sctp_input.c revision 240198
1/*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 240198 2012-09-07 13:36:42Z tuexen $"); 35 36#include <netinet/sctp_os.h> 37#include <netinet/sctp_var.h> 38#include <netinet/sctp_sysctl.h> 39#include <netinet/sctp_pcb.h> 40#include <netinet/sctp_header.h> 41#include <netinet/sctputil.h> 42#include <netinet/sctp_output.h> 43#include <netinet/sctp_input.h> 44#include <netinet/sctp_auth.h> 45#include <netinet/sctp_indata.h> 46#include <netinet/sctp_asconf.h> 47#include <netinet/sctp_bsd_addr.h> 48#include <netinet/sctp_timer.h> 49#include <netinet/sctp_crc32.h> 50#include <netinet/udp.h> 51#include <sys/smp.h> 52 53 54 55static void 56sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57{ 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79} 80 81/* INIT handler */ 82static void 83sctp_handle_init(struct mbuf *m, int iphlen, int offset, 84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 86 struct sctp_tcb *stcb, int *abort_no_unlock, 87 uint8_t use_mflowid, uint32_t mflowid, 88 uint32_t vrf_id, uint16_t port) 89{ 90 struct sctp_init *init; 91 struct mbuf *op_err; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 (void *)stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 } 98 /* validate length */ 99 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 100 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 101 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 102 use_mflowid, mflowid, 103 vrf_id, port); 104 if (stcb) 105 *abort_no_unlock = 1; 106 goto outnow; 107 } 108 /* validate parameters */ 109 init = &cp->init; 110 if (init->initiate_tag == 0) { 111 /* protocol error... send abort */ 112 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 113 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 114 use_mflowid, mflowid, 115 vrf_id, port); 116 if (stcb) 117 *abort_no_unlock = 1; 118 goto outnow; 119 } 120 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 121 /* invalid parameter... send abort */ 122 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 123 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 124 use_mflowid, mflowid, 125 vrf_id, port); 126 if (stcb) 127 *abort_no_unlock = 1; 128 goto outnow; 129 } 130 if (init->num_inbound_streams == 0) { 131 /* protocol error... send abort */ 132 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 133 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 134 use_mflowid, mflowid, 135 vrf_id, port); 136 if (stcb) 137 *abort_no_unlock = 1; 138 goto outnow; 139 } 140 if (init->num_outbound_streams == 0) { 141 /* protocol error... send abort */ 142 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 143 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 144 use_mflowid, mflowid, 145 vrf_id, port); 146 if (stcb) 147 *abort_no_unlock = 1; 148 goto outnow; 149 } 150 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 151 offset + ntohs(cp->ch.chunk_length))) { 152 /* auth parameter(s) error... send abort */ 153 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, NULL, 154 use_mflowid, mflowid, 155 vrf_id, port); 156 if (stcb) 157 *abort_no_unlock = 1; 158 goto outnow; 159 } 160 /* 161 * We are only accepting if we have a socket with positive 162 * so_qlimit. 163 */ 164 if ((stcb == NULL) && 165 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 166 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 167 (inp->sctp_socket == NULL) || 168 (inp->sctp_socket->so_qlimit == 0))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 sctp_send_abort(m, iphlen, src, dst, sh, 0, NULL, 183 use_mflowid, mflowid, 184 vrf_id, port); 185 } 186 goto outnow; 187 } 188 if ((stcb != NULL) && 189 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 190 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 191 sctp_send_shutdown_ack(stcb, NULL); 192 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 193 } else { 194 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 195 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 196 sh, cp, 197 use_mflowid, mflowid, 198 vrf_id, port, 199 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 200 } 201outnow: 202 if (stcb == NULL) { 203 SCTP_INP_RUNLOCK(inp); 204 } 205} 206 207/* 208 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 209 */ 210 211int 212sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 213#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 214 SCTP_UNUSED 215#endif 216) 217{ 218 int unsent_data = 0; 219 unsigned int i; 220 struct sctp_stream_queue_pending *sp; 221 struct sctp_association *asoc; 222 223 /* 224 * This function returns the number of streams that have true unsent 225 * data on them. Note that as it looks through it will clean up any 226 * places that have old data that has been sent but left at top of 227 * stream queue. 228 */ 229 asoc = &stcb->asoc; 230 SCTP_TCB_SEND_LOCK(stcb); 231 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 232 /* Check to see if some data queued */ 233 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 234 /* sa_ignore FREED_MEMORY */ 235 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 236 if (sp == NULL) { 237 continue; 238 } 239 if ((sp->msg_is_complete) && 240 (sp->length == 0) && 241 (sp->sender_all_done)) { 242 /* 243 * We are doing differed cleanup. Last time 244 * through when we took all the data the 245 * sender_all_done was not set. 246 */ 247 if (sp->put_last_out == 0) { 248 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 249 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 250 sp->sender_all_done, 251 sp->length, 252 sp->msg_is_complete, 253 sp->put_last_out); 254 } 255 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 256 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 257 if (sp->net) { 258 sctp_free_remote_addr(sp->net); 259 sp->net = NULL; 260 } 261 if (sp->data) { 262 sctp_m_freem(sp->data); 263 sp->data = NULL; 264 } 265 sctp_free_a_strmoq(stcb, sp, so_locked); 266 } else { 267 unsent_data++; 268 break; 269 } 270 } 271 } 272 SCTP_TCB_SEND_UNLOCK(stcb); 273 return (unsent_data); 274} 275 276static int 277sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 278{ 279 struct sctp_init *init; 280 struct sctp_association *asoc; 281 struct sctp_nets *lnet; 282 unsigned int i; 283 284 init = &cp->init; 285 asoc = &stcb->asoc; 286 /* save off parameters */ 287 asoc->peer_vtag = ntohl(init->initiate_tag); 288 asoc->peers_rwnd = ntohl(init->a_rwnd); 289 /* init tsn's */ 290 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 291 292 if (!TAILQ_EMPTY(&asoc->nets)) { 293 /* update any ssthresh's that may have a default */ 294 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 295 lnet->ssthresh = asoc->peers_rwnd; 296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 297 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 298 } 299 } 300 } 301 SCTP_TCB_SEND_LOCK(stcb); 302 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 303 unsigned int newcnt; 304 struct sctp_stream_out *outs; 305 struct sctp_stream_queue_pending *sp, *nsp; 306 struct sctp_tmit_chunk *chk, *nchk; 307 308 /* abandon the upper streams */ 309 newcnt = ntohs(init->num_inbound_streams); 310 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 311 if (chk->rec.data.stream_number >= newcnt) { 312 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 313 asoc->send_queue_cnt--; 314 if (chk->data != NULL) { 315 sctp_free_bufspace(stcb, asoc, chk, 1); 316 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 317 0, chk, SCTP_SO_NOT_LOCKED); 318 if (chk->data) { 319 sctp_m_freem(chk->data); 320 chk->data = NULL; 321 } 322 } 323 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 324 /* sa_ignore FREED_MEMORY */ 325 } 326 } 327 if (asoc->strmout) { 328 for (i = newcnt; i < asoc->pre_open_streams; i++) { 329 outs = &asoc->strmout[i]; 330 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 331 TAILQ_REMOVE(&outs->outqueue, sp, next); 332 asoc->stream_queue_cnt--; 333 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 334 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 335 if (sp->data) { 336 sctp_m_freem(sp->data); 337 sp->data = NULL; 338 } 339 if (sp->net) { 340 sctp_free_remote_addr(sp->net); 341 sp->net = NULL; 342 } 343 /* Free the chunk */ 344 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 345 /* sa_ignore FREED_MEMORY */ 346 } 347 } 348 } 349 /* cut back the count */ 350 asoc->pre_open_streams = newcnt; 351 } 352 SCTP_TCB_SEND_UNLOCK(stcb); 353 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 354 355 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 356 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 357 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 358 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 359 } 360 /* This is the next one we expect */ 361 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 362 363 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 364 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 365 366 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 367 /* open the requested streams */ 368 369 if (asoc->strmin != NULL) { 370 /* Free the old ones */ 371 struct sctp_queued_to_read *ctl, *nctl; 372 373 for (i = 0; i < asoc->streamincnt; i++) { 374 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 375 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 376 sctp_free_remote_addr(ctl->whoFrom); 377 ctl->whoFrom = NULL; 378 sctp_m_freem(ctl->data); 379 ctl->data = NULL; 380 sctp_free_a_readq(stcb, ctl); 381 } 382 } 383 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 384 } 385 asoc->streamincnt = ntohs(init->num_outbound_streams); 386 if (asoc->streamincnt > MAX_SCTP_STREAMS) { 387 asoc->streamincnt = MAX_SCTP_STREAMS; 388 } 389 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 390 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 391 if (asoc->strmin == NULL) { 392 /* we didn't get memory for the streams! */ 393 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 394 return (-1); 395 } 396 for (i = 0; i < asoc->streamincnt; i++) { 397 asoc->strmin[i].stream_no = i; 398 asoc->strmin[i].last_sequence_delivered = 0xffff; 399 /* 400 * U-stream ranges will be set when the cookie is unpacked. 401 * Or for the INIT sender they are un set (if pr-sctp not 402 * supported) when the INIT-ACK arrives. 403 */ 404 TAILQ_INIT(&asoc->strmin[i].inqueue); 405 asoc->strmin[i].delivery_started = 0; 406 } 407 /* 408 * load_address_from_init will put the addresses into the 409 * association when the COOKIE is processed or the INIT-ACK is 410 * processed. Both types of COOKIE's existing and new call this 411 * routine. It will remove addresses that are no longer in the 412 * association (for the restarting case where addresses are 413 * removed). Up front when the INIT arrives we will discard it if it 414 * is a restart and new addresses have been added. 415 */ 416 /* sa_ignore MEMLEAK */ 417 return (0); 418} 419 420/* 421 * INIT-ACK message processing/consumption returns value < 0 on error 422 */ 423static int 424sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 425 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 426 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 427 struct sctp_nets *net, int *abort_no_unlock, 428 uint8_t use_mflowid, uint32_t mflowid, 429 uint32_t vrf_id) 430{ 431 struct sctp_association *asoc; 432 struct mbuf *op_err; 433 int retval, abort_flag; 434 uint32_t initack_limit; 435 int nat_friendly = 0; 436 437 /* First verify that we have no illegal param's */ 438 abort_flag = 0; 439 op_err = NULL; 440 441 op_err = sctp_arethere_unrecognized_parameters(m, 442 (offset + sizeof(struct sctp_init_chunk)), 443 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 444 if (abort_flag) { 445 /* Send an abort and notify peer */ 446 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 447 *abort_no_unlock = 1; 448 return (-1); 449 } 450 asoc = &stcb->asoc; 451 asoc->peer_supports_nat = (uint8_t) nat_friendly; 452 /* process the peer's parameters in the INIT-ACK */ 453 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 454 if (retval < 0) { 455 return (retval); 456 } 457 initack_limit = offset + ntohs(cp->ch.chunk_length); 458 /* load all addresses */ 459 if ((retval = sctp_load_addresses_from_init(stcb, m, 460 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 461 src, dst, NULL))) { 462 /* Huh, we should abort */ 463 SCTPDBG(SCTP_DEBUG_INPUT1, 464 "Load addresses from INIT causes an abort %d\n", 465 retval); 466 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 467 src, dst, sh, NULL, 468 use_mflowid, mflowid, 469 vrf_id, net->port); 470 *abort_no_unlock = 1; 471 return (-1); 472 } 473 /* if the peer doesn't support asconf, flush the asconf queue */ 474 if (asoc->peer_supports_asconf == 0) { 475 struct sctp_asconf_addr *param, *nparam; 476 477 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 478 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 479 SCTP_FREE(param, SCTP_M_ASC_ADDR); 480 } 481 } 482 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 483 stcb->asoc.local_hmacs); 484 if (op_err) { 485 sctp_queue_op_err(stcb, op_err); 486 /* queuing will steal away the mbuf chain to the out queue */ 487 op_err = NULL; 488 } 489 /* extract the cookie and queue it to "echo" it back... */ 490 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 491 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 492 stcb->asoc.overall_error_count, 493 0, 494 SCTP_FROM_SCTP_INPUT, 495 __LINE__); 496 } 497 stcb->asoc.overall_error_count = 0; 498 net->error_count = 0; 499 500 /* 501 * Cancel the INIT timer, We do this first before queueing the 502 * cookie. We always cancel at the primary to assue that we are 503 * canceling the timer started by the INIT which always goes to the 504 * primary. 505 */ 506 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 507 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 508 509 /* calculate the RTO */ 510 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 511 SCTP_RTT_FROM_NON_DATA); 512 513 retval = sctp_send_cookie_echo(m, offset, stcb, net); 514 if (retval < 0) { 515 /* 516 * No cookie, we probably should send a op error. But in any 517 * case if there is no cookie in the INIT-ACK, we can 518 * abandon the peer, its broke. 519 */ 520 if (retval == -3) { 521 /* We abort with an error of missing mandatory param */ 522 op_err = 523 sctp_generate_invmanparam(SCTP_CAUSE_MISSING_PARAM); 524 if (op_err) { 525 /* 526 * Expand beyond to include the mandatory 527 * param cookie 528 */ 529 struct sctp_inv_mandatory_param *mp; 530 531 SCTP_BUF_LEN(op_err) = 532 sizeof(struct sctp_inv_mandatory_param); 533 mp = mtod(op_err, 534 struct sctp_inv_mandatory_param *); 535 /* Subtract the reserved param */ 536 mp->length = 537 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 538 mp->num_param = htonl(1); 539 mp->param = htons(SCTP_STATE_COOKIE); 540 mp->resv = 0; 541 } 542 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 543 src, dst, sh, op_err, 544 use_mflowid, mflowid, 545 vrf_id, net->port); 546 *abort_no_unlock = 1; 547 } 548 return (retval); 549 } 550 return (0); 551} 552 553static void 554sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 555 struct sctp_tcb *stcb, struct sctp_nets *net) 556{ 557 struct sockaddr_storage store; 558 struct sctp_nets *r_net, *f_net; 559 struct timeval tv; 560 int req_prim = 0; 561 uint16_t old_error_counter; 562 563#ifdef INET 564 struct sockaddr_in *sin; 565 566#endif 567#ifdef INET6 568 struct sockaddr_in6 *sin6; 569 570#endif 571 572 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 573 /* Invalid length */ 574 return; 575 } 576 memset(&store, 0, sizeof(store)); 577 switch (cp->heartbeat.hb_info.addr_family) { 578#ifdef INET 579 case AF_INET: 580 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 581 sin = (struct sockaddr_in *)&store; 582 sin->sin_family = cp->heartbeat.hb_info.addr_family; 583 sin->sin_len = cp->heartbeat.hb_info.addr_len; 584 sin->sin_port = stcb->rport; 585 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 586 sizeof(sin->sin_addr)); 587 } else { 588 return; 589 } 590 break; 591#endif 592#ifdef INET6 593 case AF_INET6: 594 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 595 sin6 = (struct sockaddr_in6 *)&store; 596 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 597 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 598 sin6->sin6_port = stcb->rport; 599 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 600 sizeof(sin6->sin6_addr)); 601 } else { 602 return; 603 } 604 break; 605#endif 606 default: 607 return; 608 } 609 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 610 if (r_net == NULL) { 611 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 612 return; 613 } 614 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 615 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 616 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 617 /* 618 * If the its a HB and it's random value is correct when can 619 * confirm the destination. 620 */ 621 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 622 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 623 stcb->asoc.primary_destination = r_net; 624 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 625 f_net = TAILQ_FIRST(&stcb->asoc.nets); 626 if (f_net != r_net) { 627 /* 628 * first one on the list is NOT the primary 629 * sctp_cmpaddr() is much more efficent if 630 * the primary is the first on the list, 631 * make it so. 632 */ 633 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 634 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 635 } 636 req_prim = 1; 637 } 638 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 639 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 640 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 641 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 642 } 643 old_error_counter = r_net->error_count; 644 r_net->error_count = 0; 645 r_net->hb_responded = 1; 646 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 647 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 648 /* Now lets do a RTO with this */ 649 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 650 SCTP_RTT_FROM_NON_DATA); 651 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 652 r_net->dest_state |= SCTP_ADDR_REACHABLE; 653 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 654 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 655 } 656 if (r_net->dest_state & SCTP_ADDR_PF) { 657 r_net->dest_state &= ~SCTP_ADDR_PF; 658 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 659 } 660 if (old_error_counter > 0) { 661 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 662 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 663 } 664 if (r_net == stcb->asoc.primary_destination) { 665 if (stcb->asoc.alternate) { 666 /* release the alternate, primary is good */ 667 sctp_free_remote_addr(stcb->asoc.alternate); 668 stcb->asoc.alternate = NULL; 669 } 670 } 671 /* Mobility adaptation */ 672 if (req_prim) { 673 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_BASE) || 675 sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_FASTHANDOFF)) && 677 sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_PRIM_DELETED)) { 679 680 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 681 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) { 683 sctp_assoc_immediate_retrans(stcb, 684 stcb->asoc.primary_destination); 685 } 686 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_BASE)) { 688 sctp_move_chunks_from_net(stcb, 689 stcb->asoc.deleted_primary); 690 } 691 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 692 stcb->asoc.deleted_primary); 693 } 694 } 695} 696 697static int 698sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 699{ 700 /* 701 * return 0 means we want you to proceed with the abort non-zero 702 * means no abort processing 703 */ 704 struct sctpasochead *head; 705 706 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 707 /* generate a new vtag and send init */ 708 LIST_REMOVE(stcb, sctp_asocs); 709 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 710 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 711 /* 712 * put it in the bucket in the vtag hash of assoc's for the 713 * system 714 */ 715 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 716 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 717 return (1); 718 } 719 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 720 /* 721 * treat like a case where the cookie expired i.e.: - dump 722 * current cookie. - generate a new vtag. - resend init. 723 */ 724 /* generate a new vtag and send init */ 725 LIST_REMOVE(stcb, sctp_asocs); 726 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 727 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 728 sctp_stop_all_cookie_timers(stcb); 729 sctp_toss_old_cookies(stcb, &stcb->asoc); 730 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 731 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 732 /* 733 * put it in the bucket in the vtag hash of assoc's for the 734 * system 735 */ 736 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 737 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 738 return (1); 739 } 740 return (0); 741} 742 743static int 744sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 745 struct sctp_nets *net) 746{ 747 /* 748 * return 0 means we want you to proceed with the abort non-zero 749 * means no abort processing 750 */ 751 if (stcb->asoc.peer_supports_auth == 0) { 752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 753 return (0); 754 } 755 sctp_asconf_send_nat_state_update(stcb, net); 756 return (1); 757} 758 759 760static void 761sctp_handle_abort(struct sctp_abort_chunk *abort, 762 struct sctp_tcb *stcb, struct sctp_nets *net) 763{ 764#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 765 struct socket *so; 766 767#endif 768 uint16_t len; 769 uint16_t error; 770 771 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 772 if (stcb == NULL) 773 return; 774 775 len = ntohs(abort->ch.chunk_length); 776 if (len > sizeof(struct sctp_chunkhdr)) { 777 /* 778 * Need to check the cause codes for our two magic nat 779 * aborts which don't kill the assoc necessarily. 780 */ 781 struct sctp_missing_nat_state *natc; 782 783 natc = (struct sctp_missing_nat_state *)(abort + 1); 784 error = ntohs(natc->cause); 785 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 786 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 787 abort->ch.chunk_flags); 788 if (sctp_handle_nat_colliding_state(stcb)) { 789 return; 790 } 791 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 792 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 793 abort->ch.chunk_flags); 794 if (sctp_handle_nat_missing_state(stcb, net)) { 795 return; 796 } 797 } 798 } else { 799 error = 0; 800 } 801 /* stop any receive timers */ 802 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 803 /* notify user of the abort and clean up... */ 804 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 805 /* free the tcb */ 806 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 807 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 808 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 809 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 810 } 811#ifdef SCTP_ASOCLOG_OF_TSNS 812 sctp_print_out_track_log(stcb); 813#endif 814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 815 so = SCTP_INP_SO(stcb->sctp_ep); 816 atomic_add_int(&stcb->asoc.refcnt, 1); 817 SCTP_TCB_UNLOCK(stcb); 818 SCTP_SOCKET_LOCK(so, 1); 819 SCTP_TCB_LOCK(stcb); 820 atomic_subtract_int(&stcb->asoc.refcnt, 1); 821#endif 822 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 823 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 824 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 825#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 826 SCTP_SOCKET_UNLOCK(so, 1); 827#endif 828 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 829} 830 831static void 832sctp_start_net_timers(struct sctp_tcb *stcb) 833{ 834 uint32_t cnt_hb_sent; 835 struct sctp_nets *net; 836 837 cnt_hb_sent = 0; 838 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 839 /* 840 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 841 * If the dest in unconfirmed send a hb as well if under 842 * max_hb_burst have been sent. 843 */ 844 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 845 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 846 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 847 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 848 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 849 cnt_hb_sent++; 850 } 851 } 852 if (cnt_hb_sent) { 853 sctp_chunk_output(stcb->sctp_ep, stcb, 854 SCTP_OUTPUT_FROM_COOKIE_ACK, 855 SCTP_SO_NOT_LOCKED); 856 } 857} 858 859 860static void 861sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 862 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 863{ 864 struct sctp_association *asoc; 865 int some_on_streamwheel; 866 867#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 868 struct socket *so; 869 870#endif 871 872 SCTPDBG(SCTP_DEBUG_INPUT2, 873 "sctp_handle_shutdown: handling SHUTDOWN\n"); 874 if (stcb == NULL) 875 return; 876 asoc = &stcb->asoc; 877 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 878 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 879 return; 880 } 881 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 882 /* Shutdown NOT the expected size */ 883 return; 884 } else { 885 sctp_update_acked(stcb, cp, abort_flag); 886 if (*abort_flag) { 887 return; 888 } 889 } 890 if (asoc->control_pdapi) { 891 /* 892 * With a normal shutdown we assume the end of last record. 893 */ 894 SCTP_INP_READ_LOCK(stcb->sctp_ep); 895 asoc->control_pdapi->end_added = 1; 896 asoc->control_pdapi->pdapi_aborted = 1; 897 asoc->control_pdapi = NULL; 898 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 899#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 900 so = SCTP_INP_SO(stcb->sctp_ep); 901 atomic_add_int(&stcb->asoc.refcnt, 1); 902 SCTP_TCB_UNLOCK(stcb); 903 SCTP_SOCKET_LOCK(so, 1); 904 SCTP_TCB_LOCK(stcb); 905 atomic_subtract_int(&stcb->asoc.refcnt, 1); 906 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 907 /* assoc was freed while we were unlocked */ 908 SCTP_SOCKET_UNLOCK(so, 1); 909 return; 910 } 911#endif 912 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 913#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 914 SCTP_SOCKET_UNLOCK(so, 1); 915#endif 916 } 917 /* goto SHUTDOWN_RECEIVED state to block new requests */ 918 if (stcb->sctp_socket) { 919 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 920 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 922 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 923 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 924 /* 925 * notify upper layer that peer has initiated a 926 * shutdown 927 */ 928 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 929 930 /* reset time */ 931 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 932 } 933 } 934 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 935 /* 936 * stop the shutdown timer, since we WILL move to 937 * SHUTDOWN-ACK-SENT. 938 */ 939 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 940 } 941 /* Now is there unsent data on a stream somewhere? */ 942 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 943 944 if (!TAILQ_EMPTY(&asoc->send_queue) || 945 !TAILQ_EMPTY(&asoc->sent_queue) || 946 some_on_streamwheel) { 947 /* By returning we will push more data out */ 948 return; 949 } else { 950 /* no outstanding data to send, so move on... */ 951 /* send SHUTDOWN-ACK */ 952 sctp_send_shutdown_ack(stcb, net); 953 /* move to SHUTDOWN-ACK-SENT state */ 954 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 955 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 956 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 957 } 958 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 959 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 960 sctp_stop_timers_for_shutdown(stcb); 961 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 962 stcb, net); 963 } 964} 965 966static void 967sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 968 struct sctp_tcb *stcb, 969 struct sctp_nets *net) 970{ 971 struct sctp_association *asoc; 972 973#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 974 struct socket *so; 975 976 so = SCTP_INP_SO(stcb->sctp_ep); 977#endif 978 SCTPDBG(SCTP_DEBUG_INPUT2, 979 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 980 if (stcb == NULL) 981 return; 982 983 asoc = &stcb->asoc; 984 /* process according to association state */ 985 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 986 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 987 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 988 sctp_send_shutdown_complete(stcb, net, 1); 989 SCTP_TCB_UNLOCK(stcb); 990 return; 991 } 992 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 993 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 994 /* unexpected SHUTDOWN-ACK... so ignore... */ 995 SCTP_TCB_UNLOCK(stcb); 996 return; 997 } 998 if (asoc->control_pdapi) { 999 /* 1000 * With a normal shutdown we assume the end of last record. 1001 */ 1002 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1003 asoc->control_pdapi->end_added = 1; 1004 asoc->control_pdapi->pdapi_aborted = 1; 1005 asoc->control_pdapi = NULL; 1006 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1007#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1008 atomic_add_int(&stcb->asoc.refcnt, 1); 1009 SCTP_TCB_UNLOCK(stcb); 1010 SCTP_SOCKET_LOCK(so, 1); 1011 SCTP_TCB_LOCK(stcb); 1012 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1013 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1014 /* assoc was freed while we were unlocked */ 1015 SCTP_SOCKET_UNLOCK(so, 1); 1016 return; 1017 } 1018#endif 1019 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1020#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1021 SCTP_SOCKET_UNLOCK(so, 1); 1022#endif 1023 } 1024 /* are the queues empty? */ 1025 if (!TAILQ_EMPTY(&asoc->send_queue) || 1026 !TAILQ_EMPTY(&asoc->sent_queue) || 1027 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1028 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 1029 } 1030 /* stop the timer */ 1031 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1032 /* send SHUTDOWN-COMPLETE */ 1033 sctp_send_shutdown_complete(stcb, net, 0); 1034 /* notify upper layer protocol */ 1035 if (stcb->sctp_socket) { 1036 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1037 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1038 stcb->sctp_socket->so_snd.sb_cc = 0; 1039 } 1040 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1041 } 1042 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1043 /* free the TCB but first save off the ep */ 1044#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1045 atomic_add_int(&stcb->asoc.refcnt, 1); 1046 SCTP_TCB_UNLOCK(stcb); 1047 SCTP_SOCKET_LOCK(so, 1); 1048 SCTP_TCB_LOCK(stcb); 1049 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1050#endif 1051 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1052 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1053#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 SCTP_SOCKET_UNLOCK(so, 1); 1055#endif 1056} 1057 1058/* 1059 * Skip past the param header and then we will find the chunk that caused the 1060 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1061 * our peer must be broken. 1062 */ 1063static void 1064sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1065 struct sctp_nets *net) 1066{ 1067 struct sctp_chunkhdr *chk; 1068 1069 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1070 switch (chk->chunk_type) { 1071 case SCTP_ASCONF_ACK: 1072 case SCTP_ASCONF: 1073 sctp_asconf_cleanup(stcb, net); 1074 break; 1075 case SCTP_FORWARD_CUM_TSN: 1076 stcb->asoc.peer_supports_prsctp = 0; 1077 break; 1078 default: 1079 SCTPDBG(SCTP_DEBUG_INPUT2, 1080 "Peer does not support chunk type %d(%x)??\n", 1081 chk->chunk_type, (uint32_t) chk->chunk_type); 1082 break; 1083 } 1084} 1085 1086/* 1087 * Skip past the param header and then we will find the param that caused the 1088 * problem. There are a number of param's in a ASCONF OR the prsctp param 1089 * these will turn of specific features. 1090 */ 1091static void 1092sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1093{ 1094 struct sctp_paramhdr *pbad; 1095 1096 pbad = phdr + 1; 1097 switch (ntohs(pbad->param_type)) { 1098 /* pr-sctp draft */ 1099 case SCTP_PRSCTP_SUPPORTED: 1100 stcb->asoc.peer_supports_prsctp = 0; 1101 break; 1102 case SCTP_SUPPORTED_CHUNK_EXT: 1103 break; 1104 /* draft-ietf-tsvwg-addip-sctp */ 1105 case SCTP_HAS_NAT_SUPPORT: 1106 stcb->asoc.peer_supports_nat = 0; 1107 break; 1108 case SCTP_ADD_IP_ADDRESS: 1109 case SCTP_DEL_IP_ADDRESS: 1110 case SCTP_SET_PRIM_ADDR: 1111 stcb->asoc.peer_supports_asconf = 0; 1112 break; 1113 case SCTP_SUCCESS_REPORT: 1114 case SCTP_ERROR_CAUSE_IND: 1115 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1116 SCTPDBG(SCTP_DEBUG_INPUT2, 1117 "Turning off ASCONF to this strange peer\n"); 1118 stcb->asoc.peer_supports_asconf = 0; 1119 break; 1120 default: 1121 SCTPDBG(SCTP_DEBUG_INPUT2, 1122 "Peer does not support param type %d(%x)??\n", 1123 pbad->param_type, (uint32_t) pbad->param_type); 1124 break; 1125 } 1126} 1127 1128static int 1129sctp_handle_error(struct sctp_chunkhdr *ch, 1130 struct sctp_tcb *stcb, struct sctp_nets *net) 1131{ 1132 int chklen; 1133 struct sctp_paramhdr *phdr; 1134 uint16_t error, error_type; 1135 uint16_t error_len; 1136 struct sctp_association *asoc; 1137 int adjust; 1138 1139#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1140 struct socket *so; 1141 1142#endif 1143 1144 /* parse through all of the errors and process */ 1145 asoc = &stcb->asoc; 1146 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1147 sizeof(struct sctp_chunkhdr)); 1148 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1149 error = 0; 1150 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1151 /* Process an Error Cause */ 1152 error_type = ntohs(phdr->param_type); 1153 error_len = ntohs(phdr->param_length); 1154 if ((error_len > chklen) || (error_len == 0)) { 1155 /* invalid param length for this param */ 1156 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1157 chklen, error_len); 1158 return (0); 1159 } 1160 if (error == 0) { 1161 /* report the first error cause */ 1162 error = error_type; 1163 } 1164 switch (error_type) { 1165 case SCTP_CAUSE_INVALID_STREAM: 1166 case SCTP_CAUSE_MISSING_PARAM: 1167 case SCTP_CAUSE_INVALID_PARAM: 1168 case SCTP_CAUSE_NO_USER_DATA: 1169 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1170 error_type); 1171 break; 1172 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1173 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1174 ch->chunk_flags); 1175 if (sctp_handle_nat_colliding_state(stcb)) { 1176 return (0); 1177 } 1178 break; 1179 case SCTP_CAUSE_NAT_MISSING_STATE: 1180 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1181 ch->chunk_flags); 1182 if (sctp_handle_nat_missing_state(stcb, net)) { 1183 return (0); 1184 } 1185 break; 1186 case SCTP_CAUSE_STALE_COOKIE: 1187 /* 1188 * We only act if we have echoed a cookie and are 1189 * waiting. 1190 */ 1191 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1192 int *p; 1193 1194 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1195 /* Save the time doubled */ 1196 asoc->cookie_preserve_req = ntohl(*p) << 1; 1197 asoc->stale_cookie_count++; 1198 if (asoc->stale_cookie_count > 1199 asoc->max_init_times) { 1200 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1201 /* now free the asoc */ 1202#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1203 so = SCTP_INP_SO(stcb->sctp_ep); 1204 atomic_add_int(&stcb->asoc.refcnt, 1); 1205 SCTP_TCB_UNLOCK(stcb); 1206 SCTP_SOCKET_LOCK(so, 1); 1207 SCTP_TCB_LOCK(stcb); 1208 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1209#endif 1210 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1211 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1212#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1213 SCTP_SOCKET_UNLOCK(so, 1); 1214#endif 1215 return (-1); 1216 } 1217 /* blast back to INIT state */ 1218 sctp_toss_old_cookies(stcb, &stcb->asoc); 1219 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1220 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1221 sctp_stop_all_cookie_timers(stcb); 1222 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1223 } 1224 break; 1225 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1226 /* 1227 * Nothing we can do here, we don't do hostname 1228 * addresses so if the peer does not like my IPv6 1229 * (or IPv4 for that matter) it does not matter. If 1230 * they don't support that type of address, they can 1231 * NOT possibly get that packet type... i.e. with no 1232 * IPv6 you can't recieve a IPv6 packet. so we can 1233 * safely ignore this one. If we ever added support 1234 * for HOSTNAME Addresses, then we would need to do 1235 * something here. 1236 */ 1237 break; 1238 case SCTP_CAUSE_UNRECOG_CHUNK: 1239 sctp_process_unrecog_chunk(stcb, phdr, net); 1240 break; 1241 case SCTP_CAUSE_UNRECOG_PARAM: 1242 sctp_process_unrecog_param(stcb, phdr); 1243 break; 1244 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1245 /* 1246 * We ignore this since the timer will drive out a 1247 * new cookie anyway and there timer will drive us 1248 * to send a SHUTDOWN_COMPLETE. We can't send one 1249 * here since we don't have their tag. 1250 */ 1251 break; 1252 case SCTP_CAUSE_DELETING_LAST_ADDR: 1253 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1254 case SCTP_CAUSE_DELETING_SRC_ADDR: 1255 /* 1256 * We should NOT get these here, but in a 1257 * ASCONF-ACK. 1258 */ 1259 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1260 error_type); 1261 break; 1262 case SCTP_CAUSE_OUT_OF_RESC: 1263 /* 1264 * And what, pray tell do we do with the fact that 1265 * the peer is out of resources? Not really sure we 1266 * could do anything but abort. I suspect this 1267 * should have came WITH an abort instead of in a 1268 * OP-ERROR. 1269 */ 1270 break; 1271 default: 1272 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1273 error_type); 1274 break; 1275 } 1276 adjust = SCTP_SIZE32(error_len); 1277 chklen -= adjust; 1278 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1279 } 1280 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1281 return (0); 1282} 1283 1284static int 1285sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1286 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1287 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1288 struct sctp_nets *net, int *abort_no_unlock, 1289 uint8_t use_mflowid, uint32_t mflowid, 1290 uint32_t vrf_id) 1291{ 1292 struct sctp_init_ack *init_ack; 1293 struct mbuf *op_err; 1294 1295 SCTPDBG(SCTP_DEBUG_INPUT2, 1296 "sctp_handle_init_ack: handling INIT-ACK\n"); 1297 1298 if (stcb == NULL) { 1299 SCTPDBG(SCTP_DEBUG_INPUT2, 1300 "sctp_handle_init_ack: TCB is null\n"); 1301 return (-1); 1302 } 1303 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1304 /* Invalid length */ 1305 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1306 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1307 src, dst, sh, op_err, 1308 use_mflowid, mflowid, 1309 vrf_id, net->port); 1310 *abort_no_unlock = 1; 1311 return (-1); 1312 } 1313 init_ack = &cp->init; 1314 /* validate parameters */ 1315 if (init_ack->initiate_tag == 0) { 1316 /* protocol error... send an abort */ 1317 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1319 src, dst, sh, op_err, 1320 use_mflowid, mflowid, 1321 vrf_id, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1328 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1329 src, dst, sh, op_err, 1330 use_mflowid, mflowid, 1331 vrf_id, net->port); 1332 *abort_no_unlock = 1; 1333 return (-1); 1334 } 1335 if (init_ack->num_inbound_streams == 0) { 1336 /* protocol error... send an abort */ 1337 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1338 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1339 src, dst, sh, op_err, 1340 use_mflowid, mflowid, 1341 vrf_id, net->port); 1342 *abort_no_unlock = 1; 1343 return (-1); 1344 } 1345 if (init_ack->num_outbound_streams == 0) { 1346 /* protocol error... send an abort */ 1347 op_err = sctp_generate_invmanparam(SCTP_CAUSE_INVALID_PARAM); 1348 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1349 src, dst, sh, op_err, 1350 use_mflowid, mflowid, 1351 vrf_id, net->port); 1352 *abort_no_unlock = 1; 1353 return (-1); 1354 } 1355 /* process according to association state... */ 1356 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1357 case SCTP_STATE_COOKIE_WAIT: 1358 /* this is the expected state for this chunk */ 1359 /* process the INIT-ACK parameters */ 1360 if (stcb->asoc.primary_destination->dest_state & 1361 SCTP_ADDR_UNCONFIRMED) { 1362 /* 1363 * The primary is where we sent the INIT, we can 1364 * always consider it confirmed when the INIT-ACK is 1365 * returned. Do this before we load addresses 1366 * though. 1367 */ 1368 stcb->asoc.primary_destination->dest_state &= 1369 ~SCTP_ADDR_UNCONFIRMED; 1370 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1371 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1372 } 1373 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1374 net, abort_no_unlock, 1375 use_mflowid, mflowid, 1376 vrf_id) < 0) { 1377 /* error in parsing parameters */ 1378 return (-1); 1379 } 1380 /* update our state */ 1381 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1382 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1383 1384 /* reset the RTO calc */ 1385 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1386 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1387 stcb->asoc.overall_error_count, 1388 0, 1389 SCTP_FROM_SCTP_INPUT, 1390 __LINE__); 1391 } 1392 stcb->asoc.overall_error_count = 0; 1393 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1394 /* 1395 * collapse the init timer back in case of a exponential 1396 * backoff 1397 */ 1398 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1399 stcb, net); 1400 /* 1401 * the send at the end of the inbound data processing will 1402 * cause the cookie to be sent 1403 */ 1404 break; 1405 case SCTP_STATE_SHUTDOWN_SENT: 1406 /* incorrect state... discard */ 1407 break; 1408 case SCTP_STATE_COOKIE_ECHOED: 1409 /* incorrect state... discard */ 1410 break; 1411 case SCTP_STATE_OPEN: 1412 /* incorrect state... discard */ 1413 break; 1414 case SCTP_STATE_EMPTY: 1415 case SCTP_STATE_INUSE: 1416 default: 1417 /* incorrect state... discard */ 1418 return (-1); 1419 break; 1420 } 1421 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1422 return (0); 1423} 1424 1425static struct sctp_tcb * 1426sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1427 struct sockaddr *src, struct sockaddr *dst, 1428 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1429 struct sctp_inpcb *inp, struct sctp_nets **netp, 1430 struct sockaddr *init_src, int *notification, 1431 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1432 uint8_t use_mflowid, uint32_t mflowid, 1433 uint32_t vrf_id, uint16_t port); 1434 1435 1436/* 1437 * handle a state cookie for an existing association m: input packet mbuf 1438 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1439 * "split" mbuf and the cookie signature does not exist offset: offset into 1440 * mbuf to the cookie-echo chunk 1441 */ 1442static struct sctp_tcb * 1443sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1444 struct sockaddr *src, struct sockaddr *dst, 1445 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1446 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1447 struct sockaddr *init_src, int *notification, 1448 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1449 uint8_t use_mflowid, uint32_t mflowid, 1450 uint32_t vrf_id, uint16_t port) 1451{ 1452 struct sctp_association *asoc; 1453 struct sctp_init_chunk *init_cp, init_buf; 1454 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1455 struct sctp_nets *net; 1456 struct mbuf *op_err; 1457 struct sctp_paramhdr *ph; 1458 int init_offset, initack_offset, i; 1459 int retval; 1460 int spec_flag = 0; 1461 uint32_t how_indx; 1462 1463 net = *netp; 1464 /* I know that the TCB is non-NULL from the caller */ 1465 asoc = &stcb->asoc; 1466 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1467 if (asoc->cookie_how[how_indx] == 0) 1468 break; 1469 } 1470 if (how_indx < sizeof(asoc->cookie_how)) { 1471 asoc->cookie_how[how_indx] = 1; 1472 } 1473 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1474 /* SHUTDOWN came in after sending INIT-ACK */ 1475 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1476 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1477 0, M_DONTWAIT, 1, MT_DATA); 1478 if (op_err == NULL) { 1479 /* FOOBAR */ 1480 return (NULL); 1481 } 1482 /* Set the len */ 1483 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1484 ph = mtod(op_err, struct sctp_paramhdr *); 1485 ph->param_type = htons(SCTP_CAUSE_COOKIE_IN_SHUTDOWN); 1486 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1487 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1488 use_mflowid, mflowid, 1489 vrf_id, net->port); 1490 if (how_indx < sizeof(asoc->cookie_how)) 1491 asoc->cookie_how[how_indx] = 2; 1492 return (NULL); 1493 } 1494 /* 1495 * find and validate the INIT chunk in the cookie (peer's info) the 1496 * INIT should start after the cookie-echo header struct (chunk 1497 * header, state cookie header struct) 1498 */ 1499 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1500 1501 init_cp = (struct sctp_init_chunk *) 1502 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1503 (uint8_t *) & init_buf); 1504 if (init_cp == NULL) { 1505 /* could not pull a INIT chunk in cookie */ 1506 return (NULL); 1507 } 1508 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1509 return (NULL); 1510 } 1511 /* 1512 * find and validate the INIT-ACK chunk in the cookie (my info) the 1513 * INIT-ACK follows the INIT chunk 1514 */ 1515 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1516 initack_cp = (struct sctp_init_ack_chunk *) 1517 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1518 (uint8_t *) & initack_buf); 1519 if (initack_cp == NULL) { 1520 /* could not pull INIT-ACK chunk in cookie */ 1521 return (NULL); 1522 } 1523 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1524 return (NULL); 1525 } 1526 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1527 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1528 /* 1529 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1530 * to get into the OPEN state 1531 */ 1532 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1533 /*- 1534 * Opps, this means that we somehow generated two vtag's 1535 * the same. I.e. we did: 1536 * Us Peer 1537 * <---INIT(tag=a)------ 1538 * ----INIT-ACK(tag=t)--> 1539 * ----INIT(tag=t)------> *1 1540 * <---INIT-ACK(tag=a)--- 1541 * <----CE(tag=t)------------- *2 1542 * 1543 * At point *1 we should be generating a different 1544 * tag t'. Which means we would throw away the CE and send 1545 * ours instead. Basically this is case C (throw away side). 1546 */ 1547 if (how_indx < sizeof(asoc->cookie_how)) 1548 asoc->cookie_how[how_indx] = 17; 1549 return (NULL); 1550 1551 } 1552 switch SCTP_GET_STATE 1553 (asoc) { 1554 case SCTP_STATE_COOKIE_WAIT: 1555 case SCTP_STATE_COOKIE_ECHOED: 1556 /* 1557 * INIT was sent but got a COOKIE_ECHO with the 1558 * correct tags... just accept it...but we must 1559 * process the init so that we can make sure we have 1560 * the right seq no's. 1561 */ 1562 /* First we must process the INIT !! */ 1563 retval = sctp_process_init(init_cp, stcb); 1564 if (retval < 0) { 1565 if (how_indx < sizeof(asoc->cookie_how)) 1566 asoc->cookie_how[how_indx] = 3; 1567 return (NULL); 1568 } 1569 /* we have already processed the INIT so no problem */ 1570 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1571 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1572 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1573 /* update current state */ 1574 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1575 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1576 else 1577 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1578 1579 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1580 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1581 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1582 stcb->sctp_ep, stcb, asoc->primary_destination); 1583 } 1584 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1585 sctp_stop_all_cookie_timers(stcb); 1586 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1587 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1588 (inp->sctp_socket->so_qlimit == 0) 1589 ) { 1590#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1591 struct socket *so; 1592 1593#endif 1594 /* 1595 * Here is where collision would go if we 1596 * did a connect() and instead got a 1597 * init/init-ack/cookie done before the 1598 * init-ack came back.. 1599 */ 1600 stcb->sctp_ep->sctp_flags |= 1601 SCTP_PCB_FLAGS_CONNECTED; 1602#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1603 so = SCTP_INP_SO(stcb->sctp_ep); 1604 atomic_add_int(&stcb->asoc.refcnt, 1); 1605 SCTP_TCB_UNLOCK(stcb); 1606 SCTP_SOCKET_LOCK(so, 1); 1607 SCTP_TCB_LOCK(stcb); 1608 atomic_add_int(&stcb->asoc.refcnt, -1); 1609 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1610 SCTP_SOCKET_UNLOCK(so, 1); 1611 return (NULL); 1612 } 1613#endif 1614 soisconnected(stcb->sctp_socket); 1615#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1616 SCTP_SOCKET_UNLOCK(so, 1); 1617#endif 1618 } 1619 /* notify upper layer */ 1620 *notification = SCTP_NOTIFY_ASSOC_UP; 1621 /* 1622 * since we did not send a HB make sure we don't 1623 * double things 1624 */ 1625 net->hb_responded = 1; 1626 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1627 &cookie->time_entered, 1628 sctp_align_unsafe_makecopy, 1629 SCTP_RTT_FROM_NON_DATA); 1630 1631 if (stcb->asoc.sctp_autoclose_ticks && 1632 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1633 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1634 inp, stcb, NULL); 1635 } 1636 break; 1637 default: 1638 /* 1639 * we're in the OPEN state (or beyond), so peer must 1640 * have simply lost the COOKIE-ACK 1641 */ 1642 break; 1643 } /* end switch */ 1644 sctp_stop_all_cookie_timers(stcb); 1645 /* 1646 * We ignore the return code here.. not sure if we should 1647 * somehow abort.. but we do have an existing asoc. This 1648 * really should not fail. 1649 */ 1650 if (sctp_load_addresses_from_init(stcb, m, 1651 init_offset + sizeof(struct sctp_init_chunk), 1652 initack_offset, src, dst, init_src)) { 1653 if (how_indx < sizeof(asoc->cookie_how)) 1654 asoc->cookie_how[how_indx] = 4; 1655 return (NULL); 1656 } 1657 /* respond with a COOKIE-ACK */ 1658 sctp_toss_old_cookies(stcb, asoc); 1659 sctp_send_cookie_ack(stcb); 1660 if (how_indx < sizeof(asoc->cookie_how)) 1661 asoc->cookie_how[how_indx] = 5; 1662 return (stcb); 1663 } 1664 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1665 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1666 cookie->tie_tag_my_vtag == 0 && 1667 cookie->tie_tag_peer_vtag == 0) { 1668 /* 1669 * case C in Section 5.2.4 Table 2: XMOO silently discard 1670 */ 1671 if (how_indx < sizeof(asoc->cookie_how)) 1672 asoc->cookie_how[how_indx] = 6; 1673 return (NULL); 1674 } 1675 /* 1676 * If nat support, and the below and stcb is established, send back 1677 * a ABORT(colliding state) if we are established. 1678 */ 1679 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1680 (asoc->peer_supports_nat) && 1681 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1682 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1683 (asoc->peer_vtag == 0)))) { 1684 /* 1685 * Special case - Peer's support nat. We may have two init's 1686 * that we gave out the same tag on since one was not 1687 * established.. i.e. we get INIT from host-1 behind the nat 1688 * and we respond tag-a, we get a INIT from host-2 behind 1689 * the nat and we get tag-a again. Then we bring up host-1 1690 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1691 * Now we have colliding state. We must send an abort here 1692 * with colliding state indication. 1693 */ 1694 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 1695 0, M_DONTWAIT, 1, MT_DATA); 1696 if (op_err == NULL) { 1697 /* FOOBAR */ 1698 return (NULL); 1699 } 1700 /* pre-reserve some space */ 1701#ifdef INET6 1702 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip6_hdr)); 1703#else 1704 SCTP_BUF_RESV_UF(op_err, sizeof(struct ip)); 1705#endif 1706 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctphdr)); 1707 SCTP_BUF_RESV_UF(op_err, sizeof(struct sctp_chunkhdr)); 1708 /* Set the len */ 1709 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr); 1710 ph = mtod(op_err, struct sctp_paramhdr *); 1711 ph->param_type = htons(SCTP_CAUSE_NAT_COLLIDING_STATE); 1712 ph->param_length = htons(sizeof(struct sctp_paramhdr)); 1713 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1714 use_mflowid, mflowid, 1715 vrf_id, port); 1716 return (NULL); 1717 } 1718 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1719 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1720 (asoc->peer_vtag == 0))) { 1721 /* 1722 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1723 * should be ok, re-accept peer info 1724 */ 1725 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1726 /* 1727 * Extension of case C. If we hit this, then the 1728 * random number generator returned the same vtag 1729 * when we first sent our INIT-ACK and when we later 1730 * sent our INIT. The side with the seq numbers that 1731 * are different will be the one that normnally 1732 * would have hit case C. This in effect "extends" 1733 * our vtags in this collision case to be 64 bits. 1734 * The same collision could occur aka you get both 1735 * vtag and seq number the same twice in a row.. but 1736 * is much less likely. If it did happen then we 1737 * would proceed through and bring up the assoc.. we 1738 * may end up with the wrong stream setup however.. 1739 * which would be bad.. but there is no way to 1740 * tell.. until we send on a stream that does not 1741 * exist :-) 1742 */ 1743 if (how_indx < sizeof(asoc->cookie_how)) 1744 asoc->cookie_how[how_indx] = 7; 1745 1746 return (NULL); 1747 } 1748 if (how_indx < sizeof(asoc->cookie_how)) 1749 asoc->cookie_how[how_indx] = 8; 1750 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1751 sctp_stop_all_cookie_timers(stcb); 1752 /* 1753 * since we did not send a HB make sure we don't double 1754 * things 1755 */ 1756 net->hb_responded = 1; 1757 if (stcb->asoc.sctp_autoclose_ticks && 1758 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1759 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1760 NULL); 1761 } 1762 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1763 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1764 1765 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1766 /* 1767 * Ok the peer probably discarded our data (if we 1768 * echoed a cookie+data). So anything on the 1769 * sent_queue should be marked for retransmit, we 1770 * may not get something to kick us so it COULD 1771 * still take a timeout to move these.. but it can't 1772 * hurt to mark them. 1773 */ 1774 struct sctp_tmit_chunk *chk; 1775 1776 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1777 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1778 chk->sent = SCTP_DATAGRAM_RESEND; 1779 sctp_flight_size_decrease(chk); 1780 sctp_total_flight_decrease(stcb, chk); 1781 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1782 spec_flag++; 1783 } 1784 } 1785 1786 } 1787 /* process the INIT info (peer's info) */ 1788 retval = sctp_process_init(init_cp, stcb); 1789 if (retval < 0) { 1790 if (how_indx < sizeof(asoc->cookie_how)) 1791 asoc->cookie_how[how_indx] = 9; 1792 return (NULL); 1793 } 1794 if (sctp_load_addresses_from_init(stcb, m, 1795 init_offset + sizeof(struct sctp_init_chunk), 1796 initack_offset, src, dst, init_src)) { 1797 if (how_indx < sizeof(asoc->cookie_how)) 1798 asoc->cookie_how[how_indx] = 10; 1799 return (NULL); 1800 } 1801 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1802 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1803 *notification = SCTP_NOTIFY_ASSOC_UP; 1804 1805 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1806 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1807 (inp->sctp_socket->so_qlimit == 0)) { 1808#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1809 struct socket *so; 1810 1811#endif 1812 stcb->sctp_ep->sctp_flags |= 1813 SCTP_PCB_FLAGS_CONNECTED; 1814#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1815 so = SCTP_INP_SO(stcb->sctp_ep); 1816 atomic_add_int(&stcb->asoc.refcnt, 1); 1817 SCTP_TCB_UNLOCK(stcb); 1818 SCTP_SOCKET_LOCK(so, 1); 1819 SCTP_TCB_LOCK(stcb); 1820 atomic_add_int(&stcb->asoc.refcnt, -1); 1821 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1822 SCTP_SOCKET_UNLOCK(so, 1); 1823 return (NULL); 1824 } 1825#endif 1826 soisconnected(stcb->sctp_socket); 1827#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1828 SCTP_SOCKET_UNLOCK(so, 1); 1829#endif 1830 } 1831 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1832 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1833 else 1834 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1835 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1836 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1837 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1838 } else { 1839 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1840 } 1841 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1842 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1843 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1844 stcb->sctp_ep, stcb, asoc->primary_destination); 1845 } 1846 sctp_stop_all_cookie_timers(stcb); 1847 sctp_toss_old_cookies(stcb, asoc); 1848 sctp_send_cookie_ack(stcb); 1849 if (spec_flag) { 1850 /* 1851 * only if we have retrans set do we do this. What 1852 * this call does is get only the COOKIE-ACK out and 1853 * then when we return the normal call to 1854 * sctp_chunk_output will get the retrans out behind 1855 * this. 1856 */ 1857 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1858 } 1859 if (how_indx < sizeof(asoc->cookie_how)) 1860 asoc->cookie_how[how_indx] = 11; 1861 1862 return (stcb); 1863 } 1864 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1865 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1866 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1867 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1868 cookie->tie_tag_peer_vtag != 0) { 1869 struct sctpasochead *head; 1870 1871 if (asoc->peer_supports_nat) { 1872 /* 1873 * This is a gross gross hack. just call the 1874 * cookie_new code since we are allowing a duplicate 1875 * association. I hope this works... 1876 */ 1877 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1878 sh, cookie, cookie_len, 1879 inp, netp, init_src, notification, 1880 auth_skipped, auth_offset, auth_len, 1881 use_mflowid, mflowid, 1882 vrf_id, port)); 1883 } 1884 /* 1885 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1886 */ 1887 /* temp code */ 1888 if (how_indx < sizeof(asoc->cookie_how)) 1889 asoc->cookie_how[how_indx] = 12; 1890 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1891 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1892 1893 /* notify upper layer */ 1894 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1895 atomic_add_int(&stcb->asoc.refcnt, 1); 1896 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1897 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1898 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1899 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1900 } 1901 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1902 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1903 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1904 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1905 } 1906 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1907 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1908 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1909 stcb->sctp_ep, stcb, asoc->primary_destination); 1910 1911 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1912 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1913 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1914 } 1915 asoc->pre_open_streams = 1916 ntohs(initack_cp->init.num_outbound_streams); 1917 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1918 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1919 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1920 1921 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1922 1923 asoc->str_reset_seq_in = asoc->init_seq_number; 1924 1925 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1926 if (asoc->mapping_array) { 1927 memset(asoc->mapping_array, 0, 1928 asoc->mapping_array_size); 1929 } 1930 if (asoc->nr_mapping_array) { 1931 memset(asoc->nr_mapping_array, 0, 1932 asoc->mapping_array_size); 1933 } 1934 SCTP_TCB_UNLOCK(stcb); 1935 SCTP_INP_INFO_WLOCK(); 1936 SCTP_INP_WLOCK(stcb->sctp_ep); 1937 SCTP_TCB_LOCK(stcb); 1938 atomic_add_int(&stcb->asoc.refcnt, -1); 1939 /* send up all the data */ 1940 SCTP_TCB_SEND_LOCK(stcb); 1941 1942 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_NOT_LOCKED); 1943 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1944 stcb->asoc.strmout[i].stream_no = i; 1945 stcb->asoc.strmout[i].next_sequence_sent = 0; 1946 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1947 } 1948 /* process the INIT-ACK info (my info) */ 1949 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1950 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1951 1952 /* pull from vtag hash */ 1953 LIST_REMOVE(stcb, sctp_asocs); 1954 /* re-insert to new vtag position */ 1955 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1956 SCTP_BASE_INFO(hashasocmark))]; 1957 /* 1958 * put it in the bucket in the vtag hash of assoc's for the 1959 * system 1960 */ 1961 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1962 1963 /* process the INIT info (peer's info) */ 1964 SCTP_TCB_SEND_UNLOCK(stcb); 1965 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1966 SCTP_INP_INFO_WUNLOCK(); 1967 1968 retval = sctp_process_init(init_cp, stcb); 1969 if (retval < 0) { 1970 if (how_indx < sizeof(asoc->cookie_how)) 1971 asoc->cookie_how[how_indx] = 13; 1972 1973 return (NULL); 1974 } 1975 /* 1976 * since we did not send a HB make sure we don't double 1977 * things 1978 */ 1979 net->hb_responded = 1; 1980 1981 if (sctp_load_addresses_from_init(stcb, m, 1982 init_offset + sizeof(struct sctp_init_chunk), 1983 initack_offset, src, dst, init_src)) { 1984 if (how_indx < sizeof(asoc->cookie_how)) 1985 asoc->cookie_how[how_indx] = 14; 1986 1987 return (NULL); 1988 } 1989 /* respond with a COOKIE-ACK */ 1990 sctp_stop_all_cookie_timers(stcb); 1991 sctp_toss_old_cookies(stcb, asoc); 1992 sctp_send_cookie_ack(stcb); 1993 if (how_indx < sizeof(asoc->cookie_how)) 1994 asoc->cookie_how[how_indx] = 15; 1995 1996 return (stcb); 1997 } 1998 if (how_indx < sizeof(asoc->cookie_how)) 1999 asoc->cookie_how[how_indx] = 16; 2000 /* all other cases... */ 2001 return (NULL); 2002} 2003 2004 2005/* 2006 * handle a state cookie for a new association m: input packet mbuf chain-- 2007 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2008 * and the cookie signature does not exist offset: offset into mbuf to the 2009 * cookie-echo chunk length: length of the cookie chunk to: where the init 2010 * was from returns a new TCB 2011 */ 2012static struct sctp_tcb * 2013sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2014 struct sockaddr *src, struct sockaddr *dst, 2015 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2016 struct sctp_inpcb *inp, struct sctp_nets **netp, 2017 struct sockaddr *init_src, int *notification, 2018 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2019 uint8_t use_mflowid, uint32_t mflowid, 2020 uint32_t vrf_id, uint16_t port) 2021{ 2022 struct sctp_tcb *stcb; 2023 struct sctp_init_chunk *init_cp, init_buf; 2024 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2025 struct sockaddr_storage sa_store; 2026 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2027 struct sctp_association *asoc; 2028 int init_offset, initack_offset, initack_limit; 2029 int retval; 2030 int error = 0; 2031 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2032 2033#ifdef INET 2034 struct sockaddr_in *sin; 2035 2036#endif 2037#ifdef INET6 2038 struct sockaddr_in6 *sin6; 2039 2040#endif 2041#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2042 struct socket *so; 2043 2044 so = SCTP_INP_SO(inp); 2045#endif 2046 2047 /* 2048 * find and validate the INIT chunk in the cookie (peer's info) the 2049 * INIT should start after the cookie-echo header struct (chunk 2050 * header, state cookie header struct) 2051 */ 2052 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2053 init_cp = (struct sctp_init_chunk *) 2054 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2055 (uint8_t *) & init_buf); 2056 if (init_cp == NULL) { 2057 /* could not pull a INIT chunk in cookie */ 2058 SCTPDBG(SCTP_DEBUG_INPUT1, 2059 "process_cookie_new: could not pull INIT chunk hdr\n"); 2060 return (NULL); 2061 } 2062 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2064 return (NULL); 2065 } 2066 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2067 /* 2068 * find and validate the INIT-ACK chunk in the cookie (my info) the 2069 * INIT-ACK follows the INIT chunk 2070 */ 2071 initack_cp = (struct sctp_init_ack_chunk *) 2072 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2073 (uint8_t *) & initack_buf); 2074 if (initack_cp == NULL) { 2075 /* could not pull INIT-ACK chunk in cookie */ 2076 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2077 return (NULL); 2078 } 2079 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2080 return (NULL); 2081 } 2082 /* 2083 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2084 * "initack_limit" value. This is because the chk_length field 2085 * includes the length of the cookie, but the cookie is omitted when 2086 * the INIT and INIT_ACK are tacked onto the cookie... 2087 */ 2088 initack_limit = offset + cookie_len; 2089 2090 /* 2091 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2092 * and popluate 2093 */ 2094 2095 /* 2096 * Here we do a trick, we set in NULL for the proc/thread argument. 2097 * We do this since in effect we only use the p argument when the 2098 * socket is unbound and we must do an implicit bind. Since we are 2099 * getting a cookie, we cannot be unbound. 2100 */ 2101 stcb = sctp_aloc_assoc(inp, init_src, &error, 2102 ntohl(initack_cp->init.initiate_tag), vrf_id, 2103 (struct thread *)NULL 2104 ); 2105 if (stcb == NULL) { 2106 struct mbuf *op_err; 2107 2108 /* memory problem? */ 2109 SCTPDBG(SCTP_DEBUG_INPUT1, 2110 "process_cookie_new: no room for another TCB!\n"); 2111 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2112 2113 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2114 src, dst, sh, op_err, 2115 use_mflowid, mflowid, 2116 vrf_id, port); 2117 return (NULL); 2118 } 2119 /* get the correct sctp_nets */ 2120 if (netp) 2121 *netp = sctp_findnet(stcb, init_src); 2122 2123 asoc = &stcb->asoc; 2124 /* get scope variables out of cookie */ 2125 asoc->ipv4_local_scope = cookie->ipv4_scope; 2126 asoc->site_scope = cookie->site_scope; 2127 asoc->local_scope = cookie->local_scope; 2128 asoc->loopback_scope = cookie->loopback_scope; 2129 2130 if ((asoc->ipv4_addr_legal != cookie->ipv4_addr_legal) || 2131 (asoc->ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2132 struct mbuf *op_err; 2133 2134 /* 2135 * Houston we have a problem. The EP changed while the 2136 * cookie was in flight. Only recourse is to abort the 2137 * association. 2138 */ 2139 atomic_add_int(&stcb->asoc.refcnt, 1); 2140 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2141 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2142 src, dst, sh, op_err, 2143 use_mflowid, mflowid, 2144 vrf_id, port); 2145#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2146 SCTP_TCB_UNLOCK(stcb); 2147 SCTP_SOCKET_LOCK(so, 1); 2148 SCTP_TCB_LOCK(stcb); 2149#endif 2150 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2151 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2152#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2153 SCTP_SOCKET_UNLOCK(so, 1); 2154#endif 2155 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2156 return (NULL); 2157 } 2158 /* process the INIT-ACK info (my info) */ 2159 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2160 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2161 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2162 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2163 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2164 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2165 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2166 asoc->str_reset_seq_in = asoc->init_seq_number; 2167 2168 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2169 2170 /* process the INIT info (peer's info) */ 2171 if (netp) 2172 retval = sctp_process_init(init_cp, stcb); 2173 else 2174 retval = 0; 2175 if (retval < 0) { 2176 atomic_add_int(&stcb->asoc.refcnt, 1); 2177#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2178 SCTP_TCB_UNLOCK(stcb); 2179 SCTP_SOCKET_LOCK(so, 1); 2180 SCTP_TCB_LOCK(stcb); 2181#endif 2182 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2183#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2184 SCTP_SOCKET_UNLOCK(so, 1); 2185#endif 2186 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2187 return (NULL); 2188 } 2189 /* load all addresses */ 2190 if (sctp_load_addresses_from_init(stcb, m, 2191 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2192 src, dst, init_src)) { 2193 atomic_add_int(&stcb->asoc.refcnt, 1); 2194#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2195 SCTP_TCB_UNLOCK(stcb); 2196 SCTP_SOCKET_LOCK(so, 1); 2197 SCTP_TCB_LOCK(stcb); 2198#endif 2199 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2200#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2201 SCTP_SOCKET_UNLOCK(so, 1); 2202#endif 2203 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2204 return (NULL); 2205 } 2206 /* 2207 * verify any preceding AUTH chunk that was skipped 2208 */ 2209 /* pull the local authentication parameters from the cookie/init-ack */ 2210 sctp_auth_get_cookie_params(stcb, m, 2211 initack_offset + sizeof(struct sctp_init_ack_chunk), 2212 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2213 if (auth_skipped) { 2214 struct sctp_auth_chunk *auth; 2215 2216 auth = (struct sctp_auth_chunk *) 2217 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2218 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2219 /* auth HMAC failed, dump the assoc and packet */ 2220 SCTPDBG(SCTP_DEBUG_AUTH1, 2221 "COOKIE-ECHO: AUTH failed\n"); 2222 atomic_add_int(&stcb->asoc.refcnt, 1); 2223#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2224 SCTP_TCB_UNLOCK(stcb); 2225 SCTP_SOCKET_LOCK(so, 1); 2226 SCTP_TCB_LOCK(stcb); 2227#endif 2228 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2229#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2230 SCTP_SOCKET_UNLOCK(so, 1); 2231#endif 2232 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2233 return (NULL); 2234 } else { 2235 /* remaining chunks checked... good to go */ 2236 stcb->asoc.authenticated = 1; 2237 } 2238 } 2239 /* update current state */ 2240 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2241 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2242 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2243 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2244 stcb->sctp_ep, stcb, asoc->primary_destination); 2245 } 2246 sctp_stop_all_cookie_timers(stcb); 2247 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2248 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2249 2250 /* 2251 * if we're doing ASCONFs, check to see if we have any new local 2252 * addresses that need to get added to the peer (eg. addresses 2253 * changed while cookie echo in flight). This needs to be done 2254 * after we go to the OPEN state to do the correct asconf 2255 * processing. else, make sure we have the correct addresses in our 2256 * lists 2257 */ 2258 2259 /* warning, we re-use sin, sin6, sa_store here! */ 2260 /* pull in local_address (our "from" address) */ 2261 switch (cookie->laddr_type) { 2262#ifdef INET 2263 case SCTP_IPV4_ADDRESS: 2264 /* source addr is IPv4 */ 2265 sin = (struct sockaddr_in *)initack_src; 2266 memset(sin, 0, sizeof(*sin)); 2267 sin->sin_family = AF_INET; 2268 sin->sin_len = sizeof(struct sockaddr_in); 2269 sin->sin_addr.s_addr = cookie->laddress[0]; 2270 break; 2271#endif 2272#ifdef INET6 2273 case SCTP_IPV6_ADDRESS: 2274 /* source addr is IPv6 */ 2275 sin6 = (struct sockaddr_in6 *)initack_src; 2276 memset(sin6, 0, sizeof(*sin6)); 2277 sin6->sin6_family = AF_INET6; 2278 sin6->sin6_len = sizeof(struct sockaddr_in6); 2279 sin6->sin6_scope_id = cookie->scope_id; 2280 memcpy(&sin6->sin6_addr, cookie->laddress, 2281 sizeof(sin6->sin6_addr)); 2282 break; 2283#endif 2284 default: 2285 atomic_add_int(&stcb->asoc.refcnt, 1); 2286#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2287 SCTP_TCB_UNLOCK(stcb); 2288 SCTP_SOCKET_LOCK(so, 1); 2289 SCTP_TCB_LOCK(stcb); 2290#endif 2291 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2292#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2293 SCTP_SOCKET_UNLOCK(so, 1); 2294#endif 2295 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2296 return (NULL); 2297 } 2298 2299 /* set up to notify upper layer */ 2300 *notification = SCTP_NOTIFY_ASSOC_UP; 2301 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2302 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2303 (inp->sctp_socket->so_qlimit == 0)) { 2304 /* 2305 * This is an endpoint that called connect() how it got a 2306 * cookie that is NEW is a bit of a mystery. It must be that 2307 * the INIT was sent, but before it got there.. a complete 2308 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2309 * should have went to the other code.. not here.. oh well.. 2310 * a bit of protection is worth having.. 2311 */ 2312 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2313#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2314 atomic_add_int(&stcb->asoc.refcnt, 1); 2315 SCTP_TCB_UNLOCK(stcb); 2316 SCTP_SOCKET_LOCK(so, 1); 2317 SCTP_TCB_LOCK(stcb); 2318 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2319 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2320 SCTP_SOCKET_UNLOCK(so, 1); 2321 return (NULL); 2322 } 2323#endif 2324 soisconnected(stcb->sctp_socket); 2325#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2326 SCTP_SOCKET_UNLOCK(so, 1); 2327#endif 2328 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2329 (inp->sctp_socket->so_qlimit)) { 2330 /* 2331 * We don't want to do anything with this one. Since it is 2332 * the listening guy. The timer will get started for 2333 * accepted connections in the caller. 2334 */ 2335 ; 2336 } 2337 /* since we did not send a HB make sure we don't double things */ 2338 if ((netp) && (*netp)) 2339 (*netp)->hb_responded = 1; 2340 2341 if (stcb->asoc.sctp_autoclose_ticks && 2342 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2343 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2344 } 2345 /* calculate the RTT */ 2346 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2347 if ((netp) && (*netp)) { 2348 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2349 &cookie->time_entered, sctp_align_unsafe_makecopy, 2350 SCTP_RTT_FROM_NON_DATA); 2351 } 2352 /* respond with a COOKIE-ACK */ 2353 sctp_send_cookie_ack(stcb); 2354 2355 /* 2356 * check the address lists for any ASCONFs that need to be sent 2357 * AFTER the cookie-ack is sent 2358 */ 2359 sctp_check_address_list(stcb, m, 2360 initack_offset + sizeof(struct sctp_init_ack_chunk), 2361 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2362 initack_src, cookie->local_scope, cookie->site_scope, 2363 cookie->ipv4_scope, cookie->loopback_scope); 2364 2365 2366 return (stcb); 2367} 2368 2369/* 2370 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2371 * we NEED to make sure we are not already using the vtag. If so we 2372 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2373 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2374 SCTP_BASE_INFO(hashasocmark))]; 2375 LIST_FOREACH(stcb, head, sctp_asocs) { 2376 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2377 -- SEND ABORT - TRY AGAIN -- 2378 } 2379 } 2380*/ 2381 2382/* 2383 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2384 * existing (non-NULL) TCB 2385 */ 2386static struct mbuf * 2387sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2388 struct sockaddr *src, struct sockaddr *dst, 2389 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2390 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2391 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2392 struct sctp_tcb **locked_tcb, 2393 uint8_t use_mflowid, uint32_t mflowid, 2394 uint32_t vrf_id, uint16_t port) 2395{ 2396 struct sctp_state_cookie *cookie; 2397 struct sctp_tcb *l_stcb = *stcb; 2398 struct sctp_inpcb *l_inp; 2399 struct sockaddr *to; 2400 struct sctp_pcb *ep; 2401 struct mbuf *m_sig; 2402 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2403 uint8_t *sig; 2404 uint8_t cookie_ok = 0; 2405 unsigned int sig_offset, cookie_offset; 2406 unsigned int cookie_len; 2407 struct timeval now; 2408 struct timeval time_expires; 2409 int notification = 0; 2410 struct sctp_nets *netl; 2411 int had_a_existing_tcb = 0; 2412 int send_int_conf = 0; 2413 2414#ifdef INET 2415 struct sockaddr_in sin; 2416 2417#endif 2418#ifdef INET6 2419 struct sockaddr_in6 sin6; 2420 2421#endif 2422 2423 SCTPDBG(SCTP_DEBUG_INPUT2, 2424 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2425 2426 if (inp_p == NULL) { 2427 return (NULL); 2428 } 2429 cookie = &cp->cookie; 2430 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2431 cookie_len = ntohs(cp->ch.chunk_length); 2432 2433 if ((cookie->peerport != sh->src_port) && 2434 (cookie->myport != sh->dest_port) && 2435 (cookie->my_vtag != sh->v_tag)) { 2436 /* 2437 * invalid ports or bad tag. Note that we always leave the 2438 * v_tag in the header in network order and when we stored 2439 * it in the my_vtag slot we also left it in network order. 2440 * This maintains the match even though it may be in the 2441 * opposite byte order of the machine :-> 2442 */ 2443 return (NULL); 2444 } 2445 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2446 sizeof(struct sctp_init_chunk) + 2447 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2448 /* cookie too small */ 2449 return (NULL); 2450 } 2451 /* 2452 * split off the signature into its own mbuf (since it should not be 2453 * calculated in the sctp_hmac_m() call). 2454 */ 2455 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2456 m_sig = m_split(m, sig_offset, M_DONTWAIT); 2457 if (m_sig == NULL) { 2458 /* out of memory or ?? */ 2459 return (NULL); 2460 } 2461#ifdef SCTP_MBUF_LOGGING 2462 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2463 struct mbuf *mat; 2464 2465 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2466 if (SCTP_BUF_IS_EXTENDED(mat)) { 2467 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2468 } 2469 } 2470 } 2471#endif 2472 2473 /* 2474 * compute the signature/digest for the cookie 2475 */ 2476 ep = &(*inp_p)->sctp_ep; 2477 l_inp = *inp_p; 2478 if (l_stcb) { 2479 SCTP_TCB_UNLOCK(l_stcb); 2480 } 2481 SCTP_INP_RLOCK(l_inp); 2482 if (l_stcb) { 2483 SCTP_TCB_LOCK(l_stcb); 2484 } 2485 /* which cookie is it? */ 2486 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2487 (ep->current_secret_number != ep->last_secret_number)) { 2488 /* it's the old cookie */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 } else { 2493 /* it's the current cookie */ 2494 (void)sctp_hmac_m(SCTP_HMAC, 2495 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2496 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2497 } 2498 /* get the signature */ 2499 SCTP_INP_RUNLOCK(l_inp); 2500 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2501 if (sig == NULL) { 2502 /* couldn't find signature */ 2503 sctp_m_freem(m_sig); 2504 return (NULL); 2505 } 2506 /* compare the received digest with the computed digest */ 2507 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2508 /* try the old cookie? */ 2509 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2510 (ep->current_secret_number != ep->last_secret_number)) { 2511 /* compute digest with old */ 2512 (void)sctp_hmac_m(SCTP_HMAC, 2513 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2514 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2515 /* compare */ 2516 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2517 cookie_ok = 1; 2518 } 2519 } else { 2520 cookie_ok = 1; 2521 } 2522 2523 /* 2524 * Now before we continue we must reconstruct our mbuf so that 2525 * normal processing of any other chunks will work. 2526 */ 2527 { 2528 struct mbuf *m_at; 2529 2530 m_at = m; 2531 while (SCTP_BUF_NEXT(m_at) != NULL) { 2532 m_at = SCTP_BUF_NEXT(m_at); 2533 } 2534 SCTP_BUF_NEXT(m_at) = m_sig; 2535 } 2536 2537 if (cookie_ok == 0) { 2538 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2539 SCTPDBG(SCTP_DEBUG_INPUT2, 2540 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2541 (uint32_t) offset, cookie_offset, sig_offset); 2542 return (NULL); 2543 } 2544 /* 2545 * check the cookie timestamps to be sure it's not stale 2546 */ 2547 (void)SCTP_GETTIME_TIMEVAL(&now); 2548 /* Expire time is in Ticks, so we convert to seconds */ 2549 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2550 time_expires.tv_usec = cookie->time_entered.tv_usec; 2551 /* 2552 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2553 * is undefined. 2554 */ 2555 if (timevalcmp(&now, &time_expires, >)) { 2556 /* cookie is stale! */ 2557 struct mbuf *op_err; 2558 struct sctp_stale_cookie_msg *scm; 2559 uint32_t tim; 2560 2561 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2562 0, M_DONTWAIT, 1, MT_DATA); 2563 if (op_err == NULL) { 2564 /* FOOBAR */ 2565 return (NULL); 2566 } 2567 /* Set the len */ 2568 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2569 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2570 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2571 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2572 (sizeof(uint32_t)))); 2573 /* seconds to usec */ 2574 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2575 /* add in usec */ 2576 if (tim == 0) 2577 tim = now.tv_usec - cookie->time_entered.tv_usec; 2578 scm->time_usec = htonl(tim); 2579 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2580 use_mflowid, mflowid, 2581 vrf_id, port); 2582 return (NULL); 2583 } 2584 /* 2585 * Now we must see with the lookup address if we have an existing 2586 * asoc. This will only happen if we were in the COOKIE-WAIT state 2587 * and a INIT collided with us and somewhere the peer sent the 2588 * cookie on another address besides the single address our assoc 2589 * had for him. In this case we will have one of the tie-tags set at 2590 * least AND the address field in the cookie can be used to look it 2591 * up. 2592 */ 2593 to = NULL; 2594 switch (cookie->addr_type) { 2595#ifdef INET6 2596 case SCTP_IPV6_ADDRESS: 2597 memset(&sin6, 0, sizeof(sin6)); 2598 sin6.sin6_family = AF_INET6; 2599 sin6.sin6_len = sizeof(sin6); 2600 sin6.sin6_port = sh->src_port; 2601 sin6.sin6_scope_id = cookie->scope_id; 2602 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2603 sizeof(sin6.sin6_addr.s6_addr)); 2604 to = (struct sockaddr *)&sin6; 2605 break; 2606#endif 2607#ifdef INET 2608 case SCTP_IPV4_ADDRESS: 2609 memset(&sin, 0, sizeof(sin)); 2610 sin.sin_family = AF_INET; 2611 sin.sin_len = sizeof(sin); 2612 sin.sin_port = sh->src_port; 2613 sin.sin_addr.s_addr = cookie->address[0]; 2614 to = (struct sockaddr *)&sin; 2615 break; 2616#endif 2617 default: 2618 /* This should not happen */ 2619 return (NULL); 2620 } 2621 if ((*stcb == NULL) && to) { 2622 /* Yep, lets check */ 2623 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2624 if (*stcb == NULL) { 2625 /* 2626 * We should have only got back the same inp. If we 2627 * got back a different ep we have a problem. The 2628 * original findep got back l_inp and now 2629 */ 2630 if (l_inp != *inp_p) { 2631 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2632 } 2633 } else { 2634 if (*locked_tcb == NULL) { 2635 /* 2636 * In this case we found the assoc only 2637 * after we locked the create lock. This 2638 * means we are in a colliding case and we 2639 * must make sure that we unlock the tcb if 2640 * its one of the cases where we throw away 2641 * the incoming packets. 2642 */ 2643 *locked_tcb = *stcb; 2644 2645 /* 2646 * We must also increment the inp ref count 2647 * since the ref_count flags was set when we 2648 * did not find the TCB, now we found it 2649 * which reduces the refcount.. we must 2650 * raise it back out to balance it all :-) 2651 */ 2652 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2653 if ((*stcb)->sctp_ep != l_inp) { 2654 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2655 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2656 } 2657 } 2658 } 2659 } 2660 if (to == NULL) { 2661 return (NULL); 2662 } 2663 cookie_len -= SCTP_SIGNATURE_SIZE; 2664 if (*stcb == NULL) { 2665 /* this is the "normal" case... get a new TCB */ 2666 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2667 cookie, cookie_len, *inp_p, 2668 netp, to, ¬ification, 2669 auth_skipped, auth_offset, auth_len, 2670 use_mflowid, mflowid, 2671 vrf_id, port); 2672 } else { 2673 /* this is abnormal... cookie-echo on existing TCB */ 2674 had_a_existing_tcb = 1; 2675 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2676 src, dst, sh, 2677 cookie, cookie_len, *inp_p, *stcb, netp, to, 2678 ¬ification, auth_skipped, auth_offset, auth_len, 2679 use_mflowid, mflowid, 2680 vrf_id, port); 2681 } 2682 2683 if (*stcb == NULL) { 2684 /* still no TCB... must be bad cookie-echo */ 2685 return (NULL); 2686 } 2687 if ((*netp != NULL) && (use_mflowid != 0)) { 2688 (*netp)->flowid = mflowid; 2689#ifdef INVARIANTS 2690 (*netp)->flowidset = 1; 2691#endif 2692 } 2693 /* 2694 * Ok, we built an association so confirm the address we sent the 2695 * INIT-ACK to. 2696 */ 2697 netl = sctp_findnet(*stcb, to); 2698 /* 2699 * This code should in theory NOT run but 2700 */ 2701 if (netl == NULL) { 2702 /* TSNH! Huh, why do I need to add this address here? */ 2703 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2704 return (NULL); 2705 } 2706 netl = sctp_findnet(*stcb, to); 2707 } 2708 if (netl) { 2709 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2710 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2711 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2712 netl); 2713 send_int_conf = 1; 2714 } 2715 } 2716 sctp_start_net_timers(*stcb); 2717 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2718 if (!had_a_existing_tcb || 2719 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2720 /* 2721 * If we have a NEW cookie or the connect never 2722 * reached the connected state during collision we 2723 * must do the TCP accept thing. 2724 */ 2725 struct socket *so, *oso; 2726 struct sctp_inpcb *inp; 2727 2728 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2729 /* 2730 * For a restart we will keep the same 2731 * socket, no need to do anything. I THINK!! 2732 */ 2733 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2734 if (send_int_conf) { 2735 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2736 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2737 } 2738 return (m); 2739 } 2740 oso = (*inp_p)->sctp_socket; 2741 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2742 SCTP_TCB_UNLOCK((*stcb)); 2743 CURVNET_SET(oso->so_vnet); 2744 so = sonewconn(oso, 0 2745 ); 2746 CURVNET_RESTORE(); 2747 SCTP_TCB_LOCK((*stcb)); 2748 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2749 2750 if (so == NULL) { 2751 struct mbuf *op_err; 2752 2753#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2754 struct socket *pcb_so; 2755 2756#endif 2757 /* Too many sockets */ 2758 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2759 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 2760 sctp_abort_association(*inp_p, NULL, m, iphlen, 2761 src, dst, sh, op_err, 2762 use_mflowid, mflowid, 2763 vrf_id, port); 2764#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2765 pcb_so = SCTP_INP_SO(*inp_p); 2766 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2767 SCTP_TCB_UNLOCK((*stcb)); 2768 SCTP_SOCKET_LOCK(pcb_so, 1); 2769 SCTP_TCB_LOCK((*stcb)); 2770 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2771#endif 2772 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2773#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2774 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2775#endif 2776 return (NULL); 2777 } 2778 inp = (struct sctp_inpcb *)so->so_pcb; 2779 SCTP_INP_INCR_REF(inp); 2780 /* 2781 * We add the unbound flag here so that if we get an 2782 * soabort() before we get the move_pcb done, we 2783 * will properly cleanup. 2784 */ 2785 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2786 SCTP_PCB_FLAGS_CONNECTED | 2787 SCTP_PCB_FLAGS_IN_TCPPOOL | 2788 SCTP_PCB_FLAGS_UNBOUND | 2789 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2790 SCTP_PCB_FLAGS_DONT_WAKE); 2791 inp->sctp_features = (*inp_p)->sctp_features; 2792 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2793 inp->sctp_socket = so; 2794 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2795 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2796 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2797 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2798 inp->sctp_context = (*inp_p)->sctp_context; 2799 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2800 inp->inp_starting_point_for_iterator = NULL; 2801 /* 2802 * copy in the authentication parameters from the 2803 * original endpoint 2804 */ 2805 if (inp->sctp_ep.local_hmacs) 2806 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2807 inp->sctp_ep.local_hmacs = 2808 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2809 if (inp->sctp_ep.local_auth_chunks) 2810 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2811 inp->sctp_ep.local_auth_chunks = 2812 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2813 2814 /* 2815 * Now we must move it from one hash table to 2816 * another and get the tcb in the right place. 2817 */ 2818 2819 /* 2820 * This is where the one-2-one socket is put into 2821 * the accept state waiting for the accept! 2822 */ 2823 if (*stcb) { 2824 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2825 } 2826 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2827 2828 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2829 SCTP_TCB_UNLOCK((*stcb)); 2830 2831 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2832 0); 2833 SCTP_TCB_LOCK((*stcb)); 2834 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2835 2836 2837 /* 2838 * now we must check to see if we were aborted while 2839 * the move was going on and the lock/unlock 2840 * happened. 2841 */ 2842 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2843 /* 2844 * yep it was, we leave the assoc attached 2845 * to the socket since the sctp_inpcb_free() 2846 * call will send an abort for us. 2847 */ 2848 SCTP_INP_DECR_REF(inp); 2849 return (NULL); 2850 } 2851 SCTP_INP_DECR_REF(inp); 2852 /* Switch over to the new guy */ 2853 *inp_p = inp; 2854 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2855 if (send_int_conf) { 2856 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2857 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2858 } 2859 /* 2860 * Pull it from the incomplete queue and wake the 2861 * guy 2862 */ 2863#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2864 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2865 SCTP_TCB_UNLOCK((*stcb)); 2866 SCTP_SOCKET_LOCK(so, 1); 2867#endif 2868 soisconnected(so); 2869#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2870 SCTP_TCB_LOCK((*stcb)); 2871 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2872 SCTP_SOCKET_UNLOCK(so, 1); 2873#endif 2874 return (m); 2875 } 2876 } 2877 if (notification) { 2878 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2879 } 2880 if (send_int_conf) { 2881 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2882 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2883 } 2884 return (m); 2885} 2886 2887static void 2888sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2889 struct sctp_tcb *stcb, struct sctp_nets *net) 2890{ 2891 /* cp must not be used, others call this without a c-ack :-) */ 2892 struct sctp_association *asoc; 2893 2894 SCTPDBG(SCTP_DEBUG_INPUT2, 2895 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2896 if (stcb == NULL) 2897 return; 2898 2899 asoc = &stcb->asoc; 2900 2901 sctp_stop_all_cookie_timers(stcb); 2902 /* process according to association state */ 2903 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2904 /* state change only needed when I am in right state */ 2905 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2906 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2907 sctp_start_net_timers(stcb); 2908 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2909 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2910 stcb->sctp_ep, stcb, asoc->primary_destination); 2911 2912 } 2913 /* update RTO */ 2914 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2915 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2916 if (asoc->overall_error_count == 0) { 2917 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2918 &asoc->time_entered, sctp_align_safe_nocopy, 2919 SCTP_RTT_FROM_NON_DATA); 2920 } 2921 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2922 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2923 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2924 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2925#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2926 struct socket *so; 2927 2928#endif 2929 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2930#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2931 so = SCTP_INP_SO(stcb->sctp_ep); 2932 atomic_add_int(&stcb->asoc.refcnt, 1); 2933 SCTP_TCB_UNLOCK(stcb); 2934 SCTP_SOCKET_LOCK(so, 1); 2935 SCTP_TCB_LOCK(stcb); 2936 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2937#endif 2938 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2939 soisconnected(stcb->sctp_socket); 2940 } 2941#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2942 SCTP_SOCKET_UNLOCK(so, 1); 2943#endif 2944 } 2945 /* 2946 * since we did not send a HB make sure we don't double 2947 * things 2948 */ 2949 net->hb_responded = 1; 2950 2951 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2952 /* 2953 * We don't need to do the asconf thing, nor hb or 2954 * autoclose if the socket is closed. 2955 */ 2956 goto closed_socket; 2957 } 2958 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2959 stcb, net); 2960 2961 2962 if (stcb->asoc.sctp_autoclose_ticks && 2963 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2964 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2965 stcb->sctp_ep, stcb, NULL); 2966 } 2967 /* 2968 * send ASCONF if parameters are pending and ASCONFs are 2969 * allowed (eg. addresses changed when init/cookie echo were 2970 * in flight) 2971 */ 2972 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2973 (stcb->asoc.peer_supports_asconf) && 2974 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2975#ifdef SCTP_TIMER_BASED_ASCONF 2976 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2977 stcb->sctp_ep, stcb, 2978 stcb->asoc.primary_destination); 2979#else 2980 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2981 SCTP_ADDR_NOT_LOCKED); 2982#endif 2983 } 2984 } 2985closed_socket: 2986 /* Toss the cookie if I can */ 2987 sctp_toss_old_cookies(stcb, asoc); 2988 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2989 /* Restart the timer if we have pending data */ 2990 struct sctp_tmit_chunk *chk; 2991 2992 chk = TAILQ_FIRST(&asoc->sent_queue); 2993 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2994 } 2995} 2996 2997static void 2998sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2999 struct sctp_tcb *stcb) 3000{ 3001 struct sctp_nets *net; 3002 struct sctp_tmit_chunk *lchk; 3003 struct sctp_ecne_chunk bkup; 3004 uint8_t override_bit; 3005 uint32_t tsn, window_data_tsn; 3006 int len; 3007 unsigned int pkt_cnt; 3008 3009 len = ntohs(cp->ch.chunk_length); 3010 if ((len != sizeof(struct sctp_ecne_chunk)) && 3011 (len != sizeof(struct old_sctp_ecne_chunk))) { 3012 return; 3013 } 3014 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3015 /* Its the old format */ 3016 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3017 bkup.num_pkts_since_cwr = htonl(1); 3018 cp = &bkup; 3019 } 3020 SCTP_STAT_INCR(sctps_recvecne); 3021 tsn = ntohl(cp->tsn); 3022 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3023 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3024 if (lchk == NULL) { 3025 window_data_tsn = stcb->asoc.sending_seq - 1; 3026 } else { 3027 window_data_tsn = lchk->rec.data.TSN_seq; 3028 } 3029 3030 /* Find where it was sent to if possible. */ 3031 net = NULL; 3032 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3033 if (lchk->rec.data.TSN_seq == tsn) { 3034 net = lchk->whoTo; 3035 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3036 break; 3037 } 3038 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3039 break; 3040 } 3041 } 3042 if (net == NULL) { 3043 /* 3044 * What to do. A previous send of a CWR was possibly lost. 3045 * See how old it is, we may have it marked on the actual 3046 * net. 3047 */ 3048 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3049 if (tsn == net->last_cwr_tsn) { 3050 /* Found him, send it off */ 3051 break; 3052 } 3053 } 3054 if (net == NULL) { 3055 /* 3056 * If we reach here, we need to send a special CWR 3057 * that says hey, we did this a long time ago and 3058 * you lost the response. 3059 */ 3060 net = TAILQ_FIRST(&stcb->asoc.nets); 3061 if (net == NULL) { 3062 /* TSNH */ 3063 return; 3064 } 3065 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3066 } else { 3067 override_bit = 0; 3068 } 3069 } else { 3070 override_bit = 0; 3071 } 3072 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3073 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3074 /* 3075 * JRS - Use the congestion control given in the pluggable 3076 * CC module 3077 */ 3078 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3079 /* 3080 * We reduce once every RTT. So we will only lower cwnd at 3081 * the next sending seq i.e. the window_data_tsn 3082 */ 3083 net->cwr_window_tsn = window_data_tsn; 3084 net->ecn_ce_pkt_cnt += pkt_cnt; 3085 net->lost_cnt = pkt_cnt; 3086 net->last_cwr_tsn = tsn; 3087 } else { 3088 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3089 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3090 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3091 /* 3092 * Another loss in the same window update how many 3093 * marks/packets lost we have had. 3094 */ 3095 int cnt = 1; 3096 3097 if (pkt_cnt > net->lost_cnt) { 3098 /* Should be the case */ 3099 cnt = (pkt_cnt - net->lost_cnt); 3100 net->ecn_ce_pkt_cnt += cnt; 3101 } 3102 net->lost_cnt = pkt_cnt; 3103 net->last_cwr_tsn = tsn; 3104 /* 3105 * Most CC functions will ignore this call, since we 3106 * are in-window yet of the initial CE the peer saw. 3107 */ 3108 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3109 } 3110 } 3111 /* 3112 * We always send a CWR this way if our previous one was lost our 3113 * peer will get an update, or if it is not time again to reduce we 3114 * still get the cwr to the peer. Note we set the override when we 3115 * could not find the TSN on the chunk or the destination network. 3116 */ 3117 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3118} 3119 3120static void 3121sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3122{ 3123 /* 3124 * Here we get a CWR from the peer. We must look in the outqueue and 3125 * make sure that we have a covered ECNE in teh control chunk part. 3126 * If so remove it. 3127 */ 3128 struct sctp_tmit_chunk *chk; 3129 struct sctp_ecne_chunk *ecne; 3130 int override; 3131 uint32_t cwr_tsn; 3132 3133 cwr_tsn = ntohl(cp->tsn); 3134 3135 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3136 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3137 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3138 continue; 3139 } 3140 if ((override == 0) && (chk->whoTo != net)) { 3141 /* Must be from the right src unless override is set */ 3142 continue; 3143 } 3144 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3145 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3146 /* this covers this ECNE, we can remove it */ 3147 stcb->asoc.ecn_echo_cnt_onq--; 3148 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3149 sctp_next); 3150 if (chk->data) { 3151 sctp_m_freem(chk->data); 3152 chk->data = NULL; 3153 } 3154 stcb->asoc.ctrl_queue_cnt--; 3155 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3156 if (override == 0) { 3157 break; 3158 } 3159 } 3160 } 3161} 3162 3163static void 3164sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3165 struct sctp_tcb *stcb, struct sctp_nets *net) 3166{ 3167 struct sctp_association *asoc; 3168 3169#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3170 struct socket *so; 3171 3172#endif 3173 3174 SCTPDBG(SCTP_DEBUG_INPUT2, 3175 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3176 if (stcb == NULL) 3177 return; 3178 3179 asoc = &stcb->asoc; 3180 /* process according to association state */ 3181 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3182 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3183 SCTPDBG(SCTP_DEBUG_INPUT2, 3184 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3185 SCTP_TCB_UNLOCK(stcb); 3186 return; 3187 } 3188 /* notify upper layer protocol */ 3189 if (stcb->sctp_socket) { 3190 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3191 /* are the queues empty? they should be */ 3192 if (!TAILQ_EMPTY(&asoc->send_queue) || 3193 !TAILQ_EMPTY(&asoc->sent_queue) || 3194 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3195 sctp_report_all_outbound(stcb, 0, 0, SCTP_SO_NOT_LOCKED); 3196 } 3197 } 3198 /* stop the timer */ 3199 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3200 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3201 /* free the TCB */ 3202 SCTPDBG(SCTP_DEBUG_INPUT2, 3203 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3204#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3205 so = SCTP_INP_SO(stcb->sctp_ep); 3206 atomic_add_int(&stcb->asoc.refcnt, 1); 3207 SCTP_TCB_UNLOCK(stcb); 3208 SCTP_SOCKET_LOCK(so, 1); 3209 SCTP_TCB_LOCK(stcb); 3210 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3211#endif 3212 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3213#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3214 SCTP_SOCKET_UNLOCK(so, 1); 3215#endif 3216 return; 3217} 3218 3219static int 3220process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3221 struct sctp_nets *net, uint8_t flg) 3222{ 3223 switch (desc->chunk_type) { 3224 case SCTP_DATA: 3225 /* find the tsn to resend (possibly */ 3226 { 3227 uint32_t tsn; 3228 struct sctp_tmit_chunk *tp1; 3229 3230 tsn = ntohl(desc->tsn_ifany); 3231 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3232 if (tp1->rec.data.TSN_seq == tsn) { 3233 /* found it */ 3234 break; 3235 } 3236 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3237 /* not found */ 3238 tp1 = NULL; 3239 break; 3240 } 3241 } 3242 if (tp1 == NULL) { 3243 /* 3244 * Do it the other way , aka without paying 3245 * attention to queue seq order. 3246 */ 3247 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3248 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3249 if (tp1->rec.data.TSN_seq == tsn) { 3250 /* found it */ 3251 break; 3252 } 3253 } 3254 } 3255 if (tp1 == NULL) { 3256 SCTP_STAT_INCR(sctps_pdrptsnnf); 3257 } 3258 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3259 uint8_t *ddp; 3260 3261 if (((flg & SCTP_BADCRC) == 0) && 3262 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3263 return (0); 3264 } 3265 if ((stcb->asoc.peers_rwnd == 0) && 3266 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3267 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3268 return (0); 3269 } 3270 if (stcb->asoc.peers_rwnd == 0 && 3271 (flg & SCTP_FROM_MIDDLE_BOX)) { 3272 SCTP_STAT_INCR(sctps_pdrpdizrw); 3273 return (0); 3274 } 3275 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3276 sizeof(struct sctp_data_chunk)); 3277 { 3278 unsigned int iii; 3279 3280 for (iii = 0; iii < sizeof(desc->data_bytes); 3281 iii++) { 3282 if (ddp[iii] != desc->data_bytes[iii]) { 3283 SCTP_STAT_INCR(sctps_pdrpbadd); 3284 return (-1); 3285 } 3286 } 3287 } 3288 3289 if (tp1->do_rtt) { 3290 /* 3291 * this guy had a RTO calculation 3292 * pending on it, cancel it 3293 */ 3294 if (tp1->whoTo->rto_needed == 0) { 3295 tp1->whoTo->rto_needed = 1; 3296 } 3297 tp1->do_rtt = 0; 3298 } 3299 SCTP_STAT_INCR(sctps_pdrpmark); 3300 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3301 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3302 /* 3303 * mark it as if we were doing a FR, since 3304 * we will be getting gap ack reports behind 3305 * the info from the router. 3306 */ 3307 tp1->rec.data.doing_fast_retransmit = 1; 3308 /* 3309 * mark the tsn with what sequences can 3310 * cause a new FR. 3311 */ 3312 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3313 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3314 } else { 3315 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3316 } 3317 3318 /* restart the timer */ 3319 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3320 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3321 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3322 stcb, tp1->whoTo); 3323 3324 /* fix counts and things */ 3325 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3326 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3327 tp1->whoTo->flight_size, 3328 tp1->book_size, 3329 (uintptr_t) stcb, 3330 tp1->rec.data.TSN_seq); 3331 } 3332 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3333 sctp_flight_size_decrease(tp1); 3334 sctp_total_flight_decrease(stcb, tp1); 3335 } 3336 tp1->sent = SCTP_DATAGRAM_RESEND; 3337 } { 3338 /* audit code */ 3339 unsigned int audit; 3340 3341 audit = 0; 3342 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3343 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3344 audit++; 3345 } 3346 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3347 sctp_next) { 3348 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3349 audit++; 3350 } 3351 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3352 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3353 audit, stcb->asoc.sent_queue_retran_cnt); 3354#ifndef SCTP_AUDITING_ENABLED 3355 stcb->asoc.sent_queue_retran_cnt = audit; 3356#endif 3357 } 3358 } 3359 } 3360 break; 3361 case SCTP_ASCONF: 3362 { 3363 struct sctp_tmit_chunk *asconf; 3364 3365 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3366 sctp_next) { 3367 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3368 break; 3369 } 3370 } 3371 if (asconf) { 3372 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3373 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3374 asconf->sent = SCTP_DATAGRAM_RESEND; 3375 asconf->snd_count--; 3376 } 3377 } 3378 break; 3379 case SCTP_INITIATION: 3380 /* resend the INIT */ 3381 stcb->asoc.dropped_special_cnt++; 3382 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3383 /* 3384 * If we can get it in, in a few attempts we do 3385 * this, otherwise we let the timer fire. 3386 */ 3387 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3388 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3389 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3390 } 3391 break; 3392 case SCTP_SELECTIVE_ACK: 3393 case SCTP_NR_SELECTIVE_ACK: 3394 /* resend the sack */ 3395 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3396 break; 3397 case SCTP_HEARTBEAT_REQUEST: 3398 /* resend a demand HB */ 3399 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3400 /* 3401 * Only retransmit if we KNOW we wont destroy the 3402 * tcb 3403 */ 3404 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3405 } 3406 break; 3407 case SCTP_SHUTDOWN: 3408 sctp_send_shutdown(stcb, net); 3409 break; 3410 case SCTP_SHUTDOWN_ACK: 3411 sctp_send_shutdown_ack(stcb, net); 3412 break; 3413 case SCTP_COOKIE_ECHO: 3414 { 3415 struct sctp_tmit_chunk *cookie; 3416 3417 cookie = NULL; 3418 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3419 sctp_next) { 3420 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3421 break; 3422 } 3423 } 3424 if (cookie) { 3425 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3426 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3427 cookie->sent = SCTP_DATAGRAM_RESEND; 3428 sctp_stop_all_cookie_timers(stcb); 3429 } 3430 } 3431 break; 3432 case SCTP_COOKIE_ACK: 3433 sctp_send_cookie_ack(stcb); 3434 break; 3435 case SCTP_ASCONF_ACK: 3436 /* resend last asconf ack */ 3437 sctp_send_asconf_ack(stcb); 3438 break; 3439 case SCTP_FORWARD_CUM_TSN: 3440 send_forward_tsn(stcb, &stcb->asoc); 3441 break; 3442 /* can't do anything with these */ 3443 case SCTP_PACKET_DROPPED: 3444 case SCTP_INITIATION_ACK: /* this should not happen */ 3445 case SCTP_HEARTBEAT_ACK: 3446 case SCTP_ABORT_ASSOCIATION: 3447 case SCTP_OPERATION_ERROR: 3448 case SCTP_SHUTDOWN_COMPLETE: 3449 case SCTP_ECN_ECHO: 3450 case SCTP_ECN_CWR: 3451 default: 3452 break; 3453 } 3454 return (0); 3455} 3456 3457void 3458sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3459{ 3460 uint32_t i; 3461 uint16_t temp; 3462 3463 /* 3464 * We set things to 0xffff since this is the last delivered sequence 3465 * and we will be sending in 0 after the reset. 3466 */ 3467 3468 if (number_entries) { 3469 for (i = 0; i < number_entries; i++) { 3470 temp = ntohs(list[i]); 3471 if (temp >= stcb->asoc.streamincnt) { 3472 continue; 3473 } 3474 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3475 } 3476 } else { 3477 list = NULL; 3478 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3479 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3480 } 3481 } 3482 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3483} 3484 3485static void 3486sctp_reset_out_streams(struct sctp_tcb *stcb, int number_entries, uint16_t * list) 3487{ 3488 int i; 3489 3490 if (number_entries == 0) { 3491 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3492 stcb->asoc.strmout[i].next_sequence_sent = 0; 3493 } 3494 } else if (number_entries) { 3495 for (i = 0; i < number_entries; i++) { 3496 uint16_t temp; 3497 3498 temp = ntohs(list[i]); 3499 if (temp >= stcb->asoc.streamoutcnt) { 3500 /* no such stream */ 3501 continue; 3502 } 3503 stcb->asoc.strmout[temp].next_sequence_sent = 0; 3504 } 3505 } 3506 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3507} 3508 3509 3510struct sctp_stream_reset_out_request * 3511sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3512{ 3513 struct sctp_association *asoc; 3514 struct sctp_chunkhdr *ch; 3515 struct sctp_stream_reset_out_request *r; 3516 struct sctp_tmit_chunk *chk; 3517 int len, clen; 3518 3519 asoc = &stcb->asoc; 3520 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3521 asoc->stream_reset_outstanding = 0; 3522 return (NULL); 3523 } 3524 if (stcb->asoc.str_reset == NULL) { 3525 asoc->stream_reset_outstanding = 0; 3526 return (NULL); 3527 } 3528 chk = stcb->asoc.str_reset; 3529 if (chk->data == NULL) { 3530 return (NULL); 3531 } 3532 if (bchk) { 3533 /* he wants a copy of the chk pointer */ 3534 *bchk = chk; 3535 } 3536 clen = chk->send_size; 3537 ch = mtod(chk->data, struct sctp_chunkhdr *); 3538 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3539 if (ntohl(r->request_seq) == seq) { 3540 /* found it */ 3541 return (r); 3542 } 3543 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3544 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3545 /* move to the next one, there can only be a max of two */ 3546 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3547 if (ntohl(r->request_seq) == seq) { 3548 return (r); 3549 } 3550 } 3551 /* that seq is not here */ 3552 return (NULL); 3553} 3554 3555static void 3556sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3557{ 3558 struct sctp_association *asoc; 3559 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3560 3561 if (stcb->asoc.str_reset == NULL) { 3562 return; 3563 } 3564 asoc = &stcb->asoc; 3565 3566 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3567 TAILQ_REMOVE(&asoc->control_send_queue, 3568 chk, 3569 sctp_next); 3570 if (chk->data) { 3571 sctp_m_freem(chk->data); 3572 chk->data = NULL; 3573 } 3574 asoc->ctrl_queue_cnt--; 3575 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3576 /* sa_ignore NO_NULL_CHK */ 3577 stcb->asoc.str_reset = NULL; 3578} 3579 3580 3581static int 3582sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3583 uint32_t seq, uint32_t action, 3584 struct sctp_stream_reset_response *respin) 3585{ 3586 uint16_t type; 3587 int lparm_len; 3588 struct sctp_association *asoc = &stcb->asoc; 3589 struct sctp_tmit_chunk *chk; 3590 struct sctp_stream_reset_out_request *srparam; 3591 int number_entries; 3592 3593 if (asoc->stream_reset_outstanding == 0) { 3594 /* duplicate */ 3595 return (0); 3596 } 3597 if (seq == stcb->asoc.str_reset_seq_out) { 3598 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3599 if (srparam) { 3600 stcb->asoc.str_reset_seq_out++; 3601 type = ntohs(srparam->ph.param_type); 3602 lparm_len = ntohs(srparam->ph.param_length); 3603 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3604 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3605 asoc->stream_reset_out_is_outstanding = 0; 3606 if (asoc->stream_reset_outstanding) 3607 asoc->stream_reset_outstanding--; 3608 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3609 /* do it */ 3610 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3611 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3612 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3613 } else { 3614 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3615 } 3616 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3617 /* Answered my request */ 3618 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3619 if (asoc->stream_reset_outstanding) 3620 asoc->stream_reset_outstanding--; 3621 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3622 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3623 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3624 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3625 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3626 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3627 } 3628 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3629 /* Ok we now may have more streams */ 3630 int num_stream; 3631 3632 num_stream = stcb->asoc.strm_pending_add_size; 3633 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3634 /* TSNH */ 3635 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3636 } 3637 stcb->asoc.strm_pending_add_size = 0; 3638 if (asoc->stream_reset_outstanding) 3639 asoc->stream_reset_outstanding--; 3640 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3641 /* Put the new streams into effect */ 3642 stcb->asoc.streamoutcnt += num_stream; 3643 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3644 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3645 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3646 SCTP_STREAM_CHANGE_DENIED); 3647 } else { 3648 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3649 SCTP_STREAM_CHANGE_FAILED); 3650 } 3651 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3652 if (asoc->stream_reset_outstanding) 3653 asoc->stream_reset_outstanding--; 3654 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3655 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3656 SCTP_STREAM_CHANGE_DENIED); 3657 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3658 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3659 SCTP_STREAM_CHANGE_FAILED); 3660 } 3661 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3662 /** 3663 * a) Adopt the new in tsn. 3664 * b) reset the map 3665 * c) Adopt the new out-tsn 3666 */ 3667 struct sctp_stream_reset_response_tsn *resp; 3668 struct sctp_forward_tsn_chunk fwdtsn; 3669 int abort_flag = 0; 3670 3671 if (respin == NULL) { 3672 /* huh ? */ 3673 return (0); 3674 } 3675 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3676 resp = (struct sctp_stream_reset_response_tsn *)respin; 3677 asoc->stream_reset_outstanding--; 3678 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3679 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3680 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3681 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3682 if (abort_flag) { 3683 return (1); 3684 } 3685 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3686 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3687 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3688 } 3689 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3690 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3691 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3692 3693 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3694 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3695 3696 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3697 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3698 3699 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3700 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3701 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3702 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3703 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3704 SCTP_ASSOC_RESET_DENIED); 3705 } else { 3706 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3707 SCTP_ASSOC_RESET_FAILED); 3708 } 3709 } 3710 /* get rid of the request and get the request flags */ 3711 if (asoc->stream_reset_outstanding == 0) { 3712 sctp_clean_up_stream_reset(stcb); 3713 } 3714 } 3715 } 3716 return (0); 3717} 3718 3719static void 3720sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3721 struct sctp_tmit_chunk *chk, 3722 struct sctp_stream_reset_in_request *req, int trunc) 3723{ 3724 uint32_t seq; 3725 int len, i; 3726 int number_entries; 3727 uint16_t temp; 3728 3729 /* 3730 * peer wants me to send a str-reset to him for my outgoing seq's if 3731 * seq_in is right. 3732 */ 3733 struct sctp_association *asoc = &stcb->asoc; 3734 3735 seq = ntohl(req->request_seq); 3736 if (asoc->str_reset_seq_in == seq) { 3737 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3738 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3739 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3740 } else if (trunc) { 3741 /* Can't do it, since they exceeded our buffer size */ 3742 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3743 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3744 len = ntohs(req->ph.param_length); 3745 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3746 for (i = 0; i < number_entries; i++) { 3747 temp = ntohs(req->list_of_streams[i]); 3748 req->list_of_streams[i] = temp; 3749 } 3750 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3751 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3752 asoc->str_reset_seq_out, 3753 seq, (asoc->sending_seq - 1)); 3754 asoc->stream_reset_out_is_outstanding = 1; 3755 asoc->str_reset = chk; 3756 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3757 stcb->asoc.stream_reset_outstanding++; 3758 } else { 3759 /* Can't do it, since we have sent one out */ 3760 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3761 } 3762 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3763 asoc->str_reset_seq_in++; 3764 } else if (asoc->str_reset_seq_in - 1 == seq) { 3765 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3766 } else if (asoc->str_reset_seq_in - 2 == seq) { 3767 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3768 } else { 3769 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3770 } 3771} 3772 3773static int 3774sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3775 struct sctp_tmit_chunk *chk, 3776 struct sctp_stream_reset_tsn_request *req) 3777{ 3778 /* reset all in and out and update the tsn */ 3779 /* 3780 * A) reset my str-seq's on in and out. B) Select a receive next, 3781 * and set cum-ack to it. Also process this selected number as a 3782 * fwd-tsn as well. C) set in the response my next sending seq. 3783 */ 3784 struct sctp_forward_tsn_chunk fwdtsn; 3785 struct sctp_association *asoc = &stcb->asoc; 3786 int abort_flag = 0; 3787 uint32_t seq; 3788 3789 seq = ntohl(req->request_seq); 3790 if (asoc->str_reset_seq_in == seq) { 3791 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3792 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3793 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3794 } else { 3795 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3796 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3797 fwdtsn.ch.chunk_flags = 0; 3798 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3799 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3800 if (abort_flag) { 3801 return (1); 3802 } 3803 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3804 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3805 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3806 } 3807 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3808 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3809 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3810 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3811 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3812 atomic_add_int(&asoc->sending_seq, 1); 3813 /* save off historical data for retrans */ 3814 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3815 asoc->last_sending_seq[0] = asoc->sending_seq; 3816 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3817 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3818 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3819 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3820 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3821 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3822 } 3823 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3824 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3825 asoc->str_reset_seq_in++; 3826 } else if (asoc->str_reset_seq_in - 1 == seq) { 3827 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3828 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3829 } else if (asoc->str_reset_seq_in - 2 == seq) { 3830 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3831 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3832 } else { 3833 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3834 } 3835 return (0); 3836} 3837 3838static void 3839sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3840 struct sctp_tmit_chunk *chk, 3841 struct sctp_stream_reset_out_request *req, int trunc) 3842{ 3843 uint32_t seq, tsn; 3844 int number_entries, len; 3845 struct sctp_association *asoc = &stcb->asoc; 3846 3847 seq = ntohl(req->request_seq); 3848 3849 /* now if its not a duplicate we process it */ 3850 if (asoc->str_reset_seq_in == seq) { 3851 len = ntohs(req->ph.param_length); 3852 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3853 /* 3854 * the sender is resetting, handle the list issue.. we must 3855 * a) verify if we can do the reset, if so no problem b) If 3856 * we can't do the reset we must copy the request. c) queue 3857 * it, and setup the data in processor to trigger it off 3858 * when needed and dequeue all the queued data. 3859 */ 3860 tsn = ntohl(req->send_reset_at_tsn); 3861 3862 /* move the reset action back one */ 3863 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3864 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3865 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3866 } else if (trunc) { 3867 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3868 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3869 /* we can do it now */ 3870 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3872 } else { 3873 /* 3874 * we must queue it up and thus wait for the TSN's 3875 * to arrive that are at or before tsn 3876 */ 3877 struct sctp_stream_reset_list *liste; 3878 int siz; 3879 3880 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3881 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3882 siz, SCTP_M_STRESET); 3883 if (liste == NULL) { 3884 /* gak out of memory */ 3885 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3886 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3887 return; 3888 } 3889 liste->tsn = tsn; 3890 liste->number_entries = number_entries; 3891 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3892 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3893 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3894 } 3895 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3896 asoc->str_reset_seq_in++; 3897 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3898 /* 3899 * one seq back, just echo back last action since my 3900 * response was lost. 3901 */ 3902 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3903 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3904 /* 3905 * two seq back, just echo back last action since my 3906 * response was lost. 3907 */ 3908 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3909 } else { 3910 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3911 } 3912} 3913 3914static void 3915sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3916 struct sctp_stream_reset_add_strm *str_add) 3917{ 3918 /* 3919 * Peer is requesting to add more streams. If its within our 3920 * max-streams we will allow it. 3921 */ 3922 uint32_t num_stream, i; 3923 uint32_t seq; 3924 struct sctp_association *asoc = &stcb->asoc; 3925 struct sctp_queued_to_read *ctl, *nctl; 3926 3927 /* Get the number. */ 3928 seq = ntohl(str_add->request_seq); 3929 num_stream = ntohs(str_add->number_of_streams); 3930 /* Now what would be the new total? */ 3931 if (asoc->str_reset_seq_in == seq) { 3932 num_stream += stcb->asoc.streamincnt; 3933 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3934 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3935 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3936 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3937 (num_stream > 0xffff)) { 3938 /* We must reject it they ask for to many */ 3939 denied: 3940 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3941 } else { 3942 /* Ok, we can do that :-) */ 3943 struct sctp_stream_in *oldstrm; 3944 3945 /* save off the old */ 3946 oldstrm = stcb->asoc.strmin; 3947 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3948 (num_stream * sizeof(struct sctp_stream_in)), 3949 SCTP_M_STRMI); 3950 if (stcb->asoc.strmin == NULL) { 3951 stcb->asoc.strmin = oldstrm; 3952 goto denied; 3953 } 3954 /* copy off the old data */ 3955 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3956 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3957 stcb->asoc.strmin[i].stream_no = i; 3958 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3959 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3960 /* now anything on those queues? */ 3961 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3962 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3963 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3964 } 3965 } 3966 /* Init the new streams */ 3967 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3968 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3969 stcb->asoc.strmin[i].stream_no = i; 3970 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3971 stcb->asoc.strmin[i].delivery_started = 0; 3972 } 3973 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3974 /* update the size */ 3975 stcb->asoc.streamincnt = num_stream; 3976 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3977 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3978 } 3979 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3980 asoc->str_reset_seq_in++; 3981 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3982 /* 3983 * one seq back, just echo back last action since my 3984 * response was lost. 3985 */ 3986 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3987 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3988 /* 3989 * two seq back, just echo back last action since my 3990 * response was lost. 3991 */ 3992 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3993 } else { 3994 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3995 3996 } 3997} 3998 3999static void 4000sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4001 struct sctp_stream_reset_add_strm *str_add) 4002{ 4003 /* 4004 * Peer is requesting to add more streams. If its within our 4005 * max-streams we will allow it. 4006 */ 4007 uint16_t num_stream; 4008 uint32_t seq; 4009 struct sctp_association *asoc = &stcb->asoc; 4010 4011 /* Get the number. */ 4012 seq = ntohl(str_add->request_seq); 4013 num_stream = ntohs(str_add->number_of_streams); 4014 /* Now what would be the new total? */ 4015 if (asoc->str_reset_seq_in == seq) { 4016 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4017 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4018 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4019 } else if (stcb->asoc.stream_reset_outstanding) { 4020 /* We must reject it we have something pending */ 4021 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4022 } else { 4023 /* Ok, we can do that :-) */ 4024 int mychk; 4025 4026 mychk = stcb->asoc.streamoutcnt; 4027 mychk += num_stream; 4028 if (mychk < 0x10000) { 4029 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4030 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4031 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4032 } 4033 } else { 4034 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4035 } 4036 } 4037 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4038 asoc->str_reset_seq_in++; 4039 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4040 /* 4041 * one seq back, just echo back last action since my 4042 * response was lost. 4043 */ 4044 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4045 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4046 /* 4047 * two seq back, just echo back last action since my 4048 * response was lost. 4049 */ 4050 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4051 } else { 4052 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4053 } 4054} 4055 4056#ifdef __GNUC__ 4057__attribute__((noinline)) 4058#endif 4059 static int 4060 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4061 struct sctp_chunkhdr *ch_req) 4062{ 4063 int chk_length, param_len, ptype; 4064 struct sctp_paramhdr pstore; 4065 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4066 uint32_t seq = 0; 4067 int num_req = 0; 4068 int trunc = 0; 4069 struct sctp_tmit_chunk *chk; 4070 struct sctp_chunkhdr *ch; 4071 struct sctp_paramhdr *ph; 4072 int ret_code = 0; 4073 int num_param = 0; 4074 4075 /* now it may be a reset or a reset-response */ 4076 chk_length = ntohs(ch_req->chunk_length); 4077 4078 /* setup for adding the response */ 4079 sctp_alloc_a_chunk(stcb, chk); 4080 if (chk == NULL) { 4081 return (ret_code); 4082 } 4083 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4084 chk->rec.chunk_id.can_take_data = 0; 4085 chk->asoc = &stcb->asoc; 4086 chk->no_fr_allowed = 0; 4087 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4088 chk->book_size_scale = 0; 4089 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_DONTWAIT, 1, MT_DATA); 4090 if (chk->data == NULL) { 4091strres_nochunk: 4092 if (chk->data) { 4093 sctp_m_freem(chk->data); 4094 chk->data = NULL; 4095 } 4096 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4097 return (ret_code); 4098 } 4099 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4100 4101 /* setup chunk parameters */ 4102 chk->sent = SCTP_DATAGRAM_UNSENT; 4103 chk->snd_count = 0; 4104 chk->whoTo = NULL; 4105 4106 ch = mtod(chk->data, struct sctp_chunkhdr *); 4107 ch->chunk_type = SCTP_STREAM_RESET; 4108 ch->chunk_flags = 0; 4109 ch->chunk_length = htons(chk->send_size); 4110 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4111 offset += sizeof(struct sctp_chunkhdr); 4112 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4113 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4114 if (ph == NULL) 4115 break; 4116 param_len = ntohs(ph->param_length); 4117 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4118 /* bad param */ 4119 break; 4120 } 4121 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4122 (uint8_t *) & cstore); 4123 ptype = ntohs(ph->param_type); 4124 num_param++; 4125 if (param_len > (int)sizeof(cstore)) { 4126 trunc = 1; 4127 } else { 4128 trunc = 0; 4129 } 4130 if (num_param > SCTP_MAX_RESET_PARAMS) { 4131 /* hit the max of parameters already sorry.. */ 4132 break; 4133 } 4134 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4135 struct sctp_stream_reset_out_request *req_out; 4136 4137 req_out = (struct sctp_stream_reset_out_request *)ph; 4138 num_req++; 4139 if (stcb->asoc.stream_reset_outstanding) { 4140 seq = ntohl(req_out->response_seq); 4141 if (seq == stcb->asoc.str_reset_seq_out) { 4142 /* implicit ack */ 4143 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4144 } 4145 } 4146 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4147 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4148 struct sctp_stream_reset_add_strm *str_add; 4149 4150 str_add = (struct sctp_stream_reset_add_strm *)ph; 4151 num_req++; 4152 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4153 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4154 struct sctp_stream_reset_add_strm *str_add; 4155 4156 str_add = (struct sctp_stream_reset_add_strm *)ph; 4157 num_req++; 4158 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4159 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4160 struct sctp_stream_reset_in_request *req_in; 4161 4162 num_req++; 4163 req_in = (struct sctp_stream_reset_in_request *)ph; 4164 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4165 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4166 struct sctp_stream_reset_tsn_request *req_tsn; 4167 4168 num_req++; 4169 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4170 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4171 ret_code = 1; 4172 goto strres_nochunk; 4173 } 4174 /* no more */ 4175 break; 4176 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4177 struct sctp_stream_reset_response *resp; 4178 uint32_t result; 4179 4180 resp = (struct sctp_stream_reset_response *)ph; 4181 seq = ntohl(resp->response_seq); 4182 result = ntohl(resp->result); 4183 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4184 ret_code = 1; 4185 goto strres_nochunk; 4186 } 4187 } else { 4188 break; 4189 } 4190 offset += SCTP_SIZE32(param_len); 4191 chk_length -= SCTP_SIZE32(param_len); 4192 } 4193 if (num_req == 0) { 4194 /* we have no response free the stuff */ 4195 goto strres_nochunk; 4196 } 4197 /* ok we have a chunk to link in */ 4198 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4199 chk, 4200 sctp_next); 4201 stcb->asoc.ctrl_queue_cnt++; 4202 return (ret_code); 4203} 4204 4205/* 4206 * Handle a router or endpoints report of a packet loss, there are two ways 4207 * to handle this, either we get the whole packet and must disect it 4208 * ourselves (possibly with truncation and or corruption) or it is a summary 4209 * from a middle box that did the disectting for us. 4210 */ 4211static void 4212sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4213 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4214{ 4215 uint32_t bottle_bw, on_queue; 4216 uint16_t trunc_len; 4217 unsigned int chlen; 4218 unsigned int at; 4219 struct sctp_chunk_desc desc; 4220 struct sctp_chunkhdr *ch; 4221 4222 chlen = ntohs(cp->ch.chunk_length); 4223 chlen -= sizeof(struct sctp_pktdrop_chunk); 4224 /* XXX possible chlen underflow */ 4225 if (chlen == 0) { 4226 ch = NULL; 4227 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4228 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4229 } else { 4230 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4231 chlen -= sizeof(struct sctphdr); 4232 /* XXX possible chlen underflow */ 4233 memset(&desc, 0, sizeof(desc)); 4234 } 4235 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4236 if (trunc_len > limit) { 4237 trunc_len = limit; 4238 } 4239 /* now the chunks themselves */ 4240 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4241 desc.chunk_type = ch->chunk_type; 4242 /* get amount we need to move */ 4243 at = ntohs(ch->chunk_length); 4244 if (at < sizeof(struct sctp_chunkhdr)) { 4245 /* corrupt chunk, maybe at the end? */ 4246 SCTP_STAT_INCR(sctps_pdrpcrupt); 4247 break; 4248 } 4249 if (trunc_len == 0) { 4250 /* we are supposed to have all of it */ 4251 if (at > chlen) { 4252 /* corrupt skip it */ 4253 SCTP_STAT_INCR(sctps_pdrpcrupt); 4254 break; 4255 } 4256 } else { 4257 /* is there enough of it left ? */ 4258 if (desc.chunk_type == SCTP_DATA) { 4259 if (chlen < (sizeof(struct sctp_data_chunk) + 4260 sizeof(desc.data_bytes))) { 4261 break; 4262 } 4263 } else { 4264 if (chlen < sizeof(struct sctp_chunkhdr)) { 4265 break; 4266 } 4267 } 4268 } 4269 if (desc.chunk_type == SCTP_DATA) { 4270 /* can we get out the tsn? */ 4271 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4272 SCTP_STAT_INCR(sctps_pdrpmbda); 4273 4274 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4275 /* yep */ 4276 struct sctp_data_chunk *dcp; 4277 uint8_t *ddp; 4278 unsigned int iii; 4279 4280 dcp = (struct sctp_data_chunk *)ch; 4281 ddp = (uint8_t *) (dcp + 1); 4282 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4283 desc.data_bytes[iii] = ddp[iii]; 4284 } 4285 desc.tsn_ifany = dcp->dp.tsn; 4286 } else { 4287 /* nope we are done. */ 4288 SCTP_STAT_INCR(sctps_pdrpnedat); 4289 break; 4290 } 4291 } else { 4292 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4293 SCTP_STAT_INCR(sctps_pdrpmbct); 4294 } 4295 4296 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4297 SCTP_STAT_INCR(sctps_pdrppdbrk); 4298 break; 4299 } 4300 if (SCTP_SIZE32(at) > chlen) { 4301 break; 4302 } 4303 chlen -= SCTP_SIZE32(at); 4304 if (chlen < sizeof(struct sctp_chunkhdr)) { 4305 /* done, none left */ 4306 break; 4307 } 4308 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4309 } 4310 /* Now update any rwnd --- possibly */ 4311 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4312 /* From a peer, we get a rwnd report */ 4313 uint32_t a_rwnd; 4314 4315 SCTP_STAT_INCR(sctps_pdrpfehos); 4316 4317 bottle_bw = ntohl(cp->bottle_bw); 4318 on_queue = ntohl(cp->current_onq); 4319 if (bottle_bw && on_queue) { 4320 /* a rwnd report is in here */ 4321 if (bottle_bw > on_queue) 4322 a_rwnd = bottle_bw - on_queue; 4323 else 4324 a_rwnd = 0; 4325 4326 if (a_rwnd == 0) 4327 stcb->asoc.peers_rwnd = 0; 4328 else { 4329 if (a_rwnd > stcb->asoc.total_flight) { 4330 stcb->asoc.peers_rwnd = 4331 a_rwnd - stcb->asoc.total_flight; 4332 } else { 4333 stcb->asoc.peers_rwnd = 0; 4334 } 4335 if (stcb->asoc.peers_rwnd < 4336 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4337 /* SWS sender side engages */ 4338 stcb->asoc.peers_rwnd = 0; 4339 } 4340 } 4341 } 4342 } else { 4343 SCTP_STAT_INCR(sctps_pdrpfmbox); 4344 } 4345 4346 /* now middle boxes in sat networks get a cwnd bump */ 4347 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4348 (stcb->asoc.sat_t3_loss_recovery == 0) && 4349 (stcb->asoc.sat_network)) { 4350 /* 4351 * This is debateable but for sat networks it makes sense 4352 * Note if a T3 timer has went off, we will prohibit any 4353 * changes to cwnd until we exit the t3 loss recovery. 4354 */ 4355 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4356 net, cp, &bottle_bw, &on_queue); 4357 } 4358} 4359 4360/* 4361 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4362 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4363 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4364 * length of the complete packet outputs: - length: modified to remaining 4365 * length after control processing - netp: modified to new sctp_nets after 4366 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4367 * bad packet,...) otherwise return the tcb for this packet 4368 */ 4369#ifdef __GNUC__ 4370__attribute__((noinline)) 4371#endif 4372 static struct sctp_tcb * 4373 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4374 struct sockaddr *src, struct sockaddr *dst, 4375 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4376 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4377 uint8_t use_mflowid, uint32_t mflowid, 4378 uint32_t vrf_id, uint16_t port) 4379{ 4380 struct sctp_association *asoc; 4381 uint32_t vtag_in; 4382 int num_chunks = 0; /* number of control chunks processed */ 4383 uint32_t chk_length; 4384 int ret; 4385 int abort_no_unlock = 0; 4386 int ecne_seen = 0; 4387 4388 /* 4389 * How big should this be, and should it be alloc'd? Lets try the 4390 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4391 * until we get into jumbo grams and such.. 4392 */ 4393 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4394 struct sctp_tcb *locked_tcb = stcb; 4395 int got_auth = 0; 4396 uint32_t auth_offset = 0, auth_len = 0; 4397 int auth_skipped = 0; 4398 int asconf_cnt = 0; 4399 4400#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4401 struct socket *so; 4402 4403#endif 4404 4405 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4406 iphlen, *offset, length, (void *)stcb); 4407 4408 /* validate chunk header length... */ 4409 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4410 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4411 ntohs(ch->chunk_length)); 4412 if (locked_tcb) { 4413 SCTP_TCB_UNLOCK(locked_tcb); 4414 } 4415 return (NULL); 4416 } 4417 /* 4418 * validate the verification tag 4419 */ 4420 vtag_in = ntohl(sh->v_tag); 4421 4422 if (locked_tcb) { 4423 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4424 } 4425 if (ch->chunk_type == SCTP_INITIATION) { 4426 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4427 ntohs(ch->chunk_length), vtag_in); 4428 if (vtag_in != 0) { 4429 /* protocol error- silently discard... */ 4430 SCTP_STAT_INCR(sctps_badvtag); 4431 if (locked_tcb) { 4432 SCTP_TCB_UNLOCK(locked_tcb); 4433 } 4434 return (NULL); 4435 } 4436 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4437 /* 4438 * If there is no stcb, skip the AUTH chunk and process 4439 * later after a stcb is found (to validate the lookup was 4440 * valid. 4441 */ 4442 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4443 (stcb == NULL) && 4444 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4445 /* save this chunk for later processing */ 4446 auth_skipped = 1; 4447 auth_offset = *offset; 4448 auth_len = ntohs(ch->chunk_length); 4449 4450 /* (temporarily) move past this chunk */ 4451 *offset += SCTP_SIZE32(auth_len); 4452 if (*offset >= length) { 4453 /* no more data left in the mbuf chain */ 4454 *offset = length; 4455 if (locked_tcb) { 4456 SCTP_TCB_UNLOCK(locked_tcb); 4457 } 4458 return (NULL); 4459 } 4460 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4461 sizeof(struct sctp_chunkhdr), chunk_buf); 4462 } 4463 if (ch == NULL) { 4464 /* Help */ 4465 *offset = length; 4466 if (locked_tcb) { 4467 SCTP_TCB_UNLOCK(locked_tcb); 4468 } 4469 return (NULL); 4470 } 4471 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4472 goto process_control_chunks; 4473 } 4474 /* 4475 * first check if it's an ASCONF with an unknown src addr we 4476 * need to look inside to find the association 4477 */ 4478 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4479 struct sctp_chunkhdr *asconf_ch = ch; 4480 uint32_t asconf_offset = 0, asconf_len = 0; 4481 4482 /* inp's refcount may be reduced */ 4483 SCTP_INP_INCR_REF(inp); 4484 4485 asconf_offset = *offset; 4486 do { 4487 asconf_len = ntohs(asconf_ch->chunk_length); 4488 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4489 break; 4490 stcb = sctp_findassociation_ep_asconf(m, 4491 *offset, 4492 dst, 4493 sh, &inp, netp, vrf_id); 4494 if (stcb != NULL) 4495 break; 4496 asconf_offset += SCTP_SIZE32(asconf_len); 4497 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4498 sizeof(struct sctp_chunkhdr), chunk_buf); 4499 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4500 if (stcb == NULL) { 4501 /* 4502 * reduce inp's refcount if not reduced in 4503 * sctp_findassociation_ep_asconf(). 4504 */ 4505 SCTP_INP_DECR_REF(inp); 4506 } else { 4507 locked_tcb = stcb; 4508 } 4509 4510 /* now go back and verify any auth chunk to be sure */ 4511 if (auth_skipped && (stcb != NULL)) { 4512 struct sctp_auth_chunk *auth; 4513 4514 auth = (struct sctp_auth_chunk *) 4515 sctp_m_getptr(m, auth_offset, 4516 auth_len, chunk_buf); 4517 got_auth = 1; 4518 auth_skipped = 0; 4519 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4520 auth_offset)) { 4521 /* auth HMAC failed so dump it */ 4522 *offset = length; 4523 if (locked_tcb) { 4524 SCTP_TCB_UNLOCK(locked_tcb); 4525 } 4526 return (NULL); 4527 } else { 4528 /* remaining chunks are HMAC checked */ 4529 stcb->asoc.authenticated = 1; 4530 } 4531 } 4532 } 4533 if (stcb == NULL) { 4534 /* no association, so it's out of the blue... */ 4535 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, 4536 use_mflowid, mflowid, 4537 vrf_id, port); 4538 *offset = length; 4539 if (locked_tcb) { 4540 SCTP_TCB_UNLOCK(locked_tcb); 4541 } 4542 return (NULL); 4543 } 4544 asoc = &stcb->asoc; 4545 /* ABORT and SHUTDOWN can use either v_tag... */ 4546 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4547 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4548 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4549 if ((vtag_in == asoc->my_vtag) || 4550 ((ch->chunk_flags & SCTP_HAD_NO_TCB) && 4551 (vtag_in == asoc->peer_vtag))) { 4552 /* this is valid */ 4553 } else { 4554 /* drop this packet... */ 4555 SCTP_STAT_INCR(sctps_badvtag); 4556 if (locked_tcb) { 4557 SCTP_TCB_UNLOCK(locked_tcb); 4558 } 4559 return (NULL); 4560 } 4561 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4562 if (vtag_in != asoc->my_vtag) { 4563 /* 4564 * this could be a stale SHUTDOWN-ACK or the 4565 * peer never got the SHUTDOWN-COMPLETE and 4566 * is still hung; we have started a new asoc 4567 * but it won't complete until the shutdown 4568 * is completed 4569 */ 4570 if (locked_tcb) { 4571 SCTP_TCB_UNLOCK(locked_tcb); 4572 } 4573 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4574 sh, inp, 4575 use_mflowid, mflowid, 4576 vrf_id, port); 4577 return (NULL); 4578 } 4579 } else { 4580 /* for all other chunks, vtag must match */ 4581 if (vtag_in != asoc->my_vtag) { 4582 /* invalid vtag... */ 4583 SCTPDBG(SCTP_DEBUG_INPUT3, 4584 "invalid vtag: %xh, expect %xh\n", 4585 vtag_in, asoc->my_vtag); 4586 SCTP_STAT_INCR(sctps_badvtag); 4587 if (locked_tcb) { 4588 SCTP_TCB_UNLOCK(locked_tcb); 4589 } 4590 *offset = length; 4591 return (NULL); 4592 } 4593 } 4594 } /* end if !SCTP_COOKIE_ECHO */ 4595 /* 4596 * process all control chunks... 4597 */ 4598 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4599 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4600 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4601 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4602 /* implied cookie-ack.. we must have lost the ack */ 4603 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4604 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4605 stcb->asoc.overall_error_count, 4606 0, 4607 SCTP_FROM_SCTP_INPUT, 4608 __LINE__); 4609 } 4610 stcb->asoc.overall_error_count = 0; 4611 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4612 *netp); 4613 } 4614process_control_chunks: 4615 while (IS_SCTP_CONTROL(ch)) { 4616 /* validate chunk length */ 4617 chk_length = ntohs(ch->chunk_length); 4618 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4619 ch->chunk_type, chk_length); 4620 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4621 if (chk_length < sizeof(*ch) || 4622 (*offset + (int)chk_length) > length) { 4623 *offset = length; 4624 if (locked_tcb) { 4625 SCTP_TCB_UNLOCK(locked_tcb); 4626 } 4627 return (NULL); 4628 } 4629 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4630 /* 4631 * INIT-ACK only gets the init ack "header" portion only 4632 * because we don't have to process the peer's COOKIE. All 4633 * others get a complete chunk. 4634 */ 4635 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4636 (ch->chunk_type == SCTP_INITIATION)) { 4637 /* get an init-ack chunk */ 4638 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4639 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4640 if (ch == NULL) { 4641 *offset = length; 4642 if (locked_tcb) { 4643 SCTP_TCB_UNLOCK(locked_tcb); 4644 } 4645 return (NULL); 4646 } 4647 } else { 4648 /* For cookies and all other chunks. */ 4649 if (chk_length > sizeof(chunk_buf)) { 4650 /* 4651 * use just the size of the chunk buffer so 4652 * the front part of our chunks fit in 4653 * contiguous space up to the chunk buffer 4654 * size (508 bytes). For chunks that need to 4655 * get more than that they must use the 4656 * sctp_m_getptr() function or other means 4657 * (e.g. know how to parse mbuf chains). 4658 * Cookies do this already. 4659 */ 4660 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4661 (sizeof(chunk_buf) - 4), 4662 chunk_buf); 4663 if (ch == NULL) { 4664 *offset = length; 4665 if (locked_tcb) { 4666 SCTP_TCB_UNLOCK(locked_tcb); 4667 } 4668 return (NULL); 4669 } 4670 } else { 4671 /* We can fit it all */ 4672 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4673 chk_length, chunk_buf); 4674 if (ch == NULL) { 4675 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4676 *offset = length; 4677 if (locked_tcb) { 4678 SCTP_TCB_UNLOCK(locked_tcb); 4679 } 4680 return (NULL); 4681 } 4682 } 4683 } 4684 num_chunks++; 4685 /* Save off the last place we got a control from */ 4686 if (stcb != NULL) { 4687 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4688 /* 4689 * allow last_control to be NULL if 4690 * ASCONF... ASCONF processing will find the 4691 * right net later 4692 */ 4693 if ((netp != NULL) && (*netp != NULL)) 4694 stcb->asoc.last_control_chunk_from = *netp; 4695 } 4696 } 4697#ifdef SCTP_AUDITING_ENABLED 4698 sctp_audit_log(0xB0, ch->chunk_type); 4699#endif 4700 4701 /* check to see if this chunk required auth, but isn't */ 4702 if ((stcb != NULL) && 4703 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4704 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4705 !stcb->asoc.authenticated) { 4706 /* "silently" ignore */ 4707 SCTP_STAT_INCR(sctps_recvauthmissing); 4708 goto next_chunk; 4709 } 4710 switch (ch->chunk_type) { 4711 case SCTP_INITIATION: 4712 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4713 /* The INIT chunk must be the only chunk. */ 4714 if ((num_chunks > 1) || 4715 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4716 sctp_abort_association(inp, stcb, m, iphlen, 4717 src, dst, sh, NULL, 4718 use_mflowid, mflowid, 4719 vrf_id, port); 4720 *offset = length; 4721 return (NULL); 4722 } 4723 /* Honor our resource limit. */ 4724 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4725 struct mbuf *op_err; 4726 4727 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 4728 sctp_abort_association(inp, stcb, m, iphlen, 4729 src, dst, sh, op_err, 4730 use_mflowid, mflowid, 4731 vrf_id, port); 4732 *offset = length; 4733 return (NULL); 4734 } 4735 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4736 (struct sctp_init_chunk *)ch, inp, 4737 stcb, &abort_no_unlock, 4738 use_mflowid, mflowid, 4739 vrf_id, port); 4740 *offset = length; 4741 if ((!abort_no_unlock) && (locked_tcb)) { 4742 SCTP_TCB_UNLOCK(locked_tcb); 4743 } 4744 return (NULL); 4745 break; 4746 case SCTP_PAD_CHUNK: 4747 break; 4748 case SCTP_INITIATION_ACK: 4749 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4750 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4751 /* We are not interested anymore */ 4752 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4753 ; 4754 } else { 4755 if (locked_tcb != stcb) { 4756 /* Very unlikely */ 4757 SCTP_TCB_UNLOCK(locked_tcb); 4758 } 4759 *offset = length; 4760 if (stcb) { 4761#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4762 so = SCTP_INP_SO(inp); 4763 atomic_add_int(&stcb->asoc.refcnt, 1); 4764 SCTP_TCB_UNLOCK(stcb); 4765 SCTP_SOCKET_LOCK(so, 1); 4766 SCTP_TCB_LOCK(stcb); 4767 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4768#endif 4769 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4770#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4771 SCTP_SOCKET_UNLOCK(so, 1); 4772#endif 4773 } 4774 return (NULL); 4775 } 4776 } 4777 /* The INIT-ACK chunk must be the only chunk. */ 4778 if ((num_chunks > 1) || 4779 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4780 *offset = length; 4781 if (locked_tcb) { 4782 SCTP_TCB_UNLOCK(locked_tcb); 4783 } 4784 return (NULL); 4785 } 4786 if ((netp) && (*netp)) { 4787 ret = sctp_handle_init_ack(m, iphlen, *offset, 4788 src, dst, sh, 4789 (struct sctp_init_ack_chunk *)ch, 4790 stcb, *netp, 4791 &abort_no_unlock, 4792 use_mflowid, mflowid, 4793 vrf_id); 4794 } else { 4795 ret = -1; 4796 } 4797 *offset = length; 4798 if (abort_no_unlock) { 4799 return (NULL); 4800 } 4801 /* 4802 * Special case, I must call the output routine to 4803 * get the cookie echoed 4804 */ 4805 if ((stcb != NULL) && (ret == 0)) { 4806 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4807 } 4808 if (locked_tcb) { 4809 SCTP_TCB_UNLOCK(locked_tcb); 4810 } 4811 return (NULL); 4812 break; 4813 case SCTP_SELECTIVE_ACK: 4814 { 4815 struct sctp_sack_chunk *sack; 4816 int abort_now = 0; 4817 uint32_t a_rwnd, cum_ack; 4818 uint16_t num_seg, num_dup; 4819 uint8_t flags; 4820 int offset_seg, offset_dup; 4821 4822 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4823 SCTP_STAT_INCR(sctps_recvsacks); 4824 if (stcb == NULL) { 4825 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4826 break; 4827 } 4828 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4829 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4830 break; 4831 } 4832 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4833 /*- 4834 * If we have sent a shutdown-ack, we will pay no 4835 * attention to a sack sent in to us since 4836 * we don't care anymore. 4837 */ 4838 break; 4839 } 4840 sack = (struct sctp_sack_chunk *)ch; 4841 flags = ch->chunk_flags; 4842 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4843 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4844 num_dup = ntohs(sack->sack.num_dup_tsns); 4845 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4846 if (sizeof(struct sctp_sack_chunk) + 4847 num_seg * sizeof(struct sctp_gap_ack_block) + 4848 num_dup * sizeof(uint32_t) != chk_length) { 4849 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4850 break; 4851 } 4852 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4853 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4854 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4855 cum_ack, num_seg, a_rwnd); 4856 stcb->asoc.seen_a_sack_this_pkt = 1; 4857 if ((stcb->asoc.pr_sctp_cnt == 0) && 4858 (num_seg == 0) && 4859 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4860 (stcb->asoc.saw_sack_with_frags == 0) && 4861 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4862 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4863 ) { 4864 /* 4865 * We have a SIMPLE sack having no 4866 * prior segments and data on sent 4867 * queue to be acked.. Use the 4868 * faster path sack processing. We 4869 * also allow window update sacks 4870 * with no missing segments to go 4871 * this way too. 4872 */ 4873 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4874 } else { 4875 if (netp && *netp) 4876 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4877 num_seg, 0, num_dup, &abort_now, flags, 4878 cum_ack, a_rwnd, ecne_seen); 4879 } 4880 if (abort_now) { 4881 /* ABORT signal from sack processing */ 4882 *offset = length; 4883 return (NULL); 4884 } 4885 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4886 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4887 (stcb->asoc.stream_queue_cnt == 0)) { 4888 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4889 } 4890 } 4891 break; 4892 /* 4893 * EY - nr_sack: If the received chunk is an 4894 * nr_sack chunk 4895 */ 4896 case SCTP_NR_SELECTIVE_ACK: 4897 { 4898 struct sctp_nr_sack_chunk *nr_sack; 4899 int abort_now = 0; 4900 uint32_t a_rwnd, cum_ack; 4901 uint16_t num_seg, num_nr_seg, num_dup; 4902 uint8_t flags; 4903 int offset_seg, offset_dup; 4904 4905 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4906 SCTP_STAT_INCR(sctps_recvsacks); 4907 if (stcb == NULL) { 4908 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4909 break; 4910 } 4911 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 4912 (stcb->asoc.peer_supports_nr_sack == 0)) { 4913 goto unknown_chunk; 4914 } 4915 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4916 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4917 break; 4918 } 4919 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4920 /*- 4921 * If we have sent a shutdown-ack, we will pay no 4922 * attention to a sack sent in to us since 4923 * we don't care anymore. 4924 */ 4925 break; 4926 } 4927 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4928 flags = ch->chunk_flags; 4929 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4930 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4931 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4932 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4933 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4934 if (sizeof(struct sctp_nr_sack_chunk) + 4935 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4936 num_dup * sizeof(uint32_t) != chk_length) { 4937 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4938 break; 4939 } 4940 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4941 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4942 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4943 cum_ack, num_seg, a_rwnd); 4944 stcb->asoc.seen_a_sack_this_pkt = 1; 4945 if ((stcb->asoc.pr_sctp_cnt == 0) && 4946 (num_seg == 0) && (num_nr_seg == 0) && 4947 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4948 (stcb->asoc.saw_sack_with_frags == 0) && 4949 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4950 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4951 /* 4952 * We have a SIMPLE sack having no 4953 * prior segments and data on sent 4954 * queue to be acked. Use the faster 4955 * path sack processing. We also 4956 * allow window update sacks with no 4957 * missing segments to go this way 4958 * too. 4959 */ 4960 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4961 &abort_now, ecne_seen); 4962 } else { 4963 if (netp && *netp) 4964 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4965 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4966 cum_ack, a_rwnd, ecne_seen); 4967 } 4968 if (abort_now) { 4969 /* ABORT signal from sack processing */ 4970 *offset = length; 4971 return (NULL); 4972 } 4973 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4974 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4975 (stcb->asoc.stream_queue_cnt == 0)) { 4976 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4977 } 4978 } 4979 break; 4980 4981 case SCTP_HEARTBEAT_REQUEST: 4982 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4983 if ((stcb) && netp && *netp) { 4984 SCTP_STAT_INCR(sctps_recvheartbeat); 4985 sctp_send_heartbeat_ack(stcb, m, *offset, 4986 chk_length, *netp); 4987 4988 /* He's alive so give him credit */ 4989 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4990 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4991 stcb->asoc.overall_error_count, 4992 0, 4993 SCTP_FROM_SCTP_INPUT, 4994 __LINE__); 4995 } 4996 stcb->asoc.overall_error_count = 0; 4997 } 4998 break; 4999 case SCTP_HEARTBEAT_ACK: 5000 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5001 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5002 /* Its not ours */ 5003 *offset = length; 5004 if (locked_tcb) { 5005 SCTP_TCB_UNLOCK(locked_tcb); 5006 } 5007 return (NULL); 5008 } 5009 /* He's alive so give him credit */ 5010 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5011 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5012 stcb->asoc.overall_error_count, 5013 0, 5014 SCTP_FROM_SCTP_INPUT, 5015 __LINE__); 5016 } 5017 stcb->asoc.overall_error_count = 0; 5018 SCTP_STAT_INCR(sctps_recvheartbeatack); 5019 if (netp && *netp) 5020 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5021 stcb, *netp); 5022 break; 5023 case SCTP_ABORT_ASSOCIATION: 5024 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5025 (void *)stcb); 5026 if ((stcb) && netp && *netp) 5027 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5028 stcb, *netp); 5029 *offset = length; 5030 return (NULL); 5031 break; 5032 case SCTP_SHUTDOWN: 5033 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5034 (void *)stcb); 5035 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5036 *offset = length; 5037 if (locked_tcb) { 5038 SCTP_TCB_UNLOCK(locked_tcb); 5039 } 5040 return (NULL); 5041 } 5042 if (netp && *netp) { 5043 int abort_flag = 0; 5044 5045 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5046 stcb, *netp, &abort_flag); 5047 if (abort_flag) { 5048 *offset = length; 5049 return (NULL); 5050 } 5051 } 5052 break; 5053 case SCTP_SHUTDOWN_ACK: 5054 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5055 if ((stcb) && (netp) && (*netp)) 5056 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5057 *offset = length; 5058 return (NULL); 5059 break; 5060 5061 case SCTP_OPERATION_ERROR: 5062 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5063 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5064 *offset = length; 5065 return (NULL); 5066 } 5067 break; 5068 case SCTP_COOKIE_ECHO: 5069 SCTPDBG(SCTP_DEBUG_INPUT3, 5070 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5071 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5072 ; 5073 } else { 5074 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5075 /* We are not interested anymore */ 5076 abend: 5077 if (stcb) { 5078 SCTP_TCB_UNLOCK(stcb); 5079 } 5080 *offset = length; 5081 return (NULL); 5082 } 5083 } 5084 /* 5085 * First are we accepting? We do this again here 5086 * since it is possible that a previous endpoint WAS 5087 * listening responded to a INIT-ACK and then 5088 * closed. We opened and bound.. and are now no 5089 * longer listening. 5090 */ 5091 5092 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5093 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5094 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5095 struct mbuf *op_err; 5096 5097 op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); 5098 sctp_abort_association(inp, stcb, m, iphlen, 5099 src, dst, sh, op_err, 5100 use_mflowid, mflowid, 5101 vrf_id, port); 5102 } 5103 *offset = length; 5104 return (NULL); 5105 } else { 5106 struct mbuf *ret_buf; 5107 struct sctp_inpcb *linp; 5108 5109 if (stcb) { 5110 linp = NULL; 5111 } else { 5112 linp = inp; 5113 } 5114 5115 if (linp) { 5116 SCTP_ASOC_CREATE_LOCK(linp); 5117 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5118 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5119 SCTP_ASOC_CREATE_UNLOCK(linp); 5120 goto abend; 5121 } 5122 } 5123 if (netp) { 5124 ret_buf = 5125 sctp_handle_cookie_echo(m, iphlen, 5126 *offset, 5127 src, dst, 5128 sh, 5129 (struct sctp_cookie_echo_chunk *)ch, 5130 &inp, &stcb, netp, 5131 auth_skipped, 5132 auth_offset, 5133 auth_len, 5134 &locked_tcb, 5135 use_mflowid, 5136 mflowid, 5137 vrf_id, 5138 port); 5139 } else { 5140 ret_buf = NULL; 5141 } 5142 if (linp) { 5143 SCTP_ASOC_CREATE_UNLOCK(linp); 5144 } 5145 if (ret_buf == NULL) { 5146 if (locked_tcb) { 5147 SCTP_TCB_UNLOCK(locked_tcb); 5148 } 5149 SCTPDBG(SCTP_DEBUG_INPUT3, 5150 "GAK, null buffer\n"); 5151 *offset = length; 5152 return (NULL); 5153 } 5154 /* if AUTH skipped, see if it verified... */ 5155 if (auth_skipped) { 5156 got_auth = 1; 5157 auth_skipped = 0; 5158 } 5159 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5160 /* 5161 * Restart the timer if we have 5162 * pending data 5163 */ 5164 struct sctp_tmit_chunk *chk; 5165 5166 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5167 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5168 } 5169 } 5170 break; 5171 case SCTP_COOKIE_ACK: 5172 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5173 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5174 if (locked_tcb) { 5175 SCTP_TCB_UNLOCK(locked_tcb); 5176 } 5177 return (NULL); 5178 } 5179 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5180 /* We are not interested anymore */ 5181 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5182 ; 5183 } else if (stcb) { 5184#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5185 so = SCTP_INP_SO(inp); 5186 atomic_add_int(&stcb->asoc.refcnt, 1); 5187 SCTP_TCB_UNLOCK(stcb); 5188 SCTP_SOCKET_LOCK(so, 1); 5189 SCTP_TCB_LOCK(stcb); 5190 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5191#endif 5192 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5193#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5194 SCTP_SOCKET_UNLOCK(so, 1); 5195#endif 5196 *offset = length; 5197 return (NULL); 5198 } 5199 } 5200 /* He's alive so give him credit */ 5201 if ((stcb) && netp && *netp) { 5202 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5203 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5204 stcb->asoc.overall_error_count, 5205 0, 5206 SCTP_FROM_SCTP_INPUT, 5207 __LINE__); 5208 } 5209 stcb->asoc.overall_error_count = 0; 5210 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5211 } 5212 break; 5213 case SCTP_ECN_ECHO: 5214 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5215 /* He's alive so give him credit */ 5216 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5217 /* Its not ours */ 5218 if (locked_tcb) { 5219 SCTP_TCB_UNLOCK(locked_tcb); 5220 } 5221 *offset = length; 5222 return (NULL); 5223 } 5224 if (stcb) { 5225 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5226 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5227 stcb->asoc.overall_error_count, 5228 0, 5229 SCTP_FROM_SCTP_INPUT, 5230 __LINE__); 5231 } 5232 stcb->asoc.overall_error_count = 0; 5233 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5234 stcb); 5235 ecne_seen = 1; 5236 } 5237 break; 5238 case SCTP_ECN_CWR: 5239 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5240 /* He's alive so give him credit */ 5241 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5242 /* Its not ours */ 5243 if (locked_tcb) { 5244 SCTP_TCB_UNLOCK(locked_tcb); 5245 } 5246 *offset = length; 5247 return (NULL); 5248 } 5249 if (stcb) { 5250 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5251 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5252 stcb->asoc.overall_error_count, 5253 0, 5254 SCTP_FROM_SCTP_INPUT, 5255 __LINE__); 5256 } 5257 stcb->asoc.overall_error_count = 0; 5258 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5259 } 5260 break; 5261 case SCTP_SHUTDOWN_COMPLETE: 5262 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5263 /* must be first and only chunk */ 5264 if ((num_chunks > 1) || 5265 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5266 *offset = length; 5267 if (locked_tcb) { 5268 SCTP_TCB_UNLOCK(locked_tcb); 5269 } 5270 return (NULL); 5271 } 5272 if ((stcb) && netp && *netp) { 5273 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5274 stcb, *netp); 5275 } 5276 *offset = length; 5277 return (NULL); 5278 break; 5279 case SCTP_ASCONF: 5280 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5281 /* He's alive so give him credit */ 5282 if (stcb) { 5283 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5284 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5285 stcb->asoc.overall_error_count, 5286 0, 5287 SCTP_FROM_SCTP_INPUT, 5288 __LINE__); 5289 } 5290 stcb->asoc.overall_error_count = 0; 5291 sctp_handle_asconf(m, *offset, src, 5292 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5293 asconf_cnt++; 5294 } 5295 break; 5296 case SCTP_ASCONF_ACK: 5297 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5298 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5299 /* Its not ours */ 5300 if (locked_tcb) { 5301 SCTP_TCB_UNLOCK(locked_tcb); 5302 } 5303 *offset = length; 5304 return (NULL); 5305 } 5306 if ((stcb) && netp && *netp) { 5307 /* He's alive so give him credit */ 5308 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5309 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5310 stcb->asoc.overall_error_count, 5311 0, 5312 SCTP_FROM_SCTP_INPUT, 5313 __LINE__); 5314 } 5315 stcb->asoc.overall_error_count = 0; 5316 sctp_handle_asconf_ack(m, *offset, 5317 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5318 if (abort_no_unlock) 5319 return (NULL); 5320 } 5321 break; 5322 case SCTP_FORWARD_CUM_TSN: 5323 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5324 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5325 /* Its not ours */ 5326 if (locked_tcb) { 5327 SCTP_TCB_UNLOCK(locked_tcb); 5328 } 5329 *offset = length; 5330 return (NULL); 5331 } 5332 /* He's alive so give him credit */ 5333 if (stcb) { 5334 int abort_flag = 0; 5335 5336 stcb->asoc.overall_error_count = 0; 5337 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5338 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5339 stcb->asoc.overall_error_count, 5340 0, 5341 SCTP_FROM_SCTP_INPUT, 5342 __LINE__); 5343 } 5344 *fwd_tsn_seen = 1; 5345 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5346 /* We are not interested anymore */ 5347#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5348 so = SCTP_INP_SO(inp); 5349 atomic_add_int(&stcb->asoc.refcnt, 1); 5350 SCTP_TCB_UNLOCK(stcb); 5351 SCTP_SOCKET_LOCK(so, 1); 5352 SCTP_TCB_LOCK(stcb); 5353 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5354#endif 5355 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5356#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5357 SCTP_SOCKET_UNLOCK(so, 1); 5358#endif 5359 *offset = length; 5360 return (NULL); 5361 } 5362 sctp_handle_forward_tsn(stcb, 5363 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5364 if (abort_flag) { 5365 *offset = length; 5366 return (NULL); 5367 } else { 5368 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5369 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5370 stcb->asoc.overall_error_count, 5371 0, 5372 SCTP_FROM_SCTP_INPUT, 5373 __LINE__); 5374 } 5375 stcb->asoc.overall_error_count = 0; 5376 } 5377 5378 } 5379 break; 5380 case SCTP_STREAM_RESET: 5381 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5382 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5383 /* Its not ours */ 5384 if (locked_tcb) { 5385 SCTP_TCB_UNLOCK(locked_tcb); 5386 } 5387 *offset = length; 5388 return (NULL); 5389 } 5390 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5391 /* We are not interested anymore */ 5392#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5393 so = SCTP_INP_SO(inp); 5394 atomic_add_int(&stcb->asoc.refcnt, 1); 5395 SCTP_TCB_UNLOCK(stcb); 5396 SCTP_SOCKET_LOCK(so, 1); 5397 SCTP_TCB_LOCK(stcb); 5398 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5399#endif 5400 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5401#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5402 SCTP_SOCKET_UNLOCK(so, 1); 5403#endif 5404 *offset = length; 5405 return (NULL); 5406 } 5407 if (stcb->asoc.peer_supports_strreset == 0) { 5408 /* 5409 * hmm, peer should have announced this, but 5410 * we will turn it on since he is sending us 5411 * a stream reset. 5412 */ 5413 stcb->asoc.peer_supports_strreset = 1; 5414 } 5415 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5416 /* stop processing */ 5417 *offset = length; 5418 return (NULL); 5419 } 5420 break; 5421 case SCTP_PACKET_DROPPED: 5422 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5423 /* re-get it all please */ 5424 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5425 /* Its not ours */ 5426 if (locked_tcb) { 5427 SCTP_TCB_UNLOCK(locked_tcb); 5428 } 5429 *offset = length; 5430 return (NULL); 5431 } 5432 if (ch && (stcb) && netp && (*netp)) { 5433 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5434 stcb, *netp, 5435 min(chk_length, (sizeof(chunk_buf) - 4))); 5436 5437 } 5438 break; 5439 5440 case SCTP_AUTHENTICATION: 5441 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5442 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5443 goto unknown_chunk; 5444 5445 if (stcb == NULL) { 5446 /* save the first AUTH for later processing */ 5447 if (auth_skipped == 0) { 5448 auth_offset = *offset; 5449 auth_len = chk_length; 5450 auth_skipped = 1; 5451 } 5452 /* skip this chunk (temporarily) */ 5453 goto next_chunk; 5454 } 5455 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5456 (chk_length > (sizeof(struct sctp_auth_chunk) + 5457 SCTP_AUTH_DIGEST_LEN_MAX))) { 5458 /* Its not ours */ 5459 if (locked_tcb) { 5460 SCTP_TCB_UNLOCK(locked_tcb); 5461 } 5462 *offset = length; 5463 return (NULL); 5464 } 5465 if (got_auth == 1) { 5466 /* skip this chunk... it's already auth'd */ 5467 goto next_chunk; 5468 } 5469 got_auth = 1; 5470 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5471 m, *offset)) { 5472 /* auth HMAC failed so dump the packet */ 5473 *offset = length; 5474 return (stcb); 5475 } else { 5476 /* remaining chunks are HMAC checked */ 5477 stcb->asoc.authenticated = 1; 5478 } 5479 break; 5480 5481 default: 5482 unknown_chunk: 5483 /* it's an unknown chunk! */ 5484 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5485 struct mbuf *mm; 5486 struct sctp_paramhdr *phd; 5487 5488 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5489 0, M_DONTWAIT, 1, MT_DATA); 5490 if (mm) { 5491 phd = mtod(mm, struct sctp_paramhdr *); 5492 /* 5493 * We cheat and use param type since 5494 * we did not bother to define a 5495 * error cause struct. They are the 5496 * same basic format with different 5497 * names. 5498 */ 5499 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5500 phd->param_length = htons(chk_length + sizeof(*phd)); 5501 SCTP_BUF_LEN(mm) = sizeof(*phd); 5502 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT); 5503 if (SCTP_BUF_NEXT(mm)) { 5504 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5505 sctp_m_freem(mm); 5506 } else { 5507#ifdef SCTP_MBUF_LOGGING 5508 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5509 struct mbuf *mat; 5510 5511 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5512 if (SCTP_BUF_IS_EXTENDED(mat)) { 5513 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5514 } 5515 } 5516 } 5517#endif 5518 sctp_queue_op_err(stcb, mm); 5519 } 5520 } else { 5521 sctp_m_freem(mm); 5522 } 5523 } 5524 } 5525 if ((ch->chunk_type & 0x80) == 0) { 5526 /* discard this packet */ 5527 *offset = length; 5528 return (stcb); 5529 } /* else skip this bad chunk and continue... */ 5530 break; 5531 } /* switch (ch->chunk_type) */ 5532 5533 5534next_chunk: 5535 /* get the next chunk */ 5536 *offset += SCTP_SIZE32(chk_length); 5537 if (*offset >= length) { 5538 /* no more data left in the mbuf chain */ 5539 break; 5540 } 5541 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5542 sizeof(struct sctp_chunkhdr), chunk_buf); 5543 if (ch == NULL) { 5544 if (locked_tcb) { 5545 SCTP_TCB_UNLOCK(locked_tcb); 5546 } 5547 *offset = length; 5548 return (NULL); 5549 } 5550 } /* while */ 5551 5552 if (asconf_cnt > 0 && stcb != NULL) { 5553 sctp_send_asconf_ack(stcb); 5554 } 5555 return (stcb); 5556} 5557 5558 5559#ifdef INVARIANTS 5560#ifdef __GNUC__ 5561__attribute__((noinline)) 5562#endif 5563 void 5564 sctp_validate_no_locks(struct sctp_inpcb *inp) 5565{ 5566 struct sctp_tcb *lstcb; 5567 5568 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5569 if (mtx_owned(&lstcb->tcb_mtx)) { 5570 panic("Own lock on stcb at return from input"); 5571 } 5572 } 5573 if (mtx_owned(&inp->inp_create_mtx)) { 5574 panic("Own create lock on inp"); 5575 } 5576 if (mtx_owned(&inp->inp_mtx)) { 5577 panic("Own inp lock on inp"); 5578 } 5579} 5580 5581#endif 5582 5583/* 5584 * common input chunk processing (v4 and v6) 5585 */ 5586void 5587sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5588 struct sockaddr *src, struct sockaddr *dst, 5589 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5590#if !defined(SCTP_WITH_NO_CSUM) 5591 uint8_t compute_crc, 5592#endif 5593 uint8_t ecn_bits, 5594 uint8_t use_mflowid, uint32_t mflowid, 5595 uint32_t vrf_id, uint16_t port) 5596{ 5597 uint32_t high_tsn; 5598 int fwd_tsn_seen = 0, data_processed = 0; 5599 struct mbuf *m = *mm; 5600 int un_sent; 5601 int cnt_ctrl_ready = 0; 5602 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5603 struct sctp_tcb *stcb = NULL; 5604 struct sctp_nets *net = NULL; 5605 5606 SCTP_STAT_INCR(sctps_recvdatagrams); 5607#ifdef SCTP_AUDITING_ENABLED 5608 sctp_audit_log(0xE0, 1); 5609 sctp_auditing(0, inp, stcb, net); 5610#endif 5611#if !defined(SCTP_WITH_NO_CSUM) 5612 if (compute_crc != 0) { 5613 uint32_t check, calc_check; 5614 5615 check = sh->checksum; 5616 sh->checksum = 0; 5617 calc_check = sctp_calculate_cksum(m, iphlen); 5618 sh->checksum = check; 5619 if (calc_check != check) { 5620 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5621 calc_check, check, (void *)m, length, iphlen); 5622 stcb = sctp_findassociation_addr(m, offset, src, dst, 5623 sh, ch, &inp, &net, vrf_id); 5624 if ((net != NULL) && (port != 0)) { 5625 if (net->port == 0) { 5626 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5627 } 5628 net->port = port; 5629 } 5630 if ((net != NULL) && (use_mflowid != 0)) { 5631 net->flowid = mflowid; 5632#ifdef INVARIANTS 5633 net->flowidset = 1; 5634#endif 5635 } 5636 if ((inp != NULL) && (stcb != NULL)) { 5637 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5638 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5639 } else if ((inp != NULL) && (stcb == NULL)) { 5640 inp_decr = inp; 5641 } 5642 SCTP_STAT_INCR(sctps_badsum); 5643 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5644 goto out; 5645 } 5646 } 5647#endif 5648 /* Destination port of 0 is illegal, based on RFC4960. */ 5649 if (sh->dest_port == 0) { 5650 SCTP_STAT_INCR(sctps_hdrops); 5651 goto out; 5652 } 5653 stcb = sctp_findassociation_addr(m, offset, src, dst, 5654 sh, ch, &inp, &net, vrf_id); 5655 if ((net != NULL) && (port != 0)) { 5656 if (net->port == 0) { 5657 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5658 } 5659 net->port = port; 5660 } 5661 if ((net != NULL) && (use_mflowid != 0)) { 5662 net->flowid = mflowid; 5663#ifdef INVARIANTS 5664 net->flowidset = 1; 5665#endif 5666 } 5667 if (inp == NULL) { 5668 SCTP_STAT_INCR(sctps_noport); 5669 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5670 goto out; 5671 } 5672 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5673 sctp_send_shutdown_complete2(src, dst, sh, 5674 use_mflowid, mflowid, 5675 vrf_id, port); 5676 goto out; 5677 } 5678 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5679 goto out; 5680 } 5681 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5682 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5683 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5684 (ch->chunk_type != SCTP_INIT))) { 5685 sctp_send_abort(m, iphlen, src, dst, 5686 sh, 0, NULL, 5687 use_mflowid, mflowid, 5688 vrf_id, port); 5689 } 5690 } 5691 goto out; 5692 } else if (stcb == NULL) { 5693 inp_decr = inp; 5694 } 5695#ifdef IPSEC 5696 /*- 5697 * I very much doubt any of the IPSEC stuff will work but I have no 5698 * idea, so I will leave it in place. 5699 */ 5700 if (inp != NULL) { 5701 switch (dst->sa_family) { 5702#ifdef INET 5703 case AF_INET: 5704 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5705 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5706 SCTP_STAT_INCR(sctps_hdrops); 5707 goto out; 5708 } 5709 break; 5710#endif 5711#ifdef INET6 5712 case AF_INET6: 5713 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5714 MODULE_GLOBAL(ipsec6stat).in_polvio++; 5715 SCTP_STAT_INCR(sctps_hdrops); 5716 goto out; 5717 } 5718 break; 5719#endif 5720 default: 5721 break; 5722 } 5723 } 5724#endif 5725 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5726 (void *)m, iphlen, offset, length, (void *)stcb); 5727 if (stcb) { 5728 /* always clear this before beginning a packet */ 5729 stcb->asoc.authenticated = 0; 5730 stcb->asoc.seen_a_sack_this_pkt = 0; 5731 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5732 (void *)stcb, stcb->asoc.state); 5733 5734 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5735 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5736 /*- 5737 * If we hit here, we had a ref count 5738 * up when the assoc was aborted and the 5739 * timer is clearing out the assoc, we should 5740 * NOT respond to any packet.. its OOTB. 5741 */ 5742 SCTP_TCB_UNLOCK(stcb); 5743 stcb = NULL; 5744 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5745 use_mflowid, mflowid, 5746 vrf_id, port); 5747 goto out; 5748 } 5749 } 5750 if (IS_SCTP_CONTROL(ch)) { 5751 /* process the control portion of the SCTP packet */ 5752 /* sa_ignore NO_NULL_CHK */ 5753 stcb = sctp_process_control(m, iphlen, &offset, length, 5754 src, dst, sh, ch, 5755 inp, stcb, &net, &fwd_tsn_seen, 5756 use_mflowid, mflowid, 5757 vrf_id, port); 5758 if (stcb) { 5759 /* 5760 * This covers us if the cookie-echo was there and 5761 * it changes our INP. 5762 */ 5763 inp = stcb->sctp_ep; 5764 if ((net) && (port)) { 5765 if (net->port == 0) { 5766 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5767 } 5768 net->port = port; 5769 } 5770 } 5771 } else { 5772 /* 5773 * no control chunks, so pre-process DATA chunks (these 5774 * checks are taken care of by control processing) 5775 */ 5776 5777 /* 5778 * if DATA only packet, and auth is required, then punt... 5779 * can't have authenticated without any AUTH (control) 5780 * chunks 5781 */ 5782 if ((stcb != NULL) && 5783 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5784 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5785 /* "silently" ignore */ 5786 SCTP_STAT_INCR(sctps_recvauthmissing); 5787 goto out; 5788 } 5789 if (stcb == NULL) { 5790 /* out of the blue DATA chunk */ 5791 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5792 use_mflowid, mflowid, 5793 vrf_id, port); 5794 goto out; 5795 } 5796 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5797 /* v_tag mismatch! */ 5798 SCTP_STAT_INCR(sctps_badvtag); 5799 goto out; 5800 } 5801 } 5802 5803 if (stcb == NULL) { 5804 /* 5805 * no valid TCB for this packet, or we found it's a bad 5806 * packet while processing control, or we're done with this 5807 * packet (done or skip rest of data), so we drop it... 5808 */ 5809 goto out; 5810 } 5811 /* 5812 * DATA chunk processing 5813 */ 5814 /* plow through the data chunks while length > offset */ 5815 5816 /* 5817 * Rest should be DATA only. Check authentication state if AUTH for 5818 * DATA is required. 5819 */ 5820 if ((length > offset) && 5821 (stcb != NULL) && 5822 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5823 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5824 !stcb->asoc.authenticated) { 5825 /* "silently" ignore */ 5826 SCTP_STAT_INCR(sctps_recvauthmissing); 5827 SCTPDBG(SCTP_DEBUG_AUTH1, 5828 "Data chunk requires AUTH, skipped\n"); 5829 goto trigger_send; 5830 } 5831 if (length > offset) { 5832 int retval; 5833 5834 /* 5835 * First check to make sure our state is correct. We would 5836 * not get here unless we really did have a tag, so we don't 5837 * abort if this happens, just dump the chunk silently. 5838 */ 5839 switch (SCTP_GET_STATE(&stcb->asoc)) { 5840 case SCTP_STATE_COOKIE_ECHOED: 5841 /* 5842 * we consider data with valid tags in this state 5843 * shows us the cookie-ack was lost. Imply it was 5844 * there. 5845 */ 5846 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5847 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5848 stcb->asoc.overall_error_count, 5849 0, 5850 SCTP_FROM_SCTP_INPUT, 5851 __LINE__); 5852 } 5853 stcb->asoc.overall_error_count = 0; 5854 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5855 break; 5856 case SCTP_STATE_COOKIE_WAIT: 5857 /* 5858 * We consider OOTB any data sent during asoc setup. 5859 */ 5860 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, 5861 use_mflowid, mflowid, 5862 vrf_id, port); 5863 goto out; 5864 /* sa_ignore NOTREACHED */ 5865 break; 5866 case SCTP_STATE_EMPTY: /* should not happen */ 5867 case SCTP_STATE_INUSE: /* should not happen */ 5868 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5869 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5870 default: 5871 goto out; 5872 /* sa_ignore NOTREACHED */ 5873 break; 5874 case SCTP_STATE_OPEN: 5875 case SCTP_STATE_SHUTDOWN_SENT: 5876 break; 5877 } 5878 /* plow through the data chunks while length > offset */ 5879 retval = sctp_process_data(mm, iphlen, &offset, length, 5880 src, dst, sh, 5881 inp, stcb, net, &high_tsn, 5882 use_mflowid, mflowid, 5883 vrf_id, port); 5884 if (retval == 2) { 5885 /* 5886 * The association aborted, NO UNLOCK needed since 5887 * the association is destroyed. 5888 */ 5889 stcb = NULL; 5890 goto out; 5891 } 5892 data_processed = 1; 5893 /* 5894 * Anything important needs to have been m_copy'ed in 5895 * process_data 5896 */ 5897 } 5898 /* take care of ecn */ 5899 if ((data_processed == 1) && 5900 (stcb->asoc.ecn_allowed == 1) && 5901 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5902 /* Yep, we need to add a ECNE */ 5903 sctp_send_ecn_echo(stcb, net, high_tsn); 5904 } 5905 if ((data_processed == 0) && (fwd_tsn_seen)) { 5906 int was_a_gap; 5907 uint32_t highest_tsn; 5908 5909 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5910 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5911 } else { 5912 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5913 } 5914 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5915 stcb->asoc.send_sack = 1; 5916 sctp_sack_check(stcb, was_a_gap); 5917 } else if (fwd_tsn_seen) { 5918 stcb->asoc.send_sack = 1; 5919 } 5920 /* trigger send of any chunks in queue... */ 5921trigger_send: 5922#ifdef SCTP_AUDITING_ENABLED 5923 sctp_audit_log(0xE0, 2); 5924 sctp_auditing(1, inp, stcb, net); 5925#endif 5926 SCTPDBG(SCTP_DEBUG_INPUT1, 5927 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5928 stcb->asoc.peers_rwnd, 5929 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5930 stcb->asoc.total_flight); 5931 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5932 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5933 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5934 } 5935 if (cnt_ctrl_ready || 5936 ((un_sent) && 5937 (stcb->asoc.peers_rwnd > 0 || 5938 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5939 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5940 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5941 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5942 } 5943#ifdef SCTP_AUDITING_ENABLED 5944 sctp_audit_log(0xE0, 3); 5945 sctp_auditing(2, inp, stcb, net); 5946#endif 5947out: 5948 if (stcb != NULL) { 5949 SCTP_TCB_UNLOCK(stcb); 5950 } 5951 if (inp_decr != NULL) { 5952 /* reduce ref-count */ 5953 SCTP_INP_WLOCK(inp_decr); 5954 SCTP_INP_DECR_REF(inp_decr); 5955 SCTP_INP_WUNLOCK(inp_decr); 5956 } 5957#ifdef INVARIANTS 5958 if (inp != NULL) { 5959 sctp_validate_no_locks(inp); 5960 } 5961#endif 5962 return; 5963} 5964 5965#if 0 5966static void 5967sctp_print_mbuf_chain(struct mbuf *m) 5968{ 5969 for (; m; m = SCTP_BUF_NEXT(m)) { 5970 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5971 if (SCTP_BUF_IS_EXTENDED(m)) 5972 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5973 } 5974} 5975 5976#endif 5977 5978#ifdef INET 5979void 5980sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5981{ 5982 struct mbuf *m; 5983 int iphlen; 5984 uint32_t vrf_id = 0; 5985 uint8_t ecn_bits; 5986 struct sockaddr_in src, dst; 5987 struct ip *ip; 5988 struct sctphdr *sh; 5989 struct sctp_chunkhdr *ch; 5990 int length, offset; 5991 5992#if !defined(SCTP_WITH_NO_CSUM) 5993 uint8_t compute_crc; 5994 5995#endif 5996 uint32_t mflowid; 5997 uint8_t use_mflowid; 5998 5999 iphlen = off; 6000 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6001 SCTP_RELEASE_PKT(i_pak); 6002 return; 6003 } 6004 m = SCTP_HEADER_TO_CHAIN(i_pak); 6005#ifdef SCTP_MBUF_LOGGING 6006 /* Log in any input mbufs */ 6007 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6008 struct mbuf *mat; 6009 6010 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6011 if (SCTP_BUF_IS_EXTENDED(mat)) { 6012 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6013 } 6014 } 6015 } 6016#endif 6017#ifdef SCTP_PACKET_LOGGING 6018 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6019 sctp_packet_log(m); 6020 } 6021#endif 6022 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6023 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 6024 m->m_pkthdr.len, 6025 if_name(m->m_pkthdr.rcvif), 6026 m->m_pkthdr.csum_flags); 6027 if (m->m_flags & M_FLOWID) { 6028 mflowid = m->m_pkthdr.flowid; 6029 use_mflowid = 1; 6030 } else { 6031 mflowid = 0; 6032 use_mflowid = 0; 6033 } 6034 SCTP_STAT_INCR(sctps_recvpackets); 6035 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6036 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6037 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6038 if (SCTP_BUF_LEN(m) < offset) { 6039 if ((m = m_pullup(m, offset)) == NULL) { 6040 SCTP_STAT_INCR(sctps_hdrops); 6041 return; 6042 } 6043 } 6044 ip = mtod(m, struct ip *); 6045 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6046 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6047 offset -= sizeof(struct sctp_chunkhdr); 6048 memset(&src, 0, sizeof(struct sockaddr_in)); 6049 src.sin_family = AF_INET; 6050 src.sin_len = sizeof(struct sockaddr_in); 6051 src.sin_port = sh->src_port; 6052 src.sin_addr = ip->ip_src; 6053 memset(&dst, 0, sizeof(struct sockaddr_in)); 6054 dst.sin_family = AF_INET; 6055 dst.sin_len = sizeof(struct sockaddr_in); 6056 dst.sin_port = sh->dest_port; 6057 dst.sin_addr = ip->ip_dst; 6058 length = ip->ip_len + iphlen; 6059 /* Validate mbuf chain length with IP payload length. */ 6060 if (SCTP_HEADER_LEN(m) != length) { 6061 SCTPDBG(SCTP_DEBUG_INPUT1, 6062 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6063 SCTP_STAT_INCR(sctps_hdrops); 6064 goto out; 6065 } 6066 /* SCTP does not allow broadcasts or multicasts */ 6067 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6068 goto out; 6069 } 6070 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6071 goto out; 6072 } 6073 ecn_bits = ip->ip_tos; 6074#if defined(SCTP_WITH_NO_CSUM) 6075 SCTP_STAT_INCR(sctps_recvnocrc); 6076#else 6077 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6078 SCTP_STAT_INCR(sctps_recvhwcrc); 6079 compute_crc = 0; 6080 } else { 6081 SCTP_STAT_INCR(sctps_recvswcrc); 6082 compute_crc = 1; 6083 } 6084#endif 6085 sctp_common_input_processing(&m, iphlen, offset, length, 6086 (struct sockaddr *)&src, 6087 (struct sockaddr *)&dst, 6088 sh, ch, 6089#if !defined(SCTP_WITH_NO_CSUM) 6090 compute_crc, 6091#endif 6092 ecn_bits, 6093 use_mflowid, mflowid, 6094 vrf_id, port); 6095out: 6096 if (m) { 6097 sctp_m_freem(m); 6098 } 6099 return; 6100} 6101 6102#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6103extern int *sctp_cpuarry; 6104 6105#endif 6106 6107void 6108sctp_input(struct mbuf *m, int off) 6109{ 6110#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6111 struct ip *ip; 6112 struct sctphdr *sh; 6113 int offset; 6114 int cpu_to_use; 6115 uint32_t flowid, tag; 6116 6117 if (mp_ncpus > 1) { 6118 if (m->m_flags & M_FLOWID) { 6119 flowid = m->m_pkthdr.flowid; 6120 } else { 6121 /* 6122 * No flow id built by lower layers fix it so we 6123 * create one. 6124 */ 6125 offset = off + sizeof(struct sctphdr); 6126 if (SCTP_BUF_LEN(m) < offset) { 6127 if ((m = m_pullup(m, offset)) == NULL) { 6128 SCTP_STAT_INCR(sctps_hdrops); 6129 return; 6130 } 6131 } 6132 ip = mtod(m, struct ip *); 6133 sh = (struct sctphdr *)((caddr_t)ip + off); 6134 tag = htonl(sh->v_tag); 6135 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6136 m->m_pkthdr.flowid = flowid; 6137 m->m_flags |= M_FLOWID; 6138 } 6139 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6140 sctp_queue_to_mcore(m, off, cpu_to_use); 6141 return; 6142 } 6143#endif 6144 sctp_input_with_port(m, off, 0); 6145} 6146 6147#endif 6148