1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91 { 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207 outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211 } 212 213 /* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217 int 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221 #endif 222 ) 223 { 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280 } 281 282 static int 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284 { 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322 #ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325 #endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 outs->state = SCTP_STREAM_CLOSED; 361 } 362 } 363 /* cut back the count */ 364 asoc->pre_open_streams = newcnt; 365 } 366 SCTP_TCB_SEND_UNLOCK(stcb); 367 asoc->streamoutcnt = asoc->pre_open_streams; 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 372 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 373 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 374 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 375 } 376 /* This is the next one we expect */ 377 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 378 379 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 380 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 381 382 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 383 /* open the requested streams */ 384 385 if (asoc->strmin != NULL) { 386 /* Free the old ones */ 387 struct sctp_queued_to_read *ctl, *nctl; 388 389 for (i = 0; i < asoc->streamincnt; i++) { 390 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 391 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 392 sctp_free_remote_addr(ctl->whoFrom); 393 ctl->whoFrom = NULL; 394 sctp_m_freem(ctl->data); 395 ctl->data = NULL; 396 sctp_free_a_readq(stcb, ctl); 397 } 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].stream_no = i; 415 asoc->strmin[i].last_sequence_delivered = 0xffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 asoc->strmin[i].delivery_started = 0; 418 } 419 /* 420 * load_address_from_init will put the addresses into the 421 * association when the COOKIE is processed or the INIT-ACK is 422 * processed. Both types of COOKIE's existing and new call this 423 * routine. It will remove addresses that are no longer in the 424 * association (for the restarting case where addresses are 425 * removed). Up front when the INIT arrives we will discard it if it 426 * is a restart and new addresses have been added. 427 */ 428 /* sa_ignore MEMLEAK */ 429 return (0); 430 } 431 432 /* 433 * INIT-ACK message processing/consumption returns value < 0 on error 434 */ 435 static int 436 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 437 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 438 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 439 struct sctp_nets *net, int *abort_no_unlock, 440 uint8_t mflowtype, uint32_t mflowid, 441 uint32_t vrf_id) 442 { 443 struct sctp_association *asoc; 444 struct mbuf *op_err; 445 int retval, abort_flag; 446 uint32_t initack_limit; 447 int nat_friendly = 0; 448 449 /* First verify that we have no illegal param's */ 450 abort_flag = 0; 451 452 op_err = sctp_arethere_unrecognized_parameters(m, 453 (offset + sizeof(struct sctp_init_chunk)), 454 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 455 if (abort_flag) { 456 /* Send an abort and notify peer */ 457 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 458 *abort_no_unlock = 1; 459 return (-1); 460 } 461 asoc = &stcb->asoc; 462 asoc->peer_supports_nat = (uint8_t) nat_friendly; 463 /* process the peer's parameters in the INIT-ACK */ 464 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 465 if (retval < 0) { 466 return (retval); 467 } 468 initack_limit = offset + ntohs(cp->ch.chunk_length); 469 /* load all addresses */ 470 if ((retval = sctp_load_addresses_from_init(stcb, m, 471 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 472 src, dst, NULL))) { 473 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 474 "Problem with address parameters"); 475 SCTPDBG(SCTP_DEBUG_INPUT1, 476 "Load addresses from INIT causes an abort %d\n", 477 retval); 478 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 479 src, dst, sh, op_err, 480 mflowtype, mflowid, 481 vrf_id, net->port); 482 *abort_no_unlock = 1; 483 return (-1); 484 } 485 /* if the peer doesn't support asconf, flush the asconf queue */ 486 if (asoc->asconf_supported == 0) { 487 struct sctp_asconf_addr *param, *nparam; 488 489 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 490 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 491 SCTP_FREE(param, SCTP_M_ASC_ADDR); 492 } 493 } 494 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 495 stcb->asoc.local_hmacs); 496 if (op_err) { 497 sctp_queue_op_err(stcb, op_err); 498 /* queuing will steal away the mbuf chain to the out queue */ 499 op_err = NULL; 500 } 501 /* extract the cookie and queue it to "echo" it back... */ 502 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 503 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 504 stcb->asoc.overall_error_count, 505 0, 506 SCTP_FROM_SCTP_INPUT, 507 __LINE__); 508 } 509 stcb->asoc.overall_error_count = 0; 510 net->error_count = 0; 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assue that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 523 SCTP_RTT_FROM_NON_DATA); 524 525 retval = sctp_send_cookie_echo(m, offset, stcb, net); 526 if (retval < 0) { 527 /* 528 * No cookie, we probably should send a op error. But in any 529 * case if there is no cookie in the INIT-ACK, we can 530 * abandon the peer, its broke. 531 */ 532 if (retval == -3) { 533 /* We abort with an error of missing mandatory param */ 534 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 535 if (op_err) { 536 /* 537 * Expand beyond to include the mandatory 538 * param cookie 539 */ 540 struct sctp_inv_mandatory_param *mp; 541 542 SCTP_BUF_LEN(op_err) = 543 sizeof(struct sctp_inv_mandatory_param); 544 mp = mtod(op_err, 545 struct sctp_inv_mandatory_param *); 546 /* Subtract the reserved param */ 547 mp->length = 548 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 549 mp->num_param = htonl(1); 550 mp->param = htons(SCTP_STATE_COOKIE); 551 mp->resv = 0; 552 } 553 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 554 src, dst, sh, op_err, 555 mflowtype, mflowid, 556 vrf_id, net->port); 557 *abort_no_unlock = 1; 558 } 559 return (retval); 560 } 561 return (0); 562 } 563 564 static void 565 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 566 struct sctp_tcb *stcb, struct sctp_nets *net) 567 { 568 union sctp_sockstore store; 569 struct sctp_nets *r_net, *f_net; 570 struct timeval tv; 571 int req_prim = 0; 572 uint16_t old_error_counter; 573 574 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 575 /* Invalid length */ 576 return; 577 } 578 memset(&store, 0, sizeof(store)); 579 switch (cp->heartbeat.hb_info.addr_family) { 580 #ifdef INET 581 case AF_INET: 582 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 583 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 584 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 585 store.sin.sin_port = stcb->rport; 586 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 587 sizeof(store.sin.sin_addr)); 588 } else { 589 return; 590 } 591 break; 592 #endif 593 #ifdef INET6 594 case AF_INET6: 595 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 596 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 597 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 598 store.sin6.sin6_port = stcb->rport; 599 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 600 } else { 601 return; 602 } 603 break; 604 #endif 605 default: 606 return; 607 } 608 r_net = sctp_findnet(stcb, &store.sa); 609 if (r_net == NULL) { 610 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 611 return; 612 } 613 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 614 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 615 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 616 /* 617 * If the its a HB and it's random value is correct when can 618 * confirm the destination. 619 */ 620 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 621 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 622 stcb->asoc.primary_destination = r_net; 623 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 624 f_net = TAILQ_FIRST(&stcb->asoc.nets); 625 if (f_net != r_net) { 626 /* 627 * first one on the list is NOT the primary 628 * sctp_cmpaddr() is much more efficent if 629 * the primary is the first on the list, 630 * make it so. 631 */ 632 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 633 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 634 } 635 req_prim = 1; 636 } 637 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 638 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 639 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 640 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 642 } 643 old_error_counter = r_net->error_count; 644 r_net->error_count = 0; 645 r_net->hb_responded = 1; 646 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 647 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 648 /* Now lets do a RTO with this */ 649 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 650 SCTP_RTT_FROM_NON_DATA); 651 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 652 r_net->dest_state |= SCTP_ADDR_REACHABLE; 653 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 654 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 655 } 656 if (r_net->dest_state & SCTP_ADDR_PF) { 657 r_net->dest_state &= ~SCTP_ADDR_PF; 658 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 659 } 660 if (old_error_counter > 0) { 661 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 662 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 663 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 664 } 665 if (r_net == stcb->asoc.primary_destination) { 666 if (stcb->asoc.alternate) { 667 /* release the alternate, primary is good */ 668 sctp_free_remote_addr(stcb->asoc.alternate); 669 stcb->asoc.alternate = NULL; 670 } 671 } 672 /* Mobility adaptation */ 673 if (req_prim) { 674 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 675 SCTP_MOBILITY_BASE) || 676 sctp_is_mobility_feature_on(stcb->sctp_ep, 677 SCTP_MOBILITY_FASTHANDOFF)) && 678 sctp_is_mobility_feature_on(stcb->sctp_ep, 679 SCTP_MOBILITY_PRIM_DELETED)) { 680 681 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 682 stcb->sctp_ep, stcb, NULL, 683 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 684 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_FASTHANDOFF)) { 686 sctp_assoc_immediate_retrans(stcb, 687 stcb->asoc.primary_destination); 688 } 689 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 690 SCTP_MOBILITY_BASE)) { 691 sctp_move_chunks_from_net(stcb, 692 stcb->asoc.deleted_primary); 693 } 694 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 695 stcb->asoc.deleted_primary); 696 } 697 } 698 } 699 700 static int 701 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 702 { 703 /* 704 * return 0 means we want you to proceed with the abort non-zero 705 * means no abort processing 706 */ 707 struct sctpasochead *head; 708 709 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 710 /* generate a new vtag and send init */ 711 LIST_REMOVE(stcb, sctp_asocs); 712 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 713 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 714 /* 715 * put it in the bucket in the vtag hash of assoc's for the 716 * system 717 */ 718 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 719 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 720 return (1); 721 } 722 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 723 /* 724 * treat like a case where the cookie expired i.e.: - dump 725 * current cookie. - generate a new vtag. - resend init. 726 */ 727 /* generate a new vtag and send init */ 728 LIST_REMOVE(stcb, sctp_asocs); 729 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 730 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 731 sctp_stop_all_cookie_timers(stcb); 732 sctp_toss_old_cookies(stcb, &stcb->asoc); 733 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 734 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 735 /* 736 * put it in the bucket in the vtag hash of assoc's for the 737 * system 738 */ 739 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 740 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 741 return (1); 742 } 743 return (0); 744 } 745 746 static int 747 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 748 struct sctp_nets *net) 749 { 750 /* 751 * return 0 means we want you to proceed with the abort non-zero 752 * means no abort processing 753 */ 754 if (stcb->asoc.auth_supported == 0) { 755 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 756 return (0); 757 } 758 sctp_asconf_send_nat_state_update(stcb, net); 759 return (1); 760 } 761 762 763 static void 764 sctp_handle_abort(struct sctp_abort_chunk *abort, 765 struct sctp_tcb *stcb, struct sctp_nets *net) 766 { 767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 768 struct socket *so; 769 770 #endif 771 uint16_t len; 772 uint16_t error; 773 774 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 775 if (stcb == NULL) 776 return; 777 778 len = ntohs(abort->ch.chunk_length); 779 if (len > sizeof(struct sctp_chunkhdr)) { 780 /* 781 * Need to check the cause codes for our two magic nat 782 * aborts which don't kill the assoc necessarily. 783 */ 784 struct sctp_missing_nat_state *natc; 785 786 natc = (struct sctp_missing_nat_state *)(abort + 1); 787 error = ntohs(natc->cause); 788 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 789 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 790 abort->ch.chunk_flags); 791 if (sctp_handle_nat_colliding_state(stcb)) { 792 return; 793 } 794 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 795 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 796 abort->ch.chunk_flags); 797 if (sctp_handle_nat_missing_state(stcb, net)) { 798 return; 799 } 800 } 801 } else { 802 error = 0; 803 } 804 /* stop any receive timers */ 805 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 806 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 807 /* notify user of the abort and clean up... */ 808 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 809 /* free the tcb */ 810 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 811 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 812 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 813 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 814 } 815 #ifdef SCTP_ASOCLOG_OF_TSNS 816 sctp_print_out_track_log(stcb); 817 #endif 818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 819 so = SCTP_INP_SO(stcb->sctp_ep); 820 atomic_add_int(&stcb->asoc.refcnt, 1); 821 SCTP_TCB_UNLOCK(stcb); 822 SCTP_SOCKET_LOCK(so, 1); 823 SCTP_TCB_LOCK(stcb); 824 atomic_subtract_int(&stcb->asoc.refcnt, 1); 825 #endif 826 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 827 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 828 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 829 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 830 SCTP_SOCKET_UNLOCK(so, 1); 831 #endif 832 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 833 } 834 835 static void 836 sctp_start_net_timers(struct sctp_tcb *stcb) 837 { 838 uint32_t cnt_hb_sent; 839 struct sctp_nets *net; 840 841 cnt_hb_sent = 0; 842 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 843 /* 844 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 845 * If the dest in unconfirmed send a hb as well if under 846 * max_hb_burst have been sent. 847 */ 848 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 849 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 850 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 851 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 852 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 853 cnt_hb_sent++; 854 } 855 } 856 if (cnt_hb_sent) { 857 sctp_chunk_output(stcb->sctp_ep, stcb, 858 SCTP_OUTPUT_FROM_COOKIE_ACK, 859 SCTP_SO_NOT_LOCKED); 860 } 861 } 862 863 864 static void 865 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 866 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 867 { 868 struct sctp_association *asoc; 869 int some_on_streamwheel; 870 871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 872 struct socket *so; 873 874 #endif 875 876 SCTPDBG(SCTP_DEBUG_INPUT2, 877 "sctp_handle_shutdown: handling SHUTDOWN\n"); 878 if (stcb == NULL) 879 return; 880 asoc = &stcb->asoc; 881 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 882 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 883 return; 884 } 885 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 886 /* Shutdown NOT the expected size */ 887 return; 888 } else { 889 sctp_update_acked(stcb, cp, abort_flag); 890 if (*abort_flag) { 891 return; 892 } 893 } 894 if (asoc->control_pdapi) { 895 /* 896 * With a normal shutdown we assume the end of last record. 897 */ 898 SCTP_INP_READ_LOCK(stcb->sctp_ep); 899 asoc->control_pdapi->end_added = 1; 900 asoc->control_pdapi->pdapi_aborted = 1; 901 asoc->control_pdapi = NULL; 902 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 904 so = SCTP_INP_SO(stcb->sctp_ep); 905 atomic_add_int(&stcb->asoc.refcnt, 1); 906 SCTP_TCB_UNLOCK(stcb); 907 SCTP_SOCKET_LOCK(so, 1); 908 SCTP_TCB_LOCK(stcb); 909 atomic_subtract_int(&stcb->asoc.refcnt, 1); 910 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 911 /* assoc was freed while we were unlocked */ 912 SCTP_SOCKET_UNLOCK(so, 1); 913 return; 914 } 915 #endif 916 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 917 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 918 SCTP_SOCKET_UNLOCK(so, 1); 919 #endif 920 } 921 /* goto SHUTDOWN_RECEIVED state to block new requests */ 922 if (stcb->sctp_socket) { 923 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 924 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 925 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 926 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 927 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 928 /* 929 * notify upper layer that peer has initiated a 930 * shutdown 931 */ 932 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 933 934 /* reset time */ 935 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 936 } 937 } 938 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 939 /* 940 * stop the shutdown timer, since we WILL move to 941 * SHUTDOWN-ACK-SENT. 942 */ 943 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 944 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 945 } 946 /* Now is there unsent data on a stream somewhere? */ 947 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 948 949 if (!TAILQ_EMPTY(&asoc->send_queue) || 950 !TAILQ_EMPTY(&asoc->sent_queue) || 951 some_on_streamwheel) { 952 /* By returning we will push more data out */ 953 return; 954 } else { 955 /* no outstanding data to send, so move on... */ 956 /* send SHUTDOWN-ACK */ 957 /* move to SHUTDOWN-ACK-SENT state */ 958 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 959 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 960 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 961 } 962 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 963 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 964 sctp_stop_timers_for_shutdown(stcb); 965 sctp_send_shutdown_ack(stcb, net); 966 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 967 stcb, net); 968 } 969 } 970 971 static void 972 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 973 struct sctp_tcb *stcb, 974 struct sctp_nets *net) 975 { 976 struct sctp_association *asoc; 977 978 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 979 struct socket *so; 980 981 so = SCTP_INP_SO(stcb->sctp_ep); 982 #endif 983 SCTPDBG(SCTP_DEBUG_INPUT2, 984 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 985 if (stcb == NULL) 986 return; 987 988 asoc = &stcb->asoc; 989 /* process according to association state */ 990 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 991 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 992 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 993 sctp_send_shutdown_complete(stcb, net, 1); 994 SCTP_TCB_UNLOCK(stcb); 995 return; 996 } 997 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 998 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 999 /* unexpected SHUTDOWN-ACK... so ignore... */ 1000 SCTP_TCB_UNLOCK(stcb); 1001 return; 1002 } 1003 if (asoc->control_pdapi) { 1004 /* 1005 * With a normal shutdown we assume the end of last record. 1006 */ 1007 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1008 asoc->control_pdapi->end_added = 1; 1009 asoc->control_pdapi->pdapi_aborted = 1; 1010 asoc->control_pdapi = NULL; 1011 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1012 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1013 atomic_add_int(&stcb->asoc.refcnt, 1); 1014 SCTP_TCB_UNLOCK(stcb); 1015 SCTP_SOCKET_LOCK(so, 1); 1016 SCTP_TCB_LOCK(stcb); 1017 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1018 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1019 /* assoc was freed while we were unlocked */ 1020 SCTP_SOCKET_UNLOCK(so, 1); 1021 return; 1022 } 1023 #endif 1024 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1025 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1026 SCTP_SOCKET_UNLOCK(so, 1); 1027 #endif 1028 } 1029 #ifdef INVARIANTS 1030 if (!TAILQ_EMPTY(&asoc->send_queue) || 1031 !TAILQ_EMPTY(&asoc->sent_queue) || 1032 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1033 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1034 } 1035 #endif 1036 /* stop the timer */ 1037 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1038 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1039 /* send SHUTDOWN-COMPLETE */ 1040 sctp_send_shutdown_complete(stcb, net, 0); 1041 /* notify upper layer protocol */ 1042 if (stcb->sctp_socket) { 1043 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1044 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1045 stcb->sctp_socket->so_snd.sb_cc = 0; 1046 } 1047 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1048 } 1049 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1050 /* free the TCB but first save off the ep */ 1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1052 atomic_add_int(&stcb->asoc.refcnt, 1); 1053 SCTP_TCB_UNLOCK(stcb); 1054 SCTP_SOCKET_LOCK(so, 1); 1055 SCTP_TCB_LOCK(stcb); 1056 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1057 #endif 1058 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1059 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1060 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062 #endif 1063 } 1064 1065 /* 1066 * Skip past the param header and then we will find the chunk that caused the 1067 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1068 * our peer must be broken. 1069 */ 1070 static void 1071 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1072 struct sctp_nets *net) 1073 { 1074 struct sctp_chunkhdr *chk; 1075 1076 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1077 switch (chk->chunk_type) { 1078 case SCTP_ASCONF_ACK: 1079 case SCTP_ASCONF: 1080 sctp_asconf_cleanup(stcb, net); 1081 break; 1082 case SCTP_FORWARD_CUM_TSN: 1083 stcb->asoc.prsctp_supported = 0; 1084 break; 1085 default: 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Peer does not support chunk type %d(%x)??\n", 1088 chk->chunk_type, (uint32_t) chk->chunk_type); 1089 break; 1090 } 1091 } 1092 1093 /* 1094 * Skip past the param header and then we will find the param that caused the 1095 * problem. There are a number of param's in a ASCONF OR the prsctp param 1096 * these will turn of specific features. 1097 * XXX: Is this the right thing to do? 1098 */ 1099 static void 1100 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1101 { 1102 struct sctp_paramhdr *pbad; 1103 1104 pbad = phdr + 1; 1105 switch (ntohs(pbad->param_type)) { 1106 /* pr-sctp draft */ 1107 case SCTP_PRSCTP_SUPPORTED: 1108 stcb->asoc.prsctp_supported = 0; 1109 break; 1110 case SCTP_SUPPORTED_CHUNK_EXT: 1111 break; 1112 /* draft-ietf-tsvwg-addip-sctp */ 1113 case SCTP_HAS_NAT_SUPPORT: 1114 stcb->asoc.peer_supports_nat = 0; 1115 break; 1116 case SCTP_ADD_IP_ADDRESS: 1117 case SCTP_DEL_IP_ADDRESS: 1118 case SCTP_SET_PRIM_ADDR: 1119 stcb->asoc.asconf_supported = 0; 1120 break; 1121 case SCTP_SUCCESS_REPORT: 1122 case SCTP_ERROR_CAUSE_IND: 1123 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1124 SCTPDBG(SCTP_DEBUG_INPUT2, 1125 "Turning off ASCONF to this strange peer\n"); 1126 stcb->asoc.asconf_supported = 0; 1127 break; 1128 default: 1129 SCTPDBG(SCTP_DEBUG_INPUT2, 1130 "Peer does not support param type %d(%x)??\n", 1131 pbad->param_type, (uint32_t) pbad->param_type); 1132 break; 1133 } 1134 } 1135 1136 static int 1137 sctp_handle_error(struct sctp_chunkhdr *ch, 1138 struct sctp_tcb *stcb, struct sctp_nets *net) 1139 { 1140 int chklen; 1141 struct sctp_paramhdr *phdr; 1142 uint16_t error, error_type; 1143 uint16_t error_len; 1144 struct sctp_association *asoc; 1145 int adjust; 1146 1147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1148 struct socket *so; 1149 1150 #endif 1151 1152 /* parse through all of the errors and process */ 1153 asoc = &stcb->asoc; 1154 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1155 sizeof(struct sctp_chunkhdr)); 1156 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1157 error = 0; 1158 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1159 /* Process an Error Cause */ 1160 error_type = ntohs(phdr->param_type); 1161 error_len = ntohs(phdr->param_length); 1162 if ((error_len > chklen) || (error_len == 0)) { 1163 /* invalid param length for this param */ 1164 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1165 chklen, error_len); 1166 return (0); 1167 } 1168 if (error == 0) { 1169 /* report the first error cause */ 1170 error = error_type; 1171 } 1172 switch (error_type) { 1173 case SCTP_CAUSE_INVALID_STREAM: 1174 case SCTP_CAUSE_MISSING_PARAM: 1175 case SCTP_CAUSE_INVALID_PARAM: 1176 case SCTP_CAUSE_NO_USER_DATA: 1177 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1178 error_type); 1179 break; 1180 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1181 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1182 ch->chunk_flags); 1183 if (sctp_handle_nat_colliding_state(stcb)) { 1184 return (0); 1185 } 1186 break; 1187 case SCTP_CAUSE_NAT_MISSING_STATE: 1188 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1189 ch->chunk_flags); 1190 if (sctp_handle_nat_missing_state(stcb, net)) { 1191 return (0); 1192 } 1193 break; 1194 case SCTP_CAUSE_STALE_COOKIE: 1195 /* 1196 * We only act if we have echoed a cookie and are 1197 * waiting. 1198 */ 1199 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1200 int *p; 1201 1202 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1203 /* Save the time doubled */ 1204 asoc->cookie_preserve_req = ntohl(*p) << 1; 1205 asoc->stale_cookie_count++; 1206 if (asoc->stale_cookie_count > 1207 asoc->max_init_times) { 1208 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1209 /* now free the asoc */ 1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 so = SCTP_INP_SO(stcb->sctp_ep); 1212 atomic_add_int(&stcb->asoc.refcnt, 1); 1213 SCTP_TCB_UNLOCK(stcb); 1214 SCTP_SOCKET_LOCK(so, 1); 1215 SCTP_TCB_LOCK(stcb); 1216 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1217 #endif 1218 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1219 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1220 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1221 SCTP_SOCKET_UNLOCK(so, 1); 1222 #endif 1223 return (-1); 1224 } 1225 /* blast back to INIT state */ 1226 sctp_toss_old_cookies(stcb, &stcb->asoc); 1227 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1228 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1229 sctp_stop_all_cookie_timers(stcb); 1230 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1231 } 1232 break; 1233 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1234 /* 1235 * Nothing we can do here, we don't do hostname 1236 * addresses so if the peer does not like my IPv6 1237 * (or IPv4 for that matter) it does not matter. If 1238 * they don't support that type of address, they can 1239 * NOT possibly get that packet type... i.e. with no 1240 * IPv6 you can't recieve a IPv6 packet. so we can 1241 * safely ignore this one. If we ever added support 1242 * for HOSTNAME Addresses, then we would need to do 1243 * something here. 1244 */ 1245 break; 1246 case SCTP_CAUSE_UNRECOG_CHUNK: 1247 sctp_process_unrecog_chunk(stcb, phdr, net); 1248 break; 1249 case SCTP_CAUSE_UNRECOG_PARAM: 1250 sctp_process_unrecog_param(stcb, phdr); 1251 break; 1252 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1253 /* 1254 * We ignore this since the timer will drive out a 1255 * new cookie anyway and there timer will drive us 1256 * to send a SHUTDOWN_COMPLETE. We can't send one 1257 * here since we don't have their tag. 1258 */ 1259 break; 1260 case SCTP_CAUSE_DELETING_LAST_ADDR: 1261 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1262 case SCTP_CAUSE_DELETING_SRC_ADDR: 1263 /* 1264 * We should NOT get these here, but in a 1265 * ASCONF-ACK. 1266 */ 1267 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1268 error_type); 1269 break; 1270 case SCTP_CAUSE_OUT_OF_RESC: 1271 /* 1272 * And what, pray tell do we do with the fact that 1273 * the peer is out of resources? Not really sure we 1274 * could do anything but abort. I suspect this 1275 * should have came WITH an abort instead of in a 1276 * OP-ERROR. 1277 */ 1278 break; 1279 default: 1280 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1281 error_type); 1282 break; 1283 } 1284 adjust = SCTP_SIZE32(error_len); 1285 chklen -= adjust; 1286 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1287 } 1288 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1289 return (0); 1290 } 1291 1292 static int 1293 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1294 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1295 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1296 struct sctp_nets *net, int *abort_no_unlock, 1297 uint8_t mflowtype, uint32_t mflowid, 1298 uint32_t vrf_id) 1299 { 1300 struct sctp_init_ack *init_ack; 1301 struct mbuf *op_err; 1302 1303 SCTPDBG(SCTP_DEBUG_INPUT2, 1304 "sctp_handle_init_ack: handling INIT-ACK\n"); 1305 1306 if (stcb == NULL) { 1307 SCTPDBG(SCTP_DEBUG_INPUT2, 1308 "sctp_handle_init_ack: TCB is null\n"); 1309 return (-1); 1310 } 1311 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1312 /* Invalid length */ 1313 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1314 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1315 src, dst, sh, op_err, 1316 mflowtype, mflowid, 1317 vrf_id, net->port); 1318 *abort_no_unlock = 1; 1319 return (-1); 1320 } 1321 init_ack = &cp->init; 1322 /* validate parameters */ 1323 if (init_ack->initiate_tag == 0) { 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 mflowtype, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 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 mflowtype, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_inbound_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 mflowtype, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 if (init_ack->num_outbound_streams == 0) { 1354 /* protocol error... send an abort */ 1355 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1356 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1357 src, dst, sh, op_err, 1358 mflowtype, mflowid, 1359 vrf_id, net->port); 1360 *abort_no_unlock = 1; 1361 return (-1); 1362 } 1363 /* process according to association state... */ 1364 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1365 case SCTP_STATE_COOKIE_WAIT: 1366 /* this is the expected state for this chunk */ 1367 /* process the INIT-ACK parameters */ 1368 if (stcb->asoc.primary_destination->dest_state & 1369 SCTP_ADDR_UNCONFIRMED) { 1370 /* 1371 * The primary is where we sent the INIT, we can 1372 * always consider it confirmed when the INIT-ACK is 1373 * returned. Do this before we load addresses 1374 * though. 1375 */ 1376 stcb->asoc.primary_destination->dest_state &= 1377 ~SCTP_ADDR_UNCONFIRMED; 1378 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1379 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1380 } 1381 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1382 net, abort_no_unlock, 1383 mflowtype, mflowid, 1384 vrf_id) < 0) { 1385 /* error in parsing parameters */ 1386 return (-1); 1387 } 1388 /* update our state */ 1389 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1390 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1391 1392 /* reset the RTO calc */ 1393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1394 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1395 stcb->asoc.overall_error_count, 1396 0, 1397 SCTP_FROM_SCTP_INPUT, 1398 __LINE__); 1399 } 1400 stcb->asoc.overall_error_count = 0; 1401 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1402 /* 1403 * collapse the init timer back in case of a exponential 1404 * backoff 1405 */ 1406 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1407 stcb, net); 1408 /* 1409 * the send at the end of the inbound data processing will 1410 * cause the cookie to be sent 1411 */ 1412 break; 1413 case SCTP_STATE_SHUTDOWN_SENT: 1414 /* incorrect state... discard */ 1415 break; 1416 case SCTP_STATE_COOKIE_ECHOED: 1417 /* incorrect state... discard */ 1418 break; 1419 case SCTP_STATE_OPEN: 1420 /* incorrect state... discard */ 1421 break; 1422 case SCTP_STATE_EMPTY: 1423 case SCTP_STATE_INUSE: 1424 default: 1425 /* incorrect state... discard */ 1426 return (-1); 1427 break; 1428 } 1429 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1430 return (0); 1431 } 1432 1433 static struct sctp_tcb * 1434 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1435 struct sockaddr *src, struct sockaddr *dst, 1436 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1437 struct sctp_inpcb *inp, struct sctp_nets **netp, 1438 struct sockaddr *init_src, int *notification, 1439 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1440 uint8_t mflowtype, uint32_t mflowid, 1441 uint32_t vrf_id, uint16_t port); 1442 1443 1444 /* 1445 * handle a state cookie for an existing association m: input packet mbuf 1446 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1447 * "split" mbuf and the cookie signature does not exist offset: offset into 1448 * mbuf to the cookie-echo chunk 1449 */ 1450 static struct sctp_tcb * 1451 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1452 struct sockaddr *src, struct sockaddr *dst, 1453 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1454 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1455 struct sockaddr *init_src, int *notification, 1456 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1457 uint8_t mflowtype, uint32_t mflowid, 1458 uint32_t vrf_id, uint16_t port) 1459 { 1460 struct sctp_association *asoc; 1461 struct sctp_init_chunk *init_cp, init_buf; 1462 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1463 struct sctp_nets *net; 1464 struct mbuf *op_err; 1465 int init_offset, initack_offset, i; 1466 int retval; 1467 int spec_flag = 0; 1468 uint32_t how_indx; 1469 1470 #if defined(SCTP_DETAILED_STR_STATS) 1471 int j; 1472 1473 #endif 1474 1475 net = *netp; 1476 /* I know that the TCB is non-NULL from the caller */ 1477 asoc = &stcb->asoc; 1478 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1479 if (asoc->cookie_how[how_indx] == 0) 1480 break; 1481 } 1482 if (how_indx < sizeof(asoc->cookie_how)) { 1483 asoc->cookie_how[how_indx] = 1; 1484 } 1485 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1486 /* SHUTDOWN came in after sending INIT-ACK */ 1487 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1488 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1489 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1490 mflowtype, mflowid, inp->fibnum, 1491 vrf_id, net->port); 1492 if (how_indx < sizeof(asoc->cookie_how)) 1493 asoc->cookie_how[how_indx] = 2; 1494 return (NULL); 1495 } 1496 /* 1497 * find and validate the INIT chunk in the cookie (peer's info) the 1498 * INIT should start after the cookie-echo header struct (chunk 1499 * header, state cookie header struct) 1500 */ 1501 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1502 1503 init_cp = (struct sctp_init_chunk *) 1504 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1505 (uint8_t *) & init_buf); 1506 if (init_cp == NULL) { 1507 /* could not pull a INIT chunk in cookie */ 1508 return (NULL); 1509 } 1510 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1511 return (NULL); 1512 } 1513 /* 1514 * find and validate the INIT-ACK chunk in the cookie (my info) the 1515 * INIT-ACK follows the INIT chunk 1516 */ 1517 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1518 initack_cp = (struct sctp_init_ack_chunk *) 1519 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1520 (uint8_t *) & initack_buf); 1521 if (initack_cp == NULL) { 1522 /* could not pull INIT-ACK chunk in cookie */ 1523 return (NULL); 1524 } 1525 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1526 return (NULL); 1527 } 1528 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1529 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1530 /* 1531 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1532 * to get into the OPEN state 1533 */ 1534 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1535 /*- 1536 * Opps, this means that we somehow generated two vtag's 1537 * the same. I.e. we did: 1538 * Us Peer 1539 * <---INIT(tag=a)------ 1540 * ----INIT-ACK(tag=t)--> 1541 * ----INIT(tag=t)------> *1 1542 * <---INIT-ACK(tag=a)--- 1543 * <----CE(tag=t)------------- *2 1544 * 1545 * At point *1 we should be generating a different 1546 * tag t'. Which means we would throw away the CE and send 1547 * ours instead. Basically this is case C (throw away side). 1548 */ 1549 if (how_indx < sizeof(asoc->cookie_how)) 1550 asoc->cookie_how[how_indx] = 17; 1551 return (NULL); 1552 1553 } 1554 switch (SCTP_GET_STATE(asoc)) { 1555 case SCTP_STATE_COOKIE_WAIT: 1556 case SCTP_STATE_COOKIE_ECHOED: 1557 /* 1558 * INIT was sent but got a COOKIE_ECHO with the 1559 * correct tags... just accept it...but we must 1560 * process the init so that we can make sure we have 1561 * the right seq no's. 1562 */ 1563 /* First we must process the INIT !! */ 1564 retval = sctp_process_init(init_cp, stcb); 1565 if (retval < 0) { 1566 if (how_indx < sizeof(asoc->cookie_how)) 1567 asoc->cookie_how[how_indx] = 3; 1568 return (NULL); 1569 } 1570 /* we have already processed the INIT so no problem */ 1571 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1572 stcb, net, 1573 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1574 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1575 stcb, net, 1576 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1577 /* update current state */ 1578 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1579 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1580 else 1581 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1582 1583 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1584 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1585 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1586 stcb->sctp_ep, stcb, asoc->primary_destination); 1587 } 1588 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1589 sctp_stop_all_cookie_timers(stcb); 1590 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1591 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1592 (inp->sctp_socket->so_qlimit == 0) 1593 ) { 1594 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1595 struct socket *so; 1596 1597 #endif 1598 /* 1599 * Here is where collision would go if we 1600 * did a connect() and instead got a 1601 * init/init-ack/cookie done before the 1602 * init-ack came back.. 1603 */ 1604 stcb->sctp_ep->sctp_flags |= 1605 SCTP_PCB_FLAGS_CONNECTED; 1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 so = SCTP_INP_SO(stcb->sctp_ep); 1608 atomic_add_int(&stcb->asoc.refcnt, 1); 1609 SCTP_TCB_UNLOCK(stcb); 1610 SCTP_SOCKET_LOCK(so, 1); 1611 SCTP_TCB_LOCK(stcb); 1612 atomic_add_int(&stcb->asoc.refcnt, -1); 1613 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1614 SCTP_SOCKET_UNLOCK(so, 1); 1615 return (NULL); 1616 } 1617 #endif 1618 soisconnected(stcb->sctp_socket); 1619 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1620 SCTP_SOCKET_UNLOCK(so, 1); 1621 #endif 1622 } 1623 /* notify upper layer */ 1624 *notification = SCTP_NOTIFY_ASSOC_UP; 1625 /* 1626 * since we did not send a HB make sure we don't 1627 * double things 1628 */ 1629 net->hb_responded = 1; 1630 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1631 &cookie->time_entered, 1632 sctp_align_unsafe_makecopy, 1633 SCTP_RTT_FROM_NON_DATA); 1634 1635 if (stcb->asoc.sctp_autoclose_ticks && 1636 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1637 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1638 inp, stcb, NULL); 1639 } 1640 break; 1641 default: 1642 /* 1643 * we're in the OPEN state (or beyond), so peer must 1644 * have simply lost the COOKIE-ACK 1645 */ 1646 break; 1647 } /* end switch */ 1648 sctp_stop_all_cookie_timers(stcb); 1649 /* 1650 * We ignore the return code here.. not sure if we should 1651 * somehow abort.. but we do have an existing asoc. This 1652 * really should not fail. 1653 */ 1654 if (sctp_load_addresses_from_init(stcb, m, 1655 init_offset + sizeof(struct sctp_init_chunk), 1656 initack_offset, src, dst, init_src)) { 1657 if (how_indx < sizeof(asoc->cookie_how)) 1658 asoc->cookie_how[how_indx] = 4; 1659 return (NULL); 1660 } 1661 /* respond with a COOKIE-ACK */ 1662 sctp_toss_old_cookies(stcb, asoc); 1663 sctp_send_cookie_ack(stcb); 1664 if (how_indx < sizeof(asoc->cookie_how)) 1665 asoc->cookie_how[how_indx] = 5; 1666 return (stcb); 1667 } 1668 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1669 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1670 cookie->tie_tag_my_vtag == 0 && 1671 cookie->tie_tag_peer_vtag == 0) { 1672 /* 1673 * case C in Section 5.2.4 Table 2: XMOO silently discard 1674 */ 1675 if (how_indx < sizeof(asoc->cookie_how)) 1676 asoc->cookie_how[how_indx] = 6; 1677 return (NULL); 1678 } 1679 /* 1680 * If nat support, and the below and stcb is established, send back 1681 * a ABORT(colliding state) if we are established. 1682 */ 1683 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1684 (asoc->peer_supports_nat) && 1685 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1686 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1687 (asoc->peer_vtag == 0)))) { 1688 /* 1689 * Special case - Peer's support nat. We may have two init's 1690 * that we gave out the same tag on since one was not 1691 * established.. i.e. we get INIT from host-1 behind the nat 1692 * and we respond tag-a, we get a INIT from host-2 behind 1693 * the nat and we get tag-a again. Then we bring up host-1 1694 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1695 * Now we have colliding state. We must send an abort here 1696 * with colliding state indication. 1697 */ 1698 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1699 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1700 mflowtype, mflowid, inp->fibnum, 1701 vrf_id, port); 1702 return (NULL); 1703 } 1704 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1705 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1706 (asoc->peer_vtag == 0))) { 1707 /* 1708 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1709 * should be ok, re-accept peer info 1710 */ 1711 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1712 /* 1713 * Extension of case C. If we hit this, then the 1714 * random number generator returned the same vtag 1715 * when we first sent our INIT-ACK and when we later 1716 * sent our INIT. The side with the seq numbers that 1717 * are different will be the one that normnally 1718 * would have hit case C. This in effect "extends" 1719 * our vtags in this collision case to be 64 bits. 1720 * The same collision could occur aka you get both 1721 * vtag and seq number the same twice in a row.. but 1722 * is much less likely. If it did happen then we 1723 * would proceed through and bring up the assoc.. we 1724 * may end up with the wrong stream setup however.. 1725 * which would be bad.. but there is no way to 1726 * tell.. until we send on a stream that does not 1727 * exist :-) 1728 */ 1729 if (how_indx < sizeof(asoc->cookie_how)) 1730 asoc->cookie_how[how_indx] = 7; 1731 1732 return (NULL); 1733 } 1734 if (how_indx < sizeof(asoc->cookie_how)) 1735 asoc->cookie_how[how_indx] = 8; 1736 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1737 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1738 sctp_stop_all_cookie_timers(stcb); 1739 /* 1740 * since we did not send a HB make sure we don't double 1741 * things 1742 */ 1743 net->hb_responded = 1; 1744 if (stcb->asoc.sctp_autoclose_ticks && 1745 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1746 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1747 NULL); 1748 } 1749 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1750 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1751 1752 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1753 /* 1754 * Ok the peer probably discarded our data (if we 1755 * echoed a cookie+data). So anything on the 1756 * sent_queue should be marked for retransmit, we 1757 * may not get something to kick us so it COULD 1758 * still take a timeout to move these.. but it can't 1759 * hurt to mark them. 1760 */ 1761 struct sctp_tmit_chunk *chk; 1762 1763 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1764 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1765 chk->sent = SCTP_DATAGRAM_RESEND; 1766 sctp_flight_size_decrease(chk); 1767 sctp_total_flight_decrease(stcb, chk); 1768 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1769 spec_flag++; 1770 } 1771 } 1772 1773 } 1774 /* process the INIT info (peer's info) */ 1775 retval = sctp_process_init(init_cp, stcb); 1776 if (retval < 0) { 1777 if (how_indx < sizeof(asoc->cookie_how)) 1778 asoc->cookie_how[how_indx] = 9; 1779 return (NULL); 1780 } 1781 if (sctp_load_addresses_from_init(stcb, m, 1782 init_offset + sizeof(struct sctp_init_chunk), 1783 initack_offset, src, dst, init_src)) { 1784 if (how_indx < sizeof(asoc->cookie_how)) 1785 asoc->cookie_how[how_indx] = 10; 1786 return (NULL); 1787 } 1788 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1789 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1790 *notification = SCTP_NOTIFY_ASSOC_UP; 1791 1792 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1793 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1794 (inp->sctp_socket->so_qlimit == 0)) { 1795 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1796 struct socket *so; 1797 1798 #endif 1799 stcb->sctp_ep->sctp_flags |= 1800 SCTP_PCB_FLAGS_CONNECTED; 1801 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1802 so = SCTP_INP_SO(stcb->sctp_ep); 1803 atomic_add_int(&stcb->asoc.refcnt, 1); 1804 SCTP_TCB_UNLOCK(stcb); 1805 SCTP_SOCKET_LOCK(so, 1); 1806 SCTP_TCB_LOCK(stcb); 1807 atomic_add_int(&stcb->asoc.refcnt, -1); 1808 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1809 SCTP_SOCKET_UNLOCK(so, 1); 1810 return (NULL); 1811 } 1812 #endif 1813 soisconnected(stcb->sctp_socket); 1814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 SCTP_SOCKET_UNLOCK(so, 1); 1816 #endif 1817 } 1818 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1819 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1820 else 1821 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1822 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1823 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1824 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1825 } else { 1826 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1827 } 1828 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1829 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1830 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1831 stcb->sctp_ep, stcb, asoc->primary_destination); 1832 } 1833 sctp_stop_all_cookie_timers(stcb); 1834 sctp_toss_old_cookies(stcb, asoc); 1835 sctp_send_cookie_ack(stcb); 1836 if (spec_flag) { 1837 /* 1838 * only if we have retrans set do we do this. What 1839 * this call does is get only the COOKIE-ACK out and 1840 * then when we return the normal call to 1841 * sctp_chunk_output will get the retrans out behind 1842 * this. 1843 */ 1844 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1845 } 1846 if (how_indx < sizeof(asoc->cookie_how)) 1847 asoc->cookie_how[how_indx] = 11; 1848 1849 return (stcb); 1850 } 1851 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1852 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1853 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1854 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1855 cookie->tie_tag_peer_vtag != 0) { 1856 struct sctpasochead *head; 1857 1858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1859 struct socket *so; 1860 1861 #endif 1862 1863 if (asoc->peer_supports_nat) { 1864 /* 1865 * This is a gross gross hack. Just call the 1866 * cookie_new code since we are allowing a duplicate 1867 * association. I hope this works... 1868 */ 1869 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1870 sh, cookie, cookie_len, 1871 inp, netp, init_src, notification, 1872 auth_skipped, auth_offset, auth_len, 1873 mflowtype, mflowid, 1874 vrf_id, port)); 1875 } 1876 /* 1877 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1878 */ 1879 /* temp code */ 1880 if (how_indx < sizeof(asoc->cookie_how)) 1881 asoc->cookie_how[how_indx] = 12; 1882 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1883 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1884 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1885 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1886 1887 /* notify upper layer */ 1888 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1889 atomic_add_int(&stcb->asoc.refcnt, 1); 1890 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1891 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1892 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1893 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1894 } 1895 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1896 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1897 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1898 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1899 } 1900 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1901 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1902 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1903 stcb->sctp_ep, stcb, asoc->primary_destination); 1904 1905 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1906 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1907 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1908 } 1909 asoc->pre_open_streams = 1910 ntohs(initack_cp->init.num_outbound_streams); 1911 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1912 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1913 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1914 1915 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1916 1917 asoc->str_reset_seq_in = asoc->init_seq_number; 1918 1919 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1920 if (asoc->mapping_array) { 1921 memset(asoc->mapping_array, 0, 1922 asoc->mapping_array_size); 1923 } 1924 if (asoc->nr_mapping_array) { 1925 memset(asoc->nr_mapping_array, 0, 1926 asoc->mapping_array_size); 1927 } 1928 SCTP_TCB_UNLOCK(stcb); 1929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1930 so = SCTP_INP_SO(stcb->sctp_ep); 1931 SCTP_SOCKET_LOCK(so, 1); 1932 #endif 1933 SCTP_INP_INFO_WLOCK(); 1934 SCTP_INP_WLOCK(stcb->sctp_ep); 1935 SCTP_TCB_LOCK(stcb); 1936 atomic_add_int(&stcb->asoc.refcnt, -1); 1937 /* send up all the data */ 1938 SCTP_TCB_SEND_LOCK(stcb); 1939 1940 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1941 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1942 stcb->asoc.strmout[i].chunks_on_queues = 0; 1943 #if defined(SCTP_DETAILED_STR_STATS) 1944 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1945 asoc->strmout[i].abandoned_sent[j] = 0; 1946 asoc->strmout[i].abandoned_unsent[j] = 0; 1947 } 1948 #else 1949 asoc->strmout[i].abandoned_sent[0] = 0; 1950 asoc->strmout[i].abandoned_unsent[0] = 0; 1951 #endif 1952 stcb->asoc.strmout[i].stream_no = i; 1953 stcb->asoc.strmout[i].next_sequence_send = 0; 1954 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1955 } 1956 /* process the INIT-ACK info (my info) */ 1957 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1958 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1959 1960 /* pull from vtag hash */ 1961 LIST_REMOVE(stcb, sctp_asocs); 1962 /* re-insert to new vtag position */ 1963 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1964 SCTP_BASE_INFO(hashasocmark))]; 1965 /* 1966 * put it in the bucket in the vtag hash of assoc's for the 1967 * system 1968 */ 1969 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1970 1971 SCTP_TCB_SEND_UNLOCK(stcb); 1972 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1973 SCTP_INP_INFO_WUNLOCK(); 1974 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1975 SCTP_SOCKET_UNLOCK(so, 1); 1976 #endif 1977 asoc->total_flight = 0; 1978 asoc->total_flight_count = 0; 1979 /* process the INIT info (peer's info) */ 1980 retval = sctp_process_init(init_cp, stcb); 1981 if (retval < 0) { 1982 if (how_indx < sizeof(asoc->cookie_how)) 1983 asoc->cookie_how[how_indx] = 13; 1984 1985 return (NULL); 1986 } 1987 /* 1988 * since we did not send a HB make sure we don't double 1989 * things 1990 */ 1991 net->hb_responded = 1; 1992 1993 if (sctp_load_addresses_from_init(stcb, m, 1994 init_offset + sizeof(struct sctp_init_chunk), 1995 initack_offset, src, dst, init_src)) { 1996 if (how_indx < sizeof(asoc->cookie_how)) 1997 asoc->cookie_how[how_indx] = 14; 1998 1999 return (NULL); 2000 } 2001 /* respond with a COOKIE-ACK */ 2002 sctp_stop_all_cookie_timers(stcb); 2003 sctp_toss_old_cookies(stcb, asoc); 2004 sctp_send_cookie_ack(stcb); 2005 if (how_indx < sizeof(asoc->cookie_how)) 2006 asoc->cookie_how[how_indx] = 15; 2007 2008 return (stcb); 2009 } 2010 if (how_indx < sizeof(asoc->cookie_how)) 2011 asoc->cookie_how[how_indx] = 16; 2012 /* all other cases... */ 2013 return (NULL); 2014 } 2015 2016 2017 /* 2018 * handle a state cookie for a new association m: input packet mbuf chain-- 2019 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2020 * and the cookie signature does not exist offset: offset into mbuf to the 2021 * cookie-echo chunk length: length of the cookie chunk to: where the init 2022 * was from returns a new TCB 2023 */ 2024 static struct sctp_tcb * 2025 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2026 struct sockaddr *src, struct sockaddr *dst, 2027 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2028 struct sctp_inpcb *inp, struct sctp_nets **netp, 2029 struct sockaddr *init_src, int *notification, 2030 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2031 uint8_t mflowtype, uint32_t mflowid, 2032 uint32_t vrf_id, uint16_t port) 2033 { 2034 struct sctp_tcb *stcb; 2035 struct sctp_init_chunk *init_cp, init_buf; 2036 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2037 union sctp_sockstore store; 2038 struct sctp_association *asoc; 2039 int init_offset, initack_offset, initack_limit; 2040 int retval; 2041 int error = 0; 2042 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2043 2044 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2045 struct socket *so; 2046 2047 so = SCTP_INP_SO(inp); 2048 #endif 2049 2050 /* 2051 * find and validate the INIT chunk in the cookie (peer's info) the 2052 * INIT should start after the cookie-echo header struct (chunk 2053 * header, state cookie header struct) 2054 */ 2055 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2056 init_cp = (struct sctp_init_chunk *) 2057 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2058 (uint8_t *) & init_buf); 2059 if (init_cp == NULL) { 2060 /* could not pull a INIT chunk in cookie */ 2061 SCTPDBG(SCTP_DEBUG_INPUT1, 2062 "process_cookie_new: could not pull INIT chunk hdr\n"); 2063 return (NULL); 2064 } 2065 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2066 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2067 return (NULL); 2068 } 2069 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2070 /* 2071 * find and validate the INIT-ACK chunk in the cookie (my info) the 2072 * INIT-ACK follows the INIT chunk 2073 */ 2074 initack_cp = (struct sctp_init_ack_chunk *) 2075 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2076 (uint8_t *) & initack_buf); 2077 if (initack_cp == NULL) { 2078 /* could not pull INIT-ACK chunk in cookie */ 2079 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2080 return (NULL); 2081 } 2082 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2083 return (NULL); 2084 } 2085 /* 2086 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2087 * "initack_limit" value. This is because the chk_length field 2088 * includes the length of the cookie, but the cookie is omitted when 2089 * the INIT and INIT_ACK are tacked onto the cookie... 2090 */ 2091 initack_limit = offset + cookie_len; 2092 2093 /* 2094 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2095 * and popluate 2096 */ 2097 2098 /* 2099 * Here we do a trick, we set in NULL for the proc/thread argument. 2100 * We do this since in effect we only use the p argument when the 2101 * socket is unbound and we must do an implicit bind. Since we are 2102 * getting a cookie, we cannot be unbound. 2103 */ 2104 stcb = sctp_aloc_assoc(inp, init_src, &error, 2105 ntohl(initack_cp->init.initiate_tag), vrf_id, 2106 (struct thread *)NULL 2107 ); 2108 if (stcb == NULL) { 2109 struct mbuf *op_err; 2110 2111 /* memory problem? */ 2112 SCTPDBG(SCTP_DEBUG_INPUT1, 2113 "process_cookie_new: no room for another TCB!\n"); 2114 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2115 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2116 src, dst, sh, op_err, 2117 mflowtype, mflowid, 2118 vrf_id, port); 2119 return (NULL); 2120 } 2121 /* get the correct sctp_nets */ 2122 if (netp) 2123 *netp = sctp_findnet(stcb, init_src); 2124 2125 asoc = &stcb->asoc; 2126 /* get scope variables out of cookie */ 2127 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2128 asoc->scope.site_scope = cookie->site_scope; 2129 asoc->scope.local_scope = cookie->local_scope; 2130 asoc->scope.loopback_scope = cookie->loopback_scope; 2131 2132 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2133 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2134 struct mbuf *op_err; 2135 2136 /* 2137 * Houston we have a problem. The EP changed while the 2138 * cookie was in flight. Only recourse is to abort the 2139 * association. 2140 */ 2141 atomic_add_int(&stcb->asoc.refcnt, 1); 2142 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2143 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2144 src, dst, sh, op_err, 2145 mflowtype, mflowid, 2146 vrf_id, port); 2147 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2148 SCTP_TCB_UNLOCK(stcb); 2149 SCTP_SOCKET_LOCK(so, 1); 2150 SCTP_TCB_LOCK(stcb); 2151 #endif 2152 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2153 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2154 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2155 SCTP_SOCKET_UNLOCK(so, 1); 2156 #endif 2157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2158 return (NULL); 2159 } 2160 /* process the INIT-ACK info (my info) */ 2161 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2162 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2163 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2164 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2165 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2166 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2167 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2168 asoc->str_reset_seq_in = asoc->init_seq_number; 2169 2170 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2171 2172 /* process the INIT info (peer's info) */ 2173 if (netp) 2174 retval = sctp_process_init(init_cp, stcb); 2175 else 2176 retval = 0; 2177 if (retval < 0) { 2178 atomic_add_int(&stcb->asoc.refcnt, 1); 2179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2180 SCTP_TCB_UNLOCK(stcb); 2181 SCTP_SOCKET_LOCK(so, 1); 2182 SCTP_TCB_LOCK(stcb); 2183 #endif 2184 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2185 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 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 /* load all addresses */ 2193 if (sctp_load_addresses_from_init(stcb, m, 2194 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2195 src, dst, init_src)) { 2196 atomic_add_int(&stcb->asoc.refcnt, 1); 2197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2198 SCTP_TCB_UNLOCK(stcb); 2199 SCTP_SOCKET_LOCK(so, 1); 2200 SCTP_TCB_LOCK(stcb); 2201 #endif 2202 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2203 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2204 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2205 SCTP_SOCKET_UNLOCK(so, 1); 2206 #endif 2207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2208 return (NULL); 2209 } 2210 /* 2211 * verify any preceding AUTH chunk that was skipped 2212 */ 2213 /* pull the local authentication parameters from the cookie/init-ack */ 2214 sctp_auth_get_cookie_params(stcb, m, 2215 initack_offset + sizeof(struct sctp_init_ack_chunk), 2216 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2217 if (auth_skipped) { 2218 struct sctp_auth_chunk *auth; 2219 2220 auth = (struct sctp_auth_chunk *) 2221 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2222 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2223 /* auth HMAC failed, dump the assoc and packet */ 2224 SCTPDBG(SCTP_DEBUG_AUTH1, 2225 "COOKIE-ECHO: AUTH failed\n"); 2226 atomic_add_int(&stcb->asoc.refcnt, 1); 2227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2228 SCTP_TCB_UNLOCK(stcb); 2229 SCTP_SOCKET_LOCK(so, 1); 2230 SCTP_TCB_LOCK(stcb); 2231 #endif 2232 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2233 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2235 SCTP_SOCKET_UNLOCK(so, 1); 2236 #endif 2237 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2238 return (NULL); 2239 } else { 2240 /* remaining chunks checked... good to go */ 2241 stcb->asoc.authenticated = 1; 2242 } 2243 } 2244 /* update current state */ 2245 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2246 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2247 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2248 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2249 stcb->sctp_ep, stcb, asoc->primary_destination); 2250 } 2251 sctp_stop_all_cookie_timers(stcb); 2252 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2253 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2254 2255 /* 2256 * if we're doing ASCONFs, check to see if we have any new local 2257 * addresses that need to get added to the peer (eg. addresses 2258 * changed while cookie echo in flight). This needs to be done 2259 * after we go to the OPEN state to do the correct asconf 2260 * processing. else, make sure we have the correct addresses in our 2261 * lists 2262 */ 2263 2264 /* warning, we re-use sin, sin6, sa_store here! */ 2265 /* pull in local_address (our "from" address) */ 2266 switch (cookie->laddr_type) { 2267 #ifdef INET 2268 case SCTP_IPV4_ADDRESS: 2269 /* source addr is IPv4 */ 2270 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2271 store.sin.sin_family = AF_INET; 2272 store.sin.sin_len = sizeof(struct sockaddr_in); 2273 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2274 break; 2275 #endif 2276 #ifdef INET6 2277 case SCTP_IPV6_ADDRESS: 2278 /* source addr is IPv6 */ 2279 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2280 store.sin6.sin6_family = AF_INET6; 2281 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2282 store.sin6.sin6_scope_id = cookie->scope_id; 2283 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2284 break; 2285 #endif 2286 default: 2287 atomic_add_int(&stcb->asoc.refcnt, 1); 2288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2289 SCTP_TCB_UNLOCK(stcb); 2290 SCTP_SOCKET_LOCK(so, 1); 2291 SCTP_TCB_LOCK(stcb); 2292 #endif 2293 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2294 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2295 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2296 SCTP_SOCKET_UNLOCK(so, 1); 2297 #endif 2298 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2299 return (NULL); 2300 } 2301 2302 /* set up to notify upper layer */ 2303 *notification = SCTP_NOTIFY_ASSOC_UP; 2304 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2305 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2306 (inp->sctp_socket->so_qlimit == 0)) { 2307 /* 2308 * This is an endpoint that called connect() how it got a 2309 * cookie that is NEW is a bit of a mystery. It must be that 2310 * the INIT was sent, but before it got there.. a complete 2311 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2312 * should have went to the other code.. not here.. oh well.. 2313 * a bit of protection is worth having.. 2314 */ 2315 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2317 atomic_add_int(&stcb->asoc.refcnt, 1); 2318 SCTP_TCB_UNLOCK(stcb); 2319 SCTP_SOCKET_LOCK(so, 1); 2320 SCTP_TCB_LOCK(stcb); 2321 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2322 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2323 SCTP_SOCKET_UNLOCK(so, 1); 2324 return (NULL); 2325 } 2326 #endif 2327 soisconnected(stcb->sctp_socket); 2328 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2329 SCTP_SOCKET_UNLOCK(so, 1); 2330 #endif 2331 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2332 (inp->sctp_socket->so_qlimit)) { 2333 /* 2334 * We don't want to do anything with this one. Since it is 2335 * the listening guy. The timer will get started for 2336 * accepted connections in the caller. 2337 */ 2338 ; 2339 } 2340 /* since we did not send a HB make sure we don't double things */ 2341 if ((netp) && (*netp)) 2342 (*netp)->hb_responded = 1; 2343 2344 if (stcb->asoc.sctp_autoclose_ticks && 2345 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2346 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2347 } 2348 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2349 if ((netp) && (*netp)) { 2350 /* calculate the RTT and set the encaps port */ 2351 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2352 &cookie->time_entered, sctp_align_unsafe_makecopy, 2353 SCTP_RTT_FROM_NON_DATA); 2354 (*netp)->port = port; 2355 } 2356 /* respond with a COOKIE-ACK */ 2357 sctp_send_cookie_ack(stcb); 2358 2359 /* 2360 * check the address lists for any ASCONFs that need to be sent 2361 * AFTER the cookie-ack is sent 2362 */ 2363 sctp_check_address_list(stcb, m, 2364 initack_offset + sizeof(struct sctp_init_ack_chunk), 2365 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2366 &store.sa, cookie->local_scope, cookie->site_scope, 2367 cookie->ipv4_scope, cookie->loopback_scope); 2368 2369 2370 return (stcb); 2371 } 2372 2373 /* 2374 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2375 * we NEED to make sure we are not already using the vtag. If so we 2376 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2377 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2378 SCTP_BASE_INFO(hashasocmark))]; 2379 LIST_FOREACH(stcb, head, sctp_asocs) { 2380 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2381 -- SEND ABORT - TRY AGAIN -- 2382 } 2383 } 2384 */ 2385 2386 /* 2387 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2388 * existing (non-NULL) TCB 2389 */ 2390 static struct mbuf * 2391 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2392 struct sockaddr *src, struct sockaddr *dst, 2393 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2394 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2395 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2396 struct sctp_tcb **locked_tcb, 2397 uint8_t mflowtype, uint32_t mflowid, 2398 uint32_t vrf_id, uint16_t port) 2399 { 2400 struct sctp_state_cookie *cookie; 2401 struct sctp_tcb *l_stcb = *stcb; 2402 struct sctp_inpcb *l_inp; 2403 struct sockaddr *to; 2404 struct sctp_pcb *ep; 2405 struct mbuf *m_sig; 2406 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2407 uint8_t *sig; 2408 uint8_t cookie_ok = 0; 2409 unsigned int sig_offset, cookie_offset; 2410 unsigned int cookie_len; 2411 struct timeval now; 2412 struct timeval time_expires; 2413 int notification = 0; 2414 struct sctp_nets *netl; 2415 int had_a_existing_tcb = 0; 2416 int send_int_conf = 0; 2417 2418 #ifdef INET 2419 struct sockaddr_in sin; 2420 2421 #endif 2422 #ifdef INET6 2423 struct sockaddr_in6 sin6; 2424 2425 #endif 2426 2427 SCTPDBG(SCTP_DEBUG_INPUT2, 2428 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2429 2430 if (inp_p == NULL) { 2431 return (NULL); 2432 } 2433 cookie = &cp->cookie; 2434 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2435 cookie_len = ntohs(cp->ch.chunk_length); 2436 2437 if ((cookie->peerport != sh->src_port) && 2438 (cookie->myport != sh->dest_port) && 2439 (cookie->my_vtag != sh->v_tag)) { 2440 /* 2441 * invalid ports or bad tag. Note that we always leave the 2442 * v_tag in the header in network order and when we stored 2443 * it in the my_vtag slot we also left it in network order. 2444 * This maintains the match even though it may be in the 2445 * opposite byte order of the machine :-> 2446 */ 2447 return (NULL); 2448 } 2449 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2450 sizeof(struct sctp_init_chunk) + 2451 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2452 /* cookie too small */ 2453 return (NULL); 2454 } 2455 /* 2456 * split off the signature into its own mbuf (since it should not be 2457 * calculated in the sctp_hmac_m() call). 2458 */ 2459 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2460 m_sig = m_split(m, sig_offset, M_NOWAIT); 2461 if (m_sig == NULL) { 2462 /* out of memory or ?? */ 2463 return (NULL); 2464 } 2465 #ifdef SCTP_MBUF_LOGGING 2466 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2467 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2468 } 2469 #endif 2470 2471 /* 2472 * compute the signature/digest for the cookie 2473 */ 2474 ep = &(*inp_p)->sctp_ep; 2475 l_inp = *inp_p; 2476 if (l_stcb) { 2477 SCTP_TCB_UNLOCK(l_stcb); 2478 } 2479 SCTP_INP_RLOCK(l_inp); 2480 if (l_stcb) { 2481 SCTP_TCB_LOCK(l_stcb); 2482 } 2483 /* which cookie is it? */ 2484 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2485 (ep->current_secret_number != ep->last_secret_number)) { 2486 /* it's the old cookie */ 2487 (void)sctp_hmac_m(SCTP_HMAC, 2488 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2489 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2490 } else { 2491 /* it's the current cookie */ 2492 (void)sctp_hmac_m(SCTP_HMAC, 2493 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2494 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2495 } 2496 /* get the signature */ 2497 SCTP_INP_RUNLOCK(l_inp); 2498 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2499 if (sig == NULL) { 2500 /* couldn't find signature */ 2501 sctp_m_freem(m_sig); 2502 return (NULL); 2503 } 2504 /* compare the received digest with the computed digest */ 2505 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2506 /* try the old cookie? */ 2507 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2508 (ep->current_secret_number != ep->last_secret_number)) { 2509 /* compute digest with old */ 2510 (void)sctp_hmac_m(SCTP_HMAC, 2511 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2512 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2513 /* compare */ 2514 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2515 cookie_ok = 1; 2516 } 2517 } else { 2518 cookie_ok = 1; 2519 } 2520 2521 /* 2522 * Now before we continue we must reconstruct our mbuf so that 2523 * normal processing of any other chunks will work. 2524 */ 2525 { 2526 struct mbuf *m_at; 2527 2528 m_at = m; 2529 while (SCTP_BUF_NEXT(m_at) != NULL) { 2530 m_at = SCTP_BUF_NEXT(m_at); 2531 } 2532 SCTP_BUF_NEXT(m_at) = m_sig; 2533 } 2534 2535 if (cookie_ok == 0) { 2536 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2537 SCTPDBG(SCTP_DEBUG_INPUT2, 2538 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2539 (uint32_t) offset, cookie_offset, sig_offset); 2540 return (NULL); 2541 } 2542 /* 2543 * check the cookie timestamps to be sure it's not stale 2544 */ 2545 (void)SCTP_GETTIME_TIMEVAL(&now); 2546 /* Expire time is in Ticks, so we convert to seconds */ 2547 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2548 time_expires.tv_usec = cookie->time_entered.tv_usec; 2549 /* 2550 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2551 * is undefined. 2552 */ 2553 if (timevalcmp(&now, &time_expires, >)) { 2554 /* cookie is stale! */ 2555 struct mbuf *op_err; 2556 struct sctp_stale_cookie_msg *scm; 2557 uint32_t tim; 2558 2559 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2560 0, M_NOWAIT, 1, MT_DATA); 2561 if (op_err == NULL) { 2562 /* FOOBAR */ 2563 return (NULL); 2564 } 2565 /* Set the len */ 2566 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2567 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2568 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2569 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2570 (sizeof(uint32_t)))); 2571 /* seconds to usec */ 2572 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2573 /* add in usec */ 2574 if (tim == 0) 2575 tim = now.tv_usec - cookie->time_entered.tv_usec; 2576 scm->time_usec = htonl(tim); 2577 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2578 mflowtype, mflowid, l_inp->fibnum, 2579 vrf_id, port); 2580 return (NULL); 2581 } 2582 /* 2583 * Now we must see with the lookup address if we have an existing 2584 * asoc. This will only happen if we were in the COOKIE-WAIT state 2585 * and a INIT collided with us and somewhere the peer sent the 2586 * cookie on another address besides the single address our assoc 2587 * had for him. In this case we will have one of the tie-tags set at 2588 * least AND the address field in the cookie can be used to look it 2589 * up. 2590 */ 2591 to = NULL; 2592 switch (cookie->addr_type) { 2593 #ifdef INET6 2594 case SCTP_IPV6_ADDRESS: 2595 memset(&sin6, 0, sizeof(sin6)); 2596 sin6.sin6_family = AF_INET6; 2597 sin6.sin6_len = sizeof(sin6); 2598 sin6.sin6_port = sh->src_port; 2599 sin6.sin6_scope_id = cookie->scope_id; 2600 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2601 sizeof(sin6.sin6_addr.s6_addr)); 2602 to = (struct sockaddr *)&sin6; 2603 break; 2604 #endif 2605 #ifdef INET 2606 case SCTP_IPV4_ADDRESS: 2607 memset(&sin, 0, sizeof(sin)); 2608 sin.sin_family = AF_INET; 2609 sin.sin_len = sizeof(sin); 2610 sin.sin_port = sh->src_port; 2611 sin.sin_addr.s_addr = cookie->address[0]; 2612 to = (struct sockaddr *)&sin; 2613 break; 2614 #endif 2615 default: 2616 /* This should not happen */ 2617 return (NULL); 2618 } 2619 if (*stcb == NULL) { 2620 /* Yep, lets check */ 2621 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2622 if (*stcb == NULL) { 2623 /* 2624 * We should have only got back the same inp. If we 2625 * got back a different ep we have a problem. The 2626 * original findep got back l_inp and now 2627 */ 2628 if (l_inp != *inp_p) { 2629 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2630 } 2631 } else { 2632 if (*locked_tcb == NULL) { 2633 /* 2634 * In this case we found the assoc only 2635 * after we locked the create lock. This 2636 * means we are in a colliding case and we 2637 * must make sure that we unlock the tcb if 2638 * its one of the cases where we throw away 2639 * the incoming packets. 2640 */ 2641 *locked_tcb = *stcb; 2642 2643 /* 2644 * We must also increment the inp ref count 2645 * since the ref_count flags was set when we 2646 * did not find the TCB, now we found it 2647 * which reduces the refcount.. we must 2648 * raise it back out to balance it all :-) 2649 */ 2650 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2651 if ((*stcb)->sctp_ep != l_inp) { 2652 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2653 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2654 } 2655 } 2656 } 2657 } 2658 cookie_len -= SCTP_SIGNATURE_SIZE; 2659 if (*stcb == NULL) { 2660 /* this is the "normal" case... get a new TCB */ 2661 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2662 cookie, cookie_len, *inp_p, 2663 netp, to, ¬ification, 2664 auth_skipped, auth_offset, auth_len, 2665 mflowtype, mflowid, 2666 vrf_id, port); 2667 } else { 2668 /* this is abnormal... cookie-echo on existing TCB */ 2669 had_a_existing_tcb = 1; 2670 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2671 src, dst, sh, 2672 cookie, cookie_len, *inp_p, *stcb, netp, to, 2673 ¬ification, auth_skipped, auth_offset, auth_len, 2674 mflowtype, mflowid, 2675 vrf_id, port); 2676 } 2677 2678 if (*stcb == NULL) { 2679 /* still no TCB... must be bad cookie-echo */ 2680 return (NULL); 2681 } 2682 if (*netp != NULL) { 2683 (*netp)->flowtype = mflowtype; 2684 (*netp)->flowid = mflowid; 2685 } 2686 /* 2687 * Ok, we built an association so confirm the address we sent the 2688 * INIT-ACK to. 2689 */ 2690 netl = sctp_findnet(*stcb, to); 2691 /* 2692 * This code should in theory NOT run but 2693 */ 2694 if (netl == NULL) { 2695 /* TSNH! Huh, why do I need to add this address here? */ 2696 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2697 return (NULL); 2698 } 2699 netl = sctp_findnet(*stcb, to); 2700 } 2701 if (netl) { 2702 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2703 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2704 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2705 netl); 2706 send_int_conf = 1; 2707 } 2708 } 2709 sctp_start_net_timers(*stcb); 2710 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2711 if (!had_a_existing_tcb || 2712 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2713 /* 2714 * If we have a NEW cookie or the connect never 2715 * reached the connected state during collision we 2716 * must do the TCP accept thing. 2717 */ 2718 struct socket *so, *oso; 2719 struct sctp_inpcb *inp; 2720 2721 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2722 /* 2723 * For a restart we will keep the same 2724 * socket, no need to do anything. I THINK!! 2725 */ 2726 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2727 if (send_int_conf) { 2728 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2729 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2730 } 2731 return (m); 2732 } 2733 oso = (*inp_p)->sctp_socket; 2734 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2735 SCTP_TCB_UNLOCK((*stcb)); 2736 CURVNET_SET(oso->so_vnet); 2737 so = sonewconn(oso, 0 2738 ); 2739 CURVNET_RESTORE(); 2740 SCTP_TCB_LOCK((*stcb)); 2741 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2742 2743 if (so == NULL) { 2744 struct mbuf *op_err; 2745 2746 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2747 struct socket *pcb_so; 2748 2749 #endif 2750 /* Too many sockets */ 2751 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2752 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2753 sctp_abort_association(*inp_p, NULL, m, iphlen, 2754 src, dst, sh, op_err, 2755 mflowtype, mflowid, 2756 vrf_id, port); 2757 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2758 pcb_so = SCTP_INP_SO(*inp_p); 2759 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2760 SCTP_TCB_UNLOCK((*stcb)); 2761 SCTP_SOCKET_LOCK(pcb_so, 1); 2762 SCTP_TCB_LOCK((*stcb)); 2763 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2764 #endif 2765 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2766 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2768 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2769 #endif 2770 return (NULL); 2771 } 2772 inp = (struct sctp_inpcb *)so->so_pcb; 2773 SCTP_INP_INCR_REF(inp); 2774 /* 2775 * We add the unbound flag here so that if we get an 2776 * soabort() before we get the move_pcb done, we 2777 * will properly cleanup. 2778 */ 2779 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2780 SCTP_PCB_FLAGS_CONNECTED | 2781 SCTP_PCB_FLAGS_IN_TCPPOOL | 2782 SCTP_PCB_FLAGS_UNBOUND | 2783 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2784 SCTP_PCB_FLAGS_DONT_WAKE); 2785 inp->sctp_features = (*inp_p)->sctp_features; 2786 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2787 inp->sctp_socket = so; 2788 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2789 inp->max_cwnd = (*inp_p)->max_cwnd; 2790 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2791 inp->ecn_supported = (*inp_p)->ecn_supported; 2792 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2793 inp->auth_supported = (*inp_p)->auth_supported; 2794 inp->asconf_supported = (*inp_p)->asconf_supported; 2795 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2796 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2797 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2798 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2799 inp->sctp_context = (*inp_p)->sctp_context; 2800 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2801 inp->fibnum = (*inp_p)->fibnum; 2802 inp->inp_starting_point_for_iterator = NULL; 2803 /* 2804 * copy in the authentication parameters from the 2805 * original endpoint 2806 */ 2807 if (inp->sctp_ep.local_hmacs) 2808 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2809 inp->sctp_ep.local_hmacs = 2810 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2811 if (inp->sctp_ep.local_auth_chunks) 2812 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2813 inp->sctp_ep.local_auth_chunks = 2814 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2815 2816 /* 2817 * Now we must move it from one hash table to 2818 * another and get the tcb in the right place. 2819 */ 2820 2821 /* 2822 * This is where the one-2-one socket is put into 2823 * the accept state waiting for the accept! 2824 */ 2825 if (*stcb) { 2826 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2827 } 2828 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2829 2830 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2831 SCTP_TCB_UNLOCK((*stcb)); 2832 2833 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2834 0); 2835 SCTP_TCB_LOCK((*stcb)); 2836 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2837 2838 2839 /* 2840 * now we must check to see if we were aborted while 2841 * the move was going on and the lock/unlock 2842 * happened. 2843 */ 2844 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2845 /* 2846 * yep it was, we leave the assoc attached 2847 * to the socket since the sctp_inpcb_free() 2848 * call will send an abort for us. 2849 */ 2850 SCTP_INP_DECR_REF(inp); 2851 return (NULL); 2852 } 2853 SCTP_INP_DECR_REF(inp); 2854 /* Switch over to the new guy */ 2855 *inp_p = inp; 2856 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2857 if (send_int_conf) { 2858 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2859 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2860 } 2861 /* 2862 * Pull it from the incomplete queue and wake the 2863 * guy 2864 */ 2865 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2866 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2867 SCTP_TCB_UNLOCK((*stcb)); 2868 SCTP_SOCKET_LOCK(so, 1); 2869 #endif 2870 soisconnected(so); 2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2872 SCTP_TCB_LOCK((*stcb)); 2873 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2874 SCTP_SOCKET_UNLOCK(so, 1); 2875 #endif 2876 return (m); 2877 } 2878 } 2879 if (notification) { 2880 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2881 } 2882 if (send_int_conf) { 2883 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2884 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2885 } 2886 return (m); 2887 } 2888 2889 static void 2890 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2891 struct sctp_tcb *stcb, struct sctp_nets *net) 2892 { 2893 /* cp must not be used, others call this without a c-ack :-) */ 2894 struct sctp_association *asoc; 2895 2896 SCTPDBG(SCTP_DEBUG_INPUT2, 2897 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2898 if ((stcb == NULL) || (net == NULL)) { 2899 return; 2900 } 2901 asoc = &stcb->asoc; 2902 2903 sctp_stop_all_cookie_timers(stcb); 2904 /* process according to association state */ 2905 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2906 /* state change only needed when I am in right state */ 2907 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2908 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2909 sctp_start_net_timers(stcb); 2910 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2911 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2912 stcb->sctp_ep, stcb, asoc->primary_destination); 2913 2914 } 2915 /* update RTO */ 2916 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2917 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2918 if (asoc->overall_error_count == 0) { 2919 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2920 &asoc->time_entered, sctp_align_safe_nocopy, 2921 SCTP_RTT_FROM_NON_DATA); 2922 } 2923 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2924 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2925 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2926 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2927 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2928 struct socket *so; 2929 2930 #endif 2931 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2932 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2933 so = SCTP_INP_SO(stcb->sctp_ep); 2934 atomic_add_int(&stcb->asoc.refcnt, 1); 2935 SCTP_TCB_UNLOCK(stcb); 2936 SCTP_SOCKET_LOCK(so, 1); 2937 SCTP_TCB_LOCK(stcb); 2938 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2939 #endif 2940 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2941 soisconnected(stcb->sctp_socket); 2942 } 2943 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2944 SCTP_SOCKET_UNLOCK(so, 1); 2945 #endif 2946 } 2947 /* 2948 * since we did not send a HB make sure we don't double 2949 * things 2950 */ 2951 net->hb_responded = 1; 2952 2953 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2954 /* 2955 * We don't need to do the asconf thing, nor hb or 2956 * autoclose if the socket is closed. 2957 */ 2958 goto closed_socket; 2959 } 2960 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2961 stcb, net); 2962 2963 2964 if (stcb->asoc.sctp_autoclose_ticks && 2965 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2966 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2967 stcb->sctp_ep, stcb, NULL); 2968 } 2969 /* 2970 * send ASCONF if parameters are pending and ASCONFs are 2971 * allowed (eg. addresses changed when init/cookie echo were 2972 * in flight) 2973 */ 2974 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2975 (stcb->asoc.asconf_supported == 1) && 2976 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2977 #ifdef SCTP_TIMER_BASED_ASCONF 2978 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2979 stcb->sctp_ep, stcb, 2980 stcb->asoc.primary_destination); 2981 #else 2982 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2983 SCTP_ADDR_NOT_LOCKED); 2984 #endif 2985 } 2986 } 2987 closed_socket: 2988 /* Toss the cookie if I can */ 2989 sctp_toss_old_cookies(stcb, asoc); 2990 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2991 /* Restart the timer if we have pending data */ 2992 struct sctp_tmit_chunk *chk; 2993 2994 chk = TAILQ_FIRST(&asoc->sent_queue); 2995 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2996 } 2997 } 2998 2999 static void 3000 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3001 struct sctp_tcb *stcb) 3002 { 3003 struct sctp_nets *net; 3004 struct sctp_tmit_chunk *lchk; 3005 struct sctp_ecne_chunk bkup; 3006 uint8_t override_bit; 3007 uint32_t tsn, window_data_tsn; 3008 int len; 3009 unsigned int pkt_cnt; 3010 3011 len = ntohs(cp->ch.chunk_length); 3012 if ((len != sizeof(struct sctp_ecne_chunk)) && 3013 (len != sizeof(struct old_sctp_ecne_chunk))) { 3014 return; 3015 } 3016 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3017 /* Its the old format */ 3018 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3019 bkup.num_pkts_since_cwr = htonl(1); 3020 cp = &bkup; 3021 } 3022 SCTP_STAT_INCR(sctps_recvecne); 3023 tsn = ntohl(cp->tsn); 3024 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3025 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3026 if (lchk == NULL) { 3027 window_data_tsn = stcb->asoc.sending_seq - 1; 3028 } else { 3029 window_data_tsn = lchk->rec.data.TSN_seq; 3030 } 3031 3032 /* Find where it was sent to if possible. */ 3033 net = NULL; 3034 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3035 if (lchk->rec.data.TSN_seq == tsn) { 3036 net = lchk->whoTo; 3037 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3038 break; 3039 } 3040 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3041 break; 3042 } 3043 } 3044 if (net == NULL) { 3045 /* 3046 * What to do. A previous send of a CWR was possibly lost. 3047 * See how old it is, we may have it marked on the actual 3048 * net. 3049 */ 3050 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3051 if (tsn == net->last_cwr_tsn) { 3052 /* Found him, send it off */ 3053 break; 3054 } 3055 } 3056 if (net == NULL) { 3057 /* 3058 * If we reach here, we need to send a special CWR 3059 * that says hey, we did this a long time ago and 3060 * you lost the response. 3061 */ 3062 net = TAILQ_FIRST(&stcb->asoc.nets); 3063 if (net == NULL) { 3064 /* TSNH */ 3065 return; 3066 } 3067 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3068 } else { 3069 override_bit = 0; 3070 } 3071 } else { 3072 override_bit = 0; 3073 } 3074 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3075 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3076 /* 3077 * JRS - Use the congestion control given in the pluggable 3078 * CC module 3079 */ 3080 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3081 /* 3082 * We reduce once every RTT. So we will only lower cwnd at 3083 * the next sending seq i.e. the window_data_tsn 3084 */ 3085 net->cwr_window_tsn = window_data_tsn; 3086 net->ecn_ce_pkt_cnt += pkt_cnt; 3087 net->lost_cnt = pkt_cnt; 3088 net->last_cwr_tsn = tsn; 3089 } else { 3090 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3091 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3092 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3093 /* 3094 * Another loss in the same window update how many 3095 * marks/packets lost we have had. 3096 */ 3097 int cnt = 1; 3098 3099 if (pkt_cnt > net->lost_cnt) { 3100 /* Should be the case */ 3101 cnt = (pkt_cnt - net->lost_cnt); 3102 net->ecn_ce_pkt_cnt += cnt; 3103 } 3104 net->lost_cnt = pkt_cnt; 3105 net->last_cwr_tsn = tsn; 3106 /* 3107 * Most CC functions will ignore this call, since we 3108 * are in-window yet of the initial CE the peer saw. 3109 */ 3110 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3111 } 3112 } 3113 /* 3114 * We always send a CWR this way if our previous one was lost our 3115 * peer will get an update, or if it is not time again to reduce we 3116 * still get the cwr to the peer. Note we set the override when we 3117 * could not find the TSN on the chunk or the destination network. 3118 */ 3119 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3120 } 3121 3122 static void 3123 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3124 { 3125 /* 3126 * Here we get a CWR from the peer. We must look in the outqueue and 3127 * make sure that we have a covered ECNE in the control chunk part. 3128 * If so remove it. 3129 */ 3130 struct sctp_tmit_chunk *chk; 3131 struct sctp_ecne_chunk *ecne; 3132 int override; 3133 uint32_t cwr_tsn; 3134 3135 cwr_tsn = ntohl(cp->tsn); 3136 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3137 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3138 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3139 continue; 3140 } 3141 if ((override == 0) && (chk->whoTo != net)) { 3142 /* Must be from the right src unless override is set */ 3143 continue; 3144 } 3145 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3146 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3147 /* this covers this ECNE, we can remove it */ 3148 stcb->asoc.ecn_echo_cnt_onq--; 3149 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3150 sctp_next); 3151 sctp_m_freem(chk->data); 3152 chk->data = NULL; 3153 stcb->asoc.ctrl_queue_cnt--; 3154 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3155 if (override == 0) { 3156 break; 3157 } 3158 } 3159 } 3160 } 3161 3162 static void 3163 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3164 struct sctp_tcb *stcb, struct sctp_nets *net) 3165 { 3166 struct sctp_association *asoc; 3167 3168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3169 struct socket *so; 3170 3171 #endif 3172 3173 SCTPDBG(SCTP_DEBUG_INPUT2, 3174 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3175 if (stcb == NULL) 3176 return; 3177 3178 asoc = &stcb->asoc; 3179 /* process according to association state */ 3180 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3181 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3182 SCTPDBG(SCTP_DEBUG_INPUT2, 3183 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3184 SCTP_TCB_UNLOCK(stcb); 3185 return; 3186 } 3187 /* notify upper layer protocol */ 3188 if (stcb->sctp_socket) { 3189 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3190 } 3191 #ifdef INVARIANTS 3192 if (!TAILQ_EMPTY(&asoc->send_queue) || 3193 !TAILQ_EMPTY(&asoc->sent_queue) || 3194 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3195 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3196 } 3197 #endif 3198 /* stop the timer */ 3199 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3200 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3201 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3202 /* free the TCB */ 3203 SCTPDBG(SCTP_DEBUG_INPUT2, 3204 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3206 so = SCTP_INP_SO(stcb->sctp_ep); 3207 atomic_add_int(&stcb->asoc.refcnt, 1); 3208 SCTP_TCB_UNLOCK(stcb); 3209 SCTP_SOCKET_LOCK(so, 1); 3210 SCTP_TCB_LOCK(stcb); 3211 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3212 #endif 3213 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3214 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3216 SCTP_SOCKET_UNLOCK(so, 1); 3217 #endif 3218 return; 3219 } 3220 3221 static int 3222 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3223 struct sctp_nets *net, uint8_t flg) 3224 { 3225 switch (desc->chunk_type) { 3226 case SCTP_DATA: 3227 /* find the tsn to resend (possibly */ 3228 { 3229 uint32_t tsn; 3230 struct sctp_tmit_chunk *tp1; 3231 3232 tsn = ntohl(desc->tsn_ifany); 3233 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3234 if (tp1->rec.data.TSN_seq == tsn) { 3235 /* found it */ 3236 break; 3237 } 3238 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3239 /* not found */ 3240 tp1 = NULL; 3241 break; 3242 } 3243 } 3244 if (tp1 == NULL) { 3245 /* 3246 * Do it the other way , aka without paying 3247 * attention to queue seq order. 3248 */ 3249 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3250 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3251 if (tp1->rec.data.TSN_seq == tsn) { 3252 /* found it */ 3253 break; 3254 } 3255 } 3256 } 3257 if (tp1 == NULL) { 3258 SCTP_STAT_INCR(sctps_pdrptsnnf); 3259 } 3260 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3261 uint8_t *ddp; 3262 3263 if (((flg & SCTP_BADCRC) == 0) && 3264 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3265 return (0); 3266 } 3267 if ((stcb->asoc.peers_rwnd == 0) && 3268 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3269 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3270 return (0); 3271 } 3272 if (stcb->asoc.peers_rwnd == 0 && 3273 (flg & SCTP_FROM_MIDDLE_BOX)) { 3274 SCTP_STAT_INCR(sctps_pdrpdizrw); 3275 return (0); 3276 } 3277 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3278 sizeof(struct sctp_data_chunk)); 3279 { 3280 unsigned int iii; 3281 3282 for (iii = 0; iii < sizeof(desc->data_bytes); 3283 iii++) { 3284 if (ddp[iii] != desc->data_bytes[iii]) { 3285 SCTP_STAT_INCR(sctps_pdrpbadd); 3286 return (-1); 3287 } 3288 } 3289 } 3290 3291 if (tp1->do_rtt) { 3292 /* 3293 * this guy had a RTO calculation 3294 * pending on it, cancel it 3295 */ 3296 if (tp1->whoTo->rto_needed == 0) { 3297 tp1->whoTo->rto_needed = 1; 3298 } 3299 tp1->do_rtt = 0; 3300 } 3301 SCTP_STAT_INCR(sctps_pdrpmark); 3302 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3303 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3304 /* 3305 * mark it as if we were doing a FR, since 3306 * we will be getting gap ack reports behind 3307 * the info from the router. 3308 */ 3309 tp1->rec.data.doing_fast_retransmit = 1; 3310 /* 3311 * mark the tsn with what sequences can 3312 * cause a new FR. 3313 */ 3314 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3315 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3316 } else { 3317 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3318 } 3319 3320 /* restart the timer */ 3321 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3322 stcb, tp1->whoTo, 3323 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3324 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3325 stcb, tp1->whoTo); 3326 3327 /* fix counts and things */ 3328 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3329 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3330 tp1->whoTo->flight_size, 3331 tp1->book_size, 3332 (uintptr_t) stcb, 3333 tp1->rec.data.TSN_seq); 3334 } 3335 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3336 sctp_flight_size_decrease(tp1); 3337 sctp_total_flight_decrease(stcb, tp1); 3338 } 3339 tp1->sent = SCTP_DATAGRAM_RESEND; 3340 } { 3341 /* audit code */ 3342 unsigned int audit; 3343 3344 audit = 0; 3345 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3346 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3347 audit++; 3348 } 3349 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3350 sctp_next) { 3351 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3352 audit++; 3353 } 3354 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3355 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3356 audit, stcb->asoc.sent_queue_retran_cnt); 3357 #ifndef SCTP_AUDITING_ENABLED 3358 stcb->asoc.sent_queue_retran_cnt = audit; 3359 #endif 3360 } 3361 } 3362 } 3363 break; 3364 case SCTP_ASCONF: 3365 { 3366 struct sctp_tmit_chunk *asconf; 3367 3368 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3369 sctp_next) { 3370 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3371 break; 3372 } 3373 } 3374 if (asconf) { 3375 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3376 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3377 asconf->sent = SCTP_DATAGRAM_RESEND; 3378 asconf->snd_count--; 3379 } 3380 } 3381 break; 3382 case SCTP_INITIATION: 3383 /* resend the INIT */ 3384 stcb->asoc.dropped_special_cnt++; 3385 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3386 /* 3387 * If we can get it in, in a few attempts we do 3388 * this, otherwise we let the timer fire. 3389 */ 3390 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3391 stcb, net, 3392 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3393 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3394 } 3395 break; 3396 case SCTP_SELECTIVE_ACK: 3397 case SCTP_NR_SELECTIVE_ACK: 3398 /* resend the sack */ 3399 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3400 break; 3401 case SCTP_HEARTBEAT_REQUEST: 3402 /* resend a demand HB */ 3403 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3404 /* 3405 * Only retransmit if we KNOW we wont destroy the 3406 * tcb 3407 */ 3408 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3409 } 3410 break; 3411 case SCTP_SHUTDOWN: 3412 sctp_send_shutdown(stcb, net); 3413 break; 3414 case SCTP_SHUTDOWN_ACK: 3415 sctp_send_shutdown_ack(stcb, net); 3416 break; 3417 case SCTP_COOKIE_ECHO: 3418 { 3419 struct sctp_tmit_chunk *cookie; 3420 3421 cookie = NULL; 3422 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3423 sctp_next) { 3424 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3425 break; 3426 } 3427 } 3428 if (cookie) { 3429 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3430 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3431 cookie->sent = SCTP_DATAGRAM_RESEND; 3432 sctp_stop_all_cookie_timers(stcb); 3433 } 3434 } 3435 break; 3436 case SCTP_COOKIE_ACK: 3437 sctp_send_cookie_ack(stcb); 3438 break; 3439 case SCTP_ASCONF_ACK: 3440 /* resend last asconf ack */ 3441 sctp_send_asconf_ack(stcb); 3442 break; 3443 case SCTP_FORWARD_CUM_TSN: 3444 send_forward_tsn(stcb, &stcb->asoc); 3445 break; 3446 /* can't do anything with these */ 3447 case SCTP_PACKET_DROPPED: 3448 case SCTP_INITIATION_ACK: /* this should not happen */ 3449 case SCTP_HEARTBEAT_ACK: 3450 case SCTP_ABORT_ASSOCIATION: 3451 case SCTP_OPERATION_ERROR: 3452 case SCTP_SHUTDOWN_COMPLETE: 3453 case SCTP_ECN_ECHO: 3454 case SCTP_ECN_CWR: 3455 default: 3456 break; 3457 } 3458 return (0); 3459 } 3460 3461 void 3462 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3463 { 3464 uint32_t i; 3465 uint16_t temp; 3466 3467 /* 3468 * We set things to 0xffff since this is the last delivered sequence 3469 * and we will be sending in 0 after the reset. 3470 */ 3471 3472 if (number_entries) { 3473 for (i = 0; i < number_entries; i++) { 3474 temp = ntohs(list[i]); 3475 if (temp >= stcb->asoc.streamincnt) { 3476 continue; 3477 } 3478 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3479 } 3480 } else { 3481 list = NULL; 3482 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3483 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3484 } 3485 } 3486 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3487 } 3488 3489 static void 3490 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3491 { 3492 uint32_t i; 3493 uint16_t temp; 3494 3495 if (number_entries > 0) { 3496 for (i = 0; i < number_entries; i++) { 3497 temp = ntohs(list[i]); 3498 if (temp >= stcb->asoc.streamoutcnt) { 3499 /* no such stream */ 3500 continue; 3501 } 3502 stcb->asoc.strmout[temp].next_sequence_send = 0; 3503 } 3504 } else { 3505 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3506 stcb->asoc.strmout[i].next_sequence_send = 0; 3507 } 3508 } 3509 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3510 } 3511 3512 static void 3513 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3514 { 3515 uint32_t i; 3516 uint16_t temp; 3517 3518 if (number_entries > 0) { 3519 for (i = 0; i < number_entries; i++) { 3520 temp = ntohs(list[i]); 3521 if (temp >= stcb->asoc.streamoutcnt) { 3522 /* no such stream */ 3523 continue; 3524 } 3525 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3526 } 3527 } else { 3528 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3529 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3530 } 3531 } 3532 } 3533 3534 3535 struct sctp_stream_reset_request * 3536 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3537 { 3538 struct sctp_association *asoc; 3539 struct sctp_chunkhdr *ch; 3540 struct sctp_stream_reset_request *r; 3541 struct sctp_tmit_chunk *chk; 3542 int len, clen; 3543 3544 asoc = &stcb->asoc; 3545 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3546 asoc->stream_reset_outstanding = 0; 3547 return (NULL); 3548 } 3549 if (stcb->asoc.str_reset == NULL) { 3550 asoc->stream_reset_outstanding = 0; 3551 return (NULL); 3552 } 3553 chk = stcb->asoc.str_reset; 3554 if (chk->data == NULL) { 3555 return (NULL); 3556 } 3557 if (bchk) { 3558 /* he wants a copy of the chk pointer */ 3559 *bchk = chk; 3560 } 3561 clen = chk->send_size; 3562 ch = mtod(chk->data, struct sctp_chunkhdr *); 3563 r = (struct sctp_stream_reset_request *)(ch + 1); 3564 if (ntohl(r->request_seq) == seq) { 3565 /* found it */ 3566 return (r); 3567 } 3568 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3569 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3570 /* move to the next one, there can only be a max of two */ 3571 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3572 if (ntohl(r->request_seq) == seq) { 3573 return (r); 3574 } 3575 } 3576 /* that seq is not here */ 3577 return (NULL); 3578 } 3579 3580 static void 3581 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3582 { 3583 struct sctp_association *asoc; 3584 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3585 3586 if (stcb->asoc.str_reset == NULL) { 3587 return; 3588 } 3589 asoc = &stcb->asoc; 3590 3591 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3592 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3593 TAILQ_REMOVE(&asoc->control_send_queue, 3594 chk, 3595 sctp_next); 3596 if (chk->data) { 3597 sctp_m_freem(chk->data); 3598 chk->data = NULL; 3599 } 3600 asoc->ctrl_queue_cnt--; 3601 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3602 /* sa_ignore NO_NULL_CHK */ 3603 stcb->asoc.str_reset = NULL; 3604 } 3605 3606 3607 static int 3608 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3609 uint32_t seq, uint32_t action, 3610 struct sctp_stream_reset_response *respin) 3611 { 3612 uint16_t type; 3613 int lparm_len; 3614 struct sctp_association *asoc = &stcb->asoc; 3615 struct sctp_tmit_chunk *chk; 3616 struct sctp_stream_reset_request *req_param; 3617 struct sctp_stream_reset_out_request *req_out_param; 3618 struct sctp_stream_reset_in_request *req_in_param; 3619 uint32_t number_entries; 3620 3621 if (asoc->stream_reset_outstanding == 0) { 3622 /* duplicate */ 3623 return (0); 3624 } 3625 if (seq == stcb->asoc.str_reset_seq_out) { 3626 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3627 if (req_param != NULL) { 3628 stcb->asoc.str_reset_seq_out++; 3629 type = ntohs(req_param->ph.param_type); 3630 lparm_len = ntohs(req_param->ph.param_length); 3631 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3632 int no_clear = 0; 3633 3634 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3635 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3636 asoc->stream_reset_out_is_outstanding = 0; 3637 if (asoc->stream_reset_outstanding) 3638 asoc->stream_reset_outstanding--; 3639 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3640 /* do it */ 3641 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3642 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3643 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3644 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3645 /* 3646 * Set it up so we don't stop 3647 * retransmitting 3648 */ 3649 stcb->asoc.str_reset_seq_out--; 3650 asoc->stream_reset_out_is_outstanding = 1; 3651 no_clear = 1; 3652 } else { 3653 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3654 } 3655 if (no_clear == 0) { 3656 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3657 } 3658 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3659 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3660 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3661 if (asoc->stream_reset_outstanding) 3662 asoc->stream_reset_outstanding--; 3663 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3664 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3665 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3666 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3667 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3668 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3669 } 3670 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3671 /* Ok we now may have more streams */ 3672 int num_stream; 3673 3674 num_stream = stcb->asoc.strm_pending_add_size; 3675 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3676 /* TSNH */ 3677 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3678 } 3679 stcb->asoc.strm_pending_add_size = 0; 3680 if (asoc->stream_reset_outstanding) 3681 asoc->stream_reset_outstanding--; 3682 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3683 /* Put the new streams into effect */ 3684 int i; 3685 3686 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3687 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3688 } 3689 asoc->streamoutcnt += num_stream; 3690 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3691 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3692 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3693 SCTP_STREAM_CHANGE_DENIED); 3694 } else { 3695 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3696 SCTP_STREAM_CHANGE_FAILED); 3697 } 3698 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3699 if (asoc->stream_reset_outstanding) 3700 asoc->stream_reset_outstanding--; 3701 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3702 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3703 SCTP_STREAM_CHANGE_DENIED); 3704 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3705 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3706 SCTP_STREAM_CHANGE_FAILED); 3707 } 3708 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3709 /** 3710 * a) Adopt the new in tsn. 3711 * b) reset the map 3712 * c) Adopt the new out-tsn 3713 */ 3714 struct sctp_stream_reset_response_tsn *resp; 3715 struct sctp_forward_tsn_chunk fwdtsn; 3716 int abort_flag = 0; 3717 3718 if (respin == NULL) { 3719 /* huh ? */ 3720 return (0); 3721 } 3722 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3723 return (0); 3724 } 3725 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3726 resp = (struct sctp_stream_reset_response_tsn *)respin; 3727 asoc->stream_reset_outstanding--; 3728 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3729 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3730 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3731 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3732 if (abort_flag) { 3733 return (1); 3734 } 3735 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3736 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3737 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3738 } 3739 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3740 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3741 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3742 3743 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3744 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3745 3746 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3747 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3748 3749 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3750 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3751 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3752 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3753 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3754 SCTP_ASSOC_RESET_DENIED); 3755 } else { 3756 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3757 SCTP_ASSOC_RESET_FAILED); 3758 } 3759 } 3760 /* get rid of the request and get the request flags */ 3761 if (asoc->stream_reset_outstanding == 0) { 3762 sctp_clean_up_stream_reset(stcb); 3763 } 3764 } 3765 } 3766 if (asoc->stream_reset_outstanding == 0) { 3767 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3768 } 3769 return (0); 3770 } 3771 3772 static void 3773 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3774 struct sctp_tmit_chunk *chk, 3775 struct sctp_stream_reset_in_request *req, int trunc) 3776 { 3777 uint32_t seq; 3778 int len, i; 3779 int number_entries; 3780 uint16_t temp; 3781 3782 /* 3783 * peer wants me to send a str-reset to him for my outgoing seq's if 3784 * seq_in is right. 3785 */ 3786 struct sctp_association *asoc = &stcb->asoc; 3787 3788 seq = ntohl(req->request_seq); 3789 if (asoc->str_reset_seq_in == seq) { 3790 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3791 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3792 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3793 } else if (trunc) { 3794 /* Can't do it, since they exceeded our buffer size */ 3795 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3796 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3797 len = ntohs(req->ph.param_length); 3798 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3799 if (number_entries) { 3800 for (i = 0; i < number_entries; i++) { 3801 temp = ntohs(req->list_of_streams[i]); 3802 if (temp >= stcb->asoc.streamoutcnt) { 3803 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3804 goto bad_boy; 3805 } 3806 req->list_of_streams[i] = temp; 3807 } 3808 for (i = 0; i < number_entries; i++) { 3809 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3810 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3811 } 3812 } 3813 } else { 3814 /* Its all */ 3815 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3816 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3817 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3818 } 3819 } 3820 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3821 } else { 3822 /* Can't do it, since we have sent one out */ 3823 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3824 } 3825 bad_boy: 3826 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3827 asoc->str_reset_seq_in++; 3828 } else if (asoc->str_reset_seq_in - 1 == seq) { 3829 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3830 } else if (asoc->str_reset_seq_in - 2 == seq) { 3831 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3832 } else { 3833 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3834 } 3835 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3836 } 3837 3838 static int 3839 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3840 struct sctp_tmit_chunk *chk, 3841 struct sctp_stream_reset_tsn_request *req) 3842 { 3843 /* reset all in and out and update the tsn */ 3844 /* 3845 * A) reset my str-seq's on in and out. B) Select a receive next, 3846 * and set cum-ack to it. Also process this selected number as a 3847 * fwd-tsn as well. C) set in the response my next sending seq. 3848 */ 3849 struct sctp_forward_tsn_chunk fwdtsn; 3850 struct sctp_association *asoc = &stcb->asoc; 3851 int abort_flag = 0; 3852 uint32_t seq; 3853 3854 seq = ntohl(req->request_seq); 3855 if (asoc->str_reset_seq_in == seq) { 3856 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3857 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3858 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3859 } else { 3860 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3861 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3862 fwdtsn.ch.chunk_flags = 0; 3863 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3864 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3865 if (abort_flag) { 3866 return (1); 3867 } 3868 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3869 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3870 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3871 } 3872 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3873 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3874 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3875 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3876 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3877 atomic_add_int(&asoc->sending_seq, 1); 3878 /* save off historical data for retrans */ 3879 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3880 asoc->last_sending_seq[0] = asoc->sending_seq; 3881 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3882 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3883 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3884 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3885 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3886 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3887 } 3888 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3889 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3890 asoc->str_reset_seq_in++; 3891 } else if (asoc->str_reset_seq_in - 1 == seq) { 3892 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3893 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3894 } else if (asoc->str_reset_seq_in - 2 == seq) { 3895 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3896 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3897 } else { 3898 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3899 } 3900 return (0); 3901 } 3902 3903 static void 3904 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3905 struct sctp_tmit_chunk *chk, 3906 struct sctp_stream_reset_out_request *req, int trunc) 3907 { 3908 uint32_t seq, tsn; 3909 int number_entries, len; 3910 struct sctp_association *asoc = &stcb->asoc; 3911 3912 seq = ntohl(req->request_seq); 3913 3914 /* now if its not a duplicate we process it */ 3915 if (asoc->str_reset_seq_in == seq) { 3916 len = ntohs(req->ph.param_length); 3917 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3918 /* 3919 * the sender is resetting, handle the list issue.. we must 3920 * a) verify if we can do the reset, if so no problem b) If 3921 * we can't do the reset we must copy the request. c) queue 3922 * it, and setup the data in processor to trigger it off 3923 * when needed and dequeue all the queued data. 3924 */ 3925 tsn = ntohl(req->send_reset_at_tsn); 3926 3927 /* move the reset action back one */ 3928 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3929 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3930 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3931 } else if (trunc) { 3932 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3933 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3934 /* we can do it now */ 3935 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3936 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3937 } else { 3938 /* 3939 * we must queue it up and thus wait for the TSN's 3940 * to arrive that are at or before tsn 3941 */ 3942 struct sctp_stream_reset_list *liste; 3943 int siz; 3944 3945 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3946 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3947 siz, SCTP_M_STRESET); 3948 if (liste == NULL) { 3949 /* gak out of memory */ 3950 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3951 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3952 return; 3953 } 3954 liste->seq = seq; 3955 liste->tsn = tsn; 3956 liste->number_entries = number_entries; 3957 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3958 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3959 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3960 } 3961 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3962 asoc->str_reset_seq_in++; 3963 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3964 /* 3965 * one seq back, just echo back last action since my 3966 * response was lost. 3967 */ 3968 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3969 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3970 /* 3971 * two seq back, just echo back last action since my 3972 * response was lost. 3973 */ 3974 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3975 } else { 3976 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3977 } 3978 } 3979 3980 static void 3981 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3982 struct sctp_stream_reset_add_strm *str_add) 3983 { 3984 /* 3985 * Peer is requesting to add more streams. If its within our 3986 * max-streams we will allow it. 3987 */ 3988 uint32_t num_stream, i; 3989 uint32_t seq; 3990 struct sctp_association *asoc = &stcb->asoc; 3991 struct sctp_queued_to_read *ctl, *nctl; 3992 3993 /* Get the number. */ 3994 seq = ntohl(str_add->request_seq); 3995 num_stream = ntohs(str_add->number_of_streams); 3996 /* Now what would be the new total? */ 3997 if (asoc->str_reset_seq_in == seq) { 3998 num_stream += stcb->asoc.streamincnt; 3999 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4000 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4001 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4002 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4003 (num_stream > 0xffff)) { 4004 /* We must reject it they ask for to many */ 4005 denied: 4006 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4007 } else { 4008 /* Ok, we can do that :-) */ 4009 struct sctp_stream_in *oldstrm; 4010 4011 /* save off the old */ 4012 oldstrm = stcb->asoc.strmin; 4013 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4014 (num_stream * sizeof(struct sctp_stream_in)), 4015 SCTP_M_STRMI); 4016 if (stcb->asoc.strmin == NULL) { 4017 stcb->asoc.strmin = oldstrm; 4018 goto denied; 4019 } 4020 /* copy off the old data */ 4021 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4022 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4023 stcb->asoc.strmin[i].stream_no = i; 4024 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4025 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4026 /* now anything on those queues? */ 4027 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4028 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4029 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4030 } 4031 } 4032 /* Init the new streams */ 4033 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4034 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4035 stcb->asoc.strmin[i].stream_no = i; 4036 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4037 stcb->asoc.strmin[i].delivery_started = 0; 4038 } 4039 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4040 /* update the size */ 4041 stcb->asoc.streamincnt = num_stream; 4042 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4043 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4044 } 4045 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4046 asoc->str_reset_seq_in++; 4047 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4048 /* 4049 * one seq back, just echo back last action since my 4050 * response was lost. 4051 */ 4052 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4053 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4054 /* 4055 * two seq back, just echo back last action since my 4056 * response was lost. 4057 */ 4058 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4059 } else { 4060 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4061 4062 } 4063 } 4064 4065 static void 4066 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4067 struct sctp_stream_reset_add_strm *str_add) 4068 { 4069 /* 4070 * Peer is requesting to add more streams. If its within our 4071 * max-streams we will allow it. 4072 */ 4073 uint16_t num_stream; 4074 uint32_t seq; 4075 struct sctp_association *asoc = &stcb->asoc; 4076 4077 /* Get the number. */ 4078 seq = ntohl(str_add->request_seq); 4079 num_stream = ntohs(str_add->number_of_streams); 4080 /* Now what would be the new total? */ 4081 if (asoc->str_reset_seq_in == seq) { 4082 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4083 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4084 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4085 } else if (stcb->asoc.stream_reset_outstanding) { 4086 /* We must reject it we have something pending */ 4087 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4088 } else { 4089 /* Ok, we can do that :-) */ 4090 int mychk; 4091 4092 mychk = stcb->asoc.streamoutcnt; 4093 mychk += num_stream; 4094 if (mychk < 0x10000) { 4095 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4096 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4097 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4098 } 4099 } else { 4100 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4101 } 4102 } 4103 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4104 asoc->str_reset_seq_in++; 4105 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4106 /* 4107 * one seq back, just echo back last action since my 4108 * response was lost. 4109 */ 4110 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4111 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4112 /* 4113 * two seq back, just echo back last action since my 4114 * response was lost. 4115 */ 4116 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4117 } else { 4118 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4119 } 4120 } 4121 4122 #ifdef __GNUC__ 4123 __attribute__((noinline)) 4124 #endif 4125 static int 4126 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4127 struct sctp_chunkhdr *ch_req) 4128 { 4129 uint16_t remaining_length, param_len, ptype; 4130 struct sctp_paramhdr pstore; 4131 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4132 uint32_t seq = 0; 4133 int num_req = 0; 4134 int trunc = 0; 4135 struct sctp_tmit_chunk *chk; 4136 struct sctp_chunkhdr *ch; 4137 struct sctp_paramhdr *ph; 4138 int ret_code = 0; 4139 int num_param = 0; 4140 4141 /* now it may be a reset or a reset-response */ 4142 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4143 4144 /* setup for adding the response */ 4145 sctp_alloc_a_chunk(stcb, chk); 4146 if (chk == NULL) { 4147 return (ret_code); 4148 } 4149 chk->copy_by_ref = 0; 4150 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4151 chk->rec.chunk_id.can_take_data = 0; 4152 chk->flags = 0; 4153 chk->asoc = &stcb->asoc; 4154 chk->no_fr_allowed = 0; 4155 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4156 chk->book_size_scale = 0; 4157 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4158 if (chk->data == NULL) { 4159 strres_nochunk: 4160 if (chk->data) { 4161 sctp_m_freem(chk->data); 4162 chk->data = NULL; 4163 } 4164 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4165 return (ret_code); 4166 } 4167 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4168 4169 /* setup chunk parameters */ 4170 chk->sent = SCTP_DATAGRAM_UNSENT; 4171 chk->snd_count = 0; 4172 chk->whoTo = NULL; 4173 4174 ch = mtod(chk->data, struct sctp_chunkhdr *); 4175 ch->chunk_type = SCTP_STREAM_RESET; 4176 ch->chunk_flags = 0; 4177 ch->chunk_length = htons(chk->send_size); 4178 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4179 offset += sizeof(struct sctp_chunkhdr); 4180 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4181 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4182 if (ph == NULL) { 4183 /* TSNH */ 4184 break; 4185 } 4186 param_len = ntohs(ph->param_length); 4187 if ((param_len > remaining_length) || 4188 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4189 /* bad parameter length */ 4190 break; 4191 } 4192 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4193 (uint8_t *) & cstore); 4194 if (ph == NULL) { 4195 /* TSNH */ 4196 break; 4197 } 4198 ptype = ntohs(ph->param_type); 4199 num_param++; 4200 if (param_len > sizeof(cstore)) { 4201 trunc = 1; 4202 } else { 4203 trunc = 0; 4204 } 4205 if (num_param > SCTP_MAX_RESET_PARAMS) { 4206 /* hit the max of parameters already sorry.. */ 4207 break; 4208 } 4209 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4210 struct sctp_stream_reset_out_request *req_out; 4211 4212 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4213 break; 4214 } 4215 req_out = (struct sctp_stream_reset_out_request *)ph; 4216 num_req++; 4217 if (stcb->asoc.stream_reset_outstanding) { 4218 seq = ntohl(req_out->response_seq); 4219 if (seq == stcb->asoc.str_reset_seq_out) { 4220 /* implicit ack */ 4221 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4222 } 4223 } 4224 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4225 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4226 struct sctp_stream_reset_add_strm *str_add; 4227 4228 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4229 break; 4230 } 4231 str_add = (struct sctp_stream_reset_add_strm *)ph; 4232 num_req++; 4233 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4234 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4235 struct sctp_stream_reset_add_strm *str_add; 4236 4237 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4238 break; 4239 } 4240 str_add = (struct sctp_stream_reset_add_strm *)ph; 4241 num_req++; 4242 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4243 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4244 struct sctp_stream_reset_in_request *req_in; 4245 4246 num_req++; 4247 req_in = (struct sctp_stream_reset_in_request *)ph; 4248 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4249 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4250 struct sctp_stream_reset_tsn_request *req_tsn; 4251 4252 num_req++; 4253 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4254 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4255 ret_code = 1; 4256 goto strres_nochunk; 4257 } 4258 /* no more */ 4259 break; 4260 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4261 struct sctp_stream_reset_response *resp; 4262 uint32_t result; 4263 4264 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4265 break; 4266 } 4267 resp = (struct sctp_stream_reset_response *)ph; 4268 seq = ntohl(resp->response_seq); 4269 result = ntohl(resp->result); 4270 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4271 ret_code = 1; 4272 goto strres_nochunk; 4273 } 4274 } else { 4275 break; 4276 } 4277 offset += SCTP_SIZE32(param_len); 4278 if (remaining_length >= SCTP_SIZE32(param_len)) { 4279 remaining_length -= SCTP_SIZE32(param_len); 4280 } else { 4281 remaining_length = 0; 4282 } 4283 } 4284 if (num_req == 0) { 4285 /* we have no response free the stuff */ 4286 goto strres_nochunk; 4287 } 4288 /* ok we have a chunk to link in */ 4289 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4290 chk, 4291 sctp_next); 4292 stcb->asoc.ctrl_queue_cnt++; 4293 return (ret_code); 4294 } 4295 4296 /* 4297 * Handle a router or endpoints report of a packet loss, there are two ways 4298 * to handle this, either we get the whole packet and must disect it 4299 * ourselves (possibly with truncation and or corruption) or it is a summary 4300 * from a middle box that did the disectting for us. 4301 */ 4302 static void 4303 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4304 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4305 { 4306 uint32_t bottle_bw, on_queue; 4307 uint16_t trunc_len; 4308 unsigned int chlen; 4309 unsigned int at; 4310 struct sctp_chunk_desc desc; 4311 struct sctp_chunkhdr *ch; 4312 4313 chlen = ntohs(cp->ch.chunk_length); 4314 chlen -= sizeof(struct sctp_pktdrop_chunk); 4315 /* XXX possible chlen underflow */ 4316 if (chlen == 0) { 4317 ch = NULL; 4318 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4319 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4320 } else { 4321 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4322 chlen -= sizeof(struct sctphdr); 4323 /* XXX possible chlen underflow */ 4324 memset(&desc, 0, sizeof(desc)); 4325 } 4326 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4327 if (trunc_len > limit) { 4328 trunc_len = limit; 4329 } 4330 /* now the chunks themselves */ 4331 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4332 desc.chunk_type = ch->chunk_type; 4333 /* get amount we need to move */ 4334 at = ntohs(ch->chunk_length); 4335 if (at < sizeof(struct sctp_chunkhdr)) { 4336 /* corrupt chunk, maybe at the end? */ 4337 SCTP_STAT_INCR(sctps_pdrpcrupt); 4338 break; 4339 } 4340 if (trunc_len == 0) { 4341 /* we are supposed to have all of it */ 4342 if (at > chlen) { 4343 /* corrupt skip it */ 4344 SCTP_STAT_INCR(sctps_pdrpcrupt); 4345 break; 4346 } 4347 } else { 4348 /* is there enough of it left ? */ 4349 if (desc.chunk_type == SCTP_DATA) { 4350 if (chlen < (sizeof(struct sctp_data_chunk) + 4351 sizeof(desc.data_bytes))) { 4352 break; 4353 } 4354 } else { 4355 if (chlen < sizeof(struct sctp_chunkhdr)) { 4356 break; 4357 } 4358 } 4359 } 4360 if (desc.chunk_type == SCTP_DATA) { 4361 /* can we get out the tsn? */ 4362 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4363 SCTP_STAT_INCR(sctps_pdrpmbda); 4364 4365 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4366 /* yep */ 4367 struct sctp_data_chunk *dcp; 4368 uint8_t *ddp; 4369 unsigned int iii; 4370 4371 dcp = (struct sctp_data_chunk *)ch; 4372 ddp = (uint8_t *) (dcp + 1); 4373 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4374 desc.data_bytes[iii] = ddp[iii]; 4375 } 4376 desc.tsn_ifany = dcp->dp.tsn; 4377 } else { 4378 /* nope we are done. */ 4379 SCTP_STAT_INCR(sctps_pdrpnedat); 4380 break; 4381 } 4382 } else { 4383 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4384 SCTP_STAT_INCR(sctps_pdrpmbct); 4385 } 4386 4387 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4388 SCTP_STAT_INCR(sctps_pdrppdbrk); 4389 break; 4390 } 4391 if (SCTP_SIZE32(at) > chlen) { 4392 break; 4393 } 4394 chlen -= SCTP_SIZE32(at); 4395 if (chlen < sizeof(struct sctp_chunkhdr)) { 4396 /* done, none left */ 4397 break; 4398 } 4399 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4400 } 4401 /* Now update any rwnd --- possibly */ 4402 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4403 /* From a peer, we get a rwnd report */ 4404 uint32_t a_rwnd; 4405 4406 SCTP_STAT_INCR(sctps_pdrpfehos); 4407 4408 bottle_bw = ntohl(cp->bottle_bw); 4409 on_queue = ntohl(cp->current_onq); 4410 if (bottle_bw && on_queue) { 4411 /* a rwnd report is in here */ 4412 if (bottle_bw > on_queue) 4413 a_rwnd = bottle_bw - on_queue; 4414 else 4415 a_rwnd = 0; 4416 4417 if (a_rwnd == 0) 4418 stcb->asoc.peers_rwnd = 0; 4419 else { 4420 if (a_rwnd > stcb->asoc.total_flight) { 4421 stcb->asoc.peers_rwnd = 4422 a_rwnd - stcb->asoc.total_flight; 4423 } else { 4424 stcb->asoc.peers_rwnd = 0; 4425 } 4426 if (stcb->asoc.peers_rwnd < 4427 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4428 /* SWS sender side engages */ 4429 stcb->asoc.peers_rwnd = 0; 4430 } 4431 } 4432 } 4433 } else { 4434 SCTP_STAT_INCR(sctps_pdrpfmbox); 4435 } 4436 4437 /* now middle boxes in sat networks get a cwnd bump */ 4438 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4439 (stcb->asoc.sat_t3_loss_recovery == 0) && 4440 (stcb->asoc.sat_network)) { 4441 /* 4442 * This is debateable but for sat networks it makes sense 4443 * Note if a T3 timer has went off, we will prohibit any 4444 * changes to cwnd until we exit the t3 loss recovery. 4445 */ 4446 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4447 net, cp, &bottle_bw, &on_queue); 4448 } 4449 } 4450 4451 /* 4452 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4453 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4454 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4455 * length of the complete packet outputs: - length: modified to remaining 4456 * length after control processing - netp: modified to new sctp_nets after 4457 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4458 * bad packet,...) otherwise return the tcb for this packet 4459 */ 4460 #ifdef __GNUC__ 4461 __attribute__((noinline)) 4462 #endif 4463 static struct sctp_tcb * 4464 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4465 struct sockaddr *src, struct sockaddr *dst, 4466 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4467 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4468 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4469 uint32_t vrf_id, uint16_t port) 4470 { 4471 struct sctp_association *asoc; 4472 struct mbuf *op_err; 4473 char msg[SCTP_DIAG_INFO_LEN]; 4474 uint32_t vtag_in; 4475 int num_chunks = 0; /* number of control chunks processed */ 4476 uint32_t chk_length; 4477 int ret; 4478 int abort_no_unlock = 0; 4479 int ecne_seen = 0; 4480 4481 /* 4482 * How big should this be, and should it be alloc'd? Lets try the 4483 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4484 * until we get into jumbo grams and such.. 4485 */ 4486 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4487 struct sctp_tcb *locked_tcb = stcb; 4488 int got_auth = 0; 4489 uint32_t auth_offset = 0, auth_len = 0; 4490 int auth_skipped = 0; 4491 int asconf_cnt = 0; 4492 4493 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4494 struct socket *so; 4495 4496 #endif 4497 4498 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4499 iphlen, *offset, length, (void *)stcb); 4500 4501 /* validate chunk header length... */ 4502 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4503 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4504 ntohs(ch->chunk_length)); 4505 if (locked_tcb) { 4506 SCTP_TCB_UNLOCK(locked_tcb); 4507 } 4508 return (NULL); 4509 } 4510 /* 4511 * validate the verification tag 4512 */ 4513 vtag_in = ntohl(sh->v_tag); 4514 4515 if (locked_tcb) { 4516 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4517 } 4518 if (ch->chunk_type == SCTP_INITIATION) { 4519 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4520 ntohs(ch->chunk_length), vtag_in); 4521 if (vtag_in != 0) { 4522 /* protocol error- silently discard... */ 4523 SCTP_STAT_INCR(sctps_badvtag); 4524 if (locked_tcb) { 4525 SCTP_TCB_UNLOCK(locked_tcb); 4526 } 4527 return (NULL); 4528 } 4529 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4530 /* 4531 * If there is no stcb, skip the AUTH chunk and process 4532 * later after a stcb is found (to validate the lookup was 4533 * valid. 4534 */ 4535 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4536 (stcb == NULL) && 4537 (inp->auth_supported == 1)) { 4538 /* save this chunk for later processing */ 4539 auth_skipped = 1; 4540 auth_offset = *offset; 4541 auth_len = ntohs(ch->chunk_length); 4542 4543 /* (temporarily) move past this chunk */ 4544 *offset += SCTP_SIZE32(auth_len); 4545 if (*offset >= length) { 4546 /* no more data left in the mbuf chain */ 4547 *offset = length; 4548 if (locked_tcb) { 4549 SCTP_TCB_UNLOCK(locked_tcb); 4550 } 4551 return (NULL); 4552 } 4553 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4554 sizeof(struct sctp_chunkhdr), chunk_buf); 4555 } 4556 if (ch == NULL) { 4557 /* Help */ 4558 *offset = length; 4559 if (locked_tcb) { 4560 SCTP_TCB_UNLOCK(locked_tcb); 4561 } 4562 return (NULL); 4563 } 4564 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4565 goto process_control_chunks; 4566 } 4567 /* 4568 * first check if it's an ASCONF with an unknown src addr we 4569 * need to look inside to find the association 4570 */ 4571 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4572 struct sctp_chunkhdr *asconf_ch = ch; 4573 uint32_t asconf_offset = 0, asconf_len = 0; 4574 4575 /* inp's refcount may be reduced */ 4576 SCTP_INP_INCR_REF(inp); 4577 4578 asconf_offset = *offset; 4579 do { 4580 asconf_len = ntohs(asconf_ch->chunk_length); 4581 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4582 break; 4583 stcb = sctp_findassociation_ep_asconf(m, 4584 *offset, 4585 dst, 4586 sh, &inp, netp, vrf_id); 4587 if (stcb != NULL) 4588 break; 4589 asconf_offset += SCTP_SIZE32(asconf_len); 4590 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4591 sizeof(struct sctp_chunkhdr), chunk_buf); 4592 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4593 if (stcb == NULL) { 4594 /* 4595 * reduce inp's refcount if not reduced in 4596 * sctp_findassociation_ep_asconf(). 4597 */ 4598 SCTP_INP_DECR_REF(inp); 4599 } else { 4600 locked_tcb = stcb; 4601 } 4602 4603 /* now go back and verify any auth chunk to be sure */ 4604 if (auth_skipped && (stcb != NULL)) { 4605 struct sctp_auth_chunk *auth; 4606 4607 auth = (struct sctp_auth_chunk *) 4608 sctp_m_getptr(m, auth_offset, 4609 auth_len, chunk_buf); 4610 got_auth = 1; 4611 auth_skipped = 0; 4612 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4613 auth_offset)) { 4614 /* auth HMAC failed so dump it */ 4615 *offset = length; 4616 if (locked_tcb) { 4617 SCTP_TCB_UNLOCK(locked_tcb); 4618 } 4619 return (NULL); 4620 } else { 4621 /* remaining chunks are HMAC checked */ 4622 stcb->asoc.authenticated = 1; 4623 } 4624 } 4625 } 4626 if (stcb == NULL) { 4627 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 4628 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4629 msg); 4630 /* no association, so it's out of the blue... */ 4631 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4632 mflowtype, mflowid, inp->fibnum, 4633 vrf_id, port); 4634 *offset = length; 4635 if (locked_tcb) { 4636 SCTP_TCB_UNLOCK(locked_tcb); 4637 } 4638 return (NULL); 4639 } 4640 asoc = &stcb->asoc; 4641 /* ABORT and SHUTDOWN can use either v_tag... */ 4642 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4643 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4644 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4645 /* Take the T-bit always into account. */ 4646 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4647 (vtag_in == asoc->my_vtag)) || 4648 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4649 (vtag_in == asoc->peer_vtag))) { 4650 /* this is valid */ 4651 } else { 4652 /* drop this packet... */ 4653 SCTP_STAT_INCR(sctps_badvtag); 4654 if (locked_tcb) { 4655 SCTP_TCB_UNLOCK(locked_tcb); 4656 } 4657 return (NULL); 4658 } 4659 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4660 if (vtag_in != asoc->my_vtag) { 4661 /* 4662 * this could be a stale SHUTDOWN-ACK or the 4663 * peer never got the SHUTDOWN-COMPLETE and 4664 * is still hung; we have started a new asoc 4665 * but it won't complete until the shutdown 4666 * is completed 4667 */ 4668 if (locked_tcb) { 4669 SCTP_TCB_UNLOCK(locked_tcb); 4670 } 4671 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 4672 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4673 msg); 4674 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4675 sh, inp, op_err, 4676 mflowtype, mflowid, fibnum, 4677 vrf_id, port); 4678 return (NULL); 4679 } 4680 } else { 4681 /* for all other chunks, vtag must match */ 4682 if (vtag_in != asoc->my_vtag) { 4683 /* invalid vtag... */ 4684 SCTPDBG(SCTP_DEBUG_INPUT3, 4685 "invalid vtag: %xh, expect %xh\n", 4686 vtag_in, asoc->my_vtag); 4687 SCTP_STAT_INCR(sctps_badvtag); 4688 if (locked_tcb) { 4689 SCTP_TCB_UNLOCK(locked_tcb); 4690 } 4691 *offset = length; 4692 return (NULL); 4693 } 4694 } 4695 } /* end if !SCTP_COOKIE_ECHO */ 4696 /* 4697 * process all control chunks... 4698 */ 4699 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4700 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4701 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4702 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4703 /* implied cookie-ack.. we must have lost the ack */ 4704 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4705 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4706 stcb->asoc.overall_error_count, 4707 0, 4708 SCTP_FROM_SCTP_INPUT, 4709 __LINE__); 4710 } 4711 stcb->asoc.overall_error_count = 0; 4712 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4713 *netp); 4714 } 4715 process_control_chunks: 4716 while (IS_SCTP_CONTROL(ch)) { 4717 /* validate chunk length */ 4718 chk_length = ntohs(ch->chunk_length); 4719 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4720 ch->chunk_type, chk_length); 4721 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4722 if (chk_length < sizeof(*ch) || 4723 (*offset + (int)chk_length) > length) { 4724 *offset = length; 4725 if (locked_tcb) { 4726 SCTP_TCB_UNLOCK(locked_tcb); 4727 } 4728 return (NULL); 4729 } 4730 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4731 /* 4732 * INIT-ACK only gets the init ack "header" portion only 4733 * because we don't have to process the peer's COOKIE. All 4734 * others get a complete chunk. 4735 */ 4736 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4737 (ch->chunk_type == SCTP_INITIATION)) { 4738 /* get an init-ack chunk */ 4739 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4740 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4741 if (ch == NULL) { 4742 *offset = length; 4743 if (locked_tcb) { 4744 SCTP_TCB_UNLOCK(locked_tcb); 4745 } 4746 return (NULL); 4747 } 4748 } else { 4749 /* For cookies and all other chunks. */ 4750 if (chk_length > sizeof(chunk_buf)) { 4751 /* 4752 * use just the size of the chunk buffer so 4753 * the front part of our chunks fit in 4754 * contiguous space up to the chunk buffer 4755 * size (508 bytes). For chunks that need to 4756 * get more than that they must use the 4757 * sctp_m_getptr() function or other means 4758 * (e.g. know how to parse mbuf chains). 4759 * Cookies do this already. 4760 */ 4761 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4762 (sizeof(chunk_buf) - 4), 4763 chunk_buf); 4764 if (ch == NULL) { 4765 *offset = length; 4766 if (locked_tcb) { 4767 SCTP_TCB_UNLOCK(locked_tcb); 4768 } 4769 return (NULL); 4770 } 4771 } else { 4772 /* We can fit it all */ 4773 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4774 chk_length, chunk_buf); 4775 if (ch == NULL) { 4776 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4777 *offset = length; 4778 if (locked_tcb) { 4779 SCTP_TCB_UNLOCK(locked_tcb); 4780 } 4781 return (NULL); 4782 } 4783 } 4784 } 4785 num_chunks++; 4786 /* Save off the last place we got a control from */ 4787 if (stcb != NULL) { 4788 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4789 /* 4790 * allow last_control to be NULL if 4791 * ASCONF... ASCONF processing will find the 4792 * right net later 4793 */ 4794 if ((netp != NULL) && (*netp != NULL)) 4795 stcb->asoc.last_control_chunk_from = *netp; 4796 } 4797 } 4798 #ifdef SCTP_AUDITING_ENABLED 4799 sctp_audit_log(0xB0, ch->chunk_type); 4800 #endif 4801 4802 /* check to see if this chunk required auth, but isn't */ 4803 if ((stcb != NULL) && 4804 (stcb->asoc.auth_supported == 1) && 4805 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4806 !stcb->asoc.authenticated) { 4807 /* "silently" ignore */ 4808 SCTP_STAT_INCR(sctps_recvauthmissing); 4809 goto next_chunk; 4810 } 4811 switch (ch->chunk_type) { 4812 case SCTP_INITIATION: 4813 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4814 /* The INIT chunk must be the only chunk. */ 4815 if ((num_chunks > 1) || 4816 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4817 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4818 "INIT not the only chunk"); 4819 sctp_abort_association(inp, stcb, m, iphlen, 4820 src, dst, sh, op_err, 4821 mflowtype, mflowid, 4822 vrf_id, port); 4823 *offset = length; 4824 return (NULL); 4825 } 4826 /* Honor our resource limit. */ 4827 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4828 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4829 sctp_abort_association(inp, stcb, m, iphlen, 4830 src, dst, sh, op_err, 4831 mflowtype, mflowid, 4832 vrf_id, port); 4833 *offset = length; 4834 return (NULL); 4835 } 4836 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4837 (struct sctp_init_chunk *)ch, inp, 4838 stcb, &abort_no_unlock, 4839 mflowtype, mflowid, 4840 vrf_id, port); 4841 *offset = length; 4842 if ((!abort_no_unlock) && (locked_tcb)) { 4843 SCTP_TCB_UNLOCK(locked_tcb); 4844 } 4845 return (NULL); 4846 break; 4847 case SCTP_PAD_CHUNK: 4848 break; 4849 case SCTP_INITIATION_ACK: 4850 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4851 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4852 /* We are not interested anymore */ 4853 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4854 ; 4855 } else { 4856 if (locked_tcb != stcb) { 4857 /* Very unlikely */ 4858 SCTP_TCB_UNLOCK(locked_tcb); 4859 } 4860 *offset = length; 4861 if (stcb) { 4862 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4863 so = SCTP_INP_SO(inp); 4864 atomic_add_int(&stcb->asoc.refcnt, 1); 4865 SCTP_TCB_UNLOCK(stcb); 4866 SCTP_SOCKET_LOCK(so, 1); 4867 SCTP_TCB_LOCK(stcb); 4868 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4869 #endif 4870 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4871 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4872 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4873 SCTP_SOCKET_UNLOCK(so, 1); 4874 #endif 4875 } 4876 return (NULL); 4877 } 4878 } 4879 /* The INIT-ACK chunk must be the only chunk. */ 4880 if ((num_chunks > 1) || 4881 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4882 *offset = length; 4883 if (locked_tcb) { 4884 SCTP_TCB_UNLOCK(locked_tcb); 4885 } 4886 return (NULL); 4887 } 4888 if ((netp) && (*netp)) { 4889 ret = sctp_handle_init_ack(m, iphlen, *offset, 4890 src, dst, sh, 4891 (struct sctp_init_ack_chunk *)ch, 4892 stcb, *netp, 4893 &abort_no_unlock, 4894 mflowtype, mflowid, 4895 vrf_id); 4896 } else { 4897 ret = -1; 4898 } 4899 *offset = length; 4900 if (abort_no_unlock) { 4901 return (NULL); 4902 } 4903 /* 4904 * Special case, I must call the output routine to 4905 * get the cookie echoed 4906 */ 4907 if ((stcb != NULL) && (ret == 0)) { 4908 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4909 } 4910 if (locked_tcb) { 4911 SCTP_TCB_UNLOCK(locked_tcb); 4912 } 4913 return (NULL); 4914 break; 4915 case SCTP_SELECTIVE_ACK: 4916 { 4917 struct sctp_sack_chunk *sack; 4918 int abort_now = 0; 4919 uint32_t a_rwnd, cum_ack; 4920 uint16_t num_seg, num_dup; 4921 uint8_t flags; 4922 int offset_seg, offset_dup; 4923 4924 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4925 SCTP_STAT_INCR(sctps_recvsacks); 4926 if (stcb == NULL) { 4927 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4928 break; 4929 } 4930 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4931 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4932 break; 4933 } 4934 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4935 /*- 4936 * If we have sent a shutdown-ack, we will pay no 4937 * attention to a sack sent in to us since 4938 * we don't care anymore. 4939 */ 4940 break; 4941 } 4942 sack = (struct sctp_sack_chunk *)ch; 4943 flags = ch->chunk_flags; 4944 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4945 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4946 num_dup = ntohs(sack->sack.num_dup_tsns); 4947 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4948 if (sizeof(struct sctp_sack_chunk) + 4949 num_seg * sizeof(struct sctp_gap_ack_block) + 4950 num_dup * sizeof(uint32_t) != chk_length) { 4951 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4952 break; 4953 } 4954 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4955 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4956 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4957 cum_ack, num_seg, a_rwnd); 4958 stcb->asoc.seen_a_sack_this_pkt = 1; 4959 if ((stcb->asoc.pr_sctp_cnt == 0) && 4960 (num_seg == 0) && 4961 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4962 (stcb->asoc.saw_sack_with_frags == 0) && 4963 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4964 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4965 ) { 4966 /* 4967 * We have a SIMPLE sack having no 4968 * prior segments and data on sent 4969 * queue to be acked.. Use the 4970 * faster path sack processing. We 4971 * also allow window update sacks 4972 * with no missing segments to go 4973 * this way too. 4974 */ 4975 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4976 } else { 4977 if (netp && *netp) 4978 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4979 num_seg, 0, num_dup, &abort_now, flags, 4980 cum_ack, a_rwnd, ecne_seen); 4981 } 4982 if (abort_now) { 4983 /* ABORT signal from sack processing */ 4984 *offset = length; 4985 return (NULL); 4986 } 4987 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4988 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4989 (stcb->asoc.stream_queue_cnt == 0)) { 4990 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4991 } 4992 } 4993 break; 4994 /* 4995 * EY - nr_sack: If the received chunk is an 4996 * nr_sack chunk 4997 */ 4998 case SCTP_NR_SELECTIVE_ACK: 4999 { 5000 struct sctp_nr_sack_chunk *nr_sack; 5001 int abort_now = 0; 5002 uint32_t a_rwnd, cum_ack; 5003 uint16_t num_seg, num_nr_seg, num_dup; 5004 uint8_t flags; 5005 int offset_seg, offset_dup; 5006 5007 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5008 SCTP_STAT_INCR(sctps_recvsacks); 5009 if (stcb == NULL) { 5010 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5011 break; 5012 } 5013 if (stcb->asoc.nrsack_supported == 0) { 5014 goto unknown_chunk; 5015 } 5016 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5017 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5018 break; 5019 } 5020 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5021 /*- 5022 * If we have sent a shutdown-ack, we will pay no 5023 * attention to a sack sent in to us since 5024 * we don't care anymore. 5025 */ 5026 break; 5027 } 5028 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5029 flags = ch->chunk_flags; 5030 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5031 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5032 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5033 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5034 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5035 if (sizeof(struct sctp_nr_sack_chunk) + 5036 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5037 num_dup * sizeof(uint32_t) != chk_length) { 5038 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5039 break; 5040 } 5041 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5042 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5043 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5044 cum_ack, num_seg, a_rwnd); 5045 stcb->asoc.seen_a_sack_this_pkt = 1; 5046 if ((stcb->asoc.pr_sctp_cnt == 0) && 5047 (num_seg == 0) && (num_nr_seg == 0) && 5048 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5049 (stcb->asoc.saw_sack_with_frags == 0) && 5050 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5051 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5052 /* 5053 * We have a SIMPLE sack having no 5054 * prior segments and data on sent 5055 * queue to be acked. Use the faster 5056 * path sack processing. We also 5057 * allow window update sacks with no 5058 * missing segments to go this way 5059 * too. 5060 */ 5061 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5062 &abort_now, ecne_seen); 5063 } else { 5064 if (netp && *netp) 5065 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5066 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5067 cum_ack, a_rwnd, ecne_seen); 5068 } 5069 if (abort_now) { 5070 /* ABORT signal from sack processing */ 5071 *offset = length; 5072 return (NULL); 5073 } 5074 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5075 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5076 (stcb->asoc.stream_queue_cnt == 0)) { 5077 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5078 } 5079 } 5080 break; 5081 5082 case SCTP_HEARTBEAT_REQUEST: 5083 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5084 if ((stcb) && netp && *netp) { 5085 SCTP_STAT_INCR(sctps_recvheartbeat); 5086 sctp_send_heartbeat_ack(stcb, m, *offset, 5087 chk_length, *netp); 5088 5089 /* He's alive so give him credit */ 5090 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5091 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5092 stcb->asoc.overall_error_count, 5093 0, 5094 SCTP_FROM_SCTP_INPUT, 5095 __LINE__); 5096 } 5097 stcb->asoc.overall_error_count = 0; 5098 } 5099 break; 5100 case SCTP_HEARTBEAT_ACK: 5101 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5102 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5103 /* Its not ours */ 5104 *offset = length; 5105 if (locked_tcb) { 5106 SCTP_TCB_UNLOCK(locked_tcb); 5107 } 5108 return (NULL); 5109 } 5110 /* He's alive so give him credit */ 5111 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5112 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5113 stcb->asoc.overall_error_count, 5114 0, 5115 SCTP_FROM_SCTP_INPUT, 5116 __LINE__); 5117 } 5118 stcb->asoc.overall_error_count = 0; 5119 SCTP_STAT_INCR(sctps_recvheartbeatack); 5120 if (netp && *netp) 5121 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5122 stcb, *netp); 5123 break; 5124 case SCTP_ABORT_ASSOCIATION: 5125 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5126 (void *)stcb); 5127 if ((stcb) && netp && *netp) 5128 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5129 stcb, *netp); 5130 *offset = length; 5131 return (NULL); 5132 break; 5133 case SCTP_SHUTDOWN: 5134 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5135 (void *)stcb); 5136 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5137 *offset = length; 5138 if (locked_tcb) { 5139 SCTP_TCB_UNLOCK(locked_tcb); 5140 } 5141 return (NULL); 5142 } 5143 if (netp && *netp) { 5144 int abort_flag = 0; 5145 5146 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5147 stcb, *netp, &abort_flag); 5148 if (abort_flag) { 5149 *offset = length; 5150 return (NULL); 5151 } 5152 } 5153 break; 5154 case SCTP_SHUTDOWN_ACK: 5155 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5156 if ((stcb) && (netp) && (*netp)) 5157 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5158 *offset = length; 5159 return (NULL); 5160 break; 5161 5162 case SCTP_OPERATION_ERROR: 5163 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5164 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5165 *offset = length; 5166 return (NULL); 5167 } 5168 break; 5169 case SCTP_COOKIE_ECHO: 5170 SCTPDBG(SCTP_DEBUG_INPUT3, 5171 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5172 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5173 ; 5174 } else { 5175 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5176 /* We are not interested anymore */ 5177 abend: 5178 if (stcb) { 5179 SCTP_TCB_UNLOCK(stcb); 5180 } 5181 *offset = length; 5182 return (NULL); 5183 } 5184 } 5185 /* 5186 * First are we accepting? We do this again here 5187 * since it is possible that a previous endpoint WAS 5188 * listening responded to a INIT-ACK and then 5189 * closed. We opened and bound.. and are now no 5190 * longer listening. 5191 */ 5192 5193 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5194 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5195 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5196 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5197 sctp_abort_association(inp, stcb, m, iphlen, 5198 src, dst, sh, op_err, 5199 mflowtype, mflowid, 5200 vrf_id, port); 5201 } 5202 *offset = length; 5203 return (NULL); 5204 } else { 5205 struct mbuf *ret_buf; 5206 struct sctp_inpcb *linp; 5207 5208 if (stcb) { 5209 linp = NULL; 5210 } else { 5211 linp = inp; 5212 } 5213 5214 if (linp) { 5215 SCTP_ASOC_CREATE_LOCK(linp); 5216 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5217 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5218 SCTP_ASOC_CREATE_UNLOCK(linp); 5219 goto abend; 5220 } 5221 } 5222 if (netp) { 5223 ret_buf = 5224 sctp_handle_cookie_echo(m, iphlen, 5225 *offset, 5226 src, dst, 5227 sh, 5228 (struct sctp_cookie_echo_chunk *)ch, 5229 &inp, &stcb, netp, 5230 auth_skipped, 5231 auth_offset, 5232 auth_len, 5233 &locked_tcb, 5234 mflowtype, 5235 mflowid, 5236 vrf_id, 5237 port); 5238 } else { 5239 ret_buf = NULL; 5240 } 5241 if (linp) { 5242 SCTP_ASOC_CREATE_UNLOCK(linp); 5243 } 5244 if (ret_buf == NULL) { 5245 if (locked_tcb) { 5246 SCTP_TCB_UNLOCK(locked_tcb); 5247 } 5248 SCTPDBG(SCTP_DEBUG_INPUT3, 5249 "GAK, null buffer\n"); 5250 *offset = length; 5251 return (NULL); 5252 } 5253 /* if AUTH skipped, see if it verified... */ 5254 if (auth_skipped) { 5255 got_auth = 1; 5256 auth_skipped = 0; 5257 } 5258 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5259 /* 5260 * Restart the timer if we have 5261 * pending data 5262 */ 5263 struct sctp_tmit_chunk *chk; 5264 5265 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5266 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5267 } 5268 } 5269 break; 5270 case SCTP_COOKIE_ACK: 5271 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5272 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5273 if (locked_tcb) { 5274 SCTP_TCB_UNLOCK(locked_tcb); 5275 } 5276 return (NULL); 5277 } 5278 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5279 /* We are not interested anymore */ 5280 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5281 ; 5282 } else if (stcb) { 5283 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5284 so = SCTP_INP_SO(inp); 5285 atomic_add_int(&stcb->asoc.refcnt, 1); 5286 SCTP_TCB_UNLOCK(stcb); 5287 SCTP_SOCKET_LOCK(so, 1); 5288 SCTP_TCB_LOCK(stcb); 5289 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5290 #endif 5291 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5292 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5293 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5294 SCTP_SOCKET_UNLOCK(so, 1); 5295 #endif 5296 *offset = length; 5297 return (NULL); 5298 } 5299 } 5300 /* He's alive so give him credit */ 5301 if ((stcb) && netp && *netp) { 5302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5303 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5304 stcb->asoc.overall_error_count, 5305 0, 5306 SCTP_FROM_SCTP_INPUT, 5307 __LINE__); 5308 } 5309 stcb->asoc.overall_error_count = 0; 5310 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5311 } 5312 break; 5313 case SCTP_ECN_ECHO: 5314 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5315 /* He's alive so give him credit */ 5316 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5317 /* Its not ours */ 5318 if (locked_tcb) { 5319 SCTP_TCB_UNLOCK(locked_tcb); 5320 } 5321 *offset = length; 5322 return (NULL); 5323 } 5324 if (stcb) { 5325 if (stcb->asoc.ecn_supported == 0) { 5326 goto unknown_chunk; 5327 } 5328 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5329 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5330 stcb->asoc.overall_error_count, 5331 0, 5332 SCTP_FROM_SCTP_INPUT, 5333 __LINE__); 5334 } 5335 stcb->asoc.overall_error_count = 0; 5336 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5337 stcb); 5338 ecne_seen = 1; 5339 } 5340 break; 5341 case SCTP_ECN_CWR: 5342 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5343 /* He's alive so give him credit */ 5344 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5345 /* Its not ours */ 5346 if (locked_tcb) { 5347 SCTP_TCB_UNLOCK(locked_tcb); 5348 } 5349 *offset = length; 5350 return (NULL); 5351 } 5352 if (stcb) { 5353 if (stcb->asoc.ecn_supported == 0) { 5354 goto unknown_chunk; 5355 } 5356 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5357 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5358 stcb->asoc.overall_error_count, 5359 0, 5360 SCTP_FROM_SCTP_INPUT, 5361 __LINE__); 5362 } 5363 stcb->asoc.overall_error_count = 0; 5364 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5365 } 5366 break; 5367 case SCTP_SHUTDOWN_COMPLETE: 5368 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5369 /* must be first and only chunk */ 5370 if ((num_chunks > 1) || 5371 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5372 *offset = length; 5373 if (locked_tcb) { 5374 SCTP_TCB_UNLOCK(locked_tcb); 5375 } 5376 return (NULL); 5377 } 5378 if ((stcb) && netp && *netp) { 5379 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5380 stcb, *netp); 5381 } 5382 *offset = length; 5383 return (NULL); 5384 break; 5385 case SCTP_ASCONF: 5386 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5387 /* He's alive so give him credit */ 5388 if (stcb) { 5389 if (stcb->asoc.asconf_supported == 0) { 5390 goto unknown_chunk; 5391 } 5392 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5393 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5394 stcb->asoc.overall_error_count, 5395 0, 5396 SCTP_FROM_SCTP_INPUT, 5397 __LINE__); 5398 } 5399 stcb->asoc.overall_error_count = 0; 5400 sctp_handle_asconf(m, *offset, src, 5401 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5402 asconf_cnt++; 5403 } 5404 break; 5405 case SCTP_ASCONF_ACK: 5406 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5407 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5408 /* Its not ours */ 5409 if (locked_tcb) { 5410 SCTP_TCB_UNLOCK(locked_tcb); 5411 } 5412 *offset = length; 5413 return (NULL); 5414 } 5415 if ((stcb) && netp && *netp) { 5416 if (stcb->asoc.asconf_supported == 0) { 5417 goto unknown_chunk; 5418 } 5419 /* He's alive so give him credit */ 5420 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5421 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5422 stcb->asoc.overall_error_count, 5423 0, 5424 SCTP_FROM_SCTP_INPUT, 5425 __LINE__); 5426 } 5427 stcb->asoc.overall_error_count = 0; 5428 sctp_handle_asconf_ack(m, *offset, 5429 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5430 if (abort_no_unlock) 5431 return (NULL); 5432 } 5433 break; 5434 case SCTP_FORWARD_CUM_TSN: 5435 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5436 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5437 /* Its not ours */ 5438 if (locked_tcb) { 5439 SCTP_TCB_UNLOCK(locked_tcb); 5440 } 5441 *offset = length; 5442 return (NULL); 5443 } 5444 /* He's alive so give him credit */ 5445 if (stcb) { 5446 int abort_flag = 0; 5447 5448 if (stcb->asoc.prsctp_supported == 0) { 5449 goto unknown_chunk; 5450 } 5451 stcb->asoc.overall_error_count = 0; 5452 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5453 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5454 stcb->asoc.overall_error_count, 5455 0, 5456 SCTP_FROM_SCTP_INPUT, 5457 __LINE__); 5458 } 5459 *fwd_tsn_seen = 1; 5460 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5461 /* We are not interested anymore */ 5462 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5463 so = SCTP_INP_SO(inp); 5464 atomic_add_int(&stcb->asoc.refcnt, 1); 5465 SCTP_TCB_UNLOCK(stcb); 5466 SCTP_SOCKET_LOCK(so, 1); 5467 SCTP_TCB_LOCK(stcb); 5468 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5469 #endif 5470 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5471 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5472 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5473 SCTP_SOCKET_UNLOCK(so, 1); 5474 #endif 5475 *offset = length; 5476 return (NULL); 5477 } 5478 sctp_handle_forward_tsn(stcb, 5479 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5480 if (abort_flag) { 5481 *offset = length; 5482 return (NULL); 5483 } else { 5484 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5485 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5486 stcb->asoc.overall_error_count, 5487 0, 5488 SCTP_FROM_SCTP_INPUT, 5489 __LINE__); 5490 } 5491 stcb->asoc.overall_error_count = 0; 5492 } 5493 5494 } 5495 break; 5496 case SCTP_STREAM_RESET: 5497 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5498 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5499 /* Its not ours */ 5500 if (locked_tcb) { 5501 SCTP_TCB_UNLOCK(locked_tcb); 5502 } 5503 *offset = length; 5504 return (NULL); 5505 } 5506 if (stcb->asoc.reconfig_supported == 0) { 5507 goto unknown_chunk; 5508 } 5509 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5510 /* stop processing */ 5511 *offset = length; 5512 return (NULL); 5513 } 5514 break; 5515 case SCTP_PACKET_DROPPED: 5516 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5517 /* re-get it all please */ 5518 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5519 /* Its not ours */ 5520 if (locked_tcb) { 5521 SCTP_TCB_UNLOCK(locked_tcb); 5522 } 5523 *offset = length; 5524 return (NULL); 5525 } 5526 if (ch && (stcb) && netp && (*netp)) { 5527 if (stcb->asoc.pktdrop_supported == 0) { 5528 goto unknown_chunk; 5529 } 5530 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5531 stcb, *netp, 5532 min(chk_length, (sizeof(chunk_buf) - 4))); 5533 5534 } 5535 break; 5536 case SCTP_AUTHENTICATION: 5537 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5538 if (stcb == NULL) { 5539 /* save the first AUTH for later processing */ 5540 if (auth_skipped == 0) { 5541 auth_offset = *offset; 5542 auth_len = chk_length; 5543 auth_skipped = 1; 5544 } 5545 /* skip this chunk (temporarily) */ 5546 goto next_chunk; 5547 } 5548 if (stcb->asoc.auth_supported == 0) { 5549 goto unknown_chunk; 5550 } 5551 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5552 (chk_length > (sizeof(struct sctp_auth_chunk) + 5553 SCTP_AUTH_DIGEST_LEN_MAX))) { 5554 /* Its not ours */ 5555 if (locked_tcb) { 5556 SCTP_TCB_UNLOCK(locked_tcb); 5557 } 5558 *offset = length; 5559 return (NULL); 5560 } 5561 if (got_auth == 1) { 5562 /* skip this chunk... it's already auth'd */ 5563 goto next_chunk; 5564 } 5565 got_auth = 1; 5566 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5567 m, *offset)) { 5568 /* auth HMAC failed so dump the packet */ 5569 *offset = length; 5570 return (stcb); 5571 } else { 5572 /* remaining chunks are HMAC checked */ 5573 stcb->asoc.authenticated = 1; 5574 } 5575 break; 5576 5577 default: 5578 unknown_chunk: 5579 /* it's an unknown chunk! */ 5580 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5581 struct mbuf *mm; 5582 struct sctp_paramhdr *phd; 5583 int len; 5584 5585 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5586 0, M_NOWAIT, 1, MT_DATA); 5587 if (mm) { 5588 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5589 phd = mtod(mm, struct sctp_paramhdr *); 5590 /* 5591 * We cheat and use param type since 5592 * we did not bother to define a 5593 * error cause struct. They are the 5594 * same basic format with different 5595 * names. 5596 */ 5597 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5598 phd->param_length = htons(len + sizeof(*phd)); 5599 SCTP_BUF_LEN(mm) = sizeof(*phd); 5600 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5601 if (SCTP_BUF_NEXT(mm)) { 5602 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5603 sctp_m_freem(mm); 5604 } else { 5605 #ifdef SCTP_MBUF_LOGGING 5606 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5607 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5608 } 5609 #endif 5610 sctp_queue_op_err(stcb, mm); 5611 } 5612 } else { 5613 sctp_m_freem(mm); 5614 } 5615 } 5616 } 5617 if ((ch->chunk_type & 0x80) == 0) { 5618 /* discard this packet */ 5619 *offset = length; 5620 return (stcb); 5621 } /* else skip this bad chunk and continue... */ 5622 break; 5623 } /* switch (ch->chunk_type) */ 5624 5625 5626 next_chunk: 5627 /* get the next chunk */ 5628 *offset += SCTP_SIZE32(chk_length); 5629 if (*offset >= length) { 5630 /* no more data left in the mbuf chain */ 5631 break; 5632 } 5633 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5634 sizeof(struct sctp_chunkhdr), chunk_buf); 5635 if (ch == NULL) { 5636 if (locked_tcb) { 5637 SCTP_TCB_UNLOCK(locked_tcb); 5638 } 5639 *offset = length; 5640 return (NULL); 5641 } 5642 } /* while */ 5643 5644 if (asconf_cnt > 0 && stcb != NULL) { 5645 sctp_send_asconf_ack(stcb); 5646 } 5647 return (stcb); 5648 } 5649 5650 5651 #ifdef INVARIANTS 5652 #ifdef __GNUC__ 5653 __attribute__((noinline)) 5654 #endif 5655 void 5656 sctp_validate_no_locks(struct sctp_inpcb *inp) 5657 { 5658 struct sctp_tcb *lstcb; 5659 5660 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5661 if (mtx_owned(&lstcb->tcb_mtx)) { 5662 panic("Own lock on stcb at return from input"); 5663 } 5664 } 5665 if (mtx_owned(&inp->inp_create_mtx)) { 5666 panic("Own create lock on inp"); 5667 } 5668 if (mtx_owned(&inp->inp_mtx)) { 5669 panic("Own inp lock on inp"); 5670 } 5671 } 5672 5673 #endif 5674 5675 /* 5676 * common input chunk processing (v4 and v6) 5677 */ 5678 void 5679 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5680 struct sockaddr *src, struct sockaddr *dst, 5681 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5682 #if !defined(SCTP_WITH_NO_CSUM) 5683 uint8_t compute_crc, 5684 #endif 5685 uint8_t ecn_bits, 5686 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5687 uint32_t vrf_id, uint16_t port) 5688 { 5689 uint32_t high_tsn; 5690 int fwd_tsn_seen = 0, data_processed = 0; 5691 struct mbuf *m = *mm, *op_err; 5692 char msg[SCTP_DIAG_INFO_LEN]; 5693 int un_sent; 5694 int cnt_ctrl_ready = 0; 5695 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5696 struct sctp_tcb *stcb = NULL; 5697 struct sctp_nets *net = NULL; 5698 5699 SCTP_STAT_INCR(sctps_recvdatagrams); 5700 #ifdef SCTP_AUDITING_ENABLED 5701 sctp_audit_log(0xE0, 1); 5702 sctp_auditing(0, inp, stcb, net); 5703 #endif 5704 #if !defined(SCTP_WITH_NO_CSUM) 5705 if (compute_crc != 0) { 5706 uint32_t check, calc_check; 5707 5708 check = sh->checksum; 5709 sh->checksum = 0; 5710 calc_check = sctp_calculate_cksum(m, iphlen); 5711 sh->checksum = check; 5712 if (calc_check != check) { 5713 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5714 calc_check, check, (void *)m, length, iphlen); 5715 stcb = sctp_findassociation_addr(m, offset, src, dst, 5716 sh, ch, &inp, &net, vrf_id); 5717 #if defined(INET) || defined(INET6) 5718 if ((net != NULL) && (port != 0)) { 5719 if (net->port == 0) { 5720 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5721 } 5722 net->port = port; 5723 } 5724 #endif 5725 if (net != NULL) { 5726 net->flowtype = mflowtype; 5727 net->flowid = mflowid; 5728 } 5729 if ((inp != NULL) && (stcb != NULL)) { 5730 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5731 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5732 } else if ((inp != NULL) && (stcb == NULL)) { 5733 inp_decr = inp; 5734 } 5735 SCTP_STAT_INCR(sctps_badsum); 5736 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5737 goto out; 5738 } 5739 } 5740 #endif 5741 /* Destination port of 0 is illegal, based on RFC4960. */ 5742 if (sh->dest_port == 0) { 5743 SCTP_STAT_INCR(sctps_hdrops); 5744 goto out; 5745 } 5746 stcb = sctp_findassociation_addr(m, offset, src, dst, 5747 sh, ch, &inp, &net, vrf_id); 5748 #if defined(INET) || defined(INET6) 5749 if ((net != NULL) && (port != 0)) { 5750 if (net->port == 0) { 5751 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5752 } 5753 net->port = port; 5754 } 5755 #endif 5756 if (net != NULL) { 5757 net->flowtype = mflowtype; 5758 net->flowid = mflowid; 5759 } 5760 if (inp == NULL) { 5761 SCTP_STAT_INCR(sctps_noport); 5762 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5763 goto out; 5764 } 5765 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5766 sctp_send_shutdown_complete2(src, dst, sh, 5767 mflowtype, mflowid, fibnum, 5768 vrf_id, port); 5769 goto out; 5770 } 5771 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5772 goto out; 5773 } 5774 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5775 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5776 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5777 (ch->chunk_type != SCTP_INIT))) { 5778 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5779 "Out of the blue"); 5780 sctp_send_abort(m, iphlen, src, dst, 5781 sh, 0, op_err, 5782 mflowtype, mflowid, fibnum, 5783 vrf_id, port); 5784 } 5785 } 5786 goto out; 5787 } else if (stcb == NULL) { 5788 inp_decr = inp; 5789 } 5790 #ifdef IPSEC 5791 /*- 5792 * I very much doubt any of the IPSEC stuff will work but I have no 5793 * idea, so I will leave it in place. 5794 */ 5795 if (inp != NULL) { 5796 switch (dst->sa_family) { 5797 #ifdef INET 5798 case AF_INET: 5799 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5800 SCTP_STAT_INCR(sctps_hdrops); 5801 goto out; 5802 } 5803 break; 5804 #endif 5805 #ifdef INET6 5806 case AF_INET6: 5807 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5808 SCTP_STAT_INCR(sctps_hdrops); 5809 goto out; 5810 } 5811 break; 5812 #endif 5813 default: 5814 break; 5815 } 5816 } 5817 #endif 5818 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5819 (void *)m, iphlen, offset, length, (void *)stcb); 5820 if (stcb) { 5821 /* always clear this before beginning a packet */ 5822 stcb->asoc.authenticated = 0; 5823 stcb->asoc.seen_a_sack_this_pkt = 0; 5824 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5825 (void *)stcb, stcb->asoc.state); 5826 5827 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5828 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5829 /*- 5830 * If we hit here, we had a ref count 5831 * up when the assoc was aborted and the 5832 * timer is clearing out the assoc, we should 5833 * NOT respond to any packet.. its OOTB. 5834 */ 5835 SCTP_TCB_UNLOCK(stcb); 5836 stcb = NULL; 5837 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5838 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5839 msg); 5840 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5841 mflowtype, mflowid, inp->fibnum, 5842 vrf_id, port); 5843 goto out; 5844 } 5845 } 5846 if (IS_SCTP_CONTROL(ch)) { 5847 /* process the control portion of the SCTP packet */ 5848 /* sa_ignore NO_NULL_CHK */ 5849 stcb = sctp_process_control(m, iphlen, &offset, length, 5850 src, dst, sh, ch, 5851 inp, stcb, &net, &fwd_tsn_seen, 5852 mflowtype, mflowid, fibnum, 5853 vrf_id, port); 5854 if (stcb) { 5855 /* 5856 * This covers us if the cookie-echo was there and 5857 * it changes our INP. 5858 */ 5859 inp = stcb->sctp_ep; 5860 #if defined(INET) || defined(INET6) 5861 if ((net) && (port)) { 5862 if (net->port == 0) { 5863 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5864 } 5865 net->port = port; 5866 } 5867 #endif 5868 } 5869 } else { 5870 /* 5871 * no control chunks, so pre-process DATA chunks (these 5872 * checks are taken care of by control processing) 5873 */ 5874 5875 /* 5876 * if DATA only packet, and auth is required, then punt... 5877 * can't have authenticated without any AUTH (control) 5878 * chunks 5879 */ 5880 if ((stcb != NULL) && 5881 (stcb->asoc.auth_supported == 1) && 5882 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5883 /* "silently" ignore */ 5884 SCTP_STAT_INCR(sctps_recvauthmissing); 5885 goto out; 5886 } 5887 if (stcb == NULL) { 5888 /* out of the blue DATA chunk */ 5889 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5890 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5891 msg); 5892 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5893 mflowtype, mflowid, fibnum, 5894 vrf_id, port); 5895 goto out; 5896 } 5897 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5898 /* v_tag mismatch! */ 5899 SCTP_STAT_INCR(sctps_badvtag); 5900 goto out; 5901 } 5902 } 5903 5904 if (stcb == NULL) { 5905 /* 5906 * no valid TCB for this packet, or we found it's a bad 5907 * packet while processing control, or we're done with this 5908 * packet (done or skip rest of data), so we drop it... 5909 */ 5910 goto out; 5911 } 5912 /* 5913 * DATA chunk processing 5914 */ 5915 /* plow through the data chunks while length > offset */ 5916 5917 /* 5918 * Rest should be DATA only. Check authentication state if AUTH for 5919 * DATA is required. 5920 */ 5921 if ((length > offset) && 5922 (stcb != NULL) && 5923 (stcb->asoc.auth_supported == 1) && 5924 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5925 !stcb->asoc.authenticated) { 5926 /* "silently" ignore */ 5927 SCTP_STAT_INCR(sctps_recvauthmissing); 5928 SCTPDBG(SCTP_DEBUG_AUTH1, 5929 "Data chunk requires AUTH, skipped\n"); 5930 goto trigger_send; 5931 } 5932 if (length > offset) { 5933 int retval; 5934 5935 /* 5936 * First check to make sure our state is correct. We would 5937 * not get here unless we really did have a tag, so we don't 5938 * abort if this happens, just dump the chunk silently. 5939 */ 5940 switch (SCTP_GET_STATE(&stcb->asoc)) { 5941 case SCTP_STATE_COOKIE_ECHOED: 5942 /* 5943 * we consider data with valid tags in this state 5944 * shows us the cookie-ack was lost. Imply it was 5945 * there. 5946 */ 5947 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5948 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5949 stcb->asoc.overall_error_count, 5950 0, 5951 SCTP_FROM_SCTP_INPUT, 5952 __LINE__); 5953 } 5954 stcb->asoc.overall_error_count = 0; 5955 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5956 break; 5957 case SCTP_STATE_COOKIE_WAIT: 5958 /* 5959 * We consider OOTB any data sent during asoc setup. 5960 */ 5961 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __FUNCTION__); 5962 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5963 msg); 5964 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5965 mflowtype, mflowid, inp->fibnum, 5966 vrf_id, port); 5967 goto out; 5968 /* sa_ignore NOTREACHED */ 5969 break; 5970 case SCTP_STATE_EMPTY: /* should not happen */ 5971 case SCTP_STATE_INUSE: /* should not happen */ 5972 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5973 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5974 default: 5975 goto out; 5976 /* sa_ignore NOTREACHED */ 5977 break; 5978 case SCTP_STATE_OPEN: 5979 case SCTP_STATE_SHUTDOWN_SENT: 5980 break; 5981 } 5982 /* plow through the data chunks while length > offset */ 5983 retval = sctp_process_data(mm, iphlen, &offset, length, 5984 src, dst, sh, 5985 inp, stcb, net, &high_tsn, 5986 mflowtype, mflowid, 5987 vrf_id, port); 5988 if (retval == 2) { 5989 /* 5990 * The association aborted, NO UNLOCK needed since 5991 * the association is destroyed. 5992 */ 5993 stcb = NULL; 5994 goto out; 5995 } 5996 data_processed = 1; 5997 /* 5998 * Anything important needs to have been m_copy'ed in 5999 * process_data 6000 */ 6001 } 6002 /* take care of ecn */ 6003 if ((data_processed == 1) && 6004 (stcb->asoc.ecn_supported == 1) && 6005 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6006 /* Yep, we need to add a ECNE */ 6007 sctp_send_ecn_echo(stcb, net, high_tsn); 6008 } 6009 if ((data_processed == 0) && (fwd_tsn_seen)) { 6010 int was_a_gap; 6011 uint32_t highest_tsn; 6012 6013 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6014 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6015 } else { 6016 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6017 } 6018 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6019 stcb->asoc.send_sack = 1; 6020 sctp_sack_check(stcb, was_a_gap); 6021 } else if (fwd_tsn_seen) { 6022 stcb->asoc.send_sack = 1; 6023 } 6024 /* trigger send of any chunks in queue... */ 6025 trigger_send: 6026 #ifdef SCTP_AUDITING_ENABLED 6027 sctp_audit_log(0xE0, 2); 6028 sctp_auditing(1, inp, stcb, net); 6029 #endif 6030 SCTPDBG(SCTP_DEBUG_INPUT1, 6031 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6032 stcb->asoc.peers_rwnd, 6033 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6034 stcb->asoc.total_flight); 6035 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6036 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6037 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6038 } 6039 if (cnt_ctrl_ready || 6040 ((un_sent) && 6041 (stcb->asoc.peers_rwnd > 0 || 6042 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6043 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6044 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6045 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6046 } 6047 #ifdef SCTP_AUDITING_ENABLED 6048 sctp_audit_log(0xE0, 3); 6049 sctp_auditing(2, inp, stcb, net); 6050 #endif 6051 out: 6052 if (stcb != NULL) { 6053 SCTP_TCB_UNLOCK(stcb); 6054 } 6055 if (inp_decr != NULL) { 6056 /* reduce ref-count */ 6057 SCTP_INP_WLOCK(inp_decr); 6058 SCTP_INP_DECR_REF(inp_decr); 6059 SCTP_INP_WUNLOCK(inp_decr); 6060 } 6061 #ifdef INVARIANTS 6062 if (inp != NULL) { 6063 sctp_validate_no_locks(inp); 6064 } 6065 #endif 6066 return; 6067 } 6068 6069 #ifdef INET 6070 void 6071 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6072 { 6073 struct mbuf *m; 6074 int iphlen; 6075 uint32_t vrf_id = 0; 6076 uint8_t ecn_bits; 6077 struct sockaddr_in src, dst; 6078 struct ip *ip; 6079 struct sctphdr *sh; 6080 struct sctp_chunkhdr *ch; 6081 int length, offset; 6082 6083 #if !defined(SCTP_WITH_NO_CSUM) 6084 uint8_t compute_crc; 6085 6086 #endif 6087 uint32_t mflowid; 6088 uint8_t mflowtype; 6089 uint16_t fibnum; 6090 6091 iphlen = off; 6092 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6093 SCTP_RELEASE_PKT(i_pak); 6094 return; 6095 } 6096 m = SCTP_HEADER_TO_CHAIN(i_pak); 6097 #ifdef SCTP_MBUF_LOGGING 6098 /* Log in any input mbufs */ 6099 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6100 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6101 } 6102 #endif 6103 #ifdef SCTP_PACKET_LOGGING 6104 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6105 sctp_packet_log(m); 6106 } 6107 #endif 6108 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6109 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6110 m->m_pkthdr.len, 6111 if_name(m->m_pkthdr.rcvif), 6112 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6113 mflowid = m->m_pkthdr.flowid; 6114 mflowtype = M_HASHTYPE_GET(m); 6115 fibnum = M_GETFIB(m); 6116 SCTP_STAT_INCR(sctps_recvpackets); 6117 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6118 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6119 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6120 if (SCTP_BUF_LEN(m) < offset) { 6121 if ((m = m_pullup(m, offset)) == NULL) { 6122 SCTP_STAT_INCR(sctps_hdrops); 6123 return; 6124 } 6125 } 6126 ip = mtod(m, struct ip *); 6127 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6128 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6129 offset -= sizeof(struct sctp_chunkhdr); 6130 memset(&src, 0, sizeof(struct sockaddr_in)); 6131 src.sin_family = AF_INET; 6132 src.sin_len = sizeof(struct sockaddr_in); 6133 src.sin_port = sh->src_port; 6134 src.sin_addr = ip->ip_src; 6135 memset(&dst, 0, sizeof(struct sockaddr_in)); 6136 dst.sin_family = AF_INET; 6137 dst.sin_len = sizeof(struct sockaddr_in); 6138 dst.sin_port = sh->dest_port; 6139 dst.sin_addr = ip->ip_dst; 6140 length = ntohs(ip->ip_len); 6141 /* Validate mbuf chain length with IP payload length. */ 6142 if (SCTP_HEADER_LEN(m) != length) { 6143 SCTPDBG(SCTP_DEBUG_INPUT1, 6144 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6145 SCTP_STAT_INCR(sctps_hdrops); 6146 goto out; 6147 } 6148 /* SCTP does not allow broadcasts or multicasts */ 6149 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6150 goto out; 6151 } 6152 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6153 goto out; 6154 } 6155 ecn_bits = ip->ip_tos; 6156 #if defined(SCTP_WITH_NO_CSUM) 6157 SCTP_STAT_INCR(sctps_recvnocrc); 6158 #else 6159 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6160 SCTP_STAT_INCR(sctps_recvhwcrc); 6161 compute_crc = 0; 6162 } else { 6163 SCTP_STAT_INCR(sctps_recvswcrc); 6164 compute_crc = 1; 6165 } 6166 #endif 6167 sctp_common_input_processing(&m, iphlen, offset, length, 6168 (struct sockaddr *)&src, 6169 (struct sockaddr *)&dst, 6170 sh, ch, 6171 #if !defined(SCTP_WITH_NO_CSUM) 6172 compute_crc, 6173 #endif 6174 ecn_bits, 6175 mflowtype, mflowid, fibnum, 6176 vrf_id, port); 6177 out: 6178 if (m) { 6179 sctp_m_freem(m); 6180 } 6181 return; 6182 } 6183 6184 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6185 extern int *sctp_cpuarry; 6186 6187 #endif 6188 6189 int 6190 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6191 { 6192 struct mbuf *m; 6193 int off; 6194 6195 m = *mp; 6196 off = *offp; 6197 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6198 if (mp_ncpus > 1) { 6199 struct ip *ip; 6200 struct sctphdr *sh; 6201 int offset; 6202 int cpu_to_use; 6203 uint32_t flowid, tag; 6204 6205 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6206 flowid = m->m_pkthdr.flowid; 6207 } else { 6208 /* 6209 * No flow id built by lower layers fix it so we 6210 * create one. 6211 */ 6212 offset = off + sizeof(struct sctphdr); 6213 if (SCTP_BUF_LEN(m) < offset) { 6214 if ((m = m_pullup(m, offset)) == NULL) { 6215 SCTP_STAT_INCR(sctps_hdrops); 6216 return (IPPROTO_DONE); 6217 } 6218 } 6219 ip = mtod(m, struct ip *); 6220 sh = (struct sctphdr *)((caddr_t)ip + off); 6221 tag = htonl(sh->v_tag); 6222 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6223 m->m_pkthdr.flowid = flowid; 6224 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6225 } 6226 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6227 sctp_queue_to_mcore(m, off, cpu_to_use); 6228 return (IPPROTO_DONE); 6229 } 6230 #endif 6231 sctp_input_with_port(m, off, 0); 6232 return (IPPROTO_DONE); 6233 } 6234 6235 #endif 6236