1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91 { 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207 outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211 } 212 213 /* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217 int 218 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221 #endif 222 ) 223 { 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280 } 281 282 static int 283 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284 { 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322 #ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325 #endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427 } 428 429 /* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432 static int 433 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t mflowtype, uint32_t mflowid, 438 uint32_t vrf_id) 439 { 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 mflowtype, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->asconf_supported == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 mflowtype, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559 } 560 561 static void 562 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564 { 565 union sctp_sockstore store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficent if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 old_error_counter = r_net->error_count; 640 r_net->error_count = 0; 641 r_net->hb_responded = 1; 642 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 643 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 644 /* Now lets do a RTO with this */ 645 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 646 SCTP_RTT_FROM_NON_DATA); 647 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 648 r_net->dest_state |= SCTP_ADDR_REACHABLE; 649 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 650 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 651 } 652 if (r_net->dest_state & SCTP_ADDR_PF) { 653 r_net->dest_state &= ~SCTP_ADDR_PF; 654 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 655 } 656 if (old_error_counter > 0) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691 } 692 693 static int 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695 { 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 703 /* generate a new vtag and send init */ 704 LIST_REMOVE(stcb, sctp_asocs); 705 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 706 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 707 /* 708 * put it in the bucket in the vtag hash of assoc's for the 709 * system 710 */ 711 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 712 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 713 return (1); 714 } 715 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 716 /* 717 * treat like a case where the cookie expired i.e.: - dump 718 * current cookie. - generate a new vtag. - resend init. 719 */ 720 /* generate a new vtag and send init */ 721 LIST_REMOVE(stcb, sctp_asocs); 722 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 723 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 724 sctp_stop_all_cookie_timers(stcb); 725 sctp_toss_old_cookies(stcb, &stcb->asoc); 726 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 727 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 728 /* 729 * put it in the bucket in the vtag hash of assoc's for the 730 * system 731 */ 732 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 733 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 734 return (1); 735 } 736 return (0); 737 } 738 739 static int 740 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 741 struct sctp_nets *net) 742 { 743 /* 744 * return 0 means we want you to proceed with the abort non-zero 745 * means no abort processing 746 */ 747 if (stcb->asoc.auth_supported == 0) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 749 return (0); 750 } 751 sctp_asconf_send_nat_state_update(stcb, net); 752 return (1); 753 } 754 755 756 static void 757 sctp_handle_abort(struct sctp_abort_chunk *abort, 758 struct sctp_tcb *stcb, struct sctp_nets *net) 759 { 760 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 761 struct socket *so; 762 763 #endif 764 uint16_t len; 765 uint16_t error; 766 767 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 768 if (stcb == NULL) 769 return; 770 771 len = ntohs(abort->ch.chunk_length); 772 if (len > sizeof(struct sctp_chunkhdr)) { 773 /* 774 * Need to check the cause codes for our two magic nat 775 * aborts which don't kill the assoc necessarily. 776 */ 777 struct sctp_missing_nat_state *natc; 778 779 natc = (struct sctp_missing_nat_state *)(abort + 1); 780 error = ntohs(natc->cause); 781 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 782 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 783 abort->ch.chunk_flags); 784 if (sctp_handle_nat_colliding_state(stcb)) { 785 return; 786 } 787 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 788 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 789 abort->ch.chunk_flags); 790 if (sctp_handle_nat_missing_state(stcb, net)) { 791 return; 792 } 793 } 794 } else { 795 error = 0; 796 } 797 /* stop any receive timers */ 798 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 799 /* notify user of the abort and clean up... */ 800 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 801 /* free the tcb */ 802 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 803 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 804 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 806 } 807 #ifdef SCTP_ASOCLOG_OF_TSNS 808 sctp_print_out_track_log(stcb); 809 #endif 810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 811 so = SCTP_INP_SO(stcb->sctp_ep); 812 atomic_add_int(&stcb->asoc.refcnt, 1); 813 SCTP_TCB_UNLOCK(stcb); 814 SCTP_SOCKET_LOCK(so, 1); 815 SCTP_TCB_LOCK(stcb); 816 atomic_subtract_int(&stcb->asoc.refcnt, 1); 817 #endif 818 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 819 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 821 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 SCTP_SOCKET_UNLOCK(so, 1); 823 #endif 824 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 825 } 826 827 static void 828 sctp_start_net_timers(struct sctp_tcb *stcb) 829 { 830 uint32_t cnt_hb_sent; 831 struct sctp_nets *net; 832 833 cnt_hb_sent = 0; 834 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 835 /* 836 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 837 * If the dest in unconfirmed send a hb as well if under 838 * max_hb_burst have been sent. 839 */ 840 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 841 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 842 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 843 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 844 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 845 cnt_hb_sent++; 846 } 847 } 848 if (cnt_hb_sent) { 849 sctp_chunk_output(stcb->sctp_ep, stcb, 850 SCTP_OUTPUT_FROM_COOKIE_ACK, 851 SCTP_SO_NOT_LOCKED); 852 } 853 } 854 855 856 static void 857 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 858 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 859 { 860 struct sctp_association *asoc; 861 int some_on_streamwheel; 862 863 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866 #endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } else { 881 sctp_update_acked(stcb, cp, abort_flag); 882 if (*abort_flag) { 883 return; 884 } 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 asoc->control_pdapi->end_added = 1; 892 asoc->control_pdapi->pdapi_aborted = 1; 893 asoc->control_pdapi = NULL; 894 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 so = SCTP_INP_SO(stcb->sctp_ep); 897 atomic_add_int(&stcb->asoc.refcnt, 1); 898 SCTP_TCB_UNLOCK(stcb); 899 SCTP_SOCKET_LOCK(so, 1); 900 SCTP_TCB_LOCK(stcb); 901 atomic_subtract_int(&stcb->asoc.refcnt, 1); 902 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 903 /* assoc was freed while we were unlocked */ 904 SCTP_SOCKET_UNLOCK(so, 1); 905 return; 906 } 907 #endif 908 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 909 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 910 SCTP_SOCKET_UNLOCK(so, 1); 911 #endif 912 } 913 /* goto SHUTDOWN_RECEIVED state to block new requests */ 914 if (stcb->sctp_socket) { 915 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 916 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 917 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 918 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 919 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 920 /* 921 * notify upper layer that peer has initiated a 922 * shutdown 923 */ 924 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 925 926 /* reset time */ 927 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 928 } 929 } 930 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 931 /* 932 * stop the shutdown timer, since we WILL move to 933 * SHUTDOWN-ACK-SENT. 934 */ 935 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 936 } 937 /* Now is there unsent data on a stream somewhere? */ 938 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 939 940 if (!TAILQ_EMPTY(&asoc->send_queue) || 941 !TAILQ_EMPTY(&asoc->sent_queue) || 942 some_on_streamwheel) { 943 /* By returning we will push more data out */ 944 return; 945 } else { 946 /* no outstanding data to send, so move on... */ 947 /* send SHUTDOWN-ACK */ 948 /* move to SHUTDOWN-ACK-SENT state */ 949 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 950 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 951 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 952 } 953 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 954 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 955 sctp_stop_timers_for_shutdown(stcb); 956 sctp_send_shutdown_ack(stcb, net); 957 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 958 stcb, net); 959 } 960 } 961 962 static void 963 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 964 struct sctp_tcb *stcb, 965 struct sctp_nets *net) 966 { 967 struct sctp_association *asoc; 968 969 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 970 struct socket *so; 971 972 so = SCTP_INP_SO(stcb->sctp_ep); 973 #endif 974 SCTPDBG(SCTP_DEBUG_INPUT2, 975 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 976 if (stcb == NULL) 977 return; 978 979 asoc = &stcb->asoc; 980 /* process according to association state */ 981 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 982 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 983 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 984 sctp_send_shutdown_complete(stcb, net, 1); 985 SCTP_TCB_UNLOCK(stcb); 986 return; 987 } 988 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 989 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 990 /* unexpected SHUTDOWN-ACK... so ignore... */ 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if (asoc->control_pdapi) { 995 /* 996 * With a normal shutdown we assume the end of last record. 997 */ 998 SCTP_INP_READ_LOCK(stcb->sctp_ep); 999 asoc->control_pdapi->end_added = 1; 1000 asoc->control_pdapi->pdapi_aborted = 1; 1001 asoc->control_pdapi = NULL; 1002 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1003 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1004 atomic_add_int(&stcb->asoc.refcnt, 1); 1005 SCTP_TCB_UNLOCK(stcb); 1006 SCTP_SOCKET_LOCK(so, 1); 1007 SCTP_TCB_LOCK(stcb); 1008 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1009 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1010 /* assoc was freed while we were unlocked */ 1011 SCTP_SOCKET_UNLOCK(so, 1); 1012 return; 1013 } 1014 #endif 1015 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1016 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018 #endif 1019 } 1020 #ifdef INVARIANTS 1021 if (!TAILQ_EMPTY(&asoc->send_queue) || 1022 !TAILQ_EMPTY(&asoc->sent_queue) || 1023 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1024 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1025 } 1026 #endif 1027 /* stop the timer */ 1028 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1029 /* send SHUTDOWN-COMPLETE */ 1030 sctp_send_shutdown_complete(stcb, net, 0); 1031 /* notify upper layer protocol */ 1032 if (stcb->sctp_socket) { 1033 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1034 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1035 stcb->sctp_socket->so_snd.sb_cc = 0; 1036 } 1037 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1038 } 1039 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1040 /* free the TCB but first save off the ep */ 1041 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1042 atomic_add_int(&stcb->asoc.refcnt, 1); 1043 SCTP_TCB_UNLOCK(stcb); 1044 SCTP_SOCKET_LOCK(so, 1); 1045 SCTP_TCB_LOCK(stcb); 1046 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1047 #endif 1048 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1049 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1050 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1051 SCTP_SOCKET_UNLOCK(so, 1); 1052 #endif 1053 } 1054 1055 /* 1056 * Skip past the param header and then we will find the chunk that caused the 1057 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1058 * our peer must be broken. 1059 */ 1060 static void 1061 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1062 struct sctp_nets *net) 1063 { 1064 struct sctp_chunkhdr *chk; 1065 1066 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1067 switch (chk->chunk_type) { 1068 case SCTP_ASCONF_ACK: 1069 case SCTP_ASCONF: 1070 sctp_asconf_cleanup(stcb, net); 1071 break; 1072 case SCTP_FORWARD_CUM_TSN: 1073 stcb->asoc.prsctp_supported = 0; 1074 break; 1075 default: 1076 SCTPDBG(SCTP_DEBUG_INPUT2, 1077 "Peer does not support chunk type %d(%x)??\n", 1078 chk->chunk_type, (uint32_t) chk->chunk_type); 1079 break; 1080 } 1081 } 1082 1083 /* 1084 * Skip past the param header and then we will find the param that caused the 1085 * problem. There are a number of param's in a ASCONF OR the prsctp param 1086 * these will turn of specific features. 1087 * XXX: Is this the right thing to do? 1088 */ 1089 static void 1090 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1091 { 1092 struct sctp_paramhdr *pbad; 1093 1094 pbad = phdr + 1; 1095 switch (ntohs(pbad->param_type)) { 1096 /* pr-sctp draft */ 1097 case SCTP_PRSCTP_SUPPORTED: 1098 stcb->asoc.prsctp_supported = 0; 1099 break; 1100 case SCTP_SUPPORTED_CHUNK_EXT: 1101 break; 1102 /* draft-ietf-tsvwg-addip-sctp */ 1103 case SCTP_HAS_NAT_SUPPORT: 1104 stcb->asoc.peer_supports_nat = 0; 1105 break; 1106 case SCTP_ADD_IP_ADDRESS: 1107 case SCTP_DEL_IP_ADDRESS: 1108 case SCTP_SET_PRIM_ADDR: 1109 stcb->asoc.asconf_supported = 0; 1110 break; 1111 case SCTP_SUCCESS_REPORT: 1112 case SCTP_ERROR_CAUSE_IND: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1114 SCTPDBG(SCTP_DEBUG_INPUT2, 1115 "Turning off ASCONF to this strange peer\n"); 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 default: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, 1120 "Peer does not support param type %d(%x)??\n", 1121 pbad->param_type, (uint32_t) pbad->param_type); 1122 break; 1123 } 1124 } 1125 1126 static int 1127 sctp_handle_error(struct sctp_chunkhdr *ch, 1128 struct sctp_tcb *stcb, struct sctp_nets *net) 1129 { 1130 int chklen; 1131 struct sctp_paramhdr *phdr; 1132 uint16_t error, error_type; 1133 uint16_t error_len; 1134 struct sctp_association *asoc; 1135 int adjust; 1136 1137 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1138 struct socket *so; 1139 1140 #endif 1141 1142 /* parse through all of the errors and process */ 1143 asoc = &stcb->asoc; 1144 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1145 sizeof(struct sctp_chunkhdr)); 1146 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1147 error = 0; 1148 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1149 /* Process an Error Cause */ 1150 error_type = ntohs(phdr->param_type); 1151 error_len = ntohs(phdr->param_length); 1152 if ((error_len > chklen) || (error_len == 0)) { 1153 /* invalid param length for this param */ 1154 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1155 chklen, error_len); 1156 return (0); 1157 } 1158 if (error == 0) { 1159 /* report the first error cause */ 1160 error = error_type; 1161 } 1162 switch (error_type) { 1163 case SCTP_CAUSE_INVALID_STREAM: 1164 case SCTP_CAUSE_MISSING_PARAM: 1165 case SCTP_CAUSE_INVALID_PARAM: 1166 case SCTP_CAUSE_NO_USER_DATA: 1167 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1168 error_type); 1169 break; 1170 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1171 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1172 ch->chunk_flags); 1173 if (sctp_handle_nat_colliding_state(stcb)) { 1174 return (0); 1175 } 1176 break; 1177 case SCTP_CAUSE_NAT_MISSING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_missing_state(stcb, net)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_STALE_COOKIE: 1185 /* 1186 * We only act if we have echoed a cookie and are 1187 * waiting. 1188 */ 1189 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1190 int *p; 1191 1192 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1193 /* Save the time doubled */ 1194 asoc->cookie_preserve_req = ntohl(*p) << 1; 1195 asoc->stale_cookie_count++; 1196 if (asoc->stale_cookie_count > 1197 asoc->max_init_times) { 1198 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1199 /* now free the asoc */ 1200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1201 so = SCTP_INP_SO(stcb->sctp_ep); 1202 atomic_add_int(&stcb->asoc.refcnt, 1); 1203 SCTP_TCB_UNLOCK(stcb); 1204 SCTP_SOCKET_LOCK(so, 1); 1205 SCTP_TCB_LOCK(stcb); 1206 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1207 #endif 1208 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1209 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1210 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 SCTP_SOCKET_UNLOCK(so, 1); 1212 #endif 1213 return (-1); 1214 } 1215 /* blast back to INIT state */ 1216 sctp_toss_old_cookies(stcb, &stcb->asoc); 1217 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1218 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1219 sctp_stop_all_cookie_timers(stcb); 1220 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1221 } 1222 break; 1223 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1224 /* 1225 * Nothing we can do here, we don't do hostname 1226 * addresses so if the peer does not like my IPv6 1227 * (or IPv4 for that matter) it does not matter. If 1228 * they don't support that type of address, they can 1229 * NOT possibly get that packet type... i.e. with no 1230 * IPv6 you can't recieve a IPv6 packet. so we can 1231 * safely ignore this one. If we ever added support 1232 * for HOSTNAME Addresses, then we would need to do 1233 * something here. 1234 */ 1235 break; 1236 case SCTP_CAUSE_UNRECOG_CHUNK: 1237 sctp_process_unrecog_chunk(stcb, phdr, net); 1238 break; 1239 case SCTP_CAUSE_UNRECOG_PARAM: 1240 sctp_process_unrecog_param(stcb, phdr); 1241 break; 1242 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1243 /* 1244 * We ignore this since the timer will drive out a 1245 * new cookie anyway and there timer will drive us 1246 * to send a SHUTDOWN_COMPLETE. We can't send one 1247 * here since we don't have their tag. 1248 */ 1249 break; 1250 case SCTP_CAUSE_DELETING_LAST_ADDR: 1251 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1252 case SCTP_CAUSE_DELETING_SRC_ADDR: 1253 /* 1254 * We should NOT get these here, but in a 1255 * ASCONF-ACK. 1256 */ 1257 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1258 error_type); 1259 break; 1260 case SCTP_CAUSE_OUT_OF_RESC: 1261 /* 1262 * And what, pray tell do we do with the fact that 1263 * the peer is out of resources? Not really sure we 1264 * could do anything but abort. I suspect this 1265 * should have came WITH an abort instead of in a 1266 * OP-ERROR. 1267 */ 1268 break; 1269 default: 1270 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1271 error_type); 1272 break; 1273 } 1274 adjust = SCTP_SIZE32(error_len); 1275 chklen -= adjust; 1276 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1277 } 1278 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1279 return (0); 1280 } 1281 1282 static int 1283 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1284 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1285 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1286 struct sctp_nets *net, int *abort_no_unlock, 1287 uint8_t mflowtype, uint32_t mflowid, 1288 uint32_t vrf_id) 1289 { 1290 struct sctp_init_ack *init_ack; 1291 struct mbuf *op_err; 1292 1293 SCTPDBG(SCTP_DEBUG_INPUT2, 1294 "sctp_handle_init_ack: handling INIT-ACK\n"); 1295 1296 if (stcb == NULL) { 1297 SCTPDBG(SCTP_DEBUG_INPUT2, 1298 "sctp_handle_init_ack: TCB is null\n"); 1299 return (-1); 1300 } 1301 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1302 /* Invalid length */ 1303 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1304 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1305 src, dst, sh, op_err, 1306 mflowtype, mflowid, 1307 vrf_id, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 init_ack = &cp->init; 1312 /* validate parameters */ 1313 if (init_ack->initiate_tag == 0) { 1314 /* protocol error... send an abort */ 1315 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1316 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1317 src, dst, sh, op_err, 1318 mflowtype, mflowid, 1319 vrf_id, net->port); 1320 *abort_no_unlock = 1; 1321 return (-1); 1322 } 1323 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1324 /* protocol error... send an abort */ 1325 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1326 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1327 src, dst, sh, op_err, 1328 mflowtype, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (init_ack->num_inbound_streams == 0) { 1334 /* protocol error... send an abort */ 1335 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1336 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1337 src, dst, sh, op_err, 1338 mflowtype, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_outbound_streams == 0) { 1344 /* protocol error... send an abort */ 1345 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1346 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1347 src, dst, sh, op_err, 1348 mflowtype, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 /* process according to association state... */ 1354 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1355 case SCTP_STATE_COOKIE_WAIT: 1356 /* this is the expected state for this chunk */ 1357 /* process the INIT-ACK parameters */ 1358 if (stcb->asoc.primary_destination->dest_state & 1359 SCTP_ADDR_UNCONFIRMED) { 1360 /* 1361 * The primary is where we sent the INIT, we can 1362 * always consider it confirmed when the INIT-ACK is 1363 * returned. Do this before we load addresses 1364 * though. 1365 */ 1366 stcb->asoc.primary_destination->dest_state &= 1367 ~SCTP_ADDR_UNCONFIRMED; 1368 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1369 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1370 } 1371 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1372 net, abort_no_unlock, 1373 mflowtype, mflowid, 1374 vrf_id) < 0) { 1375 /* error in parsing parameters */ 1376 return (-1); 1377 } 1378 /* update our state */ 1379 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1380 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1381 1382 /* reset the RTO calc */ 1383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1384 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1385 stcb->asoc.overall_error_count, 1386 0, 1387 SCTP_FROM_SCTP_INPUT, 1388 __LINE__); 1389 } 1390 stcb->asoc.overall_error_count = 0; 1391 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1392 /* 1393 * collapse the init timer back in case of a exponential 1394 * backoff 1395 */ 1396 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1397 stcb, net); 1398 /* 1399 * the send at the end of the inbound data processing will 1400 * cause the cookie to be sent 1401 */ 1402 break; 1403 case SCTP_STATE_SHUTDOWN_SENT: 1404 /* incorrect state... discard */ 1405 break; 1406 case SCTP_STATE_COOKIE_ECHOED: 1407 /* incorrect state... discard */ 1408 break; 1409 case SCTP_STATE_OPEN: 1410 /* incorrect state... discard */ 1411 break; 1412 case SCTP_STATE_EMPTY: 1413 case SCTP_STATE_INUSE: 1414 default: 1415 /* incorrect state... discard */ 1416 return (-1); 1417 break; 1418 } 1419 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1420 return (0); 1421 } 1422 1423 static struct sctp_tcb * 1424 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1425 struct sockaddr *src, struct sockaddr *dst, 1426 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1427 struct sctp_inpcb *inp, struct sctp_nets **netp, 1428 struct sockaddr *init_src, int *notification, 1429 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1430 uint8_t mflowtype, uint32_t mflowid, 1431 uint32_t vrf_id, uint16_t port); 1432 1433 1434 /* 1435 * handle a state cookie for an existing association m: input packet mbuf 1436 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1437 * "split" mbuf and the cookie signature does not exist offset: offset into 1438 * mbuf to the cookie-echo chunk 1439 */ 1440 static struct sctp_tcb * 1441 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1442 struct sockaddr *src, struct sockaddr *dst, 1443 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1444 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1445 struct sockaddr *init_src, int *notification, 1446 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1447 uint8_t mflowtype, uint32_t mflowid, 1448 uint32_t vrf_id, uint16_t port) 1449 { 1450 struct sctp_association *asoc; 1451 struct sctp_init_chunk *init_cp, init_buf; 1452 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1453 struct sctp_nets *net; 1454 struct mbuf *op_err; 1455 int init_offset, initack_offset, i; 1456 int retval; 1457 int spec_flag = 0; 1458 uint32_t how_indx; 1459 1460 #if defined(SCTP_DETAILED_STR_STATS) 1461 int j; 1462 1463 #endif 1464 1465 net = *netp; 1466 /* I know that the TCB is non-NULL from the caller */ 1467 asoc = &stcb->asoc; 1468 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1469 if (asoc->cookie_how[how_indx] == 0) 1470 break; 1471 } 1472 if (how_indx < sizeof(asoc->cookie_how)) { 1473 asoc->cookie_how[how_indx] = 1; 1474 } 1475 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1476 /* SHUTDOWN came in after sending INIT-ACK */ 1477 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1479 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1480 mflowtype, mflowid, 1481 vrf_id, net->port); 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 2; 1484 return (NULL); 1485 } 1486 /* 1487 * find and validate the INIT chunk in the cookie (peer's info) the 1488 * INIT should start after the cookie-echo header struct (chunk 1489 * header, state cookie header struct) 1490 */ 1491 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1492 1493 init_cp = (struct sctp_init_chunk *) 1494 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1495 (uint8_t *) & init_buf); 1496 if (init_cp == NULL) { 1497 /* could not pull a INIT chunk in cookie */ 1498 return (NULL); 1499 } 1500 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1501 return (NULL); 1502 } 1503 /* 1504 * find and validate the INIT-ACK chunk in the cookie (my info) the 1505 * INIT-ACK follows the INIT chunk 1506 */ 1507 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1508 initack_cp = (struct sctp_init_ack_chunk *) 1509 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1510 (uint8_t *) & initack_buf); 1511 if (initack_cp == NULL) { 1512 /* could not pull INIT-ACK chunk in cookie */ 1513 return (NULL); 1514 } 1515 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1516 return (NULL); 1517 } 1518 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1519 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1520 /* 1521 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1522 * to get into the OPEN state 1523 */ 1524 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1525 /*- 1526 * Opps, this means that we somehow generated two vtag's 1527 * the same. I.e. we did: 1528 * Us Peer 1529 * <---INIT(tag=a)------ 1530 * ----INIT-ACK(tag=t)--> 1531 * ----INIT(tag=t)------> *1 1532 * <---INIT-ACK(tag=a)--- 1533 * <----CE(tag=t)------------- *2 1534 * 1535 * At point *1 we should be generating a different 1536 * tag t'. Which means we would throw away the CE and send 1537 * ours instead. Basically this is case C (throw away side). 1538 */ 1539 if (how_indx < sizeof(asoc->cookie_how)) 1540 asoc->cookie_how[how_indx] = 17; 1541 return (NULL); 1542 1543 } 1544 switch (SCTP_GET_STATE(asoc)) { 1545 case SCTP_STATE_COOKIE_WAIT: 1546 case SCTP_STATE_COOKIE_ECHOED: 1547 /* 1548 * INIT was sent but got a COOKIE_ECHO with the 1549 * correct tags... just accept it...but we must 1550 * process the init so that we can make sure we have 1551 * the right seq no's. 1552 */ 1553 /* First we must process the INIT !! */ 1554 retval = sctp_process_init(init_cp, stcb); 1555 if (retval < 0) { 1556 if (how_indx < sizeof(asoc->cookie_how)) 1557 asoc->cookie_how[how_indx] = 3; 1558 return (NULL); 1559 } 1560 /* we have already processed the INIT so no problem */ 1561 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1562 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1563 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1564 /* update current state */ 1565 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1566 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1567 else 1568 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1569 1570 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1571 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1572 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1573 stcb->sctp_ep, stcb, asoc->primary_destination); 1574 } 1575 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1576 sctp_stop_all_cookie_timers(stcb); 1577 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1578 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1579 (inp->sctp_socket->so_qlimit == 0) 1580 ) { 1581 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1582 struct socket *so; 1583 1584 #endif 1585 /* 1586 * Here is where collision would go if we 1587 * did a connect() and instead got a 1588 * init/init-ack/cookie done before the 1589 * init-ack came back.. 1590 */ 1591 stcb->sctp_ep->sctp_flags |= 1592 SCTP_PCB_FLAGS_CONNECTED; 1593 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1594 so = SCTP_INP_SO(stcb->sctp_ep); 1595 atomic_add_int(&stcb->asoc.refcnt, 1); 1596 SCTP_TCB_UNLOCK(stcb); 1597 SCTP_SOCKET_LOCK(so, 1); 1598 SCTP_TCB_LOCK(stcb); 1599 atomic_add_int(&stcb->asoc.refcnt, -1); 1600 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1601 SCTP_SOCKET_UNLOCK(so, 1); 1602 return (NULL); 1603 } 1604 #endif 1605 soisconnected(stcb->sctp_socket); 1606 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 SCTP_SOCKET_UNLOCK(so, 1); 1608 #endif 1609 } 1610 /* notify upper layer */ 1611 *notification = SCTP_NOTIFY_ASSOC_UP; 1612 /* 1613 * since we did not send a HB make sure we don't 1614 * double things 1615 */ 1616 net->hb_responded = 1; 1617 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1618 &cookie->time_entered, 1619 sctp_align_unsafe_makecopy, 1620 SCTP_RTT_FROM_NON_DATA); 1621 1622 if (stcb->asoc.sctp_autoclose_ticks && 1623 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1624 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1625 inp, stcb, NULL); 1626 } 1627 break; 1628 default: 1629 /* 1630 * we're in the OPEN state (or beyond), so peer must 1631 * have simply lost the COOKIE-ACK 1632 */ 1633 break; 1634 } /* end switch */ 1635 sctp_stop_all_cookie_timers(stcb); 1636 /* 1637 * We ignore the return code here.. not sure if we should 1638 * somehow abort.. but we do have an existing asoc. This 1639 * really should not fail. 1640 */ 1641 if (sctp_load_addresses_from_init(stcb, m, 1642 init_offset + sizeof(struct sctp_init_chunk), 1643 initack_offset, src, dst, init_src)) { 1644 if (how_indx < sizeof(asoc->cookie_how)) 1645 asoc->cookie_how[how_indx] = 4; 1646 return (NULL); 1647 } 1648 /* respond with a COOKIE-ACK */ 1649 sctp_toss_old_cookies(stcb, asoc); 1650 sctp_send_cookie_ack(stcb); 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 5; 1653 return (stcb); 1654 } 1655 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1656 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1657 cookie->tie_tag_my_vtag == 0 && 1658 cookie->tie_tag_peer_vtag == 0) { 1659 /* 1660 * case C in Section 5.2.4 Table 2: XMOO silently discard 1661 */ 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 6; 1664 return (NULL); 1665 } 1666 /* 1667 * If nat support, and the below and stcb is established, send back 1668 * a ABORT(colliding state) if we are established. 1669 */ 1670 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1671 (asoc->peer_supports_nat) && 1672 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1673 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1674 (asoc->peer_vtag == 0)))) { 1675 /* 1676 * Special case - Peer's support nat. We may have two init's 1677 * that we gave out the same tag on since one was not 1678 * established.. i.e. we get INIT from host-1 behind the nat 1679 * and we respond tag-a, we get a INIT from host-2 behind 1680 * the nat and we get tag-a again. Then we bring up host-1 1681 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1682 * Now we have colliding state. We must send an abort here 1683 * with colliding state indication. 1684 */ 1685 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1686 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1687 mflowtype, mflowid, 1688 vrf_id, port); 1689 return (NULL); 1690 } 1691 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1692 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1693 (asoc->peer_vtag == 0))) { 1694 /* 1695 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1696 * should be ok, re-accept peer info 1697 */ 1698 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1699 /* 1700 * Extension of case C. If we hit this, then the 1701 * random number generator returned the same vtag 1702 * when we first sent our INIT-ACK and when we later 1703 * sent our INIT. The side with the seq numbers that 1704 * are different will be the one that normnally 1705 * would have hit case C. This in effect "extends" 1706 * our vtags in this collision case to be 64 bits. 1707 * The same collision could occur aka you get both 1708 * vtag and seq number the same twice in a row.. but 1709 * is much less likely. If it did happen then we 1710 * would proceed through and bring up the assoc.. we 1711 * may end up with the wrong stream setup however.. 1712 * which would be bad.. but there is no way to 1713 * tell.. until we send on a stream that does not 1714 * exist :-) 1715 */ 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 7; 1718 1719 return (NULL); 1720 } 1721 if (how_indx < sizeof(asoc->cookie_how)) 1722 asoc->cookie_how[how_indx] = 8; 1723 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1724 sctp_stop_all_cookie_timers(stcb); 1725 /* 1726 * since we did not send a HB make sure we don't double 1727 * things 1728 */ 1729 net->hb_responded = 1; 1730 if (stcb->asoc.sctp_autoclose_ticks && 1731 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1732 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1733 NULL); 1734 } 1735 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1736 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1737 1738 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1739 /* 1740 * Ok the peer probably discarded our data (if we 1741 * echoed a cookie+data). So anything on the 1742 * sent_queue should be marked for retransmit, we 1743 * may not get something to kick us so it COULD 1744 * still take a timeout to move these.. but it can't 1745 * hurt to mark them. 1746 */ 1747 struct sctp_tmit_chunk *chk; 1748 1749 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1750 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1751 chk->sent = SCTP_DATAGRAM_RESEND; 1752 sctp_flight_size_decrease(chk); 1753 sctp_total_flight_decrease(stcb, chk); 1754 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1755 spec_flag++; 1756 } 1757 } 1758 1759 } 1760 /* process the INIT info (peer's info) */ 1761 retval = sctp_process_init(init_cp, stcb); 1762 if (retval < 0) { 1763 if (how_indx < sizeof(asoc->cookie_how)) 1764 asoc->cookie_how[how_indx] = 9; 1765 return (NULL); 1766 } 1767 if (sctp_load_addresses_from_init(stcb, m, 1768 init_offset + sizeof(struct sctp_init_chunk), 1769 initack_offset, src, dst, init_src)) { 1770 if (how_indx < sizeof(asoc->cookie_how)) 1771 asoc->cookie_how[how_indx] = 10; 1772 return (NULL); 1773 } 1774 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1775 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1776 *notification = SCTP_NOTIFY_ASSOC_UP; 1777 1778 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1779 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1780 (inp->sctp_socket->so_qlimit == 0)) { 1781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1782 struct socket *so; 1783 1784 #endif 1785 stcb->sctp_ep->sctp_flags |= 1786 SCTP_PCB_FLAGS_CONNECTED; 1787 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 so = SCTP_INP_SO(stcb->sctp_ep); 1789 atomic_add_int(&stcb->asoc.refcnt, 1); 1790 SCTP_TCB_UNLOCK(stcb); 1791 SCTP_SOCKET_LOCK(so, 1); 1792 SCTP_TCB_LOCK(stcb); 1793 atomic_add_int(&stcb->asoc.refcnt, -1); 1794 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1795 SCTP_SOCKET_UNLOCK(so, 1); 1796 return (NULL); 1797 } 1798 #endif 1799 soisconnected(stcb->sctp_socket); 1800 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1801 SCTP_SOCKET_UNLOCK(so, 1); 1802 #endif 1803 } 1804 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1806 else 1807 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1808 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1809 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1810 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1811 } else { 1812 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1813 } 1814 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1815 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1816 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1817 stcb->sctp_ep, stcb, asoc->primary_destination); 1818 } 1819 sctp_stop_all_cookie_timers(stcb); 1820 sctp_toss_old_cookies(stcb, asoc); 1821 sctp_send_cookie_ack(stcb); 1822 if (spec_flag) { 1823 /* 1824 * only if we have retrans set do we do this. What 1825 * this call does is get only the COOKIE-ACK out and 1826 * then when we return the normal call to 1827 * sctp_chunk_output will get the retrans out behind 1828 * this. 1829 */ 1830 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1831 } 1832 if (how_indx < sizeof(asoc->cookie_how)) 1833 asoc->cookie_how[how_indx] = 11; 1834 1835 return (stcb); 1836 } 1837 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1838 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1839 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1840 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1841 cookie->tie_tag_peer_vtag != 0) { 1842 struct sctpasochead *head; 1843 1844 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1845 struct socket *so; 1846 1847 #endif 1848 1849 if (asoc->peer_supports_nat) { 1850 /* 1851 * This is a gross gross hack. Just call the 1852 * cookie_new code since we are allowing a duplicate 1853 * association. I hope this works... 1854 */ 1855 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1856 sh, cookie, cookie_len, 1857 inp, netp, init_src, notification, 1858 auth_skipped, auth_offset, auth_len, 1859 mflowtype, mflowid, 1860 vrf_id, port)); 1861 } 1862 /* 1863 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1864 */ 1865 /* temp code */ 1866 if (how_indx < sizeof(asoc->cookie_how)) 1867 asoc->cookie_how[how_indx] = 12; 1868 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1869 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1870 1871 /* notify upper layer */ 1872 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1873 atomic_add_int(&stcb->asoc.refcnt, 1); 1874 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1875 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1876 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1877 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1878 } 1879 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1881 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1882 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1883 } 1884 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1885 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, asoc->primary_destination); 1888 1889 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1890 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1891 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1892 } 1893 asoc->pre_open_streams = 1894 ntohs(initack_cp->init.num_outbound_streams); 1895 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1896 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1897 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1898 1899 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1900 1901 asoc->str_reset_seq_in = asoc->init_seq_number; 1902 1903 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1904 if (asoc->mapping_array) { 1905 memset(asoc->mapping_array, 0, 1906 asoc->mapping_array_size); 1907 } 1908 if (asoc->nr_mapping_array) { 1909 memset(asoc->nr_mapping_array, 0, 1910 asoc->mapping_array_size); 1911 } 1912 SCTP_TCB_UNLOCK(stcb); 1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 so = SCTP_INP_SO(stcb->sctp_ep); 1915 SCTP_SOCKET_LOCK(so, 1); 1916 #endif 1917 SCTP_INP_INFO_WLOCK(); 1918 SCTP_INP_WLOCK(stcb->sctp_ep); 1919 SCTP_TCB_LOCK(stcb); 1920 atomic_add_int(&stcb->asoc.refcnt, -1); 1921 /* send up all the data */ 1922 SCTP_TCB_SEND_LOCK(stcb); 1923 1924 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1925 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1926 stcb->asoc.strmout[i].chunks_on_queues = 0; 1927 #if defined(SCTP_DETAILED_STR_STATS) 1928 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1929 asoc->strmout[i].abandoned_sent[j] = 0; 1930 asoc->strmout[i].abandoned_unsent[j] = 0; 1931 } 1932 #else 1933 asoc->strmout[i].abandoned_sent[0] = 0; 1934 asoc->strmout[i].abandoned_unsent[0] = 0; 1935 #endif 1936 stcb->asoc.strmout[i].stream_no = i; 1937 stcb->asoc.strmout[i].next_sequence_send = 0; 1938 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1939 } 1940 /* process the INIT-ACK info (my info) */ 1941 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1942 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1943 1944 /* pull from vtag hash */ 1945 LIST_REMOVE(stcb, sctp_asocs); 1946 /* re-insert to new vtag position */ 1947 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1948 SCTP_BASE_INFO(hashasocmark))]; 1949 /* 1950 * put it in the bucket in the vtag hash of assoc's for the 1951 * system 1952 */ 1953 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1954 1955 SCTP_TCB_SEND_UNLOCK(stcb); 1956 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1957 SCTP_INP_INFO_WUNLOCK(); 1958 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1959 SCTP_SOCKET_UNLOCK(so, 1); 1960 #endif 1961 asoc->total_flight = 0; 1962 asoc->total_flight_count = 0; 1963 /* process the INIT info (peer's info) */ 1964 retval = sctp_process_init(init_cp, stcb); 1965 if (retval < 0) { 1966 if (how_indx < sizeof(asoc->cookie_how)) 1967 asoc->cookie_how[how_indx] = 13; 1968 1969 return (NULL); 1970 } 1971 /* 1972 * since we did not send a HB make sure we don't double 1973 * things 1974 */ 1975 net->hb_responded = 1; 1976 1977 if (sctp_load_addresses_from_init(stcb, m, 1978 init_offset + sizeof(struct sctp_init_chunk), 1979 initack_offset, src, dst, init_src)) { 1980 if (how_indx < sizeof(asoc->cookie_how)) 1981 asoc->cookie_how[how_indx] = 14; 1982 1983 return (NULL); 1984 } 1985 /* respond with a COOKIE-ACK */ 1986 sctp_stop_all_cookie_timers(stcb); 1987 sctp_toss_old_cookies(stcb, asoc); 1988 sctp_send_cookie_ack(stcb); 1989 if (how_indx < sizeof(asoc->cookie_how)) 1990 asoc->cookie_how[how_indx] = 15; 1991 1992 return (stcb); 1993 } 1994 if (how_indx < sizeof(asoc->cookie_how)) 1995 asoc->cookie_how[how_indx] = 16; 1996 /* all other cases... */ 1997 return (NULL); 1998 } 1999 2000 2001 /* 2002 * handle a state cookie for a new association m: input packet mbuf chain-- 2003 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2004 * and the cookie signature does not exist offset: offset into mbuf to the 2005 * cookie-echo chunk length: length of the cookie chunk to: where the init 2006 * was from returns a new TCB 2007 */ 2008 static struct sctp_tcb * 2009 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2010 struct sockaddr *src, struct sockaddr *dst, 2011 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2012 struct sctp_inpcb *inp, struct sctp_nets **netp, 2013 struct sockaddr *init_src, int *notification, 2014 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2015 uint8_t mflowtype, uint32_t mflowid, 2016 uint32_t vrf_id, uint16_t port) 2017 { 2018 struct sctp_tcb *stcb; 2019 struct sctp_init_chunk *init_cp, init_buf; 2020 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2021 union sctp_sockstore store; 2022 struct sctp_association *asoc; 2023 int init_offset, initack_offset, initack_limit; 2024 int retval; 2025 int error = 0; 2026 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2027 2028 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2029 struct socket *so; 2030 2031 so = SCTP_INP_SO(inp); 2032 #endif 2033 2034 /* 2035 * find and validate the INIT chunk in the cookie (peer's info) the 2036 * INIT should start after the cookie-echo header struct (chunk 2037 * header, state cookie header struct) 2038 */ 2039 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2040 init_cp = (struct sctp_init_chunk *) 2041 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2042 (uint8_t *) & init_buf); 2043 if (init_cp == NULL) { 2044 /* could not pull a INIT chunk in cookie */ 2045 SCTPDBG(SCTP_DEBUG_INPUT1, 2046 "process_cookie_new: could not pull INIT chunk hdr\n"); 2047 return (NULL); 2048 } 2049 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2050 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2051 return (NULL); 2052 } 2053 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2054 /* 2055 * find and validate the INIT-ACK chunk in the cookie (my info) the 2056 * INIT-ACK follows the INIT chunk 2057 */ 2058 initack_cp = (struct sctp_init_ack_chunk *) 2059 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2060 (uint8_t *) & initack_buf); 2061 if (initack_cp == NULL) { 2062 /* could not pull INIT-ACK chunk in cookie */ 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2064 return (NULL); 2065 } 2066 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2067 return (NULL); 2068 } 2069 /* 2070 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2071 * "initack_limit" value. This is because the chk_length field 2072 * includes the length of the cookie, but the cookie is omitted when 2073 * the INIT and INIT_ACK are tacked onto the cookie... 2074 */ 2075 initack_limit = offset + cookie_len; 2076 2077 /* 2078 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2079 * and popluate 2080 */ 2081 2082 /* 2083 * Here we do a trick, we set in NULL for the proc/thread argument. 2084 * We do this since in effect we only use the p argument when the 2085 * socket is unbound and we must do an implicit bind. Since we are 2086 * getting a cookie, we cannot be unbound. 2087 */ 2088 stcb = sctp_aloc_assoc(inp, init_src, &error, 2089 ntohl(initack_cp->init.initiate_tag), vrf_id, 2090 (struct thread *)NULL 2091 ); 2092 if (stcb == NULL) { 2093 struct mbuf *op_err; 2094 2095 /* memory problem? */ 2096 SCTPDBG(SCTP_DEBUG_INPUT1, 2097 "process_cookie_new: no room for another TCB!\n"); 2098 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2099 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2100 src, dst, sh, op_err, 2101 mflowtype, mflowid, 2102 vrf_id, port); 2103 return (NULL); 2104 } 2105 /* get the correct sctp_nets */ 2106 if (netp) 2107 *netp = sctp_findnet(stcb, init_src); 2108 2109 asoc = &stcb->asoc; 2110 /* get scope variables out of cookie */ 2111 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2112 asoc->scope.site_scope = cookie->site_scope; 2113 asoc->scope.local_scope = cookie->local_scope; 2114 asoc->scope.loopback_scope = cookie->loopback_scope; 2115 2116 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2117 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2118 struct mbuf *op_err; 2119 2120 /* 2121 * Houston we have a problem. The EP changed while the 2122 * cookie was in flight. Only recourse is to abort the 2123 * association. 2124 */ 2125 atomic_add_int(&stcb->asoc.refcnt, 1); 2126 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2127 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2128 src, dst, sh, op_err, 2129 mflowtype, mflowid, 2130 vrf_id, port); 2131 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135 #endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2138 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2139 SCTP_SOCKET_UNLOCK(so, 1); 2140 #endif 2141 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2142 return (NULL); 2143 } 2144 /* process the INIT-ACK info (my info) */ 2145 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2146 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2147 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2148 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2149 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2150 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2151 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2152 asoc->str_reset_seq_in = asoc->init_seq_number; 2153 2154 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2155 2156 /* process the INIT info (peer's info) */ 2157 if (netp) 2158 retval = sctp_process_init(init_cp, stcb); 2159 else 2160 retval = 0; 2161 if (retval < 0) { 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2164 SCTP_TCB_UNLOCK(stcb); 2165 SCTP_SOCKET_LOCK(so, 1); 2166 SCTP_TCB_LOCK(stcb); 2167 #endif 2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2169 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_SOCKET_UNLOCK(so, 1); 2171 #endif 2172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2173 return (NULL); 2174 } 2175 /* load all addresses */ 2176 if (sctp_load_addresses_from_init(stcb, m, 2177 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2178 src, dst, init_src)) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184 #endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2186 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188 #endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 /* 2193 * verify any preceding AUTH chunk that was skipped 2194 */ 2195 /* pull the local authentication parameters from the cookie/init-ack */ 2196 sctp_auth_get_cookie_params(stcb, m, 2197 initack_offset + sizeof(struct sctp_init_ack_chunk), 2198 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2199 if (auth_skipped) { 2200 struct sctp_auth_chunk *auth; 2201 2202 auth = (struct sctp_auth_chunk *) 2203 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2204 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2205 /* auth HMAC failed, dump the assoc and packet */ 2206 SCTPDBG(SCTP_DEBUG_AUTH1, 2207 "COOKIE-ECHO: AUTH failed\n"); 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_TCB_UNLOCK(stcb); 2211 SCTP_SOCKET_LOCK(so, 1); 2212 SCTP_TCB_LOCK(stcb); 2213 #endif 2214 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2215 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2216 SCTP_SOCKET_UNLOCK(so, 1); 2217 #endif 2218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2219 return (NULL); 2220 } else { 2221 /* remaining chunks checked... good to go */ 2222 stcb->asoc.authenticated = 1; 2223 } 2224 } 2225 /* update current state */ 2226 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2227 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2228 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2229 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2230 stcb->sctp_ep, stcb, asoc->primary_destination); 2231 } 2232 sctp_stop_all_cookie_timers(stcb); 2233 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2234 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2235 2236 /* 2237 * if we're doing ASCONFs, check to see if we have any new local 2238 * addresses that need to get added to the peer (eg. addresses 2239 * changed while cookie echo in flight). This needs to be done 2240 * after we go to the OPEN state to do the correct asconf 2241 * processing. else, make sure we have the correct addresses in our 2242 * lists 2243 */ 2244 2245 /* warning, we re-use sin, sin6, sa_store here! */ 2246 /* pull in local_address (our "from" address) */ 2247 switch (cookie->laddr_type) { 2248 #ifdef INET 2249 case SCTP_IPV4_ADDRESS: 2250 /* source addr is IPv4 */ 2251 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2252 store.sin.sin_family = AF_INET; 2253 store.sin.sin_len = sizeof(struct sockaddr_in); 2254 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2255 break; 2256 #endif 2257 #ifdef INET6 2258 case SCTP_IPV6_ADDRESS: 2259 /* source addr is IPv6 */ 2260 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2261 store.sin6.sin6_family = AF_INET6; 2262 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2263 store.sin6.sin6_scope_id = cookie->scope_id; 2264 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2265 break; 2266 #endif 2267 default: 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2270 SCTP_TCB_UNLOCK(stcb); 2271 SCTP_SOCKET_LOCK(so, 1); 2272 SCTP_TCB_LOCK(stcb); 2273 #endif 2274 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2275 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2276 SCTP_SOCKET_UNLOCK(so, 1); 2277 #endif 2278 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2279 return (NULL); 2280 } 2281 2282 /* set up to notify upper layer */ 2283 *notification = SCTP_NOTIFY_ASSOC_UP; 2284 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2285 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2286 (inp->sctp_socket->so_qlimit == 0)) { 2287 /* 2288 * This is an endpoint that called connect() how it got a 2289 * cookie that is NEW is a bit of a mystery. It must be that 2290 * the INIT was sent, but before it got there.. a complete 2291 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2292 * should have went to the other code.. not here.. oh well.. 2293 * a bit of protection is worth having.. 2294 */ 2295 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2296 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 atomic_add_int(&stcb->asoc.refcnt, 1); 2298 SCTP_TCB_UNLOCK(stcb); 2299 SCTP_SOCKET_LOCK(so, 1); 2300 SCTP_TCB_LOCK(stcb); 2301 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2302 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2303 SCTP_SOCKET_UNLOCK(so, 1); 2304 return (NULL); 2305 } 2306 #endif 2307 soisconnected(stcb->sctp_socket); 2308 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2309 SCTP_SOCKET_UNLOCK(so, 1); 2310 #endif 2311 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2312 (inp->sctp_socket->so_qlimit)) { 2313 /* 2314 * We don't want to do anything with this one. Since it is 2315 * the listening guy. The timer will get started for 2316 * accepted connections in the caller. 2317 */ 2318 ; 2319 } 2320 /* since we did not send a HB make sure we don't double things */ 2321 if ((netp) && (*netp)) 2322 (*netp)->hb_responded = 1; 2323 2324 if (stcb->asoc.sctp_autoclose_ticks && 2325 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2326 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2327 } 2328 /* calculate the RTT */ 2329 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2330 if ((netp) && (*netp)) { 2331 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2332 &cookie->time_entered, sctp_align_unsafe_makecopy, 2333 SCTP_RTT_FROM_NON_DATA); 2334 } 2335 /* respond with a COOKIE-ACK */ 2336 sctp_send_cookie_ack(stcb); 2337 2338 /* 2339 * check the address lists for any ASCONFs that need to be sent 2340 * AFTER the cookie-ack is sent 2341 */ 2342 sctp_check_address_list(stcb, m, 2343 initack_offset + sizeof(struct sctp_init_ack_chunk), 2344 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2345 &store.sa, cookie->local_scope, cookie->site_scope, 2346 cookie->ipv4_scope, cookie->loopback_scope); 2347 2348 2349 return (stcb); 2350 } 2351 2352 /* 2353 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2354 * we NEED to make sure we are not already using the vtag. If so we 2355 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2356 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2357 SCTP_BASE_INFO(hashasocmark))]; 2358 LIST_FOREACH(stcb, head, sctp_asocs) { 2359 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2360 -- SEND ABORT - TRY AGAIN -- 2361 } 2362 } 2363 */ 2364 2365 /* 2366 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2367 * existing (non-NULL) TCB 2368 */ 2369 static struct mbuf * 2370 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2371 struct sockaddr *src, struct sockaddr *dst, 2372 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2373 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2374 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2375 struct sctp_tcb **locked_tcb, 2376 uint8_t mflowtype, uint32_t mflowid, 2377 uint32_t vrf_id, uint16_t port) 2378 { 2379 struct sctp_state_cookie *cookie; 2380 struct sctp_tcb *l_stcb = *stcb; 2381 struct sctp_inpcb *l_inp; 2382 struct sockaddr *to; 2383 struct sctp_pcb *ep; 2384 struct mbuf *m_sig; 2385 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2386 uint8_t *sig; 2387 uint8_t cookie_ok = 0; 2388 unsigned int sig_offset, cookie_offset; 2389 unsigned int cookie_len; 2390 struct timeval now; 2391 struct timeval time_expires; 2392 int notification = 0; 2393 struct sctp_nets *netl; 2394 int had_a_existing_tcb = 0; 2395 int send_int_conf = 0; 2396 2397 #ifdef INET 2398 struct sockaddr_in sin; 2399 2400 #endif 2401 #ifdef INET6 2402 struct sockaddr_in6 sin6; 2403 2404 #endif 2405 2406 SCTPDBG(SCTP_DEBUG_INPUT2, 2407 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2408 2409 if (inp_p == NULL) { 2410 return (NULL); 2411 } 2412 cookie = &cp->cookie; 2413 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2414 cookie_len = ntohs(cp->ch.chunk_length); 2415 2416 if ((cookie->peerport != sh->src_port) && 2417 (cookie->myport != sh->dest_port) && 2418 (cookie->my_vtag != sh->v_tag)) { 2419 /* 2420 * invalid ports or bad tag. Note that we always leave the 2421 * v_tag in the header in network order and when we stored 2422 * it in the my_vtag slot we also left it in network order. 2423 * This maintains the match even though it may be in the 2424 * opposite byte order of the machine :-> 2425 */ 2426 return (NULL); 2427 } 2428 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2429 sizeof(struct sctp_init_chunk) + 2430 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2431 /* cookie too small */ 2432 return (NULL); 2433 } 2434 /* 2435 * split off the signature into its own mbuf (since it should not be 2436 * calculated in the sctp_hmac_m() call). 2437 */ 2438 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2439 m_sig = m_split(m, sig_offset, M_NOWAIT); 2440 if (m_sig == NULL) { 2441 /* out of memory or ?? */ 2442 return (NULL); 2443 } 2444 #ifdef SCTP_MBUF_LOGGING 2445 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2446 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2447 } 2448 #endif 2449 2450 /* 2451 * compute the signature/digest for the cookie 2452 */ 2453 ep = &(*inp_p)->sctp_ep; 2454 l_inp = *inp_p; 2455 if (l_stcb) { 2456 SCTP_TCB_UNLOCK(l_stcb); 2457 } 2458 SCTP_INP_RLOCK(l_inp); 2459 if (l_stcb) { 2460 SCTP_TCB_LOCK(l_stcb); 2461 } 2462 /* which cookie is it? */ 2463 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2464 (ep->current_secret_number != ep->last_secret_number)) { 2465 /* it's the old cookie */ 2466 (void)sctp_hmac_m(SCTP_HMAC, 2467 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2468 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2469 } else { 2470 /* it's the current cookie */ 2471 (void)sctp_hmac_m(SCTP_HMAC, 2472 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2473 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2474 } 2475 /* get the signature */ 2476 SCTP_INP_RUNLOCK(l_inp); 2477 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2478 if (sig == NULL) { 2479 /* couldn't find signature */ 2480 sctp_m_freem(m_sig); 2481 return (NULL); 2482 } 2483 /* compare the received digest with the computed digest */ 2484 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2485 /* try the old cookie? */ 2486 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2487 (ep->current_secret_number != ep->last_secret_number)) { 2488 /* compute digest with old */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 /* compare */ 2493 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2494 cookie_ok = 1; 2495 } 2496 } else { 2497 cookie_ok = 1; 2498 } 2499 2500 /* 2501 * Now before we continue we must reconstruct our mbuf so that 2502 * normal processing of any other chunks will work. 2503 */ 2504 { 2505 struct mbuf *m_at; 2506 2507 m_at = m; 2508 while (SCTP_BUF_NEXT(m_at) != NULL) { 2509 m_at = SCTP_BUF_NEXT(m_at); 2510 } 2511 SCTP_BUF_NEXT(m_at) = m_sig; 2512 } 2513 2514 if (cookie_ok == 0) { 2515 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2516 SCTPDBG(SCTP_DEBUG_INPUT2, 2517 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2518 (uint32_t) offset, cookie_offset, sig_offset); 2519 return (NULL); 2520 } 2521 /* 2522 * check the cookie timestamps to be sure it's not stale 2523 */ 2524 (void)SCTP_GETTIME_TIMEVAL(&now); 2525 /* Expire time is in Ticks, so we convert to seconds */ 2526 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2527 time_expires.tv_usec = cookie->time_entered.tv_usec; 2528 /* 2529 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2530 * is undefined. 2531 */ 2532 if (timevalcmp(&now, &time_expires, >)) { 2533 /* cookie is stale! */ 2534 struct mbuf *op_err; 2535 struct sctp_stale_cookie_msg *scm; 2536 uint32_t tim; 2537 2538 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2539 0, M_NOWAIT, 1, MT_DATA); 2540 if (op_err == NULL) { 2541 /* FOOBAR */ 2542 return (NULL); 2543 } 2544 /* Set the len */ 2545 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2546 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2547 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2548 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2549 (sizeof(uint32_t)))); 2550 /* seconds to usec */ 2551 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2552 /* add in usec */ 2553 if (tim == 0) 2554 tim = now.tv_usec - cookie->time_entered.tv_usec; 2555 scm->time_usec = htonl(tim); 2556 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2557 mflowtype, mflowid, 2558 vrf_id, port); 2559 return (NULL); 2560 } 2561 /* 2562 * Now we must see with the lookup address if we have an existing 2563 * asoc. This will only happen if we were in the COOKIE-WAIT state 2564 * and a INIT collided with us and somewhere the peer sent the 2565 * cookie on another address besides the single address our assoc 2566 * had for him. In this case we will have one of the tie-tags set at 2567 * least AND the address field in the cookie can be used to look it 2568 * up. 2569 */ 2570 to = NULL; 2571 switch (cookie->addr_type) { 2572 #ifdef INET6 2573 case SCTP_IPV6_ADDRESS: 2574 memset(&sin6, 0, sizeof(sin6)); 2575 sin6.sin6_family = AF_INET6; 2576 sin6.sin6_len = sizeof(sin6); 2577 sin6.sin6_port = sh->src_port; 2578 sin6.sin6_scope_id = cookie->scope_id; 2579 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2580 sizeof(sin6.sin6_addr.s6_addr)); 2581 to = (struct sockaddr *)&sin6; 2582 break; 2583 #endif 2584 #ifdef INET 2585 case SCTP_IPV4_ADDRESS: 2586 memset(&sin, 0, sizeof(sin)); 2587 sin.sin_family = AF_INET; 2588 sin.sin_len = sizeof(sin); 2589 sin.sin_port = sh->src_port; 2590 sin.sin_addr.s_addr = cookie->address[0]; 2591 to = (struct sockaddr *)&sin; 2592 break; 2593 #endif 2594 default: 2595 /* This should not happen */ 2596 return (NULL); 2597 } 2598 if (*stcb == NULL) { 2599 /* Yep, lets check */ 2600 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2601 if (*stcb == NULL) { 2602 /* 2603 * We should have only got back the same inp. If we 2604 * got back a different ep we have a problem. The 2605 * original findep got back l_inp and now 2606 */ 2607 if (l_inp != *inp_p) { 2608 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2609 } 2610 } else { 2611 if (*locked_tcb == NULL) { 2612 /* 2613 * In this case we found the assoc only 2614 * after we locked the create lock. This 2615 * means we are in a colliding case and we 2616 * must make sure that we unlock the tcb if 2617 * its one of the cases where we throw away 2618 * the incoming packets. 2619 */ 2620 *locked_tcb = *stcb; 2621 2622 /* 2623 * We must also increment the inp ref count 2624 * since the ref_count flags was set when we 2625 * did not find the TCB, now we found it 2626 * which reduces the refcount.. we must 2627 * raise it back out to balance it all :-) 2628 */ 2629 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2630 if ((*stcb)->sctp_ep != l_inp) { 2631 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2632 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2633 } 2634 } 2635 } 2636 } 2637 cookie_len -= SCTP_SIGNATURE_SIZE; 2638 if (*stcb == NULL) { 2639 /* this is the "normal" case... get a new TCB */ 2640 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2641 cookie, cookie_len, *inp_p, 2642 netp, to, ¬ification, 2643 auth_skipped, auth_offset, auth_len, 2644 mflowtype, mflowid, 2645 vrf_id, port); 2646 } else { 2647 /* this is abnormal... cookie-echo on existing TCB */ 2648 had_a_existing_tcb = 1; 2649 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2650 src, dst, sh, 2651 cookie, cookie_len, *inp_p, *stcb, netp, to, 2652 ¬ification, auth_skipped, auth_offset, auth_len, 2653 mflowtype, mflowid, 2654 vrf_id, port); 2655 } 2656 2657 if (*stcb == NULL) { 2658 /* still no TCB... must be bad cookie-echo */ 2659 return (NULL); 2660 } 2661 if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 2662 (*netp)->flowtype = mflowtype; 2663 } 2664 /* 2665 * Ok, we built an association so confirm the address we sent the 2666 * INIT-ACK to. 2667 */ 2668 netl = sctp_findnet(*stcb, to); 2669 /* 2670 * This code should in theory NOT run but 2671 */ 2672 if (netl == NULL) { 2673 /* TSNH! Huh, why do I need to add this address here? */ 2674 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2675 return (NULL); 2676 } 2677 netl = sctp_findnet(*stcb, to); 2678 } 2679 if (netl) { 2680 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2681 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2682 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2683 netl); 2684 send_int_conf = 1; 2685 } 2686 } 2687 sctp_start_net_timers(*stcb); 2688 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2689 if (!had_a_existing_tcb || 2690 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2691 /* 2692 * If we have a NEW cookie or the connect never 2693 * reached the connected state during collision we 2694 * must do the TCP accept thing. 2695 */ 2696 struct socket *so, *oso; 2697 struct sctp_inpcb *inp; 2698 2699 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2700 /* 2701 * For a restart we will keep the same 2702 * socket, no need to do anything. I THINK!! 2703 */ 2704 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2705 if (send_int_conf) { 2706 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2707 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2708 } 2709 return (m); 2710 } 2711 oso = (*inp_p)->sctp_socket; 2712 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2713 SCTP_TCB_UNLOCK((*stcb)); 2714 CURVNET_SET(oso->so_vnet); 2715 so = sonewconn(oso, 0 2716 ); 2717 CURVNET_RESTORE(); 2718 SCTP_TCB_LOCK((*stcb)); 2719 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2720 2721 if (so == NULL) { 2722 struct mbuf *op_err; 2723 2724 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2725 struct socket *pcb_so; 2726 2727 #endif 2728 /* Too many sockets */ 2729 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2730 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2731 sctp_abort_association(*inp_p, NULL, m, iphlen, 2732 src, dst, sh, op_err, 2733 mflowtype, mflowid, 2734 vrf_id, port); 2735 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2736 pcb_so = SCTP_INP_SO(*inp_p); 2737 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2738 SCTP_TCB_UNLOCK((*stcb)); 2739 SCTP_SOCKET_LOCK(pcb_so, 1); 2740 SCTP_TCB_LOCK((*stcb)); 2741 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2742 #endif 2743 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2744 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2745 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2746 #endif 2747 return (NULL); 2748 } 2749 inp = (struct sctp_inpcb *)so->so_pcb; 2750 SCTP_INP_INCR_REF(inp); 2751 /* 2752 * We add the unbound flag here so that if we get an 2753 * soabort() before we get the move_pcb done, we 2754 * will properly cleanup. 2755 */ 2756 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2757 SCTP_PCB_FLAGS_CONNECTED | 2758 SCTP_PCB_FLAGS_IN_TCPPOOL | 2759 SCTP_PCB_FLAGS_UNBOUND | 2760 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2761 SCTP_PCB_FLAGS_DONT_WAKE); 2762 inp->sctp_features = (*inp_p)->sctp_features; 2763 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2764 inp->sctp_socket = so; 2765 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2766 inp->max_cwnd = (*inp_p)->max_cwnd; 2767 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2768 inp->ecn_supported = (*inp_p)->ecn_supported; 2769 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2770 inp->auth_supported = (*inp_p)->auth_supported; 2771 inp->asconf_supported = (*inp_p)->asconf_supported; 2772 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2773 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2774 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2775 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2776 inp->sctp_context = (*inp_p)->sctp_context; 2777 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2778 inp->inp_starting_point_for_iterator = NULL; 2779 /* 2780 * copy in the authentication parameters from the 2781 * original endpoint 2782 */ 2783 if (inp->sctp_ep.local_hmacs) 2784 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2785 inp->sctp_ep.local_hmacs = 2786 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2787 if (inp->sctp_ep.local_auth_chunks) 2788 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2789 inp->sctp_ep.local_auth_chunks = 2790 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2791 2792 /* 2793 * Now we must move it from one hash table to 2794 * another and get the tcb in the right place. 2795 */ 2796 2797 /* 2798 * This is where the one-2-one socket is put into 2799 * the accept state waiting for the accept! 2800 */ 2801 if (*stcb) { 2802 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2803 } 2804 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2805 2806 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2807 SCTP_TCB_UNLOCK((*stcb)); 2808 2809 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2810 0); 2811 SCTP_TCB_LOCK((*stcb)); 2812 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2813 2814 2815 /* 2816 * now we must check to see if we were aborted while 2817 * the move was going on and the lock/unlock 2818 * happened. 2819 */ 2820 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2821 /* 2822 * yep it was, we leave the assoc attached 2823 * to the socket since the sctp_inpcb_free() 2824 * call will send an abort for us. 2825 */ 2826 SCTP_INP_DECR_REF(inp); 2827 return (NULL); 2828 } 2829 SCTP_INP_DECR_REF(inp); 2830 /* Switch over to the new guy */ 2831 *inp_p = inp; 2832 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2833 if (send_int_conf) { 2834 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2835 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2836 } 2837 /* 2838 * Pull it from the incomplete queue and wake the 2839 * guy 2840 */ 2841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2842 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2843 SCTP_TCB_UNLOCK((*stcb)); 2844 SCTP_SOCKET_LOCK(so, 1); 2845 #endif 2846 soisconnected(so); 2847 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2848 SCTP_TCB_LOCK((*stcb)); 2849 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2850 SCTP_SOCKET_UNLOCK(so, 1); 2851 #endif 2852 return (m); 2853 } 2854 } 2855 if (notification) { 2856 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2857 } 2858 if (send_int_conf) { 2859 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2860 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2861 } 2862 return (m); 2863 } 2864 2865 static void 2866 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2867 struct sctp_tcb *stcb, struct sctp_nets *net) 2868 { 2869 /* cp must not be used, others call this without a c-ack :-) */ 2870 struct sctp_association *asoc; 2871 2872 SCTPDBG(SCTP_DEBUG_INPUT2, 2873 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2874 if ((stcb == NULL) || (net == NULL)) { 2875 return; 2876 } 2877 asoc = &stcb->asoc; 2878 2879 sctp_stop_all_cookie_timers(stcb); 2880 /* process according to association state */ 2881 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2882 /* state change only needed when I am in right state */ 2883 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2884 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2885 sctp_start_net_timers(stcb); 2886 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2887 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2888 stcb->sctp_ep, stcb, asoc->primary_destination); 2889 2890 } 2891 /* update RTO */ 2892 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2893 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2894 if (asoc->overall_error_count == 0) { 2895 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2896 &asoc->time_entered, sctp_align_safe_nocopy, 2897 SCTP_RTT_FROM_NON_DATA); 2898 } 2899 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2900 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2901 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2902 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2904 struct socket *so; 2905 2906 #endif 2907 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2908 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2909 so = SCTP_INP_SO(stcb->sctp_ep); 2910 atomic_add_int(&stcb->asoc.refcnt, 1); 2911 SCTP_TCB_UNLOCK(stcb); 2912 SCTP_SOCKET_LOCK(so, 1); 2913 SCTP_TCB_LOCK(stcb); 2914 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2915 #endif 2916 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2917 soisconnected(stcb->sctp_socket); 2918 } 2919 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2920 SCTP_SOCKET_UNLOCK(so, 1); 2921 #endif 2922 } 2923 /* 2924 * since we did not send a HB make sure we don't double 2925 * things 2926 */ 2927 net->hb_responded = 1; 2928 2929 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2930 /* 2931 * We don't need to do the asconf thing, nor hb or 2932 * autoclose if the socket is closed. 2933 */ 2934 goto closed_socket; 2935 } 2936 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2937 stcb, net); 2938 2939 2940 if (stcb->asoc.sctp_autoclose_ticks && 2941 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2942 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2943 stcb->sctp_ep, stcb, NULL); 2944 } 2945 /* 2946 * send ASCONF if parameters are pending and ASCONFs are 2947 * allowed (eg. addresses changed when init/cookie echo were 2948 * in flight) 2949 */ 2950 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2951 (stcb->asoc.asconf_supported == 1) && 2952 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2953 #ifdef SCTP_TIMER_BASED_ASCONF 2954 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2955 stcb->sctp_ep, stcb, 2956 stcb->asoc.primary_destination); 2957 #else 2958 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2959 SCTP_ADDR_NOT_LOCKED); 2960 #endif 2961 } 2962 } 2963 closed_socket: 2964 /* Toss the cookie if I can */ 2965 sctp_toss_old_cookies(stcb, asoc); 2966 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2967 /* Restart the timer if we have pending data */ 2968 struct sctp_tmit_chunk *chk; 2969 2970 chk = TAILQ_FIRST(&asoc->sent_queue); 2971 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2972 } 2973 } 2974 2975 static void 2976 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2977 struct sctp_tcb *stcb) 2978 { 2979 struct sctp_nets *net; 2980 struct sctp_tmit_chunk *lchk; 2981 struct sctp_ecne_chunk bkup; 2982 uint8_t override_bit; 2983 uint32_t tsn, window_data_tsn; 2984 int len; 2985 unsigned int pkt_cnt; 2986 2987 len = ntohs(cp->ch.chunk_length); 2988 if ((len != sizeof(struct sctp_ecne_chunk)) && 2989 (len != sizeof(struct old_sctp_ecne_chunk))) { 2990 return; 2991 } 2992 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2993 /* Its the old format */ 2994 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2995 bkup.num_pkts_since_cwr = htonl(1); 2996 cp = &bkup; 2997 } 2998 SCTP_STAT_INCR(sctps_recvecne); 2999 tsn = ntohl(cp->tsn); 3000 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3001 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3002 if (lchk == NULL) { 3003 window_data_tsn = stcb->asoc.sending_seq - 1; 3004 } else { 3005 window_data_tsn = lchk->rec.data.TSN_seq; 3006 } 3007 3008 /* Find where it was sent to if possible. */ 3009 net = NULL; 3010 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3011 if (lchk->rec.data.TSN_seq == tsn) { 3012 net = lchk->whoTo; 3013 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3014 break; 3015 } 3016 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3017 break; 3018 } 3019 } 3020 if (net == NULL) { 3021 /* 3022 * What to do. A previous send of a CWR was possibly lost. 3023 * See how old it is, we may have it marked on the actual 3024 * net. 3025 */ 3026 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3027 if (tsn == net->last_cwr_tsn) { 3028 /* Found him, send it off */ 3029 break; 3030 } 3031 } 3032 if (net == NULL) { 3033 /* 3034 * If we reach here, we need to send a special CWR 3035 * that says hey, we did this a long time ago and 3036 * you lost the response. 3037 */ 3038 net = TAILQ_FIRST(&stcb->asoc.nets); 3039 if (net == NULL) { 3040 /* TSNH */ 3041 return; 3042 } 3043 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3044 } else { 3045 override_bit = 0; 3046 } 3047 } else { 3048 override_bit = 0; 3049 } 3050 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3051 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3052 /* 3053 * JRS - Use the congestion control given in the pluggable 3054 * CC module 3055 */ 3056 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3057 /* 3058 * We reduce once every RTT. So we will only lower cwnd at 3059 * the next sending seq i.e. the window_data_tsn 3060 */ 3061 net->cwr_window_tsn = window_data_tsn; 3062 net->ecn_ce_pkt_cnt += pkt_cnt; 3063 net->lost_cnt = pkt_cnt; 3064 net->last_cwr_tsn = tsn; 3065 } else { 3066 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3067 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3068 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3069 /* 3070 * Another loss in the same window update how many 3071 * marks/packets lost we have had. 3072 */ 3073 int cnt = 1; 3074 3075 if (pkt_cnt > net->lost_cnt) { 3076 /* Should be the case */ 3077 cnt = (pkt_cnt - net->lost_cnt); 3078 net->ecn_ce_pkt_cnt += cnt; 3079 } 3080 net->lost_cnt = pkt_cnt; 3081 net->last_cwr_tsn = tsn; 3082 /* 3083 * Most CC functions will ignore this call, since we 3084 * are in-window yet of the initial CE the peer saw. 3085 */ 3086 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3087 } 3088 } 3089 /* 3090 * We always send a CWR this way if our previous one was lost our 3091 * peer will get an update, or if it is not time again to reduce we 3092 * still get the cwr to the peer. Note we set the override when we 3093 * could not find the TSN on the chunk or the destination network. 3094 */ 3095 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3096 } 3097 3098 static void 3099 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3100 { 3101 /* 3102 * Here we get a CWR from the peer. We must look in the outqueue and 3103 * make sure that we have a covered ECNE in the control chunk part. 3104 * If so remove it. 3105 */ 3106 struct sctp_tmit_chunk *chk; 3107 struct sctp_ecne_chunk *ecne; 3108 int override; 3109 uint32_t cwr_tsn; 3110 3111 cwr_tsn = ntohl(cp->tsn); 3112 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3113 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3114 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3115 continue; 3116 } 3117 if ((override == 0) && (chk->whoTo != net)) { 3118 /* Must be from the right src unless override is set */ 3119 continue; 3120 } 3121 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3122 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3123 /* this covers this ECNE, we can remove it */ 3124 stcb->asoc.ecn_echo_cnt_onq--; 3125 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3126 sctp_next); 3127 sctp_m_freem(chk->data); 3128 chk->data = NULL; 3129 stcb->asoc.ctrl_queue_cnt--; 3130 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3131 if (override == 0) { 3132 break; 3133 } 3134 } 3135 } 3136 } 3137 3138 static void 3139 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3140 struct sctp_tcb *stcb, struct sctp_nets *net) 3141 { 3142 struct sctp_association *asoc; 3143 3144 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3145 struct socket *so; 3146 3147 #endif 3148 3149 SCTPDBG(SCTP_DEBUG_INPUT2, 3150 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3151 if (stcb == NULL) 3152 return; 3153 3154 asoc = &stcb->asoc; 3155 /* process according to association state */ 3156 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3157 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3158 SCTPDBG(SCTP_DEBUG_INPUT2, 3159 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3160 SCTP_TCB_UNLOCK(stcb); 3161 return; 3162 } 3163 /* notify upper layer protocol */ 3164 if (stcb->sctp_socket) { 3165 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3166 } 3167 #ifdef INVARIANTS 3168 if (!TAILQ_EMPTY(&asoc->send_queue) || 3169 !TAILQ_EMPTY(&asoc->sent_queue) || 3170 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3171 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3172 } 3173 #endif 3174 /* stop the timer */ 3175 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3176 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3177 /* free the TCB */ 3178 SCTPDBG(SCTP_DEBUG_INPUT2, 3179 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3180 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3181 so = SCTP_INP_SO(stcb->sctp_ep); 3182 atomic_add_int(&stcb->asoc.refcnt, 1); 3183 SCTP_TCB_UNLOCK(stcb); 3184 SCTP_SOCKET_LOCK(so, 1); 3185 SCTP_TCB_LOCK(stcb); 3186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3187 #endif 3188 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3189 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3190 SCTP_SOCKET_UNLOCK(so, 1); 3191 #endif 3192 return; 3193 } 3194 3195 static int 3196 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3197 struct sctp_nets *net, uint8_t flg) 3198 { 3199 switch (desc->chunk_type) { 3200 case SCTP_DATA: 3201 /* find the tsn to resend (possibly */ 3202 { 3203 uint32_t tsn; 3204 struct sctp_tmit_chunk *tp1; 3205 3206 tsn = ntohl(desc->tsn_ifany); 3207 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3208 if (tp1->rec.data.TSN_seq == tsn) { 3209 /* found it */ 3210 break; 3211 } 3212 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3213 /* not found */ 3214 tp1 = NULL; 3215 break; 3216 } 3217 } 3218 if (tp1 == NULL) { 3219 /* 3220 * Do it the other way , aka without paying 3221 * attention to queue seq order. 3222 */ 3223 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3224 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3225 if (tp1->rec.data.TSN_seq == tsn) { 3226 /* found it */ 3227 break; 3228 } 3229 } 3230 } 3231 if (tp1 == NULL) { 3232 SCTP_STAT_INCR(sctps_pdrptsnnf); 3233 } 3234 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3235 uint8_t *ddp; 3236 3237 if (((flg & SCTP_BADCRC) == 0) && 3238 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3239 return (0); 3240 } 3241 if ((stcb->asoc.peers_rwnd == 0) && 3242 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3243 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3244 return (0); 3245 } 3246 if (stcb->asoc.peers_rwnd == 0 && 3247 (flg & SCTP_FROM_MIDDLE_BOX)) { 3248 SCTP_STAT_INCR(sctps_pdrpdizrw); 3249 return (0); 3250 } 3251 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3252 sizeof(struct sctp_data_chunk)); 3253 { 3254 unsigned int iii; 3255 3256 for (iii = 0; iii < sizeof(desc->data_bytes); 3257 iii++) { 3258 if (ddp[iii] != desc->data_bytes[iii]) { 3259 SCTP_STAT_INCR(sctps_pdrpbadd); 3260 return (-1); 3261 } 3262 } 3263 } 3264 3265 if (tp1->do_rtt) { 3266 /* 3267 * this guy had a RTO calculation 3268 * pending on it, cancel it 3269 */ 3270 if (tp1->whoTo->rto_needed == 0) { 3271 tp1->whoTo->rto_needed = 1; 3272 } 3273 tp1->do_rtt = 0; 3274 } 3275 SCTP_STAT_INCR(sctps_pdrpmark); 3276 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3277 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3278 /* 3279 * mark it as if we were doing a FR, since 3280 * we will be getting gap ack reports behind 3281 * the info from the router. 3282 */ 3283 tp1->rec.data.doing_fast_retransmit = 1; 3284 /* 3285 * mark the tsn with what sequences can 3286 * cause a new FR. 3287 */ 3288 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3289 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3290 } else { 3291 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3292 } 3293 3294 /* restart the timer */ 3295 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3296 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3297 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3298 stcb, tp1->whoTo); 3299 3300 /* fix counts and things */ 3301 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3302 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3303 tp1->whoTo->flight_size, 3304 tp1->book_size, 3305 (uintptr_t) stcb, 3306 tp1->rec.data.TSN_seq); 3307 } 3308 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3309 sctp_flight_size_decrease(tp1); 3310 sctp_total_flight_decrease(stcb, tp1); 3311 } 3312 tp1->sent = SCTP_DATAGRAM_RESEND; 3313 } { 3314 /* audit code */ 3315 unsigned int audit; 3316 3317 audit = 0; 3318 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3319 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3320 audit++; 3321 } 3322 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3323 sctp_next) { 3324 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3325 audit++; 3326 } 3327 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3328 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3329 audit, stcb->asoc.sent_queue_retran_cnt); 3330 #ifndef SCTP_AUDITING_ENABLED 3331 stcb->asoc.sent_queue_retran_cnt = audit; 3332 #endif 3333 } 3334 } 3335 } 3336 break; 3337 case SCTP_ASCONF: 3338 { 3339 struct sctp_tmit_chunk *asconf; 3340 3341 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3342 sctp_next) { 3343 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3344 break; 3345 } 3346 } 3347 if (asconf) { 3348 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3349 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3350 asconf->sent = SCTP_DATAGRAM_RESEND; 3351 asconf->snd_count--; 3352 } 3353 } 3354 break; 3355 case SCTP_INITIATION: 3356 /* resend the INIT */ 3357 stcb->asoc.dropped_special_cnt++; 3358 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3359 /* 3360 * If we can get it in, in a few attempts we do 3361 * this, otherwise we let the timer fire. 3362 */ 3363 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3364 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3365 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3366 } 3367 break; 3368 case SCTP_SELECTIVE_ACK: 3369 case SCTP_NR_SELECTIVE_ACK: 3370 /* resend the sack */ 3371 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3372 break; 3373 case SCTP_HEARTBEAT_REQUEST: 3374 /* resend a demand HB */ 3375 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3376 /* 3377 * Only retransmit if we KNOW we wont destroy the 3378 * tcb 3379 */ 3380 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3381 } 3382 break; 3383 case SCTP_SHUTDOWN: 3384 sctp_send_shutdown(stcb, net); 3385 break; 3386 case SCTP_SHUTDOWN_ACK: 3387 sctp_send_shutdown_ack(stcb, net); 3388 break; 3389 case SCTP_COOKIE_ECHO: 3390 { 3391 struct sctp_tmit_chunk *cookie; 3392 3393 cookie = NULL; 3394 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3395 sctp_next) { 3396 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3397 break; 3398 } 3399 } 3400 if (cookie) { 3401 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3402 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3403 cookie->sent = SCTP_DATAGRAM_RESEND; 3404 sctp_stop_all_cookie_timers(stcb); 3405 } 3406 } 3407 break; 3408 case SCTP_COOKIE_ACK: 3409 sctp_send_cookie_ack(stcb); 3410 break; 3411 case SCTP_ASCONF_ACK: 3412 /* resend last asconf ack */ 3413 sctp_send_asconf_ack(stcb); 3414 break; 3415 case SCTP_FORWARD_CUM_TSN: 3416 send_forward_tsn(stcb, &stcb->asoc); 3417 break; 3418 /* can't do anything with these */ 3419 case SCTP_PACKET_DROPPED: 3420 case SCTP_INITIATION_ACK: /* this should not happen */ 3421 case SCTP_HEARTBEAT_ACK: 3422 case SCTP_ABORT_ASSOCIATION: 3423 case SCTP_OPERATION_ERROR: 3424 case SCTP_SHUTDOWN_COMPLETE: 3425 case SCTP_ECN_ECHO: 3426 case SCTP_ECN_CWR: 3427 default: 3428 break; 3429 } 3430 return (0); 3431 } 3432 3433 void 3434 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3435 { 3436 uint32_t i; 3437 uint16_t temp; 3438 3439 /* 3440 * We set things to 0xffff since this is the last delivered sequence 3441 * and we will be sending in 0 after the reset. 3442 */ 3443 3444 if (number_entries) { 3445 for (i = 0; i < number_entries; i++) { 3446 temp = ntohs(list[i]); 3447 if (temp >= stcb->asoc.streamincnt) { 3448 continue; 3449 } 3450 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3451 } 3452 } else { 3453 list = NULL; 3454 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3455 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3456 } 3457 } 3458 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3459 } 3460 3461 static void 3462 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3463 { 3464 uint32_t i; 3465 uint16_t temp; 3466 3467 if (number_entries > 0) { 3468 for (i = 0; i < number_entries; i++) { 3469 temp = ntohs(list[i]); 3470 if (temp >= stcb->asoc.streamoutcnt) { 3471 /* no such stream */ 3472 continue; 3473 } 3474 stcb->asoc.strmout[temp].next_sequence_send = 0; 3475 } 3476 } else { 3477 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3478 stcb->asoc.strmout[i].next_sequence_send = 0; 3479 } 3480 } 3481 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3482 } 3483 3484 3485 struct sctp_stream_reset_request * 3486 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3487 { 3488 struct sctp_association *asoc; 3489 struct sctp_chunkhdr *ch; 3490 struct sctp_stream_reset_request *r; 3491 struct sctp_tmit_chunk *chk; 3492 int len, clen; 3493 3494 asoc = &stcb->asoc; 3495 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3496 asoc->stream_reset_outstanding = 0; 3497 return (NULL); 3498 } 3499 if (stcb->asoc.str_reset == NULL) { 3500 asoc->stream_reset_outstanding = 0; 3501 return (NULL); 3502 } 3503 chk = stcb->asoc.str_reset; 3504 if (chk->data == NULL) { 3505 return (NULL); 3506 } 3507 if (bchk) { 3508 /* he wants a copy of the chk pointer */ 3509 *bchk = chk; 3510 } 3511 clen = chk->send_size; 3512 ch = mtod(chk->data, struct sctp_chunkhdr *); 3513 r = (struct sctp_stream_reset_request *)(ch + 1); 3514 if (ntohl(r->request_seq) == seq) { 3515 /* found it */ 3516 return (r); 3517 } 3518 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3519 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3520 /* move to the next one, there can only be a max of two */ 3521 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3522 if (ntohl(r->request_seq) == seq) { 3523 return (r); 3524 } 3525 } 3526 /* that seq is not here */ 3527 return (NULL); 3528 } 3529 3530 static void 3531 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3532 { 3533 struct sctp_association *asoc; 3534 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3535 3536 if (stcb->asoc.str_reset == NULL) { 3537 return; 3538 } 3539 asoc = &stcb->asoc; 3540 3541 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3542 TAILQ_REMOVE(&asoc->control_send_queue, 3543 chk, 3544 sctp_next); 3545 if (chk->data) { 3546 sctp_m_freem(chk->data); 3547 chk->data = NULL; 3548 } 3549 asoc->ctrl_queue_cnt--; 3550 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3551 /* sa_ignore NO_NULL_CHK */ 3552 stcb->asoc.str_reset = NULL; 3553 } 3554 3555 3556 static int 3557 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3558 uint32_t seq, uint32_t action, 3559 struct sctp_stream_reset_response *respin) 3560 { 3561 uint16_t type; 3562 int lparm_len; 3563 struct sctp_association *asoc = &stcb->asoc; 3564 struct sctp_tmit_chunk *chk; 3565 struct sctp_stream_reset_request *req_param; 3566 struct sctp_stream_reset_out_request *req_out_param; 3567 struct sctp_stream_reset_in_request *req_in_param; 3568 uint32_t number_entries; 3569 3570 if (asoc->stream_reset_outstanding == 0) { 3571 /* duplicate */ 3572 return (0); 3573 } 3574 if (seq == stcb->asoc.str_reset_seq_out) { 3575 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3576 if (req_param != NULL) { 3577 stcb->asoc.str_reset_seq_out++; 3578 type = ntohs(req_param->ph.param_type); 3579 lparm_len = ntohs(req_param->ph.param_length); 3580 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3581 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3582 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3583 asoc->stream_reset_out_is_outstanding = 0; 3584 if (asoc->stream_reset_outstanding) 3585 asoc->stream_reset_outstanding--; 3586 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3587 /* do it */ 3588 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3589 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3590 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3591 } else { 3592 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3593 } 3594 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3595 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3596 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3597 if (asoc->stream_reset_outstanding) 3598 asoc->stream_reset_outstanding--; 3599 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3600 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3601 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3602 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3603 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3604 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3605 } 3606 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3607 /* Ok we now may have more streams */ 3608 int num_stream; 3609 3610 num_stream = stcb->asoc.strm_pending_add_size; 3611 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3612 /* TSNH */ 3613 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3614 } 3615 stcb->asoc.strm_pending_add_size = 0; 3616 if (asoc->stream_reset_outstanding) 3617 asoc->stream_reset_outstanding--; 3618 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3619 /* Put the new streams into effect */ 3620 stcb->asoc.streamoutcnt += num_stream; 3621 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3622 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3623 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3624 SCTP_STREAM_CHANGE_DENIED); 3625 } else { 3626 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3627 SCTP_STREAM_CHANGE_FAILED); 3628 } 3629 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3630 if (asoc->stream_reset_outstanding) 3631 asoc->stream_reset_outstanding--; 3632 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3633 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3634 SCTP_STREAM_CHANGE_DENIED); 3635 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3636 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3637 SCTP_STREAM_CHANGE_FAILED); 3638 } 3639 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3640 /** 3641 * a) Adopt the new in tsn. 3642 * b) reset the map 3643 * c) Adopt the new out-tsn 3644 */ 3645 struct sctp_stream_reset_response_tsn *resp; 3646 struct sctp_forward_tsn_chunk fwdtsn; 3647 int abort_flag = 0; 3648 3649 if (respin == NULL) { 3650 /* huh ? */ 3651 return (0); 3652 } 3653 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3654 return (0); 3655 } 3656 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3657 resp = (struct sctp_stream_reset_response_tsn *)respin; 3658 asoc->stream_reset_outstanding--; 3659 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3660 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3661 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3662 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3663 if (abort_flag) { 3664 return (1); 3665 } 3666 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3667 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3668 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3669 } 3670 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3671 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3672 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3673 3674 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3675 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3676 3677 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3678 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3679 3680 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3681 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3682 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3683 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3684 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3685 SCTP_ASSOC_RESET_DENIED); 3686 } else { 3687 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3688 SCTP_ASSOC_RESET_FAILED); 3689 } 3690 } 3691 /* get rid of the request and get the request flags */ 3692 if (asoc->stream_reset_outstanding == 0) { 3693 sctp_clean_up_stream_reset(stcb); 3694 } 3695 } 3696 } 3697 return (0); 3698 } 3699 3700 static void 3701 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3702 struct sctp_tmit_chunk *chk, 3703 struct sctp_stream_reset_in_request *req, int trunc) 3704 { 3705 uint32_t seq; 3706 int len, i; 3707 int number_entries; 3708 uint16_t temp; 3709 3710 /* 3711 * peer wants me to send a str-reset to him for my outgoing seq's if 3712 * seq_in is right. 3713 */ 3714 struct sctp_association *asoc = &stcb->asoc; 3715 3716 seq = ntohl(req->request_seq); 3717 if (asoc->str_reset_seq_in == seq) { 3718 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3719 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3720 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3721 } else if (trunc) { 3722 /* Can't do it, since they exceeded our buffer size */ 3723 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3724 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3725 len = ntohs(req->ph.param_length); 3726 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3727 for (i = 0; i < number_entries; i++) { 3728 temp = ntohs(req->list_of_streams[i]); 3729 req->list_of_streams[i] = temp; 3730 } 3731 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3732 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3733 asoc->str_reset_seq_out, 3734 seq, (asoc->sending_seq - 1)); 3735 asoc->stream_reset_out_is_outstanding = 1; 3736 asoc->str_reset = chk; 3737 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3738 stcb->asoc.stream_reset_outstanding++; 3739 } else { 3740 /* Can't do it, since we have sent one out */ 3741 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3742 } 3743 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3744 asoc->str_reset_seq_in++; 3745 } else if (asoc->str_reset_seq_in - 1 == seq) { 3746 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3747 } else if (asoc->str_reset_seq_in - 2 == seq) { 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3749 } else { 3750 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3751 } 3752 } 3753 3754 static int 3755 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3756 struct sctp_tmit_chunk *chk, 3757 struct sctp_stream_reset_tsn_request *req) 3758 { 3759 /* reset all in and out and update the tsn */ 3760 /* 3761 * A) reset my str-seq's on in and out. B) Select a receive next, 3762 * and set cum-ack to it. Also process this selected number as a 3763 * fwd-tsn as well. C) set in the response my next sending seq. 3764 */ 3765 struct sctp_forward_tsn_chunk fwdtsn; 3766 struct sctp_association *asoc = &stcb->asoc; 3767 int abort_flag = 0; 3768 uint32_t seq; 3769 3770 seq = ntohl(req->request_seq); 3771 if (asoc->str_reset_seq_in == seq) { 3772 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3773 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3774 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3775 } else { 3776 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3777 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3778 fwdtsn.ch.chunk_flags = 0; 3779 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3780 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3781 if (abort_flag) { 3782 return (1); 3783 } 3784 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3785 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3786 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3787 } 3788 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3789 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3790 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3791 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3792 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3793 atomic_add_int(&asoc->sending_seq, 1); 3794 /* save off historical data for retrans */ 3795 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3796 asoc->last_sending_seq[0] = asoc->sending_seq; 3797 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3798 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3799 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3800 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3801 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3802 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3803 } 3804 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3805 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3806 asoc->str_reset_seq_in++; 3807 } else if (asoc->str_reset_seq_in - 1 == seq) { 3808 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3809 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3810 } else if (asoc->str_reset_seq_in - 2 == seq) { 3811 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3812 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3813 } else { 3814 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3815 } 3816 return (0); 3817 } 3818 3819 static void 3820 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3821 struct sctp_tmit_chunk *chk, 3822 struct sctp_stream_reset_out_request *req, int trunc) 3823 { 3824 uint32_t seq, tsn; 3825 int number_entries, len; 3826 struct sctp_association *asoc = &stcb->asoc; 3827 3828 seq = ntohl(req->request_seq); 3829 3830 /* now if its not a duplicate we process it */ 3831 if (asoc->str_reset_seq_in == seq) { 3832 len = ntohs(req->ph.param_length); 3833 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3834 /* 3835 * the sender is resetting, handle the list issue.. we must 3836 * a) verify if we can do the reset, if so no problem b) If 3837 * we can't do the reset we must copy the request. c) queue 3838 * it, and setup the data in processor to trigger it off 3839 * when needed and dequeue all the queued data. 3840 */ 3841 tsn = ntohl(req->send_reset_at_tsn); 3842 3843 /* move the reset action back one */ 3844 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3845 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3846 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3847 } else if (trunc) { 3848 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3849 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3850 /* we can do it now */ 3851 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3852 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3853 } else { 3854 /* 3855 * we must queue it up and thus wait for the TSN's 3856 * to arrive that are at or before tsn 3857 */ 3858 struct sctp_stream_reset_list *liste; 3859 int siz; 3860 3861 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3862 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3863 siz, SCTP_M_STRESET); 3864 if (liste == NULL) { 3865 /* gak out of memory */ 3866 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3867 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3868 return; 3869 } 3870 liste->tsn = tsn; 3871 liste->number_entries = number_entries; 3872 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3873 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3874 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3875 } 3876 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3877 asoc->str_reset_seq_in++; 3878 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3879 /* 3880 * one seq back, just echo back last action since my 3881 * response was lost. 3882 */ 3883 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3884 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3885 /* 3886 * two seq back, just echo back last action since my 3887 * response was lost. 3888 */ 3889 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3890 } else { 3891 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3892 } 3893 } 3894 3895 static void 3896 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3897 struct sctp_stream_reset_add_strm *str_add) 3898 { 3899 /* 3900 * Peer is requesting to add more streams. If its within our 3901 * max-streams we will allow it. 3902 */ 3903 uint32_t num_stream, i; 3904 uint32_t seq; 3905 struct sctp_association *asoc = &stcb->asoc; 3906 struct sctp_queued_to_read *ctl, *nctl; 3907 3908 /* Get the number. */ 3909 seq = ntohl(str_add->request_seq); 3910 num_stream = ntohs(str_add->number_of_streams); 3911 /* Now what would be the new total? */ 3912 if (asoc->str_reset_seq_in == seq) { 3913 num_stream += stcb->asoc.streamincnt; 3914 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3915 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3916 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3917 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3918 (num_stream > 0xffff)) { 3919 /* We must reject it they ask for to many */ 3920 denied: 3921 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3922 } else { 3923 /* Ok, we can do that :-) */ 3924 struct sctp_stream_in *oldstrm; 3925 3926 /* save off the old */ 3927 oldstrm = stcb->asoc.strmin; 3928 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3929 (num_stream * sizeof(struct sctp_stream_in)), 3930 SCTP_M_STRMI); 3931 if (stcb->asoc.strmin == NULL) { 3932 stcb->asoc.strmin = oldstrm; 3933 goto denied; 3934 } 3935 /* copy off the old data */ 3936 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3937 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3938 stcb->asoc.strmin[i].stream_no = i; 3939 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3940 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3941 /* now anything on those queues? */ 3942 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3943 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3944 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3945 } 3946 } 3947 /* Init the new streams */ 3948 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3949 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3950 stcb->asoc.strmin[i].stream_no = i; 3951 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3952 stcb->asoc.strmin[i].delivery_started = 0; 3953 } 3954 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3955 /* update the size */ 3956 stcb->asoc.streamincnt = num_stream; 3957 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3958 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3959 } 3960 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3961 asoc->str_reset_seq_in++; 3962 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3963 /* 3964 * one seq back, just echo back last action since my 3965 * response was lost. 3966 */ 3967 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3968 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3969 /* 3970 * two seq back, just echo back last action since my 3971 * response was lost. 3972 */ 3973 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3974 } else { 3975 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3976 3977 } 3978 } 3979 3980 static void 3981 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3982 struct sctp_stream_reset_add_strm *str_add) 3983 { 3984 /* 3985 * Peer is requesting to add more streams. If its within our 3986 * max-streams we will allow it. 3987 */ 3988 uint16_t num_stream; 3989 uint32_t seq; 3990 struct sctp_association *asoc = &stcb->asoc; 3991 3992 /* Get the number. */ 3993 seq = ntohl(str_add->request_seq); 3994 num_stream = ntohs(str_add->number_of_streams); 3995 /* Now what would be the new total? */ 3996 if (asoc->str_reset_seq_in == seq) { 3997 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3998 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3999 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4000 } else if (stcb->asoc.stream_reset_outstanding) { 4001 /* We must reject it we have something pending */ 4002 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4003 } else { 4004 /* Ok, we can do that :-) */ 4005 int mychk; 4006 4007 mychk = stcb->asoc.streamoutcnt; 4008 mychk += num_stream; 4009 if (mychk < 0x10000) { 4010 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4011 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4012 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4013 } 4014 } else { 4015 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4016 } 4017 } 4018 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4019 asoc->str_reset_seq_in++; 4020 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4021 /* 4022 * one seq back, just echo back last action since my 4023 * response was lost. 4024 */ 4025 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4026 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4027 /* 4028 * two seq back, just echo back last action since my 4029 * response was lost. 4030 */ 4031 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4032 } else { 4033 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4034 } 4035 } 4036 4037 #ifdef __GNUC__ 4038 __attribute__((noinline)) 4039 #endif 4040 static int 4041 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4042 struct sctp_chunkhdr *ch_req) 4043 { 4044 uint16_t remaining_length, param_len, ptype; 4045 struct sctp_paramhdr pstore; 4046 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4047 uint32_t seq = 0; 4048 int num_req = 0; 4049 int trunc = 0; 4050 struct sctp_tmit_chunk *chk; 4051 struct sctp_chunkhdr *ch; 4052 struct sctp_paramhdr *ph; 4053 int ret_code = 0; 4054 int num_param = 0; 4055 4056 /* now it may be a reset or a reset-response */ 4057 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4058 4059 /* setup for adding the response */ 4060 sctp_alloc_a_chunk(stcb, chk); 4061 if (chk == NULL) { 4062 return (ret_code); 4063 } 4064 chk->copy_by_ref = 0; 4065 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4066 chk->rec.chunk_id.can_take_data = 0; 4067 chk->flags = 0; 4068 chk->asoc = &stcb->asoc; 4069 chk->no_fr_allowed = 0; 4070 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4071 chk->book_size_scale = 0; 4072 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4073 if (chk->data == NULL) { 4074 strres_nochunk: 4075 if (chk->data) { 4076 sctp_m_freem(chk->data); 4077 chk->data = NULL; 4078 } 4079 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4080 return (ret_code); 4081 } 4082 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4083 4084 /* setup chunk parameters */ 4085 chk->sent = SCTP_DATAGRAM_UNSENT; 4086 chk->snd_count = 0; 4087 chk->whoTo = NULL; 4088 4089 ch = mtod(chk->data, struct sctp_chunkhdr *); 4090 ch->chunk_type = SCTP_STREAM_RESET; 4091 ch->chunk_flags = 0; 4092 ch->chunk_length = htons(chk->send_size); 4093 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4094 offset += sizeof(struct sctp_chunkhdr); 4095 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4096 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4097 if (ph == NULL) { 4098 /* TSNH */ 4099 break; 4100 } 4101 param_len = ntohs(ph->param_length); 4102 if ((param_len > remaining_length) || 4103 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4104 /* bad parameter length */ 4105 break; 4106 } 4107 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4108 (uint8_t *) & cstore); 4109 if (ph == NULL) { 4110 /* TSNH */ 4111 break; 4112 } 4113 ptype = ntohs(ph->param_type); 4114 num_param++; 4115 if (param_len > sizeof(cstore)) { 4116 trunc = 1; 4117 } else { 4118 trunc = 0; 4119 } 4120 if (num_param > SCTP_MAX_RESET_PARAMS) { 4121 /* hit the max of parameters already sorry.. */ 4122 break; 4123 } 4124 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4125 struct sctp_stream_reset_out_request *req_out; 4126 4127 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4128 break; 4129 } 4130 req_out = (struct sctp_stream_reset_out_request *)ph; 4131 num_req++; 4132 if (stcb->asoc.stream_reset_outstanding) { 4133 seq = ntohl(req_out->response_seq); 4134 if (seq == stcb->asoc.str_reset_seq_out) { 4135 /* implicit ack */ 4136 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4137 } 4138 } 4139 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4140 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4141 struct sctp_stream_reset_add_strm *str_add; 4142 4143 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4144 break; 4145 } 4146 str_add = (struct sctp_stream_reset_add_strm *)ph; 4147 num_req++; 4148 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4149 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4150 struct sctp_stream_reset_add_strm *str_add; 4151 4152 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4153 break; 4154 } 4155 str_add = (struct sctp_stream_reset_add_strm *)ph; 4156 num_req++; 4157 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4158 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4159 struct sctp_stream_reset_in_request *req_in; 4160 4161 num_req++; 4162 req_in = (struct sctp_stream_reset_in_request *)ph; 4163 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4164 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4165 struct sctp_stream_reset_tsn_request *req_tsn; 4166 4167 num_req++; 4168 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4169 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4170 ret_code = 1; 4171 goto strres_nochunk; 4172 } 4173 /* no more */ 4174 break; 4175 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4176 struct sctp_stream_reset_response *resp; 4177 uint32_t result; 4178 4179 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4180 break; 4181 } 4182 resp = (struct sctp_stream_reset_response *)ph; 4183 seq = ntohl(resp->response_seq); 4184 result = ntohl(resp->result); 4185 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4186 ret_code = 1; 4187 goto strres_nochunk; 4188 } 4189 } else { 4190 break; 4191 } 4192 offset += SCTP_SIZE32(param_len); 4193 if (remaining_length >= SCTP_SIZE32(param_len)) { 4194 remaining_length -= SCTP_SIZE32(param_len); 4195 } else { 4196 remaining_length = 0; 4197 } 4198 } 4199 if (num_req == 0) { 4200 /* we have no response free the stuff */ 4201 goto strres_nochunk; 4202 } 4203 /* ok we have a chunk to link in */ 4204 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4205 chk, 4206 sctp_next); 4207 stcb->asoc.ctrl_queue_cnt++; 4208 return (ret_code); 4209 } 4210 4211 /* 4212 * Handle a router or endpoints report of a packet loss, there are two ways 4213 * to handle this, either we get the whole packet and must disect it 4214 * ourselves (possibly with truncation and or corruption) or it is a summary 4215 * from a middle box that did the disectting for us. 4216 */ 4217 static void 4218 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4219 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4220 { 4221 uint32_t bottle_bw, on_queue; 4222 uint16_t trunc_len; 4223 unsigned int chlen; 4224 unsigned int at; 4225 struct sctp_chunk_desc desc; 4226 struct sctp_chunkhdr *ch; 4227 4228 chlen = ntohs(cp->ch.chunk_length); 4229 chlen -= sizeof(struct sctp_pktdrop_chunk); 4230 /* XXX possible chlen underflow */ 4231 if (chlen == 0) { 4232 ch = NULL; 4233 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4234 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4235 } else { 4236 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4237 chlen -= sizeof(struct sctphdr); 4238 /* XXX possible chlen underflow */ 4239 memset(&desc, 0, sizeof(desc)); 4240 } 4241 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4242 if (trunc_len > limit) { 4243 trunc_len = limit; 4244 } 4245 /* now the chunks themselves */ 4246 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4247 desc.chunk_type = ch->chunk_type; 4248 /* get amount we need to move */ 4249 at = ntohs(ch->chunk_length); 4250 if (at < sizeof(struct sctp_chunkhdr)) { 4251 /* corrupt chunk, maybe at the end? */ 4252 SCTP_STAT_INCR(sctps_pdrpcrupt); 4253 break; 4254 } 4255 if (trunc_len == 0) { 4256 /* we are supposed to have all of it */ 4257 if (at > chlen) { 4258 /* corrupt skip it */ 4259 SCTP_STAT_INCR(sctps_pdrpcrupt); 4260 break; 4261 } 4262 } else { 4263 /* is there enough of it left ? */ 4264 if (desc.chunk_type == SCTP_DATA) { 4265 if (chlen < (sizeof(struct sctp_data_chunk) + 4266 sizeof(desc.data_bytes))) { 4267 break; 4268 } 4269 } else { 4270 if (chlen < sizeof(struct sctp_chunkhdr)) { 4271 break; 4272 } 4273 } 4274 } 4275 if (desc.chunk_type == SCTP_DATA) { 4276 /* can we get out the tsn? */ 4277 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4278 SCTP_STAT_INCR(sctps_pdrpmbda); 4279 4280 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4281 /* yep */ 4282 struct sctp_data_chunk *dcp; 4283 uint8_t *ddp; 4284 unsigned int iii; 4285 4286 dcp = (struct sctp_data_chunk *)ch; 4287 ddp = (uint8_t *) (dcp + 1); 4288 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4289 desc.data_bytes[iii] = ddp[iii]; 4290 } 4291 desc.tsn_ifany = dcp->dp.tsn; 4292 } else { 4293 /* nope we are done. */ 4294 SCTP_STAT_INCR(sctps_pdrpnedat); 4295 break; 4296 } 4297 } else { 4298 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4299 SCTP_STAT_INCR(sctps_pdrpmbct); 4300 } 4301 4302 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4303 SCTP_STAT_INCR(sctps_pdrppdbrk); 4304 break; 4305 } 4306 if (SCTP_SIZE32(at) > chlen) { 4307 break; 4308 } 4309 chlen -= SCTP_SIZE32(at); 4310 if (chlen < sizeof(struct sctp_chunkhdr)) { 4311 /* done, none left */ 4312 break; 4313 } 4314 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4315 } 4316 /* Now update any rwnd --- possibly */ 4317 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4318 /* From a peer, we get a rwnd report */ 4319 uint32_t a_rwnd; 4320 4321 SCTP_STAT_INCR(sctps_pdrpfehos); 4322 4323 bottle_bw = ntohl(cp->bottle_bw); 4324 on_queue = ntohl(cp->current_onq); 4325 if (bottle_bw && on_queue) { 4326 /* a rwnd report is in here */ 4327 if (bottle_bw > on_queue) 4328 a_rwnd = bottle_bw - on_queue; 4329 else 4330 a_rwnd = 0; 4331 4332 if (a_rwnd == 0) 4333 stcb->asoc.peers_rwnd = 0; 4334 else { 4335 if (a_rwnd > stcb->asoc.total_flight) { 4336 stcb->asoc.peers_rwnd = 4337 a_rwnd - stcb->asoc.total_flight; 4338 } else { 4339 stcb->asoc.peers_rwnd = 0; 4340 } 4341 if (stcb->asoc.peers_rwnd < 4342 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4343 /* SWS sender side engages */ 4344 stcb->asoc.peers_rwnd = 0; 4345 } 4346 } 4347 } 4348 } else { 4349 SCTP_STAT_INCR(sctps_pdrpfmbox); 4350 } 4351 4352 /* now middle boxes in sat networks get a cwnd bump */ 4353 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4354 (stcb->asoc.sat_t3_loss_recovery == 0) && 4355 (stcb->asoc.sat_network)) { 4356 /* 4357 * This is debateable but for sat networks it makes sense 4358 * Note if a T3 timer has went off, we will prohibit any 4359 * changes to cwnd until we exit the t3 loss recovery. 4360 */ 4361 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4362 net, cp, &bottle_bw, &on_queue); 4363 } 4364 } 4365 4366 /* 4367 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4368 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4369 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4370 * length of the complete packet outputs: - length: modified to remaining 4371 * length after control processing - netp: modified to new sctp_nets after 4372 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4373 * bad packet,...) otherwise return the tcb for this packet 4374 */ 4375 #ifdef __GNUC__ 4376 __attribute__((noinline)) 4377 #endif 4378 static struct sctp_tcb * 4379 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4380 struct sockaddr *src, struct sockaddr *dst, 4381 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4382 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4383 uint8_t mflowtype, uint32_t mflowid, 4384 uint32_t vrf_id, uint16_t port) 4385 { 4386 struct sctp_association *asoc; 4387 struct mbuf *op_err; 4388 char msg[SCTP_DIAG_INFO_LEN]; 4389 uint32_t vtag_in; 4390 int num_chunks = 0; /* number of control chunks processed */ 4391 uint32_t chk_length; 4392 int ret; 4393 int abort_no_unlock = 0; 4394 int ecne_seen = 0; 4395 4396 /* 4397 * How big should this be, and should it be alloc'd? Lets try the 4398 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4399 * until we get into jumbo grams and such.. 4400 */ 4401 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4402 struct sctp_tcb *locked_tcb = stcb; 4403 int got_auth = 0; 4404 uint32_t auth_offset = 0, auth_len = 0; 4405 int auth_skipped = 0; 4406 int asconf_cnt = 0; 4407 4408 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4409 struct socket *so; 4410 4411 #endif 4412 4413 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4414 iphlen, *offset, length, (void *)stcb); 4415 4416 /* validate chunk header length... */ 4417 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4418 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4419 ntohs(ch->chunk_length)); 4420 if (locked_tcb) { 4421 SCTP_TCB_UNLOCK(locked_tcb); 4422 } 4423 return (NULL); 4424 } 4425 /* 4426 * validate the verification tag 4427 */ 4428 vtag_in = ntohl(sh->v_tag); 4429 4430 if (locked_tcb) { 4431 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4432 } 4433 if (ch->chunk_type == SCTP_INITIATION) { 4434 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4435 ntohs(ch->chunk_length), vtag_in); 4436 if (vtag_in != 0) { 4437 /* protocol error- silently discard... */ 4438 SCTP_STAT_INCR(sctps_badvtag); 4439 if (locked_tcb) { 4440 SCTP_TCB_UNLOCK(locked_tcb); 4441 } 4442 return (NULL); 4443 } 4444 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4445 /* 4446 * If there is no stcb, skip the AUTH chunk and process 4447 * later after a stcb is found (to validate the lookup was 4448 * valid. 4449 */ 4450 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4451 (stcb == NULL) && 4452 (inp->auth_supported == 1)) { 4453 /* save this chunk for later processing */ 4454 auth_skipped = 1; 4455 auth_offset = *offset; 4456 auth_len = ntohs(ch->chunk_length); 4457 4458 /* (temporarily) move past this chunk */ 4459 *offset += SCTP_SIZE32(auth_len); 4460 if (*offset >= length) { 4461 /* no more data left in the mbuf chain */ 4462 *offset = length; 4463 if (locked_tcb) { 4464 SCTP_TCB_UNLOCK(locked_tcb); 4465 } 4466 return (NULL); 4467 } 4468 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4469 sizeof(struct sctp_chunkhdr), chunk_buf); 4470 } 4471 if (ch == NULL) { 4472 /* Help */ 4473 *offset = length; 4474 if (locked_tcb) { 4475 SCTP_TCB_UNLOCK(locked_tcb); 4476 } 4477 return (NULL); 4478 } 4479 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4480 goto process_control_chunks; 4481 } 4482 /* 4483 * first check if it's an ASCONF with an unknown src addr we 4484 * need to look inside to find the association 4485 */ 4486 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4487 struct sctp_chunkhdr *asconf_ch = ch; 4488 uint32_t asconf_offset = 0, asconf_len = 0; 4489 4490 /* inp's refcount may be reduced */ 4491 SCTP_INP_INCR_REF(inp); 4492 4493 asconf_offset = *offset; 4494 do { 4495 asconf_len = ntohs(asconf_ch->chunk_length); 4496 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4497 break; 4498 stcb = sctp_findassociation_ep_asconf(m, 4499 *offset, 4500 dst, 4501 sh, &inp, netp, vrf_id); 4502 if (stcb != NULL) 4503 break; 4504 asconf_offset += SCTP_SIZE32(asconf_len); 4505 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4506 sizeof(struct sctp_chunkhdr), chunk_buf); 4507 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4508 if (stcb == NULL) { 4509 /* 4510 * reduce inp's refcount if not reduced in 4511 * sctp_findassociation_ep_asconf(). 4512 */ 4513 SCTP_INP_DECR_REF(inp); 4514 } else { 4515 locked_tcb = stcb; 4516 } 4517 4518 /* now go back and verify any auth chunk to be sure */ 4519 if (auth_skipped && (stcb != NULL)) { 4520 struct sctp_auth_chunk *auth; 4521 4522 auth = (struct sctp_auth_chunk *) 4523 sctp_m_getptr(m, auth_offset, 4524 auth_len, chunk_buf); 4525 got_auth = 1; 4526 auth_skipped = 0; 4527 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4528 auth_offset)) { 4529 /* auth HMAC failed so dump it */ 4530 *offset = length; 4531 if (locked_tcb) { 4532 SCTP_TCB_UNLOCK(locked_tcb); 4533 } 4534 return (NULL); 4535 } else { 4536 /* remaining chunks are HMAC checked */ 4537 stcb->asoc.authenticated = 1; 4538 } 4539 } 4540 } 4541 if (stcb == NULL) { 4542 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4543 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4544 msg); 4545 /* no association, so it's out of the blue... */ 4546 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4547 mflowtype, mflowid, 4548 vrf_id, port); 4549 *offset = length; 4550 if (locked_tcb) { 4551 SCTP_TCB_UNLOCK(locked_tcb); 4552 } 4553 return (NULL); 4554 } 4555 asoc = &stcb->asoc; 4556 /* ABORT and SHUTDOWN can use either v_tag... */ 4557 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4558 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4559 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4560 /* Take the T-bit always into account. */ 4561 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4562 (vtag_in == asoc->my_vtag)) || 4563 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4564 (vtag_in == asoc->peer_vtag))) { 4565 /* this is valid */ 4566 } else { 4567 /* drop this packet... */ 4568 SCTP_STAT_INCR(sctps_badvtag); 4569 if (locked_tcb) { 4570 SCTP_TCB_UNLOCK(locked_tcb); 4571 } 4572 return (NULL); 4573 } 4574 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4575 if (vtag_in != asoc->my_vtag) { 4576 /* 4577 * this could be a stale SHUTDOWN-ACK or the 4578 * peer never got the SHUTDOWN-COMPLETE and 4579 * is still hung; we have started a new asoc 4580 * but it won't complete until the shutdown 4581 * is completed 4582 */ 4583 if (locked_tcb) { 4584 SCTP_TCB_UNLOCK(locked_tcb); 4585 } 4586 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4587 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4588 msg); 4589 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4590 sh, inp, op_err, 4591 mflowtype, mflowid, 4592 vrf_id, port); 4593 return (NULL); 4594 } 4595 } else { 4596 /* for all other chunks, vtag must match */ 4597 if (vtag_in != asoc->my_vtag) { 4598 /* invalid vtag... */ 4599 SCTPDBG(SCTP_DEBUG_INPUT3, 4600 "invalid vtag: %xh, expect %xh\n", 4601 vtag_in, asoc->my_vtag); 4602 SCTP_STAT_INCR(sctps_badvtag); 4603 if (locked_tcb) { 4604 SCTP_TCB_UNLOCK(locked_tcb); 4605 } 4606 *offset = length; 4607 return (NULL); 4608 } 4609 } 4610 } /* end if !SCTP_COOKIE_ECHO */ 4611 /* 4612 * process all control chunks... 4613 */ 4614 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4615 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4616 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4617 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4618 /* implied cookie-ack.. we must have lost the ack */ 4619 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4620 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4621 stcb->asoc.overall_error_count, 4622 0, 4623 SCTP_FROM_SCTP_INPUT, 4624 __LINE__); 4625 } 4626 stcb->asoc.overall_error_count = 0; 4627 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4628 *netp); 4629 } 4630 process_control_chunks: 4631 while (IS_SCTP_CONTROL(ch)) { 4632 /* validate chunk length */ 4633 chk_length = ntohs(ch->chunk_length); 4634 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4635 ch->chunk_type, chk_length); 4636 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4637 if (chk_length < sizeof(*ch) || 4638 (*offset + (int)chk_length) > length) { 4639 *offset = length; 4640 if (locked_tcb) { 4641 SCTP_TCB_UNLOCK(locked_tcb); 4642 } 4643 return (NULL); 4644 } 4645 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4646 /* 4647 * INIT-ACK only gets the init ack "header" portion only 4648 * because we don't have to process the peer's COOKIE. All 4649 * others get a complete chunk. 4650 */ 4651 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4652 (ch->chunk_type == SCTP_INITIATION)) { 4653 /* get an init-ack chunk */ 4654 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4655 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4656 if (ch == NULL) { 4657 *offset = length; 4658 if (locked_tcb) { 4659 SCTP_TCB_UNLOCK(locked_tcb); 4660 } 4661 return (NULL); 4662 } 4663 } else { 4664 /* For cookies and all other chunks. */ 4665 if (chk_length > sizeof(chunk_buf)) { 4666 /* 4667 * use just the size of the chunk buffer so 4668 * the front part of our chunks fit in 4669 * contiguous space up to the chunk buffer 4670 * size (508 bytes). For chunks that need to 4671 * get more than that they must use the 4672 * sctp_m_getptr() function or other means 4673 * (e.g. know how to parse mbuf chains). 4674 * Cookies do this already. 4675 */ 4676 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4677 (sizeof(chunk_buf) - 4), 4678 chunk_buf); 4679 if (ch == NULL) { 4680 *offset = length; 4681 if (locked_tcb) { 4682 SCTP_TCB_UNLOCK(locked_tcb); 4683 } 4684 return (NULL); 4685 } 4686 } else { 4687 /* We can fit it all */ 4688 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4689 chk_length, chunk_buf); 4690 if (ch == NULL) { 4691 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4692 *offset = length; 4693 if (locked_tcb) { 4694 SCTP_TCB_UNLOCK(locked_tcb); 4695 } 4696 return (NULL); 4697 } 4698 } 4699 } 4700 num_chunks++; 4701 /* Save off the last place we got a control from */ 4702 if (stcb != NULL) { 4703 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4704 /* 4705 * allow last_control to be NULL if 4706 * ASCONF... ASCONF processing will find the 4707 * right net later 4708 */ 4709 if ((netp != NULL) && (*netp != NULL)) 4710 stcb->asoc.last_control_chunk_from = *netp; 4711 } 4712 } 4713 #ifdef SCTP_AUDITING_ENABLED 4714 sctp_audit_log(0xB0, ch->chunk_type); 4715 #endif 4716 4717 /* check to see if this chunk required auth, but isn't */ 4718 if ((stcb != NULL) && 4719 (stcb->asoc.auth_supported == 1) && 4720 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4721 !stcb->asoc.authenticated) { 4722 /* "silently" ignore */ 4723 SCTP_STAT_INCR(sctps_recvauthmissing); 4724 goto next_chunk; 4725 } 4726 switch (ch->chunk_type) { 4727 case SCTP_INITIATION: 4728 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4729 /* The INIT chunk must be the only chunk. */ 4730 if ((num_chunks > 1) || 4731 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4732 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4733 "INIT not the only chunk"); 4734 sctp_abort_association(inp, stcb, m, iphlen, 4735 src, dst, sh, op_err, 4736 mflowtype, mflowid, 4737 vrf_id, port); 4738 *offset = length; 4739 return (NULL); 4740 } 4741 /* Honor our resource limit. */ 4742 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4743 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4744 sctp_abort_association(inp, stcb, m, iphlen, 4745 src, dst, sh, op_err, 4746 mflowtype, mflowid, 4747 vrf_id, port); 4748 *offset = length; 4749 return (NULL); 4750 } 4751 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4752 (struct sctp_init_chunk *)ch, inp, 4753 stcb, &abort_no_unlock, 4754 mflowtype, mflowid, 4755 vrf_id, port); 4756 *offset = length; 4757 if ((!abort_no_unlock) && (locked_tcb)) { 4758 SCTP_TCB_UNLOCK(locked_tcb); 4759 } 4760 return (NULL); 4761 break; 4762 case SCTP_PAD_CHUNK: 4763 break; 4764 case SCTP_INITIATION_ACK: 4765 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4766 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4767 /* We are not interested anymore */ 4768 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4769 ; 4770 } else { 4771 if (locked_tcb != stcb) { 4772 /* Very unlikely */ 4773 SCTP_TCB_UNLOCK(locked_tcb); 4774 } 4775 *offset = length; 4776 if (stcb) { 4777 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4778 so = SCTP_INP_SO(inp); 4779 atomic_add_int(&stcb->asoc.refcnt, 1); 4780 SCTP_TCB_UNLOCK(stcb); 4781 SCTP_SOCKET_LOCK(so, 1); 4782 SCTP_TCB_LOCK(stcb); 4783 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4784 #endif 4785 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4786 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4787 SCTP_SOCKET_UNLOCK(so, 1); 4788 #endif 4789 } 4790 return (NULL); 4791 } 4792 } 4793 /* The INIT-ACK chunk must be the only chunk. */ 4794 if ((num_chunks > 1) || 4795 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4796 *offset = length; 4797 if (locked_tcb) { 4798 SCTP_TCB_UNLOCK(locked_tcb); 4799 } 4800 return (NULL); 4801 } 4802 if ((netp) && (*netp)) { 4803 ret = sctp_handle_init_ack(m, iphlen, *offset, 4804 src, dst, sh, 4805 (struct sctp_init_ack_chunk *)ch, 4806 stcb, *netp, 4807 &abort_no_unlock, 4808 mflowtype, mflowid, 4809 vrf_id); 4810 } else { 4811 ret = -1; 4812 } 4813 *offset = length; 4814 if (abort_no_unlock) { 4815 return (NULL); 4816 } 4817 /* 4818 * Special case, I must call the output routine to 4819 * get the cookie echoed 4820 */ 4821 if ((stcb != NULL) && (ret == 0)) { 4822 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4823 } 4824 if (locked_tcb) { 4825 SCTP_TCB_UNLOCK(locked_tcb); 4826 } 4827 return (NULL); 4828 break; 4829 case SCTP_SELECTIVE_ACK: 4830 { 4831 struct sctp_sack_chunk *sack; 4832 int abort_now = 0; 4833 uint32_t a_rwnd, cum_ack; 4834 uint16_t num_seg, num_dup; 4835 uint8_t flags; 4836 int offset_seg, offset_dup; 4837 4838 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4839 SCTP_STAT_INCR(sctps_recvsacks); 4840 if (stcb == NULL) { 4841 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4842 break; 4843 } 4844 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4845 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4846 break; 4847 } 4848 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4849 /*- 4850 * If we have sent a shutdown-ack, we will pay no 4851 * attention to a sack sent in to us since 4852 * we don't care anymore. 4853 */ 4854 break; 4855 } 4856 sack = (struct sctp_sack_chunk *)ch; 4857 flags = ch->chunk_flags; 4858 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4859 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4860 num_dup = ntohs(sack->sack.num_dup_tsns); 4861 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4862 if (sizeof(struct sctp_sack_chunk) + 4863 num_seg * sizeof(struct sctp_gap_ack_block) + 4864 num_dup * sizeof(uint32_t) != chk_length) { 4865 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4866 break; 4867 } 4868 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4869 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4870 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4871 cum_ack, num_seg, a_rwnd); 4872 stcb->asoc.seen_a_sack_this_pkt = 1; 4873 if ((stcb->asoc.pr_sctp_cnt == 0) && 4874 (num_seg == 0) && 4875 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4876 (stcb->asoc.saw_sack_with_frags == 0) && 4877 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4878 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4879 ) { 4880 /* 4881 * We have a SIMPLE sack having no 4882 * prior segments and data on sent 4883 * queue to be acked.. Use the 4884 * faster path sack processing. We 4885 * also allow window update sacks 4886 * with no missing segments to go 4887 * this way too. 4888 */ 4889 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4890 } else { 4891 if (netp && *netp) 4892 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4893 num_seg, 0, num_dup, &abort_now, flags, 4894 cum_ack, a_rwnd, ecne_seen); 4895 } 4896 if (abort_now) { 4897 /* ABORT signal from sack processing */ 4898 *offset = length; 4899 return (NULL); 4900 } 4901 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4902 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4903 (stcb->asoc.stream_queue_cnt == 0)) { 4904 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4905 } 4906 } 4907 break; 4908 /* 4909 * EY - nr_sack: If the received chunk is an 4910 * nr_sack chunk 4911 */ 4912 case SCTP_NR_SELECTIVE_ACK: 4913 { 4914 struct sctp_nr_sack_chunk *nr_sack; 4915 int abort_now = 0; 4916 uint32_t a_rwnd, cum_ack; 4917 uint16_t num_seg, num_nr_seg, num_dup; 4918 uint8_t flags; 4919 int offset_seg, offset_dup; 4920 4921 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4922 SCTP_STAT_INCR(sctps_recvsacks); 4923 if (stcb == NULL) { 4924 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4925 break; 4926 } 4927 if (stcb->asoc.nrsack_supported == 0) { 4928 goto unknown_chunk; 4929 } 4930 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4931 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4932 break; 4933 } 4934 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4935 /*- 4936 * If we have sent a shutdown-ack, we will pay no 4937 * attention to a sack sent in to us since 4938 * we don't care anymore. 4939 */ 4940 break; 4941 } 4942 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4943 flags = ch->chunk_flags; 4944 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4945 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4946 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4947 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4948 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4949 if (sizeof(struct sctp_nr_sack_chunk) + 4950 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4951 num_dup * sizeof(uint32_t) != chk_length) { 4952 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4953 break; 4954 } 4955 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4956 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4957 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4958 cum_ack, num_seg, a_rwnd); 4959 stcb->asoc.seen_a_sack_this_pkt = 1; 4960 if ((stcb->asoc.pr_sctp_cnt == 0) && 4961 (num_seg == 0) && (num_nr_seg == 0) && 4962 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4963 (stcb->asoc.saw_sack_with_frags == 0) && 4964 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4965 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4966 /* 4967 * We have a SIMPLE sack having no 4968 * prior segments and data on sent 4969 * queue to be acked. Use the faster 4970 * path sack processing. We also 4971 * allow window update sacks with no 4972 * missing segments to go this way 4973 * too. 4974 */ 4975 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4976 &abort_now, ecne_seen); 4977 } else { 4978 if (netp && *netp) 4979 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4980 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4981 cum_ack, a_rwnd, ecne_seen); 4982 } 4983 if (abort_now) { 4984 /* ABORT signal from sack processing */ 4985 *offset = length; 4986 return (NULL); 4987 } 4988 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4989 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4990 (stcb->asoc.stream_queue_cnt == 0)) { 4991 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4992 } 4993 } 4994 break; 4995 4996 case SCTP_HEARTBEAT_REQUEST: 4997 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4998 if ((stcb) && netp && *netp) { 4999 SCTP_STAT_INCR(sctps_recvheartbeat); 5000 sctp_send_heartbeat_ack(stcb, m, *offset, 5001 chk_length, *netp); 5002 5003 /* He's alive so give him credit */ 5004 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5005 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5006 stcb->asoc.overall_error_count, 5007 0, 5008 SCTP_FROM_SCTP_INPUT, 5009 __LINE__); 5010 } 5011 stcb->asoc.overall_error_count = 0; 5012 } 5013 break; 5014 case SCTP_HEARTBEAT_ACK: 5015 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5016 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5017 /* Its not ours */ 5018 *offset = length; 5019 if (locked_tcb) { 5020 SCTP_TCB_UNLOCK(locked_tcb); 5021 } 5022 return (NULL); 5023 } 5024 /* He's alive so give him credit */ 5025 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5026 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5027 stcb->asoc.overall_error_count, 5028 0, 5029 SCTP_FROM_SCTP_INPUT, 5030 __LINE__); 5031 } 5032 stcb->asoc.overall_error_count = 0; 5033 SCTP_STAT_INCR(sctps_recvheartbeatack); 5034 if (netp && *netp) 5035 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5036 stcb, *netp); 5037 break; 5038 case SCTP_ABORT_ASSOCIATION: 5039 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5040 (void *)stcb); 5041 if ((stcb) && netp && *netp) 5042 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5043 stcb, *netp); 5044 *offset = length; 5045 return (NULL); 5046 break; 5047 case SCTP_SHUTDOWN: 5048 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5049 (void *)stcb); 5050 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5051 *offset = length; 5052 if (locked_tcb) { 5053 SCTP_TCB_UNLOCK(locked_tcb); 5054 } 5055 return (NULL); 5056 } 5057 if (netp && *netp) { 5058 int abort_flag = 0; 5059 5060 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5061 stcb, *netp, &abort_flag); 5062 if (abort_flag) { 5063 *offset = length; 5064 return (NULL); 5065 } 5066 } 5067 break; 5068 case SCTP_SHUTDOWN_ACK: 5069 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5070 if ((stcb) && (netp) && (*netp)) 5071 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5072 *offset = length; 5073 return (NULL); 5074 break; 5075 5076 case SCTP_OPERATION_ERROR: 5077 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5078 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5079 *offset = length; 5080 return (NULL); 5081 } 5082 break; 5083 case SCTP_COOKIE_ECHO: 5084 SCTPDBG(SCTP_DEBUG_INPUT3, 5085 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5086 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5087 ; 5088 } else { 5089 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5090 /* We are not interested anymore */ 5091 abend: 5092 if (stcb) { 5093 SCTP_TCB_UNLOCK(stcb); 5094 } 5095 *offset = length; 5096 return (NULL); 5097 } 5098 } 5099 /* 5100 * First are we accepting? We do this again here 5101 * since it is possible that a previous endpoint WAS 5102 * listening responded to a INIT-ACK and then 5103 * closed. We opened and bound.. and are now no 5104 * longer listening. 5105 */ 5106 5107 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5108 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5109 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5110 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5111 sctp_abort_association(inp, stcb, m, iphlen, 5112 src, dst, sh, op_err, 5113 mflowtype, mflowid, 5114 vrf_id, port); 5115 } 5116 *offset = length; 5117 return (NULL); 5118 } else { 5119 struct mbuf *ret_buf; 5120 struct sctp_inpcb *linp; 5121 5122 if (stcb) { 5123 linp = NULL; 5124 } else { 5125 linp = inp; 5126 } 5127 5128 if (linp) { 5129 SCTP_ASOC_CREATE_LOCK(linp); 5130 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5131 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5132 SCTP_ASOC_CREATE_UNLOCK(linp); 5133 goto abend; 5134 } 5135 } 5136 if (netp) { 5137 ret_buf = 5138 sctp_handle_cookie_echo(m, iphlen, 5139 *offset, 5140 src, dst, 5141 sh, 5142 (struct sctp_cookie_echo_chunk *)ch, 5143 &inp, &stcb, netp, 5144 auth_skipped, 5145 auth_offset, 5146 auth_len, 5147 &locked_tcb, 5148 mflowtype, 5149 mflowid, 5150 vrf_id, 5151 port); 5152 } else { 5153 ret_buf = NULL; 5154 } 5155 if (linp) { 5156 SCTP_ASOC_CREATE_UNLOCK(linp); 5157 } 5158 if (ret_buf == NULL) { 5159 if (locked_tcb) { 5160 SCTP_TCB_UNLOCK(locked_tcb); 5161 } 5162 SCTPDBG(SCTP_DEBUG_INPUT3, 5163 "GAK, null buffer\n"); 5164 *offset = length; 5165 return (NULL); 5166 } 5167 /* if AUTH skipped, see if it verified... */ 5168 if (auth_skipped) { 5169 got_auth = 1; 5170 auth_skipped = 0; 5171 } 5172 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5173 /* 5174 * Restart the timer if we have 5175 * pending data 5176 */ 5177 struct sctp_tmit_chunk *chk; 5178 5179 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5180 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5181 } 5182 } 5183 break; 5184 case SCTP_COOKIE_ACK: 5185 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5186 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5187 if (locked_tcb) { 5188 SCTP_TCB_UNLOCK(locked_tcb); 5189 } 5190 return (NULL); 5191 } 5192 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5193 /* We are not interested anymore */ 5194 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5195 ; 5196 } else if (stcb) { 5197 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5198 so = SCTP_INP_SO(inp); 5199 atomic_add_int(&stcb->asoc.refcnt, 1); 5200 SCTP_TCB_UNLOCK(stcb); 5201 SCTP_SOCKET_LOCK(so, 1); 5202 SCTP_TCB_LOCK(stcb); 5203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5204 #endif 5205 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5207 SCTP_SOCKET_UNLOCK(so, 1); 5208 #endif 5209 *offset = length; 5210 return (NULL); 5211 } 5212 } 5213 /* He's alive so give him credit */ 5214 if ((stcb) && netp && *netp) { 5215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5216 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5217 stcb->asoc.overall_error_count, 5218 0, 5219 SCTP_FROM_SCTP_INPUT, 5220 __LINE__); 5221 } 5222 stcb->asoc.overall_error_count = 0; 5223 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5224 } 5225 break; 5226 case SCTP_ECN_ECHO: 5227 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5228 /* He's alive so give him credit */ 5229 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5230 /* Its not ours */ 5231 if (locked_tcb) { 5232 SCTP_TCB_UNLOCK(locked_tcb); 5233 } 5234 *offset = length; 5235 return (NULL); 5236 } 5237 if (stcb) { 5238 if (stcb->asoc.ecn_supported == 0) { 5239 goto unknown_chunk; 5240 } 5241 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5242 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5243 stcb->asoc.overall_error_count, 5244 0, 5245 SCTP_FROM_SCTP_INPUT, 5246 __LINE__); 5247 } 5248 stcb->asoc.overall_error_count = 0; 5249 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5250 stcb); 5251 ecne_seen = 1; 5252 } 5253 break; 5254 case SCTP_ECN_CWR: 5255 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5256 /* He's alive so give him credit */ 5257 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5258 /* Its not ours */ 5259 if (locked_tcb) { 5260 SCTP_TCB_UNLOCK(locked_tcb); 5261 } 5262 *offset = length; 5263 return (NULL); 5264 } 5265 if (stcb) { 5266 if (stcb->asoc.ecn_supported == 0) { 5267 goto unknown_chunk; 5268 } 5269 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5270 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5271 stcb->asoc.overall_error_count, 5272 0, 5273 SCTP_FROM_SCTP_INPUT, 5274 __LINE__); 5275 } 5276 stcb->asoc.overall_error_count = 0; 5277 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5278 } 5279 break; 5280 case SCTP_SHUTDOWN_COMPLETE: 5281 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5282 /* must be first and only chunk */ 5283 if ((num_chunks > 1) || 5284 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5285 *offset = length; 5286 if (locked_tcb) { 5287 SCTP_TCB_UNLOCK(locked_tcb); 5288 } 5289 return (NULL); 5290 } 5291 if ((stcb) && netp && *netp) { 5292 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5293 stcb, *netp); 5294 } 5295 *offset = length; 5296 return (NULL); 5297 break; 5298 case SCTP_ASCONF: 5299 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5300 /* He's alive so give him credit */ 5301 if (stcb) { 5302 if (stcb->asoc.asconf_supported == 0) { 5303 goto unknown_chunk; 5304 } 5305 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5306 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5307 stcb->asoc.overall_error_count, 5308 0, 5309 SCTP_FROM_SCTP_INPUT, 5310 __LINE__); 5311 } 5312 stcb->asoc.overall_error_count = 0; 5313 sctp_handle_asconf(m, *offset, src, 5314 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5315 asconf_cnt++; 5316 } 5317 break; 5318 case SCTP_ASCONF_ACK: 5319 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5320 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5321 /* Its not ours */ 5322 if (locked_tcb) { 5323 SCTP_TCB_UNLOCK(locked_tcb); 5324 } 5325 *offset = length; 5326 return (NULL); 5327 } 5328 if ((stcb) && netp && *netp) { 5329 if (stcb->asoc.asconf_supported == 0) { 5330 goto unknown_chunk; 5331 } 5332 /* He's alive so give him credit */ 5333 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5334 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5335 stcb->asoc.overall_error_count, 5336 0, 5337 SCTP_FROM_SCTP_INPUT, 5338 __LINE__); 5339 } 5340 stcb->asoc.overall_error_count = 0; 5341 sctp_handle_asconf_ack(m, *offset, 5342 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5343 if (abort_no_unlock) 5344 return (NULL); 5345 } 5346 break; 5347 case SCTP_FORWARD_CUM_TSN: 5348 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5349 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5350 /* Its not ours */ 5351 if (locked_tcb) { 5352 SCTP_TCB_UNLOCK(locked_tcb); 5353 } 5354 *offset = length; 5355 return (NULL); 5356 } 5357 /* He's alive so give him credit */ 5358 if (stcb) { 5359 int abort_flag = 0; 5360 5361 if (stcb->asoc.prsctp_supported == 0) { 5362 goto unknown_chunk; 5363 } 5364 stcb->asoc.overall_error_count = 0; 5365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5367 stcb->asoc.overall_error_count, 5368 0, 5369 SCTP_FROM_SCTP_INPUT, 5370 __LINE__); 5371 } 5372 *fwd_tsn_seen = 1; 5373 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5374 /* We are not interested anymore */ 5375 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5376 so = SCTP_INP_SO(inp); 5377 atomic_add_int(&stcb->asoc.refcnt, 1); 5378 SCTP_TCB_UNLOCK(stcb); 5379 SCTP_SOCKET_LOCK(so, 1); 5380 SCTP_TCB_LOCK(stcb); 5381 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5382 #endif 5383 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5384 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5385 SCTP_SOCKET_UNLOCK(so, 1); 5386 #endif 5387 *offset = length; 5388 return (NULL); 5389 } 5390 sctp_handle_forward_tsn(stcb, 5391 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5392 if (abort_flag) { 5393 *offset = length; 5394 return (NULL); 5395 } else { 5396 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5397 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5398 stcb->asoc.overall_error_count, 5399 0, 5400 SCTP_FROM_SCTP_INPUT, 5401 __LINE__); 5402 } 5403 stcb->asoc.overall_error_count = 0; 5404 } 5405 5406 } 5407 break; 5408 case SCTP_STREAM_RESET: 5409 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5410 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5411 /* Its not ours */ 5412 if (locked_tcb) { 5413 SCTP_TCB_UNLOCK(locked_tcb); 5414 } 5415 *offset = length; 5416 return (NULL); 5417 } 5418 if (stcb->asoc.reconfig_supported == 0) { 5419 goto unknown_chunk; 5420 } 5421 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5422 /* stop processing */ 5423 *offset = length; 5424 return (NULL); 5425 } 5426 break; 5427 case SCTP_PACKET_DROPPED: 5428 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5429 /* re-get it all please */ 5430 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5431 /* Its not ours */ 5432 if (locked_tcb) { 5433 SCTP_TCB_UNLOCK(locked_tcb); 5434 } 5435 *offset = length; 5436 return (NULL); 5437 } 5438 if (ch && (stcb) && netp && (*netp)) { 5439 if (stcb->asoc.pktdrop_supported == 0) { 5440 goto unknown_chunk; 5441 } 5442 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5443 stcb, *netp, 5444 min(chk_length, (sizeof(chunk_buf) - 4))); 5445 5446 } 5447 break; 5448 case SCTP_AUTHENTICATION: 5449 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5450 if (stcb == NULL) { 5451 /* save the first AUTH for later processing */ 5452 if (auth_skipped == 0) { 5453 auth_offset = *offset; 5454 auth_len = chk_length; 5455 auth_skipped = 1; 5456 } 5457 /* skip this chunk (temporarily) */ 5458 goto next_chunk; 5459 } 5460 if (stcb->asoc.auth_supported == 0) { 5461 goto unknown_chunk; 5462 } 5463 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5464 (chk_length > (sizeof(struct sctp_auth_chunk) + 5465 SCTP_AUTH_DIGEST_LEN_MAX))) { 5466 /* Its not ours */ 5467 if (locked_tcb) { 5468 SCTP_TCB_UNLOCK(locked_tcb); 5469 } 5470 *offset = length; 5471 return (NULL); 5472 } 5473 if (got_auth == 1) { 5474 /* skip this chunk... it's already auth'd */ 5475 goto next_chunk; 5476 } 5477 got_auth = 1; 5478 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5479 m, *offset)) { 5480 /* auth HMAC failed so dump the packet */ 5481 *offset = length; 5482 return (stcb); 5483 } else { 5484 /* remaining chunks are HMAC checked */ 5485 stcb->asoc.authenticated = 1; 5486 } 5487 break; 5488 5489 default: 5490 unknown_chunk: 5491 /* it's an unknown chunk! */ 5492 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5493 struct mbuf *mm; 5494 struct sctp_paramhdr *phd; 5495 int len; 5496 5497 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5498 0, M_NOWAIT, 1, MT_DATA); 5499 if (mm) { 5500 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5501 phd = mtod(mm, struct sctp_paramhdr *); 5502 /* 5503 * We cheat and use param type since 5504 * we did not bother to define a 5505 * error cause struct. They are the 5506 * same basic format with different 5507 * names. 5508 */ 5509 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5510 phd->param_length = htons(len + sizeof(*phd)); 5511 SCTP_BUF_LEN(mm) = sizeof(*phd); 5512 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5513 if (SCTP_BUF_NEXT(mm)) { 5514 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5515 sctp_m_freem(mm); 5516 } else { 5517 #ifdef SCTP_MBUF_LOGGING 5518 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5519 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5520 } 5521 #endif 5522 sctp_queue_op_err(stcb, mm); 5523 } 5524 } else { 5525 sctp_m_freem(mm); 5526 } 5527 } 5528 } 5529 if ((ch->chunk_type & 0x80) == 0) { 5530 /* discard this packet */ 5531 *offset = length; 5532 return (stcb); 5533 } /* else skip this bad chunk and continue... */ 5534 break; 5535 } /* switch (ch->chunk_type) */ 5536 5537 5538 next_chunk: 5539 /* get the next chunk */ 5540 *offset += SCTP_SIZE32(chk_length); 5541 if (*offset >= length) { 5542 /* no more data left in the mbuf chain */ 5543 break; 5544 } 5545 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5546 sizeof(struct sctp_chunkhdr), chunk_buf); 5547 if (ch == NULL) { 5548 if (locked_tcb) { 5549 SCTP_TCB_UNLOCK(locked_tcb); 5550 } 5551 *offset = length; 5552 return (NULL); 5553 } 5554 } /* while */ 5555 5556 if (asconf_cnt > 0 && stcb != NULL) { 5557 sctp_send_asconf_ack(stcb); 5558 } 5559 return (stcb); 5560 } 5561 5562 5563 #ifdef INVARIANTS 5564 #ifdef __GNUC__ 5565 __attribute__((noinline)) 5566 #endif 5567 void 5568 sctp_validate_no_locks(struct sctp_inpcb *inp) 5569 { 5570 struct sctp_tcb *lstcb; 5571 5572 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5573 if (mtx_owned(&lstcb->tcb_mtx)) { 5574 panic("Own lock on stcb at return from input"); 5575 } 5576 } 5577 if (mtx_owned(&inp->inp_create_mtx)) { 5578 panic("Own create lock on inp"); 5579 } 5580 if (mtx_owned(&inp->inp_mtx)) { 5581 panic("Own inp lock on inp"); 5582 } 5583 } 5584 5585 #endif 5586 5587 /* 5588 * common input chunk processing (v4 and v6) 5589 */ 5590 void 5591 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5592 struct sockaddr *src, struct sockaddr *dst, 5593 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5594 #if !defined(SCTP_WITH_NO_CSUM) 5595 uint8_t compute_crc, 5596 #endif 5597 uint8_t ecn_bits, 5598 uint8_t mflowtype, uint32_t mflowid, 5599 uint32_t vrf_id, uint16_t port) 5600 { 5601 uint32_t high_tsn; 5602 int fwd_tsn_seen = 0, data_processed = 0; 5603 struct mbuf *m = *mm, *op_err; 5604 char msg[SCTP_DIAG_INFO_LEN]; 5605 int un_sent; 5606 int cnt_ctrl_ready = 0; 5607 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5608 struct sctp_tcb *stcb = NULL; 5609 struct sctp_nets *net = NULL; 5610 5611 SCTP_STAT_INCR(sctps_recvdatagrams); 5612 #ifdef SCTP_AUDITING_ENABLED 5613 sctp_audit_log(0xE0, 1); 5614 sctp_auditing(0, inp, stcb, net); 5615 #endif 5616 #if !defined(SCTP_WITH_NO_CSUM) 5617 if (compute_crc != 0) { 5618 uint32_t check, calc_check; 5619 5620 check = sh->checksum; 5621 sh->checksum = 0; 5622 calc_check = sctp_calculate_cksum(m, iphlen); 5623 sh->checksum = check; 5624 if (calc_check != check) { 5625 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5626 calc_check, check, (void *)m, length, iphlen); 5627 stcb = sctp_findassociation_addr(m, offset, src, dst, 5628 sh, ch, &inp, &net, vrf_id); 5629 #if defined(INET) || defined(INET6) 5630 if ((net != NULL) && (port != 0)) { 5631 if (net->port == 0) { 5632 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5633 } 5634 net->port = port; 5635 } 5636 #endif 5637 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5638 net->flowtype = mflowtype; 5639 } 5640 if ((inp != NULL) && (stcb != NULL)) { 5641 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5642 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5643 } else if ((inp != NULL) && (stcb == NULL)) { 5644 inp_decr = inp; 5645 } 5646 SCTP_STAT_INCR(sctps_badsum); 5647 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5648 goto out; 5649 } 5650 } 5651 #endif 5652 /* Destination port of 0 is illegal, based on RFC4960. */ 5653 if (sh->dest_port == 0) { 5654 SCTP_STAT_INCR(sctps_hdrops); 5655 goto out; 5656 } 5657 stcb = sctp_findassociation_addr(m, offset, src, dst, 5658 sh, ch, &inp, &net, vrf_id); 5659 #if defined(INET) || defined(INET6) 5660 if ((net != NULL) && (port != 0)) { 5661 if (net->port == 0) { 5662 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5663 } 5664 net->port = port; 5665 } 5666 #endif 5667 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5668 net->flowtype = mflowtype; 5669 } 5670 if (inp == NULL) { 5671 SCTP_STAT_INCR(sctps_noport); 5672 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5673 goto out; 5674 } 5675 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5676 sctp_send_shutdown_complete2(src, dst, sh, 5677 mflowtype, mflowid, 5678 vrf_id, port); 5679 goto out; 5680 } 5681 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5682 goto out; 5683 } 5684 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5685 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5686 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5687 (ch->chunk_type != SCTP_INIT))) { 5688 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5689 "Out of the blue"); 5690 sctp_send_abort(m, iphlen, src, dst, 5691 sh, 0, op_err, 5692 mflowtype, mflowid, 5693 vrf_id, port); 5694 } 5695 } 5696 goto out; 5697 } else if (stcb == NULL) { 5698 inp_decr = inp; 5699 } 5700 #ifdef IPSEC 5701 /*- 5702 * I very much doubt any of the IPSEC stuff will work but I have no 5703 * idea, so I will leave it in place. 5704 */ 5705 if (inp != NULL) { 5706 switch (dst->sa_family) { 5707 #ifdef INET 5708 case AF_INET: 5709 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5710 SCTP_STAT_INCR(sctps_hdrops); 5711 goto out; 5712 } 5713 break; 5714 #endif 5715 #ifdef INET6 5716 case AF_INET6: 5717 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5718 SCTP_STAT_INCR(sctps_hdrops); 5719 goto out; 5720 } 5721 break; 5722 #endif 5723 default: 5724 break; 5725 } 5726 } 5727 #endif 5728 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5729 (void *)m, iphlen, offset, length, (void *)stcb); 5730 if (stcb) { 5731 /* always clear this before beginning a packet */ 5732 stcb->asoc.authenticated = 0; 5733 stcb->asoc.seen_a_sack_this_pkt = 0; 5734 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5735 (void *)stcb, stcb->asoc.state); 5736 5737 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5738 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5739 /*- 5740 * If we hit here, we had a ref count 5741 * up when the assoc was aborted and the 5742 * timer is clearing out the assoc, we should 5743 * NOT respond to any packet.. its OOTB. 5744 */ 5745 SCTP_TCB_UNLOCK(stcb); 5746 stcb = NULL; 5747 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5748 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5749 msg); 5750 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5751 mflowtype, mflowid, 5752 vrf_id, port); 5753 goto out; 5754 } 5755 } 5756 if (IS_SCTP_CONTROL(ch)) { 5757 /* process the control portion of the SCTP packet */ 5758 /* sa_ignore NO_NULL_CHK */ 5759 stcb = sctp_process_control(m, iphlen, &offset, length, 5760 src, dst, sh, ch, 5761 inp, stcb, &net, &fwd_tsn_seen, 5762 mflowtype, mflowid, 5763 vrf_id, port); 5764 if (stcb) { 5765 /* 5766 * This covers us if the cookie-echo was there and 5767 * it changes our INP. 5768 */ 5769 inp = stcb->sctp_ep; 5770 #if defined(INET) || defined(INET6) 5771 if ((net) && (port)) { 5772 if (net->port == 0) { 5773 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5774 } 5775 net->port = port; 5776 } 5777 #endif 5778 } 5779 } else { 5780 /* 5781 * no control chunks, so pre-process DATA chunks (these 5782 * checks are taken care of by control processing) 5783 */ 5784 5785 /* 5786 * if DATA only packet, and auth is required, then punt... 5787 * can't have authenticated without any AUTH (control) 5788 * chunks 5789 */ 5790 if ((stcb != NULL) && 5791 (stcb->asoc.auth_supported == 1) && 5792 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5793 /* "silently" ignore */ 5794 SCTP_STAT_INCR(sctps_recvauthmissing); 5795 goto out; 5796 } 5797 if (stcb == NULL) { 5798 /* out of the blue DATA chunk */ 5799 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5800 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5801 msg); 5802 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5803 mflowtype, mflowid, 5804 vrf_id, port); 5805 goto out; 5806 } 5807 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5808 /* v_tag mismatch! */ 5809 SCTP_STAT_INCR(sctps_badvtag); 5810 goto out; 5811 } 5812 } 5813 5814 if (stcb == NULL) { 5815 /* 5816 * no valid TCB for this packet, or we found it's a bad 5817 * packet while processing control, or we're done with this 5818 * packet (done or skip rest of data), so we drop it... 5819 */ 5820 goto out; 5821 } 5822 /* 5823 * DATA chunk processing 5824 */ 5825 /* plow through the data chunks while length > offset */ 5826 5827 /* 5828 * Rest should be DATA only. Check authentication state if AUTH for 5829 * DATA is required. 5830 */ 5831 if ((length > offset) && 5832 (stcb != NULL) && 5833 (stcb->asoc.auth_supported == 1) && 5834 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5835 !stcb->asoc.authenticated) { 5836 /* "silently" ignore */ 5837 SCTP_STAT_INCR(sctps_recvauthmissing); 5838 SCTPDBG(SCTP_DEBUG_AUTH1, 5839 "Data chunk requires AUTH, skipped\n"); 5840 goto trigger_send; 5841 } 5842 if (length > offset) { 5843 int retval; 5844 5845 /* 5846 * First check to make sure our state is correct. We would 5847 * not get here unless we really did have a tag, so we don't 5848 * abort if this happens, just dump the chunk silently. 5849 */ 5850 switch (SCTP_GET_STATE(&stcb->asoc)) { 5851 case SCTP_STATE_COOKIE_ECHOED: 5852 /* 5853 * we consider data with valid tags in this state 5854 * shows us the cookie-ack was lost. Imply it was 5855 * there. 5856 */ 5857 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5858 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5859 stcb->asoc.overall_error_count, 5860 0, 5861 SCTP_FROM_SCTP_INPUT, 5862 __LINE__); 5863 } 5864 stcb->asoc.overall_error_count = 0; 5865 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5866 break; 5867 case SCTP_STATE_COOKIE_WAIT: 5868 /* 5869 * We consider OOTB any data sent during asoc setup. 5870 */ 5871 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5872 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5873 msg); 5874 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5875 mflowtype, mflowid, 5876 vrf_id, port); 5877 goto out; 5878 /* sa_ignore NOTREACHED */ 5879 break; 5880 case SCTP_STATE_EMPTY: /* should not happen */ 5881 case SCTP_STATE_INUSE: /* should not happen */ 5882 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5883 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5884 default: 5885 goto out; 5886 /* sa_ignore NOTREACHED */ 5887 break; 5888 case SCTP_STATE_OPEN: 5889 case SCTP_STATE_SHUTDOWN_SENT: 5890 break; 5891 } 5892 /* plow through the data chunks while length > offset */ 5893 retval = sctp_process_data(mm, iphlen, &offset, length, 5894 src, dst, sh, 5895 inp, stcb, net, &high_tsn, 5896 mflowtype, mflowid, 5897 vrf_id, port); 5898 if (retval == 2) { 5899 /* 5900 * The association aborted, NO UNLOCK needed since 5901 * the association is destroyed. 5902 */ 5903 stcb = NULL; 5904 goto out; 5905 } 5906 data_processed = 1; 5907 /* 5908 * Anything important needs to have been m_copy'ed in 5909 * process_data 5910 */ 5911 } 5912 /* take care of ecn */ 5913 if ((data_processed == 1) && 5914 (stcb->asoc.ecn_supported == 1) && 5915 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5916 /* Yep, we need to add a ECNE */ 5917 sctp_send_ecn_echo(stcb, net, high_tsn); 5918 } 5919 if ((data_processed == 0) && (fwd_tsn_seen)) { 5920 int was_a_gap; 5921 uint32_t highest_tsn; 5922 5923 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5924 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5925 } else { 5926 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5927 } 5928 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5929 stcb->asoc.send_sack = 1; 5930 sctp_sack_check(stcb, was_a_gap); 5931 } else if (fwd_tsn_seen) { 5932 stcb->asoc.send_sack = 1; 5933 } 5934 /* trigger send of any chunks in queue... */ 5935 trigger_send: 5936 #ifdef SCTP_AUDITING_ENABLED 5937 sctp_audit_log(0xE0, 2); 5938 sctp_auditing(1, inp, stcb, net); 5939 #endif 5940 SCTPDBG(SCTP_DEBUG_INPUT1, 5941 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5942 stcb->asoc.peers_rwnd, 5943 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5944 stcb->asoc.total_flight); 5945 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5946 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5947 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5948 } 5949 if (cnt_ctrl_ready || 5950 ((un_sent) && 5951 (stcb->asoc.peers_rwnd > 0 || 5952 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5953 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5954 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5955 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5956 } 5957 #ifdef SCTP_AUDITING_ENABLED 5958 sctp_audit_log(0xE0, 3); 5959 sctp_auditing(2, inp, stcb, net); 5960 #endif 5961 out: 5962 if (stcb != NULL) { 5963 SCTP_TCB_UNLOCK(stcb); 5964 } 5965 if (inp_decr != NULL) { 5966 /* reduce ref-count */ 5967 SCTP_INP_WLOCK(inp_decr); 5968 SCTP_INP_DECR_REF(inp_decr); 5969 SCTP_INP_WUNLOCK(inp_decr); 5970 } 5971 #ifdef INVARIANTS 5972 if (inp != NULL) { 5973 sctp_validate_no_locks(inp); 5974 } 5975 #endif 5976 return; 5977 } 5978 5979 #ifdef INET 5980 void 5981 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5982 { 5983 struct mbuf *m; 5984 int iphlen; 5985 uint32_t vrf_id = 0; 5986 uint8_t ecn_bits; 5987 struct sockaddr_in src, dst; 5988 struct ip *ip; 5989 struct sctphdr *sh; 5990 struct sctp_chunkhdr *ch; 5991 int length, offset; 5992 5993 #if !defined(SCTP_WITH_NO_CSUM) 5994 uint8_t compute_crc; 5995 5996 #endif 5997 uint32_t mflowid; 5998 uint8_t mflowtype; 5999 6000 iphlen = off; 6001 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6002 SCTP_RELEASE_PKT(i_pak); 6003 return; 6004 } 6005 m = SCTP_HEADER_TO_CHAIN(i_pak); 6006 #ifdef SCTP_MBUF_LOGGING 6007 /* Log in any input mbufs */ 6008 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6009 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6010 } 6011 #endif 6012 #ifdef SCTP_PACKET_LOGGING 6013 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6014 sctp_packet_log(m); 6015 } 6016 #endif 6017 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6018 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6019 m->m_pkthdr.len, 6020 if_name(m->m_pkthdr.rcvif), 6021 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6022 mflowid = m->m_pkthdr.flowid; 6023 mflowtype = M_HASHTYPE_GET(m); 6024 SCTP_STAT_INCR(sctps_recvpackets); 6025 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6026 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6027 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6028 if (SCTP_BUF_LEN(m) < offset) { 6029 if ((m = m_pullup(m, offset)) == NULL) { 6030 SCTP_STAT_INCR(sctps_hdrops); 6031 return; 6032 } 6033 } 6034 ip = mtod(m, struct ip *); 6035 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6036 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6037 offset -= sizeof(struct sctp_chunkhdr); 6038 memset(&src, 0, sizeof(struct sockaddr_in)); 6039 src.sin_family = AF_INET; 6040 src.sin_len = sizeof(struct sockaddr_in); 6041 src.sin_port = sh->src_port; 6042 src.sin_addr = ip->ip_src; 6043 memset(&dst, 0, sizeof(struct sockaddr_in)); 6044 dst.sin_family = AF_INET; 6045 dst.sin_len = sizeof(struct sockaddr_in); 6046 dst.sin_port = sh->dest_port; 6047 dst.sin_addr = ip->ip_dst; 6048 length = ntohs(ip->ip_len); 6049 /* Validate mbuf chain length with IP payload length. */ 6050 if (SCTP_HEADER_LEN(m) != length) { 6051 SCTPDBG(SCTP_DEBUG_INPUT1, 6052 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6053 SCTP_STAT_INCR(sctps_hdrops); 6054 goto out; 6055 } 6056 /* SCTP does not allow broadcasts or multicasts */ 6057 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6058 goto out; 6059 } 6060 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6061 goto out; 6062 } 6063 ecn_bits = ip->ip_tos; 6064 #if defined(SCTP_WITH_NO_CSUM) 6065 SCTP_STAT_INCR(sctps_recvnocrc); 6066 #else 6067 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6068 SCTP_STAT_INCR(sctps_recvhwcrc); 6069 compute_crc = 0; 6070 } else { 6071 SCTP_STAT_INCR(sctps_recvswcrc); 6072 compute_crc = 1; 6073 } 6074 #endif 6075 sctp_common_input_processing(&m, iphlen, offset, length, 6076 (struct sockaddr *)&src, 6077 (struct sockaddr *)&dst, 6078 sh, ch, 6079 #if !defined(SCTP_WITH_NO_CSUM) 6080 compute_crc, 6081 #endif 6082 ecn_bits, 6083 mflowtype, mflowid, 6084 vrf_id, port); 6085 out: 6086 if (m) { 6087 sctp_m_freem(m); 6088 } 6089 return; 6090 } 6091 6092 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6093 extern int *sctp_cpuarry; 6094 6095 #endif 6096 6097 int 6098 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6099 { 6100 struct mbuf *m; 6101 int off; 6102 6103 m = *mp; 6104 off = *offp; 6105 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6106 if (mp_ncpus > 1) { 6107 struct ip *ip; 6108 struct sctphdr *sh; 6109 int offset; 6110 int cpu_to_use; 6111 uint32_t flowid, tag; 6112 6113 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6114 flowid = m->m_pkthdr.flowid; 6115 } else { 6116 /* 6117 * No flow id built by lower layers fix it so we 6118 * create one. 6119 */ 6120 offset = off + sizeof(struct sctphdr); 6121 if (SCTP_BUF_LEN(m) < offset) { 6122 if ((m = m_pullup(m, offset)) == NULL) { 6123 SCTP_STAT_INCR(sctps_hdrops); 6124 return (IPPROTO_DONE); 6125 } 6126 } 6127 ip = mtod(m, struct ip *); 6128 sh = (struct sctphdr *)((caddr_t)ip + off); 6129 tag = htonl(sh->v_tag); 6130 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6131 m->m_pkthdr.flowid = flowid; 6132 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6133 } 6134 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6135 sctp_queue_to_mcore(m, off, cpu_to_use); 6136 return (IPPROTO_DONE); 6137 } 6138 #endif 6139 sctp_input_with_port(m, off, 0); 6140 return (IPPROTO_DONE); 6141 } 6142 6143 #endif 6144