sctp_input.c revision 233660
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2011, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2011, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 34 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 233660 2012-03-29 13:36:53Z rrs $"); 37 38#include <netinet/sctp_os.h> 39#include <netinet/sctp_var.h> 40#include <netinet/sctp_sysctl.h> 41#include <netinet/sctp_pcb.h> 42#include <netinet/sctp_header.h> 43#include <netinet/sctputil.h> 44#include <netinet/sctp_output.h> 45#include <netinet/sctp_input.h> 46#include <netinet/sctp_auth.h> 47#include <netinet/sctp_indata.h> 48#include <netinet/sctp_asconf.h> 49#include <netinet/sctp_bsd_addr.h> 50#include <netinet/sctp_timer.h> 51#include <netinet/sctp_crc32.h> 52#include <netinet/udp.h> 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 86 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 87 int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 88{ 89 struct sctp_init *init; 90 struct mbuf *op_err; 91 92 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 93 stcb); 94 if (stcb == NULL) { 95 SCTP_INP_RLOCK(inp); 96 } 97 /* validate length */ 98 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 99 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 100 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 101 vrf_id, port); 102 if (stcb) 103 *abort_no_unlock = 1; 104 goto outnow; 105 } 106 /* validate parameters */ 107 init = &cp->init; 108 if (init->initiate_tag == 0) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 111 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 112 vrf_id, port); 113 if (stcb) 114 *abort_no_unlock = 1; 115 goto outnow; 116 } 117 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 118 /* invalid parameter... send abort */ 119 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 120 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 121 vrf_id, port); 122 if (stcb) 123 *abort_no_unlock = 1; 124 goto outnow; 125 } 126 if (init->num_inbound_streams == 0) { 127 /* protocol error... send abort */ 128 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 129 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_outbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 138 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 139 vrf_id, port); 140 if (stcb) 141 *abort_no_unlock = 1; 142 goto outnow; 143 } 144 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 145 offset + ntohs(cp->ch.chunk_length))) { 146 /* auth parameter(s) error... send abort */ 147 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 /* 153 * We are only accepting if we have a socket with positive 154 * so_qlimit. 155 */ 156 if ((stcb == NULL) && 157 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 158 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 159 (inp->sctp_socket == NULL) || 160 (inp->sctp_socket->so_qlimit == 0))) { 161 /* 162 * FIX ME ?? What about TCP model and we have a 163 * match/restart case? Actually no fix is needed. the lookup 164 * will always find the existing assoc so stcb would not be 165 * NULL. It may be questionable to do this since we COULD 166 * just send back the INIT-ACK and hope that the app did 167 * accept()'s by the time the COOKIE was sent. But there is 168 * a price to pay for COOKIE generation and I don't want to 169 * pay it on the chance that the app will actually do some 170 * accepts(). The App just looses and should NOT be in this 171 * state :-) 172 */ 173 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 174 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 175 } 176 goto outnow; 177 } 178 if ((stcb != NULL) && 179 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 180 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 181 sctp_send_shutdown_ack(stcb, NULL); 182 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 183 } else { 184 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 185 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 186 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 187 } 188outnow: 189 if (stcb == NULL) { 190 SCTP_INP_RUNLOCK(inp); 191 } 192} 193 194/* 195 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 196 */ 197 198int 199sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 200#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 201 SCTP_UNUSED 202#endif 203) 204{ 205 int unsent_data = 0; 206 unsigned int i; 207 struct sctp_stream_queue_pending *sp; 208 struct sctp_association *asoc; 209 210 /* 211 * This function returns the number of streams that have true unsent 212 * data on them. Note that as it looks through it will clean up any 213 * places that have old data that has been sent but left at top of 214 * stream queue. 215 */ 216 asoc = &stcb->asoc; 217 SCTP_TCB_SEND_LOCK(stcb); 218 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 219 /* Check to see if some data queued */ 220 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 221 /* sa_ignore FREED_MEMORY */ 222 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 223 if (sp == NULL) { 224 continue; 225 } 226 if ((sp->msg_is_complete) && 227 (sp->length == 0) && 228 (sp->sender_all_done)) { 229 /* 230 * We are doing differed cleanup. Last time 231 * through when we took all the data the 232 * sender_all_done was not set. 233 */ 234 if (sp->put_last_out == 0) { 235 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 236 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 237 sp->sender_all_done, 238 sp->length, 239 sp->msg_is_complete, 240 sp->put_last_out); 241 } 242 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 243 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 244 if (sp->net) { 245 sctp_free_remote_addr(sp->net); 246 sp->net = NULL; 247 } 248 if (sp->data) { 249 sctp_m_freem(sp->data); 250 sp->data = NULL; 251 } 252 sctp_free_a_strmoq(stcb, sp, so_locked); 253 } else { 254 unsent_data++; 255 break; 256 } 257 } 258 } 259 SCTP_TCB_SEND_UNLOCK(stcb); 260 return (unsent_data); 261} 262 263static int 264sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 265{ 266 struct sctp_init *init; 267 struct sctp_association *asoc; 268 struct sctp_nets *lnet; 269 unsigned int i; 270 271 init = &cp->init; 272 asoc = &stcb->asoc; 273 /* save off parameters */ 274 asoc->peer_vtag = ntohl(init->initiate_tag); 275 asoc->peers_rwnd = ntohl(init->a_rwnd); 276 /* init tsn's */ 277 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 278 279 if (!TAILQ_EMPTY(&asoc->nets)) { 280 /* update any ssthresh's that may have a default */ 281 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 282 lnet->ssthresh = asoc->peers_rwnd; 283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 284 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 285 } 286 } 287 } 288 SCTP_TCB_SEND_LOCK(stcb); 289 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 290 unsigned int newcnt; 291 struct sctp_stream_out *outs; 292 struct sctp_stream_queue_pending *sp, *nsp; 293 struct sctp_tmit_chunk *chk, *nchk; 294 295 /* abandon the upper streams */ 296 newcnt = ntohs(init->num_inbound_streams); 297 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 298 if (chk->rec.data.stream_number >= newcnt) { 299 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 300 asoc->send_queue_cnt--; 301 if (chk->data != NULL) { 302 sctp_free_bufspace(stcb, asoc, chk, 1); 303 sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, 304 SCTP_NOTIFY_DATAGRAM_UNSENT, chk, SCTP_SO_NOT_LOCKED); 305 if (chk->data) { 306 sctp_m_freem(chk->data); 307 chk->data = NULL; 308 } 309 } 310 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 311 /* sa_ignore FREED_MEMORY */ 312 } 313 } 314 if (asoc->strmout) { 315 for (i = newcnt; i < asoc->pre_open_streams; i++) { 316 outs = &asoc->strmout[i]; 317 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 318 TAILQ_REMOVE(&outs->outqueue, sp, next); 319 asoc->stream_queue_cnt--; 320 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 321 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 322 sp, SCTP_SO_NOT_LOCKED); 323 if (sp->data) { 324 sctp_m_freem(sp->data); 325 sp->data = NULL; 326 } 327 if (sp->net) { 328 sctp_free_remote_addr(sp->net); 329 sp->net = NULL; 330 } 331 /* Free the chunk */ 332 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 333 /* sa_ignore FREED_MEMORY */ 334 } 335 } 336 } 337 /* cut back the count */ 338 asoc->pre_open_streams = newcnt; 339 } 340 SCTP_TCB_SEND_UNLOCK(stcb); 341 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 342 343 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 344 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 345 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 346 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 347 } 348 /* This is the next one we expect */ 349 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 350 351 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 352 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 353 354 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 355 /* open the requested streams */ 356 357 if (asoc->strmin != NULL) { 358 /* Free the old ones */ 359 struct sctp_queued_to_read *ctl, *nctl; 360 361 for (i = 0; i < asoc->streamincnt; i++) { 362 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 363 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 364 sctp_free_remote_addr(ctl->whoFrom); 365 ctl->whoFrom = NULL; 366 sctp_m_freem(ctl->data); 367 ctl->data = NULL; 368 sctp_free_a_readq(stcb, ctl); 369 } 370 } 371 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 372 } 373 asoc->streamincnt = ntohs(init->num_outbound_streams); 374 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 375 asoc->streamincnt = MAX_SCTP_STREAMS; 376 } 377 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 378 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 379 if (asoc->strmin == NULL) { 380 /* we didn't get memory for the streams! */ 381 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 382 return (-1); 383 } 384 for (i = 0; i < asoc->streamincnt; i++) { 385 asoc->strmin[i].stream_no = i; 386 asoc->strmin[i].last_sequence_delivered = 0xffff; 387 /* 388 * U-stream ranges will be set when the cookie is unpacked. 389 * Or for the INIT sender they are un set (if pr-sctp not 390 * supported) when the INIT-ACK arrives. 391 */ 392 TAILQ_INIT(&asoc->strmin[i].inqueue); 393 asoc->strmin[i].delivery_started = 0; 394 } 395 /* 396 * load_address_from_init will put the addresses into the 397 * association when the COOKIE is processed or the INIT-ACK is 398 * processed. Both types of COOKIE's existing and new call this 399 * routine. It will remove addresses that are no longer in the 400 * association (for the restarting case where addresses are 401 * removed). Up front when the INIT arrives we will discard it if it 402 * is a restart and new addresses have been added. 403 */ 404 /* sa_ignore MEMLEAK */ 405 return (0); 406} 407 408/* 409 * INIT-ACK message processing/consumption returns value < 0 on error 410 */ 411static int 412sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 413 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 414 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 415{ 416 struct sctp_association *asoc; 417 struct mbuf *op_err; 418 int retval, abort_flag; 419 uint32_t initack_limit; 420 int nat_friendly = 0; 421 422 /* First verify that we have no illegal param's */ 423 abort_flag = 0; 424 op_err = NULL; 425 426 op_err = sctp_arethere_unrecognized_parameters(m, 427 (offset + sizeof(struct sctp_init_chunk)), 428 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 429 if (abort_flag) { 430 /* Send an abort and notify peer */ 431 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 432 *abort_no_unlock = 1; 433 return (-1); 434 } 435 asoc = &stcb->asoc; 436 asoc->peer_supports_nat = (uint8_t) nat_friendly; 437 /* process the peer's parameters in the INIT-ACK */ 438 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 439 if (retval < 0) { 440 return (retval); 441 } 442 initack_limit = offset + ntohs(cp->ch.chunk_length); 443 /* load all addresses */ 444 if ((retval = sctp_load_addresses_from_init(stcb, m, 445 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 446 NULL))) { 447 /* Huh, we should abort */ 448 SCTPDBG(SCTP_DEBUG_INPUT1, 449 "Load addresses from INIT causes an abort %d\n", 450 retval); 451 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 452 NULL, 0, net->port); 453 *abort_no_unlock = 1; 454 return (-1); 455 } 456 /* if the peer doesn't support asconf, flush the asconf queue */ 457 if (asoc->peer_supports_asconf == 0) { 458 struct sctp_asconf_addr *param, *nparam; 459 460 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 461 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 462 SCTP_FREE(param, SCTP_M_ASC_ADDR); 463 } 464 } 465 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 466 stcb->asoc.local_hmacs); 467 if (op_err) { 468 sctp_queue_op_err(stcb, op_err); 469 /* queuing will steal away the mbuf chain to the out queue */ 470 op_err = NULL; 471 } 472 /* extract the cookie and queue it to "echo" it back... */ 473 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 474 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 475 stcb->asoc.overall_error_count, 476 0, 477 SCTP_FROM_SCTP_INPUT, 478 __LINE__); 479 } 480 stcb->asoc.overall_error_count = 0; 481 net->error_count = 0; 482 483 /* 484 * Cancel the INIT timer, We do this first before queueing the 485 * cookie. We always cancel at the primary to assue that we are 486 * canceling the timer started by the INIT which always goes to the 487 * primary. 488 */ 489 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 490 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 491 492 /* calculate the RTO */ 493 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 494 SCTP_RTT_FROM_NON_DATA); 495 496 retval = sctp_send_cookie_echo(m, offset, stcb, net); 497 if (retval < 0) { 498 /* 499 * No cookie, we probably should send a op error. But in any 500 * case if there is no cookie in the INIT-ACK, we can 501 * abandon the peer, its broke. 502 */ 503 if (retval == -3) { 504 /* We abort with an error of missing mandatory param */ 505 op_err = 506 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 507 if (op_err) { 508 /* 509 * Expand beyond to include the mandatory 510 * param cookie 511 */ 512 struct sctp_inv_mandatory_param *mp; 513 514 SCTP_BUF_LEN(op_err) = 515 sizeof(struct sctp_inv_mandatory_param); 516 mp = mtod(op_err, 517 struct sctp_inv_mandatory_param *); 518 /* Subtract the reserved param */ 519 mp->length = 520 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 521 mp->num_param = htonl(1); 522 mp->param = htons(SCTP_STATE_COOKIE); 523 mp->resv = 0; 524 } 525 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 526 sh, op_err, vrf_id, net->port); 527 *abort_no_unlock = 1; 528 } 529 return (retval); 530 } 531 return (0); 532} 533 534static void 535sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 536 struct sctp_tcb *stcb, struct sctp_nets *net) 537{ 538 struct sockaddr_storage store; 539 struct sctp_nets *r_net, *f_net; 540 struct timeval tv; 541 int req_prim = 0; 542 uint16_t old_error_counter; 543 544#ifdef INET 545 struct sockaddr_in *sin; 546 547#endif 548#ifdef INET6 549 struct sockaddr_in6 *sin6; 550 551#endif 552 553 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 554 /* Invalid length */ 555 return; 556 } 557 memset(&store, 0, sizeof(store)); 558 switch (cp->heartbeat.hb_info.addr_family) { 559#ifdef INET 560 case AF_INET: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 562 sin = (struct sockaddr_in *)&store; 563 sin->sin_family = cp->heartbeat.hb_info.addr_family; 564 sin->sin_len = cp->heartbeat.hb_info.addr_len; 565 sin->sin_port = stcb->rport; 566 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 567 sizeof(sin->sin_addr)); 568 } else { 569 return; 570 } 571 break; 572#endif 573#ifdef INET6 574 case AF_INET6: 575 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 576 sin6 = (struct sockaddr_in6 *)&store; 577 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 578 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 579 sin6->sin6_port = stcb->rport; 580 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 581 sizeof(sin6->sin6_addr)); 582 } else { 583 return; 584 } 585 break; 586#endif 587 default: 588 return; 589 } 590 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 591 if (r_net == NULL) { 592 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 593 return; 594 } 595 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 596 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 597 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 598 /* 599 * If the its a HB and it's random value is correct when can 600 * confirm the destination. 601 */ 602 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 603 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 604 stcb->asoc.primary_destination = r_net; 605 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 606 f_net = TAILQ_FIRST(&stcb->asoc.nets); 607 if (f_net != r_net) { 608 /* 609 * first one on the list is NOT the primary 610 * sctp_cmpaddr() is much more efficent if 611 * the primary is the first on the list, 612 * make it so. 613 */ 614 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 615 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 616 } 617 req_prim = 1; 618 } 619 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 620 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 621 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 622 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 623 } 624 old_error_counter = r_net->error_count; 625 r_net->error_count = 0; 626 r_net->hb_responded = 1; 627 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 628 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 629 /* Now lets do a RTO with this */ 630 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 631 SCTP_RTT_FROM_NON_DATA); 632 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 633 r_net->dest_state |= SCTP_ADDR_REACHABLE; 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 635 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 } 637 if (r_net->dest_state & SCTP_ADDR_PF) { 638 r_net->dest_state &= ~SCTP_ADDR_PF; 639 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 640 } 641 if (old_error_counter > 0) { 642 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 643 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 644 } 645 if (r_net == stcb->asoc.primary_destination) { 646 if (stcb->asoc.alternate) { 647 /* release the alternate, primary is good */ 648 sctp_free_remote_addr(stcb->asoc.alternate); 649 stcb->asoc.alternate = NULL; 650 } 651 } 652 /* Mobility adaptation */ 653 if (req_prim) { 654 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 655 SCTP_MOBILITY_BASE) || 656 sctp_is_mobility_feature_on(stcb->sctp_ep, 657 SCTP_MOBILITY_FASTHANDOFF)) && 658 sctp_is_mobility_feature_on(stcb->sctp_ep, 659 SCTP_MOBILITY_PRIM_DELETED)) { 660 661 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_FASTHANDOFF)) { 664 sctp_assoc_immediate_retrans(stcb, 665 stcb->asoc.primary_destination); 666 } 667 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_BASE)) { 669 sctp_move_chunks_from_net(stcb, 670 stcb->asoc.deleted_primary); 671 } 672 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 673 stcb->asoc.deleted_primary); 674 } 675 } 676} 677 678static int 679sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 680{ 681 /* 682 * return 0 means we want you to proceed with the abort non-zero 683 * means no abort processing 684 */ 685 struct sctpasochead *head; 686 687 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 688 /* generate a new vtag and send init */ 689 LIST_REMOVE(stcb, sctp_asocs); 690 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 691 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 692 /* 693 * put it in the bucket in the vtag hash of assoc's for the 694 * system 695 */ 696 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 697 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 698 return (1); 699 } 700 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 701 /* 702 * treat like a case where the cookie expired i.e.: - dump 703 * current cookie. - generate a new vtag. - resend init. 704 */ 705 /* generate a new vtag and send init */ 706 LIST_REMOVE(stcb, sctp_asocs); 707 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 708 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 709 sctp_stop_all_cookie_timers(stcb); 710 sctp_toss_old_cookies(stcb, &stcb->asoc); 711 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 712 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 713 /* 714 * put it in the bucket in the vtag hash of assoc's for the 715 * system 716 */ 717 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 718 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 719 return (1); 720 } 721 return (0); 722} 723 724static int 725sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 726 struct sctp_nets *net) 727{ 728 /* 729 * return 0 means we want you to proceed with the abort non-zero 730 * means no abort processing 731 */ 732 if (stcb->asoc.peer_supports_auth == 0) { 733 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 734 return (0); 735 } 736 sctp_asconf_send_nat_state_update(stcb, net); 737 return (1); 738} 739 740 741static void 742sctp_handle_abort(struct sctp_abort_chunk *cp, 743 struct sctp_tcb *stcb, struct sctp_nets *net) 744{ 745#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 746 struct socket *so; 747 748#endif 749 uint16_t len; 750 751 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 752 if (stcb == NULL) 753 return; 754 755 len = ntohs(cp->ch.chunk_length); 756 if (len > sizeof(struct sctp_chunkhdr)) { 757 /* 758 * Need to check the cause codes for our two magic nat 759 * aborts which don't kill the assoc necessarily. 760 */ 761 struct sctp_abort_chunk *cpnext; 762 struct sctp_missing_nat_state *natc; 763 uint16_t cause; 764 765 cpnext = cp; 766 cpnext++; 767 natc = (struct sctp_missing_nat_state *)cpnext; 768 cause = ntohs(natc->cause); 769 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 771 cp->ch.chunk_flags); 772 if (sctp_handle_nat_colliding_state(stcb)) { 773 return; 774 } 775 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 776 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 777 cp->ch.chunk_flags); 778 if (sctp_handle_nat_missing_state(stcb, net)) { 779 return; 780 } 781 } 782 } 783 /* stop any receive timers */ 784 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 785 /* notify user of the abort and clean up... */ 786 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 787 /* free the tcb */ 788#if defined(SCTP_PANIC_ON_ABORT) 789 printf("stcb:%p state:%d rport:%d net:%p\n", 790 stcb, stcb->asoc.state, stcb->rport, net); 791 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 792 panic("Received an ABORT"); 793 } else { 794 printf("No panic its in state %x closed\n", stcb->asoc.state); 795 } 796#endif 797 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 798 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 799 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 800 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 801 } 802#ifdef SCTP_ASOCLOG_OF_TSNS 803 sctp_print_out_track_log(stcb); 804#endif 805#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 806 so = SCTP_INP_SO(stcb->sctp_ep); 807 atomic_add_int(&stcb->asoc.refcnt, 1); 808 SCTP_TCB_UNLOCK(stcb); 809 SCTP_SOCKET_LOCK(so, 1); 810 SCTP_TCB_LOCK(stcb); 811 atomic_subtract_int(&stcb->asoc.refcnt, 1); 812#endif 813 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 814 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 815 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 816#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 817 SCTP_SOCKET_UNLOCK(so, 1); 818#endif 819 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 820} 821 822static void 823sctp_start_net_timers(struct sctp_tcb *stcb) 824{ 825 uint32_t cnt_hb_sent; 826 struct sctp_nets *net; 827 828 cnt_hb_sent = 0; 829 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 830 /* 831 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 832 * If the dest in unconfirmed send a hb as well if under 833 * max_hb_burst have been sent. 834 */ 835 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 836 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 837 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 838 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 839 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 840 cnt_hb_sent++; 841 } 842 } 843 if (cnt_hb_sent) { 844 sctp_chunk_output(stcb->sctp_ep, stcb, 845 SCTP_OUTPUT_FROM_COOKIE_ACK, 846 SCTP_SO_NOT_LOCKED); 847 } 848} 849 850 851static void 852sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 853 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 854{ 855 struct sctp_association *asoc; 856 int some_on_streamwheel; 857 858#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 859 struct socket *so; 860 861#endif 862 863 SCTPDBG(SCTP_DEBUG_INPUT2, 864 "sctp_handle_shutdown: handling SHUTDOWN\n"); 865 if (stcb == NULL) 866 return; 867 asoc = &stcb->asoc; 868 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 869 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 870 return; 871 } 872 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 873 /* Shutdown NOT the expected size */ 874 return; 875 } else { 876 sctp_update_acked(stcb, cp, abort_flag); 877 if (*abort_flag) { 878 return; 879 } 880 } 881 if (asoc->control_pdapi) { 882 /* 883 * With a normal shutdown we assume the end of last record. 884 */ 885 SCTP_INP_READ_LOCK(stcb->sctp_ep); 886 asoc->control_pdapi->end_added = 1; 887 asoc->control_pdapi->pdapi_aborted = 1; 888 asoc->control_pdapi = NULL; 889 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 890#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 891 so = SCTP_INP_SO(stcb->sctp_ep); 892 atomic_add_int(&stcb->asoc.refcnt, 1); 893 SCTP_TCB_UNLOCK(stcb); 894 SCTP_SOCKET_LOCK(so, 1); 895 SCTP_TCB_LOCK(stcb); 896 atomic_subtract_int(&stcb->asoc.refcnt, 1); 897 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 898 /* assoc was freed while we were unlocked */ 899 SCTP_SOCKET_UNLOCK(so, 1); 900 return; 901 } 902#endif 903 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 904#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 905 SCTP_SOCKET_UNLOCK(so, 1); 906#endif 907 } 908 /* goto SHUTDOWN_RECEIVED state to block new requests */ 909 if (stcb->sctp_socket) { 910 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 911 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 912 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 913 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 914 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 915 /* 916 * notify upper layer that peer has initiated a 917 * shutdown 918 */ 919 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 920 921 /* reset time */ 922 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 923 } 924 } 925 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 926 /* 927 * stop the shutdown timer, since we WILL move to 928 * SHUTDOWN-ACK-SENT. 929 */ 930 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 931 } 932 /* Now is there unsent data on a stream somewhere? */ 933 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 934 935 if (!TAILQ_EMPTY(&asoc->send_queue) || 936 !TAILQ_EMPTY(&asoc->sent_queue) || 937 some_on_streamwheel) { 938 /* By returning we will push more data out */ 939 return; 940 } else { 941 /* no outstanding data to send, so move on... */ 942 /* send SHUTDOWN-ACK */ 943 sctp_send_shutdown_ack(stcb, net); 944 /* move to SHUTDOWN-ACK-SENT state */ 945 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 946 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 947 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 948 } 949 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 950 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 951 sctp_stop_timers_for_shutdown(stcb); 952 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 953 stcb, net); 954 } 955} 956 957static void 958sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 959 struct sctp_tcb *stcb, 960 struct sctp_nets *net) 961{ 962 struct sctp_association *asoc; 963 964#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 965 struct socket *so; 966 967 so = SCTP_INP_SO(stcb->sctp_ep); 968#endif 969 SCTPDBG(SCTP_DEBUG_INPUT2, 970 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 971 if (stcb == NULL) 972 return; 973 974 asoc = &stcb->asoc; 975 /* process according to association state */ 976 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 977 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 978 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 979 sctp_send_shutdown_complete(stcb, net, 1); 980 SCTP_TCB_UNLOCK(stcb); 981 return; 982 } 983 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 984 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 985 /* unexpected SHUTDOWN-ACK... so ignore... */ 986 SCTP_TCB_UNLOCK(stcb); 987 return; 988 } 989 if (asoc->control_pdapi) { 990 /* 991 * With a normal shutdown we assume the end of last record. 992 */ 993 SCTP_INP_READ_LOCK(stcb->sctp_ep); 994 asoc->control_pdapi->end_added = 1; 995 asoc->control_pdapi->pdapi_aborted = 1; 996 asoc->control_pdapi = NULL; 997 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 998#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 999 atomic_add_int(&stcb->asoc.refcnt, 1); 1000 SCTP_TCB_UNLOCK(stcb); 1001 SCTP_SOCKET_LOCK(so, 1); 1002 SCTP_TCB_LOCK(stcb); 1003 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1004 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1005 /* assoc was freed while we were unlocked */ 1006 SCTP_SOCKET_UNLOCK(so, 1); 1007 return; 1008 } 1009#endif 1010 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1011#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1012 SCTP_SOCKET_UNLOCK(so, 1); 1013#endif 1014 } 1015 /* are the queues empty? */ 1016 if (!TAILQ_EMPTY(&asoc->send_queue) || 1017 !TAILQ_EMPTY(&asoc->sent_queue) || 1018 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1019 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 1020 } 1021 /* stop the timer */ 1022 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1023 /* send SHUTDOWN-COMPLETE */ 1024 sctp_send_shutdown_complete(stcb, net, 0); 1025 /* notify upper layer protocol */ 1026 if (stcb->sctp_socket) { 1027 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1028 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1029 stcb->sctp_socket->so_snd.sb_cc = 0; 1030 } 1031 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1032 } 1033 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1034 /* free the TCB but first save off the ep */ 1035#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1036 atomic_add_int(&stcb->asoc.refcnt, 1); 1037 SCTP_TCB_UNLOCK(stcb); 1038 SCTP_SOCKET_LOCK(so, 1); 1039 SCTP_TCB_LOCK(stcb); 1040 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1041#endif 1042 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1043 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1044#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1045 SCTP_SOCKET_UNLOCK(so, 1); 1046#endif 1047} 1048 1049/* 1050 * Skip past the param header and then we will find the chunk that caused the 1051 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1052 * our peer must be broken. 1053 */ 1054static void 1055sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1056 struct sctp_nets *net) 1057{ 1058 struct sctp_chunkhdr *chk; 1059 1060 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1061 switch (chk->chunk_type) { 1062 case SCTP_ASCONF_ACK: 1063 case SCTP_ASCONF: 1064 sctp_asconf_cleanup(stcb, net); 1065 break; 1066 case SCTP_FORWARD_CUM_TSN: 1067 stcb->asoc.peer_supports_prsctp = 0; 1068 break; 1069 default: 1070 SCTPDBG(SCTP_DEBUG_INPUT2, 1071 "Peer does not support chunk type %d(%x)??\n", 1072 chk->chunk_type, (uint32_t) chk->chunk_type); 1073 break; 1074 } 1075} 1076 1077/* 1078 * Skip past the param header and then we will find the param that caused the 1079 * problem. There are a number of param's in a ASCONF OR the prsctp param 1080 * these will turn of specific features. 1081 */ 1082static void 1083sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1084{ 1085 struct sctp_paramhdr *pbad; 1086 1087 pbad = phdr + 1; 1088 switch (ntohs(pbad->param_type)) { 1089 /* pr-sctp draft */ 1090 case SCTP_PRSCTP_SUPPORTED: 1091 stcb->asoc.peer_supports_prsctp = 0; 1092 break; 1093 case SCTP_SUPPORTED_CHUNK_EXT: 1094 break; 1095 /* draft-ietf-tsvwg-addip-sctp */ 1096 case SCTP_HAS_NAT_SUPPORT: 1097 stcb->asoc.peer_supports_nat = 0; 1098 break; 1099 case SCTP_ADD_IP_ADDRESS: 1100 case SCTP_DEL_IP_ADDRESS: 1101 case SCTP_SET_PRIM_ADDR: 1102 stcb->asoc.peer_supports_asconf = 0; 1103 break; 1104 case SCTP_SUCCESS_REPORT: 1105 case SCTP_ERROR_CAUSE_IND: 1106 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1107 SCTPDBG(SCTP_DEBUG_INPUT2, 1108 "Turning off ASCONF to this strange peer\n"); 1109 stcb->asoc.peer_supports_asconf = 0; 1110 break; 1111 default: 1112 SCTPDBG(SCTP_DEBUG_INPUT2, 1113 "Peer does not support param type %d(%x)??\n", 1114 pbad->param_type, (uint32_t) pbad->param_type); 1115 break; 1116 } 1117} 1118 1119static int 1120sctp_handle_error(struct sctp_chunkhdr *ch, 1121 struct sctp_tcb *stcb, struct sctp_nets *net) 1122{ 1123 int chklen; 1124 struct sctp_paramhdr *phdr; 1125 uint16_t error_type; 1126 uint16_t error_len; 1127 struct sctp_association *asoc; 1128 int adjust; 1129 1130#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1131 struct socket *so; 1132 1133#endif 1134 1135 /* parse through all of the errors and process */ 1136 asoc = &stcb->asoc; 1137 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1138 sizeof(struct sctp_chunkhdr)); 1139 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1140 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1141 /* Process an Error Cause */ 1142 error_type = ntohs(phdr->param_type); 1143 error_len = ntohs(phdr->param_length); 1144 if ((error_len > chklen) || (error_len == 0)) { 1145 /* invalid param length for this param */ 1146 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1147 chklen, error_len); 1148 return (0); 1149 } 1150 switch (error_type) { 1151 case SCTP_CAUSE_INVALID_STREAM: 1152 case SCTP_CAUSE_MISSING_PARAM: 1153 case SCTP_CAUSE_INVALID_PARAM: 1154 case SCTP_CAUSE_NO_USER_DATA: 1155 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1156 error_type); 1157 break; 1158 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1159 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1160 ch->chunk_flags); 1161 if (sctp_handle_nat_colliding_state(stcb)) { 1162 return (0); 1163 } 1164 break; 1165 case SCTP_CAUSE_NAT_MISSING_STATE: 1166 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1167 ch->chunk_flags); 1168 if (sctp_handle_nat_missing_state(stcb, net)) { 1169 return (0); 1170 } 1171 break; 1172 case SCTP_CAUSE_STALE_COOKIE: 1173 /* 1174 * We only act if we have echoed a cookie and are 1175 * waiting. 1176 */ 1177 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1178 int *p; 1179 1180 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1181 /* Save the time doubled */ 1182 asoc->cookie_preserve_req = ntohl(*p) << 1; 1183 asoc->stale_cookie_count++; 1184 if (asoc->stale_cookie_count > 1185 asoc->max_init_times) { 1186 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1187 /* now free the asoc */ 1188#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1189 so = SCTP_INP_SO(stcb->sctp_ep); 1190 atomic_add_int(&stcb->asoc.refcnt, 1); 1191 SCTP_TCB_UNLOCK(stcb); 1192 SCTP_SOCKET_LOCK(so, 1); 1193 SCTP_TCB_LOCK(stcb); 1194 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1195#endif 1196 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1197 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1198#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1199 SCTP_SOCKET_UNLOCK(so, 1); 1200#endif 1201 return (-1); 1202 } 1203 /* blast back to INIT state */ 1204 sctp_toss_old_cookies(stcb, &stcb->asoc); 1205 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1206 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1207 sctp_stop_all_cookie_timers(stcb); 1208 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1209 } 1210 break; 1211 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1212 /* 1213 * Nothing we can do here, we don't do hostname 1214 * addresses so if the peer does not like my IPv6 1215 * (or IPv4 for that matter) it does not matter. If 1216 * they don't support that type of address, they can 1217 * NOT possibly get that packet type... i.e. with no 1218 * IPv6 you can't recieve a IPv6 packet. so we can 1219 * safely ignore this one. If we ever added support 1220 * for HOSTNAME Addresses, then we would need to do 1221 * something here. 1222 */ 1223 break; 1224 case SCTP_CAUSE_UNRECOG_CHUNK: 1225 sctp_process_unrecog_chunk(stcb, phdr, net); 1226 break; 1227 case SCTP_CAUSE_UNRECOG_PARAM: 1228 sctp_process_unrecog_param(stcb, phdr); 1229 break; 1230 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1231 /* 1232 * We ignore this since the timer will drive out a 1233 * new cookie anyway and there timer will drive us 1234 * to send a SHUTDOWN_COMPLETE. We can't send one 1235 * here since we don't have their tag. 1236 */ 1237 break; 1238 case SCTP_CAUSE_DELETING_LAST_ADDR: 1239 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1240 case SCTP_CAUSE_DELETING_SRC_ADDR: 1241 /* 1242 * We should NOT get these here, but in a 1243 * ASCONF-ACK. 1244 */ 1245 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1246 error_type); 1247 break; 1248 case SCTP_CAUSE_OUT_OF_RESC: 1249 /* 1250 * And what, pray tell do we do with the fact that 1251 * the peer is out of resources? Not really sure we 1252 * could do anything but abort. I suspect this 1253 * should have came WITH an abort instead of in a 1254 * OP-ERROR. 1255 */ 1256 break; 1257 default: 1258 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1259 error_type); 1260 break; 1261 } 1262 adjust = SCTP_SIZE32(error_len); 1263 chklen -= adjust; 1264 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1265 } 1266 return (0); 1267} 1268 1269static int 1270sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1271 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1272 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1273{ 1274 struct sctp_init_ack *init_ack; 1275 struct mbuf *op_err; 1276 1277 SCTPDBG(SCTP_DEBUG_INPUT2, 1278 "sctp_handle_init_ack: handling INIT-ACK\n"); 1279 1280 if (stcb == NULL) { 1281 SCTPDBG(SCTP_DEBUG_INPUT2, 1282 "sctp_handle_init_ack: TCB is null\n"); 1283 return (-1); 1284 } 1285 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1286 /* Invalid length */ 1287 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1288 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1289 op_err, 0, net->port); 1290 *abort_no_unlock = 1; 1291 return (-1); 1292 } 1293 init_ack = &cp->init; 1294 /* validate parameters */ 1295 if (init_ack->initiate_tag == 0) { 1296 /* protocol error... send an abort */ 1297 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1298 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1299 op_err, 0, net->port); 1300 *abort_no_unlock = 1; 1301 return (-1); 1302 } 1303 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1304 /* protocol error... send an abort */ 1305 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1306 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1307 op_err, 0, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 if (init_ack->num_inbound_streams == 0) { 1312 /* protocol error... send an abort */ 1313 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1314 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1315 op_err, 0, net->port); 1316 *abort_no_unlock = 1; 1317 return (-1); 1318 } 1319 if (init_ack->num_outbound_streams == 0) { 1320 /* protocol error... send an abort */ 1321 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1322 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1323 op_err, 0, net->port); 1324 *abort_no_unlock = 1; 1325 return (-1); 1326 } 1327 /* process according to association state... */ 1328 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1329 case SCTP_STATE_COOKIE_WAIT: 1330 /* this is the expected state for this chunk */ 1331 /* process the INIT-ACK parameters */ 1332 if (stcb->asoc.primary_destination->dest_state & 1333 SCTP_ADDR_UNCONFIRMED) { 1334 /* 1335 * The primary is where we sent the INIT, we can 1336 * always consider it confirmed when the INIT-ACK is 1337 * returned. Do this before we load addresses 1338 * though. 1339 */ 1340 stcb->asoc.primary_destination->dest_state &= 1341 ~SCTP_ADDR_UNCONFIRMED; 1342 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1343 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1344 } 1345 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1346 net, abort_no_unlock, vrf_id) < 0) { 1347 /* error in parsing parameters */ 1348 return (-1); 1349 } 1350 /* update our state */ 1351 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1352 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1353 1354 /* reset the RTO calc */ 1355 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1356 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1357 stcb->asoc.overall_error_count, 1358 0, 1359 SCTP_FROM_SCTP_INPUT, 1360 __LINE__); 1361 } 1362 stcb->asoc.overall_error_count = 0; 1363 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1364 /* 1365 * collapse the init timer back in case of a exponential 1366 * backoff 1367 */ 1368 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1369 stcb, net); 1370 /* 1371 * the send at the end of the inbound data processing will 1372 * cause the cookie to be sent 1373 */ 1374 break; 1375 case SCTP_STATE_SHUTDOWN_SENT: 1376 /* incorrect state... discard */ 1377 break; 1378 case SCTP_STATE_COOKIE_ECHOED: 1379 /* incorrect state... discard */ 1380 break; 1381 case SCTP_STATE_OPEN: 1382 /* incorrect state... discard */ 1383 break; 1384 case SCTP_STATE_EMPTY: 1385 case SCTP_STATE_INUSE: 1386 default: 1387 /* incorrect state... discard */ 1388 return (-1); 1389 break; 1390 } 1391 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1392 return (0); 1393} 1394 1395static struct sctp_tcb * 1396sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1397 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1398 struct sctp_inpcb *inp, struct sctp_nets **netp, 1399 struct sockaddr *init_src, int *notification, 1400 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1401 uint32_t vrf_id, uint16_t port); 1402 1403 1404/* 1405 * handle a state cookie for an existing association m: input packet mbuf 1406 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1407 * "split" mbuf and the cookie signature does not exist offset: offset into 1408 * mbuf to the cookie-echo chunk 1409 */ 1410static struct sctp_tcb * 1411sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1412 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1413 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1414 struct sockaddr *init_src, int *notification, 1415 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1416{ 1417 struct sctp_association *asoc; 1418 struct sctp_init_chunk *init_cp, init_buf; 1419 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1420 struct sctp_nets *net; 1421 struct mbuf *op_err; 1422 struct sctp_paramhdr *ph; 1423 int init_offset, initack_offset, i; 1424 int retval; 1425 int spec_flag = 0; 1426 uint32_t how_indx; 1427 1428 net = *netp; 1429 /* I know that the TCB is non-NULL from the caller */ 1430 asoc = &stcb->asoc; 1431 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1432 if (asoc->cookie_how[how_indx] == 0) 1433 break; 1434 } 1435 if (how_indx < sizeof(asoc->cookie_how)) { 1436 asoc->cookie_how[how_indx] = 1; 1437 } 1438 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1439 /* SHUTDOWN came in after sending INIT-ACK */ 1440 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1441 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1442 0, M_DONTWAIT, 1, MT_DATA); 1443 if (op_err == NULL) { 1444 /* FOOBAR */ 1445 return (NULL); 1446 } 1447 /* Set the len */ 1448 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1449 ph = mtod(op_err, struct sctp_paramhdr *); 1450 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1451 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1452 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1453 vrf_id, net->port); 1454 if (how_indx < sizeof(asoc->cookie_how)) 1455 asoc->cookie_how[how_indx] = 2; 1456 return (NULL); 1457 } 1458 /* 1459 * find and validate the INIT chunk in the cookie (peer's info) the 1460 * INIT should start after the cookie-echo header struct (chunk 1461 * header, state cookie header struct) 1462 */ 1463 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1464 1465 init_cp = (struct sctp_init_chunk *) 1466 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1467 (uint8_t *) & init_buf); 1468 if (init_cp == NULL) { 1469 /* could not pull a INIT chunk in cookie */ 1470 return (NULL); 1471 } 1472 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1473 return (NULL); 1474 } 1475 /* 1476 * find and validate the INIT-ACK chunk in the cookie (my info) the 1477 * INIT-ACK follows the INIT chunk 1478 */ 1479 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1480 initack_cp = (struct sctp_init_ack_chunk *) 1481 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1482 (uint8_t *) & initack_buf); 1483 if (initack_cp == NULL) { 1484 /* could not pull INIT-ACK chunk in cookie */ 1485 return (NULL); 1486 } 1487 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1488 return (NULL); 1489 } 1490 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1491 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1492 /* 1493 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1494 * to get into the OPEN state 1495 */ 1496 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1497 /*- 1498 * Opps, this means that we somehow generated two vtag's 1499 * the same. I.e. we did: 1500 * Us Peer 1501 * <---INIT(tag=a)------ 1502 * ----INIT-ACK(tag=t)--> 1503 * ----INIT(tag=t)------> *1 1504 * <---INIT-ACK(tag=a)--- 1505 * <----CE(tag=t)------------- *2 1506 * 1507 * At point *1 we should be generating a different 1508 * tag t'. Which means we would throw away the CE and send 1509 * ours instead. Basically this is case C (throw away side). 1510 */ 1511 if (how_indx < sizeof(asoc->cookie_how)) 1512 asoc->cookie_how[how_indx] = 17; 1513 return (NULL); 1514 1515 } 1516 switch SCTP_GET_STATE 1517 (asoc) { 1518 case SCTP_STATE_COOKIE_WAIT: 1519 case SCTP_STATE_COOKIE_ECHOED: 1520 /* 1521 * INIT was sent but got a COOKIE_ECHO with the 1522 * correct tags... just accept it...but we must 1523 * process the init so that we can make sure we have 1524 * the right seq no's. 1525 */ 1526 /* First we must process the INIT !! */ 1527 retval = sctp_process_init(init_cp, stcb); 1528 if (retval < 0) { 1529 if (how_indx < sizeof(asoc->cookie_how)) 1530 asoc->cookie_how[how_indx] = 3; 1531 return (NULL); 1532 } 1533 /* we have already processed the INIT so no problem */ 1534 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1535 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1536 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1537 /* update current state */ 1538 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1539 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1540 else 1541 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1542 1543 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1544 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1545 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1546 stcb->sctp_ep, stcb, asoc->primary_destination); 1547 } 1548 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1549 sctp_stop_all_cookie_timers(stcb); 1550 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1551 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1552 (inp->sctp_socket->so_qlimit == 0) 1553 ) { 1554#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1555 struct socket *so; 1556 1557#endif 1558 /* 1559 * Here is where collision would go if we 1560 * did a connect() and instead got a 1561 * init/init-ack/cookie done before the 1562 * init-ack came back.. 1563 */ 1564 stcb->sctp_ep->sctp_flags |= 1565 SCTP_PCB_FLAGS_CONNECTED; 1566#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1567 so = SCTP_INP_SO(stcb->sctp_ep); 1568 atomic_add_int(&stcb->asoc.refcnt, 1); 1569 SCTP_TCB_UNLOCK(stcb); 1570 SCTP_SOCKET_LOCK(so, 1); 1571 SCTP_TCB_LOCK(stcb); 1572 atomic_add_int(&stcb->asoc.refcnt, -1); 1573 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1574 SCTP_SOCKET_UNLOCK(so, 1); 1575 return (NULL); 1576 } 1577#endif 1578 soisconnected(stcb->sctp_socket); 1579#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1580 SCTP_SOCKET_UNLOCK(so, 1); 1581#endif 1582 } 1583 /* notify upper layer */ 1584 *notification = SCTP_NOTIFY_ASSOC_UP; 1585 /* 1586 * since we did not send a HB make sure we don't 1587 * double things 1588 */ 1589 net->hb_responded = 1; 1590 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1591 &cookie->time_entered, 1592 sctp_align_unsafe_makecopy, 1593 SCTP_RTT_FROM_NON_DATA); 1594 1595 if (stcb->asoc.sctp_autoclose_ticks && 1596 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1597 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1598 inp, stcb, NULL); 1599 } 1600 break; 1601 default: 1602 /* 1603 * we're in the OPEN state (or beyond), so peer must 1604 * have simply lost the COOKIE-ACK 1605 */ 1606 break; 1607 } /* end switch */ 1608 sctp_stop_all_cookie_timers(stcb); 1609 /* 1610 * We ignore the return code here.. not sure if we should 1611 * somehow abort.. but we do have an existing asoc. This 1612 * really should not fail. 1613 */ 1614 if (sctp_load_addresses_from_init(stcb, m, 1615 init_offset + sizeof(struct sctp_init_chunk), 1616 initack_offset, sh, init_src)) { 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 4; 1619 return (NULL); 1620 } 1621 /* respond with a COOKIE-ACK */ 1622 sctp_toss_old_cookies(stcb, asoc); 1623 sctp_send_cookie_ack(stcb); 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 5; 1626 return (stcb); 1627 } 1628 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1629 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1630 cookie->tie_tag_my_vtag == 0 && 1631 cookie->tie_tag_peer_vtag == 0) { 1632 /* 1633 * case C in Section 5.2.4 Table 2: XMOO silently discard 1634 */ 1635 if (how_indx < sizeof(asoc->cookie_how)) 1636 asoc->cookie_how[how_indx] = 6; 1637 return (NULL); 1638 } 1639 /* 1640 * If nat support, and the below and stcb is established, send back 1641 * a ABORT(colliding state) if we are established. 1642 */ 1643 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1644 (asoc->peer_supports_nat) && 1645 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1646 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1647 (asoc->peer_vtag == 0)))) { 1648 /* 1649 * Special case - Peer's support nat. We may have two init's 1650 * that we gave out the same tag on since one was not 1651 * established.. i.e. we get INIT from host-1 behind the nat 1652 * and we respond tag-a, we get a INIT from host-2 behind 1653 * the nat and we get tag-a again. Then we bring up host-1 1654 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1655 * Now we have colliding state. We must send an abort here 1656 * with colliding state indication. 1657 */ 1658 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1659 0, M_DONTWAIT, 1, MT_DATA); 1660 if (op_err == NULL) { 1661 /* FOOBAR */ 1662 return (NULL); 1663 } 1664 /* pre-reserve some space */ 1665#ifdef INET6 1666 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1667#else 1668 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1669#endif 1670 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1671 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1672 /* Set the len */ 1673 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1674 ph = mtod(op_err, struct sctp_paramhdr *); 1675 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1676 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1677 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1678 return (NULL); 1679 } 1680 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1681 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1682 (asoc->peer_vtag == 0))) { 1683 /* 1684 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1685 * should be ok, re-accept peer info 1686 */ 1687 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1688 /* 1689 * Extension of case C. If we hit this, then the 1690 * random number generator returned the same vtag 1691 * when we first sent our INIT-ACK and when we later 1692 * sent our INIT. The side with the seq numbers that 1693 * are different will be the one that normnally 1694 * would have hit case C. This in effect "extends" 1695 * our vtags in this collision case to be 64 bits. 1696 * The same collision could occur aka you get both 1697 * vtag and seq number the same twice in a row.. but 1698 * is much less likely. If it did happen then we 1699 * would proceed through and bring up the assoc.. we 1700 * may end up with the wrong stream setup however.. 1701 * which would be bad.. but there is no way to 1702 * tell.. until we send on a stream that does not 1703 * exist :-) 1704 */ 1705 if (how_indx < sizeof(asoc->cookie_how)) 1706 asoc->cookie_how[how_indx] = 7; 1707 1708 return (NULL); 1709 } 1710 if (how_indx < sizeof(asoc->cookie_how)) 1711 asoc->cookie_how[how_indx] = 8; 1712 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1713 sctp_stop_all_cookie_timers(stcb); 1714 /* 1715 * since we did not send a HB make sure we don't double 1716 * things 1717 */ 1718 net->hb_responded = 1; 1719 if (stcb->asoc.sctp_autoclose_ticks && 1720 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1721 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1722 NULL); 1723 } 1724 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1725 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1726 1727 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1728 /* 1729 * Ok the peer probably discarded our data (if we 1730 * echoed a cookie+data). So anything on the 1731 * sent_queue should be marked for retransmit, we 1732 * may not get something to kick us so it COULD 1733 * still take a timeout to move these.. but it can't 1734 * hurt to mark them. 1735 */ 1736 struct sctp_tmit_chunk *chk; 1737 1738 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1739 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1740 chk->sent = SCTP_DATAGRAM_RESEND; 1741 sctp_flight_size_decrease(chk); 1742 sctp_total_flight_decrease(stcb, chk); 1743 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1744 spec_flag++; 1745 } 1746 } 1747 1748 } 1749 /* process the INIT info (peer's info) */ 1750 retval = sctp_process_init(init_cp, stcb); 1751 if (retval < 0) { 1752 if (how_indx < sizeof(asoc->cookie_how)) 1753 asoc->cookie_how[how_indx] = 9; 1754 return (NULL); 1755 } 1756 if (sctp_load_addresses_from_init(stcb, m, 1757 init_offset + sizeof(struct sctp_init_chunk), 1758 initack_offset, sh, init_src)) { 1759 if (how_indx < sizeof(asoc->cookie_how)) 1760 asoc->cookie_how[how_indx] = 10; 1761 return (NULL); 1762 } 1763 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1764 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1765 *notification = SCTP_NOTIFY_ASSOC_UP; 1766 1767 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1768 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1769 (inp->sctp_socket->so_qlimit == 0)) { 1770#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1771 struct socket *so; 1772 1773#endif 1774 stcb->sctp_ep->sctp_flags |= 1775 SCTP_PCB_FLAGS_CONNECTED; 1776#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1777 so = SCTP_INP_SO(stcb->sctp_ep); 1778 atomic_add_int(&stcb->asoc.refcnt, 1); 1779 SCTP_TCB_UNLOCK(stcb); 1780 SCTP_SOCKET_LOCK(so, 1); 1781 SCTP_TCB_LOCK(stcb); 1782 atomic_add_int(&stcb->asoc.refcnt, -1); 1783 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1784 SCTP_SOCKET_UNLOCK(so, 1); 1785 return (NULL); 1786 } 1787#endif 1788 soisconnected(stcb->sctp_socket); 1789#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1790 SCTP_SOCKET_UNLOCK(so, 1); 1791#endif 1792 } 1793 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1794 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1795 else 1796 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1797 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1798 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1799 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1800 } else { 1801 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1802 } 1803 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1804 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1805 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1806 stcb->sctp_ep, stcb, asoc->primary_destination); 1807 } 1808 sctp_stop_all_cookie_timers(stcb); 1809 sctp_toss_old_cookies(stcb, asoc); 1810 sctp_send_cookie_ack(stcb); 1811 if (spec_flag) { 1812 /* 1813 * only if we have retrans set do we do this. What 1814 * this call does is get only the COOKIE-ACK out and 1815 * then when we return the normal call to 1816 * sctp_chunk_output will get the retrans out behind 1817 * this. 1818 */ 1819 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1820 } 1821 if (how_indx < sizeof(asoc->cookie_how)) 1822 asoc->cookie_how[how_indx] = 11; 1823 1824 return (stcb); 1825 } 1826 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1827 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1828 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1829 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1830 cookie->tie_tag_peer_vtag != 0) { 1831 struct sctpasochead *head; 1832 1833 if (asoc->peer_supports_nat) { 1834 /* 1835 * This is a gross gross hack. just call the 1836 * cookie_new code since we are allowing a duplicate 1837 * association. I hope this works... 1838 */ 1839 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1840 inp, netp, init_src, notification, 1841 auth_skipped, auth_offset, auth_len, 1842 vrf_id, port)); 1843 } 1844 /* 1845 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1846 */ 1847 /* temp code */ 1848 if (how_indx < sizeof(asoc->cookie_how)) 1849 asoc->cookie_how[how_indx] = 12; 1850 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1851 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1852 1853 /* notify upper layer */ 1854 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1855 atomic_add_int(&stcb->asoc.refcnt, 1); 1856 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1857 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1858 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1859 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1860 } 1861 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1862 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1863 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1864 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1865 } 1866 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1867 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1868 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1869 stcb->sctp_ep, stcb, asoc->primary_destination); 1870 1871 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1872 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1873 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1874 } 1875 asoc->pre_open_streams = 1876 ntohs(initack_cp->init.num_outbound_streams); 1877 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1878 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1879 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1880 1881 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1882 1883 asoc->str_reset_seq_in = asoc->init_seq_number; 1884 1885 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1886 if (asoc->mapping_array) { 1887 memset(asoc->mapping_array, 0, 1888 asoc->mapping_array_size); 1889 } 1890 if (asoc->nr_mapping_array) { 1891 memset(asoc->nr_mapping_array, 0, 1892 asoc->mapping_array_size); 1893 } 1894 SCTP_TCB_UNLOCK(stcb); 1895 SCTP_INP_INFO_WLOCK(); 1896 SCTP_INP_WLOCK(stcb->sctp_ep); 1897 SCTP_TCB_LOCK(stcb); 1898 atomic_add_int(&stcb->asoc.refcnt, -1); 1899 /* send up all the data */ 1900 SCTP_TCB_SEND_LOCK(stcb); 1901 1902 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1903 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1904 stcb->asoc.strmout[i].stream_no = i; 1905 stcb->asoc.strmout[i].next_sequence_sent = 0; 1906 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1907 } 1908 /* process the INIT-ACK info (my info) */ 1909 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1910 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1911 1912 /* pull from vtag hash */ 1913 LIST_REMOVE(stcb, sctp_asocs); 1914 /* re-insert to new vtag position */ 1915 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1916 SCTP_BASE_INFO(hashasocmark))]; 1917 /* 1918 * put it in the bucket in the vtag hash of assoc's for the 1919 * system 1920 */ 1921 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1922 1923 /* process the INIT info (peer's info) */ 1924 SCTP_TCB_SEND_UNLOCK(stcb); 1925 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1926 SCTP_INP_INFO_WUNLOCK(); 1927 1928 retval = sctp_process_init(init_cp, stcb); 1929 if (retval < 0) { 1930 if (how_indx < sizeof(asoc->cookie_how)) 1931 asoc->cookie_how[how_indx] = 13; 1932 1933 return (NULL); 1934 } 1935 /* 1936 * since we did not send a HB make sure we don't double 1937 * things 1938 */ 1939 net->hb_responded = 1; 1940 1941 if (sctp_load_addresses_from_init(stcb, m, 1942 init_offset + sizeof(struct sctp_init_chunk), 1943 initack_offset, sh, init_src)) { 1944 if (how_indx < sizeof(asoc->cookie_how)) 1945 asoc->cookie_how[how_indx] = 14; 1946 1947 return (NULL); 1948 } 1949 /* respond with a COOKIE-ACK */ 1950 sctp_stop_all_cookie_timers(stcb); 1951 sctp_toss_old_cookies(stcb, asoc); 1952 sctp_send_cookie_ack(stcb); 1953 if (how_indx < sizeof(asoc->cookie_how)) 1954 asoc->cookie_how[how_indx] = 15; 1955 1956 return (stcb); 1957 } 1958 if (how_indx < sizeof(asoc->cookie_how)) 1959 asoc->cookie_how[how_indx] = 16; 1960 /* all other cases... */ 1961 return (NULL); 1962} 1963 1964 1965/* 1966 * handle a state cookie for a new association m: input packet mbuf chain-- 1967 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1968 * and the cookie signature does not exist offset: offset into mbuf to the 1969 * cookie-echo chunk length: length of the cookie chunk to: where the init 1970 * was from returns a new TCB 1971 */ 1972struct sctp_tcb * 1973sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1974 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1975 struct sctp_inpcb *inp, struct sctp_nets **netp, 1976 struct sockaddr *init_src, int *notification, 1977 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1978 uint32_t vrf_id, uint16_t port) 1979{ 1980 struct sctp_tcb *stcb; 1981 struct sctp_init_chunk *init_cp, init_buf; 1982 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1983 struct sockaddr_storage sa_store; 1984 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1985 struct sctp_association *asoc; 1986 int init_offset, initack_offset, initack_limit; 1987 int retval; 1988 int error = 0; 1989 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1990 1991#ifdef INET 1992 struct sockaddr_in *sin; 1993 1994#endif 1995#ifdef INET6 1996 struct sockaddr_in6 *sin6; 1997 1998#endif 1999#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2000 struct socket *so; 2001 2002 so = SCTP_INP_SO(inp); 2003#endif 2004 2005 /* 2006 * find and validate the INIT chunk in the cookie (peer's info) the 2007 * INIT should start after the cookie-echo header struct (chunk 2008 * header, state cookie header struct) 2009 */ 2010 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2011 init_cp = (struct sctp_init_chunk *) 2012 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2013 (uint8_t *) & init_buf); 2014 if (init_cp == NULL) { 2015 /* could not pull a INIT chunk in cookie */ 2016 SCTPDBG(SCTP_DEBUG_INPUT1, 2017 "process_cookie_new: could not pull INIT chunk hdr\n"); 2018 return (NULL); 2019 } 2020 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2021 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2022 return (NULL); 2023 } 2024 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2025 /* 2026 * find and validate the INIT-ACK chunk in the cookie (my info) the 2027 * INIT-ACK follows the INIT chunk 2028 */ 2029 initack_cp = (struct sctp_init_ack_chunk *) 2030 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2031 (uint8_t *) & initack_buf); 2032 if (initack_cp == NULL) { 2033 /* could not pull INIT-ACK chunk in cookie */ 2034 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2035 return (NULL); 2036 } 2037 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2038 return (NULL); 2039 } 2040 /* 2041 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2042 * "initack_limit" value. This is because the chk_length field 2043 * includes the length of the cookie, but the cookie is omitted when 2044 * the INIT and INIT_ACK are tacked onto the cookie... 2045 */ 2046 initack_limit = offset + cookie_len; 2047 2048 /* 2049 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2050 * and popluate 2051 */ 2052 2053 /* 2054 * Here we do a trick, we set in NULL for the proc/thread argument. 2055 * We do this since in effect we only use the p argument when the 2056 * socket is unbound and we must do an implicit bind. Since we are 2057 * getting a cookie, we cannot be unbound. 2058 */ 2059 stcb = sctp_aloc_assoc(inp, init_src, &error, 2060 ntohl(initack_cp->init.initiate_tag), vrf_id, 2061 (struct thread *)NULL 2062 ); 2063 if (stcb == NULL) { 2064 struct mbuf *op_err; 2065 2066 /* memory problem? */ 2067 SCTPDBG(SCTP_DEBUG_INPUT1, 2068 "process_cookie_new: no room for another TCB!\n"); 2069 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2070 2071 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2072 sh, op_err, vrf_id, port); 2073 return (NULL); 2074 } 2075 /* get the correct sctp_nets */ 2076 if (netp) 2077 *netp = sctp_findnet(stcb, init_src); 2078 2079 asoc = &stcb->asoc; 2080 /* get scope variables out of cookie */ 2081 asoc->ipv4_local_scope = cookie->ipv4_scope; 2082 asoc->site_scope = cookie->site_scope; 2083 asoc->local_scope = cookie->local_scope; 2084 asoc->loopback_scope = cookie->loopback_scope; 2085 2086 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2087 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2088 struct mbuf *op_err; 2089 2090 /* 2091 * Houston we have a problem. The EP changed while the 2092 * cookie was in flight. Only recourse is to abort the 2093 * association. 2094 */ 2095 atomic_add_int(&stcb->asoc.refcnt, 1); 2096 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2097 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2098 sh, op_err, vrf_id, port); 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, 2105 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2106#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2107 SCTP_SOCKET_UNLOCK(so, 1); 2108#endif 2109 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2110 return (NULL); 2111 } 2112 /* process the INIT-ACK info (my info) */ 2113 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2114 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2115 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2116 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2117 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2118 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2119 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2120 asoc->str_reset_seq_in = asoc->init_seq_number; 2121 2122 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2123 2124 /* process the INIT info (peer's info) */ 2125 if (netp) 2126 retval = sctp_process_init(init_cp, stcb); 2127 else 2128 retval = 0; 2129 if (retval < 0) { 2130 atomic_add_int(&stcb->asoc.refcnt, 1); 2131#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135#endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2137#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2138 SCTP_SOCKET_UNLOCK(so, 1); 2139#endif 2140 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2141 return (NULL); 2142 } 2143 /* load all addresses */ 2144 if (sctp_load_addresses_from_init(stcb, m, 2145 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2146 init_src)) { 2147 atomic_add_int(&stcb->asoc.refcnt, 1); 2148#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2149 SCTP_TCB_UNLOCK(stcb); 2150 SCTP_SOCKET_LOCK(so, 1); 2151 SCTP_TCB_LOCK(stcb); 2152#endif 2153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2154#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2155 SCTP_SOCKET_UNLOCK(so, 1); 2156#endif 2157 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2158 return (NULL); 2159 } 2160 /* 2161 * verify any preceding AUTH chunk that was skipped 2162 */ 2163 /* pull the local authentication parameters from the cookie/init-ack */ 2164 sctp_auth_get_cookie_params(stcb, m, 2165 initack_offset + sizeof(struct sctp_init_ack_chunk), 2166 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2167 if (auth_skipped) { 2168 struct sctp_auth_chunk *auth; 2169 2170 auth = (struct sctp_auth_chunk *) 2171 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2172 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2173 /* auth HMAC failed, dump the assoc and packet */ 2174 SCTPDBG(SCTP_DEBUG_AUTH1, 2175 "COOKIE-ECHO: AUTH failed\n"); 2176 atomic_add_int(&stcb->asoc.refcnt, 1); 2177#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2178 SCTP_TCB_UNLOCK(stcb); 2179 SCTP_SOCKET_LOCK(so, 1); 2180 SCTP_TCB_LOCK(stcb); 2181#endif 2182 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2183#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2184 SCTP_SOCKET_UNLOCK(so, 1); 2185#endif 2186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2187 return (NULL); 2188 } else { 2189 /* remaining chunks checked... good to go */ 2190 stcb->asoc.authenticated = 1; 2191 } 2192 } 2193 /* update current state */ 2194 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2195 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2196 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2197 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2198 stcb->sctp_ep, stcb, asoc->primary_destination); 2199 } 2200 sctp_stop_all_cookie_timers(stcb); 2201 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2202 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2203 2204 /* 2205 * if we're doing ASCONFs, check to see if we have any new local 2206 * addresses that need to get added to the peer (eg. addresses 2207 * changed while cookie echo in flight). This needs to be done 2208 * after we go to the OPEN state to do the correct asconf 2209 * processing. else, make sure we have the correct addresses in our 2210 * lists 2211 */ 2212 2213 /* warning, we re-use sin, sin6, sa_store here! */ 2214 /* pull in local_address (our "from" address) */ 2215 switch (cookie->laddr_type) { 2216#ifdef INET 2217 case SCTP_IPV4_ADDRESS: 2218 /* source addr is IPv4 */ 2219 sin = (struct sockaddr_in *)initack_src; 2220 memset(sin, 0, sizeof(*sin)); 2221 sin->sin_family = AF_INET; 2222 sin->sin_len = sizeof(struct sockaddr_in); 2223 sin->sin_addr.s_addr = cookie->laddress[0]; 2224 break; 2225#endif 2226#ifdef INET6 2227 case SCTP_IPV6_ADDRESS: 2228 /* source addr is IPv6 */ 2229 sin6 = (struct sockaddr_in6 *)initack_src; 2230 memset(sin6, 0, sizeof(*sin6)); 2231 sin6->sin6_family = AF_INET6; 2232 sin6->sin6_len = sizeof(struct sockaddr_in6); 2233 sin6->sin6_scope_id = cookie->scope_id; 2234 memcpy(&sin6->sin6_addr, cookie->laddress, 2235 sizeof(sin6->sin6_addr)); 2236 break; 2237#endif 2238 default: 2239 atomic_add_int(&stcb->asoc.refcnt, 1); 2240#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2241 SCTP_TCB_UNLOCK(stcb); 2242 SCTP_SOCKET_LOCK(so, 1); 2243 SCTP_TCB_LOCK(stcb); 2244#endif 2245 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2246#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2247 SCTP_SOCKET_UNLOCK(so, 1); 2248#endif 2249 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2250 return (NULL); 2251 } 2252 2253 /* set up to notify upper layer */ 2254 *notification = SCTP_NOTIFY_ASSOC_UP; 2255 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2256 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2257 (inp->sctp_socket->so_qlimit == 0)) { 2258 /* 2259 * This is an endpoint that called connect() how it got a 2260 * cookie that is NEW is a bit of a mystery. It must be that 2261 * the INIT was sent, but before it got there.. a complete 2262 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2263 * should have went to the other code.. not here.. oh well.. 2264 * a bit of protection is worth having.. 2265 */ 2266 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2267#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269 SCTP_TCB_UNLOCK(stcb); 2270 SCTP_SOCKET_LOCK(so, 1); 2271 SCTP_TCB_LOCK(stcb); 2272 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2273 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2274 SCTP_SOCKET_UNLOCK(so, 1); 2275 return (NULL); 2276 } 2277#endif 2278 soisconnected(stcb->sctp_socket); 2279#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2280 SCTP_SOCKET_UNLOCK(so, 1); 2281#endif 2282 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2283 (inp->sctp_socket->so_qlimit)) { 2284 /* 2285 * We don't want to do anything with this one. Since it is 2286 * the listening guy. The timer will get started for 2287 * accepted connections in the caller. 2288 */ 2289 ; 2290 } 2291 /* since we did not send a HB make sure we don't double things */ 2292 if ((netp) && (*netp)) 2293 (*netp)->hb_responded = 1; 2294 2295 if (stcb->asoc.sctp_autoclose_ticks && 2296 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2297 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2298 } 2299 /* calculate the RTT */ 2300 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2301 if ((netp) && (*netp)) { 2302 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2303 &cookie->time_entered, sctp_align_unsafe_makecopy, 2304 SCTP_RTT_FROM_NON_DATA); 2305 } 2306 /* respond with a COOKIE-ACK */ 2307 sctp_send_cookie_ack(stcb); 2308 2309 /* 2310 * check the address lists for any ASCONFs that need to be sent 2311 * AFTER the cookie-ack is sent 2312 */ 2313 sctp_check_address_list(stcb, m, 2314 initack_offset + sizeof(struct sctp_init_ack_chunk), 2315 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2316 initack_src, cookie->local_scope, cookie->site_scope, 2317 cookie->ipv4_scope, cookie->loopback_scope); 2318 2319 2320 return (stcb); 2321} 2322 2323/* 2324 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2325 * we NEED to make sure we are not already using the vtag. If so we 2326 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2327 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2328 SCTP_BASE_INFO(hashasocmark))]; 2329 LIST_FOREACH(stcb, head, sctp_asocs) { 2330 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2331 -- SEND ABORT - TRY AGAIN -- 2332 } 2333 } 2334*/ 2335 2336/* 2337 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2338 * existing (non-NULL) TCB 2339 */ 2340static struct mbuf * 2341sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2342 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2343 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2344 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2345 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2346{ 2347 struct sctp_state_cookie *cookie; 2348 struct sctp_tcb *l_stcb = *stcb; 2349 struct sctp_inpcb *l_inp; 2350 struct sockaddr *to; 2351 struct sctp_pcb *ep; 2352 struct mbuf *m_sig; 2353 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2354 uint8_t *sig; 2355 uint8_t cookie_ok = 0; 2356 unsigned int size_of_pkt, sig_offset, cookie_offset; 2357 unsigned int cookie_len; 2358 struct timeval now; 2359 struct timeval time_expires; 2360 struct sockaddr_storage dest_store; 2361 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2362 struct ip *iph; 2363 int notification = 0; 2364 struct sctp_nets *netl; 2365 int had_a_existing_tcb = 0; 2366 int send_int_conf = 0; 2367 2368#ifdef INET 2369 struct sockaddr_in sin; 2370 2371#endif 2372#ifdef INET6 2373 struct sockaddr_in6 sin6; 2374 2375#endif 2376 2377 SCTPDBG(SCTP_DEBUG_INPUT2, 2378 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2379 2380 if (inp_p == NULL) { 2381 return (NULL); 2382 } 2383 /* First get the destination address setup too. */ 2384 iph = mtod(m, struct ip *); 2385 switch (iph->ip_v) { 2386#ifdef INET 2387 case IPVERSION: 2388 { 2389 /* its IPv4 */ 2390 struct sockaddr_in *lsin; 2391 2392 lsin = (struct sockaddr_in *)(localep_sa); 2393 memset(lsin, 0, sizeof(*lsin)); 2394 lsin->sin_family = AF_INET; 2395 lsin->sin_len = sizeof(*lsin); 2396 lsin->sin_port = sh->dest_port; 2397 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2398 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2399 break; 2400 } 2401#endif 2402#ifdef INET6 2403 case IPV6_VERSION >> 4: 2404 { 2405 /* its IPv6 */ 2406 struct ip6_hdr *ip6; 2407 struct sockaddr_in6 *lsin6; 2408 2409 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2410 memset(lsin6, 0, sizeof(*lsin6)); 2411 lsin6->sin6_family = AF_INET6; 2412 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2413 ip6 = mtod(m, struct ip6_hdr *); 2414 lsin6->sin6_port = sh->dest_port; 2415 lsin6->sin6_addr = ip6->ip6_dst; 2416 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2417 break; 2418 } 2419#endif 2420 default: 2421 return (NULL); 2422 } 2423 2424 cookie = &cp->cookie; 2425 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2426 cookie_len = ntohs(cp->ch.chunk_length); 2427 2428 if ((cookie->peerport != sh->src_port) && 2429 (cookie->myport != sh->dest_port) && 2430 (cookie->my_vtag != sh->v_tag)) { 2431 /* 2432 * invalid ports or bad tag. Note that we always leave the 2433 * v_tag in the header in network order and when we stored 2434 * it in the my_vtag slot we also left it in network order. 2435 * This maintains the match even though it may be in the 2436 * opposite byte order of the machine :-> 2437 */ 2438 return (NULL); 2439 } 2440 if (cookie_len > size_of_pkt || 2441 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2442 sizeof(struct sctp_init_chunk) + 2443 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2444 /* cookie too long! or too small */ 2445 return (NULL); 2446 } 2447 /* 2448 * split off the signature into its own mbuf (since it should not be 2449 * calculated in the sctp_hmac_m() call). 2450 */ 2451 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2452 if (sig_offset > size_of_pkt) { 2453 /* packet not correct size! */ 2454 /* XXX this may already be accounted for earlier... */ 2455 return (NULL); 2456 } 2457 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2458 if (m_sig == NULL) { 2459 /* out of memory or ?? */ 2460 return (NULL); 2461 } 2462#ifdef SCTP_MBUF_LOGGING 2463 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2464 struct mbuf *mat; 2465 2466 mat = m_sig; 2467 while (mat) { 2468 if (SCTP_BUF_IS_EXTENDED(mat)) { 2469 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2470 } 2471 mat = SCTP_BUF_NEXT(mat); 2472 } 2473 } 2474#endif 2475 2476 /* 2477 * compute the signature/digest for the cookie 2478 */ 2479 ep = &(*inp_p)->sctp_ep; 2480 l_inp = *inp_p; 2481 if (l_stcb) { 2482 SCTP_TCB_UNLOCK(l_stcb); 2483 } 2484 SCTP_INP_RLOCK(l_inp); 2485 if (l_stcb) { 2486 SCTP_TCB_LOCK(l_stcb); 2487 } 2488 /* which cookie is it? */ 2489 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2490 (ep->current_secret_number != ep->last_secret_number)) { 2491 /* it's the old cookie */ 2492 (void)sctp_hmac_m(SCTP_HMAC, 2493 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2494 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2495 } else { 2496 /* it's the current cookie */ 2497 (void)sctp_hmac_m(SCTP_HMAC, 2498 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2499 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2500 } 2501 /* get the signature */ 2502 SCTP_INP_RUNLOCK(l_inp); 2503 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2504 if (sig == NULL) { 2505 /* couldn't find signature */ 2506 sctp_m_freem(m_sig); 2507 return (NULL); 2508 } 2509 /* compare the received digest with the computed digest */ 2510 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2511 /* try the old cookie? */ 2512 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2513 (ep->current_secret_number != ep->last_secret_number)) { 2514 /* compute digest with old */ 2515 (void)sctp_hmac_m(SCTP_HMAC, 2516 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2517 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2518 /* compare */ 2519 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2520 cookie_ok = 1; 2521 } 2522 } else { 2523 cookie_ok = 1; 2524 } 2525 2526 /* 2527 * Now before we continue we must reconstruct our mbuf so that 2528 * normal processing of any other chunks will work. 2529 */ 2530 { 2531 struct mbuf *m_at; 2532 2533 m_at = m; 2534 while (SCTP_BUF_NEXT(m_at) != NULL) { 2535 m_at = SCTP_BUF_NEXT(m_at); 2536 } 2537 SCTP_BUF_NEXT(m_at) = m_sig; 2538 } 2539 2540 if (cookie_ok == 0) { 2541 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2542 SCTPDBG(SCTP_DEBUG_INPUT2, 2543 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2544 (uint32_t) offset, cookie_offset, sig_offset); 2545 return (NULL); 2546 } 2547 /* 2548 * check the cookie timestamps to be sure it's not stale 2549 */ 2550 (void)SCTP_GETTIME_TIMEVAL(&now); 2551 /* Expire time is in Ticks, so we convert to seconds */ 2552 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2553 time_expires.tv_usec = cookie->time_entered.tv_usec; 2554 /* 2555 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2556 * is undefined. 2557 */ 2558 if (timevalcmp(&now, &time_expires, >)) { 2559 /* cookie is stale! */ 2560 struct mbuf *op_err; 2561 struct sctp_stale_cookie_msg *scm; 2562 uint32_t tim; 2563 2564 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2565 0, M_DONTWAIT, 1, MT_DATA); 2566 if (op_err == NULL) { 2567 /* FOOBAR */ 2568 return (NULL); 2569 } 2570 /* Set the len */ 2571 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2572 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2573 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2574 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2575 (sizeof(uint32_t)))); 2576 /* seconds to usec */ 2577 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2578 /* add in usec */ 2579 if (tim == 0) 2580 tim = now.tv_usec - cookie->time_entered.tv_usec; 2581 scm->time_usec = htonl(tim); 2582 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2583 vrf_id, port); 2584 return (NULL); 2585 } 2586 /* 2587 * Now we must see with the lookup address if we have an existing 2588 * asoc. This will only happen if we were in the COOKIE-WAIT state 2589 * and a INIT collided with us and somewhere the peer sent the 2590 * cookie on another address besides the single address our assoc 2591 * had for him. In this case we will have one of the tie-tags set at 2592 * least AND the address field in the cookie can be used to look it 2593 * up. 2594 */ 2595 to = NULL; 2596 switch (cookie->addr_type) { 2597#ifdef INET6 2598 case SCTP_IPV6_ADDRESS: 2599 memset(&sin6, 0, sizeof(sin6)); 2600 sin6.sin6_family = AF_INET6; 2601 sin6.sin6_len = sizeof(sin6); 2602 sin6.sin6_port = sh->src_port; 2603 sin6.sin6_scope_id = cookie->scope_id; 2604 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2605 sizeof(sin6.sin6_addr.s6_addr)); 2606 to = (struct sockaddr *)&sin6; 2607 break; 2608#endif 2609#ifdef INET 2610 case SCTP_IPV4_ADDRESS: 2611 memset(&sin, 0, sizeof(sin)); 2612 sin.sin_family = AF_INET; 2613 sin.sin_len = sizeof(sin); 2614 sin.sin_port = sh->src_port; 2615 sin.sin_addr.s_addr = cookie->address[0]; 2616 to = (struct sockaddr *)&sin; 2617 break; 2618#endif 2619 default: 2620 /* This should not happen */ 2621 return (NULL); 2622 } 2623 if ((*stcb == NULL) && to) { 2624 /* Yep, lets check */ 2625 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2626 if (*stcb == NULL) { 2627 /* 2628 * We should have only got back the same inp. If we 2629 * got back a different ep we have a problem. The 2630 * original findep got back l_inp and now 2631 */ 2632 if (l_inp != *inp_p) { 2633 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2634 } 2635 } else { 2636 if (*locked_tcb == NULL) { 2637 /* 2638 * In this case we found the assoc only 2639 * after we locked the create lock. This 2640 * means we are in a colliding case and we 2641 * must make sure that we unlock the tcb if 2642 * its one of the cases where we throw away 2643 * the incoming packets. 2644 */ 2645 *locked_tcb = *stcb; 2646 2647 /* 2648 * We must also increment the inp ref count 2649 * since the ref_count flags was set when we 2650 * did not find the TCB, now we found it 2651 * which reduces the refcount.. we must 2652 * raise it back out to balance it all :-) 2653 */ 2654 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2655 if ((*stcb)->sctp_ep != l_inp) { 2656 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2657 (*stcb)->sctp_ep, l_inp); 2658 } 2659 } 2660 } 2661 } 2662 if (to == NULL) { 2663 return (NULL); 2664 } 2665 cookie_len -= SCTP_SIGNATURE_SIZE; 2666 if (*stcb == NULL) { 2667 /* this is the "normal" case... get a new TCB */ 2668 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2669 cookie_len, *inp_p, netp, to, ¬ification, 2670 auth_skipped, auth_offset, auth_len, vrf_id, port); 2671 } else { 2672 /* this is abnormal... cookie-echo on existing TCB */ 2673 had_a_existing_tcb = 1; 2674 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2675 cookie, cookie_len, *inp_p, *stcb, netp, to, 2676 ¬ification, vrf_id, auth_skipped, auth_offset, auth_len, port); 2677 } 2678 2679 if (*stcb == NULL) { 2680 /* still no TCB... must be bad cookie-echo */ 2681 return (NULL); 2682 } 2683 if ((*netp != NULL) && (m->m_flags & M_FLOWID)) { 2684 (*netp)->flowid = m->m_pkthdr.flowid; 2685#ifdef INVARIANTS 2686 (*netp)->flowidset = 1; 2687#endif 2688 } 2689 /* 2690 * Ok, we built an association so confirm the address we sent the 2691 * INIT-ACK to. 2692 */ 2693 netl = sctp_findnet(*stcb, to); 2694 /* 2695 * This code should in theory NOT run but 2696 */ 2697 if (netl == NULL) { 2698 /* TSNH! Huh, why do I need to add this address here? */ 2699 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2700 return (NULL); 2701 } 2702 netl = sctp_findnet(*stcb, to); 2703 } 2704 if (netl) { 2705 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2706 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2707 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2708 netl); 2709 send_int_conf = 1; 2710 } 2711 } 2712 sctp_start_net_timers(*stcb); 2713 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2714 if (!had_a_existing_tcb || 2715 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2716 /* 2717 * If we have a NEW cookie or the connect never 2718 * reached the connected state during collision we 2719 * must do the TCP accept thing. 2720 */ 2721 struct socket *so, *oso; 2722 struct sctp_inpcb *inp; 2723 2724 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2725 /* 2726 * For a restart we will keep the same 2727 * socket, no need to do anything. I THINK!! 2728 */ 2729 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2730 if (send_int_conf) { 2731 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2732 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2733 } 2734 return (m); 2735 } 2736 oso = (*inp_p)->sctp_socket; 2737 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2738 SCTP_TCB_UNLOCK((*stcb)); 2739 CURVNET_SET(oso->so_vnet); 2740 so = sonewconn(oso, 0 2741 ); 2742 CURVNET_RESTORE(); 2743 SCTP_TCB_LOCK((*stcb)); 2744 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2745 2746 if (so == NULL) { 2747 struct mbuf *op_err; 2748 2749#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2750 struct socket *pcb_so; 2751 2752#endif 2753 /* Too many sockets */ 2754 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2755 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2756 sctp_abort_association(*inp_p, NULL, m, iphlen, 2757 sh, op_err, vrf_id, port); 2758#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2759 pcb_so = SCTP_INP_SO(*inp_p); 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 SCTP_SOCKET_LOCK(pcb_so, 1); 2763 SCTP_TCB_LOCK((*stcb)); 2764 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2765#endif 2766 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2767#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2768 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2769#endif 2770 return (NULL); 2771 } 2772 inp = (struct sctp_inpcb *)so->so_pcb; 2773 SCTP_INP_INCR_REF(inp); 2774 /* 2775 * We add the unbound flag here so that if we get an 2776 * soabort() before we get the move_pcb done, we 2777 * will properly cleanup. 2778 */ 2779 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2780 SCTP_PCB_FLAGS_CONNECTED | 2781 SCTP_PCB_FLAGS_IN_TCPPOOL | 2782 SCTP_PCB_FLAGS_UNBOUND | 2783 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2784 SCTP_PCB_FLAGS_DONT_WAKE); 2785 inp->sctp_features = (*inp_p)->sctp_features; 2786 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2787 inp->sctp_socket = so; 2788 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2789 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2790 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2791 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2792 inp->sctp_context = (*inp_p)->sctp_context; 2793 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2794 inp->inp_starting_point_for_iterator = NULL; 2795 /* 2796 * copy in the authentication parameters from the 2797 * original endpoint 2798 */ 2799 if (inp->sctp_ep.local_hmacs) 2800 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2801 inp->sctp_ep.local_hmacs = 2802 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2803 if (inp->sctp_ep.local_auth_chunks) 2804 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2805 inp->sctp_ep.local_auth_chunks = 2806 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2807 2808 /* 2809 * Now we must move it from one hash table to 2810 * another and get the tcb in the right place. 2811 */ 2812 2813 /* 2814 * This is where the one-2-one socket is put into 2815 * the accept state waiting for the accept! 2816 */ 2817 if (*stcb) { 2818 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2819 } 2820 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2821 2822 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2823 SCTP_TCB_UNLOCK((*stcb)); 2824 2825 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2826 0); 2827 SCTP_TCB_LOCK((*stcb)); 2828 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2829 2830 2831 /* 2832 * now we must check to see if we were aborted while 2833 * the move was going on and the lock/unlock 2834 * happened. 2835 */ 2836 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2837 /* 2838 * yep it was, we leave the assoc attached 2839 * to the socket since the sctp_inpcb_free() 2840 * call will send an abort for us. 2841 */ 2842 SCTP_INP_DECR_REF(inp); 2843 return (NULL); 2844 } 2845 SCTP_INP_DECR_REF(inp); 2846 /* Switch over to the new guy */ 2847 *inp_p = inp; 2848 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2849 if (send_int_conf) { 2850 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2851 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2852 } 2853 /* 2854 * Pull it from the incomplete queue and wake the 2855 * guy 2856 */ 2857#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2858 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2859 SCTP_TCB_UNLOCK((*stcb)); 2860 SCTP_SOCKET_LOCK(so, 1); 2861#endif 2862 soisconnected(so); 2863#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2864 SCTP_TCB_LOCK((*stcb)); 2865 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2866 SCTP_SOCKET_UNLOCK(so, 1); 2867#endif 2868 return (m); 2869 } 2870 } 2871 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) { 2872 if (notification) { 2873 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2874 } 2875 if (send_int_conf) { 2876 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2877 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2878 } 2879 } 2880 return (m); 2881} 2882 2883static void 2884sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2885 struct sctp_tcb *stcb, struct sctp_nets *net) 2886{ 2887 /* cp must not be used, others call this without a c-ack :-) */ 2888 struct sctp_association *asoc; 2889 2890 SCTPDBG(SCTP_DEBUG_INPUT2, 2891 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2892 if (stcb == NULL) 2893 return; 2894 2895 asoc = &stcb->asoc; 2896 2897 sctp_stop_all_cookie_timers(stcb); 2898 /* process according to association state */ 2899 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2900 /* state change only needed when I am in right state */ 2901 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2902 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2903 sctp_start_net_timers(stcb); 2904 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2905 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2906 stcb->sctp_ep, stcb, asoc->primary_destination); 2907 2908 } 2909 /* update RTO */ 2910 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2911 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2912 if (asoc->overall_error_count == 0) { 2913 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2914 &asoc->time_entered, sctp_align_safe_nocopy, 2915 SCTP_RTT_FROM_NON_DATA); 2916 } 2917 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2918 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2919 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2920 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2921#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2922 struct socket *so; 2923 2924#endif 2925 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2926#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2927 so = SCTP_INP_SO(stcb->sctp_ep); 2928 atomic_add_int(&stcb->asoc.refcnt, 1); 2929 SCTP_TCB_UNLOCK(stcb); 2930 SCTP_SOCKET_LOCK(so, 1); 2931 SCTP_TCB_LOCK(stcb); 2932 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2933#endif 2934 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2935 soisconnected(stcb->sctp_socket); 2936 } 2937#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2938 SCTP_SOCKET_UNLOCK(so, 1); 2939#endif 2940 } 2941 /* 2942 * since we did not send a HB make sure we don't double 2943 * things 2944 */ 2945 net->hb_responded = 1; 2946 2947 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2948 /* 2949 * We don't need to do the asconf thing, nor hb or 2950 * autoclose if the socket is closed. 2951 */ 2952 goto closed_socket; 2953 } 2954 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2955 stcb, net); 2956 2957 2958 if (stcb->asoc.sctp_autoclose_ticks && 2959 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2960 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2961 stcb->sctp_ep, stcb, NULL); 2962 } 2963 /* 2964 * send ASCONF if parameters are pending and ASCONFs are 2965 * allowed (eg. addresses changed when init/cookie echo were 2966 * in flight) 2967 */ 2968 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2969 (stcb->asoc.peer_supports_asconf) && 2970 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2971#ifdef SCTP_TIMER_BASED_ASCONF 2972 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2973 stcb->sctp_ep, stcb, 2974 stcb->asoc.primary_destination); 2975#else 2976 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2977 SCTP_ADDR_NOT_LOCKED); 2978#endif 2979 } 2980 } 2981closed_socket: 2982 /* Toss the cookie if I can */ 2983 sctp_toss_old_cookies(stcb, asoc); 2984 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2985 /* Restart the timer if we have pending data */ 2986 struct sctp_tmit_chunk *chk; 2987 2988 chk = TAILQ_FIRST(&asoc->sent_queue); 2989 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2990 } 2991} 2992 2993static void 2994sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2995 struct sctp_tcb *stcb) 2996{ 2997 struct sctp_nets *net; 2998 struct sctp_tmit_chunk *lchk; 2999 struct sctp_ecne_chunk bkup; 3000 uint8_t override_bit; 3001 uint32_t tsn, window_data_tsn; 3002 int len; 3003 unsigned int pkt_cnt; 3004 3005 len = ntohs(cp->ch.chunk_length); 3006 if ((len != sizeof(struct sctp_ecne_chunk)) && 3007 (len != sizeof(struct old_sctp_ecne_chunk))) { 3008 return; 3009 } 3010 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3011 /* Its the old format */ 3012 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3013 bkup.num_pkts_since_cwr = htonl(1); 3014 cp = &bkup; 3015 } 3016 SCTP_STAT_INCR(sctps_recvecne); 3017 tsn = ntohl(cp->tsn); 3018 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3019 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3020 if (lchk == NULL) { 3021 window_data_tsn = stcb->asoc.sending_seq - 1; 3022 } else { 3023 window_data_tsn = lchk->rec.data.TSN_seq; 3024 } 3025 3026 /* Find where it was sent to if possible. */ 3027 net = NULL; 3028 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3029 if (lchk->rec.data.TSN_seq == tsn) { 3030 net = lchk->whoTo; 3031 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3032 break; 3033 } 3034 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3035 break; 3036 } 3037 } 3038 if (net == NULL) { 3039 /* 3040 * What to do. A previous send of a CWR was possibly lost. 3041 * See how old it is, we may have it marked on the actual 3042 * net. 3043 */ 3044 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3045 if (tsn == net->last_cwr_tsn) { 3046 /* Found him, send it off */ 3047 break; 3048 } 3049 } 3050 if (net == NULL) { 3051 /* 3052 * If we reach here, we need to send a special CWR 3053 * that says hey, we did this a long time ago and 3054 * you lost the response. 3055 */ 3056 net = TAILQ_FIRST(&stcb->asoc.nets); 3057 if (net == NULL) { 3058 /* TSNH */ 3059 return; 3060 } 3061 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3062 } else { 3063 override_bit = 0; 3064 } 3065 } else { 3066 override_bit = 0; 3067 } 3068 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3069 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3070 /* 3071 * JRS - Use the congestion control given in the pluggable 3072 * CC module 3073 */ 3074 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3075 /* 3076 * We reduce once every RTT. So we will only lower cwnd at 3077 * the next sending seq i.e. the window_data_tsn 3078 */ 3079 net->cwr_window_tsn = window_data_tsn; 3080 net->ecn_ce_pkt_cnt += pkt_cnt; 3081 net->lost_cnt = pkt_cnt; 3082 net->last_cwr_tsn = tsn; 3083 } else { 3084 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3085 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3086 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3087 /* 3088 * Another loss in the same window update how many 3089 * marks/packets lost we have had. 3090 */ 3091 int cnt = 1; 3092 3093 if (pkt_cnt > net->lost_cnt) { 3094 /* Should be the case */ 3095 cnt = (pkt_cnt - net->lost_cnt); 3096 net->ecn_ce_pkt_cnt += cnt; 3097 } 3098 net->lost_cnt = pkt_cnt; 3099 net->last_cwr_tsn = tsn; 3100 /* 3101 * Most CC functions will ignore this call, since we 3102 * are in-window yet of the initial CE the peer saw. 3103 */ 3104 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3105 } 3106 } 3107 /* 3108 * We always send a CWR this way if our previous one was lost our 3109 * peer will get an update, or if it is not time again to reduce we 3110 * still get the cwr to the peer. Note we set the override when we 3111 * could not find the TSN on the chunk or the destination network. 3112 */ 3113 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3114} 3115 3116static void 3117sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3118{ 3119 /* 3120 * Here we get a CWR from the peer. We must look in the outqueue and 3121 * make sure that we have a covered ECNE in teh control chunk part. 3122 * If so remove it. 3123 */ 3124 struct sctp_tmit_chunk *chk; 3125 struct sctp_ecne_chunk *ecne; 3126 int override; 3127 uint32_t cwr_tsn; 3128 3129 cwr_tsn = ntohl(cp->tsn); 3130 3131 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3132 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3133 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3134 continue; 3135 } 3136 if ((override == 0) && (chk->whoTo != net)) { 3137 /* Must be from the right src unless override is set */ 3138 continue; 3139 } 3140 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3141 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3142 /* this covers this ECNE, we can remove it */ 3143 stcb->asoc.ecn_echo_cnt_onq--; 3144 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3145 sctp_next); 3146 if (chk->data) { 3147 sctp_m_freem(chk->data); 3148 chk->data = NULL; 3149 } 3150 stcb->asoc.ctrl_queue_cnt--; 3151 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3152 if (override == 0) { 3153 break; 3154 } 3155 } 3156 } 3157} 3158 3159static void 3160sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3161 struct sctp_tcb *stcb, struct sctp_nets *net) 3162{ 3163 struct sctp_association *asoc; 3164 3165#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3166 struct socket *so; 3167 3168#endif 3169 3170 SCTPDBG(SCTP_DEBUG_INPUT2, 3171 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3172 if (stcb == NULL) 3173 return; 3174 3175 asoc = &stcb->asoc; 3176 /* process according to association state */ 3177 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3178 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3179 SCTPDBG(SCTP_DEBUG_INPUT2, 3180 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3181 SCTP_TCB_UNLOCK(stcb); 3182 return; 3183 } 3184 /* notify upper layer protocol */ 3185 if (stcb->sctp_socket) { 3186 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3187 /* are the queues empty? they should be */ 3188 if (!TAILQ_EMPTY(&asoc->send_queue) || 3189 !TAILQ_EMPTY(&asoc->sent_queue) || 3190 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3191 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3192 } 3193 } 3194 /* stop the timer */ 3195 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3196 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3197 /* free the TCB */ 3198 SCTPDBG(SCTP_DEBUG_INPUT2, 3199 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3200#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3201 so = SCTP_INP_SO(stcb->sctp_ep); 3202 atomic_add_int(&stcb->asoc.refcnt, 1); 3203 SCTP_TCB_UNLOCK(stcb); 3204 SCTP_SOCKET_LOCK(so, 1); 3205 SCTP_TCB_LOCK(stcb); 3206 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3207#endif 3208 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3209#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3210 SCTP_SOCKET_UNLOCK(so, 1); 3211#endif 3212 return; 3213} 3214 3215static int 3216process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3217 struct sctp_nets *net, uint8_t flg) 3218{ 3219 switch (desc->chunk_type) { 3220 case SCTP_DATA: 3221 /* find the tsn to resend (possibly */ 3222 { 3223 uint32_t tsn; 3224 struct sctp_tmit_chunk *tp1; 3225 3226 tsn = ntohl(desc->tsn_ifany); 3227 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3228 if (tp1->rec.data.TSN_seq == tsn) { 3229 /* found it */ 3230 break; 3231 } 3232 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3233 /* not found */ 3234 tp1 = NULL; 3235 break; 3236 } 3237 } 3238 if (tp1 == NULL) { 3239 /* 3240 * Do it the other way , aka without paying 3241 * attention to queue seq order. 3242 */ 3243 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3244 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3245 if (tp1->rec.data.TSN_seq == tsn) { 3246 /* found it */ 3247 break; 3248 } 3249 } 3250 } 3251 if (tp1 == NULL) { 3252 SCTP_STAT_INCR(sctps_pdrptsnnf); 3253 } 3254 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3255 uint8_t *ddp; 3256 3257 if (((flg & SCTP_BADCRC) == 0) && 3258 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3259 return (0); 3260 } 3261 if ((stcb->asoc.peers_rwnd == 0) && 3262 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3263 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3264 return (0); 3265 } 3266 if (stcb->asoc.peers_rwnd == 0 && 3267 (flg & SCTP_FROM_MIDDLE_BOX)) { 3268 SCTP_STAT_INCR(sctps_pdrpdizrw); 3269 return (0); 3270 } 3271 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3272 sizeof(struct sctp_data_chunk)); 3273 { 3274 unsigned int iii; 3275 3276 for (iii = 0; iii < sizeof(desc->data_bytes); 3277 iii++) { 3278 if (ddp[iii] != desc->data_bytes[iii]) { 3279 SCTP_STAT_INCR(sctps_pdrpbadd); 3280 return (-1); 3281 } 3282 } 3283 } 3284 3285 if (tp1->do_rtt) { 3286 /* 3287 * this guy had a RTO calculation 3288 * pending on it, cancel it 3289 */ 3290 if (tp1->whoTo->rto_needed == 0) { 3291 tp1->whoTo->rto_needed = 1; 3292 } 3293 tp1->do_rtt = 0; 3294 } 3295 SCTP_STAT_INCR(sctps_pdrpmark); 3296 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3297 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3298 /* 3299 * mark it as if we were doing a FR, since 3300 * we will be getting gap ack reports behind 3301 * the info from the router. 3302 */ 3303 tp1->rec.data.doing_fast_retransmit = 1; 3304 /* 3305 * mark the tsn with what sequences can 3306 * cause a new FR. 3307 */ 3308 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3309 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3310 } else { 3311 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3312 } 3313 3314 /* restart the timer */ 3315 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3316 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3317 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3318 stcb, tp1->whoTo); 3319 3320 /* fix counts and things */ 3321 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3322 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3323 tp1->whoTo->flight_size, 3324 tp1->book_size, 3325 (uintptr_t) stcb, 3326 tp1->rec.data.TSN_seq); 3327 } 3328 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3329 sctp_flight_size_decrease(tp1); 3330 sctp_total_flight_decrease(stcb, tp1); 3331 } 3332 tp1->sent = SCTP_DATAGRAM_RESEND; 3333 } { 3334 /* audit code */ 3335 unsigned int audit; 3336 3337 audit = 0; 3338 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3339 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3340 audit++; 3341 } 3342 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3343 sctp_next) { 3344 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3345 audit++; 3346 } 3347 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3348 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3349 audit, stcb->asoc.sent_queue_retran_cnt); 3350#ifndef SCTP_AUDITING_ENABLED 3351 stcb->asoc.sent_queue_retran_cnt = audit; 3352#endif 3353 } 3354 } 3355 } 3356 break; 3357 case SCTP_ASCONF: 3358 { 3359 struct sctp_tmit_chunk *asconf; 3360 3361 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3362 sctp_next) { 3363 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3364 break; 3365 } 3366 } 3367 if (asconf) { 3368 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3369 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3370 asconf->sent = SCTP_DATAGRAM_RESEND; 3371 asconf->snd_count--; 3372 } 3373 } 3374 break; 3375 case SCTP_INITIATION: 3376 /* resend the INIT */ 3377 stcb->asoc.dropped_special_cnt++; 3378 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3379 /* 3380 * If we can get it in, in a few attempts we do 3381 * this, otherwise we let the timer fire. 3382 */ 3383 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3384 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3385 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3386 } 3387 break; 3388 case SCTP_SELECTIVE_ACK: 3389 case SCTP_NR_SELECTIVE_ACK: 3390 /* resend the sack */ 3391 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3392 break; 3393 case SCTP_HEARTBEAT_REQUEST: 3394 /* resend a demand HB */ 3395 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3396 /* 3397 * Only retransmit if we KNOW we wont destroy the 3398 * tcb 3399 */ 3400 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3401 } 3402 break; 3403 case SCTP_SHUTDOWN: 3404 sctp_send_shutdown(stcb, net); 3405 break; 3406 case SCTP_SHUTDOWN_ACK: 3407 sctp_send_shutdown_ack(stcb, net); 3408 break; 3409 case SCTP_COOKIE_ECHO: 3410 { 3411 struct sctp_tmit_chunk *cookie; 3412 3413 cookie = NULL; 3414 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3415 sctp_next) { 3416 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3417 break; 3418 } 3419 } 3420 if (cookie) { 3421 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3422 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3423 cookie->sent = SCTP_DATAGRAM_RESEND; 3424 sctp_stop_all_cookie_timers(stcb); 3425 } 3426 } 3427 break; 3428 case SCTP_COOKIE_ACK: 3429 sctp_send_cookie_ack(stcb); 3430 break; 3431 case SCTP_ASCONF_ACK: 3432 /* resend last asconf ack */ 3433 sctp_send_asconf_ack(stcb); 3434 break; 3435 case SCTP_FORWARD_CUM_TSN: 3436 send_forward_tsn(stcb, &stcb->asoc); 3437 break; 3438 /* can't do anything with these */ 3439 case SCTP_PACKET_DROPPED: 3440 case SCTP_INITIATION_ACK: /* this should not happen */ 3441 case SCTP_HEARTBEAT_ACK: 3442 case SCTP_ABORT_ASSOCIATION: 3443 case SCTP_OPERATION_ERROR: 3444 case SCTP_SHUTDOWN_COMPLETE: 3445 case SCTP_ECN_ECHO: 3446 case SCTP_ECN_CWR: 3447 default: 3448 break; 3449 } 3450 return (0); 3451} 3452 3453void 3454sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3455{ 3456 int i; 3457 uint16_t temp; 3458 3459 /* 3460 * We set things to 0xffff since this is the last delivered sequence 3461 * and we will be sending in 0 after the reset. 3462 */ 3463 3464 if (number_entries) { 3465 for (i = 0; i < number_entries; i++) { 3466 temp = ntohs(list[i]); 3467 if (temp >= stcb->asoc.streamincnt) { 3468 continue; 3469 } 3470 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3471 } 3472 } else { 3473 list = NULL; 3474 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3475 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3476 } 3477 } 3478 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3479} 3480 3481static void 3482sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3483{ 3484 int i; 3485 3486 if (number_entries == 0) { 3487 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3488 stcb->asoc.strmout[i].next_sequence_sent = 0; 3489 } 3490 } else if (number_entries) { 3491 for (i = 0; i < number_entries; i++) { 3492 uint16_t temp; 3493 3494 temp = ntohs(list[i]); 3495 if (temp >= stcb->asoc.streamoutcnt) { 3496 /* no such stream */ 3497 continue; 3498 } 3499 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3500 } 3501 } 3502 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3503} 3504 3505 3506struct sctp_stream_reset_out_request * 3507sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3508{ 3509 struct sctp_association *asoc; 3510 struct sctp_stream_reset_out_req *req; 3511 struct sctp_stream_reset_out_request *r; 3512 struct sctp_tmit_chunk *chk; 3513 int len, clen; 3514 3515 asoc = &stcb->asoc; 3516 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3517 asoc->stream_reset_outstanding = 0; 3518 return (NULL); 3519 } 3520 if (stcb->asoc.str_reset == NULL) { 3521 asoc->stream_reset_outstanding = 0; 3522 return (NULL); 3523 } 3524 chk = stcb->asoc.str_reset; 3525 if (chk->data == NULL) { 3526 return (NULL); 3527 } 3528 if (bchk) { 3529 /* he wants a copy of the chk pointer */ 3530 *bchk = chk; 3531 } 3532 clen = chk->send_size; 3533 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3534 r = &req->sr_req; 3535 if (ntohl(r->request_seq) == seq) { 3536 /* found it */ 3537 return (r); 3538 } 3539 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3540 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3541 /* move to the next one, there can only be a max of two */ 3542 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3543 if (ntohl(r->request_seq) == seq) { 3544 return (r); 3545 } 3546 } 3547 /* that seq is not here */ 3548 return (NULL); 3549} 3550 3551static void 3552sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3553{ 3554 struct sctp_association *asoc; 3555 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3556 3557 if (stcb->asoc.str_reset == NULL) { 3558 return; 3559 } 3560 asoc = &stcb->asoc; 3561 3562 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3563 TAILQ_REMOVE(&asoc->control_send_queue, 3564 chk, 3565 sctp_next); 3566 if (chk->data) { 3567 sctp_m_freem(chk->data); 3568 chk->data = NULL; 3569 } 3570 asoc->ctrl_queue_cnt--; 3571 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3572 /* sa_ignore NO_NULL_CHK */ 3573 stcb->asoc.str_reset = NULL; 3574} 3575 3576 3577static int 3578sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3579 uint32_t seq, uint32_t action, 3580 struct sctp_stream_reset_response *respin) 3581{ 3582 uint16_t type; 3583 int lparm_len; 3584 struct sctp_association *asoc = &stcb->asoc; 3585 struct sctp_tmit_chunk *chk; 3586 struct sctp_stream_reset_out_request *srparam; 3587 int number_entries; 3588 3589 if (asoc->stream_reset_outstanding == 0) { 3590 /* duplicate */ 3591 return (0); 3592 } 3593 if (seq == stcb->asoc.str_reset_seq_out) { 3594 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3595 if (srparam) { 3596 stcb->asoc.str_reset_seq_out++; 3597 type = ntohs(srparam->ph.param_type); 3598 lparm_len = ntohs(srparam->ph.param_length); 3599 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3600 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3601 asoc->stream_reset_out_is_outstanding = 0; 3602 if (asoc->stream_reset_outstanding) 3603 asoc->stream_reset_outstanding--; 3604 if (action == SCTP_STREAM_RESET_PERFORMED) { 3605 /* do it */ 3606 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3607 } else { 3608 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3609 } 3610 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3611 /* Answered my request */ 3612 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3613 if (asoc->stream_reset_outstanding) 3614 asoc->stream_reset_outstanding--; 3615 if (action != SCTP_STREAM_RESET_PERFORMED) { 3616 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3617 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3618 } 3619 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3620 /* Ok we now may have more streams */ 3621 int num_stream; 3622 3623 num_stream = stcb->asoc.strm_pending_add_size; 3624 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3625 /* TSNH */ 3626 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3627 } 3628 stcb->asoc.strm_pending_add_size = 0; 3629 if (asoc->stream_reset_outstanding) 3630 asoc->stream_reset_outstanding--; 3631 if (action == SCTP_STREAM_RESET_PERFORMED) { 3632 /* Put the new streams into effect */ 3633 stcb->asoc.streamoutcnt += num_stream; 3634 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3635 } else { 3636 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3637 SCTP_STREAM_CHANGED_DENIED); 3638 } 3639 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3640 if (asoc->stream_reset_outstanding) 3641 asoc->stream_reset_outstanding--; 3642 if (action != SCTP_STREAM_RESET_PERFORMED) { 3643 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3644 SCTP_STREAM_CHANGED_DENIED); 3645 } 3646 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3647 /** 3648 * a) Adopt the new in tsn. 3649 * b) reset the map 3650 * c) Adopt the new out-tsn 3651 */ 3652 struct sctp_stream_reset_response_tsn *resp; 3653 struct sctp_forward_tsn_chunk fwdtsn; 3654 int abort_flag = 0; 3655 3656 if (respin == NULL) { 3657 /* huh ? */ 3658 return (0); 3659 } 3660 if (action == SCTP_STREAM_RESET_PERFORMED) { 3661 resp = (struct sctp_stream_reset_response_tsn *)respin; 3662 asoc->stream_reset_outstanding--; 3663 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3664 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3665 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3666 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3667 if (abort_flag) { 3668 return (1); 3669 } 3670 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3671 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3672 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3673 } 3674 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3675 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3676 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3677 3678 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3679 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3680 3681 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3682 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3683 3684 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3685 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3686 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3687 } else { 3688 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3689 SCTP_STREAM_RESET_FAILED); 3690 } 3691 } 3692 /* get rid of the request and get the request flags */ 3693 if (asoc->stream_reset_outstanding == 0) { 3694 sctp_clean_up_stream_reset(stcb); 3695 } 3696 } 3697 } 3698 return (0); 3699} 3700 3701static void 3702sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3703 struct sctp_tmit_chunk *chk, 3704 struct sctp_stream_reset_in_request *req, int trunc) 3705{ 3706 uint32_t seq; 3707 int len, i; 3708 int number_entries; 3709 uint16_t temp; 3710 3711 /* 3712 * peer wants me to send a str-reset to him for my outgoing seq's if 3713 * seq_in is right. 3714 */ 3715 struct sctp_association *asoc = &stcb->asoc; 3716 3717 seq = ntohl(req->request_seq); 3718 if (asoc->str_reset_seq_in == seq) { 3719 if (trunc) { 3720 /* Can't do it, since they exceeded our buffer size */ 3721 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3722 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3723 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3724 len = ntohs(req->ph.param_length); 3725 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3726 for (i = 0; i < number_entries; i++) { 3727 temp = ntohs(req->list_of_streams[i]); 3728 req->list_of_streams[i] = temp; 3729 } 3730 /* move the reset action back one */ 3731 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3732 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3733 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3734 asoc->str_reset_seq_out, 3735 seq, (asoc->sending_seq - 1)); 3736 asoc->stream_reset_out_is_outstanding = 1; 3737 asoc->str_reset = chk; 3738 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3739 stcb->asoc.stream_reset_outstanding++; 3740 } else { 3741 /* Can't do it, since we have sent one out */ 3742 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3743 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3744 } 3745 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3746 asoc->str_reset_seq_in++; 3747 } else if (asoc->str_reset_seq_in - 1 == seq) { 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3749 } else if (asoc->str_reset_seq_in - 2 == seq) { 3750 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3751 } else { 3752 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3753 } 3754} 3755 3756static int 3757sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3758 struct sctp_tmit_chunk *chk, 3759 struct sctp_stream_reset_tsn_request *req) 3760{ 3761 /* reset all in and out and update the tsn */ 3762 /* 3763 * A) reset my str-seq's on in and out. B) Select a receive next, 3764 * and set cum-ack to it. Also process this selected number as a 3765 * fwd-tsn as well. C) set in the response my next sending seq. 3766 */ 3767 struct sctp_forward_tsn_chunk fwdtsn; 3768 struct sctp_association *asoc = &stcb->asoc; 3769 int abort_flag = 0; 3770 uint32_t seq; 3771 3772 seq = ntohl(req->request_seq); 3773 if (asoc->str_reset_seq_in == seq) { 3774 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3775 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3776 fwdtsn.ch.chunk_flags = 0; 3777 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3778 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3779 if (abort_flag) { 3780 return (1); 3781 } 3782 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3783 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3784 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3785 } 3786 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3787 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3788 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3789 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3790 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3791 atomic_add_int(&stcb->asoc.sending_seq, 1); 3792 /* save off historical data for retrans */ 3793 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3794 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3795 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3796 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3797 3798 sctp_add_stream_reset_result_tsn(chk, 3799 ntohl(req->request_seq), 3800 SCTP_STREAM_RESET_PERFORMED, 3801 stcb->asoc.sending_seq, 3802 stcb->asoc.mapping_array_base_tsn); 3803 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3804 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3805 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3806 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3807 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3808 asoc->str_reset_seq_in++; 3809 } else if (asoc->str_reset_seq_in - 1 == seq) { 3810 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3811 stcb->asoc.last_sending_seq[0], 3812 stcb->asoc.last_base_tsnsent[0] 3813 ); 3814 } else if (asoc->str_reset_seq_in - 2 == seq) { 3815 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3816 stcb->asoc.last_sending_seq[1], 3817 stcb->asoc.last_base_tsnsent[1] 3818 ); 3819 } else { 3820 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3821 } 3822 return (0); 3823} 3824 3825static void 3826sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3827 struct sctp_tmit_chunk *chk, 3828 struct sctp_stream_reset_out_request *req, int trunc) 3829{ 3830 uint32_t seq, tsn; 3831 int number_entries, len; 3832 struct sctp_association *asoc = &stcb->asoc; 3833 3834 seq = ntohl(req->request_seq); 3835 3836 /* now if its not a duplicate we process it */ 3837 if (asoc->str_reset_seq_in == seq) { 3838 len = ntohs(req->ph.param_length); 3839 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3840 /* 3841 * the sender is resetting, handle the list issue.. we must 3842 * a) verify if we can do the reset, if so no problem b) If 3843 * we can't do the reset we must copy the request. c) queue 3844 * it, and setup the data in processor to trigger it off 3845 * when needed and dequeue all the queued data. 3846 */ 3847 tsn = ntohl(req->send_reset_at_tsn); 3848 3849 /* move the reset action back one */ 3850 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3851 if (trunc) { 3852 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3853 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3854 /* we can do it now */ 3855 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3856 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3857 } else { 3858 /* 3859 * we must queue it up and thus wait for the TSN's 3860 * to arrive that are at or before tsn 3861 */ 3862 struct sctp_stream_reset_list *liste; 3863 int siz; 3864 3865 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3866 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3867 siz, SCTP_M_STRESET); 3868 if (liste == NULL) { 3869 /* gak out of memory */ 3870 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_REJECT); 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3872 return; 3873 } 3874 liste->tsn = tsn; 3875 liste->number_entries = number_entries; 3876 memcpy(&liste->req, req, 3877 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3878 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3879 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3880 } 3881 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3882 asoc->str_reset_seq_in++; 3883 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3884 /* 3885 * one seq back, just echo back last action since my 3886 * response was lost. 3887 */ 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3890 /* 3891 * two seq back, just echo back last action since my 3892 * response was lost. 3893 */ 3894 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3895 } else { 3896 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3897 } 3898} 3899 3900static void 3901sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3902 struct sctp_stream_reset_add_strm *str_add) 3903{ 3904 /* 3905 * Peer is requesting to add more streams. If its within our 3906 * max-streams we will allow it. 3907 */ 3908 uint32_t num_stream, i; 3909 uint32_t seq; 3910 struct sctp_association *asoc = &stcb->asoc; 3911 struct sctp_queued_to_read *ctl, *nctl; 3912 3913 /* Get the number. */ 3914 seq = ntohl(str_add->request_seq); 3915 num_stream = ntohs(str_add->number_of_streams); 3916 /* Now what would be the new total? */ 3917 if (asoc->str_reset_seq_in == seq) { 3918 num_stream += stcb->asoc.streamincnt; 3919 if ((num_stream > stcb->asoc.max_inbound_streams) || 3920 (num_stream > 0xffff)) { 3921 /* We must reject it they ask for to many */ 3922 denied: 3923 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3924 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 3925 } else { 3926 /* Ok, we can do that :-) */ 3927 struct sctp_stream_in *oldstrm; 3928 3929 /* save off the old */ 3930 oldstrm = stcb->asoc.strmin; 3931 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3932 (num_stream * sizeof(struct sctp_stream_in)), 3933 SCTP_M_STRMI); 3934 if (stcb->asoc.strmin == NULL) { 3935 stcb->asoc.strmin = oldstrm; 3936 goto denied; 3937 } 3938 /* copy off the old data */ 3939 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3940 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3941 stcb->asoc.strmin[i].stream_no = i; 3942 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3943 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3944 /* now anything on those queues? */ 3945 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3946 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3947 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3948 } 3949 } 3950 /* Init the new streams */ 3951 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3952 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3953 stcb->asoc.strmin[i].stream_no = i; 3954 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3955 stcb->asoc.strmin[i].delivery_started = 0; 3956 } 3957 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3958 /* update the size */ 3959 stcb->asoc.streamincnt = num_stream; 3960 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3961 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3962 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3963 } 3964 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3965 asoc->str_reset_seq_in++; 3966 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3967 /* 3968 * one seq back, just echo back last action since my 3969 * response was lost. 3970 */ 3971 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3972 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3973 /* 3974 * two seq back, just echo back last action since my 3975 * response was lost. 3976 */ 3977 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3978 } else { 3979 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3980 3981 } 3982} 3983 3984static void 3985sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3986 struct sctp_stream_reset_add_strm *str_add) 3987{ 3988 /* 3989 * Peer is requesting to add more streams. If its within our 3990 * max-streams we will allow it. 3991 */ 3992 uint16_t num_stream; 3993 uint32_t seq; 3994 struct sctp_association *asoc = &stcb->asoc; 3995 3996 /* Get the number. */ 3997 seq = ntohl(str_add->request_seq); 3998 num_stream = ntohs(str_add->number_of_streams); 3999 /* Now what would be the new total? */ 4000 if (asoc->str_reset_seq_in == seq) { 4001 if (stcb->asoc.stream_reset_outstanding) { 4002 /* We must reject it we have something pending */ 4003 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4004 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4005 } else { 4006 /* Ok, we can do that :-) */ 4007 int mychk; 4008 4009 mychk = stcb->asoc.streamoutcnt; 4010 mychk += num_stream; 4011 if (mychk < 0x10000) { 4012 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 4014 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4015 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4016 } 4017 } else { 4018 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4019 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_REJECT; 4020 } 4021 } 4022 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4023 asoc->str_reset_seq_in++; 4024 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4025 /* 4026 * one seq back, just echo back last action since my 4027 * response was lost. 4028 */ 4029 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4030 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4031 /* 4032 * two seq back, just echo back last action since my 4033 * response was lost. 4034 */ 4035 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4036 } else { 4037 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 4038 } 4039} 4040 4041#ifdef __GNUC__ 4042__attribute__((noinline)) 4043#endif 4044 static int 4045 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4046 struct sctp_stream_reset_out_req *sr_req) 4047{ 4048 int chk_length, param_len, ptype; 4049 struct sctp_paramhdr pstore; 4050 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4051 4052 uint32_t seq = 0; 4053 int num_req = 0; 4054 int trunc = 0; 4055 struct sctp_tmit_chunk *chk; 4056 struct sctp_chunkhdr *ch; 4057 struct sctp_paramhdr *ph; 4058 int ret_code = 0; 4059 int num_param = 0; 4060 4061 /* now it may be a reset or a reset-response */ 4062 chk_length = ntohs(sr_req->ch.chunk_length); 4063 4064 /* setup for adding the response */ 4065 sctp_alloc_a_chunk(stcb, chk); 4066 if (chk == NULL) { 4067 return (ret_code); 4068 } 4069 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4070 chk->rec.chunk_id.can_take_data = 0; 4071 chk->asoc = &stcb->asoc; 4072 chk->no_fr_allowed = 0; 4073 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4074 chk->book_size_scale = 0; 4075 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4076 if (chk->data == NULL) { 4077strres_nochunk: 4078 if (chk->data) { 4079 sctp_m_freem(chk->data); 4080 chk->data = NULL; 4081 } 4082 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4083 return (ret_code); 4084 } 4085 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4086 4087 /* setup chunk parameters */ 4088 chk->sent = SCTP_DATAGRAM_UNSENT; 4089 chk->snd_count = 0; 4090 chk->whoTo = NULL; 4091 4092 ch = mtod(chk->data, struct sctp_chunkhdr *); 4093 ch->chunk_type = SCTP_STREAM_RESET; 4094 ch->chunk_flags = 0; 4095 ch->chunk_length = htons(chk->send_size); 4096 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4097 offset += sizeof(struct sctp_chunkhdr); 4098 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4099 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4100 if (ph == NULL) 4101 break; 4102 param_len = ntohs(ph->param_length); 4103 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4104 /* bad param */ 4105 break; 4106 } 4107 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4108 (uint8_t *) & cstore); 4109 ptype = ntohs(ph->param_type); 4110 num_param++; 4111 if (param_len > (int)sizeof(cstore)) { 4112 trunc = 1; 4113 } else { 4114 trunc = 0; 4115 } 4116 if (num_param > SCTP_MAX_RESET_PARAMS) { 4117 /* hit the max of parameters already sorry.. */ 4118 break; 4119 } 4120 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4121 struct sctp_stream_reset_out_request *req_out; 4122 4123 req_out = (struct sctp_stream_reset_out_request *)ph; 4124 num_req++; 4125 if (stcb->asoc.stream_reset_outstanding) { 4126 seq = ntohl(req_out->response_seq); 4127 if (seq == stcb->asoc.str_reset_seq_out) { 4128 /* implicit ack */ 4129 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 4130 } 4131 } 4132 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4133 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4134 struct sctp_stream_reset_add_strm *str_add; 4135 4136 str_add = (struct sctp_stream_reset_add_strm *)ph; 4137 num_req++; 4138 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4139 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4140 struct sctp_stream_reset_add_strm *str_add; 4141 4142 str_add = (struct sctp_stream_reset_add_strm *)ph; 4143 num_req++; 4144 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4145 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4146 struct sctp_stream_reset_in_request *req_in; 4147 4148 num_req++; 4149 req_in = (struct sctp_stream_reset_in_request *)ph; 4150 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4151 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4152 struct sctp_stream_reset_tsn_request *req_tsn; 4153 4154 num_req++; 4155 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4156 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4157 ret_code = 1; 4158 goto strres_nochunk; 4159 } 4160 /* no more */ 4161 break; 4162 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4163 struct sctp_stream_reset_response *resp; 4164 uint32_t result; 4165 4166 resp = (struct sctp_stream_reset_response *)ph; 4167 seq = ntohl(resp->response_seq); 4168 result = ntohl(resp->result); 4169 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4170 ret_code = 1; 4171 goto strres_nochunk; 4172 } 4173 } else { 4174 break; 4175 } 4176 offset += SCTP_SIZE32(param_len); 4177 chk_length -= SCTP_SIZE32(param_len); 4178 } 4179 if (num_req == 0) { 4180 /* we have no response free the stuff */ 4181 goto strres_nochunk; 4182 } 4183 /* ok we have a chunk to link in */ 4184 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4185 chk, 4186 sctp_next); 4187 stcb->asoc.ctrl_queue_cnt++; 4188 return (ret_code); 4189} 4190 4191/* 4192 * Handle a router or endpoints report of a packet loss, there are two ways 4193 * to handle this, either we get the whole packet and must disect it 4194 * ourselves (possibly with truncation and or corruption) or it is a summary 4195 * from a middle box that did the disectting for us. 4196 */ 4197static void 4198sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4199 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4200{ 4201 uint32_t bottle_bw, on_queue; 4202 uint16_t trunc_len; 4203 unsigned int chlen; 4204 unsigned int at; 4205 struct sctp_chunk_desc desc; 4206 struct sctp_chunkhdr *ch; 4207 4208 chlen = ntohs(cp->ch.chunk_length); 4209 chlen -= sizeof(struct sctp_pktdrop_chunk); 4210 /* XXX possible chlen underflow */ 4211 if (chlen == 0) { 4212 ch = NULL; 4213 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4214 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4215 } else { 4216 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4217 chlen -= sizeof(struct sctphdr); 4218 /* XXX possible chlen underflow */ 4219 memset(&desc, 0, sizeof(desc)); 4220 } 4221 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4222 if (trunc_len > limit) { 4223 trunc_len = limit; 4224 } 4225 /* now the chunks themselves */ 4226 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4227 desc.chunk_type = ch->chunk_type; 4228 /* get amount we need to move */ 4229 at = ntohs(ch->chunk_length); 4230 if (at < sizeof(struct sctp_chunkhdr)) { 4231 /* corrupt chunk, maybe at the end? */ 4232 SCTP_STAT_INCR(sctps_pdrpcrupt); 4233 break; 4234 } 4235 if (trunc_len == 0) { 4236 /* we are supposed to have all of it */ 4237 if (at > chlen) { 4238 /* corrupt skip it */ 4239 SCTP_STAT_INCR(sctps_pdrpcrupt); 4240 break; 4241 } 4242 } else { 4243 /* is there enough of it left ? */ 4244 if (desc.chunk_type == SCTP_DATA) { 4245 if (chlen < (sizeof(struct sctp_data_chunk) + 4246 sizeof(desc.data_bytes))) { 4247 break; 4248 } 4249 } else { 4250 if (chlen < sizeof(struct sctp_chunkhdr)) { 4251 break; 4252 } 4253 } 4254 } 4255 if (desc.chunk_type == SCTP_DATA) { 4256 /* can we get out the tsn? */ 4257 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4258 SCTP_STAT_INCR(sctps_pdrpmbda); 4259 4260 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4261 /* yep */ 4262 struct sctp_data_chunk *dcp; 4263 uint8_t *ddp; 4264 unsigned int iii; 4265 4266 dcp = (struct sctp_data_chunk *)ch; 4267 ddp = (uint8_t *) (dcp + 1); 4268 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4269 desc.data_bytes[iii] = ddp[iii]; 4270 } 4271 desc.tsn_ifany = dcp->dp.tsn; 4272 } else { 4273 /* nope we are done. */ 4274 SCTP_STAT_INCR(sctps_pdrpnedat); 4275 break; 4276 } 4277 } else { 4278 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4279 SCTP_STAT_INCR(sctps_pdrpmbct); 4280 } 4281 4282 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4283 SCTP_STAT_INCR(sctps_pdrppdbrk); 4284 break; 4285 } 4286 if (SCTP_SIZE32(at) > chlen) { 4287 break; 4288 } 4289 chlen -= SCTP_SIZE32(at); 4290 if (chlen < sizeof(struct sctp_chunkhdr)) { 4291 /* done, none left */ 4292 break; 4293 } 4294 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4295 } 4296 /* Now update any rwnd --- possibly */ 4297 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4298 /* From a peer, we get a rwnd report */ 4299 uint32_t a_rwnd; 4300 4301 SCTP_STAT_INCR(sctps_pdrpfehos); 4302 4303 bottle_bw = ntohl(cp->bottle_bw); 4304 on_queue = ntohl(cp->current_onq); 4305 if (bottle_bw && on_queue) { 4306 /* a rwnd report is in here */ 4307 if (bottle_bw > on_queue) 4308 a_rwnd = bottle_bw - on_queue; 4309 else 4310 a_rwnd = 0; 4311 4312 if (a_rwnd == 0) 4313 stcb->asoc.peers_rwnd = 0; 4314 else { 4315 if (a_rwnd > stcb->asoc.total_flight) { 4316 stcb->asoc.peers_rwnd = 4317 a_rwnd - stcb->asoc.total_flight; 4318 } else { 4319 stcb->asoc.peers_rwnd = 0; 4320 } 4321 if (stcb->asoc.peers_rwnd < 4322 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4323 /* SWS sender side engages */ 4324 stcb->asoc.peers_rwnd = 0; 4325 } 4326 } 4327 } 4328 } else { 4329 SCTP_STAT_INCR(sctps_pdrpfmbox); 4330 } 4331 4332 /* now middle boxes in sat networks get a cwnd bump */ 4333 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4334 (stcb->asoc.sat_t3_loss_recovery == 0) && 4335 (stcb->asoc.sat_network)) { 4336 /* 4337 * This is debateable but for sat networks it makes sense 4338 * Note if a T3 timer has went off, we will prohibit any 4339 * changes to cwnd until we exit the t3 loss recovery. 4340 */ 4341 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4342 net, cp, &bottle_bw, &on_queue); 4343 } 4344} 4345 4346/* 4347 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4348 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4349 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4350 * length of the complete packet outputs: - length: modified to remaining 4351 * length after control processing - netp: modified to new sctp_nets after 4352 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4353 * bad packet,...) otherwise return the tcb for this packet 4354 */ 4355#ifdef __GNUC__ 4356__attribute__((noinline)) 4357#endif 4358 static struct sctp_tcb * 4359 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4360 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4361 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4362 uint32_t vrf_id, uint16_t port) 4363{ 4364 struct sctp_association *asoc; 4365 uint32_t vtag_in; 4366 int num_chunks = 0; /* number of control chunks processed */ 4367 uint32_t chk_length; 4368 int ret; 4369 int abort_no_unlock = 0; 4370 int ecne_seen = 0; 4371 4372 /* 4373 * How big should this be, and should it be alloc'd? Lets try the 4374 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4375 * until we get into jumbo grams and such.. 4376 */ 4377 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4378 struct sctp_tcb *locked_tcb = stcb; 4379 int got_auth = 0; 4380 uint32_t auth_offset = 0, auth_len = 0; 4381 int auth_skipped = 0; 4382 int asconf_cnt = 0; 4383 4384#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4385 struct socket *so; 4386 4387#endif 4388 4389 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4390 iphlen, *offset, length, stcb); 4391 4392 /* validate chunk header length... */ 4393 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4394 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4395 ntohs(ch->chunk_length)); 4396 if (locked_tcb) { 4397 SCTP_TCB_UNLOCK(locked_tcb); 4398 } 4399 return (NULL); 4400 } 4401 /* 4402 * validate the verification tag 4403 */ 4404 vtag_in = ntohl(sh->v_tag); 4405 4406 if (locked_tcb) { 4407 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4408 } 4409 if (ch->chunk_type == SCTP_INITIATION) { 4410 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4411 ntohs(ch->chunk_length), vtag_in); 4412 if (vtag_in != 0) { 4413 /* protocol error- silently discard... */ 4414 SCTP_STAT_INCR(sctps_badvtag); 4415 if (locked_tcb) { 4416 SCTP_TCB_UNLOCK(locked_tcb); 4417 } 4418 return (NULL); 4419 } 4420 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4421 /* 4422 * If there is no stcb, skip the AUTH chunk and process 4423 * later after a stcb is found (to validate the lookup was 4424 * valid. 4425 */ 4426 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4427 (stcb == NULL) && 4428 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4429 /* save this chunk for later processing */ 4430 auth_skipped = 1; 4431 auth_offset = *offset; 4432 auth_len = ntohs(ch->chunk_length); 4433 4434 /* (temporarily) move past this chunk */ 4435 *offset += SCTP_SIZE32(auth_len); 4436 if (*offset >= length) { 4437 /* no more data left in the mbuf chain */ 4438 *offset = length; 4439 if (locked_tcb) { 4440 SCTP_TCB_UNLOCK(locked_tcb); 4441 } 4442 return (NULL); 4443 } 4444 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4445 sizeof(struct sctp_chunkhdr), chunk_buf); 4446 } 4447 if (ch == NULL) { 4448 /* Help */ 4449 *offset = length; 4450 if (locked_tcb) { 4451 SCTP_TCB_UNLOCK(locked_tcb); 4452 } 4453 return (NULL); 4454 } 4455 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4456 goto process_control_chunks; 4457 } 4458 /* 4459 * first check if it's an ASCONF with an unknown src addr we 4460 * need to look inside to find the association 4461 */ 4462 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4463 struct sctp_chunkhdr *asconf_ch = ch; 4464 uint32_t asconf_offset = 0, asconf_len = 0; 4465 4466 /* inp's refcount may be reduced */ 4467 SCTP_INP_INCR_REF(inp); 4468 4469 asconf_offset = *offset; 4470 do { 4471 asconf_len = ntohs(asconf_ch->chunk_length); 4472 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4473 break; 4474 stcb = sctp_findassociation_ep_asconf(m, 4475 *offset, sh, &inp, netp, vrf_id); 4476 if (stcb != NULL) 4477 break; 4478 asconf_offset += SCTP_SIZE32(asconf_len); 4479 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4480 sizeof(struct sctp_chunkhdr), chunk_buf); 4481 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4482 if (stcb == NULL) { 4483 /* 4484 * reduce inp's refcount if not reduced in 4485 * sctp_findassociation_ep_asconf(). 4486 */ 4487 SCTP_INP_DECR_REF(inp); 4488 } else { 4489 locked_tcb = stcb; 4490 } 4491 4492 /* now go back and verify any auth chunk to be sure */ 4493 if (auth_skipped && (stcb != NULL)) { 4494 struct sctp_auth_chunk *auth; 4495 4496 auth = (struct sctp_auth_chunk *) 4497 sctp_m_getptr(m, auth_offset, 4498 auth_len, chunk_buf); 4499 got_auth = 1; 4500 auth_skipped = 0; 4501 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4502 auth_offset)) { 4503 /* auth HMAC failed so dump it */ 4504 *offset = length; 4505 if (locked_tcb) { 4506 SCTP_TCB_UNLOCK(locked_tcb); 4507 } 4508 return (NULL); 4509 } else { 4510 /* remaining chunks are HMAC checked */ 4511 stcb->asoc.authenticated = 1; 4512 } 4513 } 4514 } 4515 if (stcb == NULL) { 4516 /* no association, so it's out of the blue... */ 4517 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4518 vrf_id, port); 4519 *offset = length; 4520 if (locked_tcb) { 4521 SCTP_TCB_UNLOCK(locked_tcb); 4522 } 4523 return (NULL); 4524 } 4525 asoc = &stcb->asoc; 4526 /* ABORT and SHUTDOWN can use either v_tag... */ 4527 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4528 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4529 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4530 if ((vtag_in == asoc->my_vtag) || 4531 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4532 (vtag_in == asoc->peer_vtag))) { 4533 /* this is valid */ 4534 } else { 4535 /* drop this packet... */ 4536 SCTP_STAT_INCR(sctps_badvtag); 4537 if (locked_tcb) { 4538 SCTP_TCB_UNLOCK(locked_tcb); 4539 } 4540 return (NULL); 4541 } 4542 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4543 if (vtag_in != asoc->my_vtag) { 4544 /* 4545 * this could be a stale SHUTDOWN-ACK or the 4546 * peer never got the SHUTDOWN-COMPLETE and 4547 * is still hung; we have started a new asoc 4548 * but it won't complete until the shutdown 4549 * is completed 4550 */ 4551 if (locked_tcb) { 4552 SCTP_TCB_UNLOCK(locked_tcb); 4553 } 4554 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4555 NULL, vrf_id, port); 4556 return (NULL); 4557 } 4558 } else { 4559 /* for all other chunks, vtag must match */ 4560 if (vtag_in != asoc->my_vtag) { 4561 /* invalid vtag... */ 4562 SCTPDBG(SCTP_DEBUG_INPUT3, 4563 "invalid vtag: %xh, expect %xh\n", 4564 vtag_in, asoc->my_vtag); 4565 SCTP_STAT_INCR(sctps_badvtag); 4566 if (locked_tcb) { 4567 SCTP_TCB_UNLOCK(locked_tcb); 4568 } 4569 *offset = length; 4570 return (NULL); 4571 } 4572 } 4573 } /* end if !SCTP_COOKIE_ECHO */ 4574 /* 4575 * process all control chunks... 4576 */ 4577 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4578 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4579 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4580 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4581 /* implied cookie-ack.. we must have lost the ack */ 4582 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4583 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4584 stcb->asoc.overall_error_count, 4585 0, 4586 SCTP_FROM_SCTP_INPUT, 4587 __LINE__); 4588 } 4589 stcb->asoc.overall_error_count = 0; 4590 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4591 *netp); 4592 } 4593process_control_chunks: 4594 while (IS_SCTP_CONTROL(ch)) { 4595 /* validate chunk length */ 4596 chk_length = ntohs(ch->chunk_length); 4597 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4598 ch->chunk_type, chk_length); 4599 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4600 if (chk_length < sizeof(*ch) || 4601 (*offset + (int)chk_length) > length) { 4602 *offset = length; 4603 if (locked_tcb) { 4604 SCTP_TCB_UNLOCK(locked_tcb); 4605 } 4606 return (NULL); 4607 } 4608 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4609 /* 4610 * INIT-ACK only gets the init ack "header" portion only 4611 * because we don't have to process the peer's COOKIE. All 4612 * others get a complete chunk. 4613 */ 4614 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4615 (ch->chunk_type == SCTP_INITIATION)) { 4616 /* get an init-ack chunk */ 4617 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4618 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4619 if (ch == NULL) { 4620 *offset = length; 4621 if (locked_tcb) { 4622 SCTP_TCB_UNLOCK(locked_tcb); 4623 } 4624 return (NULL); 4625 } 4626 } else { 4627 /* For cookies and all other chunks. */ 4628 if (chk_length > sizeof(chunk_buf)) { 4629 /* 4630 * use just the size of the chunk buffer so 4631 * the front part of our chunks fit in 4632 * contiguous space up to the chunk buffer 4633 * size (508 bytes). For chunks that need to 4634 * get more than that they must use the 4635 * sctp_m_getptr() function or other means 4636 * (e.g. know how to parse mbuf chains). 4637 * Cookies do this already. 4638 */ 4639 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4640 (sizeof(chunk_buf) - 4), 4641 chunk_buf); 4642 if (ch == NULL) { 4643 *offset = length; 4644 if (locked_tcb) { 4645 SCTP_TCB_UNLOCK(locked_tcb); 4646 } 4647 return (NULL); 4648 } 4649 } else { 4650 /* We can fit it all */ 4651 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4652 chk_length, chunk_buf); 4653 if (ch == NULL) { 4654 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4655 *offset = length; 4656 if (locked_tcb) { 4657 SCTP_TCB_UNLOCK(locked_tcb); 4658 } 4659 return (NULL); 4660 } 4661 } 4662 } 4663 num_chunks++; 4664 /* Save off the last place we got a control from */ 4665 if (stcb != NULL) { 4666 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4667 /* 4668 * allow last_control to be NULL if 4669 * ASCONF... ASCONF processing will find the 4670 * right net later 4671 */ 4672 if ((netp != NULL) && (*netp != NULL)) 4673 stcb->asoc.last_control_chunk_from = *netp; 4674 } 4675 } 4676#ifdef SCTP_AUDITING_ENABLED 4677 sctp_audit_log(0xB0, ch->chunk_type); 4678#endif 4679 4680 /* check to see if this chunk required auth, but isn't */ 4681 if ((stcb != NULL) && 4682 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4683 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4684 !stcb->asoc.authenticated) { 4685 /* "silently" ignore */ 4686 SCTP_STAT_INCR(sctps_recvauthmissing); 4687 goto next_chunk; 4688 } 4689 switch (ch->chunk_type) { 4690 case SCTP_INITIATION: 4691 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4692 /* The INIT chunk must be the only chunk. */ 4693 if ((num_chunks > 1) || 4694 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4695 sctp_abort_association(inp, stcb, m, 4696 iphlen, sh, NULL, vrf_id, port); 4697 *offset = length; 4698 return (NULL); 4699 } 4700 /* Honor our resource limit. */ 4701 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4702 struct mbuf *op_err; 4703 4704 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4705 sctp_abort_association(inp, stcb, m, 4706 iphlen, sh, op_err, vrf_id, port); 4707 *offset = length; 4708 return (NULL); 4709 } 4710 sctp_handle_init(m, iphlen, *offset, sh, 4711 (struct sctp_init_chunk *)ch, inp, 4712 stcb, &abort_no_unlock, vrf_id, port); 4713 *offset = length; 4714 if ((!abort_no_unlock) && (locked_tcb)) { 4715 SCTP_TCB_UNLOCK(locked_tcb); 4716 } 4717 return (NULL); 4718 break; 4719 case SCTP_PAD_CHUNK: 4720 break; 4721 case SCTP_INITIATION_ACK: 4722 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4723 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4724 /* We are not interested anymore */ 4725 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4726 ; 4727 } else { 4728 if (locked_tcb != stcb) { 4729 /* Very unlikely */ 4730 SCTP_TCB_UNLOCK(locked_tcb); 4731 } 4732 *offset = length; 4733 if (stcb) { 4734#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4735 so = SCTP_INP_SO(inp); 4736 atomic_add_int(&stcb->asoc.refcnt, 1); 4737 SCTP_TCB_UNLOCK(stcb); 4738 SCTP_SOCKET_LOCK(so, 1); 4739 SCTP_TCB_LOCK(stcb); 4740 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4741#endif 4742 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4743#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4744 SCTP_SOCKET_UNLOCK(so, 1); 4745#endif 4746 } 4747 return (NULL); 4748 } 4749 } 4750 /* The INIT-ACK chunk must be the only chunk. */ 4751 if ((num_chunks > 1) || 4752 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4753 *offset = length; 4754 if (locked_tcb) { 4755 SCTP_TCB_UNLOCK(locked_tcb); 4756 } 4757 return (NULL); 4758 } 4759 if ((netp) && (*netp)) { 4760 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4761 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4762 } else { 4763 ret = -1; 4764 } 4765 *offset = length; 4766 if (abort_no_unlock) { 4767 return (NULL); 4768 } 4769 /* 4770 * Special case, I must call the output routine to 4771 * get the cookie echoed 4772 */ 4773 if ((stcb != NULL) && (ret == 0)) { 4774 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4775 } 4776 if (locked_tcb) { 4777 SCTP_TCB_UNLOCK(locked_tcb); 4778 } 4779 return (NULL); 4780 break; 4781 case SCTP_SELECTIVE_ACK: 4782 { 4783 struct sctp_sack_chunk *sack; 4784 int abort_now = 0; 4785 uint32_t a_rwnd, cum_ack; 4786 uint16_t num_seg, num_dup; 4787 uint8_t flags; 4788 int offset_seg, offset_dup; 4789 4790 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4791 SCTP_STAT_INCR(sctps_recvsacks); 4792 if (stcb == NULL) { 4793 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4794 break; 4795 } 4796 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4797 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4798 break; 4799 } 4800 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4801 /*- 4802 * If we have sent a shutdown-ack, we will pay no 4803 * attention to a sack sent in to us since 4804 * we don't care anymore. 4805 */ 4806 break; 4807 } 4808 sack = (struct sctp_sack_chunk *)ch; 4809 flags = ch->chunk_flags; 4810 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4811 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4812 num_dup = ntohs(sack->sack.num_dup_tsns); 4813 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4814 if (sizeof(struct sctp_sack_chunk) + 4815 num_seg * sizeof(struct sctp_gap_ack_block) + 4816 num_dup * sizeof(uint32_t) != chk_length) { 4817 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4818 break; 4819 } 4820 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4821 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4822 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4823 cum_ack, num_seg, a_rwnd); 4824 stcb->asoc.seen_a_sack_this_pkt = 1; 4825 if ((stcb->asoc.pr_sctp_cnt == 0) && 4826 (num_seg == 0) && 4827 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4828 (stcb->asoc.saw_sack_with_frags == 0) && 4829 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4830 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4831 ) { 4832 /* 4833 * We have a SIMPLE sack having no 4834 * prior segments and data on sent 4835 * queue to be acked.. Use the 4836 * faster path sack processing. We 4837 * also allow window update sacks 4838 * with no missing segments to go 4839 * this way too. 4840 */ 4841 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4842 } else { 4843 if (netp && *netp) 4844 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4845 num_seg, 0, num_dup, &abort_now, flags, 4846 cum_ack, a_rwnd, ecne_seen); 4847 } 4848 if (abort_now) { 4849 /* ABORT signal from sack processing */ 4850 *offset = length; 4851 return (NULL); 4852 } 4853 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4854 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4855 (stcb->asoc.stream_queue_cnt == 0)) { 4856 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4857 } 4858 } 4859 break; 4860 /* 4861 * EY - nr_sack: If the received chunk is an 4862 * nr_sack chunk 4863 */ 4864 case SCTP_NR_SELECTIVE_ACK: 4865 { 4866 struct sctp_nr_sack_chunk *nr_sack; 4867 int abort_now = 0; 4868 uint32_t a_rwnd, cum_ack; 4869 uint16_t num_seg, num_nr_seg, num_dup; 4870 uint8_t flags; 4871 int offset_seg, offset_dup; 4872 4873 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4874 SCTP_STAT_INCR(sctps_recvsacks); 4875 if (stcb == NULL) { 4876 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4877 break; 4878 } 4879 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4880 (stcb->asoc.peer_supports_nr_sack == 0)) { 4881 goto unknown_chunk; 4882 } 4883 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4884 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4885 break; 4886 } 4887 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4888 /*- 4889 * If we have sent a shutdown-ack, we will pay no 4890 * attention to a sack sent in to us since 4891 * we don't care anymore. 4892 */ 4893 break; 4894 } 4895 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4896 flags = ch->chunk_flags; 4897 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4898 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4899 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4900 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4901 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4902 if (sizeof(struct sctp_nr_sack_chunk) + 4903 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4904 num_dup * sizeof(uint32_t) != chk_length) { 4905 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4906 break; 4907 } 4908 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4909 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4910 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4911 cum_ack, num_seg, a_rwnd); 4912 stcb->asoc.seen_a_sack_this_pkt = 1; 4913 if ((stcb->asoc.pr_sctp_cnt == 0) && 4914 (num_seg == 0) && (num_nr_seg == 0) && 4915 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4916 (stcb->asoc.saw_sack_with_frags == 0) && 4917 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4918 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4919 /* 4920 * We have a SIMPLE sack having no 4921 * prior segments and data on sent 4922 * queue to be acked. Use the faster 4923 * path sack processing. We also 4924 * allow window update sacks with no 4925 * missing segments to go this way 4926 * too. 4927 */ 4928 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4929 &abort_now, ecne_seen); 4930 } else { 4931 if (netp && *netp) 4932 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4933 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4934 cum_ack, a_rwnd, ecne_seen); 4935 } 4936 if (abort_now) { 4937 /* ABORT signal from sack processing */ 4938 *offset = length; 4939 return (NULL); 4940 } 4941 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4942 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4943 (stcb->asoc.stream_queue_cnt == 0)) { 4944 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4945 } 4946 } 4947 break; 4948 4949 case SCTP_HEARTBEAT_REQUEST: 4950 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4951 if ((stcb) && netp && *netp) { 4952 SCTP_STAT_INCR(sctps_recvheartbeat); 4953 sctp_send_heartbeat_ack(stcb, m, *offset, 4954 chk_length, *netp); 4955 4956 /* He's alive so give him credit */ 4957 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4958 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4959 stcb->asoc.overall_error_count, 4960 0, 4961 SCTP_FROM_SCTP_INPUT, 4962 __LINE__); 4963 } 4964 stcb->asoc.overall_error_count = 0; 4965 } 4966 break; 4967 case SCTP_HEARTBEAT_ACK: 4968 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4969 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4970 /* Its not ours */ 4971 *offset = length; 4972 if (locked_tcb) { 4973 SCTP_TCB_UNLOCK(locked_tcb); 4974 } 4975 return (NULL); 4976 } 4977 /* He's alive so give him credit */ 4978 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4979 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4980 stcb->asoc.overall_error_count, 4981 0, 4982 SCTP_FROM_SCTP_INPUT, 4983 __LINE__); 4984 } 4985 stcb->asoc.overall_error_count = 0; 4986 SCTP_STAT_INCR(sctps_recvheartbeatack); 4987 if (netp && *netp) 4988 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4989 stcb, *netp); 4990 break; 4991 case SCTP_ABORT_ASSOCIATION: 4992 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4993 stcb); 4994 if ((stcb) && netp && *netp) 4995 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4996 stcb, *netp); 4997 *offset = length; 4998 return (NULL); 4999 break; 5000 case SCTP_SHUTDOWN: 5001 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5002 stcb); 5003 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5004 *offset = length; 5005 if (locked_tcb) { 5006 SCTP_TCB_UNLOCK(locked_tcb); 5007 } 5008 return (NULL); 5009 } 5010 if (netp && *netp) { 5011 int abort_flag = 0; 5012 5013 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5014 stcb, *netp, &abort_flag); 5015 if (abort_flag) { 5016 *offset = length; 5017 return (NULL); 5018 } 5019 } 5020 break; 5021 case SCTP_SHUTDOWN_ACK: 5022 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 5023 if ((stcb) && (netp) && (*netp)) 5024 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5025 *offset = length; 5026 return (NULL); 5027 break; 5028 5029 case SCTP_OPERATION_ERROR: 5030 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5031 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5032 *offset = length; 5033 return (NULL); 5034 } 5035 break; 5036 case SCTP_COOKIE_ECHO: 5037 SCTPDBG(SCTP_DEBUG_INPUT3, 5038 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 5039 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5040 ; 5041 } else { 5042 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5043 /* We are not interested anymore */ 5044 abend: 5045 if (stcb) { 5046 SCTP_TCB_UNLOCK(stcb); 5047 } 5048 *offset = length; 5049 return (NULL); 5050 } 5051 } 5052 /* 5053 * First are we accepting? We do this again here 5054 * since it is possible that a previous endpoint WAS 5055 * listening responded to a INIT-ACK and then 5056 * closed. We opened and bound.. and are now no 5057 * longer listening. 5058 */ 5059 5060 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5061 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5062 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5063 struct mbuf *op_err; 5064 5065 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5066 sctp_abort_association(inp, stcb, m, 5067 iphlen, sh, op_err, vrf_id, port); 5068 } 5069 *offset = length; 5070 return (NULL); 5071 } else { 5072 struct mbuf *ret_buf; 5073 struct sctp_inpcb *linp; 5074 5075 if (stcb) { 5076 linp = NULL; 5077 } else { 5078 linp = inp; 5079 } 5080 5081 if (linp) { 5082 SCTP_ASOC_CREATE_LOCK(linp); 5083 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5084 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5085 SCTP_ASOC_CREATE_UNLOCK(linp); 5086 goto abend; 5087 } 5088 } 5089 if (netp) { 5090 ret_buf = 5091 sctp_handle_cookie_echo(m, iphlen, 5092 *offset, sh, 5093 (struct sctp_cookie_echo_chunk *)ch, 5094 &inp, &stcb, netp, 5095 auth_skipped, 5096 auth_offset, 5097 auth_len, 5098 &locked_tcb, 5099 vrf_id, 5100 port); 5101 } else { 5102 ret_buf = NULL; 5103 } 5104 if (linp) { 5105 SCTP_ASOC_CREATE_UNLOCK(linp); 5106 } 5107 if (ret_buf == NULL) { 5108 if (locked_tcb) { 5109 SCTP_TCB_UNLOCK(locked_tcb); 5110 } 5111 SCTPDBG(SCTP_DEBUG_INPUT3, 5112 "GAK, null buffer\n"); 5113 *offset = length; 5114 return (NULL); 5115 } 5116 /* if AUTH skipped, see if it verified... */ 5117 if (auth_skipped) { 5118 got_auth = 1; 5119 auth_skipped = 0; 5120 } 5121 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5122 /* 5123 * Restart the timer if we have 5124 * pending data 5125 */ 5126 struct sctp_tmit_chunk *chk; 5127 5128 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5129 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5130 } 5131 } 5132 break; 5133 case SCTP_COOKIE_ACK: 5134 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 5135 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5136 if (locked_tcb) { 5137 SCTP_TCB_UNLOCK(locked_tcb); 5138 } 5139 return (NULL); 5140 } 5141 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5142 /* We are not interested anymore */ 5143 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5144 ; 5145 } else if (stcb) { 5146#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5147 so = SCTP_INP_SO(inp); 5148 atomic_add_int(&stcb->asoc.refcnt, 1); 5149 SCTP_TCB_UNLOCK(stcb); 5150 SCTP_SOCKET_LOCK(so, 1); 5151 SCTP_TCB_LOCK(stcb); 5152 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5153#endif 5154 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5155#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5156 SCTP_SOCKET_UNLOCK(so, 1); 5157#endif 5158 *offset = length; 5159 return (NULL); 5160 } 5161 } 5162 /* He's alive so give him credit */ 5163 if ((stcb) && netp && *netp) { 5164 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5165 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5166 stcb->asoc.overall_error_count, 5167 0, 5168 SCTP_FROM_SCTP_INPUT, 5169 __LINE__); 5170 } 5171 stcb->asoc.overall_error_count = 0; 5172 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5173 } 5174 break; 5175 case SCTP_ECN_ECHO: 5176 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5177 /* He's alive so give him credit */ 5178 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5179 /* Its not ours */ 5180 if (locked_tcb) { 5181 SCTP_TCB_UNLOCK(locked_tcb); 5182 } 5183 *offset = length; 5184 return (NULL); 5185 } 5186 if (stcb) { 5187 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5188 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5189 stcb->asoc.overall_error_count, 5190 0, 5191 SCTP_FROM_SCTP_INPUT, 5192 __LINE__); 5193 } 5194 stcb->asoc.overall_error_count = 0; 5195 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5196 stcb); 5197 ecne_seen = 1; 5198 } 5199 break; 5200 case SCTP_ECN_CWR: 5201 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5202 /* He's alive so give him credit */ 5203 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5204 /* Its not ours */ 5205 if (locked_tcb) { 5206 SCTP_TCB_UNLOCK(locked_tcb); 5207 } 5208 *offset = length; 5209 return (NULL); 5210 } 5211 if (stcb) { 5212 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5213 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5214 stcb->asoc.overall_error_count, 5215 0, 5216 SCTP_FROM_SCTP_INPUT, 5217 __LINE__); 5218 } 5219 stcb->asoc.overall_error_count = 0; 5220 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5221 } 5222 break; 5223 case SCTP_SHUTDOWN_COMPLETE: 5224 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 5225 /* must be first and only chunk */ 5226 if ((num_chunks > 1) || 5227 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5228 *offset = length; 5229 if (locked_tcb) { 5230 SCTP_TCB_UNLOCK(locked_tcb); 5231 } 5232 return (NULL); 5233 } 5234 if ((stcb) && netp && *netp) { 5235 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5236 stcb, *netp); 5237 } 5238 *offset = length; 5239 return (NULL); 5240 break; 5241 case SCTP_ASCONF: 5242 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5243 /* He's alive so give him credit */ 5244 if (stcb) { 5245 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5246 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5247 stcb->asoc.overall_error_count, 5248 0, 5249 SCTP_FROM_SCTP_INPUT, 5250 __LINE__); 5251 } 5252 stcb->asoc.overall_error_count = 0; 5253 sctp_handle_asconf(m, *offset, 5254 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5255 asconf_cnt++; 5256 } 5257 break; 5258 case SCTP_ASCONF_ACK: 5259 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5260 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5261 /* Its not ours */ 5262 if (locked_tcb) { 5263 SCTP_TCB_UNLOCK(locked_tcb); 5264 } 5265 *offset = length; 5266 return (NULL); 5267 } 5268 if ((stcb) && netp && *netp) { 5269 /* He's alive so give him credit */ 5270 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5271 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5272 stcb->asoc.overall_error_count, 5273 0, 5274 SCTP_FROM_SCTP_INPUT, 5275 __LINE__); 5276 } 5277 stcb->asoc.overall_error_count = 0; 5278 sctp_handle_asconf_ack(m, *offset, 5279 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5280 if (abort_no_unlock) 5281 return (NULL); 5282 } 5283 break; 5284 case SCTP_FORWARD_CUM_TSN: 5285 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5286 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5287 /* Its not ours */ 5288 if (locked_tcb) { 5289 SCTP_TCB_UNLOCK(locked_tcb); 5290 } 5291 *offset = length; 5292 return (NULL); 5293 } 5294 /* He's alive so give him credit */ 5295 if (stcb) { 5296 int abort_flag = 0; 5297 5298 stcb->asoc.overall_error_count = 0; 5299 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5300 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5301 stcb->asoc.overall_error_count, 5302 0, 5303 SCTP_FROM_SCTP_INPUT, 5304 __LINE__); 5305 } 5306 *fwd_tsn_seen = 1; 5307 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5308 /* We are not interested anymore */ 5309#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5310 so = SCTP_INP_SO(inp); 5311 atomic_add_int(&stcb->asoc.refcnt, 1); 5312 SCTP_TCB_UNLOCK(stcb); 5313 SCTP_SOCKET_LOCK(so, 1); 5314 SCTP_TCB_LOCK(stcb); 5315 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5316#endif 5317 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5318#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5319 SCTP_SOCKET_UNLOCK(so, 1); 5320#endif 5321 *offset = length; 5322 return (NULL); 5323 } 5324 sctp_handle_forward_tsn(stcb, 5325 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5326 if (abort_flag) { 5327 *offset = length; 5328 return (NULL); 5329 } else { 5330 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5331 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5332 stcb->asoc.overall_error_count, 5333 0, 5334 SCTP_FROM_SCTP_INPUT, 5335 __LINE__); 5336 } 5337 stcb->asoc.overall_error_count = 0; 5338 } 5339 5340 } 5341 break; 5342 case SCTP_STREAM_RESET: 5343 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5344 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5345 /* Its not ours */ 5346 if (locked_tcb) { 5347 SCTP_TCB_UNLOCK(locked_tcb); 5348 } 5349 *offset = length; 5350 return (NULL); 5351 } 5352 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5353 /* We are not interested anymore */ 5354#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5355 so = SCTP_INP_SO(inp); 5356 atomic_add_int(&stcb->asoc.refcnt, 1); 5357 SCTP_TCB_UNLOCK(stcb); 5358 SCTP_SOCKET_LOCK(so, 1); 5359 SCTP_TCB_LOCK(stcb); 5360 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5361#endif 5362 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5363#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5364 SCTP_SOCKET_UNLOCK(so, 1); 5365#endif 5366 *offset = length; 5367 return (NULL); 5368 } 5369 if (stcb->asoc.peer_supports_strreset == 0) { 5370 /* 5371 * hmm, peer should have announced this, but 5372 * we will turn it on since he is sending us 5373 * a stream reset. 5374 */ 5375 stcb->asoc.peer_supports_strreset = 1; 5376 } 5377 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5378 /* stop processing */ 5379 *offset = length; 5380 return (NULL); 5381 } 5382 break; 5383 case SCTP_PACKET_DROPPED: 5384 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5385 /* re-get it all please */ 5386 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5387 /* Its not ours */ 5388 if (locked_tcb) { 5389 SCTP_TCB_UNLOCK(locked_tcb); 5390 } 5391 *offset = length; 5392 return (NULL); 5393 } 5394 if (ch && (stcb) && netp && (*netp)) { 5395 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5396 stcb, *netp, 5397 min(chk_length, (sizeof(chunk_buf) - 4))); 5398 5399 } 5400 break; 5401 5402 case SCTP_AUTHENTICATION: 5403 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5404 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5405 goto unknown_chunk; 5406 5407 if (stcb == NULL) { 5408 /* save the first AUTH for later processing */ 5409 if (auth_skipped == 0) { 5410 auth_offset = *offset; 5411 auth_len = chk_length; 5412 auth_skipped = 1; 5413 } 5414 /* skip this chunk (temporarily) */ 5415 goto next_chunk; 5416 } 5417 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5418 (chk_length > (sizeof(struct sctp_auth_chunk) + 5419 SCTP_AUTH_DIGEST_LEN_MAX))) { 5420 /* Its not ours */ 5421 if (locked_tcb) { 5422 SCTP_TCB_UNLOCK(locked_tcb); 5423 } 5424 *offset = length; 5425 return (NULL); 5426 } 5427 if (got_auth == 1) { 5428 /* skip this chunk... it's already auth'd */ 5429 goto next_chunk; 5430 } 5431 got_auth = 1; 5432 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5433 m, *offset)) { 5434 /* auth HMAC failed so dump the packet */ 5435 *offset = length; 5436 return (stcb); 5437 } else { 5438 /* remaining chunks are HMAC checked */ 5439 stcb->asoc.authenticated = 1; 5440 } 5441 break; 5442 5443 default: 5444 unknown_chunk: 5445 /* it's an unknown chunk! */ 5446 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5447 struct mbuf *mm; 5448 struct sctp_paramhdr *phd; 5449 5450 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5451 0, M_DONTWAIT, 1, MT_DATA); 5452 if (mm) { 5453 phd = mtod(mm, struct sctp_paramhdr *); 5454 /* 5455 * We cheat and use param type since 5456 * we did not bother to define a 5457 * error cause struct. They are the 5458 * same basic format with different 5459 * names. 5460 */ 5461 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5462 phd->param_length = htons(chk_length + sizeof(*phd)); 5463 SCTP_BUF_LEN(mm) = sizeof(*phd); 5464 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5465 M_DONTWAIT); 5466 if (SCTP_BUF_NEXT(mm)) { 5467#ifdef SCTP_MBUF_LOGGING 5468 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5469 struct mbuf *mat; 5470 5471 mat = SCTP_BUF_NEXT(mm); 5472 while (mat) { 5473 if (SCTP_BUF_IS_EXTENDED(mat)) { 5474 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5475 } 5476 mat = SCTP_BUF_NEXT(mat); 5477 } 5478 } 5479#endif 5480 sctp_queue_op_err(stcb, mm); 5481 } else { 5482 sctp_m_freem(mm); 5483 } 5484 } 5485 } 5486 if ((ch->chunk_type & 0x80) == 0) { 5487 /* discard this packet */ 5488 *offset = length; 5489 return (stcb); 5490 } /* else skip this bad chunk and continue... */ 5491 break; 5492 } /* switch (ch->chunk_type) */ 5493 5494 5495next_chunk: 5496 /* get the next chunk */ 5497 *offset += SCTP_SIZE32(chk_length); 5498 if (*offset >= length) { 5499 /* no more data left in the mbuf chain */ 5500 break; 5501 } 5502 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5503 sizeof(struct sctp_chunkhdr), chunk_buf); 5504 if (ch == NULL) { 5505 if (locked_tcb) { 5506 SCTP_TCB_UNLOCK(locked_tcb); 5507 } 5508 *offset = length; 5509 return (NULL); 5510 } 5511 } /* while */ 5512 5513 if (asconf_cnt > 0 && stcb != NULL) { 5514 sctp_send_asconf_ack(stcb); 5515 } 5516 return (stcb); 5517} 5518 5519 5520#ifdef INVARIANTS 5521#ifdef __GNUC__ 5522__attribute__((noinline)) 5523#endif 5524 void 5525 sctp_validate_no_locks(struct sctp_inpcb *inp) 5526{ 5527 struct sctp_tcb *lstcb; 5528 5529 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5530 if (mtx_owned(&lstcb->tcb_mtx)) { 5531 panic("Own lock on stcb at return from input"); 5532 } 5533 } 5534 if (mtx_owned(&inp->inp_create_mtx)) { 5535 panic("Own create lock on inp"); 5536 } 5537 if (mtx_owned(&inp->inp_mtx)) { 5538 panic("Own inp lock on inp"); 5539 } 5540} 5541 5542#endif 5543 5544/* 5545 * common input chunk processing (v4 and v6) 5546 */ 5547void 5548sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5549 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5550 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5551 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5552{ 5553 /* 5554 * Control chunk processing 5555 */ 5556 uint32_t high_tsn; 5557 int fwd_tsn_seen = 0, data_processed = 0; 5558 struct mbuf *m = *mm; 5559 int un_sent; 5560 int cnt_ctrl_ready = 0; 5561 5562 SCTP_STAT_INCR(sctps_recvdatagrams); 5563#ifdef SCTP_AUDITING_ENABLED 5564 sctp_audit_log(0xE0, 1); 5565 sctp_auditing(0, inp, stcb, net); 5566#endif 5567 5568 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5569 m, iphlen, offset, length, stcb); 5570 if (stcb) { 5571 /* always clear this before beginning a packet */ 5572 stcb->asoc.authenticated = 0; 5573 stcb->asoc.seen_a_sack_this_pkt = 0; 5574 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5575 stcb, stcb->asoc.state); 5576 5577 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5578 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5579 /*- 5580 * If we hit here, we had a ref count 5581 * up when the assoc was aborted and the 5582 * timer is clearing out the assoc, we should 5583 * NOT respond to any packet.. its OOTB. 5584 */ 5585 SCTP_TCB_UNLOCK(stcb); 5586 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5587 vrf_id, port); 5588 goto out_now; 5589 } 5590 } 5591 if (IS_SCTP_CONTROL(ch)) { 5592 /* process the control portion of the SCTP packet */ 5593 /* sa_ignore NO_NULL_CHK */ 5594 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5595 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5596 if (stcb) { 5597 /* 5598 * This covers us if the cookie-echo was there and 5599 * it changes our INP. 5600 */ 5601 inp = stcb->sctp_ep; 5602 if ((net) && (port)) { 5603 if (net->port == 0) { 5604 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5605 } 5606 net->port = port; 5607 } 5608 } 5609 } else { 5610 /* 5611 * no control chunks, so pre-process DATA chunks (these 5612 * checks are taken care of by control processing) 5613 */ 5614 5615 /* 5616 * if DATA only packet, and auth is required, then punt... 5617 * can't have authenticated without any AUTH (control) 5618 * chunks 5619 */ 5620 if ((stcb != NULL) && 5621 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5622 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5623 /* "silently" ignore */ 5624 SCTP_STAT_INCR(sctps_recvauthmissing); 5625 SCTP_TCB_UNLOCK(stcb); 5626 goto out_now; 5627 } 5628 if (stcb == NULL) { 5629 /* out of the blue DATA chunk */ 5630 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5631 vrf_id, port); 5632 goto out_now; 5633 } 5634 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5635 /* v_tag mismatch! */ 5636 SCTP_STAT_INCR(sctps_badvtag); 5637 SCTP_TCB_UNLOCK(stcb); 5638 goto out_now; 5639 } 5640 } 5641 5642 if (stcb == NULL) { 5643 /* 5644 * no valid TCB for this packet, or we found it's a bad 5645 * packet while processing control, or we're done with this 5646 * packet (done or skip rest of data), so we drop it... 5647 */ 5648 goto out_now; 5649 } 5650 /* 5651 * DATA chunk processing 5652 */ 5653 /* plow through the data chunks while length > offset */ 5654 5655 /* 5656 * Rest should be DATA only. Check authentication state if AUTH for 5657 * DATA is required. 5658 */ 5659 if ((length > offset) && 5660 (stcb != NULL) && 5661 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5662 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5663 !stcb->asoc.authenticated) { 5664 /* "silently" ignore */ 5665 SCTP_STAT_INCR(sctps_recvauthmissing); 5666 SCTPDBG(SCTP_DEBUG_AUTH1, 5667 "Data chunk requires AUTH, skipped\n"); 5668 goto trigger_send; 5669 } 5670 if (length > offset) { 5671 int retval; 5672 5673 /* 5674 * First check to make sure our state is correct. We would 5675 * not get here unless we really did have a tag, so we don't 5676 * abort if this happens, just dump the chunk silently. 5677 */ 5678 switch (SCTP_GET_STATE(&stcb->asoc)) { 5679 case SCTP_STATE_COOKIE_ECHOED: 5680 /* 5681 * we consider data with valid tags in this state 5682 * shows us the cookie-ack was lost. Imply it was 5683 * there. 5684 */ 5685 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5686 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5687 stcb->asoc.overall_error_count, 5688 0, 5689 SCTP_FROM_SCTP_INPUT, 5690 __LINE__); 5691 } 5692 stcb->asoc.overall_error_count = 0; 5693 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5694 break; 5695 case SCTP_STATE_COOKIE_WAIT: 5696 /* 5697 * We consider OOTB any data sent during asoc setup. 5698 */ 5699 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5700 vrf_id, port); 5701 SCTP_TCB_UNLOCK(stcb); 5702 goto out_now; 5703 /* sa_ignore NOTREACHED */ 5704 break; 5705 case SCTP_STATE_EMPTY: /* should not happen */ 5706 case SCTP_STATE_INUSE: /* should not happen */ 5707 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5708 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5709 default: 5710 SCTP_TCB_UNLOCK(stcb); 5711 goto out_now; 5712 /* sa_ignore NOTREACHED */ 5713 break; 5714 case SCTP_STATE_OPEN: 5715 case SCTP_STATE_SHUTDOWN_SENT: 5716 break; 5717 } 5718 /* plow through the data chunks while length > offset */ 5719 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5720 inp, stcb, net, &high_tsn); 5721 if (retval == 2) { 5722 /* 5723 * The association aborted, NO UNLOCK needed since 5724 * the association is destroyed. 5725 */ 5726 goto out_now; 5727 } 5728 data_processed = 1; 5729 /* 5730 * Anything important needs to have been m_copy'ed in 5731 * process_data 5732 */ 5733 } 5734 /* take care of ecn */ 5735 if ((data_processed == 1) && 5736 (stcb->asoc.ecn_allowed == 1) && 5737 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5738 /* Yep, we need to add a ECNE */ 5739 sctp_send_ecn_echo(stcb, net, high_tsn); 5740 } 5741 if ((data_processed == 0) && (fwd_tsn_seen)) { 5742 int was_a_gap; 5743 uint32_t highest_tsn; 5744 5745 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5746 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5747 } else { 5748 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5749 } 5750 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5751 stcb->asoc.send_sack = 1; 5752 sctp_sack_check(stcb, was_a_gap); 5753 } else if (fwd_tsn_seen) { 5754 stcb->asoc.send_sack = 1; 5755 } 5756 /* trigger send of any chunks in queue... */ 5757trigger_send: 5758#ifdef SCTP_AUDITING_ENABLED 5759 sctp_audit_log(0xE0, 2); 5760 sctp_auditing(1, inp, stcb, net); 5761#endif 5762 SCTPDBG(SCTP_DEBUG_INPUT1, 5763 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5764 stcb->asoc.peers_rwnd, 5765 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5766 stcb->asoc.total_flight); 5767 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5768 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5769 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5770 } 5771 if (cnt_ctrl_ready || 5772 ((un_sent) && 5773 (stcb->asoc.peers_rwnd > 0 || 5774 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5775 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5776 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5777 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5778 } 5779#ifdef SCTP_AUDITING_ENABLED 5780 sctp_audit_log(0xE0, 3); 5781 sctp_auditing(2, inp, stcb, net); 5782#endif 5783 SCTP_TCB_UNLOCK(stcb); 5784out_now: 5785#ifdef INVARIANTS 5786 sctp_validate_no_locks(inp); 5787#endif 5788 return; 5789} 5790 5791#if 0 5792static void 5793sctp_print_mbuf_chain(struct mbuf *m) 5794{ 5795 for (; m; m = SCTP_BUF_NEXT(m)) { 5796 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5797 if (SCTP_BUF_IS_EXTENDED(m)) 5798 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5799 } 5800} 5801 5802#endif 5803 5804#ifdef INET 5805void 5806sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5807{ 5808#ifdef SCTP_MBUF_LOGGING 5809 struct mbuf *mat; 5810 5811#endif 5812 struct mbuf *m; 5813 int iphlen; 5814 uint32_t vrf_id = 0; 5815 uint8_t ecn_bits; 5816 struct ip *ip; 5817 struct sctphdr *sh; 5818 struct sctp_inpcb *inp = NULL; 5819 struct sctp_nets *net; 5820 struct sctp_tcb *stcb = NULL; 5821 struct sctp_chunkhdr *ch; 5822 int refcount_up = 0; 5823 int length, mlen, offset; 5824 5825#if !defined(SCTP_WITH_NO_CSUM) 5826 uint32_t check, calc_check; 5827 5828#endif 5829 5830 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5831 SCTP_RELEASE_PKT(i_pak); 5832 return; 5833 } 5834 mlen = SCTP_HEADER_LEN(i_pak); 5835 iphlen = off; 5836 m = SCTP_HEADER_TO_CHAIN(i_pak); 5837 5838 net = NULL; 5839 SCTP_STAT_INCR(sctps_recvpackets); 5840 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5841 5842 5843#ifdef SCTP_MBUF_LOGGING 5844 /* Log in any input mbufs */ 5845 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5846 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 5847 if (SCTP_BUF_IS_EXTENDED(mat)) { 5848 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5849 } 5850 } 5851 } 5852#endif 5853#ifdef SCTP_PACKET_LOGGING 5854 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5855 sctp_packet_log(m, mlen); 5856#endif 5857 /* 5858 * Must take out the iphlen, since mlen expects this (only effect lb 5859 * case) 5860 */ 5861 mlen -= iphlen; 5862 5863 /* 5864 * Get IP, SCTP, and first chunk header together in first mbuf. 5865 */ 5866 ip = mtod(m, struct ip *); 5867 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5868 if (SCTP_BUF_LEN(m) < offset) { 5869 if ((m = m_pullup(m, offset)) == 0) { 5870 SCTP_STAT_INCR(sctps_hdrops); 5871 return; 5872 } 5873 ip = mtod(m, struct ip *); 5874 } 5875 /* validate mbuf chain length with IP payload length */ 5876 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5877 SCTP_STAT_INCR(sctps_hdrops); 5878 goto bad; 5879 } 5880 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5881 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5882 SCTPDBG(SCTP_DEBUG_INPUT1, 5883 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5884 5885 /* SCTP does not allow broadcasts or multicasts */ 5886 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5887 goto bad; 5888 } 5889 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5890 /* 5891 * We only look at broadcast if its a front state, All 5892 * others we will not have a tcb for anyway. 5893 */ 5894 goto bad; 5895 } 5896 /* validate SCTP checksum */ 5897 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5898 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5899 m->m_pkthdr.len, 5900 if_name(m->m_pkthdr.rcvif), 5901 m->m_pkthdr.csum_flags); 5902#if defined(SCTP_WITH_NO_CSUM) 5903 SCTP_STAT_INCR(sctps_recvnocrc); 5904#else 5905 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5906 SCTP_STAT_INCR(sctps_recvhwcrc); 5907 goto sctp_skip_csum_4; 5908 } 5909 check = sh->checksum; /* save incoming checksum */ 5910 sh->checksum = 0; /* prepare for calc */ 5911 calc_check = sctp_calculate_cksum(m, iphlen); 5912 sh->checksum = check; 5913 SCTP_STAT_INCR(sctps_recvswcrc); 5914 if (calc_check != check) { 5915 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5916 calc_check, check, m, mlen, iphlen); 5917 5918 stcb = sctp_findassociation_addr(m, 5919 offset - sizeof(*ch), 5920 sh, ch, &inp, &net, 5921 vrf_id); 5922 if ((net) && (port)) { 5923 if (net->port == 0) { 5924 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5925 } 5926 net->port = port; 5927 } 5928 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5929 net->flowid = m->m_pkthdr.flowid; 5930#ifdef INVARIANTS 5931 net->flowidset = 1; 5932#endif 5933 } 5934 if ((inp) && (stcb)) { 5935 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5936 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5937 } else if ((inp != NULL) && (stcb == NULL)) { 5938 refcount_up = 1; 5939 } 5940 SCTP_STAT_INCR(sctps_badsum); 5941 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5942 goto bad; 5943 } 5944sctp_skip_csum_4: 5945#endif 5946 /* destination port of 0 is illegal, based on RFC2960. */ 5947 if (sh->dest_port == 0) { 5948 SCTP_STAT_INCR(sctps_hdrops); 5949 goto bad; 5950 } 5951 /* 5952 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5953 * IP/SCTP/first chunk header... 5954 */ 5955 stcb = sctp_findassociation_addr(m, offset - sizeof(*ch), 5956 sh, ch, &inp, &net, vrf_id); 5957 if ((net) && (port)) { 5958 if (net->port == 0) { 5959 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5960 } 5961 net->port = port; 5962 } 5963 if ((net != NULL) && (m->m_flags & M_FLOWID)) { 5964 net->flowid = m->m_pkthdr.flowid; 5965#ifdef INVARIANTS 5966 net->flowidset = 1; 5967#endif 5968 } 5969 /* inp's ref-count increased && stcb locked */ 5970 if (inp == NULL) { 5971 struct sctp_init_chunk *init_chk, chunk_buf; 5972 5973 SCTP_STAT_INCR(sctps_noport); 5974#ifdef ICMP_BANDLIM 5975 /* 5976 * we use the bandwidth limiting to protect against sending 5977 * too many ABORTS all at once. In this case these count the 5978 * same as an ICMP message. 5979 */ 5980 if (badport_bandlim(0) < 0) 5981 goto bad; 5982#endif /* ICMP_BANDLIM */ 5983 SCTPDBG(SCTP_DEBUG_INPUT1, 5984 "Sending a ABORT from packet entry!\n"); 5985 if (ch->chunk_type == SCTP_INITIATION) { 5986 /* 5987 * we do a trick here to get the INIT tag, dig in 5988 * and get the tag from the INIT and put it in the 5989 * common header. 5990 */ 5991 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5992 iphlen + sizeof(*sh), sizeof(*init_chk), 5993 (uint8_t *) & chunk_buf); 5994 if (init_chk != NULL) 5995 sh->v_tag = init_chk->init.initiate_tag; 5996 } 5997 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5998 sctp_send_shutdown_complete2(m, sh, vrf_id, port); 5999 goto bad; 6000 } 6001 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 6002 goto bad; 6003 } 6004 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 6005 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 6006 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 6007 (ch->chunk_type != SCTP_INIT))) { 6008 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 6009 } 6010 } 6011 goto bad; 6012 } else if (stcb == NULL) { 6013 refcount_up = 1; 6014 } 6015#ifdef IPSEC 6016 /* 6017 * I very much doubt any of the IPSEC stuff will work but I have no 6018 * idea, so I will leave it in place. 6019 */ 6020 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 6021 MODULE_GLOBAL(ipsec4stat).in_polvio++; 6022 SCTP_STAT_INCR(sctps_hdrops); 6023 goto bad; 6024 } 6025#endif /* IPSEC */ 6026 6027 /* 6028 * common chunk processing 6029 */ 6030 length = ip->ip_len + iphlen; 6031 offset -= sizeof(struct sctp_chunkhdr); 6032 6033 ecn_bits = ip->ip_tos; 6034 6035 /* sa_ignore NO_NULL_CHK */ 6036 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 6037 inp, stcb, net, ecn_bits, vrf_id, port); 6038 /* inp's ref-count reduced && stcb unlocked */ 6039 if (m) { 6040 sctp_m_freem(m); 6041 } 6042 if ((inp) && (refcount_up)) { 6043 /* reduce ref-count */ 6044 SCTP_INP_DECR_REF(inp); 6045 } 6046 return; 6047bad: 6048 if (stcb) { 6049 SCTP_TCB_UNLOCK(stcb); 6050 } 6051 if ((inp) && (refcount_up)) { 6052 /* reduce ref-count */ 6053 SCTP_INP_DECR_REF(inp); 6054 } 6055 if (m) { 6056 sctp_m_freem(m); 6057 } 6058 return; 6059} 6060 6061#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6062extern int *sctp_cpuarry; 6063 6064#endif 6065 6066void 6067sctp_input(struct mbuf *m, int off) 6068{ 6069#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6070 struct ip *ip; 6071 struct sctphdr *sh; 6072 int offset; 6073 int cpu_to_use; 6074 uint32_t flowid, tag; 6075 6076 if (mp_ncpus > 1) { 6077 if (m->m_flags & M_FLOWID) { 6078 flowid = m->m_pkthdr.flowid; 6079 } else { 6080 /* 6081 * No flow id built by lower layers fix it so we 6082 * create one. 6083 */ 6084 ip = mtod(m, struct ip *); 6085 offset = off + sizeof(*sh); 6086 if (SCTP_BUF_LEN(m) < offset) { 6087 if ((m = m_pullup(m, offset)) == 0) { 6088 SCTP_STAT_INCR(sctps_hdrops); 6089 return; 6090 } 6091 ip = mtod(m, struct ip *); 6092 } 6093 sh = (struct sctphdr *)((caddr_t)ip + off); 6094 tag = htonl(sh->v_tag); 6095 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6096 m->m_pkthdr.flowid = flowid; 6097 m->m_flags |= M_FLOWID; 6098 } 6099 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6100 sctp_queue_to_mcore(m, off, cpu_to_use); 6101 return; 6102 } 6103#endif 6104 sctp_input_with_port(m, off, 0); 6105} 6106 6107#endif 6108