1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/udp.h> 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88 { 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 uint32_t init_limit; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 98 goto outnow; 99 } 100 } 101 op_err = NULL; 102 init = &cp->init; 103 /* First are we accepting? */ 104 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 105 SCTPDBG(SCTP_DEBUG_INPUT2, 106 "sctp_handle_init: Abort, so_qlimit:%d\n", 107 inp->sctp_socket->so_qlimit); 108 /* 109 * FIX ME ?? What about TCP model and we have a 110 * match/restart case? Actually no fix is needed. the lookup 111 * will always find the existing assoc so stcb would not be 112 * NULL. It may be questionable to do this since we COULD 113 * just send back the INIT-ACK and hope that the app did 114 * accept()'s by the time the COOKIE was sent. But there is 115 * a price to pay for COOKIE generation and I don't want to 116 * pay it on the chance that the app will actually do some 117 * accepts(). The App just looses and should NOT be in this 118 * state :-) 119 */ 120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 121 vrf_id, port); 122 if (stcb) 123 *abort_no_unlock = 1; 124 goto outnow; 125 } 126 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 127 /* Invalid length */ 128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 /* validate parameters */ 136 if (init->initiate_tag == 0) { 137 /* protocol error... send abort */ 138 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 139 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 146 /* invalid parameter... send abort */ 147 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 148 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 149 vrf_id, port); 150 if (stcb) 151 *abort_no_unlock = 1; 152 goto outnow; 153 } 154 if (init->num_inbound_streams == 0) { 155 /* protocol error... send abort */ 156 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 157 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 158 vrf_id, port); 159 if (stcb) 160 *abort_no_unlock = 1; 161 goto outnow; 162 } 163 if (init->num_outbound_streams == 0) { 164 /* protocol error... send abort */ 165 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 166 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 167 vrf_id, port); 168 if (stcb) 169 *abort_no_unlock = 1; 170 goto outnow; 171 } 172 init_limit = offset + ntohs(cp->ch.chunk_length); 173 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 174 init_limit)) { 175 /* auth parameter(s) error... send abort */ 176 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 177 if (stcb) 178 *abort_no_unlock = 1; 179 goto outnow; 180 } 181 /* send an INIT-ACK w/cookie */ 182 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 183 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 184 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 185 outnow: 186 if (stcb == NULL) { 187 SCTP_INP_RUNLOCK(inp); 188 } 189 } 190 191 /* 192 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 193 */ 194 195 int 196 sctp_is_there_unsent_data(struct sctp_tcb *stcb) 197 { 198 int unsent_data = 0; 199 unsigned int i; 200 struct sctp_stream_queue_pending *sp; 201 struct sctp_association *asoc; 202 203 /* 204 * This function returns the number of streams that have true unsent 205 * data on them. Note that as it looks through it will clean up any 206 * places that have old data that has been sent but left at top of 207 * stream queue. 208 */ 209 asoc = &stcb->asoc; 210 SCTP_TCB_SEND_LOCK(stcb); 211 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 212 /* Check to see if some data queued */ 213 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 214 /* sa_ignore FREED_MEMORY */ 215 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 216 if (sp == NULL) { 217 continue; 218 } 219 if ((sp->msg_is_complete) && 220 (sp->length == 0) && 221 (sp->sender_all_done)) { 222 /* 223 * We are doing differed cleanup. Last time 224 * through when we took all the data the 225 * sender_all_done was not set. 226 */ 227 if (sp->put_last_out == 0) { 228 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 229 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 230 sp->sender_all_done, 231 sp->length, 232 sp->msg_is_complete, 233 sp->put_last_out); 234 } 235 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 236 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 237 if (sp->net) { 238 sctp_free_remote_addr(sp->net); 239 sp->net = NULL; 240 } 241 if (sp->data) { 242 sctp_m_freem(sp->data); 243 sp->data = NULL; 244 } 245 sctp_free_a_strmoq(stcb, sp); 246 } else { 247 unsent_data++; 248 break; 249 } 250 } 251 } 252 SCTP_TCB_SEND_UNLOCK(stcb); 253 return (unsent_data); 254 } 255 256 static int 257 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 258 struct sctp_nets *net) 259 { 260 struct sctp_init *init; 261 struct sctp_association *asoc; 262 struct sctp_nets *lnet; 263 unsigned int i; 264 265 init = &cp->init; 266 asoc = &stcb->asoc; 267 /* save off parameters */ 268 asoc->peer_vtag = ntohl(init->initiate_tag); 269 asoc->peers_rwnd = ntohl(init->a_rwnd); 270 /* init tsn's */ 271 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 272 273 if (!TAILQ_EMPTY(&asoc->nets)) { 274 /* update any ssthresh's that may have a default */ 275 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 276 lnet->ssthresh = asoc->peers_rwnd; 277 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 278 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 279 } 280 } 281 } 282 SCTP_TCB_SEND_LOCK(stcb); 283 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 284 unsigned int newcnt; 285 struct sctp_stream_out *outs; 286 struct sctp_stream_queue_pending *sp, *nsp; 287 struct sctp_tmit_chunk *chk, *nchk; 288 289 /* abandon the upper streams */ 290 newcnt = ntohs(init->num_inbound_streams); 291 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 292 if (chk->rec.data.stream_number >= newcnt) { 293 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 294 asoc->send_queue_cnt--; 295 if (chk->data != NULL) { 296 sctp_free_bufspace(stcb, asoc, chk, 1); 297 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 298 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 299 if (chk->data) { 300 sctp_m_freem(chk->data); 301 chk->data = NULL; 302 } 303 } 304 sctp_free_a_chunk(stcb, chk); 305 /* sa_ignore FREED_MEMORY */ 306 } 307 } 308 if (asoc->strmout) { 309 for (i = newcnt; i < asoc->pre_open_streams; i++) { 310 outs = &asoc->strmout[i]; 311 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 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 if (sp->net) { 322 sctp_free_remote_addr(sp->net); 323 sp->net = NULL; 324 } 325 /* Free the chunk */ 326 sctp_free_a_strmoq(stcb, sp); 327 /* sa_ignore FREED_MEMORY */ 328 } 329 } 330 } 331 /* cut back the count */ 332 asoc->pre_open_streams = newcnt; 333 } 334 SCTP_TCB_SEND_UNLOCK(stcb); 335 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 336 337 /* 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 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 347 348 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 349 /* open the requested streams */ 350 351 if (asoc->strmin != NULL) { 352 /* Free the old ones */ 353 struct sctp_queued_to_read *ctl, *nctl; 354 355 for (i = 0; i < asoc->streamincnt; i++) { 356 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 357 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 358 sctp_free_remote_addr(ctl->whoFrom); 359 ctl->whoFrom = NULL; 360 sctp_m_freem(ctl->data); 361 ctl->data = NULL; 362 sctp_free_a_readq(stcb, ctl); 363 } 364 } 365 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 366 } 367 asoc->streamincnt = ntohs(init->num_outbound_streams); 368 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 369 asoc->streamincnt = MAX_SCTP_STREAMS; 370 } 371 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 372 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 373 if (asoc->strmin == NULL) { 374 /* we didn't get memory for the streams! */ 375 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 376 return (-1); 377 } 378 for (i = 0; i < asoc->streamincnt; i++) { 379 asoc->strmin[i].stream_no = i; 380 asoc->strmin[i].last_sequence_delivered = 0xffff; 381 /* 382 * U-stream ranges will be set when the cookie is unpacked. 383 * Or for the INIT sender they are un set (if pr-sctp not 384 * supported) when the INIT-ACK arrives. 385 */ 386 TAILQ_INIT(&asoc->strmin[i].inqueue); 387 asoc->strmin[i].delivery_started = 0; 388 } 389 /* 390 * load_address_from_init will put the addresses into the 391 * association when the COOKIE is processed or the INIT-ACK is 392 * processed. Both types of COOKIE's existing and new call this 393 * routine. It will remove addresses that are no longer in the 394 * association (for the restarting case where addresses are 395 * removed). Up front when the INIT arrives we will discard it if it 396 * is a restart and new addresses have been added. 397 */ 398 /* sa_ignore MEMLEAK */ 399 return (0); 400 } 401 402 /* 403 * INIT-ACK message processing/consumption returns value < 0 on error 404 */ 405 static int 406 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 407 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 408 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 409 { 410 struct sctp_association *asoc; 411 struct mbuf *op_err; 412 int retval, abort_flag; 413 uint32_t initack_limit; 414 int nat_friendly = 0; 415 416 /* First verify that we have no illegal param's */ 417 abort_flag = 0; 418 op_err = NULL; 419 420 op_err = sctp_arethere_unrecognized_parameters(m, 421 (offset + sizeof(struct sctp_init_chunk)), 422 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 423 if (abort_flag) { 424 /* Send an abort and notify peer */ 425 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 426 *abort_no_unlock = 1; 427 return (-1); 428 } 429 asoc = &stcb->asoc; 430 asoc->peer_supports_nat = (uint8_t) nat_friendly; 431 /* process the peer's parameters in the INIT-ACK */ 432 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 433 if (retval < 0) { 434 return (retval); 435 } 436 initack_limit = offset + ntohs(cp->ch.chunk_length); 437 /* load all addresses */ 438 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 439 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 440 NULL))) { 441 /* Huh, we should abort */ 442 SCTPDBG(SCTP_DEBUG_INPUT1, 443 "Load addresses from INIT causes an abort %d\n", 444 retval); 445 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 446 NULL, 0, net->port); 447 *abort_no_unlock = 1; 448 return (-1); 449 } 450 /* if the peer doesn't support asconf, flush the asconf queue */ 451 if (asoc->peer_supports_asconf == 0) { 452 struct sctp_asconf_addr *param, *nparam; 453 454 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 455 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 456 SCTP_FREE(param, SCTP_M_ASC_ADDR); 457 } 458 } 459 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 460 stcb->asoc.local_hmacs); 461 if (op_err) { 462 sctp_queue_op_err(stcb, op_err); 463 /* queuing will steal away the mbuf chain to the out queue */ 464 op_err = NULL; 465 } 466 /* extract the cookie and queue it to "echo" it back... */ 467 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 468 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 469 stcb->asoc.overall_error_count, 470 0, 471 SCTP_FROM_SCTP_INPUT, 472 __LINE__); 473 } 474 stcb->asoc.overall_error_count = 0; 475 net->error_count = 0; 476 477 /* 478 * Cancel the INIT timer, We do this first before queueing the 479 * cookie. We always cancel at the primary to assue that we are 480 * canceling the timer started by the INIT which always goes to the 481 * primary. 482 */ 483 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 484 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 485 486 /* calculate the RTO */ 487 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 488 SCTP_DETERMINE_LL_NOTOK); 489 490 retval = sctp_send_cookie_echo(m, offset, stcb, net); 491 if (retval < 0) { 492 /* 493 * No cookie, we probably should send a op error. But in any 494 * case if there is no cookie in the INIT-ACK, we can 495 * abandon the peer, its broke. 496 */ 497 if (retval == -3) { 498 /* We abort with an error of missing mandatory param */ 499 op_err = 500 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 501 if (op_err) { 502 /* 503 * Expand beyond to include the mandatory 504 * param cookie 505 */ 506 struct sctp_inv_mandatory_param *mp; 507 508 SCTP_BUF_LEN(op_err) = 509 sizeof(struct sctp_inv_mandatory_param); 510 mp = mtod(op_err, 511 struct sctp_inv_mandatory_param *); 512 /* Subtract the reserved param */ 513 mp->length = 514 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 515 mp->num_param = htonl(1); 516 mp->param = htons(SCTP_STATE_COOKIE); 517 mp->resv = 0; 518 } 519 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 520 sh, op_err, 0, net->port); 521 *abort_no_unlock = 1; 522 } 523 return (retval); 524 } 525 return (0); 526 } 527 528 static void 529 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 530 struct sctp_tcb *stcb, struct sctp_nets *net) 531 { 532 struct sockaddr_storage store; 533 struct sockaddr_in *sin; 534 struct sockaddr_in6 *sin6; 535 struct sctp_nets *r_net, *f_net; 536 struct timeval tv; 537 int req_prim = 0; 538 539 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 540 /* Invalid length */ 541 return; 542 } 543 sin = (struct sockaddr_in *)&store; 544 sin6 = (struct sockaddr_in6 *)&store; 545 546 memset(&store, 0, sizeof(store)); 547 if (cp->heartbeat.hb_info.addr_family == AF_INET && 548 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 549 sin->sin_family = cp->heartbeat.hb_info.addr_family; 550 sin->sin_len = cp->heartbeat.hb_info.addr_len; 551 sin->sin_port = stcb->rport; 552 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 553 sizeof(sin->sin_addr)); 554 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 555 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 556 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 557 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 558 sin6->sin6_port = stcb->rport; 559 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 560 sizeof(sin6->sin6_addr)); 561 } else { 562 return; 563 } 564 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 565 if (r_net == NULL) { 566 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 567 return; 568 } 569 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 570 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 571 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 572 /* 573 * If the its a HB and it's random value is correct when can 574 * confirm the destination. 575 */ 576 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 577 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 578 stcb->asoc.primary_destination = r_net; 579 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 580 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 581 f_net = TAILQ_FIRST(&stcb->asoc.nets); 582 if (f_net != r_net) { 583 /* 584 * first one on the list is NOT the primary 585 * sctp_cmpaddr() is much more efficent if 586 * the primary is the first on the list, 587 * make it so. 588 */ 589 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 590 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 591 } 592 req_prim = 1; 593 } 594 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 595 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 596 } 597 r_net->error_count = 0; 598 r_net->hb_responded = 1; 599 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 600 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 601 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 602 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 603 r_net->dest_state |= SCTP_ADDR_REACHABLE; 604 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 605 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 606 /* now was it the primary? if so restore */ 607 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 608 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 609 } 610 } 611 /* 612 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 613 * set the destination to active state and set the cwnd to one or 614 * two MTU's based on whether PF1 or PF2 is being used. If a T3 615 * timer is running, for the destination, stop the timer because a 616 * PF-heartbeat was received. 617 */ 618 if ((stcb->asoc.sctp_cmt_on_off > 0) && 619 (stcb->asoc.sctp_cmt_pf > 0) && 620 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 621 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 622 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 623 stcb, net, 624 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 625 } 626 net->dest_state &= ~SCTP_ADDR_PF; 627 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf; 628 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 629 net, net->cwnd); 630 } 631 /* Now lets do a RTO with this */ 632 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 633 SCTP_DETERMINE_LL_OK); 634 /* Mobility adaptation */ 635 if (req_prim) { 636 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 637 SCTP_MOBILITY_BASE) || 638 sctp_is_mobility_feature_on(stcb->sctp_ep, 639 SCTP_MOBILITY_FASTHANDOFF)) && 640 sctp_is_mobility_feature_on(stcb->sctp_ep, 641 SCTP_MOBILITY_PRIM_DELETED)) { 642 643 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 644 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 645 SCTP_MOBILITY_FASTHANDOFF)) { 646 sctp_assoc_immediate_retrans(stcb, 647 stcb->asoc.primary_destination); 648 } 649 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 650 SCTP_MOBILITY_BASE)) { 651 sctp_move_chunks_from_net(stcb, 652 stcb->asoc.deleted_primary); 653 } 654 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 655 stcb->asoc.deleted_primary); 656 } 657 } 658 } 659 660 static int 661 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 662 { 663 /* 664 * return 0 means we want you to proceed with the abort non-zero 665 * means no abort processing 666 */ 667 struct sctpasochead *head; 668 669 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 670 /* generate a new vtag and send init */ 671 LIST_REMOVE(stcb, sctp_asocs); 672 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 673 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 674 /* 675 * put it in the bucket in the vtag hash of assoc's for the 676 * system 677 */ 678 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 679 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 680 return (1); 681 } 682 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 683 /* 684 * treat like a case where the cookie expired i.e.: - dump 685 * current cookie. - generate a new vtag. - resend init. 686 */ 687 /* generate a new vtag and send init */ 688 LIST_REMOVE(stcb, sctp_asocs); 689 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 690 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 691 sctp_stop_all_cookie_timers(stcb); 692 sctp_toss_old_cookies(stcb, &stcb->asoc); 693 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 694 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 695 /* 696 * put it in the bucket in the vtag hash of assoc's for the 697 * system 698 */ 699 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 700 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 701 return (1); 702 } 703 return (0); 704 } 705 706 static int 707 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 708 struct sctp_nets *net) 709 { 710 /* 711 * return 0 means we want you to proceed with the abort non-zero 712 * means no abort processing 713 */ 714 if (stcb->asoc.peer_supports_auth == 0) { 715 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 716 return (0); 717 } 718 sctp_asconf_send_nat_state_update(stcb, net); 719 return (1); 720 } 721 722 723 static void 724 sctp_handle_abort(struct sctp_abort_chunk *cp, 725 struct sctp_tcb *stcb, struct sctp_nets *net) 726 { 727 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 728 struct socket *so; 729 730 #endif 731 uint16_t len; 732 733 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 734 if (stcb == NULL) 735 return; 736 737 len = ntohs(cp->ch.chunk_length); 738 if (len > sizeof(struct sctp_chunkhdr)) { 739 /* 740 * Need to check the cause codes for our two magic nat 741 * aborts which don't kill the assoc necessarily. 742 */ 743 struct sctp_abort_chunk *cpnext; 744 struct sctp_missing_nat_state *natc; 745 uint16_t cause; 746 747 cpnext = cp; 748 cpnext++; 749 natc = (struct sctp_missing_nat_state *)cpnext; 750 cause = ntohs(natc->cause); 751 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 752 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 753 cp->ch.chunk_flags); 754 if (sctp_handle_nat_colliding_state(stcb)) { 755 return; 756 } 757 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 758 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 759 cp->ch.chunk_flags); 760 if (sctp_handle_nat_missing_state(stcb, net)) { 761 return; 762 } 763 } 764 } 765 /* stop any receive timers */ 766 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 767 /* notify user of the abort and clean up... */ 768 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 769 /* free the tcb */ 770 #if defined(SCTP_PANIC_ON_ABORT) 771 printf("stcb:%p state:%d rport:%d net:%p\n", 772 stcb, stcb->asoc.state, stcb->rport, net); 773 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 774 panic("Received an ABORT"); 775 } else { 776 printf("No panic its in state %x closed\n", stcb->asoc.state); 777 } 778 #endif 779 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 780 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 781 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 782 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 783 } 784 #ifdef SCTP_ASOCLOG_OF_TSNS 785 sctp_print_out_track_log(stcb); 786 #endif 787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 788 so = SCTP_INP_SO(stcb->sctp_ep); 789 atomic_add_int(&stcb->asoc.refcnt, 1); 790 SCTP_TCB_UNLOCK(stcb); 791 SCTP_SOCKET_LOCK(so, 1); 792 SCTP_TCB_LOCK(stcb); 793 atomic_subtract_int(&stcb->asoc.refcnt, 1); 794 #endif 795 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 796 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 797 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 798 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 799 SCTP_SOCKET_UNLOCK(so, 1); 800 #endif 801 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 802 } 803 804 static void 805 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 806 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 807 { 808 struct sctp_association *asoc; 809 int some_on_streamwheel; 810 811 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 812 struct socket *so; 813 814 #endif 815 816 SCTPDBG(SCTP_DEBUG_INPUT2, 817 "sctp_handle_shutdown: handling SHUTDOWN\n"); 818 if (stcb == NULL) 819 return; 820 asoc = &stcb->asoc; 821 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 822 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 823 return; 824 } 825 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 826 /* Shutdown NOT the expected size */ 827 return; 828 } else { 829 sctp_update_acked(stcb, cp, net, abort_flag); 830 if (*abort_flag) { 831 return; 832 } 833 } 834 if (asoc->control_pdapi) { 835 /* 836 * With a normal shutdown we assume the end of last record. 837 */ 838 SCTP_INP_READ_LOCK(stcb->sctp_ep); 839 asoc->control_pdapi->end_added = 1; 840 asoc->control_pdapi->pdapi_aborted = 1; 841 asoc->control_pdapi = NULL; 842 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 843 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 844 so = SCTP_INP_SO(stcb->sctp_ep); 845 atomic_add_int(&stcb->asoc.refcnt, 1); 846 SCTP_TCB_UNLOCK(stcb); 847 SCTP_SOCKET_LOCK(so, 1); 848 SCTP_TCB_LOCK(stcb); 849 atomic_subtract_int(&stcb->asoc.refcnt, 1); 850 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 851 /* assoc was freed while we were unlocked */ 852 SCTP_SOCKET_UNLOCK(so, 1); 853 return; 854 } 855 #endif 856 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 857 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 858 SCTP_SOCKET_UNLOCK(so, 1); 859 #endif 860 } 861 /* goto SHUTDOWN_RECEIVED state to block new requests */ 862 if (stcb->sctp_socket) { 863 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 864 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 865 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 866 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 867 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 868 /* 869 * notify upper layer that peer has initiated a 870 * shutdown 871 */ 872 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 873 874 /* reset time */ 875 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 876 } 877 } 878 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 879 /* 880 * stop the shutdown timer, since we WILL move to 881 * SHUTDOWN-ACK-SENT. 882 */ 883 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 884 } 885 /* Now is there unsent data on a stream somewhere? */ 886 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 887 888 if (!TAILQ_EMPTY(&asoc->send_queue) || 889 !TAILQ_EMPTY(&asoc->sent_queue) || 890 some_on_streamwheel) { 891 /* By returning we will push more data out */ 892 return; 893 } else { 894 /* no outstanding data to send, so move on... */ 895 /* send SHUTDOWN-ACK */ 896 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 897 /* move to SHUTDOWN-ACK-SENT state */ 898 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 899 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 900 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 901 } 902 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 903 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 904 sctp_stop_timers_for_shutdown(stcb); 905 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 906 stcb, net); 907 } 908 } 909 910 static void 911 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 912 struct sctp_tcb *stcb, 913 struct sctp_nets *net) 914 { 915 struct sctp_association *asoc; 916 917 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 918 struct socket *so; 919 920 so = SCTP_INP_SO(stcb->sctp_ep); 921 #endif 922 SCTPDBG(SCTP_DEBUG_INPUT2, 923 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 924 if (stcb == NULL) 925 return; 926 927 asoc = &stcb->asoc; 928 /* process according to association state */ 929 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 930 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 931 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 932 sctp_send_shutdown_complete(stcb, net, 1); 933 SCTP_TCB_UNLOCK(stcb); 934 return; 935 } 936 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 937 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 938 /* unexpected SHUTDOWN-ACK... so ignore... */ 939 SCTP_TCB_UNLOCK(stcb); 940 return; 941 } 942 if (asoc->control_pdapi) { 943 /* 944 * With a normal shutdown we assume the end of last record. 945 */ 946 SCTP_INP_READ_LOCK(stcb->sctp_ep); 947 asoc->control_pdapi->end_added = 1; 948 asoc->control_pdapi->pdapi_aborted = 1; 949 asoc->control_pdapi = NULL; 950 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 951 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 952 atomic_add_int(&stcb->asoc.refcnt, 1); 953 SCTP_TCB_UNLOCK(stcb); 954 SCTP_SOCKET_LOCK(so, 1); 955 SCTP_TCB_LOCK(stcb); 956 atomic_subtract_int(&stcb->asoc.refcnt, 1); 957 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 958 /* assoc was freed while we were unlocked */ 959 SCTP_SOCKET_UNLOCK(so, 1); 960 return; 961 } 962 #endif 963 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 964 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 965 SCTP_SOCKET_UNLOCK(so, 1); 966 #endif 967 } 968 /* are the queues empty? */ 969 if (!TAILQ_EMPTY(&asoc->send_queue) || 970 !TAILQ_EMPTY(&asoc->sent_queue) || 971 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 972 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 973 } 974 /* stop the timer */ 975 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 976 /* send SHUTDOWN-COMPLETE */ 977 sctp_send_shutdown_complete(stcb, net, 0); 978 /* notify upper layer protocol */ 979 if (stcb->sctp_socket) { 980 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 981 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 982 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 983 /* Set the connected flag to disconnected */ 984 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 985 } 986 } 987 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 988 /* free the TCB but first save off the ep */ 989 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 990 atomic_add_int(&stcb->asoc.refcnt, 1); 991 SCTP_TCB_UNLOCK(stcb); 992 SCTP_SOCKET_LOCK(so, 1); 993 SCTP_TCB_LOCK(stcb); 994 atomic_subtract_int(&stcb->asoc.refcnt, 1); 995 #endif 996 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 997 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 998 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 999 SCTP_SOCKET_UNLOCK(so, 1); 1000 #endif 1001 } 1002 1003 /* 1004 * Skip past the param header and then we will find the chunk that caused the 1005 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1006 * our peer must be broken. 1007 */ 1008 static void 1009 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1010 struct sctp_nets *net) 1011 { 1012 struct sctp_chunkhdr *chk; 1013 1014 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1015 switch (chk->chunk_type) { 1016 case SCTP_ASCONF_ACK: 1017 case SCTP_ASCONF: 1018 sctp_asconf_cleanup(stcb, net); 1019 break; 1020 case SCTP_FORWARD_CUM_TSN: 1021 stcb->asoc.peer_supports_prsctp = 0; 1022 break; 1023 default: 1024 SCTPDBG(SCTP_DEBUG_INPUT2, 1025 "Peer does not support chunk type %d(%x)??\n", 1026 chk->chunk_type, (uint32_t) chk->chunk_type); 1027 break; 1028 } 1029 } 1030 1031 /* 1032 * Skip past the param header and then we will find the param that caused the 1033 * problem. There are a number of param's in a ASCONF OR the prsctp param 1034 * these will turn of specific features. 1035 */ 1036 static void 1037 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1038 { 1039 struct sctp_paramhdr *pbad; 1040 1041 pbad = phdr + 1; 1042 switch (ntohs(pbad->param_type)) { 1043 /* pr-sctp draft */ 1044 case SCTP_PRSCTP_SUPPORTED: 1045 stcb->asoc.peer_supports_prsctp = 0; 1046 break; 1047 case SCTP_SUPPORTED_CHUNK_EXT: 1048 break; 1049 /* draft-ietf-tsvwg-addip-sctp */ 1050 case SCTP_HAS_NAT_SUPPORT: 1051 stcb->asoc.peer_supports_nat = 0; 1052 break; 1053 case SCTP_ADD_IP_ADDRESS: 1054 case SCTP_DEL_IP_ADDRESS: 1055 case SCTP_SET_PRIM_ADDR: 1056 stcb->asoc.peer_supports_asconf = 0; 1057 break; 1058 case SCTP_SUCCESS_REPORT: 1059 case SCTP_ERROR_CAUSE_IND: 1060 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1061 SCTPDBG(SCTP_DEBUG_INPUT2, 1062 "Turning off ASCONF to this strange peer\n"); 1063 stcb->asoc.peer_supports_asconf = 0; 1064 break; 1065 default: 1066 SCTPDBG(SCTP_DEBUG_INPUT2, 1067 "Peer does not support param type %d(%x)??\n", 1068 pbad->param_type, (uint32_t) pbad->param_type); 1069 break; 1070 } 1071 } 1072 1073 static int 1074 sctp_handle_error(struct sctp_chunkhdr *ch, 1075 struct sctp_tcb *stcb, struct sctp_nets *net) 1076 { 1077 int chklen; 1078 struct sctp_paramhdr *phdr; 1079 uint16_t error_type; 1080 uint16_t error_len; 1081 struct sctp_association *asoc; 1082 int adjust; 1083 1084 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1085 struct socket *so; 1086 1087 #endif 1088 1089 /* parse through all of the errors and process */ 1090 asoc = &stcb->asoc; 1091 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1092 sizeof(struct sctp_chunkhdr)); 1093 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1094 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1095 /* Process an Error Cause */ 1096 error_type = ntohs(phdr->param_type); 1097 error_len = ntohs(phdr->param_length); 1098 if ((error_len > chklen) || (error_len == 0)) { 1099 /* invalid param length for this param */ 1100 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1101 chklen, error_len); 1102 return (0); 1103 } 1104 switch (error_type) { 1105 case SCTP_CAUSE_INVALID_STREAM: 1106 case SCTP_CAUSE_MISSING_PARAM: 1107 case SCTP_CAUSE_INVALID_PARAM: 1108 case SCTP_CAUSE_NO_USER_DATA: 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1110 error_type); 1111 break; 1112 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1114 ch->chunk_flags); 1115 if (sctp_handle_nat_colliding_state(stcb)) { 1116 return (0); 1117 } 1118 break; 1119 case SCTP_CAUSE_NAT_MISSING_STATE: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1121 ch->chunk_flags); 1122 if (sctp_handle_nat_missing_state(stcb, net)) { 1123 return (0); 1124 } 1125 break; 1126 case SCTP_CAUSE_STALE_COOKIE: 1127 /* 1128 * We only act if we have echoed a cookie and are 1129 * waiting. 1130 */ 1131 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1132 int *p; 1133 1134 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1135 /* Save the time doubled */ 1136 asoc->cookie_preserve_req = ntohl(*p) << 1; 1137 asoc->stale_cookie_count++; 1138 if (asoc->stale_cookie_count > 1139 asoc->max_init_times) { 1140 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1141 /* now free the asoc */ 1142 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1143 so = SCTP_INP_SO(stcb->sctp_ep); 1144 atomic_add_int(&stcb->asoc.refcnt, 1); 1145 SCTP_TCB_UNLOCK(stcb); 1146 SCTP_SOCKET_LOCK(so, 1); 1147 SCTP_TCB_LOCK(stcb); 1148 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1149 #endif 1150 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1151 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1153 SCTP_SOCKET_UNLOCK(so, 1); 1154 #endif 1155 return (-1); 1156 } 1157 /* blast back to INIT state */ 1158 sctp_toss_old_cookies(stcb, &stcb->asoc); 1159 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1160 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1161 sctp_stop_all_cookie_timers(stcb); 1162 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1163 } 1164 break; 1165 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1166 /* 1167 * Nothing we can do here, we don't do hostname 1168 * addresses so if the peer does not like my IPv6 1169 * (or IPv4 for that matter) it does not matter. If 1170 * they don't support that type of address, they can 1171 * NOT possibly get that packet type... i.e. with no 1172 * IPv6 you can't recieve a IPv6 packet. so we can 1173 * safely ignore this one. If we ever added support 1174 * for HOSTNAME Addresses, then we would need to do 1175 * something here. 1176 */ 1177 break; 1178 case SCTP_CAUSE_UNRECOG_CHUNK: 1179 sctp_process_unrecog_chunk(stcb, phdr, net); 1180 break; 1181 case SCTP_CAUSE_UNRECOG_PARAM: 1182 sctp_process_unrecog_param(stcb, phdr); 1183 break; 1184 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1185 /* 1186 * We ignore this since the timer will drive out a 1187 * new cookie anyway and there timer will drive us 1188 * to send a SHUTDOWN_COMPLETE. We can't send one 1189 * here since we don't have their tag. 1190 */ 1191 break; 1192 case SCTP_CAUSE_DELETING_LAST_ADDR: 1193 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1194 case SCTP_CAUSE_DELETING_SRC_ADDR: 1195 /* 1196 * We should NOT get these here, but in a 1197 * ASCONF-ACK. 1198 */ 1199 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1200 error_type); 1201 break; 1202 case SCTP_CAUSE_OUT_OF_RESC: 1203 /* 1204 * And what, pray tell do we do with the fact that 1205 * the peer is out of resources? Not really sure we 1206 * could do anything but abort. I suspect this 1207 * should have came WITH an abort instead of in a 1208 * OP-ERROR. 1209 */ 1210 break; 1211 default: 1212 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1213 error_type); 1214 break; 1215 } 1216 adjust = SCTP_SIZE32(error_len); 1217 chklen -= adjust; 1218 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1219 } 1220 return (0); 1221 } 1222 1223 static int 1224 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1225 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1226 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1227 { 1228 struct sctp_init_ack *init_ack; 1229 struct mbuf *op_err; 1230 1231 SCTPDBG(SCTP_DEBUG_INPUT2, 1232 "sctp_handle_init_ack: handling INIT-ACK\n"); 1233 1234 if (stcb == NULL) { 1235 SCTPDBG(SCTP_DEBUG_INPUT2, 1236 "sctp_handle_init_ack: TCB is null\n"); 1237 return (-1); 1238 } 1239 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1240 /* Invalid length */ 1241 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1242 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1243 op_err, 0, net->port); 1244 *abort_no_unlock = 1; 1245 return (-1); 1246 } 1247 init_ack = &cp->init; 1248 /* validate parameters */ 1249 if (init_ack->initiate_tag == 0) { 1250 /* protocol error... send an abort */ 1251 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1252 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1253 op_err, 0, net->port); 1254 *abort_no_unlock = 1; 1255 return (-1); 1256 } 1257 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1258 /* protocol error... send an abort */ 1259 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1260 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1261 op_err, 0, net->port); 1262 *abort_no_unlock = 1; 1263 return (-1); 1264 } 1265 if (init_ack->num_inbound_streams == 0) { 1266 /* protocol error... send an abort */ 1267 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1268 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1269 op_err, 0, net->port); 1270 *abort_no_unlock = 1; 1271 return (-1); 1272 } 1273 if (init_ack->num_outbound_streams == 0) { 1274 /* protocol error... send an abort */ 1275 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1276 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1277 op_err, 0, net->port); 1278 *abort_no_unlock = 1; 1279 return (-1); 1280 } 1281 /* process according to association state... */ 1282 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1283 case SCTP_STATE_COOKIE_WAIT: 1284 /* this is the expected state for this chunk */ 1285 /* process the INIT-ACK parameters */ 1286 if (stcb->asoc.primary_destination->dest_state & 1287 SCTP_ADDR_UNCONFIRMED) { 1288 /* 1289 * The primary is where we sent the INIT, we can 1290 * always consider it confirmed when the INIT-ACK is 1291 * returned. Do this before we load addresses 1292 * though. 1293 */ 1294 stcb->asoc.primary_destination->dest_state &= 1295 ~SCTP_ADDR_UNCONFIRMED; 1296 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1297 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1298 } 1299 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1300 net, abort_no_unlock, vrf_id) < 0) { 1301 /* error in parsing parameters */ 1302 return (-1); 1303 } 1304 /* update our state */ 1305 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1306 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1307 1308 /* reset the RTO calc */ 1309 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1310 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1311 stcb->asoc.overall_error_count, 1312 0, 1313 SCTP_FROM_SCTP_INPUT, 1314 __LINE__); 1315 } 1316 stcb->asoc.overall_error_count = 0; 1317 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1318 /* 1319 * collapse the init timer back in case of a exponential 1320 * backoff 1321 */ 1322 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1323 stcb, net); 1324 /* 1325 * the send at the end of the inbound data processing will 1326 * cause the cookie to be sent 1327 */ 1328 break; 1329 case SCTP_STATE_SHUTDOWN_SENT: 1330 /* incorrect state... discard */ 1331 break; 1332 case SCTP_STATE_COOKIE_ECHOED: 1333 /* incorrect state... discard */ 1334 break; 1335 case SCTP_STATE_OPEN: 1336 /* incorrect state... discard */ 1337 break; 1338 case SCTP_STATE_EMPTY: 1339 case SCTP_STATE_INUSE: 1340 default: 1341 /* incorrect state... discard */ 1342 return (-1); 1343 break; 1344 } 1345 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1346 return (0); 1347 } 1348 1349 static struct sctp_tcb * 1350 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1351 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1352 struct sctp_inpcb *inp, struct sctp_nets **netp, 1353 struct sockaddr *init_src, int *notification, 1354 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1355 uint32_t vrf_id, uint16_t port); 1356 1357 1358 /* 1359 * handle a state cookie for an existing association m: input packet mbuf 1360 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1361 * "split" mbuf and the cookie signature does not exist offset: offset into 1362 * mbuf to the cookie-echo chunk 1363 */ 1364 static struct sctp_tcb * 1365 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1366 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1367 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1368 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1369 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1370 { 1371 struct sctp_association *asoc; 1372 struct sctp_init_chunk *init_cp, init_buf; 1373 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1374 struct sctp_nets *net; 1375 struct mbuf *op_err; 1376 struct sctp_paramhdr *ph; 1377 int chk_length; 1378 int init_offset, initack_offset, i; 1379 int retval; 1380 int spec_flag = 0; 1381 uint32_t how_indx; 1382 1383 net = *netp; 1384 /* I know that the TCB is non-NULL from the caller */ 1385 asoc = &stcb->asoc; 1386 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1387 if (asoc->cookie_how[how_indx] == 0) 1388 break; 1389 } 1390 if (how_indx < sizeof(asoc->cookie_how)) { 1391 asoc->cookie_how[how_indx] = 1; 1392 } 1393 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1394 /* SHUTDOWN came in after sending INIT-ACK */ 1395 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1396 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1397 0, M_DONTWAIT, 1, MT_DATA); 1398 if (op_err == NULL) { 1399 /* FOOBAR */ 1400 return (NULL); 1401 } 1402 /* Set the len */ 1403 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1404 ph = mtod(op_err, struct sctp_paramhdr *); 1405 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1406 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1407 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1408 vrf_id, net->port); 1409 if (how_indx < sizeof(asoc->cookie_how)) 1410 asoc->cookie_how[how_indx] = 2; 1411 return (NULL); 1412 } 1413 /* 1414 * find and validate the INIT chunk in the cookie (peer's info) the 1415 * INIT should start after the cookie-echo header struct (chunk 1416 * header, state cookie header struct) 1417 */ 1418 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1419 1420 init_cp = (struct sctp_init_chunk *) 1421 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1422 (uint8_t *) & init_buf); 1423 if (init_cp == NULL) { 1424 /* could not pull a INIT chunk in cookie */ 1425 return (NULL); 1426 } 1427 chk_length = ntohs(init_cp->ch.chunk_length); 1428 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1429 return (NULL); 1430 } 1431 /* 1432 * find and validate the INIT-ACK chunk in the cookie (my info) the 1433 * INIT-ACK follows the INIT chunk 1434 */ 1435 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1436 initack_cp = (struct sctp_init_ack_chunk *) 1437 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1438 (uint8_t *) & initack_buf); 1439 if (initack_cp == NULL) { 1440 /* could not pull INIT-ACK chunk in cookie */ 1441 return (NULL); 1442 } 1443 chk_length = ntohs(initack_cp->ch.chunk_length); 1444 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1445 return (NULL); 1446 } 1447 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1448 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1449 /* 1450 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1451 * to get into the OPEN state 1452 */ 1453 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1454 /*- 1455 * Opps, this means that we somehow generated two vtag's 1456 * the same. I.e. we did: 1457 * Us Peer 1458 * <---INIT(tag=a)------ 1459 * ----INIT-ACK(tag=t)--> 1460 * ----INIT(tag=t)------> *1 1461 * <---INIT-ACK(tag=a)--- 1462 * <----CE(tag=t)------------- *2 1463 * 1464 * At point *1 we should be generating a different 1465 * tag t'. Which means we would throw away the CE and send 1466 * ours instead. Basically this is case C (throw away side). 1467 */ 1468 if (how_indx < sizeof(asoc->cookie_how)) 1469 asoc->cookie_how[how_indx] = 17; 1470 return (NULL); 1471 1472 } 1473 switch SCTP_GET_STATE 1474 (asoc) { 1475 case SCTP_STATE_COOKIE_WAIT: 1476 case SCTP_STATE_COOKIE_ECHOED: 1477 /* 1478 * INIT was sent but got a COOKIE_ECHO with the 1479 * correct tags... just accept it...but we must 1480 * process the init so that we can make sure we have 1481 * the right seq no's. 1482 */ 1483 /* First we must process the INIT !! */ 1484 retval = sctp_process_init(init_cp, stcb, net); 1485 if (retval < 0) { 1486 if (how_indx < sizeof(asoc->cookie_how)) 1487 asoc->cookie_how[how_indx] = 3; 1488 return (NULL); 1489 } 1490 /* we have already processed the INIT so no problem */ 1491 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1492 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1493 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1494 /* update current state */ 1495 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1496 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1497 else 1498 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1499 1500 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1501 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1502 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1503 stcb->sctp_ep, stcb, asoc->primary_destination); 1504 } 1505 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1506 sctp_stop_all_cookie_timers(stcb); 1507 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1508 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1509 (inp->sctp_socket->so_qlimit == 0) 1510 ) { 1511 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1512 struct socket *so; 1513 1514 #endif 1515 /* 1516 * Here is where collision would go if we 1517 * did a connect() and instead got a 1518 * init/init-ack/cookie done before the 1519 * init-ack came back.. 1520 */ 1521 stcb->sctp_ep->sctp_flags |= 1522 SCTP_PCB_FLAGS_CONNECTED; 1523 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1524 so = SCTP_INP_SO(stcb->sctp_ep); 1525 atomic_add_int(&stcb->asoc.refcnt, 1); 1526 SCTP_TCB_UNLOCK(stcb); 1527 SCTP_SOCKET_LOCK(so, 1); 1528 SCTP_TCB_LOCK(stcb); 1529 atomic_add_int(&stcb->asoc.refcnt, -1); 1530 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1531 SCTP_SOCKET_UNLOCK(so, 1); 1532 return (NULL); 1533 } 1534 #endif 1535 soisconnected(stcb->sctp_socket); 1536 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1537 SCTP_SOCKET_UNLOCK(so, 1); 1538 #endif 1539 } 1540 /* notify upper layer */ 1541 *notification = SCTP_NOTIFY_ASSOC_UP; 1542 /* 1543 * since we did not send a HB make sure we don't 1544 * double things 1545 */ 1546 net->hb_responded = 1; 1547 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1548 &cookie->time_entered, 1549 sctp_align_unsafe_makecopy, 1550 SCTP_DETERMINE_LL_NOTOK); 1551 1552 if (stcb->asoc.sctp_autoclose_ticks && 1553 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1554 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1555 inp, stcb, NULL); 1556 } 1557 break; 1558 default: 1559 /* 1560 * we're in the OPEN state (or beyond), so peer must 1561 * have simply lost the COOKIE-ACK 1562 */ 1563 break; 1564 } /* end switch */ 1565 sctp_stop_all_cookie_timers(stcb); 1566 /* 1567 * We ignore the return code here.. not sure if we should 1568 * somehow abort.. but we do have an existing asoc. This 1569 * really should not fail. 1570 */ 1571 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1572 init_offset + sizeof(struct sctp_init_chunk), 1573 initack_offset, sh, init_src)) { 1574 if (how_indx < sizeof(asoc->cookie_how)) 1575 asoc->cookie_how[how_indx] = 4; 1576 return (NULL); 1577 } 1578 /* respond with a COOKIE-ACK */ 1579 sctp_toss_old_cookies(stcb, asoc); 1580 sctp_send_cookie_ack(stcb); 1581 if (how_indx < sizeof(asoc->cookie_how)) 1582 asoc->cookie_how[how_indx] = 5; 1583 return (stcb); 1584 } 1585 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1586 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1587 cookie->tie_tag_my_vtag == 0 && 1588 cookie->tie_tag_peer_vtag == 0) { 1589 /* 1590 * case C in Section 5.2.4 Table 2: XMOO silently discard 1591 */ 1592 if (how_indx < sizeof(asoc->cookie_how)) 1593 asoc->cookie_how[how_indx] = 6; 1594 return (NULL); 1595 } 1596 /* 1597 * If nat support, and the below and stcb is established, send back 1598 * a ABORT(colliding state) if we are established. 1599 */ 1600 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1601 (asoc->peer_supports_nat) && 1602 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1603 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1604 (asoc->peer_vtag == 0)))) { 1605 /* 1606 * Special case - Peer's support nat. We may have two init's 1607 * that we gave out the same tag on since one was not 1608 * established.. i.e. we get INIT from host-1 behind the nat 1609 * and we respond tag-a, we get a INIT from host-2 behind 1610 * the nat and we get tag-a again. Then we bring up host-1 1611 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1612 * Now we have colliding state. We must send an abort here 1613 * with colliding state indication. 1614 */ 1615 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1616 0, M_DONTWAIT, 1, MT_DATA); 1617 if (op_err == NULL) { 1618 /* FOOBAR */ 1619 return (NULL); 1620 } 1621 /* pre-reserve some space */ 1622 #ifdef INET6 1623 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1624 #else 1625 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1626 #endif 1627 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1628 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1629 /* Set the len */ 1630 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1631 ph = mtod(op_err, struct sctp_paramhdr *); 1632 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1633 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1634 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1635 return (NULL); 1636 } 1637 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1638 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1639 (asoc->peer_vtag == 0))) { 1640 /* 1641 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1642 * should be ok, re-accept peer info 1643 */ 1644 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1645 /* 1646 * Extension of case C. If we hit this, then the 1647 * random number generator returned the same vtag 1648 * when we first sent our INIT-ACK and when we later 1649 * sent our INIT. The side with the seq numbers that 1650 * are different will be the one that normnally 1651 * would have hit case C. This in effect "extends" 1652 * our vtags in this collision case to be 64 bits. 1653 * The same collision could occur aka you get both 1654 * vtag and seq number the same twice in a row.. but 1655 * is much less likely. If it did happen then we 1656 * would proceed through and bring up the assoc.. we 1657 * may end up with the wrong stream setup however.. 1658 * which would be bad.. but there is no way to 1659 * tell.. until we send on a stream that does not 1660 * exist :-) 1661 */ 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 7; 1664 1665 return (NULL); 1666 } 1667 if (how_indx < sizeof(asoc->cookie_how)) 1668 asoc->cookie_how[how_indx] = 8; 1669 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1670 sctp_stop_all_cookie_timers(stcb); 1671 /* 1672 * since we did not send a HB make sure we don't double 1673 * things 1674 */ 1675 net->hb_responded = 1; 1676 if (stcb->asoc.sctp_autoclose_ticks && 1677 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1678 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1679 NULL); 1680 } 1681 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1682 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1683 1684 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1685 /* 1686 * Ok the peer probably discarded our data (if we 1687 * echoed a cookie+data). So anything on the 1688 * sent_queue should be marked for retransmit, we 1689 * may not get something to kick us so it COULD 1690 * still take a timeout to move these.. but it can't 1691 * hurt to mark them. 1692 */ 1693 struct sctp_tmit_chunk *chk; 1694 1695 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1696 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1697 chk->sent = SCTP_DATAGRAM_RESEND; 1698 sctp_flight_size_decrease(chk); 1699 sctp_total_flight_decrease(stcb, chk); 1700 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1701 spec_flag++; 1702 } 1703 } 1704 1705 } 1706 /* process the INIT info (peer's info) */ 1707 retval = sctp_process_init(init_cp, stcb, net); 1708 if (retval < 0) { 1709 if (how_indx < sizeof(asoc->cookie_how)) 1710 asoc->cookie_how[how_indx] = 9; 1711 return (NULL); 1712 } 1713 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1714 init_offset + sizeof(struct sctp_init_chunk), 1715 initack_offset, sh, init_src)) { 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 10; 1718 return (NULL); 1719 } 1720 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1721 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1722 *notification = SCTP_NOTIFY_ASSOC_UP; 1723 1724 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1725 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1726 (inp->sctp_socket->so_qlimit == 0)) { 1727 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1728 struct socket *so; 1729 1730 #endif 1731 stcb->sctp_ep->sctp_flags |= 1732 SCTP_PCB_FLAGS_CONNECTED; 1733 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1734 so = SCTP_INP_SO(stcb->sctp_ep); 1735 atomic_add_int(&stcb->asoc.refcnt, 1); 1736 SCTP_TCB_UNLOCK(stcb); 1737 SCTP_SOCKET_LOCK(so, 1); 1738 SCTP_TCB_LOCK(stcb); 1739 atomic_add_int(&stcb->asoc.refcnt, -1); 1740 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1741 SCTP_SOCKET_UNLOCK(so, 1); 1742 return (NULL); 1743 } 1744 #endif 1745 soisconnected(stcb->sctp_socket); 1746 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1747 SCTP_SOCKET_UNLOCK(so, 1); 1748 #endif 1749 } 1750 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1751 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1752 else 1753 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1754 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1755 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1756 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1757 } else { 1758 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1759 } 1760 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1761 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1762 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1763 stcb->sctp_ep, stcb, asoc->primary_destination); 1764 } 1765 sctp_stop_all_cookie_timers(stcb); 1766 sctp_toss_old_cookies(stcb, asoc); 1767 sctp_send_cookie_ack(stcb); 1768 if (spec_flag) { 1769 /* 1770 * only if we have retrans set do we do this. What 1771 * this call does is get only the COOKIE-ACK out and 1772 * then when we return the normal call to 1773 * sctp_chunk_output will get the retrans out behind 1774 * this. 1775 */ 1776 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1777 } 1778 if (how_indx < sizeof(asoc->cookie_how)) 1779 asoc->cookie_how[how_indx] = 11; 1780 1781 return (stcb); 1782 } 1783 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1784 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1785 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1786 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1787 cookie->tie_tag_peer_vtag != 0) { 1788 struct sctpasochead *head; 1789 1790 if (asoc->peer_supports_nat) { 1791 /* 1792 * This is a gross gross hack. just call the 1793 * cookie_new code since we are allowing a duplicate 1794 * association. I hope this works... 1795 */ 1796 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1797 inp, netp, init_src, notification, 1798 auth_skipped, auth_offset, auth_len, 1799 vrf_id, port)); 1800 } 1801 /* 1802 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1803 */ 1804 /* temp code */ 1805 if (how_indx < sizeof(asoc->cookie_how)) 1806 asoc->cookie_how[how_indx] = 12; 1807 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1808 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1809 1810 *sac_assoc_id = sctp_get_associd(stcb); 1811 /* notify upper layer */ 1812 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1813 atomic_add_int(&stcb->asoc.refcnt, 1); 1814 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1815 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1816 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1817 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1818 } 1819 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1820 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1821 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1822 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1823 } 1824 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1825 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1826 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1827 stcb->sctp_ep, stcb, asoc->primary_destination); 1828 1829 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1830 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1831 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1832 } 1833 asoc->pre_open_streams = 1834 ntohs(initack_cp->init.num_outbound_streams); 1835 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1836 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1837 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1838 1839 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1840 1841 asoc->str_reset_seq_in = asoc->init_seq_number; 1842 1843 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1844 if (asoc->mapping_array) { 1845 memset(asoc->mapping_array, 0, 1846 asoc->mapping_array_size); 1847 } 1848 if (asoc->nr_mapping_array) { 1849 memset(asoc->nr_mapping_array, 0, 1850 asoc->mapping_array_size); 1851 } 1852 SCTP_TCB_UNLOCK(stcb); 1853 SCTP_INP_INFO_WLOCK(); 1854 SCTP_INP_WLOCK(stcb->sctp_ep); 1855 SCTP_TCB_LOCK(stcb); 1856 atomic_add_int(&stcb->asoc.refcnt, -1); 1857 /* send up all the data */ 1858 SCTP_TCB_SEND_LOCK(stcb); 1859 1860 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1861 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1862 stcb->asoc.strmout[i].stream_no = i; 1863 stcb->asoc.strmout[i].next_sequence_sent = 0; 1864 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1865 } 1866 /* process the INIT-ACK info (my info) */ 1867 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1868 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1869 1870 /* pull from vtag hash */ 1871 LIST_REMOVE(stcb, sctp_asocs); 1872 /* re-insert to new vtag position */ 1873 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1874 SCTP_BASE_INFO(hashasocmark))]; 1875 /* 1876 * put it in the bucket in the vtag hash of assoc's for the 1877 * system 1878 */ 1879 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1880 1881 /* process the INIT info (peer's info) */ 1882 SCTP_TCB_SEND_UNLOCK(stcb); 1883 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1884 SCTP_INP_INFO_WUNLOCK(); 1885 1886 retval = sctp_process_init(init_cp, stcb, net); 1887 if (retval < 0) { 1888 if (how_indx < sizeof(asoc->cookie_how)) 1889 asoc->cookie_how[how_indx] = 13; 1890 1891 return (NULL); 1892 } 1893 /* 1894 * since we did not send a HB make sure we don't double 1895 * things 1896 */ 1897 net->hb_responded = 1; 1898 1899 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1900 init_offset + sizeof(struct sctp_init_chunk), 1901 initack_offset, sh, init_src)) { 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 14; 1904 1905 return (NULL); 1906 } 1907 /* respond with a COOKIE-ACK */ 1908 sctp_stop_all_cookie_timers(stcb); 1909 sctp_toss_old_cookies(stcb, asoc); 1910 sctp_send_cookie_ack(stcb); 1911 if (how_indx < sizeof(asoc->cookie_how)) 1912 asoc->cookie_how[how_indx] = 15; 1913 1914 return (stcb); 1915 } 1916 if (how_indx < sizeof(asoc->cookie_how)) 1917 asoc->cookie_how[how_indx] = 16; 1918 /* all other cases... */ 1919 return (NULL); 1920 } 1921 1922 1923 /* 1924 * handle a state cookie for a new association m: input packet mbuf chain-- 1925 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1926 * and the cookie signature does not exist offset: offset into mbuf to the 1927 * cookie-echo chunk length: length of the cookie chunk to: where the init 1928 * was from returns a new TCB 1929 */ 1930 struct sctp_tcb * 1931 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1932 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1933 struct sctp_inpcb *inp, struct sctp_nets **netp, 1934 struct sockaddr *init_src, int *notification, 1935 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1936 uint32_t vrf_id, uint16_t port) 1937 { 1938 struct sctp_tcb *stcb; 1939 struct sctp_init_chunk *init_cp, init_buf; 1940 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1941 struct sockaddr_storage sa_store; 1942 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1943 struct sockaddr_in *sin; 1944 struct sockaddr_in6 *sin6; 1945 struct sctp_association *asoc; 1946 int chk_length; 1947 int init_offset, initack_offset, initack_limit; 1948 int retval; 1949 int error = 0; 1950 uint32_t old_tag; 1951 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1952 1953 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1954 struct socket *so; 1955 1956 so = SCTP_INP_SO(inp); 1957 #endif 1958 1959 /* 1960 * find and validate the INIT chunk in the cookie (peer's info) the 1961 * INIT should start after the cookie-echo header struct (chunk 1962 * header, state cookie header struct) 1963 */ 1964 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1965 init_cp = (struct sctp_init_chunk *) 1966 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1967 (uint8_t *) & init_buf); 1968 if (init_cp == NULL) { 1969 /* could not pull a INIT chunk in cookie */ 1970 SCTPDBG(SCTP_DEBUG_INPUT1, 1971 "process_cookie_new: could not pull INIT chunk hdr\n"); 1972 return (NULL); 1973 } 1974 chk_length = ntohs(init_cp->ch.chunk_length); 1975 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1976 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1977 return (NULL); 1978 } 1979 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1980 /* 1981 * find and validate the INIT-ACK chunk in the cookie (my info) the 1982 * INIT-ACK follows the INIT chunk 1983 */ 1984 initack_cp = (struct sctp_init_ack_chunk *) 1985 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1986 (uint8_t *) & initack_buf); 1987 if (initack_cp == NULL) { 1988 /* could not pull INIT-ACK chunk in cookie */ 1989 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1990 return (NULL); 1991 } 1992 chk_length = ntohs(initack_cp->ch.chunk_length); 1993 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1994 return (NULL); 1995 } 1996 /* 1997 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1998 * "initack_limit" value. This is because the chk_length field 1999 * includes the length of the cookie, but the cookie is omitted when 2000 * the INIT and INIT_ACK are tacked onto the cookie... 2001 */ 2002 initack_limit = offset + cookie_len; 2003 2004 /* 2005 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2006 * and popluate 2007 */ 2008 2009 /* 2010 * Here we do a trick, we set in NULL for the proc/thread argument. 2011 * We do this since in effect we only use the p argument when the 2012 * socket is unbound and we must do an implicit bind. Since we are 2013 * getting a cookie, we cannot be unbound. 2014 */ 2015 stcb = sctp_aloc_assoc(inp, init_src, &error, 2016 ntohl(initack_cp->init.initiate_tag), vrf_id, 2017 (struct thread *)NULL 2018 ); 2019 if (stcb == NULL) { 2020 struct mbuf *op_err; 2021 2022 /* memory problem? */ 2023 SCTPDBG(SCTP_DEBUG_INPUT1, 2024 "process_cookie_new: no room for another TCB!\n"); 2025 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2026 2027 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2028 sh, op_err, vrf_id, port); 2029 return (NULL); 2030 } 2031 /* get the correct sctp_nets */ 2032 if (netp) 2033 *netp = sctp_findnet(stcb, init_src); 2034 2035 asoc = &stcb->asoc; 2036 /* get scope variables out of cookie */ 2037 asoc->ipv4_local_scope = cookie->ipv4_scope; 2038 asoc->site_scope = cookie->site_scope; 2039 asoc->local_scope = cookie->local_scope; 2040 asoc->loopback_scope = cookie->loopback_scope; 2041 2042 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2043 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2044 struct mbuf *op_err; 2045 2046 /* 2047 * Houston we have a problem. The EP changed while the 2048 * cookie was in flight. Only recourse is to abort the 2049 * association. 2050 */ 2051 atomic_add_int(&stcb->asoc.refcnt, 1); 2052 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2053 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2054 sh, op_err, vrf_id, port); 2055 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2056 SCTP_TCB_UNLOCK(stcb); 2057 SCTP_SOCKET_LOCK(so, 1); 2058 SCTP_TCB_LOCK(stcb); 2059 #endif 2060 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2061 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2062 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2063 SCTP_SOCKET_UNLOCK(so, 1); 2064 #endif 2065 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2066 return (NULL); 2067 } 2068 /* process the INIT-ACK info (my info) */ 2069 old_tag = asoc->my_vtag; 2070 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2071 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2072 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2073 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2074 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2075 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2076 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2077 asoc->str_reset_seq_in = asoc->init_seq_number; 2078 2079 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2080 2081 /* process the INIT info (peer's info) */ 2082 if (netp) 2083 retval = sctp_process_init(init_cp, stcb, *netp); 2084 else 2085 retval = 0; 2086 if (retval < 0) { 2087 atomic_add_int(&stcb->asoc.refcnt, 1); 2088 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2089 SCTP_TCB_UNLOCK(stcb); 2090 SCTP_SOCKET_LOCK(so, 1); 2091 SCTP_TCB_LOCK(stcb); 2092 #endif 2093 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2094 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2095 SCTP_SOCKET_UNLOCK(so, 1); 2096 #endif 2097 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2098 return (NULL); 2099 } 2100 /* load all addresses */ 2101 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2102 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2103 init_src)) { 2104 atomic_add_int(&stcb->asoc.refcnt, 1); 2105 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2106 SCTP_TCB_UNLOCK(stcb); 2107 SCTP_SOCKET_LOCK(so, 1); 2108 SCTP_TCB_LOCK(stcb); 2109 #endif 2110 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2111 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2112 SCTP_SOCKET_UNLOCK(so, 1); 2113 #endif 2114 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2115 return (NULL); 2116 } 2117 /* 2118 * verify any preceding AUTH chunk that was skipped 2119 */ 2120 /* pull the local authentication parameters from the cookie/init-ack */ 2121 sctp_auth_get_cookie_params(stcb, m, 2122 initack_offset + sizeof(struct sctp_init_ack_chunk), 2123 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2124 if (auth_skipped) { 2125 struct sctp_auth_chunk *auth; 2126 2127 auth = (struct sctp_auth_chunk *) 2128 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2129 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2130 /* auth HMAC failed, dump the assoc and packet */ 2131 SCTPDBG(SCTP_DEBUG_AUTH1, 2132 "COOKIE-ECHO: AUTH failed\n"); 2133 atomic_add_int(&stcb->asoc.refcnt, 1); 2134 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2135 SCTP_TCB_UNLOCK(stcb); 2136 SCTP_SOCKET_LOCK(so, 1); 2137 SCTP_TCB_LOCK(stcb); 2138 #endif 2139 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2141 SCTP_SOCKET_UNLOCK(so, 1); 2142 #endif 2143 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2144 return (NULL); 2145 } else { 2146 /* remaining chunks checked... good to go */ 2147 stcb->asoc.authenticated = 1; 2148 } 2149 } 2150 /* update current state */ 2151 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2152 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2153 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2154 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2155 stcb->sctp_ep, stcb, asoc->primary_destination); 2156 } 2157 sctp_stop_all_cookie_timers(stcb); 2158 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2159 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2160 2161 /* 2162 * if we're doing ASCONFs, check to see if we have any new local 2163 * addresses that need to get added to the peer (eg. addresses 2164 * changed while cookie echo in flight). This needs to be done 2165 * after we go to the OPEN state to do the correct asconf 2166 * processing. else, make sure we have the correct addresses in our 2167 * lists 2168 */ 2169 2170 /* warning, we re-use sin, sin6, sa_store here! */ 2171 /* pull in local_address (our "from" address) */ 2172 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2173 /* source addr is IPv4 */ 2174 sin = (struct sockaddr_in *)initack_src; 2175 memset(sin, 0, sizeof(*sin)); 2176 sin->sin_family = AF_INET; 2177 sin->sin_len = sizeof(struct sockaddr_in); 2178 sin->sin_addr.s_addr = cookie->laddress[0]; 2179 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2180 /* source addr is IPv6 */ 2181 sin6 = (struct sockaddr_in6 *)initack_src; 2182 memset(sin6, 0, sizeof(*sin6)); 2183 sin6->sin6_family = AF_INET6; 2184 sin6->sin6_len = sizeof(struct sockaddr_in6); 2185 sin6->sin6_scope_id = cookie->scope_id; 2186 memcpy(&sin6->sin6_addr, cookie->laddress, 2187 sizeof(sin6->sin6_addr)); 2188 } else { 2189 atomic_add_int(&stcb->asoc.refcnt, 1); 2190 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2191 SCTP_TCB_UNLOCK(stcb); 2192 SCTP_SOCKET_LOCK(so, 1); 2193 SCTP_TCB_LOCK(stcb); 2194 #endif 2195 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2196 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2197 SCTP_SOCKET_UNLOCK(so, 1); 2198 #endif 2199 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2200 return (NULL); 2201 } 2202 2203 /* set up to notify upper layer */ 2204 *notification = SCTP_NOTIFY_ASSOC_UP; 2205 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2206 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2207 (inp->sctp_socket->so_qlimit == 0)) { 2208 /* 2209 * This is an endpoint that called connect() how it got a 2210 * cookie that is NEW is a bit of a mystery. It must be that 2211 * the INIT was sent, but before it got there.. a complete 2212 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2213 * should have went to the other code.. not here.. oh well.. 2214 * a bit of protection is worth having.. 2215 */ 2216 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2217 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2218 atomic_add_int(&stcb->asoc.refcnt, 1); 2219 SCTP_TCB_UNLOCK(stcb); 2220 SCTP_SOCKET_LOCK(so, 1); 2221 SCTP_TCB_LOCK(stcb); 2222 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2223 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2224 SCTP_SOCKET_UNLOCK(so, 1); 2225 return (NULL); 2226 } 2227 #endif 2228 soisconnected(stcb->sctp_socket); 2229 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2230 SCTP_SOCKET_UNLOCK(so, 1); 2231 #endif 2232 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2233 (inp->sctp_socket->so_qlimit)) { 2234 /* 2235 * We don't want to do anything with this one. Since it is 2236 * the listening guy. The timer will get started for 2237 * accepted connections in the caller. 2238 */ 2239 ; 2240 } 2241 /* since we did not send a HB make sure we don't double things */ 2242 if ((netp) && (*netp)) 2243 (*netp)->hb_responded = 1; 2244 2245 if (stcb->asoc.sctp_autoclose_ticks && 2246 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2247 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2248 } 2249 /* calculate the RTT */ 2250 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2251 if ((netp) && (*netp)) { 2252 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2253 &cookie->time_entered, sctp_align_unsafe_makecopy, 2254 SCTP_DETERMINE_LL_NOTOK); 2255 } 2256 /* respond with a COOKIE-ACK */ 2257 sctp_send_cookie_ack(stcb); 2258 2259 /* 2260 * check the address lists for any ASCONFs that need to be sent 2261 * AFTER the cookie-ack is sent 2262 */ 2263 sctp_check_address_list(stcb, m, 2264 initack_offset + sizeof(struct sctp_init_ack_chunk), 2265 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2266 initack_src, cookie->local_scope, cookie->site_scope, 2267 cookie->ipv4_scope, cookie->loopback_scope); 2268 2269 2270 return (stcb); 2271 } 2272 2273 /* 2274 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2275 * we NEED to make sure we are not already using the vtag. If so we 2276 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2277 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2278 SCTP_BASE_INFO(hashasocmark))]; 2279 LIST_FOREACH(stcb, head, sctp_asocs) { 2280 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2281 -- SEND ABORT - TRY AGAIN -- 2282 } 2283 } 2284 */ 2285 2286 /* 2287 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2288 * existing (non-NULL) TCB 2289 */ 2290 static struct mbuf * 2291 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2292 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2293 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2294 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2295 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2296 { 2297 struct sctp_state_cookie *cookie; 2298 struct sockaddr_in6 sin6; 2299 struct sockaddr_in sin; 2300 struct sctp_tcb *l_stcb = *stcb; 2301 struct sctp_inpcb *l_inp; 2302 struct sockaddr *to; 2303 sctp_assoc_t sac_restart_id; 2304 struct sctp_pcb *ep; 2305 struct mbuf *m_sig; 2306 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2307 uint8_t *sig; 2308 uint8_t cookie_ok = 0; 2309 unsigned int size_of_pkt, sig_offset, cookie_offset; 2310 unsigned int cookie_len; 2311 struct timeval now; 2312 struct timeval time_expires; 2313 struct sockaddr_storage dest_store; 2314 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2315 struct ip *iph; 2316 int notification = 0; 2317 struct sctp_nets *netl; 2318 int had_a_existing_tcb = 0; 2319 int send_int_conf = 0; 2320 2321 SCTPDBG(SCTP_DEBUG_INPUT2, 2322 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2323 2324 if (inp_p == NULL) { 2325 return (NULL); 2326 } 2327 /* First get the destination address setup too. */ 2328 iph = mtod(m, struct ip *); 2329 switch (iph->ip_v) { 2330 case IPVERSION: 2331 { 2332 /* its IPv4 */ 2333 struct sockaddr_in *lsin; 2334 2335 lsin = (struct sockaddr_in *)(localep_sa); 2336 memset(lsin, 0, sizeof(*lsin)); 2337 lsin->sin_family = AF_INET; 2338 lsin->sin_len = sizeof(*lsin); 2339 lsin->sin_port = sh->dest_port; 2340 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2341 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2342 break; 2343 } 2344 #ifdef INET6 2345 case IPV6_VERSION >> 4: 2346 { 2347 /* its IPv6 */ 2348 struct ip6_hdr *ip6; 2349 struct sockaddr_in6 *lsin6; 2350 2351 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2352 memset(lsin6, 0, sizeof(*lsin6)); 2353 lsin6->sin6_family = AF_INET6; 2354 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2355 ip6 = mtod(m, struct ip6_hdr *); 2356 lsin6->sin6_port = sh->dest_port; 2357 lsin6->sin6_addr = ip6->ip6_dst; 2358 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2359 break; 2360 } 2361 #endif 2362 default: 2363 return (NULL); 2364 } 2365 2366 cookie = &cp->cookie; 2367 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2368 cookie_len = ntohs(cp->ch.chunk_length); 2369 2370 if ((cookie->peerport != sh->src_port) && 2371 (cookie->myport != sh->dest_port) && 2372 (cookie->my_vtag != sh->v_tag)) { 2373 /* 2374 * invalid ports or bad tag. Note that we always leave the 2375 * v_tag in the header in network order and when we stored 2376 * it in the my_vtag slot we also left it in network order. 2377 * This maintains the match even though it may be in the 2378 * opposite byte order of the machine :-> 2379 */ 2380 return (NULL); 2381 } 2382 if (cookie_len > size_of_pkt || 2383 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2384 sizeof(struct sctp_init_chunk) + 2385 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2386 /* cookie too long! or too small */ 2387 return (NULL); 2388 } 2389 /* 2390 * split off the signature into its own mbuf (since it should not be 2391 * calculated in the sctp_hmac_m() call). 2392 */ 2393 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2394 if (sig_offset > size_of_pkt) { 2395 /* packet not correct size! */ 2396 /* XXX this may already be accounted for earlier... */ 2397 return (NULL); 2398 } 2399 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2400 if (m_sig == NULL) { 2401 /* out of memory or ?? */ 2402 return (NULL); 2403 } 2404 #ifdef SCTP_MBUF_LOGGING 2405 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2406 struct mbuf *mat; 2407 2408 mat = m_sig; 2409 while (mat) { 2410 if (SCTP_BUF_IS_EXTENDED(mat)) { 2411 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2412 } 2413 mat = SCTP_BUF_NEXT(mat); 2414 } 2415 } 2416 #endif 2417 2418 /* 2419 * compute the signature/digest for the cookie 2420 */ 2421 ep = &(*inp_p)->sctp_ep; 2422 l_inp = *inp_p; 2423 if (l_stcb) { 2424 SCTP_TCB_UNLOCK(l_stcb); 2425 } 2426 SCTP_INP_RLOCK(l_inp); 2427 if (l_stcb) { 2428 SCTP_TCB_LOCK(l_stcb); 2429 } 2430 /* which cookie is it? */ 2431 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2432 (ep->current_secret_number != ep->last_secret_number)) { 2433 /* it's the old cookie */ 2434 (void)sctp_hmac_m(SCTP_HMAC, 2435 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2436 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2437 } else { 2438 /* it's the current cookie */ 2439 (void)sctp_hmac_m(SCTP_HMAC, 2440 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2441 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2442 } 2443 /* get the signature */ 2444 SCTP_INP_RUNLOCK(l_inp); 2445 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2446 if (sig == NULL) { 2447 /* couldn't find signature */ 2448 sctp_m_freem(m_sig); 2449 return (NULL); 2450 } 2451 /* compare the received digest with the computed digest */ 2452 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2453 /* try the old cookie? */ 2454 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2455 (ep->current_secret_number != ep->last_secret_number)) { 2456 /* compute digest with old */ 2457 (void)sctp_hmac_m(SCTP_HMAC, 2458 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2459 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2460 /* compare */ 2461 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2462 cookie_ok = 1; 2463 } 2464 } else { 2465 cookie_ok = 1; 2466 } 2467 2468 /* 2469 * Now before we continue we must reconstruct our mbuf so that 2470 * normal processing of any other chunks will work. 2471 */ 2472 { 2473 struct mbuf *m_at; 2474 2475 m_at = m; 2476 while (SCTP_BUF_NEXT(m_at) != NULL) { 2477 m_at = SCTP_BUF_NEXT(m_at); 2478 } 2479 SCTP_BUF_NEXT(m_at) = m_sig; 2480 } 2481 2482 if (cookie_ok == 0) { 2483 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2484 SCTPDBG(SCTP_DEBUG_INPUT2, 2485 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2486 (uint32_t) offset, cookie_offset, sig_offset); 2487 return (NULL); 2488 } 2489 /* 2490 * check the cookie timestamps to be sure it's not stale 2491 */ 2492 (void)SCTP_GETTIME_TIMEVAL(&now); 2493 /* Expire time is in Ticks, so we convert to seconds */ 2494 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2495 time_expires.tv_usec = cookie->time_entered.tv_usec; 2496 /* 2497 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2498 * is undefined. 2499 */ 2500 if (timevalcmp(&now, &time_expires, >)) { 2501 /* cookie is stale! */ 2502 struct mbuf *op_err; 2503 struct sctp_stale_cookie_msg *scm; 2504 uint32_t tim; 2505 2506 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2507 0, M_DONTWAIT, 1, MT_DATA); 2508 if (op_err == NULL) { 2509 /* FOOBAR */ 2510 return (NULL); 2511 } 2512 /* Set the len */ 2513 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2514 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2515 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2516 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2517 (sizeof(uint32_t)))); 2518 /* seconds to usec */ 2519 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2520 /* add in usec */ 2521 if (tim == 0) 2522 tim = now.tv_usec - cookie->time_entered.tv_usec; 2523 scm->time_usec = htonl(tim); 2524 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2525 vrf_id, port); 2526 return (NULL); 2527 } 2528 /* 2529 * Now we must see with the lookup address if we have an existing 2530 * asoc. This will only happen if we were in the COOKIE-WAIT state 2531 * and a INIT collided with us and somewhere the peer sent the 2532 * cookie on another address besides the single address our assoc 2533 * had for him. In this case we will have one of the tie-tags set at 2534 * least AND the address field in the cookie can be used to look it 2535 * up. 2536 */ 2537 to = NULL; 2538 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2539 memset(&sin6, 0, sizeof(sin6)); 2540 sin6.sin6_family = AF_INET6; 2541 sin6.sin6_len = sizeof(sin6); 2542 sin6.sin6_port = sh->src_port; 2543 sin6.sin6_scope_id = cookie->scope_id; 2544 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2545 sizeof(sin6.sin6_addr.s6_addr)); 2546 to = (struct sockaddr *)&sin6; 2547 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2548 memset(&sin, 0, sizeof(sin)); 2549 sin.sin_family = AF_INET; 2550 sin.sin_len = sizeof(sin); 2551 sin.sin_port = sh->src_port; 2552 sin.sin_addr.s_addr = cookie->address[0]; 2553 to = (struct sockaddr *)&sin; 2554 } else { 2555 /* This should not happen */ 2556 return (NULL); 2557 } 2558 if ((*stcb == NULL) && to) { 2559 /* Yep, lets check */ 2560 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2561 if (*stcb == NULL) { 2562 /* 2563 * We should have only got back the same inp. If we 2564 * got back a different ep we have a problem. The 2565 * original findep got back l_inp and now 2566 */ 2567 if (l_inp != *inp_p) { 2568 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2569 } 2570 } else { 2571 if (*locked_tcb == NULL) { 2572 /* 2573 * In this case we found the assoc only 2574 * after we locked the create lock. This 2575 * means we are in a colliding case and we 2576 * must make sure that we unlock the tcb if 2577 * its one of the cases where we throw away 2578 * the incoming packets. 2579 */ 2580 *locked_tcb = *stcb; 2581 2582 /* 2583 * We must also increment the inp ref count 2584 * since the ref_count flags was set when we 2585 * did not find the TCB, now we found it 2586 * which reduces the refcount.. we must 2587 * raise it back out to balance it all :-) 2588 */ 2589 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2590 if ((*stcb)->sctp_ep != l_inp) { 2591 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2592 (*stcb)->sctp_ep, l_inp); 2593 } 2594 } 2595 } 2596 } 2597 if (to == NULL) { 2598 return (NULL); 2599 } 2600 cookie_len -= SCTP_SIGNATURE_SIZE; 2601 if (*stcb == NULL) { 2602 /* this is the "normal" case... get a new TCB */ 2603 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2604 cookie_len, *inp_p, netp, to, ¬ification, 2605 auth_skipped, auth_offset, auth_len, vrf_id, port); 2606 } else { 2607 /* this is abnormal... cookie-echo on existing TCB */ 2608 had_a_existing_tcb = 1; 2609 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2610 cookie, cookie_len, *inp_p, *stcb, netp, to, 2611 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2612 } 2613 2614 if (*stcb == NULL) { 2615 /* still no TCB... must be bad cookie-echo */ 2616 return (NULL); 2617 } 2618 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2619 (*netp)->flowid = m->m_pkthdr.flowid; 2620 #ifdef INVARIANTS 2621 (*netp)->flowidset = 1; 2622 #endif 2623 } 2624 /* 2625 * Ok, we built an association so confirm the address we sent the 2626 * INIT-ACK to. 2627 */ 2628 netl = sctp_findnet(*stcb, to); 2629 /* 2630 * This code should in theory NOT run but 2631 */ 2632 if (netl == NULL) { 2633 /* TSNH! Huh, why do I need to add this address here? */ 2634 int ret; 2635 2636 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2637 SCTP_IN_COOKIE_PROC); 2638 netl = sctp_findnet(*stcb, to); 2639 } 2640 if (netl) { 2641 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2642 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2643 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2644 netl); 2645 send_int_conf = 1; 2646 } 2647 } 2648 if (*stcb) { 2649 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2650 *stcb, NULL); 2651 } 2652 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2653 if (!had_a_existing_tcb || 2654 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2655 /* 2656 * If we have a NEW cookie or the connect never 2657 * reached the connected state during collision we 2658 * must do the TCP accept thing. 2659 */ 2660 struct socket *so, *oso; 2661 struct sctp_inpcb *inp; 2662 2663 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2664 /* 2665 * For a restart we will keep the same 2666 * socket, no need to do anything. I THINK!! 2667 */ 2668 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2669 if (send_int_conf) { 2670 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2671 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2672 } 2673 return (m); 2674 } 2675 oso = (*inp_p)->sctp_socket; 2676 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2677 SCTP_TCB_UNLOCK((*stcb)); 2678 CURVNET_SET(oso->so_vnet); 2679 so = sonewconn(oso, 0 2680 ); 2681 CURVNET_RESTORE(); 2682 SCTP_TCB_LOCK((*stcb)); 2683 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2684 2685 if (so == NULL) { 2686 struct mbuf *op_err; 2687 2688 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2689 struct socket *pcb_so; 2690 2691 #endif 2692 /* Too many sockets */ 2693 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2694 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2695 sctp_abort_association(*inp_p, NULL, m, iphlen, 2696 sh, op_err, vrf_id, port); 2697 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2698 pcb_so = SCTP_INP_SO(*inp_p); 2699 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2700 SCTP_TCB_UNLOCK((*stcb)); 2701 SCTP_SOCKET_LOCK(pcb_so, 1); 2702 SCTP_TCB_LOCK((*stcb)); 2703 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2704 #endif 2705 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2706 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2707 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2708 #endif 2709 return (NULL); 2710 } 2711 inp = (struct sctp_inpcb *)so->so_pcb; 2712 SCTP_INP_INCR_REF(inp); 2713 /* 2714 * We add the unbound flag here so that if we get an 2715 * soabort() before we get the move_pcb done, we 2716 * will properly cleanup. 2717 */ 2718 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2719 SCTP_PCB_FLAGS_CONNECTED | 2720 SCTP_PCB_FLAGS_IN_TCPPOOL | 2721 SCTP_PCB_FLAGS_UNBOUND | 2722 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2723 SCTP_PCB_FLAGS_DONT_WAKE); 2724 inp->sctp_features = (*inp_p)->sctp_features; 2725 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2726 inp->sctp_socket = so; 2727 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2728 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2729 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2730 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2731 inp->sctp_context = (*inp_p)->sctp_context; 2732 inp->inp_starting_point_for_iterator = NULL; 2733 /* 2734 * copy in the authentication parameters from the 2735 * original endpoint 2736 */ 2737 if (inp->sctp_ep.local_hmacs) 2738 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2739 inp->sctp_ep.local_hmacs = 2740 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2741 if (inp->sctp_ep.local_auth_chunks) 2742 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2743 inp->sctp_ep.local_auth_chunks = 2744 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2745 2746 /* 2747 * Now we must move it from one hash table to 2748 * another and get the tcb in the right place. 2749 */ 2750 2751 /* 2752 * This is where the one-2-one socket is put into 2753 * the accept state waiting for the accept! 2754 */ 2755 if (*stcb) { 2756 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2757 } 2758 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2759 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 2763 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2764 0); 2765 SCTP_TCB_LOCK((*stcb)); 2766 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2767 2768 2769 /* 2770 * now we must check to see if we were aborted while 2771 * the move was going on and the lock/unlock 2772 * happened. 2773 */ 2774 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2775 /* 2776 * yep it was, we leave the assoc attached 2777 * to the socket since the sctp_inpcb_free() 2778 * call will send an abort for us. 2779 */ 2780 SCTP_INP_DECR_REF(inp); 2781 return (NULL); 2782 } 2783 SCTP_INP_DECR_REF(inp); 2784 /* Switch over to the new guy */ 2785 *inp_p = inp; 2786 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2787 if (send_int_conf) { 2788 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2789 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2790 } 2791 /* 2792 * Pull it from the incomplete queue and wake the 2793 * guy 2794 */ 2795 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2796 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2797 SCTP_TCB_UNLOCK((*stcb)); 2798 SCTP_SOCKET_LOCK(so, 1); 2799 #endif 2800 soisconnected(so); 2801 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2802 SCTP_TCB_LOCK((*stcb)); 2803 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2804 SCTP_SOCKET_UNLOCK(so, 1); 2805 #endif 2806 return (m); 2807 } 2808 } 2809 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2810 if (notification) { 2811 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2812 } 2813 if (send_int_conf) { 2814 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2815 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2816 } 2817 } 2818 return (m); 2819 } 2820 2821 static void 2822 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2823 struct sctp_tcb *stcb, struct sctp_nets *net) 2824 { 2825 /* cp must not be used, others call this without a c-ack :-) */ 2826 struct sctp_association *asoc; 2827 2828 SCTPDBG(SCTP_DEBUG_INPUT2, 2829 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2830 if (stcb == NULL) 2831 return; 2832 2833 asoc = &stcb->asoc; 2834 2835 sctp_stop_all_cookie_timers(stcb); 2836 /* process according to association state */ 2837 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2838 /* state change only needed when I am in right state */ 2839 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2840 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2841 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2842 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2843 stcb->sctp_ep, stcb, asoc->primary_destination); 2844 2845 } 2846 /* update RTO */ 2847 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2848 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2849 if (asoc->overall_error_count == 0) { 2850 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2851 &asoc->time_entered, sctp_align_safe_nocopy, 2852 SCTP_DETERMINE_LL_NOTOK); 2853 } 2854 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2855 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2856 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2857 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2858 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2859 struct socket *so; 2860 2861 #endif 2862 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2863 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2864 so = SCTP_INP_SO(stcb->sctp_ep); 2865 atomic_add_int(&stcb->asoc.refcnt, 1); 2866 SCTP_TCB_UNLOCK(stcb); 2867 SCTP_SOCKET_LOCK(so, 1); 2868 SCTP_TCB_LOCK(stcb); 2869 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2870 #endif 2871 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2872 soisconnected(stcb->sctp_socket); 2873 } 2874 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2875 SCTP_SOCKET_UNLOCK(so, 1); 2876 #endif 2877 } 2878 /* 2879 * since we did not send a HB make sure we don't double 2880 * things 2881 */ 2882 net->hb_responded = 1; 2883 2884 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2885 /* 2886 * We don't need to do the asconf thing, nor hb or 2887 * autoclose if the socket is closed. 2888 */ 2889 goto closed_socket; 2890 } 2891 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2892 stcb, net); 2893 2894 2895 if (stcb->asoc.sctp_autoclose_ticks && 2896 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2897 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2898 stcb->sctp_ep, stcb, NULL); 2899 } 2900 /* 2901 * send ASCONF if parameters are pending and ASCONFs are 2902 * allowed (eg. addresses changed when init/cookie echo were 2903 * in flight) 2904 */ 2905 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2906 (stcb->asoc.peer_supports_asconf) && 2907 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2908 #ifdef SCTP_TIMER_BASED_ASCONF 2909 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2910 stcb->sctp_ep, stcb, 2911 stcb->asoc.primary_destination); 2912 #else 2913 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2914 SCTP_ADDR_NOT_LOCKED); 2915 #endif 2916 } 2917 } 2918 closed_socket: 2919 /* Toss the cookie if I can */ 2920 sctp_toss_old_cookies(stcb, asoc); 2921 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2922 /* Restart the timer if we have pending data */ 2923 struct sctp_tmit_chunk *chk; 2924 2925 chk = TAILQ_FIRST(&asoc->sent_queue); 2926 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2927 } 2928 } 2929 2930 static void 2931 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2932 struct sctp_tcb *stcb) 2933 { 2934 struct sctp_nets *net; 2935 struct sctp_tmit_chunk *lchk; 2936 struct sctp_ecne_chunk bkup; 2937 uint8_t override_bit = 0; 2938 uint32_t tsn, window_data_tsn; 2939 int len; 2940 unsigned int pkt_cnt; 2941 2942 len = ntohs(cp->ch.chunk_length); 2943 if ((len != sizeof(struct sctp_ecne_chunk)) && 2944 (len != sizeof(struct old_sctp_ecne_chunk))) { 2945 return; 2946 } 2947 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2948 /* Its the old format */ 2949 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2950 bkup.num_pkts_since_cwr = htonl(1); 2951 cp = &bkup; 2952 } 2953 SCTP_STAT_INCR(sctps_recvecne); 2954 tsn = ntohl(cp->tsn); 2955 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2956 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2957 if (lchk == NULL) { 2958 window_data_tsn = stcb->asoc.sending_seq - 1; 2959 } else { 2960 window_data_tsn = lchk->rec.data.TSN_seq; 2961 } 2962 2963 /* Find where it was sent to if possible. */ 2964 net = NULL; 2965 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2966 if (lchk->rec.data.TSN_seq == tsn) { 2967 net = lchk->whoTo; 2968 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2969 break; 2970 } 2971 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 2972 break; 2973 } 2974 } 2975 if (net == NULL) { 2976 /* 2977 * What to do. A previous send of a CWR was possibly lost. 2978 * See how old it is, we may have it marked on the actual 2979 * net. 2980 */ 2981 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2982 if (tsn == net->last_cwr_tsn) { 2983 /* Found him, send it off */ 2984 goto out; 2985 } 2986 } 2987 /* 2988 * If we reach here, we need to send a special CWR that says 2989 * hey, we did this a long time ago and you lost the 2990 * response. 2991 */ 2992 net = TAILQ_FIRST(&stcb->asoc.nets); 2993 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2994 } 2995 out: 2996 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2997 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2998 /* 2999 * JRS - Use the congestion control given in the pluggable 3000 * CC module 3001 */ 3002 int ocwnd; 3003 3004 ocwnd = net->cwnd; 3005 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3006 /* 3007 * We reduce once every RTT. So we will only lower cwnd at 3008 * the next sending seq i.e. the window_data_tsn 3009 */ 3010 net->cwr_window_tsn = window_data_tsn; 3011 net->ecn_ce_pkt_cnt += pkt_cnt; 3012 net->lost_cnt = pkt_cnt; 3013 net->last_cwr_tsn = tsn; 3014 } else { 3015 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3016 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3017 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3018 /* 3019 * Another loss in the same window update how many 3020 * marks/packets lost we have had. 3021 */ 3022 int cnt = 1; 3023 3024 if (pkt_cnt > net->lost_cnt) { 3025 /* Should be the case */ 3026 cnt = (pkt_cnt - net->lost_cnt); 3027 net->ecn_ce_pkt_cnt += cnt; 3028 } 3029 net->lost_cnt = pkt_cnt; 3030 net->last_cwr_tsn = tsn; 3031 /* 3032 * Most CC functions will ignore this call, since we 3033 * are in-window yet of the initial CE the peer saw. 3034 */ 3035 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3036 } 3037 } 3038 /* 3039 * We always send a CWR this way if our previous one was lost our 3040 * peer will get an update, or if it is not time again to reduce we 3041 * still get the cwr to the peer. Note we set the override when we 3042 * could not find the TSN on the chunk or the destination network. 3043 */ 3044 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3045 } 3046 3047 static void 3048 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3049 { 3050 /* 3051 * Here we get a CWR from the peer. We must look in the outqueue and 3052 * make sure that we have a covered ECNE in teh control chunk part. 3053 * If so remove it. 3054 */ 3055 struct sctp_tmit_chunk *chk; 3056 struct sctp_ecne_chunk *ecne; 3057 int override; 3058 uint32_t cwr_tsn; 3059 3060 cwr_tsn = ntohl(cp->tsn); 3061 3062 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3063 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3064 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3065 continue; 3066 } 3067 if ((override == 0) && (chk->whoTo != net)) { 3068 /* Must be from the right src unless override is set */ 3069 continue; 3070 } 3071 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3072 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3073 /* this covers this ECNE, we can remove it */ 3074 stcb->asoc.ecn_echo_cnt_onq--; 3075 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3076 sctp_next); 3077 if (chk->data) { 3078 sctp_m_freem(chk->data); 3079 chk->data = NULL; 3080 } 3081 stcb->asoc.ctrl_queue_cnt--; 3082 sctp_free_a_chunk(stcb, chk); 3083 if (override == 0) { 3084 break; 3085 } 3086 } 3087 } 3088 } 3089 3090 static void 3091 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3092 struct sctp_tcb *stcb, struct sctp_nets *net) 3093 { 3094 struct sctp_association *asoc; 3095 3096 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3097 struct socket *so; 3098 3099 #endif 3100 3101 SCTPDBG(SCTP_DEBUG_INPUT2, 3102 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3103 if (stcb == NULL) 3104 return; 3105 3106 asoc = &stcb->asoc; 3107 /* process according to association state */ 3108 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3109 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3110 SCTPDBG(SCTP_DEBUG_INPUT2, 3111 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3112 SCTP_TCB_UNLOCK(stcb); 3113 return; 3114 } 3115 /* notify upper layer protocol */ 3116 if (stcb->sctp_socket) { 3117 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3118 /* are the queues empty? they should be */ 3119 if (!TAILQ_EMPTY(&asoc->send_queue) || 3120 !TAILQ_EMPTY(&asoc->sent_queue) || 3121 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3122 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3123 } 3124 } 3125 /* stop the timer */ 3126 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3127 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3128 /* free the TCB */ 3129 SCTPDBG(SCTP_DEBUG_INPUT2, 3130 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3131 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3132 so = SCTP_INP_SO(stcb->sctp_ep); 3133 atomic_add_int(&stcb->asoc.refcnt, 1); 3134 SCTP_TCB_UNLOCK(stcb); 3135 SCTP_SOCKET_LOCK(so, 1); 3136 SCTP_TCB_LOCK(stcb); 3137 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3138 #endif 3139 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3140 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3141 SCTP_SOCKET_UNLOCK(so, 1); 3142 #endif 3143 return; 3144 } 3145 3146 static int 3147 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3148 struct sctp_nets *net, uint8_t flg) 3149 { 3150 switch (desc->chunk_type) { 3151 case SCTP_DATA: 3152 /* find the tsn to resend (possibly */ 3153 { 3154 uint32_t tsn; 3155 struct sctp_tmit_chunk *tp1; 3156 3157 tsn = ntohl(desc->tsn_ifany); 3158 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3159 if (tp1->rec.data.TSN_seq == tsn) { 3160 /* found it */ 3161 break; 3162 } 3163 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3164 /* not found */ 3165 tp1 = NULL; 3166 break; 3167 } 3168 } 3169 if (tp1 == NULL) { 3170 /* 3171 * Do it the other way , aka without paying 3172 * attention to queue seq order. 3173 */ 3174 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3175 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3176 if (tp1->rec.data.TSN_seq == tsn) { 3177 /* found it */ 3178 break; 3179 } 3180 } 3181 } 3182 if (tp1 == NULL) { 3183 SCTP_STAT_INCR(sctps_pdrptsnnf); 3184 } 3185 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3186 uint8_t *ddp; 3187 3188 if (((flg & SCTP_BADCRC) == 0) && 3189 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3190 return (0); 3191 } 3192 if ((stcb->asoc.peers_rwnd == 0) && 3193 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3194 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3195 return (0); 3196 } 3197 if (stcb->asoc.peers_rwnd == 0 && 3198 (flg & SCTP_FROM_MIDDLE_BOX)) { 3199 SCTP_STAT_INCR(sctps_pdrpdizrw); 3200 return (0); 3201 } 3202 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3203 sizeof(struct sctp_data_chunk)); 3204 { 3205 unsigned int iii; 3206 3207 for (iii = 0; iii < sizeof(desc->data_bytes); 3208 iii++) { 3209 if (ddp[iii] != desc->data_bytes[iii]) { 3210 SCTP_STAT_INCR(sctps_pdrpbadd); 3211 return (-1); 3212 } 3213 } 3214 } 3215 3216 if (tp1->do_rtt) { 3217 /* 3218 * this guy had a RTO calculation 3219 * pending on it, cancel it 3220 */ 3221 tp1->do_rtt = 0; 3222 } 3223 SCTP_STAT_INCR(sctps_pdrpmark); 3224 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3225 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3226 /* 3227 * mark it as if we were doing a FR, since 3228 * we will be getting gap ack reports behind 3229 * the info from the router. 3230 */ 3231 tp1->rec.data.doing_fast_retransmit = 1; 3232 /* 3233 * mark the tsn with what sequences can 3234 * cause a new FR. 3235 */ 3236 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3237 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3238 } else { 3239 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3240 } 3241 3242 /* restart the timer */ 3243 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3244 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3245 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3246 stcb, tp1->whoTo); 3247 3248 /* fix counts and things */ 3249 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3250 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3251 tp1->whoTo->flight_size, 3252 tp1->book_size, 3253 (uintptr_t) stcb, 3254 tp1->rec.data.TSN_seq); 3255 } 3256 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3257 sctp_flight_size_decrease(tp1); 3258 sctp_total_flight_decrease(stcb, tp1); 3259 } 3260 tp1->sent = SCTP_DATAGRAM_RESEND; 3261 } { 3262 /* audit code */ 3263 unsigned int audit; 3264 3265 audit = 0; 3266 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3267 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3268 audit++; 3269 } 3270 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3271 sctp_next) { 3272 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3273 audit++; 3274 } 3275 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3276 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3277 audit, stcb->asoc.sent_queue_retran_cnt); 3278 #ifndef SCTP_AUDITING_ENABLED 3279 stcb->asoc.sent_queue_retran_cnt = audit; 3280 #endif 3281 } 3282 } 3283 } 3284 break; 3285 case SCTP_ASCONF: 3286 { 3287 struct sctp_tmit_chunk *asconf; 3288 3289 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3290 sctp_next) { 3291 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3292 break; 3293 } 3294 } 3295 if (asconf) { 3296 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3297 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3298 asconf->sent = SCTP_DATAGRAM_RESEND; 3299 asconf->snd_count--; 3300 } 3301 } 3302 break; 3303 case SCTP_INITIATION: 3304 /* resend the INIT */ 3305 stcb->asoc.dropped_special_cnt++; 3306 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3307 /* 3308 * If we can get it in, in a few attempts we do 3309 * this, otherwise we let the timer fire. 3310 */ 3311 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3312 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3313 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3314 } 3315 break; 3316 case SCTP_SELECTIVE_ACK: 3317 case SCTP_NR_SELECTIVE_ACK: 3318 /* resend the sack */ 3319 sctp_send_sack(stcb); 3320 break; 3321 case SCTP_HEARTBEAT_REQUEST: 3322 /* resend a demand HB */ 3323 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3324 /* 3325 * Only retransmit if we KNOW we wont destroy the 3326 * tcb 3327 */ 3328 (void)sctp_send_hb(stcb, 1, net); 3329 } 3330 break; 3331 case SCTP_SHUTDOWN: 3332 sctp_send_shutdown(stcb, net); 3333 break; 3334 case SCTP_SHUTDOWN_ACK: 3335 sctp_send_shutdown_ack(stcb, net); 3336 break; 3337 case SCTP_COOKIE_ECHO: 3338 { 3339 struct sctp_tmit_chunk *cookie; 3340 3341 cookie = NULL; 3342 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3343 sctp_next) { 3344 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3345 break; 3346 } 3347 } 3348 if (cookie) { 3349 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3350 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3351 cookie->sent = SCTP_DATAGRAM_RESEND; 3352 sctp_stop_all_cookie_timers(stcb); 3353 } 3354 } 3355 break; 3356 case SCTP_COOKIE_ACK: 3357 sctp_send_cookie_ack(stcb); 3358 break; 3359 case SCTP_ASCONF_ACK: 3360 /* resend last asconf ack */ 3361 sctp_send_asconf_ack(stcb); 3362 break; 3363 case SCTP_FORWARD_CUM_TSN: 3364 send_forward_tsn(stcb, &stcb->asoc); 3365 break; 3366 /* can't do anything with these */ 3367 case SCTP_PACKET_DROPPED: 3368 case SCTP_INITIATION_ACK: /* this should not happen */ 3369 case SCTP_HEARTBEAT_ACK: 3370 case SCTP_ABORT_ASSOCIATION: 3371 case SCTP_OPERATION_ERROR: 3372 case SCTP_SHUTDOWN_COMPLETE: 3373 case SCTP_ECN_ECHO: 3374 case SCTP_ECN_CWR: 3375 default: 3376 break; 3377 } 3378 return (0); 3379 } 3380 3381 void 3382 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3383 { 3384 int i; 3385 uint16_t temp; 3386 3387 /* 3388 * We set things to 0xffff since this is the last delivered sequence 3389 * and we will be sending in 0 after the reset. 3390 */ 3391 3392 if (number_entries) { 3393 for (i = 0; i < number_entries; i++) { 3394 temp = ntohs(list[i]); 3395 if (temp >= stcb->asoc.streamincnt) { 3396 continue; 3397 } 3398 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3399 } 3400 } else { 3401 list = NULL; 3402 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3403 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3404 } 3405 } 3406 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3407 } 3408 3409 static void 3410 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3411 { 3412 int i; 3413 3414 if (number_entries == 0) { 3415 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3416 stcb->asoc.strmout[i].next_sequence_sent = 0; 3417 } 3418 } else if (number_entries) { 3419 for (i = 0; i < number_entries; i++) { 3420 uint16_t temp; 3421 3422 temp = ntohs(list[i]); 3423 if (temp >= stcb->asoc.streamoutcnt) { 3424 /* no such stream */ 3425 continue; 3426 } 3427 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3428 } 3429 } 3430 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3431 } 3432 3433 3434 struct sctp_stream_reset_out_request * 3435 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3436 { 3437 struct sctp_association *asoc; 3438 struct sctp_stream_reset_out_req *req; 3439 struct sctp_stream_reset_out_request *r; 3440 struct sctp_tmit_chunk *chk; 3441 int len, clen; 3442 3443 asoc = &stcb->asoc; 3444 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3445 asoc->stream_reset_outstanding = 0; 3446 return (NULL); 3447 } 3448 if (stcb->asoc.str_reset == NULL) { 3449 asoc->stream_reset_outstanding = 0; 3450 return (NULL); 3451 } 3452 chk = stcb->asoc.str_reset; 3453 if (chk->data == NULL) { 3454 return (NULL); 3455 } 3456 if (bchk) { 3457 /* he wants a copy of the chk pointer */ 3458 *bchk = chk; 3459 } 3460 clen = chk->send_size; 3461 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3462 r = &req->sr_req; 3463 if (ntohl(r->request_seq) == seq) { 3464 /* found it */ 3465 return (r); 3466 } 3467 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3468 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3469 /* move to the next one, there can only be a max of two */ 3470 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3471 if (ntohl(r->request_seq) == seq) { 3472 return (r); 3473 } 3474 } 3475 /* that seq is not here */ 3476 return (NULL); 3477 } 3478 3479 static void 3480 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3481 { 3482 struct sctp_association *asoc; 3483 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3484 3485 if (stcb->asoc.str_reset == NULL) { 3486 return; 3487 } 3488 asoc = &stcb->asoc; 3489 3490 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3491 TAILQ_REMOVE(&asoc->control_send_queue, 3492 chk, 3493 sctp_next); 3494 if (chk->data) { 3495 sctp_m_freem(chk->data); 3496 chk->data = NULL; 3497 } 3498 asoc->ctrl_queue_cnt--; 3499 sctp_free_a_chunk(stcb, chk); 3500 /* sa_ignore NO_NULL_CHK */ 3501 stcb->asoc.str_reset = NULL; 3502 } 3503 3504 3505 static int 3506 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3507 uint32_t seq, uint32_t action, 3508 struct sctp_stream_reset_response *respin) 3509 { 3510 uint16_t type; 3511 int lparm_len; 3512 struct sctp_association *asoc = &stcb->asoc; 3513 struct sctp_tmit_chunk *chk; 3514 struct sctp_stream_reset_out_request *srparam; 3515 int number_entries; 3516 3517 if (asoc->stream_reset_outstanding == 0) { 3518 /* duplicate */ 3519 return (0); 3520 } 3521 if (seq == stcb->asoc.str_reset_seq_out) { 3522 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3523 if (srparam) { 3524 stcb->asoc.str_reset_seq_out++; 3525 type = ntohs(srparam->ph.param_type); 3526 lparm_len = ntohs(srparam->ph.param_length); 3527 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3528 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3529 asoc->stream_reset_out_is_outstanding = 0; 3530 if (asoc->stream_reset_outstanding) 3531 asoc->stream_reset_outstanding--; 3532 if (action == SCTP_STREAM_RESET_PERFORMED) { 3533 /* do it */ 3534 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3535 } else { 3536 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3537 } 3538 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3539 /* Answered my request */ 3540 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3541 if (asoc->stream_reset_outstanding) 3542 asoc->stream_reset_outstanding--; 3543 if (action != SCTP_STREAM_RESET_PERFORMED) { 3544 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3545 } 3546 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3547 /* Ok we now may have more streams */ 3548 if (asoc->stream_reset_outstanding) 3549 asoc->stream_reset_outstanding--; 3550 if (action == SCTP_STREAM_RESET_PERFORMED) { 3551 /* Put the new streams into effect */ 3552 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3553 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3554 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3555 } else { 3556 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3557 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3558 } 3559 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3560 /** 3561 * a) Adopt the new in tsn. 3562 * b) reset the map 3563 * c) Adopt the new out-tsn 3564 */ 3565 struct sctp_stream_reset_response_tsn *resp; 3566 struct sctp_forward_tsn_chunk fwdtsn; 3567 int abort_flag = 0; 3568 3569 if (respin == NULL) { 3570 /* huh ? */ 3571 return (0); 3572 } 3573 if (action == SCTP_STREAM_RESET_PERFORMED) { 3574 resp = (struct sctp_stream_reset_response_tsn *)respin; 3575 asoc->stream_reset_outstanding--; 3576 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3577 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3578 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3579 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3580 if (abort_flag) { 3581 return (1); 3582 } 3583 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3584 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3585 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3586 } 3587 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3588 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3589 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3590 3591 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3592 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3593 3594 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3595 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3596 3597 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3598 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3599 3600 } 3601 } 3602 /* get rid of the request and get the request flags */ 3603 if (asoc->stream_reset_outstanding == 0) { 3604 sctp_clean_up_stream_reset(stcb); 3605 } 3606 } 3607 } 3608 return (0); 3609 } 3610 3611 static void 3612 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3613 struct sctp_tmit_chunk *chk, 3614 struct sctp_stream_reset_in_request *req, int trunc) 3615 { 3616 uint32_t seq; 3617 int len, i; 3618 int number_entries; 3619 uint16_t temp; 3620 3621 /* 3622 * peer wants me to send a str-reset to him for my outgoing seq's if 3623 * seq_in is right. 3624 */ 3625 struct sctp_association *asoc = &stcb->asoc; 3626 3627 seq = ntohl(req->request_seq); 3628 if (asoc->str_reset_seq_in == seq) { 3629 if (trunc) { 3630 /* Can't do it, since they exceeded our buffer size */ 3631 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3632 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3633 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3634 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3635 len = ntohs(req->ph.param_length); 3636 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3637 for (i = 0; i < number_entries; i++) { 3638 temp = ntohs(req->list_of_streams[i]); 3639 req->list_of_streams[i] = temp; 3640 } 3641 /* move the reset action back one */ 3642 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3643 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3644 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3645 asoc->str_reset_seq_out, 3646 seq, (asoc->sending_seq - 1)); 3647 asoc->stream_reset_out_is_outstanding = 1; 3648 asoc->str_reset = chk; 3649 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3650 stcb->asoc.stream_reset_outstanding++; 3651 } else { 3652 /* Can't do it, since we have sent one out */ 3653 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3654 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3655 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3656 } 3657 asoc->str_reset_seq_in++; 3658 } else if (asoc->str_reset_seq_in - 1 == seq) { 3659 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3660 } else if (asoc->str_reset_seq_in - 2 == seq) { 3661 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3662 } else { 3663 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3664 } 3665 } 3666 3667 static int 3668 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3669 struct sctp_tmit_chunk *chk, 3670 struct sctp_stream_reset_tsn_request *req) 3671 { 3672 /* reset all in and out and update the tsn */ 3673 /* 3674 * A) reset my str-seq's on in and out. B) Select a receive next, 3675 * and set cum-ack to it. Also process this selected number as a 3676 * fwd-tsn as well. C) set in the response my next sending seq. 3677 */ 3678 struct sctp_forward_tsn_chunk fwdtsn; 3679 struct sctp_association *asoc = &stcb->asoc; 3680 int abort_flag = 0; 3681 uint32_t seq; 3682 3683 seq = ntohl(req->request_seq); 3684 if (asoc->str_reset_seq_in == seq) { 3685 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3686 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3687 fwdtsn.ch.chunk_flags = 0; 3688 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3689 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3690 if (abort_flag) { 3691 return (1); 3692 } 3693 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3694 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3695 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3696 } 3697 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3698 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3699 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3700 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3701 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3702 atomic_add_int(&stcb->asoc.sending_seq, 1); 3703 /* save off historical data for retrans */ 3704 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3705 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3706 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3707 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3708 3709 sctp_add_stream_reset_result_tsn(chk, 3710 ntohl(req->request_seq), 3711 SCTP_STREAM_RESET_PERFORMED, 3712 stcb->asoc.sending_seq, 3713 stcb->asoc.mapping_array_base_tsn); 3714 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3715 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3716 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3717 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3718 3719 asoc->str_reset_seq_in++; 3720 } else if (asoc->str_reset_seq_in - 1 == seq) { 3721 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3722 stcb->asoc.last_sending_seq[0], 3723 stcb->asoc.last_base_tsnsent[0] 3724 ); 3725 } else if (asoc->str_reset_seq_in - 2 == seq) { 3726 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3727 stcb->asoc.last_sending_seq[1], 3728 stcb->asoc.last_base_tsnsent[1] 3729 ); 3730 } else { 3731 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3732 } 3733 return (0); 3734 } 3735 3736 static void 3737 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3738 struct sctp_tmit_chunk *chk, 3739 struct sctp_stream_reset_out_request *req, int trunc) 3740 { 3741 uint32_t seq, tsn; 3742 int number_entries, len; 3743 struct sctp_association *asoc = &stcb->asoc; 3744 3745 seq = ntohl(req->request_seq); 3746 3747 /* now if its not a duplicate we process it */ 3748 if (asoc->str_reset_seq_in == seq) { 3749 len = ntohs(req->ph.param_length); 3750 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3751 /* 3752 * the sender is resetting, handle the list issue.. we must 3753 * a) verify if we can do the reset, if so no problem b) If 3754 * we can't do the reset we must copy the request. c) queue 3755 * it, and setup the data in processor to trigger it off 3756 * when needed and dequeue all the queued data. 3757 */ 3758 tsn = ntohl(req->send_reset_at_tsn); 3759 3760 /* move the reset action back one */ 3761 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3762 if (trunc) { 3763 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3764 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3765 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3766 /* we can do it now */ 3767 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3768 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3769 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3770 } else { 3771 /* 3772 * we must queue it up and thus wait for the TSN's 3773 * to arrive that are at or before tsn 3774 */ 3775 struct sctp_stream_reset_list *liste; 3776 int siz; 3777 3778 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3779 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3780 siz, SCTP_M_STRESET); 3781 if (liste == NULL) { 3782 /* gak out of memory */ 3783 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3784 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3785 return; 3786 } 3787 liste->tsn = tsn; 3788 liste->number_entries = number_entries; 3789 memcpy(&liste->req, req, 3790 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3791 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3792 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3793 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3794 } 3795 asoc->str_reset_seq_in++; 3796 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3797 /* 3798 * one seq back, just echo back last action since my 3799 * response was lost. 3800 */ 3801 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3802 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3803 /* 3804 * two seq back, just echo back last action since my 3805 * response was lost. 3806 */ 3807 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3808 } else { 3809 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3810 } 3811 } 3812 3813 static void 3814 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3815 struct sctp_stream_reset_add_strm *str_add) 3816 { 3817 /* 3818 * Peer is requesting to add more streams. If its within our 3819 * max-streams we will allow it. 3820 */ 3821 uint16_t num_stream, i; 3822 uint32_t seq; 3823 struct sctp_association *asoc = &stcb->asoc; 3824 struct sctp_queued_to_read *ctl, *nctl; 3825 3826 /* Get the number. */ 3827 seq = ntohl(str_add->request_seq); 3828 num_stream = ntohs(str_add->number_of_streams); 3829 /* Now what would be the new total? */ 3830 if (asoc->str_reset_seq_in == seq) { 3831 num_stream += stcb->asoc.streamincnt; 3832 if (num_stream > stcb->asoc.max_inbound_streams) { 3833 /* We must reject it they ask for to many */ 3834 denied: 3835 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3836 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3837 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3838 } else { 3839 /* Ok, we can do that :-) */ 3840 struct sctp_stream_in *oldstrm; 3841 3842 /* save off the old */ 3843 oldstrm = stcb->asoc.strmin; 3844 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3845 (num_stream * sizeof(struct sctp_stream_in)), 3846 SCTP_M_STRMI); 3847 if (stcb->asoc.strmin == NULL) { 3848 stcb->asoc.strmin = oldstrm; 3849 goto denied; 3850 } 3851 /* copy off the old data */ 3852 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3853 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3854 stcb->asoc.strmin[i].stream_no = i; 3855 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3856 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3857 /* now anything on those queues? */ 3858 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3859 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3860 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3861 } 3862 } 3863 /* Init the new streams */ 3864 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3865 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3866 stcb->asoc.strmin[i].stream_no = i; 3867 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3868 stcb->asoc.strmin[i].delivery_started = 0; 3869 } 3870 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3871 /* update the size */ 3872 stcb->asoc.streamincnt = num_stream; 3873 /* Send the ack */ 3874 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3875 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3876 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3877 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3878 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3879 } 3880 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3881 /* 3882 * one seq back, just echo back last action since my 3883 * response was lost. 3884 */ 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3886 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3887 /* 3888 * two seq back, just echo back last action since my 3889 * response was lost. 3890 */ 3891 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3892 } else { 3893 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3894 3895 } 3896 } 3897 3898 #ifdef __GNUC__ 3899 __attribute__((noinline)) 3900 #endif 3901 static int 3902 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3903 struct sctp_stream_reset_out_req *sr_req) 3904 { 3905 int chk_length, param_len, ptype; 3906 struct sctp_paramhdr pstore; 3907 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3908 3909 uint32_t seq; 3910 int num_req = 0; 3911 int trunc = 0; 3912 struct sctp_tmit_chunk *chk; 3913 struct sctp_chunkhdr *ch; 3914 struct sctp_paramhdr *ph; 3915 int ret_code = 0; 3916 int num_param = 0; 3917 3918 /* now it may be a reset or a reset-response */ 3919 chk_length = ntohs(sr_req->ch.chunk_length); 3920 3921 /* setup for adding the response */ 3922 sctp_alloc_a_chunk(stcb, chk); 3923 if (chk == NULL) { 3924 return (ret_code); 3925 } 3926 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3927 chk->rec.chunk_id.can_take_data = 0; 3928 chk->asoc = &stcb->asoc; 3929 chk->no_fr_allowed = 0; 3930 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3931 chk->book_size_scale = 0; 3932 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3933 if (chk->data == NULL) { 3934 strres_nochunk: 3935 if (chk->data) { 3936 sctp_m_freem(chk->data); 3937 chk->data = NULL; 3938 } 3939 sctp_free_a_chunk(stcb, chk); 3940 return (ret_code); 3941 } 3942 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3943 3944 /* setup chunk parameters */ 3945 chk->sent = SCTP_DATAGRAM_UNSENT; 3946 chk->snd_count = 0; 3947 chk->whoTo = stcb->asoc.primary_destination; 3948 atomic_add_int(&chk->whoTo->ref_count, 1); 3949 3950 ch = mtod(chk->data, struct sctp_chunkhdr *); 3951 ch->chunk_type = SCTP_STREAM_RESET; 3952 ch->chunk_flags = 0; 3953 ch->chunk_length = htons(chk->send_size); 3954 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3955 offset += sizeof(struct sctp_chunkhdr); 3956 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3957 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3958 if (ph == NULL) 3959 break; 3960 param_len = ntohs(ph->param_length); 3961 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3962 /* bad param */ 3963 break; 3964 } 3965 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3966 (uint8_t *) & cstore); 3967 ptype = ntohs(ph->param_type); 3968 num_param++; 3969 if (param_len > (int)sizeof(cstore)) { 3970 trunc = 1; 3971 } else { 3972 trunc = 0; 3973 } 3974 3975 if (num_param > SCTP_MAX_RESET_PARAMS) { 3976 /* hit the max of parameters already sorry.. */ 3977 break; 3978 } 3979 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3980 struct sctp_stream_reset_out_request *req_out; 3981 3982 req_out = (struct sctp_stream_reset_out_request *)ph; 3983 num_req++; 3984 if (stcb->asoc.stream_reset_outstanding) { 3985 seq = ntohl(req_out->response_seq); 3986 if (seq == stcb->asoc.str_reset_seq_out) { 3987 /* implicit ack */ 3988 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3989 } 3990 } 3991 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3992 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3993 struct sctp_stream_reset_add_strm *str_add; 3994 3995 str_add = (struct sctp_stream_reset_add_strm *)ph; 3996 num_req++; 3997 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3998 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3999 struct sctp_stream_reset_in_request *req_in; 4000 4001 num_req++; 4002 4003 req_in = (struct sctp_stream_reset_in_request *)ph; 4004 4005 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4006 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4007 struct sctp_stream_reset_tsn_request *req_tsn; 4008 4009 num_req++; 4010 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4011 4012 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4013 ret_code = 1; 4014 goto strres_nochunk; 4015 } 4016 /* no more */ 4017 break; 4018 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4019 struct sctp_stream_reset_response *resp; 4020 uint32_t result; 4021 4022 resp = (struct sctp_stream_reset_response *)ph; 4023 seq = ntohl(resp->response_seq); 4024 result = ntohl(resp->result); 4025 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4026 ret_code = 1; 4027 goto strres_nochunk; 4028 } 4029 } else { 4030 break; 4031 } 4032 offset += SCTP_SIZE32(param_len); 4033 chk_length -= SCTP_SIZE32(param_len); 4034 } 4035 if (num_req == 0) { 4036 /* we have no response free the stuff */ 4037 goto strres_nochunk; 4038 } 4039 /* ok we have a chunk to link in */ 4040 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4041 chk, 4042 sctp_next); 4043 stcb->asoc.ctrl_queue_cnt++; 4044 return (ret_code); 4045 } 4046 4047 /* 4048 * Handle a router or endpoints report of a packet loss, there are two ways 4049 * to handle this, either we get the whole packet and must disect it 4050 * ourselves (possibly with truncation and or corruption) or it is a summary 4051 * from a middle box that did the disectting for us. 4052 */ 4053 static void 4054 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4055 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4056 { 4057 uint32_t bottle_bw, on_queue; 4058 uint16_t trunc_len; 4059 unsigned int chlen; 4060 unsigned int at; 4061 struct sctp_chunk_desc desc; 4062 struct sctp_chunkhdr *ch; 4063 4064 chlen = ntohs(cp->ch.chunk_length); 4065 chlen -= sizeof(struct sctp_pktdrop_chunk); 4066 /* XXX possible chlen underflow */ 4067 if (chlen == 0) { 4068 ch = NULL; 4069 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4070 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4071 } else { 4072 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4073 chlen -= sizeof(struct sctphdr); 4074 /* XXX possible chlen underflow */ 4075 memset(&desc, 0, sizeof(desc)); 4076 } 4077 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4078 if (trunc_len > limit) { 4079 trunc_len = limit; 4080 } 4081 /* now the chunks themselves */ 4082 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4083 desc.chunk_type = ch->chunk_type; 4084 /* get amount we need to move */ 4085 at = ntohs(ch->chunk_length); 4086 if (at < sizeof(struct sctp_chunkhdr)) { 4087 /* corrupt chunk, maybe at the end? */ 4088 SCTP_STAT_INCR(sctps_pdrpcrupt); 4089 break; 4090 } 4091 if (trunc_len == 0) { 4092 /* we are supposed to have all of it */ 4093 if (at > chlen) { 4094 /* corrupt skip it */ 4095 SCTP_STAT_INCR(sctps_pdrpcrupt); 4096 break; 4097 } 4098 } else { 4099 /* is there enough of it left ? */ 4100 if (desc.chunk_type == SCTP_DATA) { 4101 if (chlen < (sizeof(struct sctp_data_chunk) + 4102 sizeof(desc.data_bytes))) { 4103 break; 4104 } 4105 } else { 4106 if (chlen < sizeof(struct sctp_chunkhdr)) { 4107 break; 4108 } 4109 } 4110 } 4111 if (desc.chunk_type == SCTP_DATA) { 4112 /* can we get out the tsn? */ 4113 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4114 SCTP_STAT_INCR(sctps_pdrpmbda); 4115 4116 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4117 /* yep */ 4118 struct sctp_data_chunk *dcp; 4119 uint8_t *ddp; 4120 unsigned int iii; 4121 4122 dcp = (struct sctp_data_chunk *)ch; 4123 ddp = (uint8_t *) (dcp + 1); 4124 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4125 desc.data_bytes[iii] = ddp[iii]; 4126 } 4127 desc.tsn_ifany = dcp->dp.tsn; 4128 } else { 4129 /* nope we are done. */ 4130 SCTP_STAT_INCR(sctps_pdrpnedat); 4131 break; 4132 } 4133 } else { 4134 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4135 SCTP_STAT_INCR(sctps_pdrpmbct); 4136 } 4137 4138 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4139 SCTP_STAT_INCR(sctps_pdrppdbrk); 4140 break; 4141 } 4142 if (SCTP_SIZE32(at) > chlen) { 4143 break; 4144 } 4145 chlen -= SCTP_SIZE32(at); 4146 if (chlen < sizeof(struct sctp_chunkhdr)) { 4147 /* done, none left */ 4148 break; 4149 } 4150 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4151 } 4152 /* Now update any rwnd --- possibly */ 4153 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4154 /* From a peer, we get a rwnd report */ 4155 uint32_t a_rwnd; 4156 4157 SCTP_STAT_INCR(sctps_pdrpfehos); 4158 4159 bottle_bw = ntohl(cp->bottle_bw); 4160 on_queue = ntohl(cp->current_onq); 4161 if (bottle_bw && on_queue) { 4162 /* a rwnd report is in here */ 4163 if (bottle_bw > on_queue) 4164 a_rwnd = bottle_bw - on_queue; 4165 else 4166 a_rwnd = 0; 4167 4168 if (a_rwnd == 0) 4169 stcb->asoc.peers_rwnd = 0; 4170 else { 4171 if (a_rwnd > stcb->asoc.total_flight) { 4172 stcb->asoc.peers_rwnd = 4173 a_rwnd - stcb->asoc.total_flight; 4174 } else { 4175 stcb->asoc.peers_rwnd = 0; 4176 } 4177 if (stcb->asoc.peers_rwnd < 4178 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4179 /* SWS sender side engages */ 4180 stcb->asoc.peers_rwnd = 0; 4181 } 4182 } 4183 } 4184 } else { 4185 SCTP_STAT_INCR(sctps_pdrpfmbox); 4186 } 4187 4188 /* now middle boxes in sat networks get a cwnd bump */ 4189 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4190 (stcb->asoc.sat_t3_loss_recovery == 0) && 4191 (stcb->asoc.sat_network)) { 4192 /* 4193 * This is debateable but for sat networks it makes sense 4194 * Note if a T3 timer has went off, we will prohibit any 4195 * changes to cwnd until we exit the t3 loss recovery. 4196 */ 4197 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4198 net, cp, &bottle_bw, &on_queue); 4199 } 4200 } 4201 4202 /* 4203 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4204 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4205 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4206 * length of the complete packet outputs: - length: modified to remaining 4207 * length after control processing - netp: modified to new sctp_nets after 4208 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4209 * bad packet,...) otherwise return the tcb for this packet 4210 */ 4211 #ifdef __GNUC__ 4212 __attribute__((noinline)) 4213 #endif 4214 static struct sctp_tcb * 4215 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4216 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4217 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4218 uint32_t vrf_id, uint16_t port) 4219 { 4220 struct sctp_association *asoc; 4221 uint32_t vtag_in; 4222 int num_chunks = 0; /* number of control chunks processed */ 4223 uint32_t chk_length; 4224 int ret; 4225 int abort_no_unlock = 0; 4226 int ecne_seen = 0; 4227 4228 /* 4229 * How big should this be, and should it be alloc'd? Lets try the 4230 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4231 * until we get into jumbo grams and such.. 4232 */ 4233 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4234 struct sctp_tcb *locked_tcb = stcb; 4235 int got_auth = 0; 4236 uint32_t auth_offset = 0, auth_len = 0; 4237 int auth_skipped = 0; 4238 int asconf_cnt = 0; 4239 4240 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4241 struct socket *so; 4242 4243 #endif 4244 4245 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4246 iphlen, *offset, length, stcb); 4247 4248 /* validate chunk header length... */ 4249 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4250 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4251 ntohs(ch->chunk_length)); 4252 if (locked_tcb) { 4253 SCTP_TCB_UNLOCK(locked_tcb); 4254 } 4255 return (NULL); 4256 } 4257 /* 4258 * validate the verification tag 4259 */ 4260 vtag_in = ntohl(sh->v_tag); 4261 4262 if (locked_tcb) { 4263 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4264 } 4265 if (ch->chunk_type == SCTP_INITIATION) { 4266 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4267 ntohs(ch->chunk_length), vtag_in); 4268 if (vtag_in != 0) { 4269 /* protocol error- silently discard... */ 4270 SCTP_STAT_INCR(sctps_badvtag); 4271 if (locked_tcb) { 4272 SCTP_TCB_UNLOCK(locked_tcb); 4273 } 4274 return (NULL); 4275 } 4276 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4277 /* 4278 * If there is no stcb, skip the AUTH chunk and process 4279 * later after a stcb is found (to validate the lookup was 4280 * valid. 4281 */ 4282 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4283 (stcb == NULL) && 4284 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4285 /* save this chunk for later processing */ 4286 auth_skipped = 1; 4287 auth_offset = *offset; 4288 auth_len = ntohs(ch->chunk_length); 4289 4290 /* (temporarily) move past this chunk */ 4291 *offset += SCTP_SIZE32(auth_len); 4292 if (*offset >= length) { 4293 /* no more data left in the mbuf chain */ 4294 *offset = length; 4295 if (locked_tcb) { 4296 SCTP_TCB_UNLOCK(locked_tcb); 4297 } 4298 return (NULL); 4299 } 4300 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4301 sizeof(struct sctp_chunkhdr), chunk_buf); 4302 } 4303 if (ch == NULL) { 4304 /* Help */ 4305 *offset = length; 4306 if (locked_tcb) { 4307 SCTP_TCB_UNLOCK(locked_tcb); 4308 } 4309 return (NULL); 4310 } 4311 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4312 goto process_control_chunks; 4313 } 4314 /* 4315 * first check if it's an ASCONF with an unknown src addr we 4316 * need to look inside to find the association 4317 */ 4318 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4319 struct sctp_chunkhdr *asconf_ch = ch; 4320 uint32_t asconf_offset = 0, asconf_len = 0; 4321 4322 /* inp's refcount may be reduced */ 4323 SCTP_INP_INCR_REF(inp); 4324 4325 asconf_offset = *offset; 4326 do { 4327 asconf_len = ntohs(asconf_ch->chunk_length); 4328 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4329 break; 4330 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4331 *offset, sh, &inp, netp, vrf_id); 4332 if (stcb != NULL) 4333 break; 4334 asconf_offset += SCTP_SIZE32(asconf_len); 4335 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4336 sizeof(struct sctp_chunkhdr), chunk_buf); 4337 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4338 if (stcb == NULL) { 4339 /* 4340 * reduce inp's refcount if not reduced in 4341 * sctp_findassociation_ep_asconf(). 4342 */ 4343 SCTP_INP_DECR_REF(inp); 4344 } else { 4345 locked_tcb = stcb; 4346 } 4347 4348 /* now go back and verify any auth chunk to be sure */ 4349 if (auth_skipped && (stcb != NULL)) { 4350 struct sctp_auth_chunk *auth; 4351 4352 auth = (struct sctp_auth_chunk *) 4353 sctp_m_getptr(m, auth_offset, 4354 auth_len, chunk_buf); 4355 got_auth = 1; 4356 auth_skipped = 0; 4357 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4358 auth_offset)) { 4359 /* auth HMAC failed so dump it */ 4360 *offset = length; 4361 if (locked_tcb) { 4362 SCTP_TCB_UNLOCK(locked_tcb); 4363 } 4364 return (NULL); 4365 } else { 4366 /* remaining chunks are HMAC checked */ 4367 stcb->asoc.authenticated = 1; 4368 } 4369 } 4370 } 4371 if (stcb == NULL) { 4372 /* no association, so it's out of the blue... */ 4373 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4374 vrf_id, port); 4375 *offset = length; 4376 if (locked_tcb) { 4377 SCTP_TCB_UNLOCK(locked_tcb); 4378 } 4379 return (NULL); 4380 } 4381 asoc = &stcb->asoc; 4382 /* ABORT and SHUTDOWN can use either v_tag... */ 4383 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4384 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4385 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4386 if ((vtag_in == asoc->my_vtag) || 4387 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4388 (vtag_in == asoc->peer_vtag))) { 4389 /* this is valid */ 4390 } else { 4391 /* drop this packet... */ 4392 SCTP_STAT_INCR(sctps_badvtag); 4393 if (locked_tcb) { 4394 SCTP_TCB_UNLOCK(locked_tcb); 4395 } 4396 return (NULL); 4397 } 4398 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4399 if (vtag_in != asoc->my_vtag) { 4400 /* 4401 * this could be a stale SHUTDOWN-ACK or the 4402 * peer never got the SHUTDOWN-COMPLETE and 4403 * is still hung; we have started a new asoc 4404 * but it won't complete until the shutdown 4405 * is completed 4406 */ 4407 if (locked_tcb) { 4408 SCTP_TCB_UNLOCK(locked_tcb); 4409 } 4410 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4411 NULL, vrf_id, port); 4412 return (NULL); 4413 } 4414 } else { 4415 /* for all other chunks, vtag must match */ 4416 if (vtag_in != asoc->my_vtag) { 4417 /* invalid vtag... */ 4418 SCTPDBG(SCTP_DEBUG_INPUT3, 4419 "invalid vtag: %xh, expect %xh\n", 4420 vtag_in, asoc->my_vtag); 4421 SCTP_STAT_INCR(sctps_badvtag); 4422 if (locked_tcb) { 4423 SCTP_TCB_UNLOCK(locked_tcb); 4424 } 4425 *offset = length; 4426 return (NULL); 4427 } 4428 } 4429 } /* end if !SCTP_COOKIE_ECHO */ 4430 /* 4431 * process all control chunks... 4432 */ 4433 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4434 /* EY */ 4435 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4436 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4437 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4438 /* implied cookie-ack.. we must have lost the ack */ 4439 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4440 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4441 stcb->asoc.overall_error_count, 4442 0, 4443 SCTP_FROM_SCTP_INPUT, 4444 __LINE__); 4445 } 4446 stcb->asoc.overall_error_count = 0; 4447 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4448 *netp); 4449 } 4450 process_control_chunks: 4451 while (IS_SCTP_CONTROL(ch)) { 4452 /* validate chunk length */ 4453 chk_length = ntohs(ch->chunk_length); 4454 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4455 ch->chunk_type, chk_length); 4456 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4457 if (chk_length < sizeof(*ch) || 4458 (*offset + (int)chk_length) > length) { 4459 *offset = length; 4460 if (locked_tcb) { 4461 SCTP_TCB_UNLOCK(locked_tcb); 4462 } 4463 return (NULL); 4464 } 4465 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4466 /* 4467 * INIT-ACK only gets the init ack "header" portion only 4468 * because we don't have to process the peer's COOKIE. All 4469 * others get a complete chunk. 4470 */ 4471 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4472 (ch->chunk_type == SCTP_INITIATION)) { 4473 /* get an init-ack chunk */ 4474 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4475 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4476 if (ch == NULL) { 4477 *offset = length; 4478 if (locked_tcb) { 4479 SCTP_TCB_UNLOCK(locked_tcb); 4480 } 4481 return (NULL); 4482 } 4483 } else { 4484 /* For cookies and all other chunks. */ 4485 if (chk_length > sizeof(chunk_buf)) { 4486 /* 4487 * use just the size of the chunk buffer so 4488 * the front part of our chunks fit in 4489 * contiguous space up to the chunk buffer 4490 * size (508 bytes). For chunks that need to 4491 * get more than that they must use the 4492 * sctp_m_getptr() function or other means 4493 * (e.g. know how to parse mbuf chains). 4494 * Cookies do this already. 4495 */ 4496 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4497 (sizeof(chunk_buf) - 4), 4498 chunk_buf); 4499 if (ch == NULL) { 4500 *offset = length; 4501 if (locked_tcb) { 4502 SCTP_TCB_UNLOCK(locked_tcb); 4503 } 4504 return (NULL); 4505 } 4506 } else { 4507 /* We can fit it all */ 4508 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4509 chk_length, chunk_buf); 4510 if (ch == NULL) { 4511 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4512 *offset = length; 4513 if (locked_tcb) { 4514 SCTP_TCB_UNLOCK(locked_tcb); 4515 } 4516 return (NULL); 4517 } 4518 } 4519 } 4520 num_chunks++; 4521 /* Save off the last place we got a control from */ 4522 if (stcb != NULL) { 4523 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4524 /* 4525 * allow last_control to be NULL if 4526 * ASCONF... ASCONF processing will find the 4527 * right net later 4528 */ 4529 if ((netp != NULL) && (*netp != NULL)) 4530 stcb->asoc.last_control_chunk_from = *netp; 4531 } 4532 } 4533 #ifdef SCTP_AUDITING_ENABLED 4534 sctp_audit_log(0xB0, ch->chunk_type); 4535 #endif 4536 4537 /* check to see if this chunk required auth, but isn't */ 4538 if ((stcb != NULL) && 4539 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4540 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4541 !stcb->asoc.authenticated) { 4542 /* "silently" ignore */ 4543 SCTP_STAT_INCR(sctps_recvauthmissing); 4544 goto next_chunk; 4545 } 4546 switch (ch->chunk_type) { 4547 case SCTP_INITIATION: 4548 /* must be first and only chunk */ 4549 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4550 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4551 /* We are not interested anymore? */ 4552 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4553 /* 4554 * collision case where we are 4555 * sending to them too 4556 */ 4557 ; 4558 } else { 4559 if (locked_tcb) { 4560 SCTP_TCB_UNLOCK(locked_tcb); 4561 } 4562 *offset = length; 4563 return (NULL); 4564 } 4565 } 4566 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4567 (num_chunks > 1) || 4568 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4569 *offset = length; 4570 if (locked_tcb) { 4571 SCTP_TCB_UNLOCK(locked_tcb); 4572 } 4573 return (NULL); 4574 } 4575 if ((stcb != NULL) && 4576 (SCTP_GET_STATE(&stcb->asoc) == 4577 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4578 sctp_send_shutdown_ack(stcb, 4579 stcb->asoc.primary_destination); 4580 *offset = length; 4581 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4582 if (locked_tcb) { 4583 SCTP_TCB_UNLOCK(locked_tcb); 4584 } 4585 return (NULL); 4586 } 4587 if (netp) { 4588 sctp_handle_init(m, iphlen, *offset, sh, 4589 (struct sctp_init_chunk *)ch, inp, 4590 stcb, *netp, &abort_no_unlock, vrf_id, port); 4591 } 4592 if (abort_no_unlock) 4593 return (NULL); 4594 4595 *offset = length; 4596 if (locked_tcb) { 4597 SCTP_TCB_UNLOCK(locked_tcb); 4598 } 4599 return (NULL); 4600 break; 4601 case SCTP_PAD_CHUNK: 4602 break; 4603 case SCTP_INITIATION_ACK: 4604 /* must be first and only chunk */ 4605 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4606 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4607 /* We are not interested anymore */ 4608 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4609 ; 4610 } else { 4611 if (locked_tcb != stcb) { 4612 /* Very unlikely */ 4613 SCTP_TCB_UNLOCK(locked_tcb); 4614 } 4615 *offset = length; 4616 if (stcb) { 4617 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4618 so = SCTP_INP_SO(inp); 4619 atomic_add_int(&stcb->asoc.refcnt, 1); 4620 SCTP_TCB_UNLOCK(stcb); 4621 SCTP_SOCKET_LOCK(so, 1); 4622 SCTP_TCB_LOCK(stcb); 4623 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4624 #endif 4625 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4626 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4627 SCTP_SOCKET_UNLOCK(so, 1); 4628 #endif 4629 } 4630 return (NULL); 4631 } 4632 } 4633 if ((num_chunks > 1) || 4634 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4635 *offset = length; 4636 if (locked_tcb) { 4637 SCTP_TCB_UNLOCK(locked_tcb); 4638 } 4639 return (NULL); 4640 } 4641 if ((netp) && (*netp)) { 4642 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4643 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4644 } else { 4645 ret = -1; 4646 } 4647 /* 4648 * Special case, I must call the output routine to 4649 * get the cookie echoed 4650 */ 4651 if (abort_no_unlock) 4652 return (NULL); 4653 4654 if ((stcb) && ret == 0) 4655 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4656 *offset = length; 4657 if (locked_tcb) { 4658 SCTP_TCB_UNLOCK(locked_tcb); 4659 } 4660 return (NULL); 4661 break; 4662 case SCTP_SELECTIVE_ACK: 4663 { 4664 struct sctp_sack_chunk *sack; 4665 int abort_now = 0; 4666 uint32_t a_rwnd, cum_ack; 4667 uint16_t num_seg, num_dup; 4668 uint8_t flags; 4669 int offset_seg, offset_dup; 4670 4671 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4672 SCTP_STAT_INCR(sctps_recvsacks); 4673 if (stcb == NULL) { 4674 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4675 break; 4676 } 4677 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4678 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4679 break; 4680 } 4681 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4682 /*- 4683 * If we have sent a shutdown-ack, we will pay no 4684 * attention to a sack sent in to us since 4685 * we don't care anymore. 4686 */ 4687 break; 4688 } 4689 sack = (struct sctp_sack_chunk *)ch; 4690 flags = ch->chunk_flags; 4691 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4692 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4693 num_dup = ntohs(sack->sack.num_dup_tsns); 4694 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4695 if (sizeof(struct sctp_sack_chunk) + 4696 num_seg * sizeof(struct sctp_gap_ack_block) + 4697 num_dup * sizeof(uint32_t) != chk_length) { 4698 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4699 break; 4700 } 4701 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4702 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4703 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4704 cum_ack, num_seg, a_rwnd); 4705 stcb->asoc.seen_a_sack_this_pkt = 1; 4706 if ((stcb->asoc.pr_sctp_cnt == 0) && 4707 (num_seg == 0) && 4708 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4709 (stcb->asoc.saw_sack_with_frags == 0) && 4710 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4711 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4712 ) { 4713 /* 4714 * We have a SIMPLE sack having no 4715 * prior segments and data on sent 4716 * queue to be acked.. Use the 4717 * faster path sack processing. We 4718 * also allow window update sacks 4719 * with no missing segments to go 4720 * this way too. 4721 */ 4722 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4723 } else { 4724 if (netp && *netp) 4725 sctp_handle_sack(m, offset_seg, offset_dup, 4726 stcb, *netp, 4727 num_seg, 0, num_dup, &abort_now, flags, 4728 cum_ack, a_rwnd, ecne_seen); 4729 } 4730 if (abort_now) { 4731 /* ABORT signal from sack processing */ 4732 *offset = length; 4733 return (NULL); 4734 } 4735 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4736 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4737 (stcb->asoc.stream_queue_cnt == 0)) { 4738 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4739 } 4740 } 4741 break; 4742 /* 4743 * EY - nr_sack: If the received chunk is an 4744 * nr_sack chunk 4745 */ 4746 case SCTP_NR_SELECTIVE_ACK: 4747 { 4748 struct sctp_nr_sack_chunk *nr_sack; 4749 int abort_now = 0; 4750 uint32_t a_rwnd, cum_ack; 4751 uint16_t num_seg, num_nr_seg, num_dup; 4752 uint8_t flags; 4753 int offset_seg, offset_dup; 4754 4755 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4756 SCTP_STAT_INCR(sctps_recvsacks); 4757 if (stcb == NULL) { 4758 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4759 break; 4760 } 4761 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4762 (stcb->asoc.peer_supports_nr_sack == 0)) { 4763 goto unknown_chunk; 4764 } 4765 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4766 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4767 break; 4768 } 4769 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4770 /*- 4771 * If we have sent a shutdown-ack, we will pay no 4772 * attention to a sack sent in to us since 4773 * we don't care anymore. 4774 */ 4775 break; 4776 } 4777 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4778 flags = ch->chunk_flags; 4779 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4780 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4781 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4782 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4783 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4784 if (sizeof(struct sctp_nr_sack_chunk) + 4785 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4786 num_dup * sizeof(uint32_t) != chk_length) { 4787 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4788 break; 4789 } 4790 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4791 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4792 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4793 cum_ack, num_seg, a_rwnd); 4794 stcb->asoc.seen_a_sack_this_pkt = 1; 4795 if ((stcb->asoc.pr_sctp_cnt == 0) && 4796 (num_seg == 0) && (num_nr_seg == 0) && 4797 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4798 (stcb->asoc.saw_sack_with_frags == 0) && 4799 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4800 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4801 /* 4802 * We have a SIMPLE sack having no 4803 * prior segments and data on sent 4804 * queue to be acked. Use the faster 4805 * path sack processing. We also 4806 * allow window update sacks with no 4807 * missing segments to go this way 4808 * too. 4809 */ 4810 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4811 &abort_now, ecne_seen); 4812 } else { 4813 if (netp && *netp) 4814 sctp_handle_sack(m, offset_seg, offset_dup, 4815 stcb, *netp, 4816 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4817 cum_ack, a_rwnd, ecne_seen); 4818 } 4819 if (abort_now) { 4820 /* ABORT signal from sack processing */ 4821 *offset = length; 4822 return (NULL); 4823 } 4824 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4825 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4826 (stcb->asoc.stream_queue_cnt == 0)) { 4827 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4828 } 4829 } 4830 break; 4831 4832 case SCTP_HEARTBEAT_REQUEST: 4833 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4834 if ((stcb) && netp && *netp) { 4835 SCTP_STAT_INCR(sctps_recvheartbeat); 4836 sctp_send_heartbeat_ack(stcb, m, *offset, 4837 chk_length, *netp); 4838 4839 /* He's alive so give him credit */ 4840 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4841 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4842 stcb->asoc.overall_error_count, 4843 0, 4844 SCTP_FROM_SCTP_INPUT, 4845 __LINE__); 4846 } 4847 stcb->asoc.overall_error_count = 0; 4848 } 4849 break; 4850 case SCTP_HEARTBEAT_ACK: 4851 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4852 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4853 /* Its not ours */ 4854 *offset = length; 4855 if (locked_tcb) { 4856 SCTP_TCB_UNLOCK(locked_tcb); 4857 } 4858 return (NULL); 4859 } 4860 /* He's alive so give him credit */ 4861 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4862 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4863 stcb->asoc.overall_error_count, 4864 0, 4865 SCTP_FROM_SCTP_INPUT, 4866 __LINE__); 4867 } 4868 stcb->asoc.overall_error_count = 0; 4869 SCTP_STAT_INCR(sctps_recvheartbeatack); 4870 if (netp && *netp) 4871 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4872 stcb, *netp); 4873 break; 4874 case SCTP_ABORT_ASSOCIATION: 4875 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4876 stcb); 4877 if ((stcb) && netp && *netp) 4878 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4879 stcb, *netp); 4880 *offset = length; 4881 return (NULL); 4882 break; 4883 case SCTP_SHUTDOWN: 4884 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4885 stcb); 4886 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4887 *offset = length; 4888 if (locked_tcb) { 4889 SCTP_TCB_UNLOCK(locked_tcb); 4890 } 4891 return (NULL); 4892 } 4893 if (netp && *netp) { 4894 int abort_flag = 0; 4895 4896 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4897 stcb, *netp, &abort_flag); 4898 if (abort_flag) { 4899 *offset = length; 4900 return (NULL); 4901 } 4902 } 4903 break; 4904 case SCTP_SHUTDOWN_ACK: 4905 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4906 if ((stcb) && (netp) && (*netp)) 4907 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4908 *offset = length; 4909 return (NULL); 4910 break; 4911 4912 case SCTP_OPERATION_ERROR: 4913 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4914 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4915 4916 *offset = length; 4917 return (NULL); 4918 } 4919 break; 4920 case SCTP_COOKIE_ECHO: 4921 SCTPDBG(SCTP_DEBUG_INPUT3, 4922 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4923 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4924 ; 4925 } else { 4926 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4927 /* We are not interested anymore */ 4928 abend: 4929 if (stcb) { 4930 SCTP_TCB_UNLOCK(stcb); 4931 } 4932 *offset = length; 4933 return (NULL); 4934 } 4935 } 4936 /* 4937 * First are we accepting? We do this again here 4938 * since it is possible that a previous endpoint WAS 4939 * listening responded to a INIT-ACK and then 4940 * closed. We opened and bound.. and are now no 4941 * longer listening. 4942 */ 4943 4944 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4945 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4946 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4947 struct mbuf *oper; 4948 struct sctp_paramhdr *phdr; 4949 4950 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4951 0, M_DONTWAIT, 1, MT_DATA); 4952 if (oper) { 4953 SCTP_BUF_LEN(oper) = 4954 sizeof(struct sctp_paramhdr); 4955 phdr = mtod(oper, 4956 struct sctp_paramhdr *); 4957 phdr->param_type = 4958 htons(SCTP_CAUSE_OUT_OF_RESC); 4959 phdr->param_length = 4960 htons(sizeof(struct sctp_paramhdr)); 4961 } 4962 sctp_abort_association(inp, stcb, m, 4963 iphlen, sh, oper, vrf_id, port); 4964 } 4965 *offset = length; 4966 return (NULL); 4967 } else { 4968 struct mbuf *ret_buf; 4969 struct sctp_inpcb *linp; 4970 4971 if (stcb) { 4972 linp = NULL; 4973 } else { 4974 linp = inp; 4975 } 4976 4977 if (linp) { 4978 SCTP_ASOC_CREATE_LOCK(linp); 4979 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4980 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4981 SCTP_ASOC_CREATE_UNLOCK(linp); 4982 goto abend; 4983 } 4984 } 4985 if (netp) { 4986 ret_buf = 4987 sctp_handle_cookie_echo(m, iphlen, 4988 *offset, sh, 4989 (struct sctp_cookie_echo_chunk *)ch, 4990 &inp, &stcb, netp, 4991 auth_skipped, 4992 auth_offset, 4993 auth_len, 4994 &locked_tcb, 4995 vrf_id, 4996 port); 4997 } else { 4998 ret_buf = NULL; 4999 } 5000 if (linp) { 5001 SCTP_ASOC_CREATE_UNLOCK(linp); 5002 } 5003 if (ret_buf == NULL) { 5004 if (locked_tcb) { 5005 SCTP_TCB_UNLOCK(locked_tcb); 5006 } 5007 SCTPDBG(SCTP_DEBUG_INPUT3, 5008 "GAK, null buffer\n"); 5009 auth_skipped = 0; 5010 *offset = length; 5011 return (NULL); 5012 } 5013 /* if AUTH skipped, see if it verified... */ 5014 if (auth_skipped) { 5015 got_auth = 1; 5016 auth_skipped = 0; 5017 } 5018 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5019 /* 5020 * Restart the timer if we have 5021 * pending data 5022 */ 5023 struct sctp_tmit_chunk *chk; 5024 5025 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5026 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5027 } 5028 } 5029 break; 5030 case SCTP_COOKIE_ACK: 5031 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5032 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5033 if (locked_tcb) { 5034 SCTP_TCB_UNLOCK(locked_tcb); 5035 } 5036 return (NULL); 5037 } 5038 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5039 /* We are not interested anymore */ 5040 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5041 ; 5042 } else if (stcb) { 5043 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5044 so = SCTP_INP_SO(inp); 5045 atomic_add_int(&stcb->asoc.refcnt, 1); 5046 SCTP_TCB_UNLOCK(stcb); 5047 SCTP_SOCKET_LOCK(so, 1); 5048 SCTP_TCB_LOCK(stcb); 5049 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5050 #endif 5051 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5052 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5053 SCTP_SOCKET_UNLOCK(so, 1); 5054 #endif 5055 *offset = length; 5056 return (NULL); 5057 } 5058 } 5059 /* He's alive so give him credit */ 5060 if ((stcb) && netp && *netp) { 5061 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5062 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5063 stcb->asoc.overall_error_count, 5064 0, 5065 SCTP_FROM_SCTP_INPUT, 5066 __LINE__); 5067 } 5068 stcb->asoc.overall_error_count = 0; 5069 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5070 } 5071 break; 5072 case SCTP_ECN_ECHO: 5073 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5074 /* He's alive so give him credit */ 5075 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5076 /* Its not ours */ 5077 if (locked_tcb) { 5078 SCTP_TCB_UNLOCK(locked_tcb); 5079 } 5080 *offset = length; 5081 return (NULL); 5082 } 5083 if (stcb) { 5084 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5085 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5086 stcb->asoc.overall_error_count, 5087 0, 5088 SCTP_FROM_SCTP_INPUT, 5089 __LINE__); 5090 } 5091 stcb->asoc.overall_error_count = 0; 5092 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5093 stcb); 5094 ecne_seen = 1; 5095 } 5096 break; 5097 case SCTP_ECN_CWR: 5098 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5099 /* He's alive so give him credit */ 5100 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5101 /* Its not ours */ 5102 if (locked_tcb) { 5103 SCTP_TCB_UNLOCK(locked_tcb); 5104 } 5105 *offset = length; 5106 return (NULL); 5107 } 5108 if (stcb) { 5109 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5110 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5111 stcb->asoc.overall_error_count, 5112 0, 5113 SCTP_FROM_SCTP_INPUT, 5114 __LINE__); 5115 } 5116 stcb->asoc.overall_error_count = 0; 5117 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5118 } 5119 break; 5120 case SCTP_SHUTDOWN_COMPLETE: 5121 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5122 /* must be first and only chunk */ 5123 if ((num_chunks > 1) || 5124 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5125 *offset = length; 5126 if (locked_tcb) { 5127 SCTP_TCB_UNLOCK(locked_tcb); 5128 } 5129 return (NULL); 5130 } 5131 if ((stcb) && netp && *netp) { 5132 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5133 stcb, *netp); 5134 } 5135 *offset = length; 5136 return (NULL); 5137 break; 5138 case SCTP_ASCONF: 5139 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5140 /* He's alive so give him credit */ 5141 if (stcb) { 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 stcb->asoc.overall_error_count = 0; 5150 sctp_handle_asconf(m, *offset, 5151 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5152 asconf_cnt++; 5153 } 5154 break; 5155 case SCTP_ASCONF_ACK: 5156 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5157 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5158 /* Its not ours */ 5159 if (locked_tcb) { 5160 SCTP_TCB_UNLOCK(locked_tcb); 5161 } 5162 *offset = length; 5163 return (NULL); 5164 } 5165 if ((stcb) && netp && *netp) { 5166 /* He's alive so give him credit */ 5167 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5168 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5169 stcb->asoc.overall_error_count, 5170 0, 5171 SCTP_FROM_SCTP_INPUT, 5172 __LINE__); 5173 } 5174 stcb->asoc.overall_error_count = 0; 5175 sctp_handle_asconf_ack(m, *offset, 5176 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5177 if (abort_no_unlock) 5178 return (NULL); 5179 } 5180 break; 5181 case SCTP_FORWARD_CUM_TSN: 5182 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5183 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5184 /* Its not ours */ 5185 if (locked_tcb) { 5186 SCTP_TCB_UNLOCK(locked_tcb); 5187 } 5188 *offset = length; 5189 return (NULL); 5190 } 5191 /* He's alive so give him credit */ 5192 if (stcb) { 5193 int abort_flag = 0; 5194 5195 stcb->asoc.overall_error_count = 0; 5196 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5197 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5198 stcb->asoc.overall_error_count, 5199 0, 5200 SCTP_FROM_SCTP_INPUT, 5201 __LINE__); 5202 } 5203 *fwd_tsn_seen = 1; 5204 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5205 /* We are not interested anymore */ 5206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5207 so = SCTP_INP_SO(inp); 5208 atomic_add_int(&stcb->asoc.refcnt, 1); 5209 SCTP_TCB_UNLOCK(stcb); 5210 SCTP_SOCKET_LOCK(so, 1); 5211 SCTP_TCB_LOCK(stcb); 5212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5213 #endif 5214 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5215 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5216 SCTP_SOCKET_UNLOCK(so, 1); 5217 #endif 5218 *offset = length; 5219 return (NULL); 5220 } 5221 sctp_handle_forward_tsn(stcb, 5222 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5223 if (abort_flag) { 5224 *offset = length; 5225 return (NULL); 5226 } else { 5227 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5228 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5229 stcb->asoc.overall_error_count, 5230 0, 5231 SCTP_FROM_SCTP_INPUT, 5232 __LINE__); 5233 } 5234 stcb->asoc.overall_error_count = 0; 5235 } 5236 5237 } 5238 break; 5239 case SCTP_STREAM_RESET: 5240 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5241 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5242 /* Its not ours */ 5243 if (locked_tcb) { 5244 SCTP_TCB_UNLOCK(locked_tcb); 5245 } 5246 *offset = length; 5247 return (NULL); 5248 } 5249 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5250 /* We are not interested anymore */ 5251 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5252 so = SCTP_INP_SO(inp); 5253 atomic_add_int(&stcb->asoc.refcnt, 1); 5254 SCTP_TCB_UNLOCK(stcb); 5255 SCTP_SOCKET_LOCK(so, 1); 5256 SCTP_TCB_LOCK(stcb); 5257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5258 #endif 5259 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5260 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5261 SCTP_SOCKET_UNLOCK(so, 1); 5262 #endif 5263 *offset = length; 5264 return (NULL); 5265 } 5266 if (stcb->asoc.peer_supports_strreset == 0) { 5267 /* 5268 * hmm, peer should have announced this, but 5269 * we will turn it on since he is sending us 5270 * a stream reset. 5271 */ 5272 stcb->asoc.peer_supports_strreset = 1; 5273 } 5274 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5275 /* stop processing */ 5276 *offset = length; 5277 return (NULL); 5278 } 5279 break; 5280 case SCTP_PACKET_DROPPED: 5281 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5282 /* re-get it all please */ 5283 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5284 /* Its not ours */ 5285 if (locked_tcb) { 5286 SCTP_TCB_UNLOCK(locked_tcb); 5287 } 5288 *offset = length; 5289 return (NULL); 5290 } 5291 if (ch && (stcb) && netp && (*netp)) { 5292 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5293 stcb, *netp, 5294 min(chk_length, (sizeof(chunk_buf) - 4))); 5295 5296 } 5297 break; 5298 5299 case SCTP_AUTHENTICATION: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5301 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5302 goto unknown_chunk; 5303 5304 if (stcb == NULL) { 5305 /* save the first AUTH for later processing */ 5306 if (auth_skipped == 0) { 5307 auth_offset = *offset; 5308 auth_len = chk_length; 5309 auth_skipped = 1; 5310 } 5311 /* skip this chunk (temporarily) */ 5312 goto next_chunk; 5313 } 5314 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5315 (chk_length > (sizeof(struct sctp_auth_chunk) + 5316 SCTP_AUTH_DIGEST_LEN_MAX))) { 5317 /* Its not ours */ 5318 if (locked_tcb) { 5319 SCTP_TCB_UNLOCK(locked_tcb); 5320 } 5321 *offset = length; 5322 return (NULL); 5323 } 5324 if (got_auth == 1) { 5325 /* skip this chunk... it's already auth'd */ 5326 goto next_chunk; 5327 } 5328 got_auth = 1; 5329 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5330 m, *offset)) { 5331 /* auth HMAC failed so dump the packet */ 5332 *offset = length; 5333 return (stcb); 5334 } else { 5335 /* remaining chunks are HMAC checked */ 5336 stcb->asoc.authenticated = 1; 5337 } 5338 break; 5339 5340 default: 5341 unknown_chunk: 5342 /* it's an unknown chunk! */ 5343 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5344 struct mbuf *mm; 5345 struct sctp_paramhdr *phd; 5346 5347 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5348 0, M_DONTWAIT, 1, MT_DATA); 5349 if (mm) { 5350 phd = mtod(mm, struct sctp_paramhdr *); 5351 /* 5352 * We cheat and use param type since 5353 * we did not bother to define a 5354 * error cause struct. They are the 5355 * same basic format with different 5356 * names. 5357 */ 5358 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5359 phd->param_length = htons(chk_length + sizeof(*phd)); 5360 SCTP_BUF_LEN(mm) = sizeof(*phd); 5361 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5362 M_DONTWAIT); 5363 if (SCTP_BUF_NEXT(mm)) { 5364 #ifdef SCTP_MBUF_LOGGING 5365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5366 struct mbuf *mat; 5367 5368 mat = SCTP_BUF_NEXT(mm); 5369 while (mat) { 5370 if (SCTP_BUF_IS_EXTENDED(mat)) { 5371 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5372 } 5373 mat = SCTP_BUF_NEXT(mat); 5374 } 5375 } 5376 #endif 5377 sctp_queue_op_err(stcb, mm); 5378 } else { 5379 sctp_m_freem(mm); 5380 } 5381 } 5382 } 5383 if ((ch->chunk_type & 0x80) == 0) { 5384 /* discard this packet */ 5385 *offset = length; 5386 return (stcb); 5387 } /* else skip this bad chunk and continue... */ 5388 break; 5389 } /* switch (ch->chunk_type) */ 5390 5391 5392 next_chunk: 5393 /* get the next chunk */ 5394 *offset += SCTP_SIZE32(chk_length); 5395 if (*offset >= length) { 5396 /* no more data left in the mbuf chain */ 5397 break; 5398 } 5399 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5400 sizeof(struct sctp_chunkhdr), chunk_buf); 5401 if (ch == NULL) { 5402 if (locked_tcb) { 5403 SCTP_TCB_UNLOCK(locked_tcb); 5404 } 5405 *offset = length; 5406 return (NULL); 5407 } 5408 } /* while */ 5409 5410 if (asconf_cnt > 0 && stcb != NULL) { 5411 sctp_send_asconf_ack(stcb); 5412 } 5413 return (stcb); 5414 } 5415 5416 5417 #ifdef INVARIANTS 5418 #ifdef __GNUC__ 5419 __attribute__((noinline)) 5420 #endif 5421 void 5422 sctp_validate_no_locks(struct sctp_inpcb *inp) 5423 { 5424 struct sctp_tcb *lstcb; 5425 5426 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5427 if (mtx_owned(&lstcb->tcb_mtx)) { 5428 panic("Own lock on stcb at return from input"); 5429 } 5430 } 5431 if (mtx_owned(&inp->inp_create_mtx)) { 5432 panic("Own create lock on inp"); 5433 } 5434 if (mtx_owned(&inp->inp_mtx)) { 5435 panic("Own inp lock on inp"); 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 int cnt_ctrl_ready = 0; 5459 5460 SCTP_STAT_INCR(sctps_recvdatagrams); 5461 #ifdef SCTP_AUDITING_ENABLED 5462 sctp_audit_log(0xE0, 1); 5463 sctp_auditing(0, inp, stcb, net); 5464 #endif 5465 5466 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5467 m, iphlen, offset, length, stcb); 5468 if (stcb) { 5469 /* always clear this before beginning a packet */ 5470 stcb->asoc.authenticated = 0; 5471 stcb->asoc.seen_a_sack_this_pkt = 0; 5472 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5473 stcb, stcb->asoc.state); 5474 5475 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5476 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5477 /*- 5478 * If we hit here, we had a ref count 5479 * up when the assoc was aborted and the 5480 * timer is clearing out the assoc, we should 5481 * NOT respond to any packet.. its OOTB. 5482 */ 5483 SCTP_TCB_UNLOCK(stcb); 5484 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5485 vrf_id, port); 5486 goto out_now; 5487 } 5488 } 5489 if (IS_SCTP_CONTROL(ch)) { 5490 /* process the control portion of the SCTP packet */ 5491 /* sa_ignore NO_NULL_CHK */ 5492 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5493 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5494 if (stcb) { 5495 /* 5496 * This covers us if the cookie-echo was there and 5497 * it changes our INP. 5498 */ 5499 inp = stcb->sctp_ep; 5500 if ((net) && (port)) { 5501 if (net->port == 0) { 5502 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5503 } 5504 net->port = port; 5505 } 5506 } 5507 } else { 5508 /* 5509 * no control chunks, so pre-process DATA chunks (these 5510 * checks are taken care of by control processing) 5511 */ 5512 5513 /* 5514 * if DATA only packet, and auth is required, then punt... 5515 * can't have authenticated without any AUTH (control) 5516 * chunks 5517 */ 5518 if ((stcb != NULL) && 5519 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5520 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5521 /* "silently" ignore */ 5522 SCTP_STAT_INCR(sctps_recvauthmissing); 5523 SCTP_TCB_UNLOCK(stcb); 5524 goto out_now; 5525 } 5526 if (stcb == NULL) { 5527 /* out of the blue DATA chunk */ 5528 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5529 vrf_id, port); 5530 goto out_now; 5531 } 5532 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5533 /* v_tag mismatch! */ 5534 SCTP_STAT_INCR(sctps_badvtag); 5535 SCTP_TCB_UNLOCK(stcb); 5536 goto out_now; 5537 } 5538 } 5539 5540 if (stcb == NULL) { 5541 /* 5542 * no valid TCB for this packet, or we found it's a bad 5543 * packet while processing control, or we're done with this 5544 * packet (done or skip rest of data), so we drop it... 5545 */ 5546 goto out_now; 5547 } 5548 /* 5549 * DATA chunk processing 5550 */ 5551 /* plow through the data chunks while length > offset */ 5552 5553 /* 5554 * Rest should be DATA only. Check authentication state if AUTH for 5555 * DATA is required. 5556 */ 5557 if ((length > offset) && 5558 (stcb != NULL) && 5559 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5560 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5561 !stcb->asoc.authenticated) { 5562 /* "silently" ignore */ 5563 SCTP_STAT_INCR(sctps_recvauthmissing); 5564 SCTPDBG(SCTP_DEBUG_AUTH1, 5565 "Data chunk requires AUTH, skipped\n"); 5566 goto trigger_send; 5567 } 5568 if (length > offset) { 5569 int retval; 5570 5571 /* 5572 * First check to make sure our state is correct. We would 5573 * not get here unless we really did have a tag, so we don't 5574 * abort if this happens, just dump the chunk silently. 5575 */ 5576 switch (SCTP_GET_STATE(&stcb->asoc)) { 5577 case SCTP_STATE_COOKIE_ECHOED: 5578 /* 5579 * we consider data with valid tags in this state 5580 * shows us the cookie-ack was lost. Imply it was 5581 * there. 5582 */ 5583 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5584 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5585 stcb->asoc.overall_error_count, 5586 0, 5587 SCTP_FROM_SCTP_INPUT, 5588 __LINE__); 5589 } 5590 stcb->asoc.overall_error_count = 0; 5591 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5592 break; 5593 case SCTP_STATE_COOKIE_WAIT: 5594 /* 5595 * We consider OOTB any data sent during asoc setup. 5596 */ 5597 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5598 vrf_id, port); 5599 SCTP_TCB_UNLOCK(stcb); 5600 goto out_now; 5601 /* sa_ignore NOTREACHED */ 5602 break; 5603 case SCTP_STATE_EMPTY: /* should not happen */ 5604 case SCTP_STATE_INUSE: /* should not happen */ 5605 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5606 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5607 default: 5608 SCTP_TCB_UNLOCK(stcb); 5609 goto out_now; 5610 /* sa_ignore NOTREACHED */ 5611 break; 5612 case SCTP_STATE_OPEN: 5613 case SCTP_STATE_SHUTDOWN_SENT: 5614 break; 5615 } 5616 /* plow through the data chunks while length > offset */ 5617 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5618 inp, stcb, net, &high_tsn); 5619 if (retval == 2) { 5620 /* 5621 * The association aborted, NO UNLOCK needed since 5622 * the association is destroyed. 5623 */ 5624 goto out_now; 5625 } 5626 data_processed = 1; 5627 /* 5628 * Anything important needs to have been m_copy'ed in 5629 * process_data 5630 */ 5631 } 5632 /* take care of ecn */ 5633 if ((stcb->asoc.ecn_allowed == 1) && 5634 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5635 /* Yep, we need to add a ECNE */ 5636 sctp_send_ecn_echo(stcb, net, high_tsn); 5637 } 5638 if ((data_processed == 0) && (fwd_tsn_seen)) { 5639 int was_a_gap; 5640 uint32_t highest_tsn; 5641 5642 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5643 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5644 } else { 5645 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5646 } 5647 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5648 stcb->asoc.send_sack = 1; 5649 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5650 if (abort_flag) { 5651 /* Again, we aborted so NO UNLOCK needed */ 5652 goto out_now; 5653 } 5654 } else if (fwd_tsn_seen) { 5655 stcb->asoc.send_sack = 1; 5656 } 5657 /* trigger send of any chunks in queue... */ 5658 trigger_send: 5659 #ifdef SCTP_AUDITING_ENABLED 5660 sctp_audit_log(0xE0, 2); 5661 sctp_auditing(1, inp, stcb, net); 5662 #endif 5663 SCTPDBG(SCTP_DEBUG_INPUT1, 5664 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5665 stcb->asoc.peers_rwnd, 5666 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5667 stcb->asoc.total_flight); 5668 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5669 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5670 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5671 } 5672 if (cnt_ctrl_ready || 5673 ((un_sent) && 5674 (stcb->asoc.peers_rwnd > 0 || 5675 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5676 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5677 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5678 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5679 } 5680 #ifdef SCTP_AUDITING_ENABLED 5681 sctp_audit_log(0xE0, 3); 5682 sctp_auditing(2, inp, stcb, net); 5683 #endif 5684 SCTP_TCB_UNLOCK(stcb); 5685 out_now: 5686 #ifdef INVARIANTS 5687 sctp_validate_no_locks(inp); 5688 #endif 5689 return; 5690 } 5691 5692 #if 0 5693 static void 5694 sctp_print_mbuf_chain(struct mbuf *m) 5695 { 5696 for (; m; m = SCTP_BUF_NEXT(m)) { 5697 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5698 if (SCTP_BUF_IS_EXTENDED(m)) 5699 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5700 } 5701 } 5702 5703 #endif 5704 5705 void 5706 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5707 { 5708 #ifdef SCTP_MBUF_LOGGING 5709 struct mbuf *mat; 5710 5711 #endif 5712 struct mbuf *m; 5713 int iphlen; 5714 uint32_t vrf_id = 0; 5715 uint8_t ecn_bits; 5716 struct ip *ip; 5717 struct sctphdr *sh; 5718 struct sctp_inpcb *inp = NULL; 5719 struct sctp_nets *net; 5720 struct sctp_tcb *stcb = NULL; 5721 struct sctp_chunkhdr *ch; 5722 int refcount_up = 0; 5723 int length, mlen, offset; 5724 5725 #if !defined(SCTP_WITH_NO_CSUM) 5726 uint32_t check, calc_check; 5727 5728 #endif 5729 5730 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5731 SCTP_RELEASE_PKT(i_pak); 5732 return; 5733 } 5734 mlen = SCTP_HEADER_LEN(i_pak); 5735 iphlen = off; 5736 m = SCTP_HEADER_TO_CHAIN(i_pak); 5737 5738 net = NULL; 5739 SCTP_STAT_INCR(sctps_recvpackets); 5740 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5741 5742 5743 #ifdef SCTP_MBUF_LOGGING 5744 /* Log in any input mbufs */ 5745 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5746 mat = m; 5747 while (mat) { 5748 if (SCTP_BUF_IS_EXTENDED(mat)) { 5749 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5750 } 5751 mat = SCTP_BUF_NEXT(mat); 5752 } 5753 } 5754 #endif 5755 #ifdef SCTP_PACKET_LOGGING 5756 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5757 sctp_packet_log(m, mlen); 5758 #endif 5759 /* 5760 * Must take out the iphlen, since mlen expects this (only effect lb 5761 * case) 5762 */ 5763 mlen -= iphlen; 5764 5765 /* 5766 * Get IP, SCTP, and first chunk header together in first mbuf. 5767 */ 5768 ip = mtod(m, struct ip *); 5769 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5770 if (SCTP_BUF_LEN(m) < offset) { 5771 if ((m = m_pullup(m, offset)) == 0) { 5772 SCTP_STAT_INCR(sctps_hdrops); 5773 return; 5774 } 5775 ip = mtod(m, struct ip *); 5776 } 5777 /* validate mbuf chain length with IP payload length */ 5778 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5779 SCTP_STAT_INCR(sctps_hdrops); 5780 goto bad; 5781 } 5782 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5783 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5784 SCTPDBG(SCTP_DEBUG_INPUT1, 5785 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5786 5787 /* SCTP does not allow broadcasts or multicasts */ 5788 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5789 goto bad; 5790 } 5791 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5792 /* 5793 * We only look at broadcast if its a front state, All 5794 * others we will not have a tcb for anyway. 5795 */ 5796 goto bad; 5797 } 5798 /* validate SCTP checksum */ 5799 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5800 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5801 m->m_pkthdr.len, 5802 if_name(m->m_pkthdr.rcvif), 5803 m->m_pkthdr.csum_flags); 5804 #if defined(SCTP_WITH_NO_CSUM) 5805 SCTP_STAT_INCR(sctps_recvnocrc); 5806 #else 5807 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5808 SCTP_STAT_INCR(sctps_recvhwcrc); 5809 goto sctp_skip_csum_4; 5810 } 5811 check = sh->checksum; /* save incoming checksum */ 5812 sh->checksum = 0; /* prepare for calc */ 5813 calc_check = sctp_calculate_cksum(m, iphlen); 5814 sh->checksum = check; 5815 SCTP_STAT_INCR(sctps_recvswcrc); 5816 if (calc_check != check) { 5817 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5818 calc_check, check, m, mlen, iphlen); 5819 5820 stcb = sctp_findassociation_addr(m, iphlen, 5821 offset - sizeof(*ch), 5822 sh, ch, &inp, &net, 5823 vrf_id); 5824 if ((net) && (port)) { 5825 if (net->port == 0) { 5826 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5827 } 5828 net->port = port; 5829 } 5830 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5831 net->flowid = m->m_pkthdr.flowid; 5832 #ifdef INVARIANTS 5833 net->flowidset = 1; 5834 #endif 5835 } 5836 if ((inp) && (stcb)) { 5837 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5838 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5839 } else if ((inp != NULL) && (stcb == NULL)) { 5840 refcount_up = 1; 5841 } 5842 SCTP_STAT_INCR(sctps_badsum); 5843 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5844 goto bad; 5845 } 5846 sctp_skip_csum_4: 5847 #endif 5848 /* destination port of 0 is illegal, based on RFC2960. */ 5849 if (sh->dest_port == 0) { 5850 SCTP_STAT_INCR(sctps_hdrops); 5851 goto bad; 5852 } 5853 /* 5854 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5855 * IP/SCTP/first chunk header... 5856 */ 5857 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5858 sh, ch, &inp, &net, vrf_id); 5859 if ((net) && (port)) { 5860 if (net->port == 0) { 5861 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5862 } 5863 net->port = port; 5864 } 5865 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5866 net->flowid = m->m_pkthdr.flowid; 5867 #ifdef INVARIANTS 5868 net->flowidset = 1; 5869 #endif 5870 } 5871 /* inp's ref-count increased && stcb locked */ 5872 if (inp == NULL) { 5873 struct sctp_init_chunk *init_chk, chunk_buf; 5874 5875 SCTP_STAT_INCR(sctps_noport); 5876 #ifdef ICMP_BANDLIM 5877 /* 5878 * we use the bandwidth limiting to protect against sending 5879 * too many ABORTS all at once. In this case these count the 5880 * same as an ICMP message. 5881 */ 5882 if (badport_bandlim(0) < 0) 5883 goto bad; 5884 #endif /* ICMP_BANDLIM */ 5885 SCTPDBG(SCTP_DEBUG_INPUT1, 5886 "Sending a ABORT from packet entry!\n"); 5887 if (ch->chunk_type == SCTP_INITIATION) { 5888 /* 5889 * we do a trick here to get the INIT tag, dig in 5890 * and get the tag from the INIT and put it in the 5891 * common header. 5892 */ 5893 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5894 iphlen + sizeof(*sh), sizeof(*init_chk), 5895 (uint8_t *) & chunk_buf); 5896 if (init_chk != NULL) 5897 sh->v_tag = init_chk->init.initiate_tag; 5898 } 5899 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5900 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5901 goto bad; 5902 } 5903 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5904 goto bad; 5905 } 5906 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5907 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5908 goto bad; 5909 } else if (stcb == NULL) { 5910 refcount_up = 1; 5911 } 5912 #ifdef IPSEC 5913 /* 5914 * I very much doubt any of the IPSEC stuff will work but I have no 5915 * idea, so I will leave it in place. 5916 */ 5917 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5918 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5919 SCTP_STAT_INCR(sctps_hdrops); 5920 goto bad; 5921 } 5922 #endif /* IPSEC */ 5923 5924 /* 5925 * common chunk processing 5926 */ 5927 length = ip->ip_len + iphlen; 5928 offset -= sizeof(struct sctp_chunkhdr); 5929 5930 ecn_bits = ip->ip_tos; 5931 5932 /* sa_ignore NO_NULL_CHK */ 5933 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5934 inp, stcb, net, ecn_bits, vrf_id, port); 5935 /* inp's ref-count reduced && stcb unlocked */ 5936 if (m) { 5937 sctp_m_freem(m); 5938 } 5939 if ((inp) && (refcount_up)) { 5940 /* reduce ref-count */ 5941 SCTP_INP_DECR_REF(inp); 5942 } 5943 return; 5944 bad: 5945 if (stcb) { 5946 SCTP_TCB_UNLOCK(stcb); 5947 } 5948 if ((inp) && (refcount_up)) { 5949 /* reduce ref-count */ 5950 SCTP_INP_DECR_REF(inp); 5951 } 5952 if (m) { 5953 sctp_m_freem(m); 5954 } 5955 return; 5956 } 5957 5958 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5959 extern int *sctp_cpuarry; 5960 5961 #endif 5962 5963 void 5964 sctp_input(struct mbuf *m, int off) 5965 { 5966 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 5967 struct ip *ip; 5968 struct sctphdr *sh; 5969 int offset; 5970 int cpu_to_use; 5971 uint32_t flowid, tag; 5972 5973 if (mp_ncpus > 1) { 5974 if (m->m_flags & M_FLOWID) { 5975 flowid = m->m_pkthdr.flowid; 5976 } else { 5977 /* 5978 * No flow id built by lower layers fix it so we 5979 * create one. 5980 */ 5981 ip = mtod(m, struct ip *); 5982 offset = off + sizeof(*sh); 5983 if (SCTP_BUF_LEN(m) < offset) { 5984 if ((m = m_pullup(m, offset)) == 0) { 5985 SCTP_STAT_INCR(sctps_hdrops); 5986 return; 5987 } 5988 ip = mtod(m, struct ip *); 5989 } 5990 sh = (struct sctphdr *)((caddr_t)ip + off); 5991 tag = htonl(sh->v_tag); 5992 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5993 m->m_pkthdr.flowid = flowid; 5994 m->m_flags |= M_FLOWID; 5995 } 5996 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5997 sctp_queue_to_mcore(m, off, cpu_to_use); 5998 return; 5999 } 6000 #endif 6001 sctp_input_with_port(m, off, 0); 6002 } 6003