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 2315 SCTPDBG(SCTP_DEBUG_INPUT2, 2316 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2317 2318 if (inp_p == NULL) { 2319 return (NULL); 2320 } 2321 /* First get the destination address setup too. */ 2322 iph = mtod(m, struct ip *); 2323 switch (iph->ip_v) { 2324 case IPVERSION: 2325 { 2326 /* its IPv4 */ 2327 struct sockaddr_in *lsin; 2328 2329 lsin = (struct sockaddr_in *)(localep_sa); 2330 memset(lsin, 0, sizeof(*lsin)); 2331 lsin->sin_family = AF_INET; 2332 lsin->sin_len = sizeof(*lsin); 2333 lsin->sin_port = sh->dest_port; 2334 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2335 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2336 break; 2337 } 2338 #ifdef INET6 2339 case IPV6_VERSION >> 4: 2340 { 2341 /* its IPv6 */ 2342 struct ip6_hdr *ip6; 2343 struct sockaddr_in6 *lsin6; 2344 2345 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2346 memset(lsin6, 0, sizeof(*lsin6)); 2347 lsin6->sin6_family = AF_INET6; 2348 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2349 ip6 = mtod(m, struct ip6_hdr *); 2350 lsin6->sin6_port = sh->dest_port; 2351 lsin6->sin6_addr = ip6->ip6_dst; 2352 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2353 break; 2354 } 2355 #endif 2356 default: 2357 return (NULL); 2358 } 2359 2360 cookie = &cp->cookie; 2361 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2362 cookie_len = ntohs(cp->ch.chunk_length); 2363 2364 if ((cookie->peerport != sh->src_port) && 2365 (cookie->myport != sh->dest_port) && 2366 (cookie->my_vtag != sh->v_tag)) { 2367 /* 2368 * invalid ports or bad tag. Note that we always leave the 2369 * v_tag in the header in network order and when we stored 2370 * it in the my_vtag slot we also left it in network order. 2371 * This maintains the match even though it may be in the 2372 * opposite byte order of the machine :-> 2373 */ 2374 return (NULL); 2375 } 2376 if (cookie_len > size_of_pkt || 2377 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2378 sizeof(struct sctp_init_chunk) + 2379 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2380 /* cookie too long! or too small */ 2381 return (NULL); 2382 } 2383 /* 2384 * split off the signature into its own mbuf (since it should not be 2385 * calculated in the sctp_hmac_m() call). 2386 */ 2387 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2388 if (sig_offset > size_of_pkt) { 2389 /* packet not correct size! */ 2390 /* XXX this may already be accounted for earlier... */ 2391 return (NULL); 2392 } 2393 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2394 if (m_sig == NULL) { 2395 /* out of memory or ?? */ 2396 return (NULL); 2397 } 2398 #ifdef SCTP_MBUF_LOGGING 2399 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2400 struct mbuf *mat; 2401 2402 mat = m_sig; 2403 while (mat) { 2404 if (SCTP_BUF_IS_EXTENDED(mat)) { 2405 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2406 } 2407 mat = SCTP_BUF_NEXT(mat); 2408 } 2409 } 2410 #endif 2411 2412 /* 2413 * compute the signature/digest for the cookie 2414 */ 2415 ep = &(*inp_p)->sctp_ep; 2416 l_inp = *inp_p; 2417 if (l_stcb) { 2418 SCTP_TCB_UNLOCK(l_stcb); 2419 } 2420 SCTP_INP_RLOCK(l_inp); 2421 if (l_stcb) { 2422 SCTP_TCB_LOCK(l_stcb); 2423 } 2424 /* which cookie is it? */ 2425 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2426 (ep->current_secret_number != ep->last_secret_number)) { 2427 /* it's the old cookie */ 2428 (void)sctp_hmac_m(SCTP_HMAC, 2429 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2430 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2431 } else { 2432 /* it's the current cookie */ 2433 (void)sctp_hmac_m(SCTP_HMAC, 2434 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2435 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2436 } 2437 /* get the signature */ 2438 SCTP_INP_RUNLOCK(l_inp); 2439 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2440 if (sig == NULL) { 2441 /* couldn't find signature */ 2442 sctp_m_freem(m_sig); 2443 return (NULL); 2444 } 2445 /* compare the received digest with the computed digest */ 2446 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2447 /* try the old cookie? */ 2448 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2449 (ep->current_secret_number != ep->last_secret_number)) { 2450 /* compute digest with old */ 2451 (void)sctp_hmac_m(SCTP_HMAC, 2452 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2453 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2454 /* compare */ 2455 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2456 cookie_ok = 1; 2457 } 2458 } else { 2459 cookie_ok = 1; 2460 } 2461 2462 /* 2463 * Now before we continue we must reconstruct our mbuf so that 2464 * normal processing of any other chunks will work. 2465 */ 2466 { 2467 struct mbuf *m_at; 2468 2469 m_at = m; 2470 while (SCTP_BUF_NEXT(m_at) != NULL) { 2471 m_at = SCTP_BUF_NEXT(m_at); 2472 } 2473 SCTP_BUF_NEXT(m_at) = m_sig; 2474 } 2475 2476 if (cookie_ok == 0) { 2477 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2478 SCTPDBG(SCTP_DEBUG_INPUT2, 2479 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2480 (uint32_t) offset, cookie_offset, sig_offset); 2481 return (NULL); 2482 } 2483 /* 2484 * check the cookie timestamps to be sure it's not stale 2485 */ 2486 (void)SCTP_GETTIME_TIMEVAL(&now); 2487 /* Expire time is in Ticks, so we convert to seconds */ 2488 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2489 time_expires.tv_usec = cookie->time_entered.tv_usec; 2490 /* 2491 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2492 * is undefined. 2493 */ 2494 if (timevalcmp(&now, &time_expires, >)) { 2495 /* cookie is stale! */ 2496 struct mbuf *op_err; 2497 struct sctp_stale_cookie_msg *scm; 2498 uint32_t tim; 2499 2500 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2501 0, M_DONTWAIT, 1, MT_DATA); 2502 if (op_err == NULL) { 2503 /* FOOBAR */ 2504 return (NULL); 2505 } 2506 /* Set the len */ 2507 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2508 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2509 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2510 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2511 (sizeof(uint32_t)))); 2512 /* seconds to usec */ 2513 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2514 /* add in usec */ 2515 if (tim == 0) 2516 tim = now.tv_usec - cookie->time_entered.tv_usec; 2517 scm->time_usec = htonl(tim); 2518 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2519 vrf_id, port); 2520 return (NULL); 2521 } 2522 /* 2523 * Now we must see with the lookup address if we have an existing 2524 * asoc. This will only happen if we were in the COOKIE-WAIT state 2525 * and a INIT collided with us and somewhere the peer sent the 2526 * cookie on another address besides the single address our assoc 2527 * had for him. In this case we will have one of the tie-tags set at 2528 * least AND the address field in the cookie can be used to look it 2529 * up. 2530 */ 2531 to = NULL; 2532 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2533 memset(&sin6, 0, sizeof(sin6)); 2534 sin6.sin6_family = AF_INET6; 2535 sin6.sin6_len = sizeof(sin6); 2536 sin6.sin6_port = sh->src_port; 2537 sin6.sin6_scope_id = cookie->scope_id; 2538 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2539 sizeof(sin6.sin6_addr.s6_addr)); 2540 to = (struct sockaddr *)&sin6; 2541 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2542 memset(&sin, 0, sizeof(sin)); 2543 sin.sin_family = AF_INET; 2544 sin.sin_len = sizeof(sin); 2545 sin.sin_port = sh->src_port; 2546 sin.sin_addr.s_addr = cookie->address[0]; 2547 to = (struct sockaddr *)&sin; 2548 } else { 2549 /* This should not happen */ 2550 return (NULL); 2551 } 2552 if ((*stcb == NULL) && to) { 2553 /* Yep, lets check */ 2554 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2555 if (*stcb == NULL) { 2556 /* 2557 * We should have only got back the same inp. If we 2558 * got back a different ep we have a problem. The 2559 * original findep got back l_inp and now 2560 */ 2561 if (l_inp != *inp_p) { 2562 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2563 } 2564 } else { 2565 if (*locked_tcb == NULL) { 2566 /* 2567 * In this case we found the assoc only 2568 * after we locked the create lock. This 2569 * means we are in a colliding case and we 2570 * must make sure that we unlock the tcb if 2571 * its one of the cases where we throw away 2572 * the incoming packets. 2573 */ 2574 *locked_tcb = *stcb; 2575 2576 /* 2577 * We must also increment the inp ref count 2578 * since the ref_count flags was set when we 2579 * did not find the TCB, now we found it 2580 * which reduces the refcount.. we must 2581 * raise it back out to balance it all :-) 2582 */ 2583 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2584 if ((*stcb)->sctp_ep != l_inp) { 2585 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2586 (*stcb)->sctp_ep, l_inp); 2587 } 2588 } 2589 } 2590 } 2591 if (to == NULL) { 2592 return (NULL); 2593 } 2594 cookie_len -= SCTP_SIGNATURE_SIZE; 2595 if (*stcb == NULL) { 2596 /* this is the "normal" case... get a new TCB */ 2597 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2598 cookie_len, *inp_p, netp, to, ¬ification, 2599 auth_skipped, auth_offset, auth_len, vrf_id, port); 2600 } else { 2601 /* this is abnormal... cookie-echo on existing TCB */ 2602 had_a_existing_tcb = 1; 2603 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2604 cookie, cookie_len, *inp_p, *stcb, netp, to, 2605 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2606 } 2607 2608 if (*stcb == NULL) { 2609 /* still no TCB... must be bad cookie-echo */ 2610 return (NULL); 2611 } 2612 /* 2613 * Ok, we built an association so confirm the address we sent the 2614 * INIT-ACK to. 2615 */ 2616 netl = sctp_findnet(*stcb, to); 2617 /* 2618 * This code should in theory NOT run but 2619 */ 2620 if (netl == NULL) { 2621 /* TSNH! Huh, why do I need to add this address here? */ 2622 int ret; 2623 2624 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2625 SCTP_IN_COOKIE_PROC); 2626 netl = sctp_findnet(*stcb, to); 2627 } 2628 if (netl) { 2629 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2630 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2631 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2632 netl); 2633 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2634 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 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 return (m); 2659 } 2660 oso = (*inp_p)->sctp_socket; 2661 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2662 SCTP_TCB_UNLOCK((*stcb)); 2663 so = sonewconn(oso, 0 2664 ); 2665 SCTP_TCB_LOCK((*stcb)); 2666 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2667 2668 if (so == NULL) { 2669 struct mbuf *op_err; 2670 2671 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2672 struct socket *pcb_so; 2673 2674 #endif 2675 /* Too many sockets */ 2676 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2677 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2678 sctp_abort_association(*inp_p, NULL, m, iphlen, 2679 sh, op_err, vrf_id, port); 2680 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2681 pcb_so = SCTP_INP_SO(*inp_p); 2682 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2683 SCTP_TCB_UNLOCK((*stcb)); 2684 SCTP_SOCKET_LOCK(pcb_so, 1); 2685 SCTP_TCB_LOCK((*stcb)); 2686 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2687 #endif 2688 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2689 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2690 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2691 #endif 2692 return (NULL); 2693 } 2694 inp = (struct sctp_inpcb *)so->so_pcb; 2695 SCTP_INP_INCR_REF(inp); 2696 /* 2697 * We add the unbound flag here so that if we get an 2698 * soabort() before we get the move_pcb done, we 2699 * will properly cleanup. 2700 */ 2701 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2702 SCTP_PCB_FLAGS_CONNECTED | 2703 SCTP_PCB_FLAGS_IN_TCPPOOL | 2704 SCTP_PCB_FLAGS_UNBOUND | 2705 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2706 SCTP_PCB_FLAGS_DONT_WAKE); 2707 inp->sctp_features = (*inp_p)->sctp_features; 2708 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2709 inp->sctp_socket = so; 2710 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2711 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2712 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2713 inp->sctp_context = (*inp_p)->sctp_context; 2714 inp->inp_starting_point_for_iterator = NULL; 2715 /* 2716 * copy in the authentication parameters from the 2717 * original endpoint 2718 */ 2719 if (inp->sctp_ep.local_hmacs) 2720 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2721 inp->sctp_ep.local_hmacs = 2722 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2723 if (inp->sctp_ep.local_auth_chunks) 2724 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2725 inp->sctp_ep.local_auth_chunks = 2726 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2727 2728 /* 2729 * Now we must move it from one hash table to 2730 * another and get the tcb in the right place. 2731 */ 2732 2733 /* 2734 * This is where the one-2-one socket is put into 2735 * the accept state waiting for the accept! 2736 */ 2737 if (*stcb) { 2738 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2739 } 2740 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2741 2742 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2743 SCTP_TCB_UNLOCK((*stcb)); 2744 2745 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2746 0); 2747 SCTP_TCB_LOCK((*stcb)); 2748 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2749 2750 2751 /* 2752 * now we must check to see if we were aborted while 2753 * the move was going on and the lock/unlock 2754 * happened. 2755 */ 2756 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2757 /* 2758 * yep it was, we leave the assoc attached 2759 * to the socket since the sctp_inpcb_free() 2760 * call will send an abort for us. 2761 */ 2762 SCTP_INP_DECR_REF(inp); 2763 return (NULL); 2764 } 2765 SCTP_INP_DECR_REF(inp); 2766 /* Switch over to the new guy */ 2767 *inp_p = inp; 2768 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2769 2770 /* 2771 * Pull it from the incomplete queue and wake the 2772 * guy 2773 */ 2774 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2775 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2776 SCTP_TCB_UNLOCK((*stcb)); 2777 SCTP_SOCKET_LOCK(so, 1); 2778 #endif 2779 soisconnected(so); 2780 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2781 SCTP_TCB_LOCK((*stcb)); 2782 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2783 SCTP_SOCKET_UNLOCK(so, 1); 2784 #endif 2785 return (m); 2786 } 2787 } 2788 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2789 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2790 } 2791 return (m); 2792 } 2793 2794 static void 2795 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2796 struct sctp_tcb *stcb, struct sctp_nets *net) 2797 { 2798 /* cp must not be used, others call this without a c-ack :-) */ 2799 struct sctp_association *asoc; 2800 2801 SCTPDBG(SCTP_DEBUG_INPUT2, 2802 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2803 if (stcb == NULL) 2804 return; 2805 2806 asoc = &stcb->asoc; 2807 2808 sctp_stop_all_cookie_timers(stcb); 2809 /* process according to association state */ 2810 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2811 /* state change only needed when I am in right state */ 2812 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2813 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2814 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2815 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2816 stcb->sctp_ep, stcb, asoc->primary_destination); 2817 2818 } 2819 /* update RTO */ 2820 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2821 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2822 if (asoc->overall_error_count == 0) { 2823 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2824 &asoc->time_entered, sctp_align_safe_nocopy); 2825 } 2826 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2827 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2828 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2829 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2830 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2831 struct socket *so; 2832 2833 #endif 2834 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2835 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2836 so = SCTP_INP_SO(stcb->sctp_ep); 2837 atomic_add_int(&stcb->asoc.refcnt, 1); 2838 SCTP_TCB_UNLOCK(stcb); 2839 SCTP_SOCKET_LOCK(so, 1); 2840 SCTP_TCB_LOCK(stcb); 2841 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2842 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2843 SCTP_SOCKET_UNLOCK(so, 1); 2844 return; 2845 } 2846 #endif 2847 soisconnected(stcb->sctp_socket); 2848 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2849 SCTP_SOCKET_UNLOCK(so, 1); 2850 #endif 2851 } 2852 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2853 stcb, net); 2854 /* 2855 * since we did not send a HB make sure we don't double 2856 * things 2857 */ 2858 net->hb_responded = 1; 2859 2860 if (stcb->asoc.sctp_autoclose_ticks && 2861 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2862 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2863 stcb->sctp_ep, stcb, NULL); 2864 } 2865 /* 2866 * send ASCONF if parameters are pending and ASCONFs are 2867 * allowed (eg. addresses changed when init/cookie echo were 2868 * in flight) 2869 */ 2870 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2871 (stcb->asoc.peer_supports_asconf) && 2872 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2873 #ifdef SCTP_TIMER_BASED_ASCONF 2874 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2875 stcb->sctp_ep, stcb, 2876 stcb->asoc.primary_destination); 2877 #else 2878 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2879 SCTP_ADDR_NOT_LOCKED); 2880 #endif 2881 } 2882 } 2883 /* Toss the cookie if I can */ 2884 sctp_toss_old_cookies(stcb, asoc); 2885 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2886 /* Restart the timer if we have pending data */ 2887 struct sctp_tmit_chunk *chk; 2888 2889 chk = TAILQ_FIRST(&asoc->sent_queue); 2890 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2891 } 2892 } 2893 2894 static void 2895 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2896 struct sctp_tcb *stcb) 2897 { 2898 struct sctp_nets *net; 2899 struct sctp_tmit_chunk *lchk; 2900 uint32_t tsn; 2901 2902 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2903 return; 2904 } 2905 SCTP_STAT_INCR(sctps_recvecne); 2906 tsn = ntohl(cp->tsn); 2907 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2908 /* Also we make sure we disable the nonce_wait */ 2909 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2910 if (lchk == NULL) { 2911 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2912 } else { 2913 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2914 } 2915 stcb->asoc.nonce_wait_for_ecne = 0; 2916 stcb->asoc.nonce_sum_check = 0; 2917 2918 /* Find where it was sent, if possible */ 2919 net = NULL; 2920 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2921 if (lchk->rec.data.TSN_seq == tsn) { 2922 net = lchk->whoTo; 2923 break; 2924 } 2925 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 2926 break; 2927 } 2928 } 2929 if (net == NULL) 2930 /* default is we use the primary */ 2931 net = stcb->asoc.primary_destination; 2932 2933 if (SCTP_TSN_GT(tsn, stcb->asoc.last_cwr_tsn)) { 2934 /* 2935 * JRS - Use the congestion control given in the pluggable 2936 * CC module 2937 */ 2938 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2939 /* 2940 * we reduce once every RTT. So we will only lower cwnd at 2941 * the next sending seq i.e. the resync_tsn. 2942 */ 2943 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2944 } 2945 /* 2946 * We always send a CWR this way if our previous one was lost our 2947 * peer will get an update, or if it is not time again to reduce we 2948 * still get the cwr to the peer. 2949 */ 2950 sctp_send_cwr(stcb, net, tsn); 2951 } 2952 2953 static void 2954 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2955 { 2956 /* 2957 * Here we get a CWR from the peer. We must look in the outqueue and 2958 * make sure that we have a covered ECNE in teh control chunk part. 2959 * If so remove it. 2960 */ 2961 struct sctp_tmit_chunk *chk; 2962 struct sctp_ecne_chunk *ecne; 2963 2964 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2965 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2966 continue; 2967 } 2968 /* 2969 * Look for and remove if it is the right TSN. Since there 2970 * is only ONE ECNE on the control queue at any one time we 2971 * don't need to worry about more than one! 2972 */ 2973 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2974 if (SCTP_TSN_GE(ntohl(cp->tsn), ntohl(ecne->tsn))) { 2975 /* this covers this ECNE, we can remove it */ 2976 stcb->asoc.ecn_echo_cnt_onq--; 2977 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2978 sctp_next); 2979 if (chk->data) { 2980 sctp_m_freem(chk->data); 2981 chk->data = NULL; 2982 } 2983 stcb->asoc.ctrl_queue_cnt--; 2984 sctp_free_a_chunk(stcb, chk); 2985 break; 2986 } 2987 } 2988 } 2989 2990 static void 2991 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2992 struct sctp_tcb *stcb, struct sctp_nets *net) 2993 { 2994 struct sctp_association *asoc; 2995 2996 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2997 struct socket *so; 2998 2999 #endif 3000 3001 SCTPDBG(SCTP_DEBUG_INPUT2, 3002 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3003 if (stcb == NULL) 3004 return; 3005 3006 asoc = &stcb->asoc; 3007 /* process according to association state */ 3008 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3009 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3010 SCTPDBG(SCTP_DEBUG_INPUT2, 3011 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3012 SCTP_TCB_UNLOCK(stcb); 3013 return; 3014 } 3015 /* notify upper layer protocol */ 3016 if (stcb->sctp_socket) { 3017 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3018 /* are the queues empty? they should be */ 3019 if (!TAILQ_EMPTY(&asoc->send_queue) || 3020 !TAILQ_EMPTY(&asoc->sent_queue) || 3021 !TAILQ_EMPTY(&asoc->out_wheel)) { 3022 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3023 } 3024 } 3025 /* stop the timer */ 3026 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3027 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3028 /* free the TCB */ 3029 SCTPDBG(SCTP_DEBUG_INPUT2, 3030 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3031 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3032 so = SCTP_INP_SO(stcb->sctp_ep); 3033 atomic_add_int(&stcb->asoc.refcnt, 1); 3034 SCTP_TCB_UNLOCK(stcb); 3035 SCTP_SOCKET_LOCK(so, 1); 3036 SCTP_TCB_LOCK(stcb); 3037 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3038 #endif 3039 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3040 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3041 SCTP_SOCKET_UNLOCK(so, 1); 3042 #endif 3043 return; 3044 } 3045 3046 static int 3047 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3048 struct sctp_nets *net, uint8_t flg) 3049 { 3050 switch (desc->chunk_type) { 3051 case SCTP_DATA: 3052 /* find the tsn to resend (possibly */ 3053 { 3054 uint32_t tsn; 3055 struct sctp_tmit_chunk *tp1; 3056 3057 tsn = ntohl(desc->tsn_ifany); 3058 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3059 if (tp1->rec.data.TSN_seq == tsn) { 3060 /* found it */ 3061 break; 3062 } 3063 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3064 /* not found */ 3065 tp1 = NULL; 3066 break; 3067 } 3068 } 3069 if (tp1 == NULL) { 3070 /* 3071 * Do it the other way , aka without paying 3072 * attention to queue seq order. 3073 */ 3074 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3075 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3076 if (tp1->rec.data.TSN_seq == tsn) { 3077 /* found it */ 3078 break; 3079 } 3080 } 3081 } 3082 if (tp1 == NULL) { 3083 SCTP_STAT_INCR(sctps_pdrptsnnf); 3084 } 3085 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3086 uint8_t *ddp; 3087 3088 if (((flg & SCTP_BADCRC) == 0) && 3089 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3090 return (0); 3091 } 3092 if ((stcb->asoc.peers_rwnd == 0) && 3093 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3094 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3095 return (0); 3096 } 3097 if (stcb->asoc.peers_rwnd == 0 && 3098 (flg & SCTP_FROM_MIDDLE_BOX)) { 3099 SCTP_STAT_INCR(sctps_pdrpdizrw); 3100 return (0); 3101 } 3102 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3103 sizeof(struct sctp_data_chunk)); 3104 { 3105 unsigned int iii; 3106 3107 for (iii = 0; iii < sizeof(desc->data_bytes); 3108 iii++) { 3109 if (ddp[iii] != desc->data_bytes[iii]) { 3110 SCTP_STAT_INCR(sctps_pdrpbadd); 3111 return (-1); 3112 } 3113 } 3114 } 3115 /* 3116 * We zero out the nonce so resync not 3117 * needed 3118 */ 3119 tp1->rec.data.ect_nonce = 0; 3120 3121 if (tp1->do_rtt) { 3122 /* 3123 * this guy had a RTO calculation 3124 * pending on it, cancel it 3125 */ 3126 tp1->do_rtt = 0; 3127 } 3128 SCTP_STAT_INCR(sctps_pdrpmark); 3129 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3130 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3131 /* 3132 * mark it as if we were doing a FR, since 3133 * we will be getting gap ack reports behind 3134 * the info from the router. 3135 */ 3136 tp1->rec.data.doing_fast_retransmit = 1; 3137 /* 3138 * mark the tsn with what sequences can 3139 * cause a new FR. 3140 */ 3141 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3142 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3143 } else { 3144 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3145 } 3146 3147 /* restart the timer */ 3148 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3149 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3150 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3151 stcb, tp1->whoTo); 3152 3153 /* fix counts and things */ 3154 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3155 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3156 tp1->whoTo->flight_size, 3157 tp1->book_size, 3158 (uintptr_t) stcb, 3159 tp1->rec.data.TSN_seq); 3160 } 3161 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3162 sctp_flight_size_decrease(tp1); 3163 sctp_total_flight_decrease(stcb, tp1); 3164 } 3165 tp1->sent = SCTP_DATAGRAM_RESEND; 3166 } { 3167 /* audit code */ 3168 unsigned int audit; 3169 3170 audit = 0; 3171 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3172 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3173 audit++; 3174 } 3175 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3176 sctp_next) { 3177 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3178 audit++; 3179 } 3180 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3181 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3182 audit, stcb->asoc.sent_queue_retran_cnt); 3183 #ifndef SCTP_AUDITING_ENABLED 3184 stcb->asoc.sent_queue_retran_cnt = audit; 3185 #endif 3186 } 3187 } 3188 } 3189 break; 3190 case SCTP_ASCONF: 3191 { 3192 struct sctp_tmit_chunk *asconf; 3193 3194 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3195 sctp_next) { 3196 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3197 break; 3198 } 3199 } 3200 if (asconf) { 3201 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3202 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3203 asconf->sent = SCTP_DATAGRAM_RESEND; 3204 asconf->snd_count--; 3205 } 3206 } 3207 break; 3208 case SCTP_INITIATION: 3209 /* resend the INIT */ 3210 stcb->asoc.dropped_special_cnt++; 3211 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3212 /* 3213 * If we can get it in, in a few attempts we do 3214 * this, otherwise we let the timer fire. 3215 */ 3216 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3217 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3218 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3219 } 3220 break; 3221 case SCTP_SELECTIVE_ACK: 3222 case SCTP_NR_SELECTIVE_ACK: 3223 /* resend the sack */ 3224 sctp_send_sack(stcb); 3225 break; 3226 case SCTP_HEARTBEAT_REQUEST: 3227 /* resend a demand HB */ 3228 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3229 /* 3230 * Only retransmit if we KNOW we wont destroy the 3231 * tcb 3232 */ 3233 (void)sctp_send_hb(stcb, 1, net); 3234 } 3235 break; 3236 case SCTP_SHUTDOWN: 3237 sctp_send_shutdown(stcb, net); 3238 break; 3239 case SCTP_SHUTDOWN_ACK: 3240 sctp_send_shutdown_ack(stcb, net); 3241 break; 3242 case SCTP_COOKIE_ECHO: 3243 { 3244 struct sctp_tmit_chunk *cookie; 3245 3246 cookie = NULL; 3247 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3248 sctp_next) { 3249 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3250 break; 3251 } 3252 } 3253 if (cookie) { 3254 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3255 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3256 cookie->sent = SCTP_DATAGRAM_RESEND; 3257 sctp_stop_all_cookie_timers(stcb); 3258 } 3259 } 3260 break; 3261 case SCTP_COOKIE_ACK: 3262 sctp_send_cookie_ack(stcb); 3263 break; 3264 case SCTP_ASCONF_ACK: 3265 /* resend last asconf ack */ 3266 sctp_send_asconf_ack(stcb); 3267 break; 3268 case SCTP_FORWARD_CUM_TSN: 3269 send_forward_tsn(stcb, &stcb->asoc); 3270 break; 3271 /* can't do anything with these */ 3272 case SCTP_PACKET_DROPPED: 3273 case SCTP_INITIATION_ACK: /* this should not happen */ 3274 case SCTP_HEARTBEAT_ACK: 3275 case SCTP_ABORT_ASSOCIATION: 3276 case SCTP_OPERATION_ERROR: 3277 case SCTP_SHUTDOWN_COMPLETE: 3278 case SCTP_ECN_ECHO: 3279 case SCTP_ECN_CWR: 3280 default: 3281 break; 3282 } 3283 return (0); 3284 } 3285 3286 void 3287 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3288 { 3289 int i; 3290 uint16_t temp; 3291 3292 /* 3293 * We set things to 0xffff since this is the last delivered sequence 3294 * and we will be sending in 0 after the reset. 3295 */ 3296 3297 if (number_entries) { 3298 for (i = 0; i < number_entries; i++) { 3299 temp = ntohs(list[i]); 3300 if (temp >= stcb->asoc.streamincnt) { 3301 continue; 3302 } 3303 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3304 } 3305 } else { 3306 list = NULL; 3307 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3308 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3309 } 3310 } 3311 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3312 } 3313 3314 static void 3315 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3316 { 3317 int i; 3318 3319 if (number_entries == 0) { 3320 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3321 stcb->asoc.strmout[i].next_sequence_sent = 0; 3322 } 3323 } else if (number_entries) { 3324 for (i = 0; i < number_entries; i++) { 3325 uint16_t temp; 3326 3327 temp = ntohs(list[i]); 3328 if (temp >= stcb->asoc.streamoutcnt) { 3329 /* no such stream */ 3330 continue; 3331 } 3332 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3333 } 3334 } 3335 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3336 } 3337 3338 3339 struct sctp_stream_reset_out_request * 3340 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3341 { 3342 struct sctp_association *asoc; 3343 struct sctp_stream_reset_out_req *req; 3344 struct sctp_stream_reset_out_request *r; 3345 struct sctp_tmit_chunk *chk; 3346 int len, clen; 3347 3348 asoc = &stcb->asoc; 3349 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3350 asoc->stream_reset_outstanding = 0; 3351 return (NULL); 3352 } 3353 if (stcb->asoc.str_reset == NULL) { 3354 asoc->stream_reset_outstanding = 0; 3355 return (NULL); 3356 } 3357 chk = stcb->asoc.str_reset; 3358 if (chk->data == NULL) { 3359 return (NULL); 3360 } 3361 if (bchk) { 3362 /* he wants a copy of the chk pointer */ 3363 *bchk = chk; 3364 } 3365 clen = chk->send_size; 3366 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3367 r = &req->sr_req; 3368 if (ntohl(r->request_seq) == seq) { 3369 /* found it */ 3370 return (r); 3371 } 3372 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3373 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3374 /* move to the next one, there can only be a max of two */ 3375 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3376 if (ntohl(r->request_seq) == seq) { 3377 return (r); 3378 } 3379 } 3380 /* that seq is not here */ 3381 return (NULL); 3382 } 3383 3384 static void 3385 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3386 { 3387 struct sctp_association *asoc; 3388 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3389 3390 if (stcb->asoc.str_reset == NULL) { 3391 return; 3392 } 3393 asoc = &stcb->asoc; 3394 3395 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3396 TAILQ_REMOVE(&asoc->control_send_queue, 3397 chk, 3398 sctp_next); 3399 if (chk->data) { 3400 sctp_m_freem(chk->data); 3401 chk->data = NULL; 3402 } 3403 asoc->ctrl_queue_cnt--; 3404 sctp_free_a_chunk(stcb, chk); 3405 /* sa_ignore NO_NULL_CHK */ 3406 stcb->asoc.str_reset = NULL; 3407 } 3408 3409 3410 static int 3411 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3412 uint32_t seq, uint32_t action, 3413 struct sctp_stream_reset_response *respin) 3414 { 3415 uint16_t type; 3416 int lparm_len; 3417 struct sctp_association *asoc = &stcb->asoc; 3418 struct sctp_tmit_chunk *chk; 3419 struct sctp_stream_reset_out_request *srparam; 3420 int number_entries; 3421 3422 if (asoc->stream_reset_outstanding == 0) { 3423 /* duplicate */ 3424 return (0); 3425 } 3426 if (seq == stcb->asoc.str_reset_seq_out) { 3427 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3428 if (srparam) { 3429 stcb->asoc.str_reset_seq_out++; 3430 type = ntohs(srparam->ph.param_type); 3431 lparm_len = ntohs(srparam->ph.param_length); 3432 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3433 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3434 asoc->stream_reset_out_is_outstanding = 0; 3435 if (asoc->stream_reset_outstanding) 3436 asoc->stream_reset_outstanding--; 3437 if (action == SCTP_STREAM_RESET_PERFORMED) { 3438 /* do it */ 3439 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3440 } else { 3441 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3442 } 3443 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3444 /* Answered my request */ 3445 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3446 if (asoc->stream_reset_outstanding) 3447 asoc->stream_reset_outstanding--; 3448 if (action != SCTP_STREAM_RESET_PERFORMED) { 3449 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3450 } 3451 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3452 /* Ok we now may have more streams */ 3453 if (asoc->stream_reset_outstanding) 3454 asoc->stream_reset_outstanding--; 3455 if (action == SCTP_STREAM_RESET_PERFORMED) { 3456 /* Put the new streams into effect */ 3457 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3458 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3459 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3460 } else { 3461 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3462 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3463 } 3464 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3465 /** 3466 * a) Adopt the new in tsn. 3467 * b) reset the map 3468 * c) Adopt the new out-tsn 3469 */ 3470 struct sctp_stream_reset_response_tsn *resp; 3471 struct sctp_forward_tsn_chunk fwdtsn; 3472 int abort_flag = 0; 3473 3474 if (respin == NULL) { 3475 /* huh ? */ 3476 return (0); 3477 } 3478 if (action == SCTP_STREAM_RESET_PERFORMED) { 3479 resp = (struct sctp_stream_reset_response_tsn *)respin; 3480 asoc->stream_reset_outstanding--; 3481 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3482 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3483 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3484 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3485 if (abort_flag) { 3486 return (1); 3487 } 3488 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3489 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3490 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3491 } 3492 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3493 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3494 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3495 3496 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3497 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3498 3499 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3500 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3501 3502 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3503 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3504 3505 } 3506 } 3507 /* get rid of the request and get the request flags */ 3508 if (asoc->stream_reset_outstanding == 0) { 3509 sctp_clean_up_stream_reset(stcb); 3510 } 3511 } 3512 } 3513 return (0); 3514 } 3515 3516 static void 3517 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3518 struct sctp_tmit_chunk *chk, 3519 struct sctp_stream_reset_in_request *req, int trunc) 3520 { 3521 uint32_t seq; 3522 int len, i; 3523 int number_entries; 3524 uint16_t temp; 3525 3526 /* 3527 * peer wants me to send a str-reset to him for my outgoing seq's if 3528 * seq_in is right. 3529 */ 3530 struct sctp_association *asoc = &stcb->asoc; 3531 3532 seq = ntohl(req->request_seq); 3533 if (asoc->str_reset_seq_in == seq) { 3534 if (trunc) { 3535 /* Can't do it, since they exceeded our buffer size */ 3536 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3537 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3538 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3539 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3540 len = ntohs(req->ph.param_length); 3541 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3542 for (i = 0; i < number_entries; i++) { 3543 temp = ntohs(req->list_of_streams[i]); 3544 req->list_of_streams[i] = temp; 3545 } 3546 /* move the reset action back one */ 3547 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3548 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3549 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3550 asoc->str_reset_seq_out, 3551 seq, (asoc->sending_seq - 1)); 3552 asoc->stream_reset_out_is_outstanding = 1; 3553 asoc->str_reset = chk; 3554 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3555 stcb->asoc.stream_reset_outstanding++; 3556 } else { 3557 /* Can't do it, since we have sent one out */ 3558 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3559 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3560 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3561 } 3562 asoc->str_reset_seq_in++; 3563 } else if (asoc->str_reset_seq_in - 1 == seq) { 3564 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3565 } else if (asoc->str_reset_seq_in - 2 == seq) { 3566 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3567 } else { 3568 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3569 } 3570 } 3571 3572 static int 3573 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3574 struct sctp_tmit_chunk *chk, 3575 struct sctp_stream_reset_tsn_request *req) 3576 { 3577 /* reset all in and out and update the tsn */ 3578 /* 3579 * A) reset my str-seq's on in and out. B) Select a receive next, 3580 * and set cum-ack to it. Also process this selected number as a 3581 * fwd-tsn as well. C) set in the response my next sending seq. 3582 */ 3583 struct sctp_forward_tsn_chunk fwdtsn; 3584 struct sctp_association *asoc = &stcb->asoc; 3585 int abort_flag = 0; 3586 uint32_t seq; 3587 3588 seq = ntohl(req->request_seq); 3589 if (asoc->str_reset_seq_in == seq) { 3590 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3591 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3592 fwdtsn.ch.chunk_flags = 0; 3593 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3594 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3595 if (abort_flag) { 3596 return (1); 3597 } 3598 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3599 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3600 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3601 } 3602 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3603 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3604 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3605 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3606 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3607 atomic_add_int(&stcb->asoc.sending_seq, 1); 3608 /* save off historical data for retrans */ 3609 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3610 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3611 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3612 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3613 3614 sctp_add_stream_reset_result_tsn(chk, 3615 ntohl(req->request_seq), 3616 SCTP_STREAM_RESET_PERFORMED, 3617 stcb->asoc.sending_seq, 3618 stcb->asoc.mapping_array_base_tsn); 3619 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3620 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3621 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3622 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3623 3624 asoc->str_reset_seq_in++; 3625 } else if (asoc->str_reset_seq_in - 1 == seq) { 3626 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3627 stcb->asoc.last_sending_seq[0], 3628 stcb->asoc.last_base_tsnsent[0] 3629 ); 3630 } else if (asoc->str_reset_seq_in - 2 == seq) { 3631 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3632 stcb->asoc.last_sending_seq[1], 3633 stcb->asoc.last_base_tsnsent[1] 3634 ); 3635 } else { 3636 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3637 } 3638 return (0); 3639 } 3640 3641 static void 3642 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3643 struct sctp_tmit_chunk *chk, 3644 struct sctp_stream_reset_out_request *req, int trunc) 3645 { 3646 uint32_t seq, tsn; 3647 int number_entries, len; 3648 struct sctp_association *asoc = &stcb->asoc; 3649 3650 seq = ntohl(req->request_seq); 3651 3652 /* now if its not a duplicate we process it */ 3653 if (asoc->str_reset_seq_in == seq) { 3654 len = ntohs(req->ph.param_length); 3655 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3656 /* 3657 * the sender is resetting, handle the list issue.. we must 3658 * a) verify if we can do the reset, if so no problem b) If 3659 * we can't do the reset we must copy the request. c) queue 3660 * it, and setup the data in processor to trigger it off 3661 * when needed and dequeue all the queued data. 3662 */ 3663 tsn = ntohl(req->send_reset_at_tsn); 3664 3665 /* move the reset action back one */ 3666 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3667 if (trunc) { 3668 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3669 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3670 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3671 /* we can do it now */ 3672 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3673 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3674 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3675 } else { 3676 /* 3677 * we must queue it up and thus wait for the TSN's 3678 * to arrive that are at or before tsn 3679 */ 3680 struct sctp_stream_reset_list *liste; 3681 int siz; 3682 3683 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3684 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3685 siz, SCTP_M_STRESET); 3686 if (liste == NULL) { 3687 /* gak out of memory */ 3688 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3689 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3690 return; 3691 } 3692 liste->tsn = tsn; 3693 liste->number_entries = number_entries; 3694 memcpy(&liste->req, req, 3695 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3696 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3697 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3698 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3699 } 3700 asoc->str_reset_seq_in++; 3701 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3702 /* 3703 * one seq back, just echo back last action since my 3704 * response was lost. 3705 */ 3706 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3707 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3708 /* 3709 * two seq back, just echo back last action since my 3710 * response was lost. 3711 */ 3712 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3713 } else { 3714 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3715 } 3716 } 3717 3718 static void 3719 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3720 struct sctp_stream_reset_add_strm *str_add) 3721 { 3722 /* 3723 * Peer is requesting to add more streams. If its within our 3724 * max-streams we will allow it. 3725 */ 3726 uint16_t num_stream, i; 3727 uint32_t seq; 3728 struct sctp_association *asoc = &stcb->asoc; 3729 struct sctp_queued_to_read *ctl, *nctl; 3730 3731 /* Get the number. */ 3732 seq = ntohl(str_add->request_seq); 3733 num_stream = ntohs(str_add->number_of_streams); 3734 /* Now what would be the new total? */ 3735 if (asoc->str_reset_seq_in == seq) { 3736 num_stream += stcb->asoc.streamincnt; 3737 if (num_stream > stcb->asoc.max_inbound_streams) { 3738 /* We must reject it they ask for to many */ 3739 denied: 3740 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3741 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3742 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3743 } else { 3744 /* Ok, we can do that :-) */ 3745 struct sctp_stream_in *oldstrm; 3746 3747 /* save off the old */ 3748 oldstrm = stcb->asoc.strmin; 3749 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3750 (num_stream * sizeof(struct sctp_stream_in)), 3751 SCTP_M_STRMI); 3752 if (stcb->asoc.strmin == NULL) { 3753 stcb->asoc.strmin = oldstrm; 3754 goto denied; 3755 } 3756 /* copy off the old data */ 3757 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3758 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3759 stcb->asoc.strmin[i].stream_no = i; 3760 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3761 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3762 /* now anything on those queues? */ 3763 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3764 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3765 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3766 } 3767 } 3768 /* Init the new streams */ 3769 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3770 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3771 stcb->asoc.strmin[i].stream_no = i; 3772 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3773 stcb->asoc.strmin[i].delivery_started = 0; 3774 } 3775 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3776 /* update the size */ 3777 stcb->asoc.streamincnt = num_stream; 3778 /* Send the ack */ 3779 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3780 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3781 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3782 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3783 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3784 } 3785 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3786 /* 3787 * one seq back, just echo back last action since my 3788 * response was lost. 3789 */ 3790 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3791 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3792 /* 3793 * two seq back, just echo back last action since my 3794 * response was lost. 3795 */ 3796 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3797 } else { 3798 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3799 3800 } 3801 } 3802 3803 #ifdef __GNUC__ 3804 __attribute__((noinline)) 3805 #endif 3806 static int 3807 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3808 struct sctp_stream_reset_out_req *sr_req) 3809 { 3810 int chk_length, param_len, ptype; 3811 struct sctp_paramhdr pstore; 3812 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3813 3814 uint32_t seq; 3815 int num_req = 0; 3816 int trunc = 0; 3817 struct sctp_tmit_chunk *chk; 3818 struct sctp_chunkhdr *ch; 3819 struct sctp_paramhdr *ph; 3820 int ret_code = 0; 3821 int num_param = 0; 3822 3823 /* now it may be a reset or a reset-response */ 3824 chk_length = ntohs(sr_req->ch.chunk_length); 3825 3826 /* setup for adding the response */ 3827 sctp_alloc_a_chunk(stcb, chk); 3828 if (chk == NULL) { 3829 return (ret_code); 3830 } 3831 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3832 chk->rec.chunk_id.can_take_data = 0; 3833 chk->asoc = &stcb->asoc; 3834 chk->no_fr_allowed = 0; 3835 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3836 chk->book_size_scale = 0; 3837 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3838 if (chk->data == NULL) { 3839 strres_nochunk: 3840 if (chk->data) { 3841 sctp_m_freem(chk->data); 3842 chk->data = NULL; 3843 } 3844 sctp_free_a_chunk(stcb, chk); 3845 return (ret_code); 3846 } 3847 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3848 3849 /* setup chunk parameters */ 3850 chk->sent = SCTP_DATAGRAM_UNSENT; 3851 chk->snd_count = 0; 3852 chk->whoTo = stcb->asoc.primary_destination; 3853 atomic_add_int(&chk->whoTo->ref_count, 1); 3854 3855 ch = mtod(chk->data, struct sctp_chunkhdr *); 3856 ch->chunk_type = SCTP_STREAM_RESET; 3857 ch->chunk_flags = 0; 3858 ch->chunk_length = htons(chk->send_size); 3859 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3860 offset += sizeof(struct sctp_chunkhdr); 3861 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3862 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3863 if (ph == NULL) 3864 break; 3865 param_len = ntohs(ph->param_length); 3866 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3867 /* bad param */ 3868 break; 3869 } 3870 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3871 (uint8_t *) & cstore); 3872 ptype = ntohs(ph->param_type); 3873 num_param++; 3874 if (param_len > (int)sizeof(cstore)) { 3875 trunc = 1; 3876 } else { 3877 trunc = 0; 3878 } 3879 3880 if (num_param > SCTP_MAX_RESET_PARAMS) { 3881 /* hit the max of parameters already sorry.. */ 3882 break; 3883 } 3884 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3885 struct sctp_stream_reset_out_request *req_out; 3886 3887 req_out = (struct sctp_stream_reset_out_request *)ph; 3888 num_req++; 3889 if (stcb->asoc.stream_reset_outstanding) { 3890 seq = ntohl(req_out->response_seq); 3891 if (seq == stcb->asoc.str_reset_seq_out) { 3892 /* implicit ack */ 3893 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3894 } 3895 } 3896 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3897 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3898 struct sctp_stream_reset_add_strm *str_add; 3899 3900 str_add = (struct sctp_stream_reset_add_strm *)ph; 3901 num_req++; 3902 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3903 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3904 struct sctp_stream_reset_in_request *req_in; 3905 3906 num_req++; 3907 3908 req_in = (struct sctp_stream_reset_in_request *)ph; 3909 3910 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3911 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3912 struct sctp_stream_reset_tsn_request *req_tsn; 3913 3914 num_req++; 3915 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3916 3917 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3918 ret_code = 1; 3919 goto strres_nochunk; 3920 } 3921 /* no more */ 3922 break; 3923 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3924 struct sctp_stream_reset_response *resp; 3925 uint32_t result; 3926 3927 resp = (struct sctp_stream_reset_response *)ph; 3928 seq = ntohl(resp->response_seq); 3929 result = ntohl(resp->result); 3930 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3931 ret_code = 1; 3932 goto strres_nochunk; 3933 } 3934 } else { 3935 break; 3936 } 3937 offset += SCTP_SIZE32(param_len); 3938 chk_length -= SCTP_SIZE32(param_len); 3939 } 3940 if (num_req == 0) { 3941 /* we have no response free the stuff */ 3942 goto strres_nochunk; 3943 } 3944 /* ok we have a chunk to link in */ 3945 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3946 chk, 3947 sctp_next); 3948 stcb->asoc.ctrl_queue_cnt++; 3949 return (ret_code); 3950 } 3951 3952 /* 3953 * Handle a router or endpoints report of a packet loss, there are two ways 3954 * to handle this, either we get the whole packet and must disect it 3955 * ourselves (possibly with truncation and or corruption) or it is a summary 3956 * from a middle box that did the disectting for us. 3957 */ 3958 static void 3959 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3960 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3961 { 3962 uint32_t bottle_bw, on_queue; 3963 uint16_t trunc_len; 3964 unsigned int chlen; 3965 unsigned int at; 3966 struct sctp_chunk_desc desc; 3967 struct sctp_chunkhdr *ch; 3968 3969 chlen = ntohs(cp->ch.chunk_length); 3970 chlen -= sizeof(struct sctp_pktdrop_chunk); 3971 /* XXX possible chlen underflow */ 3972 if (chlen == 0) { 3973 ch = NULL; 3974 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3975 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3976 } else { 3977 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3978 chlen -= sizeof(struct sctphdr); 3979 /* XXX possible chlen underflow */ 3980 memset(&desc, 0, sizeof(desc)); 3981 } 3982 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3983 if (trunc_len > limit) { 3984 trunc_len = limit; 3985 } 3986 /* now the chunks themselves */ 3987 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3988 desc.chunk_type = ch->chunk_type; 3989 /* get amount we need to move */ 3990 at = ntohs(ch->chunk_length); 3991 if (at < sizeof(struct sctp_chunkhdr)) { 3992 /* corrupt chunk, maybe at the end? */ 3993 SCTP_STAT_INCR(sctps_pdrpcrupt); 3994 break; 3995 } 3996 if (trunc_len == 0) { 3997 /* we are supposed to have all of it */ 3998 if (at > chlen) { 3999 /* corrupt skip it */ 4000 SCTP_STAT_INCR(sctps_pdrpcrupt); 4001 break; 4002 } 4003 } else { 4004 /* is there enough of it left ? */ 4005 if (desc.chunk_type == SCTP_DATA) { 4006 if (chlen < (sizeof(struct sctp_data_chunk) + 4007 sizeof(desc.data_bytes))) { 4008 break; 4009 } 4010 } else { 4011 if (chlen < sizeof(struct sctp_chunkhdr)) { 4012 break; 4013 } 4014 } 4015 } 4016 if (desc.chunk_type == SCTP_DATA) { 4017 /* can we get out the tsn? */ 4018 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4019 SCTP_STAT_INCR(sctps_pdrpmbda); 4020 4021 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4022 /* yep */ 4023 struct sctp_data_chunk *dcp; 4024 uint8_t *ddp; 4025 unsigned int iii; 4026 4027 dcp = (struct sctp_data_chunk *)ch; 4028 ddp = (uint8_t *) (dcp + 1); 4029 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4030 desc.data_bytes[iii] = ddp[iii]; 4031 } 4032 desc.tsn_ifany = dcp->dp.tsn; 4033 } else { 4034 /* nope we are done. */ 4035 SCTP_STAT_INCR(sctps_pdrpnedat); 4036 break; 4037 } 4038 } else { 4039 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4040 SCTP_STAT_INCR(sctps_pdrpmbct); 4041 } 4042 4043 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4044 SCTP_STAT_INCR(sctps_pdrppdbrk); 4045 break; 4046 } 4047 if (SCTP_SIZE32(at) > chlen) { 4048 break; 4049 } 4050 chlen -= SCTP_SIZE32(at); 4051 if (chlen < sizeof(struct sctp_chunkhdr)) { 4052 /* done, none left */ 4053 break; 4054 } 4055 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4056 } 4057 /* Now update any rwnd --- possibly */ 4058 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4059 /* From a peer, we get a rwnd report */ 4060 uint32_t a_rwnd; 4061 4062 SCTP_STAT_INCR(sctps_pdrpfehos); 4063 4064 bottle_bw = ntohl(cp->bottle_bw); 4065 on_queue = ntohl(cp->current_onq); 4066 if (bottle_bw && on_queue) { 4067 /* a rwnd report is in here */ 4068 if (bottle_bw > on_queue) 4069 a_rwnd = bottle_bw - on_queue; 4070 else 4071 a_rwnd = 0; 4072 4073 if (a_rwnd == 0) 4074 stcb->asoc.peers_rwnd = 0; 4075 else { 4076 if (a_rwnd > stcb->asoc.total_flight) { 4077 stcb->asoc.peers_rwnd = 4078 a_rwnd - stcb->asoc.total_flight; 4079 } else { 4080 stcb->asoc.peers_rwnd = 0; 4081 } 4082 if (stcb->asoc.peers_rwnd < 4083 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4084 /* SWS sender side engages */ 4085 stcb->asoc.peers_rwnd = 0; 4086 } 4087 } 4088 } 4089 } else { 4090 SCTP_STAT_INCR(sctps_pdrpfmbox); 4091 } 4092 4093 /* now middle boxes in sat networks get a cwnd bump */ 4094 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4095 (stcb->asoc.sat_t3_loss_recovery == 0) && 4096 (stcb->asoc.sat_network)) { 4097 /* 4098 * This is debateable but for sat networks it makes sense 4099 * Note if a T3 timer has went off, we will prohibit any 4100 * changes to cwnd until we exit the t3 loss recovery. 4101 */ 4102 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4103 net, cp, &bottle_bw, &on_queue); 4104 } 4105 } 4106 4107 /* 4108 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4109 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4110 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4111 * length of the complete packet outputs: - length: modified to remaining 4112 * length after control processing - netp: modified to new sctp_nets after 4113 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4114 * bad packet,...) otherwise return the tcb for this packet 4115 */ 4116 #ifdef __GNUC__ 4117 __attribute__((noinline)) 4118 #endif 4119 static struct sctp_tcb * 4120 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4121 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4122 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4123 uint32_t vrf_id, uint16_t port) 4124 { 4125 struct sctp_association *asoc; 4126 uint32_t vtag_in; 4127 int num_chunks = 0; /* number of control chunks processed */ 4128 uint32_t chk_length; 4129 int ret; 4130 int abort_no_unlock = 0; 4131 4132 /* 4133 * How big should this be, and should it be alloc'd? Lets try the 4134 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4135 * until we get into jumbo grams and such.. 4136 */ 4137 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4138 struct sctp_tcb *locked_tcb = stcb; 4139 int got_auth = 0; 4140 uint32_t auth_offset = 0, auth_len = 0; 4141 int auth_skipped = 0; 4142 int asconf_cnt = 0; 4143 4144 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4145 struct socket *so; 4146 4147 #endif 4148 4149 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4150 iphlen, *offset, length, stcb); 4151 4152 /* validate chunk header length... */ 4153 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4154 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4155 ntohs(ch->chunk_length)); 4156 if (locked_tcb) { 4157 SCTP_TCB_UNLOCK(locked_tcb); 4158 } 4159 return (NULL); 4160 } 4161 /* 4162 * validate the verification tag 4163 */ 4164 vtag_in = ntohl(sh->v_tag); 4165 4166 if (locked_tcb) { 4167 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4168 } 4169 if (ch->chunk_type == SCTP_INITIATION) { 4170 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4171 ntohs(ch->chunk_length), vtag_in); 4172 if (vtag_in != 0) { 4173 /* protocol error- silently discard... */ 4174 SCTP_STAT_INCR(sctps_badvtag); 4175 if (locked_tcb) { 4176 SCTP_TCB_UNLOCK(locked_tcb); 4177 } 4178 return (NULL); 4179 } 4180 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4181 /* 4182 * If there is no stcb, skip the AUTH chunk and process 4183 * later after a stcb is found (to validate the lookup was 4184 * valid. 4185 */ 4186 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4187 (stcb == NULL) && 4188 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4189 /* save this chunk for later processing */ 4190 auth_skipped = 1; 4191 auth_offset = *offset; 4192 auth_len = ntohs(ch->chunk_length); 4193 4194 /* (temporarily) move past this chunk */ 4195 *offset += SCTP_SIZE32(auth_len); 4196 if (*offset >= length) { 4197 /* no more data left in the mbuf chain */ 4198 *offset = length; 4199 if (locked_tcb) { 4200 SCTP_TCB_UNLOCK(locked_tcb); 4201 } 4202 return (NULL); 4203 } 4204 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4205 sizeof(struct sctp_chunkhdr), chunk_buf); 4206 } 4207 if (ch == NULL) { 4208 /* Help */ 4209 *offset = length; 4210 if (locked_tcb) { 4211 SCTP_TCB_UNLOCK(locked_tcb); 4212 } 4213 return (NULL); 4214 } 4215 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4216 goto process_control_chunks; 4217 } 4218 /* 4219 * first check if it's an ASCONF with an unknown src addr we 4220 * need to look inside to find the association 4221 */ 4222 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4223 struct sctp_chunkhdr *asconf_ch = ch; 4224 uint32_t asconf_offset = 0, asconf_len = 0; 4225 4226 /* inp's refcount may be reduced */ 4227 SCTP_INP_INCR_REF(inp); 4228 4229 asconf_offset = *offset; 4230 do { 4231 asconf_len = ntohs(asconf_ch->chunk_length); 4232 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4233 break; 4234 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4235 *offset, sh, &inp, netp, vrf_id); 4236 if (stcb != NULL) 4237 break; 4238 asconf_offset += SCTP_SIZE32(asconf_len); 4239 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4240 sizeof(struct sctp_chunkhdr), chunk_buf); 4241 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4242 if (stcb == NULL) { 4243 /* 4244 * reduce inp's refcount if not reduced in 4245 * sctp_findassociation_ep_asconf(). 4246 */ 4247 SCTP_INP_DECR_REF(inp); 4248 } else { 4249 locked_tcb = stcb; 4250 } 4251 4252 /* now go back and verify any auth chunk to be sure */ 4253 if (auth_skipped && (stcb != NULL)) { 4254 struct sctp_auth_chunk *auth; 4255 4256 auth = (struct sctp_auth_chunk *) 4257 sctp_m_getptr(m, auth_offset, 4258 auth_len, chunk_buf); 4259 got_auth = 1; 4260 auth_skipped = 0; 4261 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4262 auth_offset)) { 4263 /* auth HMAC failed so dump it */ 4264 *offset = length; 4265 if (locked_tcb) { 4266 SCTP_TCB_UNLOCK(locked_tcb); 4267 } 4268 return (NULL); 4269 } else { 4270 /* remaining chunks are HMAC checked */ 4271 stcb->asoc.authenticated = 1; 4272 } 4273 } 4274 } 4275 if (stcb == NULL) { 4276 /* no association, so it's out of the blue... */ 4277 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4278 vrf_id, port); 4279 *offset = length; 4280 if (locked_tcb) { 4281 SCTP_TCB_UNLOCK(locked_tcb); 4282 } 4283 return (NULL); 4284 } 4285 asoc = &stcb->asoc; 4286 /* ABORT and SHUTDOWN can use either v_tag... */ 4287 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4288 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4289 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4290 if ((vtag_in == asoc->my_vtag) || 4291 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4292 (vtag_in == asoc->peer_vtag))) { 4293 /* this is valid */ 4294 } else { 4295 /* drop this packet... */ 4296 SCTP_STAT_INCR(sctps_badvtag); 4297 if (locked_tcb) { 4298 SCTP_TCB_UNLOCK(locked_tcb); 4299 } 4300 return (NULL); 4301 } 4302 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4303 if (vtag_in != asoc->my_vtag) { 4304 /* 4305 * this could be a stale SHUTDOWN-ACK or the 4306 * peer never got the SHUTDOWN-COMPLETE and 4307 * is still hung; we have started a new asoc 4308 * but it won't complete until the shutdown 4309 * is completed 4310 */ 4311 if (locked_tcb) { 4312 SCTP_TCB_UNLOCK(locked_tcb); 4313 } 4314 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4315 NULL, vrf_id, port); 4316 return (NULL); 4317 } 4318 } else { 4319 /* for all other chunks, vtag must match */ 4320 if (vtag_in != asoc->my_vtag) { 4321 /* invalid vtag... */ 4322 SCTPDBG(SCTP_DEBUG_INPUT3, 4323 "invalid vtag: %xh, expect %xh\n", 4324 vtag_in, asoc->my_vtag); 4325 SCTP_STAT_INCR(sctps_badvtag); 4326 if (locked_tcb) { 4327 SCTP_TCB_UNLOCK(locked_tcb); 4328 } 4329 *offset = length; 4330 return (NULL); 4331 } 4332 } 4333 } /* end if !SCTP_COOKIE_ECHO */ 4334 /* 4335 * process all control chunks... 4336 */ 4337 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4338 /* EY */ 4339 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4340 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4341 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4342 /* implied cookie-ack.. we must have lost the ack */ 4343 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4344 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4345 stcb->asoc.overall_error_count, 4346 0, 4347 SCTP_FROM_SCTP_INPUT, 4348 __LINE__); 4349 } 4350 stcb->asoc.overall_error_count = 0; 4351 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4352 *netp); 4353 } 4354 process_control_chunks: 4355 while (IS_SCTP_CONTROL(ch)) { 4356 /* validate chunk length */ 4357 chk_length = ntohs(ch->chunk_length); 4358 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4359 ch->chunk_type, chk_length); 4360 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4361 if (chk_length < sizeof(*ch) || 4362 (*offset + (int)chk_length) > length) { 4363 *offset = length; 4364 if (locked_tcb) { 4365 SCTP_TCB_UNLOCK(locked_tcb); 4366 } 4367 return (NULL); 4368 } 4369 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4370 /* 4371 * INIT-ACK only gets the init ack "header" portion only 4372 * because we don't have to process the peer's COOKIE. All 4373 * others get a complete chunk. 4374 */ 4375 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4376 (ch->chunk_type == SCTP_INITIATION)) { 4377 /* get an init-ack chunk */ 4378 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4379 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4380 if (ch == NULL) { 4381 *offset = length; 4382 if (locked_tcb) { 4383 SCTP_TCB_UNLOCK(locked_tcb); 4384 } 4385 return (NULL); 4386 } 4387 } else { 4388 /* For cookies and all other chunks. */ 4389 if (chk_length > sizeof(chunk_buf)) { 4390 /* 4391 * use just the size of the chunk buffer so 4392 * the front part of our chunks fit in 4393 * contiguous space up to the chunk buffer 4394 * size (508 bytes). For chunks that need to 4395 * get more than that they must use the 4396 * sctp_m_getptr() function or other means 4397 * (e.g. know how to parse mbuf chains). 4398 * Cookies do this already. 4399 */ 4400 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4401 (sizeof(chunk_buf) - 4), 4402 chunk_buf); 4403 if (ch == NULL) { 4404 *offset = length; 4405 if (locked_tcb) { 4406 SCTP_TCB_UNLOCK(locked_tcb); 4407 } 4408 return (NULL); 4409 } 4410 } else { 4411 /* We can fit it all */ 4412 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4413 chk_length, chunk_buf); 4414 if (ch == NULL) { 4415 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4416 *offset = length; 4417 if (locked_tcb) { 4418 SCTP_TCB_UNLOCK(locked_tcb); 4419 } 4420 return (NULL); 4421 } 4422 } 4423 } 4424 num_chunks++; 4425 /* Save off the last place we got a control from */ 4426 if (stcb != NULL) { 4427 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4428 /* 4429 * allow last_control to be NULL if 4430 * ASCONF... ASCONF processing will find the 4431 * right net later 4432 */ 4433 if ((netp != NULL) && (*netp != NULL)) 4434 stcb->asoc.last_control_chunk_from = *netp; 4435 } 4436 } 4437 #ifdef SCTP_AUDITING_ENABLED 4438 sctp_audit_log(0xB0, ch->chunk_type); 4439 #endif 4440 4441 /* check to see if this chunk required auth, but isn't */ 4442 if ((stcb != NULL) && 4443 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4444 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4445 !stcb->asoc.authenticated) { 4446 /* "silently" ignore */ 4447 SCTP_STAT_INCR(sctps_recvauthmissing); 4448 goto next_chunk; 4449 } 4450 switch (ch->chunk_type) { 4451 case SCTP_INITIATION: 4452 /* must be first and only chunk */ 4453 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4454 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4455 /* We are not interested anymore? */ 4456 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4457 /* 4458 * collision case where we are 4459 * sending to them too 4460 */ 4461 ; 4462 } else { 4463 if (locked_tcb) { 4464 SCTP_TCB_UNLOCK(locked_tcb); 4465 } 4466 *offset = length; 4467 return (NULL); 4468 } 4469 } 4470 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4471 (num_chunks > 1) || 4472 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4473 *offset = length; 4474 if (locked_tcb) { 4475 SCTP_TCB_UNLOCK(locked_tcb); 4476 } 4477 return (NULL); 4478 } 4479 if ((stcb != NULL) && 4480 (SCTP_GET_STATE(&stcb->asoc) == 4481 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4482 sctp_send_shutdown_ack(stcb, 4483 stcb->asoc.primary_destination); 4484 *offset = length; 4485 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4486 if (locked_tcb) { 4487 SCTP_TCB_UNLOCK(locked_tcb); 4488 } 4489 return (NULL); 4490 } 4491 if (netp) { 4492 sctp_handle_init(m, iphlen, *offset, sh, 4493 (struct sctp_init_chunk *)ch, inp, 4494 stcb, *netp, &abort_no_unlock, vrf_id, port); 4495 } 4496 if (abort_no_unlock) 4497 return (NULL); 4498 4499 *offset = length; 4500 if (locked_tcb) { 4501 SCTP_TCB_UNLOCK(locked_tcb); 4502 } 4503 return (NULL); 4504 break; 4505 case SCTP_PAD_CHUNK: 4506 break; 4507 case SCTP_INITIATION_ACK: 4508 /* must be first and only chunk */ 4509 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4510 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4511 /* We are not interested anymore */ 4512 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4513 ; 4514 } else { 4515 if (locked_tcb != stcb) { 4516 /* Very unlikely */ 4517 SCTP_TCB_UNLOCK(locked_tcb); 4518 } 4519 *offset = length; 4520 if (stcb) { 4521 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4522 so = SCTP_INP_SO(inp); 4523 atomic_add_int(&stcb->asoc.refcnt, 1); 4524 SCTP_TCB_UNLOCK(stcb); 4525 SCTP_SOCKET_LOCK(so, 1); 4526 SCTP_TCB_LOCK(stcb); 4527 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4528 #endif 4529 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4530 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4531 SCTP_SOCKET_UNLOCK(so, 1); 4532 #endif 4533 } 4534 return (NULL); 4535 } 4536 } 4537 if ((num_chunks > 1) || 4538 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4539 *offset = length; 4540 if (locked_tcb) { 4541 SCTP_TCB_UNLOCK(locked_tcb); 4542 } 4543 return (NULL); 4544 } 4545 if ((netp) && (*netp)) { 4546 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4547 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4548 } else { 4549 ret = -1; 4550 } 4551 /* 4552 * Special case, I must call the output routine to 4553 * get the cookie echoed 4554 */ 4555 if (abort_no_unlock) 4556 return (NULL); 4557 4558 if ((stcb) && ret == 0) 4559 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4560 *offset = length; 4561 if (locked_tcb) { 4562 SCTP_TCB_UNLOCK(locked_tcb); 4563 } 4564 return (NULL); 4565 break; 4566 case SCTP_SELECTIVE_ACK: 4567 { 4568 struct sctp_sack_chunk *sack; 4569 int abort_now = 0; 4570 uint32_t a_rwnd, cum_ack; 4571 uint16_t num_seg, num_dup; 4572 uint8_t flags; 4573 int offset_seg, offset_dup; 4574 int nonce_sum_flag; 4575 4576 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4577 SCTP_STAT_INCR(sctps_recvsacks); 4578 if (stcb == NULL) { 4579 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4580 break; 4581 } 4582 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4583 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4584 break; 4585 } 4586 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4587 /*- 4588 * If we have sent a shutdown-ack, we will pay no 4589 * attention to a sack sent in to us since 4590 * we don't care anymore. 4591 */ 4592 break; 4593 } 4594 sack = (struct sctp_sack_chunk *)ch; 4595 flags = ch->chunk_flags; 4596 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4597 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4598 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4599 num_dup = ntohs(sack->sack.num_dup_tsns); 4600 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4601 if (sizeof(struct sctp_sack_chunk) + 4602 num_seg * sizeof(struct sctp_gap_ack_block) + 4603 num_dup * sizeof(uint32_t) != chk_length) { 4604 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4605 break; 4606 } 4607 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4608 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4609 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4610 cum_ack, num_seg, a_rwnd); 4611 stcb->asoc.seen_a_sack_this_pkt = 1; 4612 if ((stcb->asoc.pr_sctp_cnt == 0) && 4613 (num_seg == 0) && 4614 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4615 (stcb->asoc.saw_sack_with_frags == 0) && 4616 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4617 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4618 ) { 4619 /* 4620 * We have a SIMPLE sack having no 4621 * prior segments and data on sent 4622 * queue to be acked.. Use the 4623 * faster path sack processing. We 4624 * also allow window update sacks 4625 * with no missing segments to go 4626 * this way too. 4627 */ 4628 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4629 &abort_now); 4630 } else { 4631 if (netp && *netp) 4632 sctp_handle_sack(m, offset_seg, offset_dup, 4633 stcb, *netp, 4634 num_seg, 0, num_dup, &abort_now, flags, 4635 cum_ack, a_rwnd); 4636 } 4637 if (abort_now) { 4638 /* ABORT signal from sack processing */ 4639 *offset = length; 4640 return (NULL); 4641 } 4642 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4643 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4644 (stcb->asoc.stream_queue_cnt == 0)) { 4645 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4646 } 4647 } 4648 break; 4649 /* 4650 * EY - nr_sack: If the received chunk is an 4651 * nr_sack chunk 4652 */ 4653 case SCTP_NR_SELECTIVE_ACK: 4654 { 4655 struct sctp_nr_sack_chunk *nr_sack; 4656 int abort_now = 0; 4657 uint32_t a_rwnd, cum_ack; 4658 uint16_t num_seg, num_nr_seg, num_dup; 4659 uint8_t flags; 4660 int offset_seg, offset_dup; 4661 int nonce_sum_flag; 4662 4663 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4664 SCTP_STAT_INCR(sctps_recvsacks); 4665 if (stcb == NULL) { 4666 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4667 break; 4668 } 4669 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4670 (stcb->asoc.peer_supports_nr_sack == 0)) { 4671 goto unknown_chunk; 4672 } 4673 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4674 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4675 break; 4676 } 4677 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4678 /*- 4679 * If we have sent a shutdown-ack, we will pay no 4680 * attention to a sack sent in to us since 4681 * we don't care anymore. 4682 */ 4683 break; 4684 } 4685 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4686 flags = ch->chunk_flags; 4687 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4688 4689 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4690 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4691 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4692 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4693 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4694 if (sizeof(struct sctp_nr_sack_chunk) + 4695 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4696 num_dup * sizeof(uint32_t) != chk_length) { 4697 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4698 break; 4699 } 4700 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4701 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4702 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4703 cum_ack, num_seg, a_rwnd); 4704 stcb->asoc.seen_a_sack_this_pkt = 1; 4705 if ((stcb->asoc.pr_sctp_cnt == 0) && 4706 (num_seg == 0) && (num_nr_seg == 0) && 4707 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4708 (stcb->asoc.saw_sack_with_frags == 0) && 4709 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4710 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4711 /* 4712 * We have a SIMPLE sack having no 4713 * prior segments and data on sent 4714 * queue to be acked. Use the faster 4715 * path sack processing. We also 4716 * allow window update sacks with no 4717 * missing segments to go this way 4718 * too. 4719 */ 4720 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4721 &abort_now); 4722 } else { 4723 if (netp && *netp) 4724 sctp_handle_sack(m, offset_seg, offset_dup, 4725 stcb, *netp, 4726 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4727 cum_ack, a_rwnd); 4728 } 4729 if (abort_now) { 4730 /* ABORT signal from sack processing */ 4731 *offset = length; 4732 return (NULL); 4733 } 4734 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4735 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4736 (stcb->asoc.stream_queue_cnt == 0)) { 4737 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4738 } 4739 } 4740 break; 4741 4742 case SCTP_HEARTBEAT_REQUEST: 4743 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4744 if ((stcb) && netp && *netp) { 4745 SCTP_STAT_INCR(sctps_recvheartbeat); 4746 sctp_send_heartbeat_ack(stcb, m, *offset, 4747 chk_length, *netp); 4748 4749 /* He's alive so give him credit */ 4750 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4751 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4752 stcb->asoc.overall_error_count, 4753 0, 4754 SCTP_FROM_SCTP_INPUT, 4755 __LINE__); 4756 } 4757 stcb->asoc.overall_error_count = 0; 4758 } 4759 break; 4760 case SCTP_HEARTBEAT_ACK: 4761 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4762 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4763 /* Its not ours */ 4764 *offset = length; 4765 if (locked_tcb) { 4766 SCTP_TCB_UNLOCK(locked_tcb); 4767 } 4768 return (NULL); 4769 } 4770 /* He's alive so give him credit */ 4771 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4772 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4773 stcb->asoc.overall_error_count, 4774 0, 4775 SCTP_FROM_SCTP_INPUT, 4776 __LINE__); 4777 } 4778 stcb->asoc.overall_error_count = 0; 4779 SCTP_STAT_INCR(sctps_recvheartbeatack); 4780 if (netp && *netp) 4781 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4782 stcb, *netp); 4783 break; 4784 case SCTP_ABORT_ASSOCIATION: 4785 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4786 stcb); 4787 if ((stcb) && netp && *netp) 4788 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4789 stcb, *netp); 4790 *offset = length; 4791 return (NULL); 4792 break; 4793 case SCTP_SHUTDOWN: 4794 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4795 stcb); 4796 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4797 *offset = length; 4798 if (locked_tcb) { 4799 SCTP_TCB_UNLOCK(locked_tcb); 4800 } 4801 return (NULL); 4802 } 4803 if (netp && *netp) { 4804 int abort_flag = 0; 4805 4806 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4807 stcb, *netp, &abort_flag); 4808 if (abort_flag) { 4809 *offset = length; 4810 return (NULL); 4811 } 4812 } 4813 break; 4814 case SCTP_SHUTDOWN_ACK: 4815 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4816 if ((stcb) && (netp) && (*netp)) 4817 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4818 *offset = length; 4819 return (NULL); 4820 break; 4821 4822 case SCTP_OPERATION_ERROR: 4823 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4824 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4825 4826 *offset = length; 4827 return (NULL); 4828 } 4829 break; 4830 case SCTP_COOKIE_ECHO: 4831 SCTPDBG(SCTP_DEBUG_INPUT3, 4832 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4833 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4834 ; 4835 } else { 4836 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4837 /* We are not interested anymore */ 4838 abend: 4839 if (stcb) { 4840 SCTP_TCB_UNLOCK(stcb); 4841 } 4842 *offset = length; 4843 return (NULL); 4844 } 4845 } 4846 /* 4847 * First are we accepting? We do this again here 4848 * since it is possible that a previous endpoint WAS 4849 * listening responded to a INIT-ACK and then 4850 * closed. We opened and bound.. and are now no 4851 * longer listening. 4852 */ 4853 4854 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4855 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4856 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4857 struct mbuf *oper; 4858 struct sctp_paramhdr *phdr; 4859 4860 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4861 0, M_DONTWAIT, 1, MT_DATA); 4862 if (oper) { 4863 SCTP_BUF_LEN(oper) = 4864 sizeof(struct sctp_paramhdr); 4865 phdr = mtod(oper, 4866 struct sctp_paramhdr *); 4867 phdr->param_type = 4868 htons(SCTP_CAUSE_OUT_OF_RESC); 4869 phdr->param_length = 4870 htons(sizeof(struct sctp_paramhdr)); 4871 } 4872 sctp_abort_association(inp, stcb, m, 4873 iphlen, sh, oper, vrf_id, port); 4874 } 4875 *offset = length; 4876 return (NULL); 4877 } else { 4878 struct mbuf *ret_buf; 4879 struct sctp_inpcb *linp; 4880 4881 if (stcb) { 4882 linp = NULL; 4883 } else { 4884 linp = inp; 4885 } 4886 4887 if (linp) { 4888 SCTP_ASOC_CREATE_LOCK(linp); 4889 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4890 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4891 SCTP_ASOC_CREATE_UNLOCK(linp); 4892 goto abend; 4893 } 4894 } 4895 if (netp) { 4896 ret_buf = 4897 sctp_handle_cookie_echo(m, iphlen, 4898 *offset, sh, 4899 (struct sctp_cookie_echo_chunk *)ch, 4900 &inp, &stcb, netp, 4901 auth_skipped, 4902 auth_offset, 4903 auth_len, 4904 &locked_tcb, 4905 vrf_id, 4906 port); 4907 } else { 4908 ret_buf = NULL; 4909 } 4910 if (linp) { 4911 SCTP_ASOC_CREATE_UNLOCK(linp); 4912 } 4913 if (ret_buf == NULL) { 4914 if (locked_tcb) { 4915 SCTP_TCB_UNLOCK(locked_tcb); 4916 } 4917 SCTPDBG(SCTP_DEBUG_INPUT3, 4918 "GAK, null buffer\n"); 4919 auth_skipped = 0; 4920 *offset = length; 4921 return (NULL); 4922 } 4923 /* if AUTH skipped, see if it verified... */ 4924 if (auth_skipped) { 4925 got_auth = 1; 4926 auth_skipped = 0; 4927 } 4928 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4929 /* 4930 * Restart the timer if we have 4931 * pending data 4932 */ 4933 struct sctp_tmit_chunk *chk; 4934 4935 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4936 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4937 } 4938 } 4939 break; 4940 case SCTP_COOKIE_ACK: 4941 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4942 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4943 if (locked_tcb) { 4944 SCTP_TCB_UNLOCK(locked_tcb); 4945 } 4946 return (NULL); 4947 } 4948 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4949 /* We are not interested anymore */ 4950 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4951 ; 4952 } else if (stcb) { 4953 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4954 so = SCTP_INP_SO(inp); 4955 atomic_add_int(&stcb->asoc.refcnt, 1); 4956 SCTP_TCB_UNLOCK(stcb); 4957 SCTP_SOCKET_LOCK(so, 1); 4958 SCTP_TCB_LOCK(stcb); 4959 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4960 #endif 4961 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4962 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4963 SCTP_SOCKET_UNLOCK(so, 1); 4964 #endif 4965 *offset = length; 4966 return (NULL); 4967 } 4968 } 4969 /* He's alive so give him credit */ 4970 if ((stcb) && netp && *netp) { 4971 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4972 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4973 stcb->asoc.overall_error_count, 4974 0, 4975 SCTP_FROM_SCTP_INPUT, 4976 __LINE__); 4977 } 4978 stcb->asoc.overall_error_count = 0; 4979 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4980 } 4981 break; 4982 case SCTP_ECN_ECHO: 4983 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4984 /* He's alive so give him credit */ 4985 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4986 /* Its not ours */ 4987 if (locked_tcb) { 4988 SCTP_TCB_UNLOCK(locked_tcb); 4989 } 4990 *offset = length; 4991 return (NULL); 4992 } 4993 if (stcb) { 4994 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4995 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4996 stcb->asoc.overall_error_count, 4997 0, 4998 SCTP_FROM_SCTP_INPUT, 4999 __LINE__); 5000 } 5001 stcb->asoc.overall_error_count = 0; 5002 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5003 stcb); 5004 } 5005 break; 5006 case SCTP_ECN_CWR: 5007 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5008 /* He's alive so give him credit */ 5009 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5010 /* Its not ours */ 5011 if (locked_tcb) { 5012 SCTP_TCB_UNLOCK(locked_tcb); 5013 } 5014 *offset = length; 5015 return (NULL); 5016 } 5017 if (stcb) { 5018 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5019 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5020 stcb->asoc.overall_error_count, 5021 0, 5022 SCTP_FROM_SCTP_INPUT, 5023 __LINE__); 5024 } 5025 stcb->asoc.overall_error_count = 0; 5026 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5027 } 5028 break; 5029 case SCTP_SHUTDOWN_COMPLETE: 5030 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5031 /* must be first and only chunk */ 5032 if ((num_chunks > 1) || 5033 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5034 *offset = length; 5035 if (locked_tcb) { 5036 SCTP_TCB_UNLOCK(locked_tcb); 5037 } 5038 return (NULL); 5039 } 5040 if ((stcb) && netp && *netp) { 5041 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5042 stcb, *netp); 5043 } 5044 *offset = length; 5045 return (NULL); 5046 break; 5047 case SCTP_ASCONF: 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5049 /* He's alive so give him credit */ 5050 if (stcb) { 5051 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5052 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5053 stcb->asoc.overall_error_count, 5054 0, 5055 SCTP_FROM_SCTP_INPUT, 5056 __LINE__); 5057 } 5058 stcb->asoc.overall_error_count = 0; 5059 sctp_handle_asconf(m, *offset, 5060 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5061 asconf_cnt++; 5062 } 5063 break; 5064 case SCTP_ASCONF_ACK: 5065 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5066 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5067 /* Its not ours */ 5068 if (locked_tcb) { 5069 SCTP_TCB_UNLOCK(locked_tcb); 5070 } 5071 *offset = length; 5072 return (NULL); 5073 } 5074 if ((stcb) && netp && *netp) { 5075 /* He's alive so give him credit */ 5076 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5077 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5078 stcb->asoc.overall_error_count, 5079 0, 5080 SCTP_FROM_SCTP_INPUT, 5081 __LINE__); 5082 } 5083 stcb->asoc.overall_error_count = 0; 5084 sctp_handle_asconf_ack(m, *offset, 5085 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5086 if (abort_no_unlock) 5087 return (NULL); 5088 } 5089 break; 5090 case SCTP_FORWARD_CUM_TSN: 5091 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5092 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5093 /* Its not ours */ 5094 if (locked_tcb) { 5095 SCTP_TCB_UNLOCK(locked_tcb); 5096 } 5097 *offset = length; 5098 return (NULL); 5099 } 5100 /* He's alive so give him credit */ 5101 if (stcb) { 5102 int abort_flag = 0; 5103 5104 stcb->asoc.overall_error_count = 0; 5105 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5106 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5107 stcb->asoc.overall_error_count, 5108 0, 5109 SCTP_FROM_SCTP_INPUT, 5110 __LINE__); 5111 } 5112 *fwd_tsn_seen = 1; 5113 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5114 /* We are not interested anymore */ 5115 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5116 so = SCTP_INP_SO(inp); 5117 atomic_add_int(&stcb->asoc.refcnt, 1); 5118 SCTP_TCB_UNLOCK(stcb); 5119 SCTP_SOCKET_LOCK(so, 1); 5120 SCTP_TCB_LOCK(stcb); 5121 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5122 #endif 5123 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5124 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5125 SCTP_SOCKET_UNLOCK(so, 1); 5126 #endif 5127 *offset = length; 5128 return (NULL); 5129 } 5130 sctp_handle_forward_tsn(stcb, 5131 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5132 if (abort_flag) { 5133 *offset = length; 5134 return (NULL); 5135 } else { 5136 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5137 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5138 stcb->asoc.overall_error_count, 5139 0, 5140 SCTP_FROM_SCTP_INPUT, 5141 __LINE__); 5142 } 5143 stcb->asoc.overall_error_count = 0; 5144 } 5145 5146 } 5147 break; 5148 case SCTP_STREAM_RESET: 5149 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5150 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5151 /* Its not ours */ 5152 if (locked_tcb) { 5153 SCTP_TCB_UNLOCK(locked_tcb); 5154 } 5155 *offset = length; 5156 return (NULL); 5157 } 5158 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5159 /* We are not interested anymore */ 5160 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5161 so = SCTP_INP_SO(inp); 5162 atomic_add_int(&stcb->asoc.refcnt, 1); 5163 SCTP_TCB_UNLOCK(stcb); 5164 SCTP_SOCKET_LOCK(so, 1); 5165 SCTP_TCB_LOCK(stcb); 5166 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5167 #endif 5168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5169 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5170 SCTP_SOCKET_UNLOCK(so, 1); 5171 #endif 5172 *offset = length; 5173 return (NULL); 5174 } 5175 if (stcb->asoc.peer_supports_strreset == 0) { 5176 /* 5177 * hmm, peer should have announced this, but 5178 * we will turn it on since he is sending us 5179 * a stream reset. 5180 */ 5181 stcb->asoc.peer_supports_strreset = 1; 5182 } 5183 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5184 /* stop processing */ 5185 *offset = length; 5186 return (NULL); 5187 } 5188 break; 5189 case SCTP_PACKET_DROPPED: 5190 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5191 /* re-get it all please */ 5192 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5193 /* Its not ours */ 5194 if (locked_tcb) { 5195 SCTP_TCB_UNLOCK(locked_tcb); 5196 } 5197 *offset = length; 5198 return (NULL); 5199 } 5200 if (ch && (stcb) && netp && (*netp)) { 5201 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5202 stcb, *netp, 5203 min(chk_length, (sizeof(chunk_buf) - 4))); 5204 5205 } 5206 break; 5207 5208 case SCTP_AUTHENTICATION: 5209 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5210 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5211 goto unknown_chunk; 5212 5213 if (stcb == NULL) { 5214 /* save the first AUTH for later processing */ 5215 if (auth_skipped == 0) { 5216 auth_offset = *offset; 5217 auth_len = chk_length; 5218 auth_skipped = 1; 5219 } 5220 /* skip this chunk (temporarily) */ 5221 goto next_chunk; 5222 } 5223 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5224 (chk_length > (sizeof(struct sctp_auth_chunk) + 5225 SCTP_AUTH_DIGEST_LEN_MAX))) { 5226 /* Its not ours */ 5227 if (locked_tcb) { 5228 SCTP_TCB_UNLOCK(locked_tcb); 5229 } 5230 *offset = length; 5231 return (NULL); 5232 } 5233 if (got_auth == 1) { 5234 /* skip this chunk... it's already auth'd */ 5235 goto next_chunk; 5236 } 5237 got_auth = 1; 5238 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5239 m, *offset)) { 5240 /* auth HMAC failed so dump the packet */ 5241 *offset = length; 5242 return (stcb); 5243 } else { 5244 /* remaining chunks are HMAC checked */ 5245 stcb->asoc.authenticated = 1; 5246 } 5247 break; 5248 5249 default: 5250 unknown_chunk: 5251 /* it's an unknown chunk! */ 5252 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5253 struct mbuf *mm; 5254 struct sctp_paramhdr *phd; 5255 5256 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5257 0, M_DONTWAIT, 1, MT_DATA); 5258 if (mm) { 5259 phd = mtod(mm, struct sctp_paramhdr *); 5260 /* 5261 * We cheat and use param type since 5262 * we did not bother to define a 5263 * error cause struct. They are the 5264 * same basic format with different 5265 * names. 5266 */ 5267 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5268 phd->param_length = htons(chk_length + sizeof(*phd)); 5269 SCTP_BUF_LEN(mm) = sizeof(*phd); 5270 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5271 M_DONTWAIT); 5272 if (SCTP_BUF_NEXT(mm)) { 5273 #ifdef SCTP_MBUF_LOGGING 5274 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5275 struct mbuf *mat; 5276 5277 mat = SCTP_BUF_NEXT(mm); 5278 while (mat) { 5279 if (SCTP_BUF_IS_EXTENDED(mat)) { 5280 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5281 } 5282 mat = SCTP_BUF_NEXT(mat); 5283 } 5284 } 5285 #endif 5286 sctp_queue_op_err(stcb, mm); 5287 } else { 5288 sctp_m_freem(mm); 5289 } 5290 } 5291 } 5292 if ((ch->chunk_type & 0x80) == 0) { 5293 /* discard this packet */ 5294 *offset = length; 5295 return (stcb); 5296 } /* else skip this bad chunk and continue... */ 5297 break; 5298 } /* switch (ch->chunk_type) */ 5299 5300 5301 next_chunk: 5302 /* get the next chunk */ 5303 *offset += SCTP_SIZE32(chk_length); 5304 if (*offset >= length) { 5305 /* no more data left in the mbuf chain */ 5306 break; 5307 } 5308 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5309 sizeof(struct sctp_chunkhdr), chunk_buf); 5310 if (ch == NULL) { 5311 if (locked_tcb) { 5312 SCTP_TCB_UNLOCK(locked_tcb); 5313 } 5314 *offset = length; 5315 return (NULL); 5316 } 5317 } /* while */ 5318 5319 if (asconf_cnt > 0 && stcb != NULL) { 5320 sctp_send_asconf_ack(stcb); 5321 } 5322 return (stcb); 5323 } 5324 5325 5326 /* 5327 * Process the ECN bits we have something set so we must look to see if it is 5328 * ECN(0) or ECN(1) or CE 5329 */ 5330 static void 5331 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5332 uint8_t ecn_bits) 5333 { 5334 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5335 ; 5336 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5337 /* 5338 * we only add to the nonce sum for ECT1, ECT0 does not 5339 * change the NS bit (that we have yet to find a way to send 5340 * it yet). 5341 */ 5342 5343 /* ECN Nonce stuff */ 5344 stcb->asoc.receiver_nonce_sum++; 5345 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5346 5347 /* 5348 * Drag up the last_echo point if cumack is larger since we 5349 * don't want the point falling way behind by more than 5350 * 2^^31 and then having it be incorrect. 5351 */ 5352 if (SCTP_TSN_GT(stcb->asoc.cumulative_tsn, stcb->asoc.last_echo_tsn)) { 5353 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5354 } 5355 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5356 /* 5357 * Drag up the last_echo point if cumack is larger since we 5358 * don't want the point falling way behind by more than 5359 * 2^^31 and then having it be incorrect. 5360 */ 5361 if (SCTP_TSN_GT(stcb->asoc.cumulative_tsn, stcb->asoc.last_echo_tsn)) { 5362 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5363 } 5364 } 5365 } 5366 5367 static void 5368 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5369 uint32_t high_tsn, uint8_t ecn_bits) 5370 { 5371 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5372 /* 5373 * we possibly must notify the sender that a congestion 5374 * window reduction is in order. We do this by adding a ECNE 5375 * chunk to the output chunk queue. The incoming CWR will 5376 * remove this chunk. 5377 */ 5378 if (SCTP_TSN_GT(high_tsn, stcb->asoc.last_echo_tsn)) { 5379 /* Yep, we need to add a ECNE */ 5380 sctp_send_ecn_echo(stcb, net, high_tsn); 5381 stcb->asoc.last_echo_tsn = high_tsn; 5382 } 5383 } 5384 } 5385 5386 #ifdef INVARIANTS 5387 #ifdef __GNUC__ 5388 __attribute__((noinline)) 5389 #endif 5390 void 5391 sctp_validate_no_locks(struct sctp_inpcb *inp) 5392 { 5393 struct sctp_tcb *lstcb; 5394 5395 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5396 if (mtx_owned(&lstcb->tcb_mtx)) { 5397 panic("Own lock on stcb at return from input"); 5398 } 5399 } 5400 if (mtx_owned(&inp->inp_create_mtx)) { 5401 panic("Own create lock on inp"); 5402 } 5403 if (mtx_owned(&inp->inp_mtx)) { 5404 panic("Own inp lock on inp"); 5405 } 5406 } 5407 5408 #endif 5409 5410 /* 5411 * common input chunk processing (v4 and v6) 5412 */ 5413 void 5414 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5415 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5416 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5417 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5418 { 5419 /* 5420 * Control chunk processing 5421 */ 5422 uint32_t high_tsn; 5423 int fwd_tsn_seen = 0, data_processed = 0; 5424 struct mbuf *m = *mm; 5425 int abort_flag = 0; 5426 int un_sent; 5427 5428 SCTP_STAT_INCR(sctps_recvdatagrams); 5429 #ifdef SCTP_AUDITING_ENABLED 5430 sctp_audit_log(0xE0, 1); 5431 sctp_auditing(0, inp, stcb, net); 5432 #endif 5433 5434 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5435 m, iphlen, offset, length, stcb); 5436 if (stcb) { 5437 /* always clear this before beginning a packet */ 5438 stcb->asoc.authenticated = 0; 5439 stcb->asoc.seen_a_sack_this_pkt = 0; 5440 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5441 stcb, stcb->asoc.state); 5442 5443 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5444 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5445 /*- 5446 * If we hit here, we had a ref count 5447 * up when the assoc was aborted and the 5448 * timer is clearing out the assoc, we should 5449 * NOT respond to any packet.. its OOTB. 5450 */ 5451 SCTP_TCB_UNLOCK(stcb); 5452 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5453 vrf_id, port); 5454 goto out_now; 5455 } 5456 } 5457 if (IS_SCTP_CONTROL(ch)) { 5458 /* process the control portion of the SCTP packet */ 5459 /* sa_ignore NO_NULL_CHK */ 5460 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5461 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5462 if (stcb) { 5463 /* 5464 * This covers us if the cookie-echo was there and 5465 * it changes our INP. 5466 */ 5467 inp = stcb->sctp_ep; 5468 if ((net) && (port)) { 5469 if (net->port == 0) { 5470 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5471 } 5472 net->port = port; 5473 } 5474 } 5475 } else { 5476 /* 5477 * no control chunks, so pre-process DATA chunks (these 5478 * checks are taken care of by control processing) 5479 */ 5480 5481 /* 5482 * if DATA only packet, and auth is required, then punt... 5483 * can't have authenticated without any AUTH (control) 5484 * chunks 5485 */ 5486 if ((stcb != NULL) && 5487 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5488 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5489 /* "silently" ignore */ 5490 SCTP_STAT_INCR(sctps_recvauthmissing); 5491 SCTP_TCB_UNLOCK(stcb); 5492 goto out_now; 5493 } 5494 if (stcb == NULL) { 5495 /* out of the blue DATA chunk */ 5496 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5497 vrf_id, port); 5498 goto out_now; 5499 } 5500 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5501 /* v_tag mismatch! */ 5502 SCTP_STAT_INCR(sctps_badvtag); 5503 SCTP_TCB_UNLOCK(stcb); 5504 goto out_now; 5505 } 5506 } 5507 5508 if (stcb == NULL) { 5509 /* 5510 * no valid TCB for this packet, or we found it's a bad 5511 * packet while processing control, or we're done with this 5512 * packet (done or skip rest of data), so we drop it... 5513 */ 5514 goto out_now; 5515 } 5516 /* 5517 * DATA chunk processing 5518 */ 5519 /* plow through the data chunks while length > offset */ 5520 5521 /* 5522 * Rest should be DATA only. Check authentication state if AUTH for 5523 * DATA is required. 5524 */ 5525 if ((length > offset) && 5526 (stcb != NULL) && 5527 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5528 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5529 !stcb->asoc.authenticated) { 5530 /* "silently" ignore */ 5531 SCTP_STAT_INCR(sctps_recvauthmissing); 5532 SCTPDBG(SCTP_DEBUG_AUTH1, 5533 "Data chunk requires AUTH, skipped\n"); 5534 goto trigger_send; 5535 } 5536 if (length > offset) { 5537 int retval; 5538 5539 /* 5540 * First check to make sure our state is correct. We would 5541 * not get here unless we really did have a tag, so we don't 5542 * abort if this happens, just dump the chunk silently. 5543 */ 5544 switch (SCTP_GET_STATE(&stcb->asoc)) { 5545 case SCTP_STATE_COOKIE_ECHOED: 5546 /* 5547 * we consider data with valid tags in this state 5548 * shows us the cookie-ack was lost. Imply it was 5549 * there. 5550 */ 5551 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5552 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5553 stcb->asoc.overall_error_count, 5554 0, 5555 SCTP_FROM_SCTP_INPUT, 5556 __LINE__); 5557 } 5558 stcb->asoc.overall_error_count = 0; 5559 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5560 break; 5561 case SCTP_STATE_COOKIE_WAIT: 5562 /* 5563 * We consider OOTB any data sent during asoc setup. 5564 */ 5565 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5566 vrf_id, port); 5567 SCTP_TCB_UNLOCK(stcb); 5568 goto out_now; 5569 /* sa_ignore NOTREACHED */ 5570 break; 5571 case SCTP_STATE_EMPTY: /* should not happen */ 5572 case SCTP_STATE_INUSE: /* should not happen */ 5573 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5574 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5575 default: 5576 SCTP_TCB_UNLOCK(stcb); 5577 goto out_now; 5578 /* sa_ignore NOTREACHED */ 5579 break; 5580 case SCTP_STATE_OPEN: 5581 case SCTP_STATE_SHUTDOWN_SENT: 5582 break; 5583 } 5584 /* take care of ECN, part 1. */ 5585 if (stcb->asoc.ecn_allowed && 5586 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5587 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5588 } 5589 /* plow through the data chunks while length > offset */ 5590 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5591 inp, stcb, net, &high_tsn); 5592 if (retval == 2) { 5593 /* 5594 * The association aborted, NO UNLOCK needed since 5595 * the association is destroyed. 5596 */ 5597 goto out_now; 5598 } 5599 data_processed = 1; 5600 if (retval == 0) { 5601 /* take care of ecn part 2. */ 5602 if (stcb->asoc.ecn_allowed && 5603 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5604 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5605 ecn_bits); 5606 } 5607 } 5608 /* 5609 * Anything important needs to have been m_copy'ed in 5610 * process_data 5611 */ 5612 } 5613 if ((data_processed == 0) && (fwd_tsn_seen)) { 5614 int was_a_gap; 5615 uint32_t highest_tsn; 5616 5617 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5618 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5619 } else { 5620 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5621 } 5622 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5623 stcb->asoc.send_sack = 1; 5624 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5625 if (abort_flag) { 5626 /* Again, we aborted so NO UNLOCK needed */ 5627 goto out_now; 5628 } 5629 } else if (fwd_tsn_seen) { 5630 stcb->asoc.send_sack = 1; 5631 } 5632 /* trigger send of any chunks in queue... */ 5633 trigger_send: 5634 #ifdef SCTP_AUDITING_ENABLED 5635 sctp_audit_log(0xE0, 2); 5636 sctp_auditing(1, inp, stcb, net); 5637 #endif 5638 SCTPDBG(SCTP_DEBUG_INPUT1, 5639 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5640 stcb->asoc.peers_rwnd, 5641 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5642 stcb->asoc.total_flight); 5643 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5644 5645 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5646 ((un_sent) && 5647 (stcb->asoc.peers_rwnd > 0 || 5648 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5649 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5650 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5651 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5652 } 5653 #ifdef SCTP_AUDITING_ENABLED 5654 sctp_audit_log(0xE0, 3); 5655 sctp_auditing(2, inp, stcb, net); 5656 #endif 5657 SCTP_TCB_UNLOCK(stcb); 5658 out_now: 5659 #ifdef INVARIANTS 5660 sctp_validate_no_locks(inp); 5661 #endif 5662 return; 5663 } 5664 5665 #if 0 5666 static void 5667 sctp_print_mbuf_chain(struct mbuf *m) 5668 { 5669 for (; m; m = SCTP_BUF_NEXT(m)) { 5670 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5671 if (SCTP_BUF_IS_EXTENDED(m)) 5672 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5673 } 5674 } 5675 5676 #endif 5677 5678 void 5679 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5680 { 5681 #ifdef SCTP_MBUF_LOGGING 5682 struct mbuf *mat; 5683 5684 #endif 5685 struct mbuf *m; 5686 int iphlen; 5687 uint32_t vrf_id = 0; 5688 uint8_t ecn_bits; 5689 struct ip *ip; 5690 struct sctphdr *sh; 5691 struct sctp_inpcb *inp = NULL; 5692 struct sctp_nets *net; 5693 struct sctp_tcb *stcb = NULL; 5694 struct sctp_chunkhdr *ch; 5695 int refcount_up = 0; 5696 int length, mlen, offset; 5697 5698 #if !defined(SCTP_WITH_NO_CSUM) 5699 uint32_t check, calc_check; 5700 5701 #endif 5702 5703 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5704 SCTP_RELEASE_PKT(i_pak); 5705 return; 5706 } 5707 mlen = SCTP_HEADER_LEN(i_pak); 5708 iphlen = off; 5709 m = SCTP_HEADER_TO_CHAIN(i_pak); 5710 5711 net = NULL; 5712 SCTP_STAT_INCR(sctps_recvpackets); 5713 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5714 5715 5716 #ifdef SCTP_MBUF_LOGGING 5717 /* Log in any input mbufs */ 5718 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5719 mat = m; 5720 while (mat) { 5721 if (SCTP_BUF_IS_EXTENDED(mat)) { 5722 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5723 } 5724 mat = SCTP_BUF_NEXT(mat); 5725 } 5726 } 5727 #endif 5728 #ifdef SCTP_PACKET_LOGGING 5729 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5730 sctp_packet_log(m, mlen); 5731 #endif 5732 /* 5733 * Must take out the iphlen, since mlen expects this (only effect lb 5734 * case) 5735 */ 5736 mlen -= iphlen; 5737 5738 /* 5739 * Get IP, SCTP, and first chunk header together in first mbuf. 5740 */ 5741 ip = mtod(m, struct ip *); 5742 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5743 if (SCTP_BUF_LEN(m) < offset) { 5744 if ((m = m_pullup(m, offset)) == 0) { 5745 SCTP_STAT_INCR(sctps_hdrops); 5746 return; 5747 } 5748 ip = mtod(m, struct ip *); 5749 } 5750 /* validate mbuf chain length with IP payload length */ 5751 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5752 SCTP_STAT_INCR(sctps_hdrops); 5753 goto bad; 5754 } 5755 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5756 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5757 SCTPDBG(SCTP_DEBUG_INPUT1, 5758 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5759 5760 /* SCTP does not allow broadcasts or multicasts */ 5761 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5762 goto bad; 5763 } 5764 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5765 /* 5766 * We only look at broadcast if its a front state, All 5767 * others we will not have a tcb for anyway. 5768 */ 5769 goto bad; 5770 } 5771 /* validate SCTP checksum */ 5772 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5773 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5774 m->m_pkthdr.len, 5775 if_name(m->m_pkthdr.rcvif), 5776 m->m_pkthdr.csum_flags); 5777 #if defined(SCTP_WITH_NO_CSUM) 5778 SCTP_STAT_INCR(sctps_recvnocrc); 5779 #else 5780 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5781 SCTP_STAT_INCR(sctps_recvhwcrc); 5782 goto sctp_skip_csum_4; 5783 } 5784 check = sh->checksum; /* save incoming checksum */ 5785 sh->checksum = 0; /* prepare for calc */ 5786 calc_check = sctp_calculate_cksum(m, iphlen); 5787 sh->checksum = check; 5788 SCTP_STAT_INCR(sctps_recvswcrc); 5789 if (calc_check != check) { 5790 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5791 calc_check, check, m, mlen, iphlen); 5792 5793 stcb = sctp_findassociation_addr(m, iphlen, 5794 offset - sizeof(*ch), 5795 sh, ch, &inp, &net, 5796 vrf_id); 5797 if ((net) && (port)) { 5798 if (net->port == 0) { 5799 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5800 } 5801 net->port = port; 5802 } 5803 if ((inp) && (stcb)) { 5804 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5805 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5806 } else if ((inp != NULL) && (stcb == NULL)) { 5807 refcount_up = 1; 5808 } 5809 SCTP_STAT_INCR(sctps_badsum); 5810 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5811 goto bad; 5812 } 5813 sctp_skip_csum_4: 5814 #endif 5815 /* destination port of 0 is illegal, based on RFC2960. */ 5816 if (sh->dest_port == 0) { 5817 SCTP_STAT_INCR(sctps_hdrops); 5818 goto bad; 5819 } 5820 /* 5821 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5822 * IP/SCTP/first chunk header... 5823 */ 5824 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5825 sh, ch, &inp, &net, vrf_id); 5826 if ((net) && (port)) { 5827 if (net->port == 0) { 5828 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5829 } 5830 net->port = port; 5831 } 5832 /* inp's ref-count increased && stcb locked */ 5833 if (inp == NULL) { 5834 struct sctp_init_chunk *init_chk, chunk_buf; 5835 5836 SCTP_STAT_INCR(sctps_noport); 5837 #ifdef ICMP_BANDLIM 5838 /* 5839 * we use the bandwidth limiting to protect against sending 5840 * too many ABORTS all at once. In this case these count the 5841 * same as an ICMP message. 5842 */ 5843 if (badport_bandlim(0) < 0) 5844 goto bad; 5845 #endif /* ICMP_BANDLIM */ 5846 SCTPDBG(SCTP_DEBUG_INPUT1, 5847 "Sending a ABORT from packet entry!\n"); 5848 if (ch->chunk_type == SCTP_INITIATION) { 5849 /* 5850 * we do a trick here to get the INIT tag, dig in 5851 * and get the tag from the INIT and put it in the 5852 * common header. 5853 */ 5854 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5855 iphlen + sizeof(*sh), sizeof(*init_chk), 5856 (uint8_t *) & chunk_buf); 5857 if (init_chk != NULL) 5858 sh->v_tag = init_chk->init.initiate_tag; 5859 } 5860 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5861 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5862 goto bad; 5863 } 5864 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5865 goto bad; 5866 } 5867 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5868 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5869 goto bad; 5870 } else if (stcb == NULL) { 5871 refcount_up = 1; 5872 } 5873 #ifdef IPSEC 5874 /* 5875 * I very much doubt any of the IPSEC stuff will work but I have no 5876 * idea, so I will leave it in place. 5877 */ 5878 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5879 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5880 SCTP_STAT_INCR(sctps_hdrops); 5881 goto bad; 5882 } 5883 #endif /* IPSEC */ 5884 5885 /* 5886 * common chunk processing 5887 */ 5888 length = ip->ip_len + iphlen; 5889 offset -= sizeof(struct sctp_chunkhdr); 5890 5891 ecn_bits = ip->ip_tos; 5892 5893 /* sa_ignore NO_NULL_CHK */ 5894 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5895 inp, stcb, net, ecn_bits, vrf_id, port); 5896 /* inp's ref-count reduced && stcb unlocked */ 5897 if (m) { 5898 sctp_m_freem(m); 5899 } 5900 if ((inp) && (refcount_up)) { 5901 /* reduce ref-count */ 5902 SCTP_INP_DECR_REF(inp); 5903 } 5904 return; 5905 bad: 5906 if (stcb) { 5907 SCTP_TCB_UNLOCK(stcb); 5908 } 5909 if ((inp) && (refcount_up)) { 5910 /* reduce ref-count */ 5911 SCTP_INP_DECR_REF(inp); 5912 } 5913 if (m) { 5914 sctp_m_freem(m); 5915 } 5916 return; 5917 } 5918 void 5919 sctp_input(i_pak, off) 5920 struct mbuf *i_pak; 5921 int off; 5922 { 5923 sctp_input_with_port(i_pak, off, 0); 5924 } 5925