sctp_input.c revision 211969
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 211969 2010-08-29 18:50:30Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#include <netinet/udp.h> 51 52 53 54static void 55sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 56{ 57 struct sctp_nets *net; 58 59 /* 60 * This now not only stops all cookie timers it also stops any INIT 61 * timers as well. This will make sure that the timers are stopped 62 * in all collision cases. 63 */ 64 SCTP_TCB_LOCK_ASSERT(stcb); 65 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 66 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 67 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 68 stcb->sctp_ep, 69 stcb, 70 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 71 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 76 } 77 } 78} 79 80/* INIT handler */ 81static void 82sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 83 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 84 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 85{ 86 struct sctp_init *init; 87 struct mbuf *op_err; 88 uint32_t init_limit; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 95 goto outnow; 96 } 97 } 98 op_err = NULL; 99 init = &cp->init; 100 /* First are we accepting? */ 101 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 102 SCTPDBG(SCTP_DEBUG_INPUT2, 103 "sctp_handle_init: Abort, so_qlimit:%d\n", 104 inp->sctp_socket->so_qlimit); 105 /* 106 * FIX ME ?? What about TCP model and we have a 107 * match/restart case? Actually no fix is needed. the lookup 108 * will always find the existing assoc so stcb would not be 109 * NULL. It may be questionable to do this since we COULD 110 * just send back the INIT-ACK and hope that the app did 111 * accept()'s by the time the COOKIE was sent. But there is 112 * a price to pay for COOKIE generation and I don't want to 113 * pay it on the chance that the app will actually do some 114 * accepts(). The App just looses and should NOT be in this 115 * state :-) 116 */ 117 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 124 /* Invalid length */ 125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 126 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 /* validate parameters */ 133 if (init->initiate_tag == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 143 /* invalid parameter... send abort */ 144 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 145 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 146 vrf_id, port); 147 if (stcb) 148 *abort_no_unlock = 1; 149 goto outnow; 150 } 151 if (init->num_inbound_streams == 0) { 152 /* protocol error... send abort */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 if (init->num_outbound_streams == 0) { 161 /* protocol error... send abort */ 162 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 163 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 164 vrf_id, port); 165 if (stcb) 166 *abort_no_unlock = 1; 167 goto outnow; 168 } 169 init_limit = offset + ntohs(cp->ch.chunk_length); 170 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 171 init_limit)) { 172 /* auth parameter(s) error... send abort */ 173 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 174 if (stcb) 175 *abort_no_unlock = 1; 176 goto outnow; 177 } 178 /* send an INIT-ACK w/cookie */ 179 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 180 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 181 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 182outnow: 183 if (stcb == NULL) { 184 SCTP_INP_RUNLOCK(inp); 185 } 186} 187 188/* 189 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 190 */ 191 192int 193sctp_is_there_unsent_data(struct sctp_tcb *stcb) 194{ 195 int unsent_data = 0; 196 struct sctp_stream_queue_pending *sp; 197 struct sctp_stream_out *strq; 198 struct sctp_association *asoc; 199 200 /* 201 * This function returns the number of streams that have true unsent 202 * data on them. Note that as it looks through it will clean up any 203 * places that have old data that has been sent but left at top of 204 * stream queue. 205 */ 206 asoc = &stcb->asoc; 207 SCTP_TCB_SEND_LOCK(stcb); 208 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 209 /* Check to see if some data queued */ 210 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 211 is_there_another: 212 /* sa_ignore FREED_MEMORY */ 213 sp = TAILQ_FIRST(&strq->outqueue); 214 if (sp == NULL) { 215 continue; 216 } 217 if ((sp->msg_is_complete) && 218 (sp->length == 0) && 219 (sp->sender_all_done)) { 220 /* 221 * We are doing differed cleanup. Last time 222 * through when we took all the data the 223 * sender_all_done was not set. 224 */ 225 if (sp->put_last_out == 0) { 226 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 227 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 228 sp->sender_all_done, 229 sp->length, 230 sp->msg_is_complete, 231 sp->put_last_out); 232 } 233 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 234 TAILQ_REMOVE(&strq->outqueue, sp, next); 235 sctp_free_remote_addr(sp->net); 236 if (sp->data) { 237 sctp_m_freem(sp->data); 238 sp->data = NULL; 239 } 240 sctp_free_a_strmoq(stcb, sp); 241 goto is_there_another; 242 } else { 243 unsent_data++; 244 continue; 245 } 246 } 247 } 248 SCTP_TCB_SEND_UNLOCK(stcb); 249 return (unsent_data); 250} 251 252static int 253sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 254 struct sctp_nets *net) 255{ 256 struct sctp_init *init; 257 struct sctp_association *asoc; 258 struct sctp_nets *lnet; 259 unsigned int i; 260 261 init = &cp->init; 262 asoc = &stcb->asoc; 263 /* save off parameters */ 264 asoc->peer_vtag = ntohl(init->initiate_tag); 265 asoc->peers_rwnd = ntohl(init->a_rwnd); 266 if (TAILQ_FIRST(&asoc->nets)) { 267 /* update any ssthresh's that may have a default */ 268 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 269 lnet->ssthresh = asoc->peers_rwnd; 270 271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 272 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 273 } 274 } 275 } 276 SCTP_TCB_SEND_LOCK(stcb); 277 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 278 unsigned int newcnt; 279 struct sctp_stream_out *outs; 280 struct sctp_stream_queue_pending *sp; 281 struct sctp_tmit_chunk *chk, *chk_next; 282 283 /* abandon the upper streams */ 284 newcnt = ntohs(init->num_inbound_streams); 285 if (!TAILQ_EMPTY(&asoc->send_queue)) { 286 chk = TAILQ_FIRST(&asoc->send_queue); 287 while (chk) { 288 chk_next = TAILQ_NEXT(chk, sctp_next); 289 if (chk->rec.data.stream_number >= newcnt) { 290 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 291 asoc->send_queue_cnt--; 292 if (chk->data != NULL) { 293 sctp_free_bufspace(stcb, asoc, chk, 1); 294 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 295 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 296 if (chk->data) { 297 sctp_m_freem(chk->data); 298 chk->data = NULL; 299 } 300 } 301 sctp_free_a_chunk(stcb, chk); 302 /* sa_ignore FREED_MEMORY */ 303 } 304 chk = chk_next; 305 } 306 } 307 if (asoc->strmout) { 308 for (i = newcnt; i < asoc->pre_open_streams; i++) { 309 outs = &asoc->strmout[i]; 310 sp = TAILQ_FIRST(&outs->outqueue); 311 while (sp) { 312 TAILQ_REMOVE(&outs->outqueue, sp, next); 313 asoc->stream_queue_cnt--; 314 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 315 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 316 sp, SCTP_SO_NOT_LOCKED); 317 if (sp->data) { 318 sctp_m_freem(sp->data); 319 sp->data = NULL; 320 } 321 sctp_free_remote_addr(sp->net); 322 sp->net = NULL; 323 /* Free the chunk */ 324 sctp_free_a_strmoq(stcb, sp); 325 /* sa_ignore FREED_MEMORY */ 326 sp = TAILQ_FIRST(&outs->outqueue); 327 } 328 } 329 } 330 /* cut back the count */ 331 asoc->pre_open_streams = newcnt; 332 } 333 SCTP_TCB_SEND_UNLOCK(stcb); 334 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 335 /* init tsn's */ 336 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 337 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 338 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 339 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 340 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 341 } 342 /* This is the next one we expect */ 343 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 344 345 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 346 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 347 asoc->last_echo_tsn = asoc->asconf_seq_in; 348 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 349 /* open the requested streams */ 350 351 if (asoc->strmin != NULL) { 352 /* Free the old ones */ 353 struct sctp_queued_to_read *ctl; 354 355 for (i = 0; i < asoc->streamincnt; i++) { 356 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 357 while (ctl) { 358 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 359 sctp_free_remote_addr(ctl->whoFrom); 360 ctl->whoFrom = NULL; 361 sctp_m_freem(ctl->data); 362 ctl->data = NULL; 363 sctp_free_a_readq(stcb, ctl); 364 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 365 } 366 } 367 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 368 } 369 asoc->streamincnt = ntohs(init->num_outbound_streams); 370 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 371 asoc->streamincnt = MAX_SCTP_STREAMS; 372 } 373 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 374 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 375 if (asoc->strmin == NULL) { 376 /* we didn't get memory for the streams! */ 377 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 378 return (-1); 379 } 380 for (i = 0; i < asoc->streamincnt; i++) { 381 asoc->strmin[i].stream_no = i; 382 asoc->strmin[i].last_sequence_delivered = 0xffff; 383 /* 384 * U-stream ranges will be set when the cookie is unpacked. 385 * Or for the INIT sender they are un set (if pr-sctp not 386 * supported) when the INIT-ACK arrives. 387 */ 388 TAILQ_INIT(&asoc->strmin[i].inqueue); 389 asoc->strmin[i].delivery_started = 0; 390 } 391 /* 392 * load_address_from_init will put the addresses into the 393 * association when the COOKIE is processed or the INIT-ACK is 394 * processed. Both types of COOKIE's existing and new call this 395 * routine. It will remove addresses that are no longer in the 396 * association (for the restarting case where addresses are 397 * removed). Up front when the INIT arrives we will discard it if it 398 * is a restart and new addresses have been added. 399 */ 400 /* sa_ignore MEMLEAK */ 401 return (0); 402} 403 404/* 405 * INIT-ACK message processing/consumption returns value < 0 on error 406 */ 407static int 408sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 409 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 410 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 411{ 412 struct sctp_association *asoc; 413 struct mbuf *op_err; 414 int retval, abort_flag; 415 uint32_t initack_limit; 416 int nat_friendly = 0; 417 418 /* First verify that we have no illegal param's */ 419 abort_flag = 0; 420 op_err = NULL; 421 422 op_err = sctp_arethere_unrecognized_parameters(m, 423 (offset + sizeof(struct sctp_init_chunk)), 424 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 425 if (abort_flag) { 426 /* Send an abort and notify peer */ 427 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 428 *abort_no_unlock = 1; 429 return (-1); 430 } 431 asoc = &stcb->asoc; 432 asoc->peer_supports_nat = (uint8_t) nat_friendly; 433 /* process the peer's parameters in the INIT-ACK */ 434 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 435 if (retval < 0) { 436 return (retval); 437 } 438 initack_limit = offset + ntohs(cp->ch.chunk_length); 439 /* load all addresses */ 440 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 441 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 442 NULL))) { 443 /* Huh, we should abort */ 444 SCTPDBG(SCTP_DEBUG_INPUT1, 445 "Load addresses from INIT causes an abort %d\n", 446 retval); 447 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 448 NULL, 0, net->port); 449 *abort_no_unlock = 1; 450 return (-1); 451 } 452 /* if the peer doesn't support asconf, flush the asconf queue */ 453 if (asoc->peer_supports_asconf == 0) { 454 struct sctp_asconf_addr *aparam; 455 456 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 457 /* sa_ignore FREED_MEMORY */ 458 aparam = TAILQ_FIRST(&asoc->asconf_queue); 459 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 460 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 461 } 462 } 463 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 464 stcb->asoc.local_hmacs); 465 if (op_err) { 466 sctp_queue_op_err(stcb, op_err); 467 /* queuing will steal away the mbuf chain to the out queue */ 468 op_err = NULL; 469 } 470 /* extract the cookie and queue it to "echo" it back... */ 471 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 472 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 473 stcb->asoc.overall_error_count, 474 0, 475 SCTP_FROM_SCTP_INPUT, 476 __LINE__); 477 } 478 stcb->asoc.overall_error_count = 0; 479 net->error_count = 0; 480 481 /* 482 * Cancel the INIT timer, We do this first before queueing the 483 * cookie. We always cancel at the primary to assue that we are 484 * canceling the timer started by the INIT which always goes to the 485 * primary. 486 */ 487 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 488 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 489 490 /* calculate the RTO */ 491 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 492 493 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, 0, net->port); 524 *abort_no_unlock = 1; 525 } 526 return (retval); 527 } 528 return (0); 529} 530 531static void 532sctp_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 sockaddr_in *sin; 537 struct sockaddr_in6 *sin6; 538 struct sctp_nets *r_net; 539 struct timeval tv; 540 int req_prim = 0; 541 542 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 543 /* Invalid length */ 544 return; 545 } 546 sin = (struct sockaddr_in *)&store; 547 sin6 = (struct sockaddr_in6 *)&store; 548 549 memset(&store, 0, sizeof(store)); 550 if (cp->heartbeat.hb_info.addr_family == AF_INET && 551 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 552 sin->sin_family = cp->heartbeat.hb_info.addr_family; 553 sin->sin_len = cp->heartbeat.hb_info.addr_len; 554 sin->sin_port = stcb->rport; 555 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 556 sizeof(sin->sin_addr)); 557 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 558 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 559 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 560 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 561 sin6->sin6_port = stcb->rport; 562 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 563 sizeof(sin6->sin6_addr)); 564 } else { 565 return; 566 } 567 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 568 if (r_net == NULL) { 569 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 570 return; 571 } 572 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 573 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 574 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 575 /* 576 * If the its a HB and it's random value is correct when can 577 * confirm the destination. 578 */ 579 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 580 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 581 stcb->asoc.primary_destination = r_net; 582 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 583 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 584 r_net = TAILQ_FIRST(&stcb->asoc.nets); 585 if (r_net != stcb->asoc.primary_destination) { 586 /* 587 * first one on the list is NOT the primary 588 * sctp_cmpaddr() is much more efficent if 589 * the primary is the first on the list, 590 * make it so. 591 */ 592 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 593 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 594 } 595 req_prim = 1; 596 } 597 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 598 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 599 } 600 r_net->error_count = 0; 601 r_net->hb_responded = 1; 602 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 603 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 604 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 605 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 606 r_net->dest_state |= SCTP_ADDR_REACHABLE; 607 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 608 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 609 /* now was it the primary? if so restore */ 610 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 611 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 612 } 613 } 614 /* 615 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 616 * set the destination to active state and set the cwnd to one or 617 * two MTU's based on whether PF1 or PF2 is being used. If a T3 618 * timer is running, for the destination, stop the timer because a 619 * PF-heartbeat was received. 620 */ 621 if ((stcb->asoc.sctp_cmt_on_off == 1) && 622 (stcb->asoc.sctp_cmt_pf > 0) && 623 ((net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF)) { 624 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 625 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 626 stcb, net, 627 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 628 } 629 net->dest_state &= ~SCTP_ADDR_PF; 630 net->cwnd = net->mtu * stcb->asoc.sctp_cmt_pf; 631 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 632 net, net->cwnd); 633 } 634 /* Now lets do a RTO with this */ 635 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 636 /* Mobility adaptation */ 637 if (req_prim) { 638 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 639 SCTP_MOBILITY_BASE) || 640 sctp_is_mobility_feature_on(stcb->sctp_ep, 641 SCTP_MOBILITY_FASTHANDOFF)) && 642 sctp_is_mobility_feature_on(stcb->sctp_ep, 643 SCTP_MOBILITY_PRIM_DELETED)) { 644 645 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 646 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 647 SCTP_MOBILITY_FASTHANDOFF)) { 648 sctp_assoc_immediate_retrans(stcb, 649 stcb->asoc.primary_destination); 650 } 651 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE)) { 653 sctp_move_chunks_from_deleted_prim(stcb, 654 stcb->asoc.primary_destination); 655 } 656 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 657 stcb->asoc.deleted_primary); 658 } 659 } 660} 661 662static int 663sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 664{ 665 /* 666 * return 0 means we want you to proceed with the abort non-zero 667 * means no abort processing 668 */ 669 struct sctpasochead *head; 670 671 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 672 /* generate a new vtag and send init */ 673 LIST_REMOVE(stcb, sctp_asocs); 674 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 675 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 676 /* 677 * put it in the bucket in the vtag hash of assoc's for the 678 * system 679 */ 680 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 681 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 682 return (1); 683 } 684 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 685 /* 686 * treat like a case where the cookie expired i.e.: - dump 687 * current cookie. - generate a new vtag. - resend init. 688 */ 689 /* generate a new vtag and send init */ 690 LIST_REMOVE(stcb, sctp_asocs); 691 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 692 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 693 sctp_stop_all_cookie_timers(stcb); 694 sctp_toss_old_cookies(stcb, &stcb->asoc); 695 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 696 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 697 /* 698 * put it in the bucket in the vtag hash of assoc's for the 699 * system 700 */ 701 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 702 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 703 return (1); 704 } 705 return (0); 706} 707 708static int 709sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 710 struct sctp_nets *net) 711{ 712 /* 713 * return 0 means we want you to proceed with the abort non-zero 714 * means no abort processing 715 */ 716 if (stcb->asoc.peer_supports_auth == 0) { 717 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 718 return (0); 719 } 720 sctp_asconf_send_nat_state_update(stcb, net); 721 return (1); 722} 723 724 725static void 726sctp_handle_abort(struct sctp_abort_chunk *cp, 727 struct sctp_tcb *stcb, struct sctp_nets *net) 728{ 729#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 730 struct socket *so; 731 732#endif 733 uint16_t len; 734 735 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 736 if (stcb == NULL) 737 return; 738 739 len = ntohs(cp->ch.chunk_length); 740 if (len > sizeof(struct sctp_chunkhdr)) { 741 /* 742 * Need to check the cause codes for our two magic nat 743 * aborts which don't kill the assoc necessarily. 744 */ 745 struct sctp_abort_chunk *cpnext; 746 struct sctp_missing_nat_state *natc; 747 uint16_t cause; 748 749 cpnext = cp; 750 cpnext++; 751 natc = (struct sctp_missing_nat_state *)cpnext; 752 cause = ntohs(natc->cause); 753 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 754 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 755 cp->ch.chunk_flags); 756 if (sctp_handle_nat_colliding_state(stcb)) { 757 return; 758 } 759 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 760 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 761 cp->ch.chunk_flags); 762 if (sctp_handle_nat_missing_state(stcb, net)) { 763 return; 764 } 765 } 766 } 767 /* stop any receive timers */ 768 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 769 /* notify user of the abort and clean up... */ 770 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 771 /* free the tcb */ 772#if defined(SCTP_PANIC_ON_ABORT) 773 printf("stcb:%p state:%d rport:%d net:%p\n", 774 stcb, stcb->asoc.state, stcb->rport, net); 775 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 776 panic("Received an ABORT"); 777 } else { 778 printf("No panic its in state %x closed\n", stcb->asoc.state); 779 } 780#endif 781 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 782 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 783 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 784 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 785 } 786#ifdef SCTP_ASOCLOG_OF_TSNS 787 sctp_print_out_track_log(stcb); 788#endif 789#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 790 so = SCTP_INP_SO(stcb->sctp_ep); 791 atomic_add_int(&stcb->asoc.refcnt, 1); 792 SCTP_TCB_UNLOCK(stcb); 793 SCTP_SOCKET_LOCK(so, 1); 794 SCTP_TCB_LOCK(stcb); 795 atomic_subtract_int(&stcb->asoc.refcnt, 1); 796#endif 797 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 800#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 801 SCTP_SOCKET_UNLOCK(so, 1); 802#endif 803 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 804} 805 806static void 807sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 808 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 809{ 810 struct sctp_association *asoc; 811 int some_on_streamwheel; 812 813#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 814 struct socket *so; 815 816#endif 817 818 SCTPDBG(SCTP_DEBUG_INPUT2, 819 "sctp_handle_shutdown: handling SHUTDOWN\n"); 820 if (stcb == NULL) 821 return; 822 asoc = &stcb->asoc; 823 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 824 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 825 return; 826 } 827 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 828 /* Shutdown NOT the expected size */ 829 return; 830 } else { 831 sctp_update_acked(stcb, cp, net, abort_flag); 832 if (*abort_flag) { 833 return; 834 } 835 } 836 if (asoc->control_pdapi) { 837 /* 838 * With a normal shutdown we assume the end of last record. 839 */ 840 SCTP_INP_READ_LOCK(stcb->sctp_ep); 841 asoc->control_pdapi->end_added = 1; 842 asoc->control_pdapi->pdapi_aborted = 1; 843 asoc->control_pdapi = NULL; 844 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 845#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 846 so = SCTP_INP_SO(stcb->sctp_ep); 847 atomic_add_int(&stcb->asoc.refcnt, 1); 848 SCTP_TCB_UNLOCK(stcb); 849 SCTP_SOCKET_LOCK(so, 1); 850 SCTP_TCB_LOCK(stcb); 851 atomic_subtract_int(&stcb->asoc.refcnt, 1); 852 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 853 /* assoc was freed while we were unlocked */ 854 SCTP_SOCKET_UNLOCK(so, 1); 855 return; 856 } 857#endif 858 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 859#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 860 SCTP_SOCKET_UNLOCK(so, 1); 861#endif 862 } 863 /* goto SHUTDOWN_RECEIVED state to block new requests */ 864 if (stcb->sctp_socket) { 865 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 866 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 867 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 868 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 869 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 870 /* 871 * notify upper layer that peer has initiated a 872 * shutdown 873 */ 874 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 875 876 /* reset time */ 877 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 878 } 879 } 880 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 881 /* 882 * stop the shutdown timer, since we WILL move to 883 * SHUTDOWN-ACK-SENT. 884 */ 885 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 886 } 887 /* Now is there unsent data on a stream somewhere? */ 888 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 889 890 if (!TAILQ_EMPTY(&asoc->send_queue) || 891 !TAILQ_EMPTY(&asoc->sent_queue) || 892 some_on_streamwheel) { 893 /* By returning we will push more data out */ 894 return; 895 } else { 896 /* no outstanding data to send, so move on... */ 897 /* send SHUTDOWN-ACK */ 898 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 899 /* move to SHUTDOWN-ACK-SENT state */ 900 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 901 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 902 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 903 } 904 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 905 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 906 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 907 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 908 /* start SHUTDOWN timer */ 909 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 910 stcb, net); 911 } 912} 913 914static void 915sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 916 struct sctp_tcb *stcb, 917 struct sctp_nets *net) 918{ 919 struct sctp_association *asoc; 920 921#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 922 struct socket *so; 923 924 so = SCTP_INP_SO(stcb->sctp_ep); 925#endif 926 SCTPDBG(SCTP_DEBUG_INPUT2, 927 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 928 if (stcb == NULL) 929 return; 930 931 asoc = &stcb->asoc; 932 /* process according to association state */ 933 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 934 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 935 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 936 sctp_send_shutdown_complete(stcb, net, 1); 937 SCTP_TCB_UNLOCK(stcb); 938 return; 939 } 940 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 941 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 942 /* unexpected SHUTDOWN-ACK... so ignore... */ 943 SCTP_TCB_UNLOCK(stcb); 944 return; 945 } 946 if (asoc->control_pdapi) { 947 /* 948 * With a normal shutdown we assume the end of last record. 949 */ 950 SCTP_INP_READ_LOCK(stcb->sctp_ep); 951 asoc->control_pdapi->end_added = 1; 952 asoc->control_pdapi->pdapi_aborted = 1; 953 asoc->control_pdapi = NULL; 954 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 955#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 956 atomic_add_int(&stcb->asoc.refcnt, 1); 957 SCTP_TCB_UNLOCK(stcb); 958 SCTP_SOCKET_LOCK(so, 1); 959 SCTP_TCB_LOCK(stcb); 960 atomic_subtract_int(&stcb->asoc.refcnt, 1); 961 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 962 /* assoc was freed while we were unlocked */ 963 SCTP_SOCKET_UNLOCK(so, 1); 964 return; 965 } 966#endif 967 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 968#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 969 SCTP_SOCKET_UNLOCK(so, 1); 970#endif 971 } 972 /* are the queues empty? */ 973 if (!TAILQ_EMPTY(&asoc->send_queue) || 974 !TAILQ_EMPTY(&asoc->sent_queue) || 975 !TAILQ_EMPTY(&asoc->out_wheel)) { 976 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 977 } 978 /* stop the timer */ 979 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 980 /* send SHUTDOWN-COMPLETE */ 981 sctp_send_shutdown_complete(stcb, net, 0); 982 /* notify upper layer protocol */ 983 if (stcb->sctp_socket) { 984 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 985 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 986 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 987 /* Set the connected flag to disconnected */ 988 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 989 } 990 } 991 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 992 /* free the TCB but first save off the ep */ 993#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 994 atomic_add_int(&stcb->asoc.refcnt, 1); 995 SCTP_TCB_UNLOCK(stcb); 996 SCTP_SOCKET_LOCK(so, 1); 997 SCTP_TCB_LOCK(stcb); 998 atomic_subtract_int(&stcb->asoc.refcnt, 1); 999#endif 1000 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1001 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1002#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1003 SCTP_SOCKET_UNLOCK(so, 1); 1004#endif 1005} 1006 1007/* 1008 * Skip past the param header and then we will find the chunk that caused the 1009 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1010 * our peer must be broken. 1011 */ 1012static void 1013sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1014 struct sctp_nets *net) 1015{ 1016 struct sctp_chunkhdr *chk; 1017 1018 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1019 switch (chk->chunk_type) { 1020 case SCTP_ASCONF_ACK: 1021 case SCTP_ASCONF: 1022 sctp_asconf_cleanup(stcb, net); 1023 break; 1024 case SCTP_FORWARD_CUM_TSN: 1025 stcb->asoc.peer_supports_prsctp = 0; 1026 break; 1027 default: 1028 SCTPDBG(SCTP_DEBUG_INPUT2, 1029 "Peer does not support chunk type %d(%x)??\n", 1030 chk->chunk_type, (uint32_t) chk->chunk_type); 1031 break; 1032 } 1033} 1034 1035/* 1036 * Skip past the param header and then we will find the param that caused the 1037 * problem. There are a number of param's in a ASCONF OR the prsctp param 1038 * these will turn of specific features. 1039 */ 1040static void 1041sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1042{ 1043 struct sctp_paramhdr *pbad; 1044 1045 pbad = phdr + 1; 1046 switch (ntohs(pbad->param_type)) { 1047 /* pr-sctp draft */ 1048 case SCTP_PRSCTP_SUPPORTED: 1049 stcb->asoc.peer_supports_prsctp = 0; 1050 break; 1051 case SCTP_SUPPORTED_CHUNK_EXT: 1052 break; 1053 /* draft-ietf-tsvwg-addip-sctp */ 1054 case SCTP_HAS_NAT_SUPPORT: 1055 stcb->asoc.peer_supports_nat = 0; 1056 break; 1057 case SCTP_ECN_NONCE_SUPPORTED: 1058 stcb->asoc.peer_supports_ecn_nonce = 0; 1059 stcb->asoc.ecn_nonce_allowed = 0; 1060 stcb->asoc.ecn_allowed = 0; 1061 break; 1062 case SCTP_ADD_IP_ADDRESS: 1063 case SCTP_DEL_IP_ADDRESS: 1064 case SCTP_SET_PRIM_ADDR: 1065 stcb->asoc.peer_supports_asconf = 0; 1066 break; 1067 case SCTP_SUCCESS_REPORT: 1068 case SCTP_ERROR_CAUSE_IND: 1069 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1070 SCTPDBG(SCTP_DEBUG_INPUT2, 1071 "Turning off ASCONF to this strange peer\n"); 1072 stcb->asoc.peer_supports_asconf = 0; 1073 break; 1074 default: 1075 SCTPDBG(SCTP_DEBUG_INPUT2, 1076 "Peer does not support param type %d(%x)??\n", 1077 pbad->param_type, (uint32_t) pbad->param_type); 1078 break; 1079 } 1080} 1081 1082static int 1083sctp_handle_error(struct sctp_chunkhdr *ch, 1084 struct sctp_tcb *stcb, struct sctp_nets *net) 1085{ 1086 int chklen; 1087 struct sctp_paramhdr *phdr; 1088 uint16_t error_type; 1089 uint16_t error_len; 1090 struct sctp_association *asoc; 1091 int adjust; 1092 1093#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1094 struct socket *so; 1095 1096#endif 1097 1098 /* parse through all of the errors and process */ 1099 asoc = &stcb->asoc; 1100 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1101 sizeof(struct sctp_chunkhdr)); 1102 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1103 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1104 /* Process an Error Cause */ 1105 error_type = ntohs(phdr->param_type); 1106 error_len = ntohs(phdr->param_length); 1107 if ((error_len > chklen) || (error_len == 0)) { 1108 /* invalid param length for this param */ 1109 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1110 chklen, error_len); 1111 return (0); 1112 } 1113 switch (error_type) { 1114 case SCTP_CAUSE_INVALID_STREAM: 1115 case SCTP_CAUSE_MISSING_PARAM: 1116 case SCTP_CAUSE_INVALID_PARAM: 1117 case SCTP_CAUSE_NO_USER_DATA: 1118 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1119 error_type); 1120 break; 1121 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1122 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1123 ch->chunk_flags); 1124 if (sctp_handle_nat_colliding_state(stcb)) { 1125 return (0); 1126 } 1127 break; 1128 case SCTP_CAUSE_NAT_MISSING_STATE: 1129 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1130 ch->chunk_flags); 1131 if (sctp_handle_nat_missing_state(stcb, net)) { 1132 return (0); 1133 } 1134 break; 1135 case SCTP_CAUSE_STALE_COOKIE: 1136 /* 1137 * We only act if we have echoed a cookie and are 1138 * waiting. 1139 */ 1140 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1141 int *p; 1142 1143 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1144 /* Save the time doubled */ 1145 asoc->cookie_preserve_req = ntohl(*p) << 1; 1146 asoc->stale_cookie_count++; 1147 if (asoc->stale_cookie_count > 1148 asoc->max_init_times) { 1149 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1150 /* now free the asoc */ 1151#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1152 so = SCTP_INP_SO(stcb->sctp_ep); 1153 atomic_add_int(&stcb->asoc.refcnt, 1); 1154 SCTP_TCB_UNLOCK(stcb); 1155 SCTP_SOCKET_LOCK(so, 1); 1156 SCTP_TCB_LOCK(stcb); 1157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1158#endif 1159 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1160 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1161#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1162 SCTP_SOCKET_UNLOCK(so, 1); 1163#endif 1164 return (-1); 1165 } 1166 /* blast back to INIT state */ 1167 sctp_toss_old_cookies(stcb, &stcb->asoc); 1168 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1169 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1170 sctp_stop_all_cookie_timers(stcb); 1171 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1172 } 1173 break; 1174 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1175 /* 1176 * Nothing we can do here, we don't do hostname 1177 * addresses so if the peer does not like my IPv6 1178 * (or IPv4 for that matter) it does not matter. If 1179 * they don't support that type of address, they can 1180 * NOT possibly get that packet type... i.e. with no 1181 * IPv6 you can't recieve a IPv6 packet. so we can 1182 * safely ignore this one. If we ever added support 1183 * for HOSTNAME Addresses, then we would need to do 1184 * something here. 1185 */ 1186 break; 1187 case SCTP_CAUSE_UNRECOG_CHUNK: 1188 sctp_process_unrecog_chunk(stcb, phdr, net); 1189 break; 1190 case SCTP_CAUSE_UNRECOG_PARAM: 1191 sctp_process_unrecog_param(stcb, phdr); 1192 break; 1193 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1194 /* 1195 * We ignore this since the timer will drive out a 1196 * new cookie anyway and there timer will drive us 1197 * to send a SHUTDOWN_COMPLETE. We can't send one 1198 * here since we don't have their tag. 1199 */ 1200 break; 1201 case SCTP_CAUSE_DELETING_LAST_ADDR: 1202 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1203 case SCTP_CAUSE_DELETING_SRC_ADDR: 1204 /* 1205 * We should NOT get these here, but in a 1206 * ASCONF-ACK. 1207 */ 1208 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1209 error_type); 1210 break; 1211 case SCTP_CAUSE_OUT_OF_RESC: 1212 /* 1213 * And what, pray tell do we do with the fact that 1214 * the peer is out of resources? Not really sure we 1215 * could do anything but abort. I suspect this 1216 * should have came WITH an abort instead of in a 1217 * OP-ERROR. 1218 */ 1219 break; 1220 default: 1221 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1222 error_type); 1223 break; 1224 } 1225 adjust = SCTP_SIZE32(error_len); 1226 chklen -= adjust; 1227 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1228 } 1229 return (0); 1230} 1231 1232static int 1233sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1234 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1235 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1236{ 1237 struct sctp_init_ack *init_ack; 1238 struct mbuf *op_err; 1239 1240 SCTPDBG(SCTP_DEBUG_INPUT2, 1241 "sctp_handle_init_ack: handling INIT-ACK\n"); 1242 1243 if (stcb == NULL) { 1244 SCTPDBG(SCTP_DEBUG_INPUT2, 1245 "sctp_handle_init_ack: TCB is null\n"); 1246 return (-1); 1247 } 1248 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1249 /* Invalid length */ 1250 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1251 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1252 op_err, 0, net->port); 1253 *abort_no_unlock = 1; 1254 return (-1); 1255 } 1256 init_ack = &cp->init; 1257 /* validate parameters */ 1258 if (init_ack->initiate_tag == 0) { 1259 /* protocol error... send an abort */ 1260 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1261 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1262 op_err, 0, net->port); 1263 *abort_no_unlock = 1; 1264 return (-1); 1265 } 1266 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1267 /* protocol error... send an abort */ 1268 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1269 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1270 op_err, 0, net->port); 1271 *abort_no_unlock = 1; 1272 return (-1); 1273 } 1274 if (init_ack->num_inbound_streams == 0) { 1275 /* protocol error... send an abort */ 1276 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1277 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1278 op_err, 0, net->port); 1279 *abort_no_unlock = 1; 1280 return (-1); 1281 } 1282 if (init_ack->num_outbound_streams == 0) { 1283 /* protocol error... send an abort */ 1284 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1285 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1286 op_err, 0, net->port); 1287 *abort_no_unlock = 1; 1288 return (-1); 1289 } 1290 /* process according to association state... */ 1291 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1292 case SCTP_STATE_COOKIE_WAIT: 1293 /* this is the expected state for this chunk */ 1294 /* process the INIT-ACK parameters */ 1295 if (stcb->asoc.primary_destination->dest_state & 1296 SCTP_ADDR_UNCONFIRMED) { 1297 /* 1298 * The primary is where we sent the INIT, we can 1299 * always consider it confirmed when the INIT-ACK is 1300 * returned. Do this before we load addresses 1301 * though. 1302 */ 1303 stcb->asoc.primary_destination->dest_state &= 1304 ~SCTP_ADDR_UNCONFIRMED; 1305 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1306 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1307 } 1308 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1309 net, abort_no_unlock, vrf_id) < 0) { 1310 /* error in parsing parameters */ 1311 return (-1); 1312 } 1313 /* update our state */ 1314 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1315 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1316 1317 /* reset the RTO calc */ 1318 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1319 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1320 stcb->asoc.overall_error_count, 1321 0, 1322 SCTP_FROM_SCTP_INPUT, 1323 __LINE__); 1324 } 1325 stcb->asoc.overall_error_count = 0; 1326 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1327 /* 1328 * collapse the init timer back in case of a exponential 1329 * backoff 1330 */ 1331 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1332 stcb, net); 1333 /* 1334 * the send at the end of the inbound data processing will 1335 * cause the cookie to be sent 1336 */ 1337 break; 1338 case SCTP_STATE_SHUTDOWN_SENT: 1339 /* incorrect state... discard */ 1340 break; 1341 case SCTP_STATE_COOKIE_ECHOED: 1342 /* incorrect state... discard */ 1343 break; 1344 case SCTP_STATE_OPEN: 1345 /* incorrect state... discard */ 1346 break; 1347 case SCTP_STATE_EMPTY: 1348 case SCTP_STATE_INUSE: 1349 default: 1350 /* incorrect state... discard */ 1351 return (-1); 1352 break; 1353 } 1354 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1355 return (0); 1356} 1357 1358static struct sctp_tcb * 1359sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1360 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1361 struct sctp_inpcb *inp, struct sctp_nets **netp, 1362 struct sockaddr *init_src, int *notification, 1363 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1364 uint32_t vrf_id, uint16_t port); 1365 1366 1367/* 1368 * handle a state cookie for an existing association m: input packet mbuf 1369 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1370 * "split" mbuf and the cookie signature does not exist offset: offset into 1371 * mbuf to the cookie-echo chunk 1372 */ 1373static struct sctp_tcb * 1374sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1375 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1376 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1377 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1378 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1379{ 1380 struct sctp_association *asoc; 1381 struct sctp_init_chunk *init_cp, init_buf; 1382 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1383 struct sctp_nets *net; 1384 struct mbuf *op_err; 1385 struct sctp_paramhdr *ph; 1386 int chk_length; 1387 int init_offset, initack_offset, i; 1388 int retval; 1389 int spec_flag = 0; 1390 uint32_t how_indx; 1391 1392 net = *netp; 1393 /* I know that the TCB is non-NULL from the caller */ 1394 asoc = &stcb->asoc; 1395 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1396 if (asoc->cookie_how[how_indx] == 0) 1397 break; 1398 } 1399 if (how_indx < sizeof(asoc->cookie_how)) { 1400 asoc->cookie_how[how_indx] = 1; 1401 } 1402 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1403 /* SHUTDOWN came in after sending INIT-ACK */ 1404 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1405 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1406 0, M_DONTWAIT, 1, MT_DATA); 1407 if (op_err == NULL) { 1408 /* FOOBAR */ 1409 return (NULL); 1410 } 1411 /* Set the len */ 1412 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1413 ph = mtod(op_err, struct sctp_paramhdr *); 1414 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1415 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1416 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1417 vrf_id, net->port); 1418 if (how_indx < sizeof(asoc->cookie_how)) 1419 asoc->cookie_how[how_indx] = 2; 1420 return (NULL); 1421 } 1422 /* 1423 * find and validate the INIT chunk in the cookie (peer's info) the 1424 * INIT should start after the cookie-echo header struct (chunk 1425 * header, state cookie header struct) 1426 */ 1427 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1428 1429 init_cp = (struct sctp_init_chunk *) 1430 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1431 (uint8_t *) & init_buf); 1432 if (init_cp == NULL) { 1433 /* could not pull a INIT chunk in cookie */ 1434 return (NULL); 1435 } 1436 chk_length = ntohs(init_cp->ch.chunk_length); 1437 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1438 return (NULL); 1439 } 1440 /* 1441 * find and validate the INIT-ACK chunk in the cookie (my info) the 1442 * INIT-ACK follows the INIT chunk 1443 */ 1444 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1445 initack_cp = (struct sctp_init_ack_chunk *) 1446 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1447 (uint8_t *) & initack_buf); 1448 if (initack_cp == NULL) { 1449 /* could not pull INIT-ACK chunk in cookie */ 1450 return (NULL); 1451 } 1452 chk_length = ntohs(initack_cp->ch.chunk_length); 1453 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1454 return (NULL); 1455 } 1456 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1457 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1458 /* 1459 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1460 * to get into the OPEN state 1461 */ 1462 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1463 /*- 1464 * Opps, this means that we somehow generated two vtag's 1465 * the same. I.e. we did: 1466 * Us Peer 1467 * <---INIT(tag=a)------ 1468 * ----INIT-ACK(tag=t)--> 1469 * ----INIT(tag=t)------> *1 1470 * <---INIT-ACK(tag=a)--- 1471 * <----CE(tag=t)------------- *2 1472 * 1473 * At point *1 we should be generating a different 1474 * tag t'. Which means we would throw away the CE and send 1475 * ours instead. Basically this is case C (throw away side). 1476 */ 1477 if (how_indx < sizeof(asoc->cookie_how)) 1478 asoc->cookie_how[how_indx] = 17; 1479 return (NULL); 1480 1481 } 1482 switch SCTP_GET_STATE 1483 (asoc) { 1484 case SCTP_STATE_COOKIE_WAIT: 1485 case SCTP_STATE_COOKIE_ECHOED: 1486 /* 1487 * INIT was sent but got a COOKIE_ECHO with the 1488 * correct tags... just accept it...but we must 1489 * process the init so that we can make sure we have 1490 * the right seq no's. 1491 */ 1492 /* First we must process the INIT !! */ 1493 retval = sctp_process_init(init_cp, stcb, net); 1494 if (retval < 0) { 1495 if (how_indx < sizeof(asoc->cookie_how)) 1496 asoc->cookie_how[how_indx] = 3; 1497 return (NULL); 1498 } 1499 /* we have already processed the INIT so no problem */ 1500 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1501 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1502 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1503 /* update current state */ 1504 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1505 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1506 else 1507 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1508 1509 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1510 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1511 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1512 stcb->sctp_ep, stcb, asoc->primary_destination); 1513 } 1514 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1515 sctp_stop_all_cookie_timers(stcb); 1516 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1517 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1518 (inp->sctp_socket->so_qlimit == 0) 1519 ) { 1520#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1521 struct socket *so; 1522 1523#endif 1524 /* 1525 * Here is where collision would go if we 1526 * did a connect() and instead got a 1527 * init/init-ack/cookie done before the 1528 * init-ack came back.. 1529 */ 1530 stcb->sctp_ep->sctp_flags |= 1531 SCTP_PCB_FLAGS_CONNECTED; 1532#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1533 so = SCTP_INP_SO(stcb->sctp_ep); 1534 atomic_add_int(&stcb->asoc.refcnt, 1); 1535 SCTP_TCB_UNLOCK(stcb); 1536 SCTP_SOCKET_LOCK(so, 1); 1537 SCTP_TCB_LOCK(stcb); 1538 atomic_add_int(&stcb->asoc.refcnt, -1); 1539 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1540 SCTP_SOCKET_UNLOCK(so, 1); 1541 return (NULL); 1542 } 1543#endif 1544 soisconnected(stcb->sctp_socket); 1545#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1546 SCTP_SOCKET_UNLOCK(so, 1); 1547#endif 1548 } 1549 /* notify upper layer */ 1550 *notification = SCTP_NOTIFY_ASSOC_UP; 1551 /* 1552 * since we did not send a HB make sure we don't 1553 * double things 1554 */ 1555 net->hb_responded = 1; 1556 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1557 &cookie->time_entered, sctp_align_unsafe_makecopy); 1558 1559 if (stcb->asoc.sctp_autoclose_ticks && 1560 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1561 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1562 inp, stcb, NULL); 1563 } 1564 break; 1565 default: 1566 /* 1567 * we're in the OPEN state (or beyond), so peer must 1568 * have simply lost the COOKIE-ACK 1569 */ 1570 break; 1571 } /* end switch */ 1572 sctp_stop_all_cookie_timers(stcb); 1573 /* 1574 * We ignore the return code here.. not sure if we should 1575 * somehow abort.. but we do have an existing asoc. This 1576 * really should not fail. 1577 */ 1578 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1579 init_offset + sizeof(struct sctp_init_chunk), 1580 initack_offset, sh, init_src)) { 1581 if (how_indx < sizeof(asoc->cookie_how)) 1582 asoc->cookie_how[how_indx] = 4; 1583 return (NULL); 1584 } 1585 /* respond with a COOKIE-ACK */ 1586 sctp_toss_old_cookies(stcb, asoc); 1587 sctp_send_cookie_ack(stcb); 1588 if (how_indx < sizeof(asoc->cookie_how)) 1589 asoc->cookie_how[how_indx] = 5; 1590 return (stcb); 1591 } 1592 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1593 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1594 cookie->tie_tag_my_vtag == 0 && 1595 cookie->tie_tag_peer_vtag == 0) { 1596 /* 1597 * case C in Section 5.2.4 Table 2: XMOO silently discard 1598 */ 1599 if (how_indx < sizeof(asoc->cookie_how)) 1600 asoc->cookie_how[how_indx] = 6; 1601 return (NULL); 1602 } 1603 /* 1604 * If nat support, and the below and stcb is established, send back 1605 * a ABORT(colliding state) if we are established. 1606 */ 1607 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1608 (asoc->peer_supports_nat) && 1609 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1610 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1611 (asoc->peer_vtag == 0)))) { 1612 /* 1613 * Special case - Peer's support nat. We may have two init's 1614 * that we gave out the same tag on since one was not 1615 * established.. i.e. we get INIT from host-1 behind the nat 1616 * and we respond tag-a, we get a INIT from host-2 behind 1617 * the nat and we get tag-a again. Then we bring up host-1 1618 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1619 * Now we have colliding state. We must send an abort here 1620 * with colliding state indication. 1621 */ 1622 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1623 0, M_DONTWAIT, 1, MT_DATA); 1624 if (op_err == NULL) { 1625 /* FOOBAR */ 1626 return (NULL); 1627 } 1628 /* pre-reserve some space */ 1629#ifdef INET6 1630 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1631#else 1632 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1633#endif 1634 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1635 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1636 /* Set the len */ 1637 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1638 ph = mtod(op_err, struct sctp_paramhdr *); 1639 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1640 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1641 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1642 return (NULL); 1643 } 1644 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1645 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1646 (asoc->peer_vtag == 0))) { 1647 /* 1648 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1649 * should be ok, re-accept peer info 1650 */ 1651 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1652 /* 1653 * Extension of case C. If we hit this, then the 1654 * random number generator returned the same vtag 1655 * when we first sent our INIT-ACK and when we later 1656 * sent our INIT. The side with the seq numbers that 1657 * are different will be the one that normnally 1658 * would have hit case C. This in effect "extends" 1659 * our vtags in this collision case to be 64 bits. 1660 * The same collision could occur aka you get both 1661 * vtag and seq number the same twice in a row.. but 1662 * is much less likely. If it did happen then we 1663 * would proceed through and bring up the assoc.. we 1664 * may end up with the wrong stream setup however.. 1665 * which would be bad.. but there is no way to 1666 * tell.. until we send on a stream that does not 1667 * exist :-) 1668 */ 1669 if (how_indx < sizeof(asoc->cookie_how)) 1670 asoc->cookie_how[how_indx] = 7; 1671 1672 return (NULL); 1673 } 1674 if (how_indx < sizeof(asoc->cookie_how)) 1675 asoc->cookie_how[how_indx] = 8; 1676 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1677 sctp_stop_all_cookie_timers(stcb); 1678 /* 1679 * since we did not send a HB make sure we don't double 1680 * things 1681 */ 1682 net->hb_responded = 1; 1683 if (stcb->asoc.sctp_autoclose_ticks && 1684 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1685 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1686 NULL); 1687 } 1688 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1689 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1690 1691 /* Note last_cwr_tsn? where is this used? */ 1692 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1693 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1694 /* 1695 * Ok the peer probably discarded our data (if we 1696 * echoed a cookie+data). So anything on the 1697 * sent_queue should be marked for retransmit, we 1698 * may not get something to kick us so it COULD 1699 * still take a timeout to move these.. but it can't 1700 * hurt to mark them. 1701 */ 1702 struct sctp_tmit_chunk *chk; 1703 1704 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1705 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1706 chk->sent = SCTP_DATAGRAM_RESEND; 1707 sctp_flight_size_decrease(chk); 1708 sctp_total_flight_decrease(stcb, chk); 1709 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1710 spec_flag++; 1711 } 1712 } 1713 1714 } 1715 /* process the INIT info (peer's info) */ 1716 retval = sctp_process_init(init_cp, stcb, net); 1717 if (retval < 0) { 1718 if (how_indx < sizeof(asoc->cookie_how)) 1719 asoc->cookie_how[how_indx] = 9; 1720 return (NULL); 1721 } 1722 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1723 init_offset + sizeof(struct sctp_init_chunk), 1724 initack_offset, sh, init_src)) { 1725 if (how_indx < sizeof(asoc->cookie_how)) 1726 asoc->cookie_how[how_indx] = 10; 1727 return (NULL); 1728 } 1729 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1730 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1731 *notification = SCTP_NOTIFY_ASSOC_UP; 1732 1733 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1734 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1735 (inp->sctp_socket->so_qlimit == 0)) { 1736#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1737 struct socket *so; 1738 1739#endif 1740 stcb->sctp_ep->sctp_flags |= 1741 SCTP_PCB_FLAGS_CONNECTED; 1742#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1743 so = SCTP_INP_SO(stcb->sctp_ep); 1744 atomic_add_int(&stcb->asoc.refcnt, 1); 1745 SCTP_TCB_UNLOCK(stcb); 1746 SCTP_SOCKET_LOCK(so, 1); 1747 SCTP_TCB_LOCK(stcb); 1748 atomic_add_int(&stcb->asoc.refcnt, -1); 1749 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1750 SCTP_SOCKET_UNLOCK(so, 1); 1751 return (NULL); 1752 } 1753#endif 1754 soisconnected(stcb->sctp_socket); 1755#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1756 SCTP_SOCKET_UNLOCK(so, 1); 1757#endif 1758 } 1759 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1760 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1761 else 1762 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1763 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1764 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1765 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1766 } else { 1767 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1768 } 1769 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1770 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1771 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1772 stcb->sctp_ep, stcb, asoc->primary_destination); 1773 } 1774 sctp_stop_all_cookie_timers(stcb); 1775 sctp_toss_old_cookies(stcb, asoc); 1776 sctp_send_cookie_ack(stcb); 1777 if (spec_flag) { 1778 /* 1779 * only if we have retrans set do we do this. What 1780 * this call does is get only the COOKIE-ACK out and 1781 * then when we return the normal call to 1782 * sctp_chunk_output will get the retrans out behind 1783 * this. 1784 */ 1785 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1786 } 1787 if (how_indx < sizeof(asoc->cookie_how)) 1788 asoc->cookie_how[how_indx] = 11; 1789 1790 return (stcb); 1791 } 1792 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1793 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1794 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1795 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1796 cookie->tie_tag_peer_vtag != 0) { 1797 struct sctpasochead *head; 1798 1799 if (asoc->peer_supports_nat) { 1800 /* 1801 * This is a gross gross hack. just call the 1802 * cookie_new code since we are allowing a duplicate 1803 * association. I hope this works... 1804 */ 1805 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1806 inp, netp, init_src, notification, 1807 auth_skipped, auth_offset, auth_len, 1808 vrf_id, port)); 1809 } 1810 /* 1811 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1812 */ 1813 /* temp code */ 1814 if (how_indx < sizeof(asoc->cookie_how)) 1815 asoc->cookie_how[how_indx] = 12; 1816 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1817 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1818 1819 *sac_assoc_id = sctp_get_associd(stcb); 1820 /* notify upper layer */ 1821 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1822 atomic_add_int(&stcb->asoc.refcnt, 1); 1823 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1824 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1825 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1826 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1827 } 1828 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1829 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1830 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1831 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1832 } 1833 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1834 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1835 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1836 stcb->sctp_ep, stcb, asoc->primary_destination); 1837 1838 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1839 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1840 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1841 } 1842 asoc->pre_open_streams = 1843 ntohs(initack_cp->init.num_outbound_streams); 1844 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1845 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1846 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1847 1848 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1849 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1850 1851 asoc->str_reset_seq_in = asoc->init_seq_number; 1852 1853 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1854 if (asoc->mapping_array) { 1855 memset(asoc->mapping_array, 0, 1856 asoc->mapping_array_size); 1857 } 1858 if (asoc->nr_mapping_array) { 1859 memset(asoc->nr_mapping_array, 0, 1860 asoc->mapping_array_size); 1861 } 1862 SCTP_TCB_UNLOCK(stcb); 1863 SCTP_INP_INFO_WLOCK(); 1864 SCTP_INP_WLOCK(stcb->sctp_ep); 1865 SCTP_TCB_LOCK(stcb); 1866 atomic_add_int(&stcb->asoc.refcnt, -1); 1867 /* send up all the data */ 1868 SCTP_TCB_SEND_LOCK(stcb); 1869 1870 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1871 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1872 stcb->asoc.strmout[i].stream_no = i; 1873 stcb->asoc.strmout[i].next_sequence_sent = 0; 1874 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1875 } 1876 /* process the INIT-ACK info (my info) */ 1877 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1878 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1879 1880 /* pull from vtag hash */ 1881 LIST_REMOVE(stcb, sctp_asocs); 1882 /* re-insert to new vtag position */ 1883 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1884 SCTP_BASE_INFO(hashasocmark))]; 1885 /* 1886 * put it in the bucket in the vtag hash of assoc's for the 1887 * system 1888 */ 1889 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1890 1891 /* process the INIT info (peer's info) */ 1892 SCTP_TCB_SEND_UNLOCK(stcb); 1893 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1894 SCTP_INP_INFO_WUNLOCK(); 1895 1896 retval = sctp_process_init(init_cp, stcb, net); 1897 if (retval < 0) { 1898 if (how_indx < sizeof(asoc->cookie_how)) 1899 asoc->cookie_how[how_indx] = 13; 1900 1901 return (NULL); 1902 } 1903 /* 1904 * since we did not send a HB make sure we don't double 1905 * things 1906 */ 1907 net->hb_responded = 1; 1908 1909 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1910 init_offset + sizeof(struct sctp_init_chunk), 1911 initack_offset, sh, init_src)) { 1912 if (how_indx < sizeof(asoc->cookie_how)) 1913 asoc->cookie_how[how_indx] = 14; 1914 1915 return (NULL); 1916 } 1917 /* respond with a COOKIE-ACK */ 1918 sctp_stop_all_cookie_timers(stcb); 1919 sctp_toss_old_cookies(stcb, asoc); 1920 sctp_send_cookie_ack(stcb); 1921 if (how_indx < sizeof(asoc->cookie_how)) 1922 asoc->cookie_how[how_indx] = 15; 1923 1924 return (stcb); 1925 } 1926 if (how_indx < sizeof(asoc->cookie_how)) 1927 asoc->cookie_how[how_indx] = 16; 1928 /* all other cases... */ 1929 return (NULL); 1930} 1931 1932 1933/* 1934 * handle a state cookie for a new association m: input packet mbuf chain-- 1935 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1936 * and the cookie signature does not exist offset: offset into mbuf to the 1937 * cookie-echo chunk length: length of the cookie chunk to: where the init 1938 * was from returns a new TCB 1939 */ 1940struct sctp_tcb * 1941sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1942 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1943 struct sctp_inpcb *inp, struct sctp_nets **netp, 1944 struct sockaddr *init_src, int *notification, 1945 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1946 uint32_t vrf_id, uint16_t port) 1947{ 1948 struct sctp_tcb *stcb; 1949 struct sctp_init_chunk *init_cp, init_buf; 1950 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1951 struct sockaddr_storage sa_store; 1952 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1953 struct sockaddr_in *sin; 1954 struct sockaddr_in6 *sin6; 1955 struct sctp_association *asoc; 1956 int chk_length; 1957 int init_offset, initack_offset, initack_limit; 1958 int retval; 1959 int error = 0; 1960 uint32_t old_tag; 1961 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1962 1963#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1964 struct socket *so; 1965 1966 so = SCTP_INP_SO(inp); 1967#endif 1968 1969 /* 1970 * find and validate the INIT chunk in the cookie (peer's info) the 1971 * INIT should start after the cookie-echo header struct (chunk 1972 * header, state cookie header struct) 1973 */ 1974 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1975 init_cp = (struct sctp_init_chunk *) 1976 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1977 (uint8_t *) & init_buf); 1978 if (init_cp == NULL) { 1979 /* could not pull a INIT chunk in cookie */ 1980 SCTPDBG(SCTP_DEBUG_INPUT1, 1981 "process_cookie_new: could not pull INIT chunk hdr\n"); 1982 return (NULL); 1983 } 1984 chk_length = ntohs(init_cp->ch.chunk_length); 1985 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1986 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1987 return (NULL); 1988 } 1989 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1990 /* 1991 * find and validate the INIT-ACK chunk in the cookie (my info) the 1992 * INIT-ACK follows the INIT chunk 1993 */ 1994 initack_cp = (struct sctp_init_ack_chunk *) 1995 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1996 (uint8_t *) & initack_buf); 1997 if (initack_cp == NULL) { 1998 /* could not pull INIT-ACK chunk in cookie */ 1999 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2000 return (NULL); 2001 } 2002 chk_length = ntohs(initack_cp->ch.chunk_length); 2003 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2004 return (NULL); 2005 } 2006 /* 2007 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2008 * "initack_limit" value. This is because the chk_length field 2009 * includes the length of the cookie, but the cookie is omitted when 2010 * the INIT and INIT_ACK are tacked onto the cookie... 2011 */ 2012 initack_limit = offset + cookie_len; 2013 2014 /* 2015 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2016 * and popluate 2017 */ 2018 2019 /* 2020 * Here we do a trick, we set in NULL for the proc/thread argument. 2021 * We do this since in effect we only use the p argument when the 2022 * socket is unbound and we must do an implicit bind. Since we are 2023 * getting a cookie, we cannot be unbound. 2024 */ 2025 stcb = sctp_aloc_assoc(inp, init_src, &error, 2026 ntohl(initack_cp->init.initiate_tag), vrf_id, 2027 (struct thread *)NULL 2028 ); 2029 if (stcb == NULL) { 2030 struct mbuf *op_err; 2031 2032 /* memory problem? */ 2033 SCTPDBG(SCTP_DEBUG_INPUT1, 2034 "process_cookie_new: no room for another TCB!\n"); 2035 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2036 2037 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2038 sh, op_err, vrf_id, port); 2039 return (NULL); 2040 } 2041 /* get the correct sctp_nets */ 2042 if (netp) 2043 *netp = sctp_findnet(stcb, init_src); 2044 2045 asoc = &stcb->asoc; 2046 /* get scope variables out of cookie */ 2047 asoc->ipv4_local_scope = cookie->ipv4_scope; 2048 asoc->site_scope = cookie->site_scope; 2049 asoc->local_scope = cookie->local_scope; 2050 asoc->loopback_scope = cookie->loopback_scope; 2051 2052 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2053 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2054 struct mbuf *op_err; 2055 2056 /* 2057 * Houston we have a problem. The EP changed while the 2058 * cookie was in flight. Only recourse is to abort the 2059 * association. 2060 */ 2061 atomic_add_int(&stcb->asoc.refcnt, 1); 2062 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2063 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2064 sh, op_err, vrf_id, port); 2065#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2066 SCTP_TCB_UNLOCK(stcb); 2067 SCTP_SOCKET_LOCK(so, 1); 2068 SCTP_TCB_LOCK(stcb); 2069#endif 2070 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2071 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2072#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2073 SCTP_SOCKET_UNLOCK(so, 1); 2074#endif 2075 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2076 return (NULL); 2077 } 2078 /* process the INIT-ACK info (my info) */ 2079 old_tag = asoc->my_vtag; 2080 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2081 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2082 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2083 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2084 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2085 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2086 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2087 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2088 asoc->str_reset_seq_in = asoc->init_seq_number; 2089 2090 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2091 2092 /* process the INIT info (peer's info) */ 2093 if (netp) 2094 retval = sctp_process_init(init_cp, stcb, *netp); 2095 else 2096 retval = 0; 2097 if (retval < 0) { 2098 atomic_add_int(&stcb->asoc.refcnt, 1); 2099#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2100 SCTP_TCB_UNLOCK(stcb); 2101 SCTP_SOCKET_LOCK(so, 1); 2102 SCTP_TCB_LOCK(stcb); 2103#endif 2104 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2105#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2106 SCTP_SOCKET_UNLOCK(so, 1); 2107#endif 2108 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2109 return (NULL); 2110 } 2111 /* load all addresses */ 2112 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2113 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2114 init_src)) { 2115 atomic_add_int(&stcb->asoc.refcnt, 1); 2116#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2117 SCTP_TCB_UNLOCK(stcb); 2118 SCTP_SOCKET_LOCK(so, 1); 2119 SCTP_TCB_LOCK(stcb); 2120#endif 2121 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2122#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2123 SCTP_SOCKET_UNLOCK(so, 1); 2124#endif 2125 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2126 return (NULL); 2127 } 2128 /* 2129 * verify any preceding AUTH chunk that was skipped 2130 */ 2131 /* pull the local authentication parameters from the cookie/init-ack */ 2132 sctp_auth_get_cookie_params(stcb, m, 2133 initack_offset + sizeof(struct sctp_init_ack_chunk), 2134 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2135 if (auth_skipped) { 2136 struct sctp_auth_chunk *auth; 2137 2138 auth = (struct sctp_auth_chunk *) 2139 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2140 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2141 /* auth HMAC failed, dump the assoc and packet */ 2142 SCTPDBG(SCTP_DEBUG_AUTH1, 2143 "COOKIE-ECHO: AUTH failed\n"); 2144 atomic_add_int(&stcb->asoc.refcnt, 1); 2145#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2146 SCTP_TCB_UNLOCK(stcb); 2147 SCTP_SOCKET_LOCK(so, 1); 2148 SCTP_TCB_LOCK(stcb); 2149#endif 2150 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2151#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2152 SCTP_SOCKET_UNLOCK(so, 1); 2153#endif 2154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2155 return (NULL); 2156 } else { 2157 /* remaining chunks checked... good to go */ 2158 stcb->asoc.authenticated = 1; 2159 } 2160 } 2161 /* update current state */ 2162 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2163 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2164 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2165 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2166 stcb->sctp_ep, stcb, asoc->primary_destination); 2167 } 2168 sctp_stop_all_cookie_timers(stcb); 2169 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2170 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2171 2172 /* 2173 * if we're doing ASCONFs, check to see if we have any new local 2174 * addresses that need to get added to the peer (eg. addresses 2175 * changed while cookie echo in flight). This needs to be done 2176 * after we go to the OPEN state to do the correct asconf 2177 * processing. else, make sure we have the correct addresses in our 2178 * lists 2179 */ 2180 2181 /* warning, we re-use sin, sin6, sa_store here! */ 2182 /* pull in local_address (our "from" address) */ 2183 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2184 /* source addr is IPv4 */ 2185 sin = (struct sockaddr_in *)initack_src; 2186 memset(sin, 0, sizeof(*sin)); 2187 sin->sin_family = AF_INET; 2188 sin->sin_len = sizeof(struct sockaddr_in); 2189 sin->sin_addr.s_addr = cookie->laddress[0]; 2190 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2191 /* source addr is IPv6 */ 2192 sin6 = (struct sockaddr_in6 *)initack_src; 2193 memset(sin6, 0, sizeof(*sin6)); 2194 sin6->sin6_family = AF_INET6; 2195 sin6->sin6_len = sizeof(struct sockaddr_in6); 2196 sin6->sin6_scope_id = cookie->scope_id; 2197 memcpy(&sin6->sin6_addr, cookie->laddress, 2198 sizeof(sin6->sin6_addr)); 2199 } else { 2200 atomic_add_int(&stcb->asoc.refcnt, 1); 2201#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_TCB_UNLOCK(stcb); 2203 SCTP_SOCKET_LOCK(so, 1); 2204 SCTP_TCB_LOCK(stcb); 2205#endif 2206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2207#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 SCTP_SOCKET_UNLOCK(so, 1); 2209#endif 2210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2211 return (NULL); 2212 } 2213 2214 /* set up to notify upper layer */ 2215 *notification = SCTP_NOTIFY_ASSOC_UP; 2216 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2217 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2218 (inp->sctp_socket->so_qlimit == 0)) { 2219 /* 2220 * This is an endpoint that called connect() how it got a 2221 * cookie that is NEW is a bit of a mystery. It must be that 2222 * the INIT was sent, but before it got there.. a complete 2223 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2224 * should have went to the other code.. not here.. oh well.. 2225 * a bit of protection is worth having.. 2226 */ 2227 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2228#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2229 atomic_add_int(&stcb->asoc.refcnt, 1); 2230 SCTP_TCB_UNLOCK(stcb); 2231 SCTP_SOCKET_LOCK(so, 1); 2232 SCTP_TCB_LOCK(stcb); 2233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2234 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2235 SCTP_SOCKET_UNLOCK(so, 1); 2236 return (NULL); 2237 } 2238#endif 2239 soisconnected(stcb->sctp_socket); 2240#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2241 SCTP_SOCKET_UNLOCK(so, 1); 2242#endif 2243 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2244 (inp->sctp_socket->so_qlimit)) { 2245 /* 2246 * We don't want to do anything with this one. Since it is 2247 * the listening guy. The timer will get started for 2248 * accepted connections in the caller. 2249 */ 2250 ; 2251 } 2252 /* since we did not send a HB make sure we don't double things */ 2253 if ((netp) && (*netp)) 2254 (*netp)->hb_responded = 1; 2255 2256 if (stcb->asoc.sctp_autoclose_ticks && 2257 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2258 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2259 } 2260 /* calculate the RTT */ 2261 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2262 if ((netp) && (*netp)) { 2263 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2264 &cookie->time_entered, sctp_align_unsafe_makecopy); 2265 } 2266 /* respond with a COOKIE-ACK */ 2267 sctp_send_cookie_ack(stcb); 2268 2269 /* 2270 * check the address lists for any ASCONFs that need to be sent 2271 * AFTER the cookie-ack is sent 2272 */ 2273 sctp_check_address_list(stcb, m, 2274 initack_offset + sizeof(struct sctp_init_ack_chunk), 2275 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2276 initack_src, cookie->local_scope, cookie->site_scope, 2277 cookie->ipv4_scope, cookie->loopback_scope); 2278 2279 2280 return (stcb); 2281} 2282 2283/* 2284 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2285 * we NEED to make sure we are not already using the vtag. If so we 2286 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2287 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2288 SCTP_BASE_INFO(hashasocmark))]; 2289 LIST_FOREACH(stcb, head, sctp_asocs) { 2290 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2291 -- SEND ABORT - TRY AGAIN -- 2292 } 2293 } 2294*/ 2295 2296/* 2297 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2298 * existing (non-NULL) TCB 2299 */ 2300static struct mbuf * 2301sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2302 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2303 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2304 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2305 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2306{ 2307 struct sctp_state_cookie *cookie; 2308 struct sockaddr_in6 sin6; 2309 struct sockaddr_in sin; 2310 struct sctp_tcb *l_stcb = *stcb; 2311 struct sctp_inpcb *l_inp; 2312 struct sockaddr *to; 2313 sctp_assoc_t sac_restart_id; 2314 struct sctp_pcb *ep; 2315 struct mbuf *m_sig; 2316 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2317 uint8_t *sig; 2318 uint8_t cookie_ok = 0; 2319 unsigned int size_of_pkt, sig_offset, cookie_offset; 2320 unsigned int cookie_len; 2321 struct timeval now; 2322 struct timeval time_expires; 2323 struct sockaddr_storage dest_store; 2324 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2325 struct ip *iph; 2326 int notification = 0; 2327 struct sctp_nets *netl; 2328 int had_a_existing_tcb = 0; 2329 2330 SCTPDBG(SCTP_DEBUG_INPUT2, 2331 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2332 2333 if (inp_p == NULL) { 2334 return (NULL); 2335 } 2336 /* First get the destination address setup too. */ 2337 iph = mtod(m, struct ip *); 2338 switch (iph->ip_v) { 2339 case IPVERSION: 2340 { 2341 /* its IPv4 */ 2342 struct sockaddr_in *lsin; 2343 2344 lsin = (struct sockaddr_in *)(localep_sa); 2345 memset(lsin, 0, sizeof(*lsin)); 2346 lsin->sin_family = AF_INET; 2347 lsin->sin_len = sizeof(*lsin); 2348 lsin->sin_port = sh->dest_port; 2349 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2350 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2351 break; 2352 } 2353#ifdef INET6 2354 case IPV6_VERSION >> 4: 2355 { 2356 /* its IPv6 */ 2357 struct ip6_hdr *ip6; 2358 struct sockaddr_in6 *lsin6; 2359 2360 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2361 memset(lsin6, 0, sizeof(*lsin6)); 2362 lsin6->sin6_family = AF_INET6; 2363 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2364 ip6 = mtod(m, struct ip6_hdr *); 2365 lsin6->sin6_port = sh->dest_port; 2366 lsin6->sin6_addr = ip6->ip6_dst; 2367 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2368 break; 2369 } 2370#endif 2371 default: 2372 return (NULL); 2373 } 2374 2375 cookie = &cp->cookie; 2376 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2377 cookie_len = ntohs(cp->ch.chunk_length); 2378 2379 if ((cookie->peerport != sh->src_port) && 2380 (cookie->myport != sh->dest_port) && 2381 (cookie->my_vtag != sh->v_tag)) { 2382 /* 2383 * invalid ports or bad tag. Note that we always leave the 2384 * v_tag in the header in network order and when we stored 2385 * it in the my_vtag slot we also left it in network order. 2386 * This maintains the match even though it may be in the 2387 * opposite byte order of the machine :-> 2388 */ 2389 return (NULL); 2390 } 2391 if (cookie_len > size_of_pkt || 2392 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2393 sizeof(struct sctp_init_chunk) + 2394 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2395 /* cookie too long! or too small */ 2396 return (NULL); 2397 } 2398 /* 2399 * split off the signature into its own mbuf (since it should not be 2400 * calculated in the sctp_hmac_m() call). 2401 */ 2402 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2403 if (sig_offset > size_of_pkt) { 2404 /* packet not correct size! */ 2405 /* XXX this may already be accounted for earlier... */ 2406 return (NULL); 2407 } 2408 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2409 if (m_sig == NULL) { 2410 /* out of memory or ?? */ 2411 return (NULL); 2412 } 2413#ifdef SCTP_MBUF_LOGGING 2414 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2415 struct mbuf *mat; 2416 2417 mat = m_sig; 2418 while (mat) { 2419 if (SCTP_BUF_IS_EXTENDED(mat)) { 2420 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2421 } 2422 mat = SCTP_BUF_NEXT(mat); 2423 } 2424 } 2425#endif 2426 2427 /* 2428 * compute the signature/digest for the cookie 2429 */ 2430 ep = &(*inp_p)->sctp_ep; 2431 l_inp = *inp_p; 2432 if (l_stcb) { 2433 SCTP_TCB_UNLOCK(l_stcb); 2434 } 2435 SCTP_INP_RLOCK(l_inp); 2436 if (l_stcb) { 2437 SCTP_TCB_LOCK(l_stcb); 2438 } 2439 /* which cookie is it? */ 2440 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2441 (ep->current_secret_number != ep->last_secret_number)) { 2442 /* it's the old cookie */ 2443 (void)sctp_hmac_m(SCTP_HMAC, 2444 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2445 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2446 } else { 2447 /* it's the current cookie */ 2448 (void)sctp_hmac_m(SCTP_HMAC, 2449 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2450 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2451 } 2452 /* get the signature */ 2453 SCTP_INP_RUNLOCK(l_inp); 2454 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2455 if (sig == NULL) { 2456 /* couldn't find signature */ 2457 sctp_m_freem(m_sig); 2458 return (NULL); 2459 } 2460 /* compare the received digest with the computed digest */ 2461 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2462 /* try the old cookie? */ 2463 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2464 (ep->current_secret_number != ep->last_secret_number)) { 2465 /* compute digest with old */ 2466 (void)sctp_hmac_m(SCTP_HMAC, 2467 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2468 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2469 /* compare */ 2470 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2471 cookie_ok = 1; 2472 } 2473 } else { 2474 cookie_ok = 1; 2475 } 2476 2477 /* 2478 * Now before we continue we must reconstruct our mbuf so that 2479 * normal processing of any other chunks will work. 2480 */ 2481 { 2482 struct mbuf *m_at; 2483 2484 m_at = m; 2485 while (SCTP_BUF_NEXT(m_at) != NULL) { 2486 m_at = SCTP_BUF_NEXT(m_at); 2487 } 2488 SCTP_BUF_NEXT(m_at) = m_sig; 2489 } 2490 2491 if (cookie_ok == 0) { 2492 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2493 SCTPDBG(SCTP_DEBUG_INPUT2, 2494 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2495 (uint32_t) offset, cookie_offset, sig_offset); 2496 return (NULL); 2497 } 2498 /* 2499 * check the cookie timestamps to be sure it's not stale 2500 */ 2501 (void)SCTP_GETTIME_TIMEVAL(&now); 2502 /* Expire time is in Ticks, so we convert to seconds */ 2503 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2504 time_expires.tv_usec = cookie->time_entered.tv_usec; 2505 /* 2506 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2507 * is undefined. 2508 */ 2509 if (timevalcmp(&now, &time_expires, >)) { 2510 /* cookie is stale! */ 2511 struct mbuf *op_err; 2512 struct sctp_stale_cookie_msg *scm; 2513 uint32_t tim; 2514 2515 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2516 0, M_DONTWAIT, 1, MT_DATA); 2517 if (op_err == NULL) { 2518 /* FOOBAR */ 2519 return (NULL); 2520 } 2521 /* Set the len */ 2522 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2523 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2524 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2525 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2526 (sizeof(uint32_t)))); 2527 /* seconds to usec */ 2528 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2529 /* add in usec */ 2530 if (tim == 0) 2531 tim = now.tv_usec - cookie->time_entered.tv_usec; 2532 scm->time_usec = htonl(tim); 2533 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2534 vrf_id, port); 2535 return (NULL); 2536 } 2537 /* 2538 * Now we must see with the lookup address if we have an existing 2539 * asoc. This will only happen if we were in the COOKIE-WAIT state 2540 * and a INIT collided with us and somewhere the peer sent the 2541 * cookie on another address besides the single address our assoc 2542 * had for him. In this case we will have one of the tie-tags set at 2543 * least AND the address field in the cookie can be used to look it 2544 * up. 2545 */ 2546 to = NULL; 2547 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2548 memset(&sin6, 0, sizeof(sin6)); 2549 sin6.sin6_family = AF_INET6; 2550 sin6.sin6_len = sizeof(sin6); 2551 sin6.sin6_port = sh->src_port; 2552 sin6.sin6_scope_id = cookie->scope_id; 2553 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2554 sizeof(sin6.sin6_addr.s6_addr)); 2555 to = (struct sockaddr *)&sin6; 2556 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2557 memset(&sin, 0, sizeof(sin)); 2558 sin.sin_family = AF_INET; 2559 sin.sin_len = sizeof(sin); 2560 sin.sin_port = sh->src_port; 2561 sin.sin_addr.s_addr = cookie->address[0]; 2562 to = (struct sockaddr *)&sin; 2563 } else { 2564 /* This should not happen */ 2565 return (NULL); 2566 } 2567 if ((*stcb == NULL) && to) { 2568 /* Yep, lets check */ 2569 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2570 if (*stcb == NULL) { 2571 /* 2572 * We should have only got back the same inp. If we 2573 * got back a different ep we have a problem. The 2574 * original findep got back l_inp and now 2575 */ 2576 if (l_inp != *inp_p) { 2577 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2578 } 2579 } else { 2580 if (*locked_tcb == NULL) { 2581 /* 2582 * In this case we found the assoc only 2583 * after we locked the create lock. This 2584 * means we are in a colliding case and we 2585 * must make sure that we unlock the tcb if 2586 * its one of the cases where we throw away 2587 * the incoming packets. 2588 */ 2589 *locked_tcb = *stcb; 2590 2591 /* 2592 * We must also increment the inp ref count 2593 * since the ref_count flags was set when we 2594 * did not find the TCB, now we found it 2595 * which reduces the refcount.. we must 2596 * raise it back out to balance it all :-) 2597 */ 2598 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2599 if ((*stcb)->sctp_ep != l_inp) { 2600 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2601 (*stcb)->sctp_ep, l_inp); 2602 } 2603 } 2604 } 2605 } 2606 if (to == NULL) { 2607 return (NULL); 2608 } 2609 cookie_len -= SCTP_SIGNATURE_SIZE; 2610 if (*stcb == NULL) { 2611 /* this is the "normal" case... get a new TCB */ 2612 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2613 cookie_len, *inp_p, netp, to, ¬ification, 2614 auth_skipped, auth_offset, auth_len, vrf_id, port); 2615 } else { 2616 /* this is abnormal... cookie-echo on existing TCB */ 2617 had_a_existing_tcb = 1; 2618 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2619 cookie, cookie_len, *inp_p, *stcb, netp, to, 2620 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2621 } 2622 2623 if (*stcb == NULL) { 2624 /* still no TCB... must be bad cookie-echo */ 2625 return (NULL); 2626 } 2627 /* 2628 * Ok, we built an association so confirm the address we sent the 2629 * INIT-ACK to. 2630 */ 2631 netl = sctp_findnet(*stcb, to); 2632 /* 2633 * This code should in theory NOT run but 2634 */ 2635 if (netl == NULL) { 2636 /* TSNH! Huh, why do I need to add this address here? */ 2637 int ret; 2638 2639 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2640 SCTP_IN_COOKIE_PROC); 2641 netl = sctp_findnet(*stcb, to); 2642 } 2643 if (netl) { 2644 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2645 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2646 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2647 netl); 2648 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2649 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2650 } 2651 } 2652 if (*stcb) { 2653 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2654 *stcb, NULL); 2655 } 2656 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2657 if (!had_a_existing_tcb || 2658 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2659 /* 2660 * If we have a NEW cookie or the connect never 2661 * reached the connected state during collision we 2662 * must do the TCP accept thing. 2663 */ 2664 struct socket *so, *oso; 2665 struct sctp_inpcb *inp; 2666 2667 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2668 /* 2669 * For a restart we will keep the same 2670 * socket, no need to do anything. I THINK!! 2671 */ 2672 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2673 return (m); 2674 } 2675 oso = (*inp_p)->sctp_socket; 2676 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2677 SCTP_TCB_UNLOCK((*stcb)); 2678 so = sonewconn(oso, 0 2679 ); 2680 SCTP_TCB_LOCK((*stcb)); 2681 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2682 2683 if (so == NULL) { 2684 struct mbuf *op_err; 2685 2686#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2687 struct socket *pcb_so; 2688 2689#endif 2690 /* Too many sockets */ 2691 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2692 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2693 sctp_abort_association(*inp_p, NULL, m, iphlen, 2694 sh, op_err, vrf_id, port); 2695#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2696 pcb_so = SCTP_INP_SO(*inp_p); 2697 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2698 SCTP_TCB_UNLOCK((*stcb)); 2699 SCTP_SOCKET_LOCK(pcb_so, 1); 2700 SCTP_TCB_LOCK((*stcb)); 2701 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2702#endif 2703 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2704#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2705 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2706#endif 2707 return (NULL); 2708 } 2709 inp = (struct sctp_inpcb *)so->so_pcb; 2710 SCTP_INP_INCR_REF(inp); 2711 /* 2712 * We add the unbound flag here so that if we get an 2713 * soabort() before we get the move_pcb done, we 2714 * will properly cleanup. 2715 */ 2716 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2717 SCTP_PCB_FLAGS_CONNECTED | 2718 SCTP_PCB_FLAGS_IN_TCPPOOL | 2719 SCTP_PCB_FLAGS_UNBOUND | 2720 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2721 SCTP_PCB_FLAGS_DONT_WAKE); 2722 inp->sctp_features = (*inp_p)->sctp_features; 2723 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2724 inp->sctp_socket = so; 2725 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2726 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2727 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2728 inp->sctp_context = (*inp_p)->sctp_context; 2729 inp->inp_starting_point_for_iterator = NULL; 2730 /* 2731 * copy in the authentication parameters from the 2732 * original endpoint 2733 */ 2734 if (inp->sctp_ep.local_hmacs) 2735 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2736 inp->sctp_ep.local_hmacs = 2737 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2738 if (inp->sctp_ep.local_auth_chunks) 2739 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2740 inp->sctp_ep.local_auth_chunks = 2741 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2742 2743 /* 2744 * Now we must move it from one hash table to 2745 * another and get the tcb in the right place. 2746 */ 2747 2748 /* 2749 * This is where the one-2-one socket is put into 2750 * the accept state waiting for the accept! 2751 */ 2752 if (*stcb) { 2753 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2754 } 2755 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2756 2757 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2758 SCTP_TCB_UNLOCK((*stcb)); 2759 2760 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2761 0); 2762 SCTP_TCB_LOCK((*stcb)); 2763 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2764 2765 2766 /* 2767 * now we must check to see if we were aborted while 2768 * the move was going on and the lock/unlock 2769 * happened. 2770 */ 2771 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2772 /* 2773 * yep it was, we leave the assoc attached 2774 * to the socket since the sctp_inpcb_free() 2775 * call will send an abort for us. 2776 */ 2777 SCTP_INP_DECR_REF(inp); 2778 return (NULL); 2779 } 2780 SCTP_INP_DECR_REF(inp); 2781 /* Switch over to the new guy */ 2782 *inp_p = inp; 2783 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2784 2785 /* 2786 * Pull it from the incomplete queue and wake the 2787 * guy 2788 */ 2789#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2790 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2791 SCTP_TCB_UNLOCK((*stcb)); 2792 SCTP_SOCKET_LOCK(so, 1); 2793#endif 2794 soisconnected(so); 2795#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2796 SCTP_TCB_LOCK((*stcb)); 2797 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2798 SCTP_SOCKET_UNLOCK(so, 1); 2799#endif 2800 return (m); 2801 } 2802 } 2803 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2804 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2805 } 2806 return (m); 2807} 2808 2809static void 2810sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2811 struct sctp_tcb *stcb, struct sctp_nets *net) 2812{ 2813 /* cp must not be used, others call this without a c-ack :-) */ 2814 struct sctp_association *asoc; 2815 2816 SCTPDBG(SCTP_DEBUG_INPUT2, 2817 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2818 if (stcb == NULL) 2819 return; 2820 2821 asoc = &stcb->asoc; 2822 2823 sctp_stop_all_cookie_timers(stcb); 2824 /* process according to association state */ 2825 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2826 /* state change only needed when I am in right state */ 2827 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2828 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2829 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2830 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2831 stcb->sctp_ep, stcb, asoc->primary_destination); 2832 2833 } 2834 /* update RTO */ 2835 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2836 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2837 if (asoc->overall_error_count == 0) { 2838 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2839 &asoc->time_entered, sctp_align_safe_nocopy); 2840 } 2841 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2842 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2843 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2844 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2845#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2846 struct socket *so; 2847 2848#endif 2849 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2850#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2851 so = SCTP_INP_SO(stcb->sctp_ep); 2852 atomic_add_int(&stcb->asoc.refcnt, 1); 2853 SCTP_TCB_UNLOCK(stcb); 2854 SCTP_SOCKET_LOCK(so, 1); 2855 SCTP_TCB_LOCK(stcb); 2856 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2857 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2858 SCTP_SOCKET_UNLOCK(so, 1); 2859 return; 2860 } 2861#endif 2862 soisconnected(stcb->sctp_socket); 2863#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2864 SCTP_SOCKET_UNLOCK(so, 1); 2865#endif 2866 } 2867 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2868 stcb, net); 2869 /* 2870 * since we did not send a HB make sure we don't double 2871 * things 2872 */ 2873 net->hb_responded = 1; 2874 2875 if (stcb->asoc.sctp_autoclose_ticks && 2876 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2877 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2878 stcb->sctp_ep, stcb, NULL); 2879 } 2880 /* 2881 * send ASCONF if parameters are pending and ASCONFs are 2882 * allowed (eg. addresses changed when init/cookie echo were 2883 * in flight) 2884 */ 2885 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2886 (stcb->asoc.peer_supports_asconf) && 2887 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2888#ifdef SCTP_TIMER_BASED_ASCONF 2889 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2890 stcb->sctp_ep, stcb, 2891 stcb->asoc.primary_destination); 2892#else 2893 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2894 SCTP_ADDR_NOT_LOCKED); 2895#endif 2896 } 2897 } 2898 /* Toss the cookie if I can */ 2899 sctp_toss_old_cookies(stcb, asoc); 2900 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2901 /* Restart the timer if we have pending data */ 2902 struct sctp_tmit_chunk *chk; 2903 2904 chk = TAILQ_FIRST(&asoc->sent_queue); 2905 if (chk) { 2906 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2907 stcb, chk->whoTo); 2908 } 2909 } 2910} 2911 2912static void 2913sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2914 struct sctp_tcb *stcb) 2915{ 2916 struct sctp_nets *net; 2917 struct sctp_tmit_chunk *lchk; 2918 uint32_t tsn; 2919 2920 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2921 return; 2922 } 2923 SCTP_STAT_INCR(sctps_recvecne); 2924 tsn = ntohl(cp->tsn); 2925 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2926 /* Also we make sure we disable the nonce_wait */ 2927 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2928 if (lchk == NULL) { 2929 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2930 } else { 2931 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2932 } 2933 stcb->asoc.nonce_wait_for_ecne = 0; 2934 stcb->asoc.nonce_sum_check = 0; 2935 2936 /* Find where it was sent, if possible */ 2937 net = NULL; 2938 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2939 while (lchk) { 2940 if (lchk->rec.data.TSN_seq == tsn) { 2941 net = lchk->whoTo; 2942 break; 2943 } 2944 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2945 break; 2946 lchk = TAILQ_NEXT(lchk, sctp_next); 2947 } 2948 if (net == NULL) 2949 /* default is we use the primary */ 2950 net = stcb->asoc.primary_destination; 2951 2952 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2953 /* 2954 * JRS - Use the congestion control given in the pluggable 2955 * CC module 2956 */ 2957 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2958 /* 2959 * we reduce once every RTT. So we will only lower cwnd at 2960 * the next sending seq i.e. the resync_tsn. 2961 */ 2962 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2963 } 2964 /* 2965 * We always send a CWR this way if our previous one was lost our 2966 * peer will get an update, or if it is not time again to reduce we 2967 * still get the cwr to the peer. 2968 */ 2969 sctp_send_cwr(stcb, net, tsn); 2970} 2971 2972static void 2973sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2974{ 2975 /* 2976 * Here we get a CWR from the peer. We must look in the outqueue and 2977 * make sure that we have a covered ECNE in teh control chunk part. 2978 * If so remove it. 2979 */ 2980 struct sctp_tmit_chunk *chk; 2981 struct sctp_ecne_chunk *ecne; 2982 2983 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2984 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2985 continue; 2986 } 2987 /* 2988 * Look for and remove if it is the right TSN. Since there 2989 * is only ONE ECNE on the control queue at any one time we 2990 * don't need to worry about more than one! 2991 */ 2992 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2993 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2994 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2995 /* this covers this ECNE, we can remove it */ 2996 stcb->asoc.ecn_echo_cnt_onq--; 2997 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2998 sctp_next); 2999 if (chk->data) { 3000 sctp_m_freem(chk->data); 3001 chk->data = NULL; 3002 } 3003 stcb->asoc.ctrl_queue_cnt--; 3004 sctp_free_a_chunk(stcb, chk); 3005 break; 3006 } 3007 } 3008} 3009 3010static void 3011sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 3012 struct sctp_tcb *stcb, struct sctp_nets *net) 3013{ 3014 struct sctp_association *asoc; 3015 3016#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3017 struct socket *so; 3018 3019#endif 3020 3021 SCTPDBG(SCTP_DEBUG_INPUT2, 3022 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3023 if (stcb == NULL) 3024 return; 3025 3026 asoc = &stcb->asoc; 3027 /* process according to association state */ 3028 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3029 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3030 SCTPDBG(SCTP_DEBUG_INPUT2, 3031 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3032 SCTP_TCB_UNLOCK(stcb); 3033 return; 3034 } 3035 /* notify upper layer protocol */ 3036 if (stcb->sctp_socket) { 3037 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3038 /* are the queues empty? they should be */ 3039 if (!TAILQ_EMPTY(&asoc->send_queue) || 3040 !TAILQ_EMPTY(&asoc->sent_queue) || 3041 !TAILQ_EMPTY(&asoc->out_wheel)) { 3042 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3043 } 3044 } 3045 /* stop the timer */ 3046 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3047 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3048 /* free the TCB */ 3049 SCTPDBG(SCTP_DEBUG_INPUT2, 3050 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3051#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3052 so = SCTP_INP_SO(stcb->sctp_ep); 3053 atomic_add_int(&stcb->asoc.refcnt, 1); 3054 SCTP_TCB_UNLOCK(stcb); 3055 SCTP_SOCKET_LOCK(so, 1); 3056 SCTP_TCB_LOCK(stcb); 3057 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3058#endif 3059 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3060#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3061 SCTP_SOCKET_UNLOCK(so, 1); 3062#endif 3063 return; 3064} 3065 3066static int 3067process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3068 struct sctp_nets *net, uint8_t flg) 3069{ 3070 switch (desc->chunk_type) { 3071 case SCTP_DATA: 3072 /* find the tsn to resend (possibly */ 3073 { 3074 uint32_t tsn; 3075 struct sctp_tmit_chunk *tp1; 3076 3077 tsn = ntohl(desc->tsn_ifany); 3078 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3079 while (tp1) { 3080 if (tp1->rec.data.TSN_seq == tsn) { 3081 /* found it */ 3082 break; 3083 } 3084 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3085 MAX_TSN)) { 3086 /* not found */ 3087 tp1 = NULL; 3088 break; 3089 } 3090 tp1 = TAILQ_NEXT(tp1, sctp_next); 3091 } 3092 if (tp1 == NULL) { 3093 /* 3094 * Do it the other way , aka without paying 3095 * attention to queue seq order. 3096 */ 3097 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3098 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3099 while (tp1) { 3100 if (tp1->rec.data.TSN_seq == tsn) { 3101 /* found it */ 3102 break; 3103 } 3104 tp1 = TAILQ_NEXT(tp1, sctp_next); 3105 } 3106 } 3107 if (tp1 == NULL) { 3108 SCTP_STAT_INCR(sctps_pdrptsnnf); 3109 } 3110 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3111 uint8_t *ddp; 3112 3113 if ((stcb->asoc.peers_rwnd == 0) && 3114 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3115 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3116 return (0); 3117 } 3118 if (stcb->asoc.peers_rwnd == 0 && 3119 (flg & SCTP_FROM_MIDDLE_BOX)) { 3120 SCTP_STAT_INCR(sctps_pdrpdizrw); 3121 return (0); 3122 } 3123 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3124 sizeof(struct sctp_data_chunk)); 3125 { 3126 unsigned int iii; 3127 3128 for (iii = 0; iii < sizeof(desc->data_bytes); 3129 iii++) { 3130 if (ddp[iii] != desc->data_bytes[iii]) { 3131 SCTP_STAT_INCR(sctps_pdrpbadd); 3132 return (-1); 3133 } 3134 } 3135 } 3136 /* 3137 * We zero out the nonce so resync not 3138 * needed 3139 */ 3140 tp1->rec.data.ect_nonce = 0; 3141 3142 if (tp1->do_rtt) { 3143 /* 3144 * this guy had a RTO calculation 3145 * pending on it, cancel it 3146 */ 3147 tp1->do_rtt = 0; 3148 } 3149 SCTP_STAT_INCR(sctps_pdrpmark); 3150 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3151 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3152 tp1->sent = SCTP_DATAGRAM_RESEND; 3153 /* 3154 * mark it as if we were doing a FR, since 3155 * we will be getting gap ack reports behind 3156 * the info from the router. 3157 */ 3158 tp1->rec.data.doing_fast_retransmit = 1; 3159 /* 3160 * mark the tsn with what sequences can 3161 * cause a new FR. 3162 */ 3163 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3164 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3165 } else { 3166 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3167 } 3168 3169 /* restart the timer */ 3170 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3171 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3172 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3173 stcb, tp1->whoTo); 3174 3175 /* fix counts and things */ 3176 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3177 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3178 tp1->whoTo->flight_size, 3179 tp1->book_size, 3180 (uintptr_t) stcb, 3181 tp1->rec.data.TSN_seq); 3182 } 3183 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3184 sctp_flight_size_decrease(tp1); 3185 sctp_total_flight_decrease(stcb, tp1); 3186 } 3187 } { 3188 /* audit code */ 3189 unsigned int audit; 3190 3191 audit = 0; 3192 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3193 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3194 audit++; 3195 } 3196 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3197 sctp_next) { 3198 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3199 audit++; 3200 } 3201 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3202 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3203 audit, stcb->asoc.sent_queue_retran_cnt); 3204#ifndef SCTP_AUDITING_ENABLED 3205 stcb->asoc.sent_queue_retran_cnt = audit; 3206#endif 3207 } 3208 } 3209 } 3210 break; 3211 case SCTP_ASCONF: 3212 { 3213 struct sctp_tmit_chunk *asconf; 3214 3215 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3216 sctp_next) { 3217 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3218 break; 3219 } 3220 } 3221 if (asconf) { 3222 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3223 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3224 asconf->sent = SCTP_DATAGRAM_RESEND; 3225 asconf->snd_count--; 3226 } 3227 } 3228 break; 3229 case SCTP_INITIATION: 3230 /* resend the INIT */ 3231 stcb->asoc.dropped_special_cnt++; 3232 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3233 /* 3234 * If we can get it in, in a few attempts we do 3235 * this, otherwise we let the timer fire. 3236 */ 3237 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3238 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3239 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3240 } 3241 break; 3242 case SCTP_SELECTIVE_ACK: 3243 case SCTP_NR_SELECTIVE_ACK: 3244 /* resend the sack */ 3245 sctp_send_sack(stcb); 3246 break; 3247 case SCTP_HEARTBEAT_REQUEST: 3248 /* resend a demand HB */ 3249 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3250 /* 3251 * Only retransmit if we KNOW we wont destroy the 3252 * tcb 3253 */ 3254 (void)sctp_send_hb(stcb, 1, net); 3255 } 3256 break; 3257 case SCTP_SHUTDOWN: 3258 sctp_send_shutdown(stcb, net); 3259 break; 3260 case SCTP_SHUTDOWN_ACK: 3261 sctp_send_shutdown_ack(stcb, net); 3262 break; 3263 case SCTP_COOKIE_ECHO: 3264 { 3265 struct sctp_tmit_chunk *cookie; 3266 3267 cookie = NULL; 3268 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3269 sctp_next) { 3270 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3271 break; 3272 } 3273 } 3274 if (cookie) { 3275 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3276 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3277 cookie->sent = SCTP_DATAGRAM_RESEND; 3278 sctp_stop_all_cookie_timers(stcb); 3279 } 3280 } 3281 break; 3282 case SCTP_COOKIE_ACK: 3283 sctp_send_cookie_ack(stcb); 3284 break; 3285 case SCTP_ASCONF_ACK: 3286 /* resend last asconf ack */ 3287 sctp_send_asconf_ack(stcb); 3288 break; 3289 case SCTP_FORWARD_CUM_TSN: 3290 send_forward_tsn(stcb, &stcb->asoc); 3291 break; 3292 /* can't do anything with these */ 3293 case SCTP_PACKET_DROPPED: 3294 case SCTP_INITIATION_ACK: /* this should not happen */ 3295 case SCTP_HEARTBEAT_ACK: 3296 case SCTP_ABORT_ASSOCIATION: 3297 case SCTP_OPERATION_ERROR: 3298 case SCTP_SHUTDOWN_COMPLETE: 3299 case SCTP_ECN_ECHO: 3300 case SCTP_ECN_CWR: 3301 default: 3302 break; 3303 } 3304 return (0); 3305} 3306 3307void 3308sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3309{ 3310 int i; 3311 uint16_t temp; 3312 3313 /* 3314 * We set things to 0xffff since this is the last delivered sequence 3315 * and we will be sending in 0 after the reset. 3316 */ 3317 3318 if (number_entries) { 3319 for (i = 0; i < number_entries; i++) { 3320 temp = ntohs(list[i]); 3321 if (temp >= stcb->asoc.streamincnt) { 3322 continue; 3323 } 3324 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3325 } 3326 } else { 3327 list = NULL; 3328 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3329 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3330 } 3331 } 3332 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3333} 3334 3335static void 3336sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3337{ 3338 int i; 3339 3340 if (number_entries == 0) { 3341 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3342 stcb->asoc.strmout[i].next_sequence_sent = 0; 3343 } 3344 } else if (number_entries) { 3345 for (i = 0; i < number_entries; i++) { 3346 uint16_t temp; 3347 3348 temp = ntohs(list[i]); 3349 if (temp >= stcb->asoc.streamoutcnt) { 3350 /* no such stream */ 3351 continue; 3352 } 3353 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3354 } 3355 } 3356 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3357} 3358 3359 3360struct sctp_stream_reset_out_request * 3361sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3362{ 3363 struct sctp_association *asoc; 3364 struct sctp_stream_reset_out_req *req; 3365 struct sctp_stream_reset_out_request *r; 3366 struct sctp_tmit_chunk *chk; 3367 int len, clen; 3368 3369 asoc = &stcb->asoc; 3370 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3371 asoc->stream_reset_outstanding = 0; 3372 return (NULL); 3373 } 3374 if (stcb->asoc.str_reset == NULL) { 3375 asoc->stream_reset_outstanding = 0; 3376 return (NULL); 3377 } 3378 chk = stcb->asoc.str_reset; 3379 if (chk->data == NULL) { 3380 return (NULL); 3381 } 3382 if (bchk) { 3383 /* he wants a copy of the chk pointer */ 3384 *bchk = chk; 3385 } 3386 clen = chk->send_size; 3387 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3388 r = &req->sr_req; 3389 if (ntohl(r->request_seq) == seq) { 3390 /* found it */ 3391 return (r); 3392 } 3393 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3394 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3395 /* move to the next one, there can only be a max of two */ 3396 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3397 if (ntohl(r->request_seq) == seq) { 3398 return (r); 3399 } 3400 } 3401 /* that seq is not here */ 3402 return (NULL); 3403} 3404 3405static void 3406sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3407{ 3408 struct sctp_association *asoc; 3409 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3410 3411 if (stcb->asoc.str_reset == NULL) { 3412 return; 3413 } 3414 asoc = &stcb->asoc; 3415 3416 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3417 TAILQ_REMOVE(&asoc->control_send_queue, 3418 chk, 3419 sctp_next); 3420 if (chk->data) { 3421 sctp_m_freem(chk->data); 3422 chk->data = NULL; 3423 } 3424 asoc->ctrl_queue_cnt--; 3425 sctp_free_a_chunk(stcb, chk); 3426 /* sa_ignore NO_NULL_CHK */ 3427 stcb->asoc.str_reset = NULL; 3428} 3429 3430 3431static int 3432sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3433 uint32_t seq, uint32_t action, 3434 struct sctp_stream_reset_response *respin) 3435{ 3436 uint16_t type; 3437 int lparm_len; 3438 struct sctp_association *asoc = &stcb->asoc; 3439 struct sctp_tmit_chunk *chk; 3440 struct sctp_stream_reset_out_request *srparam; 3441 int number_entries; 3442 3443 if (asoc->stream_reset_outstanding == 0) { 3444 /* duplicate */ 3445 return (0); 3446 } 3447 if (seq == stcb->asoc.str_reset_seq_out) { 3448 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3449 if (srparam) { 3450 stcb->asoc.str_reset_seq_out++; 3451 type = ntohs(srparam->ph.param_type); 3452 lparm_len = ntohs(srparam->ph.param_length); 3453 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3454 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3455 asoc->stream_reset_out_is_outstanding = 0; 3456 if (asoc->stream_reset_outstanding) 3457 asoc->stream_reset_outstanding--; 3458 if (action == SCTP_STREAM_RESET_PERFORMED) { 3459 /* do it */ 3460 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3461 } else { 3462 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3463 } 3464 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3465 /* Answered my request */ 3466 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3467 if (asoc->stream_reset_outstanding) 3468 asoc->stream_reset_outstanding--; 3469 if (action != SCTP_STREAM_RESET_PERFORMED) { 3470 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3471 } 3472 } else if (type == SCTP_STR_RESET_ADD_STREAMS) { 3473 /* Ok we now may have more streams */ 3474 if (asoc->stream_reset_outstanding) 3475 asoc->stream_reset_outstanding--; 3476 if (action == SCTP_STREAM_RESET_PERFORMED) { 3477 /* Put the new streams into effect */ 3478 stcb->asoc.streamoutcnt = stcb->asoc.strm_realoutsize; 3479 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_OK, stcb, 3480 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3481 } else { 3482 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD_FAIL, stcb, 3483 (uint32_t) stcb->asoc.streamoutcnt, NULL, SCTP_SO_NOT_LOCKED); 3484 } 3485 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3486 /** 3487 * a) Adopt the new in tsn. 3488 * b) reset the map 3489 * c) Adopt the new out-tsn 3490 */ 3491 struct sctp_stream_reset_response_tsn *resp; 3492 struct sctp_forward_tsn_chunk fwdtsn; 3493 int abort_flag = 0; 3494 3495 if (respin == NULL) { 3496 /* huh ? */ 3497 return (0); 3498 } 3499 if (action == SCTP_STREAM_RESET_PERFORMED) { 3500 resp = (struct sctp_stream_reset_response_tsn *)respin; 3501 asoc->stream_reset_outstanding--; 3502 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3503 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3504 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3505 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3506 if (abort_flag) { 3507 return (1); 3508 } 3509 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3510 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3511 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3512 } 3513 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3514 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3515 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3516 3517 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3518 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3519 3520 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3521 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3522 3523 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3524 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3525 3526 } 3527 } 3528 /* get rid of the request and get the request flags */ 3529 if (asoc->stream_reset_outstanding == 0) { 3530 sctp_clean_up_stream_reset(stcb); 3531 } 3532 } 3533 } 3534 return (0); 3535} 3536 3537static void 3538sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3539 struct sctp_tmit_chunk *chk, 3540 struct sctp_stream_reset_in_request *req, int trunc) 3541{ 3542 uint32_t seq; 3543 int len, i; 3544 int number_entries; 3545 uint16_t temp; 3546 3547 /* 3548 * peer wants me to send a str-reset to him for my outgoing seq's if 3549 * seq_in is right. 3550 */ 3551 struct sctp_association *asoc = &stcb->asoc; 3552 3553 seq = ntohl(req->request_seq); 3554 if (asoc->str_reset_seq_in == seq) { 3555 if (trunc) { 3556 /* Can't do it, since they exceeded our buffer size */ 3557 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3558 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3559 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3560 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3561 len = ntohs(req->ph.param_length); 3562 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3563 for (i = 0; i < number_entries; i++) { 3564 temp = ntohs(req->list_of_streams[i]); 3565 req->list_of_streams[i] = temp; 3566 } 3567 /* move the reset action back one */ 3568 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3569 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3570 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3571 asoc->str_reset_seq_out, 3572 seq, (asoc->sending_seq - 1)); 3573 asoc->stream_reset_out_is_outstanding = 1; 3574 asoc->str_reset = chk; 3575 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3576 stcb->asoc.stream_reset_outstanding++; 3577 } else { 3578 /* Can't do it, since we have sent one out */ 3579 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3580 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3581 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3582 } 3583 asoc->str_reset_seq_in++; 3584 } else if (asoc->str_reset_seq_in - 1 == seq) { 3585 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3586 } else if (asoc->str_reset_seq_in - 2 == seq) { 3587 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3588 } else { 3589 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3590 } 3591} 3592 3593static int 3594sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3595 struct sctp_tmit_chunk *chk, 3596 struct sctp_stream_reset_tsn_request *req) 3597{ 3598 /* reset all in and out and update the tsn */ 3599 /* 3600 * A) reset my str-seq's on in and out. B) Select a receive next, 3601 * and set cum-ack to it. Also process this selected number as a 3602 * fwd-tsn as well. C) set in the response my next sending seq. 3603 */ 3604 struct sctp_forward_tsn_chunk fwdtsn; 3605 struct sctp_association *asoc = &stcb->asoc; 3606 int abort_flag = 0; 3607 uint32_t seq; 3608 3609 seq = ntohl(req->request_seq); 3610 if (asoc->str_reset_seq_in == seq) { 3611 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3612 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3613 fwdtsn.ch.chunk_flags = 0; 3614 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3615 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3616 if (abort_flag) { 3617 return (1); 3618 } 3619 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3620 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3621 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3622 } 3623 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3624 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3625 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3626 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3627 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3628 atomic_add_int(&stcb->asoc.sending_seq, 1); 3629 /* save off historical data for retrans */ 3630 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3631 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3632 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3633 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3634 3635 sctp_add_stream_reset_result_tsn(chk, 3636 ntohl(req->request_seq), 3637 SCTP_STREAM_RESET_PERFORMED, 3638 stcb->asoc.sending_seq, 3639 stcb->asoc.mapping_array_base_tsn); 3640 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3641 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3642 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3643 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3644 3645 asoc->str_reset_seq_in++; 3646 } else if (asoc->str_reset_seq_in - 1 == seq) { 3647 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3648 stcb->asoc.last_sending_seq[0], 3649 stcb->asoc.last_base_tsnsent[0] 3650 ); 3651 } else if (asoc->str_reset_seq_in - 2 == seq) { 3652 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3653 stcb->asoc.last_sending_seq[1], 3654 stcb->asoc.last_base_tsnsent[1] 3655 ); 3656 } else { 3657 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3658 } 3659 return (0); 3660} 3661 3662static void 3663sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3664 struct sctp_tmit_chunk *chk, 3665 struct sctp_stream_reset_out_request *req, int trunc) 3666{ 3667 uint32_t seq, tsn; 3668 int number_entries, len; 3669 struct sctp_association *asoc = &stcb->asoc; 3670 3671 seq = ntohl(req->request_seq); 3672 3673 /* now if its not a duplicate we process it */ 3674 if (asoc->str_reset_seq_in == seq) { 3675 len = ntohs(req->ph.param_length); 3676 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3677 /* 3678 * the sender is resetting, handle the list issue.. we must 3679 * a) verify if we can do the reset, if so no problem b) If 3680 * we can't do the reset we must copy the request. c) queue 3681 * it, and setup the data in processor to trigger it off 3682 * when needed and dequeue all the queued data. 3683 */ 3684 tsn = ntohl(req->send_reset_at_tsn); 3685 3686 /* move the reset action back one */ 3687 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3688 if (trunc) { 3689 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3690 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3691 } else if ((tsn == asoc->cumulative_tsn) || 3692 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3693 /* we can do it now */ 3694 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3695 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3696 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3697 } else { 3698 /* 3699 * we must queue it up and thus wait for the TSN's 3700 * to arrive that are at or before tsn 3701 */ 3702 struct sctp_stream_reset_list *liste; 3703 int siz; 3704 3705 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3706 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3707 siz, SCTP_M_STRESET); 3708 if (liste == NULL) { 3709 /* gak out of memory */ 3710 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3711 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3712 return; 3713 } 3714 liste->tsn = tsn; 3715 liste->number_entries = number_entries; 3716 memcpy(&liste->req, req, 3717 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3718 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3719 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3720 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3721 } 3722 asoc->str_reset_seq_in++; 3723 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3724 /* 3725 * one seq back, just echo back last action since my 3726 * response was lost. 3727 */ 3728 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3729 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3730 /* 3731 * two seq back, just echo back last action since my 3732 * response was lost. 3733 */ 3734 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3735 } else { 3736 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3737 } 3738} 3739 3740static void 3741sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3742 struct sctp_stream_reset_add_strm *str_add) 3743{ 3744 /* 3745 * Peer is requesting to add more streams. If its within our 3746 * max-streams we will allow it. 3747 */ 3748 uint16_t num_stream, i; 3749 uint32_t seq; 3750 struct sctp_association *asoc = &stcb->asoc; 3751 struct sctp_queued_to_read *ctl; 3752 3753 /* Get the number. */ 3754 seq = ntohl(str_add->request_seq); 3755 num_stream = ntohs(str_add->number_of_streams); 3756 /* Now what would be the new total? */ 3757 if (asoc->str_reset_seq_in == seq) { 3758 num_stream += stcb->asoc.streamincnt; 3759 if (num_stream > stcb->asoc.max_inbound_streams) { 3760 /* We must reject it they ask for to many */ 3761 denied: 3762 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3763 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3764 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3765 } else { 3766 /* Ok, we can do that :-) */ 3767 struct sctp_stream_in *oldstrm; 3768 3769 /* save off the old */ 3770 oldstrm = stcb->asoc.strmin; 3771 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3772 (num_stream * sizeof(struct sctp_stream_in)), 3773 SCTP_M_STRMI); 3774 if (stcb->asoc.strmin == NULL) { 3775 stcb->asoc.strmin = oldstrm; 3776 goto denied; 3777 } 3778 /* copy off the old data */ 3779 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3780 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3781 stcb->asoc.strmin[i].stream_no = i; 3782 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3783 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3784 /* now anything on those queues? */ 3785 while (TAILQ_EMPTY(&oldstrm[i].inqueue) == 0) { 3786 ctl = TAILQ_FIRST(&oldstrm[i].inqueue); 3787 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3788 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3789 } 3790 } 3791 /* Init the new streams */ 3792 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3793 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3794 stcb->asoc.strmin[i].stream_no = i; 3795 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3796 stcb->asoc.strmin[i].delivery_started = 0; 3797 } 3798 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3799 /* update the size */ 3800 stcb->asoc.streamincnt = num_stream; 3801 /* Send the ack */ 3802 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3803 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3804 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3805 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_INSTREAM_ADD_OK, stcb, 3806 (uint32_t) stcb->asoc.streamincnt, NULL, SCTP_SO_NOT_LOCKED); 3807 } 3808 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3809 /* 3810 * one seq back, just echo back last action since my 3811 * response was lost. 3812 */ 3813 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3814 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3815 /* 3816 * two seq back, just echo back last action since my 3817 * response was lost. 3818 */ 3819 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3820 } else { 3821 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3822 3823 } 3824} 3825 3826#ifdef __GNUC__ 3827__attribute__((noinline)) 3828#endif 3829 static int 3830 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3831 struct sctp_stream_reset_out_req *sr_req) 3832{ 3833 int chk_length, param_len, ptype; 3834 struct sctp_paramhdr pstore; 3835 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3836 3837 uint32_t seq; 3838 int num_req = 0; 3839 int trunc = 0; 3840 struct sctp_tmit_chunk *chk; 3841 struct sctp_chunkhdr *ch; 3842 struct sctp_paramhdr *ph; 3843 int ret_code = 0; 3844 int num_param = 0; 3845 3846 /* now it may be a reset or a reset-response */ 3847 chk_length = ntohs(sr_req->ch.chunk_length); 3848 3849 /* setup for adding the response */ 3850 sctp_alloc_a_chunk(stcb, chk); 3851 if (chk == NULL) { 3852 return (ret_code); 3853 } 3854 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3855 chk->rec.chunk_id.can_take_data = 0; 3856 chk->asoc = &stcb->asoc; 3857 chk->no_fr_allowed = 0; 3858 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3859 chk->book_size_scale = 0; 3860 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3861 if (chk->data == NULL) { 3862strres_nochunk: 3863 if (chk->data) { 3864 sctp_m_freem(chk->data); 3865 chk->data = NULL; 3866 } 3867 sctp_free_a_chunk(stcb, chk); 3868 return (ret_code); 3869 } 3870 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3871 3872 /* setup chunk parameters */ 3873 chk->sent = SCTP_DATAGRAM_UNSENT; 3874 chk->snd_count = 0; 3875 chk->whoTo = stcb->asoc.primary_destination; 3876 atomic_add_int(&chk->whoTo->ref_count, 1); 3877 3878 ch = mtod(chk->data, struct sctp_chunkhdr *); 3879 ch->chunk_type = SCTP_STREAM_RESET; 3880 ch->chunk_flags = 0; 3881 ch->chunk_length = htons(chk->send_size); 3882 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3883 offset += sizeof(struct sctp_chunkhdr); 3884 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3885 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3886 if (ph == NULL) 3887 break; 3888 param_len = ntohs(ph->param_length); 3889 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3890 /* bad param */ 3891 break; 3892 } 3893 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3894 (uint8_t *) & cstore); 3895 ptype = ntohs(ph->param_type); 3896 num_param++; 3897 if (param_len > (int)sizeof(cstore)) { 3898 trunc = 1; 3899 } else { 3900 trunc = 0; 3901 } 3902 3903 if (num_param > SCTP_MAX_RESET_PARAMS) { 3904 /* hit the max of parameters already sorry.. */ 3905 break; 3906 } 3907 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3908 struct sctp_stream_reset_out_request *req_out; 3909 3910 req_out = (struct sctp_stream_reset_out_request *)ph; 3911 num_req++; 3912 if (stcb->asoc.stream_reset_outstanding) { 3913 seq = ntohl(req_out->response_seq); 3914 if (seq == stcb->asoc.str_reset_seq_out) { 3915 /* implicit ack */ 3916 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3917 } 3918 } 3919 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3920 } else if (ptype == SCTP_STR_RESET_ADD_STREAMS) { 3921 struct sctp_stream_reset_add_strm *str_add; 3922 3923 str_add = (struct sctp_stream_reset_add_strm *)ph; 3924 num_req++; 3925 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 3926 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3927 struct sctp_stream_reset_in_request *req_in; 3928 3929 num_req++; 3930 3931 req_in = (struct sctp_stream_reset_in_request *)ph; 3932 3933 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3934 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3935 struct sctp_stream_reset_tsn_request *req_tsn; 3936 3937 num_req++; 3938 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3939 3940 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3941 ret_code = 1; 3942 goto strres_nochunk; 3943 } 3944 /* no more */ 3945 break; 3946 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3947 struct sctp_stream_reset_response *resp; 3948 uint32_t result; 3949 3950 resp = (struct sctp_stream_reset_response *)ph; 3951 seq = ntohl(resp->response_seq); 3952 result = ntohl(resp->result); 3953 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3954 ret_code = 1; 3955 goto strres_nochunk; 3956 } 3957 } else { 3958 break; 3959 } 3960 offset += SCTP_SIZE32(param_len); 3961 chk_length -= SCTP_SIZE32(param_len); 3962 } 3963 if (num_req == 0) { 3964 /* we have no response free the stuff */ 3965 goto strres_nochunk; 3966 } 3967 /* ok we have a chunk to link in */ 3968 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3969 chk, 3970 sctp_next); 3971 stcb->asoc.ctrl_queue_cnt++; 3972 return (ret_code); 3973} 3974 3975/* 3976 * Handle a router or endpoints report of a packet loss, there are two ways 3977 * to handle this, either we get the whole packet and must disect it 3978 * ourselves (possibly with truncation and or corruption) or it is a summary 3979 * from a middle box that did the disectting for us. 3980 */ 3981static void 3982sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3983 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3984{ 3985 uint32_t bottle_bw, on_queue; 3986 uint16_t trunc_len; 3987 unsigned int chlen; 3988 unsigned int at; 3989 struct sctp_chunk_desc desc; 3990 struct sctp_chunkhdr *ch; 3991 3992 chlen = ntohs(cp->ch.chunk_length); 3993 chlen -= sizeof(struct sctp_pktdrop_chunk); 3994 /* XXX possible chlen underflow */ 3995 if (chlen == 0) { 3996 ch = NULL; 3997 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3998 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3999 } else { 4000 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4001 chlen -= sizeof(struct sctphdr); 4002 /* XXX possible chlen underflow */ 4003 memset(&desc, 0, sizeof(desc)); 4004 } 4005 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4006 if (trunc_len > limit) { 4007 trunc_len = limit; 4008 } 4009 /* now the chunks themselves */ 4010 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4011 desc.chunk_type = ch->chunk_type; 4012 /* get amount we need to move */ 4013 at = ntohs(ch->chunk_length); 4014 if (at < sizeof(struct sctp_chunkhdr)) { 4015 /* corrupt chunk, maybe at the end? */ 4016 SCTP_STAT_INCR(sctps_pdrpcrupt); 4017 break; 4018 } 4019 if (trunc_len == 0) { 4020 /* we are supposed to have all of it */ 4021 if (at > chlen) { 4022 /* corrupt skip it */ 4023 SCTP_STAT_INCR(sctps_pdrpcrupt); 4024 break; 4025 } 4026 } else { 4027 /* is there enough of it left ? */ 4028 if (desc.chunk_type == SCTP_DATA) { 4029 if (chlen < (sizeof(struct sctp_data_chunk) + 4030 sizeof(desc.data_bytes))) { 4031 break; 4032 } 4033 } else { 4034 if (chlen < sizeof(struct sctp_chunkhdr)) { 4035 break; 4036 } 4037 } 4038 } 4039 if (desc.chunk_type == SCTP_DATA) { 4040 /* can we get out the tsn? */ 4041 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4042 SCTP_STAT_INCR(sctps_pdrpmbda); 4043 4044 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4045 /* yep */ 4046 struct sctp_data_chunk *dcp; 4047 uint8_t *ddp; 4048 unsigned int iii; 4049 4050 dcp = (struct sctp_data_chunk *)ch; 4051 ddp = (uint8_t *) (dcp + 1); 4052 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4053 desc.data_bytes[iii] = ddp[iii]; 4054 } 4055 desc.tsn_ifany = dcp->dp.tsn; 4056 } else { 4057 /* nope we are done. */ 4058 SCTP_STAT_INCR(sctps_pdrpnedat); 4059 break; 4060 } 4061 } else { 4062 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4063 SCTP_STAT_INCR(sctps_pdrpmbct); 4064 } 4065 4066 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4067 SCTP_STAT_INCR(sctps_pdrppdbrk); 4068 break; 4069 } 4070 if (SCTP_SIZE32(at) > chlen) { 4071 break; 4072 } 4073 chlen -= SCTP_SIZE32(at); 4074 if (chlen < sizeof(struct sctp_chunkhdr)) { 4075 /* done, none left */ 4076 break; 4077 } 4078 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4079 } 4080 /* Now update any rwnd --- possibly */ 4081 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4082 /* From a peer, we get a rwnd report */ 4083 uint32_t a_rwnd; 4084 4085 SCTP_STAT_INCR(sctps_pdrpfehos); 4086 4087 bottle_bw = ntohl(cp->bottle_bw); 4088 on_queue = ntohl(cp->current_onq); 4089 if (bottle_bw && on_queue) { 4090 /* a rwnd report is in here */ 4091 if (bottle_bw > on_queue) 4092 a_rwnd = bottle_bw - on_queue; 4093 else 4094 a_rwnd = 0; 4095 4096 if (a_rwnd == 0) 4097 stcb->asoc.peers_rwnd = 0; 4098 else { 4099 if (a_rwnd > stcb->asoc.total_flight) { 4100 stcb->asoc.peers_rwnd = 4101 a_rwnd - stcb->asoc.total_flight; 4102 } else { 4103 stcb->asoc.peers_rwnd = 0; 4104 } 4105 if (stcb->asoc.peers_rwnd < 4106 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4107 /* SWS sender side engages */ 4108 stcb->asoc.peers_rwnd = 0; 4109 } 4110 } 4111 } 4112 } else { 4113 SCTP_STAT_INCR(sctps_pdrpfmbox); 4114 } 4115 4116 /* now middle boxes in sat networks get a cwnd bump */ 4117 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4118 (stcb->asoc.sat_t3_loss_recovery == 0) && 4119 (stcb->asoc.sat_network)) { 4120 /* 4121 * This is debateable but for sat networks it makes sense 4122 * Note if a T3 timer has went off, we will prohibit any 4123 * changes to cwnd until we exit the t3 loss recovery. 4124 */ 4125 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4126 net, cp, &bottle_bw, &on_queue); 4127 } 4128} 4129 4130/* 4131 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4132 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4133 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4134 * length of the complete packet outputs: - length: modified to remaining 4135 * length after control processing - netp: modified to new sctp_nets after 4136 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4137 * bad packet,...) otherwise return the tcb for this packet 4138 */ 4139#ifdef __GNUC__ 4140__attribute__((noinline)) 4141#endif 4142 static struct sctp_tcb * 4143 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4144 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4145 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4146 uint32_t vrf_id, uint16_t port) 4147{ 4148 struct sctp_association *asoc; 4149 uint32_t vtag_in; 4150 int num_chunks = 0; /* number of control chunks processed */ 4151 uint32_t chk_length; 4152 int ret; 4153 int abort_no_unlock = 0; 4154 4155 /* 4156 * How big should this be, and should it be alloc'd? Lets try the 4157 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4158 * until we get into jumbo grams and such.. 4159 */ 4160 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4161 struct sctp_tcb *locked_tcb = stcb; 4162 int got_auth = 0; 4163 uint32_t auth_offset = 0, auth_len = 0; 4164 int auth_skipped = 0; 4165 int asconf_cnt = 0; 4166 4167#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4168 struct socket *so; 4169 4170#endif 4171 4172 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4173 iphlen, *offset, length, stcb); 4174 4175 /* validate chunk header length... */ 4176 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4177 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4178 ntohs(ch->chunk_length)); 4179 if (locked_tcb) { 4180 SCTP_TCB_UNLOCK(locked_tcb); 4181 } 4182 return (NULL); 4183 } 4184 /* 4185 * validate the verification tag 4186 */ 4187 vtag_in = ntohl(sh->v_tag); 4188 4189 if (locked_tcb) { 4190 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4191 } 4192 if (ch->chunk_type == SCTP_INITIATION) { 4193 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4194 ntohs(ch->chunk_length), vtag_in); 4195 if (vtag_in != 0) { 4196 /* protocol error- silently discard... */ 4197 SCTP_STAT_INCR(sctps_badvtag); 4198 if (locked_tcb) { 4199 SCTP_TCB_UNLOCK(locked_tcb); 4200 } 4201 return (NULL); 4202 } 4203 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4204 /* 4205 * If there is no stcb, skip the AUTH chunk and process 4206 * later after a stcb is found (to validate the lookup was 4207 * valid. 4208 */ 4209 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4210 (stcb == NULL) && 4211 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4212 /* save this chunk for later processing */ 4213 auth_skipped = 1; 4214 auth_offset = *offset; 4215 auth_len = ntohs(ch->chunk_length); 4216 4217 /* (temporarily) move past this chunk */ 4218 *offset += SCTP_SIZE32(auth_len); 4219 if (*offset >= length) { 4220 /* no more data left in the mbuf chain */ 4221 *offset = length; 4222 if (locked_tcb) { 4223 SCTP_TCB_UNLOCK(locked_tcb); 4224 } 4225 return (NULL); 4226 } 4227 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4228 sizeof(struct sctp_chunkhdr), chunk_buf); 4229 } 4230 if (ch == NULL) { 4231 /* Help */ 4232 *offset = length; 4233 if (locked_tcb) { 4234 SCTP_TCB_UNLOCK(locked_tcb); 4235 } 4236 return (NULL); 4237 } 4238 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4239 goto process_control_chunks; 4240 } 4241 /* 4242 * first check if it's an ASCONF with an unknown src addr we 4243 * need to look inside to find the association 4244 */ 4245 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4246 struct sctp_chunkhdr *asconf_ch = ch; 4247 uint32_t asconf_offset = 0, asconf_len = 0; 4248 4249 /* inp's refcount may be reduced */ 4250 SCTP_INP_INCR_REF(inp); 4251 4252 asconf_offset = *offset; 4253 do { 4254 asconf_len = ntohs(asconf_ch->chunk_length); 4255 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4256 break; 4257 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4258 *offset, sh, &inp, netp, vrf_id); 4259 if (stcb != NULL) 4260 break; 4261 asconf_offset += SCTP_SIZE32(asconf_len); 4262 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4263 sizeof(struct sctp_chunkhdr), chunk_buf); 4264 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4265 if (stcb == NULL) { 4266 /* 4267 * reduce inp's refcount if not reduced in 4268 * sctp_findassociation_ep_asconf(). 4269 */ 4270 SCTP_INP_DECR_REF(inp); 4271 } else { 4272 locked_tcb = stcb; 4273 } 4274 4275 /* now go back and verify any auth chunk to be sure */ 4276 if (auth_skipped && (stcb != NULL)) { 4277 struct sctp_auth_chunk *auth; 4278 4279 auth = (struct sctp_auth_chunk *) 4280 sctp_m_getptr(m, auth_offset, 4281 auth_len, chunk_buf); 4282 got_auth = 1; 4283 auth_skipped = 0; 4284 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4285 auth_offset)) { 4286 /* auth HMAC failed so dump it */ 4287 *offset = length; 4288 if (locked_tcb) { 4289 SCTP_TCB_UNLOCK(locked_tcb); 4290 } 4291 return (NULL); 4292 } else { 4293 /* remaining chunks are HMAC checked */ 4294 stcb->asoc.authenticated = 1; 4295 } 4296 } 4297 } 4298 if (stcb == NULL) { 4299 /* no association, so it's out of the blue... */ 4300 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4301 vrf_id, port); 4302 *offset = length; 4303 if (locked_tcb) { 4304 SCTP_TCB_UNLOCK(locked_tcb); 4305 } 4306 return (NULL); 4307 } 4308 asoc = &stcb->asoc; 4309 /* ABORT and SHUTDOWN can use either v_tag... */ 4310 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4311 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4312 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4313 if ((vtag_in == asoc->my_vtag) || 4314 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4315 (vtag_in == asoc->peer_vtag))) { 4316 /* this is valid */ 4317 } else { 4318 /* drop this packet... */ 4319 SCTP_STAT_INCR(sctps_badvtag); 4320 if (locked_tcb) { 4321 SCTP_TCB_UNLOCK(locked_tcb); 4322 } 4323 return (NULL); 4324 } 4325 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4326 if (vtag_in != asoc->my_vtag) { 4327 /* 4328 * this could be a stale SHUTDOWN-ACK or the 4329 * peer never got the SHUTDOWN-COMPLETE and 4330 * is still hung; we have started a new asoc 4331 * but it won't complete until the shutdown 4332 * is completed 4333 */ 4334 if (locked_tcb) { 4335 SCTP_TCB_UNLOCK(locked_tcb); 4336 } 4337 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4338 NULL, vrf_id, port); 4339 return (NULL); 4340 } 4341 } else { 4342 /* for all other chunks, vtag must match */ 4343 if (vtag_in != asoc->my_vtag) { 4344 /* invalid vtag... */ 4345 SCTPDBG(SCTP_DEBUG_INPUT3, 4346 "invalid vtag: %xh, expect %xh\n", 4347 vtag_in, asoc->my_vtag); 4348 SCTP_STAT_INCR(sctps_badvtag); 4349 if (locked_tcb) { 4350 SCTP_TCB_UNLOCK(locked_tcb); 4351 } 4352 *offset = length; 4353 return (NULL); 4354 } 4355 } 4356 } /* end if !SCTP_COOKIE_ECHO */ 4357 /* 4358 * process all control chunks... 4359 */ 4360 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4361 /* EY */ 4362 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4363 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4364 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4365 /* implied cookie-ack.. we must have lost the ack */ 4366 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4367 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4368 stcb->asoc.overall_error_count, 4369 0, 4370 SCTP_FROM_SCTP_INPUT, 4371 __LINE__); 4372 } 4373 stcb->asoc.overall_error_count = 0; 4374 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4375 *netp); 4376 } 4377process_control_chunks: 4378 while (IS_SCTP_CONTROL(ch)) { 4379 /* validate chunk length */ 4380 chk_length = ntohs(ch->chunk_length); 4381 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4382 ch->chunk_type, chk_length); 4383 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4384 if (chk_length < sizeof(*ch) || 4385 (*offset + (int)chk_length) > length) { 4386 *offset = length; 4387 if (locked_tcb) { 4388 SCTP_TCB_UNLOCK(locked_tcb); 4389 } 4390 return (NULL); 4391 } 4392 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4393 /* 4394 * INIT-ACK only gets the init ack "header" portion only 4395 * because we don't have to process the peer's COOKIE. All 4396 * others get a complete chunk. 4397 */ 4398 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4399 (ch->chunk_type == SCTP_INITIATION)) { 4400 /* get an init-ack chunk */ 4401 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4402 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4403 if (ch == NULL) { 4404 *offset = length; 4405 if (locked_tcb) { 4406 SCTP_TCB_UNLOCK(locked_tcb); 4407 } 4408 return (NULL); 4409 } 4410 } else { 4411 /* For cookies and all other chunks. */ 4412 if (chk_length > sizeof(chunk_buf)) { 4413 /* 4414 * use just the size of the chunk buffer so 4415 * the front part of our chunks fit in 4416 * contiguous space up to the chunk buffer 4417 * size (508 bytes). For chunks that need to 4418 * get more than that they must use the 4419 * sctp_m_getptr() function or other means 4420 * (e.g. know how to parse mbuf chains). 4421 * Cookies do this already. 4422 */ 4423 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4424 (sizeof(chunk_buf) - 4), 4425 chunk_buf); 4426 if (ch == NULL) { 4427 *offset = length; 4428 if (locked_tcb) { 4429 SCTP_TCB_UNLOCK(locked_tcb); 4430 } 4431 return (NULL); 4432 } 4433 } else { 4434 /* We can fit it all */ 4435 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4436 chk_length, chunk_buf); 4437 if (ch == NULL) { 4438 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4439 *offset = length; 4440 if (locked_tcb) { 4441 SCTP_TCB_UNLOCK(locked_tcb); 4442 } 4443 return (NULL); 4444 } 4445 } 4446 } 4447 num_chunks++; 4448 /* Save off the last place we got a control from */ 4449 if (stcb != NULL) { 4450 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4451 /* 4452 * allow last_control to be NULL if 4453 * ASCONF... ASCONF processing will find the 4454 * right net later 4455 */ 4456 if ((netp != NULL) && (*netp != NULL)) 4457 stcb->asoc.last_control_chunk_from = *netp; 4458 } 4459 } 4460#ifdef SCTP_AUDITING_ENABLED 4461 sctp_audit_log(0xB0, ch->chunk_type); 4462#endif 4463 4464 /* check to see if this chunk required auth, but isn't */ 4465 if ((stcb != NULL) && 4466 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4467 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4468 !stcb->asoc.authenticated) { 4469 /* "silently" ignore */ 4470 SCTP_STAT_INCR(sctps_recvauthmissing); 4471 goto next_chunk; 4472 } 4473 switch (ch->chunk_type) { 4474 case SCTP_INITIATION: 4475 /* must be first and only chunk */ 4476 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4477 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4478 /* We are not interested anymore? */ 4479 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4480 /* 4481 * collision case where we are 4482 * sending to them too 4483 */ 4484 ; 4485 } else { 4486 if (locked_tcb) { 4487 SCTP_TCB_UNLOCK(locked_tcb); 4488 } 4489 *offset = length; 4490 return (NULL); 4491 } 4492 } 4493 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4494 (num_chunks > 1) || 4495 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4496 *offset = length; 4497 if (locked_tcb) { 4498 SCTP_TCB_UNLOCK(locked_tcb); 4499 } 4500 return (NULL); 4501 } 4502 if ((stcb != NULL) && 4503 (SCTP_GET_STATE(&stcb->asoc) == 4504 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4505 sctp_send_shutdown_ack(stcb, 4506 stcb->asoc.primary_destination); 4507 *offset = length; 4508 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4509 if (locked_tcb) { 4510 SCTP_TCB_UNLOCK(locked_tcb); 4511 } 4512 return (NULL); 4513 } 4514 if (netp) { 4515 sctp_handle_init(m, iphlen, *offset, sh, 4516 (struct sctp_init_chunk *)ch, inp, 4517 stcb, *netp, &abort_no_unlock, vrf_id, port); 4518 } 4519 if (abort_no_unlock) 4520 return (NULL); 4521 4522 *offset = length; 4523 if (locked_tcb) { 4524 SCTP_TCB_UNLOCK(locked_tcb); 4525 } 4526 return (NULL); 4527 break; 4528 case SCTP_PAD_CHUNK: 4529 break; 4530 case SCTP_INITIATION_ACK: 4531 /* must be first and only chunk */ 4532 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4533 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4534 /* We are not interested anymore */ 4535 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4536 ; 4537 } else { 4538 if (locked_tcb != stcb) { 4539 /* Very unlikely */ 4540 SCTP_TCB_UNLOCK(locked_tcb); 4541 } 4542 *offset = length; 4543 if (stcb) { 4544#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4545 so = SCTP_INP_SO(inp); 4546 atomic_add_int(&stcb->asoc.refcnt, 1); 4547 SCTP_TCB_UNLOCK(stcb); 4548 SCTP_SOCKET_LOCK(so, 1); 4549 SCTP_TCB_LOCK(stcb); 4550 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4551#endif 4552 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4553#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4554 SCTP_SOCKET_UNLOCK(so, 1); 4555#endif 4556 } 4557 return (NULL); 4558 } 4559 } 4560 if ((num_chunks > 1) || 4561 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4562 *offset = length; 4563 if (locked_tcb) { 4564 SCTP_TCB_UNLOCK(locked_tcb); 4565 } 4566 return (NULL); 4567 } 4568 if ((netp) && (*netp)) { 4569 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4570 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4571 } else { 4572 ret = -1; 4573 } 4574 /* 4575 * Special case, I must call the output routine to 4576 * get the cookie echoed 4577 */ 4578 if (abort_no_unlock) 4579 return (NULL); 4580 4581 if ((stcb) && ret == 0) 4582 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4583 *offset = length; 4584 if (locked_tcb) { 4585 SCTP_TCB_UNLOCK(locked_tcb); 4586 } 4587 return (NULL); 4588 break; 4589 case SCTP_SELECTIVE_ACK: 4590 { 4591 struct sctp_sack_chunk *sack; 4592 int abort_now = 0; 4593 uint32_t a_rwnd, cum_ack; 4594 uint16_t num_seg, num_dup; 4595 uint8_t flags; 4596 int offset_seg, offset_dup; 4597 int nonce_sum_flag; 4598 4599 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4600 SCTP_STAT_INCR(sctps_recvsacks); 4601 if (stcb == NULL) { 4602 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4603 break; 4604 } 4605 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4606 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4607 break; 4608 } 4609 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4610 /*- 4611 * If we have sent a shutdown-ack, we will pay no 4612 * attention to a sack sent in to us since 4613 * we don't care anymore. 4614 */ 4615 break; 4616 } 4617 sack = (struct sctp_sack_chunk *)ch; 4618 flags = ch->chunk_flags; 4619 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4620 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4621 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4622 num_dup = ntohs(sack->sack.num_dup_tsns); 4623 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4624 if (sizeof(struct sctp_sack_chunk) + 4625 num_seg * sizeof(struct sctp_gap_ack_block) + 4626 num_dup * sizeof(uint32_t) != chk_length) { 4627 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4628 break; 4629 } 4630 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4631 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4632 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4633 cum_ack, num_seg, a_rwnd); 4634 stcb->asoc.seen_a_sack_this_pkt = 1; 4635 if ((stcb->asoc.pr_sctp_cnt == 0) && 4636 (num_seg == 0) && 4637 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4638 (cum_ack == stcb->asoc.last_acked_seq)) && 4639 (stcb->asoc.saw_sack_with_frags == 0) && 4640 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4641 ) { 4642 /* 4643 * We have a SIMPLE sack having no 4644 * prior segments and data on sent 4645 * queue to be acked.. Use the 4646 * faster path sack processing. We 4647 * also allow window update sacks 4648 * with no missing segments to go 4649 * this way too. 4650 */ 4651 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4652 &abort_now); 4653 } else { 4654 if (netp && *netp) 4655 sctp_handle_sack(m, offset_seg, offset_dup, 4656 stcb, *netp, 4657 num_seg, 0, num_dup, &abort_now, flags, 4658 cum_ack, a_rwnd); 4659 } 4660 if (abort_now) { 4661 /* ABORT signal from sack processing */ 4662 *offset = length; 4663 return (NULL); 4664 } 4665 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4666 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4667 (stcb->asoc.stream_queue_cnt == 0)) { 4668 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4669 } 4670 } 4671 break; 4672 /* 4673 * EY - nr_sack: If the received chunk is an 4674 * nr_sack chunk 4675 */ 4676 case SCTP_NR_SELECTIVE_ACK: 4677 { 4678 struct sctp_nr_sack_chunk *nr_sack; 4679 int abort_now = 0; 4680 uint32_t a_rwnd, cum_ack; 4681 uint16_t num_seg, num_nr_seg, num_dup; 4682 uint8_t flags; 4683 int offset_seg, offset_dup; 4684 int nonce_sum_flag; 4685 4686 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4687 SCTP_STAT_INCR(sctps_recvsacks); 4688 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4689 (stcb->asoc.peer_supports_nr_sack == 0)) { 4690 goto unknown_chunk; 4691 } 4692 if (stcb == NULL) { 4693 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4694 break; 4695 } 4696 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4697 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4698 break; 4699 } 4700 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4701 /*- 4702 * If we have sent a shutdown-ack, we will pay no 4703 * attention to a sack sent in to us since 4704 * we don't care anymore. 4705 */ 4706 break; 4707 } 4708 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4709 flags = ch->chunk_flags; 4710 nonce_sum_flag = flags & SCTP_SACK_NONCE_SUM; 4711 4712 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4713 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4714 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4715 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4716 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4717 if (sizeof(struct sctp_nr_sack_chunk) + 4718 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4719 num_dup * sizeof(uint32_t) != chk_length) { 4720 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4721 break; 4722 } 4723 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4724 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4725 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4726 cum_ack, num_seg, a_rwnd); 4727 stcb->asoc.seen_a_sack_this_pkt = 1; 4728 if ((stcb->asoc.pr_sctp_cnt == 0) && 4729 (num_seg == 0) && (num_nr_seg == 0) && 4730 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4731 (cum_ack == stcb->asoc.last_acked_seq)) && 4732 (stcb->asoc.saw_sack_with_frags == 0) && 4733 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4734 /* 4735 * We have a SIMPLE sack having no 4736 * prior segments and data on sent 4737 * queue to be acked. Use the faster 4738 * path sack processing. We also 4739 * allow window update sacks with no 4740 * missing segments to go this way 4741 * too. 4742 */ 4743 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4744 &abort_now); 4745 } else { 4746 if (netp && *netp) 4747 sctp_handle_sack(m, offset_seg, offset_dup, 4748 stcb, *netp, 4749 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4750 cum_ack, a_rwnd); 4751 } 4752 if (abort_now) { 4753 /* ABORT signal from sack processing */ 4754 *offset = length; 4755 return (NULL); 4756 } 4757 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4758 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4759 (stcb->asoc.stream_queue_cnt == 0)) { 4760 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4761 } 4762 } 4763 break; 4764 4765 case SCTP_HEARTBEAT_REQUEST: 4766 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4767 if ((stcb) && netp && *netp) { 4768 SCTP_STAT_INCR(sctps_recvheartbeat); 4769 sctp_send_heartbeat_ack(stcb, m, *offset, 4770 chk_length, *netp); 4771 4772 /* He's alive so give him credit */ 4773 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4774 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4775 stcb->asoc.overall_error_count, 4776 0, 4777 SCTP_FROM_SCTP_INPUT, 4778 __LINE__); 4779 } 4780 stcb->asoc.overall_error_count = 0; 4781 } 4782 break; 4783 case SCTP_HEARTBEAT_ACK: 4784 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4785 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4786 /* Its not ours */ 4787 *offset = length; 4788 if (locked_tcb) { 4789 SCTP_TCB_UNLOCK(locked_tcb); 4790 } 4791 return (NULL); 4792 } 4793 /* He's alive so give him credit */ 4794 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4795 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4796 stcb->asoc.overall_error_count, 4797 0, 4798 SCTP_FROM_SCTP_INPUT, 4799 __LINE__); 4800 } 4801 stcb->asoc.overall_error_count = 0; 4802 SCTP_STAT_INCR(sctps_recvheartbeatack); 4803 if (netp && *netp) 4804 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4805 stcb, *netp); 4806 break; 4807 case SCTP_ABORT_ASSOCIATION: 4808 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4809 stcb); 4810 if ((stcb) && netp && *netp) 4811 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4812 stcb, *netp); 4813 *offset = length; 4814 return (NULL); 4815 break; 4816 case SCTP_SHUTDOWN: 4817 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4818 stcb); 4819 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4820 *offset = length; 4821 if (locked_tcb) { 4822 SCTP_TCB_UNLOCK(locked_tcb); 4823 } 4824 return (NULL); 4825 } 4826 if (netp && *netp) { 4827 int abort_flag = 0; 4828 4829 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4830 stcb, *netp, &abort_flag); 4831 if (abort_flag) { 4832 *offset = length; 4833 return (NULL); 4834 } 4835 } 4836 break; 4837 case SCTP_SHUTDOWN_ACK: 4838 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4839 if ((stcb) && (netp) && (*netp)) 4840 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4841 *offset = length; 4842 return (NULL); 4843 break; 4844 4845 case SCTP_OPERATION_ERROR: 4846 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4847 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4848 4849 *offset = length; 4850 return (NULL); 4851 } 4852 break; 4853 case SCTP_COOKIE_ECHO: 4854 SCTPDBG(SCTP_DEBUG_INPUT3, 4855 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4856 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4857 ; 4858 } else { 4859 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4860 /* We are not interested anymore */ 4861 abend: 4862 if (stcb) { 4863 SCTP_TCB_UNLOCK(stcb); 4864 } 4865 *offset = length; 4866 return (NULL); 4867 } 4868 } 4869 /* 4870 * First are we accepting? We do this again here 4871 * since it is possible that a previous endpoint WAS 4872 * listening responded to a INIT-ACK and then 4873 * closed. We opened and bound.. and are now no 4874 * longer listening. 4875 */ 4876 4877 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4878 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4879 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4880 struct mbuf *oper; 4881 struct sctp_paramhdr *phdr; 4882 4883 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4884 0, M_DONTWAIT, 1, MT_DATA); 4885 if (oper) { 4886 SCTP_BUF_LEN(oper) = 4887 sizeof(struct sctp_paramhdr); 4888 phdr = mtod(oper, 4889 struct sctp_paramhdr *); 4890 phdr->param_type = 4891 htons(SCTP_CAUSE_OUT_OF_RESC); 4892 phdr->param_length = 4893 htons(sizeof(struct sctp_paramhdr)); 4894 } 4895 sctp_abort_association(inp, stcb, m, 4896 iphlen, sh, oper, vrf_id, port); 4897 } 4898 *offset = length; 4899 return (NULL); 4900 } else { 4901 struct mbuf *ret_buf; 4902 struct sctp_inpcb *linp; 4903 4904 if (stcb) { 4905 linp = NULL; 4906 } else { 4907 linp = inp; 4908 } 4909 4910 if (linp) { 4911 SCTP_ASOC_CREATE_LOCK(linp); 4912 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4913 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4914 SCTP_ASOC_CREATE_UNLOCK(linp); 4915 goto abend; 4916 } 4917 } 4918 if (netp) { 4919 ret_buf = 4920 sctp_handle_cookie_echo(m, iphlen, 4921 *offset, sh, 4922 (struct sctp_cookie_echo_chunk *)ch, 4923 &inp, &stcb, netp, 4924 auth_skipped, 4925 auth_offset, 4926 auth_len, 4927 &locked_tcb, 4928 vrf_id, 4929 port); 4930 } else { 4931 ret_buf = NULL; 4932 } 4933 if (linp) { 4934 SCTP_ASOC_CREATE_UNLOCK(linp); 4935 } 4936 if (ret_buf == NULL) { 4937 if (locked_tcb) { 4938 SCTP_TCB_UNLOCK(locked_tcb); 4939 } 4940 SCTPDBG(SCTP_DEBUG_INPUT3, 4941 "GAK, null buffer\n"); 4942 auth_skipped = 0; 4943 *offset = length; 4944 return (NULL); 4945 } 4946 /* if AUTH skipped, see if it verified... */ 4947 if (auth_skipped) { 4948 got_auth = 1; 4949 auth_skipped = 0; 4950 } 4951 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4952 /* 4953 * Restart the timer if we have 4954 * pending data 4955 */ 4956 struct sctp_tmit_chunk *chk; 4957 4958 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4959 if (chk) { 4960 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4961 stcb->sctp_ep, stcb, 4962 chk->whoTo); 4963 } 4964 } 4965 } 4966 break; 4967 case SCTP_COOKIE_ACK: 4968 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4969 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4970 if (locked_tcb) { 4971 SCTP_TCB_UNLOCK(locked_tcb); 4972 } 4973 return (NULL); 4974 } 4975 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4976 /* We are not interested anymore */ 4977 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4978 ; 4979 } else if (stcb) { 4980#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4981 so = SCTP_INP_SO(inp); 4982 atomic_add_int(&stcb->asoc.refcnt, 1); 4983 SCTP_TCB_UNLOCK(stcb); 4984 SCTP_SOCKET_LOCK(so, 1); 4985 SCTP_TCB_LOCK(stcb); 4986 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4987#endif 4988 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4989#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4990 SCTP_SOCKET_UNLOCK(so, 1); 4991#endif 4992 *offset = length; 4993 return (NULL); 4994 } 4995 } 4996 /* He's alive so give him credit */ 4997 if ((stcb) && netp && *netp) { 4998 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4999 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5000 stcb->asoc.overall_error_count, 5001 0, 5002 SCTP_FROM_SCTP_INPUT, 5003 __LINE__); 5004 } 5005 stcb->asoc.overall_error_count = 0; 5006 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5007 } 5008 break; 5009 case SCTP_ECN_ECHO: 5010 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5011 /* He's alive so give him credit */ 5012 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5013 /* Its not ours */ 5014 if (locked_tcb) { 5015 SCTP_TCB_UNLOCK(locked_tcb); 5016 } 5017 *offset = length; 5018 return (NULL); 5019 } 5020 if (stcb) { 5021 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5022 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5023 stcb->asoc.overall_error_count, 5024 0, 5025 SCTP_FROM_SCTP_INPUT, 5026 __LINE__); 5027 } 5028 stcb->asoc.overall_error_count = 0; 5029 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5030 stcb); 5031 } 5032 break; 5033 case SCTP_ECN_CWR: 5034 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5035 /* He's alive so give him credit */ 5036 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5037 /* Its not ours */ 5038 if (locked_tcb) { 5039 SCTP_TCB_UNLOCK(locked_tcb); 5040 } 5041 *offset = length; 5042 return (NULL); 5043 } 5044 if (stcb) { 5045 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5046 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5047 stcb->asoc.overall_error_count, 5048 0, 5049 SCTP_FROM_SCTP_INPUT, 5050 __LINE__); 5051 } 5052 stcb->asoc.overall_error_count = 0; 5053 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 5054 } 5055 break; 5056 case SCTP_SHUTDOWN_COMPLETE: 5057 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5058 /* must be first and only chunk */ 5059 if ((num_chunks > 1) || 5060 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5061 *offset = length; 5062 if (locked_tcb) { 5063 SCTP_TCB_UNLOCK(locked_tcb); 5064 } 5065 return (NULL); 5066 } 5067 if ((stcb) && netp && *netp) { 5068 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5069 stcb, *netp); 5070 } 5071 *offset = length; 5072 return (NULL); 5073 break; 5074 case SCTP_ASCONF: 5075 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5076 /* He's alive so give him credit */ 5077 if (stcb) { 5078 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5079 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5080 stcb->asoc.overall_error_count, 5081 0, 5082 SCTP_FROM_SCTP_INPUT, 5083 __LINE__); 5084 } 5085 stcb->asoc.overall_error_count = 0; 5086 sctp_handle_asconf(m, *offset, 5087 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5088 asconf_cnt++; 5089 } 5090 break; 5091 case SCTP_ASCONF_ACK: 5092 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5093 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5094 /* Its not ours */ 5095 if (locked_tcb) { 5096 SCTP_TCB_UNLOCK(locked_tcb); 5097 } 5098 *offset = length; 5099 return (NULL); 5100 } 5101 if ((stcb) && netp && *netp) { 5102 /* He's alive so give him credit */ 5103 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5104 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5105 stcb->asoc.overall_error_count, 5106 0, 5107 SCTP_FROM_SCTP_INPUT, 5108 __LINE__); 5109 } 5110 stcb->asoc.overall_error_count = 0; 5111 sctp_handle_asconf_ack(m, *offset, 5112 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5113 if (abort_no_unlock) 5114 return (NULL); 5115 } 5116 break; 5117 case SCTP_FORWARD_CUM_TSN: 5118 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5119 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5120 /* Its not ours */ 5121 if (locked_tcb) { 5122 SCTP_TCB_UNLOCK(locked_tcb); 5123 } 5124 *offset = length; 5125 return (NULL); 5126 } 5127 /* He's alive so give him credit */ 5128 if (stcb) { 5129 int abort_flag = 0; 5130 5131 stcb->asoc.overall_error_count = 0; 5132 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5133 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5134 stcb->asoc.overall_error_count, 5135 0, 5136 SCTP_FROM_SCTP_INPUT, 5137 __LINE__); 5138 } 5139 *fwd_tsn_seen = 1; 5140 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5141 /* We are not interested anymore */ 5142#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5143 so = SCTP_INP_SO(inp); 5144 atomic_add_int(&stcb->asoc.refcnt, 1); 5145 SCTP_TCB_UNLOCK(stcb); 5146 SCTP_SOCKET_LOCK(so, 1); 5147 SCTP_TCB_LOCK(stcb); 5148 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5149#endif 5150 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5151#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5152 SCTP_SOCKET_UNLOCK(so, 1); 5153#endif 5154 *offset = length; 5155 return (NULL); 5156 } 5157 sctp_handle_forward_tsn(stcb, 5158 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5159 if (abort_flag) { 5160 *offset = length; 5161 return (NULL); 5162 } else { 5163 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5164 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5165 stcb->asoc.overall_error_count, 5166 0, 5167 SCTP_FROM_SCTP_INPUT, 5168 __LINE__); 5169 } 5170 stcb->asoc.overall_error_count = 0; 5171 } 5172 5173 } 5174 break; 5175 case SCTP_STREAM_RESET: 5176 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5177 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5178 /* Its not ours */ 5179 if (locked_tcb) { 5180 SCTP_TCB_UNLOCK(locked_tcb); 5181 } 5182 *offset = length; 5183 return (NULL); 5184 } 5185 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5186 /* We are not interested anymore */ 5187#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5188 so = SCTP_INP_SO(inp); 5189 atomic_add_int(&stcb->asoc.refcnt, 1); 5190 SCTP_TCB_UNLOCK(stcb); 5191 SCTP_SOCKET_LOCK(so, 1); 5192 SCTP_TCB_LOCK(stcb); 5193 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5194#endif 5195 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5196#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5197 SCTP_SOCKET_UNLOCK(so, 1); 5198#endif 5199 *offset = length; 5200 return (NULL); 5201 } 5202 if (stcb->asoc.peer_supports_strreset == 0) { 5203 /* 5204 * hmm, peer should have announced this, but 5205 * we will turn it on since he is sending us 5206 * a stream reset. 5207 */ 5208 stcb->asoc.peer_supports_strreset = 1; 5209 } 5210 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5211 /* stop processing */ 5212 *offset = length; 5213 return (NULL); 5214 } 5215 break; 5216 case SCTP_PACKET_DROPPED: 5217 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5218 /* re-get it all please */ 5219 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5220 /* Its not ours */ 5221 if (locked_tcb) { 5222 SCTP_TCB_UNLOCK(locked_tcb); 5223 } 5224 *offset = length; 5225 return (NULL); 5226 } 5227 if (ch && (stcb) && netp && (*netp)) { 5228 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5229 stcb, *netp, 5230 min(chk_length, (sizeof(chunk_buf) - 4))); 5231 5232 } 5233 break; 5234 5235 case SCTP_AUTHENTICATION: 5236 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5237 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5238 goto unknown_chunk; 5239 5240 if (stcb == NULL) { 5241 /* save the first AUTH for later processing */ 5242 if (auth_skipped == 0) { 5243 auth_offset = *offset; 5244 auth_len = chk_length; 5245 auth_skipped = 1; 5246 } 5247 /* skip this chunk (temporarily) */ 5248 goto next_chunk; 5249 } 5250 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5251 (chk_length > (sizeof(struct sctp_auth_chunk) + 5252 SCTP_AUTH_DIGEST_LEN_MAX))) { 5253 /* Its not ours */ 5254 if (locked_tcb) { 5255 SCTP_TCB_UNLOCK(locked_tcb); 5256 } 5257 *offset = length; 5258 return (NULL); 5259 } 5260 if (got_auth == 1) { 5261 /* skip this chunk... it's already auth'd */ 5262 goto next_chunk; 5263 } 5264 got_auth = 1; 5265 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5266 m, *offset)) { 5267 /* auth HMAC failed so dump the packet */ 5268 *offset = length; 5269 return (stcb); 5270 } else { 5271 /* remaining chunks are HMAC checked */ 5272 stcb->asoc.authenticated = 1; 5273 } 5274 break; 5275 5276 default: 5277 unknown_chunk: 5278 /* it's an unknown chunk! */ 5279 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5280 struct mbuf *mm; 5281 struct sctp_paramhdr *phd; 5282 5283 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5284 0, M_DONTWAIT, 1, MT_DATA); 5285 if (mm) { 5286 phd = mtod(mm, struct sctp_paramhdr *); 5287 /* 5288 * We cheat and use param type since 5289 * we did not bother to define a 5290 * error cause struct. They are the 5291 * same basic format with different 5292 * names. 5293 */ 5294 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5295 phd->param_length = htons(chk_length + sizeof(*phd)); 5296 SCTP_BUF_LEN(mm) = sizeof(*phd); 5297 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5298 M_DONTWAIT); 5299 if (SCTP_BUF_NEXT(mm)) { 5300#ifdef SCTP_MBUF_LOGGING 5301 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5302 struct mbuf *mat; 5303 5304 mat = SCTP_BUF_NEXT(mm); 5305 while (mat) { 5306 if (SCTP_BUF_IS_EXTENDED(mat)) { 5307 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5308 } 5309 mat = SCTP_BUF_NEXT(mat); 5310 } 5311 } 5312#endif 5313 sctp_queue_op_err(stcb, mm); 5314 } else { 5315 sctp_m_freem(mm); 5316 } 5317 } 5318 } 5319 if ((ch->chunk_type & 0x80) == 0) { 5320 /* discard this packet */ 5321 *offset = length; 5322 return (stcb); 5323 } /* else skip this bad chunk and continue... */ 5324 break; 5325 } /* switch (ch->chunk_type) */ 5326 5327 5328next_chunk: 5329 /* get the next chunk */ 5330 *offset += SCTP_SIZE32(chk_length); 5331 if (*offset >= length) { 5332 /* no more data left in the mbuf chain */ 5333 break; 5334 } 5335 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5336 sizeof(struct sctp_chunkhdr), chunk_buf); 5337 if (ch == NULL) { 5338 if (locked_tcb) { 5339 SCTP_TCB_UNLOCK(locked_tcb); 5340 } 5341 *offset = length; 5342 return (NULL); 5343 } 5344 } /* while */ 5345 5346 if (asconf_cnt > 0 && stcb != NULL) { 5347 sctp_send_asconf_ack(stcb); 5348 } 5349 return (stcb); 5350} 5351 5352 5353/* 5354 * Process the ECN bits we have something set so we must look to see if it is 5355 * ECN(0) or ECN(1) or CE 5356 */ 5357static void 5358sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5359 uint8_t ecn_bits) 5360{ 5361 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5362 ; 5363 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5364 /* 5365 * we only add to the nonce sum for ECT1, ECT0 does not 5366 * change the NS bit (that we have yet to find a way to send 5367 * it yet). 5368 */ 5369 5370 /* ECN Nonce stuff */ 5371 stcb->asoc.receiver_nonce_sum++; 5372 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5373 5374 /* 5375 * Drag up the last_echo point if cumack is larger since we 5376 * don't want the point falling way behind by more than 5377 * 2^^31 and then having it be incorrect. 5378 */ 5379 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5380 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5381 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5382 } 5383 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5384 /* 5385 * Drag up the last_echo point if cumack is larger since we 5386 * don't want the point falling way behind by more than 5387 * 2^^31 and then having it be incorrect. 5388 */ 5389 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5390 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5391 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5392 } 5393 } 5394} 5395 5396static void 5397sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5398 uint32_t high_tsn, uint8_t ecn_bits) 5399{ 5400 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5401 /* 5402 * we possibly must notify the sender that a congestion 5403 * window reduction is in order. We do this by adding a ECNE 5404 * chunk to the output chunk queue. The incoming CWR will 5405 * remove this chunk. 5406 */ 5407 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5408 MAX_TSN)) { 5409 /* Yep, we need to add a ECNE */ 5410 sctp_send_ecn_echo(stcb, net, high_tsn); 5411 stcb->asoc.last_echo_tsn = high_tsn; 5412 } 5413 } 5414} 5415 5416#ifdef INVARIANTS 5417#ifdef __GNUC__ 5418__attribute__((noinline)) 5419#endif 5420 void 5421 sctp_validate_no_locks(struct sctp_inpcb *inp) 5422{ 5423 struct sctp_tcb *lstcb; 5424 5425 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5426 if (mtx_owned(&lstcb->tcb_mtx)) { 5427 panic("Own lock on stcb at return from input"); 5428 } 5429 } 5430 if (mtx_owned(&inp->inp_create_mtx)) { 5431 panic("Own create lock on inp"); 5432 } 5433 if (mtx_owned(&inp->inp_mtx)) { 5434 panic("Own inp lock on inp"); 5435 } 5436} 5437 5438#endif 5439 5440/* 5441 * common input chunk processing (v4 and v6) 5442 */ 5443void 5444sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5445 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5446 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5447 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5448{ 5449 /* 5450 * Control chunk processing 5451 */ 5452 uint32_t high_tsn; 5453 int fwd_tsn_seen = 0, data_processed = 0; 5454 struct mbuf *m = *mm; 5455 int abort_flag = 0; 5456 int un_sent; 5457 5458 SCTP_STAT_INCR(sctps_recvdatagrams); 5459#ifdef SCTP_AUDITING_ENABLED 5460 sctp_audit_log(0xE0, 1); 5461 sctp_auditing(0, inp, stcb, net); 5462#endif 5463 5464 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5465 m, iphlen, offset, length, stcb); 5466 if (stcb) { 5467 /* always clear this before beginning a packet */ 5468 stcb->asoc.authenticated = 0; 5469 stcb->asoc.seen_a_sack_this_pkt = 0; 5470 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5471 stcb, stcb->asoc.state); 5472 5473 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5474 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5475 /*- 5476 * If we hit here, we had a ref count 5477 * up when the assoc was aborted and the 5478 * timer is clearing out the assoc, we should 5479 * NOT respond to any packet.. its OOTB. 5480 */ 5481 SCTP_TCB_UNLOCK(stcb); 5482 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5483 vrf_id, port); 5484 goto out_now; 5485 } 5486 } 5487 if (IS_SCTP_CONTROL(ch)) { 5488 /* process the control portion of the SCTP packet */ 5489 /* sa_ignore NO_NULL_CHK */ 5490 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5491 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5492 if (stcb) { 5493 /* 5494 * This covers us if the cookie-echo was there and 5495 * it changes our INP. 5496 */ 5497 inp = stcb->sctp_ep; 5498 if ((net) && (port)) { 5499 if (net->port == 0) { 5500 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5501 } 5502 net->port = port; 5503 } 5504 } 5505 } else { 5506 /* 5507 * no control chunks, so pre-process DATA chunks (these 5508 * checks are taken care of by control processing) 5509 */ 5510 5511 /* 5512 * if DATA only packet, and auth is required, then punt... 5513 * can't have authenticated without any AUTH (control) 5514 * chunks 5515 */ 5516 if ((stcb != NULL) && 5517 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5518 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5519 /* "silently" ignore */ 5520 SCTP_STAT_INCR(sctps_recvauthmissing); 5521 SCTP_TCB_UNLOCK(stcb); 5522 goto out_now; 5523 } 5524 if (stcb == NULL) { 5525 /* out of the blue DATA chunk */ 5526 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5527 vrf_id, port); 5528 goto out_now; 5529 } 5530 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5531 /* v_tag mismatch! */ 5532 SCTP_STAT_INCR(sctps_badvtag); 5533 SCTP_TCB_UNLOCK(stcb); 5534 goto out_now; 5535 } 5536 } 5537 5538 if (stcb == NULL) { 5539 /* 5540 * no valid TCB for this packet, or we found it's a bad 5541 * packet while processing control, or we're done with this 5542 * packet (done or skip rest of data), so we drop it... 5543 */ 5544 goto out_now; 5545 } 5546 /* 5547 * DATA chunk processing 5548 */ 5549 /* plow through the data chunks while length > offset */ 5550 5551 /* 5552 * Rest should be DATA only. Check authentication state if AUTH for 5553 * DATA is required. 5554 */ 5555 if ((length > offset) && 5556 (stcb != NULL) && 5557 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5558 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5559 !stcb->asoc.authenticated) { 5560 /* "silently" ignore */ 5561 SCTP_STAT_INCR(sctps_recvauthmissing); 5562 SCTPDBG(SCTP_DEBUG_AUTH1, 5563 "Data chunk requires AUTH, skipped\n"); 5564 goto trigger_send; 5565 } 5566 if (length > offset) { 5567 int retval; 5568 5569 /* 5570 * First check to make sure our state is correct. We would 5571 * not get here unless we really did have a tag, so we don't 5572 * abort if this happens, just dump the chunk silently. 5573 */ 5574 switch (SCTP_GET_STATE(&stcb->asoc)) { 5575 case SCTP_STATE_COOKIE_ECHOED: 5576 /* 5577 * we consider data with valid tags in this state 5578 * shows us the cookie-ack was lost. Imply it was 5579 * there. 5580 */ 5581 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5582 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5583 stcb->asoc.overall_error_count, 5584 0, 5585 SCTP_FROM_SCTP_INPUT, 5586 __LINE__); 5587 } 5588 stcb->asoc.overall_error_count = 0; 5589 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5590 break; 5591 case SCTP_STATE_COOKIE_WAIT: 5592 /* 5593 * We consider OOTB any data sent during asoc setup. 5594 */ 5595 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5596 vrf_id, port); 5597 SCTP_TCB_UNLOCK(stcb); 5598 goto out_now; 5599 /* sa_ignore NOTREACHED */ 5600 break; 5601 case SCTP_STATE_EMPTY: /* should not happen */ 5602 case SCTP_STATE_INUSE: /* should not happen */ 5603 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5604 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5605 default: 5606 SCTP_TCB_UNLOCK(stcb); 5607 goto out_now; 5608 /* sa_ignore NOTREACHED */ 5609 break; 5610 case SCTP_STATE_OPEN: 5611 case SCTP_STATE_SHUTDOWN_SENT: 5612 break; 5613 } 5614 /* take care of ECN, part 1. */ 5615 if (stcb->asoc.ecn_allowed && 5616 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5617 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5618 } 5619 /* plow through the data chunks while length > offset */ 5620 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5621 inp, stcb, net, &high_tsn); 5622 if (retval == 2) { 5623 /* 5624 * The association aborted, NO UNLOCK needed since 5625 * the association is destroyed. 5626 */ 5627 goto out_now; 5628 } 5629 data_processed = 1; 5630 if (retval == 0) { 5631 /* take care of ecn part 2. */ 5632 if (stcb->asoc.ecn_allowed && 5633 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5634 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5635 ecn_bits); 5636 } 5637 } 5638 /* 5639 * Anything important needs to have been m_copy'ed in 5640 * process_data 5641 */ 5642 } 5643 if ((data_processed == 0) && (fwd_tsn_seen)) { 5644 int was_a_gap = 0; 5645 5646 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5647 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5648 /* there was a gap before this data was processed */ 5649 was_a_gap = 1; 5650 } 5651 stcb->asoc.send_sack = 1; 5652 sctp_sack_check(stcb, was_a_gap, &abort_flag); 5653 if (abort_flag) { 5654 /* Again, we aborted so NO UNLOCK needed */ 5655 goto out_now; 5656 } 5657 } else if (fwd_tsn_seen) { 5658 stcb->asoc.send_sack = 1; 5659 } 5660 /* trigger send of any chunks in queue... */ 5661trigger_send: 5662#ifdef SCTP_AUDITING_ENABLED 5663 sctp_audit_log(0xE0, 2); 5664 sctp_auditing(1, inp, stcb, net); 5665#endif 5666 SCTPDBG(SCTP_DEBUG_INPUT1, 5667 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5668 stcb->asoc.peers_rwnd, 5669 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5670 stcb->asoc.total_flight); 5671 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5672 5673 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5674 ((un_sent) && 5675 (stcb->asoc.peers_rwnd > 0 || 5676 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5677 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5678 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5679 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5680 } 5681#ifdef SCTP_AUDITING_ENABLED 5682 sctp_audit_log(0xE0, 3); 5683 sctp_auditing(2, inp, stcb, net); 5684#endif 5685 SCTP_TCB_UNLOCK(stcb); 5686out_now: 5687#ifdef INVARIANTS 5688 sctp_validate_no_locks(inp); 5689#endif 5690 return; 5691} 5692 5693#if 0 5694static void 5695sctp_print_mbuf_chain(struct mbuf *m) 5696{ 5697 for (; m; m = SCTP_BUF_NEXT(m)) { 5698 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5699 if (SCTP_BUF_IS_EXTENDED(m)) 5700 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5701 } 5702} 5703 5704#endif 5705 5706void 5707sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5708{ 5709#ifdef SCTP_MBUF_LOGGING 5710 struct mbuf *mat; 5711 5712#endif 5713 struct mbuf *m; 5714 int iphlen; 5715 uint32_t vrf_id = 0; 5716 uint8_t ecn_bits; 5717 struct ip *ip; 5718 struct sctphdr *sh; 5719 struct sctp_inpcb *inp = NULL; 5720 struct sctp_nets *net; 5721 struct sctp_tcb *stcb = NULL; 5722 struct sctp_chunkhdr *ch; 5723 int refcount_up = 0; 5724 int length, mlen, offset; 5725 5726#if !defined(SCTP_WITH_NO_CSUM) 5727 uint32_t check, calc_check; 5728 5729#endif 5730 5731 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5732 SCTP_RELEASE_PKT(i_pak); 5733 return; 5734 } 5735 mlen = SCTP_HEADER_LEN(i_pak); 5736 iphlen = off; 5737 m = SCTP_HEADER_TO_CHAIN(i_pak); 5738 5739 net = NULL; 5740 SCTP_STAT_INCR(sctps_recvpackets); 5741 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5742 5743 5744#ifdef SCTP_MBUF_LOGGING 5745 /* Log in any input mbufs */ 5746 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5747 mat = m; 5748 while (mat) { 5749 if (SCTP_BUF_IS_EXTENDED(mat)) { 5750 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5751 } 5752 mat = SCTP_BUF_NEXT(mat); 5753 } 5754 } 5755#endif 5756#ifdef SCTP_PACKET_LOGGING 5757 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5758 sctp_packet_log(m, mlen); 5759#endif 5760 /* 5761 * Must take out the iphlen, since mlen expects this (only effect lb 5762 * case) 5763 */ 5764 mlen -= iphlen; 5765 5766 /* 5767 * Get IP, SCTP, and first chunk header together in first mbuf. 5768 */ 5769 ip = mtod(m, struct ip *); 5770 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5771 if (SCTP_BUF_LEN(m) < offset) { 5772 if ((m = m_pullup(m, offset)) == 0) { 5773 SCTP_STAT_INCR(sctps_hdrops); 5774 return; 5775 } 5776 ip = mtod(m, struct ip *); 5777 } 5778 /* validate mbuf chain length with IP payload length */ 5779 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5780 SCTP_STAT_INCR(sctps_hdrops); 5781 goto bad; 5782 } 5783 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5784 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5785 SCTPDBG(SCTP_DEBUG_INPUT1, 5786 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5787 5788 /* SCTP does not allow broadcasts or multicasts */ 5789 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5790 goto bad; 5791 } 5792 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5793 /* 5794 * We only look at broadcast if its a front state, All 5795 * others we will not have a tcb for anyway. 5796 */ 5797 goto bad; 5798 } 5799 /* validate SCTP checksum */ 5800 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5801 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5802 m->m_pkthdr.len, 5803 if_name(m->m_pkthdr.rcvif), 5804 m->m_pkthdr.csum_flags); 5805#if defined(SCTP_WITH_NO_CSUM) 5806 SCTP_STAT_INCR(sctps_recvnocrc); 5807#else 5808 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5809 SCTP_STAT_INCR(sctps_recvhwcrc); 5810 goto sctp_skip_csum_4; 5811 } 5812 check = sh->checksum; /* save incoming checksum */ 5813 sh->checksum = 0; /* prepare for calc */ 5814 calc_check = sctp_calculate_cksum(m, iphlen); 5815 sh->checksum = check; 5816 SCTP_STAT_INCR(sctps_recvswcrc); 5817 if (calc_check != check) { 5818 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5819 calc_check, check, m, mlen, iphlen); 5820 5821 stcb = sctp_findassociation_addr(m, iphlen, 5822 offset - sizeof(*ch), 5823 sh, ch, &inp, &net, 5824 vrf_id); 5825 if ((net) && (port)) { 5826 if (net->port == 0) { 5827 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5828 } 5829 net->port = port; 5830 } 5831 if ((inp) && (stcb)) { 5832 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5833 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5834 } else if ((inp != NULL) && (stcb == NULL)) { 5835 refcount_up = 1; 5836 } 5837 SCTP_STAT_INCR(sctps_badsum); 5838 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5839 goto bad; 5840 } 5841sctp_skip_csum_4: 5842#endif 5843 /* destination port of 0 is illegal, based on RFC2960. */ 5844 if (sh->dest_port == 0) { 5845 SCTP_STAT_INCR(sctps_hdrops); 5846 goto bad; 5847 } 5848 /* 5849 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5850 * IP/SCTP/first chunk header... 5851 */ 5852 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5853 sh, ch, &inp, &net, vrf_id); 5854 if ((net) && (port)) { 5855 if (net->port == 0) { 5856 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5857 } 5858 net->port = port; 5859 } 5860 /* inp's ref-count increased && stcb locked */ 5861 if (inp == NULL) { 5862 struct sctp_init_chunk *init_chk, chunk_buf; 5863 5864 SCTP_STAT_INCR(sctps_noport); 5865#ifdef ICMP_BANDLIM 5866 /* 5867 * we use the bandwidth limiting to protect against sending 5868 * too many ABORTS all at once. In this case these count the 5869 * same as an ICMP message. 5870 */ 5871 if (badport_bandlim(0) < 0) 5872 goto bad; 5873#endif /* ICMP_BANDLIM */ 5874 SCTPDBG(SCTP_DEBUG_INPUT1, 5875 "Sending a ABORT from packet entry!\n"); 5876 if (ch->chunk_type == SCTP_INITIATION) { 5877 /* 5878 * we do a trick here to get the INIT tag, dig in 5879 * and get the tag from the INIT and put it in the 5880 * common header. 5881 */ 5882 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5883 iphlen + sizeof(*sh), sizeof(*init_chk), 5884 (uint8_t *) & chunk_buf); 5885 if (init_chk != NULL) 5886 sh->v_tag = init_chk->init.initiate_tag; 5887 } 5888 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5889 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5890 goto bad; 5891 } 5892 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5893 goto bad; 5894 } 5895 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5896 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5897 goto bad; 5898 } else if (stcb == NULL) { 5899 refcount_up = 1; 5900 } 5901#ifdef IPSEC 5902 /* 5903 * I very much doubt any of the IPSEC stuff will work but I have no 5904 * idea, so I will leave it in place. 5905 */ 5906 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5907 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5908 SCTP_STAT_INCR(sctps_hdrops); 5909 goto bad; 5910 } 5911#endif /* IPSEC */ 5912 5913 /* 5914 * common chunk processing 5915 */ 5916 length = ip->ip_len + iphlen; 5917 offset -= sizeof(struct sctp_chunkhdr); 5918 5919 ecn_bits = ip->ip_tos; 5920 5921 /* sa_ignore NO_NULL_CHK */ 5922 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5923 inp, stcb, net, ecn_bits, vrf_id, port); 5924 /* inp's ref-count reduced && stcb unlocked */ 5925 if (m) { 5926 sctp_m_freem(m); 5927 } 5928 if ((inp) && (refcount_up)) { 5929 /* reduce ref-count */ 5930 SCTP_INP_DECR_REF(inp); 5931 } 5932 return; 5933bad: 5934 if (stcb) { 5935 SCTP_TCB_UNLOCK(stcb); 5936 } 5937 if ((inp) && (refcount_up)) { 5938 /* reduce ref-count */ 5939 SCTP_INP_DECR_REF(inp); 5940 } 5941 if (m) { 5942 sctp_m_freem(m); 5943 } 5944 return; 5945} 5946void 5947sctp_input(i_pak, off) 5948 struct mbuf *i_pak; 5949 int off; 5950{ 5951 sctp_input_with_port(i_pak, off, 0); 5952} 5953