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