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("$FreeBSD$"); 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 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91 { 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207 outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211 } 212 213 /* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217 int 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221 #endif 222 ) 223 { 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280 } 281 282 static int 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284 { 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322 #ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325 #endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 outs->state = SCTP_STREAM_CLOSED; 361 } 362 } 363 /* cut back the count */ 364 asoc->pre_open_streams = newcnt; 365 } 366 SCTP_TCB_SEND_UNLOCK(stcb); 367 asoc->streamoutcnt = asoc->pre_open_streams; 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 372 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 374 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 375 } 376 /* This is the next one we expect */ 377 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 378 379 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 380 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 381 382 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 383 /* open the requested streams */ 384 385 if (asoc->strmin != NULL) { 386 /* Free the old ones */ 387 struct sctp_queued_to_read *ctl, *nctl; 388 389 for (i = 0; i < asoc->streamincnt; i++) { 390 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 391 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 392 sctp_free_remote_addr(ctl->whoFrom); 393 ctl->whoFrom = NULL; 394 sctp_m_freem(ctl->data); 395 ctl->data = NULL; 396 sctp_free_a_readq(stcb, ctl); 397 } 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].stream_no = i; 415 asoc->strmin[i].last_sequence_delivered = 0xffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430 } 431 432 /* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435 static int 436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442 { 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag; 446 uint32_t initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 452 op_err = sctp_arethere_unrecognized_parameters(m, 453 (offset + sizeof(struct sctp_init_chunk)), 454 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 455 if (abort_flag) { 456 /* Send an abort and notify peer */ 457 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 458 *abort_no_unlock = 1; 459 return (-1); 460 } 461 asoc = &stcb->asoc; 462 asoc->peer_supports_nat = (uint8_t) nat_friendly; 463 /* process the peer's parameters in the INIT-ACK */ 464 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 465 if (retval < 0) { 466 return (retval); 467 } 468 initack_limit = offset + ntohs(cp->ch.chunk_length); 469 /* load all addresses */ 470 if ((retval = sctp_load_addresses_from_init(stcb, m, 471 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 472 src, dst, NULL))) { 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 495 stcb->asoc.local_hmacs); 496 if (op_err) { 497 sctp_queue_op_err(stcb, op_err); 498 /* queuing will steal away the mbuf chain to the out queue */ 499 op_err = NULL; 500 } 501 /* extract the cookie and queue it to "echo" it back... */ 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 503 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 504 stcb->asoc.overall_error_count, 505 0, 506 SCTP_FROM_SCTP_INPUT, 507 __LINE__); 508 } 509 stcb->asoc.overall_error_count = 0; 510 net->error_count = 0; 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assue that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 523 SCTP_RTT_FROM_NON_DATA); 524 525 retval = sctp_send_cookie_echo(m, offset, stcb, net); 526 if (retval < 0) { 527 /* 528 * No cookie, we probably should send a op error. But in any 529 * case if there is no cookie in the INIT-ACK, we can 530 * abandon the peer, its broke. 531 */ 532 if (retval == -3) { 533 /* We abort with an error of missing mandatory param */ 534 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 535 if (op_err) { 536 /* 537 * Expand beyond to include the mandatory 538 * param cookie 539 */ 540 struct sctp_inv_mandatory_param *mp; 541 542 SCTP_BUF_LEN(op_err) = 543 sizeof(struct sctp_inv_mandatory_param); 544 mp = mtod(op_err, 545 struct sctp_inv_mandatory_param *); 546 /* Subtract the reserved param */ 547 mp->length = 548 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 549 mp->num_param = htonl(1); 550 mp->param = htons(SCTP_STATE_COOKIE); 551 mp->resv = 0; 552 } 553 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 554 src, dst, sh, op_err, 555 mflowtype, mflowid, 556 vrf_id, net->port); 557 *abort_no_unlock = 1; 558 } 559 return (retval); 560 } 561 return (0); 562 } 563 564 static void 565 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 566 struct sctp_tcb *stcb, struct sctp_nets *net) 567 { 568 union sctp_sockstore store; 569 struct sctp_nets *r_net, *f_net; 570 struct timeval tv; 571 int req_prim = 0; 572 uint16_t old_error_counter; 573 574 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 575 /* Invalid length */ 576 return; 577 } 578 memset(&store, 0, sizeof(store)); 579 switch (cp->heartbeat.hb_info.addr_family) { 580 #ifdef INET 581 case AF_INET: 582 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 583 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 584 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 585 store.sin.sin_port = stcb->rport; 586 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 587 sizeof(store.sin.sin_addr)); 588 } else { 589 return; 590 } 591 break; 592 #endif 593 #ifdef INET6 594 case AF_INET6: 595 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 596 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 597 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 598 store.sin6.sin6_port = stcb->rport; 599 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 600 } else { 601 return; 602 } 603 break; 604 #endif 605 default: 606 return; 607 } 608 r_net = sctp_findnet(stcb, &store.sa); 609 if (r_net == NULL) { 610 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 611 return; 612 } 613 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 614 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 615 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 616 /* 617 * If the its a HB and it's random value is correct when can 618 * confirm the destination. 619 */ 620 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 621 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 622 stcb->asoc.primary_destination = r_net; 623 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 624 f_net = TAILQ_FIRST(&stcb->asoc.nets); 625 if (f_net != r_net) { 626 /* 627 * first one on the list is NOT the primary 628 * sctp_cmpaddr() is much more efficent if 629 * the primary is the first on the list, 630 * make it so. 631 */ 632 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 633 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 634 } 635 req_prim = 1; 636 } 637 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 638 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 639 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 640 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 642 } 643 old_error_counter = r_net->error_count; 644 r_net->error_count = 0; 645 r_net->hb_responded = 1; 646 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 647 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 648 /* Now lets do a RTO with this */ 649 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 650 SCTP_RTT_FROM_NON_DATA); 651 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 652 r_net->dest_state |= SCTP_ADDR_REACHABLE; 653 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 654 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 655 } 656 if (r_net->dest_state & SCTP_ADDR_PF) { 657 r_net->dest_state &= ~SCTP_ADDR_PF; 658 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 659 } 660 if (old_error_counter > 0) { 661 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 662 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 663 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 664 } 665 if (r_net == stcb->asoc.primary_destination) { 666 if (stcb->asoc.alternate) { 667 /* release the alternate, primary is good */ 668 sctp_free_remote_addr(stcb->asoc.alternate); 669 stcb->asoc.alternate = NULL; 670 } 671 } 672 /* Mobility adaptation */ 673 if (req_prim) { 674 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 675 SCTP_MOBILITY_BASE) || 676 sctp_is_mobility_feature_on(stcb->sctp_ep, 677 SCTP_MOBILITY_FASTHANDOFF)) && 678 sctp_is_mobility_feature_on(stcb->sctp_ep, 679 SCTP_MOBILITY_PRIM_DELETED)) { 680 681 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 682 stcb->sctp_ep, stcb, NULL, 683 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 684 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_FASTHANDOFF)) { 686 sctp_assoc_immediate_retrans(stcb, 687 stcb->asoc.primary_destination); 688 } 689 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 690 SCTP_MOBILITY_BASE)) { 691 sctp_move_chunks_from_net(stcb, 692 stcb->asoc.deleted_primary); 693 } 694 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 695 stcb->asoc.deleted_primary); 696 } 697 } 698 } 699 700 static int 701 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 702 { 703 /* 704 * return 0 means we want you to proceed with the abort non-zero 705 * means no abort processing 706 */ 707 struct sctpasochead *head; 708 709 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 710 /* generate a new vtag and send init */ 711 LIST_REMOVE(stcb, sctp_asocs); 712 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 713 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 714 /* 715 * put it in the bucket in the vtag hash of assoc's for the 716 * system 717 */ 718 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 719 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 720 return (1); 721 } 722 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 723 /* 724 * treat like a case where the cookie expired i.e.: - dump 725 * current cookie. - generate a new vtag. - resend init. 726 */ 727 /* generate a new vtag and send init */ 728 LIST_REMOVE(stcb, sctp_asocs); 729 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 730 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 731 sctp_stop_all_cookie_timers(stcb); 732 sctp_toss_old_cookies(stcb, &stcb->asoc); 733 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 734 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 735 /* 736 * put it in the bucket in the vtag hash of assoc's for the 737 * system 738 */ 739 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 740 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 741 return (1); 742 } 743 return (0); 744 } 745 746 static int 747 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 748 struct sctp_nets *net) 749 { 750 /* 751 * return 0 means we want you to proceed with the abort non-zero 752 * means no abort processing 753 */ 754 if (stcb->asoc.auth_supported == 0) { 755 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 756 return (0); 757 } 758 sctp_asconf_send_nat_state_update(stcb, net); 759 return (1); 760 } 761 762 763 static void 764 sctp_handle_abort(struct sctp_abort_chunk *abort, 765 struct sctp_tcb *stcb, struct sctp_nets *net) 766 { 767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 768 struct socket *so; 769 770 #endif 771 uint16_t len; 772 uint16_t error; 773 774 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 775 if (stcb == NULL) 776 return; 777 778 len = ntohs(abort->ch.chunk_length); 779 if (len > sizeof(struct sctp_chunkhdr)) { 780 /* 781 * Need to check the cause codes for our two magic nat 782 * aborts which don't kill the assoc necessarily. 783 */ 784 struct sctp_missing_nat_state *natc; 785 786 natc = (struct sctp_missing_nat_state *)(abort + 1); 787 error = ntohs(natc->cause); 788 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 789 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 790 abort->ch.chunk_flags); 791 if (sctp_handle_nat_colliding_state(stcb)) { 792 return; 793 } 794 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 795 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 796 abort->ch.chunk_flags); 797 if (sctp_handle_nat_missing_state(stcb, net)) { 798 return; 799 } 800 } 801 } else { 802 error = 0; 803 } 804 /* stop any receive timers */ 805 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 806 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 807 /* notify user of the abort and clean up... */ 808 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 809 /* free the tcb */ 810 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 811 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 812 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 813 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 814 } 815 #ifdef SCTP_ASOCLOG_OF_TSNS 816 sctp_print_out_track_log(stcb); 817 #endif 818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 819 so = SCTP_INP_SO(stcb->sctp_ep); 820 atomic_add_int(&stcb->asoc.refcnt, 1); 821 SCTP_TCB_UNLOCK(stcb); 822 SCTP_SOCKET_LOCK(so, 1); 823 SCTP_TCB_LOCK(stcb); 824 atomic_subtract_int(&stcb->asoc.refcnt, 1); 825 #endif 826 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 827 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 828 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 830 SCTP_SOCKET_UNLOCK(so, 1); 831 #endif 832 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 833 } 834 835 static void 836 sctp_start_net_timers(struct sctp_tcb *stcb) 837 { 838 uint32_t cnt_hb_sent; 839 struct sctp_nets *net; 840 841 cnt_hb_sent = 0; 842 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 843 /* 844 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 845 * If the dest in unconfirmed send a hb as well if under 846 * max_hb_burst have been sent. 847 */ 848 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 849 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 850 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 851 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 852 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 853 cnt_hb_sent++; 854 } 855 } 856 if (cnt_hb_sent) { 857 sctp_chunk_output(stcb->sctp_ep, stcb, 858 SCTP_OUTPUT_FROM_COOKIE_ACK, 859 SCTP_SO_NOT_LOCKED); 860 } 861 } 862 863 864 static void 865 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 866 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 867 { 868 struct sctp_association *asoc; 869 int some_on_streamwheel; 870 int old_state; 871 872 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 873 struct socket *so; 874 875 #endif 876 877 SCTPDBG(SCTP_DEBUG_INPUT2, 878 "sctp_handle_shutdown: handling SHUTDOWN\n"); 879 if (stcb == NULL) 880 return; 881 asoc = &stcb->asoc; 882 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 883 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 884 return; 885 } 886 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 887 /* Shutdown NOT the expected size */ 888 return; 889 } 890 old_state = SCTP_GET_STATE(asoc); 891 sctp_update_acked(stcb, cp, abort_flag); 892 if (*abort_flag) { 893 return; 894 } 895 if (asoc->control_pdapi) { 896 /* 897 * With a normal shutdown we assume the end of last record. 898 */ 899 SCTP_INP_READ_LOCK(stcb->sctp_ep); 900 asoc->control_pdapi->end_added = 1; 901 asoc->control_pdapi->pdapi_aborted = 1; 902 asoc->control_pdapi = NULL; 903 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 904 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 905 so = SCTP_INP_SO(stcb->sctp_ep); 906 atomic_add_int(&stcb->asoc.refcnt, 1); 907 SCTP_TCB_UNLOCK(stcb); 908 SCTP_SOCKET_LOCK(so, 1); 909 SCTP_TCB_LOCK(stcb); 910 atomic_subtract_int(&stcb->asoc.refcnt, 1); 911 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 912 /* assoc was freed while we were unlocked */ 913 SCTP_SOCKET_UNLOCK(so, 1); 914 return; 915 } 916 #endif 917 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 919 SCTP_SOCKET_UNLOCK(so, 1); 920 #endif 921 } 922 /* goto SHUTDOWN_RECEIVED state to block new requests */ 923 if (stcb->sctp_socket) { 924 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 925 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 926 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 927 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 928 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 929 /* 930 * notify upper layer that peer has initiated a 931 * shutdown 932 */ 933 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 934 935 /* reset time */ 936 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 937 } 938 } 939 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 940 /* 941 * stop the shutdown timer, since we WILL move to 942 * SHUTDOWN-ACK-SENT. 943 */ 944 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 945 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 946 } 947 /* Now is there unsent data on a stream somewhere? */ 948 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 949 950 if (!TAILQ_EMPTY(&asoc->send_queue) || 951 !TAILQ_EMPTY(&asoc->sent_queue) || 952 some_on_streamwheel) { 953 /* By returning we will push more data out */ 954 return; 955 } else { 956 /* no outstanding data to send, so move on... */ 957 /* send SHUTDOWN-ACK */ 958 /* move to SHUTDOWN-ACK-SENT state */ 959 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 960 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 961 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 962 } 963 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 964 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 965 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 966 sctp_stop_timers_for_shutdown(stcb); 967 sctp_send_shutdown_ack(stcb, net); 968 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 969 stcb->sctp_ep, stcb, net); 970 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 971 sctp_send_shutdown_ack(stcb, net); 972 } 973 } 974 } 975 976 static void 977 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 978 struct sctp_tcb *stcb, 979 struct sctp_nets *net) 980 { 981 struct sctp_association *asoc; 982 983 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 984 struct socket *so; 985 986 so = SCTP_INP_SO(stcb->sctp_ep); 987 #endif 988 SCTPDBG(SCTP_DEBUG_INPUT2, 989 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 990 if (stcb == NULL) 991 return; 992 993 asoc = &stcb->asoc; 994 /* process according to association state */ 995 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 996 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 997 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 998 sctp_send_shutdown_complete(stcb, net, 1); 999 SCTP_TCB_UNLOCK(stcb); 1000 return; 1001 } 1002 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1003 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1004 /* unexpected SHUTDOWN-ACK... so ignore... */ 1005 SCTP_TCB_UNLOCK(stcb); 1006 return; 1007 } 1008 if (asoc->control_pdapi) { 1009 /* 1010 * With a normal shutdown we assume the end of last record. 1011 */ 1012 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1013 asoc->control_pdapi->end_added = 1; 1014 asoc->control_pdapi->pdapi_aborted = 1; 1015 asoc->control_pdapi = NULL; 1016 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1017 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1018 atomic_add_int(&stcb->asoc.refcnt, 1); 1019 SCTP_TCB_UNLOCK(stcb); 1020 SCTP_SOCKET_LOCK(so, 1); 1021 SCTP_TCB_LOCK(stcb); 1022 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1023 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1024 /* assoc was freed while we were unlocked */ 1025 SCTP_SOCKET_UNLOCK(so, 1); 1026 return; 1027 } 1028 #endif 1029 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1031 SCTP_SOCKET_UNLOCK(so, 1); 1032 #endif 1033 } 1034 #ifdef INVARIANTS 1035 if (!TAILQ_EMPTY(&asoc->send_queue) || 1036 !TAILQ_EMPTY(&asoc->sent_queue) || 1037 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1038 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1039 } 1040 #endif 1041 /* stop the timer */ 1042 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1043 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1044 /* send SHUTDOWN-COMPLETE */ 1045 sctp_send_shutdown_complete(stcb, net, 0); 1046 /* notify upper layer protocol */ 1047 if (stcb->sctp_socket) { 1048 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1049 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1050 stcb->sctp_socket->so_snd.sb_cc = 0; 1051 } 1052 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1053 } 1054 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1055 /* free the TCB but first save off the ep */ 1056 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1057 atomic_add_int(&stcb->asoc.refcnt, 1); 1058 SCTP_TCB_UNLOCK(stcb); 1059 SCTP_SOCKET_LOCK(so, 1); 1060 SCTP_TCB_LOCK(stcb); 1061 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1062 #endif 1063 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1064 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1065 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1066 SCTP_SOCKET_UNLOCK(so, 1); 1067 #endif 1068 } 1069 1070 /* 1071 * Skip past the param header and then we will find the chunk that caused the 1072 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1073 * our peer must be broken. 1074 */ 1075 static void 1076 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1077 struct sctp_nets *net) 1078 { 1079 struct sctp_chunkhdr *chk; 1080 1081 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1082 switch (chk->chunk_type) { 1083 case SCTP_ASCONF_ACK: 1084 case SCTP_ASCONF: 1085 sctp_asconf_cleanup(stcb, net); 1086 break; 1087 case SCTP_FORWARD_CUM_TSN: 1088 stcb->asoc.prsctp_supported = 0; 1089 break; 1090 default: 1091 SCTPDBG(SCTP_DEBUG_INPUT2, 1092 "Peer does not support chunk type %d(%x)??\n", 1093 chk->chunk_type, (uint32_t) chk->chunk_type); 1094 break; 1095 } 1096 } 1097 1098 /* 1099 * Skip past the param header and then we will find the param that caused the 1100 * problem. There are a number of param's in a ASCONF OR the prsctp param 1101 * these will turn of specific features. 1102 * XXX: Is this the right thing to do? 1103 */ 1104 static void 1105 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1106 { 1107 struct sctp_paramhdr *pbad; 1108 1109 pbad = phdr + 1; 1110 switch (ntohs(pbad->param_type)) { 1111 /* pr-sctp draft */ 1112 case SCTP_PRSCTP_SUPPORTED: 1113 stcb->asoc.prsctp_supported = 0; 1114 break; 1115 case SCTP_SUPPORTED_CHUNK_EXT: 1116 break; 1117 /* draft-ietf-tsvwg-addip-sctp */ 1118 case SCTP_HAS_NAT_SUPPORT: 1119 stcb->asoc.peer_supports_nat = 0; 1120 break; 1121 case SCTP_ADD_IP_ADDRESS: 1122 case SCTP_DEL_IP_ADDRESS: 1123 case SCTP_SET_PRIM_ADDR: 1124 stcb->asoc.asconf_supported = 0; 1125 break; 1126 case SCTP_SUCCESS_REPORT: 1127 case SCTP_ERROR_CAUSE_IND: 1128 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1129 SCTPDBG(SCTP_DEBUG_INPUT2, 1130 "Turning off ASCONF to this strange peer\n"); 1131 stcb->asoc.asconf_supported = 0; 1132 break; 1133 default: 1134 SCTPDBG(SCTP_DEBUG_INPUT2, 1135 "Peer does not support param type %d(%x)??\n", 1136 pbad->param_type, (uint32_t) pbad->param_type); 1137 break; 1138 } 1139 } 1140 1141 static int 1142 sctp_handle_error(struct sctp_chunkhdr *ch, 1143 struct sctp_tcb *stcb, struct sctp_nets *net) 1144 { 1145 int chklen; 1146 struct sctp_paramhdr *phdr; 1147 uint16_t error, error_type; 1148 uint16_t error_len; 1149 struct sctp_association *asoc; 1150 int adjust; 1151 1152 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1153 struct socket *so; 1154 1155 #endif 1156 1157 /* parse through all of the errors and process */ 1158 asoc = &stcb->asoc; 1159 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1160 sizeof(struct sctp_chunkhdr)); 1161 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1162 error = 0; 1163 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1164 /* Process an Error Cause */ 1165 error_type = ntohs(phdr->param_type); 1166 error_len = ntohs(phdr->param_length); 1167 if ((error_len > chklen) || (error_len == 0)) { 1168 /* invalid param length for this param */ 1169 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1170 chklen, error_len); 1171 return (0); 1172 } 1173 if (error == 0) { 1174 /* report the first error cause */ 1175 error = error_type; 1176 } 1177 switch (error_type) { 1178 case SCTP_CAUSE_INVALID_STREAM: 1179 case SCTP_CAUSE_MISSING_PARAM: 1180 case SCTP_CAUSE_INVALID_PARAM: 1181 case SCTP_CAUSE_NO_USER_DATA: 1182 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1183 error_type); 1184 break; 1185 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1186 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1187 ch->chunk_flags); 1188 if (sctp_handle_nat_colliding_state(stcb)) { 1189 return (0); 1190 } 1191 break; 1192 case SCTP_CAUSE_NAT_MISSING_STATE: 1193 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1194 ch->chunk_flags); 1195 if (sctp_handle_nat_missing_state(stcb, net)) { 1196 return (0); 1197 } 1198 break; 1199 case SCTP_CAUSE_STALE_COOKIE: 1200 /* 1201 * We only act if we have echoed a cookie and are 1202 * waiting. 1203 */ 1204 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1205 int *p; 1206 1207 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1208 /* Save the time doubled */ 1209 asoc->cookie_preserve_req = ntohl(*p) << 1; 1210 asoc->stale_cookie_count++; 1211 if (asoc->stale_cookie_count > 1212 asoc->max_init_times) { 1213 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1214 /* now free the asoc */ 1215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1216 so = SCTP_INP_SO(stcb->sctp_ep); 1217 atomic_add_int(&stcb->asoc.refcnt, 1); 1218 SCTP_TCB_UNLOCK(stcb); 1219 SCTP_SOCKET_LOCK(so, 1); 1220 SCTP_TCB_LOCK(stcb); 1221 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1222 #endif 1223 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1224 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1226 SCTP_SOCKET_UNLOCK(so, 1); 1227 #endif 1228 return (-1); 1229 } 1230 /* blast back to INIT state */ 1231 sctp_toss_old_cookies(stcb, &stcb->asoc); 1232 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1233 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1234 sctp_stop_all_cookie_timers(stcb); 1235 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1236 } 1237 break; 1238 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1239 /* 1240 * Nothing we can do here, we don't do hostname 1241 * addresses so if the peer does not like my IPv6 1242 * (or IPv4 for that matter) it does not matter. If 1243 * they don't support that type of address, they can 1244 * NOT possibly get that packet type... i.e. with no 1245 * IPv6 you can't recieve a IPv6 packet. so we can 1246 * safely ignore this one. If we ever added support 1247 * for HOSTNAME Addresses, then we would need to do 1248 * something here. 1249 */ 1250 break; 1251 case SCTP_CAUSE_UNRECOG_CHUNK: 1252 sctp_process_unrecog_chunk(stcb, phdr, net); 1253 break; 1254 case SCTP_CAUSE_UNRECOG_PARAM: 1255 sctp_process_unrecog_param(stcb, phdr); 1256 break; 1257 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1258 /* 1259 * We ignore this since the timer will drive out a 1260 * new cookie anyway and there timer will drive us 1261 * to send a SHUTDOWN_COMPLETE. We can't send one 1262 * here since we don't have their tag. 1263 */ 1264 break; 1265 case SCTP_CAUSE_DELETING_LAST_ADDR: 1266 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1267 case SCTP_CAUSE_DELETING_SRC_ADDR: 1268 /* 1269 * We should NOT get these here, but in a 1270 * ASCONF-ACK. 1271 */ 1272 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1273 error_type); 1274 break; 1275 case SCTP_CAUSE_OUT_OF_RESC: 1276 /* 1277 * And what, pray tell do we do with the fact that 1278 * the peer is out of resources? Not really sure we 1279 * could do anything but abort. I suspect this 1280 * should have came WITH an abort instead of in a 1281 * OP-ERROR. 1282 */ 1283 break; 1284 default: 1285 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1286 error_type); 1287 break; 1288 } 1289 adjust = SCTP_SIZE32(error_len); 1290 chklen -= adjust; 1291 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1292 } 1293 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1294 return (0); 1295 } 1296 1297 static int 1298 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1299 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1300 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1301 struct sctp_nets *net, int *abort_no_unlock, 1302 uint8_t mflowtype, uint32_t mflowid, 1303 uint32_t vrf_id) 1304 { 1305 struct sctp_init_ack *init_ack; 1306 struct mbuf *op_err; 1307 1308 SCTPDBG(SCTP_DEBUG_INPUT2, 1309 "sctp_handle_init_ack: handling INIT-ACK\n"); 1310 1311 if (stcb == NULL) { 1312 SCTPDBG(SCTP_DEBUG_INPUT2, 1313 "sctp_handle_init_ack: TCB is null\n"); 1314 return (-1); 1315 } 1316 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1317 /* Invalid length */ 1318 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1319 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1320 src, dst, sh, op_err, 1321 mflowtype, mflowid, 1322 vrf_id, net->port); 1323 *abort_no_unlock = 1; 1324 return (-1); 1325 } 1326 init_ack = &cp->init; 1327 /* validate parameters */ 1328 if (init_ack->initiate_tag == 0) { 1329 /* protocol error... send an abort */ 1330 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1331 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1332 src, dst, sh, op_err, 1333 mflowtype, mflowid, 1334 vrf_id, net->port); 1335 *abort_no_unlock = 1; 1336 return (-1); 1337 } 1338 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1339 /* protocol error... send an abort */ 1340 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1341 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1342 src, dst, sh, op_err, 1343 mflowtype, mflowid, 1344 vrf_id, net->port); 1345 *abort_no_unlock = 1; 1346 return (-1); 1347 } 1348 if (init_ack->num_inbound_streams == 0) { 1349 /* protocol error... send an abort */ 1350 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1351 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1352 src, dst, sh, op_err, 1353 mflowtype, mflowid, 1354 vrf_id, net->port); 1355 *abort_no_unlock = 1; 1356 return (-1); 1357 } 1358 if (init_ack->num_outbound_streams == 0) { 1359 /* protocol error... send an abort */ 1360 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1361 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1362 src, dst, sh, op_err, 1363 mflowtype, mflowid, 1364 vrf_id, net->port); 1365 *abort_no_unlock = 1; 1366 return (-1); 1367 } 1368 /* process according to association state... */ 1369 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1370 case SCTP_STATE_COOKIE_WAIT: 1371 /* this is the expected state for this chunk */ 1372 /* process the INIT-ACK parameters */ 1373 if (stcb->asoc.primary_destination->dest_state & 1374 SCTP_ADDR_UNCONFIRMED) { 1375 /* 1376 * The primary is where we sent the INIT, we can 1377 * always consider it confirmed when the INIT-ACK is 1378 * returned. Do this before we load addresses 1379 * though. 1380 */ 1381 stcb->asoc.primary_destination->dest_state &= 1382 ~SCTP_ADDR_UNCONFIRMED; 1383 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1384 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1385 } 1386 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1387 net, abort_no_unlock, 1388 mflowtype, mflowid, 1389 vrf_id) < 0) { 1390 /* error in parsing parameters */ 1391 return (-1); 1392 } 1393 /* update our state */ 1394 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1395 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1396 1397 /* reset the RTO calc */ 1398 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1399 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1400 stcb->asoc.overall_error_count, 1401 0, 1402 SCTP_FROM_SCTP_INPUT, 1403 __LINE__); 1404 } 1405 stcb->asoc.overall_error_count = 0; 1406 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1407 /* 1408 * collapse the init timer back in case of a exponential 1409 * backoff 1410 */ 1411 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1412 stcb, net); 1413 /* 1414 * the send at the end of the inbound data processing will 1415 * cause the cookie to be sent 1416 */ 1417 break; 1418 case SCTP_STATE_SHUTDOWN_SENT: 1419 /* incorrect state... discard */ 1420 break; 1421 case SCTP_STATE_COOKIE_ECHOED: 1422 /* incorrect state... discard */ 1423 break; 1424 case SCTP_STATE_OPEN: 1425 /* incorrect state... discard */ 1426 break; 1427 case SCTP_STATE_EMPTY: 1428 case SCTP_STATE_INUSE: 1429 default: 1430 /* incorrect state... discard */ 1431 return (-1); 1432 break; 1433 } 1434 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1435 return (0); 1436 } 1437 1438 static struct sctp_tcb * 1439 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1440 struct sockaddr *src, struct sockaddr *dst, 1441 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1442 struct sctp_inpcb *inp, struct sctp_nets **netp, 1443 struct sockaddr *init_src, int *notification, 1444 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1445 uint8_t mflowtype, uint32_t mflowid, 1446 uint32_t vrf_id, uint16_t port); 1447 1448 1449 /* 1450 * handle a state cookie for an existing association m: input packet mbuf 1451 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1452 * "split" mbuf and the cookie signature does not exist offset: offset into 1453 * mbuf to the cookie-echo chunk 1454 */ 1455 static struct sctp_tcb * 1456 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1457 struct sockaddr *src, struct sockaddr *dst, 1458 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1459 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1460 struct sockaddr *init_src, int *notification, 1461 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1462 uint8_t mflowtype, uint32_t mflowid, 1463 uint32_t vrf_id, uint16_t port) 1464 { 1465 struct sctp_association *asoc; 1466 struct sctp_init_chunk *init_cp, init_buf; 1467 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1468 struct sctp_nets *net; 1469 struct mbuf *op_err; 1470 int init_offset, initack_offset, i; 1471 int retval; 1472 int spec_flag = 0; 1473 uint32_t how_indx; 1474 1475 #if defined(SCTP_DETAILED_STR_STATS) 1476 int j; 1477 1478 #endif 1479 1480 net = *netp; 1481 /* I know that the TCB is non-NULL from the caller */ 1482 asoc = &stcb->asoc; 1483 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1484 if (asoc->cookie_how[how_indx] == 0) 1485 break; 1486 } 1487 if (how_indx < sizeof(asoc->cookie_how)) { 1488 asoc->cookie_how[how_indx] = 1; 1489 } 1490 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1491 /* SHUTDOWN came in after sending INIT-ACK */ 1492 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1493 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1494 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1495 mflowtype, mflowid, inp->fibnum, 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(asoc)) { 1560 case SCTP_STATE_COOKIE_WAIT: 1561 case SCTP_STATE_COOKIE_ECHOED: 1562 /* 1563 * INIT was sent but got a COOKIE_ECHO with the 1564 * correct tags... just accept it...but we must 1565 * process the init so that we can make sure we have 1566 * the right seq no's. 1567 */ 1568 /* First we must process the INIT !! */ 1569 retval = sctp_process_init(init_cp, stcb); 1570 if (retval < 0) { 1571 if (how_indx < sizeof(asoc->cookie_how)) 1572 asoc->cookie_how[how_indx] = 3; 1573 return (NULL); 1574 } 1575 /* we have already processed the INIT so no problem */ 1576 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1577 stcb, net, 1578 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1579 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1580 stcb, net, 1581 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1582 /* update current state */ 1583 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1584 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1585 else 1586 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1587 1588 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1589 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1590 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1591 stcb->sctp_ep, stcb, asoc->primary_destination); 1592 } 1593 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1594 sctp_stop_all_cookie_timers(stcb); 1595 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1596 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1597 (inp->sctp_socket->so_qlimit == 0) 1598 ) { 1599 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1600 struct socket *so; 1601 1602 #endif 1603 /* 1604 * Here is where collision would go if we 1605 * did a connect() and instead got a 1606 * init/init-ack/cookie done before the 1607 * init-ack came back.. 1608 */ 1609 stcb->sctp_ep->sctp_flags |= 1610 SCTP_PCB_FLAGS_CONNECTED; 1611 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1612 so = SCTP_INP_SO(stcb->sctp_ep); 1613 atomic_add_int(&stcb->asoc.refcnt, 1); 1614 SCTP_TCB_UNLOCK(stcb); 1615 SCTP_SOCKET_LOCK(so, 1); 1616 SCTP_TCB_LOCK(stcb); 1617 atomic_add_int(&stcb->asoc.refcnt, -1); 1618 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1619 SCTP_SOCKET_UNLOCK(so, 1); 1620 return (NULL); 1621 } 1622 #endif 1623 soisconnected(stcb->sctp_socket); 1624 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1625 SCTP_SOCKET_UNLOCK(so, 1); 1626 #endif 1627 } 1628 /* notify upper layer */ 1629 *notification = SCTP_NOTIFY_ASSOC_UP; 1630 /* 1631 * since we did not send a HB make sure we don't 1632 * double things 1633 */ 1634 net->hb_responded = 1; 1635 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1636 &cookie->time_entered, 1637 sctp_align_unsafe_makecopy, 1638 SCTP_RTT_FROM_NON_DATA); 1639 1640 if (stcb->asoc.sctp_autoclose_ticks && 1641 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1642 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1643 inp, stcb, NULL); 1644 } 1645 break; 1646 default: 1647 /* 1648 * we're in the OPEN state (or beyond), so peer must 1649 * have simply lost the COOKIE-ACK 1650 */ 1651 break; 1652 } /* end switch */ 1653 sctp_stop_all_cookie_timers(stcb); 1654 /* 1655 * We ignore the return code here.. not sure if we should 1656 * somehow abort.. but we do have an existing asoc. This 1657 * really should not fail. 1658 */ 1659 if (sctp_load_addresses_from_init(stcb, m, 1660 init_offset + sizeof(struct sctp_init_chunk), 1661 initack_offset, src, dst, init_src)) { 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 4; 1664 return (NULL); 1665 } 1666 /* respond with a COOKIE-ACK */ 1667 sctp_toss_old_cookies(stcb, asoc); 1668 sctp_send_cookie_ack(stcb); 1669 if (how_indx < sizeof(asoc->cookie_how)) 1670 asoc->cookie_how[how_indx] = 5; 1671 return (stcb); 1672 } 1673 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1674 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1675 cookie->tie_tag_my_vtag == 0 && 1676 cookie->tie_tag_peer_vtag == 0) { 1677 /* 1678 * case C in Section 5.2.4 Table 2: XMOO silently discard 1679 */ 1680 if (how_indx < sizeof(asoc->cookie_how)) 1681 asoc->cookie_how[how_indx] = 6; 1682 return (NULL); 1683 } 1684 /* 1685 * If nat support, and the below and stcb is established, send back 1686 * a ABORT(colliding state) if we are established. 1687 */ 1688 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1689 (asoc->peer_supports_nat) && 1690 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1691 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1692 (asoc->peer_vtag == 0)))) { 1693 /* 1694 * Special case - Peer's support nat. We may have two init's 1695 * that we gave out the same tag on since one was not 1696 * established.. i.e. we get INIT from host-1 behind the nat 1697 * and we respond tag-a, we get a INIT from host-2 behind 1698 * the nat and we get tag-a again. Then we bring up host-1 1699 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1700 * Now we have colliding state. We must send an abort here 1701 * with colliding state indication. 1702 */ 1703 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1704 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1705 mflowtype, mflowid, inp->fibnum, 1706 vrf_id, port); 1707 return (NULL); 1708 } 1709 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1710 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1711 (asoc->peer_vtag == 0))) { 1712 /* 1713 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1714 * should be ok, re-accept peer info 1715 */ 1716 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1717 /* 1718 * Extension of case C. If we hit this, then the 1719 * random number generator returned the same vtag 1720 * when we first sent our INIT-ACK and when we later 1721 * sent our INIT. The side with the seq numbers that 1722 * are different will be the one that normnally 1723 * would have hit case C. This in effect "extends" 1724 * our vtags in this collision case to be 64 bits. 1725 * The same collision could occur aka you get both 1726 * vtag and seq number the same twice in a row.. but 1727 * is much less likely. If it did happen then we 1728 * would proceed through and bring up the assoc.. we 1729 * may end up with the wrong stream setup however.. 1730 * which would be bad.. but there is no way to 1731 * tell.. until we send on a stream that does not 1732 * exist :-) 1733 */ 1734 if (how_indx < sizeof(asoc->cookie_how)) 1735 asoc->cookie_how[how_indx] = 7; 1736 1737 return (NULL); 1738 } 1739 if (how_indx < sizeof(asoc->cookie_how)) 1740 asoc->cookie_how[how_indx] = 8; 1741 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1742 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1743 sctp_stop_all_cookie_timers(stcb); 1744 /* 1745 * since we did not send a HB make sure we don't double 1746 * things 1747 */ 1748 net->hb_responded = 1; 1749 if (stcb->asoc.sctp_autoclose_ticks && 1750 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1751 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1752 NULL); 1753 } 1754 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1755 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1756 1757 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1758 /* 1759 * Ok the peer probably discarded our data (if we 1760 * echoed a cookie+data). So anything on the 1761 * sent_queue should be marked for retransmit, we 1762 * may not get something to kick us so it COULD 1763 * still take a timeout to move these.. but it can't 1764 * hurt to mark them. 1765 */ 1766 struct sctp_tmit_chunk *chk; 1767 1768 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1769 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1770 chk->sent = SCTP_DATAGRAM_RESEND; 1771 sctp_flight_size_decrease(chk); 1772 sctp_total_flight_decrease(stcb, chk); 1773 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1774 spec_flag++; 1775 } 1776 } 1777 1778 } 1779 /* process the INIT info (peer's info) */ 1780 retval = sctp_process_init(init_cp, stcb); 1781 if (retval < 0) { 1782 if (how_indx < sizeof(asoc->cookie_how)) 1783 asoc->cookie_how[how_indx] = 9; 1784 return (NULL); 1785 } 1786 if (sctp_load_addresses_from_init(stcb, m, 1787 init_offset + sizeof(struct sctp_init_chunk), 1788 initack_offset, src, dst, init_src)) { 1789 if (how_indx < sizeof(asoc->cookie_how)) 1790 asoc->cookie_how[how_indx] = 10; 1791 return (NULL); 1792 } 1793 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1794 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1795 *notification = SCTP_NOTIFY_ASSOC_UP; 1796 1797 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1798 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1799 (inp->sctp_socket->so_qlimit == 0)) { 1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1801 struct socket *so; 1802 1803 #endif 1804 stcb->sctp_ep->sctp_flags |= 1805 SCTP_PCB_FLAGS_CONNECTED; 1806 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1807 so = SCTP_INP_SO(stcb->sctp_ep); 1808 atomic_add_int(&stcb->asoc.refcnt, 1); 1809 SCTP_TCB_UNLOCK(stcb); 1810 SCTP_SOCKET_LOCK(so, 1); 1811 SCTP_TCB_LOCK(stcb); 1812 atomic_add_int(&stcb->asoc.refcnt, -1); 1813 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1814 SCTP_SOCKET_UNLOCK(so, 1); 1815 return (NULL); 1816 } 1817 #endif 1818 soisconnected(stcb->sctp_socket); 1819 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1820 SCTP_SOCKET_UNLOCK(so, 1); 1821 #endif 1822 } 1823 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1824 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1825 else 1826 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1827 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1828 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1829 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1830 } else { 1831 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1832 } 1833 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1834 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1835 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1836 stcb->sctp_ep, stcb, asoc->primary_destination); 1837 } 1838 sctp_stop_all_cookie_timers(stcb); 1839 sctp_toss_old_cookies(stcb, asoc); 1840 sctp_send_cookie_ack(stcb); 1841 if (spec_flag) { 1842 /* 1843 * only if we have retrans set do we do this. What 1844 * this call does is get only the COOKIE-ACK out and 1845 * then when we return the normal call to 1846 * sctp_chunk_output will get the retrans out behind 1847 * this. 1848 */ 1849 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1850 } 1851 if (how_indx < sizeof(asoc->cookie_how)) 1852 asoc->cookie_how[how_indx] = 11; 1853 1854 return (stcb); 1855 } 1856 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1857 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1858 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1859 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1860 cookie->tie_tag_peer_vtag != 0) { 1861 struct sctpasochead *head; 1862 1863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1864 struct socket *so; 1865 1866 #endif 1867 1868 if (asoc->peer_supports_nat) { 1869 /* 1870 * This is a gross gross hack. Just call the 1871 * cookie_new code since we are allowing a duplicate 1872 * association. I hope this works... 1873 */ 1874 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1875 sh, cookie, cookie_len, 1876 inp, netp, init_src, notification, 1877 auth_skipped, auth_offset, auth_len, 1878 mflowtype, mflowid, 1879 vrf_id, port)); 1880 } 1881 /* 1882 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1883 */ 1884 /* temp code */ 1885 if (how_indx < sizeof(asoc->cookie_how)) 1886 asoc->cookie_how[how_indx] = 12; 1887 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1888 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1889 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1890 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1891 1892 /* notify upper layer */ 1893 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1894 atomic_add_int(&stcb->asoc.refcnt, 1); 1895 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1896 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1897 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1898 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1899 } 1900 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1901 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1902 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1903 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1904 } 1905 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1906 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1907 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1908 stcb->sctp_ep, stcb, asoc->primary_destination); 1909 1910 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1911 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1912 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1913 } 1914 asoc->pre_open_streams = 1915 ntohs(initack_cp->init.num_outbound_streams); 1916 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1917 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1918 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1919 1920 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1921 1922 asoc->str_reset_seq_in = asoc->init_seq_number; 1923 1924 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1925 if (asoc->mapping_array) { 1926 memset(asoc->mapping_array, 0, 1927 asoc->mapping_array_size); 1928 } 1929 if (asoc->nr_mapping_array) { 1930 memset(asoc->nr_mapping_array, 0, 1931 asoc->mapping_array_size); 1932 } 1933 SCTP_TCB_UNLOCK(stcb); 1934 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1935 so = SCTP_INP_SO(stcb->sctp_ep); 1936 SCTP_SOCKET_LOCK(so, 1); 1937 #endif 1938 SCTP_INP_INFO_WLOCK(); 1939 SCTP_INP_WLOCK(stcb->sctp_ep); 1940 SCTP_TCB_LOCK(stcb); 1941 atomic_add_int(&stcb->asoc.refcnt, -1); 1942 /* send up all the data */ 1943 SCTP_TCB_SEND_LOCK(stcb); 1944 1945 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1946 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1947 stcb->asoc.strmout[i].chunks_on_queues = 0; 1948 #if defined(SCTP_DETAILED_STR_STATS) 1949 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1950 asoc->strmout[i].abandoned_sent[j] = 0; 1951 asoc->strmout[i].abandoned_unsent[j] = 0; 1952 } 1953 #else 1954 asoc->strmout[i].abandoned_sent[0] = 0; 1955 asoc->strmout[i].abandoned_unsent[0] = 0; 1956 #endif 1957 stcb->asoc.strmout[i].stream_no = i; 1958 stcb->asoc.strmout[i].next_sequence_send = 0; 1959 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1960 } 1961 /* process the INIT-ACK info (my info) */ 1962 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1963 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1964 1965 /* pull from vtag hash */ 1966 LIST_REMOVE(stcb, sctp_asocs); 1967 /* re-insert to new vtag position */ 1968 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1969 SCTP_BASE_INFO(hashasocmark))]; 1970 /* 1971 * put it in the bucket in the vtag hash of assoc's for the 1972 * system 1973 */ 1974 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1975 1976 SCTP_TCB_SEND_UNLOCK(stcb); 1977 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1978 SCTP_INP_INFO_WUNLOCK(); 1979 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1980 SCTP_SOCKET_UNLOCK(so, 1); 1981 #endif 1982 asoc->total_flight = 0; 1983 asoc->total_flight_count = 0; 1984 /* process the INIT info (peer's info) */ 1985 retval = sctp_process_init(init_cp, stcb); 1986 if (retval < 0) { 1987 if (how_indx < sizeof(asoc->cookie_how)) 1988 asoc->cookie_how[how_indx] = 13; 1989 1990 return (NULL); 1991 } 1992 /* 1993 * since we did not send a HB make sure we don't double 1994 * things 1995 */ 1996 net->hb_responded = 1; 1997 1998 if (sctp_load_addresses_from_init(stcb, m, 1999 init_offset + sizeof(struct sctp_init_chunk), 2000 initack_offset, src, dst, init_src)) { 2001 if (how_indx < sizeof(asoc->cookie_how)) 2002 asoc->cookie_how[how_indx] = 14; 2003 2004 return (NULL); 2005 } 2006 /* respond with a COOKIE-ACK */ 2007 sctp_stop_all_cookie_timers(stcb); 2008 sctp_toss_old_cookies(stcb, asoc); 2009 sctp_send_cookie_ack(stcb); 2010 if (how_indx < sizeof(asoc->cookie_how)) 2011 asoc->cookie_how[how_indx] = 15; 2012 2013 return (stcb); 2014 } 2015 if (how_indx < sizeof(asoc->cookie_how)) 2016 asoc->cookie_how[how_indx] = 16; 2017 /* all other cases... */ 2018 return (NULL); 2019 } 2020 2021 2022 /* 2023 * handle a state cookie for a new association m: input packet mbuf chain-- 2024 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2025 * and the cookie signature does not exist offset: offset into mbuf to the 2026 * cookie-echo chunk length: length of the cookie chunk to: where the init 2027 * was from returns a new TCB 2028 */ 2029 static struct sctp_tcb * 2030 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2031 struct sockaddr *src, struct sockaddr *dst, 2032 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2033 struct sctp_inpcb *inp, struct sctp_nets **netp, 2034 struct sockaddr *init_src, int *notification, 2035 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2036 uint8_t mflowtype, uint32_t mflowid, 2037 uint32_t vrf_id, uint16_t port) 2038 { 2039 struct sctp_tcb *stcb; 2040 struct sctp_init_chunk *init_cp, init_buf; 2041 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2042 union sctp_sockstore store; 2043 struct sctp_association *asoc; 2044 int init_offset, initack_offset, initack_limit; 2045 int retval; 2046 int error = 0; 2047 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2048 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_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2120 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2121 src, dst, sh, op_err, 2122 mflowtype, mflowid, 2123 vrf_id, port); 2124 return (NULL); 2125 } 2126 /* get the correct sctp_nets */ 2127 if (netp) 2128 *netp = sctp_findnet(stcb, init_src); 2129 2130 asoc = &stcb->asoc; 2131 /* get scope variables out of cookie */ 2132 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2133 asoc->scope.site_scope = cookie->site_scope; 2134 asoc->scope.local_scope = cookie->local_scope; 2135 asoc->scope.loopback_scope = cookie->loopback_scope; 2136 2137 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2138 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2139 struct mbuf *op_err; 2140 2141 /* 2142 * Houston we have a problem. The EP changed while the 2143 * cookie was in flight. Only recourse is to abort the 2144 * association. 2145 */ 2146 atomic_add_int(&stcb->asoc.refcnt, 1); 2147 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2148 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2149 src, dst, sh, op_err, 2150 mflowtype, mflowid, 2151 vrf_id, port); 2152 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_TCB_UNLOCK(stcb); 2154 SCTP_SOCKET_LOCK(so, 1); 2155 SCTP_TCB_LOCK(stcb); 2156 #endif 2157 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2158 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2159 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2160 SCTP_SOCKET_UNLOCK(so, 1); 2161 #endif 2162 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2163 return (NULL); 2164 } 2165 /* process the INIT-ACK info (my info) */ 2166 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2167 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2168 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2169 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2170 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2171 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2172 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2173 asoc->str_reset_seq_in = asoc->init_seq_number; 2174 2175 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2176 2177 /* process the INIT info (peer's info) */ 2178 if (netp) 2179 retval = sctp_process_init(init_cp, stcb); 2180 else 2181 retval = 0; 2182 if (retval < 0) { 2183 atomic_add_int(&stcb->asoc.refcnt, 1); 2184 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2185 SCTP_TCB_UNLOCK(stcb); 2186 SCTP_SOCKET_LOCK(so, 1); 2187 SCTP_TCB_LOCK(stcb); 2188 #endif 2189 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2190 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 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, 2208 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_SOCKET_UNLOCK(so, 1); 2211 #endif 2212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2213 return (NULL); 2214 } 2215 /* 2216 * verify any preceding AUTH chunk that was skipped 2217 */ 2218 /* pull the local authentication parameters from the cookie/init-ack */ 2219 sctp_auth_get_cookie_params(stcb, m, 2220 initack_offset + sizeof(struct sctp_init_ack_chunk), 2221 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2222 if (auth_skipped) { 2223 struct sctp_auth_chunk *auth; 2224 2225 auth = (struct sctp_auth_chunk *) 2226 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2227 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2228 /* auth HMAC failed, dump the assoc and packet */ 2229 SCTPDBG(SCTP_DEBUG_AUTH1, 2230 "COOKIE-ECHO: AUTH failed\n"); 2231 atomic_add_int(&stcb->asoc.refcnt, 1); 2232 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2233 SCTP_TCB_UNLOCK(stcb); 2234 SCTP_SOCKET_LOCK(so, 1); 2235 SCTP_TCB_LOCK(stcb); 2236 #endif 2237 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2240 SCTP_SOCKET_UNLOCK(so, 1); 2241 #endif 2242 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2243 return (NULL); 2244 } else { 2245 /* remaining chunks checked... good to go */ 2246 stcb->asoc.authenticated = 1; 2247 } 2248 } 2249 /* update current state */ 2250 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2251 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2252 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2253 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2254 stcb->sctp_ep, stcb, asoc->primary_destination); 2255 } 2256 sctp_stop_all_cookie_timers(stcb); 2257 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2258 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2259 2260 /* 2261 * if we're doing ASCONFs, check to see if we have any new local 2262 * addresses that need to get added to the peer (eg. addresses 2263 * changed while cookie echo in flight). This needs to be done 2264 * after we go to the OPEN state to do the correct asconf 2265 * processing. else, make sure we have the correct addresses in our 2266 * lists 2267 */ 2268 2269 /* warning, we re-use sin, sin6, sa_store here! */ 2270 /* pull in local_address (our "from" address) */ 2271 switch (cookie->laddr_type) { 2272 #ifdef INET 2273 case SCTP_IPV4_ADDRESS: 2274 /* source addr is IPv4 */ 2275 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2276 store.sin.sin_family = AF_INET; 2277 store.sin.sin_len = sizeof(struct sockaddr_in); 2278 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2279 break; 2280 #endif 2281 #ifdef INET6 2282 case SCTP_IPV6_ADDRESS: 2283 /* source addr is IPv6 */ 2284 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2285 store.sin6.sin6_family = AF_INET6; 2286 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2287 store.sin6.sin6_scope_id = cookie->scope_id; 2288 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2289 break; 2290 #endif 2291 default: 2292 atomic_add_int(&stcb->asoc.refcnt, 1); 2293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2294 SCTP_TCB_UNLOCK(stcb); 2295 SCTP_SOCKET_LOCK(so, 1); 2296 SCTP_TCB_LOCK(stcb); 2297 #endif 2298 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2299 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 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 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2354 if ((netp) && (*netp)) { 2355 /* calculate the RTT and set the encaps port */ 2356 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2357 &cookie->time_entered, sctp_align_unsafe_makecopy, 2358 SCTP_RTT_FROM_NON_DATA); 2359 (*netp)->port = port; 2360 } 2361 /* respond with a COOKIE-ACK */ 2362 sctp_send_cookie_ack(stcb); 2363 2364 /* 2365 * check the address lists for any ASCONFs that need to be sent 2366 * AFTER the cookie-ack is sent 2367 */ 2368 sctp_check_address_list(stcb, m, 2369 initack_offset + sizeof(struct sctp_init_ack_chunk), 2370 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2371 &store.sa, cookie->local_scope, cookie->site_scope, 2372 cookie->ipv4_scope, cookie->loopback_scope); 2373 2374 2375 return (stcb); 2376 } 2377 2378 /* 2379 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2380 * we NEED to make sure we are not already using the vtag. If so we 2381 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2382 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2383 SCTP_BASE_INFO(hashasocmark))]; 2384 LIST_FOREACH(stcb, head, sctp_asocs) { 2385 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2386 -- SEND ABORT - TRY AGAIN -- 2387 } 2388 } 2389 */ 2390 2391 /* 2392 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2393 * existing (non-NULL) TCB 2394 */ 2395 static struct mbuf * 2396 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2397 struct sockaddr *src, struct sockaddr *dst, 2398 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2399 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2400 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2401 struct sctp_tcb **locked_tcb, 2402 uint8_t mflowtype, uint32_t mflowid, 2403 uint32_t vrf_id, uint16_t port) 2404 { 2405 struct sctp_state_cookie *cookie; 2406 struct sctp_tcb *l_stcb = *stcb; 2407 struct sctp_inpcb *l_inp; 2408 struct sockaddr *to; 2409 struct sctp_pcb *ep; 2410 struct mbuf *m_sig; 2411 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2412 uint8_t *sig; 2413 uint8_t cookie_ok = 0; 2414 unsigned int sig_offset, cookie_offset; 2415 unsigned int cookie_len; 2416 struct timeval now; 2417 struct timeval time_expires; 2418 int notification = 0; 2419 struct sctp_nets *netl; 2420 int had_a_existing_tcb = 0; 2421 int send_int_conf = 0; 2422 2423 #ifdef INET 2424 struct sockaddr_in sin; 2425 2426 #endif 2427 #ifdef INET6 2428 struct sockaddr_in6 sin6; 2429 2430 #endif 2431 2432 SCTPDBG(SCTP_DEBUG_INPUT2, 2433 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2434 2435 if (inp_p == NULL) { 2436 return (NULL); 2437 } 2438 cookie = &cp->cookie; 2439 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2440 cookie_len = ntohs(cp->ch.chunk_length); 2441 2442 if ((cookie->peerport != sh->src_port) && 2443 (cookie->myport != sh->dest_port) && 2444 (cookie->my_vtag != sh->v_tag)) { 2445 /* 2446 * invalid ports or bad tag. Note that we always leave the 2447 * v_tag in the header in network order and when we stored 2448 * it in the my_vtag slot we also left it in network order. 2449 * This maintains the match even though it may be in the 2450 * opposite byte order of the machine :-> 2451 */ 2452 return (NULL); 2453 } 2454 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2455 sizeof(struct sctp_init_chunk) + 2456 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2457 /* cookie too small */ 2458 return (NULL); 2459 } 2460 /* 2461 * split off the signature into its own mbuf (since it should not be 2462 * calculated in the sctp_hmac_m() call). 2463 */ 2464 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2465 m_sig = m_split(m, sig_offset, M_NOWAIT); 2466 if (m_sig == NULL) { 2467 /* out of memory or ?? */ 2468 return (NULL); 2469 } 2470 #ifdef SCTP_MBUF_LOGGING 2471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2472 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2473 } 2474 #endif 2475 2476 /* 2477 * compute the signature/digest for the cookie 2478 */ 2479 ep = &(*inp_p)->sctp_ep; 2480 l_inp = *inp_p; 2481 if (l_stcb) { 2482 SCTP_TCB_UNLOCK(l_stcb); 2483 } 2484 SCTP_INP_RLOCK(l_inp); 2485 if (l_stcb) { 2486 SCTP_TCB_LOCK(l_stcb); 2487 } 2488 /* which cookie is it? */ 2489 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2490 (ep->current_secret_number != ep->last_secret_number)) { 2491 /* it's the old cookie */ 2492 (void)sctp_hmac_m(SCTP_HMAC, 2493 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2494 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2495 } else { 2496 /* it's the current cookie */ 2497 (void)sctp_hmac_m(SCTP_HMAC, 2498 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2499 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2500 } 2501 /* get the signature */ 2502 SCTP_INP_RUNLOCK(l_inp); 2503 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2504 if (sig == NULL) { 2505 /* couldn't find signature */ 2506 sctp_m_freem(m_sig); 2507 return (NULL); 2508 } 2509 /* compare the received digest with the computed digest */ 2510 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2511 /* try the old cookie? */ 2512 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2513 (ep->current_secret_number != ep->last_secret_number)) { 2514 /* compute digest with old */ 2515 (void)sctp_hmac_m(SCTP_HMAC, 2516 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2517 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2518 /* compare */ 2519 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2520 cookie_ok = 1; 2521 } 2522 } else { 2523 cookie_ok = 1; 2524 } 2525 2526 /* 2527 * Now before we continue we must reconstruct our mbuf so that 2528 * normal processing of any other chunks will work. 2529 */ 2530 { 2531 struct mbuf *m_at; 2532 2533 m_at = m; 2534 while (SCTP_BUF_NEXT(m_at) != NULL) { 2535 m_at = SCTP_BUF_NEXT(m_at); 2536 } 2537 SCTP_BUF_NEXT(m_at) = m_sig; 2538 } 2539 2540 if (cookie_ok == 0) { 2541 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2542 SCTPDBG(SCTP_DEBUG_INPUT2, 2543 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2544 (uint32_t) offset, cookie_offset, sig_offset); 2545 return (NULL); 2546 } 2547 /* 2548 * check the cookie timestamps to be sure it's not stale 2549 */ 2550 (void)SCTP_GETTIME_TIMEVAL(&now); 2551 /* Expire time is in Ticks, so we convert to seconds */ 2552 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2553 time_expires.tv_usec = cookie->time_entered.tv_usec; 2554 /* 2555 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2556 * is undefined. 2557 */ 2558 if (timevalcmp(&now, &time_expires, >)) { 2559 /* cookie is stale! */ 2560 struct mbuf *op_err; 2561 struct sctp_stale_cookie_msg *scm; 2562 uint32_t tim; 2563 2564 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2565 0, M_NOWAIT, 1, MT_DATA); 2566 if (op_err == NULL) { 2567 /* FOOBAR */ 2568 return (NULL); 2569 } 2570 /* Set the len */ 2571 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2572 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2573 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2574 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2575 (sizeof(uint32_t)))); 2576 /* seconds to usec */ 2577 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2578 /* add in usec */ 2579 if (tim == 0) 2580 tim = now.tv_usec - cookie->time_entered.tv_usec; 2581 scm->time_usec = htonl(tim); 2582 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2583 mflowtype, mflowid, l_inp->fibnum, 2584 vrf_id, port); 2585 return (NULL); 2586 } 2587 /* 2588 * Now we must see with the lookup address if we have an existing 2589 * asoc. This will only happen if we were in the COOKIE-WAIT state 2590 * and a INIT collided with us and somewhere the peer sent the 2591 * cookie on another address besides the single address our assoc 2592 * had for him. In this case we will have one of the tie-tags set at 2593 * least AND the address field in the cookie can be used to look it 2594 * up. 2595 */ 2596 to = NULL; 2597 switch (cookie->addr_type) { 2598 #ifdef INET6 2599 case SCTP_IPV6_ADDRESS: 2600 memset(&sin6, 0, sizeof(sin6)); 2601 sin6.sin6_family = AF_INET6; 2602 sin6.sin6_len = sizeof(sin6); 2603 sin6.sin6_port = sh->src_port; 2604 sin6.sin6_scope_id = cookie->scope_id; 2605 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2606 sizeof(sin6.sin6_addr.s6_addr)); 2607 to = (struct sockaddr *)&sin6; 2608 break; 2609 #endif 2610 #ifdef INET 2611 case SCTP_IPV4_ADDRESS: 2612 memset(&sin, 0, sizeof(sin)); 2613 sin.sin_family = AF_INET; 2614 sin.sin_len = sizeof(sin); 2615 sin.sin_port = sh->src_port; 2616 sin.sin_addr.s_addr = cookie->address[0]; 2617 to = (struct sockaddr *)&sin; 2618 break; 2619 #endif 2620 default: 2621 /* This should not happen */ 2622 return (NULL); 2623 } 2624 if (*stcb == NULL) { 2625 /* Yep, lets check */ 2626 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2627 if (*stcb == NULL) { 2628 /* 2629 * We should have only got back the same inp. If we 2630 * got back a different ep we have a problem. The 2631 * original findep got back l_inp and now 2632 */ 2633 if (l_inp != *inp_p) { 2634 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2635 } 2636 } else { 2637 if (*locked_tcb == NULL) { 2638 /* 2639 * In this case we found the assoc only 2640 * after we locked the create lock. This 2641 * means we are in a colliding case and we 2642 * must make sure that we unlock the tcb if 2643 * its one of the cases where we throw away 2644 * the incoming packets. 2645 */ 2646 *locked_tcb = *stcb; 2647 2648 /* 2649 * We must also increment the inp ref count 2650 * since the ref_count flags was set when we 2651 * did not find the TCB, now we found it 2652 * which reduces the refcount.. we must 2653 * raise it back out to balance it all :-) 2654 */ 2655 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2656 if ((*stcb)->sctp_ep != l_inp) { 2657 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2658 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2659 } 2660 } 2661 } 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2667 cookie, cookie_len, *inp_p, 2668 netp, to, ¬ification, 2669 auth_skipped, auth_offset, auth_len, 2670 mflowtype, mflowid, 2671 vrf_id, port); 2672 } else { 2673 /* this is abnormal... cookie-echo on existing TCB */ 2674 had_a_existing_tcb = 1; 2675 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2676 src, dst, sh, 2677 cookie, cookie_len, *inp_p, *stcb, netp, to, 2678 ¬ification, auth_skipped, auth_offset, auth_len, 2679 mflowtype, mflowid, 2680 vrf_id, port); 2681 } 2682 2683 if (*stcb == NULL) { 2684 /* still no TCB... must be bad cookie-echo */ 2685 return (NULL); 2686 } 2687 if (*netp != NULL) { 2688 (*netp)->flowtype = mflowtype; 2689 (*netp)->flowid = mflowid; 2690 } 2691 /* 2692 * Ok, we built an association so confirm the address we sent the 2693 * INIT-ACK to. 2694 */ 2695 netl = sctp_findnet(*stcb, to); 2696 /* 2697 * This code should in theory NOT run but 2698 */ 2699 if (netl == NULL) { 2700 /* TSNH! Huh, why do I need to add this address here? */ 2701 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2702 return (NULL); 2703 } 2704 netl = sctp_findnet(*stcb, to); 2705 } 2706 if (netl) { 2707 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2708 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2709 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2710 netl); 2711 send_int_conf = 1; 2712 } 2713 } 2714 sctp_start_net_timers(*stcb); 2715 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2716 if (!had_a_existing_tcb || 2717 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2718 /* 2719 * If we have a NEW cookie or the connect never 2720 * reached the connected state during collision we 2721 * must do the TCP accept thing. 2722 */ 2723 struct socket *so, *oso; 2724 struct sctp_inpcb *inp; 2725 2726 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2727 /* 2728 * For a restart we will keep the same 2729 * socket, no need to do anything. I THINK!! 2730 */ 2731 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2732 if (send_int_conf) { 2733 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2734 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2735 } 2736 return (m); 2737 } 2738 oso = (*inp_p)->sctp_socket; 2739 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2740 SCTP_TCB_UNLOCK((*stcb)); 2741 CURVNET_SET(oso->so_vnet); 2742 so = sonewconn(oso, 0 2743 ); 2744 CURVNET_RESTORE(); 2745 SCTP_TCB_LOCK((*stcb)); 2746 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2747 2748 if (so == NULL) { 2749 struct mbuf *op_err; 2750 2751 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2752 struct socket *pcb_so; 2753 2754 #endif 2755 /* Too many sockets */ 2756 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2757 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2758 sctp_abort_association(*inp_p, NULL, m, iphlen, 2759 src, dst, sh, op_err, 2760 mflowtype, mflowid, 2761 vrf_id, port); 2762 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2763 pcb_so = SCTP_INP_SO(*inp_p); 2764 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2765 SCTP_TCB_UNLOCK((*stcb)); 2766 SCTP_SOCKET_LOCK(pcb_so, 1); 2767 SCTP_TCB_LOCK((*stcb)); 2768 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2769 #endif 2770 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2771 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2772 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2773 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2774 #endif 2775 return (NULL); 2776 } 2777 inp = (struct sctp_inpcb *)so->so_pcb; 2778 SCTP_INP_INCR_REF(inp); 2779 /* 2780 * We add the unbound flag here so that if we get an 2781 * soabort() before we get the move_pcb done, we 2782 * will properly cleanup. 2783 */ 2784 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2785 SCTP_PCB_FLAGS_CONNECTED | 2786 SCTP_PCB_FLAGS_IN_TCPPOOL | 2787 SCTP_PCB_FLAGS_UNBOUND | 2788 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2789 SCTP_PCB_FLAGS_DONT_WAKE); 2790 inp->sctp_features = (*inp_p)->sctp_features; 2791 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2792 inp->sctp_socket = so; 2793 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2794 inp->max_cwnd = (*inp_p)->max_cwnd; 2795 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2796 inp->ecn_supported = (*inp_p)->ecn_supported; 2797 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2798 inp->auth_supported = (*inp_p)->auth_supported; 2799 inp->asconf_supported = (*inp_p)->asconf_supported; 2800 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2801 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2802 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2803 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2804 inp->sctp_context = (*inp_p)->sctp_context; 2805 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2806 inp->fibnum = (*inp_p)->fibnum; 2807 inp->inp_starting_point_for_iterator = NULL; 2808 /* 2809 * copy in the authentication parameters from the 2810 * original endpoint 2811 */ 2812 if (inp->sctp_ep.local_hmacs) 2813 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2814 inp->sctp_ep.local_hmacs = 2815 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2816 if (inp->sctp_ep.local_auth_chunks) 2817 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2818 inp->sctp_ep.local_auth_chunks = 2819 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2820 2821 /* 2822 * Now we must move it from one hash table to 2823 * another and get the tcb in the right place. 2824 */ 2825 2826 /* 2827 * This is where the one-2-one socket is put into 2828 * the accept state waiting for the accept! 2829 */ 2830 if (*stcb) { 2831 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2832 } 2833 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2834 2835 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2836 SCTP_TCB_UNLOCK((*stcb)); 2837 2838 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2839 0); 2840 SCTP_TCB_LOCK((*stcb)); 2841 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2842 2843 2844 /* 2845 * now we must check to see if we were aborted while 2846 * the move was going on and the lock/unlock 2847 * happened. 2848 */ 2849 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2850 /* 2851 * yep it was, we leave the assoc attached 2852 * to the socket since the sctp_inpcb_free() 2853 * call will send an abort for us. 2854 */ 2855 SCTP_INP_DECR_REF(inp); 2856 return (NULL); 2857 } 2858 SCTP_INP_DECR_REF(inp); 2859 /* Switch over to the new guy */ 2860 *inp_p = inp; 2861 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2862 if (send_int_conf) { 2863 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2864 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2865 } 2866 /* 2867 * Pull it from the incomplete queue and wake the 2868 * guy 2869 */ 2870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2871 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2872 SCTP_TCB_UNLOCK((*stcb)); 2873 SCTP_SOCKET_LOCK(so, 1); 2874 #endif 2875 soisconnected(so); 2876 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2877 SCTP_TCB_LOCK((*stcb)); 2878 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2879 SCTP_SOCKET_UNLOCK(so, 1); 2880 #endif 2881 return (m); 2882 } 2883 } 2884 if (notification) { 2885 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2886 } 2887 if (send_int_conf) { 2888 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2889 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2890 } 2891 return (m); 2892 } 2893 2894 static void 2895 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2896 struct sctp_tcb *stcb, struct sctp_nets *net) 2897 { 2898 /* cp must not be used, others call this without a c-ack :-) */ 2899 struct sctp_association *asoc; 2900 2901 SCTPDBG(SCTP_DEBUG_INPUT2, 2902 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2903 if ((stcb == NULL) || (net == NULL)) { 2904 return; 2905 } 2906 asoc = &stcb->asoc; 2907 2908 sctp_stop_all_cookie_timers(stcb); 2909 /* process according to association state */ 2910 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2911 /* state change only needed when I am in right state */ 2912 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2913 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2914 sctp_start_net_timers(stcb); 2915 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2916 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2917 stcb->sctp_ep, stcb, asoc->primary_destination); 2918 2919 } 2920 /* update RTO */ 2921 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2922 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2923 if (asoc->overall_error_count == 0) { 2924 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2925 &asoc->time_entered, sctp_align_safe_nocopy, 2926 SCTP_RTT_FROM_NON_DATA); 2927 } 2928 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2929 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2930 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2931 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2933 struct socket *so; 2934 2935 #endif 2936 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2937 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2938 so = SCTP_INP_SO(stcb->sctp_ep); 2939 atomic_add_int(&stcb->asoc.refcnt, 1); 2940 SCTP_TCB_UNLOCK(stcb); 2941 SCTP_SOCKET_LOCK(so, 1); 2942 SCTP_TCB_LOCK(stcb); 2943 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2944 #endif 2945 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2946 soisconnected(stcb->sctp_socket); 2947 } 2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2949 SCTP_SOCKET_UNLOCK(so, 1); 2950 #endif 2951 } 2952 /* 2953 * since we did not send a HB make sure we don't double 2954 * things 2955 */ 2956 net->hb_responded = 1; 2957 2958 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2959 /* 2960 * We don't need to do the asconf thing, nor hb or 2961 * autoclose if the socket is closed. 2962 */ 2963 goto closed_socket; 2964 } 2965 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2966 stcb, net); 2967 2968 2969 if (stcb->asoc.sctp_autoclose_ticks && 2970 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2971 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2972 stcb->sctp_ep, stcb, NULL); 2973 } 2974 /* 2975 * send ASCONF if parameters are pending and ASCONFs are 2976 * allowed (eg. addresses changed when init/cookie echo were 2977 * in flight) 2978 */ 2979 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2980 (stcb->asoc.asconf_supported == 1) && 2981 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2982 #ifdef SCTP_TIMER_BASED_ASCONF 2983 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2984 stcb->sctp_ep, stcb, 2985 stcb->asoc.primary_destination); 2986 #else 2987 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2988 SCTP_ADDR_NOT_LOCKED); 2989 #endif 2990 } 2991 } 2992 closed_socket: 2993 /* Toss the cookie if I can */ 2994 sctp_toss_old_cookies(stcb, asoc); 2995 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2996 /* Restart the timer if we have pending data */ 2997 struct sctp_tmit_chunk *chk; 2998 2999 chk = TAILQ_FIRST(&asoc->sent_queue); 3000 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3001 } 3002 } 3003 3004 static void 3005 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3006 struct sctp_tcb *stcb) 3007 { 3008 struct sctp_nets *net; 3009 struct sctp_tmit_chunk *lchk; 3010 struct sctp_ecne_chunk bkup; 3011 uint8_t override_bit; 3012 uint32_t tsn, window_data_tsn; 3013 int len; 3014 unsigned int pkt_cnt; 3015 3016 len = ntohs(cp->ch.chunk_length); 3017 if ((len != sizeof(struct sctp_ecne_chunk)) && 3018 (len != sizeof(struct old_sctp_ecne_chunk))) { 3019 return; 3020 } 3021 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3022 /* Its the old format */ 3023 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3024 bkup.num_pkts_since_cwr = htonl(1); 3025 cp = &bkup; 3026 } 3027 SCTP_STAT_INCR(sctps_recvecne); 3028 tsn = ntohl(cp->tsn); 3029 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3030 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3031 if (lchk == NULL) { 3032 window_data_tsn = stcb->asoc.sending_seq - 1; 3033 } else { 3034 window_data_tsn = lchk->rec.data.TSN_seq; 3035 } 3036 3037 /* Find where it was sent to if possible. */ 3038 net = NULL; 3039 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3040 if (lchk->rec.data.TSN_seq == tsn) { 3041 net = lchk->whoTo; 3042 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3043 break; 3044 } 3045 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3046 break; 3047 } 3048 } 3049 if (net == NULL) { 3050 /* 3051 * What to do. A previous send of a CWR was possibly lost. 3052 * See how old it is, we may have it marked on the actual 3053 * net. 3054 */ 3055 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3056 if (tsn == net->last_cwr_tsn) { 3057 /* Found him, send it off */ 3058 break; 3059 } 3060 } 3061 if (net == NULL) { 3062 /* 3063 * If we reach here, we need to send a special CWR 3064 * that says hey, we did this a long time ago and 3065 * you lost the response. 3066 */ 3067 net = TAILQ_FIRST(&stcb->asoc.nets); 3068 if (net == NULL) { 3069 /* TSNH */ 3070 return; 3071 } 3072 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3073 } else { 3074 override_bit = 0; 3075 } 3076 } else { 3077 override_bit = 0; 3078 } 3079 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3080 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3081 /* 3082 * JRS - Use the congestion control given in the pluggable 3083 * CC module 3084 */ 3085 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3086 /* 3087 * We reduce once every RTT. So we will only lower cwnd at 3088 * the next sending seq i.e. the window_data_tsn 3089 */ 3090 net->cwr_window_tsn = window_data_tsn; 3091 net->ecn_ce_pkt_cnt += pkt_cnt; 3092 net->lost_cnt = pkt_cnt; 3093 net->last_cwr_tsn = tsn; 3094 } else { 3095 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3096 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3097 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3098 /* 3099 * Another loss in the same window update how many 3100 * marks/packets lost we have had. 3101 */ 3102 int cnt = 1; 3103 3104 if (pkt_cnt > net->lost_cnt) { 3105 /* Should be the case */ 3106 cnt = (pkt_cnt - net->lost_cnt); 3107 net->ecn_ce_pkt_cnt += cnt; 3108 } 3109 net->lost_cnt = pkt_cnt; 3110 net->last_cwr_tsn = tsn; 3111 /* 3112 * Most CC functions will ignore this call, since we 3113 * are in-window yet of the initial CE the peer saw. 3114 */ 3115 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3116 } 3117 } 3118 /* 3119 * We always send a CWR this way if our previous one was lost our 3120 * peer will get an update, or if it is not time again to reduce we 3121 * still get the cwr to the peer. Note we set the override when we 3122 * could not find the TSN on the chunk or the destination network. 3123 */ 3124 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3125 } 3126 3127 static void 3128 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3129 { 3130 /* 3131 * Here we get a CWR from the peer. We must look in the outqueue and 3132 * make sure that we have a covered ECNE in the control chunk part. 3133 * If so remove it. 3134 */ 3135 struct sctp_tmit_chunk *chk; 3136 struct sctp_ecne_chunk *ecne; 3137 int override; 3138 uint32_t cwr_tsn; 3139 3140 cwr_tsn = ntohl(cp->tsn); 3141 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3142 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3143 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3144 continue; 3145 } 3146 if ((override == 0) && (chk->whoTo != net)) { 3147 /* Must be from the right src unless override is set */ 3148 continue; 3149 } 3150 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3151 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3152 /* this covers this ECNE, we can remove it */ 3153 stcb->asoc.ecn_echo_cnt_onq--; 3154 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3155 sctp_next); 3156 sctp_m_freem(chk->data); 3157 chk->data = NULL; 3158 stcb->asoc.ctrl_queue_cnt--; 3159 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3160 if (override == 0) { 3161 break; 3162 } 3163 } 3164 } 3165 } 3166 3167 static void 3168 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3169 struct sctp_tcb *stcb, struct sctp_nets *net) 3170 { 3171 struct sctp_association *asoc; 3172 3173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3174 struct socket *so; 3175 3176 #endif 3177 3178 SCTPDBG(SCTP_DEBUG_INPUT2, 3179 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3180 if (stcb == NULL) 3181 return; 3182 3183 asoc = &stcb->asoc; 3184 /* process according to association state */ 3185 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3186 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3187 SCTPDBG(SCTP_DEBUG_INPUT2, 3188 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3189 SCTP_TCB_UNLOCK(stcb); 3190 return; 3191 } 3192 /* notify upper layer protocol */ 3193 if (stcb->sctp_socket) { 3194 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3195 } 3196 #ifdef INVARIANTS 3197 if (!TAILQ_EMPTY(&asoc->send_queue) || 3198 !TAILQ_EMPTY(&asoc->sent_queue) || 3199 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3200 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3201 } 3202 #endif 3203 /* stop the timer */ 3204 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3205 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3206 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3207 /* free the TCB */ 3208 SCTPDBG(SCTP_DEBUG_INPUT2, 3209 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3211 so = SCTP_INP_SO(stcb->sctp_ep); 3212 atomic_add_int(&stcb->asoc.refcnt, 1); 3213 SCTP_TCB_UNLOCK(stcb); 3214 SCTP_SOCKET_LOCK(so, 1); 3215 SCTP_TCB_LOCK(stcb); 3216 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3217 #endif 3218 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3219 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3221 SCTP_SOCKET_UNLOCK(so, 1); 3222 #endif 3223 return; 3224 } 3225 3226 static int 3227 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3228 struct sctp_nets *net, uint8_t flg) 3229 { 3230 switch (desc->chunk_type) { 3231 case SCTP_DATA: 3232 /* find the tsn to resend (possibly */ 3233 { 3234 uint32_t tsn; 3235 struct sctp_tmit_chunk *tp1; 3236 3237 tsn = ntohl(desc->tsn_ifany); 3238 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3239 if (tp1->rec.data.TSN_seq == tsn) { 3240 /* found it */ 3241 break; 3242 } 3243 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3244 /* not found */ 3245 tp1 = NULL; 3246 break; 3247 } 3248 } 3249 if (tp1 == NULL) { 3250 /* 3251 * Do it the other way , aka without paying 3252 * attention to queue seq order. 3253 */ 3254 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3255 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3256 if (tp1->rec.data.TSN_seq == tsn) { 3257 /* found it */ 3258 break; 3259 } 3260 } 3261 } 3262 if (tp1 == NULL) { 3263 SCTP_STAT_INCR(sctps_pdrptsnnf); 3264 } 3265 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3266 uint8_t *ddp; 3267 3268 if (((flg & SCTP_BADCRC) == 0) && 3269 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3270 return (0); 3271 } 3272 if ((stcb->asoc.peers_rwnd == 0) && 3273 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3274 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3275 return (0); 3276 } 3277 if (stcb->asoc.peers_rwnd == 0 && 3278 (flg & SCTP_FROM_MIDDLE_BOX)) { 3279 SCTP_STAT_INCR(sctps_pdrpdizrw); 3280 return (0); 3281 } 3282 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3283 sizeof(struct sctp_data_chunk)); 3284 { 3285 unsigned int iii; 3286 3287 for (iii = 0; iii < sizeof(desc->data_bytes); 3288 iii++) { 3289 if (ddp[iii] != desc->data_bytes[iii]) { 3290 SCTP_STAT_INCR(sctps_pdrpbadd); 3291 return (-1); 3292 } 3293 } 3294 } 3295 3296 if (tp1->do_rtt) { 3297 /* 3298 * this guy had a RTO calculation 3299 * pending on it, cancel it 3300 */ 3301 if (tp1->whoTo->rto_needed == 0) { 3302 tp1->whoTo->rto_needed = 1; 3303 } 3304 tp1->do_rtt = 0; 3305 } 3306 SCTP_STAT_INCR(sctps_pdrpmark); 3307 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3308 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3309 /* 3310 * mark it as if we were doing a FR, since 3311 * we will be getting gap ack reports behind 3312 * the info from the router. 3313 */ 3314 tp1->rec.data.doing_fast_retransmit = 1; 3315 /* 3316 * mark the tsn with what sequences can 3317 * cause a new FR. 3318 */ 3319 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3320 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3321 } else { 3322 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3323 } 3324 3325 /* restart the timer */ 3326 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3327 stcb, tp1->whoTo, 3328 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 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, 3397 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3398 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3399 } 3400 break; 3401 case SCTP_SELECTIVE_ACK: 3402 case SCTP_NR_SELECTIVE_ACK: 3403 /* resend the sack */ 3404 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3405 break; 3406 case SCTP_HEARTBEAT_REQUEST: 3407 /* resend a demand HB */ 3408 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3409 /* 3410 * Only retransmit if we KNOW we wont destroy the 3411 * tcb 3412 */ 3413 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3414 } 3415 break; 3416 case SCTP_SHUTDOWN: 3417 sctp_send_shutdown(stcb, net); 3418 break; 3419 case SCTP_SHUTDOWN_ACK: 3420 sctp_send_shutdown_ack(stcb, net); 3421 break; 3422 case SCTP_COOKIE_ECHO: 3423 { 3424 struct sctp_tmit_chunk *cookie; 3425 3426 cookie = NULL; 3427 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3428 sctp_next) { 3429 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3430 break; 3431 } 3432 } 3433 if (cookie) { 3434 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3435 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3436 cookie->sent = SCTP_DATAGRAM_RESEND; 3437 sctp_stop_all_cookie_timers(stcb); 3438 } 3439 } 3440 break; 3441 case SCTP_COOKIE_ACK: 3442 sctp_send_cookie_ack(stcb); 3443 break; 3444 case SCTP_ASCONF_ACK: 3445 /* resend last asconf ack */ 3446 sctp_send_asconf_ack(stcb); 3447 break; 3448 case SCTP_FORWARD_CUM_TSN: 3449 send_forward_tsn(stcb, &stcb->asoc); 3450 break; 3451 /* can't do anything with these */ 3452 case SCTP_PACKET_DROPPED: 3453 case SCTP_INITIATION_ACK: /* this should not happen */ 3454 case SCTP_HEARTBEAT_ACK: 3455 case SCTP_ABORT_ASSOCIATION: 3456 case SCTP_OPERATION_ERROR: 3457 case SCTP_SHUTDOWN_COMPLETE: 3458 case SCTP_ECN_ECHO: 3459 case SCTP_ECN_CWR: 3460 default: 3461 break; 3462 } 3463 return (0); 3464 } 3465 3466 void 3467 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3468 { 3469 uint32_t i; 3470 uint16_t temp; 3471 3472 /* 3473 * We set things to 0xffff since this is the last delivered sequence 3474 * and we will be sending in 0 after the reset. 3475 */ 3476 3477 if (number_entries) { 3478 for (i = 0; i < number_entries; i++) { 3479 temp = ntohs(list[i]); 3480 if (temp >= stcb->asoc.streamincnt) { 3481 continue; 3482 } 3483 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3484 } 3485 } else { 3486 list = NULL; 3487 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3488 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3489 } 3490 } 3491 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3492 } 3493 3494 static void 3495 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3496 { 3497 uint32_t i; 3498 uint16_t temp; 3499 3500 if (number_entries > 0) { 3501 for (i = 0; i < number_entries; i++) { 3502 temp = ntohs(list[i]); 3503 if (temp >= stcb->asoc.streamoutcnt) { 3504 /* no such stream */ 3505 continue; 3506 } 3507 stcb->asoc.strmout[temp].next_sequence_send = 0; 3508 } 3509 } else { 3510 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3511 stcb->asoc.strmout[i].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 static void 3518 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3519 { 3520 uint32_t i; 3521 uint16_t temp; 3522 3523 if (number_entries > 0) { 3524 for (i = 0; i < number_entries; i++) { 3525 temp = ntohs(list[i]); 3526 if (temp >= stcb->asoc.streamoutcnt) { 3527 /* no such stream */ 3528 continue; 3529 } 3530 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3531 } 3532 } else { 3533 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3534 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3535 } 3536 } 3537 } 3538 3539 3540 struct sctp_stream_reset_request * 3541 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3542 { 3543 struct sctp_association *asoc; 3544 struct sctp_chunkhdr *ch; 3545 struct sctp_stream_reset_request *r; 3546 struct sctp_tmit_chunk *chk; 3547 int len, clen; 3548 3549 asoc = &stcb->asoc; 3550 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3551 asoc->stream_reset_outstanding = 0; 3552 return (NULL); 3553 } 3554 if (stcb->asoc.str_reset == NULL) { 3555 asoc->stream_reset_outstanding = 0; 3556 return (NULL); 3557 } 3558 chk = stcb->asoc.str_reset; 3559 if (chk->data == NULL) { 3560 return (NULL); 3561 } 3562 if (bchk) { 3563 /* he wants a copy of the chk pointer */ 3564 *bchk = chk; 3565 } 3566 clen = chk->send_size; 3567 ch = mtod(chk->data, struct sctp_chunkhdr *); 3568 r = (struct sctp_stream_reset_request *)(ch + 1); 3569 if (ntohl(r->request_seq) == seq) { 3570 /* found it */ 3571 return (r); 3572 } 3573 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3574 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3575 /* move to the next one, there can only be a max of two */ 3576 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3577 if (ntohl(r->request_seq) == seq) { 3578 return (r); 3579 } 3580 } 3581 /* that seq is not here */ 3582 return (NULL); 3583 } 3584 3585 static void 3586 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3587 { 3588 struct sctp_association *asoc; 3589 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3590 3591 if (stcb->asoc.str_reset == NULL) { 3592 return; 3593 } 3594 asoc = &stcb->asoc; 3595 3596 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3597 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3598 TAILQ_REMOVE(&asoc->control_send_queue, 3599 chk, 3600 sctp_next); 3601 if (chk->data) { 3602 sctp_m_freem(chk->data); 3603 chk->data = NULL; 3604 } 3605 asoc->ctrl_queue_cnt--; 3606 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3607 /* sa_ignore NO_NULL_CHK */ 3608 stcb->asoc.str_reset = NULL; 3609 } 3610 3611 3612 static int 3613 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3614 uint32_t seq, uint32_t action, 3615 struct sctp_stream_reset_response *respin) 3616 { 3617 uint16_t type; 3618 int lparm_len; 3619 struct sctp_association *asoc = &stcb->asoc; 3620 struct sctp_tmit_chunk *chk; 3621 struct sctp_stream_reset_request *req_param; 3622 struct sctp_stream_reset_out_request *req_out_param; 3623 struct sctp_stream_reset_in_request *req_in_param; 3624 uint32_t number_entries; 3625 3626 if (asoc->stream_reset_outstanding == 0) { 3627 /* duplicate */ 3628 return (0); 3629 } 3630 if (seq == stcb->asoc.str_reset_seq_out) { 3631 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3632 if (req_param != NULL) { 3633 stcb->asoc.str_reset_seq_out++; 3634 type = ntohs(req_param->ph.param_type); 3635 lparm_len = ntohs(req_param->ph.param_length); 3636 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3637 int no_clear = 0; 3638 3639 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3640 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3641 asoc->stream_reset_out_is_outstanding = 0; 3642 if (asoc->stream_reset_outstanding) 3643 asoc->stream_reset_outstanding--; 3644 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3645 /* do it */ 3646 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3647 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3648 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3649 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3650 /* 3651 * Set it up so we don't stop 3652 * retransmitting 3653 */ 3654 stcb->asoc.str_reset_seq_out--; 3655 asoc->stream_reset_out_is_outstanding = 1; 3656 no_clear = 1; 3657 } else { 3658 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3659 } 3660 if (no_clear == 0) { 3661 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3662 } 3663 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3664 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3665 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3666 if (asoc->stream_reset_outstanding) 3667 asoc->stream_reset_outstanding--; 3668 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3669 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3670 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3671 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3672 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3673 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3674 } 3675 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3676 /* Ok we now may have more streams */ 3677 int num_stream; 3678 3679 num_stream = stcb->asoc.strm_pending_add_size; 3680 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3681 /* TSNH */ 3682 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3683 } 3684 stcb->asoc.strm_pending_add_size = 0; 3685 if (asoc->stream_reset_outstanding) 3686 asoc->stream_reset_outstanding--; 3687 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3688 /* Put the new streams into effect */ 3689 int i; 3690 3691 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3692 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3693 } 3694 asoc->streamoutcnt += num_stream; 3695 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3696 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3697 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3698 SCTP_STREAM_CHANGE_DENIED); 3699 } else { 3700 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3701 SCTP_STREAM_CHANGE_FAILED); 3702 } 3703 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3704 if (asoc->stream_reset_outstanding) 3705 asoc->stream_reset_outstanding--; 3706 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3707 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3708 SCTP_STREAM_CHANGE_DENIED); 3709 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3710 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3711 SCTP_STREAM_CHANGE_FAILED); 3712 } 3713 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3714 /** 3715 * a) Adopt the new in tsn. 3716 * b) reset the map 3717 * c) Adopt the new out-tsn 3718 */ 3719 struct sctp_stream_reset_response_tsn *resp; 3720 struct sctp_forward_tsn_chunk fwdtsn; 3721 int abort_flag = 0; 3722 3723 if (respin == NULL) { 3724 /* huh ? */ 3725 return (0); 3726 } 3727 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3728 return (0); 3729 } 3730 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3731 resp = (struct sctp_stream_reset_response_tsn *)respin; 3732 asoc->stream_reset_outstanding--; 3733 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3734 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3735 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3736 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3737 if (abort_flag) { 3738 return (1); 3739 } 3740 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3741 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3742 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3743 } 3744 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3745 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3746 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3747 3748 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3749 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3750 3751 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3752 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3753 3754 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3755 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3756 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3757 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3758 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3759 SCTP_ASSOC_RESET_DENIED); 3760 } else { 3761 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3762 SCTP_ASSOC_RESET_FAILED); 3763 } 3764 } 3765 /* get rid of the request and get the request flags */ 3766 if (asoc->stream_reset_outstanding == 0) { 3767 sctp_clean_up_stream_reset(stcb); 3768 } 3769 } 3770 } 3771 if (asoc->stream_reset_outstanding == 0) { 3772 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3773 } 3774 return (0); 3775 } 3776 3777 static void 3778 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3779 struct sctp_tmit_chunk *chk, 3780 struct sctp_stream_reset_in_request *req, int trunc) 3781 { 3782 uint32_t seq; 3783 int len, i; 3784 int number_entries; 3785 uint16_t temp; 3786 3787 /* 3788 * peer wants me to send a str-reset to him for my outgoing seq's if 3789 * seq_in is right. 3790 */ 3791 struct sctp_association *asoc = &stcb->asoc; 3792 3793 seq = ntohl(req->request_seq); 3794 if (asoc->str_reset_seq_in == seq) { 3795 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3796 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3797 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3798 } else if (trunc) { 3799 /* Can't do it, since they exceeded our buffer size */ 3800 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3801 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3802 len = ntohs(req->ph.param_length); 3803 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3804 if (number_entries) { 3805 for (i = 0; i < number_entries; i++) { 3806 temp = ntohs(req->list_of_streams[i]); 3807 if (temp >= stcb->asoc.streamoutcnt) { 3808 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3809 goto bad_boy; 3810 } 3811 req->list_of_streams[i] = temp; 3812 } 3813 for (i = 0; i < number_entries; i++) { 3814 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3815 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3816 } 3817 } 3818 } else { 3819 /* Its all */ 3820 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3821 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3822 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3823 } 3824 } 3825 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3826 } else { 3827 /* Can't do it, since we have sent one out */ 3828 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3829 } 3830 bad_boy: 3831 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3832 asoc->str_reset_seq_in++; 3833 } else if (asoc->str_reset_seq_in - 1 == seq) { 3834 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3835 } else if (asoc->str_reset_seq_in - 2 == seq) { 3836 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3837 } else { 3838 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3839 } 3840 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3841 } 3842 3843 static int 3844 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3845 struct sctp_tmit_chunk *chk, 3846 struct sctp_stream_reset_tsn_request *req) 3847 { 3848 /* reset all in and out and update the tsn */ 3849 /* 3850 * A) reset my str-seq's on in and out. B) Select a receive next, 3851 * and set cum-ack to it. Also process this selected number as a 3852 * fwd-tsn as well. C) set in the response my next sending seq. 3853 */ 3854 struct sctp_forward_tsn_chunk fwdtsn; 3855 struct sctp_association *asoc = &stcb->asoc; 3856 int abort_flag = 0; 3857 uint32_t seq; 3858 3859 seq = ntohl(req->request_seq); 3860 if (asoc->str_reset_seq_in == seq) { 3861 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3862 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3863 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3864 } else { 3865 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3866 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3867 fwdtsn.ch.chunk_flags = 0; 3868 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3869 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3870 if (abort_flag) { 3871 return (1); 3872 } 3873 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3874 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3875 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3876 } 3877 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3878 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3879 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3880 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3881 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3882 atomic_add_int(&asoc->sending_seq, 1); 3883 /* save off historical data for retrans */ 3884 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3885 asoc->last_sending_seq[0] = asoc->sending_seq; 3886 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3887 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3888 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3889 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3890 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3891 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3892 } 3893 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3894 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3895 asoc->str_reset_seq_in++; 3896 } else if (asoc->str_reset_seq_in - 1 == seq) { 3897 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3898 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3899 } else if (asoc->str_reset_seq_in - 2 == seq) { 3900 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3901 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3902 } else { 3903 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3904 } 3905 return (0); 3906 } 3907 3908 static void 3909 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3910 struct sctp_tmit_chunk *chk, 3911 struct sctp_stream_reset_out_request *req, int trunc) 3912 { 3913 uint32_t seq, tsn; 3914 int number_entries, len; 3915 struct sctp_association *asoc = &stcb->asoc; 3916 3917 seq = ntohl(req->request_seq); 3918 3919 /* now if its not a duplicate we process it */ 3920 if (asoc->str_reset_seq_in == seq) { 3921 len = ntohs(req->ph.param_length); 3922 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3923 /* 3924 * the sender is resetting, handle the list issue.. we must 3925 * a) verify if we can do the reset, if so no problem b) If 3926 * we can't do the reset we must copy the request. c) queue 3927 * it, and setup the data in processor to trigger it off 3928 * when needed and dequeue all the queued data. 3929 */ 3930 tsn = ntohl(req->send_reset_at_tsn); 3931 3932 /* move the reset action back one */ 3933 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3934 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3935 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3936 } else if (trunc) { 3937 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3938 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3939 /* we can do it now */ 3940 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3941 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3942 } else { 3943 /* 3944 * we must queue it up and thus wait for the TSN's 3945 * to arrive that are at or before tsn 3946 */ 3947 struct sctp_stream_reset_list *liste; 3948 int siz; 3949 3950 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3951 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3952 siz, SCTP_M_STRESET); 3953 if (liste == NULL) { 3954 /* gak out of memory */ 3955 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3956 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3957 return; 3958 } 3959 liste->seq = seq; 3960 liste->tsn = tsn; 3961 liste->number_entries = number_entries; 3962 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3963 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3964 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3965 } 3966 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3967 asoc->str_reset_seq_in++; 3968 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3969 /* 3970 * one seq back, just echo back last action since my 3971 * response was lost. 3972 */ 3973 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3974 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3975 /* 3976 * two seq back, just echo back last action since my 3977 * response was lost. 3978 */ 3979 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3980 } else { 3981 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3982 } 3983 } 3984 3985 static void 3986 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3987 struct sctp_stream_reset_add_strm *str_add) 3988 { 3989 /* 3990 * Peer is requesting to add more streams. If its within our 3991 * max-streams we will allow it. 3992 */ 3993 uint32_t num_stream, i; 3994 uint32_t seq; 3995 struct sctp_association *asoc = &stcb->asoc; 3996 struct sctp_queued_to_read *ctl, *nctl; 3997 3998 /* Get the number. */ 3999 seq = ntohl(str_add->request_seq); 4000 num_stream = ntohs(str_add->number_of_streams); 4001 /* Now what would be the new total? */ 4002 if (asoc->str_reset_seq_in == seq) { 4003 num_stream += stcb->asoc.streamincnt; 4004 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4005 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4006 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4007 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4008 (num_stream > 0xffff)) { 4009 /* We must reject it they ask for to many */ 4010 denied: 4011 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4012 } else { 4013 /* Ok, we can do that :-) */ 4014 struct sctp_stream_in *oldstrm; 4015 4016 /* save off the old */ 4017 oldstrm = stcb->asoc.strmin; 4018 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4019 (num_stream * sizeof(struct sctp_stream_in)), 4020 SCTP_M_STRMI); 4021 if (stcb->asoc.strmin == NULL) { 4022 stcb->asoc.strmin = oldstrm; 4023 goto denied; 4024 } 4025 /* copy off the old data */ 4026 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4027 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4028 stcb->asoc.strmin[i].stream_no = i; 4029 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4030 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4031 /* now anything on those queues? */ 4032 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4033 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4034 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4035 } 4036 } 4037 /* Init the new streams */ 4038 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4039 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4040 stcb->asoc.strmin[i].stream_no = i; 4041 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4042 stcb->asoc.strmin[i].delivery_started = 0; 4043 } 4044 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4045 /* update the size */ 4046 stcb->asoc.streamincnt = num_stream; 4047 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4048 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4049 } 4050 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4051 asoc->str_reset_seq_in++; 4052 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4053 /* 4054 * one seq back, just echo back last action since my 4055 * response was lost. 4056 */ 4057 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4058 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4059 /* 4060 * two seq back, just echo back last action since my 4061 * response was lost. 4062 */ 4063 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4064 } else { 4065 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4066 4067 } 4068 } 4069 4070 static void 4071 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4072 struct sctp_stream_reset_add_strm *str_add) 4073 { 4074 /* 4075 * Peer is requesting to add more streams. If its within our 4076 * max-streams we will allow it. 4077 */ 4078 uint16_t num_stream; 4079 uint32_t seq; 4080 struct sctp_association *asoc = &stcb->asoc; 4081 4082 /* Get the number. */ 4083 seq = ntohl(str_add->request_seq); 4084 num_stream = ntohs(str_add->number_of_streams); 4085 /* Now what would be the new total? */ 4086 if (asoc->str_reset_seq_in == seq) { 4087 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4088 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4089 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4090 } else if (stcb->asoc.stream_reset_outstanding) { 4091 /* We must reject it we have something pending */ 4092 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4093 } else { 4094 /* Ok, we can do that :-) */ 4095 int mychk; 4096 4097 mychk = stcb->asoc.streamoutcnt; 4098 mychk += num_stream; 4099 if (mychk < 0x10000) { 4100 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4101 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4102 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4103 } 4104 } else { 4105 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4106 } 4107 } 4108 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4109 asoc->str_reset_seq_in++; 4110 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4111 /* 4112 * one seq back, just echo back last action since my 4113 * response was lost. 4114 */ 4115 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4116 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4117 /* 4118 * two seq back, just echo back last action since my 4119 * response was lost. 4120 */ 4121 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4122 } else { 4123 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4124 } 4125 } 4126 4127 #ifdef __GNUC__ 4128 __attribute__((noinline)) 4129 #endif 4130 static int 4131 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4132 struct sctp_chunkhdr *ch_req) 4133 { 4134 uint16_t remaining_length, param_len, ptype; 4135 struct sctp_paramhdr pstore; 4136 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4137 uint32_t seq = 0; 4138 int num_req = 0; 4139 int trunc = 0; 4140 struct sctp_tmit_chunk *chk; 4141 struct sctp_chunkhdr *ch; 4142 struct sctp_paramhdr *ph; 4143 int ret_code = 0; 4144 int num_param = 0; 4145 4146 /* now it may be a reset or a reset-response */ 4147 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4148 4149 /* setup for adding the response */ 4150 sctp_alloc_a_chunk(stcb, chk); 4151 if (chk == NULL) { 4152 return (ret_code); 4153 } 4154 chk->copy_by_ref = 0; 4155 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4156 chk->rec.chunk_id.can_take_data = 0; 4157 chk->flags = 0; 4158 chk->asoc = &stcb->asoc; 4159 chk->no_fr_allowed = 0; 4160 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4161 chk->book_size_scale = 0; 4162 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4163 if (chk->data == NULL) { 4164 strres_nochunk: 4165 if (chk->data) { 4166 sctp_m_freem(chk->data); 4167 chk->data = NULL; 4168 } 4169 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4170 return (ret_code); 4171 } 4172 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4173 4174 /* setup chunk parameters */ 4175 chk->sent = SCTP_DATAGRAM_UNSENT; 4176 chk->snd_count = 0; 4177 chk->whoTo = NULL; 4178 4179 ch = mtod(chk->data, struct sctp_chunkhdr *); 4180 ch->chunk_type = SCTP_STREAM_RESET; 4181 ch->chunk_flags = 0; 4182 ch->chunk_length = htons(chk->send_size); 4183 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4184 offset += sizeof(struct sctp_chunkhdr); 4185 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4186 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4187 if (ph == NULL) { 4188 /* TSNH */ 4189 break; 4190 } 4191 param_len = ntohs(ph->param_length); 4192 if ((param_len > remaining_length) || 4193 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4194 /* bad parameter length */ 4195 break; 4196 } 4197 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4198 (uint8_t *) & cstore); 4199 if (ph == NULL) { 4200 /* TSNH */ 4201 break; 4202 } 4203 ptype = ntohs(ph->param_type); 4204 num_param++; 4205 if (param_len > sizeof(cstore)) { 4206 trunc = 1; 4207 } else { 4208 trunc = 0; 4209 } 4210 if (num_param > SCTP_MAX_RESET_PARAMS) { 4211 /* hit the max of parameters already sorry.. */ 4212 break; 4213 } 4214 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4215 struct sctp_stream_reset_out_request *req_out; 4216 4217 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4218 break; 4219 } 4220 req_out = (struct sctp_stream_reset_out_request *)ph; 4221 num_req++; 4222 if (stcb->asoc.stream_reset_outstanding) { 4223 seq = ntohl(req_out->response_seq); 4224 if (seq == stcb->asoc.str_reset_seq_out) { 4225 /* implicit ack */ 4226 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4227 } 4228 } 4229 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4230 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4231 struct sctp_stream_reset_add_strm *str_add; 4232 4233 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4234 break; 4235 } 4236 str_add = (struct sctp_stream_reset_add_strm *)ph; 4237 num_req++; 4238 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4239 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4240 struct sctp_stream_reset_add_strm *str_add; 4241 4242 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4243 break; 4244 } 4245 str_add = (struct sctp_stream_reset_add_strm *)ph; 4246 num_req++; 4247 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4248 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4249 struct sctp_stream_reset_in_request *req_in; 4250 4251 num_req++; 4252 req_in = (struct sctp_stream_reset_in_request *)ph; 4253 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4254 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4255 struct sctp_stream_reset_tsn_request *req_tsn; 4256 4257 num_req++; 4258 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4259 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4260 ret_code = 1; 4261 goto strres_nochunk; 4262 } 4263 /* no more */ 4264 break; 4265 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4266 struct sctp_stream_reset_response *resp; 4267 uint32_t result; 4268 4269 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4270 break; 4271 } 4272 resp = (struct sctp_stream_reset_response *)ph; 4273 seq = ntohl(resp->response_seq); 4274 result = ntohl(resp->result); 4275 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4276 ret_code = 1; 4277 goto strres_nochunk; 4278 } 4279 } else { 4280 break; 4281 } 4282 offset += SCTP_SIZE32(param_len); 4283 if (remaining_length >= SCTP_SIZE32(param_len)) { 4284 remaining_length -= SCTP_SIZE32(param_len); 4285 } else { 4286 remaining_length = 0; 4287 } 4288 } 4289 if (num_req == 0) { 4290 /* we have no response free the stuff */ 4291 goto strres_nochunk; 4292 } 4293 /* ok we have a chunk to link in */ 4294 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4295 chk, 4296 sctp_next); 4297 stcb->asoc.ctrl_queue_cnt++; 4298 return (ret_code); 4299 } 4300 4301 /* 4302 * Handle a router or endpoints report of a packet loss, there are two ways 4303 * to handle this, either we get the whole packet and must disect it 4304 * ourselves (possibly with truncation and or corruption) or it is a summary 4305 * from a middle box that did the disectting for us. 4306 */ 4307 static void 4308 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4309 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4310 { 4311 uint32_t bottle_bw, on_queue; 4312 uint16_t trunc_len; 4313 unsigned int chlen; 4314 unsigned int at; 4315 struct sctp_chunk_desc desc; 4316 struct sctp_chunkhdr *ch; 4317 4318 chlen = ntohs(cp->ch.chunk_length); 4319 chlen -= sizeof(struct sctp_pktdrop_chunk); 4320 /* XXX possible chlen underflow */ 4321 if (chlen == 0) { 4322 ch = NULL; 4323 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4324 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4325 } else { 4326 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4327 chlen -= sizeof(struct sctphdr); 4328 /* XXX possible chlen underflow */ 4329 memset(&desc, 0, sizeof(desc)); 4330 } 4331 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4332 if (trunc_len > limit) { 4333 trunc_len = limit; 4334 } 4335 /* now the chunks themselves */ 4336 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4337 desc.chunk_type = ch->chunk_type; 4338 /* get amount we need to move */ 4339 at = ntohs(ch->chunk_length); 4340 if (at < sizeof(struct sctp_chunkhdr)) { 4341 /* corrupt chunk, maybe at the end? */ 4342 SCTP_STAT_INCR(sctps_pdrpcrupt); 4343 break; 4344 } 4345 if (trunc_len == 0) { 4346 /* we are supposed to have all of it */ 4347 if (at > chlen) { 4348 /* corrupt skip it */ 4349 SCTP_STAT_INCR(sctps_pdrpcrupt); 4350 break; 4351 } 4352 } else { 4353 /* is there enough of it left ? */ 4354 if (desc.chunk_type == SCTP_DATA) { 4355 if (chlen < (sizeof(struct sctp_data_chunk) + 4356 sizeof(desc.data_bytes))) { 4357 break; 4358 } 4359 } else { 4360 if (chlen < sizeof(struct sctp_chunkhdr)) { 4361 break; 4362 } 4363 } 4364 } 4365 if (desc.chunk_type == SCTP_DATA) { 4366 /* can we get out the tsn? */ 4367 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4368 SCTP_STAT_INCR(sctps_pdrpmbda); 4369 4370 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4371 /* yep */ 4372 struct sctp_data_chunk *dcp; 4373 uint8_t *ddp; 4374 unsigned int iii; 4375 4376 dcp = (struct sctp_data_chunk *)ch; 4377 ddp = (uint8_t *) (dcp + 1); 4378 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4379 desc.data_bytes[iii] = ddp[iii]; 4380 } 4381 desc.tsn_ifany = dcp->dp.tsn; 4382 } else { 4383 /* nope we are done. */ 4384 SCTP_STAT_INCR(sctps_pdrpnedat); 4385 break; 4386 } 4387 } else { 4388 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4389 SCTP_STAT_INCR(sctps_pdrpmbct); 4390 } 4391 4392 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4393 SCTP_STAT_INCR(sctps_pdrppdbrk); 4394 break; 4395 } 4396 if (SCTP_SIZE32(at) > chlen) { 4397 break; 4398 } 4399 chlen -= SCTP_SIZE32(at); 4400 if (chlen < sizeof(struct sctp_chunkhdr)) { 4401 /* done, none left */ 4402 break; 4403 } 4404 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4405 } 4406 /* Now update any rwnd --- possibly */ 4407 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4408 /* From a peer, we get a rwnd report */ 4409 uint32_t a_rwnd; 4410 4411 SCTP_STAT_INCR(sctps_pdrpfehos); 4412 4413 bottle_bw = ntohl(cp->bottle_bw); 4414 on_queue = ntohl(cp->current_onq); 4415 if (bottle_bw && on_queue) { 4416 /* a rwnd report is in here */ 4417 if (bottle_bw > on_queue) 4418 a_rwnd = bottle_bw - on_queue; 4419 else 4420 a_rwnd = 0; 4421 4422 if (a_rwnd == 0) 4423 stcb->asoc.peers_rwnd = 0; 4424 else { 4425 if (a_rwnd > stcb->asoc.total_flight) { 4426 stcb->asoc.peers_rwnd = 4427 a_rwnd - stcb->asoc.total_flight; 4428 } else { 4429 stcb->asoc.peers_rwnd = 0; 4430 } 4431 if (stcb->asoc.peers_rwnd < 4432 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4433 /* SWS sender side engages */ 4434 stcb->asoc.peers_rwnd = 0; 4435 } 4436 } 4437 } 4438 } else { 4439 SCTP_STAT_INCR(sctps_pdrpfmbox); 4440 } 4441 4442 /* now middle boxes in sat networks get a cwnd bump */ 4443 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4444 (stcb->asoc.sat_t3_loss_recovery == 0) && 4445 (stcb->asoc.sat_network)) { 4446 /* 4447 * This is debateable but for sat networks it makes sense 4448 * Note if a T3 timer has went off, we will prohibit any 4449 * changes to cwnd until we exit the t3 loss recovery. 4450 */ 4451 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4452 net, cp, &bottle_bw, &on_queue); 4453 } 4454 } 4455 4456 /* 4457 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4458 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4459 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4460 * length of the complete packet outputs: - length: modified to remaining 4461 * length after control processing - netp: modified to new sctp_nets after 4462 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4463 * bad packet,...) otherwise return the tcb for this packet 4464 */ 4465 #ifdef __GNUC__ 4466 __attribute__((noinline)) 4467 #endif 4468 static struct sctp_tcb * 4469 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4470 struct sockaddr *src, struct sockaddr *dst, 4471 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4472 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4473 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4474 uint32_t vrf_id, uint16_t port) 4475 { 4476 struct sctp_association *asoc; 4477 struct mbuf *op_err; 4478 char msg[SCTP_DIAG_INFO_LEN]; 4479 uint32_t vtag_in; 4480 int num_chunks = 0; /* number of control chunks processed */ 4481 uint32_t chk_length; 4482 int ret; 4483 int abort_no_unlock = 0; 4484 int ecne_seen = 0; 4485 4486 /* 4487 * How big should this be, and should it be alloc'd? Lets try the 4488 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4489 * until we get into jumbo grams and such.. 4490 */ 4491 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4492 struct sctp_tcb *locked_tcb = stcb; 4493 int got_auth = 0; 4494 uint32_t auth_offset = 0, auth_len = 0; 4495 int auth_skipped = 0; 4496 int asconf_cnt = 0; 4497 4498 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4499 struct socket *so; 4500 4501 #endif 4502 4503 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4504 iphlen, *offset, length, (void *)stcb); 4505 4506 /* validate chunk header length... */ 4507 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4508 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4509 ntohs(ch->chunk_length)); 4510 if (locked_tcb) { 4511 SCTP_TCB_UNLOCK(locked_tcb); 4512 } 4513 return (NULL); 4514 } 4515 /* 4516 * validate the verification tag 4517 */ 4518 vtag_in = ntohl(sh->v_tag); 4519 4520 if (locked_tcb) { 4521 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4522 } 4523 if (ch->chunk_type == SCTP_INITIATION) { 4524 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4525 ntohs(ch->chunk_length), vtag_in); 4526 if (vtag_in != 0) { 4527 /* protocol error- silently discard... */ 4528 SCTP_STAT_INCR(sctps_badvtag); 4529 if (locked_tcb) { 4530 SCTP_TCB_UNLOCK(locked_tcb); 4531 } 4532 return (NULL); 4533 } 4534 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4535 /* 4536 * If there is no stcb, skip the AUTH chunk and process 4537 * later after a stcb is found (to validate the lookup was 4538 * valid. 4539 */ 4540 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4541 (stcb == NULL) && 4542 (inp->auth_supported == 1)) { 4543 /* save this chunk for later processing */ 4544 auth_skipped = 1; 4545 auth_offset = *offset; 4546 auth_len = ntohs(ch->chunk_length); 4547 4548 /* (temporarily) move past this chunk */ 4549 *offset += SCTP_SIZE32(auth_len); 4550 if (*offset >= length) { 4551 /* no more data left in the mbuf chain */ 4552 *offset = length; 4553 if (locked_tcb) { 4554 SCTP_TCB_UNLOCK(locked_tcb); 4555 } 4556 return (NULL); 4557 } 4558 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4559 sizeof(struct sctp_chunkhdr), chunk_buf); 4560 } 4561 if (ch == NULL) { 4562 /* Help */ 4563 *offset = length; 4564 if (locked_tcb) { 4565 SCTP_TCB_UNLOCK(locked_tcb); 4566 } 4567 return (NULL); 4568 } 4569 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4570 goto process_control_chunks; 4571 } 4572 /* 4573 * first check if it's an ASCONF with an unknown src addr we 4574 * need to look inside to find the association 4575 */ 4576 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4577 struct sctp_chunkhdr *asconf_ch = ch; 4578 uint32_t asconf_offset = 0, asconf_len = 0; 4579 4580 /* inp's refcount may be reduced */ 4581 SCTP_INP_INCR_REF(inp); 4582 4583 asconf_offset = *offset; 4584 do { 4585 asconf_len = ntohs(asconf_ch->chunk_length); 4586 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4587 break; 4588 stcb = sctp_findassociation_ep_asconf(m, 4589 *offset, 4590 dst, 4591 sh, &inp, netp, vrf_id); 4592 if (stcb != NULL) 4593 break; 4594 asconf_offset += SCTP_SIZE32(asconf_len); 4595 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4596 sizeof(struct sctp_chunkhdr), chunk_buf); 4597 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4598 if (stcb == NULL) { 4599 /* 4600 * reduce inp's refcount if not reduced in 4601 * sctp_findassociation_ep_asconf(). 4602 */ 4603 SCTP_INP_DECR_REF(inp); 4604 } else { 4605 locked_tcb = stcb; 4606 } 4607 4608 /* now go back and verify any auth chunk to be sure */ 4609 if (auth_skipped && (stcb != NULL)) { 4610 struct sctp_auth_chunk *auth; 4611 4612 auth = (struct sctp_auth_chunk *) 4613 sctp_m_getptr(m, auth_offset, 4614 auth_len, chunk_buf); 4615 got_auth = 1; 4616 auth_skipped = 0; 4617 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4618 auth_offset)) { 4619 /* auth HMAC failed so dump it */ 4620 *offset = length; 4621 if (locked_tcb) { 4622 SCTP_TCB_UNLOCK(locked_tcb); 4623 } 4624 return (NULL); 4625 } else { 4626 /* remaining chunks are HMAC checked */ 4627 stcb->asoc.authenticated = 1; 4628 } 4629 } 4630 } 4631 if (stcb == NULL) { 4632 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 4633 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4634 msg); 4635 /* no association, so it's out of the blue... */ 4636 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4637 mflowtype, mflowid, inp->fibnum, 4638 vrf_id, port); 4639 *offset = length; 4640 if (locked_tcb) { 4641 SCTP_TCB_UNLOCK(locked_tcb); 4642 } 4643 return (NULL); 4644 } 4645 asoc = &stcb->asoc; 4646 /* ABORT and SHUTDOWN can use either v_tag... */ 4647 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4648 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4649 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4650 /* Take the T-bit always into account. */ 4651 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4652 (vtag_in == asoc->my_vtag)) || 4653 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4654 (vtag_in == asoc->peer_vtag))) { 4655 /* this is valid */ 4656 } else { 4657 /* drop this packet... */ 4658 SCTP_STAT_INCR(sctps_badvtag); 4659 if (locked_tcb) { 4660 SCTP_TCB_UNLOCK(locked_tcb); 4661 } 4662 return (NULL); 4663 } 4664 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4665 if (vtag_in != asoc->my_vtag) { 4666 /* 4667 * this could be a stale SHUTDOWN-ACK or the 4668 * peer never got the SHUTDOWN-COMPLETE and 4669 * is still hung; we have started a new asoc 4670 * but it won't complete until the shutdown 4671 * is completed 4672 */ 4673 if (locked_tcb) { 4674 SCTP_TCB_UNLOCK(locked_tcb); 4675 } 4676 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 4677 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4678 msg); 4679 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4680 sh, inp, op_err, 4681 mflowtype, mflowid, fibnum, 4682 vrf_id, port); 4683 return (NULL); 4684 } 4685 } else { 4686 /* for all other chunks, vtag must match */ 4687 if (vtag_in != asoc->my_vtag) { 4688 /* invalid vtag... */ 4689 SCTPDBG(SCTP_DEBUG_INPUT3, 4690 "invalid vtag: %xh, expect %xh\n", 4691 vtag_in, asoc->my_vtag); 4692 SCTP_STAT_INCR(sctps_badvtag); 4693 if (locked_tcb) { 4694 SCTP_TCB_UNLOCK(locked_tcb); 4695 } 4696 *offset = length; 4697 return (NULL); 4698 } 4699 } 4700 } /* end if !SCTP_COOKIE_ECHO */ 4701 /* 4702 * process all control chunks... 4703 */ 4704 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4705 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4706 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4707 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4708 /* implied cookie-ack.. we must have lost the ack */ 4709 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4710 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4711 stcb->asoc.overall_error_count, 4712 0, 4713 SCTP_FROM_SCTP_INPUT, 4714 __LINE__); 4715 } 4716 stcb->asoc.overall_error_count = 0; 4717 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4718 *netp); 4719 } 4720 process_control_chunks: 4721 while (IS_SCTP_CONTROL(ch)) { 4722 /* validate chunk length */ 4723 chk_length = ntohs(ch->chunk_length); 4724 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4725 ch->chunk_type, chk_length); 4726 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4727 if (chk_length < sizeof(*ch) || 4728 (*offset + (int)chk_length) > length) { 4729 *offset = length; 4730 if (locked_tcb) { 4731 SCTP_TCB_UNLOCK(locked_tcb); 4732 } 4733 return (NULL); 4734 } 4735 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4736 /* 4737 * INIT-ACK only gets the init ack "header" portion only 4738 * because we don't have to process the peer's COOKIE. All 4739 * others get a complete chunk. 4740 */ 4741 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4742 (ch->chunk_type == SCTP_INITIATION)) { 4743 /* get an init-ack chunk */ 4744 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4745 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4746 if (ch == NULL) { 4747 *offset = length; 4748 if (locked_tcb) { 4749 SCTP_TCB_UNLOCK(locked_tcb); 4750 } 4751 return (NULL); 4752 } 4753 } else { 4754 /* For cookies and all other chunks. */ 4755 if (chk_length > sizeof(chunk_buf)) { 4756 /* 4757 * use just the size of the chunk buffer so 4758 * the front part of our chunks fit in 4759 * contiguous space up to the chunk buffer 4760 * size (508 bytes). For chunks that need to 4761 * get more than that they must use the 4762 * sctp_m_getptr() function or other means 4763 * (e.g. know how to parse mbuf chains). 4764 * Cookies do this already. 4765 */ 4766 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4767 (sizeof(chunk_buf) - 4), 4768 chunk_buf); 4769 if (ch == NULL) { 4770 *offset = length; 4771 if (locked_tcb) { 4772 SCTP_TCB_UNLOCK(locked_tcb); 4773 } 4774 return (NULL); 4775 } 4776 } else { 4777 /* We can fit it all */ 4778 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4779 chk_length, chunk_buf); 4780 if (ch == NULL) { 4781 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4782 *offset = length; 4783 if (locked_tcb) { 4784 SCTP_TCB_UNLOCK(locked_tcb); 4785 } 4786 return (NULL); 4787 } 4788 } 4789 } 4790 num_chunks++; 4791 /* Save off the last place we got a control from */ 4792 if (stcb != NULL) { 4793 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4794 /* 4795 * allow last_control to be NULL if 4796 * ASCONF... ASCONF processing will find the 4797 * right net later 4798 */ 4799 if ((netp != NULL) && (*netp != NULL)) 4800 stcb->asoc.last_control_chunk_from = *netp; 4801 } 4802 } 4803 #ifdef SCTP_AUDITING_ENABLED 4804 sctp_audit_log(0xB0, ch->chunk_type); 4805 #endif 4806 4807 /* check to see if this chunk required auth, but isn't */ 4808 if ((stcb != NULL) && 4809 (stcb->asoc.auth_supported == 1) && 4810 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4811 !stcb->asoc.authenticated) { 4812 /* "silently" ignore */ 4813 SCTP_STAT_INCR(sctps_recvauthmissing); 4814 goto next_chunk; 4815 } 4816 switch (ch->chunk_type) { 4817 case SCTP_INITIATION: 4818 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4819 /* The INIT chunk must be the only chunk. */ 4820 if ((num_chunks > 1) || 4821 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4822 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4823 "INIT not the only chunk"); 4824 sctp_abort_association(inp, stcb, m, iphlen, 4825 src, dst, sh, op_err, 4826 mflowtype, mflowid, 4827 vrf_id, port); 4828 *offset = length; 4829 return (NULL); 4830 } 4831 /* Honor our resource limit. */ 4832 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4833 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4834 sctp_abort_association(inp, stcb, m, iphlen, 4835 src, dst, sh, op_err, 4836 mflowtype, mflowid, 4837 vrf_id, port); 4838 *offset = length; 4839 return (NULL); 4840 } 4841 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4842 (struct sctp_init_chunk *)ch, inp, 4843 stcb, &abort_no_unlock, 4844 mflowtype, mflowid, 4845 vrf_id, port); 4846 *offset = length; 4847 if ((!abort_no_unlock) && (locked_tcb)) { 4848 SCTP_TCB_UNLOCK(locked_tcb); 4849 } 4850 return (NULL); 4851 break; 4852 case SCTP_PAD_CHUNK: 4853 break; 4854 case SCTP_INITIATION_ACK: 4855 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4856 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4857 /* We are not interested anymore */ 4858 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4859 ; 4860 } else { 4861 if (locked_tcb != stcb) { 4862 /* Very unlikely */ 4863 SCTP_TCB_UNLOCK(locked_tcb); 4864 } 4865 *offset = length; 4866 if (stcb) { 4867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4868 so = SCTP_INP_SO(inp); 4869 atomic_add_int(&stcb->asoc.refcnt, 1); 4870 SCTP_TCB_UNLOCK(stcb); 4871 SCTP_SOCKET_LOCK(so, 1); 4872 SCTP_TCB_LOCK(stcb); 4873 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4874 #endif 4875 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4876 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4878 SCTP_SOCKET_UNLOCK(so, 1); 4879 #endif 4880 } 4881 return (NULL); 4882 } 4883 } 4884 /* The INIT-ACK chunk must be the only chunk. */ 4885 if ((num_chunks > 1) || 4886 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4887 *offset = length; 4888 if (locked_tcb) { 4889 SCTP_TCB_UNLOCK(locked_tcb); 4890 } 4891 return (NULL); 4892 } 4893 if ((netp) && (*netp)) { 4894 ret = sctp_handle_init_ack(m, iphlen, *offset, 4895 src, dst, sh, 4896 (struct sctp_init_ack_chunk *)ch, 4897 stcb, *netp, 4898 &abort_no_unlock, 4899 mflowtype, mflowid, 4900 vrf_id); 4901 } else { 4902 ret = -1; 4903 } 4904 *offset = length; 4905 if (abort_no_unlock) { 4906 return (NULL); 4907 } 4908 /* 4909 * Special case, I must call the output routine to 4910 * get the cookie echoed 4911 */ 4912 if ((stcb != NULL) && (ret == 0)) { 4913 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4914 } 4915 if (locked_tcb) { 4916 SCTP_TCB_UNLOCK(locked_tcb); 4917 } 4918 return (NULL); 4919 break; 4920 case SCTP_SELECTIVE_ACK: 4921 { 4922 struct sctp_sack_chunk *sack; 4923 int abort_now = 0; 4924 uint32_t a_rwnd, cum_ack; 4925 uint16_t num_seg, num_dup; 4926 uint8_t flags; 4927 int offset_seg, offset_dup; 4928 4929 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4930 SCTP_STAT_INCR(sctps_recvsacks); 4931 if (stcb == NULL) { 4932 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4933 break; 4934 } 4935 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4936 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4937 break; 4938 } 4939 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4940 /*- 4941 * If we have sent a shutdown-ack, we will pay no 4942 * attention to a sack sent in to us since 4943 * we don't care anymore. 4944 */ 4945 break; 4946 } 4947 sack = (struct sctp_sack_chunk *)ch; 4948 flags = ch->chunk_flags; 4949 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4950 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4951 num_dup = ntohs(sack->sack.num_dup_tsns); 4952 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4953 if (sizeof(struct sctp_sack_chunk) + 4954 num_seg * sizeof(struct sctp_gap_ack_block) + 4955 num_dup * sizeof(uint32_t) != chk_length) { 4956 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4957 break; 4958 } 4959 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4960 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4961 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4962 cum_ack, num_seg, a_rwnd); 4963 stcb->asoc.seen_a_sack_this_pkt = 1; 4964 if ((stcb->asoc.pr_sctp_cnt == 0) && 4965 (num_seg == 0) && 4966 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4967 (stcb->asoc.saw_sack_with_frags == 0) && 4968 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4969 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4970 ) { 4971 /* 4972 * We have a SIMPLE sack having no 4973 * prior segments and data on sent 4974 * queue to be acked.. Use the 4975 * faster path sack processing. We 4976 * also allow window update sacks 4977 * with no missing segments to go 4978 * this way too. 4979 */ 4980 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4981 } else { 4982 if (netp && *netp) 4983 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4984 num_seg, 0, num_dup, &abort_now, flags, 4985 cum_ack, a_rwnd, ecne_seen); 4986 } 4987 if (abort_now) { 4988 /* ABORT signal from sack processing */ 4989 *offset = length; 4990 return (NULL); 4991 } 4992 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4993 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4994 (stcb->asoc.stream_queue_cnt == 0)) { 4995 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4996 } 4997 } 4998 break; 4999 /* 5000 * EY - nr_sack: If the received chunk is an 5001 * nr_sack chunk 5002 */ 5003 case SCTP_NR_SELECTIVE_ACK: 5004 { 5005 struct sctp_nr_sack_chunk *nr_sack; 5006 int abort_now = 0; 5007 uint32_t a_rwnd, cum_ack; 5008 uint16_t num_seg, num_nr_seg, num_dup; 5009 uint8_t flags; 5010 int offset_seg, offset_dup; 5011 5012 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5013 SCTP_STAT_INCR(sctps_recvsacks); 5014 if (stcb == NULL) { 5015 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5016 break; 5017 } 5018 if (stcb->asoc.nrsack_supported == 0) { 5019 goto unknown_chunk; 5020 } 5021 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5022 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5023 break; 5024 } 5025 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5026 /*- 5027 * If we have sent a shutdown-ack, we will pay no 5028 * attention to a sack sent in to us since 5029 * we don't care anymore. 5030 */ 5031 break; 5032 } 5033 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5034 flags = ch->chunk_flags; 5035 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5036 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5037 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5038 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5039 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5040 if (sizeof(struct sctp_nr_sack_chunk) + 5041 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5042 num_dup * sizeof(uint32_t) != chk_length) { 5043 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5044 break; 5045 } 5046 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5047 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5049 cum_ack, num_seg, a_rwnd); 5050 stcb->asoc.seen_a_sack_this_pkt = 1; 5051 if ((stcb->asoc.pr_sctp_cnt == 0) && 5052 (num_seg == 0) && (num_nr_seg == 0) && 5053 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5054 (stcb->asoc.saw_sack_with_frags == 0) && 5055 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5056 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5057 /* 5058 * We have a SIMPLE sack having no 5059 * prior segments and data on sent 5060 * queue to be acked. Use the faster 5061 * path sack processing. We also 5062 * allow window update sacks with no 5063 * missing segments to go this way 5064 * too. 5065 */ 5066 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5067 &abort_now, ecne_seen); 5068 } else { 5069 if (netp && *netp) 5070 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5071 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5072 cum_ack, a_rwnd, ecne_seen); 5073 } 5074 if (abort_now) { 5075 /* ABORT signal from sack processing */ 5076 *offset = length; 5077 return (NULL); 5078 } 5079 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5080 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5081 (stcb->asoc.stream_queue_cnt == 0)) { 5082 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5083 } 5084 } 5085 break; 5086 5087 case SCTP_HEARTBEAT_REQUEST: 5088 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5089 if ((stcb) && netp && *netp) { 5090 SCTP_STAT_INCR(sctps_recvheartbeat); 5091 sctp_send_heartbeat_ack(stcb, m, *offset, 5092 chk_length, *netp); 5093 5094 /* He's alive so give him credit */ 5095 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5096 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5097 stcb->asoc.overall_error_count, 5098 0, 5099 SCTP_FROM_SCTP_INPUT, 5100 __LINE__); 5101 } 5102 stcb->asoc.overall_error_count = 0; 5103 } 5104 break; 5105 case SCTP_HEARTBEAT_ACK: 5106 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5107 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5108 /* Its not ours */ 5109 *offset = length; 5110 if (locked_tcb) { 5111 SCTP_TCB_UNLOCK(locked_tcb); 5112 } 5113 return (NULL); 5114 } 5115 /* He's alive so give him credit */ 5116 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5117 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5118 stcb->asoc.overall_error_count, 5119 0, 5120 SCTP_FROM_SCTP_INPUT, 5121 __LINE__); 5122 } 5123 stcb->asoc.overall_error_count = 0; 5124 SCTP_STAT_INCR(sctps_recvheartbeatack); 5125 if (netp && *netp) 5126 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5127 stcb, *netp); 5128 break; 5129 case SCTP_ABORT_ASSOCIATION: 5130 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5131 (void *)stcb); 5132 if ((stcb) && netp && *netp) 5133 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5134 stcb, *netp); 5135 *offset = length; 5136 return (NULL); 5137 break; 5138 case SCTP_SHUTDOWN: 5139 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5140 (void *)stcb); 5141 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5142 *offset = length; 5143 if (locked_tcb) { 5144 SCTP_TCB_UNLOCK(locked_tcb); 5145 } 5146 return (NULL); 5147 } 5148 if (netp && *netp) { 5149 int abort_flag = 0; 5150 5151 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5152 stcb, *netp, &abort_flag); 5153 if (abort_flag) { 5154 *offset = length; 5155 return (NULL); 5156 } 5157 } 5158 break; 5159 case SCTP_SHUTDOWN_ACK: 5160 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5161 if ((stcb) && (netp) && (*netp)) 5162 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5163 *offset = length; 5164 return (NULL); 5165 break; 5166 5167 case SCTP_OPERATION_ERROR: 5168 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5169 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5170 *offset = length; 5171 return (NULL); 5172 } 5173 break; 5174 case SCTP_COOKIE_ECHO: 5175 SCTPDBG(SCTP_DEBUG_INPUT3, 5176 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5177 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5178 ; 5179 } else { 5180 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5181 /* We are not interested anymore */ 5182 abend: 5183 if (stcb) { 5184 SCTP_TCB_UNLOCK(stcb); 5185 } 5186 *offset = length; 5187 return (NULL); 5188 } 5189 } 5190 /* 5191 * First are we accepting? We do this again here 5192 * since it is possible that a previous endpoint WAS 5193 * listening responded to a INIT-ACK and then 5194 * closed. We opened and bound.. and are now no 5195 * longer listening. 5196 */ 5197 5198 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5199 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5200 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5201 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5202 sctp_abort_association(inp, stcb, m, iphlen, 5203 src, dst, sh, op_err, 5204 mflowtype, mflowid, 5205 vrf_id, port); 5206 } 5207 *offset = length; 5208 return (NULL); 5209 } else { 5210 struct mbuf *ret_buf; 5211 struct sctp_inpcb *linp; 5212 5213 if (stcb) { 5214 linp = NULL; 5215 } else { 5216 linp = inp; 5217 } 5218 5219 if (linp) { 5220 SCTP_ASOC_CREATE_LOCK(linp); 5221 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5222 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5223 SCTP_ASOC_CREATE_UNLOCK(linp); 5224 goto abend; 5225 } 5226 } 5227 if (netp) { 5228 ret_buf = 5229 sctp_handle_cookie_echo(m, iphlen, 5230 *offset, 5231 src, dst, 5232 sh, 5233 (struct sctp_cookie_echo_chunk *)ch, 5234 &inp, &stcb, netp, 5235 auth_skipped, 5236 auth_offset, 5237 auth_len, 5238 &locked_tcb, 5239 mflowtype, 5240 mflowid, 5241 vrf_id, 5242 port); 5243 } else { 5244 ret_buf = NULL; 5245 } 5246 if (linp) { 5247 SCTP_ASOC_CREATE_UNLOCK(linp); 5248 } 5249 if (ret_buf == NULL) { 5250 if (locked_tcb) { 5251 SCTP_TCB_UNLOCK(locked_tcb); 5252 } 5253 SCTPDBG(SCTP_DEBUG_INPUT3, 5254 "GAK, null buffer\n"); 5255 *offset = length; 5256 return (NULL); 5257 } 5258 /* if AUTH skipped, see if it verified... */ 5259 if (auth_skipped) { 5260 got_auth = 1; 5261 auth_skipped = 0; 5262 } 5263 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5264 /* 5265 * Restart the timer if we have 5266 * pending data 5267 */ 5268 struct sctp_tmit_chunk *chk; 5269 5270 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5271 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5272 } 5273 } 5274 break; 5275 case SCTP_COOKIE_ACK: 5276 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5277 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5278 if (locked_tcb) { 5279 SCTP_TCB_UNLOCK(locked_tcb); 5280 } 5281 return (NULL); 5282 } 5283 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5284 /* We are not interested anymore */ 5285 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5286 ; 5287 } else if (stcb) { 5288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5289 so = SCTP_INP_SO(inp); 5290 atomic_add_int(&stcb->asoc.refcnt, 1); 5291 SCTP_TCB_UNLOCK(stcb); 5292 SCTP_SOCKET_LOCK(so, 1); 5293 SCTP_TCB_LOCK(stcb); 5294 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5295 #endif 5296 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5297 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5299 SCTP_SOCKET_UNLOCK(so, 1); 5300 #endif 5301 *offset = length; 5302 return (NULL); 5303 } 5304 } 5305 /* He's alive so give him credit */ 5306 if ((stcb) && netp && *netp) { 5307 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5308 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5309 stcb->asoc.overall_error_count, 5310 0, 5311 SCTP_FROM_SCTP_INPUT, 5312 __LINE__); 5313 } 5314 stcb->asoc.overall_error_count = 0; 5315 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5316 } 5317 break; 5318 case SCTP_ECN_ECHO: 5319 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5320 /* He's alive so give him credit */ 5321 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5322 /* Its not ours */ 5323 if (locked_tcb) { 5324 SCTP_TCB_UNLOCK(locked_tcb); 5325 } 5326 *offset = length; 5327 return (NULL); 5328 } 5329 if (stcb) { 5330 if (stcb->asoc.ecn_supported == 0) { 5331 goto unknown_chunk; 5332 } 5333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5334 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5335 stcb->asoc.overall_error_count, 5336 0, 5337 SCTP_FROM_SCTP_INPUT, 5338 __LINE__); 5339 } 5340 stcb->asoc.overall_error_count = 0; 5341 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5342 stcb); 5343 ecne_seen = 1; 5344 } 5345 break; 5346 case SCTP_ECN_CWR: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5348 /* He's alive so give him credit */ 5349 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5350 /* Its not ours */ 5351 if (locked_tcb) { 5352 SCTP_TCB_UNLOCK(locked_tcb); 5353 } 5354 *offset = length; 5355 return (NULL); 5356 } 5357 if (stcb) { 5358 if (stcb->asoc.ecn_supported == 0) { 5359 goto unknown_chunk; 5360 } 5361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5362 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5363 stcb->asoc.overall_error_count, 5364 0, 5365 SCTP_FROM_SCTP_INPUT, 5366 __LINE__); 5367 } 5368 stcb->asoc.overall_error_count = 0; 5369 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5370 } 5371 break; 5372 case SCTP_SHUTDOWN_COMPLETE: 5373 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5374 /* must be first and only chunk */ 5375 if ((num_chunks > 1) || 5376 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5377 *offset = length; 5378 if (locked_tcb) { 5379 SCTP_TCB_UNLOCK(locked_tcb); 5380 } 5381 return (NULL); 5382 } 5383 if ((stcb) && netp && *netp) { 5384 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5385 stcb, *netp); 5386 } 5387 *offset = length; 5388 return (NULL); 5389 break; 5390 case SCTP_ASCONF: 5391 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5392 /* He's alive so give him credit */ 5393 if (stcb) { 5394 if (stcb->asoc.asconf_supported == 0) { 5395 goto unknown_chunk; 5396 } 5397 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5398 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5399 stcb->asoc.overall_error_count, 5400 0, 5401 SCTP_FROM_SCTP_INPUT, 5402 __LINE__); 5403 } 5404 stcb->asoc.overall_error_count = 0; 5405 sctp_handle_asconf(m, *offset, src, 5406 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5407 asconf_cnt++; 5408 } 5409 break; 5410 case SCTP_ASCONF_ACK: 5411 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5412 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5413 /* Its not ours */ 5414 if (locked_tcb) { 5415 SCTP_TCB_UNLOCK(locked_tcb); 5416 } 5417 *offset = length; 5418 return (NULL); 5419 } 5420 if ((stcb) && netp && *netp) { 5421 if (stcb->asoc.asconf_supported == 0) { 5422 goto unknown_chunk; 5423 } 5424 /* He's alive so give him credit */ 5425 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5426 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5427 stcb->asoc.overall_error_count, 5428 0, 5429 SCTP_FROM_SCTP_INPUT, 5430 __LINE__); 5431 } 5432 stcb->asoc.overall_error_count = 0; 5433 sctp_handle_asconf_ack(m, *offset, 5434 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5435 if (abort_no_unlock) 5436 return (NULL); 5437 } 5438 break; 5439 case SCTP_FORWARD_CUM_TSN: 5440 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5441 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5442 /* Its not ours */ 5443 if (locked_tcb) { 5444 SCTP_TCB_UNLOCK(locked_tcb); 5445 } 5446 *offset = length; 5447 return (NULL); 5448 } 5449 /* He's alive so give him credit */ 5450 if (stcb) { 5451 int abort_flag = 0; 5452 5453 if (stcb->asoc.prsctp_supported == 0) { 5454 goto unknown_chunk; 5455 } 5456 stcb->asoc.overall_error_count = 0; 5457 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5458 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5459 stcb->asoc.overall_error_count, 5460 0, 5461 SCTP_FROM_SCTP_INPUT, 5462 __LINE__); 5463 } 5464 *fwd_tsn_seen = 1; 5465 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5466 /* We are not interested anymore */ 5467 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5468 so = SCTP_INP_SO(inp); 5469 atomic_add_int(&stcb->asoc.refcnt, 1); 5470 SCTP_TCB_UNLOCK(stcb); 5471 SCTP_SOCKET_LOCK(so, 1); 5472 SCTP_TCB_LOCK(stcb); 5473 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5474 #endif 5475 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5476 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5477 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5478 SCTP_SOCKET_UNLOCK(so, 1); 5479 #endif 5480 *offset = length; 5481 return (NULL); 5482 } 5483 sctp_handle_forward_tsn(stcb, 5484 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5485 if (abort_flag) { 5486 *offset = length; 5487 return (NULL); 5488 } else { 5489 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5490 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5491 stcb->asoc.overall_error_count, 5492 0, 5493 SCTP_FROM_SCTP_INPUT, 5494 __LINE__); 5495 } 5496 stcb->asoc.overall_error_count = 0; 5497 } 5498 5499 } 5500 break; 5501 case SCTP_STREAM_RESET: 5502 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5503 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5504 /* Its not ours */ 5505 if (locked_tcb) { 5506 SCTP_TCB_UNLOCK(locked_tcb); 5507 } 5508 *offset = length; 5509 return (NULL); 5510 } 5511 if (stcb->asoc.reconfig_supported == 0) { 5512 goto unknown_chunk; 5513 } 5514 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5515 /* stop processing */ 5516 *offset = length; 5517 return (NULL); 5518 } 5519 break; 5520 case SCTP_PACKET_DROPPED: 5521 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5522 /* re-get it all please */ 5523 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5524 /* Its not ours */ 5525 if (locked_tcb) { 5526 SCTP_TCB_UNLOCK(locked_tcb); 5527 } 5528 *offset = length; 5529 return (NULL); 5530 } 5531 if (ch && (stcb) && netp && (*netp)) { 5532 if (stcb->asoc.pktdrop_supported == 0) { 5533 goto unknown_chunk; 5534 } 5535 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5536 stcb, *netp, 5537 min(chk_length, (sizeof(chunk_buf) - 4))); 5538 5539 } 5540 break; 5541 case SCTP_AUTHENTICATION: 5542 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5543 if (stcb == NULL) { 5544 /* save the first AUTH for later processing */ 5545 if (auth_skipped == 0) { 5546 auth_offset = *offset; 5547 auth_len = chk_length; 5548 auth_skipped = 1; 5549 } 5550 /* skip this chunk (temporarily) */ 5551 goto next_chunk; 5552 } 5553 if (stcb->asoc.auth_supported == 0) { 5554 goto unknown_chunk; 5555 } 5556 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5557 (chk_length > (sizeof(struct sctp_auth_chunk) + 5558 SCTP_AUTH_DIGEST_LEN_MAX))) { 5559 /* Its not ours */ 5560 if (locked_tcb) { 5561 SCTP_TCB_UNLOCK(locked_tcb); 5562 } 5563 *offset = length; 5564 return (NULL); 5565 } 5566 if (got_auth == 1) { 5567 /* skip this chunk... it's already auth'd */ 5568 goto next_chunk; 5569 } 5570 got_auth = 1; 5571 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5572 m, *offset)) { 5573 /* auth HMAC failed so dump the packet */ 5574 *offset = length; 5575 return (stcb); 5576 } else { 5577 /* remaining chunks are HMAC checked */ 5578 stcb->asoc.authenticated = 1; 5579 } 5580 break; 5581 5582 default: 5583 unknown_chunk: 5584 /* it's an unknown chunk! */ 5585 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5586 struct mbuf *mm; 5587 struct sctp_paramhdr *phd; 5588 int len; 5589 5590 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5591 0, M_NOWAIT, 1, MT_DATA); 5592 if (mm) { 5593 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5594 phd = mtod(mm, struct sctp_paramhdr *); 5595 /* 5596 * We cheat and use param type since 5597 * we did not bother to define a 5598 * error cause struct. They are the 5599 * same basic format with different 5600 * names. 5601 */ 5602 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5603 phd->param_length = htons(len + sizeof(*phd)); 5604 SCTP_BUF_LEN(mm) = sizeof(*phd); 5605 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5606 if (SCTP_BUF_NEXT(mm)) { 5607 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5608 sctp_m_freem(mm); 5609 } else { 5610 #ifdef SCTP_MBUF_LOGGING 5611 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5612 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5613 } 5614 #endif 5615 sctp_queue_op_err(stcb, mm); 5616 } 5617 } else { 5618 sctp_m_freem(mm); 5619 } 5620 } 5621 } 5622 if ((ch->chunk_type & 0x80) == 0) { 5623 /* discard this packet */ 5624 *offset = length; 5625 return (stcb); 5626 } /* else skip this bad chunk and continue... */ 5627 break; 5628 } /* switch (ch->chunk_type) */ 5629 5630 5631 next_chunk: 5632 /* get the next chunk */ 5633 *offset += SCTP_SIZE32(chk_length); 5634 if (*offset >= length) { 5635 /* no more data left in the mbuf chain */ 5636 break; 5637 } 5638 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5639 sizeof(struct sctp_chunkhdr), chunk_buf); 5640 if (ch == NULL) { 5641 if (locked_tcb) { 5642 SCTP_TCB_UNLOCK(locked_tcb); 5643 } 5644 *offset = length; 5645 return (NULL); 5646 } 5647 } /* while */ 5648 5649 if (asconf_cnt > 0 && stcb != NULL) { 5650 sctp_send_asconf_ack(stcb); 5651 } 5652 return (stcb); 5653 } 5654 5655 5656 #ifdef INVARIANTS 5657 #ifdef __GNUC__ 5658 __attribute__((noinline)) 5659 #endif 5660 void 5661 sctp_validate_no_locks(struct sctp_inpcb *inp) 5662 { 5663 struct sctp_tcb *lstcb; 5664 5665 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5666 if (mtx_owned(&lstcb->tcb_mtx)) { 5667 panic("Own lock on stcb at return from input"); 5668 } 5669 } 5670 if (mtx_owned(&inp->inp_create_mtx)) { 5671 panic("Own create lock on inp"); 5672 } 5673 if (mtx_owned(&inp->inp_mtx)) { 5674 panic("Own inp lock on inp"); 5675 } 5676 } 5677 5678 #endif 5679 5680 /* 5681 * common input chunk processing (v4 and v6) 5682 */ 5683 void 5684 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5685 struct sockaddr *src, struct sockaddr *dst, 5686 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5687 #if !defined(SCTP_WITH_NO_CSUM) 5688 uint8_t compute_crc, 5689 #endif 5690 uint8_t ecn_bits, 5691 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5692 uint32_t vrf_id, uint16_t port) 5693 { 5694 uint32_t high_tsn; 5695 int fwd_tsn_seen = 0, data_processed = 0; 5696 struct mbuf *m = *mm, *op_err; 5697 char msg[SCTP_DIAG_INFO_LEN]; 5698 int un_sent; 5699 int cnt_ctrl_ready = 0; 5700 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5701 struct sctp_tcb *stcb = NULL; 5702 struct sctp_nets *net = NULL; 5703 5704 SCTP_STAT_INCR(sctps_recvdatagrams); 5705 #ifdef SCTP_AUDITING_ENABLED 5706 sctp_audit_log(0xE0, 1); 5707 sctp_auditing(0, inp, stcb, net); 5708 #endif 5709 #if !defined(SCTP_WITH_NO_CSUM) 5710 if (compute_crc != 0) { 5711 uint32_t check, calc_check; 5712 5713 check = sh->checksum; 5714 sh->checksum = 0; 5715 calc_check = sctp_calculate_cksum(m, iphlen); 5716 sh->checksum = check; 5717 if (calc_check != check) { 5718 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5719 calc_check, check, (void *)m, length, iphlen); 5720 stcb = sctp_findassociation_addr(m, offset, src, dst, 5721 sh, ch, &inp, &net, vrf_id); 5722 #if defined(INET) || defined(INET6) 5723 if ((net != NULL) && (port != 0)) { 5724 if (net->port == 0) { 5725 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5726 } 5727 net->port = port; 5728 } 5729 #endif 5730 if (net != NULL) { 5731 net->flowtype = mflowtype; 5732 net->flowid = mflowid; 5733 } 5734 if ((inp != NULL) && (stcb != NULL)) { 5735 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5736 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5737 } else if ((inp != NULL) && (stcb == NULL)) { 5738 inp_decr = inp; 5739 } 5740 SCTP_STAT_INCR(sctps_badsum); 5741 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5742 goto out; 5743 } 5744 } 5745 #endif 5746 /* Destination port of 0 is illegal, based on RFC4960. */ 5747 if (sh->dest_port == 0) { 5748 SCTP_STAT_INCR(sctps_hdrops); 5749 goto out; 5750 } 5751 stcb = sctp_findassociation_addr(m, offset, src, dst, 5752 sh, ch, &inp, &net, vrf_id); 5753 #if defined(INET) || defined(INET6) 5754 if ((net != NULL) && (port != 0)) { 5755 if (net->port == 0) { 5756 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5757 } 5758 net->port = port; 5759 } 5760 #endif 5761 if (net != NULL) { 5762 net->flowtype = mflowtype; 5763 net->flowid = mflowid; 5764 } 5765 if (inp == NULL) { 5766 SCTP_STAT_INCR(sctps_noport); 5767 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5768 goto out; 5769 } 5770 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5771 sctp_send_shutdown_complete2(src, dst, sh, 5772 mflowtype, mflowid, fibnum, 5773 vrf_id, port); 5774 goto out; 5775 } 5776 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5777 goto out; 5778 } 5779 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5780 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5781 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5782 (ch->chunk_type != SCTP_INIT))) { 5783 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5784 "Out of the blue"); 5785 sctp_send_abort(m, iphlen, src, dst, 5786 sh, 0, op_err, 5787 mflowtype, mflowid, fibnum, 5788 vrf_id, port); 5789 } 5790 } 5791 goto out; 5792 } else if (stcb == NULL) { 5793 inp_decr = inp; 5794 } 5795 #ifdef IPSEC 5796 /*- 5797 * I very much doubt any of the IPSEC stuff will work but I have no 5798 * idea, so I will leave it in place. 5799 */ 5800 if (inp != NULL) { 5801 switch (dst->sa_family) { 5802 #ifdef INET 5803 case AF_INET: 5804 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5805 SCTP_STAT_INCR(sctps_hdrops); 5806 goto out; 5807 } 5808 break; 5809 #endif 5810 #ifdef INET6 5811 case AF_INET6: 5812 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5813 SCTP_STAT_INCR(sctps_hdrops); 5814 goto out; 5815 } 5816 break; 5817 #endif 5818 default: 5819 break; 5820 } 5821 } 5822 #endif 5823 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5824 (void *)m, iphlen, offset, length, (void *)stcb); 5825 if (stcb) { 5826 /* always clear this before beginning a packet */ 5827 stcb->asoc.authenticated = 0; 5828 stcb->asoc.seen_a_sack_this_pkt = 0; 5829 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5830 (void *)stcb, stcb->asoc.state); 5831 5832 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5833 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5834 /*- 5835 * If we hit here, we had a ref count 5836 * up when the assoc was aborted and the 5837 * timer is clearing out the assoc, we should 5838 * NOT respond to any packet.. its OOTB. 5839 */ 5840 SCTP_TCB_UNLOCK(stcb); 5841 stcb = NULL; 5842 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5843 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5844 msg); 5845 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5846 mflowtype, mflowid, inp->fibnum, 5847 vrf_id, port); 5848 goto out; 5849 } 5850 } 5851 if (IS_SCTP_CONTROL(ch)) { 5852 /* process the control portion of the SCTP packet */ 5853 /* sa_ignore NO_NULL_CHK */ 5854 stcb = sctp_process_control(m, iphlen, &offset, length, 5855 src, dst, sh, ch, 5856 inp, stcb, &net, &fwd_tsn_seen, 5857 mflowtype, mflowid, fibnum, 5858 vrf_id, port); 5859 if (stcb) { 5860 /* 5861 * This covers us if the cookie-echo was there and 5862 * it changes our INP. 5863 */ 5864 inp = stcb->sctp_ep; 5865 #if defined(INET) || defined(INET6) 5866 if ((net) && (port)) { 5867 if (net->port == 0) { 5868 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5869 } 5870 net->port = port; 5871 } 5872 #endif 5873 } 5874 } else { 5875 /* 5876 * no control chunks, so pre-process DATA chunks (these 5877 * checks are taken care of by control processing) 5878 */ 5879 5880 /* 5881 * if DATA only packet, and auth is required, then punt... 5882 * can't have authenticated without any AUTH (control) 5883 * chunks 5884 */ 5885 if ((stcb != NULL) && 5886 (stcb->asoc.auth_supported == 1) && 5887 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5888 /* "silently" ignore */ 5889 SCTP_STAT_INCR(sctps_recvauthmissing); 5890 goto out; 5891 } 5892 if (stcb == NULL) { 5893 /* out of the blue DATA chunk */ 5894 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5895 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5896 msg); 5897 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5898 mflowtype, mflowid, fibnum, 5899 vrf_id, port); 5900 goto out; 5901 } 5902 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5903 /* v_tag mismatch! */ 5904 SCTP_STAT_INCR(sctps_badvtag); 5905 goto out; 5906 } 5907 } 5908 5909 if (stcb == NULL) { 5910 /* 5911 * no valid TCB for this packet, or we found it's a bad 5912 * packet while processing control, or we're done with this 5913 * packet (done or skip rest of data), so we drop it... 5914 */ 5915 goto out; 5916 } 5917 /* 5918 * DATA chunk processing 5919 */ 5920 /* plow through the data chunks while length > offset */ 5921 5922 /* 5923 * Rest should be DATA only. Check authentication state if AUTH for 5924 * DATA is required. 5925 */ 5926 if ((length > offset) && 5927 (stcb != NULL) && 5928 (stcb->asoc.auth_supported == 1) && 5929 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5930 !stcb->asoc.authenticated) { 5931 /* "silently" ignore */ 5932 SCTP_STAT_INCR(sctps_recvauthmissing); 5933 SCTPDBG(SCTP_DEBUG_AUTH1, 5934 "Data chunk requires AUTH, skipped\n"); 5935 goto trigger_send; 5936 } 5937 if (length > offset) { 5938 int retval; 5939 5940 /* 5941 * First check to make sure our state is correct. We would 5942 * not get here unless we really did have a tag, so we don't 5943 * abort if this happens, just dump the chunk silently. 5944 */ 5945 switch (SCTP_GET_STATE(&stcb->asoc)) { 5946 case SCTP_STATE_COOKIE_ECHOED: 5947 /* 5948 * we consider data with valid tags in this state 5949 * shows us the cookie-ack was lost. Imply it was 5950 * there. 5951 */ 5952 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5953 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5954 stcb->asoc.overall_error_count, 5955 0, 5956 SCTP_FROM_SCTP_INPUT, 5957 __LINE__); 5958 } 5959 stcb->asoc.overall_error_count = 0; 5960 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5961 break; 5962 case SCTP_STATE_COOKIE_WAIT: 5963 /* 5964 * We consider OOTB any data sent during asoc setup. 5965 */ 5966 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5967 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5968 msg); 5969 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5970 mflowtype, mflowid, inp->fibnum, 5971 vrf_id, port); 5972 goto out; 5973 /* sa_ignore NOTREACHED */ 5974 break; 5975 case SCTP_STATE_EMPTY: /* should not happen */ 5976 case SCTP_STATE_INUSE: /* should not happen */ 5977 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5978 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5979 default: 5980 goto out; 5981 /* sa_ignore NOTREACHED */ 5982 break; 5983 case SCTP_STATE_OPEN: 5984 case SCTP_STATE_SHUTDOWN_SENT: 5985 break; 5986 } 5987 /* plow through the data chunks while length > offset */ 5988 retval = sctp_process_data(mm, iphlen, &offset, length, 5989 inp, stcb, net, &high_tsn); 5990 if (retval == 2) { 5991 /* 5992 * The association aborted, NO UNLOCK needed since 5993 * the association is destroyed. 5994 */ 5995 stcb = NULL; 5996 goto out; 5997 } 5998 data_processed = 1; 5999 /* 6000 * Anything important needs to have been m_copy'ed in 6001 * process_data 6002 */ 6003 } 6004 /* take care of ecn */ 6005 if ((data_processed == 1) && 6006 (stcb->asoc.ecn_supported == 1) && 6007 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6008 /* Yep, we need to add a ECNE */ 6009 sctp_send_ecn_echo(stcb, net, high_tsn); 6010 } 6011 if ((data_processed == 0) && (fwd_tsn_seen)) { 6012 int was_a_gap; 6013 uint32_t highest_tsn; 6014 6015 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6016 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6017 } else { 6018 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6019 } 6020 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6021 stcb->asoc.send_sack = 1; 6022 sctp_sack_check(stcb, was_a_gap); 6023 } else if (fwd_tsn_seen) { 6024 stcb->asoc.send_sack = 1; 6025 } 6026 /* trigger send of any chunks in queue... */ 6027 trigger_send: 6028 #ifdef SCTP_AUDITING_ENABLED 6029 sctp_audit_log(0xE0, 2); 6030 sctp_auditing(1, inp, stcb, net); 6031 #endif 6032 SCTPDBG(SCTP_DEBUG_INPUT1, 6033 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6034 stcb->asoc.peers_rwnd, 6035 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6036 stcb->asoc.total_flight); 6037 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6038 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6039 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6040 } 6041 if (cnt_ctrl_ready || 6042 ((un_sent) && 6043 (stcb->asoc.peers_rwnd > 0 || 6044 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6045 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6046 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6047 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6048 } 6049 #ifdef SCTP_AUDITING_ENABLED 6050 sctp_audit_log(0xE0, 3); 6051 sctp_auditing(2, inp, stcb, net); 6052 #endif 6053 out: 6054 if (stcb != NULL) { 6055 SCTP_TCB_UNLOCK(stcb); 6056 } 6057 if (inp_decr != NULL) { 6058 /* reduce ref-count */ 6059 SCTP_INP_WLOCK(inp_decr); 6060 SCTP_INP_DECR_REF(inp_decr); 6061 SCTP_INP_WUNLOCK(inp_decr); 6062 } 6063 #ifdef INVARIANTS 6064 if (inp != NULL) { 6065 sctp_validate_no_locks(inp); 6066 } 6067 #endif 6068 return; 6069 } 6070 6071 #ifdef INET 6072 void 6073 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6074 { 6075 struct mbuf *m; 6076 int iphlen; 6077 uint32_t vrf_id = 0; 6078 uint8_t ecn_bits; 6079 struct sockaddr_in src, dst; 6080 struct ip *ip; 6081 struct sctphdr *sh; 6082 struct sctp_chunkhdr *ch; 6083 int length, offset; 6084 6085 #if !defined(SCTP_WITH_NO_CSUM) 6086 uint8_t compute_crc; 6087 6088 #endif 6089 uint32_t mflowid; 6090 uint8_t mflowtype; 6091 uint16_t fibnum; 6092 6093 iphlen = off; 6094 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6095 SCTP_RELEASE_PKT(i_pak); 6096 return; 6097 } 6098 m = SCTP_HEADER_TO_CHAIN(i_pak); 6099 #ifdef SCTP_MBUF_LOGGING 6100 /* Log in any input mbufs */ 6101 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6102 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6103 } 6104 #endif 6105 #ifdef SCTP_PACKET_LOGGING 6106 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6107 sctp_packet_log(m); 6108 } 6109 #endif 6110 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6111 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6112 m->m_pkthdr.len, 6113 if_name(m->m_pkthdr.rcvif), 6114 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6115 mflowid = m->m_pkthdr.flowid; 6116 mflowtype = M_HASHTYPE_GET(m); 6117 fibnum = M_GETFIB(m); 6118 SCTP_STAT_INCR(sctps_recvpackets); 6119 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6120 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6121 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6122 if (SCTP_BUF_LEN(m) < offset) { 6123 if ((m = m_pullup(m, offset)) == NULL) { 6124 SCTP_STAT_INCR(sctps_hdrops); 6125 return; 6126 } 6127 } 6128 ip = mtod(m, struct ip *); 6129 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6130 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6131 offset -= sizeof(struct sctp_chunkhdr); 6132 memset(&src, 0, sizeof(struct sockaddr_in)); 6133 src.sin_family = AF_INET; 6134 src.sin_len = sizeof(struct sockaddr_in); 6135 src.sin_port = sh->src_port; 6136 src.sin_addr = ip->ip_src; 6137 memset(&dst, 0, sizeof(struct sockaddr_in)); 6138 dst.sin_family = AF_INET; 6139 dst.sin_len = sizeof(struct sockaddr_in); 6140 dst.sin_port = sh->dest_port; 6141 dst.sin_addr = ip->ip_dst; 6142 length = ntohs(ip->ip_len); 6143 /* Validate mbuf chain length with IP payload length. */ 6144 if (SCTP_HEADER_LEN(m) != length) { 6145 SCTPDBG(SCTP_DEBUG_INPUT1, 6146 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6147 SCTP_STAT_INCR(sctps_hdrops); 6148 goto out; 6149 } 6150 /* SCTP does not allow broadcasts or multicasts */ 6151 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6152 goto out; 6153 } 6154 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6155 goto out; 6156 } 6157 ecn_bits = ip->ip_tos; 6158 #if defined(SCTP_WITH_NO_CSUM) 6159 SCTP_STAT_INCR(sctps_recvnocrc); 6160 #else 6161 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6162 SCTP_STAT_INCR(sctps_recvhwcrc); 6163 compute_crc = 0; 6164 } else { 6165 SCTP_STAT_INCR(sctps_recvswcrc); 6166 compute_crc = 1; 6167 } 6168 #endif 6169 sctp_common_input_processing(&m, iphlen, offset, length, 6170 (struct sockaddr *)&src, 6171 (struct sockaddr *)&dst, 6172 sh, ch, 6173 #if !defined(SCTP_WITH_NO_CSUM) 6174 compute_crc, 6175 #endif 6176 ecn_bits, 6177 mflowtype, mflowid, fibnum, 6178 vrf_id, port); 6179 out: 6180 if (m) { 6181 sctp_m_freem(m); 6182 } 6183 return; 6184 } 6185 6186 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6187 extern int *sctp_cpuarry; 6188 6189 #endif 6190 6191 int 6192 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6193 { 6194 struct mbuf *m; 6195 int off; 6196 6197 m = *mp; 6198 off = *offp; 6199 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6200 if (mp_ncpus > 1) { 6201 struct ip *ip; 6202 struct sctphdr *sh; 6203 int offset; 6204 int cpu_to_use; 6205 uint32_t flowid, tag; 6206 6207 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6208 flowid = m->m_pkthdr.flowid; 6209 } else { 6210 /* 6211 * No flow id built by lower layers fix it so we 6212 * create one. 6213 */ 6214 offset = off + sizeof(struct sctphdr); 6215 if (SCTP_BUF_LEN(m) < offset) { 6216 if ((m = m_pullup(m, offset)) == NULL) { 6217 SCTP_STAT_INCR(sctps_hdrops); 6218 return (IPPROTO_DONE); 6219 } 6220 } 6221 ip = mtod(m, struct ip *); 6222 sh = (struct sctphdr *)((caddr_t)ip + off); 6223 tag = htonl(sh->v_tag); 6224 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6225 m->m_pkthdr.flowid = flowid; 6226 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6227 } 6228 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6229 sctp_queue_to_mcore(m, off, cpu_to_use); 6230 return (IPPROTO_DONE); 6231 } 6232 #endif 6233 sctp_input_with_port(m, off, 0); 6234 return (IPPROTO_DONE); 6235 } 6236 6237 #endif 6238