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_mid_ordered = 0; 1973 stcb->asoc.strmout[i].next_mid_unordered = 0; 1974 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1975 } 1976 /* process the INIT-ACK info (my info) */ 1977 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1978 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1979 1980 /* pull from vtag hash */ 1981 LIST_REMOVE(stcb, sctp_asocs); 1982 /* re-insert to new vtag position */ 1983 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1984 SCTP_BASE_INFO(hashasocmark))]; 1985 /* 1986 * put it in the bucket in the vtag hash of assoc's for the 1987 * system 1988 */ 1989 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1990 1991 SCTP_TCB_SEND_UNLOCK(stcb); 1992 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1993 SCTP_INP_INFO_WUNLOCK(); 1994 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1995 SCTP_SOCKET_UNLOCK(so, 1); 1996 #endif 1997 asoc->total_flight = 0; 1998 asoc->total_flight_count = 0; 1999 /* process the INIT info (peer's info) */ 2000 retval = sctp_process_init(init_cp, stcb); 2001 if (retval < 0) { 2002 if (how_indx < sizeof(asoc->cookie_how)) 2003 asoc->cookie_how[how_indx] = 13; 2004 2005 return (NULL); 2006 } 2007 /* 2008 * since we did not send a HB make sure we don't double 2009 * things 2010 */ 2011 net->hb_responded = 1; 2012 2013 if (sctp_load_addresses_from_init(stcb, m, 2014 init_offset + sizeof(struct sctp_init_chunk), 2015 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2016 if (how_indx < sizeof(asoc->cookie_how)) 2017 asoc->cookie_how[how_indx] = 14; 2018 2019 return (NULL); 2020 } 2021 /* respond with a COOKIE-ACK */ 2022 sctp_stop_all_cookie_timers(stcb); 2023 sctp_toss_old_cookies(stcb, asoc); 2024 sctp_send_cookie_ack(stcb); 2025 if (how_indx < sizeof(asoc->cookie_how)) 2026 asoc->cookie_how[how_indx] = 15; 2027 2028 return (stcb); 2029 } 2030 if (how_indx < sizeof(asoc->cookie_how)) 2031 asoc->cookie_how[how_indx] = 16; 2032 /* all other cases... */ 2033 return (NULL); 2034 } 2035 2036 2037 /* 2038 * handle a state cookie for a new association m: input packet mbuf chain-- 2039 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2040 * and the cookie signature does not exist offset: offset into mbuf to the 2041 * cookie-echo chunk length: length of the cookie chunk to: where the init 2042 * was from returns a new TCB 2043 */ 2044 static struct sctp_tcb * 2045 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2046 struct sockaddr *src, struct sockaddr *dst, 2047 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2048 struct sctp_inpcb *inp, struct sctp_nets **netp, 2049 struct sockaddr *init_src, int *notification, 2050 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2051 uint8_t mflowtype, uint32_t mflowid, 2052 uint32_t vrf_id, uint16_t port) 2053 { 2054 struct sctp_tcb *stcb; 2055 struct sctp_init_chunk *init_cp, init_buf; 2056 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2057 union sctp_sockstore store; 2058 struct sctp_association *asoc; 2059 int init_offset, initack_offset, initack_limit; 2060 int retval; 2061 int error = 0; 2062 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2063 2064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2065 struct socket *so; 2066 2067 so = SCTP_INP_SO(inp); 2068 #endif 2069 2070 /* 2071 * find and validate the INIT chunk in the cookie (peer's info) the 2072 * INIT should start after the cookie-echo header struct (chunk 2073 * header, state cookie header struct) 2074 */ 2075 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2076 init_cp = (struct sctp_init_chunk *) 2077 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2078 (uint8_t *) & init_buf); 2079 if (init_cp == NULL) { 2080 /* could not pull a INIT chunk in cookie */ 2081 SCTPDBG(SCTP_DEBUG_INPUT1, 2082 "process_cookie_new: could not pull INIT chunk hdr\n"); 2083 return (NULL); 2084 } 2085 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2086 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2087 return (NULL); 2088 } 2089 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2090 /* 2091 * find and validate the INIT-ACK chunk in the cookie (my info) the 2092 * INIT-ACK follows the INIT chunk 2093 */ 2094 initack_cp = (struct sctp_init_ack_chunk *) 2095 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2096 (uint8_t *) & initack_buf); 2097 if (initack_cp == NULL) { 2098 /* could not pull INIT-ACK chunk in cookie */ 2099 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2100 return (NULL); 2101 } 2102 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2103 return (NULL); 2104 } 2105 /* 2106 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2107 * "initack_limit" value. This is because the chk_length field 2108 * includes the length of the cookie, but the cookie is omitted when 2109 * the INIT and INIT_ACK are tacked onto the cookie... 2110 */ 2111 initack_limit = offset + cookie_len; 2112 2113 /* 2114 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2115 * and popluate 2116 */ 2117 2118 /* 2119 * Here we do a trick, we set in NULL for the proc/thread argument. 2120 * We do this since in effect we only use the p argument when the 2121 * socket is unbound and we must do an implicit bind. Since we are 2122 * getting a cookie, we cannot be unbound. 2123 */ 2124 stcb = sctp_aloc_assoc(inp, init_src, &error, 2125 ntohl(initack_cp->init.initiate_tag), vrf_id, 2126 ntohs(initack_cp->init.num_outbound_streams), 2127 port, 2128 (struct thread *)NULL 2129 ); 2130 if (stcb == NULL) { 2131 struct mbuf *op_err; 2132 2133 /* memory problem? */ 2134 SCTPDBG(SCTP_DEBUG_INPUT1, 2135 "process_cookie_new: no room for another TCB!\n"); 2136 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2137 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2138 src, dst, sh, op_err, 2139 mflowtype, mflowid, 2140 vrf_id, port); 2141 return (NULL); 2142 } 2143 /* get the correct sctp_nets */ 2144 if (netp) 2145 *netp = sctp_findnet(stcb, init_src); 2146 2147 asoc = &stcb->asoc; 2148 /* get scope variables out of cookie */ 2149 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2150 asoc->scope.site_scope = cookie->site_scope; 2151 asoc->scope.local_scope = cookie->local_scope; 2152 asoc->scope.loopback_scope = cookie->loopback_scope; 2153 2154 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2155 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2156 struct mbuf *op_err; 2157 2158 /* 2159 * Houston we have a problem. The EP changed while the 2160 * cookie was in flight. Only recourse is to abort the 2161 * association. 2162 */ 2163 atomic_add_int(&stcb->asoc.refcnt, 1); 2164 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2165 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2166 src, dst, sh, op_err, 2167 mflowtype, mflowid, 2168 vrf_id, port); 2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_TCB_UNLOCK(stcb); 2171 SCTP_SOCKET_LOCK(so, 1); 2172 SCTP_TCB_LOCK(stcb); 2173 #endif 2174 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2175 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2176 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2177 SCTP_SOCKET_UNLOCK(so, 1); 2178 #endif 2179 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2180 return (NULL); 2181 } 2182 /* process the INIT-ACK info (my info) */ 2183 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2184 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2185 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2186 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2187 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2188 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2189 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2190 asoc->str_reset_seq_in = asoc->init_seq_number; 2191 2192 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2193 2194 /* process the INIT info (peer's info) */ 2195 if (netp) 2196 retval = sctp_process_init(init_cp, stcb); 2197 else 2198 retval = 0; 2199 if (retval < 0) { 2200 atomic_add_int(&stcb->asoc.refcnt, 1); 2201 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_TCB_UNLOCK(stcb); 2203 SCTP_SOCKET_LOCK(so, 1); 2204 SCTP_TCB_LOCK(stcb); 2205 #endif 2206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2207 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2208 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2209 SCTP_SOCKET_UNLOCK(so, 1); 2210 #endif 2211 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2212 return (NULL); 2213 } 2214 /* load all addresses */ 2215 if (sctp_load_addresses_from_init(stcb, m, 2216 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2217 src, dst, init_src, port)) { 2218 atomic_add_int(&stcb->asoc.refcnt, 1); 2219 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2220 SCTP_TCB_UNLOCK(stcb); 2221 SCTP_SOCKET_LOCK(so, 1); 2222 SCTP_TCB_LOCK(stcb); 2223 #endif 2224 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2225 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2226 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2227 SCTP_SOCKET_UNLOCK(so, 1); 2228 #endif 2229 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2230 return (NULL); 2231 } 2232 /* 2233 * verify any preceding AUTH chunk that was skipped 2234 */ 2235 /* pull the local authentication parameters from the cookie/init-ack */ 2236 sctp_auth_get_cookie_params(stcb, m, 2237 initack_offset + sizeof(struct sctp_init_ack_chunk), 2238 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2239 if (auth_skipped) { 2240 struct sctp_auth_chunk *auth; 2241 2242 auth = (struct sctp_auth_chunk *) 2243 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2244 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2245 /* auth HMAC failed, dump the assoc and packet */ 2246 SCTPDBG(SCTP_DEBUG_AUTH1, 2247 "COOKIE-ECHO: AUTH failed\n"); 2248 atomic_add_int(&stcb->asoc.refcnt, 1); 2249 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2250 SCTP_TCB_UNLOCK(stcb); 2251 SCTP_SOCKET_LOCK(so, 1); 2252 SCTP_TCB_LOCK(stcb); 2253 #endif 2254 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2255 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2256 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2257 SCTP_SOCKET_UNLOCK(so, 1); 2258 #endif 2259 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2260 return (NULL); 2261 } else { 2262 /* remaining chunks checked... good to go */ 2263 stcb->asoc.authenticated = 1; 2264 } 2265 } 2266 /* update current state */ 2267 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2268 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2269 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2270 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2271 stcb->sctp_ep, stcb, asoc->primary_destination); 2272 } 2273 sctp_stop_all_cookie_timers(stcb); 2274 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2275 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2276 2277 /* 2278 * if we're doing ASCONFs, check to see if we have any new local 2279 * addresses that need to get added to the peer (eg. addresses 2280 * changed while cookie echo in flight). This needs to be done 2281 * after we go to the OPEN state to do the correct asconf 2282 * processing. else, make sure we have the correct addresses in our 2283 * lists 2284 */ 2285 2286 /* warning, we re-use sin, sin6, sa_store here! */ 2287 /* pull in local_address (our "from" address) */ 2288 switch (cookie->laddr_type) { 2289 #ifdef INET 2290 case SCTP_IPV4_ADDRESS: 2291 /* source addr is IPv4 */ 2292 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2293 store.sin.sin_family = AF_INET; 2294 store.sin.sin_len = sizeof(struct sockaddr_in); 2295 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2296 break; 2297 #endif 2298 #ifdef INET6 2299 case SCTP_IPV6_ADDRESS: 2300 /* source addr is IPv6 */ 2301 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2302 store.sin6.sin6_family = AF_INET6; 2303 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2304 store.sin6.sin6_scope_id = cookie->scope_id; 2305 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2306 break; 2307 #endif 2308 default: 2309 atomic_add_int(&stcb->asoc.refcnt, 1); 2310 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2311 SCTP_TCB_UNLOCK(stcb); 2312 SCTP_SOCKET_LOCK(so, 1); 2313 SCTP_TCB_LOCK(stcb); 2314 #endif 2315 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2316 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2317 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2318 SCTP_SOCKET_UNLOCK(so, 1); 2319 #endif 2320 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2321 return (NULL); 2322 } 2323 2324 /* set up to notify upper layer */ 2325 *notification = SCTP_NOTIFY_ASSOC_UP; 2326 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2327 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2328 (inp->sctp_socket->so_qlimit == 0)) { 2329 /* 2330 * This is an endpoint that called connect() how it got a 2331 * cookie that is NEW is a bit of a mystery. It must be that 2332 * the INIT was sent, but before it got there.. a complete 2333 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2334 * should have went to the other code.. not here.. oh well.. 2335 * a bit of protection is worth having.. 2336 */ 2337 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2339 atomic_add_int(&stcb->asoc.refcnt, 1); 2340 SCTP_TCB_UNLOCK(stcb); 2341 SCTP_SOCKET_LOCK(so, 1); 2342 SCTP_TCB_LOCK(stcb); 2343 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2344 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2345 SCTP_SOCKET_UNLOCK(so, 1); 2346 return (NULL); 2347 } 2348 #endif 2349 soisconnected(stcb->sctp_socket); 2350 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2351 SCTP_SOCKET_UNLOCK(so, 1); 2352 #endif 2353 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2354 (inp->sctp_socket->so_qlimit)) { 2355 /* 2356 * We don't want to do anything with this one. Since it is 2357 * the listening guy. The timer will get started for 2358 * accepted connections in the caller. 2359 */ 2360 ; 2361 } 2362 /* since we did not send a HB make sure we don't double things */ 2363 if ((netp) && (*netp)) 2364 (*netp)->hb_responded = 1; 2365 2366 if (stcb->asoc.sctp_autoclose_ticks && 2367 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2368 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2369 } 2370 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2371 if ((netp != NULL) && (*netp != NULL)) { 2372 /* calculate the RTT and set the encaps port */ 2373 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2374 &cookie->time_entered, sctp_align_unsafe_makecopy, 2375 SCTP_RTT_FROM_NON_DATA); 2376 } 2377 /* respond with a COOKIE-ACK */ 2378 sctp_send_cookie_ack(stcb); 2379 2380 /* 2381 * check the address lists for any ASCONFs that need to be sent 2382 * AFTER the cookie-ack is sent 2383 */ 2384 sctp_check_address_list(stcb, m, 2385 initack_offset + sizeof(struct sctp_init_ack_chunk), 2386 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2387 &store.sa, cookie->local_scope, cookie->site_scope, 2388 cookie->ipv4_scope, cookie->loopback_scope); 2389 2390 2391 return (stcb); 2392 } 2393 2394 /* 2395 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2396 * we NEED to make sure we are not already using the vtag. If so we 2397 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2398 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2399 SCTP_BASE_INFO(hashasocmark))]; 2400 LIST_FOREACH(stcb, head, sctp_asocs) { 2401 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2402 -- SEND ABORT - TRY AGAIN -- 2403 } 2404 } 2405 */ 2406 2407 /* 2408 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2409 * existing (non-NULL) TCB 2410 */ 2411 static struct mbuf * 2412 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2413 struct sockaddr *src, struct sockaddr *dst, 2414 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2415 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2416 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2417 struct sctp_tcb **locked_tcb, 2418 uint8_t mflowtype, uint32_t mflowid, 2419 uint32_t vrf_id, uint16_t port) 2420 { 2421 struct sctp_state_cookie *cookie; 2422 struct sctp_tcb *l_stcb = *stcb; 2423 struct sctp_inpcb *l_inp; 2424 struct sockaddr *to; 2425 struct sctp_pcb *ep; 2426 struct mbuf *m_sig; 2427 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2428 uint8_t *sig; 2429 uint8_t cookie_ok = 0; 2430 unsigned int sig_offset, cookie_offset; 2431 unsigned int cookie_len; 2432 struct timeval now; 2433 struct timeval time_expires; 2434 int notification = 0; 2435 struct sctp_nets *netl; 2436 int had_a_existing_tcb = 0; 2437 int send_int_conf = 0; 2438 2439 #ifdef INET 2440 struct sockaddr_in sin; 2441 2442 #endif 2443 #ifdef INET6 2444 struct sockaddr_in6 sin6; 2445 2446 #endif 2447 2448 SCTPDBG(SCTP_DEBUG_INPUT2, 2449 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2450 2451 if (inp_p == NULL) { 2452 return (NULL); 2453 } 2454 cookie = &cp->cookie; 2455 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2456 cookie_len = ntohs(cp->ch.chunk_length); 2457 2458 if ((cookie->peerport != sh->src_port) || 2459 (cookie->myport != sh->dest_port) || 2460 (cookie->my_vtag != sh->v_tag)) { 2461 /* 2462 * invalid ports or bad tag. Note that we always leave the 2463 * v_tag in the header in network order and when we stored 2464 * it in the my_vtag slot we also left it in network order. 2465 * This maintains the match even though it may be in the 2466 * opposite byte order of the machine :-> 2467 */ 2468 return (NULL); 2469 } 2470 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2471 sizeof(struct sctp_init_chunk) + 2472 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2473 /* cookie too small */ 2474 return (NULL); 2475 } 2476 /* 2477 * split off the signature into its own mbuf (since it should not be 2478 * calculated in the sctp_hmac_m() call). 2479 */ 2480 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2481 m_sig = m_split(m, sig_offset, M_NOWAIT); 2482 if (m_sig == NULL) { 2483 /* out of memory or ?? */ 2484 return (NULL); 2485 } 2486 #ifdef SCTP_MBUF_LOGGING 2487 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2488 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2489 } 2490 #endif 2491 2492 /* 2493 * compute the signature/digest for the cookie 2494 */ 2495 ep = &(*inp_p)->sctp_ep; 2496 l_inp = *inp_p; 2497 if (l_stcb) { 2498 SCTP_TCB_UNLOCK(l_stcb); 2499 } 2500 SCTP_INP_RLOCK(l_inp); 2501 if (l_stcb) { 2502 SCTP_TCB_LOCK(l_stcb); 2503 } 2504 /* which cookie is it? */ 2505 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2506 (ep->current_secret_number != ep->last_secret_number)) { 2507 /* it's the old cookie */ 2508 (void)sctp_hmac_m(SCTP_HMAC, 2509 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2510 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2511 } else { 2512 /* it's the current cookie */ 2513 (void)sctp_hmac_m(SCTP_HMAC, 2514 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2515 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2516 } 2517 /* get the signature */ 2518 SCTP_INP_RUNLOCK(l_inp); 2519 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2520 if (sig == NULL) { 2521 /* couldn't find signature */ 2522 sctp_m_freem(m_sig); 2523 return (NULL); 2524 } 2525 /* compare the received digest with the computed digest */ 2526 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2527 /* try the old cookie? */ 2528 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2529 (ep->current_secret_number != ep->last_secret_number)) { 2530 /* compute digest with old */ 2531 (void)sctp_hmac_m(SCTP_HMAC, 2532 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2533 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2534 /* compare */ 2535 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2536 cookie_ok = 1; 2537 } 2538 } else { 2539 cookie_ok = 1; 2540 } 2541 2542 /* 2543 * Now before we continue we must reconstruct our mbuf so that 2544 * normal processing of any other chunks will work. 2545 */ 2546 { 2547 struct mbuf *m_at; 2548 2549 m_at = m; 2550 while (SCTP_BUF_NEXT(m_at) != NULL) { 2551 m_at = SCTP_BUF_NEXT(m_at); 2552 } 2553 SCTP_BUF_NEXT(m_at) = m_sig; 2554 } 2555 2556 if (cookie_ok == 0) { 2557 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2558 SCTPDBG(SCTP_DEBUG_INPUT2, 2559 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2560 (uint32_t) offset, cookie_offset, sig_offset); 2561 return (NULL); 2562 } 2563 /* 2564 * check the cookie timestamps to be sure it's not stale 2565 */ 2566 (void)SCTP_GETTIME_TIMEVAL(&now); 2567 /* Expire time is in Ticks, so we convert to seconds */ 2568 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2569 time_expires.tv_usec = cookie->time_entered.tv_usec; 2570 /* 2571 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2572 * is undefined. 2573 */ 2574 if (timevalcmp(&now, &time_expires, >)) { 2575 /* cookie is stale! */ 2576 struct mbuf *op_err; 2577 struct sctp_error_stale_cookie *cause; 2578 uint32_t tim; 2579 2580 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2581 0, M_NOWAIT, 1, MT_DATA); 2582 if (op_err == NULL) { 2583 /* FOOBAR */ 2584 return (NULL); 2585 } 2586 /* Set the len */ 2587 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2588 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2589 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2590 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2591 (sizeof(uint32_t)))); 2592 /* seconds to usec */ 2593 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2594 /* add in usec */ 2595 if (tim == 0) 2596 tim = now.tv_usec - cookie->time_entered.tv_usec; 2597 cause->stale_time = htonl(tim); 2598 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2599 mflowtype, mflowid, l_inp->fibnum, 2600 vrf_id, port); 2601 return (NULL); 2602 } 2603 /* 2604 * Now we must see with the lookup address if we have an existing 2605 * asoc. This will only happen if we were in the COOKIE-WAIT state 2606 * and a INIT collided with us and somewhere the peer sent the 2607 * cookie on another address besides the single address our assoc 2608 * had for him. In this case we will have one of the tie-tags set at 2609 * least AND the address field in the cookie can be used to look it 2610 * up. 2611 */ 2612 to = NULL; 2613 switch (cookie->addr_type) { 2614 #ifdef INET6 2615 case SCTP_IPV6_ADDRESS: 2616 memset(&sin6, 0, sizeof(sin6)); 2617 sin6.sin6_family = AF_INET6; 2618 sin6.sin6_len = sizeof(sin6); 2619 sin6.sin6_port = sh->src_port; 2620 sin6.sin6_scope_id = cookie->scope_id; 2621 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2622 sizeof(sin6.sin6_addr.s6_addr)); 2623 to = (struct sockaddr *)&sin6; 2624 break; 2625 #endif 2626 #ifdef INET 2627 case SCTP_IPV4_ADDRESS: 2628 memset(&sin, 0, sizeof(sin)); 2629 sin.sin_family = AF_INET; 2630 sin.sin_len = sizeof(sin); 2631 sin.sin_port = sh->src_port; 2632 sin.sin_addr.s_addr = cookie->address[0]; 2633 to = (struct sockaddr *)&sin; 2634 break; 2635 #endif 2636 default: 2637 /* This should not happen */ 2638 return (NULL); 2639 } 2640 if (*stcb == NULL) { 2641 /* Yep, lets check */ 2642 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2643 if (*stcb == NULL) { 2644 /* 2645 * We should have only got back the same inp. If we 2646 * got back a different ep we have a problem. The 2647 * original findep got back l_inp and now 2648 */ 2649 if (l_inp != *inp_p) { 2650 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2651 } 2652 } else { 2653 if (*locked_tcb == NULL) { 2654 /* 2655 * In this case we found the assoc only 2656 * after we locked the create lock. This 2657 * means we are in a colliding case and we 2658 * must make sure that we unlock the tcb if 2659 * its one of the cases where we throw away 2660 * the incoming packets. 2661 */ 2662 *locked_tcb = *stcb; 2663 2664 /* 2665 * We must also increment the inp ref count 2666 * since the ref_count flags was set when we 2667 * did not find the TCB, now we found it 2668 * which reduces the refcount.. we must 2669 * raise it back out to balance it all :-) 2670 */ 2671 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2672 if ((*stcb)->sctp_ep != l_inp) { 2673 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2674 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2675 } 2676 } 2677 } 2678 } 2679 cookie_len -= SCTP_SIGNATURE_SIZE; 2680 if (*stcb == NULL) { 2681 /* this is the "normal" case... get a new TCB */ 2682 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2683 cookie, cookie_len, *inp_p, 2684 netp, to, ¬ification, 2685 auth_skipped, auth_offset, auth_len, 2686 mflowtype, mflowid, 2687 vrf_id, port); 2688 } else { 2689 /* this is abnormal... cookie-echo on existing TCB */ 2690 had_a_existing_tcb = 1; 2691 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2692 src, dst, sh, 2693 cookie, cookie_len, *inp_p, *stcb, netp, to, 2694 ¬ification, auth_skipped, auth_offset, auth_len, 2695 mflowtype, mflowid, 2696 vrf_id, port); 2697 } 2698 2699 if (*stcb == NULL) { 2700 /* still no TCB... must be bad cookie-echo */ 2701 return (NULL); 2702 } 2703 if (*netp != NULL) { 2704 (*netp)->flowtype = mflowtype; 2705 (*netp)->flowid = mflowid; 2706 } 2707 /* 2708 * Ok, we built an association so confirm the address we sent the 2709 * INIT-ACK to. 2710 */ 2711 netl = sctp_findnet(*stcb, to); 2712 /* 2713 * This code should in theory NOT run but 2714 */ 2715 if (netl == NULL) { 2716 /* TSNH! Huh, why do I need to add this address here? */ 2717 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2718 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2719 return (NULL); 2720 } 2721 netl = sctp_findnet(*stcb, to); 2722 } 2723 if (netl) { 2724 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2725 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2726 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2727 netl); 2728 send_int_conf = 1; 2729 } 2730 } 2731 sctp_start_net_timers(*stcb); 2732 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2733 if (!had_a_existing_tcb || 2734 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2735 /* 2736 * If we have a NEW cookie or the connect never 2737 * reached the connected state during collision we 2738 * must do the TCP accept thing. 2739 */ 2740 struct socket *so, *oso; 2741 struct sctp_inpcb *inp; 2742 2743 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2744 /* 2745 * For a restart we will keep the same 2746 * socket, no need to do anything. I THINK!! 2747 */ 2748 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2749 if (send_int_conf) { 2750 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2751 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2752 } 2753 return (m); 2754 } 2755 oso = (*inp_p)->sctp_socket; 2756 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2757 SCTP_TCB_UNLOCK((*stcb)); 2758 CURVNET_SET(oso->so_vnet); 2759 so = sonewconn(oso, 0 2760 ); 2761 CURVNET_RESTORE(); 2762 SCTP_TCB_LOCK((*stcb)); 2763 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2764 2765 if (so == NULL) { 2766 struct mbuf *op_err; 2767 2768 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2769 struct socket *pcb_so; 2770 2771 #endif 2772 /* Too many sockets */ 2773 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2774 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2775 sctp_abort_association(*inp_p, NULL, m, iphlen, 2776 src, dst, sh, op_err, 2777 mflowtype, mflowid, 2778 vrf_id, port); 2779 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2780 pcb_so = SCTP_INP_SO(*inp_p); 2781 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2782 SCTP_TCB_UNLOCK((*stcb)); 2783 SCTP_SOCKET_LOCK(pcb_so, 1); 2784 SCTP_TCB_LOCK((*stcb)); 2785 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2786 #endif 2787 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2788 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2789 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2790 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2791 #endif 2792 return (NULL); 2793 } 2794 inp = (struct sctp_inpcb *)so->so_pcb; 2795 SCTP_INP_INCR_REF(inp); 2796 /* 2797 * We add the unbound flag here so that if we get an 2798 * soabort() before we get the move_pcb done, we 2799 * will properly cleanup. 2800 */ 2801 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2802 SCTP_PCB_FLAGS_CONNECTED | 2803 SCTP_PCB_FLAGS_IN_TCPPOOL | 2804 SCTP_PCB_FLAGS_UNBOUND | 2805 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2806 SCTP_PCB_FLAGS_DONT_WAKE); 2807 inp->sctp_features = (*inp_p)->sctp_features; 2808 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2809 inp->sctp_socket = so; 2810 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2811 inp->max_cwnd = (*inp_p)->max_cwnd; 2812 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2813 inp->ecn_supported = (*inp_p)->ecn_supported; 2814 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2815 inp->auth_supported = (*inp_p)->auth_supported; 2816 inp->asconf_supported = (*inp_p)->asconf_supported; 2817 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2818 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2819 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2820 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2821 inp->sctp_context = (*inp_p)->sctp_context; 2822 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2823 inp->fibnum = (*inp_p)->fibnum; 2824 inp->inp_starting_point_for_iterator = NULL; 2825 /* 2826 * copy in the authentication parameters from the 2827 * original endpoint 2828 */ 2829 if (inp->sctp_ep.local_hmacs) 2830 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2831 inp->sctp_ep.local_hmacs = 2832 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2833 if (inp->sctp_ep.local_auth_chunks) 2834 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2835 inp->sctp_ep.local_auth_chunks = 2836 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2837 2838 /* 2839 * Now we must move it from one hash table to 2840 * another and get the tcb in the right place. 2841 */ 2842 2843 /* 2844 * This is where the one-2-one socket is put into 2845 * the accept state waiting for the accept! 2846 */ 2847 if (*stcb) { 2848 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2849 } 2850 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2851 2852 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2853 SCTP_TCB_UNLOCK((*stcb)); 2854 2855 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2856 0); 2857 SCTP_TCB_LOCK((*stcb)); 2858 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2859 2860 2861 /* 2862 * now we must check to see if we were aborted while 2863 * the move was going on and the lock/unlock 2864 * happened. 2865 */ 2866 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2867 /* 2868 * yep it was, we leave the assoc attached 2869 * to the socket since the sctp_inpcb_free() 2870 * call will send an abort for us. 2871 */ 2872 SCTP_INP_DECR_REF(inp); 2873 return (NULL); 2874 } 2875 SCTP_INP_DECR_REF(inp); 2876 /* Switch over to the new guy */ 2877 *inp_p = inp; 2878 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2879 if (send_int_conf) { 2880 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2881 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2882 } 2883 /* 2884 * Pull it from the incomplete queue and wake the 2885 * guy 2886 */ 2887 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2888 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2889 SCTP_TCB_UNLOCK((*stcb)); 2890 SCTP_SOCKET_LOCK(so, 1); 2891 #endif 2892 soisconnected(so); 2893 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2894 SCTP_TCB_LOCK((*stcb)); 2895 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2896 SCTP_SOCKET_UNLOCK(so, 1); 2897 #endif 2898 return (m); 2899 } 2900 } 2901 if (notification) { 2902 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2903 } 2904 if (send_int_conf) { 2905 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2906 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2907 } 2908 return (m); 2909 } 2910 2911 static void 2912 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2913 struct sctp_tcb *stcb, struct sctp_nets *net) 2914 { 2915 /* cp must not be used, others call this without a c-ack :-) */ 2916 struct sctp_association *asoc; 2917 2918 SCTPDBG(SCTP_DEBUG_INPUT2, 2919 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2920 if ((stcb == NULL) || (net == NULL)) { 2921 return; 2922 } 2923 asoc = &stcb->asoc; 2924 2925 sctp_stop_all_cookie_timers(stcb); 2926 /* process according to association state */ 2927 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2928 /* state change only needed when I am in right state */ 2929 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2930 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2931 sctp_start_net_timers(stcb); 2932 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2933 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2934 stcb->sctp_ep, stcb, asoc->primary_destination); 2935 2936 } 2937 /* update RTO */ 2938 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2939 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2940 if (asoc->overall_error_count == 0) { 2941 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2942 &asoc->time_entered, sctp_align_safe_nocopy, 2943 SCTP_RTT_FROM_NON_DATA); 2944 } 2945 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2946 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2947 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2948 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2950 struct socket *so; 2951 2952 #endif 2953 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2954 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2955 so = SCTP_INP_SO(stcb->sctp_ep); 2956 atomic_add_int(&stcb->asoc.refcnt, 1); 2957 SCTP_TCB_UNLOCK(stcb); 2958 SCTP_SOCKET_LOCK(so, 1); 2959 SCTP_TCB_LOCK(stcb); 2960 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2961 #endif 2962 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2963 soisconnected(stcb->sctp_socket); 2964 } 2965 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2966 SCTP_SOCKET_UNLOCK(so, 1); 2967 #endif 2968 } 2969 /* 2970 * since we did not send a HB make sure we don't double 2971 * things 2972 */ 2973 net->hb_responded = 1; 2974 2975 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2976 /* 2977 * We don't need to do the asconf thing, nor hb or 2978 * autoclose if the socket is closed. 2979 */ 2980 goto closed_socket; 2981 } 2982 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2983 stcb, net); 2984 2985 2986 if (stcb->asoc.sctp_autoclose_ticks && 2987 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2988 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2989 stcb->sctp_ep, stcb, NULL); 2990 } 2991 /* 2992 * send ASCONF if parameters are pending and ASCONFs are 2993 * allowed (eg. addresses changed when init/cookie echo were 2994 * in flight) 2995 */ 2996 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2997 (stcb->asoc.asconf_supported == 1) && 2998 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2999 #ifdef SCTP_TIMER_BASED_ASCONF 3000 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3001 stcb->sctp_ep, stcb, 3002 stcb->asoc.primary_destination); 3003 #else 3004 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3005 SCTP_ADDR_NOT_LOCKED); 3006 #endif 3007 } 3008 } 3009 closed_socket: 3010 /* Toss the cookie if I can */ 3011 sctp_toss_old_cookies(stcb, asoc); 3012 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3013 /* Restart the timer if we have pending data */ 3014 struct sctp_tmit_chunk *chk; 3015 3016 chk = TAILQ_FIRST(&asoc->sent_queue); 3017 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3018 } 3019 } 3020 3021 static void 3022 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3023 struct sctp_tcb *stcb) 3024 { 3025 struct sctp_nets *net; 3026 struct sctp_tmit_chunk *lchk; 3027 struct sctp_ecne_chunk bkup; 3028 uint8_t override_bit; 3029 uint32_t tsn, window_data_tsn; 3030 int len; 3031 unsigned int pkt_cnt; 3032 3033 len = ntohs(cp->ch.chunk_length); 3034 if ((len != sizeof(struct sctp_ecne_chunk)) && 3035 (len != sizeof(struct old_sctp_ecne_chunk))) { 3036 return; 3037 } 3038 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3039 /* Its the old format */ 3040 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3041 bkup.num_pkts_since_cwr = htonl(1); 3042 cp = &bkup; 3043 } 3044 SCTP_STAT_INCR(sctps_recvecne); 3045 tsn = ntohl(cp->tsn); 3046 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3047 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3048 if (lchk == NULL) { 3049 window_data_tsn = stcb->asoc.sending_seq - 1; 3050 } else { 3051 window_data_tsn = lchk->rec.data.TSN_seq; 3052 } 3053 3054 /* Find where it was sent to if possible. */ 3055 net = NULL; 3056 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3057 if (lchk->rec.data.TSN_seq == tsn) { 3058 net = lchk->whoTo; 3059 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3060 break; 3061 } 3062 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3063 break; 3064 } 3065 } 3066 if (net == NULL) { 3067 /* 3068 * What to do. A previous send of a CWR was possibly lost. 3069 * See how old it is, we may have it marked on the actual 3070 * net. 3071 */ 3072 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3073 if (tsn == net->last_cwr_tsn) { 3074 /* Found him, send it off */ 3075 break; 3076 } 3077 } 3078 if (net == NULL) { 3079 /* 3080 * If we reach here, we need to send a special CWR 3081 * that says hey, we did this a long time ago and 3082 * you lost the response. 3083 */ 3084 net = TAILQ_FIRST(&stcb->asoc.nets); 3085 if (net == NULL) { 3086 /* TSNH */ 3087 return; 3088 } 3089 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3090 } else { 3091 override_bit = 0; 3092 } 3093 } else { 3094 override_bit = 0; 3095 } 3096 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3097 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3098 /* 3099 * JRS - Use the congestion control given in the pluggable 3100 * CC module 3101 */ 3102 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3103 /* 3104 * We reduce once every RTT. So we will only lower cwnd at 3105 * the next sending seq i.e. the window_data_tsn 3106 */ 3107 net->cwr_window_tsn = window_data_tsn; 3108 net->ecn_ce_pkt_cnt += pkt_cnt; 3109 net->lost_cnt = pkt_cnt; 3110 net->last_cwr_tsn = tsn; 3111 } else { 3112 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3113 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3114 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3115 /* 3116 * Another loss in the same window update how many 3117 * marks/packets lost we have had. 3118 */ 3119 int cnt = 1; 3120 3121 if (pkt_cnt > net->lost_cnt) { 3122 /* Should be the case */ 3123 cnt = (pkt_cnt - net->lost_cnt); 3124 net->ecn_ce_pkt_cnt += cnt; 3125 } 3126 net->lost_cnt = pkt_cnt; 3127 net->last_cwr_tsn = tsn; 3128 /* 3129 * Most CC functions will ignore this call, since we 3130 * are in-window yet of the initial CE the peer saw. 3131 */ 3132 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3133 } 3134 } 3135 /* 3136 * We always send a CWR this way if our previous one was lost our 3137 * peer will get an update, or if it is not time again to reduce we 3138 * still get the cwr to the peer. Note we set the override when we 3139 * could not find the TSN on the chunk or the destination network. 3140 */ 3141 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3142 } 3143 3144 static void 3145 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3146 { 3147 /* 3148 * Here we get a CWR from the peer. We must look in the outqueue and 3149 * make sure that we have a covered ECNE in the control chunk part. 3150 * If so remove it. 3151 */ 3152 struct sctp_tmit_chunk *chk; 3153 struct sctp_ecne_chunk *ecne; 3154 int override; 3155 uint32_t cwr_tsn; 3156 3157 cwr_tsn = ntohl(cp->tsn); 3158 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3159 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3160 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3161 continue; 3162 } 3163 if ((override == 0) && (chk->whoTo != net)) { 3164 /* Must be from the right src unless override is set */ 3165 continue; 3166 } 3167 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3168 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3169 /* this covers this ECNE, we can remove it */ 3170 stcb->asoc.ecn_echo_cnt_onq--; 3171 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3172 sctp_next); 3173 sctp_m_freem(chk->data); 3174 chk->data = NULL; 3175 stcb->asoc.ctrl_queue_cnt--; 3176 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3177 if (override == 0) { 3178 break; 3179 } 3180 } 3181 } 3182 } 3183 3184 static void 3185 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3186 struct sctp_tcb *stcb, struct sctp_nets *net) 3187 { 3188 struct sctp_association *asoc; 3189 3190 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3191 struct socket *so; 3192 3193 #endif 3194 3195 SCTPDBG(SCTP_DEBUG_INPUT2, 3196 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3197 if (stcb == NULL) 3198 return; 3199 3200 asoc = &stcb->asoc; 3201 /* process according to association state */ 3202 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3203 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3204 SCTPDBG(SCTP_DEBUG_INPUT2, 3205 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3206 SCTP_TCB_UNLOCK(stcb); 3207 return; 3208 } 3209 /* notify upper layer protocol */ 3210 if (stcb->sctp_socket) { 3211 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3212 } 3213 #ifdef INVARIANTS 3214 if (!TAILQ_EMPTY(&asoc->send_queue) || 3215 !TAILQ_EMPTY(&asoc->sent_queue) || 3216 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3217 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3218 } 3219 #endif 3220 /* stop the timer */ 3221 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3222 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3223 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3224 /* free the TCB */ 3225 SCTPDBG(SCTP_DEBUG_INPUT2, 3226 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3228 so = SCTP_INP_SO(stcb->sctp_ep); 3229 atomic_add_int(&stcb->asoc.refcnt, 1); 3230 SCTP_TCB_UNLOCK(stcb); 3231 SCTP_SOCKET_LOCK(so, 1); 3232 SCTP_TCB_LOCK(stcb); 3233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3234 #endif 3235 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3236 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3238 SCTP_SOCKET_UNLOCK(so, 1); 3239 #endif 3240 return; 3241 } 3242 3243 static int 3244 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3245 struct sctp_nets *net, uint8_t flg) 3246 { 3247 switch (desc->chunk_type) { 3248 case SCTP_DATA: 3249 /* find the tsn to resend (possibly */ 3250 { 3251 uint32_t tsn; 3252 struct sctp_tmit_chunk *tp1; 3253 3254 tsn = ntohl(desc->tsn_ifany); 3255 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3256 if (tp1->rec.data.TSN_seq == tsn) { 3257 /* found it */ 3258 break; 3259 } 3260 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3261 /* not found */ 3262 tp1 = NULL; 3263 break; 3264 } 3265 } 3266 if (tp1 == NULL) { 3267 /* 3268 * Do it the other way , aka without paying 3269 * attention to queue seq order. 3270 */ 3271 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3272 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3273 if (tp1->rec.data.TSN_seq == tsn) { 3274 /* found it */ 3275 break; 3276 } 3277 } 3278 } 3279 if (tp1 == NULL) { 3280 SCTP_STAT_INCR(sctps_pdrptsnnf); 3281 } 3282 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3283 uint8_t *ddp; 3284 3285 if (((flg & SCTP_BADCRC) == 0) && 3286 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3287 return (0); 3288 } 3289 if ((stcb->asoc.peers_rwnd == 0) && 3290 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3291 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3292 return (0); 3293 } 3294 if (stcb->asoc.peers_rwnd == 0 && 3295 (flg & SCTP_FROM_MIDDLE_BOX)) { 3296 SCTP_STAT_INCR(sctps_pdrpdizrw); 3297 return (0); 3298 } 3299 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3300 sizeof(struct sctp_data_chunk)); 3301 { 3302 unsigned int iii; 3303 3304 for (iii = 0; iii < sizeof(desc->data_bytes); 3305 iii++) { 3306 if (ddp[iii] != desc->data_bytes[iii]) { 3307 SCTP_STAT_INCR(sctps_pdrpbadd); 3308 return (-1); 3309 } 3310 } 3311 } 3312 3313 if (tp1->do_rtt) { 3314 /* 3315 * this guy had a RTO calculation 3316 * pending on it, cancel it 3317 */ 3318 if (tp1->whoTo->rto_needed == 0) { 3319 tp1->whoTo->rto_needed = 1; 3320 } 3321 tp1->do_rtt = 0; 3322 } 3323 SCTP_STAT_INCR(sctps_pdrpmark); 3324 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3325 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3326 /* 3327 * mark it as if we were doing a FR, since 3328 * we will be getting gap ack reports behind 3329 * the info from the router. 3330 */ 3331 tp1->rec.data.doing_fast_retransmit = 1; 3332 /* 3333 * mark the tsn with what sequences can 3334 * cause a new FR. 3335 */ 3336 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3337 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3338 } else { 3339 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3340 } 3341 3342 /* restart the timer */ 3343 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3344 stcb, tp1->whoTo, 3345 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3346 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3347 stcb, tp1->whoTo); 3348 3349 /* fix counts and things */ 3350 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3351 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3352 tp1->whoTo->flight_size, 3353 tp1->book_size, 3354 (uint32_t) (uintptr_t) stcb, 3355 tp1->rec.data.TSN_seq); 3356 } 3357 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3358 sctp_flight_size_decrease(tp1); 3359 sctp_total_flight_decrease(stcb, tp1); 3360 } 3361 tp1->sent = SCTP_DATAGRAM_RESEND; 3362 } { 3363 /* audit code */ 3364 unsigned int audit; 3365 3366 audit = 0; 3367 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3368 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3369 audit++; 3370 } 3371 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3372 sctp_next) { 3373 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3374 audit++; 3375 } 3376 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3377 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3378 audit, stcb->asoc.sent_queue_retran_cnt); 3379 #ifndef SCTP_AUDITING_ENABLED 3380 stcb->asoc.sent_queue_retran_cnt = audit; 3381 #endif 3382 } 3383 } 3384 } 3385 break; 3386 case SCTP_ASCONF: 3387 { 3388 struct sctp_tmit_chunk *asconf; 3389 3390 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3391 sctp_next) { 3392 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3393 break; 3394 } 3395 } 3396 if (asconf) { 3397 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3398 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3399 asconf->sent = SCTP_DATAGRAM_RESEND; 3400 asconf->snd_count--; 3401 } 3402 } 3403 break; 3404 case SCTP_INITIATION: 3405 /* resend the INIT */ 3406 stcb->asoc.dropped_special_cnt++; 3407 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3408 /* 3409 * If we can get it in, in a few attempts we do 3410 * this, otherwise we let the timer fire. 3411 */ 3412 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3413 stcb, net, 3414 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3415 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3416 } 3417 break; 3418 case SCTP_SELECTIVE_ACK: 3419 case SCTP_NR_SELECTIVE_ACK: 3420 /* resend the sack */ 3421 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3422 break; 3423 case SCTP_HEARTBEAT_REQUEST: 3424 /* resend a demand HB */ 3425 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3426 /* 3427 * Only retransmit if we KNOW we wont destroy the 3428 * tcb 3429 */ 3430 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3431 } 3432 break; 3433 case SCTP_SHUTDOWN: 3434 sctp_send_shutdown(stcb, net); 3435 break; 3436 case SCTP_SHUTDOWN_ACK: 3437 sctp_send_shutdown_ack(stcb, net); 3438 break; 3439 case SCTP_COOKIE_ECHO: 3440 { 3441 struct sctp_tmit_chunk *cookie; 3442 3443 cookie = NULL; 3444 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3445 sctp_next) { 3446 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3447 break; 3448 } 3449 } 3450 if (cookie) { 3451 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3452 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3453 cookie->sent = SCTP_DATAGRAM_RESEND; 3454 sctp_stop_all_cookie_timers(stcb); 3455 } 3456 } 3457 break; 3458 case SCTP_COOKIE_ACK: 3459 sctp_send_cookie_ack(stcb); 3460 break; 3461 case SCTP_ASCONF_ACK: 3462 /* resend last asconf ack */ 3463 sctp_send_asconf_ack(stcb); 3464 break; 3465 case SCTP_IFORWARD_CUM_TSN: 3466 case SCTP_FORWARD_CUM_TSN: 3467 send_forward_tsn(stcb, &stcb->asoc); 3468 break; 3469 /* can't do anything with these */ 3470 case SCTP_PACKET_DROPPED: 3471 case SCTP_INITIATION_ACK: /* this should not happen */ 3472 case SCTP_HEARTBEAT_ACK: 3473 case SCTP_ABORT_ASSOCIATION: 3474 case SCTP_OPERATION_ERROR: 3475 case SCTP_SHUTDOWN_COMPLETE: 3476 case SCTP_ECN_ECHO: 3477 case SCTP_ECN_CWR: 3478 default: 3479 break; 3480 } 3481 return (0); 3482 } 3483 3484 void 3485 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3486 { 3487 uint32_t i; 3488 uint16_t temp; 3489 3490 /* 3491 * We set things to 0xffffffff since this is the last delivered 3492 * sequence and we will be sending in 0 after the reset. 3493 */ 3494 3495 if (number_entries) { 3496 for (i = 0; i < number_entries; i++) { 3497 temp = ntohs(list[i]); 3498 if (temp >= stcb->asoc.streamincnt) { 3499 continue; 3500 } 3501 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffffffff; 3502 } 3503 } else { 3504 list = NULL; 3505 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3506 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 3507 } 3508 } 3509 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3510 } 3511 3512 static void 3513 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3514 { 3515 uint32_t i; 3516 uint16_t temp; 3517 3518 if (number_entries > 0) { 3519 for (i = 0; i < number_entries; i++) { 3520 temp = ntohs(list[i]); 3521 if (temp >= stcb->asoc.streamoutcnt) { 3522 /* no such stream */ 3523 continue; 3524 } 3525 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3526 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3527 } 3528 } else { 3529 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3530 stcb->asoc.strmout[i].next_mid_ordered = 0; 3531 stcb->asoc.strmout[i].next_mid_unordered = 0; 3532 } 3533 } 3534 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3535 } 3536 3537 static void 3538 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3539 { 3540 uint32_t i; 3541 uint16_t temp; 3542 3543 if (number_entries > 0) { 3544 for (i = 0; i < number_entries; i++) { 3545 temp = ntohs(list[i]); 3546 if (temp >= stcb->asoc.streamoutcnt) { 3547 /* no such stream */ 3548 continue; 3549 } 3550 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3551 } 3552 } else { 3553 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3554 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3555 } 3556 } 3557 } 3558 3559 3560 struct sctp_stream_reset_request * 3561 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3562 { 3563 struct sctp_association *asoc; 3564 struct sctp_chunkhdr *ch; 3565 struct sctp_stream_reset_request *r; 3566 struct sctp_tmit_chunk *chk; 3567 int len, clen; 3568 3569 asoc = &stcb->asoc; 3570 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3571 asoc->stream_reset_outstanding = 0; 3572 return (NULL); 3573 } 3574 if (stcb->asoc.str_reset == NULL) { 3575 asoc->stream_reset_outstanding = 0; 3576 return (NULL); 3577 } 3578 chk = stcb->asoc.str_reset; 3579 if (chk->data == NULL) { 3580 return (NULL); 3581 } 3582 if (bchk) { 3583 /* he wants a copy of the chk pointer */ 3584 *bchk = chk; 3585 } 3586 clen = chk->send_size; 3587 ch = mtod(chk->data, struct sctp_chunkhdr *); 3588 r = (struct sctp_stream_reset_request *)(ch + 1); 3589 if (ntohl(r->request_seq) == seq) { 3590 /* found it */ 3591 return (r); 3592 } 3593 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3594 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3595 /* move to the next one, there can only be a max of two */ 3596 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3597 if (ntohl(r->request_seq) == seq) { 3598 return (r); 3599 } 3600 } 3601 /* that seq is not here */ 3602 return (NULL); 3603 } 3604 3605 static void 3606 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3607 { 3608 struct sctp_association *asoc; 3609 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3610 3611 if (stcb->asoc.str_reset == NULL) { 3612 return; 3613 } 3614 asoc = &stcb->asoc; 3615 3616 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3617 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3618 TAILQ_REMOVE(&asoc->control_send_queue, 3619 chk, 3620 sctp_next); 3621 if (chk->data) { 3622 sctp_m_freem(chk->data); 3623 chk->data = NULL; 3624 } 3625 asoc->ctrl_queue_cnt--; 3626 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3627 /* sa_ignore NO_NULL_CHK */ 3628 stcb->asoc.str_reset = NULL; 3629 } 3630 3631 3632 static int 3633 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3634 uint32_t seq, uint32_t action, 3635 struct sctp_stream_reset_response *respin) 3636 { 3637 uint16_t type; 3638 int lparm_len; 3639 struct sctp_association *asoc = &stcb->asoc; 3640 struct sctp_tmit_chunk *chk; 3641 struct sctp_stream_reset_request *req_param; 3642 struct sctp_stream_reset_out_request *req_out_param; 3643 struct sctp_stream_reset_in_request *req_in_param; 3644 uint32_t number_entries; 3645 3646 if (asoc->stream_reset_outstanding == 0) { 3647 /* duplicate */ 3648 return (0); 3649 } 3650 if (seq == stcb->asoc.str_reset_seq_out) { 3651 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3652 if (req_param != NULL) { 3653 stcb->asoc.str_reset_seq_out++; 3654 type = ntohs(req_param->ph.param_type); 3655 lparm_len = ntohs(req_param->ph.param_length); 3656 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3657 int no_clear = 0; 3658 3659 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3660 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3661 asoc->stream_reset_out_is_outstanding = 0; 3662 if (asoc->stream_reset_outstanding) 3663 asoc->stream_reset_outstanding--; 3664 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3665 /* do it */ 3666 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3667 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3668 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3669 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3670 /* 3671 * Set it up so we don't stop 3672 * retransmitting 3673 */ 3674 asoc->stream_reset_outstanding++; 3675 stcb->asoc.str_reset_seq_out--; 3676 asoc->stream_reset_out_is_outstanding = 1; 3677 no_clear = 1; 3678 } else { 3679 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3680 } 3681 if (no_clear == 0) { 3682 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3683 } 3684 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3685 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3686 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3687 if (asoc->stream_reset_outstanding) 3688 asoc->stream_reset_outstanding--; 3689 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3690 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3691 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3692 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3693 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3694 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3695 } 3696 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3697 /* Ok we now may have more streams */ 3698 int num_stream; 3699 3700 num_stream = stcb->asoc.strm_pending_add_size; 3701 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3702 /* TSNH */ 3703 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3704 } 3705 stcb->asoc.strm_pending_add_size = 0; 3706 if (asoc->stream_reset_outstanding) 3707 asoc->stream_reset_outstanding--; 3708 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3709 /* Put the new streams into effect */ 3710 int i; 3711 3712 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3713 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3714 } 3715 asoc->streamoutcnt += num_stream; 3716 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3717 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3718 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3719 SCTP_STREAM_CHANGE_DENIED); 3720 } else { 3721 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3722 SCTP_STREAM_CHANGE_FAILED); 3723 } 3724 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3725 if (asoc->stream_reset_outstanding) 3726 asoc->stream_reset_outstanding--; 3727 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3728 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3729 SCTP_STREAM_CHANGE_DENIED); 3730 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3731 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3732 SCTP_STREAM_CHANGE_FAILED); 3733 } 3734 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3735 /** 3736 * a) Adopt the new in tsn. 3737 * b) reset the map 3738 * c) Adopt the new out-tsn 3739 */ 3740 struct sctp_stream_reset_response_tsn *resp; 3741 struct sctp_forward_tsn_chunk fwdtsn; 3742 int abort_flag = 0; 3743 3744 if (respin == NULL) { 3745 /* huh ? */ 3746 return (0); 3747 } 3748 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3749 return (0); 3750 } 3751 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3752 resp = (struct sctp_stream_reset_response_tsn *)respin; 3753 asoc->stream_reset_outstanding--; 3754 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3755 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3756 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3757 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3758 if (abort_flag) { 3759 return (1); 3760 } 3761 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3762 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3763 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3764 } 3765 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3766 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3767 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3768 3769 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3770 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3771 3772 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3773 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3774 3775 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3776 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3777 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3778 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3779 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3780 SCTP_ASSOC_RESET_DENIED); 3781 } else { 3782 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3783 SCTP_ASSOC_RESET_FAILED); 3784 } 3785 } 3786 /* get rid of the request and get the request flags */ 3787 if (asoc->stream_reset_outstanding == 0) { 3788 sctp_clean_up_stream_reset(stcb); 3789 } 3790 } 3791 } 3792 if (asoc->stream_reset_outstanding == 0) { 3793 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3794 } 3795 return (0); 3796 } 3797 3798 static void 3799 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3800 struct sctp_tmit_chunk *chk, 3801 struct sctp_stream_reset_in_request *req, int trunc) 3802 { 3803 uint32_t seq; 3804 int len, i; 3805 int number_entries; 3806 uint16_t temp; 3807 3808 /* 3809 * peer wants me to send a str-reset to him for my outgoing seq's if 3810 * seq_in is right. 3811 */ 3812 struct sctp_association *asoc = &stcb->asoc; 3813 3814 seq = ntohl(req->request_seq); 3815 if (asoc->str_reset_seq_in == seq) { 3816 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3817 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3818 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3819 } else if (trunc) { 3820 /* Can't do it, since they exceeded our buffer size */ 3821 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3822 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3823 len = ntohs(req->ph.param_length); 3824 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3825 if (number_entries) { 3826 for (i = 0; i < number_entries; i++) { 3827 temp = ntohs(req->list_of_streams[i]); 3828 if (temp >= stcb->asoc.streamoutcnt) { 3829 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3830 goto bad_boy; 3831 } 3832 req->list_of_streams[i] = temp; 3833 } 3834 for (i = 0; i < number_entries; i++) { 3835 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3836 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3837 } 3838 } 3839 } else { 3840 /* Its all */ 3841 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3842 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3843 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3844 } 3845 } 3846 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3847 } else { 3848 /* Can't do it, since we have sent one out */ 3849 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3850 } 3851 bad_boy: 3852 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3853 asoc->str_reset_seq_in++; 3854 } else if (asoc->str_reset_seq_in - 1 == seq) { 3855 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3856 } else if (asoc->str_reset_seq_in - 2 == seq) { 3857 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3858 } else { 3859 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3860 } 3861 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3862 } 3863 3864 static int 3865 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3866 struct sctp_tmit_chunk *chk, 3867 struct sctp_stream_reset_tsn_request *req) 3868 { 3869 /* reset all in and out and update the tsn */ 3870 /* 3871 * A) reset my str-seq's on in and out. B) Select a receive next, 3872 * and set cum-ack to it. Also process this selected number as a 3873 * fwd-tsn as well. C) set in the response my next sending seq. 3874 */ 3875 struct sctp_forward_tsn_chunk fwdtsn; 3876 struct sctp_association *asoc = &stcb->asoc; 3877 int abort_flag = 0; 3878 uint32_t seq; 3879 3880 seq = ntohl(req->request_seq); 3881 if (asoc->str_reset_seq_in == seq) { 3882 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3883 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3884 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3885 } else { 3886 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3887 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3888 fwdtsn.ch.chunk_flags = 0; 3889 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3890 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3891 if (abort_flag) { 3892 return (1); 3893 } 3894 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3895 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3896 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3897 } 3898 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3899 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3900 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3901 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3902 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3903 atomic_add_int(&asoc->sending_seq, 1); 3904 /* save off historical data for retrans */ 3905 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3906 asoc->last_sending_seq[0] = asoc->sending_seq; 3907 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3908 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3909 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3910 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3911 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3912 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3913 } 3914 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3915 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3916 asoc->str_reset_seq_in++; 3917 } else if (asoc->str_reset_seq_in - 1 == seq) { 3918 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3919 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3920 } else if (asoc->str_reset_seq_in - 2 == seq) { 3921 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3922 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3923 } else { 3924 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3925 } 3926 return (0); 3927 } 3928 3929 static void 3930 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3931 struct sctp_tmit_chunk *chk, 3932 struct sctp_stream_reset_out_request *req, int trunc) 3933 { 3934 uint32_t seq, tsn; 3935 int number_entries, len; 3936 struct sctp_association *asoc = &stcb->asoc; 3937 3938 seq = ntohl(req->request_seq); 3939 3940 /* now if its not a duplicate we process it */ 3941 if (asoc->str_reset_seq_in == seq) { 3942 len = ntohs(req->ph.param_length); 3943 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3944 /* 3945 * the sender is resetting, handle the list issue.. we must 3946 * a) verify if we can do the reset, if so no problem b) If 3947 * we can't do the reset we must copy the request. c) queue 3948 * it, and setup the data in processor to trigger it off 3949 * when needed and dequeue all the queued data. 3950 */ 3951 tsn = ntohl(req->send_reset_at_tsn); 3952 3953 /* move the reset action back one */ 3954 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3955 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3956 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3957 } else if (trunc) { 3958 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3959 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3960 /* we can do it now */ 3961 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3962 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3963 } else { 3964 /* 3965 * we must queue it up and thus wait for the TSN's 3966 * to arrive that are at or before tsn 3967 */ 3968 struct sctp_stream_reset_list *liste; 3969 int siz; 3970 3971 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3972 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3973 siz, SCTP_M_STRESET); 3974 if (liste == NULL) { 3975 /* gak out of memory */ 3976 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3977 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3978 return; 3979 } 3980 liste->seq = seq; 3981 liste->tsn = tsn; 3982 liste->number_entries = number_entries; 3983 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3984 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3985 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3986 } 3987 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3988 asoc->str_reset_seq_in++; 3989 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3990 /* 3991 * one seq back, just echo back last action since my 3992 * response was lost. 3993 */ 3994 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3995 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3996 /* 3997 * two seq back, just echo back last action since my 3998 * response was lost. 3999 */ 4000 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4001 } else { 4002 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4003 } 4004 } 4005 4006 static void 4007 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4008 struct sctp_stream_reset_add_strm *str_add) 4009 { 4010 /* 4011 * Peer is requesting to add more streams. If its within our 4012 * max-streams we will allow it. 4013 */ 4014 uint32_t num_stream, i; 4015 uint32_t seq; 4016 struct sctp_association *asoc = &stcb->asoc; 4017 struct sctp_queued_to_read *ctl, *nctl; 4018 4019 /* Get the number. */ 4020 seq = ntohl(str_add->request_seq); 4021 num_stream = ntohs(str_add->number_of_streams); 4022 /* Now what would be the new total? */ 4023 if (asoc->str_reset_seq_in == seq) { 4024 num_stream += stcb->asoc.streamincnt; 4025 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4026 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4027 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4028 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4029 (num_stream > 0xffff)) { 4030 /* We must reject it they ask for to many */ 4031 denied: 4032 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4033 } else { 4034 /* Ok, we can do that :-) */ 4035 struct sctp_stream_in *oldstrm; 4036 4037 /* save off the old */ 4038 oldstrm = stcb->asoc.strmin; 4039 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4040 (num_stream * sizeof(struct sctp_stream_in)), 4041 SCTP_M_STRMI); 4042 if (stcb->asoc.strmin == NULL) { 4043 stcb->asoc.strmin = oldstrm; 4044 goto denied; 4045 } 4046 /* copy off the old data */ 4047 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4048 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4049 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4050 stcb->asoc.strmin[i].stream_no = i; 4051 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4052 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4053 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4054 /* now anything on those queues? */ 4055 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4056 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4057 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4058 } 4059 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4060 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4061 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4062 } 4063 } 4064 /* Init the new streams */ 4065 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4066 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4067 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4068 stcb->asoc.strmin[i].stream_no = i; 4069 stcb->asoc.strmin[i].last_sequence_delivered = 0xffffffff; 4070 stcb->asoc.strmin[i].pd_api_started = 0; 4071 stcb->asoc.strmin[i].delivery_started = 0; 4072 } 4073 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4074 /* update the size */ 4075 stcb->asoc.streamincnt = num_stream; 4076 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4077 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4078 } 4079 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4080 asoc->str_reset_seq_in++; 4081 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4082 /* 4083 * one seq back, just echo back last action since my 4084 * response was lost. 4085 */ 4086 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4087 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4088 /* 4089 * two seq back, just echo back last action since my 4090 * response was lost. 4091 */ 4092 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4093 } else { 4094 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4095 4096 } 4097 } 4098 4099 static void 4100 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4101 struct sctp_stream_reset_add_strm *str_add) 4102 { 4103 /* 4104 * Peer is requesting to add more streams. If its within our 4105 * max-streams we will allow it. 4106 */ 4107 uint16_t num_stream; 4108 uint32_t seq; 4109 struct sctp_association *asoc = &stcb->asoc; 4110 4111 /* Get the number. */ 4112 seq = ntohl(str_add->request_seq); 4113 num_stream = ntohs(str_add->number_of_streams); 4114 /* Now what would be the new total? */ 4115 if (asoc->str_reset_seq_in == seq) { 4116 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4117 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4118 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4119 } else if (stcb->asoc.stream_reset_outstanding) { 4120 /* We must reject it we have something pending */ 4121 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4122 } else { 4123 /* Ok, we can do that :-) */ 4124 int mychk; 4125 4126 mychk = stcb->asoc.streamoutcnt; 4127 mychk += num_stream; 4128 if (mychk < 0x10000) { 4129 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4130 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4131 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4132 } 4133 } else { 4134 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4135 } 4136 } 4137 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4138 asoc->str_reset_seq_in++; 4139 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4140 /* 4141 * one seq back, just echo back last action since my 4142 * response was lost. 4143 */ 4144 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4145 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4146 /* 4147 * two seq back, just echo back last action since my 4148 * response was lost. 4149 */ 4150 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4151 } else { 4152 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4153 } 4154 } 4155 4156 #ifdef __GNUC__ 4157 __attribute__((noinline)) 4158 #endif 4159 static int 4160 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4161 struct sctp_chunkhdr *ch_req) 4162 { 4163 uint16_t remaining_length, param_len, ptype; 4164 struct sctp_paramhdr pstore; 4165 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4166 uint32_t seq = 0; 4167 int num_req = 0; 4168 int trunc = 0; 4169 struct sctp_tmit_chunk *chk; 4170 struct sctp_chunkhdr *ch; 4171 struct sctp_paramhdr *ph; 4172 int ret_code = 0; 4173 int num_param = 0; 4174 4175 /* now it may be a reset or a reset-response */ 4176 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4177 4178 /* setup for adding the response */ 4179 sctp_alloc_a_chunk(stcb, chk); 4180 if (chk == NULL) { 4181 return (ret_code); 4182 } 4183 chk->copy_by_ref = 0; 4184 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4185 chk->rec.chunk_id.can_take_data = 0; 4186 chk->flags = 0; 4187 chk->asoc = &stcb->asoc; 4188 chk->no_fr_allowed = 0; 4189 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4190 chk->book_size_scale = 0; 4191 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4192 if (chk->data == NULL) { 4193 strres_nochunk: 4194 if (chk->data) { 4195 sctp_m_freem(chk->data); 4196 chk->data = NULL; 4197 } 4198 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4199 return (ret_code); 4200 } 4201 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4202 4203 /* setup chunk parameters */ 4204 chk->sent = SCTP_DATAGRAM_UNSENT; 4205 chk->snd_count = 0; 4206 chk->whoTo = NULL; 4207 4208 ch = mtod(chk->data, struct sctp_chunkhdr *); 4209 ch->chunk_type = SCTP_STREAM_RESET; 4210 ch->chunk_flags = 0; 4211 ch->chunk_length = htons(chk->send_size); 4212 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4213 offset += sizeof(struct sctp_chunkhdr); 4214 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4215 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4216 if (ph == NULL) { 4217 /* TSNH */ 4218 break; 4219 } 4220 param_len = ntohs(ph->param_length); 4221 if ((param_len > remaining_length) || 4222 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4223 /* bad parameter length */ 4224 break; 4225 } 4226 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4227 (uint8_t *) & cstore); 4228 if (ph == NULL) { 4229 /* TSNH */ 4230 break; 4231 } 4232 ptype = ntohs(ph->param_type); 4233 num_param++; 4234 if (param_len > sizeof(cstore)) { 4235 trunc = 1; 4236 } else { 4237 trunc = 0; 4238 } 4239 if (num_param > SCTP_MAX_RESET_PARAMS) { 4240 /* hit the max of parameters already sorry.. */ 4241 break; 4242 } 4243 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4244 struct sctp_stream_reset_out_request *req_out; 4245 4246 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4247 break; 4248 } 4249 req_out = (struct sctp_stream_reset_out_request *)ph; 4250 num_req++; 4251 if (stcb->asoc.stream_reset_outstanding) { 4252 seq = ntohl(req_out->response_seq); 4253 if (seq == stcb->asoc.str_reset_seq_out) { 4254 /* implicit ack */ 4255 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4256 } 4257 } 4258 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4259 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4260 struct sctp_stream_reset_add_strm *str_add; 4261 4262 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4263 break; 4264 } 4265 str_add = (struct sctp_stream_reset_add_strm *)ph; 4266 num_req++; 4267 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4268 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4269 struct sctp_stream_reset_add_strm *str_add; 4270 4271 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4272 break; 4273 } 4274 str_add = (struct sctp_stream_reset_add_strm *)ph; 4275 num_req++; 4276 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4277 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4278 struct sctp_stream_reset_in_request *req_in; 4279 4280 num_req++; 4281 req_in = (struct sctp_stream_reset_in_request *)ph; 4282 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4283 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4284 struct sctp_stream_reset_tsn_request *req_tsn; 4285 4286 num_req++; 4287 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4288 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4289 ret_code = 1; 4290 goto strres_nochunk; 4291 } 4292 /* no more */ 4293 break; 4294 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4295 struct sctp_stream_reset_response *resp; 4296 uint32_t result; 4297 4298 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4299 break; 4300 } 4301 resp = (struct sctp_stream_reset_response *)ph; 4302 seq = ntohl(resp->response_seq); 4303 result = ntohl(resp->result); 4304 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4305 ret_code = 1; 4306 goto strres_nochunk; 4307 } 4308 } else { 4309 break; 4310 } 4311 offset += SCTP_SIZE32(param_len); 4312 if (remaining_length >= SCTP_SIZE32(param_len)) { 4313 remaining_length -= SCTP_SIZE32(param_len); 4314 } else { 4315 remaining_length = 0; 4316 } 4317 } 4318 if (num_req == 0) { 4319 /* we have no response free the stuff */ 4320 goto strres_nochunk; 4321 } 4322 /* ok we have a chunk to link in */ 4323 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4324 chk, 4325 sctp_next); 4326 stcb->asoc.ctrl_queue_cnt++; 4327 return (ret_code); 4328 } 4329 4330 /* 4331 * Handle a router or endpoints report of a packet loss, there are two ways 4332 * to handle this, either we get the whole packet and must disect it 4333 * ourselves (possibly with truncation and or corruption) or it is a summary 4334 * from a middle box that did the disectting for us. 4335 */ 4336 static void 4337 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4338 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4339 { 4340 uint32_t bottle_bw, on_queue; 4341 uint16_t trunc_len; 4342 unsigned int chlen; 4343 unsigned int at; 4344 struct sctp_chunk_desc desc; 4345 struct sctp_chunkhdr *ch; 4346 4347 chlen = ntohs(cp->ch.chunk_length); 4348 chlen -= sizeof(struct sctp_pktdrop_chunk); 4349 /* XXX possible chlen underflow */ 4350 if (chlen == 0) { 4351 ch = NULL; 4352 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4353 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4354 } else { 4355 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4356 chlen -= sizeof(struct sctphdr); 4357 /* XXX possible chlen underflow */ 4358 memset(&desc, 0, sizeof(desc)); 4359 } 4360 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4361 if (trunc_len > limit) { 4362 trunc_len = limit; 4363 } 4364 /* now the chunks themselves */ 4365 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4366 desc.chunk_type = ch->chunk_type; 4367 /* get amount we need to move */ 4368 at = ntohs(ch->chunk_length); 4369 if (at < sizeof(struct sctp_chunkhdr)) { 4370 /* corrupt chunk, maybe at the end? */ 4371 SCTP_STAT_INCR(sctps_pdrpcrupt); 4372 break; 4373 } 4374 if (trunc_len == 0) { 4375 /* we are supposed to have all of it */ 4376 if (at > chlen) { 4377 /* corrupt skip it */ 4378 SCTP_STAT_INCR(sctps_pdrpcrupt); 4379 break; 4380 } 4381 } else { 4382 /* is there enough of it left ? */ 4383 if (desc.chunk_type == SCTP_DATA) { 4384 if (chlen < (sizeof(struct sctp_data_chunk) + 4385 sizeof(desc.data_bytes))) { 4386 break; 4387 } 4388 } else { 4389 if (chlen < sizeof(struct sctp_chunkhdr)) { 4390 break; 4391 } 4392 } 4393 } 4394 if (desc.chunk_type == SCTP_DATA) { 4395 /* can we get out the tsn? */ 4396 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4397 SCTP_STAT_INCR(sctps_pdrpmbda); 4398 4399 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4400 /* yep */ 4401 struct sctp_data_chunk *dcp; 4402 uint8_t *ddp; 4403 unsigned int iii; 4404 4405 dcp = (struct sctp_data_chunk *)ch; 4406 ddp = (uint8_t *) (dcp + 1); 4407 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4408 desc.data_bytes[iii] = ddp[iii]; 4409 } 4410 desc.tsn_ifany = dcp->dp.tsn; 4411 } else { 4412 /* nope we are done. */ 4413 SCTP_STAT_INCR(sctps_pdrpnedat); 4414 break; 4415 } 4416 } else { 4417 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4418 SCTP_STAT_INCR(sctps_pdrpmbct); 4419 } 4420 4421 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4422 SCTP_STAT_INCR(sctps_pdrppdbrk); 4423 break; 4424 } 4425 if (SCTP_SIZE32(at) > chlen) { 4426 break; 4427 } 4428 chlen -= SCTP_SIZE32(at); 4429 if (chlen < sizeof(struct sctp_chunkhdr)) { 4430 /* done, none left */ 4431 break; 4432 } 4433 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4434 } 4435 /* Now update any rwnd --- possibly */ 4436 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4437 /* From a peer, we get a rwnd report */ 4438 uint32_t a_rwnd; 4439 4440 SCTP_STAT_INCR(sctps_pdrpfehos); 4441 4442 bottle_bw = ntohl(cp->bottle_bw); 4443 on_queue = ntohl(cp->current_onq); 4444 if (bottle_bw && on_queue) { 4445 /* a rwnd report is in here */ 4446 if (bottle_bw > on_queue) 4447 a_rwnd = bottle_bw - on_queue; 4448 else 4449 a_rwnd = 0; 4450 4451 if (a_rwnd == 0) 4452 stcb->asoc.peers_rwnd = 0; 4453 else { 4454 if (a_rwnd > stcb->asoc.total_flight) { 4455 stcb->asoc.peers_rwnd = 4456 a_rwnd - stcb->asoc.total_flight; 4457 } else { 4458 stcb->asoc.peers_rwnd = 0; 4459 } 4460 if (stcb->asoc.peers_rwnd < 4461 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4462 /* SWS sender side engages */ 4463 stcb->asoc.peers_rwnd = 0; 4464 } 4465 } 4466 } 4467 } else { 4468 SCTP_STAT_INCR(sctps_pdrpfmbox); 4469 } 4470 4471 /* now middle boxes in sat networks get a cwnd bump */ 4472 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4473 (stcb->asoc.sat_t3_loss_recovery == 0) && 4474 (stcb->asoc.sat_network)) { 4475 /* 4476 * This is debatable but for sat networks it makes sense 4477 * Note if a T3 timer has went off, we will prohibit any 4478 * changes to cwnd until we exit the t3 loss recovery. 4479 */ 4480 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4481 net, cp, &bottle_bw, &on_queue); 4482 } 4483 } 4484 4485 /* 4486 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4487 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4488 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4489 * length of the complete packet outputs: - length: modified to remaining 4490 * length after control processing - netp: modified to new sctp_nets after 4491 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4492 * bad packet,...) otherwise return the tcb for this packet 4493 */ 4494 #ifdef __GNUC__ 4495 __attribute__((noinline)) 4496 #endif 4497 static struct sctp_tcb * 4498 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4499 struct sockaddr *src, struct sockaddr *dst, 4500 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4501 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4502 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4503 uint32_t vrf_id, uint16_t port) 4504 { 4505 struct sctp_association *asoc; 4506 struct mbuf *op_err; 4507 char msg[SCTP_DIAG_INFO_LEN]; 4508 uint32_t vtag_in; 4509 int num_chunks = 0; /* number of control chunks processed */ 4510 uint32_t chk_length; 4511 int ret; 4512 int abort_no_unlock = 0; 4513 int ecne_seen = 0; 4514 4515 /* 4516 * How big should this be, and should it be alloc'd? Lets try the 4517 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4518 * until we get into jumbo grams and such.. 4519 */ 4520 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4521 struct sctp_tcb *locked_tcb = stcb; 4522 int got_auth = 0; 4523 uint32_t auth_offset = 0, auth_len = 0; 4524 int auth_skipped = 0; 4525 int asconf_cnt = 0; 4526 4527 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4528 struct socket *so; 4529 4530 #endif 4531 4532 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4533 iphlen, *offset, length, (void *)stcb); 4534 4535 /* validate chunk header length... */ 4536 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4537 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4538 ntohs(ch->chunk_length)); 4539 if (locked_tcb) { 4540 SCTP_TCB_UNLOCK(locked_tcb); 4541 } 4542 return (NULL); 4543 } 4544 /* 4545 * validate the verification tag 4546 */ 4547 vtag_in = ntohl(sh->v_tag); 4548 4549 if (locked_tcb) { 4550 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4551 } 4552 if (ch->chunk_type == SCTP_INITIATION) { 4553 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4554 ntohs(ch->chunk_length), vtag_in); 4555 if (vtag_in != 0) { 4556 /* protocol error- silently discard... */ 4557 SCTP_STAT_INCR(sctps_badvtag); 4558 if (locked_tcb) { 4559 SCTP_TCB_UNLOCK(locked_tcb); 4560 } 4561 return (NULL); 4562 } 4563 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4564 /* 4565 * If there is no stcb, skip the AUTH chunk and process 4566 * later after a stcb is found (to validate the lookup was 4567 * valid. 4568 */ 4569 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4570 (stcb == NULL) && 4571 (inp->auth_supported == 1)) { 4572 /* save this chunk for later processing */ 4573 auth_skipped = 1; 4574 auth_offset = *offset; 4575 auth_len = ntohs(ch->chunk_length); 4576 4577 /* (temporarily) move past this chunk */ 4578 *offset += SCTP_SIZE32(auth_len); 4579 if (*offset >= length) { 4580 /* no more data left in the mbuf chain */ 4581 *offset = length; 4582 if (locked_tcb) { 4583 SCTP_TCB_UNLOCK(locked_tcb); 4584 } 4585 return (NULL); 4586 } 4587 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4588 sizeof(struct sctp_chunkhdr), chunk_buf); 4589 } 4590 if (ch == NULL) { 4591 /* Help */ 4592 *offset = length; 4593 if (locked_tcb) { 4594 SCTP_TCB_UNLOCK(locked_tcb); 4595 } 4596 return (NULL); 4597 } 4598 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4599 goto process_control_chunks; 4600 } 4601 /* 4602 * first check if it's an ASCONF with an unknown src addr we 4603 * need to look inside to find the association 4604 */ 4605 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4606 struct sctp_chunkhdr *asconf_ch = ch; 4607 uint32_t asconf_offset = 0, asconf_len = 0; 4608 4609 /* inp's refcount may be reduced */ 4610 SCTP_INP_INCR_REF(inp); 4611 4612 asconf_offset = *offset; 4613 do { 4614 asconf_len = ntohs(asconf_ch->chunk_length); 4615 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4616 break; 4617 stcb = sctp_findassociation_ep_asconf(m, 4618 *offset, 4619 dst, 4620 sh, &inp, netp, vrf_id); 4621 if (stcb != NULL) 4622 break; 4623 asconf_offset += SCTP_SIZE32(asconf_len); 4624 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4625 sizeof(struct sctp_chunkhdr), chunk_buf); 4626 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4627 if (stcb == NULL) { 4628 /* 4629 * reduce inp's refcount if not reduced in 4630 * sctp_findassociation_ep_asconf(). 4631 */ 4632 SCTP_INP_DECR_REF(inp); 4633 } else { 4634 locked_tcb = stcb; 4635 } 4636 4637 /* now go back and verify any auth chunk to be sure */ 4638 if (auth_skipped && (stcb != NULL)) { 4639 struct sctp_auth_chunk *auth; 4640 4641 auth = (struct sctp_auth_chunk *) 4642 sctp_m_getptr(m, auth_offset, 4643 auth_len, chunk_buf); 4644 got_auth = 1; 4645 auth_skipped = 0; 4646 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4647 auth_offset)) { 4648 /* auth HMAC failed so dump it */ 4649 *offset = length; 4650 if (locked_tcb) { 4651 SCTP_TCB_UNLOCK(locked_tcb); 4652 } 4653 return (NULL); 4654 } else { 4655 /* remaining chunks are HMAC checked */ 4656 stcb->asoc.authenticated = 1; 4657 } 4658 } 4659 } 4660 if (stcb == NULL) { 4661 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4662 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4663 msg); 4664 /* no association, so it's out of the blue... */ 4665 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4666 mflowtype, mflowid, inp->fibnum, 4667 vrf_id, port); 4668 *offset = length; 4669 if (locked_tcb) { 4670 SCTP_TCB_UNLOCK(locked_tcb); 4671 } 4672 return (NULL); 4673 } 4674 asoc = &stcb->asoc; 4675 /* ABORT and SHUTDOWN can use either v_tag... */ 4676 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4677 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4678 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4679 /* Take the T-bit always into account. */ 4680 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4681 (vtag_in == asoc->my_vtag)) || 4682 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4683 (vtag_in == asoc->peer_vtag))) { 4684 /* this is valid */ 4685 } else { 4686 /* drop this packet... */ 4687 SCTP_STAT_INCR(sctps_badvtag); 4688 if (locked_tcb) { 4689 SCTP_TCB_UNLOCK(locked_tcb); 4690 } 4691 return (NULL); 4692 } 4693 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4694 if (vtag_in != asoc->my_vtag) { 4695 /* 4696 * this could be a stale SHUTDOWN-ACK or the 4697 * peer never got the SHUTDOWN-COMPLETE and 4698 * is still hung; we have started a new asoc 4699 * but it won't complete until the shutdown 4700 * is completed 4701 */ 4702 if (locked_tcb) { 4703 SCTP_TCB_UNLOCK(locked_tcb); 4704 } 4705 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4706 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4707 msg); 4708 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4709 sh, inp, op_err, 4710 mflowtype, mflowid, fibnum, 4711 vrf_id, port); 4712 return (NULL); 4713 } 4714 } else { 4715 /* for all other chunks, vtag must match */ 4716 if (vtag_in != asoc->my_vtag) { 4717 /* invalid vtag... */ 4718 SCTPDBG(SCTP_DEBUG_INPUT3, 4719 "invalid vtag: %xh, expect %xh\n", 4720 vtag_in, asoc->my_vtag); 4721 SCTP_STAT_INCR(sctps_badvtag); 4722 if (locked_tcb) { 4723 SCTP_TCB_UNLOCK(locked_tcb); 4724 } 4725 *offset = length; 4726 return (NULL); 4727 } 4728 } 4729 } /* end if !SCTP_COOKIE_ECHO */ 4730 /* 4731 * process all control chunks... 4732 */ 4733 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4734 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4735 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4736 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4737 /* implied cookie-ack.. we must have lost the ack */ 4738 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4739 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4740 stcb->asoc.overall_error_count, 4741 0, 4742 SCTP_FROM_SCTP_INPUT, 4743 __LINE__); 4744 } 4745 stcb->asoc.overall_error_count = 0; 4746 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4747 *netp); 4748 } 4749 process_control_chunks: 4750 while (IS_SCTP_CONTROL(ch)) { 4751 /* validate chunk length */ 4752 chk_length = ntohs(ch->chunk_length); 4753 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4754 ch->chunk_type, chk_length); 4755 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4756 if (chk_length < sizeof(*ch) || 4757 (*offset + (int)chk_length) > length) { 4758 *offset = length; 4759 if (locked_tcb) { 4760 SCTP_TCB_UNLOCK(locked_tcb); 4761 } 4762 return (NULL); 4763 } 4764 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4765 /* 4766 * INIT-ACK only gets the init ack "header" portion only 4767 * because we don't have to process the peer's COOKIE. All 4768 * others get a complete chunk. 4769 */ 4770 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4771 (ch->chunk_type == SCTP_INITIATION)) { 4772 /* get an init-ack chunk */ 4773 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4774 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4775 if (ch == NULL) { 4776 *offset = length; 4777 if (locked_tcb) { 4778 SCTP_TCB_UNLOCK(locked_tcb); 4779 } 4780 return (NULL); 4781 } 4782 } else { 4783 /* For cookies and all other chunks. */ 4784 if (chk_length > sizeof(chunk_buf)) { 4785 /* 4786 * use just the size of the chunk buffer so 4787 * the front part of our chunks fit in 4788 * contiguous space up to the chunk buffer 4789 * size (508 bytes). For chunks that need to 4790 * get more than that they must use the 4791 * sctp_m_getptr() function or other means 4792 * (e.g. know how to parse mbuf chains). 4793 * Cookies do this already. 4794 */ 4795 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4796 (sizeof(chunk_buf) - 4), 4797 chunk_buf); 4798 if (ch == NULL) { 4799 *offset = length; 4800 if (locked_tcb) { 4801 SCTP_TCB_UNLOCK(locked_tcb); 4802 } 4803 return (NULL); 4804 } 4805 } else { 4806 /* We can fit it all */ 4807 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4808 chk_length, chunk_buf); 4809 if (ch == NULL) { 4810 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4811 *offset = length; 4812 if (locked_tcb) { 4813 SCTP_TCB_UNLOCK(locked_tcb); 4814 } 4815 return (NULL); 4816 } 4817 } 4818 } 4819 num_chunks++; 4820 /* Save off the last place we got a control from */ 4821 if (stcb != NULL) { 4822 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4823 /* 4824 * allow last_control to be NULL if 4825 * ASCONF... ASCONF processing will find the 4826 * right net later 4827 */ 4828 if ((netp != NULL) && (*netp != NULL)) 4829 stcb->asoc.last_control_chunk_from = *netp; 4830 } 4831 } 4832 #ifdef SCTP_AUDITING_ENABLED 4833 sctp_audit_log(0xB0, ch->chunk_type); 4834 #endif 4835 4836 /* check to see if this chunk required auth, but isn't */ 4837 if ((stcb != NULL) && 4838 (stcb->asoc.auth_supported == 1) && 4839 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4840 !stcb->asoc.authenticated) { 4841 /* "silently" ignore */ 4842 SCTP_STAT_INCR(sctps_recvauthmissing); 4843 goto next_chunk; 4844 } 4845 switch (ch->chunk_type) { 4846 case SCTP_INITIATION: 4847 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4848 /* The INIT chunk must be the only chunk. */ 4849 if ((num_chunks > 1) || 4850 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4851 /* RFC 4960 requires that no ABORT is sent */ 4852 *offset = length; 4853 if (locked_tcb) { 4854 SCTP_TCB_UNLOCK(locked_tcb); 4855 } 4856 return (NULL); 4857 } 4858 /* Honor our resource limit. */ 4859 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4860 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4861 sctp_abort_association(inp, stcb, m, iphlen, 4862 src, dst, sh, op_err, 4863 mflowtype, mflowid, 4864 vrf_id, port); 4865 *offset = length; 4866 return (NULL); 4867 } 4868 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4869 (struct sctp_init_chunk *)ch, inp, 4870 stcb, *netp, &abort_no_unlock, 4871 mflowtype, mflowid, 4872 vrf_id, port); 4873 *offset = length; 4874 if ((!abort_no_unlock) && (locked_tcb)) { 4875 SCTP_TCB_UNLOCK(locked_tcb); 4876 } 4877 return (NULL); 4878 break; 4879 case SCTP_PAD_CHUNK: 4880 break; 4881 case SCTP_INITIATION_ACK: 4882 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4883 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4884 /* We are not interested anymore */ 4885 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4886 ; 4887 } else { 4888 if ((locked_tcb != NULL) && (locked_tcb != stcb)) { 4889 /* Very unlikely */ 4890 SCTP_TCB_UNLOCK(locked_tcb); 4891 } 4892 *offset = length; 4893 if (stcb) { 4894 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4895 so = SCTP_INP_SO(inp); 4896 atomic_add_int(&stcb->asoc.refcnt, 1); 4897 SCTP_TCB_UNLOCK(stcb); 4898 SCTP_SOCKET_LOCK(so, 1); 4899 SCTP_TCB_LOCK(stcb); 4900 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4901 #endif 4902 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4903 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4904 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4905 SCTP_SOCKET_UNLOCK(so, 1); 4906 #endif 4907 } 4908 return (NULL); 4909 } 4910 } 4911 /* The INIT-ACK chunk must be the only chunk. */ 4912 if ((num_chunks > 1) || 4913 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4914 *offset = length; 4915 if (locked_tcb) { 4916 SCTP_TCB_UNLOCK(locked_tcb); 4917 } 4918 return (NULL); 4919 } 4920 if ((netp) && (*netp)) { 4921 ret = sctp_handle_init_ack(m, iphlen, *offset, 4922 src, dst, sh, 4923 (struct sctp_init_ack_chunk *)ch, 4924 stcb, *netp, 4925 &abort_no_unlock, 4926 mflowtype, mflowid, 4927 vrf_id); 4928 } else { 4929 ret = -1; 4930 } 4931 *offset = length; 4932 if (abort_no_unlock) { 4933 return (NULL); 4934 } 4935 /* 4936 * Special case, I must call the output routine to 4937 * get the cookie echoed 4938 */ 4939 if ((stcb != NULL) && (ret == 0)) { 4940 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4941 } 4942 if (locked_tcb) { 4943 SCTP_TCB_UNLOCK(locked_tcb); 4944 } 4945 return (NULL); 4946 break; 4947 case SCTP_SELECTIVE_ACK: 4948 { 4949 struct sctp_sack_chunk *sack; 4950 int abort_now = 0; 4951 uint32_t a_rwnd, cum_ack; 4952 uint16_t num_seg, num_dup; 4953 uint8_t flags; 4954 int offset_seg, offset_dup; 4955 4956 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4957 SCTP_STAT_INCR(sctps_recvsacks); 4958 if (stcb == NULL) { 4959 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4960 break; 4961 } 4962 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4963 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4964 break; 4965 } 4966 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4967 /*- 4968 * If we have sent a shutdown-ack, we will pay no 4969 * attention to a sack sent in to us since 4970 * we don't care anymore. 4971 */ 4972 break; 4973 } 4974 sack = (struct sctp_sack_chunk *)ch; 4975 flags = ch->chunk_flags; 4976 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4977 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4978 num_dup = ntohs(sack->sack.num_dup_tsns); 4979 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4980 if (sizeof(struct sctp_sack_chunk) + 4981 num_seg * sizeof(struct sctp_gap_ack_block) + 4982 num_dup * sizeof(uint32_t) != chk_length) { 4983 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4984 break; 4985 } 4986 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4987 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4988 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4989 cum_ack, num_seg, a_rwnd); 4990 stcb->asoc.seen_a_sack_this_pkt = 1; 4991 if ((stcb->asoc.pr_sctp_cnt == 0) && 4992 (num_seg == 0) && 4993 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4994 (stcb->asoc.saw_sack_with_frags == 0) && 4995 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4996 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4997 ) { 4998 /* 4999 * We have a SIMPLE sack having no 5000 * prior segments and data on sent 5001 * queue to be acked.. Use the 5002 * faster path sack processing. We 5003 * also allow window update sacks 5004 * with no missing segments to go 5005 * this way too. 5006 */ 5007 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 5008 } else { 5009 if (netp && *netp) 5010 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5011 num_seg, 0, num_dup, &abort_now, flags, 5012 cum_ack, a_rwnd, ecne_seen); 5013 } 5014 if (abort_now) { 5015 /* ABORT signal from sack processing */ 5016 *offset = length; 5017 return (NULL); 5018 } 5019 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5020 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5021 (stcb->asoc.stream_queue_cnt == 0)) { 5022 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5023 } 5024 } 5025 break; 5026 /* 5027 * EY - nr_sack: If the received chunk is an 5028 * nr_sack chunk 5029 */ 5030 case SCTP_NR_SELECTIVE_ACK: 5031 { 5032 struct sctp_nr_sack_chunk *nr_sack; 5033 int abort_now = 0; 5034 uint32_t a_rwnd, cum_ack; 5035 uint16_t num_seg, num_nr_seg, num_dup; 5036 uint8_t flags; 5037 int offset_seg, offset_dup; 5038 5039 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5040 SCTP_STAT_INCR(sctps_recvsacks); 5041 if (stcb == NULL) { 5042 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5043 break; 5044 } 5045 if (stcb->asoc.nrsack_supported == 0) { 5046 goto unknown_chunk; 5047 } 5048 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5049 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5050 break; 5051 } 5052 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5053 /*- 5054 * If we have sent a shutdown-ack, we will pay no 5055 * attention to a sack sent in to us since 5056 * we don't care anymore. 5057 */ 5058 break; 5059 } 5060 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5061 flags = ch->chunk_flags; 5062 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5063 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5064 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5065 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5066 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5067 if (sizeof(struct sctp_nr_sack_chunk) + 5068 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5069 num_dup * sizeof(uint32_t) != chk_length) { 5070 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5071 break; 5072 } 5073 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5074 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5075 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5076 cum_ack, num_seg, a_rwnd); 5077 stcb->asoc.seen_a_sack_this_pkt = 1; 5078 if ((stcb->asoc.pr_sctp_cnt == 0) && 5079 (num_seg == 0) && (num_nr_seg == 0) && 5080 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5081 (stcb->asoc.saw_sack_with_frags == 0) && 5082 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5083 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5084 /* 5085 * We have a SIMPLE sack having no 5086 * prior segments and data on sent 5087 * queue to be acked. Use the faster 5088 * path sack processing. We also 5089 * allow window update sacks with no 5090 * missing segments to go this way 5091 * too. 5092 */ 5093 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5094 &abort_now, ecne_seen); 5095 } else { 5096 if (netp && *netp) 5097 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5098 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5099 cum_ack, a_rwnd, ecne_seen); 5100 } 5101 if (abort_now) { 5102 /* ABORT signal from sack processing */ 5103 *offset = length; 5104 return (NULL); 5105 } 5106 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5107 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5108 (stcb->asoc.stream_queue_cnt == 0)) { 5109 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5110 } 5111 } 5112 break; 5113 5114 case SCTP_HEARTBEAT_REQUEST: 5115 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5116 if ((stcb) && netp && *netp) { 5117 SCTP_STAT_INCR(sctps_recvheartbeat); 5118 sctp_send_heartbeat_ack(stcb, m, *offset, 5119 chk_length, *netp); 5120 5121 /* He's alive so give him credit */ 5122 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5123 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5124 stcb->asoc.overall_error_count, 5125 0, 5126 SCTP_FROM_SCTP_INPUT, 5127 __LINE__); 5128 } 5129 stcb->asoc.overall_error_count = 0; 5130 } 5131 break; 5132 case SCTP_HEARTBEAT_ACK: 5133 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5134 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5135 /* Its not ours */ 5136 *offset = length; 5137 if (locked_tcb) { 5138 SCTP_TCB_UNLOCK(locked_tcb); 5139 } 5140 return (NULL); 5141 } 5142 /* He's alive so give him credit */ 5143 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5144 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5145 stcb->asoc.overall_error_count, 5146 0, 5147 SCTP_FROM_SCTP_INPUT, 5148 __LINE__); 5149 } 5150 stcb->asoc.overall_error_count = 0; 5151 SCTP_STAT_INCR(sctps_recvheartbeatack); 5152 if (netp && *netp) 5153 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5154 stcb, *netp); 5155 break; 5156 case SCTP_ABORT_ASSOCIATION: 5157 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5158 (void *)stcb); 5159 if ((stcb) && netp && *netp) 5160 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5161 stcb, *netp); 5162 *offset = length; 5163 return (NULL); 5164 break; 5165 case SCTP_SHUTDOWN: 5166 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5167 (void *)stcb); 5168 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5169 *offset = length; 5170 if (locked_tcb) { 5171 SCTP_TCB_UNLOCK(locked_tcb); 5172 } 5173 return (NULL); 5174 } 5175 if (netp && *netp) { 5176 int abort_flag = 0; 5177 5178 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5179 stcb, *netp, &abort_flag); 5180 if (abort_flag) { 5181 *offset = length; 5182 return (NULL); 5183 } 5184 } 5185 break; 5186 case SCTP_SHUTDOWN_ACK: 5187 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5188 if ((stcb) && (netp) && (*netp)) 5189 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5190 *offset = length; 5191 return (NULL); 5192 break; 5193 5194 case SCTP_OPERATION_ERROR: 5195 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5196 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5197 *offset = length; 5198 return (NULL); 5199 } 5200 break; 5201 case SCTP_COOKIE_ECHO: 5202 SCTPDBG(SCTP_DEBUG_INPUT3, 5203 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5204 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5205 ; 5206 } else { 5207 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5208 /* We are not interested anymore */ 5209 abend: 5210 if (stcb) { 5211 SCTP_TCB_UNLOCK(stcb); 5212 } 5213 *offset = length; 5214 return (NULL); 5215 } 5216 } 5217 /* 5218 * First are we accepting? We do this again here 5219 * since it is possible that a previous endpoint WAS 5220 * listening responded to a INIT-ACK and then 5221 * closed. We opened and bound.. and are now no 5222 * longer listening. 5223 */ 5224 5225 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5226 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5227 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5228 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5229 sctp_abort_association(inp, stcb, m, iphlen, 5230 src, dst, sh, op_err, 5231 mflowtype, mflowid, 5232 vrf_id, port); 5233 } 5234 *offset = length; 5235 return (NULL); 5236 } else { 5237 struct mbuf *ret_buf; 5238 struct sctp_inpcb *linp; 5239 5240 if (stcb) { 5241 linp = NULL; 5242 } else { 5243 linp = inp; 5244 } 5245 5246 if (linp) { 5247 SCTP_ASOC_CREATE_LOCK(linp); 5248 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5249 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5250 SCTP_ASOC_CREATE_UNLOCK(linp); 5251 goto abend; 5252 } 5253 } 5254 if (netp) { 5255 ret_buf = 5256 sctp_handle_cookie_echo(m, iphlen, 5257 *offset, 5258 src, dst, 5259 sh, 5260 (struct sctp_cookie_echo_chunk *)ch, 5261 &inp, &stcb, netp, 5262 auth_skipped, 5263 auth_offset, 5264 auth_len, 5265 &locked_tcb, 5266 mflowtype, 5267 mflowid, 5268 vrf_id, 5269 port); 5270 } else { 5271 ret_buf = NULL; 5272 } 5273 if (linp) { 5274 SCTP_ASOC_CREATE_UNLOCK(linp); 5275 } 5276 if (ret_buf == NULL) { 5277 if (locked_tcb) { 5278 SCTP_TCB_UNLOCK(locked_tcb); 5279 } 5280 SCTPDBG(SCTP_DEBUG_INPUT3, 5281 "GAK, null buffer\n"); 5282 *offset = length; 5283 return (NULL); 5284 } 5285 /* if AUTH skipped, see if it verified... */ 5286 if (auth_skipped) { 5287 got_auth = 1; 5288 auth_skipped = 0; 5289 } 5290 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5291 /* 5292 * Restart the timer if we have 5293 * pending data 5294 */ 5295 struct sctp_tmit_chunk *chk; 5296 5297 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5298 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5299 } 5300 } 5301 break; 5302 case SCTP_COOKIE_ACK: 5303 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5304 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5305 if (locked_tcb) { 5306 SCTP_TCB_UNLOCK(locked_tcb); 5307 } 5308 return (NULL); 5309 } 5310 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5311 /* We are not interested anymore */ 5312 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5313 ; 5314 } else if (stcb) { 5315 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5316 so = SCTP_INP_SO(inp); 5317 atomic_add_int(&stcb->asoc.refcnt, 1); 5318 SCTP_TCB_UNLOCK(stcb); 5319 SCTP_SOCKET_LOCK(so, 1); 5320 SCTP_TCB_LOCK(stcb); 5321 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5322 #endif 5323 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5324 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5325 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5326 SCTP_SOCKET_UNLOCK(so, 1); 5327 #endif 5328 *offset = length; 5329 return (NULL); 5330 } 5331 } 5332 /* He's alive so give him credit */ 5333 if ((stcb) && netp && *netp) { 5334 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5335 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5336 stcb->asoc.overall_error_count, 5337 0, 5338 SCTP_FROM_SCTP_INPUT, 5339 __LINE__); 5340 } 5341 stcb->asoc.overall_error_count = 0; 5342 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5343 } 5344 break; 5345 case SCTP_ECN_ECHO: 5346 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5347 /* He's alive so give him credit */ 5348 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5349 /* Its not ours */ 5350 if (locked_tcb) { 5351 SCTP_TCB_UNLOCK(locked_tcb); 5352 } 5353 *offset = length; 5354 return (NULL); 5355 } 5356 if (stcb) { 5357 if (stcb->asoc.ecn_supported == 0) { 5358 goto unknown_chunk; 5359 } 5360 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5361 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5362 stcb->asoc.overall_error_count, 5363 0, 5364 SCTP_FROM_SCTP_INPUT, 5365 __LINE__); 5366 } 5367 stcb->asoc.overall_error_count = 0; 5368 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5369 stcb); 5370 ecne_seen = 1; 5371 } 5372 break; 5373 case SCTP_ECN_CWR: 5374 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5375 /* He's alive so give him credit */ 5376 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5377 /* Its not ours */ 5378 if (locked_tcb) { 5379 SCTP_TCB_UNLOCK(locked_tcb); 5380 } 5381 *offset = length; 5382 return (NULL); 5383 } 5384 if (stcb) { 5385 if (stcb->asoc.ecn_supported == 0) { 5386 goto unknown_chunk; 5387 } 5388 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5389 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5390 stcb->asoc.overall_error_count, 5391 0, 5392 SCTP_FROM_SCTP_INPUT, 5393 __LINE__); 5394 } 5395 stcb->asoc.overall_error_count = 0; 5396 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5397 } 5398 break; 5399 case SCTP_SHUTDOWN_COMPLETE: 5400 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5401 /* must be first and only chunk */ 5402 if ((num_chunks > 1) || 5403 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5404 *offset = length; 5405 if (locked_tcb) { 5406 SCTP_TCB_UNLOCK(locked_tcb); 5407 } 5408 return (NULL); 5409 } 5410 if ((stcb) && netp && *netp) { 5411 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5412 stcb, *netp); 5413 } 5414 *offset = length; 5415 return (NULL); 5416 break; 5417 case SCTP_ASCONF: 5418 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5419 /* He's alive so give him credit */ 5420 if (stcb) { 5421 if (stcb->asoc.asconf_supported == 0) { 5422 goto unknown_chunk; 5423 } 5424 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5425 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5426 stcb->asoc.overall_error_count, 5427 0, 5428 SCTP_FROM_SCTP_INPUT, 5429 __LINE__); 5430 } 5431 stcb->asoc.overall_error_count = 0; 5432 sctp_handle_asconf(m, *offset, src, 5433 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5434 asconf_cnt++; 5435 } 5436 break; 5437 case SCTP_ASCONF_ACK: 5438 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5439 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5440 /* Its not ours */ 5441 if (locked_tcb) { 5442 SCTP_TCB_UNLOCK(locked_tcb); 5443 } 5444 *offset = length; 5445 return (NULL); 5446 } 5447 if ((stcb) && netp && *netp) { 5448 if (stcb->asoc.asconf_supported == 0) { 5449 goto unknown_chunk; 5450 } 5451 /* He's alive so give him credit */ 5452 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5453 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5454 stcb->asoc.overall_error_count, 5455 0, 5456 SCTP_FROM_SCTP_INPUT, 5457 __LINE__); 5458 } 5459 stcb->asoc.overall_error_count = 0; 5460 sctp_handle_asconf_ack(m, *offset, 5461 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5462 if (abort_no_unlock) 5463 return (NULL); 5464 } 5465 break; 5466 case SCTP_FORWARD_CUM_TSN: 5467 case SCTP_IFORWARD_CUM_TSN: 5468 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5469 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5470 /* Its not ours */ 5471 if (locked_tcb) { 5472 SCTP_TCB_UNLOCK(locked_tcb); 5473 } 5474 *offset = length; 5475 return (NULL); 5476 } 5477 /* He's alive so give him credit */ 5478 if (stcb) { 5479 int abort_flag = 0; 5480 5481 if (stcb->asoc.prsctp_supported == 0) { 5482 goto unknown_chunk; 5483 } 5484 stcb->asoc.overall_error_count = 0; 5485 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5486 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5487 stcb->asoc.overall_error_count, 5488 0, 5489 SCTP_FROM_SCTP_INPUT, 5490 __LINE__); 5491 } 5492 *fwd_tsn_seen = 1; 5493 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5494 /* We are not interested anymore */ 5495 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5496 so = SCTP_INP_SO(inp); 5497 atomic_add_int(&stcb->asoc.refcnt, 1); 5498 SCTP_TCB_UNLOCK(stcb); 5499 SCTP_SOCKET_LOCK(so, 1); 5500 SCTP_TCB_LOCK(stcb); 5501 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5502 #endif 5503 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5504 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5505 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5506 SCTP_SOCKET_UNLOCK(so, 1); 5507 #endif 5508 *offset = length; 5509 return (NULL); 5510 } 5511 sctp_handle_forward_tsn(stcb, 5512 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5513 if (abort_flag) { 5514 *offset = length; 5515 return (NULL); 5516 } else { 5517 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5518 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5519 stcb->asoc.overall_error_count, 5520 0, 5521 SCTP_FROM_SCTP_INPUT, 5522 __LINE__); 5523 } 5524 stcb->asoc.overall_error_count = 0; 5525 } 5526 5527 } 5528 break; 5529 case SCTP_STREAM_RESET: 5530 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5531 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5532 /* Its not ours */ 5533 if (locked_tcb) { 5534 SCTP_TCB_UNLOCK(locked_tcb); 5535 } 5536 *offset = length; 5537 return (NULL); 5538 } 5539 if (stcb->asoc.reconfig_supported == 0) { 5540 goto unknown_chunk; 5541 } 5542 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5543 /* stop processing */ 5544 *offset = length; 5545 return (NULL); 5546 } 5547 break; 5548 case SCTP_PACKET_DROPPED: 5549 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5550 /* re-get it all please */ 5551 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5552 /* Its not ours */ 5553 if (locked_tcb) { 5554 SCTP_TCB_UNLOCK(locked_tcb); 5555 } 5556 *offset = length; 5557 return (NULL); 5558 } 5559 if (ch && (stcb) && netp && (*netp)) { 5560 if (stcb->asoc.pktdrop_supported == 0) { 5561 goto unknown_chunk; 5562 } 5563 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5564 stcb, *netp, 5565 min(chk_length, (sizeof(chunk_buf) - 4))); 5566 5567 } 5568 break; 5569 case SCTP_AUTHENTICATION: 5570 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5571 if (stcb == NULL) { 5572 /* save the first AUTH for later processing */ 5573 if (auth_skipped == 0) { 5574 auth_offset = *offset; 5575 auth_len = chk_length; 5576 auth_skipped = 1; 5577 } 5578 /* skip this chunk (temporarily) */ 5579 goto next_chunk; 5580 } 5581 if (stcb->asoc.auth_supported == 0) { 5582 goto unknown_chunk; 5583 } 5584 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5585 (chk_length > (sizeof(struct sctp_auth_chunk) + 5586 SCTP_AUTH_DIGEST_LEN_MAX))) { 5587 /* Its not ours */ 5588 if (locked_tcb) { 5589 SCTP_TCB_UNLOCK(locked_tcb); 5590 } 5591 *offset = length; 5592 return (NULL); 5593 } 5594 if (got_auth == 1) { 5595 /* skip this chunk... it's already auth'd */ 5596 goto next_chunk; 5597 } 5598 got_auth = 1; 5599 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5600 m, *offset)) { 5601 /* auth HMAC failed so dump the packet */ 5602 *offset = length; 5603 return (stcb); 5604 } else { 5605 /* remaining chunks are HMAC checked */ 5606 stcb->asoc.authenticated = 1; 5607 } 5608 break; 5609 5610 default: 5611 unknown_chunk: 5612 /* it's an unknown chunk! */ 5613 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5614 struct sctp_gen_error_cause *cause; 5615 int len; 5616 5617 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5618 0, M_NOWAIT, 1, MT_DATA); 5619 if (op_err != NULL) { 5620 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5621 cause = mtod(op_err, struct sctp_gen_error_cause *); 5622 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5623 cause->length = htons((uint16_t) (len + sizeof(struct sctp_gen_error_cause))); 5624 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5625 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5626 if (SCTP_BUF_NEXT(op_err) != NULL) { 5627 #ifdef SCTP_MBUF_LOGGING 5628 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5629 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5630 } 5631 #endif 5632 sctp_queue_op_err(stcb, op_err); 5633 } else { 5634 sctp_m_freem(op_err); 5635 } 5636 } 5637 } 5638 if ((ch->chunk_type & 0x80) == 0) { 5639 /* discard this packet */ 5640 *offset = length; 5641 return (stcb); 5642 } /* else skip this bad chunk and continue... */ 5643 break; 5644 } /* switch (ch->chunk_type) */ 5645 5646 5647 next_chunk: 5648 /* get the next chunk */ 5649 *offset += SCTP_SIZE32(chk_length); 5650 if (*offset >= length) { 5651 /* no more data left in the mbuf chain */ 5652 break; 5653 } 5654 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5655 sizeof(struct sctp_chunkhdr), chunk_buf); 5656 if (ch == NULL) { 5657 if (locked_tcb) { 5658 SCTP_TCB_UNLOCK(locked_tcb); 5659 } 5660 *offset = length; 5661 return (NULL); 5662 } 5663 } /* while */ 5664 5665 if (asconf_cnt > 0 && stcb != NULL) { 5666 sctp_send_asconf_ack(stcb); 5667 } 5668 return (stcb); 5669 } 5670 5671 5672 /* 5673 * common input chunk processing (v4 and v6) 5674 */ 5675 void 5676 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5677 struct sockaddr *src, struct sockaddr *dst, 5678 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5679 #if !defined(SCTP_WITH_NO_CSUM) 5680 uint8_t compute_crc, 5681 #endif 5682 uint8_t ecn_bits, 5683 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5684 uint32_t vrf_id, uint16_t port) 5685 { 5686 uint32_t high_tsn; 5687 int fwd_tsn_seen = 0, data_processed = 0; 5688 struct mbuf *m = *mm, *op_err; 5689 char msg[SCTP_DIAG_INFO_LEN]; 5690 int un_sent; 5691 int cnt_ctrl_ready = 0; 5692 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5693 struct sctp_tcb *stcb = NULL; 5694 struct sctp_nets *net = NULL; 5695 5696 SCTP_STAT_INCR(sctps_recvdatagrams); 5697 #ifdef SCTP_AUDITING_ENABLED 5698 sctp_audit_log(0xE0, 1); 5699 sctp_auditing(0, inp, stcb, net); 5700 #endif 5701 #if !defined(SCTP_WITH_NO_CSUM) 5702 if (compute_crc != 0) { 5703 uint32_t check, calc_check; 5704 5705 check = sh->checksum; 5706 sh->checksum = 0; 5707 calc_check = sctp_calculate_cksum(m, iphlen); 5708 sh->checksum = check; 5709 if (calc_check != check) { 5710 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5711 calc_check, check, (void *)m, length, iphlen); 5712 stcb = sctp_findassociation_addr(m, offset, src, dst, 5713 sh, ch, &inp, &net, vrf_id); 5714 #if defined(INET) || defined(INET6) 5715 if ((ch->chunk_type != SCTP_INITIATION) && 5716 (net != NULL) && (net->port != port)) { 5717 if (net->port == 0) { 5718 /* UDP encapsulation turned on. */ 5719 net->mtu -= sizeof(struct udphdr); 5720 if (stcb->asoc.smallest_mtu > net->mtu) { 5721 sctp_pathmtu_adjustment(stcb, net->mtu); 5722 } 5723 } else if (port == 0) { 5724 /* UDP encapsulation turned off. */ 5725 net->mtu += sizeof(struct udphdr); 5726 /* XXX Update smallest_mtu */ 5727 } 5728 net->port = port; 5729 } 5730 #endif 5731 if (net != NULL) { 5732 net->flowtype = mflowtype; 5733 net->flowid = mflowid; 5734 } 5735 if ((inp != NULL) && (stcb != NULL)) { 5736 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5737 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5738 } else if ((inp != NULL) && (stcb == NULL)) { 5739 inp_decr = inp; 5740 } 5741 SCTP_STAT_INCR(sctps_badsum); 5742 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5743 goto out; 5744 } 5745 } 5746 #endif 5747 /* Destination port of 0 is illegal, based on RFC4960. */ 5748 if (sh->dest_port == 0) { 5749 SCTP_STAT_INCR(sctps_hdrops); 5750 goto out; 5751 } 5752 stcb = sctp_findassociation_addr(m, offset, src, dst, 5753 sh, ch, &inp, &net, vrf_id); 5754 #if defined(INET) || defined(INET6) 5755 if ((ch->chunk_type != SCTP_INITIATION) && 5756 (net != NULL) && (net->port != port)) { 5757 if (net->port == 0) { 5758 /* UDP encapsulation turned on. */ 5759 net->mtu -= sizeof(struct udphdr); 5760 if (stcb->asoc.smallest_mtu > net->mtu) { 5761 sctp_pathmtu_adjustment(stcb, net->mtu); 5762 } 5763 } else if (port == 0) { 5764 /* UDP encapsulation turned off. */ 5765 net->mtu += sizeof(struct udphdr); 5766 /* XXX Update smallest_mtu */ 5767 } 5768 net->port = port; 5769 } 5770 #endif 5771 if (net != NULL) { 5772 net->flowtype = mflowtype; 5773 net->flowid = mflowid; 5774 } 5775 if (inp == NULL) { 5776 SCTP_STAT_INCR(sctps_noport); 5777 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5778 goto out; 5779 } 5780 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5781 sctp_send_shutdown_complete2(src, dst, sh, 5782 mflowtype, mflowid, fibnum, 5783 vrf_id, port); 5784 goto out; 5785 } 5786 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5787 goto out; 5788 } 5789 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5790 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5791 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5792 (ch->chunk_type != SCTP_INIT))) { 5793 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5794 "Out of the blue"); 5795 sctp_send_abort(m, iphlen, src, dst, 5796 sh, 0, op_err, 5797 mflowtype, mflowid, fibnum, 5798 vrf_id, port); 5799 } 5800 } 5801 goto out; 5802 } else if (stcb == NULL) { 5803 inp_decr = inp; 5804 } 5805 #ifdef IPSEC 5806 /*- 5807 * I very much doubt any of the IPSEC stuff will work but I have no 5808 * idea, so I will leave it in place. 5809 */ 5810 if (inp != NULL) { 5811 switch (dst->sa_family) { 5812 #ifdef INET 5813 case AF_INET: 5814 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5815 SCTP_STAT_INCR(sctps_hdrops); 5816 goto out; 5817 } 5818 break; 5819 #endif 5820 #ifdef INET6 5821 case AF_INET6: 5822 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5823 SCTP_STAT_INCR(sctps_hdrops); 5824 goto out; 5825 } 5826 break; 5827 #endif 5828 default: 5829 break; 5830 } 5831 } 5832 #endif 5833 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5834 (void *)m, iphlen, offset, length, (void *)stcb); 5835 if (stcb) { 5836 /* always clear this before beginning a packet */ 5837 stcb->asoc.authenticated = 0; 5838 stcb->asoc.seen_a_sack_this_pkt = 0; 5839 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5840 (void *)stcb, stcb->asoc.state); 5841 5842 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5843 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5844 /*- 5845 * If we hit here, we had a ref count 5846 * up when the assoc was aborted and the 5847 * timer is clearing out the assoc, we should 5848 * NOT respond to any packet.. its OOTB. 5849 */ 5850 SCTP_TCB_UNLOCK(stcb); 5851 stcb = NULL; 5852 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5853 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5854 msg); 5855 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5856 mflowtype, mflowid, inp->fibnum, 5857 vrf_id, port); 5858 goto out; 5859 } 5860 } 5861 if (IS_SCTP_CONTROL(ch)) { 5862 /* process the control portion of the SCTP packet */ 5863 /* sa_ignore NO_NULL_CHK */ 5864 stcb = sctp_process_control(m, iphlen, &offset, length, 5865 src, dst, sh, ch, 5866 inp, stcb, &net, &fwd_tsn_seen, 5867 mflowtype, mflowid, fibnum, 5868 vrf_id, port); 5869 if (stcb) { 5870 /* 5871 * This covers us if the cookie-echo was there and 5872 * it changes our INP. 5873 */ 5874 inp = stcb->sctp_ep; 5875 #if defined(INET) || defined(INET6) 5876 if ((ch->chunk_type != SCTP_INITIATION) && 5877 (net != NULL) && (net->port != port)) { 5878 if (net->port == 0) { 5879 /* UDP encapsulation turned on. */ 5880 net->mtu -= sizeof(struct udphdr); 5881 if (stcb->asoc.smallest_mtu > net->mtu) { 5882 sctp_pathmtu_adjustment(stcb, net->mtu); 5883 } 5884 } else if (port == 0) { 5885 /* UDP encapsulation turned off. */ 5886 net->mtu += sizeof(struct udphdr); 5887 /* XXX Update smallest_mtu */ 5888 } 5889 net->port = port; 5890 } 5891 #endif 5892 } 5893 } else { 5894 /* 5895 * no control chunks, so pre-process DATA chunks (these 5896 * checks are taken care of by control processing) 5897 */ 5898 5899 /* 5900 * if DATA only packet, and auth is required, then punt... 5901 * can't have authenticated without any AUTH (control) 5902 * chunks 5903 */ 5904 if ((stcb != NULL) && 5905 (stcb->asoc.auth_supported == 1) && 5906 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5907 /* "silently" ignore */ 5908 SCTP_STAT_INCR(sctps_recvauthmissing); 5909 goto out; 5910 } 5911 if (stcb == NULL) { 5912 /* out of the blue DATA chunk */ 5913 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5914 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5915 msg); 5916 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5917 mflowtype, mflowid, fibnum, 5918 vrf_id, port); 5919 goto out; 5920 } 5921 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5922 /* v_tag mismatch! */ 5923 SCTP_STAT_INCR(sctps_badvtag); 5924 goto out; 5925 } 5926 } 5927 5928 if (stcb == NULL) { 5929 /* 5930 * no valid TCB for this packet, or we found it's a bad 5931 * packet while processing control, or we're done with this 5932 * packet (done or skip rest of data), so we drop it... 5933 */ 5934 goto out; 5935 } 5936 /* 5937 * DATA chunk processing 5938 */ 5939 /* plow through the data chunks while length > offset */ 5940 5941 /* 5942 * Rest should be DATA only. Check authentication state if AUTH for 5943 * DATA is required. 5944 */ 5945 if ((length > offset) && 5946 (stcb != NULL) && 5947 (stcb->asoc.auth_supported == 1) && 5948 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5949 !stcb->asoc.authenticated) { 5950 /* "silently" ignore */ 5951 SCTP_STAT_INCR(sctps_recvauthmissing); 5952 SCTPDBG(SCTP_DEBUG_AUTH1, 5953 "Data chunk requires AUTH, skipped\n"); 5954 goto trigger_send; 5955 } 5956 if (length > offset) { 5957 int retval; 5958 5959 /* 5960 * First check to make sure our state is correct. We would 5961 * not get here unless we really did have a tag, so we don't 5962 * abort if this happens, just dump the chunk silently. 5963 */ 5964 switch (SCTP_GET_STATE(&stcb->asoc)) { 5965 case SCTP_STATE_COOKIE_ECHOED: 5966 /* 5967 * we consider data with valid tags in this state 5968 * shows us the cookie-ack was lost. Imply it was 5969 * there. 5970 */ 5971 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5972 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5973 stcb->asoc.overall_error_count, 5974 0, 5975 SCTP_FROM_SCTP_INPUT, 5976 __LINE__); 5977 } 5978 stcb->asoc.overall_error_count = 0; 5979 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5980 break; 5981 case SCTP_STATE_COOKIE_WAIT: 5982 /* 5983 * We consider OOTB any data sent during asoc setup. 5984 */ 5985 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5986 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5987 msg); 5988 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5989 mflowtype, mflowid, inp->fibnum, 5990 vrf_id, port); 5991 goto out; 5992 /* sa_ignore NOTREACHED */ 5993 break; 5994 case SCTP_STATE_EMPTY: /* should not happen */ 5995 case SCTP_STATE_INUSE: /* should not happen */ 5996 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5997 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5998 default: 5999 goto out; 6000 /* sa_ignore NOTREACHED */ 6001 break; 6002 case SCTP_STATE_OPEN: 6003 case SCTP_STATE_SHUTDOWN_SENT: 6004 break; 6005 } 6006 /* plow through the data chunks while length > offset */ 6007 retval = sctp_process_data(mm, iphlen, &offset, length, 6008 inp, stcb, net, &high_tsn); 6009 if (retval == 2) { 6010 /* 6011 * The association aborted, NO UNLOCK needed since 6012 * the association is destroyed. 6013 */ 6014 stcb = NULL; 6015 goto out; 6016 } 6017 data_processed = 1; 6018 /* 6019 * Anything important needs to have been m_copy'ed in 6020 * process_data 6021 */ 6022 } 6023 /* take care of ecn */ 6024 if ((data_processed == 1) && 6025 (stcb->asoc.ecn_supported == 1) && 6026 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6027 /* Yep, we need to add a ECNE */ 6028 sctp_send_ecn_echo(stcb, net, high_tsn); 6029 } 6030 if ((data_processed == 0) && (fwd_tsn_seen)) { 6031 int was_a_gap; 6032 uint32_t highest_tsn; 6033 6034 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6035 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6036 } else { 6037 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6038 } 6039 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6040 stcb->asoc.send_sack = 1; 6041 sctp_sack_check(stcb, was_a_gap); 6042 } else if (fwd_tsn_seen) { 6043 stcb->asoc.send_sack = 1; 6044 } 6045 /* trigger send of any chunks in queue... */ 6046 trigger_send: 6047 #ifdef SCTP_AUDITING_ENABLED 6048 sctp_audit_log(0xE0, 2); 6049 sctp_auditing(1, inp, stcb, net); 6050 #endif 6051 SCTPDBG(SCTP_DEBUG_INPUT1, 6052 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6053 stcb->asoc.peers_rwnd, 6054 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6055 stcb->asoc.total_flight); 6056 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6057 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6058 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6059 } 6060 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 6061 cnt_ctrl_ready || 6062 stcb->asoc.trigger_reset || 6063 ((un_sent) && 6064 (stcb->asoc.peers_rwnd > 0 || 6065 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6066 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6067 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6068 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6069 } 6070 #ifdef SCTP_AUDITING_ENABLED 6071 sctp_audit_log(0xE0, 3); 6072 sctp_auditing(2, inp, stcb, net); 6073 #endif 6074 out: 6075 if (stcb != NULL) { 6076 SCTP_TCB_UNLOCK(stcb); 6077 } 6078 if (inp_decr != NULL) { 6079 /* reduce ref-count */ 6080 SCTP_INP_WLOCK(inp_decr); 6081 SCTP_INP_DECR_REF(inp_decr); 6082 SCTP_INP_WUNLOCK(inp_decr); 6083 } 6084 return; 6085 } 6086 6087 #ifdef INET 6088 void 6089 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6090 { 6091 struct mbuf *m; 6092 int iphlen; 6093 uint32_t vrf_id = 0; 6094 uint8_t ecn_bits; 6095 struct sockaddr_in src, dst; 6096 struct ip *ip; 6097 struct sctphdr *sh; 6098 struct sctp_chunkhdr *ch; 6099 int length, offset; 6100 6101 #if !defined(SCTP_WITH_NO_CSUM) 6102 uint8_t compute_crc; 6103 6104 #endif 6105 uint32_t mflowid; 6106 uint8_t mflowtype; 6107 uint16_t fibnum; 6108 6109 iphlen = off; 6110 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6111 SCTP_RELEASE_PKT(i_pak); 6112 return; 6113 } 6114 m = SCTP_HEADER_TO_CHAIN(i_pak); 6115 #ifdef SCTP_MBUF_LOGGING 6116 /* Log in any input mbufs */ 6117 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6118 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6119 } 6120 #endif 6121 #ifdef SCTP_PACKET_LOGGING 6122 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6123 sctp_packet_log(m); 6124 } 6125 #endif 6126 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6127 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6128 m->m_pkthdr.len, 6129 if_name(m->m_pkthdr.rcvif), 6130 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6131 mflowid = m->m_pkthdr.flowid; 6132 mflowtype = M_HASHTYPE_GET(m); 6133 fibnum = M_GETFIB(m); 6134 SCTP_STAT_INCR(sctps_recvpackets); 6135 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6136 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6137 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6138 if (SCTP_BUF_LEN(m) < offset) { 6139 if ((m = m_pullup(m, offset)) == NULL) { 6140 SCTP_STAT_INCR(sctps_hdrops); 6141 return; 6142 } 6143 } 6144 ip = mtod(m, struct ip *); 6145 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6146 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6147 offset -= sizeof(struct sctp_chunkhdr); 6148 memset(&src, 0, sizeof(struct sockaddr_in)); 6149 src.sin_family = AF_INET; 6150 src.sin_len = sizeof(struct sockaddr_in); 6151 src.sin_port = sh->src_port; 6152 src.sin_addr = ip->ip_src; 6153 memset(&dst, 0, sizeof(struct sockaddr_in)); 6154 dst.sin_family = AF_INET; 6155 dst.sin_len = sizeof(struct sockaddr_in); 6156 dst.sin_port = sh->dest_port; 6157 dst.sin_addr = ip->ip_dst; 6158 length = ntohs(ip->ip_len); 6159 /* Validate mbuf chain length with IP payload length. */ 6160 if (SCTP_HEADER_LEN(m) != length) { 6161 SCTPDBG(SCTP_DEBUG_INPUT1, 6162 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6163 SCTP_STAT_INCR(sctps_hdrops); 6164 goto out; 6165 } 6166 /* SCTP does not allow broadcasts or multicasts */ 6167 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6168 goto out; 6169 } 6170 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6171 goto out; 6172 } 6173 ecn_bits = ip->ip_tos; 6174 #if defined(SCTP_WITH_NO_CSUM) 6175 SCTP_STAT_INCR(sctps_recvnocrc); 6176 #else 6177 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6178 SCTP_STAT_INCR(sctps_recvhwcrc); 6179 compute_crc = 0; 6180 } else { 6181 SCTP_STAT_INCR(sctps_recvswcrc); 6182 compute_crc = 1; 6183 } 6184 #endif 6185 sctp_common_input_processing(&m, iphlen, offset, length, 6186 (struct sockaddr *)&src, 6187 (struct sockaddr *)&dst, 6188 sh, ch, 6189 #if !defined(SCTP_WITH_NO_CSUM) 6190 compute_crc, 6191 #endif 6192 ecn_bits, 6193 mflowtype, mflowid, fibnum, 6194 vrf_id, port); 6195 out: 6196 if (m) { 6197 sctp_m_freem(m); 6198 } 6199 return; 6200 } 6201 6202 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6203 extern int *sctp_cpuarry; 6204 6205 #endif 6206 6207 int 6208 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6209 { 6210 struct mbuf *m; 6211 int off; 6212 6213 m = *mp; 6214 off = *offp; 6215 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6216 if (mp_ncpus > 1) { 6217 struct ip *ip; 6218 struct sctphdr *sh; 6219 int offset; 6220 int cpu_to_use; 6221 uint32_t flowid, tag; 6222 6223 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6224 flowid = m->m_pkthdr.flowid; 6225 } else { 6226 /* 6227 * No flow id built by lower layers fix it so we 6228 * create one. 6229 */ 6230 offset = off + sizeof(struct sctphdr); 6231 if (SCTP_BUF_LEN(m) < offset) { 6232 if ((m = m_pullup(m, offset)) == NULL) { 6233 SCTP_STAT_INCR(sctps_hdrops); 6234 return (IPPROTO_DONE); 6235 } 6236 } 6237 ip = mtod(m, struct ip *); 6238 sh = (struct sctphdr *)((caddr_t)ip + off); 6239 tag = htonl(sh->v_tag); 6240 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6241 m->m_pkthdr.flowid = flowid; 6242 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6243 } 6244 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6245 sctp_queue_to_mcore(m, off, cpu_to_use); 6246 return (IPPROTO_DONE); 6247 } 6248 #endif 6249 sctp_input_with_port(m, off, 0); 6250 return (IPPROTO_DONE); 6251 } 6252 6253 #endif 6254