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 if (asoc->strmout) { 369 for (i = 0; i < asoc->streamoutcnt; i++) { 370 asoc->strmout[i].state = SCTP_STREAM_OPEN; 371 } 372 } 373 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 374 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 375 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 376 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 377 } 378 /* This is the next one we expect */ 379 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 380 381 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 382 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 383 384 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 385 /* open the requested streams */ 386 387 if (asoc->strmin != NULL) { 388 /* Free the old ones */ 389 for (i = 0; i < asoc->streamincnt; i++) { 390 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 391 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 392 } 393 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 394 } 395 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 396 asoc->streamincnt = ntohs(init->num_outbound_streams); 397 } else { 398 asoc->streamincnt = asoc->max_inbound_streams; 399 } 400 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 401 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 402 if (asoc->strmin == NULL) { 403 /* we didn't get memory for the streams! */ 404 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 405 return (-1); 406 } 407 for (i = 0; i < asoc->streamincnt; i++) { 408 asoc->strmin[i].stream_no = i; 409 asoc->strmin[i].last_sequence_delivered = 0xffffffff; 410 TAILQ_INIT(&asoc->strmin[i].inqueue); 411 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 412 asoc->strmin[i].pd_api_started = 0; 413 asoc->strmin[i].delivery_started = 0; 414 } 415 /* 416 * load_address_from_init will put the addresses into the 417 * association when the COOKIE is processed or the INIT-ACK is 418 * processed. Both types of COOKIE's existing and new call this 419 * routine. It will remove addresses that are no longer in the 420 * association (for the restarting case where addresses are 421 * removed). Up front when the INIT arrives we will discard it if it 422 * is a restart and new addresses have been added. 423 */ 424 /* sa_ignore MEMLEAK */ 425 return (0); 426 } 427 428 /* 429 * INIT-ACK message processing/consumption returns value < 0 on error 430 */ 431 static int 432 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 433 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 434 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 435 struct sctp_nets *net, int *abort_no_unlock, 436 uint8_t mflowtype, uint32_t mflowid, 437 uint32_t vrf_id) 438 { 439 struct sctp_association *asoc; 440 struct mbuf *op_err; 441 int retval, abort_flag; 442 uint32_t initack_limit; 443 int nat_friendly = 0; 444 445 /* First verify that we have no illegal param's */ 446 abort_flag = 0; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 451 if (abort_flag) { 452 /* Send an abort and notify peer */ 453 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 454 *abort_no_unlock = 1; 455 return (-1); 456 } 457 asoc = &stcb->asoc; 458 asoc->peer_supports_nat = (uint8_t) nat_friendly; 459 /* process the peer's parameters in the INIT-ACK */ 460 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 461 if (retval < 0) { 462 return (retval); 463 } 464 initack_limit = offset + ntohs(cp->ch.chunk_length); 465 /* load all addresses */ 466 if ((retval = sctp_load_addresses_from_init(stcb, m, 467 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 468 src, dst, NULL, stcb->asoc.port))) { 469 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 470 "Problem with address parameters"); 471 SCTPDBG(SCTP_DEBUG_INPUT1, 472 "Load addresses from INIT causes an abort %d\n", 473 retval); 474 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 475 src, dst, sh, op_err, 476 mflowtype, mflowid, 477 vrf_id, net->port); 478 *abort_no_unlock = 1; 479 return (-1); 480 } 481 /* if the peer doesn't support asconf, flush the asconf queue */ 482 if (asoc->asconf_supported == 0) { 483 struct sctp_asconf_addr *param, *nparam; 484 485 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 486 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 487 SCTP_FREE(param, SCTP_M_ASC_ADDR); 488 } 489 } 490 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 491 stcb->asoc.local_hmacs); 492 if (op_err) { 493 sctp_queue_op_err(stcb, op_err); 494 /* queuing will steal away the mbuf chain to the out queue */ 495 op_err = NULL; 496 } 497 /* extract the cookie and queue it to "echo" it back... */ 498 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 499 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 500 stcb->asoc.overall_error_count, 501 0, 502 SCTP_FROM_SCTP_INPUT, 503 __LINE__); 504 } 505 stcb->asoc.overall_error_count = 0; 506 net->error_count = 0; 507 508 /* 509 * Cancel the INIT timer, We do this first before queueing the 510 * cookie. We always cancel at the primary to assue that we are 511 * canceling the timer started by the INIT which always goes to the 512 * primary. 513 */ 514 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 515 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 516 517 /* calculate the RTO */ 518 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 519 SCTP_RTT_FROM_NON_DATA); 520 retval = sctp_send_cookie_echo(m, offset, stcb, net); 521 if (retval < 0) { 522 /* 523 * No cookie, we probably should send a op error. But in any 524 * case if there is no cookie in the INIT-ACK, we can 525 * abandon the peer, its broke. 526 */ 527 if (retval == -3) { 528 uint16_t len; 529 530 len = (uint16_t) (sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 531 /* We abort with an error of missing mandatory param */ 532 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 533 if (op_err != NULL) { 534 struct sctp_error_missing_param *cause; 535 536 SCTP_BUF_LEN(op_err) = len; 537 cause = mtod(op_err, struct sctp_error_missing_param *); 538 /* Subtract the reserved param */ 539 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 540 cause->cause.length = htons(len); 541 cause->num_missing_params = htonl(1); 542 cause->type[0] = htons(SCTP_STATE_COOKIE); 543 } 544 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 545 src, dst, sh, op_err, 546 mflowtype, mflowid, 547 vrf_id, net->port); 548 *abort_no_unlock = 1; 549 } 550 return (retval); 551 } 552 return (0); 553 } 554 555 static void 556 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 557 struct sctp_tcb *stcb, struct sctp_nets *net) 558 { 559 union sctp_sockstore store; 560 struct sctp_nets *r_net, *f_net; 561 struct timeval tv; 562 int req_prim = 0; 563 uint16_t old_error_counter; 564 565 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 566 /* Invalid length */ 567 return; 568 } 569 memset(&store, 0, sizeof(store)); 570 switch (cp->heartbeat.hb_info.addr_family) { 571 #ifdef INET 572 case AF_INET: 573 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 574 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 575 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 576 store.sin.sin_port = stcb->rport; 577 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 578 sizeof(store.sin.sin_addr)); 579 } else { 580 return; 581 } 582 break; 583 #endif 584 #ifdef INET6 585 case AF_INET6: 586 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 587 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 588 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 589 store.sin6.sin6_port = stcb->rport; 590 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 591 } else { 592 return; 593 } 594 break; 595 #endif 596 default: 597 return; 598 } 599 r_net = sctp_findnet(stcb, &store.sa); 600 if (r_net == NULL) { 601 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 602 return; 603 } 604 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 605 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 606 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 607 /* 608 * If the its a HB and it's random value is correct when can 609 * confirm the destination. 610 */ 611 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 612 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 613 stcb->asoc.primary_destination = r_net; 614 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 615 f_net = TAILQ_FIRST(&stcb->asoc.nets); 616 if (f_net != r_net) { 617 /* 618 * first one on the list is NOT the primary 619 * sctp_cmpaddr() is much more efficient if 620 * the primary is the first on the list, 621 * make it so. 622 */ 623 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 624 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 625 } 626 req_prim = 1; 627 } 628 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 629 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 630 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 631 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 632 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 633 } 634 old_error_counter = r_net->error_count; 635 r_net->error_count = 0; 636 r_net->hb_responded = 1; 637 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 638 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 639 /* Now lets do a RTO with this */ 640 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 641 SCTP_RTT_FROM_NON_DATA); 642 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 643 r_net->dest_state |= SCTP_ADDR_REACHABLE; 644 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 645 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 646 } 647 if (r_net->dest_state & SCTP_ADDR_PF) { 648 r_net->dest_state &= ~SCTP_ADDR_PF; 649 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 650 } 651 if (old_error_counter > 0) { 652 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 653 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 654 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 655 } 656 if (r_net == stcb->asoc.primary_destination) { 657 if (stcb->asoc.alternate) { 658 /* release the alternate, primary is good */ 659 sctp_free_remote_addr(stcb->asoc.alternate); 660 stcb->asoc.alternate = NULL; 661 } 662 } 663 /* Mobility adaptation */ 664 if (req_prim) { 665 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 666 SCTP_MOBILITY_BASE) || 667 sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_FASTHANDOFF)) && 669 sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_PRIM_DELETED)) { 671 672 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 673 stcb->sctp_ep, stcb, NULL, 674 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 675 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_FASTHANDOFF)) { 677 sctp_assoc_immediate_retrans(stcb, 678 stcb->asoc.primary_destination); 679 } 680 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 681 SCTP_MOBILITY_BASE)) { 682 sctp_move_chunks_from_net(stcb, 683 stcb->asoc.deleted_primary); 684 } 685 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 686 stcb->asoc.deleted_primary); 687 } 688 } 689 } 690 691 static int 692 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 693 { 694 /* 695 * return 0 means we want you to proceed with the abort non-zero 696 * means no abort processing 697 */ 698 struct sctpasochead *head; 699 700 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 701 /* generate a new vtag and send init */ 702 LIST_REMOVE(stcb, sctp_asocs); 703 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 704 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 705 /* 706 * put it in the bucket in the vtag hash of assoc's for the 707 * system 708 */ 709 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 710 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 711 return (1); 712 } 713 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 714 /* 715 * treat like a case where the cookie expired i.e.: - dump 716 * current cookie. - generate a new vtag. - resend init. 717 */ 718 /* generate a new vtag and send init */ 719 LIST_REMOVE(stcb, sctp_asocs); 720 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 721 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 722 sctp_stop_all_cookie_timers(stcb); 723 sctp_toss_old_cookies(stcb, &stcb->asoc); 724 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 725 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 726 /* 727 * put it in the bucket in the vtag hash of assoc's for the 728 * system 729 */ 730 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 731 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 732 return (1); 733 } 734 return (0); 735 } 736 737 static int 738 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 739 struct sctp_nets *net) 740 { 741 /* 742 * return 0 means we want you to proceed with the abort non-zero 743 * means no abort processing 744 */ 745 if (stcb->asoc.auth_supported == 0) { 746 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 747 return (0); 748 } 749 sctp_asconf_send_nat_state_update(stcb, net); 750 return (1); 751 } 752 753 754 static void 755 sctp_handle_abort(struct sctp_abort_chunk *abort, 756 struct sctp_tcb *stcb, struct sctp_nets *net) 757 { 758 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 759 struct socket *so; 760 761 #endif 762 uint16_t len; 763 uint16_t error; 764 765 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 766 if (stcb == NULL) 767 return; 768 769 len = ntohs(abort->ch.chunk_length); 770 if (len > sizeof(struct sctp_chunkhdr)) { 771 /* 772 * Need to check the cause codes for our two magic nat 773 * aborts which don't kill the assoc necessarily. 774 */ 775 struct sctp_gen_error_cause *cause; 776 777 cause = (struct sctp_gen_error_cause *)(abort + 1); 778 error = ntohs(cause->code); 779 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 780 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 781 abort->ch.chunk_flags); 782 if (sctp_handle_nat_colliding_state(stcb)) { 783 return; 784 } 785 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 787 abort->ch.chunk_flags); 788 if (sctp_handle_nat_missing_state(stcb, net)) { 789 return; 790 } 791 } 792 } else { 793 error = 0; 794 } 795 /* stop any receive timers */ 796 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 797 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 798 /* notify user of the abort and clean up... */ 799 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 800 /* free the tcb */ 801 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 802 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 803 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 804 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 805 } 806 #ifdef SCTP_ASOCLOG_OF_TSNS 807 sctp_print_out_track_log(stcb); 808 #endif 809 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 810 so = SCTP_INP_SO(stcb->sctp_ep); 811 atomic_add_int(&stcb->asoc.refcnt, 1); 812 SCTP_TCB_UNLOCK(stcb); 813 SCTP_SOCKET_LOCK(so, 1); 814 SCTP_TCB_LOCK(stcb); 815 atomic_subtract_int(&stcb->asoc.refcnt, 1); 816 #endif 817 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 818 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 819 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 821 SCTP_SOCKET_UNLOCK(so, 1); 822 #endif 823 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 824 } 825 826 static void 827 sctp_start_net_timers(struct sctp_tcb *stcb) 828 { 829 uint32_t cnt_hb_sent; 830 struct sctp_nets *net; 831 832 cnt_hb_sent = 0; 833 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 834 /* 835 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 836 * If the dest in unconfirmed send a hb as well if under 837 * max_hb_burst have been sent. 838 */ 839 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 840 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 841 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 842 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 843 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 844 cnt_hb_sent++; 845 } 846 } 847 if (cnt_hb_sent) { 848 sctp_chunk_output(stcb->sctp_ep, stcb, 849 SCTP_OUTPUT_FROM_COOKIE_ACK, 850 SCTP_SO_NOT_LOCKED); 851 } 852 } 853 854 855 static void 856 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 857 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 858 { 859 struct sctp_association *asoc; 860 int some_on_streamwheel; 861 int old_state; 862 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866 #endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } 881 old_state = SCTP_GET_STATE(asoc); 882 sctp_update_acked(stcb, cp, abort_flag); 883 if (*abort_flag) { 884 return; 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 if (asoc->control_pdapi->on_strm_q) { 892 struct sctp_stream_in *strm; 893 894 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 895 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 896 /* Unordered */ 897 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 898 asoc->control_pdapi->on_strm_q = 0; 899 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 900 /* Ordered */ 901 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 902 asoc->control_pdapi->on_strm_q = 0; 903 #ifdef INVARIANTS 904 } else { 905 panic("Unknown state on ctrl:%p on_strm_q:%d", 906 asoc->control_pdapi, 907 asoc->control_pdapi->on_strm_q); 908 #endif 909 } 910 } 911 asoc->control_pdapi->end_added = 1; 912 asoc->control_pdapi->pdapi_aborted = 1; 913 asoc->control_pdapi = NULL; 914 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 915 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 916 so = SCTP_INP_SO(stcb->sctp_ep); 917 atomic_add_int(&stcb->asoc.refcnt, 1); 918 SCTP_TCB_UNLOCK(stcb); 919 SCTP_SOCKET_LOCK(so, 1); 920 SCTP_TCB_LOCK(stcb); 921 atomic_subtract_int(&stcb->asoc.refcnt, 1); 922 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 923 /* assoc was freed while we were unlocked */ 924 SCTP_SOCKET_UNLOCK(so, 1); 925 return; 926 } 927 #endif 928 if (stcb->sctp_socket) { 929 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 930 } 931 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 932 SCTP_SOCKET_UNLOCK(so, 1); 933 #endif 934 } 935 /* goto SHUTDOWN_RECEIVED state to block new requests */ 936 if (stcb->sctp_socket) { 937 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 938 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 939 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 940 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 941 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 942 /* 943 * notify upper layer that peer has initiated a 944 * shutdown 945 */ 946 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 947 948 /* reset time */ 949 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 950 } 951 } 952 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 953 /* 954 * stop the shutdown timer, since we WILL move to 955 * SHUTDOWN-ACK-SENT. 956 */ 957 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 958 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 959 } 960 /* Now is there unsent data on a stream somewhere? */ 961 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 962 963 if (!TAILQ_EMPTY(&asoc->send_queue) || 964 !TAILQ_EMPTY(&asoc->sent_queue) || 965 some_on_streamwheel) { 966 /* By returning we will push more data out */ 967 return; 968 } else { 969 /* no outstanding data to send, so move on... */ 970 /* send SHUTDOWN-ACK */ 971 /* move to SHUTDOWN-ACK-SENT state */ 972 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 973 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 974 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 975 } 976 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 977 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 978 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 979 sctp_stop_timers_for_shutdown(stcb); 980 sctp_send_shutdown_ack(stcb, net); 981 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 982 stcb->sctp_ep, stcb, net); 983 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 984 sctp_send_shutdown_ack(stcb, net); 985 } 986 } 987 } 988 989 static void 990 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 991 struct sctp_tcb *stcb, 992 struct sctp_nets *net) 993 { 994 struct sctp_association *asoc; 995 996 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 997 struct socket *so; 998 999 so = SCTP_INP_SO(stcb->sctp_ep); 1000 #endif 1001 SCTPDBG(SCTP_DEBUG_INPUT2, 1002 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1003 if (stcb == NULL) 1004 return; 1005 1006 asoc = &stcb->asoc; 1007 /* process according to association state */ 1008 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1009 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1010 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1011 sctp_send_shutdown_complete(stcb, net, 1); 1012 SCTP_TCB_UNLOCK(stcb); 1013 return; 1014 } 1015 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1016 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1017 /* unexpected SHUTDOWN-ACK... so ignore... */ 1018 SCTP_TCB_UNLOCK(stcb); 1019 return; 1020 } 1021 if (asoc->control_pdapi) { 1022 /* 1023 * With a normal shutdown we assume the end of last record. 1024 */ 1025 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1026 asoc->control_pdapi->end_added = 1; 1027 asoc->control_pdapi->pdapi_aborted = 1; 1028 asoc->control_pdapi = NULL; 1029 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1030 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1031 atomic_add_int(&stcb->asoc.refcnt, 1); 1032 SCTP_TCB_UNLOCK(stcb); 1033 SCTP_SOCKET_LOCK(so, 1); 1034 SCTP_TCB_LOCK(stcb); 1035 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1036 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1037 /* assoc was freed while we were unlocked */ 1038 SCTP_SOCKET_UNLOCK(so, 1); 1039 return; 1040 } 1041 #endif 1042 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1043 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1044 SCTP_SOCKET_UNLOCK(so, 1); 1045 #endif 1046 } 1047 #ifdef INVARIANTS 1048 if (!TAILQ_EMPTY(&asoc->send_queue) || 1049 !TAILQ_EMPTY(&asoc->sent_queue) || 1050 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1051 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1052 } 1053 #endif 1054 /* stop the timer */ 1055 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1057 /* send SHUTDOWN-COMPLETE */ 1058 sctp_send_shutdown_complete(stcb, net, 0); 1059 /* notify upper layer protocol */ 1060 if (stcb->sctp_socket) { 1061 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1062 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1063 stcb->sctp_socket->so_snd.sb_cc = 0; 1064 } 1065 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1066 } 1067 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1068 /* free the TCB but first save off the ep */ 1069 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1070 atomic_add_int(&stcb->asoc.refcnt, 1); 1071 SCTP_TCB_UNLOCK(stcb); 1072 SCTP_SOCKET_LOCK(so, 1); 1073 SCTP_TCB_LOCK(stcb); 1074 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1075 #endif 1076 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1077 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1078 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1079 SCTP_SOCKET_UNLOCK(so, 1); 1080 #endif 1081 } 1082 1083 /* 1084 * Skip past the param header and then we will find the chunk that caused the 1085 * problem. There are two possibilities ASCONF or FWD-TSN other than that and 1086 * our peer must be broken. 1087 */ 1088 static void 1089 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1090 struct sctp_nets *net) 1091 { 1092 struct sctp_chunkhdr *chk; 1093 1094 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1095 switch (chk->chunk_type) { 1096 case SCTP_ASCONF_ACK: 1097 case SCTP_ASCONF: 1098 sctp_asconf_cleanup(stcb, net); 1099 break; 1100 case SCTP_IFORWARD_CUM_TSN: 1101 case SCTP_FORWARD_CUM_TSN: 1102 stcb->asoc.prsctp_supported = 0; 1103 break; 1104 default: 1105 SCTPDBG(SCTP_DEBUG_INPUT2, 1106 "Peer does not support chunk type %d(%x)??\n", 1107 chk->chunk_type, (uint32_t) chk->chunk_type); 1108 break; 1109 } 1110 } 1111 1112 /* 1113 * Skip past the param header and then we will find the param that caused the 1114 * problem. There are a number of param's in a ASCONF OR the prsctp param 1115 * these will turn of specific features. 1116 * XXX: Is this the right thing to do? 1117 */ 1118 static void 1119 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1120 { 1121 struct sctp_paramhdr *pbad; 1122 1123 pbad = phdr + 1; 1124 switch (ntohs(pbad->param_type)) { 1125 /* pr-sctp draft */ 1126 case SCTP_PRSCTP_SUPPORTED: 1127 stcb->asoc.prsctp_supported = 0; 1128 break; 1129 case SCTP_SUPPORTED_CHUNK_EXT: 1130 break; 1131 /* draft-ietf-tsvwg-addip-sctp */ 1132 case SCTP_HAS_NAT_SUPPORT: 1133 stcb->asoc.peer_supports_nat = 0; 1134 break; 1135 case SCTP_ADD_IP_ADDRESS: 1136 case SCTP_DEL_IP_ADDRESS: 1137 case SCTP_SET_PRIM_ADDR: 1138 stcb->asoc.asconf_supported = 0; 1139 break; 1140 case SCTP_SUCCESS_REPORT: 1141 case SCTP_ERROR_CAUSE_IND: 1142 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1143 SCTPDBG(SCTP_DEBUG_INPUT2, 1144 "Turning off ASCONF to this strange peer\n"); 1145 stcb->asoc.asconf_supported = 0; 1146 break; 1147 default: 1148 SCTPDBG(SCTP_DEBUG_INPUT2, 1149 "Peer does not support param type %d(%x)??\n", 1150 pbad->param_type, (uint32_t) pbad->param_type); 1151 break; 1152 } 1153 } 1154 1155 static int 1156 sctp_handle_error(struct sctp_chunkhdr *ch, 1157 struct sctp_tcb *stcb, struct sctp_nets *net) 1158 { 1159 int chklen; 1160 struct sctp_paramhdr *phdr; 1161 uint16_t error, error_type; 1162 uint16_t error_len; 1163 struct sctp_association *asoc; 1164 int adjust; 1165 1166 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1167 struct socket *so; 1168 1169 #endif 1170 1171 /* parse through all of the errors and process */ 1172 asoc = &stcb->asoc; 1173 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1174 sizeof(struct sctp_chunkhdr)); 1175 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1176 error = 0; 1177 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1178 /* Process an Error Cause */ 1179 error_type = ntohs(phdr->param_type); 1180 error_len = ntohs(phdr->param_length); 1181 if ((error_len > chklen) || (error_len == 0)) { 1182 /* invalid param length for this param */ 1183 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1184 chklen, error_len); 1185 return (0); 1186 } 1187 if (error == 0) { 1188 /* report the first error cause */ 1189 error = error_type; 1190 } 1191 switch (error_type) { 1192 case SCTP_CAUSE_INVALID_STREAM: 1193 case SCTP_CAUSE_MISSING_PARAM: 1194 case SCTP_CAUSE_INVALID_PARAM: 1195 case SCTP_CAUSE_NO_USER_DATA: 1196 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1197 error_type); 1198 break; 1199 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1200 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1201 ch->chunk_flags); 1202 if (sctp_handle_nat_colliding_state(stcb)) { 1203 return (0); 1204 } 1205 break; 1206 case SCTP_CAUSE_NAT_MISSING_STATE: 1207 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1208 ch->chunk_flags); 1209 if (sctp_handle_nat_missing_state(stcb, net)) { 1210 return (0); 1211 } 1212 break; 1213 case SCTP_CAUSE_STALE_COOKIE: 1214 /* 1215 * We only act if we have echoed a cookie and are 1216 * waiting. 1217 */ 1218 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1219 int *p; 1220 1221 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1222 /* Save the time doubled */ 1223 asoc->cookie_preserve_req = ntohl(*p) << 1; 1224 asoc->stale_cookie_count++; 1225 if (asoc->stale_cookie_count > 1226 asoc->max_init_times) { 1227 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1228 /* now free the asoc */ 1229 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1230 so = SCTP_INP_SO(stcb->sctp_ep); 1231 atomic_add_int(&stcb->asoc.refcnt, 1); 1232 SCTP_TCB_UNLOCK(stcb); 1233 SCTP_SOCKET_LOCK(so, 1); 1234 SCTP_TCB_LOCK(stcb); 1235 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1236 #endif 1237 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1238 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1239 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1240 SCTP_SOCKET_UNLOCK(so, 1); 1241 #endif 1242 return (-1); 1243 } 1244 /* blast back to INIT state */ 1245 sctp_toss_old_cookies(stcb, &stcb->asoc); 1246 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1247 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1248 sctp_stop_all_cookie_timers(stcb); 1249 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1250 } 1251 break; 1252 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1253 /* 1254 * Nothing we can do here, we don't do hostname 1255 * addresses so if the peer does not like my IPv6 1256 * (or IPv4 for that matter) it does not matter. If 1257 * they don't support that type of address, they can 1258 * NOT possibly get that packet type... i.e. with no 1259 * IPv6 you can't receive a IPv6 packet. so we can 1260 * safely ignore this one. If we ever added support 1261 * for HOSTNAME Addresses, then we would need to do 1262 * something here. 1263 */ 1264 break; 1265 case SCTP_CAUSE_UNRECOG_CHUNK: 1266 sctp_process_unrecog_chunk(stcb, phdr, net); 1267 break; 1268 case SCTP_CAUSE_UNRECOG_PARAM: 1269 sctp_process_unrecog_param(stcb, phdr); 1270 break; 1271 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1272 /* 1273 * We ignore this since the timer will drive out a 1274 * new cookie anyway and there timer will drive us 1275 * to send a SHUTDOWN_COMPLETE. We can't send one 1276 * here since we don't have their tag. 1277 */ 1278 break; 1279 case SCTP_CAUSE_DELETING_LAST_ADDR: 1280 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1281 case SCTP_CAUSE_DELETING_SRC_ADDR: 1282 /* 1283 * We should NOT get these here, but in a 1284 * ASCONF-ACK. 1285 */ 1286 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1287 error_type); 1288 break; 1289 case SCTP_CAUSE_OUT_OF_RESC: 1290 /* 1291 * And what, pray tell do we do with the fact that 1292 * the peer is out of resources? Not really sure we 1293 * could do anything but abort. I suspect this 1294 * should have came WITH an abort instead of in a 1295 * OP-ERROR. 1296 */ 1297 break; 1298 default: 1299 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1300 error_type); 1301 break; 1302 } 1303 adjust = SCTP_SIZE32(error_len); 1304 chklen -= adjust; 1305 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1306 } 1307 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1308 return (0); 1309 } 1310 1311 static int 1312 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1313 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1314 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1315 struct sctp_nets *net, int *abort_no_unlock, 1316 uint8_t mflowtype, uint32_t mflowid, 1317 uint32_t vrf_id) 1318 { 1319 struct sctp_init_ack *init_ack; 1320 struct mbuf *op_err; 1321 1322 SCTPDBG(SCTP_DEBUG_INPUT2, 1323 "sctp_handle_init_ack: handling INIT-ACK\n"); 1324 1325 if (stcb == NULL) { 1326 SCTPDBG(SCTP_DEBUG_INPUT2, 1327 "sctp_handle_init_ack: TCB is null\n"); 1328 return (-1); 1329 } 1330 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1331 /* Invalid length */ 1332 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1333 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1334 src, dst, sh, op_err, 1335 mflowtype, mflowid, 1336 vrf_id, net->port); 1337 *abort_no_unlock = 1; 1338 return (-1); 1339 } 1340 init_ack = &cp->init; 1341 /* validate parameters */ 1342 if (init_ack->initiate_tag == 0) { 1343 /* protocol error... send an abort */ 1344 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1345 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1346 src, dst, sh, op_err, 1347 mflowtype, mflowid, 1348 vrf_id, net->port); 1349 *abort_no_unlock = 1; 1350 return (-1); 1351 } 1352 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1353 /* protocol error... send an abort */ 1354 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1355 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1356 src, dst, sh, op_err, 1357 mflowtype, mflowid, 1358 vrf_id, net->port); 1359 *abort_no_unlock = 1; 1360 return (-1); 1361 } 1362 if (init_ack->num_inbound_streams == 0) { 1363 /* protocol error... send an abort */ 1364 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1365 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1366 src, dst, sh, op_err, 1367 mflowtype, mflowid, 1368 vrf_id, net->port); 1369 *abort_no_unlock = 1; 1370 return (-1); 1371 } 1372 if (init_ack->num_outbound_streams == 0) { 1373 /* protocol error... send an abort */ 1374 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1375 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1376 src, dst, sh, op_err, 1377 mflowtype, mflowid, 1378 vrf_id, net->port); 1379 *abort_no_unlock = 1; 1380 return (-1); 1381 } 1382 /* process according to association state... */ 1383 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1384 case SCTP_STATE_COOKIE_WAIT: 1385 /* this is the expected state for this chunk */ 1386 /* process the INIT-ACK parameters */ 1387 if (stcb->asoc.primary_destination->dest_state & 1388 SCTP_ADDR_UNCONFIRMED) { 1389 /* 1390 * The primary is where we sent the INIT, we can 1391 * always consider it confirmed when the INIT-ACK is 1392 * returned. Do this before we load addresses 1393 * though. 1394 */ 1395 stcb->asoc.primary_destination->dest_state &= 1396 ~SCTP_ADDR_UNCONFIRMED; 1397 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1398 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1399 } 1400 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1401 net, abort_no_unlock, 1402 mflowtype, mflowid, 1403 vrf_id) < 0) { 1404 /* error in parsing parameters */ 1405 return (-1); 1406 } 1407 /* update our state */ 1408 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1409 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1410 1411 /* reset the RTO calc */ 1412 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1413 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1414 stcb->asoc.overall_error_count, 1415 0, 1416 SCTP_FROM_SCTP_INPUT, 1417 __LINE__); 1418 } 1419 stcb->asoc.overall_error_count = 0; 1420 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1421 /* 1422 * collapse the init timer back in case of a exponential 1423 * backoff 1424 */ 1425 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1426 stcb, net); 1427 /* 1428 * the send at the end of the inbound data processing will 1429 * cause the cookie to be sent 1430 */ 1431 break; 1432 case SCTP_STATE_SHUTDOWN_SENT: 1433 /* incorrect state... discard */ 1434 break; 1435 case SCTP_STATE_COOKIE_ECHOED: 1436 /* incorrect state... discard */ 1437 break; 1438 case SCTP_STATE_OPEN: 1439 /* incorrect state... discard */ 1440 break; 1441 case SCTP_STATE_EMPTY: 1442 case SCTP_STATE_INUSE: 1443 default: 1444 /* incorrect state... discard */ 1445 return (-1); 1446 break; 1447 } 1448 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1449 return (0); 1450 } 1451 1452 static struct sctp_tcb * 1453 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1454 struct sockaddr *src, struct sockaddr *dst, 1455 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1456 struct sctp_inpcb *inp, struct sctp_nets **netp, 1457 struct sockaddr *init_src, int *notification, 1458 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1459 uint8_t mflowtype, uint32_t mflowid, 1460 uint32_t vrf_id, uint16_t port); 1461 1462 1463 /* 1464 * handle a state cookie for an existing association m: input packet mbuf 1465 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1466 * "split" mbuf and the cookie signature does not exist offset: offset into 1467 * mbuf to the cookie-echo chunk 1468 */ 1469 static struct sctp_tcb * 1470 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1471 struct sockaddr *src, struct sockaddr *dst, 1472 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1473 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1474 struct sockaddr *init_src, int *notification, 1475 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1476 uint8_t mflowtype, uint32_t mflowid, 1477 uint32_t vrf_id, uint16_t port) 1478 { 1479 struct sctp_association *asoc; 1480 struct sctp_init_chunk *init_cp, init_buf; 1481 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1482 struct sctp_nets *net; 1483 struct mbuf *op_err; 1484 int init_offset, initack_offset, i; 1485 int retval; 1486 int spec_flag = 0; 1487 uint32_t how_indx; 1488 1489 #if defined(SCTP_DETAILED_STR_STATS) 1490 int j; 1491 1492 #endif 1493 1494 net = *netp; 1495 /* I know that the TCB is non-NULL from the caller */ 1496 asoc = &stcb->asoc; 1497 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1498 if (asoc->cookie_how[how_indx] == 0) 1499 break; 1500 } 1501 if (how_indx < sizeof(asoc->cookie_how)) { 1502 asoc->cookie_how[how_indx] = 1; 1503 } 1504 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1505 /* SHUTDOWN came in after sending INIT-ACK */ 1506 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1507 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1508 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1509 mflowtype, mflowid, inp->fibnum, 1510 vrf_id, net->port); 1511 if (how_indx < sizeof(asoc->cookie_how)) 1512 asoc->cookie_how[how_indx] = 2; 1513 return (NULL); 1514 } 1515 /* 1516 * find and validate the INIT chunk in the cookie (peer's info) the 1517 * INIT should start after the cookie-echo header struct (chunk 1518 * header, state cookie header struct) 1519 */ 1520 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1521 1522 init_cp = (struct sctp_init_chunk *) 1523 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1524 (uint8_t *) & init_buf); 1525 if (init_cp == NULL) { 1526 /* could not pull a INIT chunk in cookie */ 1527 return (NULL); 1528 } 1529 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1530 return (NULL); 1531 } 1532 /* 1533 * find and validate the INIT-ACK chunk in the cookie (my info) the 1534 * INIT-ACK follows the INIT chunk 1535 */ 1536 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1537 initack_cp = (struct sctp_init_ack_chunk *) 1538 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1539 (uint8_t *) & initack_buf); 1540 if (initack_cp == NULL) { 1541 /* could not pull INIT-ACK chunk in cookie */ 1542 return (NULL); 1543 } 1544 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1545 return (NULL); 1546 } 1547 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1548 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1549 /* 1550 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1551 * to get into the OPEN state 1552 */ 1553 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1554 /*- 1555 * Opps, this means that we somehow generated two vtag's 1556 * the same. I.e. we did: 1557 * Us Peer 1558 * <---INIT(tag=a)------ 1559 * ----INIT-ACK(tag=t)--> 1560 * ----INIT(tag=t)------> *1 1561 * <---INIT-ACK(tag=a)--- 1562 * <----CE(tag=t)------------- *2 1563 * 1564 * At point *1 we should be generating a different 1565 * tag t'. Which means we would throw away the CE and send 1566 * ours instead. Basically this is case C (throw away side). 1567 */ 1568 if (how_indx < sizeof(asoc->cookie_how)) 1569 asoc->cookie_how[how_indx] = 17; 1570 return (NULL); 1571 1572 } 1573 switch (SCTP_GET_STATE(asoc)) { 1574 case SCTP_STATE_COOKIE_WAIT: 1575 case SCTP_STATE_COOKIE_ECHOED: 1576 /* 1577 * INIT was sent but got a COOKIE_ECHO with the 1578 * correct tags... just accept it...but we must 1579 * process the init so that we can make sure we have 1580 * the right seq no's. 1581 */ 1582 /* First we must process the INIT !! */ 1583 retval = sctp_process_init(init_cp, stcb); 1584 if (retval < 0) { 1585 if (how_indx < sizeof(asoc->cookie_how)) 1586 asoc->cookie_how[how_indx] = 3; 1587 return (NULL); 1588 } 1589 /* we have already processed the INIT so no problem */ 1590 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1591 stcb, net, 1592 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1593 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1594 stcb, net, 1595 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1596 /* update current state */ 1597 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1598 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1599 else 1600 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1601 1602 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1603 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1604 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1605 stcb->sctp_ep, stcb, asoc->primary_destination); 1606 } 1607 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1608 sctp_stop_all_cookie_timers(stcb); 1609 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1610 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1611 (inp->sctp_socket->so_qlimit == 0) 1612 ) { 1613 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1614 struct socket *so; 1615 1616 #endif 1617 /* 1618 * Here is where collision would go if we 1619 * did a connect() and instead got a 1620 * init/init-ack/cookie done before the 1621 * init-ack came back.. 1622 */ 1623 stcb->sctp_ep->sctp_flags |= 1624 SCTP_PCB_FLAGS_CONNECTED; 1625 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1626 so = SCTP_INP_SO(stcb->sctp_ep); 1627 atomic_add_int(&stcb->asoc.refcnt, 1); 1628 SCTP_TCB_UNLOCK(stcb); 1629 SCTP_SOCKET_LOCK(so, 1); 1630 SCTP_TCB_LOCK(stcb); 1631 atomic_add_int(&stcb->asoc.refcnt, -1); 1632 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1633 SCTP_SOCKET_UNLOCK(so, 1); 1634 return (NULL); 1635 } 1636 #endif 1637 soisconnected(stcb->sctp_socket); 1638 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1639 SCTP_SOCKET_UNLOCK(so, 1); 1640 #endif 1641 } 1642 /* notify upper layer */ 1643 *notification = SCTP_NOTIFY_ASSOC_UP; 1644 /* 1645 * since we did not send a HB make sure we don't 1646 * double things 1647 */ 1648 net->hb_responded = 1; 1649 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1650 &cookie->time_entered, 1651 sctp_align_unsafe_makecopy, 1652 SCTP_RTT_FROM_NON_DATA); 1653 1654 if (stcb->asoc.sctp_autoclose_ticks && 1655 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1656 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1657 inp, stcb, NULL); 1658 } 1659 break; 1660 default: 1661 /* 1662 * we're in the OPEN state (or beyond), so peer must 1663 * have simply lost the COOKIE-ACK 1664 */ 1665 break; 1666 } /* end switch */ 1667 sctp_stop_all_cookie_timers(stcb); 1668 /* 1669 * We ignore the return code here.. not sure if we should 1670 * somehow abort.. but we do have an existing asoc. This 1671 * really should not fail. 1672 */ 1673 if (sctp_load_addresses_from_init(stcb, m, 1674 init_offset + sizeof(struct sctp_init_chunk), 1675 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1676 if (how_indx < sizeof(asoc->cookie_how)) 1677 asoc->cookie_how[how_indx] = 4; 1678 return (NULL); 1679 } 1680 /* respond with a COOKIE-ACK */ 1681 sctp_toss_old_cookies(stcb, asoc); 1682 sctp_send_cookie_ack(stcb); 1683 if (how_indx < sizeof(asoc->cookie_how)) 1684 asoc->cookie_how[how_indx] = 5; 1685 return (stcb); 1686 } 1687 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1688 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1689 cookie->tie_tag_my_vtag == 0 && 1690 cookie->tie_tag_peer_vtag == 0) { 1691 /* 1692 * case C in Section 5.2.4 Table 2: XMOO silently discard 1693 */ 1694 if (how_indx < sizeof(asoc->cookie_how)) 1695 asoc->cookie_how[how_indx] = 6; 1696 return (NULL); 1697 } 1698 /* 1699 * If nat support, and the below and stcb is established, send back 1700 * a ABORT(colliding state) if we are established. 1701 */ 1702 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1703 (asoc->peer_supports_nat) && 1704 ((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 * Special case - Peer's support nat. We may have two init's 1709 * that we gave out the same tag on since one was not 1710 * established.. i.e. we get INIT from host-1 behind the nat 1711 * and we respond tag-a, we get a INIT from host-2 behind 1712 * the nat and we get tag-a again. Then we bring up host-1 1713 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1714 * Now we have colliding state. We must send an abort here 1715 * with colliding state indication. 1716 */ 1717 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1718 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1719 mflowtype, mflowid, inp->fibnum, 1720 vrf_id, port); 1721 return (NULL); 1722 } 1723 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1724 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1725 (asoc->peer_vtag == 0))) { 1726 /* 1727 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1728 * should be ok, re-accept peer info 1729 */ 1730 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1731 /* 1732 * Extension of case C. If we hit this, then the 1733 * random number generator returned the same vtag 1734 * when we first sent our INIT-ACK and when we later 1735 * sent our INIT. The side with the seq numbers that 1736 * are different will be the one that normnally 1737 * would have hit case C. This in effect "extends" 1738 * our vtags in this collision case to be 64 bits. 1739 * The same collision could occur aka you get both 1740 * vtag and seq number the same twice in a row.. but 1741 * is much less likely. If it did happen then we 1742 * would proceed through and bring up the assoc.. we 1743 * may end up with the wrong stream setup however.. 1744 * which would be bad.. but there is no way to 1745 * tell.. until we send on a stream that does not 1746 * exist :-) 1747 */ 1748 if (how_indx < sizeof(asoc->cookie_how)) 1749 asoc->cookie_how[how_indx] = 7; 1750 1751 return (NULL); 1752 } 1753 if (how_indx < sizeof(asoc->cookie_how)) 1754 asoc->cookie_how[how_indx] = 8; 1755 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1756 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1757 sctp_stop_all_cookie_timers(stcb); 1758 /* 1759 * since we did not send a HB make sure we don't double 1760 * things 1761 */ 1762 net->hb_responded = 1; 1763 if (stcb->asoc.sctp_autoclose_ticks && 1764 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1765 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1766 NULL); 1767 } 1768 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1769 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1770 1771 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1772 /* 1773 * Ok the peer probably discarded our data (if we 1774 * echoed a cookie+data). So anything on the 1775 * sent_queue should be marked for retransmit, we 1776 * may not get something to kick us so it COULD 1777 * still take a timeout to move these.. but it can't 1778 * hurt to mark them. 1779 */ 1780 struct sctp_tmit_chunk *chk; 1781 1782 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1783 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1784 chk->sent = SCTP_DATAGRAM_RESEND; 1785 sctp_flight_size_decrease(chk); 1786 sctp_total_flight_decrease(stcb, chk); 1787 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1788 spec_flag++; 1789 } 1790 } 1791 1792 } 1793 /* process the INIT info (peer's info) */ 1794 retval = sctp_process_init(init_cp, stcb); 1795 if (retval < 0) { 1796 if (how_indx < sizeof(asoc->cookie_how)) 1797 asoc->cookie_how[how_indx] = 9; 1798 return (NULL); 1799 } 1800 if (sctp_load_addresses_from_init(stcb, m, 1801 init_offset + sizeof(struct sctp_init_chunk), 1802 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1803 if (how_indx < sizeof(asoc->cookie_how)) 1804 asoc->cookie_how[how_indx] = 10; 1805 return (NULL); 1806 } 1807 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1808 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1809 *notification = SCTP_NOTIFY_ASSOC_UP; 1810 1811 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1812 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1813 (inp->sctp_socket->so_qlimit == 0)) { 1814 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 struct socket *so; 1816 1817 #endif 1818 stcb->sctp_ep->sctp_flags |= 1819 SCTP_PCB_FLAGS_CONNECTED; 1820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1821 so = SCTP_INP_SO(stcb->sctp_ep); 1822 atomic_add_int(&stcb->asoc.refcnt, 1); 1823 SCTP_TCB_UNLOCK(stcb); 1824 SCTP_SOCKET_LOCK(so, 1); 1825 SCTP_TCB_LOCK(stcb); 1826 atomic_add_int(&stcb->asoc.refcnt, -1); 1827 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1828 SCTP_SOCKET_UNLOCK(so, 1); 1829 return (NULL); 1830 } 1831 #endif 1832 soisconnected(stcb->sctp_socket); 1833 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1834 SCTP_SOCKET_UNLOCK(so, 1); 1835 #endif 1836 } 1837 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1838 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1839 else 1840 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1841 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1842 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1843 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1844 } else { 1845 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1846 } 1847 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1848 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1849 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1850 stcb->sctp_ep, stcb, asoc->primary_destination); 1851 } 1852 sctp_stop_all_cookie_timers(stcb); 1853 sctp_toss_old_cookies(stcb, asoc); 1854 sctp_send_cookie_ack(stcb); 1855 if (spec_flag) { 1856 /* 1857 * only if we have retrans set do we do this. What 1858 * this call does is get only the COOKIE-ACK out and 1859 * then when we return the normal call to 1860 * sctp_chunk_output will get the retrans out behind 1861 * this. 1862 */ 1863 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1864 } 1865 if (how_indx < sizeof(asoc->cookie_how)) 1866 asoc->cookie_how[how_indx] = 11; 1867 1868 return (stcb); 1869 } 1870 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1871 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1872 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1873 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1874 cookie->tie_tag_peer_vtag != 0) { 1875 struct sctpasochead *head; 1876 1877 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1878 struct socket *so; 1879 1880 #endif 1881 1882 if (asoc->peer_supports_nat) { 1883 /* 1884 * This is a gross gross hack. Just call the 1885 * cookie_new code since we are allowing a duplicate 1886 * association. I hope this works... 1887 */ 1888 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1889 sh, cookie, cookie_len, 1890 inp, netp, init_src, notification, 1891 auth_skipped, auth_offset, auth_len, 1892 mflowtype, mflowid, 1893 vrf_id, port)); 1894 } 1895 /* 1896 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1897 */ 1898 /* temp code */ 1899 if (how_indx < sizeof(asoc->cookie_how)) 1900 asoc->cookie_how[how_indx] = 12; 1901 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1902 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1903 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1904 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1905 1906 /* notify upper layer */ 1907 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1908 atomic_add_int(&stcb->asoc.refcnt, 1); 1909 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1910 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1911 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1912 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1913 } 1914 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1915 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1916 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1917 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1918 } 1919 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1920 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1921 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1922 stcb->sctp_ep, stcb, asoc->primary_destination); 1923 1924 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1925 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1926 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1927 } 1928 asoc->pre_open_streams = 1929 ntohs(initack_cp->init.num_outbound_streams); 1930 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1931 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1932 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1933 1934 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1935 1936 asoc->str_reset_seq_in = asoc->init_seq_number; 1937 1938 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1939 if (asoc->mapping_array) { 1940 memset(asoc->mapping_array, 0, 1941 asoc->mapping_array_size); 1942 } 1943 if (asoc->nr_mapping_array) { 1944 memset(asoc->nr_mapping_array, 0, 1945 asoc->mapping_array_size); 1946 } 1947 SCTP_TCB_UNLOCK(stcb); 1948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1949 so = SCTP_INP_SO(stcb->sctp_ep); 1950 SCTP_SOCKET_LOCK(so, 1); 1951 #endif 1952 SCTP_INP_INFO_WLOCK(); 1953 SCTP_INP_WLOCK(stcb->sctp_ep); 1954 SCTP_TCB_LOCK(stcb); 1955 atomic_add_int(&stcb->asoc.refcnt, -1); 1956 /* send up all the data */ 1957 SCTP_TCB_SEND_LOCK(stcb); 1958 1959 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1960 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1961 stcb->asoc.strmout[i].chunks_on_queues = 0; 1962 #if defined(SCTP_DETAILED_STR_STATS) 1963 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1964 asoc->strmout[i].abandoned_sent[j] = 0; 1965 asoc->strmout[i].abandoned_unsent[j] = 0; 1966 } 1967 #else 1968 asoc->strmout[i].abandoned_sent[0] = 0; 1969 asoc->strmout[i].abandoned_unsent[0] = 0; 1970 #endif 1971 stcb->asoc.strmout[i].stream_no = i; 1972 stcb->asoc.strmout[i].next_sequence_send = 0; 1973 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1974 } 1975 /* process the INIT-ACK info (my info) */ 1976 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1977 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1978 1979 /* pull from vtag hash */ 1980 LIST_REMOVE(stcb, sctp_asocs); 1981 /* re-insert to new vtag position */ 1982 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1983 SCTP_BASE_INFO(hashasocmark))]; 1984 /* 1985 * put it in the bucket in the vtag hash of assoc's for the 1986 * system 1987 */ 1988 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1989 1990 SCTP_TCB_SEND_UNLOCK(stcb); 1991 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1992 SCTP_INP_INFO_WUNLOCK(); 1993 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1994 SCTP_SOCKET_UNLOCK(so, 1); 1995 #endif 1996 asoc->total_flight = 0; 1997 asoc->total_flight_count = 0; 1998 /* process the INIT info (peer's info) */ 1999 retval = sctp_process_init(init_cp, stcb); 2000 if (retval < 0) { 2001 if (how_indx < sizeof(asoc->cookie_how)) 2002 asoc->cookie_how[how_indx] = 13; 2003 2004 return (NULL); 2005 } 2006 /* 2007 * since we did not send a HB make sure we don't double 2008 * things 2009 */ 2010 net->hb_responded = 1; 2011 2012 if (sctp_load_addresses_from_init(stcb, m, 2013 init_offset + sizeof(struct sctp_init_chunk), 2014 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2015 if (how_indx < sizeof(asoc->cookie_how)) 2016 asoc->cookie_how[how_indx] = 14; 2017 2018 return (NULL); 2019 } 2020 /* respond with a COOKIE-ACK */ 2021 sctp_stop_all_cookie_timers(stcb); 2022 sctp_toss_old_cookies(stcb, asoc); 2023 sctp_send_cookie_ack(stcb); 2024 if (how_indx < sizeof(asoc->cookie_how)) 2025 asoc->cookie_how[how_indx] = 15; 2026 2027 return (stcb); 2028 } 2029 if (how_indx < sizeof(asoc->cookie_how)) 2030 asoc->cookie_how[how_indx] = 16; 2031 /* all other cases... */ 2032 return (NULL); 2033 } 2034 2035 2036 /* 2037 * handle a state cookie for a new association m: input packet mbuf chain-- 2038 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2039 * and the cookie signature does not exist offset: offset into mbuf to the 2040 * cookie-echo chunk length: length of the cookie chunk to: where the init 2041 * was from returns a new TCB 2042 */ 2043 static struct sctp_tcb * 2044 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2045 struct sockaddr *src, struct sockaddr *dst, 2046 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2047 struct sctp_inpcb *inp, struct sctp_nets **netp, 2048 struct sockaddr *init_src, int *notification, 2049 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2050 uint8_t mflowtype, uint32_t mflowid, 2051 uint32_t vrf_id, uint16_t port) 2052 { 2053 struct sctp_tcb *stcb; 2054 struct sctp_init_chunk *init_cp, init_buf; 2055 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2056 union sctp_sockstore store; 2057 struct sctp_association *asoc; 2058 int init_offset, initack_offset, initack_limit; 2059 int retval; 2060 int error = 0; 2061 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2062 2063 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2064 struct socket *so; 2065 2066 so = SCTP_INP_SO(inp); 2067 #endif 2068 2069 /* 2070 * find and validate the INIT chunk in the cookie (peer's info) the 2071 * INIT should start after the cookie-echo header struct (chunk 2072 * header, state cookie header struct) 2073 */ 2074 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2075 init_cp = (struct sctp_init_chunk *) 2076 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2077 (uint8_t *) & init_buf); 2078 if (init_cp == NULL) { 2079 /* could not pull a INIT chunk in cookie */ 2080 SCTPDBG(SCTP_DEBUG_INPUT1, 2081 "process_cookie_new: could not pull INIT chunk hdr\n"); 2082 return (NULL); 2083 } 2084 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2085 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2086 return (NULL); 2087 } 2088 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2089 /* 2090 * find and validate the INIT-ACK chunk in the cookie (my info) the 2091 * INIT-ACK follows the INIT chunk 2092 */ 2093 initack_cp = (struct sctp_init_ack_chunk *) 2094 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2095 (uint8_t *) & initack_buf); 2096 if (initack_cp == NULL) { 2097 /* could not pull INIT-ACK chunk in cookie */ 2098 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2099 return (NULL); 2100 } 2101 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2102 return (NULL); 2103 } 2104 /* 2105 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2106 * "initack_limit" value. This is because the chk_length field 2107 * includes the length of the cookie, but the cookie is omitted when 2108 * the INIT and INIT_ACK are tacked onto the cookie... 2109 */ 2110 initack_limit = offset + cookie_len; 2111 2112 /* 2113 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2114 * and popluate 2115 */ 2116 2117 /* 2118 * Here we do a trick, we set in NULL for the proc/thread argument. 2119 * We do this since in effect we only use the p argument when the 2120 * socket is unbound and we must do an implicit bind. Since we are 2121 * getting a cookie, we cannot be unbound. 2122 */ 2123 stcb = sctp_aloc_assoc(inp, init_src, &error, 2124 ntohl(initack_cp->init.initiate_tag), vrf_id, 2125 ntohs(initack_cp->init.num_outbound_streams), 2126 port, 2127 (struct thread *)NULL 2128 ); 2129 if (stcb == NULL) { 2130 struct mbuf *op_err; 2131 2132 /* memory problem? */ 2133 SCTPDBG(SCTP_DEBUG_INPUT1, 2134 "process_cookie_new: no room for another TCB!\n"); 2135 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2136 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2137 src, dst, sh, op_err, 2138 mflowtype, mflowid, 2139 vrf_id, port); 2140 return (NULL); 2141 } 2142 /* get the correct sctp_nets */ 2143 if (netp) 2144 *netp = sctp_findnet(stcb, init_src); 2145 2146 asoc = &stcb->asoc; 2147 /* get scope variables out of cookie */ 2148 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2149 asoc->scope.site_scope = cookie->site_scope; 2150 asoc->scope.local_scope = cookie->local_scope; 2151 asoc->scope.loopback_scope = cookie->loopback_scope; 2152 2153 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2154 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2155 struct mbuf *op_err; 2156 2157 /* 2158 * Houston we have a problem. The EP changed while the 2159 * cookie was in flight. Only recourse is to abort the 2160 * association. 2161 */ 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2164 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2165 src, dst, sh, op_err, 2166 mflowtype, mflowid, 2167 vrf_id, port); 2168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2169 SCTP_TCB_UNLOCK(stcb); 2170 SCTP_SOCKET_LOCK(so, 1); 2171 SCTP_TCB_LOCK(stcb); 2172 #endif 2173 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2174 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2175 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2176 SCTP_SOCKET_UNLOCK(so, 1); 2177 #endif 2178 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2179 return (NULL); 2180 } 2181 /* process the INIT-ACK info (my info) */ 2182 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2183 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2184 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2185 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2186 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2187 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2188 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2189 asoc->str_reset_seq_in = asoc->init_seq_number; 2190 2191 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2192 2193 /* process the INIT info (peer's info) */ 2194 if (netp) 2195 retval = sctp_process_init(init_cp, stcb); 2196 else 2197 retval = 0; 2198 if (retval < 0) { 2199 atomic_add_int(&stcb->asoc.refcnt, 1); 2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2201 SCTP_TCB_UNLOCK(stcb); 2202 SCTP_SOCKET_LOCK(so, 1); 2203 SCTP_TCB_LOCK(stcb); 2204 #endif 2205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2206 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2207 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209 #endif 2210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2211 return (NULL); 2212 } 2213 /* load all addresses */ 2214 if (sctp_load_addresses_from_init(stcb, m, 2215 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2216 src, dst, init_src, port)) { 2217 atomic_add_int(&stcb->asoc.refcnt, 1); 2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2219 SCTP_TCB_UNLOCK(stcb); 2220 SCTP_SOCKET_LOCK(so, 1); 2221 SCTP_TCB_LOCK(stcb); 2222 #endif 2223 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2224 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2225 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2226 SCTP_SOCKET_UNLOCK(so, 1); 2227 #endif 2228 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2229 return (NULL); 2230 } 2231 /* 2232 * verify any preceding AUTH chunk that was skipped 2233 */ 2234 /* pull the local authentication parameters from the cookie/init-ack */ 2235 sctp_auth_get_cookie_params(stcb, m, 2236 initack_offset + sizeof(struct sctp_init_ack_chunk), 2237 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2238 if (auth_skipped) { 2239 struct sctp_auth_chunk *auth; 2240 2241 auth = (struct sctp_auth_chunk *) 2242 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2243 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2244 /* auth HMAC failed, dump the assoc and packet */ 2245 SCTPDBG(SCTP_DEBUG_AUTH1, 2246 "COOKIE-ECHO: AUTH failed\n"); 2247 atomic_add_int(&stcb->asoc.refcnt, 1); 2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2249 SCTP_TCB_UNLOCK(stcb); 2250 SCTP_SOCKET_LOCK(so, 1); 2251 SCTP_TCB_LOCK(stcb); 2252 #endif 2253 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2254 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2256 SCTP_SOCKET_UNLOCK(so, 1); 2257 #endif 2258 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2259 return (NULL); 2260 } else { 2261 /* remaining chunks checked... good to go */ 2262 stcb->asoc.authenticated = 1; 2263 } 2264 } 2265 /* update current state */ 2266 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2267 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2268 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2269 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2270 stcb->sctp_ep, stcb, asoc->primary_destination); 2271 } 2272 sctp_stop_all_cookie_timers(stcb); 2273 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2274 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2275 2276 /* 2277 * if we're doing ASCONFs, check to see if we have any new local 2278 * addresses that need to get added to the peer (eg. addresses 2279 * changed while cookie echo in flight). This needs to be done 2280 * after we go to the OPEN state to do the correct asconf 2281 * processing. else, make sure we have the correct addresses in our 2282 * lists 2283 */ 2284 2285 /* warning, we re-use sin, sin6, sa_store here! */ 2286 /* pull in local_address (our "from" address) */ 2287 switch (cookie->laddr_type) { 2288 #ifdef INET 2289 case SCTP_IPV4_ADDRESS: 2290 /* source addr is IPv4 */ 2291 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2292 store.sin.sin_family = AF_INET; 2293 store.sin.sin_len = sizeof(struct sockaddr_in); 2294 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2295 break; 2296 #endif 2297 #ifdef INET6 2298 case SCTP_IPV6_ADDRESS: 2299 /* source addr is IPv6 */ 2300 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2301 store.sin6.sin6_family = AF_INET6; 2302 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2303 store.sin6.sin6_scope_id = cookie->scope_id; 2304 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2305 break; 2306 #endif 2307 default: 2308 atomic_add_int(&stcb->asoc.refcnt, 1); 2309 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2310 SCTP_TCB_UNLOCK(stcb); 2311 SCTP_SOCKET_LOCK(so, 1); 2312 SCTP_TCB_LOCK(stcb); 2313 #endif 2314 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2315 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2316 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2317 SCTP_SOCKET_UNLOCK(so, 1); 2318 #endif 2319 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2320 return (NULL); 2321 } 2322 2323 /* set up to notify upper layer */ 2324 *notification = SCTP_NOTIFY_ASSOC_UP; 2325 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2326 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2327 (inp->sctp_socket->so_qlimit == 0)) { 2328 /* 2329 * This is an endpoint that called connect() how it got a 2330 * cookie that is NEW is a bit of a mystery. It must be that 2331 * the INIT was sent, but before it got there.. a complete 2332 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2333 * should have went to the other code.. not here.. oh well.. 2334 * a bit of protection is worth having.. 2335 */ 2336 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2337 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2338 atomic_add_int(&stcb->asoc.refcnt, 1); 2339 SCTP_TCB_UNLOCK(stcb); 2340 SCTP_SOCKET_LOCK(so, 1); 2341 SCTP_TCB_LOCK(stcb); 2342 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2343 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2344 SCTP_SOCKET_UNLOCK(so, 1); 2345 return (NULL); 2346 } 2347 #endif 2348 soisconnected(stcb->sctp_socket); 2349 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2350 SCTP_SOCKET_UNLOCK(so, 1); 2351 #endif 2352 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2353 (inp->sctp_socket->so_qlimit)) { 2354 /* 2355 * We don't want to do anything with this one. Since it is 2356 * the listening guy. The timer will get started for 2357 * accepted connections in the caller. 2358 */ 2359 ; 2360 } 2361 /* since we did not send a HB make sure we don't double things */ 2362 if ((netp) && (*netp)) 2363 (*netp)->hb_responded = 1; 2364 2365 if (stcb->asoc.sctp_autoclose_ticks && 2366 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2367 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2368 } 2369 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2370 if ((netp != NULL) && (*netp != NULL)) { 2371 /* calculate the RTT and set the encaps port */ 2372 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2373 &cookie->time_entered, sctp_align_unsafe_makecopy, 2374 SCTP_RTT_FROM_NON_DATA); 2375 } 2376 /* respond with a COOKIE-ACK */ 2377 sctp_send_cookie_ack(stcb); 2378 2379 /* 2380 * check the address lists for any ASCONFs that need to be sent 2381 * AFTER the cookie-ack is sent 2382 */ 2383 sctp_check_address_list(stcb, m, 2384 initack_offset + sizeof(struct sctp_init_ack_chunk), 2385 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2386 &store.sa, cookie->local_scope, cookie->site_scope, 2387 cookie->ipv4_scope, cookie->loopback_scope); 2388 2389 2390 return (stcb); 2391 } 2392 2393 /* 2394 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2395 * we NEED to make sure we are not already using the vtag. If so we 2396 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2397 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2398 SCTP_BASE_INFO(hashasocmark))]; 2399 LIST_FOREACH(stcb, head, sctp_asocs) { 2400 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2401 -- SEND ABORT - TRY AGAIN -- 2402 } 2403 } 2404 */ 2405 2406 /* 2407 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2408 * existing (non-NULL) TCB 2409 */ 2410 static struct mbuf * 2411 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2412 struct sockaddr *src, struct sockaddr *dst, 2413 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2414 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2415 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2416 struct sctp_tcb **locked_tcb, 2417 uint8_t mflowtype, uint32_t mflowid, 2418 uint32_t vrf_id, uint16_t port) 2419 { 2420 struct sctp_state_cookie *cookie; 2421 struct sctp_tcb *l_stcb = *stcb; 2422 struct sctp_inpcb *l_inp; 2423 struct sockaddr *to; 2424 struct sctp_pcb *ep; 2425 struct mbuf *m_sig; 2426 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2427 uint8_t *sig; 2428 uint8_t cookie_ok = 0; 2429 unsigned int sig_offset, cookie_offset; 2430 unsigned int cookie_len; 2431 struct timeval now; 2432 struct timeval time_expires; 2433 int notification = 0; 2434 struct sctp_nets *netl; 2435 int had_a_existing_tcb = 0; 2436 int send_int_conf = 0; 2437 2438 #ifdef INET 2439 struct sockaddr_in sin; 2440 2441 #endif 2442 #ifdef INET6 2443 struct sockaddr_in6 sin6; 2444 2445 #endif 2446 2447 SCTPDBG(SCTP_DEBUG_INPUT2, 2448 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2449 2450 if (inp_p == NULL) { 2451 return (NULL); 2452 } 2453 cookie = &cp->cookie; 2454 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2455 cookie_len = ntohs(cp->ch.chunk_length); 2456 2457 if ((cookie->peerport != sh->src_port) || 2458 (cookie->myport != sh->dest_port) || 2459 (cookie->my_vtag != sh->v_tag)) { 2460 /* 2461 * invalid ports or bad tag. Note that we always leave the 2462 * v_tag in the header in network order and when we stored 2463 * it in the my_vtag slot we also left it in network order. 2464 * This maintains the match even though it may be in the 2465 * opposite byte order of the machine :-> 2466 */ 2467 return (NULL); 2468 } 2469 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2470 sizeof(struct sctp_init_chunk) + 2471 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2472 /* cookie too small */ 2473 return (NULL); 2474 } 2475 /* 2476 * split off the signature into its own mbuf (since it should not be 2477 * calculated in the sctp_hmac_m() call). 2478 */ 2479 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2480 m_sig = m_split(m, sig_offset, M_NOWAIT); 2481 if (m_sig == NULL) { 2482 /* out of memory or ?? */ 2483 return (NULL); 2484 } 2485 #ifdef SCTP_MBUF_LOGGING 2486 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2487 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2488 } 2489 #endif 2490 2491 /* 2492 * compute the signature/digest for the cookie 2493 */ 2494 ep = &(*inp_p)->sctp_ep; 2495 l_inp = *inp_p; 2496 if (l_stcb) { 2497 SCTP_TCB_UNLOCK(l_stcb); 2498 } 2499 SCTP_INP_RLOCK(l_inp); 2500 if (l_stcb) { 2501 SCTP_TCB_LOCK(l_stcb); 2502 } 2503 /* which cookie is it? */ 2504 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2505 (ep->current_secret_number != ep->last_secret_number)) { 2506 /* it's the old cookie */ 2507 (void)sctp_hmac_m(SCTP_HMAC, 2508 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2509 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2510 } else { 2511 /* it's the current cookie */ 2512 (void)sctp_hmac_m(SCTP_HMAC, 2513 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2514 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2515 } 2516 /* get the signature */ 2517 SCTP_INP_RUNLOCK(l_inp); 2518 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2519 if (sig == NULL) { 2520 /* couldn't find signature */ 2521 sctp_m_freem(m_sig); 2522 return (NULL); 2523 } 2524 /* compare the received digest with the computed digest */ 2525 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2526 /* try the old cookie? */ 2527 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2528 (ep->current_secret_number != ep->last_secret_number)) { 2529 /* compute digest with old */ 2530 (void)sctp_hmac_m(SCTP_HMAC, 2531 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2532 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2533 /* compare */ 2534 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2535 cookie_ok = 1; 2536 } 2537 } else { 2538 cookie_ok = 1; 2539 } 2540 2541 /* 2542 * Now before we continue we must reconstruct our mbuf so that 2543 * normal processing of any other chunks will work. 2544 */ 2545 { 2546 struct mbuf *m_at; 2547 2548 m_at = m; 2549 while (SCTP_BUF_NEXT(m_at) != NULL) { 2550 m_at = SCTP_BUF_NEXT(m_at); 2551 } 2552 SCTP_BUF_NEXT(m_at) = m_sig; 2553 } 2554 2555 if (cookie_ok == 0) { 2556 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2557 SCTPDBG(SCTP_DEBUG_INPUT2, 2558 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2559 (uint32_t) offset, cookie_offset, sig_offset); 2560 return (NULL); 2561 } 2562 /* 2563 * check the cookie timestamps to be sure it's not stale 2564 */ 2565 (void)SCTP_GETTIME_TIMEVAL(&now); 2566 /* Expire time is in Ticks, so we convert to seconds */ 2567 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2568 time_expires.tv_usec = cookie->time_entered.tv_usec; 2569 /* 2570 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2571 * is undefined. 2572 */ 2573 if (timevalcmp(&now, &time_expires, >)) { 2574 /* cookie is stale! */ 2575 struct mbuf *op_err; 2576 struct sctp_error_stale_cookie *cause; 2577 uint32_t tim; 2578 2579 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2580 0, M_NOWAIT, 1, MT_DATA); 2581 if (op_err == NULL) { 2582 /* FOOBAR */ 2583 return (NULL); 2584 } 2585 /* Set the len */ 2586 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2587 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2588 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2589 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2590 (sizeof(uint32_t)))); 2591 /* seconds to usec */ 2592 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2593 /* add in usec */ 2594 if (tim == 0) 2595 tim = now.tv_usec - cookie->time_entered.tv_usec; 2596 cause->stale_time = htonl(tim); 2597 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2598 mflowtype, mflowid, l_inp->fibnum, 2599 vrf_id, port); 2600 return (NULL); 2601 } 2602 /* 2603 * Now we must see with the lookup address if we have an existing 2604 * asoc. This will only happen if we were in the COOKIE-WAIT state 2605 * and a INIT collided with us and somewhere the peer sent the 2606 * cookie on another address besides the single address our assoc 2607 * had for him. In this case we will have one of the tie-tags set at 2608 * least AND the address field in the cookie can be used to look it 2609 * up. 2610 */ 2611 to = NULL; 2612 switch (cookie->addr_type) { 2613 #ifdef INET6 2614 case SCTP_IPV6_ADDRESS: 2615 memset(&sin6, 0, sizeof(sin6)); 2616 sin6.sin6_family = AF_INET6; 2617 sin6.sin6_len = sizeof(sin6); 2618 sin6.sin6_port = sh->src_port; 2619 sin6.sin6_scope_id = cookie->scope_id; 2620 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2621 sizeof(sin6.sin6_addr.s6_addr)); 2622 to = (struct sockaddr *)&sin6; 2623 break; 2624 #endif 2625 #ifdef INET 2626 case SCTP_IPV4_ADDRESS: 2627 memset(&sin, 0, sizeof(sin)); 2628 sin.sin_family = AF_INET; 2629 sin.sin_len = sizeof(sin); 2630 sin.sin_port = sh->src_port; 2631 sin.sin_addr.s_addr = cookie->address[0]; 2632 to = (struct sockaddr *)&sin; 2633 break; 2634 #endif 2635 default: 2636 /* This should not happen */ 2637 return (NULL); 2638 } 2639 if (*stcb == NULL) { 2640 /* Yep, lets check */ 2641 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2642 if (*stcb == NULL) { 2643 /* 2644 * We should have only got back the same inp. If we 2645 * got back a different ep we have a problem. The 2646 * original findep got back l_inp and now 2647 */ 2648 if (l_inp != *inp_p) { 2649 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2650 } 2651 } else { 2652 if (*locked_tcb == NULL) { 2653 /* 2654 * In this case we found the assoc only 2655 * after we locked the create lock. This 2656 * means we are in a colliding case and we 2657 * must make sure that we unlock the tcb if 2658 * its one of the cases where we throw away 2659 * the incoming packets. 2660 */ 2661 *locked_tcb = *stcb; 2662 2663 /* 2664 * We must also increment the inp ref count 2665 * since the ref_count flags was set when we 2666 * did not find the TCB, now we found it 2667 * which reduces the refcount.. we must 2668 * raise it back out to balance it all :-) 2669 */ 2670 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2671 if ((*stcb)->sctp_ep != l_inp) { 2672 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2673 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2674 } 2675 } 2676 } 2677 } 2678 cookie_len -= SCTP_SIGNATURE_SIZE; 2679 if (*stcb == NULL) { 2680 /* this is the "normal" case... get a new TCB */ 2681 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2682 cookie, cookie_len, *inp_p, 2683 netp, to, ¬ification, 2684 auth_skipped, auth_offset, auth_len, 2685 mflowtype, mflowid, 2686 vrf_id, port); 2687 } else { 2688 /* this is abnormal... cookie-echo on existing TCB */ 2689 had_a_existing_tcb = 1; 2690 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2691 src, dst, sh, 2692 cookie, cookie_len, *inp_p, *stcb, netp, to, 2693 ¬ification, auth_skipped, auth_offset, auth_len, 2694 mflowtype, mflowid, 2695 vrf_id, port); 2696 } 2697 2698 if (*stcb == NULL) { 2699 /* still no TCB... must be bad cookie-echo */ 2700 return (NULL); 2701 } 2702 if (*netp != NULL) { 2703 (*netp)->flowtype = mflowtype; 2704 (*netp)->flowid = mflowid; 2705 } 2706 /* 2707 * Ok, we built an association so confirm the address we sent the 2708 * INIT-ACK to. 2709 */ 2710 netl = sctp_findnet(*stcb, to); 2711 /* 2712 * This code should in theory NOT run but 2713 */ 2714 if (netl == NULL) { 2715 /* TSNH! Huh, why do I need to add this address here? */ 2716 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2717 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2718 return (NULL); 2719 } 2720 netl = sctp_findnet(*stcb, to); 2721 } 2722 if (netl) { 2723 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2724 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2725 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2726 netl); 2727 send_int_conf = 1; 2728 } 2729 } 2730 sctp_start_net_timers(*stcb); 2731 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2732 if (!had_a_existing_tcb || 2733 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2734 /* 2735 * If we have a NEW cookie or the connect never 2736 * reached the connected state during collision we 2737 * must do the TCP accept thing. 2738 */ 2739 struct socket *so, *oso; 2740 struct sctp_inpcb *inp; 2741 2742 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2743 /* 2744 * For a restart we will keep the same 2745 * socket, no need to do anything. I THINK!! 2746 */ 2747 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2748 if (send_int_conf) { 2749 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2750 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2751 } 2752 return (m); 2753 } 2754 oso = (*inp_p)->sctp_socket; 2755 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2756 SCTP_TCB_UNLOCK((*stcb)); 2757 CURVNET_SET(oso->so_vnet); 2758 so = sonewconn(oso, 0 2759 ); 2760 CURVNET_RESTORE(); 2761 SCTP_TCB_LOCK((*stcb)); 2762 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2763 2764 if (so == NULL) { 2765 struct mbuf *op_err; 2766 2767 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2768 struct socket *pcb_so; 2769 2770 #endif 2771 /* Too many sockets */ 2772 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2773 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2774 sctp_abort_association(*inp_p, NULL, m, iphlen, 2775 src, dst, sh, op_err, 2776 mflowtype, mflowid, 2777 vrf_id, port); 2778 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2779 pcb_so = SCTP_INP_SO(*inp_p); 2780 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2781 SCTP_TCB_UNLOCK((*stcb)); 2782 SCTP_SOCKET_LOCK(pcb_so, 1); 2783 SCTP_TCB_LOCK((*stcb)); 2784 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2785 #endif 2786 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2787 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2788 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2789 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2790 #endif 2791 return (NULL); 2792 } 2793 inp = (struct sctp_inpcb *)so->so_pcb; 2794 SCTP_INP_INCR_REF(inp); 2795 /* 2796 * We add the unbound flag here so that if we get an 2797 * soabort() before we get the move_pcb done, we 2798 * will properly cleanup. 2799 */ 2800 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2801 SCTP_PCB_FLAGS_CONNECTED | 2802 SCTP_PCB_FLAGS_IN_TCPPOOL | 2803 SCTP_PCB_FLAGS_UNBOUND | 2804 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2805 SCTP_PCB_FLAGS_DONT_WAKE); 2806 inp->sctp_features = (*inp_p)->sctp_features; 2807 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2808 inp->sctp_socket = so; 2809 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2810 inp->max_cwnd = (*inp_p)->max_cwnd; 2811 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2812 inp->ecn_supported = (*inp_p)->ecn_supported; 2813 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2814 inp->auth_supported = (*inp_p)->auth_supported; 2815 inp->asconf_supported = (*inp_p)->asconf_supported; 2816 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2817 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2818 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2819 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2820 inp->sctp_context = (*inp_p)->sctp_context; 2821 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2822 inp->fibnum = (*inp_p)->fibnum; 2823 inp->inp_starting_point_for_iterator = NULL; 2824 /* 2825 * copy in the authentication parameters from the 2826 * original endpoint 2827 */ 2828 if (inp->sctp_ep.local_hmacs) 2829 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2830 inp->sctp_ep.local_hmacs = 2831 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2832 if (inp->sctp_ep.local_auth_chunks) 2833 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2834 inp->sctp_ep.local_auth_chunks = 2835 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2836 2837 /* 2838 * Now we must move it from one hash table to 2839 * another and get the tcb in the right place. 2840 */ 2841 2842 /* 2843 * This is where the one-2-one socket is put into 2844 * the accept state waiting for the accept! 2845 */ 2846 if (*stcb) { 2847 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2848 } 2849 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2850 2851 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2852 SCTP_TCB_UNLOCK((*stcb)); 2853 2854 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2855 0); 2856 SCTP_TCB_LOCK((*stcb)); 2857 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2858 2859 2860 /* 2861 * now we must check to see if we were aborted while 2862 * the move was going on and the lock/unlock 2863 * happened. 2864 */ 2865 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2866 /* 2867 * yep it was, we leave the assoc attached 2868 * to the socket since the sctp_inpcb_free() 2869 * call will send an abort for us. 2870 */ 2871 SCTP_INP_DECR_REF(inp); 2872 return (NULL); 2873 } 2874 SCTP_INP_DECR_REF(inp); 2875 /* Switch over to the new guy */ 2876 *inp_p = inp; 2877 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2878 if (send_int_conf) { 2879 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2880 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2881 } 2882 /* 2883 * Pull it from the incomplete queue and wake the 2884 * guy 2885 */ 2886 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2887 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2888 SCTP_TCB_UNLOCK((*stcb)); 2889 SCTP_SOCKET_LOCK(so, 1); 2890 #endif 2891 soisconnected(so); 2892 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2893 SCTP_TCB_LOCK((*stcb)); 2894 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2895 SCTP_SOCKET_UNLOCK(so, 1); 2896 #endif 2897 return (m); 2898 } 2899 } 2900 if (notification) { 2901 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2902 } 2903 if (send_int_conf) { 2904 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2905 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2906 } 2907 return (m); 2908 } 2909 2910 static void 2911 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2912 struct sctp_tcb *stcb, struct sctp_nets *net) 2913 { 2914 /* cp must not be used, others call this without a c-ack :-) */ 2915 struct sctp_association *asoc; 2916 2917 SCTPDBG(SCTP_DEBUG_INPUT2, 2918 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2919 if ((stcb == NULL) || (net == NULL)) { 2920 return; 2921 } 2922 asoc = &stcb->asoc; 2923 2924 sctp_stop_all_cookie_timers(stcb); 2925 /* process according to association state */ 2926 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2927 /* state change only needed when I am in right state */ 2928 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2929 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2930 sctp_start_net_timers(stcb); 2931 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2932 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2933 stcb->sctp_ep, stcb, asoc->primary_destination); 2934 2935 } 2936 /* update RTO */ 2937 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2938 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2939 if (asoc->overall_error_count == 0) { 2940 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2941 &asoc->time_entered, sctp_align_safe_nocopy, 2942 SCTP_RTT_FROM_NON_DATA); 2943 } 2944 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2945 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2946 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2947 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2948 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2949 struct socket *so; 2950 2951 #endif 2952 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2953 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2954 so = SCTP_INP_SO(stcb->sctp_ep); 2955 atomic_add_int(&stcb->asoc.refcnt, 1); 2956 SCTP_TCB_UNLOCK(stcb); 2957 SCTP_SOCKET_LOCK(so, 1); 2958 SCTP_TCB_LOCK(stcb); 2959 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2960 #endif 2961 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2962 soisconnected(stcb->sctp_socket); 2963 } 2964 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2965 SCTP_SOCKET_UNLOCK(so, 1); 2966 #endif 2967 } 2968 /* 2969 * since we did not send a HB make sure we don't double 2970 * things 2971 */ 2972 net->hb_responded = 1; 2973 2974 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2975 /* 2976 * We don't need to do the asconf thing, nor hb or 2977 * autoclose if the socket is closed. 2978 */ 2979 goto closed_socket; 2980 } 2981 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2982 stcb, net); 2983 2984 2985 if (stcb->asoc.sctp_autoclose_ticks && 2986 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2987 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2988 stcb->sctp_ep, stcb, NULL); 2989 } 2990 /* 2991 * send ASCONF if parameters are pending and ASCONFs are 2992 * allowed (eg. addresses changed when init/cookie echo were 2993 * in flight) 2994 */ 2995 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2996 (stcb->asoc.asconf_supported == 1) && 2997 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2998 #ifdef SCTP_TIMER_BASED_ASCONF 2999 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3000 stcb->sctp_ep, stcb, 3001 stcb->asoc.primary_destination); 3002 #else 3003 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3004 SCTP_ADDR_NOT_LOCKED); 3005 #endif 3006 } 3007 } 3008 closed_socket: 3009 /* Toss the cookie if I can */ 3010 sctp_toss_old_cookies(stcb, asoc); 3011 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3012 /* Restart the timer if we have pending data */ 3013 struct sctp_tmit_chunk *chk; 3014 3015 chk = TAILQ_FIRST(&asoc->sent_queue); 3016 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3017 } 3018 } 3019 3020 static void 3021 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3022 struct sctp_tcb *stcb) 3023 { 3024 struct sctp_nets *net; 3025 struct sctp_tmit_chunk *lchk; 3026 struct sctp_ecne_chunk bkup; 3027 uint8_t override_bit; 3028 uint32_t tsn, window_data_tsn; 3029 int len; 3030 unsigned int pkt_cnt; 3031 3032 len = ntohs(cp->ch.chunk_length); 3033 if ((len != sizeof(struct sctp_ecne_chunk)) && 3034 (len != sizeof(struct old_sctp_ecne_chunk))) { 3035 return; 3036 } 3037 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3038 /* Its the old format */ 3039 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3040 bkup.num_pkts_since_cwr = htonl(1); 3041 cp = &bkup; 3042 } 3043 SCTP_STAT_INCR(sctps_recvecne); 3044 tsn = ntohl(cp->tsn); 3045 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3046 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3047 if (lchk == NULL) { 3048 window_data_tsn = stcb->asoc.sending_seq - 1; 3049 } else { 3050 window_data_tsn = lchk->rec.data.TSN_seq; 3051 } 3052 3053 /* Find where it was sent to if possible. */ 3054 net = NULL; 3055 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3056 if (lchk->rec.data.TSN_seq == tsn) { 3057 net = lchk->whoTo; 3058 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3059 break; 3060 } 3061 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3062 break; 3063 } 3064 } 3065 if (net == NULL) { 3066 /* 3067 * What to do. A previous send of a CWR was possibly lost. 3068 * See how old it is, we may have it marked on the actual 3069 * net. 3070 */ 3071 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3072 if (tsn == net->last_cwr_tsn) { 3073 /* Found him, send it off */ 3074 break; 3075 } 3076 } 3077 if (net == NULL) { 3078 /* 3079 * If we reach here, we need to send a special CWR 3080 * that says hey, we did this a long time ago and 3081 * you lost the response. 3082 */ 3083 net = TAILQ_FIRST(&stcb->asoc.nets); 3084 if (net == NULL) { 3085 /* TSNH */ 3086 return; 3087 } 3088 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3089 } else { 3090 override_bit = 0; 3091 } 3092 } else { 3093 override_bit = 0; 3094 } 3095 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3096 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3097 /* 3098 * JRS - Use the congestion control given in the pluggable 3099 * CC module 3100 */ 3101 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3102 /* 3103 * We reduce once every RTT. So we will only lower cwnd at 3104 * the next sending seq i.e. the window_data_tsn 3105 */ 3106 net->cwr_window_tsn = window_data_tsn; 3107 net->ecn_ce_pkt_cnt += pkt_cnt; 3108 net->lost_cnt = pkt_cnt; 3109 net->last_cwr_tsn = tsn; 3110 } else { 3111 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3112 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3113 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3114 /* 3115 * Another loss in the same window update how many 3116 * marks/packets lost we have had. 3117 */ 3118 int cnt = 1; 3119 3120 if (pkt_cnt > net->lost_cnt) { 3121 /* Should be the case */ 3122 cnt = (pkt_cnt - net->lost_cnt); 3123 net->ecn_ce_pkt_cnt += cnt; 3124 } 3125 net->lost_cnt = pkt_cnt; 3126 net->last_cwr_tsn = tsn; 3127 /* 3128 * Most CC functions will ignore this call, since we 3129 * are in-window yet of the initial CE the peer saw. 3130 */ 3131 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3132 } 3133 } 3134 /* 3135 * We always send a CWR this way if our previous one was lost our 3136 * peer will get an update, or if it is not time again to reduce we 3137 * still get the cwr to the peer. Note we set the override when we 3138 * could not find the TSN on the chunk or the destination network. 3139 */ 3140 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3141 } 3142 3143 static void 3144 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3145 { 3146 /* 3147 * Here we get a CWR from the peer. We must look in the outqueue and 3148 * make sure that we have a covered ECNE in the control chunk part. 3149 * If so remove it. 3150 */ 3151 struct sctp_tmit_chunk *chk; 3152 struct sctp_ecne_chunk *ecne; 3153 int override; 3154 uint32_t cwr_tsn; 3155 3156 cwr_tsn = ntohl(cp->tsn); 3157 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3158 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3159 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3160 continue; 3161 } 3162 if ((override == 0) && (chk->whoTo != net)) { 3163 /* Must be from the right src unless override is set */ 3164 continue; 3165 } 3166 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3167 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3168 /* this covers this ECNE, we can remove it */ 3169 stcb->asoc.ecn_echo_cnt_onq--; 3170 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3171 sctp_next); 3172 sctp_m_freem(chk->data); 3173 chk->data = NULL; 3174 stcb->asoc.ctrl_queue_cnt--; 3175 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3176 if (override == 0) { 3177 break; 3178 } 3179 } 3180 } 3181 } 3182 3183 static void 3184 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3185 struct sctp_tcb *stcb, struct sctp_nets *net) 3186 { 3187 struct sctp_association *asoc; 3188 3189 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3190 struct socket *so; 3191 3192 #endif 3193 3194 SCTPDBG(SCTP_DEBUG_INPUT2, 3195 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3196 if (stcb == NULL) 3197 return; 3198 3199 asoc = &stcb->asoc; 3200 /* process according to association state */ 3201 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3202 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3203 SCTPDBG(SCTP_DEBUG_INPUT2, 3204 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3205 SCTP_TCB_UNLOCK(stcb); 3206 return; 3207 } 3208 /* notify upper layer protocol */ 3209 if (stcb->sctp_socket) { 3210 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3211 } 3212 #ifdef INVARIANTS 3213 if (!TAILQ_EMPTY(&asoc->send_queue) || 3214 !TAILQ_EMPTY(&asoc->sent_queue) || 3215 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3216 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3217 } 3218 #endif 3219 /* stop the timer */ 3220 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3221 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3222 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3223 /* free the TCB */ 3224 SCTPDBG(SCTP_DEBUG_INPUT2, 3225 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3227 so = SCTP_INP_SO(stcb->sctp_ep); 3228 atomic_add_int(&stcb->asoc.refcnt, 1); 3229 SCTP_TCB_UNLOCK(stcb); 3230 SCTP_SOCKET_LOCK(so, 1); 3231 SCTP_TCB_LOCK(stcb); 3232 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3233 #endif 3234 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3235 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3236 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3237 SCTP_SOCKET_UNLOCK(so, 1); 3238 #endif 3239 return; 3240 } 3241 3242 static int 3243 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3244 struct sctp_nets *net, uint8_t flg) 3245 { 3246 switch (desc->chunk_type) { 3247 case SCTP_DATA: 3248 /* find the tsn to resend (possibly */ 3249 { 3250 uint32_t tsn; 3251 struct sctp_tmit_chunk *tp1; 3252 3253 tsn = ntohl(desc->tsn_ifany); 3254 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3255 if (tp1->rec.data.TSN_seq == tsn) { 3256 /* found it */ 3257 break; 3258 } 3259 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3260 /* not found */ 3261 tp1 = NULL; 3262 break; 3263 } 3264 } 3265 if (tp1 == NULL) { 3266 /* 3267 * Do it the other way , aka without paying 3268 * attention to queue seq order. 3269 */ 3270 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3271 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3272 if (tp1->rec.data.TSN_seq == tsn) { 3273 /* found it */ 3274 break; 3275 } 3276 } 3277 } 3278 if (tp1 == NULL) { 3279 SCTP_STAT_INCR(sctps_pdrptsnnf); 3280 } 3281 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3282 uint8_t *ddp; 3283 3284 if (((flg & SCTP_BADCRC) == 0) && 3285 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3286 return (0); 3287 } 3288 if ((stcb->asoc.peers_rwnd == 0) && 3289 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3290 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3291 return (0); 3292 } 3293 if (stcb->asoc.peers_rwnd == 0 && 3294 (flg & SCTP_FROM_MIDDLE_BOX)) { 3295 SCTP_STAT_INCR(sctps_pdrpdizrw); 3296 return (0); 3297 } 3298 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3299 sizeof(struct sctp_data_chunk)); 3300 { 3301 unsigned int iii; 3302 3303 for (iii = 0; iii < sizeof(desc->data_bytes); 3304 iii++) { 3305 if (ddp[iii] != desc->data_bytes[iii]) { 3306 SCTP_STAT_INCR(sctps_pdrpbadd); 3307 return (-1); 3308 } 3309 } 3310 } 3311 3312 if (tp1->do_rtt) { 3313 /* 3314 * this guy had a RTO calculation 3315 * pending on it, cancel it 3316 */ 3317 if (tp1->whoTo->rto_needed == 0) { 3318 tp1->whoTo->rto_needed = 1; 3319 } 3320 tp1->do_rtt = 0; 3321 } 3322 SCTP_STAT_INCR(sctps_pdrpmark); 3323 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3324 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3325 /* 3326 * mark it as if we were doing a FR, since 3327 * we will be getting gap ack reports behind 3328 * the info from the router. 3329 */ 3330 tp1->rec.data.doing_fast_retransmit = 1; 3331 /* 3332 * mark the tsn with what sequences can 3333 * cause a new FR. 3334 */ 3335 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3336 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3337 } else { 3338 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3339 } 3340 3341 /* restart the timer */ 3342 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3343 stcb, tp1->whoTo, 3344 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3345 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3346 stcb, tp1->whoTo); 3347 3348 /* fix counts and things */ 3349 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3350 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3351 tp1->whoTo->flight_size, 3352 tp1->book_size, 3353 (uint32_t) (uintptr_t) stcb, 3354 tp1->rec.data.TSN_seq); 3355 } 3356 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3357 sctp_flight_size_decrease(tp1); 3358 sctp_total_flight_decrease(stcb, tp1); 3359 } 3360 tp1->sent = SCTP_DATAGRAM_RESEND; 3361 } { 3362 /* audit code */ 3363 unsigned int audit; 3364 3365 audit = 0; 3366 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3367 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3368 audit++; 3369 } 3370 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3371 sctp_next) { 3372 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3373 audit++; 3374 } 3375 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3376 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3377 audit, stcb->asoc.sent_queue_retran_cnt); 3378 #ifndef SCTP_AUDITING_ENABLED 3379 stcb->asoc.sent_queue_retran_cnt = audit; 3380 #endif 3381 } 3382 } 3383 } 3384 break; 3385 case SCTP_ASCONF: 3386 { 3387 struct sctp_tmit_chunk *asconf; 3388 3389 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3390 sctp_next) { 3391 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3392 break; 3393 } 3394 } 3395 if (asconf) { 3396 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3397 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3398 asconf->sent = SCTP_DATAGRAM_RESEND; 3399 asconf->snd_count--; 3400 } 3401 } 3402 break; 3403 case SCTP_INITIATION: 3404 /* resend the INIT */ 3405 stcb->asoc.dropped_special_cnt++; 3406 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3407 /* 3408 * If we can get it in, in a few attempts we do 3409 * this, otherwise we let the timer fire. 3410 */ 3411 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3412 stcb, net, 3413 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3414 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3415 } 3416 break; 3417 case SCTP_SELECTIVE_ACK: 3418 case SCTP_NR_SELECTIVE_ACK: 3419 /* resend the sack */ 3420 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3421 break; 3422 case SCTP_HEARTBEAT_REQUEST: 3423 /* resend a demand HB */ 3424 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3425 /* 3426 * Only retransmit if we KNOW we wont destroy the 3427 * tcb 3428 */ 3429 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3430 } 3431 break; 3432 case SCTP_SHUTDOWN: 3433 sctp_send_shutdown(stcb, net); 3434 break; 3435 case SCTP_SHUTDOWN_ACK: 3436 sctp_send_shutdown_ack(stcb, net); 3437 break; 3438 case SCTP_COOKIE_ECHO: 3439 { 3440 struct sctp_tmit_chunk *cookie; 3441 3442 cookie = NULL; 3443 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3444 sctp_next) { 3445 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3446 break; 3447 } 3448 } 3449 if (cookie) { 3450 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3451 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3452 cookie->sent = SCTP_DATAGRAM_RESEND; 3453 sctp_stop_all_cookie_timers(stcb); 3454 } 3455 } 3456 break; 3457 case SCTP_COOKIE_ACK: 3458 sctp_send_cookie_ack(stcb); 3459 break; 3460 case SCTP_ASCONF_ACK: 3461 /* resend last asconf ack */ 3462 sctp_send_asconf_ack(stcb); 3463 break; 3464 case SCTP_IFORWARD_CUM_TSN: 3465 case SCTP_FORWARD_CUM_TSN: 3466 send_forward_tsn(stcb, &stcb->asoc); 3467 break; 3468 /* can't do anything with these */ 3469 case SCTP_PACKET_DROPPED: 3470 case SCTP_INITIATION_ACK: /* this should not happen */ 3471 case SCTP_HEARTBEAT_ACK: 3472 case SCTP_ABORT_ASSOCIATION: 3473 case SCTP_OPERATION_ERROR: 3474 case SCTP_SHUTDOWN_COMPLETE: 3475 case SCTP_ECN_ECHO: 3476 case SCTP_ECN_CWR: 3477 default: 3478 break; 3479 } 3480 return (0); 3481 } 3482 3483 void 3484 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3485 { 3486 uint32_t i; 3487 uint16_t temp; 3488 3489 /* 3490 * We set things to 0xffffffff since this is the last delivered 3491 * sequence and we will be sending in 0 after the reset. 3492 */ 3493 3494 if (number_entries) { 3495 for (i = 0; i < number_entries; i++) { 3496 temp = ntohs(list[i]); 3497 if (temp >= stcb->asoc.streamincnt) { 3498 continue; 3499 } 3500 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffffffff; 3501 } 3502 } else { 3503 list = NULL; 3504 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3505 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 3506 } 3507 } 3508 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3509 } 3510 3511 static void 3512 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3513 { 3514 uint32_t i; 3515 uint16_t temp; 3516 3517 if (number_entries > 0) { 3518 for (i = 0; i < number_entries; i++) { 3519 temp = ntohs(list[i]); 3520 if (temp >= stcb->asoc.streamoutcnt) { 3521 /* no such stream */ 3522 continue; 3523 } 3524 stcb->asoc.strmout[temp].next_sequence_send = 0; 3525 } 3526 } else { 3527 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3528 stcb->asoc.strmout[i].next_sequence_send = 0; 3529 } 3530 } 3531 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3532 } 3533 3534 static void 3535 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3536 { 3537 uint32_t i; 3538 uint16_t temp; 3539 3540 if (number_entries > 0) { 3541 for (i = 0; i < number_entries; i++) { 3542 temp = ntohs(list[i]); 3543 if (temp >= stcb->asoc.streamoutcnt) { 3544 /* no such stream */ 3545 continue; 3546 } 3547 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3548 } 3549 } else { 3550 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3551 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3552 } 3553 } 3554 } 3555 3556 3557 struct sctp_stream_reset_request * 3558 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3559 { 3560 struct sctp_association *asoc; 3561 struct sctp_chunkhdr *ch; 3562 struct sctp_stream_reset_request *r; 3563 struct sctp_tmit_chunk *chk; 3564 int len, clen; 3565 3566 asoc = &stcb->asoc; 3567 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3568 asoc->stream_reset_outstanding = 0; 3569 return (NULL); 3570 } 3571 if (stcb->asoc.str_reset == NULL) { 3572 asoc->stream_reset_outstanding = 0; 3573 return (NULL); 3574 } 3575 chk = stcb->asoc.str_reset; 3576 if (chk->data == NULL) { 3577 return (NULL); 3578 } 3579 if (bchk) { 3580 /* he wants a copy of the chk pointer */ 3581 *bchk = chk; 3582 } 3583 clen = chk->send_size; 3584 ch = mtod(chk->data, struct sctp_chunkhdr *); 3585 r = (struct sctp_stream_reset_request *)(ch + 1); 3586 if (ntohl(r->request_seq) == seq) { 3587 /* found it */ 3588 return (r); 3589 } 3590 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3591 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3592 /* move to the next one, there can only be a max of two */ 3593 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3594 if (ntohl(r->request_seq) == seq) { 3595 return (r); 3596 } 3597 } 3598 /* that seq is not here */ 3599 return (NULL); 3600 } 3601 3602 static void 3603 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3604 { 3605 struct sctp_association *asoc; 3606 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3607 3608 if (stcb->asoc.str_reset == NULL) { 3609 return; 3610 } 3611 asoc = &stcb->asoc; 3612 3613 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3614 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3615 TAILQ_REMOVE(&asoc->control_send_queue, 3616 chk, 3617 sctp_next); 3618 if (chk->data) { 3619 sctp_m_freem(chk->data); 3620 chk->data = NULL; 3621 } 3622 asoc->ctrl_queue_cnt--; 3623 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3624 /* sa_ignore NO_NULL_CHK */ 3625 stcb->asoc.str_reset = NULL; 3626 } 3627 3628 3629 static int 3630 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3631 uint32_t seq, uint32_t action, 3632 struct sctp_stream_reset_response *respin) 3633 { 3634 uint16_t type; 3635 int lparm_len; 3636 struct sctp_association *asoc = &stcb->asoc; 3637 struct sctp_tmit_chunk *chk; 3638 struct sctp_stream_reset_request *req_param; 3639 struct sctp_stream_reset_out_request *req_out_param; 3640 struct sctp_stream_reset_in_request *req_in_param; 3641 uint32_t number_entries; 3642 3643 if (asoc->stream_reset_outstanding == 0) { 3644 /* duplicate */ 3645 return (0); 3646 } 3647 if (seq == stcb->asoc.str_reset_seq_out) { 3648 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3649 if (req_param != NULL) { 3650 stcb->asoc.str_reset_seq_out++; 3651 type = ntohs(req_param->ph.param_type); 3652 lparm_len = ntohs(req_param->ph.param_length); 3653 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3654 int no_clear = 0; 3655 3656 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3657 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3658 asoc->stream_reset_out_is_outstanding = 0; 3659 if (asoc->stream_reset_outstanding) 3660 asoc->stream_reset_outstanding--; 3661 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3662 /* do it */ 3663 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3664 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3665 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3666 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3667 /* 3668 * Set it up so we don't stop 3669 * retransmitting 3670 */ 3671 asoc->stream_reset_outstanding++; 3672 stcb->asoc.str_reset_seq_out--; 3673 asoc->stream_reset_out_is_outstanding = 1; 3674 no_clear = 1; 3675 } else { 3676 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3677 } 3678 if (no_clear == 0) { 3679 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3680 } 3681 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3682 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3683 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3684 if (asoc->stream_reset_outstanding) 3685 asoc->stream_reset_outstanding--; 3686 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3687 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3688 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3689 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3690 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3691 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3692 } 3693 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3694 /* Ok we now may have more streams */ 3695 int num_stream; 3696 3697 num_stream = stcb->asoc.strm_pending_add_size; 3698 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3699 /* TSNH */ 3700 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3701 } 3702 stcb->asoc.strm_pending_add_size = 0; 3703 if (asoc->stream_reset_outstanding) 3704 asoc->stream_reset_outstanding--; 3705 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3706 /* Put the new streams into effect */ 3707 int i; 3708 3709 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3710 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3711 } 3712 asoc->streamoutcnt += num_stream; 3713 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3714 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3715 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3716 SCTP_STREAM_CHANGE_DENIED); 3717 } else { 3718 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3719 SCTP_STREAM_CHANGE_FAILED); 3720 } 3721 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3722 if (asoc->stream_reset_outstanding) 3723 asoc->stream_reset_outstanding--; 3724 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3725 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3726 SCTP_STREAM_CHANGE_DENIED); 3727 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3728 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3729 SCTP_STREAM_CHANGE_FAILED); 3730 } 3731 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3732 /** 3733 * a) Adopt the new in tsn. 3734 * b) reset the map 3735 * c) Adopt the new out-tsn 3736 */ 3737 struct sctp_stream_reset_response_tsn *resp; 3738 struct sctp_forward_tsn_chunk fwdtsn; 3739 int abort_flag = 0; 3740 3741 if (respin == NULL) { 3742 /* huh ? */ 3743 return (0); 3744 } 3745 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3746 return (0); 3747 } 3748 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3749 resp = (struct sctp_stream_reset_response_tsn *)respin; 3750 asoc->stream_reset_outstanding--; 3751 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3752 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3753 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3754 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3755 if (abort_flag) { 3756 return (1); 3757 } 3758 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3759 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3760 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3761 } 3762 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3763 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3764 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3765 3766 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3767 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3768 3769 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3770 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3771 3772 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3773 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3774 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3775 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3776 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3777 SCTP_ASSOC_RESET_DENIED); 3778 } else { 3779 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3780 SCTP_ASSOC_RESET_FAILED); 3781 } 3782 } 3783 /* get rid of the request and get the request flags */ 3784 if (asoc->stream_reset_outstanding == 0) { 3785 sctp_clean_up_stream_reset(stcb); 3786 } 3787 } 3788 } 3789 if (asoc->stream_reset_outstanding == 0) { 3790 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3791 } 3792 return (0); 3793 } 3794 3795 static void 3796 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3797 struct sctp_tmit_chunk *chk, 3798 struct sctp_stream_reset_in_request *req, int trunc) 3799 { 3800 uint32_t seq; 3801 int len, i; 3802 int number_entries; 3803 uint16_t temp; 3804 3805 /* 3806 * peer wants me to send a str-reset to him for my outgoing seq's if 3807 * seq_in is right. 3808 */ 3809 struct sctp_association *asoc = &stcb->asoc; 3810 3811 seq = ntohl(req->request_seq); 3812 if (asoc->str_reset_seq_in == seq) { 3813 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3814 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3815 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3816 } else if (trunc) { 3817 /* Can't do it, since they exceeded our buffer size */ 3818 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3819 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3820 len = ntohs(req->ph.param_length); 3821 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3822 if (number_entries) { 3823 for (i = 0; i < number_entries; i++) { 3824 temp = ntohs(req->list_of_streams[i]); 3825 if (temp >= stcb->asoc.streamoutcnt) { 3826 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3827 goto bad_boy; 3828 } 3829 req->list_of_streams[i] = temp; 3830 } 3831 for (i = 0; i < number_entries; i++) { 3832 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3833 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3834 } 3835 } 3836 } else { 3837 /* Its all */ 3838 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3839 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3840 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3841 } 3842 } 3843 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3844 } else { 3845 /* Can't do it, since we have sent one out */ 3846 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3847 } 3848 bad_boy: 3849 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3850 asoc->str_reset_seq_in++; 3851 } else if (asoc->str_reset_seq_in - 1 == seq) { 3852 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3853 } else if (asoc->str_reset_seq_in - 2 == seq) { 3854 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3855 } else { 3856 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3857 } 3858 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3859 } 3860 3861 static int 3862 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3863 struct sctp_tmit_chunk *chk, 3864 struct sctp_stream_reset_tsn_request *req) 3865 { 3866 /* reset all in and out and update the tsn */ 3867 /* 3868 * A) reset my str-seq's on in and out. B) Select a receive next, 3869 * and set cum-ack to it. Also process this selected number as a 3870 * fwd-tsn as well. C) set in the response my next sending seq. 3871 */ 3872 struct sctp_forward_tsn_chunk fwdtsn; 3873 struct sctp_association *asoc = &stcb->asoc; 3874 int abort_flag = 0; 3875 uint32_t seq; 3876 3877 seq = ntohl(req->request_seq); 3878 if (asoc->str_reset_seq_in == seq) { 3879 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3880 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3881 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3882 } else { 3883 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3884 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3885 fwdtsn.ch.chunk_flags = 0; 3886 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3887 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3888 if (abort_flag) { 3889 return (1); 3890 } 3891 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3892 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3893 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3894 } 3895 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3896 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3897 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3898 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3899 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3900 atomic_add_int(&asoc->sending_seq, 1); 3901 /* save off historical data for retrans */ 3902 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3903 asoc->last_sending_seq[0] = asoc->sending_seq; 3904 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3905 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3906 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3907 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3908 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3909 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3910 } 3911 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3912 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3913 asoc->str_reset_seq_in++; 3914 } else if (asoc->str_reset_seq_in - 1 == seq) { 3915 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3916 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3917 } else if (asoc->str_reset_seq_in - 2 == seq) { 3918 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3919 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3920 } else { 3921 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3922 } 3923 return (0); 3924 } 3925 3926 static void 3927 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3928 struct sctp_tmit_chunk *chk, 3929 struct sctp_stream_reset_out_request *req, int trunc) 3930 { 3931 uint32_t seq, tsn; 3932 int number_entries, len; 3933 struct sctp_association *asoc = &stcb->asoc; 3934 3935 seq = ntohl(req->request_seq); 3936 3937 /* now if its not a duplicate we process it */ 3938 if (asoc->str_reset_seq_in == seq) { 3939 len = ntohs(req->ph.param_length); 3940 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3941 /* 3942 * the sender is resetting, handle the list issue.. we must 3943 * a) verify if we can do the reset, if so no problem b) If 3944 * we can't do the reset we must copy the request. c) queue 3945 * it, and setup the data in processor to trigger it off 3946 * when needed and dequeue all the queued data. 3947 */ 3948 tsn = ntohl(req->send_reset_at_tsn); 3949 3950 /* move the reset action back one */ 3951 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3952 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3953 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3954 } else if (trunc) { 3955 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3956 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3957 /* we can do it now */ 3958 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3959 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3960 } else { 3961 /* 3962 * we must queue it up and thus wait for the TSN's 3963 * to arrive that are at or before tsn 3964 */ 3965 struct sctp_stream_reset_list *liste; 3966 int siz; 3967 3968 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3969 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3970 siz, SCTP_M_STRESET); 3971 if (liste == NULL) { 3972 /* gak out of memory */ 3973 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3974 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3975 return; 3976 } 3977 liste->seq = seq; 3978 liste->tsn = tsn; 3979 liste->number_entries = number_entries; 3980 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3981 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3982 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3983 } 3984 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3985 asoc->str_reset_seq_in++; 3986 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3987 /* 3988 * one seq back, just echo back last action since my 3989 * response was lost. 3990 */ 3991 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3992 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3993 /* 3994 * two seq back, just echo back last action since my 3995 * response was lost. 3996 */ 3997 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3998 } else { 3999 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4000 } 4001 } 4002 4003 static void 4004 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4005 struct sctp_stream_reset_add_strm *str_add) 4006 { 4007 /* 4008 * Peer is requesting to add more streams. If its within our 4009 * max-streams we will allow it. 4010 */ 4011 uint32_t num_stream, i; 4012 uint32_t seq; 4013 struct sctp_association *asoc = &stcb->asoc; 4014 struct sctp_queued_to_read *ctl, *nctl; 4015 4016 /* Get the number. */ 4017 seq = ntohl(str_add->request_seq); 4018 num_stream = ntohs(str_add->number_of_streams); 4019 /* Now what would be the new total? */ 4020 if (asoc->str_reset_seq_in == seq) { 4021 num_stream += stcb->asoc.streamincnt; 4022 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4023 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4024 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4025 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4026 (num_stream > 0xffff)) { 4027 /* We must reject it they ask for to many */ 4028 denied: 4029 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4030 } else { 4031 /* Ok, we can do that :-) */ 4032 struct sctp_stream_in *oldstrm; 4033 4034 /* save off the old */ 4035 oldstrm = stcb->asoc.strmin; 4036 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4037 (num_stream * sizeof(struct sctp_stream_in)), 4038 SCTP_M_STRMI); 4039 if (stcb->asoc.strmin == NULL) { 4040 stcb->asoc.strmin = oldstrm; 4041 goto denied; 4042 } 4043 /* copy off the old data */ 4044 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4045 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4046 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4047 stcb->asoc.strmin[i].stream_no = i; 4048 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4049 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4050 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4051 /* now anything on those queues? */ 4052 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4053 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4054 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4055 } 4056 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4057 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4058 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4059 } 4060 } 4061 /* Init the new streams */ 4062 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4063 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4064 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4065 stcb->asoc.strmin[i].stream_no = i; 4066 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 4067 stcb->asoc.strmin[i].pd_api_started = 0; 4068 stcb->asoc.strmin[i].delivery_started = 0; 4069 } 4070 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4071 /* update the size */ 4072 stcb->asoc.streamincnt = num_stream; 4073 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4074 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4075 } 4076 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4077 asoc->str_reset_seq_in++; 4078 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4079 /* 4080 * one seq back, just echo back last action since my 4081 * response was lost. 4082 */ 4083 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4084 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4085 /* 4086 * two seq back, just echo back last action since my 4087 * response was lost. 4088 */ 4089 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4090 } else { 4091 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4092 4093 } 4094 } 4095 4096 static void 4097 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4098 struct sctp_stream_reset_add_strm *str_add) 4099 { 4100 /* 4101 * Peer is requesting to add more streams. If its within our 4102 * max-streams we will allow it. 4103 */ 4104 uint16_t num_stream; 4105 uint32_t seq; 4106 struct sctp_association *asoc = &stcb->asoc; 4107 4108 /* Get the number. */ 4109 seq = ntohl(str_add->request_seq); 4110 num_stream = ntohs(str_add->number_of_streams); 4111 /* Now what would be the new total? */ 4112 if (asoc->str_reset_seq_in == seq) { 4113 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4114 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4115 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4116 } else if (stcb->asoc.stream_reset_outstanding) { 4117 /* We must reject it we have something pending */ 4118 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4119 } else { 4120 /* Ok, we can do that :-) */ 4121 int mychk; 4122 4123 mychk = stcb->asoc.streamoutcnt; 4124 mychk += num_stream; 4125 if (mychk < 0x10000) { 4126 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4127 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4128 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4129 } 4130 } else { 4131 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4132 } 4133 } 4134 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4135 asoc->str_reset_seq_in++; 4136 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4137 /* 4138 * one seq back, just echo back last action since my 4139 * response was lost. 4140 */ 4141 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4142 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4143 /* 4144 * two seq back, just echo back last action since my 4145 * response was lost. 4146 */ 4147 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4148 } else { 4149 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4150 } 4151 } 4152 4153 #ifdef __GNUC__ 4154 __attribute__((noinline)) 4155 #endif 4156 static int 4157 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4158 struct sctp_chunkhdr *ch_req) 4159 { 4160 uint16_t remaining_length, param_len, ptype; 4161 struct sctp_paramhdr pstore; 4162 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4163 uint32_t seq = 0; 4164 int num_req = 0; 4165 int trunc = 0; 4166 struct sctp_tmit_chunk *chk; 4167 struct sctp_chunkhdr *ch; 4168 struct sctp_paramhdr *ph; 4169 int ret_code = 0; 4170 int num_param = 0; 4171 4172 /* now it may be a reset or a reset-response */ 4173 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4174 4175 /* setup for adding the response */ 4176 sctp_alloc_a_chunk(stcb, chk); 4177 if (chk == NULL) { 4178 return (ret_code); 4179 } 4180 chk->copy_by_ref = 0; 4181 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4182 chk->rec.chunk_id.can_take_data = 0; 4183 chk->flags = 0; 4184 chk->asoc = &stcb->asoc; 4185 chk->no_fr_allowed = 0; 4186 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4187 chk->book_size_scale = 0; 4188 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4189 if (chk->data == NULL) { 4190 strres_nochunk: 4191 if (chk->data) { 4192 sctp_m_freem(chk->data); 4193 chk->data = NULL; 4194 } 4195 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4196 return (ret_code); 4197 } 4198 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4199 4200 /* setup chunk parameters */ 4201 chk->sent = SCTP_DATAGRAM_UNSENT; 4202 chk->snd_count = 0; 4203 chk->whoTo = NULL; 4204 4205 ch = mtod(chk->data, struct sctp_chunkhdr *); 4206 ch->chunk_type = SCTP_STREAM_RESET; 4207 ch->chunk_flags = 0; 4208 ch->chunk_length = htons(chk->send_size); 4209 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4210 offset += sizeof(struct sctp_chunkhdr); 4211 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4212 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4213 if (ph == NULL) { 4214 /* TSNH */ 4215 break; 4216 } 4217 param_len = ntohs(ph->param_length); 4218 if ((param_len > remaining_length) || 4219 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4220 /* bad parameter length */ 4221 break; 4222 } 4223 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4224 (uint8_t *) & cstore); 4225 if (ph == NULL) { 4226 /* TSNH */ 4227 break; 4228 } 4229 ptype = ntohs(ph->param_type); 4230 num_param++; 4231 if (param_len > sizeof(cstore)) { 4232 trunc = 1; 4233 } else { 4234 trunc = 0; 4235 } 4236 if (num_param > SCTP_MAX_RESET_PARAMS) { 4237 /* hit the max of parameters already sorry.. */ 4238 break; 4239 } 4240 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4241 struct sctp_stream_reset_out_request *req_out; 4242 4243 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4244 break; 4245 } 4246 req_out = (struct sctp_stream_reset_out_request *)ph; 4247 num_req++; 4248 if (stcb->asoc.stream_reset_outstanding) { 4249 seq = ntohl(req_out->response_seq); 4250 if (seq == stcb->asoc.str_reset_seq_out) { 4251 /* implicit ack */ 4252 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4253 } 4254 } 4255 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4256 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4257 struct sctp_stream_reset_add_strm *str_add; 4258 4259 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4260 break; 4261 } 4262 str_add = (struct sctp_stream_reset_add_strm *)ph; 4263 num_req++; 4264 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4265 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4266 struct sctp_stream_reset_add_strm *str_add; 4267 4268 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4269 break; 4270 } 4271 str_add = (struct sctp_stream_reset_add_strm *)ph; 4272 num_req++; 4273 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4274 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4275 struct sctp_stream_reset_in_request *req_in; 4276 4277 num_req++; 4278 req_in = (struct sctp_stream_reset_in_request *)ph; 4279 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4280 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4281 struct sctp_stream_reset_tsn_request *req_tsn; 4282 4283 num_req++; 4284 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4285 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4286 ret_code = 1; 4287 goto strres_nochunk; 4288 } 4289 /* no more */ 4290 break; 4291 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4292 struct sctp_stream_reset_response *resp; 4293 uint32_t result; 4294 4295 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4296 break; 4297 } 4298 resp = (struct sctp_stream_reset_response *)ph; 4299 seq = ntohl(resp->response_seq); 4300 result = ntohl(resp->result); 4301 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4302 ret_code = 1; 4303 goto strres_nochunk; 4304 } 4305 } else { 4306 break; 4307 } 4308 offset += SCTP_SIZE32(param_len); 4309 if (remaining_length >= SCTP_SIZE32(param_len)) { 4310 remaining_length -= SCTP_SIZE32(param_len); 4311 } else { 4312 remaining_length = 0; 4313 } 4314 } 4315 if (num_req == 0) { 4316 /* we have no response free the stuff */ 4317 goto strres_nochunk; 4318 } 4319 /* ok we have a chunk to link in */ 4320 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4321 chk, 4322 sctp_next); 4323 stcb->asoc.ctrl_queue_cnt++; 4324 return (ret_code); 4325 } 4326 4327 /* 4328 * Handle a router or endpoints report of a packet loss, there are two ways 4329 * to handle this, either we get the whole packet and must disect it 4330 * ourselves (possibly with truncation and or corruption) or it is a summary 4331 * from a middle box that did the disectting for us. 4332 */ 4333 static void 4334 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4335 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4336 { 4337 uint32_t bottle_bw, on_queue; 4338 uint16_t trunc_len; 4339 unsigned int chlen; 4340 unsigned int at; 4341 struct sctp_chunk_desc desc; 4342 struct sctp_chunkhdr *ch; 4343 4344 chlen = ntohs(cp->ch.chunk_length); 4345 chlen -= sizeof(struct sctp_pktdrop_chunk); 4346 /* XXX possible chlen underflow */ 4347 if (chlen == 0) { 4348 ch = NULL; 4349 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4350 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4351 } else { 4352 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4353 chlen -= sizeof(struct sctphdr); 4354 /* XXX possible chlen underflow */ 4355 memset(&desc, 0, sizeof(desc)); 4356 } 4357 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4358 if (trunc_len > limit) { 4359 trunc_len = limit; 4360 } 4361 /* now the chunks themselves */ 4362 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4363 desc.chunk_type = ch->chunk_type; 4364 /* get amount we need to move */ 4365 at = ntohs(ch->chunk_length); 4366 if (at < sizeof(struct sctp_chunkhdr)) { 4367 /* corrupt chunk, maybe at the end? */ 4368 SCTP_STAT_INCR(sctps_pdrpcrupt); 4369 break; 4370 } 4371 if (trunc_len == 0) { 4372 /* we are supposed to have all of it */ 4373 if (at > chlen) { 4374 /* corrupt skip it */ 4375 SCTP_STAT_INCR(sctps_pdrpcrupt); 4376 break; 4377 } 4378 } else { 4379 /* is there enough of it left ? */ 4380 if (desc.chunk_type == SCTP_DATA) { 4381 if (chlen < (sizeof(struct sctp_data_chunk) + 4382 sizeof(desc.data_bytes))) { 4383 break; 4384 } 4385 } else { 4386 if (chlen < sizeof(struct sctp_chunkhdr)) { 4387 break; 4388 } 4389 } 4390 } 4391 if (desc.chunk_type == SCTP_DATA) { 4392 /* can we get out the tsn? */ 4393 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4394 SCTP_STAT_INCR(sctps_pdrpmbda); 4395 4396 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4397 /* yep */ 4398 struct sctp_data_chunk *dcp; 4399 uint8_t *ddp; 4400 unsigned int iii; 4401 4402 dcp = (struct sctp_data_chunk *)ch; 4403 ddp = (uint8_t *) (dcp + 1); 4404 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4405 desc.data_bytes[iii] = ddp[iii]; 4406 } 4407 desc.tsn_ifany = dcp->dp.tsn; 4408 } else { 4409 /* nope we are done. */ 4410 SCTP_STAT_INCR(sctps_pdrpnedat); 4411 break; 4412 } 4413 } else { 4414 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4415 SCTP_STAT_INCR(sctps_pdrpmbct); 4416 } 4417 4418 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4419 SCTP_STAT_INCR(sctps_pdrppdbrk); 4420 break; 4421 } 4422 if (SCTP_SIZE32(at) > chlen) { 4423 break; 4424 } 4425 chlen -= SCTP_SIZE32(at); 4426 if (chlen < sizeof(struct sctp_chunkhdr)) { 4427 /* done, none left */ 4428 break; 4429 } 4430 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4431 } 4432 /* Now update any rwnd --- possibly */ 4433 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4434 /* From a peer, we get a rwnd report */ 4435 uint32_t a_rwnd; 4436 4437 SCTP_STAT_INCR(sctps_pdrpfehos); 4438 4439 bottle_bw = ntohl(cp->bottle_bw); 4440 on_queue = ntohl(cp->current_onq); 4441 if (bottle_bw && on_queue) { 4442 /* a rwnd report is in here */ 4443 if (bottle_bw > on_queue) 4444 a_rwnd = bottle_bw - on_queue; 4445 else 4446 a_rwnd = 0; 4447 4448 if (a_rwnd == 0) 4449 stcb->asoc.peers_rwnd = 0; 4450 else { 4451 if (a_rwnd > stcb->asoc.total_flight) { 4452 stcb->asoc.peers_rwnd = 4453 a_rwnd - stcb->asoc.total_flight; 4454 } else { 4455 stcb->asoc.peers_rwnd = 0; 4456 } 4457 if (stcb->asoc.peers_rwnd < 4458 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4459 /* SWS sender side engages */ 4460 stcb->asoc.peers_rwnd = 0; 4461 } 4462 } 4463 } 4464 } else { 4465 SCTP_STAT_INCR(sctps_pdrpfmbox); 4466 } 4467 4468 /* now middle boxes in sat networks get a cwnd bump */ 4469 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4470 (stcb->asoc.sat_t3_loss_recovery == 0) && 4471 (stcb->asoc.sat_network)) { 4472 /* 4473 * This is debatable but for sat networks it makes sense 4474 * Note if a T3 timer has went off, we will prohibit any 4475 * changes to cwnd until we exit the t3 loss recovery. 4476 */ 4477 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4478 net, cp, &bottle_bw, &on_queue); 4479 } 4480 } 4481 4482 /* 4483 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4484 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4485 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4486 * length of the complete packet outputs: - length: modified to remaining 4487 * length after control processing - netp: modified to new sctp_nets after 4488 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4489 * bad packet,...) otherwise return the tcb for this packet 4490 */ 4491 #ifdef __GNUC__ 4492 __attribute__((noinline)) 4493 #endif 4494 static struct sctp_tcb * 4495 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4496 struct sockaddr *src, struct sockaddr *dst, 4497 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4498 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4499 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4500 uint32_t vrf_id, uint16_t port) 4501 { 4502 struct sctp_association *asoc; 4503 struct mbuf *op_err; 4504 char msg[SCTP_DIAG_INFO_LEN]; 4505 uint32_t vtag_in; 4506 int num_chunks = 0; /* number of control chunks processed */ 4507 uint32_t chk_length; 4508 int ret; 4509 int abort_no_unlock = 0; 4510 int ecne_seen = 0; 4511 4512 /* 4513 * How big should this be, and should it be alloc'd? Lets try the 4514 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4515 * until we get into jumbo grams and such.. 4516 */ 4517 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4518 struct sctp_tcb *locked_tcb = stcb; 4519 int got_auth = 0; 4520 uint32_t auth_offset = 0, auth_len = 0; 4521 int auth_skipped = 0; 4522 int asconf_cnt = 0; 4523 4524 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4525 struct socket *so; 4526 4527 #endif 4528 4529 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4530 iphlen, *offset, length, (void *)stcb); 4531 4532 /* validate chunk header length... */ 4533 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4534 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4535 ntohs(ch->chunk_length)); 4536 if (locked_tcb) { 4537 SCTP_TCB_UNLOCK(locked_tcb); 4538 } 4539 return (NULL); 4540 } 4541 /* 4542 * validate the verification tag 4543 */ 4544 vtag_in = ntohl(sh->v_tag); 4545 4546 if (locked_tcb) { 4547 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4548 } 4549 if (ch->chunk_type == SCTP_INITIATION) { 4550 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4551 ntohs(ch->chunk_length), vtag_in); 4552 if (vtag_in != 0) { 4553 /* protocol error- silently discard... */ 4554 SCTP_STAT_INCR(sctps_badvtag); 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 return (NULL); 4559 } 4560 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4561 /* 4562 * If there is no stcb, skip the AUTH chunk and process 4563 * later after a stcb is found (to validate the lookup was 4564 * valid. 4565 */ 4566 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4567 (stcb == NULL) && 4568 (inp->auth_supported == 1)) { 4569 /* save this chunk for later processing */ 4570 auth_skipped = 1; 4571 auth_offset = *offset; 4572 auth_len = ntohs(ch->chunk_length); 4573 4574 /* (temporarily) move past this chunk */ 4575 *offset += SCTP_SIZE32(auth_len); 4576 if (*offset >= length) { 4577 /* no more data left in the mbuf chain */ 4578 *offset = length; 4579 if (locked_tcb) { 4580 SCTP_TCB_UNLOCK(locked_tcb); 4581 } 4582 return (NULL); 4583 } 4584 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4585 sizeof(struct sctp_chunkhdr), chunk_buf); 4586 } 4587 if (ch == NULL) { 4588 /* Help */ 4589 *offset = length; 4590 if (locked_tcb) { 4591 SCTP_TCB_UNLOCK(locked_tcb); 4592 } 4593 return (NULL); 4594 } 4595 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4596 goto process_control_chunks; 4597 } 4598 /* 4599 * first check if it's an ASCONF with an unknown src addr we 4600 * need to look inside to find the association 4601 */ 4602 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4603 struct sctp_chunkhdr *asconf_ch = ch; 4604 uint32_t asconf_offset = 0, asconf_len = 0; 4605 4606 /* inp's refcount may be reduced */ 4607 SCTP_INP_INCR_REF(inp); 4608 4609 asconf_offset = *offset; 4610 do { 4611 asconf_len = ntohs(asconf_ch->chunk_length); 4612 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4613 break; 4614 stcb = sctp_findassociation_ep_asconf(m, 4615 *offset, 4616 dst, 4617 sh, &inp, netp, vrf_id); 4618 if (stcb != NULL) 4619 break; 4620 asconf_offset += SCTP_SIZE32(asconf_len); 4621 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4622 sizeof(struct sctp_chunkhdr), chunk_buf); 4623 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4624 if (stcb == NULL) { 4625 /* 4626 * reduce inp's refcount if not reduced in 4627 * sctp_findassociation_ep_asconf(). 4628 */ 4629 SCTP_INP_DECR_REF(inp); 4630 } else { 4631 locked_tcb = stcb; 4632 } 4633 4634 /* now go back and verify any auth chunk to be sure */ 4635 if (auth_skipped && (stcb != NULL)) { 4636 struct sctp_auth_chunk *auth; 4637 4638 auth = (struct sctp_auth_chunk *) 4639 sctp_m_getptr(m, auth_offset, 4640 auth_len, chunk_buf); 4641 got_auth = 1; 4642 auth_skipped = 0; 4643 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4644 auth_offset)) { 4645 /* auth HMAC failed so dump it */ 4646 *offset = length; 4647 if (locked_tcb) { 4648 SCTP_TCB_UNLOCK(locked_tcb); 4649 } 4650 return (NULL); 4651 } else { 4652 /* remaining chunks are HMAC checked */ 4653 stcb->asoc.authenticated = 1; 4654 } 4655 } 4656 } 4657 if (stcb == NULL) { 4658 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4659 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4660 msg); 4661 /* no association, so it's out of the blue... */ 4662 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4663 mflowtype, mflowid, inp->fibnum, 4664 vrf_id, port); 4665 *offset = length; 4666 if (locked_tcb) { 4667 SCTP_TCB_UNLOCK(locked_tcb); 4668 } 4669 return (NULL); 4670 } 4671 asoc = &stcb->asoc; 4672 /* ABORT and SHUTDOWN can use either v_tag... */ 4673 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4674 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4675 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4676 /* Take the T-bit always into account. */ 4677 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4678 (vtag_in == asoc->my_vtag)) || 4679 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4680 (vtag_in == asoc->peer_vtag))) { 4681 /* this is valid */ 4682 } else { 4683 /* drop this packet... */ 4684 SCTP_STAT_INCR(sctps_badvtag); 4685 if (locked_tcb) { 4686 SCTP_TCB_UNLOCK(locked_tcb); 4687 } 4688 return (NULL); 4689 } 4690 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4691 if (vtag_in != asoc->my_vtag) { 4692 /* 4693 * this could be a stale SHUTDOWN-ACK or the 4694 * peer never got the SHUTDOWN-COMPLETE and 4695 * is still hung; we have started a new asoc 4696 * but it won't complete until the shutdown 4697 * is completed 4698 */ 4699 if (locked_tcb) { 4700 SCTP_TCB_UNLOCK(locked_tcb); 4701 } 4702 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4703 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4704 msg); 4705 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4706 sh, inp, op_err, 4707 mflowtype, mflowid, fibnum, 4708 vrf_id, port); 4709 return (NULL); 4710 } 4711 } else { 4712 /* for all other chunks, vtag must match */ 4713 if (vtag_in != asoc->my_vtag) { 4714 /* invalid vtag... */ 4715 SCTPDBG(SCTP_DEBUG_INPUT3, 4716 "invalid vtag: %xh, expect %xh\n", 4717 vtag_in, asoc->my_vtag); 4718 SCTP_STAT_INCR(sctps_badvtag); 4719 if (locked_tcb) { 4720 SCTP_TCB_UNLOCK(locked_tcb); 4721 } 4722 *offset = length; 4723 return (NULL); 4724 } 4725 } 4726 } /* end if !SCTP_COOKIE_ECHO */ 4727 /* 4728 * process all control chunks... 4729 */ 4730 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4731 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4732 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4733 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4734 /* implied cookie-ack.. we must have lost the ack */ 4735 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4736 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4737 stcb->asoc.overall_error_count, 4738 0, 4739 SCTP_FROM_SCTP_INPUT, 4740 __LINE__); 4741 } 4742 stcb->asoc.overall_error_count = 0; 4743 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4744 *netp); 4745 } 4746 process_control_chunks: 4747 while (IS_SCTP_CONTROL(ch)) { 4748 /* validate chunk length */ 4749 chk_length = ntohs(ch->chunk_length); 4750 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4751 ch->chunk_type, chk_length); 4752 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4753 if (chk_length < sizeof(*ch) || 4754 (*offset + (int)chk_length) > length) { 4755 *offset = length; 4756 if (locked_tcb) { 4757 SCTP_TCB_UNLOCK(locked_tcb); 4758 } 4759 return (NULL); 4760 } 4761 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4762 /* 4763 * INIT-ACK only gets the init ack "header" portion only 4764 * because we don't have to process the peer's COOKIE. All 4765 * others get a complete chunk. 4766 */ 4767 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4768 (ch->chunk_type == SCTP_INITIATION)) { 4769 /* get an init-ack chunk */ 4770 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4771 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4772 if (ch == NULL) { 4773 *offset = length; 4774 if (locked_tcb) { 4775 SCTP_TCB_UNLOCK(locked_tcb); 4776 } 4777 return (NULL); 4778 } 4779 } else { 4780 /* For cookies and all other chunks. */ 4781 if (chk_length > sizeof(chunk_buf)) { 4782 /* 4783 * use just the size of the chunk buffer so 4784 * the front part of our chunks fit in 4785 * contiguous space up to the chunk buffer 4786 * size (508 bytes). For chunks that need to 4787 * get more than that they must use the 4788 * sctp_m_getptr() function or other means 4789 * (e.g. know how to parse mbuf chains). 4790 * Cookies do this already. 4791 */ 4792 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4793 (sizeof(chunk_buf) - 4), 4794 chunk_buf); 4795 if (ch == NULL) { 4796 *offset = length; 4797 if (locked_tcb) { 4798 SCTP_TCB_UNLOCK(locked_tcb); 4799 } 4800 return (NULL); 4801 } 4802 } else { 4803 /* We can fit it all */ 4804 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4805 chk_length, chunk_buf); 4806 if (ch == NULL) { 4807 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4808 *offset = length; 4809 if (locked_tcb) { 4810 SCTP_TCB_UNLOCK(locked_tcb); 4811 } 4812 return (NULL); 4813 } 4814 } 4815 } 4816 num_chunks++; 4817 /* Save off the last place we got a control from */ 4818 if (stcb != NULL) { 4819 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4820 /* 4821 * allow last_control to be NULL if 4822 * ASCONF... ASCONF processing will find the 4823 * right net later 4824 */ 4825 if ((netp != NULL) && (*netp != NULL)) 4826 stcb->asoc.last_control_chunk_from = *netp; 4827 } 4828 } 4829 #ifdef SCTP_AUDITING_ENABLED 4830 sctp_audit_log(0xB0, ch->chunk_type); 4831 #endif 4832 4833 /* check to see if this chunk required auth, but isn't */ 4834 if ((stcb != NULL) && 4835 (stcb->asoc.auth_supported == 1) && 4836 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4837 !stcb->asoc.authenticated) { 4838 /* "silently" ignore */ 4839 SCTP_STAT_INCR(sctps_recvauthmissing); 4840 goto next_chunk; 4841 } 4842 switch (ch->chunk_type) { 4843 case SCTP_INITIATION: 4844 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4845 /* The INIT chunk must be the only chunk. */ 4846 if ((num_chunks > 1) || 4847 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4848 /* RFC 4960 requires that no ABORT is sent */ 4849 *offset = length; 4850 if (locked_tcb) { 4851 SCTP_TCB_UNLOCK(locked_tcb); 4852 } 4853 return (NULL); 4854 } 4855 /* Honor our resource limit. */ 4856 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4857 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4858 sctp_abort_association(inp, stcb, m, iphlen, 4859 src, dst, sh, op_err, 4860 mflowtype, mflowid, 4861 vrf_id, port); 4862 *offset = length; 4863 return (NULL); 4864 } 4865 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4866 (struct sctp_init_chunk *)ch, inp, 4867 stcb, *netp, &abort_no_unlock, 4868 mflowtype, mflowid, 4869 vrf_id, port); 4870 *offset = length; 4871 if ((!abort_no_unlock) && (locked_tcb)) { 4872 SCTP_TCB_UNLOCK(locked_tcb); 4873 } 4874 return (NULL); 4875 break; 4876 case SCTP_PAD_CHUNK: 4877 break; 4878 case SCTP_INITIATION_ACK: 4879 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4880 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4881 /* We are not interested anymore */ 4882 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4883 ; 4884 } else { 4885 if ((locked_tcb != NULL) && (locked_tcb != stcb)) { 4886 /* Very unlikely */ 4887 SCTP_TCB_UNLOCK(locked_tcb); 4888 } 4889 *offset = length; 4890 if (stcb) { 4891 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4892 so = SCTP_INP_SO(inp); 4893 atomic_add_int(&stcb->asoc.refcnt, 1); 4894 SCTP_TCB_UNLOCK(stcb); 4895 SCTP_SOCKET_LOCK(so, 1); 4896 SCTP_TCB_LOCK(stcb); 4897 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4898 #endif 4899 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4900 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4901 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4902 SCTP_SOCKET_UNLOCK(so, 1); 4903 #endif 4904 } 4905 return (NULL); 4906 } 4907 } 4908 /* The INIT-ACK chunk must be the only chunk. */ 4909 if ((num_chunks > 1) || 4910 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4911 *offset = length; 4912 if (locked_tcb) { 4913 SCTP_TCB_UNLOCK(locked_tcb); 4914 } 4915 return (NULL); 4916 } 4917 if ((netp) && (*netp)) { 4918 ret = sctp_handle_init_ack(m, iphlen, *offset, 4919 src, dst, sh, 4920 (struct sctp_init_ack_chunk *)ch, 4921 stcb, *netp, 4922 &abort_no_unlock, 4923 mflowtype, mflowid, 4924 vrf_id); 4925 } else { 4926 ret = -1; 4927 } 4928 *offset = length; 4929 if (abort_no_unlock) { 4930 return (NULL); 4931 } 4932 /* 4933 * Special case, I must call the output routine to 4934 * get the cookie echoed 4935 */ 4936 if ((stcb != NULL) && (ret == 0)) { 4937 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4938 } 4939 if (locked_tcb) { 4940 SCTP_TCB_UNLOCK(locked_tcb); 4941 } 4942 return (NULL); 4943 break; 4944 case SCTP_SELECTIVE_ACK: 4945 { 4946 struct sctp_sack_chunk *sack; 4947 int abort_now = 0; 4948 uint32_t a_rwnd, cum_ack; 4949 uint16_t num_seg, num_dup; 4950 uint8_t flags; 4951 int offset_seg, offset_dup; 4952 4953 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4954 SCTP_STAT_INCR(sctps_recvsacks); 4955 if (stcb == NULL) { 4956 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4957 break; 4958 } 4959 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4960 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4961 break; 4962 } 4963 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4964 /*- 4965 * If we have sent a shutdown-ack, we will pay no 4966 * attention to a sack sent in to us since 4967 * we don't care anymore. 4968 */ 4969 break; 4970 } 4971 sack = (struct sctp_sack_chunk *)ch; 4972 flags = ch->chunk_flags; 4973 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4974 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4975 num_dup = ntohs(sack->sack.num_dup_tsns); 4976 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4977 if (sizeof(struct sctp_sack_chunk) + 4978 num_seg * sizeof(struct sctp_gap_ack_block) + 4979 num_dup * sizeof(uint32_t) != chk_length) { 4980 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4981 break; 4982 } 4983 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4984 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4985 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4986 cum_ack, num_seg, a_rwnd); 4987 stcb->asoc.seen_a_sack_this_pkt = 1; 4988 if ((stcb->asoc.pr_sctp_cnt == 0) && 4989 (num_seg == 0) && 4990 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4991 (stcb->asoc.saw_sack_with_frags == 0) && 4992 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4993 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4994 ) { 4995 /* 4996 * We have a SIMPLE sack having no 4997 * prior segments and data on sent 4998 * queue to be acked.. Use the 4999 * faster path sack processing. We 5000 * also allow window update sacks 5001 * with no missing segments to go 5002 * this way too. 5003 */ 5004 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 5005 } else { 5006 if (netp && *netp) 5007 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5008 num_seg, 0, num_dup, &abort_now, flags, 5009 cum_ack, a_rwnd, ecne_seen); 5010 } 5011 if (abort_now) { 5012 /* ABORT signal from sack processing */ 5013 *offset = length; 5014 return (NULL); 5015 } 5016 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5017 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5018 (stcb->asoc.stream_queue_cnt == 0)) { 5019 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5020 } 5021 } 5022 break; 5023 /* 5024 * EY - nr_sack: If the received chunk is an 5025 * nr_sack chunk 5026 */ 5027 case SCTP_NR_SELECTIVE_ACK: 5028 { 5029 struct sctp_nr_sack_chunk *nr_sack; 5030 int abort_now = 0; 5031 uint32_t a_rwnd, cum_ack; 5032 uint16_t num_seg, num_nr_seg, num_dup; 5033 uint8_t flags; 5034 int offset_seg, offset_dup; 5035 5036 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5037 SCTP_STAT_INCR(sctps_recvsacks); 5038 if (stcb == NULL) { 5039 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5040 break; 5041 } 5042 if (stcb->asoc.nrsack_supported == 0) { 5043 goto unknown_chunk; 5044 } 5045 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5046 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5047 break; 5048 } 5049 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5050 /*- 5051 * If we have sent a shutdown-ack, we will pay no 5052 * attention to a sack sent in to us since 5053 * we don't care anymore. 5054 */ 5055 break; 5056 } 5057 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5058 flags = ch->chunk_flags; 5059 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5060 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5061 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5062 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5063 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5064 if (sizeof(struct sctp_nr_sack_chunk) + 5065 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5066 num_dup * sizeof(uint32_t) != chk_length) { 5067 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5068 break; 5069 } 5070 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5071 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5072 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5073 cum_ack, num_seg, a_rwnd); 5074 stcb->asoc.seen_a_sack_this_pkt = 1; 5075 if ((stcb->asoc.pr_sctp_cnt == 0) && 5076 (num_seg == 0) && (num_nr_seg == 0) && 5077 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5078 (stcb->asoc.saw_sack_with_frags == 0) && 5079 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5080 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5081 /* 5082 * We have a SIMPLE sack having no 5083 * prior segments and data on sent 5084 * queue to be acked. Use the faster 5085 * path sack processing. We also 5086 * allow window update sacks with no 5087 * missing segments to go this way 5088 * too. 5089 */ 5090 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5091 &abort_now, ecne_seen); 5092 } else { 5093 if (netp && *netp) 5094 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5095 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5096 cum_ack, a_rwnd, ecne_seen); 5097 } 5098 if (abort_now) { 5099 /* ABORT signal from sack processing */ 5100 *offset = length; 5101 return (NULL); 5102 } 5103 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5104 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5105 (stcb->asoc.stream_queue_cnt == 0)) { 5106 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5107 } 5108 } 5109 break; 5110 5111 case SCTP_HEARTBEAT_REQUEST: 5112 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5113 if ((stcb) && netp && *netp) { 5114 SCTP_STAT_INCR(sctps_recvheartbeat); 5115 sctp_send_heartbeat_ack(stcb, m, *offset, 5116 chk_length, *netp); 5117 5118 /* He's alive so give him credit */ 5119 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5120 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5121 stcb->asoc.overall_error_count, 5122 0, 5123 SCTP_FROM_SCTP_INPUT, 5124 __LINE__); 5125 } 5126 stcb->asoc.overall_error_count = 0; 5127 } 5128 break; 5129 case SCTP_HEARTBEAT_ACK: 5130 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5131 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5132 /* Its not ours */ 5133 *offset = length; 5134 if (locked_tcb) { 5135 SCTP_TCB_UNLOCK(locked_tcb); 5136 } 5137 return (NULL); 5138 } 5139 /* He's alive so give him credit */ 5140 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5141 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5142 stcb->asoc.overall_error_count, 5143 0, 5144 SCTP_FROM_SCTP_INPUT, 5145 __LINE__); 5146 } 5147 stcb->asoc.overall_error_count = 0; 5148 SCTP_STAT_INCR(sctps_recvheartbeatack); 5149 if (netp && *netp) 5150 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5151 stcb, *netp); 5152 break; 5153 case SCTP_ABORT_ASSOCIATION: 5154 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5155 (void *)stcb); 5156 if ((stcb) && netp && *netp) 5157 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5158 stcb, *netp); 5159 *offset = length; 5160 return (NULL); 5161 break; 5162 case SCTP_SHUTDOWN: 5163 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5164 (void *)stcb); 5165 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5166 *offset = length; 5167 if (locked_tcb) { 5168 SCTP_TCB_UNLOCK(locked_tcb); 5169 } 5170 return (NULL); 5171 } 5172 if (netp && *netp) { 5173 int abort_flag = 0; 5174 5175 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5176 stcb, *netp, &abort_flag); 5177 if (abort_flag) { 5178 *offset = length; 5179 return (NULL); 5180 } 5181 } 5182 break; 5183 case SCTP_SHUTDOWN_ACK: 5184 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5185 if ((stcb) && (netp) && (*netp)) 5186 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5187 *offset = length; 5188 return (NULL); 5189 break; 5190 5191 case SCTP_OPERATION_ERROR: 5192 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5193 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5194 *offset = length; 5195 return (NULL); 5196 } 5197 break; 5198 case SCTP_COOKIE_ECHO: 5199 SCTPDBG(SCTP_DEBUG_INPUT3, 5200 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5201 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5202 ; 5203 } else { 5204 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5205 /* We are not interested anymore */ 5206 abend: 5207 if (stcb) { 5208 SCTP_TCB_UNLOCK(stcb); 5209 } 5210 *offset = length; 5211 return (NULL); 5212 } 5213 } 5214 /* 5215 * First are we accepting? We do this again here 5216 * since it is possible that a previous endpoint WAS 5217 * listening responded to a INIT-ACK and then 5218 * closed. We opened and bound.. and are now no 5219 * longer listening. 5220 */ 5221 5222 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5223 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5224 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5225 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5226 sctp_abort_association(inp, stcb, m, iphlen, 5227 src, dst, sh, op_err, 5228 mflowtype, mflowid, 5229 vrf_id, port); 5230 } 5231 *offset = length; 5232 return (NULL); 5233 } else { 5234 struct mbuf *ret_buf; 5235 struct sctp_inpcb *linp; 5236 5237 if (stcb) { 5238 linp = NULL; 5239 } else { 5240 linp = inp; 5241 } 5242 5243 if (linp) { 5244 SCTP_ASOC_CREATE_LOCK(linp); 5245 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5246 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5247 SCTP_ASOC_CREATE_UNLOCK(linp); 5248 goto abend; 5249 } 5250 } 5251 if (netp) { 5252 ret_buf = 5253 sctp_handle_cookie_echo(m, iphlen, 5254 *offset, 5255 src, dst, 5256 sh, 5257 (struct sctp_cookie_echo_chunk *)ch, 5258 &inp, &stcb, netp, 5259 auth_skipped, 5260 auth_offset, 5261 auth_len, 5262 &locked_tcb, 5263 mflowtype, 5264 mflowid, 5265 vrf_id, 5266 port); 5267 } else { 5268 ret_buf = NULL; 5269 } 5270 if (linp) { 5271 SCTP_ASOC_CREATE_UNLOCK(linp); 5272 } 5273 if (ret_buf == NULL) { 5274 if (locked_tcb) { 5275 SCTP_TCB_UNLOCK(locked_tcb); 5276 } 5277 SCTPDBG(SCTP_DEBUG_INPUT3, 5278 "GAK, null buffer\n"); 5279 *offset = length; 5280 return (NULL); 5281 } 5282 /* if AUTH skipped, see if it verified... */ 5283 if (auth_skipped) { 5284 got_auth = 1; 5285 auth_skipped = 0; 5286 } 5287 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5288 /* 5289 * Restart the timer if we have 5290 * pending data 5291 */ 5292 struct sctp_tmit_chunk *chk; 5293 5294 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5295 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5296 } 5297 } 5298 break; 5299 case SCTP_COOKIE_ACK: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5301 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5302 if (locked_tcb) { 5303 SCTP_TCB_UNLOCK(locked_tcb); 5304 } 5305 return (NULL); 5306 } 5307 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5308 /* We are not interested anymore */ 5309 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5310 ; 5311 } else if (stcb) { 5312 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5313 so = SCTP_INP_SO(inp); 5314 atomic_add_int(&stcb->asoc.refcnt, 1); 5315 SCTP_TCB_UNLOCK(stcb); 5316 SCTP_SOCKET_LOCK(so, 1); 5317 SCTP_TCB_LOCK(stcb); 5318 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5319 #endif 5320 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5321 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5322 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5323 SCTP_SOCKET_UNLOCK(so, 1); 5324 #endif 5325 *offset = length; 5326 return (NULL); 5327 } 5328 } 5329 /* He's alive so give him credit */ 5330 if ((stcb) && netp && *netp) { 5331 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5332 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5333 stcb->asoc.overall_error_count, 5334 0, 5335 SCTP_FROM_SCTP_INPUT, 5336 __LINE__); 5337 } 5338 stcb->asoc.overall_error_count = 0; 5339 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5340 } 5341 break; 5342 case SCTP_ECN_ECHO: 5343 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5344 /* He's alive so give him credit */ 5345 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5346 /* Its not ours */ 5347 if (locked_tcb) { 5348 SCTP_TCB_UNLOCK(locked_tcb); 5349 } 5350 *offset = length; 5351 return (NULL); 5352 } 5353 if (stcb) { 5354 if (stcb->asoc.ecn_supported == 0) { 5355 goto unknown_chunk; 5356 } 5357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5358 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5359 stcb->asoc.overall_error_count, 5360 0, 5361 SCTP_FROM_SCTP_INPUT, 5362 __LINE__); 5363 } 5364 stcb->asoc.overall_error_count = 0; 5365 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5366 stcb); 5367 ecne_seen = 1; 5368 } 5369 break; 5370 case SCTP_ECN_CWR: 5371 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5372 /* He's alive so give him credit */ 5373 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5374 /* Its not ours */ 5375 if (locked_tcb) { 5376 SCTP_TCB_UNLOCK(locked_tcb); 5377 } 5378 *offset = length; 5379 return (NULL); 5380 } 5381 if (stcb) { 5382 if (stcb->asoc.ecn_supported == 0) { 5383 goto unknown_chunk; 5384 } 5385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5386 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5387 stcb->asoc.overall_error_count, 5388 0, 5389 SCTP_FROM_SCTP_INPUT, 5390 __LINE__); 5391 } 5392 stcb->asoc.overall_error_count = 0; 5393 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5394 } 5395 break; 5396 case SCTP_SHUTDOWN_COMPLETE: 5397 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5398 /* must be first and only chunk */ 5399 if ((num_chunks > 1) || 5400 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5401 *offset = length; 5402 if (locked_tcb) { 5403 SCTP_TCB_UNLOCK(locked_tcb); 5404 } 5405 return (NULL); 5406 } 5407 if ((stcb) && netp && *netp) { 5408 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5409 stcb, *netp); 5410 } 5411 *offset = length; 5412 return (NULL); 5413 break; 5414 case SCTP_ASCONF: 5415 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5416 /* He's alive so give him credit */ 5417 if (stcb) { 5418 if (stcb->asoc.asconf_supported == 0) { 5419 goto unknown_chunk; 5420 } 5421 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5422 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5423 stcb->asoc.overall_error_count, 5424 0, 5425 SCTP_FROM_SCTP_INPUT, 5426 __LINE__); 5427 } 5428 stcb->asoc.overall_error_count = 0; 5429 sctp_handle_asconf(m, *offset, src, 5430 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5431 asconf_cnt++; 5432 } 5433 break; 5434 case SCTP_ASCONF_ACK: 5435 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5436 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5437 /* Its not ours */ 5438 if (locked_tcb) { 5439 SCTP_TCB_UNLOCK(locked_tcb); 5440 } 5441 *offset = length; 5442 return (NULL); 5443 } 5444 if ((stcb) && netp && *netp) { 5445 if (stcb->asoc.asconf_supported == 0) { 5446 goto unknown_chunk; 5447 } 5448 /* He's alive so give him credit */ 5449 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5450 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5451 stcb->asoc.overall_error_count, 5452 0, 5453 SCTP_FROM_SCTP_INPUT, 5454 __LINE__); 5455 } 5456 stcb->asoc.overall_error_count = 0; 5457 sctp_handle_asconf_ack(m, *offset, 5458 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5459 if (abort_no_unlock) 5460 return (NULL); 5461 } 5462 break; 5463 case SCTP_FORWARD_CUM_TSN: 5464 case SCTP_IFORWARD_CUM_TSN: 5465 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5466 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5467 /* Its not ours */ 5468 if (locked_tcb) { 5469 SCTP_TCB_UNLOCK(locked_tcb); 5470 } 5471 *offset = length; 5472 return (NULL); 5473 } 5474 /* He's alive so give him credit */ 5475 if (stcb) { 5476 int abort_flag = 0; 5477 5478 if (stcb->asoc.prsctp_supported == 0) { 5479 goto unknown_chunk; 5480 } 5481 stcb->asoc.overall_error_count = 0; 5482 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5483 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5484 stcb->asoc.overall_error_count, 5485 0, 5486 SCTP_FROM_SCTP_INPUT, 5487 __LINE__); 5488 } 5489 *fwd_tsn_seen = 1; 5490 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5491 /* We are not interested anymore */ 5492 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5493 so = SCTP_INP_SO(inp); 5494 atomic_add_int(&stcb->asoc.refcnt, 1); 5495 SCTP_TCB_UNLOCK(stcb); 5496 SCTP_SOCKET_LOCK(so, 1); 5497 SCTP_TCB_LOCK(stcb); 5498 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5499 #endif 5500 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5501 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5502 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5503 SCTP_SOCKET_UNLOCK(so, 1); 5504 #endif 5505 *offset = length; 5506 return (NULL); 5507 } 5508 sctp_handle_forward_tsn(stcb, 5509 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5510 if (abort_flag) { 5511 *offset = length; 5512 return (NULL); 5513 } else { 5514 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5515 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5516 stcb->asoc.overall_error_count, 5517 0, 5518 SCTP_FROM_SCTP_INPUT, 5519 __LINE__); 5520 } 5521 stcb->asoc.overall_error_count = 0; 5522 } 5523 5524 } 5525 break; 5526 case SCTP_STREAM_RESET: 5527 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5528 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5529 /* Its not ours */ 5530 if (locked_tcb) { 5531 SCTP_TCB_UNLOCK(locked_tcb); 5532 } 5533 *offset = length; 5534 return (NULL); 5535 } 5536 if (stcb->asoc.reconfig_supported == 0) { 5537 goto unknown_chunk; 5538 } 5539 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5540 /* stop processing */ 5541 *offset = length; 5542 return (NULL); 5543 } 5544 break; 5545 case SCTP_PACKET_DROPPED: 5546 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5547 /* re-get it all please */ 5548 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5549 /* Its not ours */ 5550 if (locked_tcb) { 5551 SCTP_TCB_UNLOCK(locked_tcb); 5552 } 5553 *offset = length; 5554 return (NULL); 5555 } 5556 if (ch && (stcb) && netp && (*netp)) { 5557 if (stcb->asoc.pktdrop_supported == 0) { 5558 goto unknown_chunk; 5559 } 5560 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5561 stcb, *netp, 5562 min(chk_length, (sizeof(chunk_buf) - 4))); 5563 5564 } 5565 break; 5566 case SCTP_AUTHENTICATION: 5567 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5568 if (stcb == NULL) { 5569 /* save the first AUTH for later processing */ 5570 if (auth_skipped == 0) { 5571 auth_offset = *offset; 5572 auth_len = chk_length; 5573 auth_skipped = 1; 5574 } 5575 /* skip this chunk (temporarily) */ 5576 goto next_chunk; 5577 } 5578 if (stcb->asoc.auth_supported == 0) { 5579 goto unknown_chunk; 5580 } 5581 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5582 (chk_length > (sizeof(struct sctp_auth_chunk) + 5583 SCTP_AUTH_DIGEST_LEN_MAX))) { 5584 /* Its not ours */ 5585 if (locked_tcb) { 5586 SCTP_TCB_UNLOCK(locked_tcb); 5587 } 5588 *offset = length; 5589 return (NULL); 5590 } 5591 if (got_auth == 1) { 5592 /* skip this chunk... it's already auth'd */ 5593 goto next_chunk; 5594 } 5595 got_auth = 1; 5596 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5597 m, *offset)) { 5598 /* auth HMAC failed so dump the packet */ 5599 *offset = length; 5600 return (stcb); 5601 } else { 5602 /* remaining chunks are HMAC checked */ 5603 stcb->asoc.authenticated = 1; 5604 } 5605 break; 5606 5607 default: 5608 unknown_chunk: 5609 /* it's an unknown chunk! */ 5610 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5611 struct sctp_gen_error_cause *cause; 5612 int len; 5613 5614 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5615 0, M_NOWAIT, 1, MT_DATA); 5616 if (op_err != NULL) { 5617 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5618 cause = mtod(op_err, struct sctp_gen_error_cause *); 5619 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5620 cause->length = htons((uint16_t) (len + sizeof(struct sctp_gen_error_cause))); 5621 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5622 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5623 if (SCTP_BUF_NEXT(op_err) != NULL) { 5624 #ifdef SCTP_MBUF_LOGGING 5625 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5626 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5627 } 5628 #endif 5629 sctp_queue_op_err(stcb, op_err); 5630 } else { 5631 sctp_m_freem(op_err); 5632 } 5633 } 5634 } 5635 if ((ch->chunk_type & 0x80) == 0) { 5636 /* discard this packet */ 5637 *offset = length; 5638 return (stcb); 5639 } /* else skip this bad chunk and continue... */ 5640 break; 5641 } /* switch (ch->chunk_type) */ 5642 5643 5644 next_chunk: 5645 /* get the next chunk */ 5646 *offset += SCTP_SIZE32(chk_length); 5647 if (*offset >= length) { 5648 /* no more data left in the mbuf chain */ 5649 break; 5650 } 5651 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5652 sizeof(struct sctp_chunkhdr), chunk_buf); 5653 if (ch == NULL) { 5654 if (locked_tcb) { 5655 SCTP_TCB_UNLOCK(locked_tcb); 5656 } 5657 *offset = length; 5658 return (NULL); 5659 } 5660 } /* while */ 5661 5662 if (asconf_cnt > 0 && stcb != NULL) { 5663 sctp_send_asconf_ack(stcb); 5664 } 5665 return (stcb); 5666 } 5667 5668 5669 /* 5670 * common input chunk processing (v4 and v6) 5671 */ 5672 void 5673 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5674 struct sockaddr *src, struct sockaddr *dst, 5675 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5676 #if !defined(SCTP_WITH_NO_CSUM) 5677 uint8_t compute_crc, 5678 #endif 5679 uint8_t ecn_bits, 5680 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5681 uint32_t vrf_id, uint16_t port) 5682 { 5683 uint32_t high_tsn; 5684 int fwd_tsn_seen = 0, data_processed = 0; 5685 struct mbuf *m = *mm, *op_err; 5686 char msg[SCTP_DIAG_INFO_LEN]; 5687 int un_sent; 5688 int cnt_ctrl_ready = 0; 5689 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5690 struct sctp_tcb *stcb = NULL; 5691 struct sctp_nets *net = NULL; 5692 5693 SCTP_STAT_INCR(sctps_recvdatagrams); 5694 #ifdef SCTP_AUDITING_ENABLED 5695 sctp_audit_log(0xE0, 1); 5696 sctp_auditing(0, inp, stcb, net); 5697 #endif 5698 #if !defined(SCTP_WITH_NO_CSUM) 5699 if (compute_crc != 0) { 5700 uint32_t check, calc_check; 5701 5702 check = sh->checksum; 5703 sh->checksum = 0; 5704 calc_check = sctp_calculate_cksum(m, iphlen); 5705 sh->checksum = check; 5706 if (calc_check != check) { 5707 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5708 calc_check, check, (void *)m, length, iphlen); 5709 stcb = sctp_findassociation_addr(m, offset, src, dst, 5710 sh, ch, &inp, &net, vrf_id); 5711 #if defined(INET) || defined(INET6) 5712 if ((ch->chunk_type != SCTP_INITIATION) && 5713 (net != NULL) && (net->port != port)) { 5714 if (net->port == 0) { 5715 /* UDP encapsulation turned on. */ 5716 net->mtu -= sizeof(struct udphdr); 5717 if (stcb->asoc.smallest_mtu > net->mtu) { 5718 sctp_pathmtu_adjustment(stcb, net->mtu); 5719 } 5720 } else if (port == 0) { 5721 /* UDP encapsulation turned off. */ 5722 net->mtu += sizeof(struct udphdr); 5723 /* XXX Update smallest_mtu */ 5724 } 5725 net->port = port; 5726 } 5727 #endif 5728 if (net != NULL) { 5729 net->flowtype = mflowtype; 5730 net->flowid = mflowid; 5731 } 5732 if ((inp != NULL) && (stcb != NULL)) { 5733 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5734 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5735 } else if ((inp != NULL) && (stcb == NULL)) { 5736 inp_decr = inp; 5737 } 5738 SCTP_STAT_INCR(sctps_badsum); 5739 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5740 goto out; 5741 } 5742 } 5743 #endif 5744 /* Destination port of 0 is illegal, based on RFC4960. */ 5745 if (sh->dest_port == 0) { 5746 SCTP_STAT_INCR(sctps_hdrops); 5747 goto out; 5748 } 5749 stcb = sctp_findassociation_addr(m, offset, src, dst, 5750 sh, ch, &inp, &net, vrf_id); 5751 #if defined(INET) || defined(INET6) 5752 if ((ch->chunk_type != SCTP_INITIATION) && 5753 (net != NULL) && (net->port != port)) { 5754 if (net->port == 0) { 5755 /* UDP encapsulation turned on. */ 5756 net->mtu -= sizeof(struct udphdr); 5757 if (stcb->asoc.smallest_mtu > net->mtu) { 5758 sctp_pathmtu_adjustment(stcb, net->mtu); 5759 } 5760 } else if (port == 0) { 5761 /* UDP encapsulation turned off. */ 5762 net->mtu += sizeof(struct udphdr); 5763 /* XXX Update smallest_mtu */ 5764 } 5765 net->port = port; 5766 } 5767 #endif 5768 if (net != NULL) { 5769 net->flowtype = mflowtype; 5770 net->flowid = mflowid; 5771 } 5772 if (inp == NULL) { 5773 SCTP_STAT_INCR(sctps_noport); 5774 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5775 goto out; 5776 } 5777 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5778 sctp_send_shutdown_complete2(src, dst, sh, 5779 mflowtype, mflowid, fibnum, 5780 vrf_id, port); 5781 goto out; 5782 } 5783 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5784 goto out; 5785 } 5786 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5787 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5788 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5789 (ch->chunk_type != SCTP_INIT))) { 5790 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5791 "Out of the blue"); 5792 sctp_send_abort(m, iphlen, src, dst, 5793 sh, 0, op_err, 5794 mflowtype, mflowid, fibnum, 5795 vrf_id, port); 5796 } 5797 } 5798 goto out; 5799 } else if (stcb == NULL) { 5800 inp_decr = inp; 5801 } 5802 #ifdef IPSEC 5803 /*- 5804 * I very much doubt any of the IPSEC stuff will work but I have no 5805 * idea, so I will leave it in place. 5806 */ 5807 if (inp != NULL) { 5808 switch (dst->sa_family) { 5809 #ifdef INET 5810 case AF_INET: 5811 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5812 SCTP_STAT_INCR(sctps_hdrops); 5813 goto out; 5814 } 5815 break; 5816 #endif 5817 #ifdef INET6 5818 case AF_INET6: 5819 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5820 SCTP_STAT_INCR(sctps_hdrops); 5821 goto out; 5822 } 5823 break; 5824 #endif 5825 default: 5826 break; 5827 } 5828 } 5829 #endif 5830 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5831 (void *)m, iphlen, offset, length, (void *)stcb); 5832 if (stcb) { 5833 /* always clear this before beginning a packet */ 5834 stcb->asoc.authenticated = 0; 5835 stcb->asoc.seen_a_sack_this_pkt = 0; 5836 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5837 (void *)stcb, stcb->asoc.state); 5838 5839 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5840 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5841 /*- 5842 * If we hit here, we had a ref count 5843 * up when the assoc was aborted and the 5844 * timer is clearing out the assoc, we should 5845 * NOT respond to any packet.. its OOTB. 5846 */ 5847 SCTP_TCB_UNLOCK(stcb); 5848 stcb = NULL; 5849 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5850 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5851 msg); 5852 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5853 mflowtype, mflowid, inp->fibnum, 5854 vrf_id, port); 5855 goto out; 5856 } 5857 } 5858 if (IS_SCTP_CONTROL(ch)) { 5859 /* process the control portion of the SCTP packet */ 5860 /* sa_ignore NO_NULL_CHK */ 5861 stcb = sctp_process_control(m, iphlen, &offset, length, 5862 src, dst, sh, ch, 5863 inp, stcb, &net, &fwd_tsn_seen, 5864 mflowtype, mflowid, fibnum, 5865 vrf_id, port); 5866 if (stcb) { 5867 /* 5868 * This covers us if the cookie-echo was there and 5869 * it changes our INP. 5870 */ 5871 inp = stcb->sctp_ep; 5872 #if defined(INET) || defined(INET6) 5873 if ((ch->chunk_type != SCTP_INITIATION) && 5874 (net != NULL) && (net->port != port)) { 5875 if (net->port == 0) { 5876 /* UDP encapsulation turned on. */ 5877 net->mtu -= sizeof(struct udphdr); 5878 if (stcb->asoc.smallest_mtu > net->mtu) { 5879 sctp_pathmtu_adjustment(stcb, net->mtu); 5880 } 5881 } else if (port == 0) { 5882 /* UDP encapsulation turned off. */ 5883 net->mtu += sizeof(struct udphdr); 5884 /* XXX Update smallest_mtu */ 5885 } 5886 net->port = port; 5887 } 5888 #endif 5889 } 5890 } else { 5891 /* 5892 * no control chunks, so pre-process DATA chunks (these 5893 * checks are taken care of by control processing) 5894 */ 5895 5896 /* 5897 * if DATA only packet, and auth is required, then punt... 5898 * can't have authenticated without any AUTH (control) 5899 * chunks 5900 */ 5901 if ((stcb != NULL) && 5902 (stcb->asoc.auth_supported == 1) && 5903 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5904 /* "silently" ignore */ 5905 SCTP_STAT_INCR(sctps_recvauthmissing); 5906 goto out; 5907 } 5908 if (stcb == NULL) { 5909 /* out of the blue DATA chunk */ 5910 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5911 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5912 msg); 5913 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5914 mflowtype, mflowid, fibnum, 5915 vrf_id, port); 5916 goto out; 5917 } 5918 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5919 /* v_tag mismatch! */ 5920 SCTP_STAT_INCR(sctps_badvtag); 5921 goto out; 5922 } 5923 } 5924 5925 if (stcb == NULL) { 5926 /* 5927 * no valid TCB for this packet, or we found it's a bad 5928 * packet while processing control, or we're done with this 5929 * packet (done or skip rest of data), so we drop it... 5930 */ 5931 goto out; 5932 } 5933 /* 5934 * DATA chunk processing 5935 */ 5936 /* plow through the data chunks while length > offset */ 5937 5938 /* 5939 * Rest should be DATA only. Check authentication state if AUTH for 5940 * DATA is required. 5941 */ 5942 if ((length > offset) && 5943 (stcb != NULL) && 5944 (stcb->asoc.auth_supported == 1) && 5945 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5946 !stcb->asoc.authenticated) { 5947 /* "silently" ignore */ 5948 SCTP_STAT_INCR(sctps_recvauthmissing); 5949 SCTPDBG(SCTP_DEBUG_AUTH1, 5950 "Data chunk requires AUTH, skipped\n"); 5951 goto trigger_send; 5952 } 5953 if (length > offset) { 5954 int retval; 5955 5956 /* 5957 * First check to make sure our state is correct. We would 5958 * not get here unless we really did have a tag, so we don't 5959 * abort if this happens, just dump the chunk silently. 5960 */ 5961 switch (SCTP_GET_STATE(&stcb->asoc)) { 5962 case SCTP_STATE_COOKIE_ECHOED: 5963 /* 5964 * we consider data with valid tags in this state 5965 * shows us the cookie-ack was lost. Imply it was 5966 * there. 5967 */ 5968 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5969 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5970 stcb->asoc.overall_error_count, 5971 0, 5972 SCTP_FROM_SCTP_INPUT, 5973 __LINE__); 5974 } 5975 stcb->asoc.overall_error_count = 0; 5976 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5977 break; 5978 case SCTP_STATE_COOKIE_WAIT: 5979 /* 5980 * We consider OOTB any data sent during asoc setup. 5981 */ 5982 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5983 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5984 msg); 5985 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5986 mflowtype, mflowid, inp->fibnum, 5987 vrf_id, port); 5988 goto out; 5989 /* sa_ignore NOTREACHED */ 5990 break; 5991 case SCTP_STATE_EMPTY: /* should not happen */ 5992 case SCTP_STATE_INUSE: /* should not happen */ 5993 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5994 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5995 default: 5996 goto out; 5997 /* sa_ignore NOTREACHED */ 5998 break; 5999 case SCTP_STATE_OPEN: 6000 case SCTP_STATE_SHUTDOWN_SENT: 6001 break; 6002 } 6003 /* plow through the data chunks while length > offset */ 6004 retval = sctp_process_data(mm, iphlen, &offset, length, 6005 inp, stcb, net, &high_tsn); 6006 if (retval == 2) { 6007 /* 6008 * The association aborted, NO UNLOCK needed since 6009 * the association is destroyed. 6010 */ 6011 stcb = NULL; 6012 goto out; 6013 } 6014 data_processed = 1; 6015 /* 6016 * Anything important needs to have been m_copy'ed in 6017 * process_data 6018 */ 6019 } 6020 /* take care of ecn */ 6021 if ((data_processed == 1) && 6022 (stcb->asoc.ecn_supported == 1) && 6023 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6024 /* Yep, we need to add a ECNE */ 6025 sctp_send_ecn_echo(stcb, net, high_tsn); 6026 } 6027 if ((data_processed == 0) && (fwd_tsn_seen)) { 6028 int was_a_gap; 6029 uint32_t highest_tsn; 6030 6031 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6032 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6033 } else { 6034 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6035 } 6036 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6037 stcb->asoc.send_sack = 1; 6038 sctp_sack_check(stcb, was_a_gap); 6039 } else if (fwd_tsn_seen) { 6040 stcb->asoc.send_sack = 1; 6041 } 6042 /* trigger send of any chunks in queue... */ 6043 trigger_send: 6044 #ifdef SCTP_AUDITING_ENABLED 6045 sctp_audit_log(0xE0, 2); 6046 sctp_auditing(1, inp, stcb, net); 6047 #endif 6048 SCTPDBG(SCTP_DEBUG_INPUT1, 6049 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6050 stcb->asoc.peers_rwnd, 6051 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6052 stcb->asoc.total_flight); 6053 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6054 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6055 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6056 } 6057 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 6058 cnt_ctrl_ready || 6059 stcb->asoc.trigger_reset || 6060 ((un_sent) && 6061 (stcb->asoc.peers_rwnd > 0 || 6062 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6063 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6064 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6065 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6066 } 6067 #ifdef SCTP_AUDITING_ENABLED 6068 sctp_audit_log(0xE0, 3); 6069 sctp_auditing(2, inp, stcb, net); 6070 #endif 6071 out: 6072 if (stcb != NULL) { 6073 SCTP_TCB_UNLOCK(stcb); 6074 } 6075 if (inp_decr != NULL) { 6076 /* reduce ref-count */ 6077 SCTP_INP_WLOCK(inp_decr); 6078 SCTP_INP_DECR_REF(inp_decr); 6079 SCTP_INP_WUNLOCK(inp_decr); 6080 } 6081 return; 6082 } 6083 6084 #ifdef INET 6085 void 6086 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6087 { 6088 struct mbuf *m; 6089 int iphlen; 6090 uint32_t vrf_id = 0; 6091 uint8_t ecn_bits; 6092 struct sockaddr_in src, dst; 6093 struct ip *ip; 6094 struct sctphdr *sh; 6095 struct sctp_chunkhdr *ch; 6096 int length, offset; 6097 6098 #if !defined(SCTP_WITH_NO_CSUM) 6099 uint8_t compute_crc; 6100 6101 #endif 6102 uint32_t mflowid; 6103 uint8_t mflowtype; 6104 uint16_t fibnum; 6105 6106 iphlen = off; 6107 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6108 SCTP_RELEASE_PKT(i_pak); 6109 return; 6110 } 6111 m = SCTP_HEADER_TO_CHAIN(i_pak); 6112 #ifdef SCTP_MBUF_LOGGING 6113 /* Log in any input mbufs */ 6114 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6115 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6116 } 6117 #endif 6118 #ifdef SCTP_PACKET_LOGGING 6119 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6120 sctp_packet_log(m); 6121 } 6122 #endif 6123 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6124 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6125 m->m_pkthdr.len, 6126 if_name(m->m_pkthdr.rcvif), 6127 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6128 mflowid = m->m_pkthdr.flowid; 6129 mflowtype = M_HASHTYPE_GET(m); 6130 fibnum = M_GETFIB(m); 6131 SCTP_STAT_INCR(sctps_recvpackets); 6132 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6133 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6134 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6135 if (SCTP_BUF_LEN(m) < offset) { 6136 if ((m = m_pullup(m, offset)) == NULL) { 6137 SCTP_STAT_INCR(sctps_hdrops); 6138 return; 6139 } 6140 } 6141 ip = mtod(m, struct ip *); 6142 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6143 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6144 offset -= sizeof(struct sctp_chunkhdr); 6145 memset(&src, 0, sizeof(struct sockaddr_in)); 6146 src.sin_family = AF_INET; 6147 src.sin_len = sizeof(struct sockaddr_in); 6148 src.sin_port = sh->src_port; 6149 src.sin_addr = ip->ip_src; 6150 memset(&dst, 0, sizeof(struct sockaddr_in)); 6151 dst.sin_family = AF_INET; 6152 dst.sin_len = sizeof(struct sockaddr_in); 6153 dst.sin_port = sh->dest_port; 6154 dst.sin_addr = ip->ip_dst; 6155 length = ntohs(ip->ip_len); 6156 /* Validate mbuf chain length with IP payload length. */ 6157 if (SCTP_HEADER_LEN(m) != length) { 6158 SCTPDBG(SCTP_DEBUG_INPUT1, 6159 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6160 SCTP_STAT_INCR(sctps_hdrops); 6161 goto out; 6162 } 6163 /* SCTP does not allow broadcasts or multicasts */ 6164 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6165 goto out; 6166 } 6167 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6168 goto out; 6169 } 6170 ecn_bits = ip->ip_tos; 6171 #if defined(SCTP_WITH_NO_CSUM) 6172 SCTP_STAT_INCR(sctps_recvnocrc); 6173 #else 6174 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6175 SCTP_STAT_INCR(sctps_recvhwcrc); 6176 compute_crc = 0; 6177 } else { 6178 SCTP_STAT_INCR(sctps_recvswcrc); 6179 compute_crc = 1; 6180 } 6181 #endif 6182 sctp_common_input_processing(&m, iphlen, offset, length, 6183 (struct sockaddr *)&src, 6184 (struct sockaddr *)&dst, 6185 sh, ch, 6186 #if !defined(SCTP_WITH_NO_CSUM) 6187 compute_crc, 6188 #endif 6189 ecn_bits, 6190 mflowtype, mflowid, fibnum, 6191 vrf_id, port); 6192 out: 6193 if (m) { 6194 sctp_m_freem(m); 6195 } 6196 return; 6197 } 6198 6199 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6200 extern int *sctp_cpuarry; 6201 6202 #endif 6203 6204 int 6205 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6206 { 6207 struct mbuf *m; 6208 int off; 6209 6210 m = *mp; 6211 off = *offp; 6212 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6213 if (mp_ncpus > 1) { 6214 struct ip *ip; 6215 struct sctphdr *sh; 6216 int offset; 6217 int cpu_to_use; 6218 uint32_t flowid, tag; 6219 6220 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6221 flowid = m->m_pkthdr.flowid; 6222 } else { 6223 /* 6224 * No flow id built by lower layers fix it so we 6225 * create one. 6226 */ 6227 offset = off + sizeof(struct sctphdr); 6228 if (SCTP_BUF_LEN(m) < offset) { 6229 if ((m = m_pullup(m, offset)) == NULL) { 6230 SCTP_STAT_INCR(sctps_hdrops); 6231 return (IPPROTO_DONE); 6232 } 6233 } 6234 ip = mtod(m, struct ip *); 6235 sh = (struct sctphdr *)((caddr_t)ip + off); 6236 tag = htonl(sh->v_tag); 6237 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6238 m->m_pkthdr.flowid = flowid; 6239 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6240 } 6241 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6242 sctp_queue_to_mcore(m, off, cpu_to_use); 6243 return (IPPROTO_DONE); 6244 } 6245 #endif 6246 sctp_input_with_port(m, off, 0); 6247 return (IPPROTO_DONE); 6248 } 6249 6250 #endif 6251