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sys/netinet/sctp_input.c
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1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, 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 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD: releng/8.4/sys/netinet/sctp_input.c 277808 2015-01-27 19:37:02Z delphij $"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #include <netinet/udp.h> 51 #include <sys/smp.h> 52 53 54 55 static void 56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57 { 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79 } 80 81 /* INIT handler */ 82 static void 83 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 86 struct sctp_tcb *stcb, int *abort_no_unlock, 87 uint8_t use_mflowid, uint32_t mflowid, 88 uint32_t vrf_id, uint16_t port) 89 { 90 struct sctp_init *init; 91 struct mbuf *op_err; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 (void *)stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 } 98 /* validate length */ 99 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 100 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 101 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 102 use_mflowid, mflowid, 103 vrf_id, port); 104 if (stcb) 105 *abort_no_unlock = 1; 106 goto outnow; 107 } 108 /* validate parameters */ 109 init = &cp->init; 110 if (init->initiate_tag == 0) { 111 /* protocol error... send abort */ 112 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 113 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 114 use_mflowid, mflowid, 115 vrf_id, port); 116 if (stcb) 117 *abort_no_unlock = 1; 118 goto outnow; 119 } 120 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 121 /* invalid parameter... send abort */ 122 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 123 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 124 use_mflowid, mflowid, 125 vrf_id, port); 126 if (stcb) 127 *abort_no_unlock = 1; 128 goto outnow; 129 } 130 if (init->num_inbound_streams == 0) { 131 /* protocol error... send abort */ 132 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 133 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 134 use_mflowid, mflowid, 135 vrf_id, port); 136 if (stcb) 137 *abort_no_unlock = 1; 138 goto outnow; 139 } 140 if (init->num_outbound_streams == 0) { 141 /* protocol error... send abort */ 142 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 143 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 144 use_mflowid, mflowid, 145 vrf_id, port); 146 if (stcb) 147 *abort_no_unlock = 1; 148 goto outnow; 149 } 150 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 151 offset + ntohs(cp->ch.chunk_length))) { 152 /* auth parameter(s) error... send abort */ 153 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL, 154 use_mflowid, mflowid, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 /* 161 * We are only accepting if we have a socket with positive 162 * so_qlimit. 163 */ 164 if ((stcb == NULL) && 165 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 166 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 167 (inp->sctp_socket == NULL) || 168 (inp->sctp_socket->so_qlimit == 0))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL, 183 use_mflowid, mflowid, 184 vrf_id, port); 185 } 186 goto outnow; 187 } 188 if ((stcb != NULL) && 189 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 190 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 191 sctp_send_shutdown_ack(stcb, NULL); 192 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 193 } else { 194 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 195 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 196 sh, cp, 197 use_mflowid, mflowid, 198 vrf_id, port, 199 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 200 } 201 outnow: 202 if (stcb == NULL) { 203 SCTP_INP_RUNLOCK(inp); 204 } 205 } 206 207 /* 208 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 209 */ 210 211 int 212 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 213 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 214 SCTP_UNUSED 215 #endif 216 ) 217 { 218 int unsent_data = 0; 219 unsigned int i; 220 struct sctp_stream_queue_pending *sp; 221 struct sctp_association *asoc; 222 223 /* 224 * This function returns the number of streams that have true unsent 225 * data on them. Note that as it looks through it will clean up any 226 * places that have old data that has been sent but left at top of 227 * stream queue. 228 */ 229 asoc = &stcb->asoc; 230 SCTP_TCB_SEND_LOCK(stcb); 231 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 232 /* Check to see if some data queued */ 233 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 234 /* sa_ignore FREED_MEMORY */ 235 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 236 if (sp == NULL) { 237 continue; 238 } 239 if ((sp->msg_is_complete) && 240 (sp->length == 0) && 241 (sp->sender_all_done)) { 242 /* 243 * We are doing differed cleanup. Last time 244 * through when we took all the data the 245 * sender_all_done was not set. 246 */ 247 if (sp->put_last_out == 0) { 248 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 249 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 250 sp->sender_all_done, 251 sp->length, 252 sp->msg_is_complete, 253 sp->put_last_out); 254 } 255 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 256 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 257 if (sp->net) { 258 sctp_free_remote_addr(sp->net); 259 sp->net = NULL; 260 } 261 if (sp->data) { 262 sctp_m_freem(sp->data); 263 sp->data = NULL; 264 } 265 sctp_free_a_strmoq(stcb, sp, so_locked); 266 } else { 267 unsent_data++; 268 break; 269 } 270 } 271 } 272 SCTP_TCB_SEND_UNLOCK(stcb); 273 return (unsent_data); 274 } 275 276 static int 277 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 278 { 279 struct sctp_init *init; 280 struct sctp_association *asoc; 281 struct sctp_nets *lnet; 282 unsigned int i; 283 284 init = &cp->init; 285 asoc = &stcb->asoc; 286 /* save off parameters */ 287 asoc->peer_vtag = ntohl(init->initiate_tag); 288 asoc->peers_rwnd = ntohl(init->a_rwnd); 289 /* init tsn's */ 290 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 291 292 if (!TAILQ_EMPTY(&asoc->nets)) { 293 /* update any ssthresh's that may have a default */ 294 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 295 lnet->ssthresh = asoc->peers_rwnd; 296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 297 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 298 } 299 } 300 } 301 SCTP_TCB_SEND_LOCK(stcb); 302 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 303 unsigned int newcnt; 304 struct sctp_stream_out *outs; 305 struct sctp_stream_queue_pending *sp, *nsp; 306 struct sctp_tmit_chunk *chk, *nchk; 307 308 /* abandon the upper streams */ 309 newcnt = ntohs(init->num_inbound_streams); 310 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 311 if (chk->rec.data.stream_number >= newcnt) { 312 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 313 asoc->send_queue_cnt--; 314 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 315 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 316 #ifdef INVARIANTS 317 } else { 318 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 319 #endif 320 } 321 if (chk->data != NULL) { 322 sctp_free_bufspace(stcb, asoc, chk, 1); 323 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 324 0, chk, SCTP_SO_NOT_LOCKED); 325 if (chk->data) { 326 sctp_m_freem(chk->data); 327 chk->data = NULL; 328 } 329 } 330 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 331 /* sa_ignore FREED_MEMORY */ 332 } 333 } 334 if (asoc->strmout) { 335 for (i = newcnt; i < asoc->pre_open_streams; i++) { 336 outs = &asoc->strmout[i]; 337 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 338 TAILQ_REMOVE(&outs->outqueue, sp, next); 339 asoc->stream_queue_cnt--; 340 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 341 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 342 if (sp->data) { 343 sctp_m_freem(sp->data); 344 sp->data = NULL; 345 } 346 if (sp->net) { 347 sctp_free_remote_addr(sp->net); 348 sp->net = NULL; 349 } 350 /* Free the chunk */ 351 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 352 /* sa_ignore FREED_MEMORY */ 353 } 354 } 355 } 356 /* cut back the count */ 357 asoc->pre_open_streams = newcnt; 358 } 359 SCTP_TCB_SEND_UNLOCK(stcb); 360 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 361 362 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 363 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 364 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 365 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 366 } 367 /* This is the next one we expect */ 368 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 369 370 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 371 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 372 373 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 374 /* open the requested streams */ 375 376 if (asoc->strmin != NULL) { 377 /* Free the old ones */ 378 struct sctp_queued_to_read *ctl, *nctl; 379 380 for (i = 0; i < asoc->streamincnt; i++) { 381 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 382 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 383 sctp_free_remote_addr(ctl->whoFrom); 384 ctl->whoFrom = NULL; 385 sctp_m_freem(ctl->data); 386 ctl->data = NULL; 387 sctp_free_a_readq(stcb, ctl); 388 } 389 } 390 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 391 } 392 asoc->streamincnt = ntohs(init->num_outbound_streams); 393 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 394 asoc->streamincnt = MAX_SCTP_STREAMS; 395 } 396 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 397 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 398 if (asoc->strmin == NULL) { 399 /* we didn't get memory for the streams! */ 400 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 401 return (-1); 402 } 403 for (i = 0; i < asoc->streamincnt; i++) { 404 asoc->strmin[i].stream_no = i; 405 asoc->strmin[i].last_sequence_delivered = 0xffff; 406 /* 407 * U-stream ranges will be set when the cookie is unpacked. 408 * Or for the INIT sender they are un set (if pr-sctp not 409 * supported) when the INIT-ACK arrives. 410 */ 411 TAILQ_INIT(&asoc->strmin[i].inqueue); 412 asoc->strmin[i].delivery_started = 0; 413 } 414 /* 415 * load_address_from_init will put the addresses into the 416 * association when the COOKIE is processed or the INIT-ACK is 417 * processed. Both types of COOKIE's existing and new call this 418 * routine. It will remove addresses that are no longer in the 419 * association (for the restarting case where addresses are 420 * removed). Up front when the INIT arrives we will discard it if it 421 * is a restart and new addresses have been added. 422 */ 423 /* sa_ignore MEMLEAK */ 424 return (0); 425 } 426 427 /* 428 * INIT-ACK message processing/consumption returns value < 0 on error 429 */ 430 static int 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 432 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 433 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 434 struct sctp_nets *net, int *abort_no_unlock, 435 uint8_t use_mflowid, uint32_t mflowid, 436 uint32_t vrf_id) 437 { 438 struct sctp_association *asoc; 439 struct mbuf *op_err; 440 int retval, abort_flag; 441 uint32_t initack_limit; 442 int nat_friendly = 0; 443 444 /* First verify that we have no illegal param's */ 445 abort_flag = 0; 446 op_err = NULL; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 451 if (abort_flag) { 452 /* Send an abort and notify peer */ 453 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 454 *abort_no_unlock = 1; 455 return (-1); 456 } 457 asoc = &stcb->asoc; 458 asoc->peer_supports_nat = (uint8_t) nat_friendly; 459 /* process the peer's parameters in the INIT-ACK */ 460 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 461 if (retval < 0) { 462 return (retval); 463 } 464 initack_limit = offset + ntohs(cp->ch.chunk_length); 465 /* load all addresses */ 466 if ((retval = sctp_load_addresses_from_init(stcb, m, 467 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 468 src, dst, NULL))) { 469 /* Huh, we should abort */ 470 SCTPDBG(SCTP_DEBUG_INPUT1, 471 "Load addresses from INIT causes an abort %d\n", 472 retval); 473 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 474 src, dst, sh, NULL, 475 use_mflowid, mflowid, 476 vrf_id, net->port); 477 *abort_no_unlock = 1; 478 return (-1); 479 } 480 /* if the peer doesn't support asconf, flush the asconf queue */ 481 if (asoc->peer_supports_asconf == 0) { 482 struct sctp_asconf_addr *param, *nparam; 483 484 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 485 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 486 SCTP_FREE(param, SCTP_M_ASC_ADDR); 487 } 488 } 489 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 490 stcb->asoc.local_hmacs); 491 if (op_err) { 492 sctp_queue_op_err(stcb, op_err); 493 /* queuing will steal away the mbuf chain to the out queue */ 494 op_err = NULL; 495 } 496 /* extract the cookie and queue it to "echo" it back... */ 497 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 498 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 499 stcb->asoc.overall_error_count, 500 0, 501 SCTP_FROM_SCTP_INPUT, 502 __LINE__); 503 } 504 stcb->asoc.overall_error_count = 0; 505 net->error_count = 0; 506 507 /* 508 * Cancel the INIT timer, We do this first before queueing the 509 * cookie. We always cancel at the primary to assue that we are 510 * canceling the timer started by the INIT which always goes to the 511 * primary. 512 */ 513 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 514 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 515 516 /* calculate the RTO */ 517 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 518 SCTP_RTT_FROM_NON_DATA); 519 520 retval = sctp_send_cookie_echo(m, offset, stcb, net); 521 if (retval < 0) { 522 /* 523 * No cookie, we probably should send a op error. But in any 524 * case if there is no cookie in the INIT-ACK, we can 525 * abandon the peer, its broke. 526 */ 527 if (retval == -3) { 528 /* We abort with an error of missing mandatory param */ 529 op_err = 530 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 531 if (op_err) { 532 /* 533 * Expand beyond to include the mandatory 534 * param cookie 535 */ 536 struct sctp_inv_mandatory_param *mp; 537 538 SCTP_BUF_LEN(op_err) = 539 sizeof(struct sctp_inv_mandatory_param); 540 mp = mtod(op_err, 541 struct sctp_inv_mandatory_param *); 542 /* Subtract the reserved param */ 543 mp->length = 544 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 545 mp->num_param = htonl(1); 546 mp->param = htons(SCTP_STATE_COOKIE); 547 mp->resv = 0; 548 } 549 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 550 src, dst, sh, op_err, 551 use_mflowid, mflowid, 552 vrf_id, net->port); 553 *abort_no_unlock = 1; 554 } 555 return (retval); 556 } 557 return (0); 558 } 559 560 static void 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 562 struct sctp_tcb *stcb, struct sctp_nets *net) 563 { 564 struct sockaddr_storage store; 565 struct sctp_nets *r_net, *f_net; 566 struct timeval tv; 567 int req_prim = 0; 568 uint16_t old_error_counter; 569 570 #ifdef INET 571 struct sockaddr_in *sin; 572 573 #endif 574 #ifdef INET6 575 struct sockaddr_in6 *sin6; 576 577 #endif 578 579 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 580 /* Invalid length */ 581 return; 582 } 583 memset(&store, 0, sizeof(store)); 584 switch (cp->heartbeat.hb_info.addr_family) { 585 #ifdef INET 586 case AF_INET: 587 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 588 sin = (struct sockaddr_in *)&store; 589 sin->sin_family = cp->heartbeat.hb_info.addr_family; 590 sin->sin_len = cp->heartbeat.hb_info.addr_len; 591 sin->sin_port = stcb->rport; 592 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 593 sizeof(sin->sin_addr)); 594 } else { 595 return; 596 } 597 break; 598 #endif 599 #ifdef INET6 600 case AF_INET6: 601 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 602 sin6 = (struct sockaddr_in6 *)&store; 603 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 604 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 605 sin6->sin6_port = stcb->rport; 606 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 607 sizeof(sin6->sin6_addr)); 608 } else { 609 return; 610 } 611 break; 612 #endif 613 default: 614 return; 615 } 616 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 617 if (r_net == NULL) { 618 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 619 return; 620 } 621 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 622 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 623 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 624 /* 625 * If the its a HB and it's random value is correct when can 626 * confirm the destination. 627 */ 628 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 629 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 630 stcb->asoc.primary_destination = r_net; 631 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 632 f_net = TAILQ_FIRST(&stcb->asoc.nets); 633 if (f_net != r_net) { 634 /* 635 * first one on the list is NOT the primary 636 * sctp_cmpaddr() is much more efficent if 637 * the primary is the first on the list, 638 * make it so. 639 */ 640 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 641 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 642 } 643 req_prim = 1; 644 } 645 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 646 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 647 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 648 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 649 } 650 old_error_counter = r_net->error_count; 651 r_net->error_count = 0; 652 r_net->hb_responded = 1; 653 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 654 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 655 /* Now lets do a RTO with this */ 656 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 657 SCTP_RTT_FROM_NON_DATA); 658 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 659 r_net->dest_state |= SCTP_ADDR_REACHABLE; 660 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 661 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 662 } 663 if (r_net->dest_state & SCTP_ADDR_PF) { 664 r_net->dest_state &= ~SCTP_ADDR_PF; 665 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 666 } 667 if (old_error_counter > 0) { 668 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 669 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 670 } 671 if (r_net == stcb->asoc.primary_destination) { 672 if (stcb->asoc.alternate) { 673 /* release the alternate, primary is good */ 674 sctp_free_remote_addr(stcb->asoc.alternate); 675 stcb->asoc.alternate = NULL; 676 } 677 } 678 /* Mobility adaptation */ 679 if (req_prim) { 680 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_BASE) || 682 sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_FASTHANDOFF)) && 684 sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_PRIM_DELETED)) { 686 687 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 688 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) { 690 sctp_assoc_immediate_retrans(stcb, 691 stcb->asoc.primary_destination); 692 } 693 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 694 SCTP_MOBILITY_BASE)) { 695 sctp_move_chunks_from_net(stcb, 696 stcb->asoc.deleted_primary); 697 } 698 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 699 stcb->asoc.deleted_primary); 700 } 701 } 702 } 703 704 static int 705 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 706 { 707 /* 708 * return 0 means we want you to proceed with the abort non-zero 709 * means no abort processing 710 */ 711 struct sctpasochead *head; 712 713 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 714 /* generate a new vtag and send init */ 715 LIST_REMOVE(stcb, sctp_asocs); 716 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 724 return (1); 725 } 726 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 727 /* 728 * treat like a case where the cookie expired i.e.: - dump 729 * current cookie. - generate a new vtag. - resend init. 730 */ 731 /* generate a new vtag and send init */ 732 LIST_REMOVE(stcb, sctp_asocs); 733 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 734 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 735 sctp_stop_all_cookie_timers(stcb); 736 sctp_toss_old_cookies(stcb, &stcb->asoc); 737 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 738 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 739 /* 740 * put it in the bucket in the vtag hash of assoc's for the 741 * system 742 */ 743 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 744 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 745 return (1); 746 } 747 return (0); 748 } 749 750 static int 751 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 752 struct sctp_nets *net) 753 { 754 /* 755 * return 0 means we want you to proceed with the abort non-zero 756 * means no abort processing 757 */ 758 if (stcb->asoc.peer_supports_auth == 0) { 759 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 760 return (0); 761 } 762 sctp_asconf_send_nat_state_update(stcb, net); 763 return (1); 764 } 765 766 767 static void 768 sctp_handle_abort(struct sctp_abort_chunk *abort, 769 struct sctp_tcb *stcb, struct sctp_nets *net) 770 { 771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 772 struct socket *so; 773 774 #endif 775 uint16_t len; 776 uint16_t error; 777 778 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 779 if (stcb == NULL) 780 return; 781 782 len = ntohs(abort->ch.chunk_length); 783 if (len > sizeof(struct sctp_chunkhdr)) { 784 /* 785 * Need to check the cause codes for our two magic nat 786 * aborts which don't kill the assoc necessarily. 787 */ 788 struct sctp_missing_nat_state *natc; 789 790 natc = (struct sctp_missing_nat_state *)(abort + 1); 791 error = ntohs(natc->cause); 792 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 793 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 794 abort->ch.chunk_flags); 795 if (sctp_handle_nat_colliding_state(stcb)) { 796 return; 797 } 798 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 799 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 800 abort->ch.chunk_flags); 801 if (sctp_handle_nat_missing_state(stcb, net)) { 802 return; 803 } 804 } 805 } else { 806 error = 0; 807 } 808 /* stop any receive timers */ 809 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 810 /* notify user of the abort and clean up... */ 811 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 812 /* free the tcb */ 813 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 814 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 815 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 816 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 817 } 818 #ifdef SCTP_ASOCLOG_OF_TSNS 819 sctp_print_out_track_log(stcb); 820 #endif 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 so = SCTP_INP_SO(stcb->sctp_ep); 823 atomic_add_int(&stcb->asoc.refcnt, 1); 824 SCTP_TCB_UNLOCK(stcb); 825 SCTP_SOCKET_LOCK(so, 1); 826 SCTP_TCB_LOCK(stcb); 827 atomic_subtract_int(&stcb->asoc.refcnt, 1); 828 #endif 829 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 830 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 831 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 832 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 833 SCTP_SOCKET_UNLOCK(so, 1); 834 #endif 835 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 836 } 837 838 static void 839 sctp_start_net_timers(struct sctp_tcb *stcb) 840 { 841 uint32_t cnt_hb_sent; 842 struct sctp_nets *net; 843 844 cnt_hb_sent = 0; 845 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 846 /* 847 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 848 * If the dest in unconfirmed send a hb as well if under 849 * max_hb_burst have been sent. 850 */ 851 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 852 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 853 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 854 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 855 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 856 cnt_hb_sent++; 857 } 858 } 859 if (cnt_hb_sent) { 860 sctp_chunk_output(stcb->sctp_ep, stcb, 861 SCTP_OUTPUT_FROM_COOKIE_ACK, 862 SCTP_SO_NOT_LOCKED); 863 } 864 } 865 866 867 static void 868 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 869 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 870 { 871 struct sctp_association *asoc; 872 int some_on_streamwheel; 873 874 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 875 struct socket *so; 876 877 #endif 878 879 SCTPDBG(SCTP_DEBUG_INPUT2, 880 "sctp_handle_shutdown: handling SHUTDOWN\n"); 881 if (stcb == NULL) 882 return; 883 asoc = &stcb->asoc; 884 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 885 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 886 return; 887 } 888 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 889 /* Shutdown NOT the expected size */ 890 return; 891 } else { 892 sctp_update_acked(stcb, cp, abort_flag); 893 if (*abort_flag) { 894 return; 895 } 896 } 897 if (asoc->control_pdapi) { 898 /* 899 * With a normal shutdown we assume the end of last record. 900 */ 901 SCTP_INP_READ_LOCK(stcb->sctp_ep); 902 asoc->control_pdapi->end_added = 1; 903 asoc->control_pdapi->pdapi_aborted = 1; 904 asoc->control_pdapi = NULL; 905 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 906 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 907 so = SCTP_INP_SO(stcb->sctp_ep); 908 atomic_add_int(&stcb->asoc.refcnt, 1); 909 SCTP_TCB_UNLOCK(stcb); 910 SCTP_SOCKET_LOCK(so, 1); 911 SCTP_TCB_LOCK(stcb); 912 atomic_subtract_int(&stcb->asoc.refcnt, 1); 913 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 914 /* assoc was freed while we were unlocked */ 915 SCTP_SOCKET_UNLOCK(so, 1); 916 return; 917 } 918 #endif 919 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 920 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 921 SCTP_SOCKET_UNLOCK(so, 1); 922 #endif 923 } 924 /* goto SHUTDOWN_RECEIVED state to block new requests */ 925 if (stcb->sctp_socket) { 926 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 927 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 928 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 929 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 930 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 931 /* 932 * notify upper layer that peer has initiated a 933 * shutdown 934 */ 935 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 936 937 /* reset time */ 938 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 939 } 940 } 941 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 942 /* 943 * stop the shutdown timer, since we WILL move to 944 * SHUTDOWN-ACK-SENT. 945 */ 946 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 947 } 948 /* Now is there unsent data on a stream somewhere? */ 949 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 950 951 if (!TAILQ_EMPTY(&asoc->send_queue) || 952 !TAILQ_EMPTY(&asoc->sent_queue) || 953 some_on_streamwheel) { 954 /* By returning we will push more data out */ 955 return; 956 } else { 957 /* no outstanding data to send, so move on... */ 958 /* send SHUTDOWN-ACK */ 959 /* move to SHUTDOWN-ACK-SENT state */ 960 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 961 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 962 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 963 } 964 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 965 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 966 sctp_stop_timers_for_shutdown(stcb); 967 sctp_send_shutdown_ack(stcb, net); 968 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 969 stcb, net); 970 } 971 } 972 973 static void 974 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 975 struct sctp_tcb *stcb, 976 struct sctp_nets *net) 977 { 978 struct sctp_association *asoc; 979 980 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 981 struct socket *so; 982 983 so = SCTP_INP_SO(stcb->sctp_ep); 984 #endif 985 SCTPDBG(SCTP_DEBUG_INPUT2, 986 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 987 if (stcb == NULL) 988 return; 989 990 asoc = &stcb->asoc; 991 /* process according to association state */ 992 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 993 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 994 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 995 sctp_send_shutdown_complete(stcb, net, 1); 996 SCTP_TCB_UNLOCK(stcb); 997 return; 998 } 999 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1000 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1001 /* unexpected SHUTDOWN-ACK... so ignore... */ 1002 SCTP_TCB_UNLOCK(stcb); 1003 return; 1004 } 1005 if (asoc->control_pdapi) { 1006 /* 1007 * With a normal shutdown we assume the end of last record. 1008 */ 1009 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1010 asoc->control_pdapi->end_added = 1; 1011 asoc->control_pdapi->pdapi_aborted = 1; 1012 asoc->control_pdapi = NULL; 1013 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1014 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1015 atomic_add_int(&stcb->asoc.refcnt, 1); 1016 SCTP_TCB_UNLOCK(stcb); 1017 SCTP_SOCKET_LOCK(so, 1); 1018 SCTP_TCB_LOCK(stcb); 1019 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1020 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1021 /* assoc was freed while we were unlocked */ 1022 SCTP_SOCKET_UNLOCK(so, 1); 1023 return; 1024 } 1025 #endif 1026 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1027 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1028 SCTP_SOCKET_UNLOCK(so, 1); 1029 #endif 1030 } 1031 /* are the queues empty? */ 1032 if (!TAILQ_EMPTY(&asoc->send_queue) || 1033 !TAILQ_EMPTY(&asoc->sent_queue) || 1034 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1035 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1036 } 1037 /* stop the timer */ 1038 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1039 /* send SHUTDOWN-COMPLETE */ 1040 sctp_send_shutdown_complete(stcb, net, 0); 1041 /* notify upper layer protocol */ 1042 if (stcb->sctp_socket) { 1043 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1044 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1045 stcb->sctp_socket->so_snd.sb_cc = 0; 1046 } 1047 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1048 } 1049 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1050 /* free the TCB but first save off the ep */ 1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1052 atomic_add_int(&stcb->asoc.refcnt, 1); 1053 SCTP_TCB_UNLOCK(stcb); 1054 SCTP_SOCKET_LOCK(so, 1); 1055 SCTP_TCB_LOCK(stcb); 1056 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1057 #endif 1058 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1059 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1060 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062 #endif 1063 } 1064 1065 /* 1066 * Skip past the param header and then we will find the chunk that caused the 1067 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1068 * our peer must be broken. 1069 */ 1070 static void 1071 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1072 struct sctp_nets *net) 1073 { 1074 struct sctp_chunkhdr *chk; 1075 1076 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1077 switch (chk->chunk_type) { 1078 case SCTP_ASCONF_ACK: 1079 case SCTP_ASCONF: 1080 sctp_asconf_cleanup(stcb, net); 1081 break; 1082 case SCTP_FORWARD_CUM_TSN: 1083 stcb->asoc.peer_supports_prsctp = 0; 1084 break; 1085 default: 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Peer does not support chunk type %d(%x)??\n", 1088 chk->chunk_type, (uint32_t) chk->chunk_type); 1089 break; 1090 } 1091 } 1092 1093 /* 1094 * Skip past the param header and then we will find the param that caused the 1095 * problem. There are a number of param's in a ASCONF OR the prsctp param 1096 * these will turn of specific features. 1097 */ 1098 static void 1099 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1100 { 1101 struct sctp_paramhdr *pbad; 1102 1103 pbad = phdr + 1; 1104 switch (ntohs(pbad->param_type)) { 1105 /* pr-sctp draft */ 1106 case SCTP_PRSCTP_SUPPORTED: 1107 stcb->asoc.peer_supports_prsctp = 0; 1108 break; 1109 case SCTP_SUPPORTED_CHUNK_EXT: 1110 break; 1111 /* draft-ietf-tsvwg-addip-sctp */ 1112 case SCTP_HAS_NAT_SUPPORT: 1113 stcb->asoc.peer_supports_nat = 0; 1114 break; 1115 case SCTP_ADD_IP_ADDRESS: 1116 case SCTP_DEL_IP_ADDRESS: 1117 case SCTP_SET_PRIM_ADDR: 1118 stcb->asoc.peer_supports_asconf = 0; 1119 break; 1120 case SCTP_SUCCESS_REPORT: 1121 case SCTP_ERROR_CAUSE_IND: 1122 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1123 SCTPDBG(SCTP_DEBUG_INPUT2, 1124 "Turning off ASCONF to this strange peer\n"); 1125 stcb->asoc.peer_supports_asconf = 0; 1126 break; 1127 default: 1128 SCTPDBG(SCTP_DEBUG_INPUT2, 1129 "Peer does not support param type %d(%x)??\n", 1130 pbad->param_type, (uint32_t) pbad->param_type); 1131 break; 1132 } 1133 } 1134 1135 static int 1136 sctp_handle_error(struct sctp_chunkhdr *ch, 1137 struct sctp_tcb *stcb, struct sctp_nets *net) 1138 { 1139 int chklen; 1140 struct sctp_paramhdr *phdr; 1141 uint16_t error, error_type; 1142 uint16_t error_len; 1143 struct sctp_association *asoc; 1144 int adjust; 1145 1146 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1147 struct socket *so; 1148 1149 #endif 1150 1151 /* parse through all of the errors and process */ 1152 asoc = &stcb->asoc; 1153 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1154 sizeof(struct sctp_chunkhdr)); 1155 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1156 error = 0; 1157 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1158 /* Process an Error Cause */ 1159 error_type = ntohs(phdr->param_type); 1160 error_len = ntohs(phdr->param_length); 1161 if ((error_len > chklen) || (error_len == 0)) { 1162 /* invalid param length for this param */ 1163 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1164 chklen, error_len); 1165 return (0); 1166 } 1167 if (error == 0) { 1168 /* report the first error cause */ 1169 error = error_type; 1170 } 1171 switch (error_type) { 1172 case SCTP_CAUSE_INVALID_STREAM: 1173 case SCTP_CAUSE_MISSING_PARAM: 1174 case SCTP_CAUSE_INVALID_PARAM: 1175 case SCTP_CAUSE_NO_USER_DATA: 1176 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1177 error_type); 1178 break; 1179 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1180 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1181 ch->chunk_flags); 1182 if (sctp_handle_nat_colliding_state(stcb)) { 1183 return (0); 1184 } 1185 break; 1186 case SCTP_CAUSE_NAT_MISSING_STATE: 1187 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1188 ch->chunk_flags); 1189 if (sctp_handle_nat_missing_state(stcb, net)) { 1190 return (0); 1191 } 1192 break; 1193 case SCTP_CAUSE_STALE_COOKIE: 1194 /* 1195 * We only act if we have echoed a cookie and are 1196 * waiting. 1197 */ 1198 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1199 int *p; 1200 1201 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1202 /* Save the time doubled */ 1203 asoc->cookie_preserve_req = ntohl(*p) << 1; 1204 asoc->stale_cookie_count++; 1205 if (asoc->stale_cookie_count > 1206 asoc->max_init_times) { 1207 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1208 /* now free the asoc */ 1209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1210 so = SCTP_INP_SO(stcb->sctp_ep); 1211 atomic_add_int(&stcb->asoc.refcnt, 1); 1212 SCTP_TCB_UNLOCK(stcb); 1213 SCTP_SOCKET_LOCK(so, 1); 1214 SCTP_TCB_LOCK(stcb); 1215 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1216 #endif 1217 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1218 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1219 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1220 SCTP_SOCKET_UNLOCK(so, 1); 1221 #endif 1222 return (-1); 1223 } 1224 /* blast back to INIT state */ 1225 sctp_toss_old_cookies(stcb, &stcb->asoc); 1226 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1227 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1228 sctp_stop_all_cookie_timers(stcb); 1229 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1230 } 1231 break; 1232 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1233 /* 1234 * Nothing we can do here, we don't do hostname 1235 * addresses so if the peer does not like my IPv6 1236 * (or IPv4 for that matter) it does not matter. If 1237 * they don't support that type of address, they can 1238 * NOT possibly get that packet type... i.e. with no 1239 * IPv6 you can't recieve a IPv6 packet. so we can 1240 * safely ignore this one. If we ever added support 1241 * for HOSTNAME Addresses, then we would need to do 1242 * something here. 1243 */ 1244 break; 1245 case SCTP_CAUSE_UNRECOG_CHUNK: 1246 sctp_process_unrecog_chunk(stcb, phdr, net); 1247 break; 1248 case SCTP_CAUSE_UNRECOG_PARAM: 1249 sctp_process_unrecog_param(stcb, phdr); 1250 break; 1251 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1252 /* 1253 * We ignore this since the timer will drive out a 1254 * new cookie anyway and there timer will drive us 1255 * to send a SHUTDOWN_COMPLETE. We can't send one 1256 * here since we don't have their tag. 1257 */ 1258 break; 1259 case SCTP_CAUSE_DELETING_LAST_ADDR: 1260 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1261 case SCTP_CAUSE_DELETING_SRC_ADDR: 1262 /* 1263 * We should NOT get these here, but in a 1264 * ASCONF-ACK. 1265 */ 1266 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1267 error_type); 1268 break; 1269 case SCTP_CAUSE_OUT_OF_RESC: 1270 /* 1271 * And what, pray tell do we do with the fact that 1272 * the peer is out of resources? Not really sure we 1273 * could do anything but abort. I suspect this 1274 * should have came WITH an abort instead of in a 1275 * OP-ERROR. 1276 */ 1277 break; 1278 default: 1279 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1280 error_type); 1281 break; 1282 } 1283 adjust = SCTP_SIZE32(error_len); 1284 chklen -= adjust; 1285 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1286 } 1287 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1288 return (0); 1289 } 1290 1291 static int 1292 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1293 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1294 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1295 struct sctp_nets *net, int *abort_no_unlock, 1296 uint8_t use_mflowid, uint32_t mflowid, 1297 uint32_t vrf_id) 1298 { 1299 struct sctp_init_ack *init_ack; 1300 struct mbuf *op_err; 1301 1302 SCTPDBG(SCTP_DEBUG_INPUT2, 1303 "sctp_handle_init_ack: handling INIT-ACK\n"); 1304 1305 if (stcb == NULL) { 1306 SCTPDBG(SCTP_DEBUG_INPUT2, 1307 "sctp_handle_init_ack: TCB is null\n"); 1308 return (-1); 1309 } 1310 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1311 /* Invalid length */ 1312 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1313 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1314 src, dst, sh, op_err, 1315 use_mflowid, mflowid, 1316 vrf_id, net->port); 1317 *abort_no_unlock = 1; 1318 return (-1); 1319 } 1320 init_ack = &cp->init; 1321 /* validate parameters */ 1322 if (init_ack->initiate_tag == 0) { 1323 /* protocol error... send an abort */ 1324 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1325 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1326 src, dst, sh, op_err, 1327 use_mflowid, mflowid, 1328 vrf_id, net->port); 1329 *abort_no_unlock = 1; 1330 return (-1); 1331 } 1332 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1333 /* protocol error... send an abort */ 1334 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1335 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1336 src, dst, sh, op_err, 1337 use_mflowid, mflowid, 1338 vrf_id, net->port); 1339 *abort_no_unlock = 1; 1340 return (-1); 1341 } 1342 if (init_ack->num_inbound_streams == 0) { 1343 /* protocol error... send an abort */ 1344 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1345 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1346 src, dst, sh, op_err, 1347 use_mflowid, mflowid, 1348 vrf_id, net->port); 1349 *abort_no_unlock = 1; 1350 return (-1); 1351 } 1352 if (init_ack->num_outbound_streams == 0) { 1353 /* protocol error... send an abort */ 1354 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1355 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1356 src, dst, sh, op_err, 1357 use_mflowid, mflowid, 1358 vrf_id, net->port); 1359 *abort_no_unlock = 1; 1360 return (-1); 1361 } 1362 /* process according to association state... */ 1363 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1364 case SCTP_STATE_COOKIE_WAIT: 1365 /* this is the expected state for this chunk */ 1366 /* process the INIT-ACK parameters */ 1367 if (stcb->asoc.primary_destination->dest_state & 1368 SCTP_ADDR_UNCONFIRMED) { 1369 /* 1370 * The primary is where we sent the INIT, we can 1371 * always consider it confirmed when the INIT-ACK is 1372 * returned. Do this before we load addresses 1373 * though. 1374 */ 1375 stcb->asoc.primary_destination->dest_state &= 1376 ~SCTP_ADDR_UNCONFIRMED; 1377 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1378 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1379 } 1380 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1381 net, abort_no_unlock, 1382 use_mflowid, mflowid, 1383 vrf_id) < 0) { 1384 /* error in parsing parameters */ 1385 return (-1); 1386 } 1387 /* update our state */ 1388 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1389 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1390 1391 /* reset the RTO calc */ 1392 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1393 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1394 stcb->asoc.overall_error_count, 1395 0, 1396 SCTP_FROM_SCTP_INPUT, 1397 __LINE__); 1398 } 1399 stcb->asoc.overall_error_count = 0; 1400 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1401 /* 1402 * collapse the init timer back in case of a exponential 1403 * backoff 1404 */ 1405 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1406 stcb, net); 1407 /* 1408 * the send at the end of the inbound data processing will 1409 * cause the cookie to be sent 1410 */ 1411 break; 1412 case SCTP_STATE_SHUTDOWN_SENT: 1413 /* incorrect state... discard */ 1414 break; 1415 case SCTP_STATE_COOKIE_ECHOED: 1416 /* incorrect state... discard */ 1417 break; 1418 case SCTP_STATE_OPEN: 1419 /* incorrect state... discard */ 1420 break; 1421 case SCTP_STATE_EMPTY: 1422 case SCTP_STATE_INUSE: 1423 default: 1424 /* incorrect state... discard */ 1425 return (-1); 1426 break; 1427 } 1428 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1429 return (0); 1430 } 1431 1432 static struct sctp_tcb * 1433 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1434 struct sockaddr *src, struct sockaddr *dst, 1435 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1436 struct sctp_inpcb *inp, struct sctp_nets **netp, 1437 struct sockaddr *init_src, int *notification, 1438 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1439 uint8_t use_mflowid, uint32_t mflowid, 1440 uint32_t vrf_id, uint16_t port); 1441 1442 1443 /* 1444 * handle a state cookie for an existing association m: input packet mbuf 1445 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1446 * "split" mbuf and the cookie signature does not exist offset: offset into 1447 * mbuf to the cookie-echo chunk 1448 */ 1449 static struct sctp_tcb * 1450 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1451 struct sockaddr *src, struct sockaddr *dst, 1452 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1453 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1454 struct sockaddr *init_src, int *notification, 1455 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1456 uint8_t use_mflowid, uint32_t mflowid, 1457 uint32_t vrf_id, uint16_t port) 1458 { 1459 struct sctp_association *asoc; 1460 struct sctp_init_chunk *init_cp, init_buf; 1461 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1462 struct sctp_nets *net; 1463 struct mbuf *op_err; 1464 struct sctp_paramhdr *ph; 1465 int init_offset, initack_offset, i; 1466 int retval; 1467 int spec_flag = 0; 1468 uint32_t how_indx; 1469 1470 net = *netp; 1471 /* I know that the TCB is non-NULL from the caller */ 1472 asoc = &stcb->asoc; 1473 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1474 if (asoc->cookie_how[how_indx] == 0) 1475 break; 1476 } 1477 if (how_indx < sizeof(asoc->cookie_how)) { 1478 asoc->cookie_how[how_indx] = 1; 1479 } 1480 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1481 /* SHUTDOWN came in after sending INIT-ACK */ 1482 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1483 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1484 0, M_DONTWAIT, 1, MT_DATA); 1485 if (op_err == NULL) { 1486 /* FOOBAR */ 1487 return (NULL); 1488 } 1489 /* Set the len */ 1490 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1491 ph = mtod(op_err, struct sctp_paramhdr *); 1492 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1493 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1494 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1495 use_mflowid, mflowid, 1496 vrf_id, net->port); 1497 if (how_indx < sizeof(asoc->cookie_how)) 1498 asoc->cookie_how[how_indx] = 2; 1499 return (NULL); 1500 } 1501 /* 1502 * find and validate the INIT chunk in the cookie (peer's info) the 1503 * INIT should start after the cookie-echo header struct (chunk 1504 * header, state cookie header struct) 1505 */ 1506 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1507 1508 init_cp = (struct sctp_init_chunk *) 1509 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1510 (uint8_t *) & init_buf); 1511 if (init_cp == NULL) { 1512 /* could not pull a INIT chunk in cookie */ 1513 return (NULL); 1514 } 1515 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1516 return (NULL); 1517 } 1518 /* 1519 * find and validate the INIT-ACK chunk in the cookie (my info) the 1520 * INIT-ACK follows the INIT chunk 1521 */ 1522 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1523 initack_cp = (struct sctp_init_ack_chunk *) 1524 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1525 (uint8_t *) & initack_buf); 1526 if (initack_cp == NULL) { 1527 /* could not pull INIT-ACK chunk in cookie */ 1528 return (NULL); 1529 } 1530 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1531 return (NULL); 1532 } 1533 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1534 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1535 /* 1536 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1537 * to get into the OPEN state 1538 */ 1539 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1540 /*- 1541 * Opps, this means that we somehow generated two vtag's 1542 * the same. I.e. we did: 1543 * Us Peer 1544 * <---INIT(tag=a)------ 1545 * ----INIT-ACK(tag=t)--> 1546 * ----INIT(tag=t)------> *1 1547 * <---INIT-ACK(tag=a)--- 1548 * <----CE(tag=t)------------- *2 1549 * 1550 * At point *1 we should be generating a different 1551 * tag t'. Which means we would throw away the CE and send 1552 * ours instead. Basically this is case C (throw away side). 1553 */ 1554 if (how_indx < sizeof(asoc->cookie_how)) 1555 asoc->cookie_how[how_indx] = 17; 1556 return (NULL); 1557 1558 } 1559 switch SCTP_GET_STATE 1560 (asoc) { 1561 case SCTP_STATE_COOKIE_WAIT: 1562 case SCTP_STATE_COOKIE_ECHOED: 1563 /* 1564 * INIT was sent but got a COOKIE_ECHO with the 1565 * correct tags... just accept it...but we must 1566 * process the init so that we can make sure we have 1567 * the right seq no's. 1568 */ 1569 /* First we must process the INIT !! */ 1570 retval = sctp_process_init(init_cp, stcb); 1571 if (retval < 0) { 1572 if (how_indx < sizeof(asoc->cookie_how)) 1573 asoc->cookie_how[how_indx] = 3; 1574 return (NULL); 1575 } 1576 /* we have already processed the INIT so no problem */ 1577 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1578 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1579 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1580 /* update current state */ 1581 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1582 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1583 else 1584 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1585 1586 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1587 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1588 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1589 stcb->sctp_ep, stcb, asoc->primary_destination); 1590 } 1591 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1592 sctp_stop_all_cookie_timers(stcb); 1593 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1594 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1595 (inp->sctp_socket->so_qlimit == 0) 1596 ) { 1597 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1598 struct socket *so; 1599 1600 #endif 1601 /* 1602 * Here is where collision would go if we 1603 * did a connect() and instead got a 1604 * init/init-ack/cookie done before the 1605 * init-ack came back.. 1606 */ 1607 stcb->sctp_ep->sctp_flags |= 1608 SCTP_PCB_FLAGS_CONNECTED; 1609 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1610 so = SCTP_INP_SO(stcb->sctp_ep); 1611 atomic_add_int(&stcb->asoc.refcnt, 1); 1612 SCTP_TCB_UNLOCK(stcb); 1613 SCTP_SOCKET_LOCK(so, 1); 1614 SCTP_TCB_LOCK(stcb); 1615 atomic_add_int(&stcb->asoc.refcnt, -1); 1616 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1617 SCTP_SOCKET_UNLOCK(so, 1); 1618 return (NULL); 1619 } 1620 #endif 1621 soisconnected(stcb->sctp_socket); 1622 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1623 SCTP_SOCKET_UNLOCK(so, 1); 1624 #endif 1625 } 1626 /* notify upper layer */ 1627 *notification = SCTP_NOTIFY_ASSOC_UP; 1628 /* 1629 * since we did not send a HB make sure we don't 1630 * double things 1631 */ 1632 net->hb_responded = 1; 1633 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1634 &cookie->time_entered, 1635 sctp_align_unsafe_makecopy, 1636 SCTP_RTT_FROM_NON_DATA); 1637 1638 if (stcb->asoc.sctp_autoclose_ticks && 1639 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1640 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1641 inp, stcb, NULL); 1642 } 1643 break; 1644 default: 1645 /* 1646 * we're in the OPEN state (or beyond), so peer must 1647 * have simply lost the COOKIE-ACK 1648 */ 1649 break; 1650 } /* end switch */ 1651 sctp_stop_all_cookie_timers(stcb); 1652 /* 1653 * We ignore the return code here.. not sure if we should 1654 * somehow abort.. but we do have an existing asoc. This 1655 * really should not fail. 1656 */ 1657 if (sctp_load_addresses_from_init(stcb, m, 1658 init_offset + sizeof(struct sctp_init_chunk), 1659 initack_offset, src, dst, init_src)) { 1660 if (how_indx < sizeof(asoc->cookie_how)) 1661 asoc->cookie_how[how_indx] = 4; 1662 return (NULL); 1663 } 1664 /* respond with a COOKIE-ACK */ 1665 sctp_toss_old_cookies(stcb, asoc); 1666 sctp_send_cookie_ack(stcb); 1667 if (how_indx < sizeof(asoc->cookie_how)) 1668 asoc->cookie_how[how_indx] = 5; 1669 return (stcb); 1670 } 1671 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1672 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1673 cookie->tie_tag_my_vtag == 0 && 1674 cookie->tie_tag_peer_vtag == 0) { 1675 /* 1676 * case C in Section 5.2.4 Table 2: XMOO silently discard 1677 */ 1678 if (how_indx < sizeof(asoc->cookie_how)) 1679 asoc->cookie_how[how_indx] = 6; 1680 return (NULL); 1681 } 1682 /* 1683 * If nat support, and the below and stcb is established, send back 1684 * a ABORT(colliding state) if we are established. 1685 */ 1686 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1687 (asoc->peer_supports_nat) && 1688 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1689 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1690 (asoc->peer_vtag == 0)))) { 1691 /* 1692 * Special case - Peer's support nat. We may have two init's 1693 * that we gave out the same tag on since one was not 1694 * established.. i.e. we get INIT from host-1 behind the nat 1695 * and we respond tag-a, we get a INIT from host-2 behind 1696 * the nat and we get tag-a again. Then we bring up host-1 1697 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1698 * Now we have colliding state. We must send an abort here 1699 * with colliding state indication. 1700 */ 1701 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1702 0, M_DONTWAIT, 1, MT_DATA); 1703 if (op_err == NULL) { 1704 /* FOOBAR */ 1705 return (NULL); 1706 } 1707 /* pre-reserve some space */ 1708 #ifdef INET6 1709 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1710 #else 1711 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1712 #endif 1713 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1714 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1715 /* Set the len */ 1716 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1717 ph = mtod(op_err, struct sctp_paramhdr *); 1718 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1719 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1720 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1721 use_mflowid, mflowid, 1722 vrf_id, port); 1723 return (NULL); 1724 } 1725 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1726 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1727 (asoc->peer_vtag == 0))) { 1728 /* 1729 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1730 * should be ok, re-accept peer info 1731 */ 1732 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1733 /* 1734 * Extension of case C. If we hit this, then the 1735 * random number generator returned the same vtag 1736 * when we first sent our INIT-ACK and when we later 1737 * sent our INIT. The side with the seq numbers that 1738 * are different will be the one that normnally 1739 * would have hit case C. This in effect "extends" 1740 * our vtags in this collision case to be 64 bits. 1741 * The same collision could occur aka you get both 1742 * vtag and seq number the same twice in a row.. but 1743 * is much less likely. If it did happen then we 1744 * would proceed through and bring up the assoc.. we 1745 * may end up with the wrong stream setup however.. 1746 * which would be bad.. but there is no way to 1747 * tell.. until we send on a stream that does not 1748 * exist :-) 1749 */ 1750 if (how_indx < sizeof(asoc->cookie_how)) 1751 asoc->cookie_how[how_indx] = 7; 1752 1753 return (NULL); 1754 } 1755 if (how_indx < sizeof(asoc->cookie_how)) 1756 asoc->cookie_how[how_indx] = 8; 1757 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1758 sctp_stop_all_cookie_timers(stcb); 1759 /* 1760 * since we did not send a HB make sure we don't double 1761 * things 1762 */ 1763 net->hb_responded = 1; 1764 if (stcb->asoc.sctp_autoclose_ticks && 1765 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1766 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1767 NULL); 1768 } 1769 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1770 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1771 1772 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1773 /* 1774 * Ok the peer probably discarded our data (if we 1775 * echoed a cookie+data). So anything on the 1776 * sent_queue should be marked for retransmit, we 1777 * may not get something to kick us so it COULD 1778 * still take a timeout to move these.. but it can't 1779 * hurt to mark them. 1780 */ 1781 struct sctp_tmit_chunk *chk; 1782 1783 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1784 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1785 chk->sent = SCTP_DATAGRAM_RESEND; 1786 sctp_flight_size_decrease(chk); 1787 sctp_total_flight_decrease(stcb, chk); 1788 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1789 spec_flag++; 1790 } 1791 } 1792 1793 } 1794 /* process the INIT info (peer's info) */ 1795 retval = sctp_process_init(init_cp, stcb); 1796 if (retval < 0) { 1797 if (how_indx < sizeof(asoc->cookie_how)) 1798 asoc->cookie_how[how_indx] = 9; 1799 return (NULL); 1800 } 1801 if (sctp_load_addresses_from_init(stcb, m, 1802 init_offset + sizeof(struct sctp_init_chunk), 1803 initack_offset, src, dst, init_src)) { 1804 if (how_indx < sizeof(asoc->cookie_how)) 1805 asoc->cookie_how[how_indx] = 10; 1806 return (NULL); 1807 } 1808 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1809 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1810 *notification = SCTP_NOTIFY_ASSOC_UP; 1811 1812 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1813 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1814 (inp->sctp_socket->so_qlimit == 0)) { 1815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1816 struct socket *so; 1817 1818 #endif 1819 stcb->sctp_ep->sctp_flags |= 1820 SCTP_PCB_FLAGS_CONNECTED; 1821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1822 so = SCTP_INP_SO(stcb->sctp_ep); 1823 atomic_add_int(&stcb->asoc.refcnt, 1); 1824 SCTP_TCB_UNLOCK(stcb); 1825 SCTP_SOCKET_LOCK(so, 1); 1826 SCTP_TCB_LOCK(stcb); 1827 atomic_add_int(&stcb->asoc.refcnt, -1); 1828 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1829 SCTP_SOCKET_UNLOCK(so, 1); 1830 return (NULL); 1831 } 1832 #endif 1833 soisconnected(stcb->sctp_socket); 1834 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1835 SCTP_SOCKET_UNLOCK(so, 1); 1836 #endif 1837 } 1838 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1839 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1840 else 1841 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1842 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1843 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1844 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1845 } else { 1846 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1847 } 1848 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1849 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1850 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1851 stcb->sctp_ep, stcb, asoc->primary_destination); 1852 } 1853 sctp_stop_all_cookie_timers(stcb); 1854 sctp_toss_old_cookies(stcb, asoc); 1855 sctp_send_cookie_ack(stcb); 1856 if (spec_flag) { 1857 /* 1858 * only if we have retrans set do we do this. What 1859 * this call does is get only the COOKIE-ACK out and 1860 * then when we return the normal call to 1861 * sctp_chunk_output will get the retrans out behind 1862 * this. 1863 */ 1864 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1865 } 1866 if (how_indx < sizeof(asoc->cookie_how)) 1867 asoc->cookie_how[how_indx] = 11; 1868 1869 return (stcb); 1870 } 1871 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1872 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1873 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1874 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1875 cookie->tie_tag_peer_vtag != 0) { 1876 struct sctpasochead *head; 1877 1878 if (asoc->peer_supports_nat) { 1879 /* 1880 * This is a gross gross hack. just call the 1881 * cookie_new code since we are allowing a duplicate 1882 * association. I hope this works... 1883 */ 1884 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1885 sh, cookie, cookie_len, 1886 inp, netp, init_src, notification, 1887 auth_skipped, auth_offset, auth_len, 1888 use_mflowid, mflowid, 1889 vrf_id, port)); 1890 } 1891 /* 1892 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1893 */ 1894 /* temp code */ 1895 if (how_indx < sizeof(asoc->cookie_how)) 1896 asoc->cookie_how[how_indx] = 12; 1897 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1898 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1899 1900 /* notify upper layer */ 1901 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1902 atomic_add_int(&stcb->asoc.refcnt, 1); 1903 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1904 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1905 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1906 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1907 } 1908 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1909 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1910 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1911 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1912 } 1913 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1914 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1915 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1916 stcb->sctp_ep, stcb, asoc->primary_destination); 1917 1918 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1919 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1920 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1921 } 1922 asoc->pre_open_streams = 1923 ntohs(initack_cp->init.num_outbound_streams); 1924 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1925 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1926 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1927 1928 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1929 1930 asoc->str_reset_seq_in = asoc->init_seq_number; 1931 1932 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1933 if (asoc->mapping_array) { 1934 memset(asoc->mapping_array, 0, 1935 asoc->mapping_array_size); 1936 } 1937 if (asoc->nr_mapping_array) { 1938 memset(asoc->nr_mapping_array, 0, 1939 asoc->mapping_array_size); 1940 } 1941 SCTP_TCB_UNLOCK(stcb); 1942 SCTP_INP_INFO_WLOCK(); 1943 SCTP_INP_WLOCK(stcb->sctp_ep); 1944 SCTP_TCB_LOCK(stcb); 1945 atomic_add_int(&stcb->asoc.refcnt, -1); 1946 /* send up all the data */ 1947 SCTP_TCB_SEND_LOCK(stcb); 1948 1949 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1950 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1951 stcb->asoc.strmout[i].chunks_on_queues = 0; 1952 stcb->asoc.strmout[i].stream_no = i; 1953 stcb->asoc.strmout[i].next_sequence_send = 0; 1954 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1955 } 1956 /* process the INIT-ACK info (my info) */ 1957 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1958 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1959 1960 /* pull from vtag hash */ 1961 LIST_REMOVE(stcb, sctp_asocs); 1962 /* re-insert to new vtag position */ 1963 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1964 SCTP_BASE_INFO(hashasocmark))]; 1965 /* 1966 * put it in the bucket in the vtag hash of assoc's for the 1967 * system 1968 */ 1969 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1970 1971 /* process the INIT info (peer's info) */ 1972 SCTP_TCB_SEND_UNLOCK(stcb); 1973 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1974 SCTP_INP_INFO_WUNLOCK(); 1975 1976 retval = sctp_process_init(init_cp, stcb); 1977 if (retval < 0) { 1978 if (how_indx < sizeof(asoc->cookie_how)) 1979 asoc->cookie_how[how_indx] = 13; 1980 1981 return (NULL); 1982 } 1983 /* 1984 * since we did not send a HB make sure we don't double 1985 * things 1986 */ 1987 net->hb_responded = 1; 1988 1989 if (sctp_load_addresses_from_init(stcb, m, 1990 init_offset + sizeof(struct sctp_init_chunk), 1991 initack_offset, src, dst, init_src)) { 1992 if (how_indx < sizeof(asoc->cookie_how)) 1993 asoc->cookie_how[how_indx] = 14; 1994 1995 return (NULL); 1996 } 1997 /* respond with a COOKIE-ACK */ 1998 sctp_stop_all_cookie_timers(stcb); 1999 sctp_toss_old_cookies(stcb, asoc); 2000 sctp_send_cookie_ack(stcb); 2001 if (how_indx < sizeof(asoc->cookie_how)) 2002 asoc->cookie_how[how_indx] = 15; 2003 2004 return (stcb); 2005 } 2006 if (how_indx < sizeof(asoc->cookie_how)) 2007 asoc->cookie_how[how_indx] = 16; 2008 /* all other cases... */ 2009 return (NULL); 2010 } 2011 2012 2013 /* 2014 * handle a state cookie for a new association m: input packet mbuf chain-- 2015 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2016 * and the cookie signature does not exist offset: offset into mbuf to the 2017 * cookie-echo chunk length: length of the cookie chunk to: where the init 2018 * was from returns a new TCB 2019 */ 2020 static struct sctp_tcb * 2021 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2022 struct sockaddr *src, struct sockaddr *dst, 2023 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2024 struct sctp_inpcb *inp, struct sctp_nets **netp, 2025 struct sockaddr *init_src, int *notification, 2026 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2027 uint8_t use_mflowid, uint32_t mflowid, 2028 uint32_t vrf_id, uint16_t port) 2029 { 2030 struct sctp_tcb *stcb; 2031 struct sctp_init_chunk *init_cp, init_buf; 2032 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2033 struct sockaddr_storage sa_store; 2034 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2035 struct sctp_association *asoc; 2036 int init_offset, initack_offset, initack_limit; 2037 int retval; 2038 int error = 0; 2039 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2040 2041 #ifdef INET 2042 struct sockaddr_in *sin; 2043 2044 #endif 2045 #ifdef INET6 2046 struct sockaddr_in6 *sin6; 2047 2048 #endif 2049 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2050 struct socket *so; 2051 2052 so = SCTP_INP_SO(inp); 2053 #endif 2054 2055 /* 2056 * find and validate the INIT chunk in the cookie (peer's info) the 2057 * INIT should start after the cookie-echo header struct (chunk 2058 * header, state cookie header struct) 2059 */ 2060 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2061 init_cp = (struct sctp_init_chunk *) 2062 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2063 (uint8_t *) & init_buf); 2064 if (init_cp == NULL) { 2065 /* could not pull a INIT chunk in cookie */ 2066 SCTPDBG(SCTP_DEBUG_INPUT1, 2067 "process_cookie_new: could not pull INIT chunk hdr\n"); 2068 return (NULL); 2069 } 2070 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2071 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2072 return (NULL); 2073 } 2074 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2075 /* 2076 * find and validate the INIT-ACK chunk in the cookie (my info) the 2077 * INIT-ACK follows the INIT chunk 2078 */ 2079 initack_cp = (struct sctp_init_ack_chunk *) 2080 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2081 (uint8_t *) & initack_buf); 2082 if (initack_cp == NULL) { 2083 /* could not pull INIT-ACK chunk in cookie */ 2084 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2085 return (NULL); 2086 } 2087 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2088 return (NULL); 2089 } 2090 /* 2091 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2092 * "initack_limit" value. This is because the chk_length field 2093 * includes the length of the cookie, but the cookie is omitted when 2094 * the INIT and INIT_ACK are tacked onto the cookie... 2095 */ 2096 initack_limit = offset + cookie_len; 2097 2098 /* 2099 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2100 * and popluate 2101 */ 2102 2103 /* 2104 * Here we do a trick, we set in NULL for the proc/thread argument. 2105 * We do this since in effect we only use the p argument when the 2106 * socket is unbound and we must do an implicit bind. Since we are 2107 * getting a cookie, we cannot be unbound. 2108 */ 2109 stcb = sctp_aloc_assoc(inp, init_src, &error, 2110 ntohl(initack_cp->init.initiate_tag), vrf_id, 2111 (struct thread *)NULL 2112 ); 2113 if (stcb == NULL) { 2114 struct mbuf *op_err; 2115 2116 /* memory problem? */ 2117 SCTPDBG(SCTP_DEBUG_INPUT1, 2118 "process_cookie_new: no room for another TCB!\n"); 2119 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2120 2121 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2122 src, dst, sh, op_err, 2123 use_mflowid, mflowid, 2124 vrf_id, port); 2125 return (NULL); 2126 } 2127 /* get the correct sctp_nets */ 2128 if (netp) 2129 *netp = sctp_findnet(stcb, init_src); 2130 2131 asoc = &stcb->asoc; 2132 /* get scope variables out of cookie */ 2133 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2134 asoc->scope.site_scope = cookie->site_scope; 2135 asoc->scope.local_scope = cookie->local_scope; 2136 asoc->scope.loopback_scope = cookie->loopback_scope; 2137 2138 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2139 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2140 struct mbuf *op_err; 2141 2142 /* 2143 * Houston we have a problem. The EP changed while the 2144 * cookie was in flight. Only recourse is to abort the 2145 * association. 2146 */ 2147 atomic_add_int(&stcb->asoc.refcnt, 1); 2148 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2149 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2150 src, dst, sh, op_err, 2151 use_mflowid, mflowid, 2152 vrf_id, port); 2153 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2154 SCTP_TCB_UNLOCK(stcb); 2155 SCTP_SOCKET_LOCK(so, 1); 2156 SCTP_TCB_LOCK(stcb); 2157 #endif 2158 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2159 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2160 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2161 SCTP_SOCKET_UNLOCK(so, 1); 2162 #endif 2163 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2164 return (NULL); 2165 } 2166 /* process the INIT-ACK info (my info) */ 2167 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2168 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2169 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2170 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2171 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2172 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2173 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2174 asoc->str_reset_seq_in = asoc->init_seq_number; 2175 2176 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2177 2178 /* process the INIT info (peer's info) */ 2179 if (netp) 2180 retval = sctp_process_init(init_cp, stcb); 2181 else 2182 retval = 0; 2183 if (retval < 0) { 2184 atomic_add_int(&stcb->asoc.refcnt, 1); 2185 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2186 SCTP_TCB_UNLOCK(stcb); 2187 SCTP_SOCKET_LOCK(so, 1); 2188 SCTP_TCB_LOCK(stcb); 2189 #endif 2190 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2192 SCTP_SOCKET_UNLOCK(so, 1); 2193 #endif 2194 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2195 return (NULL); 2196 } 2197 /* load all addresses */ 2198 if (sctp_load_addresses_from_init(stcb, m, 2199 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2200 src, dst, init_src)) { 2201 atomic_add_int(&stcb->asoc.refcnt, 1); 2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2203 SCTP_TCB_UNLOCK(stcb); 2204 SCTP_SOCKET_LOCK(so, 1); 2205 SCTP_TCB_LOCK(stcb); 2206 #endif 2207 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2209 SCTP_SOCKET_UNLOCK(so, 1); 2210 #endif 2211 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2212 return (NULL); 2213 } 2214 /* 2215 * verify any preceding AUTH chunk that was skipped 2216 */ 2217 /* pull the local authentication parameters from the cookie/init-ack */ 2218 sctp_auth_get_cookie_params(stcb, m, 2219 initack_offset + sizeof(struct sctp_init_ack_chunk), 2220 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2221 if (auth_skipped) { 2222 struct sctp_auth_chunk *auth; 2223 2224 auth = (struct sctp_auth_chunk *) 2225 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2226 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2227 /* auth HMAC failed, dump the assoc and packet */ 2228 SCTPDBG(SCTP_DEBUG_AUTH1, 2229 "COOKIE-ECHO: AUTH failed\n"); 2230 atomic_add_int(&stcb->asoc.refcnt, 1); 2231 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2232 SCTP_TCB_UNLOCK(stcb); 2233 SCTP_SOCKET_LOCK(so, 1); 2234 SCTP_TCB_LOCK(stcb); 2235 #endif 2236 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2238 SCTP_SOCKET_UNLOCK(so, 1); 2239 #endif 2240 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2241 return (NULL); 2242 } else { 2243 /* remaining chunks checked... good to go */ 2244 stcb->asoc.authenticated = 1; 2245 } 2246 } 2247 /* update current state */ 2248 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2249 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2250 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2251 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2252 stcb->sctp_ep, stcb, asoc->primary_destination); 2253 } 2254 sctp_stop_all_cookie_timers(stcb); 2255 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2256 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2257 2258 /* 2259 * if we're doing ASCONFs, check to see if we have any new local 2260 * addresses that need to get added to the peer (eg. addresses 2261 * changed while cookie echo in flight). This needs to be done 2262 * after we go to the OPEN state to do the correct asconf 2263 * processing. else, make sure we have the correct addresses in our 2264 * lists 2265 */ 2266 2267 /* warning, we re-use sin, sin6, sa_store here! */ 2268 /* pull in local_address (our "from" address) */ 2269 switch (cookie->laddr_type) { 2270 #ifdef INET 2271 case SCTP_IPV4_ADDRESS: 2272 /* source addr is IPv4 */ 2273 sin = (struct sockaddr_in *)initack_src; 2274 memset(sin, 0, sizeof(*sin)); 2275 sin->sin_family = AF_INET; 2276 sin->sin_len = sizeof(struct sockaddr_in); 2277 sin->sin_addr.s_addr = cookie->laddress[0]; 2278 break; 2279 #endif 2280 #ifdef INET6 2281 case SCTP_IPV6_ADDRESS: 2282 /* source addr is IPv6 */ 2283 sin6 = (struct sockaddr_in6 *)initack_src; 2284 memset(sin6, 0, sizeof(*sin6)); 2285 sin6->sin6_family = AF_INET6; 2286 sin6->sin6_len = sizeof(struct sockaddr_in6); 2287 sin6->sin6_scope_id = cookie->scope_id; 2288 memcpy(&sin6->sin6_addr, cookie->laddress, 2289 sizeof(sin6->sin6_addr)); 2290 break; 2291 #endif 2292 default: 2293 atomic_add_int(&stcb->asoc.refcnt, 1); 2294 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2295 SCTP_TCB_UNLOCK(stcb); 2296 SCTP_SOCKET_LOCK(so, 1); 2297 SCTP_TCB_LOCK(stcb); 2298 #endif 2299 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2300 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2301 SCTP_SOCKET_UNLOCK(so, 1); 2302 #endif 2303 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2304 return (NULL); 2305 } 2306 2307 /* set up to notify upper layer */ 2308 *notification = SCTP_NOTIFY_ASSOC_UP; 2309 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2310 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2311 (inp->sctp_socket->so_qlimit == 0)) { 2312 /* 2313 * This is an endpoint that called connect() how it got a 2314 * cookie that is NEW is a bit of a mystery. It must be that 2315 * the INIT was sent, but before it got there.. a complete 2316 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2317 * should have went to the other code.. not here.. oh well.. 2318 * a bit of protection is worth having.. 2319 */ 2320 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2321 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2322 atomic_add_int(&stcb->asoc.refcnt, 1); 2323 SCTP_TCB_UNLOCK(stcb); 2324 SCTP_SOCKET_LOCK(so, 1); 2325 SCTP_TCB_LOCK(stcb); 2326 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2327 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2328 SCTP_SOCKET_UNLOCK(so, 1); 2329 return (NULL); 2330 } 2331 #endif 2332 soisconnected(stcb->sctp_socket); 2333 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2334 SCTP_SOCKET_UNLOCK(so, 1); 2335 #endif 2336 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2337 (inp->sctp_socket->so_qlimit)) { 2338 /* 2339 * We don't want to do anything with this one. Since it is 2340 * the listening guy. The timer will get started for 2341 * accepted connections in the caller. 2342 */ 2343 ; 2344 } 2345 /* since we did not send a HB make sure we don't double things */ 2346 if ((netp) && (*netp)) 2347 (*netp)->hb_responded = 1; 2348 2349 if (stcb->asoc.sctp_autoclose_ticks && 2350 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2351 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2352 } 2353 /* calculate the RTT */ 2354 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2355 if ((netp) && (*netp)) { 2356 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2357 &cookie->time_entered, sctp_align_unsafe_makecopy, 2358 SCTP_RTT_FROM_NON_DATA); 2359 } 2360 /* respond with a COOKIE-ACK */ 2361 sctp_send_cookie_ack(stcb); 2362 2363 /* 2364 * check the address lists for any ASCONFs that need to be sent 2365 * AFTER the cookie-ack is sent 2366 */ 2367 sctp_check_address_list(stcb, m, 2368 initack_offset + sizeof(struct sctp_init_ack_chunk), 2369 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2370 initack_src, cookie->local_scope, cookie->site_scope, 2371 cookie->ipv4_scope, cookie->loopback_scope); 2372 2373 2374 return (stcb); 2375 } 2376 2377 /* 2378 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2379 * we NEED to make sure we are not already using the vtag. If so we 2380 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2381 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2382 SCTP_BASE_INFO(hashasocmark))]; 2383 LIST_FOREACH(stcb, head, sctp_asocs) { 2384 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2385 -- SEND ABORT - TRY AGAIN -- 2386 } 2387 } 2388 */ 2389 2390 /* 2391 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2392 * existing (non-NULL) TCB 2393 */ 2394 static struct mbuf * 2395 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2396 struct sockaddr *src, struct sockaddr *dst, 2397 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2398 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2399 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2400 struct sctp_tcb **locked_tcb, 2401 uint8_t use_mflowid, uint32_t mflowid, 2402 uint32_t vrf_id, uint16_t port) 2403 { 2404 struct sctp_state_cookie *cookie; 2405 struct sctp_tcb *l_stcb = *stcb; 2406 struct sctp_inpcb *l_inp; 2407 struct sockaddr *to; 2408 struct sctp_pcb *ep; 2409 struct mbuf *m_sig; 2410 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2411 uint8_t *sig; 2412 uint8_t cookie_ok = 0; 2413 unsigned int sig_offset, cookie_offset; 2414 unsigned int cookie_len; 2415 struct timeval now; 2416 struct timeval time_expires; 2417 int notification = 0; 2418 struct sctp_nets *netl; 2419 int had_a_existing_tcb = 0; 2420 int send_int_conf = 0; 2421 2422 #ifdef INET 2423 struct sockaddr_in sin; 2424 2425 #endif 2426 #ifdef INET6 2427 struct sockaddr_in6 sin6; 2428 2429 #endif 2430 2431 SCTPDBG(SCTP_DEBUG_INPUT2, 2432 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2433 2434 if (inp_p == NULL) { 2435 return (NULL); 2436 } 2437 cookie = &cp->cookie; 2438 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2439 cookie_len = ntohs(cp->ch.chunk_length); 2440 2441 if ((cookie->peerport != sh->src_port) && 2442 (cookie->myport != sh->dest_port) && 2443 (cookie->my_vtag != sh->v_tag)) { 2444 /* 2445 * invalid ports or bad tag. Note that we always leave the 2446 * v_tag in the header in network order and when we stored 2447 * it in the my_vtag slot we also left it in network order. 2448 * This maintains the match even though it may be in the 2449 * opposite byte order of the machine :-> 2450 */ 2451 return (NULL); 2452 } 2453 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2454 sizeof(struct sctp_init_chunk) + 2455 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2456 /* cookie too small */ 2457 return (NULL); 2458 } 2459 /* 2460 * split off the signature into its own mbuf (since it should not be 2461 * calculated in the sctp_hmac_m() call). 2462 */ 2463 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2464 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2465 if (m_sig == NULL) { 2466 /* out of memory or ?? */ 2467 return (NULL); 2468 } 2469 #ifdef SCTP_MBUF_LOGGING 2470 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2471 struct mbuf *mat; 2472 2473 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2474 if (SCTP_BUF_IS_EXTENDED(mat)) { 2475 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2476 } 2477 } 2478 } 2479 #endif 2480 2481 /* 2482 * compute the signature/digest for the cookie 2483 */ 2484 ep = &(*inp_p)->sctp_ep; 2485 l_inp = *inp_p; 2486 if (l_stcb) { 2487 SCTP_TCB_UNLOCK(l_stcb); 2488 } 2489 SCTP_INP_RLOCK(l_inp); 2490 if (l_stcb) { 2491 SCTP_TCB_LOCK(l_stcb); 2492 } 2493 /* which cookie is it? */ 2494 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2495 (ep->current_secret_number != ep->last_secret_number)) { 2496 /* it's the old cookie */ 2497 (void)sctp_hmac_m(SCTP_HMAC, 2498 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2499 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2500 } else { 2501 /* it's the current cookie */ 2502 (void)sctp_hmac_m(SCTP_HMAC, 2503 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2504 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2505 } 2506 /* get the signature */ 2507 SCTP_INP_RUNLOCK(l_inp); 2508 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2509 if (sig == NULL) { 2510 /* couldn't find signature */ 2511 sctp_m_freem(m_sig); 2512 return (NULL); 2513 } 2514 /* compare the received digest with the computed digest */ 2515 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2516 /* try the old cookie? */ 2517 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2518 (ep->current_secret_number != ep->last_secret_number)) { 2519 /* compute digest with old */ 2520 (void)sctp_hmac_m(SCTP_HMAC, 2521 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2522 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2523 /* compare */ 2524 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2525 cookie_ok = 1; 2526 } 2527 } else { 2528 cookie_ok = 1; 2529 } 2530 2531 /* 2532 * Now before we continue we must reconstruct our mbuf so that 2533 * normal processing of any other chunks will work. 2534 */ 2535 { 2536 struct mbuf *m_at; 2537 2538 m_at = m; 2539 while (SCTP_BUF_NEXT(m_at) != NULL) { 2540 m_at = SCTP_BUF_NEXT(m_at); 2541 } 2542 SCTP_BUF_NEXT(m_at) = m_sig; 2543 } 2544 2545 if (cookie_ok == 0) { 2546 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2547 SCTPDBG(SCTP_DEBUG_INPUT2, 2548 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2549 (uint32_t) offset, cookie_offset, sig_offset); 2550 return (NULL); 2551 } 2552 /* 2553 * check the cookie timestamps to be sure it's not stale 2554 */ 2555 (void)SCTP_GETTIME_TIMEVAL(&now); 2556 /* Expire time is in Ticks, so we convert to seconds */ 2557 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2558 time_expires.tv_usec = cookie->time_entered.tv_usec; 2559 /* 2560 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2561 * is undefined. 2562 */ 2563 if (timevalcmp(&now, &time_expires, >)) { 2564 /* cookie is stale! */ 2565 struct mbuf *op_err; 2566 struct sctp_stale_cookie_msg *scm; 2567 uint32_t tim; 2568 2569 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2570 0, M_DONTWAIT, 1, MT_DATA); 2571 if (op_err == NULL) { 2572 /* FOOBAR */ 2573 return (NULL); 2574 } 2575 /* Set the len */ 2576 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2577 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2578 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2579 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2580 (sizeof(uint32_t)))); 2581 /* seconds to usec */ 2582 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2583 /* add in usec */ 2584 if (tim == 0) 2585 tim = now.tv_usec - cookie->time_entered.tv_usec; 2586 scm->time_usec = htonl(tim); 2587 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2588 use_mflowid, mflowid, 2589 vrf_id, port); 2590 return (NULL); 2591 } 2592 /* 2593 * Now we must see with the lookup address if we have an existing 2594 * asoc. This will only happen if we were in the COOKIE-WAIT state 2595 * and a INIT collided with us and somewhere the peer sent the 2596 * cookie on another address besides the single address our assoc 2597 * had for him. In this case we will have one of the tie-tags set at 2598 * least AND the address field in the cookie can be used to look it 2599 * up. 2600 */ 2601 to = NULL; 2602 switch (cookie->addr_type) { 2603 #ifdef INET6 2604 case SCTP_IPV6_ADDRESS: 2605 memset(&sin6, 0, sizeof(sin6)); 2606 sin6.sin6_family = AF_INET6; 2607 sin6.sin6_len = sizeof(sin6); 2608 sin6.sin6_port = sh->src_port; 2609 sin6.sin6_scope_id = cookie->scope_id; 2610 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2611 sizeof(sin6.sin6_addr.s6_addr)); 2612 to = (struct sockaddr *)&sin6; 2613 break; 2614 #endif 2615 #ifdef INET 2616 case SCTP_IPV4_ADDRESS: 2617 memset(&sin, 0, sizeof(sin)); 2618 sin.sin_family = AF_INET; 2619 sin.sin_len = sizeof(sin); 2620 sin.sin_port = sh->src_port; 2621 sin.sin_addr.s_addr = cookie->address[0]; 2622 to = (struct sockaddr *)&sin; 2623 break; 2624 #endif 2625 default: 2626 /* This should not happen */ 2627 return (NULL); 2628 } 2629 if ((*stcb == NULL) && to) { 2630 /* Yep, lets check */ 2631 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2632 if (*stcb == NULL) { 2633 /* 2634 * We should have only got back the same inp. If we 2635 * got back a different ep we have a problem. The 2636 * original findep got back l_inp and now 2637 */ 2638 if (l_inp != *inp_p) { 2639 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2640 } 2641 } else { 2642 if (*locked_tcb == NULL) { 2643 /* 2644 * In this case we found the assoc only 2645 * after we locked the create lock. This 2646 * means we are in a colliding case and we 2647 * must make sure that we unlock the tcb if 2648 * its one of the cases where we throw away 2649 * the incoming packets. 2650 */ 2651 *locked_tcb = *stcb; 2652 2653 /* 2654 * We must also increment the inp ref count 2655 * since the ref_count flags was set when we 2656 * did not find the TCB, now we found it 2657 * which reduces the refcount.. we must 2658 * raise it back out to balance it all :-) 2659 */ 2660 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2661 if ((*stcb)->sctp_ep != l_inp) { 2662 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2663 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2664 } 2665 } 2666 } 2667 } 2668 if (to == NULL) { 2669 return (NULL); 2670 } 2671 cookie_len -= SCTP_SIGNATURE_SIZE; 2672 if (*stcb == NULL) { 2673 /* this is the "normal" case... get a new TCB */ 2674 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2675 cookie, cookie_len, *inp_p, 2676 netp, to, ¬ification, 2677 auth_skipped, auth_offset, auth_len, 2678 use_mflowid, mflowid, 2679 vrf_id, port); 2680 } else { 2681 /* this is abnormal... cookie-echo on existing TCB */ 2682 had_a_existing_tcb = 1; 2683 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2684 src, dst, sh, 2685 cookie, cookie_len, *inp_p, *stcb, netp, to, 2686 ¬ification, auth_skipped, auth_offset, auth_len, 2687 use_mflowid, mflowid, 2688 vrf_id, port); 2689 } 2690 2691 if (*stcb == NULL) { 2692 /* still no TCB... must be bad cookie-echo */ 2693 return (NULL); 2694 } 2695 if ((*netp != NULL) && (use_mflowid != 0)) { 2696 (*netp)->flowid = mflowid; 2697 #ifdef INVARIANTS 2698 (*netp)->flowidset = 1; 2699 #endif 2700 } 2701 /* 2702 * Ok, we built an association so confirm the address we sent the 2703 * INIT-ACK to. 2704 */ 2705 netl = sctp_findnet(*stcb, to); 2706 /* 2707 * This code should in theory NOT run but 2708 */ 2709 if (netl == NULL) { 2710 /* TSNH! Huh, why do I need to add this address here? */ 2711 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2712 return (NULL); 2713 } 2714 netl = sctp_findnet(*stcb, to); 2715 } 2716 if (netl) { 2717 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2718 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2719 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2720 netl); 2721 send_int_conf = 1; 2722 } 2723 } 2724 sctp_start_net_timers(*stcb); 2725 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2726 if (!had_a_existing_tcb || 2727 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2728 /* 2729 * If we have a NEW cookie or the connect never 2730 * reached the connected state during collision we 2731 * must do the TCP accept thing. 2732 */ 2733 struct socket *so, *oso; 2734 struct sctp_inpcb *inp; 2735 2736 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2737 /* 2738 * For a restart we will keep the same 2739 * socket, no need to do anything. I THINK!! 2740 */ 2741 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2742 if (send_int_conf) { 2743 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2744 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2745 } 2746 return (m); 2747 } 2748 oso = (*inp_p)->sctp_socket; 2749 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2750 SCTP_TCB_UNLOCK((*stcb)); 2751 CURVNET_SET(oso->so_vnet); 2752 so = sonewconn(oso, 0 2753 ); 2754 CURVNET_RESTORE(); 2755 SCTP_TCB_LOCK((*stcb)); 2756 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2757 2758 if (so == NULL) { 2759 struct mbuf *op_err; 2760 2761 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2762 struct socket *pcb_so; 2763 2764 #endif 2765 /* Too many sockets */ 2766 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2767 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2768 sctp_abort_association(*inp_p, NULL, m, iphlen, 2769 src, dst, sh, op_err, 2770 use_mflowid, mflowid, 2771 vrf_id, port); 2772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2773 pcb_so = SCTP_INP_SO(*inp_p); 2774 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2775 SCTP_TCB_UNLOCK((*stcb)); 2776 SCTP_SOCKET_LOCK(pcb_so, 1); 2777 SCTP_TCB_LOCK((*stcb)); 2778 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2779 #endif 2780 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2782 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2783 #endif 2784 return (NULL); 2785 } 2786 inp = (struct sctp_inpcb *)so->so_pcb; 2787 SCTP_INP_INCR_REF(inp); 2788 /* 2789 * We add the unbound flag here so that if we get an 2790 * soabort() before we get the move_pcb done, we 2791 * will properly cleanup. 2792 */ 2793 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2794 SCTP_PCB_FLAGS_CONNECTED | 2795 SCTP_PCB_FLAGS_IN_TCPPOOL | 2796 SCTP_PCB_FLAGS_UNBOUND | 2797 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2798 SCTP_PCB_FLAGS_DONT_WAKE); 2799 inp->sctp_features = (*inp_p)->sctp_features; 2800 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2801 inp->sctp_socket = so; 2802 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2803 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2804 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2805 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2806 inp->sctp_context = (*inp_p)->sctp_context; 2807 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2808 inp->inp_starting_point_for_iterator = NULL; 2809 /* 2810 * copy in the authentication parameters from the 2811 * original endpoint 2812 */ 2813 if (inp->sctp_ep.local_hmacs) 2814 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2815 inp->sctp_ep.local_hmacs = 2816 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2817 if (inp->sctp_ep.local_auth_chunks) 2818 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2819 inp->sctp_ep.local_auth_chunks = 2820 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2821 2822 /* 2823 * Now we must move it from one hash table to 2824 * another and get the tcb in the right place. 2825 */ 2826 2827 /* 2828 * This is where the one-2-one socket is put into 2829 * the accept state waiting for the accept! 2830 */ 2831 if (*stcb) { 2832 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2833 } 2834 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2835 2836 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2837 SCTP_TCB_UNLOCK((*stcb)); 2838 2839 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2840 0); 2841 SCTP_TCB_LOCK((*stcb)); 2842 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2843 2844 2845 /* 2846 * now we must check to see if we were aborted while 2847 * the move was going on and the lock/unlock 2848 * happened. 2849 */ 2850 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2851 /* 2852 * yep it was, we leave the assoc attached 2853 * to the socket since the sctp_inpcb_free() 2854 * call will send an abort for us. 2855 */ 2856 SCTP_INP_DECR_REF(inp); 2857 return (NULL); 2858 } 2859 SCTP_INP_DECR_REF(inp); 2860 /* Switch over to the new guy */ 2861 *inp_p = inp; 2862 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2863 if (send_int_conf) { 2864 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2865 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2866 } 2867 /* 2868 * Pull it from the incomplete queue and wake the 2869 * guy 2870 */ 2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2872 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2873 SCTP_TCB_UNLOCK((*stcb)); 2874 SCTP_SOCKET_LOCK(so, 1); 2875 #endif 2876 soisconnected(so); 2877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2878 SCTP_TCB_LOCK((*stcb)); 2879 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2880 SCTP_SOCKET_UNLOCK(so, 1); 2881 #endif 2882 return (m); 2883 } 2884 } 2885 if (notification) { 2886 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2887 } 2888 if (send_int_conf) { 2889 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2890 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2891 } 2892 return (m); 2893 } 2894 2895 static void 2896 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2897 struct sctp_tcb *stcb, struct sctp_nets *net) 2898 { 2899 /* cp must not be used, others call this without a c-ack :-) */ 2900 struct sctp_association *asoc; 2901 2902 SCTPDBG(SCTP_DEBUG_INPUT2, 2903 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2904 if (stcb == NULL) 2905 return; 2906 2907 asoc = &stcb->asoc; 2908 2909 sctp_stop_all_cookie_timers(stcb); 2910 /* process according to association state */ 2911 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2912 /* state change only needed when I am in right state */ 2913 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2914 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2915 sctp_start_net_timers(stcb); 2916 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2917 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2918 stcb->sctp_ep, stcb, asoc->primary_destination); 2919 2920 } 2921 /* update RTO */ 2922 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2923 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2924 if (asoc->overall_error_count == 0) { 2925 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2926 &asoc->time_entered, sctp_align_safe_nocopy, 2927 SCTP_RTT_FROM_NON_DATA); 2928 } 2929 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2930 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2931 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2932 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2934 struct socket *so; 2935 2936 #endif 2937 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2938 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2939 so = SCTP_INP_SO(stcb->sctp_ep); 2940 atomic_add_int(&stcb->asoc.refcnt, 1); 2941 SCTP_TCB_UNLOCK(stcb); 2942 SCTP_SOCKET_LOCK(so, 1); 2943 SCTP_TCB_LOCK(stcb); 2944 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2945 #endif 2946 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2947 soisconnected(stcb->sctp_socket); 2948 } 2949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2950 SCTP_SOCKET_UNLOCK(so, 1); 2951 #endif 2952 } 2953 /* 2954 * since we did not send a HB make sure we don't double 2955 * things 2956 */ 2957 net->hb_responded = 1; 2958 2959 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2960 /* 2961 * We don't need to do the asconf thing, nor hb or 2962 * autoclose if the socket is closed. 2963 */ 2964 goto closed_socket; 2965 } 2966 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2967 stcb, net); 2968 2969 2970 if (stcb->asoc.sctp_autoclose_ticks && 2971 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2972 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2973 stcb->sctp_ep, stcb, NULL); 2974 } 2975 /* 2976 * send ASCONF if parameters are pending and ASCONFs are 2977 * allowed (eg. addresses changed when init/cookie echo were 2978 * in flight) 2979 */ 2980 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2981 (stcb->asoc.peer_supports_asconf) && 2982 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2983 #ifdef SCTP_TIMER_BASED_ASCONF 2984 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2985 stcb->sctp_ep, stcb, 2986 stcb->asoc.primary_destination); 2987 #else 2988 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2989 SCTP_ADDR_NOT_LOCKED); 2990 #endif 2991 } 2992 } 2993 closed_socket: 2994 /* Toss the cookie if I can */ 2995 sctp_toss_old_cookies(stcb, asoc); 2996 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2997 /* Restart the timer if we have pending data */ 2998 struct sctp_tmit_chunk *chk; 2999 3000 chk = TAILQ_FIRST(&asoc->sent_queue); 3001 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3002 } 3003 } 3004 3005 static void 3006 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3007 struct sctp_tcb *stcb) 3008 { 3009 struct sctp_nets *net; 3010 struct sctp_tmit_chunk *lchk; 3011 struct sctp_ecne_chunk bkup; 3012 uint8_t override_bit; 3013 uint32_t tsn, window_data_tsn; 3014 int len; 3015 unsigned int pkt_cnt; 3016 3017 len = ntohs(cp->ch.chunk_length); 3018 if ((len != sizeof(struct sctp_ecne_chunk)) && 3019 (len != sizeof(struct old_sctp_ecne_chunk))) { 3020 return; 3021 } 3022 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3023 /* Its the old format */ 3024 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3025 bkup.num_pkts_since_cwr = htonl(1); 3026 cp = &bkup; 3027 } 3028 SCTP_STAT_INCR(sctps_recvecne); 3029 tsn = ntohl(cp->tsn); 3030 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3031 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3032 if (lchk == NULL) { 3033 window_data_tsn = stcb->asoc.sending_seq - 1; 3034 } else { 3035 window_data_tsn = lchk->rec.data.TSN_seq; 3036 } 3037 3038 /* Find where it was sent to if possible. */ 3039 net = NULL; 3040 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3041 if (lchk->rec.data.TSN_seq == tsn) { 3042 net = lchk->whoTo; 3043 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3044 break; 3045 } 3046 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3047 break; 3048 } 3049 } 3050 if (net == NULL) { 3051 /* 3052 * What to do. A previous send of a CWR was possibly lost. 3053 * See how old it is, we may have it marked on the actual 3054 * net. 3055 */ 3056 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3057 if (tsn == net->last_cwr_tsn) { 3058 /* Found him, send it off */ 3059 break; 3060 } 3061 } 3062 if (net == NULL) { 3063 /* 3064 * If we reach here, we need to send a special CWR 3065 * that says hey, we did this a long time ago and 3066 * you lost the response. 3067 */ 3068 net = TAILQ_FIRST(&stcb->asoc.nets); 3069 if (net == NULL) { 3070 /* TSNH */ 3071 return; 3072 } 3073 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3074 } else { 3075 override_bit = 0; 3076 } 3077 } else { 3078 override_bit = 0; 3079 } 3080 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3081 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3082 /* 3083 * JRS - Use the congestion control given in the pluggable 3084 * CC module 3085 */ 3086 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3087 /* 3088 * We reduce once every RTT. So we will only lower cwnd at 3089 * the next sending seq i.e. the window_data_tsn 3090 */ 3091 net->cwr_window_tsn = window_data_tsn; 3092 net->ecn_ce_pkt_cnt += pkt_cnt; 3093 net->lost_cnt = pkt_cnt; 3094 net->last_cwr_tsn = tsn; 3095 } else { 3096 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3097 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3098 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3099 /* 3100 * Another loss in the same window update how many 3101 * marks/packets lost we have had. 3102 */ 3103 int cnt = 1; 3104 3105 if (pkt_cnt > net->lost_cnt) { 3106 /* Should be the case */ 3107 cnt = (pkt_cnt - net->lost_cnt); 3108 net->ecn_ce_pkt_cnt += cnt; 3109 } 3110 net->lost_cnt = pkt_cnt; 3111 net->last_cwr_tsn = tsn; 3112 /* 3113 * Most CC functions will ignore this call, since we 3114 * are in-window yet of the initial CE the peer saw. 3115 */ 3116 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3117 } 3118 } 3119 /* 3120 * We always send a CWR this way if our previous one was lost our 3121 * peer will get an update, or if it is not time again to reduce we 3122 * still get the cwr to the peer. Note we set the override when we 3123 * could not find the TSN on the chunk or the destination network. 3124 */ 3125 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3126 } 3127 3128 static void 3129 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3130 { 3131 /* 3132 * Here we get a CWR from the peer. We must look in the outqueue and 3133 * make sure that we have a covered ECNE in the control chunk part. 3134 * If so remove it. 3135 */ 3136 struct sctp_tmit_chunk *chk; 3137 struct sctp_ecne_chunk *ecne; 3138 int override; 3139 uint32_t cwr_tsn; 3140 3141 cwr_tsn = ntohl(cp->tsn); 3142 3143 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3144 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3145 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3146 continue; 3147 } 3148 if ((override == 0) && (chk->whoTo != net)) { 3149 /* Must be from the right src unless override is set */ 3150 continue; 3151 } 3152 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3153 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3154 /* this covers this ECNE, we can remove it */ 3155 stcb->asoc.ecn_echo_cnt_onq--; 3156 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3157 sctp_next); 3158 if (chk->data) { 3159 sctp_m_freem(chk->data); 3160 chk->data = NULL; 3161 } 3162 stcb->asoc.ctrl_queue_cnt--; 3163 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3164 if (override == 0) { 3165 break; 3166 } 3167 } 3168 } 3169 } 3170 3171 static void 3172 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3173 struct sctp_tcb *stcb, struct sctp_nets *net) 3174 { 3175 struct sctp_association *asoc; 3176 3177 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3178 struct socket *so; 3179 3180 #endif 3181 3182 SCTPDBG(SCTP_DEBUG_INPUT2, 3183 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3184 if (stcb == NULL) 3185 return; 3186 3187 asoc = &stcb->asoc; 3188 /* process according to association state */ 3189 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3190 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3191 SCTPDBG(SCTP_DEBUG_INPUT2, 3192 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3193 SCTP_TCB_UNLOCK(stcb); 3194 return; 3195 } 3196 /* notify upper layer protocol */ 3197 if (stcb->sctp_socket) { 3198 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3199 /* are the queues empty? they should be */ 3200 if (!TAILQ_EMPTY(&asoc->send_queue) || 3201 !TAILQ_EMPTY(&asoc->sent_queue) || 3202 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3203 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3204 } 3205 } 3206 /* stop the timer */ 3207 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3208 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3209 /* free the TCB */ 3210 SCTPDBG(SCTP_DEBUG_INPUT2, 3211 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3212 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3213 so = SCTP_INP_SO(stcb->sctp_ep); 3214 atomic_add_int(&stcb->asoc.refcnt, 1); 3215 SCTP_TCB_UNLOCK(stcb); 3216 SCTP_SOCKET_LOCK(so, 1); 3217 SCTP_TCB_LOCK(stcb); 3218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3219 #endif 3220 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3222 SCTP_SOCKET_UNLOCK(so, 1); 3223 #endif 3224 return; 3225 } 3226 3227 static int 3228 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3229 struct sctp_nets *net, uint8_t flg) 3230 { 3231 switch (desc->chunk_type) { 3232 case SCTP_DATA: 3233 /* find the tsn to resend (possibly */ 3234 { 3235 uint32_t tsn; 3236 struct sctp_tmit_chunk *tp1; 3237 3238 tsn = ntohl(desc->tsn_ifany); 3239 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3240 if (tp1->rec.data.TSN_seq == tsn) { 3241 /* found it */ 3242 break; 3243 } 3244 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3245 /* not found */ 3246 tp1 = NULL; 3247 break; 3248 } 3249 } 3250 if (tp1 == NULL) { 3251 /* 3252 * Do it the other way , aka without paying 3253 * attention to queue seq order. 3254 */ 3255 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3256 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3257 if (tp1->rec.data.TSN_seq == tsn) { 3258 /* found it */ 3259 break; 3260 } 3261 } 3262 } 3263 if (tp1 == NULL) { 3264 SCTP_STAT_INCR(sctps_pdrptsnnf); 3265 } 3266 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3267 uint8_t *ddp; 3268 3269 if (((flg & SCTP_BADCRC) == 0) && 3270 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3271 return (0); 3272 } 3273 if ((stcb->asoc.peers_rwnd == 0) && 3274 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3275 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3276 return (0); 3277 } 3278 if (stcb->asoc.peers_rwnd == 0 && 3279 (flg & SCTP_FROM_MIDDLE_BOX)) { 3280 SCTP_STAT_INCR(sctps_pdrpdizrw); 3281 return (0); 3282 } 3283 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3284 sizeof(struct sctp_data_chunk)); 3285 { 3286 unsigned int iii; 3287 3288 for (iii = 0; iii < sizeof(desc->data_bytes); 3289 iii++) { 3290 if (ddp[iii] != desc->data_bytes[iii]) { 3291 SCTP_STAT_INCR(sctps_pdrpbadd); 3292 return (-1); 3293 } 3294 } 3295 } 3296 3297 if (tp1->do_rtt) { 3298 /* 3299 * this guy had a RTO calculation 3300 * pending on it, cancel it 3301 */ 3302 if (tp1->whoTo->rto_needed == 0) { 3303 tp1->whoTo->rto_needed = 1; 3304 } 3305 tp1->do_rtt = 0; 3306 } 3307 SCTP_STAT_INCR(sctps_pdrpmark); 3308 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3309 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3310 /* 3311 * mark it as if we were doing a FR, since 3312 * we will be getting gap ack reports behind 3313 * the info from the router. 3314 */ 3315 tp1->rec.data.doing_fast_retransmit = 1; 3316 /* 3317 * mark the tsn with what sequences can 3318 * cause a new FR. 3319 */ 3320 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3321 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3322 } else { 3323 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3324 } 3325 3326 /* restart the timer */ 3327 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3328 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3329 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3330 stcb, tp1->whoTo); 3331 3332 /* fix counts and things */ 3333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3334 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3335 tp1->whoTo->flight_size, 3336 tp1->book_size, 3337 (uintptr_t) stcb, 3338 tp1->rec.data.TSN_seq); 3339 } 3340 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3341 sctp_flight_size_decrease(tp1); 3342 sctp_total_flight_decrease(stcb, tp1); 3343 } 3344 tp1->sent = SCTP_DATAGRAM_RESEND; 3345 } { 3346 /* audit code */ 3347 unsigned int audit; 3348 3349 audit = 0; 3350 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3351 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3352 audit++; 3353 } 3354 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3355 sctp_next) { 3356 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3357 audit++; 3358 } 3359 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3360 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3361 audit, stcb->asoc.sent_queue_retran_cnt); 3362 #ifndef SCTP_AUDITING_ENABLED 3363 stcb->asoc.sent_queue_retran_cnt = audit; 3364 #endif 3365 } 3366 } 3367 } 3368 break; 3369 case SCTP_ASCONF: 3370 { 3371 struct sctp_tmit_chunk *asconf; 3372 3373 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3374 sctp_next) { 3375 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3376 break; 3377 } 3378 } 3379 if (asconf) { 3380 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3381 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3382 asconf->sent = SCTP_DATAGRAM_RESEND; 3383 asconf->snd_count--; 3384 } 3385 } 3386 break; 3387 case SCTP_INITIATION: 3388 /* resend the INIT */ 3389 stcb->asoc.dropped_special_cnt++; 3390 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3391 /* 3392 * If we can get it in, in a few attempts we do 3393 * this, otherwise we let the timer fire. 3394 */ 3395 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3396 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3397 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3398 } 3399 break; 3400 case SCTP_SELECTIVE_ACK: 3401 case SCTP_NR_SELECTIVE_ACK: 3402 /* resend the sack */ 3403 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3404 break; 3405 case SCTP_HEARTBEAT_REQUEST: 3406 /* resend a demand HB */ 3407 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3408 /* 3409 * Only retransmit if we KNOW we wont destroy the 3410 * tcb 3411 */ 3412 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3413 } 3414 break; 3415 case SCTP_SHUTDOWN: 3416 sctp_send_shutdown(stcb, net); 3417 break; 3418 case SCTP_SHUTDOWN_ACK: 3419 sctp_send_shutdown_ack(stcb, net); 3420 break; 3421 case SCTP_COOKIE_ECHO: 3422 { 3423 struct sctp_tmit_chunk *cookie; 3424 3425 cookie = NULL; 3426 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3427 sctp_next) { 3428 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3429 break; 3430 } 3431 } 3432 if (cookie) { 3433 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3434 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3435 cookie->sent = SCTP_DATAGRAM_RESEND; 3436 sctp_stop_all_cookie_timers(stcb); 3437 } 3438 } 3439 break; 3440 case SCTP_COOKIE_ACK: 3441 sctp_send_cookie_ack(stcb); 3442 break; 3443 case SCTP_ASCONF_ACK: 3444 /* resend last asconf ack */ 3445 sctp_send_asconf_ack(stcb); 3446 break; 3447 case SCTP_FORWARD_CUM_TSN: 3448 send_forward_tsn(stcb, &stcb->asoc); 3449 break; 3450 /* can't do anything with these */ 3451 case SCTP_PACKET_DROPPED: 3452 case SCTP_INITIATION_ACK: /* this should not happen */ 3453 case SCTP_HEARTBEAT_ACK: 3454 case SCTP_ABORT_ASSOCIATION: 3455 case SCTP_OPERATION_ERROR: 3456 case SCTP_SHUTDOWN_COMPLETE: 3457 case SCTP_ECN_ECHO: 3458 case SCTP_ECN_CWR: 3459 default: 3460 break; 3461 } 3462 return (0); 3463 } 3464 3465 void 3466 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3467 { 3468 uint32_t i; 3469 uint16_t temp; 3470 3471 /* 3472 * We set things to 0xffff since this is the last delivered sequence 3473 * and we will be sending in 0 after the reset. 3474 */ 3475 3476 if (number_entries) { 3477 for (i = 0; i < number_entries; i++) { 3478 temp = ntohs(list[i]); 3479 if (temp >= stcb->asoc.streamincnt) { 3480 continue; 3481 } 3482 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3483 } 3484 } else { 3485 list = NULL; 3486 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3487 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3488 } 3489 } 3490 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3491 } 3492 3493 static void 3494 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3495 { 3496 int i; 3497 3498 if (number_entries == 0) { 3499 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3500 stcb->asoc.strmout[i].next_sequence_send = 0; 3501 } 3502 } else if (number_entries) { 3503 for (i = 0; i < number_entries; i++) { 3504 uint16_t temp; 3505 3506 temp = ntohs(list[i]); 3507 if (temp >= stcb->asoc.streamoutcnt) { 3508 /* no such stream */ 3509 continue; 3510 } 3511 stcb->asoc.strmout[temp].next_sequence_send = 0; 3512 } 3513 } 3514 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3515 } 3516 3517 3518 struct sctp_stream_reset_out_request * 3519 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3520 { 3521 struct sctp_association *asoc; 3522 struct sctp_chunkhdr *ch; 3523 struct sctp_stream_reset_out_request *r; 3524 struct sctp_tmit_chunk *chk; 3525 int len, clen; 3526 3527 asoc = &stcb->asoc; 3528 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3529 asoc->stream_reset_outstanding = 0; 3530 return (NULL); 3531 } 3532 if (stcb->asoc.str_reset == NULL) { 3533 asoc->stream_reset_outstanding = 0; 3534 return (NULL); 3535 } 3536 chk = stcb->asoc.str_reset; 3537 if (chk->data == NULL) { 3538 return (NULL); 3539 } 3540 if (bchk) { 3541 /* he wants a copy of the chk pointer */ 3542 *bchk = chk; 3543 } 3544 clen = chk->send_size; 3545 ch = mtod(chk->data, struct sctp_chunkhdr *); 3546 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3547 if (ntohl(r->request_seq) == seq) { 3548 /* found it */ 3549 return (r); 3550 } 3551 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3552 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3553 /* move to the next one, there can only be a max of two */ 3554 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3555 if (ntohl(r->request_seq) == seq) { 3556 return (r); 3557 } 3558 } 3559 /* that seq is not here */ 3560 return (NULL); 3561 } 3562 3563 static void 3564 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3565 { 3566 struct sctp_association *asoc; 3567 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3568 3569 if (stcb->asoc.str_reset == NULL) { 3570 return; 3571 } 3572 asoc = &stcb->asoc; 3573 3574 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3575 TAILQ_REMOVE(&asoc->control_send_queue, 3576 chk, 3577 sctp_next); 3578 if (chk->data) { 3579 sctp_m_freem(chk->data); 3580 chk->data = NULL; 3581 } 3582 asoc->ctrl_queue_cnt--; 3583 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3584 /* sa_ignore NO_NULL_CHK */ 3585 stcb->asoc.str_reset = NULL; 3586 } 3587 3588 3589 static int 3590 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3591 uint32_t seq, uint32_t action, 3592 struct sctp_stream_reset_response *respin) 3593 { 3594 uint16_t type; 3595 int lparm_len; 3596 struct sctp_association *asoc = &stcb->asoc; 3597 struct sctp_tmit_chunk *chk; 3598 struct sctp_stream_reset_out_request *srparam; 3599 int number_entries; 3600 3601 if (asoc->stream_reset_outstanding == 0) { 3602 /* duplicate */ 3603 return (0); 3604 } 3605 if (seq == stcb->asoc.str_reset_seq_out) { 3606 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3607 if (srparam) { 3608 stcb->asoc.str_reset_seq_out++; 3609 type = ntohs(srparam->ph.param_type); 3610 lparm_len = ntohs(srparam->ph.param_length); 3611 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3612 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3613 asoc->stream_reset_out_is_outstanding = 0; 3614 if (asoc->stream_reset_outstanding) 3615 asoc->stream_reset_outstanding--; 3616 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3617 /* do it */ 3618 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3619 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3620 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3621 } else { 3622 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3623 } 3624 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3625 /* Answered my request */ 3626 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3627 if (asoc->stream_reset_outstanding) 3628 asoc->stream_reset_outstanding--; 3629 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3630 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3631 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3632 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3633 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3634 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3635 } 3636 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3637 /* Ok we now may have more streams */ 3638 int num_stream; 3639 3640 num_stream = stcb->asoc.strm_pending_add_size; 3641 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3642 /* TSNH */ 3643 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3644 } 3645 stcb->asoc.strm_pending_add_size = 0; 3646 if (asoc->stream_reset_outstanding) 3647 asoc->stream_reset_outstanding--; 3648 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3649 /* Put the new streams into effect */ 3650 stcb->asoc.streamoutcnt += num_stream; 3651 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3652 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3653 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3654 SCTP_STREAM_CHANGE_DENIED); 3655 } else { 3656 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3657 SCTP_STREAM_CHANGE_FAILED); 3658 } 3659 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3660 if (asoc->stream_reset_outstanding) 3661 asoc->stream_reset_outstanding--; 3662 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3663 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3664 SCTP_STREAM_CHANGE_DENIED); 3665 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3666 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3667 SCTP_STREAM_CHANGE_FAILED); 3668 } 3669 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3670 /** 3671 * a) Adopt the new in tsn. 3672 * b) reset the map 3673 * c) Adopt the new out-tsn 3674 */ 3675 struct sctp_stream_reset_response_tsn *resp; 3676 struct sctp_forward_tsn_chunk fwdtsn; 3677 int abort_flag = 0; 3678 3679 if (respin == NULL) { 3680 /* huh ? */ 3681 return (0); 3682 } 3683 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3684 return (0); 3685 } 3686 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3687 resp = (struct sctp_stream_reset_response_tsn *)respin; 3688 asoc->stream_reset_outstanding--; 3689 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3690 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3691 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3692 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3693 if (abort_flag) { 3694 return (1); 3695 } 3696 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3697 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3698 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3699 } 3700 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3701 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3702 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3703 3704 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3705 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3706 3707 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3708 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3709 3710 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3711 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3712 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3713 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3714 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3715 SCTP_ASSOC_RESET_DENIED); 3716 } else { 3717 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3718 SCTP_ASSOC_RESET_FAILED); 3719 } 3720 } 3721 /* get rid of the request and get the request flags */ 3722 if (asoc->stream_reset_outstanding == 0) { 3723 sctp_clean_up_stream_reset(stcb); 3724 } 3725 } 3726 } 3727 return (0); 3728 } 3729 3730 static void 3731 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3732 struct sctp_tmit_chunk *chk, 3733 struct sctp_stream_reset_in_request *req, int trunc) 3734 { 3735 uint32_t seq; 3736 int len, i; 3737 int number_entries; 3738 uint16_t temp; 3739 3740 /* 3741 * peer wants me to send a str-reset to him for my outgoing seq's if 3742 * seq_in is right. 3743 */ 3744 struct sctp_association *asoc = &stcb->asoc; 3745 3746 seq = ntohl(req->request_seq); 3747 if (asoc->str_reset_seq_in == seq) { 3748 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3749 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3750 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3751 } else if (trunc) { 3752 /* Can't do it, since they exceeded our buffer size */ 3753 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3754 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3755 len = ntohs(req->ph.param_length); 3756 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3757 for (i = 0; i < number_entries; i++) { 3758 temp = ntohs(req->list_of_streams[i]); 3759 req->list_of_streams[i] = temp; 3760 } 3761 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3762 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3763 asoc->str_reset_seq_out, 3764 seq, (asoc->sending_seq - 1)); 3765 asoc->stream_reset_out_is_outstanding = 1; 3766 asoc->str_reset = chk; 3767 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3768 stcb->asoc.stream_reset_outstanding++; 3769 } else { 3770 /* Can't do it, since we have sent one out */ 3771 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3772 } 3773 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3774 asoc->str_reset_seq_in++; 3775 } else if (asoc->str_reset_seq_in - 1 == seq) { 3776 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3777 } else if (asoc->str_reset_seq_in - 2 == seq) { 3778 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3779 } else { 3780 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3781 } 3782 } 3783 3784 static int 3785 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3786 struct sctp_tmit_chunk *chk, 3787 struct sctp_stream_reset_tsn_request *req) 3788 { 3789 /* reset all in and out and update the tsn */ 3790 /* 3791 * A) reset my str-seq's on in and out. B) Select a receive next, 3792 * and set cum-ack to it. Also process this selected number as a 3793 * fwd-tsn as well. C) set in the response my next sending seq. 3794 */ 3795 struct sctp_forward_tsn_chunk fwdtsn; 3796 struct sctp_association *asoc = &stcb->asoc; 3797 int abort_flag = 0; 3798 uint32_t seq; 3799 3800 seq = ntohl(req->request_seq); 3801 if (asoc->str_reset_seq_in == seq) { 3802 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3803 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3804 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3805 } else { 3806 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3807 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3808 fwdtsn.ch.chunk_flags = 0; 3809 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3810 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3811 if (abort_flag) { 3812 return (1); 3813 } 3814 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3815 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3816 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3817 } 3818 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3819 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3820 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3821 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3822 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3823 atomic_add_int(&asoc->sending_seq, 1); 3824 /* save off historical data for retrans */ 3825 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3826 asoc->last_sending_seq[0] = asoc->sending_seq; 3827 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3828 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3829 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3830 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3831 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3832 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3833 } 3834 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3835 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3836 asoc->str_reset_seq_in++; 3837 } else if (asoc->str_reset_seq_in - 1 == seq) { 3838 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3839 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3840 } else if (asoc->str_reset_seq_in - 2 == seq) { 3841 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3842 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3843 } else { 3844 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3845 } 3846 return (0); 3847 } 3848 3849 static void 3850 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3851 struct sctp_tmit_chunk *chk, 3852 struct sctp_stream_reset_out_request *req, int trunc) 3853 { 3854 uint32_t seq, tsn; 3855 int number_entries, len; 3856 struct sctp_association *asoc = &stcb->asoc; 3857 3858 seq = ntohl(req->request_seq); 3859 3860 /* now if its not a duplicate we process it */ 3861 if (asoc->str_reset_seq_in == seq) { 3862 len = ntohs(req->ph.param_length); 3863 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3864 /* 3865 * the sender is resetting, handle the list issue.. we must 3866 * a) verify if we can do the reset, if so no problem b) If 3867 * we can't do the reset we must copy the request. c) queue 3868 * it, and setup the data in processor to trigger it off 3869 * when needed and dequeue all the queued data. 3870 */ 3871 tsn = ntohl(req->send_reset_at_tsn); 3872 3873 /* move the reset action back one */ 3874 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3875 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3876 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3877 } else if (trunc) { 3878 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3879 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3880 /* we can do it now */ 3881 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3882 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3883 } else { 3884 /* 3885 * we must queue it up and thus wait for the TSN's 3886 * to arrive that are at or before tsn 3887 */ 3888 struct sctp_stream_reset_list *liste; 3889 int siz; 3890 3891 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3892 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3893 siz, SCTP_M_STRESET); 3894 if (liste == NULL) { 3895 /* gak out of memory */ 3896 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3897 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3898 return; 3899 } 3900 liste->tsn = tsn; 3901 liste->number_entries = number_entries; 3902 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3903 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3904 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3905 } 3906 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3907 asoc->str_reset_seq_in++; 3908 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3909 /* 3910 * one seq back, just echo back last action since my 3911 * response was lost. 3912 */ 3913 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3914 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3915 /* 3916 * two seq back, just echo back last action since my 3917 * response was lost. 3918 */ 3919 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3920 } else { 3921 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3922 } 3923 } 3924 3925 static void 3926 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3927 struct sctp_stream_reset_add_strm *str_add) 3928 { 3929 /* 3930 * Peer is requesting to add more streams. If its within our 3931 * max-streams we will allow it. 3932 */ 3933 uint32_t num_stream, i; 3934 uint32_t seq; 3935 struct sctp_association *asoc = &stcb->asoc; 3936 struct sctp_queued_to_read *ctl, *nctl; 3937 3938 /* Get the number. */ 3939 seq = ntohl(str_add->request_seq); 3940 num_stream = ntohs(str_add->number_of_streams); 3941 /* Now what would be the new total? */ 3942 if (asoc->str_reset_seq_in == seq) { 3943 num_stream += stcb->asoc.streamincnt; 3944 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3945 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3946 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3947 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3948 (num_stream > 0xffff)) { 3949 /* We must reject it they ask for to many */ 3950 denied: 3951 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3952 } else { 3953 /* Ok, we can do that :-) */ 3954 struct sctp_stream_in *oldstrm; 3955 3956 /* save off the old */ 3957 oldstrm = stcb->asoc.strmin; 3958 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3959 (num_stream * sizeof(struct sctp_stream_in)), 3960 SCTP_M_STRMI); 3961 if (stcb->asoc.strmin == NULL) { 3962 stcb->asoc.strmin = oldstrm; 3963 goto denied; 3964 } 3965 /* copy off the old data */ 3966 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3967 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3968 stcb->asoc.strmin[i].stream_no = i; 3969 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3970 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3971 /* now anything on those queues? */ 3972 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3973 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3974 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3975 } 3976 } 3977 /* Init the new streams */ 3978 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3979 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3980 stcb->asoc.strmin[i].stream_no = i; 3981 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3982 stcb->asoc.strmin[i].delivery_started = 0; 3983 } 3984 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3985 /* update the size */ 3986 stcb->asoc.streamincnt = num_stream; 3987 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3988 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3989 } 3990 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3991 asoc->str_reset_seq_in++; 3992 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3993 /* 3994 * one seq back, just echo back last action since my 3995 * response was lost. 3996 */ 3997 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3998 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3999 /* 4000 * two seq back, just echo back last action since my 4001 * response was lost. 4002 */ 4003 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4004 } else { 4005 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4006 4007 } 4008 } 4009 4010 static void 4011 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4012 struct sctp_stream_reset_add_strm *str_add) 4013 { 4014 /* 4015 * Peer is requesting to add more streams. If its within our 4016 * max-streams we will allow it. 4017 */ 4018 uint16_t num_stream; 4019 uint32_t seq; 4020 struct sctp_association *asoc = &stcb->asoc; 4021 4022 /* Get the number. */ 4023 seq = ntohl(str_add->request_seq); 4024 num_stream = ntohs(str_add->number_of_streams); 4025 /* Now what would be the new total? */ 4026 if (asoc->str_reset_seq_in == seq) { 4027 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4028 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4029 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4030 } else if (stcb->asoc.stream_reset_outstanding) { 4031 /* We must reject it we have something pending */ 4032 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4033 } else { 4034 /* Ok, we can do that :-) */ 4035 int mychk; 4036 4037 mychk = stcb->asoc.streamoutcnt; 4038 mychk += num_stream; 4039 if (mychk < 0x10000) { 4040 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4041 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4042 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4043 } 4044 } else { 4045 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4046 } 4047 } 4048 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4049 asoc->str_reset_seq_in++; 4050 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4051 /* 4052 * one seq back, just echo back last action since my 4053 * response was lost. 4054 */ 4055 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4056 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4057 /* 4058 * two seq back, just echo back last action since my 4059 * response was lost. 4060 */ 4061 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4062 } else { 4063 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4064 } 4065 } 4066 4067 #ifdef __GNUC__ 4068 __attribute__((noinline)) 4069 #endif 4070 static int 4071 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4072 struct sctp_chunkhdr *ch_req) 4073 { 4074 uint16_t remaining_length, param_len, ptype; 4075 struct sctp_paramhdr pstore; 4076 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4077 uint32_t seq = 0; 4078 int num_req = 0; 4079 int trunc = 0; 4080 struct sctp_tmit_chunk *chk; 4081 struct sctp_chunkhdr *ch; 4082 struct sctp_paramhdr *ph; 4083 int ret_code = 0; 4084 int num_param = 0; 4085 4086 /* now it may be a reset or a reset-response */ 4087 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4088 4089 /* setup for adding the response */ 4090 sctp_alloc_a_chunk(stcb, chk); 4091 if (chk == NULL) { 4092 return (ret_code); 4093 } 4094 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4095 chk->rec.chunk_id.can_take_data = 0; 4096 chk->asoc = &stcb->asoc; 4097 chk->no_fr_allowed = 0; 4098 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4099 chk->book_size_scale = 0; 4100 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4101 if (chk->data == NULL) { 4102 strres_nochunk: 4103 if (chk->data) { 4104 sctp_m_freem(chk->data); 4105 chk->data = NULL; 4106 } 4107 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4108 return (ret_code); 4109 } 4110 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4111 4112 /* setup chunk parameters */ 4113 chk->sent = SCTP_DATAGRAM_UNSENT; 4114 chk->snd_count = 0; 4115 chk->whoTo = NULL; 4116 4117 ch = mtod(chk->data, struct sctp_chunkhdr *); 4118 ch->chunk_type = SCTP_STREAM_RESET; 4119 ch->chunk_flags = 0; 4120 ch->chunk_length = htons(chk->send_size); 4121 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4122 offset += sizeof(struct sctp_chunkhdr); 4123 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4124 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4125 if (ph == NULL) { 4126 /* TSNH */ 4127 break; 4128 } 4129 param_len = ntohs(ph->param_length); 4130 if ((param_len > remaining_length) || 4131 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4132 /* bad parameter length */ 4133 break; 4134 } 4135 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4136 (uint8_t *) & cstore); 4137 if (ph == NULL) { 4138 /* TSNH */ 4139 break; 4140 } 4141 ptype = ntohs(ph->param_type); 4142 num_param++; 4143 if (param_len > sizeof(cstore)) { 4144 trunc = 1; 4145 } else { 4146 trunc = 0; 4147 } 4148 if (num_param > SCTP_MAX_RESET_PARAMS) { 4149 /* hit the max of parameters already sorry.. */ 4150 break; 4151 } 4152 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4153 struct sctp_stream_reset_out_request *req_out; 4154 4155 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4156 break; 4157 } 4158 req_out = (struct sctp_stream_reset_out_request *)ph; 4159 num_req++; 4160 if (stcb->asoc.stream_reset_outstanding) { 4161 seq = ntohl(req_out->response_seq); 4162 if (seq == stcb->asoc.str_reset_seq_out) { 4163 /* implicit ack */ 4164 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4165 } 4166 } 4167 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4168 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4169 struct sctp_stream_reset_add_strm *str_add; 4170 4171 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4172 break; 4173 } 4174 str_add = (struct sctp_stream_reset_add_strm *)ph; 4175 num_req++; 4176 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4177 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4178 struct sctp_stream_reset_add_strm *str_add; 4179 4180 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4181 break; 4182 } 4183 str_add = (struct sctp_stream_reset_add_strm *)ph; 4184 num_req++; 4185 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4186 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4187 struct sctp_stream_reset_in_request *req_in; 4188 4189 num_req++; 4190 req_in = (struct sctp_stream_reset_in_request *)ph; 4191 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4192 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4193 struct sctp_stream_reset_tsn_request *req_tsn; 4194 4195 num_req++; 4196 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4197 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4198 ret_code = 1; 4199 goto strres_nochunk; 4200 } 4201 /* no more */ 4202 break; 4203 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4204 struct sctp_stream_reset_response *resp; 4205 uint32_t result; 4206 4207 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4208 break; 4209 } 4210 resp = (struct sctp_stream_reset_response *)ph; 4211 seq = ntohl(resp->response_seq); 4212 result = ntohl(resp->result); 4213 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4214 ret_code = 1; 4215 goto strres_nochunk; 4216 } 4217 } else { 4218 break; 4219 } 4220 offset += SCTP_SIZE32(param_len); 4221 if (remaining_length >= SCTP_SIZE32(param_len)) { 4222 remaining_length -= SCTP_SIZE32(param_len); 4223 } else { 4224 remaining_length = 0; 4225 } 4226 } 4227 if (num_req == 0) { 4228 /* we have no response free the stuff */ 4229 goto strres_nochunk; 4230 } 4231 /* ok we have a chunk to link in */ 4232 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4233 chk, 4234 sctp_next); 4235 stcb->asoc.ctrl_queue_cnt++; 4236 return (ret_code); 4237 } 4238 4239 /* 4240 * Handle a router or endpoints report of a packet loss, there are two ways 4241 * to handle this, either we get the whole packet and must disect it 4242 * ourselves (possibly with truncation and or corruption) or it is a summary 4243 * from a middle box that did the disectting for us. 4244 */ 4245 static void 4246 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4247 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4248 { 4249 uint32_t bottle_bw, on_queue; 4250 uint16_t trunc_len; 4251 unsigned int chlen; 4252 unsigned int at; 4253 struct sctp_chunk_desc desc; 4254 struct sctp_chunkhdr *ch; 4255 4256 chlen = ntohs(cp->ch.chunk_length); 4257 chlen -= sizeof(struct sctp_pktdrop_chunk); 4258 /* XXX possible chlen underflow */ 4259 if (chlen == 0) { 4260 ch = NULL; 4261 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4262 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4263 } else { 4264 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4265 chlen -= sizeof(struct sctphdr); 4266 /* XXX possible chlen underflow */ 4267 memset(&desc, 0, sizeof(desc)); 4268 } 4269 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4270 if (trunc_len > limit) { 4271 trunc_len = limit; 4272 } 4273 /* now the chunks themselves */ 4274 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4275 desc.chunk_type = ch->chunk_type; 4276 /* get amount we need to move */ 4277 at = ntohs(ch->chunk_length); 4278 if (at < sizeof(struct sctp_chunkhdr)) { 4279 /* corrupt chunk, maybe at the end? */ 4280 SCTP_STAT_INCR(sctps_pdrpcrupt); 4281 break; 4282 } 4283 if (trunc_len == 0) { 4284 /* we are supposed to have all of it */ 4285 if (at > chlen) { 4286 /* corrupt skip it */ 4287 SCTP_STAT_INCR(sctps_pdrpcrupt); 4288 break; 4289 } 4290 } else { 4291 /* is there enough of it left ? */ 4292 if (desc.chunk_type == SCTP_DATA) { 4293 if (chlen < (sizeof(struct sctp_data_chunk) + 4294 sizeof(desc.data_bytes))) { 4295 break; 4296 } 4297 } else { 4298 if (chlen < sizeof(struct sctp_chunkhdr)) { 4299 break; 4300 } 4301 } 4302 } 4303 if (desc.chunk_type == SCTP_DATA) { 4304 /* can we get out the tsn? */ 4305 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4306 SCTP_STAT_INCR(sctps_pdrpmbda); 4307 4308 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4309 /* yep */ 4310 struct sctp_data_chunk *dcp; 4311 uint8_t *ddp; 4312 unsigned int iii; 4313 4314 dcp = (struct sctp_data_chunk *)ch; 4315 ddp = (uint8_t *) (dcp + 1); 4316 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4317 desc.data_bytes[iii] = ddp[iii]; 4318 } 4319 desc.tsn_ifany = dcp->dp.tsn; 4320 } else { 4321 /* nope we are done. */ 4322 SCTP_STAT_INCR(sctps_pdrpnedat); 4323 break; 4324 } 4325 } else { 4326 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4327 SCTP_STAT_INCR(sctps_pdrpmbct); 4328 } 4329 4330 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4331 SCTP_STAT_INCR(sctps_pdrppdbrk); 4332 break; 4333 } 4334 if (SCTP_SIZE32(at) > chlen) { 4335 break; 4336 } 4337 chlen -= SCTP_SIZE32(at); 4338 if (chlen < sizeof(struct sctp_chunkhdr)) { 4339 /* done, none left */ 4340 break; 4341 } 4342 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4343 } 4344 /* Now update any rwnd --- possibly */ 4345 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4346 /* From a peer, we get a rwnd report */ 4347 uint32_t a_rwnd; 4348 4349 SCTP_STAT_INCR(sctps_pdrpfehos); 4350 4351 bottle_bw = ntohl(cp->bottle_bw); 4352 on_queue = ntohl(cp->current_onq); 4353 if (bottle_bw && on_queue) { 4354 /* a rwnd report is in here */ 4355 if (bottle_bw > on_queue) 4356 a_rwnd = bottle_bw - on_queue; 4357 else 4358 a_rwnd = 0; 4359 4360 if (a_rwnd == 0) 4361 stcb->asoc.peers_rwnd = 0; 4362 else { 4363 if (a_rwnd > stcb->asoc.total_flight) { 4364 stcb->asoc.peers_rwnd = 4365 a_rwnd - stcb->asoc.total_flight; 4366 } else { 4367 stcb->asoc.peers_rwnd = 0; 4368 } 4369 if (stcb->asoc.peers_rwnd < 4370 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4371 /* SWS sender side engages */ 4372 stcb->asoc.peers_rwnd = 0; 4373 } 4374 } 4375 } 4376 } else { 4377 SCTP_STAT_INCR(sctps_pdrpfmbox); 4378 } 4379 4380 /* now middle boxes in sat networks get a cwnd bump */ 4381 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4382 (stcb->asoc.sat_t3_loss_recovery == 0) && 4383 (stcb->asoc.sat_network)) { 4384 /* 4385 * This is debateable but for sat networks it makes sense 4386 * Note if a T3 timer has went off, we will prohibit any 4387 * changes to cwnd until we exit the t3 loss recovery. 4388 */ 4389 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4390 net, cp, &bottle_bw, &on_queue); 4391 } 4392 } 4393 4394 /* 4395 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4396 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4397 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4398 * length of the complete packet outputs: - length: modified to remaining 4399 * length after control processing - netp: modified to new sctp_nets after 4400 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4401 * bad packet,...) otherwise return the tcb for this packet 4402 */ 4403 #ifdef __GNUC__ 4404 __attribute__((noinline)) 4405 #endif 4406 static struct sctp_tcb * 4407 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4408 struct sockaddr *src, struct sockaddr *dst, 4409 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4410 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4411 uint8_t use_mflowid, uint32_t mflowid, 4412 uint32_t vrf_id, uint16_t port) 4413 { 4414 struct sctp_association *asoc; 4415 uint32_t vtag_in; 4416 int num_chunks = 0; /* number of control chunks processed */ 4417 uint32_t chk_length; 4418 int ret; 4419 int abort_no_unlock = 0; 4420 int ecne_seen = 0; 4421 4422 /* 4423 * How big should this be, and should it be alloc'd? Lets try the 4424 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4425 * until we get into jumbo grams and such.. 4426 */ 4427 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4428 struct sctp_tcb *locked_tcb = stcb; 4429 int got_auth = 0; 4430 uint32_t auth_offset = 0, auth_len = 0; 4431 int auth_skipped = 0; 4432 int asconf_cnt = 0; 4433 4434 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4435 struct socket *so; 4436 4437 #endif 4438 4439 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4440 iphlen, *offset, length, (void *)stcb); 4441 4442 /* validate chunk header length... */ 4443 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4444 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4445 ntohs(ch->chunk_length)); 4446 if (locked_tcb) { 4447 SCTP_TCB_UNLOCK(locked_tcb); 4448 } 4449 return (NULL); 4450 } 4451 /* 4452 * validate the verification tag 4453 */ 4454 vtag_in = ntohl(sh->v_tag); 4455 4456 if (locked_tcb) { 4457 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4458 } 4459 if (ch->chunk_type == SCTP_INITIATION) { 4460 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4461 ntohs(ch->chunk_length), vtag_in); 4462 if (vtag_in != 0) { 4463 /* protocol error- silently discard... */ 4464 SCTP_STAT_INCR(sctps_badvtag); 4465 if (locked_tcb) { 4466 SCTP_TCB_UNLOCK(locked_tcb); 4467 } 4468 return (NULL); 4469 } 4470 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4471 /* 4472 * If there is no stcb, skip the AUTH chunk and process 4473 * later after a stcb is found (to validate the lookup was 4474 * valid. 4475 */ 4476 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4477 (stcb == NULL) && 4478 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4479 /* save this chunk for later processing */ 4480 auth_skipped = 1; 4481 auth_offset = *offset; 4482 auth_len = ntohs(ch->chunk_length); 4483 4484 /* (temporarily) move past this chunk */ 4485 *offset += SCTP_SIZE32(auth_len); 4486 if (*offset >= length) { 4487 /* no more data left in the mbuf chain */ 4488 *offset = length; 4489 if (locked_tcb) { 4490 SCTP_TCB_UNLOCK(locked_tcb); 4491 } 4492 return (NULL); 4493 } 4494 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4495 sizeof(struct sctp_chunkhdr), chunk_buf); 4496 } 4497 if (ch == NULL) { 4498 /* Help */ 4499 *offset = length; 4500 if (locked_tcb) { 4501 SCTP_TCB_UNLOCK(locked_tcb); 4502 } 4503 return (NULL); 4504 } 4505 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4506 goto process_control_chunks; 4507 } 4508 /* 4509 * first check if it's an ASCONF with an unknown src addr we 4510 * need to look inside to find the association 4511 */ 4512 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4513 struct sctp_chunkhdr *asconf_ch = ch; 4514 uint32_t asconf_offset = 0, asconf_len = 0; 4515 4516 /* inp's refcount may be reduced */ 4517 SCTP_INP_INCR_REF(inp); 4518 4519 asconf_offset = *offset; 4520 do { 4521 asconf_len = ntohs(asconf_ch->chunk_length); 4522 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4523 break; 4524 stcb = sctp_findassociation_ep_asconf(m, 4525 *offset, 4526 dst, 4527 sh, &inp, netp, vrf_id); 4528 if (stcb != NULL) 4529 break; 4530 asconf_offset += SCTP_SIZE32(asconf_len); 4531 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4532 sizeof(struct sctp_chunkhdr), chunk_buf); 4533 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4534 if (stcb == NULL) { 4535 /* 4536 * reduce inp's refcount if not reduced in 4537 * sctp_findassociation_ep_asconf(). 4538 */ 4539 SCTP_INP_DECR_REF(inp); 4540 } else { 4541 locked_tcb = stcb; 4542 } 4543 4544 /* now go back and verify any auth chunk to be sure */ 4545 if (auth_skipped && (stcb != NULL)) { 4546 struct sctp_auth_chunk *auth; 4547 4548 auth = (struct sctp_auth_chunk *) 4549 sctp_m_getptr(m, auth_offset, 4550 auth_len, chunk_buf); 4551 got_auth = 1; 4552 auth_skipped = 0; 4553 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4554 auth_offset)) { 4555 /* auth HMAC failed so dump it */ 4556 *offset = length; 4557 if (locked_tcb) { 4558 SCTP_TCB_UNLOCK(locked_tcb); 4559 } 4560 return (NULL); 4561 } else { 4562 /* remaining chunks are HMAC checked */ 4563 stcb->asoc.authenticated = 1; 4564 } 4565 } 4566 } 4567 if (stcb == NULL) { 4568 /* no association, so it's out of the blue... */ 4569 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, 4570 use_mflowid, mflowid, 4571 vrf_id, port); 4572 *offset = length; 4573 if (locked_tcb) { 4574 SCTP_TCB_UNLOCK(locked_tcb); 4575 } 4576 return (NULL); 4577 } 4578 asoc = &stcb->asoc; 4579 /* ABORT and SHUTDOWN can use either v_tag... */ 4580 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4581 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4582 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4583 if ((vtag_in == asoc->my_vtag) || 4584 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4585 (vtag_in == asoc->peer_vtag))) { 4586 /* this is valid */ 4587 } else { 4588 /* drop this packet... */ 4589 SCTP_STAT_INCR(sctps_badvtag); 4590 if (locked_tcb) { 4591 SCTP_TCB_UNLOCK(locked_tcb); 4592 } 4593 return (NULL); 4594 } 4595 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4596 if (vtag_in != asoc->my_vtag) { 4597 /* 4598 * this could be a stale SHUTDOWN-ACK or the 4599 * peer never got the SHUTDOWN-COMPLETE and 4600 * is still hung; we have started a new asoc 4601 * but it won't complete until the shutdown 4602 * is completed 4603 */ 4604 if (locked_tcb) { 4605 SCTP_TCB_UNLOCK(locked_tcb); 4606 } 4607 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4608 sh, inp, 4609 use_mflowid, mflowid, 4610 vrf_id, port); 4611 return (NULL); 4612 } 4613 } else { 4614 /* for all other chunks, vtag must match */ 4615 if (vtag_in != asoc->my_vtag) { 4616 /* invalid vtag... */ 4617 SCTPDBG(SCTP_DEBUG_INPUT3, 4618 "invalid vtag: %xh, expect %xh\n", 4619 vtag_in, asoc->my_vtag); 4620 SCTP_STAT_INCR(sctps_badvtag); 4621 if (locked_tcb) { 4622 SCTP_TCB_UNLOCK(locked_tcb); 4623 } 4624 *offset = length; 4625 return (NULL); 4626 } 4627 } 4628 } /* end if !SCTP_COOKIE_ECHO */ 4629 /* 4630 * process all control chunks... 4631 */ 4632 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4633 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4634 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4635 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4636 /* implied cookie-ack.. we must have lost the ack */ 4637 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4638 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4639 stcb->asoc.overall_error_count, 4640 0, 4641 SCTP_FROM_SCTP_INPUT, 4642 __LINE__); 4643 } 4644 stcb->asoc.overall_error_count = 0; 4645 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4646 *netp); 4647 } 4648 process_control_chunks: 4649 while (IS_SCTP_CONTROL(ch)) { 4650 /* validate chunk length */ 4651 chk_length = ntohs(ch->chunk_length); 4652 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4653 ch->chunk_type, chk_length); 4654 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4655 if (chk_length < sizeof(*ch) || 4656 (*offset + (int)chk_length) > length) { 4657 *offset = length; 4658 if (locked_tcb) { 4659 SCTP_TCB_UNLOCK(locked_tcb); 4660 } 4661 return (NULL); 4662 } 4663 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4664 /* 4665 * INIT-ACK only gets the init ack "header" portion only 4666 * because we don't have to process the peer's COOKIE. All 4667 * others get a complete chunk. 4668 */ 4669 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4670 (ch->chunk_type == SCTP_INITIATION)) { 4671 /* get an init-ack chunk */ 4672 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4673 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4674 if (ch == NULL) { 4675 *offset = length; 4676 if (locked_tcb) { 4677 SCTP_TCB_UNLOCK(locked_tcb); 4678 } 4679 return (NULL); 4680 } 4681 } else { 4682 /* For cookies and all other chunks. */ 4683 if (chk_length > sizeof(chunk_buf)) { 4684 /* 4685 * use just the size of the chunk buffer so 4686 * the front part of our chunks fit in 4687 * contiguous space up to the chunk buffer 4688 * size (508 bytes). For chunks that need to 4689 * get more than that they must use the 4690 * sctp_m_getptr() function or other means 4691 * (e.g. know how to parse mbuf chains). 4692 * Cookies do this already. 4693 */ 4694 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4695 (sizeof(chunk_buf) - 4), 4696 chunk_buf); 4697 if (ch == NULL) { 4698 *offset = length; 4699 if (locked_tcb) { 4700 SCTP_TCB_UNLOCK(locked_tcb); 4701 } 4702 return (NULL); 4703 } 4704 } else { 4705 /* We can fit it all */ 4706 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4707 chk_length, chunk_buf); 4708 if (ch == NULL) { 4709 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4710 *offset = length; 4711 if (locked_tcb) { 4712 SCTP_TCB_UNLOCK(locked_tcb); 4713 } 4714 return (NULL); 4715 } 4716 } 4717 } 4718 num_chunks++; 4719 /* Save off the last place we got a control from */ 4720 if (stcb != NULL) { 4721 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4722 /* 4723 * allow last_control to be NULL if 4724 * ASCONF... ASCONF processing will find the 4725 * right net later 4726 */ 4727 if ((netp != NULL) && (*netp != NULL)) 4728 stcb->asoc.last_control_chunk_from = *netp; 4729 } 4730 } 4731 #ifdef SCTP_AUDITING_ENABLED 4732 sctp_audit_log(0xB0, ch->chunk_type); 4733 #endif 4734 4735 /* check to see if this chunk required auth, but isn't */ 4736 if ((stcb != NULL) && 4737 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4738 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4739 !stcb->asoc.authenticated) { 4740 /* "silently" ignore */ 4741 SCTP_STAT_INCR(sctps_recvauthmissing); 4742 goto next_chunk; 4743 } 4744 switch (ch->chunk_type) { 4745 case SCTP_INITIATION: 4746 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4747 /* The INIT chunk must be the only chunk. */ 4748 if ((num_chunks > 1) || 4749 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4750 sctp_abort_association(inp, stcb, m, iphlen, 4751 src, dst, sh, NULL, 4752 use_mflowid, mflowid, 4753 vrf_id, port); 4754 *offset = length; 4755 return (NULL); 4756 } 4757 /* Honor our resource limit. */ 4758 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4759 struct mbuf *op_err; 4760 4761 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4762 sctp_abort_association(inp, stcb, m, iphlen, 4763 src, dst, sh, op_err, 4764 use_mflowid, mflowid, 4765 vrf_id, port); 4766 *offset = length; 4767 return (NULL); 4768 } 4769 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4770 (struct sctp_init_chunk *)ch, inp, 4771 stcb, &abort_no_unlock, 4772 use_mflowid, mflowid, 4773 vrf_id, port); 4774 *offset = length; 4775 if ((!abort_no_unlock) && (locked_tcb)) { 4776 SCTP_TCB_UNLOCK(locked_tcb); 4777 } 4778 return (NULL); 4779 break; 4780 case SCTP_PAD_CHUNK: 4781 break; 4782 case SCTP_INITIATION_ACK: 4783 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4784 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4785 /* We are not interested anymore */ 4786 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4787 ; 4788 } else { 4789 if (locked_tcb != stcb) { 4790 /* Very unlikely */ 4791 SCTP_TCB_UNLOCK(locked_tcb); 4792 } 4793 *offset = length; 4794 if (stcb) { 4795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4796 so = SCTP_INP_SO(inp); 4797 atomic_add_int(&stcb->asoc.refcnt, 1); 4798 SCTP_TCB_UNLOCK(stcb); 4799 SCTP_SOCKET_LOCK(so, 1); 4800 SCTP_TCB_LOCK(stcb); 4801 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4802 #endif 4803 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4804 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4805 SCTP_SOCKET_UNLOCK(so, 1); 4806 #endif 4807 } 4808 return (NULL); 4809 } 4810 } 4811 /* The INIT-ACK chunk must be the only chunk. */ 4812 if ((num_chunks > 1) || 4813 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4814 *offset = length; 4815 if (locked_tcb) { 4816 SCTP_TCB_UNLOCK(locked_tcb); 4817 } 4818 return (NULL); 4819 } 4820 if ((netp) && (*netp)) { 4821 ret = sctp_handle_init_ack(m, iphlen, *offset, 4822 src, dst, sh, 4823 (struct sctp_init_ack_chunk *)ch, 4824 stcb, *netp, 4825 &abort_no_unlock, 4826 use_mflowid, mflowid, 4827 vrf_id); 4828 } else { 4829 ret = -1; 4830 } 4831 *offset = length; 4832 if (abort_no_unlock) { 4833 return (NULL); 4834 } 4835 /* 4836 * Special case, I must call the output routine to 4837 * get the cookie echoed 4838 */ 4839 if ((stcb != NULL) && (ret == 0)) { 4840 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4841 } 4842 if (locked_tcb) { 4843 SCTP_TCB_UNLOCK(locked_tcb); 4844 } 4845 return (NULL); 4846 break; 4847 case SCTP_SELECTIVE_ACK: 4848 { 4849 struct sctp_sack_chunk *sack; 4850 int abort_now = 0; 4851 uint32_t a_rwnd, cum_ack; 4852 uint16_t num_seg, num_dup; 4853 uint8_t flags; 4854 int offset_seg, offset_dup; 4855 4856 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4857 SCTP_STAT_INCR(sctps_recvsacks); 4858 if (stcb == NULL) { 4859 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4860 break; 4861 } 4862 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4863 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4864 break; 4865 } 4866 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4867 /*- 4868 * If we have sent a shutdown-ack, we will pay no 4869 * attention to a sack sent in to us since 4870 * we don't care anymore. 4871 */ 4872 break; 4873 } 4874 sack = (struct sctp_sack_chunk *)ch; 4875 flags = ch->chunk_flags; 4876 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4877 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4878 num_dup = ntohs(sack->sack.num_dup_tsns); 4879 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4880 if (sizeof(struct sctp_sack_chunk) + 4881 num_seg * sizeof(struct sctp_gap_ack_block) + 4882 num_dup * sizeof(uint32_t) != chk_length) { 4883 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4884 break; 4885 } 4886 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4887 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4888 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4889 cum_ack, num_seg, a_rwnd); 4890 stcb->asoc.seen_a_sack_this_pkt = 1; 4891 if ((stcb->asoc.pr_sctp_cnt == 0) && 4892 (num_seg == 0) && 4893 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4894 (stcb->asoc.saw_sack_with_frags == 0) && 4895 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4896 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4897 ) { 4898 /* 4899 * We have a SIMPLE sack having no 4900 * prior segments and data on sent 4901 * queue to be acked.. Use the 4902 * faster path sack processing. We 4903 * also allow window update sacks 4904 * with no missing segments to go 4905 * this way too. 4906 */ 4907 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4908 } else { 4909 if (netp && *netp) 4910 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4911 num_seg, 0, num_dup, &abort_now, flags, 4912 cum_ack, a_rwnd, ecne_seen); 4913 } 4914 if (abort_now) { 4915 /* ABORT signal from sack processing */ 4916 *offset = length; 4917 return (NULL); 4918 } 4919 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4920 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4921 (stcb->asoc.stream_queue_cnt == 0)) { 4922 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4923 } 4924 } 4925 break; 4926 /* 4927 * EY - nr_sack: If the received chunk is an 4928 * nr_sack chunk 4929 */ 4930 case SCTP_NR_SELECTIVE_ACK: 4931 { 4932 struct sctp_nr_sack_chunk *nr_sack; 4933 int abort_now = 0; 4934 uint32_t a_rwnd, cum_ack; 4935 uint16_t num_seg, num_nr_seg, num_dup; 4936 uint8_t flags; 4937 int offset_seg, offset_dup; 4938 4939 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4940 SCTP_STAT_INCR(sctps_recvsacks); 4941 if (stcb == NULL) { 4942 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4943 break; 4944 } 4945 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4946 (stcb->asoc.peer_supports_nr_sack == 0)) { 4947 goto unknown_chunk; 4948 } 4949 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4950 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4951 break; 4952 } 4953 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4954 /*- 4955 * If we have sent a shutdown-ack, we will pay no 4956 * attention to a sack sent in to us since 4957 * we don't care anymore. 4958 */ 4959 break; 4960 } 4961 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4962 flags = ch->chunk_flags; 4963 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4964 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4965 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4966 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4967 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4968 if (sizeof(struct sctp_nr_sack_chunk) + 4969 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4970 num_dup * sizeof(uint32_t) != chk_length) { 4971 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4972 break; 4973 } 4974 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4975 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4976 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4977 cum_ack, num_seg, a_rwnd); 4978 stcb->asoc.seen_a_sack_this_pkt = 1; 4979 if ((stcb->asoc.pr_sctp_cnt == 0) && 4980 (num_seg == 0) && (num_nr_seg == 0) && 4981 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4982 (stcb->asoc.saw_sack_with_frags == 0) && 4983 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4984 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4985 /* 4986 * We have a SIMPLE sack having no 4987 * prior segments and data on sent 4988 * queue to be acked. Use the faster 4989 * path sack processing. We also 4990 * allow window update sacks with no 4991 * missing segments to go this way 4992 * too. 4993 */ 4994 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4995 &abort_now, ecne_seen); 4996 } else { 4997 if (netp && *netp) 4998 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4999 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5000 cum_ack, a_rwnd, ecne_seen); 5001 } 5002 if (abort_now) { 5003 /* ABORT signal from sack processing */ 5004 *offset = length; 5005 return (NULL); 5006 } 5007 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5008 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5009 (stcb->asoc.stream_queue_cnt == 0)) { 5010 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5011 } 5012 } 5013 break; 5014 5015 case SCTP_HEARTBEAT_REQUEST: 5016 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5017 if ((stcb) && netp && *netp) { 5018 SCTP_STAT_INCR(sctps_recvheartbeat); 5019 sctp_send_heartbeat_ack(stcb, m, *offset, 5020 chk_length, *netp); 5021 5022 /* He's alive so give him credit */ 5023 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5024 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5025 stcb->asoc.overall_error_count, 5026 0, 5027 SCTP_FROM_SCTP_INPUT, 5028 __LINE__); 5029 } 5030 stcb->asoc.overall_error_count = 0; 5031 } 5032 break; 5033 case SCTP_HEARTBEAT_ACK: 5034 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5035 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5036 /* Its not ours */ 5037 *offset = length; 5038 if (locked_tcb) { 5039 SCTP_TCB_UNLOCK(locked_tcb); 5040 } 5041 return (NULL); 5042 } 5043 /* He's alive so give him credit */ 5044 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5045 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5046 stcb->asoc.overall_error_count, 5047 0, 5048 SCTP_FROM_SCTP_INPUT, 5049 __LINE__); 5050 } 5051 stcb->asoc.overall_error_count = 0; 5052 SCTP_STAT_INCR(sctps_recvheartbeatack); 5053 if (netp && *netp) 5054 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5055 stcb, *netp); 5056 break; 5057 case SCTP_ABORT_ASSOCIATION: 5058 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5059 (void *)stcb); 5060 if ((stcb) && netp && *netp) 5061 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5062 stcb, *netp); 5063 *offset = length; 5064 return (NULL); 5065 break; 5066 case SCTP_SHUTDOWN: 5067 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5068 (void *)stcb); 5069 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5070 *offset = length; 5071 if (locked_tcb) { 5072 SCTP_TCB_UNLOCK(locked_tcb); 5073 } 5074 return (NULL); 5075 } 5076 if (netp && *netp) { 5077 int abort_flag = 0; 5078 5079 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5080 stcb, *netp, &abort_flag); 5081 if (abort_flag) { 5082 *offset = length; 5083 return (NULL); 5084 } 5085 } 5086 break; 5087 case SCTP_SHUTDOWN_ACK: 5088 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5089 if ((stcb) && (netp) && (*netp)) 5090 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5091 *offset = length; 5092 return (NULL); 5093 break; 5094 5095 case SCTP_OPERATION_ERROR: 5096 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5097 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5098 *offset = length; 5099 return (NULL); 5100 } 5101 break; 5102 case SCTP_COOKIE_ECHO: 5103 SCTPDBG(SCTP_DEBUG_INPUT3, 5104 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5105 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5106 ; 5107 } else { 5108 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5109 /* We are not interested anymore */ 5110 abend: 5111 if (stcb) { 5112 SCTP_TCB_UNLOCK(stcb); 5113 } 5114 *offset = length; 5115 return (NULL); 5116 } 5117 } 5118 /* 5119 * First are we accepting? We do this again here 5120 * since it is possible that a previous endpoint WAS 5121 * listening responded to a INIT-ACK and then 5122 * closed. We opened and bound.. and are now no 5123 * longer listening. 5124 */ 5125 5126 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5127 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5128 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5129 struct mbuf *op_err; 5130 5131 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5132 sctp_abort_association(inp, stcb, m, iphlen, 5133 src, dst, sh, op_err, 5134 use_mflowid, mflowid, 5135 vrf_id, port); 5136 } 5137 *offset = length; 5138 return (NULL); 5139 } else { 5140 struct mbuf *ret_buf; 5141 struct sctp_inpcb *linp; 5142 5143 if (stcb) { 5144 linp = NULL; 5145 } else { 5146 linp = inp; 5147 } 5148 5149 if (linp) { 5150 SCTP_ASOC_CREATE_LOCK(linp); 5151 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5152 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5153 SCTP_ASOC_CREATE_UNLOCK(linp); 5154 goto abend; 5155 } 5156 } 5157 if (netp) { 5158 ret_buf = 5159 sctp_handle_cookie_echo(m, iphlen, 5160 *offset, 5161 src, dst, 5162 sh, 5163 (struct sctp_cookie_echo_chunk *)ch, 5164 &inp, &stcb, netp, 5165 auth_skipped, 5166 auth_offset, 5167 auth_len, 5168 &locked_tcb, 5169 use_mflowid, 5170 mflowid, 5171 vrf_id, 5172 port); 5173 } else { 5174 ret_buf = NULL; 5175 } 5176 if (linp) { 5177 SCTP_ASOC_CREATE_UNLOCK(linp); 5178 } 5179 if (ret_buf == NULL) { 5180 if (locked_tcb) { 5181 SCTP_TCB_UNLOCK(locked_tcb); 5182 } 5183 SCTPDBG(SCTP_DEBUG_INPUT3, 5184 "GAK, null buffer\n"); 5185 *offset = length; 5186 return (NULL); 5187 } 5188 /* if AUTH skipped, see if it verified... */ 5189 if (auth_skipped) { 5190 got_auth = 1; 5191 auth_skipped = 0; 5192 } 5193 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5194 /* 5195 * Restart the timer if we have 5196 * pending data 5197 */ 5198 struct sctp_tmit_chunk *chk; 5199 5200 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5201 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5202 } 5203 } 5204 break; 5205 case SCTP_COOKIE_ACK: 5206 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5207 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5208 if (locked_tcb) { 5209 SCTP_TCB_UNLOCK(locked_tcb); 5210 } 5211 return (NULL); 5212 } 5213 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5214 /* We are not interested anymore */ 5215 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5216 ; 5217 } else if (stcb) { 5218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5219 so = SCTP_INP_SO(inp); 5220 atomic_add_int(&stcb->asoc.refcnt, 1); 5221 SCTP_TCB_UNLOCK(stcb); 5222 SCTP_SOCKET_LOCK(so, 1); 5223 SCTP_TCB_LOCK(stcb); 5224 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5225 #endif 5226 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5228 SCTP_SOCKET_UNLOCK(so, 1); 5229 #endif 5230 *offset = length; 5231 return (NULL); 5232 } 5233 } 5234 /* He's alive so give him credit */ 5235 if ((stcb) && netp && *netp) { 5236 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5237 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5238 stcb->asoc.overall_error_count, 5239 0, 5240 SCTP_FROM_SCTP_INPUT, 5241 __LINE__); 5242 } 5243 stcb->asoc.overall_error_count = 0; 5244 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5245 } 5246 break; 5247 case SCTP_ECN_ECHO: 5248 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5249 /* He's alive so give him credit */ 5250 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5251 /* Its not ours */ 5252 if (locked_tcb) { 5253 SCTP_TCB_UNLOCK(locked_tcb); 5254 } 5255 *offset = length; 5256 return (NULL); 5257 } 5258 if (stcb) { 5259 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5260 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5261 stcb->asoc.overall_error_count, 5262 0, 5263 SCTP_FROM_SCTP_INPUT, 5264 __LINE__); 5265 } 5266 stcb->asoc.overall_error_count = 0; 5267 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5268 stcb); 5269 ecne_seen = 1; 5270 } 5271 break; 5272 case SCTP_ECN_CWR: 5273 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5274 /* He's alive so give him credit */ 5275 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5276 /* Its not ours */ 5277 if (locked_tcb) { 5278 SCTP_TCB_UNLOCK(locked_tcb); 5279 } 5280 *offset = length; 5281 return (NULL); 5282 } 5283 if (stcb) { 5284 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5285 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5286 stcb->asoc.overall_error_count, 5287 0, 5288 SCTP_FROM_SCTP_INPUT, 5289 __LINE__); 5290 } 5291 stcb->asoc.overall_error_count = 0; 5292 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5293 } 5294 break; 5295 case SCTP_SHUTDOWN_COMPLETE: 5296 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5297 /* must be first and only chunk */ 5298 if ((num_chunks > 1) || 5299 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5300 *offset = length; 5301 if (locked_tcb) { 5302 SCTP_TCB_UNLOCK(locked_tcb); 5303 } 5304 return (NULL); 5305 } 5306 if ((stcb) && netp && *netp) { 5307 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5308 stcb, *netp); 5309 } 5310 *offset = length; 5311 return (NULL); 5312 break; 5313 case SCTP_ASCONF: 5314 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5315 /* He's alive so give him credit */ 5316 if (stcb) { 5317 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5318 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5319 stcb->asoc.overall_error_count, 5320 0, 5321 SCTP_FROM_SCTP_INPUT, 5322 __LINE__); 5323 } 5324 stcb->asoc.overall_error_count = 0; 5325 sctp_handle_asconf(m, *offset, src, 5326 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5327 asconf_cnt++; 5328 } 5329 break; 5330 case SCTP_ASCONF_ACK: 5331 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5332 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5333 /* Its not ours */ 5334 if (locked_tcb) { 5335 SCTP_TCB_UNLOCK(locked_tcb); 5336 } 5337 *offset = length; 5338 return (NULL); 5339 } 5340 if ((stcb) && netp && *netp) { 5341 /* He's alive so give him credit */ 5342 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5343 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5344 stcb->asoc.overall_error_count, 5345 0, 5346 SCTP_FROM_SCTP_INPUT, 5347 __LINE__); 5348 } 5349 stcb->asoc.overall_error_count = 0; 5350 sctp_handle_asconf_ack(m, *offset, 5351 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5352 if (abort_no_unlock) 5353 return (NULL); 5354 } 5355 break; 5356 case SCTP_FORWARD_CUM_TSN: 5357 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5358 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5359 /* Its not ours */ 5360 if (locked_tcb) { 5361 SCTP_TCB_UNLOCK(locked_tcb); 5362 } 5363 *offset = length; 5364 return (NULL); 5365 } 5366 /* He's alive so give him credit */ 5367 if (stcb) { 5368 int abort_flag = 0; 5369 5370 stcb->asoc.overall_error_count = 0; 5371 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5372 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5373 stcb->asoc.overall_error_count, 5374 0, 5375 SCTP_FROM_SCTP_INPUT, 5376 __LINE__); 5377 } 5378 *fwd_tsn_seen = 1; 5379 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5380 /* We are not interested anymore */ 5381 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5382 so = SCTP_INP_SO(inp); 5383 atomic_add_int(&stcb->asoc.refcnt, 1); 5384 SCTP_TCB_UNLOCK(stcb); 5385 SCTP_SOCKET_LOCK(so, 1); 5386 SCTP_TCB_LOCK(stcb); 5387 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5388 #endif 5389 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5390 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5391 SCTP_SOCKET_UNLOCK(so, 1); 5392 #endif 5393 *offset = length; 5394 return (NULL); 5395 } 5396 sctp_handle_forward_tsn(stcb, 5397 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5398 if (abort_flag) { 5399 *offset = length; 5400 return (NULL); 5401 } else { 5402 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5403 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5404 stcb->asoc.overall_error_count, 5405 0, 5406 SCTP_FROM_SCTP_INPUT, 5407 __LINE__); 5408 } 5409 stcb->asoc.overall_error_count = 0; 5410 } 5411 5412 } 5413 break; 5414 case SCTP_STREAM_RESET: 5415 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5416 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5417 /* Its not ours */ 5418 if (locked_tcb) { 5419 SCTP_TCB_UNLOCK(locked_tcb); 5420 } 5421 *offset = length; 5422 return (NULL); 5423 } 5424 if (stcb->asoc.peer_supports_strreset == 0) { 5425 /* 5426 * hmm, peer should have announced this, but 5427 * we will turn it on since he is sending us 5428 * a stream reset. 5429 */ 5430 stcb->asoc.peer_supports_strreset = 1; 5431 } 5432 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5433 /* stop processing */ 5434 *offset = length; 5435 return (NULL); 5436 } 5437 break; 5438 case SCTP_PACKET_DROPPED: 5439 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5440 /* re-get it all please */ 5441 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5442 /* Its not ours */ 5443 if (locked_tcb) { 5444 SCTP_TCB_UNLOCK(locked_tcb); 5445 } 5446 *offset = length; 5447 return (NULL); 5448 } 5449 if (ch && (stcb) && netp && (*netp)) { 5450 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5451 stcb, *netp, 5452 min(chk_length, (sizeof(chunk_buf) - 4))); 5453 5454 } 5455 break; 5456 5457 case SCTP_AUTHENTICATION: 5458 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5459 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5460 goto unknown_chunk; 5461 5462 if (stcb == NULL) { 5463 /* save the first AUTH for later processing */ 5464 if (auth_skipped == 0) { 5465 auth_offset = *offset; 5466 auth_len = chk_length; 5467 auth_skipped = 1; 5468 } 5469 /* skip this chunk (temporarily) */ 5470 goto next_chunk; 5471 } 5472 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5473 (chk_length > (sizeof(struct sctp_auth_chunk) + 5474 SCTP_AUTH_DIGEST_LEN_MAX))) { 5475 /* Its not ours */ 5476 if (locked_tcb) { 5477 SCTP_TCB_UNLOCK(locked_tcb); 5478 } 5479 *offset = length; 5480 return (NULL); 5481 } 5482 if (got_auth == 1) { 5483 /* skip this chunk... it's already auth'd */ 5484 goto next_chunk; 5485 } 5486 got_auth = 1; 5487 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5488 m, *offset)) { 5489 /* auth HMAC failed so dump the packet */ 5490 *offset = length; 5491 return (stcb); 5492 } else { 5493 /* remaining chunks are HMAC checked */ 5494 stcb->asoc.authenticated = 1; 5495 } 5496 break; 5497 5498 default: 5499 unknown_chunk: 5500 /* it's an unknown chunk! */ 5501 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5502 struct mbuf *mm; 5503 struct sctp_paramhdr *phd; 5504 5505 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5506 0, M_DONTWAIT, 1, MT_DATA); 5507 if (mm) { 5508 phd = mtod(mm, struct sctp_paramhdr *); 5509 /* 5510 * We cheat and use param type since 5511 * we did not bother to define a 5512 * error cause struct. They are the 5513 * same basic format with different 5514 * names. 5515 */ 5516 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5517 phd->param_length = htons(chk_length + sizeof(*phd)); 5518 SCTP_BUF_LEN(mm) = sizeof(*phd); 5519 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5520 if (SCTP_BUF_NEXT(mm)) { 5521 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5522 sctp_m_freem(mm); 5523 } else { 5524 #ifdef SCTP_MBUF_LOGGING 5525 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5526 struct mbuf *mat; 5527 5528 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5529 if (SCTP_BUF_IS_EXTENDED(mat)) { 5530 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5531 } 5532 } 5533 } 5534 #endif 5535 sctp_queue_op_err(stcb, mm); 5536 } 5537 } else { 5538 sctp_m_freem(mm); 5539 } 5540 } 5541 } 5542 if ((ch->chunk_type & 0x80) == 0) { 5543 /* discard this packet */ 5544 *offset = length; 5545 return (stcb); 5546 } /* else skip this bad chunk and continue... */ 5547 break; 5548 } /* switch (ch->chunk_type) */ 5549 5550 5551 next_chunk: 5552 /* get the next chunk */ 5553 *offset += SCTP_SIZE32(chk_length); 5554 if (*offset >= length) { 5555 /* no more data left in the mbuf chain */ 5556 break; 5557 } 5558 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5559 sizeof(struct sctp_chunkhdr), chunk_buf); 5560 if (ch == NULL) { 5561 if (locked_tcb) { 5562 SCTP_TCB_UNLOCK(locked_tcb); 5563 } 5564 *offset = length; 5565 return (NULL); 5566 } 5567 } /* while */ 5568 5569 if (asconf_cnt > 0 && stcb != NULL) { 5570 sctp_send_asconf_ack(stcb); 5571 } 5572 return (stcb); 5573 } 5574 5575 5576 #ifdef INVARIANTS 5577 #ifdef __GNUC__ 5578 __attribute__((noinline)) 5579 #endif 5580 void 5581 sctp_validate_no_locks(struct sctp_inpcb *inp) 5582 { 5583 struct sctp_tcb *lstcb; 5584 5585 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5586 if (mtx_owned(&lstcb->tcb_mtx)) { 5587 panic("Own lock on stcb at return from input"); 5588 } 5589 } 5590 if (mtx_owned(&inp->inp_create_mtx)) { 5591 panic("Own create lock on inp"); 5592 } 5593 if (mtx_owned(&inp->inp_mtx)) { 5594 panic("Own inp lock on inp"); 5595 } 5596 } 5597 5598 #endif 5599 5600 /* 5601 * common input chunk processing (v4 and v6) 5602 */ 5603 void 5604 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5605 struct sockaddr *src, struct sockaddr *dst, 5606 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5607 #if !defined(SCTP_WITH_NO_CSUM) 5608 uint8_t compute_crc, 5609 #endif 5610 uint8_t ecn_bits, 5611 uint8_t use_mflowid, uint32_t mflowid, 5612 uint32_t vrf_id, uint16_t port) 5613 { 5614 uint32_t high_tsn; 5615 int fwd_tsn_seen = 0, data_processed = 0; 5616 struct mbuf *m = *mm; 5617 int un_sent; 5618 int cnt_ctrl_ready = 0; 5619 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5620 struct sctp_tcb *stcb = NULL; 5621 struct sctp_nets *net = NULL; 5622 5623 SCTP_STAT_INCR(sctps_recvdatagrams); 5624 #ifdef SCTP_AUDITING_ENABLED 5625 sctp_audit_log(0xE0, 1); 5626 sctp_auditing(0, inp, stcb, net); 5627 #endif 5628 #if !defined(SCTP_WITH_NO_CSUM) 5629 if (compute_crc != 0) { 5630 uint32_t check, calc_check; 5631 5632 check = sh->checksum; 5633 sh->checksum = 0; 5634 calc_check = sctp_calculate_cksum(m, iphlen); 5635 sh->checksum = check; 5636 if (calc_check != check) { 5637 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5638 calc_check, check, (void *)m, length, iphlen); 5639 stcb = sctp_findassociation_addr(m, offset, src, dst, 5640 sh, ch, &inp, &net, vrf_id); 5641 if ((net != NULL) && (port != 0)) { 5642 if (net->port == 0) { 5643 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5644 } 5645 net->port = port; 5646 } 5647 if ((net != NULL) && (use_mflowid != 0)) { 5648 net->flowid = mflowid; 5649 #ifdef INVARIANTS 5650 net->flowidset = 1; 5651 #endif 5652 } 5653 if ((inp != NULL) && (stcb != NULL)) { 5654 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5655 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5656 } else if ((inp != NULL) && (stcb == NULL)) { 5657 inp_decr = inp; 5658 } 5659 SCTP_STAT_INCR(sctps_badsum); 5660 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5661 goto out; 5662 } 5663 } 5664 #endif 5665 /* Destination port of 0 is illegal, based on RFC4960. */ 5666 if (sh->dest_port == 0) { 5667 SCTP_STAT_INCR(sctps_hdrops); 5668 goto out; 5669 } 5670 stcb = sctp_findassociation_addr(m, offset, src, dst, 5671 sh, ch, &inp, &net, vrf_id); 5672 if ((net != NULL) && (port != 0)) { 5673 if (net->port == 0) { 5674 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5675 } 5676 net->port = port; 5677 } 5678 if ((net != NULL) && (use_mflowid != 0)) { 5679 net->flowid = mflowid; 5680 #ifdef INVARIANTS 5681 net->flowidset = 1; 5682 #endif 5683 } 5684 if (inp == NULL) { 5685 SCTP_STAT_INCR(sctps_noport); 5686 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5687 goto out; 5688 } 5689 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5690 sctp_send_shutdown_complete2(src, dst, sh, 5691 use_mflowid, mflowid, 5692 vrf_id, port); 5693 goto out; 5694 } 5695 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5696 goto out; 5697 } 5698 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5699 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5700 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5701 (ch->chunk_type != SCTP_INIT))) { 5702 sctp_send_abort(m, iphlen, src, dst, 5703 sh, 0, NULL, 5704 use_mflowid, mflowid, 5705 vrf_id, port); 5706 } 5707 } 5708 goto out; 5709 } else if (stcb == NULL) { 5710 inp_decr = inp; 5711 } 5712 #ifdef IPSEC 5713 /*- 5714 * I very much doubt any of the IPSEC stuff will work but I have no 5715 * idea, so I will leave it in place. 5716 */ 5717 if (inp != NULL) { 5718 switch (dst->sa_family) { 5719 #ifdef INET 5720 case AF_INET: 5721 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5722 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5723 SCTP_STAT_INCR(sctps_hdrops); 5724 goto out; 5725 } 5726 break; 5727 #endif 5728 #ifdef INET6 5729 case AF_INET6: 5730 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5731 MODULE_GLOBAL(ipsec6stat).in_polvio++; 5732 SCTP_STAT_INCR(sctps_hdrops); 5733 goto out; 5734 } 5735 break; 5736 #endif 5737 default: 5738 break; 5739 } 5740 } 5741 #endif 5742 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5743 (void *)m, iphlen, offset, length, (void *)stcb); 5744 if (stcb) { 5745 /* always clear this before beginning a packet */ 5746 stcb->asoc.authenticated = 0; 5747 stcb->asoc.seen_a_sack_this_pkt = 0; 5748 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5749 (void *)stcb, stcb->asoc.state); 5750 5751 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5752 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5753 /*- 5754 * If we hit here, we had a ref count 5755 * up when the assoc was aborted and the 5756 * timer is clearing out the assoc, we should 5757 * NOT respond to any packet.. its OOTB. 5758 */ 5759 SCTP_TCB_UNLOCK(stcb); 5760 stcb = NULL; 5761 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5762 use_mflowid, mflowid, 5763 vrf_id, port); 5764 goto out; 5765 } 5766 } 5767 if (IS_SCTP_CONTROL(ch)) { 5768 /* process the control portion of the SCTP packet */ 5769 /* sa_ignore NO_NULL_CHK */ 5770 stcb = sctp_process_control(m, iphlen, &offset, length, 5771 src, dst, sh, ch, 5772 inp, stcb, &net, &fwd_tsn_seen, 5773 use_mflowid, mflowid, 5774 vrf_id, port); 5775 if (stcb) { 5776 /* 5777 * This covers us if the cookie-echo was there and 5778 * it changes our INP. 5779 */ 5780 inp = stcb->sctp_ep; 5781 if ((net) && (port)) { 5782 if (net->port == 0) { 5783 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5784 } 5785 net->port = port; 5786 } 5787 } 5788 } else { 5789 /* 5790 * no control chunks, so pre-process DATA chunks (these 5791 * checks are taken care of by control processing) 5792 */ 5793 5794 /* 5795 * if DATA only packet, and auth is required, then punt... 5796 * can't have authenticated without any AUTH (control) 5797 * chunks 5798 */ 5799 if ((stcb != NULL) && 5800 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5801 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5802 /* "silently" ignore */ 5803 SCTP_STAT_INCR(sctps_recvauthmissing); 5804 goto out; 5805 } 5806 if (stcb == NULL) { 5807 /* out of the blue DATA chunk */ 5808 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5809 use_mflowid, mflowid, 5810 vrf_id, port); 5811 goto out; 5812 } 5813 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5814 /* v_tag mismatch! */ 5815 SCTP_STAT_INCR(sctps_badvtag); 5816 goto out; 5817 } 5818 } 5819 5820 if (stcb == NULL) { 5821 /* 5822 * no valid TCB for this packet, or we found it's a bad 5823 * packet while processing control, or we're done with this 5824 * packet (done or skip rest of data), so we drop it... 5825 */ 5826 goto out; 5827 } 5828 /* 5829 * DATA chunk processing 5830 */ 5831 /* plow through the data chunks while length > offset */ 5832 5833 /* 5834 * Rest should be DATA only. Check authentication state if AUTH for 5835 * DATA is required. 5836 */ 5837 if ((length > offset) && 5838 (stcb != NULL) && 5839 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5840 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5841 !stcb->asoc.authenticated) { 5842 /* "silently" ignore */ 5843 SCTP_STAT_INCR(sctps_recvauthmissing); 5844 SCTPDBG(SCTP_DEBUG_AUTH1, 5845 "Data chunk requires AUTH, skipped\n"); 5846 goto trigger_send; 5847 } 5848 if (length > offset) { 5849 int retval; 5850 5851 /* 5852 * First check to make sure our state is correct. We would 5853 * not get here unless we really did have a tag, so we don't 5854 * abort if this happens, just dump the chunk silently. 5855 */ 5856 switch (SCTP_GET_STATE(&stcb->asoc)) { 5857 case SCTP_STATE_COOKIE_ECHOED: 5858 /* 5859 * we consider data with valid tags in this state 5860 * shows us the cookie-ack was lost. Imply it was 5861 * there. 5862 */ 5863 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5864 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5865 stcb->asoc.overall_error_count, 5866 0, 5867 SCTP_FROM_SCTP_INPUT, 5868 __LINE__); 5869 } 5870 stcb->asoc.overall_error_count = 0; 5871 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5872 break; 5873 case SCTP_STATE_COOKIE_WAIT: 5874 /* 5875 * We consider OOTB any data sent during asoc setup. 5876 */ 5877 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5878 use_mflowid, mflowid, 5879 vrf_id, port); 5880 goto out; 5881 /* sa_ignore NOTREACHED */ 5882 break; 5883 case SCTP_STATE_EMPTY: /* should not happen */ 5884 case SCTP_STATE_INUSE: /* should not happen */ 5885 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5886 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5887 default: 5888 goto out; 5889 /* sa_ignore NOTREACHED */ 5890 break; 5891 case SCTP_STATE_OPEN: 5892 case SCTP_STATE_SHUTDOWN_SENT: 5893 break; 5894 } 5895 /* plow through the data chunks while length > offset */ 5896 retval = sctp_process_data(mm, iphlen, &offset, length, 5897 src, dst, sh, 5898 inp, stcb, net, &high_tsn, 5899 use_mflowid, mflowid, 5900 vrf_id, port); 5901 if (retval == 2) { 5902 /* 5903 * The association aborted, NO UNLOCK needed since 5904 * the association is destroyed. 5905 */ 5906 stcb = NULL; 5907 goto out; 5908 } 5909 data_processed = 1; 5910 /* 5911 * Anything important needs to have been m_copy'ed in 5912 * process_data 5913 */ 5914 } 5915 /* take care of ecn */ 5916 if ((data_processed == 1) && 5917 (stcb->asoc.ecn_allowed == 1) && 5918 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5919 /* Yep, we need to add a ECNE */ 5920 sctp_send_ecn_echo(stcb, net, high_tsn); 5921 } 5922 if ((data_processed == 0) && (fwd_tsn_seen)) { 5923 int was_a_gap; 5924 uint32_t highest_tsn; 5925 5926 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5927 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5928 } else { 5929 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5930 } 5931 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5932 stcb->asoc.send_sack = 1; 5933 sctp_sack_check(stcb, was_a_gap); 5934 } else if (fwd_tsn_seen) { 5935 stcb->asoc.send_sack = 1; 5936 } 5937 /* trigger send of any chunks in queue... */ 5938 trigger_send: 5939 #ifdef SCTP_AUDITING_ENABLED 5940 sctp_audit_log(0xE0, 2); 5941 sctp_auditing(1, inp, stcb, net); 5942 #endif 5943 SCTPDBG(SCTP_DEBUG_INPUT1, 5944 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5945 stcb->asoc.peers_rwnd, 5946 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5947 stcb->asoc.total_flight); 5948 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5949 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5950 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5951 } 5952 if (cnt_ctrl_ready || 5953 ((un_sent) && 5954 (stcb->asoc.peers_rwnd > 0 || 5955 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5956 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5957 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5958 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5959 } 5960 #ifdef SCTP_AUDITING_ENABLED 5961 sctp_audit_log(0xE0, 3); 5962 sctp_auditing(2, inp, stcb, net); 5963 #endif 5964 out: 5965 if (stcb != NULL) { 5966 SCTP_TCB_UNLOCK(stcb); 5967 } 5968 if (inp_decr != NULL) { 5969 /* reduce ref-count */ 5970 SCTP_INP_WLOCK(inp_decr); 5971 SCTP_INP_DECR_REF(inp_decr); 5972 SCTP_INP_WUNLOCK(inp_decr); 5973 } 5974 #ifdef INVARIANTS 5975 if (inp != NULL) { 5976 sctp_validate_no_locks(inp); 5977 } 5978 #endif 5979 return; 5980 } 5981 5982 #if 0 5983 static void 5984 sctp_print_mbuf_chain(struct mbuf *m) 5985 { 5986 for (; m; m = SCTP_BUF_NEXT(m)) { 5987 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5988 if (SCTP_BUF_IS_EXTENDED(m)) 5989 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5990 } 5991 } 5992 5993 #endif 5994 5995 #ifdef INET 5996 void 5997 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5998 { 5999 struct mbuf *m; 6000 int iphlen; 6001 uint32_t vrf_id = 0; 6002 uint8_t ecn_bits; 6003 struct sockaddr_in src, dst; 6004 struct ip *ip; 6005 struct sctphdr *sh; 6006 struct sctp_chunkhdr *ch; 6007 int length, offset; 6008 6009 #if !defined(SCTP_WITH_NO_CSUM) 6010 uint8_t compute_crc; 6011 6012 #endif 6013 uint32_t mflowid; 6014 uint8_t use_mflowid; 6015 6016 iphlen = off; 6017 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6018 SCTP_RELEASE_PKT(i_pak); 6019 return; 6020 } 6021 m = SCTP_HEADER_TO_CHAIN(i_pak); 6022 #ifdef SCTP_MBUF_LOGGING 6023 /* Log in any input mbufs */ 6024 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6025 struct mbuf *mat; 6026 6027 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6028 if (SCTP_BUF_IS_EXTENDED(mat)) { 6029 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6030 } 6031 } 6032 } 6033 #endif 6034 #ifdef SCTP_PACKET_LOGGING 6035 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6036 sctp_packet_log(m); 6037 } 6038 #endif 6039 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6040 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 6041 m->m_pkthdr.len, 6042 if_name(m->m_pkthdr.rcvif), 6043 m->m_pkthdr.csum_flags); 6044 if (m->m_flags & M_FLOWID) { 6045 mflowid = m->m_pkthdr.flowid; 6046 use_mflowid = 1; 6047 } else { 6048 mflowid = 0; 6049 use_mflowid = 0; 6050 } 6051 SCTP_STAT_INCR(sctps_recvpackets); 6052 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6053 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6054 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6055 if (SCTP_BUF_LEN(m) < offset) { 6056 if ((m = m_pullup(m, offset)) == NULL) { 6057 SCTP_STAT_INCR(sctps_hdrops); 6058 return; 6059 } 6060 } 6061 ip = mtod(m, struct ip *); 6062 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6063 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6064 offset -= sizeof(struct sctp_chunkhdr); 6065 memset(&src, 0, sizeof(struct sockaddr_in)); 6066 src.sin_family = AF_INET; 6067 src.sin_len = sizeof(struct sockaddr_in); 6068 src.sin_port = sh->src_port; 6069 src.sin_addr = ip->ip_src; 6070 memset(&dst, 0, sizeof(struct sockaddr_in)); 6071 dst.sin_family = AF_INET; 6072 dst.sin_len = sizeof(struct sockaddr_in); 6073 dst.sin_port = sh->dest_port; 6074 dst.sin_addr = ip->ip_dst; 6075 length = ip->ip_len + iphlen; 6076 /* Validate mbuf chain length with IP payload length. */ 6077 if (SCTP_HEADER_LEN(m) != length) { 6078 SCTPDBG(SCTP_DEBUG_INPUT1, 6079 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6080 SCTP_STAT_INCR(sctps_hdrops); 6081 goto out; 6082 } 6083 /* SCTP does not allow broadcasts or multicasts */ 6084 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6085 goto out; 6086 } 6087 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6088 goto out; 6089 } 6090 ecn_bits = ip->ip_tos; 6091 #if defined(SCTP_WITH_NO_CSUM) 6092 SCTP_STAT_INCR(sctps_recvnocrc); 6093 #else 6094 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6095 SCTP_STAT_INCR(sctps_recvhwcrc); 6096 compute_crc = 0; 6097 } else { 6098 SCTP_STAT_INCR(sctps_recvswcrc); 6099 compute_crc = 1; 6100 } 6101 #endif 6102 sctp_common_input_processing(&m, iphlen, offset, length, 6103 (struct sockaddr *)&src, 6104 (struct sockaddr *)&dst, 6105 sh, ch, 6106 #if !defined(SCTP_WITH_NO_CSUM) 6107 compute_crc, 6108 #endif 6109 ecn_bits, 6110 use_mflowid, mflowid, 6111 vrf_id, port); 6112 out: 6113 if (m) { 6114 sctp_m_freem(m); 6115 } 6116 return; 6117 } 6118 6119 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6120 extern int *sctp_cpuarry; 6121 6122 #endif 6123 6124 void 6125 sctp_input(struct mbuf *m, int off) 6126 { 6127 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6128 struct ip *ip; 6129 struct sctphdr *sh; 6130 int offset; 6131 int cpu_to_use; 6132 uint32_t flowid, tag; 6133 6134 if (mp_ncpus > 1) { 6135 if (m->m_flags & M_FLOWID) { 6136 flowid = m->m_pkthdr.flowid; 6137 } else { 6138 /* 6139 * No flow id built by lower layers fix it so we 6140 * create one. 6141 */ 6142 offset = off + sizeof(struct sctphdr); 6143 if (SCTP_BUF_LEN(m) < offset) { 6144 if ((m = m_pullup(m, offset)) == NULL) { 6145 SCTP_STAT_INCR(sctps_hdrops); 6146 return; 6147 } 6148 } 6149 ip = mtod(m, struct ip *); 6150 sh = (struct sctphdr *)((caddr_t)ip + off); 6151 tag = htonl(sh->v_tag); 6152 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6153 m->m_pkthdr.flowid = flowid; 6154 m->m_flags |= M_FLOWID; 6155 } 6156 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6157 sctp_queue_to_mcore(m, off, cpu_to_use); 6158 return; 6159 } 6160 #endif 6161 sctp_input_with_port(m, off, 0); 6162 } 6163 6164 #endif
Cache object: 0a3705f4c7b028cba9a2ea8943e23a4f
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