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->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2767 inp->ecn_supported = (*inp_p)->ecn_supported; 2768 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2769 inp->auth_supported = (*inp_p)->auth_supported; 2770 inp->asconf_supported = (*inp_p)->asconf_supported; 2771 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2772 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2773 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2774 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2775 inp->sctp_context = (*inp_p)->sctp_context; 2776 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2777 inp->inp_starting_point_for_iterator = NULL; 2778 /* 2779 * copy in the authentication parameters from the 2780 * original endpoint 2781 */ 2782 if (inp->sctp_ep.local_hmacs) 2783 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2784 inp->sctp_ep.local_hmacs = 2785 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2786 if (inp->sctp_ep.local_auth_chunks) 2787 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2788 inp->sctp_ep.local_auth_chunks = 2789 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2790 2791 /* 2792 * Now we must move it from one hash table to 2793 * another and get the tcb in the right place. 2794 */ 2795 2796 /* 2797 * This is where the one-2-one socket is put into 2798 * the accept state waiting for the accept! 2799 */ 2800 if (*stcb) { 2801 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2802 } 2803 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2804 2805 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2806 SCTP_TCB_UNLOCK((*stcb)); 2807 2808 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2809 0); 2810 SCTP_TCB_LOCK((*stcb)); 2811 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2812 2813 2814 /* 2815 * now we must check to see if we were aborted while 2816 * the move was going on and the lock/unlock 2817 * happened. 2818 */ 2819 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2820 /* 2821 * yep it was, we leave the assoc attached 2822 * to the socket since the sctp_inpcb_free() 2823 * call will send an abort for us. 2824 */ 2825 SCTP_INP_DECR_REF(inp); 2826 return (NULL); 2827 } 2828 SCTP_INP_DECR_REF(inp); 2829 /* Switch over to the new guy */ 2830 *inp_p = inp; 2831 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2832 if (send_int_conf) { 2833 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2834 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2835 } 2836 /* 2837 * Pull it from the incomplete queue and wake the 2838 * guy 2839 */ 2840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2841 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2842 SCTP_TCB_UNLOCK((*stcb)); 2843 SCTP_SOCKET_LOCK(so, 1); 2844 #endif 2845 soisconnected(so); 2846 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2847 SCTP_TCB_LOCK((*stcb)); 2848 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2849 SCTP_SOCKET_UNLOCK(so, 1); 2850 #endif 2851 return (m); 2852 } 2853 } 2854 if (notification) { 2855 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2856 } 2857 if (send_int_conf) { 2858 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2859 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2860 } 2861 return (m); 2862 } 2863 2864 static void 2865 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2866 struct sctp_tcb *stcb, struct sctp_nets *net) 2867 { 2868 /* cp must not be used, others call this without a c-ack :-) */ 2869 struct sctp_association *asoc; 2870 2871 SCTPDBG(SCTP_DEBUG_INPUT2, 2872 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2873 if ((stcb == NULL) || (net == NULL)) { 2874 return; 2875 } 2876 asoc = &stcb->asoc; 2877 2878 sctp_stop_all_cookie_timers(stcb); 2879 /* process according to association state */ 2880 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2881 /* state change only needed when I am in right state */ 2882 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2883 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2884 sctp_start_net_timers(stcb); 2885 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2887 stcb->sctp_ep, stcb, asoc->primary_destination); 2888 2889 } 2890 /* update RTO */ 2891 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2892 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2893 if (asoc->overall_error_count == 0) { 2894 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2895 &asoc->time_entered, sctp_align_safe_nocopy, 2896 SCTP_RTT_FROM_NON_DATA); 2897 } 2898 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2899 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2900 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2901 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2902 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2903 struct socket *so; 2904 2905 #endif 2906 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2907 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2908 so = SCTP_INP_SO(stcb->sctp_ep); 2909 atomic_add_int(&stcb->asoc.refcnt, 1); 2910 SCTP_TCB_UNLOCK(stcb); 2911 SCTP_SOCKET_LOCK(so, 1); 2912 SCTP_TCB_LOCK(stcb); 2913 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2914 #endif 2915 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2916 soisconnected(stcb->sctp_socket); 2917 } 2918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2919 SCTP_SOCKET_UNLOCK(so, 1); 2920 #endif 2921 } 2922 /* 2923 * since we did not send a HB make sure we don't double 2924 * things 2925 */ 2926 net->hb_responded = 1; 2927 2928 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2929 /* 2930 * We don't need to do the asconf thing, nor hb or 2931 * autoclose if the socket is closed. 2932 */ 2933 goto closed_socket; 2934 } 2935 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2936 stcb, net); 2937 2938 2939 if (stcb->asoc.sctp_autoclose_ticks && 2940 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2941 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2942 stcb->sctp_ep, stcb, NULL); 2943 } 2944 /* 2945 * send ASCONF if parameters are pending and ASCONFs are 2946 * allowed (eg. addresses changed when init/cookie echo were 2947 * in flight) 2948 */ 2949 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2950 (stcb->asoc.asconf_supported == 1) && 2951 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2952 #ifdef SCTP_TIMER_BASED_ASCONF 2953 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2954 stcb->sctp_ep, stcb, 2955 stcb->asoc.primary_destination); 2956 #else 2957 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2958 SCTP_ADDR_NOT_LOCKED); 2959 #endif 2960 } 2961 } 2962 closed_socket: 2963 /* Toss the cookie if I can */ 2964 sctp_toss_old_cookies(stcb, asoc); 2965 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2966 /* Restart the timer if we have pending data */ 2967 struct sctp_tmit_chunk *chk; 2968 2969 chk = TAILQ_FIRST(&asoc->sent_queue); 2970 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2971 } 2972 } 2973 2974 static void 2975 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2976 struct sctp_tcb *stcb) 2977 { 2978 struct sctp_nets *net; 2979 struct sctp_tmit_chunk *lchk; 2980 struct sctp_ecne_chunk bkup; 2981 uint8_t override_bit; 2982 uint32_t tsn, window_data_tsn; 2983 int len; 2984 unsigned int pkt_cnt; 2985 2986 len = ntohs(cp->ch.chunk_length); 2987 if ((len != sizeof(struct sctp_ecne_chunk)) && 2988 (len != sizeof(struct old_sctp_ecne_chunk))) { 2989 return; 2990 } 2991 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2992 /* Its the old format */ 2993 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2994 bkup.num_pkts_since_cwr = htonl(1); 2995 cp = &bkup; 2996 } 2997 SCTP_STAT_INCR(sctps_recvecne); 2998 tsn = ntohl(cp->tsn); 2999 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3000 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3001 if (lchk == NULL) { 3002 window_data_tsn = stcb->asoc.sending_seq - 1; 3003 } else { 3004 window_data_tsn = lchk->rec.data.TSN_seq; 3005 } 3006 3007 /* Find where it was sent to if possible. */ 3008 net = NULL; 3009 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3010 if (lchk->rec.data.TSN_seq == tsn) { 3011 net = lchk->whoTo; 3012 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3013 break; 3014 } 3015 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3016 break; 3017 } 3018 } 3019 if (net == NULL) { 3020 /* 3021 * What to do. A previous send of a CWR was possibly lost. 3022 * See how old it is, we may have it marked on the actual 3023 * net. 3024 */ 3025 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3026 if (tsn == net->last_cwr_tsn) { 3027 /* Found him, send it off */ 3028 break; 3029 } 3030 } 3031 if (net == NULL) { 3032 /* 3033 * If we reach here, we need to send a special CWR 3034 * that says hey, we did this a long time ago and 3035 * you lost the response. 3036 */ 3037 net = TAILQ_FIRST(&stcb->asoc.nets); 3038 if (net == NULL) { 3039 /* TSNH */ 3040 return; 3041 } 3042 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3043 } else { 3044 override_bit = 0; 3045 } 3046 } else { 3047 override_bit = 0; 3048 } 3049 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3050 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3051 /* 3052 * JRS - Use the congestion control given in the pluggable 3053 * CC module 3054 */ 3055 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3056 /* 3057 * We reduce once every RTT. So we will only lower cwnd at 3058 * the next sending seq i.e. the window_data_tsn 3059 */ 3060 net->cwr_window_tsn = window_data_tsn; 3061 net->ecn_ce_pkt_cnt += pkt_cnt; 3062 net->lost_cnt = pkt_cnt; 3063 net->last_cwr_tsn = tsn; 3064 } else { 3065 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3066 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3067 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3068 /* 3069 * Another loss in the same window update how many 3070 * marks/packets lost we have had. 3071 */ 3072 int cnt = 1; 3073 3074 if (pkt_cnt > net->lost_cnt) { 3075 /* Should be the case */ 3076 cnt = (pkt_cnt - net->lost_cnt); 3077 net->ecn_ce_pkt_cnt += cnt; 3078 } 3079 net->lost_cnt = pkt_cnt; 3080 net->last_cwr_tsn = tsn; 3081 /* 3082 * Most CC functions will ignore this call, since we 3083 * are in-window yet of the initial CE the peer saw. 3084 */ 3085 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3086 } 3087 } 3088 /* 3089 * We always send a CWR this way if our previous one was lost our 3090 * peer will get an update, or if it is not time again to reduce we 3091 * still get the cwr to the peer. Note we set the override when we 3092 * could not find the TSN on the chunk or the destination network. 3093 */ 3094 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3095 } 3096 3097 static void 3098 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3099 { 3100 /* 3101 * Here we get a CWR from the peer. We must look in the outqueue and 3102 * make sure that we have a covered ECNE in the control chunk part. 3103 * If so remove it. 3104 */ 3105 struct sctp_tmit_chunk *chk; 3106 struct sctp_ecne_chunk *ecne; 3107 int override; 3108 uint32_t cwr_tsn; 3109 3110 cwr_tsn = ntohl(cp->tsn); 3111 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3112 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3113 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3114 continue; 3115 } 3116 if ((override == 0) && (chk->whoTo != net)) { 3117 /* Must be from the right src unless override is set */ 3118 continue; 3119 } 3120 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3121 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3122 /* this covers this ECNE, we can remove it */ 3123 stcb->asoc.ecn_echo_cnt_onq--; 3124 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3125 sctp_next); 3126 sctp_m_freem(chk->data); 3127 chk->data = NULL; 3128 stcb->asoc.ctrl_queue_cnt--; 3129 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3130 if (override == 0) { 3131 break; 3132 } 3133 } 3134 } 3135 } 3136 3137 static void 3138 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3139 struct sctp_tcb *stcb, struct sctp_nets *net) 3140 { 3141 struct sctp_association *asoc; 3142 3143 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3144 struct socket *so; 3145 3146 #endif 3147 3148 SCTPDBG(SCTP_DEBUG_INPUT2, 3149 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3150 if (stcb == NULL) 3151 return; 3152 3153 asoc = &stcb->asoc; 3154 /* process according to association state */ 3155 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3156 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3157 SCTPDBG(SCTP_DEBUG_INPUT2, 3158 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3159 SCTP_TCB_UNLOCK(stcb); 3160 return; 3161 } 3162 /* notify upper layer protocol */ 3163 if (stcb->sctp_socket) { 3164 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3165 } 3166 #ifdef INVARIANTS 3167 if (!TAILQ_EMPTY(&asoc->send_queue) || 3168 !TAILQ_EMPTY(&asoc->sent_queue) || 3169 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3170 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3171 } 3172 #endif 3173 /* stop the timer */ 3174 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3175 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3176 /* free the TCB */ 3177 SCTPDBG(SCTP_DEBUG_INPUT2, 3178 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3180 so = SCTP_INP_SO(stcb->sctp_ep); 3181 atomic_add_int(&stcb->asoc.refcnt, 1); 3182 SCTP_TCB_UNLOCK(stcb); 3183 SCTP_SOCKET_LOCK(so, 1); 3184 SCTP_TCB_LOCK(stcb); 3185 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3186 #endif 3187 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3188 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3189 SCTP_SOCKET_UNLOCK(so, 1); 3190 #endif 3191 return; 3192 } 3193 3194 static int 3195 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3196 struct sctp_nets *net, uint8_t flg) 3197 { 3198 switch (desc->chunk_type) { 3199 case SCTP_DATA: 3200 /* find the tsn to resend (possibly */ 3201 { 3202 uint32_t tsn; 3203 struct sctp_tmit_chunk *tp1; 3204 3205 tsn = ntohl(desc->tsn_ifany); 3206 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3207 if (tp1->rec.data.TSN_seq == tsn) { 3208 /* found it */ 3209 break; 3210 } 3211 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3212 /* not found */ 3213 tp1 = NULL; 3214 break; 3215 } 3216 } 3217 if (tp1 == NULL) { 3218 /* 3219 * Do it the other way , aka without paying 3220 * attention to queue seq order. 3221 */ 3222 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3223 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3224 if (tp1->rec.data.TSN_seq == tsn) { 3225 /* found it */ 3226 break; 3227 } 3228 } 3229 } 3230 if (tp1 == NULL) { 3231 SCTP_STAT_INCR(sctps_pdrptsnnf); 3232 } 3233 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3234 uint8_t *ddp; 3235 3236 if (((flg & SCTP_BADCRC) == 0) && 3237 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3238 return (0); 3239 } 3240 if ((stcb->asoc.peers_rwnd == 0) && 3241 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3242 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3243 return (0); 3244 } 3245 if (stcb->asoc.peers_rwnd == 0 && 3246 (flg & SCTP_FROM_MIDDLE_BOX)) { 3247 SCTP_STAT_INCR(sctps_pdrpdizrw); 3248 return (0); 3249 } 3250 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3251 sizeof(struct sctp_data_chunk)); 3252 { 3253 unsigned int iii; 3254 3255 for (iii = 0; iii < sizeof(desc->data_bytes); 3256 iii++) { 3257 if (ddp[iii] != desc->data_bytes[iii]) { 3258 SCTP_STAT_INCR(sctps_pdrpbadd); 3259 return (-1); 3260 } 3261 } 3262 } 3263 3264 if (tp1->do_rtt) { 3265 /* 3266 * this guy had a RTO calculation 3267 * pending on it, cancel it 3268 */ 3269 if (tp1->whoTo->rto_needed == 0) { 3270 tp1->whoTo->rto_needed = 1; 3271 } 3272 tp1->do_rtt = 0; 3273 } 3274 SCTP_STAT_INCR(sctps_pdrpmark); 3275 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3276 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3277 /* 3278 * mark it as if we were doing a FR, since 3279 * we will be getting gap ack reports behind 3280 * the info from the router. 3281 */ 3282 tp1->rec.data.doing_fast_retransmit = 1; 3283 /* 3284 * mark the tsn with what sequences can 3285 * cause a new FR. 3286 */ 3287 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3288 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3289 } else { 3290 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3291 } 3292 3293 /* restart the timer */ 3294 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3295 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3296 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3297 stcb, tp1->whoTo); 3298 3299 /* fix counts and things */ 3300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3301 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3302 tp1->whoTo->flight_size, 3303 tp1->book_size, 3304 (uintptr_t) stcb, 3305 tp1->rec.data.TSN_seq); 3306 } 3307 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3308 sctp_flight_size_decrease(tp1); 3309 sctp_total_flight_decrease(stcb, tp1); 3310 } 3311 tp1->sent = SCTP_DATAGRAM_RESEND; 3312 } { 3313 /* audit code */ 3314 unsigned int audit; 3315 3316 audit = 0; 3317 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3318 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3319 audit++; 3320 } 3321 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3322 sctp_next) { 3323 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3324 audit++; 3325 } 3326 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3327 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3328 audit, stcb->asoc.sent_queue_retran_cnt); 3329 #ifndef SCTP_AUDITING_ENABLED 3330 stcb->asoc.sent_queue_retran_cnt = audit; 3331 #endif 3332 } 3333 } 3334 } 3335 break; 3336 case SCTP_ASCONF: 3337 { 3338 struct sctp_tmit_chunk *asconf; 3339 3340 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3341 sctp_next) { 3342 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3343 break; 3344 } 3345 } 3346 if (asconf) { 3347 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3348 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3349 asconf->sent = SCTP_DATAGRAM_RESEND; 3350 asconf->snd_count--; 3351 } 3352 } 3353 break; 3354 case SCTP_INITIATION: 3355 /* resend the INIT */ 3356 stcb->asoc.dropped_special_cnt++; 3357 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3358 /* 3359 * If we can get it in, in a few attempts we do 3360 * this, otherwise we let the timer fire. 3361 */ 3362 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3363 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3364 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3365 } 3366 break; 3367 case SCTP_SELECTIVE_ACK: 3368 case SCTP_NR_SELECTIVE_ACK: 3369 /* resend the sack */ 3370 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3371 break; 3372 case SCTP_HEARTBEAT_REQUEST: 3373 /* resend a demand HB */ 3374 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3375 /* 3376 * Only retransmit if we KNOW we wont destroy the 3377 * tcb 3378 */ 3379 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3380 } 3381 break; 3382 case SCTP_SHUTDOWN: 3383 sctp_send_shutdown(stcb, net); 3384 break; 3385 case SCTP_SHUTDOWN_ACK: 3386 sctp_send_shutdown_ack(stcb, net); 3387 break; 3388 case SCTP_COOKIE_ECHO: 3389 { 3390 struct sctp_tmit_chunk *cookie; 3391 3392 cookie = NULL; 3393 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3394 sctp_next) { 3395 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3396 break; 3397 } 3398 } 3399 if (cookie) { 3400 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3401 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3402 cookie->sent = SCTP_DATAGRAM_RESEND; 3403 sctp_stop_all_cookie_timers(stcb); 3404 } 3405 } 3406 break; 3407 case SCTP_COOKIE_ACK: 3408 sctp_send_cookie_ack(stcb); 3409 break; 3410 case SCTP_ASCONF_ACK: 3411 /* resend last asconf ack */ 3412 sctp_send_asconf_ack(stcb); 3413 break; 3414 case SCTP_FORWARD_CUM_TSN: 3415 send_forward_tsn(stcb, &stcb->asoc); 3416 break; 3417 /* can't do anything with these */ 3418 case SCTP_PACKET_DROPPED: 3419 case SCTP_INITIATION_ACK: /* this should not happen */ 3420 case SCTP_HEARTBEAT_ACK: 3421 case SCTP_ABORT_ASSOCIATION: 3422 case SCTP_OPERATION_ERROR: 3423 case SCTP_SHUTDOWN_COMPLETE: 3424 case SCTP_ECN_ECHO: 3425 case SCTP_ECN_CWR: 3426 default: 3427 break; 3428 } 3429 return (0); 3430 } 3431 3432 void 3433 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3434 { 3435 uint32_t i; 3436 uint16_t temp; 3437 3438 /* 3439 * We set things to 0xffff since this is the last delivered sequence 3440 * and we will be sending in 0 after the reset. 3441 */ 3442 3443 if (number_entries) { 3444 for (i = 0; i < number_entries; i++) { 3445 temp = ntohs(list[i]); 3446 if (temp >= stcb->asoc.streamincnt) { 3447 continue; 3448 } 3449 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3450 } 3451 } else { 3452 list = NULL; 3453 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3454 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3455 } 3456 } 3457 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3458 } 3459 3460 static void 3461 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3462 { 3463 uint32_t i; 3464 uint16_t temp; 3465 3466 if (number_entries > 0) { 3467 for (i = 0; i < number_entries; i++) { 3468 temp = ntohs(list[i]); 3469 if (temp >= stcb->asoc.streamoutcnt) { 3470 /* no such stream */ 3471 continue; 3472 } 3473 stcb->asoc.strmout[temp].next_sequence_send = 0; 3474 } 3475 } else { 3476 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3477 stcb->asoc.strmout[i].next_sequence_send = 0; 3478 } 3479 } 3480 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3481 } 3482 3483 3484 struct sctp_stream_reset_request * 3485 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3486 { 3487 struct sctp_association *asoc; 3488 struct sctp_chunkhdr *ch; 3489 struct sctp_stream_reset_request *r; 3490 struct sctp_tmit_chunk *chk; 3491 int len, clen; 3492 3493 asoc = &stcb->asoc; 3494 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3495 asoc->stream_reset_outstanding = 0; 3496 return (NULL); 3497 } 3498 if (stcb->asoc.str_reset == NULL) { 3499 asoc->stream_reset_outstanding = 0; 3500 return (NULL); 3501 } 3502 chk = stcb->asoc.str_reset; 3503 if (chk->data == NULL) { 3504 return (NULL); 3505 } 3506 if (bchk) { 3507 /* he wants a copy of the chk pointer */ 3508 *bchk = chk; 3509 } 3510 clen = chk->send_size; 3511 ch = mtod(chk->data, struct sctp_chunkhdr *); 3512 r = (struct sctp_stream_reset_request *)(ch + 1); 3513 if (ntohl(r->request_seq) == seq) { 3514 /* found it */ 3515 return (r); 3516 } 3517 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3518 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3519 /* move to the next one, there can only be a max of two */ 3520 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3521 if (ntohl(r->request_seq) == seq) { 3522 return (r); 3523 } 3524 } 3525 /* that seq is not here */ 3526 return (NULL); 3527 } 3528 3529 static void 3530 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3531 { 3532 struct sctp_association *asoc; 3533 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3534 3535 if (stcb->asoc.str_reset == NULL) { 3536 return; 3537 } 3538 asoc = &stcb->asoc; 3539 3540 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3541 TAILQ_REMOVE(&asoc->control_send_queue, 3542 chk, 3543 sctp_next); 3544 if (chk->data) { 3545 sctp_m_freem(chk->data); 3546 chk->data = NULL; 3547 } 3548 asoc->ctrl_queue_cnt--; 3549 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3550 /* sa_ignore NO_NULL_CHK */ 3551 stcb->asoc.str_reset = NULL; 3552 } 3553 3554 3555 static int 3556 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3557 uint32_t seq, uint32_t action, 3558 struct sctp_stream_reset_response *respin) 3559 { 3560 uint16_t type; 3561 int lparm_len; 3562 struct sctp_association *asoc = &stcb->asoc; 3563 struct sctp_tmit_chunk *chk; 3564 struct sctp_stream_reset_request *req_param; 3565 struct sctp_stream_reset_out_request *req_out_param; 3566 struct sctp_stream_reset_in_request *req_in_param; 3567 uint32_t number_entries; 3568 3569 if (asoc->stream_reset_outstanding == 0) { 3570 /* duplicate */ 3571 return (0); 3572 } 3573 if (seq == stcb->asoc.str_reset_seq_out) { 3574 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3575 if (req_param != NULL) { 3576 stcb->asoc.str_reset_seq_out++; 3577 type = ntohs(req_param->ph.param_type); 3578 lparm_len = ntohs(req_param->ph.param_length); 3579 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3580 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3581 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3582 asoc->stream_reset_out_is_outstanding = 0; 3583 if (asoc->stream_reset_outstanding) 3584 asoc->stream_reset_outstanding--; 3585 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3586 /* do it */ 3587 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3588 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3589 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3590 } else { 3591 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3592 } 3593 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3594 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3595 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3596 if (asoc->stream_reset_outstanding) 3597 asoc->stream_reset_outstanding--; 3598 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3599 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3600 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3601 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3602 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3603 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3604 } 3605 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3606 /* Ok we now may have more streams */ 3607 int num_stream; 3608 3609 num_stream = stcb->asoc.strm_pending_add_size; 3610 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3611 /* TSNH */ 3612 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3613 } 3614 stcb->asoc.strm_pending_add_size = 0; 3615 if (asoc->stream_reset_outstanding) 3616 asoc->stream_reset_outstanding--; 3617 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3618 /* Put the new streams into effect */ 3619 stcb->asoc.streamoutcnt += num_stream; 3620 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3621 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3622 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3623 SCTP_STREAM_CHANGE_DENIED); 3624 } else { 3625 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3626 SCTP_STREAM_CHANGE_FAILED); 3627 } 3628 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3629 if (asoc->stream_reset_outstanding) 3630 asoc->stream_reset_outstanding--; 3631 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3632 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3633 SCTP_STREAM_CHANGE_DENIED); 3634 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3635 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3636 SCTP_STREAM_CHANGE_FAILED); 3637 } 3638 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3639 /** 3640 * a) Adopt the new in tsn. 3641 * b) reset the map 3642 * c) Adopt the new out-tsn 3643 */ 3644 struct sctp_stream_reset_response_tsn *resp; 3645 struct sctp_forward_tsn_chunk fwdtsn; 3646 int abort_flag = 0; 3647 3648 if (respin == NULL) { 3649 /* huh ? */ 3650 return (0); 3651 } 3652 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3653 resp = (struct sctp_stream_reset_response_tsn *)respin; 3654 asoc->stream_reset_outstanding--; 3655 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3656 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3657 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3658 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3659 if (abort_flag) { 3660 return (1); 3661 } 3662 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3663 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3664 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3665 } 3666 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3667 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3668 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3669 3670 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3671 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3672 3673 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3674 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3675 3676 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3677 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3678 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3679 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3680 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3681 SCTP_ASSOC_RESET_DENIED); 3682 } else { 3683 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3684 SCTP_ASSOC_RESET_FAILED); 3685 } 3686 } 3687 /* get rid of the request and get the request flags */ 3688 if (asoc->stream_reset_outstanding == 0) { 3689 sctp_clean_up_stream_reset(stcb); 3690 } 3691 } 3692 } 3693 return (0); 3694 } 3695 3696 static void 3697 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3698 struct sctp_tmit_chunk *chk, 3699 struct sctp_stream_reset_in_request *req, int trunc) 3700 { 3701 uint32_t seq; 3702 int len, i; 3703 int number_entries; 3704 uint16_t temp; 3705 3706 /* 3707 * peer wants me to send a str-reset to him for my outgoing seq's if 3708 * seq_in is right. 3709 */ 3710 struct sctp_association *asoc = &stcb->asoc; 3711 3712 seq = ntohl(req->request_seq); 3713 if (asoc->str_reset_seq_in == seq) { 3714 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3715 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3716 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3717 } else if (trunc) { 3718 /* Can't do it, since they exceeded our buffer size */ 3719 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3720 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3721 len = ntohs(req->ph.param_length); 3722 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3723 for (i = 0; i < number_entries; i++) { 3724 temp = ntohs(req->list_of_streams[i]); 3725 req->list_of_streams[i] = temp; 3726 } 3727 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3728 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3729 asoc->str_reset_seq_out, 3730 seq, (asoc->sending_seq - 1)); 3731 asoc->stream_reset_out_is_outstanding = 1; 3732 asoc->str_reset = chk; 3733 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3734 stcb->asoc.stream_reset_outstanding++; 3735 } else { 3736 /* Can't do it, since we have sent one out */ 3737 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3738 } 3739 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3740 asoc->str_reset_seq_in++; 3741 } else if (asoc->str_reset_seq_in - 1 == seq) { 3742 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3743 } else if (asoc->str_reset_seq_in - 2 == seq) { 3744 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3745 } else { 3746 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3747 } 3748 } 3749 3750 static int 3751 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3752 struct sctp_tmit_chunk *chk, 3753 struct sctp_stream_reset_tsn_request *req) 3754 { 3755 /* reset all in and out and update the tsn */ 3756 /* 3757 * A) reset my str-seq's on in and out. B) Select a receive next, 3758 * and set cum-ack to it. Also process this selected number as a 3759 * fwd-tsn as well. C) set in the response my next sending seq. 3760 */ 3761 struct sctp_forward_tsn_chunk fwdtsn; 3762 struct sctp_association *asoc = &stcb->asoc; 3763 int abort_flag = 0; 3764 uint32_t seq; 3765 3766 seq = ntohl(req->request_seq); 3767 if (asoc->str_reset_seq_in == seq) { 3768 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3769 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3770 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3771 } else { 3772 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3773 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3774 fwdtsn.ch.chunk_flags = 0; 3775 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3776 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3777 if (abort_flag) { 3778 return (1); 3779 } 3780 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3781 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3782 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3783 } 3784 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3785 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3786 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3787 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3788 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3789 atomic_add_int(&asoc->sending_seq, 1); 3790 /* save off historical data for retrans */ 3791 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3792 asoc->last_sending_seq[0] = asoc->sending_seq; 3793 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3794 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3795 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3796 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3797 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3798 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3799 } 3800 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3801 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3802 asoc->str_reset_seq_in++; 3803 } else if (asoc->str_reset_seq_in - 1 == seq) { 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 } else if (asoc->str_reset_seq_in - 2 == seq) { 3807 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3808 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3809 } else { 3810 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3811 } 3812 return (0); 3813 } 3814 3815 static void 3816 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3817 struct sctp_tmit_chunk *chk, 3818 struct sctp_stream_reset_out_request *req, int trunc) 3819 { 3820 uint32_t seq, tsn; 3821 int number_entries, len; 3822 struct sctp_association *asoc = &stcb->asoc; 3823 3824 seq = ntohl(req->request_seq); 3825 3826 /* now if its not a duplicate we process it */ 3827 if (asoc->str_reset_seq_in == seq) { 3828 len = ntohs(req->ph.param_length); 3829 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3830 /* 3831 * the sender is resetting, handle the list issue.. we must 3832 * a) verify if we can do the reset, if so no problem b) If 3833 * we can't do the reset we must copy the request. c) queue 3834 * it, and setup the data in processor to trigger it off 3835 * when needed and dequeue all the queued data. 3836 */ 3837 tsn = ntohl(req->send_reset_at_tsn); 3838 3839 /* move the reset action back one */ 3840 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3841 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3842 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3843 } else if (trunc) { 3844 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3845 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3846 /* we can do it now */ 3847 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3848 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3849 } else { 3850 /* 3851 * we must queue it up and thus wait for the TSN's 3852 * to arrive that are at or before tsn 3853 */ 3854 struct sctp_stream_reset_list *liste; 3855 int siz; 3856 3857 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3858 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3859 siz, SCTP_M_STRESET); 3860 if (liste == NULL) { 3861 /* gak out of memory */ 3862 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3863 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3864 return; 3865 } 3866 liste->tsn = tsn; 3867 liste->number_entries = number_entries; 3868 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3869 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3870 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3871 } 3872 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3873 asoc->str_reset_seq_in++; 3874 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3875 /* 3876 * one seq back, just echo back last action since my 3877 * response was lost. 3878 */ 3879 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3880 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3881 /* 3882 * two seq back, just echo back last action since my 3883 * response was lost. 3884 */ 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3886 } else { 3887 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3888 } 3889 } 3890 3891 static void 3892 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3893 struct sctp_stream_reset_add_strm *str_add) 3894 { 3895 /* 3896 * Peer is requesting to add more streams. If its within our 3897 * max-streams we will allow it. 3898 */ 3899 uint32_t num_stream, i; 3900 uint32_t seq; 3901 struct sctp_association *asoc = &stcb->asoc; 3902 struct sctp_queued_to_read *ctl, *nctl; 3903 3904 /* Get the number. */ 3905 seq = ntohl(str_add->request_seq); 3906 num_stream = ntohs(str_add->number_of_streams); 3907 /* Now what would be the new total? */ 3908 if (asoc->str_reset_seq_in == seq) { 3909 num_stream += stcb->asoc.streamincnt; 3910 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3911 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3912 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3913 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3914 (num_stream > 0xffff)) { 3915 /* We must reject it they ask for to many */ 3916 denied: 3917 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3918 } else { 3919 /* Ok, we can do that :-) */ 3920 struct sctp_stream_in *oldstrm; 3921 3922 /* save off the old */ 3923 oldstrm = stcb->asoc.strmin; 3924 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3925 (num_stream * sizeof(struct sctp_stream_in)), 3926 SCTP_M_STRMI); 3927 if (stcb->asoc.strmin == NULL) { 3928 stcb->asoc.strmin = oldstrm; 3929 goto denied; 3930 } 3931 /* copy off the old data */ 3932 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3933 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3934 stcb->asoc.strmin[i].stream_no = i; 3935 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3936 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3937 /* now anything on those queues? */ 3938 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3939 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3940 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3941 } 3942 } 3943 /* Init the new streams */ 3944 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3945 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3946 stcb->asoc.strmin[i].stream_no = i; 3947 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3948 stcb->asoc.strmin[i].delivery_started = 0; 3949 } 3950 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3951 /* update the size */ 3952 stcb->asoc.streamincnt = num_stream; 3953 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3954 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3955 } 3956 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3957 asoc->str_reset_seq_in++; 3958 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3959 /* 3960 * one seq back, just echo back last action since my 3961 * response was lost. 3962 */ 3963 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3964 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3965 /* 3966 * two seq back, just echo back last action since my 3967 * response was lost. 3968 */ 3969 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3970 } else { 3971 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3972 3973 } 3974 } 3975 3976 static void 3977 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3978 struct sctp_stream_reset_add_strm *str_add) 3979 { 3980 /* 3981 * Peer is requesting to add more streams. If its within our 3982 * max-streams we will allow it. 3983 */ 3984 uint16_t num_stream; 3985 uint32_t seq; 3986 struct sctp_association *asoc = &stcb->asoc; 3987 3988 /* Get the number. */ 3989 seq = ntohl(str_add->request_seq); 3990 num_stream = ntohs(str_add->number_of_streams); 3991 /* Now what would be the new total? */ 3992 if (asoc->str_reset_seq_in == seq) { 3993 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3994 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3995 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3996 } else if (stcb->asoc.stream_reset_outstanding) { 3997 /* We must reject it we have something pending */ 3998 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3999 } else { 4000 /* Ok, we can do that :-) */ 4001 int mychk; 4002 4003 mychk = stcb->asoc.streamoutcnt; 4004 mychk += num_stream; 4005 if (mychk < 0x10000) { 4006 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4007 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4008 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4009 } 4010 } else { 4011 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4012 } 4013 } 4014 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4015 asoc->str_reset_seq_in++; 4016 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4017 /* 4018 * one seq back, just echo back last action since my 4019 * response was lost. 4020 */ 4021 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4022 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4023 /* 4024 * two seq back, just echo back last action since my 4025 * response was lost. 4026 */ 4027 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4028 } else { 4029 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4030 } 4031 } 4032 4033 #ifdef __GNUC__ 4034 __attribute__((noinline)) 4035 #endif 4036 static int 4037 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4038 struct sctp_chunkhdr *ch_req) 4039 { 4040 int chk_length, param_len, ptype; 4041 struct sctp_paramhdr pstore; 4042 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4043 uint32_t seq = 0; 4044 int num_req = 0; 4045 int trunc = 0; 4046 struct sctp_tmit_chunk *chk; 4047 struct sctp_chunkhdr *ch; 4048 struct sctp_paramhdr *ph; 4049 int ret_code = 0; 4050 int num_param = 0; 4051 4052 /* now it may be a reset or a reset-response */ 4053 chk_length = ntohs(ch_req->chunk_length); 4054 4055 /* setup for adding the response */ 4056 sctp_alloc_a_chunk(stcb, chk); 4057 if (chk == NULL) { 4058 return (ret_code); 4059 } 4060 chk->copy_by_ref = 0; 4061 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4062 chk->rec.chunk_id.can_take_data = 0; 4063 chk->flags = 0; 4064 chk->asoc = &stcb->asoc; 4065 chk->no_fr_allowed = 0; 4066 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4067 chk->book_size_scale = 0; 4068 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4069 if (chk->data == NULL) { 4070 strres_nochunk: 4071 if (chk->data) { 4072 sctp_m_freem(chk->data); 4073 chk->data = NULL; 4074 } 4075 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4076 return (ret_code); 4077 } 4078 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4079 4080 /* setup chunk parameters */ 4081 chk->sent = SCTP_DATAGRAM_UNSENT; 4082 chk->snd_count = 0; 4083 chk->whoTo = NULL; 4084 4085 ch = mtod(chk->data, struct sctp_chunkhdr *); 4086 ch->chunk_type = SCTP_STREAM_RESET; 4087 ch->chunk_flags = 0; 4088 ch->chunk_length = htons(chk->send_size); 4089 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4090 offset += sizeof(struct sctp_chunkhdr); 4091 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4092 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4093 if (ph == NULL) 4094 break; 4095 param_len = ntohs(ph->param_length); 4096 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4097 /* bad param */ 4098 break; 4099 } 4100 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4101 (uint8_t *) & cstore); 4102 ptype = ntohs(ph->param_type); 4103 num_param++; 4104 if (param_len > (int)sizeof(cstore)) { 4105 trunc = 1; 4106 } else { 4107 trunc = 0; 4108 } 4109 if (num_param > SCTP_MAX_RESET_PARAMS) { 4110 /* hit the max of parameters already sorry.. */ 4111 break; 4112 } 4113 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4114 struct sctp_stream_reset_out_request *req_out; 4115 4116 req_out = (struct sctp_stream_reset_out_request *)ph; 4117 num_req++; 4118 if (stcb->asoc.stream_reset_outstanding) { 4119 seq = ntohl(req_out->response_seq); 4120 if (seq == stcb->asoc.str_reset_seq_out) { 4121 /* implicit ack */ 4122 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4123 } 4124 } 4125 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4126 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4127 struct sctp_stream_reset_add_strm *str_add; 4128 4129 str_add = (struct sctp_stream_reset_add_strm *)ph; 4130 num_req++; 4131 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4132 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4133 struct sctp_stream_reset_add_strm *str_add; 4134 4135 str_add = (struct sctp_stream_reset_add_strm *)ph; 4136 num_req++; 4137 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4138 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4139 struct sctp_stream_reset_in_request *req_in; 4140 4141 num_req++; 4142 req_in = (struct sctp_stream_reset_in_request *)ph; 4143 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4144 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4145 struct sctp_stream_reset_tsn_request *req_tsn; 4146 4147 num_req++; 4148 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4149 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4150 ret_code = 1; 4151 goto strres_nochunk; 4152 } 4153 /* no more */ 4154 break; 4155 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4156 struct sctp_stream_reset_response *resp; 4157 uint32_t result; 4158 4159 resp = (struct sctp_stream_reset_response *)ph; 4160 seq = ntohl(resp->response_seq); 4161 result = ntohl(resp->result); 4162 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4163 ret_code = 1; 4164 goto strres_nochunk; 4165 } 4166 } else { 4167 break; 4168 } 4169 offset += SCTP_SIZE32(param_len); 4170 chk_length -= SCTP_SIZE32(param_len); 4171 } 4172 if (num_req == 0) { 4173 /* we have no response free the stuff */ 4174 goto strres_nochunk; 4175 } 4176 /* ok we have a chunk to link in */ 4177 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4178 chk, 4179 sctp_next); 4180 stcb->asoc.ctrl_queue_cnt++; 4181 return (ret_code); 4182 } 4183 4184 /* 4185 * Handle a router or endpoints report of a packet loss, there are two ways 4186 * to handle this, either we get the whole packet and must disect it 4187 * ourselves (possibly with truncation and or corruption) or it is a summary 4188 * from a middle box that did the disectting for us. 4189 */ 4190 static void 4191 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4192 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4193 { 4194 uint32_t bottle_bw, on_queue; 4195 uint16_t trunc_len; 4196 unsigned int chlen; 4197 unsigned int at; 4198 struct sctp_chunk_desc desc; 4199 struct sctp_chunkhdr *ch; 4200 4201 chlen = ntohs(cp->ch.chunk_length); 4202 chlen -= sizeof(struct sctp_pktdrop_chunk); 4203 /* XXX possible chlen underflow */ 4204 if (chlen == 0) { 4205 ch = NULL; 4206 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4207 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4208 } else { 4209 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4210 chlen -= sizeof(struct sctphdr); 4211 /* XXX possible chlen underflow */ 4212 memset(&desc, 0, sizeof(desc)); 4213 } 4214 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4215 if (trunc_len > limit) { 4216 trunc_len = limit; 4217 } 4218 /* now the chunks themselves */ 4219 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4220 desc.chunk_type = ch->chunk_type; 4221 /* get amount we need to move */ 4222 at = ntohs(ch->chunk_length); 4223 if (at < sizeof(struct sctp_chunkhdr)) { 4224 /* corrupt chunk, maybe at the end? */ 4225 SCTP_STAT_INCR(sctps_pdrpcrupt); 4226 break; 4227 } 4228 if (trunc_len == 0) { 4229 /* we are supposed to have all of it */ 4230 if (at > chlen) { 4231 /* corrupt skip it */ 4232 SCTP_STAT_INCR(sctps_pdrpcrupt); 4233 break; 4234 } 4235 } else { 4236 /* is there enough of it left ? */ 4237 if (desc.chunk_type == SCTP_DATA) { 4238 if (chlen < (sizeof(struct sctp_data_chunk) + 4239 sizeof(desc.data_bytes))) { 4240 break; 4241 } 4242 } else { 4243 if (chlen < sizeof(struct sctp_chunkhdr)) { 4244 break; 4245 } 4246 } 4247 } 4248 if (desc.chunk_type == SCTP_DATA) { 4249 /* can we get out the tsn? */ 4250 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4251 SCTP_STAT_INCR(sctps_pdrpmbda); 4252 4253 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4254 /* yep */ 4255 struct sctp_data_chunk *dcp; 4256 uint8_t *ddp; 4257 unsigned int iii; 4258 4259 dcp = (struct sctp_data_chunk *)ch; 4260 ddp = (uint8_t *) (dcp + 1); 4261 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4262 desc.data_bytes[iii] = ddp[iii]; 4263 } 4264 desc.tsn_ifany = dcp->dp.tsn; 4265 } else { 4266 /* nope we are done. */ 4267 SCTP_STAT_INCR(sctps_pdrpnedat); 4268 break; 4269 } 4270 } else { 4271 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4272 SCTP_STAT_INCR(sctps_pdrpmbct); 4273 } 4274 4275 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4276 SCTP_STAT_INCR(sctps_pdrppdbrk); 4277 break; 4278 } 4279 if (SCTP_SIZE32(at) > chlen) { 4280 break; 4281 } 4282 chlen -= SCTP_SIZE32(at); 4283 if (chlen < sizeof(struct sctp_chunkhdr)) { 4284 /* done, none left */ 4285 break; 4286 } 4287 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4288 } 4289 /* Now update any rwnd --- possibly */ 4290 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4291 /* From a peer, we get a rwnd report */ 4292 uint32_t a_rwnd; 4293 4294 SCTP_STAT_INCR(sctps_pdrpfehos); 4295 4296 bottle_bw = ntohl(cp->bottle_bw); 4297 on_queue = ntohl(cp->current_onq); 4298 if (bottle_bw && on_queue) { 4299 /* a rwnd report is in here */ 4300 if (bottle_bw > on_queue) 4301 a_rwnd = bottle_bw - on_queue; 4302 else 4303 a_rwnd = 0; 4304 4305 if (a_rwnd == 0) 4306 stcb->asoc.peers_rwnd = 0; 4307 else { 4308 if (a_rwnd > stcb->asoc.total_flight) { 4309 stcb->asoc.peers_rwnd = 4310 a_rwnd - stcb->asoc.total_flight; 4311 } else { 4312 stcb->asoc.peers_rwnd = 0; 4313 } 4314 if (stcb->asoc.peers_rwnd < 4315 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4316 /* SWS sender side engages */ 4317 stcb->asoc.peers_rwnd = 0; 4318 } 4319 } 4320 } 4321 } else { 4322 SCTP_STAT_INCR(sctps_pdrpfmbox); 4323 } 4324 4325 /* now middle boxes in sat networks get a cwnd bump */ 4326 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4327 (stcb->asoc.sat_t3_loss_recovery == 0) && 4328 (stcb->asoc.sat_network)) { 4329 /* 4330 * This is debateable but for sat networks it makes sense 4331 * Note if a T3 timer has went off, we will prohibit any 4332 * changes to cwnd until we exit the t3 loss recovery. 4333 */ 4334 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4335 net, cp, &bottle_bw, &on_queue); 4336 } 4337 } 4338 4339 /* 4340 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4341 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4342 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4343 * length of the complete packet outputs: - length: modified to remaining 4344 * length after control processing - netp: modified to new sctp_nets after 4345 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4346 * bad packet,...) otherwise return the tcb for this packet 4347 */ 4348 #ifdef __GNUC__ 4349 __attribute__((noinline)) 4350 #endif 4351 static struct sctp_tcb * 4352 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4353 struct sockaddr *src, struct sockaddr *dst, 4354 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4355 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4356 uint8_t mflowtype, uint32_t mflowid, 4357 uint32_t vrf_id, uint16_t port) 4358 { 4359 struct sctp_association *asoc; 4360 struct mbuf *op_err; 4361 char msg[SCTP_DIAG_INFO_LEN]; 4362 uint32_t vtag_in; 4363 int num_chunks = 0; /* number of control chunks processed */ 4364 uint32_t chk_length; 4365 int ret; 4366 int abort_no_unlock = 0; 4367 int ecne_seen = 0; 4368 4369 /* 4370 * How big should this be, and should it be alloc'd? Lets try the 4371 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4372 * until we get into jumbo grams and such.. 4373 */ 4374 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4375 struct sctp_tcb *locked_tcb = stcb; 4376 int got_auth = 0; 4377 uint32_t auth_offset = 0, auth_len = 0; 4378 int auth_skipped = 0; 4379 int asconf_cnt = 0; 4380 4381 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4382 struct socket *so; 4383 4384 #endif 4385 4386 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4387 iphlen, *offset, length, (void *)stcb); 4388 4389 /* validate chunk header length... */ 4390 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4391 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4392 ntohs(ch->chunk_length)); 4393 if (locked_tcb) { 4394 SCTP_TCB_UNLOCK(locked_tcb); 4395 } 4396 return (NULL); 4397 } 4398 /* 4399 * validate the verification tag 4400 */ 4401 vtag_in = ntohl(sh->v_tag); 4402 4403 if (locked_tcb) { 4404 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4405 } 4406 if (ch->chunk_type == SCTP_INITIATION) { 4407 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4408 ntohs(ch->chunk_length), vtag_in); 4409 if (vtag_in != 0) { 4410 /* protocol error- silently discard... */ 4411 SCTP_STAT_INCR(sctps_badvtag); 4412 if (locked_tcb) { 4413 SCTP_TCB_UNLOCK(locked_tcb); 4414 } 4415 return (NULL); 4416 } 4417 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4418 /* 4419 * If there is no stcb, skip the AUTH chunk and process 4420 * later after a stcb is found (to validate the lookup was 4421 * valid. 4422 */ 4423 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4424 (stcb == NULL) && 4425 (inp->auth_supported == 1)) { 4426 /* save this chunk for later processing */ 4427 auth_skipped = 1; 4428 auth_offset = *offset; 4429 auth_len = ntohs(ch->chunk_length); 4430 4431 /* (temporarily) move past this chunk */ 4432 *offset += SCTP_SIZE32(auth_len); 4433 if (*offset >= length) { 4434 /* no more data left in the mbuf chain */ 4435 *offset = length; 4436 if (locked_tcb) { 4437 SCTP_TCB_UNLOCK(locked_tcb); 4438 } 4439 return (NULL); 4440 } 4441 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4442 sizeof(struct sctp_chunkhdr), chunk_buf); 4443 } 4444 if (ch == NULL) { 4445 /* Help */ 4446 *offset = length; 4447 if (locked_tcb) { 4448 SCTP_TCB_UNLOCK(locked_tcb); 4449 } 4450 return (NULL); 4451 } 4452 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4453 goto process_control_chunks; 4454 } 4455 /* 4456 * first check if it's an ASCONF with an unknown src addr we 4457 * need to look inside to find the association 4458 */ 4459 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4460 struct sctp_chunkhdr *asconf_ch = ch; 4461 uint32_t asconf_offset = 0, asconf_len = 0; 4462 4463 /* inp's refcount may be reduced */ 4464 SCTP_INP_INCR_REF(inp); 4465 4466 asconf_offset = *offset; 4467 do { 4468 asconf_len = ntohs(asconf_ch->chunk_length); 4469 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4470 break; 4471 stcb = sctp_findassociation_ep_asconf(m, 4472 *offset, 4473 dst, 4474 sh, &inp, netp, vrf_id); 4475 if (stcb != NULL) 4476 break; 4477 asconf_offset += SCTP_SIZE32(asconf_len); 4478 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4479 sizeof(struct sctp_chunkhdr), chunk_buf); 4480 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4481 if (stcb == NULL) { 4482 /* 4483 * reduce inp's refcount if not reduced in 4484 * sctp_findassociation_ep_asconf(). 4485 */ 4486 SCTP_INP_DECR_REF(inp); 4487 } else { 4488 locked_tcb = stcb; 4489 } 4490 4491 /* now go back and verify any auth chunk to be sure */ 4492 if (auth_skipped && (stcb != NULL)) { 4493 struct sctp_auth_chunk *auth; 4494 4495 auth = (struct sctp_auth_chunk *) 4496 sctp_m_getptr(m, auth_offset, 4497 auth_len, chunk_buf); 4498 got_auth = 1; 4499 auth_skipped = 0; 4500 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4501 auth_offset)) { 4502 /* auth HMAC failed so dump it */ 4503 *offset = length; 4504 if (locked_tcb) { 4505 SCTP_TCB_UNLOCK(locked_tcb); 4506 } 4507 return (NULL); 4508 } else { 4509 /* remaining chunks are HMAC checked */ 4510 stcb->asoc.authenticated = 1; 4511 } 4512 } 4513 } 4514 if (stcb == NULL) { 4515 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4516 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4517 msg); 4518 /* no association, so it's out of the blue... */ 4519 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4520 mflowtype, mflowid, 4521 vrf_id, port); 4522 *offset = length; 4523 if (locked_tcb) { 4524 SCTP_TCB_UNLOCK(locked_tcb); 4525 } 4526 return (NULL); 4527 } 4528 asoc = &stcb->asoc; 4529 /* ABORT and SHUTDOWN can use either v_tag... */ 4530 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4531 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4532 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4533 /* Take the T-bit always into account. */ 4534 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4535 (vtag_in == asoc->my_vtag)) || 4536 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4537 (vtag_in == asoc->peer_vtag))) { 4538 /* this is valid */ 4539 } else { 4540 /* drop this packet... */ 4541 SCTP_STAT_INCR(sctps_badvtag); 4542 if (locked_tcb) { 4543 SCTP_TCB_UNLOCK(locked_tcb); 4544 } 4545 return (NULL); 4546 } 4547 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4548 if (vtag_in != asoc->my_vtag) { 4549 /* 4550 * this could be a stale SHUTDOWN-ACK or the 4551 * peer never got the SHUTDOWN-COMPLETE and 4552 * is still hung; we have started a new asoc 4553 * but it won't complete until the shutdown 4554 * is completed 4555 */ 4556 if (locked_tcb) { 4557 SCTP_TCB_UNLOCK(locked_tcb); 4558 } 4559 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4560 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4561 msg); 4562 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4563 sh, inp, op_err, 4564 mflowtype, mflowid, 4565 vrf_id, port); 4566 return (NULL); 4567 } 4568 } else { 4569 /* for all other chunks, vtag must match */ 4570 if (vtag_in != asoc->my_vtag) { 4571 /* invalid vtag... */ 4572 SCTPDBG(SCTP_DEBUG_INPUT3, 4573 "invalid vtag: %xh, expect %xh\n", 4574 vtag_in, asoc->my_vtag); 4575 SCTP_STAT_INCR(sctps_badvtag); 4576 if (locked_tcb) { 4577 SCTP_TCB_UNLOCK(locked_tcb); 4578 } 4579 *offset = length; 4580 return (NULL); 4581 } 4582 } 4583 } /* end if !SCTP_COOKIE_ECHO */ 4584 /* 4585 * process all control chunks... 4586 */ 4587 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4588 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4589 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4590 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4591 /* implied cookie-ack.. we must have lost the ack */ 4592 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4593 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4594 stcb->asoc.overall_error_count, 4595 0, 4596 SCTP_FROM_SCTP_INPUT, 4597 __LINE__); 4598 } 4599 stcb->asoc.overall_error_count = 0; 4600 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4601 *netp); 4602 } 4603 process_control_chunks: 4604 while (IS_SCTP_CONTROL(ch)) { 4605 /* validate chunk length */ 4606 chk_length = ntohs(ch->chunk_length); 4607 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4608 ch->chunk_type, chk_length); 4609 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4610 if (chk_length < sizeof(*ch) || 4611 (*offset + (int)chk_length) > length) { 4612 *offset = length; 4613 if (locked_tcb) { 4614 SCTP_TCB_UNLOCK(locked_tcb); 4615 } 4616 return (NULL); 4617 } 4618 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4619 /* 4620 * INIT-ACK only gets the init ack "header" portion only 4621 * because we don't have to process the peer's COOKIE. All 4622 * others get a complete chunk. 4623 */ 4624 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4625 (ch->chunk_type == SCTP_INITIATION)) { 4626 /* get an init-ack chunk */ 4627 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4628 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4629 if (ch == NULL) { 4630 *offset = length; 4631 if (locked_tcb) { 4632 SCTP_TCB_UNLOCK(locked_tcb); 4633 } 4634 return (NULL); 4635 } 4636 } else { 4637 /* For cookies and all other chunks. */ 4638 if (chk_length > sizeof(chunk_buf)) { 4639 /* 4640 * use just the size of the chunk buffer so 4641 * the front part of our chunks fit in 4642 * contiguous space up to the chunk buffer 4643 * size (508 bytes). For chunks that need to 4644 * get more than that they must use the 4645 * sctp_m_getptr() function or other means 4646 * (e.g. know how to parse mbuf chains). 4647 * Cookies do this already. 4648 */ 4649 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4650 (sizeof(chunk_buf) - 4), 4651 chunk_buf); 4652 if (ch == NULL) { 4653 *offset = length; 4654 if (locked_tcb) { 4655 SCTP_TCB_UNLOCK(locked_tcb); 4656 } 4657 return (NULL); 4658 } 4659 } else { 4660 /* We can fit it all */ 4661 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4662 chk_length, chunk_buf); 4663 if (ch == NULL) { 4664 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4665 *offset = length; 4666 if (locked_tcb) { 4667 SCTP_TCB_UNLOCK(locked_tcb); 4668 } 4669 return (NULL); 4670 } 4671 } 4672 } 4673 num_chunks++; 4674 /* Save off the last place we got a control from */ 4675 if (stcb != NULL) { 4676 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4677 /* 4678 * allow last_control to be NULL if 4679 * ASCONF... ASCONF processing will find the 4680 * right net later 4681 */ 4682 if ((netp != NULL) && (*netp != NULL)) 4683 stcb->asoc.last_control_chunk_from = *netp; 4684 } 4685 } 4686 #ifdef SCTP_AUDITING_ENABLED 4687 sctp_audit_log(0xB0, ch->chunk_type); 4688 #endif 4689 4690 /* check to see if this chunk required auth, but isn't */ 4691 if ((stcb != NULL) && 4692 (stcb->asoc.auth_supported == 1) && 4693 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4694 !stcb->asoc.authenticated) { 4695 /* "silently" ignore */ 4696 SCTP_STAT_INCR(sctps_recvauthmissing); 4697 goto next_chunk; 4698 } 4699 switch (ch->chunk_type) { 4700 case SCTP_INITIATION: 4701 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4702 /* The INIT chunk must be the only chunk. */ 4703 if ((num_chunks > 1) || 4704 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4705 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4706 "INIT not the only chunk"); 4707 sctp_abort_association(inp, stcb, m, iphlen, 4708 src, dst, sh, op_err, 4709 mflowtype, mflowid, 4710 vrf_id, port); 4711 *offset = length; 4712 return (NULL); 4713 } 4714 /* Honor our resource limit. */ 4715 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4716 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4717 sctp_abort_association(inp, stcb, m, iphlen, 4718 src, dst, sh, op_err, 4719 mflowtype, mflowid, 4720 vrf_id, port); 4721 *offset = length; 4722 return (NULL); 4723 } 4724 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4725 (struct sctp_init_chunk *)ch, inp, 4726 stcb, &abort_no_unlock, 4727 mflowtype, mflowid, 4728 vrf_id, port); 4729 *offset = length; 4730 if ((!abort_no_unlock) && (locked_tcb)) { 4731 SCTP_TCB_UNLOCK(locked_tcb); 4732 } 4733 return (NULL); 4734 break; 4735 case SCTP_PAD_CHUNK: 4736 break; 4737 case SCTP_INITIATION_ACK: 4738 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4739 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4740 /* We are not interested anymore */ 4741 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4742 ; 4743 } else { 4744 if (locked_tcb != stcb) { 4745 /* Very unlikely */ 4746 SCTP_TCB_UNLOCK(locked_tcb); 4747 } 4748 *offset = length; 4749 if (stcb) { 4750 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4751 so = SCTP_INP_SO(inp); 4752 atomic_add_int(&stcb->asoc.refcnt, 1); 4753 SCTP_TCB_UNLOCK(stcb); 4754 SCTP_SOCKET_LOCK(so, 1); 4755 SCTP_TCB_LOCK(stcb); 4756 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4757 #endif 4758 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4759 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4760 SCTP_SOCKET_UNLOCK(so, 1); 4761 #endif 4762 } 4763 return (NULL); 4764 } 4765 } 4766 /* The INIT-ACK chunk must be the only chunk. */ 4767 if ((num_chunks > 1) || 4768 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4769 *offset = length; 4770 if (locked_tcb) { 4771 SCTP_TCB_UNLOCK(locked_tcb); 4772 } 4773 return (NULL); 4774 } 4775 if ((netp) && (*netp)) { 4776 ret = sctp_handle_init_ack(m, iphlen, *offset, 4777 src, dst, sh, 4778 (struct sctp_init_ack_chunk *)ch, 4779 stcb, *netp, 4780 &abort_no_unlock, 4781 mflowtype, mflowid, 4782 vrf_id); 4783 } else { 4784 ret = -1; 4785 } 4786 *offset = length; 4787 if (abort_no_unlock) { 4788 return (NULL); 4789 } 4790 /* 4791 * Special case, I must call the output routine to 4792 * get the cookie echoed 4793 */ 4794 if ((stcb != NULL) && (ret == 0)) { 4795 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4796 } 4797 if (locked_tcb) { 4798 SCTP_TCB_UNLOCK(locked_tcb); 4799 } 4800 return (NULL); 4801 break; 4802 case SCTP_SELECTIVE_ACK: 4803 { 4804 struct sctp_sack_chunk *sack; 4805 int abort_now = 0; 4806 uint32_t a_rwnd, cum_ack; 4807 uint16_t num_seg, num_dup; 4808 uint8_t flags; 4809 int offset_seg, offset_dup; 4810 4811 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4812 SCTP_STAT_INCR(sctps_recvsacks); 4813 if (stcb == NULL) { 4814 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4815 break; 4816 } 4817 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4818 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4819 break; 4820 } 4821 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4822 /*- 4823 * If we have sent a shutdown-ack, we will pay no 4824 * attention to a sack sent in to us since 4825 * we don't care anymore. 4826 */ 4827 break; 4828 } 4829 sack = (struct sctp_sack_chunk *)ch; 4830 flags = ch->chunk_flags; 4831 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4832 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4833 num_dup = ntohs(sack->sack.num_dup_tsns); 4834 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4835 if (sizeof(struct sctp_sack_chunk) + 4836 num_seg * sizeof(struct sctp_gap_ack_block) + 4837 num_dup * sizeof(uint32_t) != chk_length) { 4838 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4839 break; 4840 } 4841 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4842 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4843 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4844 cum_ack, num_seg, a_rwnd); 4845 stcb->asoc.seen_a_sack_this_pkt = 1; 4846 if ((stcb->asoc.pr_sctp_cnt == 0) && 4847 (num_seg == 0) && 4848 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4849 (stcb->asoc.saw_sack_with_frags == 0) && 4850 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4851 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4852 ) { 4853 /* 4854 * We have a SIMPLE sack having no 4855 * prior segments and data on sent 4856 * queue to be acked.. Use the 4857 * faster path sack processing. We 4858 * also allow window update sacks 4859 * with no missing segments to go 4860 * this way too. 4861 */ 4862 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4863 } else { 4864 if (netp && *netp) 4865 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4866 num_seg, 0, num_dup, &abort_now, flags, 4867 cum_ack, a_rwnd, ecne_seen); 4868 } 4869 if (abort_now) { 4870 /* ABORT signal from sack processing */ 4871 *offset = length; 4872 return (NULL); 4873 } 4874 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4875 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4876 (stcb->asoc.stream_queue_cnt == 0)) { 4877 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4878 } 4879 } 4880 break; 4881 /* 4882 * EY - nr_sack: If the received chunk is an 4883 * nr_sack chunk 4884 */ 4885 case SCTP_NR_SELECTIVE_ACK: 4886 { 4887 struct sctp_nr_sack_chunk *nr_sack; 4888 int abort_now = 0; 4889 uint32_t a_rwnd, cum_ack; 4890 uint16_t num_seg, num_nr_seg, num_dup; 4891 uint8_t flags; 4892 int offset_seg, offset_dup; 4893 4894 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4895 SCTP_STAT_INCR(sctps_recvsacks); 4896 if (stcb == NULL) { 4897 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4898 break; 4899 } 4900 if (stcb->asoc.nrsack_supported == 0) { 4901 goto unknown_chunk; 4902 } 4903 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4904 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4905 break; 4906 } 4907 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4908 /*- 4909 * If we have sent a shutdown-ack, we will pay no 4910 * attention to a sack sent in to us since 4911 * we don't care anymore. 4912 */ 4913 break; 4914 } 4915 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4916 flags = ch->chunk_flags; 4917 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4918 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4919 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4920 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4921 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4922 if (sizeof(struct sctp_nr_sack_chunk) + 4923 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4924 num_dup * sizeof(uint32_t) != chk_length) { 4925 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4926 break; 4927 } 4928 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4929 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4930 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4931 cum_ack, num_seg, a_rwnd); 4932 stcb->asoc.seen_a_sack_this_pkt = 1; 4933 if ((stcb->asoc.pr_sctp_cnt == 0) && 4934 (num_seg == 0) && (num_nr_seg == 0) && 4935 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4936 (stcb->asoc.saw_sack_with_frags == 0) && 4937 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4938 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4939 /* 4940 * We have a SIMPLE sack having no 4941 * prior segments and data on sent 4942 * queue to be acked. Use the faster 4943 * path sack processing. We also 4944 * allow window update sacks with no 4945 * missing segments to go this way 4946 * too. 4947 */ 4948 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4949 &abort_now, ecne_seen); 4950 } else { 4951 if (netp && *netp) 4952 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4953 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4954 cum_ack, a_rwnd, ecne_seen); 4955 } 4956 if (abort_now) { 4957 /* ABORT signal from sack processing */ 4958 *offset = length; 4959 return (NULL); 4960 } 4961 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4962 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4963 (stcb->asoc.stream_queue_cnt == 0)) { 4964 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4965 } 4966 } 4967 break; 4968 4969 case SCTP_HEARTBEAT_REQUEST: 4970 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4971 if ((stcb) && netp && *netp) { 4972 SCTP_STAT_INCR(sctps_recvheartbeat); 4973 sctp_send_heartbeat_ack(stcb, m, *offset, 4974 chk_length, *netp); 4975 4976 /* He's alive so give him credit */ 4977 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4978 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4979 stcb->asoc.overall_error_count, 4980 0, 4981 SCTP_FROM_SCTP_INPUT, 4982 __LINE__); 4983 } 4984 stcb->asoc.overall_error_count = 0; 4985 } 4986 break; 4987 case SCTP_HEARTBEAT_ACK: 4988 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4989 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4990 /* Its not ours */ 4991 *offset = length; 4992 if (locked_tcb) { 4993 SCTP_TCB_UNLOCK(locked_tcb); 4994 } 4995 return (NULL); 4996 } 4997 /* He's alive so give him credit */ 4998 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4999 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5000 stcb->asoc.overall_error_count, 5001 0, 5002 SCTP_FROM_SCTP_INPUT, 5003 __LINE__); 5004 } 5005 stcb->asoc.overall_error_count = 0; 5006 SCTP_STAT_INCR(sctps_recvheartbeatack); 5007 if (netp && *netp) 5008 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5009 stcb, *netp); 5010 break; 5011 case SCTP_ABORT_ASSOCIATION: 5012 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5013 (void *)stcb); 5014 if ((stcb) && netp && *netp) 5015 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5016 stcb, *netp); 5017 *offset = length; 5018 return (NULL); 5019 break; 5020 case SCTP_SHUTDOWN: 5021 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5022 (void *)stcb); 5023 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5024 *offset = length; 5025 if (locked_tcb) { 5026 SCTP_TCB_UNLOCK(locked_tcb); 5027 } 5028 return (NULL); 5029 } 5030 if (netp && *netp) { 5031 int abort_flag = 0; 5032 5033 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5034 stcb, *netp, &abort_flag); 5035 if (abort_flag) { 5036 *offset = length; 5037 return (NULL); 5038 } 5039 } 5040 break; 5041 case SCTP_SHUTDOWN_ACK: 5042 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5043 if ((stcb) && (netp) && (*netp)) 5044 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5045 *offset = length; 5046 return (NULL); 5047 break; 5048 5049 case SCTP_OPERATION_ERROR: 5050 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5051 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5052 *offset = length; 5053 return (NULL); 5054 } 5055 break; 5056 case SCTP_COOKIE_ECHO: 5057 SCTPDBG(SCTP_DEBUG_INPUT3, 5058 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5059 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5060 ; 5061 } else { 5062 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5063 /* We are not interested anymore */ 5064 abend: 5065 if (stcb) { 5066 SCTP_TCB_UNLOCK(stcb); 5067 } 5068 *offset = length; 5069 return (NULL); 5070 } 5071 } 5072 /* 5073 * First are we accepting? We do this again here 5074 * since it is possible that a previous endpoint WAS 5075 * listening responded to a INIT-ACK and then 5076 * closed. We opened and bound.. and are now no 5077 * longer listening. 5078 */ 5079 5080 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5081 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5082 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5083 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5084 sctp_abort_association(inp, stcb, m, iphlen, 5085 src, dst, sh, op_err, 5086 mflowtype, mflowid, 5087 vrf_id, port); 5088 } 5089 *offset = length; 5090 return (NULL); 5091 } else { 5092 struct mbuf *ret_buf; 5093 struct sctp_inpcb *linp; 5094 5095 if (stcb) { 5096 linp = NULL; 5097 } else { 5098 linp = inp; 5099 } 5100 5101 if (linp) { 5102 SCTP_ASOC_CREATE_LOCK(linp); 5103 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5104 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5105 SCTP_ASOC_CREATE_UNLOCK(linp); 5106 goto abend; 5107 } 5108 } 5109 if (netp) { 5110 ret_buf = 5111 sctp_handle_cookie_echo(m, iphlen, 5112 *offset, 5113 src, dst, 5114 sh, 5115 (struct sctp_cookie_echo_chunk *)ch, 5116 &inp, &stcb, netp, 5117 auth_skipped, 5118 auth_offset, 5119 auth_len, 5120 &locked_tcb, 5121 mflowtype, 5122 mflowid, 5123 vrf_id, 5124 port); 5125 } else { 5126 ret_buf = NULL; 5127 } 5128 if (linp) { 5129 SCTP_ASOC_CREATE_UNLOCK(linp); 5130 } 5131 if (ret_buf == NULL) { 5132 if (locked_tcb) { 5133 SCTP_TCB_UNLOCK(locked_tcb); 5134 } 5135 SCTPDBG(SCTP_DEBUG_INPUT3, 5136 "GAK, null buffer\n"); 5137 *offset = length; 5138 return (NULL); 5139 } 5140 /* if AUTH skipped, see if it verified... */ 5141 if (auth_skipped) { 5142 got_auth = 1; 5143 auth_skipped = 0; 5144 } 5145 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5146 /* 5147 * Restart the timer if we have 5148 * pending data 5149 */ 5150 struct sctp_tmit_chunk *chk; 5151 5152 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5153 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5154 } 5155 } 5156 break; 5157 case SCTP_COOKIE_ACK: 5158 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5159 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5160 if (locked_tcb) { 5161 SCTP_TCB_UNLOCK(locked_tcb); 5162 } 5163 return (NULL); 5164 } 5165 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5166 /* We are not interested anymore */ 5167 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5168 ; 5169 } else if (stcb) { 5170 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5171 so = SCTP_INP_SO(inp); 5172 atomic_add_int(&stcb->asoc.refcnt, 1); 5173 SCTP_TCB_UNLOCK(stcb); 5174 SCTP_SOCKET_LOCK(so, 1); 5175 SCTP_TCB_LOCK(stcb); 5176 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5177 #endif 5178 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5180 SCTP_SOCKET_UNLOCK(so, 1); 5181 #endif 5182 *offset = length; 5183 return (NULL); 5184 } 5185 } 5186 /* He's alive so give him credit */ 5187 if ((stcb) && netp && *netp) { 5188 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5189 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5190 stcb->asoc.overall_error_count, 5191 0, 5192 SCTP_FROM_SCTP_INPUT, 5193 __LINE__); 5194 } 5195 stcb->asoc.overall_error_count = 0; 5196 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5197 } 5198 break; 5199 case SCTP_ECN_ECHO: 5200 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5201 /* He's alive so give him credit */ 5202 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5203 /* Its not ours */ 5204 if (locked_tcb) { 5205 SCTP_TCB_UNLOCK(locked_tcb); 5206 } 5207 *offset = length; 5208 return (NULL); 5209 } 5210 if (stcb) { 5211 if (stcb->asoc.ecn_supported == 0) { 5212 goto unknown_chunk; 5213 } 5214 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5215 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5216 stcb->asoc.overall_error_count, 5217 0, 5218 SCTP_FROM_SCTP_INPUT, 5219 __LINE__); 5220 } 5221 stcb->asoc.overall_error_count = 0; 5222 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5223 stcb); 5224 ecne_seen = 1; 5225 } 5226 break; 5227 case SCTP_ECN_CWR: 5228 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5229 /* He's alive so give him credit */ 5230 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5231 /* Its not ours */ 5232 if (locked_tcb) { 5233 SCTP_TCB_UNLOCK(locked_tcb); 5234 } 5235 *offset = length; 5236 return (NULL); 5237 } 5238 if (stcb) { 5239 if (stcb->asoc.ecn_supported == 0) { 5240 goto unknown_chunk; 5241 } 5242 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5243 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5244 stcb->asoc.overall_error_count, 5245 0, 5246 SCTP_FROM_SCTP_INPUT, 5247 __LINE__); 5248 } 5249 stcb->asoc.overall_error_count = 0; 5250 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5251 } 5252 break; 5253 case SCTP_SHUTDOWN_COMPLETE: 5254 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5255 /* must be first and only chunk */ 5256 if ((num_chunks > 1) || 5257 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5258 *offset = length; 5259 if (locked_tcb) { 5260 SCTP_TCB_UNLOCK(locked_tcb); 5261 } 5262 return (NULL); 5263 } 5264 if ((stcb) && netp && *netp) { 5265 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5266 stcb, *netp); 5267 } 5268 *offset = length; 5269 return (NULL); 5270 break; 5271 case SCTP_ASCONF: 5272 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5273 /* He's alive so give him credit */ 5274 if (stcb) { 5275 if (stcb->asoc.asconf_supported == 0) { 5276 goto unknown_chunk; 5277 } 5278 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5279 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5280 stcb->asoc.overall_error_count, 5281 0, 5282 SCTP_FROM_SCTP_INPUT, 5283 __LINE__); 5284 } 5285 stcb->asoc.overall_error_count = 0; 5286 sctp_handle_asconf(m, *offset, src, 5287 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5288 asconf_cnt++; 5289 } 5290 break; 5291 case SCTP_ASCONF_ACK: 5292 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5293 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5294 /* Its not ours */ 5295 if (locked_tcb) { 5296 SCTP_TCB_UNLOCK(locked_tcb); 5297 } 5298 *offset = length; 5299 return (NULL); 5300 } 5301 if ((stcb) && netp && *netp) { 5302 if (stcb->asoc.asconf_supported == 0) { 5303 goto unknown_chunk; 5304 } 5305 /* He's alive so give him credit */ 5306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5307 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5308 stcb->asoc.overall_error_count, 5309 0, 5310 SCTP_FROM_SCTP_INPUT, 5311 __LINE__); 5312 } 5313 stcb->asoc.overall_error_count = 0; 5314 sctp_handle_asconf_ack(m, *offset, 5315 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5316 if (abort_no_unlock) 5317 return (NULL); 5318 } 5319 break; 5320 case SCTP_FORWARD_CUM_TSN: 5321 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5322 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5323 /* Its not ours */ 5324 if (locked_tcb) { 5325 SCTP_TCB_UNLOCK(locked_tcb); 5326 } 5327 *offset = length; 5328 return (NULL); 5329 } 5330 /* He's alive so give him credit */ 5331 if (stcb) { 5332 int abort_flag = 0; 5333 5334 if (stcb->asoc.prsctp_supported == 0) { 5335 goto unknown_chunk; 5336 } 5337 stcb->asoc.overall_error_count = 0; 5338 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5339 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5340 stcb->asoc.overall_error_count, 5341 0, 5342 SCTP_FROM_SCTP_INPUT, 5343 __LINE__); 5344 } 5345 *fwd_tsn_seen = 1; 5346 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5347 /* We are not interested anymore */ 5348 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5349 so = SCTP_INP_SO(inp); 5350 atomic_add_int(&stcb->asoc.refcnt, 1); 5351 SCTP_TCB_UNLOCK(stcb); 5352 SCTP_SOCKET_LOCK(so, 1); 5353 SCTP_TCB_LOCK(stcb); 5354 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5355 #endif 5356 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5357 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5358 SCTP_SOCKET_UNLOCK(so, 1); 5359 #endif 5360 *offset = length; 5361 return (NULL); 5362 } 5363 sctp_handle_forward_tsn(stcb, 5364 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5365 if (abort_flag) { 5366 *offset = length; 5367 return (NULL); 5368 } else { 5369 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5370 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5371 stcb->asoc.overall_error_count, 5372 0, 5373 SCTP_FROM_SCTP_INPUT, 5374 __LINE__); 5375 } 5376 stcb->asoc.overall_error_count = 0; 5377 } 5378 5379 } 5380 break; 5381 case SCTP_STREAM_RESET: 5382 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5383 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5384 /* Its not ours */ 5385 if (locked_tcb) { 5386 SCTP_TCB_UNLOCK(locked_tcb); 5387 } 5388 *offset = length; 5389 return (NULL); 5390 } 5391 if (stcb->asoc.reconfig_supported == 0) { 5392 goto unknown_chunk; 5393 } 5394 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5395 /* stop processing */ 5396 *offset = length; 5397 return (NULL); 5398 } 5399 break; 5400 case SCTP_PACKET_DROPPED: 5401 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5402 /* re-get it all please */ 5403 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5404 /* Its not ours */ 5405 if (locked_tcb) { 5406 SCTP_TCB_UNLOCK(locked_tcb); 5407 } 5408 *offset = length; 5409 return (NULL); 5410 } 5411 if (ch && (stcb) && netp && (*netp)) { 5412 if (stcb->asoc.pktdrop_supported == 0) { 5413 goto unknown_chunk; 5414 } 5415 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5416 stcb, *netp, 5417 min(chk_length, (sizeof(chunk_buf) - 4))); 5418 5419 } 5420 break; 5421 case SCTP_AUTHENTICATION: 5422 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5423 if (stcb == NULL) { 5424 /* save the first AUTH for later processing */ 5425 if (auth_skipped == 0) { 5426 auth_offset = *offset; 5427 auth_len = chk_length; 5428 auth_skipped = 1; 5429 } 5430 /* skip this chunk (temporarily) */ 5431 goto next_chunk; 5432 } 5433 if (stcb->asoc.auth_supported == 0) { 5434 goto unknown_chunk; 5435 } 5436 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5437 (chk_length > (sizeof(struct sctp_auth_chunk) + 5438 SCTP_AUTH_DIGEST_LEN_MAX))) { 5439 /* Its not ours */ 5440 if (locked_tcb) { 5441 SCTP_TCB_UNLOCK(locked_tcb); 5442 } 5443 *offset = length; 5444 return (NULL); 5445 } 5446 if (got_auth == 1) { 5447 /* skip this chunk... it's already auth'd */ 5448 goto next_chunk; 5449 } 5450 got_auth = 1; 5451 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5452 m, *offset)) { 5453 /* auth HMAC failed so dump the packet */ 5454 *offset = length; 5455 return (stcb); 5456 } else { 5457 /* remaining chunks are HMAC checked */ 5458 stcb->asoc.authenticated = 1; 5459 } 5460 break; 5461 5462 default: 5463 unknown_chunk: 5464 /* it's an unknown chunk! */ 5465 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5466 struct mbuf *mm; 5467 struct sctp_paramhdr *phd; 5468 int len; 5469 5470 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5471 0, M_NOWAIT, 1, MT_DATA); 5472 if (mm) { 5473 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5474 phd = mtod(mm, struct sctp_paramhdr *); 5475 /* 5476 * We cheat and use param type since 5477 * we did not bother to define a 5478 * error cause struct. They are the 5479 * same basic format with different 5480 * names. 5481 */ 5482 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5483 phd->param_length = htons(len + sizeof(*phd)); 5484 SCTP_BUF_LEN(mm) = sizeof(*phd); 5485 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5486 if (SCTP_BUF_NEXT(mm)) { 5487 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5488 sctp_m_freem(mm); 5489 } else { 5490 #ifdef SCTP_MBUF_LOGGING 5491 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5492 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5493 } 5494 #endif 5495 sctp_queue_op_err(stcb, mm); 5496 } 5497 } else { 5498 sctp_m_freem(mm); 5499 } 5500 } 5501 } 5502 if ((ch->chunk_type & 0x80) == 0) { 5503 /* discard this packet */ 5504 *offset = length; 5505 return (stcb); 5506 } /* else skip this bad chunk and continue... */ 5507 break; 5508 } /* switch (ch->chunk_type) */ 5509 5510 5511 next_chunk: 5512 /* get the next chunk */ 5513 *offset += SCTP_SIZE32(chk_length); 5514 if (*offset >= length) { 5515 /* no more data left in the mbuf chain */ 5516 break; 5517 } 5518 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5519 sizeof(struct sctp_chunkhdr), chunk_buf); 5520 if (ch == NULL) { 5521 if (locked_tcb) { 5522 SCTP_TCB_UNLOCK(locked_tcb); 5523 } 5524 *offset = length; 5525 return (NULL); 5526 } 5527 } /* while */ 5528 5529 if (asconf_cnt > 0 && stcb != NULL) { 5530 sctp_send_asconf_ack(stcb); 5531 } 5532 return (stcb); 5533 } 5534 5535 5536 #ifdef INVARIANTS 5537 #ifdef __GNUC__ 5538 __attribute__((noinline)) 5539 #endif 5540 void 5541 sctp_validate_no_locks(struct sctp_inpcb *inp) 5542 { 5543 struct sctp_tcb *lstcb; 5544 5545 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5546 if (mtx_owned(&lstcb->tcb_mtx)) { 5547 panic("Own lock on stcb at return from input"); 5548 } 5549 } 5550 if (mtx_owned(&inp->inp_create_mtx)) { 5551 panic("Own create lock on inp"); 5552 } 5553 if (mtx_owned(&inp->inp_mtx)) { 5554 panic("Own inp lock on inp"); 5555 } 5556 } 5557 5558 #endif 5559 5560 /* 5561 * common input chunk processing (v4 and v6) 5562 */ 5563 void 5564 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5565 struct sockaddr *src, struct sockaddr *dst, 5566 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5567 #if !defined(SCTP_WITH_NO_CSUM) 5568 uint8_t compute_crc, 5569 #endif 5570 uint8_t ecn_bits, 5571 uint8_t mflowtype, uint32_t mflowid, 5572 uint32_t vrf_id, uint16_t port) 5573 { 5574 uint32_t high_tsn; 5575 int fwd_tsn_seen = 0, data_processed = 0; 5576 struct mbuf *m = *mm, *op_err; 5577 char msg[SCTP_DIAG_INFO_LEN]; 5578 int un_sent; 5579 int cnt_ctrl_ready = 0; 5580 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5581 struct sctp_tcb *stcb = NULL; 5582 struct sctp_nets *net = NULL; 5583 5584 SCTP_STAT_INCR(sctps_recvdatagrams); 5585 #ifdef SCTP_AUDITING_ENABLED 5586 sctp_audit_log(0xE0, 1); 5587 sctp_auditing(0, inp, stcb, net); 5588 #endif 5589 #if !defined(SCTP_WITH_NO_CSUM) 5590 if (compute_crc != 0) { 5591 uint32_t check, calc_check; 5592 5593 check = sh->checksum; 5594 sh->checksum = 0; 5595 calc_check = sctp_calculate_cksum(m, iphlen); 5596 sh->checksum = check; 5597 if (calc_check != check) { 5598 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5599 calc_check, check, (void *)m, length, iphlen); 5600 stcb = sctp_findassociation_addr(m, offset, src, dst, 5601 sh, ch, &inp, &net, vrf_id); 5602 #if defined(INET) || defined(INET6) 5603 if ((net != NULL) && (port != 0)) { 5604 if (net->port == 0) { 5605 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5606 } 5607 net->port = port; 5608 } 5609 #endif 5610 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5611 net->flowtype = mflowtype; 5612 } 5613 if ((inp != NULL) && (stcb != NULL)) { 5614 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5615 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5616 } else if ((inp != NULL) && (stcb == NULL)) { 5617 inp_decr = inp; 5618 } 5619 SCTP_STAT_INCR(sctps_badsum); 5620 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5621 goto out; 5622 } 5623 } 5624 #endif 5625 /* Destination port of 0 is illegal, based on RFC4960. */ 5626 if (sh->dest_port == 0) { 5627 SCTP_STAT_INCR(sctps_hdrops); 5628 goto out; 5629 } 5630 stcb = sctp_findassociation_addr(m, offset, src, dst, 5631 sh, ch, &inp, &net, vrf_id); 5632 #if defined(INET) || defined(INET6) 5633 if ((net != NULL) && (port != 0)) { 5634 if (net->port == 0) { 5635 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5636 } 5637 net->port = port; 5638 } 5639 #endif 5640 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5641 net->flowtype = mflowtype; 5642 } 5643 if (inp == NULL) { 5644 SCTP_STAT_INCR(sctps_noport); 5645 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5646 goto out; 5647 } 5648 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5649 sctp_send_shutdown_complete2(src, dst, sh, 5650 mflowtype, mflowid, 5651 vrf_id, port); 5652 goto out; 5653 } 5654 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5655 goto out; 5656 } 5657 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5658 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5659 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5660 (ch->chunk_type != SCTP_INIT))) { 5661 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5662 "Out of the blue"); 5663 sctp_send_abort(m, iphlen, src, dst, 5664 sh, 0, op_err, 5665 mflowtype, mflowid, 5666 vrf_id, port); 5667 } 5668 } 5669 goto out; 5670 } else if (stcb == NULL) { 5671 inp_decr = inp; 5672 } 5673 #ifdef IPSEC 5674 /*- 5675 * I very much doubt any of the IPSEC stuff will work but I have no 5676 * idea, so I will leave it in place. 5677 */ 5678 if (inp != NULL) { 5679 switch (dst->sa_family) { 5680 #ifdef INET 5681 case AF_INET: 5682 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5683 SCTP_STAT_INCR(sctps_hdrops); 5684 goto out; 5685 } 5686 break; 5687 #endif 5688 #ifdef INET6 5689 case AF_INET6: 5690 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5691 SCTP_STAT_INCR(sctps_hdrops); 5692 goto out; 5693 } 5694 break; 5695 #endif 5696 default: 5697 break; 5698 } 5699 } 5700 #endif 5701 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5702 (void *)m, iphlen, offset, length, (void *)stcb); 5703 if (stcb) { 5704 /* always clear this before beginning a packet */ 5705 stcb->asoc.authenticated = 0; 5706 stcb->asoc.seen_a_sack_this_pkt = 0; 5707 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5708 (void *)stcb, stcb->asoc.state); 5709 5710 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5711 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5712 /*- 5713 * If we hit here, we had a ref count 5714 * up when the assoc was aborted and the 5715 * timer is clearing out the assoc, we should 5716 * NOT respond to any packet.. its OOTB. 5717 */ 5718 SCTP_TCB_UNLOCK(stcb); 5719 stcb = NULL; 5720 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5721 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5722 msg); 5723 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5724 mflowtype, mflowid, 5725 vrf_id, port); 5726 goto out; 5727 } 5728 } 5729 if (IS_SCTP_CONTROL(ch)) { 5730 /* process the control portion of the SCTP packet */ 5731 /* sa_ignore NO_NULL_CHK */ 5732 stcb = sctp_process_control(m, iphlen, &offset, length, 5733 src, dst, sh, ch, 5734 inp, stcb, &net, &fwd_tsn_seen, 5735 mflowtype, mflowid, 5736 vrf_id, port); 5737 if (stcb) { 5738 /* 5739 * This covers us if the cookie-echo was there and 5740 * it changes our INP. 5741 */ 5742 inp = stcb->sctp_ep; 5743 #if defined(INET) || defined(INET6) 5744 if ((net) && (port)) { 5745 if (net->port == 0) { 5746 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5747 } 5748 net->port = port; 5749 } 5750 #endif 5751 } 5752 } else { 5753 /* 5754 * no control chunks, so pre-process DATA chunks (these 5755 * checks are taken care of by control processing) 5756 */ 5757 5758 /* 5759 * if DATA only packet, and auth is required, then punt... 5760 * can't have authenticated without any AUTH (control) 5761 * chunks 5762 */ 5763 if ((stcb != NULL) && 5764 (stcb->asoc.auth_supported == 1) && 5765 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5766 /* "silently" ignore */ 5767 SCTP_STAT_INCR(sctps_recvauthmissing); 5768 goto out; 5769 } 5770 if (stcb == NULL) { 5771 /* out of the blue DATA chunk */ 5772 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5773 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5774 msg); 5775 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5776 mflowtype, mflowid, 5777 vrf_id, port); 5778 goto out; 5779 } 5780 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5781 /* v_tag mismatch! */ 5782 SCTP_STAT_INCR(sctps_badvtag); 5783 goto out; 5784 } 5785 } 5786 5787 if (stcb == NULL) { 5788 /* 5789 * no valid TCB for this packet, or we found it's a bad 5790 * packet while processing control, or we're done with this 5791 * packet (done or skip rest of data), so we drop it... 5792 */ 5793 goto out; 5794 } 5795 /* 5796 * DATA chunk processing 5797 */ 5798 /* plow through the data chunks while length > offset */ 5799 5800 /* 5801 * Rest should be DATA only. Check authentication state if AUTH for 5802 * DATA is required. 5803 */ 5804 if ((length > offset) && 5805 (stcb != NULL) && 5806 (stcb->asoc.auth_supported == 1) && 5807 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5808 !stcb->asoc.authenticated) { 5809 /* "silently" ignore */ 5810 SCTP_STAT_INCR(sctps_recvauthmissing); 5811 SCTPDBG(SCTP_DEBUG_AUTH1, 5812 "Data chunk requires AUTH, skipped\n"); 5813 goto trigger_send; 5814 } 5815 if (length > offset) { 5816 int retval; 5817 5818 /* 5819 * First check to make sure our state is correct. We would 5820 * not get here unless we really did have a tag, so we don't 5821 * abort if this happens, just dump the chunk silently. 5822 */ 5823 switch (SCTP_GET_STATE(&stcb->asoc)) { 5824 case SCTP_STATE_COOKIE_ECHOED: 5825 /* 5826 * we consider data with valid tags in this state 5827 * shows us the cookie-ack was lost. Imply it was 5828 * there. 5829 */ 5830 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5831 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5832 stcb->asoc.overall_error_count, 5833 0, 5834 SCTP_FROM_SCTP_INPUT, 5835 __LINE__); 5836 } 5837 stcb->asoc.overall_error_count = 0; 5838 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5839 break; 5840 case SCTP_STATE_COOKIE_WAIT: 5841 /* 5842 * We consider OOTB any data sent during asoc setup. 5843 */ 5844 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5845 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5846 msg); 5847 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5848 mflowtype, mflowid, 5849 vrf_id, port); 5850 goto out; 5851 /* sa_ignore NOTREACHED */ 5852 break; 5853 case SCTP_STATE_EMPTY: /* should not happen */ 5854 case SCTP_STATE_INUSE: /* should not happen */ 5855 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5856 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5857 default: 5858 goto out; 5859 /* sa_ignore NOTREACHED */ 5860 break; 5861 case SCTP_STATE_OPEN: 5862 case SCTP_STATE_SHUTDOWN_SENT: 5863 break; 5864 } 5865 /* plow through the data chunks while length > offset */ 5866 retval = sctp_process_data(mm, iphlen, &offset, length, 5867 src, dst, sh, 5868 inp, stcb, net, &high_tsn, 5869 mflowtype, mflowid, 5870 vrf_id, port); 5871 if (retval == 2) { 5872 /* 5873 * The association aborted, NO UNLOCK needed since 5874 * the association is destroyed. 5875 */ 5876 stcb = NULL; 5877 goto out; 5878 } 5879 data_processed = 1; 5880 /* 5881 * Anything important needs to have been m_copy'ed in 5882 * process_data 5883 */ 5884 } 5885 /* take care of ecn */ 5886 if ((data_processed == 1) && 5887 (stcb->asoc.ecn_supported == 1) && 5888 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5889 /* Yep, we need to add a ECNE */ 5890 sctp_send_ecn_echo(stcb, net, high_tsn); 5891 } 5892 if ((data_processed == 0) && (fwd_tsn_seen)) { 5893 int was_a_gap; 5894 uint32_t highest_tsn; 5895 5896 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5897 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5898 } else { 5899 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5900 } 5901 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5902 stcb->asoc.send_sack = 1; 5903 sctp_sack_check(stcb, was_a_gap); 5904 } else if (fwd_tsn_seen) { 5905 stcb->asoc.send_sack = 1; 5906 } 5907 /* trigger send of any chunks in queue... */ 5908 trigger_send: 5909 #ifdef SCTP_AUDITING_ENABLED 5910 sctp_audit_log(0xE0, 2); 5911 sctp_auditing(1, inp, stcb, net); 5912 #endif 5913 SCTPDBG(SCTP_DEBUG_INPUT1, 5914 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5915 stcb->asoc.peers_rwnd, 5916 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5917 stcb->asoc.total_flight); 5918 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5919 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5920 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5921 } 5922 if (cnt_ctrl_ready || 5923 ((un_sent) && 5924 (stcb->asoc.peers_rwnd > 0 || 5925 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5926 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5927 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5928 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5929 } 5930 #ifdef SCTP_AUDITING_ENABLED 5931 sctp_audit_log(0xE0, 3); 5932 sctp_auditing(2, inp, stcb, net); 5933 #endif 5934 out: 5935 if (stcb != NULL) { 5936 SCTP_TCB_UNLOCK(stcb); 5937 } 5938 if (inp_decr != NULL) { 5939 /* reduce ref-count */ 5940 SCTP_INP_WLOCK(inp_decr); 5941 SCTP_INP_DECR_REF(inp_decr); 5942 SCTP_INP_WUNLOCK(inp_decr); 5943 } 5944 #ifdef INVARIANTS 5945 if (inp != NULL) { 5946 sctp_validate_no_locks(inp); 5947 } 5948 #endif 5949 return; 5950 } 5951 5952 #ifdef INET 5953 void 5954 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5955 { 5956 struct mbuf *m; 5957 int iphlen; 5958 uint32_t vrf_id = 0; 5959 uint8_t ecn_bits; 5960 struct sockaddr_in src, dst; 5961 struct ip *ip; 5962 struct sctphdr *sh; 5963 struct sctp_chunkhdr *ch; 5964 int length, offset; 5965 5966 #if !defined(SCTP_WITH_NO_CSUM) 5967 uint8_t compute_crc; 5968 5969 #endif 5970 uint32_t mflowid; 5971 uint8_t mflowtype; 5972 5973 iphlen = off; 5974 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5975 SCTP_RELEASE_PKT(i_pak); 5976 return; 5977 } 5978 m = SCTP_HEADER_TO_CHAIN(i_pak); 5979 #ifdef SCTP_MBUF_LOGGING 5980 /* Log in any input mbufs */ 5981 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5982 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5983 } 5984 #endif 5985 #ifdef SCTP_PACKET_LOGGING 5986 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5987 sctp_packet_log(m); 5988 } 5989 #endif 5990 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5991 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5992 m->m_pkthdr.len, 5993 if_name(m->m_pkthdr.rcvif), 5994 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5995 mflowid = m->m_pkthdr.flowid; 5996 mflowtype = M_HASHTYPE_GET(m); 5997 SCTP_STAT_INCR(sctps_recvpackets); 5998 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5999 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6000 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6001 if (SCTP_BUF_LEN(m) < offset) { 6002 if ((m = m_pullup(m, offset)) == NULL) { 6003 SCTP_STAT_INCR(sctps_hdrops); 6004 return; 6005 } 6006 } 6007 ip = mtod(m, struct ip *); 6008 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6009 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6010 offset -= sizeof(struct sctp_chunkhdr); 6011 memset(&src, 0, sizeof(struct sockaddr_in)); 6012 src.sin_family = AF_INET; 6013 src.sin_len = sizeof(struct sockaddr_in); 6014 src.sin_port = sh->src_port; 6015 src.sin_addr = ip->ip_src; 6016 memset(&dst, 0, sizeof(struct sockaddr_in)); 6017 dst.sin_family = AF_INET; 6018 dst.sin_len = sizeof(struct sockaddr_in); 6019 dst.sin_port = sh->dest_port; 6020 dst.sin_addr = ip->ip_dst; 6021 length = ntohs(ip->ip_len); 6022 /* Validate mbuf chain length with IP payload length. */ 6023 if (SCTP_HEADER_LEN(m) != length) { 6024 SCTPDBG(SCTP_DEBUG_INPUT1, 6025 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6026 SCTP_STAT_INCR(sctps_hdrops); 6027 goto out; 6028 } 6029 /* SCTP does not allow broadcasts or multicasts */ 6030 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6031 goto out; 6032 } 6033 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6034 goto out; 6035 } 6036 ecn_bits = ip->ip_tos; 6037 #if defined(SCTP_WITH_NO_CSUM) 6038 SCTP_STAT_INCR(sctps_recvnocrc); 6039 #else 6040 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6041 SCTP_STAT_INCR(sctps_recvhwcrc); 6042 compute_crc = 0; 6043 } else { 6044 SCTP_STAT_INCR(sctps_recvswcrc); 6045 compute_crc = 1; 6046 } 6047 #endif 6048 sctp_common_input_processing(&m, iphlen, offset, length, 6049 (struct sockaddr *)&src, 6050 (struct sockaddr *)&dst, 6051 sh, ch, 6052 #if !defined(SCTP_WITH_NO_CSUM) 6053 compute_crc, 6054 #endif 6055 ecn_bits, 6056 mflowtype, mflowid, 6057 vrf_id, port); 6058 out: 6059 if (m) { 6060 sctp_m_freem(m); 6061 } 6062 return; 6063 } 6064 6065 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6066 extern int *sctp_cpuarry; 6067 6068 #endif 6069 6070 int 6071 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6072 { 6073 struct mbuf *m; 6074 int off; 6075 6076 m = *mp; 6077 off = *offp; 6078 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6079 if (mp_ncpus > 1) { 6080 struct ip *ip; 6081 struct sctphdr *sh; 6082 int offset; 6083 int cpu_to_use; 6084 uint32_t flowid, tag; 6085 6086 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6087 flowid = m->m_pkthdr.flowid; 6088 } else { 6089 /* 6090 * No flow id built by lower layers fix it so we 6091 * create one. 6092 */ 6093 offset = off + sizeof(struct sctphdr); 6094 if (SCTP_BUF_LEN(m) < offset) { 6095 if ((m = m_pullup(m, offset)) == NULL) { 6096 SCTP_STAT_INCR(sctps_hdrops); 6097 return (IPPROTO_DONE); 6098 } 6099 } 6100 ip = mtod(m, struct ip *); 6101 sh = (struct sctphdr *)((caddr_t)ip + off); 6102 tag = htonl(sh->v_tag); 6103 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6104 m->m_pkthdr.flowid = flowid; 6105 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6106 } 6107 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6108 sctp_queue_to_mcore(m, off, cpu_to_use); 6109 return (IPPROTO_DONE); 6110 } 6111 #endif 6112 sctp_input_with_port(m, off, 0); 6113 return (IPPROTO_DONE); 6114 } 6115 6116 #endif 6117