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