sctp_input.c revision 171943
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 171943 2007-08-24 00:53:53Z 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 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 429 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 430 stcb->asoc.overall_error_count, 431 0, 432 SCTP_FROM_SCTP_INPUT, 433 __LINE__); 434 } 435 stcb->asoc.overall_error_count = 0; 436 net->error_count = 0; 437 438 /* 439 * Cancel the INIT timer, We do this first before queueing the 440 * cookie. We always cancel at the primary to assue that we are 441 * canceling the timer started by the INIT which always goes to the 442 * primary. 443 */ 444 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 445 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 446 447 /* calculate the RTO */ 448 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy); 449 450 retval = sctp_send_cookie_echo(m, offset, stcb, net); 451 if (retval < 0) { 452 /* 453 * No cookie, we probably should send a op error. But in any 454 * case if there is no cookie in the INIT-ACK, we can 455 * abandon the peer, its broke. 456 */ 457 if (retval == -3) { 458 /* We abort with an error of missing mandatory param */ 459 op_err = 460 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 461 if (op_err) { 462 /* 463 * Expand beyond to include the mandatory 464 * param cookie 465 */ 466 struct sctp_inv_mandatory_param *mp; 467 468 SCTP_BUF_LEN(op_err) = 469 sizeof(struct sctp_inv_mandatory_param); 470 mp = mtod(op_err, 471 struct sctp_inv_mandatory_param *); 472 /* Subtract the reserved param */ 473 mp->length = 474 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 475 mp->num_param = htonl(1); 476 mp->param = htons(SCTP_STATE_COOKIE); 477 mp->resv = 0; 478 } 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 sh, op_err, 0); 481 *abort_no_unlock = 1; 482 } 483 return (retval); 484 } 485 return (0); 486} 487 488static void 489sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 490 struct sctp_tcb *stcb, struct sctp_nets *net) 491{ 492 struct sockaddr_storage store; 493 struct sockaddr_in *sin; 494 struct sockaddr_in6 *sin6; 495 struct sctp_nets *r_net; 496 struct timeval tv; 497 498 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 499 /* Invalid length */ 500 return; 501 } 502 sin = (struct sockaddr_in *)&store; 503 sin6 = (struct sockaddr_in6 *)&store; 504 505 memset(&store, 0, sizeof(store)); 506 if (cp->heartbeat.hb_info.addr_family == AF_INET && 507 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 508 sin->sin_family = cp->heartbeat.hb_info.addr_family; 509 sin->sin_len = cp->heartbeat.hb_info.addr_len; 510 sin->sin_port = stcb->rport; 511 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 512 sizeof(sin->sin_addr)); 513 } else if (cp->heartbeat.hb_info.addr_family == AF_INET6 && 514 cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 515 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 516 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 517 sin6->sin6_port = stcb->rport; 518 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 519 sizeof(sin6->sin6_addr)); 520 } else { 521 return; 522 } 523 r_net = sctp_findnet(stcb, (struct sockaddr *)sin); 524 if (r_net == NULL) { 525 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 526 return; 527 } 528 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 529 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 530 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 531 /* 532 * If the its a HB and it's random value is correct when can 533 * confirm the destination. 534 */ 535 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 536 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 537 stcb->asoc.primary_destination = r_net; 538 r_net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY; 539 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 540 r_net = TAILQ_FIRST(&stcb->asoc.nets); 541 if (r_net != stcb->asoc.primary_destination) { 542 /* 543 * first one on the list is NOT the primary 544 * sctp_cmpaddr() is much more efficent if 545 * the primary is the first on the list, 546 * make it so. 547 */ 548 TAILQ_REMOVE(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 549 TAILQ_INSERT_HEAD(&stcb->asoc.nets, stcb->asoc.primary_destination, sctp_next); 550 } 551 } 552 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 553 stcb, 0, (void *)r_net); 554 } 555 r_net->error_count = 0; 556 r_net->hb_responded = 1; 557 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 558 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 559 if (r_net->dest_state & SCTP_ADDR_NOT_REACHABLE) { 560 r_net->dest_state &= ~SCTP_ADDR_NOT_REACHABLE; 561 r_net->dest_state |= SCTP_ADDR_REACHABLE; 562 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 563 SCTP_HEARTBEAT_SUCCESS, (void *)r_net); 564 /* now was it the primary? if so restore */ 565 if (r_net->dest_state & SCTP_ADDR_WAS_PRIMARY) { 566 (void)sctp_set_primary_addr(stcb, (struct sockaddr *)NULL, r_net); 567 } 568 } 569 /* 570 * JRS 5/14/07 - If CMT PF is on and the destination is in PF state, 571 * set the destination to active state and set the cwnd to one or 572 * two MTU's based on whether PF1 or PF2 is being used. If a T3 573 * timer is running, for the destination, stop the timer because a 574 * PF-heartbeat was received. 575 */ 576 if (sctp_cmt_on_off && sctp_cmt_pf && (net->dest_state & SCTP_ADDR_PF) == 577 SCTP_ADDR_PF) { 578 if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { 579 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 580 stcb, net, 581 SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 582 } 583 net->dest_state &= ~SCTP_ADDR_PF; 584 net->cwnd = net->mtu * sctp_cmt_pf; 585 SCTPDBG(SCTP_DEBUG_INPUT1, "Destination %p moved from PF to reachable with cwnd %d.\n", 586 net, net->cwnd); 587 } 588 /* Now lets do a RTO with this */ 589 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy); 590} 591 592static void 593sctp_handle_abort(struct sctp_abort_chunk *cp, 594 struct sctp_tcb *stcb, struct sctp_nets *net) 595{ 596 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 597 if (stcb == NULL) 598 return; 599 600 /* stop any receive timers */ 601 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 602 /* notify user of the abort and clean up... */ 603 sctp_abort_notification(stcb, 0); 604 /* free the tcb */ 605 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 606 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 607 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 608 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 609 } 610#ifdef SCTP_ASOCLOG_OF_TSNS 611 sctp_print_out_track_log(stcb); 612#endif 613 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 614 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 615 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 616} 617 618static void 619sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 620 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 621{ 622 struct sctp_association *asoc; 623 int some_on_streamwheel; 624 625 SCTPDBG(SCTP_DEBUG_INPUT2, 626 "sctp_handle_shutdown: handling SHUTDOWN\n"); 627 if (stcb == NULL) 628 return; 629 asoc = &stcb->asoc; 630 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 631 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 632 return; 633 } 634 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 635 /* Shutdown NOT the expected size */ 636 return; 637 } else { 638 sctp_update_acked(stcb, cp, net, abort_flag); 639 } 640 if (asoc->control_pdapi) { 641 /* 642 * With a normal shutdown we assume the end of last record. 643 */ 644 SCTP_INP_READ_LOCK(stcb->sctp_ep); 645 asoc->control_pdapi->end_added = 1; 646 asoc->control_pdapi->pdapi_aborted = 1; 647 asoc->control_pdapi = NULL; 648 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 649 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 650 } 651 /* goto SHUTDOWN_RECEIVED state to block new requests */ 652 if (stcb->sctp_socket) { 653 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 654 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 655 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 656 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 657 /* 658 * notify upper layer that peer has initiated a 659 * shutdown 660 */ 661 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL); 662 663 /* reset time */ 664 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 665 } 666 } 667 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 668 /* 669 * stop the shutdown timer, since we WILL move to 670 * SHUTDOWN-ACK-SENT. 671 */ 672 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 673 } 674 /* Now is there unsent data on a stream somewhere? */ 675 some_on_streamwheel = sctp_is_there_unsent_data(stcb); 676 677 if (!TAILQ_EMPTY(&asoc->send_queue) || 678 !TAILQ_EMPTY(&asoc->sent_queue) || 679 some_on_streamwheel) { 680 /* By returning we will push more data out */ 681 return; 682 } else { 683 /* no outstanding data to send, so move on... */ 684 /* send SHUTDOWN-ACK */ 685 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 686 /* move to SHUTDOWN-ACK-SENT state */ 687 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 688 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 689 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 690 } 691 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 692 693 /* start SHUTDOWN timer */ 694 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 695 stcb, net); 696 } 697} 698 699static void 700sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp, 701 struct sctp_tcb *stcb, struct sctp_nets *net) 702{ 703 struct sctp_association *asoc; 704 705 SCTPDBG(SCTP_DEBUG_INPUT2, 706 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 707 if (stcb == NULL) 708 return; 709 710 asoc = &stcb->asoc; 711 /* process according to association state */ 712 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 713 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 714 /* unexpected SHUTDOWN-ACK... so ignore... */ 715 SCTP_TCB_UNLOCK(stcb); 716 return; 717 } 718 if (asoc->control_pdapi) { 719 /* 720 * With a normal shutdown we assume the end of last record. 721 */ 722 SCTP_INP_READ_LOCK(stcb->sctp_ep); 723 asoc->control_pdapi->end_added = 1; 724 asoc->control_pdapi->pdapi_aborted = 1; 725 asoc->control_pdapi = NULL; 726 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 727 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 728 } 729 /* are the queues empty? */ 730 if (!TAILQ_EMPTY(&asoc->send_queue) || 731 !TAILQ_EMPTY(&asoc->sent_queue) || 732 !TAILQ_EMPTY(&asoc->out_wheel)) { 733 sctp_report_all_outbound(stcb, 0); 734 } 735 /* stop the timer */ 736 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 737 /* send SHUTDOWN-COMPLETE */ 738 sctp_send_shutdown_complete(stcb, net); 739 /* notify upper layer protocol */ 740 if (stcb->sctp_socket) { 741 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 742 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 743 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 744 /* Set the connected flag to disconnected */ 745 stcb->sctp_ep->sctp_socket->so_snd.sb_cc = 0; 746 } 747 } 748 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 749 /* free the TCB but first save off the ep */ 750 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 751 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 752} 753 754/* 755 * Skip past the param header and then we will find the chunk that caused the 756 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 757 * our peer must be broken. 758 */ 759static void 760sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 761 struct sctp_nets *net) 762{ 763 struct sctp_chunkhdr *chk; 764 765 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 766 switch (chk->chunk_type) { 767 case SCTP_ASCONF_ACK: 768 case SCTP_ASCONF: 769 sctp_asconf_cleanup(stcb, net); 770 break; 771 case SCTP_FORWARD_CUM_TSN: 772 stcb->asoc.peer_supports_prsctp = 0; 773 break; 774 default: 775 SCTPDBG(SCTP_DEBUG_INPUT2, 776 "Peer does not support chunk type %d(%x)??\n", 777 chk->chunk_type, (uint32_t) chk->chunk_type); 778 break; 779 } 780} 781 782/* 783 * Skip past the param header and then we will find the param that caused the 784 * problem. There are a number of param's in a ASCONF OR the prsctp param 785 * these will turn of specific features. 786 */ 787static void 788sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 789{ 790 struct sctp_paramhdr *pbad; 791 792 pbad = phdr + 1; 793 switch (ntohs(pbad->param_type)) { 794 /* pr-sctp draft */ 795 case SCTP_PRSCTP_SUPPORTED: 796 stcb->asoc.peer_supports_prsctp = 0; 797 break; 798 case SCTP_SUPPORTED_CHUNK_EXT: 799 break; 800 /* draft-ietf-tsvwg-addip-sctp */ 801 case SCTP_ECN_NONCE_SUPPORTED: 802 stcb->asoc.peer_supports_ecn_nonce = 0; 803 stcb->asoc.ecn_nonce_allowed = 0; 804 stcb->asoc.ecn_allowed = 0; 805 break; 806 case SCTP_ADD_IP_ADDRESS: 807 case SCTP_DEL_IP_ADDRESS: 808 case SCTP_SET_PRIM_ADDR: 809 stcb->asoc.peer_supports_asconf = 0; 810 break; 811 case SCTP_SUCCESS_REPORT: 812 case SCTP_ERROR_CAUSE_IND: 813 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 814 SCTPDBG(SCTP_DEBUG_INPUT2, 815 "Turning off ASCONF to this strange peer\n"); 816 stcb->asoc.peer_supports_asconf = 0; 817 break; 818 default: 819 SCTPDBG(SCTP_DEBUG_INPUT2, 820 "Peer does not support param type %d(%x)??\n", 821 pbad->param_type, (uint32_t) pbad->param_type); 822 break; 823 } 824} 825 826static int 827sctp_handle_error(struct sctp_chunkhdr *ch, 828 struct sctp_tcb *stcb, struct sctp_nets *net) 829{ 830 int chklen; 831 struct sctp_paramhdr *phdr; 832 uint16_t error_type; 833 uint16_t error_len; 834 struct sctp_association *asoc; 835 836 int adjust; 837 838 /* parse through all of the errors and process */ 839 asoc = &stcb->asoc; 840 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 841 sizeof(struct sctp_chunkhdr)); 842 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 843 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 844 /* Process an Error Cause */ 845 error_type = ntohs(phdr->param_type); 846 error_len = ntohs(phdr->param_length); 847 if ((error_len > chklen) || (error_len == 0)) { 848 /* invalid param length for this param */ 849 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 850 chklen, error_len); 851 return (0); 852 } 853 switch (error_type) { 854 case SCTP_CAUSE_INVALID_STREAM: 855 case SCTP_CAUSE_MISSING_PARAM: 856 case SCTP_CAUSE_INVALID_PARAM: 857 case SCTP_CAUSE_NO_USER_DATA: 858 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 859 error_type); 860 break; 861 case SCTP_CAUSE_STALE_COOKIE: 862 /* 863 * We only act if we have echoed a cookie and are 864 * waiting. 865 */ 866 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 867 int *p; 868 869 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 870 /* Save the time doubled */ 871 asoc->cookie_preserve_req = ntohl(*p) << 1; 872 asoc->stale_cookie_count++; 873 if (asoc->stale_cookie_count > 874 asoc->max_init_times) { 875 sctp_abort_notification(stcb, 0); 876 /* now free the asoc */ 877 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 878 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 879 return (-1); 880 } 881 /* blast back to INIT state */ 882 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 883 asoc->state |= SCTP_STATE_COOKIE_WAIT; 884 885 sctp_stop_all_cookie_timers(stcb); 886 sctp_send_initiate(stcb->sctp_ep, stcb); 887 } 888 break; 889 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 890 /* 891 * Nothing we can do here, we don't do hostname 892 * addresses so if the peer does not like my IPv6 893 * (or IPv4 for that matter) it does not matter. If 894 * they don't support that type of address, they can 895 * NOT possibly get that packet type... i.e. with no 896 * IPv6 you can't recieve a IPv6 packet. so we can 897 * safely ignore this one. If we ever added support 898 * for HOSTNAME Addresses, then we would need to do 899 * something here. 900 */ 901 break; 902 case SCTP_CAUSE_UNRECOG_CHUNK: 903 sctp_process_unrecog_chunk(stcb, phdr, net); 904 break; 905 case SCTP_CAUSE_UNRECOG_PARAM: 906 sctp_process_unrecog_param(stcb, phdr); 907 break; 908 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 909 /* 910 * We ignore this since the timer will drive out a 911 * new cookie anyway and there timer will drive us 912 * to send a SHUTDOWN_COMPLETE. We can't send one 913 * here since we don't have their tag. 914 */ 915 break; 916 case SCTP_CAUSE_DELETING_LAST_ADDR: 917 case SCTP_CAUSE_RESOURCE_SHORTAGE: 918 case SCTP_CAUSE_DELETING_SRC_ADDR: 919 /* 920 * We should NOT get these here, but in a 921 * ASCONF-ACK. 922 */ 923 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 924 error_type); 925 break; 926 case SCTP_CAUSE_OUT_OF_RESC: 927 /* 928 * And what, pray tell do we do with the fact that 929 * the peer is out of resources? Not really sure we 930 * could do anything but abort. I suspect this 931 * should have came WITH an abort instead of in a 932 * OP-ERROR. 933 */ 934 break; 935 default: 936 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 937 error_type); 938 break; 939 } 940 adjust = SCTP_SIZE32(error_len); 941 chklen -= adjust; 942 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 943 } 944 return (0); 945} 946 947static int 948sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 949 struct sctphdr *sh, struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 950 struct sctp_nets *net, int *abort_no_unlock, uint32_t vrf_id) 951{ 952 struct sctp_init_ack *init_ack; 953 struct mbuf *op_err; 954 955 SCTPDBG(SCTP_DEBUG_INPUT2, 956 "sctp_handle_init_ack: handling INIT-ACK\n"); 957 958 if (stcb == NULL) { 959 SCTPDBG(SCTP_DEBUG_INPUT2, 960 "sctp_handle_init_ack: TCB is null\n"); 961 return (-1); 962 } 963 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 964 /* Invalid length */ 965 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 966 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 967 op_err, 0); 968 *abort_no_unlock = 1; 969 return (-1); 970 } 971 init_ack = &cp->init; 972 /* validate parameters */ 973 if (init_ack->initiate_tag == 0) { 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 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 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_inbound_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 if (init_ack->num_outbound_streams == 0) { 998 /* protocol error... send an abort */ 999 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1000 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, sh, 1001 op_err, 0); 1002 *abort_no_unlock = 1; 1003 return (-1); 1004 } 1005 /* process according to association state... */ 1006 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1007 case SCTP_STATE_COOKIE_WAIT: 1008 /* this is the expected state for this chunk */ 1009 /* process the INIT-ACK parameters */ 1010 if (stcb->asoc.primary_destination->dest_state & 1011 SCTP_ADDR_UNCONFIRMED) { 1012 /* 1013 * The primary is where we sent the INIT, we can 1014 * always consider it confirmed when the INIT-ACK is 1015 * returned. Do this before we load addresses 1016 * though. 1017 */ 1018 stcb->asoc.primary_destination->dest_state &= 1019 ~SCTP_ADDR_UNCONFIRMED; 1020 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1021 stcb, 0, (void *)stcb->asoc.primary_destination); 1022 } 1023 if (sctp_process_init_ack(m, iphlen, offset, sh, cp, stcb, 1024 net, abort_no_unlock, vrf_id) < 0) { 1025 /* error in parsing parameters */ 1026 return (-1); 1027 } 1028 /* update our state */ 1029 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1030 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1031 1032 /* reset the RTO calc */ 1033 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 1034 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1035 stcb->asoc.overall_error_count, 1036 0, 1037 SCTP_FROM_SCTP_INPUT, 1038 __LINE__); 1039 } 1040 stcb->asoc.overall_error_count = 0; 1041 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1042 /* 1043 * collapse the init timer back in case of a exponential 1044 * backoff 1045 */ 1046 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1047 stcb, net); 1048 /* 1049 * the send at the end of the inbound data processing will 1050 * cause the cookie to be sent 1051 */ 1052 break; 1053 case SCTP_STATE_SHUTDOWN_SENT: 1054 /* incorrect state... discard */ 1055 break; 1056 case SCTP_STATE_COOKIE_ECHOED: 1057 /* incorrect state... discard */ 1058 break; 1059 case SCTP_STATE_OPEN: 1060 /* incorrect state... discard */ 1061 break; 1062 case SCTP_STATE_EMPTY: 1063 case SCTP_STATE_INUSE: 1064 default: 1065 /* incorrect state... discard */ 1066 return (-1); 1067 break; 1068 } 1069 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1070 return (0); 1071} 1072 1073 1074/* 1075 * handle a state cookie for an existing association m: input packet mbuf 1076 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1077 * "split" mbuf and the cookie signature does not exist offset: offset into 1078 * mbuf to the cookie-echo chunk 1079 */ 1080static struct sctp_tcb * 1081sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1082 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1083 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 1084 struct sockaddr *init_src, int *notification, sctp_assoc_t * sac_assoc_id, 1085 uint32_t vrf_id) 1086{ 1087 struct sctp_association *asoc; 1088 struct sctp_init_chunk *init_cp, init_buf; 1089 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1090 int chk_length; 1091 int init_offset, initack_offset, i; 1092 int retval; 1093 int spec_flag = 0; 1094 uint32_t how_indx; 1095 1096 /* I know that the TCB is non-NULL from the caller */ 1097 asoc = &stcb->asoc; 1098 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1099 if (asoc->cookie_how[how_indx] == 0) 1100 break; 1101 } 1102 if (how_indx < sizeof(asoc->cookie_how)) { 1103 asoc->cookie_how[how_indx] = 1; 1104 } 1105 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1106 /* SHUTDOWN came in after sending INIT-ACK */ 1107 struct mbuf *op_err; 1108 struct sctp_paramhdr *ph; 1109 1110 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1111 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1112 0, M_DONTWAIT, 1, MT_DATA); 1113 if (op_err == NULL) { 1114 /* FOOBAR */ 1115 return (NULL); 1116 } 1117 /* pre-reserve some space */ 1118 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1119 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1120 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1121 /* Set the len */ 1122 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1123 ph = mtod(op_err, struct sctp_paramhdr *); 1124 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1125 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1126 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 1127 vrf_id); 1128 if (how_indx < sizeof(asoc->cookie_how)) 1129 asoc->cookie_how[how_indx] = 2; 1130 return (NULL); 1131 } 1132 /* 1133 * find and validate the INIT chunk in the cookie (peer's info) the 1134 * INIT should start after the cookie-echo header struct (chunk 1135 * header, state cookie header struct) 1136 */ 1137 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1138 1139 init_cp = (struct sctp_init_chunk *) 1140 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1141 (uint8_t *) & init_buf); 1142 if (init_cp == NULL) { 1143 /* could not pull a INIT chunk in cookie */ 1144 return (NULL); 1145 } 1146 chk_length = ntohs(init_cp->ch.chunk_length); 1147 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1148 return (NULL); 1149 } 1150 /* 1151 * find and validate the INIT-ACK chunk in the cookie (my info) the 1152 * INIT-ACK follows the INIT chunk 1153 */ 1154 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1155 initack_cp = (struct sctp_init_ack_chunk *) 1156 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1157 (uint8_t *) & initack_buf); 1158 if (initack_cp == NULL) { 1159 /* could not pull INIT-ACK chunk in cookie */ 1160 return (NULL); 1161 } 1162 chk_length = ntohs(initack_cp->ch.chunk_length); 1163 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1164 return (NULL); 1165 } 1166 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1167 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1168 /* 1169 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1170 * to get into the OPEN state 1171 */ 1172 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1173#ifdef INVARIANTS 1174 panic("Case D and non-match seq?"); 1175#else 1176 SCTP_PRINTF("Case D, seq non-match %x vs %x?\n", 1177 ntohl(initack_cp->init.initial_tsn), 1178 asoc->init_seq_number); 1179#endif 1180 } 1181 switch SCTP_GET_STATE 1182 (asoc) { 1183 case SCTP_STATE_COOKIE_WAIT: 1184 case SCTP_STATE_COOKIE_ECHOED: 1185 /* 1186 * INIT was sent but got a COOKIE_ECHO with the 1187 * correct tags... just accept it...but we must 1188 * process the init so that we can make sure we have 1189 * the right seq no's. 1190 */ 1191 /* First we must process the INIT !! */ 1192 retval = sctp_process_init(init_cp, stcb, net); 1193 if (retval < 0) { 1194 if (how_indx < sizeof(asoc->cookie_how)) 1195 asoc->cookie_how[how_indx] = 3; 1196 return (NULL); 1197 } 1198 /* we have already processed the INIT so no problem */ 1199 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1200 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1201 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1202 /* update current state */ 1203 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1204 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1205 else 1206 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1207 1208 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1209 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1210 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1211 stcb->sctp_ep, stcb, asoc->primary_destination); 1212 } 1213 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1214 sctp_stop_all_cookie_timers(stcb); 1215 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1216 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1217 (inp->sctp_socket->so_qlimit == 0) 1218 ) { 1219 /* 1220 * Here is where collision would go if we 1221 * did a connect() and instead got a 1222 * init/init-ack/cookie done before the 1223 * init-ack came back.. 1224 */ 1225 stcb->sctp_ep->sctp_flags |= 1226 SCTP_PCB_FLAGS_CONNECTED; 1227 soisconnected(stcb->sctp_ep->sctp_socket); 1228 } 1229 /* notify upper layer */ 1230 *notification = SCTP_NOTIFY_ASSOC_UP; 1231 /* 1232 * since we did not send a HB make sure we don't 1233 * double things 1234 */ 1235 net->hb_responded = 1; 1236 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1237 &cookie->time_entered, sctp_align_unsafe_makecopy); 1238 1239 if (stcb->asoc.sctp_autoclose_ticks && 1240 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1241 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1242 inp, stcb, NULL); 1243 } 1244 break; 1245 default: 1246 /* 1247 * we're in the OPEN state (or beyond), so peer must 1248 * have simply lost the COOKIE-ACK 1249 */ 1250 break; 1251 } /* end switch */ 1252 sctp_stop_all_cookie_timers(stcb); 1253 /* 1254 * We ignore the return code here.. not sure if we should 1255 * somehow abort.. but we do have an existing asoc. This 1256 * really should not fail. 1257 */ 1258 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1259 init_offset + sizeof(struct sctp_init_chunk), 1260 initack_offset, sh, init_src)) { 1261 if (how_indx < sizeof(asoc->cookie_how)) 1262 asoc->cookie_how[how_indx] = 4; 1263 return (NULL); 1264 } 1265 /* respond with a COOKIE-ACK */ 1266 sctp_toss_old_cookies(stcb, asoc); 1267 sctp_send_cookie_ack(stcb); 1268 if (how_indx < sizeof(asoc->cookie_how)) 1269 asoc->cookie_how[how_indx] = 5; 1270 return (stcb); 1271 } 1272 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1273 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1274 cookie->tie_tag_my_vtag == 0 && 1275 cookie->tie_tag_peer_vtag == 0) { 1276 /* 1277 * case C in Section 5.2.4 Table 2: XMOO silently discard 1278 */ 1279 if (how_indx < sizeof(asoc->cookie_how)) 1280 asoc->cookie_how[how_indx] = 6; 1281 return (NULL); 1282 } 1283 if (ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag && 1284 (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag || 1285 init_cp->init.initiate_tag == 0)) { 1286 /* 1287 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1288 * should be ok, re-accept peer info 1289 */ 1290 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1291 /* 1292 * Extension of case C. If we hit this, then the 1293 * random number generator returned the same vtag 1294 * when we first sent our INIT-ACK and when we later 1295 * sent our INIT. The side with the seq numbers that 1296 * are different will be the one that normnally 1297 * would have hit case C. This in effect "extends" 1298 * our vtags in this collision case to be 64 bits. 1299 * The same collision could occur aka you get both 1300 * vtag and seq number the same twice in a row.. but 1301 * is much less likely. If it did happen then we 1302 * would proceed through and bring up the assoc.. we 1303 * may end up with the wrong stream setup however.. 1304 * which would be bad.. but there is no way to 1305 * tell.. until we send on a stream that does not 1306 * exist :-) 1307 */ 1308 if (how_indx < sizeof(asoc->cookie_how)) 1309 asoc->cookie_how[how_indx] = 7; 1310 1311 return (NULL); 1312 } 1313 if (how_indx < sizeof(asoc->cookie_how)) 1314 asoc->cookie_how[how_indx] = 8; 1315 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1316 sctp_stop_all_cookie_timers(stcb); 1317 /* 1318 * since we did not send a HB make sure we don't double 1319 * things 1320 */ 1321 net->hb_responded = 1; 1322 if (stcb->asoc.sctp_autoclose_ticks && 1323 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1324 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1325 NULL); 1326 } 1327 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1328 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1329 1330 /* Note last_cwr_tsn? where is this used? */ 1331 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1332 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1333 /* 1334 * Ok the peer probably discarded our data (if we 1335 * echoed a cookie+data). So anything on the 1336 * sent_queue should be marked for retransmit, we 1337 * may not get something to kick us so it COULD 1338 * still take a timeout to move these.. but it can't 1339 * hurt to mark them. 1340 */ 1341 struct sctp_tmit_chunk *chk; 1342 1343 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1344 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1345 chk->sent = SCTP_DATAGRAM_RESEND; 1346 sctp_flight_size_decrease(chk); 1347 sctp_total_flight_decrease(stcb, chk); 1348 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1349 spec_flag++; 1350 } 1351 } 1352 1353 } 1354 /* process the INIT info (peer's info) */ 1355 retval = sctp_process_init(init_cp, stcb, net); 1356 if (retval < 0) { 1357 if (how_indx < sizeof(asoc->cookie_how)) 1358 asoc->cookie_how[how_indx] = 9; 1359 return (NULL); 1360 } 1361 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1362 init_offset + sizeof(struct sctp_init_chunk), 1363 initack_offset, sh, init_src)) { 1364 if (how_indx < sizeof(asoc->cookie_how)) 1365 asoc->cookie_how[how_indx] = 10; 1366 return (NULL); 1367 } 1368 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1369 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1370 *notification = SCTP_NOTIFY_ASSOC_UP; 1371 1372 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1373 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1374 (inp->sctp_socket->so_qlimit == 0)) { 1375 stcb->sctp_ep->sctp_flags |= 1376 SCTP_PCB_FLAGS_CONNECTED; 1377 soisconnected(stcb->sctp_ep->sctp_socket); 1378 } 1379 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1380 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1381 else 1382 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1383 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1384 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1385 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1386 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1387 } else { 1388 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1389 } 1390 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1391 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1392 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1393 stcb->sctp_ep, stcb, asoc->primary_destination); 1394 1395 } 1396 sctp_stop_all_cookie_timers(stcb); 1397 sctp_toss_old_cookies(stcb, asoc); 1398 sctp_send_cookie_ack(stcb); 1399 if (spec_flag) { 1400 /* 1401 * only if we have retrans set do we do this. What 1402 * this call does is get only the COOKIE-ACK out and 1403 * then when we return the normal call to 1404 * sctp_chunk_output will get the retrans out behind 1405 * this. 1406 */ 1407 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK); 1408 } 1409 if (how_indx < sizeof(asoc->cookie_how)) 1410 asoc->cookie_how[how_indx] = 11; 1411 1412 return (stcb); 1413 } 1414 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1415 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1416 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1417 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1418 cookie->tie_tag_peer_vtag != 0) { 1419 struct sctpasochead *head; 1420 1421 /* 1422 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1423 */ 1424 /* temp code */ 1425 if (how_indx < sizeof(asoc->cookie_how)) 1426 asoc->cookie_how[how_indx] = 12; 1427 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1428 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1429 1430 *sac_assoc_id = sctp_get_associd(stcb); 1431 /* notify upper layer */ 1432 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1433 atomic_add_int(&stcb->asoc.refcnt, 1); 1434 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1435 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1436 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1437 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1438 } 1439 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1440 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1441 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1442 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1443 } 1444 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1445 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1446 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1447 stcb->sctp_ep, stcb, asoc->primary_destination); 1448 1449 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1450 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1451 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1452 } 1453 asoc->pre_open_streams = 1454 ntohs(initack_cp->init.num_outbound_streams); 1455 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1456 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1457 1458 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1459 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1460 1461 asoc->str_reset_seq_in = asoc->init_seq_number; 1462 1463 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1464 if (asoc->mapping_array) { 1465 memset(asoc->mapping_array, 0, 1466 asoc->mapping_array_size); 1467 } 1468 SCTP_TCB_UNLOCK(stcb); 1469 SCTP_INP_INFO_WLOCK(); 1470 SCTP_INP_WLOCK(stcb->sctp_ep); 1471 SCTP_TCB_LOCK(stcb); 1472 atomic_add_int(&stcb->asoc.refcnt, -1); 1473 /* send up all the data */ 1474 SCTP_TCB_SEND_LOCK(stcb); 1475 1476 sctp_report_all_outbound(stcb, 1); 1477 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1478 stcb->asoc.strmout[i].stream_no = i; 1479 stcb->asoc.strmout[i].next_sequence_sent = 0; 1480 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1481 } 1482 /* process the INIT-ACK info (my info) */ 1483 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1484 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1485 1486 /* pull from vtag hash */ 1487 LIST_REMOVE(stcb, sctp_asocs); 1488 /* re-insert to new vtag position */ 1489 head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1490 sctppcbinfo.hashasocmark)]; 1491 /* 1492 * put it in the bucket in the vtag hash of assoc's for the 1493 * system 1494 */ 1495 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1496 1497 /* Is this the first restart? */ 1498 if (stcb->asoc.in_restart_hash == 0) { 1499 /* Ok add it to assoc_id vtag hash */ 1500 head = &sctppcbinfo.sctp_restarthash[SCTP_PCBHASH_ASOC(stcb->asoc.assoc_id, 1501 sctppcbinfo.hashrestartmark)]; 1502 LIST_INSERT_HEAD(head, stcb, sctp_tcbrestarhash); 1503 stcb->asoc.in_restart_hash = 1; 1504 } 1505 /* process the INIT info (peer's info) */ 1506 SCTP_TCB_SEND_UNLOCK(stcb); 1507 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1508 SCTP_INP_INFO_WUNLOCK(); 1509 1510 retval = sctp_process_init(init_cp, stcb, net); 1511 if (retval < 0) { 1512 if (how_indx < sizeof(asoc->cookie_how)) 1513 asoc->cookie_how[how_indx] = 13; 1514 1515 return (NULL); 1516 } 1517 /* 1518 * since we did not send a HB make sure we don't double 1519 * things 1520 */ 1521 net->hb_responded = 1; 1522 1523 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1524 init_offset + sizeof(struct sctp_init_chunk), 1525 initack_offset, sh, init_src)) { 1526 if (how_indx < sizeof(asoc->cookie_how)) 1527 asoc->cookie_how[how_indx] = 14; 1528 1529 return (NULL); 1530 } 1531 /* respond with a COOKIE-ACK */ 1532 sctp_stop_all_cookie_timers(stcb); 1533 sctp_toss_old_cookies(stcb, asoc); 1534 sctp_send_cookie_ack(stcb); 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 15; 1537 1538 return (stcb); 1539 } 1540 if (how_indx < sizeof(asoc->cookie_how)) 1541 asoc->cookie_how[how_indx] = 16; 1542 /* all other cases... */ 1543 return (NULL); 1544} 1545 1546 1547/* 1548 * handle a state cookie for a new association m: input packet mbuf chain-- 1549 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1550 * and the cookie signature does not exist offset: offset into mbuf to the 1551 * cookie-echo chunk length: length of the cookie chunk to: where the init 1552 * was from returns a new TCB 1553 */ 1554static struct sctp_tcb * 1555sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1556 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1557 struct sctp_inpcb *inp, struct sctp_nets **netp, 1558 struct sockaddr *init_src, int *notification, 1559 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1560 uint32_t vrf_id) 1561{ 1562 struct sctp_tcb *stcb; 1563 struct sctp_init_chunk *init_cp, init_buf; 1564 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1565 struct sockaddr_storage sa_store; 1566 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 1567 struct sockaddr_in *sin; 1568 struct sockaddr_in6 *sin6; 1569 struct sctp_association *asoc; 1570 int chk_length; 1571 int init_offset, initack_offset, initack_limit; 1572 int retval; 1573 int error = 0; 1574 uint32_t old_tag; 1575 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 1576 1577 /* 1578 * find and validate the INIT chunk in the cookie (peer's info) the 1579 * INIT should start after the cookie-echo header struct (chunk 1580 * header, state cookie header struct) 1581 */ 1582 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1583 init_cp = (struct sctp_init_chunk *) 1584 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1585 (uint8_t *) & init_buf); 1586 if (init_cp == NULL) { 1587 /* could not pull a INIT chunk in cookie */ 1588 SCTPDBG(SCTP_DEBUG_INPUT1, 1589 "process_cookie_new: could not pull INIT chunk hdr\n"); 1590 return (NULL); 1591 } 1592 chk_length = ntohs(init_cp->ch.chunk_length); 1593 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1594 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1595 return (NULL); 1596 } 1597 initack_offset = init_offset + SCTP_SIZE32(chk_length); 1598 /* 1599 * find and validate the INIT-ACK chunk in the cookie (my info) the 1600 * INIT-ACK follows the INIT chunk 1601 */ 1602 initack_cp = (struct sctp_init_ack_chunk *) 1603 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1604 (uint8_t *) & initack_buf); 1605 if (initack_cp == NULL) { 1606 /* could not pull INIT-ACK chunk in cookie */ 1607 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1608 return (NULL); 1609 } 1610 chk_length = ntohs(initack_cp->ch.chunk_length); 1611 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1612 return (NULL); 1613 } 1614 /* 1615 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1616 * "initack_limit" value. This is because the chk_length field 1617 * includes the length of the cookie, but the cookie is omitted when 1618 * the INIT and INIT_ACK are tacked onto the cookie... 1619 */ 1620 initack_limit = offset + cookie_len; 1621 1622 /* 1623 * now that we know the INIT/INIT-ACK are in place, create a new TCB 1624 * and popluate 1625 */ 1626 1627 /* 1628 * Here we do a trick, we set in NULL for the proc/thread argument. 1629 * We do this since in effect we only use the p argument when the 1630 * socket is unbound and we must do an implicit bind. Since we are 1631 * getting a cookie, we cannot be unbound. 1632 */ 1633 stcb = sctp_aloc_assoc(inp, init_src, 0, &error, 1634 ntohl(initack_cp->init.initiate_tag), vrf_id, 1635 (struct thread *)NULL 1636 ); 1637 if (stcb == NULL) { 1638 struct mbuf *op_err; 1639 1640 /* memory problem? */ 1641 SCTPDBG(SCTP_DEBUG_INPUT1, 1642 "process_cookie_new: no room for another TCB!\n"); 1643 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1644 1645 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1646 sh, op_err, vrf_id); 1647 return (NULL); 1648 } 1649 /* get the correct sctp_nets */ 1650 if (netp) 1651 *netp = sctp_findnet(stcb, init_src); 1652 1653 asoc = &stcb->asoc; 1654 /* get scope variables out of cookie */ 1655 asoc->ipv4_local_scope = cookie->ipv4_scope; 1656 asoc->site_scope = cookie->site_scope; 1657 asoc->local_scope = cookie->local_scope; 1658 asoc->loopback_scope = cookie->loopback_scope; 1659 1660 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 1661 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 1662 struct mbuf *op_err; 1663 1664 /* 1665 * Houston we have a problem. The EP changed while the 1666 * cookie was in flight. Only recourse is to abort the 1667 * association. 1668 */ 1669 atomic_add_int(&stcb->asoc.refcnt, 1); 1670 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 1671 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 1672 sh, op_err, vrf_id); 1673 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 1674 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1675 atomic_add_int(&stcb->asoc.refcnt, -1); 1676 return (NULL); 1677 } 1678 /* process the INIT-ACK info (my info) */ 1679 old_tag = asoc->my_vtag; 1680 asoc->assoc_id = asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1681 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1682 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1683 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1684 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1685 asoc->last_cwr_tsn = asoc->init_seq_number - 1; 1686 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1687 asoc->str_reset_seq_in = asoc->init_seq_number; 1688 1689 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1690 1691 /* process the INIT info (peer's info) */ 1692 if (netp) 1693 retval = sctp_process_init(init_cp, stcb, *netp); 1694 else 1695 retval = 0; 1696 if (retval < 0) { 1697 atomic_add_int(&stcb->asoc.refcnt, 1); 1698 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1699 atomic_add_int(&stcb->asoc.refcnt, -1); 1700 return (NULL); 1701 } 1702 /* load all addresses */ 1703 if (sctp_load_addresses_from_init(stcb, m, iphlen, 1704 init_offset + sizeof(struct sctp_init_chunk), initack_offset, sh, 1705 init_src)) { 1706 atomic_add_int(&stcb->asoc.refcnt, 1); 1707 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1708 atomic_add_int(&stcb->asoc.refcnt, -1); 1709 return (NULL); 1710 } 1711 /* 1712 * verify any preceding AUTH chunk that was skipped 1713 */ 1714 /* pull the local authentication parameters from the cookie/init-ack */ 1715 sctp_auth_get_cookie_params(stcb, m, 1716 initack_offset + sizeof(struct sctp_init_ack_chunk), 1717 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 1718 if (auth_skipped) { 1719 struct sctp_auth_chunk *auth; 1720 1721 auth = (struct sctp_auth_chunk *) 1722 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 1723 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 1724 /* auth HMAC failed, dump the assoc and packet */ 1725 SCTPDBG(SCTP_DEBUG_AUTH1, 1726 "COOKIE-ECHO: AUTH failed\n"); 1727 atomic_add_int(&stcb->asoc.refcnt, 1); 1728 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 1729 atomic_add_int(&stcb->asoc.refcnt, -1); 1730 return (NULL); 1731 } else { 1732 /* remaining chunks checked... good to go */ 1733 stcb->asoc.authenticated = 1; 1734 } 1735 } 1736 /* update current state */ 1737 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 1738 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1739 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1740 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1741 stcb->sctp_ep, stcb, asoc->primary_destination); 1742 } 1743 sctp_stop_all_cookie_timers(stcb); 1744 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 1745 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1746 1747 /* 1748 * if we're doing ASCONFs, check to see if we have any new local 1749 * addresses that need to get added to the peer (eg. addresses 1750 * changed while cookie echo in flight). This needs to be done 1751 * after we go to the OPEN state to do the correct asconf 1752 * processing. else, make sure we have the correct addresses in our 1753 * lists 1754 */ 1755 1756 /* warning, we re-use sin, sin6, sa_store here! */ 1757 /* pull in local_address (our "from" address) */ 1758 if (cookie->laddr_type == SCTP_IPV4_ADDRESS) { 1759 /* source addr is IPv4 */ 1760 sin = (struct sockaddr_in *)initack_src; 1761 memset(sin, 0, sizeof(*sin)); 1762 sin->sin_family = AF_INET; 1763 sin->sin_len = sizeof(struct sockaddr_in); 1764 sin->sin_addr.s_addr = cookie->laddress[0]; 1765 } else if (cookie->laddr_type == SCTP_IPV6_ADDRESS) { 1766 /* source addr is IPv6 */ 1767 sin6 = (struct sockaddr_in6 *)initack_src; 1768 memset(sin6, 0, sizeof(*sin6)); 1769 sin6->sin6_family = AF_INET6; 1770 sin6->sin6_len = sizeof(struct sockaddr_in6); 1771 sin6->sin6_scope_id = cookie->scope_id; 1772 memcpy(&sin6->sin6_addr, cookie->laddress, 1773 sizeof(sin6->sin6_addr)); 1774 } else { 1775 atomic_add_int(&stcb->asoc.refcnt, 1); 1776 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 1777 atomic_add_int(&stcb->asoc.refcnt, -1); 1778 return (NULL); 1779 } 1780 1781 sctp_check_address_list(stcb, m, 1782 initack_offset + sizeof(struct sctp_init_ack_chunk), 1783 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 1784 initack_src, cookie->local_scope, cookie->site_scope, 1785 cookie->ipv4_scope, cookie->loopback_scope); 1786 1787 1788 /* set up to notify upper layer */ 1789 *notification = SCTP_NOTIFY_ASSOC_UP; 1790 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1791 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1792 (inp->sctp_socket->so_qlimit == 0)) { 1793 /* 1794 * This is an endpoint that called connect() how it got a 1795 * cookie that is NEW is a bit of a mystery. It must be that 1796 * the INIT was sent, but before it got there.. a complete 1797 * INIT/INIT-ACK/COOKIE arrived. But of course then it 1798 * should have went to the other code.. not here.. oh well.. 1799 * a bit of protection is worth having.. 1800 */ 1801 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1802 soisconnected(stcb->sctp_ep->sctp_socket); 1803 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 1804 (inp->sctp_socket->so_qlimit)) { 1805 /* 1806 * We don't want to do anything with this one. Since it is 1807 * the listening guy. The timer will get started for 1808 * accepted connections in the caller. 1809 */ 1810 ; 1811 } 1812 /* since we did not send a HB make sure we don't double things */ 1813 if ((netp) && (*netp)) 1814 (*netp)->hb_responded = 1; 1815 1816 if (stcb->asoc.sctp_autoclose_ticks && 1817 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1818 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1819 } 1820 /* respond with a COOKIE-ACK */ 1821 /* calculate the RTT */ 1822 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1823 if ((netp) && (*netp)) { 1824 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 1825 &cookie->time_entered, sctp_align_unsafe_makecopy); 1826 } 1827 sctp_send_cookie_ack(stcb); 1828 return (stcb); 1829} 1830 1831 1832/* 1833 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 1834 * existing (non-NULL) TCB 1835 */ 1836static struct mbuf * 1837sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 1838 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 1839 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 1840 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1841 struct sctp_tcb **locked_tcb, uint32_t vrf_id) 1842{ 1843 struct sctp_state_cookie *cookie; 1844 struct sockaddr_in6 sin6; 1845 struct sockaddr_in sin; 1846 struct sctp_tcb *l_stcb = *stcb; 1847 struct sctp_inpcb *l_inp; 1848 struct sockaddr *to; 1849 sctp_assoc_t sac_restart_id; 1850 struct sctp_pcb *ep; 1851 struct mbuf *m_sig; 1852 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 1853 uint8_t *sig; 1854 uint8_t cookie_ok = 0; 1855 unsigned int size_of_pkt, sig_offset, cookie_offset; 1856 unsigned int cookie_len; 1857 struct timeval now; 1858 struct timeval time_expires; 1859 struct sockaddr_storage dest_store; 1860 struct sockaddr *localep_sa = (struct sockaddr *)&dest_store; 1861 struct ip *iph; 1862 int notification = 0; 1863 struct sctp_nets *netl; 1864 int had_a_existing_tcb = 0; 1865 1866 SCTPDBG(SCTP_DEBUG_INPUT2, 1867 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 1868 1869 if (inp_p == NULL) { 1870 return (NULL); 1871 } 1872 /* First get the destination address setup too. */ 1873 iph = mtod(m, struct ip *); 1874 if (iph->ip_v == IPVERSION) { 1875 /* its IPv4 */ 1876 struct sockaddr_in *lsin; 1877 1878 lsin = (struct sockaddr_in *)(localep_sa); 1879 memset(lsin, 0, sizeof(*lsin)); 1880 lsin->sin_family = AF_INET; 1881 lsin->sin_len = sizeof(*lsin); 1882 lsin->sin_port = sh->dest_port; 1883 lsin->sin_addr.s_addr = iph->ip_dst.s_addr; 1884 size_of_pkt = SCTP_GET_IPV4_LENGTH(iph); 1885 } else if (iph->ip_v == (IPV6_VERSION >> 4)) { 1886 /* its IPv6 */ 1887 struct ip6_hdr *ip6; 1888 struct sockaddr_in6 *lsin6; 1889 1890 lsin6 = (struct sockaddr_in6 *)(localep_sa); 1891 memset(lsin6, 0, sizeof(*lsin6)); 1892 lsin6->sin6_family = AF_INET6; 1893 lsin6->sin6_len = sizeof(struct sockaddr_in6); 1894 ip6 = mtod(m, struct ip6_hdr *); 1895 lsin6->sin6_port = sh->dest_port; 1896 lsin6->sin6_addr = ip6->ip6_dst; 1897 size_of_pkt = SCTP_GET_IPV6_LENGTH(ip6) + iphlen; 1898 } else { 1899 return (NULL); 1900 } 1901 1902 cookie = &cp->cookie; 1903 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 1904 cookie_len = ntohs(cp->ch.chunk_length); 1905 1906 if ((cookie->peerport != sh->src_port) && 1907 (cookie->myport != sh->dest_port) && 1908 (cookie->my_vtag != sh->v_tag)) { 1909 /* 1910 * invalid ports or bad tag. Note that we always leave the 1911 * v_tag in the header in network order and when we stored 1912 * it in the my_vtag slot we also left it in network order. 1913 * This maintains the match even though it may be in the 1914 * opposite byte order of the machine :-> 1915 */ 1916 return (NULL); 1917 } 1918 if (cookie_len > size_of_pkt || 1919 cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 1920 sizeof(struct sctp_init_chunk) + 1921 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 1922 /* cookie too long! or too small */ 1923 return (NULL); 1924 } 1925 /* 1926 * split off the signature into its own mbuf (since it should not be 1927 * calculated in the sctp_hmac_m() call). 1928 */ 1929 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 1930 if (sig_offset > size_of_pkt) { 1931 /* packet not correct size! */ 1932 /* XXX this may already be accounted for earlier... */ 1933 return (NULL); 1934 } 1935 m_sig = m_split(m, sig_offset, M_DONTWAIT); 1936 if (m_sig == NULL) { 1937 /* out of memory or ?? */ 1938 return (NULL); 1939 } 1940 /* 1941 * compute the signature/digest for the cookie 1942 */ 1943 ep = &(*inp_p)->sctp_ep; 1944 l_inp = *inp_p; 1945 if (l_stcb) { 1946 SCTP_TCB_UNLOCK(l_stcb); 1947 } 1948 SCTP_INP_RLOCK(l_inp); 1949 if (l_stcb) { 1950 SCTP_TCB_LOCK(l_stcb); 1951 } 1952 /* which cookie is it? */ 1953 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 1954 (ep->current_secret_number != ep->last_secret_number)) { 1955 /* it's the old cookie */ 1956 (void)sctp_hmac_m(SCTP_HMAC, 1957 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1958 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 1959 } else { 1960 /* it's the current cookie */ 1961 (void)sctp_hmac_m(SCTP_HMAC, 1962 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 1963 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 1964 } 1965 /* get the signature */ 1966 SCTP_INP_RUNLOCK(l_inp); 1967 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 1968 if (sig == NULL) { 1969 /* couldn't find signature */ 1970 sctp_m_freem(m_sig); 1971 return (NULL); 1972 } 1973 /* compare the received digest with the computed digest */ 1974 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 1975 /* try the old cookie? */ 1976 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 1977 (ep->current_secret_number != ep->last_secret_number)) { 1978 /* compute digest with old */ 1979 (void)sctp_hmac_m(SCTP_HMAC, 1980 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 1981 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 1982 /* compare */ 1983 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 1984 cookie_ok = 1; 1985 } 1986 } else { 1987 cookie_ok = 1; 1988 } 1989 1990 /* 1991 * Now before we continue we must reconstruct our mbuf so that 1992 * normal processing of any other chunks will work. 1993 */ 1994 { 1995 struct mbuf *m_at; 1996 1997 m_at = m; 1998 while (SCTP_BUF_NEXT(m_at) != NULL) { 1999 m_at = SCTP_BUF_NEXT(m_at); 2000 } 2001 SCTP_BUF_NEXT(m_at) = m_sig; 2002 } 2003 2004 if (cookie_ok == 0) { 2005 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2006 SCTPDBG(SCTP_DEBUG_INPUT2, 2007 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2008 (uint32_t) offset, cookie_offset, sig_offset); 2009 return (NULL); 2010 } 2011 /* 2012 * check the cookie timestamps to be sure it's not stale 2013 */ 2014 (void)SCTP_GETTIME_TIMEVAL(&now); 2015 /* Expire time is in Ticks, so we convert to seconds */ 2016 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2017 time_expires.tv_usec = cookie->time_entered.tv_usec; 2018 if (timevalcmp(&now, &time_expires, >)) { 2019 /* cookie is stale! */ 2020 struct mbuf *op_err; 2021 struct sctp_stale_cookie_msg *scm; 2022 uint32_t tim; 2023 2024 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2025 0, M_DONTWAIT, 1, MT_DATA); 2026 if (op_err == NULL) { 2027 /* FOOBAR */ 2028 return (NULL); 2029 } 2030 /* pre-reserve some space */ 2031 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 2032 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 2033 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 2034 2035 /* Set the len */ 2036 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2037 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2038 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2039 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2040 (sizeof(uint32_t)))); 2041 /* seconds to usec */ 2042 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2043 /* add in usec */ 2044 if (tim == 0) 2045 tim = now.tv_usec - cookie->time_entered.tv_usec; 2046 scm->time_usec = htonl(tim); 2047 sctp_send_operr_to(m, iphlen, op_err, cookie->peers_vtag, 2048 vrf_id); 2049 return (NULL); 2050 } 2051 /* 2052 * Now we must see with the lookup address if we have an existing 2053 * asoc. This will only happen if we were in the COOKIE-WAIT state 2054 * and a INIT collided with us and somewhere the peer sent the 2055 * cookie on another address besides the single address our assoc 2056 * had for him. In this case we will have one of the tie-tags set at 2057 * least AND the address field in the cookie can be used to look it 2058 * up. 2059 */ 2060 to = NULL; 2061 if (cookie->addr_type == SCTP_IPV6_ADDRESS) { 2062 memset(&sin6, 0, sizeof(sin6)); 2063 sin6.sin6_family = AF_INET6; 2064 sin6.sin6_len = sizeof(sin6); 2065 sin6.sin6_port = sh->src_port; 2066 sin6.sin6_scope_id = cookie->scope_id; 2067 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2068 sizeof(sin6.sin6_addr.s6_addr)); 2069 to = (struct sockaddr *)&sin6; 2070 } else if (cookie->addr_type == SCTP_IPV4_ADDRESS) { 2071 memset(&sin, 0, sizeof(sin)); 2072 sin.sin_family = AF_INET; 2073 sin.sin_len = sizeof(sin); 2074 sin.sin_port = sh->src_port; 2075 sin.sin_addr.s_addr = cookie->address[0]; 2076 to = (struct sockaddr *)&sin; 2077 } else { 2078 /* This should not happen */ 2079 return (NULL); 2080 } 2081 if ((*stcb == NULL) && to) { 2082 /* Yep, lets check */ 2083 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, localep_sa, NULL); 2084 if (*stcb == NULL) { 2085 /* 2086 * We should have only got back the same inp. If we 2087 * got back a different ep we have a problem. The 2088 * original findep got back l_inp and now 2089 */ 2090 if (l_inp != *inp_p) { 2091 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2092 } 2093 } else { 2094 if (*locked_tcb == NULL) { 2095 /* 2096 * In this case we found the assoc only 2097 * after we locked the create lock. This 2098 * means we are in a colliding case and we 2099 * must make sure that we unlock the tcb if 2100 * its one of the cases where we throw away 2101 * the incoming packets. 2102 */ 2103 *locked_tcb = *stcb; 2104 2105 /* 2106 * We must also increment the inp ref count 2107 * since the ref_count flags was set when we 2108 * did not find the TCB, now we found it 2109 * which reduces the refcount.. we must 2110 * raise it back out to balance it all :-) 2111 */ 2112 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2113 if ((*stcb)->sctp_ep != l_inp) { 2114 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2115 (*stcb)->sctp_ep, l_inp); 2116 } 2117 } 2118 } 2119 } 2120 if (to == NULL) 2121 return (NULL); 2122 2123 cookie_len -= SCTP_SIGNATURE_SIZE; 2124 if (*stcb == NULL) { 2125 /* this is the "normal" case... get a new TCB */ 2126 *stcb = sctp_process_cookie_new(m, iphlen, offset, sh, cookie, 2127 cookie_len, *inp_p, netp, to, ¬ification, 2128 auth_skipped, auth_offset, auth_len, vrf_id); 2129 } else { 2130 /* this is abnormal... cookie-echo on existing TCB */ 2131 had_a_existing_tcb = 1; 2132 *stcb = sctp_process_cookie_existing(m, iphlen, offset, sh, 2133 cookie, cookie_len, *inp_p, *stcb, *netp, to, 2134 ¬ification, &sac_restart_id, vrf_id); 2135 } 2136 2137 if (*stcb == NULL) { 2138 /* still no TCB... must be bad cookie-echo */ 2139 return (NULL); 2140 } 2141 /* 2142 * Ok, we built an association so confirm the address we sent the 2143 * INIT-ACK to. 2144 */ 2145 netl = sctp_findnet(*stcb, to); 2146 /* 2147 * This code should in theory NOT run but 2148 */ 2149 if (netl == NULL) { 2150 /* TSNH! Huh, why do I need to add this address here? */ 2151 int ret; 2152 2153 ret = sctp_add_remote_addr(*stcb, to, SCTP_DONOT_SETSCOPE, 2154 SCTP_IN_COOKIE_PROC); 2155 netl = sctp_findnet(*stcb, to); 2156 } 2157 if (netl) { 2158 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2159 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2160 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2161 netl); 2162 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2163 (*stcb), 0, (void *)netl); 2164 } 2165 } 2166 if (*stcb) { 2167 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, *inp_p, 2168 *stcb, NULL); 2169 } 2170 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2171 if (!had_a_existing_tcb || 2172 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2173 /* 2174 * If we have a NEW cookie or the connect never 2175 * reached the connected state during collision we 2176 * must do the TCP accept thing. 2177 */ 2178 struct socket *so, *oso; 2179 struct sctp_inpcb *inp; 2180 2181 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2182 /* 2183 * For a restart we will keep the same 2184 * socket, no need to do anything. I THINK!! 2185 */ 2186 sctp_ulp_notify(notification, *stcb, 0, (void *)&sac_restart_id); 2187 return (m); 2188 } 2189 oso = (*inp_p)->sctp_socket; 2190 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2191 SCTP_TCB_UNLOCK((*stcb)); 2192 so = sonewconn(oso, 0 2193 ); 2194 SCTP_TCB_LOCK((*stcb)); 2195 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2196 2197 if (so == NULL) { 2198 struct mbuf *op_err; 2199 2200 /* Too many sockets */ 2201 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2202 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2203 sctp_abort_association(*inp_p, NULL, m, iphlen, 2204 sh, op_err, vrf_id); 2205 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2206 return (NULL); 2207 } 2208 inp = (struct sctp_inpcb *)so->so_pcb; 2209 SCTP_INP_INCR_REF(inp); 2210 /* 2211 * We add the unbound flag here so that if we get an 2212 * soabort() before we get the move_pcb done, we 2213 * will properly cleanup. 2214 */ 2215 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2216 SCTP_PCB_FLAGS_CONNECTED | 2217 SCTP_PCB_FLAGS_IN_TCPPOOL | 2218 SCTP_PCB_FLAGS_UNBOUND | 2219 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2220 SCTP_PCB_FLAGS_DONT_WAKE); 2221 inp->sctp_features = (*inp_p)->sctp_features; 2222 inp->sctp_socket = so; 2223 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2224 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2225 inp->sctp_context = (*inp_p)->sctp_context; 2226 inp->inp_starting_point_for_iterator = NULL; 2227 /* 2228 * copy in the authentication parameters from the 2229 * original endpoint 2230 */ 2231 if (inp->sctp_ep.local_hmacs) 2232 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2233 inp->sctp_ep.local_hmacs = 2234 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2235 if (inp->sctp_ep.local_auth_chunks) 2236 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2237 inp->sctp_ep.local_auth_chunks = 2238 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2239 (void)sctp_copy_skeylist(&(*inp_p)->sctp_ep.shared_keys, 2240 &inp->sctp_ep.shared_keys); 2241 2242 /* 2243 * Now we must move it from one hash table to 2244 * another and get the tcb in the right place. 2245 */ 2246 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2247 2248 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2249 SCTP_TCB_UNLOCK((*stcb)); 2250 2251 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT); 2252 SCTP_TCB_LOCK((*stcb)); 2253 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2254 2255 2256 /* 2257 * now we must check to see if we were aborted while 2258 * the move was going on and the lock/unlock 2259 * happened. 2260 */ 2261 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2262 /* 2263 * yep it was, we leave the assoc attached 2264 * to the socket since the sctp_inpcb_free() 2265 * call will send an abort for us. 2266 */ 2267 SCTP_INP_DECR_REF(inp); 2268 return (NULL); 2269 } 2270 SCTP_INP_DECR_REF(inp); 2271 /* Switch over to the new guy */ 2272 *inp_p = inp; 2273 sctp_ulp_notify(notification, *stcb, 0, NULL); 2274 2275 /* 2276 * Pull it from the incomplete queue and wake the 2277 * guy 2278 */ 2279 soisconnected(so); 2280 return (m); 2281 } 2282 } 2283 if ((notification) && ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE)) { 2284 sctp_ulp_notify(notification, *stcb, 0, NULL); 2285 } 2286 return (m); 2287} 2288 2289static void 2290sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp, 2291 struct sctp_tcb *stcb, struct sctp_nets *net) 2292{ 2293 /* cp must not be used, others call this without a c-ack :-) */ 2294 struct sctp_association *asoc; 2295 2296 SCTPDBG(SCTP_DEBUG_INPUT2, 2297 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2298 if (stcb == NULL) 2299 return; 2300 2301 asoc = &stcb->asoc; 2302 2303 sctp_stop_all_cookie_timers(stcb); 2304 /* process according to association state */ 2305 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2306 /* state change only needed when I am in right state */ 2307 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2308 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2309 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2310 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2311 stcb->sctp_ep, stcb, asoc->primary_destination); 2312 2313 } 2314 /* update RTO */ 2315 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2316 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2317 if (asoc->overall_error_count == 0) { 2318 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2319 &asoc->time_entered, sctp_align_safe_nocopy); 2320 } 2321 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2322 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL); 2323 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2324 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2325 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2326 soisconnected(stcb->sctp_ep->sctp_socket); 2327 } 2328 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2329 stcb, net); 2330 /* 2331 * since we did not send a HB make sure we don't double 2332 * things 2333 */ 2334 net->hb_responded = 1; 2335 2336 if (stcb->asoc.sctp_autoclose_ticks && 2337 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2338 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2339 stcb->sctp_ep, stcb, NULL); 2340 } 2341 /* 2342 * send ASCONF if parameters are pending and ASCONFs are 2343 * allowed (eg. addresses changed when init/cookie echo were 2344 * in flight) 2345 */ 2346 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2347 (stcb->asoc.peer_supports_asconf) && 2348 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2349#ifdef SCTP_TIMER_BASED_ASCONF 2350 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2351 stcb->sctp_ep, stcb, 2352 stcb->asoc.primary_destination); 2353#else 2354 sctp_send_asconf(stcb, stcb->asoc.primary_destination); 2355#endif 2356 } 2357 } 2358 /* Toss the cookie if I can */ 2359 sctp_toss_old_cookies(stcb, asoc); 2360 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2361 /* Restart the timer if we have pending data */ 2362 struct sctp_tmit_chunk *chk; 2363 2364 chk = TAILQ_FIRST(&asoc->sent_queue); 2365 if (chk) { 2366 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2367 stcb, chk->whoTo); 2368 } 2369 } 2370} 2371 2372static void 2373sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2374 struct sctp_tcb *stcb) 2375{ 2376 struct sctp_nets *net; 2377 struct sctp_tmit_chunk *lchk; 2378 uint32_t tsn; 2379 2380 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_ecne_chunk)) { 2381 return; 2382 } 2383 SCTP_STAT_INCR(sctps_recvecne); 2384 tsn = ntohl(cp->tsn); 2385 /* ECN Nonce stuff: need a resync and disable the nonce sum check */ 2386 /* Also we make sure we disable the nonce_wait */ 2387 lchk = TAILQ_FIRST(&stcb->asoc.send_queue); 2388 if (lchk == NULL) { 2389 stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq; 2390 } else { 2391 stcb->asoc.nonce_resync_tsn = lchk->rec.data.TSN_seq; 2392 } 2393 stcb->asoc.nonce_wait_for_ecne = 0; 2394 stcb->asoc.nonce_sum_check = 0; 2395 2396 /* Find where it was sent, if possible */ 2397 net = NULL; 2398 lchk = TAILQ_FIRST(&stcb->asoc.sent_queue); 2399 while (lchk) { 2400 if (lchk->rec.data.TSN_seq == tsn) { 2401 net = lchk->whoTo; 2402 break; 2403 } 2404 if (compare_with_wrap(lchk->rec.data.TSN_seq, tsn, MAX_SEQ)) 2405 break; 2406 lchk = TAILQ_NEXT(lchk, sctp_next); 2407 } 2408 if (net == NULL) 2409 /* default is we use the primary */ 2410 net = stcb->asoc.primary_destination; 2411 2412 if (compare_with_wrap(tsn, stcb->asoc.last_cwr_tsn, MAX_TSN)) { 2413 /* 2414 * JRS - Use the congestion control given in the pluggable 2415 * CC module 2416 */ 2417 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net); 2418 /* 2419 * we reduce once every RTT. So we will only lower cwnd at 2420 * the next sending seq i.e. the resync_tsn. 2421 */ 2422 stcb->asoc.last_cwr_tsn = stcb->asoc.nonce_resync_tsn; 2423 } 2424 /* 2425 * We always send a CWR this way if our previous one was lost our 2426 * peer will get an update, or if it is not time again to reduce we 2427 * still get the cwr to the peer. 2428 */ 2429 sctp_send_cwr(stcb, net, tsn); 2430} 2431 2432static void 2433sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb) 2434{ 2435 /* 2436 * Here we get a CWR from the peer. We must look in the outqueue and 2437 * make sure that we have a covered ECNE in teh control chunk part. 2438 * If so remove it. 2439 */ 2440 struct sctp_tmit_chunk *chk; 2441 struct sctp_ecne_chunk *ecne; 2442 2443 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 2444 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2445 continue; 2446 } 2447 /* 2448 * Look for and remove if it is the right TSN. Since there 2449 * is only ONE ECNE on the control queue at any one time we 2450 * don't need to worry about more than one! 2451 */ 2452 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2453 if (compare_with_wrap(ntohl(cp->tsn), ntohl(ecne->tsn), 2454 MAX_TSN) || (cp->tsn == ecne->tsn)) { 2455 /* this covers this ECNE, we can remove it */ 2456 stcb->asoc.ecn_echo_cnt_onq--; 2457 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2458 sctp_next); 2459 if (chk->data) { 2460 sctp_m_freem(chk->data); 2461 chk->data = NULL; 2462 } 2463 stcb->asoc.ctrl_queue_cnt--; 2464 sctp_free_a_chunk(stcb, chk); 2465 break; 2466 } 2467 } 2468} 2469 2470static void 2471sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp, 2472 struct sctp_tcb *stcb, struct sctp_nets *net) 2473{ 2474 struct sctp_association *asoc; 2475 2476 SCTPDBG(SCTP_DEBUG_INPUT2, 2477 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2478 if (stcb == NULL) 2479 return; 2480 2481 asoc = &stcb->asoc; 2482 /* process according to association state */ 2483 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2484 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2485 SCTP_TCB_UNLOCK(stcb); 2486 return; 2487 } 2488 /* notify upper layer protocol */ 2489 if (stcb->sctp_socket) { 2490 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL); 2491 /* are the queues empty? they should be */ 2492 if (!TAILQ_EMPTY(&asoc->send_queue) || 2493 !TAILQ_EMPTY(&asoc->sent_queue) || 2494 !TAILQ_EMPTY(&asoc->out_wheel)) { 2495 sctp_report_all_outbound(stcb, 0); 2496 } 2497 } 2498 /* stop the timer */ 2499 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2500 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 2501 /* free the TCB */ 2502 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2503 return; 2504} 2505 2506static int 2507process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 2508 struct sctp_nets *net, uint8_t flg) 2509{ 2510 switch (desc->chunk_type) { 2511 case SCTP_DATA: 2512 /* find the tsn to resend (possibly */ 2513 { 2514 uint32_t tsn; 2515 struct sctp_tmit_chunk *tp1; 2516 2517 tsn = ntohl(desc->tsn_ifany); 2518 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2519 while (tp1) { 2520 if (tp1->rec.data.TSN_seq == tsn) { 2521 /* found it */ 2522 break; 2523 } 2524 if (compare_with_wrap(tp1->rec.data.TSN_seq, tsn, 2525 MAX_TSN)) { 2526 /* not found */ 2527 tp1 = NULL; 2528 break; 2529 } 2530 tp1 = TAILQ_NEXT(tp1, sctp_next); 2531 } 2532 if (tp1 == NULL) { 2533 /* 2534 * Do it the other way , aka without paying 2535 * attention to queue seq order. 2536 */ 2537 SCTP_STAT_INCR(sctps_pdrpdnfnd); 2538 tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue); 2539 while (tp1) { 2540 if (tp1->rec.data.TSN_seq == tsn) { 2541 /* found it */ 2542 break; 2543 } 2544 tp1 = TAILQ_NEXT(tp1, sctp_next); 2545 } 2546 } 2547 if (tp1 == NULL) { 2548 SCTP_STAT_INCR(sctps_pdrptsnnf); 2549 } 2550 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 2551 uint8_t *ddp; 2552 2553 if ((stcb->asoc.peers_rwnd == 0) && 2554 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 2555 SCTP_STAT_INCR(sctps_pdrpdiwnp); 2556 return (0); 2557 } 2558 if (stcb->asoc.peers_rwnd == 0 && 2559 (flg & SCTP_FROM_MIDDLE_BOX)) { 2560 SCTP_STAT_INCR(sctps_pdrpdizrw); 2561 return (0); 2562 } 2563 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 2564 sizeof(struct sctp_data_chunk)); 2565 { 2566 unsigned int iii; 2567 2568 for (iii = 0; iii < sizeof(desc->data_bytes); 2569 iii++) { 2570 if (ddp[iii] != desc->data_bytes[iii]) { 2571 SCTP_STAT_INCR(sctps_pdrpbadd); 2572 return (-1); 2573 } 2574 } 2575 } 2576 /* 2577 * We zero out the nonce so resync not 2578 * needed 2579 */ 2580 tp1->rec.data.ect_nonce = 0; 2581 2582 if (tp1->do_rtt) { 2583 /* 2584 * this guy had a RTO calculation 2585 * pending on it, cancel it 2586 */ 2587 tp1->do_rtt = 0; 2588 } 2589 SCTP_STAT_INCR(sctps_pdrpmark); 2590 if (tp1->sent != SCTP_DATAGRAM_RESEND) 2591 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2592 tp1->sent = SCTP_DATAGRAM_RESEND; 2593 /* 2594 * mark it as if we were doing a FR, since 2595 * we will be getting gap ack reports behind 2596 * the info from the router. 2597 */ 2598 tp1->rec.data.doing_fast_retransmit = 1; 2599 /* 2600 * mark the tsn with what sequences can 2601 * cause a new FR. 2602 */ 2603 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 2604 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 2605 } else { 2606 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 2607 } 2608 2609 /* restart the timer */ 2610 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2611 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 2612 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 2613 stcb, tp1->whoTo); 2614 2615 /* fix counts and things */ 2616 if (sctp_logging_level & SCTP_FLIGHT_LOGGING_ENABLE) { 2617 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 2618 tp1->whoTo->flight_size, 2619 tp1->book_size, 2620 (uintptr_t) stcb, 2621 tp1->rec.data.TSN_seq); 2622 } 2623 sctp_flight_size_decrease(tp1); 2624 sctp_total_flight_decrease(stcb, tp1); 2625 } { 2626 /* audit code */ 2627 unsigned int audit; 2628 2629 audit = 0; 2630 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 2631 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2632 audit++; 2633 } 2634 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 2635 sctp_next) { 2636 if (tp1->sent == SCTP_DATAGRAM_RESEND) 2637 audit++; 2638 } 2639 if (audit != stcb->asoc.sent_queue_retran_cnt) { 2640 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 2641 audit, stcb->asoc.sent_queue_retran_cnt); 2642#ifndef SCTP_AUDITING_ENABLED 2643 stcb->asoc.sent_queue_retran_cnt = audit; 2644#endif 2645 } 2646 } 2647 } 2648 break; 2649 case SCTP_ASCONF: 2650 { 2651 struct sctp_tmit_chunk *asconf; 2652 2653 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 2654 sctp_next) { 2655 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 2656 break; 2657 } 2658 } 2659 if (asconf) { 2660 if (asconf->sent != SCTP_DATAGRAM_RESEND) 2661 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2662 asconf->sent = SCTP_DATAGRAM_RESEND; 2663 asconf->snd_count--; 2664 } 2665 } 2666 break; 2667 case SCTP_INITIATION: 2668 /* resend the INIT */ 2669 stcb->asoc.dropped_special_cnt++; 2670 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 2671 /* 2672 * If we can get it in, in a few attempts we do 2673 * this, otherwise we let the timer fire. 2674 */ 2675 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 2676 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 2677 sctp_send_initiate(stcb->sctp_ep, stcb); 2678 } 2679 break; 2680 case SCTP_SELECTIVE_ACK: 2681 /* resend the sack */ 2682 sctp_send_sack(stcb); 2683 break; 2684 case SCTP_HEARTBEAT_REQUEST: 2685 /* resend a demand HB */ 2686 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 2687 /* 2688 * Only retransmit if we KNOW we wont destroy the 2689 * tcb 2690 */ 2691 (void)sctp_send_hb(stcb, 1, net); 2692 } 2693 break; 2694 case SCTP_SHUTDOWN: 2695 sctp_send_shutdown(stcb, net); 2696 break; 2697 case SCTP_SHUTDOWN_ACK: 2698 sctp_send_shutdown_ack(stcb, net); 2699 break; 2700 case SCTP_COOKIE_ECHO: 2701 { 2702 struct sctp_tmit_chunk *cookie; 2703 2704 cookie = NULL; 2705 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 2706 sctp_next) { 2707 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 2708 break; 2709 } 2710 } 2711 if (cookie) { 2712 if (cookie->sent != SCTP_DATAGRAM_RESEND) 2713 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 2714 cookie->sent = SCTP_DATAGRAM_RESEND; 2715 sctp_stop_all_cookie_timers(stcb); 2716 } 2717 } 2718 break; 2719 case SCTP_COOKIE_ACK: 2720 sctp_send_cookie_ack(stcb); 2721 break; 2722 case SCTP_ASCONF_ACK: 2723 /* resend last asconf ack */ 2724 sctp_send_asconf_ack(stcb, 1); 2725 break; 2726 case SCTP_FORWARD_CUM_TSN: 2727 send_forward_tsn(stcb, &stcb->asoc); 2728 break; 2729 /* can't do anything with these */ 2730 case SCTP_PACKET_DROPPED: 2731 case SCTP_INITIATION_ACK: /* this should not happen */ 2732 case SCTP_HEARTBEAT_ACK: 2733 case SCTP_ABORT_ASSOCIATION: 2734 case SCTP_OPERATION_ERROR: 2735 case SCTP_SHUTDOWN_COMPLETE: 2736 case SCTP_ECN_ECHO: 2737 case SCTP_ECN_CWR: 2738 default: 2739 break; 2740 } 2741 return (0); 2742} 2743 2744void 2745sctp_reset_in_stream(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2746{ 2747 int i; 2748 uint16_t temp; 2749 2750 /* 2751 * We set things to 0xffff since this is the last delivered sequence 2752 * and we will be sending in 0 after the reset. 2753 */ 2754 2755 if (number_entries) { 2756 for (i = 0; i < number_entries; i++) { 2757 temp = ntohs(list[i]); 2758 if (temp >= stcb->asoc.streamincnt) { 2759 continue; 2760 } 2761 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 2762 } 2763 } else { 2764 list = NULL; 2765 for (i = 0; i < stcb->asoc.streamincnt; i++) { 2766 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 2767 } 2768 } 2769 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list); 2770} 2771 2772static void 2773sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 2774{ 2775 int i; 2776 2777 if (number_entries == 0) { 2778 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 2779 stcb->asoc.strmout[i].next_sequence_sent = 0; 2780 } 2781 } else if (number_entries) { 2782 for (i = 0; i < number_entries; i++) { 2783 uint16_t temp; 2784 2785 temp = ntohs(list[i]); 2786 if (temp >= stcb->asoc.streamoutcnt) { 2787 /* no such stream */ 2788 continue; 2789 } 2790 stcb->asoc.strmout[temp].next_sequence_sent = 0; 2791 } 2792 } 2793 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list); 2794} 2795 2796 2797struct sctp_stream_reset_out_request * 2798sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 2799{ 2800 struct sctp_association *asoc; 2801 struct sctp_stream_reset_out_req *req; 2802 struct sctp_stream_reset_out_request *r; 2803 struct sctp_tmit_chunk *chk; 2804 int len, clen; 2805 2806 asoc = &stcb->asoc; 2807 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 2808 asoc->stream_reset_outstanding = 0; 2809 return (NULL); 2810 } 2811 if (stcb->asoc.str_reset == NULL) { 2812 asoc->stream_reset_outstanding = 0; 2813 return (NULL); 2814 } 2815 chk = stcb->asoc.str_reset; 2816 if (chk->data == NULL) { 2817 return (NULL); 2818 } 2819 if (bchk) { 2820 /* he wants a copy of the chk pointer */ 2821 *bchk = chk; 2822 } 2823 clen = chk->send_size; 2824 req = mtod(chk->data, struct sctp_stream_reset_out_req *); 2825 r = &req->sr_req; 2826 if (ntohl(r->request_seq) == seq) { 2827 /* found it */ 2828 return (r); 2829 } 2830 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 2831 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 2832 /* move to the next one, there can only be a max of two */ 2833 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 2834 if (ntohl(r->request_seq) == seq) { 2835 return (r); 2836 } 2837 } 2838 /* that seq is not here */ 2839 return (NULL); 2840} 2841 2842static void 2843sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 2844{ 2845 struct sctp_association *asoc; 2846 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 2847 2848 if (stcb->asoc.str_reset == NULL) { 2849 return; 2850 } 2851 asoc = &stcb->asoc; 2852 2853 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 2854 TAILQ_REMOVE(&asoc->control_send_queue, 2855 chk, 2856 sctp_next); 2857 if (chk->data) { 2858 sctp_m_freem(chk->data); 2859 chk->data = NULL; 2860 } 2861 asoc->ctrl_queue_cnt--; 2862 sctp_free_a_chunk(stcb, chk); 2863 stcb->asoc.str_reset = NULL; 2864} 2865 2866 2867static int 2868sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 2869 uint32_t seq, uint32_t action, 2870 struct sctp_stream_reset_response *respin) 2871{ 2872 uint16_t type; 2873 int lparm_len; 2874 struct sctp_association *asoc = &stcb->asoc; 2875 struct sctp_tmit_chunk *chk; 2876 struct sctp_stream_reset_out_request *srparam; 2877 int number_entries; 2878 2879 if (asoc->stream_reset_outstanding == 0) { 2880 /* duplicate */ 2881 return (0); 2882 } 2883 if (seq == stcb->asoc.str_reset_seq_out) { 2884 srparam = sctp_find_stream_reset(stcb, seq, &chk); 2885 if (srparam) { 2886 stcb->asoc.str_reset_seq_out++; 2887 type = ntohs(srparam->ph.param_type); 2888 lparm_len = ntohs(srparam->ph.param_length); 2889 if (type == SCTP_STR_RESET_OUT_REQUEST) { 2890 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 2891 asoc->stream_reset_out_is_outstanding = 0; 2892 if (asoc->stream_reset_outstanding) 2893 asoc->stream_reset_outstanding--; 2894 if (action == SCTP_STREAM_RESET_PERFORMED) { 2895 /* do it */ 2896 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 2897 } else { 2898 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams); 2899 } 2900 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 2901 /* Answered my request */ 2902 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 2903 if (asoc->stream_reset_outstanding) 2904 asoc->stream_reset_outstanding--; 2905 if (action != SCTP_STREAM_RESET_PERFORMED) { 2906 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, number_entries, srparam->list_of_streams); 2907 } 2908 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 2909 /** 2910 * a) Adopt the new in tsn. 2911 * b) reset the map 2912 * c) Adopt the new out-tsn 2913 */ 2914 struct sctp_stream_reset_response_tsn *resp; 2915 struct sctp_forward_tsn_chunk fwdtsn; 2916 int abort_flag = 0; 2917 2918 if (respin == NULL) { 2919 /* huh ? */ 2920 return (0); 2921 } 2922 if (action == SCTP_STREAM_RESET_PERFORMED) { 2923 resp = (struct sctp_stream_reset_response_tsn *)respin; 2924 asoc->stream_reset_outstanding--; 2925 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 2926 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 2927 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 2928 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 2929 if (abort_flag) { 2930 return (1); 2931 } 2932 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 2933 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 2934 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 2935 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 2936 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 2937 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 2938 2939 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 2940 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 2941 2942 } 2943 } 2944 /* get rid of the request and get the request flags */ 2945 if (asoc->stream_reset_outstanding == 0) { 2946 sctp_clean_up_stream_reset(stcb); 2947 } 2948 } 2949 } 2950 return (0); 2951} 2952 2953static void 2954sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 2955 struct sctp_tmit_chunk *chk, 2956 struct sctp_stream_reset_in_request *req, int trunc) 2957{ 2958 uint32_t seq; 2959 int len, i; 2960 int number_entries; 2961 uint16_t temp; 2962 2963 /* 2964 * peer wants me to send a str-reset to him for my outgoing seq's if 2965 * seq_in is right. 2966 */ 2967 struct sctp_association *asoc = &stcb->asoc; 2968 2969 seq = ntohl(req->request_seq); 2970 if (asoc->str_reset_seq_in == seq) { 2971 if (trunc) { 2972 /* Can't do it, since they exceeded our buffer size */ 2973 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2974 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 2975 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2976 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 2977 len = ntohs(req->ph.param_length); 2978 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 2979 for (i = 0; i < number_entries; i++) { 2980 temp = ntohs(req->list_of_streams[i]); 2981 req->list_of_streams[i] = temp; 2982 } 2983 /* move the reset action back one */ 2984 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2985 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 2986 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 2987 asoc->str_reset_seq_out, 2988 seq, (asoc->sending_seq - 1)); 2989 asoc->stream_reset_out_is_outstanding = 1; 2990 asoc->str_reset = chk; 2991 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 2992 stcb->asoc.stream_reset_outstanding++; 2993 } else { 2994 /* Can't do it, since we have sent one out */ 2995 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 2996 asoc->last_reset_action[0] = SCTP_STREAM_RESET_TRY_LATER; 2997 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 2998 } 2999 asoc->str_reset_seq_in++; 3000 } else if (asoc->str_reset_seq_in - 1 == seq) { 3001 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3002 } else if (asoc->str_reset_seq_in - 2 == seq) { 3003 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3004 } else { 3005 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3006 } 3007} 3008 3009static int 3010sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3011 struct sctp_tmit_chunk *chk, 3012 struct sctp_stream_reset_tsn_request *req) 3013{ 3014 /* reset all in and out and update the tsn */ 3015 /* 3016 * A) reset my str-seq's on in and out. B) Select a receive next, 3017 * and set cum-ack to it. Also process this selected number as a 3018 * fwd-tsn as well. C) set in the response my next sending seq. 3019 */ 3020 struct sctp_forward_tsn_chunk fwdtsn; 3021 struct sctp_association *asoc = &stcb->asoc; 3022 int abort_flag = 0; 3023 uint32_t seq; 3024 3025 seq = ntohl(req->request_seq); 3026 if (asoc->str_reset_seq_in == seq) { 3027 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3028 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3029 fwdtsn.ch.chunk_flags = 0; 3030 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3031 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3032 if (abort_flag) { 3033 return (1); 3034 } 3035 stcb->asoc.highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3036 stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3037 stcb->asoc.mapping_array_base_tsn = stcb->asoc.highest_tsn_inside_map + 1; 3038 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3039 atomic_add_int(&stcb->asoc.sending_seq, 1); 3040 /* save off historical data for retrans */ 3041 stcb->asoc.last_sending_seq[1] = stcb->asoc.last_sending_seq[0]; 3042 stcb->asoc.last_sending_seq[0] = stcb->asoc.sending_seq; 3043 stcb->asoc.last_base_tsnsent[1] = stcb->asoc.last_base_tsnsent[0]; 3044 stcb->asoc.last_base_tsnsent[0] = stcb->asoc.mapping_array_base_tsn; 3045 3046 sctp_add_stream_reset_result_tsn(chk, 3047 ntohl(req->request_seq), 3048 SCTP_STREAM_RESET_PERFORMED, 3049 stcb->asoc.sending_seq, 3050 stcb->asoc.mapping_array_base_tsn); 3051 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3052 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3053 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3054 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3055 3056 asoc->str_reset_seq_in++; 3057 } else if (asoc->str_reset_seq_in - 1 == seq) { 3058 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3059 stcb->asoc.last_sending_seq[0], 3060 stcb->asoc.last_base_tsnsent[0] 3061 ); 3062 } else if (asoc->str_reset_seq_in - 2 == seq) { 3063 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3064 stcb->asoc.last_sending_seq[1], 3065 stcb->asoc.last_base_tsnsent[1] 3066 ); 3067 } else { 3068 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3069 } 3070 return (0); 3071} 3072 3073static void 3074sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3075 struct sctp_tmit_chunk *chk, 3076 struct sctp_stream_reset_out_request *req, int trunc) 3077{ 3078 uint32_t seq, tsn; 3079 int number_entries, len; 3080 struct sctp_association *asoc = &stcb->asoc; 3081 3082 seq = ntohl(req->request_seq); 3083 3084 /* now if its not a duplicate we process it */ 3085 if (asoc->str_reset_seq_in == seq) { 3086 len = ntohs(req->ph.param_length); 3087 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3088 /* 3089 * the sender is resetting, handle the list issue.. we must 3090 * a) verify if we can do the reset, if so no problem b) If 3091 * we can't do the reset we must copy the request. c) queue 3092 * it, and setup the data in processor to trigger it off 3093 * when needed and dequeue all the queued data. 3094 */ 3095 tsn = ntohl(req->send_reset_at_tsn); 3096 3097 /* move the reset action back one */ 3098 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3099 if (trunc) { 3100 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3101 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3102 } else if ((tsn == asoc->cumulative_tsn) || 3103 (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN))) { 3104 /* we can do it now */ 3105 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3106 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3107 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3108 } else { 3109 /* 3110 * we must queue it up and thus wait for the TSN's 3111 * to arrive that are at or before tsn 3112 */ 3113 struct sctp_stream_reset_list *liste; 3114 int siz; 3115 3116 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3117 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3118 siz, SCTP_M_STRESET); 3119 if (liste == NULL) { 3120 /* gak out of memory */ 3121 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_DENIED); 3122 asoc->last_reset_action[0] = SCTP_STREAM_RESET_DENIED; 3123 return; 3124 } 3125 liste->tsn = tsn; 3126 liste->number_entries = number_entries; 3127 memcpy(&liste->req, req, 3128 (sizeof(struct sctp_stream_reset_out_request) + (number_entries * sizeof(uint16_t)))); 3129 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3130 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_PERFORMED); 3131 asoc->last_reset_action[0] = SCTP_STREAM_RESET_PERFORMED; 3132 } 3133 asoc->str_reset_seq_in++; 3134 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3135 /* 3136 * one seq back, just echo back last action since my 3137 * response was lost. 3138 */ 3139 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3140 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3141 /* 3142 * two seq back, just echo back last action since my 3143 * response was lost. 3144 */ 3145 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3146 } else { 3147 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_BAD_SEQNO); 3148 } 3149} 3150 3151#ifdef __GNUC__ 3152__attribute__((noinline)) 3153#endif 3154 static int 3155 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3156 struct sctp_stream_reset_out_req *sr_req) 3157{ 3158 int chk_length, param_len, ptype; 3159 struct sctp_paramhdr pstore; 3160 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3161 3162 uint32_t seq; 3163 int num_req = 0; 3164 int trunc = 0; 3165 struct sctp_tmit_chunk *chk; 3166 struct sctp_chunkhdr *ch; 3167 struct sctp_paramhdr *ph; 3168 int ret_code = 0; 3169 int num_param = 0; 3170 3171 /* now it may be a reset or a reset-response */ 3172 chk_length = ntohs(sr_req->ch.chunk_length); 3173 3174 /* setup for adding the response */ 3175 sctp_alloc_a_chunk(stcb, chk); 3176 if (chk == NULL) { 3177 return (ret_code); 3178 } 3179 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3180 chk->rec.chunk_id.can_take_data = 0; 3181 chk->asoc = &stcb->asoc; 3182 chk->no_fr_allowed = 0; 3183 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3184 chk->book_size_scale = 0; 3185 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 3186 if (chk->data == NULL) { 3187strres_nochunk: 3188 if (chk->data) { 3189 sctp_m_freem(chk->data); 3190 chk->data = NULL; 3191 } 3192 sctp_free_a_chunk(stcb, chk); 3193 return (ret_code); 3194 } 3195 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3196 3197 /* setup chunk parameters */ 3198 chk->sent = SCTP_DATAGRAM_UNSENT; 3199 chk->snd_count = 0; 3200 chk->whoTo = stcb->asoc.primary_destination; 3201 atomic_add_int(&chk->whoTo->ref_count, 1); 3202 3203 ch = mtod(chk->data, struct sctp_chunkhdr *); 3204 ch->chunk_type = SCTP_STREAM_RESET; 3205 ch->chunk_flags = 0; 3206 ch->chunk_length = htons(chk->send_size); 3207 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3208 offset += sizeof(struct sctp_chunkhdr); 3209 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 3210 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 3211 if (ph == NULL) 3212 break; 3213 param_len = ntohs(ph->param_length); 3214 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 3215 /* bad param */ 3216 break; 3217 } 3218 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 3219 (uint8_t *) & cstore); 3220 ptype = ntohs(ph->param_type); 3221 num_param++; 3222 if (param_len > (int)sizeof(cstore)) { 3223 trunc = 1; 3224 } else { 3225 trunc = 0; 3226 } 3227 3228 if (num_param > SCTP_MAX_RESET_PARAMS) { 3229 /* hit the max of parameters already sorry.. */ 3230 break; 3231 } 3232 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 3233 struct sctp_stream_reset_out_request *req_out; 3234 3235 req_out = (struct sctp_stream_reset_out_request *)ph; 3236 num_req++; 3237 if (stcb->asoc.stream_reset_outstanding) { 3238 seq = ntohl(req_out->response_seq); 3239 if (seq == stcb->asoc.str_reset_seq_out) { 3240 /* implicit ack */ 3241 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_PERFORMED, NULL); 3242 } 3243 } 3244 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 3245 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 3246 struct sctp_stream_reset_in_request *req_in; 3247 3248 num_req++; 3249 3250 req_in = (struct sctp_stream_reset_in_request *)ph; 3251 3252 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 3253 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 3254 struct sctp_stream_reset_tsn_request *req_tsn; 3255 3256 num_req++; 3257 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 3258 3259 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 3260 ret_code = 1; 3261 goto strres_nochunk; 3262 } 3263 /* no more */ 3264 break; 3265 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 3266 struct sctp_stream_reset_response *resp; 3267 uint32_t result; 3268 3269 resp = (struct sctp_stream_reset_response *)ph; 3270 seq = ntohl(resp->response_seq); 3271 result = ntohl(resp->result); 3272 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 3273 ret_code = 1; 3274 goto strres_nochunk; 3275 } 3276 } else { 3277 break; 3278 } 3279 offset += SCTP_SIZE32(param_len); 3280 chk_length -= SCTP_SIZE32(param_len); 3281 } 3282 if (num_req == 0) { 3283 /* we have no response free the stuff */ 3284 goto strres_nochunk; 3285 } 3286 /* ok we have a chunk to link in */ 3287 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 3288 chk, 3289 sctp_next); 3290 stcb->asoc.ctrl_queue_cnt++; 3291 return (ret_code); 3292} 3293 3294/* 3295 * Handle a router or endpoints report of a packet loss, there are two ways 3296 * to handle this, either we get the whole packet and must disect it 3297 * ourselves (possibly with truncation and or corruption) or it is a summary 3298 * from a middle box that did the disectting for us. 3299 */ 3300static void 3301sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 3302 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 3303{ 3304 uint32_t bottle_bw, on_queue; 3305 uint16_t trunc_len; 3306 unsigned int chlen; 3307 unsigned int at; 3308 struct sctp_chunk_desc desc; 3309 struct sctp_chunkhdr *ch; 3310 3311 chlen = ntohs(cp->ch.chunk_length); 3312 chlen -= sizeof(struct sctp_pktdrop_chunk); 3313 /* XXX possible chlen underflow */ 3314 if (chlen == 0) { 3315 ch = NULL; 3316 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 3317 SCTP_STAT_INCR(sctps_pdrpbwrpt); 3318 } else { 3319 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 3320 chlen -= sizeof(struct sctphdr); 3321 /* XXX possible chlen underflow */ 3322 memset(&desc, 0, sizeof(desc)); 3323 } 3324 trunc_len = (uint16_t) ntohs(cp->trunc_len); 3325 if (trunc_len > limit) { 3326 trunc_len = limit; 3327 } 3328 /* now the chunks themselves */ 3329 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 3330 desc.chunk_type = ch->chunk_type; 3331 /* get amount we need to move */ 3332 at = ntohs(ch->chunk_length); 3333 if (at < sizeof(struct sctp_chunkhdr)) { 3334 /* corrupt chunk, maybe at the end? */ 3335 SCTP_STAT_INCR(sctps_pdrpcrupt); 3336 break; 3337 } 3338 if (trunc_len == 0) { 3339 /* we are supposed to have all of it */ 3340 if (at > chlen) { 3341 /* corrupt skip it */ 3342 SCTP_STAT_INCR(sctps_pdrpcrupt); 3343 break; 3344 } 3345 } else { 3346 /* is there enough of it left ? */ 3347 if (desc.chunk_type == SCTP_DATA) { 3348 if (chlen < (sizeof(struct sctp_data_chunk) + 3349 sizeof(desc.data_bytes))) { 3350 break; 3351 } 3352 } else { 3353 if (chlen < sizeof(struct sctp_chunkhdr)) { 3354 break; 3355 } 3356 } 3357 } 3358 if (desc.chunk_type == SCTP_DATA) { 3359 /* can we get out the tsn? */ 3360 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3361 SCTP_STAT_INCR(sctps_pdrpmbda); 3362 3363 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 3364 /* yep */ 3365 struct sctp_data_chunk *dcp; 3366 uint8_t *ddp; 3367 unsigned int iii; 3368 3369 dcp = (struct sctp_data_chunk *)ch; 3370 ddp = (uint8_t *) (dcp + 1); 3371 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 3372 desc.data_bytes[iii] = ddp[iii]; 3373 } 3374 desc.tsn_ifany = dcp->dp.tsn; 3375 } else { 3376 /* nope we are done. */ 3377 SCTP_STAT_INCR(sctps_pdrpnedat); 3378 break; 3379 } 3380 } else { 3381 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 3382 SCTP_STAT_INCR(sctps_pdrpmbct); 3383 } 3384 3385 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 3386 SCTP_STAT_INCR(sctps_pdrppdbrk); 3387 break; 3388 } 3389 if (SCTP_SIZE32(at) > chlen) { 3390 break; 3391 } 3392 chlen -= SCTP_SIZE32(at); 3393 if (chlen < sizeof(struct sctp_chunkhdr)) { 3394 /* done, none left */ 3395 break; 3396 } 3397 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 3398 } 3399 /* Now update any rwnd --- possibly */ 3400 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 3401 /* From a peer, we get a rwnd report */ 3402 uint32_t a_rwnd; 3403 3404 SCTP_STAT_INCR(sctps_pdrpfehos); 3405 3406 bottle_bw = ntohl(cp->bottle_bw); 3407 on_queue = ntohl(cp->current_onq); 3408 if (bottle_bw && on_queue) { 3409 /* a rwnd report is in here */ 3410 if (bottle_bw > on_queue) 3411 a_rwnd = bottle_bw - on_queue; 3412 else 3413 a_rwnd = 0; 3414 3415 if (a_rwnd == 0) 3416 stcb->asoc.peers_rwnd = 0; 3417 else { 3418 if (a_rwnd > stcb->asoc.total_flight) { 3419 stcb->asoc.peers_rwnd = 3420 a_rwnd - stcb->asoc.total_flight; 3421 } else { 3422 stcb->asoc.peers_rwnd = 0; 3423 } 3424 if (stcb->asoc.peers_rwnd < 3425 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 3426 /* SWS sender side engages */ 3427 stcb->asoc.peers_rwnd = 0; 3428 } 3429 } 3430 } 3431 } else { 3432 SCTP_STAT_INCR(sctps_pdrpfmbox); 3433 } 3434 3435 /* now middle boxes in sat networks get a cwnd bump */ 3436 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 3437 (stcb->asoc.sat_t3_loss_recovery == 0) && 3438 (stcb->asoc.sat_network)) { 3439 /* 3440 * This is debateable but for sat networks it makes sense 3441 * Note if a T3 timer has went off, we will prohibit any 3442 * changes to cwnd until we exit the t3 loss recovery. 3443 */ 3444 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 3445 net, cp, &bottle_bw, &on_queue); 3446 } 3447} 3448 3449/* 3450 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 3451 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 3452 * offset: offset into the mbuf chain to first chunkhdr - length: is the 3453 * length of the complete packet outputs: - length: modified to remaining 3454 * length after control processing - netp: modified to new sctp_nets after 3455 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 3456 * bad packet,...) otherwise return the tcb for this packet 3457 */ 3458#ifdef __GNUC__ 3459__attribute__((noinline)) 3460#endif 3461 static struct sctp_tcb * 3462 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 3463 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 3464 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 3465 uint32_t vrf_id) 3466{ 3467 struct sctp_association *asoc; 3468 uint32_t vtag_in; 3469 int num_chunks = 0; /* number of control chunks processed */ 3470 uint32_t chk_length; 3471 int ret; 3472 int abort_no_unlock = 0; 3473 3474 /* 3475 * How big should this be, and should it be alloc'd? Lets try the 3476 * d-mtu-ceiling for now (2k) and that should hopefully work ... 3477 * until we get into jumbo grams and such.. 3478 */ 3479 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 3480 struct sctp_tcb *locked_tcb = stcb; 3481 int got_auth = 0; 3482 uint32_t auth_offset = 0, auth_len = 0; 3483 int auth_skipped = 0; 3484 3485 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 3486 iphlen, *offset, length, stcb); 3487 3488 /* validate chunk header length... */ 3489 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 3490 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 3491 ntohs(ch->chunk_length)); 3492 if (locked_tcb) { 3493 SCTP_TCB_UNLOCK(locked_tcb); 3494 } 3495 return (NULL); 3496 } 3497 /* 3498 * validate the verification tag 3499 */ 3500 vtag_in = ntohl(sh->v_tag); 3501 3502 if (locked_tcb) { 3503 SCTP_TCB_LOCK_ASSERT(locked_tcb); 3504 } 3505 if (ch->chunk_type == SCTP_INITIATION) { 3506 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 3507 ntohs(ch->chunk_length), vtag_in); 3508 if (vtag_in != 0) { 3509 /* protocol error- silently discard... */ 3510 SCTP_STAT_INCR(sctps_badvtag); 3511 if (locked_tcb) { 3512 SCTP_TCB_UNLOCK(locked_tcb); 3513 } 3514 return (NULL); 3515 } 3516 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 3517 /* 3518 * If there is no stcb, skip the AUTH chunk and process 3519 * later after a stcb is found (to validate the lookup was 3520 * valid. 3521 */ 3522 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 3523 (stcb == NULL) && !sctp_auth_disable) { 3524 /* save this chunk for later processing */ 3525 auth_skipped = 1; 3526 auth_offset = *offset; 3527 auth_len = ntohs(ch->chunk_length); 3528 3529 /* (temporarily) move past this chunk */ 3530 *offset += SCTP_SIZE32(auth_len); 3531 if (*offset >= length) { 3532 /* no more data left in the mbuf chain */ 3533 *offset = length; 3534 if (locked_tcb) { 3535 SCTP_TCB_UNLOCK(locked_tcb); 3536 } 3537 return (NULL); 3538 } 3539 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3540 sizeof(struct sctp_chunkhdr), chunk_buf); 3541 } 3542 if (ch == NULL) { 3543 /* Help */ 3544 *offset = length; 3545 if (locked_tcb) { 3546 SCTP_TCB_UNLOCK(locked_tcb); 3547 } 3548 return (NULL); 3549 } 3550 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 3551 goto process_control_chunks; 3552 } 3553 /* 3554 * first check if it's an ASCONF with an unknown src addr we 3555 * need to look inside to find the association 3556 */ 3557 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 3558 /* inp's refcount may be reduced */ 3559 SCTP_INP_INCR_REF(inp); 3560 3561 stcb = sctp_findassociation_ep_asconf(m, iphlen, 3562 *offset, sh, &inp, netp); 3563 if (stcb == NULL) { 3564 /* 3565 * reduce inp's refcount if not reduced in 3566 * sctp_findassociation_ep_asconf(). 3567 */ 3568 SCTP_INP_DECR_REF(inp); 3569 } 3570 /* now go back and verify any auth chunk to be sure */ 3571 if (auth_skipped && (stcb != NULL)) { 3572 struct sctp_auth_chunk *auth; 3573 3574 auth = (struct sctp_auth_chunk *) 3575 sctp_m_getptr(m, auth_offset, 3576 auth_len, chunk_buf); 3577 got_auth = 1; 3578 auth_skipped = 0; 3579 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 3580 auth_offset)) { 3581 /* auth HMAC failed so dump it */ 3582 *offset = length; 3583 if (locked_tcb) { 3584 SCTP_TCB_UNLOCK(locked_tcb); 3585 } 3586 return (NULL); 3587 } else { 3588 /* remaining chunks are HMAC checked */ 3589 stcb->asoc.authenticated = 1; 3590 } 3591 } 3592 } 3593 if (stcb == NULL) { 3594 /* no association, so it's out of the blue... */ 3595 sctp_handle_ootb(m, iphlen, *offset, sh, inp, NULL, 3596 vrf_id); 3597 *offset = length; 3598 if (locked_tcb) { 3599 SCTP_TCB_UNLOCK(locked_tcb); 3600 } 3601 return (NULL); 3602 } 3603 asoc = &stcb->asoc; 3604 /* ABORT and SHUTDOWN can use either v_tag... */ 3605 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 3606 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 3607 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 3608 if ((vtag_in == asoc->my_vtag) || 3609 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 3610 (vtag_in == asoc->peer_vtag))) { 3611 /* this is valid */ 3612 } else { 3613 /* drop this packet... */ 3614 SCTP_STAT_INCR(sctps_badvtag); 3615 if (locked_tcb) { 3616 SCTP_TCB_UNLOCK(locked_tcb); 3617 } 3618 return (NULL); 3619 } 3620 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 3621 if (vtag_in != asoc->my_vtag) { 3622 /* 3623 * this could be a stale SHUTDOWN-ACK or the 3624 * peer never got the SHUTDOWN-COMPLETE and 3625 * is still hung; we have started a new asoc 3626 * but it won't complete until the shutdown 3627 * is completed 3628 */ 3629 if (locked_tcb) { 3630 SCTP_TCB_UNLOCK(locked_tcb); 3631 } 3632 sctp_handle_ootb(m, iphlen, *offset, sh, inp, 3633 NULL, vrf_id); 3634 return (NULL); 3635 } 3636 } else { 3637 /* for all other chunks, vtag must match */ 3638 if (vtag_in != asoc->my_vtag) { 3639 /* invalid vtag... */ 3640 SCTPDBG(SCTP_DEBUG_INPUT3, 3641 "invalid vtag: %xh, expect %xh\n", 3642 vtag_in, asoc->my_vtag); 3643 SCTP_STAT_INCR(sctps_badvtag); 3644 if (locked_tcb) { 3645 SCTP_TCB_UNLOCK(locked_tcb); 3646 } 3647 *offset = length; 3648 return (NULL); 3649 } 3650 } 3651 } /* end if !SCTP_COOKIE_ECHO */ 3652 /* 3653 * process all control chunks... 3654 */ 3655 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 3656 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 3657 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 3658 /* implied cookie-ack.. we must have lost the ack */ 3659 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 3660 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3661 stcb->asoc.overall_error_count, 3662 0, 3663 SCTP_FROM_SCTP_INPUT, 3664 __LINE__); 3665 } 3666 stcb->asoc.overall_error_count = 0; 3667 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 3668 *netp); 3669 } 3670process_control_chunks: 3671 while (IS_SCTP_CONTROL(ch)) { 3672 /* validate chunk length */ 3673 chk_length = ntohs(ch->chunk_length); 3674 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 3675 ch->chunk_type, chk_length); 3676 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 3677 if (chk_length < sizeof(*ch) || 3678 (*offset + (int)chk_length) > length) { 3679 *offset = length; 3680 if (locked_tcb) { 3681 SCTP_TCB_UNLOCK(locked_tcb); 3682 } 3683 return (NULL); 3684 } 3685 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 3686 /* 3687 * INIT-ACK only gets the init ack "header" portion only 3688 * because we don't have to process the peer's COOKIE. All 3689 * others get a complete chunk. 3690 */ 3691 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 3692 (ch->chunk_type == SCTP_INITIATION)) { 3693 /* get an init-ack chunk */ 3694 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3695 sizeof(struct sctp_init_ack_chunk), chunk_buf); 3696 if (ch == NULL) { 3697 *offset = length; 3698 if (locked_tcb) { 3699 SCTP_TCB_UNLOCK(locked_tcb); 3700 } 3701 return (NULL); 3702 } 3703 } else { 3704 /* For cookies and all other chunks. */ 3705 if (chk_length > sizeof(chunk_buf)) { 3706 /* 3707 * use just the size of the chunk buffer so 3708 * the front part of our chunks fit in 3709 * contiguous space up to the chunk buffer 3710 * size (508 bytes). For chunks that need to 3711 * get more than that they must use the 3712 * sctp_m_getptr() function or other means 3713 * (e.g. know how to parse mbuf chains). 3714 * Cookies do this already. 3715 */ 3716 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3717 (sizeof(chunk_buf) - 4), 3718 chunk_buf); 3719 if (ch == NULL) { 3720 *offset = length; 3721 if (locked_tcb) { 3722 SCTP_TCB_UNLOCK(locked_tcb); 3723 } 3724 return (NULL); 3725 } 3726 } else { 3727 /* We can fit it all */ 3728 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 3729 chk_length, chunk_buf); 3730 if (ch == NULL) { 3731 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 3732 *offset = length; 3733 if (locked_tcb) { 3734 SCTP_TCB_UNLOCK(locked_tcb); 3735 } 3736 return (NULL); 3737 } 3738 } 3739 } 3740 num_chunks++; 3741 /* Save off the last place we got a control from */ 3742 if (stcb != NULL) { 3743 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 3744 /* 3745 * allow last_control to be NULL if 3746 * ASCONF... ASCONF processing will find the 3747 * right net later 3748 */ 3749 if ((netp != NULL) && (*netp != NULL)) 3750 stcb->asoc.last_control_chunk_from = *netp; 3751 } 3752 } 3753#ifdef SCTP_AUDITING_ENABLED 3754 sctp_audit_log(0xB0, ch->chunk_type); 3755#endif 3756 3757 /* check to see if this chunk required auth, but isn't */ 3758 if ((stcb != NULL) && !sctp_auth_disable && 3759 sctp_auth_is_required_chunk(ch->chunk_type, 3760 stcb->asoc.local_auth_chunks) && 3761 !stcb->asoc.authenticated) { 3762 /* "silently" ignore */ 3763 SCTP_STAT_INCR(sctps_recvauthmissing); 3764 goto next_chunk; 3765 } 3766 switch (ch->chunk_type) { 3767 case SCTP_INITIATION: 3768 /* must be first and only chunk */ 3769 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 3770 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3771 /* We are not interested anymore? */ 3772 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3773 /* 3774 * collision case where we are 3775 * sending to them too 3776 */ 3777 ; 3778 } else { 3779 if (locked_tcb) { 3780 SCTP_TCB_UNLOCK(locked_tcb); 3781 } 3782 *offset = length; 3783 return (NULL); 3784 } 3785 } 3786 if ((num_chunks > 1) || 3787 (sctp_strict_init && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 3788 *offset = length; 3789 if (locked_tcb) { 3790 SCTP_TCB_UNLOCK(locked_tcb); 3791 } 3792 return (NULL); 3793 } 3794 if ((stcb != NULL) && 3795 (SCTP_GET_STATE(&stcb->asoc) == 3796 SCTP_STATE_SHUTDOWN_ACK_SENT)) { 3797 sctp_send_shutdown_ack(stcb, 3798 stcb->asoc.primary_destination); 3799 *offset = length; 3800 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3801 if (locked_tcb) { 3802 SCTP_TCB_UNLOCK(locked_tcb); 3803 } 3804 return (NULL); 3805 } 3806 if (netp) { 3807 sctp_handle_init(m, iphlen, *offset, sh, 3808 (struct sctp_init_chunk *)ch, inp, 3809 stcb, *netp, &abort_no_unlock, vrf_id); 3810 } 3811 if (abort_no_unlock) 3812 return (NULL); 3813 3814 *offset = length; 3815 if (locked_tcb) { 3816 SCTP_TCB_UNLOCK(locked_tcb); 3817 } 3818 return (NULL); 3819 break; 3820 case SCTP_PAD_CHUNK: 3821 break; 3822 case SCTP_INITIATION_ACK: 3823 /* must be first and only chunk */ 3824 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 3825 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 3826 /* We are not interested anymore */ 3827 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 3828 ; 3829 } else { 3830 if (locked_tcb) { 3831 SCTP_TCB_UNLOCK(locked_tcb); 3832 } 3833 *offset = length; 3834 if (stcb) { 3835 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3836 } 3837 return (NULL); 3838 } 3839 } 3840 if ((num_chunks > 1) || 3841 (sctp_strict_init && (length - *offset > (int)SCTP_SIZE32(chk_length)))) { 3842 *offset = length; 3843 if (locked_tcb) { 3844 SCTP_TCB_UNLOCK(locked_tcb); 3845 } 3846 return (NULL); 3847 } 3848 if ((netp) && (*netp)) { 3849 ret = sctp_handle_init_ack(m, iphlen, *offset, sh, 3850 (struct sctp_init_ack_chunk *)ch, stcb, *netp, &abort_no_unlock, vrf_id); 3851 } else { 3852 ret = -1; 3853 } 3854 /* 3855 * Special case, I must call the output routine to 3856 * get the cookie echoed 3857 */ 3858 if (abort_no_unlock) 3859 return (NULL); 3860 3861 if ((stcb) && ret == 0) 3862 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 3863 *offset = length; 3864 if (locked_tcb) { 3865 SCTP_TCB_UNLOCK(locked_tcb); 3866 } 3867 return (NULL); 3868 break; 3869 case SCTP_SELECTIVE_ACK: 3870 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 3871 SCTP_STAT_INCR(sctps_recvsacks); 3872 { 3873 struct sctp_sack_chunk *sack; 3874 int abort_now = 0; 3875 uint32_t a_rwnd, cum_ack; 3876 uint16_t num_seg; 3877 int nonce_sum_flag; 3878 3879 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_sack_chunk))) { 3880 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on sack chunk, too small\n"); 3881 *offset = length; 3882 if (locked_tcb) { 3883 SCTP_TCB_UNLOCK(locked_tcb); 3884 } 3885 return (NULL); 3886 } 3887 sack = (struct sctp_sack_chunk *)ch; 3888 nonce_sum_flag = ch->chunk_flags & SCTP_SACK_NONCE_SUM; 3889 cum_ack = ntohl(sack->sack.cum_tsn_ack); 3890 num_seg = ntohs(sack->sack.num_gap_ack_blks); 3891 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 3892 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 3893 cum_ack, 3894 num_seg, 3895 a_rwnd 3896 ); 3897 stcb->asoc.seen_a_sack_this_pkt = 1; 3898 if ((stcb->asoc.pr_sctp_cnt == 0) && 3899 (num_seg == 0) && 3900 ((compare_with_wrap(cum_ack, stcb->asoc.last_acked_seq, MAX_TSN)) || 3901 (cum_ack == stcb->asoc.last_acked_seq)) && 3902 (stcb->asoc.saw_sack_with_frags == 0) && 3903 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 3904 ) { 3905 /* 3906 * We have a SIMPLE sack having no 3907 * prior segments and data on sent 3908 * queue to be acked.. Use the 3909 * faster path sack processing. We 3910 * also allow window update sacks 3911 * with no missing segments to go 3912 * this way too. 3913 */ 3914 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, nonce_sum_flag, 3915 &abort_now); 3916 } else { 3917 if (netp && *netp) 3918 sctp_handle_sack(m, *offset, 3919 sack, stcb, *netp, &abort_now, chk_length, a_rwnd); 3920 } 3921 if (abort_now) { 3922 /* ABORT signal from sack processing */ 3923 *offset = length; 3924 return (NULL); 3925 } 3926 } 3927 break; 3928 case SCTP_HEARTBEAT_REQUEST: 3929 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 3930 if ((stcb) && netp && *netp) { 3931 SCTP_STAT_INCR(sctps_recvheartbeat); 3932 sctp_send_heartbeat_ack(stcb, m, *offset, 3933 chk_length, *netp); 3934 3935 /* He's alive so give him credit */ 3936 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 3937 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3938 stcb->asoc.overall_error_count, 3939 0, 3940 SCTP_FROM_SCTP_INPUT, 3941 __LINE__); 3942 } 3943 stcb->asoc.overall_error_count = 0; 3944 } 3945 break; 3946 case SCTP_HEARTBEAT_ACK: 3947 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 3948 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 3949 /* Its not ours */ 3950 *offset = length; 3951 if (locked_tcb) { 3952 SCTP_TCB_UNLOCK(locked_tcb); 3953 } 3954 return (NULL); 3955 } 3956 /* He's alive so give him credit */ 3957 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 3958 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 3959 stcb->asoc.overall_error_count, 3960 0, 3961 SCTP_FROM_SCTP_INPUT, 3962 __LINE__); 3963 } 3964 stcb->asoc.overall_error_count = 0; 3965 SCTP_STAT_INCR(sctps_recvheartbeatack); 3966 if (netp && *netp) 3967 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 3968 stcb, *netp); 3969 break; 3970 case SCTP_ABORT_ASSOCIATION: 3971 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 3972 stcb); 3973 if ((stcb) && netp && *netp) 3974 sctp_handle_abort((struct sctp_abort_chunk *)ch, 3975 stcb, *netp); 3976 *offset = length; 3977 return (NULL); 3978 break; 3979 case SCTP_SHUTDOWN: 3980 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 3981 stcb); 3982 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 3983 *offset = length; 3984 if (locked_tcb) { 3985 SCTP_TCB_UNLOCK(locked_tcb); 3986 } 3987 return (NULL); 3988 } 3989 if (netp && *netp) { 3990 int abort_flag = 0; 3991 3992 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 3993 stcb, *netp, &abort_flag); 3994 if (abort_flag) { 3995 *offset = length; 3996 return (NULL); 3997 } 3998 } 3999 break; 4000 case SCTP_SHUTDOWN_ACK: 4001 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", stcb); 4002 if ((stcb) && (netp) && (*netp)) 4003 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4004 *offset = length; 4005 return (NULL); 4006 break; 4007 4008 case SCTP_OPERATION_ERROR: 4009 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 4010 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 4011 4012 *offset = length; 4013 return (NULL); 4014 } 4015 break; 4016 case SCTP_COOKIE_ECHO: 4017 SCTPDBG(SCTP_DEBUG_INPUT3, 4018 "SCTP_COOKIE-ECHO, stcb %p\n", stcb); 4019 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4020 ; 4021 } else { 4022 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4023 /* We are not interested anymore */ 4024 *offset = length; 4025 return (NULL); 4026 } 4027 } 4028 /* 4029 * First are we accepting? We do this again here 4030 * sincen it is possible that a previous endpoint 4031 * WAS listening responded to a INIT-ACK and then 4032 * closed. We opened and bound.. and are now no 4033 * longer listening. 4034 */ 4035 if (inp->sctp_socket->so_qlimit == 0) { 4036 if ((stcb) && (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 4037 /* 4038 * special case, is this a retran'd 4039 * COOKIE-ECHO or a restarting assoc 4040 * that is a peeled off or 4041 * one-to-one style socket. 4042 */ 4043 goto process_cookie_anyway; 4044 } 4045 sctp_abort_association(inp, stcb, m, iphlen, 4046 sh, NULL, vrf_id); 4047 *offset = length; 4048 return (NULL); 4049 } else if (inp->sctp_socket->so_qlimit) { 4050 /* we are accepting so check limits like TCP */ 4051 if (inp->sctp_socket->so_qlen > 4052 inp->sctp_socket->so_qlimit) { 4053 /* no space */ 4054 struct mbuf *oper; 4055 struct sctp_paramhdr *phdr; 4056 4057 if (sctp_abort_if_one_2_one_hits_limit) { 4058 oper = NULL; 4059 oper = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4060 0, M_DONTWAIT, 1, MT_DATA); 4061 if (oper) { 4062 SCTP_BUF_LEN(oper) = 4063 sizeof(struct sctp_paramhdr); 4064 phdr = mtod(oper, 4065 struct sctp_paramhdr *); 4066 phdr->param_type = 4067 htons(SCTP_CAUSE_OUT_OF_RESC); 4068 phdr->param_length = 4069 htons(sizeof(struct sctp_paramhdr)); 4070 } 4071 sctp_abort_association(inp, stcb, m, 4072 iphlen, sh, oper, vrf_id); 4073 } 4074 *offset = length; 4075 return (NULL); 4076 } 4077 } 4078 process_cookie_anyway: 4079 { 4080 struct mbuf *ret_buf; 4081 struct sctp_inpcb *linp; 4082 4083 if (stcb) { 4084 linp = NULL; 4085 } else { 4086 linp = inp; 4087 } 4088 4089 if (linp) { 4090 SCTP_ASOC_CREATE_LOCK(linp); 4091 } 4092 if (netp) { 4093 ret_buf = 4094 sctp_handle_cookie_echo(m, iphlen, 4095 *offset, sh, 4096 (struct sctp_cookie_echo_chunk *)ch, 4097 &inp, &stcb, netp, 4098 auth_skipped, 4099 auth_offset, 4100 auth_len, 4101 &locked_tcb, 4102 vrf_id); 4103 } else { 4104 ret_buf = NULL; 4105 } 4106 if (linp) { 4107 SCTP_ASOC_CREATE_UNLOCK(linp); 4108 } 4109 if (ret_buf == NULL) { 4110 if (locked_tcb) { 4111 SCTP_TCB_UNLOCK(locked_tcb); 4112 } 4113 SCTPDBG(SCTP_DEBUG_INPUT3, 4114 "GAK, null buffer\n"); 4115 auth_skipped = 0; 4116 *offset = length; 4117 return (NULL); 4118 } 4119 /* if AUTH skipped, see if it verified... */ 4120 if (auth_skipped) { 4121 got_auth = 1; 4122 auth_skipped = 0; 4123 } 4124 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 4125 /* 4126 * Restart the timer if we have 4127 * pending data 4128 */ 4129 struct sctp_tmit_chunk *chk; 4130 4131 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 4132 if (chk) { 4133 sctp_timer_start(SCTP_TIMER_TYPE_SEND, 4134 stcb->sctp_ep, stcb, 4135 chk->whoTo); 4136 } 4137 } 4138 } 4139 break; 4140 case SCTP_COOKIE_ACK: 4141 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", stcb); 4142 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4143 if (locked_tcb) { 4144 SCTP_TCB_UNLOCK(locked_tcb); 4145 } 4146 return (NULL); 4147 } 4148 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4149 /* We are not interested anymore */ 4150 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4151 ; 4152 } else if (stcb) { 4153 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4154 *offset = length; 4155 return (NULL); 4156 } 4157 } 4158 /* He's alive so give him credit */ 4159 if ((stcb) && netp && *netp) { 4160 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4161 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4162 stcb->asoc.overall_error_count, 4163 0, 4164 SCTP_FROM_SCTP_INPUT, 4165 __LINE__); 4166 } 4167 stcb->asoc.overall_error_count = 0; 4168 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4169 } 4170 break; 4171 case SCTP_ECN_ECHO: 4172 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 4173 /* He's alive so give him credit */ 4174 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4175 /* Its not ours */ 4176 if (locked_tcb) { 4177 SCTP_TCB_UNLOCK(locked_tcb); 4178 } 4179 *offset = length; 4180 return (NULL); 4181 } 4182 if (stcb) { 4183 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4184 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4185 stcb->asoc.overall_error_count, 4186 0, 4187 SCTP_FROM_SCTP_INPUT, 4188 __LINE__); 4189 } 4190 stcb->asoc.overall_error_count = 0; 4191 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 4192 stcb); 4193 } 4194 break; 4195 case SCTP_ECN_CWR: 4196 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 4197 /* He's alive so give him credit */ 4198 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 4199 /* Its not ours */ 4200 if (locked_tcb) { 4201 SCTP_TCB_UNLOCK(locked_tcb); 4202 } 4203 *offset = length; 4204 return (NULL); 4205 } 4206 if (stcb) { 4207 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4208 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4209 stcb->asoc.overall_error_count, 4210 0, 4211 SCTP_FROM_SCTP_INPUT, 4212 __LINE__); 4213 } 4214 stcb->asoc.overall_error_count = 0; 4215 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb); 4216 } 4217 break; 4218 case SCTP_SHUTDOWN_COMPLETE: 4219 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", stcb); 4220 /* must be first and only chunk */ 4221 if ((num_chunks > 1) || 4222 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4223 *offset = length; 4224 if (locked_tcb) { 4225 SCTP_TCB_UNLOCK(locked_tcb); 4226 } 4227 return (NULL); 4228 } 4229 if ((stcb) && netp && *netp) { 4230 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 4231 stcb, *netp); 4232 } 4233 *offset = length; 4234 return (NULL); 4235 break; 4236 case SCTP_ASCONF: 4237 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 4238 /* He's alive so give him credit */ 4239 if (stcb) { 4240 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4241 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4242 stcb->asoc.overall_error_count, 4243 0, 4244 SCTP_FROM_SCTP_INPUT, 4245 __LINE__); 4246 } 4247 stcb->asoc.overall_error_count = 0; 4248 sctp_handle_asconf(m, *offset, 4249 (struct sctp_asconf_chunk *)ch, stcb); 4250 } 4251 break; 4252 case SCTP_ASCONF_ACK: 4253 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 4254 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 4255 /* Its not ours */ 4256 if (locked_tcb) { 4257 SCTP_TCB_UNLOCK(locked_tcb); 4258 } 4259 *offset = length; 4260 return (NULL); 4261 } 4262 if ((stcb) && netp && *netp) { 4263 /* He's alive so give him credit */ 4264 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4265 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4266 stcb->asoc.overall_error_count, 4267 0, 4268 SCTP_FROM_SCTP_INPUT, 4269 __LINE__); 4270 } 4271 stcb->asoc.overall_error_count = 0; 4272 sctp_handle_asconf_ack(m, *offset, 4273 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp); 4274 } 4275 break; 4276 case SCTP_FORWARD_CUM_TSN: 4277 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 4278 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 4279 /* Its not ours */ 4280 if (locked_tcb) { 4281 SCTP_TCB_UNLOCK(locked_tcb); 4282 } 4283 *offset = length; 4284 return (NULL); 4285 } 4286 /* He's alive so give him credit */ 4287 if (stcb) { 4288 int abort_flag = 0; 4289 4290 stcb->asoc.overall_error_count = 0; 4291 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4292 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4293 stcb->asoc.overall_error_count, 4294 0, 4295 SCTP_FROM_SCTP_INPUT, 4296 __LINE__); 4297 } 4298 *fwd_tsn_seen = 1; 4299 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4300 /* We are not interested anymore */ 4301 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4302 *offset = length; 4303 return (NULL); 4304 } 4305 sctp_handle_forward_tsn(stcb, 4306 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 4307 if (abort_flag) { 4308 *offset = length; 4309 return (NULL); 4310 } else { 4311 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4312 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4313 stcb->asoc.overall_error_count, 4314 0, 4315 SCTP_FROM_SCTP_INPUT, 4316 __LINE__); 4317 } 4318 stcb->asoc.overall_error_count = 0; 4319 } 4320 4321 } 4322 break; 4323 case SCTP_STREAM_RESET: 4324 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 4325 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 4326 /* Its not ours */ 4327 if (locked_tcb) { 4328 SCTP_TCB_UNLOCK(locked_tcb); 4329 } 4330 *offset = length; 4331 return (NULL); 4332 } 4333 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4334 /* We are not interested anymore */ 4335 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4336 *offset = length; 4337 return (NULL); 4338 } 4339 if (stcb->asoc.peer_supports_strreset == 0) { 4340 /* 4341 * hmm, peer should have announced this, but 4342 * we will turn it on since he is sending us 4343 * a stream reset. 4344 */ 4345 stcb->asoc.peer_supports_strreset = 1; 4346 } 4347 if (sctp_handle_stream_reset(stcb, m, *offset, (struct sctp_stream_reset_out_req *)ch)) { 4348 /* stop processing */ 4349 *offset = length; 4350 return (NULL); 4351 } 4352 break; 4353 case SCTP_PACKET_DROPPED: 4354 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 4355 /* re-get it all please */ 4356 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 4357 /* Its not ours */ 4358 if (locked_tcb) { 4359 SCTP_TCB_UNLOCK(locked_tcb); 4360 } 4361 *offset = length; 4362 return (NULL); 4363 } 4364 if (ch && (stcb) && netp && (*netp)) { 4365 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 4366 stcb, *netp, 4367 min(chk_length, (sizeof(chunk_buf) - 4))); 4368 4369 } 4370 break; 4371 4372 case SCTP_AUTHENTICATION: 4373 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 4374 if (sctp_auth_disable) 4375 goto unknown_chunk; 4376 4377 if (stcb == NULL) { 4378 /* save the first AUTH for later processing */ 4379 if (auth_skipped == 0) { 4380 auth_offset = *offset; 4381 auth_len = chk_length; 4382 auth_skipped = 1; 4383 } 4384 /* skip this chunk (temporarily) */ 4385 goto next_chunk; 4386 } 4387 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 4388 (chk_length > (sizeof(struct sctp_auth_chunk) + 4389 SCTP_AUTH_DIGEST_LEN_MAX))) { 4390 /* Its not ours */ 4391 if (locked_tcb) { 4392 SCTP_TCB_UNLOCK(locked_tcb); 4393 } 4394 *offset = length; 4395 return (NULL); 4396 } 4397 if (got_auth == 1) { 4398 /* skip this chunk... it's already auth'd */ 4399 goto next_chunk; 4400 } 4401 got_auth = 1; 4402 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 4403 m, *offset)) { 4404 /* auth HMAC failed so dump the packet */ 4405 *offset = length; 4406 return (stcb); 4407 } else { 4408 /* remaining chunks are HMAC checked */ 4409 stcb->asoc.authenticated = 1; 4410 } 4411 break; 4412 4413 default: 4414 unknown_chunk: 4415 /* it's an unknown chunk! */ 4416 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 4417 struct mbuf *mm; 4418 struct sctp_paramhdr *phd; 4419 4420 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 4421 0, M_DONTWAIT, 1, MT_DATA); 4422 if (mm) { 4423 phd = mtod(mm, struct sctp_paramhdr *); 4424 /* 4425 * We cheat and use param type since 4426 * we did not bother to define a 4427 * error cause struct. They are the 4428 * same basic format with different 4429 * names. 4430 */ 4431 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 4432 phd->param_length = htons(chk_length + sizeof(*phd)); 4433 SCTP_BUF_LEN(mm) = sizeof(*phd); 4434 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), 4435 M_DONTWAIT); 4436 if (SCTP_BUF_NEXT(mm)) { 4437 sctp_queue_op_err(stcb, mm); 4438 } else { 4439 sctp_m_freem(mm); 4440 } 4441 } 4442 } 4443 if ((ch->chunk_type & 0x80) == 0) { 4444 /* discard this packet */ 4445 *offset = length; 4446 return (stcb); 4447 } /* else skip this bad chunk and continue... */ 4448 break; 4449 } /* switch (ch->chunk_type) */ 4450 4451 4452next_chunk: 4453 /* get the next chunk */ 4454 *offset += SCTP_SIZE32(chk_length); 4455 if (*offset >= length) { 4456 /* no more data left in the mbuf chain */ 4457 break; 4458 } 4459 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4460 sizeof(struct sctp_chunkhdr), chunk_buf); 4461 if (ch == NULL) { 4462 if (locked_tcb) { 4463 SCTP_TCB_UNLOCK(locked_tcb); 4464 } 4465 *offset = length; 4466 return (NULL); 4467 } 4468 } /* while */ 4469 return (stcb); 4470} 4471 4472 4473/* 4474 * Process the ECN bits we have something set so we must look to see if it is 4475 * ECN(0) or ECN(1) or CE 4476 */ 4477static void 4478sctp_process_ecn_marked_a(struct sctp_tcb *stcb, struct sctp_nets *net, 4479 uint8_t ecn_bits) 4480{ 4481 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4482 ; 4483 } else if ((ecn_bits & SCTP_ECT1_BIT) == SCTP_ECT1_BIT) { 4484 /* 4485 * we only add to the nonce sum for ECT1, ECT0 does not 4486 * change the NS bit (that we have yet to find a way to send 4487 * it yet). 4488 */ 4489 4490 /* ECN Nonce stuff */ 4491 stcb->asoc.receiver_nonce_sum++; 4492 stcb->asoc.receiver_nonce_sum &= SCTP_SACK_NONCE_SUM; 4493 4494 /* 4495 * Drag up the last_echo point if cumack is larger since we 4496 * don't want the point falling way behind by more than 4497 * 2^^31 and then having it be incorrect. 4498 */ 4499 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4500 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4501 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4502 } 4503 } else if ((ecn_bits & SCTP_ECT0_BIT) == SCTP_ECT0_BIT) { 4504 /* 4505 * Drag up the last_echo point if cumack is larger since we 4506 * don't want the point falling way behind by more than 4507 * 2^^31 and then having it be incorrect. 4508 */ 4509 if (compare_with_wrap(stcb->asoc.cumulative_tsn, 4510 stcb->asoc.last_echo_tsn, MAX_TSN)) { 4511 stcb->asoc.last_echo_tsn = stcb->asoc.cumulative_tsn; 4512 } 4513 } 4514} 4515 4516static void 4517sctp_process_ecn_marked_b(struct sctp_tcb *stcb, struct sctp_nets *net, 4518 uint32_t high_tsn, uint8_t ecn_bits) 4519{ 4520 if ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS) { 4521 /* 4522 * we possibly must notify the sender that a congestion 4523 * window reduction is in order. We do this by adding a ECNE 4524 * chunk to the output chunk queue. The incoming CWR will 4525 * remove this chunk. 4526 */ 4527 if (compare_with_wrap(high_tsn, stcb->asoc.last_echo_tsn, 4528 MAX_TSN)) { 4529 /* Yep, we need to add a ECNE */ 4530 sctp_send_ecn_echo(stcb, net, high_tsn); 4531 stcb->asoc.last_echo_tsn = high_tsn; 4532 } 4533 } 4534} 4535 4536#ifdef INVARIANTS 4537static void 4538sctp_validate_no_locks(struct sctp_inpcb *inp) 4539{ 4540 struct sctp_tcb *stcb; 4541 4542 LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) { 4543 if (mtx_owned(&stcb->tcb_mtx)) { 4544 panic("Own lock on stcb at return from input"); 4545 } 4546 } 4547} 4548 4549#endif 4550 4551/* 4552 * common input chunk processing (v4 and v6) 4553 */ 4554void 4555sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, 4556 int length, struct sctphdr *sh, struct sctp_chunkhdr *ch, 4557 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, 4558 uint8_t ecn_bits, uint32_t vrf_id) 4559{ 4560 /* 4561 * Control chunk processing 4562 */ 4563 uint32_t high_tsn; 4564 int fwd_tsn_seen = 0, data_processed = 0; 4565 struct mbuf *m = *mm; 4566 int abort_flag = 0; 4567 int un_sent; 4568 4569 SCTP_STAT_INCR(sctps_recvdatagrams); 4570#ifdef SCTP_AUDITING_ENABLED 4571 sctp_audit_log(0xE0, 1); 4572 sctp_auditing(0, inp, stcb, net); 4573#endif 4574 4575 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d\n", 4576 m, iphlen, offset); 4577 4578 if (stcb) { 4579 /* always clear this before beginning a packet */ 4580 stcb->asoc.authenticated = 0; 4581 stcb->asoc.seen_a_sack_this_pkt = 0; 4582 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 4583 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 4584 /*- 4585 * If we hit here, we had a ref count 4586 * up when the assoc was aborted and the 4587 * timer is clearing out the assoc, we should 4588 * NOT respond to any packet.. its OOTB. 4589 */ 4590 SCTP_TCB_UNLOCK(stcb); 4591 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4592 vrf_id); 4593 goto out_now; 4594 } 4595 } 4596 if (IS_SCTP_CONTROL(ch)) { 4597 /* process the control portion of the SCTP packet */ 4598 /* sa_ignore NO_NULL_CHK */ 4599 stcb = sctp_process_control(m, iphlen, &offset, length, sh, ch, 4600 inp, stcb, &net, &fwd_tsn_seen, vrf_id); 4601 if (stcb) { 4602 /* 4603 * This covers us if the cookie-echo was there and 4604 * it changes our INP. 4605 */ 4606 inp = stcb->sctp_ep; 4607 } 4608 } else { 4609 /* 4610 * no control chunks, so pre-process DATA chunks (these 4611 * checks are taken care of by control processing) 4612 */ 4613 4614 /* 4615 * if DATA only packet, and auth is required, then punt... 4616 * can't have authenticated without any AUTH (control) 4617 * chunks 4618 */ 4619 if ((stcb != NULL) && !sctp_auth_disable && 4620 sctp_auth_is_required_chunk(SCTP_DATA, 4621 stcb->asoc.local_auth_chunks)) { 4622 /* "silently" ignore */ 4623 SCTP_STAT_INCR(sctps_recvauthmissing); 4624 SCTP_TCB_UNLOCK(stcb); 4625 goto out_now; 4626 } 4627 if (stcb == NULL) { 4628 /* out of the blue DATA chunk */ 4629 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4630 vrf_id); 4631 goto out_now; 4632 } 4633 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 4634 /* v_tag mismatch! */ 4635 SCTP_STAT_INCR(sctps_badvtag); 4636 SCTP_TCB_UNLOCK(stcb); 4637 goto out_now; 4638 } 4639 } 4640 4641 if (stcb == NULL) { 4642 /* 4643 * no valid TCB for this packet, or we found it's a bad 4644 * packet while processing control, or we're done with this 4645 * packet (done or skip rest of data), so we drop it... 4646 */ 4647 goto out_now; 4648 } 4649 /* 4650 * DATA chunk processing 4651 */ 4652 /* plow through the data chunks while length > offset */ 4653 4654 /* 4655 * Rest should be DATA only. Check authentication state if AUTH for 4656 * DATA is required. 4657 */ 4658 if ((length > offset) && (stcb != NULL) && !sctp_auth_disable && 4659 sctp_auth_is_required_chunk(SCTP_DATA, 4660 stcb->asoc.local_auth_chunks) && 4661 !stcb->asoc.authenticated) { 4662 /* "silently" ignore */ 4663 SCTP_STAT_INCR(sctps_recvauthmissing); 4664 SCTPDBG(SCTP_DEBUG_AUTH1, 4665 "Data chunk requires AUTH, skipped\n"); 4666 goto trigger_send; 4667 } 4668 if (length > offset) { 4669 int retval; 4670 4671 /* 4672 * First check to make sure our state is correct. We would 4673 * not get here unless we really did have a tag, so we don't 4674 * abort if this happens, just dump the chunk silently. 4675 */ 4676 switch (SCTP_GET_STATE(&stcb->asoc)) { 4677 case SCTP_STATE_COOKIE_ECHOED: 4678 /* 4679 * we consider data with valid tags in this state 4680 * shows us the cookie-ack was lost. Imply it was 4681 * there. 4682 */ 4683 if (sctp_logging_level & SCTP_THRESHOLD_LOGGING) { 4684 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4685 stcb->asoc.overall_error_count, 4686 0, 4687 SCTP_FROM_SCTP_INPUT, 4688 __LINE__); 4689 } 4690 stcb->asoc.overall_error_count = 0; 4691 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 4692 break; 4693 case SCTP_STATE_COOKIE_WAIT: 4694 /* 4695 * We consider OOTB any data sent during asoc setup. 4696 */ 4697 sctp_handle_ootb(m, iphlen, offset, sh, inp, NULL, 4698 vrf_id); 4699 SCTP_TCB_UNLOCK(stcb); 4700 goto out_now; 4701 /* sa_ignore NOTREACHED */ 4702 break; 4703 case SCTP_STATE_EMPTY: /* should not happen */ 4704 case SCTP_STATE_INUSE: /* should not happen */ 4705 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 4706 case SCTP_STATE_SHUTDOWN_ACK_SENT: 4707 default: 4708 SCTP_TCB_UNLOCK(stcb); 4709 goto out_now; 4710 /* sa_ignore NOTREACHED */ 4711 break; 4712 case SCTP_STATE_OPEN: 4713 case SCTP_STATE_SHUTDOWN_SENT: 4714 break; 4715 } 4716 /* take care of ECN, part 1. */ 4717 if (stcb->asoc.ecn_allowed && 4718 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4719 sctp_process_ecn_marked_a(stcb, net, ecn_bits); 4720 } 4721 /* plow through the data chunks while length > offset */ 4722 retval = sctp_process_data(mm, iphlen, &offset, length, sh, 4723 inp, stcb, net, &high_tsn); 4724 if (retval == 2) { 4725 /* 4726 * The association aborted, NO UNLOCK needed since 4727 * the association is destroyed. 4728 */ 4729 goto out_now; 4730 } 4731 data_processed = 1; 4732 if (retval == 0) { 4733 /* take care of ecn part 2. */ 4734 if (stcb->asoc.ecn_allowed && 4735 (ecn_bits & (SCTP_ECT0_BIT | SCTP_ECT1_BIT))) { 4736 sctp_process_ecn_marked_b(stcb, net, high_tsn, 4737 ecn_bits); 4738 } 4739 } 4740 /* 4741 * Anything important needs to have been m_copy'ed in 4742 * process_data 4743 */ 4744 } 4745 if ((data_processed == 0) && (fwd_tsn_seen)) { 4746 int was_a_gap = 0; 4747 4748 if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, 4749 stcb->asoc.cumulative_tsn, MAX_TSN)) { 4750 /* there was a gap before this data was processed */ 4751 was_a_gap = 1; 4752 } 4753 sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); 4754 if (abort_flag) { 4755 /* Again, we aborted so NO UNLOCK needed */ 4756 goto out_now; 4757 } 4758 } 4759 /* trigger send of any chunks in queue... */ 4760trigger_send: 4761#ifdef SCTP_AUDITING_ENABLED 4762 sctp_audit_log(0xE0, 2); 4763 sctp_auditing(1, inp, stcb, net); 4764#endif 4765 SCTPDBG(SCTP_DEBUG_INPUT1, 4766 "Check for chunk output prw:%d tqe:%d tf=%d\n", 4767 stcb->asoc.peers_rwnd, 4768 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 4769 stcb->asoc.total_flight); 4770 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 4771 4772 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue) || 4773 ((un_sent) && 4774 (stcb->asoc.peers_rwnd > 0 || 4775 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 4776 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 4777 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC); 4778 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 4779 } 4780#ifdef SCTP_AUDITING_ENABLED 4781 sctp_audit_log(0xE0, 3); 4782 sctp_auditing(2, inp, stcb, net); 4783#endif 4784 SCTP_TCB_UNLOCK(stcb); 4785out_now: 4786#ifdef INVARIANTS 4787 sctp_validate_no_locks(inp); 4788#endif 4789 return; 4790} 4791 4792 4793 4794void 4795sctp_input(i_pak, off) 4796 struct mbuf *i_pak; 4797 int off; 4798 4799{ 4800#ifdef SCTP_MBUF_LOGGING 4801 struct mbuf *mat; 4802 4803#endif 4804 struct mbuf *m; 4805 int iphlen; 4806 uint32_t vrf_id = 0; 4807 uint8_t ecn_bits; 4808 struct ip *ip; 4809 struct sctphdr *sh; 4810 struct sctp_inpcb *inp = NULL; 4811 4812 uint32_t check, calc_check; 4813 struct sctp_nets *net; 4814 struct sctp_tcb *stcb = NULL; 4815 struct sctp_chunkhdr *ch; 4816 int refcount_up = 0; 4817 int length, mlen, offset; 4818 4819 4820 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 4821 SCTP_RELEASE_PKT(i_pak); 4822 return; 4823 } 4824 mlen = SCTP_HEADER_LEN(i_pak); 4825 iphlen = off; 4826 m = SCTP_HEADER_TO_CHAIN(i_pak); 4827 4828 net = NULL; 4829 SCTP_STAT_INCR(sctps_recvpackets); 4830 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 4831 4832 4833#ifdef SCTP_MBUF_LOGGING 4834 /* Log in any input mbufs */ 4835 if (sctp_logging_level & SCTP_MBUF_LOGGING_ENABLE) { 4836 mat = m; 4837 while (mat) { 4838 if (SCTP_BUF_IS_EXTENDED(mat)) { 4839 sctp_log_mb(mat, SCTP_MBUF_INPUT); 4840 } 4841 mat = SCTP_BUF_NEXT(mat); 4842 } 4843 } 4844#endif 4845#ifdef SCTP_PACKET_LOGGING 4846 if (sctp_logging_level & SCTP_LAST_PACKET_TRACING) 4847 sctp_packet_log(m, mlen); 4848#endif 4849 /* 4850 * Must take out the iphlen, since mlen expects this (only effect lb 4851 * case) 4852 */ 4853 mlen -= iphlen; 4854 4855 /* 4856 * Get IP, SCTP, and first chunk header together in first mbuf. 4857 */ 4858 ip = mtod(m, struct ip *); 4859 offset = iphlen + sizeof(*sh) + sizeof(*ch); 4860 if (SCTP_BUF_LEN(m) < offset) { 4861 if ((m = m_pullup(m, offset)) == 0) { 4862 SCTP_STAT_INCR(sctps_hdrops); 4863 return; 4864 } 4865 ip = mtod(m, struct ip *); 4866 } 4867 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 4868 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(*sh)); 4869 SCTPDBG(SCTP_DEBUG_INPUT1, 4870 "sctp_input() length:%d iphlen:%d\n", mlen, iphlen); 4871 4872 /* SCTP does not allow broadcasts or multicasts */ 4873 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 4874 goto bad; 4875 } 4876 if (SCTP_IS_IT_BROADCAST(ip->ip_dst, m)) { 4877 /* 4878 * We only look at broadcast if its a front state, All 4879 * others we will not have a tcb for anyway. 4880 */ 4881 goto bad; 4882 } 4883 /* validate SCTP checksum */ 4884 if ((sctp_no_csum_on_loopback == 0) || !SCTP_IS_IT_LOOPBACK(m)) { 4885 /* 4886 * we do NOT validate things from the loopback if the sysctl 4887 * is set to 1. 4888 */ 4889 check = sh->checksum; /* save incoming checksum */ 4890 if ((check == 0) && (sctp_no_csum_on_loopback)) { 4891 /* 4892 * special hook for where we got a local address 4893 * somehow routed across a non IFT_LOOP type 4894 * interface 4895 */ 4896 if (ip->ip_src.s_addr == ip->ip_dst.s_addr) 4897 goto sctp_skip_csum_4; 4898 } 4899 sh->checksum = 0; /* prepare for calc */ 4900 calc_check = sctp_calculate_sum(m, &mlen, iphlen); 4901 if (calc_check != check) { 4902 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 4903 calc_check, check, m, mlen, iphlen); 4904 4905 stcb = sctp_findassociation_addr(m, iphlen, 4906 offset - sizeof(*ch), 4907 sh, ch, &inp, &net, 4908 vrf_id); 4909 if ((inp) && (stcb)) { 4910 sctp_send_packet_dropped(stcb, net, m, iphlen, 1); 4911 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR); 4912 } else if ((inp != NULL) && (stcb == NULL)) { 4913 refcount_up = 1; 4914 } 4915 SCTP_STAT_INCR(sctps_badsum); 4916 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 4917 goto bad; 4918 } 4919 sh->checksum = calc_check; 4920 } 4921sctp_skip_csum_4: 4922 /* destination port of 0 is illegal, based on RFC2960. */ 4923 if (sh->dest_port == 0) { 4924 SCTP_STAT_INCR(sctps_hdrops); 4925 goto bad; 4926 } 4927 /* validate mbuf chain length with IP payload length */ 4928 if (mlen < (ip->ip_len - iphlen)) { 4929 SCTP_STAT_INCR(sctps_hdrops); 4930 goto bad; 4931 } 4932 /* 4933 * Locate pcb and tcb for datagram sctp_findassociation_addr() wants 4934 * IP/SCTP/first chunk header... 4935 */ 4936 stcb = sctp_findassociation_addr(m, iphlen, offset - sizeof(*ch), 4937 sh, ch, &inp, &net, vrf_id); 4938 /* inp's ref-count increased && stcb locked */ 4939 if (inp == NULL) { 4940 struct sctp_init_chunk *init_chk, chunk_buf; 4941 4942 SCTP_STAT_INCR(sctps_noport); 4943#ifdef ICMP_BANDLIM 4944 /* 4945 * we use the bandwidth limiting to protect against sending 4946 * too many ABORTS all at once. In this case these count the 4947 * same as an ICMP message. 4948 */ 4949 if (badport_bandlim(0) < 0) 4950 goto bad; 4951#endif /* ICMP_BANDLIM */ 4952 SCTPDBG(SCTP_DEBUG_INPUT1, 4953 "Sending a ABORT from packet entry!\n"); 4954 if (ch->chunk_type == SCTP_INITIATION) { 4955 /* 4956 * we do a trick here to get the INIT tag, dig in 4957 * and get the tag from the INIT and put it in the 4958 * common header. 4959 */ 4960 init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m, 4961 iphlen + sizeof(*sh), sizeof(*init_chk), 4962 (uint8_t *) & chunk_buf); 4963 if (init_chk != NULL) 4964 sh->v_tag = init_chk->init.initiate_tag; 4965 } 4966 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4967 sctp_send_shutdown_complete2(m, iphlen, sh, vrf_id); 4968 goto bad; 4969 } 4970 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 4971 goto bad; 4972 } 4973 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) 4974 sctp_send_abort(m, iphlen, sh, 0, NULL, vrf_id); 4975 goto bad; 4976 } else if (stcb == NULL) { 4977 refcount_up = 1; 4978 } 4979#ifdef IPSEC 4980 /* 4981 * I very much doubt any of the IPSEC stuff will work but I have no 4982 * idea, so I will leave it in place. 4983 */ 4984 if (inp && ipsec4_in_reject(m, &inp->ip_inp.inp)) { 4985 ipsec4stat.in_polvio++; 4986 SCTP_STAT_INCR(sctps_hdrops); 4987 goto bad; 4988 } 4989#endif /* IPSEC */ 4990 4991 /* 4992 * common chunk processing 4993 */ 4994 length = ip->ip_len + iphlen; 4995 offset -= sizeof(struct sctp_chunkhdr); 4996 4997 ecn_bits = ip->ip_tos; 4998 4999 /* sa_ignore NO_NULL_CHK */ 5000 sctp_common_input_processing(&m, iphlen, offset, length, sh, ch, 5001 inp, stcb, net, ecn_bits, vrf_id); 5002 /* inp's ref-count reduced && stcb unlocked */ 5003 if (m) { 5004 sctp_m_freem(m); 5005 } 5006 if ((inp) && (refcount_up)) { 5007 /* reduce ref-count */ 5008 SCTP_INP_DECR_REF(inp); 5009 } 5010 return; 5011bad: 5012 if (stcb) { 5013 SCTP_TCB_UNLOCK(stcb); 5014 } 5015 if ((inp) && (refcount_up)) { 5016 /* reduce ref-count */ 5017 SCTP_INP_DECR_REF(inp); 5018 } 5019 if (m) { 5020 sctp_m_freem(m); 5021 } 5022 return; 5023} 5024