sctp_input.c revision 171745
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: head/sys/netinet/sctp_input.c 171745 2007-08-06 15:46:46Z rrs $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48 49 50 51static void 52sctp_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 */ 78static void 79sctp_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 170int 171sctp_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 230static int 231sctp_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 */ 366static int 367sctp_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 481static void 482sctp_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 585static void 586sctp_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 610static void 611sctp_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 691static void 692sctp_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 */ 751static void 752sctp_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 */ 779static void 780sctp_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 818static int 819sctp_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 938static int 939sctp_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 */ 1071static struct sctp_tcb * 1072sctp_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 */ 1551static struct sctp_tcb * 1552sctp_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 */ 1835static struct mbuf * 1836sctp_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 SCTP_TCB_UNLOCK((*stcb)); 2194 so = sonewconn(oso, 0 2195 ); 2196 SCTP_INP_WLOCK((*stcb)->sctp_ep); 2197 SCTP_TCB_LOCK((*stcb)); 2198 SCTP_INP_WUNLOCK((*stcb)->sctp_ep); 2199 if (so == NULL) { 2200 struct mbuf *op_err; 2201 2202 /* Too many sockets */ 2203 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2204 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2205 sctp_abort_association(*inp_p, NULL, m, iphlen, 2206 sh, op_err, vrf_id); 2207 sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2208 return (NULL); 2209 } 2210 inp = (struct sctp_inpcb *)so->so_pcb; 2211 SCTP_INP_INCR_REF(inp); 2212 /* 2213 * We add the unbound flag here so that if we get an 2214 * soabort() before we get the move_pcb done, we 2215 * will properly cleanup. 2216 */ 2217 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2218 SCTP_PCB_FLAGS_CONNECTED | 2219 SCTP_PCB_FLAGS_IN_TCPPOOL | 2220 SCTP_PCB_FLAGS_UNBOUND | 2221 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2222 SCTP_PCB_FLAGS_DONT_WAKE); 2223 inp->sctp_features = (*inp_p)->sctp_features; 2224 inp->sctp_socket = so; 2225 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2226 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2227 inp->sctp_context = (*inp_p)->sctp_context; 2228 inp->inp_starting_point_for_iterator = NULL; 2229 /* 2230 * copy in the authentication parameters from the 2231 * original endpoint 2232 */ 2233 if (inp->sctp_ep.local_hmacs) 2234 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2235 inp->sctp_ep.local_hmacs = 2236 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2237 if (inp->sctp_ep.local_auth_chunks) 2238 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2239 inp->sctp_ep.local_auth_chunks = 2240 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2241 (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys, 2242 &inp->sctp_ep.shared_keys); 2243 2244 /* 2245 * Now we must move it from one hash table to 2246 * another and get the tcb in the right place. 2247 */ 2248 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2249 2250 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2251 SCTP_TCB_UNLOCK((*stcb)); 2252 2253 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT); 2254 SCTP_TCB_LOCK((*stcb)); 2255 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2256 2257 2258 /* 2259 * now we must check to see if we were aborted while 2260 * the move was going on and the lock/unlock 2261 * happened. 2262 */ 2263 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2264 /* 2265 * yep it was, we leave the assoc attached 2266 * to the socket since the sctp_inpcb_free() 2267 * call will send an abort for us. 2268 */ 2269 SCTP_INP_DECR_REF(inp); 2270 return (NULL); 2271 } 2272 SCTP_INP_DECR_REF(inp); 2273 /* Switch over to the new guy */ 2274 *inp_p = inp; 2275 sctp_ulp_notify(notification, *stcb, 0, NULL); 2276 2277 /* 2278 * Pull it from the incomplete queue and wake the 2279 * guy 2280 */ 2281 soisconnected(so); 2282 return (m); 2283 } 2284 } 2285 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2286 sctp_ulp_notify(notification, *stcb, 0, NULL); 2287 } 2288 return (m); 2289} 2290 2291static void 2292sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2293 struct sctp_tcb *stcb, struct sctp_nets *net) 2294{ 2295 /* cp must not be used, others call this without a c-ack :-) */ 2296 struct sctp_association *asoc; 2297 2298 SCTPDBG(SCTP_DEBUG_INPUT2, 2299 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2300 if (stcb == NULL) 2301 return; 2302 2303 asoc = &stcb->asoc; 2304 2305 sctp_stop_all_cookie_timers(stcb); 2306 /* process according to association state */ 2307 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2308 /* state change only needed when I am in right state */ 2309 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2310 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2311 asoc->state = SCTP_STATE_OPEN | SCTP_STATE_SHUTDOWN_PENDING; 2312 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2313 stcb->sctp_ep, stcb, asoc->primary_destination); 2314 2315 } else { 2316 asoc->state = SCTP_STATE_OPEN; 2317 } 2318 /* update RTO */ 2319 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2320 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2321 if (asoc->overall_error_count == 0) { 2322 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2323 &asoc->time_entered, sctp_align_safe_nocopy); 2324 } 2325 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2326 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL); 2327 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2328 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2329 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2330 soisconnected(stcb->sctp_ep->sctp_socket); 2331 } 2332 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2333 stcb, net); 2334 /* 2335 * since we did not send a HB make sure we don't double 2336 * things 2337 */ 2338 net->hb_responded = 1; 2339 2340 if (stcb->asoc.sctp_autoclose_ticks && 2341 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2342 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2343 stcb->sctp_ep, stcb, NULL); 2344 } 2345 /* 2346 * send ASCONF if parameters are pending and ASCONFs are 2347 * allowed (eg. addresses changed when init/cookie echo were 2348 * in flight) 2349 */ 2350 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2351 (stcb->asoc.peer_supports_asconf) && 2352 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2353#ifdef SCTP_TIMER_BASED_ASCONF 2354 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2355 stcb->sctp_ep, stcb, 2356 stcb->asoc.primary_destination); 2357#else 2358 sctp_send_asconf(stcb, stcb->asoc.primary_destination); 2359#endif 2360 } 2361 } 2362 /* Toss the cookie if I can */ 2363 sctp_toss_old_cookies(stcb, asoc); 2364 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2365 /* Restart the timer if we have pending data */ 2366 struct sctp_tmit_chunk *chk; 2367 2368 chk = TAILQ_FIRST(&asoc->sent_queue); 2369 if (chk) { 2370 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2371 stcb, chk->whoTo); 2372 } 2373 } 2374} 2375 2376static void 2377sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2378 struct sctp_tcb *stcb) 2379{ 2380 struct sctp_nets *net; 2381 struct sctp_tmit_chunk *lchk; 2382 uint32_t tsn; 2383 2384 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2385 return; 2386 } 2387 SCTP_STAT_INCR(sctps_recvecne); 2388 tsn = ntohl(cp->tsn); 2389 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2390 /* Also we make sure we disable the nonce_wait */ 2391 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2392 if (lchk == NULL) { 2393 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2394 } else { 2395 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2396 } 2397 stcb->asoc.nonce_wait_for_ecne = 0; 2398 stcb->asoc.nonce_sum_check = 0; 2399 2400 /* Find where it was sent, if possible */ 2401 net = NULL; 2402 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2403 while (lchk) { 2404 if (lchk->rec.data.TSN_seq == tsn) { 2405 net = lchk->whoTo; 2406 break; 2407 } 2408 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2409 break; 2410 lchk = TAILQ_NEXT(lchk, sctp_next); 2411 } 2412 if (net == NULL) 2413 /* default is we use the primary */ 2414 net = stcb->asoc.primary_destination; 2415 2416 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2417 /* 2418 * JRS - Use the congestion control given in the pluggable 2419 * CC module 2420 */ 2421 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2422 /* 2423 * we reduce once every RTT. So we will only lower cwnd at 2424 * the next sending seq i.e. the resync_tsn. 2425 */ 2426 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2427 } 2428 /* 2429 * We always send a CWR this way if our previous one was lost our 2430 * peer will get an update, or if it is not time again to reduce we 2431 * still get the cwr to the peer. 2432 */ 2433 sctp_send_cwr(stcb, net, tsn); 2434} 2435 2436static void 2437sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2438{ 2439 /* 2440 * Here we get a CWR from the peer. We must look in the outqueue and 2441 * make sure that we have a covered ECNE in teh control chunk part. 2442 * If so remove it. 2443 */ 2444 struct sctp_tmit_chunk *chk; 2445 struct sctp_ecne_chunk *ecne; 2446 2447 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2448 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2449 continue; 2450 } 2451 /* 2452 * Look for and remove if it is the right TSN. Since there 2453 * is only ONE ECNE on the control queue at any one time we 2454 * don't need to worry about more than one! 2455 */ 2456 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2457 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2458 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2459 /* this covers this ECNE, we can remove it */ 2460 stcb->asoc.ecn_echo_cnt_onq--; 2461 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2462 sctp_next); 2463 if (chk->data) { 2464 sctp_m_freem(chk->data); 2465 chk->data = NULL; 2466 } 2467 stcb->asoc.ctrl_queue_cnt--; 2468 sctp_free_a_chunk(stcb, chk); 2469 break; 2470 } 2471 } 2472} 2473 2474static void 2475sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2476 struct sctp_tcb *stcb, struct sctp_nets *net) 2477{ 2478 struct sctp_association *asoc; 2479 2480 SCTPDBG(SCTP_DEBUG_INPUT2, 2481 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2482 if (stcb == NULL) 2483 return; 2484 2485 asoc = &stcb->asoc; 2486 /* process according to association state */ 2487 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2488 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2489 SCTP_TCB_UNLOCK(stcb); 2490 return; 2491 } 2492 /* notify upper layer protocol */ 2493 if (stcb->sctp_socket) { 2494 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 2495 /* are the queues empty? they should be */ 2496 if (!TAILQ_EMPTY(&asoc->send_queue) || 2497 !TAILQ_EMPTY(&asoc->sent_queue) || 2498 !TAILQ_EMPTY(&asoc->out_wheel)) { 2499 sctp_report_all_outbound(stcb, 0); 2500 } 2501 } 2502 /* stop the timer */ 2503 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2504 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 2505 /* free the TCB */ 2506 sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2507 return; 2508} 2509 2510static int 2511process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 2512 struct sctp_nets *net, uint8_t flg) 2513{ 2514 switch (desc->chunk_type) { 2515 case SCTP_DATA: 2516 /* find the tsn to resend (possibly */ 2517 { 2518 uint32_t tsn; 2519 struct sctp_tmit_chunk *tp1; 2520 2521 tsn = ntohl(desc->tsn_ifany); 2522 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2523 while (tp1) { 2524 if (tp1->rec.data.TSN_seq == tsn) { 2525 /* found it */ 2526 break; 2527 } 2528 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 2529 MAX_TSN)) { 2530 /* not found */ 2531 tp1 = NULL; 2532 break; 2533 } 2534 tp1 = TAILQ_NEXT(tp1, sctp_next); 2535 } 2536 if (tp1 == NULL) { 2537 /* 2538 * Do it the other way , aka without paying 2539 * attention to queue seq order. 2540 */ 2541 SCTP_STAT_INCR(sctps_pdrpdnfnd); 2542 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2543 while (tp1) { 2544 if (tp1->rec.data.TSN_seq == tsn) { 2545 /* found it */ 2546 break; 2547 } 2548 tp1 = TAILQ_NEXT(tp1, sctp_next); 2549 } 2550 } 2551 if (tp1 == NULL) { 2552 SCTP_STAT_INCR(sctps_pdrptsnnf); 2553 } 2554 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 2555 uint8_t *ddp; 2556 2557 if ((stcb->asoc.peers_rwnd == 0) && 2558 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 2559 SCTP_STAT_INCR(sctps_pdrpdiwnp); 2560 return (0); 2561 } 2562 if (stcb->asoc.peers_rwnd == 0 && 2563 (flg & SCTP_FROM_MIDDLE_BOX)) { 2564 SCTP_STAT_INCR(sctps_pdrpdizrw); 2565 return (0); 2566 } 2567 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 2568 sizeof(struct sctp_data_chunk)); 2569 { 2570 unsigned int iii; 2571 2572 for (iii = 0; iii < sizeof(desc->data_bytes); 2573 iii++) { 2574 if (ddp[iii] != desc->data_bytes[iii]) { 2575 SCTP_STAT_INCR(sctps_pdrpbadd); 2576 return (-1); 2577 } 2578 } 2579 } 2580 /* 2581 * We zero out the nonce so resync not 2582 * needed 2583 */ 2584 tp1->rec.data.ect_nonce = 0; 2585 2586 if (tp1->do_rtt) { 2587 /* 2588 * this guy had a RTO calculation 2589 * pending on it, cancel it 2590 */ 2591 tp1->do_rtt = 0; 2592 } 2593 SCTP_STAT_INCR(sctps_pdrpmark); 2594 if (tp1->sent != SCTP_DATAGRAM_RESEND) 2595 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2596 tp1->sent = SCTP_DATAGRAM_RESEND; 2597 /* 2598 * mark it as if we were doing a FR, since 2599 * we will be getting gap ack reports behind 2600 * the info from the router. 2601 */ 2602 tp1->rec.data.doing_fast_retransmit = 1; 2603 /* 2604 * mark the tsn with what sequences can 2605 * cause a new FR. 2606 */ 2607 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 2608 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 2609 } else { 2610 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 2611 } 2612 2613 /* restart the timer */ 2614 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2615 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 2616 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2617 stcb, tp1->whoTo); 2618 2619 /* fix counts and things */ 2620 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) { 2621 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 2622 tp1->whoTo->flight_size, 2623 tp1->book_size, 2624 (uintptr_t) stcb, 2625 tp1->rec.data.TSN_seq); 2626 } 2627 sctp_flight_size_decrease(tp1); 2628 sctp_total_flight_decrease(stcb, tp1); 2629 } { 2630 /* audit code */ 2631 unsigned int audit; 2632 2633 audit = 0; 2634 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 2635 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2636 audit++; 2637 } 2638 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 2639 sctp_next) { 2640 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2641 audit++; 2642 } 2643 if (audit != stcb->asoc.sent_queue_retran_cnt) { 2644 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 2645 audit, stcb->asoc.sent_queue_retran_cnt); 2646#ifndef SCTP_AUDITING_ENABLED 2647 stcb->asoc.sent_queue_retran_cnt = audit; 2648#endif 2649 } 2650 } 2651 } 2652 break; 2653 case SCTP_ASCONF: 2654 { 2655 struct sctp_tmit_chunk *asconf; 2656 2657 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 2658 sctp_next) { 2659 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 2660 break; 2661 } 2662 } 2663 if (asconf) { 2664 if (asconf->sent != SCTP_DATAGRAM_RESEND) 2665 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2666 asconf->sent = SCTP_DATAGRAM_RESEND; 2667 asconf->snd_count--; 2668 } 2669 } 2670 break; 2671 case SCTP_INITIATION: 2672 /* resend the INIT */ 2673 stcb->asoc.dropped_special_cnt++; 2674 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 2675 /* 2676 * If we can get it in, in a few attempts we do 2677 * this, otherwise we let the timer fire. 2678 */ 2679 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 2680 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 2681 sctp_send_initiate(stcb->sctp_ep, stcb); 2682 } 2683 break; 2684 case SCTP_SELECTIVE_ACK: 2685 /* resend the sack */ 2686 sctp_send_sack(stcb); 2687 break; 2688 case SCTP_HEARTBEAT_REQUEST: 2689 /* resend a demand HB */ 2690 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 2691 /* 2692 * Only retransmit if we KNOW we wont destroy the 2693 * tcb 2694 */ 2695 (void)sctp_send_hb(stcb, 1, net); 2696 } 2697 break; 2698 case SCTP_SHUTDOWN: 2699 sctp_send_shutdown(stcb, net); 2700 break; 2701 case SCTP_SHUTDOWN_ACK: 2702 sctp_send_shutdown_ack(stcb, net); 2703 break; 2704 case SCTP_COOKIE_ECHO: 2705 { 2706 struct sctp_tmit_chunk *cookie; 2707 2708 cookie = NULL; 2709 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 2710 sctp_next) { 2711 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 2712 break; 2713 } 2714 } 2715 if (cookie) { 2716 if (cookie->sent != SCTP_DATAGRAM_RESEND) 2717 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2718 cookie->sent = SCTP_DATAGRAM_RESEND; 2719 sctp_stop_all_cookie_timers(stcb); 2720 } 2721 } 2722 break; 2723 case SCTP_COOKIE_ACK: 2724 sctp_send_cookie_ack(stcb); 2725 break; 2726 case SCTP_ASCONF_ACK: 2727 /* resend last asconf ack */ 2728 sctp_send_asconf_ack(stcb, 1); 2729 break; 2730 case SCTP_FORWARD_CUM_TSN: 2731 send_forward_tsn(stcb, &stcb->asoc); 2732 break; 2733 /* can't do anything with these */ 2734 case SCTP_PACKET_DROPPED: 2735 case SCTP_INITIATION_ACK: /* this should not happen */ 2736 case SCTP_HEARTBEAT_ACK: 2737 case SCTP_ABORT_ASSOCIATION: 2738 case SCTP_OPERATION_ERROR: 2739 case SCTP_SHUTDOWN_COMPLETE: 2740 case SCTP_ECN_ECHO: 2741 case SCTP_ECN_CWR: 2742 default: 2743 break; 2744 } 2745 return (0); 2746} 2747 2748void 2749sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2750{ 2751 int i; 2752 uint16_t temp; 2753 2754 /* 2755 * We set things to 0xffff since this is the last delivered sequence 2756 * and we will be sending in 0 after the reset. 2757 */ 2758 2759 if (number_entries) { 2760 for (i = 0; i < number_entries; i++) { 2761 temp = ntohs(list[i]); 2762 if (temp >= stcb->asoc.streamincnt) { 2763 continue; 2764 } 2765 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 2766 } 2767 } else { 2768 list = NULL; 2769 for (i = 0; i < stcb->asoc.streamincnt; i++) { 2770 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 2771 } 2772 } 2773 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list); 2774} 2775 2776static void 2777sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2778{ 2779 int i; 2780 2781 if (number_entries == 0) { 2782 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 2783 stcb->asoc.strmout[i].next_sequence_sent = 0; 2784 } 2785 } else if (number_entries) { 2786 for (i = 0; i < number_entries; i++) { 2787 uint16_t temp; 2788 2789 temp = ntohs(list[i]); 2790 if (temp >= stcb->asoc.streamoutcnt) { 2791 /* no such stream */ 2792 continue; 2793 } 2794 stcb->asoc.strmout[temp].next_sequence_sent = 0; 2795 } 2796 } 2797 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list); 2798} 2799 2800 2801struct sctp_stream_reset_out_request * 2802sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 2803{ 2804 struct sctp_association *asoc; 2805 struct sctp_stream_reset_out_req *req; 2806 struct sctp_stream_reset_out_request *r; 2807 struct sctp_tmit_chunk *chk; 2808 int len, clen; 2809 2810 asoc = &stcb->asoc; 2811 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 2812 asoc->stream_reset_outstanding = 0; 2813 return (NULL); 2814 } 2815 if (stcb->asoc.str_reset == NULL) { 2816 asoc->stream_reset_outstanding = 0; 2817 return (NULL); 2818 } 2819 chk = stcb->asoc.str_reset; 2820 if (chk->data == NULL) { 2821 return (NULL); 2822 } 2823 if (bchk) { 2824 /* he wants a copy of the chk pointer */ 2825 *bchk = chk; 2826 } 2827 clen = chk->send_size; 2828 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 2829 r = &req->sr_req; 2830 if (ntohl(r->request_seq) == seq) { 2831 /* found it */ 2832 return (r); 2833 } 2834 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 2835 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 2836 /* move to the next one, there can only be a max of two */ 2837 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 2838 if (ntohl(r->request_seq) == seq) { 2839 return (r); 2840 } 2841 } 2842 /* that seq is not here */ 2843 return (NULL); 2844} 2845 2846static void 2847sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 2848{ 2849 struct sctp_association *asoc; 2850 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 2851 2852 if (stcb->asoc.str_reset == NULL) { 2853 return; 2854 } 2855 asoc = &stcb->asoc; 2856 2857 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 2858 TAILQ_REMOVE(&asoc->control_send_queue, 2859 chk, 2860 sctp_next); 2861 if (chk->data) { 2862 sctp_m_freem(chk->data); 2863 chk->data = NULL; 2864 } 2865 asoc->ctrl_queue_cnt--; 2866 sctp_free_a_chunk(stcb, chk); 2867 stcb->asoc.str_reset = NULL; 2868} 2869 2870 2871static int 2872sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 2873 uint32_t seq, uint32_t action, 2874 struct sctp_stream_reset_response *respin) 2875{ 2876 uint16_t type; 2877 int lparm_len; 2878 struct sctp_association *asoc = &stcb->asoc; 2879 struct sctp_tmit_chunk *chk; 2880 struct sctp_stream_reset_out_request *srparam; 2881 int number_entries; 2882 2883 if (asoc->stream_reset_outstanding == 0) { 2884 /* duplicate */ 2885 return (0); 2886 } 2887 if (seq == stcb->asoc.str_reset_seq_out) { 2888 srparam = sctp_find_stream_reset(stcb, seq, &chk); 2889 if (srparam) { 2890 stcb->asoc.str_reset_seq_out++; 2891 type = ntohs(srparam->ph.param_type); 2892 lparm_len = ntohs(srparam->ph.param_length); 2893 if (type == SCTP_STR_RESET_OUT_REQUEST) { 2894 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 2895 asoc->stream_reset_out_is_outstanding = 0; 2896 if (asoc->stream_reset_outstanding) 2897 asoc->stream_reset_outstanding--; 2898 if (action == SCTP_STREAM_RESET_PERFORMED) { 2899 /* do it */ 2900 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 2901 } else { 2902 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams); 2903 } 2904 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 2905 /* Answered my request */ 2906 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 2907 if (asoc->stream_reset_outstanding) 2908 asoc->stream_reset_outstanding--; 2909 if (action != SCTP_STREAM_RESET_PERFORMED) { 2910 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams); 2911 } 2912 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 2913 /** 2914 * a) Adopt the new in tsn. 2915 * b) reset the map 2916 * c) Adopt the new out-tsn 2917 */ 2918 struct sctp_stream_reset_response_tsn *resp; 2919 struct sctp_forward_tsn_chunk fwdtsn; 2920 int abort_flag = 0; 2921 2922 if (respin == NULL) { 2923 /* huh ? */ 2924 return (0); 2925 } 2926 if (action == SCTP_STREAM_RESET_PERFORMED) { 2927 resp = (struct sctp_stream_reset_response_tsn *)respin; 2928 asoc->stream_reset_outstanding--; 2929 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2930 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2931 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 2932 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 2933 if (abort_flag) { 2934 return (1); 2935 } 2936 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 2937 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2938 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 2939 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2940 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 2941 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 2942 2943 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2944 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2945 2946 } 2947 } 2948 /* get rid of the request and get the request flags */ 2949 if (asoc->stream_reset_outstanding == 0) { 2950 sctp_clean_up_stream_reset(stcb); 2951 } 2952 } 2953 } 2954 return (0); 2955} 2956 2957static void 2958sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 2959 struct sctp_tmit_chunk *chk, 2960 struct sctp_stream_reset_in_request *req, int trunc) 2961{ 2962 uint32_t seq; 2963 int len, i; 2964 int number_entries; 2965 uint16_t temp; 2966 2967 /* 2968 * peer wants me to send a str-reset to him for my outgoing seq's if 2969 * seq_in is right. 2970 */ 2971 struct sctp_association *asoc = &stcb->asoc; 2972 2973 seq = ntohl(req->request_seq); 2974 if (asoc->str_reset_seq_in == seq) { 2975 if (trunc) { 2976 /* Can't do it, since they exceeded our buffer size */ 2977 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2978 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 2979 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2980 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 2981 len = ntohs(req->ph.param_length); 2982 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 2983 for (i = 0; i < number_entries; i++) { 2984 temp = ntohs(req->list_of_streams[i]); 2985 req->list_of_streams[i] = temp; 2986 } 2987 /* move the reset action back one */ 2988 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2989 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2990 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 2991 asoc->str_reset_seq_out, 2992 seq, (asoc->sending_seq - 1)); 2993 asoc->stream_reset_out_is_outstanding = 1; 2994 asoc->str_reset = chk; 2995 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2996 stcb->asoc.stream_reset_outstanding++; 2997 } else { 2998 /* Can't do it, since we have sent one out */ 2999 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3000 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 3001 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3002 } 3003 asoc->str_reset_seq_in++; 3004 } else if (asoc->str_reset_seq_in - 1 == seq) { 3005 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3006 } else if (asoc->str_reset_seq_in - 2 == seq) { 3007 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3008 } else { 3009 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3010 } 3011} 3012 3013static int 3014sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3015 struct sctp_tmit_chunk *chk, 3016 struct sctp_stream_reset_tsn_request *req) 3017{ 3018 /* reset all in and out and update the tsn */ 3019 /* 3020 * A) reset my str-seq's on in and out. B) Select a receive next, 3021 * and set cum-ack to it. Also process this selected number as a 3022 * fwd-tsn as well. C) set in the response my next sending seq. 3023 */ 3024 struct sctp_forward_tsn_chunk fwdtsn; 3025 struct sctp_association *asoc = &stcb->asoc; 3026 int abort_flag = 0; 3027 uint32_t seq; 3028 3029 seq = ntohl(req->request_seq); 3030 if (asoc->str_reset_seq_in == seq) { 3031 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3032 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3033 fwdtsn.ch.chunk_flags = 0; 3034 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3035 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3036 if (abort_flag) { 3037 return (1); 3038 } 3039 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3040 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3041 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3042 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3043 atomic_add_int(&stcb->asoc.sending_seq, 1); 3044 /* save off historical data for retrans */ 3045 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3046 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3047 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3048 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3049 3050 sctp_add_stream_reset_result_tsn(chk, 3051 ntohl(req->request_seq), 3052 SCTP_STREAM_RESET_PERFORMED, 3053 stcb->asoc.sending_seq, 3054 stcb->asoc.mapping_array_base_tsn); 3055 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3056 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3057 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3058 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3059 3060 asoc->str_reset_seq_in++; 3061 } else if (asoc->str_reset_seq_in - 1 == seq) { 3062 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3063 stcb->asoc.last_sending_seq[0], 3064 stcb->asoc.last_base_tsnsent[0] 3065 ); 3066 } else if (asoc->str_reset_seq_in - 2 == seq) { 3067 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3068 stcb->asoc.last_sending_seq[1], 3069 stcb->asoc.last_base_tsnsent[1] 3070 ); 3071 } else { 3072 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3073 } 3074 return (0); 3075} 3076 3077static void 3078sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3079 struct sctp_tmit_chunk *chk, 3080 struct sctp_stream_reset_out_request *req, int trunc) 3081{ 3082 uint32_t seq, tsn; 3083 int number_entries, len; 3084 struct sctp_association *asoc = &stcb->asoc; 3085 3086 seq = ntohl(req->request_seq); 3087 3088 /* now if its not a duplicate we process it */ 3089 if (asoc->str_reset_seq_in == seq) { 3090 len = ntohs(req->ph.param_length); 3091 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3092 /* 3093 * the sender is resetting, handle the list issue.. we must 3094 * a) verify if we can do the reset, if so no problem b) If 3095 * we can't do the reset we must copy the request. c) queue 3096 * it, and setup the data in processor to trigger it off 3097 * when needed and dequeue all the queued data. 3098 */ 3099 tsn = ntohl(req->send_reset_at_tsn); 3100 3101 /* move the reset action back one */ 3102 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3103 if (trunc) { 3104 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3105 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3106 } else if ((tsn == asoc->cumulative_tsn) || 3107 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3108 /* we can do it now */ 3109 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3110 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3111 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3112 } else { 3113 /* 3114 * we must queue it up and thus wait for the TSN's 3115 * to arrive that are at or before tsn 3116 */ 3117 struct sctp_stream_reset_list *liste; 3118 int siz; 3119 3120 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3121 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3122 siz, SCTP_M_STRESET); 3123 if (liste == NULL) { 3124 /* gak out of memory */ 3125 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3126 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3127 return; 3128 } 3129 liste->tsn = tsn; 3130 liste->number_entries = number_entries; 3131 memcpy(&liste->req, req, 3132 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3133 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3134 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3135 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3136 } 3137 asoc->str_reset_seq_in++; 3138 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3139 /* 3140 * one seq back, just echo back last action since my 3141 * response was lost. 3142 */ 3143 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3144 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3145 /* 3146 * two seq back, just echo back last action since my 3147 * response was lost. 3148 */ 3149 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3150 } else { 3151 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3152 } 3153} 3154 3155#ifdef __GNUC__ 3156__attribute__((noinline)) 3157#endif 3158 static int 3159 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3160 struct sctp_stream_reset_out_req *sr_req) 3161{ 3162 int chk_length, param_len, ptype; 3163 struct sctp_paramhdr pstore; 3164 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3165 3166 uint32_t seq; 3167 int num_req = 0; 3168 int trunc = 0; 3169 struct sctp_tmit_chunk *chk; 3170 struct sctp_chunkhdr *ch; 3171 struct sctp_paramhdr *ph; 3172 int ret_code = 0; 3173 int num_param = 0; 3174 3175 /* now it may be a reset or a reset-response */ 3176 chk_length = ntohs(sr_req->ch.chunk_length); 3177 3178 /* setup for adding the response */ 3179 sctp_alloc_a_chunk(stcb, chk); 3180 if (chk == NULL) { 3181 return (ret_code); 3182 } 3183 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3184 chk->rec.chunk_id.can_take_data = 0; 3185 chk->asoc = &stcb->asoc; 3186 chk->no_fr_allowed = 0; 3187 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3188 chk->book_size_scale = 0; 3189 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3190 if (chk->data == NULL) { 3191strres_nochunk: 3192 if (chk->data) { 3193 sctp_m_freem(chk->data); 3194 chk->data = NULL; 3195 } 3196 sctp_free_a_chunk(stcb, chk); 3197 return (ret_code); 3198 } 3199 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3200 3201 /* setup chunk parameters */ 3202 chk->sent = SCTP_DATAGRAM_UNSENT; 3203 chk->snd_count = 0; 3204 chk->whoTo = stcb->asoc.primary_destination; 3205 atomic_add_int(&chk->whoTo->ref_count, 1); 3206 3207 ch = mtod(chk->data, struct sctp_chunkhdr *); 3208 ch->chunk_type = SCTP_STREAM_RESET; 3209 ch->chunk_flags = 0; 3210 ch->chunk_length = htons(chk->send_size); 3211 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3212 offset += sizeof(struct sctp_chunkhdr); 3213 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3214 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3215 if (ph == NULL) 3216 break; 3217 param_len = ntohs(ph->param_length); 3218 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3219 /* bad param */ 3220 break; 3221 } 3222 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3223 (uint8_t *) & cstore); 3224 ptype = ntohs(ph->param_type); 3225 num_param++; 3226 if (param_len > (int)sizeof(cstore)) { 3227 trunc = 1; 3228 } else { 3229 trunc = 0; 3230 } 3231 3232 if (num_param > SCTP_MAX_RESET_PARAMS) { 3233 /* hit the max of parameters already sorry.. */ 3234 break; 3235 } 3236 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3237 struct sctp_stream_reset_out_request *req_out; 3238 3239 req_out = (struct sctp_stream_reset_out_request *)ph; 3240 num_req++; 3241 if (stcb->asoc.stream_reset_outstanding) { 3242 seq = ntohl(req_out->response_seq); 3243 if (seq == stcb->asoc.str_reset_seq_out) { 3244 /* implicit ack */ 3245 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3246 } 3247 } 3248 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3249 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3250 struct sctp_stream_reset_in_request *req_in; 3251 3252 num_req++; 3253 3254 req_in = (struct sctp_stream_reset_in_request *)ph; 3255 3256 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3257 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3258 struct sctp_stream_reset_tsn_request *req_tsn; 3259 3260 num_req++; 3261 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3262 3263 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3264 ret_code = 1; 3265 goto strres_nochunk; 3266 } 3267 /* no more */ 3268 break; 3269 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3270 struct sctp_stream_reset_response *resp; 3271 uint32_t result; 3272 3273 resp = (struct sctp_stream_reset_response *)ph; 3274 seq = ntohl(resp->response_seq); 3275 result = ntohl(resp->result); 3276 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3277 ret_code = 1; 3278 goto strres_nochunk; 3279 } 3280 } else { 3281 break; 3282 } 3283 offset += SCTP_SIZE32(param_len); 3284 chk_length -= SCTP_SIZE32(param_len); 3285 } 3286 if (num_req == 0) { 3287 /* we have no response free the stuff */ 3288 goto strres_nochunk; 3289 } 3290 /* ok we have a chunk to link in */ 3291 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3292 chk, 3293 sctp_next); 3294 stcb->asoc.ctrl_queue_cnt++; 3295 return (ret_code); 3296} 3297 3298/* 3299 * Handle a router or endpoints report of a packet loss, there are two ways 3300 * to handle this, either we get the whole packet and must disect it 3301 * ourselves (possibly with truncation and or corruption) or it is a summary 3302 * from a middle box that did the disectting for us. 3303 */ 3304static void 3305sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3306 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3307{ 3308 uint32_t bottle_bw, on_queue; 3309 uint16_t trunc_len; 3310 unsigned int chlen; 3311 unsigned int at; 3312 struct sctp_chunk_desc desc; 3313 struct sctp_chunkhdr *ch; 3314 3315 chlen = ntohs(cp->ch.chunk_length); 3316 chlen -= sizeof(struct sctp_pktdrop_chunk); 3317 /* XXX possible chlen underflow */ 3318 if (chlen == 0) { 3319 ch = NULL; 3320 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3321 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3322 } else { 3323 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3324 chlen -= sizeof(struct sctphdr); 3325 /* XXX possible chlen underflow */ 3326 memset(&desc, 0, sizeof(desc)); 3327 } 3328 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3329 if (trunc_len > limit) { 3330 trunc_len = limit; 3331 } 3332 /* now the chunks themselves */ 3333 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3334 desc.chunk_type = ch->chunk_type; 3335 /* get amount we need to move */ 3336 at = ntohs(ch->chunk_length); 3337 if (at < sizeof(struct sctp_chunkhdr)) { 3338 /* corrupt chunk, maybe at the end? */ 3339 SCTP_STAT_INCR(sctps_pdrpcrupt); 3340 break; 3341 } 3342 if (trunc_len == 0) { 3343 /* we are supposed to have all of it */ 3344 if (at > chlen) { 3345 /* corrupt skip it */ 3346 SCTP_STAT_INCR(sctps_pdrpcrupt); 3347 break; 3348 } 3349 } else { 3350 /* is there enough of it left ? */ 3351 if (desc.chunk_type == SCTP_DATA) { 3352 if (chlen < (sizeof(struct sctp_data_chunk) + 3353 sizeof(desc.data_bytes))) { 3354 break; 3355 } 3356 } else { 3357 if (chlen < sizeof(struct sctp_chunkhdr)) { 3358 break; 3359 } 3360 } 3361 } 3362 if (desc.chunk_type == SCTP_DATA) { 3363 /* can we get out the tsn? */ 3364 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3365 SCTP_STAT_INCR(sctps_pdrpmbda); 3366 3367 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3368 /* yep */ 3369 struct sctp_data_chunk *dcp; 3370 uint8_t *ddp; 3371 unsigned int iii; 3372 3373 dcp = (struct sctp_data_chunk *)ch; 3374 ddp = (uint8_t *) (dcp + 1); 3375 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3376 desc.data_bytes[iii] = ddp[iii]; 3377 } 3378 desc.tsn_ifany = dcp->dp.tsn; 3379 } else { 3380 /* nope we are done. */ 3381 SCTP_STAT_INCR(sctps_pdrpnedat); 3382 break; 3383 } 3384 } else { 3385 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3386 SCTP_STAT_INCR(sctps_pdrpmbct); 3387 } 3388 3389 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3390 SCTP_STAT_INCR(sctps_pdrppdbrk); 3391 break; 3392 } 3393 if (SCTP_SIZE32(at) > chlen) { 3394 break; 3395 } 3396 chlen -= SCTP_SIZE32(at); 3397 if (chlen < sizeof(struct sctp_chunkhdr)) { 3398 /* done, none left */ 3399 break; 3400 } 3401 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3402 } 3403 /* Now update any rwnd --- possibly */ 3404 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3405 /* From a peer, we get a rwnd report */ 3406 uint32_t a_rwnd; 3407 3408 SCTP_STAT_INCR(sctps_pdrpfehos); 3409 3410 bottle_bw = ntohl(cp->bottle_bw); 3411 on_queue = ntohl(cp->current_onq); 3412 if (bottle_bw && on_queue) { 3413 /* a rwnd report is in here */ 3414 if (bottle_bw > on_queue) 3415 a_rwnd = bottle_bw - on_queue; 3416 else 3417 a_rwnd = 0; 3418 3419 if (a_rwnd == 0) 3420 stcb->asoc.peers_rwnd = 0; 3421 else { 3422 if (a_rwnd > stcb->asoc.total_flight) { 3423 stcb->asoc.peers_rwnd = 3424 a_rwnd - stcb->asoc.total_flight; 3425 } else { 3426 stcb->asoc.peers_rwnd = 0; 3427 } 3428 if (stcb->asoc.peers_rwnd < 3429 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3430 /* SWS sender side engages */ 3431 stcb->asoc.peers_rwnd = 0; 3432 } 3433 } 3434 } 3435 } else { 3436 SCTP_STAT_INCR(sctps_pdrpfmbox); 3437 } 3438 3439 /* now middle boxes in sat networks get a cwnd bump */ 3440 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3441 (stcb->asoc.sat_t3_loss_recovery == 0) && 3442 (stcb->asoc.sat_network)) { 3443 /* 3444 * This is debateable but for sat networks it makes sense 3445 * Note if a T3 timer has went off, we will prohibit any 3446 * changes to cwnd until we exit the t3 loss recovery. 3447 */ 3448 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 3449 net, cp, &bottle_bw, &on_queue); 3450 } 3451} 3452 3453/* 3454 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 3455 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 3456 * offset: offset into the mbuf chain to first chunkhdr - length: is the 3457 * length of the complete packet outputs: - length: modified to remaining 3458 * length after control processing - netp: modified to new sctp_nets after 3459 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 3460 * bad packet,...) otherwise return the tcb for this packet 3461 */ 3462#ifdef __GNUC__ 3463__attribute__((noinline)) 3464#endif 3465 static struct sctp_tcb * 3466 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 3467 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 3468 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 3469 uint32_t vrf_id) 3470{ 3471 struct sctp_association *asoc; 3472 uint32_t vtag_in; 3473 int num_chunks = 0; /* number of control chunks processed */ 3474 uint32_t chk_length; 3475 int ret; 3476 int abort_no_unlock = 0; 3477 3478 /* 3479 * How big should this be, and should it be alloc'd? Lets try the 3480 * d-mtu-ceiling for now (2k) and that should hopefully work ... 3481 * until we get into jumbo grams and such.. 3482 */ 3483 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 3484 struct sctp_tcb *locked_tcb = stcb; 3485 int got_auth = 0; 3486 uint32_t auth_offset = 0, auth_len = 0; 3487 int auth_skipped = 0; 3488 3489 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 3490 iphlen, *offset, length, stcb); 3491 3492 /* validate chunk header length... */ 3493 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 3494 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 3495 ntohs(ch->chunk_length)); 3496 if (locked_tcb) { 3497 SCTP_TCB_UNLOCK(locked_tcb); 3498 } 3499 return (NULL); 3500 } 3501 /* 3502 * validate the verification tag 3503 */ 3504 vtag_in = ntohl(sh->v_tag); 3505 3506 if (locked_tcb) { 3507 SCTP_TCB_LOCK_ASSERT(locked_tcb); 3508 } 3509 if (ch->chunk_type == SCTP_INITIATION) { 3510 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 3511 ntohs(ch->chunk_length), vtag_in); 3512 if (vtag_in != 0) { 3513 /* protocol error- silently discard... */ 3514 SCTP_STAT_INCR(sctps_badvtag); 3515 if (locked_tcb) { 3516 SCTP_TCB_UNLOCK(locked_tcb); 3517 } 3518 return (NULL); 3519 } 3520 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 3521 /* 3522 * If there is no stcb, skip the AUTH chunk and process 3523 * later after a stcb is found (to validate the lookup was 3524 * valid. 3525 */ 3526 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 3527 (stcb == NULL) && !sctp_auth_disable) { 3528 /* save this chunk for later processing */ 3529 auth_skipped = 1; 3530 auth_offset = *offset; 3531 auth_len = ntohs(ch->chunk_length); 3532 3533 /* (temporarily) move past this chunk */ 3534 *offset += SCTP_SIZE32(auth_len); 3535 if (*offset >= length) { 3536 /* no more data left in the mbuf chain */ 3537 *offset = length; 3538 if (locked_tcb) { 3539 SCTP_TCB_UNLOCK(locked_tcb); 3540 } 3541 return (NULL); 3542 } 3543 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3544 sizeof(struct sctp_chunkhdr), chunk_buf); 3545 } 3546 if (ch == NULL) { 3547 /* Help */ 3548 *offset = length; 3549 if (locked_tcb) { 3550 SCTP_TCB_UNLOCK(locked_tcb); 3551 } 3552 return (NULL); 3553 } 3554 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 3555 goto process_control_chunks; 3556 } 3557 /* 3558 * first check if it's an ASCONF with an unknown src addr we 3559 * need to look inside to find the association 3560 */ 3561 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 3562 /* inp's refcount may be reduced */ 3563 SCTP_INP_INCR_REF(inp); 3564 3565 stcb = sctp_findassociation_ep_asconf(m, iphlen, 3566 *offset, sh, &inp, netp); 3567 if (stcb == NULL) { 3568 /* 3569 * reduce inp's refcount if not reduced in 3570 * sctp_findassociation_ep_asconf(). 3571 */ 3572 SCTP_INP_DECR_REF(inp); 3573 } 3574 /* now go back and verify any auth chunk to be sure */ 3575 if (auth_skipped && (stcb != NULL)) { 3576 struct sctp_auth_chunk *auth; 3577 3578 auth = (struct sctp_auth_chunk *) 3579 sctp_m_getptr(m, auth_offset, 3580 auth_len, chunk_buf); 3581 got_auth = 1; 3582 auth_skipped = 0; 3583 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 3584 auth_offset)) { 3585 /* auth HMAC failed so dump it */ 3586 *offset = length; 3587 if (locked_tcb) { 3588 SCTP_TCB_UNLOCK(locked_tcb); 3589 } 3590 return (NULL); 3591 } else { 3592 /* remaining chunks are HMAC checked */ 3593 stcb->asoc.authenticated = 1; 3594 } 3595 } 3596 } 3597 if (stcb == NULL) { 3598 /* no association, so it's out of the blue... */ 3599 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 3600 vrf_id); 3601 *offset = length; 3602 if (locked_tcb) { 3603 SCTP_TCB_UNLOCK(locked_tcb); 3604 } 3605 return (NULL); 3606 } 3607 asoc = &stcb->asoc; 3608 /* ABORT and SHUTDOWN can use either v_tag... */ 3609 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 3610 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 3611 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 3612 if ((vtag_in == asoc->my_vtag) || 3613 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 3614 (vtag_in == asoc->peer_vtag))) { 3615 /* this is valid */ 3616 } else { 3617 /* drop this packet... */ 3618 SCTP_STAT_INCR(sctps_badvtag); 3619 if (locked_tcb) { 3620 SCTP_TCB_UNLOCK(locked_tcb); 3621 } 3622 return (NULL); 3623 } 3624 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 3625 if (vtag_in != asoc->my_vtag) { 3626 /* 3627 * this could be a stale SHUTDOWN-ACK or the 3628 * peer never got the SHUTDOWN-COMPLETE and 3629 * is still hung; we have started a new asoc 3630 * but it won't complete until the shutdown 3631 * is completed 3632 */ 3633 if (locked_tcb) { 3634 SCTP_TCB_UNLOCK(locked_tcb); 3635 } 3636 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 3637 NULL, vrf_id); 3638 return (NULL); 3639 } 3640 } else { 3641 /* for all other chunks, vtag must match */ 3642 if (vtag_in != asoc->my_vtag) { 3643 /* invalid vtag... */ 3644 SCTPDBG(SCTP_DEBUG_INPUT3, 3645 "invalid vtag: %xh, expect %xh\n", 3646 vtag_in, asoc->my_vtag); 3647 SCTP_STAT_INCR(sctps_badvtag); 3648 if (locked_tcb) { 3649 SCTP_TCB_UNLOCK(locked_tcb); 3650 } 3651 *offset = length; 3652 return (NULL); 3653 } 3654 } 3655 } /* end if !SCTP_COOKIE_ECHO */ 3656 /* 3657 * process all control chunks... 3658 */ 3659 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 3660 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 3661 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 3662 /* implied cookie-ack.. we must have lost the ack */ 3663 stcb->asoc.overall_error_count = 0; 3664 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 3665 *netp); 3666 } 3667process_control_chunks: 3668 while (IS_SCTP_CONTROL(ch)) { 3669 /* validate chunk length */ 3670 chk_length = ntohs(ch->chunk_length); 3671 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 3672 ch->chunk_type, chk_length); 3673 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 3674 if (chk_length < sizeof(*ch) || 3675 (*offset + (int)chk_length) > length) { 3676 *offset = length; 3677 if (locked_tcb) { 3678 SCTP_TCB_UNLOCK(locked_tcb); 3679 } 3680 return (NULL); 3681 } 3682 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 3683 /* 3684 * INIT-ACK only gets the init ack "header" portion only 3685 * because we don't have to process the peer's COOKIE. All 3686 * others get a complete chunk. 3687 */ 3688 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 3689 (ch->chunk_type == SCTP_INITIATION)) { 3690 /* get an init-ack chunk */ 3691 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3692 sizeof(struct sctp_init_ack_chunk), chunk_buf); 3693 if (ch == NULL) { 3694 *offset = length; 3695 if (locked_tcb) { 3696 SCTP_TCB_UNLOCK(locked_tcb); 3697 } 3698 return (NULL); 3699 } 3700 } else { 3701 /* For cookies and all other chunks. */ 3702 if (chk_length > sizeof(chunk_buf)) { 3703 /* 3704 * use just the size of the chunk buffer so 3705 * the front part of our chunks fit in 3706 * contiguous space up to the chunk buffer 3707 * size (508 bytes). For chunks that need to 3708 * get more than that they must use the 3709 * sctp_m_getptr() function or other means 3710 * (e.g. know how to parse mbuf chains). 3711 * Cookies do this already. 3712 */ 3713 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3714 (sizeof(chunk_buf) - 4), 3715 chunk_buf); 3716 if (ch == NULL) { 3717 *offset = length; 3718 if (locked_tcb) { 3719 SCTP_TCB_UNLOCK(locked_tcb); 3720 } 3721 return (NULL); 3722 } 3723 } else { 3724 /* We can fit it all */ 3725 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3726 chk_length, chunk_buf); 3727 if (ch == NULL) { 3728 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 3729 *offset = length; 3730 if (locked_tcb) { 3731 SCTP_TCB_UNLOCK(locked_tcb); 3732 } 3733 return (NULL); 3734 } 3735 } 3736 } 3737 num_chunks++; 3738 /* Save off the last place we got a control from */ 3739 if (stcb != NULL) { 3740 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 3741 /* 3742 * allow last_control to be NULL if 3743 * ASCONF... ASCONF processing will find the 3744 * right net later 3745 */ 3746 if ((netp != NULL) && (*netp != NULL)) 3747 stcb->asoc.last_control_chunk_from = *netp; 3748 } 3749 } 3750#ifdef SCTP_AUDITING_ENABLED 3751 sctp_audit_log(0xB0, ch->chunk_type); 3752#endif 3753 3754 /* check to see if this chunk required auth, but isn't */ 3755 if ((stcb != NULL) && !sctp_auth_disable && 3756 sctp_auth_is_required_chunk(ch->chunk_type, 3757 stcb->asoc.local_auth_chunks) && 3758 !stcb->asoc.authenticated) { 3759 /* "silently" ignore */ 3760 SCTP_STAT_INCR(sctps_recvauthmissing); 3761 goto next_chunk; 3762 } 3763 switch (ch->chunk_type) { 3764 case SCTP_INITIATION: 3765 /* must be first and only chunk */ 3766 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 3767 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3768 /* We are not interested anymore? */ 3769 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3770 /* 3771 * collision case where we are 3772 * sending to them too 3773 */ 3774 ; 3775 } else { 3776 if (locked_tcb) { 3777 SCTP_TCB_UNLOCK(locked_tcb); 3778 } 3779 *offset = length; 3780 return (NULL); 3781 } 3782 } 3783 if ((num_chunks > 1) || 3784 (sctp_strict_init && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 3785 *offset = length; 3786 if (locked_tcb) { 3787 SCTP_TCB_UNLOCK(locked_tcb); 3788 } 3789 return (NULL); 3790 } 3791 if ((stcb != NULL) && 3792 (SCTP_GET_STATE(&stcb->asoc) == 3793 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 3794 sctp_send_shutdown_ack(stcb, 3795 stcb->asoc.primary_destination); 3796 *offset = length; 3797 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3798 if (locked_tcb) { 3799 SCTP_TCB_UNLOCK(locked_tcb); 3800 } 3801 return (NULL); 3802 } 3803 if (netp) { 3804 sctp_handle_init(m, iphlen, *offset, sh, 3805 (struct sctp_init_chunk *)ch, inp, 3806 stcb, *netp, &abort_no_unlock, vrf_id); 3807 } 3808 if (abort_no_unlock) 3809 return (NULL); 3810 3811 *offset = length; 3812 if (locked_tcb) { 3813 SCTP_TCB_UNLOCK(locked_tcb); 3814 } 3815 return (NULL); 3816 break; 3817 case SCTP_PAD_CHUNK: 3818 break; 3819 case SCTP_INITIATION_ACK: 3820 /* must be first and only chunk */ 3821 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 3822 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3823 /* We are not interested anymore */ 3824 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3825 ; 3826 } else { 3827 if (locked_tcb) { 3828 SCTP_TCB_UNLOCK(locked_tcb); 3829 } 3830 *offset = length; 3831 if (stcb) { 3832 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3833 } 3834 return (NULL); 3835 } 3836 } 3837 if ((num_chunks > 1) || 3838 (sctp_strict_init && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 3839 *offset = length; 3840 if (locked_tcb) { 3841 SCTP_TCB_UNLOCK(locked_tcb); 3842 } 3843 return (NULL); 3844 } 3845 if ((netp) && (*netp)) { 3846 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 3847 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 3848 } else { 3849 ret = -1; 3850 } 3851 /* 3852 * Special case, I must call the output routine to 3853 * get the cookie echoed 3854 */ 3855 if (abort_no_unlock) 3856 return (NULL); 3857 3858 if ((stcb) && ret == 0) 3859 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3860 *offset = length; 3861 if (locked_tcb) { 3862 SCTP_TCB_UNLOCK(locked_tcb); 3863 } 3864 return (NULL); 3865 break; 3866 case SCTP_SELECTIVE_ACK: 3867 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 3868 SCTP_STAT_INCR(sctps_recvsacks); 3869 { 3870 struct sctp_sack_chunk *sack; 3871 int abort_now = 0; 3872 uint32_t a_rwnd, cum_ack; 3873 uint16_t num_seg; 3874 int nonce_sum_flag; 3875 3876 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) { 3877 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n"); 3878 *offset = length; 3879 if (locked_tcb) { 3880 SCTP_TCB_UNLOCK(locked_tcb); 3881 } 3882 return (NULL); 3883 } 3884 sack = (struct sctp_sack_chunk *)ch; 3885 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 3886 cum_ack = ntohl(sack->sack.cum_tsn_ack); 3887 num_seg = ntohs(sack->sack.num_gap_ack_blks); 3888 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 3889 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 3890 cum_ack, 3891 num_seg, 3892 a_rwnd 3893 ); 3894 stcb->asoc.seen_a_sack_this_pkt = 1; 3895 if ((stcb->asoc.pr_sctp_cnt == 0) && 3896 (num_seg == 0) && 3897 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 3898 (cum_ack == stcb->asoc.last_acked_seq)) && 3899 (stcb->asoc.saw_sack_with_frags == 0) && 3900 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 3901 ) { 3902 /* 3903 * We have a SIMPLE sack having no 3904 * prior segments and data on sent 3905 * queue to be acked.. Use the 3906 * faster path sack processing. We 3907 * also allow window update sacks 3908 * with no missing segments to go 3909 * this way too. 3910 */ 3911 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 3912 &abort_now); 3913 } else { 3914 if (netp && *netp) 3915 sctp_handle_sack(m, *offset, 3916 sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 3917 } 3918 if (abort_now) { 3919 /* ABORT signal from sack processing */ 3920 *offset = length; 3921 return (NULL); 3922 } 3923 } 3924 break; 3925 case SCTP_HEARTBEAT_REQUEST: 3926 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 3927 if ((stcb) && netp && *netp) { 3928 SCTP_STAT_INCR(sctps_recvheartbeat); 3929 sctp_send_heartbeat_ack(stcb, m, *offset, 3930 chk_length, *netp); 3931 3932 /* He's alive so give him credit */ 3933 stcb->asoc.overall_error_count = 0; 3934 } 3935 break; 3936 case SCTP_HEARTBEAT_ACK: 3937 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 3938 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 3939 /* Its not ours */ 3940 *offset = length; 3941 if (locked_tcb) { 3942 SCTP_TCB_UNLOCK(locked_tcb); 3943 } 3944 return (NULL); 3945 } 3946 /* He's alive so give him credit */ 3947 stcb->asoc.overall_error_count = 0; 3948 SCTP_STAT_INCR(sctps_recvheartbeatack); 3949 if (netp && *netp) 3950 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 3951 stcb, *netp); 3952 break; 3953 case SCTP_ABORT_ASSOCIATION: 3954 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 3955 stcb); 3956 if ((stcb) && netp && *netp) 3957 sctp_handle_abort((struct sctp_abort_chunk *)ch, 3958 stcb, *netp); 3959 *offset = length; 3960 return (NULL); 3961 break; 3962 case SCTP_SHUTDOWN: 3963 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 3964 stcb); 3965 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 3966 *offset = length; 3967 if (locked_tcb) { 3968 SCTP_TCB_UNLOCK(locked_tcb); 3969 } 3970 return (NULL); 3971 3972 } 3973 if (netp && *netp) { 3974 int abort_flag = 0; 3975 3976 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 3977 stcb, *netp, &abort_flag); 3978 if (abort_flag) { 3979 *offset = length; 3980 return (NULL); 3981 } 3982 } 3983 break; 3984 case SCTP_SHUTDOWN_ACK: 3985 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 3986 if ((stcb) && (netp) && (*netp)) 3987 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 3988 *offset = length; 3989 return (NULL); 3990 break; 3991 3992 case SCTP_OPERATION_ERROR: 3993 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 3994 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 3995 3996 *offset = length; 3997 return (NULL); 3998 } 3999 break; 4000 case SCTP_COOKIE_ECHO: 4001 SCTPDBG(SCTP_DEBUG_INPUT3, 4002 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4003 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4004 ; 4005 } else { 4006 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4007 /* We are not interested anymore */ 4008 *offset = length; 4009 return (NULL); 4010 } 4011 } 4012 /* 4013 * First are we accepting? We do this again here 4014 * sincen it is possible that a previous endpoint 4015 * WAS listening responded to a INIT-ACK and then 4016 * closed. We opened and bound.. and are now no 4017 * longer listening. 4018 */ 4019 if (inp->sctp_socket->so_qlimit == 0) { 4020 if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 4021 /* 4022 * special case, is this a retran'd 4023 * COOKIE-ECHO or a restarting assoc 4024 * that is a peeled off or 4025 * one-to-one style socket. 4026 */ 4027 goto process_cookie_anyway; 4028 } 4029 sctp_abort_association(inp, stcb, m, iphlen, 4030 sh, NULL, vrf_id); 4031 *offset = length; 4032 return (NULL); 4033 } else if (inp->sctp_socket->so_qlimit) { 4034 /* we are accepting so check limits like TCP */ 4035 if (inp->sctp_socket->so_qlen > 4036 inp->sctp_socket->so_qlimit) { 4037 /* no space */ 4038 struct mbuf *oper; 4039 struct sctp_paramhdr *phdr; 4040 4041 if (sctp_abort_if_one_2_one_hits_limit) { 4042 oper = NULL; 4043 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4044 0, M_DONTWAIT, 1, MT_DATA); 4045 if (oper) { 4046 SCTP_BUF_LEN(oper) = 4047 sizeof(struct sctp_paramhdr); 4048 phdr = mtod(oper, 4049 struct sctp_paramhdr *); 4050 phdr->param_type = 4051 htons(SCTP_CAUSE_OUT_OF_RESC); 4052 phdr->param_length = 4053 htons(sizeof(struct sctp_paramhdr)); 4054 } 4055 sctp_abort_association(inp, stcb, m, 4056 iphlen, sh, oper, vrf_id); 4057 } 4058 *offset = length; 4059 return (NULL); 4060 } 4061 } 4062 process_cookie_anyway: 4063 { 4064 struct mbuf *ret_buf; 4065 struct sctp_inpcb *linp; 4066 4067 if (stcb) { 4068 linp = NULL; 4069 } else { 4070 linp = inp; 4071 } 4072 4073 if (linp) { 4074 SCTP_ASOC_CREATE_LOCK(linp); 4075 } 4076 if (netp) { 4077 ret_buf = 4078 sctp_handle_cookie_echo(m, iphlen, 4079 *offset, sh, 4080 (struct sctp_cookie_echo_chunk *)ch, 4081 &inp, &stcb, netp, 4082 auth_skipped, 4083 auth_offset, 4084 auth_len, 4085 &locked_tcb, 4086 vrf_id); 4087 } else { 4088 ret_buf = NULL; 4089 } 4090 if (linp) { 4091 SCTP_ASOC_CREATE_UNLOCK(linp); 4092 } 4093 if (ret_buf == NULL) { 4094 if (locked_tcb) { 4095 SCTP_TCB_UNLOCK(locked_tcb); 4096 } 4097 SCTPDBG(SCTP_DEBUG_INPUT3, 4098 "GAK, null buffer\n"); 4099 auth_skipped = 0; 4100 *offset = length; 4101 return (NULL); 4102 } 4103 /* if AUTH skipped, see if it verified... */ 4104 if (auth_skipped) { 4105 got_auth = 1; 4106 auth_skipped = 0; 4107 } 4108 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4109 /* 4110 * Restart the timer if we have 4111 * pending data 4112 */ 4113 struct sctp_tmit_chunk *chk; 4114 4115 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4116 if (chk) { 4117 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4118 stcb->sctp_ep, stcb, 4119 chk->whoTo); 4120 } 4121 } 4122 } 4123 break; 4124 case SCTP_COOKIE_ACK: 4125 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4126 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4127 if (locked_tcb) { 4128 SCTP_TCB_UNLOCK(locked_tcb); 4129 } 4130 return (NULL); 4131 } 4132 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4133 /* We are not interested anymore */ 4134 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4135 ; 4136 } else if (stcb) { 4137 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4138 *offset = length; 4139 return (NULL); 4140 } 4141 } 4142 /* He's alive so give him credit */ 4143 if ((stcb) && netp && *netp) { 4144 stcb->asoc.overall_error_count = 0; 4145 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4146 } 4147 break; 4148 case SCTP_ECN_ECHO: 4149 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4150 /* He's alive so give him credit */ 4151 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4152 /* Its not ours */ 4153 if (locked_tcb) { 4154 SCTP_TCB_UNLOCK(locked_tcb); 4155 } 4156 *offset = length; 4157 return (NULL); 4158 } 4159 if (stcb) { 4160 stcb->asoc.overall_error_count = 0; 4161 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4162 stcb); 4163 } 4164 break; 4165 case SCTP_ECN_CWR: 4166 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 4167 /* He's alive so give him credit */ 4168 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 4169 /* Its not ours */ 4170 if (locked_tcb) { 4171 SCTP_TCB_UNLOCK(locked_tcb); 4172 } 4173 *offset = length; 4174 return (NULL); 4175 } 4176 if (stcb) { 4177 stcb->asoc.overall_error_count = 0; 4178 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4179 } 4180 break; 4181 case SCTP_SHUTDOWN_COMPLETE: 4182 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 4183 /* must be first and only chunk */ 4184 if ((num_chunks > 1) || 4185 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4186 *offset = length; 4187 if (locked_tcb) { 4188 SCTP_TCB_UNLOCK(locked_tcb); 4189 } 4190 return (NULL); 4191 } 4192 if ((stcb) && netp && *netp) { 4193 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4194 stcb, *netp); 4195 } 4196 *offset = length; 4197 return (NULL); 4198 break; 4199 case SCTP_ASCONF: 4200 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 4201 /* He's alive so give him credit */ 4202 if (stcb) { 4203 stcb->asoc.overall_error_count = 0; 4204 sctp_handle_asconf(m, *offset, 4205 (struct sctp_asconf_chunk *)ch, stcb); 4206 } 4207 break; 4208 case SCTP_ASCONF_ACK: 4209 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 4210 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 4211 /* Its not ours */ 4212 if (locked_tcb) { 4213 SCTP_TCB_UNLOCK(locked_tcb); 4214 } 4215 *offset = length; 4216 return (NULL); 4217 } 4218 if ((stcb) && netp && *netp) { 4219 /* He's alive so give him credit */ 4220 stcb->asoc.overall_error_count = 0; 4221 sctp_handle_asconf_ack(m, *offset, 4222 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp); 4223 } 4224 break; 4225 case SCTP_FORWARD_CUM_TSN: 4226 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 4227 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 4228 /* Its not ours */ 4229 if (locked_tcb) { 4230 SCTP_TCB_UNLOCK(locked_tcb); 4231 } 4232 *offset = length; 4233 return (NULL); 4234 } 4235 /* He's alive so give him credit */ 4236 if (stcb) { 4237 int abort_flag = 0; 4238 4239 stcb->asoc.overall_error_count = 0; 4240 *fwd_tsn_seen = 1; 4241 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4242 /* We are not interested anymore */ 4243 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4244 *offset = length; 4245 return (NULL); 4246 } 4247 sctp_handle_forward_tsn(stcb, 4248 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 4249 if (abort_flag) { 4250 *offset = length; 4251 return (NULL); 4252 } else { 4253 stcb->asoc.overall_error_count = 0; 4254 } 4255 4256 } 4257 break; 4258 case SCTP_STREAM_RESET: 4259 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 4260 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 4261 /* Its not ours */ 4262 if (locked_tcb) { 4263 SCTP_TCB_UNLOCK(locked_tcb); 4264 } 4265 *offset = length; 4266 return (NULL); 4267 } 4268 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4269 /* We are not interested anymore */ 4270 sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4271 *offset = length; 4272 return (NULL); 4273 } 4274 if (stcb->asoc.peer_supports_strreset == 0) { 4275 /* 4276 * hmm, peer should have announced this, but 4277 * we will turn it on since he is sending us 4278 * a stream reset. 4279 */ 4280 stcb->asoc.peer_supports_strreset = 1; 4281 } 4282 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 4283 /* stop processing */ 4284 *offset = length; 4285 return (NULL); 4286 } 4287 break; 4288 case SCTP_PACKET_DROPPED: 4289 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 4290 /* re-get it all please */ 4291 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 4292 /* Its not ours */ 4293 if (locked_tcb) { 4294 SCTP_TCB_UNLOCK(locked_tcb); 4295 } 4296 *offset = length; 4297 return (NULL); 4298 } 4299 if (ch && (stcb) && netp && (*netp)) { 4300 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 4301 stcb, *netp, 4302 min(chk_length, (sizeof(chunk_buf) - 4))); 4303 4304 } 4305 break; 4306 4307 case SCTP_AUTHENTICATION: 4308 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 4309 if (sctp_auth_disable) 4310 goto unknown_chunk; 4311 4312 if (stcb == NULL) { 4313 /* save the first AUTH for later processing */ 4314 if (auth_skipped == 0) { 4315 auth_offset = *offset; 4316 auth_len = chk_length; 4317 auth_skipped = 1; 4318 } 4319 /* skip this chunk (temporarily) */ 4320 goto next_chunk; 4321 } 4322 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 4323 (chk_length > (sizeof(struct sctp_auth_chunk) + 4324 SCTP_AUTH_DIGEST_LEN_MAX))) { 4325 /* Its not ours */ 4326 if (locked_tcb) { 4327 SCTP_TCB_UNLOCK(locked_tcb); 4328 } 4329 *offset = length; 4330 return (NULL); 4331 } 4332 if (got_auth == 1) { 4333 /* skip this chunk... it's already auth'd */ 4334 goto next_chunk; 4335 } 4336 got_auth = 1; 4337 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 4338 m, *offset)) { 4339 /* auth HMAC failed so dump the packet */ 4340 *offset = length; 4341 return (stcb); 4342 } else { 4343 /* remaining chunks are HMAC checked */ 4344 stcb->asoc.authenticated = 1; 4345 } 4346 break; 4347 4348 default: 4349 unknown_chunk: 4350 /* it's an unknown chunk! */ 4351 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 4352 struct mbuf *mm; 4353 struct sctp_paramhdr *phd; 4354 4355 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4356 0, M_DONTWAIT, 1, MT_DATA); 4357 if (mm) { 4358 phd = mtod(mm, struct sctp_paramhdr *); 4359 /* 4360 * We cheat and use param type since 4361 * we did not bother to define a 4362 * error cause struct. They are the 4363 * same basic format with different 4364 * names. 4365 */ 4366 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 4367 phd->param_length = htons(chk_length + sizeof(*phd)); 4368 SCTP_BUF_LEN(mm) = sizeof(*phd); 4369 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 4370 M_DONTWAIT); 4371 if (SCTP_BUF_NEXT(mm)) { 4372 sctp_queue_op_err(stcb, mm); 4373 } else { 4374 sctp_m_freem(mm); 4375 } 4376 } 4377 } 4378 if ((ch->chunk_type & 0x80) == 0) { 4379 /* discard this packet */ 4380 *offset = length; 4381 return (stcb); 4382 } /* else skip this bad chunk and continue... */ 4383 break; 4384 } /* switch (ch->chunk_type) */ 4385 4386 4387next_chunk: 4388 /* get the next chunk */ 4389 *offset += SCTP_SIZE32(chk_length); 4390 if (*offset >= length) { 4391 /* no more data left in the mbuf chain */ 4392 break; 4393 } 4394 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4395 sizeof(struct sctp_chunkhdr), chunk_buf); 4396 if (ch == NULL) { 4397 if (locked_tcb) { 4398 SCTP_TCB_UNLOCK(locked_tcb); 4399 } 4400 *offset = length; 4401 return (NULL); 4402 } 4403 } /* while */ 4404 return (stcb); 4405} 4406 4407 4408/* 4409 * Process the ECN bits we have something set so we must look to see if it is 4410 * ECN(0) or ECN(1) or CE 4411 */ 4412static void 4413sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 4414 uint8_t ecn_bits) 4415{ 4416 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4417 ; 4418 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 4419 /* 4420 * we only add to the nonce sum for ECT1, ECT0 does not 4421 * change the NS bit (that we have yet to find a way to send 4422 * it yet). 4423 */ 4424 4425 /* ECN Nonce stuff */ 4426 stcb->asoc.receiver_nonce_sum++; 4427 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 4428 4429 /* 4430 * Drag up the last_echo point if cumack is larger since we 4431 * don't want the point falling way behind by more than 4432 * 2^^31 and then having it be incorrect. 4433 */ 4434 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4435 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4436 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4437 } 4438 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 4439 /* 4440 * Drag up the last_echo point if cumack is larger since we 4441 * don't want the point falling way behind by more than 4442 * 2^^31 and then having it be incorrect. 4443 */ 4444 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4445 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4446 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4447 } 4448 } 4449} 4450 4451static void 4452sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 4453 uint32_t high_tsn, uint8_t ecn_bits) 4454{ 4455 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4456 /* 4457 * we possibly must notify the sender that a congestion 4458 * window reduction is in order. We do this by adding a ECNE 4459 * chunk to the output chunk queue. The incoming CWR will 4460 * remove this chunk. 4461 */ 4462 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 4463 MAX_TSN)) { 4464 /* Yep, we need to add a ECNE */ 4465 sctp_send_ecn_echo(stcb, net, high_tsn); 4466 stcb->asoc.last_echo_tsn = high_tsn; 4467 } 4468 } 4469} 4470 4471#ifdef INVARIANTS 4472static void 4473sctp_validate_no_locks(struct sctp_inpcb *inp) 4474{ 4475 struct sctp_tcb *stcb; 4476 4477 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 4478 if (mtx_owned(&stcb->tcb_mtx)) { 4479 panic("Own lock on stcb at return from input"); 4480 } 4481 } 4482} 4483 4484#endif 4485 4486/* 4487 * common input chunk processing (v4 and v6) 4488 */ 4489void 4490sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 4491 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 4492 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 4493 uint8_t ecn_bits, uint32_t vrf_id) 4494{ 4495 /* 4496 * Control chunk processing 4497 */ 4498 uint32_t high_tsn; 4499 int fwd_tsn_seen = 0, data_processed = 0; 4500 struct mbuf *m = *mm; 4501 int abort_flag = 0; 4502 int un_sent; 4503 4504 SCTP_STAT_INCR(sctps_recvdatagrams); 4505#ifdef SCTP_AUDITING_ENABLED 4506 sctp_audit_log(0xE0, 1); 4507 sctp_auditing(0, inp, stcb, net); 4508#endif 4509 4510 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d\n", 4511 m, iphlen, offset); 4512 4513 if (stcb) { 4514 /* always clear this before beginning a packet */ 4515 stcb->asoc.authenticated = 0; 4516 stcb->asoc.seen_a_sack_this_pkt = 0; 4517 if (stcb->asoc.state & SCTP_STATE_WAS_ABORTED) { 4518 /*- 4519 * If we hit here, we had a ref count 4520 * up when the assoc was aborted and the 4521 * timer is clearing out the assoc, we should 4522 * NOT respond to any packet.. its OOTB. 4523 */ 4524 SCTP_TCB_UNLOCK(stcb); 4525 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4526 vrf_id); 4527 goto out_now; 4528 } 4529 } 4530 if (IS_SCTP_CONTROL(ch)) { 4531 /* process the control portion of the SCTP packet */ 4532 /* sa_ignore NO_NULL_CHK */ 4533 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 4534 inp, stcb, &net, &fwd_tsn_seen, vrf_id); 4535 if (stcb) { 4536 /* 4537 * This covers us if the cookie-echo was there and 4538 * it changes our INP. 4539 */ 4540 inp = stcb->sctp_ep; 4541 } 4542 } else { 4543 /* 4544 * no control chunks, so pre-process DATA chunks (these 4545 * checks are taken care of by control processing) 4546 */ 4547 4548 /* 4549 * if DATA only packet, and auth is required, then punt... 4550 * can't have authenticated without any AUTH (control) 4551 * chunks 4552 */ 4553 if ((stcb != NULL) && !sctp_auth_disable && 4554 sctp_auth_is_required_chunk(SCTP_DATA, 4555 stcb->asoc.local_auth_chunks)) { 4556 /* "silently" ignore */ 4557 SCTP_STAT_INCR(sctps_recvauthmissing); 4558 SCTP_TCB_UNLOCK(stcb); 4559 goto out_now; 4560 } 4561 if (stcb == NULL) { 4562 /* out of the blue DATA chunk */ 4563 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4564 vrf_id); 4565 goto out_now; 4566 } 4567 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 4568 /* v_tag mismatch! */ 4569 SCTP_STAT_INCR(sctps_badvtag); 4570 SCTP_TCB_UNLOCK(stcb); 4571 goto out_now; 4572 } 4573 } 4574 4575 if (stcb == NULL) { 4576 /* 4577 * no valid TCB for this packet, or we found it's a bad 4578 * packet while processing control, or we're done with this 4579 * packet (done or skip rest of data), so we drop it... 4580 */ 4581 goto out_now; 4582 } 4583 /* 4584 * DATA chunk processing 4585 */ 4586 /* plow through the data chunks while length > offset */ 4587 4588 /* 4589 * Rest should be DATA only. Check authentication state if AUTH for 4590 * DATA is required. 4591 */ 4592 if ((length > offset) && (stcb != NULL) && !sctp_auth_disable && 4593 sctp_auth_is_required_chunk(SCTP_DATA, 4594 stcb->asoc.local_auth_chunks) && 4595 !stcb->asoc.authenticated) { 4596 /* "silently" ignore */ 4597 SCTP_STAT_INCR(sctps_recvauthmissing); 4598 SCTPDBG(SCTP_DEBUG_AUTH1, 4599 "Data chunk requires AUTH, skipped\n"); 4600 goto trigger_send; 4601 } 4602 if (length > offset) { 4603 int retval; 4604 4605 /* 4606 * First check to make sure our state is correct. We would 4607 * not get here unless we really did have a tag, so we don't 4608 * abort if this happens, just dump the chunk silently. 4609 */ 4610 switch (SCTP_GET_STATE(&stcb->asoc)) { 4611 case SCTP_STATE_COOKIE_ECHOED: 4612 /* 4613 * we consider data with valid tags in this state 4614 * shows us the cookie-ack was lost. Imply it was 4615 * there. 4616 */ 4617 stcb->asoc.overall_error_count = 0; 4618 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 4619 break; 4620 case SCTP_STATE_COOKIE_WAIT: 4621 /* 4622 * We consider OOTB any data sent during asoc setup. 4623 */ 4624 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4625 vrf_id); 4626 SCTP_TCB_UNLOCK(stcb); 4627 goto out_now; 4628 /* sa_ignore NOTREACHED */ 4629 break; 4630 case SCTP_STATE_EMPTY: /* should not happen */ 4631 case SCTP_STATE_INUSE: /* should not happen */ 4632 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 4633 case SCTP_STATE_SHUTDOWN_ACK_SENT: 4634 default: 4635 SCTP_TCB_UNLOCK(stcb); 4636 goto out_now; 4637 /* sa_ignore NOTREACHED */ 4638 break; 4639 case SCTP_STATE_OPEN: 4640 case SCTP_STATE_SHUTDOWN_SENT: 4641 break; 4642 } 4643 /* take care of ECN, part 1. */ 4644 if (stcb->asoc.ecn_allowed && 4645 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4646 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 4647 } 4648 /* plow through the data chunks while length > offset */ 4649 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 4650 inp, stcb, net, &high_tsn); 4651 if (retval == 2) { 4652 /* 4653 * The association aborted, NO UNLOCK needed since 4654 * the association is destroyed. 4655 */ 4656 goto out_now; 4657 } 4658 data_processed = 1; 4659 if (retval == 0) { 4660 /* take care of ecn part 2. */ 4661 if (stcb->asoc.ecn_allowed && 4662 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4663 sctp_process_ecn_marked_b(stcb, net, high_tsn, 4664 ecn_bits); 4665 } 4666 } 4667 /* 4668 * Anything important needs to have been m_copy'ed in 4669 * process_data 4670 */ 4671 } 4672 if ((data_processed == 0) && (fwd_tsn_seen)) { 4673 int was_a_gap = 0; 4674 4675 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 4676 stcb->asoc.cumulative_tsn, MAX_TSN)) { 4677 /* there was a gap before this data was processed */ 4678 was_a_gap = 1; 4679 } 4680 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 4681 if (abort_flag) { 4682 /* Again, we aborted so NO UNLOCK needed */ 4683 goto out_now; 4684 } 4685 } 4686 /* trigger send of any chunks in queue... */ 4687trigger_send: 4688#ifdef SCTP_AUDITING_ENABLED 4689 sctp_audit_log(0xE0, 2); 4690 sctp_auditing(1, inp, stcb, net); 4691#endif 4692 SCTPDBG(SCTP_DEBUG_INPUT1, 4693 "Check for chunk output prw:%d tqe:%d tf=%d\n", 4694 stcb->asoc.peers_rwnd, 4695 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 4696 stcb->asoc.total_flight); 4697 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 4698 4699 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 4700 ((un_sent) && 4701 (stcb->asoc.peers_rwnd > 0 || 4702 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 4703 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 4704 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 4705 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 4706 } 4707#ifdef SCTP_AUDITING_ENABLED 4708 sctp_audit_log(0xE0, 3); 4709 sctp_auditing(2, inp, stcb, net); 4710#endif 4711 SCTP_TCB_UNLOCK(stcb); 4712out_now: 4713#ifdef INVARIANTS 4714 sctp_validate_no_locks(inp); 4715#endif 4716 return; 4717} 4718 4719 4720 4721void 4722sctp_input(i_pak, off) 4723 struct mbuf *i_pak; 4724 int off; 4725 4726{ 4727#ifdef SCTP_MBUF_LOGGING 4728 struct mbuf *mat; 4729 4730#endif 4731 struct mbuf *m; 4732 int iphlen; 4733 uint32_t vrf_id = 0; 4734 uint8_t ecn_bits; 4735 struct ip *ip; 4736 struct sctphdr *sh; 4737 struct sctp_inpcb *inp = NULL; 4738 4739 uint32_t check, calc_check; 4740 struct sctp_nets *net; 4741 struct sctp_tcb *stcb = NULL; 4742 struct sctp_chunkhdr *ch; 4743 int refcount_up = 0; 4744 int length, mlen, offset; 4745 4746 4747 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 4748 SCTP_RELEASE_PKT(i_pak); 4749 return; 4750 } 4751 mlen = SCTP_HEADER_LEN(i_pak); 4752 iphlen = off; 4753 m = SCTP_HEADER_TO_CHAIN(i_pak); 4754 4755 net = NULL; 4756 SCTP_STAT_INCR(sctps_recvpackets); 4757 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 4758 4759 4760#ifdef SCTP_MBUF_LOGGING 4761 /* Log in any input mbufs */ 4762 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) { 4763 mat = m; 4764 while (mat) { 4765 if (SCTP_BUF_IS_EXTENDED(mat)) { 4766 sctp_log_mb(mat, SCTP_MBUF_INPUT); 4767 } 4768 mat = SCTP_BUF_NEXT(mat); 4769 } 4770 } 4771#endif 4772#ifdef SCTP_PACKET_LOGGING 4773 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING) 4774 sctp_packet_log(m, mlen); 4775#endif 4776 /* 4777 * Must take out the iphlen, since mlen expects this (only effect lb 4778 * case) 4779 */ 4780 mlen -= iphlen; 4781 4782 /* 4783 * Get IP, SCTP, and first chunk header together in first mbuf. 4784 */ 4785 ip = mtod(m, struct ip *); 4786 offset = iphlen + sizeof(*sh) + sizeof(*ch); 4787 if (SCTP_BUF_LEN(m) < offset) { 4788 if ((m = m_pullup(m, offset)) == 0) { 4789 SCTP_STAT_INCR(sctps_hdrops); 4790 return; 4791 } 4792 ip = mtod(m, struct ip *); 4793 } 4794 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 4795 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 4796 SCTPDBG(SCTP_DEBUG_INPUT1, 4797 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 4798 4799 /* SCTP does not allow broadcasts or multicasts */ 4800 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 4801 goto bad; 4802 } 4803 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 4804 /* 4805 * We only look at broadcast if its a front state, All 4806 * others we will not have a tcb for anyway. 4807 */ 4808 goto bad; 4809 } 4810 /* validate SCTP checksum */ 4811 if ((sctp_no_csum_on_loopback == 0) || !SCTP_IS_IT_LOOPBACK(m)) { 4812 /* 4813 * we do NOT validate things from the loopback if the sysctl 4814 * is set to 1. 4815 */ 4816 check = sh->checksum; /* save incoming checksum */ 4817 if ((check == 0) && (sctp_no_csum_on_loopback)) { 4818 /* 4819 * special hook for where we got a local address 4820 * somehow routed across a non IFT_LOOP type 4821 * interface 4822 */ 4823 if (ip->ip_src.s_addr == ip->ip_dst.s_addr) 4824 goto sctp_skip_csum_4; 4825 } 4826 sh->checksum = 0; /* prepare for calc */ 4827 calc_check = sctp_calculate_sum(m, &mlen, iphlen); 4828 if (calc_check != check) { 4829 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 4830 calc_check, check, m, mlen, iphlen); 4831 4832 stcb = sctp_findassociation_addr(m, iphlen, 4833 offset - sizeof(*ch), 4834 sh, ch, &inp, &net, 4835 vrf_id); 4836 if ((inp) && (stcb)) { 4837 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 4838 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR); 4839 } else if ((inp != NULL) && (stcb == NULL)) { 4840 refcount_up = 1; 4841 } 4842 SCTP_STAT_INCR(sctps_badsum); 4843 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 4844 goto bad; 4845 } 4846 sh->checksum = calc_check; 4847 } 4848sctp_skip_csum_4: 4849 /* destination port of 0 is illegal, based on RFC2960. */ 4850 if (sh->dest_port == 0) { 4851 SCTP_STAT_INCR(sctps_hdrops); 4852 goto bad; 4853 } 4854 /* validate mbuf chain length with IP payload length */ 4855 if (mlen < (ip->ip_len - iphlen)) { 4856 SCTP_STAT_INCR(sctps_hdrops); 4857 goto bad; 4858 } 4859 /* 4860 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 4861 * IP/SCTP/first chunk header... 4862 */ 4863 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 4864 sh, ch, &inp, &net, vrf_id); 4865 /* inp's ref-count increased && stcb locked */ 4866 if (inp == NULL) { 4867 struct sctp_init_chunk *init_chk, chunk_buf; 4868 4869 SCTP_STAT_INCR(sctps_noport); 4870#ifdef ICMP_BANDLIM 4871 /* 4872 * we use the bandwidth limiting to protect against sending 4873 * too many ABORTS all at once. In this case these count the 4874 * same as an ICMP message. 4875 */ 4876 if (badport_bandlim(0) < 0) 4877 goto bad; 4878#endif /* ICMP_BANDLIM */ 4879 SCTPDBG(SCTP_DEBUG_INPUT1, 4880 "Sending a ABORT from packet entry!\n"); 4881 if (ch->chunk_type == SCTP_INITIATION) { 4882 /* 4883 * we do a trick here to get the INIT tag, dig in 4884 * and get the tag from the INIT and put it in the 4885 * common header. 4886 */ 4887 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 4888 iphlen + sizeof(*sh), sizeof(*init_chk), 4889 (uint8_t *) & chunk_buf); 4890 if (init_chk != NULL) 4891 sh->v_tag = init_chk->init.initiate_tag; 4892 } 4893 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4894 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id); 4895 goto bad; 4896 } 4897 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 4898 goto bad; 4899 } 4900 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 4901 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id); 4902 goto bad; 4903 } else if (stcb == NULL) { 4904 refcount_up = 1; 4905 } 4906#ifdef IPSEC 4907 /* 4908 * I very much doubt any of the IPSEC stuff will work but I have no 4909 * idea, so I will leave it in place. 4910 */ 4911 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 4912 ipsec4stat.in_polvio++; 4913 SCTP_STAT_INCR(sctps_hdrops); 4914 goto bad; 4915 } 4916#endif /* IPSEC */ 4917 4918 /* 4919 * common chunk processing 4920 */ 4921 length = ip->ip_len + iphlen; 4922 offset -= sizeof(struct sctp_chunkhdr); 4923 4924 ecn_bits = ip->ip_tos; 4925 4926 /* sa_ignore NO_NULL_CHK */ 4927 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 4928 inp, stcb, net, ecn_bits, vrf_id); 4929 /* inp's ref-count reduced && stcb unlocked */ 4930 if (m) { 4931 sctp_m_freem(m); 4932 } 4933 if ((inp) && (refcount_up)) { 4934 /* reduce ref-count */ 4935 SCTP_INP_WLOCK(inp); 4936 SCTP_INP_DECR_REF(inp); 4937 SCTP_INP_WUNLOCK(inp); 4938 } 4939 return; 4940bad: 4941 if (stcb) { 4942 SCTP_TCB_UNLOCK(stcb); 4943 } 4944 if ((inp) && (refcount_up)) { 4945 /* reduce ref-count */ 4946 SCTP_INP_WLOCK(inp); 4947 SCTP_INP_DECR_REF(inp); 4948 SCTP_INP_WUNLOCK(inp); 4949 } 4950 if (m) { 4951 sctp_m_freem(m); 4952 } 4953 return; 4954} 4955