sctp_input.c revision 284633
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: stable/10/sys/netinet/sctp_input.c 284633 2015-06-20 08:25:27Z 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#if defined(INET) || defined(INET6) 51#include <netinet/udp.h> 52#endif 53#include <sys/smp.h> 54 55 56 57static void 58sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59{ 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81} 82 83/* INIT handler */ 84static void 85sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91{ 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* 165 * We are only accepting if we have a socket with positive 166 * so_qlimit. 167 */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (inp->sctp_socket == NULL) || 172 (inp->sctp_socket->so_qlimit == 0))) { 173 /* 174 * FIX ME ?? What about TCP model and we have a 175 * match/restart case? Actually no fix is needed. the lookup 176 * will always find the existing assoc so stcb would not be 177 * NULL. It may be questionable to do this since we COULD 178 * just send back the INIT-ACK and hope that the app did 179 * accept()'s by the time the COOKIE was sent. But there is 180 * a price to pay for COOKIE generation and I don't want to 181 * pay it on the chance that the app will actually do some 182 * accepts(). The App just looses and should NOT be in this 183 * state :-) 184 */ 185 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 186 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 187 "No listener"); 188 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 189 mflowtype, mflowid, inp->fibnum, 190 vrf_id, port); 191 } 192 goto outnow; 193 } 194 if ((stcb != NULL) && 195 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 197 sctp_send_shutdown_ack(stcb, NULL); 198 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 199 } else { 200 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 201 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 202 sh, cp, 203 mflowtype, mflowid, 204 vrf_id, port, 205 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 206 } 207outnow: 208 if (stcb == NULL) { 209 SCTP_INP_RUNLOCK(inp); 210 } 211} 212 213/* 214 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 215 */ 216 217int 218sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 219#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 220 SCTP_UNUSED 221#endif 222) 223{ 224 int unsent_data = 0; 225 unsigned int i; 226 struct sctp_stream_queue_pending *sp; 227 struct sctp_association *asoc; 228 229 /* 230 * This function returns the number of streams that have true unsent 231 * data on them. Note that as it looks through it will clean up any 232 * places that have old data that has been sent but left at top of 233 * stream queue. 234 */ 235 asoc = &stcb->asoc; 236 SCTP_TCB_SEND_LOCK(stcb); 237 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 238 /* Check to see if some data queued */ 239 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 240 /* sa_ignore FREED_MEMORY */ 241 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 242 if (sp == NULL) { 243 continue; 244 } 245 if ((sp->msg_is_complete) && 246 (sp->length == 0) && 247 (sp->sender_all_done)) { 248 /* 249 * We are doing differed cleanup. Last time 250 * through when we took all the data the 251 * sender_all_done was not set. 252 */ 253 if (sp->put_last_out == 0) { 254 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 255 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 256 sp->sender_all_done, 257 sp->length, 258 sp->msg_is_complete, 259 sp->put_last_out); 260 } 261 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 262 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 263 if (sp->net) { 264 sctp_free_remote_addr(sp->net); 265 sp->net = NULL; 266 } 267 if (sp->data) { 268 sctp_m_freem(sp->data); 269 sp->data = NULL; 270 } 271 sctp_free_a_strmoq(stcb, sp, so_locked); 272 } else { 273 unsent_data++; 274 break; 275 } 276 } 277 } 278 SCTP_TCB_SEND_UNLOCK(stcb); 279 return (unsent_data); 280} 281 282static int 283sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 284{ 285 struct sctp_init *init; 286 struct sctp_association *asoc; 287 struct sctp_nets *lnet; 288 unsigned int i; 289 290 init = &cp->init; 291 asoc = &stcb->asoc; 292 /* save off parameters */ 293 asoc->peer_vtag = ntohl(init->initiate_tag); 294 asoc->peers_rwnd = ntohl(init->a_rwnd); 295 /* init tsn's */ 296 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 297 298 if (!TAILQ_EMPTY(&asoc->nets)) { 299 /* update any ssthresh's that may have a default */ 300 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 301 lnet->ssthresh = asoc->peers_rwnd; 302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 303 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 304 } 305 } 306 } 307 SCTP_TCB_SEND_LOCK(stcb); 308 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 309 unsigned int newcnt; 310 struct sctp_stream_out *outs; 311 struct sctp_stream_queue_pending *sp, *nsp; 312 struct sctp_tmit_chunk *chk, *nchk; 313 314 /* abandon the upper streams */ 315 newcnt = ntohs(init->num_inbound_streams); 316 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 317 if (chk->rec.data.stream_number >= newcnt) { 318 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 319 asoc->send_queue_cnt--; 320 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 321 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 322#ifdef INVARIANTS 323 } else { 324 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 325#endif 326 } 327 if (chk->data != NULL) { 328 sctp_free_bufspace(stcb, asoc, chk, 1); 329 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 330 0, chk, SCTP_SO_NOT_LOCKED); 331 if (chk->data) { 332 sctp_m_freem(chk->data); 333 chk->data = NULL; 334 } 335 } 336 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 337 /* sa_ignore FREED_MEMORY */ 338 } 339 } 340 if (asoc->strmout) { 341 for (i = newcnt; i < asoc->pre_open_streams; i++) { 342 outs = &asoc->strmout[i]; 343 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 344 TAILQ_REMOVE(&outs->outqueue, sp, next); 345 asoc->stream_queue_cnt--; 346 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 347 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 348 if (sp->data) { 349 sctp_m_freem(sp->data); 350 sp->data = NULL; 351 } 352 if (sp->net) { 353 sctp_free_remote_addr(sp->net); 354 sp->net = NULL; 355 } 356 /* Free the chunk */ 357 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 358 /* sa_ignore FREED_MEMORY */ 359 } 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 367 368 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 369 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 370 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 371 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 372 } 373 /* This is the next one we expect */ 374 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 375 376 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 377 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 378 379 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 380 /* open the requested streams */ 381 382 if (asoc->strmin != NULL) { 383 /* Free the old ones */ 384 struct sctp_queued_to_read *ctl, *nctl; 385 386 for (i = 0; i < asoc->streamincnt; i++) { 387 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 388 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 389 sctp_free_remote_addr(ctl->whoFrom); 390 ctl->whoFrom = NULL; 391 sctp_m_freem(ctl->data); 392 ctl->data = NULL; 393 sctp_free_a_readq(stcb, ctl); 394 } 395 } 396 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 397 } 398 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 399 asoc->streamincnt = ntohs(init->num_outbound_streams); 400 } else { 401 asoc->streamincnt = asoc->max_inbound_streams; 402 } 403 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 404 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 405 if (asoc->strmin == NULL) { 406 /* we didn't get memory for the streams! */ 407 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 408 return (-1); 409 } 410 for (i = 0; i < asoc->streamincnt; i++) { 411 asoc->strmin[i].stream_no = i; 412 asoc->strmin[i].last_sequence_delivered = 0xffff; 413 TAILQ_INIT(&asoc->strmin[i].inqueue); 414 asoc->strmin[i].delivery_started = 0; 415 } 416 /* 417 * load_address_from_init will put the addresses into the 418 * association when the COOKIE is processed or the INIT-ACK is 419 * processed. Both types of COOKIE's existing and new call this 420 * routine. It will remove addresses that are no longer in the 421 * association (for the restarting case where addresses are 422 * removed). Up front when the INIT arrives we will discard it if it 423 * is a restart and new addresses have been added. 424 */ 425 /* sa_ignore MEMLEAK */ 426 return (0); 427} 428 429/* 430 * INIT-ACK message processing/consumption returns value < 0 on error 431 */ 432static int 433sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 434 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 435 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 436 struct sctp_nets *net, int *abort_no_unlock, 437 uint8_t mflowtype, uint32_t mflowid, 438 uint32_t vrf_id) 439{ 440 struct sctp_association *asoc; 441 struct mbuf *op_err; 442 int retval, abort_flag; 443 uint32_t initack_limit; 444 int nat_friendly = 0; 445 446 /* First verify that we have no illegal param's */ 447 abort_flag = 0; 448 449 op_err = sctp_arethere_unrecognized_parameters(m, 450 (offset + sizeof(struct sctp_init_chunk)), 451 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 asoc = &stcb->asoc; 459 asoc->peer_supports_nat = (uint8_t) nat_friendly; 460 /* process the peer's parameters in the INIT-ACK */ 461 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 462 if (retval < 0) { 463 return (retval); 464 } 465 initack_limit = offset + ntohs(cp->ch.chunk_length); 466 /* load all addresses */ 467 if ((retval = sctp_load_addresses_from_init(stcb, m, 468 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 469 src, dst, NULL))) { 470 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 471 "Problem with address parameters"); 472 SCTPDBG(SCTP_DEBUG_INPUT1, 473 "Load addresses from INIT causes an abort %d\n", 474 retval); 475 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 476 src, dst, sh, op_err, 477 mflowtype, mflowid, 478 vrf_id, net->port); 479 *abort_no_unlock = 1; 480 return (-1); 481 } 482 /* if the peer doesn't support asconf, flush the asconf queue */ 483 if (asoc->asconf_supported == 0) { 484 struct sctp_asconf_addr *param, *nparam; 485 486 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 487 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 488 SCTP_FREE(param, SCTP_M_ASC_ADDR); 489 } 490 } 491 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 492 stcb->asoc.local_hmacs); 493 if (op_err) { 494 sctp_queue_op_err(stcb, op_err); 495 /* queuing will steal away the mbuf chain to the out queue */ 496 op_err = NULL; 497 } 498 /* extract the cookie and queue it to "echo" it back... */ 499 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 500 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 501 stcb->asoc.overall_error_count, 502 0, 503 SCTP_FROM_SCTP_INPUT, 504 __LINE__); 505 } 506 stcb->asoc.overall_error_count = 0; 507 net->error_count = 0; 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assue that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 517 518 /* calculate the RTO */ 519 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 520 SCTP_RTT_FROM_NON_DATA); 521 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 /* We abort with an error of missing mandatory param */ 531 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 532 if (op_err) { 533 /* 534 * Expand beyond to include the mandatory 535 * param cookie 536 */ 537 struct sctp_inv_mandatory_param *mp; 538 539 SCTP_BUF_LEN(op_err) = 540 sizeof(struct sctp_inv_mandatory_param); 541 mp = mtod(op_err, 542 struct sctp_inv_mandatory_param *); 543 /* Subtract the reserved param */ 544 mp->length = 545 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 546 mp->num_param = htonl(1); 547 mp->param = htons(SCTP_STATE_COOKIE); 548 mp->resv = 0; 549 } 550 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 551 src, dst, sh, op_err, 552 mflowtype, mflowid, 553 vrf_id, net->port); 554 *abort_no_unlock = 1; 555 } 556 return (retval); 557 } 558 return (0); 559} 560 561static void 562sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 563 struct sctp_tcb *stcb, struct sctp_nets *net) 564{ 565 union sctp_sockstore store; 566 struct sctp_nets *r_net, *f_net; 567 struct timeval tv; 568 int req_prim = 0; 569 uint16_t old_error_counter; 570 571 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 572 /* Invalid length */ 573 return; 574 } 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577#ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589#endif 590#ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601#endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficent if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 old_error_counter = r_net->error_count; 641 r_net->error_count = 0; 642 r_net->hb_responded = 1; 643 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 644 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 645 /* Now lets do a RTO with this */ 646 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 647 SCTP_RTT_FROM_NON_DATA); 648 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 649 r_net->dest_state |= SCTP_ADDR_REACHABLE; 650 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 651 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 652 } 653 if (r_net->dest_state & SCTP_ADDR_PF) { 654 r_net->dest_state &= ~SCTP_ADDR_PF; 655 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 656 } 657 if (old_error_counter > 0) { 658 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 659 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 660 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 661 } 662 if (r_net == stcb->asoc.primary_destination) { 663 if (stcb->asoc.alternate) { 664 /* release the alternate, primary is good */ 665 sctp_free_remote_addr(stcb->asoc.alternate); 666 stcb->asoc.alternate = NULL; 667 } 668 } 669 /* Mobility adaptation */ 670 if (req_prim) { 671 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_BASE) || 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_FASTHANDOFF)) && 675 sctp_is_mobility_feature_on(stcb->sctp_ep, 676 SCTP_MOBILITY_PRIM_DELETED)) { 677 678 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 679 stcb->sctp_ep, stcb, NULL, 680 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 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.auth_supported == 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, 803 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 804 /* notify user of the abort and clean up... */ 805 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 806 /* free the tcb */ 807 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 808 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 809 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 810 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 811 } 812#ifdef SCTP_ASOCLOG_OF_TSNS 813 sctp_print_out_track_log(stcb); 814#endif 815#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 816 so = SCTP_INP_SO(stcb->sctp_ep); 817 atomic_add_int(&stcb->asoc.refcnt, 1); 818 SCTP_TCB_UNLOCK(stcb); 819 SCTP_SOCKET_LOCK(so, 1); 820 SCTP_TCB_LOCK(stcb); 821 atomic_subtract_int(&stcb->asoc.refcnt, 1); 822#endif 823 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 824 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 825 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 826#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 827 SCTP_SOCKET_UNLOCK(so, 1); 828#endif 829 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 830} 831 832static void 833sctp_start_net_timers(struct sctp_tcb *stcb) 834{ 835 uint32_t cnt_hb_sent; 836 struct sctp_nets *net; 837 838 cnt_hb_sent = 0; 839 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 840 /* 841 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 842 * If the dest in unconfirmed send a hb as well if under 843 * max_hb_burst have been sent. 844 */ 845 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 846 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 847 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 848 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 849 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 850 cnt_hb_sent++; 851 } 852 } 853 if (cnt_hb_sent) { 854 sctp_chunk_output(stcb->sctp_ep, stcb, 855 SCTP_OUTPUT_FROM_COOKIE_ACK, 856 SCTP_SO_NOT_LOCKED); 857 } 858} 859 860 861static void 862sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 863 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 864{ 865 struct sctp_association *asoc; 866 int some_on_streamwheel; 867 868#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 869 struct socket *so; 870 871#endif 872 873 SCTPDBG(SCTP_DEBUG_INPUT2, 874 "sctp_handle_shutdown: handling SHUTDOWN\n"); 875 if (stcb == NULL) 876 return; 877 asoc = &stcb->asoc; 878 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 879 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 880 return; 881 } 882 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 883 /* Shutdown NOT the expected size */ 884 return; 885 } else { 886 sctp_update_acked(stcb, cp, abort_flag); 887 if (*abort_flag) { 888 return; 889 } 890 } 891 if (asoc->control_pdapi) { 892 /* 893 * With a normal shutdown we assume the end of last record. 894 */ 895 SCTP_INP_READ_LOCK(stcb->sctp_ep); 896 asoc->control_pdapi->end_added = 1; 897 asoc->control_pdapi->pdapi_aborted = 1; 898 asoc->control_pdapi = NULL; 899 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 900#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 901 so = SCTP_INP_SO(stcb->sctp_ep); 902 atomic_add_int(&stcb->asoc.refcnt, 1); 903 SCTP_TCB_UNLOCK(stcb); 904 SCTP_SOCKET_LOCK(so, 1); 905 SCTP_TCB_LOCK(stcb); 906 atomic_subtract_int(&stcb->asoc.refcnt, 1); 907 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 908 /* assoc was freed while we were unlocked */ 909 SCTP_SOCKET_UNLOCK(so, 1); 910 return; 911 } 912#endif 913 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 914#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 915 SCTP_SOCKET_UNLOCK(so, 1); 916#endif 917 } 918 /* goto SHUTDOWN_RECEIVED state to block new requests */ 919 if (stcb->sctp_socket) { 920 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 921 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 922 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 923 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 924 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 925 /* 926 * notify upper layer that peer has initiated a 927 * shutdown 928 */ 929 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 930 931 /* reset time */ 932 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 933 } 934 } 935 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 936 /* 937 * stop the shutdown timer, since we WILL move to 938 * SHUTDOWN-ACK-SENT. 939 */ 940 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 941 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 942 } 943 /* Now is there unsent data on a stream somewhere? */ 944 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 945 946 if (!TAILQ_EMPTY(&asoc->send_queue) || 947 !TAILQ_EMPTY(&asoc->sent_queue) || 948 some_on_streamwheel) { 949 /* By returning we will push more data out */ 950 return; 951 } else { 952 /* no outstanding data to send, so move on... */ 953 /* send SHUTDOWN-ACK */ 954 /* move to SHUTDOWN-ACK-SENT state */ 955 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 956 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 957 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 958 } 959 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 960 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 961 sctp_stop_timers_for_shutdown(stcb); 962 sctp_send_shutdown_ack(stcb, net); 963 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 964 stcb, net); 965 } 966} 967 968static void 969sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 970 struct sctp_tcb *stcb, 971 struct sctp_nets *net) 972{ 973 struct sctp_association *asoc; 974 975#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 976 struct socket *so; 977 978 so = SCTP_INP_SO(stcb->sctp_ep); 979#endif 980 SCTPDBG(SCTP_DEBUG_INPUT2, 981 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 982 if (stcb == NULL) 983 return; 984 985 asoc = &stcb->asoc; 986 /* process according to association state */ 987 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 988 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 989 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 990 sctp_send_shutdown_complete(stcb, net, 1); 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 995 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 996 /* unexpected SHUTDOWN-ACK... so ignore... */ 997 SCTP_TCB_UNLOCK(stcb); 998 return; 999 } 1000 if (asoc->control_pdapi) { 1001 /* 1002 * With a normal shutdown we assume the end of last record. 1003 */ 1004 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1005 asoc->control_pdapi->end_added = 1; 1006 asoc->control_pdapi->pdapi_aborted = 1; 1007 asoc->control_pdapi = NULL; 1008 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1009#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1010 atomic_add_int(&stcb->asoc.refcnt, 1); 1011 SCTP_TCB_UNLOCK(stcb); 1012 SCTP_SOCKET_LOCK(so, 1); 1013 SCTP_TCB_LOCK(stcb); 1014 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1015 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1016 /* assoc was freed while we were unlocked */ 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018 return; 1019 } 1020#endif 1021 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1022#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1023 SCTP_SOCKET_UNLOCK(so, 1); 1024#endif 1025 } 1026#ifdef INVARIANTS 1027 if (!TAILQ_EMPTY(&asoc->send_queue) || 1028 !TAILQ_EMPTY(&asoc->sent_queue) || 1029 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1030 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1031 } 1032#endif 1033 /* stop the timer */ 1034 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1036 /* send SHUTDOWN-COMPLETE */ 1037 sctp_send_shutdown_complete(stcb, net, 0); 1038 /* notify upper layer protocol */ 1039 if (stcb->sctp_socket) { 1040 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1041 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1042 stcb->sctp_socket->so_snd.sb_cc = 0; 1043 } 1044 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1045 } 1046 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1047 /* free the TCB but first save off the ep */ 1048#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1049 atomic_add_int(&stcb->asoc.refcnt, 1); 1050 SCTP_TCB_UNLOCK(stcb); 1051 SCTP_SOCKET_LOCK(so, 1); 1052 SCTP_TCB_LOCK(stcb); 1053 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1054#endif 1055 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1057#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1058 SCTP_SOCKET_UNLOCK(so, 1); 1059#endif 1060} 1061 1062/* 1063 * Skip past the param header and then we will find the chunk that caused the 1064 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1065 * our peer must be broken. 1066 */ 1067static void 1068sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1069 struct sctp_nets *net) 1070{ 1071 struct sctp_chunkhdr *chk; 1072 1073 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1074 switch (chk->chunk_type) { 1075 case SCTP_ASCONF_ACK: 1076 case SCTP_ASCONF: 1077 sctp_asconf_cleanup(stcb, net); 1078 break; 1079 case SCTP_FORWARD_CUM_TSN: 1080 stcb->asoc.prsctp_supported = 0; 1081 break; 1082 default: 1083 SCTPDBG(SCTP_DEBUG_INPUT2, 1084 "Peer does not support chunk type %d(%x)??\n", 1085 chk->chunk_type, (uint32_t) chk->chunk_type); 1086 break; 1087 } 1088} 1089 1090/* 1091 * Skip past the param header and then we will find the param that caused the 1092 * problem. There are a number of param's in a ASCONF OR the prsctp param 1093 * these will turn of specific features. 1094 * XXX: Is this the right thing to do? 1095 */ 1096static void 1097sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1098{ 1099 struct sctp_paramhdr *pbad; 1100 1101 pbad = phdr + 1; 1102 switch (ntohs(pbad->param_type)) { 1103 /* pr-sctp draft */ 1104 case SCTP_PRSCTP_SUPPORTED: 1105 stcb->asoc.prsctp_supported = 0; 1106 break; 1107 case SCTP_SUPPORTED_CHUNK_EXT: 1108 break; 1109 /* draft-ietf-tsvwg-addip-sctp */ 1110 case SCTP_HAS_NAT_SUPPORT: 1111 stcb->asoc.peer_supports_nat = 0; 1112 break; 1113 case SCTP_ADD_IP_ADDRESS: 1114 case SCTP_DEL_IP_ADDRESS: 1115 case SCTP_SET_PRIM_ADDR: 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 case SCTP_SUCCESS_REPORT: 1119 case SCTP_ERROR_CAUSE_IND: 1120 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1121 SCTPDBG(SCTP_DEBUG_INPUT2, 1122 "Turning off ASCONF to this strange peer\n"); 1123 stcb->asoc.asconf_supported = 0; 1124 break; 1125 default: 1126 SCTPDBG(SCTP_DEBUG_INPUT2, 1127 "Peer does not support param type %d(%x)??\n", 1128 pbad->param_type, (uint32_t) pbad->param_type); 1129 break; 1130 } 1131} 1132 1133static int 1134sctp_handle_error(struct sctp_chunkhdr *ch, 1135 struct sctp_tcb *stcb, struct sctp_nets *net) 1136{ 1137 int chklen; 1138 struct sctp_paramhdr *phdr; 1139 uint16_t error, error_type; 1140 uint16_t error_len; 1141 struct sctp_association *asoc; 1142 int adjust; 1143 1144#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1145 struct socket *so; 1146 1147#endif 1148 1149 /* parse through all of the errors and process */ 1150 asoc = &stcb->asoc; 1151 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1152 sizeof(struct sctp_chunkhdr)); 1153 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1154 error = 0; 1155 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1156 /* Process an Error Cause */ 1157 error_type = ntohs(phdr->param_type); 1158 error_len = ntohs(phdr->param_length); 1159 if ((error_len > chklen) || (error_len == 0)) { 1160 /* invalid param length for this param */ 1161 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1162 chklen, error_len); 1163 return (0); 1164 } 1165 if (error == 0) { 1166 /* report the first error cause */ 1167 error = error_type; 1168 } 1169 switch (error_type) { 1170 case SCTP_CAUSE_INVALID_STREAM: 1171 case SCTP_CAUSE_MISSING_PARAM: 1172 case SCTP_CAUSE_INVALID_PARAM: 1173 case SCTP_CAUSE_NO_USER_DATA: 1174 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1175 error_type); 1176 break; 1177 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_colliding_state(stcb)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_NAT_MISSING_STATE: 1185 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1186 ch->chunk_flags); 1187 if (sctp_handle_nat_missing_state(stcb, net)) { 1188 return (0); 1189 } 1190 break; 1191 case SCTP_CAUSE_STALE_COOKIE: 1192 /* 1193 * We only act if we have echoed a cookie and are 1194 * waiting. 1195 */ 1196 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1197 int *p; 1198 1199 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1200 /* Save the time doubled */ 1201 asoc->cookie_preserve_req = ntohl(*p) << 1; 1202 asoc->stale_cookie_count++; 1203 if (asoc->stale_cookie_count > 1204 asoc->max_init_times) { 1205 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1206 /* now free the asoc */ 1207#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1208 so = SCTP_INP_SO(stcb->sctp_ep); 1209 atomic_add_int(&stcb->asoc.refcnt, 1); 1210 SCTP_TCB_UNLOCK(stcb); 1211 SCTP_SOCKET_LOCK(so, 1); 1212 SCTP_TCB_LOCK(stcb); 1213 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1214#endif 1215 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1216 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1217#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1218 SCTP_SOCKET_UNLOCK(so, 1); 1219#endif 1220 return (-1); 1221 } 1222 /* blast back to INIT state */ 1223 sctp_toss_old_cookies(stcb, &stcb->asoc); 1224 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1225 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1226 sctp_stop_all_cookie_timers(stcb); 1227 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1228 } 1229 break; 1230 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1231 /* 1232 * Nothing we can do here, we don't do hostname 1233 * addresses so if the peer does not like my IPv6 1234 * (or IPv4 for that matter) it does not matter. If 1235 * they don't support that type of address, they can 1236 * NOT possibly get that packet type... i.e. with no 1237 * IPv6 you can't recieve a IPv6 packet. so we can 1238 * safely ignore this one. If we ever added support 1239 * for HOSTNAME Addresses, then we would need to do 1240 * something here. 1241 */ 1242 break; 1243 case SCTP_CAUSE_UNRECOG_CHUNK: 1244 sctp_process_unrecog_chunk(stcb, phdr, net); 1245 break; 1246 case SCTP_CAUSE_UNRECOG_PARAM: 1247 sctp_process_unrecog_param(stcb, phdr); 1248 break; 1249 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1250 /* 1251 * We ignore this since the timer will drive out a 1252 * new cookie anyway and there timer will drive us 1253 * to send a SHUTDOWN_COMPLETE. We can't send one 1254 * here since we don't have their tag. 1255 */ 1256 break; 1257 case SCTP_CAUSE_DELETING_LAST_ADDR: 1258 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1259 case SCTP_CAUSE_DELETING_SRC_ADDR: 1260 /* 1261 * We should NOT get these here, but in a 1262 * ASCONF-ACK. 1263 */ 1264 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1265 error_type); 1266 break; 1267 case SCTP_CAUSE_OUT_OF_RESC: 1268 /* 1269 * And what, pray tell do we do with the fact that 1270 * the peer is out of resources? Not really sure we 1271 * could do anything but abort. I suspect this 1272 * should have came WITH an abort instead of in a 1273 * OP-ERROR. 1274 */ 1275 break; 1276 default: 1277 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1278 error_type); 1279 break; 1280 } 1281 adjust = SCTP_SIZE32(error_len); 1282 chklen -= adjust; 1283 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1284 } 1285 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1286 return (0); 1287} 1288 1289static int 1290sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1291 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1292 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1293 struct sctp_nets *net, int *abort_no_unlock, 1294 uint8_t mflowtype, uint32_t mflowid, 1295 uint32_t vrf_id) 1296{ 1297 struct sctp_init_ack *init_ack; 1298 struct mbuf *op_err; 1299 1300 SCTPDBG(SCTP_DEBUG_INPUT2, 1301 "sctp_handle_init_ack: handling INIT-ACK\n"); 1302 1303 if (stcb == NULL) { 1304 SCTPDBG(SCTP_DEBUG_INPUT2, 1305 "sctp_handle_init_ack: TCB is null\n"); 1306 return (-1); 1307 } 1308 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1309 /* Invalid length */ 1310 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1311 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1312 src, dst, sh, op_err, 1313 mflowtype, mflowid, 1314 vrf_id, net->port); 1315 *abort_no_unlock = 1; 1316 return (-1); 1317 } 1318 init_ack = &cp->init; 1319 /* validate parameters */ 1320 if (init_ack->initiate_tag == 0) { 1321 /* protocol error... send an abort */ 1322 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1323 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1324 src, dst, sh, op_err, 1325 mflowtype, mflowid, 1326 vrf_id, net->port); 1327 *abort_no_unlock = 1; 1328 return (-1); 1329 } 1330 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1331 /* protocol error... send an abort */ 1332 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1333 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1334 src, dst, sh, op_err, 1335 mflowtype, mflowid, 1336 vrf_id, net->port); 1337 *abort_no_unlock = 1; 1338 return (-1); 1339 } 1340 if (init_ack->num_inbound_streams == 0) { 1341 /* protocol error... send an abort */ 1342 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1343 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1344 src, dst, sh, op_err, 1345 mflowtype, mflowid, 1346 vrf_id, net->port); 1347 *abort_no_unlock = 1; 1348 return (-1); 1349 } 1350 if (init_ack->num_outbound_streams == 0) { 1351 /* protocol error... send an abort */ 1352 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1353 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1354 src, dst, sh, op_err, 1355 mflowtype, mflowid, 1356 vrf_id, net->port); 1357 *abort_no_unlock = 1; 1358 return (-1); 1359 } 1360 /* process according to association state... */ 1361 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1362 case SCTP_STATE_COOKIE_WAIT: 1363 /* this is the expected state for this chunk */ 1364 /* process the INIT-ACK parameters */ 1365 if (stcb->asoc.primary_destination->dest_state & 1366 SCTP_ADDR_UNCONFIRMED) { 1367 /* 1368 * The primary is where we sent the INIT, we can 1369 * always consider it confirmed when the INIT-ACK is 1370 * returned. Do this before we load addresses 1371 * though. 1372 */ 1373 stcb->asoc.primary_destination->dest_state &= 1374 ~SCTP_ADDR_UNCONFIRMED; 1375 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1376 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1377 } 1378 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1379 net, abort_no_unlock, 1380 mflowtype, mflowid, 1381 vrf_id) < 0) { 1382 /* error in parsing parameters */ 1383 return (-1); 1384 } 1385 /* update our state */ 1386 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1387 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1388 1389 /* reset the RTO calc */ 1390 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1391 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1392 stcb->asoc.overall_error_count, 1393 0, 1394 SCTP_FROM_SCTP_INPUT, 1395 __LINE__); 1396 } 1397 stcb->asoc.overall_error_count = 0; 1398 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1399 /* 1400 * collapse the init timer back in case of a exponential 1401 * backoff 1402 */ 1403 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1404 stcb, net); 1405 /* 1406 * the send at the end of the inbound data processing will 1407 * cause the cookie to be sent 1408 */ 1409 break; 1410 case SCTP_STATE_SHUTDOWN_SENT: 1411 /* incorrect state... discard */ 1412 break; 1413 case SCTP_STATE_COOKIE_ECHOED: 1414 /* incorrect state... discard */ 1415 break; 1416 case SCTP_STATE_OPEN: 1417 /* incorrect state... discard */ 1418 break; 1419 case SCTP_STATE_EMPTY: 1420 case SCTP_STATE_INUSE: 1421 default: 1422 /* incorrect state... discard */ 1423 return (-1); 1424 break; 1425 } 1426 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1427 return (0); 1428} 1429 1430static struct sctp_tcb * 1431sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1432 struct sockaddr *src, struct sockaddr *dst, 1433 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1434 struct sctp_inpcb *inp, struct sctp_nets **netp, 1435 struct sockaddr *init_src, int *notification, 1436 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1437 uint8_t mflowtype, uint32_t mflowid, 1438 uint32_t vrf_id, uint16_t port); 1439 1440 1441/* 1442 * handle a state cookie for an existing association m: input packet mbuf 1443 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1444 * "split" mbuf and the cookie signature does not exist offset: offset into 1445 * mbuf to the cookie-echo chunk 1446 */ 1447static struct sctp_tcb * 1448sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1449 struct sockaddr *src, struct sockaddr *dst, 1450 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1451 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1452 struct sockaddr *init_src, int *notification, 1453 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1454 uint8_t mflowtype, uint32_t mflowid, 1455 uint32_t vrf_id, uint16_t port) 1456{ 1457 struct sctp_association *asoc; 1458 struct sctp_init_chunk *init_cp, init_buf; 1459 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1460 struct sctp_nets *net; 1461 struct mbuf *op_err; 1462 int init_offset, initack_offset, i; 1463 int retval; 1464 int spec_flag = 0; 1465 uint32_t how_indx; 1466 1467#if defined(SCTP_DETAILED_STR_STATS) 1468 int j; 1469 1470#endif 1471 1472 net = *netp; 1473 /* I know that the TCB is non-NULL from the caller */ 1474 asoc = &stcb->asoc; 1475 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1476 if (asoc->cookie_how[how_indx] == 0) 1477 break; 1478 } 1479 if (how_indx < sizeof(asoc->cookie_how)) { 1480 asoc->cookie_how[how_indx] = 1; 1481 } 1482 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1483 /* SHUTDOWN came in after sending INIT-ACK */ 1484 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1485 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1486 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1487 mflowtype, mflowid, inp->fibnum, 1488 vrf_id, net->port); 1489 if (how_indx < sizeof(asoc->cookie_how)) 1490 asoc->cookie_how[how_indx] = 2; 1491 return (NULL); 1492 } 1493 /* 1494 * find and validate the INIT chunk in the cookie (peer's info) the 1495 * INIT should start after the cookie-echo header struct (chunk 1496 * header, state cookie header struct) 1497 */ 1498 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1499 1500 init_cp = (struct sctp_init_chunk *) 1501 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1502 (uint8_t *) & init_buf); 1503 if (init_cp == NULL) { 1504 /* could not pull a INIT chunk in cookie */ 1505 return (NULL); 1506 } 1507 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1508 return (NULL); 1509 } 1510 /* 1511 * find and validate the INIT-ACK chunk in the cookie (my info) the 1512 * INIT-ACK follows the INIT chunk 1513 */ 1514 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1515 initack_cp = (struct sctp_init_ack_chunk *) 1516 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1517 (uint8_t *) & initack_buf); 1518 if (initack_cp == NULL) { 1519 /* could not pull INIT-ACK chunk in cookie */ 1520 return (NULL); 1521 } 1522 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1523 return (NULL); 1524 } 1525 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1526 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1527 /* 1528 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1529 * to get into the OPEN state 1530 */ 1531 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1532 /*- 1533 * Opps, this means that we somehow generated two vtag's 1534 * the same. I.e. we did: 1535 * Us Peer 1536 * <---INIT(tag=a)------ 1537 * ----INIT-ACK(tag=t)--> 1538 * ----INIT(tag=t)------> *1 1539 * <---INIT-ACK(tag=a)--- 1540 * <----CE(tag=t)------------- *2 1541 * 1542 * At point *1 we should be generating a different 1543 * tag t'. Which means we would throw away the CE and send 1544 * ours instead. Basically this is case C (throw away side). 1545 */ 1546 if (how_indx < sizeof(asoc->cookie_how)) 1547 asoc->cookie_how[how_indx] = 17; 1548 return (NULL); 1549 1550 } 1551 switch (SCTP_GET_STATE(asoc)) { 1552 case SCTP_STATE_COOKIE_WAIT: 1553 case SCTP_STATE_COOKIE_ECHOED: 1554 /* 1555 * INIT was sent but got a COOKIE_ECHO with the 1556 * correct tags... just accept it...but we must 1557 * process the init so that we can make sure we have 1558 * the right seq no's. 1559 */ 1560 /* First we must process the INIT !! */ 1561 retval = sctp_process_init(init_cp, stcb); 1562 if (retval < 0) { 1563 if (how_indx < sizeof(asoc->cookie_how)) 1564 asoc->cookie_how[how_indx] = 3; 1565 return (NULL); 1566 } 1567 /* we have already processed the INIT so no problem */ 1568 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1569 stcb, net, 1570 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1571 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1572 stcb, net, 1573 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1574 /* update current state */ 1575 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1576 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1577 else 1578 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1579 1580 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1581 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1582 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1583 stcb->sctp_ep, stcb, asoc->primary_destination); 1584 } 1585 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1586 sctp_stop_all_cookie_timers(stcb); 1587 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1588 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1589 (inp->sctp_socket->so_qlimit == 0) 1590 ) { 1591#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1592 struct socket *so; 1593 1594#endif 1595 /* 1596 * Here is where collision would go if we 1597 * did a connect() and instead got a 1598 * init/init-ack/cookie done before the 1599 * init-ack came back.. 1600 */ 1601 stcb->sctp_ep->sctp_flags |= 1602 SCTP_PCB_FLAGS_CONNECTED; 1603#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1604 so = SCTP_INP_SO(stcb->sctp_ep); 1605 atomic_add_int(&stcb->asoc.refcnt, 1); 1606 SCTP_TCB_UNLOCK(stcb); 1607 SCTP_SOCKET_LOCK(so, 1); 1608 SCTP_TCB_LOCK(stcb); 1609 atomic_add_int(&stcb->asoc.refcnt, -1); 1610 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1611 SCTP_SOCKET_UNLOCK(so, 1); 1612 return (NULL); 1613 } 1614#endif 1615 soisconnected(stcb->sctp_socket); 1616#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1617 SCTP_SOCKET_UNLOCK(so, 1); 1618#endif 1619 } 1620 /* notify upper layer */ 1621 *notification = SCTP_NOTIFY_ASSOC_UP; 1622 /* 1623 * since we did not send a HB make sure we don't 1624 * double things 1625 */ 1626 net->hb_responded = 1; 1627 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1628 &cookie->time_entered, 1629 sctp_align_unsafe_makecopy, 1630 SCTP_RTT_FROM_NON_DATA); 1631 1632 if (stcb->asoc.sctp_autoclose_ticks && 1633 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1634 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1635 inp, stcb, NULL); 1636 } 1637 break; 1638 default: 1639 /* 1640 * we're in the OPEN state (or beyond), so peer must 1641 * have simply lost the COOKIE-ACK 1642 */ 1643 break; 1644 } /* end switch */ 1645 sctp_stop_all_cookie_timers(stcb); 1646 /* 1647 * We ignore the return code here.. not sure if we should 1648 * somehow abort.. but we do have an existing asoc. This 1649 * really should not fail. 1650 */ 1651 if (sctp_load_addresses_from_init(stcb, m, 1652 init_offset + sizeof(struct sctp_init_chunk), 1653 initack_offset, src, dst, init_src)) { 1654 if (how_indx < sizeof(asoc->cookie_how)) 1655 asoc->cookie_how[how_indx] = 4; 1656 return (NULL); 1657 } 1658 /* respond with a COOKIE-ACK */ 1659 sctp_toss_old_cookies(stcb, asoc); 1660 sctp_send_cookie_ack(stcb); 1661 if (how_indx < sizeof(asoc->cookie_how)) 1662 asoc->cookie_how[how_indx] = 5; 1663 return (stcb); 1664 } 1665 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1666 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1667 cookie->tie_tag_my_vtag == 0 && 1668 cookie->tie_tag_peer_vtag == 0) { 1669 /* 1670 * case C in Section 5.2.4 Table 2: XMOO silently discard 1671 */ 1672 if (how_indx < sizeof(asoc->cookie_how)) 1673 asoc->cookie_how[how_indx] = 6; 1674 return (NULL); 1675 } 1676 /* 1677 * If nat support, and the below and stcb is established, send back 1678 * a ABORT(colliding state) if we are established. 1679 */ 1680 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1681 (asoc->peer_supports_nat) && 1682 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1683 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1684 (asoc->peer_vtag == 0)))) { 1685 /* 1686 * Special case - Peer's support nat. We may have two init's 1687 * that we gave out the same tag on since one was not 1688 * established.. i.e. we get INIT from host-1 behind the nat 1689 * and we respond tag-a, we get a INIT from host-2 behind 1690 * the nat and we get tag-a again. Then we bring up host-1 1691 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1692 * Now we have colliding state. We must send an abort here 1693 * with colliding state indication. 1694 */ 1695 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1696 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1697 mflowtype, mflowid, inp->fibnum, 1698 vrf_id, port); 1699 return (NULL); 1700 } 1701 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1702 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1703 (asoc->peer_vtag == 0))) { 1704 /* 1705 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1706 * should be ok, re-accept peer info 1707 */ 1708 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1709 /* 1710 * Extension of case C. If we hit this, then the 1711 * random number generator returned the same vtag 1712 * when we first sent our INIT-ACK and when we later 1713 * sent our INIT. The side with the seq numbers that 1714 * are different will be the one that normnally 1715 * would have hit case C. This in effect "extends" 1716 * our vtags in this collision case to be 64 bits. 1717 * The same collision could occur aka you get both 1718 * vtag and seq number the same twice in a row.. but 1719 * is much less likely. If it did happen then we 1720 * would proceed through and bring up the assoc.. we 1721 * may end up with the wrong stream setup however.. 1722 * which would be bad.. but there is no way to 1723 * tell.. until we send on a stream that does not 1724 * exist :-) 1725 */ 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 7; 1728 1729 return (NULL); 1730 } 1731 if (how_indx < sizeof(asoc->cookie_how)) 1732 asoc->cookie_how[how_indx] = 8; 1733 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1734 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1735 sctp_stop_all_cookie_timers(stcb); 1736 /* 1737 * since we did not send a HB make sure we don't double 1738 * things 1739 */ 1740 net->hb_responded = 1; 1741 if (stcb->asoc.sctp_autoclose_ticks && 1742 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1743 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1744 NULL); 1745 } 1746 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1747 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1748 1749 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1750 /* 1751 * Ok the peer probably discarded our data (if we 1752 * echoed a cookie+data). So anything on the 1753 * sent_queue should be marked for retransmit, we 1754 * may not get something to kick us so it COULD 1755 * still take a timeout to move these.. but it can't 1756 * hurt to mark them. 1757 */ 1758 struct sctp_tmit_chunk *chk; 1759 1760 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1761 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1762 chk->sent = SCTP_DATAGRAM_RESEND; 1763 sctp_flight_size_decrease(chk); 1764 sctp_total_flight_decrease(stcb, chk); 1765 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1766 spec_flag++; 1767 } 1768 } 1769 1770 } 1771 /* process the INIT info (peer's info) */ 1772 retval = sctp_process_init(init_cp, stcb); 1773 if (retval < 0) { 1774 if (how_indx < sizeof(asoc->cookie_how)) 1775 asoc->cookie_how[how_indx] = 9; 1776 return (NULL); 1777 } 1778 if (sctp_load_addresses_from_init(stcb, m, 1779 init_offset + sizeof(struct sctp_init_chunk), 1780 initack_offset, src, dst, init_src)) { 1781 if (how_indx < sizeof(asoc->cookie_how)) 1782 asoc->cookie_how[how_indx] = 10; 1783 return (NULL); 1784 } 1785 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1786 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1787 *notification = SCTP_NOTIFY_ASSOC_UP; 1788 1789 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1790 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1791 (inp->sctp_socket->so_qlimit == 0)) { 1792#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1793 struct socket *so; 1794 1795#endif 1796 stcb->sctp_ep->sctp_flags |= 1797 SCTP_PCB_FLAGS_CONNECTED; 1798#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1799 so = SCTP_INP_SO(stcb->sctp_ep); 1800 atomic_add_int(&stcb->asoc.refcnt, 1); 1801 SCTP_TCB_UNLOCK(stcb); 1802 SCTP_SOCKET_LOCK(so, 1); 1803 SCTP_TCB_LOCK(stcb); 1804 atomic_add_int(&stcb->asoc.refcnt, -1); 1805 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1806 SCTP_SOCKET_UNLOCK(so, 1); 1807 return (NULL); 1808 } 1809#endif 1810 soisconnected(stcb->sctp_socket); 1811#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1812 SCTP_SOCKET_UNLOCK(so, 1); 1813#endif 1814 } 1815 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1816 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1817 else 1818 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1819 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1820 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1821 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1822 } else { 1823 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1824 } 1825 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1826 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1827 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1828 stcb->sctp_ep, stcb, asoc->primary_destination); 1829 } 1830 sctp_stop_all_cookie_timers(stcb); 1831 sctp_toss_old_cookies(stcb, asoc); 1832 sctp_send_cookie_ack(stcb); 1833 if (spec_flag) { 1834 /* 1835 * only if we have retrans set do we do this. What 1836 * this call does is get only the COOKIE-ACK out and 1837 * then when we return the normal call to 1838 * sctp_chunk_output will get the retrans out behind 1839 * this. 1840 */ 1841 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1842 } 1843 if (how_indx < sizeof(asoc->cookie_how)) 1844 asoc->cookie_how[how_indx] = 11; 1845 1846 return (stcb); 1847 } 1848 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1849 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1850 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1851 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1852 cookie->tie_tag_peer_vtag != 0) { 1853 struct sctpasochead *head; 1854 1855#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1856 struct socket *so; 1857 1858#endif 1859 1860 if (asoc->peer_supports_nat) { 1861 /* 1862 * This is a gross gross hack. Just call the 1863 * cookie_new code since we are allowing a duplicate 1864 * association. I hope this works... 1865 */ 1866 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1867 sh, cookie, cookie_len, 1868 inp, netp, init_src, notification, 1869 auth_skipped, auth_offset, auth_len, 1870 mflowtype, mflowid, 1871 vrf_id, port)); 1872 } 1873 /* 1874 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1875 */ 1876 /* temp code */ 1877 if (how_indx < sizeof(asoc->cookie_how)) 1878 asoc->cookie_how[how_indx] = 12; 1879 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1880 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1881 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1882 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1883 1884 /* notify upper layer */ 1885 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1886 atomic_add_int(&stcb->asoc.refcnt, 1); 1887 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1888 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1889 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1890 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1891 } 1892 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1893 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1894 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1895 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1896 } 1897 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1898 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1899 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1900 stcb->sctp_ep, stcb, asoc->primary_destination); 1901 1902 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1903 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1904 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1905 } 1906 asoc->pre_open_streams = 1907 ntohs(initack_cp->init.num_outbound_streams); 1908 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1909 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1910 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1911 1912 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1913 1914 asoc->str_reset_seq_in = asoc->init_seq_number; 1915 1916 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1917 if (asoc->mapping_array) { 1918 memset(asoc->mapping_array, 0, 1919 asoc->mapping_array_size); 1920 } 1921 if (asoc->nr_mapping_array) { 1922 memset(asoc->nr_mapping_array, 0, 1923 asoc->mapping_array_size); 1924 } 1925 SCTP_TCB_UNLOCK(stcb); 1926#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1927 so = SCTP_INP_SO(stcb->sctp_ep); 1928 SCTP_SOCKET_LOCK(so, 1); 1929#endif 1930 SCTP_INP_INFO_WLOCK(); 1931 SCTP_INP_WLOCK(stcb->sctp_ep); 1932 SCTP_TCB_LOCK(stcb); 1933 atomic_add_int(&stcb->asoc.refcnt, -1); 1934 /* send up all the data */ 1935 SCTP_TCB_SEND_LOCK(stcb); 1936 1937 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1938 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1939 stcb->asoc.strmout[i].chunks_on_queues = 0; 1940#if defined(SCTP_DETAILED_STR_STATS) 1941 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1942 asoc->strmout[i].abandoned_sent[j] = 0; 1943 asoc->strmout[i].abandoned_unsent[j] = 0; 1944 } 1945#else 1946 asoc->strmout[i].abandoned_sent[0] = 0; 1947 asoc->strmout[i].abandoned_unsent[0] = 0; 1948#endif 1949 stcb->asoc.strmout[i].stream_no = i; 1950 stcb->asoc.strmout[i].next_sequence_send = 0; 1951 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1952 } 1953 /* process the INIT-ACK info (my info) */ 1954 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1955 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1956 1957 /* pull from vtag hash */ 1958 LIST_REMOVE(stcb, sctp_asocs); 1959 /* re-insert to new vtag position */ 1960 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1961 SCTP_BASE_INFO(hashasocmark))]; 1962 /* 1963 * put it in the bucket in the vtag hash of assoc's for the 1964 * system 1965 */ 1966 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1967 1968 SCTP_TCB_SEND_UNLOCK(stcb); 1969 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1970 SCTP_INP_INFO_WUNLOCK(); 1971#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1972 SCTP_SOCKET_UNLOCK(so, 1); 1973#endif 1974 asoc->total_flight = 0; 1975 asoc->total_flight_count = 0; 1976 /* process the INIT info (peer's info) */ 1977 retval = sctp_process_init(init_cp, stcb); 1978 if (retval < 0) { 1979 if (how_indx < sizeof(asoc->cookie_how)) 1980 asoc->cookie_how[how_indx] = 13; 1981 1982 return (NULL); 1983 } 1984 /* 1985 * since we did not send a HB make sure we don't double 1986 * things 1987 */ 1988 net->hb_responded = 1; 1989 1990 if (sctp_load_addresses_from_init(stcb, m, 1991 init_offset + sizeof(struct sctp_init_chunk), 1992 initack_offset, src, dst, init_src)) { 1993 if (how_indx < sizeof(asoc->cookie_how)) 1994 asoc->cookie_how[how_indx] = 14; 1995 1996 return (NULL); 1997 } 1998 /* respond with a COOKIE-ACK */ 1999 sctp_stop_all_cookie_timers(stcb); 2000 sctp_toss_old_cookies(stcb, asoc); 2001 sctp_send_cookie_ack(stcb); 2002 if (how_indx < sizeof(asoc->cookie_how)) 2003 asoc->cookie_how[how_indx] = 15; 2004 2005 return (stcb); 2006 } 2007 if (how_indx < sizeof(asoc->cookie_how)) 2008 asoc->cookie_how[how_indx] = 16; 2009 /* all other cases... */ 2010 return (NULL); 2011} 2012 2013 2014/* 2015 * handle a state cookie for a new association m: input packet mbuf chain-- 2016 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2017 * and the cookie signature does not exist offset: offset into mbuf to the 2018 * cookie-echo chunk length: length of the cookie chunk to: where the init 2019 * was from returns a new TCB 2020 */ 2021static struct sctp_tcb * 2022sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2023 struct sockaddr *src, struct sockaddr *dst, 2024 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2025 struct sctp_inpcb *inp, struct sctp_nets **netp, 2026 struct sockaddr *init_src, int *notification, 2027 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2028 uint8_t mflowtype, uint32_t mflowid, 2029 uint32_t vrf_id, uint16_t port) 2030{ 2031 struct sctp_tcb *stcb; 2032 struct sctp_init_chunk *init_cp, init_buf; 2033 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2034 union sctp_sockstore store; 2035 struct sctp_association *asoc; 2036 int init_offset, initack_offset, initack_limit; 2037 int retval; 2038 int error = 0; 2039 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2040 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_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2112 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2113 src, dst, sh, op_err, 2114 mflowtype, mflowid, 2115 vrf_id, port); 2116 return (NULL); 2117 } 2118 /* get the correct sctp_nets */ 2119 if (netp) 2120 *netp = sctp_findnet(stcb, init_src); 2121 2122 asoc = &stcb->asoc; 2123 /* get scope variables out of cookie */ 2124 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2125 asoc->scope.site_scope = cookie->site_scope; 2126 asoc->scope.local_scope = cookie->local_scope; 2127 asoc->scope.loopback_scope = cookie->loopback_scope; 2128 2129 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2130 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2131 struct mbuf *op_err; 2132 2133 /* 2134 * Houston we have a problem. The EP changed while the 2135 * cookie was in flight. Only recourse is to abort the 2136 * association. 2137 */ 2138 atomic_add_int(&stcb->asoc.refcnt, 1); 2139 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2140 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2141 src, dst, sh, op_err, 2142 mflowtype, mflowid, 2143 vrf_id, port); 2144#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2145 SCTP_TCB_UNLOCK(stcb); 2146 SCTP_SOCKET_LOCK(so, 1); 2147 SCTP_TCB_LOCK(stcb); 2148#endif 2149 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2150 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2151#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2152 SCTP_SOCKET_UNLOCK(so, 1); 2153#endif 2154 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2155 return (NULL); 2156 } 2157 /* process the INIT-ACK info (my info) */ 2158 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2159 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2160 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2161 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2162 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2163 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2164 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2165 asoc->str_reset_seq_in = asoc->init_seq_number; 2166 2167 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2168 2169 /* process the INIT info (peer's info) */ 2170 if (netp) 2171 retval = sctp_process_init(init_cp, stcb); 2172 else 2173 retval = 0; 2174 if (retval < 0) { 2175 atomic_add_int(&stcb->asoc.refcnt, 1); 2176#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2177 SCTP_TCB_UNLOCK(stcb); 2178 SCTP_SOCKET_LOCK(so, 1); 2179 SCTP_TCB_LOCK(stcb); 2180#endif 2181 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2182 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 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, 2200 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2201#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2202 SCTP_SOCKET_UNLOCK(so, 1); 2203#endif 2204 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2205 return (NULL); 2206 } 2207 /* 2208 * verify any preceding AUTH chunk that was skipped 2209 */ 2210 /* pull the local authentication parameters from the cookie/init-ack */ 2211 sctp_auth_get_cookie_params(stcb, m, 2212 initack_offset + sizeof(struct sctp_init_ack_chunk), 2213 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2214 if (auth_skipped) { 2215 struct sctp_auth_chunk *auth; 2216 2217 auth = (struct sctp_auth_chunk *) 2218 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2219 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2220 /* auth HMAC failed, dump the assoc and packet */ 2221 SCTPDBG(SCTP_DEBUG_AUTH1, 2222 "COOKIE-ECHO: AUTH failed\n"); 2223 atomic_add_int(&stcb->asoc.refcnt, 1); 2224#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2225 SCTP_TCB_UNLOCK(stcb); 2226 SCTP_SOCKET_LOCK(so, 1); 2227 SCTP_TCB_LOCK(stcb); 2228#endif 2229 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2230 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2231#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2232 SCTP_SOCKET_UNLOCK(so, 1); 2233#endif 2234 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2235 return (NULL); 2236 } else { 2237 /* remaining chunks checked... good to go */ 2238 stcb->asoc.authenticated = 1; 2239 } 2240 } 2241 /* update current state */ 2242 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2243 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2244 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2245 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2246 stcb->sctp_ep, stcb, asoc->primary_destination); 2247 } 2248 sctp_stop_all_cookie_timers(stcb); 2249 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2250 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2251 2252 /* 2253 * if we're doing ASCONFs, check to see if we have any new local 2254 * addresses that need to get added to the peer (eg. addresses 2255 * changed while cookie echo in flight). This needs to be done 2256 * after we go to the OPEN state to do the correct asconf 2257 * processing. else, make sure we have the correct addresses in our 2258 * lists 2259 */ 2260 2261 /* warning, we re-use sin, sin6, sa_store here! */ 2262 /* pull in local_address (our "from" address) */ 2263 switch (cookie->laddr_type) { 2264#ifdef INET 2265 case SCTP_IPV4_ADDRESS: 2266 /* source addr is IPv4 */ 2267 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2268 store.sin.sin_family = AF_INET; 2269 store.sin.sin_len = sizeof(struct sockaddr_in); 2270 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2271 break; 2272#endif 2273#ifdef INET6 2274 case SCTP_IPV6_ADDRESS: 2275 /* source addr is IPv6 */ 2276 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2277 store.sin6.sin6_family = AF_INET6; 2278 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2279 store.sin6.sin6_scope_id = cookie->scope_id; 2280 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2281 break; 2282#endif 2283 default: 2284 atomic_add_int(&stcb->asoc.refcnt, 1); 2285#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2286 SCTP_TCB_UNLOCK(stcb); 2287 SCTP_SOCKET_LOCK(so, 1); 2288 SCTP_TCB_LOCK(stcb); 2289#endif 2290 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2291 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 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 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2346 if ((netp) && (*netp)) { 2347 /* calculate the RTT and set the encaps port */ 2348 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2349 &cookie->time_entered, sctp_align_unsafe_makecopy, 2350 SCTP_RTT_FROM_NON_DATA); 2351 (*netp)->port = port; 2352 } 2353 /* respond with a COOKIE-ACK */ 2354 sctp_send_cookie_ack(stcb); 2355 2356 /* 2357 * check the address lists for any ASCONFs that need to be sent 2358 * AFTER the cookie-ack is sent 2359 */ 2360 sctp_check_address_list(stcb, m, 2361 initack_offset + sizeof(struct sctp_init_ack_chunk), 2362 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2363 &store.sa, cookie->local_scope, cookie->site_scope, 2364 cookie->ipv4_scope, cookie->loopback_scope); 2365 2366 2367 return (stcb); 2368} 2369 2370/* 2371 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2372 * we NEED to make sure we are not already using the vtag. If so we 2373 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2374 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2375 SCTP_BASE_INFO(hashasocmark))]; 2376 LIST_FOREACH(stcb, head, sctp_asocs) { 2377 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2378 -- SEND ABORT - TRY AGAIN -- 2379 } 2380 } 2381*/ 2382 2383/* 2384 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2385 * existing (non-NULL) TCB 2386 */ 2387static struct mbuf * 2388sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2389 struct sockaddr *src, struct sockaddr *dst, 2390 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2391 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2392 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2393 struct sctp_tcb **locked_tcb, 2394 uint8_t mflowtype, uint32_t mflowid, 2395 uint32_t vrf_id, uint16_t port) 2396{ 2397 struct sctp_state_cookie *cookie; 2398 struct sctp_tcb *l_stcb = *stcb; 2399 struct sctp_inpcb *l_inp; 2400 struct sockaddr *to; 2401 struct sctp_pcb *ep; 2402 struct mbuf *m_sig; 2403 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2404 uint8_t *sig; 2405 uint8_t cookie_ok = 0; 2406 unsigned int sig_offset, cookie_offset; 2407 unsigned int cookie_len; 2408 struct timeval now; 2409 struct timeval time_expires; 2410 int notification = 0; 2411 struct sctp_nets *netl; 2412 int had_a_existing_tcb = 0; 2413 int send_int_conf = 0; 2414 2415#ifdef INET 2416 struct sockaddr_in sin; 2417 2418#endif 2419#ifdef INET6 2420 struct sockaddr_in6 sin6; 2421 2422#endif 2423 2424 SCTPDBG(SCTP_DEBUG_INPUT2, 2425 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2426 2427 if (inp_p == NULL) { 2428 return (NULL); 2429 } 2430 cookie = &cp->cookie; 2431 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2432 cookie_len = ntohs(cp->ch.chunk_length); 2433 2434 if ((cookie->peerport != sh->src_port) && 2435 (cookie->myport != sh->dest_port) && 2436 (cookie->my_vtag != sh->v_tag)) { 2437 /* 2438 * invalid ports or bad tag. Note that we always leave the 2439 * v_tag in the header in network order and when we stored 2440 * it in the my_vtag slot we also left it in network order. 2441 * This maintains the match even though it may be in the 2442 * opposite byte order of the machine :-> 2443 */ 2444 return (NULL); 2445 } 2446 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2447 sizeof(struct sctp_init_chunk) + 2448 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2449 /* cookie too small */ 2450 return (NULL); 2451 } 2452 /* 2453 * split off the signature into its own mbuf (since it should not be 2454 * calculated in the sctp_hmac_m() call). 2455 */ 2456 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2457 m_sig = m_split(m, sig_offset, M_NOWAIT); 2458 if (m_sig == NULL) { 2459 /* out of memory or ?? */ 2460 return (NULL); 2461 } 2462#ifdef SCTP_MBUF_LOGGING 2463 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2464 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2465 } 2466#endif 2467 2468 /* 2469 * compute the signature/digest for the cookie 2470 */ 2471 ep = &(*inp_p)->sctp_ep; 2472 l_inp = *inp_p; 2473 if (l_stcb) { 2474 SCTP_TCB_UNLOCK(l_stcb); 2475 } 2476 SCTP_INP_RLOCK(l_inp); 2477 if (l_stcb) { 2478 SCTP_TCB_LOCK(l_stcb); 2479 } 2480 /* which cookie is it? */ 2481 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2482 (ep->current_secret_number != ep->last_secret_number)) { 2483 /* it's the old cookie */ 2484 (void)sctp_hmac_m(SCTP_HMAC, 2485 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2486 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2487 } else { 2488 /* it's the current cookie */ 2489 (void)sctp_hmac_m(SCTP_HMAC, 2490 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2491 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2492 } 2493 /* get the signature */ 2494 SCTP_INP_RUNLOCK(l_inp); 2495 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2496 if (sig == NULL) { 2497 /* couldn't find signature */ 2498 sctp_m_freem(m_sig); 2499 return (NULL); 2500 } 2501 /* compare the received digest with the computed digest */ 2502 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2503 /* try the old cookie? */ 2504 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2505 (ep->current_secret_number != ep->last_secret_number)) { 2506 /* compute digest with old */ 2507 (void)sctp_hmac_m(SCTP_HMAC, 2508 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2509 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2510 /* compare */ 2511 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2512 cookie_ok = 1; 2513 } 2514 } else { 2515 cookie_ok = 1; 2516 } 2517 2518 /* 2519 * Now before we continue we must reconstruct our mbuf so that 2520 * normal processing of any other chunks will work. 2521 */ 2522 { 2523 struct mbuf *m_at; 2524 2525 m_at = m; 2526 while (SCTP_BUF_NEXT(m_at) != NULL) { 2527 m_at = SCTP_BUF_NEXT(m_at); 2528 } 2529 SCTP_BUF_NEXT(m_at) = m_sig; 2530 } 2531 2532 if (cookie_ok == 0) { 2533 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2534 SCTPDBG(SCTP_DEBUG_INPUT2, 2535 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2536 (uint32_t) offset, cookie_offset, sig_offset); 2537 return (NULL); 2538 } 2539 /* 2540 * check the cookie timestamps to be sure it's not stale 2541 */ 2542 (void)SCTP_GETTIME_TIMEVAL(&now); 2543 /* Expire time is in Ticks, so we convert to seconds */ 2544 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2545 time_expires.tv_usec = cookie->time_entered.tv_usec; 2546 /* 2547 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2548 * is undefined. 2549 */ 2550 if (timevalcmp(&now, &time_expires, >)) { 2551 /* cookie is stale! */ 2552 struct mbuf *op_err; 2553 struct sctp_stale_cookie_msg *scm; 2554 uint32_t tim; 2555 2556 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2557 0, M_NOWAIT, 1, MT_DATA); 2558 if (op_err == NULL) { 2559 /* FOOBAR */ 2560 return (NULL); 2561 } 2562 /* Set the len */ 2563 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2564 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2565 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2566 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2567 (sizeof(uint32_t)))); 2568 /* seconds to usec */ 2569 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2570 /* add in usec */ 2571 if (tim == 0) 2572 tim = now.tv_usec - cookie->time_entered.tv_usec; 2573 scm->time_usec = htonl(tim); 2574 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2575 mflowtype, mflowid, l_inp->fibnum, 2576 vrf_id, port); 2577 return (NULL); 2578 } 2579 /* 2580 * Now we must see with the lookup address if we have an existing 2581 * asoc. This will only happen if we were in the COOKIE-WAIT state 2582 * and a INIT collided with us and somewhere the peer sent the 2583 * cookie on another address besides the single address our assoc 2584 * had for him. In this case we will have one of the tie-tags set at 2585 * least AND the address field in the cookie can be used to look it 2586 * up. 2587 */ 2588 to = NULL; 2589 switch (cookie->addr_type) { 2590#ifdef INET6 2591 case SCTP_IPV6_ADDRESS: 2592 memset(&sin6, 0, sizeof(sin6)); 2593 sin6.sin6_family = AF_INET6; 2594 sin6.sin6_len = sizeof(sin6); 2595 sin6.sin6_port = sh->src_port; 2596 sin6.sin6_scope_id = cookie->scope_id; 2597 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2598 sizeof(sin6.sin6_addr.s6_addr)); 2599 to = (struct sockaddr *)&sin6; 2600 break; 2601#endif 2602#ifdef INET 2603 case SCTP_IPV4_ADDRESS: 2604 memset(&sin, 0, sizeof(sin)); 2605 sin.sin_family = AF_INET; 2606 sin.sin_len = sizeof(sin); 2607 sin.sin_port = sh->src_port; 2608 sin.sin_addr.s_addr = cookie->address[0]; 2609 to = (struct sockaddr *)&sin; 2610 break; 2611#endif 2612 default: 2613 /* This should not happen */ 2614 return (NULL); 2615 } 2616 if (*stcb == NULL) { 2617 /* Yep, lets check */ 2618 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2619 if (*stcb == NULL) { 2620 /* 2621 * We should have only got back the same inp. If we 2622 * got back a different ep we have a problem. The 2623 * original findep got back l_inp and now 2624 */ 2625 if (l_inp != *inp_p) { 2626 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2627 } 2628 } else { 2629 if (*locked_tcb == NULL) { 2630 /* 2631 * In this case we found the assoc only 2632 * after we locked the create lock. This 2633 * means we are in a colliding case and we 2634 * must make sure that we unlock the tcb if 2635 * its one of the cases where we throw away 2636 * the incoming packets. 2637 */ 2638 *locked_tcb = *stcb; 2639 2640 /* 2641 * We must also increment the inp ref count 2642 * since the ref_count flags was set when we 2643 * did not find the TCB, now we found it 2644 * which reduces the refcount.. we must 2645 * raise it back out to balance it all :-) 2646 */ 2647 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2648 if ((*stcb)->sctp_ep != l_inp) { 2649 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2650 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2651 } 2652 } 2653 } 2654 } 2655 cookie_len -= SCTP_SIGNATURE_SIZE; 2656 if (*stcb == NULL) { 2657 /* this is the "normal" case... get a new TCB */ 2658 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2659 cookie, cookie_len, *inp_p, 2660 netp, to, ¬ification, 2661 auth_skipped, auth_offset, auth_len, 2662 mflowtype, mflowid, 2663 vrf_id, port); 2664 } else { 2665 /* this is abnormal... cookie-echo on existing TCB */ 2666 had_a_existing_tcb = 1; 2667 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2668 src, dst, sh, 2669 cookie, cookie_len, *inp_p, *stcb, netp, to, 2670 ¬ification, auth_skipped, auth_offset, auth_len, 2671 mflowtype, mflowid, 2672 vrf_id, port); 2673 } 2674 2675 if (*stcb == NULL) { 2676 /* still no TCB... must be bad cookie-echo */ 2677 return (NULL); 2678 } 2679 if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 2680 (*netp)->flowtype = mflowtype; 2681 } 2682 /* 2683 * Ok, we built an association so confirm the address we sent the 2684 * INIT-ACK to. 2685 */ 2686 netl = sctp_findnet(*stcb, to); 2687 /* 2688 * This code should in theory NOT run but 2689 */ 2690 if (netl == NULL) { 2691 /* TSNH! Huh, why do I need to add this address here? */ 2692 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2693 return (NULL); 2694 } 2695 netl = sctp_findnet(*stcb, to); 2696 } 2697 if (netl) { 2698 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2699 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2700 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2701 netl); 2702 send_int_conf = 1; 2703 } 2704 } 2705 sctp_start_net_timers(*stcb); 2706 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2707 if (!had_a_existing_tcb || 2708 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2709 /* 2710 * If we have a NEW cookie or the connect never 2711 * reached the connected state during collision we 2712 * must do the TCP accept thing. 2713 */ 2714 struct socket *so, *oso; 2715 struct sctp_inpcb *inp; 2716 2717 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2718 /* 2719 * For a restart we will keep the same 2720 * socket, no need to do anything. I THINK!! 2721 */ 2722 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2723 if (send_int_conf) { 2724 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2725 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2726 } 2727 return (m); 2728 } 2729 oso = (*inp_p)->sctp_socket; 2730 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2731 SCTP_TCB_UNLOCK((*stcb)); 2732 CURVNET_SET(oso->so_vnet); 2733 so = sonewconn(oso, 0 2734 ); 2735 CURVNET_RESTORE(); 2736 SCTP_TCB_LOCK((*stcb)); 2737 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2738 2739 if (so == NULL) { 2740 struct mbuf *op_err; 2741 2742#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2743 struct socket *pcb_so; 2744 2745#endif 2746 /* Too many sockets */ 2747 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2748 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2749 sctp_abort_association(*inp_p, NULL, m, iphlen, 2750 src, dst, sh, op_err, 2751 mflowtype, mflowid, 2752 vrf_id, port); 2753#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2754 pcb_so = SCTP_INP_SO(*inp_p); 2755 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2756 SCTP_TCB_UNLOCK((*stcb)); 2757 SCTP_SOCKET_LOCK(pcb_so, 1); 2758 SCTP_TCB_LOCK((*stcb)); 2759 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2760#endif 2761 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2762 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2763#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2764 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2765#endif 2766 return (NULL); 2767 } 2768 inp = (struct sctp_inpcb *)so->so_pcb; 2769 SCTP_INP_INCR_REF(inp); 2770 /* 2771 * We add the unbound flag here so that if we get an 2772 * soabort() before we get the move_pcb done, we 2773 * will properly cleanup. 2774 */ 2775 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2776 SCTP_PCB_FLAGS_CONNECTED | 2777 SCTP_PCB_FLAGS_IN_TCPPOOL | 2778 SCTP_PCB_FLAGS_UNBOUND | 2779 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2780 SCTP_PCB_FLAGS_DONT_WAKE); 2781 inp->sctp_features = (*inp_p)->sctp_features; 2782 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2783 inp->sctp_socket = so; 2784 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2785 inp->max_cwnd = (*inp_p)->max_cwnd; 2786 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2787 inp->ecn_supported = (*inp_p)->ecn_supported; 2788 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2789 inp->auth_supported = (*inp_p)->auth_supported; 2790 inp->asconf_supported = (*inp_p)->asconf_supported; 2791 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2792 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2793 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2794 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2795 inp->sctp_context = (*inp_p)->sctp_context; 2796 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2797 inp->fibnum = (*inp_p)->fibnum; 2798 inp->inp_starting_point_for_iterator = NULL; 2799 /* 2800 * copy in the authentication parameters from the 2801 * original endpoint 2802 */ 2803 if (inp->sctp_ep.local_hmacs) 2804 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2805 inp->sctp_ep.local_hmacs = 2806 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2807 if (inp->sctp_ep.local_auth_chunks) 2808 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2809 inp->sctp_ep.local_auth_chunks = 2810 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2811 2812 /* 2813 * Now we must move it from one hash table to 2814 * another and get the tcb in the right place. 2815 */ 2816 2817 /* 2818 * This is where the one-2-one socket is put into 2819 * the accept state waiting for the accept! 2820 */ 2821 if (*stcb) { 2822 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2823 } 2824 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2825 2826 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2827 SCTP_TCB_UNLOCK((*stcb)); 2828 2829 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2830 0); 2831 SCTP_TCB_LOCK((*stcb)); 2832 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2833 2834 2835 /* 2836 * now we must check to see if we were aborted while 2837 * the move was going on and the lock/unlock 2838 * happened. 2839 */ 2840 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2841 /* 2842 * yep it was, we leave the assoc attached 2843 * to the socket since the sctp_inpcb_free() 2844 * call will send an abort for us. 2845 */ 2846 SCTP_INP_DECR_REF(inp); 2847 return (NULL); 2848 } 2849 SCTP_INP_DECR_REF(inp); 2850 /* Switch over to the new guy */ 2851 *inp_p = inp; 2852 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2853 if (send_int_conf) { 2854 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2855 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2856 } 2857 /* 2858 * Pull it from the incomplete queue and wake the 2859 * guy 2860 */ 2861#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2862 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2863 SCTP_TCB_UNLOCK((*stcb)); 2864 SCTP_SOCKET_LOCK(so, 1); 2865#endif 2866 soisconnected(so); 2867#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2868 SCTP_TCB_LOCK((*stcb)); 2869 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2870 SCTP_SOCKET_UNLOCK(so, 1); 2871#endif 2872 return (m); 2873 } 2874 } 2875 if (notification) { 2876 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2877 } 2878 if (send_int_conf) { 2879 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2880 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2881 } 2882 return (m); 2883} 2884 2885static void 2886sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2887 struct sctp_tcb *stcb, struct sctp_nets *net) 2888{ 2889 /* cp must not be used, others call this without a c-ack :-) */ 2890 struct sctp_association *asoc; 2891 2892 SCTPDBG(SCTP_DEBUG_INPUT2, 2893 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2894 if ((stcb == NULL) || (net == NULL)) { 2895 return; 2896 } 2897 asoc = &stcb->asoc; 2898 2899 sctp_stop_all_cookie_timers(stcb); 2900 /* process according to association state */ 2901 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2902 /* state change only needed when I am in right state */ 2903 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2904 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2905 sctp_start_net_timers(stcb); 2906 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2907 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2908 stcb->sctp_ep, stcb, asoc->primary_destination); 2909 2910 } 2911 /* update RTO */ 2912 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2913 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2914 if (asoc->overall_error_count == 0) { 2915 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2916 &asoc->time_entered, sctp_align_safe_nocopy, 2917 SCTP_RTT_FROM_NON_DATA); 2918 } 2919 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2920 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2921 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2922 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2923#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2924 struct socket *so; 2925 2926#endif 2927 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2928#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2929 so = SCTP_INP_SO(stcb->sctp_ep); 2930 atomic_add_int(&stcb->asoc.refcnt, 1); 2931 SCTP_TCB_UNLOCK(stcb); 2932 SCTP_SOCKET_LOCK(so, 1); 2933 SCTP_TCB_LOCK(stcb); 2934 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2935#endif 2936 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2937 soisconnected(stcb->sctp_socket); 2938 } 2939#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2940 SCTP_SOCKET_UNLOCK(so, 1); 2941#endif 2942 } 2943 /* 2944 * since we did not send a HB make sure we don't double 2945 * things 2946 */ 2947 net->hb_responded = 1; 2948 2949 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2950 /* 2951 * We don't need to do the asconf thing, nor hb or 2952 * autoclose if the socket is closed. 2953 */ 2954 goto closed_socket; 2955 } 2956 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2957 stcb, net); 2958 2959 2960 if (stcb->asoc.sctp_autoclose_ticks && 2961 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2962 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2963 stcb->sctp_ep, stcb, NULL); 2964 } 2965 /* 2966 * send ASCONF if parameters are pending and ASCONFs are 2967 * allowed (eg. addresses changed when init/cookie echo were 2968 * in flight) 2969 */ 2970 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2971 (stcb->asoc.asconf_supported == 1) && 2972 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2973#ifdef SCTP_TIMER_BASED_ASCONF 2974 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2975 stcb->sctp_ep, stcb, 2976 stcb->asoc.primary_destination); 2977#else 2978 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2979 SCTP_ADDR_NOT_LOCKED); 2980#endif 2981 } 2982 } 2983closed_socket: 2984 /* Toss the cookie if I can */ 2985 sctp_toss_old_cookies(stcb, asoc); 2986 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2987 /* Restart the timer if we have pending data */ 2988 struct sctp_tmit_chunk *chk; 2989 2990 chk = TAILQ_FIRST(&asoc->sent_queue); 2991 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2992 } 2993} 2994 2995static void 2996sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2997 struct sctp_tcb *stcb) 2998{ 2999 struct sctp_nets *net; 3000 struct sctp_tmit_chunk *lchk; 3001 struct sctp_ecne_chunk bkup; 3002 uint8_t override_bit; 3003 uint32_t tsn, window_data_tsn; 3004 int len; 3005 unsigned int pkt_cnt; 3006 3007 len = ntohs(cp->ch.chunk_length); 3008 if ((len != sizeof(struct sctp_ecne_chunk)) && 3009 (len != sizeof(struct old_sctp_ecne_chunk))) { 3010 return; 3011 } 3012 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3013 /* Its the old format */ 3014 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3015 bkup.num_pkts_since_cwr = htonl(1); 3016 cp = &bkup; 3017 } 3018 SCTP_STAT_INCR(sctps_recvecne); 3019 tsn = ntohl(cp->tsn); 3020 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3021 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3022 if (lchk == NULL) { 3023 window_data_tsn = stcb->asoc.sending_seq - 1; 3024 } else { 3025 window_data_tsn = lchk->rec.data.TSN_seq; 3026 } 3027 3028 /* Find where it was sent to if possible. */ 3029 net = NULL; 3030 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3031 if (lchk->rec.data.TSN_seq == tsn) { 3032 net = lchk->whoTo; 3033 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3034 break; 3035 } 3036 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3037 break; 3038 } 3039 } 3040 if (net == NULL) { 3041 /* 3042 * What to do. A previous send of a CWR was possibly lost. 3043 * See how old it is, we may have it marked on the actual 3044 * net. 3045 */ 3046 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3047 if (tsn == net->last_cwr_tsn) { 3048 /* Found him, send it off */ 3049 break; 3050 } 3051 } 3052 if (net == NULL) { 3053 /* 3054 * If we reach here, we need to send a special CWR 3055 * that says hey, we did this a long time ago and 3056 * you lost the response. 3057 */ 3058 net = TAILQ_FIRST(&stcb->asoc.nets); 3059 if (net == NULL) { 3060 /* TSNH */ 3061 return; 3062 } 3063 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3064 } else { 3065 override_bit = 0; 3066 } 3067 } else { 3068 override_bit = 0; 3069 } 3070 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3071 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3072 /* 3073 * JRS - Use the congestion control given in the pluggable 3074 * CC module 3075 */ 3076 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3077 /* 3078 * We reduce once every RTT. So we will only lower cwnd at 3079 * the next sending seq i.e. the window_data_tsn 3080 */ 3081 net->cwr_window_tsn = window_data_tsn; 3082 net->ecn_ce_pkt_cnt += pkt_cnt; 3083 net->lost_cnt = pkt_cnt; 3084 net->last_cwr_tsn = tsn; 3085 } else { 3086 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3087 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3088 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3089 /* 3090 * Another loss in the same window update how many 3091 * marks/packets lost we have had. 3092 */ 3093 int cnt = 1; 3094 3095 if (pkt_cnt > net->lost_cnt) { 3096 /* Should be the case */ 3097 cnt = (pkt_cnt - net->lost_cnt); 3098 net->ecn_ce_pkt_cnt += cnt; 3099 } 3100 net->lost_cnt = pkt_cnt; 3101 net->last_cwr_tsn = tsn; 3102 /* 3103 * Most CC functions will ignore this call, since we 3104 * are in-window yet of the initial CE the peer saw. 3105 */ 3106 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3107 } 3108 } 3109 /* 3110 * We always send a CWR this way if our previous one was lost our 3111 * peer will get an update, or if it is not time again to reduce we 3112 * still get the cwr to the peer. Note we set the override when we 3113 * could not find the TSN on the chunk or the destination network. 3114 */ 3115 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3116} 3117 3118static void 3119sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3120{ 3121 /* 3122 * Here we get a CWR from the peer. We must look in the outqueue and 3123 * make sure that we have a covered ECNE in the control chunk part. 3124 * If so remove it. 3125 */ 3126 struct sctp_tmit_chunk *chk; 3127 struct sctp_ecne_chunk *ecne; 3128 int override; 3129 uint32_t cwr_tsn; 3130 3131 cwr_tsn = ntohl(cp->tsn); 3132 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3133 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3134 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3135 continue; 3136 } 3137 if ((override == 0) && (chk->whoTo != net)) { 3138 /* Must be from the right src unless override is set */ 3139 continue; 3140 } 3141 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3142 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3143 /* this covers this ECNE, we can remove it */ 3144 stcb->asoc.ecn_echo_cnt_onq--; 3145 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3146 sctp_next); 3147 sctp_m_freem(chk->data); 3148 chk->data = NULL; 3149 stcb->asoc.ctrl_queue_cnt--; 3150 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3151 if (override == 0) { 3152 break; 3153 } 3154 } 3155 } 3156} 3157 3158static void 3159sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3160 struct sctp_tcb *stcb, struct sctp_nets *net) 3161{ 3162 struct sctp_association *asoc; 3163 3164#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3165 struct socket *so; 3166 3167#endif 3168 3169 SCTPDBG(SCTP_DEBUG_INPUT2, 3170 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3171 if (stcb == NULL) 3172 return; 3173 3174 asoc = &stcb->asoc; 3175 /* process according to association state */ 3176 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3177 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3178 SCTPDBG(SCTP_DEBUG_INPUT2, 3179 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3180 SCTP_TCB_UNLOCK(stcb); 3181 return; 3182 } 3183 /* notify upper layer protocol */ 3184 if (stcb->sctp_socket) { 3185 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3186 } 3187#ifdef INVARIANTS 3188 if (!TAILQ_EMPTY(&asoc->send_queue) || 3189 !TAILQ_EMPTY(&asoc->sent_queue) || 3190 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3191 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3192 } 3193#endif 3194 /* stop the timer */ 3195 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3196 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3197 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3198 /* free the TCB */ 3199 SCTPDBG(SCTP_DEBUG_INPUT2, 3200 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3201#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3202 so = SCTP_INP_SO(stcb->sctp_ep); 3203 atomic_add_int(&stcb->asoc.refcnt, 1); 3204 SCTP_TCB_UNLOCK(stcb); 3205 SCTP_SOCKET_LOCK(so, 1); 3206 SCTP_TCB_LOCK(stcb); 3207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3208#endif 3209 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3210 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3211#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3212 SCTP_SOCKET_UNLOCK(so, 1); 3213#endif 3214 return; 3215} 3216 3217static int 3218process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3219 struct sctp_nets *net, uint8_t flg) 3220{ 3221 switch (desc->chunk_type) { 3222 case SCTP_DATA: 3223 /* find the tsn to resend (possibly */ 3224 { 3225 uint32_t tsn; 3226 struct sctp_tmit_chunk *tp1; 3227 3228 tsn = ntohl(desc->tsn_ifany); 3229 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3230 if (tp1->rec.data.TSN_seq == tsn) { 3231 /* found it */ 3232 break; 3233 } 3234 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3235 /* not found */ 3236 tp1 = NULL; 3237 break; 3238 } 3239 } 3240 if (tp1 == NULL) { 3241 /* 3242 * Do it the other way , aka without paying 3243 * attention to queue seq order. 3244 */ 3245 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3246 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3247 if (tp1->rec.data.TSN_seq == tsn) { 3248 /* found it */ 3249 break; 3250 } 3251 } 3252 } 3253 if (tp1 == NULL) { 3254 SCTP_STAT_INCR(sctps_pdrptsnnf); 3255 } 3256 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3257 uint8_t *ddp; 3258 3259 if (((flg & SCTP_BADCRC) == 0) && 3260 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3261 return (0); 3262 } 3263 if ((stcb->asoc.peers_rwnd == 0) && 3264 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3265 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3266 return (0); 3267 } 3268 if (stcb->asoc.peers_rwnd == 0 && 3269 (flg & SCTP_FROM_MIDDLE_BOX)) { 3270 SCTP_STAT_INCR(sctps_pdrpdizrw); 3271 return (0); 3272 } 3273 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3274 sizeof(struct sctp_data_chunk)); 3275 { 3276 unsigned int iii; 3277 3278 for (iii = 0; iii < sizeof(desc->data_bytes); 3279 iii++) { 3280 if (ddp[iii] != desc->data_bytes[iii]) { 3281 SCTP_STAT_INCR(sctps_pdrpbadd); 3282 return (-1); 3283 } 3284 } 3285 } 3286 3287 if (tp1->do_rtt) { 3288 /* 3289 * this guy had a RTO calculation 3290 * pending on it, cancel it 3291 */ 3292 if (tp1->whoTo->rto_needed == 0) { 3293 tp1->whoTo->rto_needed = 1; 3294 } 3295 tp1->do_rtt = 0; 3296 } 3297 SCTP_STAT_INCR(sctps_pdrpmark); 3298 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3299 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3300 /* 3301 * mark it as if we were doing a FR, since 3302 * we will be getting gap ack reports behind 3303 * the info from the router. 3304 */ 3305 tp1->rec.data.doing_fast_retransmit = 1; 3306 /* 3307 * mark the tsn with what sequences can 3308 * cause a new FR. 3309 */ 3310 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3311 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3312 } else { 3313 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3314 } 3315 3316 /* restart the timer */ 3317 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3318 stcb, tp1->whoTo, 3319 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3320 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3321 stcb, tp1->whoTo); 3322 3323 /* fix counts and things */ 3324 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3325 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3326 tp1->whoTo->flight_size, 3327 tp1->book_size, 3328 (uintptr_t) stcb, 3329 tp1->rec.data.TSN_seq); 3330 } 3331 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3332 sctp_flight_size_decrease(tp1); 3333 sctp_total_flight_decrease(stcb, tp1); 3334 } 3335 tp1->sent = SCTP_DATAGRAM_RESEND; 3336 } { 3337 /* audit code */ 3338 unsigned int audit; 3339 3340 audit = 0; 3341 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3342 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3343 audit++; 3344 } 3345 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3346 sctp_next) { 3347 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3348 audit++; 3349 } 3350 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3351 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3352 audit, stcb->asoc.sent_queue_retran_cnt); 3353#ifndef SCTP_AUDITING_ENABLED 3354 stcb->asoc.sent_queue_retran_cnt = audit; 3355#endif 3356 } 3357 } 3358 } 3359 break; 3360 case SCTP_ASCONF: 3361 { 3362 struct sctp_tmit_chunk *asconf; 3363 3364 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3365 sctp_next) { 3366 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3367 break; 3368 } 3369 } 3370 if (asconf) { 3371 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3372 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3373 asconf->sent = SCTP_DATAGRAM_RESEND; 3374 asconf->snd_count--; 3375 } 3376 } 3377 break; 3378 case SCTP_INITIATION: 3379 /* resend the INIT */ 3380 stcb->asoc.dropped_special_cnt++; 3381 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3382 /* 3383 * If we can get it in, in a few attempts we do 3384 * this, otherwise we let the timer fire. 3385 */ 3386 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3387 stcb, net, 3388 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 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, uint32_t number_entries, uint16_t * list) 3487{ 3488 uint32_t i; 3489 uint16_t temp; 3490 3491 if (number_entries > 0) { 3492 for (i = 0; i < number_entries; i++) { 3493 temp = ntohs(list[i]); 3494 if (temp >= stcb->asoc.streamoutcnt) { 3495 /* no such stream */ 3496 continue; 3497 } 3498 stcb->asoc.strmout[temp].next_sequence_send = 0; 3499 } 3500 } else { 3501 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3502 stcb->asoc.strmout[i].next_sequence_send = 0; 3503 } 3504 } 3505 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3506} 3507 3508 3509struct sctp_stream_reset_request * 3510sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3511{ 3512 struct sctp_association *asoc; 3513 struct sctp_chunkhdr *ch; 3514 struct sctp_stream_reset_request *r; 3515 struct sctp_tmit_chunk *chk; 3516 int len, clen; 3517 3518 asoc = &stcb->asoc; 3519 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3520 asoc->stream_reset_outstanding = 0; 3521 return (NULL); 3522 } 3523 if (stcb->asoc.str_reset == NULL) { 3524 asoc->stream_reset_outstanding = 0; 3525 return (NULL); 3526 } 3527 chk = stcb->asoc.str_reset; 3528 if (chk->data == NULL) { 3529 return (NULL); 3530 } 3531 if (bchk) { 3532 /* he wants a copy of the chk pointer */ 3533 *bchk = chk; 3534 } 3535 clen = chk->send_size; 3536 ch = mtod(chk->data, struct sctp_chunkhdr *); 3537 r = (struct sctp_stream_reset_request *)(ch + 1); 3538 if (ntohl(r->request_seq) == seq) { 3539 /* found it */ 3540 return (r); 3541 } 3542 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3543 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3544 /* move to the next one, there can only be a max of two */ 3545 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3546 if (ntohl(r->request_seq) == seq) { 3547 return (r); 3548 } 3549 } 3550 /* that seq is not here */ 3551 return (NULL); 3552} 3553 3554static void 3555sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3556{ 3557 struct sctp_association *asoc; 3558 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3559 3560 if (stcb->asoc.str_reset == NULL) { 3561 return; 3562 } 3563 asoc = &stcb->asoc; 3564 3565 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3566 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 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_request *req_param; 3591 struct sctp_stream_reset_out_request *req_out_param; 3592 struct sctp_stream_reset_in_request *req_in_param; 3593 uint32_t number_entries; 3594 3595 if (asoc->stream_reset_outstanding == 0) { 3596 /* duplicate */ 3597 return (0); 3598 } 3599 if (seq == stcb->asoc.str_reset_seq_out) { 3600 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3601 if (req_param != NULL) { 3602 stcb->asoc.str_reset_seq_out++; 3603 type = ntohs(req_param->ph.param_type); 3604 lparm_len = ntohs(req_param->ph.param_length); 3605 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3606 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3607 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3608 asoc->stream_reset_out_is_outstanding = 0; 3609 if (asoc->stream_reset_outstanding) 3610 asoc->stream_reset_outstanding--; 3611 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3612 /* do it */ 3613 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3614 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3615 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3616 } else { 3617 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3618 } 3619 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3620 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3621 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3622 if (asoc->stream_reset_outstanding) 3623 asoc->stream_reset_outstanding--; 3624 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3625 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3626 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3627 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3628 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3629 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3630 } 3631 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3632 /* Ok we now may have more streams */ 3633 int num_stream; 3634 3635 num_stream = stcb->asoc.strm_pending_add_size; 3636 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3637 /* TSNH */ 3638 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3639 } 3640 stcb->asoc.strm_pending_add_size = 0; 3641 if (asoc->stream_reset_outstanding) 3642 asoc->stream_reset_outstanding--; 3643 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3644 /* Put the new streams into effect */ 3645 stcb->asoc.streamoutcnt += num_stream; 3646 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3647 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3648 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3649 SCTP_STREAM_CHANGE_DENIED); 3650 } else { 3651 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3652 SCTP_STREAM_CHANGE_FAILED); 3653 } 3654 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3655 if (asoc->stream_reset_outstanding) 3656 asoc->stream_reset_outstanding--; 3657 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3658 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3659 SCTP_STREAM_CHANGE_DENIED); 3660 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3661 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3662 SCTP_STREAM_CHANGE_FAILED); 3663 } 3664 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3665 /** 3666 * a) Adopt the new in tsn. 3667 * b) reset the map 3668 * c) Adopt the new out-tsn 3669 */ 3670 struct sctp_stream_reset_response_tsn *resp; 3671 struct sctp_forward_tsn_chunk fwdtsn; 3672 int abort_flag = 0; 3673 3674 if (respin == NULL) { 3675 /* huh ? */ 3676 return (0); 3677 } 3678 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3679 return (0); 3680 } 3681 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3682 resp = (struct sctp_stream_reset_response_tsn *)respin; 3683 asoc->stream_reset_outstanding--; 3684 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3685 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3686 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3687 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3688 if (abort_flag) { 3689 return (1); 3690 } 3691 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3692 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3693 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3694 } 3695 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3696 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3697 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3698 3699 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3700 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3701 3702 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3703 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3704 3705 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3706 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3707 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3708 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3709 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3710 SCTP_ASSOC_RESET_DENIED); 3711 } else { 3712 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3713 SCTP_ASSOC_RESET_FAILED); 3714 } 3715 } 3716 /* get rid of the request and get the request flags */ 3717 if (asoc->stream_reset_outstanding == 0) { 3718 sctp_clean_up_stream_reset(stcb); 3719 } 3720 } 3721 } 3722 return (0); 3723} 3724 3725static void 3726sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3727 struct sctp_tmit_chunk *chk, 3728 struct sctp_stream_reset_in_request *req, int trunc) 3729{ 3730 uint32_t seq; 3731 int len, i; 3732 int number_entries; 3733 uint16_t temp; 3734 3735 /* 3736 * peer wants me to send a str-reset to him for my outgoing seq's if 3737 * seq_in is right. 3738 */ 3739 struct sctp_association *asoc = &stcb->asoc; 3740 3741 seq = ntohl(req->request_seq); 3742 if (asoc->str_reset_seq_in == seq) { 3743 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3744 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3745 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3746 } else if (trunc) { 3747 /* Can't do it, since they exceeded our buffer size */ 3748 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3749 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3750 len = ntohs(req->ph.param_length); 3751 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3752 for (i = 0; i < number_entries; i++) { 3753 temp = ntohs(req->list_of_streams[i]); 3754 req->list_of_streams[i] = temp; 3755 } 3756 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3757 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3758 asoc->str_reset_seq_out, 3759 seq, (asoc->sending_seq - 1)); 3760 asoc->stream_reset_out_is_outstanding = 1; 3761 asoc->str_reset = chk; 3762 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3763 stcb->asoc.stream_reset_outstanding++; 3764 } else { 3765 /* Can't do it, since we have sent one out */ 3766 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3767 } 3768 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3769 asoc->str_reset_seq_in++; 3770 } else if (asoc->str_reset_seq_in - 1 == seq) { 3771 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3772 } else if (asoc->str_reset_seq_in - 2 == seq) { 3773 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3774 } else { 3775 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3776 } 3777} 3778 3779static int 3780sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3781 struct sctp_tmit_chunk *chk, 3782 struct sctp_stream_reset_tsn_request *req) 3783{ 3784 /* reset all in and out and update the tsn */ 3785 /* 3786 * A) reset my str-seq's on in and out. B) Select a receive next, 3787 * and set cum-ack to it. Also process this selected number as a 3788 * fwd-tsn as well. C) set in the response my next sending seq. 3789 */ 3790 struct sctp_forward_tsn_chunk fwdtsn; 3791 struct sctp_association *asoc = &stcb->asoc; 3792 int abort_flag = 0; 3793 uint32_t seq; 3794 3795 seq = ntohl(req->request_seq); 3796 if (asoc->str_reset_seq_in == seq) { 3797 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3798 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3799 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3800 } else { 3801 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3802 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3803 fwdtsn.ch.chunk_flags = 0; 3804 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3805 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3806 if (abort_flag) { 3807 return (1); 3808 } 3809 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3810 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3811 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3812 } 3813 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3814 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3815 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3816 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3817 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3818 atomic_add_int(&asoc->sending_seq, 1); 3819 /* save off historical data for retrans */ 3820 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3821 asoc->last_sending_seq[0] = asoc->sending_seq; 3822 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3823 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3824 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3825 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3826 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3827 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3828 } 3829 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3830 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3831 asoc->str_reset_seq_in++; 3832 } else if (asoc->str_reset_seq_in - 1 == seq) { 3833 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3834 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3835 } else if (asoc->str_reset_seq_in - 2 == seq) { 3836 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3837 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3838 } else { 3839 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3840 } 3841 return (0); 3842} 3843 3844static void 3845sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3846 struct sctp_tmit_chunk *chk, 3847 struct sctp_stream_reset_out_request *req, int trunc) 3848{ 3849 uint32_t seq, tsn; 3850 int number_entries, len; 3851 struct sctp_association *asoc = &stcb->asoc; 3852 3853 seq = ntohl(req->request_seq); 3854 3855 /* now if its not a duplicate we process it */ 3856 if (asoc->str_reset_seq_in == seq) { 3857 len = ntohs(req->ph.param_length); 3858 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3859 /* 3860 * the sender is resetting, handle the list issue.. we must 3861 * a) verify if we can do the reset, if so no problem b) If 3862 * we can't do the reset we must copy the request. c) queue 3863 * it, and setup the data in processor to trigger it off 3864 * when needed and dequeue all the queued data. 3865 */ 3866 tsn = ntohl(req->send_reset_at_tsn); 3867 3868 /* move the reset action back one */ 3869 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3870 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3871 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3872 } else if (trunc) { 3873 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3874 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3875 /* we can do it now */ 3876 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3877 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3878 } else { 3879 /* 3880 * we must queue it up and thus wait for the TSN's 3881 * to arrive that are at or before tsn 3882 */ 3883 struct sctp_stream_reset_list *liste; 3884 int siz; 3885 3886 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3887 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3888 siz, SCTP_M_STRESET); 3889 if (liste == NULL) { 3890 /* gak out of memory */ 3891 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 return; 3894 } 3895 liste->tsn = tsn; 3896 liste->number_entries = number_entries; 3897 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3898 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3899 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3900 } 3901 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3902 asoc->str_reset_seq_in++; 3903 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3904 /* 3905 * one 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[0]); 3909 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3910 /* 3911 * two seq back, just echo back last action since my 3912 * response was lost. 3913 */ 3914 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3915 } else { 3916 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3917 } 3918} 3919 3920static void 3921sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3922 struct sctp_stream_reset_add_strm *str_add) 3923{ 3924 /* 3925 * Peer is requesting to add more streams. If its within our 3926 * max-streams we will allow it. 3927 */ 3928 uint32_t num_stream, i; 3929 uint32_t seq; 3930 struct sctp_association *asoc = &stcb->asoc; 3931 struct sctp_queued_to_read *ctl, *nctl; 3932 3933 /* Get the number. */ 3934 seq = ntohl(str_add->request_seq); 3935 num_stream = ntohs(str_add->number_of_streams); 3936 /* Now what would be the new total? */ 3937 if (asoc->str_reset_seq_in == seq) { 3938 num_stream += stcb->asoc.streamincnt; 3939 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3940 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3941 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3942 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3943 (num_stream > 0xffff)) { 3944 /* We must reject it they ask for to many */ 3945 denied: 3946 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3947 } else { 3948 /* Ok, we can do that :-) */ 3949 struct sctp_stream_in *oldstrm; 3950 3951 /* save off the old */ 3952 oldstrm = stcb->asoc.strmin; 3953 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3954 (num_stream * sizeof(struct sctp_stream_in)), 3955 SCTP_M_STRMI); 3956 if (stcb->asoc.strmin == NULL) { 3957 stcb->asoc.strmin = oldstrm; 3958 goto denied; 3959 } 3960 /* copy off the old data */ 3961 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3962 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3963 stcb->asoc.strmin[i].stream_no = i; 3964 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3965 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3966 /* now anything on those queues? */ 3967 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3968 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3969 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3970 } 3971 } 3972 /* Init the new streams */ 3973 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3974 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3975 stcb->asoc.strmin[i].stream_no = i; 3976 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3977 stcb->asoc.strmin[i].delivery_started = 0; 3978 } 3979 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3980 /* update the size */ 3981 stcb->asoc.streamincnt = num_stream; 3982 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3983 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3984 } 3985 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3986 asoc->str_reset_seq_in++; 3987 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3988 /* 3989 * one 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[0]); 3993 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3994 /* 3995 * two seq back, just echo back last action since my 3996 * response was lost. 3997 */ 3998 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3999 } else { 4000 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4001 4002 } 4003} 4004 4005static void 4006sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4007 struct sctp_stream_reset_add_strm *str_add) 4008{ 4009 /* 4010 * Peer is requesting to add more streams. If its within our 4011 * max-streams we will allow it. 4012 */ 4013 uint16_t num_stream; 4014 uint32_t seq; 4015 struct sctp_association *asoc = &stcb->asoc; 4016 4017 /* Get the number. */ 4018 seq = ntohl(str_add->request_seq); 4019 num_stream = ntohs(str_add->number_of_streams); 4020 /* Now what would be the new total? */ 4021 if (asoc->str_reset_seq_in == seq) { 4022 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4023 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4024 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4025 } else if (stcb->asoc.stream_reset_outstanding) { 4026 /* We must reject it we have something pending */ 4027 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4028 } else { 4029 /* Ok, we can do that :-) */ 4030 int mychk; 4031 4032 mychk = stcb->asoc.streamoutcnt; 4033 mychk += num_stream; 4034 if (mychk < 0x10000) { 4035 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4036 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4037 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4038 } 4039 } else { 4040 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4041 } 4042 } 4043 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4044 asoc->str_reset_seq_in++; 4045 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4046 /* 4047 * one 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[0]); 4051 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4052 /* 4053 * two seq back, just echo back last action since my 4054 * response was lost. 4055 */ 4056 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4057 } else { 4058 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4059 } 4060} 4061 4062#ifdef __GNUC__ 4063__attribute__((noinline)) 4064#endif 4065 static int 4066 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4067 struct sctp_chunkhdr *ch_req) 4068{ 4069 uint16_t remaining_length, param_len, ptype; 4070 struct sctp_paramhdr pstore; 4071 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4072 uint32_t seq = 0; 4073 int num_req = 0; 4074 int trunc = 0; 4075 struct sctp_tmit_chunk *chk; 4076 struct sctp_chunkhdr *ch; 4077 struct sctp_paramhdr *ph; 4078 int ret_code = 0; 4079 int num_param = 0; 4080 4081 /* now it may be a reset or a reset-response */ 4082 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4083 4084 /* setup for adding the response */ 4085 sctp_alloc_a_chunk(stcb, chk); 4086 if (chk == NULL) { 4087 return (ret_code); 4088 } 4089 chk->copy_by_ref = 0; 4090 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4091 chk->rec.chunk_id.can_take_data = 0; 4092 chk->flags = 0; 4093 chk->asoc = &stcb->asoc; 4094 chk->no_fr_allowed = 0; 4095 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4096 chk->book_size_scale = 0; 4097 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4098 if (chk->data == NULL) { 4099strres_nochunk: 4100 if (chk->data) { 4101 sctp_m_freem(chk->data); 4102 chk->data = NULL; 4103 } 4104 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4105 return (ret_code); 4106 } 4107 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4108 4109 /* setup chunk parameters */ 4110 chk->sent = SCTP_DATAGRAM_UNSENT; 4111 chk->snd_count = 0; 4112 chk->whoTo = NULL; 4113 4114 ch = mtod(chk->data, struct sctp_chunkhdr *); 4115 ch->chunk_type = SCTP_STREAM_RESET; 4116 ch->chunk_flags = 0; 4117 ch->chunk_length = htons(chk->send_size); 4118 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4119 offset += sizeof(struct sctp_chunkhdr); 4120 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4121 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4122 if (ph == NULL) { 4123 /* TSNH */ 4124 break; 4125 } 4126 param_len = ntohs(ph->param_length); 4127 if ((param_len > remaining_length) || 4128 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4129 /* bad parameter length */ 4130 break; 4131 } 4132 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4133 (uint8_t *) & cstore); 4134 if (ph == NULL) { 4135 /* TSNH */ 4136 break; 4137 } 4138 ptype = ntohs(ph->param_type); 4139 num_param++; 4140 if (param_len > sizeof(cstore)) { 4141 trunc = 1; 4142 } else { 4143 trunc = 0; 4144 } 4145 if (num_param > SCTP_MAX_RESET_PARAMS) { 4146 /* hit the max of parameters already sorry.. */ 4147 break; 4148 } 4149 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4150 struct sctp_stream_reset_out_request *req_out; 4151 4152 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4153 break; 4154 } 4155 req_out = (struct sctp_stream_reset_out_request *)ph; 4156 num_req++; 4157 if (stcb->asoc.stream_reset_outstanding) { 4158 seq = ntohl(req_out->response_seq); 4159 if (seq == stcb->asoc.str_reset_seq_out) { 4160 /* implicit ack */ 4161 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4162 } 4163 } 4164 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4165 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4166 struct sctp_stream_reset_add_strm *str_add; 4167 4168 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4169 break; 4170 } 4171 str_add = (struct sctp_stream_reset_add_strm *)ph; 4172 num_req++; 4173 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4174 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4175 struct sctp_stream_reset_add_strm *str_add; 4176 4177 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4178 break; 4179 } 4180 str_add = (struct sctp_stream_reset_add_strm *)ph; 4181 num_req++; 4182 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4183 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4184 struct sctp_stream_reset_in_request *req_in; 4185 4186 num_req++; 4187 req_in = (struct sctp_stream_reset_in_request *)ph; 4188 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4189 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4190 struct sctp_stream_reset_tsn_request *req_tsn; 4191 4192 num_req++; 4193 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4194 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4195 ret_code = 1; 4196 goto strres_nochunk; 4197 } 4198 /* no more */ 4199 break; 4200 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4201 struct sctp_stream_reset_response *resp; 4202 uint32_t result; 4203 4204 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4205 break; 4206 } 4207 resp = (struct sctp_stream_reset_response *)ph; 4208 seq = ntohl(resp->response_seq); 4209 result = ntohl(resp->result); 4210 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4211 ret_code = 1; 4212 goto strres_nochunk; 4213 } 4214 } else { 4215 break; 4216 } 4217 offset += SCTP_SIZE32(param_len); 4218 if (remaining_length >= SCTP_SIZE32(param_len)) { 4219 remaining_length -= SCTP_SIZE32(param_len); 4220 } else { 4221 remaining_length = 0; 4222 } 4223 } 4224 if (num_req == 0) { 4225 /* we have no response free the stuff */ 4226 goto strres_nochunk; 4227 } 4228 /* ok we have a chunk to link in */ 4229 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4230 chk, 4231 sctp_next); 4232 stcb->asoc.ctrl_queue_cnt++; 4233 return (ret_code); 4234} 4235 4236/* 4237 * Handle a router or endpoints report of a packet loss, there are two ways 4238 * to handle this, either we get the whole packet and must disect it 4239 * ourselves (possibly with truncation and or corruption) or it is a summary 4240 * from a middle box that did the disectting for us. 4241 */ 4242static void 4243sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4244 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4245{ 4246 uint32_t bottle_bw, on_queue; 4247 uint16_t trunc_len; 4248 unsigned int chlen; 4249 unsigned int at; 4250 struct sctp_chunk_desc desc; 4251 struct sctp_chunkhdr *ch; 4252 4253 chlen = ntohs(cp->ch.chunk_length); 4254 chlen -= sizeof(struct sctp_pktdrop_chunk); 4255 /* XXX possible chlen underflow */ 4256 if (chlen == 0) { 4257 ch = NULL; 4258 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4259 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4260 } else { 4261 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4262 chlen -= sizeof(struct sctphdr); 4263 /* XXX possible chlen underflow */ 4264 memset(&desc, 0, sizeof(desc)); 4265 } 4266 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4267 if (trunc_len > limit) { 4268 trunc_len = limit; 4269 } 4270 /* now the chunks themselves */ 4271 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4272 desc.chunk_type = ch->chunk_type; 4273 /* get amount we need to move */ 4274 at = ntohs(ch->chunk_length); 4275 if (at < sizeof(struct sctp_chunkhdr)) { 4276 /* corrupt chunk, maybe at the end? */ 4277 SCTP_STAT_INCR(sctps_pdrpcrupt); 4278 break; 4279 } 4280 if (trunc_len == 0) { 4281 /* we are supposed to have all of it */ 4282 if (at > chlen) { 4283 /* corrupt skip it */ 4284 SCTP_STAT_INCR(sctps_pdrpcrupt); 4285 break; 4286 } 4287 } else { 4288 /* is there enough of it left ? */ 4289 if (desc.chunk_type == SCTP_DATA) { 4290 if (chlen < (sizeof(struct sctp_data_chunk) + 4291 sizeof(desc.data_bytes))) { 4292 break; 4293 } 4294 } else { 4295 if (chlen < sizeof(struct sctp_chunkhdr)) { 4296 break; 4297 } 4298 } 4299 } 4300 if (desc.chunk_type == SCTP_DATA) { 4301 /* can we get out the tsn? */ 4302 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4303 SCTP_STAT_INCR(sctps_pdrpmbda); 4304 4305 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4306 /* yep */ 4307 struct sctp_data_chunk *dcp; 4308 uint8_t *ddp; 4309 unsigned int iii; 4310 4311 dcp = (struct sctp_data_chunk *)ch; 4312 ddp = (uint8_t *) (dcp + 1); 4313 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4314 desc.data_bytes[iii] = ddp[iii]; 4315 } 4316 desc.tsn_ifany = dcp->dp.tsn; 4317 } else { 4318 /* nope we are done. */ 4319 SCTP_STAT_INCR(sctps_pdrpnedat); 4320 break; 4321 } 4322 } else { 4323 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4324 SCTP_STAT_INCR(sctps_pdrpmbct); 4325 } 4326 4327 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4328 SCTP_STAT_INCR(sctps_pdrppdbrk); 4329 break; 4330 } 4331 if (SCTP_SIZE32(at) > chlen) { 4332 break; 4333 } 4334 chlen -= SCTP_SIZE32(at); 4335 if (chlen < sizeof(struct sctp_chunkhdr)) { 4336 /* done, none left */ 4337 break; 4338 } 4339 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4340 } 4341 /* Now update any rwnd --- possibly */ 4342 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4343 /* From a peer, we get a rwnd report */ 4344 uint32_t a_rwnd; 4345 4346 SCTP_STAT_INCR(sctps_pdrpfehos); 4347 4348 bottle_bw = ntohl(cp->bottle_bw); 4349 on_queue = ntohl(cp->current_onq); 4350 if (bottle_bw && on_queue) { 4351 /* a rwnd report is in here */ 4352 if (bottle_bw > on_queue) 4353 a_rwnd = bottle_bw - on_queue; 4354 else 4355 a_rwnd = 0; 4356 4357 if (a_rwnd == 0) 4358 stcb->asoc.peers_rwnd = 0; 4359 else { 4360 if (a_rwnd > stcb->asoc.total_flight) { 4361 stcb->asoc.peers_rwnd = 4362 a_rwnd - stcb->asoc.total_flight; 4363 } else { 4364 stcb->asoc.peers_rwnd = 0; 4365 } 4366 if (stcb->asoc.peers_rwnd < 4367 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4368 /* SWS sender side engages */ 4369 stcb->asoc.peers_rwnd = 0; 4370 } 4371 } 4372 } 4373 } else { 4374 SCTP_STAT_INCR(sctps_pdrpfmbox); 4375 } 4376 4377 /* now middle boxes in sat networks get a cwnd bump */ 4378 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4379 (stcb->asoc.sat_t3_loss_recovery == 0) && 4380 (stcb->asoc.sat_network)) { 4381 /* 4382 * This is debateable but for sat networks it makes sense 4383 * Note if a T3 timer has went off, we will prohibit any 4384 * changes to cwnd until we exit the t3 loss recovery. 4385 */ 4386 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4387 net, cp, &bottle_bw, &on_queue); 4388 } 4389} 4390 4391/* 4392 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4393 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4394 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4395 * length of the complete packet outputs: - length: modified to remaining 4396 * length after control processing - netp: modified to new sctp_nets after 4397 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4398 * bad packet,...) otherwise return the tcb for this packet 4399 */ 4400#ifdef __GNUC__ 4401__attribute__((noinline)) 4402#endif 4403 static struct sctp_tcb * 4404 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4405 struct sockaddr *src, struct sockaddr *dst, 4406 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4407 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4408 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4409 uint32_t vrf_id, uint16_t port) 4410{ 4411 struct sctp_association *asoc; 4412 struct mbuf *op_err; 4413 char msg[SCTP_DIAG_INFO_LEN]; 4414 uint32_t vtag_in; 4415 int num_chunks = 0; /* number of control chunks processed */ 4416 uint32_t chk_length; 4417 int ret; 4418 int abort_no_unlock = 0; 4419 int ecne_seen = 0; 4420 4421 /* 4422 * How big should this be, and should it be alloc'd? Lets try the 4423 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4424 * until we get into jumbo grams and such.. 4425 */ 4426 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4427 struct sctp_tcb *locked_tcb = stcb; 4428 int got_auth = 0; 4429 uint32_t auth_offset = 0, auth_len = 0; 4430 int auth_skipped = 0; 4431 int asconf_cnt = 0; 4432 4433#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4434 struct socket *so; 4435 4436#endif 4437 4438 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4439 iphlen, *offset, length, (void *)stcb); 4440 4441 /* validate chunk header length... */ 4442 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4443 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4444 ntohs(ch->chunk_length)); 4445 if (locked_tcb) { 4446 SCTP_TCB_UNLOCK(locked_tcb); 4447 } 4448 return (NULL); 4449 } 4450 /* 4451 * validate the verification tag 4452 */ 4453 vtag_in = ntohl(sh->v_tag); 4454 4455 if (locked_tcb) { 4456 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4457 } 4458 if (ch->chunk_type == SCTP_INITIATION) { 4459 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4460 ntohs(ch->chunk_length), vtag_in); 4461 if (vtag_in != 0) { 4462 /* protocol error- silently discard... */ 4463 SCTP_STAT_INCR(sctps_badvtag); 4464 if (locked_tcb) { 4465 SCTP_TCB_UNLOCK(locked_tcb); 4466 } 4467 return (NULL); 4468 } 4469 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4470 /* 4471 * If there is no stcb, skip the AUTH chunk and process 4472 * later after a stcb is found (to validate the lookup was 4473 * valid. 4474 */ 4475 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4476 (stcb == NULL) && 4477 (inp->auth_supported == 1)) { 4478 /* save this chunk for later processing */ 4479 auth_skipped = 1; 4480 auth_offset = *offset; 4481 auth_len = ntohs(ch->chunk_length); 4482 4483 /* (temporarily) move past this chunk */ 4484 *offset += SCTP_SIZE32(auth_len); 4485 if (*offset >= length) { 4486 /* no more data left in the mbuf chain */ 4487 *offset = length; 4488 if (locked_tcb) { 4489 SCTP_TCB_UNLOCK(locked_tcb); 4490 } 4491 return (NULL); 4492 } 4493 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4494 sizeof(struct sctp_chunkhdr), chunk_buf); 4495 } 4496 if (ch == NULL) { 4497 /* Help */ 4498 *offset = length; 4499 if (locked_tcb) { 4500 SCTP_TCB_UNLOCK(locked_tcb); 4501 } 4502 return (NULL); 4503 } 4504 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4505 goto process_control_chunks; 4506 } 4507 /* 4508 * first check if it's an ASCONF with an unknown src addr we 4509 * need to look inside to find the association 4510 */ 4511 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4512 struct sctp_chunkhdr *asconf_ch = ch; 4513 uint32_t asconf_offset = 0, asconf_len = 0; 4514 4515 /* inp's refcount may be reduced */ 4516 SCTP_INP_INCR_REF(inp); 4517 4518 asconf_offset = *offset; 4519 do { 4520 asconf_len = ntohs(asconf_ch->chunk_length); 4521 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4522 break; 4523 stcb = sctp_findassociation_ep_asconf(m, 4524 *offset, 4525 dst, 4526 sh, &inp, netp, vrf_id); 4527 if (stcb != NULL) 4528 break; 4529 asconf_offset += SCTP_SIZE32(asconf_len); 4530 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4531 sizeof(struct sctp_chunkhdr), chunk_buf); 4532 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4533 if (stcb == NULL) { 4534 /* 4535 * reduce inp's refcount if not reduced in 4536 * sctp_findassociation_ep_asconf(). 4537 */ 4538 SCTP_INP_DECR_REF(inp); 4539 } else { 4540 locked_tcb = stcb; 4541 } 4542 4543 /* now go back and verify any auth chunk to be sure */ 4544 if (auth_skipped && (stcb != NULL)) { 4545 struct sctp_auth_chunk *auth; 4546 4547 auth = (struct sctp_auth_chunk *) 4548 sctp_m_getptr(m, auth_offset, 4549 auth_len, chunk_buf); 4550 got_auth = 1; 4551 auth_skipped = 0; 4552 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4553 auth_offset)) { 4554 /* auth HMAC failed so dump it */ 4555 *offset = length; 4556 if (locked_tcb) { 4557 SCTP_TCB_UNLOCK(locked_tcb); 4558 } 4559 return (NULL); 4560 } else { 4561 /* remaining chunks are HMAC checked */ 4562 stcb->asoc.authenticated = 1; 4563 } 4564 } 4565 } 4566 if (stcb == NULL) { 4567 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4568 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4569 msg); 4570 /* no association, so it's out of the blue... */ 4571 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4572 mflowtype, mflowid, inp->fibnum, 4573 vrf_id, port); 4574 *offset = length; 4575 if (locked_tcb) { 4576 SCTP_TCB_UNLOCK(locked_tcb); 4577 } 4578 return (NULL); 4579 } 4580 asoc = &stcb->asoc; 4581 /* ABORT and SHUTDOWN can use either v_tag... */ 4582 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4583 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4584 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4585 /* Take the T-bit always into account. */ 4586 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4587 (vtag_in == asoc->my_vtag)) || 4588 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4589 (vtag_in == asoc->peer_vtag))) { 4590 /* this is valid */ 4591 } else { 4592 /* drop this packet... */ 4593 SCTP_STAT_INCR(sctps_badvtag); 4594 if (locked_tcb) { 4595 SCTP_TCB_UNLOCK(locked_tcb); 4596 } 4597 return (NULL); 4598 } 4599 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4600 if (vtag_in != asoc->my_vtag) { 4601 /* 4602 * this could be a stale SHUTDOWN-ACK or the 4603 * peer never got the SHUTDOWN-COMPLETE and 4604 * is still hung; we have started a new asoc 4605 * but it won't complete until the shutdown 4606 * is completed 4607 */ 4608 if (locked_tcb) { 4609 SCTP_TCB_UNLOCK(locked_tcb); 4610 } 4611 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4612 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4613 msg); 4614 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4615 sh, inp, op_err, 4616 mflowtype, mflowid, fibnum, 4617 vrf_id, port); 4618 return (NULL); 4619 } 4620 } else { 4621 /* for all other chunks, vtag must match */ 4622 if (vtag_in != asoc->my_vtag) { 4623 /* invalid vtag... */ 4624 SCTPDBG(SCTP_DEBUG_INPUT3, 4625 "invalid vtag: %xh, expect %xh\n", 4626 vtag_in, asoc->my_vtag); 4627 SCTP_STAT_INCR(sctps_badvtag); 4628 if (locked_tcb) { 4629 SCTP_TCB_UNLOCK(locked_tcb); 4630 } 4631 *offset = length; 4632 return (NULL); 4633 } 4634 } 4635 } /* end if !SCTP_COOKIE_ECHO */ 4636 /* 4637 * process all control chunks... 4638 */ 4639 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4640 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4641 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4642 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4643 /* implied cookie-ack.. we must have lost the ack */ 4644 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4645 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4646 stcb->asoc.overall_error_count, 4647 0, 4648 SCTP_FROM_SCTP_INPUT, 4649 __LINE__); 4650 } 4651 stcb->asoc.overall_error_count = 0; 4652 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4653 *netp); 4654 } 4655process_control_chunks: 4656 while (IS_SCTP_CONTROL(ch)) { 4657 /* validate chunk length */ 4658 chk_length = ntohs(ch->chunk_length); 4659 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4660 ch->chunk_type, chk_length); 4661 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4662 if (chk_length < sizeof(*ch) || 4663 (*offset + (int)chk_length) > length) { 4664 *offset = length; 4665 if (locked_tcb) { 4666 SCTP_TCB_UNLOCK(locked_tcb); 4667 } 4668 return (NULL); 4669 } 4670 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4671 /* 4672 * INIT-ACK only gets the init ack "header" portion only 4673 * because we don't have to process the peer's COOKIE. All 4674 * others get a complete chunk. 4675 */ 4676 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4677 (ch->chunk_type == SCTP_INITIATION)) { 4678 /* get an init-ack chunk */ 4679 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4680 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4681 if (ch == NULL) { 4682 *offset = length; 4683 if (locked_tcb) { 4684 SCTP_TCB_UNLOCK(locked_tcb); 4685 } 4686 return (NULL); 4687 } 4688 } else { 4689 /* For cookies and all other chunks. */ 4690 if (chk_length > sizeof(chunk_buf)) { 4691 /* 4692 * use just the size of the chunk buffer so 4693 * the front part of our chunks fit in 4694 * contiguous space up to the chunk buffer 4695 * size (508 bytes). For chunks that need to 4696 * get more than that they must use the 4697 * sctp_m_getptr() function or other means 4698 * (e.g. know how to parse mbuf chains). 4699 * Cookies do this already. 4700 */ 4701 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4702 (sizeof(chunk_buf) - 4), 4703 chunk_buf); 4704 if (ch == NULL) { 4705 *offset = length; 4706 if (locked_tcb) { 4707 SCTP_TCB_UNLOCK(locked_tcb); 4708 } 4709 return (NULL); 4710 } 4711 } else { 4712 /* We can fit it all */ 4713 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4714 chk_length, chunk_buf); 4715 if (ch == NULL) { 4716 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4717 *offset = length; 4718 if (locked_tcb) { 4719 SCTP_TCB_UNLOCK(locked_tcb); 4720 } 4721 return (NULL); 4722 } 4723 } 4724 } 4725 num_chunks++; 4726 /* Save off the last place we got a control from */ 4727 if (stcb != NULL) { 4728 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4729 /* 4730 * allow last_control to be NULL if 4731 * ASCONF... ASCONF processing will find the 4732 * right net later 4733 */ 4734 if ((netp != NULL) && (*netp != NULL)) 4735 stcb->asoc.last_control_chunk_from = *netp; 4736 } 4737 } 4738#ifdef SCTP_AUDITING_ENABLED 4739 sctp_audit_log(0xB0, ch->chunk_type); 4740#endif 4741 4742 /* check to see if this chunk required auth, but isn't */ 4743 if ((stcb != NULL) && 4744 (stcb->asoc.auth_supported == 1) && 4745 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4746 !stcb->asoc.authenticated) { 4747 /* "silently" ignore */ 4748 SCTP_STAT_INCR(sctps_recvauthmissing); 4749 goto next_chunk; 4750 } 4751 switch (ch->chunk_type) { 4752 case SCTP_INITIATION: 4753 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4754 /* The INIT chunk must be the only chunk. */ 4755 if ((num_chunks > 1) || 4756 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4757 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4758 "INIT not the only chunk"); 4759 sctp_abort_association(inp, stcb, m, iphlen, 4760 src, dst, sh, op_err, 4761 mflowtype, mflowid, 4762 vrf_id, port); 4763 *offset = length; 4764 return (NULL); 4765 } 4766 /* Honor our resource limit. */ 4767 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4768 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4769 sctp_abort_association(inp, stcb, m, iphlen, 4770 src, dst, sh, op_err, 4771 mflowtype, mflowid, 4772 vrf_id, port); 4773 *offset = length; 4774 return (NULL); 4775 } 4776 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4777 (struct sctp_init_chunk *)ch, inp, 4778 stcb, &abort_no_unlock, 4779 mflowtype, mflowid, 4780 vrf_id, port); 4781 *offset = length; 4782 if ((!abort_no_unlock) && (locked_tcb)) { 4783 SCTP_TCB_UNLOCK(locked_tcb); 4784 } 4785 return (NULL); 4786 break; 4787 case SCTP_PAD_CHUNK: 4788 break; 4789 case SCTP_INITIATION_ACK: 4790 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4791 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4792 /* We are not interested anymore */ 4793 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4794 ; 4795 } else { 4796 if (locked_tcb != stcb) { 4797 /* Very unlikely */ 4798 SCTP_TCB_UNLOCK(locked_tcb); 4799 } 4800 *offset = length; 4801 if (stcb) { 4802#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4803 so = SCTP_INP_SO(inp); 4804 atomic_add_int(&stcb->asoc.refcnt, 1); 4805 SCTP_TCB_UNLOCK(stcb); 4806 SCTP_SOCKET_LOCK(so, 1); 4807 SCTP_TCB_LOCK(stcb); 4808 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4809#endif 4810 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4811 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4812#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4813 SCTP_SOCKET_UNLOCK(so, 1); 4814#endif 4815 } 4816 return (NULL); 4817 } 4818 } 4819 /* The INIT-ACK chunk must be the only chunk. */ 4820 if ((num_chunks > 1) || 4821 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4822 *offset = length; 4823 if (locked_tcb) { 4824 SCTP_TCB_UNLOCK(locked_tcb); 4825 } 4826 return (NULL); 4827 } 4828 if ((netp) && (*netp)) { 4829 ret = sctp_handle_init_ack(m, iphlen, *offset, 4830 src, dst, sh, 4831 (struct sctp_init_ack_chunk *)ch, 4832 stcb, *netp, 4833 &abort_no_unlock, 4834 mflowtype, mflowid, 4835 vrf_id); 4836 } else { 4837 ret = -1; 4838 } 4839 *offset = length; 4840 if (abort_no_unlock) { 4841 return (NULL); 4842 } 4843 /* 4844 * Special case, I must call the output routine to 4845 * get the cookie echoed 4846 */ 4847 if ((stcb != NULL) && (ret == 0)) { 4848 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4849 } 4850 if (locked_tcb) { 4851 SCTP_TCB_UNLOCK(locked_tcb); 4852 } 4853 return (NULL); 4854 break; 4855 case SCTP_SELECTIVE_ACK: 4856 { 4857 struct sctp_sack_chunk *sack; 4858 int abort_now = 0; 4859 uint32_t a_rwnd, cum_ack; 4860 uint16_t num_seg, num_dup; 4861 uint8_t flags; 4862 int offset_seg, offset_dup; 4863 4864 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4865 SCTP_STAT_INCR(sctps_recvsacks); 4866 if (stcb == NULL) { 4867 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4868 break; 4869 } 4870 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4871 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4872 break; 4873 } 4874 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4875 /*- 4876 * If we have sent a shutdown-ack, we will pay no 4877 * attention to a sack sent in to us since 4878 * we don't care anymore. 4879 */ 4880 break; 4881 } 4882 sack = (struct sctp_sack_chunk *)ch; 4883 flags = ch->chunk_flags; 4884 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4885 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4886 num_dup = ntohs(sack->sack.num_dup_tsns); 4887 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4888 if (sizeof(struct sctp_sack_chunk) + 4889 num_seg * sizeof(struct sctp_gap_ack_block) + 4890 num_dup * sizeof(uint32_t) != chk_length) { 4891 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4892 break; 4893 } 4894 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4895 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4896 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4897 cum_ack, num_seg, a_rwnd); 4898 stcb->asoc.seen_a_sack_this_pkt = 1; 4899 if ((stcb->asoc.pr_sctp_cnt == 0) && 4900 (num_seg == 0) && 4901 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4902 (stcb->asoc.saw_sack_with_frags == 0) && 4903 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4904 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4905 ) { 4906 /* 4907 * We have a SIMPLE sack having no 4908 * prior segments and data on sent 4909 * queue to be acked.. Use the 4910 * faster path sack processing. We 4911 * also allow window update sacks 4912 * with no missing segments to go 4913 * this way too. 4914 */ 4915 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4916 } else { 4917 if (netp && *netp) 4918 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4919 num_seg, 0, num_dup, &abort_now, flags, 4920 cum_ack, a_rwnd, ecne_seen); 4921 } 4922 if (abort_now) { 4923 /* ABORT signal from sack processing */ 4924 *offset = length; 4925 return (NULL); 4926 } 4927 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4928 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4929 (stcb->asoc.stream_queue_cnt == 0)) { 4930 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4931 } 4932 } 4933 break; 4934 /* 4935 * EY - nr_sack: If the received chunk is an 4936 * nr_sack chunk 4937 */ 4938 case SCTP_NR_SELECTIVE_ACK: 4939 { 4940 struct sctp_nr_sack_chunk *nr_sack; 4941 int abort_now = 0; 4942 uint32_t a_rwnd, cum_ack; 4943 uint16_t num_seg, num_nr_seg, num_dup; 4944 uint8_t flags; 4945 int offset_seg, offset_dup; 4946 4947 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4948 SCTP_STAT_INCR(sctps_recvsacks); 4949 if (stcb == NULL) { 4950 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4951 break; 4952 } 4953 if (stcb->asoc.nrsack_supported == 0) { 4954 goto unknown_chunk; 4955 } 4956 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4957 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4958 break; 4959 } 4960 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4961 /*- 4962 * If we have sent a shutdown-ack, we will pay no 4963 * attention to a sack sent in to us since 4964 * we don't care anymore. 4965 */ 4966 break; 4967 } 4968 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4969 flags = ch->chunk_flags; 4970 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4971 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4972 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4973 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4974 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4975 if (sizeof(struct sctp_nr_sack_chunk) + 4976 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4977 num_dup * sizeof(uint32_t) != chk_length) { 4978 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4979 break; 4980 } 4981 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4982 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4983 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4984 cum_ack, num_seg, a_rwnd); 4985 stcb->asoc.seen_a_sack_this_pkt = 1; 4986 if ((stcb->asoc.pr_sctp_cnt == 0) && 4987 (num_seg == 0) && (num_nr_seg == 0) && 4988 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4989 (stcb->asoc.saw_sack_with_frags == 0) && 4990 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4991 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4992 /* 4993 * We have a SIMPLE sack having no 4994 * prior segments and data on sent 4995 * queue to be acked. Use the faster 4996 * path sack processing. We also 4997 * allow window update sacks with no 4998 * missing segments to go this way 4999 * too. 5000 */ 5001 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5002 &abort_now, ecne_seen); 5003 } else { 5004 if (netp && *netp) 5005 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5006 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5007 cum_ack, a_rwnd, ecne_seen); 5008 } 5009 if (abort_now) { 5010 /* ABORT signal from sack processing */ 5011 *offset = length; 5012 return (NULL); 5013 } 5014 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5015 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5016 (stcb->asoc.stream_queue_cnt == 0)) { 5017 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5018 } 5019 } 5020 break; 5021 5022 case SCTP_HEARTBEAT_REQUEST: 5023 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5024 if ((stcb) && netp && *netp) { 5025 SCTP_STAT_INCR(sctps_recvheartbeat); 5026 sctp_send_heartbeat_ack(stcb, m, *offset, 5027 chk_length, *netp); 5028 5029 /* He's alive so give him credit */ 5030 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5031 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5032 stcb->asoc.overall_error_count, 5033 0, 5034 SCTP_FROM_SCTP_INPUT, 5035 __LINE__); 5036 } 5037 stcb->asoc.overall_error_count = 0; 5038 } 5039 break; 5040 case SCTP_HEARTBEAT_ACK: 5041 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5042 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5043 /* Its not ours */ 5044 *offset = length; 5045 if (locked_tcb) { 5046 SCTP_TCB_UNLOCK(locked_tcb); 5047 } 5048 return (NULL); 5049 } 5050 /* He's alive so give him credit */ 5051 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5052 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5053 stcb->asoc.overall_error_count, 5054 0, 5055 SCTP_FROM_SCTP_INPUT, 5056 __LINE__); 5057 } 5058 stcb->asoc.overall_error_count = 0; 5059 SCTP_STAT_INCR(sctps_recvheartbeatack); 5060 if (netp && *netp) 5061 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5062 stcb, *netp); 5063 break; 5064 case SCTP_ABORT_ASSOCIATION: 5065 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5066 (void *)stcb); 5067 if ((stcb) && netp && *netp) 5068 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5069 stcb, *netp); 5070 *offset = length; 5071 return (NULL); 5072 break; 5073 case SCTP_SHUTDOWN: 5074 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5075 (void *)stcb); 5076 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5077 *offset = length; 5078 if (locked_tcb) { 5079 SCTP_TCB_UNLOCK(locked_tcb); 5080 } 5081 return (NULL); 5082 } 5083 if (netp && *netp) { 5084 int abort_flag = 0; 5085 5086 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5087 stcb, *netp, &abort_flag); 5088 if (abort_flag) { 5089 *offset = length; 5090 return (NULL); 5091 } 5092 } 5093 break; 5094 case SCTP_SHUTDOWN_ACK: 5095 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5096 if ((stcb) && (netp) && (*netp)) 5097 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5098 *offset = length; 5099 return (NULL); 5100 break; 5101 5102 case SCTP_OPERATION_ERROR: 5103 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5104 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5105 *offset = length; 5106 return (NULL); 5107 } 5108 break; 5109 case SCTP_COOKIE_ECHO: 5110 SCTPDBG(SCTP_DEBUG_INPUT3, 5111 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5112 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5113 ; 5114 } else { 5115 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5116 /* We are not interested anymore */ 5117 abend: 5118 if (stcb) { 5119 SCTP_TCB_UNLOCK(stcb); 5120 } 5121 *offset = length; 5122 return (NULL); 5123 } 5124 } 5125 /* 5126 * First are we accepting? We do this again here 5127 * since it is possible that a previous endpoint WAS 5128 * listening responded to a INIT-ACK and then 5129 * closed. We opened and bound.. and are now no 5130 * longer listening. 5131 */ 5132 5133 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5134 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5135 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5136 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5137 sctp_abort_association(inp, stcb, m, iphlen, 5138 src, dst, sh, op_err, 5139 mflowtype, mflowid, 5140 vrf_id, port); 5141 } 5142 *offset = length; 5143 return (NULL); 5144 } else { 5145 struct mbuf *ret_buf; 5146 struct sctp_inpcb *linp; 5147 5148 if (stcb) { 5149 linp = NULL; 5150 } else { 5151 linp = inp; 5152 } 5153 5154 if (linp) { 5155 SCTP_ASOC_CREATE_LOCK(linp); 5156 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5157 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5158 SCTP_ASOC_CREATE_UNLOCK(linp); 5159 goto abend; 5160 } 5161 } 5162 if (netp) { 5163 ret_buf = 5164 sctp_handle_cookie_echo(m, iphlen, 5165 *offset, 5166 src, dst, 5167 sh, 5168 (struct sctp_cookie_echo_chunk *)ch, 5169 &inp, &stcb, netp, 5170 auth_skipped, 5171 auth_offset, 5172 auth_len, 5173 &locked_tcb, 5174 mflowtype, 5175 mflowid, 5176 vrf_id, 5177 port); 5178 } else { 5179 ret_buf = NULL; 5180 } 5181 if (linp) { 5182 SCTP_ASOC_CREATE_UNLOCK(linp); 5183 } 5184 if (ret_buf == NULL) { 5185 if (locked_tcb) { 5186 SCTP_TCB_UNLOCK(locked_tcb); 5187 } 5188 SCTPDBG(SCTP_DEBUG_INPUT3, 5189 "GAK, null buffer\n"); 5190 *offset = length; 5191 return (NULL); 5192 } 5193 /* if AUTH skipped, see if it verified... */ 5194 if (auth_skipped) { 5195 got_auth = 1; 5196 auth_skipped = 0; 5197 } 5198 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5199 /* 5200 * Restart the timer if we have 5201 * pending data 5202 */ 5203 struct sctp_tmit_chunk *chk; 5204 5205 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5206 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5207 } 5208 } 5209 break; 5210 case SCTP_COOKIE_ACK: 5211 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5212 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5213 if (locked_tcb) { 5214 SCTP_TCB_UNLOCK(locked_tcb); 5215 } 5216 return (NULL); 5217 } 5218 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5219 /* We are not interested anymore */ 5220 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5221 ; 5222 } else if (stcb) { 5223#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5224 so = SCTP_INP_SO(inp); 5225 atomic_add_int(&stcb->asoc.refcnt, 1); 5226 SCTP_TCB_UNLOCK(stcb); 5227 SCTP_SOCKET_LOCK(so, 1); 5228 SCTP_TCB_LOCK(stcb); 5229 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5230#endif 5231 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5232 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5233#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5234 SCTP_SOCKET_UNLOCK(so, 1); 5235#endif 5236 *offset = length; 5237 return (NULL); 5238 } 5239 } 5240 /* He's alive so give him credit */ 5241 if ((stcb) && netp && *netp) { 5242 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5243 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5244 stcb->asoc.overall_error_count, 5245 0, 5246 SCTP_FROM_SCTP_INPUT, 5247 __LINE__); 5248 } 5249 stcb->asoc.overall_error_count = 0; 5250 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5251 } 5252 break; 5253 case SCTP_ECN_ECHO: 5254 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5255 /* He's alive so give him credit */ 5256 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5257 /* Its not ours */ 5258 if (locked_tcb) { 5259 SCTP_TCB_UNLOCK(locked_tcb); 5260 } 5261 *offset = length; 5262 return (NULL); 5263 } 5264 if (stcb) { 5265 if (stcb->asoc.ecn_supported == 0) { 5266 goto unknown_chunk; 5267 } 5268 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5269 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5270 stcb->asoc.overall_error_count, 5271 0, 5272 SCTP_FROM_SCTP_INPUT, 5273 __LINE__); 5274 } 5275 stcb->asoc.overall_error_count = 0; 5276 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5277 stcb); 5278 ecne_seen = 1; 5279 } 5280 break; 5281 case SCTP_ECN_CWR: 5282 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5283 /* He's alive so give him credit */ 5284 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5285 /* Its not ours */ 5286 if (locked_tcb) { 5287 SCTP_TCB_UNLOCK(locked_tcb); 5288 } 5289 *offset = length; 5290 return (NULL); 5291 } 5292 if (stcb) { 5293 if (stcb->asoc.ecn_supported == 0) { 5294 goto unknown_chunk; 5295 } 5296 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5297 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5298 stcb->asoc.overall_error_count, 5299 0, 5300 SCTP_FROM_SCTP_INPUT, 5301 __LINE__); 5302 } 5303 stcb->asoc.overall_error_count = 0; 5304 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5305 } 5306 break; 5307 case SCTP_SHUTDOWN_COMPLETE: 5308 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5309 /* must be first and only chunk */ 5310 if ((num_chunks > 1) || 5311 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5312 *offset = length; 5313 if (locked_tcb) { 5314 SCTP_TCB_UNLOCK(locked_tcb); 5315 } 5316 return (NULL); 5317 } 5318 if ((stcb) && netp && *netp) { 5319 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5320 stcb, *netp); 5321 } 5322 *offset = length; 5323 return (NULL); 5324 break; 5325 case SCTP_ASCONF: 5326 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5327 /* He's alive so give him credit */ 5328 if (stcb) { 5329 if (stcb->asoc.asconf_supported == 0) { 5330 goto unknown_chunk; 5331 } 5332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5333 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5334 stcb->asoc.overall_error_count, 5335 0, 5336 SCTP_FROM_SCTP_INPUT, 5337 __LINE__); 5338 } 5339 stcb->asoc.overall_error_count = 0; 5340 sctp_handle_asconf(m, *offset, src, 5341 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5342 asconf_cnt++; 5343 } 5344 break; 5345 case SCTP_ASCONF_ACK: 5346 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5347 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5348 /* Its not ours */ 5349 if (locked_tcb) { 5350 SCTP_TCB_UNLOCK(locked_tcb); 5351 } 5352 *offset = length; 5353 return (NULL); 5354 } 5355 if ((stcb) && netp && *netp) { 5356 if (stcb->asoc.asconf_supported == 0) { 5357 goto unknown_chunk; 5358 } 5359 /* He's alive so give him credit */ 5360 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5361 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5362 stcb->asoc.overall_error_count, 5363 0, 5364 SCTP_FROM_SCTP_INPUT, 5365 __LINE__); 5366 } 5367 stcb->asoc.overall_error_count = 0; 5368 sctp_handle_asconf_ack(m, *offset, 5369 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5370 if (abort_no_unlock) 5371 return (NULL); 5372 } 5373 break; 5374 case SCTP_FORWARD_CUM_TSN: 5375 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5376 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5377 /* Its not ours */ 5378 if (locked_tcb) { 5379 SCTP_TCB_UNLOCK(locked_tcb); 5380 } 5381 *offset = length; 5382 return (NULL); 5383 } 5384 /* He's alive so give him credit */ 5385 if (stcb) { 5386 int abort_flag = 0; 5387 5388 if (stcb->asoc.prsctp_supported == 0) { 5389 goto unknown_chunk; 5390 } 5391 stcb->asoc.overall_error_count = 0; 5392 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5393 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5394 stcb->asoc.overall_error_count, 5395 0, 5396 SCTP_FROM_SCTP_INPUT, 5397 __LINE__); 5398 } 5399 *fwd_tsn_seen = 1; 5400 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5401 /* We are not interested anymore */ 5402#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5403 so = SCTP_INP_SO(inp); 5404 atomic_add_int(&stcb->asoc.refcnt, 1); 5405 SCTP_TCB_UNLOCK(stcb); 5406 SCTP_SOCKET_LOCK(so, 1); 5407 SCTP_TCB_LOCK(stcb); 5408 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5409#endif 5410 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5411 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5412#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5413 SCTP_SOCKET_UNLOCK(so, 1); 5414#endif 5415 *offset = length; 5416 return (NULL); 5417 } 5418 sctp_handle_forward_tsn(stcb, 5419 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5420 if (abort_flag) { 5421 *offset = length; 5422 return (NULL); 5423 } else { 5424 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5425 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5426 stcb->asoc.overall_error_count, 5427 0, 5428 SCTP_FROM_SCTP_INPUT, 5429 __LINE__); 5430 } 5431 stcb->asoc.overall_error_count = 0; 5432 } 5433 5434 } 5435 break; 5436 case SCTP_STREAM_RESET: 5437 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5438 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5439 /* Its not ours */ 5440 if (locked_tcb) { 5441 SCTP_TCB_UNLOCK(locked_tcb); 5442 } 5443 *offset = length; 5444 return (NULL); 5445 } 5446 if (stcb->asoc.reconfig_supported == 0) { 5447 goto unknown_chunk; 5448 } 5449 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5450 /* stop processing */ 5451 *offset = length; 5452 return (NULL); 5453 } 5454 break; 5455 case SCTP_PACKET_DROPPED: 5456 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5457 /* re-get it all please */ 5458 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5459 /* Its not ours */ 5460 if (locked_tcb) { 5461 SCTP_TCB_UNLOCK(locked_tcb); 5462 } 5463 *offset = length; 5464 return (NULL); 5465 } 5466 if (ch && (stcb) && netp && (*netp)) { 5467 if (stcb->asoc.pktdrop_supported == 0) { 5468 goto unknown_chunk; 5469 } 5470 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5471 stcb, *netp, 5472 min(chk_length, (sizeof(chunk_buf) - 4))); 5473 5474 } 5475 break; 5476 case SCTP_AUTHENTICATION: 5477 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5478 if (stcb == NULL) { 5479 /* save the first AUTH for later processing */ 5480 if (auth_skipped == 0) { 5481 auth_offset = *offset; 5482 auth_len = chk_length; 5483 auth_skipped = 1; 5484 } 5485 /* skip this chunk (temporarily) */ 5486 goto next_chunk; 5487 } 5488 if (stcb->asoc.auth_supported == 0) { 5489 goto unknown_chunk; 5490 } 5491 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5492 (chk_length > (sizeof(struct sctp_auth_chunk) + 5493 SCTP_AUTH_DIGEST_LEN_MAX))) { 5494 /* Its not ours */ 5495 if (locked_tcb) { 5496 SCTP_TCB_UNLOCK(locked_tcb); 5497 } 5498 *offset = length; 5499 return (NULL); 5500 } 5501 if (got_auth == 1) { 5502 /* skip this chunk... it's already auth'd */ 5503 goto next_chunk; 5504 } 5505 got_auth = 1; 5506 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5507 m, *offset)) { 5508 /* auth HMAC failed so dump the packet */ 5509 *offset = length; 5510 return (stcb); 5511 } else { 5512 /* remaining chunks are HMAC checked */ 5513 stcb->asoc.authenticated = 1; 5514 } 5515 break; 5516 5517 default: 5518 unknown_chunk: 5519 /* it's an unknown chunk! */ 5520 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5521 struct mbuf *mm; 5522 struct sctp_paramhdr *phd; 5523 int len; 5524 5525 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5526 0, M_NOWAIT, 1, MT_DATA); 5527 if (mm) { 5528 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5529 phd = mtod(mm, struct sctp_paramhdr *); 5530 /* 5531 * We cheat and use param type since 5532 * we did not bother to define a 5533 * error cause struct. They are the 5534 * same basic format with different 5535 * names. 5536 */ 5537 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5538 phd->param_length = htons(len + sizeof(*phd)); 5539 SCTP_BUF_LEN(mm) = sizeof(*phd); 5540 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5541 if (SCTP_BUF_NEXT(mm)) { 5542 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5543 sctp_m_freem(mm); 5544 } else { 5545#ifdef SCTP_MBUF_LOGGING 5546 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5547 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5548 } 5549#endif 5550 sctp_queue_op_err(stcb, mm); 5551 } 5552 } else { 5553 sctp_m_freem(mm); 5554 } 5555 } 5556 } 5557 if ((ch->chunk_type & 0x80) == 0) { 5558 /* discard this packet */ 5559 *offset = length; 5560 return (stcb); 5561 } /* else skip this bad chunk and continue... */ 5562 break; 5563 } /* switch (ch->chunk_type) */ 5564 5565 5566next_chunk: 5567 /* get the next chunk */ 5568 *offset += SCTP_SIZE32(chk_length); 5569 if (*offset >= length) { 5570 /* no more data left in the mbuf chain */ 5571 break; 5572 } 5573 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5574 sizeof(struct sctp_chunkhdr), chunk_buf); 5575 if (ch == NULL) { 5576 if (locked_tcb) { 5577 SCTP_TCB_UNLOCK(locked_tcb); 5578 } 5579 *offset = length; 5580 return (NULL); 5581 } 5582 } /* while */ 5583 5584 if (asconf_cnt > 0 && stcb != NULL) { 5585 sctp_send_asconf_ack(stcb); 5586 } 5587 return (stcb); 5588} 5589 5590 5591#ifdef INVARIANTS 5592#ifdef __GNUC__ 5593__attribute__((noinline)) 5594#endif 5595 void 5596 sctp_validate_no_locks(struct sctp_inpcb *inp) 5597{ 5598 struct sctp_tcb *lstcb; 5599 5600 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5601 if (mtx_owned(&lstcb->tcb_mtx)) { 5602 panic("Own lock on stcb at return from input"); 5603 } 5604 } 5605 if (mtx_owned(&inp->inp_create_mtx)) { 5606 panic("Own create lock on inp"); 5607 } 5608 if (mtx_owned(&inp->inp_mtx)) { 5609 panic("Own inp lock on inp"); 5610 } 5611} 5612 5613#endif 5614 5615/* 5616 * common input chunk processing (v4 and v6) 5617 */ 5618void 5619sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5620 struct sockaddr *src, struct sockaddr *dst, 5621 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5622#if !defined(SCTP_WITH_NO_CSUM) 5623 uint8_t compute_crc, 5624#endif 5625 uint8_t ecn_bits, 5626 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5627 uint32_t vrf_id, uint16_t port) 5628{ 5629 uint32_t high_tsn; 5630 int fwd_tsn_seen = 0, data_processed = 0; 5631 struct mbuf *m = *mm, *op_err; 5632 char msg[SCTP_DIAG_INFO_LEN]; 5633 int un_sent; 5634 int cnt_ctrl_ready = 0; 5635 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5636 struct sctp_tcb *stcb = NULL; 5637 struct sctp_nets *net = NULL; 5638 5639 SCTP_STAT_INCR(sctps_recvdatagrams); 5640#ifdef SCTP_AUDITING_ENABLED 5641 sctp_audit_log(0xE0, 1); 5642 sctp_auditing(0, inp, stcb, net); 5643#endif 5644#if !defined(SCTP_WITH_NO_CSUM) 5645 if (compute_crc != 0) { 5646 uint32_t check, calc_check; 5647 5648 check = sh->checksum; 5649 sh->checksum = 0; 5650 calc_check = sctp_calculate_cksum(m, iphlen); 5651 sh->checksum = check; 5652 if (calc_check != check) { 5653 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5654 calc_check, check, (void *)m, length, iphlen); 5655 stcb = sctp_findassociation_addr(m, offset, src, dst, 5656 sh, ch, &inp, &net, vrf_id); 5657#if defined(INET) || defined(INET6) 5658 if ((net != NULL) && (port != 0)) { 5659 if (net->port == 0) { 5660 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5661 } 5662 net->port = port; 5663 } 5664#endif 5665 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5666 net->flowtype = mflowtype; 5667 } 5668 if ((inp != NULL) && (stcb != NULL)) { 5669 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5670 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5671 } else if ((inp != NULL) && (stcb == NULL)) { 5672 inp_decr = inp; 5673 } 5674 SCTP_STAT_INCR(sctps_badsum); 5675 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5676 goto out; 5677 } 5678 } 5679#endif 5680 /* Destination port of 0 is illegal, based on RFC4960. */ 5681 if (sh->dest_port == 0) { 5682 SCTP_STAT_INCR(sctps_hdrops); 5683 goto out; 5684 } 5685 stcb = sctp_findassociation_addr(m, offset, src, dst, 5686 sh, ch, &inp, &net, vrf_id); 5687#if defined(INET) || defined(INET6) 5688 if ((net != NULL) && (port != 0)) { 5689 if (net->port == 0) { 5690 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5691 } 5692 net->port = port; 5693 } 5694#endif 5695 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5696 net->flowtype = mflowtype; 5697 } 5698 if (inp == NULL) { 5699 SCTP_STAT_INCR(sctps_noport); 5700 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5701 goto out; 5702 } 5703 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5704 sctp_send_shutdown_complete2(src, dst, sh, 5705 mflowtype, mflowid, fibnum, 5706 vrf_id, port); 5707 goto out; 5708 } 5709 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5710 goto out; 5711 } 5712 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5713 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5714 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5715 (ch->chunk_type != SCTP_INIT))) { 5716 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5717 "Out of the blue"); 5718 sctp_send_abort(m, iphlen, src, dst, 5719 sh, 0, op_err, 5720 mflowtype, mflowid, fibnum, 5721 vrf_id, port); 5722 } 5723 } 5724 goto out; 5725 } else if (stcb == NULL) { 5726 inp_decr = inp; 5727 } 5728#ifdef IPSEC 5729 /*- 5730 * I very much doubt any of the IPSEC stuff will work but I have no 5731 * idea, so I will leave it in place. 5732 */ 5733 if (inp != NULL) { 5734 switch (dst->sa_family) { 5735#ifdef INET 5736 case AF_INET: 5737 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5738 IPSECSTAT_INC(ips_in_polvio); 5739 SCTP_STAT_INCR(sctps_hdrops); 5740 goto out; 5741 } 5742 break; 5743#endif 5744#ifdef INET6 5745 case AF_INET6: 5746 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5747 IPSEC6STAT_INC(ips_in_polvio); 5748 SCTP_STAT_INCR(sctps_hdrops); 5749 goto out; 5750 } 5751 break; 5752#endif 5753 default: 5754 break; 5755 } 5756 } 5757#endif 5758 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5759 (void *)m, iphlen, offset, length, (void *)stcb); 5760 if (stcb) { 5761 /* always clear this before beginning a packet */ 5762 stcb->asoc.authenticated = 0; 5763 stcb->asoc.seen_a_sack_this_pkt = 0; 5764 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5765 (void *)stcb, stcb->asoc.state); 5766 5767 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5768 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5769 /*- 5770 * If we hit here, we had a ref count 5771 * up when the assoc was aborted and the 5772 * timer is clearing out the assoc, we should 5773 * NOT respond to any packet.. its OOTB. 5774 */ 5775 SCTP_TCB_UNLOCK(stcb); 5776 stcb = NULL; 5777 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5778 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5779 msg); 5780 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5781 mflowtype, mflowid, inp->fibnum, 5782 vrf_id, port); 5783 goto out; 5784 } 5785 } 5786 if (IS_SCTP_CONTROL(ch)) { 5787 /* process the control portion of the SCTP packet */ 5788 /* sa_ignore NO_NULL_CHK */ 5789 stcb = sctp_process_control(m, iphlen, &offset, length, 5790 src, dst, sh, ch, 5791 inp, stcb, &net, &fwd_tsn_seen, 5792 mflowtype, mflowid, fibnum, 5793 vrf_id, port); 5794 if (stcb) { 5795 /* 5796 * This covers us if the cookie-echo was there and 5797 * it changes our INP. 5798 */ 5799 inp = stcb->sctp_ep; 5800#if defined(INET) || defined(INET6) 5801 if ((net) && (port)) { 5802 if (net->port == 0) { 5803 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5804 } 5805 net->port = port; 5806 } 5807#endif 5808 } 5809 } else { 5810 /* 5811 * no control chunks, so pre-process DATA chunks (these 5812 * checks are taken care of by control processing) 5813 */ 5814 5815 /* 5816 * if DATA only packet, and auth is required, then punt... 5817 * can't have authenticated without any AUTH (control) 5818 * chunks 5819 */ 5820 if ((stcb != NULL) && 5821 (stcb->asoc.auth_supported == 1) && 5822 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5823 /* "silently" ignore */ 5824 SCTP_STAT_INCR(sctps_recvauthmissing); 5825 goto out; 5826 } 5827 if (stcb == NULL) { 5828 /* out of the blue DATA chunk */ 5829 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5830 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5831 msg); 5832 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5833 mflowtype, mflowid, fibnum, 5834 vrf_id, port); 5835 goto out; 5836 } 5837 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5838 /* v_tag mismatch! */ 5839 SCTP_STAT_INCR(sctps_badvtag); 5840 goto out; 5841 } 5842 } 5843 5844 if (stcb == NULL) { 5845 /* 5846 * no valid TCB for this packet, or we found it's a bad 5847 * packet while processing control, or we're done with this 5848 * packet (done or skip rest of data), so we drop it... 5849 */ 5850 goto out; 5851 } 5852 /* 5853 * DATA chunk processing 5854 */ 5855 /* plow through the data chunks while length > offset */ 5856 5857 /* 5858 * Rest should be DATA only. Check authentication state if AUTH for 5859 * DATA is required. 5860 */ 5861 if ((length > offset) && 5862 (stcb != NULL) && 5863 (stcb->asoc.auth_supported == 1) && 5864 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5865 !stcb->asoc.authenticated) { 5866 /* "silently" ignore */ 5867 SCTP_STAT_INCR(sctps_recvauthmissing); 5868 SCTPDBG(SCTP_DEBUG_AUTH1, 5869 "Data chunk requires AUTH, skipped\n"); 5870 goto trigger_send; 5871 } 5872 if (length > offset) { 5873 int retval; 5874 5875 /* 5876 * First check to make sure our state is correct. We would 5877 * not get here unless we really did have a tag, so we don't 5878 * abort if this happens, just dump the chunk silently. 5879 */ 5880 switch (SCTP_GET_STATE(&stcb->asoc)) { 5881 case SCTP_STATE_COOKIE_ECHOED: 5882 /* 5883 * we consider data with valid tags in this state 5884 * shows us the cookie-ack was lost. Imply it was 5885 * there. 5886 */ 5887 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5888 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5889 stcb->asoc.overall_error_count, 5890 0, 5891 SCTP_FROM_SCTP_INPUT, 5892 __LINE__); 5893 } 5894 stcb->asoc.overall_error_count = 0; 5895 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5896 break; 5897 case SCTP_STATE_COOKIE_WAIT: 5898 /* 5899 * We consider OOTB any data sent during asoc setup. 5900 */ 5901 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5902 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5903 msg); 5904 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5905 mflowtype, mflowid, inp->fibnum, 5906 vrf_id, port); 5907 goto out; 5908 /* sa_ignore NOTREACHED */ 5909 break; 5910 case SCTP_STATE_EMPTY: /* should not happen */ 5911 case SCTP_STATE_INUSE: /* should not happen */ 5912 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5913 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5914 default: 5915 goto out; 5916 /* sa_ignore NOTREACHED */ 5917 break; 5918 case SCTP_STATE_OPEN: 5919 case SCTP_STATE_SHUTDOWN_SENT: 5920 break; 5921 } 5922 /* plow through the data chunks while length > offset */ 5923 retval = sctp_process_data(mm, iphlen, &offset, length, 5924 src, dst, sh, 5925 inp, stcb, net, &high_tsn, 5926 mflowtype, mflowid, 5927 vrf_id, port); 5928 if (retval == 2) { 5929 /* 5930 * The association aborted, NO UNLOCK needed since 5931 * the association is destroyed. 5932 */ 5933 stcb = NULL; 5934 goto out; 5935 } 5936 data_processed = 1; 5937 /* 5938 * Anything important needs to have been m_copy'ed in 5939 * process_data 5940 */ 5941 } 5942 /* take care of ecn */ 5943 if ((data_processed == 1) && 5944 (stcb->asoc.ecn_supported == 1) && 5945 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5946 /* Yep, we need to add a ECNE */ 5947 sctp_send_ecn_echo(stcb, net, high_tsn); 5948 } 5949 if ((data_processed == 0) && (fwd_tsn_seen)) { 5950 int was_a_gap; 5951 uint32_t highest_tsn; 5952 5953 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5954 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5955 } else { 5956 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5957 } 5958 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5959 stcb->asoc.send_sack = 1; 5960 sctp_sack_check(stcb, was_a_gap); 5961 } else if (fwd_tsn_seen) { 5962 stcb->asoc.send_sack = 1; 5963 } 5964 /* trigger send of any chunks in queue... */ 5965trigger_send: 5966#ifdef SCTP_AUDITING_ENABLED 5967 sctp_audit_log(0xE0, 2); 5968 sctp_auditing(1, inp, stcb, net); 5969#endif 5970 SCTPDBG(SCTP_DEBUG_INPUT1, 5971 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5972 stcb->asoc.peers_rwnd, 5973 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5974 stcb->asoc.total_flight); 5975 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5976 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5977 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5978 } 5979 if (cnt_ctrl_ready || 5980 ((un_sent) && 5981 (stcb->asoc.peers_rwnd > 0 || 5982 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5983 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5984 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5985 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5986 } 5987#ifdef SCTP_AUDITING_ENABLED 5988 sctp_audit_log(0xE0, 3); 5989 sctp_auditing(2, inp, stcb, net); 5990#endif 5991out: 5992 if (stcb != NULL) { 5993 SCTP_TCB_UNLOCK(stcb); 5994 } 5995 if (inp_decr != NULL) { 5996 /* reduce ref-count */ 5997 SCTP_INP_WLOCK(inp_decr); 5998 SCTP_INP_DECR_REF(inp_decr); 5999 SCTP_INP_WUNLOCK(inp_decr); 6000 } 6001#ifdef INVARIANTS 6002 if (inp != NULL) { 6003 sctp_validate_no_locks(inp); 6004 } 6005#endif 6006 return; 6007} 6008 6009#if 0 6010static void 6011sctp_print_mbuf_chain(struct mbuf *m) 6012{ 6013 for (; m; m = SCTP_BUF_NEXT(m)) { 6014 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 6015 if (SCTP_BUF_IS_EXTENDED(m)) 6016 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 6017 } 6018} 6019 6020#endif 6021 6022#ifdef INET 6023void 6024sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6025{ 6026 struct mbuf *m; 6027 int iphlen; 6028 uint32_t vrf_id = 0; 6029 uint8_t ecn_bits; 6030 struct sockaddr_in src, dst; 6031 struct ip *ip; 6032 struct sctphdr *sh; 6033 struct sctp_chunkhdr *ch; 6034 int length, offset; 6035 6036#if !defined(SCTP_WITH_NO_CSUM) 6037 uint8_t compute_crc; 6038 6039#endif 6040 uint32_t mflowid; 6041 uint8_t mflowtype; 6042 uint16_t fibnum; 6043 6044 iphlen = off; 6045 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6046 SCTP_RELEASE_PKT(i_pak); 6047 return; 6048 } 6049 m = SCTP_HEADER_TO_CHAIN(i_pak); 6050#ifdef SCTP_MBUF_LOGGING 6051 /* Log in any input mbufs */ 6052 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6053 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6054 } 6055#endif 6056#ifdef SCTP_PACKET_LOGGING 6057 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6058 sctp_packet_log(m); 6059 } 6060#endif 6061 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6062 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6063 m->m_pkthdr.len, 6064 if_name(m->m_pkthdr.rcvif), 6065 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6066 mflowid = m->m_pkthdr.flowid; 6067 mflowtype = M_HASHTYPE_GET(m); 6068 fibnum = M_GETFIB(m); 6069 SCTP_STAT_INCR(sctps_recvpackets); 6070 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6071 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6072 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6073 if (SCTP_BUF_LEN(m) < offset) { 6074 if ((m = m_pullup(m, offset)) == NULL) { 6075 SCTP_STAT_INCR(sctps_hdrops); 6076 return; 6077 } 6078 } 6079 ip = mtod(m, struct ip *); 6080 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6081 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6082 offset -= sizeof(struct sctp_chunkhdr); 6083 memset(&src, 0, sizeof(struct sockaddr_in)); 6084 src.sin_family = AF_INET; 6085 src.sin_len = sizeof(struct sockaddr_in); 6086 src.sin_port = sh->src_port; 6087 src.sin_addr = ip->ip_src; 6088 memset(&dst, 0, sizeof(struct sockaddr_in)); 6089 dst.sin_family = AF_INET; 6090 dst.sin_len = sizeof(struct sockaddr_in); 6091 dst.sin_port = sh->dest_port; 6092 dst.sin_addr = ip->ip_dst; 6093 length = ntohs(ip->ip_len); 6094 /* Validate mbuf chain length with IP payload length. */ 6095 if (SCTP_HEADER_LEN(m) != length) { 6096 SCTPDBG(SCTP_DEBUG_INPUT1, 6097 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6098 SCTP_STAT_INCR(sctps_hdrops); 6099 goto out; 6100 } 6101 /* SCTP does not allow broadcasts or multicasts */ 6102 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6103 goto out; 6104 } 6105 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6106 goto out; 6107 } 6108 ecn_bits = ip->ip_tos; 6109#if defined(SCTP_WITH_NO_CSUM) 6110 SCTP_STAT_INCR(sctps_recvnocrc); 6111#else 6112 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6113 SCTP_STAT_INCR(sctps_recvhwcrc); 6114 compute_crc = 0; 6115 } else { 6116 SCTP_STAT_INCR(sctps_recvswcrc); 6117 compute_crc = 1; 6118 } 6119#endif 6120 sctp_common_input_processing(&m, iphlen, offset, length, 6121 (struct sockaddr *)&src, 6122 (struct sockaddr *)&dst, 6123 sh, ch, 6124#if !defined(SCTP_WITH_NO_CSUM) 6125 compute_crc, 6126#endif 6127 ecn_bits, 6128 mflowtype, mflowid, fibnum, 6129 vrf_id, port); 6130out: 6131 if (m) { 6132 sctp_m_freem(m); 6133 } 6134 return; 6135} 6136 6137#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6138extern int *sctp_cpuarry; 6139 6140#endif 6141 6142void 6143sctp_input(struct mbuf *m, int off) 6144{ 6145#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6146 struct ip *ip; 6147 struct sctphdr *sh; 6148 int offset; 6149 int cpu_to_use; 6150 uint32_t flowid, tag; 6151 6152 if (mp_ncpus > 1) { 6153 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6154 flowid = m->m_pkthdr.flowid; 6155 } else { 6156 /* 6157 * No flow id built by lower layers fix it so we 6158 * create one. 6159 */ 6160 offset = off + sizeof(struct sctphdr); 6161 if (SCTP_BUF_LEN(m) < offset) { 6162 if ((m = m_pullup(m, offset)) == NULL) { 6163 SCTP_STAT_INCR(sctps_hdrops); 6164 return; 6165 } 6166 } 6167 ip = mtod(m, struct ip *); 6168 sh = (struct sctphdr *)((caddr_t)ip + off); 6169 tag = htonl(sh->v_tag); 6170 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6171 m->m_pkthdr.flowid = flowid; 6172 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6173 } 6174 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6175 sctp_queue_to_mcore(m, off, cpu_to_use); 6176 return; 6177 } 6178#endif 6179 sctp_input_with_port(m, off, 0); 6180} 6181 6182#endif 6183