5081 if (locked_tcb) { 5082 SCTP_TCB_UNLOCK(locked_tcb); 5083 } 5084 *offset = length; 5085 return (NULL); 5086 } 5087 if ((stcb) && netp && *netp) { 5088 /* He's alive so give him credit */ 5089 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5090 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5091 stcb->asoc.overall_error_count, 5092 0, 5093 SCTP_FROM_SCTP_INPUT, 5094 __LINE__); 5095 } 5096 stcb->asoc.overall_error_count = 0; 5097 sctp_handle_asconf_ack(m, *offset, 5098 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5099 if (abort_no_unlock) 5100 return (NULL); 5101 } 5102 break; 5103 case SCTP_FORWARD_CUM_TSN: 5104 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5105 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5106 /* Its not ours */ 5107 if (locked_tcb) { 5108 SCTP_TCB_UNLOCK(locked_tcb); 5109 } 5110 *offset = length; 5111 return (NULL); 5112 } 5113 /* He's alive so give him credit */ 5114 if (stcb) { 5115 int abort_flag = 0; 5116 5117 stcb->asoc.overall_error_count = 0; 5118 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5119 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5120 stcb->asoc.overall_error_count, 5121 0, 5122 SCTP_FROM_SCTP_INPUT, 5123 __LINE__); 5124 } 5125 *fwd_tsn_seen = 1; 5126 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5127 /* We are not interested anymore */ 5128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5129 so = SCTP_INP_SO(inp); 5130 atomic_add_int(&stcb->asoc.refcnt, 1); 5131 SCTP_TCB_UNLOCK(stcb); 5132 SCTP_SOCKET_LOCK(so, 1); 5133 SCTP_TCB_LOCK(stcb); 5134 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5135 #endif 5136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5137 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5138 SCTP_SOCKET_UNLOCK(so, 1); 5139 #endif 5140 *offset = length; 5141 return (NULL); 5142 } 5143 sctp_handle_forward_tsn(stcb, 5144 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5145 if (abort_flag) { 5146 *offset = length; 5147 return (NULL); 5148 } else { 5149 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5150 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5151 stcb->asoc.overall_error_count, 5152 0, 5153 SCTP_FROM_SCTP_INPUT, 5154 __LINE__); 5155 } 5156 stcb->asoc.overall_error_count = 0; 5157 } 5158 5159 } 5160 break; 5161 case SCTP_STREAM_RESET: 5162 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5163 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5164 /* Its not ours */ 5165 if (locked_tcb) { 5166 SCTP_TCB_UNLOCK(locked_tcb); 5167 } 5168 *offset = length; 5169 return (NULL); 5170 } 5171 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5172 /* We are not interested anymore */ 5173 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5174 so = SCTP_INP_SO(inp); 5175 atomic_add_int(&stcb->asoc.refcnt, 1); 5176 SCTP_TCB_UNLOCK(stcb); 5177 SCTP_SOCKET_LOCK(so, 1); 5178 SCTP_TCB_LOCK(stcb); 5179 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5180 #endif 5181 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5182 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5183 SCTP_SOCKET_UNLOCK(so, 1); 5184 #endif 5185 *offset = length; 5186 return (NULL); 5187 } 5188 if (stcb->asoc.peer_supports_strreset == 0) { 5189 /* 5190 * hmm, peer should have announced this, but 5191 * we will turn it on since he is sending us 5192 * a stream reset. 5193 */ 5194 stcb->asoc.peer_supports_strreset = 1; 5195 } 5196 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5197 /* stop processing */ 5198 *offset = length; 5199 return (NULL); 5200 } 5201 break; 5202 case SCTP_PACKET_DROPPED: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5204 /* re-get it all please */ 5205 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5206 /* Its not ours */ 5207 if (locked_tcb) { 5208 SCTP_TCB_UNLOCK(locked_tcb); 5209 } 5210 *offset = length; 5211 return (NULL); 5212 } 5213 if (ch && (stcb) && netp && (*netp)) { 5214 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5215 stcb, *netp, 5216 min(chk_length, (sizeof(chunk_buf) - 4))); 5217 5218 } 5219 break; 5220 5221 case SCTP_AUTHENTICATION: 5222 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5223 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5224 goto unknown_chunk; 5225 5226 if (stcb == NULL) { 5227 /* save the first AUTH for later processing */ 5228 if (auth_skipped == 0) { 5229 auth_offset = *offset; 5230 auth_len = chk_length; 5231 auth_skipped = 1; 5232 } 5233 /* skip this chunk (temporarily) */ 5234 goto next_chunk; 5235 } 5236 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5237 (chk_length > (sizeof(struct sctp_auth_chunk) + 5238 SCTP_AUTH_DIGEST_LEN_MAX))) { 5239 /* Its not ours */ 5240 if (locked_tcb) { 5241 SCTP_TCB_UNLOCK(locked_tcb); 5242 } 5243 *offset = length; 5244 return (NULL); 5245 } 5246 if (got_auth == 1) { 5247 /* skip this chunk... it's already auth'd */ 5248 goto next_chunk; 5249 } 5250 got_auth = 1; 5251 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5252 m, *offset)) { 5253 /* auth HMAC failed so dump the packet */ 5254 *offset = length; 5255 return (stcb); 5256 } else { 5257 /* remaining chunks are HMAC checked */ 5258 stcb->asoc.authenticated = 1; 5259 } 5260 break; 5261 5262 default: 5263 unknown_chunk: 5264 /* it's an unknown chunk! */ 5265 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5266 struct mbuf *mm; 5267 struct sctp_paramhdr *phd; 5268 5269 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5270 0, M_DONTWAIT, 1, MT_DATA); 5271 if (mm) { 5272 phd = mtod(mm, struct sctp_paramhdr *); 5273 /* 5274 * We cheat and use param type since 5275 * we did not bother to define a 5276 * error cause struct. They are the 5277 * same basic format with different 5278 * names. 5279 */ 5280 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5281 phd->param_length = htons(chk_length + sizeof(*phd)); 5282 SCTP_BUF_LEN(mm) = sizeof(*phd); 5283 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5284 M_DONTWAIT); 5285 if (SCTP_BUF_NEXT(mm)) { 5286 #ifdef SCTP_MBUF_LOGGING 5287 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5288 struct mbuf *mat; 5289 5290 mat = SCTP_BUF_NEXT(mm); 5291 while (mat) { 5292 if (SCTP_BUF_IS_EXTENDED(mat)) { 5293 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5294 } 5295 mat = SCTP_BUF_NEXT(mat); 5296 } 5297 } 5298 #endif 5299 sctp_queue_op_err(stcb, mm); 5300 } else { 5301 sctp_m_freem(mm); 5302 } 5303 } 5304 } 5305 if ((ch->chunk_type & 0x80) == 0) { 5306 /* discard this packet */ 5307 *offset = length; 5308 return (stcb); 5309 } /* else skip this bad chunk and continue... */ 5310 break; 5311 } /* switch (ch->chunk_type) */ 5312 5313 5314 next_chunk: 5315 /* get the next chunk */ 5316 *offset += SCTP_SIZE32(chk_length); 5317 if (*offset >= length) { 5318 /* no more data left in the mbuf chain */ 5319 break; 5320 } 5321 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5322 sizeof(struct sctp_chunkhdr), chunk_buf); 5323 if (ch == NULL) { 5324 if (locked_tcb) { 5325 SCTP_TCB_UNLOCK(locked_tcb); 5326 } 5327 *offset = length; 5328 return (NULL); 5329 } 5330 } /* while */ 5331 5332 if (asconf_cnt > 0 && stcb != NULL) { 5333 sctp_send_asconf_ack(stcb); 5334 } 5335 return (stcb); 5336 } 5337 5338 5339 /* 5340 * Process the ECN bits we have something set so we must look to see if it is 5341 * ECN(0) or ECN(1) or CE 5342 */ 5343 static void 5344 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5345 uint8_t ecn_bits) 5346 { 5347 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5348 ; 5349 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5350 /* 5351 * we only add to the nonce sum for ECT1, ECT0 does not 5352 * change the NS bit (that we have yet to find a way to send 5353 * it yet). 5354 */ 5355 5356 /* ECN Nonce stuff */ 5357 stcb->asoc.receiver_nonce_sum++; 5358 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5359 5360 /* 5361 * Drag up the last_echo point if cumack is larger since we 5362 * don't want the point falling way behind by more than 5363 * 2^^31 and then having it be incorrect. 5364 */ 5365 if (SCTP_TSN_GT(stcb->asoc.cumulative_tsn, stcb->asoc.last_echo_tsn)) { 5366 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5367 } 5368 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5369 /* 5370 * Drag up the last_echo point if cumack is larger since we 5371 * don't want the point falling way behind by more than 5372 * 2^^31 and then having it be incorrect. 5373 */ 5374 if (SCTP_TSN_GT(stcb->asoc.cumulative_tsn, stcb->asoc.last_echo_tsn)) { 5375 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5376 } 5377 } 5378 } 5379 5380 static void 5381 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5382 uint32_t high_tsn, uint8_t ecn_bits) 5383 { 5384 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5385 /* 5386 * we possibly must notify the sender that a congestion 5387 * window reduction is in order. We do this by adding a ECNE 5388 * chunk to the output chunk queue. The incoming CWR will 5389 * remove this chunk. 5390 */ 5391 if (SCTP_TSN_GT(high_tsn, stcb->asoc.last_echo_tsn)) { 5392 /* Yep, we need to add a ECNE */ 5393 sctp_send_ecn_echo(stcb, net, high_tsn); 5394 stcb->asoc.last_echo_tsn = high_tsn; 5395 } 5396 } 5397 } 5398 5399 #ifdef INVARIANTS 5400 #ifdef __GNUC__ 5401 __attribute__((noinline)) 5402 #endif 5403 void 5404 sctp_validate_no_locks(struct sctp_inpcb *inp) 5405 { 5406 struct sctp_tcb *lstcb; 5407 5408 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5409 if (mtx_owned(&lstcb->tcb_mtx)) { 5410 panic("Own lock on stcb at return from input"); 5411 } 5412 } 5413 if (mtx_owned(&inp->inp_create_mtx)) { 5414 panic("Own create lock on inp"); 5415 } 5416 if (mtx_owned(&inp->inp_mtx)) { 5417 panic("Own inp lock on inp"); 5418 } 5419 } 5420 5421 #endif 5422 5423 /* 5424 * common input chunk processing (v4 and v6) 5425 */ 5426 void 5427 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5428 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5429 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5430 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5431 { 5432 /* 5433 * Control chunk processing 5434 */ 5435 uint32_t high_tsn; 5436 int fwd_tsn_seen = 0, data_processed = 0; 5437 struct mbuf *m = *mm; 5438 int abort_flag = 0; 5439 int un_sent; 5440 5441 SCTP_STAT_INCR(sctps_recvdatagrams); 5442 #ifdef SCTP_AUDITING_ENABLED 5443 sctp_audit_log(0xE0, 1); 5444 sctp_auditing(0, inp, stcb, net); 5445 #endif 5446 5447 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5448 m, iphlen, offset, length, stcb); 5449 if (stcb) { 5450 /* always clear this before beginning a packet */ 5451 stcb->asoc.authenticated = 0; 5452 stcb->asoc.seen_a_sack_this_pkt = 0; 5453 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5454 stcb, stcb->asoc.state); 5455 5456 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5457 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5458 /*- 5459 * If we hit here, we had a ref count 5460 * up when the assoc was aborted and the 5461 * timer is clearing out the assoc, we should 5462 * NOT respond to any packet.. its OOTB. 5463 */ 5464 SCTP_TCB_UNLOCK(stcb); 5465 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5466 vrf_id, port); 5467 goto out_now; 5468 } 5469 } 5470 if (IS_SCTP_CONTROL(ch)) { 5471 /* process the control portion of the SCTP packet */ 5472 /* sa_ignore NO_NULL_CHK */ 5473 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5474 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5475 if (stcb) { 5476 /* 5477 * This covers us if the cookie-echo was there and 5478 * it changes our INP. 5479 */ 5480 inp = stcb->sctp_ep; 5481 if ((net) && (port)) { 5482 if (net->port == 0) { 5483 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5484 } 5485 net->port = port; 5486 } 5487 } 5488 } else { 5489 /* 5490 * no control chunks, so pre-process DATA chunks (these 5491 * checks are taken care of by control processing) 5492 */ 5493 5494 /* 5495 * if DATA only packet, and auth is required, then punt... 5496 * can't have authenticated without any AUTH (control) 5497 * chunks 5498 */ 5499 if ((stcb != NULL) && 5500 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5501 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5502 /* "silently" ignore */ 5503 SCTP_STAT_INCR(sctps_recvauthmissing); 5504 SCTP_TCB_UNLOCK(stcb); 5505 goto out_now; 5506 } 5507 if (stcb == NULL) { 5508 /* out of the blue DATA chunk */ 5509 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5510 vrf_id, port); 5511 goto out_now; 5512 } 5513 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5514 /* v_tag mismatch! */ 5515 SCTP_STAT_INCR(sctps_badvtag); 5516 SCTP_TCB_UNLOCK(stcb); 5517 goto out_now; 5518 } 5519 } 5520 5521 if (stcb == NULL) { 5522 /* 5523 * no valid TCB for this packet, or we found it's a bad 5524 * packet while processing control, or we're done with this 5525 * packet (done or skip rest of data), so we drop it... 5526 */ 5527 goto out_now; 5528 } 5529 /* 5530 * DATA chunk processing 5531 */ 5532 /* plow through the data chunks while length > offset */ 5533 5534 /* 5535 * Rest should be DATA only. Check authentication state if AUTH for 5536 * DATA is required. 5537 */ 5538 if ((length > offset) && 5539 (stcb != NULL) && 5540 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5541 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5542 !stcb->asoc.authenticated) { 5543 /* "silently" ignore */ 5544 SCTP_STAT_INCR(sctps_recvauthmissing); 5545 SCTPDBG(SCTP_DEBUG_AUTH1, 5546 "Data chunk requires AUTH, skipped\n"); 5547 goto trigger_send; 5548 } 5549 if (length > offset) { 5550 int retval; 5551 5552 /* 5553 * First check to make sure our state is correct. We would 5554 * not get here unless we really did have a tag, so we don't 5555 * abort if this happens, just dump the chunk silently. 5556 */ 5557 switch (SCTP_GET_STATE(&stcb->asoc)) { 5558 case SCTP_STATE_COOKIE_ECHOED: 5559 /* 5560 * we consider data with valid tags in this state 5561 * shows us the cookie-ack was lost. Imply it was 5562 * there. 5563 */ 5564 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5565 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5566 stcb->asoc.overall_error_count, 5567 0, 5568 SCTP_FROM_SCTP_INPUT, 5569 __LINE__); 5570 } 5571 stcb->asoc.overall_error_count = 0; 5572 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5573 break; 5574 case SCTP_STATE_COOKIE_WAIT: 5575 /* 5576 * We consider OOTB any data sent during asoc setup. 5577 */ 5578 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5579 vrf_id, port); 5580 SCTP_TCB_UNLOCK(stcb); 5581 goto out_now; 5582 /* sa_ignore NOTREACHED */ 5583 break; 5584 case SCTP_STATE_EMPTY: /* should not happen */ 5585 case SCTP_STATE_INUSE: /* should not happen */ 5586 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5587 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5588 default: 5589 SCTP_TCB_UNLOCK(stcb); 5590 goto out_now; 5591 /* sa_ignore NOTREACHED */ 5592 break; 5593 case SCTP_STATE_OPEN: 5594 case SCTP_STATE_SHUTDOWN_SENT: 5595 break; 5596 } 5597 /* take care of ECN, part 1. */ 5598 if (stcb->asoc.ecn_allowed && 5599 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5600 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5601 } 5602 /* plow through the data chunks while length > offset */ 5603 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5604 inp, stcb, net, &high_tsn); 5605 if (retval == 2) { 5606 /* 5607 * The association aborted, NO UNLOCK needed since 5608 * the association is destroyed. 5609 */ 5610 goto out_now; 5611 } 5612 data_processed = 1; 5613 if (retval == 0) { 5614 /* take care of ecn part 2. */ 5615 if (stcb->asoc.ecn_allowed && 5616 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5617 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5618 ecn_bits); 5619 } 5620 } 5621 /* 5622 * Anything important needs to have been m_copy'ed in 5623 * process_data 5624 */ 5625 } 5626 if ((data_processed == 0) && (fwd_tsn_seen)) { 5627 int was_a_gap; 5628 uint32_t highest_tsn; 5629 5630 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5631 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5632 } else { 5633 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5634 } 5635 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5636 stcb->asoc.send_sack = 1; 5637 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5638 if (abort_flag) { 5639 /* Again, we aborted so NO UNLOCK needed */ 5640 goto out_now; 5641 } 5642 } else if (fwd_tsn_seen) { 5643 stcb->asoc.send_sack = 1; 5644 } 5645 /* trigger send of any chunks in queue... */ 5646 trigger_send: 5647 #ifdef SCTP_AUDITING_ENABLED 5648 sctp_audit_log(0xE0, 2); 5649 sctp_auditing(1, inp, stcb, net); 5650 #endif 5651 SCTPDBG(SCTP_DEBUG_INPUT1, 5652 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5653 stcb->asoc.peers_rwnd, 5654 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5655 stcb->asoc.total_flight); 5656 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5657 5658 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5659 ((un_sent) && 5660 (stcb->asoc.peers_rwnd > 0 || 5661 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5662 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5663 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5664 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5665 } 5666 #ifdef SCTP_AUDITING_ENABLED 5667 sctp_audit_log(0xE0, 3); 5668 sctp_auditing(2, inp, stcb, net); 5669 #endif 5670 SCTP_TCB_UNLOCK(stcb); 5671 out_now: 5672 #ifdef INVARIANTS 5673 sctp_validate_no_locks(inp); 5674 #endif 5675 return; 5676 } 5677 5678 #if 0 5679 static void 5680 sctp_print_mbuf_chain(struct mbuf *m) 5681 { 5682 for (; m; m = SCTP_BUF_NEXT(m)) { 5683 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5684 if (SCTP_BUF_IS_EXTENDED(m)) 5685 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5686 } 5687 } 5688 5689 #endif 5690 5691 void 5692 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5693 { 5694 #ifdef SCTP_MBUF_LOGGING 5695 struct mbuf *mat; 5696 5697 #endif 5698 struct mbuf *m; 5699 int iphlen; 5700 uint32_t vrf_id = 0; 5701 uint8_t ecn_bits; 5702 struct ip *ip; 5703 struct sctphdr *sh; 5704 struct sctp_inpcb *inp = NULL; 5705 struct sctp_nets *net; 5706 struct sctp_tcb *stcb = NULL; 5707 struct sctp_chunkhdr *ch; 5708 int refcount_up = 0; 5709 int length, mlen, offset; 5710 5711 #if !defined(SCTP_WITH_NO_CSUM) 5712 uint32_t check, calc_check; 5713 5714 #endif 5715 5716 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5717 SCTP_RELEASE_PKT(i_pak); 5718 return; 5719 } 5720 mlen = SCTP_HEADER_LEN(i_pak); 5721 iphlen = off; 5722 m = SCTP_HEADER_TO_CHAIN(i_pak); 5723 5724 net = NULL; 5725 SCTP_STAT_INCR(sctps_recvpackets); 5726 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5727 5728 5729 #ifdef SCTP_MBUF_LOGGING 5730 /* Log in any input mbufs */ 5731 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5732 mat = m; 5733 while (mat) { 5734 if (SCTP_BUF_IS_EXTENDED(mat)) { 5735 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5736 } 5737 mat = SCTP_BUF_NEXT(mat); 5738 } 5739 } 5740 #endif 5741 #ifdef SCTP_PACKET_LOGGING 5742 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5743 sctp_packet_log(m, mlen); 5744 #endif 5745 /* 5746 * Must take out the iphlen, since mlen expects this (only effect lb 5747 * case) 5748 */ 5749 mlen -= iphlen; 5750 5751 /* 5752 * Get IP, SCTP, and first chunk header together in first mbuf. 5753 */ 5754 ip = mtod(m, struct ip *); 5755 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5756 if (SCTP_BUF_LEN(m) < offset) { 5757 if ((m = m_pullup(m, offset)) == 0) { 5758 SCTP_STAT_INCR(sctps_hdrops); 5759 return; 5760 } 5761 ip = mtod(m, struct ip *); 5762 } 5763 /* validate mbuf chain length with IP payload length */ 5764 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5765 SCTP_STAT_INCR(sctps_hdrops); 5766 goto bad; 5767 } 5768 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5769 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5770 SCTPDBG(SCTP_DEBUG_INPUT1, 5771 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5772 5773 /* SCTP does not allow broadcasts or multicasts */ 5774 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5775 goto bad; 5776 } 5777 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5778 /* 5779 * We only look at broadcast if its a front state, All 5780 * others we will not have a tcb for anyway. 5781 */ 5782 goto bad; 5783 } 5784 /* validate SCTP checksum */ 5785 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5786 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5787 m->m_pkthdr.len, 5788 if_name(m->m_pkthdr.rcvif), 5789 m->m_pkthdr.csum_flags); 5790 #if defined(SCTP_WITH_NO_CSUM) 5791 SCTP_STAT_INCR(sctps_recvnocrc); 5792 #else 5793 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5794 SCTP_STAT_INCR(sctps_recvhwcrc); 5795 goto sctp_skip_csum_4; 5796 } 5797 check = sh->checksum; /* save incoming checksum */ 5798 sh->checksum = 0; /* prepare for calc */ 5799 calc_check = sctp_calculate_cksum(m, iphlen); 5800 sh->checksum = check; 5801 SCTP_STAT_INCR(sctps_recvswcrc); 5802 if (calc_check != check) { 5803 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5804 calc_check, check, m, mlen, iphlen); 5805 5806 stcb = sctp_findassociation_addr(m, iphlen, 5807 offset - sizeof(*ch), 5808 sh, ch, &inp, &net, 5809 vrf_id); 5810 if ((net) && (port)) { 5811 if (net->port == 0) { 5812 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5813 } 5814 net->port = port; 5815 } 5816 if ((inp) && (stcb)) { 5817 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5818 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5819 } else if ((inp != NULL) && (stcb == NULL)) { 5820 refcount_up = 1; 5821 } 5822 SCTP_STAT_INCR(sctps_badsum); 5823 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5824 goto bad; 5825 } 5826 sctp_skip_csum_4: 5827 #endif 5828 /* destination port of 0 is illegal, based on RFC2960. */ 5829 if (sh->dest_port == 0) { 5830 SCTP_STAT_INCR(sctps_hdrops); 5831 goto bad; 5832 } 5833 /* 5834 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5835 * IP/SCTP/first chunk header... 5836 */ 5837 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5838 sh, ch, &inp, &net, vrf_id); 5839 if ((net) && (port)) { 5840 if (net->port == 0) { 5841 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5842 } 5843 net->port = port; 5844 } 5845 /* inp's ref-count increased && stcb locked */ 5846 if (inp == NULL) { 5847 struct sctp_init_chunk *init_chk, chunk_buf; 5848 5849 SCTP_STAT_INCR(sctps_noport); 5850 #ifdef ICMP_BANDLIM 5851 /* 5852 * we use the bandwidth limiting to protect against sending 5853 * too many ABORTS all at once. In this case these count the 5854 * same as an ICMP message. 5855 */ 5856 if (badport_bandlim(0) < 0) 5857 goto bad; 5858 #endif /* ICMP_BANDLIM */ 5859 SCTPDBG(SCTP_DEBUG_INPUT1, 5860 "Sending a ABORT from packet entry!\n"); 5861 if (ch->chunk_type == SCTP_INITIATION) { 5862 /* 5863 * we do a trick here to get the INIT tag, dig in 5864 * and get the tag from the INIT and put it in the 5865 * common header. 5866 */ 5867 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5868 iphlen + sizeof(*sh), sizeof(*init_chk), 5869 (uint8_t *) & chunk_buf); 5870 if (init_chk != NULL) 5871 sh->v_tag = init_chk->init.initiate_tag; 5872 } 5873 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5874 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5875 goto bad; 5876 } 5877 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5878 goto bad; 5879 } 5880 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5881 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5882 goto bad; 5883 } else if (stcb == NULL) { 5884 refcount_up = 1; 5885 } 5886 #ifdef IPSEC 5887 /* 5888 * I very much doubt any of the IPSEC stuff will work but I have no 5889 * idea, so I will leave it in place. 5890 */ 5891 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5892 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5893 SCTP_STAT_INCR(sctps_hdrops); 5894 goto bad; 5895 } 5896 #endif /* IPSEC */ 5897 5898 /* 5899 * common chunk processing 5900 */ 5901 length = ip->ip_len + iphlen; 5902 offset -= sizeof(struct sctp_chunkhdr); 5903 5904 ecn_bits = ip->ip_tos; 5905 5906 /* sa_ignore NO_NULL_CHK */ 5907 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5908 inp, stcb, net, ecn_bits, vrf_id, port); 5909 /* inp's ref-count reduced && stcb unlocked */ 5910 if (m) { 5911 sctp_m_freem(m); 5912 } 5913 if ((inp) && (refcount_up)) { 5914 /* reduce ref-count */ 5915 SCTP_INP_DECR_REF(inp); 5916 } 5917 return; 5918 bad: 5919 if (stcb) { 5920 SCTP_TCB_UNLOCK(stcb); 5921 } 5922 if ((inp) && (refcount_up)) { 5923 /* reduce ref-count */ 5924 SCTP_INP_DECR_REF(inp); 5925 } 5926 if (m) { 5927 sctp_m_freem(m); 5928 } 5929 return; 5930 } 5931 void 5932 sctp_input(i_pak, off) 5933 struct mbuf *i_pak; 5934 int off; 5935 { 5936 sctp_input_with_port(i_pak, off, 0); 5937 } 5938