1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, 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 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/udp.h> 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, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88 { 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 92 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 93 stcb); 94 if (stcb == NULL) { 95 SCTP_INP_RLOCK(inp); 96 } 97 /* validate length */ 98 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 99 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 100 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 101 vrf_id, port); 102 if (stcb) 103 *abort_no_unlock = 1; 104 goto outnow; 105 } 106 /* validate parameters */ 107 init = &cp->init; 108 if (init->initiate_tag == 0) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 111 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 112 vrf_id, port); 113 if (stcb) 114 *abort_no_unlock = 1; 115 goto outnow; 116 } 117 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 118 /* invalid parameter... send abort */ 119 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 121 vrf_id, port); 122 if (stcb) 123 *abort_no_unlock = 1; 124 goto outnow; 125 } 126 if (init->num_inbound_streams == 0) { 127 /* protocol error... send abort */ 128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_outbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 138 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 139 vrf_id, port); 140 if (stcb) 141 *abort_no_unlock = 1; 142 goto outnow; 143 } 144 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 145 offset + ntohs(cp->ch.chunk_length))) { 146 /* auth parameter(s) error... send abort */ 147 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 /* 153 * We are only accepting if we have a socket with positive 154 * so_qlimit. 155 */ 156 if ((stcb == NULL) && 157 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 158 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 159 (inp->sctp_socket == NULL) || 160 (inp->sctp_socket->so_qlimit == 0))) { 161 /* 162 * FIX ME ?? What about TCP model and we have a 163 * match/restart case? Actually no fix is needed. the lookup 164 * will always find the existing assoc so stcb would not be 165 * NULL. It may be questionable to do this since we COULD 166 * just send back the INIT-ACK and hope that the app did 167 * accept()'s by the time the COOKIE was sent. But there is 168 * a price to pay for COOKIE generation and I don't want to 169 * pay it on the chance that the app will actually do some 170 * accepts(). The App just looses and should NOT be in this 171 * state :-) 172 */ 173 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 174 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 175 } 176 goto outnow; 177 } 178 if ((stcb != NULL) && 179 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 180 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 181 sctp_send_shutdown_ack(stcb, NULL); 182 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 183 } else { 184 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 185 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 186 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 187 } 188 outnow: 189 if (stcb == NULL) { 190 SCTP_INP_RUNLOCK(inp); 191 } 192 } 193 194 /* 195 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 196 */ 197 198 int 199 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 200 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 201 SCTP_UNUSED 202 #endif 203 ) 204 { 205 int unsent_data = 0; 206 unsigned int i; 207 struct sctp_stream_queue_pending *sp; 208 struct sctp_association *asoc; 209 210 /* 211 * This function returns the number of streams that have true unsent 212 * data on them. Note that as it looks through it will clean up any 213 * places that have old data that has been sent but left at top of 214 * stream queue. 215 */ 216 asoc = &stcb->asoc; 217 SCTP_TCB_SEND_LOCK(stcb); 218 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 219 /* Check to see if some data queued */ 220 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 221 /* sa_ignore FREED_MEMORY */ 222 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 223 if (sp == NULL) { 224 continue; 225 } 226 if ((sp->msg_is_complete) && 227 (sp->length == 0) && 228 (sp->sender_all_done)) { 229 /* 230 * We are doing differed cleanup. Last time 231 * through when we took all the data the 232 * sender_all_done was not set. 233 */ 234 if (sp->put_last_out == 0) { 235 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 236 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 237 sp->sender_all_done, 238 sp->length, 239 sp->msg_is_complete, 240 sp->put_last_out); 241 } 242 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 243 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 244 if (sp->net) { 245 sctp_free_remote_addr(sp->net); 246 sp->net = NULL; 247 } 248 if (sp->data) { 249 sctp_m_freem(sp->data); 250 sp->data = NULL; 251 } 252 sctp_free_a_strmoq(stcb, sp, so_locked); 253 } else { 254 unsent_data++; 255 break; 256 } 257 } 258 } 259 SCTP_TCB_SEND_UNLOCK(stcb); 260 return (unsent_data); 261 } 262 263 static int 264 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 265 { 266 struct sctp_init *init; 267 struct sctp_association *asoc; 268 struct sctp_nets *lnet; 269 unsigned int i; 270 271 init = &cp->init; 272 asoc = &stcb->asoc; 273 /* save off parameters */ 274 asoc->peer_vtag = ntohl(init->initiate_tag); 275 asoc->peers_rwnd = ntohl(init->a_rwnd); 276 /* init tsn's */ 277 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 278 279 if (!TAILQ_EMPTY(&asoc->nets)) { 280 /* update any ssthresh's that may have a default */ 281 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 282 lnet->ssthresh = asoc->peers_rwnd; 283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 284 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 285 } 286 } 287 } 288 SCTP_TCB_SEND_LOCK(stcb); 289 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 290 unsigned int newcnt; 291 struct sctp_stream_out *outs; 292 struct sctp_stream_queue_pending *sp, *nsp; 293 struct sctp_tmit_chunk *chk, *nchk; 294 295 /* abandon the upper streams */ 296 newcnt = ntohs(init->num_inbound_streams); 297 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 298 if (chk->rec.data.stream_number >= newcnt) { 299 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 300 asoc->send_queue_cnt--; 301 if (chk->data != NULL) { 302 sctp_free_bufspace(stcb, asoc, chk, 1); 303 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 304 0, chk, SCTP_SO_NOT_LOCKED); 305 if (chk->data) { 306 sctp_m_freem(chk->data); 307 chk->data = NULL; 308 } 309 } 310 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 311 /* sa_ignore FREED_MEMORY */ 312 } 313 } 314 if (asoc->strmout) { 315 for (i = newcnt; i < asoc->pre_open_streams; i++) { 316 outs = &asoc->strmout[i]; 317 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 318 TAILQ_REMOVE(&outs->outqueue, sp, next); 319 asoc->stream_queue_cnt--; 320 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 321 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 322 if (sp->data) { 323 sctp_m_freem(sp->data); 324 sp->data = NULL; 325 } 326 if (sp->net) { 327 sctp_free_remote_addr(sp->net); 328 sp->net = NULL; 329 } 330 /* Free the chunk */ 331 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 332 /* sa_ignore FREED_MEMORY */ 333 } 334 } 335 } 336 /* cut back the count */ 337 asoc->pre_open_streams = newcnt; 338 } 339 SCTP_TCB_SEND_UNLOCK(stcb); 340 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 341 342 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 343 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 344 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 345 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 346 } 347 /* This is the next one we expect */ 348 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 349 350 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 351 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 352 353 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 354 /* open the requested streams */ 355 356 if (asoc->strmin != NULL) { 357 /* Free the old ones */ 358 struct sctp_queued_to_read *ctl, *nctl; 359 360 for (i = 0; i < asoc->streamincnt; i++) { 361 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 362 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 363 sctp_free_remote_addr(ctl->whoFrom); 364 ctl->whoFrom = NULL; 365 sctp_m_freem(ctl->data); 366 ctl->data = NULL; 367 sctp_free_a_readq(stcb, ctl); 368 } 369 } 370 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 371 } 372 asoc->streamincnt = ntohs(init->num_outbound_streams); 373 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 374 asoc->streamincnt = MAX_SCTP_STREAMS; 375 } 376 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 377 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 378 if (asoc->strmin == NULL) { 379 /* we didn't get memory for the streams! */ 380 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 381 return (-1); 382 } 383 for (i = 0; i < asoc->streamincnt; i++) { 384 asoc->strmin[i].stream_no = i; 385 asoc->strmin[i].last_sequence_delivered = 0xffff; 386 /* 387 * U-stream ranges will be set when the cookie is unpacked. 388 * Or for the INIT sender they are un set (if pr-sctp not 389 * supported) when the INIT-ACK arrives. 390 */ 391 TAILQ_INIT(&asoc->strmin[i].inqueue); 392 asoc->strmin[i].delivery_started = 0; 393 } 394 /* 395 * load_address_from_init will put the addresses into the 396 * association when the COOKIE is processed or the INIT-ACK is 397 * processed. Both types of COOKIE's existing and new call this 398 * routine. It will remove addresses that are no longer in the 399 * association (for the restarting case where addresses are 400 * removed). Up front when the INIT arrives we will discard it if it 401 * is a restart and new addresses have been added. 402 */ 403 /* sa_ignore MEMLEAK */ 404 return (0); 405 } 406 407 /* 408 * INIT-ACK message processing/consumption returns value < 0 on error 409 */ 410 static int 411 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 412 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 413 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 414 { 415 struct sctp_association *asoc; 416 struct mbuf *op_err; 417 int retval, abort_flag; 418 uint32_t initack_limit; 419 int nat_friendly = 0; 420 421 /* First verify that we have no illegal param's */ 422 abort_flag = 0; 423 op_err = NULL; 424 425 op_err = sctp_arethere_unrecognized_parameters(m, 426 (offset + sizeof(struct sctp_init_chunk)), 427 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 428 if (abort_flag) { 429 /* Send an abort and notify peer */ 430 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 431 *abort_no_unlock = 1; 432 return (-1); 433 } 434 asoc = &stcb->asoc; 435 asoc->peer_supports_nat = (uint8_t) nat_friendly; 436 /* process the peer's parameters in the INIT-ACK */ 437 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 438 if (retval < 0) { 439 return (retval); 440 } 441 initack_limit = offset + ntohs(cp->ch.chunk_length); 442 /* load all addresses */ 443 if ((retval = sctp_load_addresses_from_init(stcb, m, 444 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 445 NULL))) { 446 /* Huh, we should abort */ 447 SCTPDBG(SCTP_DEBUG_INPUT1, 448 "Load addresses from INIT causes an abort %d\n", 449 retval); 450 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 451 NULL, 0, net->port); 452 *abort_no_unlock = 1; 453 return (-1); 454 } 455 /* if the peer doesn't support asconf, flush the asconf queue */ 456 if (asoc->peer_supports_asconf == 0) { 457 struct sctp_asconf_addr *param, *nparam; 458 459 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 460 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 461 SCTP_FREE(param, SCTP_M_ASC_ADDR); 462 } 463 } 464 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 465 stcb->asoc.local_hmacs); 466 if (op_err) { 467 sctp_queue_op_err(stcb, op_err); 468 /* queuing will steal away the mbuf chain to the out queue */ 469 op_err = NULL; 470 } 471 /* extract the cookie and queue it to "echo" it back... */ 472 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 473 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 474 stcb->asoc.overall_error_count, 475 0, 476 SCTP_FROM_SCTP_INPUT, 477 __LINE__); 478 } 479 stcb->asoc.overall_error_count = 0; 480 net->error_count = 0; 481 482 /* 483 * Cancel the INIT timer, We do this first before queueing the 484 * cookie. We always cancel at the primary to assue that we are 485 * canceling the timer started by the INIT which always goes to the 486 * primary. 487 */ 488 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 489 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 490 491 /* calculate the RTO */ 492 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 493 SCTP_RTT_FROM_NON_DATA); 494 495 retval = sctp_send_cookie_echo(m, offset, stcb, net); 496 if (retval < 0) { 497 /* 498 * No cookie, we probably should send a op error. But in any 499 * case if there is no cookie in the INIT-ACK, we can 500 * abandon the peer, its broke. 501 */ 502 if (retval == -3) { 503 /* We abort with an error of missing mandatory param */ 504 op_err = 505 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 506 if (op_err) { 507 /* 508 * Expand beyond to include the mandatory 509 * param cookie 510 */ 511 struct sctp_inv_mandatory_param *mp; 512 513 SCTP_BUF_LEN(op_err) = 514 sizeof(struct sctp_inv_mandatory_param); 515 mp = mtod(op_err, 516 struct sctp_inv_mandatory_param *); 517 /* Subtract the reserved param */ 518 mp->length = 519 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 520 mp->num_param = htonl(1); 521 mp->param = htons(SCTP_STATE_COOKIE); 522 mp->resv = 0; 523 } 524 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 525 sh, op_err, vrf_id, net->port); 526 *abort_no_unlock = 1; 527 } 528 return (retval); 529 } 530 return (0); 531 } 532 533 static void 534 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 535 struct sctp_tcb *stcb, struct sctp_nets *net) 536 { 537 struct sockaddr_storage store; 538 struct sctp_nets *r_net, *f_net; 539 struct timeval tv; 540 int req_prim = 0; 541 uint16_t old_error_counter; 542 543 #ifdef INET 544 struct sockaddr_in *sin; 545 546 #endif 547 #ifdef INET6 548 struct sockaddr_in6 *sin6; 549 550 #endif 551 552 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 553 /* Invalid length */ 554 return; 555 } 556 memset(&store, 0, sizeof(store)); 557 switch (cp->heartbeat.hb_info.addr_family) { 558 #ifdef INET 559 case AF_INET: 560 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 561 sin = (struct sockaddr_in *)&store; 562 sin->sin_family = cp->heartbeat.hb_info.addr_family; 563 sin->sin_len = cp->heartbeat.hb_info.addr_len; 564 sin->sin_port = stcb->rport; 565 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 566 sizeof(sin->sin_addr)); 567 } else { 568 return; 569 } 570 break; 571 #endif 572 #ifdef INET6 573 case AF_INET6: 574 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 575 sin6 = (struct sockaddr_in6 *)&store; 576 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 577 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 578 sin6->sin6_port = stcb->rport; 579 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 580 sizeof(sin6->sin6_addr)); 581 } else { 582 return; 583 } 584 break; 585 #endif 586 default: 587 return; 588 } 589 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 590 if (r_net == NULL) { 591 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 592 return; 593 } 594 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 595 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 596 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 597 /* 598 * If the its a HB and it's random value is correct when can 599 * confirm the destination. 600 */ 601 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 602 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 603 stcb->asoc.primary_destination = r_net; 604 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 605 f_net = TAILQ_FIRST(&stcb->asoc.nets); 606 if (f_net != r_net) { 607 /* 608 * first one on the list is NOT the primary 609 * sctp_cmpaddr() is much more efficent if 610 * the primary is the first on the list, 611 * make it so. 612 */ 613 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 614 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 615 } 616 req_prim = 1; 617 } 618 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 619 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 620 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 621 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 622 } 623 old_error_counter = r_net->error_count; 624 r_net->error_count = 0; 625 r_net->hb_responded = 1; 626 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 627 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 628 /* Now lets do a RTO with this */ 629 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 630 SCTP_RTT_FROM_NON_DATA); 631 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 632 r_net->dest_state |= SCTP_ADDR_REACHABLE; 633 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 634 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 635 } 636 if (r_net->dest_state & SCTP_ADDR_PF) { 637 r_net->dest_state &= ~SCTP_ADDR_PF; 638 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 639 } 640 if (old_error_counter > 0) { 641 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 642 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 643 } 644 if (r_net == stcb->asoc.primary_destination) { 645 if (stcb->asoc.alternate) { 646 /* release the alternate, primary is good */ 647 sctp_free_remote_addr(stcb->asoc.alternate); 648 stcb->asoc.alternate = NULL; 649 } 650 } 651 /* Mobility adaptation */ 652 if (req_prim) { 653 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_BASE) || 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_FASTHANDOFF)) && 657 sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_PRIM_DELETED)) { 659 660 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 661 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 662 SCTP_MOBILITY_FASTHANDOFF)) { 663 sctp_assoc_immediate_retrans(stcb, 664 stcb->asoc.primary_destination); 665 } 666 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 667 SCTP_MOBILITY_BASE)) { 668 sctp_move_chunks_from_net(stcb, 669 stcb->asoc.deleted_primary); 670 } 671 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 672 stcb->asoc.deleted_primary); 673 } 674 } 675 } 676 677 static int 678 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 679 { 680 /* 681 * return 0 means we want you to proceed with the abort non-zero 682 * means no abort processing 683 */ 684 struct sctpasochead *head; 685 686 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 687 /* generate a new vtag and send init */ 688 LIST_REMOVE(stcb, sctp_asocs); 689 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 690 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 691 /* 692 * put it in the bucket in the vtag hash of assoc's for the 693 * system 694 */ 695 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 696 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 697 return (1); 698 } 699 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 700 /* 701 * treat like a case where the cookie expired i.e.: - dump 702 * current cookie. - generate a new vtag. - resend init. 703 */ 704 /* generate a new vtag and send init */ 705 LIST_REMOVE(stcb, sctp_asocs); 706 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 707 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 708 sctp_stop_all_cookie_timers(stcb); 709 sctp_toss_old_cookies(stcb, &stcb->asoc); 710 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 711 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 712 /* 713 * put it in the bucket in the vtag hash of assoc's for the 714 * system 715 */ 716 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 717 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 718 return (1); 719 } 720 return (0); 721 } 722 723 static int 724 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 725 struct sctp_nets *net) 726 { 727 /* 728 * return 0 means we want you to proceed with the abort non-zero 729 * means no abort processing 730 */ 731 if (stcb->asoc.peer_supports_auth == 0) { 732 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 733 return (0); 734 } 735 sctp_asconf_send_nat_state_update(stcb, net); 736 return (1); 737 } 738 739 740 static void 741 sctp_handle_abort(struct sctp_abort_chunk *abort, 742 struct sctp_tcb *stcb, struct sctp_nets *net) 743 { 744 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 745 struct socket *so; 746 747 #endif 748 uint16_t len; 749 uint16_t error; 750 751 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 752 if (stcb == NULL) 753 return; 754 755 len = ntohs(abort->ch.chunk_length); 756 if (len > sizeof(struct sctp_chunkhdr)) { 757 /* 758 * Need to check the cause codes for our two magic nat 759 * aborts which don't kill the assoc necessarily. 760 */ 761 struct sctp_missing_nat_state *natc; 762 763 natc = (struct sctp_missing_nat_state *)(abort + 1); 764 error = ntohs(natc->cause); 765 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 766 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 767 abort->ch.chunk_flags); 768 if (sctp_handle_nat_colliding_state(stcb)) { 769 return; 770 } 771 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 772 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 773 abort->ch.chunk_flags); 774 if (sctp_handle_nat_missing_state(stcb, net)) { 775 return; 776 } 777 } 778 } else { 779 error = 0; 780 } 781 /* stop any receive timers */ 782 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 783 /* notify user of the abort and clean up... */ 784 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 785 /* free the tcb */ 786 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 787 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 788 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 789 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 790 } 791 #ifdef SCTP_ASOCLOG_OF_TSNS 792 sctp_print_out_track_log(stcb); 793 #endif 794 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 795 so = SCTP_INP_SO(stcb->sctp_ep); 796 atomic_add_int(&stcb->asoc.refcnt, 1); 797 SCTP_TCB_UNLOCK(stcb); 798 SCTP_SOCKET_LOCK(so, 1); 799 SCTP_TCB_LOCK(stcb); 800 atomic_subtract_int(&stcb->asoc.refcnt, 1); 801 #endif 802 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 803 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 804 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 805 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 SCTP_SOCKET_UNLOCK(so, 1); 807 #endif 808 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 809 } 810 811 static void 812 sctp_start_net_timers(struct sctp_tcb *stcb) 813 { 814 uint32_t cnt_hb_sent; 815 struct sctp_nets *net; 816 817 cnt_hb_sent = 0; 818 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 819 /* 820 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 821 * If the dest in unconfirmed send a hb as well if under 822 * max_hb_burst have been sent. 823 */ 824 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 825 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 826 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 827 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 828 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 829 cnt_hb_sent++; 830 } 831 } 832 if (cnt_hb_sent) { 833 sctp_chunk_output(stcb->sctp_ep, stcb, 834 SCTP_OUTPUT_FROM_COOKIE_ACK, 835 SCTP_SO_NOT_LOCKED); 836 } 837 } 838 839 840 static void 841 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 842 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 843 { 844 struct sctp_association *asoc; 845 int some_on_streamwheel; 846 847 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 848 struct socket *so; 849 850 #endif 851 852 SCTPDBG(SCTP_DEBUG_INPUT2, 853 "sctp_handle_shutdown: handling SHUTDOWN\n"); 854 if (stcb == NULL) 855 return; 856 asoc = &stcb->asoc; 857 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 858 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 859 return; 860 } 861 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 862 /* Shutdown NOT the expected size */ 863 return; 864 } else { 865 sctp_update_acked(stcb, cp, abort_flag); 866 if (*abort_flag) { 867 return; 868 } 869 } 870 if (asoc->control_pdapi) { 871 /* 872 * With a normal shutdown we assume the end of last record. 873 */ 874 SCTP_INP_READ_LOCK(stcb->sctp_ep); 875 asoc->control_pdapi->end_added = 1; 876 asoc->control_pdapi->pdapi_aborted = 1; 877 asoc->control_pdapi = NULL; 878 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 879 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 880 so = SCTP_INP_SO(stcb->sctp_ep); 881 atomic_add_int(&stcb->asoc.refcnt, 1); 882 SCTP_TCB_UNLOCK(stcb); 883 SCTP_SOCKET_LOCK(so, 1); 884 SCTP_TCB_LOCK(stcb); 885 atomic_subtract_int(&stcb->asoc.refcnt, 1); 886 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 887 /* assoc was freed while we were unlocked */ 888 SCTP_SOCKET_UNLOCK(so, 1); 889 return; 890 } 891 #endif 892 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 893 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 894 SCTP_SOCKET_UNLOCK(so, 1); 895 #endif 896 } 897 /* goto SHUTDOWN_RECEIVED state to block new requests */ 898 if (stcb->sctp_socket) { 899 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 900 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 901 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 902 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 903 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 904 /* 905 * notify upper layer that peer has initiated a 906 * shutdown 907 */ 908 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 909 910 /* reset time */ 911 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 912 } 913 } 914 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 915 /* 916 * stop the shutdown timer, since we WILL move to 917 * SHUTDOWN-ACK-SENT. 918 */ 919 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 920 } 921 /* Now is there unsent data on a stream somewhere? */ 922 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 923 924 if (!TAILQ_EMPTY(&asoc->send_queue) || 925 !TAILQ_EMPTY(&asoc->sent_queue) || 926 some_on_streamwheel) { 927 /* By returning we will push more data out */ 928 return; 929 } else { 930 /* no outstanding data to send, so move on... */ 931 /* send SHUTDOWN-ACK */ 932 sctp_send_shutdown_ack(stcb, net); 933 /* move to SHUTDOWN-ACK-SENT state */ 934 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 935 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 936 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 937 } 938 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 939 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 940 sctp_stop_timers_for_shutdown(stcb); 941 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 942 stcb, net); 943 } 944 } 945 946 static void 947 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 948 struct sctp_tcb *stcb, 949 struct sctp_nets *net) 950 { 951 struct sctp_association *asoc; 952 953 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 954 struct socket *so; 955 956 so = SCTP_INP_SO(stcb->sctp_ep); 957 #endif 958 SCTPDBG(SCTP_DEBUG_INPUT2, 959 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 960 if (stcb == NULL) 961 return; 962 963 asoc = &stcb->asoc; 964 /* process according to association state */ 965 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 966 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 967 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 968 sctp_send_shutdown_complete(stcb, net, 1); 969 SCTP_TCB_UNLOCK(stcb); 970 return; 971 } 972 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 973 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 974 /* unexpected SHUTDOWN-ACK... so ignore... */ 975 SCTP_TCB_UNLOCK(stcb); 976 return; 977 } 978 if (asoc->control_pdapi) { 979 /* 980 * With a normal shutdown we assume the end of last record. 981 */ 982 SCTP_INP_READ_LOCK(stcb->sctp_ep); 983 asoc->control_pdapi->end_added = 1; 984 asoc->control_pdapi->pdapi_aborted = 1; 985 asoc->control_pdapi = NULL; 986 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 987 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 988 atomic_add_int(&stcb->asoc.refcnt, 1); 989 SCTP_TCB_UNLOCK(stcb); 990 SCTP_SOCKET_LOCK(so, 1); 991 SCTP_TCB_LOCK(stcb); 992 atomic_subtract_int(&stcb->asoc.refcnt, 1); 993 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 994 /* assoc was freed while we were unlocked */ 995 SCTP_SOCKET_UNLOCK(so, 1); 996 return; 997 } 998 #endif 999 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1000 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1001 SCTP_SOCKET_UNLOCK(so, 1); 1002 #endif 1003 } 1004 /* are the queues empty? */ 1005 if (!TAILQ_EMPTY(&asoc->send_queue) || 1006 !TAILQ_EMPTY(&asoc->sent_queue) || 1007 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1008 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1009 } 1010 /* stop the timer */ 1011 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1012 /* send SHUTDOWN-COMPLETE */ 1013 sctp_send_shutdown_complete(stcb, net, 0); 1014 /* notify upper layer protocol */ 1015 if (stcb->sctp_socket) { 1016 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1017 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1018 stcb->sctp_socket->so_snd.sb_cc = 0; 1019 } 1020 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1021 } 1022 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1023 /* free the TCB but first save off the ep */ 1024 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1025 atomic_add_int(&stcb->asoc.refcnt, 1); 1026 SCTP_TCB_UNLOCK(stcb); 1027 SCTP_SOCKET_LOCK(so, 1); 1028 SCTP_TCB_LOCK(stcb); 1029 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1030 #endif 1031 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1032 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1033 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1034 SCTP_SOCKET_UNLOCK(so, 1); 1035 #endif 1036 } 1037 1038 /* 1039 * Skip past the param header and then we will find the chunk that caused the 1040 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1041 * our peer must be broken. 1042 */ 1043 static void 1044 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1045 struct sctp_nets *net) 1046 { 1047 struct sctp_chunkhdr *chk; 1048 1049 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1050 switch (chk->chunk_type) { 1051 case SCTP_ASCONF_ACK: 1052 case SCTP_ASCONF: 1053 sctp_asconf_cleanup(stcb, net); 1054 break; 1055 case SCTP_FORWARD_CUM_TSN: 1056 stcb->asoc.peer_supports_prsctp = 0; 1057 break; 1058 default: 1059 SCTPDBG(SCTP_DEBUG_INPUT2, 1060 "Peer does not support chunk type %d(%x)??\n", 1061 chk->chunk_type, (uint32_t) chk->chunk_type); 1062 break; 1063 } 1064 } 1065 1066 /* 1067 * Skip past the param header and then we will find the param that caused the 1068 * problem. There are a number of param's in a ASCONF OR the prsctp param 1069 * these will turn of specific features. 1070 */ 1071 static void 1072 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1073 { 1074 struct sctp_paramhdr *pbad; 1075 1076 pbad = phdr + 1; 1077 switch (ntohs(pbad->param_type)) { 1078 /* pr-sctp draft */ 1079 case SCTP_PRSCTP_SUPPORTED: 1080 stcb->asoc.peer_supports_prsctp = 0; 1081 break; 1082 case SCTP_SUPPORTED_CHUNK_EXT: 1083 break; 1084 /* draft-ietf-tsvwg-addip-sctp */ 1085 case SCTP_HAS_NAT_SUPPORT: 1086 stcb->asoc.peer_supports_nat = 0; 1087 break; 1088 case SCTP_ADD_IP_ADDRESS: 1089 case SCTP_DEL_IP_ADDRESS: 1090 case SCTP_SET_PRIM_ADDR: 1091 stcb->asoc.peer_supports_asconf = 0; 1092 break; 1093 case SCTP_SUCCESS_REPORT: 1094 case SCTP_ERROR_CAUSE_IND: 1095 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1096 SCTPDBG(SCTP_DEBUG_INPUT2, 1097 "Turning off ASCONF to this strange peer\n"); 1098 stcb->asoc.peer_supports_asconf = 0; 1099 break; 1100 default: 1101 SCTPDBG(SCTP_DEBUG_INPUT2, 1102 "Peer does not support param type %d(%x)??\n", 1103 pbad->param_type, (uint32_t) pbad->param_type); 1104 break; 1105 } 1106 } 1107 1108 static int 1109 sctp_handle_error(struct sctp_chunkhdr *ch, 1110 struct sctp_tcb *stcb, struct sctp_nets *net) 1111 { 1112 int chklen; 1113 struct sctp_paramhdr *phdr; 1114 uint16_t error, error_type; 1115 uint16_t error_len; 1116 struct sctp_association *asoc; 1117 int adjust; 1118 1119 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1120 struct socket *so; 1121 1122 #endif 1123 1124 /* parse through all of the errors and process */ 1125 asoc = &stcb->asoc; 1126 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1127 sizeof(struct sctp_chunkhdr)); 1128 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1129 error = 0; 1130 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1131 /* Process an Error Cause */ 1132 error_type = ntohs(phdr->param_type); 1133 error_len = ntohs(phdr->param_length); 1134 if ((error_len > chklen) || (error_len == 0)) { 1135 /* invalid param length for this param */ 1136 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1137 chklen, error_len); 1138 return (0); 1139 } 1140 if (error == 0) { 1141 /* report the first error cause */ 1142 error = error_type; 1143 } 1144 switch (error_type) { 1145 case SCTP_CAUSE_INVALID_STREAM: 1146 case SCTP_CAUSE_MISSING_PARAM: 1147 case SCTP_CAUSE_INVALID_PARAM: 1148 case SCTP_CAUSE_NO_USER_DATA: 1149 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1150 error_type); 1151 break; 1152 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1153 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1154 ch->chunk_flags); 1155 if (sctp_handle_nat_colliding_state(stcb)) { 1156 return (0); 1157 } 1158 break; 1159 case SCTP_CAUSE_NAT_MISSING_STATE: 1160 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1161 ch->chunk_flags); 1162 if (sctp_handle_nat_missing_state(stcb, net)) { 1163 return (0); 1164 } 1165 break; 1166 case SCTP_CAUSE_STALE_COOKIE: 1167 /* 1168 * We only act if we have echoed a cookie and are 1169 * waiting. 1170 */ 1171 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1172 int *p; 1173 1174 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1175 /* Save the time doubled */ 1176 asoc->cookie_preserve_req = ntohl(*p) << 1; 1177 asoc->stale_cookie_count++; 1178 if (asoc->stale_cookie_count > 1179 asoc->max_init_times) { 1180 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1181 /* now free the asoc */ 1182 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1183 so = SCTP_INP_SO(stcb->sctp_ep); 1184 atomic_add_int(&stcb->asoc.refcnt, 1); 1185 SCTP_TCB_UNLOCK(stcb); 1186 SCTP_SOCKET_LOCK(so, 1); 1187 SCTP_TCB_LOCK(stcb); 1188 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1189 #endif 1190 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1191 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1192 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1193 SCTP_SOCKET_UNLOCK(so, 1); 1194 #endif 1195 return (-1); 1196 } 1197 /* blast back to INIT state */ 1198 sctp_toss_old_cookies(stcb, &stcb->asoc); 1199 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1200 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1201 sctp_stop_all_cookie_timers(stcb); 1202 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1203 } 1204 break; 1205 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1206 /* 1207 * Nothing we can do here, we don't do hostname 1208 * addresses so if the peer does not like my IPv6 1209 * (or IPv4 for that matter) it does not matter. If 1210 * they don't support that type of address, they can 1211 * NOT possibly get that packet type... i.e. with no 1212 * IPv6 you can't recieve a IPv6 packet. so we can 1213 * safely ignore this one. If we ever added support 1214 * for HOSTNAME Addresses, then we would need to do 1215 * something here. 1216 */ 1217 break; 1218 case SCTP_CAUSE_UNRECOG_CHUNK: 1219 sctp_process_unrecog_chunk(stcb, phdr, net); 1220 break; 1221 case SCTP_CAUSE_UNRECOG_PARAM: 1222 sctp_process_unrecog_param(stcb, phdr); 1223 break; 1224 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1225 /* 1226 * We ignore this since the timer will drive out a 1227 * new cookie anyway and there timer will drive us 1228 * to send a SHUTDOWN_COMPLETE. We can't send one 1229 * here since we don't have their tag. 1230 */ 1231 break; 1232 case SCTP_CAUSE_DELETING_LAST_ADDR: 1233 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1234 case SCTP_CAUSE_DELETING_SRC_ADDR: 1235 /* 1236 * We should NOT get these here, but in a 1237 * ASCONF-ACK. 1238 */ 1239 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1240 error_type); 1241 break; 1242 case SCTP_CAUSE_OUT_OF_RESC: 1243 /* 1244 * And what, pray tell do we do with the fact that 1245 * the peer is out of resources? Not really sure we 1246 * could do anything but abort. I suspect this 1247 * should have came WITH an abort instead of in a 1248 * OP-ERROR. 1249 */ 1250 break; 1251 default: 1252 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1253 error_type); 1254 break; 1255 } 1256 adjust = SCTP_SIZE32(error_len); 1257 chklen -= adjust; 1258 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1259 } 1260 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1261 return (0); 1262 } 1263 1264 static int 1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1266 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1267 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1268 { 1269 struct sctp_init_ack *init_ack; 1270 struct mbuf *op_err; 1271 1272 SCTPDBG(SCTP_DEBUG_INPUT2, 1273 "sctp_handle_init_ack: handling INIT-ACK\n"); 1274 1275 if (stcb == NULL) { 1276 SCTPDBG(SCTP_DEBUG_INPUT2, 1277 "sctp_handle_init_ack: TCB is null\n"); 1278 return (-1); 1279 } 1280 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1281 /* Invalid length */ 1282 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1283 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1284 op_err, 0, net->port); 1285 *abort_no_unlock = 1; 1286 return (-1); 1287 } 1288 init_ack = &cp->init; 1289 /* validate parameters */ 1290 if (init_ack->initiate_tag == 0) { 1291 /* protocol error... send an abort */ 1292 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1293 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1294 op_err, 0, net->port); 1295 *abort_no_unlock = 1; 1296 return (-1); 1297 } 1298 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1299 /* protocol error... send an abort */ 1300 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1301 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1302 op_err, 0, net->port); 1303 *abort_no_unlock = 1; 1304 return (-1); 1305 } 1306 if (init_ack->num_inbound_streams == 0) { 1307 /* protocol error... send an abort */ 1308 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1309 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1310 op_err, 0, net->port); 1311 *abort_no_unlock = 1; 1312 return (-1); 1313 } 1314 if (init_ack->num_outbound_streams == 0) { 1315 /* protocol error... send an abort */ 1316 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1317 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1318 op_err, 0, net->port); 1319 *abort_no_unlock = 1; 1320 return (-1); 1321 } 1322 /* process according to association state... */ 1323 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1324 case SCTP_STATE_COOKIE_WAIT: 1325 /* this is the expected state for this chunk */ 1326 /* process the INIT-ACK parameters */ 1327 if (stcb->asoc.primary_destination->dest_state & 1328 SCTP_ADDR_UNCONFIRMED) { 1329 /* 1330 * The primary is where we sent the INIT, we can 1331 * always consider it confirmed when the INIT-ACK is 1332 * returned. Do this before we load addresses 1333 * though. 1334 */ 1335 stcb->asoc.primary_destination->dest_state &= 1336 ~SCTP_ADDR_UNCONFIRMED; 1337 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1338 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1339 } 1340 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1341 net, abort_no_unlock, vrf_id) < 0) { 1342 /* error in parsing parameters */ 1343 return (-1); 1344 } 1345 /* update our state */ 1346 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1347 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1348 1349 /* reset the RTO calc */ 1350 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1351 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1352 stcb->asoc.overall_error_count, 1353 0, 1354 SCTP_FROM_SCTP_INPUT, 1355 __LINE__); 1356 } 1357 stcb->asoc.overall_error_count = 0; 1358 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1359 /* 1360 * collapse the init timer back in case of a exponential 1361 * backoff 1362 */ 1363 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1364 stcb, net); 1365 /* 1366 * the send at the end of the inbound data processing will 1367 * cause the cookie to be sent 1368 */ 1369 break; 1370 case SCTP_STATE_SHUTDOWN_SENT: 1371 /* incorrect state... discard */ 1372 break; 1373 case SCTP_STATE_COOKIE_ECHOED: 1374 /* incorrect state... discard */ 1375 break; 1376 case SCTP_STATE_OPEN: 1377 /* incorrect state... discard */ 1378 break; 1379 case SCTP_STATE_EMPTY: 1380 case SCTP_STATE_INUSE: 1381 default: 1382 /* incorrect state... discard */ 1383 return (-1); 1384 break; 1385 } 1386 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1387 return (0); 1388 } 1389 1390 static struct sctp_tcb * 1391 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1392 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1393 struct sctp_inpcb *inp, struct sctp_nets **netp, 1394 struct sockaddr *init_src, int *notification, 1395 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1396 uint32_t vrf_id, uint16_t port); 1397 1398 1399 /* 1400 * handle a state cookie for an existing association m: input packet mbuf 1401 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1402 * "split" mbuf and the cookie signature does not exist offset: offset into 1403 * mbuf to the cookie-echo chunk 1404 */ 1405 static struct sctp_tcb * 1406 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1407 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1408 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1409 struct sockaddr *init_src, int *notification, 1410 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1411 { 1412 struct sctp_association *asoc; 1413 struct sctp_init_chunk *init_cp, init_buf; 1414 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1415 struct sctp_nets *net; 1416 struct mbuf *op_err; 1417 struct sctp_paramhdr *ph; 1418 int init_offset, initack_offset, i; 1419 int retval; 1420 int spec_flag = 0; 1421 uint32_t how_indx; 1422 1423 net = *netp; 1424 /* I know that the TCB is non-NULL from the caller */ 1425 asoc = &stcb->asoc; 1426 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1427 if (asoc->cookie_how[how_indx] == 0) 1428 break; 1429 } 1430 if (how_indx < sizeof(asoc->cookie_how)) { 1431 asoc->cookie_how[how_indx] = 1; 1432 } 1433 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1434 /* SHUTDOWN came in after sending INIT-ACK */ 1435 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1436 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1437 0, M_DONTWAIT, 1, MT_DATA); 1438 if (op_err == NULL) { 1439 /* FOOBAR */ 1440 return (NULL); 1441 } 1442 /* Set the len */ 1443 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1444 ph = mtod(op_err, struct sctp_paramhdr *); 1445 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1446 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1447 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1448 vrf_id, net->port); 1449 if (how_indx < sizeof(asoc->cookie_how)) 1450 asoc->cookie_how[how_indx] = 2; 1451 return (NULL); 1452 } 1453 /* 1454 * find and validate the INIT chunk in the cookie (peer's info) the 1455 * INIT should start after the cookie-echo header struct (chunk 1456 * header, state cookie header struct) 1457 */ 1458 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1459 1460 init_cp = (struct sctp_init_chunk *) 1461 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1462 (uint8_t *) & init_buf); 1463 if (init_cp == NULL) { 1464 /* could not pull a INIT chunk in cookie */ 1465 return (NULL); 1466 } 1467 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1468 return (NULL); 1469 } 1470 /* 1471 * find and validate the INIT-ACK chunk in the cookie (my info) the 1472 * INIT-ACK follows the INIT chunk 1473 */ 1474 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1475 initack_cp = (struct sctp_init_ack_chunk *) 1476 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1477 (uint8_t *) & initack_buf); 1478 if (initack_cp == NULL) { 1479 /* could not pull INIT-ACK chunk in cookie */ 1480 return (NULL); 1481 } 1482 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1483 return (NULL); 1484 } 1485 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1486 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1487 /* 1488 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1489 * to get into the OPEN state 1490 */ 1491 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1492 /*- 1493 * Opps, this means that we somehow generated two vtag's 1494 * the same. I.e. we did: 1495 * Us Peer 1496 * <---INIT(tag=a)------ 1497 * ----INIT-ACK(tag=t)--> 1498 * ----INIT(tag=t)------> *1 1499 * <---INIT-ACK(tag=a)--- 1500 * <----CE(tag=t)------------- *2 1501 * 1502 * At point *1 we should be generating a different 1503 * tag t'. Which means we would throw away the CE and send 1504 * ours instead. Basically this is case C (throw away side). 1505 */ 1506 if (how_indx < sizeof(asoc->cookie_how)) 1507 asoc->cookie_how[how_indx] = 17; 1508 return (NULL); 1509 1510 } 1511 switch SCTP_GET_STATE 1512 (asoc) { 1513 case SCTP_STATE_COOKIE_WAIT: 1514 case SCTP_STATE_COOKIE_ECHOED: 1515 /* 1516 * INIT was sent but got a COOKIE_ECHO with the 1517 * correct tags... just accept it...but we must 1518 * process the init so that we can make sure we have 1519 * the right seq no's. 1520 */ 1521 /* First we must process the INIT !! */ 1522 retval = sctp_process_init(init_cp, stcb); 1523 if (retval < 0) { 1524 if (how_indx < sizeof(asoc->cookie_how)) 1525 asoc->cookie_how[how_indx] = 3; 1526 return (NULL); 1527 } 1528 /* we have already processed the INIT so no problem */ 1529 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1530 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1531 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1532 /* update current state */ 1533 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1534 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1535 else 1536 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1537 1538 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1539 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1540 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1541 stcb->sctp_ep, stcb, asoc->primary_destination); 1542 } 1543 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1544 sctp_stop_all_cookie_timers(stcb); 1545 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1546 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1547 (inp->sctp_socket->so_qlimit == 0) 1548 ) { 1549 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1550 struct socket *so; 1551 1552 #endif 1553 /* 1554 * Here is where collision would go if we 1555 * did a connect() and instead got a 1556 * init/init-ack/cookie done before the 1557 * init-ack came back.. 1558 */ 1559 stcb->sctp_ep->sctp_flags |= 1560 SCTP_PCB_FLAGS_CONNECTED; 1561 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1562 so = SCTP_INP_SO(stcb->sctp_ep); 1563 atomic_add_int(&stcb->asoc.refcnt, 1); 1564 SCTP_TCB_UNLOCK(stcb); 1565 SCTP_SOCKET_LOCK(so, 1); 1566 SCTP_TCB_LOCK(stcb); 1567 atomic_add_int(&stcb->asoc.refcnt, -1); 1568 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1569 SCTP_SOCKET_UNLOCK(so, 1); 1570 return (NULL); 1571 } 1572 #endif 1573 soisconnected(stcb->sctp_socket); 1574 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1575 SCTP_SOCKET_UNLOCK(so, 1); 1576 #endif 1577 } 1578 /* notify upper layer */ 1579 *notification = SCTP_NOTIFY_ASSOC_UP; 1580 /* 1581 * since we did not send a HB make sure we don't 1582 * double things 1583 */ 1584 net->hb_responded = 1; 1585 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1586 &cookie->time_entered, 1587 sctp_align_unsafe_makecopy, 1588 SCTP_RTT_FROM_NON_DATA); 1589 1590 if (stcb->asoc.sctp_autoclose_ticks && 1591 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1592 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1593 inp, stcb, NULL); 1594 } 1595 break; 1596 default: 1597 /* 1598 * we're in the OPEN state (or beyond), so peer must 1599 * have simply lost the COOKIE-ACK 1600 */ 1601 break; 1602 } /* end switch */ 1603 sctp_stop_all_cookie_timers(stcb); 1604 /* 1605 * We ignore the return code here.. not sure if we should 1606 * somehow abort.. but we do have an existing asoc. This 1607 * really should not fail. 1608 */ 1609 if (sctp_load_addresses_from_init(stcb, m, 1610 init_offset + sizeof(struct sctp_init_chunk), 1611 initack_offset, sh, init_src)) { 1612 if (how_indx < sizeof(asoc->cookie_how)) 1613 asoc->cookie_how[how_indx] = 4; 1614 return (NULL); 1615 } 1616 /* respond with a COOKIE-ACK */ 1617 sctp_toss_old_cookies(stcb, asoc); 1618 sctp_send_cookie_ack(stcb); 1619 if (how_indx < sizeof(asoc->cookie_how)) 1620 asoc->cookie_how[how_indx] = 5; 1621 return (stcb); 1622 } 1623 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1624 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1625 cookie->tie_tag_my_vtag == 0 && 1626 cookie->tie_tag_peer_vtag == 0) { 1627 /* 1628 * case C in Section 5.2.4 Table 2: XMOO silently discard 1629 */ 1630 if (how_indx < sizeof(asoc->cookie_how)) 1631 asoc->cookie_how[how_indx] = 6; 1632 return (NULL); 1633 } 1634 /* 1635 * If nat support, and the below and stcb is established, send back 1636 * a ABORT(colliding state) if we are established. 1637 */ 1638 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1639 (asoc->peer_supports_nat) && 1640 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1641 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1642 (asoc->peer_vtag == 0)))) { 1643 /* 1644 * Special case - Peer's support nat. We may have two init's 1645 * that we gave out the same tag on since one was not 1646 * established.. i.e. we get INIT from host-1 behind the nat 1647 * and we respond tag-a, we get a INIT from host-2 behind 1648 * the nat and we get tag-a again. Then we bring up host-1 1649 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1650 * Now we have colliding state. We must send an abort here 1651 * with colliding state indication. 1652 */ 1653 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1654 0, M_DONTWAIT, 1, MT_DATA); 1655 if (op_err == NULL) { 1656 /* FOOBAR */ 1657 return (NULL); 1658 } 1659 /* pre-reserve some space */ 1660 #ifdef INET6 1661 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1662 #else 1663 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1664 #endif 1665 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1666 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1667 /* Set the len */ 1668 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1669 ph = mtod(op_err, struct sctp_paramhdr *); 1670 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1671 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1672 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1673 return (NULL); 1674 } 1675 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1676 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1677 (asoc->peer_vtag == 0))) { 1678 /* 1679 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1680 * should be ok, re-accept peer info 1681 */ 1682 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1683 /* 1684 * Extension of case C. If we hit this, then the 1685 * random number generator returned the same vtag 1686 * when we first sent our INIT-ACK and when we later 1687 * sent our INIT. The side with the seq numbers that 1688 * are different will be the one that normnally 1689 * would have hit case C. This in effect "extends" 1690 * our vtags in this collision case to be 64 bits. 1691 * The same collision could occur aka you get both 1692 * vtag and seq number the same twice in a row.. but 1693 * is much less likely. If it did happen then we 1694 * would proceed through and bring up the assoc.. we 1695 * may end up with the wrong stream setup however.. 1696 * which would be bad.. but there is no way to 1697 * tell.. until we send on a stream that does not 1698 * exist :-) 1699 */ 1700 if (how_indx < sizeof(asoc->cookie_how)) 1701 asoc->cookie_how[how_indx] = 7; 1702 1703 return (NULL); 1704 } 1705 if (how_indx < sizeof(asoc->cookie_how)) 1706 asoc->cookie_how[how_indx] = 8; 1707 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1708 sctp_stop_all_cookie_timers(stcb); 1709 /* 1710 * since we did not send a HB make sure we don't double 1711 * things 1712 */ 1713 net->hb_responded = 1; 1714 if (stcb->asoc.sctp_autoclose_ticks && 1715 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1716 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1717 NULL); 1718 } 1719 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1720 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1721 1722 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1723 /* 1724 * Ok the peer probably discarded our data (if we 1725 * echoed a cookie+data). So anything on the 1726 * sent_queue should be marked for retransmit, we 1727 * may not get something to kick us so it COULD 1728 * still take a timeout to move these.. but it can't 1729 * hurt to mark them. 1730 */ 1731 struct sctp_tmit_chunk *chk; 1732 1733 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1734 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1735 chk->sent = SCTP_DATAGRAM_RESEND; 1736 sctp_flight_size_decrease(chk); 1737 sctp_total_flight_decrease(stcb, chk); 1738 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1739 spec_flag++; 1740 } 1741 } 1742 1743 } 1744 /* process the INIT info (peer's info) */ 1745 retval = sctp_process_init(init_cp, stcb); 1746 if (retval < 0) { 1747 if (how_indx < sizeof(asoc->cookie_how)) 1748 asoc->cookie_how[how_indx] = 9; 1749 return (NULL); 1750 } 1751 if (sctp_load_addresses_from_init(stcb, m, 1752 init_offset + sizeof(struct sctp_init_chunk), 1753 initack_offset, sh, init_src)) { 1754 if (how_indx < sizeof(asoc->cookie_how)) 1755 asoc->cookie_how[how_indx] = 10; 1756 return (NULL); 1757 } 1758 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1759 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1760 *notification = SCTP_NOTIFY_ASSOC_UP; 1761 1762 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1763 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1764 (inp->sctp_socket->so_qlimit == 0)) { 1765 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1766 struct socket *so; 1767 1768 #endif 1769 stcb->sctp_ep->sctp_flags |= 1770 SCTP_PCB_FLAGS_CONNECTED; 1771 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1772 so = SCTP_INP_SO(stcb->sctp_ep); 1773 atomic_add_int(&stcb->asoc.refcnt, 1); 1774 SCTP_TCB_UNLOCK(stcb); 1775 SCTP_SOCKET_LOCK(so, 1); 1776 SCTP_TCB_LOCK(stcb); 1777 atomic_add_int(&stcb->asoc.refcnt, -1); 1778 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1779 SCTP_SOCKET_UNLOCK(so, 1); 1780 return (NULL); 1781 } 1782 #endif 1783 soisconnected(stcb->sctp_socket); 1784 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1785 SCTP_SOCKET_UNLOCK(so, 1); 1786 #endif 1787 } 1788 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1789 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1790 else 1791 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1792 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1793 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1794 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1795 } else { 1796 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1797 } 1798 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1799 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1800 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1801 stcb->sctp_ep, stcb, asoc->primary_destination); 1802 } 1803 sctp_stop_all_cookie_timers(stcb); 1804 sctp_toss_old_cookies(stcb, asoc); 1805 sctp_send_cookie_ack(stcb); 1806 if (spec_flag) { 1807 /* 1808 * only if we have retrans set do we do this. What 1809 * this call does is get only the COOKIE-ACK out and 1810 * then when we return the normal call to 1811 * sctp_chunk_output will get the retrans out behind 1812 * this. 1813 */ 1814 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1815 } 1816 if (how_indx < sizeof(asoc->cookie_how)) 1817 asoc->cookie_how[how_indx] = 11; 1818 1819 return (stcb); 1820 } 1821 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1822 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1823 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1824 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1825 cookie->tie_tag_peer_vtag != 0) { 1826 struct sctpasochead *head; 1827 1828 if (asoc->peer_supports_nat) { 1829 /* 1830 * This is a gross gross hack. just call the 1831 * cookie_new code since we are allowing a duplicate 1832 * association. I hope this works... 1833 */ 1834 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1835 inp, netp, init_src, notification, 1836 auth_skipped, auth_offset, auth_len, 1837 vrf_id, port)); 1838 } 1839 /* 1840 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1841 */ 1842 /* temp code */ 1843 if (how_indx < sizeof(asoc->cookie_how)) 1844 asoc->cookie_how[how_indx] = 12; 1845 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1846 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1847 1848 /* notify upper layer */ 1849 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1850 atomic_add_int(&stcb->asoc.refcnt, 1); 1851 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1852 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1853 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1854 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1855 } 1856 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1857 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1858 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1859 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1860 } 1861 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1862 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1863 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1864 stcb->sctp_ep, stcb, asoc->primary_destination); 1865 1866 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1867 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1868 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1869 } 1870 asoc->pre_open_streams = 1871 ntohs(initack_cp->init.num_outbound_streams); 1872 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1873 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1874 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1875 1876 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1877 1878 asoc->str_reset_seq_in = asoc->init_seq_number; 1879 1880 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1881 if (asoc->mapping_array) { 1882 memset(asoc->mapping_array, 0, 1883 asoc->mapping_array_size); 1884 } 1885 if (asoc->nr_mapping_array) { 1886 memset(asoc->nr_mapping_array, 0, 1887 asoc->mapping_array_size); 1888 } 1889 SCTP_TCB_UNLOCK(stcb); 1890 SCTP_INP_INFO_WLOCK(); 1891 SCTP_INP_WLOCK(stcb->sctp_ep); 1892 SCTP_TCB_LOCK(stcb); 1893 atomic_add_int(&stcb->asoc.refcnt, -1); 1894 /* send up all the data */ 1895 SCTP_TCB_SEND_LOCK(stcb); 1896 1897 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1898 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1899 stcb->asoc.strmout[i].stream_no = i; 1900 stcb->asoc.strmout[i].next_sequence_sent = 0; 1901 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1902 } 1903 /* process the INIT-ACK info (my info) */ 1904 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1905 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1906 1907 /* pull from vtag hash */ 1908 LIST_REMOVE(stcb, sctp_asocs); 1909 /* re-insert to new vtag position */ 1910 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1911 SCTP_BASE_INFO(hashasocmark))]; 1912 /* 1913 * put it in the bucket in the vtag hash of assoc's for the 1914 * system 1915 */ 1916 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1917 1918 /* process the INIT info (peer's info) */ 1919 SCTP_TCB_SEND_UNLOCK(stcb); 1920 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1921 SCTP_INP_INFO_WUNLOCK(); 1922 1923 retval = sctp_process_init(init_cp, stcb); 1924 if (retval < 0) { 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 13; 1927 1928 return (NULL); 1929 } 1930 /* 1931 * since we did not send a HB make sure we don't double 1932 * things 1933 */ 1934 net->hb_responded = 1; 1935 1936 if (sctp_load_addresses_from_init(stcb, m, 1937 init_offset + sizeof(struct sctp_init_chunk), 1938 initack_offset, sh, init_src)) { 1939 if (how_indx < sizeof(asoc->cookie_how)) 1940 asoc->cookie_how[how_indx] = 14; 1941 1942 return (NULL); 1943 } 1944 /* respond with a COOKIE-ACK */ 1945 sctp_stop_all_cookie_timers(stcb); 1946 sctp_toss_old_cookies(stcb, asoc); 1947 sctp_send_cookie_ack(stcb); 1948 if (how_indx < sizeof(asoc->cookie_how)) 1949 asoc->cookie_how[how_indx] = 15; 1950 1951 return (stcb); 1952 } 1953 if (how_indx < sizeof(asoc->cookie_how)) 1954 asoc->cookie_how[how_indx] = 16; 1955 /* all other cases... */ 1956 return (NULL); 1957 } 1958 1959 1960 /* 1961 * handle a state cookie for a new association m: input packet mbuf chain-- 1962 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1963 * and the cookie signature does not exist offset: offset into mbuf to the 1964 * cookie-echo chunk length: length of the cookie chunk to: where the init 1965 * was from returns a new TCB 1966 */ 1967 struct sctp_tcb * 1968 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1969 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1970 struct sctp_inpcb *inp, struct sctp_nets **netp, 1971 struct sockaddr *init_src, int *notification, 1972 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1973 uint32_t vrf_id, uint16_t port) 1974 { 1975 struct sctp_tcb *stcb; 1976 struct sctp_init_chunk *init_cp, init_buf; 1977 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1978 struct sockaddr_storage sa_store; 1979 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1980 struct sctp_association *asoc; 1981 int init_offset, initack_offset, initack_limit; 1982 int retval; 1983 int error = 0; 1984 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1985 1986 #ifdef INET 1987 struct sockaddr_in *sin; 1988 1989 #endif 1990 #ifdef INET6 1991 struct sockaddr_in6 *sin6; 1992 1993 #endif 1994 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1995 struct socket *so; 1996 1997 so = SCTP_INP_SO(inp); 1998 #endif 1999 2000 /* 2001 * find and validate the INIT chunk in the cookie (peer's info) the 2002 * INIT should start after the cookie-echo header struct (chunk 2003 * header, state cookie header struct) 2004 */ 2005 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2006 init_cp = (struct sctp_init_chunk *) 2007 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2008 (uint8_t *) & init_buf); 2009 if (init_cp == NULL) { 2010 /* could not pull a INIT chunk in cookie */ 2011 SCTPDBG(SCTP_DEBUG_INPUT1, 2012 "process_cookie_new: could not pull INIT chunk hdr\n"); 2013 return (NULL); 2014 } 2015 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2016 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2017 return (NULL); 2018 } 2019 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2020 /* 2021 * find and validate the INIT-ACK chunk in the cookie (my info) the 2022 * INIT-ACK follows the INIT chunk 2023 */ 2024 initack_cp = (struct sctp_init_ack_chunk *) 2025 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2026 (uint8_t *) & initack_buf); 2027 if (initack_cp == NULL) { 2028 /* could not pull INIT-ACK chunk in cookie */ 2029 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2030 return (NULL); 2031 } 2032 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2033 return (NULL); 2034 } 2035 /* 2036 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2037 * "initack_limit" value. This is because the chk_length field 2038 * includes the length of the cookie, but the cookie is omitted when 2039 * the INIT and INIT_ACK are tacked onto the cookie... 2040 */ 2041 initack_limit = offset + cookie_len; 2042 2043 /* 2044 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2045 * and popluate 2046 */ 2047 2048 /* 2049 * Here we do a trick, we set in NULL for the proc/thread argument. 2050 * We do this since in effect we only use the p argument when the 2051 * socket is unbound and we must do an implicit bind. Since we are 2052 * getting a cookie, we cannot be unbound. 2053 */ 2054 stcb = sctp_aloc_assoc(inp, init_src, &error, 2055 ntohl(initack_cp->init.initiate_tag), vrf_id, 2056 (struct thread *)NULL 2057 ); 2058 if (stcb == NULL) { 2059 struct mbuf *op_err; 2060 2061 /* memory problem? */ 2062 SCTPDBG(SCTP_DEBUG_INPUT1, 2063 "process_cookie_new: no room for another TCB!\n"); 2064 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2065 2066 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2067 sh, op_err, vrf_id, port); 2068 return (NULL); 2069 } 2070 /* get the correct sctp_nets */ 2071 if (netp) 2072 *netp = sctp_findnet(stcb, init_src); 2073 2074 asoc = &stcb->asoc; 2075 /* get scope variables out of cookie */ 2076 asoc->ipv4_local_scope = cookie->ipv4_scope; 2077 asoc->site_scope = cookie->site_scope; 2078 asoc->local_scope = cookie->local_scope; 2079 asoc->loopback_scope = cookie->loopback_scope; 2080 2081 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2082 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2083 struct mbuf *op_err; 2084 2085 /* 2086 * Houston we have a problem. The EP changed while the 2087 * cookie was in flight. Only recourse is to abort the 2088 * association. 2089 */ 2090 atomic_add_int(&stcb->asoc.refcnt, 1); 2091 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2092 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2093 sh, op_err, vrf_id, port); 2094 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2095 SCTP_TCB_UNLOCK(stcb); 2096 SCTP_SOCKET_LOCK(so, 1); 2097 SCTP_TCB_LOCK(stcb); 2098 #endif 2099 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2100 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2101 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2102 SCTP_SOCKET_UNLOCK(so, 1); 2103 #endif 2104 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2105 return (NULL); 2106 } 2107 /* process the INIT-ACK info (my info) */ 2108 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2109 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2110 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2111 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2112 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2113 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2114 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2115 asoc->str_reset_seq_in = asoc->init_seq_number; 2116 2117 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2118 2119 /* process the INIT info (peer's info) */ 2120 if (netp) 2121 retval = sctp_process_init(init_cp, stcb); 2122 else 2123 retval = 0; 2124 if (retval < 0) { 2125 atomic_add_int(&stcb->asoc.refcnt, 1); 2126 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2127 SCTP_TCB_UNLOCK(stcb); 2128 SCTP_SOCKET_LOCK(so, 1); 2129 SCTP_TCB_LOCK(stcb); 2130 #endif 2131 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2132 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2133 SCTP_SOCKET_UNLOCK(so, 1); 2134 #endif 2135 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2136 return (NULL); 2137 } 2138 /* load all addresses */ 2139 if (sctp_load_addresses_from_init(stcb, m, 2140 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2141 init_src)) { 2142 atomic_add_int(&stcb->asoc.refcnt, 1); 2143 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2144 SCTP_TCB_UNLOCK(stcb); 2145 SCTP_SOCKET_LOCK(so, 1); 2146 SCTP_TCB_LOCK(stcb); 2147 #endif 2148 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2149 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2150 SCTP_SOCKET_UNLOCK(so, 1); 2151 #endif 2152 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2153 return (NULL); 2154 } 2155 /* 2156 * verify any preceding AUTH chunk that was skipped 2157 */ 2158 /* pull the local authentication parameters from the cookie/init-ack */ 2159 sctp_auth_get_cookie_params(stcb, m, 2160 initack_offset + sizeof(struct sctp_init_ack_chunk), 2161 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2162 if (auth_skipped) { 2163 struct sctp_auth_chunk *auth; 2164 2165 auth = (struct sctp_auth_chunk *) 2166 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2167 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2168 /* auth HMAC failed, dump the assoc and packet */ 2169 SCTPDBG(SCTP_DEBUG_AUTH1, 2170 "COOKIE-ECHO: AUTH failed\n"); 2171 atomic_add_int(&stcb->asoc.refcnt, 1); 2172 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2173 SCTP_TCB_UNLOCK(stcb); 2174 SCTP_SOCKET_LOCK(so, 1); 2175 SCTP_TCB_LOCK(stcb); 2176 #endif 2177 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2178 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2179 SCTP_SOCKET_UNLOCK(so, 1); 2180 #endif 2181 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2182 return (NULL); 2183 } else { 2184 /* remaining chunks checked... good to go */ 2185 stcb->asoc.authenticated = 1; 2186 } 2187 } 2188 /* update current state */ 2189 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2190 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2191 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2192 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2193 stcb->sctp_ep, stcb, asoc->primary_destination); 2194 } 2195 sctp_stop_all_cookie_timers(stcb); 2196 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2197 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2198 2199 /* 2200 * if we're doing ASCONFs, check to see if we have any new local 2201 * addresses that need to get added to the peer (eg. addresses 2202 * changed while cookie echo in flight). This needs to be done 2203 * after we go to the OPEN state to do the correct asconf 2204 * processing. else, make sure we have the correct addresses in our 2205 * lists 2206 */ 2207 2208 /* warning, we re-use sin, sin6, sa_store here! */ 2209 /* pull in local_address (our "from" address) */ 2210 switch (cookie->laddr_type) { 2211 #ifdef INET 2212 case SCTP_IPV4_ADDRESS: 2213 /* source addr is IPv4 */ 2214 sin = (struct sockaddr_in *)initack_src; 2215 memset(sin, 0, sizeof(*sin)); 2216 sin->sin_family = AF_INET; 2217 sin->sin_len = sizeof(struct sockaddr_in); 2218 sin->sin_addr.s_addr = cookie->laddress[0]; 2219 break; 2220 #endif 2221 #ifdef INET6 2222 case SCTP_IPV6_ADDRESS: 2223 /* source addr is IPv6 */ 2224 sin6 = (struct sockaddr_in6 *)initack_src; 2225 memset(sin6, 0, sizeof(*sin6)); 2226 sin6->sin6_family = AF_INET6; 2227 sin6->sin6_len = sizeof(struct sockaddr_in6); 2228 sin6->sin6_scope_id = cookie->scope_id; 2229 memcpy(&sin6->sin6_addr, cookie->laddress, 2230 sizeof(sin6->sin6_addr)); 2231 break; 2232 #endif 2233 default: 2234 atomic_add_int(&stcb->asoc.refcnt, 1); 2235 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2236 SCTP_TCB_UNLOCK(stcb); 2237 SCTP_SOCKET_LOCK(so, 1); 2238 SCTP_TCB_LOCK(stcb); 2239 #endif 2240 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2241 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2242 SCTP_SOCKET_UNLOCK(so, 1); 2243 #endif 2244 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2245 return (NULL); 2246 } 2247 2248 /* set up to notify upper layer */ 2249 *notification = SCTP_NOTIFY_ASSOC_UP; 2250 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2251 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2252 (inp->sctp_socket->so_qlimit == 0)) { 2253 /* 2254 * This is an endpoint that called connect() how it got a 2255 * cookie that is NEW is a bit of a mystery. It must be that 2256 * the INIT was sent, but before it got there.. a complete 2257 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2258 * should have went to the other code.. not here.. oh well.. 2259 * a bit of protection is worth having.. 2260 */ 2261 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2262 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2263 atomic_add_int(&stcb->asoc.refcnt, 1); 2264 SCTP_TCB_UNLOCK(stcb); 2265 SCTP_SOCKET_LOCK(so, 1); 2266 SCTP_TCB_LOCK(stcb); 2267 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2268 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2269 SCTP_SOCKET_UNLOCK(so, 1); 2270 return (NULL); 2271 } 2272 #endif 2273 soisconnected(stcb->sctp_socket); 2274 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2275 SCTP_SOCKET_UNLOCK(so, 1); 2276 #endif 2277 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2278 (inp->sctp_socket->so_qlimit)) { 2279 /* 2280 * We don't want to do anything with this one. Since it is 2281 * the listening guy. The timer will get started for 2282 * accepted connections in the caller. 2283 */ 2284 ; 2285 } 2286 /* since we did not send a HB make sure we don't double things */ 2287 if ((netp) && (*netp)) 2288 (*netp)->hb_responded = 1; 2289 2290 if (stcb->asoc.sctp_autoclose_ticks && 2291 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2292 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2293 } 2294 /* calculate the RTT */ 2295 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2296 if ((netp) && (*netp)) { 2297 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2298 &cookie->time_entered, sctp_align_unsafe_makecopy, 2299 SCTP_RTT_FROM_NON_DATA); 2300 } 2301 /* respond with a COOKIE-ACK */ 2302 sctp_send_cookie_ack(stcb); 2303 2304 /* 2305 * check the address lists for any ASCONFs that need to be sent 2306 * AFTER the cookie-ack is sent 2307 */ 2308 sctp_check_address_list(stcb, m, 2309 initack_offset + sizeof(struct sctp_init_ack_chunk), 2310 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2311 initack_src, cookie->local_scope, cookie->site_scope, 2312 cookie->ipv4_scope, cookie->loopback_scope); 2313 2314 2315 return (stcb); 2316 } 2317 2318 /* 2319 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2320 * we NEED to make sure we are not already using the vtag. If so we 2321 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2322 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2323 SCTP_BASE_INFO(hashasocmark))]; 2324 LIST_FOREACH(stcb, head, sctp_asocs) { 2325 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2326 -- SEND ABORT - TRY AGAIN -- 2327 } 2328 } 2329 */ 2330 2331 /* 2332 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2333 * existing (non-NULL) TCB 2334 */ 2335 static struct mbuf * 2336 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2337 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2338 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2339 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2340 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2341 { 2342 struct sctp_state_cookie *cookie; 2343 struct sctp_tcb *l_stcb = *stcb; 2344 struct sctp_inpcb *l_inp; 2345 struct sockaddr *to; 2346 struct sctp_pcb *ep; 2347 struct mbuf *m_sig; 2348 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2349 uint8_t *sig; 2350 uint8_t cookie_ok = 0; 2351 unsigned int size_of_pkt, sig_offset, cookie_offset; 2352 unsigned int cookie_len; 2353 struct timeval now; 2354 struct timeval time_expires; 2355 struct sockaddr_storage dest_store; 2356 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2357 struct ip *iph; 2358 int notification = 0; 2359 struct sctp_nets *netl; 2360 int had_a_existing_tcb = 0; 2361 int send_int_conf = 0; 2362 2363 #ifdef INET 2364 struct sockaddr_in sin; 2365 2366 #endif 2367 #ifdef INET6 2368 struct sockaddr_in6 sin6; 2369 2370 #endif 2371 2372 SCTPDBG(SCTP_DEBUG_INPUT2, 2373 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2374 2375 if (inp_p == NULL) { 2376 return (NULL); 2377 } 2378 /* First get the destination address setup too. */ 2379 iph = mtod(m, struct ip *); 2380 switch (iph->ip_v) { 2381 #ifdef INET 2382 case IPVERSION: 2383 { 2384 /* its IPv4 */ 2385 struct sockaddr_in *lsin; 2386 2387 lsin = (struct sockaddr_in *)(localep_sa); 2388 memset(lsin, 0, sizeof(*lsin)); 2389 lsin->sin_family = AF_INET; 2390 lsin->sin_len = sizeof(*lsin); 2391 lsin->sin_port = sh->dest_port; 2392 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2393 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2394 break; 2395 } 2396 #endif 2397 #ifdef INET6 2398 case IPV6_VERSION >> 4: 2399 { 2400 /* its IPv6 */ 2401 struct ip6_hdr *ip6; 2402 struct sockaddr_in6 *lsin6; 2403 2404 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2405 memset(lsin6, 0, sizeof(*lsin6)); 2406 lsin6->sin6_family = AF_INET6; 2407 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2408 ip6 = mtod(m, struct ip6_hdr *); 2409 lsin6->sin6_port = sh->dest_port; 2410 lsin6->sin6_addr = ip6->ip6_dst; 2411 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2412 break; 2413 } 2414 #endif 2415 default: 2416 return (NULL); 2417 } 2418 2419 cookie = &cp->cookie; 2420 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2421 cookie_len = ntohs(cp->ch.chunk_length); 2422 2423 if ((cookie->peerport != sh->src_port) && 2424 (cookie->myport != sh->dest_port) && 2425 (cookie->my_vtag != sh->v_tag)) { 2426 /* 2427 * invalid ports or bad tag. Note that we always leave the 2428 * v_tag in the header in network order and when we stored 2429 * it in the my_vtag slot we also left it in network order. 2430 * This maintains the match even though it may be in the 2431 * opposite byte order of the machine :-> 2432 */ 2433 return (NULL); 2434 } 2435 if (cookie_len > size_of_pkt || 2436 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2437 sizeof(struct sctp_init_chunk) + 2438 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2439 /* cookie too long! or too small */ 2440 return (NULL); 2441 } 2442 /* 2443 * split off the signature into its own mbuf (since it should not be 2444 * calculated in the sctp_hmac_m() call). 2445 */ 2446 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2447 if (sig_offset > size_of_pkt) { 2448 /* packet not correct size! */ 2449 /* XXX this may already be accounted for earlier... */ 2450 return (NULL); 2451 } 2452 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2453 if (m_sig == NULL) { 2454 /* out of memory or ?? */ 2455 return (NULL); 2456 } 2457 #ifdef SCTP_MBUF_LOGGING 2458 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2459 struct mbuf *mat; 2460 2461 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2462 if (SCTP_BUF_IS_EXTENDED(mat)) { 2463 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2464 } 2465 } 2466 } 2467 #endif 2468 2469 /* 2470 * compute the signature/digest for the cookie 2471 */ 2472 ep = &(*inp_p)->sctp_ep; 2473 l_inp = *inp_p; 2474 if (l_stcb) { 2475 SCTP_TCB_UNLOCK(l_stcb); 2476 } 2477 SCTP_INP_RLOCK(l_inp); 2478 if (l_stcb) { 2479 SCTP_TCB_LOCK(l_stcb); 2480 } 2481 /* which cookie is it? */ 2482 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2483 (ep->current_secret_number != ep->last_secret_number)) { 2484 /* it's the old cookie */ 2485 (void)sctp_hmac_m(SCTP_HMAC, 2486 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2487 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2488 } else { 2489 /* it's the current cookie */ 2490 (void)sctp_hmac_m(SCTP_HMAC, 2491 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2492 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2493 } 2494 /* get the signature */ 2495 SCTP_INP_RUNLOCK(l_inp); 2496 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2497 if (sig == NULL) { 2498 /* couldn't find signature */ 2499 sctp_m_freem(m_sig); 2500 return (NULL); 2501 } 2502 /* compare the received digest with the computed digest */ 2503 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2504 /* try the old cookie? */ 2505 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2506 (ep->current_secret_number != ep->last_secret_number)) { 2507 /* compute digest with old */ 2508 (void)sctp_hmac_m(SCTP_HMAC, 2509 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2510 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2511 /* compare */ 2512 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2513 cookie_ok = 1; 2514 } 2515 } else { 2516 cookie_ok = 1; 2517 } 2518 2519 /* 2520 * Now before we continue we must reconstruct our mbuf so that 2521 * normal processing of any other chunks will work. 2522 */ 2523 { 2524 struct mbuf *m_at; 2525 2526 m_at = m; 2527 while (SCTP_BUF_NEXT(m_at) != NULL) { 2528 m_at = SCTP_BUF_NEXT(m_at); 2529 } 2530 SCTP_BUF_NEXT(m_at) = m_sig; 2531 } 2532 2533 if (cookie_ok == 0) { 2534 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2535 SCTPDBG(SCTP_DEBUG_INPUT2, 2536 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2537 (uint32_t) offset, cookie_offset, sig_offset); 2538 return (NULL); 2539 } 2540 /* 2541 * check the cookie timestamps to be sure it's not stale 2542 */ 2543 (void)SCTP_GETTIME_TIMEVAL(&now); 2544 /* Expire time is in Ticks, so we convert to seconds */ 2545 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2546 time_expires.tv_usec = cookie->time_entered.tv_usec; 2547 /* 2548 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2549 * is undefined. 2550 */ 2551 if (timevalcmp(&now, &time_expires, >)) { 2552 /* cookie is stale! */ 2553 struct mbuf *op_err; 2554 struct sctp_stale_cookie_msg *scm; 2555 uint32_t tim; 2556 2557 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2558 0, M_DONTWAIT, 1, MT_DATA); 2559 if (op_err == NULL) { 2560 /* FOOBAR */ 2561 return (NULL); 2562 } 2563 /* Set the len */ 2564 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2565 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2566 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2567 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2568 (sizeof(uint32_t)))); 2569 /* seconds to usec */ 2570 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2571 /* add in usec */ 2572 if (tim == 0) 2573 tim = now.tv_usec - cookie->time_entered.tv_usec; 2574 scm->time_usec = htonl(tim); 2575 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2576 vrf_id, port); 2577 return (NULL); 2578 } 2579 /* 2580 * Now we must see with the lookup address if we have an existing 2581 * asoc. This will only happen if we were in the COOKIE-WAIT state 2582 * and a INIT collided with us and somewhere the peer sent the 2583 * cookie on another address besides the single address our assoc 2584 * had for him. In this case we will have one of the tie-tags set at 2585 * least AND the address field in the cookie can be used to look it 2586 * up. 2587 */ 2588 to = NULL; 2589 switch (cookie->addr_type) { 2590 #ifdef INET6 2591 case SCTP_IPV6_ADDRESS: 2592 memset(&sin6, 0, sizeof(sin6)); 2593 sin6.sin6_family = AF_INET6; 2594 sin6.sin6_len = sizeof(sin6); 2595 sin6.sin6_port = sh->src_port; 2596 sin6.sin6_scope_id = cookie->scope_id; 2597 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2598 sizeof(sin6.sin6_addr.s6_addr)); 2599 to = (struct sockaddr *)&sin6; 2600 break; 2601 #endif 2602 #ifdef INET 2603 case SCTP_IPV4_ADDRESS: 2604 memset(&sin, 0, sizeof(sin)); 2605 sin.sin_family = AF_INET; 2606 sin.sin_len = sizeof(sin); 2607 sin.sin_port = sh->src_port; 2608 sin.sin_addr.s_addr = cookie->address[0]; 2609 to = (struct sockaddr *)&sin; 2610 break; 2611 #endif 2612 default: 2613 /* This should not happen */ 2614 return (NULL); 2615 } 2616 if ((*stcb == NULL) && to) { 2617 /* Yep, lets check */ 2618 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2619 if (*stcb == NULL) { 2620 /* 2621 * We should have only got back the same inp. If we 2622 * got back a different ep we have a problem. The 2623 * original findep got back l_inp and now 2624 */ 2625 if (l_inp != *inp_p) { 2626 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2627 } 2628 } else { 2629 if (*locked_tcb == NULL) { 2630 /* 2631 * In this case we found the assoc only 2632 * after we locked the create lock. This 2633 * means we are in a colliding case and we 2634 * must make sure that we unlock the tcb if 2635 * its one of the cases where we throw away 2636 * the incoming packets. 2637 */ 2638 *locked_tcb = *stcb; 2639 2640 /* 2641 * We must also increment the inp ref count 2642 * since the ref_count flags was set when we 2643 * did not find the TCB, now we found it 2644 * which reduces the refcount.. we must 2645 * raise it back out to balance it all :-) 2646 */ 2647 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2648 if ((*stcb)->sctp_ep != l_inp) { 2649 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2650 (*stcb)->sctp_ep, l_inp); 2651 } 2652 } 2653 } 2654 } 2655 if (to == NULL) { 2656 return (NULL); 2657 } 2658 cookie_len -= SCTP_SIGNATURE_SIZE; 2659 if (*stcb == NULL) { 2660 /* this is the "normal" case... get a new TCB */ 2661 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2662 cookie_len, *inp_p, netp, to, ¬ification, 2663 auth_skipped, auth_offset, auth_len, vrf_id, port); 2664 } else { 2665 /* this is abnormal... cookie-echo on existing TCB */ 2666 had_a_existing_tcb = 1; 2667 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2668 cookie, cookie_len, *inp_p, *stcb, netp, to, 2669 ¬ification, vrf_id, auth_skipped, auth_offset, auth_len, port); 2670 } 2671 2672 if (*stcb == NULL) { 2673 /* still no TCB... must be bad cookie-echo */ 2674 return (NULL); 2675 } 2676 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2677 (*netp)->flowid = m->m_pkthdr.flowid; 2678 #ifdef INVARIANTS 2679 (*netp)->flowidset = 1; 2680 #endif 2681 } 2682 /* 2683 * Ok, we built an association so confirm the address we sent the 2684 * INIT-ACK to. 2685 */ 2686 netl = sctp_findnet(*stcb, to); 2687 /* 2688 * This code should in theory NOT run but 2689 */ 2690 if (netl == NULL) { 2691 /* TSNH! Huh, why do I need to add this address here? */ 2692 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2693 return (NULL); 2694 } 2695 netl = sctp_findnet(*stcb, to); 2696 } 2697 if (netl) { 2698 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2699 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2700 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2701 netl); 2702 send_int_conf = 1; 2703 } 2704 } 2705 sctp_start_net_timers(*stcb); 2706 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2707 if (!had_a_existing_tcb || 2708 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2709 /* 2710 * If we have a NEW cookie or the connect never 2711 * reached the connected state during collision we 2712 * must do the TCP accept thing. 2713 */ 2714 struct socket *so, *oso; 2715 struct sctp_inpcb *inp; 2716 2717 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2718 /* 2719 * For a restart we will keep the same 2720 * socket, no need to do anything. I THINK!! 2721 */ 2722 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2723 if (send_int_conf) { 2724 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2725 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2726 } 2727 return (m); 2728 } 2729 oso = (*inp_p)->sctp_socket; 2730 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2731 SCTP_TCB_UNLOCK((*stcb)); 2732 CURVNET_SET(oso->so_vnet); 2733 so = sonewconn(oso, 0 2734 ); 2735 CURVNET_RESTORE(); 2736 SCTP_TCB_LOCK((*stcb)); 2737 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2738 2739 if (so == NULL) { 2740 struct mbuf *op_err; 2741 2742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2743 struct socket *pcb_so; 2744 2745 #endif 2746 /* Too many sockets */ 2747 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2748 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2749 sctp_abort_association(*inp_p, NULL, m, iphlen, 2750 sh, op_err, vrf_id, port); 2751 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2752 pcb_so = SCTP_INP_SO(*inp_p); 2753 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2754 SCTP_TCB_UNLOCK((*stcb)); 2755 SCTP_SOCKET_LOCK(pcb_so, 1); 2756 SCTP_TCB_LOCK((*stcb)); 2757 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2758 #endif 2759 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2760 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2761 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2762 #endif 2763 return (NULL); 2764 } 2765 inp = (struct sctp_inpcb *)so->so_pcb; 2766 SCTP_INP_INCR_REF(inp); 2767 /* 2768 * We add the unbound flag here so that if we get an 2769 * soabort() before we get the move_pcb done, we 2770 * will properly cleanup. 2771 */ 2772 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2773 SCTP_PCB_FLAGS_CONNECTED | 2774 SCTP_PCB_FLAGS_IN_TCPPOOL | 2775 SCTP_PCB_FLAGS_UNBOUND | 2776 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2777 SCTP_PCB_FLAGS_DONT_WAKE); 2778 inp->sctp_features = (*inp_p)->sctp_features; 2779 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2780 inp->sctp_socket = so; 2781 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2782 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2783 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2784 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2785 inp->sctp_context = (*inp_p)->sctp_context; 2786 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2787 inp->inp_starting_point_for_iterator = NULL; 2788 /* 2789 * copy in the authentication parameters from the 2790 * original endpoint 2791 */ 2792 if (inp->sctp_ep.local_hmacs) 2793 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2794 inp->sctp_ep.local_hmacs = 2795 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2796 if (inp->sctp_ep.local_auth_chunks) 2797 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2798 inp->sctp_ep.local_auth_chunks = 2799 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2800 2801 /* 2802 * Now we must move it from one hash table to 2803 * another and get the tcb in the right place. 2804 */ 2805 2806 /* 2807 * This is where the one-2-one socket is put into 2808 * the accept state waiting for the accept! 2809 */ 2810 if (*stcb) { 2811 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2812 } 2813 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2814 2815 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2816 SCTP_TCB_UNLOCK((*stcb)); 2817 2818 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2819 0); 2820 SCTP_TCB_LOCK((*stcb)); 2821 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2822 2823 2824 /* 2825 * now we must check to see if we were aborted while 2826 * the move was going on and the lock/unlock 2827 * happened. 2828 */ 2829 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2830 /* 2831 * yep it was, we leave the assoc attached 2832 * to the socket since the sctp_inpcb_free() 2833 * call will send an abort for us. 2834 */ 2835 SCTP_INP_DECR_REF(inp); 2836 return (NULL); 2837 } 2838 SCTP_INP_DECR_REF(inp); 2839 /* Switch over to the new guy */ 2840 *inp_p = inp; 2841 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2842 if (send_int_conf) { 2843 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2844 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2845 } 2846 /* 2847 * Pull it from the incomplete queue and wake the 2848 * guy 2849 */ 2850 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2851 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2852 SCTP_TCB_UNLOCK((*stcb)); 2853 SCTP_SOCKET_LOCK(so, 1); 2854 #endif 2855 soisconnected(so); 2856 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2857 SCTP_TCB_LOCK((*stcb)); 2858 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2859 SCTP_SOCKET_UNLOCK(so, 1); 2860 #endif 2861 return (m); 2862 } 2863 } 2864 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2865 if (notification) { 2866 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2867 } 2868 if (send_int_conf) { 2869 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2870 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2871 } 2872 } 2873 return (m); 2874 } 2875 2876 static void 2877 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2878 struct sctp_tcb *stcb, struct sctp_nets *net) 2879 { 2880 /* cp must not be used, others call this without a c-ack :-) */ 2881 struct sctp_association *asoc; 2882 2883 SCTPDBG(SCTP_DEBUG_INPUT2, 2884 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2885 if (stcb == NULL) 2886 return; 2887 2888 asoc = &stcb->asoc; 2889 2890 sctp_stop_all_cookie_timers(stcb); 2891 /* process according to association state */ 2892 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2893 /* state change only needed when I am in right state */ 2894 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2895 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2896 sctp_start_net_timers(stcb); 2897 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2898 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2899 stcb->sctp_ep, stcb, asoc->primary_destination); 2900 2901 } 2902 /* update RTO */ 2903 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2904 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2905 if (asoc->overall_error_count == 0) { 2906 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2907 &asoc->time_entered, sctp_align_safe_nocopy, 2908 SCTP_RTT_FROM_NON_DATA); 2909 } 2910 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2911 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2912 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2913 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2914 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2915 struct socket *so; 2916 2917 #endif 2918 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2919 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2920 so = SCTP_INP_SO(stcb->sctp_ep); 2921 atomic_add_int(&stcb->asoc.refcnt, 1); 2922 SCTP_TCB_UNLOCK(stcb); 2923 SCTP_SOCKET_LOCK(so, 1); 2924 SCTP_TCB_LOCK(stcb); 2925 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2926 #endif 2927 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2928 soisconnected(stcb->sctp_socket); 2929 } 2930 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2931 SCTP_SOCKET_UNLOCK(so, 1); 2932 #endif 2933 } 2934 /* 2935 * since we did not send a HB make sure we don't double 2936 * things 2937 */ 2938 net->hb_responded = 1; 2939 2940 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2941 /* 2942 * We don't need to do the asconf thing, nor hb or 2943 * autoclose if the socket is closed. 2944 */ 2945 goto closed_socket; 2946 } 2947 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2948 stcb, net); 2949 2950 2951 if (stcb->asoc.sctp_autoclose_ticks && 2952 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2953 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2954 stcb->sctp_ep, stcb, NULL); 2955 } 2956 /* 2957 * send ASCONF if parameters are pending and ASCONFs are 2958 * allowed (eg. addresses changed when init/cookie echo were 2959 * in flight) 2960 */ 2961 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2962 (stcb->asoc.peer_supports_asconf) && 2963 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2964 #ifdef SCTP_TIMER_BASED_ASCONF 2965 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2966 stcb->sctp_ep, stcb, 2967 stcb->asoc.primary_destination); 2968 #else 2969 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2970 SCTP_ADDR_NOT_LOCKED); 2971 #endif 2972 } 2973 } 2974 closed_socket: 2975 /* Toss the cookie if I can */ 2976 sctp_toss_old_cookies(stcb, asoc); 2977 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2978 /* Restart the timer if we have pending data */ 2979 struct sctp_tmit_chunk *chk; 2980 2981 chk = TAILQ_FIRST(&asoc->sent_queue); 2982 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2983 } 2984 } 2985 2986 static void 2987 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2988 struct sctp_tcb *stcb) 2989 { 2990 struct sctp_nets *net; 2991 struct sctp_tmit_chunk *lchk; 2992 struct sctp_ecne_chunk bkup; 2993 uint8_t override_bit; 2994 uint32_t tsn, window_data_tsn; 2995 int len; 2996 unsigned int pkt_cnt; 2997 2998 len = ntohs(cp->ch.chunk_length); 2999 if ((len != sizeof(struct sctp_ecne_chunk)) && 3000 (len != sizeof(struct old_sctp_ecne_chunk))) { 3001 return; 3002 } 3003 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3004 /* Its the old format */ 3005 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3006 bkup.num_pkts_since_cwr = htonl(1); 3007 cp = &bkup; 3008 } 3009 SCTP_STAT_INCR(sctps_recvecne); 3010 tsn = ntohl(cp->tsn); 3011 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3012 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3013 if (lchk == NULL) { 3014 window_data_tsn = stcb->asoc.sending_seq - 1; 3015 } else { 3016 window_data_tsn = lchk->rec.data.TSN_seq; 3017 } 3018 3019 /* Find where it was sent to if possible. */ 3020 net = NULL; 3021 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3022 if (lchk->rec.data.TSN_seq == tsn) { 3023 net = lchk->whoTo; 3024 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3025 break; 3026 } 3027 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3028 break; 3029 } 3030 } 3031 if (net == NULL) { 3032 /* 3033 * What to do. A previous send of a CWR was possibly lost. 3034 * See how old it is, we may have it marked on the actual 3035 * net. 3036 */ 3037 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3038 if (tsn == net->last_cwr_tsn) { 3039 /* Found him, send it off */ 3040 break; 3041 } 3042 } 3043 if (net == NULL) { 3044 /* 3045 * If we reach here, we need to send a special CWR 3046 * that says hey, we did this a long time ago and 3047 * you lost the response. 3048 */ 3049 net = TAILQ_FIRST(&stcb->asoc.nets); 3050 if (net == NULL) { 3051 /* TSNH */ 3052 return; 3053 } 3054 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3055 } else { 3056 override_bit = 0; 3057 } 3058 } else { 3059 override_bit = 0; 3060 } 3061 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3062 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3063 /* 3064 * JRS - Use the congestion control given in the pluggable 3065 * CC module 3066 */ 3067 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3068 /* 3069 * We reduce once every RTT. So we will only lower cwnd at 3070 * the next sending seq i.e. the window_data_tsn 3071 */ 3072 net->cwr_window_tsn = window_data_tsn; 3073 net->ecn_ce_pkt_cnt += pkt_cnt; 3074 net->lost_cnt = pkt_cnt; 3075 net->last_cwr_tsn = tsn; 3076 } else { 3077 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3078 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3079 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3080 /* 3081 * Another loss in the same window update how many 3082 * marks/packets lost we have had. 3083 */ 3084 int cnt = 1; 3085 3086 if (pkt_cnt > net->lost_cnt) { 3087 /* Should be the case */ 3088 cnt = (pkt_cnt - net->lost_cnt); 3089 net->ecn_ce_pkt_cnt += cnt; 3090 } 3091 net->lost_cnt = pkt_cnt; 3092 net->last_cwr_tsn = tsn; 3093 /* 3094 * Most CC functions will ignore this call, since we 3095 * are in-window yet of the initial CE the peer saw. 3096 */ 3097 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3098 } 3099 } 3100 /* 3101 * We always send a CWR this way if our previous one was lost our 3102 * peer will get an update, or if it is not time again to reduce we 3103 * still get the cwr to the peer. Note we set the override when we 3104 * could not find the TSN on the chunk or the destination network. 3105 */ 3106 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3107 } 3108 3109 static void 3110 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3111 { 3112 /* 3113 * Here we get a CWR from the peer. We must look in the outqueue and 3114 * make sure that we have a covered ECNE in teh control chunk part. 3115 * If so remove it. 3116 */ 3117 struct sctp_tmit_chunk *chk; 3118 struct sctp_ecne_chunk *ecne; 3119 int override; 3120 uint32_t cwr_tsn; 3121 3122 cwr_tsn = ntohl(cp->tsn); 3123 3124 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3125 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3126 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3127 continue; 3128 } 3129 if ((override == 0) && (chk->whoTo != net)) { 3130 /* Must be from the right src unless override is set */ 3131 continue; 3132 } 3133 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3134 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3135 /* this covers this ECNE, we can remove it */ 3136 stcb->asoc.ecn_echo_cnt_onq--; 3137 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3138 sctp_next); 3139 if (chk->data) { 3140 sctp_m_freem(chk->data); 3141 chk->data = NULL; 3142 } 3143 stcb->asoc.ctrl_queue_cnt--; 3144 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3145 if (override == 0) { 3146 break; 3147 } 3148 } 3149 } 3150 } 3151 3152 static void 3153 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3154 struct sctp_tcb *stcb, struct sctp_nets *net) 3155 { 3156 struct sctp_association *asoc; 3157 3158 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3159 struct socket *so; 3160 3161 #endif 3162 3163 SCTPDBG(SCTP_DEBUG_INPUT2, 3164 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3165 if (stcb == NULL) 3166 return; 3167 3168 asoc = &stcb->asoc; 3169 /* process according to association state */ 3170 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3171 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3172 SCTPDBG(SCTP_DEBUG_INPUT2, 3173 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3174 SCTP_TCB_UNLOCK(stcb); 3175 return; 3176 } 3177 /* notify upper layer protocol */ 3178 if (stcb->sctp_socket) { 3179 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3180 /* are the queues empty? they should be */ 3181 if (!TAILQ_EMPTY(&asoc->send_queue) || 3182 !TAILQ_EMPTY(&asoc->sent_queue) || 3183 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3184 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3185 } 3186 } 3187 /* stop the timer */ 3188 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3189 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3190 /* free the TCB */ 3191 SCTPDBG(SCTP_DEBUG_INPUT2, 3192 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3193 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3194 so = SCTP_INP_SO(stcb->sctp_ep); 3195 atomic_add_int(&stcb->asoc.refcnt, 1); 3196 SCTP_TCB_UNLOCK(stcb); 3197 SCTP_SOCKET_LOCK(so, 1); 3198 SCTP_TCB_LOCK(stcb); 3199 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3200 #endif 3201 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3202 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3203 SCTP_SOCKET_UNLOCK(so, 1); 3204 #endif 3205 return; 3206 } 3207 3208 static int 3209 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3210 struct sctp_nets *net, uint8_t flg) 3211 { 3212 switch (desc->chunk_type) { 3213 case SCTP_DATA: 3214 /* find the tsn to resend (possibly */ 3215 { 3216 uint32_t tsn; 3217 struct sctp_tmit_chunk *tp1; 3218 3219 tsn = ntohl(desc->tsn_ifany); 3220 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3221 if (tp1->rec.data.TSN_seq == tsn) { 3222 /* found it */ 3223 break; 3224 } 3225 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3226 /* not found */ 3227 tp1 = NULL; 3228 break; 3229 } 3230 } 3231 if (tp1 == NULL) { 3232 /* 3233 * Do it the other way , aka without paying 3234 * attention to queue seq order. 3235 */ 3236 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3237 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3238 if (tp1->rec.data.TSN_seq == tsn) { 3239 /* found it */ 3240 break; 3241 } 3242 } 3243 } 3244 if (tp1 == NULL) { 3245 SCTP_STAT_INCR(sctps_pdrptsnnf); 3246 } 3247 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3248 uint8_t *ddp; 3249 3250 if (((flg & SCTP_BADCRC) == 0) && 3251 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3252 return (0); 3253 } 3254 if ((stcb->asoc.peers_rwnd == 0) && 3255 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3256 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3257 return (0); 3258 } 3259 if (stcb->asoc.peers_rwnd == 0 && 3260 (flg & SCTP_FROM_MIDDLE_BOX)) { 3261 SCTP_STAT_INCR(sctps_pdrpdizrw); 3262 return (0); 3263 } 3264 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3265 sizeof(struct sctp_data_chunk)); 3266 { 3267 unsigned int iii; 3268 3269 for (iii = 0; iii < sizeof(desc->data_bytes); 3270 iii++) { 3271 if (ddp[iii] != desc->data_bytes[iii]) { 3272 SCTP_STAT_INCR(sctps_pdrpbadd); 3273 return (-1); 3274 } 3275 } 3276 } 3277 3278 if (tp1->do_rtt) { 3279 /* 3280 * this guy had a RTO calculation 3281 * pending on it, cancel it 3282 */ 3283 if (tp1->whoTo->rto_needed == 0) { 3284 tp1->whoTo->rto_needed = 1; 3285 } 3286 tp1->do_rtt = 0; 3287 } 3288 SCTP_STAT_INCR(sctps_pdrpmark); 3289 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3290 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3291 /* 3292 * mark it as if we were doing a FR, since 3293 * we will be getting gap ack reports behind 3294 * the info from the router. 3295 */ 3296 tp1->rec.data.doing_fast_retransmit = 1; 3297 /* 3298 * mark the tsn with what sequences can 3299 * cause a new FR. 3300 */ 3301 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3302 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3303 } else { 3304 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3305 } 3306 3307 /* restart the timer */ 3308 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3309 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3310 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3311 stcb, tp1->whoTo); 3312 3313 /* fix counts and things */ 3314 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3315 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3316 tp1->whoTo->flight_size, 3317 tp1->book_size, 3318 (uintptr_t) stcb, 3319 tp1->rec.data.TSN_seq); 3320 } 3321 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3322 sctp_flight_size_decrease(tp1); 3323 sctp_total_flight_decrease(stcb, tp1); 3324 } 3325 tp1->sent = SCTP_DATAGRAM_RESEND; 3326 } { 3327 /* audit code */ 3328 unsigned int audit; 3329 3330 audit = 0; 3331 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3332 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3333 audit++; 3334 } 3335 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3336 sctp_next) { 3337 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3338 audit++; 3339 } 3340 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3341 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3342 audit, stcb->asoc.sent_queue_retran_cnt); 3343 #ifndef SCTP_AUDITING_ENABLED 3344 stcb->asoc.sent_queue_retran_cnt = audit; 3345 #endif 3346 } 3347 } 3348 } 3349 break; 3350 case SCTP_ASCONF: 3351 { 3352 struct sctp_tmit_chunk *asconf; 3353 3354 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3355 sctp_next) { 3356 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3357 break; 3358 } 3359 } 3360 if (asconf) { 3361 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3362 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3363 asconf->sent = SCTP_DATAGRAM_RESEND; 3364 asconf->snd_count--; 3365 } 3366 } 3367 break; 3368 case SCTP_INITIATION: 3369 /* resend the INIT */ 3370 stcb->asoc.dropped_special_cnt++; 3371 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3372 /* 3373 * If we can get it in, in a few attempts we do 3374 * this, otherwise we let the timer fire. 3375 */ 3376 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3377 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3378 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3379 } 3380 break; 3381 case SCTP_SELECTIVE_ACK: 3382 case SCTP_NR_SELECTIVE_ACK: 3383 /* resend the sack */ 3384 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3385 break; 3386 case SCTP_HEARTBEAT_REQUEST: 3387 /* resend a demand HB */ 3388 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3389 /* 3390 * Only retransmit if we KNOW we wont destroy the 3391 * tcb 3392 */ 3393 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3394 } 3395 break; 3396 case SCTP_SHUTDOWN: 3397 sctp_send_shutdown(stcb, net); 3398 break; 3399 case SCTP_SHUTDOWN_ACK: 3400 sctp_send_shutdown_ack(stcb, net); 3401 break; 3402 case SCTP_COOKIE_ECHO: 3403 { 3404 struct sctp_tmit_chunk *cookie; 3405 3406 cookie = NULL; 3407 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3408 sctp_next) { 3409 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3410 break; 3411 } 3412 } 3413 if (cookie) { 3414 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3415 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3416 cookie->sent = SCTP_DATAGRAM_RESEND; 3417 sctp_stop_all_cookie_timers(stcb); 3418 } 3419 } 3420 break; 3421 case SCTP_COOKIE_ACK: 3422 sctp_send_cookie_ack(stcb); 3423 break; 3424 case SCTP_ASCONF_ACK: 3425 /* resend last asconf ack */ 3426 sctp_send_asconf_ack(stcb); 3427 break; 3428 case SCTP_FORWARD_CUM_TSN: 3429 send_forward_tsn(stcb, &stcb->asoc); 3430 break; 3431 /* can't do anything with these */ 3432 case SCTP_PACKET_DROPPED: 3433 case SCTP_INITIATION_ACK: /* this should not happen */ 3434 case SCTP_HEARTBEAT_ACK: 3435 case SCTP_ABORT_ASSOCIATION: 3436 case SCTP_OPERATION_ERROR: 3437 case SCTP_SHUTDOWN_COMPLETE: 3438 case SCTP_ECN_ECHO: 3439 case SCTP_ECN_CWR: 3440 default: 3441 break; 3442 } 3443 return (0); 3444 } 3445 3446 void 3447 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3448 { 3449 int i; 3450 uint16_t temp; 3451 3452 /* 3453 * We set things to 0xffff since this is the last delivered sequence 3454 * and we will be sending in 0 after the reset. 3455 */ 3456 3457 if (number_entries) { 3458 for (i = 0; i < number_entries; i++) { 3459 temp = ntohs(list[i]); 3460 if (temp >= stcb->asoc.streamincnt) { 3461 continue; 3462 } 3463 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3464 } 3465 } else { 3466 list = NULL; 3467 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3468 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3469 } 3470 } 3471 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3472 } 3473 3474 static void 3475 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3476 { 3477 int i; 3478 3479 if (number_entries == 0) { 3480 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3481 stcb->asoc.strmout[i].next_sequence_sent = 0; 3482 } 3483 } else if (number_entries) { 3484 for (i = 0; i < number_entries; i++) { 3485 uint16_t temp; 3486 3487 temp = ntohs(list[i]); 3488 if (temp >= stcb->asoc.streamoutcnt) { 3489 /* no such stream */ 3490 continue; 3491 } 3492 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3493 } 3494 } 3495 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3496 } 3497 3498 3499 struct sctp_stream_reset_out_request * 3500 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3501 { 3502 struct sctp_association *asoc; 3503 struct sctp_stream_reset_out_req *req; 3504 struct sctp_stream_reset_out_request *r; 3505 struct sctp_tmit_chunk *chk; 3506 int len, clen; 3507 3508 asoc = &stcb->asoc; 3509 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3510 asoc->stream_reset_outstanding = 0; 3511 return (NULL); 3512 } 3513 if (stcb->asoc.str_reset == NULL) { 3514 asoc->stream_reset_outstanding = 0; 3515 return (NULL); 3516 } 3517 chk = stcb->asoc.str_reset; 3518 if (chk->data == NULL) { 3519 return (NULL); 3520 } 3521 if (bchk) { 3522 /* he wants a copy of the chk pointer */ 3523 *bchk = chk; 3524 } 3525 clen = chk->send_size; 3526 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3527 r = &req->sr_req; 3528 if (ntohl(r->request_seq) == seq) { 3529 /* found it */ 3530 return (r); 3531 } 3532 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3533 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3534 /* move to the next one, there can only be a max of two */ 3535 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3536 if (ntohl(r->request_seq) == seq) { 3537 return (r); 3538 } 3539 } 3540 /* that seq is not here */ 3541 return (NULL); 3542 } 3543 3544 static void 3545 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3546 { 3547 struct sctp_association *asoc; 3548 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3549 3550 if (stcb->asoc.str_reset == NULL) { 3551 return; 3552 } 3553 asoc = &stcb->asoc; 3554 3555 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3556 TAILQ_REMOVE(&asoc->control_send_queue, 3557 chk, 3558 sctp_next); 3559 if (chk->data) { 3560 sctp_m_freem(chk->data); 3561 chk->data = NULL; 3562 } 3563 asoc->ctrl_queue_cnt--; 3564 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3565 /* sa_ignore NO_NULL_CHK */ 3566 stcb->asoc.str_reset = NULL; 3567 } 3568 3569 3570 static int 3571 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3572 uint32_t seq, uint32_t action, 3573 struct sctp_stream_reset_response *respin) 3574 { 3575 uint16_t type; 3576 int lparm_len; 3577 struct sctp_association *asoc = &stcb->asoc; 3578 struct sctp_tmit_chunk *chk; 3579 struct sctp_stream_reset_out_request *srparam; 3580 int number_entries; 3581 3582 if (asoc->stream_reset_outstanding == 0) { 3583 /* duplicate */ 3584 return (0); 3585 } 3586 if (seq == stcb->asoc.str_reset_seq_out) { 3587 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3588 if (srparam) { 3589 stcb->asoc.str_reset_seq_out++; 3590 type = ntohs(srparam->ph.param_type); 3591 lparm_len = ntohs(srparam->ph.param_length); 3592 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3593 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3594 asoc->stream_reset_out_is_outstanding = 0; 3595 if (asoc->stream_reset_outstanding) 3596 asoc->stream_reset_outstanding--; 3597 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3598 /* do it */ 3599 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3600 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3601 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3602 } else { 3603 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3604 } 3605 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3606 /* Answered my request */ 3607 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3608 if (asoc->stream_reset_outstanding) 3609 asoc->stream_reset_outstanding--; 3610 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3611 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3612 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3613 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3615 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3616 } 3617 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3618 /* Ok we now may have more streams */ 3619 int num_stream; 3620 3621 num_stream = stcb->asoc.strm_pending_add_size; 3622 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3623 /* TSNH */ 3624 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3625 } 3626 stcb->asoc.strm_pending_add_size = 0; 3627 if (asoc->stream_reset_outstanding) 3628 asoc->stream_reset_outstanding--; 3629 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3630 /* Put the new streams into effect */ 3631 stcb->asoc.streamoutcnt += num_stream; 3632 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3633 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3634 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3635 SCTP_STREAM_CHANGE_DENIED); 3636 } else { 3637 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3638 SCTP_STREAM_CHANGE_FAILED); 3639 } 3640 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3641 if (asoc->stream_reset_outstanding) 3642 asoc->stream_reset_outstanding--; 3643 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3644 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3645 SCTP_STREAM_CHANGE_DENIED); 3646 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3647 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3648 SCTP_STREAM_CHANGE_FAILED); 3649 } 3650 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3651 /** 3652 * a) Adopt the new in tsn. 3653 * b) reset the map 3654 * c) Adopt the new out-tsn 3655 */ 3656 struct sctp_stream_reset_response_tsn *resp; 3657 struct sctp_forward_tsn_chunk fwdtsn; 3658 int abort_flag = 0; 3659 3660 if (respin == NULL) { 3661 /* huh ? */ 3662 return (0); 3663 } 3664 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3665 resp = (struct sctp_stream_reset_response_tsn *)respin; 3666 asoc->stream_reset_outstanding--; 3667 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3668 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3669 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3670 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3671 if (abort_flag) { 3672 return (1); 3673 } 3674 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3675 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3676 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3677 } 3678 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3679 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3680 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3681 3682 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3683 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3684 3685 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3686 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3687 3688 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3689 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3690 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3691 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3692 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3693 SCTP_ASSOC_RESET_DENIED); 3694 } else { 3695 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3696 SCTP_ASSOC_RESET_FAILED); 3697 } 3698 } 3699 /* get rid of the request and get the request flags */ 3700 if (asoc->stream_reset_outstanding == 0) { 3701 sctp_clean_up_stream_reset(stcb); 3702 } 3703 } 3704 } 3705 return (0); 3706 } 3707 3708 static void 3709 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3710 struct sctp_tmit_chunk *chk, 3711 struct sctp_stream_reset_in_request *req, int trunc) 3712 { 3713 uint32_t seq; 3714 int len, i; 3715 int number_entries; 3716 uint16_t temp; 3717 3718 /* 3719 * peer wants me to send a str-reset to him for my outgoing seq's if 3720 * seq_in is right. 3721 */ 3722 struct sctp_association *asoc = &stcb->asoc; 3723 3724 seq = ntohl(req->request_seq); 3725 if (asoc->str_reset_seq_in == seq) { 3726 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3727 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3728 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3729 } else if (trunc) { 3730 /* Can't do it, since they exceeded our buffer size */ 3731 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3732 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3733 len = ntohs(req->ph.param_length); 3734 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3735 for (i = 0; i < number_entries; i++) { 3736 temp = ntohs(req->list_of_streams[i]); 3737 req->list_of_streams[i] = temp; 3738 } 3739 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3740 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3741 asoc->str_reset_seq_out, 3742 seq, (asoc->sending_seq - 1)); 3743 asoc->stream_reset_out_is_outstanding = 1; 3744 asoc->str_reset = chk; 3745 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3746 stcb->asoc.stream_reset_outstanding++; 3747 } else { 3748 /* Can't do it, since we have sent one out */ 3749 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3750 } 3751 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3752 asoc->str_reset_seq_in++; 3753 } else if (asoc->str_reset_seq_in - 1 == seq) { 3754 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3755 } else if (asoc->str_reset_seq_in - 2 == seq) { 3756 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3757 } else { 3758 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3759 } 3760 } 3761 3762 static int 3763 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3764 struct sctp_tmit_chunk *chk, 3765 struct sctp_stream_reset_tsn_request *req) 3766 { 3767 /* reset all in and out and update the tsn */ 3768 /* 3769 * A) reset my str-seq's on in and out. B) Select a receive next, 3770 * and set cum-ack to it. Also process this selected number as a 3771 * fwd-tsn as well. C) set in the response my next sending seq. 3772 */ 3773 struct sctp_forward_tsn_chunk fwdtsn; 3774 struct sctp_association *asoc = &stcb->asoc; 3775 int abort_flag = 0; 3776 uint32_t seq; 3777 3778 seq = ntohl(req->request_seq); 3779 if (asoc->str_reset_seq_in == seq) { 3780 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3781 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3782 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3783 } else { 3784 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3785 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3786 fwdtsn.ch.chunk_flags = 0; 3787 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3788 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3789 if (abort_flag) { 3790 return (1); 3791 } 3792 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3793 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3794 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3795 } 3796 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3797 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3798 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3799 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3800 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3801 atomic_add_int(&asoc->sending_seq, 1); 3802 /* save off historical data for retrans */ 3803 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3804 asoc->last_sending_seq[0] = asoc->sending_seq; 3805 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3806 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3807 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3808 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3809 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3810 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3811 } 3812 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3813 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3814 asoc->str_reset_seq_in++; 3815 } else if (asoc->str_reset_seq_in - 1 == seq) { 3816 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3817 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3818 } else if (asoc->str_reset_seq_in - 2 == seq) { 3819 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3820 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3821 } else { 3822 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3823 } 3824 return (0); 3825 } 3826 3827 static void 3828 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3829 struct sctp_tmit_chunk *chk, 3830 struct sctp_stream_reset_out_request *req, int trunc) 3831 { 3832 uint32_t seq, tsn; 3833 int number_entries, len; 3834 struct sctp_association *asoc = &stcb->asoc; 3835 3836 seq = ntohl(req->request_seq); 3837 3838 /* now if its not a duplicate we process it */ 3839 if (asoc->str_reset_seq_in == seq) { 3840 len = ntohs(req->ph.param_length); 3841 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3842 /* 3843 * the sender is resetting, handle the list issue.. we must 3844 * a) verify if we can do the reset, if so no problem b) If 3845 * we can't do the reset we must copy the request. c) queue 3846 * it, and setup the data in processor to trigger it off 3847 * when needed and dequeue all the queued data. 3848 */ 3849 tsn = ntohl(req->send_reset_at_tsn); 3850 3851 /* move the reset action back one */ 3852 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3853 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3854 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3855 } else if (trunc) { 3856 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3857 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3858 /* we can do it now */ 3859 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3860 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3861 } else { 3862 /* 3863 * we must queue it up and thus wait for the TSN's 3864 * to arrive that are at or before tsn 3865 */ 3866 struct sctp_stream_reset_list *liste; 3867 int siz; 3868 3869 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3870 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3871 siz, SCTP_M_STRESET); 3872 if (liste == NULL) { 3873 /* gak out of memory */ 3874 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3875 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3876 return; 3877 } 3878 liste->tsn = tsn; 3879 liste->number_entries = number_entries; 3880 memcpy(&liste->req, req, 3881 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3882 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3883 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3884 } 3885 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3886 asoc->str_reset_seq_in++; 3887 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3888 /* 3889 * one seq back, just echo back last action since my 3890 * response was lost. 3891 */ 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3894 /* 3895 * two seq back, just echo back last action since my 3896 * response was lost. 3897 */ 3898 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3899 } else { 3900 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3901 } 3902 } 3903 3904 static void 3905 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3906 struct sctp_stream_reset_add_strm *str_add) 3907 { 3908 /* 3909 * Peer is requesting to add more streams. If its within our 3910 * max-streams we will allow it. 3911 */ 3912 uint32_t num_stream, i; 3913 uint32_t seq; 3914 struct sctp_association *asoc = &stcb->asoc; 3915 struct sctp_queued_to_read *ctl, *nctl; 3916 3917 /* Get the number. */ 3918 seq = ntohl(str_add->request_seq); 3919 num_stream = ntohs(str_add->number_of_streams); 3920 /* Now what would be the new total? */ 3921 if (asoc->str_reset_seq_in == seq) { 3922 num_stream += stcb->asoc.streamincnt; 3923 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3924 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3925 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3926 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3927 (num_stream > 0xffff)) { 3928 /* We must reject it they ask for to many */ 3929 denied: 3930 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3931 } else { 3932 /* Ok, we can do that :-) */ 3933 struct sctp_stream_in *oldstrm; 3934 3935 /* save off the old */ 3936 oldstrm = stcb->asoc.strmin; 3937 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3938 (num_stream * sizeof(struct sctp_stream_in)), 3939 SCTP_M_STRMI); 3940 if (stcb->asoc.strmin == NULL) { 3941 stcb->asoc.strmin = oldstrm; 3942 goto denied; 3943 } 3944 /* copy off the old data */ 3945 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3946 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3947 stcb->asoc.strmin[i].stream_no = i; 3948 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3949 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3950 /* now anything on those queues? */ 3951 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3952 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3953 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3954 } 3955 } 3956 /* Init the new streams */ 3957 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3958 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3959 stcb->asoc.strmin[i].stream_no = i; 3960 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3961 stcb->asoc.strmin[i].delivery_started = 0; 3962 } 3963 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3964 /* update the size */ 3965 stcb->asoc.streamincnt = num_stream; 3966 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3967 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3968 } 3969 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3970 asoc->str_reset_seq_in++; 3971 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3972 /* 3973 * one seq back, just echo back last action since my 3974 * response was lost. 3975 */ 3976 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3977 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3978 /* 3979 * two seq back, just echo back last action since my 3980 * response was lost. 3981 */ 3982 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3983 } else { 3984 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3985 3986 } 3987 } 3988 3989 static void 3990 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3991 struct sctp_stream_reset_add_strm *str_add) 3992 { 3993 /* 3994 * Peer is requesting to add more streams. If its within our 3995 * max-streams we will allow it. 3996 */ 3997 uint16_t num_stream; 3998 uint32_t seq; 3999 struct sctp_association *asoc = &stcb->asoc; 4000 4001 /* Get the number. */ 4002 seq = ntohl(str_add->request_seq); 4003 num_stream = ntohs(str_add->number_of_streams); 4004 /* Now what would be the new total? */ 4005 if (asoc->str_reset_seq_in == seq) { 4006 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4007 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4008 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4009 } else if (stcb->asoc.stream_reset_outstanding) { 4010 /* We must reject it we have something pending */ 4011 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4012 } else { 4013 /* Ok, we can do that :-) */ 4014 int mychk; 4015 4016 mychk = stcb->asoc.streamoutcnt; 4017 mychk += num_stream; 4018 if (mychk < 0x10000) { 4019 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4020 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4021 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4022 } 4023 } else { 4024 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4025 } 4026 } 4027 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4028 asoc->str_reset_seq_in++; 4029 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4030 /* 4031 * one seq back, just echo back last action since my 4032 * response was lost. 4033 */ 4034 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4035 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4036 /* 4037 * two seq back, just echo back last action since my 4038 * response was lost. 4039 */ 4040 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4041 } else { 4042 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4043 } 4044 } 4045 4046 #ifdef __GNUC__ 4047 __attribute__((noinline)) 4048 #endif 4049 static int 4050 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4051 struct sctp_stream_reset_out_req *sr_req) 4052 { 4053 int chk_length, param_len, ptype; 4054 struct sctp_paramhdr pstore; 4055 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4056 uint32_t seq = 0; 4057 int num_req = 0; 4058 int trunc = 0; 4059 struct sctp_tmit_chunk *chk; 4060 struct sctp_chunkhdr *ch; 4061 struct sctp_paramhdr *ph; 4062 int ret_code = 0; 4063 int num_param = 0; 4064 4065 /* now it may be a reset or a reset-response */ 4066 chk_length = ntohs(sr_req->ch.chunk_length); 4067 4068 /* setup for adding the response */ 4069 sctp_alloc_a_chunk(stcb, chk); 4070 if (chk == NULL) { 4071 return (ret_code); 4072 } 4073 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4074 chk->rec.chunk_id.can_take_data = 0; 4075 chk->asoc = &stcb->asoc; 4076 chk->no_fr_allowed = 0; 4077 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4078 chk->book_size_scale = 0; 4079 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4080 if (chk->data == NULL) { 4081 strres_nochunk: 4082 if (chk->data) { 4083 sctp_m_freem(chk->data); 4084 chk->data = NULL; 4085 } 4086 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4087 return (ret_code); 4088 } 4089 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4090 4091 /* setup chunk parameters */ 4092 chk->sent = SCTP_DATAGRAM_UNSENT; 4093 chk->snd_count = 0; 4094 chk->whoTo = NULL; 4095 4096 ch = mtod(chk->data, struct sctp_chunkhdr *); 4097 ch->chunk_type = SCTP_STREAM_RESET; 4098 ch->chunk_flags = 0; 4099 ch->chunk_length = htons(chk->send_size); 4100 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4101 offset += sizeof(struct sctp_chunkhdr); 4102 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4103 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4104 if (ph == NULL) 4105 break; 4106 param_len = ntohs(ph->param_length); 4107 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4108 /* bad param */ 4109 break; 4110 } 4111 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4112 (uint8_t *) & cstore); 4113 ptype = ntohs(ph->param_type); 4114 num_param++; 4115 if (param_len > (int)sizeof(cstore)) { 4116 trunc = 1; 4117 } else { 4118 trunc = 0; 4119 } 4120 if (num_param > SCTP_MAX_RESET_PARAMS) { 4121 /* hit the max of parameters already sorry.. */ 4122 break; 4123 } 4124 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4125 struct sctp_stream_reset_out_request *req_out; 4126 4127 req_out = (struct sctp_stream_reset_out_request *)ph; 4128 num_req++; 4129 if (stcb->asoc.stream_reset_outstanding) { 4130 seq = ntohl(req_out->response_seq); 4131 if (seq == stcb->asoc.str_reset_seq_out) { 4132 /* implicit ack */ 4133 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4134 } 4135 } 4136 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4137 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4138 struct sctp_stream_reset_add_strm *str_add; 4139 4140 str_add = (struct sctp_stream_reset_add_strm *)ph; 4141 num_req++; 4142 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4143 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4144 struct sctp_stream_reset_add_strm *str_add; 4145 4146 str_add = (struct sctp_stream_reset_add_strm *)ph; 4147 num_req++; 4148 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4149 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4150 struct sctp_stream_reset_in_request *req_in; 4151 4152 num_req++; 4153 req_in = (struct sctp_stream_reset_in_request *)ph; 4154 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4155 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4156 struct sctp_stream_reset_tsn_request *req_tsn; 4157 4158 num_req++; 4159 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4160 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4161 ret_code = 1; 4162 goto strres_nochunk; 4163 } 4164 /* no more */ 4165 break; 4166 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4167 struct sctp_stream_reset_response *resp; 4168 uint32_t result; 4169 4170 resp = (struct sctp_stream_reset_response *)ph; 4171 seq = ntohl(resp->response_seq); 4172 result = ntohl(resp->result); 4173 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4174 ret_code = 1; 4175 goto strres_nochunk; 4176 } 4177 } else { 4178 break; 4179 } 4180 offset += SCTP_SIZE32(param_len); 4181 chk_length -= SCTP_SIZE32(param_len); 4182 } 4183 if (num_req == 0) { 4184 /* we have no response free the stuff */ 4185 goto strres_nochunk; 4186 } 4187 /* ok we have a chunk to link in */ 4188 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4189 chk, 4190 sctp_next); 4191 stcb->asoc.ctrl_queue_cnt++; 4192 return (ret_code); 4193 } 4194 4195 /* 4196 * Handle a router or endpoints report of a packet loss, there are two ways 4197 * to handle this, either we get the whole packet and must disect it 4198 * ourselves (possibly with truncation and or corruption) or it is a summary 4199 * from a middle box that did the disectting for us. 4200 */ 4201 static void 4202 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4203 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4204 { 4205 uint32_t bottle_bw, on_queue; 4206 uint16_t trunc_len; 4207 unsigned int chlen; 4208 unsigned int at; 4209 struct sctp_chunk_desc desc; 4210 struct sctp_chunkhdr *ch; 4211 4212 chlen = ntohs(cp->ch.chunk_length); 4213 chlen -= sizeof(struct sctp_pktdrop_chunk); 4214 /* XXX possible chlen underflow */ 4215 if (chlen == 0) { 4216 ch = NULL; 4217 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4218 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4219 } else { 4220 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4221 chlen -= sizeof(struct sctphdr); 4222 /* XXX possible chlen underflow */ 4223 memset(&desc, 0, sizeof(desc)); 4224 } 4225 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4226 if (trunc_len > limit) { 4227 trunc_len = limit; 4228 } 4229 /* now the chunks themselves */ 4230 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4231 desc.chunk_type = ch->chunk_type; 4232 /* get amount we need to move */ 4233 at = ntohs(ch->chunk_length); 4234 if (at < sizeof(struct sctp_chunkhdr)) { 4235 /* corrupt chunk, maybe at the end? */ 4236 SCTP_STAT_INCR(sctps_pdrpcrupt); 4237 break; 4238 } 4239 if (trunc_len == 0) { 4240 /* we are supposed to have all of it */ 4241 if (at > chlen) { 4242 /* corrupt skip it */ 4243 SCTP_STAT_INCR(sctps_pdrpcrupt); 4244 break; 4245 } 4246 } else { 4247 /* is there enough of it left ? */ 4248 if (desc.chunk_type == SCTP_DATA) { 4249 if (chlen < (sizeof(struct sctp_data_chunk) + 4250 sizeof(desc.data_bytes))) { 4251 break; 4252 } 4253 } else { 4254 if (chlen < sizeof(struct sctp_chunkhdr)) { 4255 break; 4256 } 4257 } 4258 } 4259 if (desc.chunk_type == SCTP_DATA) { 4260 /* can we get out the tsn? */ 4261 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4262 SCTP_STAT_INCR(sctps_pdrpmbda); 4263 4264 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4265 /* yep */ 4266 struct sctp_data_chunk *dcp; 4267 uint8_t *ddp; 4268 unsigned int iii; 4269 4270 dcp = (struct sctp_data_chunk *)ch; 4271 ddp = (uint8_t *) (dcp + 1); 4272 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4273 desc.data_bytes[iii] = ddp[iii]; 4274 } 4275 desc.tsn_ifany = dcp->dp.tsn; 4276 } else { 4277 /* nope we are done. */ 4278 SCTP_STAT_INCR(sctps_pdrpnedat); 4279 break; 4280 } 4281 } else { 4282 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4283 SCTP_STAT_INCR(sctps_pdrpmbct); 4284 } 4285 4286 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4287 SCTP_STAT_INCR(sctps_pdrppdbrk); 4288 break; 4289 } 4290 if (SCTP_SIZE32(at) > chlen) { 4291 break; 4292 } 4293 chlen -= SCTP_SIZE32(at); 4294 if (chlen < sizeof(struct sctp_chunkhdr)) { 4295 /* done, none left */ 4296 break; 4297 } 4298 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4299 } 4300 /* Now update any rwnd --- possibly */ 4301 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4302 /* From a peer, we get a rwnd report */ 4303 uint32_t a_rwnd; 4304 4305 SCTP_STAT_INCR(sctps_pdrpfehos); 4306 4307 bottle_bw = ntohl(cp->bottle_bw); 4308 on_queue = ntohl(cp->current_onq); 4309 if (bottle_bw && on_queue) { 4310 /* a rwnd report is in here */ 4311 if (bottle_bw > on_queue) 4312 a_rwnd = bottle_bw - on_queue; 4313 else 4314 a_rwnd = 0; 4315 4316 if (a_rwnd == 0) 4317 stcb->asoc.peers_rwnd = 0; 4318 else { 4319 if (a_rwnd > stcb->asoc.total_flight) { 4320 stcb->asoc.peers_rwnd = 4321 a_rwnd - stcb->asoc.total_flight; 4322 } else { 4323 stcb->asoc.peers_rwnd = 0; 4324 } 4325 if (stcb->asoc.peers_rwnd < 4326 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4327 /* SWS sender side engages */ 4328 stcb->asoc.peers_rwnd = 0; 4329 } 4330 } 4331 } 4332 } else { 4333 SCTP_STAT_INCR(sctps_pdrpfmbox); 4334 } 4335 4336 /* now middle boxes in sat networks get a cwnd bump */ 4337 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4338 (stcb->asoc.sat_t3_loss_recovery == 0) && 4339 (stcb->asoc.sat_network)) { 4340 /* 4341 * This is debateable but for sat networks it makes sense 4342 * Note if a T3 timer has went off, we will prohibit any 4343 * changes to cwnd until we exit the t3 loss recovery. 4344 */ 4345 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4346 net, cp, &bottle_bw, &on_queue); 4347 } 4348 } 4349 4350 /* 4351 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4352 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4353 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4354 * length of the complete packet outputs: - length: modified to remaining 4355 * length after control processing - netp: modified to new sctp_nets after 4356 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4357 * bad packet,...) otherwise return the tcb for this packet 4358 */ 4359 #ifdef __GNUC__ 4360 __attribute__((noinline)) 4361 #endif 4362 static struct sctp_tcb * 4363 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4364 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4365 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4366 uint32_t vrf_id, uint16_t port) 4367 { 4368 struct sctp_association *asoc; 4369 uint32_t vtag_in; 4370 int num_chunks = 0; /* number of control chunks processed */ 4371 uint32_t chk_length; 4372 int ret; 4373 int abort_no_unlock = 0; 4374 int ecne_seen = 0; 4375 4376 /* 4377 * How big should this be, and should it be alloc'd? Lets try the 4378 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4379 * until we get into jumbo grams and such.. 4380 */ 4381 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4382 struct sctp_tcb *locked_tcb = stcb; 4383 int got_auth = 0; 4384 uint32_t auth_offset = 0, auth_len = 0; 4385 int auth_skipped = 0; 4386 int asconf_cnt = 0; 4387 4388 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4389 struct socket *so; 4390 4391 #endif 4392 4393 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4394 iphlen, *offset, length, stcb); 4395 4396 /* validate chunk header length... */ 4397 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4398 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4399 ntohs(ch->chunk_length)); 4400 if (locked_tcb) { 4401 SCTP_TCB_UNLOCK(locked_tcb); 4402 } 4403 return (NULL); 4404 } 4405 /* 4406 * validate the verification tag 4407 */ 4408 vtag_in = ntohl(sh->v_tag); 4409 4410 if (locked_tcb) { 4411 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4412 } 4413 if (ch->chunk_type == SCTP_INITIATION) { 4414 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4415 ntohs(ch->chunk_length), vtag_in); 4416 if (vtag_in != 0) { 4417 /* protocol error- silently discard... */ 4418 SCTP_STAT_INCR(sctps_badvtag); 4419 if (locked_tcb) { 4420 SCTP_TCB_UNLOCK(locked_tcb); 4421 } 4422 return (NULL); 4423 } 4424 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4425 /* 4426 * If there is no stcb, skip the AUTH chunk and process 4427 * later after a stcb is found (to validate the lookup was 4428 * valid. 4429 */ 4430 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4431 (stcb == NULL) && 4432 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4433 /* save this chunk for later processing */ 4434 auth_skipped = 1; 4435 auth_offset = *offset; 4436 auth_len = ntohs(ch->chunk_length); 4437 4438 /* (temporarily) move past this chunk */ 4439 *offset += SCTP_SIZE32(auth_len); 4440 if (*offset >= length) { 4441 /* no more data left in the mbuf chain */ 4442 *offset = length; 4443 if (locked_tcb) { 4444 SCTP_TCB_UNLOCK(locked_tcb); 4445 } 4446 return (NULL); 4447 } 4448 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4449 sizeof(struct sctp_chunkhdr), chunk_buf); 4450 } 4451 if (ch == NULL) { 4452 /* Help */ 4453 *offset = length; 4454 if (locked_tcb) { 4455 SCTP_TCB_UNLOCK(locked_tcb); 4456 } 4457 return (NULL); 4458 } 4459 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4460 goto process_control_chunks; 4461 } 4462 /* 4463 * first check if it's an ASCONF with an unknown src addr we 4464 * need to look inside to find the association 4465 */ 4466 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4467 struct sctp_chunkhdr *asconf_ch = ch; 4468 uint32_t asconf_offset = 0, asconf_len = 0; 4469 4470 /* inp's refcount may be reduced */ 4471 SCTP_INP_INCR_REF(inp); 4472 4473 asconf_offset = *offset; 4474 do { 4475 asconf_len = ntohs(asconf_ch->chunk_length); 4476 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4477 break; 4478 stcb = sctp_findassociation_ep_asconf(m, 4479 *offset, sh, &inp, netp, vrf_id); 4480 if (stcb != NULL) 4481 break; 4482 asconf_offset += SCTP_SIZE32(asconf_len); 4483 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4484 sizeof(struct sctp_chunkhdr), chunk_buf); 4485 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4486 if (stcb == NULL) { 4487 /* 4488 * reduce inp's refcount if not reduced in 4489 * sctp_findassociation_ep_asconf(). 4490 */ 4491 SCTP_INP_DECR_REF(inp); 4492 } else { 4493 locked_tcb = stcb; 4494 } 4495 4496 /* now go back and verify any auth chunk to be sure */ 4497 if (auth_skipped && (stcb != NULL)) { 4498 struct sctp_auth_chunk *auth; 4499 4500 auth = (struct sctp_auth_chunk *) 4501 sctp_m_getptr(m, auth_offset, 4502 auth_len, chunk_buf); 4503 got_auth = 1; 4504 auth_skipped = 0; 4505 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4506 auth_offset)) { 4507 /* auth HMAC failed so dump it */ 4508 *offset = length; 4509 if (locked_tcb) { 4510 SCTP_TCB_UNLOCK(locked_tcb); 4511 } 4512 return (NULL); 4513 } else { 4514 /* remaining chunks are HMAC checked */ 4515 stcb->asoc.authenticated = 1; 4516 } 4517 } 4518 } 4519 if (stcb == NULL) { 4520 /* no association, so it's out of the blue... */ 4521 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4522 vrf_id, port); 4523 *offset = length; 4524 if (locked_tcb) { 4525 SCTP_TCB_UNLOCK(locked_tcb); 4526 } 4527 return (NULL); 4528 } 4529 asoc = &stcb->asoc; 4530 /* ABORT and SHUTDOWN can use either v_tag... */ 4531 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4532 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4533 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4534 if ((vtag_in == asoc->my_vtag) || 4535 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4536 (vtag_in == asoc->peer_vtag))) { 4537 /* this is valid */ 4538 } else { 4539 /* drop this packet... */ 4540 SCTP_STAT_INCR(sctps_badvtag); 4541 if (locked_tcb) { 4542 SCTP_TCB_UNLOCK(locked_tcb); 4543 } 4544 return (NULL); 4545 } 4546 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4547 if (vtag_in != asoc->my_vtag) { 4548 /* 4549 * this could be a stale SHUTDOWN-ACK or the 4550 * peer never got the SHUTDOWN-COMPLETE and 4551 * is still hung; we have started a new asoc 4552 * but it won't complete until the shutdown 4553 * is completed 4554 */ 4555 if (locked_tcb) { 4556 SCTP_TCB_UNLOCK(locked_tcb); 4557 } 4558 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4559 NULL, vrf_id, port); 4560 return (NULL); 4561 } 4562 } else { 4563 /* for all other chunks, vtag must match */ 4564 if (vtag_in != asoc->my_vtag) { 4565 /* invalid vtag... */ 4566 SCTPDBG(SCTP_DEBUG_INPUT3, 4567 "invalid vtag: %xh, expect %xh\n", 4568 vtag_in, asoc->my_vtag); 4569 SCTP_STAT_INCR(sctps_badvtag); 4570 if (locked_tcb) { 4571 SCTP_TCB_UNLOCK(locked_tcb); 4572 } 4573 *offset = length; 4574 return (NULL); 4575 } 4576 } 4577 } /* end if !SCTP_COOKIE_ECHO */ 4578 /* 4579 * process all control chunks... 4580 */ 4581 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4582 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4583 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4584 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4585 /* implied cookie-ack.. we must have lost the ack */ 4586 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4587 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4588 stcb->asoc.overall_error_count, 4589 0, 4590 SCTP_FROM_SCTP_INPUT, 4591 __LINE__); 4592 } 4593 stcb->asoc.overall_error_count = 0; 4594 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4595 *netp); 4596 } 4597 process_control_chunks: 4598 while (IS_SCTP_CONTROL(ch)) { 4599 /* validate chunk length */ 4600 chk_length = ntohs(ch->chunk_length); 4601 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4602 ch->chunk_type, chk_length); 4603 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4604 if (chk_length < sizeof(*ch) || 4605 (*offset + (int)chk_length) > length) { 4606 *offset = length; 4607 if (locked_tcb) { 4608 SCTP_TCB_UNLOCK(locked_tcb); 4609 } 4610 return (NULL); 4611 } 4612 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4613 /* 4614 * INIT-ACK only gets the init ack "header" portion only 4615 * because we don't have to process the peer's COOKIE. All 4616 * others get a complete chunk. 4617 */ 4618 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4619 (ch->chunk_type == SCTP_INITIATION)) { 4620 /* get an init-ack chunk */ 4621 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4622 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4623 if (ch == NULL) { 4624 *offset = length; 4625 if (locked_tcb) { 4626 SCTP_TCB_UNLOCK(locked_tcb); 4627 } 4628 return (NULL); 4629 } 4630 } else { 4631 /* For cookies and all other chunks. */ 4632 if (chk_length > sizeof(chunk_buf)) { 4633 /* 4634 * use just the size of the chunk buffer so 4635 * the front part of our chunks fit in 4636 * contiguous space up to the chunk buffer 4637 * size (508 bytes). For chunks that need to 4638 * get more than that they must use the 4639 * sctp_m_getptr() function or other means 4640 * (e.g. know how to parse mbuf chains). 4641 * Cookies do this already. 4642 */ 4643 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4644 (sizeof(chunk_buf) - 4), 4645 chunk_buf); 4646 if (ch == NULL) { 4647 *offset = length; 4648 if (locked_tcb) { 4649 SCTP_TCB_UNLOCK(locked_tcb); 4650 } 4651 return (NULL); 4652 } 4653 } else { 4654 /* We can fit it all */ 4655 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4656 chk_length, chunk_buf); 4657 if (ch == NULL) { 4658 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4659 *offset = length; 4660 if (locked_tcb) { 4661 SCTP_TCB_UNLOCK(locked_tcb); 4662 } 4663 return (NULL); 4664 } 4665 } 4666 } 4667 num_chunks++; 4668 /* Save off the last place we got a control from */ 4669 if (stcb != NULL) { 4670 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4671 /* 4672 * allow last_control to be NULL if 4673 * ASCONF... ASCONF processing will find the 4674 * right net later 4675 */ 4676 if ((netp != NULL) && (*netp != NULL)) 4677 stcb->asoc.last_control_chunk_from = *netp; 4678 } 4679 } 4680 #ifdef SCTP_AUDITING_ENABLED 4681 sctp_audit_log(0xB0, ch->chunk_type); 4682 #endif 4683 4684 /* check to see if this chunk required auth, but isn't */ 4685 if ((stcb != NULL) && 4686 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4687 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4688 !stcb->asoc.authenticated) { 4689 /* "silently" ignore */ 4690 SCTP_STAT_INCR(sctps_recvauthmissing); 4691 goto next_chunk; 4692 } 4693 switch (ch->chunk_type) { 4694 case SCTP_INITIATION: 4695 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4696 /* The INIT chunk must be the only chunk. */ 4697 if ((num_chunks > 1) || 4698 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4699 sctp_abort_association(inp, stcb, m, 4700 iphlen, sh, NULL, vrf_id, port); 4701 *offset = length; 4702 return (NULL); 4703 } 4704 /* Honor our resource limit. */ 4705 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4706 struct mbuf *op_err; 4707 4708 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4709 sctp_abort_association(inp, stcb, m, 4710 iphlen, sh, op_err, vrf_id, port); 4711 *offset = length; 4712 return (NULL); 4713 } 4714 sctp_handle_init(m, iphlen, *offset, sh, 4715 (struct sctp_init_chunk *)ch, inp, 4716 stcb, &abort_no_unlock, vrf_id, port); 4717 *offset = length; 4718 if ((!abort_no_unlock) && (locked_tcb)) { 4719 SCTP_TCB_UNLOCK(locked_tcb); 4720 } 4721 return (NULL); 4722 break; 4723 case SCTP_PAD_CHUNK: 4724 break; 4725 case SCTP_INITIATION_ACK: 4726 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4727 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4728 /* We are not interested anymore */ 4729 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4730 ; 4731 } else { 4732 if (locked_tcb != stcb) { 4733 /* Very unlikely */ 4734 SCTP_TCB_UNLOCK(locked_tcb); 4735 } 4736 *offset = length; 4737 if (stcb) { 4738 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4739 so = SCTP_INP_SO(inp); 4740 atomic_add_int(&stcb->asoc.refcnt, 1); 4741 SCTP_TCB_UNLOCK(stcb); 4742 SCTP_SOCKET_LOCK(so, 1); 4743 SCTP_TCB_LOCK(stcb); 4744 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4745 #endif 4746 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4748 SCTP_SOCKET_UNLOCK(so, 1); 4749 #endif 4750 } 4751 return (NULL); 4752 } 4753 } 4754 /* The INIT-ACK chunk must be the only chunk. */ 4755 if ((num_chunks > 1) || 4756 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4757 *offset = length; 4758 if (locked_tcb) { 4759 SCTP_TCB_UNLOCK(locked_tcb); 4760 } 4761 return (NULL); 4762 } 4763 if ((netp) && (*netp)) { 4764 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4765 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4766 } else { 4767 ret = -1; 4768 } 4769 *offset = length; 4770 if (abort_no_unlock) { 4771 return (NULL); 4772 } 4773 /* 4774 * Special case, I must call the output routine to 4775 * get the cookie echoed 4776 */ 4777 if ((stcb != NULL) && (ret == 0)) { 4778 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4779 } 4780 if (locked_tcb) { 4781 SCTP_TCB_UNLOCK(locked_tcb); 4782 } 4783 return (NULL); 4784 break; 4785 case SCTP_SELECTIVE_ACK: 4786 { 4787 struct sctp_sack_chunk *sack; 4788 int abort_now = 0; 4789 uint32_t a_rwnd, cum_ack; 4790 uint16_t num_seg, num_dup; 4791 uint8_t flags; 4792 int offset_seg, offset_dup; 4793 4794 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4795 SCTP_STAT_INCR(sctps_recvsacks); 4796 if (stcb == NULL) { 4797 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4798 break; 4799 } 4800 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4801 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4802 break; 4803 } 4804 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4805 /*- 4806 * If we have sent a shutdown-ack, we will pay no 4807 * attention to a sack sent in to us since 4808 * we don't care anymore. 4809 */ 4810 break; 4811 } 4812 sack = (struct sctp_sack_chunk *)ch; 4813 flags = ch->chunk_flags; 4814 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4815 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4816 num_dup = ntohs(sack->sack.num_dup_tsns); 4817 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4818 if (sizeof(struct sctp_sack_chunk) + 4819 num_seg * sizeof(struct sctp_gap_ack_block) + 4820 num_dup * sizeof(uint32_t) != chk_length) { 4821 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4822 break; 4823 } 4824 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4825 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4826 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4827 cum_ack, num_seg, a_rwnd); 4828 stcb->asoc.seen_a_sack_this_pkt = 1; 4829 if ((stcb->asoc.pr_sctp_cnt == 0) && 4830 (num_seg == 0) && 4831 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4832 (stcb->asoc.saw_sack_with_frags == 0) && 4833 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4834 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4835 ) { 4836 /* 4837 * We have a SIMPLE sack having no 4838 * prior segments and data on sent 4839 * queue to be acked.. Use the 4840 * faster path sack processing. We 4841 * also allow window update sacks 4842 * with no missing segments to go 4843 * this way too. 4844 */ 4845 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4846 } else { 4847 if (netp && *netp) 4848 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4849 num_seg, 0, num_dup, &abort_now, flags, 4850 cum_ack, a_rwnd, ecne_seen); 4851 } 4852 if (abort_now) { 4853 /* ABORT signal from sack processing */ 4854 *offset = length; 4855 return (NULL); 4856 } 4857 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4858 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4859 (stcb->asoc.stream_queue_cnt == 0)) { 4860 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4861 } 4862 } 4863 break; 4864 /* 4865 * EY - nr_sack: If the received chunk is an 4866 * nr_sack chunk 4867 */ 4868 case SCTP_NR_SELECTIVE_ACK: 4869 { 4870 struct sctp_nr_sack_chunk *nr_sack; 4871 int abort_now = 0; 4872 uint32_t a_rwnd, cum_ack; 4873 uint16_t num_seg, num_nr_seg, num_dup; 4874 uint8_t flags; 4875 int offset_seg, offset_dup; 4876 4877 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4878 SCTP_STAT_INCR(sctps_recvsacks); 4879 if (stcb == NULL) { 4880 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4881 break; 4882 } 4883 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4884 (stcb->asoc.peer_supports_nr_sack == 0)) { 4885 goto unknown_chunk; 4886 } 4887 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4888 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4889 break; 4890 } 4891 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4892 /*- 4893 * If we have sent a shutdown-ack, we will pay no 4894 * attention to a sack sent in to us since 4895 * we don't care anymore. 4896 */ 4897 break; 4898 } 4899 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4900 flags = ch->chunk_flags; 4901 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4902 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4903 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4904 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4905 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4906 if (sizeof(struct sctp_nr_sack_chunk) + 4907 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4908 num_dup * sizeof(uint32_t) != chk_length) { 4909 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4910 break; 4911 } 4912 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4913 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4914 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4915 cum_ack, num_seg, a_rwnd); 4916 stcb->asoc.seen_a_sack_this_pkt = 1; 4917 if ((stcb->asoc.pr_sctp_cnt == 0) && 4918 (num_seg == 0) && (num_nr_seg == 0) && 4919 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4920 (stcb->asoc.saw_sack_with_frags == 0) && 4921 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4922 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4923 /* 4924 * We have a SIMPLE sack having no 4925 * prior segments and data on sent 4926 * queue to be acked. Use the faster 4927 * path sack processing. We also 4928 * allow window update sacks with no 4929 * missing segments to go this way 4930 * too. 4931 */ 4932 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4933 &abort_now, ecne_seen); 4934 } else { 4935 if (netp && *netp) 4936 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4937 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4938 cum_ack, a_rwnd, ecne_seen); 4939 } 4940 if (abort_now) { 4941 /* ABORT signal from sack processing */ 4942 *offset = length; 4943 return (NULL); 4944 } 4945 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4946 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4947 (stcb->asoc.stream_queue_cnt == 0)) { 4948 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4949 } 4950 } 4951 break; 4952 4953 case SCTP_HEARTBEAT_REQUEST: 4954 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4955 if ((stcb) && netp && *netp) { 4956 SCTP_STAT_INCR(sctps_recvheartbeat); 4957 sctp_send_heartbeat_ack(stcb, m, *offset, 4958 chk_length, *netp); 4959 4960 /* He's alive so give him credit */ 4961 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4962 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4963 stcb->asoc.overall_error_count, 4964 0, 4965 SCTP_FROM_SCTP_INPUT, 4966 __LINE__); 4967 } 4968 stcb->asoc.overall_error_count = 0; 4969 } 4970 break; 4971 case SCTP_HEARTBEAT_ACK: 4972 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4973 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4974 /* Its not ours */ 4975 *offset = length; 4976 if (locked_tcb) { 4977 SCTP_TCB_UNLOCK(locked_tcb); 4978 } 4979 return (NULL); 4980 } 4981 /* He's alive so give him credit */ 4982 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4983 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4984 stcb->asoc.overall_error_count, 4985 0, 4986 SCTP_FROM_SCTP_INPUT, 4987 __LINE__); 4988 } 4989 stcb->asoc.overall_error_count = 0; 4990 SCTP_STAT_INCR(sctps_recvheartbeatack); 4991 if (netp && *netp) 4992 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4993 stcb, *netp); 4994 break; 4995 case SCTP_ABORT_ASSOCIATION: 4996 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4997 stcb); 4998 if ((stcb) && netp && *netp) 4999 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5000 stcb, *netp); 5001 *offset = length; 5002 return (NULL); 5003 break; 5004 case SCTP_SHUTDOWN: 5005 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5006 stcb); 5007 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5008 *offset = length; 5009 if (locked_tcb) { 5010 SCTP_TCB_UNLOCK(locked_tcb); 5011 } 5012 return (NULL); 5013 } 5014 if (netp && *netp) { 5015 int abort_flag = 0; 5016 5017 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5018 stcb, *netp, &abort_flag); 5019 if (abort_flag) { 5020 *offset = length; 5021 return (NULL); 5022 } 5023 } 5024 break; 5025 case SCTP_SHUTDOWN_ACK: 5026 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5027 if ((stcb) && (netp) && (*netp)) 5028 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5029 *offset = length; 5030 return (NULL); 5031 break; 5032 5033 case SCTP_OPERATION_ERROR: 5034 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5035 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5036 *offset = length; 5037 return (NULL); 5038 } 5039 break; 5040 case SCTP_COOKIE_ECHO: 5041 SCTPDBG(SCTP_DEBUG_INPUT3, 5042 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5043 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5044 ; 5045 } else { 5046 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5047 /* We are not interested anymore */ 5048 abend: 5049 if (stcb) { 5050 SCTP_TCB_UNLOCK(stcb); 5051 } 5052 *offset = length; 5053 return (NULL); 5054 } 5055 } 5056 /* 5057 * First are we accepting? We do this again here 5058 * since it is possible that a previous endpoint WAS 5059 * listening responded to a INIT-ACK and then 5060 * closed. We opened and bound.. and are now no 5061 * longer listening. 5062 */ 5063 5064 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5065 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5066 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5067 struct mbuf *op_err; 5068 5069 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5070 sctp_abort_association(inp, stcb, m, 5071 iphlen, sh, op_err, vrf_id, port); 5072 } 5073 *offset = length; 5074 return (NULL); 5075 } else { 5076 struct mbuf *ret_buf; 5077 struct sctp_inpcb *linp; 5078 5079 if (stcb) { 5080 linp = NULL; 5081 } else { 5082 linp = inp; 5083 } 5084 5085 if (linp) { 5086 SCTP_ASOC_CREATE_LOCK(linp); 5087 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5088 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5089 SCTP_ASOC_CREATE_UNLOCK(linp); 5090 goto abend; 5091 } 5092 } 5093 if (netp) { 5094 ret_buf = 5095 sctp_handle_cookie_echo(m, iphlen, 5096 *offset, sh, 5097 (struct sctp_cookie_echo_chunk *)ch, 5098 &inp, &stcb, netp, 5099 auth_skipped, 5100 auth_offset, 5101 auth_len, 5102 &locked_tcb, 5103 vrf_id, 5104 port); 5105 } else { 5106 ret_buf = NULL; 5107 } 5108 if (linp) { 5109 SCTP_ASOC_CREATE_UNLOCK(linp); 5110 } 5111 if (ret_buf == NULL) { 5112 if (locked_tcb) { 5113 SCTP_TCB_UNLOCK(locked_tcb); 5114 } 5115 SCTPDBG(SCTP_DEBUG_INPUT3, 5116 "GAK, null buffer\n"); 5117 *offset = length; 5118 return (NULL); 5119 } 5120 /* if AUTH skipped, see if it verified... */ 5121 if (auth_skipped) { 5122 got_auth = 1; 5123 auth_skipped = 0; 5124 } 5125 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5126 /* 5127 * Restart the timer if we have 5128 * pending data 5129 */ 5130 struct sctp_tmit_chunk *chk; 5131 5132 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5133 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5134 } 5135 } 5136 break; 5137 case SCTP_COOKIE_ACK: 5138 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5139 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5140 if (locked_tcb) { 5141 SCTP_TCB_UNLOCK(locked_tcb); 5142 } 5143 return (NULL); 5144 } 5145 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5146 /* We are not interested anymore */ 5147 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5148 ; 5149 } else if (stcb) { 5150 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5151 so = SCTP_INP_SO(inp); 5152 atomic_add_int(&stcb->asoc.refcnt, 1); 5153 SCTP_TCB_UNLOCK(stcb); 5154 SCTP_SOCKET_LOCK(so, 1); 5155 SCTP_TCB_LOCK(stcb); 5156 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5157 #endif 5158 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5159 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5160 SCTP_SOCKET_UNLOCK(so, 1); 5161 #endif 5162 *offset = length; 5163 return (NULL); 5164 } 5165 } 5166 /* He's alive so give him credit */ 5167 if ((stcb) && netp && *netp) { 5168 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5169 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5170 stcb->asoc.overall_error_count, 5171 0, 5172 SCTP_FROM_SCTP_INPUT, 5173 __LINE__); 5174 } 5175 stcb->asoc.overall_error_count = 0; 5176 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5177 } 5178 break; 5179 case SCTP_ECN_ECHO: 5180 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5181 /* He's alive so give him credit */ 5182 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5183 /* Its not ours */ 5184 if (locked_tcb) { 5185 SCTP_TCB_UNLOCK(locked_tcb); 5186 } 5187 *offset = length; 5188 return (NULL); 5189 } 5190 if (stcb) { 5191 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5192 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5193 stcb->asoc.overall_error_count, 5194 0, 5195 SCTP_FROM_SCTP_INPUT, 5196 __LINE__); 5197 } 5198 stcb->asoc.overall_error_count = 0; 5199 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5200 stcb); 5201 ecne_seen = 1; 5202 } 5203 break; 5204 case SCTP_ECN_CWR: 5205 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5206 /* He's alive so give him credit */ 5207 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5208 /* Its not ours */ 5209 if (locked_tcb) { 5210 SCTP_TCB_UNLOCK(locked_tcb); 5211 } 5212 *offset = length; 5213 return (NULL); 5214 } 5215 if (stcb) { 5216 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5217 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5218 stcb->asoc.overall_error_count, 5219 0, 5220 SCTP_FROM_SCTP_INPUT, 5221 __LINE__); 5222 } 5223 stcb->asoc.overall_error_count = 0; 5224 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5225 } 5226 break; 5227 case SCTP_SHUTDOWN_COMPLETE: 5228 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5229 /* must be first and only chunk */ 5230 if ((num_chunks > 1) || 5231 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5232 *offset = length; 5233 if (locked_tcb) { 5234 SCTP_TCB_UNLOCK(locked_tcb); 5235 } 5236 return (NULL); 5237 } 5238 if ((stcb) && netp && *netp) { 5239 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5240 stcb, *netp); 5241 } 5242 *offset = length; 5243 return (NULL); 5244 break; 5245 case SCTP_ASCONF: 5246 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5247 /* He's alive so give him credit */ 5248 if (stcb) { 5249 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5250 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5251 stcb->asoc.overall_error_count, 5252 0, 5253 SCTP_FROM_SCTP_INPUT, 5254 __LINE__); 5255 } 5256 stcb->asoc.overall_error_count = 0; 5257 sctp_handle_asconf(m, *offset, 5258 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5259 asconf_cnt++; 5260 } 5261 break; 5262 case SCTP_ASCONF_ACK: 5263 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5264 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5265 /* Its not ours */ 5266 if (locked_tcb) { 5267 SCTP_TCB_UNLOCK(locked_tcb); 5268 } 5269 *offset = length; 5270 return (NULL); 5271 } 5272 if ((stcb) && netp && *netp) { 5273 /* He's alive so give him credit */ 5274 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5275 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5276 stcb->asoc.overall_error_count, 5277 0, 5278 SCTP_FROM_SCTP_INPUT, 5279 __LINE__); 5280 } 5281 stcb->asoc.overall_error_count = 0; 5282 sctp_handle_asconf_ack(m, *offset, 5283 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5284 if (abort_no_unlock) 5285 return (NULL); 5286 } 5287 break; 5288 case SCTP_FORWARD_CUM_TSN: 5289 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5290 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5291 /* Its not ours */ 5292 if (locked_tcb) { 5293 SCTP_TCB_UNLOCK(locked_tcb); 5294 } 5295 *offset = length; 5296 return (NULL); 5297 } 5298 /* He's alive so give him credit */ 5299 if (stcb) { 5300 int abort_flag = 0; 5301 5302 stcb->asoc.overall_error_count = 0; 5303 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5304 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5305 stcb->asoc.overall_error_count, 5306 0, 5307 SCTP_FROM_SCTP_INPUT, 5308 __LINE__); 5309 } 5310 *fwd_tsn_seen = 1; 5311 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5312 /* We are not interested anymore */ 5313 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5314 so = SCTP_INP_SO(inp); 5315 atomic_add_int(&stcb->asoc.refcnt, 1); 5316 SCTP_TCB_UNLOCK(stcb); 5317 SCTP_SOCKET_LOCK(so, 1); 5318 SCTP_TCB_LOCK(stcb); 5319 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5320 #endif 5321 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5322 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5323 SCTP_SOCKET_UNLOCK(so, 1); 5324 #endif 5325 *offset = length; 5326 return (NULL); 5327 } 5328 sctp_handle_forward_tsn(stcb, 5329 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5330 if (abort_flag) { 5331 *offset = length; 5332 return (NULL); 5333 } else { 5334 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5335 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5336 stcb->asoc.overall_error_count, 5337 0, 5338 SCTP_FROM_SCTP_INPUT, 5339 __LINE__); 5340 } 5341 stcb->asoc.overall_error_count = 0; 5342 } 5343 5344 } 5345 break; 5346 case SCTP_STREAM_RESET: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5348 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5349 /* Its not ours */ 5350 if (locked_tcb) { 5351 SCTP_TCB_UNLOCK(locked_tcb); 5352 } 5353 *offset = length; 5354 return (NULL); 5355 } 5356 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5357 /* We are not interested anymore */ 5358 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5359 so = SCTP_INP_SO(inp); 5360 atomic_add_int(&stcb->asoc.refcnt, 1); 5361 SCTP_TCB_UNLOCK(stcb); 5362 SCTP_SOCKET_LOCK(so, 1); 5363 SCTP_TCB_LOCK(stcb); 5364 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5365 #endif 5366 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5367 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5368 SCTP_SOCKET_UNLOCK(so, 1); 5369 #endif 5370 *offset = length; 5371 return (NULL); 5372 } 5373 if (stcb->asoc.peer_supports_strreset == 0) { 5374 /* 5375 * hmm, peer should have announced this, but 5376 * we will turn it on since he is sending us 5377 * a stream reset. 5378 */ 5379 stcb->asoc.peer_supports_strreset = 1; 5380 } 5381 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5382 /* stop processing */ 5383 *offset = length; 5384 return (NULL); 5385 } 5386 break; 5387 case SCTP_PACKET_DROPPED: 5388 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5389 /* re-get it all please */ 5390 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5391 /* Its not ours */ 5392 if (locked_tcb) { 5393 SCTP_TCB_UNLOCK(locked_tcb); 5394 } 5395 *offset = length; 5396 return (NULL); 5397 } 5398 if (ch && (stcb) && netp && (*netp)) { 5399 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5400 stcb, *netp, 5401 min(chk_length, (sizeof(chunk_buf) - 4))); 5402 5403 } 5404 break; 5405 5406 case SCTP_AUTHENTICATION: 5407 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5408 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5409 goto unknown_chunk; 5410 5411 if (stcb == NULL) { 5412 /* save the first AUTH for later processing */ 5413 if (auth_skipped == 0) { 5414 auth_offset = *offset; 5415 auth_len = chk_length; 5416 auth_skipped = 1; 5417 } 5418 /* skip this chunk (temporarily) */ 5419 goto next_chunk; 5420 } 5421 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5422 (chk_length > (sizeof(struct sctp_auth_chunk) + 5423 SCTP_AUTH_DIGEST_LEN_MAX))) { 5424 /* Its not ours */ 5425 if (locked_tcb) { 5426 SCTP_TCB_UNLOCK(locked_tcb); 5427 } 5428 *offset = length; 5429 return (NULL); 5430 } 5431 if (got_auth == 1) { 5432 /* skip this chunk... it's already auth'd */ 5433 goto next_chunk; 5434 } 5435 got_auth = 1; 5436 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5437 m, *offset)) { 5438 /* auth HMAC failed so dump the packet */ 5439 *offset = length; 5440 return (stcb); 5441 } else { 5442 /* remaining chunks are HMAC checked */ 5443 stcb->asoc.authenticated = 1; 5444 } 5445 break; 5446 5447 default: 5448 unknown_chunk: 5449 /* it's an unknown chunk! */ 5450 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5451 struct mbuf *mm; 5452 struct sctp_paramhdr *phd; 5453 5454 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5455 0, M_DONTWAIT, 1, MT_DATA); 5456 if (mm) { 5457 phd = mtod(mm, struct sctp_paramhdr *); 5458 /* 5459 * We cheat and use param type since 5460 * we did not bother to define a 5461 * error cause struct. They are the 5462 * same basic format with different 5463 * names. 5464 */ 5465 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5466 phd->param_length = htons(chk_length + sizeof(*phd)); 5467 SCTP_BUF_LEN(mm) = sizeof(*phd); 5468 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5469 if (SCTP_BUF_NEXT(mm)) { 5470 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5471 sctp_m_freem(mm); 5472 } else { 5473 #ifdef SCTP_MBUF_LOGGING 5474 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5475 struct mbuf *mat; 5476 5477 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5478 if (SCTP_BUF_IS_EXTENDED(mat)) { 5479 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5480 } 5481 } 5482 } 5483 #endif 5484 sctp_queue_op_err(stcb, mm); 5485 } 5486 } else { 5487 sctp_m_freem(mm); 5488 } 5489 } 5490 } 5491 if ((ch->chunk_type & 0x80) == 0) { 5492 /* discard this packet */ 5493 *offset = length; 5494 return (stcb); 5495 } /* else skip this bad chunk and continue... */ 5496 break; 5497 } /* switch (ch->chunk_type) */ 5498 5499 5500 next_chunk: 5501 /* get the next chunk */ 5502 *offset += SCTP_SIZE32(chk_length); 5503 if (*offset >= length) { 5504 /* no more data left in the mbuf chain */ 5505 break; 5506 } 5507 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5508 sizeof(struct sctp_chunkhdr), chunk_buf); 5509 if (ch == NULL) { 5510 if (locked_tcb) { 5511 SCTP_TCB_UNLOCK(locked_tcb); 5512 } 5513 *offset = length; 5514 return (NULL); 5515 } 5516 } /* while */ 5517 5518 if (asconf_cnt > 0 && stcb != NULL) { 5519 sctp_send_asconf_ack(stcb); 5520 } 5521 return (stcb); 5522 } 5523 5524 5525 #ifdef INVARIANTS 5526 #ifdef __GNUC__ 5527 __attribute__((noinline)) 5528 #endif 5529 void 5530 sctp_validate_no_locks(struct sctp_inpcb *inp) 5531 { 5532 struct sctp_tcb *lstcb; 5533 5534 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5535 if (mtx_owned(&lstcb->tcb_mtx)) { 5536 panic("Own lock on stcb at return from input"); 5537 } 5538 } 5539 if (mtx_owned(&inp->inp_create_mtx)) { 5540 panic("Own create lock on inp"); 5541 } 5542 if (mtx_owned(&inp->inp_mtx)) { 5543 panic("Own inp lock on inp"); 5544 } 5545 } 5546 5547 #endif 5548 5549 /* 5550 * common input chunk processing (v4 and v6) 5551 */ 5552 void 5553 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5554 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5555 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5556 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5557 { 5558 /* 5559 * Control chunk processing 5560 */ 5561 uint32_t high_tsn; 5562 int fwd_tsn_seen = 0, data_processed = 0; 5563 struct mbuf *m = *mm; 5564 int un_sent; 5565 int cnt_ctrl_ready = 0; 5566 5567 SCTP_STAT_INCR(sctps_recvdatagrams); 5568 #ifdef SCTP_AUDITING_ENABLED 5569 sctp_audit_log(0xE0, 1); 5570 sctp_auditing(0, inp, stcb, net); 5571 #endif 5572 5573 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5574 m, iphlen, offset, length, stcb); 5575 if (stcb) { 5576 /* always clear this before beginning a packet */ 5577 stcb->asoc.authenticated = 0; 5578 stcb->asoc.seen_a_sack_this_pkt = 0; 5579 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5580 stcb, stcb->asoc.state); 5581 5582 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5583 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5584 /*- 5585 * If we hit here, we had a ref count 5586 * up when the assoc was aborted and the 5587 * timer is clearing out the assoc, we should 5588 * NOT respond to any packet.. its OOTB. 5589 */ 5590 SCTP_TCB_UNLOCK(stcb); 5591 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5592 vrf_id, port); 5593 goto out_now; 5594 } 5595 } 5596 if (IS_SCTP_CONTROL(ch)) { 5597 /* process the control portion of the SCTP packet */ 5598 /* sa_ignore NO_NULL_CHK */ 5599 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5600 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5601 if (stcb) { 5602 /* 5603 * This covers us if the cookie-echo was there and 5604 * it changes our INP. 5605 */ 5606 inp = stcb->sctp_ep; 5607 if ((net) && (port)) { 5608 if (net->port == 0) { 5609 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5610 } 5611 net->port = port; 5612 } 5613 } 5614 } else { 5615 /* 5616 * no control chunks, so pre-process DATA chunks (these 5617 * checks are taken care of by control processing) 5618 */ 5619 5620 /* 5621 * if DATA only packet, and auth is required, then punt... 5622 * can't have authenticated without any AUTH (control) 5623 * chunks 5624 */ 5625 if ((stcb != NULL) && 5626 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5627 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5628 /* "silently" ignore */ 5629 SCTP_STAT_INCR(sctps_recvauthmissing); 5630 SCTP_TCB_UNLOCK(stcb); 5631 goto out_now; 5632 } 5633 if (stcb == NULL) { 5634 /* out of the blue DATA chunk */ 5635 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5636 vrf_id, port); 5637 goto out_now; 5638 } 5639 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5640 /* v_tag mismatch! */ 5641 SCTP_STAT_INCR(sctps_badvtag); 5642 SCTP_TCB_UNLOCK(stcb); 5643 goto out_now; 5644 } 5645 } 5646 5647 if (stcb == NULL) { 5648 /* 5649 * no valid TCB for this packet, or we found it's a bad 5650 * packet while processing control, or we're done with this 5651 * packet (done or skip rest of data), so we drop it... 5652 */ 5653 goto out_now; 5654 } 5655 /* 5656 * DATA chunk processing 5657 */ 5658 /* plow through the data chunks while length > offset */ 5659 5660 /* 5661 * Rest should be DATA only. Check authentication state if AUTH for 5662 * DATA is required. 5663 */ 5664 if ((length > offset) && 5665 (stcb != NULL) && 5666 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5667 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5668 !stcb->asoc.authenticated) { 5669 /* "silently" ignore */ 5670 SCTP_STAT_INCR(sctps_recvauthmissing); 5671 SCTPDBG(SCTP_DEBUG_AUTH1, 5672 "Data chunk requires AUTH, skipped\n"); 5673 goto trigger_send; 5674 } 5675 if (length > offset) { 5676 int retval; 5677 5678 /* 5679 * First check to make sure our state is correct. We would 5680 * not get here unless we really did have a tag, so we don't 5681 * abort if this happens, just dump the chunk silently. 5682 */ 5683 switch (SCTP_GET_STATE(&stcb->asoc)) { 5684 case SCTP_STATE_COOKIE_ECHOED: 5685 /* 5686 * we consider data with valid tags in this state 5687 * shows us the cookie-ack was lost. Imply it was 5688 * there. 5689 */ 5690 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5691 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5692 stcb->asoc.overall_error_count, 5693 0, 5694 SCTP_FROM_SCTP_INPUT, 5695 __LINE__); 5696 } 5697 stcb->asoc.overall_error_count = 0; 5698 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5699 break; 5700 case SCTP_STATE_COOKIE_WAIT: 5701 /* 5702 * We consider OOTB any data sent during asoc setup. 5703 */ 5704 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5705 vrf_id, port); 5706 SCTP_TCB_UNLOCK(stcb); 5707 goto out_now; 5708 /* sa_ignore NOTREACHED */ 5709 break; 5710 case SCTP_STATE_EMPTY: /* should not happen */ 5711 case SCTP_STATE_INUSE: /* should not happen */ 5712 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5713 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5714 default: 5715 SCTP_TCB_UNLOCK(stcb); 5716 goto out_now; 5717 /* sa_ignore NOTREACHED */ 5718 break; 5719 case SCTP_STATE_OPEN: 5720 case SCTP_STATE_SHUTDOWN_SENT: 5721 break; 5722 } 5723 /* plow through the data chunks while length > offset */ 5724 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5725 inp, stcb, net, &high_tsn); 5726 if (retval == 2) { 5727 /* 5728 * The association aborted, NO UNLOCK needed since 5729 * the association is destroyed. 5730 */ 5731 goto out_now; 5732 } 5733 data_processed = 1; 5734 /* 5735 * Anything important needs to have been m_copy'ed in 5736 * process_data 5737 */ 5738 } 5739 /* take care of ecn */ 5740 if ((data_processed == 1) && 5741 (stcb->asoc.ecn_allowed == 1) && 5742 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5743 /* Yep, we need to add a ECNE */ 5744 sctp_send_ecn_echo(stcb, net, high_tsn); 5745 } 5746 if ((data_processed == 0) && (fwd_tsn_seen)) { 5747 int was_a_gap; 5748 uint32_t highest_tsn; 5749 5750 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5751 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5752 } else { 5753 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5754 } 5755 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5756 stcb->asoc.send_sack = 1; 5757 sctp_sack_check(stcb, was_a_gap); 5758 } else if (fwd_tsn_seen) { 5759 stcb->asoc.send_sack = 1; 5760 } 5761 /* trigger send of any chunks in queue... */ 5762 trigger_send: 5763 #ifdef SCTP_AUDITING_ENABLED 5764 sctp_audit_log(0xE0, 2); 5765 sctp_auditing(1, inp, stcb, net); 5766 #endif 5767 SCTPDBG(SCTP_DEBUG_INPUT1, 5768 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5769 stcb->asoc.peers_rwnd, 5770 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5771 stcb->asoc.total_flight); 5772 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5773 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5774 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5775 } 5776 if (cnt_ctrl_ready || 5777 ((un_sent) && 5778 (stcb->asoc.peers_rwnd > 0 || 5779 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5780 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5781 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5782 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5783 } 5784 #ifdef SCTP_AUDITING_ENABLED 5785 sctp_audit_log(0xE0, 3); 5786 sctp_auditing(2, inp, stcb, net); 5787 #endif 5788 SCTP_TCB_UNLOCK(stcb); 5789 out_now: 5790 #ifdef INVARIANTS 5791 sctp_validate_no_locks(inp); 5792 #endif 5793 return; 5794 } 5795 5796 #if 0 5797 static void 5798 sctp_print_mbuf_chain(struct mbuf *m) 5799 { 5800 for (; m; m = SCTP_BUF_NEXT(m)) { 5801 SCTP_PRINTF("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5802 if (SCTP_BUF_IS_EXTENDED(m)) 5803 SCTP_PRINTF("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5804 } 5805 } 5806 5807 #endif 5808 5809 #ifdef INET 5810 void 5811 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5812 { 5813 struct mbuf *m; 5814 int iphlen; 5815 uint32_t vrf_id = 0; 5816 uint8_t ecn_bits; 5817 struct ip *ip; 5818 struct sctphdr *sh; 5819 struct sctp_inpcb *inp = NULL; 5820 struct sctp_nets *net; 5821 struct sctp_tcb *stcb = NULL; 5822 struct sctp_chunkhdr *ch; 5823 int refcount_up = 0; 5824 int length, mlen, offset; 5825 5826 #if !defined(SCTP_WITH_NO_CSUM) 5827 uint32_t check, calc_check; 5828 5829 #endif 5830 5831 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5832 SCTP_RELEASE_PKT(i_pak); 5833 return; 5834 } 5835 mlen = SCTP_HEADER_LEN(i_pak); 5836 iphlen = off; 5837 m = SCTP_HEADER_TO_CHAIN(i_pak); 5838 5839 net = NULL; 5840 SCTP_STAT_INCR(sctps_recvpackets); 5841 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5842 5843 5844 #ifdef SCTP_MBUF_LOGGING 5845 /* Log in any input mbufs */ 5846 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5847 struct mbuf *mat; 5848 5849 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5850 if (SCTP_BUF_IS_EXTENDED(mat)) { 5851 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5852 } 5853 } 5854 } 5855 #endif 5856 #ifdef SCTP_PACKET_LOGGING 5857 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5858 sctp_packet_log(m, mlen); 5859 #endif 5860 /* 5861 * Must take out the iphlen, since mlen expects this (only effect lb 5862 * case) 5863 */ 5864 mlen -= iphlen; 5865 5866 /* 5867 * Get IP, SCTP, and first chunk header together in first mbuf. 5868 */ 5869 ip = mtod(m, struct ip *); 5870 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5871 if (SCTP_BUF_LEN(m) < offset) { 5872 if ((m = m_pullup(m, offset)) == 0) { 5873 SCTP_STAT_INCR(sctps_hdrops); 5874 return; 5875 } 5876 ip = mtod(m, struct ip *); 5877 } 5878 /* validate mbuf chain length with IP payload length */ 5879 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5880 SCTP_STAT_INCR(sctps_hdrops); 5881 goto bad; 5882 } 5883 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5884 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5885 SCTPDBG(SCTP_DEBUG_INPUT1, 5886 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5887 5888 /* SCTP does not allow broadcasts or multicasts */ 5889 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5890 goto bad; 5891 } 5892 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5893 /* 5894 * We only look at broadcast if its a front state, All 5895 * others we will not have a tcb for anyway. 5896 */ 5897 goto bad; 5898 } 5899 /* validate SCTP checksum */ 5900 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5901 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5902 m->m_pkthdr.len, 5903 if_name(m->m_pkthdr.rcvif), 5904 m->m_pkthdr.csum_flags); 5905 #if defined(SCTP_WITH_NO_CSUM) 5906 SCTP_STAT_INCR(sctps_recvnocrc); 5907 #else 5908 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5909 SCTP_STAT_INCR(sctps_recvhwcrc); 5910 goto sctp_skip_csum_4; 5911 } 5912 check = sh->checksum; /* save incoming checksum */ 5913 sh->checksum = 0; /* prepare for calc */ 5914 calc_check = sctp_calculate_cksum(m, iphlen); 5915 sh->checksum = check; 5916 SCTP_STAT_INCR(sctps_recvswcrc); 5917 if (calc_check != check) { 5918 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5919 calc_check, check, m, mlen, iphlen); 5920 5921 stcb = sctp_findassociation_addr(m, 5922 offset - sizeof(*ch), 5923 sh, ch, &inp, &net, 5924 vrf_id); 5925 if ((net) && (port)) { 5926 if (net->port == 0) { 5927 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5928 } 5929 net->port = port; 5930 } 5931 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5932 net->flowid = m->m_pkthdr.flowid; 5933 #ifdef INVARIANTS 5934 net->flowidset = 1; 5935 #endif 5936 } 5937 if ((inp) && (stcb)) { 5938 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5939 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5940 } else if ((inp != NULL) && (stcb == NULL)) { 5941 refcount_up = 1; 5942 } 5943 SCTP_STAT_INCR(sctps_badsum); 5944 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5945 goto bad; 5946 } 5947 sctp_skip_csum_4: 5948 #endif 5949 /* destination port of 0 is illegal, based on RFC2960. */ 5950 if (sh->dest_port == 0) { 5951 SCTP_STAT_INCR(sctps_hdrops); 5952 goto bad; 5953 } 5954 /* 5955 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5956 * IP/SCTP/first chunk header... 5957 */ 5958 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5959 sh, ch, &inp, &net, vrf_id); 5960 if ((net) && (port)) { 5961 if (net->port == 0) { 5962 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5963 } 5964 net->port = port; 5965 } 5966 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5967 net->flowid = m->m_pkthdr.flowid; 5968 #ifdef INVARIANTS 5969 net->flowidset = 1; 5970 #endif 5971 } 5972 /* inp's ref-count increased && stcb locked */ 5973 if (inp == NULL) { 5974 struct sctp_init_chunk *init_chk, chunk_buf; 5975 5976 SCTP_STAT_INCR(sctps_noport); 5977 #ifdef ICMP_BANDLIM 5978 /* 5979 * we use the bandwidth limiting to protect against sending 5980 * too many ABORTS all at once. In this case these count the 5981 * same as an ICMP message. 5982 */ 5983 if (badport_bandlim(0) < 0) 5984 goto bad; 5985 #endif /* ICMP_BANDLIM */ 5986 SCTPDBG(SCTP_DEBUG_INPUT1, 5987 "Sending a ABORT from packet entry!\n"); 5988 if (ch->chunk_type == SCTP_INITIATION) { 5989 /* 5990 * we do a trick here to get the INIT tag, dig in 5991 * and get the tag from the INIT and put it in the 5992 * common header. 5993 */ 5994 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5995 iphlen + sizeof(*sh), sizeof(*init_chk), 5996 (uint8_t *) & chunk_buf); 5997 if (init_chk != NULL) 5998 sh->v_tag = init_chk->init.initiate_tag; 5999 } 6000 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 6001 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 6002 goto bad; 6003 } 6004 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 6005 goto bad; 6006 } 6007 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6008 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6009 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6010 (ch->chunk_type != SCTP_INIT))) { 6011 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 6012 } 6013 } 6014 goto bad; 6015 } else if (stcb == NULL) { 6016 refcount_up = 1; 6017 } 6018 #ifdef IPSEC 6019 /* 6020 * I very much doubt any of the IPSEC stuff will work but I have no 6021 * idea, so I will leave it in place. 6022 */ 6023 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6024 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6025 SCTP_STAT_INCR(sctps_hdrops); 6026 goto bad; 6027 } 6028 #endif /* IPSEC */ 6029 6030 /* 6031 * common chunk processing 6032 */ 6033 length = ip->ip_len + iphlen; 6034 offset -= sizeof(struct sctp_chunkhdr); 6035 6036 ecn_bits = ip->ip_tos; 6037 6038 /* sa_ignore NO_NULL_CHK */ 6039 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 6040 inp, stcb, net, ecn_bits, vrf_id, port); 6041 /* inp's ref-count reduced && stcb unlocked */ 6042 if (m) { 6043 sctp_m_freem(m); 6044 } 6045 if ((inp) && (refcount_up)) { 6046 /* reduce ref-count */ 6047 SCTP_INP_DECR_REF(inp); 6048 } 6049 return; 6050 bad: 6051 if (stcb) { 6052 SCTP_TCB_UNLOCK(stcb); 6053 } 6054 if ((inp) && (refcount_up)) { 6055 /* reduce ref-count */ 6056 SCTP_INP_DECR_REF(inp); 6057 } 6058 if (m) { 6059 sctp_m_freem(m); 6060 } 6061 return; 6062 } 6063 6064 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6065 extern int *sctp_cpuarry; 6066 6067 #endif 6068 6069 void 6070 sctp_input(struct mbuf *m, int off) 6071 { 6072 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6073 struct ip *ip; 6074 struct sctphdr *sh; 6075 int offset; 6076 int cpu_to_use; 6077 uint32_t flowid, tag; 6078 6079 if (mp_ncpus > 1) { 6080 if (m->m_flags & M_FLOWID) { 6081 flowid = m->m_pkthdr.flowid; 6082 } else { 6083 /* 6084 * No flow id built by lower layers fix it so we 6085 * create one. 6086 */ 6087 ip = mtod(m, struct ip *); 6088 offset = off + sizeof(*sh); 6089 if (SCTP_BUF_LEN(m) < offset) { 6090 if ((m = m_pullup(m, offset)) == 0) { 6091 SCTP_STAT_INCR(sctps_hdrops); 6092 return; 6093 } 6094 ip = mtod(m, struct ip *); 6095 } 6096 sh = (struct sctphdr *)((caddr_t)ip + off); 6097 tag = htonl(sh->v_tag); 6098 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6099 m->m_pkthdr.flowid = flowid; 6100 m->m_flags |= M_FLOWID; 6101 } 6102 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6103 sctp_queue_to_mcore(m, off, cpu_to_use); 6104 return; 6105 } 6106 #endif 6107 sctp_input_with_port(m, off, 0); 6108 } 6109 6110 #endif 6111