1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/udp.h> 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88 { 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 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 { 263 struct sctp_init *init; 264 struct sctp_association *asoc; 265 struct sctp_nets *lnet; 266 unsigned int i; 267 268 init = &cp->init; 269 asoc = &stcb->asoc; 270 /* save off parameters */ 271 asoc->peer_vtag = ntohl(init->initiate_tag); 272 asoc->peers_rwnd = ntohl(init->a_rwnd); 273 /* init tsn's */ 274 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 275 276 if (!TAILQ_EMPTY(&asoc->nets)) { 277 /* update any ssthresh's that may have a default */ 278 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 279 lnet->ssthresh = asoc->peers_rwnd; 280 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 281 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 282 } 283 } 284 } 285 SCTP_TCB_SEND_LOCK(stcb); 286 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 287 unsigned int newcnt; 288 struct sctp_stream_out *outs; 289 struct sctp_stream_queue_pending *sp, *nsp; 290 struct sctp_tmit_chunk *chk, *nchk; 291 292 /* abandon the upper streams */ 293 newcnt = ntohs(init->num_inbound_streams); 294 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 295 if (chk->rec.data.stream_number >= newcnt) { 296 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 297 asoc->send_queue_cnt--; 298 if (chk->data != NULL) { 299 sctp_free_bufspace(stcb, asoc, chk, 1); 300 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 301 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 302 if (chk->data) { 303 sctp_m_freem(chk->data); 304 chk->data = NULL; 305 } 306 } 307 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 308 /* sa_ignore FREED_MEMORY */ 309 } 310 } 311 if (asoc->strmout) { 312 for (i = newcnt; i < asoc->pre_open_streams; i++) { 313 outs = &asoc->strmout[i]; 314 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 315 TAILQ_REMOVE(&outs->outqueue, sp, next); 316 asoc->stream_queue_cnt--; 317 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 318 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 319 sp, SCTP_SO_NOT_LOCKED); 320 if (sp->data) { 321 sctp_m_freem(sp->data); 322 sp->data = NULL; 323 } 324 if (sp->net) { 325 sctp_free_remote_addr(sp->net); 326 sp->net = NULL; 327 } 328 /* Free the chunk */ 329 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 330 /* sa_ignore FREED_MEMORY */ 331 } 332 } 333 } 334 /* cut back the count */ 335 asoc->pre_open_streams = newcnt; 336 } 337 SCTP_TCB_SEND_UNLOCK(stcb); 338 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 339 340 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 341 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 342 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 343 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 344 } 345 /* This is the next one we expect */ 346 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 347 348 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 349 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 350 351 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 352 /* open the requested streams */ 353 354 if (asoc->strmin != NULL) { 355 /* Free the old ones */ 356 struct sctp_queued_to_read *ctl, *nctl; 357 358 for (i = 0; i < asoc->streamincnt; i++) { 359 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 360 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 361 sctp_free_remote_addr(ctl->whoFrom); 362 ctl->whoFrom = NULL; 363 sctp_m_freem(ctl->data); 364 ctl->data = NULL; 365 sctp_free_a_readq(stcb, ctl); 366 } 367 } 368 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 369 } 370 asoc->streamincnt = ntohs(init->num_outbound_streams); 371 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 372 asoc->streamincnt = MAX_SCTP_STREAMS; 373 } 374 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 375 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 376 if (asoc->strmin == NULL) { 377 /* we didn't get memory for the streams! */ 378 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 379 return (-1); 380 } 381 for (i = 0; i < asoc->streamincnt; i++) { 382 asoc->strmin[i].stream_no = i; 383 asoc->strmin[i].last_sequence_delivered = 0xffff; 384 /* 385 * U-stream ranges will be set when the cookie is unpacked. 386 * Or for the INIT sender they are un set (if pr-sctp not 387 * supported) when the INIT-ACK arrives. 388 */ 389 TAILQ_INIT(&asoc->strmin[i].inqueue); 390 asoc->strmin[i].delivery_started = 0; 391 } 392 /* 393 * load_address_from_init will put the addresses into the 394 * association when the COOKIE is processed or the INIT-ACK is 395 * processed. Both types of COOKIE's existing and new call this 396 * routine. It will remove addresses that are no longer in the 397 * association (for the restarting case where addresses are 398 * removed). Up front when the INIT arrives we will discard it if it 399 * is a restart and new addresses have been added. 400 */ 401 /* sa_ignore MEMLEAK */ 402 return (0); 403 } 404 405 /* 406 * INIT-ACK message processing/consumption returns value < 0 on error 407 */ 408 static int 409 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 410 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 411 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 412 { 413 struct sctp_association *asoc; 414 struct mbuf *op_err; 415 int retval, abort_flag; 416 uint32_t initack_limit; 417 int nat_friendly = 0; 418 419 /* First verify that we have no illegal param's */ 420 abort_flag = 0; 421 op_err = NULL; 422 423 op_err = sctp_arethere_unrecognized_parameters(m, 424 (offset + sizeof(struct sctp_init_chunk)), 425 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 426 if (abort_flag) { 427 /* Send an abort and notify peer */ 428 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 429 *abort_no_unlock = 1; 430 return (-1); 431 } 432 asoc = &stcb->asoc; 433 asoc->peer_supports_nat = (uint8_t) nat_friendly; 434 /* process the peer's parameters in the INIT-ACK */ 435 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 436 if (retval < 0) { 437 return (retval); 438 } 439 initack_limit = offset + ntohs(cp->ch.chunk_length); 440 /* load all addresses */ 441 if ((retval = sctp_load_addresses_from_init(stcb, m, 442 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 443 NULL))) { 444 /* Huh, we should abort */ 445 SCTPDBG(SCTP_DEBUG_INPUT1, 446 "Load addresses from INIT causes an abort %d\n", 447 retval); 448 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 449 NULL, 0, net->port); 450 *abort_no_unlock = 1; 451 return (-1); 452 } 453 /* if the peer doesn't support asconf, flush the asconf queue */ 454 if (asoc->peer_supports_asconf == 0) { 455 struct sctp_asconf_addr *param, *nparam; 456 457 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 458 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 459 SCTP_FREE(param, SCTP_M_ASC_ADDR); 460 } 461 } 462 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 463 stcb->asoc.local_hmacs); 464 if (op_err) { 465 sctp_queue_op_err(stcb, op_err); 466 /* queuing will steal away the mbuf chain to the out queue */ 467 op_err = NULL; 468 } 469 /* extract the cookie and queue it to "echo" it back... */ 470 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 471 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 472 stcb->asoc.overall_error_count, 473 0, 474 SCTP_FROM_SCTP_INPUT, 475 __LINE__); 476 } 477 stcb->asoc.overall_error_count = 0; 478 net->error_count = 0; 479 480 /* 481 * Cancel the INIT timer, We do this first before queueing the 482 * cookie. We always cancel at the primary to assue that we are 483 * canceling the timer started by the INIT which always goes to the 484 * primary. 485 */ 486 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 487 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 488 489 /* calculate the RTO */ 490 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 491 SCTP_RTT_FROM_NON_DATA); 492 493 retval = sctp_send_cookie_echo(m, offset, stcb, net); 494 if (retval < 0) { 495 /* 496 * No cookie, we probably should send a op error. But in any 497 * case if there is no cookie in the INIT-ACK, we can 498 * abandon the peer, its broke. 499 */ 500 if (retval == -3) { 501 /* We abort with an error of missing mandatory param */ 502 op_err = 503 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 504 if (op_err) { 505 /* 506 * Expand beyond to include the mandatory 507 * param cookie 508 */ 509 struct sctp_inv_mandatory_param *mp; 510 511 SCTP_BUF_LEN(op_err) = 512 sizeof(struct sctp_inv_mandatory_param); 513 mp = mtod(op_err, 514 struct sctp_inv_mandatory_param *); 515 /* Subtract the reserved param */ 516 mp->length = 517 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 518 mp->num_param = htonl(1); 519 mp->param = htons(SCTP_STATE_COOKIE); 520 mp->resv = 0; 521 } 522 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 523 sh, op_err, vrf_id, net->port); 524 *abort_no_unlock = 1; 525 } 526 return (retval); 527 } 528 return (0); 529 } 530 531 static void 532 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 533 struct sctp_tcb *stcb, struct sctp_nets *net) 534 { 535 struct sockaddr_storage store; 536 struct sctp_nets *r_net, *f_net; 537 struct timeval tv; 538 int req_prim = 0; 539 uint16_t old_error_counter; 540 541 #ifdef INET 542 struct sockaddr_in *sin; 543 544 #endif 545 #ifdef INET6 546 struct sockaddr_in6 *sin6; 547 548 #endif 549 550 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 551 /* Invalid length */ 552 return; 553 } 554 memset(&store, 0, sizeof(store)); 555 switch (cp->heartbeat.hb_info.addr_family) { 556 #ifdef INET 557 case AF_INET: 558 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 559 sin = (struct sockaddr_in *)&store; 560 sin->sin_family = cp->heartbeat.hb_info.addr_family; 561 sin->sin_len = cp->heartbeat.hb_info.addr_len; 562 sin->sin_port = stcb->rport; 563 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 564 sizeof(sin->sin_addr)); 565 } else { 566 return; 567 } 568 break; 569 #endif 570 #ifdef INET6 571 case AF_INET6: 572 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 573 sin6 = (struct sockaddr_in6 *)&store; 574 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 575 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 576 sin6->sin6_port = stcb->rport; 577 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 578 sizeof(sin6->sin6_addr)); 579 } else { 580 return; 581 } 582 break; 583 #endif 584 default: 585 return; 586 } 587 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 588 if (r_net == NULL) { 589 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 590 return; 591 } 592 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 593 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 594 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 595 /* 596 * If the its a HB and it's random value is correct when can 597 * confirm the destination. 598 */ 599 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 600 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 601 stcb->asoc.primary_destination = r_net; 602 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 603 f_net = TAILQ_FIRST(&stcb->asoc.nets); 604 if (f_net != r_net) { 605 /* 606 * first one on the list is NOT the primary 607 * sctp_cmpaddr() is much more efficent if 608 * the primary is the first on the list, 609 * make it so. 610 */ 611 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 612 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 613 } 614 req_prim = 1; 615 } 616 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 617 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 618 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 619 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 620 } 621 old_error_counter = r_net->error_count; 622 r_net->error_count = 0; 623 r_net->hb_responded = 1; 624 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 625 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 626 /* Now lets do a RTO with this */ 627 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 628 SCTP_RTT_FROM_NON_DATA); 629 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 630 r_net->dest_state |= SCTP_ADDR_REACHABLE; 631 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 632 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 633 } 634 if (r_net->dest_state & SCTP_ADDR_PF) { 635 r_net->dest_state &= ~SCTP_ADDR_PF; 636 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 637 } 638 if (old_error_counter > 0) { 639 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 640 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 641 } 642 if (r_net == stcb->asoc.primary_destination) { 643 if (stcb->asoc.alternate) { 644 /* release the alternate, primary is good */ 645 sctp_free_remote_addr(stcb->asoc.alternate); 646 stcb->asoc.alternate = NULL; 647 } 648 } 649 /* Mobility adaptation */ 650 if (req_prim) { 651 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE) || 653 sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_FASTHANDOFF)) && 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_PRIM_DELETED)) { 657 658 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 659 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 660 SCTP_MOBILITY_FASTHANDOFF)) { 661 sctp_assoc_immediate_retrans(stcb, 662 stcb->asoc.primary_destination); 663 } 664 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 665 SCTP_MOBILITY_BASE)) { 666 sctp_move_chunks_from_net(stcb, 667 stcb->asoc.deleted_primary); 668 } 669 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 670 stcb->asoc.deleted_primary); 671 } 672 } 673 } 674 675 static int 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 677 { 678 /* 679 * return 0 means we want you to proceed with the abort non-zero 680 * means no abort processing 681 */ 682 struct sctpasochead *head; 683 684 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 685 /* generate a new vtag and send init */ 686 LIST_REMOVE(stcb, sctp_asocs); 687 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 688 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 689 /* 690 * put it in the bucket in the vtag hash of assoc's for the 691 * system 692 */ 693 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 694 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 695 return (1); 696 } 697 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 698 /* 699 * treat like a case where the cookie expired i.e.: - dump 700 * current cookie. - generate a new vtag. - resend init. 701 */ 702 /* generate a new vtag and send init */ 703 LIST_REMOVE(stcb, sctp_asocs); 704 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 705 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 706 sctp_stop_all_cookie_timers(stcb); 707 sctp_toss_old_cookies(stcb, &stcb->asoc); 708 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 709 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 710 /* 711 * put it in the bucket in the vtag hash of assoc's for the 712 * system 713 */ 714 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 715 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 716 return (1); 717 } 718 return (0); 719 } 720 721 static int 722 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 723 struct sctp_nets *net) 724 { 725 /* 726 * return 0 means we want you to proceed with the abort non-zero 727 * means no abort processing 728 */ 729 if (stcb->asoc.peer_supports_auth == 0) { 730 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 731 return (0); 732 } 733 sctp_asconf_send_nat_state_update(stcb, net); 734 return (1); 735 } 736 737 738 static void 739 sctp_handle_abort(struct sctp_abort_chunk *cp, 740 struct sctp_tcb *stcb, struct sctp_nets *net) 741 { 742 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 743 struct socket *so; 744 745 #endif 746 uint16_t len; 747 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 749 if (stcb == NULL) 750 return; 751 752 len = ntohs(cp->ch.chunk_length); 753 if (len > sizeof(struct sctp_chunkhdr)) { 754 /* 755 * Need to check the cause codes for our two magic nat 756 * aborts which don't kill the assoc necessarily. 757 */ 758 struct sctp_abort_chunk *cpnext; 759 struct sctp_missing_nat_state *natc; 760 uint16_t cause; 761 762 cpnext = cp; 763 cpnext++; 764 natc = (struct sctp_missing_nat_state *)cpnext; 765 cause = ntohs(natc->cause); 766 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 767 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 768 cp->ch.chunk_flags); 769 if (sctp_handle_nat_colliding_state(stcb)) { 770 return; 771 } 772 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 773 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 774 cp->ch.chunk_flags); 775 if (sctp_handle_nat_missing_state(stcb, net)) { 776 return; 777 } 778 } 779 } 780 /* stop any receive timers */ 781 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 782 /* notify user of the abort and clean up... */ 783 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 784 /* free the tcb */ 785 #if defined(SCTP_PANIC_ON_ABORT) 786 printf("stcb:%p state:%d rport:%d net:%p\n", 787 stcb, stcb->asoc.state, stcb->rport, net); 788 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 789 panic("Received an ABORT"); 790 } else { 791 printf("No panic its in state %x closed\n", stcb->asoc.state); 792 } 793 #endif 794 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 795 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 796 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 797 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 798 } 799 #ifdef SCTP_ASOCLOG_OF_TSNS 800 sctp_print_out_track_log(stcb); 801 #endif 802 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 803 so = SCTP_INP_SO(stcb->sctp_ep); 804 atomic_add_int(&stcb->asoc.refcnt, 1); 805 SCTP_TCB_UNLOCK(stcb); 806 SCTP_SOCKET_LOCK(so, 1); 807 SCTP_TCB_LOCK(stcb); 808 atomic_subtract_int(&stcb->asoc.refcnt, 1); 809 #endif 810 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 811 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 812 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 813 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 814 SCTP_SOCKET_UNLOCK(so, 1); 815 #endif 816 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 817 } 818 819 static void 820 sctp_start_net_timers(struct sctp_tcb *stcb) 821 { 822 uint32_t cnt_hb_sent; 823 struct sctp_nets *net; 824 825 cnt_hb_sent = 0; 826 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 827 /* 828 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 829 * If the dest in unconfirmed send a hb as well if under 830 * max_hb_burst have been sent. 831 */ 832 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 833 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 834 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 835 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 836 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 837 cnt_hb_sent++; 838 } 839 } 840 if (cnt_hb_sent) { 841 sctp_chunk_output(stcb->sctp_ep, stcb, 842 SCTP_OUTPUT_FROM_COOKIE_ACK, 843 SCTP_SO_NOT_LOCKED); 844 } 845 } 846 847 848 static void 849 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 850 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 851 { 852 struct sctp_association *asoc; 853 int some_on_streamwheel; 854 855 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 856 struct socket *so; 857 858 #endif 859 860 SCTPDBG(SCTP_DEBUG_INPUT2, 861 "sctp_handle_shutdown: handling SHUTDOWN\n"); 862 if (stcb == NULL) 863 return; 864 asoc = &stcb->asoc; 865 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 866 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 867 return; 868 } 869 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 870 /* Shutdown NOT the expected size */ 871 return; 872 } else { 873 sctp_update_acked(stcb, cp, abort_flag); 874 if (*abort_flag) { 875 return; 876 } 877 } 878 if (asoc->control_pdapi) { 879 /* 880 * With a normal shutdown we assume the end of last record. 881 */ 882 SCTP_INP_READ_LOCK(stcb->sctp_ep); 883 asoc->control_pdapi->end_added = 1; 884 asoc->control_pdapi->pdapi_aborted = 1; 885 asoc->control_pdapi = NULL; 886 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 887 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 888 so = SCTP_INP_SO(stcb->sctp_ep); 889 atomic_add_int(&stcb->asoc.refcnt, 1); 890 SCTP_TCB_UNLOCK(stcb); 891 SCTP_SOCKET_LOCK(so, 1); 892 SCTP_TCB_LOCK(stcb); 893 atomic_subtract_int(&stcb->asoc.refcnt, 1); 894 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 895 /* assoc was freed while we were unlocked */ 896 SCTP_SOCKET_UNLOCK(so, 1); 897 return; 898 } 899 #endif 900 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 901 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 902 SCTP_SOCKET_UNLOCK(so, 1); 903 #endif 904 } 905 /* goto SHUTDOWN_RECEIVED state to block new requests */ 906 if (stcb->sctp_socket) { 907 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 908 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 909 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 910 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 911 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 912 /* 913 * notify upper layer that peer has initiated a 914 * shutdown 915 */ 916 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 917 918 /* reset time */ 919 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 920 } 921 } 922 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 923 /* 924 * stop the shutdown timer, since we WILL move to 925 * SHUTDOWN-ACK-SENT. 926 */ 927 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 928 } 929 /* Now is there unsent data on a stream somewhere? */ 930 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 931 932 if (!TAILQ_EMPTY(&asoc->send_queue) || 933 !TAILQ_EMPTY(&asoc->sent_queue) || 934 some_on_streamwheel) { 935 /* By returning we will push more data out */ 936 return; 937 } else { 938 /* no outstanding data to send, so move on... */ 939 /* send SHUTDOWN-ACK */ 940 sctp_send_shutdown_ack(stcb, net); 941 /* move to SHUTDOWN-ACK-SENT state */ 942 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 943 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 944 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 945 } 946 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 947 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 948 sctp_stop_timers_for_shutdown(stcb); 949 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 950 stcb, net); 951 } 952 } 953 954 static void 955 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 956 struct sctp_tcb *stcb, 957 struct sctp_nets *net) 958 { 959 struct sctp_association *asoc; 960 961 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 962 struct socket *so; 963 964 so = SCTP_INP_SO(stcb->sctp_ep); 965 #endif 966 SCTPDBG(SCTP_DEBUG_INPUT2, 967 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 968 if (stcb == NULL) 969 return; 970 971 asoc = &stcb->asoc; 972 /* process according to association state */ 973 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 974 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 975 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 976 sctp_send_shutdown_complete(stcb, net, 1); 977 SCTP_TCB_UNLOCK(stcb); 978 return; 979 } 980 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 981 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 982 /* unexpected SHUTDOWN-ACK... so ignore... */ 983 SCTP_TCB_UNLOCK(stcb); 984 return; 985 } 986 if (asoc->control_pdapi) { 987 /* 988 * With a normal shutdown we assume the end of last record. 989 */ 990 SCTP_INP_READ_LOCK(stcb->sctp_ep); 991 asoc->control_pdapi->end_added = 1; 992 asoc->control_pdapi->pdapi_aborted = 1; 993 asoc->control_pdapi = NULL; 994 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 995 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 996 atomic_add_int(&stcb->asoc.refcnt, 1); 997 SCTP_TCB_UNLOCK(stcb); 998 SCTP_SOCKET_LOCK(so, 1); 999 SCTP_TCB_LOCK(stcb); 1000 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1001 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1002 /* assoc was freed while we were unlocked */ 1003 SCTP_SOCKET_UNLOCK(so, 1); 1004 return; 1005 } 1006 #endif 1007 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1008 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1009 SCTP_SOCKET_UNLOCK(so, 1); 1010 #endif 1011 } 1012 /* are the queues empty? */ 1013 if (!TAILQ_EMPTY(&asoc->send_queue) || 1014 !TAILQ_EMPTY(&asoc->sent_queue) || 1015 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1016 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 1017 } 1018 /* stop the timer */ 1019 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1020 /* send SHUTDOWN-COMPLETE */ 1021 sctp_send_shutdown_complete(stcb, net, 0); 1022 /* notify upper layer protocol */ 1023 if (stcb->sctp_socket) { 1024 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1025 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1026 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1027 /* Set the connected flag to disconnected */ 1028 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 1029 } 1030 } 1031 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1032 /* free the TCB but first save off the ep */ 1033 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1034 atomic_add_int(&stcb->asoc.refcnt, 1); 1035 SCTP_TCB_UNLOCK(stcb); 1036 SCTP_SOCKET_LOCK(so, 1); 1037 SCTP_TCB_LOCK(stcb); 1038 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1039 #endif 1040 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1041 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1042 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1043 SCTP_SOCKET_UNLOCK(so, 1); 1044 #endif 1045 } 1046 1047 /* 1048 * Skip past the param header and then we will find the chunk that caused the 1049 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1050 * our peer must be broken. 1051 */ 1052 static void 1053 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1054 struct sctp_nets *net) 1055 { 1056 struct sctp_chunkhdr *chk; 1057 1058 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1059 switch (chk->chunk_type) { 1060 case SCTP_ASCONF_ACK: 1061 case SCTP_ASCONF: 1062 sctp_asconf_cleanup(stcb, net); 1063 break; 1064 case SCTP_FORWARD_CUM_TSN: 1065 stcb->asoc.peer_supports_prsctp = 0; 1066 break; 1067 default: 1068 SCTPDBG(SCTP_DEBUG_INPUT2, 1069 "Peer does not support chunk type %d(%x)??\n", 1070 chk->chunk_type, (uint32_t) chk->chunk_type); 1071 break; 1072 } 1073 } 1074 1075 /* 1076 * Skip past the param header and then we will find the param that caused the 1077 * problem. There are a number of param's in a ASCONF OR the prsctp param 1078 * these will turn of specific features. 1079 */ 1080 static void 1081 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1082 { 1083 struct sctp_paramhdr *pbad; 1084 1085 pbad = phdr + 1; 1086 switch (ntohs(pbad->param_type)) { 1087 /* pr-sctp draft */ 1088 case SCTP_PRSCTP_SUPPORTED: 1089 stcb->asoc.peer_supports_prsctp = 0; 1090 break; 1091 case SCTP_SUPPORTED_CHUNK_EXT: 1092 break; 1093 /* draft-ietf-tsvwg-addip-sctp */ 1094 case SCTP_HAS_NAT_SUPPORT: 1095 stcb->asoc.peer_supports_nat = 0; 1096 break; 1097 case SCTP_ADD_IP_ADDRESS: 1098 case SCTP_DEL_IP_ADDRESS: 1099 case SCTP_SET_PRIM_ADDR: 1100 stcb->asoc.peer_supports_asconf = 0; 1101 break; 1102 case SCTP_SUCCESS_REPORT: 1103 case SCTP_ERROR_CAUSE_IND: 1104 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1105 SCTPDBG(SCTP_DEBUG_INPUT2, 1106 "Turning off ASCONF to this strange peer\n"); 1107 stcb->asoc.peer_supports_asconf = 0; 1108 break; 1109 default: 1110 SCTPDBG(SCTP_DEBUG_INPUT2, 1111 "Peer does not support param type %d(%x)??\n", 1112 pbad->param_type, (uint32_t) pbad->param_type); 1113 break; 1114 } 1115 } 1116 1117 static int 1118 sctp_handle_error(struct sctp_chunkhdr *ch, 1119 struct sctp_tcb *stcb, struct sctp_nets *net) 1120 { 1121 int chklen; 1122 struct sctp_paramhdr *phdr; 1123 uint16_t error_type; 1124 uint16_t error_len; 1125 struct sctp_association *asoc; 1126 int adjust; 1127 1128 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1129 struct socket *so; 1130 1131 #endif 1132 1133 /* parse through all of the errors and process */ 1134 asoc = &stcb->asoc; 1135 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1136 sizeof(struct sctp_chunkhdr)); 1137 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1138 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1139 /* Process an Error Cause */ 1140 error_type = ntohs(phdr->param_type); 1141 error_len = ntohs(phdr->param_length); 1142 if ((error_len > chklen) || (error_len == 0)) { 1143 /* invalid param length for this param */ 1144 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1145 chklen, error_len); 1146 return (0); 1147 } 1148 switch (error_type) { 1149 case SCTP_CAUSE_INVALID_STREAM: 1150 case SCTP_CAUSE_MISSING_PARAM: 1151 case SCTP_CAUSE_INVALID_PARAM: 1152 case SCTP_CAUSE_NO_USER_DATA: 1153 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1154 error_type); 1155 break; 1156 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1157 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1158 ch->chunk_flags); 1159 if (sctp_handle_nat_colliding_state(stcb)) { 1160 return (0); 1161 } 1162 break; 1163 case SCTP_CAUSE_NAT_MISSING_STATE: 1164 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1165 ch->chunk_flags); 1166 if (sctp_handle_nat_missing_state(stcb, net)) { 1167 return (0); 1168 } 1169 break; 1170 case SCTP_CAUSE_STALE_COOKIE: 1171 /* 1172 * We only act if we have echoed a cookie and are 1173 * waiting. 1174 */ 1175 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1176 int *p; 1177 1178 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1179 /* Save the time doubled */ 1180 asoc->cookie_preserve_req = ntohl(*p) << 1; 1181 asoc->stale_cookie_count++; 1182 if (asoc->stale_cookie_count > 1183 asoc->max_init_times) { 1184 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1185 /* now free the asoc */ 1186 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1187 so = SCTP_INP_SO(stcb->sctp_ep); 1188 atomic_add_int(&stcb->asoc.refcnt, 1); 1189 SCTP_TCB_UNLOCK(stcb); 1190 SCTP_SOCKET_LOCK(so, 1); 1191 SCTP_TCB_LOCK(stcb); 1192 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1193 #endif 1194 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1195 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1196 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1197 SCTP_SOCKET_UNLOCK(so, 1); 1198 #endif 1199 return (-1); 1200 } 1201 /* blast back to INIT state */ 1202 sctp_toss_old_cookies(stcb, &stcb->asoc); 1203 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1204 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1205 sctp_stop_all_cookie_timers(stcb); 1206 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1207 } 1208 break; 1209 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1210 /* 1211 * Nothing we can do here, we don't do hostname 1212 * addresses so if the peer does not like my IPv6 1213 * (or IPv4 for that matter) it does not matter. If 1214 * they don't support that type of address, they can 1215 * NOT possibly get that packet type... i.e. with no 1216 * IPv6 you can't recieve a IPv6 packet. so we can 1217 * safely ignore this one. If we ever added support 1218 * for HOSTNAME Addresses, then we would need to do 1219 * something here. 1220 */ 1221 break; 1222 case SCTP_CAUSE_UNRECOG_CHUNK: 1223 sctp_process_unrecog_chunk(stcb, phdr, net); 1224 break; 1225 case SCTP_CAUSE_UNRECOG_PARAM: 1226 sctp_process_unrecog_param(stcb, phdr); 1227 break; 1228 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1229 /* 1230 * We ignore this since the timer will drive out a 1231 * new cookie anyway and there timer will drive us 1232 * to send a SHUTDOWN_COMPLETE. We can't send one 1233 * here since we don't have their tag. 1234 */ 1235 break; 1236 case SCTP_CAUSE_DELETING_LAST_ADDR: 1237 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1238 case SCTP_CAUSE_DELETING_SRC_ADDR: 1239 /* 1240 * We should NOT get these here, but in a 1241 * ASCONF-ACK. 1242 */ 1243 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1244 error_type); 1245 break; 1246 case SCTP_CAUSE_OUT_OF_RESC: 1247 /* 1248 * And what, pray tell do we do with the fact that 1249 * the peer is out of resources? Not really sure we 1250 * could do anything but abort. I suspect this 1251 * should have came WITH an abort instead of in a 1252 * OP-ERROR. 1253 */ 1254 break; 1255 default: 1256 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1257 error_type); 1258 break; 1259 } 1260 adjust = SCTP_SIZE32(error_len); 1261 chklen -= adjust; 1262 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1263 } 1264 return (0); 1265 } 1266 1267 static int 1268 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1269 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1270 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1271 { 1272 struct sctp_init_ack *init_ack; 1273 struct mbuf *op_err; 1274 1275 SCTPDBG(SCTP_DEBUG_INPUT2, 1276 "sctp_handle_init_ack: handling INIT-ACK\n"); 1277 1278 if (stcb == NULL) { 1279 SCTPDBG(SCTP_DEBUG_INPUT2, 1280 "sctp_handle_init_ack: TCB is null\n"); 1281 return (-1); 1282 } 1283 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1284 /* Invalid length */ 1285 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1286 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1287 op_err, 0, net->port); 1288 *abort_no_unlock = 1; 1289 return (-1); 1290 } 1291 init_ack = &cp->init; 1292 /* validate parameters */ 1293 if (init_ack->initiate_tag == 0) { 1294 /* protocol error... send an abort */ 1295 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1296 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1297 op_err, 0, net->port); 1298 *abort_no_unlock = 1; 1299 return (-1); 1300 } 1301 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1302 /* protocol error... send an abort */ 1303 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1304 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1305 op_err, 0, net->port); 1306 *abort_no_unlock = 1; 1307 return (-1); 1308 } 1309 if (init_ack->num_inbound_streams == 0) { 1310 /* protocol error... send an abort */ 1311 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1312 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1313 op_err, 0, net->port); 1314 *abort_no_unlock = 1; 1315 return (-1); 1316 } 1317 if (init_ack->num_outbound_streams == 0) { 1318 /* protocol error... send an abort */ 1319 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1320 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1321 op_err, 0, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 /* process according to association state... */ 1326 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1327 case SCTP_STATE_COOKIE_WAIT: 1328 /* this is the expected state for this chunk */ 1329 /* process the INIT-ACK parameters */ 1330 if (stcb->asoc.primary_destination->dest_state & 1331 SCTP_ADDR_UNCONFIRMED) { 1332 /* 1333 * The primary is where we sent the INIT, we can 1334 * always consider it confirmed when the INIT-ACK is 1335 * returned. Do this before we load addresses 1336 * though. 1337 */ 1338 stcb->asoc.primary_destination->dest_state &= 1339 ~SCTP_ADDR_UNCONFIRMED; 1340 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1341 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1342 } 1343 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1344 net, abort_no_unlock, vrf_id) < 0) { 1345 /* error in parsing parameters */ 1346 return (-1); 1347 } 1348 /* update our state */ 1349 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1350 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1351 1352 /* reset the RTO calc */ 1353 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1354 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1355 stcb->asoc.overall_error_count, 1356 0, 1357 SCTP_FROM_SCTP_INPUT, 1358 __LINE__); 1359 } 1360 stcb->asoc.overall_error_count = 0; 1361 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1362 /* 1363 * collapse the init timer back in case of a exponential 1364 * backoff 1365 */ 1366 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1367 stcb, net); 1368 /* 1369 * the send at the end of the inbound data processing will 1370 * cause the cookie to be sent 1371 */ 1372 break; 1373 case SCTP_STATE_SHUTDOWN_SENT: 1374 /* incorrect state... discard */ 1375 break; 1376 case SCTP_STATE_COOKIE_ECHOED: 1377 /* incorrect state... discard */ 1378 break; 1379 case SCTP_STATE_OPEN: 1380 /* incorrect state... discard */ 1381 break; 1382 case SCTP_STATE_EMPTY: 1383 case SCTP_STATE_INUSE: 1384 default: 1385 /* incorrect state... discard */ 1386 return (-1); 1387 break; 1388 } 1389 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1390 return (0); 1391 } 1392 1393 static struct sctp_tcb * 1394 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1395 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1396 struct sctp_inpcb *inp, struct sctp_nets **netp, 1397 struct sockaddr *init_src, int *notification, 1398 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1399 uint32_t vrf_id, uint16_t port); 1400 1401 1402 /* 1403 * handle a state cookie for an existing association m: input packet mbuf 1404 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1405 * "split" mbuf and the cookie signature does not exist offset: offset into 1406 * mbuf to the cookie-echo chunk 1407 */ 1408 static struct sctp_tcb * 1409 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1410 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1411 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1412 struct sockaddr *init_src, int *notification, 1413 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1414 { 1415 struct sctp_association *asoc; 1416 struct sctp_init_chunk *init_cp, init_buf; 1417 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1418 struct sctp_nets *net; 1419 struct mbuf *op_err; 1420 struct sctp_paramhdr *ph; 1421 int init_offset, initack_offset, i; 1422 int retval; 1423 int spec_flag = 0; 1424 uint32_t how_indx; 1425 1426 net = *netp; 1427 /* I know that the TCB is non-NULL from the caller */ 1428 asoc = &stcb->asoc; 1429 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1430 if (asoc->cookie_how[how_indx] == 0) 1431 break; 1432 } 1433 if (how_indx < sizeof(asoc->cookie_how)) { 1434 asoc->cookie_how[how_indx] = 1; 1435 } 1436 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1437 /* SHUTDOWN came in after sending INIT-ACK */ 1438 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1439 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1440 0, M_DONTWAIT, 1, MT_DATA); 1441 if (op_err == NULL) { 1442 /* FOOBAR */ 1443 return (NULL); 1444 } 1445 /* Set the len */ 1446 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1447 ph = mtod(op_err, struct sctp_paramhdr *); 1448 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1449 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1450 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1451 vrf_id, net->port); 1452 if (how_indx < sizeof(asoc->cookie_how)) 1453 asoc->cookie_how[how_indx] = 2; 1454 return (NULL); 1455 } 1456 /* 1457 * find and validate the INIT chunk in the cookie (peer's info) the 1458 * INIT should start after the cookie-echo header struct (chunk 1459 * header, state cookie header struct) 1460 */ 1461 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1462 1463 init_cp = (struct sctp_init_chunk *) 1464 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1465 (uint8_t *) & init_buf); 1466 if (init_cp == NULL) { 1467 /* could not pull a INIT chunk in cookie */ 1468 return (NULL); 1469 } 1470 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1471 return (NULL); 1472 } 1473 /* 1474 * find and validate the INIT-ACK chunk in the cookie (my info) the 1475 * INIT-ACK follows the INIT chunk 1476 */ 1477 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1478 initack_cp = (struct sctp_init_ack_chunk *) 1479 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1480 (uint8_t *) & initack_buf); 1481 if (initack_cp == NULL) { 1482 /* could not pull INIT-ACK chunk in cookie */ 1483 return (NULL); 1484 } 1485 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1486 return (NULL); 1487 } 1488 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1489 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1490 /* 1491 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1492 * to get into the OPEN state 1493 */ 1494 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1495 /*- 1496 * Opps, this means that we somehow generated two vtag's 1497 * the same. I.e. we did: 1498 * Us Peer 1499 * <---INIT(tag=a)------ 1500 * ----INIT-ACK(tag=t)--> 1501 * ----INIT(tag=t)------> *1 1502 * <---INIT-ACK(tag=a)--- 1503 * <----CE(tag=t)------------- *2 1504 * 1505 * At point *1 we should be generating a different 1506 * tag t'. Which means we would throw away the CE and send 1507 * ours instead. Basically this is case C (throw away side). 1508 */ 1509 if (how_indx < sizeof(asoc->cookie_how)) 1510 asoc->cookie_how[how_indx] = 17; 1511 return (NULL); 1512 1513 } 1514 switch SCTP_GET_STATE 1515 (asoc) { 1516 case SCTP_STATE_COOKIE_WAIT: 1517 case SCTP_STATE_COOKIE_ECHOED: 1518 /* 1519 * INIT was sent but got a COOKIE_ECHO with the 1520 * correct tags... just accept it...but we must 1521 * process the init so that we can make sure we have 1522 * the right seq no's. 1523 */ 1524 /* First we must process the INIT !! */ 1525 retval = sctp_process_init(init_cp, stcb); 1526 if (retval < 0) { 1527 if (how_indx < sizeof(asoc->cookie_how)) 1528 asoc->cookie_how[how_indx] = 3; 1529 return (NULL); 1530 } 1531 /* we have already processed the INIT so no problem */ 1532 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1533 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1534 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1535 /* update current state */ 1536 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1537 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1538 else 1539 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1540 1541 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1542 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1543 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1544 stcb->sctp_ep, stcb, asoc->primary_destination); 1545 } 1546 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1547 sctp_stop_all_cookie_timers(stcb); 1548 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1549 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1550 (inp->sctp_socket->so_qlimit == 0) 1551 ) { 1552 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1553 struct socket *so; 1554 1555 #endif 1556 /* 1557 * Here is where collision would go if we 1558 * did a connect() and instead got a 1559 * init/init-ack/cookie done before the 1560 * init-ack came back.. 1561 */ 1562 stcb->sctp_ep->sctp_flags |= 1563 SCTP_PCB_FLAGS_CONNECTED; 1564 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1565 so = SCTP_INP_SO(stcb->sctp_ep); 1566 atomic_add_int(&stcb->asoc.refcnt, 1); 1567 SCTP_TCB_UNLOCK(stcb); 1568 SCTP_SOCKET_LOCK(so, 1); 1569 SCTP_TCB_LOCK(stcb); 1570 atomic_add_int(&stcb->asoc.refcnt, -1); 1571 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1572 SCTP_SOCKET_UNLOCK(so, 1); 1573 return (NULL); 1574 } 1575 #endif 1576 soisconnected(stcb->sctp_socket); 1577 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1578 SCTP_SOCKET_UNLOCK(so, 1); 1579 #endif 1580 } 1581 /* notify upper layer */ 1582 *notification = SCTP_NOTIFY_ASSOC_UP; 1583 /* 1584 * since we did not send a HB make sure we don't 1585 * double things 1586 */ 1587 net->hb_responded = 1; 1588 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1589 &cookie->time_entered, 1590 sctp_align_unsafe_makecopy, 1591 SCTP_RTT_FROM_NON_DATA); 1592 1593 if (stcb->asoc.sctp_autoclose_ticks && 1594 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1595 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1596 inp, stcb, NULL); 1597 } 1598 break; 1599 default: 1600 /* 1601 * we're in the OPEN state (or beyond), so peer must 1602 * have simply lost the COOKIE-ACK 1603 */ 1604 break; 1605 } /* end switch */ 1606 sctp_stop_all_cookie_timers(stcb); 1607 /* 1608 * We ignore the return code here.. not sure if we should 1609 * somehow abort.. but we do have an existing asoc. This 1610 * really should not fail. 1611 */ 1612 if (sctp_load_addresses_from_init(stcb, m, 1613 init_offset + sizeof(struct sctp_init_chunk), 1614 initack_offset, sh, init_src)) { 1615 if (how_indx < sizeof(asoc->cookie_how)) 1616 asoc->cookie_how[how_indx] = 4; 1617 return (NULL); 1618 } 1619 /* respond with a COOKIE-ACK */ 1620 sctp_toss_old_cookies(stcb, asoc); 1621 sctp_send_cookie_ack(stcb); 1622 if (how_indx < sizeof(asoc->cookie_how)) 1623 asoc->cookie_how[how_indx] = 5; 1624 return (stcb); 1625 } 1626 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1627 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1628 cookie->tie_tag_my_vtag == 0 && 1629 cookie->tie_tag_peer_vtag == 0) { 1630 /* 1631 * case C in Section 5.2.4 Table 2: XMOO silently discard 1632 */ 1633 if (how_indx < sizeof(asoc->cookie_how)) 1634 asoc->cookie_how[how_indx] = 6; 1635 return (NULL); 1636 } 1637 /* 1638 * If nat support, and the below and stcb is established, send back 1639 * a ABORT(colliding state) if we are established. 1640 */ 1641 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1642 (asoc->peer_supports_nat) && 1643 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1644 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1645 (asoc->peer_vtag == 0)))) { 1646 /* 1647 * Special case - Peer's support nat. We may have two init's 1648 * that we gave out the same tag on since one was not 1649 * established.. i.e. we get INIT from host-1 behind the nat 1650 * and we respond tag-a, we get a INIT from host-2 behind 1651 * the nat and we get tag-a again. Then we bring up host-1 1652 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1653 * Now we have colliding state. We must send an abort here 1654 * with colliding state indication. 1655 */ 1656 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1657 0, M_DONTWAIT, 1, MT_DATA); 1658 if (op_err == NULL) { 1659 /* FOOBAR */ 1660 return (NULL); 1661 } 1662 /* pre-reserve some space */ 1663 #ifdef INET6 1664 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1665 #else 1666 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1667 #endif 1668 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1669 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1670 /* Set the len */ 1671 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1672 ph = mtod(op_err, struct sctp_paramhdr *); 1673 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1674 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1675 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1676 return (NULL); 1677 } 1678 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1679 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1680 (asoc->peer_vtag == 0))) { 1681 /* 1682 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1683 * should be ok, re-accept peer info 1684 */ 1685 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1686 /* 1687 * Extension of case C. If we hit this, then the 1688 * random number generator returned the same vtag 1689 * when we first sent our INIT-ACK and when we later 1690 * sent our INIT. The side with the seq numbers that 1691 * are different will be the one that normnally 1692 * would have hit case C. This in effect "extends" 1693 * our vtags in this collision case to be 64 bits. 1694 * The same collision could occur aka you get both 1695 * vtag and seq number the same twice in a row.. but 1696 * is much less likely. If it did happen then we 1697 * would proceed through and bring up the assoc.. we 1698 * may end up with the wrong stream setup however.. 1699 * which would be bad.. but there is no way to 1700 * tell.. until we send on a stream that does not 1701 * exist :-) 1702 */ 1703 if (how_indx < sizeof(asoc->cookie_how)) 1704 asoc->cookie_how[how_indx] = 7; 1705 1706 return (NULL); 1707 } 1708 if (how_indx < sizeof(asoc->cookie_how)) 1709 asoc->cookie_how[how_indx] = 8; 1710 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1711 sctp_stop_all_cookie_timers(stcb); 1712 /* 1713 * since we did not send a HB make sure we don't double 1714 * things 1715 */ 1716 net->hb_responded = 1; 1717 if (stcb->asoc.sctp_autoclose_ticks && 1718 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1719 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1720 NULL); 1721 } 1722 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1723 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1724 1725 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1726 /* 1727 * Ok the peer probably discarded our data (if we 1728 * echoed a cookie+data). So anything on the 1729 * sent_queue should be marked for retransmit, we 1730 * may not get something to kick us so it COULD 1731 * still take a timeout to move these.. but it can't 1732 * hurt to mark them. 1733 */ 1734 struct sctp_tmit_chunk *chk; 1735 1736 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1737 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1738 chk->sent = SCTP_DATAGRAM_RESEND; 1739 sctp_flight_size_decrease(chk); 1740 sctp_total_flight_decrease(stcb, chk); 1741 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1742 spec_flag++; 1743 } 1744 } 1745 1746 } 1747 /* process the INIT info (peer's info) */ 1748 retval = sctp_process_init(init_cp, stcb); 1749 if (retval < 0) { 1750 if (how_indx < sizeof(asoc->cookie_how)) 1751 asoc->cookie_how[how_indx] = 9; 1752 return (NULL); 1753 } 1754 if (sctp_load_addresses_from_init(stcb, m, 1755 init_offset + sizeof(struct sctp_init_chunk), 1756 initack_offset, sh, init_src)) { 1757 if (how_indx < sizeof(asoc->cookie_how)) 1758 asoc->cookie_how[how_indx] = 10; 1759 return (NULL); 1760 } 1761 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1762 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1763 *notification = SCTP_NOTIFY_ASSOC_UP; 1764 1765 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1766 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1767 (inp->sctp_socket->so_qlimit == 0)) { 1768 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1769 struct socket *so; 1770 1771 #endif 1772 stcb->sctp_ep->sctp_flags |= 1773 SCTP_PCB_FLAGS_CONNECTED; 1774 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1775 so = SCTP_INP_SO(stcb->sctp_ep); 1776 atomic_add_int(&stcb->asoc.refcnt, 1); 1777 SCTP_TCB_UNLOCK(stcb); 1778 SCTP_SOCKET_LOCK(so, 1); 1779 SCTP_TCB_LOCK(stcb); 1780 atomic_add_int(&stcb->asoc.refcnt, -1); 1781 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1782 SCTP_SOCKET_UNLOCK(so, 1); 1783 return (NULL); 1784 } 1785 #endif 1786 soisconnected(stcb->sctp_socket); 1787 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 SCTP_SOCKET_UNLOCK(so, 1); 1789 #endif 1790 } 1791 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1792 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1793 else 1794 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1795 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1796 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1797 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1798 } else { 1799 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1800 } 1801 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1802 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1803 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1804 stcb->sctp_ep, stcb, asoc->primary_destination); 1805 } 1806 sctp_stop_all_cookie_timers(stcb); 1807 sctp_toss_old_cookies(stcb, asoc); 1808 sctp_send_cookie_ack(stcb); 1809 if (spec_flag) { 1810 /* 1811 * only if we have retrans set do we do this. What 1812 * this call does is get only the COOKIE-ACK out and 1813 * then when we return the normal call to 1814 * sctp_chunk_output will get the retrans out behind 1815 * this. 1816 */ 1817 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1818 } 1819 if (how_indx < sizeof(asoc->cookie_how)) 1820 asoc->cookie_how[how_indx] = 11; 1821 1822 return (stcb); 1823 } 1824 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1825 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1826 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1827 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1828 cookie->tie_tag_peer_vtag != 0) { 1829 struct sctpasochead *head; 1830 1831 if (asoc->peer_supports_nat) { 1832 /* 1833 * This is a gross gross hack. just call the 1834 * cookie_new code since we are allowing a duplicate 1835 * association. I hope this works... 1836 */ 1837 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1838 inp, netp, init_src, notification, 1839 auth_skipped, auth_offset, auth_len, 1840 vrf_id, port)); 1841 } 1842 /* 1843 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1844 */ 1845 /* temp code */ 1846 if (how_indx < sizeof(asoc->cookie_how)) 1847 asoc->cookie_how[how_indx] = 12; 1848 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1849 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1850 1851 /* notify upper layer */ 1852 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1853 atomic_add_int(&stcb->asoc.refcnt, 1); 1854 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1855 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1856 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1857 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1858 } 1859 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1860 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1861 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1862 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1863 } 1864 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1865 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1866 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1867 stcb->sctp_ep, stcb, asoc->primary_destination); 1868 1869 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1870 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1871 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1872 } 1873 asoc->pre_open_streams = 1874 ntohs(initack_cp->init.num_outbound_streams); 1875 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1876 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1877 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1878 1879 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1880 1881 asoc->str_reset_seq_in = asoc->init_seq_number; 1882 1883 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1884 if (asoc->mapping_array) { 1885 memset(asoc->mapping_array, 0, 1886 asoc->mapping_array_size); 1887 } 1888 if (asoc->nr_mapping_array) { 1889 memset(asoc->nr_mapping_array, 0, 1890 asoc->mapping_array_size); 1891 } 1892 SCTP_TCB_UNLOCK(stcb); 1893 SCTP_INP_INFO_WLOCK(); 1894 SCTP_INP_WLOCK(stcb->sctp_ep); 1895 SCTP_TCB_LOCK(stcb); 1896 atomic_add_int(&stcb->asoc.refcnt, -1); 1897 /* send up all the data */ 1898 SCTP_TCB_SEND_LOCK(stcb); 1899 1900 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1901 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1902 stcb->asoc.strmout[i].stream_no = i; 1903 stcb->asoc.strmout[i].next_sequence_sent = 0; 1904 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1905 } 1906 /* process the INIT-ACK info (my info) */ 1907 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1908 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1909 1910 /* pull from vtag hash */ 1911 LIST_REMOVE(stcb, sctp_asocs); 1912 /* re-insert to new vtag position */ 1913 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1914 SCTP_BASE_INFO(hashasocmark))]; 1915 /* 1916 * put it in the bucket in the vtag hash of assoc's for the 1917 * system 1918 */ 1919 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1920 1921 /* process the INIT info (peer's info) */ 1922 SCTP_TCB_SEND_UNLOCK(stcb); 1923 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1924 SCTP_INP_INFO_WUNLOCK(); 1925 1926 retval = sctp_process_init(init_cp, stcb); 1927 if (retval < 0) { 1928 if (how_indx < sizeof(asoc->cookie_how)) 1929 asoc->cookie_how[how_indx] = 13; 1930 1931 return (NULL); 1932 } 1933 /* 1934 * since we did not send a HB make sure we don't double 1935 * things 1936 */ 1937 net->hb_responded = 1; 1938 1939 if (sctp_load_addresses_from_init(stcb, m, 1940 init_offset + sizeof(struct sctp_init_chunk), 1941 initack_offset, sh, init_src)) { 1942 if (how_indx < sizeof(asoc->cookie_how)) 1943 asoc->cookie_how[how_indx] = 14; 1944 1945 return (NULL); 1946 } 1947 /* respond with a COOKIE-ACK */ 1948 sctp_stop_all_cookie_timers(stcb); 1949 sctp_toss_old_cookies(stcb, asoc); 1950 sctp_send_cookie_ack(stcb); 1951 if (how_indx < sizeof(asoc->cookie_how)) 1952 asoc->cookie_how[how_indx] = 15; 1953 1954 return (stcb); 1955 } 1956 if (how_indx < sizeof(asoc->cookie_how)) 1957 asoc->cookie_how[how_indx] = 16; 1958 /* all other cases... */ 1959 return (NULL); 1960 } 1961 1962 1963 /* 1964 * handle a state cookie for a new association m: input packet mbuf chain-- 1965 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1966 * and the cookie signature does not exist offset: offset into mbuf to the 1967 * cookie-echo chunk length: length of the cookie chunk to: where the init 1968 * was from returns a new TCB 1969 */ 1970 struct sctp_tcb * 1971 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1972 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1973 struct sctp_inpcb *inp, struct sctp_nets **netp, 1974 struct sockaddr *init_src, int *notification, 1975 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1976 uint32_t vrf_id, uint16_t port) 1977 { 1978 struct sctp_tcb *stcb; 1979 struct sctp_init_chunk *init_cp, init_buf; 1980 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1981 struct sockaddr_storage sa_store; 1982 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1983 struct sctp_association *asoc; 1984 int init_offset, initack_offset, initack_limit; 1985 int retval; 1986 int error = 0; 1987 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1988 1989 #ifdef INET 1990 struct sockaddr_in *sin; 1991 1992 #endif 1993 #ifdef INET6 1994 struct sockaddr_in6 *sin6; 1995 1996 #endif 1997 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1998 struct socket *so; 1999 2000 so = SCTP_INP_SO(inp); 2001 #endif 2002 2003 /* 2004 * find and validate the INIT chunk in the cookie (peer's info) the 2005 * INIT should start after the cookie-echo header struct (chunk 2006 * header, state cookie header struct) 2007 */ 2008 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2009 init_cp = (struct sctp_init_chunk *) 2010 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2011 (uint8_t *) & init_buf); 2012 if (init_cp == NULL) { 2013 /* could not pull a INIT chunk in cookie */ 2014 SCTPDBG(SCTP_DEBUG_INPUT1, 2015 "process_cookie_new: could not pull INIT chunk hdr\n"); 2016 return (NULL); 2017 } 2018 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2019 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2020 return (NULL); 2021 } 2022 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2023 /* 2024 * find and validate the INIT-ACK chunk in the cookie (my info) the 2025 * INIT-ACK follows the INIT chunk 2026 */ 2027 initack_cp = (struct sctp_init_ack_chunk *) 2028 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2029 (uint8_t *) & initack_buf); 2030 if (initack_cp == NULL) { 2031 /* could not pull INIT-ACK chunk in cookie */ 2032 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2033 return (NULL); 2034 } 2035 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2036 return (NULL); 2037 } 2038 /* 2039 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2040 * "initack_limit" value. This is because the chk_length field 2041 * includes the length of the cookie, but the cookie is omitted when 2042 * the INIT and INIT_ACK are tacked onto the cookie... 2043 */ 2044 initack_limit = offset + cookie_len; 2045 2046 /* 2047 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2048 * and popluate 2049 */ 2050 2051 /* 2052 * Here we do a trick, we set in NULL for the proc/thread argument. 2053 * We do this since in effect we only use the p argument when the 2054 * socket is unbound and we must do an implicit bind. Since we are 2055 * getting a cookie, we cannot be unbound. 2056 */ 2057 stcb = sctp_aloc_assoc(inp, init_src, &error, 2058 ntohl(initack_cp->init.initiate_tag), vrf_id, 2059 (struct thread *)NULL 2060 ); 2061 if (stcb == NULL) { 2062 struct mbuf *op_err; 2063 2064 /* memory problem? */ 2065 SCTPDBG(SCTP_DEBUG_INPUT1, 2066 "process_cookie_new: no room for another TCB!\n"); 2067 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2068 2069 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2070 sh, op_err, vrf_id, port); 2071 return (NULL); 2072 } 2073 /* get the correct sctp_nets */ 2074 if (netp) 2075 *netp = sctp_findnet(stcb, init_src); 2076 2077 asoc = &stcb->asoc; 2078 /* get scope variables out of cookie */ 2079 asoc->ipv4_local_scope = cookie->ipv4_scope; 2080 asoc->site_scope = cookie->site_scope; 2081 asoc->local_scope = cookie->local_scope; 2082 asoc->loopback_scope = cookie->loopback_scope; 2083 2084 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2085 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2086 struct mbuf *op_err; 2087 2088 /* 2089 * Houston we have a problem. The EP changed while the 2090 * cookie was in flight. Only recourse is to abort the 2091 * association. 2092 */ 2093 atomic_add_int(&stcb->asoc.refcnt, 1); 2094 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2095 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2096 sh, op_err, vrf_id, port); 2097 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2098 SCTP_TCB_UNLOCK(stcb); 2099 SCTP_SOCKET_LOCK(so, 1); 2100 SCTP_TCB_LOCK(stcb); 2101 #endif 2102 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2103 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2104 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2105 SCTP_SOCKET_UNLOCK(so, 1); 2106 #endif 2107 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2108 return (NULL); 2109 } 2110 /* process the INIT-ACK info (my info) */ 2111 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2112 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2113 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2114 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2115 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2116 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2117 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2118 asoc->str_reset_seq_in = asoc->init_seq_number; 2119 2120 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2121 2122 /* process the INIT info (peer's info) */ 2123 if (netp) 2124 retval = sctp_process_init(init_cp, stcb); 2125 else 2126 retval = 0; 2127 if (retval < 0) { 2128 atomic_add_int(&stcb->asoc.refcnt, 1); 2129 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2130 SCTP_TCB_UNLOCK(stcb); 2131 SCTP_SOCKET_LOCK(so, 1); 2132 SCTP_TCB_LOCK(stcb); 2133 #endif 2134 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2135 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2136 SCTP_SOCKET_UNLOCK(so, 1); 2137 #endif 2138 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2139 return (NULL); 2140 } 2141 /* load all addresses */ 2142 if (sctp_load_addresses_from_init(stcb, m, 2143 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2144 init_src)) { 2145 atomic_add_int(&stcb->asoc.refcnt, 1); 2146 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2147 SCTP_TCB_UNLOCK(stcb); 2148 SCTP_SOCKET_LOCK(so, 1); 2149 SCTP_TCB_LOCK(stcb); 2150 #endif 2151 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2152 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_SOCKET_UNLOCK(so, 1); 2154 #endif 2155 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2156 return (NULL); 2157 } 2158 /* 2159 * verify any preceding AUTH chunk that was skipped 2160 */ 2161 /* pull the local authentication parameters from the cookie/init-ack */ 2162 sctp_auth_get_cookie_params(stcb, m, 2163 initack_offset + sizeof(struct sctp_init_ack_chunk), 2164 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2165 if (auth_skipped) { 2166 struct sctp_auth_chunk *auth; 2167 2168 auth = (struct sctp_auth_chunk *) 2169 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2170 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2171 /* auth HMAC failed, dump the assoc and packet */ 2172 SCTPDBG(SCTP_DEBUG_AUTH1, 2173 "COOKIE-ECHO: AUTH failed\n"); 2174 atomic_add_int(&stcb->asoc.refcnt, 1); 2175 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2176 SCTP_TCB_UNLOCK(stcb); 2177 SCTP_SOCKET_LOCK(so, 1); 2178 SCTP_TCB_LOCK(stcb); 2179 #endif 2180 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2181 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2182 SCTP_SOCKET_UNLOCK(so, 1); 2183 #endif 2184 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2185 return (NULL); 2186 } else { 2187 /* remaining chunks checked... good to go */ 2188 stcb->asoc.authenticated = 1; 2189 } 2190 } 2191 /* update current state */ 2192 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2193 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2194 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2195 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2196 stcb->sctp_ep, stcb, asoc->primary_destination); 2197 } 2198 sctp_stop_all_cookie_timers(stcb); 2199 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2200 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2201 2202 /* 2203 * if we're doing ASCONFs, check to see if we have any new local 2204 * addresses that need to get added to the peer (eg. addresses 2205 * changed while cookie echo in flight). This needs to be done 2206 * after we go to the OPEN state to do the correct asconf 2207 * processing. else, make sure we have the correct addresses in our 2208 * lists 2209 */ 2210 2211 /* warning, we re-use sin, sin6, sa_store here! */ 2212 /* pull in local_address (our "from" address) */ 2213 switch (cookie->laddr_type) { 2214 #ifdef INET 2215 case SCTP_IPV4_ADDRESS: 2216 /* source addr is IPv4 */ 2217 sin = (struct sockaddr_in *)initack_src; 2218 memset(sin, 0, sizeof(*sin)); 2219 sin->sin_family = AF_INET; 2220 sin->sin_len = sizeof(struct sockaddr_in); 2221 sin->sin_addr.s_addr = cookie->laddress[0]; 2222 break; 2223 #endif 2224 #ifdef INET6 2225 case SCTP_IPV6_ADDRESS: 2226 /* source addr is IPv6 */ 2227 sin6 = (struct sockaddr_in6 *)initack_src; 2228 memset(sin6, 0, sizeof(*sin6)); 2229 sin6->sin6_family = AF_INET6; 2230 sin6->sin6_len = sizeof(struct sockaddr_in6); 2231 sin6->sin6_scope_id = cookie->scope_id; 2232 memcpy(&sin6->sin6_addr, cookie->laddress, 2233 sizeof(sin6->sin6_addr)); 2234 break; 2235 #endif 2236 default: 2237 atomic_add_int(&stcb->asoc.refcnt, 1); 2238 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2239 SCTP_TCB_UNLOCK(stcb); 2240 SCTP_SOCKET_LOCK(so, 1); 2241 SCTP_TCB_LOCK(stcb); 2242 #endif 2243 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2244 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2245 SCTP_SOCKET_UNLOCK(so, 1); 2246 #endif 2247 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2248 return (NULL); 2249 } 2250 2251 /* set up to notify upper layer */ 2252 *notification = SCTP_NOTIFY_ASSOC_UP; 2253 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2254 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2255 (inp->sctp_socket->so_qlimit == 0)) { 2256 /* 2257 * This is an endpoint that called connect() how it got a 2258 * cookie that is NEW is a bit of a mystery. It must be that 2259 * the INIT was sent, but before it got there.. a complete 2260 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2261 * should have went to the other code.. not here.. oh well.. 2262 * a bit of protection is worth having.. 2263 */ 2264 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2265 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2266 atomic_add_int(&stcb->asoc.refcnt, 1); 2267 SCTP_TCB_UNLOCK(stcb); 2268 SCTP_SOCKET_LOCK(so, 1); 2269 SCTP_TCB_LOCK(stcb); 2270 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2271 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2272 SCTP_SOCKET_UNLOCK(so, 1); 2273 return (NULL); 2274 } 2275 #endif 2276 soisconnected(stcb->sctp_socket); 2277 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2278 SCTP_SOCKET_UNLOCK(so, 1); 2279 #endif 2280 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2281 (inp->sctp_socket->so_qlimit)) { 2282 /* 2283 * We don't want to do anything with this one. Since it is 2284 * the listening guy. The timer will get started for 2285 * accepted connections in the caller. 2286 */ 2287 ; 2288 } 2289 /* since we did not send a HB make sure we don't double things */ 2290 if ((netp) && (*netp)) 2291 (*netp)->hb_responded = 1; 2292 2293 if (stcb->asoc.sctp_autoclose_ticks && 2294 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2295 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2296 } 2297 /* calculate the RTT */ 2298 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2299 if ((netp) && (*netp)) { 2300 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2301 &cookie->time_entered, sctp_align_unsafe_makecopy, 2302 SCTP_RTT_FROM_NON_DATA); 2303 } 2304 /* respond with a COOKIE-ACK */ 2305 sctp_send_cookie_ack(stcb); 2306 2307 /* 2308 * check the address lists for any ASCONFs that need to be sent 2309 * AFTER the cookie-ack is sent 2310 */ 2311 sctp_check_address_list(stcb, m, 2312 initack_offset + sizeof(struct sctp_init_ack_chunk), 2313 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2314 initack_src, cookie->local_scope, cookie->site_scope, 2315 cookie->ipv4_scope, cookie->loopback_scope); 2316 2317 2318 return (stcb); 2319 } 2320 2321 /* 2322 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2323 * we NEED to make sure we are not already using the vtag. If so we 2324 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2325 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2326 SCTP_BASE_INFO(hashasocmark))]; 2327 LIST_FOREACH(stcb, head, sctp_asocs) { 2328 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2329 -- SEND ABORT - TRY AGAIN -- 2330 } 2331 } 2332 */ 2333 2334 /* 2335 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2336 * existing (non-NULL) TCB 2337 */ 2338 static struct mbuf * 2339 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2340 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2341 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2342 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2343 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2344 { 2345 struct sctp_state_cookie *cookie; 2346 struct sctp_tcb *l_stcb = *stcb; 2347 struct sctp_inpcb *l_inp; 2348 struct sockaddr *to; 2349 struct sctp_pcb *ep; 2350 struct mbuf *m_sig; 2351 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2352 uint8_t *sig; 2353 uint8_t cookie_ok = 0; 2354 unsigned int size_of_pkt, sig_offset, cookie_offset; 2355 unsigned int cookie_len; 2356 struct timeval now; 2357 struct timeval time_expires; 2358 struct sockaddr_storage dest_store; 2359 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2360 struct ip *iph; 2361 int notification = 0; 2362 struct sctp_nets *netl; 2363 int had_a_existing_tcb = 0; 2364 int send_int_conf = 0; 2365 2366 #ifdef INET 2367 struct sockaddr_in sin; 2368 2369 #endif 2370 #ifdef INET6 2371 struct sockaddr_in6 sin6; 2372 2373 #endif 2374 2375 SCTPDBG(SCTP_DEBUG_INPUT2, 2376 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2377 2378 if (inp_p == NULL) { 2379 return (NULL); 2380 } 2381 /* First get the destination address setup too. */ 2382 iph = mtod(m, struct ip *); 2383 switch (iph->ip_v) { 2384 #ifdef INET 2385 case IPVERSION: 2386 { 2387 /* its IPv4 */ 2388 struct sockaddr_in *lsin; 2389 2390 lsin = (struct sockaddr_in *)(localep_sa); 2391 memset(lsin, 0, sizeof(*lsin)); 2392 lsin->sin_family = AF_INET; 2393 lsin->sin_len = sizeof(*lsin); 2394 lsin->sin_port = sh->dest_port; 2395 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2396 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2397 break; 2398 } 2399 #endif 2400 #ifdef INET6 2401 case IPV6_VERSION >> 4: 2402 { 2403 /* its IPv6 */ 2404 struct ip6_hdr *ip6; 2405 struct sockaddr_in6 *lsin6; 2406 2407 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2408 memset(lsin6, 0, sizeof(*lsin6)); 2409 lsin6->sin6_family = AF_INET6; 2410 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2411 ip6 = mtod(m, struct ip6_hdr *); 2412 lsin6->sin6_port = sh->dest_port; 2413 lsin6->sin6_addr = ip6->ip6_dst; 2414 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2415 break; 2416 } 2417 #endif 2418 default: 2419 return (NULL); 2420 } 2421 2422 cookie = &cp->cookie; 2423 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2424 cookie_len = ntohs(cp->ch.chunk_length); 2425 2426 if ((cookie->peerport != sh->src_port) && 2427 (cookie->myport != sh->dest_port) && 2428 (cookie->my_vtag != sh->v_tag)) { 2429 /* 2430 * invalid ports or bad tag. Note that we always leave the 2431 * v_tag in the header in network order and when we stored 2432 * it in the my_vtag slot we also left it in network order. 2433 * This maintains the match even though it may be in the 2434 * opposite byte order of the machine :-> 2435 */ 2436 return (NULL); 2437 } 2438 if (cookie_len > size_of_pkt || 2439 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2440 sizeof(struct sctp_init_chunk) + 2441 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2442 /* cookie too long! or too small */ 2443 return (NULL); 2444 } 2445 /* 2446 * split off the signature into its own mbuf (since it should not be 2447 * calculated in the sctp_hmac_m() call). 2448 */ 2449 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2450 if (sig_offset > size_of_pkt) { 2451 /* packet not correct size! */ 2452 /* XXX this may already be accounted for earlier... */ 2453 return (NULL); 2454 } 2455 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2456 if (m_sig == NULL) { 2457 /* out of memory or ?? */ 2458 return (NULL); 2459 } 2460 #ifdef SCTP_MBUF_LOGGING 2461 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2462 struct mbuf *mat; 2463 2464 mat = m_sig; 2465 while (mat) { 2466 if (SCTP_BUF_IS_EXTENDED(mat)) { 2467 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2468 } 2469 mat = SCTP_BUF_NEXT(mat); 2470 } 2471 } 2472 #endif 2473 2474 /* 2475 * compute the signature/digest for the cookie 2476 */ 2477 ep = &(*inp_p)->sctp_ep; 2478 l_inp = *inp_p; 2479 if (l_stcb) { 2480 SCTP_TCB_UNLOCK(l_stcb); 2481 } 2482 SCTP_INP_RLOCK(l_inp); 2483 if (l_stcb) { 2484 SCTP_TCB_LOCK(l_stcb); 2485 } 2486 /* which cookie is it? */ 2487 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2488 (ep->current_secret_number != ep->last_secret_number)) { 2489 /* it's the old cookie */ 2490 (void)sctp_hmac_m(SCTP_HMAC, 2491 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2492 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2493 } else { 2494 /* it's the current cookie */ 2495 (void)sctp_hmac_m(SCTP_HMAC, 2496 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2497 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2498 } 2499 /* get the signature */ 2500 SCTP_INP_RUNLOCK(l_inp); 2501 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2502 if (sig == NULL) { 2503 /* couldn't find signature */ 2504 sctp_m_freem(m_sig); 2505 return (NULL); 2506 } 2507 /* compare the received digest with the computed digest */ 2508 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2509 /* try the old cookie? */ 2510 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2511 (ep->current_secret_number != ep->last_secret_number)) { 2512 /* compute digest with old */ 2513 (void)sctp_hmac_m(SCTP_HMAC, 2514 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2515 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2516 /* compare */ 2517 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2518 cookie_ok = 1; 2519 } 2520 } else { 2521 cookie_ok = 1; 2522 } 2523 2524 /* 2525 * Now before we continue we must reconstruct our mbuf so that 2526 * normal processing of any other chunks will work. 2527 */ 2528 { 2529 struct mbuf *m_at; 2530 2531 m_at = m; 2532 while (SCTP_BUF_NEXT(m_at) != NULL) { 2533 m_at = SCTP_BUF_NEXT(m_at); 2534 } 2535 SCTP_BUF_NEXT(m_at) = m_sig; 2536 } 2537 2538 if (cookie_ok == 0) { 2539 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2540 SCTPDBG(SCTP_DEBUG_INPUT2, 2541 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2542 (uint32_t) offset, cookie_offset, sig_offset); 2543 return (NULL); 2544 } 2545 /* 2546 * check the cookie timestamps to be sure it's not stale 2547 */ 2548 (void)SCTP_GETTIME_TIMEVAL(&now); 2549 /* Expire time is in Ticks, so we convert to seconds */ 2550 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2551 time_expires.tv_usec = cookie->time_entered.tv_usec; 2552 /* 2553 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2554 * is undefined. 2555 */ 2556 if (timevalcmp(&now, &time_expires, >)) { 2557 /* cookie is stale! */ 2558 struct mbuf *op_err; 2559 struct sctp_stale_cookie_msg *scm; 2560 uint32_t tim; 2561 2562 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2563 0, M_DONTWAIT, 1, MT_DATA); 2564 if (op_err == NULL) { 2565 /* FOOBAR */ 2566 return (NULL); 2567 } 2568 /* Set the len */ 2569 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2570 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2571 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2572 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2573 (sizeof(uint32_t)))); 2574 /* seconds to usec */ 2575 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2576 /* add in usec */ 2577 if (tim == 0) 2578 tim = now.tv_usec - cookie->time_entered.tv_usec; 2579 scm->time_usec = htonl(tim); 2580 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2581 vrf_id, port); 2582 return (NULL); 2583 } 2584 /* 2585 * Now we must see with the lookup address if we have an existing 2586 * asoc. This will only happen if we were in the COOKIE-WAIT state 2587 * and a INIT collided with us and somewhere the peer sent the 2588 * cookie on another address besides the single address our assoc 2589 * had for him. In this case we will have one of the tie-tags set at 2590 * least AND the address field in the cookie can be used to look it 2591 * up. 2592 */ 2593 to = NULL; 2594 switch (cookie->addr_type) { 2595 #ifdef INET6 2596 case SCTP_IPV6_ADDRESS: 2597 memset(&sin6, 0, sizeof(sin6)); 2598 sin6.sin6_family = AF_INET6; 2599 sin6.sin6_len = sizeof(sin6); 2600 sin6.sin6_port = sh->src_port; 2601 sin6.sin6_scope_id = cookie->scope_id; 2602 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2603 sizeof(sin6.sin6_addr.s6_addr)); 2604 to = (struct sockaddr *)&sin6; 2605 break; 2606 #endif 2607 #ifdef INET 2608 case SCTP_IPV4_ADDRESS: 2609 memset(&sin, 0, sizeof(sin)); 2610 sin.sin_family = AF_INET; 2611 sin.sin_len = sizeof(sin); 2612 sin.sin_port = sh->src_port; 2613 sin.sin_addr.s_addr = cookie->address[0]; 2614 to = (struct sockaddr *)&sin; 2615 break; 2616 #endif 2617 default: 2618 /* This should not happen */ 2619 return (NULL); 2620 } 2621 if ((*stcb == NULL) && to) { 2622 /* Yep, lets check */ 2623 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2624 if (*stcb == NULL) { 2625 /* 2626 * We should have only got back the same inp. If we 2627 * got back a different ep we have a problem. The 2628 * original findep got back l_inp and now 2629 */ 2630 if (l_inp != *inp_p) { 2631 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2632 } 2633 } else { 2634 if (*locked_tcb == NULL) { 2635 /* 2636 * In this case we found the assoc only 2637 * after we locked the create lock. This 2638 * means we are in a colliding case and we 2639 * must make sure that we unlock the tcb if 2640 * its one of the cases where we throw away 2641 * the incoming packets. 2642 */ 2643 *locked_tcb = *stcb; 2644 2645 /* 2646 * We must also increment the inp ref count 2647 * since the ref_count flags was set when we 2648 * did not find the TCB, now we found it 2649 * which reduces the refcount.. we must 2650 * raise it back out to balance it all :-) 2651 */ 2652 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2653 if ((*stcb)->sctp_ep != l_inp) { 2654 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2655 (*stcb)->sctp_ep, l_inp); 2656 } 2657 } 2658 } 2659 } 2660 if (to == NULL) { 2661 return (NULL); 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2667 cookie_len, *inp_p, netp, to, ¬ification, 2668 auth_skipped, auth_offset, auth_len, vrf_id, port); 2669 } else { 2670 /* this is abnormal... cookie-echo on existing TCB */ 2671 had_a_existing_tcb = 1; 2672 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2673 cookie, cookie_len, *inp_p, *stcb, netp, to, 2674 ¬ification, vrf_id, auth_skipped, auth_offset, auth_len, port); 2675 } 2676 2677 if (*stcb == NULL) { 2678 /* still no TCB... must be bad cookie-echo */ 2679 return (NULL); 2680 } 2681 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2682 (*netp)->flowid = m->m_pkthdr.flowid; 2683 #ifdef INVARIANTS 2684 (*netp)->flowidset = 1; 2685 #endif 2686 } 2687 /* 2688 * Ok, we built an association so confirm the address we sent the 2689 * INIT-ACK to. 2690 */ 2691 netl = sctp_findnet(*stcb, to); 2692 /* 2693 * This code should in theory NOT run but 2694 */ 2695 if (netl == NULL) { 2696 /* TSNH! Huh, why do I need to add this address here? */ 2697 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2698 return (NULL); 2699 } 2700 netl = sctp_findnet(*stcb, to); 2701 } 2702 if (netl) { 2703 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2704 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2705 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2706 netl); 2707 send_int_conf = 1; 2708 } 2709 } 2710 sctp_start_net_timers(*stcb); 2711 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2712 if (!had_a_existing_tcb || 2713 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2714 /* 2715 * If we have a NEW cookie or the connect never 2716 * reached the connected state during collision we 2717 * must do the TCP accept thing. 2718 */ 2719 struct socket *so, *oso; 2720 struct sctp_inpcb *inp; 2721 2722 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2723 /* 2724 * For a restart we will keep the same 2725 * socket, no need to do anything. I THINK!! 2726 */ 2727 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2728 if (send_int_conf) { 2729 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2730 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2731 } 2732 return (m); 2733 } 2734 oso = (*inp_p)->sctp_socket; 2735 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2736 SCTP_TCB_UNLOCK((*stcb)); 2737 CURVNET_SET(oso->so_vnet); 2738 so = sonewconn(oso, 0 2739 ); 2740 CURVNET_RESTORE(); 2741 SCTP_TCB_LOCK((*stcb)); 2742 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2743 2744 if (so == NULL) { 2745 struct mbuf *op_err; 2746 2747 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2748 struct socket *pcb_so; 2749 2750 #endif 2751 /* Too many sockets */ 2752 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2753 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2754 sctp_abort_association(*inp_p, NULL, m, iphlen, 2755 sh, op_err, vrf_id, port); 2756 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2757 pcb_so = SCTP_INP_SO(*inp_p); 2758 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2759 SCTP_TCB_UNLOCK((*stcb)); 2760 SCTP_SOCKET_LOCK(pcb_so, 1); 2761 SCTP_TCB_LOCK((*stcb)); 2762 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2763 #endif 2764 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2765 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2766 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2767 #endif 2768 return (NULL); 2769 } 2770 inp = (struct sctp_inpcb *)so->so_pcb; 2771 SCTP_INP_INCR_REF(inp); 2772 /* 2773 * We add the unbound flag here so that if we get an 2774 * soabort() before we get the move_pcb done, we 2775 * will properly cleanup. 2776 */ 2777 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2778 SCTP_PCB_FLAGS_CONNECTED | 2779 SCTP_PCB_FLAGS_IN_TCPPOOL | 2780 SCTP_PCB_FLAGS_UNBOUND | 2781 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2782 SCTP_PCB_FLAGS_DONT_WAKE); 2783 inp->sctp_features = (*inp_p)->sctp_features; 2784 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2785 inp->sctp_socket = so; 2786 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2787 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2788 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2789 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2790 inp->sctp_context = (*inp_p)->sctp_context; 2791 inp->inp_starting_point_for_iterator = NULL; 2792 /* 2793 * copy in the authentication parameters from the 2794 * original endpoint 2795 */ 2796 if (inp->sctp_ep.local_hmacs) 2797 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2798 inp->sctp_ep.local_hmacs = 2799 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2800 if (inp->sctp_ep.local_auth_chunks) 2801 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2802 inp->sctp_ep.local_auth_chunks = 2803 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2804 2805 /* 2806 * Now we must move it from one hash table to 2807 * another and get the tcb in the right place. 2808 */ 2809 2810 /* 2811 * This is where the one-2-one socket is put into 2812 * the accept state waiting for the accept! 2813 */ 2814 if (*stcb) { 2815 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2816 } 2817 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2818 2819 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2820 SCTP_TCB_UNLOCK((*stcb)); 2821 2822 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2823 0); 2824 SCTP_TCB_LOCK((*stcb)); 2825 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2826 2827 2828 /* 2829 * now we must check to see if we were aborted while 2830 * the move was going on and the lock/unlock 2831 * happened. 2832 */ 2833 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2834 /* 2835 * yep it was, we leave the assoc attached 2836 * to the socket since the sctp_inpcb_free() 2837 * call will send an abort for us. 2838 */ 2839 SCTP_INP_DECR_REF(inp); 2840 return (NULL); 2841 } 2842 SCTP_INP_DECR_REF(inp); 2843 /* Switch over to the new guy */ 2844 *inp_p = inp; 2845 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2846 if (send_int_conf) { 2847 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2848 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2849 } 2850 /* 2851 * Pull it from the incomplete queue and wake the 2852 * guy 2853 */ 2854 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2855 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2856 SCTP_TCB_UNLOCK((*stcb)); 2857 SCTP_SOCKET_LOCK(so, 1); 2858 #endif 2859 soisconnected(so); 2860 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2861 SCTP_TCB_LOCK((*stcb)); 2862 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2863 SCTP_SOCKET_UNLOCK(so, 1); 2864 #endif 2865 return (m); 2866 } 2867 } 2868 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2869 if (notification) { 2870 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2871 } 2872 if (send_int_conf) { 2873 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2874 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2875 } 2876 } 2877 return (m); 2878 } 2879 2880 static void 2881 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2882 struct sctp_tcb *stcb, struct sctp_nets *net) 2883 { 2884 /* cp must not be used, others call this without a c-ack :-) */ 2885 struct sctp_association *asoc; 2886 2887 SCTPDBG(SCTP_DEBUG_INPUT2, 2888 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2889 if (stcb == NULL) 2890 return; 2891 2892 asoc = &stcb->asoc; 2893 2894 sctp_stop_all_cookie_timers(stcb); 2895 /* process according to association state */ 2896 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2897 /* state change only needed when I am in right state */ 2898 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2899 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2900 sctp_start_net_timers(stcb); 2901 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2902 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2903 stcb->sctp_ep, stcb, asoc->primary_destination); 2904 2905 } 2906 /* update RTO */ 2907 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2908 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2909 if (asoc->overall_error_count == 0) { 2910 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2911 &asoc->time_entered, sctp_align_safe_nocopy, 2912 SCTP_RTT_FROM_NON_DATA); 2913 } 2914 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2915 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2916 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2917 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2918 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2919 struct socket *so; 2920 2921 #endif 2922 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2923 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2924 so = SCTP_INP_SO(stcb->sctp_ep); 2925 atomic_add_int(&stcb->asoc.refcnt, 1); 2926 SCTP_TCB_UNLOCK(stcb); 2927 SCTP_SOCKET_LOCK(so, 1); 2928 SCTP_TCB_LOCK(stcb); 2929 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2930 #endif 2931 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2932 soisconnected(stcb->sctp_socket); 2933 } 2934 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2935 SCTP_SOCKET_UNLOCK(so, 1); 2936 #endif 2937 } 2938 /* 2939 * since we did not send a HB make sure we don't double 2940 * things 2941 */ 2942 net->hb_responded = 1; 2943 2944 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2945 /* 2946 * We don't need to do the asconf thing, nor hb or 2947 * autoclose if the socket is closed. 2948 */ 2949 goto closed_socket; 2950 } 2951 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2952 stcb, net); 2953 2954 2955 if (stcb->asoc.sctp_autoclose_ticks && 2956 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2957 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2958 stcb->sctp_ep, stcb, NULL); 2959 } 2960 /* 2961 * send ASCONF if parameters are pending and ASCONFs are 2962 * allowed (eg. addresses changed when init/cookie echo were 2963 * in flight) 2964 */ 2965 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2966 (stcb->asoc.peer_supports_asconf) && 2967 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2968 #ifdef SCTP_TIMER_BASED_ASCONF 2969 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2970 stcb->sctp_ep, stcb, 2971 stcb->asoc.primary_destination); 2972 #else 2973 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2974 SCTP_ADDR_NOT_LOCKED); 2975 #endif 2976 } 2977 } 2978 closed_socket: 2979 /* Toss the cookie if I can */ 2980 sctp_toss_old_cookies(stcb, asoc); 2981 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2982 /* Restart the timer if we have pending data */ 2983 struct sctp_tmit_chunk *chk; 2984 2985 chk = TAILQ_FIRST(&asoc->sent_queue); 2986 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2987 } 2988 } 2989 2990 static void 2991 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2992 struct sctp_tcb *stcb) 2993 { 2994 struct sctp_nets *net; 2995 struct sctp_tmit_chunk *lchk; 2996 struct sctp_ecne_chunk bkup; 2997 uint8_t override_bit; 2998 uint32_t tsn, window_data_tsn; 2999 int len; 3000 unsigned int pkt_cnt; 3001 3002 len = ntohs(cp->ch.chunk_length); 3003 if ((len != sizeof(struct sctp_ecne_chunk)) && 3004 (len != sizeof(struct old_sctp_ecne_chunk))) { 3005 return; 3006 } 3007 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3008 /* Its the old format */ 3009 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3010 bkup.num_pkts_since_cwr = htonl(1); 3011 cp = &bkup; 3012 } 3013 SCTP_STAT_INCR(sctps_recvecne); 3014 tsn = ntohl(cp->tsn); 3015 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3016 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3017 if (lchk == NULL) { 3018 window_data_tsn = stcb->asoc.sending_seq - 1; 3019 } else { 3020 window_data_tsn = lchk->rec.data.TSN_seq; 3021 } 3022 3023 /* Find where it was sent to if possible. */ 3024 net = NULL; 3025 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3026 if (lchk->rec.data.TSN_seq == tsn) { 3027 net = lchk->whoTo; 3028 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3029 break; 3030 } 3031 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3032 break; 3033 } 3034 } 3035 if (net == NULL) { 3036 /* 3037 * What to do. A previous send of a CWR was possibly lost. 3038 * See how old it is, we may have it marked on the actual 3039 * net. 3040 */ 3041 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3042 if (tsn == net->last_cwr_tsn) { 3043 /* Found him, send it off */ 3044 break; 3045 } 3046 } 3047 if (net == NULL) { 3048 /* 3049 * If we reach here, we need to send a special CWR 3050 * that says hey, we did this a long time ago and 3051 * you lost the response. 3052 */ 3053 net = TAILQ_FIRST(&stcb->asoc.nets); 3054 if (net == NULL) { 3055 /* TSNH */ 3056 return; 3057 } 3058 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3059 } else { 3060 override_bit = 0; 3061 } 3062 } else { 3063 override_bit = 0; 3064 } 3065 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3066 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3067 /* 3068 * JRS - Use the congestion control given in the pluggable 3069 * CC module 3070 */ 3071 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3072 /* 3073 * We reduce once every RTT. So we will only lower cwnd at 3074 * the next sending seq i.e. the window_data_tsn 3075 */ 3076 net->cwr_window_tsn = window_data_tsn; 3077 net->ecn_ce_pkt_cnt += pkt_cnt; 3078 net->lost_cnt = pkt_cnt; 3079 net->last_cwr_tsn = tsn; 3080 } else { 3081 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3082 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3083 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3084 /* 3085 * Another loss in the same window update how many 3086 * marks/packets lost we have had. 3087 */ 3088 int cnt = 1; 3089 3090 if (pkt_cnt > net->lost_cnt) { 3091 /* Should be the case */ 3092 cnt = (pkt_cnt - net->lost_cnt); 3093 net->ecn_ce_pkt_cnt += cnt; 3094 } 3095 net->lost_cnt = pkt_cnt; 3096 net->last_cwr_tsn = tsn; 3097 /* 3098 * Most CC functions will ignore this call, since we 3099 * are in-window yet of the initial CE the peer saw. 3100 */ 3101 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3102 } 3103 } 3104 /* 3105 * We always send a CWR this way if our previous one was lost our 3106 * peer will get an update, or if it is not time again to reduce we 3107 * still get the cwr to the peer. Note we set the override when we 3108 * could not find the TSN on the chunk or the destination network. 3109 */ 3110 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3111 } 3112 3113 static void 3114 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3115 { 3116 /* 3117 * Here we get a CWR from the peer. We must look in the outqueue and 3118 * make sure that we have a covered ECNE in teh control chunk part. 3119 * If so remove it. 3120 */ 3121 struct sctp_tmit_chunk *chk; 3122 struct sctp_ecne_chunk *ecne; 3123 int override; 3124 uint32_t cwr_tsn; 3125 3126 cwr_tsn = ntohl(cp->tsn); 3127 3128 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3129 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3130 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3131 continue; 3132 } 3133 if ((override == 0) && (chk->whoTo != net)) { 3134 /* Must be from the right src unless override is set */ 3135 continue; 3136 } 3137 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3138 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3139 /* this covers this ECNE, we can remove it */ 3140 stcb->asoc.ecn_echo_cnt_onq--; 3141 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3142 sctp_next); 3143 if (chk->data) { 3144 sctp_m_freem(chk->data); 3145 chk->data = NULL; 3146 } 3147 stcb->asoc.ctrl_queue_cnt--; 3148 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3149 if (override == 0) { 3150 break; 3151 } 3152 } 3153 } 3154 } 3155 3156 static void 3157 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3158 struct sctp_tcb *stcb, struct sctp_nets *net) 3159 { 3160 struct sctp_association *asoc; 3161 3162 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3163 struct socket *so; 3164 3165 #endif 3166 3167 SCTPDBG(SCTP_DEBUG_INPUT2, 3168 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3169 if (stcb == NULL) 3170 return; 3171 3172 asoc = &stcb->asoc; 3173 /* process according to association state */ 3174 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3175 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3176 SCTPDBG(SCTP_DEBUG_INPUT2, 3177 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3178 SCTP_TCB_UNLOCK(stcb); 3179 return; 3180 } 3181 /* notify upper layer protocol */ 3182 if (stcb->sctp_socket) { 3183 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3184 /* are the queues empty? they should be */ 3185 if (!TAILQ_EMPTY(&asoc->send_queue) || 3186 !TAILQ_EMPTY(&asoc->sent_queue) || 3187 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3188 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3189 } 3190 } 3191 /* stop the timer */ 3192 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3193 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3194 /* free the TCB */ 3195 SCTPDBG(SCTP_DEBUG_INPUT2, 3196 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3197 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3198 so = SCTP_INP_SO(stcb->sctp_ep); 3199 atomic_add_int(&stcb->asoc.refcnt, 1); 3200 SCTP_TCB_UNLOCK(stcb); 3201 SCTP_SOCKET_LOCK(so, 1); 3202 SCTP_TCB_LOCK(stcb); 3203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3204 #endif 3205 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3206 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3207 SCTP_SOCKET_UNLOCK(so, 1); 3208 #endif 3209 return; 3210 } 3211 3212 static int 3213 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3214 struct sctp_nets *net, uint8_t flg) 3215 { 3216 switch (desc->chunk_type) { 3217 case SCTP_DATA: 3218 /* find the tsn to resend (possibly */ 3219 { 3220 uint32_t tsn; 3221 struct sctp_tmit_chunk *tp1; 3222 3223 tsn = ntohl(desc->tsn_ifany); 3224 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3225 if (tp1->rec.data.TSN_seq == tsn) { 3226 /* found it */ 3227 break; 3228 } 3229 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3230 /* not found */ 3231 tp1 = NULL; 3232 break; 3233 } 3234 } 3235 if (tp1 == NULL) { 3236 /* 3237 * Do it the other way , aka without paying 3238 * attention to queue seq order. 3239 */ 3240 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3241 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3242 if (tp1->rec.data.TSN_seq == tsn) { 3243 /* found it */ 3244 break; 3245 } 3246 } 3247 } 3248 if (tp1 == NULL) { 3249 SCTP_STAT_INCR(sctps_pdrptsnnf); 3250 } 3251 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3252 uint8_t *ddp; 3253 3254 if (((flg & SCTP_BADCRC) == 0) && 3255 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3256 return (0); 3257 } 3258 if ((stcb->asoc.peers_rwnd == 0) && 3259 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3260 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3261 return (0); 3262 } 3263 if (stcb->asoc.peers_rwnd == 0 && 3264 (flg & SCTP_FROM_MIDDLE_BOX)) { 3265 SCTP_STAT_INCR(sctps_pdrpdizrw); 3266 return (0); 3267 } 3268 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3269 sizeof(struct sctp_data_chunk)); 3270 { 3271 unsigned int iii; 3272 3273 for (iii = 0; iii < sizeof(desc->data_bytes); 3274 iii++) { 3275 if (ddp[iii] != desc->data_bytes[iii]) { 3276 SCTP_STAT_INCR(sctps_pdrpbadd); 3277 return (-1); 3278 } 3279 } 3280 } 3281 3282 if (tp1->do_rtt) { 3283 /* 3284 * this guy had a RTO calculation 3285 * pending on it, cancel it 3286 */ 3287 if (tp1->whoTo->rto_needed == 0) { 3288 tp1->whoTo->rto_needed = 1; 3289 } 3290 tp1->do_rtt = 0; 3291 } 3292 SCTP_STAT_INCR(sctps_pdrpmark); 3293 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3294 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3295 /* 3296 * mark it as if we were doing a FR, since 3297 * we will be getting gap ack reports behind 3298 * the info from the router. 3299 */ 3300 tp1->rec.data.doing_fast_retransmit = 1; 3301 /* 3302 * mark the tsn with what sequences can 3303 * cause a new FR. 3304 */ 3305 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3306 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3307 } else { 3308 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3309 } 3310 3311 /* restart the timer */ 3312 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3313 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3314 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3315 stcb, tp1->whoTo); 3316 3317 /* fix counts and things */ 3318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3319 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3320 tp1->whoTo->flight_size, 3321 tp1->book_size, 3322 (uintptr_t) stcb, 3323 tp1->rec.data.TSN_seq); 3324 } 3325 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3326 sctp_flight_size_decrease(tp1); 3327 sctp_total_flight_decrease(stcb, tp1); 3328 } 3329 tp1->sent = SCTP_DATAGRAM_RESEND; 3330 } { 3331 /* audit code */ 3332 unsigned int audit; 3333 3334 audit = 0; 3335 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3336 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3337 audit++; 3338 } 3339 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3340 sctp_next) { 3341 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3342 audit++; 3343 } 3344 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3345 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3346 audit, stcb->asoc.sent_queue_retran_cnt); 3347 #ifndef SCTP_AUDITING_ENABLED 3348 stcb->asoc.sent_queue_retran_cnt = audit; 3349 #endif 3350 } 3351 } 3352 } 3353 break; 3354 case SCTP_ASCONF: 3355 { 3356 struct sctp_tmit_chunk *asconf; 3357 3358 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3359 sctp_next) { 3360 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3361 break; 3362 } 3363 } 3364 if (asconf) { 3365 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3366 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3367 asconf->sent = SCTP_DATAGRAM_RESEND; 3368 asconf->snd_count--; 3369 } 3370 } 3371 break; 3372 case SCTP_INITIATION: 3373 /* resend the INIT */ 3374 stcb->asoc.dropped_special_cnt++; 3375 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3376 /* 3377 * If we can get it in, in a few attempts we do 3378 * this, otherwise we let the timer fire. 3379 */ 3380 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3381 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3382 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3383 } 3384 break; 3385 case SCTP_SELECTIVE_ACK: 3386 case SCTP_NR_SELECTIVE_ACK: 3387 /* resend the sack */ 3388 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3389 break; 3390 case SCTP_HEARTBEAT_REQUEST: 3391 /* resend a demand HB */ 3392 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3393 /* 3394 * Only retransmit if we KNOW we wont destroy the 3395 * tcb 3396 */ 3397 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3398 } 3399 break; 3400 case SCTP_SHUTDOWN: 3401 sctp_send_shutdown(stcb, net); 3402 break; 3403 case SCTP_SHUTDOWN_ACK: 3404 sctp_send_shutdown_ack(stcb, net); 3405 break; 3406 case SCTP_COOKIE_ECHO: 3407 { 3408 struct sctp_tmit_chunk *cookie; 3409 3410 cookie = NULL; 3411 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3412 sctp_next) { 3413 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3414 break; 3415 } 3416 } 3417 if (cookie) { 3418 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3419 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3420 cookie->sent = SCTP_DATAGRAM_RESEND; 3421 sctp_stop_all_cookie_timers(stcb); 3422 } 3423 } 3424 break; 3425 case SCTP_COOKIE_ACK: 3426 sctp_send_cookie_ack(stcb); 3427 break; 3428 case SCTP_ASCONF_ACK: 3429 /* resend last asconf ack */ 3430 sctp_send_asconf_ack(stcb); 3431 break; 3432 case SCTP_FORWARD_CUM_TSN: 3433 send_forward_tsn(stcb, &stcb->asoc); 3434 break; 3435 /* can't do anything with these */ 3436 case SCTP_PACKET_DROPPED: 3437 case SCTP_INITIATION_ACK: /* this should not happen */ 3438 case SCTP_HEARTBEAT_ACK: 3439 case SCTP_ABORT_ASSOCIATION: 3440 case SCTP_OPERATION_ERROR: 3441 case SCTP_SHUTDOWN_COMPLETE: 3442 case SCTP_ECN_ECHO: 3443 case SCTP_ECN_CWR: 3444 default: 3445 break; 3446 } 3447 return (0); 3448 } 3449 3450 void 3451 sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3452 { 3453 int i; 3454 uint16_t temp; 3455 3456 /* 3457 * We set things to 0xffff since this is the last delivered sequence 3458 * and we will be sending in 0 after the reset. 3459 */ 3460 3461 if (number_entries) { 3462 for (i = 0; i < number_entries; i++) { 3463 temp = ntohs(list[i]); 3464 if (temp >= stcb->asoc.streamincnt) { 3465 continue; 3466 } 3467 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3468 } 3469 } else { 3470 list = NULL; 3471 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3472 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3473 } 3474 } 3475 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3476 } 3477 3478 static void 3479 sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3480 { 3481 int i; 3482 3483 if (number_entries == 0) { 3484 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3485 stcb->asoc.strmout[i].next_sequence_sent = 0; 3486 } 3487 } else if (number_entries) { 3488 for (i = 0; i < number_entries; i++) { 3489 uint16_t temp; 3490 3491 temp = ntohs(list[i]); 3492 if (temp >= stcb->asoc.streamoutcnt) { 3493 /* no such stream */ 3494 continue; 3495 } 3496 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3497 } 3498 } 3499 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3500 } 3501 3502 3503 struct sctp_stream_reset_out_request * 3504 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3505 { 3506 struct sctp_association *asoc; 3507 struct sctp_stream_reset_out_req *req; 3508 struct sctp_stream_reset_out_request *r; 3509 struct sctp_tmit_chunk *chk; 3510 int len, clen; 3511 3512 asoc = &stcb->asoc; 3513 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3514 asoc->stream_reset_outstanding = 0; 3515 return (NULL); 3516 } 3517 if (stcb->asoc.str_reset == NULL) { 3518 asoc->stream_reset_outstanding = 0; 3519 return (NULL); 3520 } 3521 chk = stcb->asoc.str_reset; 3522 if (chk->data == NULL) { 3523 return (NULL); 3524 } 3525 if (bchk) { 3526 /* he wants a copy of the chk pointer */ 3527 *bchk = chk; 3528 } 3529 clen = chk->send_size; 3530 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3531 r = &req->sr_req; 3532 if (ntohl(r->request_seq) == seq) { 3533 /* found it */ 3534 return (r); 3535 } 3536 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3537 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3538 /* move to the next one, there can only be a max of two */ 3539 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3540 if (ntohl(r->request_seq) == seq) { 3541 return (r); 3542 } 3543 } 3544 /* that seq is not here */ 3545 return (NULL); 3546 } 3547 3548 static void 3549 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3550 { 3551 struct sctp_association *asoc; 3552 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3553 3554 if (stcb->asoc.str_reset == NULL) { 3555 return; 3556 } 3557 asoc = &stcb->asoc; 3558 3559 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3560 TAILQ_REMOVE(&asoc->control_send_queue, 3561 chk, 3562 sctp_next); 3563 if (chk->data) { 3564 sctp_m_freem(chk->data); 3565 chk->data = NULL; 3566 } 3567 asoc->ctrl_queue_cnt--; 3568 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3569 /* sa_ignore NO_NULL_CHK */ 3570 stcb->asoc.str_reset = NULL; 3571 } 3572 3573 3574 static int 3575 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3576 uint32_t seq, uint32_t action, 3577 struct sctp_stream_reset_response *respin) 3578 { 3579 uint16_t type; 3580 int lparm_len; 3581 struct sctp_association *asoc = &stcb->asoc; 3582 struct sctp_tmit_chunk *chk; 3583 struct sctp_stream_reset_out_request *srparam; 3584 int number_entries; 3585 3586 if (asoc->stream_reset_outstanding == 0) { 3587 /* duplicate */ 3588 return (0); 3589 } 3590 if (seq == stcb->asoc.str_reset_seq_out) { 3591 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3592 if (srparam) { 3593 stcb->asoc.str_reset_seq_out++; 3594 type = ntohs(srparam->ph.param_type); 3595 lparm_len = ntohs(srparam->ph.param_length); 3596 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3597 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3598 asoc->stream_reset_out_is_outstanding = 0; 3599 if (asoc->stream_reset_outstanding) 3600 asoc->stream_reset_outstanding--; 3601 if (action == SCTP_STREAM_RESET_PERFORMED) { 3602 /* do it */ 3603 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3604 } else { 3605 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3606 } 3607 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3608 /* Answered my request */ 3609 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3610 if (asoc->stream_reset_outstanding) 3611 asoc->stream_reset_outstanding--; 3612 if (action != SCTP_STREAM_RESET_PERFORMED) { 3613 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3614 } 3615 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3616 /* Ok we now may have more streams */ 3617 if (asoc->stream_reset_outstanding) 3618 asoc->stream_reset_outstanding--; 3619 if (action == SCTP_STREAM_RESET_PERFORMED) { 3620 /* Put the new streams into effect */ 3621 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3622 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3623 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3624 } else { 3625 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3626 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3627 } 3628 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3629 /** 3630 * a) Adopt the new in tsn. 3631 * b) reset the map 3632 * c) Adopt the new out-tsn 3633 */ 3634 struct sctp_stream_reset_response_tsn *resp; 3635 struct sctp_forward_tsn_chunk fwdtsn; 3636 int abort_flag = 0; 3637 3638 if (respin == NULL) { 3639 /* huh ? */ 3640 return (0); 3641 } 3642 if (action == SCTP_STREAM_RESET_PERFORMED) { 3643 resp = (struct sctp_stream_reset_response_tsn *)respin; 3644 asoc->stream_reset_outstanding--; 3645 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3646 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3647 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3648 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3649 if (abort_flag) { 3650 return (1); 3651 } 3652 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3653 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3654 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3655 } 3656 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3657 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3658 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3659 3660 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3661 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3662 3663 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3664 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3665 3666 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3667 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3668 3669 } 3670 } 3671 /* get rid of the request and get the request flags */ 3672 if (asoc->stream_reset_outstanding == 0) { 3673 sctp_clean_up_stream_reset(stcb); 3674 } 3675 } 3676 } 3677 return (0); 3678 } 3679 3680 static void 3681 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3682 struct sctp_tmit_chunk *chk, 3683 struct sctp_stream_reset_in_request *req, int trunc) 3684 { 3685 uint32_t seq; 3686 int len, i; 3687 int number_entries; 3688 uint16_t temp; 3689 3690 /* 3691 * peer wants me to send a str-reset to him for my outgoing seq's if 3692 * seq_in is right. 3693 */ 3694 struct sctp_association *asoc = &stcb->asoc; 3695 3696 seq = ntohl(req->request_seq); 3697 if (asoc->str_reset_seq_in == seq) { 3698 if (trunc) { 3699 /* Can't do it, since they exceeded our buffer size */ 3700 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3701 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3702 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3703 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3704 len = ntohs(req->ph.param_length); 3705 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3706 for (i = 0; i < number_entries; i++) { 3707 temp = ntohs(req->list_of_streams[i]); 3708 req->list_of_streams[i] = temp; 3709 } 3710 /* move the reset action back one */ 3711 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3712 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3713 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3714 asoc->str_reset_seq_out, 3715 seq, (asoc->sending_seq - 1)); 3716 asoc->stream_reset_out_is_outstanding = 1; 3717 asoc->str_reset = chk; 3718 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3719 stcb->asoc.stream_reset_outstanding++; 3720 } else { 3721 /* Can't do it, since we have sent one out */ 3722 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3723 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3724 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3725 } 3726 asoc->str_reset_seq_in++; 3727 } else if (asoc->str_reset_seq_in - 1 == seq) { 3728 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3729 } else if (asoc->str_reset_seq_in - 2 == seq) { 3730 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3731 } else { 3732 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3733 } 3734 } 3735 3736 static int 3737 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3738 struct sctp_tmit_chunk *chk, 3739 struct sctp_stream_reset_tsn_request *req) 3740 { 3741 /* reset all in and out and update the tsn */ 3742 /* 3743 * A) reset my str-seq's on in and out. B) Select a receive next, 3744 * and set cum-ack to it. Also process this selected number as a 3745 * fwd-tsn as well. C) set in the response my next sending seq. 3746 */ 3747 struct sctp_forward_tsn_chunk fwdtsn; 3748 struct sctp_association *asoc = &stcb->asoc; 3749 int abort_flag = 0; 3750 uint32_t seq; 3751 3752 seq = ntohl(req->request_seq); 3753 if (asoc->str_reset_seq_in == seq) { 3754 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3755 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3756 fwdtsn.ch.chunk_flags = 0; 3757 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3758 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3759 if (abort_flag) { 3760 return (1); 3761 } 3762 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3763 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3764 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3765 } 3766 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3767 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3768 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3769 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3770 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3771 atomic_add_int(&stcb->asoc.sending_seq, 1); 3772 /* save off historical data for retrans */ 3773 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3774 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3775 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3776 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3777 3778 sctp_add_stream_reset_result_tsn(chk, 3779 ntohl(req->request_seq), 3780 SCTP_STREAM_RESET_PERFORMED, 3781 stcb->asoc.sending_seq, 3782 stcb->asoc.mapping_array_base_tsn); 3783 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3784 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3785 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3786 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3787 3788 asoc->str_reset_seq_in++; 3789 } else if (asoc->str_reset_seq_in - 1 == seq) { 3790 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3791 stcb->asoc.last_sending_seq[0], 3792 stcb->asoc.last_base_tsnsent[0] 3793 ); 3794 } else if (asoc->str_reset_seq_in - 2 == seq) { 3795 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3796 stcb->asoc.last_sending_seq[1], 3797 stcb->asoc.last_base_tsnsent[1] 3798 ); 3799 } else { 3800 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3801 } 3802 return (0); 3803 } 3804 3805 static void 3806 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3807 struct sctp_tmit_chunk *chk, 3808 struct sctp_stream_reset_out_request *req, int trunc) 3809 { 3810 uint32_t seq, tsn; 3811 int number_entries, len; 3812 struct sctp_association *asoc = &stcb->asoc; 3813 3814 seq = ntohl(req->request_seq); 3815 3816 /* now if its not a duplicate we process it */ 3817 if (asoc->str_reset_seq_in == seq) { 3818 len = ntohs(req->ph.param_length); 3819 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3820 /* 3821 * the sender is resetting, handle the list issue.. we must 3822 * a) verify if we can do the reset, if so no problem b) If 3823 * we can't do the reset we must copy the request. c) queue 3824 * it, and setup the data in processor to trigger it off 3825 * when needed and dequeue all the queued data. 3826 */ 3827 tsn = ntohl(req->send_reset_at_tsn); 3828 3829 /* move the reset action back one */ 3830 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3831 if (trunc) { 3832 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3833 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3834 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3835 /* we can do it now */ 3836 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3837 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3838 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3839 } else { 3840 /* 3841 * we must queue it up and thus wait for the TSN's 3842 * to arrive that are at or before tsn 3843 */ 3844 struct sctp_stream_reset_list *liste; 3845 int siz; 3846 3847 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3848 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3849 siz, SCTP_M_STRESET); 3850 if (liste == NULL) { 3851 /* gak out of memory */ 3852 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3853 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3854 return; 3855 } 3856 liste->tsn = tsn; 3857 liste->number_entries = number_entries; 3858 memcpy(&liste->req, req, 3859 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3860 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3861 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3862 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3863 } 3864 asoc->str_reset_seq_in++; 3865 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3866 /* 3867 * one seq back, just echo back last action since my 3868 * response was lost. 3869 */ 3870 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3871 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3872 /* 3873 * two 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[1]); 3877 } else { 3878 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3879 } 3880 } 3881 3882 static void 3883 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3884 struct sctp_stream_reset_add_strm *str_add) 3885 { 3886 /* 3887 * Peer is requesting to add more streams. If its within our 3888 * max-streams we will allow it. 3889 */ 3890 uint16_t num_stream, i; 3891 uint32_t seq; 3892 struct sctp_association *asoc = &stcb->asoc; 3893 struct sctp_queued_to_read *ctl, *nctl; 3894 3895 /* Get the number. */ 3896 seq = ntohl(str_add->request_seq); 3897 num_stream = ntohs(str_add->number_of_streams); 3898 /* Now what would be the new total? */ 3899 if (asoc->str_reset_seq_in == seq) { 3900 num_stream += stcb->asoc.streamincnt; 3901 if (num_stream > stcb->asoc.max_inbound_streams) { 3902 /* We must reject it they ask for to many */ 3903 denied: 3904 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3905 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3906 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3907 } else { 3908 /* Ok, we can do that :-) */ 3909 struct sctp_stream_in *oldstrm; 3910 3911 /* save off the old */ 3912 oldstrm = stcb->asoc.strmin; 3913 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3914 (num_stream * sizeof(struct sctp_stream_in)), 3915 SCTP_M_STRMI); 3916 if (stcb->asoc.strmin == NULL) { 3917 stcb->asoc.strmin = oldstrm; 3918 goto denied; 3919 } 3920 /* copy off the old data */ 3921 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3922 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3923 stcb->asoc.strmin[i].stream_no = i; 3924 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3925 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3926 /* now anything on those queues? */ 3927 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3928 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3929 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3930 } 3931 } 3932 /* Init the new streams */ 3933 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3934 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3935 stcb->asoc.strmin[i].stream_no = i; 3936 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3937 stcb->asoc.strmin[i].delivery_started = 0; 3938 } 3939 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3940 /* update the size */ 3941 stcb->asoc.streamincnt = num_stream; 3942 /* Send the ack */ 3943 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3944 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3945 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3946 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3947 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3948 } 3949 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3950 /* 3951 * one seq back, just echo back last action since my 3952 * response was lost. 3953 */ 3954 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3955 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3956 /* 3957 * two 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[1]); 3961 } else { 3962 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3963 3964 } 3965 } 3966 3967 #ifdef __GNUC__ 3968 __attribute__((noinline)) 3969 #endif 3970 static int 3971 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3972 struct sctp_stream_reset_out_req *sr_req) 3973 { 3974 int chk_length, param_len, ptype; 3975 struct sctp_paramhdr pstore; 3976 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3977 3978 uint32_t seq; 3979 int num_req = 0; 3980 int trunc = 0; 3981 struct sctp_tmit_chunk *chk; 3982 struct sctp_chunkhdr *ch; 3983 struct sctp_paramhdr *ph; 3984 int ret_code = 0; 3985 int num_param = 0; 3986 3987 /* now it may be a reset or a reset-response */ 3988 chk_length = ntohs(sr_req->ch.chunk_length); 3989 3990 /* setup for adding the response */ 3991 sctp_alloc_a_chunk(stcb, chk); 3992 if (chk == NULL) { 3993 return (ret_code); 3994 } 3995 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3996 chk->rec.chunk_id.can_take_data = 0; 3997 chk->asoc = &stcb->asoc; 3998 chk->no_fr_allowed = 0; 3999 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4000 chk->book_size_scale = 0; 4001 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4002 if (chk->data == NULL) { 4003 strres_nochunk: 4004 if (chk->data) { 4005 sctp_m_freem(chk->data); 4006 chk->data = NULL; 4007 } 4008 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4009 return (ret_code); 4010 } 4011 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4012 4013 /* setup chunk parameters */ 4014 chk->sent = SCTP_DATAGRAM_UNSENT; 4015 chk->snd_count = 0; 4016 chk->whoTo = NULL; 4017 4018 ch = mtod(chk->data, struct sctp_chunkhdr *); 4019 ch->chunk_type = SCTP_STREAM_RESET; 4020 ch->chunk_flags = 0; 4021 ch->chunk_length = htons(chk->send_size); 4022 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4023 offset += sizeof(struct sctp_chunkhdr); 4024 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4025 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4026 if (ph == NULL) 4027 break; 4028 param_len = ntohs(ph->param_length); 4029 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4030 /* bad param */ 4031 break; 4032 } 4033 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4034 (uint8_t *) & cstore); 4035 ptype = ntohs(ph->param_type); 4036 num_param++; 4037 if (param_len > (int)sizeof(cstore)) { 4038 trunc = 1; 4039 } else { 4040 trunc = 0; 4041 } 4042 4043 if (num_param > SCTP_MAX_RESET_PARAMS) { 4044 /* hit the max of parameters already sorry.. */ 4045 break; 4046 } 4047 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4048 struct sctp_stream_reset_out_request *req_out; 4049 4050 req_out = (struct sctp_stream_reset_out_request *)ph; 4051 num_req++; 4052 if (stcb->asoc.stream_reset_outstanding) { 4053 seq = ntohl(req_out->response_seq); 4054 if (seq == stcb->asoc.str_reset_seq_out) { 4055 /* implicit ack */ 4056 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 4057 } 4058 } 4059 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4060 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 4061 struct sctp_stream_reset_add_strm *str_add; 4062 4063 str_add = (struct sctp_stream_reset_add_strm *)ph; 4064 num_req++; 4065 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4066 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4067 struct sctp_stream_reset_in_request *req_in; 4068 4069 num_req++; 4070 4071 req_in = (struct sctp_stream_reset_in_request *)ph; 4072 4073 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4074 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4075 struct sctp_stream_reset_tsn_request *req_tsn; 4076 4077 num_req++; 4078 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4079 4080 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4081 ret_code = 1; 4082 goto strres_nochunk; 4083 } 4084 /* no more */ 4085 break; 4086 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4087 struct sctp_stream_reset_response *resp; 4088 uint32_t result; 4089 4090 resp = (struct sctp_stream_reset_response *)ph; 4091 seq = ntohl(resp->response_seq); 4092 result = ntohl(resp->result); 4093 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4094 ret_code = 1; 4095 goto strres_nochunk; 4096 } 4097 } else { 4098 break; 4099 } 4100 offset += SCTP_SIZE32(param_len); 4101 chk_length -= SCTP_SIZE32(param_len); 4102 } 4103 if (num_req == 0) { 4104 /* we have no response free the stuff */ 4105 goto strres_nochunk; 4106 } 4107 /* ok we have a chunk to link in */ 4108 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4109 chk, 4110 sctp_next); 4111 stcb->asoc.ctrl_queue_cnt++; 4112 return (ret_code); 4113 } 4114 4115 /* 4116 * Handle a router or endpoints report of a packet loss, there are two ways 4117 * to handle this, either we get the whole packet and must disect it 4118 * ourselves (possibly with truncation and or corruption) or it is a summary 4119 * from a middle box that did the disectting for us. 4120 */ 4121 static void 4122 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4123 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4124 { 4125 uint32_t bottle_bw, on_queue; 4126 uint16_t trunc_len; 4127 unsigned int chlen; 4128 unsigned int at; 4129 struct sctp_chunk_desc desc; 4130 struct sctp_chunkhdr *ch; 4131 4132 chlen = ntohs(cp->ch.chunk_length); 4133 chlen -= sizeof(struct sctp_pktdrop_chunk); 4134 /* XXX possible chlen underflow */ 4135 if (chlen == 0) { 4136 ch = NULL; 4137 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4138 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4139 } else { 4140 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4141 chlen -= sizeof(struct sctphdr); 4142 /* XXX possible chlen underflow */ 4143 memset(&desc, 0, sizeof(desc)); 4144 } 4145 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4146 if (trunc_len > limit) { 4147 trunc_len = limit; 4148 } 4149 /* now the chunks themselves */ 4150 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4151 desc.chunk_type = ch->chunk_type; 4152 /* get amount we need to move */ 4153 at = ntohs(ch->chunk_length); 4154 if (at < sizeof(struct sctp_chunkhdr)) { 4155 /* corrupt chunk, maybe at the end? */ 4156 SCTP_STAT_INCR(sctps_pdrpcrupt); 4157 break; 4158 } 4159 if (trunc_len == 0) { 4160 /* we are supposed to have all of it */ 4161 if (at > chlen) { 4162 /* corrupt skip it */ 4163 SCTP_STAT_INCR(sctps_pdrpcrupt); 4164 break; 4165 } 4166 } else { 4167 /* is there enough of it left ? */ 4168 if (desc.chunk_type == SCTP_DATA) { 4169 if (chlen < (sizeof(struct sctp_data_chunk) + 4170 sizeof(desc.data_bytes))) { 4171 break; 4172 } 4173 } else { 4174 if (chlen < sizeof(struct sctp_chunkhdr)) { 4175 break; 4176 } 4177 } 4178 } 4179 if (desc.chunk_type == SCTP_DATA) { 4180 /* can we get out the tsn? */ 4181 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4182 SCTP_STAT_INCR(sctps_pdrpmbda); 4183 4184 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4185 /* yep */ 4186 struct sctp_data_chunk *dcp; 4187 uint8_t *ddp; 4188 unsigned int iii; 4189 4190 dcp = (struct sctp_data_chunk *)ch; 4191 ddp = (uint8_t *) (dcp + 1); 4192 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4193 desc.data_bytes[iii] = ddp[iii]; 4194 } 4195 desc.tsn_ifany = dcp->dp.tsn; 4196 } else { 4197 /* nope we are done. */ 4198 SCTP_STAT_INCR(sctps_pdrpnedat); 4199 break; 4200 } 4201 } else { 4202 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4203 SCTP_STAT_INCR(sctps_pdrpmbct); 4204 } 4205 4206 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4207 SCTP_STAT_INCR(sctps_pdrppdbrk); 4208 break; 4209 } 4210 if (SCTP_SIZE32(at) > chlen) { 4211 break; 4212 } 4213 chlen -= SCTP_SIZE32(at); 4214 if (chlen < sizeof(struct sctp_chunkhdr)) { 4215 /* done, none left */ 4216 break; 4217 } 4218 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4219 } 4220 /* Now update any rwnd --- possibly */ 4221 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4222 /* From a peer, we get a rwnd report */ 4223 uint32_t a_rwnd; 4224 4225 SCTP_STAT_INCR(sctps_pdrpfehos); 4226 4227 bottle_bw = ntohl(cp->bottle_bw); 4228 on_queue = ntohl(cp->current_onq); 4229 if (bottle_bw && on_queue) { 4230 /* a rwnd report is in here */ 4231 if (bottle_bw > on_queue) 4232 a_rwnd = bottle_bw - on_queue; 4233 else 4234 a_rwnd = 0; 4235 4236 if (a_rwnd == 0) 4237 stcb->asoc.peers_rwnd = 0; 4238 else { 4239 if (a_rwnd > stcb->asoc.total_flight) { 4240 stcb->asoc.peers_rwnd = 4241 a_rwnd - stcb->asoc.total_flight; 4242 } else { 4243 stcb->asoc.peers_rwnd = 0; 4244 } 4245 if (stcb->asoc.peers_rwnd < 4246 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4247 /* SWS sender side engages */ 4248 stcb->asoc.peers_rwnd = 0; 4249 } 4250 } 4251 } 4252 } else { 4253 SCTP_STAT_INCR(sctps_pdrpfmbox); 4254 } 4255 4256 /* now middle boxes in sat networks get a cwnd bump */ 4257 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4258 (stcb->asoc.sat_t3_loss_recovery == 0) && 4259 (stcb->asoc.sat_network)) { 4260 /* 4261 * This is debateable but for sat networks it makes sense 4262 * Note if a T3 timer has went off, we will prohibit any 4263 * changes to cwnd until we exit the t3 loss recovery. 4264 */ 4265 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4266 net, cp, &bottle_bw, &on_queue); 4267 } 4268 } 4269 4270 /* 4271 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4272 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4273 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4274 * length of the complete packet outputs: - length: modified to remaining 4275 * length after control processing - netp: modified to new sctp_nets after 4276 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4277 * bad packet,...) otherwise return the tcb for this packet 4278 */ 4279 #ifdef __GNUC__ 4280 __attribute__((noinline)) 4281 #endif 4282 static struct sctp_tcb * 4283 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4284 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4285 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4286 uint32_t vrf_id, uint16_t port) 4287 { 4288 struct sctp_association *asoc; 4289 uint32_t vtag_in; 4290 int num_chunks = 0; /* number of control chunks processed */ 4291 uint32_t chk_length; 4292 int ret; 4293 int abort_no_unlock = 0; 4294 int ecne_seen = 0; 4295 4296 /* 4297 * How big should this be, and should it be alloc'd? Lets try the 4298 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4299 * until we get into jumbo grams and such.. 4300 */ 4301 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4302 struct sctp_tcb *locked_tcb = stcb; 4303 int got_auth = 0; 4304 uint32_t auth_offset = 0, auth_len = 0; 4305 int auth_skipped = 0; 4306 int asconf_cnt = 0; 4307 4308 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4309 struct socket *so; 4310 4311 #endif 4312 4313 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4314 iphlen, *offset, length, stcb); 4315 4316 /* validate chunk header length... */ 4317 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4318 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4319 ntohs(ch->chunk_length)); 4320 if (locked_tcb) { 4321 SCTP_TCB_UNLOCK(locked_tcb); 4322 } 4323 return (NULL); 4324 } 4325 /* 4326 * validate the verification tag 4327 */ 4328 vtag_in = ntohl(sh->v_tag); 4329 4330 if (locked_tcb) { 4331 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4332 } 4333 if (ch->chunk_type == SCTP_INITIATION) { 4334 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4335 ntohs(ch->chunk_length), vtag_in); 4336 if (vtag_in != 0) { 4337 /* protocol error- silently discard... */ 4338 SCTP_STAT_INCR(sctps_badvtag); 4339 if (locked_tcb) { 4340 SCTP_TCB_UNLOCK(locked_tcb); 4341 } 4342 return (NULL); 4343 } 4344 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4345 /* 4346 * If there is no stcb, skip the AUTH chunk and process 4347 * later after a stcb is found (to validate the lookup was 4348 * valid. 4349 */ 4350 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4351 (stcb == NULL) && 4352 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4353 /* save this chunk for later processing */ 4354 auth_skipped = 1; 4355 auth_offset = *offset; 4356 auth_len = ntohs(ch->chunk_length); 4357 4358 /* (temporarily) move past this chunk */ 4359 *offset += SCTP_SIZE32(auth_len); 4360 if (*offset >= length) { 4361 /* no more data left in the mbuf chain */ 4362 *offset = length; 4363 if (locked_tcb) { 4364 SCTP_TCB_UNLOCK(locked_tcb); 4365 } 4366 return (NULL); 4367 } 4368 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4369 sizeof(struct sctp_chunkhdr), chunk_buf); 4370 } 4371 if (ch == NULL) { 4372 /* Help */ 4373 *offset = length; 4374 if (locked_tcb) { 4375 SCTP_TCB_UNLOCK(locked_tcb); 4376 } 4377 return (NULL); 4378 } 4379 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4380 goto process_control_chunks; 4381 } 4382 /* 4383 * first check if it's an ASCONF with an unknown src addr we 4384 * need to look inside to find the association 4385 */ 4386 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4387 struct sctp_chunkhdr *asconf_ch = ch; 4388 uint32_t asconf_offset = 0, asconf_len = 0; 4389 4390 /* inp's refcount may be reduced */ 4391 SCTP_INP_INCR_REF(inp); 4392 4393 asconf_offset = *offset; 4394 do { 4395 asconf_len = ntohs(asconf_ch->chunk_length); 4396 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4397 break; 4398 stcb = sctp_findassociation_ep_asconf(m, 4399 *offset, sh, &inp, netp, vrf_id); 4400 if (stcb != NULL) 4401 break; 4402 asconf_offset += SCTP_SIZE32(asconf_len); 4403 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4404 sizeof(struct sctp_chunkhdr), chunk_buf); 4405 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4406 if (stcb == NULL) { 4407 /* 4408 * reduce inp's refcount if not reduced in 4409 * sctp_findassociation_ep_asconf(). 4410 */ 4411 SCTP_INP_DECR_REF(inp); 4412 } else { 4413 locked_tcb = stcb; 4414 } 4415 4416 /* now go back and verify any auth chunk to be sure */ 4417 if (auth_skipped && (stcb != NULL)) { 4418 struct sctp_auth_chunk *auth; 4419 4420 auth = (struct sctp_auth_chunk *) 4421 sctp_m_getptr(m, auth_offset, 4422 auth_len, chunk_buf); 4423 got_auth = 1; 4424 auth_skipped = 0; 4425 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4426 auth_offset)) { 4427 /* auth HMAC failed so dump it */ 4428 *offset = length; 4429 if (locked_tcb) { 4430 SCTP_TCB_UNLOCK(locked_tcb); 4431 } 4432 return (NULL); 4433 } else { 4434 /* remaining chunks are HMAC checked */ 4435 stcb->asoc.authenticated = 1; 4436 } 4437 } 4438 } 4439 if (stcb == NULL) { 4440 /* no association, so it's out of the blue... */ 4441 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4442 vrf_id, port); 4443 *offset = length; 4444 if (locked_tcb) { 4445 SCTP_TCB_UNLOCK(locked_tcb); 4446 } 4447 return (NULL); 4448 } 4449 asoc = &stcb->asoc; 4450 /* ABORT and SHUTDOWN can use either v_tag... */ 4451 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4452 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4453 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4454 if ((vtag_in == asoc->my_vtag) || 4455 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4456 (vtag_in == asoc->peer_vtag))) { 4457 /* this is valid */ 4458 } else { 4459 /* drop this packet... */ 4460 SCTP_STAT_INCR(sctps_badvtag); 4461 if (locked_tcb) { 4462 SCTP_TCB_UNLOCK(locked_tcb); 4463 } 4464 return (NULL); 4465 } 4466 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4467 if (vtag_in != asoc->my_vtag) { 4468 /* 4469 * this could be a stale SHUTDOWN-ACK or the 4470 * peer never got the SHUTDOWN-COMPLETE and 4471 * is still hung; we have started a new asoc 4472 * but it won't complete until the shutdown 4473 * is completed 4474 */ 4475 if (locked_tcb) { 4476 SCTP_TCB_UNLOCK(locked_tcb); 4477 } 4478 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4479 NULL, vrf_id, port); 4480 return (NULL); 4481 } 4482 } else { 4483 /* for all other chunks, vtag must match */ 4484 if (vtag_in != asoc->my_vtag) { 4485 /* invalid vtag... */ 4486 SCTPDBG(SCTP_DEBUG_INPUT3, 4487 "invalid vtag: %xh, expect %xh\n", 4488 vtag_in, asoc->my_vtag); 4489 SCTP_STAT_INCR(sctps_badvtag); 4490 if (locked_tcb) { 4491 SCTP_TCB_UNLOCK(locked_tcb); 4492 } 4493 *offset = length; 4494 return (NULL); 4495 } 4496 } 4497 } /* end if !SCTP_COOKIE_ECHO */ 4498 /* 4499 * process all control chunks... 4500 */ 4501 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4502 /* EY */ 4503 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4504 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4505 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4506 /* implied cookie-ack.. we must have lost the ack */ 4507 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4508 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4509 stcb->asoc.overall_error_count, 4510 0, 4511 SCTP_FROM_SCTP_INPUT, 4512 __LINE__); 4513 } 4514 stcb->asoc.overall_error_count = 0; 4515 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4516 *netp); 4517 } 4518 process_control_chunks: 4519 while (IS_SCTP_CONTROL(ch)) { 4520 /* validate chunk length */ 4521 chk_length = ntohs(ch->chunk_length); 4522 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4523 ch->chunk_type, chk_length); 4524 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4525 if (chk_length < sizeof(*ch) || 4526 (*offset + (int)chk_length) > length) { 4527 *offset = length; 4528 if (locked_tcb) { 4529 SCTP_TCB_UNLOCK(locked_tcb); 4530 } 4531 return (NULL); 4532 } 4533 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4534 /* 4535 * INIT-ACK only gets the init ack "header" portion only 4536 * because we don't have to process the peer's COOKIE. All 4537 * others get a complete chunk. 4538 */ 4539 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4540 (ch->chunk_type == SCTP_INITIATION)) { 4541 /* get an init-ack chunk */ 4542 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4543 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4544 if (ch == NULL) { 4545 *offset = length; 4546 if (locked_tcb) { 4547 SCTP_TCB_UNLOCK(locked_tcb); 4548 } 4549 return (NULL); 4550 } 4551 } else { 4552 /* For cookies and all other chunks. */ 4553 if (chk_length > sizeof(chunk_buf)) { 4554 /* 4555 * use just the size of the chunk buffer so 4556 * the front part of our chunks fit in 4557 * contiguous space up to the chunk buffer 4558 * size (508 bytes). For chunks that need to 4559 * get more than that they must use the 4560 * sctp_m_getptr() function or other means 4561 * (e.g. know how to parse mbuf chains). 4562 * Cookies do this already. 4563 */ 4564 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4565 (sizeof(chunk_buf) - 4), 4566 chunk_buf); 4567 if (ch == NULL) { 4568 *offset = length; 4569 if (locked_tcb) { 4570 SCTP_TCB_UNLOCK(locked_tcb); 4571 } 4572 return (NULL); 4573 } 4574 } else { 4575 /* We can fit it all */ 4576 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4577 chk_length, chunk_buf); 4578 if (ch == NULL) { 4579 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4580 *offset = length; 4581 if (locked_tcb) { 4582 SCTP_TCB_UNLOCK(locked_tcb); 4583 } 4584 return (NULL); 4585 } 4586 } 4587 } 4588 num_chunks++; 4589 /* Save off the last place we got a control from */ 4590 if (stcb != NULL) { 4591 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4592 /* 4593 * allow last_control to be NULL if 4594 * ASCONF... ASCONF processing will find the 4595 * right net later 4596 */ 4597 if ((netp != NULL) && (*netp != NULL)) 4598 stcb->asoc.last_control_chunk_from = *netp; 4599 } 4600 } 4601 #ifdef SCTP_AUDITING_ENABLED 4602 sctp_audit_log(0xB0, ch->chunk_type); 4603 #endif 4604 4605 /* check to see if this chunk required auth, but isn't */ 4606 if ((stcb != NULL) && 4607 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4608 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4609 !stcb->asoc.authenticated) { 4610 /* "silently" ignore */ 4611 SCTP_STAT_INCR(sctps_recvauthmissing); 4612 goto next_chunk; 4613 } 4614 switch (ch->chunk_type) { 4615 case SCTP_INITIATION: 4616 /* must be first and only chunk */ 4617 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4618 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4619 /* We are not interested anymore? */ 4620 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4621 /* 4622 * collision case where we are 4623 * sending to them too 4624 */ 4625 ; 4626 } else { 4627 if (locked_tcb) { 4628 SCTP_TCB_UNLOCK(locked_tcb); 4629 } 4630 *offset = length; 4631 return (NULL); 4632 } 4633 } 4634 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4635 (num_chunks > 1) || 4636 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4637 *offset = length; 4638 if (locked_tcb) { 4639 SCTP_TCB_UNLOCK(locked_tcb); 4640 } 4641 return (NULL); 4642 } 4643 if ((stcb != NULL) && 4644 (SCTP_GET_STATE(&stcb->asoc) == 4645 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4646 sctp_send_shutdown_ack(stcb, NULL); 4647 *offset = length; 4648 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4649 if (locked_tcb) { 4650 SCTP_TCB_UNLOCK(locked_tcb); 4651 } 4652 return (NULL); 4653 } 4654 if (netp) { 4655 sctp_handle_init(m, iphlen, *offset, sh, 4656 (struct sctp_init_chunk *)ch, inp, 4657 stcb, &abort_no_unlock, vrf_id, port); 4658 } 4659 if (abort_no_unlock) 4660 return (NULL); 4661 4662 *offset = length; 4663 if (locked_tcb) { 4664 SCTP_TCB_UNLOCK(locked_tcb); 4665 } 4666 return (NULL); 4667 break; 4668 case SCTP_PAD_CHUNK: 4669 break; 4670 case SCTP_INITIATION_ACK: 4671 /* must be first and only chunk */ 4672 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4673 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4674 /* We are not interested anymore */ 4675 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4676 ; 4677 } else { 4678 if (locked_tcb != stcb) { 4679 /* Very unlikely */ 4680 SCTP_TCB_UNLOCK(locked_tcb); 4681 } 4682 *offset = length; 4683 if (stcb) { 4684 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4685 so = SCTP_INP_SO(inp); 4686 atomic_add_int(&stcb->asoc.refcnt, 1); 4687 SCTP_TCB_UNLOCK(stcb); 4688 SCTP_SOCKET_LOCK(so, 1); 4689 SCTP_TCB_LOCK(stcb); 4690 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4691 #endif 4692 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4693 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4694 SCTP_SOCKET_UNLOCK(so, 1); 4695 #endif 4696 } 4697 return (NULL); 4698 } 4699 } 4700 if ((num_chunks > 1) || 4701 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4702 *offset = length; 4703 if (locked_tcb) { 4704 SCTP_TCB_UNLOCK(locked_tcb); 4705 } 4706 return (NULL); 4707 } 4708 if ((netp) && (*netp)) { 4709 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4710 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4711 } else { 4712 ret = -1; 4713 } 4714 /* 4715 * Special case, I must call the output routine to 4716 * get the cookie echoed 4717 */ 4718 if (abort_no_unlock) 4719 return (NULL); 4720 4721 if ((stcb) && ret == 0) 4722 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4723 *offset = length; 4724 if (locked_tcb) { 4725 SCTP_TCB_UNLOCK(locked_tcb); 4726 } 4727 return (NULL); 4728 break; 4729 case SCTP_SELECTIVE_ACK: 4730 { 4731 struct sctp_sack_chunk *sack; 4732 int abort_now = 0; 4733 uint32_t a_rwnd, cum_ack; 4734 uint16_t num_seg, num_dup; 4735 uint8_t flags; 4736 int offset_seg, offset_dup; 4737 4738 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4739 SCTP_STAT_INCR(sctps_recvsacks); 4740 if (stcb == NULL) { 4741 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4742 break; 4743 } 4744 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4745 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4746 break; 4747 } 4748 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4749 /*- 4750 * If we have sent a shutdown-ack, we will pay no 4751 * attention to a sack sent in to us since 4752 * we don't care anymore. 4753 */ 4754 break; 4755 } 4756 sack = (struct sctp_sack_chunk *)ch; 4757 flags = ch->chunk_flags; 4758 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4759 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4760 num_dup = ntohs(sack->sack.num_dup_tsns); 4761 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4762 if (sizeof(struct sctp_sack_chunk) + 4763 num_seg * sizeof(struct sctp_gap_ack_block) + 4764 num_dup * sizeof(uint32_t) != chk_length) { 4765 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4766 break; 4767 } 4768 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4769 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4770 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4771 cum_ack, num_seg, a_rwnd); 4772 stcb->asoc.seen_a_sack_this_pkt = 1; 4773 if ((stcb->asoc.pr_sctp_cnt == 0) && 4774 (num_seg == 0) && 4775 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4776 (stcb->asoc.saw_sack_with_frags == 0) && 4777 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4778 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4779 ) { 4780 /* 4781 * We have a SIMPLE sack having no 4782 * prior segments and data on sent 4783 * queue to be acked.. Use the 4784 * faster path sack processing. We 4785 * also allow window update sacks 4786 * with no missing segments to go 4787 * this way too. 4788 */ 4789 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4790 } else { 4791 if (netp && *netp) 4792 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4793 num_seg, 0, num_dup, &abort_now, flags, 4794 cum_ack, a_rwnd, ecne_seen); 4795 } 4796 if (abort_now) { 4797 /* ABORT signal from sack processing */ 4798 *offset = length; 4799 return (NULL); 4800 } 4801 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4802 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4803 (stcb->asoc.stream_queue_cnt == 0)) { 4804 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4805 } 4806 } 4807 break; 4808 /* 4809 * EY - nr_sack: If the received chunk is an 4810 * nr_sack chunk 4811 */ 4812 case SCTP_NR_SELECTIVE_ACK: 4813 { 4814 struct sctp_nr_sack_chunk *nr_sack; 4815 int abort_now = 0; 4816 uint32_t a_rwnd, cum_ack; 4817 uint16_t num_seg, num_nr_seg, num_dup; 4818 uint8_t flags; 4819 int offset_seg, offset_dup; 4820 4821 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4822 SCTP_STAT_INCR(sctps_recvsacks); 4823 if (stcb == NULL) { 4824 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4825 break; 4826 } 4827 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4828 (stcb->asoc.peer_supports_nr_sack == 0)) { 4829 goto unknown_chunk; 4830 } 4831 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4832 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4833 break; 4834 } 4835 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4836 /*- 4837 * If we have sent a shutdown-ack, we will pay no 4838 * attention to a sack sent in to us since 4839 * we don't care anymore. 4840 */ 4841 break; 4842 } 4843 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4844 flags = ch->chunk_flags; 4845 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4846 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4847 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4848 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4849 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4850 if (sizeof(struct sctp_nr_sack_chunk) + 4851 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4852 num_dup * sizeof(uint32_t) != chk_length) { 4853 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4854 break; 4855 } 4856 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4857 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4858 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4859 cum_ack, num_seg, a_rwnd); 4860 stcb->asoc.seen_a_sack_this_pkt = 1; 4861 if ((stcb->asoc.pr_sctp_cnt == 0) && 4862 (num_seg == 0) && (num_nr_seg == 0) && 4863 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4864 (stcb->asoc.saw_sack_with_frags == 0) && 4865 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4866 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4867 /* 4868 * We have a SIMPLE sack having no 4869 * prior segments and data on sent 4870 * queue to be acked. Use the faster 4871 * path sack processing. We also 4872 * allow window update sacks with no 4873 * missing segments to go this way 4874 * too. 4875 */ 4876 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4877 &abort_now, ecne_seen); 4878 } else { 4879 if (netp && *netp) 4880 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4881 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4882 cum_ack, a_rwnd, ecne_seen); 4883 } 4884 if (abort_now) { 4885 /* ABORT signal from sack processing */ 4886 *offset = length; 4887 return (NULL); 4888 } 4889 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4890 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4891 (stcb->asoc.stream_queue_cnt == 0)) { 4892 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4893 } 4894 } 4895 break; 4896 4897 case SCTP_HEARTBEAT_REQUEST: 4898 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4899 if ((stcb) && netp && *netp) { 4900 SCTP_STAT_INCR(sctps_recvheartbeat); 4901 sctp_send_heartbeat_ack(stcb, m, *offset, 4902 chk_length, *netp); 4903 4904 /* He's alive so give him credit */ 4905 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4906 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4907 stcb->asoc.overall_error_count, 4908 0, 4909 SCTP_FROM_SCTP_INPUT, 4910 __LINE__); 4911 } 4912 stcb->asoc.overall_error_count = 0; 4913 } 4914 break; 4915 case SCTP_HEARTBEAT_ACK: 4916 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4917 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4918 /* Its not ours */ 4919 *offset = length; 4920 if (locked_tcb) { 4921 SCTP_TCB_UNLOCK(locked_tcb); 4922 } 4923 return (NULL); 4924 } 4925 /* He's alive so give him credit */ 4926 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4927 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4928 stcb->asoc.overall_error_count, 4929 0, 4930 SCTP_FROM_SCTP_INPUT, 4931 __LINE__); 4932 } 4933 stcb->asoc.overall_error_count = 0; 4934 SCTP_STAT_INCR(sctps_recvheartbeatack); 4935 if (netp && *netp) 4936 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4937 stcb, *netp); 4938 break; 4939 case SCTP_ABORT_ASSOCIATION: 4940 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4941 stcb); 4942 if ((stcb) && netp && *netp) 4943 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4944 stcb, *netp); 4945 *offset = length; 4946 return (NULL); 4947 break; 4948 case SCTP_SHUTDOWN: 4949 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4950 stcb); 4951 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4952 *offset = length; 4953 if (locked_tcb) { 4954 SCTP_TCB_UNLOCK(locked_tcb); 4955 } 4956 return (NULL); 4957 } 4958 if (netp && *netp) { 4959 int abort_flag = 0; 4960 4961 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4962 stcb, *netp, &abort_flag); 4963 if (abort_flag) { 4964 *offset = length; 4965 return (NULL); 4966 } 4967 } 4968 break; 4969 case SCTP_SHUTDOWN_ACK: 4970 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4971 if ((stcb) && (netp) && (*netp)) 4972 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4973 *offset = length; 4974 return (NULL); 4975 break; 4976 4977 case SCTP_OPERATION_ERROR: 4978 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4979 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4980 4981 *offset = length; 4982 return (NULL); 4983 } 4984 break; 4985 case SCTP_COOKIE_ECHO: 4986 SCTPDBG(SCTP_DEBUG_INPUT3, 4987 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4988 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4989 ; 4990 } else { 4991 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4992 /* We are not interested anymore */ 4993 abend: 4994 if (stcb) { 4995 SCTP_TCB_UNLOCK(stcb); 4996 } 4997 *offset = length; 4998 return (NULL); 4999 } 5000 } 5001 /* 5002 * First are we accepting? We do this again here 5003 * since it is possible that a previous endpoint WAS 5004 * listening responded to a INIT-ACK and then 5005 * closed. We opened and bound.. and are now no 5006 * longer listening. 5007 */ 5008 5009 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5010 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5011 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5012 struct mbuf *oper; 5013 struct sctp_paramhdr *phdr; 5014 5015 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5016 0, M_DONTWAIT, 1, MT_DATA); 5017 if (oper) { 5018 SCTP_BUF_LEN(oper) = 5019 sizeof(struct sctp_paramhdr); 5020 phdr = mtod(oper, 5021 struct sctp_paramhdr *); 5022 phdr->param_type = 5023 htons(SCTP_CAUSE_OUT_OF_RESC); 5024 phdr->param_length = 5025 htons(sizeof(struct sctp_paramhdr)); 5026 } 5027 sctp_abort_association(inp, stcb, m, 5028 iphlen, sh, oper, vrf_id, port); 5029 } 5030 *offset = length; 5031 return (NULL); 5032 } else { 5033 struct mbuf *ret_buf; 5034 struct sctp_inpcb *linp; 5035 5036 if (stcb) { 5037 linp = NULL; 5038 } else { 5039 linp = inp; 5040 } 5041 5042 if (linp) { 5043 SCTP_ASOC_CREATE_LOCK(linp); 5044 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5045 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5046 SCTP_ASOC_CREATE_UNLOCK(linp); 5047 goto abend; 5048 } 5049 } 5050 if (netp) { 5051 ret_buf = 5052 sctp_handle_cookie_echo(m, iphlen, 5053 *offset, sh, 5054 (struct sctp_cookie_echo_chunk *)ch, 5055 &inp, &stcb, netp, 5056 auth_skipped, 5057 auth_offset, 5058 auth_len, 5059 &locked_tcb, 5060 vrf_id, 5061 port); 5062 } else { 5063 ret_buf = NULL; 5064 } 5065 if (linp) { 5066 SCTP_ASOC_CREATE_UNLOCK(linp); 5067 } 5068 if (ret_buf == NULL) { 5069 if (locked_tcb) { 5070 SCTP_TCB_UNLOCK(locked_tcb); 5071 } 5072 SCTPDBG(SCTP_DEBUG_INPUT3, 5073 "GAK, null buffer\n"); 5074 *offset = length; 5075 return (NULL); 5076 } 5077 /* if AUTH skipped, see if it verified... */ 5078 if (auth_skipped) { 5079 got_auth = 1; 5080 auth_skipped = 0; 5081 } 5082 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5083 /* 5084 * Restart the timer if we have 5085 * pending data 5086 */ 5087 struct sctp_tmit_chunk *chk; 5088 5089 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5090 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5091 } 5092 } 5093 break; 5094 case SCTP_COOKIE_ACK: 5095 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5096 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5097 if (locked_tcb) { 5098 SCTP_TCB_UNLOCK(locked_tcb); 5099 } 5100 return (NULL); 5101 } 5102 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5103 /* We are not interested anymore */ 5104 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5105 ; 5106 } else if (stcb) { 5107 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5108 so = SCTP_INP_SO(inp); 5109 atomic_add_int(&stcb->asoc.refcnt, 1); 5110 SCTP_TCB_UNLOCK(stcb); 5111 SCTP_SOCKET_LOCK(so, 1); 5112 SCTP_TCB_LOCK(stcb); 5113 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5114 #endif 5115 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5116 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5117 SCTP_SOCKET_UNLOCK(so, 1); 5118 #endif 5119 *offset = length; 5120 return (NULL); 5121 } 5122 } 5123 /* He's alive so give him credit */ 5124 if ((stcb) && netp && *netp) { 5125 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5126 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5127 stcb->asoc.overall_error_count, 5128 0, 5129 SCTP_FROM_SCTP_INPUT, 5130 __LINE__); 5131 } 5132 stcb->asoc.overall_error_count = 0; 5133 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5134 } 5135 break; 5136 case SCTP_ECN_ECHO: 5137 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5138 /* He's alive so give him credit */ 5139 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5140 /* Its not ours */ 5141 if (locked_tcb) { 5142 SCTP_TCB_UNLOCK(locked_tcb); 5143 } 5144 *offset = length; 5145 return (NULL); 5146 } 5147 if (stcb) { 5148 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5149 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5150 stcb->asoc.overall_error_count, 5151 0, 5152 SCTP_FROM_SCTP_INPUT, 5153 __LINE__); 5154 } 5155 stcb->asoc.overall_error_count = 0; 5156 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5157 stcb); 5158 ecne_seen = 1; 5159 } 5160 break; 5161 case SCTP_ECN_CWR: 5162 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5163 /* He's alive so give him credit */ 5164 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5165 /* Its not ours */ 5166 if (locked_tcb) { 5167 SCTP_TCB_UNLOCK(locked_tcb); 5168 } 5169 *offset = length; 5170 return (NULL); 5171 } 5172 if (stcb) { 5173 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5174 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5175 stcb->asoc.overall_error_count, 5176 0, 5177 SCTP_FROM_SCTP_INPUT, 5178 __LINE__); 5179 } 5180 stcb->asoc.overall_error_count = 0; 5181 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5182 } 5183 break; 5184 case SCTP_SHUTDOWN_COMPLETE: 5185 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5186 /* must be first and only chunk */ 5187 if ((num_chunks > 1) || 5188 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5189 *offset = length; 5190 if (locked_tcb) { 5191 SCTP_TCB_UNLOCK(locked_tcb); 5192 } 5193 return (NULL); 5194 } 5195 if ((stcb) && netp && *netp) { 5196 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5197 stcb, *netp); 5198 } 5199 *offset = length; 5200 return (NULL); 5201 break; 5202 case SCTP_ASCONF: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5204 /* He's alive so give him credit */ 5205 if (stcb) { 5206 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5207 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5208 stcb->asoc.overall_error_count, 5209 0, 5210 SCTP_FROM_SCTP_INPUT, 5211 __LINE__); 5212 } 5213 stcb->asoc.overall_error_count = 0; 5214 sctp_handle_asconf(m, *offset, 5215 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5216 asconf_cnt++; 5217 } 5218 break; 5219 case SCTP_ASCONF_ACK: 5220 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5221 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5222 /* Its not ours */ 5223 if (locked_tcb) { 5224 SCTP_TCB_UNLOCK(locked_tcb); 5225 } 5226 *offset = length; 5227 return (NULL); 5228 } 5229 if ((stcb) && netp && *netp) { 5230 /* He's alive so give him credit */ 5231 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5232 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5233 stcb->asoc.overall_error_count, 5234 0, 5235 SCTP_FROM_SCTP_INPUT, 5236 __LINE__); 5237 } 5238 stcb->asoc.overall_error_count = 0; 5239 sctp_handle_asconf_ack(m, *offset, 5240 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5241 if (abort_no_unlock) 5242 return (NULL); 5243 } 5244 break; 5245 case SCTP_FORWARD_CUM_TSN: 5246 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5247 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5248 /* Its not ours */ 5249 if (locked_tcb) { 5250 SCTP_TCB_UNLOCK(locked_tcb); 5251 } 5252 *offset = length; 5253 return (NULL); 5254 } 5255 /* He's alive so give him credit */ 5256 if (stcb) { 5257 int abort_flag = 0; 5258 5259 stcb->asoc.overall_error_count = 0; 5260 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5261 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5262 stcb->asoc.overall_error_count, 5263 0, 5264 SCTP_FROM_SCTP_INPUT, 5265 __LINE__); 5266 } 5267 *fwd_tsn_seen = 1; 5268 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5269 /* We are not interested anymore */ 5270 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5271 so = SCTP_INP_SO(inp); 5272 atomic_add_int(&stcb->asoc.refcnt, 1); 5273 SCTP_TCB_UNLOCK(stcb); 5274 SCTP_SOCKET_LOCK(so, 1); 5275 SCTP_TCB_LOCK(stcb); 5276 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5277 #endif 5278 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5279 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5280 SCTP_SOCKET_UNLOCK(so, 1); 5281 #endif 5282 *offset = length; 5283 return (NULL); 5284 } 5285 sctp_handle_forward_tsn(stcb, 5286 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5287 if (abort_flag) { 5288 *offset = length; 5289 return (NULL); 5290 } else { 5291 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5292 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5293 stcb->asoc.overall_error_count, 5294 0, 5295 SCTP_FROM_SCTP_INPUT, 5296 __LINE__); 5297 } 5298 stcb->asoc.overall_error_count = 0; 5299 } 5300 5301 } 5302 break; 5303 case SCTP_STREAM_RESET: 5304 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5305 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5306 /* Its not ours */ 5307 if (locked_tcb) { 5308 SCTP_TCB_UNLOCK(locked_tcb); 5309 } 5310 *offset = length; 5311 return (NULL); 5312 } 5313 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5314 /* We are not interested anymore */ 5315 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5316 so = SCTP_INP_SO(inp); 5317 atomic_add_int(&stcb->asoc.refcnt, 1); 5318 SCTP_TCB_UNLOCK(stcb); 5319 SCTP_SOCKET_LOCK(so, 1); 5320 SCTP_TCB_LOCK(stcb); 5321 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5322 #endif 5323 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5324 #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5325 SCTP_SOCKET_UNLOCK(so, 1); 5326 #endif 5327 *offset = length; 5328 return (NULL); 5329 } 5330 if (stcb->asoc.peer_supports_strreset == 0) { 5331 /* 5332 * hmm, peer should have announced this, but 5333 * we will turn it on since he is sending us 5334 * a stream reset. 5335 */ 5336 stcb->asoc.peer_supports_strreset = 1; 5337 } 5338 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5339 /* stop processing */ 5340 *offset = length; 5341 return (NULL); 5342 } 5343 break; 5344 case SCTP_PACKET_DROPPED: 5345 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5346 /* re-get it all please */ 5347 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5348 /* Its not ours */ 5349 if (locked_tcb) { 5350 SCTP_TCB_UNLOCK(locked_tcb); 5351 } 5352 *offset = length; 5353 return (NULL); 5354 } 5355 if (ch && (stcb) && netp && (*netp)) { 5356 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5357 stcb, *netp, 5358 min(chk_length, (sizeof(chunk_buf) - 4))); 5359 5360 } 5361 break; 5362 5363 case SCTP_AUTHENTICATION: 5364 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5365 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5366 goto unknown_chunk; 5367 5368 if (stcb == NULL) { 5369 /* save the first AUTH for later processing */ 5370 if (auth_skipped == 0) { 5371 auth_offset = *offset; 5372 auth_len = chk_length; 5373 auth_skipped = 1; 5374 } 5375 /* skip this chunk (temporarily) */ 5376 goto next_chunk; 5377 } 5378 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5379 (chk_length > (sizeof(struct sctp_auth_chunk) + 5380 SCTP_AUTH_DIGEST_LEN_MAX))) { 5381 /* Its not ours */ 5382 if (locked_tcb) { 5383 SCTP_TCB_UNLOCK(locked_tcb); 5384 } 5385 *offset = length; 5386 return (NULL); 5387 } 5388 if (got_auth == 1) { 5389 /* skip this chunk... it's already auth'd */ 5390 goto next_chunk; 5391 } 5392 got_auth = 1; 5393 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5394 m, *offset)) { 5395 /* auth HMAC failed so dump the packet */ 5396 *offset = length; 5397 return (stcb); 5398 } else { 5399 /* remaining chunks are HMAC checked */ 5400 stcb->asoc.authenticated = 1; 5401 } 5402 break; 5403 5404 default: 5405 unknown_chunk: 5406 /* it's an unknown chunk! */ 5407 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5408 struct mbuf *mm; 5409 struct sctp_paramhdr *phd; 5410 5411 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5412 0, M_DONTWAIT, 1, MT_DATA); 5413 if (mm) { 5414 phd = mtod(mm, struct sctp_paramhdr *); 5415 /* 5416 * We cheat and use param type since 5417 * we did not bother to define a 5418 * error cause struct. They are the 5419 * same basic format with different 5420 * names. 5421 */ 5422 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5423 phd->param_length = htons(chk_length + sizeof(*phd)); 5424 SCTP_BUF_LEN(mm) = sizeof(*phd); 5425 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5426 M_DONTWAIT); 5427 if (SCTP_BUF_NEXT(mm)) { 5428 #ifdef SCTP_MBUF_LOGGING 5429 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5430 struct mbuf *mat; 5431 5432 mat = SCTP_BUF_NEXT(mm); 5433 while (mat) { 5434 if (SCTP_BUF_IS_EXTENDED(mat)) { 5435 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5436 } 5437 mat = SCTP_BUF_NEXT(mat); 5438 } 5439 } 5440 #endif 5441 sctp_queue_op_err(stcb, mm); 5442 } else { 5443 sctp_m_freem(mm); 5444 } 5445 } 5446 } 5447 if ((ch->chunk_type & 0x80) == 0) { 5448 /* discard this packet */ 5449 *offset = length; 5450 return (stcb); 5451 } /* else skip this bad chunk and continue... */ 5452 break; 5453 } /* switch (ch->chunk_type) */ 5454 5455 5456 next_chunk: 5457 /* get the next chunk */ 5458 *offset += SCTP_SIZE32(chk_length); 5459 if (*offset >= length) { 5460 /* no more data left in the mbuf chain */ 5461 break; 5462 } 5463 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5464 sizeof(struct sctp_chunkhdr), chunk_buf); 5465 if (ch == NULL) { 5466 if (locked_tcb) { 5467 SCTP_TCB_UNLOCK(locked_tcb); 5468 } 5469 *offset = length; 5470 return (NULL); 5471 } 5472 } /* while */ 5473 5474 if (asconf_cnt > 0 && stcb != NULL) { 5475 sctp_send_asconf_ack(stcb); 5476 } 5477 return (stcb); 5478 } 5479 5480 5481 #ifdef INVARIANTS 5482 #ifdef __GNUC__ 5483 __attribute__((noinline)) 5484 #endif 5485 void 5486 sctp_validate_no_locks(struct sctp_inpcb *inp) 5487 { 5488 struct sctp_tcb *lstcb; 5489 5490 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5491 if (mtx_owned(&lstcb->tcb_mtx)) { 5492 panic("Own lock on stcb at return from input"); 5493 } 5494 } 5495 if (mtx_owned(&inp->inp_create_mtx)) { 5496 panic("Own create lock on inp"); 5497 } 5498 if (mtx_owned(&inp->inp_mtx)) { 5499 panic("Own inp lock on inp"); 5500 } 5501 } 5502 5503 #endif 5504 5505 /* 5506 * common input chunk processing (v4 and v6) 5507 */ 5508 void 5509 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5510 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5511 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5512 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5513 { 5514 /* 5515 * Control chunk processing 5516 */ 5517 uint32_t high_tsn; 5518 int fwd_tsn_seen = 0, data_processed = 0; 5519 struct mbuf *m = *mm; 5520 int un_sent; 5521 int cnt_ctrl_ready = 0; 5522 5523 SCTP_STAT_INCR(sctps_recvdatagrams); 5524 #ifdef SCTP_AUDITING_ENABLED 5525 sctp_audit_log(0xE0, 1); 5526 sctp_auditing(0, inp, stcb, net); 5527 #endif 5528 5529 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5530 m, iphlen, offset, length, stcb); 5531 if (stcb) { 5532 /* always clear this before beginning a packet */ 5533 stcb->asoc.authenticated = 0; 5534 stcb->asoc.seen_a_sack_this_pkt = 0; 5535 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5536 stcb, stcb->asoc.state); 5537 5538 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5539 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5540 /*- 5541 * If we hit here, we had a ref count 5542 * up when the assoc was aborted and the 5543 * timer is clearing out the assoc, we should 5544 * NOT respond to any packet.. its OOTB. 5545 */ 5546 SCTP_TCB_UNLOCK(stcb); 5547 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5548 vrf_id, port); 5549 goto out_now; 5550 } 5551 } 5552 if (IS_SCTP_CONTROL(ch)) { 5553 /* process the control portion of the SCTP packet */ 5554 /* sa_ignore NO_NULL_CHK */ 5555 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5556 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5557 if (stcb) { 5558 /* 5559 * This covers us if the cookie-echo was there and 5560 * it changes our INP. 5561 */ 5562 inp = stcb->sctp_ep; 5563 if ((net) && (port)) { 5564 if (net->port == 0) { 5565 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5566 } 5567 net->port = port; 5568 } 5569 } 5570 } else { 5571 /* 5572 * no control chunks, so pre-process DATA chunks (these 5573 * checks are taken care of by control processing) 5574 */ 5575 5576 /* 5577 * if DATA only packet, and auth is required, then punt... 5578 * can't have authenticated without any AUTH (control) 5579 * chunks 5580 */ 5581 if ((stcb != NULL) && 5582 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5583 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5584 /* "silently" ignore */ 5585 SCTP_STAT_INCR(sctps_recvauthmissing); 5586 SCTP_TCB_UNLOCK(stcb); 5587 goto out_now; 5588 } 5589 if (stcb == NULL) { 5590 /* out of the blue DATA chunk */ 5591 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5592 vrf_id, port); 5593 goto out_now; 5594 } 5595 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5596 /* v_tag mismatch! */ 5597 SCTP_STAT_INCR(sctps_badvtag); 5598 SCTP_TCB_UNLOCK(stcb); 5599 goto out_now; 5600 } 5601 } 5602 5603 if (stcb == NULL) { 5604 /* 5605 * no valid TCB for this packet, or we found it's a bad 5606 * packet while processing control, or we're done with this 5607 * packet (done or skip rest of data), so we drop it... 5608 */ 5609 goto out_now; 5610 } 5611 /* 5612 * DATA chunk processing 5613 */ 5614 /* plow through the data chunks while length > offset */ 5615 5616 /* 5617 * Rest should be DATA only. Check authentication state if AUTH for 5618 * DATA is required. 5619 */ 5620 if ((length > offset) && 5621 (stcb != NULL) && 5622 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5623 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5624 !stcb->asoc.authenticated) { 5625 /* "silently" ignore */ 5626 SCTP_STAT_INCR(sctps_recvauthmissing); 5627 SCTPDBG(SCTP_DEBUG_AUTH1, 5628 "Data chunk requires AUTH, skipped\n"); 5629 goto trigger_send; 5630 } 5631 if (length > offset) { 5632 int retval; 5633 5634 /* 5635 * First check to make sure our state is correct. We would 5636 * not get here unless we really did have a tag, so we don't 5637 * abort if this happens, just dump the chunk silently. 5638 */ 5639 switch (SCTP_GET_STATE(&stcb->asoc)) { 5640 case SCTP_STATE_COOKIE_ECHOED: 5641 /* 5642 * we consider data with valid tags in this state 5643 * shows us the cookie-ack was lost. Imply it was 5644 * there. 5645 */ 5646 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5647 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5648 stcb->asoc.overall_error_count, 5649 0, 5650 SCTP_FROM_SCTP_INPUT, 5651 __LINE__); 5652 } 5653 stcb->asoc.overall_error_count = 0; 5654 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5655 break; 5656 case SCTP_STATE_COOKIE_WAIT: 5657 /* 5658 * We consider OOTB any data sent during asoc setup. 5659 */ 5660 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5661 vrf_id, port); 5662 SCTP_TCB_UNLOCK(stcb); 5663 goto out_now; 5664 /* sa_ignore NOTREACHED */ 5665 break; 5666 case SCTP_STATE_EMPTY: /* should not happen */ 5667 case SCTP_STATE_INUSE: /* should not happen */ 5668 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5669 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5670 default: 5671 SCTP_TCB_UNLOCK(stcb); 5672 goto out_now; 5673 /* sa_ignore NOTREACHED */ 5674 break; 5675 case SCTP_STATE_OPEN: 5676 case SCTP_STATE_SHUTDOWN_SENT: 5677 break; 5678 } 5679 /* plow through the data chunks while length > offset */ 5680 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5681 inp, stcb, net, &high_tsn); 5682 if (retval == 2) { 5683 /* 5684 * The association aborted, NO UNLOCK needed since 5685 * the association is destroyed. 5686 */ 5687 goto out_now; 5688 } 5689 data_processed = 1; 5690 /* 5691 * Anything important needs to have been m_copy'ed in 5692 * process_data 5693 */ 5694 } 5695 /* take care of ecn */ 5696 if ((data_processed == 1) && 5697 (stcb->asoc.ecn_allowed == 1) && 5698 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5699 /* Yep, we need to add a ECNE */ 5700 sctp_send_ecn_echo(stcb, net, high_tsn); 5701 } 5702 if ((data_processed == 0) && (fwd_tsn_seen)) { 5703 int was_a_gap; 5704 uint32_t highest_tsn; 5705 5706 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5707 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5708 } else { 5709 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5710 } 5711 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5712 stcb->asoc.send_sack = 1; 5713 sctp_sack_check(stcb, was_a_gap); 5714 } else if (fwd_tsn_seen) { 5715 stcb->asoc.send_sack = 1; 5716 } 5717 /* trigger send of any chunks in queue... */ 5718 trigger_send: 5719 #ifdef SCTP_AUDITING_ENABLED 5720 sctp_audit_log(0xE0, 2); 5721 sctp_auditing(1, inp, stcb, net); 5722 #endif 5723 SCTPDBG(SCTP_DEBUG_INPUT1, 5724 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5725 stcb->asoc.peers_rwnd, 5726 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5727 stcb->asoc.total_flight); 5728 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5729 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5730 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5731 } 5732 if (cnt_ctrl_ready || 5733 ((un_sent) && 5734 (stcb->asoc.peers_rwnd > 0 || 5735 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5736 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5737 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5738 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5739 } 5740 #ifdef SCTP_AUDITING_ENABLED 5741 sctp_audit_log(0xE0, 3); 5742 sctp_auditing(2, inp, stcb, net); 5743 #endif 5744 SCTP_TCB_UNLOCK(stcb); 5745 out_now: 5746 #ifdef INVARIANTS 5747 sctp_validate_no_locks(inp); 5748 #endif 5749 return; 5750 } 5751 5752 #if 0 5753 static void 5754 sctp_print_mbuf_chain(struct mbuf *m) 5755 { 5756 for (; m; m = SCTP_BUF_NEXT(m)) { 5757 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5758 if (SCTP_BUF_IS_EXTENDED(m)) 5759 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5760 } 5761 } 5762 5763 #endif 5764 5765 #ifdef INET 5766 void 5767 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5768 { 5769 #ifdef SCTP_MBUF_LOGGING 5770 struct mbuf *mat; 5771 5772 #endif 5773 struct mbuf *m; 5774 int iphlen; 5775 uint32_t vrf_id = 0; 5776 uint8_t ecn_bits; 5777 struct ip *ip; 5778 struct sctphdr *sh; 5779 struct sctp_inpcb *inp = NULL; 5780 struct sctp_nets *net; 5781 struct sctp_tcb *stcb = NULL; 5782 struct sctp_chunkhdr *ch; 5783 int refcount_up = 0; 5784 int length, mlen, offset; 5785 5786 #if !defined(SCTP_WITH_NO_CSUM) 5787 uint32_t check, calc_check; 5788 5789 #endif 5790 5791 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5792 SCTP_RELEASE_PKT(i_pak); 5793 return; 5794 } 5795 mlen = SCTP_HEADER_LEN(i_pak); 5796 iphlen = off; 5797 m = SCTP_HEADER_TO_CHAIN(i_pak); 5798 5799 net = NULL; 5800 SCTP_STAT_INCR(sctps_recvpackets); 5801 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5802 5803 5804 #ifdef SCTP_MBUF_LOGGING 5805 /* Log in any input mbufs */ 5806 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5807 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5808 if (SCTP_BUF_IS_EXTENDED(mat)) { 5809 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5810 } 5811 } 5812 } 5813 #endif 5814 #ifdef SCTP_PACKET_LOGGING 5815 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5816 sctp_packet_log(m, mlen); 5817 #endif 5818 /* 5819 * Must take out the iphlen, since mlen expects this (only effect lb 5820 * case) 5821 */ 5822 mlen -= iphlen; 5823 5824 /* 5825 * Get IP, SCTP, and first chunk header together in first mbuf. 5826 */ 5827 ip = mtod(m, struct ip *); 5828 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5829 if (SCTP_BUF_LEN(m) < offset) { 5830 if ((m = m_pullup(m, offset)) == 0) { 5831 SCTP_STAT_INCR(sctps_hdrops); 5832 return; 5833 } 5834 ip = mtod(m, struct ip *); 5835 } 5836 /* validate mbuf chain length with IP payload length */ 5837 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5838 SCTP_STAT_INCR(sctps_hdrops); 5839 goto bad; 5840 } 5841 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5842 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5843 SCTPDBG(SCTP_DEBUG_INPUT1, 5844 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5845 5846 /* SCTP does not allow broadcasts or multicasts */ 5847 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5848 goto bad; 5849 } 5850 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5851 /* 5852 * We only look at broadcast if its a front state, All 5853 * others we will not have a tcb for anyway. 5854 */ 5855 goto bad; 5856 } 5857 /* validate SCTP checksum */ 5858 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5859 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5860 m->m_pkthdr.len, 5861 if_name(m->m_pkthdr.rcvif), 5862 m->m_pkthdr.csum_flags); 5863 #if defined(SCTP_WITH_NO_CSUM) 5864 SCTP_STAT_INCR(sctps_recvnocrc); 5865 #else 5866 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5867 SCTP_STAT_INCR(sctps_recvhwcrc); 5868 goto sctp_skip_csum_4; 5869 } 5870 check = sh->checksum; /* save incoming checksum */ 5871 sh->checksum = 0; /* prepare for calc */ 5872 calc_check = sctp_calculate_cksum(m, iphlen); 5873 sh->checksum = check; 5874 SCTP_STAT_INCR(sctps_recvswcrc); 5875 if (calc_check != check) { 5876 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5877 calc_check, check, m, mlen, iphlen); 5878 5879 stcb = sctp_findassociation_addr(m, 5880 offset - sizeof(*ch), 5881 sh, ch, &inp, &net, 5882 vrf_id); 5883 if ((net) && (port)) { 5884 if (net->port == 0) { 5885 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5886 } 5887 net->port = port; 5888 } 5889 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5890 net->flowid = m->m_pkthdr.flowid; 5891 #ifdef INVARIANTS 5892 net->flowidset = 1; 5893 #endif 5894 } 5895 if ((inp) && (stcb)) { 5896 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5897 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5898 } else if ((inp != NULL) && (stcb == NULL)) { 5899 refcount_up = 1; 5900 } 5901 SCTP_STAT_INCR(sctps_badsum); 5902 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5903 goto bad; 5904 } 5905 sctp_skip_csum_4: 5906 #endif 5907 /* destination port of 0 is illegal, based on RFC2960. */ 5908 if (sh->dest_port == 0) { 5909 SCTP_STAT_INCR(sctps_hdrops); 5910 goto bad; 5911 } 5912 /* 5913 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5914 * IP/SCTP/first chunk header... 5915 */ 5916 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5917 sh, ch, &inp, &net, vrf_id); 5918 if ((net) && (port)) { 5919 if (net->port == 0) { 5920 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5921 } 5922 net->port = port; 5923 } 5924 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5925 net->flowid = m->m_pkthdr.flowid; 5926 #ifdef INVARIANTS 5927 net->flowidset = 1; 5928 #endif 5929 } 5930 /* inp's ref-count increased && stcb locked */ 5931 if (inp == NULL) { 5932 struct sctp_init_chunk *init_chk, chunk_buf; 5933 5934 SCTP_STAT_INCR(sctps_noport); 5935 #ifdef ICMP_BANDLIM 5936 /* 5937 * we use the bandwidth limiting to protect against sending 5938 * too many ABORTS all at once. In this case these count the 5939 * same as an ICMP message. 5940 */ 5941 if (badport_bandlim(0) < 0) 5942 goto bad; 5943 #endif /* ICMP_BANDLIM */ 5944 SCTPDBG(SCTP_DEBUG_INPUT1, 5945 "Sending a ABORT from packet entry!\n"); 5946 if (ch->chunk_type == SCTP_INITIATION) { 5947 /* 5948 * we do a trick here to get the INIT tag, dig in 5949 * and get the tag from the INIT and put it in the 5950 * common header. 5951 */ 5952 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5953 iphlen + sizeof(*sh), sizeof(*init_chk), 5954 (uint8_t *) & chunk_buf); 5955 if (init_chk != NULL) 5956 sh->v_tag = init_chk->init.initiate_tag; 5957 } 5958 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5959 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 5960 goto bad; 5961 } 5962 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5963 goto bad; 5964 } 5965 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5966 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5967 goto bad; 5968 } else if (stcb == NULL) { 5969 refcount_up = 1; 5970 } 5971 #ifdef IPSEC 5972 /* 5973 * I very much doubt any of the IPSEC stuff will work but I have no 5974 * idea, so I will leave it in place. 5975 */ 5976 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5977 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5978 SCTP_STAT_INCR(sctps_hdrops); 5979 goto bad; 5980 } 5981 #endif /* IPSEC */ 5982 5983 /* 5984 * common chunk processing 5985 */ 5986 length = ip->ip_len + iphlen; 5987 offset -= sizeof(struct sctp_chunkhdr); 5988 5989 ecn_bits = ip->ip_tos; 5990 5991 /* sa_ignore NO_NULL_CHK */ 5992 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5993 inp, stcb, net, ecn_bits, vrf_id, port); 5994 /* inp's ref-count reduced && stcb unlocked */ 5995 if (m) { 5996 sctp_m_freem(m); 5997 } 5998 if ((inp) && (refcount_up)) { 5999 /* reduce ref-count */ 6000 SCTP_INP_DECR_REF(inp); 6001 } 6002 return; 6003 bad: 6004 if (stcb) { 6005 SCTP_TCB_UNLOCK(stcb); 6006 } 6007 if ((inp) && (refcount_up)) { 6008 /* reduce ref-count */ 6009 SCTP_INP_DECR_REF(inp); 6010 } 6011 if (m) { 6012 sctp_m_freem(m); 6013 } 6014 return; 6015 } 6016 6017 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6018 extern int *sctp_cpuarry; 6019 6020 #endif 6021 6022 void 6023 sctp_input(struct mbuf *m, int off) 6024 { 6025 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6026 struct ip *ip; 6027 struct sctphdr *sh; 6028 int offset; 6029 int cpu_to_use; 6030 uint32_t flowid, tag; 6031 6032 if (mp_ncpus > 1) { 6033 if (m->m_flags & M_FLOWID) { 6034 flowid = m->m_pkthdr.flowid; 6035 } else { 6036 /* 6037 * No flow id built by lower layers fix it so we 6038 * create one. 6039 */ 6040 ip = mtod(m, struct ip *); 6041 offset = off + sizeof(*sh); 6042 if (SCTP_BUF_LEN(m) < offset) { 6043 if ((m = m_pullup(m, offset)) == 0) { 6044 SCTP_STAT_INCR(sctps_hdrops); 6045 return; 6046 } 6047 ip = mtod(m, struct ip *); 6048 } 6049 sh = (struct sctphdr *)((caddr_t)ip + off); 6050 tag = htonl(sh->v_tag); 6051 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6052 m->m_pkthdr.flowid = flowid; 6053 m->m_flags |= M_FLOWID; 6054 } 6055 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6056 sctp_queue_to_mcore(m, off, cpu_to_use); 6057 return; 6058 } 6059 #endif 6060 sctp_input_with_port(m, off, 0); 6061 } 6062 6063 #endif 6064