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 use_mflowid, 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 use_mflowid, 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 use_mflowid, 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 use_mflowid, 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 use_mflowid, 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 use_mflowid, 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 use_mflowid, 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 use_mflowid, mflowid, 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 use_mflowid, 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 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427 } 428 429 /* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432 static int 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t use_mflowid, uint32_t mflowid, 438 uint32_t vrf_id) 439 { 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 use_mflowid, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->asconf_supported == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 use_mflowid, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559 } 560 561 static void 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564 { 565 union sctp_sockstore store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficent if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 old_error_counter = r_net->error_count; 640 r_net->error_count = 0; 641 r_net->hb_responded = 1; 642 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 643 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 644 /* Now lets do a RTO with this */ 645 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 646 SCTP_RTT_FROM_NON_DATA); 647 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 648 r_net->dest_state |= SCTP_ADDR_REACHABLE; 649 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 650 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 651 } 652 if (r_net->dest_state & SCTP_ADDR_PF) { 653 r_net->dest_state &= ~SCTP_ADDR_PF; 654 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 655 } 656 if (old_error_counter > 0) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691 } 692 693 static int 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695 { 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 703 /* generate a new vtag and send init */ 704 LIST_REMOVE(stcb, sctp_asocs); 705 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 706 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 707 /* 708 * put it in the bucket in the vtag hash of assoc's for the 709 * system 710 */ 711 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 712 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 713 return (1); 714 } 715 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 716 /* 717 * treat like a case where the cookie expired i.e.: - dump 718 * current cookie. - generate a new vtag. - resend init. 719 */ 720 /* generate a new vtag and send init */ 721 LIST_REMOVE(stcb, sctp_asocs); 722 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 723 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 724 sctp_stop_all_cookie_timers(stcb); 725 sctp_toss_old_cookies(stcb, &stcb->asoc); 726 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 727 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 728 /* 729 * put it in the bucket in the vtag hash of assoc's for the 730 * system 731 */ 732 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 733 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 734 return (1); 735 } 736 return (0); 737 } 738 739 static int 740 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 741 struct sctp_nets *net) 742 { 743 /* 744 * return 0 means we want you to proceed with the abort non-zero 745 * means no abort processing 746 */ 747 if (stcb->asoc.auth_supported == 0) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 749 return (0); 750 } 751 sctp_asconf_send_nat_state_update(stcb, net); 752 return (1); 753 } 754 755 756 static void 757 sctp_handle_abort(struct sctp_abort_chunk *abort, 758 struct sctp_tcb *stcb, struct sctp_nets *net) 759 { 760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 761 struct socket *so; 762 763 #endif 764 uint16_t len; 765 uint16_t error; 766 767 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 768 if (stcb == NULL) 769 return; 770 771 len = ntohs(abort->ch.chunk_length); 772 if (len > sizeof(struct sctp_chunkhdr)) { 773 /* 774 * Need to check the cause codes for our two magic nat 775 * aborts which don't kill the assoc necessarily. 776 */ 777 struct sctp_missing_nat_state *natc; 778 779 natc = (struct sctp_missing_nat_state *)(abort + 1); 780 error = ntohs(natc->cause); 781 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 782 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 783 abort->ch.chunk_flags); 784 if (sctp_handle_nat_colliding_state(stcb)) { 785 return; 786 } 787 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 788 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 789 abort->ch.chunk_flags); 790 if (sctp_handle_nat_missing_state(stcb, net)) { 791 return; 792 } 793 } 794 } else { 795 error = 0; 796 } 797 /* stop any receive timers */ 798 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 799 /* notify user of the abort and clean up... */ 800 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 801 /* free the tcb */ 802 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 803 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 804 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 806 } 807 #ifdef SCTP_ASOCLOG_OF_TSNS 808 sctp_print_out_track_log(stcb); 809 #endif 810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 811 so = SCTP_INP_SO(stcb->sctp_ep); 812 atomic_add_int(&stcb->asoc.refcnt, 1); 813 SCTP_TCB_UNLOCK(stcb); 814 SCTP_SOCKET_LOCK(so, 1); 815 SCTP_TCB_LOCK(stcb); 816 atomic_subtract_int(&stcb->asoc.refcnt, 1); 817 #endif 818 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 819 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 SCTP_SOCKET_UNLOCK(so, 1); 823 #endif 824 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 825 } 826 827 static void 828 sctp_start_net_timers(struct sctp_tcb *stcb) 829 { 830 uint32_t cnt_hb_sent; 831 struct sctp_nets *net; 832 833 cnt_hb_sent = 0; 834 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 835 /* 836 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 837 * If the dest in unconfirmed send a hb as well if under 838 * max_hb_burst have been sent. 839 */ 840 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 841 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 842 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 843 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 844 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 845 cnt_hb_sent++; 846 } 847 } 848 if (cnt_hb_sent) { 849 sctp_chunk_output(stcb->sctp_ep, stcb, 850 SCTP_OUTPUT_FROM_COOKIE_ACK, 851 SCTP_SO_NOT_LOCKED); 852 } 853 } 854 855 856 static void 857 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 858 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 859 { 860 struct sctp_association *asoc; 861 int some_on_streamwheel; 862 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866 #endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } else { 881 sctp_update_acked(stcb, cp, abort_flag); 882 if (*abort_flag) { 883 return; 884 } 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 asoc->control_pdapi->end_added = 1; 892 asoc->control_pdapi->pdapi_aborted = 1; 893 asoc->control_pdapi = NULL; 894 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 so = SCTP_INP_SO(stcb->sctp_ep); 897 atomic_add_int(&stcb->asoc.refcnt, 1); 898 SCTP_TCB_UNLOCK(stcb); 899 SCTP_SOCKET_LOCK(so, 1); 900 SCTP_TCB_LOCK(stcb); 901 atomic_subtract_int(&stcb->asoc.refcnt, 1); 902 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 903 /* assoc was freed while we were unlocked */ 904 SCTP_SOCKET_UNLOCK(so, 1); 905 return; 906 } 907 #endif 908 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 910 SCTP_SOCKET_UNLOCK(so, 1); 911 #endif 912 } 913 /* goto SHUTDOWN_RECEIVED state to block new requests */ 914 if (stcb->sctp_socket) { 915 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 916 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 917 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 918 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 919 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 920 /* 921 * notify upper layer that peer has initiated a 922 * shutdown 923 */ 924 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 925 926 /* reset time */ 927 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 928 } 929 } 930 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 931 /* 932 * stop the shutdown timer, since we WILL move to 933 * SHUTDOWN-ACK-SENT. 934 */ 935 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 936 } 937 /* Now is there unsent data on a stream somewhere? */ 938 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 939 940 if (!TAILQ_EMPTY(&asoc->send_queue) || 941 !TAILQ_EMPTY(&asoc->sent_queue) || 942 some_on_streamwheel) { 943 /* By returning we will push more data out */ 944 return; 945 } else { 946 /* no outstanding data to send, so move on... */ 947 /* send SHUTDOWN-ACK */ 948 /* move to SHUTDOWN-ACK-SENT state */ 949 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 950 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 951 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 952 } 953 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 954 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 955 sctp_stop_timers_for_shutdown(stcb); 956 sctp_send_shutdown_ack(stcb, net); 957 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 958 stcb, net); 959 } 960 } 961 962 static void 963 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 964 struct sctp_tcb *stcb, 965 struct sctp_nets *net) 966 { 967 struct sctp_association *asoc; 968 969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 970 struct socket *so; 971 972 so = SCTP_INP_SO(stcb->sctp_ep); 973 #endif 974 SCTPDBG(SCTP_DEBUG_INPUT2, 975 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 976 if (stcb == NULL) 977 return; 978 979 asoc = &stcb->asoc; 980 /* process according to association state */ 981 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 982 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 983 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 984 sctp_send_shutdown_complete(stcb, net, 1); 985 SCTP_TCB_UNLOCK(stcb); 986 return; 987 } 988 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 989 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 990 /* unexpected SHUTDOWN-ACK... so ignore... */ 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if (asoc->control_pdapi) { 995 /* 996 * With a normal shutdown we assume the end of last record. 997 */ 998 SCTP_INP_READ_LOCK(stcb->sctp_ep); 999 asoc->control_pdapi->end_added = 1; 1000 asoc->control_pdapi->pdapi_aborted = 1; 1001 asoc->control_pdapi = NULL; 1002 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1004 atomic_add_int(&stcb->asoc.refcnt, 1); 1005 SCTP_TCB_UNLOCK(stcb); 1006 SCTP_SOCKET_LOCK(so, 1); 1007 SCTP_TCB_LOCK(stcb); 1008 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1009 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1010 /* assoc was freed while we were unlocked */ 1011 SCTP_SOCKET_UNLOCK(so, 1); 1012 return; 1013 } 1014 #endif 1015 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018 #endif 1019 } 1020 #ifdef INVARIANTS 1021 if (!TAILQ_EMPTY(&asoc->send_queue) || 1022 !TAILQ_EMPTY(&asoc->sent_queue) || 1023 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1024 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1025 } 1026 #endif 1027 /* stop the timer */ 1028 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1029 /* send SHUTDOWN-COMPLETE */ 1030 sctp_send_shutdown_complete(stcb, net, 0); 1031 /* notify upper layer protocol */ 1032 if (stcb->sctp_socket) { 1033 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1034 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1035 stcb->sctp_socket->so_snd.sb_cc = 0; 1036 } 1037 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1038 } 1039 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1040 /* free the TCB but first save off the ep */ 1041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1042 atomic_add_int(&stcb->asoc.refcnt, 1); 1043 SCTP_TCB_UNLOCK(stcb); 1044 SCTP_SOCKET_LOCK(so, 1); 1045 SCTP_TCB_LOCK(stcb); 1046 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1047 #endif 1048 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1049 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1051 SCTP_SOCKET_UNLOCK(so, 1); 1052 #endif 1053 } 1054 1055 /* 1056 * Skip past the param header and then we will find the chunk that caused the 1057 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1058 * our peer must be broken. 1059 */ 1060 static void 1061 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1062 struct sctp_nets *net) 1063 { 1064 struct sctp_chunkhdr *chk; 1065 1066 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1067 switch (chk->chunk_type) { 1068 case SCTP_ASCONF_ACK: 1069 case SCTP_ASCONF: 1070 sctp_asconf_cleanup(stcb, net); 1071 break; 1072 case SCTP_FORWARD_CUM_TSN: 1073 stcb->asoc.prsctp_supported = 0; 1074 break; 1075 default: 1076 SCTPDBG(SCTP_DEBUG_INPUT2, 1077 "Peer does not support chunk type %d(%x)??\n", 1078 chk->chunk_type, (uint32_t) chk->chunk_type); 1079 break; 1080 } 1081 } 1082 1083 /* 1084 * Skip past the param header and then we will find the param that caused the 1085 * problem. There are a number of param's in a ASCONF OR the prsctp param 1086 * these will turn of specific features. 1087 * XXX: Is this the right thing to do? 1088 */ 1089 static void 1090 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1091 { 1092 struct sctp_paramhdr *pbad; 1093 1094 pbad = phdr + 1; 1095 switch (ntohs(pbad->param_type)) { 1096 /* pr-sctp draft */ 1097 case SCTP_PRSCTP_SUPPORTED: 1098 stcb->asoc.prsctp_supported = 0; 1099 break; 1100 case SCTP_SUPPORTED_CHUNK_EXT: 1101 break; 1102 /* draft-ietf-tsvwg-addip-sctp */ 1103 case SCTP_HAS_NAT_SUPPORT: 1104 stcb->asoc.peer_supports_nat = 0; 1105 break; 1106 case SCTP_ADD_IP_ADDRESS: 1107 case SCTP_DEL_IP_ADDRESS: 1108 case SCTP_SET_PRIM_ADDR: 1109 stcb->asoc.asconf_supported = 0; 1110 break; 1111 case SCTP_SUCCESS_REPORT: 1112 case SCTP_ERROR_CAUSE_IND: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1114 SCTPDBG(SCTP_DEBUG_INPUT2, 1115 "Turning off ASCONF to this strange peer\n"); 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 default: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, 1120 "Peer does not support param type %d(%x)??\n", 1121 pbad->param_type, (uint32_t) pbad->param_type); 1122 break; 1123 } 1124 } 1125 1126 static int 1127 sctp_handle_error(struct sctp_chunkhdr *ch, 1128 struct sctp_tcb *stcb, struct sctp_nets *net) 1129 { 1130 int chklen; 1131 struct sctp_paramhdr *phdr; 1132 uint16_t error, error_type; 1133 uint16_t error_len; 1134 struct sctp_association *asoc; 1135 int adjust; 1136 1137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1138 struct socket *so; 1139 1140 #endif 1141 1142 /* parse through all of the errors and process */ 1143 asoc = &stcb->asoc; 1144 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1145 sizeof(struct sctp_chunkhdr)); 1146 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1147 error = 0; 1148 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1149 /* Process an Error Cause */ 1150 error_type = ntohs(phdr->param_type); 1151 error_len = ntohs(phdr->param_length); 1152 if ((error_len > chklen) || (error_len == 0)) { 1153 /* invalid param length for this param */ 1154 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1155 chklen, error_len); 1156 return (0); 1157 } 1158 if (error == 0) { 1159 /* report the first error cause */ 1160 error = error_type; 1161 } 1162 switch (error_type) { 1163 case SCTP_CAUSE_INVALID_STREAM: 1164 case SCTP_CAUSE_MISSING_PARAM: 1165 case SCTP_CAUSE_INVALID_PARAM: 1166 case SCTP_CAUSE_NO_USER_DATA: 1167 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1168 error_type); 1169 break; 1170 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1171 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1172 ch->chunk_flags); 1173 if (sctp_handle_nat_colliding_state(stcb)) { 1174 return (0); 1175 } 1176 break; 1177 case SCTP_CAUSE_NAT_MISSING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_missing_state(stcb, net)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_STALE_COOKIE: 1185 /* 1186 * We only act if we have echoed a cookie and are 1187 * waiting. 1188 */ 1189 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1190 int *p; 1191 1192 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1193 /* Save the time doubled */ 1194 asoc->cookie_preserve_req = ntohl(*p) << 1; 1195 asoc->stale_cookie_count++; 1196 if (asoc->stale_cookie_count > 1197 asoc->max_init_times) { 1198 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1199 /* now free the asoc */ 1200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1201 so = SCTP_INP_SO(stcb->sctp_ep); 1202 atomic_add_int(&stcb->asoc.refcnt, 1); 1203 SCTP_TCB_UNLOCK(stcb); 1204 SCTP_SOCKET_LOCK(so, 1); 1205 SCTP_TCB_LOCK(stcb); 1206 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1207 #endif 1208 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1209 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 SCTP_SOCKET_UNLOCK(so, 1); 1212 #endif 1213 return (-1); 1214 } 1215 /* blast back to INIT state */ 1216 sctp_toss_old_cookies(stcb, &stcb->asoc); 1217 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1218 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1219 sctp_stop_all_cookie_timers(stcb); 1220 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1221 } 1222 break; 1223 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1224 /* 1225 * Nothing we can do here, we don't do hostname 1226 * addresses so if the peer does not like my IPv6 1227 * (or IPv4 for that matter) it does not matter. If 1228 * they don't support that type of address, they can 1229 * NOT possibly get that packet type... i.e. with no 1230 * IPv6 you can't recieve a IPv6 packet. so we can 1231 * safely ignore this one. If we ever added support 1232 * for HOSTNAME Addresses, then we would need to do 1233 * something here. 1234 */ 1235 break; 1236 case SCTP_CAUSE_UNRECOG_CHUNK: 1237 sctp_process_unrecog_chunk(stcb, phdr, net); 1238 break; 1239 case SCTP_CAUSE_UNRECOG_PARAM: 1240 sctp_process_unrecog_param(stcb, phdr); 1241 break; 1242 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1243 /* 1244 * We ignore this since the timer will drive out a 1245 * new cookie anyway and there timer will drive us 1246 * to send a SHUTDOWN_COMPLETE. We can't send one 1247 * here since we don't have their tag. 1248 */ 1249 break; 1250 case SCTP_CAUSE_DELETING_LAST_ADDR: 1251 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1252 case SCTP_CAUSE_DELETING_SRC_ADDR: 1253 /* 1254 * We should NOT get these here, but in a 1255 * ASCONF-ACK. 1256 */ 1257 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1258 error_type); 1259 break; 1260 case SCTP_CAUSE_OUT_OF_RESC: 1261 /* 1262 * And what, pray tell do we do with the fact that 1263 * the peer is out of resources? Not really sure we 1264 * could do anything but abort. I suspect this 1265 * should have came WITH an abort instead of in a 1266 * OP-ERROR. 1267 */ 1268 break; 1269 default: 1270 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1271 error_type); 1272 break; 1273 } 1274 adjust = SCTP_SIZE32(error_len); 1275 chklen -= adjust; 1276 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1277 } 1278 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1279 return (0); 1280 } 1281 1282 static int 1283 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1284 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1285 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1286 struct sctp_nets *net, int *abort_no_unlock, 1287 uint8_t use_mflowid, uint32_t mflowid, 1288 uint32_t vrf_id) 1289 { 1290 struct sctp_init_ack *init_ack; 1291 struct mbuf *op_err; 1292 1293 SCTPDBG(SCTP_DEBUG_INPUT2, 1294 "sctp_handle_init_ack: handling INIT-ACK\n"); 1295 1296 if (stcb == NULL) { 1297 SCTPDBG(SCTP_DEBUG_INPUT2, 1298 "sctp_handle_init_ack: TCB is null\n"); 1299 return (-1); 1300 } 1301 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1302 /* Invalid length */ 1303 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1304 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1305 src, dst, sh, op_err, 1306 use_mflowid, mflowid, 1307 vrf_id, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 init_ack = &cp->init; 1312 /* validate parameters */ 1313 if (init_ack->initiate_tag == 0) { 1314 /* protocol error... send an abort */ 1315 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1316 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1317 src, dst, sh, op_err, 1318 use_mflowid, mflowid, 1319 vrf_id, net->port); 1320 *abort_no_unlock = 1; 1321 return (-1); 1322 } 1323 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1324 /* protocol error... send an abort */ 1325 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1326 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1327 src, dst, sh, op_err, 1328 use_mflowid, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (init_ack->num_inbound_streams == 0) { 1334 /* protocol error... send an abort */ 1335 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1336 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1337 src, dst, sh, op_err, 1338 use_mflowid, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_outbound_streams == 0) { 1344 /* protocol error... send an abort */ 1345 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1346 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1347 src, dst, sh, op_err, 1348 use_mflowid, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 /* process according to association state... */ 1354 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1355 case SCTP_STATE_COOKIE_WAIT: 1356 /* this is the expected state for this chunk */ 1357 /* process the INIT-ACK parameters */ 1358 if (stcb->asoc.primary_destination->dest_state & 1359 SCTP_ADDR_UNCONFIRMED) { 1360 /* 1361 * The primary is where we sent the INIT, we can 1362 * always consider it confirmed when the INIT-ACK is 1363 * returned. Do this before we load addresses 1364 * though. 1365 */ 1366 stcb->asoc.primary_destination->dest_state &= 1367 ~SCTP_ADDR_UNCONFIRMED; 1368 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1369 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1370 } 1371 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1372 net, abort_no_unlock, 1373 use_mflowid, mflowid, 1374 vrf_id) < 0) { 1375 /* error in parsing parameters */ 1376 return (-1); 1377 } 1378 /* update our state */ 1379 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1380 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1381 1382 /* reset the RTO calc */ 1383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1384 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1385 stcb->asoc.overall_error_count, 1386 0, 1387 SCTP_FROM_SCTP_INPUT, 1388 __LINE__); 1389 } 1390 stcb->asoc.overall_error_count = 0; 1391 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1392 /* 1393 * collapse the init timer back in case of a exponential 1394 * backoff 1395 */ 1396 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1397 stcb, net); 1398 /* 1399 * the send at the end of the inbound data processing will 1400 * cause the cookie to be sent 1401 */ 1402 break; 1403 case SCTP_STATE_SHUTDOWN_SENT: 1404 /* incorrect state... discard */ 1405 break; 1406 case SCTP_STATE_COOKIE_ECHOED: 1407 /* incorrect state... discard */ 1408 break; 1409 case SCTP_STATE_OPEN: 1410 /* incorrect state... discard */ 1411 break; 1412 case SCTP_STATE_EMPTY: 1413 case SCTP_STATE_INUSE: 1414 default: 1415 /* incorrect state... discard */ 1416 return (-1); 1417 break; 1418 } 1419 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1420 return (0); 1421 } 1422 1423 static struct sctp_tcb * 1424 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1425 struct sockaddr *src, struct sockaddr *dst, 1426 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1427 struct sctp_inpcb *inp, struct sctp_nets **netp, 1428 struct sockaddr *init_src, int *notification, 1429 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1430 uint8_t use_mflowid, uint32_t mflowid, 1431 uint32_t vrf_id, uint16_t port); 1432 1433 1434 /* 1435 * handle a state cookie for an existing association m: input packet mbuf 1436 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1437 * "split" mbuf and the cookie signature does not exist offset: offset into 1438 * mbuf to the cookie-echo chunk 1439 */ 1440 static struct sctp_tcb * 1441 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1442 struct sockaddr *src, struct sockaddr *dst, 1443 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1444 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1445 struct sockaddr *init_src, int *notification, 1446 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1447 uint8_t use_mflowid, uint32_t mflowid, 1448 uint32_t vrf_id, uint16_t port) 1449 { 1450 struct sctp_association *asoc; 1451 struct sctp_init_chunk *init_cp, init_buf; 1452 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1453 struct sctp_nets *net; 1454 struct mbuf *op_err; 1455 int init_offset, initack_offset, i; 1456 int retval; 1457 int spec_flag = 0; 1458 uint32_t how_indx; 1459 1460 #if defined(SCTP_DETAILED_STR_STATS) 1461 int j; 1462 1463 #endif 1464 1465 net = *netp; 1466 /* I know that the TCB is non-NULL from the caller */ 1467 asoc = &stcb->asoc; 1468 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1469 if (asoc->cookie_how[how_indx] == 0) 1470 break; 1471 } 1472 if (how_indx < sizeof(asoc->cookie_how)) { 1473 asoc->cookie_how[how_indx] = 1; 1474 } 1475 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1476 /* SHUTDOWN came in after sending INIT-ACK */ 1477 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1479 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1480 use_mflowid, mflowid, 1481 vrf_id, net->port); 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 2; 1484 return (NULL); 1485 } 1486 /* 1487 * find and validate the INIT chunk in the cookie (peer's info) the 1488 * INIT should start after the cookie-echo header struct (chunk 1489 * header, state cookie header struct) 1490 */ 1491 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1492 1493 init_cp = (struct sctp_init_chunk *) 1494 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1495 (uint8_t *) & init_buf); 1496 if (init_cp == NULL) { 1497 /* could not pull a INIT chunk in cookie */ 1498 return (NULL); 1499 } 1500 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1501 return (NULL); 1502 } 1503 /* 1504 * find and validate the INIT-ACK chunk in the cookie (my info) the 1505 * INIT-ACK follows the INIT chunk 1506 */ 1507 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1508 initack_cp = (struct sctp_init_ack_chunk *) 1509 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1510 (uint8_t *) & initack_buf); 1511 if (initack_cp == NULL) { 1512 /* could not pull INIT-ACK chunk in cookie */ 1513 return (NULL); 1514 } 1515 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1516 return (NULL); 1517 } 1518 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1519 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1520 /* 1521 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1522 * to get into the OPEN state 1523 */ 1524 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1525 /*- 1526 * Opps, this means that we somehow generated two vtag's 1527 * the same. I.e. we did: 1528 * Us Peer 1529 * <---INIT(tag=a)------ 1530 * ----INIT-ACK(tag=t)--> 1531 * ----INIT(tag=t)------> *1 1532 * <---INIT-ACK(tag=a)--- 1533 * <----CE(tag=t)------------- *2 1534 * 1535 * At point *1 we should be generating a different 1536 * tag t'. Which means we would throw away the CE and send 1537 * ours instead. Basically this is case C (throw away side). 1538 */ 1539 if (how_indx < sizeof(asoc->cookie_how)) 1540 asoc->cookie_how[how_indx] = 17; 1541 return (NULL); 1542 1543 } 1544 switch (SCTP_GET_STATE(asoc)) { 1545 case SCTP_STATE_COOKIE_WAIT: 1546 case SCTP_STATE_COOKIE_ECHOED: 1547 /* 1548 * INIT was sent but got a COOKIE_ECHO with the 1549 * correct tags... just accept it...but we must 1550 * process the init so that we can make sure we have 1551 * the right seq no's. 1552 */ 1553 /* First we must process the INIT !! */ 1554 retval = sctp_process_init(init_cp, stcb); 1555 if (retval < 0) { 1556 if (how_indx < sizeof(asoc->cookie_how)) 1557 asoc->cookie_how[how_indx] = 3; 1558 return (NULL); 1559 } 1560 /* we have already processed the INIT so no problem */ 1561 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1562 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1563 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1564 /* update current state */ 1565 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1566 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1567 else 1568 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1569 1570 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1571 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1572 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1573 stcb->sctp_ep, stcb, asoc->primary_destination); 1574 } 1575 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1576 sctp_stop_all_cookie_timers(stcb); 1577 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1578 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1579 (inp->sctp_socket->so_qlimit == 0) 1580 ) { 1581 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1582 struct socket *so; 1583 1584 #endif 1585 /* 1586 * Here is where collision would go if we 1587 * did a connect() and instead got a 1588 * init/init-ack/cookie done before the 1589 * init-ack came back.. 1590 */ 1591 stcb->sctp_ep->sctp_flags |= 1592 SCTP_PCB_FLAGS_CONNECTED; 1593 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1594 so = SCTP_INP_SO(stcb->sctp_ep); 1595 atomic_add_int(&stcb->asoc.refcnt, 1); 1596 SCTP_TCB_UNLOCK(stcb); 1597 SCTP_SOCKET_LOCK(so, 1); 1598 SCTP_TCB_LOCK(stcb); 1599 atomic_add_int(&stcb->asoc.refcnt, -1); 1600 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1601 SCTP_SOCKET_UNLOCK(so, 1); 1602 return (NULL); 1603 } 1604 #endif 1605 soisconnected(stcb->sctp_socket); 1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 SCTP_SOCKET_UNLOCK(so, 1); 1608 #endif 1609 } 1610 /* notify upper layer */ 1611 *notification = SCTP_NOTIFY_ASSOC_UP; 1612 /* 1613 * since we did not send a HB make sure we don't 1614 * double things 1615 */ 1616 net->hb_responded = 1; 1617 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1618 &cookie->time_entered, 1619 sctp_align_unsafe_makecopy, 1620 SCTP_RTT_FROM_NON_DATA); 1621 1622 if (stcb->asoc.sctp_autoclose_ticks && 1623 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1624 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1625 inp, stcb, NULL); 1626 } 1627 break; 1628 default: 1629 /* 1630 * we're in the OPEN state (or beyond), so peer must 1631 * have simply lost the COOKIE-ACK 1632 */ 1633 break; 1634 } /* end switch */ 1635 sctp_stop_all_cookie_timers(stcb); 1636 /* 1637 * We ignore the return code here.. not sure if we should 1638 * somehow abort.. but we do have an existing asoc. This 1639 * really should not fail. 1640 */ 1641 if (sctp_load_addresses_from_init(stcb, m, 1642 init_offset + sizeof(struct sctp_init_chunk), 1643 initack_offset, src, dst, init_src)) { 1644 if (how_indx < sizeof(asoc->cookie_how)) 1645 asoc->cookie_how[how_indx] = 4; 1646 return (NULL); 1647 } 1648 /* respond with a COOKIE-ACK */ 1649 sctp_toss_old_cookies(stcb, asoc); 1650 sctp_send_cookie_ack(stcb); 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 5; 1653 return (stcb); 1654 } 1655 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1656 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1657 cookie->tie_tag_my_vtag == 0 && 1658 cookie->tie_tag_peer_vtag == 0) { 1659 /* 1660 * case C in Section 5.2.4 Table 2: XMOO silently discard 1661 */ 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 6; 1664 return (NULL); 1665 } 1666 /* 1667 * If nat support, and the below and stcb is established, send back 1668 * a ABORT(colliding state) if we are established. 1669 */ 1670 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1671 (asoc->peer_supports_nat) && 1672 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1673 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1674 (asoc->peer_vtag == 0)))) { 1675 /* 1676 * Special case - Peer's support nat. We may have two init's 1677 * that we gave out the same tag on since one was not 1678 * established.. i.e. we get INIT from host-1 behind the nat 1679 * and we respond tag-a, we get a INIT from host-2 behind 1680 * the nat and we get tag-a again. Then we bring up host-1 1681 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1682 * Now we have colliding state. We must send an abort here 1683 * with colliding state indication. 1684 */ 1685 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1686 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1687 use_mflowid, mflowid, 1688 vrf_id, port); 1689 return (NULL); 1690 } 1691 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1692 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1693 (asoc->peer_vtag == 0))) { 1694 /* 1695 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1696 * should be ok, re-accept peer info 1697 */ 1698 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1699 /* 1700 * Extension of case C. If we hit this, then the 1701 * random number generator returned the same vtag 1702 * when we first sent our INIT-ACK and when we later 1703 * sent our INIT. The side with the seq numbers that 1704 * are different will be the one that normnally 1705 * would have hit case C. This in effect "extends" 1706 * our vtags in this collision case to be 64 bits. 1707 * The same collision could occur aka you get both 1708 * vtag and seq number the same twice in a row.. but 1709 * is much less likely. If it did happen then we 1710 * would proceed through and bring up the assoc.. we 1711 * may end up with the wrong stream setup however.. 1712 * which would be bad.. but there is no way to 1713 * tell.. until we send on a stream that does not 1714 * exist :-) 1715 */ 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 7; 1718 1719 return (NULL); 1720 } 1721 if (how_indx < sizeof(asoc->cookie_how)) 1722 asoc->cookie_how[how_indx] = 8; 1723 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1724 sctp_stop_all_cookie_timers(stcb); 1725 /* 1726 * since we did not send a HB make sure we don't double 1727 * things 1728 */ 1729 net->hb_responded = 1; 1730 if (stcb->asoc.sctp_autoclose_ticks && 1731 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1732 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1733 NULL); 1734 } 1735 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1736 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1737 1738 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1739 /* 1740 * Ok the peer probably discarded our data (if we 1741 * echoed a cookie+data). So anything on the 1742 * sent_queue should be marked for retransmit, we 1743 * may not get something to kick us so it COULD 1744 * still take a timeout to move these.. but it can't 1745 * hurt to mark them. 1746 */ 1747 struct sctp_tmit_chunk *chk; 1748 1749 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1750 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1751 chk->sent = SCTP_DATAGRAM_RESEND; 1752 sctp_flight_size_decrease(chk); 1753 sctp_total_flight_decrease(stcb, chk); 1754 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1755 spec_flag++; 1756 } 1757 } 1758 1759 } 1760 /* process the INIT info (peer's info) */ 1761 retval = sctp_process_init(init_cp, stcb); 1762 if (retval < 0) { 1763 if (how_indx < sizeof(asoc->cookie_how)) 1764 asoc->cookie_how[how_indx] = 9; 1765 return (NULL); 1766 } 1767 if (sctp_load_addresses_from_init(stcb, m, 1768 init_offset + sizeof(struct sctp_init_chunk), 1769 initack_offset, src, dst, init_src)) { 1770 if (how_indx < sizeof(asoc->cookie_how)) 1771 asoc->cookie_how[how_indx] = 10; 1772 return (NULL); 1773 } 1774 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1775 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1776 *notification = SCTP_NOTIFY_ASSOC_UP; 1777 1778 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1779 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1780 (inp->sctp_socket->so_qlimit == 0)) { 1781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1782 struct socket *so; 1783 1784 #endif 1785 stcb->sctp_ep->sctp_flags |= 1786 SCTP_PCB_FLAGS_CONNECTED; 1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 so = SCTP_INP_SO(stcb->sctp_ep); 1789 atomic_add_int(&stcb->asoc.refcnt, 1); 1790 SCTP_TCB_UNLOCK(stcb); 1791 SCTP_SOCKET_LOCK(so, 1); 1792 SCTP_TCB_LOCK(stcb); 1793 atomic_add_int(&stcb->asoc.refcnt, -1); 1794 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1795 SCTP_SOCKET_UNLOCK(so, 1); 1796 return (NULL); 1797 } 1798 #endif 1799 soisconnected(stcb->sctp_socket); 1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1801 SCTP_SOCKET_UNLOCK(so, 1); 1802 #endif 1803 } 1804 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1806 else 1807 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1808 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1809 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1810 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1811 } else { 1812 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1813 } 1814 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1815 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1816 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1817 stcb->sctp_ep, stcb, asoc->primary_destination); 1818 } 1819 sctp_stop_all_cookie_timers(stcb); 1820 sctp_toss_old_cookies(stcb, asoc); 1821 sctp_send_cookie_ack(stcb); 1822 if (spec_flag) { 1823 /* 1824 * only if we have retrans set do we do this. What 1825 * this call does is get only the COOKIE-ACK out and 1826 * then when we return the normal call to 1827 * sctp_chunk_output will get the retrans out behind 1828 * this. 1829 */ 1830 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1831 } 1832 if (how_indx < sizeof(asoc->cookie_how)) 1833 asoc->cookie_how[how_indx] = 11; 1834 1835 return (stcb); 1836 } 1837 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1838 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1839 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1840 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1841 cookie->tie_tag_peer_vtag != 0) { 1842 struct sctpasochead *head; 1843 1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1845 struct socket *so; 1846 1847 #endif 1848 1849 if (asoc->peer_supports_nat) { 1850 /* 1851 * This is a gross gross hack. Just call the 1852 * cookie_new code since we are allowing a duplicate 1853 * association. I hope this works... 1854 */ 1855 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1856 sh, cookie, cookie_len, 1857 inp, netp, init_src, notification, 1858 auth_skipped, auth_offset, auth_len, 1859 use_mflowid, mflowid, 1860 vrf_id, port)); 1861 } 1862 /* 1863 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1864 */ 1865 /* temp code */ 1866 if (how_indx < sizeof(asoc->cookie_how)) 1867 asoc->cookie_how[how_indx] = 12; 1868 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1869 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1870 1871 /* notify upper layer */ 1872 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1873 atomic_add_int(&stcb->asoc.refcnt, 1); 1874 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1875 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1876 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1877 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1878 } 1879 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1881 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1882 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1883 } 1884 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1885 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, asoc->primary_destination); 1888 1889 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1890 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1891 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1892 } 1893 asoc->pre_open_streams = 1894 ntohs(initack_cp->init.num_outbound_streams); 1895 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1896 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1897 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1898 1899 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1900 1901 asoc->str_reset_seq_in = asoc->init_seq_number; 1902 1903 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1904 if (asoc->mapping_array) { 1905 memset(asoc->mapping_array, 0, 1906 asoc->mapping_array_size); 1907 } 1908 if (asoc->nr_mapping_array) { 1909 memset(asoc->nr_mapping_array, 0, 1910 asoc->mapping_array_size); 1911 } 1912 SCTP_TCB_UNLOCK(stcb); 1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 so = SCTP_INP_SO(stcb->sctp_ep); 1915 SCTP_SOCKET_LOCK(so, 1); 1916 #endif 1917 SCTP_INP_INFO_WLOCK(); 1918 SCTP_INP_WLOCK(stcb->sctp_ep); 1919 SCTP_TCB_LOCK(stcb); 1920 atomic_add_int(&stcb->asoc.refcnt, -1); 1921 /* send up all the data */ 1922 SCTP_TCB_SEND_LOCK(stcb); 1923 1924 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1925 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1926 stcb->asoc.strmout[i].chunks_on_queues = 0; 1927 #if defined(SCTP_DETAILED_STR_STATS) 1928 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1929 asoc->strmout[i].abandoned_sent[j] = 0; 1930 asoc->strmout[i].abandoned_unsent[j] = 0; 1931 } 1932 #else 1933 asoc->strmout[i].abandoned_sent[0] = 0; 1934 asoc->strmout[i].abandoned_unsent[0] = 0; 1935 #endif 1936 stcb->asoc.strmout[i].stream_no = i; 1937 stcb->asoc.strmout[i].next_sequence_send = 0; 1938 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1939 } 1940 /* process the INIT-ACK info (my info) */ 1941 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1942 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1943 1944 /* pull from vtag hash */ 1945 LIST_REMOVE(stcb, sctp_asocs); 1946 /* re-insert to new vtag position */ 1947 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1948 SCTP_BASE_INFO(hashasocmark))]; 1949 /* 1950 * put it in the bucket in the vtag hash of assoc's for the 1951 * system 1952 */ 1953 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1954 1955 SCTP_TCB_SEND_UNLOCK(stcb); 1956 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1957 SCTP_INP_INFO_WUNLOCK(); 1958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1959 SCTP_SOCKET_UNLOCK(so, 1); 1960 #endif 1961 asoc->total_flight = 0; 1962 asoc->total_flight_count = 0; 1963 /* process the INIT info (peer's info) */ 1964 retval = sctp_process_init(init_cp, stcb); 1965 if (retval < 0) { 1966 if (how_indx < sizeof(asoc->cookie_how)) 1967 asoc->cookie_how[how_indx] = 13; 1968 1969 return (NULL); 1970 } 1971 /* 1972 * since we did not send a HB make sure we don't double 1973 * things 1974 */ 1975 net->hb_responded = 1; 1976 1977 if (sctp_load_addresses_from_init(stcb, m, 1978 init_offset + sizeof(struct sctp_init_chunk), 1979 initack_offset, src, dst, init_src)) { 1980 if (how_indx < sizeof(asoc->cookie_how)) 1981 asoc->cookie_how[how_indx] = 14; 1982 1983 return (NULL); 1984 } 1985 /* respond with a COOKIE-ACK */ 1986 sctp_stop_all_cookie_timers(stcb); 1987 sctp_toss_old_cookies(stcb, asoc); 1988 sctp_send_cookie_ack(stcb); 1989 if (how_indx < sizeof(asoc->cookie_how)) 1990 asoc->cookie_how[how_indx] = 15; 1991 1992 return (stcb); 1993 } 1994 if (how_indx < sizeof(asoc->cookie_how)) 1995 asoc->cookie_how[how_indx] = 16; 1996 /* all other cases... */ 1997 return (NULL); 1998 } 1999 2000 2001 /* 2002 * handle a state cookie for a new association m: input packet mbuf chain-- 2003 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2004 * and the cookie signature does not exist offset: offset into mbuf to the 2005 * cookie-echo chunk length: length of the cookie chunk to: where the init 2006 * was from returns a new TCB 2007 */ 2008 static struct sctp_tcb * 2009 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2010 struct sockaddr *src, struct sockaddr *dst, 2011 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2012 struct sctp_inpcb *inp, struct sctp_nets **netp, 2013 struct sockaddr *init_src, int *notification, 2014 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2015 uint8_t use_mflowid, uint32_t mflowid, 2016 uint32_t vrf_id, uint16_t port) 2017 { 2018 struct sctp_tcb *stcb; 2019 struct sctp_init_chunk *init_cp, init_buf; 2020 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2021 union sctp_sockstore store; 2022 struct sctp_association *asoc; 2023 int init_offset, initack_offset, initack_limit; 2024 int retval; 2025 int error = 0; 2026 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2027 2028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2029 struct socket *so; 2030 2031 so = SCTP_INP_SO(inp); 2032 #endif 2033 2034 /* 2035 * find and validate the INIT chunk in the cookie (peer's info) the 2036 * INIT should start after the cookie-echo header struct (chunk 2037 * header, state cookie header struct) 2038 */ 2039 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2040 init_cp = (struct sctp_init_chunk *) 2041 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2042 (uint8_t *) & init_buf); 2043 if (init_cp == NULL) { 2044 /* could not pull a INIT chunk in cookie */ 2045 SCTPDBG(SCTP_DEBUG_INPUT1, 2046 "process_cookie_new: could not pull INIT chunk hdr\n"); 2047 return (NULL); 2048 } 2049 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2050 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2051 return (NULL); 2052 } 2053 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2054 /* 2055 * find and validate the INIT-ACK chunk in the cookie (my info) the 2056 * INIT-ACK follows the INIT chunk 2057 */ 2058 initack_cp = (struct sctp_init_ack_chunk *) 2059 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2060 (uint8_t *) & initack_buf); 2061 if (initack_cp == NULL) { 2062 /* could not pull INIT-ACK chunk in cookie */ 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2064 return (NULL); 2065 } 2066 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2067 return (NULL); 2068 } 2069 /* 2070 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2071 * "initack_limit" value. This is because the chk_length field 2072 * includes the length of the cookie, but the cookie is omitted when 2073 * the INIT and INIT_ACK are tacked onto the cookie... 2074 */ 2075 initack_limit = offset + cookie_len; 2076 2077 /* 2078 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2079 * and popluate 2080 */ 2081 2082 /* 2083 * Here we do a trick, we set in NULL for the proc/thread argument. 2084 * We do this since in effect we only use the p argument when the 2085 * socket is unbound and we must do an implicit bind. Since we are 2086 * getting a cookie, we cannot be unbound. 2087 */ 2088 stcb = sctp_aloc_assoc(inp, init_src, &error, 2089 ntohl(initack_cp->init.initiate_tag), vrf_id, 2090 (struct thread *)NULL 2091 ); 2092 if (stcb == NULL) { 2093 struct mbuf *op_err; 2094 2095 /* memory problem? */ 2096 SCTPDBG(SCTP_DEBUG_INPUT1, 2097 "process_cookie_new: no room for another TCB!\n"); 2098 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2099 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2100 src, dst, sh, op_err, 2101 use_mflowid, mflowid, 2102 vrf_id, port); 2103 return (NULL); 2104 } 2105 /* get the correct sctp_nets */ 2106 if (netp) 2107 *netp = sctp_findnet(stcb, init_src); 2108 2109 asoc = &stcb->asoc; 2110 /* get scope variables out of cookie */ 2111 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2112 asoc->scope.site_scope = cookie->site_scope; 2113 asoc->scope.local_scope = cookie->local_scope; 2114 asoc->scope.loopback_scope = cookie->loopback_scope; 2115 2116 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2117 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2118 struct mbuf *op_err; 2119 2120 /* 2121 * Houston we have a problem. The EP changed while the 2122 * cookie was in flight. Only recourse is to abort the 2123 * association. 2124 */ 2125 atomic_add_int(&stcb->asoc.refcnt, 1); 2126 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2127 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2128 src, dst, sh, op_err, 2129 use_mflowid, mflowid, 2130 vrf_id, port); 2131 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135 #endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2138 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2139 SCTP_SOCKET_UNLOCK(so, 1); 2140 #endif 2141 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2142 return (NULL); 2143 } 2144 /* process the INIT-ACK info (my info) */ 2145 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2146 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2147 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2148 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2149 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2150 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2151 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2152 asoc->str_reset_seq_in = asoc->init_seq_number; 2153 2154 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2155 2156 /* process the INIT info (peer's info) */ 2157 if (netp) 2158 retval = sctp_process_init(init_cp, stcb); 2159 else 2160 retval = 0; 2161 if (retval < 0) { 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2164 SCTP_TCB_UNLOCK(stcb); 2165 SCTP_SOCKET_LOCK(so, 1); 2166 SCTP_TCB_LOCK(stcb); 2167 #endif 2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_SOCKET_UNLOCK(so, 1); 2171 #endif 2172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2173 return (NULL); 2174 } 2175 /* load all addresses */ 2176 if (sctp_load_addresses_from_init(stcb, m, 2177 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2178 src, dst, init_src)) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184 #endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188 #endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 /* 2193 * verify any preceding AUTH chunk that was skipped 2194 */ 2195 /* pull the local authentication parameters from the cookie/init-ack */ 2196 sctp_auth_get_cookie_params(stcb, m, 2197 initack_offset + sizeof(struct sctp_init_ack_chunk), 2198 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2199 if (auth_skipped) { 2200 struct sctp_auth_chunk *auth; 2201 2202 auth = (struct sctp_auth_chunk *) 2203 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2204 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2205 /* auth HMAC failed, dump the assoc and packet */ 2206 SCTPDBG(SCTP_DEBUG_AUTH1, 2207 "COOKIE-ECHO: AUTH failed\n"); 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_TCB_UNLOCK(stcb); 2211 SCTP_SOCKET_LOCK(so, 1); 2212 SCTP_TCB_LOCK(stcb); 2213 #endif 2214 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2216 SCTP_SOCKET_UNLOCK(so, 1); 2217 #endif 2218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2219 return (NULL); 2220 } else { 2221 /* remaining chunks checked... good to go */ 2222 stcb->asoc.authenticated = 1; 2223 } 2224 } 2225 /* update current state */ 2226 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2227 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2228 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2229 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2230 stcb->sctp_ep, stcb, asoc->primary_destination); 2231 } 2232 sctp_stop_all_cookie_timers(stcb); 2233 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2234 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2235 2236 /* 2237 * if we're doing ASCONFs, check to see if we have any new local 2238 * addresses that need to get added to the peer (eg. addresses 2239 * changed while cookie echo in flight). This needs to be done 2240 * after we go to the OPEN state to do the correct asconf 2241 * processing. else, make sure we have the correct addresses in our 2242 * lists 2243 */ 2244 2245 /* warning, we re-use sin, sin6, sa_store here! */ 2246 /* pull in local_address (our "from" address) */ 2247 switch (cookie->laddr_type) { 2248 #ifdef INET 2249 case SCTP_IPV4_ADDRESS: 2250 /* source addr is IPv4 */ 2251 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2252 store.sin.sin_family = AF_INET; 2253 store.sin.sin_len = sizeof(struct sockaddr_in); 2254 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2255 break; 2256 #endif 2257 #ifdef INET6 2258 case SCTP_IPV6_ADDRESS: 2259 /* source addr is IPv6 */ 2260 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2261 store.sin6.sin6_family = AF_INET6; 2262 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2263 store.sin6.sin6_scope_id = cookie->scope_id; 2264 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2265 break; 2266 #endif 2267 default: 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2270 SCTP_TCB_UNLOCK(stcb); 2271 SCTP_SOCKET_LOCK(so, 1); 2272 SCTP_TCB_LOCK(stcb); 2273 #endif 2274 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2276 SCTP_SOCKET_UNLOCK(so, 1); 2277 #endif 2278 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2279 return (NULL); 2280 } 2281 2282 /* set up to notify upper layer */ 2283 *notification = SCTP_NOTIFY_ASSOC_UP; 2284 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2285 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2286 (inp->sctp_socket->so_qlimit == 0)) { 2287 /* 2288 * This is an endpoint that called connect() how it got a 2289 * cookie that is NEW is a bit of a mystery. It must be that 2290 * the INIT was sent, but before it got there.. a complete 2291 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2292 * should have went to the other code.. not here.. oh well.. 2293 * a bit of protection is worth having.. 2294 */ 2295 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 atomic_add_int(&stcb->asoc.refcnt, 1); 2298 SCTP_TCB_UNLOCK(stcb); 2299 SCTP_SOCKET_LOCK(so, 1); 2300 SCTP_TCB_LOCK(stcb); 2301 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2302 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2303 SCTP_SOCKET_UNLOCK(so, 1); 2304 return (NULL); 2305 } 2306 #endif 2307 soisconnected(stcb->sctp_socket); 2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2309 SCTP_SOCKET_UNLOCK(so, 1); 2310 #endif 2311 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2312 (inp->sctp_socket->so_qlimit)) { 2313 /* 2314 * We don't want to do anything with this one. Since it is 2315 * the listening guy. The timer will get started for 2316 * accepted connections in the caller. 2317 */ 2318 ; 2319 } 2320 /* since we did not send a HB make sure we don't double things */ 2321 if ((netp) && (*netp)) 2322 (*netp)->hb_responded = 1; 2323 2324 if (stcb->asoc.sctp_autoclose_ticks && 2325 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2326 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2327 } 2328 /* calculate the RTT */ 2329 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2330 if ((netp) && (*netp)) { 2331 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2332 &cookie->time_entered, sctp_align_unsafe_makecopy, 2333 SCTP_RTT_FROM_NON_DATA); 2334 } 2335 /* respond with a COOKIE-ACK */ 2336 sctp_send_cookie_ack(stcb); 2337 2338 /* 2339 * check the address lists for any ASCONFs that need to be sent 2340 * AFTER the cookie-ack is sent 2341 */ 2342 sctp_check_address_list(stcb, m, 2343 initack_offset + sizeof(struct sctp_init_ack_chunk), 2344 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2345 &store.sa, cookie->local_scope, cookie->site_scope, 2346 cookie->ipv4_scope, cookie->loopback_scope); 2347 2348 2349 return (stcb); 2350 } 2351 2352 /* 2353 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2354 * we NEED to make sure we are not already using the vtag. If so we 2355 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2356 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2357 SCTP_BASE_INFO(hashasocmark))]; 2358 LIST_FOREACH(stcb, head, sctp_asocs) { 2359 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2360 -- SEND ABORT - TRY AGAIN -- 2361 } 2362 } 2363 */ 2364 2365 /* 2366 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2367 * existing (non-NULL) TCB 2368 */ 2369 static struct mbuf * 2370 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2371 struct sockaddr *src, struct sockaddr *dst, 2372 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2373 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2374 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2375 struct sctp_tcb **locked_tcb, 2376 uint8_t use_mflowid, uint32_t mflowid, 2377 uint32_t vrf_id, uint16_t port) 2378 { 2379 struct sctp_state_cookie *cookie; 2380 struct sctp_tcb *l_stcb = *stcb; 2381 struct sctp_inpcb *l_inp; 2382 struct sockaddr *to; 2383 struct sctp_pcb *ep; 2384 struct mbuf *m_sig; 2385 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2386 uint8_t *sig; 2387 uint8_t cookie_ok = 0; 2388 unsigned int sig_offset, cookie_offset; 2389 unsigned int cookie_len; 2390 struct timeval now; 2391 struct timeval time_expires; 2392 int notification = 0; 2393 struct sctp_nets *netl; 2394 int had_a_existing_tcb = 0; 2395 int send_int_conf = 0; 2396 2397 #ifdef INET 2398 struct sockaddr_in sin; 2399 2400 #endif 2401 #ifdef INET6 2402 struct sockaddr_in6 sin6; 2403 2404 #endif 2405 2406 SCTPDBG(SCTP_DEBUG_INPUT2, 2407 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2408 2409 if (inp_p == NULL) { 2410 return (NULL); 2411 } 2412 cookie = &cp->cookie; 2413 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2414 cookie_len = ntohs(cp->ch.chunk_length); 2415 2416 if ((cookie->peerport != sh->src_port) && 2417 (cookie->myport != sh->dest_port) && 2418 (cookie->my_vtag != sh->v_tag)) { 2419 /* 2420 * invalid ports or bad tag. Note that we always leave the 2421 * v_tag in the header in network order and when we stored 2422 * it in the my_vtag slot we also left it in network order. 2423 * This maintains the match even though it may be in the 2424 * opposite byte order of the machine :-> 2425 */ 2426 return (NULL); 2427 } 2428 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2429 sizeof(struct sctp_init_chunk) + 2430 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2431 /* cookie too small */ 2432 return (NULL); 2433 } 2434 /* 2435 * split off the signature into its own mbuf (since it should not be 2436 * calculated in the sctp_hmac_m() call). 2437 */ 2438 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2439 m_sig = m_split(m, sig_offset, M_NOWAIT); 2440 if (m_sig == NULL) { 2441 /* out of memory or ?? */ 2442 return (NULL); 2443 } 2444 #ifdef SCTP_MBUF_LOGGING 2445 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2446 struct mbuf *mat; 2447 2448 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2449 if (SCTP_BUF_IS_EXTENDED(mat)) { 2450 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2451 } 2452 } 2453 } 2454 #endif 2455 2456 /* 2457 * compute the signature/digest for the cookie 2458 */ 2459 ep = &(*inp_p)->sctp_ep; 2460 l_inp = *inp_p; 2461 if (l_stcb) { 2462 SCTP_TCB_UNLOCK(l_stcb); 2463 } 2464 SCTP_INP_RLOCK(l_inp); 2465 if (l_stcb) { 2466 SCTP_TCB_LOCK(l_stcb); 2467 } 2468 /* which cookie is it? */ 2469 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2470 (ep->current_secret_number != ep->last_secret_number)) { 2471 /* it's the old cookie */ 2472 (void)sctp_hmac_m(SCTP_HMAC, 2473 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2474 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2475 } else { 2476 /* it's the current cookie */ 2477 (void)sctp_hmac_m(SCTP_HMAC, 2478 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2479 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2480 } 2481 /* get the signature */ 2482 SCTP_INP_RUNLOCK(l_inp); 2483 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2484 if (sig == NULL) { 2485 /* couldn't find signature */ 2486 sctp_m_freem(m_sig); 2487 return (NULL); 2488 } 2489 /* compare the received digest with the computed digest */ 2490 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2491 /* try the old cookie? */ 2492 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2493 (ep->current_secret_number != ep->last_secret_number)) { 2494 /* compute digest with old */ 2495 (void)sctp_hmac_m(SCTP_HMAC, 2496 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2497 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2498 /* compare */ 2499 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2500 cookie_ok = 1; 2501 } 2502 } else { 2503 cookie_ok = 1; 2504 } 2505 2506 /* 2507 * Now before we continue we must reconstruct our mbuf so that 2508 * normal processing of any other chunks will work. 2509 */ 2510 { 2511 struct mbuf *m_at; 2512 2513 m_at = m; 2514 while (SCTP_BUF_NEXT(m_at) != NULL) { 2515 m_at = SCTP_BUF_NEXT(m_at); 2516 } 2517 SCTP_BUF_NEXT(m_at) = m_sig; 2518 } 2519 2520 if (cookie_ok == 0) { 2521 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2522 SCTPDBG(SCTP_DEBUG_INPUT2, 2523 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2524 (uint32_t) offset, cookie_offset, sig_offset); 2525 return (NULL); 2526 } 2527 /* 2528 * check the cookie timestamps to be sure it's not stale 2529 */ 2530 (void)SCTP_GETTIME_TIMEVAL(&now); 2531 /* Expire time is in Ticks, so we convert to seconds */ 2532 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2533 time_expires.tv_usec = cookie->time_entered.tv_usec; 2534 /* 2535 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2536 * is undefined. 2537 */ 2538 if (timevalcmp(&now, &time_expires, >)) { 2539 /* cookie is stale! */ 2540 struct mbuf *op_err; 2541 struct sctp_stale_cookie_msg *scm; 2542 uint32_t tim; 2543 2544 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2545 0, M_NOWAIT, 1, MT_DATA); 2546 if (op_err == NULL) { 2547 /* FOOBAR */ 2548 return (NULL); 2549 } 2550 /* Set the len */ 2551 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2552 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2553 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2554 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2555 (sizeof(uint32_t)))); 2556 /* seconds to usec */ 2557 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2558 /* add in usec */ 2559 if (tim == 0) 2560 tim = now.tv_usec - cookie->time_entered.tv_usec; 2561 scm->time_usec = htonl(tim); 2562 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2563 use_mflowid, mflowid, 2564 vrf_id, port); 2565 return (NULL); 2566 } 2567 /* 2568 * Now we must see with the lookup address if we have an existing 2569 * asoc. This will only happen if we were in the COOKIE-WAIT state 2570 * and a INIT collided with us and somewhere the peer sent the 2571 * cookie on another address besides the single address our assoc 2572 * had for him. In this case we will have one of the tie-tags set at 2573 * least AND the address field in the cookie can be used to look it 2574 * up. 2575 */ 2576 to = NULL; 2577 switch (cookie->addr_type) { 2578 #ifdef INET6 2579 case SCTP_IPV6_ADDRESS: 2580 memset(&sin6, 0, sizeof(sin6)); 2581 sin6.sin6_family = AF_INET6; 2582 sin6.sin6_len = sizeof(sin6); 2583 sin6.sin6_port = sh->src_port; 2584 sin6.sin6_scope_id = cookie->scope_id; 2585 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2586 sizeof(sin6.sin6_addr.s6_addr)); 2587 to = (struct sockaddr *)&sin6; 2588 break; 2589 #endif 2590 #ifdef INET 2591 case SCTP_IPV4_ADDRESS: 2592 memset(&sin, 0, sizeof(sin)); 2593 sin.sin_family = AF_INET; 2594 sin.sin_len = sizeof(sin); 2595 sin.sin_port = sh->src_port; 2596 sin.sin_addr.s_addr = cookie->address[0]; 2597 to = (struct sockaddr *)&sin; 2598 break; 2599 #endif 2600 default: 2601 /* This should not happen */ 2602 return (NULL); 2603 } 2604 if ((*stcb == NULL) && to) { 2605 /* Yep, lets check */ 2606 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2607 if (*stcb == NULL) { 2608 /* 2609 * We should have only got back the same inp. If we 2610 * got back a different ep we have a problem. The 2611 * original findep got back l_inp and now 2612 */ 2613 if (l_inp != *inp_p) { 2614 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2615 } 2616 } else { 2617 if (*locked_tcb == NULL) { 2618 /* 2619 * In this case we found the assoc only 2620 * after we locked the create lock. This 2621 * means we are in a colliding case and we 2622 * must make sure that we unlock the tcb if 2623 * its one of the cases where we throw away 2624 * the incoming packets. 2625 */ 2626 *locked_tcb = *stcb; 2627 2628 /* 2629 * We must also increment the inp ref count 2630 * since the ref_count flags was set when we 2631 * did not find the TCB, now we found it 2632 * which reduces the refcount.. we must 2633 * raise it back out to balance it all :-) 2634 */ 2635 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2636 if ((*stcb)->sctp_ep != l_inp) { 2637 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2638 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2639 } 2640 } 2641 } 2642 } 2643 if (to == NULL) { 2644 return (NULL); 2645 } 2646 cookie_len -= SCTP_SIGNATURE_SIZE; 2647 if (*stcb == NULL) { 2648 /* this is the "normal" case... get a new TCB */ 2649 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2650 cookie, cookie_len, *inp_p, 2651 netp, to, ¬ification, 2652 auth_skipped, auth_offset, auth_len, 2653 use_mflowid, mflowid, 2654 vrf_id, port); 2655 } else { 2656 /* this is abnormal... cookie-echo on existing TCB */ 2657 had_a_existing_tcb = 1; 2658 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2659 src, dst, sh, 2660 cookie, cookie_len, *inp_p, *stcb, netp, to, 2661 ¬ification, auth_skipped, auth_offset, auth_len, 2662 use_mflowid, mflowid, 2663 vrf_id, port); 2664 } 2665 2666 if (*stcb == NULL) { 2667 /* still no TCB... must be bad cookie-echo */ 2668 return (NULL); 2669 } 2670 if ((*netp != NULL) && (use_mflowid != 0)) { 2671 (*netp)->flowid = mflowid; 2672 #ifdef INVARIANTS 2673 (*netp)->flowidset = 1; 2674 #endif 2675 } 2676 /* 2677 * Ok, we built an association so confirm the address we sent the 2678 * INIT-ACK to. 2679 */ 2680 netl = sctp_findnet(*stcb, to); 2681 /* 2682 * This code should in theory NOT run but 2683 */ 2684 if (netl == NULL) { 2685 /* TSNH! Huh, why do I need to add this address here? */ 2686 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2687 return (NULL); 2688 } 2689 netl = sctp_findnet(*stcb, to); 2690 } 2691 if (netl) { 2692 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2693 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2694 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2695 netl); 2696 send_int_conf = 1; 2697 } 2698 } 2699 sctp_start_net_timers(*stcb); 2700 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2701 if (!had_a_existing_tcb || 2702 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2703 /* 2704 * If we have a NEW cookie or the connect never 2705 * reached the connected state during collision we 2706 * must do the TCP accept thing. 2707 */ 2708 struct socket *so, *oso; 2709 struct sctp_inpcb *inp; 2710 2711 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2712 /* 2713 * For a restart we will keep the same 2714 * socket, no need to do anything. I THINK!! 2715 */ 2716 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2717 if (send_int_conf) { 2718 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2719 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2720 } 2721 return (m); 2722 } 2723 oso = (*inp_p)->sctp_socket; 2724 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2725 SCTP_TCB_UNLOCK((*stcb)); 2726 CURVNET_SET(oso->so_vnet); 2727 so = sonewconn(oso, 0 2728 ); 2729 CURVNET_RESTORE(); 2730 SCTP_TCB_LOCK((*stcb)); 2731 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2732 2733 if (so == NULL) { 2734 struct mbuf *op_err; 2735 2736 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2737 struct socket *pcb_so; 2738 2739 #endif 2740 /* Too many sockets */ 2741 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2742 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2743 sctp_abort_association(*inp_p, NULL, m, iphlen, 2744 src, dst, sh, op_err, 2745 use_mflowid, mflowid, 2746 vrf_id, port); 2747 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2748 pcb_so = SCTP_INP_SO(*inp_p); 2749 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2750 SCTP_TCB_UNLOCK((*stcb)); 2751 SCTP_SOCKET_LOCK(pcb_so, 1); 2752 SCTP_TCB_LOCK((*stcb)); 2753 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2754 #endif 2755 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2756 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2757 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2758 #endif 2759 return (NULL); 2760 } 2761 inp = (struct sctp_inpcb *)so->so_pcb; 2762 SCTP_INP_INCR_REF(inp); 2763 /* 2764 * We add the unbound flag here so that if we get an 2765 * soabort() before we get the move_pcb done, we 2766 * will properly cleanup. 2767 */ 2768 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2769 SCTP_PCB_FLAGS_CONNECTED | 2770 SCTP_PCB_FLAGS_IN_TCPPOOL | 2771 SCTP_PCB_FLAGS_UNBOUND | 2772 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2773 SCTP_PCB_FLAGS_DONT_WAKE); 2774 inp->sctp_features = (*inp_p)->sctp_features; 2775 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2776 inp->sctp_socket = so; 2777 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2778 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2779 inp->ecn_supported = (*inp_p)->ecn_supported; 2780 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2781 inp->auth_supported = (*inp_p)->auth_supported; 2782 inp->asconf_supported = (*inp_p)->asconf_supported; 2783 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2784 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2785 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2786 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2787 inp->sctp_context = (*inp_p)->sctp_context; 2788 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2789 inp->inp_starting_point_for_iterator = NULL; 2790 /* 2791 * copy in the authentication parameters from the 2792 * original endpoint 2793 */ 2794 if (inp->sctp_ep.local_hmacs) 2795 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2796 inp->sctp_ep.local_hmacs = 2797 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2798 if (inp->sctp_ep.local_auth_chunks) 2799 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2800 inp->sctp_ep.local_auth_chunks = 2801 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2802 2803 /* 2804 * Now we must move it from one hash table to 2805 * another and get the tcb in the right place. 2806 */ 2807 2808 /* 2809 * This is where the one-2-one socket is put into 2810 * the accept state waiting for the accept! 2811 */ 2812 if (*stcb) { 2813 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2814 } 2815 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2816 2817 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2818 SCTP_TCB_UNLOCK((*stcb)); 2819 2820 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2821 0); 2822 SCTP_TCB_LOCK((*stcb)); 2823 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2824 2825 2826 /* 2827 * now we must check to see if we were aborted while 2828 * the move was going on and the lock/unlock 2829 * happened. 2830 */ 2831 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2832 /* 2833 * yep it was, we leave the assoc attached 2834 * to the socket since the sctp_inpcb_free() 2835 * call will send an abort for us. 2836 */ 2837 SCTP_INP_DECR_REF(inp); 2838 return (NULL); 2839 } 2840 SCTP_INP_DECR_REF(inp); 2841 /* Switch over to the new guy */ 2842 *inp_p = inp; 2843 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2844 if (send_int_conf) { 2845 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2846 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2847 } 2848 /* 2849 * Pull it from the incomplete queue and wake the 2850 * guy 2851 */ 2852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2853 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2854 SCTP_TCB_UNLOCK((*stcb)); 2855 SCTP_SOCKET_LOCK(so, 1); 2856 #endif 2857 soisconnected(so); 2858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2859 SCTP_TCB_LOCK((*stcb)); 2860 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2861 SCTP_SOCKET_UNLOCK(so, 1); 2862 #endif 2863 return (m); 2864 } 2865 } 2866 if (notification) { 2867 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2868 } 2869 if (send_int_conf) { 2870 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2871 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2872 } 2873 return (m); 2874 } 2875 2876 static void 2877 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2878 struct sctp_tcb *stcb, struct sctp_nets *net) 2879 { 2880 /* cp must not be used, others call this without a c-ack :-) */ 2881 struct sctp_association *asoc; 2882 2883 SCTPDBG(SCTP_DEBUG_INPUT2, 2884 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2885 if ((stcb == NULL) || (net == NULL)) { 2886 return; 2887 } 2888 asoc = &stcb->asoc; 2889 2890 sctp_stop_all_cookie_timers(stcb); 2891 /* process according to association state */ 2892 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2893 /* state change only needed when I am in right state */ 2894 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2895 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2896 sctp_start_net_timers(stcb); 2897 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2898 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2899 stcb->sctp_ep, stcb, asoc->primary_destination); 2900 2901 } 2902 /* update RTO */ 2903 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2904 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2905 if (asoc->overall_error_count == 0) { 2906 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2907 &asoc->time_entered, sctp_align_safe_nocopy, 2908 SCTP_RTT_FROM_NON_DATA); 2909 } 2910 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2911 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2912 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2913 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2914 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2915 struct socket *so; 2916 2917 #endif 2918 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2919 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2920 so = SCTP_INP_SO(stcb->sctp_ep); 2921 atomic_add_int(&stcb->asoc.refcnt, 1); 2922 SCTP_TCB_UNLOCK(stcb); 2923 SCTP_SOCKET_LOCK(so, 1); 2924 SCTP_TCB_LOCK(stcb); 2925 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2926 #endif 2927 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2928 soisconnected(stcb->sctp_socket); 2929 } 2930 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2931 SCTP_SOCKET_UNLOCK(so, 1); 2932 #endif 2933 } 2934 /* 2935 * since we did not send a HB make sure we don't double 2936 * things 2937 */ 2938 net->hb_responded = 1; 2939 2940 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2941 /* 2942 * We don't need to do the asconf thing, nor hb or 2943 * autoclose if the socket is closed. 2944 */ 2945 goto closed_socket; 2946 } 2947 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2948 stcb, net); 2949 2950 2951 if (stcb->asoc.sctp_autoclose_ticks && 2952 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2953 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2954 stcb->sctp_ep, stcb, NULL); 2955 } 2956 /* 2957 * send ASCONF if parameters are pending and ASCONFs are 2958 * allowed (eg. addresses changed when init/cookie echo were 2959 * in flight) 2960 */ 2961 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2962 (stcb->asoc.asconf_supported == 1) && 2963 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2964 #ifdef SCTP_TIMER_BASED_ASCONF 2965 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2966 stcb->sctp_ep, stcb, 2967 stcb->asoc.primary_destination); 2968 #else 2969 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2970 SCTP_ADDR_NOT_LOCKED); 2971 #endif 2972 } 2973 } 2974 closed_socket: 2975 /* Toss the cookie if I can */ 2976 sctp_toss_old_cookies(stcb, asoc); 2977 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2978 /* Restart the timer if we have pending data */ 2979 struct sctp_tmit_chunk *chk; 2980 2981 chk = TAILQ_FIRST(&asoc->sent_queue); 2982 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2983 } 2984 } 2985 2986 static void 2987 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2988 struct sctp_tcb *stcb) 2989 { 2990 struct sctp_nets *net; 2991 struct sctp_tmit_chunk *lchk; 2992 struct sctp_ecne_chunk bkup; 2993 uint8_t override_bit; 2994 uint32_t tsn, window_data_tsn; 2995 int len; 2996 unsigned int pkt_cnt; 2997 2998 len = ntohs(cp->ch.chunk_length); 2999 if ((len != sizeof(struct sctp_ecne_chunk)) && 3000 (len != sizeof(struct old_sctp_ecne_chunk))) { 3001 return; 3002 } 3003 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3004 /* Its the old format */ 3005 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3006 bkup.num_pkts_since_cwr = htonl(1); 3007 cp = &bkup; 3008 } 3009 SCTP_STAT_INCR(sctps_recvecne); 3010 tsn = ntohl(cp->tsn); 3011 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3012 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3013 if (lchk == NULL) { 3014 window_data_tsn = stcb->asoc.sending_seq - 1; 3015 } else { 3016 window_data_tsn = lchk->rec.data.TSN_seq; 3017 } 3018 3019 /* Find where it was sent to if possible. */ 3020 net = NULL; 3021 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3022 if (lchk->rec.data.TSN_seq == tsn) { 3023 net = lchk->whoTo; 3024 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3025 break; 3026 } 3027 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3028 break; 3029 } 3030 } 3031 if (net == NULL) { 3032 /* 3033 * What to do. A previous send of a CWR was possibly lost. 3034 * See how old it is, we may have it marked on the actual 3035 * net. 3036 */ 3037 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3038 if (tsn == net->last_cwr_tsn) { 3039 /* Found him, send it off */ 3040 break; 3041 } 3042 } 3043 if (net == NULL) { 3044 /* 3045 * If we reach here, we need to send a special CWR 3046 * that says hey, we did this a long time ago and 3047 * you lost the response. 3048 */ 3049 net = TAILQ_FIRST(&stcb->asoc.nets); 3050 if (net == NULL) { 3051 /* TSNH */ 3052 return; 3053 } 3054 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3055 } else { 3056 override_bit = 0; 3057 } 3058 } else { 3059 override_bit = 0; 3060 } 3061 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3062 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3063 /* 3064 * JRS - Use the congestion control given in the pluggable 3065 * CC module 3066 */ 3067 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3068 /* 3069 * We reduce once every RTT. So we will only lower cwnd at 3070 * the next sending seq i.e. the window_data_tsn 3071 */ 3072 net->cwr_window_tsn = window_data_tsn; 3073 net->ecn_ce_pkt_cnt += pkt_cnt; 3074 net->lost_cnt = pkt_cnt; 3075 net->last_cwr_tsn = tsn; 3076 } else { 3077 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3078 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3079 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3080 /* 3081 * Another loss in the same window update how many 3082 * marks/packets lost we have had. 3083 */ 3084 int cnt = 1; 3085 3086 if (pkt_cnt > net->lost_cnt) { 3087 /* Should be the case */ 3088 cnt = (pkt_cnt - net->lost_cnt); 3089 net->ecn_ce_pkt_cnt += cnt; 3090 } 3091 net->lost_cnt = pkt_cnt; 3092 net->last_cwr_tsn = tsn; 3093 /* 3094 * Most CC functions will ignore this call, since we 3095 * are in-window yet of the initial CE the peer saw. 3096 */ 3097 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3098 } 3099 } 3100 /* 3101 * We always send a CWR this way if our previous one was lost our 3102 * peer will get an update, or if it is not time again to reduce we 3103 * still get the cwr to the peer. Note we set the override when we 3104 * could not find the TSN on the chunk or the destination network. 3105 */ 3106 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3107 } 3108 3109 static void 3110 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3111 { 3112 /* 3113 * Here we get a CWR from the peer. We must look in the outqueue and 3114 * make sure that we have a covered ECNE in the control chunk part. 3115 * If so remove it. 3116 */ 3117 struct sctp_tmit_chunk *chk; 3118 struct sctp_ecne_chunk *ecne; 3119 int override; 3120 uint32_t cwr_tsn; 3121 3122 cwr_tsn = ntohl(cp->tsn); 3123 3124 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3125 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3126 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3127 continue; 3128 } 3129 if ((override == 0) && (chk->whoTo != net)) { 3130 /* Must be from the right src unless override is set */ 3131 continue; 3132 } 3133 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3134 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3135 /* this covers this ECNE, we can remove it */ 3136 stcb->asoc.ecn_echo_cnt_onq--; 3137 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3138 sctp_next); 3139 if (chk->data) { 3140 sctp_m_freem(chk->data); 3141 chk->data = NULL; 3142 } 3143 stcb->asoc.ctrl_queue_cnt--; 3144 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3145 if (override == 0) { 3146 break; 3147 } 3148 } 3149 } 3150 } 3151 3152 static void 3153 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3154 struct sctp_tcb *stcb, struct sctp_nets *net) 3155 { 3156 struct sctp_association *asoc; 3157 3158 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3159 struct socket *so; 3160 3161 #endif 3162 3163 SCTPDBG(SCTP_DEBUG_INPUT2, 3164 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3165 if (stcb == NULL) 3166 return; 3167 3168 asoc = &stcb->asoc; 3169 /* process according to association state */ 3170 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3171 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3172 SCTPDBG(SCTP_DEBUG_INPUT2, 3173 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3174 SCTP_TCB_UNLOCK(stcb); 3175 return; 3176 } 3177 /* notify upper layer protocol */ 3178 if (stcb->sctp_socket) { 3179 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3180 } 3181 #ifdef INVARIANTS 3182 if (!TAILQ_EMPTY(&asoc->send_queue) || 3183 !TAILQ_EMPTY(&asoc->sent_queue) || 3184 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3185 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3186 } 3187 #endif 3188 /* stop the timer */ 3189 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3190 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3191 /* free the TCB */ 3192 SCTPDBG(SCTP_DEBUG_INPUT2, 3193 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3194 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3195 so = SCTP_INP_SO(stcb->sctp_ep); 3196 atomic_add_int(&stcb->asoc.refcnt, 1); 3197 SCTP_TCB_UNLOCK(stcb); 3198 SCTP_SOCKET_LOCK(so, 1); 3199 SCTP_TCB_LOCK(stcb); 3200 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3201 #endif 3202 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3203 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3204 SCTP_SOCKET_UNLOCK(so, 1); 3205 #endif 3206 return; 3207 } 3208 3209 static int 3210 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3211 struct sctp_nets *net, uint8_t flg) 3212 { 3213 switch (desc->chunk_type) { 3214 case SCTP_DATA: 3215 /* find the tsn to resend (possibly */ 3216 { 3217 uint32_t tsn; 3218 struct sctp_tmit_chunk *tp1; 3219 3220 tsn = ntohl(desc->tsn_ifany); 3221 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3222 if (tp1->rec.data.TSN_seq == tsn) { 3223 /* found it */ 3224 break; 3225 } 3226 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3227 /* not found */ 3228 tp1 = NULL; 3229 break; 3230 } 3231 } 3232 if (tp1 == NULL) { 3233 /* 3234 * Do it the other way , aka without paying 3235 * attention to queue seq order. 3236 */ 3237 SCTP_STAT_INCR(sctps_pdrpdnfnd); 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 } 3244 } 3245 if (tp1 == NULL) { 3246 SCTP_STAT_INCR(sctps_pdrptsnnf); 3247 } 3248 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3249 uint8_t *ddp; 3250 3251 if (((flg & SCTP_BADCRC) == 0) && 3252 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3253 return (0); 3254 } 3255 if ((stcb->asoc.peers_rwnd == 0) && 3256 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3257 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3258 return (0); 3259 } 3260 if (stcb->asoc.peers_rwnd == 0 && 3261 (flg & SCTP_FROM_MIDDLE_BOX)) { 3262 SCTP_STAT_INCR(sctps_pdrpdizrw); 3263 return (0); 3264 } 3265 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3266 sizeof(struct sctp_data_chunk)); 3267 { 3268 unsigned int iii; 3269 3270 for (iii = 0; iii < sizeof(desc->data_bytes); 3271 iii++) { 3272 if (ddp[iii] != desc->data_bytes[iii]) { 3273 SCTP_STAT_INCR(sctps_pdrpbadd); 3274 return (-1); 3275 } 3276 } 3277 } 3278 3279 if (tp1->do_rtt) { 3280 /* 3281 * this guy had a RTO calculation 3282 * pending on it, cancel it 3283 */ 3284 if (tp1->whoTo->rto_needed == 0) { 3285 tp1->whoTo->rto_needed = 1; 3286 } 3287 tp1->do_rtt = 0; 3288 } 3289 SCTP_STAT_INCR(sctps_pdrpmark); 3290 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3291 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3292 /* 3293 * mark it as if we were doing a FR, since 3294 * we will be getting gap ack reports behind 3295 * the info from the router. 3296 */ 3297 tp1->rec.data.doing_fast_retransmit = 1; 3298 /* 3299 * mark the tsn with what sequences can 3300 * cause a new FR. 3301 */ 3302 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3303 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3304 } else { 3305 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3306 } 3307 3308 /* restart the timer */ 3309 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3310 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3311 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3312 stcb, tp1->whoTo); 3313 3314 /* fix counts and things */ 3315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3316 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3317 tp1->whoTo->flight_size, 3318 tp1->book_size, 3319 (uintptr_t) stcb, 3320 tp1->rec.data.TSN_seq); 3321 } 3322 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3323 sctp_flight_size_decrease(tp1); 3324 sctp_total_flight_decrease(stcb, tp1); 3325 } 3326 tp1->sent = SCTP_DATAGRAM_RESEND; 3327 } { 3328 /* audit code */ 3329 unsigned int audit; 3330 3331 audit = 0; 3332 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3333 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3334 audit++; 3335 } 3336 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3337 sctp_next) { 3338 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3339 audit++; 3340 } 3341 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3342 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3343 audit, stcb->asoc.sent_queue_retran_cnt); 3344 #ifndef SCTP_AUDITING_ENABLED 3345 stcb->asoc.sent_queue_retran_cnt = audit; 3346 #endif 3347 } 3348 } 3349 } 3350 break; 3351 case SCTP_ASCONF: 3352 { 3353 struct sctp_tmit_chunk *asconf; 3354 3355 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3356 sctp_next) { 3357 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3358 break; 3359 } 3360 } 3361 if (asconf) { 3362 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3363 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3364 asconf->sent = SCTP_DATAGRAM_RESEND; 3365 asconf->snd_count--; 3366 } 3367 } 3368 break; 3369 case SCTP_INITIATION: 3370 /* resend the INIT */ 3371 stcb->asoc.dropped_special_cnt++; 3372 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3373 /* 3374 * If we can get it in, in a few attempts we do 3375 * this, otherwise we let the timer fire. 3376 */ 3377 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3378 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3379 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3380 } 3381 break; 3382 case SCTP_SELECTIVE_ACK: 3383 case SCTP_NR_SELECTIVE_ACK: 3384 /* resend the sack */ 3385 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3386 break; 3387 case SCTP_HEARTBEAT_REQUEST: 3388 /* resend a demand HB */ 3389 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3390 /* 3391 * Only retransmit if we KNOW we wont destroy the 3392 * tcb 3393 */ 3394 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3395 } 3396 break; 3397 case SCTP_SHUTDOWN: 3398 sctp_send_shutdown(stcb, net); 3399 break; 3400 case SCTP_SHUTDOWN_ACK: 3401 sctp_send_shutdown_ack(stcb, net); 3402 break; 3403 case SCTP_COOKIE_ECHO: 3404 { 3405 struct sctp_tmit_chunk *cookie; 3406 3407 cookie = NULL; 3408 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3409 sctp_next) { 3410 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3411 break; 3412 } 3413 } 3414 if (cookie) { 3415 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3416 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3417 cookie->sent = SCTP_DATAGRAM_RESEND; 3418 sctp_stop_all_cookie_timers(stcb); 3419 } 3420 } 3421 break; 3422 case SCTP_COOKIE_ACK: 3423 sctp_send_cookie_ack(stcb); 3424 break; 3425 case SCTP_ASCONF_ACK: 3426 /* resend last asconf ack */ 3427 sctp_send_asconf_ack(stcb); 3428 break; 3429 case SCTP_FORWARD_CUM_TSN: 3430 send_forward_tsn(stcb, &stcb->asoc); 3431 break; 3432 /* can't do anything with these */ 3433 case SCTP_PACKET_DROPPED: 3434 case SCTP_INITIATION_ACK: /* this should not happen */ 3435 case SCTP_HEARTBEAT_ACK: 3436 case SCTP_ABORT_ASSOCIATION: 3437 case SCTP_OPERATION_ERROR: 3438 case SCTP_SHUTDOWN_COMPLETE: 3439 case SCTP_ECN_ECHO: 3440 case SCTP_ECN_CWR: 3441 default: 3442 break; 3443 } 3444 return (0); 3445 } 3446 3447 void 3448 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3449 { 3450 uint32_t i; 3451 uint16_t temp; 3452 3453 /* 3454 * We set things to 0xffff since this is the last delivered sequence 3455 * and we will be sending in 0 after the reset. 3456 */ 3457 3458 if (number_entries) { 3459 for (i = 0; i < number_entries; i++) { 3460 temp = ntohs(list[i]); 3461 if (temp >= stcb->asoc.streamincnt) { 3462 continue; 3463 } 3464 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3465 } 3466 } else { 3467 list = NULL; 3468 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3469 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3470 } 3471 } 3472 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3473 } 3474 3475 static void 3476 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3477 { 3478 uint32_t i; 3479 uint16_t temp; 3480 3481 if (number_entries > 0) { 3482 for (i = 0; i < number_entries; i++) { 3483 temp = ntohs(list[i]); 3484 if (temp >= stcb->asoc.streamoutcnt) { 3485 /* no such stream */ 3486 continue; 3487 } 3488 stcb->asoc.strmout[temp].next_sequence_send = 0; 3489 } 3490 } else { 3491 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3492 stcb->asoc.strmout[i].next_sequence_send = 0; 3493 } 3494 } 3495 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3496 } 3497 3498 3499 struct sctp_stream_reset_out_request * 3500 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3501 { 3502 struct sctp_association *asoc; 3503 struct sctp_chunkhdr *ch; 3504 struct sctp_stream_reset_out_request *r; 3505 struct sctp_tmit_chunk *chk; 3506 int len, clen; 3507 3508 asoc = &stcb->asoc; 3509 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3510 asoc->stream_reset_outstanding = 0; 3511 return (NULL); 3512 } 3513 if (stcb->asoc.str_reset == NULL) { 3514 asoc->stream_reset_outstanding = 0; 3515 return (NULL); 3516 } 3517 chk = stcb->asoc.str_reset; 3518 if (chk->data == NULL) { 3519 return (NULL); 3520 } 3521 if (bchk) { 3522 /* he wants a copy of the chk pointer */ 3523 *bchk = chk; 3524 } 3525 clen = chk->send_size; 3526 ch = mtod(chk->data, struct sctp_chunkhdr *); 3527 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3528 if (ntohl(r->request_seq) == seq) { 3529 /* found it */ 3530 return (r); 3531 } 3532 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3533 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3534 /* move to the next one, there can only be a max of two */ 3535 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3536 if (ntohl(r->request_seq) == seq) { 3537 return (r); 3538 } 3539 } 3540 /* that seq is not here */ 3541 return (NULL); 3542 } 3543 3544 static void 3545 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3546 { 3547 struct sctp_association *asoc; 3548 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3549 3550 if (stcb->asoc.str_reset == NULL) { 3551 return; 3552 } 3553 asoc = &stcb->asoc; 3554 3555 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3556 TAILQ_REMOVE(&asoc->control_send_queue, 3557 chk, 3558 sctp_next); 3559 if (chk->data) { 3560 sctp_m_freem(chk->data); 3561 chk->data = NULL; 3562 } 3563 asoc->ctrl_queue_cnt--; 3564 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3565 /* sa_ignore NO_NULL_CHK */ 3566 stcb->asoc.str_reset = NULL; 3567 } 3568 3569 3570 static int 3571 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3572 uint32_t seq, uint32_t action, 3573 struct sctp_stream_reset_response *respin) 3574 { 3575 uint16_t type; 3576 int lparm_len; 3577 struct sctp_association *asoc = &stcb->asoc; 3578 struct sctp_tmit_chunk *chk; 3579 struct sctp_stream_reset_out_request *srparam; 3580 uint32_t number_entries; 3581 3582 if (asoc->stream_reset_outstanding == 0) { 3583 /* duplicate */ 3584 return (0); 3585 } 3586 if (seq == stcb->asoc.str_reset_seq_out) { 3587 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3588 if (srparam) { 3589 stcb->asoc.str_reset_seq_out++; 3590 type = ntohs(srparam->ph.param_type); 3591 lparm_len = ntohs(srparam->ph.param_length); 3592 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3593 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3594 asoc->stream_reset_out_is_outstanding = 0; 3595 if (asoc->stream_reset_outstanding) 3596 asoc->stream_reset_outstanding--; 3597 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3598 /* do it */ 3599 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3600 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3601 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3602 } else { 3603 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3604 } 3605 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3606 /* Answered my request */ 3607 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3608 if (asoc->stream_reset_outstanding) 3609 asoc->stream_reset_outstanding--; 3610 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3611 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3612 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3613 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3615 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3616 } 3617 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3618 /* Ok we now may have more streams */ 3619 int num_stream; 3620 3621 num_stream = stcb->asoc.strm_pending_add_size; 3622 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3623 /* TSNH */ 3624 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3625 } 3626 stcb->asoc.strm_pending_add_size = 0; 3627 if (asoc->stream_reset_outstanding) 3628 asoc->stream_reset_outstanding--; 3629 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3630 /* Put the new streams into effect */ 3631 stcb->asoc.streamoutcnt += num_stream; 3632 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3633 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3634 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3635 SCTP_STREAM_CHANGE_DENIED); 3636 } else { 3637 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3638 SCTP_STREAM_CHANGE_FAILED); 3639 } 3640 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3641 if (asoc->stream_reset_outstanding) 3642 asoc->stream_reset_outstanding--; 3643 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3644 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3645 SCTP_STREAM_CHANGE_DENIED); 3646 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3647 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3648 SCTP_STREAM_CHANGE_FAILED); 3649 } 3650 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3651 /** 3652 * a) Adopt the new in tsn. 3653 * b) reset the map 3654 * c) Adopt the new out-tsn 3655 */ 3656 struct sctp_stream_reset_response_tsn *resp; 3657 struct sctp_forward_tsn_chunk fwdtsn; 3658 int abort_flag = 0; 3659 3660 if (respin == NULL) { 3661 /* huh ? */ 3662 return (0); 3663 } 3664 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3665 resp = (struct sctp_stream_reset_response_tsn *)respin; 3666 asoc->stream_reset_outstanding--; 3667 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3668 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3669 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3670 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3671 if (abort_flag) { 3672 return (1); 3673 } 3674 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3675 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3676 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3677 } 3678 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3679 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3680 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3681 3682 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3683 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3684 3685 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3686 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3687 3688 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3689 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3690 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3691 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3692 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3693 SCTP_ASSOC_RESET_DENIED); 3694 } else { 3695 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3696 SCTP_ASSOC_RESET_FAILED); 3697 } 3698 } 3699 /* get rid of the request and get the request flags */ 3700 if (asoc->stream_reset_outstanding == 0) { 3701 sctp_clean_up_stream_reset(stcb); 3702 } 3703 } 3704 } 3705 return (0); 3706 } 3707 3708 static void 3709 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3710 struct sctp_tmit_chunk *chk, 3711 struct sctp_stream_reset_in_request *req, int trunc) 3712 { 3713 uint32_t seq; 3714 int len, i; 3715 int number_entries; 3716 uint16_t temp; 3717 3718 /* 3719 * peer wants me to send a str-reset to him for my outgoing seq's if 3720 * seq_in is right. 3721 */ 3722 struct sctp_association *asoc = &stcb->asoc; 3723 3724 seq = ntohl(req->request_seq); 3725 if (asoc->str_reset_seq_in == seq) { 3726 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3727 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3728 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3729 } else if (trunc) { 3730 /* Can't do it, since they exceeded our buffer size */ 3731 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3732 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3733 len = ntohs(req->ph.param_length); 3734 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3735 for (i = 0; i < number_entries; i++) { 3736 temp = ntohs(req->list_of_streams[i]); 3737 req->list_of_streams[i] = temp; 3738 } 3739 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3740 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3741 asoc->str_reset_seq_out, 3742 seq, (asoc->sending_seq - 1)); 3743 asoc->stream_reset_out_is_outstanding = 1; 3744 asoc->str_reset = chk; 3745 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3746 stcb->asoc.stream_reset_outstanding++; 3747 } else { 3748 /* Can't do it, since we have sent one out */ 3749 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3750 } 3751 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3752 asoc->str_reset_seq_in++; 3753 } else if (asoc->str_reset_seq_in - 1 == seq) { 3754 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3755 } else if (asoc->str_reset_seq_in - 2 == seq) { 3756 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3757 } else { 3758 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3759 } 3760 } 3761 3762 static int 3763 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3764 struct sctp_tmit_chunk *chk, 3765 struct sctp_stream_reset_tsn_request *req) 3766 { 3767 /* reset all in and out and update the tsn */ 3768 /* 3769 * A) reset my str-seq's on in and out. B) Select a receive next, 3770 * and set cum-ack to it. Also process this selected number as a 3771 * fwd-tsn as well. C) set in the response my next sending seq. 3772 */ 3773 struct sctp_forward_tsn_chunk fwdtsn; 3774 struct sctp_association *asoc = &stcb->asoc; 3775 int abort_flag = 0; 3776 uint32_t seq; 3777 3778 seq = ntohl(req->request_seq); 3779 if (asoc->str_reset_seq_in == seq) { 3780 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3781 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3782 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3783 } else { 3784 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3785 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3786 fwdtsn.ch.chunk_flags = 0; 3787 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3788 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3789 if (abort_flag) { 3790 return (1); 3791 } 3792 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3793 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3794 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3795 } 3796 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3797 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3798 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3799 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3800 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3801 atomic_add_int(&asoc->sending_seq, 1); 3802 /* save off historical data for retrans */ 3803 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3804 asoc->last_sending_seq[0] = asoc->sending_seq; 3805 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3806 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3807 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3808 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3809 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3810 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3811 } 3812 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3813 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3814 asoc->str_reset_seq_in++; 3815 } else if (asoc->str_reset_seq_in - 1 == seq) { 3816 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3817 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3818 } else if (asoc->str_reset_seq_in - 2 == seq) { 3819 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3820 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3821 } else { 3822 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3823 } 3824 return (0); 3825 } 3826 3827 static void 3828 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3829 struct sctp_tmit_chunk *chk, 3830 struct sctp_stream_reset_out_request *req, int trunc) 3831 { 3832 uint32_t seq, tsn; 3833 int number_entries, len; 3834 struct sctp_association *asoc = &stcb->asoc; 3835 3836 seq = ntohl(req->request_seq); 3837 3838 /* now if its not a duplicate we process it */ 3839 if (asoc->str_reset_seq_in == seq) { 3840 len = ntohs(req->ph.param_length); 3841 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3842 /* 3843 * the sender is resetting, handle the list issue.. we must 3844 * a) verify if we can do the reset, if so no problem b) If 3845 * we can't do the reset we must copy the request. c) queue 3846 * it, and setup the data in processor to trigger it off 3847 * when needed and dequeue all the queued data. 3848 */ 3849 tsn = ntohl(req->send_reset_at_tsn); 3850 3851 /* move the reset action back one */ 3852 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3853 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3855 } else if (trunc) { 3856 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3857 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3858 /* we can do it now */ 3859 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3860 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3861 } else { 3862 /* 3863 * we must queue it up and thus wait for the TSN's 3864 * to arrive that are at or before tsn 3865 */ 3866 struct sctp_stream_reset_list *liste; 3867 int siz; 3868 3869 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3870 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3871 siz, SCTP_M_STRESET); 3872 if (liste == NULL) { 3873 /* gak out of memory */ 3874 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3875 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3876 return; 3877 } 3878 liste->tsn = tsn; 3879 liste->number_entries = number_entries; 3880 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3881 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3882 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3883 } 3884 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3885 asoc->str_reset_seq_in++; 3886 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3887 /* 3888 * one seq back, just echo back last action since my 3889 * response was lost. 3890 */ 3891 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3892 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3893 /* 3894 * two seq back, just echo back last action since my 3895 * response was lost. 3896 */ 3897 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3898 } else { 3899 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3900 } 3901 } 3902 3903 static void 3904 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3905 struct sctp_stream_reset_add_strm *str_add) 3906 { 3907 /* 3908 * Peer is requesting to add more streams. If its within our 3909 * max-streams we will allow it. 3910 */ 3911 uint32_t num_stream, i; 3912 uint32_t seq; 3913 struct sctp_association *asoc = &stcb->asoc; 3914 struct sctp_queued_to_read *ctl, *nctl; 3915 3916 /* Get the number. */ 3917 seq = ntohl(str_add->request_seq); 3918 num_stream = ntohs(str_add->number_of_streams); 3919 /* Now what would be the new total? */ 3920 if (asoc->str_reset_seq_in == seq) { 3921 num_stream += stcb->asoc.streamincnt; 3922 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3923 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3924 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3925 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3926 (num_stream > 0xffff)) { 3927 /* We must reject it they ask for to many */ 3928 denied: 3929 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3930 } else { 3931 /* Ok, we can do that :-) */ 3932 struct sctp_stream_in *oldstrm; 3933 3934 /* save off the old */ 3935 oldstrm = stcb->asoc.strmin; 3936 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3937 (num_stream * sizeof(struct sctp_stream_in)), 3938 SCTP_M_STRMI); 3939 if (stcb->asoc.strmin == NULL) { 3940 stcb->asoc.strmin = oldstrm; 3941 goto denied; 3942 } 3943 /* copy off the old data */ 3944 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3945 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3946 stcb->asoc.strmin[i].stream_no = i; 3947 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3948 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3949 /* now anything on those queues? */ 3950 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3951 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3952 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3953 } 3954 } 3955 /* Init the new streams */ 3956 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3957 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3958 stcb->asoc.strmin[i].stream_no = i; 3959 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3960 stcb->asoc.strmin[i].delivery_started = 0; 3961 } 3962 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3963 /* update the size */ 3964 stcb->asoc.streamincnt = num_stream; 3965 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3966 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3967 } 3968 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3969 asoc->str_reset_seq_in++; 3970 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3971 /* 3972 * one seq back, just echo back last action since my 3973 * response was lost. 3974 */ 3975 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3976 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3977 /* 3978 * two seq back, just echo back last action since my 3979 * response was lost. 3980 */ 3981 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3982 } else { 3983 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3984 3985 } 3986 } 3987 3988 static void 3989 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3990 struct sctp_stream_reset_add_strm *str_add) 3991 { 3992 /* 3993 * Peer is requesting to add more streams. If its within our 3994 * max-streams we will allow it. 3995 */ 3996 uint16_t num_stream; 3997 uint32_t seq; 3998 struct sctp_association *asoc = &stcb->asoc; 3999 4000 /* Get the number. */ 4001 seq = ntohl(str_add->request_seq); 4002 num_stream = ntohs(str_add->number_of_streams); 4003 /* Now what would be the new total? */ 4004 if (asoc->str_reset_seq_in == seq) { 4005 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4006 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4007 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4008 } else if (stcb->asoc.stream_reset_outstanding) { 4009 /* We must reject it we have something pending */ 4010 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4011 } else { 4012 /* Ok, we can do that :-) */ 4013 int mychk; 4014 4015 mychk = stcb->asoc.streamoutcnt; 4016 mychk += num_stream; 4017 if (mychk < 0x10000) { 4018 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4019 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4020 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4021 } 4022 } else { 4023 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4024 } 4025 } 4026 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4027 asoc->str_reset_seq_in++; 4028 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4029 /* 4030 * one seq back, just echo back last action since my 4031 * response was lost. 4032 */ 4033 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4034 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4035 /* 4036 * two seq back, just echo back last action since my 4037 * response was lost. 4038 */ 4039 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4040 } else { 4041 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4042 } 4043 } 4044 4045 #ifdef __GNUC__ 4046 __attribute__((noinline)) 4047 #endif 4048 static int 4049 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4050 struct sctp_chunkhdr *ch_req) 4051 { 4052 int chk_length, param_len, ptype; 4053 struct sctp_paramhdr pstore; 4054 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4055 uint32_t seq = 0; 4056 int num_req = 0; 4057 int trunc = 0; 4058 struct sctp_tmit_chunk *chk; 4059 struct sctp_chunkhdr *ch; 4060 struct sctp_paramhdr *ph; 4061 int ret_code = 0; 4062 int num_param = 0; 4063 4064 /* now it may be a reset or a reset-response */ 4065 chk_length = ntohs(ch_req->chunk_length); 4066 4067 /* setup for adding the response */ 4068 sctp_alloc_a_chunk(stcb, chk); 4069 if (chk == NULL) { 4070 return (ret_code); 4071 } 4072 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4073 chk->rec.chunk_id.can_take_data = 0; 4074 chk->asoc = &stcb->asoc; 4075 chk->no_fr_allowed = 0; 4076 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4077 chk->book_size_scale = 0; 4078 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4079 if (chk->data == NULL) { 4080 strres_nochunk: 4081 if (chk->data) { 4082 sctp_m_freem(chk->data); 4083 chk->data = NULL; 4084 } 4085 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4086 return (ret_code); 4087 } 4088 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4089 4090 /* setup chunk parameters */ 4091 chk->sent = SCTP_DATAGRAM_UNSENT; 4092 chk->snd_count = 0; 4093 chk->whoTo = NULL; 4094 4095 ch = mtod(chk->data, struct sctp_chunkhdr *); 4096 ch->chunk_type = SCTP_STREAM_RESET; 4097 ch->chunk_flags = 0; 4098 ch->chunk_length = htons(chk->send_size); 4099 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4100 offset += sizeof(struct sctp_chunkhdr); 4101 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4102 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4103 if (ph == NULL) 4104 break; 4105 param_len = ntohs(ph->param_length); 4106 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4107 /* bad param */ 4108 break; 4109 } 4110 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4111 (uint8_t *) & cstore); 4112 ptype = ntohs(ph->param_type); 4113 num_param++; 4114 if (param_len > (int)sizeof(cstore)) { 4115 trunc = 1; 4116 } else { 4117 trunc = 0; 4118 } 4119 if (num_param > SCTP_MAX_RESET_PARAMS) { 4120 /* hit the max of parameters already sorry.. */ 4121 break; 4122 } 4123 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4124 struct sctp_stream_reset_out_request *req_out; 4125 4126 req_out = (struct sctp_stream_reset_out_request *)ph; 4127 num_req++; 4128 if (stcb->asoc.stream_reset_outstanding) { 4129 seq = ntohl(req_out->response_seq); 4130 if (seq == stcb->asoc.str_reset_seq_out) { 4131 /* implicit ack */ 4132 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4133 } 4134 } 4135 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4136 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4137 struct sctp_stream_reset_add_strm *str_add; 4138 4139 str_add = (struct sctp_stream_reset_add_strm *)ph; 4140 num_req++; 4141 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4142 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4143 struct sctp_stream_reset_add_strm *str_add; 4144 4145 str_add = (struct sctp_stream_reset_add_strm *)ph; 4146 num_req++; 4147 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4148 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4149 struct sctp_stream_reset_in_request *req_in; 4150 4151 num_req++; 4152 req_in = (struct sctp_stream_reset_in_request *)ph; 4153 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4154 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4155 struct sctp_stream_reset_tsn_request *req_tsn; 4156 4157 num_req++; 4158 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4159 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4160 ret_code = 1; 4161 goto strres_nochunk; 4162 } 4163 /* no more */ 4164 break; 4165 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4166 struct sctp_stream_reset_response *resp; 4167 uint32_t result; 4168 4169 resp = (struct sctp_stream_reset_response *)ph; 4170 seq = ntohl(resp->response_seq); 4171 result = ntohl(resp->result); 4172 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4173 ret_code = 1; 4174 goto strres_nochunk; 4175 } 4176 } else { 4177 break; 4178 } 4179 offset += SCTP_SIZE32(param_len); 4180 chk_length -= SCTP_SIZE32(param_len); 4181 } 4182 if (num_req == 0) { 4183 /* we have no response free the stuff */ 4184 goto strres_nochunk; 4185 } 4186 /* ok we have a chunk to link in */ 4187 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4188 chk, 4189 sctp_next); 4190 stcb->asoc.ctrl_queue_cnt++; 4191 return (ret_code); 4192 } 4193 4194 /* 4195 * Handle a router or endpoints report of a packet loss, there are two ways 4196 * to handle this, either we get the whole packet and must disect it 4197 * ourselves (possibly with truncation and or corruption) or it is a summary 4198 * from a middle box that did the disectting for us. 4199 */ 4200 static void 4201 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4202 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4203 { 4204 uint32_t bottle_bw, on_queue; 4205 uint16_t trunc_len; 4206 unsigned int chlen; 4207 unsigned int at; 4208 struct sctp_chunk_desc desc; 4209 struct sctp_chunkhdr *ch; 4210 4211 chlen = ntohs(cp->ch.chunk_length); 4212 chlen -= sizeof(struct sctp_pktdrop_chunk); 4213 /* XXX possible chlen underflow */ 4214 if (chlen == 0) { 4215 ch = NULL; 4216 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4217 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4218 } else { 4219 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4220 chlen -= sizeof(struct sctphdr); 4221 /* XXX possible chlen underflow */ 4222 memset(&desc, 0, sizeof(desc)); 4223 } 4224 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4225 if (trunc_len > limit) { 4226 trunc_len = limit; 4227 } 4228 /* now the chunks themselves */ 4229 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4230 desc.chunk_type = ch->chunk_type; 4231 /* get amount we need to move */ 4232 at = ntohs(ch->chunk_length); 4233 if (at < sizeof(struct sctp_chunkhdr)) { 4234 /* corrupt chunk, maybe at the end? */ 4235 SCTP_STAT_INCR(sctps_pdrpcrupt); 4236 break; 4237 } 4238 if (trunc_len == 0) { 4239 /* we are supposed to have all of it */ 4240 if (at > chlen) { 4241 /* corrupt skip it */ 4242 SCTP_STAT_INCR(sctps_pdrpcrupt); 4243 break; 4244 } 4245 } else { 4246 /* is there enough of it left ? */ 4247 if (desc.chunk_type == SCTP_DATA) { 4248 if (chlen < (sizeof(struct sctp_data_chunk) + 4249 sizeof(desc.data_bytes))) { 4250 break; 4251 } 4252 } else { 4253 if (chlen < sizeof(struct sctp_chunkhdr)) { 4254 break; 4255 } 4256 } 4257 } 4258 if (desc.chunk_type == SCTP_DATA) { 4259 /* can we get out the tsn? */ 4260 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4261 SCTP_STAT_INCR(sctps_pdrpmbda); 4262 4263 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4264 /* yep */ 4265 struct sctp_data_chunk *dcp; 4266 uint8_t *ddp; 4267 unsigned int iii; 4268 4269 dcp = (struct sctp_data_chunk *)ch; 4270 ddp = (uint8_t *) (dcp + 1); 4271 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4272 desc.data_bytes[iii] = ddp[iii]; 4273 } 4274 desc.tsn_ifany = dcp->dp.tsn; 4275 } else { 4276 /* nope we are done. */ 4277 SCTP_STAT_INCR(sctps_pdrpnedat); 4278 break; 4279 } 4280 } else { 4281 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4282 SCTP_STAT_INCR(sctps_pdrpmbct); 4283 } 4284 4285 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4286 SCTP_STAT_INCR(sctps_pdrppdbrk); 4287 break; 4288 } 4289 if (SCTP_SIZE32(at) > chlen) { 4290 break; 4291 } 4292 chlen -= SCTP_SIZE32(at); 4293 if (chlen < sizeof(struct sctp_chunkhdr)) { 4294 /* done, none left */ 4295 break; 4296 } 4297 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4298 } 4299 /* Now update any rwnd --- possibly */ 4300 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4301 /* From a peer, we get a rwnd report */ 4302 uint32_t a_rwnd; 4303 4304 SCTP_STAT_INCR(sctps_pdrpfehos); 4305 4306 bottle_bw = ntohl(cp->bottle_bw); 4307 on_queue = ntohl(cp->current_onq); 4308 if (bottle_bw && on_queue) { 4309 /* a rwnd report is in here */ 4310 if (bottle_bw > on_queue) 4311 a_rwnd = bottle_bw - on_queue; 4312 else 4313 a_rwnd = 0; 4314 4315 if (a_rwnd == 0) 4316 stcb->asoc.peers_rwnd = 0; 4317 else { 4318 if (a_rwnd > stcb->asoc.total_flight) { 4319 stcb->asoc.peers_rwnd = 4320 a_rwnd - stcb->asoc.total_flight; 4321 } else { 4322 stcb->asoc.peers_rwnd = 0; 4323 } 4324 if (stcb->asoc.peers_rwnd < 4325 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4326 /* SWS sender side engages */ 4327 stcb->asoc.peers_rwnd = 0; 4328 } 4329 } 4330 } 4331 } else { 4332 SCTP_STAT_INCR(sctps_pdrpfmbox); 4333 } 4334 4335 /* now middle boxes in sat networks get a cwnd bump */ 4336 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4337 (stcb->asoc.sat_t3_loss_recovery == 0) && 4338 (stcb->asoc.sat_network)) { 4339 /* 4340 * This is debateable but for sat networks it makes sense 4341 * Note if a T3 timer has went off, we will prohibit any 4342 * changes to cwnd until we exit the t3 loss recovery. 4343 */ 4344 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4345 net, cp, &bottle_bw, &on_queue); 4346 } 4347 } 4348 4349 /* 4350 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4351 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4352 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4353 * length of the complete packet outputs: - length: modified to remaining 4354 * length after control processing - netp: modified to new sctp_nets after 4355 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4356 * bad packet,...) otherwise return the tcb for this packet 4357 */ 4358 #ifdef __GNUC__ 4359 __attribute__((noinline)) 4360 #endif 4361 static struct sctp_tcb * 4362 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4363 struct sockaddr *src, struct sockaddr *dst, 4364 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4365 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4366 uint8_t use_mflowid, uint32_t mflowid, 4367 uint32_t vrf_id, uint16_t port) 4368 { 4369 struct sctp_association *asoc; 4370 struct mbuf *op_err; 4371 char msg[SCTP_DIAG_INFO_LEN]; 4372 uint32_t vtag_in; 4373 int num_chunks = 0; /* number of control chunks processed */ 4374 uint32_t chk_length; 4375 int ret; 4376 int abort_no_unlock = 0; 4377 int ecne_seen = 0; 4378 4379 /* 4380 * How big should this be, and should it be alloc'd? Lets try the 4381 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4382 * until we get into jumbo grams and such.. 4383 */ 4384 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4385 struct sctp_tcb *locked_tcb = stcb; 4386 int got_auth = 0; 4387 uint32_t auth_offset = 0, auth_len = 0; 4388 int auth_skipped = 0; 4389 int asconf_cnt = 0; 4390 4391 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4392 struct socket *so; 4393 4394 #endif 4395 4396 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4397 iphlen, *offset, length, (void *)stcb); 4398 4399 /* validate chunk header length... */ 4400 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4401 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4402 ntohs(ch->chunk_length)); 4403 if (locked_tcb) { 4404 SCTP_TCB_UNLOCK(locked_tcb); 4405 } 4406 return (NULL); 4407 } 4408 /* 4409 * validate the verification tag 4410 */ 4411 vtag_in = ntohl(sh->v_tag); 4412 4413 if (locked_tcb) { 4414 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4415 } 4416 if (ch->chunk_type == SCTP_INITIATION) { 4417 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4418 ntohs(ch->chunk_length), vtag_in); 4419 if (vtag_in != 0) { 4420 /* protocol error- silently discard... */ 4421 SCTP_STAT_INCR(sctps_badvtag); 4422 if (locked_tcb) { 4423 SCTP_TCB_UNLOCK(locked_tcb); 4424 } 4425 return (NULL); 4426 } 4427 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4428 /* 4429 * If there is no stcb, skip the AUTH chunk and process 4430 * later after a stcb is found (to validate the lookup was 4431 * valid. 4432 */ 4433 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4434 (stcb == NULL) && 4435 (inp->auth_supported == 1)) { 4436 /* save this chunk for later processing */ 4437 auth_skipped = 1; 4438 auth_offset = *offset; 4439 auth_len = ntohs(ch->chunk_length); 4440 4441 /* (temporarily) move past this chunk */ 4442 *offset += SCTP_SIZE32(auth_len); 4443 if (*offset >= length) { 4444 /* no more data left in the mbuf chain */ 4445 *offset = length; 4446 if (locked_tcb) { 4447 SCTP_TCB_UNLOCK(locked_tcb); 4448 } 4449 return (NULL); 4450 } 4451 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4452 sizeof(struct sctp_chunkhdr), chunk_buf); 4453 } 4454 if (ch == NULL) { 4455 /* Help */ 4456 *offset = length; 4457 if (locked_tcb) { 4458 SCTP_TCB_UNLOCK(locked_tcb); 4459 } 4460 return (NULL); 4461 } 4462 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4463 goto process_control_chunks; 4464 } 4465 /* 4466 * first check if it's an ASCONF with an unknown src addr we 4467 * need to look inside to find the association 4468 */ 4469 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4470 struct sctp_chunkhdr *asconf_ch = ch; 4471 uint32_t asconf_offset = 0, asconf_len = 0; 4472 4473 /* inp's refcount may be reduced */ 4474 SCTP_INP_INCR_REF(inp); 4475 4476 asconf_offset = *offset; 4477 do { 4478 asconf_len = ntohs(asconf_ch->chunk_length); 4479 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4480 break; 4481 stcb = sctp_findassociation_ep_asconf(m, 4482 *offset, 4483 dst, 4484 sh, &inp, netp, vrf_id); 4485 if (stcb != NULL) 4486 break; 4487 asconf_offset += SCTP_SIZE32(asconf_len); 4488 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4489 sizeof(struct sctp_chunkhdr), chunk_buf); 4490 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4491 if (stcb == NULL) { 4492 /* 4493 * reduce inp's refcount if not reduced in 4494 * sctp_findassociation_ep_asconf(). 4495 */ 4496 SCTP_INP_DECR_REF(inp); 4497 } else { 4498 locked_tcb = stcb; 4499 } 4500 4501 /* now go back and verify any auth chunk to be sure */ 4502 if (auth_skipped && (stcb != NULL)) { 4503 struct sctp_auth_chunk *auth; 4504 4505 auth = (struct sctp_auth_chunk *) 4506 sctp_m_getptr(m, auth_offset, 4507 auth_len, chunk_buf); 4508 got_auth = 1; 4509 auth_skipped = 0; 4510 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4511 auth_offset)) { 4512 /* auth HMAC failed so dump it */ 4513 *offset = length; 4514 if (locked_tcb) { 4515 SCTP_TCB_UNLOCK(locked_tcb); 4516 } 4517 return (NULL); 4518 } else { 4519 /* remaining chunks are HMAC checked */ 4520 stcb->asoc.authenticated = 1; 4521 } 4522 } 4523 } 4524 if (stcb == NULL) { 4525 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4526 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4527 msg); 4528 /* no association, so it's out of the blue... */ 4529 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4530 use_mflowid, mflowid, 4531 vrf_id, port); 4532 *offset = length; 4533 if (locked_tcb) { 4534 SCTP_TCB_UNLOCK(locked_tcb); 4535 } 4536 return (NULL); 4537 } 4538 asoc = &stcb->asoc; 4539 /* ABORT and SHUTDOWN can use either v_tag... */ 4540 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4541 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4542 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4543 /* Take the T-bit always into account. */ 4544 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4545 (vtag_in == asoc->my_vtag)) || 4546 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4547 (vtag_in == asoc->peer_vtag))) { 4548 /* this is valid */ 4549 } else { 4550 /* drop this packet... */ 4551 SCTP_STAT_INCR(sctps_badvtag); 4552 if (locked_tcb) { 4553 SCTP_TCB_UNLOCK(locked_tcb); 4554 } 4555 return (NULL); 4556 } 4557 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4558 if (vtag_in != asoc->my_vtag) { 4559 /* 4560 * this could be a stale SHUTDOWN-ACK or the 4561 * peer never got the SHUTDOWN-COMPLETE and 4562 * is still hung; we have started a new asoc 4563 * but it won't complete until the shutdown 4564 * is completed 4565 */ 4566 if (locked_tcb) { 4567 SCTP_TCB_UNLOCK(locked_tcb); 4568 } 4569 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4570 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4571 msg); 4572 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4573 sh, inp, op_err, 4574 use_mflowid, mflowid, 4575 vrf_id, port); 4576 return (NULL); 4577 } 4578 } else { 4579 /* for all other chunks, vtag must match */ 4580 if (vtag_in != asoc->my_vtag) { 4581 /* invalid vtag... */ 4582 SCTPDBG(SCTP_DEBUG_INPUT3, 4583 "invalid vtag: %xh, expect %xh\n", 4584 vtag_in, asoc->my_vtag); 4585 SCTP_STAT_INCR(sctps_badvtag); 4586 if (locked_tcb) { 4587 SCTP_TCB_UNLOCK(locked_tcb); 4588 } 4589 *offset = length; 4590 return (NULL); 4591 } 4592 } 4593 } /* end if !SCTP_COOKIE_ECHO */ 4594 /* 4595 * process all control chunks... 4596 */ 4597 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4598 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4599 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4600 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4601 /* implied cookie-ack.. we must have lost the ack */ 4602 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4603 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4604 stcb->asoc.overall_error_count, 4605 0, 4606 SCTP_FROM_SCTP_INPUT, 4607 __LINE__); 4608 } 4609 stcb->asoc.overall_error_count = 0; 4610 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4611 *netp); 4612 } 4613 process_control_chunks: 4614 while (IS_SCTP_CONTROL(ch)) { 4615 /* validate chunk length */ 4616 chk_length = ntohs(ch->chunk_length); 4617 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4618 ch->chunk_type, chk_length); 4619 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4620 if (chk_length < sizeof(*ch) || 4621 (*offset + (int)chk_length) > length) { 4622 *offset = length; 4623 if (locked_tcb) { 4624 SCTP_TCB_UNLOCK(locked_tcb); 4625 } 4626 return (NULL); 4627 } 4628 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4629 /* 4630 * INIT-ACK only gets the init ack "header" portion only 4631 * because we don't have to process the peer's COOKIE. All 4632 * others get a complete chunk. 4633 */ 4634 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4635 (ch->chunk_type == SCTP_INITIATION)) { 4636 /* get an init-ack chunk */ 4637 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4638 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4639 if (ch == NULL) { 4640 *offset = length; 4641 if (locked_tcb) { 4642 SCTP_TCB_UNLOCK(locked_tcb); 4643 } 4644 return (NULL); 4645 } 4646 } else { 4647 /* For cookies and all other chunks. */ 4648 if (chk_length > sizeof(chunk_buf)) { 4649 /* 4650 * use just the size of the chunk buffer so 4651 * the front part of our chunks fit in 4652 * contiguous space up to the chunk buffer 4653 * size (508 bytes). For chunks that need to 4654 * get more than that they must use the 4655 * sctp_m_getptr() function or other means 4656 * (e.g. know how to parse mbuf chains). 4657 * Cookies do this already. 4658 */ 4659 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4660 (sizeof(chunk_buf) - 4), 4661 chunk_buf); 4662 if (ch == NULL) { 4663 *offset = length; 4664 if (locked_tcb) { 4665 SCTP_TCB_UNLOCK(locked_tcb); 4666 } 4667 return (NULL); 4668 } 4669 } else { 4670 /* We can fit it all */ 4671 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4672 chk_length, chunk_buf); 4673 if (ch == NULL) { 4674 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4675 *offset = length; 4676 if (locked_tcb) { 4677 SCTP_TCB_UNLOCK(locked_tcb); 4678 } 4679 return (NULL); 4680 } 4681 } 4682 } 4683 num_chunks++; 4684 /* Save off the last place we got a control from */ 4685 if (stcb != NULL) { 4686 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4687 /* 4688 * allow last_control to be NULL if 4689 * ASCONF... ASCONF processing will find the 4690 * right net later 4691 */ 4692 if ((netp != NULL) && (*netp != NULL)) 4693 stcb->asoc.last_control_chunk_from = *netp; 4694 } 4695 } 4696 #ifdef SCTP_AUDITING_ENABLED 4697 sctp_audit_log(0xB0, ch->chunk_type); 4698 #endif 4699 4700 /* check to see if this chunk required auth, but isn't */ 4701 if ((stcb != NULL) && 4702 (stcb->asoc.auth_supported == 1) && 4703 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4704 !stcb->asoc.authenticated) { 4705 /* "silently" ignore */ 4706 SCTP_STAT_INCR(sctps_recvauthmissing); 4707 goto next_chunk; 4708 } 4709 switch (ch->chunk_type) { 4710 case SCTP_INITIATION: 4711 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4712 /* The INIT chunk must be the only chunk. */ 4713 if ((num_chunks > 1) || 4714 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4715 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4716 "INIT not the only chunk"); 4717 sctp_abort_association(inp, stcb, m, iphlen, 4718 src, dst, sh, op_err, 4719 use_mflowid, mflowid, 4720 vrf_id, port); 4721 *offset = length; 4722 return (NULL); 4723 } 4724 /* Honor our resource limit. */ 4725 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4726 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4727 sctp_abort_association(inp, stcb, m, iphlen, 4728 src, dst, sh, op_err, 4729 use_mflowid, mflowid, 4730 vrf_id, port); 4731 *offset = length; 4732 return (NULL); 4733 } 4734 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4735 (struct sctp_init_chunk *)ch, inp, 4736 stcb, &abort_no_unlock, 4737 use_mflowid, mflowid, 4738 vrf_id, port); 4739 *offset = length; 4740 if ((!abort_no_unlock) && (locked_tcb)) { 4741 SCTP_TCB_UNLOCK(locked_tcb); 4742 } 4743 return (NULL); 4744 break; 4745 case SCTP_PAD_CHUNK: 4746 break; 4747 case SCTP_INITIATION_ACK: 4748 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4749 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4750 /* We are not interested anymore */ 4751 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4752 ; 4753 } else { 4754 if (locked_tcb != stcb) { 4755 /* Very unlikely */ 4756 SCTP_TCB_UNLOCK(locked_tcb); 4757 } 4758 *offset = length; 4759 if (stcb) { 4760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4761 so = SCTP_INP_SO(inp); 4762 atomic_add_int(&stcb->asoc.refcnt, 1); 4763 SCTP_TCB_UNLOCK(stcb); 4764 SCTP_SOCKET_LOCK(so, 1); 4765 SCTP_TCB_LOCK(stcb); 4766 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4767 #endif 4768 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4769 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4770 SCTP_SOCKET_UNLOCK(so, 1); 4771 #endif 4772 } 4773 return (NULL); 4774 } 4775 } 4776 /* The INIT-ACK chunk must be the only chunk. */ 4777 if ((num_chunks > 1) || 4778 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4779 *offset = length; 4780 if (locked_tcb) { 4781 SCTP_TCB_UNLOCK(locked_tcb); 4782 } 4783 return (NULL); 4784 } 4785 if ((netp) && (*netp)) { 4786 ret = sctp_handle_init_ack(m, iphlen, *offset, 4787 src, dst, sh, 4788 (struct sctp_init_ack_chunk *)ch, 4789 stcb, *netp, 4790 &abort_no_unlock, 4791 use_mflowid, mflowid, 4792 vrf_id); 4793 } else { 4794 ret = -1; 4795 } 4796 *offset = length; 4797 if (abort_no_unlock) { 4798 return (NULL); 4799 } 4800 /* 4801 * Special case, I must call the output routine to 4802 * get the cookie echoed 4803 */ 4804 if ((stcb != NULL) && (ret == 0)) { 4805 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4806 } 4807 if (locked_tcb) { 4808 SCTP_TCB_UNLOCK(locked_tcb); 4809 } 4810 return (NULL); 4811 break; 4812 case SCTP_SELECTIVE_ACK: 4813 { 4814 struct sctp_sack_chunk *sack; 4815 int abort_now = 0; 4816 uint32_t a_rwnd, cum_ack; 4817 uint16_t num_seg, num_dup; 4818 uint8_t flags; 4819 int offset_seg, offset_dup; 4820 4821 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4822 SCTP_STAT_INCR(sctps_recvsacks); 4823 if (stcb == NULL) { 4824 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4825 break; 4826 } 4827 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4828 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4829 break; 4830 } 4831 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4832 /*- 4833 * If we have sent a shutdown-ack, we will pay no 4834 * attention to a sack sent in to us since 4835 * we don't care anymore. 4836 */ 4837 break; 4838 } 4839 sack = (struct sctp_sack_chunk *)ch; 4840 flags = ch->chunk_flags; 4841 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4842 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4843 num_dup = ntohs(sack->sack.num_dup_tsns); 4844 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4845 if (sizeof(struct sctp_sack_chunk) + 4846 num_seg * sizeof(struct sctp_gap_ack_block) + 4847 num_dup * sizeof(uint32_t) != chk_length) { 4848 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4849 break; 4850 } 4851 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4852 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4853 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4854 cum_ack, num_seg, a_rwnd); 4855 stcb->asoc.seen_a_sack_this_pkt = 1; 4856 if ((stcb->asoc.pr_sctp_cnt == 0) && 4857 (num_seg == 0) && 4858 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4859 (stcb->asoc.saw_sack_with_frags == 0) && 4860 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4861 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4862 ) { 4863 /* 4864 * We have a SIMPLE sack having no 4865 * prior segments and data on sent 4866 * queue to be acked.. Use the 4867 * faster path sack processing. We 4868 * also allow window update sacks 4869 * with no missing segments to go 4870 * this way too. 4871 */ 4872 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4873 } else { 4874 if (netp && *netp) 4875 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4876 num_seg, 0, num_dup, &abort_now, flags, 4877 cum_ack, a_rwnd, ecne_seen); 4878 } 4879 if (abort_now) { 4880 /* ABORT signal from sack processing */ 4881 *offset = length; 4882 return (NULL); 4883 } 4884 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4885 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4886 (stcb->asoc.stream_queue_cnt == 0)) { 4887 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4888 } 4889 } 4890 break; 4891 /* 4892 * EY - nr_sack: If the received chunk is an 4893 * nr_sack chunk 4894 */ 4895 case SCTP_NR_SELECTIVE_ACK: 4896 { 4897 struct sctp_nr_sack_chunk *nr_sack; 4898 int abort_now = 0; 4899 uint32_t a_rwnd, cum_ack; 4900 uint16_t num_seg, num_nr_seg, num_dup; 4901 uint8_t flags; 4902 int offset_seg, offset_dup; 4903 4904 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4905 SCTP_STAT_INCR(sctps_recvsacks); 4906 if (stcb == NULL) { 4907 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4908 break; 4909 } 4910 if (stcb->asoc.nrsack_supported == 0) { 4911 goto unknown_chunk; 4912 } 4913 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4914 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4915 break; 4916 } 4917 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4918 /*- 4919 * If we have sent a shutdown-ack, we will pay no 4920 * attention to a sack sent in to us since 4921 * we don't care anymore. 4922 */ 4923 break; 4924 } 4925 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4926 flags = ch->chunk_flags; 4927 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4928 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4929 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4930 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4931 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4932 if (sizeof(struct sctp_nr_sack_chunk) + 4933 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4934 num_dup * sizeof(uint32_t) != chk_length) { 4935 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4936 break; 4937 } 4938 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4939 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4940 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4941 cum_ack, num_seg, a_rwnd); 4942 stcb->asoc.seen_a_sack_this_pkt = 1; 4943 if ((stcb->asoc.pr_sctp_cnt == 0) && 4944 (num_seg == 0) && (num_nr_seg == 0) && 4945 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4946 (stcb->asoc.saw_sack_with_frags == 0) && 4947 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4948 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4949 /* 4950 * We have a SIMPLE sack having no 4951 * prior segments and data on sent 4952 * queue to be acked. Use the faster 4953 * path sack processing. We also 4954 * allow window update sacks with no 4955 * missing segments to go this way 4956 * too. 4957 */ 4958 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4959 &abort_now, ecne_seen); 4960 } else { 4961 if (netp && *netp) 4962 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4963 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4964 cum_ack, a_rwnd, ecne_seen); 4965 } 4966 if (abort_now) { 4967 /* ABORT signal from sack processing */ 4968 *offset = length; 4969 return (NULL); 4970 } 4971 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4972 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4973 (stcb->asoc.stream_queue_cnt == 0)) { 4974 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4975 } 4976 } 4977 break; 4978 4979 case SCTP_HEARTBEAT_REQUEST: 4980 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4981 if ((stcb) && netp && *netp) { 4982 SCTP_STAT_INCR(sctps_recvheartbeat); 4983 sctp_send_heartbeat_ack(stcb, m, *offset, 4984 chk_length, *netp); 4985 4986 /* He's alive so give him credit */ 4987 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4988 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4989 stcb->asoc.overall_error_count, 4990 0, 4991 SCTP_FROM_SCTP_INPUT, 4992 __LINE__); 4993 } 4994 stcb->asoc.overall_error_count = 0; 4995 } 4996 break; 4997 case SCTP_HEARTBEAT_ACK: 4998 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4999 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5000 /* Its not ours */ 5001 *offset = length; 5002 if (locked_tcb) { 5003 SCTP_TCB_UNLOCK(locked_tcb); 5004 } 5005 return (NULL); 5006 } 5007 /* He's alive so give him credit */ 5008 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5009 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5010 stcb->asoc.overall_error_count, 5011 0, 5012 SCTP_FROM_SCTP_INPUT, 5013 __LINE__); 5014 } 5015 stcb->asoc.overall_error_count = 0; 5016 SCTP_STAT_INCR(sctps_recvheartbeatack); 5017 if (netp && *netp) 5018 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5019 stcb, *netp); 5020 break; 5021 case SCTP_ABORT_ASSOCIATION: 5022 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5023 (void *)stcb); 5024 if ((stcb) && netp && *netp) 5025 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5026 stcb, *netp); 5027 *offset = length; 5028 return (NULL); 5029 break; 5030 case SCTP_SHUTDOWN: 5031 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5032 (void *)stcb); 5033 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5034 *offset = length; 5035 if (locked_tcb) { 5036 SCTP_TCB_UNLOCK(locked_tcb); 5037 } 5038 return (NULL); 5039 } 5040 if (netp && *netp) { 5041 int abort_flag = 0; 5042 5043 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5044 stcb, *netp, &abort_flag); 5045 if (abort_flag) { 5046 *offset = length; 5047 return (NULL); 5048 } 5049 } 5050 break; 5051 case SCTP_SHUTDOWN_ACK: 5052 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5053 if ((stcb) && (netp) && (*netp)) 5054 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5055 *offset = length; 5056 return (NULL); 5057 break; 5058 5059 case SCTP_OPERATION_ERROR: 5060 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5061 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5062 *offset = length; 5063 return (NULL); 5064 } 5065 break; 5066 case SCTP_COOKIE_ECHO: 5067 SCTPDBG(SCTP_DEBUG_INPUT3, 5068 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5069 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5070 ; 5071 } else { 5072 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5073 /* We are not interested anymore */ 5074 abend: 5075 if (stcb) { 5076 SCTP_TCB_UNLOCK(stcb); 5077 } 5078 *offset = length; 5079 return (NULL); 5080 } 5081 } 5082 /* 5083 * First are we accepting? We do this again here 5084 * since it is possible that a previous endpoint WAS 5085 * listening responded to a INIT-ACK and then 5086 * closed. We opened and bound.. and are now no 5087 * longer listening. 5088 */ 5089 5090 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5091 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5092 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5093 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5094 sctp_abort_association(inp, stcb, m, iphlen, 5095 src, dst, sh, op_err, 5096 use_mflowid, mflowid, 5097 vrf_id, port); 5098 } 5099 *offset = length; 5100 return (NULL); 5101 } else { 5102 struct mbuf *ret_buf; 5103 struct sctp_inpcb *linp; 5104 5105 if (stcb) { 5106 linp = NULL; 5107 } else { 5108 linp = inp; 5109 } 5110 5111 if (linp) { 5112 SCTP_ASOC_CREATE_LOCK(linp); 5113 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5114 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5115 SCTP_ASOC_CREATE_UNLOCK(linp); 5116 goto abend; 5117 } 5118 } 5119 if (netp) { 5120 ret_buf = 5121 sctp_handle_cookie_echo(m, iphlen, 5122 *offset, 5123 src, dst, 5124 sh, 5125 (struct sctp_cookie_echo_chunk *)ch, 5126 &inp, &stcb, netp, 5127 auth_skipped, 5128 auth_offset, 5129 auth_len, 5130 &locked_tcb, 5131 use_mflowid, 5132 mflowid, 5133 vrf_id, 5134 port); 5135 } else { 5136 ret_buf = NULL; 5137 } 5138 if (linp) { 5139 SCTP_ASOC_CREATE_UNLOCK(linp); 5140 } 5141 if (ret_buf == NULL) { 5142 if (locked_tcb) { 5143 SCTP_TCB_UNLOCK(locked_tcb); 5144 } 5145 SCTPDBG(SCTP_DEBUG_INPUT3, 5146 "GAK, null buffer\n"); 5147 *offset = length; 5148 return (NULL); 5149 } 5150 /* if AUTH skipped, see if it verified... */ 5151 if (auth_skipped) { 5152 got_auth = 1; 5153 auth_skipped = 0; 5154 } 5155 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5156 /* 5157 * Restart the timer if we have 5158 * pending data 5159 */ 5160 struct sctp_tmit_chunk *chk; 5161 5162 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5163 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5164 } 5165 } 5166 break; 5167 case SCTP_COOKIE_ACK: 5168 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5169 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5170 if (locked_tcb) { 5171 SCTP_TCB_UNLOCK(locked_tcb); 5172 } 5173 return (NULL); 5174 } 5175 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5176 /* We are not interested anymore */ 5177 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5178 ; 5179 } else if (stcb) { 5180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5181 so = SCTP_INP_SO(inp); 5182 atomic_add_int(&stcb->asoc.refcnt, 1); 5183 SCTP_TCB_UNLOCK(stcb); 5184 SCTP_SOCKET_LOCK(so, 1); 5185 SCTP_TCB_LOCK(stcb); 5186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5187 #endif 5188 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5189 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5190 SCTP_SOCKET_UNLOCK(so, 1); 5191 #endif 5192 *offset = length; 5193 return (NULL); 5194 } 5195 } 5196 /* He's alive so give him credit */ 5197 if ((stcb) && netp && *netp) { 5198 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5199 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5200 stcb->asoc.overall_error_count, 5201 0, 5202 SCTP_FROM_SCTP_INPUT, 5203 __LINE__); 5204 } 5205 stcb->asoc.overall_error_count = 0; 5206 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5207 } 5208 break; 5209 case SCTP_ECN_ECHO: 5210 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5211 /* He's alive so give him credit */ 5212 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5213 /* Its not ours */ 5214 if (locked_tcb) { 5215 SCTP_TCB_UNLOCK(locked_tcb); 5216 } 5217 *offset = length; 5218 return (NULL); 5219 } 5220 if (stcb) { 5221 if (stcb->asoc.ecn_supported == 0) { 5222 goto unknown_chunk; 5223 } 5224 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5225 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5226 stcb->asoc.overall_error_count, 5227 0, 5228 SCTP_FROM_SCTP_INPUT, 5229 __LINE__); 5230 } 5231 stcb->asoc.overall_error_count = 0; 5232 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5233 stcb); 5234 ecne_seen = 1; 5235 } 5236 break; 5237 case SCTP_ECN_CWR: 5238 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5239 /* He's alive so give him credit */ 5240 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5241 /* Its not ours */ 5242 if (locked_tcb) { 5243 SCTP_TCB_UNLOCK(locked_tcb); 5244 } 5245 *offset = length; 5246 return (NULL); 5247 } 5248 if (stcb) { 5249 if (stcb->asoc.ecn_supported == 0) { 5250 goto unknown_chunk; 5251 } 5252 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5253 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5254 stcb->asoc.overall_error_count, 5255 0, 5256 SCTP_FROM_SCTP_INPUT, 5257 __LINE__); 5258 } 5259 stcb->asoc.overall_error_count = 0; 5260 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5261 } 5262 break; 5263 case SCTP_SHUTDOWN_COMPLETE: 5264 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5265 /* must be first and only chunk */ 5266 if ((num_chunks > 1) || 5267 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5268 *offset = length; 5269 if (locked_tcb) { 5270 SCTP_TCB_UNLOCK(locked_tcb); 5271 } 5272 return (NULL); 5273 } 5274 if ((stcb) && netp && *netp) { 5275 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5276 stcb, *netp); 5277 } 5278 *offset = length; 5279 return (NULL); 5280 break; 5281 case SCTP_ASCONF: 5282 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5283 /* He's alive so give him credit */ 5284 if (stcb) { 5285 if (stcb->asoc.asconf_supported == 0) { 5286 goto unknown_chunk; 5287 } 5288 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5289 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5290 stcb->asoc.overall_error_count, 5291 0, 5292 SCTP_FROM_SCTP_INPUT, 5293 __LINE__); 5294 } 5295 stcb->asoc.overall_error_count = 0; 5296 sctp_handle_asconf(m, *offset, src, 5297 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5298 asconf_cnt++; 5299 } 5300 break; 5301 case SCTP_ASCONF_ACK: 5302 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5303 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5304 /* Its not ours */ 5305 if (locked_tcb) { 5306 SCTP_TCB_UNLOCK(locked_tcb); 5307 } 5308 *offset = length; 5309 return (NULL); 5310 } 5311 if ((stcb) && netp && *netp) { 5312 if (stcb->asoc.asconf_supported == 0) { 5313 goto unknown_chunk; 5314 } 5315 /* He's alive so give him credit */ 5316 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5317 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5318 stcb->asoc.overall_error_count, 5319 0, 5320 SCTP_FROM_SCTP_INPUT, 5321 __LINE__); 5322 } 5323 stcb->asoc.overall_error_count = 0; 5324 sctp_handle_asconf_ack(m, *offset, 5325 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5326 if (abort_no_unlock) 5327 return (NULL); 5328 } 5329 break; 5330 case SCTP_FORWARD_CUM_TSN: 5331 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5332 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5333 /* Its not ours */ 5334 if (locked_tcb) { 5335 SCTP_TCB_UNLOCK(locked_tcb); 5336 } 5337 *offset = length; 5338 return (NULL); 5339 } 5340 /* He's alive so give him credit */ 5341 if (stcb) { 5342 int abort_flag = 0; 5343 5344 if (stcb->asoc.prsctp_supported == 0) { 5345 goto unknown_chunk; 5346 } 5347 stcb->asoc.overall_error_count = 0; 5348 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5349 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5350 stcb->asoc.overall_error_count, 5351 0, 5352 SCTP_FROM_SCTP_INPUT, 5353 __LINE__); 5354 } 5355 *fwd_tsn_seen = 1; 5356 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5357 /* We are not interested anymore */ 5358 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5359 so = SCTP_INP_SO(inp); 5360 atomic_add_int(&stcb->asoc.refcnt, 1); 5361 SCTP_TCB_UNLOCK(stcb); 5362 SCTP_SOCKET_LOCK(so, 1); 5363 SCTP_TCB_LOCK(stcb); 5364 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5365 #endif 5366 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5367 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5368 SCTP_SOCKET_UNLOCK(so, 1); 5369 #endif 5370 *offset = length; 5371 return (NULL); 5372 } 5373 sctp_handle_forward_tsn(stcb, 5374 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5375 if (abort_flag) { 5376 *offset = length; 5377 return (NULL); 5378 } else { 5379 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5380 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5381 stcb->asoc.overall_error_count, 5382 0, 5383 SCTP_FROM_SCTP_INPUT, 5384 __LINE__); 5385 } 5386 stcb->asoc.overall_error_count = 0; 5387 } 5388 5389 } 5390 break; 5391 case SCTP_STREAM_RESET: 5392 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5393 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5394 /* Its not ours */ 5395 if (locked_tcb) { 5396 SCTP_TCB_UNLOCK(locked_tcb); 5397 } 5398 *offset = length; 5399 return (NULL); 5400 } 5401 if (stcb->asoc.reconfig_supported == 0) { 5402 goto unknown_chunk; 5403 } 5404 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5405 /* stop processing */ 5406 *offset = length; 5407 return (NULL); 5408 } 5409 break; 5410 case SCTP_PACKET_DROPPED: 5411 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5412 /* re-get it all please */ 5413 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5414 /* Its not ours */ 5415 if (locked_tcb) { 5416 SCTP_TCB_UNLOCK(locked_tcb); 5417 } 5418 *offset = length; 5419 return (NULL); 5420 } 5421 if (ch && (stcb) && netp && (*netp)) { 5422 if (stcb->asoc.pktdrop_supported == 0) { 5423 goto unknown_chunk; 5424 } 5425 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5426 stcb, *netp, 5427 min(chk_length, (sizeof(chunk_buf) - 4))); 5428 5429 } 5430 break; 5431 case SCTP_AUTHENTICATION: 5432 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5433 if (stcb == NULL) { 5434 /* save the first AUTH for later processing */ 5435 if (auth_skipped == 0) { 5436 auth_offset = *offset; 5437 auth_len = chk_length; 5438 auth_skipped = 1; 5439 } 5440 /* skip this chunk (temporarily) */ 5441 goto next_chunk; 5442 } 5443 if (stcb->asoc.auth_supported == 0) { 5444 goto unknown_chunk; 5445 } 5446 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5447 (chk_length > (sizeof(struct sctp_auth_chunk) + 5448 SCTP_AUTH_DIGEST_LEN_MAX))) { 5449 /* Its not ours */ 5450 if (locked_tcb) { 5451 SCTP_TCB_UNLOCK(locked_tcb); 5452 } 5453 *offset = length; 5454 return (NULL); 5455 } 5456 if (got_auth == 1) { 5457 /* skip this chunk... it's already auth'd */ 5458 goto next_chunk; 5459 } 5460 got_auth = 1; 5461 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5462 m, *offset)) { 5463 /* auth HMAC failed so dump the packet */ 5464 *offset = length; 5465 return (stcb); 5466 } else { 5467 /* remaining chunks are HMAC checked */ 5468 stcb->asoc.authenticated = 1; 5469 } 5470 break; 5471 5472 default: 5473 unknown_chunk: 5474 /* it's an unknown chunk! */ 5475 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5476 struct mbuf *mm; 5477 struct sctp_paramhdr *phd; 5478 5479 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5480 0, M_NOWAIT, 1, MT_DATA); 5481 if (mm) { 5482 phd = mtod(mm, struct sctp_paramhdr *); 5483 /* 5484 * We cheat and use param type since 5485 * we did not bother to define a 5486 * error cause struct. They are the 5487 * same basic format with different 5488 * names. 5489 */ 5490 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5491 phd->param_length = htons(chk_length + sizeof(*phd)); 5492 SCTP_BUF_LEN(mm) = sizeof(*phd); 5493 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 5494 if (SCTP_BUF_NEXT(mm)) { 5495 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) { 5496 sctp_m_freem(mm); 5497 } else { 5498 #ifdef SCTP_MBUF_LOGGING 5499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5500 struct mbuf *mat; 5501 5502 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5503 if (SCTP_BUF_IS_EXTENDED(mat)) { 5504 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5505 } 5506 } 5507 } 5508 #endif 5509 sctp_queue_op_err(stcb, mm); 5510 } 5511 } else { 5512 sctp_m_freem(mm); 5513 } 5514 } 5515 } 5516 if ((ch->chunk_type & 0x80) == 0) { 5517 /* discard this packet */ 5518 *offset = length; 5519 return (stcb); 5520 } /* else skip this bad chunk and continue... */ 5521 break; 5522 } /* switch (ch->chunk_type) */ 5523 5524 5525 next_chunk: 5526 /* get the next chunk */ 5527 *offset += SCTP_SIZE32(chk_length); 5528 if (*offset >= length) { 5529 /* no more data left in the mbuf chain */ 5530 break; 5531 } 5532 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5533 sizeof(struct sctp_chunkhdr), chunk_buf); 5534 if (ch == NULL) { 5535 if (locked_tcb) { 5536 SCTP_TCB_UNLOCK(locked_tcb); 5537 } 5538 *offset = length; 5539 return (NULL); 5540 } 5541 } /* while */ 5542 5543 if (asconf_cnt > 0 && stcb != NULL) { 5544 sctp_send_asconf_ack(stcb); 5545 } 5546 return (stcb); 5547 } 5548 5549 5550 #ifdef INVARIANTS 5551 #ifdef __GNUC__ 5552 __attribute__((noinline)) 5553 #endif 5554 void 5555 sctp_validate_no_locks(struct sctp_inpcb *inp) 5556 { 5557 struct sctp_tcb *lstcb; 5558 5559 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5560 if (mtx_owned(&lstcb->tcb_mtx)) { 5561 panic("Own lock on stcb at return from input"); 5562 } 5563 } 5564 if (mtx_owned(&inp->inp_create_mtx)) { 5565 panic("Own create lock on inp"); 5566 } 5567 if (mtx_owned(&inp->inp_mtx)) { 5568 panic("Own inp lock on inp"); 5569 } 5570 } 5571 5572 #endif 5573 5574 /* 5575 * common input chunk processing (v4 and v6) 5576 */ 5577 void 5578 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5579 struct sockaddr *src, struct sockaddr *dst, 5580 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5581 #if !defined(SCTP_WITH_NO_CSUM) 5582 uint8_t compute_crc, 5583 #endif 5584 uint8_t ecn_bits, 5585 uint8_t use_mflowid, uint32_t mflowid, 5586 uint32_t vrf_id, uint16_t port) 5587 { 5588 uint32_t high_tsn; 5589 int fwd_tsn_seen = 0, data_processed = 0; 5590 struct mbuf *m = *mm, *op_err; 5591 char msg[SCTP_DIAG_INFO_LEN]; 5592 int un_sent; 5593 int cnt_ctrl_ready = 0; 5594 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5595 struct sctp_tcb *stcb = NULL; 5596 struct sctp_nets *net = NULL; 5597 5598 SCTP_STAT_INCR(sctps_recvdatagrams); 5599 #ifdef SCTP_AUDITING_ENABLED 5600 sctp_audit_log(0xE0, 1); 5601 sctp_auditing(0, inp, stcb, net); 5602 #endif 5603 #if !defined(SCTP_WITH_NO_CSUM) 5604 if (compute_crc != 0) { 5605 uint32_t check, calc_check; 5606 5607 check = sh->checksum; 5608 sh->checksum = 0; 5609 calc_check = sctp_calculate_cksum(m, iphlen); 5610 sh->checksum = check; 5611 if (calc_check != check) { 5612 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5613 calc_check, check, (void *)m, length, iphlen); 5614 stcb = sctp_findassociation_addr(m, offset, src, dst, 5615 sh, ch, &inp, &net, vrf_id); 5616 #if defined(INET) || defined(INET6) 5617 if ((net != NULL) && (port != 0)) { 5618 if (net->port == 0) { 5619 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5620 } 5621 net->port = port; 5622 } 5623 #endif 5624 if ((net != NULL) && (use_mflowid != 0)) { 5625 net->flowid = mflowid; 5626 #ifdef INVARIANTS 5627 net->flowidset = 1; 5628 #endif 5629 } 5630 if ((inp != NULL) && (stcb != NULL)) { 5631 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5632 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5633 } else if ((inp != NULL) && (stcb == NULL)) { 5634 inp_decr = inp; 5635 } 5636 SCTP_STAT_INCR(sctps_badsum); 5637 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5638 goto out; 5639 } 5640 } 5641 #endif 5642 /* Destination port of 0 is illegal, based on RFC4960. */ 5643 if (sh->dest_port == 0) { 5644 SCTP_STAT_INCR(sctps_hdrops); 5645 goto out; 5646 } 5647 stcb = sctp_findassociation_addr(m, offset, src, dst, 5648 sh, ch, &inp, &net, vrf_id); 5649 #if defined(INET) || defined(INET6) 5650 if ((net != NULL) && (port != 0)) { 5651 if (net->port == 0) { 5652 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5653 } 5654 net->port = port; 5655 } 5656 #endif 5657 if ((net != NULL) && (use_mflowid != 0)) { 5658 net->flowid = mflowid; 5659 #ifdef INVARIANTS 5660 net->flowidset = 1; 5661 #endif 5662 } 5663 if (inp == NULL) { 5664 SCTP_STAT_INCR(sctps_noport); 5665 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5666 goto out; 5667 } 5668 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5669 sctp_send_shutdown_complete2(src, dst, sh, 5670 use_mflowid, mflowid, 5671 vrf_id, port); 5672 goto out; 5673 } 5674 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5675 goto out; 5676 } 5677 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5678 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5679 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5680 (ch->chunk_type != SCTP_INIT))) { 5681 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5682 "Out of the blue"); 5683 sctp_send_abort(m, iphlen, src, dst, 5684 sh, 0, op_err, 5685 use_mflowid, mflowid, 5686 vrf_id, port); 5687 } 5688 } 5689 goto out; 5690 } else if (stcb == NULL) { 5691 inp_decr = inp; 5692 } 5693 #ifdef IPSEC 5694 /*- 5695 * I very much doubt any of the IPSEC stuff will work but I have no 5696 * idea, so I will leave it in place. 5697 */ 5698 if (inp != NULL) { 5699 switch (dst->sa_family) { 5700 #ifdef INET 5701 case AF_INET: 5702 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5703 IPSECSTAT_INC(ips_in_polvio); 5704 SCTP_STAT_INCR(sctps_hdrops); 5705 goto out; 5706 } 5707 break; 5708 #endif 5709 #ifdef INET6 5710 case AF_INET6: 5711 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5712 IPSEC6STAT_INC(ips_in_polvio); 5713 SCTP_STAT_INCR(sctps_hdrops); 5714 goto out; 5715 } 5716 break; 5717 #endif 5718 default: 5719 break; 5720 } 5721 } 5722 #endif 5723 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5724 (void *)m, iphlen, offset, length, (void *)stcb); 5725 if (stcb) { 5726 /* always clear this before beginning a packet */ 5727 stcb->asoc.authenticated = 0; 5728 stcb->asoc.seen_a_sack_this_pkt = 0; 5729 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5730 (void *)stcb, stcb->asoc.state); 5731 5732 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5733 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5734 /*- 5735 * If we hit here, we had a ref count 5736 * up when the assoc was aborted and the 5737 * timer is clearing out the assoc, we should 5738 * NOT respond to any packet.. its OOTB. 5739 */ 5740 SCTP_TCB_UNLOCK(stcb); 5741 stcb = NULL; 5742 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5743 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5744 msg); 5745 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5746 use_mflowid, mflowid, 5747 vrf_id, port); 5748 goto out; 5749 } 5750 } 5751 if (IS_SCTP_CONTROL(ch)) { 5752 /* process the control portion of the SCTP packet */ 5753 /* sa_ignore NO_NULL_CHK */ 5754 stcb = sctp_process_control(m, iphlen, &offset, length, 5755 src, dst, sh, ch, 5756 inp, stcb, &net, &fwd_tsn_seen, 5757 use_mflowid, mflowid, 5758 vrf_id, port); 5759 if (stcb) { 5760 /* 5761 * This covers us if the cookie-echo was there and 5762 * it changes our INP. 5763 */ 5764 inp = stcb->sctp_ep; 5765 #if defined(INET) || defined(INET6) 5766 if ((net) && (port)) { 5767 if (net->port == 0) { 5768 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5769 } 5770 net->port = port; 5771 } 5772 #endif 5773 } 5774 } else { 5775 /* 5776 * no control chunks, so pre-process DATA chunks (these 5777 * checks are taken care of by control processing) 5778 */ 5779 5780 /* 5781 * if DATA only packet, and auth is required, then punt... 5782 * can't have authenticated without any AUTH (control) 5783 * chunks 5784 */ 5785 if ((stcb != NULL) && 5786 (stcb->asoc.auth_supported == 1) && 5787 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5788 /* "silently" ignore */ 5789 SCTP_STAT_INCR(sctps_recvauthmissing); 5790 goto out; 5791 } 5792 if (stcb == NULL) { 5793 /* out of the blue DATA chunk */ 5794 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5795 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5796 msg); 5797 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5798 use_mflowid, mflowid, 5799 vrf_id, port); 5800 goto out; 5801 } 5802 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5803 /* v_tag mismatch! */ 5804 SCTP_STAT_INCR(sctps_badvtag); 5805 goto out; 5806 } 5807 } 5808 5809 if (stcb == NULL) { 5810 /* 5811 * no valid TCB for this packet, or we found it's a bad 5812 * packet while processing control, or we're done with this 5813 * packet (done or skip rest of data), so we drop it... 5814 */ 5815 goto out; 5816 } 5817 /* 5818 * DATA chunk processing 5819 */ 5820 /* plow through the data chunks while length > offset */ 5821 5822 /* 5823 * Rest should be DATA only. Check authentication state if AUTH for 5824 * DATA is required. 5825 */ 5826 if ((length > offset) && 5827 (stcb != NULL) && 5828 (stcb->asoc.auth_supported == 1) && 5829 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5830 !stcb->asoc.authenticated) { 5831 /* "silently" ignore */ 5832 SCTP_STAT_INCR(sctps_recvauthmissing); 5833 SCTPDBG(SCTP_DEBUG_AUTH1, 5834 "Data chunk requires AUTH, skipped\n"); 5835 goto trigger_send; 5836 } 5837 if (length > offset) { 5838 int retval; 5839 5840 /* 5841 * First check to make sure our state is correct. We would 5842 * not get here unless we really did have a tag, so we don't 5843 * abort if this happens, just dump the chunk silently. 5844 */ 5845 switch (SCTP_GET_STATE(&stcb->asoc)) { 5846 case SCTP_STATE_COOKIE_ECHOED: 5847 /* 5848 * we consider data with valid tags in this state 5849 * shows us the cookie-ack was lost. Imply it was 5850 * there. 5851 */ 5852 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5853 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5854 stcb->asoc.overall_error_count, 5855 0, 5856 SCTP_FROM_SCTP_INPUT, 5857 __LINE__); 5858 } 5859 stcb->asoc.overall_error_count = 0; 5860 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5861 break; 5862 case SCTP_STATE_COOKIE_WAIT: 5863 /* 5864 * We consider OOTB any data sent during asoc setup. 5865 */ 5866 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5867 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5868 msg); 5869 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5870 use_mflowid, mflowid, 5871 vrf_id, port); 5872 goto out; 5873 /* sa_ignore NOTREACHED */ 5874 break; 5875 case SCTP_STATE_EMPTY: /* should not happen */ 5876 case SCTP_STATE_INUSE: /* should not happen */ 5877 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5878 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5879 default: 5880 goto out; 5881 /* sa_ignore NOTREACHED */ 5882 break; 5883 case SCTP_STATE_OPEN: 5884 case SCTP_STATE_SHUTDOWN_SENT: 5885 break; 5886 } 5887 /* plow through the data chunks while length > offset */ 5888 retval = sctp_process_data(mm, iphlen, &offset, length, 5889 src, dst, sh, 5890 inp, stcb, net, &high_tsn, 5891 use_mflowid, mflowid, 5892 vrf_id, port); 5893 if (retval == 2) { 5894 /* 5895 * The association aborted, NO UNLOCK needed since 5896 * the association is destroyed. 5897 */ 5898 stcb = NULL; 5899 goto out; 5900 } 5901 data_processed = 1; 5902 /* 5903 * Anything important needs to have been m_copy'ed in 5904 * process_data 5905 */ 5906 } 5907 /* take care of ecn */ 5908 if ((data_processed == 1) && 5909 (stcb->asoc.ecn_supported == 1) && 5910 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5911 /* Yep, we need to add a ECNE */ 5912 sctp_send_ecn_echo(stcb, net, high_tsn); 5913 } 5914 if ((data_processed == 0) && (fwd_tsn_seen)) { 5915 int was_a_gap; 5916 uint32_t highest_tsn; 5917 5918 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5919 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5920 } else { 5921 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5922 } 5923 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5924 stcb->asoc.send_sack = 1; 5925 sctp_sack_check(stcb, was_a_gap); 5926 } else if (fwd_tsn_seen) { 5927 stcb->asoc.send_sack = 1; 5928 } 5929 /* trigger send of any chunks in queue... */ 5930 trigger_send: 5931 #ifdef SCTP_AUDITING_ENABLED 5932 sctp_audit_log(0xE0, 2); 5933 sctp_auditing(1, inp, stcb, net); 5934 #endif 5935 SCTPDBG(SCTP_DEBUG_INPUT1, 5936 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5937 stcb->asoc.peers_rwnd, 5938 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5939 stcb->asoc.total_flight); 5940 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5941 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5942 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5943 } 5944 if (cnt_ctrl_ready || 5945 ((un_sent) && 5946 (stcb->asoc.peers_rwnd > 0 || 5947 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5948 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5949 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5950 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5951 } 5952 #ifdef SCTP_AUDITING_ENABLED 5953 sctp_audit_log(0xE0, 3); 5954 sctp_auditing(2, inp, stcb, net); 5955 #endif 5956 out: 5957 if (stcb != NULL) { 5958 SCTP_TCB_UNLOCK(stcb); 5959 } 5960 if (inp_decr != NULL) { 5961 /* reduce ref-count */ 5962 SCTP_INP_WLOCK(inp_decr); 5963 SCTP_INP_DECR_REF(inp_decr); 5964 SCTP_INP_WUNLOCK(inp_decr); 5965 } 5966 #ifdef INVARIANTS 5967 if (inp != NULL) { 5968 sctp_validate_no_locks(inp); 5969 } 5970 #endif 5971 return; 5972 } 5973 5974 #if 0 5975 static void 5976 sctp_print_mbuf_chain(struct mbuf *m) 5977 { 5978 for (; m; m = SCTP_BUF_NEXT(m)) { 5979 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5980 if (SCTP_BUF_IS_EXTENDED(m)) 5981 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5982 } 5983 } 5984 5985 #endif 5986 5987 #ifdef INET 5988 void 5989 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5990 { 5991 struct mbuf *m; 5992 int iphlen; 5993 uint32_t vrf_id = 0; 5994 uint8_t ecn_bits; 5995 struct sockaddr_in src, dst; 5996 struct ip *ip; 5997 struct sctphdr *sh; 5998 struct sctp_chunkhdr *ch; 5999 int length, offset; 6000 6001 #if !defined(SCTP_WITH_NO_CSUM) 6002 uint8_t compute_crc; 6003 6004 #endif 6005 uint32_t mflowid; 6006 uint8_t use_mflowid; 6007 6008 iphlen = off; 6009 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6010 SCTP_RELEASE_PKT(i_pak); 6011 return; 6012 } 6013 m = SCTP_HEADER_TO_CHAIN(i_pak); 6014 #ifdef SCTP_MBUF_LOGGING 6015 /* Log in any input mbufs */ 6016 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6017 struct mbuf *mat; 6018 6019 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6020 if (SCTP_BUF_IS_EXTENDED(mat)) { 6021 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6022 } 6023 } 6024 } 6025 #endif 6026 #ifdef SCTP_PACKET_LOGGING 6027 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6028 sctp_packet_log(m); 6029 } 6030 #endif 6031 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6032 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6033 m->m_pkthdr.len, 6034 if_name(m->m_pkthdr.rcvif), 6035 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6036 if (m->m_flags & M_FLOWID) { 6037 mflowid = m->m_pkthdr.flowid; 6038 use_mflowid = 1; 6039 } else { 6040 mflowid = 0; 6041 use_mflowid = 0; 6042 } 6043 SCTP_STAT_INCR(sctps_recvpackets); 6044 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6045 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6046 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6047 if (SCTP_BUF_LEN(m) < offset) { 6048 if ((m = m_pullup(m, offset)) == NULL) { 6049 SCTP_STAT_INCR(sctps_hdrops); 6050 return; 6051 } 6052 } 6053 ip = mtod(m, struct ip *); 6054 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6055 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6056 offset -= sizeof(struct sctp_chunkhdr); 6057 memset(&src, 0, sizeof(struct sockaddr_in)); 6058 src.sin_family = AF_INET; 6059 src.sin_len = sizeof(struct sockaddr_in); 6060 src.sin_port = sh->src_port; 6061 src.sin_addr = ip->ip_src; 6062 memset(&dst, 0, sizeof(struct sockaddr_in)); 6063 dst.sin_family = AF_INET; 6064 dst.sin_len = sizeof(struct sockaddr_in); 6065 dst.sin_port = sh->dest_port; 6066 dst.sin_addr = ip->ip_dst; 6067 length = ntohs(ip->ip_len); 6068 /* Validate mbuf chain length with IP payload length. */ 6069 if (SCTP_HEADER_LEN(m) != length) { 6070 SCTPDBG(SCTP_DEBUG_INPUT1, 6071 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6072 SCTP_STAT_INCR(sctps_hdrops); 6073 goto out; 6074 } 6075 /* SCTP does not allow broadcasts or multicasts */ 6076 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6077 goto out; 6078 } 6079 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6080 goto out; 6081 } 6082 ecn_bits = ip->ip_tos; 6083 #if defined(SCTP_WITH_NO_CSUM) 6084 SCTP_STAT_INCR(sctps_recvnocrc); 6085 #else 6086 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6087 SCTP_STAT_INCR(sctps_recvhwcrc); 6088 compute_crc = 0; 6089 } else { 6090 SCTP_STAT_INCR(sctps_recvswcrc); 6091 compute_crc = 1; 6092 } 6093 #endif 6094 sctp_common_input_processing(&m, iphlen, offset, length, 6095 (struct sockaddr *)&src, 6096 (struct sockaddr *)&dst, 6097 sh, ch, 6098 #if !defined(SCTP_WITH_NO_CSUM) 6099 compute_crc, 6100 #endif 6101 ecn_bits, 6102 use_mflowid, mflowid, 6103 vrf_id, port); 6104 out: 6105 if (m) { 6106 sctp_m_freem(m); 6107 } 6108 return; 6109 } 6110 6111 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6112 extern int *sctp_cpuarry; 6113 6114 #endif 6115 6116 int 6117 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6118 { 6119 struct mbuf *m; 6120 int off; 6121 6122 m = *mp; 6123 off = *offp; 6124 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6125 if (mp_ncpus > 1) { 6126 struct ip *ip; 6127 struct sctphdr *sh; 6128 int offset; 6129 int cpu_to_use; 6130 uint32_t flowid, tag; 6131 6132 if (m->m_flags & M_FLOWID) { 6133 flowid = m->m_pkthdr.flowid; 6134 } else { 6135 /* 6136 * No flow id built by lower layers fix it so we 6137 * create one. 6138 */ 6139 offset = off + sizeof(struct sctphdr); 6140 if (SCTP_BUF_LEN(m) < offset) { 6141 if ((m = m_pullup(m, offset)) == NULL) { 6142 SCTP_STAT_INCR(sctps_hdrops); 6143 return (IPPROTO_DONE); 6144 } 6145 } 6146 ip = mtod(m, struct ip *); 6147 sh = (struct sctphdr *)((caddr_t)ip + off); 6148 tag = htonl(sh->v_tag); 6149 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6150 m->m_pkthdr.flowid = flowid; 6151 m->m_flags |= M_FLOWID; 6152 } 6153 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6154 sctp_queue_to_mcore(m, off, cpu_to_use); 6155 return (IPPROTO_DONE); 6156 } 6157 #endif 6158 sctp_input_with_port(m, off, 0); 6159 return (IPPROTO_DONE); 6160 } 6161 6162 #endif 6163