sctp_input.c revision 188067
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31/* $KAME: sctp_input.c,v 1.27 2005/03/06 16:04:17 itojun Exp $ */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 188067 2009-02-03 11:04:03Z rrs $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#include <netinet/udp.h> 51 52 53 54static void 55sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 56{ 57 struct sctp_nets *net; 58 59 /* 60 * This now not only stops all cookie timers it also stops any INIT 61 * timers as well. This will make sure that the timers are stopped 62 * in all collision cases. 63 */ 64 SCTP_TCB_LOCK_ASSERT(stcb); 65 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 66 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 67 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 68 stcb->sctp_ep, 69 stcb, 70 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 71 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 72 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 73 stcb->sctp_ep, 74 stcb, 75 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 76 } 77 } 78} 79 80/* INIT handler */ 81static void 82sctp_handle_init(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh, 83 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, struct sctp_tcb *stcb, 84 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id, uint16_t port) 85{ 86 struct sctp_init *init; 87 struct mbuf *op_err; 88 uint32_t init_limit; 89 90 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 91 stcb); 92 if (stcb == NULL) { 93 SCTP_INP_RLOCK(inp); 94 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 95 goto outnow; 96 } 97 } 98 op_err = NULL; 99 init = &cp->init; 100 /* First are we accepting? */ 101 if ((inp->sctp_socket->so_qlimit == 0) && (stcb == NULL)) { 102 SCTPDBG(SCTP_DEBUG_INPUT2, 103 "sctp_handle_init: Abort, so_qlimit:%d\n", 104 inp->sctp_socket->so_qlimit); 105 /* 106 * FIX ME ?? What about TCP model and we have a 107 * match/restart case? Actually no fix is needed. the lookup 108 * will always find the existing assoc so stcb would not be 109 * NULL. It may be questionable to do this since we COULD 110 * just send back the INIT-ACK and hope that the app did 111 * accept()'s by the time the COOKIE was sent. But there is 112 * a price to pay for COOKIE generation and I don't want to 113 * pay it on the chance that the app will actually do some 114 * accepts(). The App just looses and should NOT be in this 115 * state :-) 116 */ 117 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 124 /* Invalid length */ 125 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 126 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 /* validate parameters */ 133 if (init->initiate_tag == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 136 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 143 /* invalid parameter... send abort */ 144 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 145 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 146 vrf_id, port); 147 if (stcb) 148 *abort_no_unlock = 1; 149 goto outnow; 150 } 151 if (init->num_inbound_streams == 0) { 152 /* protocol error... send abort */ 153 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 154 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 if (init->num_outbound_streams == 0) { 161 /* protocol error... send abort */ 162 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 163 sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 164 vrf_id, port); 165 if (stcb) 166 *abort_no_unlock = 1; 167 goto outnow; 168 } 169 init_limit = offset + ntohs(cp->ch.chunk_length); 170 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 171 init_limit)) { 172 /* auth parameter(s) error... send abort */ 173 sctp_abort_association(inp, stcb, m, iphlen, sh, NULL, vrf_id, port); 174 if (stcb) 175 *abort_no_unlock = 1; 176 goto outnow; 177 } 178 /* send an INIT-ACK w/cookie */ 179 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 180 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, sh, cp, vrf_id, port, 181 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 182outnow: 183 if (stcb == NULL) { 184 SCTP_INP_RUNLOCK(inp); 185 } 186} 187 188/* 189 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 190 */ 191 192int 193sctp_is_there_unsent_data(struct sctp_tcb *stcb) 194{ 195 int unsent_data = 0; 196 struct sctp_stream_queue_pending *sp; 197 struct sctp_stream_out *strq; 198 struct sctp_association *asoc; 199 200 /* 201 * This function returns the number of streams that have true unsent 202 * data on them. Note that as it looks through it will clean up any 203 * places that have old data that has been sent but left at top of 204 * stream queue. 205 */ 206 asoc = &stcb->asoc; 207 SCTP_TCB_SEND_LOCK(stcb); 208 if (!TAILQ_EMPTY(&asoc->out_wheel)) { 209 /* Check to see if some data queued */ 210 TAILQ_FOREACH(strq, &asoc->out_wheel, next_spoke) { 211 is_there_another: 212 /* sa_ignore FREED_MEMORY */ 213 sp = TAILQ_FIRST(&strq->outqueue); 214 if (sp == NULL) { 215 continue; 216 } 217 if ((sp->msg_is_complete) && 218 (sp->length == 0) && 219 (sp->sender_all_done)) { 220 /* 221 * We are doing differed cleanup. Last time 222 * through when we took all the data the 223 * sender_all_done was not set. 224 */ 225 if (sp->put_last_out == 0) { 226 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 227 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 228 sp->sender_all_done, 229 sp->length, 230 sp->msg_is_complete, 231 sp->put_last_out); 232 } 233 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 234 TAILQ_REMOVE(&strq->outqueue, sp, next); 235 sctp_free_remote_addr(sp->net); 236 if (sp->data) { 237 sctp_m_freem(sp->data); 238 sp->data = NULL; 239 } 240 sctp_free_a_strmoq(stcb, sp); 241 goto is_there_another; 242 } else { 243 unsent_data++; 244 continue; 245 } 246 } 247 } 248 SCTP_TCB_SEND_UNLOCK(stcb); 249 return (unsent_data); 250} 251 252static int 253sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb, 254 struct sctp_nets *net) 255{ 256 struct sctp_init *init; 257 struct sctp_association *asoc; 258 struct sctp_nets *lnet; 259 unsigned int i; 260 261 init = &cp->init; 262 asoc = &stcb->asoc; 263 /* save off parameters */ 264 asoc->peer_vtag = ntohl(init->initiate_tag); 265 asoc->peers_rwnd = ntohl(init->a_rwnd); 266 if (TAILQ_FIRST(&asoc->nets)) { 267 /* update any ssthresh's that may have a default */ 268 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 269 lnet->ssthresh = asoc->peers_rwnd; 270 271 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 272 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 273 } 274 } 275 } 276 SCTP_TCB_SEND_LOCK(stcb); 277 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 278 unsigned int newcnt; 279 struct sctp_stream_out *outs; 280 struct sctp_stream_queue_pending *sp; 281 282 /* cut back on number of streams */ 283 newcnt = ntohs(init->num_inbound_streams); 284 /* This if is probably not needed but I am cautious */ 285 if (asoc->strmout) { 286 /* First make sure no data chunks are trapped */ 287 for (i = newcnt; i < asoc->pre_open_streams; i++) { 288 outs = &asoc->strmout[i]; 289 sp = TAILQ_FIRST(&outs->outqueue); 290 while (sp) { 291 TAILQ_REMOVE(&outs->outqueue, sp, 292 next); 293 asoc->stream_queue_cnt--; 294 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 295 stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, 296 sp, SCTP_SO_NOT_LOCKED); 297 if (sp->data) { 298 sctp_m_freem(sp->data); 299 sp->data = NULL; 300 } 301 sctp_free_remote_addr(sp->net); 302 sp->net = NULL; 303 /* Free the chunk */ 304 SCTP_PRINTF("sp:%p tcb:%p weird free case\n", 305 sp, stcb); 306 307 sctp_free_a_strmoq(stcb, sp); 308 /* sa_ignore FREED_MEMORY */ 309 sp = TAILQ_FIRST(&outs->outqueue); 310 } 311 } 312 } 313 /* cut back the count and abandon the upper streams */ 314 asoc->pre_open_streams = newcnt; 315 } 316 SCTP_TCB_SEND_UNLOCK(stcb); 317 asoc->streamoutcnt = asoc->pre_open_streams; 318 /* init tsn's */ 319 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 320 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 321 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 322 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 323 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 324 } 325 /* This is the next one we expect */ 326 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 327 328 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 329 /* 330 * EY 05/13/08 - nr_sack: initialize nr_mapping array's base tsn 331 * like above 332 */ 333 asoc->nr_mapping_array_base_tsn = ntohl(init->initial_tsn); 334 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 335 asoc->last_echo_tsn = asoc->asconf_seq_in; 336 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 337 /* open the requested streams */ 338 339 if (asoc->strmin != NULL) { 340 /* Free the old ones */ 341 struct sctp_queued_to_read *ctl; 342 343 for (i = 0; i < asoc->streamincnt; i++) { 344 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 345 while (ctl) { 346 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 347 sctp_free_remote_addr(ctl->whoFrom); 348 ctl->whoFrom = NULL; 349 sctp_m_freem(ctl->data); 350 ctl->data = NULL; 351 sctp_free_a_readq(stcb, ctl); 352 ctl = TAILQ_FIRST(&asoc->strmin[i].inqueue); 353 } 354 } 355 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 356 } 357 asoc->streamincnt = ntohs(init->num_outbound_streams); 358 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 359 asoc->streamincnt = MAX_SCTP_STREAMS; 360 } 361 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 362 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 363 if (asoc->strmin == NULL) { 364 /* we didn't get memory for the streams! */ 365 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 366 return (-1); 367 } 368 for (i = 0; i < asoc->streamincnt; i++) { 369 asoc->strmin[i].stream_no = i; 370 asoc->strmin[i].last_sequence_delivered = 0xffff; 371 /* 372 * U-stream ranges will be set when the cookie is unpacked. 373 * Or for the INIT sender they are un set (if pr-sctp not 374 * supported) when the INIT-ACK arrives. 375 */ 376 TAILQ_INIT(&asoc->strmin[i].inqueue); 377 asoc->strmin[i].delivery_started = 0; 378 } 379 /* 380 * load_address_from_init will put the addresses into the 381 * association when the COOKIE is processed or the INIT-ACK is 382 * processed. Both types of COOKIE's existing and new call this 383 * routine. It will remove addresses that are no longer in the 384 * association (for the restarting case where addresses are 385 * removed). Up front when the INIT arrives we will discard it if it 386 * is a restart and new addresses have been added. 387 */ 388 /* sa_ignore MEMLEAK */ 389 return (0); 390} 391 392/* 393 * INIT-ACK message processing/consumption returns value < 0 on error 394 */ 395static int 396sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 397 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 398 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 399{ 400 struct sctp_association *asoc; 401 struct mbuf *op_err; 402 int retval, abort_flag; 403 uint32_t initack_limit; 404 int nat_friendly = 0; 405 406 /* First verify that we have no illegal param's */ 407 abort_flag = 0; 408 op_err = NULL; 409 410 op_err = sctp_arethere_unrecognized_parameters(m, 411 (offset + sizeof(struct sctp_init_chunk)), 412 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_CAUSE_PROTOCOL_VIOLATION, op_err, SCTP_SO_NOT_LOCKED); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 asoc = &stcb->asoc; 420 asoc->peer_supports_nat = (uint8_t) nat_friendly; 421 /* process the peer's parameters in the INIT-ACK */ 422 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb, net); 423 if (retval < 0) { 424 return (retval); 425 } 426 initack_limit = offset + ntohs(cp->ch.chunk_length); 427 /* load all addresses */ 428 if ((retval = sctp_load_addresses_from_init(stcb, m, iphlen, 429 (offset + sizeof(struct sctp_init_chunk)), initack_limit, sh, 430 NULL))) { 431 /* Huh, we should abort */ 432 SCTPDBG(SCTP_DEBUG_INPUT1, 433 "Load addresses from INIT causes an abort %d\n", 434 retval); 435 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 436 NULL, 0, net->port); 437 *abort_no_unlock = 1; 438 return (-1); 439 } 440 /* if the peer doesn't support asconf, flush the asconf queue */ 441 if (asoc->peer_supports_asconf == 0) { 442 struct sctp_asconf_addr *aparam; 443 444 while (!TAILQ_EMPTY(&asoc->asconf_queue)) { 445 /* sa_ignore FREED_MEMORY */ 446 aparam = TAILQ_FIRST(&asoc->asconf_queue); 447 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 448 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 449 } 450 } 451 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 452 stcb->asoc.local_hmacs); 453 if (op_err) { 454 sctp_queue_op_err(stcb, op_err); 455 /* queuing will steal away the mbuf chain to the out queue */ 456 op_err = NULL; 457 } 458 /* extract the cookie and queue it to "echo" it back... */ 459 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 460 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 461 stcb->asoc.overall_error_count, 462 0, 463 SCTP_FROM_SCTP_INPUT, 464 __LINE__); 465 } 466 stcb->asoc.overall_error_count = 0; 467 net->error_count = 0; 468 469 /* 470 * Cancel the INIT timer, We do this first before queueing the 471 * cookie. We always cancel at the primary to assue that we are 472 * canceling the timer started by the INIT which always goes to the 473 * primary. 474 */ 475 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 476 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 477 478 /* calculate the RTO */ 479 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 480 481 retval = sctp_send_cookie_echo(m, offset, stcb, net); 482 if (retval < 0) { 483 /* 484 * No cookie, we probably should send a op error. But in any 485 * case if there is no cookie in the INIT-ACK, we can 486 * abandon the peer, its broke. 487 */ 488 if (retval == -3) { 489 /* We abort with an error of missing mandatory param */ 490 op_err = 491 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 492 if (op_err) { 493 /* 494 * Expand beyond to include the mandatory 495 * param cookie 496 */ 497 struct sctp_inv_mandatory_param *mp; 498 499 SCTP_BUF_LEN(op_err) = 500 sizeof(struct sctp_inv_mandatory_param); 501 mp = mtod(op_err, 502 struct sctp_inv_mandatory_param *); 503 /* Subtract the reserved param */ 504 mp->length = 505 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 506 mp->num_param = htonl(1); 507 mp->param = htons(SCTP_STATE_COOKIE); 508 mp->resv = 0; 509 } 510 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 511 sh, op_err, 0, net->port); 512 *abort_no_unlock = 1; 513 } 514 return (retval); 515 } 516 return (0); 517} 518 519static void 520sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 521 struct sctp_tcb *stcb, struct sctp_nets *net) 522{ 523 struct sockaddr_storage store; 524 struct sockaddr_in *sin; 525 struct sockaddr_in6 *sin6; 526 struct sctp_nets *r_net; 527 struct timeval tv; 528 int req_prim = 0; 529 530 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 531 /* Invalid length */ 532 return; 533 } 534 sin = (struct sockaddr_in *)&store; 535 sin6 = (struct sockaddr_in6 *)&store; 536 537 memset(&store, 0, sizeof(store)); 538 if (cp->heartbeat.hb_info.addr_family == AF_INET && 539 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 540 sin->sin_family = cp->heartbeat.hb_info.addr_family; 541 sin->sin_len = cp->heartbeat.hb_info.addr_len; 542 sin->sin_port = stcb->rport; 543 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 544 sizeof(sin->sin_addr)); 545 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 546 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 547 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 548 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 549 sin6->sin6_port = stcb->rport; 550 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 551 sizeof(sin6->sin6_addr)); 552 } else { 553 return; 554 } 555 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 556 if (r_net == NULL) { 557 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 558 return; 559 } 560 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 561 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 562 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 563 /* 564 * If the its a HB and it's random value is correct when can 565 * confirm the destination. 566 */ 567 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 568 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 569 stcb->asoc.primary_destination = r_net; 570 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 571 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 572 r_net = TAILQ_FIRST(&stcb->asoc.nets); 573 if (r_net != stcb->asoc.primary_destination) { 574 /* 575 * first one on the list is NOT the primary 576 * sctp_cmpaddr() is much more efficent if 577 * the primary is the first on the list, 578 * make it so. 579 */ 580 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 581 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 582 } 583 req_prim = 1; 584 } 585 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 586 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 587 } 588 r_net->error_count = 0; 589 r_net->hb_responded = 1; 590 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 591 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 592 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 593 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 594 r_net->dest_state |= SCTP_ADDR_REACHABLE; 595 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 596 SCTP_HEARTBEAT_SUCCESS, (void *)r_net, SCTP_SO_NOT_LOCKED); 597 /* now was it the primary? if so restore */ 598 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 599 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 600 } 601 } 602 /* 603 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 604 * set the destination to active state and set the cwnd to one or 605 * two MTU's based on whether PF1 or PF2 is being used. If a T3 606 * timer is running, for the destination, stop the timer because a 607 * PF-heartbeat was received. 608 */ 609 if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && 610 SCTP_BASE_SYSCTL(sctp_cmt_pf) && 611 (net->dest_state & SCTP_ADDR_PF) == SCTP_ADDR_PF) { 612 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 613 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 614 stcb, net, 615 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 616 } 617 net->dest_state &= ~SCTP_ADDR_PF; 618 net->cwnd = net->mtu * SCTP_BASE_SYSCTL(sctp_cmt_pf); 619 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 620 net, net->cwnd); 621 } 622 /* Now lets do a RTO with this */ 623 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 624 /* Mobility adaptation */ 625 if (req_prim) { 626 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 627 SCTP_MOBILITY_BASE) || 628 sctp_is_mobility_feature_on(stcb->sctp_ep, 629 SCTP_MOBILITY_FASTHANDOFF)) && 630 sctp_is_mobility_feature_on(stcb->sctp_ep, 631 SCTP_MOBILITY_PRIM_DELETED)) { 632 633 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 634 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 635 SCTP_MOBILITY_FASTHANDOFF)) { 636 sctp_assoc_immediate_retrans(stcb, 637 stcb->asoc.primary_destination); 638 } 639 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 640 SCTP_MOBILITY_BASE)) { 641 sctp_move_chunks_from_deleted_prim(stcb, 642 stcb->asoc.primary_destination); 643 } 644 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 645 stcb->asoc.deleted_primary); 646 } 647 } 648} 649 650static int 651sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 652{ 653 /* 654 * return 0 means we want you to proceed with the abort non-zero 655 * means no abort processing 656 */ 657 struct sctpasochead *head; 658 659 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 660 /* generate a new vtag and send init */ 661 LIST_REMOVE(stcb, sctp_asocs); 662 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 663 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 664 /* 665 * put it in the bucket in the vtag hash of assoc's for the 666 * system 667 */ 668 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 669 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 670 return (1); 671 } 672 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 673 /* 674 * treat like a case where the cookie expired i.e.: - dump 675 * current cookie. - generate a new vtag. - resend init. 676 */ 677 /* generate a new vtag and send init */ 678 LIST_REMOVE(stcb, sctp_asocs); 679 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 680 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 681 sctp_stop_all_cookie_timers(stcb); 682 sctp_toss_old_cookies(stcb, &stcb->asoc); 683 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 684 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 685 /* 686 * put it in the bucket in the vtag hash of assoc's for the 687 * system 688 */ 689 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 690 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 691 return (1); 692 } 693 return (0); 694} 695 696static int 697sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 698 struct sctp_nets *net) 699{ 700 /* 701 * return 0 means we want you to proceed with the abort non-zero 702 * means no abort processing 703 */ 704 if (stcb->asoc.peer_supports_auth == 0) { 705 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 706 return (0); 707 } 708 sctp_asconf_send_nat_state_update(stcb, net); 709 return (1); 710} 711 712 713static void 714sctp_handle_abort(struct sctp_abort_chunk *cp, 715 struct sctp_tcb *stcb, struct sctp_nets *net) 716{ 717#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 718 struct socket *so; 719 720#endif 721 uint16_t len; 722 723 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 724 if (stcb == NULL) 725 return; 726 727 len = ntohs(cp->ch.chunk_length); 728 if (len > sizeof(struct sctp_chunkhdr)) { 729 /* 730 * Need to check the cause codes for our two magic nat 731 * aborts which don't kill the assoc necessarily. 732 */ 733 struct sctp_abort_chunk *cpnext; 734 struct sctp_missing_nat_state *natc; 735 uint16_t cause; 736 737 cpnext = cp; 738 cpnext++; 739 natc = (struct sctp_missing_nat_state *)cpnext; 740 cause = ntohs(natc->cause); 741 if (cause == SCTP_CAUSE_NAT_COLLIDING_STATE) { 742 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 743 cp->ch.chunk_flags); 744 if (sctp_handle_nat_colliding_state(stcb)) { 745 return; 746 } 747 } else if (cause == SCTP_CAUSE_NAT_MISSING_STATE) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 749 cp->ch.chunk_flags); 750 if (sctp_handle_nat_missing_state(stcb, net)) { 751 return; 752 } 753 } 754 } 755 /* stop any receive timers */ 756 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 757 /* notify user of the abort and clean up... */ 758 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 759 /* free the tcb */ 760#if defined(SCTP_PANIC_ON_ABORT) 761 printf("stcb:%p state:%d rport:%d net:%p\n", 762 stcb, stcb->asoc.state, stcb->rport, net); 763 if (!(stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { 764 panic("Received an ABORT"); 765 } else { 766 printf("No panic its in state %x closed\n", stcb->asoc.state); 767 } 768#endif 769 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 770 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 771 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 772 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 773 } 774#ifdef SCTP_ASOCLOG_OF_TSNS 775 sctp_print_out_track_log(stcb); 776#endif 777#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 778 so = SCTP_INP_SO(stcb->sctp_ep); 779 atomic_add_int(&stcb->asoc.refcnt, 1); 780 SCTP_TCB_UNLOCK(stcb); 781 SCTP_SOCKET_LOCK(so, 1); 782 SCTP_TCB_LOCK(stcb); 783 atomic_subtract_int(&stcb->asoc.refcnt, 1); 784#endif 785 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 786 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 787 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 788#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 789 SCTP_SOCKET_UNLOCK(so, 1); 790#endif 791 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 792} 793 794static void 795sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 796 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 797{ 798 struct sctp_association *asoc; 799 int some_on_streamwheel; 800 801#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 802 struct socket *so; 803 804#endif 805 806 SCTPDBG(SCTP_DEBUG_INPUT2, 807 "sctp_handle_shutdown: handling SHUTDOWN\n"); 808 if (stcb == NULL) 809 return; 810 asoc = &stcb->asoc; 811 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 812 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 813 return; 814 } 815 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 816 /* Shutdown NOT the expected size */ 817 return; 818 } else { 819 sctp_update_acked(stcb, cp, net, abort_flag); 820 } 821 if (asoc->control_pdapi) { 822 /* 823 * With a normal shutdown we assume the end of last record. 824 */ 825 SCTP_INP_READ_LOCK(stcb->sctp_ep); 826 asoc->control_pdapi->end_added = 1; 827 asoc->control_pdapi->pdapi_aborted = 1; 828 asoc->control_pdapi = NULL; 829 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 830#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 831 so = SCTP_INP_SO(stcb->sctp_ep); 832 atomic_add_int(&stcb->asoc.refcnt, 1); 833 SCTP_TCB_UNLOCK(stcb); 834 SCTP_SOCKET_LOCK(so, 1); 835 SCTP_TCB_LOCK(stcb); 836 atomic_subtract_int(&stcb->asoc.refcnt, 1); 837 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 838 /* assoc was freed while we were unlocked */ 839 SCTP_SOCKET_UNLOCK(so, 1); 840 return; 841 } 842#endif 843 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 844#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 845 SCTP_SOCKET_UNLOCK(so, 1); 846#endif 847 } 848 /* goto SHUTDOWN_RECEIVED state to block new requests */ 849 if (stcb->sctp_socket) { 850 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 851 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 852 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 853 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 854 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 855 /* 856 * notify upper layer that peer has initiated a 857 * shutdown 858 */ 859 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 860 861 /* reset time */ 862 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 863 } 864 } 865 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 866 /* 867 * stop the shutdown timer, since we WILL move to 868 * SHUTDOWN-ACK-SENT. 869 */ 870 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 871 } 872 /* Now is there unsent data on a stream somewhere? */ 873 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 874 875 if (!TAILQ_EMPTY(&asoc->send_queue) || 876 !TAILQ_EMPTY(&asoc->sent_queue) || 877 some_on_streamwheel) { 878 /* By returning we will push more data out */ 879 return; 880 } else { 881 /* no outstanding data to send, so move on... */ 882 /* send SHUTDOWN-ACK */ 883 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 884 /* move to SHUTDOWN-ACK-SENT state */ 885 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 886 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 887 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 888 } 889 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 890 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 891 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 892 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 893 /* start SHUTDOWN timer */ 894 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 895 stcb, net); 896 } 897} 898 899static void 900sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 901 struct sctp_tcb *stcb, struct sctp_nets *net) 902{ 903 struct sctp_association *asoc; 904 905#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 906 struct socket *so; 907 908 so = SCTP_INP_SO(stcb->sctp_ep); 909#endif 910 SCTPDBG(SCTP_DEBUG_INPUT2, 911 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 912 if (stcb == NULL) 913 return; 914 915 asoc = &stcb->asoc; 916 /* process according to association state */ 917 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 918 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 919 /* unexpected SHUTDOWN-ACK... so ignore... */ 920 SCTP_TCB_UNLOCK(stcb); 921 return; 922 } 923 if (asoc->control_pdapi) { 924 /* 925 * With a normal shutdown we assume the end of last record. 926 */ 927 SCTP_INP_READ_LOCK(stcb->sctp_ep); 928 asoc->control_pdapi->end_added = 1; 929 asoc->control_pdapi->pdapi_aborted = 1; 930 asoc->control_pdapi = NULL; 931 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 932#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 933 atomic_add_int(&stcb->asoc.refcnt, 1); 934 SCTP_TCB_UNLOCK(stcb); 935 SCTP_SOCKET_LOCK(so, 1); 936 SCTP_TCB_LOCK(stcb); 937 atomic_subtract_int(&stcb->asoc.refcnt, 1); 938 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 939 /* assoc was freed while we were unlocked */ 940 SCTP_SOCKET_UNLOCK(so, 1); 941 return; 942 } 943#endif 944 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 945#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 946 SCTP_SOCKET_UNLOCK(so, 1); 947#endif 948 } 949 /* are the queues empty? */ 950 if (!TAILQ_EMPTY(&asoc->send_queue) || 951 !TAILQ_EMPTY(&asoc->sent_queue) || 952 !TAILQ_EMPTY(&asoc->out_wheel)) { 953 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 954 } 955 /* stop the timer */ 956 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 957 /* send SHUTDOWN-COMPLETE */ 958 sctp_send_shutdown_complete(stcb, net); 959 /* notify upper layer protocol */ 960 if (stcb->sctp_socket) { 961 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 962 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 963 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 964 /* Set the connected flag to disconnected */ 965 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 966 } 967 } 968 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 969 /* free the TCB but first save off the ep */ 970#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 971 atomic_add_int(&stcb->asoc.refcnt, 1); 972 SCTP_TCB_UNLOCK(stcb); 973 SCTP_SOCKET_LOCK(so, 1); 974 SCTP_TCB_LOCK(stcb); 975 atomic_subtract_int(&stcb->asoc.refcnt, 1); 976#endif 977 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 978 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 979#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 980 SCTP_SOCKET_UNLOCK(so, 1); 981#endif 982} 983 984/* 985 * Skip past the param header and then we will find the chunk that caused the 986 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 987 * our peer must be broken. 988 */ 989static void 990sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 991 struct sctp_nets *net) 992{ 993 struct sctp_chunkhdr *chk; 994 995 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 996 switch (chk->chunk_type) { 997 case SCTP_ASCONF_ACK: 998 case SCTP_ASCONF: 999 sctp_asconf_cleanup(stcb, net); 1000 break; 1001 case SCTP_FORWARD_CUM_TSN: 1002 stcb->asoc.peer_supports_prsctp = 0; 1003 break; 1004 default: 1005 SCTPDBG(SCTP_DEBUG_INPUT2, 1006 "Peer does not support chunk type %d(%x)??\n", 1007 chk->chunk_type, (uint32_t) chk->chunk_type); 1008 break; 1009 } 1010} 1011 1012/* 1013 * Skip past the param header and then we will find the param that caused the 1014 * problem. There are a number of param's in a ASCONF OR the prsctp param 1015 * these will turn of specific features. 1016 */ 1017static void 1018sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1019{ 1020 struct sctp_paramhdr *pbad; 1021 1022 pbad = phdr + 1; 1023 switch (ntohs(pbad->param_type)) { 1024 /* pr-sctp draft */ 1025 case SCTP_PRSCTP_SUPPORTED: 1026 stcb->asoc.peer_supports_prsctp = 0; 1027 break; 1028 case SCTP_SUPPORTED_CHUNK_EXT: 1029 break; 1030 /* draft-ietf-tsvwg-addip-sctp */ 1031 case SCTP_HAS_NAT_SUPPORT: 1032 stcb->asoc.peer_supports_nat = 0; 1033 break; 1034 case SCTP_ECN_NONCE_SUPPORTED: 1035 stcb->asoc.peer_supports_ecn_nonce = 0; 1036 stcb->asoc.ecn_nonce_allowed = 0; 1037 stcb->asoc.ecn_allowed = 0; 1038 break; 1039 case SCTP_ADD_IP_ADDRESS: 1040 case SCTP_DEL_IP_ADDRESS: 1041 case SCTP_SET_PRIM_ADDR: 1042 stcb->asoc.peer_supports_asconf = 0; 1043 break; 1044 case SCTP_SUCCESS_REPORT: 1045 case SCTP_ERROR_CAUSE_IND: 1046 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1047 SCTPDBG(SCTP_DEBUG_INPUT2, 1048 "Turning off ASCONF to this strange peer\n"); 1049 stcb->asoc.peer_supports_asconf = 0; 1050 break; 1051 default: 1052 SCTPDBG(SCTP_DEBUG_INPUT2, 1053 "Peer does not support param type %d(%x)??\n", 1054 pbad->param_type, (uint32_t) pbad->param_type); 1055 break; 1056 } 1057} 1058 1059static int 1060sctp_handle_error(struct sctp_chunkhdr *ch, 1061 struct sctp_tcb *stcb, struct sctp_nets *net) 1062{ 1063 int chklen; 1064 struct sctp_paramhdr *phdr; 1065 uint16_t error_type; 1066 uint16_t error_len; 1067 struct sctp_association *asoc; 1068 int adjust; 1069 1070#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1071 struct socket *so; 1072 1073#endif 1074 1075 /* parse through all of the errors and process */ 1076 asoc = &stcb->asoc; 1077 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1078 sizeof(struct sctp_chunkhdr)); 1079 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1080 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1081 /* Process an Error Cause */ 1082 error_type = ntohs(phdr->param_type); 1083 error_len = ntohs(phdr->param_length); 1084 if ((error_len > chklen) || (error_len == 0)) { 1085 /* invalid param length for this param */ 1086 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1087 chklen, error_len); 1088 return (0); 1089 } 1090 switch (error_type) { 1091 case SCTP_CAUSE_INVALID_STREAM: 1092 case SCTP_CAUSE_MISSING_PARAM: 1093 case SCTP_CAUSE_INVALID_PARAM: 1094 case SCTP_CAUSE_NO_USER_DATA: 1095 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1096 error_type); 1097 break; 1098 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1099 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1100 ch->chunk_flags); 1101 if (sctp_handle_nat_colliding_state(stcb)) { 1102 return (0); 1103 } 1104 break; 1105 case SCTP_CAUSE_NAT_MISSING_STATE: 1106 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1107 ch->chunk_flags); 1108 if (sctp_handle_nat_missing_state(stcb, net)) { 1109 return (0); 1110 } 1111 break; 1112 case SCTP_CAUSE_STALE_COOKIE: 1113 /* 1114 * We only act if we have echoed a cookie and are 1115 * waiting. 1116 */ 1117 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1118 int *p; 1119 1120 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1121 /* Save the time doubled */ 1122 asoc->cookie_preserve_req = ntohl(*p) << 1; 1123 asoc->stale_cookie_count++; 1124 if (asoc->stale_cookie_count > 1125 asoc->max_init_times) { 1126 sctp_abort_notification(stcb, 0, SCTP_SO_NOT_LOCKED); 1127 /* now free the asoc */ 1128#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1129 so = SCTP_INP_SO(stcb->sctp_ep); 1130 atomic_add_int(&stcb->asoc.refcnt, 1); 1131 SCTP_TCB_UNLOCK(stcb); 1132 SCTP_SOCKET_LOCK(so, 1); 1133 SCTP_TCB_LOCK(stcb); 1134 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1135#endif 1136 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1138#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1139 SCTP_SOCKET_UNLOCK(so, 1); 1140#endif 1141 return (-1); 1142 } 1143 /* blast back to INIT state */ 1144 sctp_toss_old_cookies(stcb, &stcb->asoc); 1145 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1146 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1147 sctp_stop_all_cookie_timers(stcb); 1148 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1149 } 1150 break; 1151 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1152 /* 1153 * Nothing we can do here, we don't do hostname 1154 * addresses so if the peer does not like my IPv6 1155 * (or IPv4 for that matter) it does not matter. If 1156 * they don't support that type of address, they can 1157 * NOT possibly get that packet type... i.e. with no 1158 * IPv6 you can't recieve a IPv6 packet. so we can 1159 * safely ignore this one. If we ever added support 1160 * for HOSTNAME Addresses, then we would need to do 1161 * something here. 1162 */ 1163 break; 1164 case SCTP_CAUSE_UNRECOG_CHUNK: 1165 sctp_process_unrecog_chunk(stcb, phdr, net); 1166 break; 1167 case SCTP_CAUSE_UNRECOG_PARAM: 1168 sctp_process_unrecog_param(stcb, phdr); 1169 break; 1170 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1171 /* 1172 * We ignore this since the timer will drive out a 1173 * new cookie anyway and there timer will drive us 1174 * to send a SHUTDOWN_COMPLETE. We can't send one 1175 * here since we don't have their tag. 1176 */ 1177 break; 1178 case SCTP_CAUSE_DELETING_LAST_ADDR: 1179 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1180 case SCTP_CAUSE_DELETING_SRC_ADDR: 1181 /* 1182 * We should NOT get these here, but in a 1183 * ASCONF-ACK. 1184 */ 1185 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1186 error_type); 1187 break; 1188 case SCTP_CAUSE_OUT_OF_RESC: 1189 /* 1190 * And what, pray tell do we do with the fact that 1191 * the peer is out of resources? Not really sure we 1192 * could do anything but abort. I suspect this 1193 * should have came WITH an abort instead of in a 1194 * OP-ERROR. 1195 */ 1196 break; 1197 default: 1198 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1199 error_type); 1200 break; 1201 } 1202 adjust = SCTP_SIZE32(error_len); 1203 chklen -= adjust; 1204 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1205 } 1206 return (0); 1207} 1208 1209static int 1210sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1211 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1212 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 1213{ 1214 struct sctp_init_ack *init_ack; 1215 struct mbuf *op_err; 1216 1217 SCTPDBG(SCTP_DEBUG_INPUT2, 1218 "sctp_handle_init_ack: handling INIT-ACK\n"); 1219 1220 if (stcb == NULL) { 1221 SCTPDBG(SCTP_DEBUG_INPUT2, 1222 "sctp_handle_init_ack: TCB is null\n"); 1223 return (-1); 1224 } 1225 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1226 /* Invalid length */ 1227 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1228 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1229 op_err, 0, net->port); 1230 *abort_no_unlock = 1; 1231 return (-1); 1232 } 1233 init_ack = &cp->init; 1234 /* validate parameters */ 1235 if (init_ack->initiate_tag == 0) { 1236 /* protocol error... send an abort */ 1237 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1238 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1239 op_err, 0, net->port); 1240 *abort_no_unlock = 1; 1241 return (-1); 1242 } 1243 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1244 /* protocol error... send an abort */ 1245 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1246 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1247 op_err, 0, net->port); 1248 *abort_no_unlock = 1; 1249 return (-1); 1250 } 1251 if (init_ack->num_inbound_streams == 0) { 1252 /* protocol error... send an abort */ 1253 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1254 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1255 op_err, 0, net->port); 1256 *abort_no_unlock = 1; 1257 return (-1); 1258 } 1259 if (init_ack->num_outbound_streams == 0) { 1260 /* protocol error... send an abort */ 1261 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1262 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1263 op_err, 0, net->port); 1264 *abort_no_unlock = 1; 1265 return (-1); 1266 } 1267 /* process according to association state... */ 1268 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1269 case SCTP_STATE_COOKIE_WAIT: 1270 /* this is the expected state for this chunk */ 1271 /* process the INIT-ACK parameters */ 1272 if (stcb->asoc.primary_destination->dest_state & 1273 SCTP_ADDR_UNCONFIRMED) { 1274 /* 1275 * The primary is where we sent the INIT, we can 1276 * always consider it confirmed when the INIT-ACK is 1277 * returned. Do this before we load addresses 1278 * though. 1279 */ 1280 stcb->asoc.primary_destination->dest_state &= 1281 ~SCTP_ADDR_UNCONFIRMED; 1282 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1283 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1284 } 1285 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1286 net, abort_no_unlock, vrf_id) < 0) { 1287 /* error in parsing parameters */ 1288 return (-1); 1289 } 1290 /* update our state */ 1291 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1292 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1293 1294 /* reset the RTO calc */ 1295 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1296 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1297 stcb->asoc.overall_error_count, 1298 0, 1299 SCTP_FROM_SCTP_INPUT, 1300 __LINE__); 1301 } 1302 stcb->asoc.overall_error_count = 0; 1303 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1304 /* 1305 * collapse the init timer back in case of a exponential 1306 * backoff 1307 */ 1308 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1309 stcb, net); 1310 /* 1311 * the send at the end of the inbound data processing will 1312 * cause the cookie to be sent 1313 */ 1314 break; 1315 case SCTP_STATE_SHUTDOWN_SENT: 1316 /* incorrect state... discard */ 1317 break; 1318 case SCTP_STATE_COOKIE_ECHOED: 1319 /* incorrect state... discard */ 1320 break; 1321 case SCTP_STATE_OPEN: 1322 /* incorrect state... discard */ 1323 break; 1324 case SCTP_STATE_EMPTY: 1325 case SCTP_STATE_INUSE: 1326 default: 1327 /* incorrect state... discard */ 1328 return (-1); 1329 break; 1330 } 1331 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1332 return (0); 1333} 1334 1335static struct sctp_tcb * 1336sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1337 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1338 struct sctp_inpcb *inp, struct sctp_nets **netp, 1339 struct sockaddr *init_src, int *notification, 1340 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1341 uint32_t vrf_id, uint16_t port); 1342 1343 1344/* 1345 * handle a state cookie for an existing association m: input packet mbuf 1346 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1347 * "split" mbuf and the cookie signature does not exist offset: offset into 1348 * mbuf to the cookie-echo chunk 1349 */ 1350static struct sctp_tcb * 1351sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1352 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1353 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1354 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1355 uint32_t vrf_id, int auth_skipped, uint32_t auth_offset, uint32_t auth_len, uint16_t port) 1356{ 1357 struct sctp_association *asoc; 1358 struct sctp_init_chunk *init_cp, init_buf; 1359 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1360 struct sctp_nets *net; 1361 struct mbuf *op_err; 1362 struct sctp_paramhdr *ph; 1363 int chk_length; 1364 int init_offset, initack_offset, i; 1365 int retval; 1366 int spec_flag = 0; 1367 uint32_t how_indx; 1368 1369 net = *netp; 1370 /* I know that the TCB is non-NULL from the caller */ 1371 asoc = &stcb->asoc; 1372 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1373 if (asoc->cookie_how[how_indx] == 0) 1374 break; 1375 } 1376 if (how_indx < sizeof(asoc->cookie_how)) { 1377 asoc->cookie_how[how_indx] = 1; 1378 } 1379 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1380 /* SHUTDOWN came in after sending INIT-ACK */ 1381 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1382 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1383 0, M_DONTWAIT, 1, MT_DATA); 1384 if (op_err == NULL) { 1385 /* FOOBAR */ 1386 return (NULL); 1387 } 1388 /* Set the len */ 1389 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1390 ph = mtod(op_err, struct sctp_paramhdr *); 1391 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1392 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1393 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1394 vrf_id, net->port); 1395 if (how_indx < sizeof(asoc->cookie_how)) 1396 asoc->cookie_how[how_indx] = 2; 1397 return (NULL); 1398 } 1399 /* 1400 * find and validate the INIT chunk in the cookie (peer's info) the 1401 * INIT should start after the cookie-echo header struct (chunk 1402 * header, state cookie header struct) 1403 */ 1404 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1405 1406 init_cp = (struct sctp_init_chunk *) 1407 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1408 (uint8_t *) & init_buf); 1409 if (init_cp == NULL) { 1410 /* could not pull a INIT chunk in cookie */ 1411 return (NULL); 1412 } 1413 chk_length = ntohs(init_cp->ch.chunk_length); 1414 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1415 return (NULL); 1416 } 1417 /* 1418 * find and validate the INIT-ACK chunk in the cookie (my info) the 1419 * INIT-ACK follows the INIT chunk 1420 */ 1421 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1422 initack_cp = (struct sctp_init_ack_chunk *) 1423 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1424 (uint8_t *) & initack_buf); 1425 if (initack_cp == NULL) { 1426 /* could not pull INIT-ACK chunk in cookie */ 1427 return (NULL); 1428 } 1429 chk_length = ntohs(initack_cp->ch.chunk_length); 1430 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1431 return (NULL); 1432 } 1433 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1434 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1435 /* 1436 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1437 * to get into the OPEN state 1438 */ 1439 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1440 /*- 1441 * Opps, this means that we somehow generated two vtag's 1442 * the same. I.e. we did: 1443 * Us Peer 1444 * <---INIT(tag=a)------ 1445 * ----INIT-ACK(tag=t)--> 1446 * ----INIT(tag=t)------> *1 1447 * <---INIT-ACK(tag=a)--- 1448 * <----CE(tag=t)------------- *2 1449 * 1450 * At point *1 we should be generating a different 1451 * tag t'. Which means we would throw away the CE and send 1452 * ours instead. Basically this is case C (throw away side). 1453 */ 1454 if (how_indx < sizeof(asoc->cookie_how)) 1455 asoc->cookie_how[how_indx] = 17; 1456 return (NULL); 1457 1458 } 1459 switch SCTP_GET_STATE 1460 (asoc) { 1461 case SCTP_STATE_COOKIE_WAIT: 1462 case SCTP_STATE_COOKIE_ECHOED: 1463 /* 1464 * INIT was sent but got a COOKIE_ECHO with the 1465 * correct tags... just accept it...but we must 1466 * process the init so that we can make sure we have 1467 * the right seq no's. 1468 */ 1469 /* First we must process the INIT !! */ 1470 retval = sctp_process_init(init_cp, stcb, net); 1471 if (retval < 0) { 1472 if (how_indx < sizeof(asoc->cookie_how)) 1473 asoc->cookie_how[how_indx] = 3; 1474 return (NULL); 1475 } 1476 /* we have already processed the INIT so no problem */ 1477 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1478 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1479 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1480 /* update current state */ 1481 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1482 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1483 else 1484 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1485 1486 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1487 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1488 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1489 stcb->sctp_ep, stcb, asoc->primary_destination); 1490 } 1491 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1492 sctp_stop_all_cookie_timers(stcb); 1493 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1494 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1495 (inp->sctp_socket->so_qlimit == 0) 1496 ) { 1497#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1498 struct socket *so; 1499 1500#endif 1501 /* 1502 * Here is where collision would go if we 1503 * did a connect() and instead got a 1504 * init/init-ack/cookie done before the 1505 * init-ack came back.. 1506 */ 1507 stcb->sctp_ep->sctp_flags |= 1508 SCTP_PCB_FLAGS_CONNECTED; 1509#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1510 so = SCTP_INP_SO(stcb->sctp_ep); 1511 atomic_add_int(&stcb->asoc.refcnt, 1); 1512 SCTP_TCB_UNLOCK(stcb); 1513 SCTP_SOCKET_LOCK(so, 1); 1514 SCTP_TCB_LOCK(stcb); 1515 atomic_add_int(&stcb->asoc.refcnt, -1); 1516 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1517 SCTP_SOCKET_UNLOCK(so, 1); 1518 return (NULL); 1519 } 1520#endif 1521 soisconnected(stcb->sctp_socket); 1522#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1523 SCTP_SOCKET_UNLOCK(so, 1); 1524#endif 1525 } 1526 /* notify upper layer */ 1527 *notification = SCTP_NOTIFY_ASSOC_UP; 1528 /* 1529 * since we did not send a HB make sure we don't 1530 * double things 1531 */ 1532 net->hb_responded = 1; 1533 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1534 &cookie->time_entered, sctp_align_unsafe_makecopy); 1535 1536 if (stcb->asoc.sctp_autoclose_ticks && 1537 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1538 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1539 inp, stcb, NULL); 1540 } 1541 break; 1542 default: 1543 /* 1544 * we're in the OPEN state (or beyond), so peer must 1545 * have simply lost the COOKIE-ACK 1546 */ 1547 break; 1548 } /* end switch */ 1549 sctp_stop_all_cookie_timers(stcb); 1550 /* 1551 * We ignore the return code here.. not sure if we should 1552 * somehow abort.. but we do have an existing asoc. This 1553 * really should not fail. 1554 */ 1555 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1556 init_offset + sizeof(struct sctp_init_chunk), 1557 initack_offset, sh, init_src)) { 1558 if (how_indx < sizeof(asoc->cookie_how)) 1559 asoc->cookie_how[how_indx] = 4; 1560 return (NULL); 1561 } 1562 /* respond with a COOKIE-ACK */ 1563 sctp_toss_old_cookies(stcb, asoc); 1564 sctp_send_cookie_ack(stcb); 1565 if (how_indx < sizeof(asoc->cookie_how)) 1566 asoc->cookie_how[how_indx] = 5; 1567 return (stcb); 1568 } 1569 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1570 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1571 cookie->tie_tag_my_vtag == 0 && 1572 cookie->tie_tag_peer_vtag == 0) { 1573 /* 1574 * case C in Section 5.2.4 Table 2: XMOO silently discard 1575 */ 1576 if (how_indx < sizeof(asoc->cookie_how)) 1577 asoc->cookie_how[how_indx] = 6; 1578 return (NULL); 1579 } 1580 /* 1581 * If nat support, and the below and stcb is established, send back 1582 * a ABORT(colliding state) if we are established. 1583 */ 1584 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1585 (asoc->peer_supports_nat) && 1586 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1588 (asoc->peer_vtag == 0)))) { 1589 /* 1590 * Special case - Peer's support nat. We may have two init's 1591 * that we gave out the same tag on since one was not 1592 * established.. i.e. we get INIT from host-1 behind the nat 1593 * and we respond tag-a, we get a INIT from host-2 behind 1594 * the nat and we get tag-a again. Then we bring up host-1 1595 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1596 * Now we have colliding state. We must send an abort here 1597 * with colliding state indication. 1598 */ 1599 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1600 0, M_DONTWAIT, 1, MT_DATA); 1601 if (op_err == NULL) { 1602 /* FOOBAR */ 1603 return (NULL); 1604 } 1605 /* pre-reserve some space */ 1606#ifdef INET6 1607 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1608#else 1609 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1610#endif 1611 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1612 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1613 /* Set the len */ 1614 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1615 ph = mtod(op_err, struct sctp_paramhdr *); 1616 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1617 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1618 sctp_send_abort(m, iphlen, sh, 0, op_err, vrf_id, port); 1619 return (NULL); 1620 } 1621 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1622 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1623 (asoc->peer_vtag == 0))) { 1624 /* 1625 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1626 * should be ok, re-accept peer info 1627 */ 1628 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1629 /* 1630 * Extension of case C. If we hit this, then the 1631 * random number generator returned the same vtag 1632 * when we first sent our INIT-ACK and when we later 1633 * sent our INIT. The side with the seq numbers that 1634 * are different will be the one that normnally 1635 * would have hit case C. This in effect "extends" 1636 * our vtags in this collision case to be 64 bits. 1637 * The same collision could occur aka you get both 1638 * vtag and seq number the same twice in a row.. but 1639 * is much less likely. If it did happen then we 1640 * would proceed through and bring up the assoc.. we 1641 * may end up with the wrong stream setup however.. 1642 * which would be bad.. but there is no way to 1643 * tell.. until we send on a stream that does not 1644 * exist :-) 1645 */ 1646 if (how_indx < sizeof(asoc->cookie_how)) 1647 asoc->cookie_how[how_indx] = 7; 1648 1649 return (NULL); 1650 } 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 8; 1653 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1654 sctp_stop_all_cookie_timers(stcb); 1655 /* 1656 * since we did not send a HB make sure we don't double 1657 * things 1658 */ 1659 net->hb_responded = 1; 1660 if (stcb->asoc.sctp_autoclose_ticks && 1661 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1662 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1663 NULL); 1664 } 1665 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1666 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1667 1668 /* Note last_cwr_tsn? where is this used? */ 1669 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1670 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1671 /* 1672 * Ok the peer probably discarded our data (if we 1673 * echoed a cookie+data). So anything on the 1674 * sent_queue should be marked for retransmit, we 1675 * may not get something to kick us so it COULD 1676 * still take a timeout to move these.. but it can't 1677 * hurt to mark them. 1678 */ 1679 struct sctp_tmit_chunk *chk; 1680 1681 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1682 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1683 chk->sent = SCTP_DATAGRAM_RESEND; 1684 sctp_flight_size_decrease(chk); 1685 sctp_total_flight_decrease(stcb, chk); 1686 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1687 spec_flag++; 1688 } 1689 } 1690 1691 } 1692 /* process the INIT info (peer's info) */ 1693 retval = sctp_process_init(init_cp, stcb, net); 1694 if (retval < 0) { 1695 if (how_indx < sizeof(asoc->cookie_how)) 1696 asoc->cookie_how[how_indx] = 9; 1697 return (NULL); 1698 } 1699 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1700 init_offset + sizeof(struct sctp_init_chunk), 1701 initack_offset, sh, init_src)) { 1702 if (how_indx < sizeof(asoc->cookie_how)) 1703 asoc->cookie_how[how_indx] = 10; 1704 return (NULL); 1705 } 1706 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1707 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1708 *notification = SCTP_NOTIFY_ASSOC_UP; 1709 1710 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1711 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1712 (inp->sctp_socket->so_qlimit == 0)) { 1713#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1714 struct socket *so; 1715 1716#endif 1717 stcb->sctp_ep->sctp_flags |= 1718 SCTP_PCB_FLAGS_CONNECTED; 1719#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1720 so = SCTP_INP_SO(stcb->sctp_ep); 1721 atomic_add_int(&stcb->asoc.refcnt, 1); 1722 SCTP_TCB_UNLOCK(stcb); 1723 SCTP_SOCKET_LOCK(so, 1); 1724 SCTP_TCB_LOCK(stcb); 1725 atomic_add_int(&stcb->asoc.refcnt, -1); 1726 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1727 SCTP_SOCKET_UNLOCK(so, 1); 1728 return (NULL); 1729 } 1730#endif 1731 soisconnected(stcb->sctp_socket); 1732#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1733 SCTP_SOCKET_UNLOCK(so, 1); 1734#endif 1735 } 1736 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1737 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1738 else 1739 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1740 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1741 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1742 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1743 } else { 1744 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1745 } 1746 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1747 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1748 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1749 stcb->sctp_ep, stcb, asoc->primary_destination); 1750 } 1751 sctp_stop_all_cookie_timers(stcb); 1752 sctp_toss_old_cookies(stcb, asoc); 1753 sctp_send_cookie_ack(stcb); 1754 if (spec_flag) { 1755 /* 1756 * only if we have retrans set do we do this. What 1757 * this call does is get only the COOKIE-ACK out and 1758 * then when we return the normal call to 1759 * sctp_chunk_output will get the retrans out behind 1760 * this. 1761 */ 1762 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1763 } 1764 if (how_indx < sizeof(asoc->cookie_how)) 1765 asoc->cookie_how[how_indx] = 11; 1766 1767 return (stcb); 1768 } 1769 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1770 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1771 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1772 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1773 cookie->tie_tag_peer_vtag != 0) { 1774 struct sctpasochead *head; 1775 1776 if (asoc->peer_supports_nat) { 1777 /* 1778 * This is a gross gross hack. just call the 1779 * cookie_new code since we are allowing a duplicate 1780 * association. I hope this works... 1781 */ 1782 return (sctp_process_cookie_new(m, iphlen, offset, sh, cookie, cookie_len, 1783 inp, netp, init_src, notification, 1784 auth_skipped, auth_offset, auth_len, 1785 vrf_id, port)); 1786 } 1787 /* 1788 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1789 */ 1790 /* temp code */ 1791 if (how_indx < sizeof(asoc->cookie_how)) 1792 asoc->cookie_how[how_indx] = 12; 1793 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1794 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1795 1796 *sac_assoc_id = sctp_get_associd(stcb); 1797 /* notify upper layer */ 1798 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1799 atomic_add_int(&stcb->asoc.refcnt, 1); 1800 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1801 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1802 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1803 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1804 } 1805 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1806 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1807 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1808 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1809 } 1810 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1811 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1812 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1813 stcb->sctp_ep, stcb, asoc->primary_destination); 1814 1815 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1816 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1817 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1818 } 1819 asoc->pre_open_streams = 1820 ntohs(initack_cp->init.num_outbound_streams); 1821 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1822 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1823 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1824 1825 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1826 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1827 1828 asoc->str_reset_seq_in = asoc->init_seq_number; 1829 1830 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1831 if (asoc->mapping_array) { 1832 memset(asoc->mapping_array, 0, 1833 asoc->mapping_array_size); 1834 } 1835 /* EY 05/13/08 - nr_sack version of the above if statement */ 1836 if (asoc->nr_mapping_array && SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) 1837 && asoc->peer_supports_nr_sack) { 1838 memset(asoc->nr_mapping_array, 0, 1839 asoc->nr_mapping_array_size); 1840 } 1841 SCTP_TCB_UNLOCK(stcb); 1842 SCTP_INP_INFO_WLOCK(); 1843 SCTP_INP_WLOCK(stcb->sctp_ep); 1844 SCTP_TCB_LOCK(stcb); 1845 atomic_add_int(&stcb->asoc.refcnt, -1); 1846 /* send up all the data */ 1847 SCTP_TCB_SEND_LOCK(stcb); 1848 1849 sctp_report_all_outbound(stcb, 1, SCTP_SO_NOT_LOCKED); 1850 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1851 stcb->asoc.strmout[i].stream_no = i; 1852 stcb->asoc.strmout[i].next_sequence_sent = 0; 1853 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1854 } 1855 /* process the INIT-ACK info (my info) */ 1856 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1857 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1858 1859 /* pull from vtag hash */ 1860 LIST_REMOVE(stcb, sctp_asocs); 1861 /* re-insert to new vtag position */ 1862 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1863 SCTP_BASE_INFO(hashasocmark))]; 1864 /* 1865 * put it in the bucket in the vtag hash of assoc's for the 1866 * system 1867 */ 1868 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1869 1870 /* process the INIT info (peer's info) */ 1871 SCTP_TCB_SEND_UNLOCK(stcb); 1872 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1873 SCTP_INP_INFO_WUNLOCK(); 1874 1875 retval = sctp_process_init(init_cp, stcb, net); 1876 if (retval < 0) { 1877 if (how_indx < sizeof(asoc->cookie_how)) 1878 asoc->cookie_how[how_indx] = 13; 1879 1880 return (NULL); 1881 } 1882 /* 1883 * since we did not send a HB make sure we don't double 1884 * things 1885 */ 1886 net->hb_responded = 1; 1887 1888 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1889 init_offset + sizeof(struct sctp_init_chunk), 1890 initack_offset, sh, init_src)) { 1891 if (how_indx < sizeof(asoc->cookie_how)) 1892 asoc->cookie_how[how_indx] = 14; 1893 1894 return (NULL); 1895 } 1896 /* respond with a COOKIE-ACK */ 1897 sctp_stop_all_cookie_timers(stcb); 1898 sctp_toss_old_cookies(stcb, asoc); 1899 sctp_send_cookie_ack(stcb); 1900 if (how_indx < sizeof(asoc->cookie_how)) 1901 asoc->cookie_how[how_indx] = 15; 1902 1903 return (stcb); 1904 } 1905 if (how_indx < sizeof(asoc->cookie_how)) 1906 asoc->cookie_how[how_indx] = 16; 1907 /* all other cases... */ 1908 return (NULL); 1909} 1910 1911 1912/* 1913 * handle a state cookie for a new association m: input packet mbuf chain-- 1914 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1915 * and the cookie signature does not exist offset: offset into mbuf to the 1916 * cookie-echo chunk length: length of the cookie chunk to: where the init 1917 * was from returns a new TCB 1918 */ 1919struct sctp_tcb * 1920sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1921 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1922 struct sctp_inpcb *inp, struct sctp_nets **netp, 1923 struct sockaddr *init_src, int *notification, 1924 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1925 uint32_t vrf_id, uint16_t port) 1926{ 1927 struct sctp_tcb *stcb; 1928 struct sctp_init_chunk *init_cp, init_buf; 1929 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1930 struct sockaddr_storage sa_store; 1931 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1932 struct sockaddr_in *sin; 1933 struct sockaddr_in6 *sin6; 1934 struct sctp_association *asoc; 1935 int chk_length; 1936 int init_offset, initack_offset, initack_limit; 1937 int retval; 1938 int error = 0; 1939 uint32_t old_tag; 1940 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1941 1942#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1943 struct socket *so; 1944 1945 so = SCTP_INP_SO(inp); 1946#endif 1947 1948 /* 1949 * find and validate the INIT chunk in the cookie (peer's info) the 1950 * INIT should start after the cookie-echo header struct (chunk 1951 * header, state cookie header struct) 1952 */ 1953 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1954 init_cp = (struct sctp_init_chunk *) 1955 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1956 (uint8_t *) & init_buf); 1957 if (init_cp == NULL) { 1958 /* could not pull a INIT chunk in cookie */ 1959 SCTPDBG(SCTP_DEBUG_INPUT1, 1960 "process_cookie_new: could not pull INIT chunk hdr\n"); 1961 return (NULL); 1962 } 1963 chk_length = ntohs(init_cp->ch.chunk_length); 1964 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1965 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1966 return (NULL); 1967 } 1968 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1969 /* 1970 * find and validate the INIT-ACK chunk in the cookie (my info) the 1971 * INIT-ACK follows the INIT chunk 1972 */ 1973 initack_cp = (struct sctp_init_ack_chunk *) 1974 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1975 (uint8_t *) & initack_buf); 1976 if (initack_cp == NULL) { 1977 /* could not pull INIT-ACK chunk in cookie */ 1978 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1979 return (NULL); 1980 } 1981 chk_length = ntohs(initack_cp->ch.chunk_length); 1982 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1983 return (NULL); 1984 } 1985 /* 1986 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1987 * "initack_limit" value. This is because the chk_length field 1988 * includes the length of the cookie, but the cookie is omitted when 1989 * the INIT and INIT_ACK are tacked onto the cookie... 1990 */ 1991 initack_limit = offset + cookie_len; 1992 1993 /* 1994 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1995 * and popluate 1996 */ 1997 1998 /* 1999 * Here we do a trick, we set in NULL for the proc/thread argument. 2000 * We do this since in effect we only use the p argument when the 2001 * socket is unbound and we must do an implicit bind. Since we are 2002 * getting a cookie, we cannot be unbound. 2003 */ 2004 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 2005 ntohl(initack_cp->init.initiate_tag), vrf_id, 2006 (struct thread *)NULL 2007 ); 2008 if (stcb == NULL) { 2009 struct mbuf *op_err; 2010 2011 /* memory problem? */ 2012 SCTPDBG(SCTP_DEBUG_INPUT1, 2013 "process_cookie_new: no room for another TCB!\n"); 2014 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2015 2016 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2017 sh, op_err, vrf_id, port); 2018 return (NULL); 2019 } 2020 /* get the correct sctp_nets */ 2021 if (netp) 2022 *netp = sctp_findnet(stcb, init_src); 2023 2024 asoc = &stcb->asoc; 2025 /* get scope variables out of cookie */ 2026 asoc->ipv4_local_scope = cookie->ipv4_scope; 2027 asoc->site_scope = cookie->site_scope; 2028 asoc->local_scope = cookie->local_scope; 2029 asoc->loopback_scope = cookie->loopback_scope; 2030 2031 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2032 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2033 struct mbuf *op_err; 2034 2035 /* 2036 * Houston we have a problem. The EP changed while the 2037 * cookie was in flight. Only recourse is to abort the 2038 * association. 2039 */ 2040 atomic_add_int(&stcb->asoc.refcnt, 1); 2041 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2042 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2043 sh, op_err, vrf_id, port); 2044#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2045 SCTP_TCB_UNLOCK(stcb); 2046 SCTP_SOCKET_LOCK(so, 1); 2047 SCTP_TCB_LOCK(stcb); 2048#endif 2049 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2050 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2051#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2052 SCTP_SOCKET_UNLOCK(so, 1); 2053#endif 2054 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2055 return (NULL); 2056 } 2057 /* process the INIT-ACK info (my info) */ 2058 old_tag = asoc->my_vtag; 2059 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2060 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2061 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2062 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2063 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2064 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2065 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 2066 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2067 asoc->str_reset_seq_in = asoc->init_seq_number; 2068 2069 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2070 2071 /* process the INIT info (peer's info) */ 2072 if (netp) 2073 retval = sctp_process_init(init_cp, stcb, *netp); 2074 else 2075 retval = 0; 2076 if (retval < 0) { 2077 atomic_add_int(&stcb->asoc.refcnt, 1); 2078#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2079 SCTP_TCB_UNLOCK(stcb); 2080 SCTP_SOCKET_LOCK(so, 1); 2081 SCTP_TCB_LOCK(stcb); 2082#endif 2083 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2084#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2085 SCTP_SOCKET_UNLOCK(so, 1); 2086#endif 2087 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2088 return (NULL); 2089 } 2090 /* load all addresses */ 2091 if (sctp_load_addresses_from_init(stcb, m, iphlen, 2092 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 2093 init_src)) { 2094 atomic_add_int(&stcb->asoc.refcnt, 1); 2095#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2096 SCTP_TCB_UNLOCK(stcb); 2097 SCTP_SOCKET_LOCK(so, 1); 2098 SCTP_TCB_LOCK(stcb); 2099#endif 2100 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2101#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2102 SCTP_SOCKET_UNLOCK(so, 1); 2103#endif 2104 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2105 return (NULL); 2106 } 2107 /* 2108 * verify any preceding AUTH chunk that was skipped 2109 */ 2110 /* pull the local authentication parameters from the cookie/init-ack */ 2111 sctp_auth_get_cookie_params(stcb, m, 2112 initack_offset + sizeof(struct sctp_init_ack_chunk), 2113 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2114 if (auth_skipped) { 2115 struct sctp_auth_chunk *auth; 2116 2117 auth = (struct sctp_auth_chunk *) 2118 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2119 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2120 /* auth HMAC failed, dump the assoc and packet */ 2121 SCTPDBG(SCTP_DEBUG_AUTH1, 2122 "COOKIE-ECHO: AUTH failed\n"); 2123 atomic_add_int(&stcb->asoc.refcnt, 1); 2124#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2125 SCTP_TCB_UNLOCK(stcb); 2126 SCTP_SOCKET_LOCK(so, 1); 2127 SCTP_TCB_LOCK(stcb); 2128#endif 2129 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2130#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2131 SCTP_SOCKET_UNLOCK(so, 1); 2132#endif 2133 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2134 return (NULL); 2135 } else { 2136 /* remaining chunks checked... good to go */ 2137 stcb->asoc.authenticated = 1; 2138 } 2139 } 2140 /* update current state */ 2141 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2142 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2143 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2144 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2145 stcb->sctp_ep, stcb, asoc->primary_destination); 2146 } 2147 sctp_stop_all_cookie_timers(stcb); 2148 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2149 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2150 2151 /* 2152 * if we're doing ASCONFs, check to see if we have any new local 2153 * addresses that need to get added to the peer (eg. addresses 2154 * changed while cookie echo in flight). This needs to be done 2155 * after we go to the OPEN state to do the correct asconf 2156 * processing. else, make sure we have the correct addresses in our 2157 * lists 2158 */ 2159 2160 /* warning, we re-use sin, sin6, sa_store here! */ 2161 /* pull in local_address (our "from" address) */ 2162 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 2163 /* source addr is IPv4 */ 2164 sin = (struct sockaddr_in *)initack_src; 2165 memset(sin, 0, sizeof(*sin)); 2166 sin->sin_family = AF_INET; 2167 sin->sin_len = sizeof(struct sockaddr_in); 2168 sin->sin_addr.s_addr = cookie->laddress[0]; 2169 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 2170 /* source addr is IPv6 */ 2171 sin6 = (struct sockaddr_in6 *)initack_src; 2172 memset(sin6, 0, sizeof(*sin6)); 2173 sin6->sin6_family = AF_INET6; 2174 sin6->sin6_len = sizeof(struct sockaddr_in6); 2175 sin6->sin6_scope_id = cookie->scope_id; 2176 memcpy(&sin6->sin6_addr, cookie->laddress, 2177 sizeof(sin6->sin6_addr)); 2178 } else { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184#endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2186#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188#endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 2193 /* set up to notify upper layer */ 2194 *notification = SCTP_NOTIFY_ASSOC_UP; 2195 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2196 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2197 (inp->sctp_socket->so_qlimit == 0)) { 2198 /* 2199 * This is an endpoint that called connect() how it got a 2200 * cookie that is NEW is a bit of a mystery. It must be that 2201 * the INIT was sent, but before it got there.. a complete 2202 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2203 * should have went to the other code.. not here.. oh well.. 2204 * a bit of protection is worth having.. 2205 */ 2206 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2207#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209 SCTP_TCB_UNLOCK(stcb); 2210 SCTP_SOCKET_LOCK(so, 1); 2211 SCTP_TCB_LOCK(stcb); 2212 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2213 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2214 SCTP_SOCKET_UNLOCK(so, 1); 2215 return (NULL); 2216 } 2217#endif 2218 soisconnected(stcb->sctp_socket); 2219#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2220 SCTP_SOCKET_UNLOCK(so, 1); 2221#endif 2222 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2223 (inp->sctp_socket->so_qlimit)) { 2224 /* 2225 * We don't want to do anything with this one. Since it is 2226 * the listening guy. The timer will get started for 2227 * accepted connections in the caller. 2228 */ 2229 ; 2230 } 2231 /* since we did not send a HB make sure we don't double things */ 2232 if ((netp) && (*netp)) 2233 (*netp)->hb_responded = 1; 2234 2235 if (stcb->asoc.sctp_autoclose_ticks && 2236 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2237 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2238 } 2239 /* calculate the RTT */ 2240 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2241 if ((netp) && (*netp)) { 2242 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2243 &cookie->time_entered, sctp_align_unsafe_makecopy); 2244 } 2245 /* respond with a COOKIE-ACK */ 2246 sctp_send_cookie_ack(stcb); 2247 2248 /* 2249 * check the address lists for any ASCONFs that need to be sent 2250 * AFTER the cookie-ack is sent 2251 */ 2252 sctp_check_address_list(stcb, m, 2253 initack_offset + sizeof(struct sctp_init_ack_chunk), 2254 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2255 initack_src, cookie->local_scope, cookie->site_scope, 2256 cookie->ipv4_scope, cookie->loopback_scope); 2257 2258 2259 return (stcb); 2260} 2261 2262/* 2263 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2264 * we NEED to make sure we are not already using the vtag. If so we 2265 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2266 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2267 SCTP_BASE_INFO(hashasocmark))]; 2268 LIST_FOREACH(stcb, head, sctp_asocs) { 2269 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2270 -- SEND ABORT - TRY AGAIN -- 2271 } 2272 } 2273*/ 2274 2275/* 2276 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2277 * existing (non-NULL) TCB 2278 */ 2279static struct mbuf * 2280sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2281 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2282 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2283 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2284 struct sctp_tcb **locked_tcb, uint32_t vrf_id, uint16_t port) 2285{ 2286 struct sctp_state_cookie *cookie; 2287 struct sockaddr_in6 sin6; 2288 struct sockaddr_in sin; 2289 struct sctp_tcb *l_stcb = *stcb; 2290 struct sctp_inpcb *l_inp; 2291 struct sockaddr *to; 2292 sctp_assoc_t sac_restart_id; 2293 struct sctp_pcb *ep; 2294 struct mbuf *m_sig; 2295 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2296 uint8_t *sig; 2297 uint8_t cookie_ok = 0; 2298 unsigned int size_of_pkt, sig_offset, cookie_offset; 2299 unsigned int cookie_len; 2300 struct timeval now; 2301 struct timeval time_expires; 2302 struct sockaddr_storage dest_store; 2303 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 2304 struct ip *iph; 2305 int notification = 0; 2306 struct sctp_nets *netl; 2307 int had_a_existing_tcb = 0; 2308 2309 SCTPDBG(SCTP_DEBUG_INPUT2, 2310 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2311 2312 if (inp_p == NULL) { 2313 return (NULL); 2314 } 2315 /* First get the destination address setup too. */ 2316 iph = mtod(m, struct ip *); 2317 switch (iph->ip_v) { 2318 case IPVERSION: 2319 { 2320 /* its IPv4 */ 2321 struct sockaddr_in *lsin; 2322 2323 lsin = (struct sockaddr_in *)(localep_sa); 2324 memset(lsin, 0, sizeof(*lsin)); 2325 lsin->sin_family = AF_INET; 2326 lsin->sin_len = sizeof(*lsin); 2327 lsin->sin_port = sh->dest_port; 2328 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 2329 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 2330 break; 2331 } 2332#ifdef INET6 2333 case IPV6_VERSION >> 4: 2334 { 2335 /* its IPv6 */ 2336 struct ip6_hdr *ip6; 2337 struct sockaddr_in6 *lsin6; 2338 2339 lsin6 = (struct sockaddr_in6 *)(localep_sa); 2340 memset(lsin6, 0, sizeof(*lsin6)); 2341 lsin6->sin6_family = AF_INET6; 2342 lsin6->sin6_len = sizeof(struct sockaddr_in6); 2343 ip6 = mtod(m, struct ip6_hdr *); 2344 lsin6->sin6_port = sh->dest_port; 2345 lsin6->sin6_addr = ip6->ip6_dst; 2346 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 2347 break; 2348 } 2349#endif 2350 default: 2351 return (NULL); 2352 } 2353 2354 cookie = &cp->cookie; 2355 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2356 cookie_len = ntohs(cp->ch.chunk_length); 2357 2358 if ((cookie->peerport != sh->src_port) && 2359 (cookie->myport != sh->dest_port) && 2360 (cookie->my_vtag != sh->v_tag)) { 2361 /* 2362 * invalid ports or bad tag. Note that we always leave the 2363 * v_tag in the header in network order and when we stored 2364 * it in the my_vtag slot we also left it in network order. 2365 * This maintains the match even though it may be in the 2366 * opposite byte order of the machine :-> 2367 */ 2368 return (NULL); 2369 } 2370 if (cookie_len > size_of_pkt || 2371 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2372 sizeof(struct sctp_init_chunk) + 2373 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2374 /* cookie too long! or too small */ 2375 return (NULL); 2376 } 2377 /* 2378 * split off the signature into its own mbuf (since it should not be 2379 * calculated in the sctp_hmac_m() call). 2380 */ 2381 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2382 if (sig_offset > size_of_pkt) { 2383 /* packet not correct size! */ 2384 /* XXX this may already be accounted for earlier... */ 2385 return (NULL); 2386 } 2387 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2388 if (m_sig == NULL) { 2389 /* out of memory or ?? */ 2390 return (NULL); 2391 } 2392#ifdef SCTP_MBUF_LOGGING 2393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2394 struct mbuf *mat; 2395 2396 mat = m_sig; 2397 while (mat) { 2398 if (SCTP_BUF_IS_EXTENDED(mat)) { 2399 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2400 } 2401 mat = SCTP_BUF_NEXT(mat); 2402 } 2403 } 2404#endif 2405 2406 /* 2407 * compute the signature/digest for the cookie 2408 */ 2409 ep = &(*inp_p)->sctp_ep; 2410 l_inp = *inp_p; 2411 if (l_stcb) { 2412 SCTP_TCB_UNLOCK(l_stcb); 2413 } 2414 SCTP_INP_RLOCK(l_inp); 2415 if (l_stcb) { 2416 SCTP_TCB_LOCK(l_stcb); 2417 } 2418 /* which cookie is it? */ 2419 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2420 (ep->current_secret_number != ep->last_secret_number)) { 2421 /* it's the old cookie */ 2422 (void)sctp_hmac_m(SCTP_HMAC, 2423 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2424 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2425 } else { 2426 /* it's the current cookie */ 2427 (void)sctp_hmac_m(SCTP_HMAC, 2428 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2429 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2430 } 2431 /* get the signature */ 2432 SCTP_INP_RUNLOCK(l_inp); 2433 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2434 if (sig == NULL) { 2435 /* couldn't find signature */ 2436 sctp_m_freem(m_sig); 2437 return (NULL); 2438 } 2439 /* compare the received digest with the computed digest */ 2440 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2441 /* try the old cookie? */ 2442 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2443 (ep->current_secret_number != ep->last_secret_number)) { 2444 /* compute digest with old */ 2445 (void)sctp_hmac_m(SCTP_HMAC, 2446 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2447 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2448 /* compare */ 2449 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2450 cookie_ok = 1; 2451 } 2452 } else { 2453 cookie_ok = 1; 2454 } 2455 2456 /* 2457 * Now before we continue we must reconstruct our mbuf so that 2458 * normal processing of any other chunks will work. 2459 */ 2460 { 2461 struct mbuf *m_at; 2462 2463 m_at = m; 2464 while (SCTP_BUF_NEXT(m_at) != NULL) { 2465 m_at = SCTP_BUF_NEXT(m_at); 2466 } 2467 SCTP_BUF_NEXT(m_at) = m_sig; 2468 } 2469 2470 if (cookie_ok == 0) { 2471 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2472 SCTPDBG(SCTP_DEBUG_INPUT2, 2473 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2474 (uint32_t) offset, cookie_offset, sig_offset); 2475 return (NULL); 2476 } 2477 /* 2478 * check the cookie timestamps to be sure it's not stale 2479 */ 2480 (void)SCTP_GETTIME_TIMEVAL(&now); 2481 /* Expire time is in Ticks, so we convert to seconds */ 2482 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2483 time_expires.tv_usec = cookie->time_entered.tv_usec; 2484 /* 2485 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2486 * is undefined. 2487 */ 2488 if (timevalcmp(&now, &time_expires, >)) { 2489 /* cookie is stale! */ 2490 struct mbuf *op_err; 2491 struct sctp_stale_cookie_msg *scm; 2492 uint32_t tim; 2493 2494 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2495 0, M_DONTWAIT, 1, MT_DATA); 2496 if (op_err == NULL) { 2497 /* FOOBAR */ 2498 return (NULL); 2499 } 2500 /* Set the len */ 2501 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2502 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2503 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2504 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2505 (sizeof(uint32_t)))); 2506 /* seconds to usec */ 2507 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2508 /* add in usec */ 2509 if (tim == 0) 2510 tim = now.tv_usec - cookie->time_entered.tv_usec; 2511 scm->time_usec = htonl(tim); 2512 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2513 vrf_id, port); 2514 return (NULL); 2515 } 2516 /* 2517 * Now we must see with the lookup address if we have an existing 2518 * asoc. This will only happen if we were in the COOKIE-WAIT state 2519 * and a INIT collided with us and somewhere the peer sent the 2520 * cookie on another address besides the single address our assoc 2521 * had for him. In this case we will have one of the tie-tags set at 2522 * least AND the address field in the cookie can be used to look it 2523 * up. 2524 */ 2525 to = NULL; 2526 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2527 memset(&sin6, 0, sizeof(sin6)); 2528 sin6.sin6_family = AF_INET6; 2529 sin6.sin6_len = sizeof(sin6); 2530 sin6.sin6_port = sh->src_port; 2531 sin6.sin6_scope_id = cookie->scope_id; 2532 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2533 sizeof(sin6.sin6_addr.s6_addr)); 2534 to = (struct sockaddr *)&sin6; 2535 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2536 memset(&sin, 0, sizeof(sin)); 2537 sin.sin_family = AF_INET; 2538 sin.sin_len = sizeof(sin); 2539 sin.sin_port = sh->src_port; 2540 sin.sin_addr.s_addr = cookie->address[0]; 2541 to = (struct sockaddr *)&sin; 2542 } else { 2543 /* This should not happen */ 2544 return (NULL); 2545 } 2546 if ((*stcb == NULL) && to) { 2547 /* Yep, lets check */ 2548 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2549 if (*stcb == NULL) { 2550 /* 2551 * We should have only got back the same inp. If we 2552 * got back a different ep we have a problem. The 2553 * original findep got back l_inp and now 2554 */ 2555 if (l_inp != *inp_p) { 2556 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2557 } 2558 } else { 2559 if (*locked_tcb == NULL) { 2560 /* 2561 * In this case we found the assoc only 2562 * after we locked the create lock. This 2563 * means we are in a colliding case and we 2564 * must make sure that we unlock the tcb if 2565 * its one of the cases where we throw away 2566 * the incoming packets. 2567 */ 2568 *locked_tcb = *stcb; 2569 2570 /* 2571 * We must also increment the inp ref count 2572 * since the ref_count flags was set when we 2573 * did not find the TCB, now we found it 2574 * which reduces the refcount.. we must 2575 * raise it back out to balance it all :-) 2576 */ 2577 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2578 if ((*stcb)->sctp_ep != l_inp) { 2579 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2580 (*stcb)->sctp_ep, l_inp); 2581 } 2582 } 2583 } 2584 } 2585 if (to == NULL) { 2586 return (NULL); 2587 } 2588 cookie_len -= SCTP_SIGNATURE_SIZE; 2589 if (*stcb == NULL) { 2590 /* this is the "normal" case... get a new TCB */ 2591 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2592 cookie_len, *inp_p, netp, to, ¬ification, 2593 auth_skipped, auth_offset, auth_len, vrf_id, port); 2594 } else { 2595 /* this is abnormal... cookie-echo on existing TCB */ 2596 had_a_existing_tcb = 1; 2597 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2598 cookie, cookie_len, *inp_p, *stcb, netp, to, 2599 ¬ification, &sac_restart_id, vrf_id, auth_skipped, auth_offset, auth_len, port); 2600 } 2601 2602 if (*stcb == NULL) { 2603 /* still no TCB... must be bad cookie-echo */ 2604 return (NULL); 2605 } 2606 /* 2607 * Ok, we built an association so confirm the address we sent the 2608 * INIT-ACK to. 2609 */ 2610 netl = sctp_findnet(*stcb, to); 2611 /* 2612 * This code should in theory NOT run but 2613 */ 2614 if (netl == NULL) { 2615 /* TSNH! Huh, why do I need to add this address here? */ 2616 int ret; 2617 2618 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2619 SCTP_IN_COOKIE_PROC); 2620 netl = sctp_findnet(*stcb, to); 2621 } 2622 if (netl) { 2623 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2624 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2625 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2626 netl); 2627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2628 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2629 } 2630 } 2631 if (*stcb) { 2632 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2633 *stcb, NULL); 2634 } 2635 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2636 if (!had_a_existing_tcb || 2637 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2638 /* 2639 * If we have a NEW cookie or the connect never 2640 * reached the connected state during collision we 2641 * must do the TCP accept thing. 2642 */ 2643 struct socket *so, *oso; 2644 struct sctp_inpcb *inp; 2645 2646 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2647 /* 2648 * For a restart we will keep the same 2649 * socket, no need to do anything. I THINK!! 2650 */ 2651 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id, SCTP_SO_NOT_LOCKED); 2652 return (m); 2653 } 2654 oso = (*inp_p)->sctp_socket; 2655 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2656 SCTP_TCB_UNLOCK((*stcb)); 2657 so = sonewconn(oso, 0 2658 ); 2659 SCTP_TCB_LOCK((*stcb)); 2660 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2661 2662 if (so == NULL) { 2663 struct mbuf *op_err; 2664 2665#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2666 struct socket *pcb_so; 2667 2668#endif 2669 /* Too many sockets */ 2670 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2671 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2672 sctp_abort_association(*inp_p, NULL, m, iphlen, 2673 sh, op_err, vrf_id, port); 2674#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2675 pcb_so = SCTP_INP_SO(*inp_p); 2676 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2677 SCTP_TCB_UNLOCK((*stcb)); 2678 SCTP_SOCKET_LOCK(pcb_so, 1); 2679 SCTP_TCB_LOCK((*stcb)); 2680 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2681#endif 2682 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2683#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2684 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2685#endif 2686 return (NULL); 2687 } 2688 inp = (struct sctp_inpcb *)so->so_pcb; 2689 SCTP_INP_INCR_REF(inp); 2690 /* 2691 * We add the unbound flag here so that if we get an 2692 * soabort() before we get the move_pcb done, we 2693 * will properly cleanup. 2694 */ 2695 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2696 SCTP_PCB_FLAGS_CONNECTED | 2697 SCTP_PCB_FLAGS_IN_TCPPOOL | 2698 SCTP_PCB_FLAGS_UNBOUND | 2699 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2700 SCTP_PCB_FLAGS_DONT_WAKE); 2701 inp->sctp_features = (*inp_p)->sctp_features; 2702 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2703 inp->sctp_socket = so; 2704 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2705 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2706 inp->sctp_context = (*inp_p)->sctp_context; 2707 inp->inp_starting_point_for_iterator = NULL; 2708 /* 2709 * copy in the authentication parameters from the 2710 * original endpoint 2711 */ 2712 if (inp->sctp_ep.local_hmacs) 2713 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2714 inp->sctp_ep.local_hmacs = 2715 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2716 if (inp->sctp_ep.local_auth_chunks) 2717 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2718 inp->sctp_ep.local_auth_chunks = 2719 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2720 2721 /* 2722 * Now we must move it from one hash table to 2723 * another and get the tcb in the right place. 2724 */ 2725 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2726 2727 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2728 SCTP_TCB_UNLOCK((*stcb)); 2729 2730 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2731 0); 2732 SCTP_TCB_LOCK((*stcb)); 2733 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2734 2735 2736 /* 2737 * now we must check to see if we were aborted while 2738 * the move was going on and the lock/unlock 2739 * happened. 2740 */ 2741 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2742 /* 2743 * yep it was, we leave the assoc attached 2744 * to the socket since the sctp_inpcb_free() 2745 * call will send an abort for us. 2746 */ 2747 SCTP_INP_DECR_REF(inp); 2748 return (NULL); 2749 } 2750 SCTP_INP_DECR_REF(inp); 2751 /* Switch over to the new guy */ 2752 *inp_p = inp; 2753 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2754 2755 /* 2756 * Pull it from the incomplete queue and wake the 2757 * guy 2758 */ 2759#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 SCTP_SOCKET_LOCK(so, 1); 2763#endif 2764 soisconnected(so); 2765#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2766 SCTP_TCB_LOCK((*stcb)); 2767 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2768 SCTP_SOCKET_UNLOCK(so, 1); 2769#endif 2770 return (m); 2771 } 2772 } 2773 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2774 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2775 } 2776 return (m); 2777} 2778 2779static void 2780sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2781 struct sctp_tcb *stcb, struct sctp_nets *net) 2782{ 2783 /* cp must not be used, others call this without a c-ack :-) */ 2784 struct sctp_association *asoc; 2785 2786 SCTPDBG(SCTP_DEBUG_INPUT2, 2787 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2788 if (stcb == NULL) 2789 return; 2790 2791 asoc = &stcb->asoc; 2792 2793 sctp_stop_all_cookie_timers(stcb); 2794 /* process according to association state */ 2795 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2796 /* state change only needed when I am in right state */ 2797 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2798 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2799 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2800 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2801 stcb->sctp_ep, stcb, asoc->primary_destination); 2802 2803 } 2804 /* update RTO */ 2805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2806 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2807 if (asoc->overall_error_count == 0) { 2808 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2809 &asoc->time_entered, sctp_align_safe_nocopy); 2810 } 2811 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2812 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2813 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2814 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2815#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2816 struct socket *so; 2817 2818#endif 2819 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2820#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2821 so = SCTP_INP_SO(stcb->sctp_ep); 2822 atomic_add_int(&stcb->asoc.refcnt, 1); 2823 SCTP_TCB_UNLOCK(stcb); 2824 SCTP_SOCKET_LOCK(so, 1); 2825 SCTP_TCB_LOCK(stcb); 2826 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2827 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2828 SCTP_SOCKET_UNLOCK(so, 1); 2829 return; 2830 } 2831#endif 2832 soisconnected(stcb->sctp_socket); 2833#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2834 SCTP_SOCKET_UNLOCK(so, 1); 2835#endif 2836 } 2837 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2838 stcb, net); 2839 /* 2840 * since we did not send a HB make sure we don't double 2841 * things 2842 */ 2843 net->hb_responded = 1; 2844 2845 if (stcb->asoc.sctp_autoclose_ticks && 2846 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2847 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2848 stcb->sctp_ep, stcb, NULL); 2849 } 2850 /* 2851 * send ASCONF if parameters are pending and ASCONFs are 2852 * allowed (eg. addresses changed when init/cookie echo were 2853 * in flight) 2854 */ 2855 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2856 (stcb->asoc.peer_supports_asconf) && 2857 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2858#ifdef SCTP_TIMER_BASED_ASCONF 2859 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2860 stcb->sctp_ep, stcb, 2861 stcb->asoc.primary_destination); 2862#else 2863 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2864 SCTP_ADDR_NOT_LOCKED); 2865#endif 2866 } 2867 } 2868 /* Toss the cookie if I can */ 2869 sctp_toss_old_cookies(stcb, asoc); 2870 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2871 /* Restart the timer if we have pending data */ 2872 struct sctp_tmit_chunk *chk; 2873 2874 chk = TAILQ_FIRST(&asoc->sent_queue); 2875 if (chk) { 2876 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2877 stcb, chk->whoTo); 2878 } 2879 } 2880} 2881 2882static void 2883sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2884 struct sctp_tcb *stcb) 2885{ 2886 struct sctp_nets *net; 2887 struct sctp_tmit_chunk *lchk; 2888 uint32_t tsn; 2889 2890 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2891 return; 2892 } 2893 SCTP_STAT_INCR(sctps_recvecne); 2894 tsn = ntohl(cp->tsn); 2895 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2896 /* Also we make sure we disable the nonce_wait */ 2897 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2898 if (lchk == NULL) { 2899 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2900 } else { 2901 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2902 } 2903 stcb->asoc.nonce_wait_for_ecne = 0; 2904 stcb->asoc.nonce_sum_check = 0; 2905 2906 /* Find where it was sent, if possible */ 2907 net = NULL; 2908 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2909 while (lchk) { 2910 if (lchk->rec.data.TSN_seq == tsn) { 2911 net = lchk->whoTo; 2912 break; 2913 } 2914 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2915 break; 2916 lchk = TAILQ_NEXT(lchk, sctp_next); 2917 } 2918 if (net == NULL) 2919 /* default is we use the primary */ 2920 net = stcb->asoc.primary_destination; 2921 2922 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2923 /* 2924 * JRS - Use the congestion control given in the pluggable 2925 * CC module 2926 */ 2927 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2928 /* 2929 * we reduce once every RTT. So we will only lower cwnd at 2930 * the next sending seq i.e. the resync_tsn. 2931 */ 2932 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2933 } 2934 /* 2935 * We always send a CWR this way if our previous one was lost our 2936 * peer will get an update, or if it is not time again to reduce we 2937 * still get the cwr to the peer. 2938 */ 2939 sctp_send_cwr(stcb, net, tsn); 2940} 2941 2942static void 2943sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2944{ 2945 /* 2946 * Here we get a CWR from the peer. We must look in the outqueue and 2947 * make sure that we have a covered ECNE in teh control chunk part. 2948 * If so remove it. 2949 */ 2950 struct sctp_tmit_chunk *chk; 2951 struct sctp_ecne_chunk *ecne; 2952 2953 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2954 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2955 continue; 2956 } 2957 /* 2958 * Look for and remove if it is the right TSN. Since there 2959 * is only ONE ECNE on the control queue at any one time we 2960 * don't need to worry about more than one! 2961 */ 2962 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2963 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2964 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2965 /* this covers this ECNE, we can remove it */ 2966 stcb->asoc.ecn_echo_cnt_onq--; 2967 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2968 sctp_next); 2969 if (chk->data) { 2970 sctp_m_freem(chk->data); 2971 chk->data = NULL; 2972 } 2973 stcb->asoc.ctrl_queue_cnt--; 2974 sctp_free_a_chunk(stcb, chk); 2975 break; 2976 } 2977 } 2978} 2979 2980static void 2981sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2982 struct sctp_tcb *stcb, struct sctp_nets *net) 2983{ 2984 struct sctp_association *asoc; 2985 2986#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2987 struct socket *so; 2988 2989#endif 2990 2991 SCTPDBG(SCTP_DEBUG_INPUT2, 2992 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2993 if (stcb == NULL) 2994 return; 2995 2996 asoc = &stcb->asoc; 2997 /* process according to association state */ 2998 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2999 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3000 SCTPDBG(SCTP_DEBUG_INPUT2, 3001 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3002 SCTP_TCB_UNLOCK(stcb); 3003 return; 3004 } 3005 /* notify upper layer protocol */ 3006 if (stcb->sctp_socket) { 3007 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3008 /* are the queues empty? they should be */ 3009 if (!TAILQ_EMPTY(&asoc->send_queue) || 3010 !TAILQ_EMPTY(&asoc->sent_queue) || 3011 !TAILQ_EMPTY(&asoc->out_wheel)) { 3012 sctp_report_all_outbound(stcb, 0, SCTP_SO_NOT_LOCKED); 3013 } 3014 } 3015 /* stop the timer */ 3016 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3017 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3018 /* free the TCB */ 3019 SCTPDBG(SCTP_DEBUG_INPUT2, 3020 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3021#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3022 so = SCTP_INP_SO(stcb->sctp_ep); 3023 atomic_add_int(&stcb->asoc.refcnt, 1); 3024 SCTP_TCB_UNLOCK(stcb); 3025 SCTP_SOCKET_LOCK(so, 1); 3026 SCTP_TCB_LOCK(stcb); 3027 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3028#endif 3029 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3030#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3031 SCTP_SOCKET_UNLOCK(so, 1); 3032#endif 3033 return; 3034} 3035 3036static int 3037process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3038 struct sctp_nets *net, uint8_t flg) 3039{ 3040 switch (desc->chunk_type) { 3041 case SCTP_DATA: 3042 /* find the tsn to resend (possibly */ 3043 { 3044 uint32_t tsn; 3045 struct sctp_tmit_chunk *tp1; 3046 3047 tsn = ntohl(desc->tsn_ifany); 3048 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3049 while (tp1) { 3050 if (tp1->rec.data.TSN_seq == tsn) { 3051 /* found it */ 3052 break; 3053 } 3054 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 3055 MAX_TSN)) { 3056 /* not found */ 3057 tp1 = NULL; 3058 break; 3059 } 3060 tp1 = TAILQ_NEXT(tp1, sctp_next); 3061 } 3062 if (tp1 == NULL) { 3063 /* 3064 * Do it the other way , aka without paying 3065 * attention to queue seq order. 3066 */ 3067 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3068 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 3069 while (tp1) { 3070 if (tp1->rec.data.TSN_seq == tsn) { 3071 /* found it */ 3072 break; 3073 } 3074 tp1 = TAILQ_NEXT(tp1, sctp_next); 3075 } 3076 } 3077 if (tp1 == NULL) { 3078 SCTP_STAT_INCR(sctps_pdrptsnnf); 3079 } 3080 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3081 uint8_t *ddp; 3082 3083 if ((stcb->asoc.peers_rwnd == 0) && 3084 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3085 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3086 return (0); 3087 } 3088 if (stcb->asoc.peers_rwnd == 0 && 3089 (flg & SCTP_FROM_MIDDLE_BOX)) { 3090 SCTP_STAT_INCR(sctps_pdrpdizrw); 3091 return (0); 3092 } 3093 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3094 sizeof(struct sctp_data_chunk)); 3095 { 3096 unsigned int iii; 3097 3098 for (iii = 0; iii < sizeof(desc->data_bytes); 3099 iii++) { 3100 if (ddp[iii] != desc->data_bytes[iii]) { 3101 SCTP_STAT_INCR(sctps_pdrpbadd); 3102 return (-1); 3103 } 3104 } 3105 } 3106 /* 3107 * We zero out the nonce so resync not 3108 * needed 3109 */ 3110 tp1->rec.data.ect_nonce = 0; 3111 3112 if (tp1->do_rtt) { 3113 /* 3114 * this guy had a RTO calculation 3115 * pending on it, cancel it 3116 */ 3117 tp1->do_rtt = 0; 3118 } 3119 SCTP_STAT_INCR(sctps_pdrpmark); 3120 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3121 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3122 tp1->sent = SCTP_DATAGRAM_RESEND; 3123 /* 3124 * mark it as if we were doing a FR, since 3125 * we will be getting gap ack reports behind 3126 * the info from the router. 3127 */ 3128 tp1->rec.data.doing_fast_retransmit = 1; 3129 /* 3130 * mark the tsn with what sequences can 3131 * cause a new FR. 3132 */ 3133 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3134 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3135 } else { 3136 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3137 } 3138 3139 /* restart the timer */ 3140 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3141 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3142 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3143 stcb, tp1->whoTo); 3144 3145 /* fix counts and things */ 3146 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3147 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3148 tp1->whoTo->flight_size, 3149 tp1->book_size, 3150 (uintptr_t) stcb, 3151 tp1->rec.data.TSN_seq); 3152 } 3153 sctp_flight_size_decrease(tp1); 3154 sctp_total_flight_decrease(stcb, tp1); 3155 } { 3156 /* audit code */ 3157 unsigned int audit; 3158 3159 audit = 0; 3160 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3161 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3162 audit++; 3163 } 3164 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3165 sctp_next) { 3166 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3167 audit++; 3168 } 3169 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3170 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3171 audit, stcb->asoc.sent_queue_retran_cnt); 3172#ifndef SCTP_AUDITING_ENABLED 3173 stcb->asoc.sent_queue_retran_cnt = audit; 3174#endif 3175 } 3176 } 3177 } 3178 break; 3179 case SCTP_ASCONF: 3180 { 3181 struct sctp_tmit_chunk *asconf; 3182 3183 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3184 sctp_next) { 3185 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3186 break; 3187 } 3188 } 3189 if (asconf) { 3190 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3191 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3192 asconf->sent = SCTP_DATAGRAM_RESEND; 3193 asconf->snd_count--; 3194 } 3195 } 3196 break; 3197 case SCTP_INITIATION: 3198 /* resend the INIT */ 3199 stcb->asoc.dropped_special_cnt++; 3200 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3201 /* 3202 * If we can get it in, in a few attempts we do 3203 * this, otherwise we let the timer fire. 3204 */ 3205 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3206 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3207 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3208 } 3209 break; 3210 case SCTP_SELECTIVE_ACK: 3211 /* resend the sack */ 3212 sctp_send_sack(stcb); 3213 break; 3214 /* EY for nr_sacks */ 3215 case SCTP_NR_SELECTIVE_ACK: 3216 sctp_send_nr_sack(stcb); /* EY resend the nr-sack */ 3217 break; 3218 case SCTP_HEARTBEAT_REQUEST: 3219 /* resend a demand HB */ 3220 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3221 /* 3222 * Only retransmit if we KNOW we wont destroy the 3223 * tcb 3224 */ 3225 (void)sctp_send_hb(stcb, 1, net); 3226 } 3227 break; 3228 case SCTP_SHUTDOWN: 3229 sctp_send_shutdown(stcb, net); 3230 break; 3231 case SCTP_SHUTDOWN_ACK: 3232 sctp_send_shutdown_ack(stcb, net); 3233 break; 3234 case SCTP_COOKIE_ECHO: 3235 { 3236 struct sctp_tmit_chunk *cookie; 3237 3238 cookie = NULL; 3239 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3240 sctp_next) { 3241 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3242 break; 3243 } 3244 } 3245 if (cookie) { 3246 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3247 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3248 cookie->sent = SCTP_DATAGRAM_RESEND; 3249 sctp_stop_all_cookie_timers(stcb); 3250 } 3251 } 3252 break; 3253 case SCTP_COOKIE_ACK: 3254 sctp_send_cookie_ack(stcb); 3255 break; 3256 case SCTP_ASCONF_ACK: 3257 /* resend last asconf ack */ 3258 sctp_send_asconf_ack(stcb); 3259 break; 3260 case SCTP_FORWARD_CUM_TSN: 3261 send_forward_tsn(stcb, &stcb->asoc); 3262 break; 3263 /* can't do anything with these */ 3264 case SCTP_PACKET_DROPPED: 3265 case SCTP_INITIATION_ACK: /* this should not happen */ 3266 case SCTP_HEARTBEAT_ACK: 3267 case SCTP_ABORT_ASSOCIATION: 3268 case SCTP_OPERATION_ERROR: 3269 case SCTP_SHUTDOWN_COMPLETE: 3270 case SCTP_ECN_ECHO: 3271 case SCTP_ECN_CWR: 3272 default: 3273 break; 3274 } 3275 return (0); 3276} 3277 3278void 3279sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3280{ 3281 int i; 3282 uint16_t temp; 3283 3284 /* 3285 * We set things to 0xffff since this is the last delivered sequence 3286 * and we will be sending in 0 after the reset. 3287 */ 3288 3289 if (number_entries) { 3290 for (i = 0; i < number_entries; i++) { 3291 temp = ntohs(list[i]); 3292 if (temp >= stcb->asoc.streamincnt) { 3293 continue; 3294 } 3295 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3296 } 3297 } else { 3298 list = NULL; 3299 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3300 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3301 } 3302 } 3303 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3304} 3305 3306static void 3307sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3308{ 3309 int i; 3310 3311 if (number_entries == 0) { 3312 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3313 stcb->asoc.strmout[i].next_sequence_sent = 0; 3314 } 3315 } else if (number_entries) { 3316 for (i = 0; i < number_entries; i++) { 3317 uint16_t temp; 3318 3319 temp = ntohs(list[i]); 3320 if (temp >= stcb->asoc.streamoutcnt) { 3321 /* no such stream */ 3322 continue; 3323 } 3324 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3325 } 3326 } 3327 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3328} 3329 3330 3331struct sctp_stream_reset_out_request * 3332sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3333{ 3334 struct sctp_association *asoc; 3335 struct sctp_stream_reset_out_req *req; 3336 struct sctp_stream_reset_out_request *r; 3337 struct sctp_tmit_chunk *chk; 3338 int len, clen; 3339 3340 asoc = &stcb->asoc; 3341 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3342 asoc->stream_reset_outstanding = 0; 3343 return (NULL); 3344 } 3345 if (stcb->asoc.str_reset == NULL) { 3346 asoc->stream_reset_outstanding = 0; 3347 return (NULL); 3348 } 3349 chk = stcb->asoc.str_reset; 3350 if (chk->data == NULL) { 3351 return (NULL); 3352 } 3353 if (bchk) { 3354 /* he wants a copy of the chk pointer */ 3355 *bchk = chk; 3356 } 3357 clen = chk->send_size; 3358 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 3359 r = &req->sr_req; 3360 if (ntohl(r->request_seq) == seq) { 3361 /* found it */ 3362 return (r); 3363 } 3364 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3365 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3366 /* move to the next one, there can only be a max of two */ 3367 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3368 if (ntohl(r->request_seq) == seq) { 3369 return (r); 3370 } 3371 } 3372 /* that seq is not here */ 3373 return (NULL); 3374} 3375 3376static void 3377sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3378{ 3379 struct sctp_association *asoc; 3380 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3381 3382 if (stcb->asoc.str_reset == NULL) { 3383 return; 3384 } 3385 asoc = &stcb->asoc; 3386 3387 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3388 TAILQ_REMOVE(&asoc->control_send_queue, 3389 chk, 3390 sctp_next); 3391 if (chk->data) { 3392 sctp_m_freem(chk->data); 3393 chk->data = NULL; 3394 } 3395 asoc->ctrl_queue_cnt--; 3396 sctp_free_a_chunk(stcb, chk); 3397 /* sa_ignore NO_NULL_CHK */ 3398 stcb->asoc.str_reset = NULL; 3399} 3400 3401 3402static int 3403sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3404 uint32_t seq, uint32_t action, 3405 struct sctp_stream_reset_response *respin) 3406{ 3407 uint16_t type; 3408 int lparm_len; 3409 struct sctp_association *asoc = &stcb->asoc; 3410 struct sctp_tmit_chunk *chk; 3411 struct sctp_stream_reset_out_request *srparam; 3412 int number_entries; 3413 3414 if (asoc->stream_reset_outstanding == 0) { 3415 /* duplicate */ 3416 return (0); 3417 } 3418 if (seq == stcb->asoc.str_reset_seq_out) { 3419 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3420 if (srparam) { 3421 stcb->asoc.str_reset_seq_out++; 3422 type = ntohs(srparam->ph.param_type); 3423 lparm_len = ntohs(srparam->ph.param_length); 3424 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3425 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3426 asoc->stream_reset_out_is_outstanding = 0; 3427 if (asoc->stream_reset_outstanding) 3428 asoc->stream_reset_outstanding--; 3429 if (action == SCTP_STREAM_RESET_PERFORMED) { 3430 /* do it */ 3431 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3432 } else { 3433 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3434 } 3435 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3436 /* Answered my request */ 3437 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3438 if (asoc->stream_reset_outstanding) 3439 asoc->stream_reset_outstanding--; 3440 if (action != SCTP_STREAM_RESET_PERFORMED) { 3441 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3442 } 3443 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3444 /** 3445 * a) Adopt the new in tsn. 3446 * b) reset the map 3447 * c) Adopt the new out-tsn 3448 */ 3449 struct sctp_stream_reset_response_tsn *resp; 3450 struct sctp_forward_tsn_chunk fwdtsn; 3451 int abort_flag = 0; 3452 3453 if (respin == NULL) { 3454 /* huh ? */ 3455 return (0); 3456 } 3457 if (action == SCTP_STREAM_RESET_PERFORMED) { 3458 resp = (struct sctp_stream_reset_response_tsn *)respin; 3459 asoc->stream_reset_outstanding--; 3460 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3461 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3462 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3463 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3464 if (abort_flag) { 3465 return (1); 3466 } 3467 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3468 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3469 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3470 } 3471 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3472 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3473 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3474 3475 /* 3476 * EY 05/13/08 - nr_sack: to keep 3477 * nr_mapping array be consistent 3478 * with mapping_array 3479 */ 3480 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3481 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3482 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.mapping_array_base_tsn; 3483 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3484 } 3485 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3486 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3487 3488 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3489 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3490 3491 } 3492 } 3493 /* get rid of the request and get the request flags */ 3494 if (asoc->stream_reset_outstanding == 0) { 3495 sctp_clean_up_stream_reset(stcb); 3496 } 3497 } 3498 } 3499 return (0); 3500} 3501 3502static void 3503sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3504 struct sctp_tmit_chunk *chk, 3505 struct sctp_stream_reset_in_request *req, int trunc) 3506{ 3507 uint32_t seq; 3508 int len, i; 3509 int number_entries; 3510 uint16_t temp; 3511 3512 /* 3513 * peer wants me to send a str-reset to him for my outgoing seq's if 3514 * seq_in is right. 3515 */ 3516 struct sctp_association *asoc = &stcb->asoc; 3517 3518 seq = ntohl(req->request_seq); 3519 if (asoc->str_reset_seq_in == seq) { 3520 if (trunc) { 3521 /* Can't do it, since they exceeded our buffer size */ 3522 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3523 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3524 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3525 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3526 len = ntohs(req->ph.param_length); 3527 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3528 for (i = 0; i < number_entries; i++) { 3529 temp = ntohs(req->list_of_streams[i]); 3530 req->list_of_streams[i] = temp; 3531 } 3532 /* move the reset action back one */ 3533 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3534 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3535 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3536 asoc->str_reset_seq_out, 3537 seq, (asoc->sending_seq - 1)); 3538 asoc->stream_reset_out_is_outstanding = 1; 3539 asoc->str_reset = chk; 3540 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3541 stcb->asoc.stream_reset_outstanding++; 3542 } else { 3543 /* Can't do it, since we have sent one out */ 3544 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3545 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3546 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3547 } 3548 asoc->str_reset_seq_in++; 3549 } else if (asoc->str_reset_seq_in - 1 == seq) { 3550 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3551 } else if (asoc->str_reset_seq_in - 2 == seq) { 3552 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3553 } else { 3554 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3555 } 3556} 3557 3558static int 3559sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3560 struct sctp_tmit_chunk *chk, 3561 struct sctp_stream_reset_tsn_request *req) 3562{ 3563 /* reset all in and out and update the tsn */ 3564 /* 3565 * A) reset my str-seq's on in and out. B) Select a receive next, 3566 * and set cum-ack to it. Also process this selected number as a 3567 * fwd-tsn as well. C) set in the response my next sending seq. 3568 */ 3569 struct sctp_forward_tsn_chunk fwdtsn; 3570 struct sctp_association *asoc = &stcb->asoc; 3571 int abort_flag = 0; 3572 uint32_t seq; 3573 3574 seq = ntohl(req->request_seq); 3575 if (asoc->str_reset_seq_in == seq) { 3576 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3577 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3578 fwdtsn.ch.chunk_flags = 0; 3579 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3580 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3581 if (abort_flag) { 3582 return (1); 3583 } 3584 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3585 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3586 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3587 } 3588 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3589 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3590 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3591 /* 3592 * EY 05/13/08 -nr_sack: to keep nr_mapping array consistent 3593 * with mapping array 3594 */ 3595 if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) { 3596 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3597 stcb->asoc.nr_mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3598 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); 3599 } 3600 atomic_add_int(&stcb->asoc.sending_seq, 1); 3601 /* save off historical data for retrans */ 3602 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3603 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3604 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3605 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3606 3607 sctp_add_stream_reset_result_tsn(chk, 3608 ntohl(req->request_seq), 3609 SCTP_STREAM_RESET_PERFORMED, 3610 stcb->asoc.sending_seq, 3611 stcb->asoc.mapping_array_base_tsn); 3612 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3613 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3614 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3615 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3616 3617 asoc->str_reset_seq_in++; 3618 } else if (asoc->str_reset_seq_in - 1 == seq) { 3619 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3620 stcb->asoc.last_sending_seq[0], 3621 stcb->asoc.last_base_tsnsent[0] 3622 ); 3623 } else if (asoc->str_reset_seq_in - 2 == seq) { 3624 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3625 stcb->asoc.last_sending_seq[1], 3626 stcb->asoc.last_base_tsnsent[1] 3627 ); 3628 } else { 3629 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3630 } 3631 return (0); 3632} 3633 3634static void 3635sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3636 struct sctp_tmit_chunk *chk, 3637 struct sctp_stream_reset_out_request *req, int trunc) 3638{ 3639 uint32_t seq, tsn; 3640 int number_entries, len; 3641 struct sctp_association *asoc = &stcb->asoc; 3642 3643 seq = ntohl(req->request_seq); 3644 3645 /* now if its not a duplicate we process it */ 3646 if (asoc->str_reset_seq_in == seq) { 3647 len = ntohs(req->ph.param_length); 3648 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3649 /* 3650 * the sender is resetting, handle the list issue.. we must 3651 * a) verify if we can do the reset, if so no problem b) If 3652 * we can't do the reset we must copy the request. c) queue 3653 * it, and setup the data in processor to trigger it off 3654 * when needed and dequeue all the queued data. 3655 */ 3656 tsn = ntohl(req->send_reset_at_tsn); 3657 3658 /* move the reset action back one */ 3659 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3660 if (trunc) { 3661 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3662 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3663 } else if ((tsn == asoc->cumulative_tsn) || 3664 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3665 /* we can do it now */ 3666 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3667 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3668 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3669 } else { 3670 /* 3671 * we must queue it up and thus wait for the TSN's 3672 * to arrive that are at or before tsn 3673 */ 3674 struct sctp_stream_reset_list *liste; 3675 int siz; 3676 3677 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3678 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3679 siz, SCTP_M_STRESET); 3680 if (liste == NULL) { 3681 /* gak out of memory */ 3682 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3683 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3684 return; 3685 } 3686 liste->tsn = tsn; 3687 liste->number_entries = number_entries; 3688 memcpy(&liste->req, req, 3689 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3690 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3691 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3692 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3693 } 3694 asoc->str_reset_seq_in++; 3695 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3696 /* 3697 * one seq back, just echo back last action since my 3698 * response was lost. 3699 */ 3700 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3701 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3702 /* 3703 * two seq back, just echo back last action since my 3704 * response was lost. 3705 */ 3706 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3707 } else { 3708 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3709 } 3710} 3711 3712#ifdef __GNUC__ 3713__attribute__((noinline)) 3714#endif 3715 static int 3716 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3717 struct sctp_stream_reset_out_req *sr_req) 3718{ 3719 int chk_length, param_len, ptype; 3720 struct sctp_paramhdr pstore; 3721 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3722 3723 uint32_t seq; 3724 int num_req = 0; 3725 int trunc = 0; 3726 struct sctp_tmit_chunk *chk; 3727 struct sctp_chunkhdr *ch; 3728 struct sctp_paramhdr *ph; 3729 int ret_code = 0; 3730 int num_param = 0; 3731 3732 /* now it may be a reset or a reset-response */ 3733 chk_length = ntohs(sr_req->ch.chunk_length); 3734 3735 /* setup for adding the response */ 3736 sctp_alloc_a_chunk(stcb, chk); 3737 if (chk == NULL) { 3738 return (ret_code); 3739 } 3740 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3741 chk->rec.chunk_id.can_take_data = 0; 3742 chk->asoc = &stcb->asoc; 3743 chk->no_fr_allowed = 0; 3744 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3745 chk->book_size_scale = 0; 3746 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3747 if (chk->data == NULL) { 3748strres_nochunk: 3749 if (chk->data) { 3750 sctp_m_freem(chk->data); 3751 chk->data = NULL; 3752 } 3753 sctp_free_a_chunk(stcb, chk); 3754 return (ret_code); 3755 } 3756 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3757 3758 /* setup chunk parameters */ 3759 chk->sent = SCTP_DATAGRAM_UNSENT; 3760 chk->snd_count = 0; 3761 chk->whoTo = stcb->asoc.primary_destination; 3762 atomic_add_int(&chk->whoTo->ref_count, 1); 3763 3764 ch = mtod(chk->data, struct sctp_chunkhdr *); 3765 ch->chunk_type = SCTP_STREAM_RESET; 3766 ch->chunk_flags = 0; 3767 ch->chunk_length = htons(chk->send_size); 3768 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3769 offset += sizeof(struct sctp_chunkhdr); 3770 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3771 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3772 if (ph == NULL) 3773 break; 3774 param_len = ntohs(ph->param_length); 3775 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3776 /* bad param */ 3777 break; 3778 } 3779 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3780 (uint8_t *) & cstore); 3781 ptype = ntohs(ph->param_type); 3782 num_param++; 3783 if (param_len > (int)sizeof(cstore)) { 3784 trunc = 1; 3785 } else { 3786 trunc = 0; 3787 } 3788 3789 if (num_param > SCTP_MAX_RESET_PARAMS) { 3790 /* hit the max of parameters already sorry.. */ 3791 break; 3792 } 3793 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3794 struct sctp_stream_reset_out_request *req_out; 3795 3796 req_out = (struct sctp_stream_reset_out_request *)ph; 3797 num_req++; 3798 if (stcb->asoc.stream_reset_outstanding) { 3799 seq = ntohl(req_out->response_seq); 3800 if (seq == stcb->asoc.str_reset_seq_out) { 3801 /* implicit ack */ 3802 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3803 } 3804 } 3805 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3806 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3807 struct sctp_stream_reset_in_request *req_in; 3808 3809 num_req++; 3810 3811 req_in = (struct sctp_stream_reset_in_request *)ph; 3812 3813 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3814 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3815 struct sctp_stream_reset_tsn_request *req_tsn; 3816 3817 num_req++; 3818 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3819 3820 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3821 ret_code = 1; 3822 goto strres_nochunk; 3823 } 3824 /* no more */ 3825 break; 3826 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3827 struct sctp_stream_reset_response *resp; 3828 uint32_t result; 3829 3830 resp = (struct sctp_stream_reset_response *)ph; 3831 seq = ntohl(resp->response_seq); 3832 result = ntohl(resp->result); 3833 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3834 ret_code = 1; 3835 goto strres_nochunk; 3836 } 3837 } else { 3838 break; 3839 } 3840 offset += SCTP_SIZE32(param_len); 3841 chk_length -= SCTP_SIZE32(param_len); 3842 } 3843 if (num_req == 0) { 3844 /* we have no response free the stuff */ 3845 goto strres_nochunk; 3846 } 3847 /* ok we have a chunk to link in */ 3848 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3849 chk, 3850 sctp_next); 3851 stcb->asoc.ctrl_queue_cnt++; 3852 return (ret_code); 3853} 3854 3855/* 3856 * Handle a router or endpoints report of a packet loss, there are two ways 3857 * to handle this, either we get the whole packet and must disect it 3858 * ourselves (possibly with truncation and or corruption) or it is a summary 3859 * from a middle box that did the disectting for us. 3860 */ 3861static void 3862sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3863 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3864{ 3865 uint32_t bottle_bw, on_queue; 3866 uint16_t trunc_len; 3867 unsigned int chlen; 3868 unsigned int at; 3869 struct sctp_chunk_desc desc; 3870 struct sctp_chunkhdr *ch; 3871 3872 chlen = ntohs(cp->ch.chunk_length); 3873 chlen -= sizeof(struct sctp_pktdrop_chunk); 3874 /* XXX possible chlen underflow */ 3875 if (chlen == 0) { 3876 ch = NULL; 3877 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3878 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3879 } else { 3880 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3881 chlen -= sizeof(struct sctphdr); 3882 /* XXX possible chlen underflow */ 3883 memset(&desc, 0, sizeof(desc)); 3884 } 3885 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3886 if (trunc_len > limit) { 3887 trunc_len = limit; 3888 } 3889 /* now the chunks themselves */ 3890 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3891 desc.chunk_type = ch->chunk_type; 3892 /* get amount we need to move */ 3893 at = ntohs(ch->chunk_length); 3894 if (at < sizeof(struct sctp_chunkhdr)) { 3895 /* corrupt chunk, maybe at the end? */ 3896 SCTP_STAT_INCR(sctps_pdrpcrupt); 3897 break; 3898 } 3899 if (trunc_len == 0) { 3900 /* we are supposed to have all of it */ 3901 if (at > chlen) { 3902 /* corrupt skip it */ 3903 SCTP_STAT_INCR(sctps_pdrpcrupt); 3904 break; 3905 } 3906 } else { 3907 /* is there enough of it left ? */ 3908 if (desc.chunk_type == SCTP_DATA) { 3909 if (chlen < (sizeof(struct sctp_data_chunk) + 3910 sizeof(desc.data_bytes))) { 3911 break; 3912 } 3913 } else { 3914 if (chlen < sizeof(struct sctp_chunkhdr)) { 3915 break; 3916 } 3917 } 3918 } 3919 if (desc.chunk_type == SCTP_DATA) { 3920 /* can we get out the tsn? */ 3921 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3922 SCTP_STAT_INCR(sctps_pdrpmbda); 3923 3924 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3925 /* yep */ 3926 struct sctp_data_chunk *dcp; 3927 uint8_t *ddp; 3928 unsigned int iii; 3929 3930 dcp = (struct sctp_data_chunk *)ch; 3931 ddp = (uint8_t *) (dcp + 1); 3932 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3933 desc.data_bytes[iii] = ddp[iii]; 3934 } 3935 desc.tsn_ifany = dcp->dp.tsn; 3936 } else { 3937 /* nope we are done. */ 3938 SCTP_STAT_INCR(sctps_pdrpnedat); 3939 break; 3940 } 3941 } else { 3942 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3943 SCTP_STAT_INCR(sctps_pdrpmbct); 3944 } 3945 3946 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3947 SCTP_STAT_INCR(sctps_pdrppdbrk); 3948 break; 3949 } 3950 if (SCTP_SIZE32(at) > chlen) { 3951 break; 3952 } 3953 chlen -= SCTP_SIZE32(at); 3954 if (chlen < sizeof(struct sctp_chunkhdr)) { 3955 /* done, none left */ 3956 break; 3957 } 3958 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3959 } 3960 /* Now update any rwnd --- possibly */ 3961 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3962 /* From a peer, we get a rwnd report */ 3963 uint32_t a_rwnd; 3964 3965 SCTP_STAT_INCR(sctps_pdrpfehos); 3966 3967 bottle_bw = ntohl(cp->bottle_bw); 3968 on_queue = ntohl(cp->current_onq); 3969 if (bottle_bw && on_queue) { 3970 /* a rwnd report is in here */ 3971 if (bottle_bw > on_queue) 3972 a_rwnd = bottle_bw - on_queue; 3973 else 3974 a_rwnd = 0; 3975 3976 if (a_rwnd == 0) 3977 stcb->asoc.peers_rwnd = 0; 3978 else { 3979 if (a_rwnd > stcb->asoc.total_flight) { 3980 stcb->asoc.peers_rwnd = 3981 a_rwnd - stcb->asoc.total_flight; 3982 } else { 3983 stcb->asoc.peers_rwnd = 0; 3984 } 3985 if (stcb->asoc.peers_rwnd < 3986 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3987 /* SWS sender side engages */ 3988 stcb->asoc.peers_rwnd = 0; 3989 } 3990 } 3991 } 3992 } else { 3993 SCTP_STAT_INCR(sctps_pdrpfmbox); 3994 } 3995 3996 /* now middle boxes in sat networks get a cwnd bump */ 3997 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3998 (stcb->asoc.sat_t3_loss_recovery == 0) && 3999 (stcb->asoc.sat_network)) { 4000 /* 4001 * This is debateable but for sat networks it makes sense 4002 * Note if a T3 timer has went off, we will prohibit any 4003 * changes to cwnd until we exit the t3 loss recovery. 4004 */ 4005 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4006 net, cp, &bottle_bw, &on_queue); 4007 } 4008} 4009 4010/* 4011 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4012 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4013 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4014 * length of the complete packet outputs: - length: modified to remaining 4015 * length after control processing - netp: modified to new sctp_nets after 4016 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4017 * bad packet,...) otherwise return the tcb for this packet 4018 */ 4019#ifdef __GNUC__ 4020__attribute__((noinline)) 4021#endif 4022 static struct sctp_tcb * 4023 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4024 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4025 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4026 uint32_t vrf_id, uint16_t port) 4027{ 4028 struct sctp_association *asoc; 4029 uint32_t vtag_in; 4030 int num_chunks = 0; /* number of control chunks processed */ 4031 uint32_t chk_length; 4032 int ret; 4033 int abort_no_unlock = 0; 4034 4035 /* 4036 * How big should this be, and should it be alloc'd? Lets try the 4037 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4038 * until we get into jumbo grams and such.. 4039 */ 4040 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4041 struct sctp_tcb *locked_tcb = stcb; 4042 int got_auth = 0; 4043 uint32_t auth_offset = 0, auth_len = 0; 4044 int auth_skipped = 0; 4045 int asconf_cnt = 0; 4046 4047#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4048 struct socket *so; 4049 4050#endif 4051 4052 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4053 iphlen, *offset, length, stcb); 4054 4055 /* validate chunk header length... */ 4056 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4057 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4058 ntohs(ch->chunk_length)); 4059 if (locked_tcb) { 4060 SCTP_TCB_UNLOCK(locked_tcb); 4061 } 4062 return (NULL); 4063 } 4064 /* 4065 * validate the verification tag 4066 */ 4067 vtag_in = ntohl(sh->v_tag); 4068 4069 if (locked_tcb) { 4070 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4071 } 4072 if (ch->chunk_type == SCTP_INITIATION) { 4073 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4074 ntohs(ch->chunk_length), vtag_in); 4075 if (vtag_in != 0) { 4076 /* protocol error- silently discard... */ 4077 SCTP_STAT_INCR(sctps_badvtag); 4078 if (locked_tcb) { 4079 SCTP_TCB_UNLOCK(locked_tcb); 4080 } 4081 return (NULL); 4082 } 4083 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4084 /* 4085 * If there is no stcb, skip the AUTH chunk and process 4086 * later after a stcb is found (to validate the lookup was 4087 * valid. 4088 */ 4089 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4090 (stcb == NULL) && 4091 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4092 /* save this chunk for later processing */ 4093 auth_skipped = 1; 4094 auth_offset = *offset; 4095 auth_len = ntohs(ch->chunk_length); 4096 4097 /* (temporarily) move past this chunk */ 4098 *offset += SCTP_SIZE32(auth_len); 4099 if (*offset >= length) { 4100 /* no more data left in the mbuf chain */ 4101 *offset = length; 4102 if (locked_tcb) { 4103 SCTP_TCB_UNLOCK(locked_tcb); 4104 } 4105 return (NULL); 4106 } 4107 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4108 sizeof(struct sctp_chunkhdr), chunk_buf); 4109 } 4110 if (ch == NULL) { 4111 /* Help */ 4112 *offset = length; 4113 if (locked_tcb) { 4114 SCTP_TCB_UNLOCK(locked_tcb); 4115 } 4116 return (NULL); 4117 } 4118 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4119 goto process_control_chunks; 4120 } 4121 /* 4122 * first check if it's an ASCONF with an unknown src addr we 4123 * need to look inside to find the association 4124 */ 4125 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4126 struct sctp_chunkhdr *asconf_ch = ch; 4127 uint32_t asconf_offset = 0, asconf_len = 0; 4128 4129 /* inp's refcount may be reduced */ 4130 SCTP_INP_INCR_REF(inp); 4131 4132 asconf_offset = *offset; 4133 do { 4134 asconf_len = ntohs(asconf_ch->chunk_length); 4135 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4136 break; 4137 stcb = sctp_findassociation_ep_asconf(m, iphlen, 4138 *offset, sh, &inp, netp, vrf_id); 4139 if (stcb != NULL) 4140 break; 4141 asconf_offset += SCTP_SIZE32(asconf_len); 4142 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4143 sizeof(struct sctp_chunkhdr), chunk_buf); 4144 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4145 if (stcb == NULL) { 4146 /* 4147 * reduce inp's refcount if not reduced in 4148 * sctp_findassociation_ep_asconf(). 4149 */ 4150 SCTP_INP_DECR_REF(inp); 4151 } else { 4152 locked_tcb = stcb; 4153 } 4154 4155 /* now go back and verify any auth chunk to be sure */ 4156 if (auth_skipped && (stcb != NULL)) { 4157 struct sctp_auth_chunk *auth; 4158 4159 auth = (struct sctp_auth_chunk *) 4160 sctp_m_getptr(m, auth_offset, 4161 auth_len, chunk_buf); 4162 got_auth = 1; 4163 auth_skipped = 0; 4164 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4165 auth_offset)) { 4166 /* auth HMAC failed so dump it */ 4167 *offset = length; 4168 if (locked_tcb) { 4169 SCTP_TCB_UNLOCK(locked_tcb); 4170 } 4171 return (NULL); 4172 } else { 4173 /* remaining chunks are HMAC checked */ 4174 stcb->asoc.authenticated = 1; 4175 } 4176 } 4177 } 4178 if (stcb == NULL) { 4179 /* no association, so it's out of the blue... */ 4180 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 4181 vrf_id, port); 4182 *offset = length; 4183 if (locked_tcb) { 4184 SCTP_TCB_UNLOCK(locked_tcb); 4185 } 4186 return (NULL); 4187 } 4188 asoc = &stcb->asoc; 4189 /* ABORT and SHUTDOWN can use either v_tag... */ 4190 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4191 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4192 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4193 if ((vtag_in == asoc->my_vtag) || 4194 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4195 (vtag_in == asoc->peer_vtag))) { 4196 /* this is valid */ 4197 } else { 4198 /* drop this packet... */ 4199 SCTP_STAT_INCR(sctps_badvtag); 4200 if (locked_tcb) { 4201 SCTP_TCB_UNLOCK(locked_tcb); 4202 } 4203 return (NULL); 4204 } 4205 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4206 if (vtag_in != asoc->my_vtag) { 4207 /* 4208 * this could be a stale SHUTDOWN-ACK or the 4209 * peer never got the SHUTDOWN-COMPLETE and 4210 * is still hung; we have started a new asoc 4211 * but it won't complete until the shutdown 4212 * is completed 4213 */ 4214 if (locked_tcb) { 4215 SCTP_TCB_UNLOCK(locked_tcb); 4216 } 4217 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 4218 NULL, vrf_id, port); 4219 return (NULL); 4220 } 4221 } else { 4222 /* for all other chunks, vtag must match */ 4223 if (vtag_in != asoc->my_vtag) { 4224 /* invalid vtag... */ 4225 SCTPDBG(SCTP_DEBUG_INPUT3, 4226 "invalid vtag: %xh, expect %xh\n", 4227 vtag_in, asoc->my_vtag); 4228 SCTP_STAT_INCR(sctps_badvtag); 4229 if (locked_tcb) { 4230 SCTP_TCB_UNLOCK(locked_tcb); 4231 } 4232 *offset = length; 4233 return (NULL); 4234 } 4235 } 4236 } /* end if !SCTP_COOKIE_ECHO */ 4237 /* 4238 * process all control chunks... 4239 */ 4240 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4241 /* EY */ 4242 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4243 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4244 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4245 /* implied cookie-ack.. we must have lost the ack */ 4246 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4247 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4248 stcb->asoc.overall_error_count, 4249 0, 4250 SCTP_FROM_SCTP_INPUT, 4251 __LINE__); 4252 } 4253 stcb->asoc.overall_error_count = 0; 4254 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4255 *netp); 4256 } 4257process_control_chunks: 4258 while (IS_SCTP_CONTROL(ch)) { 4259 /* validate chunk length */ 4260 chk_length = ntohs(ch->chunk_length); 4261 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4262 ch->chunk_type, chk_length); 4263 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4264 if (chk_length < sizeof(*ch) || 4265 (*offset + (int)chk_length) > length) { 4266 *offset = length; 4267 if (locked_tcb) { 4268 SCTP_TCB_UNLOCK(locked_tcb); 4269 } 4270 return (NULL); 4271 } 4272 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4273 /* 4274 * INIT-ACK only gets the init ack "header" portion only 4275 * because we don't have to process the peer's COOKIE. All 4276 * others get a complete chunk. 4277 */ 4278 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4279 (ch->chunk_type == SCTP_INITIATION)) { 4280 /* get an init-ack chunk */ 4281 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4282 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4283 if (ch == NULL) { 4284 *offset = length; 4285 if (locked_tcb) { 4286 SCTP_TCB_UNLOCK(locked_tcb); 4287 } 4288 return (NULL); 4289 } 4290 } else { 4291 /* For cookies and all other chunks. */ 4292 if (chk_length > sizeof(chunk_buf)) { 4293 /* 4294 * use just the size of the chunk buffer so 4295 * the front part of our chunks fit in 4296 * contiguous space up to the chunk buffer 4297 * size (508 bytes). For chunks that need to 4298 * get more than that they must use the 4299 * sctp_m_getptr() function or other means 4300 * (e.g. know how to parse mbuf chains). 4301 * Cookies do this already. 4302 */ 4303 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4304 (sizeof(chunk_buf) - 4), 4305 chunk_buf); 4306 if (ch == NULL) { 4307 *offset = length; 4308 if (locked_tcb) { 4309 SCTP_TCB_UNLOCK(locked_tcb); 4310 } 4311 return (NULL); 4312 } 4313 } else { 4314 /* We can fit it all */ 4315 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4316 chk_length, chunk_buf); 4317 if (ch == NULL) { 4318 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4319 *offset = length; 4320 if (locked_tcb) { 4321 SCTP_TCB_UNLOCK(locked_tcb); 4322 } 4323 return (NULL); 4324 } 4325 } 4326 } 4327 num_chunks++; 4328 /* Save off the last place we got a control from */ 4329 if (stcb != NULL) { 4330 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4331 /* 4332 * allow last_control to be NULL if 4333 * ASCONF... ASCONF processing will find the 4334 * right net later 4335 */ 4336 if ((netp != NULL) && (*netp != NULL)) 4337 stcb->asoc.last_control_chunk_from = *netp; 4338 } 4339 } 4340#ifdef SCTP_AUDITING_ENABLED 4341 sctp_audit_log(0xB0, ch->chunk_type); 4342#endif 4343 4344 /* check to see if this chunk required auth, but isn't */ 4345 if ((stcb != NULL) && 4346 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4347 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4348 !stcb->asoc.authenticated) { 4349 /* "silently" ignore */ 4350 SCTP_STAT_INCR(sctps_recvauthmissing); 4351 goto next_chunk; 4352 } 4353 switch (ch->chunk_type) { 4354 case SCTP_INITIATION: 4355 /* must be first and only chunk */ 4356 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4357 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4358 /* We are not interested anymore? */ 4359 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4360 /* 4361 * collision case where we are 4362 * sending to them too 4363 */ 4364 ; 4365 } else { 4366 if (locked_tcb) { 4367 SCTP_TCB_UNLOCK(locked_tcb); 4368 } 4369 *offset = length; 4370 return (NULL); 4371 } 4372 } 4373 if ((chk_length > SCTP_LARGEST_INIT_ACCEPTED) || 4374 (num_chunks > 1) || 4375 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4376 *offset = length; 4377 if (locked_tcb) { 4378 SCTP_TCB_UNLOCK(locked_tcb); 4379 } 4380 return (NULL); 4381 } 4382 if ((stcb != NULL) && 4383 (SCTP_GET_STATE(&stcb->asoc) == 4384 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 4385 sctp_send_shutdown_ack(stcb, 4386 stcb->asoc.primary_destination); 4387 *offset = length; 4388 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4389 if (locked_tcb) { 4390 SCTP_TCB_UNLOCK(locked_tcb); 4391 } 4392 return (NULL); 4393 } 4394 if (netp) { 4395 sctp_handle_init(m, iphlen, *offset, sh, 4396 (struct sctp_init_chunk *)ch, inp, 4397 stcb, *netp, &abort_no_unlock, vrf_id, port); 4398 } 4399 if (abort_no_unlock) 4400 return (NULL); 4401 4402 *offset = length; 4403 if (locked_tcb) { 4404 SCTP_TCB_UNLOCK(locked_tcb); 4405 } 4406 return (NULL); 4407 break; 4408 case SCTP_PAD_CHUNK: 4409 break; 4410 case SCTP_INITIATION_ACK: 4411 /* must be first and only chunk */ 4412 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4413 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4414 /* We are not interested anymore */ 4415 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4416 ; 4417 } else { 4418 if (locked_tcb) { 4419 SCTP_TCB_UNLOCK(locked_tcb); 4420 } 4421 *offset = length; 4422 if (stcb) { 4423#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4424 so = SCTP_INP_SO(inp); 4425 atomic_add_int(&stcb->asoc.refcnt, 1); 4426 SCTP_TCB_UNLOCK(stcb); 4427 SCTP_SOCKET_LOCK(so, 1); 4428 SCTP_TCB_LOCK(stcb); 4429 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4430#endif 4431 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4432#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4433 SCTP_SOCKET_UNLOCK(so, 1); 4434#endif 4435 } 4436 return (NULL); 4437 } 4438 } 4439 if ((num_chunks > 1) || 4440 (SCTP_BASE_SYSCTL(sctp_strict_init) && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 4441 *offset = length; 4442 if (locked_tcb) { 4443 SCTP_TCB_UNLOCK(locked_tcb); 4444 } 4445 return (NULL); 4446 } 4447 if ((netp) && (*netp)) { 4448 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 4449 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 4450 } else { 4451 ret = -1; 4452 } 4453 /* 4454 * Special case, I must call the output routine to 4455 * get the cookie echoed 4456 */ 4457 if (abort_no_unlock) 4458 return (NULL); 4459 4460 if ((stcb) && ret == 0) 4461 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4462 *offset = length; 4463 if (locked_tcb) { 4464 SCTP_TCB_UNLOCK(locked_tcb); 4465 } 4466 return (NULL); 4467 break; 4468 case SCTP_SELECTIVE_ACK: 4469 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4470 SCTP_STAT_INCR(sctps_recvsacks); 4471 { 4472 struct sctp_sack_chunk *sack; 4473 int abort_now = 0; 4474 uint32_t a_rwnd, cum_ack; 4475 uint16_t num_seg; 4476 int nonce_sum_flag; 4477 4478 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) { 4479 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n"); 4480 *offset = length; 4481 if (locked_tcb) { 4482 SCTP_TCB_UNLOCK(locked_tcb); 4483 } 4484 return (NULL); 4485 } 4486 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4487 /*- 4488 * If we have sent a shutdown-ack, we will pay no 4489 * attention to a sack sent in to us since 4490 * we don't care anymore. 4491 */ 4492 break; 4493 } 4494 sack = (struct sctp_sack_chunk *)ch; 4495 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4496 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4497 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4498 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4499 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4500 cum_ack, 4501 num_seg, 4502 a_rwnd 4503 ); 4504 stcb->asoc.seen_a_sack_this_pkt = 1; 4505 if ((stcb->asoc.pr_sctp_cnt == 0) && 4506 (num_seg == 0) && 4507 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4508 (cum_ack == stcb->asoc.last_acked_seq)) && 4509 (stcb->asoc.saw_sack_with_frags == 0) && 4510 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4511 ) { 4512 /* 4513 * We have a SIMPLE sack having no 4514 * prior segments and data on sent 4515 * queue to be acked.. Use the 4516 * faster path sack processing. We 4517 * also allow window update sacks 4518 * with no missing segments to go 4519 * this way too. 4520 */ 4521 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4522 &abort_now); 4523 } else { 4524 if (netp && *netp) 4525 sctp_handle_sack(m, *offset, 4526 sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4527 } 4528 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4529 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4530 (stcb->asoc.stream_queue_cnt == 0)) { 4531 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4532 } 4533 if (abort_now) { 4534 /* ABORT signal from sack processing */ 4535 *offset = length; 4536 return (NULL); 4537 } 4538 } 4539 break; 4540 /* 4541 * EY - nr_sack: If the received chunk is an 4542 * nr_sack chunk 4543 */ 4544 case SCTP_NR_SELECTIVE_ACK: 4545 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4546 SCTP_STAT_INCR(sctps_recvsacks); 4547 { 4548 struct sctp_nr_sack_chunk *nr_sack; 4549 int abort_now = 0; 4550 uint32_t a_rwnd, cum_ack; 4551 uint16_t num_seg, num_nr_seg; 4552 int nonce_sum_flag, all_bit; 4553 4554 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_nr_sack_chunk))) { 4555 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on nr_sack chunk, too small\n"); 4556 ignore_nr_sack: 4557 *offset = length; 4558 if (locked_tcb) { 4559 SCTP_TCB_UNLOCK(locked_tcb); 4560 } 4561 return (NULL); 4562 } 4563 /* 4564 * EY nr_sacks have not been negotiated but 4565 * the peer end sent an nr_sack, silently 4566 * discard the chunk 4567 */ 4568 if (!(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack)) { 4569 goto unknown_chunk; 4570 } 4571 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4572 /*- 4573 * If we have sent a shutdown-ack, we will pay no 4574 * attention to a sack sent in to us since 4575 * we don't care anymore. 4576 */ 4577 goto ignore_nr_sack; 4578 } 4579 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4580 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 4581 all_bit = ch->chunk_flags & SCTP_NR_SACK_ALL_BIT; 4582 4583 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4584 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4585 /* 4586 * EY -if All bit is set, then there are as 4587 * many gaps as nr_gaps 4588 */ 4589 if (all_bit) { 4590 num_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4591 } 4592 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4593 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4594 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4595 cum_ack, 4596 num_seg, 4597 a_rwnd 4598 ); 4599 stcb->asoc.seen_a_sack_this_pkt = 1; 4600 if ((stcb->asoc.pr_sctp_cnt == 0) && 4601 (num_seg == 0) && 4602 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 4603 (cum_ack == stcb->asoc.last_acked_seq)) && 4604 (stcb->asoc.saw_sack_with_frags == 0) && 4605 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4606 ) { 4607 /* 4608 * We have a SIMPLE sack having no 4609 * prior segments and data on sent 4610 * queue to be acked.. Use the 4611 * faster path sack processing. We 4612 * also allow window update sacks 4613 * with no missing segments to go 4614 * this way too. 4615 */ 4616 sctp_express_handle_nr_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 4617 &abort_now); 4618 } else { 4619 if (netp && *netp) 4620 sctp_handle_nr_sack(m, *offset, 4621 nr_sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 4622 } 4623 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4624 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4625 (stcb->asoc.stream_queue_cnt == 0)) { 4626 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4627 } 4628 if (abort_now) { 4629 /* ABORT signal from sack processing */ 4630 *offset = length; 4631 return (NULL); 4632 } 4633 } 4634 break; 4635 4636 case SCTP_HEARTBEAT_REQUEST: 4637 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4638 if ((stcb) && netp && *netp) { 4639 SCTP_STAT_INCR(sctps_recvheartbeat); 4640 sctp_send_heartbeat_ack(stcb, m, *offset, 4641 chk_length, *netp); 4642 4643 /* He's alive so give him credit */ 4644 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4645 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4646 stcb->asoc.overall_error_count, 4647 0, 4648 SCTP_FROM_SCTP_INPUT, 4649 __LINE__); 4650 } 4651 stcb->asoc.overall_error_count = 0; 4652 } 4653 break; 4654 case SCTP_HEARTBEAT_ACK: 4655 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 4656 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4657 /* Its not ours */ 4658 *offset = length; 4659 if (locked_tcb) { 4660 SCTP_TCB_UNLOCK(locked_tcb); 4661 } 4662 return (NULL); 4663 } 4664 /* He's alive so give him credit */ 4665 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4666 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4667 stcb->asoc.overall_error_count, 4668 0, 4669 SCTP_FROM_SCTP_INPUT, 4670 __LINE__); 4671 } 4672 stcb->asoc.overall_error_count = 0; 4673 SCTP_STAT_INCR(sctps_recvheartbeatack); 4674 if (netp && *netp) 4675 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4676 stcb, *netp); 4677 break; 4678 case SCTP_ABORT_ASSOCIATION: 4679 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4680 stcb); 4681 if ((stcb) && netp && *netp) 4682 sctp_handle_abort((struct sctp_abort_chunk *)ch, 4683 stcb, *netp); 4684 *offset = length; 4685 return (NULL); 4686 break; 4687 case SCTP_SHUTDOWN: 4688 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4689 stcb); 4690 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4691 *offset = length; 4692 if (locked_tcb) { 4693 SCTP_TCB_UNLOCK(locked_tcb); 4694 } 4695 return (NULL); 4696 } 4697 if (netp && *netp) { 4698 int abort_flag = 0; 4699 4700 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4701 stcb, *netp, &abort_flag); 4702 if (abort_flag) { 4703 *offset = length; 4704 return (NULL); 4705 } 4706 } 4707 break; 4708 case SCTP_SHUTDOWN_ACK: 4709 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4710 if ((stcb) && (netp) && (*netp)) 4711 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4712 *offset = length; 4713 return (NULL); 4714 break; 4715 4716 case SCTP_OPERATION_ERROR: 4717 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4718 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4719 4720 *offset = length; 4721 return (NULL); 4722 } 4723 break; 4724 case SCTP_COOKIE_ECHO: 4725 SCTPDBG(SCTP_DEBUG_INPUT3, 4726 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4727 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4728 ; 4729 } else { 4730 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4731 /* We are not interested anymore */ 4732 *offset = length; 4733 return (NULL); 4734 } 4735 } 4736 /* 4737 * First are we accepting? We do this again here 4738 * sincen it is possible that a previous endpoint 4739 * WAS listening responded to a INIT-ACK and then 4740 * closed. We opened and bound.. and are now no 4741 * longer listening. 4742 */ 4743 4744 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 4745 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4746 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4747 struct mbuf *oper; 4748 struct sctp_paramhdr *phdr; 4749 4750 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4751 0, M_DONTWAIT, 1, MT_DATA); 4752 if (oper) { 4753 SCTP_BUF_LEN(oper) = 4754 sizeof(struct sctp_paramhdr); 4755 phdr = mtod(oper, 4756 struct sctp_paramhdr *); 4757 phdr->param_type = 4758 htons(SCTP_CAUSE_OUT_OF_RESC); 4759 phdr->param_length = 4760 htons(sizeof(struct sctp_paramhdr)); 4761 } 4762 sctp_abort_association(inp, stcb, m, 4763 iphlen, sh, oper, vrf_id, port); 4764 } 4765 *offset = length; 4766 return (NULL); 4767 } else { 4768 struct mbuf *ret_buf; 4769 struct sctp_inpcb *linp; 4770 4771 if (stcb) { 4772 linp = NULL; 4773 } else { 4774 linp = inp; 4775 } 4776 4777 if (linp) { 4778 SCTP_ASOC_CREATE_LOCK(linp); 4779 } 4780 if (netp) { 4781 ret_buf = 4782 sctp_handle_cookie_echo(m, iphlen, 4783 *offset, sh, 4784 (struct sctp_cookie_echo_chunk *)ch, 4785 &inp, &stcb, netp, 4786 auth_skipped, 4787 auth_offset, 4788 auth_len, 4789 &locked_tcb, 4790 vrf_id, 4791 port); 4792 } else { 4793 ret_buf = NULL; 4794 } 4795 if (linp) { 4796 SCTP_ASOC_CREATE_UNLOCK(linp); 4797 } 4798 if (ret_buf == NULL) { 4799 if (locked_tcb) { 4800 SCTP_TCB_UNLOCK(locked_tcb); 4801 } 4802 SCTPDBG(SCTP_DEBUG_INPUT3, 4803 "GAK, null buffer\n"); 4804 auth_skipped = 0; 4805 *offset = length; 4806 return (NULL); 4807 } 4808 /* if AUTH skipped, see if it verified... */ 4809 if (auth_skipped) { 4810 got_auth = 1; 4811 auth_skipped = 0; 4812 } 4813 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4814 /* 4815 * Restart the timer if we have 4816 * pending data 4817 */ 4818 struct sctp_tmit_chunk *chk; 4819 4820 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4821 if (chk) { 4822 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4823 stcb->sctp_ep, stcb, 4824 chk->whoTo); 4825 } 4826 } 4827 } 4828 break; 4829 case SCTP_COOKIE_ACK: 4830 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4831 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4832 if (locked_tcb) { 4833 SCTP_TCB_UNLOCK(locked_tcb); 4834 } 4835 return (NULL); 4836 } 4837 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4838 /* We are not interested anymore */ 4839 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4840 ; 4841 } else if (stcb) { 4842#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4843 so = SCTP_INP_SO(inp); 4844 atomic_add_int(&stcb->asoc.refcnt, 1); 4845 SCTP_TCB_UNLOCK(stcb); 4846 SCTP_SOCKET_LOCK(so, 1); 4847 SCTP_TCB_LOCK(stcb); 4848 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4849#endif 4850 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4851#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4852 SCTP_SOCKET_UNLOCK(so, 1); 4853#endif 4854 *offset = length; 4855 return (NULL); 4856 } 4857 } 4858 /* He's alive so give him credit */ 4859 if ((stcb) && netp && *netp) { 4860 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4861 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4862 stcb->asoc.overall_error_count, 4863 0, 4864 SCTP_FROM_SCTP_INPUT, 4865 __LINE__); 4866 } 4867 stcb->asoc.overall_error_count = 0; 4868 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4869 } 4870 break; 4871 case SCTP_ECN_ECHO: 4872 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4873 /* He's alive so give him credit */ 4874 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4875 /* Its not ours */ 4876 if (locked_tcb) { 4877 SCTP_TCB_UNLOCK(locked_tcb); 4878 } 4879 *offset = length; 4880 return (NULL); 4881 } 4882 if (stcb) { 4883 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4884 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4885 stcb->asoc.overall_error_count, 4886 0, 4887 SCTP_FROM_SCTP_INPUT, 4888 __LINE__); 4889 } 4890 stcb->asoc.overall_error_count = 0; 4891 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4892 stcb); 4893 } 4894 break; 4895 case SCTP_ECN_CWR: 4896 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 4897 /* He's alive so give him credit */ 4898 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 4899 /* Its not ours */ 4900 if (locked_tcb) { 4901 SCTP_TCB_UNLOCK(locked_tcb); 4902 } 4903 *offset = length; 4904 return (NULL); 4905 } 4906 if (stcb) { 4907 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4908 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4909 stcb->asoc.overall_error_count, 4910 0, 4911 SCTP_FROM_SCTP_INPUT, 4912 __LINE__); 4913 } 4914 stcb->asoc.overall_error_count = 0; 4915 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4916 } 4917 break; 4918 case SCTP_SHUTDOWN_COMPLETE: 4919 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 4920 /* must be first and only chunk */ 4921 if ((num_chunks > 1) || 4922 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4923 *offset = length; 4924 if (locked_tcb) { 4925 SCTP_TCB_UNLOCK(locked_tcb); 4926 } 4927 return (NULL); 4928 } 4929 if ((stcb) && netp && *netp) { 4930 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4931 stcb, *netp); 4932 } 4933 *offset = length; 4934 return (NULL); 4935 break; 4936 case SCTP_ASCONF: 4937 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 4938 /* He's alive so give him credit */ 4939 if (stcb) { 4940 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4941 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4942 stcb->asoc.overall_error_count, 4943 0, 4944 SCTP_FROM_SCTP_INPUT, 4945 __LINE__); 4946 } 4947 stcb->asoc.overall_error_count = 0; 4948 sctp_handle_asconf(m, *offset, 4949 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 4950 asconf_cnt++; 4951 } 4952 break; 4953 case SCTP_ASCONF_ACK: 4954 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 4955 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 4956 /* Its not ours */ 4957 if (locked_tcb) { 4958 SCTP_TCB_UNLOCK(locked_tcb); 4959 } 4960 *offset = length; 4961 return (NULL); 4962 } 4963 if ((stcb) && netp && *netp) { 4964 /* He's alive so give him credit */ 4965 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4966 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4967 stcb->asoc.overall_error_count, 4968 0, 4969 SCTP_FROM_SCTP_INPUT, 4970 __LINE__); 4971 } 4972 stcb->asoc.overall_error_count = 0; 4973 sctp_handle_asconf_ack(m, *offset, 4974 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 4975 if (abort_no_unlock) 4976 return (NULL); 4977 } 4978 break; 4979 case SCTP_FORWARD_CUM_TSN: 4980 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 4981 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 4982 /* Its not ours */ 4983 if (locked_tcb) { 4984 SCTP_TCB_UNLOCK(locked_tcb); 4985 } 4986 *offset = length; 4987 return (NULL); 4988 } 4989 /* He's alive so give him credit */ 4990 if (stcb) { 4991 int abort_flag = 0; 4992 4993 stcb->asoc.overall_error_count = 0; 4994 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4995 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4996 stcb->asoc.overall_error_count, 4997 0, 4998 SCTP_FROM_SCTP_INPUT, 4999 __LINE__); 5000 } 5001 *fwd_tsn_seen = 1; 5002 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5003 /* We are not interested anymore */ 5004#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5005 so = SCTP_INP_SO(inp); 5006 atomic_add_int(&stcb->asoc.refcnt, 1); 5007 SCTP_TCB_UNLOCK(stcb); 5008 SCTP_SOCKET_LOCK(so, 1); 5009 SCTP_TCB_LOCK(stcb); 5010 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5011#endif 5012 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5013#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5014 SCTP_SOCKET_UNLOCK(so, 1); 5015#endif 5016 *offset = length; 5017 return (NULL); 5018 } 5019 sctp_handle_forward_tsn(stcb, 5020 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5021 if (abort_flag) { 5022 *offset = length; 5023 return (NULL); 5024 } else { 5025 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5026 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5027 stcb->asoc.overall_error_count, 5028 0, 5029 SCTP_FROM_SCTP_INPUT, 5030 __LINE__); 5031 } 5032 stcb->asoc.overall_error_count = 0; 5033 } 5034 5035 } 5036 break; 5037 case SCTP_STREAM_RESET: 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5039 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5040 /* Its not ours */ 5041 if (locked_tcb) { 5042 SCTP_TCB_UNLOCK(locked_tcb); 5043 } 5044 *offset = length; 5045 return (NULL); 5046 } 5047 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5048 /* We are not interested anymore */ 5049#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5050 so = SCTP_INP_SO(inp); 5051 atomic_add_int(&stcb->asoc.refcnt, 1); 5052 SCTP_TCB_UNLOCK(stcb); 5053 SCTP_SOCKET_LOCK(so, 1); 5054 SCTP_TCB_LOCK(stcb); 5055 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5056#endif 5057 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5058#if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5059 SCTP_SOCKET_UNLOCK(so, 1); 5060#endif 5061 *offset = length; 5062 return (NULL); 5063 } 5064 if (stcb->asoc.peer_supports_strreset == 0) { 5065 /* 5066 * hmm, peer should have announced this, but 5067 * we will turn it on since he is sending us 5068 * a stream reset. 5069 */ 5070 stcb->asoc.peer_supports_strreset = 1; 5071 } 5072 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 5073 /* stop processing */ 5074 *offset = length; 5075 return (NULL); 5076 } 5077 break; 5078 case SCTP_PACKET_DROPPED: 5079 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5080 /* re-get it all please */ 5081 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5082 /* Its not ours */ 5083 if (locked_tcb) { 5084 SCTP_TCB_UNLOCK(locked_tcb); 5085 } 5086 *offset = length; 5087 return (NULL); 5088 } 5089 if (ch && (stcb) && netp && (*netp)) { 5090 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5091 stcb, *netp, 5092 min(chk_length, (sizeof(chunk_buf) - 4))); 5093 5094 } 5095 break; 5096 5097 case SCTP_AUTHENTICATION: 5098 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5099 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5100 goto unknown_chunk; 5101 5102 if (stcb == NULL) { 5103 /* save the first AUTH for later processing */ 5104 if (auth_skipped == 0) { 5105 auth_offset = *offset; 5106 auth_len = chk_length; 5107 auth_skipped = 1; 5108 } 5109 /* skip this chunk (temporarily) */ 5110 goto next_chunk; 5111 } 5112 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5113 (chk_length > (sizeof(struct sctp_auth_chunk) + 5114 SCTP_AUTH_DIGEST_LEN_MAX))) { 5115 /* Its not ours */ 5116 if (locked_tcb) { 5117 SCTP_TCB_UNLOCK(locked_tcb); 5118 } 5119 *offset = length; 5120 return (NULL); 5121 } 5122 if (got_auth == 1) { 5123 /* skip this chunk... it's already auth'd */ 5124 goto next_chunk; 5125 } 5126 got_auth = 1; 5127 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5128 m, *offset)) { 5129 /* auth HMAC failed so dump the packet */ 5130 *offset = length; 5131 return (stcb); 5132 } else { 5133 /* remaining chunks are HMAC checked */ 5134 stcb->asoc.authenticated = 1; 5135 } 5136 break; 5137 5138 default: 5139 unknown_chunk: 5140 /* it's an unknown chunk! */ 5141 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5142 struct mbuf *mm; 5143 struct sctp_paramhdr *phd; 5144 5145 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5146 0, M_DONTWAIT, 1, MT_DATA); 5147 if (mm) { 5148 phd = mtod(mm, struct sctp_paramhdr *); 5149 /* 5150 * We cheat and use param type since 5151 * we did not bother to define a 5152 * error cause struct. They are the 5153 * same basic format with different 5154 * names. 5155 */ 5156 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5157 phd->param_length = htons(chk_length + sizeof(*phd)); 5158 SCTP_BUF_LEN(mm) = sizeof(*phd); 5159 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 5160 M_DONTWAIT); 5161 if (SCTP_BUF_NEXT(mm)) { 5162#ifdef SCTP_MBUF_LOGGING 5163 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5164 struct mbuf *mat; 5165 5166 mat = SCTP_BUF_NEXT(mm); 5167 while (mat) { 5168 if (SCTP_BUF_IS_EXTENDED(mat)) { 5169 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5170 } 5171 mat = SCTP_BUF_NEXT(mat); 5172 } 5173 } 5174#endif 5175 sctp_queue_op_err(stcb, mm); 5176 } else { 5177 sctp_m_freem(mm); 5178 } 5179 } 5180 } 5181 if ((ch->chunk_type & 0x80) == 0) { 5182 /* discard this packet */ 5183 *offset = length; 5184 return (stcb); 5185 } /* else skip this bad chunk and continue... */ 5186 break; 5187 } /* switch (ch->chunk_type) */ 5188 5189 5190next_chunk: 5191 /* get the next chunk */ 5192 *offset += SCTP_SIZE32(chk_length); 5193 if (*offset >= length) { 5194 /* no more data left in the mbuf chain */ 5195 break; 5196 } 5197 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5198 sizeof(struct sctp_chunkhdr), chunk_buf); 5199 if (ch == NULL) { 5200 if (locked_tcb) { 5201 SCTP_TCB_UNLOCK(locked_tcb); 5202 } 5203 *offset = length; 5204 return (NULL); 5205 } 5206 } /* while */ 5207 5208 if (asconf_cnt > 0 && stcb != NULL) { 5209 sctp_send_asconf_ack(stcb); 5210 } 5211 return (stcb); 5212} 5213 5214 5215/* 5216 * Process the ECN bits we have something set so we must look to see if it is 5217 * ECN(0) or ECN(1) or CE 5218 */ 5219static void 5220sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 5221 uint8_t ecn_bits) 5222{ 5223 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5224 ; 5225 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 5226 /* 5227 * we only add to the nonce sum for ECT1, ECT0 does not 5228 * change the NS bit (that we have yet to find a way to send 5229 * it yet). 5230 */ 5231 5232 /* ECN Nonce stuff */ 5233 stcb->asoc.receiver_nonce_sum++; 5234 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 5235 5236 /* 5237 * Drag up the last_echo point if cumack is larger since we 5238 * don't want the point falling way behind by more than 5239 * 2^^31 and then having it be incorrect. 5240 */ 5241 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5242 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5243 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5244 } 5245 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 5246 /* 5247 * Drag up the last_echo point if cumack is larger since we 5248 * don't want the point falling way behind by more than 5249 * 2^^31 and then having it be incorrect. 5250 */ 5251 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 5252 stcb->asoc.last_echo_tsn, MAX_TSN)) { 5253 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 5254 } 5255 } 5256} 5257 5258static void 5259sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 5260 uint32_t high_tsn, uint8_t ecn_bits) 5261{ 5262 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 5263 /* 5264 * we possibly must notify the sender that a congestion 5265 * window reduction is in order. We do this by adding a ECNE 5266 * chunk to the output chunk queue. The incoming CWR will 5267 * remove this chunk. 5268 */ 5269 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 5270 MAX_TSN)) { 5271 /* Yep, we need to add a ECNE */ 5272 sctp_send_ecn_echo(stcb, net, high_tsn); 5273 stcb->asoc.last_echo_tsn = high_tsn; 5274 } 5275 } 5276} 5277 5278#ifdef INVARIANTS 5279static void 5280sctp_validate_no_locks(struct sctp_inpcb *inp) 5281{ 5282 struct sctp_tcb *stcb; 5283 5284 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 5285 if (mtx_owned(&stcb->tcb_mtx)) { 5286 panic("Own lock on stcb at return from input"); 5287 } 5288 } 5289} 5290 5291#endif 5292 5293/* 5294 * common input chunk processing (v4 and v6) 5295 */ 5296void 5297sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 5298 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 5299 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 5300 uint8_t ecn_bits, uint32_t vrf_id, uint16_t port) 5301{ 5302 /* 5303 * Control chunk processing 5304 */ 5305 uint32_t high_tsn; 5306 int fwd_tsn_seen = 0, data_processed = 0; 5307 struct mbuf *m = *mm; 5308 int abort_flag = 0; 5309 int un_sent; 5310 5311 SCTP_STAT_INCR(sctps_recvdatagrams); 5312#ifdef SCTP_AUDITING_ENABLED 5313 sctp_audit_log(0xE0, 1); 5314 sctp_auditing(0, inp, stcb, net); 5315#endif 5316 5317 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5318 m, iphlen, offset, length, stcb); 5319 if (stcb) { 5320 /* always clear this before beginning a packet */ 5321 stcb->asoc.authenticated = 0; 5322 stcb->asoc.seen_a_sack_this_pkt = 0; 5323 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5324 stcb, stcb->asoc.state); 5325 5326 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5327 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5328 /*- 5329 * If we hit here, we had a ref count 5330 * up when the assoc was aborted and the 5331 * timer is clearing out the assoc, we should 5332 * NOT respond to any packet.. its OOTB. 5333 */ 5334 SCTP_TCB_UNLOCK(stcb); 5335 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5336 vrf_id, port); 5337 goto out_now; 5338 } 5339 } 5340 if (IS_SCTP_CONTROL(ch)) { 5341 /* process the control portion of the SCTP packet */ 5342 /* sa_ignore NO_NULL_CHK */ 5343 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 5344 inp, stcb, &net, &fwd_tsn_seen, vrf_id, port); 5345 if (stcb) { 5346 /* 5347 * This covers us if the cookie-echo was there and 5348 * it changes our INP. 5349 */ 5350 inp = stcb->sctp_ep; 5351 if ((net) && (port)) { 5352 if (net->port == 0) { 5353 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5354 } 5355 net->port = port; 5356 } 5357 } 5358 } else { 5359 /* 5360 * no control chunks, so pre-process DATA chunks (these 5361 * checks are taken care of by control processing) 5362 */ 5363 5364 /* 5365 * if DATA only packet, and auth is required, then punt... 5366 * can't have authenticated without any AUTH (control) 5367 * chunks 5368 */ 5369 if ((stcb != NULL) && 5370 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5371 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5372 /* "silently" ignore */ 5373 SCTP_STAT_INCR(sctps_recvauthmissing); 5374 SCTP_TCB_UNLOCK(stcb); 5375 goto out_now; 5376 } 5377 if (stcb == NULL) { 5378 /* out of the blue DATA chunk */ 5379 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5380 vrf_id, port); 5381 goto out_now; 5382 } 5383 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5384 /* v_tag mismatch! */ 5385 SCTP_STAT_INCR(sctps_badvtag); 5386 SCTP_TCB_UNLOCK(stcb); 5387 goto out_now; 5388 } 5389 } 5390 5391 if (stcb == NULL) { 5392 /* 5393 * no valid TCB for this packet, or we found it's a bad 5394 * packet while processing control, or we're done with this 5395 * packet (done or skip rest of data), so we drop it... 5396 */ 5397 goto out_now; 5398 } 5399 /* 5400 * DATA chunk processing 5401 */ 5402 /* plow through the data chunks while length > offset */ 5403 5404 /* 5405 * Rest should be DATA only. Check authentication state if AUTH for 5406 * DATA is required. 5407 */ 5408 if ((length > offset) && 5409 (stcb != NULL) && 5410 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5411 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5412 !stcb->asoc.authenticated) { 5413 /* "silently" ignore */ 5414 SCTP_STAT_INCR(sctps_recvauthmissing); 5415 SCTPDBG(SCTP_DEBUG_AUTH1, 5416 "Data chunk requires AUTH, skipped\n"); 5417 goto trigger_send; 5418 } 5419 if (length > offset) { 5420 int retval; 5421 5422 /* 5423 * First check to make sure our state is correct. We would 5424 * not get here unless we really did have a tag, so we don't 5425 * abort if this happens, just dump the chunk silently. 5426 */ 5427 switch (SCTP_GET_STATE(&stcb->asoc)) { 5428 case SCTP_STATE_COOKIE_ECHOED: 5429 /* 5430 * we consider data with valid tags in this state 5431 * shows us the cookie-ack was lost. Imply it was 5432 * there. 5433 */ 5434 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5435 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5436 stcb->asoc.overall_error_count, 5437 0, 5438 SCTP_FROM_SCTP_INPUT, 5439 __LINE__); 5440 } 5441 stcb->asoc.overall_error_count = 0; 5442 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5443 break; 5444 case SCTP_STATE_COOKIE_WAIT: 5445 /* 5446 * We consider OOTB any data sent during asoc setup. 5447 */ 5448 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 5449 vrf_id, port); 5450 SCTP_TCB_UNLOCK(stcb); 5451 goto out_now; 5452 /* sa_ignore NOTREACHED */ 5453 break; 5454 case SCTP_STATE_EMPTY: /* should not happen */ 5455 case SCTP_STATE_INUSE: /* should not happen */ 5456 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5457 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5458 default: 5459 SCTP_TCB_UNLOCK(stcb); 5460 goto out_now; 5461 /* sa_ignore NOTREACHED */ 5462 break; 5463 case SCTP_STATE_OPEN: 5464 case SCTP_STATE_SHUTDOWN_SENT: 5465 break; 5466 } 5467 /* take care of ECN, part 1. */ 5468 if (stcb->asoc.ecn_allowed && 5469 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5470 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 5471 } 5472 /* plow through the data chunks while length > offset */ 5473 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 5474 inp, stcb, net, &high_tsn); 5475 if (retval == 2) { 5476 /* 5477 * The association aborted, NO UNLOCK needed since 5478 * the association is destroyed. 5479 */ 5480 goto out_now; 5481 } 5482 data_processed = 1; 5483 if (retval == 0) { 5484 /* take care of ecn part 2. */ 5485 if (stcb->asoc.ecn_allowed && 5486 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 5487 sctp_process_ecn_marked_b(stcb, net, high_tsn, 5488 ecn_bits); 5489 } 5490 } 5491 /* 5492 * Anything important needs to have been m_copy'ed in 5493 * process_data 5494 */ 5495 } 5496 if ((data_processed == 0) && (fwd_tsn_seen)) { 5497 int was_a_gap = 0; 5498 5499 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 5500 stcb->asoc.cumulative_tsn, MAX_TSN)) { 5501 /* there was a gap before this data was processed */ 5502 was_a_gap = 1; 5503 } 5504 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 5505 if (abort_flag) { 5506 /* Again, we aborted so NO UNLOCK needed */ 5507 goto out_now; 5508 } 5509 } 5510 /* trigger send of any chunks in queue... */ 5511trigger_send: 5512#ifdef SCTP_AUDITING_ENABLED 5513 sctp_audit_log(0xE0, 2); 5514 sctp_auditing(1, inp, stcb, net); 5515#endif 5516 SCTPDBG(SCTP_DEBUG_INPUT1, 5517 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5518 stcb->asoc.peers_rwnd, 5519 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5520 stcb->asoc.total_flight); 5521 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5522 5523 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 5524 ((un_sent) && 5525 (stcb->asoc.peers_rwnd > 0 || 5526 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5527 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5528 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5529 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5530 } 5531#ifdef SCTP_AUDITING_ENABLED 5532 sctp_audit_log(0xE0, 3); 5533 sctp_auditing(2, inp, stcb, net); 5534#endif 5535 SCTP_TCB_UNLOCK(stcb); 5536out_now: 5537#ifdef INVARIANTS 5538 sctp_validate_no_locks(inp); 5539#endif 5540 return; 5541} 5542 5543#if 0 5544static void 5545sctp_print_mbuf_chain(struct mbuf *m) 5546{ 5547 for (; m; m = SCTP_BUF_NEXT(m)) { 5548 printf("%p: m_len = %ld\n", m, SCTP_BUF_LEN(m)); 5549 if (SCTP_BUF_IS_EXTENDED(m)) 5550 printf("%p: extend_size = %d\n", m, SCTP_BUF_EXTEND_SIZE(m)); 5551 } 5552} 5553 5554#endif 5555 5556void 5557sctp_input_with_port(i_pak, off, port) 5558 struct mbuf *i_pak; 5559 int off; 5560 uint16_t port; 5561{ 5562#ifdef SCTP_MBUF_LOGGING 5563 struct mbuf *mat; 5564 5565#endif 5566 struct mbuf *m; 5567 int iphlen; 5568 uint32_t vrf_id = 0; 5569 uint8_t ecn_bits; 5570 struct ip *ip; 5571 struct sctphdr *sh; 5572 struct sctp_inpcb *inp = NULL; 5573 5574 uint32_t check, calc_check; 5575 struct sctp_nets *net; 5576 struct sctp_tcb *stcb = NULL; 5577 struct sctp_chunkhdr *ch; 5578 int refcount_up = 0; 5579 int length, mlen, offset; 5580 5581 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5582 SCTP_RELEASE_PKT(i_pak); 5583 return; 5584 } 5585 mlen = SCTP_HEADER_LEN(i_pak); 5586 iphlen = off; 5587 m = SCTP_HEADER_TO_CHAIN(i_pak); 5588 5589 net = NULL; 5590 SCTP_STAT_INCR(sctps_recvpackets); 5591 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5592 5593 5594#ifdef SCTP_MBUF_LOGGING 5595 /* Log in any input mbufs */ 5596 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5597 mat = m; 5598 while (mat) { 5599 if (SCTP_BUF_IS_EXTENDED(mat)) { 5600 sctp_log_mb(mat, SCTP_MBUF_INPUT); 5601 } 5602 mat = SCTP_BUF_NEXT(mat); 5603 } 5604 } 5605#endif 5606#ifdef SCTP_PACKET_LOGGING 5607 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) 5608 sctp_packet_log(m, mlen); 5609#endif 5610 /* 5611 * Must take out the iphlen, since mlen expects this (only effect lb 5612 * case) 5613 */ 5614 mlen -= iphlen; 5615 5616 /* 5617 * Get IP, SCTP, and first chunk header together in first mbuf. 5618 */ 5619 ip = mtod(m, struct ip *); 5620 offset = iphlen + sizeof(*sh) + sizeof(*ch); 5621 if (SCTP_BUF_LEN(m) < offset) { 5622 if ((m = m_pullup(m, offset)) == 0) { 5623 SCTP_STAT_INCR(sctps_hdrops); 5624 return; 5625 } 5626 ip = mtod(m, struct ip *); 5627 } 5628 /* validate mbuf chain length with IP payload length */ 5629 if (mlen < (SCTP_GET_IPV4_LENGTH(ip) - iphlen)) { 5630 SCTP_STAT_INCR(sctps_hdrops); 5631 goto bad; 5632 } 5633 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5634 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 5635 SCTPDBG(SCTP_DEBUG_INPUT1, 5636 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 5637 5638 /* SCTP does not allow broadcasts or multicasts */ 5639 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 5640 goto bad; 5641 } 5642 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 5643 /* 5644 * We only look at broadcast if its a front state, All 5645 * others we will not have a tcb for anyway. 5646 */ 5647 goto bad; 5648 } 5649 /* validate SCTP checksum */ 5650 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5651 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 5652 m->m_pkthdr.len, 5653 if_name(m->m_pkthdr.rcvif), 5654 m->m_pkthdr.csum_flags); 5655 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5656 SCTP_STAT_INCR(sctps_recvhwcrc); 5657 goto sctp_skip_csum_4; 5658 } 5659 check = sh->checksum; /* save incoming checksum */ 5660 if ((check == 0) && (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback)) && 5661 ((ip->ip_src.s_addr == ip->ip_dst.s_addr) || 5662 (SCTP_IS_IT_LOOPBACK(m))) 5663 ) { 5664 SCTP_STAT_INCR(sctps_recvnocrc); 5665 goto sctp_skip_csum_4; 5666 } 5667 sh->checksum = 0; /* prepare for calc */ 5668 calc_check = sctp_calculate_cksum(m, iphlen); 5669 SCTP_STAT_INCR(sctps_recvswcrc); 5670 if (calc_check != check) { 5671 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5672 calc_check, check, m, mlen, iphlen); 5673 5674 stcb = sctp_findassociation_addr(m, iphlen, 5675 offset - sizeof(*ch), 5676 sh, ch, &inp, &net, 5677 vrf_id); 5678 if ((net) && (port)) { 5679 if (net->port == 0) { 5680 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5681 } 5682 net->port = port; 5683 } 5684 if ((inp) && (stcb)) { 5685 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 5686 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5687 } else if ((inp != NULL) && (stcb == NULL)) { 5688 refcount_up = 1; 5689 } 5690 SCTP_STAT_INCR(sctps_badsum); 5691 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5692 goto bad; 5693 } 5694 sh->checksum = calc_check; 5695sctp_skip_csum_4: 5696 /* destination port of 0 is illegal, based on RFC2960. */ 5697 if (sh->dest_port == 0) { 5698 SCTP_STAT_INCR(sctps_hdrops); 5699 goto bad; 5700 } 5701 /* 5702 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 5703 * IP/SCTP/first chunk header... 5704 */ 5705 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 5706 sh, ch, &inp, &net, vrf_id); 5707 if ((net) && (port)) { 5708 if (net->port == 0) { 5709 sctp_pathmtu_adjustment(inp, stcb, net, net->mtu - sizeof(struct udphdr)); 5710 } 5711 net->port = port; 5712 } 5713 /* inp's ref-count increased && stcb locked */ 5714 if (inp == NULL) { 5715 struct sctp_init_chunk *init_chk, chunk_buf; 5716 5717 SCTP_STAT_INCR(sctps_noport); 5718#ifdef ICMP_BANDLIM 5719 /* 5720 * we use the bandwidth limiting to protect against sending 5721 * too many ABORTS all at once. In this case these count the 5722 * same as an ICMP message. 5723 */ 5724 if (badport_bandlim(0) < 0) 5725 goto bad; 5726#endif /* ICMP_BANDLIM */ 5727 SCTPDBG(SCTP_DEBUG_INPUT1, 5728 "Sending a ABORT from packet entry!\n"); 5729 if (ch->chunk_type == SCTP_INITIATION) { 5730 /* 5731 * we do a trick here to get the INIT tag, dig in 5732 * and get the tag from the INIT and put it in the 5733 * common header. 5734 */ 5735 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 5736 iphlen + sizeof(*sh), sizeof(*init_chk), 5737 (uint8_t *) & chunk_buf); 5738 if (init_chk != NULL) 5739 sh->v_tag = init_chk->init.initiate_tag; 5740 } 5741 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5742 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id, port); 5743 goto bad; 5744 } 5745 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5746 goto bad; 5747 } 5748 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 5749 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id, port); 5750 goto bad; 5751 } else if (stcb == NULL) { 5752 refcount_up = 1; 5753 } 5754#ifdef IPSEC 5755 /* 5756 * I very much doubt any of the IPSEC stuff will work but I have no 5757 * idea, so I will leave it in place. 5758 */ 5759 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5760 MODULE_GLOBAL(MOD_IPSEC, ipsec4stat).in_polvio++; 5761 SCTP_STAT_INCR(sctps_hdrops); 5762 goto bad; 5763 } 5764#endif /* IPSEC */ 5765 5766 /* 5767 * common chunk processing 5768 */ 5769 length = ip->ip_len + iphlen; 5770 offset -= sizeof(struct sctp_chunkhdr); 5771 5772 ecn_bits = ip->ip_tos; 5773 5774 /* sa_ignore NO_NULL_CHK */ 5775 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5776 inp, stcb, net, ecn_bits, vrf_id, port); 5777 /* inp's ref-count reduced && stcb unlocked */ 5778 if (m) { 5779 sctp_m_freem(m); 5780 } 5781 if ((inp) && (refcount_up)) { 5782 /* reduce ref-count */ 5783 SCTP_INP_DECR_REF(inp); 5784 } 5785 return; 5786bad: 5787 if (stcb) { 5788 SCTP_TCB_UNLOCK(stcb); 5789 } 5790 if ((inp) && (refcount_up)) { 5791 /* reduce ref-count */ 5792 SCTP_INP_DECR_REF(inp); 5793 } 5794 if (m) { 5795 sctp_m_freem(m); 5796 } 5797 return; 5798} 5799void 5800sctp_input(i_pak, off) 5801 struct mbuf *i_pak; 5802 int off; 5803{ 5804 sctp_input_with_port(i_pak, off, 0); 5805} 5806