1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #include <netinet/udp.h> 51 52 53 54 static void 55 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 56 { 57 struct sctp_nets *net; 58 59 /* 60 * This now not only stops all cookie timers it also stops any INIT 61 * timers as well. This will make sure that the timers are stopped 62 * in all collision cases. 63 */ 64 SCTP_TCB_LOCK_ASSERT(stcb); 65 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 66 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 67 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 68 stcb->sctp_ep, 69 stcb, 70 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 71 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 76 } 77 } 78 } 79 80 /* INIT handler */ 81 static void 82 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 83 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 84 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 85 { 86 struct sctp_init *init; 87 struct mbuf *op_err; 88 uint32_t init_limit; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 95 goto outnow; 96 } 97 } 98 op_err = NULL; 99 init = &cp->init; 100 /* First are we accepting? */ 101 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 102 SCTPDBG(SCTP_DEBUG_INPUT2, 103 "sctp_handle_init: Abort, so_qlimit:%d\n", 104 inp->sctp_socket->so_qlimit); 105 /* 106 * FIX ME ?? What about TCP model and we have a 107 * match/restart case? Actually no fix is needed. the lookup 108 * will always find the existing assoc so stcb would not be 109 * NULL. It may be questionable to do this since we COULD 110 * just send back the INIT-ACK and hope that the app did 111 * accept()'s by the time the COOKIE was sent. But there is 112 * a price to pay for COOKIE generation and I don't want to 113 * pay it on the chance that the app will actually do some 114 * accepts(). The App just looses and should NOT be in this 115 * state :-) 116 */ 117 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 124 /* Invalid length */ 125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 126 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 /* validate parameters */ 133 if (init->initiate_tag == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 143 /* invalid parameter... send abort */ 144 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 145 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 146 vrf_id, port); 147 if (stcb) 148 *abort_no_unlock = 1; 149 goto outnow; 150 } 151 if (init->num_inbound_streams == 0) { 152 /* protocol error... send abort */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 if (init->num_outbound_streams == 0) { 161 /* protocol error... send abort */ 162 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 163 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 164 vrf_id, port); 165 if (stcb) 166 *abort_no_unlock = 1; 167 goto outnow; 168 } 169 init_limit = offset + ntohs(cp->ch.chunk_length); 170 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 171 init_limit)) { 172 /* auth parameter(s) error... send abort */ 173 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 174 if (stcb) 175 *abort_no_unlock = 1; 176 goto outnow; 177 } 178 /* send an INIT-ACK w/cookie */ 179 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 180 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 181 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 182 outnow: 183 if (stcb == NULL) { 184 SCTP_INP_RUNLOCK(inp); 185 } 186 } 187 188 /* 189 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 190 */ 191 192 int 193 sctp_is_there_unsent_data(struct sctp_tcb *stcb) 194 { 195 int unsent_data = 0; 196 struct sctp_stream_queue_pending *sp; 197 struct sctp_stream_out *strq; 198 struct sctp_association *asoc; 199 200 /* 201 * This function returns the number of streams that have true unsent 202 * data on them. Note that as it looks through it will clean up any 203 * places that have old data that has been sent but left at top of 204 * stream queue. 205 */ 206 asoc = &stcb->asoc; 207 SCTP_TCB_SEND_LOCK(stcb); 208 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 209 /* Check to see if some data queued */ 210 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 211 is_there_another: 212 /* sa_ignore FREED_MEMORY */ 213 sp = TAILQ_FIRST(&strq->outqueue); 214 if (sp == NULL) { 215 continue; 216 } 217 if ((sp->msg_is_complete) && 218 (sp->length == 0) && 219 (sp->sender_all_done)) { 220 /* 221 * We are doing differed cleanup. Last time 222 * through when we took all the data the 223 * sender_all_done was not set. 224 */ 225 if (sp->put_last_out == 0) { 226 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 227 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 228 sp->sender_all_done, 229 sp->length, 230 sp->msg_is_complete, 231 sp->put_last_out); 232 } 233 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 234 TAILQ_REMOVE(&strq->outqueue, sp, next); 235 sctp_free_remote_addr(sp->net); 236 if (sp->data) { 237 sctp_m_freem(sp->data); 238 sp->data = NULL; 239 } 240 sctp_free_a_strmoq(stcb, sp); 241 goto is_there_another; 242 } else { 243 unsent_data++; 244 continue; 245 } 246 } 247 } 248 SCTP_TCB_SEND_UNLOCK(stcb); 249 return (unsent_data); 250 } 251 252 static int 253 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 254 struct sctp_nets *net) 255 { 256 struct sctp_init *init; 257 struct sctp_association *asoc; 258 struct sctp_nets *lnet; 259 unsigned int i; 260 261 init = &cp->init; 262 asoc = &stcb->asoc; 263 /* save off parameters */ 264 asoc->peer_vtag = ntohl(init->initiate_tag); 265 asoc->peers_rwnd = ntohl(init->a_rwnd); 266 if (TAILQ_FIRST(&asoc->nets)) { 267 /* update any ssthresh's that may have a default */ 268 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 269 lnet->ssthresh = asoc->peers_rwnd; 270 271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 272 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 273 } 274 } 275 } 276 SCTP_TCB_SEND_LOCK(stcb); 277 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 278 unsigned int newcnt; 279 struct sctp_stream_out *outs; 280 struct sctp_stream_queue_pending *sp; 281 struct sctp_tmit_chunk *chk, *chk_next; 282 283 /* abandon the upper streams */ 284 newcnt = ntohs(init->num_inbound_streams); 285 if (!TAILQ_EMPTY(&asoc->send_queue)) { 286 chk = TAILQ_FIRST(&asoc->send_queue); 287 while (chk) { 288 chk_next = TAILQ_NEXT(chk, sctp_next); 289 if (chk->rec.data.stream_number >= newcnt) { 290 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 291 asoc->send_queue_cnt--; 292 if (chk->data != NULL) { 293 sctp_free_bufspace(stcb, asoc, chk, 1); 294 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 295 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 296 if (chk->data) { 297 sctp_m_freem(chk->data); 298 chk->data = NULL; 299 } 300 } 301 sctp_free_a_chunk(stcb, chk); 302 /* sa_ignore FREED_MEMORY */ 303 } 304 chk = chk_next; 305 } 306 } 307 if (asoc->strmout) { 308 for (i = newcnt; i < asoc->pre_open_streams; i++) { 309 outs = &asoc->strmout[i]; 310 sp = TAILQ_FIRST(&outs->outqueue); 311 while (sp) { 312 TAILQ_REMOVE(&outs->outqueue, sp, next); 313 asoc->stream_queue_cnt--; 314 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 315 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 316 sp, SCTP_SO_NOT_LOCKED); 317 if (sp->data) { 318 sctp_m_freem(sp->data); 319 sp->data = NULL; 320 } 321 sctp_free_remote_addr(sp->net); 322 sp->net = NULL; 323 /* Free the chunk */ 324 sctp_free_a_strmoq(stcb, sp); 325 /* sa_ignore FREED_MEMORY */ 326 sp = TAILQ_FIRST(&outs->outqueue); 327 } 328 } 329 } 330 /* cut back the count */ 331 asoc->pre_open_streams = newcnt; 332 } 333 SCTP_TCB_SEND_UNLOCK(stcb); 334 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 335 /* init tsn's */ 336 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 337 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 338 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 339 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 340 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 341 } 342 /* This is the next one we expect */ 343 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 344 345 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 346 /* 347 * EY 05/13/08 - nr_sack: initialize nr_mapping array's base tsn 348 * like above 349 */ 350 asoc->nr_mapping_array_base_tsn = ntohl(init->initial_tsn); 351 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 352 asoc->last_echo_tsn = asoc->asconf_seq_in; 353 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 354 /* open the requested streams */ 355 356 if (asoc->strmin != NULL) { 357 /* Free the old ones */ 358 struct sctp_queued_to_read *ctl; 359 360 for (i = 0; i < asoc->streamincnt; i++) { 361 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 362 while (ctl) { 363 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 364 sctp_free_remote_addr(ctl->whoFrom); 365 ctl->whoFrom = NULL; 366 sctp_m_freem(ctl->data); 367 ctl->data = NULL; 368 sctp_free_a_readq(stcb, ctl); 369 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 370 } 371 } 372 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 373 } 374 asoc->streamincnt = ntohs(init->num_outbound_streams); 375 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 376 asoc->streamincnt = MAX_SCTP_STREAMS; 377 } 378 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 379 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 380 if (asoc->strmin == NULL) { 381 /* we didn't get memory for the streams! */ 382 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 383 return (-1); 384 } 385 for (i = 0; i < asoc->streamincnt; i++) { 386 asoc->strmin[i].stream_no = i; 387 asoc->strmin[i].last_sequence_delivered = 0xffff; 388 /* 389 * U-stream ranges will be set when the cookie is unpacked. 390 * Or for the INIT sender they are un set (if pr-sctp not 391 * supported) when the INIT-ACK arrives. 392 */ 393 TAILQ_INIT(&asoc->strmin[i].inqueue); 394 asoc->strmin[i].delivery_started = 0; 395 } 396 /* 397 * load_address_from_init will put the addresses into the 398 * association when the COOKIE is processed or the INIT-ACK is 399 * processed. Both types of COOKIE's existing and new call this 400 * routine. It will remove addresses that are no longer in the 401 * association (for the restarting case where addresses are 402 * removed). Up front when the INIT arrives we will discard it if it 403 * is a restart and new addresses have been added. 404 */ 405 /* sa_ignore MEMLEAK */ 406 return (0); 407 } 408 409 /* 410 * INIT-ACK message processing/consumption returns value < 0 on error 411 */ 412 static int 413 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 414 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 415 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 416 { 417 struct sctp_association *asoc; 418 struct mbuf *op_err; 419 int retval, abort_flag; 420 uint32_t initack_limit; 421 int nat_friendly = 0; 422 423 /* First verify that we have no illegal param's */ 424 abort_flag = 0; 425 op_err = NULL; 426 427 op_err = sctp_arethere_unrecognized_parameters(m, 428 (offset + sizeof(struct sctp_init_chunk)), 429 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 430 if (abort_flag) { 431 /* Send an abort and notify peer */ 432 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 433 *abort_no_unlock = 1; 434 return (-1); 435 } 436 asoc = &stcb->asoc; 437 asoc->peer_supports_nat = (uint8_t) nat_friendly; 438 /* process the peer's parameters in the INIT-ACK */ 439 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 440 if (retval < 0) { 441 return (retval); 442 } 443 initack_limit = offset + ntohs(cp->ch.chunk_length); 444 /* load all addresses */ 445 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 446 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 447 NULL))) { 448 /* Huh, we should abort */ 449 SCTPDBG(SCTP_DEBUG_INPUT1, 450 "Load addresses from INIT causes an abort %d\n", 451 retval); 452 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 453 NULL, 0, net->port); 454 *abort_no_unlock = 1; 455 return (-1); 456 } 457 /* if the peer doesn't support asconf, flush the asconf queue */ 458 if (asoc->peer_supports_asconf == 0) { 459 struct sctp_asconf_addr *aparam; 460 461 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 462 /* sa_ignore FREED_MEMORY */ 463 aparam = TAILQ_FIRST(&asoc->asconf_queue); 464 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 465 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 466 } 467 } 468 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 469 stcb->asoc.local_hmacs); 470 if (op_err) { 471 sctp_queue_op_err(stcb, op_err); 472 /* queuing will steal away the mbuf chain to the out queue */ 473 op_err = NULL; 474 } 475 /* extract the cookie and queue it to "echo" it back... */ 476 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 477 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 478 stcb->asoc.overall_error_count, 479 0, 480 SCTP_FROM_SCTP_INPUT, 481 __LINE__); 482 } 483 stcb->asoc.overall_error_count = 0; 484 net->error_count = 0; 485 486 /* 487 * Cancel the INIT timer, We do this first before queueing the 488 * cookie. We always cancel at the primary to assue that we are 489 * canceling the timer started by the INIT which always goes to the 490 * primary. 491 */ 492 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 493 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 494 495 /* calculate the RTO */ 496 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 497 498 retval = sctp_send_cookie_echo(m, offset, stcb, net); 499 if (retval < 0) { 500 /* 501 * No cookie, we probably should send a op error. But in any 502 * case if there is no cookie in the INIT-ACK, we can 503 * abandon the peer, its broke. 504 */ 505 if (retval == -3) { 506 /* We abort with an error of missing mandatory param */ 507 op_err = 508 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 509 if (op_err) { 510 /* 511 * Expand beyond to include the mandatory 512 * param cookie 513 */ 514 struct sctp_inv_mandatory_param *mp; 515 516 SCTP_BUF_LEN(op_err) = 517 sizeof(struct sctp_inv_mandatory_param); 518 mp = mtod(op_err, 519 struct sctp_inv_mandatory_param *); 520 /* Subtract the reserved param */ 521 mp->length = 522 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 523 mp->num_param = htonl(1); 524 mp->param = htons(SCTP_STATE_COOKIE); 525 mp->resv = 0; 526 } 527 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 528 sh, op_err, 0, net->port); 529 *abort_no_unlock = 1; 530 } 531 return (retval); 532 } 533 return (0); 534 } 535 536 static void 537 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 538 struct sctp_tcb *stcb, struct sctp_nets *net) 539 { 540 struct sockaddr_storage store; 541 struct sockaddr_in *sin; 542 struct sockaddr_in6 *sin6; 543 struct sctp_nets *r_net; 544 struct timeval tv; 545 int req_prim = 0; 546 547 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 548 /* Invalid length */ 549 return; 550 } 551 sin = (struct sockaddr_in *)&store; 552 sin6 = (struct sockaddr_in6 *)&store; 553 554 memset(&store, 0, sizeof(store)); 555 if (cp->heartbeat.hb_info.addr_family == AF_INET && 556 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 557 sin->sin_family = cp->heartbeat.hb_info.addr_family; 558 sin->sin_len = cp->heartbeat.hb_info.addr_len; 559 sin->sin_port = stcb->rport; 560 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 561 sizeof(sin->sin_addr)); 562 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 563 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 564 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 565 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 566 sin6->sin6_port = stcb->rport; 567 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 568 sizeof(sin6->sin6_addr)); 569 } else { 570 return; 571 } 572 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 573 if (r_net == NULL) { 574 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 575 return; 576 } 577 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 578 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 579 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 580 /* 581 * If the its a HB and it's random value is correct when can 582 * confirm the destination. 583 */ 584 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 585 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 586 stcb->asoc.primary_destination = r_net; 587 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 588 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 589 r_net = TAILQ_FIRST(&stcb->asoc.nets); 590 if (r_net != stcb->asoc.primary_destination) { 591 /* 592 * first one on the list is NOT the primary 593 * sctp_cmpaddr() is much more efficent if 594 * the primary is the first on the list, 595 * make it so. 596 */ 597 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 598 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 599 } 600 req_prim = 1; 601 } 602 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 603 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 604 } 605 r_net->error_count = 0; 606 r_net->hb_responded = 1; 607 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 608 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 609 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 610 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 611 r_net->dest_state |= SCTP_ADDR_REACHABLE; 612 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 613 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 614 /* now was it the primary? if so restore */ 615 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 616 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 617 } 618 } 619 /* 620 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 621 * set the destination to active state and set the cwnd to one or 622 * two MTU's based on whether PF1 or PF2 is being used. If a T3 623 * timer is running, for the destination, stop the timer because a 624 * PF-heartbeat was received. 625 */ 626 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 627 SCTP_BASE_SYSCTL(sctp_cmt_pf) && 628 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 629 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 630 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 631 stcb, net, 632 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 633 } 634 net->dest_state &= ~SCTP_ADDR_PF; 635 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 636 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 637 net, net->cwnd); 638 } 639 /* Now lets do a RTO with this */ 640 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 641 /* Mobility adaptation */ 642 if (req_prim) { 643 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 644 SCTP_MOBILITY_BASE) || 645 sctp_is_mobility_feature_on(stcb->sctp_ep, 646 SCTP_MOBILITY_FASTHANDOFF)) && 647 sctp_is_mobility_feature_on(stcb->sctp_ep, 648 SCTP_MOBILITY_PRIM_DELETED)) { 649 650 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 651 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_FASTHANDOFF)) { 653 sctp_assoc_immediate_retrans(stcb, 654 stcb->asoc.primary_destination); 655 } 656 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 657 SCTP_MOBILITY_BASE)) { 658 sctp_move_chunks_from_deleted_prim(stcb, 659 stcb->asoc.primary_destination); 660 } 661 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 662 stcb->asoc.deleted_primary); 663 } 664 } 665 } 666 667 static int 668 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 669 { 670 /* 671 * return 0 means we want you to proceed with the abort non-zero 672 * means no abort processing 673 */ 674 struct sctpasochead *head; 675 676 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 677 /* generate a new vtag and send init */ 678 LIST_REMOVE(stcb, sctp_asocs); 679 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 680 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 681 /* 682 * put it in the bucket in the vtag hash of assoc's for the 683 * system 684 */ 685 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 686 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 687 return (1); 688 } 689 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 690 /* 691 * treat like a case where the cookie expired i.e.: - dump 692 * current cookie. - generate a new vtag. - resend init. 693 */ 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 697 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 698 sctp_stop_all_cookie_timers(stcb); 699 sctp_toss_old_cookies(stcb, &stcb->asoc); 700 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 701 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 702 /* 703 * put it in the bucket in the vtag hash of assoc's for the 704 * system 705 */ 706 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 707 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 708 return (1); 709 } 710 return (0); 711 } 712 713 static int 714 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 715 struct sctp_nets *net) 716 { 717 /* 718 * return 0 means we want you to proceed with the abort non-zero 719 * means no abort processing 720 */ 721 if (stcb->asoc.peer_supports_auth == 0) { 722 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 723 return (0); 724 } 725 sctp_asconf_send_nat_state_update(stcb, net); 726 return (1); 727 } 728 729 730 static void 731 sctp_handle_abort(struct sctp_abort_chunk *cp, 732 struct sctp_tcb *stcb, struct sctp_nets *net) 733 { 734 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 735 struct socket *so; 736 737 #endif 738 uint16_t len; 739 740 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 741 if (stcb == NULL) 742 return; 743 744 len = ntohs(cp->ch.chunk_length); 745 if (len > sizeof(struct sctp_chunkhdr)) { 746 /* 747 * Need to check the cause codes for our two magic nat 748 * aborts which don't kill the assoc necessarily. 749 */ 750 struct sctp_abort_chunk *cpnext; 751 struct sctp_missing_nat_state *natc; 752 uint16_t cause; 753 754 cpnext = cp; 755 cpnext++; 756 natc = (struct sctp_missing_nat_state *)cpnext; 757 cause = ntohs(natc->cause); 758 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 759 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 760 cp->ch.chunk_flags); 761 if (sctp_handle_nat_colliding_state(stcb)) { 762 return; 763 } 764 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 765 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 766 cp->ch.chunk_flags); 767 if (sctp_handle_nat_missing_state(stcb, net)) { 768 return; 769 } 770 } 771 } 772 /* stop any receive timers */ 773 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 774 /* notify user of the abort and clean up... */ 775 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 776 /* free the tcb */ 777 #if defined(SCTP_PANIC_ON_ABORT) 778 printf("stcb:%p state:%d rport:%d net:%p\n", 779 stcb, stcb->asoc.state, stcb->rport, net); 780 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 781 panic("Received an ABORT"); 782 } else { 783 printf("No panic its in state %x closed\n", stcb->asoc.state); 784 } 785 #endif 786 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 787 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 788 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 789 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 790 } 791 #ifdef SCTP_ASOCLOG_OF_TSNS 792 sctp_print_out_track_log(stcb); 793 #endif 794 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 795 so = SCTP_INP_SO(stcb->sctp_ep); 796 atomic_add_int(&stcb->asoc.refcnt, 1); 797 SCTP_TCB_UNLOCK(stcb); 798 SCTP_SOCKET_LOCK(so, 1); 799 SCTP_TCB_LOCK(stcb); 800 atomic_subtract_int(&stcb->asoc.refcnt, 1); 801 #endif 802 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 803 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 804 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 SCTP_SOCKET_UNLOCK(so, 1); 807 #endif 808 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 809 } 810 811 static void 812 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 813 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 814 { 815 struct sctp_association *asoc; 816 int some_on_streamwheel; 817 818 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 819 struct socket *so; 820 821 #endif 822 823 SCTPDBG(SCTP_DEBUG_INPUT2, 824 "sctp_handle_shutdown: handling SHUTDOWN\n"); 825 if (stcb == NULL) 826 return; 827 asoc = &stcb->asoc; 828 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 829 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 830 return; 831 } 832 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 833 /* Shutdown NOT the expected size */ 834 return; 835 } else { 836 sctp_update_acked(stcb, cp, net, abort_flag); 837 if (*abort_flag) { 838 return; 839 } 840 } 841 if (asoc->control_pdapi) { 842 /* 843 * With a normal shutdown we assume the end of last record. 844 */ 845 SCTP_INP_READ_LOCK(stcb->sctp_ep); 846 asoc->control_pdapi->end_added = 1; 847 asoc->control_pdapi->pdapi_aborted = 1; 848 asoc->control_pdapi = NULL; 849 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 850 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 851 so = SCTP_INP_SO(stcb->sctp_ep); 852 atomic_add_int(&stcb->asoc.refcnt, 1); 853 SCTP_TCB_UNLOCK(stcb); 854 SCTP_SOCKET_LOCK(so, 1); 855 SCTP_TCB_LOCK(stcb); 856 atomic_subtract_int(&stcb->asoc.refcnt, 1); 857 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 858 /* assoc was freed while we were unlocked */ 859 SCTP_SOCKET_UNLOCK(so, 1); 860 return; 861 } 862 #endif 863 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 864 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 865 SCTP_SOCKET_UNLOCK(so, 1); 866 #endif 867 } 868 /* goto SHUTDOWN_RECEIVED state to block new requests */ 869 if (stcb->sctp_socket) { 870 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 871 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 872 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 873 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 874 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 875 /* 876 * notify upper layer that peer has initiated a 877 * shutdown 878 */ 879 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 880 881 /* reset time */ 882 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 883 } 884 } 885 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 886 /* 887 * stop the shutdown timer, since we WILL move to 888 * SHUTDOWN-ACK-SENT. 889 */ 890 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 891 } 892 /* Now is there unsent data on a stream somewhere? */ 893 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 894 895 if (!TAILQ_EMPTY(&asoc->send_queue) || 896 !TAILQ_EMPTY(&asoc->sent_queue) || 897 some_on_streamwheel) { 898 /* By returning we will push more data out */ 899 return; 900 } else { 901 /* no outstanding data to send, so move on... */ 902 /* send SHUTDOWN-ACK */ 903 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 904 /* move to SHUTDOWN-ACK-SENT state */ 905 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 906 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 907 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 908 } 909 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 910 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 911 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 912 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 913 /* start SHUTDOWN timer */ 914 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 915 stcb, net); 916 } 917 } 918 919 static void 920 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 921 struct sctp_tcb *stcb, 922 struct sctp_nets *net) 923 { 924 struct sctp_association *asoc; 925 926 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 927 struct socket *so; 928 929 so = SCTP_INP_SO(stcb->sctp_ep); 930 #endif 931 SCTPDBG(SCTP_DEBUG_INPUT2, 932 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 933 if (stcb == NULL) 934 return; 935 936 asoc = &stcb->asoc; 937 /* process according to association state */ 938 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 939 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 940 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 941 sctp_send_shutdown_complete(stcb, net, 1); 942 SCTP_TCB_UNLOCK(stcb); 943 return; 944 } 945 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 946 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 947 /* unexpected SHUTDOWN-ACK... so ignore... */ 948 SCTP_TCB_UNLOCK(stcb); 949 return; 950 } 951 if (asoc->control_pdapi) { 952 /* 953 * With a normal shutdown we assume the end of last record. 954 */ 955 SCTP_INP_READ_LOCK(stcb->sctp_ep); 956 asoc->control_pdapi->end_added = 1; 957 asoc->control_pdapi->pdapi_aborted = 1; 958 asoc->control_pdapi = NULL; 959 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 960 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 961 atomic_add_int(&stcb->asoc.refcnt, 1); 962 SCTP_TCB_UNLOCK(stcb); 963 SCTP_SOCKET_LOCK(so, 1); 964 SCTP_TCB_LOCK(stcb); 965 atomic_subtract_int(&stcb->asoc.refcnt, 1); 966 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 967 /* assoc was freed while we were unlocked */ 968 SCTP_SOCKET_UNLOCK(so, 1); 969 return; 970 } 971 #endif 972 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 973 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 974 SCTP_SOCKET_UNLOCK(so, 1); 975 #endif 976 } 977 /* are the queues empty? */ 978 if (!TAILQ_EMPTY(&asoc->send_queue) || 979 !TAILQ_EMPTY(&asoc->sent_queue) || 980 !TAILQ_EMPTY(&asoc->out_wheel)) { 981 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 982 } 983 /* stop the timer */ 984 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 985 /* send SHUTDOWN-COMPLETE */ 986 sctp_send_shutdown_complete(stcb, net, 0); 987 /* notify upper layer protocol */ 988 if (stcb->sctp_socket) { 989 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 990 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 991 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 992 /* Set the connected flag to disconnected */ 993 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 994 } 995 } 996 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 997 /* free the TCB but first save off the ep */ 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 999 atomic_add_int(&stcb->asoc.refcnt, 1); 1000 SCTP_TCB_UNLOCK(stcb); 1001 SCTP_SOCKET_LOCK(so, 1); 1002 SCTP_TCB_LOCK(stcb); 1003 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1004 #endif 1005 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1006 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1007 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1008 SCTP_SOCKET_UNLOCK(so, 1); 1009 #endif 1010 } 1011 1012 /* 1013 * Skip past the param header and then we will find the chunk that caused the 1014 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1015 * our peer must be broken. 1016 */ 1017 static void 1018 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1019 struct sctp_nets *net) 1020 { 1021 struct sctp_chunkhdr *chk; 1022 1023 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1024 switch (chk->chunk_type) { 1025 case SCTP_ASCONF_ACK: 1026 case SCTP_ASCONF: 1027 sctp_asconf_cleanup(stcb, net); 1028 break; 1029 case SCTP_FORWARD_CUM_TSN: 1030 stcb->asoc.peer_supports_prsctp = 0; 1031 break; 1032 default: 1033 SCTPDBG(SCTP_DEBUG_INPUT2, 1034 "Peer does not support chunk type %d(%x)??\n", 1035 chk->chunk_type, (uint32_t) chk->chunk_type); 1036 break; 1037 } 1038 } 1039 1040 /* 1041 * Skip past the param header and then we will find the param that caused the 1042 * problem. There are a number of param's in a ASCONF OR the prsctp param 1043 * these will turn of specific features. 1044 */ 1045 static void 1046 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1047 { 1048 struct sctp_paramhdr *pbad; 1049 1050 pbad = phdr + 1; 1051 switch (ntohs(pbad->param_type)) { 1052 /* pr-sctp draft */ 1053 case SCTP_PRSCTP_SUPPORTED: 1054 stcb->asoc.peer_supports_prsctp = 0; 1055 break; 1056 case SCTP_SUPPORTED_CHUNK_EXT: 1057 break; 1058 /* draft-ietf-tsvwg-addip-sctp */ 1059 case SCTP_HAS_NAT_SUPPORT: 1060 stcb->asoc.peer_supports_nat = 0; 1061 break; 1062 case SCTP_ECN_NONCE_SUPPORTED: 1063 stcb->asoc.peer_supports_ecn_nonce = 0; 1064 stcb->asoc.ecn_nonce_allowed = 0; 1065 stcb->asoc.ecn_allowed = 0; 1066 break; 1067 case SCTP_ADD_IP_ADDRESS: 1068 case SCTP_DEL_IP_ADDRESS: 1069 case SCTP_SET_PRIM_ADDR: 1070 stcb->asoc.peer_supports_asconf = 0; 1071 break; 1072 case SCTP_SUCCESS_REPORT: 1073 case SCTP_ERROR_CAUSE_IND: 1074 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1075 SCTPDBG(SCTP_DEBUG_INPUT2, 1076 "Turning off ASCONF to this strange peer\n"); 1077 stcb->asoc.peer_supports_asconf = 0; 1078 break; 1079 default: 1080 SCTPDBG(SCTP_DEBUG_INPUT2, 1081 "Peer does not support param type %d(%x)??\n", 1082 pbad->param_type, (uint32_t) pbad->param_type); 1083 break; 1084 } 1085 } 1086 1087 static int 1088 sctp_handle_error(struct sctp_chunkhdr *ch, 1089 struct sctp_tcb *stcb, struct sctp_nets *net) 1090 { 1091 int chklen; 1092 struct sctp_paramhdr *phdr; 1093 uint16_t error_type; 1094 uint16_t error_len; 1095 struct sctp_association *asoc; 1096 int adjust; 1097 1098 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1099 struct socket *so; 1100 1101 #endif 1102 1103 /* parse through all of the errors and process */ 1104 asoc = &stcb->asoc; 1105 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1106 sizeof(struct sctp_chunkhdr)); 1107 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1108 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1109 /* Process an Error Cause */ 1110 error_type = ntohs(phdr->param_type); 1111 error_len = ntohs(phdr->param_length); 1112 if ((error_len > chklen) || (error_len == 0)) { 1113 /* invalid param length for this param */ 1114 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1115 chklen, error_len); 1116 return (0); 1117 } 1118 switch (error_type) { 1119 case SCTP_CAUSE_INVALID_STREAM: 1120 case SCTP_CAUSE_MISSING_PARAM: 1121 case SCTP_CAUSE_INVALID_PARAM: 1122 case SCTP_CAUSE_NO_USER_DATA: 1123 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1124 error_type); 1125 break; 1126 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1127 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1128 ch->chunk_flags); 1129 if (sctp_handle_nat_colliding_state(stcb)) { 1130 return (0); 1131 } 1132 break; 1133 case SCTP_CAUSE_NAT_MISSING_STATE: 1134 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1135 ch->chunk_flags); 1136 if (sctp_handle_nat_missing_state(stcb, net)) { 1137 return (0); 1138 } 1139 break; 1140 case SCTP_CAUSE_STALE_COOKIE: 1141 /* 1142 * We only act if we have echoed a cookie and are 1143 * waiting. 1144 */ 1145 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1146 int *p; 1147 1148 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1149 /* Save the time doubled */ 1150 asoc->cookie_preserve_req = ntohl(*p) << 1; 1151 asoc->stale_cookie_count++; 1152 if (asoc->stale_cookie_count > 1153 asoc->max_init_times) { 1154 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1155 /* now free the asoc */ 1156 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1157 so = SCTP_INP_SO(stcb->sctp_ep); 1158 atomic_add_int(&stcb->asoc.refcnt, 1); 1159 SCTP_TCB_UNLOCK(stcb); 1160 SCTP_SOCKET_LOCK(so, 1); 1161 SCTP_TCB_LOCK(stcb); 1162 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1163 #endif 1164 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1165 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1166 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1167 SCTP_SOCKET_UNLOCK(so, 1); 1168 #endif 1169 return (-1); 1170 } 1171 /* blast back to INIT state */ 1172 sctp_toss_old_cookies(stcb, &stcb->asoc); 1173 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1174 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1175 sctp_stop_all_cookie_timers(stcb); 1176 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1177 } 1178 break; 1179 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1180 /* 1181 * Nothing we can do here, we don't do hostname 1182 * addresses so if the peer does not like my IPv6 1183 * (or IPv4 for that matter) it does not matter. If 1184 * they don't support that type of address, they can 1185 * NOT possibly get that packet type... i.e. with no 1186 * IPv6 you can't recieve a IPv6 packet. so we can 1187 * safely ignore this one. If we ever added support 1188 * for HOSTNAME Addresses, then we would need to do 1189 * something here. 1190 */ 1191 break; 1192 case SCTP_CAUSE_UNRECOG_CHUNK: 1193 sctp_process_unrecog_chunk(stcb, phdr, net); 1194 break; 1195 case SCTP_CAUSE_UNRECOG_PARAM: 1196 sctp_process_unrecog_param(stcb, phdr); 1197 break; 1198 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1199 /* 1200 * We ignore this since the timer will drive out a 1201 * new cookie anyway and there timer will drive us 1202 * to send a SHUTDOWN_COMPLETE. We can't send one 1203 * here since we don't have their tag. 1204 */ 1205 break; 1206 case SCTP_CAUSE_DELETING_LAST_ADDR: 1207 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1208 case SCTP_CAUSE_DELETING_SRC_ADDR: 1209 /* 1210 * We should NOT get these here, but in a 1211 * ASCONF-ACK. 1212 */ 1213 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1214 error_type); 1215 break; 1216 case SCTP_CAUSE_OUT_OF_RESC: 1217 /* 1218 * And what, pray tell do we do with the fact that 1219 * the peer is out of resources? Not really sure we 1220 * could do anything but abort. I suspect this 1221 * should have came WITH an abort instead of in a 1222 * OP-ERROR. 1223 */ 1224 break; 1225 default: 1226 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1227 error_type); 1228 break; 1229 } 1230 adjust = SCTP_SIZE32(error_len); 1231 chklen -= adjust; 1232 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1233 } 1234 return (0); 1235 } 1236 1237 static int 1238 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1239 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1240 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1241 { 1242 struct sctp_init_ack *init_ack; 1243 struct mbuf *op_err; 1244 1245 SCTPDBG(SCTP_DEBUG_INPUT2, 1246 "sctp_handle_init_ack: handling INIT-ACK\n"); 1247 1248 if (stcb == NULL) { 1249 SCTPDBG(SCTP_DEBUG_INPUT2, 1250 "sctp_handle_init_ack: TCB is null\n"); 1251 return (-1); 1252 } 1253 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1254 /* Invalid length */ 1255 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1256 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1257 op_err, 0, net->port); 1258 *abort_no_unlock = 1; 1259 return (-1); 1260 } 1261 init_ack = &cp->init; 1262 /* validate parameters */ 1263 if (init_ack->initiate_tag == 0) { 1264 /* protocol error... send an abort */ 1265 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1266 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1267 op_err, 0, net->port); 1268 *abort_no_unlock = 1; 1269 return (-1); 1270 } 1271 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1272 /* protocol error... send an abort */ 1273 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1274 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1275 op_err, 0, net->port); 1276 *abort_no_unlock = 1; 1277 return (-1); 1278 } 1279 if (init_ack->num_inbound_streams == 0) { 1280 /* protocol error... send an abort */ 1281 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1282 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1283 op_err, 0, net->port); 1284 *abort_no_unlock = 1; 1285 return (-1); 1286 } 1287 if (init_ack->num_outbound_streams == 0) { 1288 /* protocol error... send an abort */ 1289 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1290 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1291 op_err, 0, net->port); 1292 *abort_no_unlock = 1; 1293 return (-1); 1294 } 1295 /* process according to association state... */ 1296 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1297 case SCTP_STATE_COOKIE_WAIT: 1298 /* this is the expected state for this chunk */ 1299 /* process the INIT-ACK parameters */ 1300 if (stcb->asoc.primary_destination->dest_state & 1301 SCTP_ADDR_UNCONFIRMED) { 1302 /* 1303 * The primary is where we sent the INIT, we can 1304 * always consider it confirmed when the INIT-ACK is 1305 * returned. Do this before we load addresses 1306 * though. 1307 */ 1308 stcb->asoc.primary_destination->dest_state &= 1309 ~SCTP_ADDR_UNCONFIRMED; 1310 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1311 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1312 } 1313 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1314 net, abort_no_unlock, vrf_id) < 0) { 1315 /* error in parsing parameters */ 1316 return (-1); 1317 } 1318 /* update our state */ 1319 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1320 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1321 1322 /* reset the RTO calc */ 1323 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1324 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1325 stcb->asoc.overall_error_count, 1326 0, 1327 SCTP_FROM_SCTP_INPUT, 1328 __LINE__); 1329 } 1330 stcb->asoc.overall_error_count = 0; 1331 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1332 /* 1333 * collapse the init timer back in case of a exponential 1334 * backoff 1335 */ 1336 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1337 stcb, net); 1338 /* 1339 * the send at the end of the inbound data processing will 1340 * cause the cookie to be sent 1341 */ 1342 break; 1343 case SCTP_STATE_SHUTDOWN_SENT: 1344 /* incorrect state... discard */ 1345 break; 1346 case SCTP_STATE_COOKIE_ECHOED: 1347 /* incorrect state... discard */ 1348 break; 1349 case SCTP_STATE_OPEN: 1350 /* incorrect state... discard */ 1351 break; 1352 case SCTP_STATE_EMPTY: 1353 case SCTP_STATE_INUSE: 1354 default: 1355 /* incorrect state... discard */ 1356 return (-1); 1357 break; 1358 } 1359 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1360 return (0); 1361 } 1362 1363 static struct sctp_tcb * 1364 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1365 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1366 struct sctp_inpcb *inp, struct sctp_nets **netp, 1367 struct sockaddr *init_src, int *notification, 1368 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1369 uint32_t vrf_id, uint16_t port); 1370 1371 1372 /* 1373 * handle a state cookie for an existing association m: input packet mbuf 1374 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1375 * "split" mbuf and the cookie signature does not exist offset: offset into 1376 * mbuf to the cookie-echo chunk 1377 */ 1378 static struct sctp_tcb * 1379 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1380 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1381 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1382 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1383 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1384 { 1385 struct sctp_association *asoc; 1386 struct sctp_init_chunk *init_cp, init_buf; 1387 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1388 struct sctp_nets *net; 1389 struct mbuf *op_err; 1390 struct sctp_paramhdr *ph; 1391 int chk_length; 1392 int init_offset, initack_offset, i; 1393 int retval; 1394 int spec_flag = 0; 1395 uint32_t how_indx; 1396 1397 net = *netp; 1398 /* I know that the TCB is non-NULL from the caller */ 1399 asoc = &stcb->asoc; 1400 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1401 if (asoc->cookie_how[how_indx] == 0) 1402 break; 1403 } 1404 if (how_indx < sizeof(asoc->cookie_how)) { 1405 asoc->cookie_how[how_indx] = 1; 1406 } 1407 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1408 /* SHUTDOWN came in after sending INIT-ACK */ 1409 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1410 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1411 0, M_DONTWAIT, 1, MT_DATA); 1412 if (op_err == NULL) { 1413 /* FOOBAR */ 1414 return (NULL); 1415 } 1416 /* Set the len */ 1417 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1418 ph = mtod(op_err, struct sctp_paramhdr *); 1419 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1420 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1421 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1422 vrf_id, net->port); 1423 if (how_indx < sizeof(asoc->cookie_how)) 1424 asoc->cookie_how[how_indx] = 2; 1425 return (NULL); 1426 } 1427 /* 1428 * find and validate the INIT chunk in the cookie (peer's info) the 1429 * INIT should start after the cookie-echo header struct (chunk 1430 * header, state cookie header struct) 1431 */ 1432 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1433 1434 init_cp = (struct sctp_init_chunk *) 1435 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1436 (uint8_t *) & init_buf); 1437 if (init_cp == NULL) { 1438 /* could not pull a INIT chunk in cookie */ 1439 return (NULL); 1440 } 1441 chk_length = ntohs(init_cp->ch.chunk_length); 1442 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1443 return (NULL); 1444 } 1445 /* 1446 * find and validate the INIT-ACK chunk in the cookie (my info) the 1447 * INIT-ACK follows the INIT chunk 1448 */ 1449 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1450 initack_cp = (struct sctp_init_ack_chunk *) 1451 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1452 (uint8_t *) & initack_buf); 1453 if (initack_cp == NULL) { 1454 /* could not pull INIT-ACK chunk in cookie */ 1455 return (NULL); 1456 } 1457 chk_length = ntohs(initack_cp->ch.chunk_length); 1458 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1459 return (NULL); 1460 } 1461 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1462 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1463 /* 1464 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1465 * to get into the OPEN state 1466 */ 1467 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1468 /*- 1469 * Opps, this means that we somehow generated two vtag's 1470 * the same. I.e. we did: 1471 * Us Peer 1472 * <---INIT(tag=a)------ 1473 * ----INIT-ACK(tag=t)--> 1474 * ----INIT(tag=t)------> *1 1475 * <---INIT-ACK(tag=a)--- 1476 * <----CE(tag=t)------------- *2 1477 * 1478 * At point *1 we should be generating a different 1479 * tag t'. Which means we would throw away the CE and send 1480 * ours instead. Basically this is case C (throw away side). 1481 */ 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 17; 1484 return (NULL); 1485 1486 } 1487 switch SCTP_GET_STATE 1488 (asoc) { 1489 case SCTP_STATE_COOKIE_WAIT: 1490 case SCTP_STATE_COOKIE_ECHOED: 1491 /* 1492 * INIT was sent but got a COOKIE_ECHO with the 1493 * correct tags... just accept it...but we must 1494 * process the init so that we can make sure we have 1495 * the right seq no's. 1496 */ 1497 /* First we must process the INIT !! */ 1498 retval = sctp_process_init(init_cp, stcb, net); 1499 if (retval < 0) { 1500 if (how_indx < sizeof(asoc->cookie_how)) 1501 asoc->cookie_how[how_indx] = 3; 1502 return (NULL); 1503 } 1504 /* we have already processed the INIT so no problem */ 1505 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1506 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1507 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1508 /* update current state */ 1509 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1510 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1511 else 1512 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1513 1514 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1515 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1516 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1517 stcb->sctp_ep, stcb, asoc->primary_destination); 1518 } 1519 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1520 sctp_stop_all_cookie_timers(stcb); 1521 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1522 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1523 (inp->sctp_socket->so_qlimit == 0) 1524 ) { 1525 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1526 struct socket *so; 1527 1528 #endif 1529 /* 1530 * Here is where collision would go if we 1531 * did a connect() and instead got a 1532 * init/init-ack/cookie done before the 1533 * init-ack came back.. 1534 */ 1535 stcb->sctp_ep->sctp_flags |= 1536 SCTP_PCB_FLAGS_CONNECTED; 1537 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1538 so = SCTP_INP_SO(stcb->sctp_ep); 1539 atomic_add_int(&stcb->asoc.refcnt, 1); 1540 SCTP_TCB_UNLOCK(stcb); 1541 SCTP_SOCKET_LOCK(so, 1); 1542 SCTP_TCB_LOCK(stcb); 1543 atomic_add_int(&stcb->asoc.refcnt, -1); 1544 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1545 SCTP_SOCKET_UNLOCK(so, 1); 1546 return (NULL); 1547 } 1548 #endif 1549 soisconnected(stcb->sctp_socket); 1550 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1551 SCTP_SOCKET_UNLOCK(so, 1); 1552 #endif 1553 } 1554 /* notify upper layer */ 1555 *notification = SCTP_NOTIFY_ASSOC_UP; 1556 /* 1557 * since we did not send a HB make sure we don't 1558 * double things 1559 */ 1560 net->hb_responded = 1; 1561 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1562 &cookie->time_entered, sctp_align_unsafe_makecopy); 1563 1564 if (stcb->asoc.sctp_autoclose_ticks && 1565 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1566 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1567 inp, stcb, NULL); 1568 } 1569 break; 1570 default: 1571 /* 1572 * we're in the OPEN state (or beyond), so peer must 1573 * have simply lost the COOKIE-ACK 1574 */ 1575 break; 1576 } /* end switch */ 1577 sctp_stop_all_cookie_timers(stcb); 1578 /* 1579 * We ignore the return code here.. not sure if we should 1580 * somehow abort.. but we do have an existing asoc. This 1581 * really should not fail. 1582 */ 1583 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1584 init_offset + sizeof(struct sctp_init_chunk), 1585 initack_offset, sh, init_src)) { 1586 if (how_indx < sizeof(asoc->cookie_how)) 1587 asoc->cookie_how[how_indx] = 4; 1588 return (NULL); 1589 } 1590 /* respond with a COOKIE-ACK */ 1591 sctp_toss_old_cookies(stcb, asoc); 1592 sctp_send_cookie_ack(stcb); 1593 if (how_indx < sizeof(asoc->cookie_how)) 1594 asoc->cookie_how[how_indx] = 5; 1595 return (stcb); 1596 } 1597 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1598 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1599 cookie->tie_tag_my_vtag == 0 && 1600 cookie->tie_tag_peer_vtag == 0) { 1601 /* 1602 * case C in Section 5.2.4 Table 2: XMOO silently discard 1603 */ 1604 if (how_indx < sizeof(asoc->cookie_how)) 1605 asoc->cookie_how[how_indx] = 6; 1606 return (NULL); 1607 } 1608 /* 1609 * If nat support, and the below and stcb is established, send back 1610 * a ABORT(colliding state) if we are established. 1611 */ 1612 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1613 (asoc->peer_supports_nat) && 1614 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1615 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1616 (asoc->peer_vtag == 0)))) { 1617 /* 1618 * Special case - Peer's support nat. We may have two init's 1619 * that we gave out the same tag on since one was not 1620 * established.. i.e. we get INIT from host-1 behind the nat 1621 * and we respond tag-a, we get a INIT from host-2 behind 1622 * the nat and we get tag-a again. Then we bring up host-1 1623 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1624 * Now we have colliding state. We must send an abort here 1625 * with colliding state indication. 1626 */ 1627 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1628 0, M_DONTWAIT, 1, MT_DATA); 1629 if (op_err == NULL) { 1630 /* FOOBAR */ 1631 return (NULL); 1632 } 1633 /* pre-reserve some space */ 1634 #ifdef INET6 1635 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1636 #else 1637 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1638 #endif 1639 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1640 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1641 /* Set the len */ 1642 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1643 ph = mtod(op_err, struct sctp_paramhdr *); 1644 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1645 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1646 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1647 return (NULL); 1648 } 1649 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1650 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1651 (asoc->peer_vtag == 0))) { 1652 /* 1653 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1654 * should be ok, re-accept peer info 1655 */ 1656 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1657 /* 1658 * Extension of case C. If we hit this, then the 1659 * random number generator returned the same vtag 1660 * when we first sent our INIT-ACK and when we later 1661 * sent our INIT. The side with the seq numbers that 1662 * are different will be the one that normnally 1663 * would have hit case C. This in effect "extends" 1664 * our vtags in this collision case to be 64 bits. 1665 * The same collision could occur aka you get both 1666 * vtag and seq number the same twice in a row.. but 1667 * is much less likely. If it did happen then we 1668 * would proceed through and bring up the assoc.. we 1669 * may end up with the wrong stream setup however.. 1670 * which would be bad.. but there is no way to 1671 * tell.. until we send on a stream that does not 1672 * exist :-) 1673 */ 1674 if (how_indx < sizeof(asoc->cookie_how)) 1675 asoc->cookie_how[how_indx] = 7; 1676 1677 return (NULL); 1678 } 1679 if (how_indx < sizeof(asoc->cookie_how)) 1680 asoc->cookie_how[how_indx] = 8; 1681 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1682 sctp_stop_all_cookie_timers(stcb); 1683 /* 1684 * since we did not send a HB make sure we don't double 1685 * things 1686 */ 1687 net->hb_responded = 1; 1688 if (stcb->asoc.sctp_autoclose_ticks && 1689 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1690 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1691 NULL); 1692 } 1693 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1694 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1695 1696 /* Note last_cwr_tsn? where is this used? */ 1697 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1698 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1699 /* 1700 * Ok the peer probably discarded our data (if we 1701 * echoed a cookie+data). So anything on the 1702 * sent_queue should be marked for retransmit, we 1703 * may not get something to kick us so it COULD 1704 * still take a timeout to move these.. but it can't 1705 * hurt to mark them. 1706 */ 1707 struct sctp_tmit_chunk *chk; 1708 1709 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1710 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1711 chk->sent = SCTP_DATAGRAM_RESEND; 1712 sctp_flight_size_decrease(chk); 1713 sctp_total_flight_decrease(stcb, chk); 1714 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1715 spec_flag++; 1716 } 1717 } 1718 1719 } 1720 /* process the INIT info (peer's info) */ 1721 retval = sctp_process_init(init_cp, stcb, net); 1722 if (retval < 0) { 1723 if (how_indx < sizeof(asoc->cookie_how)) 1724 asoc->cookie_how[how_indx] = 9; 1725 return (NULL); 1726 } 1727 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1728 init_offset + sizeof(struct sctp_init_chunk), 1729 initack_offset, sh, init_src)) { 1730 if (how_indx < sizeof(asoc->cookie_how)) 1731 asoc->cookie_how[how_indx] = 10; 1732 return (NULL); 1733 } 1734 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1735 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1736 *notification = SCTP_NOTIFY_ASSOC_UP; 1737 1738 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1739 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1740 (inp->sctp_socket->so_qlimit == 0)) { 1741 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1742 struct socket *so; 1743 1744 #endif 1745 stcb->sctp_ep->sctp_flags |= 1746 SCTP_PCB_FLAGS_CONNECTED; 1747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1748 so = SCTP_INP_SO(stcb->sctp_ep); 1749 atomic_add_int(&stcb->asoc.refcnt, 1); 1750 SCTP_TCB_UNLOCK(stcb); 1751 SCTP_SOCKET_LOCK(so, 1); 1752 SCTP_TCB_LOCK(stcb); 1753 atomic_add_int(&stcb->asoc.refcnt, -1); 1754 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1755 SCTP_SOCKET_UNLOCK(so, 1); 1756 return (NULL); 1757 } 1758 #endif 1759 soisconnected(stcb->sctp_socket); 1760 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1761 SCTP_SOCKET_UNLOCK(so, 1); 1762 #endif 1763 } 1764 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1765 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1766 else 1767 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1768 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1769 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1770 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1771 } else { 1772 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1773 } 1774 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1775 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1776 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1777 stcb->sctp_ep, stcb, asoc->primary_destination); 1778 } 1779 sctp_stop_all_cookie_timers(stcb); 1780 sctp_toss_old_cookies(stcb, asoc); 1781 sctp_send_cookie_ack(stcb); 1782 if (spec_flag) { 1783 /* 1784 * only if we have retrans set do we do this. What 1785 * this call does is get only the COOKIE-ACK out and 1786 * then when we return the normal call to 1787 * sctp_chunk_output will get the retrans out behind 1788 * this. 1789 */ 1790 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1791 } 1792 if (how_indx < sizeof(asoc->cookie_how)) 1793 asoc->cookie_how[how_indx] = 11; 1794 1795 return (stcb); 1796 } 1797 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1798 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1799 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1800 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1801 cookie->tie_tag_peer_vtag != 0) { 1802 struct sctpasochead *head; 1803 1804 if (asoc->peer_supports_nat) { 1805 /* 1806 * This is a gross gross hack. just call the 1807 * cookie_new code since we are allowing a duplicate 1808 * association. I hope this works... 1809 */ 1810 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1811 inp, netp, init_src, notification, 1812 auth_skipped, auth_offset, auth_len, 1813 vrf_id, port)); 1814 } 1815 /* 1816 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1817 */ 1818 /* temp code */ 1819 if (how_indx < sizeof(asoc->cookie_how)) 1820 asoc->cookie_how[how_indx] = 12; 1821 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1822 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1823 1824 *sac_assoc_id = sctp_get_associd(stcb); 1825 /* notify upper layer */ 1826 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1827 atomic_add_int(&stcb->asoc.refcnt, 1); 1828 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1829 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1830 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1831 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1832 } 1833 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1834 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1835 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1836 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1837 } 1838 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1839 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1840 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1841 stcb->sctp_ep, stcb, asoc->primary_destination); 1842 1843 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1844 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1845 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1846 } 1847 asoc->pre_open_streams = 1848 ntohs(initack_cp->init.num_outbound_streams); 1849 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1850 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1851 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1852 1853 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1854 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1855 1856 asoc->str_reset_seq_in = asoc->init_seq_number; 1857 1858 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1859 if (asoc->mapping_array) { 1860 memset(asoc->mapping_array, 0, 1861 asoc->mapping_array_size); 1862 } 1863 /* EY 05/13/08 - nr_sack version of the above if statement */ 1864 if (asoc->nr_mapping_array && SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) 1865 && asoc->peer_supports_nr_sack) { 1866 memset(asoc->nr_mapping_array, 0, 1867 asoc->nr_mapping_array_size); 1868 } 1869 SCTP_TCB_UNLOCK(stcb); 1870 SCTP_INP_INFO_WLOCK(); 1871 SCTP_INP_WLOCK(stcb->sctp_ep); 1872 SCTP_TCB_LOCK(stcb); 1873 atomic_add_int(&stcb->asoc.refcnt, -1); 1874 /* send up all the data */ 1875 SCTP_TCB_SEND_LOCK(stcb); 1876 1877 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1878 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1879 stcb->asoc.strmout[i].stream_no = i; 1880 stcb->asoc.strmout[i].next_sequence_sent = 0; 1881 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1882 } 1883 /* process the INIT-ACK info (my info) */ 1884 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1885 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1886 1887 /* pull from vtag hash */ 1888 LIST_REMOVE(stcb, sctp_asocs); 1889 /* re-insert to new vtag position */ 1890 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1891 SCTP_BASE_INFO(hashasocmark))]; 1892 /* 1893 * put it in the bucket in the vtag hash of assoc's for the 1894 * system 1895 */ 1896 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1897 1898 /* process the INIT info (peer's info) */ 1899 SCTP_TCB_SEND_UNLOCK(stcb); 1900 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1901 SCTP_INP_INFO_WUNLOCK(); 1902 1903 retval = sctp_process_init(init_cp, stcb, net); 1904 if (retval < 0) { 1905 if (how_indx < sizeof(asoc->cookie_how)) 1906 asoc->cookie_how[how_indx] = 13; 1907 1908 return (NULL); 1909 } 1910 /* 1911 * since we did not send a HB make sure we don't double 1912 * things 1913 */ 1914 net->hb_responded = 1; 1915 1916 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1917 init_offset + sizeof(struct sctp_init_chunk), 1918 initack_offset, sh, init_src)) { 1919 if (how_indx < sizeof(asoc->cookie_how)) 1920 asoc->cookie_how[how_indx] = 14; 1921 1922 return (NULL); 1923 } 1924 /* respond with a COOKIE-ACK */ 1925 sctp_stop_all_cookie_timers(stcb); 1926 sctp_toss_old_cookies(stcb, asoc); 1927 sctp_send_cookie_ack(stcb); 1928 if (how_indx < sizeof(asoc->cookie_how)) 1929 asoc->cookie_how[how_indx] = 15; 1930 1931 return (stcb); 1932 } 1933 if (how_indx < sizeof(asoc->cookie_how)) 1934 asoc->cookie_how[how_indx] = 16; 1935 /* all other cases... */ 1936 return (NULL); 1937 } 1938 1939 1940 /* 1941 * handle a state cookie for a new association m: input packet mbuf chain-- 1942 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1943 * and the cookie signature does not exist offset: offset into mbuf to the 1944 * cookie-echo chunk length: length of the cookie chunk to: where the init 1945 * was from returns a new TCB 1946 */ 1947 struct sctp_tcb * 1948 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1949 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1950 struct sctp_inpcb *inp, struct sctp_nets **netp, 1951 struct sockaddr *init_src, int *notification, 1952 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1953 uint32_t vrf_id, uint16_t port) 1954 { 1955 struct sctp_tcb *stcb; 1956 struct sctp_init_chunk *init_cp, init_buf; 1957 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1958 struct sockaddr_storage sa_store; 1959 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1960 struct sockaddr_in *sin; 1961 struct sockaddr_in6 *sin6; 1962 struct sctp_association *asoc; 1963 int chk_length; 1964 int init_offset, initack_offset, initack_limit; 1965 int retval; 1966 int error = 0; 1967 uint32_t old_tag; 1968 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1969 1970 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1971 struct socket *so; 1972 1973 so = SCTP_INP_SO(inp); 1974 #endif 1975 1976 /* 1977 * find and validate the INIT chunk in the cookie (peer's info) the 1978 * INIT should start after the cookie-echo header struct (chunk 1979 * header, state cookie header struct) 1980 */ 1981 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1982 init_cp = (struct sctp_init_chunk *) 1983 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1984 (uint8_t *) & init_buf); 1985 if (init_cp == NULL) { 1986 /* could not pull a INIT chunk in cookie */ 1987 SCTPDBG(SCTP_DEBUG_INPUT1, 1988 "process_cookie_new: could not pull INIT chunk hdr\n"); 1989 return (NULL); 1990 } 1991 chk_length = ntohs(init_cp->ch.chunk_length); 1992 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1993 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1994 return (NULL); 1995 } 1996 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1997 /* 1998 * find and validate the INIT-ACK chunk in the cookie (my info) the 1999 * INIT-ACK follows the INIT chunk 2000 */ 2001 initack_cp = (struct sctp_init_ack_chunk *) 2002 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2003 (uint8_t *) & initack_buf); 2004 if (initack_cp == NULL) { 2005 /* could not pull INIT-ACK chunk in cookie */ 2006 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2007 return (NULL); 2008 } 2009 chk_length = ntohs(initack_cp->ch.chunk_length); 2010 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2011 return (NULL); 2012 } 2013 /* 2014 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2015 * "initack_limit" value. This is because the chk_length field 2016 * includes the length of the cookie, but the cookie is omitted when 2017 * the INIT and INIT_ACK are tacked onto the cookie... 2018 */ 2019 initack_limit = offset + cookie_len; 2020 2021 /* 2022 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2023 * and popluate 2024 */ 2025 2026 /* 2027 * Here we do a trick, we set in NULL for the proc/thread argument. 2028 * We do this since in effect we only use the p argument when the 2029 * socket is unbound and we must do an implicit bind. Since we are 2030 * getting a cookie, we cannot be unbound. 2031 */ 2032 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 2033 ntohl(initack_cp->init.initiate_tag), vrf_id, 2034 (struct thread *)NULL 2035 ); 2036 if (stcb == NULL) { 2037 struct mbuf *op_err; 2038 2039 /* memory problem? */ 2040 SCTPDBG(SCTP_DEBUG_INPUT1, 2041 "process_cookie_new: no room for another TCB!\n"); 2042 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2043 2044 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2045 sh, op_err, vrf_id, port); 2046 return (NULL); 2047 } 2048 /* get the correct sctp_nets */ 2049 if (netp) 2050 *netp = sctp_findnet(stcb, init_src); 2051 2052 asoc = &stcb->asoc; 2053 /* get scope variables out of cookie */ 2054 asoc->ipv4_local_scope = cookie->ipv4_scope; 2055 asoc->site_scope = cookie->site_scope; 2056 asoc->local_scope = cookie->local_scope; 2057 asoc->loopback_scope = cookie->loopback_scope; 2058 2059 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2060 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2061 struct mbuf *op_err; 2062 2063 /* 2064 * Houston we have a problem. The EP changed while the 2065 * cookie was in flight. Only recourse is to abort the 2066 * association. 2067 */ 2068 atomic_add_int(&stcb->asoc.refcnt, 1); 2069 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2070 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2071 sh, op_err, vrf_id, port); 2072 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2073 SCTP_TCB_UNLOCK(stcb); 2074 SCTP_SOCKET_LOCK(so, 1); 2075 SCTP_TCB_LOCK(stcb); 2076 #endif 2077 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2078 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2079 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2080 SCTP_SOCKET_UNLOCK(so, 1); 2081 #endif 2082 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2083 return (NULL); 2084 } 2085 /* process the INIT-ACK info (my info) */ 2086 old_tag = asoc->my_vtag; 2087 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2088 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2089 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2090 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2091 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2092 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2093 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2094 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2095 asoc->str_reset_seq_in = asoc->init_seq_number; 2096 2097 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2098 2099 /* process the INIT info (peer's info) */ 2100 if (netp) 2101 retval = sctp_process_init(init_cp, stcb, *netp); 2102 else 2103 retval = 0; 2104 if (retval < 0) { 2105 atomic_add_int(&stcb->asoc.refcnt, 1); 2106 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2107 SCTP_TCB_UNLOCK(stcb); 2108 SCTP_SOCKET_LOCK(so, 1); 2109 SCTP_TCB_LOCK(stcb); 2110 #endif 2111 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2112 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2113 SCTP_SOCKET_UNLOCK(so, 1); 2114 #endif 2115 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2116 return (NULL); 2117 } 2118 /* load all addresses */ 2119 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2120 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2121 init_src)) { 2122 atomic_add_int(&stcb->asoc.refcnt, 1); 2123 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2124 SCTP_TCB_UNLOCK(stcb); 2125 SCTP_SOCKET_LOCK(so, 1); 2126 SCTP_TCB_LOCK(stcb); 2127 #endif 2128 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2129 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2130 SCTP_SOCKET_UNLOCK(so, 1); 2131 #endif 2132 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2133 return (NULL); 2134 } 2135 /* 2136 * verify any preceding AUTH chunk that was skipped 2137 */ 2138 /* pull the local authentication parameters from the cookie/init-ack */ 2139 sctp_auth_get_cookie_params(stcb, m, 2140 initack_offset + sizeof(struct sctp_init_ack_chunk), 2141 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2142 if (auth_skipped) { 2143 struct sctp_auth_chunk *auth; 2144 2145 auth = (struct sctp_auth_chunk *) 2146 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2147 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2148 /* auth HMAC failed, dump the assoc and packet */ 2149 SCTPDBG(SCTP_DEBUG_AUTH1, 2150 "COOKIE-ECHO: AUTH failed\n"); 2151 atomic_add_int(&stcb->asoc.refcnt, 1); 2152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_TCB_UNLOCK(stcb); 2154 SCTP_SOCKET_LOCK(so, 1); 2155 SCTP_TCB_LOCK(stcb); 2156 #endif 2157 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2158 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2159 SCTP_SOCKET_UNLOCK(so, 1); 2160 #endif 2161 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2162 return (NULL); 2163 } else { 2164 /* remaining chunks checked... good to go */ 2165 stcb->asoc.authenticated = 1; 2166 } 2167 } 2168 /* update current state */ 2169 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2170 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2171 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2172 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2173 stcb->sctp_ep, stcb, asoc->primary_destination); 2174 } 2175 sctp_stop_all_cookie_timers(stcb); 2176 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2177 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2178 2179 /* 2180 * if we're doing ASCONFs, check to see if we have any new local 2181 * addresses that need to get added to the peer (eg. addresses 2182 * changed while cookie echo in flight). This needs to be done 2183 * after we go to the OPEN state to do the correct asconf 2184 * processing. else, make sure we have the correct addresses in our 2185 * lists 2186 */ 2187 2188 /* warning, we re-use sin, sin6, sa_store here! */ 2189 /* pull in local_address (our "from" address) */ 2190 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2191 /* source addr is IPv4 */ 2192 sin = (struct sockaddr_in *)initack_src; 2193 memset(sin, 0, sizeof(*sin)); 2194 sin->sin_family = AF_INET; 2195 sin->sin_len = sizeof(struct sockaddr_in); 2196 sin->sin_addr.s_addr = cookie->laddress[0]; 2197 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2198 /* source addr is IPv6 */ 2199 sin6 = (struct sockaddr_in6 *)initack_src; 2200 memset(sin6, 0, sizeof(*sin6)); 2201 sin6->sin6_family = AF_INET6; 2202 sin6->sin6_len = sizeof(struct sockaddr_in6); 2203 sin6->sin6_scope_id = cookie->scope_id; 2204 memcpy(&sin6->sin6_addr, cookie->laddress, 2205 sizeof(sin6->sin6_addr)); 2206 } else { 2207 atomic_add_int(&stcb->asoc.refcnt, 1); 2208 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2209 SCTP_TCB_UNLOCK(stcb); 2210 SCTP_SOCKET_LOCK(so, 1); 2211 SCTP_TCB_LOCK(stcb); 2212 #endif 2213 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2214 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2215 SCTP_SOCKET_UNLOCK(so, 1); 2216 #endif 2217 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2218 return (NULL); 2219 } 2220 2221 /* set up to notify upper layer */ 2222 *notification = SCTP_NOTIFY_ASSOC_UP; 2223 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2224 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2225 (inp->sctp_socket->so_qlimit == 0)) { 2226 /* 2227 * This is an endpoint that called connect() how it got a 2228 * cookie that is NEW is a bit of a mystery. It must be that 2229 * the INIT was sent, but before it got there.. a complete 2230 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2231 * should have went to the other code.. not here.. oh well.. 2232 * a bit of protection is worth having.. 2233 */ 2234 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2235 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 atomic_add_int(&stcb->asoc.refcnt, 1); 2237 SCTP_TCB_UNLOCK(stcb); 2238 SCTP_SOCKET_LOCK(so, 1); 2239 SCTP_TCB_LOCK(stcb); 2240 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2241 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2242 SCTP_SOCKET_UNLOCK(so, 1); 2243 return (NULL); 2244 } 2245 #endif 2246 soisconnected(stcb->sctp_socket); 2247 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2248 SCTP_SOCKET_UNLOCK(so, 1); 2249 #endif 2250 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2251 (inp->sctp_socket->so_qlimit)) { 2252 /* 2253 * We don't want to do anything with this one. Since it is 2254 * the listening guy. The timer will get started for 2255 * accepted connections in the caller. 2256 */ 2257 ; 2258 } 2259 /* since we did not send a HB make sure we don't double things */ 2260 if ((netp) && (*netp)) 2261 (*netp)->hb_responded = 1; 2262 2263 if (stcb->asoc.sctp_autoclose_ticks && 2264 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2265 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2266 } 2267 /* calculate the RTT */ 2268 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2269 if ((netp) && (*netp)) { 2270 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2271 &cookie->time_entered, sctp_align_unsafe_makecopy); 2272 } 2273 /* respond with a COOKIE-ACK */ 2274 sctp_send_cookie_ack(stcb); 2275 2276 /* 2277 * check the address lists for any ASCONFs that need to be sent 2278 * AFTER the cookie-ack is sent 2279 */ 2280 sctp_check_address_list(stcb, m, 2281 initack_offset + sizeof(struct sctp_init_ack_chunk), 2282 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2283 initack_src, cookie->local_scope, cookie->site_scope, 2284 cookie->ipv4_scope, cookie->loopback_scope); 2285 2286 2287 return (stcb); 2288 } 2289 2290 /* 2291 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2292 * we NEED to make sure we are not already using the vtag. If so we 2293 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2294 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2295 SCTP_BASE_INFO(hashasocmark))]; 2296 LIST_FOREACH(stcb, head, sctp_asocs) { 2297 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2298 -- SEND ABORT - TRY AGAIN -- 2299 } 2300 } 2301 */ 2302 2303 /* 2304 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2305 * existing (non-NULL) TCB 2306 */ 2307 static struct mbuf * 2308 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2309 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2310 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2311 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2312 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2313 { 2314 struct sctp_state_cookie *cookie; 2315 struct sockaddr_in6 sin6; 2316 struct sockaddr_in sin; 2317 struct sctp_tcb *l_stcb = *stcb; 2318 struct sctp_inpcb *l_inp; 2319 struct sockaddr *to; 2320 sctp_assoc_t sac_restart_id; 2321 struct sctp_pcb *ep; 2322 struct mbuf *m_sig; 2323 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2324 uint8_t *sig; 2325 uint8_t cookie_ok = 0; 2326 unsigned int size_of_pkt, sig_offset, cookie_offset; 2327 unsigned int cookie_len; 2328 struct timeval now; 2329 struct timeval time_expires; 2330 struct sockaddr_storage dest_store; 2331 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2332 struct ip *iph; 2333 int notification = 0; 2334 struct sctp_nets *netl; 2335 int had_a_existing_tcb = 0; 2336 2337 SCTPDBG(SCTP_DEBUG_INPUT2, 2338 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2339 2340 if (inp_p == NULL) { 2341 return (NULL); 2342 } 2343 /* First get the destination address setup too. */ 2344 iph = mtod(m, struct ip *); 2345 switch (iph->ip_v) { 2346 case IPVERSION: 2347 { 2348 /* its IPv4 */ 2349 struct sockaddr_in *lsin; 2350 2351 lsin = (struct sockaddr_in *)(localep_sa); 2352 memset(lsin, 0, sizeof(*lsin)); 2353 lsin->sin_family = AF_INET; 2354 lsin->sin_len = sizeof(*lsin); 2355 lsin->sin_port = sh->dest_port; 2356 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2357 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2358 break; 2359 } 2360 #ifdef INET6 2361 case IPV6_VERSION >> 4: 2362 { 2363 /* its IPv6 */ 2364 struct ip6_hdr *ip6; 2365 struct sockaddr_in6 *lsin6; 2366 2367 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2368 memset(lsin6, 0, sizeof(*lsin6)); 2369 lsin6->sin6_family = AF_INET6; 2370 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2371 ip6 = mtod(m, struct ip6_hdr *); 2372 lsin6->sin6_port = sh->dest_port; 2373 lsin6->sin6_addr = ip6->ip6_dst; 2374 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2375 break; 2376 } 2377 #endif 2378 default: 2379 return (NULL); 2380 } 2381 2382 cookie = &cp->cookie; 2383 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2384 cookie_len = ntohs(cp->ch.chunk_length); 2385 2386 if ((cookie->peerport != sh->src_port) && 2387 (cookie->myport != sh->dest_port) && 2388 (cookie->my_vtag != sh->v_tag)) { 2389 /* 2390 * invalid ports or bad tag. Note that we always leave the 2391 * v_tag in the header in network order and when we stored 2392 * it in the my_vtag slot we also left it in network order. 2393 * This maintains the match even though it may be in the 2394 * opposite byte order of the machine :-> 2395 */ 2396 return (NULL); 2397 } 2398 if (cookie_len > size_of_pkt || 2399 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2400 sizeof(struct sctp_init_chunk) + 2401 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2402 /* cookie too long! or too small */ 2403 return (NULL); 2404 } 2405 /* 2406 * split off the signature into its own mbuf (since it should not be 2407 * calculated in the sctp_hmac_m() call). 2408 */ 2409 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2410 if (sig_offset > size_of_pkt) { 2411 /* packet not correct size! */ 2412 /* XXX this may already be accounted for earlier... */ 2413 return (NULL); 2414 } 2415 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2416 if (m_sig == NULL) { 2417 /* out of memory or ?? */ 2418 return (NULL); 2419 } 2420 #ifdef SCTP_MBUF_LOGGING 2421 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2422 struct mbuf *mat; 2423 2424 mat = m_sig; 2425 while (mat) { 2426 if (SCTP_BUF_IS_EXTENDED(mat)) { 2427 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2428 } 2429 mat = SCTP_BUF_NEXT(mat); 2430 } 2431 } 2432 #endif 2433 2434 /* 2435 * compute the signature/digest for the cookie 2436 */ 2437 ep = &(*inp_p)->sctp_ep; 2438 l_inp = *inp_p; 2439 if (l_stcb) { 2440 SCTP_TCB_UNLOCK(l_stcb); 2441 } 2442 SCTP_INP_RLOCK(l_inp); 2443 if (l_stcb) { 2444 SCTP_TCB_LOCK(l_stcb); 2445 } 2446 /* which cookie is it? */ 2447 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2448 (ep->current_secret_number != ep->last_secret_number)) { 2449 /* it's the old cookie */ 2450 (void)sctp_hmac_m(SCTP_HMAC, 2451 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2452 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2453 } else { 2454 /* it's the current cookie */ 2455 (void)sctp_hmac_m(SCTP_HMAC, 2456 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2457 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2458 } 2459 /* get the signature */ 2460 SCTP_INP_RUNLOCK(l_inp); 2461 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2462 if (sig == NULL) { 2463 /* couldn't find signature */ 2464 sctp_m_freem(m_sig); 2465 return (NULL); 2466 } 2467 /* compare the received digest with the computed digest */ 2468 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2469 /* try the old cookie? */ 2470 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2471 (ep->current_secret_number != ep->last_secret_number)) { 2472 /* compute digest with old */ 2473 (void)sctp_hmac_m(SCTP_HMAC, 2474 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2475 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2476 /* compare */ 2477 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2478 cookie_ok = 1; 2479 } 2480 } else { 2481 cookie_ok = 1; 2482 } 2483 2484 /* 2485 * Now before we continue we must reconstruct our mbuf so that 2486 * normal processing of any other chunks will work. 2487 */ 2488 { 2489 struct mbuf *m_at; 2490 2491 m_at = m; 2492 while (SCTP_BUF_NEXT(m_at) != NULL) { 2493 m_at = SCTP_BUF_NEXT(m_at); 2494 } 2495 SCTP_BUF_NEXT(m_at) = m_sig; 2496 } 2497 2498 if (cookie_ok == 0) { 2499 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2500 SCTPDBG(SCTP_DEBUG_INPUT2, 2501 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2502 (uint32_t) offset, cookie_offset, sig_offset); 2503 return (NULL); 2504 } 2505 /* 2506 * check the cookie timestamps to be sure it's not stale 2507 */ 2508 (void)SCTP_GETTIME_TIMEVAL(&now); 2509 /* Expire time is in Ticks, so we convert to seconds */ 2510 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2511 time_expires.tv_usec = cookie->time_entered.tv_usec; 2512 /* 2513 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2514 * is undefined. 2515 */ 2516 if (timevalcmp(&now, &time_expires, >)) { 2517 /* cookie is stale! */ 2518 struct mbuf *op_err; 2519 struct sctp_stale_cookie_msg *scm; 2520 uint32_t tim; 2521 2522 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2523 0, M_DONTWAIT, 1, MT_DATA); 2524 if (op_err == NULL) { 2525 /* FOOBAR */ 2526 return (NULL); 2527 } 2528 /* Set the len */ 2529 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2530 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2531 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2532 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2533 (sizeof(uint32_t)))); 2534 /* seconds to usec */ 2535 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2536 /* add in usec */ 2537 if (tim == 0) 2538 tim = now.tv_usec - cookie->time_entered.tv_usec; 2539 scm->time_usec = htonl(tim); 2540 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2541 vrf_id, port); 2542 return (NULL); 2543 } 2544 /* 2545 * Now we must see with the lookup address if we have an existing 2546 * asoc. This will only happen if we were in the COOKIE-WAIT state 2547 * and a INIT collided with us and somewhere the peer sent the 2548 * cookie on another address besides the single address our assoc 2549 * had for him. In this case we will have one of the tie-tags set at 2550 * least AND the address field in the cookie can be used to look it 2551 * up. 2552 */ 2553 to = NULL; 2554 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2555 memset(&sin6, 0, sizeof(sin6)); 2556 sin6.sin6_family = AF_INET6; 2557 sin6.sin6_len = sizeof(sin6); 2558 sin6.sin6_port = sh->src_port; 2559 sin6.sin6_scope_id = cookie->scope_id; 2560 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2561 sizeof(sin6.sin6_addr.s6_addr)); 2562 to = (struct sockaddr *)&sin6; 2563 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2564 memset(&sin, 0, sizeof(sin)); 2565 sin.sin_family = AF_INET; 2566 sin.sin_len = sizeof(sin); 2567 sin.sin_port = sh->src_port; 2568 sin.sin_addr.s_addr = cookie->address[0]; 2569 to = (struct sockaddr *)&sin; 2570 } else { 2571 /* This should not happen */ 2572 return (NULL); 2573 } 2574 if ((*stcb == NULL) && to) { 2575 /* Yep, lets check */ 2576 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2577 if (*stcb == NULL) { 2578 /* 2579 * We should have only got back the same inp. If we 2580 * got back a different ep we have a problem. The 2581 * original findep got back l_inp and now 2582 */ 2583 if (l_inp != *inp_p) { 2584 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2585 } 2586 } else { 2587 if (*locked_tcb == NULL) { 2588 /* 2589 * In this case we found the assoc only 2590 * after we locked the create lock. This 2591 * means we are in a colliding case and we 2592 * must make sure that we unlock the tcb if 2593 * its one of the cases where we throw away 2594 * the incoming packets. 2595 */ 2596 *locked_tcb = *stcb; 2597 2598 /* 2599 * We must also increment the inp ref count 2600 * since the ref_count flags was set when we 2601 * did not find the TCB, now we found it 2602 * which reduces the refcount.. we must 2603 * raise it back out to balance it all :-) 2604 */ 2605 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2606 if ((*stcb)->sctp_ep != l_inp) { 2607 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2608 (*stcb)->sctp_ep, l_inp); 2609 } 2610 } 2611 } 2612 } 2613 if (to == NULL) { 2614 return (NULL); 2615 } 2616 cookie_len -= SCTP_SIGNATURE_SIZE; 2617 if (*stcb == NULL) { 2618 /* this is the "normal" case... get a new TCB */ 2619 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2620 cookie_len, *inp_p, netp, to, ¬ification, 2621 auth_skipped, auth_offset, auth_len, vrf_id, port); 2622 } else { 2623 /* this is abnormal... cookie-echo on existing TCB */ 2624 had_a_existing_tcb = 1; 2625 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2626 cookie, cookie_len, *inp_p, *stcb, netp, to, 2627 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2628 } 2629 2630 if (*stcb == NULL) { 2631 /* still no TCB... must be bad cookie-echo */ 2632 return (NULL); 2633 } 2634 /* 2635 * Ok, we built an association so confirm the address we sent the 2636 * INIT-ACK to. 2637 */ 2638 netl = sctp_findnet(*stcb, to); 2639 /* 2640 * This code should in theory NOT run but 2641 */ 2642 if (netl == NULL) { 2643 /* TSNH! Huh, why do I need to add this address here? */ 2644 int ret; 2645 2646 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2647 SCTP_IN_COOKIE_PROC); 2648 netl = sctp_findnet(*stcb, to); 2649 } 2650 if (netl) { 2651 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2652 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2653 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2654 netl); 2655 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2656 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2657 } 2658 } 2659 if (*stcb) { 2660 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2661 *stcb, NULL); 2662 } 2663 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2664 if (!had_a_existing_tcb || 2665 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2666 /* 2667 * If we have a NEW cookie or the connect never 2668 * reached the connected state during collision we 2669 * must do the TCP accept thing. 2670 */ 2671 struct socket *so, *oso; 2672 struct sctp_inpcb *inp; 2673 2674 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2675 /* 2676 * For a restart we will keep the same 2677 * socket, no need to do anything. I THINK!! 2678 */ 2679 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2680 return (m); 2681 } 2682 oso = (*inp_p)->sctp_socket; 2683 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2684 SCTP_TCB_UNLOCK((*stcb)); 2685 so = sonewconn(oso, 0 2686 ); 2687 SCTP_TCB_LOCK((*stcb)); 2688 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2689 2690 if (so == NULL) { 2691 struct mbuf *op_err; 2692 2693 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2694 struct socket *pcb_so; 2695 2696 #endif 2697 /* Too many sockets */ 2698 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2699 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2700 sctp_abort_association(*inp_p, NULL, m, iphlen, 2701 sh, op_err, vrf_id, port); 2702 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2703 pcb_so = SCTP_INP_SO(*inp_p); 2704 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2705 SCTP_TCB_UNLOCK((*stcb)); 2706 SCTP_SOCKET_LOCK(pcb_so, 1); 2707 SCTP_TCB_LOCK((*stcb)); 2708 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2709 #endif 2710 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2711 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2712 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2713 #endif 2714 return (NULL); 2715 } 2716 inp = (struct sctp_inpcb *)so->so_pcb; 2717 SCTP_INP_INCR_REF(inp); 2718 /* 2719 * We add the unbound flag here so that if we get an 2720 * soabort() before we get the move_pcb done, we 2721 * will properly cleanup. 2722 */ 2723 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2724 SCTP_PCB_FLAGS_CONNECTED | 2725 SCTP_PCB_FLAGS_IN_TCPPOOL | 2726 SCTP_PCB_FLAGS_UNBOUND | 2727 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2728 SCTP_PCB_FLAGS_DONT_WAKE); 2729 inp->sctp_features = (*inp_p)->sctp_features; 2730 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2731 inp->sctp_socket = so; 2732 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2733 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2734 inp->sctp_context = (*inp_p)->sctp_context; 2735 inp->inp_starting_point_for_iterator = NULL; 2736 /* 2737 * copy in the authentication parameters from the 2738 * original endpoint 2739 */ 2740 if (inp->sctp_ep.local_hmacs) 2741 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2742 inp->sctp_ep.local_hmacs = 2743 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2744 if (inp->sctp_ep.local_auth_chunks) 2745 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2746 inp->sctp_ep.local_auth_chunks = 2747 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2748 2749 /* 2750 * Now we must move it from one hash table to 2751 * another and get the tcb in the right place. 2752 */ 2753 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2754 2755 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2756 SCTP_TCB_UNLOCK((*stcb)); 2757 2758 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2759 0); 2760 SCTP_TCB_LOCK((*stcb)); 2761 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2762 2763 2764 /* 2765 * now we must check to see if we were aborted while 2766 * the move was going on and the lock/unlock 2767 * happened. 2768 */ 2769 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2770 /* 2771 * yep it was, we leave the assoc attached 2772 * to the socket since the sctp_inpcb_free() 2773 * call will send an abort for us. 2774 */ 2775 SCTP_INP_DECR_REF(inp); 2776 return (NULL); 2777 } 2778 SCTP_INP_DECR_REF(inp); 2779 /* Switch over to the new guy */ 2780 *inp_p = inp; 2781 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2782 2783 /* 2784 * Pull it from the incomplete queue and wake the 2785 * guy 2786 */ 2787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2788 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2789 SCTP_TCB_UNLOCK((*stcb)); 2790 SCTP_SOCKET_LOCK(so, 1); 2791 #endif 2792 soisconnected(so); 2793 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2794 SCTP_TCB_LOCK((*stcb)); 2795 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2796 SCTP_SOCKET_UNLOCK(so, 1); 2797 #endif 2798 return (m); 2799 } 2800 } 2801 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2802 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2803 } 2804 return (m); 2805 } 2806 2807 static void 2808 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2809 struct sctp_tcb *stcb, struct sctp_nets *net) 2810 { 2811 /* cp must not be used, others call this without a c-ack :-) */ 2812 struct sctp_association *asoc; 2813 2814 SCTPDBG(SCTP_DEBUG_INPUT2, 2815 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2816 if (stcb == NULL) 2817 return; 2818 2819 asoc = &stcb->asoc; 2820 2821 sctp_stop_all_cookie_timers(stcb); 2822 /* process according to association state */ 2823 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2824 /* state change only needed when I am in right state */ 2825 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2826 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2827 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2828 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2829 stcb->sctp_ep, stcb, asoc->primary_destination); 2830 2831 } 2832 /* update RTO */ 2833 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2834 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2835 if (asoc->overall_error_count == 0) { 2836 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2837 &asoc->time_entered, sctp_align_safe_nocopy); 2838 } 2839 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2840 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2841 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2842 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2843 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2844 struct socket *so; 2845 2846 #endif 2847 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2848 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2849 so = SCTP_INP_SO(stcb->sctp_ep); 2850 atomic_add_int(&stcb->asoc.refcnt, 1); 2851 SCTP_TCB_UNLOCK(stcb); 2852 SCTP_SOCKET_LOCK(so, 1); 2853 SCTP_TCB_LOCK(stcb); 2854 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2855 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2856 SCTP_SOCKET_UNLOCK(so, 1); 2857 return; 2858 } 2859 #endif 2860 soisconnected(stcb->sctp_socket); 2861 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2862 SCTP_SOCKET_UNLOCK(so, 1); 2863 #endif 2864 } 2865 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2866 stcb, net); 2867 /* 2868 * since we did not send a HB make sure we don't double 2869 * things 2870 */ 2871 net->hb_responded = 1; 2872 2873 if (stcb->asoc.sctp_autoclose_ticks && 2874 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2875 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2876 stcb->sctp_ep, stcb, NULL); 2877 } 2878 /* 2879 * send ASCONF if parameters are pending and ASCONFs are 2880 * allowed (eg. addresses changed when init/cookie echo were 2881 * in flight) 2882 */ 2883 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2884 (stcb->asoc.peer_supports_asconf) && 2885 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2886 #ifdef SCTP_TIMER_BASED_ASCONF 2887 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2888 stcb->sctp_ep, stcb, 2889 stcb->asoc.primary_destination); 2890 #else 2891 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2892 SCTP_ADDR_NOT_LOCKED); 2893 #endif 2894 } 2895 } 2896 /* Toss the cookie if I can */ 2897 sctp_toss_old_cookies(stcb, asoc); 2898 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2899 /* Restart the timer if we have pending data */ 2900 struct sctp_tmit_chunk *chk; 2901 2902 chk = TAILQ_FIRST(&asoc->sent_queue); 2903 if (chk) { 2904 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2905 stcb, chk->whoTo); 2906 } 2907 } 2908 } 2909 2910 static void 2911 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2912 struct sctp_tcb *stcb) 2913 { 2914 struct sctp_nets *net; 2915 struct sctp_tmit_chunk *lchk; 2916 uint32_t tsn; 2917 2918 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2919 return; 2920 } 2921 SCTP_STAT_INCR(sctps_recvecne); 2922 tsn = ntohl(cp->tsn); 2923 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2924 /* Also we make sure we disable the nonce_wait */ 2925 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2926 if (lchk == NULL) { 2927 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2928 } else { 2929 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2930 } 2931 stcb->asoc.nonce_wait_for_ecne = 0; 2932 stcb->asoc.nonce_sum_check = 0; 2933 2934 /* Find where it was sent, if possible */ 2935 net = NULL; 2936 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2937 while (lchk) { 2938 if (lchk->rec.data.TSN_seq == tsn) { 2939 net = lchk->whoTo; 2940 break; 2941 } 2942 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2943 break; 2944 lchk = TAILQ_NEXT(lchk, sctp_next); 2945 } 2946 if (net == NULL) 2947 /* default is we use the primary */ 2948 net = stcb->asoc.primary_destination; 2949 2950 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2951 /* 2952 * JRS - Use the congestion control given in the pluggable 2953 * CC module 2954 */ 2955 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2956 /* 2957 * we reduce once every RTT. So we will only lower cwnd at 2958 * the next sending seq i.e. the resync_tsn. 2959 */ 2960 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2961 } 2962 /* 2963 * We always send a CWR this way if our previous one was lost our 2964 * peer will get an update, or if it is not time again to reduce we 2965 * still get the cwr to the peer. 2966 */ 2967 sctp_send_cwr(stcb, net, tsn); 2968 } 2969 2970 static void 2971 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2972 { 2973 /* 2974 * Here we get a CWR from the peer. We must look in the outqueue and 2975 * make sure that we have a covered ECNE in teh control chunk part. 2976 * If so remove it. 2977 */ 2978 struct sctp_tmit_chunk *chk; 2979 struct sctp_ecne_chunk *ecne; 2980 2981 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2982 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2983 continue; 2984 } 2985 /* 2986 * Look for and remove if it is the right TSN. Since there 2987 * is only ONE ECNE on the control queue at any one time we 2988 * don't need to worry about more than one! 2989 */ 2990 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2991 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2992 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2993 /* this covers this ECNE, we can remove it */ 2994 stcb->asoc.ecn_echo_cnt_onq--; 2995 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2996 sctp_next); 2997 if (chk->data) { 2998 sctp_m_freem(chk->data); 2999 chk->data = NULL; 3000 } 3001 stcb->asoc.ctrl_queue_cnt--; 3002 sctp_free_a_chunk(stcb, chk); 3003 break; 3004 } 3005 } 3006 } 3007 3008 static void 3009 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3010 struct sctp_tcb *stcb, struct sctp_nets *net) 3011 { 3012 struct sctp_association *asoc; 3013 3014 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3015 struct socket *so; 3016 3017 #endif 3018 3019 SCTPDBG(SCTP_DEBUG_INPUT2, 3020 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3021 if (stcb == NULL) 3022 return; 3023 3024 asoc = &stcb->asoc; 3025 /* process according to association state */ 3026 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3027 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3028 SCTPDBG(SCTP_DEBUG_INPUT2, 3029 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3030 SCTP_TCB_UNLOCK(stcb); 3031 return; 3032 } 3033 /* notify upper layer protocol */ 3034 if (stcb->sctp_socket) { 3035 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3036 /* are the queues empty? they should be */ 3037 if (!TAILQ_EMPTY(&asoc->send_queue) || 3038 !TAILQ_EMPTY(&asoc->sent_queue) || 3039 !TAILQ_EMPTY(&asoc->out_wheel)) { 3040 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3041 } 3042 } 3043 /* stop the timer */ 3044 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3045 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3046 /* free the TCB */ 3047 SCTPDBG(SCTP_DEBUG_INPUT2, 3048 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3049 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3050 so = SCTP_INP_SO(stcb->sctp_ep); 3051 atomic_add_int(&stcb->asoc.refcnt, 1); 3052 SCTP_TCB_UNLOCK(stcb); 3053 SCTP_SOCKET_LOCK(so, 1); 3054 SCTP_TCB_LOCK(stcb); 3055 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3056 #endif 3057 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3058 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3059 SCTP_SOCKET_UNLOCK(so, 1); 3060 #endif 3061 return; 3062 } 3063 3064 static int 3065 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3066 struct sctp_nets *net, uint8_t flg) 3067 { 3068 switch (desc->chunk_type) { 3069 case SCTP_DATA: 3070 /* find the tsn to resend (possibly */ 3071 { 3072 uint32_t tsn; 3073 struct sctp_tmit_chunk *tp1; 3074 3075 tsn = ntohl(desc->tsn_ifany); 3076 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3077 while (tp1) { 3078 if (tp1->rec.data.TSN_seq == tsn) { 3079 /* found it */ 3080 break; 3081 } 3082 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3083 MAX_TSN)) { 3084 /* not found */ 3085 tp1 = NULL; 3086 break; 3087 } 3088 tp1 = TAILQ_NEXT(tp1, sctp_next); 3089 } 3090 if (tp1 == NULL) { 3091 /* 3092 * Do it the other way , aka without paying 3093 * attention to queue seq order. 3094 */ 3095 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3096 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3097 while (tp1) { 3098 if (tp1->rec.data.TSN_seq == tsn) { 3099 /* found it */ 3100 break; 3101 } 3102 tp1 = TAILQ_NEXT(tp1, sctp_next); 3103 } 3104 } 3105 if (tp1 == NULL) { 3106 SCTP_STAT_INCR(sctps_pdrptsnnf); 3107 } 3108 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3109 uint8_t *ddp; 3110 3111 if ((stcb->asoc.peers_rwnd == 0) && 3112 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3113 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3114 return (0); 3115 } 3116 if (stcb->asoc.peers_rwnd == 0 && 3117 (flg & SCTP_FROM_MIDDLE_BOX)) { 3118 SCTP_STAT_INCR(sctps_pdrpdizrw); 3119 return (0); 3120 } 3121 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3122 sizeof(struct sctp_data_chunk)); 3123 { 3124 unsigned int iii; 3125 3126 for (iii = 0; iii < sizeof(desc->data_bytes); 3127 iii++) { 3128 if (ddp[iii] != desc->data_bytes[iii]) { 3129 SCTP_STAT_INCR(sctps_pdrpbadd); 3130 return (-1); 3131 } 3132 } 3133 } 3134 /* 3135 * We zero out the nonce so resync not 3136 * needed 3137 */ 3138 tp1->rec.data.ect_nonce = 0; 3139 3140 if (tp1->do_rtt) { 3141 /* 3142 * this guy had a RTO calculation 3143 * pending on it, cancel it 3144 */ 3145 tp1->do_rtt = 0; 3146 } 3147 SCTP_STAT_INCR(sctps_pdrpmark); 3148 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3149 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3150 tp1->sent = SCTP_DATAGRAM_RESEND; 3151 /* 3152 * mark it as if we were doing a FR, since 3153 * we will be getting gap ack reports behind 3154 * the info from the router. 3155 */ 3156 tp1->rec.data.doing_fast_retransmit = 1; 3157 /* 3158 * mark the tsn with what sequences can 3159 * cause a new FR. 3160 */ 3161 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3162 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3163 } else { 3164 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3165 } 3166 3167 /* restart the timer */ 3168 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3169 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3170 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3171 stcb, tp1->whoTo); 3172 3173 /* fix counts and things */ 3174 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3175 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3176 tp1->whoTo->flight_size, 3177 tp1->book_size, 3178 (uintptr_t) stcb, 3179 tp1->rec.data.TSN_seq); 3180 } 3181 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3182 sctp_flight_size_decrease(tp1); 3183 sctp_total_flight_decrease(stcb, tp1); 3184 } 3185 } { 3186 /* audit code */ 3187 unsigned int audit; 3188 3189 audit = 0; 3190 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3191 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3192 audit++; 3193 } 3194 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3195 sctp_next) { 3196 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3197 audit++; 3198 } 3199 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3200 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3201 audit, stcb->asoc.sent_queue_retran_cnt); 3202 #ifndef SCTP_AUDITING_ENABLED 3203 stcb->asoc.sent_queue_retran_cnt = audit; 3204 #endif 3205 } 3206 } 3207 } 3208 break; 3209 case SCTP_ASCONF: 3210 { 3211 struct sctp_tmit_chunk *asconf; 3212 3213 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3214 sctp_next) { 3215 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3216 break; 3217 } 3218 } 3219 if (asconf) { 3220 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3221 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3222 asconf->sent = SCTP_DATAGRAM_RESEND; 3223 asconf->snd_count--; 3224 } 3225 } 3226 break; 3227 case SCTP_INITIATION: 3228 /* resend the INIT */ 3229 stcb->asoc.dropped_special_cnt++; 3230 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3231 /* 3232 * If we can get it in, in a few attempts we do 3233 * this, otherwise we let the timer fire. 3234 */ 3235 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3236 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3237 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3238 } 3239 break; 3240 case SCTP_SELECTIVE_ACK: 3241 /* resend the sack */ 3242 sctp_send_sack(stcb); 3243 break; 3244 /* EY for nr_sacks */ 3245 case SCTP_NR_SELECTIVE_ACK: 3246 sctp_send_nr_sack(stcb); /* EY resend the nr-sack */ 3247 break; 3248 case SCTP_HEARTBEAT_REQUEST: 3249 /* resend a demand HB */ 3250 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3251 /* 3252 * Only retransmit if we KNOW we wont destroy the 3253 * tcb 3254 */ 3255 (void)sctp_send_hb(stcb, 1, net); 3256 } 3257 break; 3258 case SCTP_SHUTDOWN: 3259 sctp_send_shutdown(stcb, net); 3260 break; 3261 case SCTP_SHUTDOWN_ACK: 3262 sctp_send_shutdown_ack(stcb, net); 3263 break; 3264 case SCTP_COOKIE_ECHO: 3265 { 3266 struct sctp_tmit_chunk *cookie; 3267 3268 cookie = NULL; 3269 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3270 sctp_next) { 3271 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3272 break; 3273 } 3274 } 3275 if (cookie) { 3276 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3277 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3278 cookie->sent = SCTP_DATAGRAM_RESEND; 3279 sctp_stop_all_cookie_timers(stcb); 3280 } 3281 } 3282 break; 3283 case SCTP_COOKIE_ACK: 3284 sctp_send_cookie_ack(stcb); 3285 break; 3286 case SCTP_ASCONF_ACK: 3287 /* resend last asconf ack */ 3288 sctp_send_asconf_ack(stcb); 3289 break; 3290 case SCTP_FORWARD_CUM_TSN: 3291 send_forward_tsn(stcb, &stcb->asoc); 3292 break; 3293 /* can't do anything with these */ 3294 case SCTP_PACKET_DROPPED: 3295 case SCTP_INITIATION_ACK: /* this should not happen */ 3296 case SCTP_HEARTBEAT_ACK: 3297 case SCTP_ABORT_ASSOCIATION: 3298 case SCTP_OPERATION_ERROR: 3299 case SCTP_SHUTDOWN_COMPLETE: 3300 case SCTP_ECN_ECHO: 3301 case SCTP_ECN_CWR: 3302 default: 3303 break; 3304 } 3305 return (0); 3306 } 3307 3308 void 3309 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3310 { 3311 int i; 3312 uint16_t temp; 3313 3314 /* 3315 * We set things to 0xffff since this is the last delivered sequence 3316 * and we will be sending in 0 after the reset. 3317 */ 3318 3319 if (number_entries) { 3320 for (i = 0; i < number_entries; i++) { 3321 temp = ntohs(list[i]); 3322 if (temp >= stcb->asoc.streamincnt) { 3323 continue; 3324 } 3325 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3326 } 3327 } else { 3328 list = NULL; 3329 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3330 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3331 } 3332 } 3333 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3334 } 3335 3336 static void 3337 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3338 { 3339 int i; 3340 3341 if (number_entries == 0) { 3342 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3343 stcb->asoc.strmout[i].next_sequence_sent = 0; 3344 } 3345 } else if (number_entries) { 3346 for (i = 0; i < number_entries; i++) { 3347 uint16_t temp; 3348 3349 temp = ntohs(list[i]); 3350 if (temp >= stcb->asoc.streamoutcnt) { 3351 /* no such stream */ 3352 continue; 3353 } 3354 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3355 } 3356 } 3357 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3358 } 3359 3360 3361 struct sctp_stream_reset_out_request * 3362 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3363 { 3364 struct sctp_association *asoc; 3365 struct sctp_stream_reset_out_req *req; 3366 struct sctp_stream_reset_out_request *r; 3367 struct sctp_tmit_chunk *chk; 3368 int len, clen; 3369 3370 asoc = &stcb->asoc; 3371 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3372 asoc->stream_reset_outstanding = 0; 3373 return (NULL); 3374 } 3375 if (stcb->asoc.str_reset == NULL) { 3376 asoc->stream_reset_outstanding = 0; 3377 return (NULL); 3378 } 3379 chk = stcb->asoc.str_reset; 3380 if (chk->data == NULL) { 3381 return (NULL); 3382 } 3383 if (bchk) { 3384 /* he wants a copy of the chk pointer */ 3385 *bchk = chk; 3386 } 3387 clen = chk->send_size; 3388 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3389 r = &req->sr_req; 3390 if (ntohl(r->request_seq) == seq) { 3391 /* found it */ 3392 return (r); 3393 } 3394 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3395 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3396 /* move to the next one, there can only be a max of two */ 3397 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3398 if (ntohl(r->request_seq) == seq) { 3399 return (r); 3400 } 3401 } 3402 /* that seq is not here */ 3403 return (NULL); 3404 } 3405 3406 static void 3407 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3408 { 3409 struct sctp_association *asoc; 3410 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3411 3412 if (stcb->asoc.str_reset == NULL) { 3413 return; 3414 } 3415 asoc = &stcb->asoc; 3416 3417 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3418 TAILQ_REMOVE(&asoc->control_send_queue, 3419 chk, 3420 sctp_next); 3421 if (chk->data) { 3422 sctp_m_freem(chk->data); 3423 chk->data = NULL; 3424 } 3425 asoc->ctrl_queue_cnt--; 3426 sctp_free_a_chunk(stcb, chk); 3427 /* sa_ignore NO_NULL_CHK */ 3428 stcb->asoc.str_reset = NULL; 3429 } 3430 3431 3432 static int 3433 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3434 uint32_t seq, uint32_t action, 3435 struct sctp_stream_reset_response *respin) 3436 { 3437 uint16_t type; 3438 int lparm_len; 3439 struct sctp_association *asoc = &stcb->asoc; 3440 struct sctp_tmit_chunk *chk; 3441 struct sctp_stream_reset_out_request *srparam; 3442 int number_entries; 3443 3444 if (asoc->stream_reset_outstanding == 0) { 3445 /* duplicate */ 3446 return (0); 3447 } 3448 if (seq == stcb->asoc.str_reset_seq_out) { 3449 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3450 if (srparam) { 3451 stcb->asoc.str_reset_seq_out++; 3452 type = ntohs(srparam->ph.param_type); 3453 lparm_len = ntohs(srparam->ph.param_length); 3454 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3455 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3456 asoc->stream_reset_out_is_outstanding = 0; 3457 if (asoc->stream_reset_outstanding) 3458 asoc->stream_reset_outstanding--; 3459 if (action == SCTP_STREAM_RESET_PERFORMED) { 3460 /* do it */ 3461 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3462 } else { 3463 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3464 } 3465 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3466 /* Answered my request */ 3467 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3468 if (asoc->stream_reset_outstanding) 3469 asoc->stream_reset_outstanding--; 3470 if (action != SCTP_STREAM_RESET_PERFORMED) { 3471 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3472 } 3473 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3474 /* Ok we now may have more streams */ 3475 if (asoc->stream_reset_outstanding) 3476 asoc->stream_reset_outstanding--; 3477 if (action == SCTP_STREAM_RESET_PERFORMED) { 3478 /* Put the new streams into effect */ 3479 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3480 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3481 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3482 } else { 3483 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3484 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3485 } 3486 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3487 /** 3488 * a) Adopt the new in tsn. 3489 * b) reset the map 3490 * c) Adopt the new out-tsn 3491 */ 3492 struct sctp_stream_reset_response_tsn *resp; 3493 struct sctp_forward_tsn_chunk fwdtsn; 3494 int abort_flag = 0; 3495 3496 if (respin == NULL) { 3497 /* huh ? */ 3498 return (0); 3499 } 3500 if (action == SCTP_STREAM_RESET_PERFORMED) { 3501 resp = (struct sctp_stream_reset_response_tsn *)respin; 3502 asoc->stream_reset_outstanding--; 3503 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3504 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3505 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3506 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3507 if (abort_flag) { 3508 return (1); 3509 } 3510 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3511 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3512 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3513 } 3514 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3515 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3516 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3517 3518 /* 3519 * EY 05/13/08 - nr_sack: to keep 3520 * nr_mapping array be consistent 3521 * with mapping_array 3522 */ 3523 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3524 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3525 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.mapping_array_base_tsn; 3526 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3527 } 3528 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3529 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3530 3531 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3532 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3533 3534 } 3535 } 3536 /* get rid of the request and get the request flags */ 3537 if (asoc->stream_reset_outstanding == 0) { 3538 sctp_clean_up_stream_reset(stcb); 3539 } 3540 } 3541 } 3542 return (0); 3543 } 3544 3545 static void 3546 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3547 struct sctp_tmit_chunk *chk, 3548 struct sctp_stream_reset_in_request *req, int trunc) 3549 { 3550 uint32_t seq; 3551 int len, i; 3552 int number_entries; 3553 uint16_t temp; 3554 3555 /* 3556 * peer wants me to send a str-reset to him for my outgoing seq's if 3557 * seq_in is right. 3558 */ 3559 struct sctp_association *asoc = &stcb->asoc; 3560 3561 seq = ntohl(req->request_seq); 3562 if (asoc->str_reset_seq_in == seq) { 3563 if (trunc) { 3564 /* Can't do it, since they exceeded our buffer size */ 3565 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3566 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3567 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3568 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3569 len = ntohs(req->ph.param_length); 3570 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3571 for (i = 0; i < number_entries; i++) { 3572 temp = ntohs(req->list_of_streams[i]); 3573 req->list_of_streams[i] = temp; 3574 } 3575 /* move the reset action back one */ 3576 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3577 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3578 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3579 asoc->str_reset_seq_out, 3580 seq, (asoc->sending_seq - 1)); 3581 asoc->stream_reset_out_is_outstanding = 1; 3582 asoc->str_reset = chk; 3583 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3584 stcb->asoc.stream_reset_outstanding++; 3585 } else { 3586 /* Can't do it, since we have sent one out */ 3587 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3588 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3589 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3590 } 3591 asoc->str_reset_seq_in++; 3592 } else if (asoc->str_reset_seq_in - 1 == seq) { 3593 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3594 } else if (asoc->str_reset_seq_in - 2 == seq) { 3595 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3596 } else { 3597 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3598 } 3599 } 3600 3601 static int 3602 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3603 struct sctp_tmit_chunk *chk, 3604 struct sctp_stream_reset_tsn_request *req) 3605 { 3606 /* reset all in and out and update the tsn */ 3607 /* 3608 * A) reset my str-seq's on in and out. B) Select a receive next, 3609 * and set cum-ack to it. Also process this selected number as a 3610 * fwd-tsn as well. C) set in the response my next sending seq. 3611 */ 3612 struct sctp_forward_tsn_chunk fwdtsn; 3613 struct sctp_association *asoc = &stcb->asoc; 3614 int abort_flag = 0; 3615 uint32_t seq; 3616 3617 seq = ntohl(req->request_seq); 3618 if (asoc->str_reset_seq_in == seq) { 3619 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3620 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3621 fwdtsn.ch.chunk_flags = 0; 3622 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3623 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3624 if (abort_flag) { 3625 return (1); 3626 } 3627 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3628 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3629 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3630 } 3631 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3632 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3633 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3634 /* 3635 * EY 05/13/08 -nr_sack: to keep nr_mapping array consistent 3636 * with mapping array 3637 */ 3638 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3639 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3640 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3641 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3642 } 3643 atomic_add_int(&stcb->asoc.sending_seq, 1); 3644 /* save off historical data for retrans */ 3645 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3646 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3647 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3648 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3649 3650 sctp_add_stream_reset_result_tsn(chk, 3651 ntohl(req->request_seq), 3652 SCTP_STREAM_RESET_PERFORMED, 3653 stcb->asoc.sending_seq, 3654 stcb->asoc.mapping_array_base_tsn); 3655 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3656 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3657 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3658 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3659 3660 asoc->str_reset_seq_in++; 3661 } else if (asoc->str_reset_seq_in - 1 == seq) { 3662 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3663 stcb->asoc.last_sending_seq[0], 3664 stcb->asoc.last_base_tsnsent[0] 3665 ); 3666 } else if (asoc->str_reset_seq_in - 2 == seq) { 3667 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3668 stcb->asoc.last_sending_seq[1], 3669 stcb->asoc.last_base_tsnsent[1] 3670 ); 3671 } else { 3672 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3673 } 3674 return (0); 3675 } 3676 3677 static void 3678 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3679 struct sctp_tmit_chunk *chk, 3680 struct sctp_stream_reset_out_request *req, int trunc) 3681 { 3682 uint32_t seq, tsn; 3683 int number_entries, len; 3684 struct sctp_association *asoc = &stcb->asoc; 3685 3686 seq = ntohl(req->request_seq); 3687 3688 /* now if its not a duplicate we process it */ 3689 if (asoc->str_reset_seq_in == seq) { 3690 len = ntohs(req->ph.param_length); 3691 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3692 /* 3693 * the sender is resetting, handle the list issue.. we must 3694 * a) verify if we can do the reset, if so no problem b) If 3695 * we can't do the reset we must copy the request. c) queue 3696 * it, and setup the data in processor to trigger it off 3697 * when needed and dequeue all the queued data. 3698 */ 3699 tsn = ntohl(req->send_reset_at_tsn); 3700 3701 /* move the reset action back one */ 3702 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3703 if (trunc) { 3704 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3705 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3706 } else if ((tsn == asoc->cumulative_tsn) || 3707 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3708 /* we can do it now */ 3709 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3710 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3711 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3712 } else { 3713 /* 3714 * we must queue it up and thus wait for the TSN's 3715 * to arrive that are at or before tsn 3716 */ 3717 struct sctp_stream_reset_list *liste; 3718 int siz; 3719 3720 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3721 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3722 siz, SCTP_M_STRESET); 3723 if (liste == NULL) { 3724 /* gak out of memory */ 3725 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3726 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3727 return; 3728 } 3729 liste->tsn = tsn; 3730 liste->number_entries = number_entries; 3731 memcpy(&liste->req, req, 3732 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3733 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3734 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3735 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3736 } 3737 asoc->str_reset_seq_in++; 3738 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3739 /* 3740 * one seq back, just echo back last action since my 3741 * response was lost. 3742 */ 3743 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3744 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3745 /* 3746 * two seq back, just echo back last action since my 3747 * response was lost. 3748 */ 3749 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3750 } else { 3751 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3752 } 3753 } 3754 3755 static void 3756 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3757 struct sctp_stream_reset_add_strm *str_add) 3758 { 3759 /* 3760 * Peer is requesting to add more streams. If its within our 3761 * max-streams we will allow it. 3762 */ 3763 uint16_t num_stream, i; 3764 uint32_t seq; 3765 struct sctp_association *asoc = &stcb->asoc; 3766 struct sctp_queued_to_read *ctl; 3767 3768 /* Get the number. */ 3769 seq = ntohl(str_add->request_seq); 3770 num_stream = ntohs(str_add->number_of_streams); 3771 /* Now what would be the new total? */ 3772 if (asoc->str_reset_seq_in == seq) { 3773 num_stream += stcb->asoc.streamincnt; 3774 if (num_stream > stcb->asoc.max_inbound_streams) { 3775 /* We must reject it they ask for to many */ 3776 denied: 3777 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3778 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3779 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3780 } else { 3781 /* Ok, we can do that :-) */ 3782 struct sctp_stream_in *oldstrm; 3783 3784 /* save off the old */ 3785 oldstrm = stcb->asoc.strmin; 3786 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3787 (num_stream * sizeof(struct sctp_stream_in)), 3788 SCTP_M_STRMI); 3789 if (stcb->asoc.strmin == NULL) { 3790 stcb->asoc.strmin = oldstrm; 3791 goto denied; 3792 } 3793 /* copy off the old data */ 3794 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3795 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3796 stcb->asoc.strmin[i].stream_no = i; 3797 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3798 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3799 /* now anything on those queues? */ 3800 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) { 3801 ctl = TAILQ_FIRST(&oldstrm[i].inqueue); 3802 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3803 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3804 } 3805 } 3806 /* Init the new streams */ 3807 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3808 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3809 stcb->asoc.strmin[i].stream_no = i; 3810 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3811 stcb->asoc.strmin[i].delivery_started = 0; 3812 } 3813 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3814 /* update the size */ 3815 stcb->asoc.streamincnt = num_stream; 3816 /* Send the ack */ 3817 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3818 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3819 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3820 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3821 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3822 } 3823 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3824 /* 3825 * one seq back, just echo back last action since my 3826 * response was lost. 3827 */ 3828 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3829 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3830 /* 3831 * two seq back, just echo back last action since my 3832 * response was lost. 3833 */ 3834 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3835 } else { 3836 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3837 3838 } 3839 } 3840 3841 #ifdef __GNUC__ 3842 __attribute__((noinline)) 3843 #endif 3844 static int 3845 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3846 struct sctp_stream_reset_out_req *sr_req) 3847 { 3848 int chk_length, param_len, ptype; 3849 struct sctp_paramhdr pstore; 3850 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3851 3852 uint32_t seq; 3853 int num_req = 0; 3854 int trunc = 0; 3855 struct sctp_tmit_chunk *chk; 3856 struct sctp_chunkhdr *ch; 3857 struct sctp_paramhdr *ph; 3858 int ret_code = 0; 3859 int num_param = 0; 3860 3861 /* now it may be a reset or a reset-response */ 3862 chk_length = ntohs(sr_req->ch.chunk_length); 3863 3864 /* setup for adding the response */ 3865 sctp_alloc_a_chunk(stcb, chk); 3866 if (chk == NULL) { 3867 return (ret_code); 3868 } 3869 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3870 chk->rec.chunk_id.can_take_data = 0; 3871 chk->asoc = &stcb->asoc; 3872 chk->no_fr_allowed = 0; 3873 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3874 chk->book_size_scale = 0; 3875 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3876 if (chk->data == NULL) { 3877 strres_nochunk: 3878 if (chk->data) { 3879 sctp_m_freem(chk->data); 3880 chk->data = NULL; 3881 } 3882 sctp_free_a_chunk(stcb, chk); 3883 return (ret_code); 3884 } 3885 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3886 3887 /* setup chunk parameters */ 3888 chk->sent = SCTP_DATAGRAM_UNSENT; 3889 chk->snd_count = 0; 3890 chk->whoTo = stcb->asoc.primary_destination; 3891 atomic_add_int(&chk->whoTo->ref_count, 1); 3892 3893 ch = mtod(chk->data, struct sctp_chunkhdr *); 3894 ch->chunk_type = SCTP_STREAM_RESET; 3895 ch->chunk_flags = 0; 3896 ch->chunk_length = htons(chk->send_size); 3897 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3898 offset += sizeof(struct sctp_chunkhdr); 3899 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3900 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3901 if (ph == NULL) 3902 break; 3903 param_len = ntohs(ph->param_length); 3904 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3905 /* bad param */ 3906 break; 3907 } 3908 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3909 (uint8_t *) & cstore); 3910 ptype = ntohs(ph->param_type); 3911 num_param++; 3912 if (param_len > (int)sizeof(cstore)) { 3913 trunc = 1; 3914 } else { 3915 trunc = 0; 3916 } 3917 3918 if (num_param > SCTP_MAX_RESET_PARAMS) { 3919 /* hit the max of parameters already sorry.. */ 3920 break; 3921 } 3922 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3923 struct sctp_stream_reset_out_request *req_out; 3924 3925 req_out = (struct sctp_stream_reset_out_request *)ph; 3926 num_req++; 3927 if (stcb->asoc.stream_reset_outstanding) { 3928 seq = ntohl(req_out->response_seq); 3929 if (seq == stcb->asoc.str_reset_seq_out) { 3930 /* implicit ack */ 3931 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3932 } 3933 } 3934 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3935 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3936 struct sctp_stream_reset_add_strm *str_add; 3937 3938 str_add = (struct sctp_stream_reset_add_strm *)ph; 3939 num_req++; 3940 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3941 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3942 struct sctp_stream_reset_in_request *req_in; 3943 3944 num_req++; 3945 3946 req_in = (struct sctp_stream_reset_in_request *)ph; 3947 3948 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3949 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3950 struct sctp_stream_reset_tsn_request *req_tsn; 3951 3952 num_req++; 3953 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3954 3955 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3956 ret_code = 1; 3957 goto strres_nochunk; 3958 } 3959 /* no more */ 3960 break; 3961 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3962 struct sctp_stream_reset_response *resp; 3963 uint32_t result; 3964 3965 resp = (struct sctp_stream_reset_response *)ph; 3966 seq = ntohl(resp->response_seq); 3967 result = ntohl(resp->result); 3968 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3969 ret_code = 1; 3970 goto strres_nochunk; 3971 } 3972 } else { 3973 break; 3974 } 3975 offset += SCTP_SIZE32(param_len); 3976 chk_length -= SCTP_SIZE32(param_len); 3977 } 3978 if (num_req == 0) { 3979 /* we have no response free the stuff */ 3980 goto strres_nochunk; 3981 } 3982 /* ok we have a chunk to link in */ 3983 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3984 chk, 3985 sctp_next); 3986 stcb->asoc.ctrl_queue_cnt++; 3987 return (ret_code); 3988 } 3989 3990 /* 3991 * Handle a router or endpoints report of a packet loss, there are two ways 3992 * to handle this, either we get the whole packet and must disect it 3993 * ourselves (possibly with truncation and or corruption) or it is a summary 3994 * from a middle box that did the disectting for us. 3995 */ 3996 static void 3997 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3998 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3999 { 4000 uint32_t bottle_bw, on_queue; 4001 uint16_t trunc_len; 4002 unsigned int chlen; 4003 unsigned int at; 4004 struct sctp_chunk_desc desc; 4005 struct sctp_chunkhdr *ch; 4006 4007 chlen = ntohs(cp->ch.chunk_length); 4008 chlen -= sizeof(struct sctp_pktdrop_chunk); 4009 /* XXX possible chlen underflow */ 4010 if (chlen == 0) { 4011 ch = NULL; 4012 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4013 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4014 } else { 4015 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4016 chlen -= sizeof(struct sctphdr); 4017 /* XXX possible chlen underflow */ 4018 memset(&desc, 0, sizeof(desc)); 4019 } 4020 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4021 if (trunc_len > limit) { 4022 trunc_len = limit; 4023 } 4024 /* now the chunks themselves */ 4025 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4026 desc.chunk_type = ch->chunk_type; 4027 /* get amount we need to move */ 4028 at = ntohs(ch->chunk_length); 4029 if (at < sizeof(struct sctp_chunkhdr)) { 4030 /* corrupt chunk, maybe at the end? */ 4031 SCTP_STAT_INCR(sctps_pdrpcrupt); 4032 break; 4033 } 4034 if (trunc_len == 0) { 4035 /* we are supposed to have all of it */ 4036 if (at > chlen) { 4037 /* corrupt skip it */ 4038 SCTP_STAT_INCR(sctps_pdrpcrupt); 4039 break; 4040 } 4041 } else { 4042 /* is there enough of it left ? */ 4043 if (desc.chunk_type == SCTP_DATA) { 4044 if (chlen < (sizeof(struct sctp_data_chunk) + 4045 sizeof(desc.data_bytes))) { 4046 break; 4047 } 4048 } else { 4049 if (chlen < sizeof(struct sctp_chunkhdr)) { 4050 break; 4051 } 4052 } 4053 } 4054 if (desc.chunk_type == SCTP_DATA) { 4055 /* can we get out the tsn? */ 4056 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4057 SCTP_STAT_INCR(sctps_pdrpmbda); 4058 4059 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4060 /* yep */ 4061 struct sctp_data_chunk *dcp; 4062 uint8_t *ddp; 4063 unsigned int iii; 4064 4065 dcp = (struct sctp_data_chunk *)ch; 4066 ddp = (uint8_t *) (dcp + 1); 4067 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4068 desc.data_bytes[iii] = ddp[iii]; 4069 } 4070 desc.tsn_ifany = dcp->dp.tsn; 4071 } else { 4072 /* nope we are done. */ 4073 SCTP_STAT_INCR(sctps_pdrpnedat); 4074 break; 4075 } 4076 } else { 4077 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4078 SCTP_STAT_INCR(sctps_pdrpmbct); 4079 } 4080 4081 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4082 SCTP_STAT_INCR(sctps_pdrppdbrk); 4083 break; 4084 } 4085 if (SCTP_SIZE32(at) > chlen) { 4086 break; 4087 } 4088 chlen -= SCTP_SIZE32(at); 4089 if (chlen < sizeof(struct sctp_chunkhdr)) { 4090 /* done, none left */ 4091 break; 4092 } 4093 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4094 } 4095 /* Now update any rwnd --- possibly */ 4096 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4097 /* From a peer, we get a rwnd report */ 4098 uint32_t a_rwnd; 4099 4100 SCTP_STAT_INCR(sctps_pdrpfehos); 4101 4102 bottle_bw = ntohl(cp->bottle_bw); 4103 on_queue = ntohl(cp->current_onq); 4104 if (bottle_bw && on_queue) { 4105 /* a rwnd report is in here */ 4106 if (bottle_bw > on_queue) 4107 a_rwnd = bottle_bw - on_queue; 4108 else 4109 a_rwnd = 0; 4110 4111 if (a_rwnd == 0) 4112 stcb->asoc.peers_rwnd = 0; 4113 else { 4114 if (a_rwnd > stcb->asoc.total_flight) { 4115 stcb->asoc.peers_rwnd = 4116 a_rwnd - stcb->asoc.total_flight; 4117 } else { 4118 stcb->asoc.peers_rwnd = 0; 4119 } 4120 if (stcb->asoc.peers_rwnd < 4121 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4122 /* SWS sender side engages */ 4123 stcb->asoc.peers_rwnd = 0; 4124 } 4125 } 4126 } 4127 } else { 4128 SCTP_STAT_INCR(sctps_pdrpfmbox); 4129 } 4130 4131 /* now middle boxes in sat networks get a cwnd bump */ 4132 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4133 (stcb->asoc.sat_t3_loss_recovery == 0) && 4134 (stcb->asoc.sat_network)) { 4135 /* 4136 * This is debateable but for sat networks it makes sense 4137 * Note if a T3 timer has went off, we will prohibit any 4138 * changes to cwnd until we exit the t3 loss recovery. 4139 */ 4140 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4141 net, cp, &bottle_bw, &on_queue); 4142 } 4143 } 4144 4145 /* 4146 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4147 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4148 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4149 * length of the complete packet outputs: - length: modified to remaining 4150 * length after control processing - netp: modified to new sctp_nets after 4151 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4152 * bad packet,...) otherwise return the tcb for this packet 4153 */ 4154 #ifdef __GNUC__ 4155 __attribute__((noinline)) 4156 #endif 4157 static struct sctp_tcb * 4158 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4159 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4160 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4161 uint32_t vrf_id, uint16_t port) 4162 { 4163 struct sctp_association *asoc; 4164 uint32_t vtag_in; 4165 int num_chunks = 0; /* number of control chunks processed */ 4166 uint32_t chk_length; 4167 int ret; 4168 int abort_no_unlock = 0; 4169 4170 /* 4171 * How big should this be, and should it be alloc'd? Lets try the 4172 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4173 * until we get into jumbo grams and such.. 4174 */ 4175 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4176 struct sctp_tcb *locked_tcb = stcb; 4177 int got_auth = 0; 4178 uint32_t auth_offset = 0, auth_len = 0; 4179 int auth_skipped = 0; 4180 int asconf_cnt = 0; 4181 4182 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4183 struct socket *so; 4184 4185 #endif 4186 4187 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4188 iphlen, *offset, length, stcb); 4189 4190 /* validate chunk header length... */ 4191 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4192 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4193 ntohs(ch->chunk_length)); 4194 if (locked_tcb) { 4195 SCTP_TCB_UNLOCK(locked_tcb); 4196 } 4197 return (NULL); 4198 } 4199 /* 4200 * validate the verification tag 4201 */ 4202 vtag_in = ntohl(sh->v_tag); 4203 4204 if (locked_tcb) { 4205 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4206 } 4207 if (ch->chunk_type == SCTP_INITIATION) { 4208 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4209 ntohs(ch->chunk_length), vtag_in); 4210 if (vtag_in != 0) { 4211 /* protocol error- silently discard... */ 4212 SCTP_STAT_INCR(sctps_badvtag); 4213 if (locked_tcb) { 4214 SCTP_TCB_UNLOCK(locked_tcb); 4215 } 4216 return (NULL); 4217 } 4218 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4219 /* 4220 * If there is no stcb, skip the AUTH chunk and process 4221 * later after a stcb is found (to validate the lookup was 4222 * valid. 4223 */ 4224 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4225 (stcb == NULL) && 4226 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4227 /* save this chunk for later processing */ 4228 auth_skipped = 1; 4229 auth_offset = *offset; 4230 auth_len = ntohs(ch->chunk_length); 4231 4232 /* (temporarily) move past this chunk */ 4233 *offset += SCTP_SIZE32(auth_len); 4234 if (*offset >= length) { 4235 /* no more data left in the mbuf chain */ 4236 *offset = length; 4237 if (locked_tcb) { 4238 SCTP_TCB_UNLOCK(locked_tcb); 4239 } 4240 return (NULL); 4241 } 4242 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4243 sizeof(struct sctp_chunkhdr), chunk_buf); 4244 } 4245 if (ch == NULL) { 4246 /* Help */ 4247 *offset = length; 4248 if (locked_tcb) { 4249 SCTP_TCB_UNLOCK(locked_tcb); 4250 } 4251 return (NULL); 4252 } 4253 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4254 goto process_control_chunks; 4255 } 4256 /* 4257 * first check if it's an ASCONF with an unknown src addr we 4258 * need to look inside to find the association 4259 */ 4260 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4261 struct sctp_chunkhdr *asconf_ch = ch; 4262 uint32_t asconf_offset = 0, asconf_len = 0; 4263 4264 /* inp's refcount may be reduced */ 4265 SCTP_INP_INCR_REF(inp); 4266 4267 asconf_offset = *offset; 4268 do { 4269 asconf_len = ntohs(asconf_ch->chunk_length); 4270 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4271 break; 4272 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4273 *offset, sh, &inp, netp, vrf_id); 4274 if (stcb != NULL) 4275 break; 4276 asconf_offset += SCTP_SIZE32(asconf_len); 4277 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4278 sizeof(struct sctp_chunkhdr), chunk_buf); 4279 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4280 if (stcb == NULL) { 4281 /* 4282 * reduce inp's refcount if not reduced in 4283 * sctp_findassociation_ep_asconf(). 4284 */ 4285 SCTP_INP_DECR_REF(inp); 4286 } else { 4287 locked_tcb = stcb; 4288 } 4289 4290 /* now go back and verify any auth chunk to be sure */ 4291 if (auth_skipped && (stcb != NULL)) { 4292 struct sctp_auth_chunk *auth; 4293 4294 auth = (struct sctp_auth_chunk *) 4295 sctp_m_getptr(m, auth_offset, 4296 auth_len, chunk_buf); 4297 got_auth = 1; 4298 auth_skipped = 0; 4299 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4300 auth_offset)) { 4301 /* auth HMAC failed so dump it */ 4302 *offset = length; 4303 if (locked_tcb) { 4304 SCTP_TCB_UNLOCK(locked_tcb); 4305 } 4306 return (NULL); 4307 } else { 4308 /* remaining chunks are HMAC checked */ 4309 stcb->asoc.authenticated = 1; 4310 } 4311 } 4312 } 4313 if (stcb == NULL) { 4314 /* no association, so it's out of the blue... */ 4315 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4316 vrf_id, port); 4317 *offset = length; 4318 if (locked_tcb) { 4319 SCTP_TCB_UNLOCK(locked_tcb); 4320 } 4321 return (NULL); 4322 } 4323 asoc = &stcb->asoc; 4324 /* ABORT and SHUTDOWN can use either v_tag... */ 4325 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4326 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4327 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4328 if ((vtag_in == asoc->my_vtag) || 4329 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4330 (vtag_in == asoc->peer_vtag))) { 4331 /* this is valid */ 4332 } else { 4333 /* drop this packet... */ 4334 SCTP_STAT_INCR(sctps_badvtag); 4335 if (locked_tcb) { 4336 SCTP_TCB_UNLOCK(locked_tcb); 4337 } 4338 return (NULL); 4339 } 4340 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4341 if (vtag_in != asoc->my_vtag) { 4342 /* 4343 * this could be a stale SHUTDOWN-ACK or the 4344 * peer never got the SHUTDOWN-COMPLETE and 4345 * is still hung; we have started a new asoc 4346 * but it won't complete until the shutdown 4347 * is completed 4348 */ 4349 if (locked_tcb) { 4350 SCTP_TCB_UNLOCK(locked_tcb); 4351 } 4352 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4353 NULL, vrf_id, port); 4354 return (NULL); 4355 } 4356 } else { 4357 /* for all other chunks, vtag must match */ 4358 if (vtag_in != asoc->my_vtag) { 4359 /* invalid vtag... */ 4360 SCTPDBG(SCTP_DEBUG_INPUT3, 4361 "invalid vtag: %xh, expect %xh\n", 4362 vtag_in, asoc->my_vtag); 4363 SCTP_STAT_INCR(sctps_badvtag); 4364 if (locked_tcb) { 4365 SCTP_TCB_UNLOCK(locked_tcb); 4366 } 4367 *offset = length; 4368 return (NULL); 4369 } 4370 } 4371 } /* end if !SCTP_COOKIE_ECHO */ 4372 /* 4373 * process all control chunks... 4374 */ 4375 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4376 /* EY */ 4377 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4378 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4379 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4380 /* implied cookie-ack.. we must have lost the ack */ 4381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4382 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4383 stcb->asoc.overall_error_count, 4384 0, 4385 SCTP_FROM_SCTP_INPUT, 4386 __LINE__); 4387 } 4388 stcb->asoc.overall_error_count = 0; 4389 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4390 *netp); 4391 } 4392 process_control_chunks: 4393 while (IS_SCTP_CONTROL(ch)) { 4394 /* validate chunk length */ 4395 chk_length = ntohs(ch->chunk_length); 4396 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4397 ch->chunk_type, chk_length); 4398 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4399 if (chk_length < sizeof(*ch) || 4400 (*offset + (int)chk_length) > length) { 4401 *offset = length; 4402 if (locked_tcb) { 4403 SCTP_TCB_UNLOCK(locked_tcb); 4404 } 4405 return (NULL); 4406 } 4407 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4408 /* 4409 * INIT-ACK only gets the init ack "header" portion only 4410 * because we don't have to process the peer's COOKIE. All 4411 * others get a complete chunk. 4412 */ 4413 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4414 (ch->chunk_type == SCTP_INITIATION)) { 4415 /* get an init-ack chunk */ 4416 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4417 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4418 if (ch == NULL) { 4419 *offset = length; 4420 if (locked_tcb) { 4421 SCTP_TCB_UNLOCK(locked_tcb); 4422 } 4423 return (NULL); 4424 } 4425 } else { 4426 /* For cookies and all other chunks. */ 4427 if (chk_length > sizeof(chunk_buf)) { 4428 /* 4429 * use just the size of the chunk buffer so 4430 * the front part of our chunks fit in 4431 * contiguous space up to the chunk buffer 4432 * size (508 bytes). For chunks that need to 4433 * get more than that they must use the 4434 * sctp_m_getptr() function or other means 4435 * (e.g. know how to parse mbuf chains). 4436 * Cookies do this already. 4437 */ 4438 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4439 (sizeof(chunk_buf) - 4), 4440 chunk_buf); 4441 if (ch == NULL) { 4442 *offset = length; 4443 if (locked_tcb) { 4444 SCTP_TCB_UNLOCK(locked_tcb); 4445 } 4446 return (NULL); 4447 } 4448 } else { 4449 /* We can fit it all */ 4450 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4451 chk_length, chunk_buf); 4452 if (ch == NULL) { 4453 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4454 *offset = length; 4455 if (locked_tcb) { 4456 SCTP_TCB_UNLOCK(locked_tcb); 4457 } 4458 return (NULL); 4459 } 4460 } 4461 } 4462 num_chunks++; 4463 /* Save off the last place we got a control from */ 4464 if (stcb != NULL) { 4465 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4466 /* 4467 * allow last_control to be NULL if 4468 * ASCONF... ASCONF processing will find the 4469 * right net later 4470 */ 4471 if ((netp != NULL) && (*netp != NULL)) 4472 stcb->asoc.last_control_chunk_from = *netp; 4473 } 4474 } 4475 #ifdef SCTP_AUDITING_ENABLED 4476 sctp_audit_log(0xB0, ch->chunk_type); 4477 #endif 4478 4479 /* check to see if this chunk required auth, but isn't */ 4480 if ((stcb != NULL) && 4481 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4482 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4483 !stcb->asoc.authenticated) { 4484 /* "silently" ignore */ 4485 SCTP_STAT_INCR(sctps_recvauthmissing); 4486 goto next_chunk; 4487 } 4488 switch (ch->chunk_type) { 4489 case SCTP_INITIATION: 4490 /* must be first and only chunk */ 4491 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4492 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4493 /* We are not interested anymore? */ 4494 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4495 /* 4496 * collision case where we are 4497 * sending to them too 4498 */ 4499 ; 4500 } else { 4501 if (locked_tcb) { 4502 SCTP_TCB_UNLOCK(locked_tcb); 4503 } 4504 *offset = length; 4505 return (NULL); 4506 } 4507 } 4508 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4509 (num_chunks > 1) || 4510 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4511 *offset = length; 4512 if (locked_tcb) { 4513 SCTP_TCB_UNLOCK(locked_tcb); 4514 } 4515 return (NULL); 4516 } 4517 if ((stcb != NULL) && 4518 (SCTP_GET_STATE(&stcb->asoc) == 4519 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4520 sctp_send_shutdown_ack(stcb, 4521 stcb->asoc.primary_destination); 4522 *offset = length; 4523 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4524 if (locked_tcb) { 4525 SCTP_TCB_UNLOCK(locked_tcb); 4526 } 4527 return (NULL); 4528 } 4529 if (netp) { 4530 sctp_handle_init(m, iphlen, *offset, sh, 4531 (struct sctp_init_chunk *)ch, inp, 4532 stcb, *netp, &abort_no_unlock, vrf_id, port); 4533 } 4534 if (abort_no_unlock) 4535 return (NULL); 4536 4537 *offset = length; 4538 if (locked_tcb) { 4539 SCTP_TCB_UNLOCK(locked_tcb); 4540 } 4541 return (NULL); 4542 break; 4543 case SCTP_PAD_CHUNK: 4544 break; 4545 case SCTP_INITIATION_ACK: 4546 /* must be first and only chunk */ 4547 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4548 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4549 /* We are not interested anymore */ 4550 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4551 ; 4552 } else { 4553 if (locked_tcb) { 4554 SCTP_TCB_UNLOCK(locked_tcb); 4555 } 4556 *offset = length; 4557 if (stcb) { 4558 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4559 so = SCTP_INP_SO(inp); 4560 atomic_add_int(&stcb->asoc.refcnt, 1); 4561 SCTP_TCB_UNLOCK(stcb); 4562 SCTP_SOCKET_LOCK(so, 1); 4563 SCTP_TCB_LOCK(stcb); 4564 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4565 #endif 4566 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4567 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4568 SCTP_SOCKET_UNLOCK(so, 1); 4569 #endif 4570 } 4571 return (NULL); 4572 } 4573 } 4574 if ((num_chunks > 1) || 4575 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4576 *offset = length; 4577 if (locked_tcb) { 4578 SCTP_TCB_UNLOCK(locked_tcb); 4579 } 4580 return (NULL); 4581 } 4582 if ((netp) && (*netp)) { 4583 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4584 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4585 } else { 4586 ret = -1; 4587 } 4588 /* 4589 * Special case, I must call the output routine to 4590 * get the cookie echoed 4591 */ 4592 if (abort_no_unlock) 4593 return (NULL); 4594 4595 if ((stcb) && ret == 0) 4596 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4597 *offset = length; 4598 if (locked_tcb) { 4599 SCTP_TCB_UNLOCK(locked_tcb); 4600 } 4601 return (NULL); 4602 break; 4603 case SCTP_SELECTIVE_ACK: 4604 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4605 SCTP_STAT_INCR(sctps_recvsacks); 4606 { 4607 struct sctp_sack_chunk *sack; 4608 int abort_now = 0; 4609 uint32_t a_rwnd, cum_ack; 4610 uint16_t num_seg, num_dup; 4611 uint8_t flags; 4612 int offset_seg, offset_dup; 4613 int nonce_sum_flag; 4614 4615 if (stcb == NULL) { 4616 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4617 break; 4618 } 4619 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4620 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4621 break; 4622 } 4623 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4624 /*- 4625 * If we have sent a shutdown-ack, we will pay no 4626 * attention to a sack sent in to us since 4627 * we don't care anymore. 4628 */ 4629 break; 4630 } 4631 sack = (struct sctp_sack_chunk *)ch; 4632 flags = ch->chunk_flags; 4633 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4634 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4635 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4636 num_dup = ntohs(sack->sack.num_dup_tsns); 4637 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4638 if (sizeof(struct sctp_sack_chunk) + 4639 num_seg * sizeof(struct sctp_gap_ack_block) + 4640 num_dup * sizeof(uint32_t) != chk_length) { 4641 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4642 break; 4643 } 4644 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4645 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4646 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4647 cum_ack, num_seg, a_rwnd); 4648 stcb->asoc.seen_a_sack_this_pkt = 1; 4649 if ((stcb->asoc.pr_sctp_cnt == 0) && 4650 (num_seg == 0) && 4651 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4652 (cum_ack == stcb->asoc.last_acked_seq)) && 4653 (stcb->asoc.saw_sack_with_frags == 0) && 4654 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4655 ) { 4656 /* 4657 * We have a SIMPLE sack having no 4658 * prior segments and data on sent 4659 * queue to be acked.. Use the 4660 * faster path sack processing. We 4661 * also allow window update sacks 4662 * with no missing segments to go 4663 * this way too. 4664 */ 4665 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4666 &abort_now); 4667 } else { 4668 if (netp && *netp) 4669 sctp_handle_sack(m, offset_seg, offset_dup, 4670 stcb, *netp, 4671 num_seg, 0, num_dup, &abort_now, flags, 4672 cum_ack, a_rwnd); 4673 } 4674 if (abort_now) { 4675 /* ABORT signal from sack processing */ 4676 *offset = length; 4677 return (NULL); 4678 } 4679 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4680 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4681 (stcb->asoc.stream_queue_cnt == 0)) { 4682 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4683 } 4684 } 4685 break; 4686 /* 4687 * EY - nr_sack: If the received chunk is an 4688 * nr_sack chunk 4689 */ 4690 case SCTP_NR_SELECTIVE_ACK: 4691 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4692 SCTP_STAT_INCR(sctps_recvsacks); 4693 { 4694 struct sctp_nr_sack_chunk *nr_sack; 4695 int abort_now = 0; 4696 uint32_t a_rwnd, cum_ack; 4697 uint16_t num_seg, num_nr_seg, num_dup; 4698 uint8_t flags; 4699 int offset_seg, offset_dup; 4700 int nonce_sum_flag; 4701 4702 /* 4703 * EY nr_sacks have not been negotiated but 4704 * the peer end sent an nr_sack, silently 4705 * discard the chunk 4706 */ 4707 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && 4708 stcb->asoc.peer_supports_nr_sack)) { 4709 goto unknown_chunk; 4710 } 4711 if (stcb == NULL) { 4712 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4713 break; 4714 } 4715 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4716 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4717 break; 4718 } 4719 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4720 /*- 4721 * If we have sent a shutdown-ack, we will pay no 4722 * attention to a sack sent in to us since 4723 * we don't care anymore. 4724 */ 4725 break; 4726 } 4727 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4728 flags = ch->chunk_flags; 4729 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4730 4731 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4732 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4733 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4734 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4735 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4736 if (sizeof(struct sctp_nr_sack_chunk) + 4737 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4738 num_dup * sizeof(uint32_t) != chk_length) { 4739 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4740 break; 4741 } 4742 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4743 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4744 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4745 cum_ack, num_seg, a_rwnd); 4746 stcb->asoc.seen_a_sack_this_pkt = 1; 4747 if ((stcb->asoc.pr_sctp_cnt == 0) && 4748 (num_seg == 0) && (num_nr_seg == 0) && 4749 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4750 (cum_ack == stcb->asoc.last_acked_seq)) && 4751 (stcb->asoc.saw_sack_with_frags == 0) && 4752 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4753 /* 4754 * We have a SIMPLE sack having no 4755 * prior segments and data on sent 4756 * queue to be acked. Use the faster 4757 * path sack processing. We also 4758 * allow window update sacks with no 4759 * missing segments to go this way 4760 * too. 4761 */ 4762 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4763 &abort_now); 4764 } else { 4765 if (netp && *netp) 4766 sctp_handle_sack(m, offset_seg, offset_dup, 4767 stcb, *netp, 4768 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4769 cum_ack, a_rwnd); 4770 } 4771 if (abort_now) { 4772 /* ABORT signal from sack processing */ 4773 *offset = length; 4774 return (NULL); 4775 } 4776 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4777 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4778 (stcb->asoc.stream_queue_cnt == 0)) { 4779 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4780 } 4781 } 4782 break; 4783 4784 case SCTP_HEARTBEAT_REQUEST: 4785 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4786 if ((stcb) && netp && *netp) { 4787 SCTP_STAT_INCR(sctps_recvheartbeat); 4788 sctp_send_heartbeat_ack(stcb, m, *offset, 4789 chk_length, *netp); 4790 4791 /* He's alive so give him credit */ 4792 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4793 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4794 stcb->asoc.overall_error_count, 4795 0, 4796 SCTP_FROM_SCTP_INPUT, 4797 __LINE__); 4798 } 4799 stcb->asoc.overall_error_count = 0; 4800 } 4801 break; 4802 case SCTP_HEARTBEAT_ACK: 4803 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4804 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4805 /* Its not ours */ 4806 *offset = length; 4807 if (locked_tcb) { 4808 SCTP_TCB_UNLOCK(locked_tcb); 4809 } 4810 return (NULL); 4811 } 4812 /* He's alive so give him credit */ 4813 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4814 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4815 stcb->asoc.overall_error_count, 4816 0, 4817 SCTP_FROM_SCTP_INPUT, 4818 __LINE__); 4819 } 4820 stcb->asoc.overall_error_count = 0; 4821 SCTP_STAT_INCR(sctps_recvheartbeatack); 4822 if (netp && *netp) 4823 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4824 stcb, *netp); 4825 break; 4826 case SCTP_ABORT_ASSOCIATION: 4827 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4828 stcb); 4829 if ((stcb) && netp && *netp) 4830 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4831 stcb, *netp); 4832 *offset = length; 4833 return (NULL); 4834 break; 4835 case SCTP_SHUTDOWN: 4836 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4837 stcb); 4838 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4839 *offset = length; 4840 if (locked_tcb) { 4841 SCTP_TCB_UNLOCK(locked_tcb); 4842 } 4843 return (NULL); 4844 } 4845 if (netp && *netp) { 4846 int abort_flag = 0; 4847 4848 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4849 stcb, *netp, &abort_flag); 4850 if (abort_flag) { 4851 *offset = length; 4852 return (NULL); 4853 } 4854 } 4855 break; 4856 case SCTP_SHUTDOWN_ACK: 4857 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4858 if ((stcb) && (netp) && (*netp)) 4859 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4860 *offset = length; 4861 return (NULL); 4862 break; 4863 4864 case SCTP_OPERATION_ERROR: 4865 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4866 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4867 4868 *offset = length; 4869 return (NULL); 4870 } 4871 break; 4872 case SCTP_COOKIE_ECHO: 4873 SCTPDBG(SCTP_DEBUG_INPUT3, 4874 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4875 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4876 ; 4877 } else { 4878 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4879 /* We are not interested anymore */ 4880 *offset = length; 4881 return (NULL); 4882 } 4883 } 4884 /* 4885 * First are we accepting? We do this again here 4886 * sincen it is possible that a previous endpoint 4887 * WAS listening responded to a INIT-ACK and then 4888 * closed. We opened and bound.. and are now no 4889 * longer listening. 4890 */ 4891 4892 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4893 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4894 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4895 struct mbuf *oper; 4896 struct sctp_paramhdr *phdr; 4897 4898 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4899 0, M_DONTWAIT, 1, MT_DATA); 4900 if (oper) { 4901 SCTP_BUF_LEN(oper) = 4902 sizeof(struct sctp_paramhdr); 4903 phdr = mtod(oper, 4904 struct sctp_paramhdr *); 4905 phdr->param_type = 4906 htons(SCTP_CAUSE_OUT_OF_RESC); 4907 phdr->param_length = 4908 htons(sizeof(struct sctp_paramhdr)); 4909 } 4910 sctp_abort_association(inp, stcb, m, 4911 iphlen, sh, oper, vrf_id, port); 4912 } 4913 *offset = length; 4914 return (NULL); 4915 } else { 4916 struct mbuf *ret_buf; 4917 struct sctp_inpcb *linp; 4918 4919 if (stcb) { 4920 linp = NULL; 4921 } else { 4922 linp = inp; 4923 } 4924 4925 if (linp) { 4926 SCTP_ASOC_CREATE_LOCK(linp); 4927 } 4928 if (netp) { 4929 ret_buf = 4930 sctp_handle_cookie_echo(m, iphlen, 4931 *offset, sh, 4932 (struct sctp_cookie_echo_chunk *)ch, 4933 &inp, &stcb, netp, 4934 auth_skipped, 4935 auth_offset, 4936 auth_len, 4937 &locked_tcb, 4938 vrf_id, 4939 port); 4940 } else { 4941 ret_buf = NULL; 4942 } 4943 if (linp) { 4944 SCTP_ASOC_CREATE_UNLOCK(linp); 4945 } 4946 if (ret_buf == NULL) { 4947 if (locked_tcb) { 4948 SCTP_TCB_UNLOCK(locked_tcb); 4949 } 4950 SCTPDBG(SCTP_DEBUG_INPUT3, 4951 "GAK, null buffer\n"); 4952 auth_skipped = 0; 4953 *offset = length; 4954 return (NULL); 4955 } 4956 /* if AUTH skipped, see if it verified... */ 4957 if (auth_skipped) { 4958 got_auth = 1; 4959 auth_skipped = 0; 4960 } 4961 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4962 /* 4963 * Restart the timer if we have 4964 * pending data 4965 */ 4966 struct sctp_tmit_chunk *chk; 4967 4968 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4969 if (chk) { 4970 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4971 stcb->sctp_ep, stcb, 4972 chk->whoTo); 4973 } 4974 } 4975 } 4976 break; 4977 case SCTP_COOKIE_ACK: 4978 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4979 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4980 if (locked_tcb) { 4981 SCTP_TCB_UNLOCK(locked_tcb); 4982 } 4983 return (NULL); 4984 } 4985 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4986 /* We are not interested anymore */ 4987 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4988 ; 4989 } else if (stcb) { 4990 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4991 so = SCTP_INP_SO(inp); 4992 atomic_add_int(&stcb->asoc.refcnt, 1); 4993 SCTP_TCB_UNLOCK(stcb); 4994 SCTP_SOCKET_LOCK(so, 1); 4995 SCTP_TCB_LOCK(stcb); 4996 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4997 #endif 4998 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4999 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5000 SCTP_SOCKET_UNLOCK(so, 1); 5001 #endif 5002 *offset = length; 5003 return (NULL); 5004 } 5005 } 5006 /* He's alive so give him credit */ 5007 if ((stcb) && netp && *netp) { 5008 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5009 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5010 stcb->asoc.overall_error_count, 5011 0, 5012 SCTP_FROM_SCTP_INPUT, 5013 __LINE__); 5014 } 5015 stcb->asoc.overall_error_count = 0; 5016 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5017 } 5018 break; 5019 case SCTP_ECN_ECHO: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5021 /* He's alive so give him credit */ 5022 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5023 /* Its not ours */ 5024 if (locked_tcb) { 5025 SCTP_TCB_UNLOCK(locked_tcb); 5026 } 5027 *offset = length; 5028 return (NULL); 5029 } 5030 if (stcb) { 5031 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5032 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5033 stcb->asoc.overall_error_count, 5034 0, 5035 SCTP_FROM_SCTP_INPUT, 5036 __LINE__); 5037 } 5038 stcb->asoc.overall_error_count = 0; 5039 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5040 stcb); 5041 } 5042 break; 5043 case SCTP_ECN_CWR: 5044 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5045 /* He's alive so give him credit */ 5046 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5047 /* Its not ours */ 5048 if (locked_tcb) { 5049 SCTP_TCB_UNLOCK(locked_tcb); 5050 } 5051 *offset = length; 5052 return (NULL); 5053 } 5054 if (stcb) { 5055 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5056 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5057 stcb->asoc.overall_error_count, 5058 0, 5059 SCTP_FROM_SCTP_INPUT, 5060 __LINE__); 5061 } 5062 stcb->asoc.overall_error_count = 0; 5063 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5064 } 5065 break; 5066 case SCTP_SHUTDOWN_COMPLETE: 5067 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5068 /* must be first and only chunk */ 5069 if ((num_chunks > 1) || 5070 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5071 *offset = length; 5072 if (locked_tcb) { 5073 SCTP_TCB_UNLOCK(locked_tcb); 5074 } 5075 return (NULL); 5076 } 5077 if ((stcb) && netp && *netp) { 5078 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5079 stcb, *netp); 5080 } 5081 *offset = length; 5082 return (NULL); 5083 break; 5084 case SCTP_ASCONF: 5085 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5086 /* He's alive so give him credit */ 5087 if (stcb) { 5088 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5089 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5090 stcb->asoc.overall_error_count, 5091 0, 5092 SCTP_FROM_SCTP_INPUT, 5093 __LINE__); 5094 } 5095 stcb->asoc.overall_error_count = 0; 5096 sctp_handle_asconf(m, *offset, 5097 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5098 asconf_cnt++; 5099 } 5100 break; 5101 case SCTP_ASCONF_ACK: 5102 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5103 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5104 /* Its not ours */ 5105 if (locked_tcb) { 5106 SCTP_TCB_UNLOCK(locked_tcb); 5107 } 5108 *offset = length; 5109 return (NULL); 5110 } 5111 if ((stcb) && netp && *netp) { 5112 /* He's alive so give him credit */ 5113 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5114 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5115 stcb->asoc.overall_error_count, 5116 0, 5117 SCTP_FROM_SCTP_INPUT, 5118 __LINE__); 5119 } 5120 stcb->asoc.overall_error_count = 0; 5121 sctp_handle_asconf_ack(m, *offset, 5122 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5123 if (abort_no_unlock) 5124 return (NULL); 5125 } 5126 break; 5127 case SCTP_FORWARD_CUM_TSN: 5128 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5129 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5130 /* Its not ours */ 5131 if (locked_tcb) { 5132 SCTP_TCB_UNLOCK(locked_tcb); 5133 } 5134 *offset = length; 5135 return (NULL); 5136 } 5137 /* He's alive so give him credit */ 5138 if (stcb) { 5139 int abort_flag = 0; 5140 5141 stcb->asoc.overall_error_count = 0; 5142 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5143 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5144 stcb->asoc.overall_error_count, 5145 0, 5146 SCTP_FROM_SCTP_INPUT, 5147 __LINE__); 5148 } 5149 *fwd_tsn_seen = 1; 5150 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5151 /* We are not interested anymore */ 5152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5153 so = SCTP_INP_SO(inp); 5154 atomic_add_int(&stcb->asoc.refcnt, 1); 5155 SCTP_TCB_UNLOCK(stcb); 5156 SCTP_SOCKET_LOCK(so, 1); 5157 SCTP_TCB_LOCK(stcb); 5158 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5159 #endif 5160 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5161 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5162 SCTP_SOCKET_UNLOCK(so, 1); 5163 #endif 5164 *offset = length; 5165 return (NULL); 5166 } 5167 sctp_handle_forward_tsn(stcb, 5168 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5169 if (abort_flag) { 5170 *offset = length; 5171 return (NULL); 5172 } else { 5173 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5174 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5175 stcb->asoc.overall_error_count, 5176 0, 5177 SCTP_FROM_SCTP_INPUT, 5178 __LINE__); 5179 } 5180 stcb->asoc.overall_error_count = 0; 5181 } 5182 5183 } 5184 break; 5185 case SCTP_STREAM_RESET: 5186 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5187 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5188 /* Its not ours */ 5189 if (locked_tcb) { 5190 SCTP_TCB_UNLOCK(locked_tcb); 5191 } 5192 *offset = length; 5193 return (NULL); 5194 } 5195 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5196 /* We are not interested anymore */ 5197 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5198 so = SCTP_INP_SO(inp); 5199 atomic_add_int(&stcb->asoc.refcnt, 1); 5200 SCTP_TCB_UNLOCK(stcb); 5201 SCTP_SOCKET_LOCK(so, 1); 5202 SCTP_TCB_LOCK(stcb); 5203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5204 #endif 5205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5207 SCTP_SOCKET_UNLOCK(so, 1); 5208 #endif 5209 *offset = length; 5210 return (NULL); 5211 } 5212 if (stcb->asoc.peer_supports_strreset == 0) { 5213 /* 5214 * hmm, peer should have announced this, but 5215 * we will turn it on since he is sending us 5216 * a stream reset. 5217 */ 5218 stcb->asoc.peer_supports_strreset = 1; 5219 } 5220 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5221 /* stop processing */ 5222 *offset = length; 5223 return (NULL); 5224 } 5225 break; 5226 case SCTP_PACKET_DROPPED: 5227 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5228 /* re-get it all please */ 5229 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5230 /* Its not ours */ 5231 if (locked_tcb) { 5232 SCTP_TCB_UNLOCK(locked_tcb); 5233 } 5234 *offset = length; 5235 return (NULL); 5236 } 5237 if (ch && (stcb) && netp && (*netp)) { 5238 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5239 stcb, *netp, 5240 min(chk_length, (sizeof(chunk_buf) - 4))); 5241 5242 } 5243 break; 5244 5245 case SCTP_AUTHENTICATION: 5246 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5247 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5248 goto unknown_chunk; 5249 5250 if (stcb == NULL) { 5251 /* save the first AUTH for later processing */ 5252 if (auth_skipped == 0) { 5253 auth_offset = *offset; 5254 auth_len = chk_length; 5255 auth_skipped = 1; 5256 } 5257 /* skip this chunk (temporarily) */ 5258 goto next_chunk; 5259 } 5260 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5261 (chk_length > (sizeof(struct sctp_auth_chunk) + 5262 SCTP_AUTH_DIGEST_LEN_MAX))) { 5263 /* Its not ours */ 5264 if (locked_tcb) { 5265 SCTP_TCB_UNLOCK(locked_tcb); 5266 } 5267 *offset = length; 5268 return (NULL); 5269 } 5270 if (got_auth == 1) { 5271 /* skip this chunk... it's already auth'd */ 5272 goto next_chunk; 5273 } 5274 got_auth = 1; 5275 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5276 m, *offset)) { 5277 /* auth HMAC failed so dump the packet */ 5278 *offset = length; 5279 return (stcb); 5280 } else { 5281 /* remaining chunks are HMAC checked */ 5282 stcb->asoc.authenticated = 1; 5283 } 5284 break; 5285 5286 default: 5287 unknown_chunk: 5288 /* it's an unknown chunk! */ 5289 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5290 struct mbuf *mm; 5291 struct sctp_paramhdr *phd; 5292 5293 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5294 0, M_DONTWAIT, 1, MT_DATA); 5295 if (mm) { 5296 phd = mtod(mm, struct sctp_paramhdr *); 5297 /* 5298 * We cheat and use param type since 5299 * we did not bother to define a 5300 * error cause struct. They are the 5301 * same basic format with different 5302 * names. 5303 */ 5304 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5305 phd->param_length = htons(chk_length + sizeof(*phd)); 5306 SCTP_BUF_LEN(mm) = sizeof(*phd); 5307 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5308 M_DONTWAIT); 5309 if (SCTP_BUF_NEXT(mm)) { 5310 #ifdef SCTP_MBUF_LOGGING 5311 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5312 struct mbuf *mat; 5313 5314 mat = SCTP_BUF_NEXT(mm); 5315 while (mat) { 5316 if (SCTP_BUF_IS_EXTENDED(mat)) { 5317 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5318 } 5319 mat = SCTP_BUF_NEXT(mat); 5320 } 5321 } 5322 #endif 5323 sctp_queue_op_err(stcb, mm); 5324 } else { 5325 sctp_m_freem(mm); 5326 } 5327 } 5328 } 5329 if ((ch->chunk_type & 0x80) == 0) { 5330 /* discard this packet */ 5331 *offset = length; 5332 return (stcb); 5333 } /* else skip this bad chunk and continue... */ 5334 break; 5335 } /* switch (ch->chunk_type) */ 5336 5337 5338 next_chunk: 5339 /* get the next chunk */ 5340 *offset += SCTP_SIZE32(chk_length); 5341 if (*offset >= length) { 5342 /* no more data left in the mbuf chain */ 5343 break; 5344 } 5345 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5346 sizeof(struct sctp_chunkhdr), chunk_buf); 5347 if (ch == NULL) { 5348 if (locked_tcb) { 5349 SCTP_TCB_UNLOCK(locked_tcb); 5350 } 5351 *offset = length; 5352 return (NULL); 5353 } 5354 } /* while */ 5355 5356 if (asconf_cnt > 0 && stcb != NULL) { 5357 sctp_send_asconf_ack(stcb); 5358 } 5359 return (stcb); 5360 } 5361 5362 5363 /* 5364 * Process the ECN bits we have something set so we must look to see if it is 5365 * ECN(0) or ECN(1) or CE 5366 */ 5367 static void 5368 sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5369 uint8_t ecn_bits) 5370 { 5371 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5372 ; 5373 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5374 /* 5375 * we only add to the nonce sum for ECT1, ECT0 does not 5376 * change the NS bit (that we have yet to find a way to send 5377 * it yet). 5378 */ 5379 5380 /* ECN Nonce stuff */ 5381 stcb->asoc.receiver_nonce_sum++; 5382 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5383 5384 /* 5385 * Drag up the last_echo point if cumack is larger since we 5386 * don't want the point falling way behind by more than 5387 * 2^^31 and then having it be incorrect. 5388 */ 5389 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5390 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5391 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5392 } 5393 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5394 /* 5395 * Drag up the last_echo point if cumack is larger since we 5396 * don't want the point falling way behind by more than 5397 * 2^^31 and then having it be incorrect. 5398 */ 5399 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5400 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5401 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5402 } 5403 } 5404 } 5405 5406 static void 5407 sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5408 uint32_t high_tsn, uint8_t ecn_bits) 5409 { 5410 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5411 /* 5412 * we possibly must notify the sender that a congestion 5413 * window reduction is in order. We do this by adding a ECNE 5414 * chunk to the output chunk queue. The incoming CWR will 5415 * remove this chunk. 5416 */ 5417 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5418 MAX_TSN)) { 5419 /* Yep, we need to add a ECNE */ 5420 sctp_send_ecn_echo(stcb, net, high_tsn); 5421 stcb->asoc.last_echo_tsn = high_tsn; 5422 } 5423 } 5424 } 5425 5426 #ifdef INVARIANTS 5427 static void 5428 sctp_validate_no_locks(struct sctp_inpcb *inp) 5429 { 5430 struct sctp_tcb *stcb; 5431 5432 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 5433 if (mtx_owned(&stcb->tcb_mtx)) { 5434 panic("Own lock on stcb at return from input"); 5435 } 5436 } 5437 } 5438 5439 #endif 5440 5441 /* 5442 * common input chunk processing (v4 and v6) 5443 */ 5444 void 5445 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5446 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5447 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5448 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5449 { 5450 /* 5451 * Control chunk processing 5452 */ 5453 uint32_t high_tsn; 5454 int fwd_tsn_seen = 0, data_processed = 0; 5455 struct mbuf *m = *mm; 5456 int abort_flag = 0; 5457 int un_sent; 5458 5459 SCTP_STAT_INCR(sctps_recvdatagrams); 5460 #ifdef SCTP_AUDITING_ENABLED 5461 sctp_audit_log(0xE0, 1); 5462 sctp_auditing(0, inp, stcb, net); 5463 #endif 5464 5465 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5466 m, iphlen, offset, length, stcb); 5467 if (stcb) { 5468 /* always clear this before beginning a packet */ 5469 stcb->asoc.authenticated = 0; 5470 stcb->asoc.seen_a_sack_this_pkt = 0; 5471 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5472 stcb, stcb->asoc.state); 5473 5474 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5475 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5476 /*- 5477 * If we hit here, we had a ref count 5478 * up when the assoc was aborted and the 5479 * timer is clearing out the assoc, we should 5480 * NOT respond to any packet.. its OOTB. 5481 */ 5482 SCTP_TCB_UNLOCK(stcb); 5483 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5484 vrf_id, port); 5485 goto out_now; 5486 } 5487 } 5488 if (IS_SCTP_CONTROL(ch)) { 5489 /* process the control portion of the SCTP packet */ 5490 /* sa_ignore NO_NULL_CHK */ 5491 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5492 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5493 if (stcb) { 5494 /* 5495 * This covers us if the cookie-echo was there and 5496 * it changes our INP. 5497 */ 5498 inp = stcb->sctp_ep; 5499 if ((net) && (port)) { 5500 if (net->port == 0) { 5501 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5502 } 5503 net->port = port; 5504 } 5505 } 5506 } else { 5507 /* 5508 * no control chunks, so pre-process DATA chunks (these 5509 * checks are taken care of by control processing) 5510 */ 5511 5512 /* 5513 * if DATA only packet, and auth is required, then punt... 5514 * can't have authenticated without any AUTH (control) 5515 * chunks 5516 */ 5517 if ((stcb != NULL) && 5518 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5519 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5520 /* "silently" ignore */ 5521 SCTP_STAT_INCR(sctps_recvauthmissing); 5522 SCTP_TCB_UNLOCK(stcb); 5523 goto out_now; 5524 } 5525 if (stcb == NULL) { 5526 /* out of the blue DATA chunk */ 5527 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5528 vrf_id, port); 5529 goto out_now; 5530 } 5531 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5532 /* v_tag mismatch! */ 5533 SCTP_STAT_INCR(sctps_badvtag); 5534 SCTP_TCB_UNLOCK(stcb); 5535 goto out_now; 5536 } 5537 } 5538 5539 if (stcb == NULL) { 5540 /* 5541 * no valid TCB for this packet, or we found it's a bad 5542 * packet while processing control, or we're done with this 5543 * packet (done or skip rest of data), so we drop it... 5544 */ 5545 goto out_now; 5546 } 5547 /* 5548 * DATA chunk processing 5549 */ 5550 /* plow through the data chunks while length > offset */ 5551 5552 /* 5553 * Rest should be DATA only. Check authentication state if AUTH for 5554 * DATA is required. 5555 */ 5556 if ((length > offset) && 5557 (stcb != NULL) && 5558 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5559 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5560 !stcb->asoc.authenticated) { 5561 /* "silently" ignore */ 5562 SCTP_STAT_INCR(sctps_recvauthmissing); 5563 SCTPDBG(SCTP_DEBUG_AUTH1, 5564 "Data chunk requires AUTH, skipped\n"); 5565 goto trigger_send; 5566 } 5567 if (length > offset) { 5568 int retval; 5569 5570 /* 5571 * First check to make sure our state is correct. We would 5572 * not get here unless we really did have a tag, so we don't 5573 * abort if this happens, just dump the chunk silently. 5574 */ 5575 switch (SCTP_GET_STATE(&stcb->asoc)) { 5576 case SCTP_STATE_COOKIE_ECHOED: 5577 /* 5578 * we consider data with valid tags in this state 5579 * shows us the cookie-ack was lost. Imply it was 5580 * there. 5581 */ 5582 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5583 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5584 stcb->asoc.overall_error_count, 5585 0, 5586 SCTP_FROM_SCTP_INPUT, 5587 __LINE__); 5588 } 5589 stcb->asoc.overall_error_count = 0; 5590 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5591 break; 5592 case SCTP_STATE_COOKIE_WAIT: 5593 /* 5594 * We consider OOTB any data sent during asoc setup. 5595 */ 5596 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5597 vrf_id, port); 5598 SCTP_TCB_UNLOCK(stcb); 5599 goto out_now; 5600 /* sa_ignore NOTREACHED */ 5601 break; 5602 case SCTP_STATE_EMPTY: /* should not happen */ 5603 case SCTP_STATE_INUSE: /* should not happen */ 5604 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5605 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5606 default: 5607 SCTP_TCB_UNLOCK(stcb); 5608 goto out_now; 5609 /* sa_ignore NOTREACHED */ 5610 break; 5611 case SCTP_STATE_OPEN: 5612 case SCTP_STATE_SHUTDOWN_SENT: 5613 break; 5614 } 5615 /* take care of ECN, part 1. */ 5616 if (stcb->asoc.ecn_allowed && 5617 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5618 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5619 } 5620 /* plow through the data chunks while length > offset */ 5621 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5622 inp, stcb, net, &high_tsn); 5623 if (retval == 2) { 5624 /* 5625 * The association aborted, NO UNLOCK needed since 5626 * the association is destroyed. 5627 */ 5628 goto out_now; 5629 } 5630 data_processed = 1; 5631 if (retval == 0) { 5632 /* take care of ecn part 2. */ 5633 if (stcb->asoc.ecn_allowed && 5634 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5635 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5636 ecn_bits); 5637 } 5638 } 5639 /* 5640 * Anything important needs to have been m_copy'ed in 5641 * process_data 5642 */ 5643 } 5644 if ((data_processed == 0) && (fwd_tsn_seen)) { 5645 int was_a_gap = 0; 5646 5647 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5648 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5649 /* there was a gap before this data was processed */ 5650 was_a_gap = 1; 5651 } 5652 stcb->asoc.send_sack = 1; 5653 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 5654 if (abort_flag) { 5655 /* Again, we aborted so NO UNLOCK needed */ 5656 goto out_now; 5657 } 5658 } else if (fwd_tsn_seen) { 5659 stcb->asoc.send_sack = 1; 5660 } 5661 /* trigger send of any chunks in queue... */ 5662 trigger_send: 5663 #ifdef SCTP_AUDITING_ENABLED 5664 sctp_audit_log(0xE0, 2); 5665 sctp_auditing(1, inp, stcb, net); 5666 #endif 5667 SCTPDBG(SCTP_DEBUG_INPUT1, 5668 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5669 stcb->asoc.peers_rwnd, 5670 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5671 stcb->asoc.total_flight); 5672 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5673 5674 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5675 ((un_sent) && 5676 (stcb->asoc.peers_rwnd > 0 || 5677 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5678 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5679 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5680 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5681 } 5682 #ifdef SCTP_AUDITING_ENABLED 5683 sctp_audit_log(0xE0, 3); 5684 sctp_auditing(2, inp, stcb, net); 5685 #endif 5686 SCTP_TCB_UNLOCK(stcb); 5687 out_now: 5688 #ifdef INVARIANTS 5689 sctp_validate_no_locks(inp); 5690 #endif 5691 return; 5692 } 5693 5694 #if 0 5695 static void 5696 sctp_print_mbuf_chain(struct mbuf *m) 5697 { 5698 for (; m; m = SCTP_BUF_NEXT(m)) { 5699 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5700 if (SCTP_BUF_IS_EXTENDED(m)) 5701 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5702 } 5703 } 5704 5705 #endif 5706 5707 void 5708 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5709 { 5710 #ifdef SCTP_MBUF_LOGGING 5711 struct mbuf *mat; 5712 5713 #endif 5714 struct mbuf *m; 5715 int iphlen; 5716 uint32_t vrf_id = 0; 5717 uint8_t ecn_bits; 5718 struct ip *ip; 5719 struct sctphdr *sh; 5720 struct sctp_inpcb *inp = NULL; 5721 5722 uint32_t check, calc_check; 5723 struct sctp_nets *net; 5724 struct sctp_tcb *stcb = NULL; 5725 struct sctp_chunkhdr *ch; 5726 int refcount_up = 0; 5727 int length, mlen, offset; 5728 5729 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5730 SCTP_RELEASE_PKT(i_pak); 5731 return; 5732 } 5733 mlen = SCTP_HEADER_LEN(i_pak); 5734 iphlen = off; 5735 m = SCTP_HEADER_TO_CHAIN(i_pak); 5736 5737 net = NULL; 5738 SCTP_STAT_INCR(sctps_recvpackets); 5739 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5740 5741 5742 #ifdef SCTP_MBUF_LOGGING 5743 /* Log in any input mbufs */ 5744 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5745 mat = m; 5746 while (mat) { 5747 if (SCTP_BUF_IS_EXTENDED(mat)) { 5748 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5749 } 5750 mat = SCTP_BUF_NEXT(mat); 5751 } 5752 } 5753 #endif 5754 #ifdef SCTP_PACKET_LOGGING 5755 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5756 sctp_packet_log(m, mlen); 5757 #endif 5758 /* 5759 * Must take out the iphlen, since mlen expects this (only effect lb 5760 * case) 5761 */ 5762 mlen -= iphlen; 5763 5764 /* 5765 * Get IP, SCTP, and first chunk header together in first mbuf. 5766 */ 5767 ip = mtod(m, struct ip *); 5768 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5769 if (SCTP_BUF_LEN(m) < offset) { 5770 if ((m = m_pullup(m, offset)) == 0) { 5771 SCTP_STAT_INCR(sctps_hdrops); 5772 return; 5773 } 5774 ip = mtod(m, struct ip *); 5775 } 5776 /* validate mbuf chain length with IP payload length */ 5777 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5778 SCTP_STAT_INCR(sctps_hdrops); 5779 goto bad; 5780 } 5781 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5782 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5783 SCTPDBG(SCTP_DEBUG_INPUT1, 5784 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5785 5786 /* SCTP does not allow broadcasts or multicasts */ 5787 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5788 goto bad; 5789 } 5790 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5791 /* 5792 * We only look at broadcast if its a front state, All 5793 * others we will not have a tcb for anyway. 5794 */ 5795 goto bad; 5796 } 5797 /* validate SCTP checksum */ 5798 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5799 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5800 m->m_pkthdr.len, 5801 if_name(m->m_pkthdr.rcvif), 5802 m->m_pkthdr.csum_flags); 5803 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5804 SCTP_STAT_INCR(sctps_recvhwcrc); 5805 goto sctp_skip_csum_4; 5806 } 5807 check = sh->checksum; /* save incoming checksum */ 5808 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5809 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5810 (SCTP_IS_IT_LOOPBACK(m))) 5811 ) { 5812 SCTP_STAT_INCR(sctps_recvnocrc); 5813 goto sctp_skip_csum_4; 5814 } 5815 sh->checksum = 0; /* prepare for calc */ 5816 calc_check = sctp_calculate_cksum(m, iphlen); 5817 sh->checksum = check; 5818 SCTP_STAT_INCR(sctps_recvswcrc); 5819 if (calc_check != check) { 5820 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5821 calc_check, check, m, mlen, iphlen); 5822 5823 stcb = sctp_findassociation_addr(m, iphlen, 5824 offset - sizeof(*ch), 5825 sh, ch, &inp, &net, 5826 vrf_id); 5827 if ((net) && (port)) { 5828 if (net->port == 0) { 5829 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5830 } 5831 net->port = port; 5832 } 5833 if ((inp) && (stcb)) { 5834 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5835 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5836 } else if ((inp != NULL) && (stcb == NULL)) { 5837 refcount_up = 1; 5838 } 5839 SCTP_STAT_INCR(sctps_badsum); 5840 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5841 goto bad; 5842 } 5843 sctp_skip_csum_4: 5844 /* destination port of 0 is illegal, based on RFC2960. */ 5845 if (sh->dest_port == 0) { 5846 SCTP_STAT_INCR(sctps_hdrops); 5847 goto bad; 5848 } 5849 /* 5850 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5851 * IP/SCTP/first chunk header... 5852 */ 5853 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5854 sh, ch, &inp, &net, vrf_id); 5855 if ((net) && (port)) { 5856 if (net->port == 0) { 5857 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5858 } 5859 net->port = port; 5860 } 5861 /* inp's ref-count increased && stcb locked */ 5862 if (inp == NULL) { 5863 struct sctp_init_chunk *init_chk, chunk_buf; 5864 5865 SCTP_STAT_INCR(sctps_noport); 5866 #ifdef ICMP_BANDLIM 5867 /* 5868 * we use the bandwidth limiting to protect against sending 5869 * too many ABORTS all at once. In this case these count the 5870 * same as an ICMP message. 5871 */ 5872 if (badport_bandlim(0) < 0) 5873 goto bad; 5874 #endif /* ICMP_BANDLIM */ 5875 SCTPDBG(SCTP_DEBUG_INPUT1, 5876 "Sending a ABORT from packet entry!\n"); 5877 if (ch->chunk_type == SCTP_INITIATION) { 5878 /* 5879 * we do a trick here to get the INIT tag, dig in 5880 * and get the tag from the INIT and put it in the 5881 * common header. 5882 */ 5883 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5884 iphlen + sizeof(*sh), sizeof(*init_chk), 5885 (uint8_t *) & chunk_buf); 5886 if (init_chk != NULL) 5887 sh->v_tag = init_chk->init.initiate_tag; 5888 } 5889 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5890 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5891 goto bad; 5892 } 5893 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5894 goto bad; 5895 } 5896 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5897 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5898 goto bad; 5899 } else if (stcb == NULL) { 5900 refcount_up = 1; 5901 } 5902 #ifdef IPSEC 5903 /* 5904 * I very much doubt any of the IPSEC stuff will work but I have no 5905 * idea, so I will leave it in place. 5906 */ 5907 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5908 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5909 SCTP_STAT_INCR(sctps_hdrops); 5910 goto bad; 5911 } 5912 #endif /* IPSEC */ 5913 5914 /* 5915 * common chunk processing 5916 */ 5917 length = ip->ip_len + iphlen; 5918 offset -= sizeof(struct sctp_chunkhdr); 5919 5920 ecn_bits = ip->ip_tos; 5921 5922 /* sa_ignore NO_NULL_CHK */ 5923 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5924 inp, stcb, net, ecn_bits, vrf_id, port); 5925 /* inp's ref-count reduced && stcb unlocked */ 5926 if (m) { 5927 sctp_m_freem(m); 5928 } 5929 if ((inp) && (refcount_up)) { 5930 /* reduce ref-count */ 5931 SCTP_INP_DECR_REF(inp); 5932 } 5933 return; 5934 bad: 5935 if (stcb) { 5936 SCTP_TCB_UNLOCK(stcb); 5937 } 5938 if ((inp) && (refcount_up)) { 5939 /* reduce ref-count */ 5940 SCTP_INP_DECR_REF(inp); 5941 } 5942 if (m) { 5943 sctp_m_freem(m); 5944 } 5945 return; 5946 } 5947 void 5948 sctp_input(i_pak, off) 5949 struct mbuf *i_pak; 5950 int off; 5951 { 5952 sctp_input_with_port(i_pak, off, 0); 5953 } 5954