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, struct sctp_nets *net, 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, net, m, iphlen, offset, 202 src, dst, 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 retval = sctp_send_cookie_echo(m, offset, stcb, net); 525 if (retval < 0) { 526 /* 527 * No cookie, we probably should send a op error. But in any 528 * case if there is no cookie in the INIT-ACK, we can 529 * abandon the peer, its broke. 530 */ 531 if (retval == -3) { 532 uint16_t len; 533 534 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 535 /* We abort with an error of missing mandatory param */ 536 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 537 if (op_err != NULL) { 538 struct sctp_error_missing_param *cause; 539 540 SCTP_BUF_LEN(op_err) = len; 541 cause = mtod(op_err, struct sctp_error_missing_param *); 542 /* Subtract the reserved param */ 543 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 544 cause->cause.length = htons(len); 545 cause->num_missing_params = htonl(1); 546 cause->type[0] = htons(SCTP_STATE_COOKIE); 547 } 548 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 549 src, dst, sh, op_err, 550 mflowtype, mflowid, 551 vrf_id, net->port); 552 *abort_no_unlock = 1; 553 } 554 return (retval); 555 } 556 return (0); 557 } 558 559 static void 560 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 561 struct sctp_tcb *stcb, struct sctp_nets *net) 562 { 563 union sctp_sockstore store; 564 struct sctp_nets *r_net, *f_net; 565 struct timeval tv; 566 int req_prim = 0; 567 uint16_t old_error_counter; 568 569 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 570 /* Invalid length */ 571 return; 572 } 573 memset(&store, 0, sizeof(store)); 574 switch (cp->heartbeat.hb_info.addr_family) { 575 #ifdef INET 576 case AF_INET: 577 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 578 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 579 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 580 store.sin.sin_port = stcb->rport; 581 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 582 sizeof(store.sin.sin_addr)); 583 } else { 584 return; 585 } 586 break; 587 #endif 588 #ifdef INET6 589 case AF_INET6: 590 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 591 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 592 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 593 store.sin6.sin6_port = stcb->rport; 594 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 595 } else { 596 return; 597 } 598 break; 599 #endif 600 default: 601 return; 602 } 603 r_net = sctp_findnet(stcb, &store.sa); 604 if (r_net == NULL) { 605 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 606 return; 607 } 608 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 609 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 610 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 611 /* 612 * If the its a HB and it's random value is correct when can 613 * confirm the destination. 614 */ 615 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 616 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 617 stcb->asoc.primary_destination = r_net; 618 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 619 f_net = TAILQ_FIRST(&stcb->asoc.nets); 620 if (f_net != r_net) { 621 /* 622 * first one on the list is NOT the primary 623 * sctp_cmpaddr() is much more efficent if 624 * the primary is the first on the list, 625 * make it so. 626 */ 627 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 628 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 629 } 630 req_prim = 1; 631 } 632 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 633 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 634 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 635 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 636 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 637 } 638 old_error_counter = r_net->error_count; 639 r_net->error_count = 0; 640 r_net->hb_responded = 1; 641 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 642 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 643 /* Now lets do a RTO with this */ 644 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 645 SCTP_RTT_FROM_NON_DATA); 646 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 647 r_net->dest_state |= SCTP_ADDR_REACHABLE; 648 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 649 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 650 } 651 if (r_net->dest_state & SCTP_ADDR_PF) { 652 r_net->dest_state &= ~SCTP_ADDR_PF; 653 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 654 } 655 if (old_error_counter > 0) { 656 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 657 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 677 stcb->sctp_ep, stcb, NULL, 678 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 679 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_FASTHANDOFF)) { 681 sctp_assoc_immediate_retrans(stcb, 682 stcb->asoc.primary_destination); 683 } 684 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 685 SCTP_MOBILITY_BASE)) { 686 sctp_move_chunks_from_net(stcb, 687 stcb->asoc.deleted_primary); 688 } 689 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 690 stcb->asoc.deleted_primary); 691 } 692 } 693 } 694 695 static int 696 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 697 { 698 /* 699 * return 0 means we want you to proceed with the abort non-zero 700 * means no abort processing 701 */ 702 struct sctpasochead *head; 703 704 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 705 /* generate a new vtag and send init */ 706 LIST_REMOVE(stcb, sctp_asocs); 707 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 708 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 709 /* 710 * put it in the bucket in the vtag hash of assoc's for the 711 * system 712 */ 713 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 714 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 715 return (1); 716 } 717 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 718 /* 719 * treat like a case where the cookie expired i.e.: - dump 720 * current cookie. - generate a new vtag. - resend init. 721 */ 722 /* generate a new vtag and send init */ 723 LIST_REMOVE(stcb, sctp_asocs); 724 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 725 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 726 sctp_stop_all_cookie_timers(stcb); 727 sctp_toss_old_cookies(stcb, &stcb->asoc); 728 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 729 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 730 /* 731 * put it in the bucket in the vtag hash of assoc's for the 732 * system 733 */ 734 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 return (1); 737 } 738 return (0); 739 } 740 741 static int 742 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 743 struct sctp_nets *net) 744 { 745 /* 746 * return 0 means we want you to proceed with the abort non-zero 747 * means no abort processing 748 */ 749 if (stcb->asoc.auth_supported == 0) { 750 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 751 return (0); 752 } 753 sctp_asconf_send_nat_state_update(stcb, net); 754 return (1); 755 } 756 757 758 static void 759 sctp_handle_abort(struct sctp_abort_chunk *abort, 760 struct sctp_tcb *stcb, struct sctp_nets *net) 761 { 762 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 763 struct socket *so; 764 765 #endif 766 uint16_t len; 767 uint16_t error; 768 769 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 770 if (stcb == NULL) 771 return; 772 773 len = ntohs(abort->ch.chunk_length); 774 if (len > sizeof(struct sctp_chunkhdr)) { 775 /* 776 * Need to check the cause codes for our two magic nat 777 * aborts which don't kill the assoc necessarily. 778 */ 779 struct sctp_gen_error_cause *cause; 780 781 cause = (struct sctp_gen_error_cause *)(abort + 1); 782 error = ntohs(cause->code); 783 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 784 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 785 abort->ch.chunk_flags); 786 if (sctp_handle_nat_colliding_state(stcb)) { 787 return; 788 } 789 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 790 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 791 abort->ch.chunk_flags); 792 if (sctp_handle_nat_missing_state(stcb, net)) { 793 return; 794 } 795 } 796 } else { 797 error = 0; 798 } 799 /* stop any receive timers */ 800 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 801 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 802 /* notify user of the abort and clean up... */ 803 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 804 /* free the tcb */ 805 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 806 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 807 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 808 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 809 } 810 #ifdef SCTP_ASOCLOG_OF_TSNS 811 sctp_print_out_track_log(stcb); 812 #endif 813 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 814 so = SCTP_INP_SO(stcb->sctp_ep); 815 atomic_add_int(&stcb->asoc.refcnt, 1); 816 SCTP_TCB_UNLOCK(stcb); 817 SCTP_SOCKET_LOCK(so, 1); 818 SCTP_TCB_LOCK(stcb); 819 atomic_subtract_int(&stcb->asoc.refcnt, 1); 820 #endif 821 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 822 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 823 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 824 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 825 SCTP_SOCKET_UNLOCK(so, 1); 826 #endif 827 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 828 } 829 830 static void 831 sctp_start_net_timers(struct sctp_tcb *stcb) 832 { 833 uint32_t cnt_hb_sent; 834 struct sctp_nets *net; 835 836 cnt_hb_sent = 0; 837 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 838 /* 839 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 840 * If the dest in unconfirmed send a hb as well if under 841 * max_hb_burst have been sent. 842 */ 843 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 844 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 845 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 846 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 847 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 848 cnt_hb_sent++; 849 } 850 } 851 if (cnt_hb_sent) { 852 sctp_chunk_output(stcb->sctp_ep, stcb, 853 SCTP_OUTPUT_FROM_COOKIE_ACK, 854 SCTP_SO_NOT_LOCKED); 855 } 856 } 857 858 859 static void 860 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 861 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 862 { 863 struct sctp_association *asoc; 864 int some_on_streamwheel; 865 int old_state; 866 867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 868 struct socket *so; 869 870 #endif 871 872 SCTPDBG(SCTP_DEBUG_INPUT2, 873 "sctp_handle_shutdown: handling SHUTDOWN\n"); 874 if (stcb == NULL) 875 return; 876 asoc = &stcb->asoc; 877 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 878 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 879 return; 880 } 881 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 882 /* Shutdown NOT the expected size */ 883 return; 884 } 885 old_state = SCTP_GET_STATE(asoc); 886 sctp_update_acked(stcb, cp, abort_flag); 887 if (*abort_flag) { 888 return; 889 } 890 if (asoc->control_pdapi) { 891 /* 892 * With a normal shutdown we assume the end of last record. 893 */ 894 SCTP_INP_READ_LOCK(stcb->sctp_ep); 895 asoc->control_pdapi->end_added = 1; 896 asoc->control_pdapi->pdapi_aborted = 1; 897 asoc->control_pdapi = NULL; 898 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 899 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 900 so = SCTP_INP_SO(stcb->sctp_ep); 901 atomic_add_int(&stcb->asoc.refcnt, 1); 902 SCTP_TCB_UNLOCK(stcb); 903 SCTP_SOCKET_LOCK(so, 1); 904 SCTP_TCB_LOCK(stcb); 905 atomic_subtract_int(&stcb->asoc.refcnt, 1); 906 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 907 /* assoc was freed while we were unlocked */ 908 SCTP_SOCKET_UNLOCK(so, 1); 909 return; 910 } 911 #endif 912 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 914 SCTP_SOCKET_UNLOCK(so, 1); 915 #endif 916 } 917 /* goto SHUTDOWN_RECEIVED state to block new requests */ 918 if (stcb->sctp_socket) { 919 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 920 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 922 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 923 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 924 /* 925 * notify upper layer that peer has initiated a 926 * shutdown 927 */ 928 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 929 930 /* reset time */ 931 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 932 } 933 } 934 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 935 /* 936 * stop the shutdown timer, since we WILL move to 937 * SHUTDOWN-ACK-SENT. 938 */ 939 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 940 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 941 } 942 /* Now is there unsent data on a stream somewhere? */ 943 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 944 945 if (!TAILQ_EMPTY(&asoc->send_queue) || 946 !TAILQ_EMPTY(&asoc->sent_queue) || 947 some_on_streamwheel) { 948 /* By returning we will push more data out */ 949 return; 950 } else { 951 /* no outstanding data to send, so move on... */ 952 /* send SHUTDOWN-ACK */ 953 /* move to SHUTDOWN-ACK-SENT state */ 954 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 955 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 956 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 957 } 958 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 959 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 960 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 961 sctp_stop_timers_for_shutdown(stcb); 962 sctp_send_shutdown_ack(stcb, net); 963 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 964 stcb->sctp_ep, stcb, net); 965 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 966 sctp_send_shutdown_ack(stcb, net); 967 } 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 ntohs(initack_cp->init.num_outbound_streams), 2107 (struct thread *)NULL 2108 ); 2109 if (stcb == NULL) { 2110 struct mbuf *op_err; 2111 2112 /* memory problem? */ 2113 SCTPDBG(SCTP_DEBUG_INPUT1, 2114 "process_cookie_new: no room for another TCB!\n"); 2115 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2116 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2117 src, dst, sh, op_err, 2118 mflowtype, mflowid, 2119 vrf_id, port); 2120 return (NULL); 2121 } 2122 /* get the correct sctp_nets */ 2123 if (netp) 2124 *netp = sctp_findnet(stcb, init_src); 2125 2126 asoc = &stcb->asoc; 2127 /* get scope variables out of cookie */ 2128 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2129 asoc->scope.site_scope = cookie->site_scope; 2130 asoc->scope.local_scope = cookie->local_scope; 2131 asoc->scope.loopback_scope = cookie->loopback_scope; 2132 2133 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2134 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2135 struct mbuf *op_err; 2136 2137 /* 2138 * Houston we have a problem. The EP changed while the 2139 * cookie was in flight. Only recourse is to abort the 2140 * association. 2141 */ 2142 atomic_add_int(&stcb->asoc.refcnt, 1); 2143 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2144 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2145 src, dst, sh, op_err, 2146 mflowtype, mflowid, 2147 vrf_id, port); 2148 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2149 SCTP_TCB_UNLOCK(stcb); 2150 SCTP_SOCKET_LOCK(so, 1); 2151 SCTP_TCB_LOCK(stcb); 2152 #endif 2153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2154 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2155 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2156 SCTP_SOCKET_UNLOCK(so, 1); 2157 #endif 2158 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2159 return (NULL); 2160 } 2161 /* process the INIT-ACK info (my info) */ 2162 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2163 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2164 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2165 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2166 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2167 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2168 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2169 asoc->str_reset_seq_in = asoc->init_seq_number; 2170 2171 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2172 2173 /* process the INIT info (peer's info) */ 2174 if (netp) 2175 retval = sctp_process_init(init_cp, stcb); 2176 else 2177 retval = 0; 2178 if (retval < 0) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184 #endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2186 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2187 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2188 SCTP_SOCKET_UNLOCK(so, 1); 2189 #endif 2190 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2191 return (NULL); 2192 } 2193 /* load all addresses */ 2194 if (sctp_load_addresses_from_init(stcb, m, 2195 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2196 src, dst, init_src)) { 2197 atomic_add_int(&stcb->asoc.refcnt, 1); 2198 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2199 SCTP_TCB_UNLOCK(stcb); 2200 SCTP_SOCKET_LOCK(so, 1); 2201 SCTP_TCB_LOCK(stcb); 2202 #endif 2203 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2204 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2205 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2206 SCTP_SOCKET_UNLOCK(so, 1); 2207 #endif 2208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2209 return (NULL); 2210 } 2211 /* 2212 * verify any preceding AUTH chunk that was skipped 2213 */ 2214 /* pull the local authentication parameters from the cookie/init-ack */ 2215 sctp_auth_get_cookie_params(stcb, m, 2216 initack_offset + sizeof(struct sctp_init_ack_chunk), 2217 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2218 if (auth_skipped) { 2219 struct sctp_auth_chunk *auth; 2220 2221 auth = (struct sctp_auth_chunk *) 2222 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2223 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2224 /* auth HMAC failed, dump the assoc and packet */ 2225 SCTPDBG(SCTP_DEBUG_AUTH1, 2226 "COOKIE-ECHO: AUTH failed\n"); 2227 atomic_add_int(&stcb->asoc.refcnt, 1); 2228 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2229 SCTP_TCB_UNLOCK(stcb); 2230 SCTP_SOCKET_LOCK(so, 1); 2231 SCTP_TCB_LOCK(stcb); 2232 #endif 2233 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2234 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 SCTP_SOCKET_UNLOCK(so, 1); 2237 #endif 2238 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2239 return (NULL); 2240 } else { 2241 /* remaining chunks checked... good to go */ 2242 stcb->asoc.authenticated = 1; 2243 } 2244 } 2245 /* update current state */ 2246 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2247 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2248 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2249 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2250 stcb->sctp_ep, stcb, asoc->primary_destination); 2251 } 2252 sctp_stop_all_cookie_timers(stcb); 2253 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2254 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2255 2256 /* 2257 * if we're doing ASCONFs, check to see if we have any new local 2258 * addresses that need to get added to the peer (eg. addresses 2259 * changed while cookie echo in flight). This needs to be done 2260 * after we go to the OPEN state to do the correct asconf 2261 * processing. else, make sure we have the correct addresses in our 2262 * lists 2263 */ 2264 2265 /* warning, we re-use sin, sin6, sa_store here! */ 2266 /* pull in local_address (our "from" address) */ 2267 switch (cookie->laddr_type) { 2268 #ifdef INET 2269 case SCTP_IPV4_ADDRESS: 2270 /* source addr is IPv4 */ 2271 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2272 store.sin.sin_family = AF_INET; 2273 store.sin.sin_len = sizeof(struct sockaddr_in); 2274 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2275 break; 2276 #endif 2277 #ifdef INET6 2278 case SCTP_IPV6_ADDRESS: 2279 /* source addr is IPv6 */ 2280 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2281 store.sin6.sin6_family = AF_INET6; 2282 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2283 store.sin6.sin6_scope_id = cookie->scope_id; 2284 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2285 break; 2286 #endif 2287 default: 2288 atomic_add_int(&stcb->asoc.refcnt, 1); 2289 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2290 SCTP_TCB_UNLOCK(stcb); 2291 SCTP_SOCKET_LOCK(so, 1); 2292 SCTP_TCB_LOCK(stcb); 2293 #endif 2294 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2295 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 SCTP_SOCKET_UNLOCK(so, 1); 2298 #endif 2299 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2300 return (NULL); 2301 } 2302 2303 /* set up to notify upper layer */ 2304 *notification = SCTP_NOTIFY_ASSOC_UP; 2305 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2306 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2307 (inp->sctp_socket->so_qlimit == 0)) { 2308 /* 2309 * This is an endpoint that called connect() how it got a 2310 * cookie that is NEW is a bit of a mystery. It must be that 2311 * the INIT was sent, but before it got there.. a complete 2312 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2313 * should have went to the other code.. not here.. oh well.. 2314 * a bit of protection is worth having.. 2315 */ 2316 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2318 atomic_add_int(&stcb->asoc.refcnt, 1); 2319 SCTP_TCB_UNLOCK(stcb); 2320 SCTP_SOCKET_LOCK(so, 1); 2321 SCTP_TCB_LOCK(stcb); 2322 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2323 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2324 SCTP_SOCKET_UNLOCK(so, 1); 2325 return (NULL); 2326 } 2327 #endif 2328 soisconnected(stcb->sctp_socket); 2329 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2330 SCTP_SOCKET_UNLOCK(so, 1); 2331 #endif 2332 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2333 (inp->sctp_socket->so_qlimit)) { 2334 /* 2335 * We don't want to do anything with this one. Since it is 2336 * the listening guy. The timer will get started for 2337 * accepted connections in the caller. 2338 */ 2339 ; 2340 } 2341 /* since we did not send a HB make sure we don't double things */ 2342 if ((netp) && (*netp)) 2343 (*netp)->hb_responded = 1; 2344 2345 if (stcb->asoc.sctp_autoclose_ticks && 2346 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2347 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2348 } 2349 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2350 if ((netp != NULL) && (*netp != NULL)) { 2351 /* calculate the RTT and set the encaps port */ 2352 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2353 &cookie->time_entered, sctp_align_unsafe_makecopy, 2354 SCTP_RTT_FROM_NON_DATA); 2355 #if defined(INET) || defined(INET6) 2356 if (((*netp)->port == 0) && (port != 0)) { 2357 sctp_pathmtu_adjustment(stcb, (*netp)->mtu - sizeof(struct udphdr)); 2358 } 2359 (*netp)->port = port; 2360 #endif 2361 } 2362 /* respond with a COOKIE-ACK */ 2363 sctp_send_cookie_ack(stcb); 2364 2365 /* 2366 * check the address lists for any ASCONFs that need to be sent 2367 * AFTER the cookie-ack is sent 2368 */ 2369 sctp_check_address_list(stcb, m, 2370 initack_offset + sizeof(struct sctp_init_ack_chunk), 2371 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2372 &store.sa, cookie->local_scope, cookie->site_scope, 2373 cookie->ipv4_scope, cookie->loopback_scope); 2374 2375 2376 return (stcb); 2377 } 2378 2379 /* 2380 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2381 * we NEED to make sure we are not already using the vtag. If so we 2382 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2383 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2384 SCTP_BASE_INFO(hashasocmark))]; 2385 LIST_FOREACH(stcb, head, sctp_asocs) { 2386 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2387 -- SEND ABORT - TRY AGAIN -- 2388 } 2389 } 2390 */ 2391 2392 /* 2393 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2394 * existing (non-NULL) TCB 2395 */ 2396 static struct mbuf * 2397 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2398 struct sockaddr *src, struct sockaddr *dst, 2399 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2400 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2401 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2402 struct sctp_tcb **locked_tcb, 2403 uint8_t mflowtype, uint32_t mflowid, 2404 uint32_t vrf_id, uint16_t port) 2405 { 2406 struct sctp_state_cookie *cookie; 2407 struct sctp_tcb *l_stcb = *stcb; 2408 struct sctp_inpcb *l_inp; 2409 struct sockaddr *to; 2410 struct sctp_pcb *ep; 2411 struct mbuf *m_sig; 2412 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2413 uint8_t *sig; 2414 uint8_t cookie_ok = 0; 2415 unsigned int sig_offset, cookie_offset; 2416 unsigned int cookie_len; 2417 struct timeval now; 2418 struct timeval time_expires; 2419 int notification = 0; 2420 struct sctp_nets *netl; 2421 int had_a_existing_tcb = 0; 2422 int send_int_conf = 0; 2423 2424 #ifdef INET 2425 struct sockaddr_in sin; 2426 2427 #endif 2428 #ifdef INET6 2429 struct sockaddr_in6 sin6; 2430 2431 #endif 2432 2433 SCTPDBG(SCTP_DEBUG_INPUT2, 2434 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2435 2436 if (inp_p == NULL) { 2437 return (NULL); 2438 } 2439 cookie = &cp->cookie; 2440 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2441 cookie_len = ntohs(cp->ch.chunk_length); 2442 2443 if ((cookie->peerport != sh->src_port) || 2444 (cookie->myport != sh->dest_port) || 2445 (cookie->my_vtag != sh->v_tag)) { 2446 /* 2447 * invalid ports or bad tag. Note that we always leave the 2448 * v_tag in the header in network order and when we stored 2449 * it in the my_vtag slot we also left it in network order. 2450 * This maintains the match even though it may be in the 2451 * opposite byte order of the machine :-> 2452 */ 2453 return (NULL); 2454 } 2455 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2456 sizeof(struct sctp_init_chunk) + 2457 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2458 /* cookie too small */ 2459 return (NULL); 2460 } 2461 /* 2462 * split off the signature into its own mbuf (since it should not be 2463 * calculated in the sctp_hmac_m() call). 2464 */ 2465 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2466 m_sig = m_split(m, sig_offset, M_NOWAIT); 2467 if (m_sig == NULL) { 2468 /* out of memory or ?? */ 2469 return (NULL); 2470 } 2471 #ifdef SCTP_MBUF_LOGGING 2472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2473 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2474 } 2475 #endif 2476 2477 /* 2478 * compute the signature/digest for the cookie 2479 */ 2480 ep = &(*inp_p)->sctp_ep; 2481 l_inp = *inp_p; 2482 if (l_stcb) { 2483 SCTP_TCB_UNLOCK(l_stcb); 2484 } 2485 SCTP_INP_RLOCK(l_inp); 2486 if (l_stcb) { 2487 SCTP_TCB_LOCK(l_stcb); 2488 } 2489 /* which cookie is it? */ 2490 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2491 (ep->current_secret_number != ep->last_secret_number)) { 2492 /* it's the old cookie */ 2493 (void)sctp_hmac_m(SCTP_HMAC, 2494 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2495 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2496 } else { 2497 /* it's the current cookie */ 2498 (void)sctp_hmac_m(SCTP_HMAC, 2499 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2500 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2501 } 2502 /* get the signature */ 2503 SCTP_INP_RUNLOCK(l_inp); 2504 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2505 if (sig == NULL) { 2506 /* couldn't find signature */ 2507 sctp_m_freem(m_sig); 2508 return (NULL); 2509 } 2510 /* compare the received digest with the computed digest */ 2511 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2512 /* try the old cookie? */ 2513 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2514 (ep->current_secret_number != ep->last_secret_number)) { 2515 /* compute digest with old */ 2516 (void)sctp_hmac_m(SCTP_HMAC, 2517 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2518 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2519 /* compare */ 2520 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2521 cookie_ok = 1; 2522 } 2523 } else { 2524 cookie_ok = 1; 2525 } 2526 2527 /* 2528 * Now before we continue we must reconstruct our mbuf so that 2529 * normal processing of any other chunks will work. 2530 */ 2531 { 2532 struct mbuf *m_at; 2533 2534 m_at = m; 2535 while (SCTP_BUF_NEXT(m_at) != NULL) { 2536 m_at = SCTP_BUF_NEXT(m_at); 2537 } 2538 SCTP_BUF_NEXT(m_at) = m_sig; 2539 } 2540 2541 if (cookie_ok == 0) { 2542 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2543 SCTPDBG(SCTP_DEBUG_INPUT2, 2544 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2545 (uint32_t) offset, cookie_offset, sig_offset); 2546 return (NULL); 2547 } 2548 /* 2549 * check the cookie timestamps to be sure it's not stale 2550 */ 2551 (void)SCTP_GETTIME_TIMEVAL(&now); 2552 /* Expire time is in Ticks, so we convert to seconds */ 2553 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2554 time_expires.tv_usec = cookie->time_entered.tv_usec; 2555 /* 2556 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2557 * is undefined. 2558 */ 2559 if (timevalcmp(&now, &time_expires, >)) { 2560 /* cookie is stale! */ 2561 struct mbuf *op_err; 2562 struct sctp_error_stale_cookie *cause; 2563 uint32_t tim; 2564 2565 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2566 0, M_NOWAIT, 1, MT_DATA); 2567 if (op_err == NULL) { 2568 /* FOOBAR */ 2569 return (NULL); 2570 } 2571 /* Set the len */ 2572 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2573 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2574 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2575 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2576 (sizeof(uint32_t)))); 2577 /* seconds to usec */ 2578 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2579 /* add in usec */ 2580 if (tim == 0) 2581 tim = now.tv_usec - cookie->time_entered.tv_usec; 2582 cause->stale_time = htonl(tim); 2583 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2584 mflowtype, mflowid, l_inp->fibnum, 2585 vrf_id, port); 2586 return (NULL); 2587 } 2588 /* 2589 * Now we must see with the lookup address if we have an existing 2590 * asoc. This will only happen if we were in the COOKIE-WAIT state 2591 * and a INIT collided with us and somewhere the peer sent the 2592 * cookie on another address besides the single address our assoc 2593 * had for him. In this case we will have one of the tie-tags set at 2594 * least AND the address field in the cookie can be used to look it 2595 * up. 2596 */ 2597 to = NULL; 2598 switch (cookie->addr_type) { 2599 #ifdef INET6 2600 case SCTP_IPV6_ADDRESS: 2601 memset(&sin6, 0, sizeof(sin6)); 2602 sin6.sin6_family = AF_INET6; 2603 sin6.sin6_len = sizeof(sin6); 2604 sin6.sin6_port = sh->src_port; 2605 sin6.sin6_scope_id = cookie->scope_id; 2606 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2607 sizeof(sin6.sin6_addr.s6_addr)); 2608 to = (struct sockaddr *)&sin6; 2609 break; 2610 #endif 2611 #ifdef INET 2612 case SCTP_IPV4_ADDRESS: 2613 memset(&sin, 0, sizeof(sin)); 2614 sin.sin_family = AF_INET; 2615 sin.sin_len = sizeof(sin); 2616 sin.sin_port = sh->src_port; 2617 sin.sin_addr.s_addr = cookie->address[0]; 2618 to = (struct sockaddr *)&sin; 2619 break; 2620 #endif 2621 default: 2622 /* This should not happen */ 2623 return (NULL); 2624 } 2625 if (*stcb == NULL) { 2626 /* Yep, lets check */ 2627 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2628 if (*stcb == NULL) { 2629 /* 2630 * We should have only got back the same inp. If we 2631 * got back a different ep we have a problem. The 2632 * original findep got back l_inp and now 2633 */ 2634 if (l_inp != *inp_p) { 2635 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2636 } 2637 } else { 2638 if (*locked_tcb == NULL) { 2639 /* 2640 * In this case we found the assoc only 2641 * after we locked the create lock. This 2642 * means we are in a colliding case and we 2643 * must make sure that we unlock the tcb if 2644 * its one of the cases where we throw away 2645 * the incoming packets. 2646 */ 2647 *locked_tcb = *stcb; 2648 2649 /* 2650 * We must also increment the inp ref count 2651 * since the ref_count flags was set when we 2652 * did not find the TCB, now we found it 2653 * which reduces the refcount.. we must 2654 * raise it back out to balance it all :-) 2655 */ 2656 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2657 if ((*stcb)->sctp_ep != l_inp) { 2658 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2659 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2660 } 2661 } 2662 } 2663 } 2664 cookie_len -= SCTP_SIGNATURE_SIZE; 2665 if (*stcb == NULL) { 2666 /* this is the "normal" case... get a new TCB */ 2667 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2668 cookie, cookie_len, *inp_p, 2669 netp, to, ¬ification, 2670 auth_skipped, auth_offset, auth_len, 2671 mflowtype, mflowid, 2672 vrf_id, port); 2673 } else { 2674 /* this is abnormal... cookie-echo on existing TCB */ 2675 had_a_existing_tcb = 1; 2676 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2677 src, dst, sh, 2678 cookie, cookie_len, *inp_p, *stcb, netp, to, 2679 ¬ification, auth_skipped, auth_offset, auth_len, 2680 mflowtype, mflowid, 2681 vrf_id, port); 2682 } 2683 2684 if (*stcb == NULL) { 2685 /* still no TCB... must be bad cookie-echo */ 2686 return (NULL); 2687 } 2688 if (*netp != NULL) { 2689 (*netp)->flowtype = mflowtype; 2690 (*netp)->flowid = mflowid; 2691 } 2692 /* 2693 * Ok, we built an association so confirm the address we sent the 2694 * INIT-ACK to. 2695 */ 2696 netl = sctp_findnet(*stcb, to); 2697 /* 2698 * This code should in theory NOT run but 2699 */ 2700 if (netl == NULL) { 2701 /* TSNH! Huh, why do I need to add this address here? */ 2702 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2703 return (NULL); 2704 } 2705 netl = sctp_findnet(*stcb, to); 2706 } 2707 if (netl) { 2708 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2709 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2710 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2711 netl); 2712 send_int_conf = 1; 2713 } 2714 } 2715 sctp_start_net_timers(*stcb); 2716 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2717 if (!had_a_existing_tcb || 2718 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2719 /* 2720 * If we have a NEW cookie or the connect never 2721 * reached the connected state during collision we 2722 * must do the TCP accept thing. 2723 */ 2724 struct socket *so, *oso; 2725 struct sctp_inpcb *inp; 2726 2727 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2728 /* 2729 * For a restart we will keep the same 2730 * socket, no need to do anything. I THINK!! 2731 */ 2732 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2733 if (send_int_conf) { 2734 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2735 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2736 } 2737 return (m); 2738 } 2739 oso = (*inp_p)->sctp_socket; 2740 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2741 SCTP_TCB_UNLOCK((*stcb)); 2742 CURVNET_SET(oso->so_vnet); 2743 so = sonewconn(oso, 0 2744 ); 2745 CURVNET_RESTORE(); 2746 SCTP_TCB_LOCK((*stcb)); 2747 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2748 2749 if (so == NULL) { 2750 struct mbuf *op_err; 2751 2752 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2753 struct socket *pcb_so; 2754 2755 #endif 2756 /* Too many sockets */ 2757 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2758 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2759 sctp_abort_association(*inp_p, NULL, m, iphlen, 2760 src, dst, sh, op_err, 2761 mflowtype, mflowid, 2762 vrf_id, port); 2763 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2764 pcb_so = SCTP_INP_SO(*inp_p); 2765 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2766 SCTP_TCB_UNLOCK((*stcb)); 2767 SCTP_SOCKET_LOCK(pcb_so, 1); 2768 SCTP_TCB_LOCK((*stcb)); 2769 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2770 #endif 2771 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2772 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2773 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2774 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2775 #endif 2776 return (NULL); 2777 } 2778 inp = (struct sctp_inpcb *)so->so_pcb; 2779 SCTP_INP_INCR_REF(inp); 2780 /* 2781 * We add the unbound flag here so that if we get an 2782 * soabort() before we get the move_pcb done, we 2783 * will properly cleanup. 2784 */ 2785 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2786 SCTP_PCB_FLAGS_CONNECTED | 2787 SCTP_PCB_FLAGS_IN_TCPPOOL | 2788 SCTP_PCB_FLAGS_UNBOUND | 2789 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2790 SCTP_PCB_FLAGS_DONT_WAKE); 2791 inp->sctp_features = (*inp_p)->sctp_features; 2792 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2793 inp->sctp_socket = so; 2794 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2795 inp->max_cwnd = (*inp_p)->max_cwnd; 2796 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2797 inp->ecn_supported = (*inp_p)->ecn_supported; 2798 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2799 inp->auth_supported = (*inp_p)->auth_supported; 2800 inp->asconf_supported = (*inp_p)->asconf_supported; 2801 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2802 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2803 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2804 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2805 inp->sctp_context = (*inp_p)->sctp_context; 2806 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2807 inp->fibnum = (*inp_p)->fibnum; 2808 inp->inp_starting_point_for_iterator = NULL; 2809 /* 2810 * copy in the authentication parameters from the 2811 * original endpoint 2812 */ 2813 if (inp->sctp_ep.local_hmacs) 2814 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2815 inp->sctp_ep.local_hmacs = 2816 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2817 if (inp->sctp_ep.local_auth_chunks) 2818 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2819 inp->sctp_ep.local_auth_chunks = 2820 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2821 2822 /* 2823 * Now we must move it from one hash table to 2824 * another and get the tcb in the right place. 2825 */ 2826 2827 /* 2828 * This is where the one-2-one socket is put into 2829 * the accept state waiting for the accept! 2830 */ 2831 if (*stcb) { 2832 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2833 } 2834 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2835 2836 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2837 SCTP_TCB_UNLOCK((*stcb)); 2838 2839 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2840 0); 2841 SCTP_TCB_LOCK((*stcb)); 2842 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2843 2844 2845 /* 2846 * now we must check to see if we were aborted while 2847 * the move was going on and the lock/unlock 2848 * happened. 2849 */ 2850 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2851 /* 2852 * yep it was, we leave the assoc attached 2853 * to the socket since the sctp_inpcb_free() 2854 * call will send an abort for us. 2855 */ 2856 SCTP_INP_DECR_REF(inp); 2857 return (NULL); 2858 } 2859 SCTP_INP_DECR_REF(inp); 2860 /* Switch over to the new guy */ 2861 *inp_p = inp; 2862 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2863 if (send_int_conf) { 2864 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2865 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2866 } 2867 /* 2868 * Pull it from the incomplete queue and wake the 2869 * guy 2870 */ 2871 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2872 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2873 SCTP_TCB_UNLOCK((*stcb)); 2874 SCTP_SOCKET_LOCK(so, 1); 2875 #endif 2876 soisconnected(so); 2877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2878 SCTP_TCB_LOCK((*stcb)); 2879 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2880 SCTP_SOCKET_UNLOCK(so, 1); 2881 #endif 2882 return (m); 2883 } 2884 } 2885 if (notification) { 2886 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2887 } 2888 if (send_int_conf) { 2889 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2890 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2891 } 2892 return (m); 2893 } 2894 2895 static void 2896 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2897 struct sctp_tcb *stcb, struct sctp_nets *net) 2898 { 2899 /* cp must not be used, others call this without a c-ack :-) */ 2900 struct sctp_association *asoc; 2901 2902 SCTPDBG(SCTP_DEBUG_INPUT2, 2903 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2904 if ((stcb == NULL) || (net == NULL)) { 2905 return; 2906 } 2907 asoc = &stcb->asoc; 2908 2909 sctp_stop_all_cookie_timers(stcb); 2910 /* process according to association state */ 2911 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2912 /* state change only needed when I am in right state */ 2913 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2914 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2915 sctp_start_net_timers(stcb); 2916 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2917 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2918 stcb->sctp_ep, stcb, asoc->primary_destination); 2919 2920 } 2921 /* update RTO */ 2922 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2923 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2924 if (asoc->overall_error_count == 0) { 2925 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2926 &asoc->time_entered, sctp_align_safe_nocopy, 2927 SCTP_RTT_FROM_NON_DATA); 2928 } 2929 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2930 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2931 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2932 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2933 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2934 struct socket *so; 2935 2936 #endif 2937 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2938 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2939 so = SCTP_INP_SO(stcb->sctp_ep); 2940 atomic_add_int(&stcb->asoc.refcnt, 1); 2941 SCTP_TCB_UNLOCK(stcb); 2942 SCTP_SOCKET_LOCK(so, 1); 2943 SCTP_TCB_LOCK(stcb); 2944 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2945 #endif 2946 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2947 soisconnected(stcb->sctp_socket); 2948 } 2949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2950 SCTP_SOCKET_UNLOCK(so, 1); 2951 #endif 2952 } 2953 /* 2954 * since we did not send a HB make sure we don't double 2955 * things 2956 */ 2957 net->hb_responded = 1; 2958 2959 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2960 /* 2961 * We don't need to do the asconf thing, nor hb or 2962 * autoclose if the socket is closed. 2963 */ 2964 goto closed_socket; 2965 } 2966 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2967 stcb, net); 2968 2969 2970 if (stcb->asoc.sctp_autoclose_ticks && 2971 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2972 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2973 stcb->sctp_ep, stcb, NULL); 2974 } 2975 /* 2976 * send ASCONF if parameters are pending and ASCONFs are 2977 * allowed (eg. addresses changed when init/cookie echo were 2978 * in flight) 2979 */ 2980 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2981 (stcb->asoc.asconf_supported == 1) && 2982 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2983 #ifdef SCTP_TIMER_BASED_ASCONF 2984 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2985 stcb->sctp_ep, stcb, 2986 stcb->asoc.primary_destination); 2987 #else 2988 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2989 SCTP_ADDR_NOT_LOCKED); 2990 #endif 2991 } 2992 } 2993 closed_socket: 2994 /* Toss the cookie if I can */ 2995 sctp_toss_old_cookies(stcb, asoc); 2996 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2997 /* Restart the timer if we have pending data */ 2998 struct sctp_tmit_chunk *chk; 2999 3000 chk = TAILQ_FIRST(&asoc->sent_queue); 3001 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3002 } 3003 } 3004 3005 static void 3006 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3007 struct sctp_tcb *stcb) 3008 { 3009 struct sctp_nets *net; 3010 struct sctp_tmit_chunk *lchk; 3011 struct sctp_ecne_chunk bkup; 3012 uint8_t override_bit; 3013 uint32_t tsn, window_data_tsn; 3014 int len; 3015 unsigned int pkt_cnt; 3016 3017 len = ntohs(cp->ch.chunk_length); 3018 if ((len != sizeof(struct sctp_ecne_chunk)) && 3019 (len != sizeof(struct old_sctp_ecne_chunk))) { 3020 return; 3021 } 3022 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3023 /* Its the old format */ 3024 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3025 bkup.num_pkts_since_cwr = htonl(1); 3026 cp = &bkup; 3027 } 3028 SCTP_STAT_INCR(sctps_recvecne); 3029 tsn = ntohl(cp->tsn); 3030 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3031 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3032 if (lchk == NULL) { 3033 window_data_tsn = stcb->asoc.sending_seq - 1; 3034 } else { 3035 window_data_tsn = lchk->rec.data.TSN_seq; 3036 } 3037 3038 /* Find where it was sent to if possible. */ 3039 net = NULL; 3040 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3041 if (lchk->rec.data.TSN_seq == tsn) { 3042 net = lchk->whoTo; 3043 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3044 break; 3045 } 3046 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3047 break; 3048 } 3049 } 3050 if (net == NULL) { 3051 /* 3052 * What to do. A previous send of a CWR was possibly lost. 3053 * See how old it is, we may have it marked on the actual 3054 * net. 3055 */ 3056 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3057 if (tsn == net->last_cwr_tsn) { 3058 /* Found him, send it off */ 3059 break; 3060 } 3061 } 3062 if (net == NULL) { 3063 /* 3064 * If we reach here, we need to send a special CWR 3065 * that says hey, we did this a long time ago and 3066 * you lost the response. 3067 */ 3068 net = TAILQ_FIRST(&stcb->asoc.nets); 3069 if (net == NULL) { 3070 /* TSNH */ 3071 return; 3072 } 3073 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3074 } else { 3075 override_bit = 0; 3076 } 3077 } else { 3078 override_bit = 0; 3079 } 3080 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3081 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3082 /* 3083 * JRS - Use the congestion control given in the pluggable 3084 * CC module 3085 */ 3086 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3087 /* 3088 * We reduce once every RTT. So we will only lower cwnd at 3089 * the next sending seq i.e. the window_data_tsn 3090 */ 3091 net->cwr_window_tsn = window_data_tsn; 3092 net->ecn_ce_pkt_cnt += pkt_cnt; 3093 net->lost_cnt = pkt_cnt; 3094 net->last_cwr_tsn = tsn; 3095 } else { 3096 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3097 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3098 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3099 /* 3100 * Another loss in the same window update how many 3101 * marks/packets lost we have had. 3102 */ 3103 int cnt = 1; 3104 3105 if (pkt_cnt > net->lost_cnt) { 3106 /* Should be the case */ 3107 cnt = (pkt_cnt - net->lost_cnt); 3108 net->ecn_ce_pkt_cnt += cnt; 3109 } 3110 net->lost_cnt = pkt_cnt; 3111 net->last_cwr_tsn = tsn; 3112 /* 3113 * Most CC functions will ignore this call, since we 3114 * are in-window yet of the initial CE the peer saw. 3115 */ 3116 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3117 } 3118 } 3119 /* 3120 * We always send a CWR this way if our previous one was lost our 3121 * peer will get an update, or if it is not time again to reduce we 3122 * still get the cwr to the peer. Note we set the override when we 3123 * could not find the TSN on the chunk or the destination network. 3124 */ 3125 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3126 } 3127 3128 static void 3129 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3130 { 3131 /* 3132 * Here we get a CWR from the peer. We must look in the outqueue and 3133 * make sure that we have a covered ECNE in the control chunk part. 3134 * If so remove it. 3135 */ 3136 struct sctp_tmit_chunk *chk; 3137 struct sctp_ecne_chunk *ecne; 3138 int override; 3139 uint32_t cwr_tsn; 3140 3141 cwr_tsn = ntohl(cp->tsn); 3142 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3143 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3144 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3145 continue; 3146 } 3147 if ((override == 0) && (chk->whoTo != net)) { 3148 /* Must be from the right src unless override is set */ 3149 continue; 3150 } 3151 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3152 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3153 /* this covers this ECNE, we can remove it */ 3154 stcb->asoc.ecn_echo_cnt_onq--; 3155 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3156 sctp_next); 3157 sctp_m_freem(chk->data); 3158 chk->data = NULL; 3159 stcb->asoc.ctrl_queue_cnt--; 3160 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3161 if (override == 0) { 3162 break; 3163 } 3164 } 3165 } 3166 } 3167 3168 static void 3169 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3170 struct sctp_tcb *stcb, struct sctp_nets *net) 3171 { 3172 struct sctp_association *asoc; 3173 3174 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3175 struct socket *so; 3176 3177 #endif 3178 3179 SCTPDBG(SCTP_DEBUG_INPUT2, 3180 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3181 if (stcb == NULL) 3182 return; 3183 3184 asoc = &stcb->asoc; 3185 /* process according to association state */ 3186 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3187 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3188 SCTPDBG(SCTP_DEBUG_INPUT2, 3189 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3190 SCTP_TCB_UNLOCK(stcb); 3191 return; 3192 } 3193 /* notify upper layer protocol */ 3194 if (stcb->sctp_socket) { 3195 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3196 } 3197 #ifdef INVARIANTS 3198 if (!TAILQ_EMPTY(&asoc->send_queue) || 3199 !TAILQ_EMPTY(&asoc->sent_queue) || 3200 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3201 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3202 } 3203 #endif 3204 /* stop the timer */ 3205 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3206 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3207 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3208 /* free the TCB */ 3209 SCTPDBG(SCTP_DEBUG_INPUT2, 3210 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3212 so = SCTP_INP_SO(stcb->sctp_ep); 3213 atomic_add_int(&stcb->asoc.refcnt, 1); 3214 SCTP_TCB_UNLOCK(stcb); 3215 SCTP_SOCKET_LOCK(so, 1); 3216 SCTP_TCB_LOCK(stcb); 3217 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3218 #endif 3219 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3220 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3221 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3222 SCTP_SOCKET_UNLOCK(so, 1); 3223 #endif 3224 return; 3225 } 3226 3227 static int 3228 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3229 struct sctp_nets *net, uint8_t flg) 3230 { 3231 switch (desc->chunk_type) { 3232 case SCTP_DATA: 3233 /* find the tsn to resend (possibly */ 3234 { 3235 uint32_t tsn; 3236 struct sctp_tmit_chunk *tp1; 3237 3238 tsn = ntohl(desc->tsn_ifany); 3239 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3240 if (tp1->rec.data.TSN_seq == tsn) { 3241 /* found it */ 3242 break; 3243 } 3244 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3245 /* not found */ 3246 tp1 = NULL; 3247 break; 3248 } 3249 } 3250 if (tp1 == NULL) { 3251 /* 3252 * Do it the other way , aka without paying 3253 * attention to queue seq order. 3254 */ 3255 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3256 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3257 if (tp1->rec.data.TSN_seq == tsn) { 3258 /* found it */ 3259 break; 3260 } 3261 } 3262 } 3263 if (tp1 == NULL) { 3264 SCTP_STAT_INCR(sctps_pdrptsnnf); 3265 } 3266 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3267 uint8_t *ddp; 3268 3269 if (((flg & SCTP_BADCRC) == 0) && 3270 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3271 return (0); 3272 } 3273 if ((stcb->asoc.peers_rwnd == 0) && 3274 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3275 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3276 return (0); 3277 } 3278 if (stcb->asoc.peers_rwnd == 0 && 3279 (flg & SCTP_FROM_MIDDLE_BOX)) { 3280 SCTP_STAT_INCR(sctps_pdrpdizrw); 3281 return (0); 3282 } 3283 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3284 sizeof(struct sctp_data_chunk)); 3285 { 3286 unsigned int iii; 3287 3288 for (iii = 0; iii < sizeof(desc->data_bytes); 3289 iii++) { 3290 if (ddp[iii] != desc->data_bytes[iii]) { 3291 SCTP_STAT_INCR(sctps_pdrpbadd); 3292 return (-1); 3293 } 3294 } 3295 } 3296 3297 if (tp1->do_rtt) { 3298 /* 3299 * this guy had a RTO calculation 3300 * pending on it, cancel it 3301 */ 3302 if (tp1->whoTo->rto_needed == 0) { 3303 tp1->whoTo->rto_needed = 1; 3304 } 3305 tp1->do_rtt = 0; 3306 } 3307 SCTP_STAT_INCR(sctps_pdrpmark); 3308 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3309 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3310 /* 3311 * mark it as if we were doing a FR, since 3312 * we will be getting gap ack reports behind 3313 * the info from the router. 3314 */ 3315 tp1->rec.data.doing_fast_retransmit = 1; 3316 /* 3317 * mark the tsn with what sequences can 3318 * cause a new FR. 3319 */ 3320 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3321 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3322 } else { 3323 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3324 } 3325 3326 /* restart the timer */ 3327 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3328 stcb, tp1->whoTo, 3329 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3330 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3331 stcb, tp1->whoTo); 3332 3333 /* fix counts and things */ 3334 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3335 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3336 tp1->whoTo->flight_size, 3337 tp1->book_size, 3338 (uintptr_t) stcb, 3339 tp1->rec.data.TSN_seq); 3340 } 3341 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3342 sctp_flight_size_decrease(tp1); 3343 sctp_total_flight_decrease(stcb, tp1); 3344 } 3345 tp1->sent = SCTP_DATAGRAM_RESEND; 3346 } { 3347 /* audit code */ 3348 unsigned int audit; 3349 3350 audit = 0; 3351 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3352 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3353 audit++; 3354 } 3355 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3356 sctp_next) { 3357 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3358 audit++; 3359 } 3360 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3361 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3362 audit, stcb->asoc.sent_queue_retran_cnt); 3363 #ifndef SCTP_AUDITING_ENABLED 3364 stcb->asoc.sent_queue_retran_cnt = audit; 3365 #endif 3366 } 3367 } 3368 } 3369 break; 3370 case SCTP_ASCONF: 3371 { 3372 struct sctp_tmit_chunk *asconf; 3373 3374 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3375 sctp_next) { 3376 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3377 break; 3378 } 3379 } 3380 if (asconf) { 3381 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3382 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3383 asconf->sent = SCTP_DATAGRAM_RESEND; 3384 asconf->snd_count--; 3385 } 3386 } 3387 break; 3388 case SCTP_INITIATION: 3389 /* resend the INIT */ 3390 stcb->asoc.dropped_special_cnt++; 3391 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3392 /* 3393 * If we can get it in, in a few attempts we do 3394 * this, otherwise we let the timer fire. 3395 */ 3396 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3397 stcb, net, 3398 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3399 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3400 } 3401 break; 3402 case SCTP_SELECTIVE_ACK: 3403 case SCTP_NR_SELECTIVE_ACK: 3404 /* resend the sack */ 3405 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3406 break; 3407 case SCTP_HEARTBEAT_REQUEST: 3408 /* resend a demand HB */ 3409 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3410 /* 3411 * Only retransmit if we KNOW we wont destroy the 3412 * tcb 3413 */ 3414 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3415 } 3416 break; 3417 case SCTP_SHUTDOWN: 3418 sctp_send_shutdown(stcb, net); 3419 break; 3420 case SCTP_SHUTDOWN_ACK: 3421 sctp_send_shutdown_ack(stcb, net); 3422 break; 3423 case SCTP_COOKIE_ECHO: 3424 { 3425 struct sctp_tmit_chunk *cookie; 3426 3427 cookie = NULL; 3428 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3429 sctp_next) { 3430 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3431 break; 3432 } 3433 } 3434 if (cookie) { 3435 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3436 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3437 cookie->sent = SCTP_DATAGRAM_RESEND; 3438 sctp_stop_all_cookie_timers(stcb); 3439 } 3440 } 3441 break; 3442 case SCTP_COOKIE_ACK: 3443 sctp_send_cookie_ack(stcb); 3444 break; 3445 case SCTP_ASCONF_ACK: 3446 /* resend last asconf ack */ 3447 sctp_send_asconf_ack(stcb); 3448 break; 3449 case SCTP_FORWARD_CUM_TSN: 3450 send_forward_tsn(stcb, &stcb->asoc); 3451 break; 3452 /* can't do anything with these */ 3453 case SCTP_PACKET_DROPPED: 3454 case SCTP_INITIATION_ACK: /* this should not happen */ 3455 case SCTP_HEARTBEAT_ACK: 3456 case SCTP_ABORT_ASSOCIATION: 3457 case SCTP_OPERATION_ERROR: 3458 case SCTP_SHUTDOWN_COMPLETE: 3459 case SCTP_ECN_ECHO: 3460 case SCTP_ECN_CWR: 3461 default: 3462 break; 3463 } 3464 return (0); 3465 } 3466 3467 void 3468 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3469 { 3470 uint32_t i; 3471 uint16_t temp; 3472 3473 /* 3474 * We set things to 0xffff since this is the last delivered sequence 3475 * and we will be sending in 0 after the reset. 3476 */ 3477 3478 if (number_entries) { 3479 for (i = 0; i < number_entries; i++) { 3480 temp = ntohs(list[i]); 3481 if (temp >= stcb->asoc.streamincnt) { 3482 continue; 3483 } 3484 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3485 } 3486 } else { 3487 list = NULL; 3488 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3489 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3490 } 3491 } 3492 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3493 } 3494 3495 static void 3496 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3497 { 3498 uint32_t i; 3499 uint16_t temp; 3500 3501 if (number_entries > 0) { 3502 for (i = 0; i < number_entries; i++) { 3503 temp = ntohs(list[i]); 3504 if (temp >= stcb->asoc.streamoutcnt) { 3505 /* no such stream */ 3506 continue; 3507 } 3508 stcb->asoc.strmout[temp].next_sequence_send = 0; 3509 } 3510 } else { 3511 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3512 stcb->asoc.strmout[i].next_sequence_send = 0; 3513 } 3514 } 3515 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3516 } 3517 3518 static void 3519 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3520 { 3521 uint32_t i; 3522 uint16_t temp; 3523 3524 if (number_entries > 0) { 3525 for (i = 0; i < number_entries; i++) { 3526 temp = ntohs(list[i]); 3527 if (temp >= stcb->asoc.streamoutcnt) { 3528 /* no such stream */ 3529 continue; 3530 } 3531 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3532 } 3533 } else { 3534 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3535 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3536 } 3537 } 3538 } 3539 3540 3541 struct sctp_stream_reset_request * 3542 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3543 { 3544 struct sctp_association *asoc; 3545 struct sctp_chunkhdr *ch; 3546 struct sctp_stream_reset_request *r; 3547 struct sctp_tmit_chunk *chk; 3548 int len, clen; 3549 3550 asoc = &stcb->asoc; 3551 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3552 asoc->stream_reset_outstanding = 0; 3553 return (NULL); 3554 } 3555 if (stcb->asoc.str_reset == NULL) { 3556 asoc->stream_reset_outstanding = 0; 3557 return (NULL); 3558 } 3559 chk = stcb->asoc.str_reset; 3560 if (chk->data == NULL) { 3561 return (NULL); 3562 } 3563 if (bchk) { 3564 /* he wants a copy of the chk pointer */ 3565 *bchk = chk; 3566 } 3567 clen = chk->send_size; 3568 ch = mtod(chk->data, struct sctp_chunkhdr *); 3569 r = (struct sctp_stream_reset_request *)(ch + 1); 3570 if (ntohl(r->request_seq) == seq) { 3571 /* found it */ 3572 return (r); 3573 } 3574 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3575 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3576 /* move to the next one, there can only be a max of two */ 3577 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3578 if (ntohl(r->request_seq) == seq) { 3579 return (r); 3580 } 3581 } 3582 /* that seq is not here */ 3583 return (NULL); 3584 } 3585 3586 static void 3587 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3588 { 3589 struct sctp_association *asoc; 3590 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3591 3592 if (stcb->asoc.str_reset == NULL) { 3593 return; 3594 } 3595 asoc = &stcb->asoc; 3596 3597 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3598 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3599 TAILQ_REMOVE(&asoc->control_send_queue, 3600 chk, 3601 sctp_next); 3602 if (chk->data) { 3603 sctp_m_freem(chk->data); 3604 chk->data = NULL; 3605 } 3606 asoc->ctrl_queue_cnt--; 3607 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3608 /* sa_ignore NO_NULL_CHK */ 3609 stcb->asoc.str_reset = NULL; 3610 } 3611 3612 3613 static int 3614 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3615 uint32_t seq, uint32_t action, 3616 struct sctp_stream_reset_response *respin) 3617 { 3618 uint16_t type; 3619 int lparm_len; 3620 struct sctp_association *asoc = &stcb->asoc; 3621 struct sctp_tmit_chunk *chk; 3622 struct sctp_stream_reset_request *req_param; 3623 struct sctp_stream_reset_out_request *req_out_param; 3624 struct sctp_stream_reset_in_request *req_in_param; 3625 uint32_t number_entries; 3626 3627 if (asoc->stream_reset_outstanding == 0) { 3628 /* duplicate */ 3629 return (0); 3630 } 3631 if (seq == stcb->asoc.str_reset_seq_out) { 3632 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3633 if (req_param != NULL) { 3634 stcb->asoc.str_reset_seq_out++; 3635 type = ntohs(req_param->ph.param_type); 3636 lparm_len = ntohs(req_param->ph.param_length); 3637 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3638 int no_clear = 0; 3639 3640 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3641 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3642 asoc->stream_reset_out_is_outstanding = 0; 3643 if (asoc->stream_reset_outstanding) 3644 asoc->stream_reset_outstanding--; 3645 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3646 /* do it */ 3647 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3648 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3649 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3650 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3651 /* 3652 * Set it up so we don't stop 3653 * retransmitting 3654 */ 3655 asoc->stream_reset_outstanding++; 3656 stcb->asoc.str_reset_seq_out--; 3657 asoc->stream_reset_out_is_outstanding = 1; 3658 no_clear = 1; 3659 } else { 3660 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3661 } 3662 if (no_clear == 0) { 3663 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3664 } 3665 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3666 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3667 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3668 if (asoc->stream_reset_outstanding) 3669 asoc->stream_reset_outstanding--; 3670 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3671 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3672 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3673 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3674 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3675 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3676 } 3677 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3678 /* Ok we now may have more streams */ 3679 int num_stream; 3680 3681 num_stream = stcb->asoc.strm_pending_add_size; 3682 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3683 /* TSNH */ 3684 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3685 } 3686 stcb->asoc.strm_pending_add_size = 0; 3687 if (asoc->stream_reset_outstanding) 3688 asoc->stream_reset_outstanding--; 3689 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3690 /* Put the new streams into effect */ 3691 int i; 3692 3693 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3694 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3695 } 3696 asoc->streamoutcnt += num_stream; 3697 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3698 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3699 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3700 SCTP_STREAM_CHANGE_DENIED); 3701 } else { 3702 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3703 SCTP_STREAM_CHANGE_FAILED); 3704 } 3705 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3706 if (asoc->stream_reset_outstanding) 3707 asoc->stream_reset_outstanding--; 3708 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3709 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3710 SCTP_STREAM_CHANGE_DENIED); 3711 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3712 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3713 SCTP_STREAM_CHANGE_FAILED); 3714 } 3715 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3716 /** 3717 * a) Adopt the new in tsn. 3718 * b) reset the map 3719 * c) Adopt the new out-tsn 3720 */ 3721 struct sctp_stream_reset_response_tsn *resp; 3722 struct sctp_forward_tsn_chunk fwdtsn; 3723 int abort_flag = 0; 3724 3725 if (respin == NULL) { 3726 /* huh ? */ 3727 return (0); 3728 } 3729 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3730 return (0); 3731 } 3732 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3733 resp = (struct sctp_stream_reset_response_tsn *)respin; 3734 asoc->stream_reset_outstanding--; 3735 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3736 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3737 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3738 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3739 if (abort_flag) { 3740 return (1); 3741 } 3742 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3743 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3744 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3745 } 3746 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3747 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3748 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3749 3750 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3751 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3752 3753 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3754 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3755 3756 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3757 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3758 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3759 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3760 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3761 SCTP_ASSOC_RESET_DENIED); 3762 } else { 3763 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3764 SCTP_ASSOC_RESET_FAILED); 3765 } 3766 } 3767 /* get rid of the request and get the request flags */ 3768 if (asoc->stream_reset_outstanding == 0) { 3769 sctp_clean_up_stream_reset(stcb); 3770 } 3771 } 3772 } 3773 if (asoc->stream_reset_outstanding == 0) { 3774 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3775 } 3776 return (0); 3777 } 3778 3779 static void 3780 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3781 struct sctp_tmit_chunk *chk, 3782 struct sctp_stream_reset_in_request *req, int trunc) 3783 { 3784 uint32_t seq; 3785 int len, i; 3786 int number_entries; 3787 uint16_t temp; 3788 3789 /* 3790 * peer wants me to send a str-reset to him for my outgoing seq's if 3791 * seq_in is right. 3792 */ 3793 struct sctp_association *asoc = &stcb->asoc; 3794 3795 seq = ntohl(req->request_seq); 3796 if (asoc->str_reset_seq_in == seq) { 3797 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3798 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3799 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3800 } else if (trunc) { 3801 /* Can't do it, since they exceeded our buffer size */ 3802 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3803 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3804 len = ntohs(req->ph.param_length); 3805 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3806 if (number_entries) { 3807 for (i = 0; i < number_entries; i++) { 3808 temp = ntohs(req->list_of_streams[i]); 3809 if (temp >= stcb->asoc.streamoutcnt) { 3810 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3811 goto bad_boy; 3812 } 3813 req->list_of_streams[i] = temp; 3814 } 3815 for (i = 0; i < number_entries; i++) { 3816 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3817 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3818 } 3819 } 3820 } else { 3821 /* Its all */ 3822 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3823 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3824 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3825 } 3826 } 3827 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3828 } else { 3829 /* Can't do it, since we have sent one out */ 3830 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3831 } 3832 bad_boy: 3833 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3834 asoc->str_reset_seq_in++; 3835 } else if (asoc->str_reset_seq_in - 1 == seq) { 3836 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3837 } else if (asoc->str_reset_seq_in - 2 == seq) { 3838 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3839 } else { 3840 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3841 } 3842 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3843 } 3844 3845 static int 3846 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3847 struct sctp_tmit_chunk *chk, 3848 struct sctp_stream_reset_tsn_request *req) 3849 { 3850 /* reset all in and out and update the tsn */ 3851 /* 3852 * A) reset my str-seq's on in and out. B) Select a receive next, 3853 * and set cum-ack to it. Also process this selected number as a 3854 * fwd-tsn as well. C) set in the response my next sending seq. 3855 */ 3856 struct sctp_forward_tsn_chunk fwdtsn; 3857 struct sctp_association *asoc = &stcb->asoc; 3858 int abort_flag = 0; 3859 uint32_t seq; 3860 3861 seq = ntohl(req->request_seq); 3862 if (asoc->str_reset_seq_in == seq) { 3863 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3864 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3865 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3866 } else { 3867 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3868 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3869 fwdtsn.ch.chunk_flags = 0; 3870 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3871 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3872 if (abort_flag) { 3873 return (1); 3874 } 3875 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3876 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3877 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3878 } 3879 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3880 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3881 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3882 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3883 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3884 atomic_add_int(&asoc->sending_seq, 1); 3885 /* save off historical data for retrans */ 3886 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3887 asoc->last_sending_seq[0] = asoc->sending_seq; 3888 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3889 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3890 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3891 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3892 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3893 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3894 } 3895 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3896 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3897 asoc->str_reset_seq_in++; 3898 } else if (asoc->str_reset_seq_in - 1 == seq) { 3899 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3900 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3901 } else if (asoc->str_reset_seq_in - 2 == seq) { 3902 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3903 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3904 } else { 3905 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3906 } 3907 return (0); 3908 } 3909 3910 static void 3911 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3912 struct sctp_tmit_chunk *chk, 3913 struct sctp_stream_reset_out_request *req, int trunc) 3914 { 3915 uint32_t seq, tsn; 3916 int number_entries, len; 3917 struct sctp_association *asoc = &stcb->asoc; 3918 3919 seq = ntohl(req->request_seq); 3920 3921 /* now if its not a duplicate we process it */ 3922 if (asoc->str_reset_seq_in == seq) { 3923 len = ntohs(req->ph.param_length); 3924 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3925 /* 3926 * the sender is resetting, handle the list issue.. we must 3927 * a) verify if we can do the reset, if so no problem b) If 3928 * we can't do the reset we must copy the request. c) queue 3929 * it, and setup the data in processor to trigger it off 3930 * when needed and dequeue all the queued data. 3931 */ 3932 tsn = ntohl(req->send_reset_at_tsn); 3933 3934 /* move the reset action back one */ 3935 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3936 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3937 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3938 } else if (trunc) { 3939 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3940 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3941 /* we can do it now */ 3942 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3943 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3944 } else { 3945 /* 3946 * we must queue it up and thus wait for the TSN's 3947 * to arrive that are at or before tsn 3948 */ 3949 struct sctp_stream_reset_list *liste; 3950 int siz; 3951 3952 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3953 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3954 siz, SCTP_M_STRESET); 3955 if (liste == NULL) { 3956 /* gak out of memory */ 3957 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3958 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3959 return; 3960 } 3961 liste->seq = seq; 3962 liste->tsn = tsn; 3963 liste->number_entries = number_entries; 3964 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3965 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3966 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3967 } 3968 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3969 asoc->str_reset_seq_in++; 3970 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3971 /* 3972 * one seq back, just echo back last action since my 3973 * response was lost. 3974 */ 3975 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3976 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3977 /* 3978 * two seq back, just echo back last action since my 3979 * response was lost. 3980 */ 3981 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3982 } else { 3983 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3984 } 3985 } 3986 3987 static void 3988 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3989 struct sctp_stream_reset_add_strm *str_add) 3990 { 3991 /* 3992 * Peer is requesting to add more streams. If its within our 3993 * max-streams we will allow it. 3994 */ 3995 uint32_t num_stream, i; 3996 uint32_t seq; 3997 struct sctp_association *asoc = &stcb->asoc; 3998 struct sctp_queued_to_read *ctl, *nctl; 3999 4000 /* Get the number. */ 4001 seq = ntohl(str_add->request_seq); 4002 num_stream = ntohs(str_add->number_of_streams); 4003 /* Now what would be the new total? */ 4004 if (asoc->str_reset_seq_in == seq) { 4005 num_stream += stcb->asoc.streamincnt; 4006 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4007 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4008 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4009 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4010 (num_stream > 0xffff)) { 4011 /* We must reject it they ask for to many */ 4012 denied: 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4014 } else { 4015 /* Ok, we can do that :-) */ 4016 struct sctp_stream_in *oldstrm; 4017 4018 /* save off the old */ 4019 oldstrm = stcb->asoc.strmin; 4020 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4021 (num_stream * sizeof(struct sctp_stream_in)), 4022 SCTP_M_STRMI); 4023 if (stcb->asoc.strmin == NULL) { 4024 stcb->asoc.strmin = oldstrm; 4025 goto denied; 4026 } 4027 /* copy off the old data */ 4028 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4029 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4030 stcb->asoc.strmin[i].stream_no = i; 4031 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4032 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4033 /* now anything on those queues? */ 4034 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4035 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4036 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4037 } 4038 } 4039 /* Init the new streams */ 4040 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4041 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4042 stcb->asoc.strmin[i].stream_no = i; 4043 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4044 stcb->asoc.strmin[i].delivery_started = 0; 4045 } 4046 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4047 /* update the size */ 4048 stcb->asoc.streamincnt = num_stream; 4049 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4050 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4051 } 4052 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4053 asoc->str_reset_seq_in++; 4054 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4055 /* 4056 * one seq back, just echo back last action since my 4057 * response was lost. 4058 */ 4059 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4060 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4061 /* 4062 * two seq back, just echo back last action since my 4063 * response was lost. 4064 */ 4065 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4066 } else { 4067 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4068 4069 } 4070 } 4071 4072 static void 4073 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4074 struct sctp_stream_reset_add_strm *str_add) 4075 { 4076 /* 4077 * Peer is requesting to add more streams. If its within our 4078 * max-streams we will allow it. 4079 */ 4080 uint16_t num_stream; 4081 uint32_t seq; 4082 struct sctp_association *asoc = &stcb->asoc; 4083 4084 /* Get the number. */ 4085 seq = ntohl(str_add->request_seq); 4086 num_stream = ntohs(str_add->number_of_streams); 4087 /* Now what would be the new total? */ 4088 if (asoc->str_reset_seq_in == seq) { 4089 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4090 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4091 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4092 } else if (stcb->asoc.stream_reset_outstanding) { 4093 /* We must reject it we have something pending */ 4094 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4095 } else { 4096 /* Ok, we can do that :-) */ 4097 int mychk; 4098 4099 mychk = stcb->asoc.streamoutcnt; 4100 mychk += num_stream; 4101 if (mychk < 0x10000) { 4102 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4103 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4104 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4105 } 4106 } else { 4107 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4108 } 4109 } 4110 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4111 asoc->str_reset_seq_in++; 4112 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4113 /* 4114 * one seq back, just echo back last action since my 4115 * response was lost. 4116 */ 4117 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4118 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4119 /* 4120 * two seq back, just echo back last action since my 4121 * response was lost. 4122 */ 4123 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4124 } else { 4125 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4126 } 4127 } 4128 4129 #ifdef __GNUC__ 4130 __attribute__((noinline)) 4131 #endif 4132 static int 4133 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4134 struct sctp_chunkhdr *ch_req) 4135 { 4136 uint16_t remaining_length, param_len, ptype; 4137 struct sctp_paramhdr pstore; 4138 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4139 uint32_t seq = 0; 4140 int num_req = 0; 4141 int trunc = 0; 4142 struct sctp_tmit_chunk *chk; 4143 struct sctp_chunkhdr *ch; 4144 struct sctp_paramhdr *ph; 4145 int ret_code = 0; 4146 int num_param = 0; 4147 4148 /* now it may be a reset or a reset-response */ 4149 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4150 4151 /* setup for adding the response */ 4152 sctp_alloc_a_chunk(stcb, chk); 4153 if (chk == NULL) { 4154 return (ret_code); 4155 } 4156 chk->copy_by_ref = 0; 4157 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4158 chk->rec.chunk_id.can_take_data = 0; 4159 chk->flags = 0; 4160 chk->asoc = &stcb->asoc; 4161 chk->no_fr_allowed = 0; 4162 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4163 chk->book_size_scale = 0; 4164 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4165 if (chk->data == NULL) { 4166 strres_nochunk: 4167 if (chk->data) { 4168 sctp_m_freem(chk->data); 4169 chk->data = NULL; 4170 } 4171 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4172 return (ret_code); 4173 } 4174 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4175 4176 /* setup chunk parameters */ 4177 chk->sent = SCTP_DATAGRAM_UNSENT; 4178 chk->snd_count = 0; 4179 chk->whoTo = NULL; 4180 4181 ch = mtod(chk->data, struct sctp_chunkhdr *); 4182 ch->chunk_type = SCTP_STREAM_RESET; 4183 ch->chunk_flags = 0; 4184 ch->chunk_length = htons(chk->send_size); 4185 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4186 offset += sizeof(struct sctp_chunkhdr); 4187 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4188 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4189 if (ph == NULL) { 4190 /* TSNH */ 4191 break; 4192 } 4193 param_len = ntohs(ph->param_length); 4194 if ((param_len > remaining_length) || 4195 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4196 /* bad parameter length */ 4197 break; 4198 } 4199 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4200 (uint8_t *) & cstore); 4201 if (ph == NULL) { 4202 /* TSNH */ 4203 break; 4204 } 4205 ptype = ntohs(ph->param_type); 4206 num_param++; 4207 if (param_len > sizeof(cstore)) { 4208 trunc = 1; 4209 } else { 4210 trunc = 0; 4211 } 4212 if (num_param > SCTP_MAX_RESET_PARAMS) { 4213 /* hit the max of parameters already sorry.. */ 4214 break; 4215 } 4216 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4217 struct sctp_stream_reset_out_request *req_out; 4218 4219 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4220 break; 4221 } 4222 req_out = (struct sctp_stream_reset_out_request *)ph; 4223 num_req++; 4224 if (stcb->asoc.stream_reset_outstanding) { 4225 seq = ntohl(req_out->response_seq); 4226 if (seq == stcb->asoc.str_reset_seq_out) { 4227 /* implicit ack */ 4228 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4229 } 4230 } 4231 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4232 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4233 struct sctp_stream_reset_add_strm *str_add; 4234 4235 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4236 break; 4237 } 4238 str_add = (struct sctp_stream_reset_add_strm *)ph; 4239 num_req++; 4240 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4241 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4242 struct sctp_stream_reset_add_strm *str_add; 4243 4244 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4245 break; 4246 } 4247 str_add = (struct sctp_stream_reset_add_strm *)ph; 4248 num_req++; 4249 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4250 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4251 struct sctp_stream_reset_in_request *req_in; 4252 4253 num_req++; 4254 req_in = (struct sctp_stream_reset_in_request *)ph; 4255 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4256 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4257 struct sctp_stream_reset_tsn_request *req_tsn; 4258 4259 num_req++; 4260 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4261 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4262 ret_code = 1; 4263 goto strres_nochunk; 4264 } 4265 /* no more */ 4266 break; 4267 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4268 struct sctp_stream_reset_response *resp; 4269 uint32_t result; 4270 4271 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4272 break; 4273 } 4274 resp = (struct sctp_stream_reset_response *)ph; 4275 seq = ntohl(resp->response_seq); 4276 result = ntohl(resp->result); 4277 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4278 ret_code = 1; 4279 goto strres_nochunk; 4280 } 4281 } else { 4282 break; 4283 } 4284 offset += SCTP_SIZE32(param_len); 4285 if (remaining_length >= SCTP_SIZE32(param_len)) { 4286 remaining_length -= SCTP_SIZE32(param_len); 4287 } else { 4288 remaining_length = 0; 4289 } 4290 } 4291 if (num_req == 0) { 4292 /* we have no response free the stuff */ 4293 goto strres_nochunk; 4294 } 4295 /* ok we have a chunk to link in */ 4296 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4297 chk, 4298 sctp_next); 4299 stcb->asoc.ctrl_queue_cnt++; 4300 return (ret_code); 4301 } 4302 4303 /* 4304 * Handle a router or endpoints report of a packet loss, there are two ways 4305 * to handle this, either we get the whole packet and must disect it 4306 * ourselves (possibly with truncation and or corruption) or it is a summary 4307 * from a middle box that did the disectting for us. 4308 */ 4309 static void 4310 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4311 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4312 { 4313 uint32_t bottle_bw, on_queue; 4314 uint16_t trunc_len; 4315 unsigned int chlen; 4316 unsigned int at; 4317 struct sctp_chunk_desc desc; 4318 struct sctp_chunkhdr *ch; 4319 4320 chlen = ntohs(cp->ch.chunk_length); 4321 chlen -= sizeof(struct sctp_pktdrop_chunk); 4322 /* XXX possible chlen underflow */ 4323 if (chlen == 0) { 4324 ch = NULL; 4325 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4326 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4327 } else { 4328 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4329 chlen -= sizeof(struct sctphdr); 4330 /* XXX possible chlen underflow */ 4331 memset(&desc, 0, sizeof(desc)); 4332 } 4333 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4334 if (trunc_len > limit) { 4335 trunc_len = limit; 4336 } 4337 /* now the chunks themselves */ 4338 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4339 desc.chunk_type = ch->chunk_type; 4340 /* get amount we need to move */ 4341 at = ntohs(ch->chunk_length); 4342 if (at < sizeof(struct sctp_chunkhdr)) { 4343 /* corrupt chunk, maybe at the end? */ 4344 SCTP_STAT_INCR(sctps_pdrpcrupt); 4345 break; 4346 } 4347 if (trunc_len == 0) { 4348 /* we are supposed to have all of it */ 4349 if (at > chlen) { 4350 /* corrupt skip it */ 4351 SCTP_STAT_INCR(sctps_pdrpcrupt); 4352 break; 4353 } 4354 } else { 4355 /* is there enough of it left ? */ 4356 if (desc.chunk_type == SCTP_DATA) { 4357 if (chlen < (sizeof(struct sctp_data_chunk) + 4358 sizeof(desc.data_bytes))) { 4359 break; 4360 } 4361 } else { 4362 if (chlen < sizeof(struct sctp_chunkhdr)) { 4363 break; 4364 } 4365 } 4366 } 4367 if (desc.chunk_type == SCTP_DATA) { 4368 /* can we get out the tsn? */ 4369 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4370 SCTP_STAT_INCR(sctps_pdrpmbda); 4371 4372 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4373 /* yep */ 4374 struct sctp_data_chunk *dcp; 4375 uint8_t *ddp; 4376 unsigned int iii; 4377 4378 dcp = (struct sctp_data_chunk *)ch; 4379 ddp = (uint8_t *) (dcp + 1); 4380 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4381 desc.data_bytes[iii] = ddp[iii]; 4382 } 4383 desc.tsn_ifany = dcp->dp.tsn; 4384 } else { 4385 /* nope we are done. */ 4386 SCTP_STAT_INCR(sctps_pdrpnedat); 4387 break; 4388 } 4389 } else { 4390 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4391 SCTP_STAT_INCR(sctps_pdrpmbct); 4392 } 4393 4394 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4395 SCTP_STAT_INCR(sctps_pdrppdbrk); 4396 break; 4397 } 4398 if (SCTP_SIZE32(at) > chlen) { 4399 break; 4400 } 4401 chlen -= SCTP_SIZE32(at); 4402 if (chlen < sizeof(struct sctp_chunkhdr)) { 4403 /* done, none left */ 4404 break; 4405 } 4406 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4407 } 4408 /* Now update any rwnd --- possibly */ 4409 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4410 /* From a peer, we get a rwnd report */ 4411 uint32_t a_rwnd; 4412 4413 SCTP_STAT_INCR(sctps_pdrpfehos); 4414 4415 bottle_bw = ntohl(cp->bottle_bw); 4416 on_queue = ntohl(cp->current_onq); 4417 if (bottle_bw && on_queue) { 4418 /* a rwnd report is in here */ 4419 if (bottle_bw > on_queue) 4420 a_rwnd = bottle_bw - on_queue; 4421 else 4422 a_rwnd = 0; 4423 4424 if (a_rwnd == 0) 4425 stcb->asoc.peers_rwnd = 0; 4426 else { 4427 if (a_rwnd > stcb->asoc.total_flight) { 4428 stcb->asoc.peers_rwnd = 4429 a_rwnd - stcb->asoc.total_flight; 4430 } else { 4431 stcb->asoc.peers_rwnd = 0; 4432 } 4433 if (stcb->asoc.peers_rwnd < 4434 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4435 /* SWS sender side engages */ 4436 stcb->asoc.peers_rwnd = 0; 4437 } 4438 } 4439 } 4440 } else { 4441 SCTP_STAT_INCR(sctps_pdrpfmbox); 4442 } 4443 4444 /* now middle boxes in sat networks get a cwnd bump */ 4445 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4446 (stcb->asoc.sat_t3_loss_recovery == 0) && 4447 (stcb->asoc.sat_network)) { 4448 /* 4449 * This is debateable but for sat networks it makes sense 4450 * Note if a T3 timer has went off, we will prohibit any 4451 * changes to cwnd until we exit the t3 loss recovery. 4452 */ 4453 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4454 net, cp, &bottle_bw, &on_queue); 4455 } 4456 } 4457 4458 /* 4459 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4460 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4461 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4462 * length of the complete packet outputs: - length: modified to remaining 4463 * length after control processing - netp: modified to new sctp_nets after 4464 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4465 * bad packet,...) otherwise return the tcb for this packet 4466 */ 4467 #ifdef __GNUC__ 4468 __attribute__((noinline)) 4469 #endif 4470 static struct sctp_tcb * 4471 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4472 struct sockaddr *src, struct sockaddr *dst, 4473 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4474 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4475 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4476 uint32_t vrf_id, uint16_t port) 4477 { 4478 struct sctp_association *asoc; 4479 struct mbuf *op_err; 4480 char msg[SCTP_DIAG_INFO_LEN]; 4481 uint32_t vtag_in; 4482 int num_chunks = 0; /* number of control chunks processed */ 4483 uint32_t chk_length; 4484 int ret; 4485 int abort_no_unlock = 0; 4486 int ecne_seen = 0; 4487 4488 /* 4489 * How big should this be, and should it be alloc'd? Lets try the 4490 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4491 * until we get into jumbo grams and such.. 4492 */ 4493 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4494 struct sctp_tcb *locked_tcb = stcb; 4495 int got_auth = 0; 4496 uint32_t auth_offset = 0, auth_len = 0; 4497 int auth_skipped = 0; 4498 int asconf_cnt = 0; 4499 4500 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4501 struct socket *so; 4502 4503 #endif 4504 4505 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4506 iphlen, *offset, length, (void *)stcb); 4507 4508 /* validate chunk header length... */ 4509 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4510 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4511 ntohs(ch->chunk_length)); 4512 if (locked_tcb) { 4513 SCTP_TCB_UNLOCK(locked_tcb); 4514 } 4515 return (NULL); 4516 } 4517 /* 4518 * validate the verification tag 4519 */ 4520 vtag_in = ntohl(sh->v_tag); 4521 4522 if (locked_tcb) { 4523 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4524 } 4525 if (ch->chunk_type == SCTP_INITIATION) { 4526 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4527 ntohs(ch->chunk_length), vtag_in); 4528 if (vtag_in != 0) { 4529 /* protocol error- silently discard... */ 4530 SCTP_STAT_INCR(sctps_badvtag); 4531 if (locked_tcb) { 4532 SCTP_TCB_UNLOCK(locked_tcb); 4533 } 4534 return (NULL); 4535 } 4536 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4537 /* 4538 * If there is no stcb, skip the AUTH chunk and process 4539 * later after a stcb is found (to validate the lookup was 4540 * valid. 4541 */ 4542 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4543 (stcb == NULL) && 4544 (inp->auth_supported == 1)) { 4545 /* save this chunk for later processing */ 4546 auth_skipped = 1; 4547 auth_offset = *offset; 4548 auth_len = ntohs(ch->chunk_length); 4549 4550 /* (temporarily) move past this chunk */ 4551 *offset += SCTP_SIZE32(auth_len); 4552 if (*offset >= length) { 4553 /* no more data left in the mbuf chain */ 4554 *offset = length; 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 return (NULL); 4559 } 4560 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4561 sizeof(struct sctp_chunkhdr), chunk_buf); 4562 } 4563 if (ch == NULL) { 4564 /* Help */ 4565 *offset = length; 4566 if (locked_tcb) { 4567 SCTP_TCB_UNLOCK(locked_tcb); 4568 } 4569 return (NULL); 4570 } 4571 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4572 goto process_control_chunks; 4573 } 4574 /* 4575 * first check if it's an ASCONF with an unknown src addr we 4576 * need to look inside to find the association 4577 */ 4578 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4579 struct sctp_chunkhdr *asconf_ch = ch; 4580 uint32_t asconf_offset = 0, asconf_len = 0; 4581 4582 /* inp's refcount may be reduced */ 4583 SCTP_INP_INCR_REF(inp); 4584 4585 asconf_offset = *offset; 4586 do { 4587 asconf_len = ntohs(asconf_ch->chunk_length); 4588 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4589 break; 4590 stcb = sctp_findassociation_ep_asconf(m, 4591 *offset, 4592 dst, 4593 sh, &inp, netp, vrf_id); 4594 if (stcb != NULL) 4595 break; 4596 asconf_offset += SCTP_SIZE32(asconf_len); 4597 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4598 sizeof(struct sctp_chunkhdr), chunk_buf); 4599 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4600 if (stcb == NULL) { 4601 /* 4602 * reduce inp's refcount if not reduced in 4603 * sctp_findassociation_ep_asconf(). 4604 */ 4605 SCTP_INP_DECR_REF(inp); 4606 } else { 4607 locked_tcb = stcb; 4608 } 4609 4610 /* now go back and verify any auth chunk to be sure */ 4611 if (auth_skipped && (stcb != NULL)) { 4612 struct sctp_auth_chunk *auth; 4613 4614 auth = (struct sctp_auth_chunk *) 4615 sctp_m_getptr(m, auth_offset, 4616 auth_len, chunk_buf); 4617 got_auth = 1; 4618 auth_skipped = 0; 4619 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4620 auth_offset)) { 4621 /* auth HMAC failed so dump it */ 4622 *offset = length; 4623 if (locked_tcb) { 4624 SCTP_TCB_UNLOCK(locked_tcb); 4625 } 4626 return (NULL); 4627 } else { 4628 /* remaining chunks are HMAC checked */ 4629 stcb->asoc.authenticated = 1; 4630 } 4631 } 4632 } 4633 if (stcb == NULL) { 4634 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4635 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4636 msg); 4637 /* no association, so it's out of the blue... */ 4638 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4639 mflowtype, mflowid, inp->fibnum, 4640 vrf_id, port); 4641 *offset = length; 4642 if (locked_tcb) { 4643 SCTP_TCB_UNLOCK(locked_tcb); 4644 } 4645 return (NULL); 4646 } 4647 asoc = &stcb->asoc; 4648 /* ABORT and SHUTDOWN can use either v_tag... */ 4649 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4650 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4651 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4652 /* Take the T-bit always into account. */ 4653 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4654 (vtag_in == asoc->my_vtag)) || 4655 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4656 (vtag_in == asoc->peer_vtag))) { 4657 /* this is valid */ 4658 } else { 4659 /* drop this packet... */ 4660 SCTP_STAT_INCR(sctps_badvtag); 4661 if (locked_tcb) { 4662 SCTP_TCB_UNLOCK(locked_tcb); 4663 } 4664 return (NULL); 4665 } 4666 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4667 if (vtag_in != asoc->my_vtag) { 4668 /* 4669 * this could be a stale SHUTDOWN-ACK or the 4670 * peer never got the SHUTDOWN-COMPLETE and 4671 * is still hung; we have started a new asoc 4672 * but it won't complete until the shutdown 4673 * is completed 4674 */ 4675 if (locked_tcb) { 4676 SCTP_TCB_UNLOCK(locked_tcb); 4677 } 4678 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4679 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4680 msg); 4681 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4682 sh, inp, op_err, 4683 mflowtype, mflowid, fibnum, 4684 vrf_id, port); 4685 return (NULL); 4686 } 4687 } else { 4688 /* for all other chunks, vtag must match */ 4689 if (vtag_in != asoc->my_vtag) { 4690 /* invalid vtag... */ 4691 SCTPDBG(SCTP_DEBUG_INPUT3, 4692 "invalid vtag: %xh, expect %xh\n", 4693 vtag_in, asoc->my_vtag); 4694 SCTP_STAT_INCR(sctps_badvtag); 4695 if (locked_tcb) { 4696 SCTP_TCB_UNLOCK(locked_tcb); 4697 } 4698 *offset = length; 4699 return (NULL); 4700 } 4701 } 4702 } /* end if !SCTP_COOKIE_ECHO */ 4703 /* 4704 * process all control chunks... 4705 */ 4706 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4707 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4708 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4709 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4710 /* implied cookie-ack.. we must have lost the ack */ 4711 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4712 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4713 stcb->asoc.overall_error_count, 4714 0, 4715 SCTP_FROM_SCTP_INPUT, 4716 __LINE__); 4717 } 4718 stcb->asoc.overall_error_count = 0; 4719 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4720 *netp); 4721 } 4722 process_control_chunks: 4723 while (IS_SCTP_CONTROL(ch)) { 4724 /* validate chunk length */ 4725 chk_length = ntohs(ch->chunk_length); 4726 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4727 ch->chunk_type, chk_length); 4728 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4729 if (chk_length < sizeof(*ch) || 4730 (*offset + (int)chk_length) > length) { 4731 *offset = length; 4732 if (locked_tcb) { 4733 SCTP_TCB_UNLOCK(locked_tcb); 4734 } 4735 return (NULL); 4736 } 4737 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4738 /* 4739 * INIT-ACK only gets the init ack "header" portion only 4740 * because we don't have to process the peer's COOKIE. All 4741 * others get a complete chunk. 4742 */ 4743 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4744 (ch->chunk_type == SCTP_INITIATION)) { 4745 /* get an init-ack chunk */ 4746 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4747 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4748 if (ch == NULL) { 4749 *offset = length; 4750 if (locked_tcb) { 4751 SCTP_TCB_UNLOCK(locked_tcb); 4752 } 4753 return (NULL); 4754 } 4755 } else { 4756 /* For cookies and all other chunks. */ 4757 if (chk_length > sizeof(chunk_buf)) { 4758 /* 4759 * use just the size of the chunk buffer so 4760 * the front part of our chunks fit in 4761 * contiguous space up to the chunk buffer 4762 * size (508 bytes). For chunks that need to 4763 * get more than that they must use the 4764 * sctp_m_getptr() function or other means 4765 * (e.g. know how to parse mbuf chains). 4766 * Cookies do this already. 4767 */ 4768 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4769 (sizeof(chunk_buf) - 4), 4770 chunk_buf); 4771 if (ch == NULL) { 4772 *offset = length; 4773 if (locked_tcb) { 4774 SCTP_TCB_UNLOCK(locked_tcb); 4775 } 4776 return (NULL); 4777 } 4778 } else { 4779 /* We can fit it all */ 4780 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4781 chk_length, chunk_buf); 4782 if (ch == NULL) { 4783 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4784 *offset = length; 4785 if (locked_tcb) { 4786 SCTP_TCB_UNLOCK(locked_tcb); 4787 } 4788 return (NULL); 4789 } 4790 } 4791 } 4792 num_chunks++; 4793 /* Save off the last place we got a control from */ 4794 if (stcb != NULL) { 4795 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4796 /* 4797 * allow last_control to be NULL if 4798 * ASCONF... ASCONF processing will find the 4799 * right net later 4800 */ 4801 if ((netp != NULL) && (*netp != NULL)) 4802 stcb->asoc.last_control_chunk_from = *netp; 4803 } 4804 } 4805 #ifdef SCTP_AUDITING_ENABLED 4806 sctp_audit_log(0xB0, ch->chunk_type); 4807 #endif 4808 4809 /* check to see if this chunk required auth, but isn't */ 4810 if ((stcb != NULL) && 4811 (stcb->asoc.auth_supported == 1) && 4812 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4813 !stcb->asoc.authenticated) { 4814 /* "silently" ignore */ 4815 SCTP_STAT_INCR(sctps_recvauthmissing); 4816 goto next_chunk; 4817 } 4818 switch (ch->chunk_type) { 4819 case SCTP_INITIATION: 4820 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4821 /* The INIT chunk must be the only chunk. */ 4822 if ((num_chunks > 1) || 4823 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4824 /* RFC 4960 requires that no ABORT is sent */ 4825 *offset = length; 4826 if (locked_tcb) { 4827 SCTP_TCB_UNLOCK(locked_tcb); 4828 } 4829 return (NULL); 4830 } 4831 /* Honor our resource limit. */ 4832 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4833 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4834 sctp_abort_association(inp, stcb, m, iphlen, 4835 src, dst, sh, op_err, 4836 mflowtype, mflowid, 4837 vrf_id, port); 4838 *offset = length; 4839 return (NULL); 4840 } 4841 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4842 (struct sctp_init_chunk *)ch, inp, 4843 stcb, *netp, &abort_no_unlock, 4844 mflowtype, mflowid, 4845 vrf_id, port); 4846 *offset = length; 4847 if ((!abort_no_unlock) && (locked_tcb)) { 4848 SCTP_TCB_UNLOCK(locked_tcb); 4849 } 4850 return (NULL); 4851 break; 4852 case SCTP_PAD_CHUNK: 4853 break; 4854 case SCTP_INITIATION_ACK: 4855 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4856 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4857 /* We are not interested anymore */ 4858 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4859 ; 4860 } else { 4861 if (locked_tcb != stcb) { 4862 /* Very unlikely */ 4863 SCTP_TCB_UNLOCK(locked_tcb); 4864 } 4865 *offset = length; 4866 if (stcb) { 4867 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4868 so = SCTP_INP_SO(inp); 4869 atomic_add_int(&stcb->asoc.refcnt, 1); 4870 SCTP_TCB_UNLOCK(stcb); 4871 SCTP_SOCKET_LOCK(so, 1); 4872 SCTP_TCB_LOCK(stcb); 4873 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4874 #endif 4875 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4876 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4878 SCTP_SOCKET_UNLOCK(so, 1); 4879 #endif 4880 } 4881 return (NULL); 4882 } 4883 } 4884 /* The INIT-ACK chunk must be the only chunk. */ 4885 if ((num_chunks > 1) || 4886 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4887 *offset = length; 4888 if (locked_tcb) { 4889 SCTP_TCB_UNLOCK(locked_tcb); 4890 } 4891 return (NULL); 4892 } 4893 if ((netp) && (*netp)) { 4894 ret = sctp_handle_init_ack(m, iphlen, *offset, 4895 src, dst, sh, 4896 (struct sctp_init_ack_chunk *)ch, 4897 stcb, *netp, 4898 &abort_no_unlock, 4899 mflowtype, mflowid, 4900 vrf_id); 4901 } else { 4902 ret = -1; 4903 } 4904 *offset = length; 4905 if (abort_no_unlock) { 4906 return (NULL); 4907 } 4908 /* 4909 * Special case, I must call the output routine to 4910 * get the cookie echoed 4911 */ 4912 if ((stcb != NULL) && (ret == 0)) { 4913 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4914 } 4915 if (locked_tcb) { 4916 SCTP_TCB_UNLOCK(locked_tcb); 4917 } 4918 return (NULL); 4919 break; 4920 case SCTP_SELECTIVE_ACK: 4921 { 4922 struct sctp_sack_chunk *sack; 4923 int abort_now = 0; 4924 uint32_t a_rwnd, cum_ack; 4925 uint16_t num_seg, num_dup; 4926 uint8_t flags; 4927 int offset_seg, offset_dup; 4928 4929 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4930 SCTP_STAT_INCR(sctps_recvsacks); 4931 if (stcb == NULL) { 4932 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4933 break; 4934 } 4935 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4936 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4937 break; 4938 } 4939 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4940 /*- 4941 * If we have sent a shutdown-ack, we will pay no 4942 * attention to a sack sent in to us since 4943 * we don't care anymore. 4944 */ 4945 break; 4946 } 4947 sack = (struct sctp_sack_chunk *)ch; 4948 flags = ch->chunk_flags; 4949 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4950 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4951 num_dup = ntohs(sack->sack.num_dup_tsns); 4952 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4953 if (sizeof(struct sctp_sack_chunk) + 4954 num_seg * sizeof(struct sctp_gap_ack_block) + 4955 num_dup * sizeof(uint32_t) != chk_length) { 4956 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4957 break; 4958 } 4959 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4960 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4961 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4962 cum_ack, num_seg, a_rwnd); 4963 stcb->asoc.seen_a_sack_this_pkt = 1; 4964 if ((stcb->asoc.pr_sctp_cnt == 0) && 4965 (num_seg == 0) && 4966 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4967 (stcb->asoc.saw_sack_with_frags == 0) && 4968 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4969 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4970 ) { 4971 /* 4972 * We have a SIMPLE sack having no 4973 * prior segments and data on sent 4974 * queue to be acked.. Use the 4975 * faster path sack processing. We 4976 * also allow window update sacks 4977 * with no missing segments to go 4978 * this way too. 4979 */ 4980 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4981 } else { 4982 if (netp && *netp) 4983 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4984 num_seg, 0, num_dup, &abort_now, flags, 4985 cum_ack, a_rwnd, ecne_seen); 4986 } 4987 if (abort_now) { 4988 /* ABORT signal from sack processing */ 4989 *offset = length; 4990 return (NULL); 4991 } 4992 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4993 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4994 (stcb->asoc.stream_queue_cnt == 0)) { 4995 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4996 } 4997 } 4998 break; 4999 /* 5000 * EY - nr_sack: If the received chunk is an 5001 * nr_sack chunk 5002 */ 5003 case SCTP_NR_SELECTIVE_ACK: 5004 { 5005 struct sctp_nr_sack_chunk *nr_sack; 5006 int abort_now = 0; 5007 uint32_t a_rwnd, cum_ack; 5008 uint16_t num_seg, num_nr_seg, num_dup; 5009 uint8_t flags; 5010 int offset_seg, offset_dup; 5011 5012 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5013 SCTP_STAT_INCR(sctps_recvsacks); 5014 if (stcb == NULL) { 5015 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5016 break; 5017 } 5018 if (stcb->asoc.nrsack_supported == 0) { 5019 goto unknown_chunk; 5020 } 5021 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5022 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5023 break; 5024 } 5025 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5026 /*- 5027 * If we have sent a shutdown-ack, we will pay no 5028 * attention to a sack sent in to us since 5029 * we don't care anymore. 5030 */ 5031 break; 5032 } 5033 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5034 flags = ch->chunk_flags; 5035 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5036 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5037 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5038 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5039 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5040 if (sizeof(struct sctp_nr_sack_chunk) + 5041 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5042 num_dup * sizeof(uint32_t) != chk_length) { 5043 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5044 break; 5045 } 5046 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5047 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5049 cum_ack, num_seg, a_rwnd); 5050 stcb->asoc.seen_a_sack_this_pkt = 1; 5051 if ((stcb->asoc.pr_sctp_cnt == 0) && 5052 (num_seg == 0) && (num_nr_seg == 0) && 5053 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5054 (stcb->asoc.saw_sack_with_frags == 0) && 5055 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5056 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5057 /* 5058 * We have a SIMPLE sack having no 5059 * prior segments and data on sent 5060 * queue to be acked. Use the faster 5061 * path sack processing. We also 5062 * allow window update sacks with no 5063 * missing segments to go this way 5064 * too. 5065 */ 5066 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5067 &abort_now, ecne_seen); 5068 } else { 5069 if (netp && *netp) 5070 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5071 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5072 cum_ack, a_rwnd, ecne_seen); 5073 } 5074 if (abort_now) { 5075 /* ABORT signal from sack processing */ 5076 *offset = length; 5077 return (NULL); 5078 } 5079 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5080 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5081 (stcb->asoc.stream_queue_cnt == 0)) { 5082 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5083 } 5084 } 5085 break; 5086 5087 case SCTP_HEARTBEAT_REQUEST: 5088 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5089 if ((stcb) && netp && *netp) { 5090 SCTP_STAT_INCR(sctps_recvheartbeat); 5091 sctp_send_heartbeat_ack(stcb, m, *offset, 5092 chk_length, *netp); 5093 5094 /* He's alive so give him credit */ 5095 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5096 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5097 stcb->asoc.overall_error_count, 5098 0, 5099 SCTP_FROM_SCTP_INPUT, 5100 __LINE__); 5101 } 5102 stcb->asoc.overall_error_count = 0; 5103 } 5104 break; 5105 case SCTP_HEARTBEAT_ACK: 5106 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5107 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5108 /* Its not ours */ 5109 *offset = length; 5110 if (locked_tcb) { 5111 SCTP_TCB_UNLOCK(locked_tcb); 5112 } 5113 return (NULL); 5114 } 5115 /* He's alive so give him credit */ 5116 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5117 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5118 stcb->asoc.overall_error_count, 5119 0, 5120 SCTP_FROM_SCTP_INPUT, 5121 __LINE__); 5122 } 5123 stcb->asoc.overall_error_count = 0; 5124 SCTP_STAT_INCR(sctps_recvheartbeatack); 5125 if (netp && *netp) 5126 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5127 stcb, *netp); 5128 break; 5129 case SCTP_ABORT_ASSOCIATION: 5130 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5131 (void *)stcb); 5132 if ((stcb) && netp && *netp) 5133 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5134 stcb, *netp); 5135 *offset = length; 5136 return (NULL); 5137 break; 5138 case SCTP_SHUTDOWN: 5139 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5140 (void *)stcb); 5141 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5142 *offset = length; 5143 if (locked_tcb) { 5144 SCTP_TCB_UNLOCK(locked_tcb); 5145 } 5146 return (NULL); 5147 } 5148 if (netp && *netp) { 5149 int abort_flag = 0; 5150 5151 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5152 stcb, *netp, &abort_flag); 5153 if (abort_flag) { 5154 *offset = length; 5155 return (NULL); 5156 } 5157 } 5158 break; 5159 case SCTP_SHUTDOWN_ACK: 5160 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5161 if ((stcb) && (netp) && (*netp)) 5162 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5163 *offset = length; 5164 return (NULL); 5165 break; 5166 5167 case SCTP_OPERATION_ERROR: 5168 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5169 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5170 *offset = length; 5171 return (NULL); 5172 } 5173 break; 5174 case SCTP_COOKIE_ECHO: 5175 SCTPDBG(SCTP_DEBUG_INPUT3, 5176 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5177 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5178 ; 5179 } else { 5180 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5181 /* We are not interested anymore */ 5182 abend: 5183 if (stcb) { 5184 SCTP_TCB_UNLOCK(stcb); 5185 } 5186 *offset = length; 5187 return (NULL); 5188 } 5189 } 5190 /* 5191 * First are we accepting? We do this again here 5192 * since it is possible that a previous endpoint WAS 5193 * listening responded to a INIT-ACK and then 5194 * closed. We opened and bound.. and are now no 5195 * longer listening. 5196 */ 5197 5198 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5199 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5200 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5201 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5202 sctp_abort_association(inp, stcb, m, iphlen, 5203 src, dst, sh, op_err, 5204 mflowtype, mflowid, 5205 vrf_id, port); 5206 } 5207 *offset = length; 5208 return (NULL); 5209 } else { 5210 struct mbuf *ret_buf; 5211 struct sctp_inpcb *linp; 5212 5213 if (stcb) { 5214 linp = NULL; 5215 } else { 5216 linp = inp; 5217 } 5218 5219 if (linp) { 5220 SCTP_ASOC_CREATE_LOCK(linp); 5221 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5222 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5223 SCTP_ASOC_CREATE_UNLOCK(linp); 5224 goto abend; 5225 } 5226 } 5227 if (netp) { 5228 ret_buf = 5229 sctp_handle_cookie_echo(m, iphlen, 5230 *offset, 5231 src, dst, 5232 sh, 5233 (struct sctp_cookie_echo_chunk *)ch, 5234 &inp, &stcb, netp, 5235 auth_skipped, 5236 auth_offset, 5237 auth_len, 5238 &locked_tcb, 5239 mflowtype, 5240 mflowid, 5241 vrf_id, 5242 port); 5243 } else { 5244 ret_buf = NULL; 5245 } 5246 if (linp) { 5247 SCTP_ASOC_CREATE_UNLOCK(linp); 5248 } 5249 if (ret_buf == NULL) { 5250 if (locked_tcb) { 5251 SCTP_TCB_UNLOCK(locked_tcb); 5252 } 5253 SCTPDBG(SCTP_DEBUG_INPUT3, 5254 "GAK, null buffer\n"); 5255 *offset = length; 5256 return (NULL); 5257 } 5258 /* if AUTH skipped, see if it verified... */ 5259 if (auth_skipped) { 5260 got_auth = 1; 5261 auth_skipped = 0; 5262 } 5263 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5264 /* 5265 * Restart the timer if we have 5266 * pending data 5267 */ 5268 struct sctp_tmit_chunk *chk; 5269 5270 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5271 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5272 } 5273 } 5274 break; 5275 case SCTP_COOKIE_ACK: 5276 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5277 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5278 if (locked_tcb) { 5279 SCTP_TCB_UNLOCK(locked_tcb); 5280 } 5281 return (NULL); 5282 } 5283 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5284 /* We are not interested anymore */ 5285 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5286 ; 5287 } else if (stcb) { 5288 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5289 so = SCTP_INP_SO(inp); 5290 atomic_add_int(&stcb->asoc.refcnt, 1); 5291 SCTP_TCB_UNLOCK(stcb); 5292 SCTP_SOCKET_LOCK(so, 1); 5293 SCTP_TCB_LOCK(stcb); 5294 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5295 #endif 5296 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5297 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5299 SCTP_SOCKET_UNLOCK(so, 1); 5300 #endif 5301 *offset = length; 5302 return (NULL); 5303 } 5304 } 5305 /* He's alive so give him credit */ 5306 if ((stcb) && netp && *netp) { 5307 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5308 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5309 stcb->asoc.overall_error_count, 5310 0, 5311 SCTP_FROM_SCTP_INPUT, 5312 __LINE__); 5313 } 5314 stcb->asoc.overall_error_count = 0; 5315 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5316 } 5317 break; 5318 case SCTP_ECN_ECHO: 5319 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5320 /* He's alive so give him credit */ 5321 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5322 /* Its not ours */ 5323 if (locked_tcb) { 5324 SCTP_TCB_UNLOCK(locked_tcb); 5325 } 5326 *offset = length; 5327 return (NULL); 5328 } 5329 if (stcb) { 5330 if (stcb->asoc.ecn_supported == 0) { 5331 goto unknown_chunk; 5332 } 5333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5334 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5335 stcb->asoc.overall_error_count, 5336 0, 5337 SCTP_FROM_SCTP_INPUT, 5338 __LINE__); 5339 } 5340 stcb->asoc.overall_error_count = 0; 5341 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5342 stcb); 5343 ecne_seen = 1; 5344 } 5345 break; 5346 case SCTP_ECN_CWR: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5348 /* He's alive so give him credit */ 5349 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5350 /* Its not ours */ 5351 if (locked_tcb) { 5352 SCTP_TCB_UNLOCK(locked_tcb); 5353 } 5354 *offset = length; 5355 return (NULL); 5356 } 5357 if (stcb) { 5358 if (stcb->asoc.ecn_supported == 0) { 5359 goto unknown_chunk; 5360 } 5361 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5362 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5363 stcb->asoc.overall_error_count, 5364 0, 5365 SCTP_FROM_SCTP_INPUT, 5366 __LINE__); 5367 } 5368 stcb->asoc.overall_error_count = 0; 5369 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5370 } 5371 break; 5372 case SCTP_SHUTDOWN_COMPLETE: 5373 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5374 /* must be first and only chunk */ 5375 if ((num_chunks > 1) || 5376 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5377 *offset = length; 5378 if (locked_tcb) { 5379 SCTP_TCB_UNLOCK(locked_tcb); 5380 } 5381 return (NULL); 5382 } 5383 if ((stcb) && netp && *netp) { 5384 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5385 stcb, *netp); 5386 } 5387 *offset = length; 5388 return (NULL); 5389 break; 5390 case SCTP_ASCONF: 5391 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5392 /* He's alive so give him credit */ 5393 if (stcb) { 5394 if (stcb->asoc.asconf_supported == 0) { 5395 goto unknown_chunk; 5396 } 5397 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5398 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5399 stcb->asoc.overall_error_count, 5400 0, 5401 SCTP_FROM_SCTP_INPUT, 5402 __LINE__); 5403 } 5404 stcb->asoc.overall_error_count = 0; 5405 sctp_handle_asconf(m, *offset, src, 5406 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5407 asconf_cnt++; 5408 } 5409 break; 5410 case SCTP_ASCONF_ACK: 5411 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5412 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5413 /* Its not ours */ 5414 if (locked_tcb) { 5415 SCTP_TCB_UNLOCK(locked_tcb); 5416 } 5417 *offset = length; 5418 return (NULL); 5419 } 5420 if ((stcb) && netp && *netp) { 5421 if (stcb->asoc.asconf_supported == 0) { 5422 goto unknown_chunk; 5423 } 5424 /* He's alive so give him credit */ 5425 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5426 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5427 stcb->asoc.overall_error_count, 5428 0, 5429 SCTP_FROM_SCTP_INPUT, 5430 __LINE__); 5431 } 5432 stcb->asoc.overall_error_count = 0; 5433 sctp_handle_asconf_ack(m, *offset, 5434 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5435 if (abort_no_unlock) 5436 return (NULL); 5437 } 5438 break; 5439 case SCTP_FORWARD_CUM_TSN: 5440 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5441 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5442 /* Its not ours */ 5443 if (locked_tcb) { 5444 SCTP_TCB_UNLOCK(locked_tcb); 5445 } 5446 *offset = length; 5447 return (NULL); 5448 } 5449 /* He's alive so give him credit */ 5450 if (stcb) { 5451 int abort_flag = 0; 5452 5453 if (stcb->asoc.prsctp_supported == 0) { 5454 goto unknown_chunk; 5455 } 5456 stcb->asoc.overall_error_count = 0; 5457 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5458 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5459 stcb->asoc.overall_error_count, 5460 0, 5461 SCTP_FROM_SCTP_INPUT, 5462 __LINE__); 5463 } 5464 *fwd_tsn_seen = 1; 5465 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5466 /* We are not interested anymore */ 5467 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5468 so = SCTP_INP_SO(inp); 5469 atomic_add_int(&stcb->asoc.refcnt, 1); 5470 SCTP_TCB_UNLOCK(stcb); 5471 SCTP_SOCKET_LOCK(so, 1); 5472 SCTP_TCB_LOCK(stcb); 5473 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5474 #endif 5475 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5476 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5477 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5478 SCTP_SOCKET_UNLOCK(so, 1); 5479 #endif 5480 *offset = length; 5481 return (NULL); 5482 } 5483 sctp_handle_forward_tsn(stcb, 5484 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5485 if (abort_flag) { 5486 *offset = length; 5487 return (NULL); 5488 } else { 5489 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5490 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5491 stcb->asoc.overall_error_count, 5492 0, 5493 SCTP_FROM_SCTP_INPUT, 5494 __LINE__); 5495 } 5496 stcb->asoc.overall_error_count = 0; 5497 } 5498 5499 } 5500 break; 5501 case SCTP_STREAM_RESET: 5502 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5503 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5504 /* Its not ours */ 5505 if (locked_tcb) { 5506 SCTP_TCB_UNLOCK(locked_tcb); 5507 } 5508 *offset = length; 5509 return (NULL); 5510 } 5511 if (stcb->asoc.reconfig_supported == 0) { 5512 goto unknown_chunk; 5513 } 5514 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5515 /* stop processing */ 5516 *offset = length; 5517 return (NULL); 5518 } 5519 break; 5520 case SCTP_PACKET_DROPPED: 5521 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5522 /* re-get it all please */ 5523 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5524 /* Its not ours */ 5525 if (locked_tcb) { 5526 SCTP_TCB_UNLOCK(locked_tcb); 5527 } 5528 *offset = length; 5529 return (NULL); 5530 } 5531 if (ch && (stcb) && netp && (*netp)) { 5532 if (stcb->asoc.pktdrop_supported == 0) { 5533 goto unknown_chunk; 5534 } 5535 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5536 stcb, *netp, 5537 min(chk_length, (sizeof(chunk_buf) - 4))); 5538 5539 } 5540 break; 5541 case SCTP_AUTHENTICATION: 5542 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5543 if (stcb == NULL) { 5544 /* save the first AUTH for later processing */ 5545 if (auth_skipped == 0) { 5546 auth_offset = *offset; 5547 auth_len = chk_length; 5548 auth_skipped = 1; 5549 } 5550 /* skip this chunk (temporarily) */ 5551 goto next_chunk; 5552 } 5553 if (stcb->asoc.auth_supported == 0) { 5554 goto unknown_chunk; 5555 } 5556 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5557 (chk_length > (sizeof(struct sctp_auth_chunk) + 5558 SCTP_AUTH_DIGEST_LEN_MAX))) { 5559 /* Its not ours */ 5560 if (locked_tcb) { 5561 SCTP_TCB_UNLOCK(locked_tcb); 5562 } 5563 *offset = length; 5564 return (NULL); 5565 } 5566 if (got_auth == 1) { 5567 /* skip this chunk... it's already auth'd */ 5568 goto next_chunk; 5569 } 5570 got_auth = 1; 5571 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5572 m, *offset)) { 5573 /* auth HMAC failed so dump the packet */ 5574 *offset = length; 5575 return (stcb); 5576 } else { 5577 /* remaining chunks are HMAC checked */ 5578 stcb->asoc.authenticated = 1; 5579 } 5580 break; 5581 5582 default: 5583 unknown_chunk: 5584 /* it's an unknown chunk! */ 5585 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5586 struct sctp_gen_error_cause *cause; 5587 int len; 5588 5589 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5590 0, M_NOWAIT, 1, MT_DATA); 5591 if (op_err != NULL) { 5592 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5593 cause = mtod(op_err, struct sctp_gen_error_cause *); 5594 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5595 cause->length = htons(len + sizeof(struct sctp_gen_error_cause)); 5596 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5597 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5598 if (SCTP_BUF_NEXT(op_err) != NULL) { 5599 #ifdef SCTP_MBUF_LOGGING 5600 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5601 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5602 } 5603 #endif 5604 sctp_queue_op_err(stcb, op_err); 5605 } else { 5606 sctp_m_freem(op_err); 5607 } 5608 } 5609 } 5610 if ((ch->chunk_type & 0x80) == 0) { 5611 /* discard this packet */ 5612 *offset = length; 5613 return (stcb); 5614 } /* else skip this bad chunk and continue... */ 5615 break; 5616 } /* switch (ch->chunk_type) */ 5617 5618 5619 next_chunk: 5620 /* get the next chunk */ 5621 *offset += SCTP_SIZE32(chk_length); 5622 if (*offset >= length) { 5623 /* no more data left in the mbuf chain */ 5624 break; 5625 } 5626 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5627 sizeof(struct sctp_chunkhdr), chunk_buf); 5628 if (ch == NULL) { 5629 if (locked_tcb) { 5630 SCTP_TCB_UNLOCK(locked_tcb); 5631 } 5632 *offset = length; 5633 return (NULL); 5634 } 5635 } /* while */ 5636 5637 if (asconf_cnt > 0 && stcb != NULL) { 5638 sctp_send_asconf_ack(stcb); 5639 } 5640 return (stcb); 5641 } 5642 5643 5644 /* 5645 * common input chunk processing (v4 and v6) 5646 */ 5647 void 5648 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5649 struct sockaddr *src, struct sockaddr *dst, 5650 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5651 #if !defined(SCTP_WITH_NO_CSUM) 5652 uint8_t compute_crc, 5653 #endif 5654 uint8_t ecn_bits, 5655 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5656 uint32_t vrf_id, uint16_t port) 5657 { 5658 uint32_t high_tsn; 5659 int fwd_tsn_seen = 0, data_processed = 0; 5660 struct mbuf *m = *mm, *op_err; 5661 char msg[SCTP_DIAG_INFO_LEN]; 5662 int un_sent; 5663 int cnt_ctrl_ready = 0; 5664 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5665 struct sctp_tcb *stcb = NULL; 5666 struct sctp_nets *net = NULL; 5667 5668 SCTP_STAT_INCR(sctps_recvdatagrams); 5669 #ifdef SCTP_AUDITING_ENABLED 5670 sctp_audit_log(0xE0, 1); 5671 sctp_auditing(0, inp, stcb, net); 5672 #endif 5673 #if !defined(SCTP_WITH_NO_CSUM) 5674 if (compute_crc != 0) { 5675 uint32_t check, calc_check; 5676 5677 check = sh->checksum; 5678 sh->checksum = 0; 5679 calc_check = sctp_calculate_cksum(m, iphlen); 5680 sh->checksum = check; 5681 if (calc_check != check) { 5682 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5683 calc_check, check, (void *)m, length, iphlen); 5684 stcb = sctp_findassociation_addr(m, offset, src, dst, 5685 sh, ch, &inp, &net, vrf_id); 5686 #if defined(INET) || defined(INET6) 5687 if ((ch->chunk_type != SCTP_INITIATION) && 5688 (net != NULL) && (net->port != port)) { 5689 if (net->port == 0) { 5690 /* UDP encapsulation turned on. */ 5691 net->mtu -= sizeof(struct udphdr); 5692 if (stcb->asoc.smallest_mtu > net->mtu) { 5693 sctp_pathmtu_adjustment(stcb, net->mtu); 5694 } 5695 } else if (port == 0) { 5696 /* UDP encapsulation turned off. */ 5697 net->mtu += sizeof(struct udphdr); 5698 /* XXX Update smallest_mtu */ 5699 } 5700 net->port = port; 5701 } 5702 #endif 5703 if (net != NULL) { 5704 net->flowtype = mflowtype; 5705 net->flowid = mflowid; 5706 } 5707 if ((inp != NULL) && (stcb != NULL)) { 5708 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5709 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5710 } else if ((inp != NULL) && (stcb == NULL)) { 5711 inp_decr = inp; 5712 } 5713 SCTP_STAT_INCR(sctps_badsum); 5714 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5715 goto out; 5716 } 5717 } 5718 #endif 5719 /* Destination port of 0 is illegal, based on RFC4960. */ 5720 if (sh->dest_port == 0) { 5721 SCTP_STAT_INCR(sctps_hdrops); 5722 goto out; 5723 } 5724 stcb = sctp_findassociation_addr(m, offset, src, dst, 5725 sh, ch, &inp, &net, vrf_id); 5726 #if defined(INET) || defined(INET6) 5727 if ((ch->chunk_type != SCTP_INITIATION) && 5728 (net != NULL) && (net->port != port)) { 5729 if (net->port == 0) { 5730 /* UDP encapsulation turned on. */ 5731 net->mtu -= sizeof(struct udphdr); 5732 if (stcb->asoc.smallest_mtu > net->mtu) { 5733 sctp_pathmtu_adjustment(stcb, net->mtu); 5734 } 5735 } else if (port == 0) { 5736 /* UDP encapsulation turned off. */ 5737 net->mtu += sizeof(struct udphdr); 5738 /* XXX Update smallest_mtu */ 5739 } 5740 net->port = port; 5741 } 5742 #endif 5743 if (net != NULL) { 5744 net->flowtype = mflowtype; 5745 net->flowid = mflowid; 5746 } 5747 if (inp == NULL) { 5748 SCTP_STAT_INCR(sctps_noport); 5749 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5750 goto out; 5751 } 5752 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5753 sctp_send_shutdown_complete2(src, dst, sh, 5754 mflowtype, mflowid, fibnum, 5755 vrf_id, port); 5756 goto out; 5757 } 5758 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5759 goto out; 5760 } 5761 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5762 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5763 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5764 (ch->chunk_type != SCTP_INIT))) { 5765 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5766 "Out of the blue"); 5767 sctp_send_abort(m, iphlen, src, dst, 5768 sh, 0, op_err, 5769 mflowtype, mflowid, fibnum, 5770 vrf_id, port); 5771 } 5772 } 5773 goto out; 5774 } else if (stcb == NULL) { 5775 inp_decr = inp; 5776 } 5777 #ifdef IPSEC 5778 /*- 5779 * I very much doubt any of the IPSEC stuff will work but I have no 5780 * idea, so I will leave it in place. 5781 */ 5782 if (inp != NULL) { 5783 switch (dst->sa_family) { 5784 #ifdef INET 5785 case AF_INET: 5786 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5787 SCTP_STAT_INCR(sctps_hdrops); 5788 goto out; 5789 } 5790 break; 5791 #endif 5792 #ifdef INET6 5793 case AF_INET6: 5794 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5795 SCTP_STAT_INCR(sctps_hdrops); 5796 goto out; 5797 } 5798 break; 5799 #endif 5800 default: 5801 break; 5802 } 5803 } 5804 #endif 5805 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5806 (void *)m, iphlen, offset, length, (void *)stcb); 5807 if (stcb) { 5808 /* always clear this before beginning a packet */ 5809 stcb->asoc.authenticated = 0; 5810 stcb->asoc.seen_a_sack_this_pkt = 0; 5811 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5812 (void *)stcb, stcb->asoc.state); 5813 5814 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5815 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5816 /*- 5817 * If we hit here, we had a ref count 5818 * up when the assoc was aborted and the 5819 * timer is clearing out the assoc, we should 5820 * NOT respond to any packet.. its OOTB. 5821 */ 5822 SCTP_TCB_UNLOCK(stcb); 5823 stcb = NULL; 5824 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5825 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5826 msg); 5827 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5828 mflowtype, mflowid, inp->fibnum, 5829 vrf_id, port); 5830 goto out; 5831 } 5832 } 5833 if (IS_SCTP_CONTROL(ch)) { 5834 /* process the control portion of the SCTP packet */ 5835 /* sa_ignore NO_NULL_CHK */ 5836 stcb = sctp_process_control(m, iphlen, &offset, length, 5837 src, dst, sh, ch, 5838 inp, stcb, &net, &fwd_tsn_seen, 5839 mflowtype, mflowid, fibnum, 5840 vrf_id, port); 5841 if (stcb) { 5842 /* 5843 * This covers us if the cookie-echo was there and 5844 * it changes our INP. 5845 */ 5846 inp = stcb->sctp_ep; 5847 #if defined(INET) || defined(INET6) 5848 if ((ch->chunk_type != SCTP_INITIATION) && 5849 (net != NULL) && (net->port != port)) { 5850 if (net->port == 0) { 5851 /* UDP encapsulation turned on. */ 5852 net->mtu -= sizeof(struct udphdr); 5853 if (stcb->asoc.smallest_mtu > net->mtu) { 5854 sctp_pathmtu_adjustment(stcb, net->mtu); 5855 } 5856 } else if (port == 0) { 5857 /* UDP encapsulation turned off. */ 5858 net->mtu += sizeof(struct udphdr); 5859 /* XXX Update smallest_mtu */ 5860 } 5861 net->port = port; 5862 } 5863 #endif 5864 } 5865 } else { 5866 /* 5867 * no control chunks, so pre-process DATA chunks (these 5868 * checks are taken care of by control processing) 5869 */ 5870 5871 /* 5872 * if DATA only packet, and auth is required, then punt... 5873 * can't have authenticated without any AUTH (control) 5874 * chunks 5875 */ 5876 if ((stcb != NULL) && 5877 (stcb->asoc.auth_supported == 1) && 5878 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5879 /* "silently" ignore */ 5880 SCTP_STAT_INCR(sctps_recvauthmissing); 5881 goto out; 5882 } 5883 if (stcb == NULL) { 5884 /* out of the blue DATA chunk */ 5885 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5886 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5887 msg); 5888 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5889 mflowtype, mflowid, fibnum, 5890 vrf_id, port); 5891 goto out; 5892 } 5893 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5894 /* v_tag mismatch! */ 5895 SCTP_STAT_INCR(sctps_badvtag); 5896 goto out; 5897 } 5898 } 5899 5900 if (stcb == NULL) { 5901 /* 5902 * no valid TCB for this packet, or we found it's a bad 5903 * packet while processing control, or we're done with this 5904 * packet (done or skip rest of data), so we drop it... 5905 */ 5906 goto out; 5907 } 5908 /* 5909 * DATA chunk processing 5910 */ 5911 /* plow through the data chunks while length > offset */ 5912 5913 /* 5914 * Rest should be DATA only. Check authentication state if AUTH for 5915 * DATA is required. 5916 */ 5917 if ((length > offset) && 5918 (stcb != NULL) && 5919 (stcb->asoc.auth_supported == 1) && 5920 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5921 !stcb->asoc.authenticated) { 5922 /* "silently" ignore */ 5923 SCTP_STAT_INCR(sctps_recvauthmissing); 5924 SCTPDBG(SCTP_DEBUG_AUTH1, 5925 "Data chunk requires AUTH, skipped\n"); 5926 goto trigger_send; 5927 } 5928 if (length > offset) { 5929 int retval; 5930 5931 /* 5932 * First check to make sure our state is correct. We would 5933 * not get here unless we really did have a tag, so we don't 5934 * abort if this happens, just dump the chunk silently. 5935 */ 5936 switch (SCTP_GET_STATE(&stcb->asoc)) { 5937 case SCTP_STATE_COOKIE_ECHOED: 5938 /* 5939 * we consider data with valid tags in this state 5940 * shows us the cookie-ack was lost. Imply it was 5941 * there. 5942 */ 5943 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5944 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5945 stcb->asoc.overall_error_count, 5946 0, 5947 SCTP_FROM_SCTP_INPUT, 5948 __LINE__); 5949 } 5950 stcb->asoc.overall_error_count = 0; 5951 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5952 break; 5953 case SCTP_STATE_COOKIE_WAIT: 5954 /* 5955 * We consider OOTB any data sent during asoc setup. 5956 */ 5957 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5958 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5959 msg); 5960 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5961 mflowtype, mflowid, inp->fibnum, 5962 vrf_id, port); 5963 goto out; 5964 /* sa_ignore NOTREACHED */ 5965 break; 5966 case SCTP_STATE_EMPTY: /* should not happen */ 5967 case SCTP_STATE_INUSE: /* should not happen */ 5968 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5969 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5970 default: 5971 goto out; 5972 /* sa_ignore NOTREACHED */ 5973 break; 5974 case SCTP_STATE_OPEN: 5975 case SCTP_STATE_SHUTDOWN_SENT: 5976 break; 5977 } 5978 /* plow through the data chunks while length > offset */ 5979 retval = sctp_process_data(mm, iphlen, &offset, length, 5980 inp, stcb, net, &high_tsn); 5981 if (retval == 2) { 5982 /* 5983 * The association aborted, NO UNLOCK needed since 5984 * the association is destroyed. 5985 */ 5986 stcb = NULL; 5987 goto out; 5988 } 5989 data_processed = 1; 5990 /* 5991 * Anything important needs to have been m_copy'ed in 5992 * process_data 5993 */ 5994 } 5995 /* take care of ecn */ 5996 if ((data_processed == 1) && 5997 (stcb->asoc.ecn_supported == 1) && 5998 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5999 /* Yep, we need to add a ECNE */ 6000 sctp_send_ecn_echo(stcb, net, high_tsn); 6001 } 6002 if ((data_processed == 0) && (fwd_tsn_seen)) { 6003 int was_a_gap; 6004 uint32_t highest_tsn; 6005 6006 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6007 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6008 } else { 6009 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6010 } 6011 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6012 stcb->asoc.send_sack = 1; 6013 sctp_sack_check(stcb, was_a_gap); 6014 } else if (fwd_tsn_seen) { 6015 stcb->asoc.send_sack = 1; 6016 } 6017 /* trigger send of any chunks in queue... */ 6018 trigger_send: 6019 #ifdef SCTP_AUDITING_ENABLED 6020 sctp_audit_log(0xE0, 2); 6021 sctp_auditing(1, inp, stcb, net); 6022 #endif 6023 SCTPDBG(SCTP_DEBUG_INPUT1, 6024 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6025 stcb->asoc.peers_rwnd, 6026 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6027 stcb->asoc.total_flight); 6028 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6029 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6030 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6031 } 6032 if (cnt_ctrl_ready || stcb->asoc.trigger_reset || 6033 ((un_sent) && 6034 (stcb->asoc.peers_rwnd > 0 || 6035 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6036 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6037 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6038 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6039 } 6040 #ifdef SCTP_AUDITING_ENABLED 6041 sctp_audit_log(0xE0, 3); 6042 sctp_auditing(2, inp, stcb, net); 6043 #endif 6044 out: 6045 if (stcb != NULL) { 6046 SCTP_TCB_UNLOCK(stcb); 6047 } 6048 if (inp_decr != NULL) { 6049 /* reduce ref-count */ 6050 SCTP_INP_WLOCK(inp_decr); 6051 SCTP_INP_DECR_REF(inp_decr); 6052 SCTP_INP_WUNLOCK(inp_decr); 6053 } 6054 return; 6055 } 6056 6057 #ifdef INET 6058 void 6059 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6060 { 6061 struct mbuf *m; 6062 int iphlen; 6063 uint32_t vrf_id = 0; 6064 uint8_t ecn_bits; 6065 struct sockaddr_in src, dst; 6066 struct ip *ip; 6067 struct sctphdr *sh; 6068 struct sctp_chunkhdr *ch; 6069 int length, offset; 6070 6071 #if !defined(SCTP_WITH_NO_CSUM) 6072 uint8_t compute_crc; 6073 6074 #endif 6075 uint32_t mflowid; 6076 uint8_t mflowtype; 6077 uint16_t fibnum; 6078 6079 iphlen = off; 6080 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6081 SCTP_RELEASE_PKT(i_pak); 6082 return; 6083 } 6084 m = SCTP_HEADER_TO_CHAIN(i_pak); 6085 #ifdef SCTP_MBUF_LOGGING 6086 /* Log in any input mbufs */ 6087 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6088 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6089 } 6090 #endif 6091 #ifdef SCTP_PACKET_LOGGING 6092 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6093 sctp_packet_log(m); 6094 } 6095 #endif 6096 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6097 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6098 m->m_pkthdr.len, 6099 if_name(m->m_pkthdr.rcvif), 6100 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6101 mflowid = m->m_pkthdr.flowid; 6102 mflowtype = M_HASHTYPE_GET(m); 6103 fibnum = M_GETFIB(m); 6104 SCTP_STAT_INCR(sctps_recvpackets); 6105 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6106 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6107 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6108 if (SCTP_BUF_LEN(m) < offset) { 6109 if ((m = m_pullup(m, offset)) == NULL) { 6110 SCTP_STAT_INCR(sctps_hdrops); 6111 return; 6112 } 6113 } 6114 ip = mtod(m, struct ip *); 6115 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6116 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6117 offset -= sizeof(struct sctp_chunkhdr); 6118 memset(&src, 0, sizeof(struct sockaddr_in)); 6119 src.sin_family = AF_INET; 6120 src.sin_len = sizeof(struct sockaddr_in); 6121 src.sin_port = sh->src_port; 6122 src.sin_addr = ip->ip_src; 6123 memset(&dst, 0, sizeof(struct sockaddr_in)); 6124 dst.sin_family = AF_INET; 6125 dst.sin_len = sizeof(struct sockaddr_in); 6126 dst.sin_port = sh->dest_port; 6127 dst.sin_addr = ip->ip_dst; 6128 length = ntohs(ip->ip_len); 6129 /* Validate mbuf chain length with IP payload length. */ 6130 if (SCTP_HEADER_LEN(m) != length) { 6131 SCTPDBG(SCTP_DEBUG_INPUT1, 6132 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6133 SCTP_STAT_INCR(sctps_hdrops); 6134 goto out; 6135 } 6136 /* SCTP does not allow broadcasts or multicasts */ 6137 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6138 goto out; 6139 } 6140 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6141 goto out; 6142 } 6143 ecn_bits = ip->ip_tos; 6144 #if defined(SCTP_WITH_NO_CSUM) 6145 SCTP_STAT_INCR(sctps_recvnocrc); 6146 #else 6147 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6148 SCTP_STAT_INCR(sctps_recvhwcrc); 6149 compute_crc = 0; 6150 } else { 6151 SCTP_STAT_INCR(sctps_recvswcrc); 6152 compute_crc = 1; 6153 } 6154 #endif 6155 sctp_common_input_processing(&m, iphlen, offset, length, 6156 (struct sockaddr *)&src, 6157 (struct sockaddr *)&dst, 6158 sh, ch, 6159 #if !defined(SCTP_WITH_NO_CSUM) 6160 compute_crc, 6161 #endif 6162 ecn_bits, 6163 mflowtype, mflowid, fibnum, 6164 vrf_id, port); 6165 out: 6166 if (m) { 6167 sctp_m_freem(m); 6168 } 6169 return; 6170 } 6171 6172 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6173 extern int *sctp_cpuarry; 6174 6175 #endif 6176 6177 int 6178 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6179 { 6180 struct mbuf *m; 6181 int off; 6182 6183 m = *mp; 6184 off = *offp; 6185 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6186 if (mp_ncpus > 1) { 6187 struct ip *ip; 6188 struct sctphdr *sh; 6189 int offset; 6190 int cpu_to_use; 6191 uint32_t flowid, tag; 6192 6193 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6194 flowid = m->m_pkthdr.flowid; 6195 } else { 6196 /* 6197 * No flow id built by lower layers fix it so we 6198 * create one. 6199 */ 6200 offset = off + sizeof(struct sctphdr); 6201 if (SCTP_BUF_LEN(m) < offset) { 6202 if ((m = m_pullup(m, offset)) == NULL) { 6203 SCTP_STAT_INCR(sctps_hdrops); 6204 return (IPPROTO_DONE); 6205 } 6206 } 6207 ip = mtod(m, struct ip *); 6208 sh = (struct sctphdr *)((caddr_t)ip + off); 6209 tag = htonl(sh->v_tag); 6210 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6211 m->m_pkthdr.flowid = flowid; 6212 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6213 } 6214 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6215 sctp_queue_to_mcore(m, off, cpu_to_use); 6216 return (IPPROTO_DONE); 6217 } 6218 #endif 6219 sctp_input_with_port(m, off, 0); 6220 return (IPPROTO_DONE); 6221 } 6222 6223 #endif 6224