sctp_input.c revision 283741
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 283741 2015-05-29 13:37:04Z 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, 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_4); 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, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 old_error_counter = r_net->error_count; 640 r_net->error_count = 0; 641 r_net->hb_responded = 1; 642 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 643 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 644 /* Now lets do a RTO with this */ 645 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 646 SCTP_RTT_FROM_NON_DATA); 647 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 648 r_net->dest_state |= SCTP_ADDR_REACHABLE; 649 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 650 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 651 } 652 if (r_net->dest_state & SCTP_ADDR_PF) { 653 r_net->dest_state &= ~SCTP_ADDR_PF; 654 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 655 } 656 if (old_error_counter > 0) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 658 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 659 } 660 if (r_net == stcb->asoc.primary_destination) { 661 if (stcb->asoc.alternate) { 662 /* release the alternate, primary is good */ 663 sctp_free_remote_addr(stcb->asoc.alternate); 664 stcb->asoc.alternate = NULL; 665 } 666 } 667 /* Mobility adaptation */ 668 if (req_prim) { 669 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_BASE) || 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_FASTHANDOFF)) && 673 sctp_is_mobility_feature_on(stcb->sctp_ep, 674 SCTP_MOBILITY_PRIM_DELETED)) { 675 676 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER + SCTP_LOC_7); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691} 692 693static int 694sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695{ 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 703 /* generate a new vtag and send init */ 704 LIST_REMOVE(stcb, sctp_asocs); 705 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 706 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 707 /* 708 * put it in the bucket in the vtag hash of assoc's for the 709 * system 710 */ 711 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 712 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 713 return (1); 714 } 715 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 716 /* 717 * treat like a case where the cookie expired i.e.: - dump 718 * current cookie. - generate a new vtag. - resend init. 719 */ 720 /* generate a new vtag and send init */ 721 LIST_REMOVE(stcb, sctp_asocs); 722 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 723 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 724 sctp_stop_all_cookie_timers(stcb); 725 sctp_toss_old_cookies(stcb, &stcb->asoc); 726 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 727 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 728 /* 729 * put it in the bucket in the vtag hash of assoc's for the 730 * system 731 */ 732 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 733 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 734 return (1); 735 } 736 return (0); 737} 738 739static int 740sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 741 struct sctp_nets *net) 742{ 743 /* 744 * return 0 means we want you to proceed with the abort non-zero 745 * means no abort processing 746 */ 747 if (stcb->asoc.auth_supported == 0) { 748 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 749 return (0); 750 } 751 sctp_asconf_send_nat_state_update(stcb, net); 752 return (1); 753} 754 755 756static void 757sctp_handle_abort(struct sctp_abort_chunk *abort, 758 struct sctp_tcb *stcb, struct sctp_nets *net) 759{ 760#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 761 struct socket *so; 762 763#endif 764 uint16_t len; 765 uint16_t error; 766 767 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 768 if (stcb == NULL) 769 return; 770 771 len = ntohs(abort->ch.chunk_length); 772 if (len > sizeof(struct sctp_chunkhdr)) { 773 /* 774 * Need to check the cause codes for our two magic nat 775 * aborts which don't kill the assoc necessarily. 776 */ 777 struct sctp_missing_nat_state *natc; 778 779 natc = (struct sctp_missing_nat_state *)(abort + 1); 780 error = ntohs(natc->cause); 781 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 782 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 783 abort->ch.chunk_flags); 784 if (sctp_handle_nat_colliding_state(stcb)) { 785 return; 786 } 787 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 788 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 789 abort->ch.chunk_flags); 790 if (sctp_handle_nat_missing_state(stcb, net)) { 791 return; 792 } 793 } 794 } else { 795 error = 0; 796 } 797 /* stop any receive timers */ 798 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 799 /* notify user of the abort and clean up... */ 800 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 801 /* free the tcb */ 802 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 803 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 804 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 805 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 806 } 807#ifdef SCTP_ASOCLOG_OF_TSNS 808 sctp_print_out_track_log(stcb); 809#endif 810#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 811 so = SCTP_INP_SO(stcb->sctp_ep); 812 atomic_add_int(&stcb->asoc.refcnt, 1); 813 SCTP_TCB_UNLOCK(stcb); 814 SCTP_SOCKET_LOCK(so, 1); 815 SCTP_TCB_LOCK(stcb); 816 atomic_subtract_int(&stcb->asoc.refcnt, 1); 817#endif 818 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 819 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 820 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 821#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 822 SCTP_SOCKET_UNLOCK(so, 1); 823#endif 824 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 825} 826 827static void 828sctp_start_net_timers(struct sctp_tcb *stcb) 829{ 830 uint32_t cnt_hb_sent; 831 struct sctp_nets *net; 832 833 cnt_hb_sent = 0; 834 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 835 /* 836 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 837 * If the dest in unconfirmed send a hb as well if under 838 * max_hb_burst have been sent. 839 */ 840 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 841 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 842 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 843 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 844 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 845 cnt_hb_sent++; 846 } 847 } 848 if (cnt_hb_sent) { 849 sctp_chunk_output(stcb->sctp_ep, stcb, 850 SCTP_OUTPUT_FROM_COOKIE_ACK, 851 SCTP_SO_NOT_LOCKED); 852 } 853} 854 855 856static void 857sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 858 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 859{ 860 struct sctp_association *asoc; 861 int some_on_streamwheel; 862 863#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 864 struct socket *so; 865 866#endif 867 868 SCTPDBG(SCTP_DEBUG_INPUT2, 869 "sctp_handle_shutdown: handling SHUTDOWN\n"); 870 if (stcb == NULL) 871 return; 872 asoc = &stcb->asoc; 873 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 874 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 875 return; 876 } 877 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 878 /* Shutdown NOT the expected size */ 879 return; 880 } else { 881 sctp_update_acked(stcb, cp, abort_flag); 882 if (*abort_flag) { 883 return; 884 } 885 } 886 if (asoc->control_pdapi) { 887 /* 888 * With a normal shutdown we assume the end of last record. 889 */ 890 SCTP_INP_READ_LOCK(stcb->sctp_ep); 891 asoc->control_pdapi->end_added = 1; 892 asoc->control_pdapi->pdapi_aborted = 1; 893 asoc->control_pdapi = NULL; 894 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 895#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 so = SCTP_INP_SO(stcb->sctp_ep); 897 atomic_add_int(&stcb->asoc.refcnt, 1); 898 SCTP_TCB_UNLOCK(stcb); 899 SCTP_SOCKET_LOCK(so, 1); 900 SCTP_TCB_LOCK(stcb); 901 atomic_subtract_int(&stcb->asoc.refcnt, 1); 902 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 903 /* assoc was freed while we were unlocked */ 904 SCTP_SOCKET_UNLOCK(so, 1); 905 return; 906 } 907#endif 908 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 909#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 910 SCTP_SOCKET_UNLOCK(so, 1); 911#endif 912 } 913 /* goto SHUTDOWN_RECEIVED state to block new requests */ 914 if (stcb->sctp_socket) { 915 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 916 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 917 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 918 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 919 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 920 /* 921 * notify upper layer that peer has initiated a 922 * shutdown 923 */ 924 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 925 926 /* reset time */ 927 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 928 } 929 } 930 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 931 /* 932 * stop the shutdown timer, since we WILL move to 933 * SHUTDOWN-ACK-SENT. 934 */ 935 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 936 } 937 /* Now is there unsent data on a stream somewhere? */ 938 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 939 940 if (!TAILQ_EMPTY(&asoc->send_queue) || 941 !TAILQ_EMPTY(&asoc->sent_queue) || 942 some_on_streamwheel) { 943 /* By returning we will push more data out */ 944 return; 945 } else { 946 /* no outstanding data to send, so move on... */ 947 /* send SHUTDOWN-ACK */ 948 /* move to SHUTDOWN-ACK-SENT state */ 949 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 950 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 951 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 952 } 953 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 954 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 955 sctp_stop_timers_for_shutdown(stcb); 956 sctp_send_shutdown_ack(stcb, net); 957 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 958 stcb, net); 959 } 960} 961 962static void 963sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 964 struct sctp_tcb *stcb, 965 struct sctp_nets *net) 966{ 967 struct sctp_association *asoc; 968 969#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 970 struct socket *so; 971 972 so = SCTP_INP_SO(stcb->sctp_ep); 973#endif 974 SCTPDBG(SCTP_DEBUG_INPUT2, 975 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 976 if (stcb == NULL) 977 return; 978 979 asoc = &stcb->asoc; 980 /* process according to association state */ 981 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 982 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 983 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 984 sctp_send_shutdown_complete(stcb, net, 1); 985 SCTP_TCB_UNLOCK(stcb); 986 return; 987 } 988 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 989 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 990 /* unexpected SHUTDOWN-ACK... so ignore... */ 991 SCTP_TCB_UNLOCK(stcb); 992 return; 993 } 994 if (asoc->control_pdapi) { 995 /* 996 * With a normal shutdown we assume the end of last record. 997 */ 998 SCTP_INP_READ_LOCK(stcb->sctp_ep); 999 asoc->control_pdapi->end_added = 1; 1000 asoc->control_pdapi->pdapi_aborted = 1; 1001 asoc->control_pdapi = NULL; 1002 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1003#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1004 atomic_add_int(&stcb->asoc.refcnt, 1); 1005 SCTP_TCB_UNLOCK(stcb); 1006 SCTP_SOCKET_LOCK(so, 1); 1007 SCTP_TCB_LOCK(stcb); 1008 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1009 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1010 /* assoc was freed while we were unlocked */ 1011 SCTP_SOCKET_UNLOCK(so, 1); 1012 return; 1013 } 1014#endif 1015 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1016#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1017 SCTP_SOCKET_UNLOCK(so, 1); 1018#endif 1019 } 1020#ifdef INVARIANTS 1021 if (!TAILQ_EMPTY(&asoc->send_queue) || 1022 !TAILQ_EMPTY(&asoc->sent_queue) || 1023 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1024 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1025 } 1026#endif 1027 /* stop the timer */ 1028 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 1029 /* send SHUTDOWN-COMPLETE */ 1030 sctp_send_shutdown_complete(stcb, net, 0); 1031 /* notify upper layer protocol */ 1032 if (stcb->sctp_socket) { 1033 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1034 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1035 stcb->sctp_socket->so_snd.sb_cc = 0; 1036 } 1037 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1038 } 1039 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1040 /* free the TCB but first save off the ep */ 1041#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1042 atomic_add_int(&stcb->asoc.refcnt, 1); 1043 SCTP_TCB_UNLOCK(stcb); 1044 SCTP_SOCKET_LOCK(so, 1); 1045 SCTP_TCB_LOCK(stcb); 1046 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1047#endif 1048 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1049 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1050#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1051 SCTP_SOCKET_UNLOCK(so, 1); 1052#endif 1053} 1054 1055/* 1056 * Skip past the param header and then we will find the chunk that caused the 1057 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1058 * our peer must be broken. 1059 */ 1060static void 1061sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1062 struct sctp_nets *net) 1063{ 1064 struct sctp_chunkhdr *chk; 1065 1066 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1067 switch (chk->chunk_type) { 1068 case SCTP_ASCONF_ACK: 1069 case SCTP_ASCONF: 1070 sctp_asconf_cleanup(stcb, net); 1071 break; 1072 case SCTP_FORWARD_CUM_TSN: 1073 stcb->asoc.prsctp_supported = 0; 1074 break; 1075 default: 1076 SCTPDBG(SCTP_DEBUG_INPUT2, 1077 "Peer does not support chunk type %d(%x)??\n", 1078 chk->chunk_type, (uint32_t) chk->chunk_type); 1079 break; 1080 } 1081} 1082 1083/* 1084 * Skip past the param header and then we will find the param that caused the 1085 * problem. There are a number of param's in a ASCONF OR the prsctp param 1086 * these will turn of specific features. 1087 * XXX: Is this the right thing to do? 1088 */ 1089static void 1090sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1091{ 1092 struct sctp_paramhdr *pbad; 1093 1094 pbad = phdr + 1; 1095 switch (ntohs(pbad->param_type)) { 1096 /* pr-sctp draft */ 1097 case SCTP_PRSCTP_SUPPORTED: 1098 stcb->asoc.prsctp_supported = 0; 1099 break; 1100 case SCTP_SUPPORTED_CHUNK_EXT: 1101 break; 1102 /* draft-ietf-tsvwg-addip-sctp */ 1103 case SCTP_HAS_NAT_SUPPORT: 1104 stcb->asoc.peer_supports_nat = 0; 1105 break; 1106 case SCTP_ADD_IP_ADDRESS: 1107 case SCTP_DEL_IP_ADDRESS: 1108 case SCTP_SET_PRIM_ADDR: 1109 stcb->asoc.asconf_supported = 0; 1110 break; 1111 case SCTP_SUCCESS_REPORT: 1112 case SCTP_ERROR_CAUSE_IND: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1114 SCTPDBG(SCTP_DEBUG_INPUT2, 1115 "Turning off ASCONF to this strange peer\n"); 1116 stcb->asoc.asconf_supported = 0; 1117 break; 1118 default: 1119 SCTPDBG(SCTP_DEBUG_INPUT2, 1120 "Peer does not support param type %d(%x)??\n", 1121 pbad->param_type, (uint32_t) pbad->param_type); 1122 break; 1123 } 1124} 1125 1126static int 1127sctp_handle_error(struct sctp_chunkhdr *ch, 1128 struct sctp_tcb *stcb, struct sctp_nets *net) 1129{ 1130 int chklen; 1131 struct sctp_paramhdr *phdr; 1132 uint16_t error, error_type; 1133 uint16_t error_len; 1134 struct sctp_association *asoc; 1135 int adjust; 1136 1137#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1138 struct socket *so; 1139 1140#endif 1141 1142 /* parse through all of the errors and process */ 1143 asoc = &stcb->asoc; 1144 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1145 sizeof(struct sctp_chunkhdr)); 1146 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1147 error = 0; 1148 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1149 /* Process an Error Cause */ 1150 error_type = ntohs(phdr->param_type); 1151 error_len = ntohs(phdr->param_length); 1152 if ((error_len > chklen) || (error_len == 0)) { 1153 /* invalid param length for this param */ 1154 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1155 chklen, error_len); 1156 return (0); 1157 } 1158 if (error == 0) { 1159 /* report the first error cause */ 1160 error = error_type; 1161 } 1162 switch (error_type) { 1163 case SCTP_CAUSE_INVALID_STREAM: 1164 case SCTP_CAUSE_MISSING_PARAM: 1165 case SCTP_CAUSE_INVALID_PARAM: 1166 case SCTP_CAUSE_NO_USER_DATA: 1167 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1168 error_type); 1169 break; 1170 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1171 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1172 ch->chunk_flags); 1173 if (sctp_handle_nat_colliding_state(stcb)) { 1174 return (0); 1175 } 1176 break; 1177 case SCTP_CAUSE_NAT_MISSING_STATE: 1178 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1179 ch->chunk_flags); 1180 if (sctp_handle_nat_missing_state(stcb, net)) { 1181 return (0); 1182 } 1183 break; 1184 case SCTP_CAUSE_STALE_COOKIE: 1185 /* 1186 * We only act if we have echoed a cookie and are 1187 * waiting. 1188 */ 1189 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1190 int *p; 1191 1192 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1193 /* Save the time doubled */ 1194 asoc->cookie_preserve_req = ntohl(*p) << 1; 1195 asoc->stale_cookie_count++; 1196 if (asoc->stale_cookie_count > 1197 asoc->max_init_times) { 1198 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1199 /* now free the asoc */ 1200#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1201 so = SCTP_INP_SO(stcb->sctp_ep); 1202 atomic_add_int(&stcb->asoc.refcnt, 1); 1203 SCTP_TCB_UNLOCK(stcb); 1204 SCTP_SOCKET_LOCK(so, 1); 1205 SCTP_TCB_LOCK(stcb); 1206 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1207#endif 1208 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1209 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1210#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1211 SCTP_SOCKET_UNLOCK(so, 1); 1212#endif 1213 return (-1); 1214 } 1215 /* blast back to INIT state */ 1216 sctp_toss_old_cookies(stcb, &stcb->asoc); 1217 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1218 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1219 sctp_stop_all_cookie_timers(stcb); 1220 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1221 } 1222 break; 1223 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1224 /* 1225 * Nothing we can do here, we don't do hostname 1226 * addresses so if the peer does not like my IPv6 1227 * (or IPv4 for that matter) it does not matter. If 1228 * they don't support that type of address, they can 1229 * NOT possibly get that packet type... i.e. with no 1230 * IPv6 you can't recieve a IPv6 packet. so we can 1231 * safely ignore this one. If we ever added support 1232 * for HOSTNAME Addresses, then we would need to do 1233 * something here. 1234 */ 1235 break; 1236 case SCTP_CAUSE_UNRECOG_CHUNK: 1237 sctp_process_unrecog_chunk(stcb, phdr, net); 1238 break; 1239 case SCTP_CAUSE_UNRECOG_PARAM: 1240 sctp_process_unrecog_param(stcb, phdr); 1241 break; 1242 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1243 /* 1244 * We ignore this since the timer will drive out a 1245 * new cookie anyway and there timer will drive us 1246 * to send a SHUTDOWN_COMPLETE. We can't send one 1247 * here since we don't have their tag. 1248 */ 1249 break; 1250 case SCTP_CAUSE_DELETING_LAST_ADDR: 1251 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1252 case SCTP_CAUSE_DELETING_SRC_ADDR: 1253 /* 1254 * We should NOT get these here, but in a 1255 * ASCONF-ACK. 1256 */ 1257 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1258 error_type); 1259 break; 1260 case SCTP_CAUSE_OUT_OF_RESC: 1261 /* 1262 * And what, pray tell do we do with the fact that 1263 * the peer is out of resources? Not really sure we 1264 * could do anything but abort. I suspect this 1265 * should have came WITH an abort instead of in a 1266 * OP-ERROR. 1267 */ 1268 break; 1269 default: 1270 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1271 error_type); 1272 break; 1273 } 1274 adjust = SCTP_SIZE32(error_len); 1275 chklen -= adjust; 1276 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1277 } 1278 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1279 return (0); 1280} 1281 1282static int 1283sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1284 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1285 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1286 struct sctp_nets *net, int *abort_no_unlock, 1287 uint8_t mflowtype, uint32_t mflowid, 1288 uint32_t vrf_id) 1289{ 1290 struct sctp_init_ack *init_ack; 1291 struct mbuf *op_err; 1292 1293 SCTPDBG(SCTP_DEBUG_INPUT2, 1294 "sctp_handle_init_ack: handling INIT-ACK\n"); 1295 1296 if (stcb == NULL) { 1297 SCTPDBG(SCTP_DEBUG_INPUT2, 1298 "sctp_handle_init_ack: TCB is null\n"); 1299 return (-1); 1300 } 1301 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1302 /* Invalid length */ 1303 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1304 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1305 src, dst, sh, op_err, 1306 mflowtype, mflowid, 1307 vrf_id, net->port); 1308 *abort_no_unlock = 1; 1309 return (-1); 1310 } 1311 init_ack = &cp->init; 1312 /* validate parameters */ 1313 if (init_ack->initiate_tag == 0) { 1314 /* protocol error... send an abort */ 1315 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1316 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1317 src, dst, sh, op_err, 1318 mflowtype, mflowid, 1319 vrf_id, net->port); 1320 *abort_no_unlock = 1; 1321 return (-1); 1322 } 1323 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1324 /* protocol error... send an abort */ 1325 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1326 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1327 src, dst, sh, op_err, 1328 mflowtype, mflowid, 1329 vrf_id, net->port); 1330 *abort_no_unlock = 1; 1331 return (-1); 1332 } 1333 if (init_ack->num_inbound_streams == 0) { 1334 /* protocol error... send an abort */ 1335 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1336 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1337 src, dst, sh, op_err, 1338 mflowtype, mflowid, 1339 vrf_id, net->port); 1340 *abort_no_unlock = 1; 1341 return (-1); 1342 } 1343 if (init_ack->num_outbound_streams == 0) { 1344 /* protocol error... send an abort */ 1345 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1346 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1347 src, dst, sh, op_err, 1348 mflowtype, mflowid, 1349 vrf_id, net->port); 1350 *abort_no_unlock = 1; 1351 return (-1); 1352 } 1353 /* process according to association state... */ 1354 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1355 case SCTP_STATE_COOKIE_WAIT: 1356 /* this is the expected state for this chunk */ 1357 /* process the INIT-ACK parameters */ 1358 if (stcb->asoc.primary_destination->dest_state & 1359 SCTP_ADDR_UNCONFIRMED) { 1360 /* 1361 * The primary is where we sent the INIT, we can 1362 * always consider it confirmed when the INIT-ACK is 1363 * returned. Do this before we load addresses 1364 * though. 1365 */ 1366 stcb->asoc.primary_destination->dest_state &= 1367 ~SCTP_ADDR_UNCONFIRMED; 1368 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1369 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1370 } 1371 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1372 net, abort_no_unlock, 1373 mflowtype, mflowid, 1374 vrf_id) < 0) { 1375 /* error in parsing parameters */ 1376 return (-1); 1377 } 1378 /* update our state */ 1379 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1380 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1381 1382 /* reset the RTO calc */ 1383 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1384 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1385 stcb->asoc.overall_error_count, 1386 0, 1387 SCTP_FROM_SCTP_INPUT, 1388 __LINE__); 1389 } 1390 stcb->asoc.overall_error_count = 0; 1391 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1392 /* 1393 * collapse the init timer back in case of a exponential 1394 * backoff 1395 */ 1396 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1397 stcb, net); 1398 /* 1399 * the send at the end of the inbound data processing will 1400 * cause the cookie to be sent 1401 */ 1402 break; 1403 case SCTP_STATE_SHUTDOWN_SENT: 1404 /* incorrect state... discard */ 1405 break; 1406 case SCTP_STATE_COOKIE_ECHOED: 1407 /* incorrect state... discard */ 1408 break; 1409 case SCTP_STATE_OPEN: 1410 /* incorrect state... discard */ 1411 break; 1412 case SCTP_STATE_EMPTY: 1413 case SCTP_STATE_INUSE: 1414 default: 1415 /* incorrect state... discard */ 1416 return (-1); 1417 break; 1418 } 1419 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1420 return (0); 1421} 1422 1423static struct sctp_tcb * 1424sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1425 struct sockaddr *src, struct sockaddr *dst, 1426 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1427 struct sctp_inpcb *inp, struct sctp_nets **netp, 1428 struct sockaddr *init_src, int *notification, 1429 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1430 uint8_t mflowtype, uint32_t mflowid, 1431 uint32_t vrf_id, uint16_t port); 1432 1433 1434/* 1435 * handle a state cookie for an existing association m: input packet mbuf 1436 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1437 * "split" mbuf and the cookie signature does not exist offset: offset into 1438 * mbuf to the cookie-echo chunk 1439 */ 1440static struct sctp_tcb * 1441sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1442 struct sockaddr *src, struct sockaddr *dst, 1443 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1444 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1445 struct sockaddr *init_src, int *notification, 1446 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1447 uint8_t mflowtype, uint32_t mflowid, 1448 uint32_t vrf_id, uint16_t port) 1449{ 1450 struct sctp_association *asoc; 1451 struct sctp_init_chunk *init_cp, init_buf; 1452 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1453 struct sctp_nets *net; 1454 struct mbuf *op_err; 1455 int init_offset, initack_offset, i; 1456 int retval; 1457 int spec_flag = 0; 1458 uint32_t how_indx; 1459 1460#if defined(SCTP_DETAILED_STR_STATS) 1461 int j; 1462 1463#endif 1464 1465 net = *netp; 1466 /* I know that the TCB is non-NULL from the caller */ 1467 asoc = &stcb->asoc; 1468 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1469 if (asoc->cookie_how[how_indx] == 0) 1470 break; 1471 } 1472 if (how_indx < sizeof(asoc->cookie_how)) { 1473 asoc->cookie_how[how_indx] = 1; 1474 } 1475 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1476 /* SHUTDOWN came in after sending INIT-ACK */ 1477 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1478 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1479 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1480 mflowtype, mflowid, 1481 vrf_id, net->port); 1482 if (how_indx < sizeof(asoc->cookie_how)) 1483 asoc->cookie_how[how_indx] = 2; 1484 return (NULL); 1485 } 1486 /* 1487 * find and validate the INIT chunk in the cookie (peer's info) the 1488 * INIT should start after the cookie-echo header struct (chunk 1489 * header, state cookie header struct) 1490 */ 1491 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1492 1493 init_cp = (struct sctp_init_chunk *) 1494 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1495 (uint8_t *) & init_buf); 1496 if (init_cp == NULL) { 1497 /* could not pull a INIT chunk in cookie */ 1498 return (NULL); 1499 } 1500 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1501 return (NULL); 1502 } 1503 /* 1504 * find and validate the INIT-ACK chunk in the cookie (my info) the 1505 * INIT-ACK follows the INIT chunk 1506 */ 1507 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1508 initack_cp = (struct sctp_init_ack_chunk *) 1509 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1510 (uint8_t *) & initack_buf); 1511 if (initack_cp == NULL) { 1512 /* could not pull INIT-ACK chunk in cookie */ 1513 return (NULL); 1514 } 1515 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1516 return (NULL); 1517 } 1518 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1519 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1520 /* 1521 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1522 * to get into the OPEN state 1523 */ 1524 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1525 /*- 1526 * Opps, this means that we somehow generated two vtag's 1527 * the same. I.e. we did: 1528 * Us Peer 1529 * <---INIT(tag=a)------ 1530 * ----INIT-ACK(tag=t)--> 1531 * ----INIT(tag=t)------> *1 1532 * <---INIT-ACK(tag=a)--- 1533 * <----CE(tag=t)------------- *2 1534 * 1535 * At point *1 we should be generating a different 1536 * tag t'. Which means we would throw away the CE and send 1537 * ours instead. Basically this is case C (throw away side). 1538 */ 1539 if (how_indx < sizeof(asoc->cookie_how)) 1540 asoc->cookie_how[how_indx] = 17; 1541 return (NULL); 1542 1543 } 1544 switch (SCTP_GET_STATE(asoc)) { 1545 case SCTP_STATE_COOKIE_WAIT: 1546 case SCTP_STATE_COOKIE_ECHOED: 1547 /* 1548 * INIT was sent but got a COOKIE_ECHO with the 1549 * correct tags... just accept it...but we must 1550 * process the init so that we can make sure we have 1551 * the right seq no's. 1552 */ 1553 /* First we must process the INIT !! */ 1554 retval = sctp_process_init(init_cp, stcb); 1555 if (retval < 0) { 1556 if (how_indx < sizeof(asoc->cookie_how)) 1557 asoc->cookie_how[how_indx] = 3; 1558 return (NULL); 1559 } 1560 /* we have already processed the INIT so no problem */ 1561 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1562 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1563 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1564 /* update current state */ 1565 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1566 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1567 else 1568 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1569 1570 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1571 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1572 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1573 stcb->sctp_ep, stcb, asoc->primary_destination); 1574 } 1575 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1576 sctp_stop_all_cookie_timers(stcb); 1577 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1578 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1579 (inp->sctp_socket->so_qlimit == 0) 1580 ) { 1581#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1582 struct socket *so; 1583 1584#endif 1585 /* 1586 * Here is where collision would go if we 1587 * did a connect() and instead got a 1588 * init/init-ack/cookie done before the 1589 * init-ack came back.. 1590 */ 1591 stcb->sctp_ep->sctp_flags |= 1592 SCTP_PCB_FLAGS_CONNECTED; 1593#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1594 so = SCTP_INP_SO(stcb->sctp_ep); 1595 atomic_add_int(&stcb->asoc.refcnt, 1); 1596 SCTP_TCB_UNLOCK(stcb); 1597 SCTP_SOCKET_LOCK(so, 1); 1598 SCTP_TCB_LOCK(stcb); 1599 atomic_add_int(&stcb->asoc.refcnt, -1); 1600 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1601 SCTP_SOCKET_UNLOCK(so, 1); 1602 return (NULL); 1603 } 1604#endif 1605 soisconnected(stcb->sctp_socket); 1606#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1607 SCTP_SOCKET_UNLOCK(so, 1); 1608#endif 1609 } 1610 /* notify upper layer */ 1611 *notification = SCTP_NOTIFY_ASSOC_UP; 1612 /* 1613 * since we did not send a HB make sure we don't 1614 * double things 1615 */ 1616 net->hb_responded = 1; 1617 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1618 &cookie->time_entered, 1619 sctp_align_unsafe_makecopy, 1620 SCTP_RTT_FROM_NON_DATA); 1621 1622 if (stcb->asoc.sctp_autoclose_ticks && 1623 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1624 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1625 inp, stcb, NULL); 1626 } 1627 break; 1628 default: 1629 /* 1630 * we're in the OPEN state (or beyond), so peer must 1631 * have simply lost the COOKIE-ACK 1632 */ 1633 break; 1634 } /* end switch */ 1635 sctp_stop_all_cookie_timers(stcb); 1636 /* 1637 * We ignore the return code here.. not sure if we should 1638 * somehow abort.. but we do have an existing asoc. This 1639 * really should not fail. 1640 */ 1641 if (sctp_load_addresses_from_init(stcb, m, 1642 init_offset + sizeof(struct sctp_init_chunk), 1643 initack_offset, src, dst, init_src)) { 1644 if (how_indx < sizeof(asoc->cookie_how)) 1645 asoc->cookie_how[how_indx] = 4; 1646 return (NULL); 1647 } 1648 /* respond with a COOKIE-ACK */ 1649 sctp_toss_old_cookies(stcb, asoc); 1650 sctp_send_cookie_ack(stcb); 1651 if (how_indx < sizeof(asoc->cookie_how)) 1652 asoc->cookie_how[how_indx] = 5; 1653 return (stcb); 1654 } 1655 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1656 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1657 cookie->tie_tag_my_vtag == 0 && 1658 cookie->tie_tag_peer_vtag == 0) { 1659 /* 1660 * case C in Section 5.2.4 Table 2: XMOO silently discard 1661 */ 1662 if (how_indx < sizeof(asoc->cookie_how)) 1663 asoc->cookie_how[how_indx] = 6; 1664 return (NULL); 1665 } 1666 /* 1667 * If nat support, and the below and stcb is established, send back 1668 * a ABORT(colliding state) if we are established. 1669 */ 1670 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1671 (asoc->peer_supports_nat) && 1672 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1673 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1674 (asoc->peer_vtag == 0)))) { 1675 /* 1676 * Special case - Peer's support nat. We may have two init's 1677 * that we gave out the same tag on since one was not 1678 * established.. i.e. we get INIT from host-1 behind the nat 1679 * and we respond tag-a, we get a INIT from host-2 behind 1680 * the nat and we get tag-a again. Then we bring up host-1 1681 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1682 * Now we have colliding state. We must send an abort here 1683 * with colliding state indication. 1684 */ 1685 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1686 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1687 mflowtype, mflowid, 1688 vrf_id, port); 1689 return (NULL); 1690 } 1691 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1692 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1693 (asoc->peer_vtag == 0))) { 1694 /* 1695 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1696 * should be ok, re-accept peer info 1697 */ 1698 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1699 /* 1700 * Extension of case C. If we hit this, then the 1701 * random number generator returned the same vtag 1702 * when we first sent our INIT-ACK and when we later 1703 * sent our INIT. The side with the seq numbers that 1704 * are different will be the one that normnally 1705 * would have hit case C. This in effect "extends" 1706 * our vtags in this collision case to be 64 bits. 1707 * The same collision could occur aka you get both 1708 * vtag and seq number the same twice in a row.. but 1709 * is much less likely. If it did happen then we 1710 * would proceed through and bring up the assoc.. we 1711 * may end up with the wrong stream setup however.. 1712 * which would be bad.. but there is no way to 1713 * tell.. until we send on a stream that does not 1714 * exist :-) 1715 */ 1716 if (how_indx < sizeof(asoc->cookie_how)) 1717 asoc->cookie_how[how_indx] = 7; 1718 1719 return (NULL); 1720 } 1721 if (how_indx < sizeof(asoc->cookie_how)) 1722 asoc->cookie_how[how_indx] = 8; 1723 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1724 sctp_stop_all_cookie_timers(stcb); 1725 /* 1726 * since we did not send a HB make sure we don't double 1727 * things 1728 */ 1729 net->hb_responded = 1; 1730 if (stcb->asoc.sctp_autoclose_ticks && 1731 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1732 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1733 NULL); 1734 } 1735 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1736 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1737 1738 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1739 /* 1740 * Ok the peer probably discarded our data (if we 1741 * echoed a cookie+data). So anything on the 1742 * sent_queue should be marked for retransmit, we 1743 * may not get something to kick us so it COULD 1744 * still take a timeout to move these.. but it can't 1745 * hurt to mark them. 1746 */ 1747 struct sctp_tmit_chunk *chk; 1748 1749 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1750 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1751 chk->sent = SCTP_DATAGRAM_RESEND; 1752 sctp_flight_size_decrease(chk); 1753 sctp_total_flight_decrease(stcb, chk); 1754 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1755 spec_flag++; 1756 } 1757 } 1758 1759 } 1760 /* process the INIT info (peer's info) */ 1761 retval = sctp_process_init(init_cp, stcb); 1762 if (retval < 0) { 1763 if (how_indx < sizeof(asoc->cookie_how)) 1764 asoc->cookie_how[how_indx] = 9; 1765 return (NULL); 1766 } 1767 if (sctp_load_addresses_from_init(stcb, m, 1768 init_offset + sizeof(struct sctp_init_chunk), 1769 initack_offset, src, dst, init_src)) { 1770 if (how_indx < sizeof(asoc->cookie_how)) 1771 asoc->cookie_how[how_indx] = 10; 1772 return (NULL); 1773 } 1774 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1775 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1776 *notification = SCTP_NOTIFY_ASSOC_UP; 1777 1778 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1779 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1780 (inp->sctp_socket->so_qlimit == 0)) { 1781#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1782 struct socket *so; 1783 1784#endif 1785 stcb->sctp_ep->sctp_flags |= 1786 SCTP_PCB_FLAGS_CONNECTED; 1787#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1788 so = SCTP_INP_SO(stcb->sctp_ep); 1789 atomic_add_int(&stcb->asoc.refcnt, 1); 1790 SCTP_TCB_UNLOCK(stcb); 1791 SCTP_SOCKET_LOCK(so, 1); 1792 SCTP_TCB_LOCK(stcb); 1793 atomic_add_int(&stcb->asoc.refcnt, -1); 1794 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1795 SCTP_SOCKET_UNLOCK(so, 1); 1796 return (NULL); 1797 } 1798#endif 1799 soisconnected(stcb->sctp_socket); 1800#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1801 SCTP_SOCKET_UNLOCK(so, 1); 1802#endif 1803 } 1804 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1805 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1806 else 1807 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1808 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1809 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1810 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1811 } else { 1812 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1813 } 1814 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1815 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1816 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1817 stcb->sctp_ep, stcb, asoc->primary_destination); 1818 } 1819 sctp_stop_all_cookie_timers(stcb); 1820 sctp_toss_old_cookies(stcb, asoc); 1821 sctp_send_cookie_ack(stcb); 1822 if (spec_flag) { 1823 /* 1824 * only if we have retrans set do we do this. What 1825 * this call does is get only the COOKIE-ACK out and 1826 * then when we return the normal call to 1827 * sctp_chunk_output will get the retrans out behind 1828 * this. 1829 */ 1830 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1831 } 1832 if (how_indx < sizeof(asoc->cookie_how)) 1833 asoc->cookie_how[how_indx] = 11; 1834 1835 return (stcb); 1836 } 1837 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1838 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1839 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1840 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1841 cookie->tie_tag_peer_vtag != 0) { 1842 struct sctpasochead *head; 1843 1844#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1845 struct socket *so; 1846 1847#endif 1848 1849 if (asoc->peer_supports_nat) { 1850 /* 1851 * This is a gross gross hack. Just call the 1852 * cookie_new code since we are allowing a duplicate 1853 * association. I hope this works... 1854 */ 1855 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1856 sh, cookie, cookie_len, 1857 inp, netp, init_src, notification, 1858 auth_skipped, auth_offset, auth_len, 1859 mflowtype, mflowid, 1860 vrf_id, port)); 1861 } 1862 /* 1863 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1864 */ 1865 /* temp code */ 1866 if (how_indx < sizeof(asoc->cookie_how)) 1867 asoc->cookie_how[how_indx] = 12; 1868 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1869 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1870 1871 /* notify upper layer */ 1872 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1873 atomic_add_int(&stcb->asoc.refcnt, 1); 1874 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1875 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1876 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1877 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1878 } 1879 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1881 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1882 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1883 } 1884 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1885 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, asoc->primary_destination); 1888 1889 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1890 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1891 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1892 } 1893 asoc->pre_open_streams = 1894 ntohs(initack_cp->init.num_outbound_streams); 1895 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1896 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1897 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1898 1899 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1900 1901 asoc->str_reset_seq_in = asoc->init_seq_number; 1902 1903 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1904 if (asoc->mapping_array) { 1905 memset(asoc->mapping_array, 0, 1906 asoc->mapping_array_size); 1907 } 1908 if (asoc->nr_mapping_array) { 1909 memset(asoc->nr_mapping_array, 0, 1910 asoc->mapping_array_size); 1911 } 1912 SCTP_TCB_UNLOCK(stcb); 1913#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 so = SCTP_INP_SO(stcb->sctp_ep); 1915 SCTP_SOCKET_LOCK(so, 1); 1916#endif 1917 SCTP_INP_INFO_WLOCK(); 1918 SCTP_INP_WLOCK(stcb->sctp_ep); 1919 SCTP_TCB_LOCK(stcb); 1920 atomic_add_int(&stcb->asoc.refcnt, -1); 1921 /* send up all the data */ 1922 SCTP_TCB_SEND_LOCK(stcb); 1923 1924 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1925 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1926 stcb->asoc.strmout[i].chunks_on_queues = 0; 1927#if defined(SCTP_DETAILED_STR_STATS) 1928 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1929 asoc->strmout[i].abandoned_sent[j] = 0; 1930 asoc->strmout[i].abandoned_unsent[j] = 0; 1931 } 1932#else 1933 asoc->strmout[i].abandoned_sent[0] = 0; 1934 asoc->strmout[i].abandoned_unsent[0] = 0; 1935#endif 1936 stcb->asoc.strmout[i].stream_no = i; 1937 stcb->asoc.strmout[i].next_sequence_send = 0; 1938 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1939 } 1940 /* process the INIT-ACK info (my info) */ 1941 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1942 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1943 1944 /* pull from vtag hash */ 1945 LIST_REMOVE(stcb, sctp_asocs); 1946 /* re-insert to new vtag position */ 1947 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1948 SCTP_BASE_INFO(hashasocmark))]; 1949 /* 1950 * put it in the bucket in the vtag hash of assoc's for the 1951 * system 1952 */ 1953 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1954 1955 SCTP_TCB_SEND_UNLOCK(stcb); 1956 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1957 SCTP_INP_INFO_WUNLOCK(); 1958#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1959 SCTP_SOCKET_UNLOCK(so, 1); 1960#endif 1961 asoc->total_flight = 0; 1962 asoc->total_flight_count = 0; 1963 /* process the INIT info (peer's info) */ 1964 retval = sctp_process_init(init_cp, stcb); 1965 if (retval < 0) { 1966 if (how_indx < sizeof(asoc->cookie_how)) 1967 asoc->cookie_how[how_indx] = 13; 1968 1969 return (NULL); 1970 } 1971 /* 1972 * since we did not send a HB make sure we don't double 1973 * things 1974 */ 1975 net->hb_responded = 1; 1976 1977 if (sctp_load_addresses_from_init(stcb, m, 1978 init_offset + sizeof(struct sctp_init_chunk), 1979 initack_offset, src, dst, init_src)) { 1980 if (how_indx < sizeof(asoc->cookie_how)) 1981 asoc->cookie_how[how_indx] = 14; 1982 1983 return (NULL); 1984 } 1985 /* respond with a COOKIE-ACK */ 1986 sctp_stop_all_cookie_timers(stcb); 1987 sctp_toss_old_cookies(stcb, asoc); 1988 sctp_send_cookie_ack(stcb); 1989 if (how_indx < sizeof(asoc->cookie_how)) 1990 asoc->cookie_how[how_indx] = 15; 1991 1992 return (stcb); 1993 } 1994 if (how_indx < sizeof(asoc->cookie_how)) 1995 asoc->cookie_how[how_indx] = 16; 1996 /* all other cases... */ 1997 return (NULL); 1998} 1999 2000 2001/* 2002 * handle a state cookie for a new association m: input packet mbuf chain-- 2003 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2004 * and the cookie signature does not exist offset: offset into mbuf to the 2005 * cookie-echo chunk length: length of the cookie chunk to: where the init 2006 * was from returns a new TCB 2007 */ 2008static struct sctp_tcb * 2009sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2010 struct sockaddr *src, struct sockaddr *dst, 2011 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2012 struct sctp_inpcb *inp, struct sctp_nets **netp, 2013 struct sockaddr *init_src, int *notification, 2014 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2015 uint8_t mflowtype, uint32_t mflowid, 2016 uint32_t vrf_id, uint16_t port) 2017{ 2018 struct sctp_tcb *stcb; 2019 struct sctp_init_chunk *init_cp, init_buf; 2020 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2021 union sctp_sockstore store; 2022 struct sctp_association *asoc; 2023 int init_offset, initack_offset, initack_limit; 2024 int retval; 2025 int error = 0; 2026 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2027 2028#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2029 struct socket *so; 2030 2031 so = SCTP_INP_SO(inp); 2032#endif 2033 2034 /* 2035 * find and validate the INIT chunk in the cookie (peer's info) the 2036 * INIT should start after the cookie-echo header struct (chunk 2037 * header, state cookie header struct) 2038 */ 2039 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2040 init_cp = (struct sctp_init_chunk *) 2041 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2042 (uint8_t *) & init_buf); 2043 if (init_cp == NULL) { 2044 /* could not pull a INIT chunk in cookie */ 2045 SCTPDBG(SCTP_DEBUG_INPUT1, 2046 "process_cookie_new: could not pull INIT chunk hdr\n"); 2047 return (NULL); 2048 } 2049 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2050 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2051 return (NULL); 2052 } 2053 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2054 /* 2055 * find and validate the INIT-ACK chunk in the cookie (my info) the 2056 * INIT-ACK follows the INIT chunk 2057 */ 2058 initack_cp = (struct sctp_init_ack_chunk *) 2059 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2060 (uint8_t *) & initack_buf); 2061 if (initack_cp == NULL) { 2062 /* could not pull INIT-ACK chunk in cookie */ 2063 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2064 return (NULL); 2065 } 2066 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2067 return (NULL); 2068 } 2069 /* 2070 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2071 * "initack_limit" value. This is because the chk_length field 2072 * includes the length of the cookie, but the cookie is omitted when 2073 * the INIT and INIT_ACK are tacked onto the cookie... 2074 */ 2075 initack_limit = offset + cookie_len; 2076 2077 /* 2078 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2079 * and popluate 2080 */ 2081 2082 /* 2083 * Here we do a trick, we set in NULL for the proc/thread argument. 2084 * We do this since in effect we only use the p argument when the 2085 * socket is unbound and we must do an implicit bind. Since we are 2086 * getting a cookie, we cannot be unbound. 2087 */ 2088 stcb = sctp_aloc_assoc(inp, init_src, &error, 2089 ntohl(initack_cp->init.initiate_tag), vrf_id, 2090 (struct thread *)NULL 2091 ); 2092 if (stcb == NULL) { 2093 struct mbuf *op_err; 2094 2095 /* memory problem? */ 2096 SCTPDBG(SCTP_DEBUG_INPUT1, 2097 "process_cookie_new: no room for another TCB!\n"); 2098 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2099 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2100 src, dst, sh, op_err, 2101 mflowtype, mflowid, 2102 vrf_id, port); 2103 return (NULL); 2104 } 2105 /* get the correct sctp_nets */ 2106 if (netp) 2107 *netp = sctp_findnet(stcb, init_src); 2108 2109 asoc = &stcb->asoc; 2110 /* get scope variables out of cookie */ 2111 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2112 asoc->scope.site_scope = cookie->site_scope; 2113 asoc->scope.local_scope = cookie->local_scope; 2114 asoc->scope.loopback_scope = cookie->loopback_scope; 2115 2116 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2117 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2118 struct mbuf *op_err; 2119 2120 /* 2121 * Houston we have a problem. The EP changed while the 2122 * cookie was in flight. Only recourse is to abort the 2123 * association. 2124 */ 2125 atomic_add_int(&stcb->asoc.refcnt, 1); 2126 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2127 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2128 src, dst, sh, op_err, 2129 mflowtype, mflowid, 2130 vrf_id, port); 2131#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2132 SCTP_TCB_UNLOCK(stcb); 2133 SCTP_SOCKET_LOCK(so, 1); 2134 SCTP_TCB_LOCK(stcb); 2135#endif 2136 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2137 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2138#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2139 SCTP_SOCKET_UNLOCK(so, 1); 2140#endif 2141 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2142 return (NULL); 2143 } 2144 /* process the INIT-ACK info (my info) */ 2145 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2146 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2147 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2148 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2149 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2150 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2151 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2152 asoc->str_reset_seq_in = asoc->init_seq_number; 2153 2154 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2155 2156 /* process the INIT info (peer's info) */ 2157 if (netp) 2158 retval = sctp_process_init(init_cp, stcb); 2159 else 2160 retval = 0; 2161 if (retval < 0) { 2162 atomic_add_int(&stcb->asoc.refcnt, 1); 2163#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2164 SCTP_TCB_UNLOCK(stcb); 2165 SCTP_SOCKET_LOCK(so, 1); 2166 SCTP_TCB_LOCK(stcb); 2167#endif 2168 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 2169#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2170 SCTP_SOCKET_UNLOCK(so, 1); 2171#endif 2172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2173 return (NULL); 2174 } 2175 /* load all addresses */ 2176 if (sctp_load_addresses_from_init(stcb, m, 2177 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2178 src, dst, init_src)) { 2179 atomic_add_int(&stcb->asoc.refcnt, 1); 2180#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2181 SCTP_TCB_UNLOCK(stcb); 2182 SCTP_SOCKET_LOCK(so, 1); 2183 SCTP_TCB_LOCK(stcb); 2184#endif 2185 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 2186#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2187 SCTP_SOCKET_UNLOCK(so, 1); 2188#endif 2189 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2190 return (NULL); 2191 } 2192 /* 2193 * verify any preceding AUTH chunk that was skipped 2194 */ 2195 /* pull the local authentication parameters from the cookie/init-ack */ 2196 sctp_auth_get_cookie_params(stcb, m, 2197 initack_offset + sizeof(struct sctp_init_ack_chunk), 2198 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2199 if (auth_skipped) { 2200 struct sctp_auth_chunk *auth; 2201 2202 auth = (struct sctp_auth_chunk *) 2203 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2204 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2205 /* auth HMAC failed, dump the assoc and packet */ 2206 SCTPDBG(SCTP_DEBUG_AUTH1, 2207 "COOKIE-ECHO: AUTH failed\n"); 2208 atomic_add_int(&stcb->asoc.refcnt, 1); 2209#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_TCB_UNLOCK(stcb); 2211 SCTP_SOCKET_LOCK(so, 1); 2212 SCTP_TCB_LOCK(stcb); 2213#endif 2214 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2215#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2216 SCTP_SOCKET_UNLOCK(so, 1); 2217#endif 2218 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2219 return (NULL); 2220 } else { 2221 /* remaining chunks checked... good to go */ 2222 stcb->asoc.authenticated = 1; 2223 } 2224 } 2225 /* update current state */ 2226 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2227 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2228 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2229 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2230 stcb->sctp_ep, stcb, asoc->primary_destination); 2231 } 2232 sctp_stop_all_cookie_timers(stcb); 2233 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2234 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2235 2236 /* 2237 * if we're doing ASCONFs, check to see if we have any new local 2238 * addresses that need to get added to the peer (eg. addresses 2239 * changed while cookie echo in flight). This needs to be done 2240 * after we go to the OPEN state to do the correct asconf 2241 * processing. else, make sure we have the correct addresses in our 2242 * lists 2243 */ 2244 2245 /* warning, we re-use sin, sin6, sa_store here! */ 2246 /* pull in local_address (our "from" address) */ 2247 switch (cookie->laddr_type) { 2248#ifdef INET 2249 case SCTP_IPV4_ADDRESS: 2250 /* source addr is IPv4 */ 2251 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2252 store.sin.sin_family = AF_INET; 2253 store.sin.sin_len = sizeof(struct sockaddr_in); 2254 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2255 break; 2256#endif 2257#ifdef INET6 2258 case SCTP_IPV6_ADDRESS: 2259 /* source addr is IPv6 */ 2260 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2261 store.sin6.sin6_family = AF_INET6; 2262 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2263 store.sin6.sin6_scope_id = cookie->scope_id; 2264 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2265 break; 2266#endif 2267 default: 2268 atomic_add_int(&stcb->asoc.refcnt, 1); 2269#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2270 SCTP_TCB_UNLOCK(stcb); 2271 SCTP_SOCKET_LOCK(so, 1); 2272 SCTP_TCB_LOCK(stcb); 2273#endif 2274 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2275#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2276 SCTP_SOCKET_UNLOCK(so, 1); 2277#endif 2278 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2279 return (NULL); 2280 } 2281 2282 /* set up to notify upper layer */ 2283 *notification = SCTP_NOTIFY_ASSOC_UP; 2284 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2285 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2286 (inp->sctp_socket->so_qlimit == 0)) { 2287 /* 2288 * This is an endpoint that called connect() how it got a 2289 * cookie that is NEW is a bit of a mystery. It must be that 2290 * the INIT was sent, but before it got there.. a complete 2291 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2292 * should have went to the other code.. not here.. oh well.. 2293 * a bit of protection is worth having.. 2294 */ 2295 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2296#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2297 atomic_add_int(&stcb->asoc.refcnt, 1); 2298 SCTP_TCB_UNLOCK(stcb); 2299 SCTP_SOCKET_LOCK(so, 1); 2300 SCTP_TCB_LOCK(stcb); 2301 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2302 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2303 SCTP_SOCKET_UNLOCK(so, 1); 2304 return (NULL); 2305 } 2306#endif 2307 soisconnected(stcb->sctp_socket); 2308#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2309 SCTP_SOCKET_UNLOCK(so, 1); 2310#endif 2311 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2312 (inp->sctp_socket->so_qlimit)) { 2313 /* 2314 * We don't want to do anything with this one. Since it is 2315 * the listening guy. The timer will get started for 2316 * accepted connections in the caller. 2317 */ 2318 ; 2319 } 2320 /* since we did not send a HB make sure we don't double things */ 2321 if ((netp) && (*netp)) 2322 (*netp)->hb_responded = 1; 2323 2324 if (stcb->asoc.sctp_autoclose_ticks && 2325 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2326 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2327 } 2328 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2329 if ((netp) && (*netp)) { 2330 /* calculate the RTT and set the encaps port */ 2331 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2332 &cookie->time_entered, sctp_align_unsafe_makecopy, 2333 SCTP_RTT_FROM_NON_DATA); 2334 (*netp)->port = port; 2335 } 2336 /* respond with a COOKIE-ACK */ 2337 sctp_send_cookie_ack(stcb); 2338 2339 /* 2340 * check the address lists for any ASCONFs that need to be sent 2341 * AFTER the cookie-ack is sent 2342 */ 2343 sctp_check_address_list(stcb, m, 2344 initack_offset + sizeof(struct sctp_init_ack_chunk), 2345 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2346 &store.sa, cookie->local_scope, cookie->site_scope, 2347 cookie->ipv4_scope, cookie->loopback_scope); 2348 2349 2350 return (stcb); 2351} 2352 2353/* 2354 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2355 * we NEED to make sure we are not already using the vtag. If so we 2356 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2357 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2358 SCTP_BASE_INFO(hashasocmark))]; 2359 LIST_FOREACH(stcb, head, sctp_asocs) { 2360 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2361 -- SEND ABORT - TRY AGAIN -- 2362 } 2363 } 2364*/ 2365 2366/* 2367 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2368 * existing (non-NULL) TCB 2369 */ 2370static struct mbuf * 2371sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2372 struct sockaddr *src, struct sockaddr *dst, 2373 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2374 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2375 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2376 struct sctp_tcb **locked_tcb, 2377 uint8_t mflowtype, uint32_t mflowid, 2378 uint32_t vrf_id, uint16_t port) 2379{ 2380 struct sctp_state_cookie *cookie; 2381 struct sctp_tcb *l_stcb = *stcb; 2382 struct sctp_inpcb *l_inp; 2383 struct sockaddr *to; 2384 struct sctp_pcb *ep; 2385 struct mbuf *m_sig; 2386 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2387 uint8_t *sig; 2388 uint8_t cookie_ok = 0; 2389 unsigned int sig_offset, cookie_offset; 2390 unsigned int cookie_len; 2391 struct timeval now; 2392 struct timeval time_expires; 2393 int notification = 0; 2394 struct sctp_nets *netl; 2395 int had_a_existing_tcb = 0; 2396 int send_int_conf = 0; 2397 2398#ifdef INET 2399 struct sockaddr_in sin; 2400 2401#endif 2402#ifdef INET6 2403 struct sockaddr_in6 sin6; 2404 2405#endif 2406 2407 SCTPDBG(SCTP_DEBUG_INPUT2, 2408 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2409 2410 if (inp_p == NULL) { 2411 return (NULL); 2412 } 2413 cookie = &cp->cookie; 2414 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2415 cookie_len = ntohs(cp->ch.chunk_length); 2416 2417 if ((cookie->peerport != sh->src_port) && 2418 (cookie->myport != sh->dest_port) && 2419 (cookie->my_vtag != sh->v_tag)) { 2420 /* 2421 * invalid ports or bad tag. Note that we always leave the 2422 * v_tag in the header in network order and when we stored 2423 * it in the my_vtag slot we also left it in network order. 2424 * This maintains the match even though it may be in the 2425 * opposite byte order of the machine :-> 2426 */ 2427 return (NULL); 2428 } 2429 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2430 sizeof(struct sctp_init_chunk) + 2431 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2432 /* cookie too small */ 2433 return (NULL); 2434 } 2435 /* 2436 * split off the signature into its own mbuf (since it should not be 2437 * calculated in the sctp_hmac_m() call). 2438 */ 2439 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2440 m_sig = m_split(m, sig_offset, M_NOWAIT); 2441 if (m_sig == NULL) { 2442 /* out of memory or ?? */ 2443 return (NULL); 2444 } 2445#ifdef SCTP_MBUF_LOGGING 2446 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2447 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2448 } 2449#endif 2450 2451 /* 2452 * compute the signature/digest for the cookie 2453 */ 2454 ep = &(*inp_p)->sctp_ep; 2455 l_inp = *inp_p; 2456 if (l_stcb) { 2457 SCTP_TCB_UNLOCK(l_stcb); 2458 } 2459 SCTP_INP_RLOCK(l_inp); 2460 if (l_stcb) { 2461 SCTP_TCB_LOCK(l_stcb); 2462 } 2463 /* which cookie is it? */ 2464 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2465 (ep->current_secret_number != ep->last_secret_number)) { 2466 /* it's the old cookie */ 2467 (void)sctp_hmac_m(SCTP_HMAC, 2468 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2469 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2470 } else { 2471 /* it's the current cookie */ 2472 (void)sctp_hmac_m(SCTP_HMAC, 2473 (uint8_t *) ep->secret_key[(int)ep->current_secret_number], 2474 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2475 } 2476 /* get the signature */ 2477 SCTP_INP_RUNLOCK(l_inp); 2478 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2479 if (sig == NULL) { 2480 /* couldn't find signature */ 2481 sctp_m_freem(m_sig); 2482 return (NULL); 2483 } 2484 /* compare the received digest with the computed digest */ 2485 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2486 /* try the old cookie? */ 2487 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2488 (ep->current_secret_number != ep->last_secret_number)) { 2489 /* compute digest with old */ 2490 (void)sctp_hmac_m(SCTP_HMAC, 2491 (uint8_t *) ep->secret_key[(int)ep->last_secret_number], 2492 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2493 /* compare */ 2494 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2495 cookie_ok = 1; 2496 } 2497 } else { 2498 cookie_ok = 1; 2499 } 2500 2501 /* 2502 * Now before we continue we must reconstruct our mbuf so that 2503 * normal processing of any other chunks will work. 2504 */ 2505 { 2506 struct mbuf *m_at; 2507 2508 m_at = m; 2509 while (SCTP_BUF_NEXT(m_at) != NULL) { 2510 m_at = SCTP_BUF_NEXT(m_at); 2511 } 2512 SCTP_BUF_NEXT(m_at) = m_sig; 2513 } 2514 2515 if (cookie_ok == 0) { 2516 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2517 SCTPDBG(SCTP_DEBUG_INPUT2, 2518 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2519 (uint32_t) offset, cookie_offset, sig_offset); 2520 return (NULL); 2521 } 2522 /* 2523 * check the cookie timestamps to be sure it's not stale 2524 */ 2525 (void)SCTP_GETTIME_TIMEVAL(&now); 2526 /* Expire time is in Ticks, so we convert to seconds */ 2527 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2528 time_expires.tv_usec = cookie->time_entered.tv_usec; 2529 /* 2530 * TODO sctp_constants.h needs alternative time macros when _KERNEL 2531 * is undefined. 2532 */ 2533 if (timevalcmp(&now, &time_expires, >)) { 2534 /* cookie is stale! */ 2535 struct mbuf *op_err; 2536 struct sctp_stale_cookie_msg *scm; 2537 uint32_t tim; 2538 2539 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2540 0, M_NOWAIT, 1, MT_DATA); 2541 if (op_err == NULL) { 2542 /* FOOBAR */ 2543 return (NULL); 2544 } 2545 /* Set the len */ 2546 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2547 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2548 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2549 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2550 (sizeof(uint32_t)))); 2551 /* seconds to usec */ 2552 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2553 /* add in usec */ 2554 if (tim == 0) 2555 tim = now.tv_usec - cookie->time_entered.tv_usec; 2556 scm->time_usec = htonl(tim); 2557 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2558 mflowtype, mflowid, 2559 vrf_id, port); 2560 return (NULL); 2561 } 2562 /* 2563 * Now we must see with the lookup address if we have an existing 2564 * asoc. This will only happen if we were in the COOKIE-WAIT state 2565 * and a INIT collided with us and somewhere the peer sent the 2566 * cookie on another address besides the single address our assoc 2567 * had for him. In this case we will have one of the tie-tags set at 2568 * least AND the address field in the cookie can be used to look it 2569 * up. 2570 */ 2571 to = NULL; 2572 switch (cookie->addr_type) { 2573#ifdef INET6 2574 case SCTP_IPV6_ADDRESS: 2575 memset(&sin6, 0, sizeof(sin6)); 2576 sin6.sin6_family = AF_INET6; 2577 sin6.sin6_len = sizeof(sin6); 2578 sin6.sin6_port = sh->src_port; 2579 sin6.sin6_scope_id = cookie->scope_id; 2580 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2581 sizeof(sin6.sin6_addr.s6_addr)); 2582 to = (struct sockaddr *)&sin6; 2583 break; 2584#endif 2585#ifdef INET 2586 case SCTP_IPV4_ADDRESS: 2587 memset(&sin, 0, sizeof(sin)); 2588 sin.sin_family = AF_INET; 2589 sin.sin_len = sizeof(sin); 2590 sin.sin_port = sh->src_port; 2591 sin.sin_addr.s_addr = cookie->address[0]; 2592 to = (struct sockaddr *)&sin; 2593 break; 2594#endif 2595 default: 2596 /* This should not happen */ 2597 return (NULL); 2598 } 2599 if (*stcb == NULL) { 2600 /* Yep, lets check */ 2601 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2602 if (*stcb == NULL) { 2603 /* 2604 * We should have only got back the same inp. If we 2605 * got back a different ep we have a problem. The 2606 * original findep got back l_inp and now 2607 */ 2608 if (l_inp != *inp_p) { 2609 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2610 } 2611 } else { 2612 if (*locked_tcb == NULL) { 2613 /* 2614 * In this case we found the assoc only 2615 * after we locked the create lock. This 2616 * means we are in a colliding case and we 2617 * must make sure that we unlock the tcb if 2618 * its one of the cases where we throw away 2619 * the incoming packets. 2620 */ 2621 *locked_tcb = *stcb; 2622 2623 /* 2624 * We must also increment the inp ref count 2625 * since the ref_count flags was set when we 2626 * did not find the TCB, now we found it 2627 * which reduces the refcount.. we must 2628 * raise it back out to balance it all :-) 2629 */ 2630 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2631 if ((*stcb)->sctp_ep != l_inp) { 2632 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2633 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2634 } 2635 } 2636 } 2637 } 2638 cookie_len -= SCTP_SIGNATURE_SIZE; 2639 if (*stcb == NULL) { 2640 /* this is the "normal" case... get a new TCB */ 2641 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2642 cookie, cookie_len, *inp_p, 2643 netp, to, ¬ification, 2644 auth_skipped, auth_offset, auth_len, 2645 mflowtype, mflowid, 2646 vrf_id, port); 2647 } else { 2648 /* this is abnormal... cookie-echo on existing TCB */ 2649 had_a_existing_tcb = 1; 2650 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2651 src, dst, sh, 2652 cookie, cookie_len, *inp_p, *stcb, netp, to, 2653 ¬ification, auth_skipped, auth_offset, auth_len, 2654 mflowtype, mflowid, 2655 vrf_id, port); 2656 } 2657 2658 if (*stcb == NULL) { 2659 /* still no TCB... must be bad cookie-echo */ 2660 return (NULL); 2661 } 2662 if ((*netp != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 2663 (*netp)->flowtype = mflowtype; 2664 } 2665 /* 2666 * Ok, we built an association so confirm the address we sent the 2667 * INIT-ACK to. 2668 */ 2669 netl = sctp_findnet(*stcb, to); 2670 /* 2671 * This code should in theory NOT run but 2672 */ 2673 if (netl == NULL) { 2674 /* TSNH! Huh, why do I need to add this address here? */ 2675 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2676 return (NULL); 2677 } 2678 netl = sctp_findnet(*stcb, to); 2679 } 2680 if (netl) { 2681 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2682 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2683 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2684 netl); 2685 send_int_conf = 1; 2686 } 2687 } 2688 sctp_start_net_timers(*stcb); 2689 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2690 if (!had_a_existing_tcb || 2691 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2692 /* 2693 * If we have a NEW cookie or the connect never 2694 * reached the connected state during collision we 2695 * must do the TCP accept thing. 2696 */ 2697 struct socket *so, *oso; 2698 struct sctp_inpcb *inp; 2699 2700 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2701 /* 2702 * For a restart we will keep the same 2703 * socket, no need to do anything. I THINK!! 2704 */ 2705 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2706 if (send_int_conf) { 2707 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2708 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2709 } 2710 return (m); 2711 } 2712 oso = (*inp_p)->sctp_socket; 2713 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2714 SCTP_TCB_UNLOCK((*stcb)); 2715 CURVNET_SET(oso->so_vnet); 2716 so = sonewconn(oso, 0 2717 ); 2718 CURVNET_RESTORE(); 2719 SCTP_TCB_LOCK((*stcb)); 2720 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2721 2722 if (so == NULL) { 2723 struct mbuf *op_err; 2724 2725#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2726 struct socket *pcb_so; 2727 2728#endif 2729 /* Too many sockets */ 2730 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2731 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2732 sctp_abort_association(*inp_p, NULL, m, iphlen, 2733 src, dst, sh, op_err, 2734 mflowtype, mflowid, 2735 vrf_id, port); 2736#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2737 pcb_so = SCTP_INP_SO(*inp_p); 2738 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2739 SCTP_TCB_UNLOCK((*stcb)); 2740 SCTP_SOCKET_LOCK(pcb_so, 1); 2741 SCTP_TCB_LOCK((*stcb)); 2742 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2743#endif 2744 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2745#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2746 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2747#endif 2748 return (NULL); 2749 } 2750 inp = (struct sctp_inpcb *)so->so_pcb; 2751 SCTP_INP_INCR_REF(inp); 2752 /* 2753 * We add the unbound flag here so that if we get an 2754 * soabort() before we get the move_pcb done, we 2755 * will properly cleanup. 2756 */ 2757 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2758 SCTP_PCB_FLAGS_CONNECTED | 2759 SCTP_PCB_FLAGS_IN_TCPPOOL | 2760 SCTP_PCB_FLAGS_UNBOUND | 2761 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2762 SCTP_PCB_FLAGS_DONT_WAKE); 2763 inp->sctp_features = (*inp_p)->sctp_features; 2764 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2765 inp->sctp_socket = so; 2766 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2767 inp->max_cwnd = (*inp_p)->max_cwnd; 2768 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2769 inp->ecn_supported = (*inp_p)->ecn_supported; 2770 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2771 inp->auth_supported = (*inp_p)->auth_supported; 2772 inp->asconf_supported = (*inp_p)->asconf_supported; 2773 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2774 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2775 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2776 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2777 inp->sctp_context = (*inp_p)->sctp_context; 2778 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2779 inp->inp_starting_point_for_iterator = NULL; 2780 /* 2781 * copy in the authentication parameters from the 2782 * original endpoint 2783 */ 2784 if (inp->sctp_ep.local_hmacs) 2785 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2786 inp->sctp_ep.local_hmacs = 2787 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2788 if (inp->sctp_ep.local_auth_chunks) 2789 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2790 inp->sctp_ep.local_auth_chunks = 2791 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2792 2793 /* 2794 * Now we must move it from one hash table to 2795 * another and get the tcb in the right place. 2796 */ 2797 2798 /* 2799 * This is where the one-2-one socket is put into 2800 * the accept state waiting for the accept! 2801 */ 2802 if (*stcb) { 2803 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2804 } 2805 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2806 2807 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2808 SCTP_TCB_UNLOCK((*stcb)); 2809 2810 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2811 0); 2812 SCTP_TCB_LOCK((*stcb)); 2813 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2814 2815 2816 /* 2817 * now we must check to see if we were aborted while 2818 * the move was going on and the lock/unlock 2819 * happened. 2820 */ 2821 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2822 /* 2823 * yep it was, we leave the assoc attached 2824 * to the socket since the sctp_inpcb_free() 2825 * call will send an abort for us. 2826 */ 2827 SCTP_INP_DECR_REF(inp); 2828 return (NULL); 2829 } 2830 SCTP_INP_DECR_REF(inp); 2831 /* Switch over to the new guy */ 2832 *inp_p = inp; 2833 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2834 if (send_int_conf) { 2835 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2836 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2837 } 2838 /* 2839 * Pull it from the incomplete queue and wake the 2840 * guy 2841 */ 2842#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2843 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2844 SCTP_TCB_UNLOCK((*stcb)); 2845 SCTP_SOCKET_LOCK(so, 1); 2846#endif 2847 soisconnected(so); 2848#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2849 SCTP_TCB_LOCK((*stcb)); 2850 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2851 SCTP_SOCKET_UNLOCK(so, 1); 2852#endif 2853 return (m); 2854 } 2855 } 2856 if (notification) { 2857 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2858 } 2859 if (send_int_conf) { 2860 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2861 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2862 } 2863 return (m); 2864} 2865 2866static void 2867sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2868 struct sctp_tcb *stcb, struct sctp_nets *net) 2869{ 2870 /* cp must not be used, others call this without a c-ack :-) */ 2871 struct sctp_association *asoc; 2872 2873 SCTPDBG(SCTP_DEBUG_INPUT2, 2874 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2875 if ((stcb == NULL) || (net == NULL)) { 2876 return; 2877 } 2878 asoc = &stcb->asoc; 2879 2880 sctp_stop_all_cookie_timers(stcb); 2881 /* process according to association state */ 2882 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2883 /* state change only needed when I am in right state */ 2884 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2885 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2886 sctp_start_net_timers(stcb); 2887 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2888 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2889 stcb->sctp_ep, stcb, asoc->primary_destination); 2890 2891 } 2892 /* update RTO */ 2893 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2894 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2895 if (asoc->overall_error_count == 0) { 2896 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2897 &asoc->time_entered, sctp_align_safe_nocopy, 2898 SCTP_RTT_FROM_NON_DATA); 2899 } 2900 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2901 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2902 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2903 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2904#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2905 struct socket *so; 2906 2907#endif 2908 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2909#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2910 so = SCTP_INP_SO(stcb->sctp_ep); 2911 atomic_add_int(&stcb->asoc.refcnt, 1); 2912 SCTP_TCB_UNLOCK(stcb); 2913 SCTP_SOCKET_LOCK(so, 1); 2914 SCTP_TCB_LOCK(stcb); 2915 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2916#endif 2917 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2918 soisconnected(stcb->sctp_socket); 2919 } 2920#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2921 SCTP_SOCKET_UNLOCK(so, 1); 2922#endif 2923 } 2924 /* 2925 * since we did not send a HB make sure we don't double 2926 * things 2927 */ 2928 net->hb_responded = 1; 2929 2930 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2931 /* 2932 * We don't need to do the asconf thing, nor hb or 2933 * autoclose if the socket is closed. 2934 */ 2935 goto closed_socket; 2936 } 2937 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2938 stcb, net); 2939 2940 2941 if (stcb->asoc.sctp_autoclose_ticks && 2942 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2943 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2944 stcb->sctp_ep, stcb, NULL); 2945 } 2946 /* 2947 * send ASCONF if parameters are pending and ASCONFs are 2948 * allowed (eg. addresses changed when init/cookie echo were 2949 * in flight) 2950 */ 2951 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2952 (stcb->asoc.asconf_supported == 1) && 2953 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2954#ifdef SCTP_TIMER_BASED_ASCONF 2955 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2956 stcb->sctp_ep, stcb, 2957 stcb->asoc.primary_destination); 2958#else 2959 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2960 SCTP_ADDR_NOT_LOCKED); 2961#endif 2962 } 2963 } 2964closed_socket: 2965 /* Toss the cookie if I can */ 2966 sctp_toss_old_cookies(stcb, asoc); 2967 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 2968 /* Restart the timer if we have pending data */ 2969 struct sctp_tmit_chunk *chk; 2970 2971 chk = TAILQ_FIRST(&asoc->sent_queue); 2972 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2973 } 2974} 2975 2976static void 2977sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2978 struct sctp_tcb *stcb) 2979{ 2980 struct sctp_nets *net; 2981 struct sctp_tmit_chunk *lchk; 2982 struct sctp_ecne_chunk bkup; 2983 uint8_t override_bit; 2984 uint32_t tsn, window_data_tsn; 2985 int len; 2986 unsigned int pkt_cnt; 2987 2988 len = ntohs(cp->ch.chunk_length); 2989 if ((len != sizeof(struct sctp_ecne_chunk)) && 2990 (len != sizeof(struct old_sctp_ecne_chunk))) { 2991 return; 2992 } 2993 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2994 /* Its the old format */ 2995 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2996 bkup.num_pkts_since_cwr = htonl(1); 2997 cp = &bkup; 2998 } 2999 SCTP_STAT_INCR(sctps_recvecne); 3000 tsn = ntohl(cp->tsn); 3001 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3002 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3003 if (lchk == NULL) { 3004 window_data_tsn = stcb->asoc.sending_seq - 1; 3005 } else { 3006 window_data_tsn = lchk->rec.data.TSN_seq; 3007 } 3008 3009 /* Find where it was sent to if possible. */ 3010 net = NULL; 3011 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3012 if (lchk->rec.data.TSN_seq == tsn) { 3013 net = lchk->whoTo; 3014 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3015 break; 3016 } 3017 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3018 break; 3019 } 3020 } 3021 if (net == NULL) { 3022 /* 3023 * What to do. A previous send of a CWR was possibly lost. 3024 * See how old it is, we may have it marked on the actual 3025 * net. 3026 */ 3027 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3028 if (tsn == net->last_cwr_tsn) { 3029 /* Found him, send it off */ 3030 break; 3031 } 3032 } 3033 if (net == NULL) { 3034 /* 3035 * If we reach here, we need to send a special CWR 3036 * that says hey, we did this a long time ago and 3037 * you lost the response. 3038 */ 3039 net = TAILQ_FIRST(&stcb->asoc.nets); 3040 if (net == NULL) { 3041 /* TSNH */ 3042 return; 3043 } 3044 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3045 } else { 3046 override_bit = 0; 3047 } 3048 } else { 3049 override_bit = 0; 3050 } 3051 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3052 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3053 /* 3054 * JRS - Use the congestion control given in the pluggable 3055 * CC module 3056 */ 3057 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3058 /* 3059 * We reduce once every RTT. So we will only lower cwnd at 3060 * the next sending seq i.e. the window_data_tsn 3061 */ 3062 net->cwr_window_tsn = window_data_tsn; 3063 net->ecn_ce_pkt_cnt += pkt_cnt; 3064 net->lost_cnt = pkt_cnt; 3065 net->last_cwr_tsn = tsn; 3066 } else { 3067 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3068 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3069 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3070 /* 3071 * Another loss in the same window update how many 3072 * marks/packets lost we have had. 3073 */ 3074 int cnt = 1; 3075 3076 if (pkt_cnt > net->lost_cnt) { 3077 /* Should be the case */ 3078 cnt = (pkt_cnt - net->lost_cnt); 3079 net->ecn_ce_pkt_cnt += cnt; 3080 } 3081 net->lost_cnt = pkt_cnt; 3082 net->last_cwr_tsn = tsn; 3083 /* 3084 * Most CC functions will ignore this call, since we 3085 * are in-window yet of the initial CE the peer saw. 3086 */ 3087 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3088 } 3089 } 3090 /* 3091 * We always send a CWR this way if our previous one was lost our 3092 * peer will get an update, or if it is not time again to reduce we 3093 * still get the cwr to the peer. Note we set the override when we 3094 * could not find the TSN on the chunk or the destination network. 3095 */ 3096 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3097} 3098 3099static void 3100sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3101{ 3102 /* 3103 * Here we get a CWR from the peer. We must look in the outqueue and 3104 * make sure that we have a covered ECNE in the control chunk part. 3105 * If so remove it. 3106 */ 3107 struct sctp_tmit_chunk *chk; 3108 struct sctp_ecne_chunk *ecne; 3109 int override; 3110 uint32_t cwr_tsn; 3111 3112 cwr_tsn = ntohl(cp->tsn); 3113 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3114 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3115 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3116 continue; 3117 } 3118 if ((override == 0) && (chk->whoTo != net)) { 3119 /* Must be from the right src unless override is set */ 3120 continue; 3121 } 3122 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3123 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3124 /* this covers this ECNE, we can remove it */ 3125 stcb->asoc.ecn_echo_cnt_onq--; 3126 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3127 sctp_next); 3128 sctp_m_freem(chk->data); 3129 chk->data = NULL; 3130 stcb->asoc.ctrl_queue_cnt--; 3131 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3132 if (override == 0) { 3133 break; 3134 } 3135 } 3136 } 3137} 3138 3139static void 3140sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3141 struct sctp_tcb *stcb, struct sctp_nets *net) 3142{ 3143 struct sctp_association *asoc; 3144 3145#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3146 struct socket *so; 3147 3148#endif 3149 3150 SCTPDBG(SCTP_DEBUG_INPUT2, 3151 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3152 if (stcb == NULL) 3153 return; 3154 3155 asoc = &stcb->asoc; 3156 /* process according to association state */ 3157 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3158 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3159 SCTPDBG(SCTP_DEBUG_INPUT2, 3160 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3161 SCTP_TCB_UNLOCK(stcb); 3162 return; 3163 } 3164 /* notify upper layer protocol */ 3165 if (stcb->sctp_socket) { 3166 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3167 } 3168#ifdef INVARIANTS 3169 if (!TAILQ_EMPTY(&asoc->send_queue) || 3170 !TAILQ_EMPTY(&asoc->sent_queue) || 3171 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3172 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3173 } 3174#endif 3175 /* stop the timer */ 3176 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 3177 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3178 /* free the TCB */ 3179 SCTPDBG(SCTP_DEBUG_INPUT2, 3180 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3181#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3182 so = SCTP_INP_SO(stcb->sctp_ep); 3183 atomic_add_int(&stcb->asoc.refcnt, 1); 3184 SCTP_TCB_UNLOCK(stcb); 3185 SCTP_SOCKET_LOCK(so, 1); 3186 SCTP_TCB_LOCK(stcb); 3187 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3188#endif 3189 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 3190#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3191 SCTP_SOCKET_UNLOCK(so, 1); 3192#endif 3193 return; 3194} 3195 3196static int 3197process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3198 struct sctp_nets *net, uint8_t flg) 3199{ 3200 switch (desc->chunk_type) { 3201 case SCTP_DATA: 3202 /* find the tsn to resend (possibly */ 3203 { 3204 uint32_t tsn; 3205 struct sctp_tmit_chunk *tp1; 3206 3207 tsn = ntohl(desc->tsn_ifany); 3208 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3209 if (tp1->rec.data.TSN_seq == tsn) { 3210 /* found it */ 3211 break; 3212 } 3213 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3214 /* not found */ 3215 tp1 = NULL; 3216 break; 3217 } 3218 } 3219 if (tp1 == NULL) { 3220 /* 3221 * Do it the other way , aka without paying 3222 * attention to queue seq order. 3223 */ 3224 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3225 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3226 if (tp1->rec.data.TSN_seq == tsn) { 3227 /* found it */ 3228 break; 3229 } 3230 } 3231 } 3232 if (tp1 == NULL) { 3233 SCTP_STAT_INCR(sctps_pdrptsnnf); 3234 } 3235 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3236 uint8_t *ddp; 3237 3238 if (((flg & SCTP_BADCRC) == 0) && 3239 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3240 return (0); 3241 } 3242 if ((stcb->asoc.peers_rwnd == 0) && 3243 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3244 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3245 return (0); 3246 } 3247 if (stcb->asoc.peers_rwnd == 0 && 3248 (flg & SCTP_FROM_MIDDLE_BOX)) { 3249 SCTP_STAT_INCR(sctps_pdrpdizrw); 3250 return (0); 3251 } 3252 ddp = (uint8_t *) (mtod(tp1->data, caddr_t)+ 3253 sizeof(struct sctp_data_chunk)); 3254 { 3255 unsigned int iii; 3256 3257 for (iii = 0; iii < sizeof(desc->data_bytes); 3258 iii++) { 3259 if (ddp[iii] != desc->data_bytes[iii]) { 3260 SCTP_STAT_INCR(sctps_pdrpbadd); 3261 return (-1); 3262 } 3263 } 3264 } 3265 3266 if (tp1->do_rtt) { 3267 /* 3268 * this guy had a RTO calculation 3269 * pending on it, cancel it 3270 */ 3271 if (tp1->whoTo->rto_needed == 0) { 3272 tp1->whoTo->rto_needed = 1; 3273 } 3274 tp1->do_rtt = 0; 3275 } 3276 SCTP_STAT_INCR(sctps_pdrpmark); 3277 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3278 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3279 /* 3280 * mark it as if we were doing a FR, since 3281 * we will be getting gap ack reports behind 3282 * the info from the router. 3283 */ 3284 tp1->rec.data.doing_fast_retransmit = 1; 3285 /* 3286 * mark the tsn with what sequences can 3287 * cause a new FR. 3288 */ 3289 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3290 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3291 } else { 3292 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3293 } 3294 3295 /* restart the timer */ 3296 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3297 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3298 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3299 stcb, tp1->whoTo); 3300 3301 /* fix counts and things */ 3302 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3303 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3304 tp1->whoTo->flight_size, 3305 tp1->book_size, 3306 (uintptr_t) stcb, 3307 tp1->rec.data.TSN_seq); 3308 } 3309 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3310 sctp_flight_size_decrease(tp1); 3311 sctp_total_flight_decrease(stcb, tp1); 3312 } 3313 tp1->sent = SCTP_DATAGRAM_RESEND; 3314 } { 3315 /* audit code */ 3316 unsigned int audit; 3317 3318 audit = 0; 3319 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3320 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3321 audit++; 3322 } 3323 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3324 sctp_next) { 3325 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3326 audit++; 3327 } 3328 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3329 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3330 audit, stcb->asoc.sent_queue_retran_cnt); 3331#ifndef SCTP_AUDITING_ENABLED 3332 stcb->asoc.sent_queue_retran_cnt = audit; 3333#endif 3334 } 3335 } 3336 } 3337 break; 3338 case SCTP_ASCONF: 3339 { 3340 struct sctp_tmit_chunk *asconf; 3341 3342 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3343 sctp_next) { 3344 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3345 break; 3346 } 3347 } 3348 if (asconf) { 3349 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3350 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3351 asconf->sent = SCTP_DATAGRAM_RESEND; 3352 asconf->snd_count--; 3353 } 3354 } 3355 break; 3356 case SCTP_INITIATION: 3357 /* resend the INIT */ 3358 stcb->asoc.dropped_special_cnt++; 3359 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3360 /* 3361 * If we can get it in, in a few attempts we do 3362 * this, otherwise we let the timer fire. 3363 */ 3364 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3365 stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3366 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3367 } 3368 break; 3369 case SCTP_SELECTIVE_ACK: 3370 case SCTP_NR_SELECTIVE_ACK: 3371 /* resend the sack */ 3372 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3373 break; 3374 case SCTP_HEARTBEAT_REQUEST: 3375 /* resend a demand HB */ 3376 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3377 /* 3378 * Only retransmit if we KNOW we wont destroy the 3379 * tcb 3380 */ 3381 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3382 } 3383 break; 3384 case SCTP_SHUTDOWN: 3385 sctp_send_shutdown(stcb, net); 3386 break; 3387 case SCTP_SHUTDOWN_ACK: 3388 sctp_send_shutdown_ack(stcb, net); 3389 break; 3390 case SCTP_COOKIE_ECHO: 3391 { 3392 struct sctp_tmit_chunk *cookie; 3393 3394 cookie = NULL; 3395 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3396 sctp_next) { 3397 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3398 break; 3399 } 3400 } 3401 if (cookie) { 3402 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3403 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3404 cookie->sent = SCTP_DATAGRAM_RESEND; 3405 sctp_stop_all_cookie_timers(stcb); 3406 } 3407 } 3408 break; 3409 case SCTP_COOKIE_ACK: 3410 sctp_send_cookie_ack(stcb); 3411 break; 3412 case SCTP_ASCONF_ACK: 3413 /* resend last asconf ack */ 3414 sctp_send_asconf_ack(stcb); 3415 break; 3416 case SCTP_FORWARD_CUM_TSN: 3417 send_forward_tsn(stcb, &stcb->asoc); 3418 break; 3419 /* can't do anything with these */ 3420 case SCTP_PACKET_DROPPED: 3421 case SCTP_INITIATION_ACK: /* this should not happen */ 3422 case SCTP_HEARTBEAT_ACK: 3423 case SCTP_ABORT_ASSOCIATION: 3424 case SCTP_OPERATION_ERROR: 3425 case SCTP_SHUTDOWN_COMPLETE: 3426 case SCTP_ECN_ECHO: 3427 case SCTP_ECN_CWR: 3428 default: 3429 break; 3430 } 3431 return (0); 3432} 3433 3434void 3435sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3436{ 3437 uint32_t i; 3438 uint16_t temp; 3439 3440 /* 3441 * We set things to 0xffff since this is the last delivered sequence 3442 * and we will be sending in 0 after the reset. 3443 */ 3444 3445 if (number_entries) { 3446 for (i = 0; i < number_entries; i++) { 3447 temp = ntohs(list[i]); 3448 if (temp >= stcb->asoc.streamincnt) { 3449 continue; 3450 } 3451 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3452 } 3453 } else { 3454 list = NULL; 3455 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3456 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3457 } 3458 } 3459 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3460} 3461 3462static void 3463sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t * list) 3464{ 3465 uint32_t i; 3466 uint16_t temp; 3467 3468 if (number_entries > 0) { 3469 for (i = 0; i < number_entries; i++) { 3470 temp = ntohs(list[i]); 3471 if (temp >= stcb->asoc.streamoutcnt) { 3472 /* no such stream */ 3473 continue; 3474 } 3475 stcb->asoc.strmout[temp].next_sequence_send = 0; 3476 } 3477 } else { 3478 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3479 stcb->asoc.strmout[i].next_sequence_send = 0; 3480 } 3481 } 3482 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3483} 3484 3485 3486struct sctp_stream_reset_request * 3487sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3488{ 3489 struct sctp_association *asoc; 3490 struct sctp_chunkhdr *ch; 3491 struct sctp_stream_reset_request *r; 3492 struct sctp_tmit_chunk *chk; 3493 int len, clen; 3494 3495 asoc = &stcb->asoc; 3496 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3497 asoc->stream_reset_outstanding = 0; 3498 return (NULL); 3499 } 3500 if (stcb->asoc.str_reset == NULL) { 3501 asoc->stream_reset_outstanding = 0; 3502 return (NULL); 3503 } 3504 chk = stcb->asoc.str_reset; 3505 if (chk->data == NULL) { 3506 return (NULL); 3507 } 3508 if (bchk) { 3509 /* he wants a copy of the chk pointer */ 3510 *bchk = chk; 3511 } 3512 clen = chk->send_size; 3513 ch = mtod(chk->data, struct sctp_chunkhdr *); 3514 r = (struct sctp_stream_reset_request *)(ch + 1); 3515 if (ntohl(r->request_seq) == seq) { 3516 /* found it */ 3517 return (r); 3518 } 3519 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3520 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3521 /* move to the next one, there can only be a max of two */ 3522 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3523 if (ntohl(r->request_seq) == seq) { 3524 return (r); 3525 } 3526 } 3527 /* that seq is not here */ 3528 return (NULL); 3529} 3530 3531static void 3532sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3533{ 3534 struct sctp_association *asoc; 3535 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3536 3537 if (stcb->asoc.str_reset == NULL) { 3538 return; 3539 } 3540 asoc = &stcb->asoc; 3541 3542 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3543 TAILQ_REMOVE(&asoc->control_send_queue, 3544 chk, 3545 sctp_next); 3546 if (chk->data) { 3547 sctp_m_freem(chk->data); 3548 chk->data = NULL; 3549 } 3550 asoc->ctrl_queue_cnt--; 3551 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3552 /* sa_ignore NO_NULL_CHK */ 3553 stcb->asoc.str_reset = NULL; 3554} 3555 3556 3557static int 3558sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3559 uint32_t seq, uint32_t action, 3560 struct sctp_stream_reset_response *respin) 3561{ 3562 uint16_t type; 3563 int lparm_len; 3564 struct sctp_association *asoc = &stcb->asoc; 3565 struct sctp_tmit_chunk *chk; 3566 struct sctp_stream_reset_request *req_param; 3567 struct sctp_stream_reset_out_request *req_out_param; 3568 struct sctp_stream_reset_in_request *req_in_param; 3569 uint32_t number_entries; 3570 3571 if (asoc->stream_reset_outstanding == 0) { 3572 /* duplicate */ 3573 return (0); 3574 } 3575 if (seq == stcb->asoc.str_reset_seq_out) { 3576 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3577 if (req_param != NULL) { 3578 stcb->asoc.str_reset_seq_out++; 3579 type = ntohs(req_param->ph.param_type); 3580 lparm_len = ntohs(req_param->ph.param_length); 3581 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3582 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3583 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3584 asoc->stream_reset_out_is_outstanding = 0; 3585 if (asoc->stream_reset_outstanding) 3586 asoc->stream_reset_outstanding--; 3587 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3588 /* do it */ 3589 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3590 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3591 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3592 } else { 3593 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3594 } 3595 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3596 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3597 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3598 if (asoc->stream_reset_outstanding) 3599 asoc->stream_reset_outstanding--; 3600 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3601 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3602 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3603 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3604 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3605 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3606 } 3607 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3608 /* Ok we now may have more streams */ 3609 int num_stream; 3610 3611 num_stream = stcb->asoc.strm_pending_add_size; 3612 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3613 /* TSNH */ 3614 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3615 } 3616 stcb->asoc.strm_pending_add_size = 0; 3617 if (asoc->stream_reset_outstanding) 3618 asoc->stream_reset_outstanding--; 3619 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3620 /* Put the new streams into effect */ 3621 stcb->asoc.streamoutcnt += num_stream; 3622 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3623 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3624 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3625 SCTP_STREAM_CHANGE_DENIED); 3626 } else { 3627 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3628 SCTP_STREAM_CHANGE_FAILED); 3629 } 3630 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3631 if (asoc->stream_reset_outstanding) 3632 asoc->stream_reset_outstanding--; 3633 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3634 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3635 SCTP_STREAM_CHANGE_DENIED); 3636 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3637 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3638 SCTP_STREAM_CHANGE_FAILED); 3639 } 3640 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3641 /** 3642 * a) Adopt the new in tsn. 3643 * b) reset the map 3644 * c) Adopt the new out-tsn 3645 */ 3646 struct sctp_stream_reset_response_tsn *resp; 3647 struct sctp_forward_tsn_chunk fwdtsn; 3648 int abort_flag = 0; 3649 3650 if (respin == NULL) { 3651 /* huh ? */ 3652 return (0); 3653 } 3654 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3655 return (0); 3656 } 3657 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3658 resp = (struct sctp_stream_reset_response_tsn *)respin; 3659 asoc->stream_reset_outstanding--; 3660 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3661 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3662 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3663 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3664 if (abort_flag) { 3665 return (1); 3666 } 3667 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3668 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3669 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3670 } 3671 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3672 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3673 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3674 3675 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3676 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3677 3678 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3679 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3680 3681 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3682 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3683 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3684 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3685 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3686 SCTP_ASSOC_RESET_DENIED); 3687 } else { 3688 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3689 SCTP_ASSOC_RESET_FAILED); 3690 } 3691 } 3692 /* get rid of the request and get the request flags */ 3693 if (asoc->stream_reset_outstanding == 0) { 3694 sctp_clean_up_stream_reset(stcb); 3695 } 3696 } 3697 } 3698 return (0); 3699} 3700 3701static void 3702sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3703 struct sctp_tmit_chunk *chk, 3704 struct sctp_stream_reset_in_request *req, int trunc) 3705{ 3706 uint32_t seq; 3707 int len, i; 3708 int number_entries; 3709 uint16_t temp; 3710 3711 /* 3712 * peer wants me to send a str-reset to him for my outgoing seq's if 3713 * seq_in is right. 3714 */ 3715 struct sctp_association *asoc = &stcb->asoc; 3716 3717 seq = ntohl(req->request_seq); 3718 if (asoc->str_reset_seq_in == seq) { 3719 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3720 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3721 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3722 } else if (trunc) { 3723 /* Can't do it, since they exceeded our buffer size */ 3724 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3725 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3726 len = ntohs(req->ph.param_length); 3727 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3728 for (i = 0; i < number_entries; i++) { 3729 temp = ntohs(req->list_of_streams[i]); 3730 req->list_of_streams[i] = temp; 3731 } 3732 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3733 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3734 asoc->str_reset_seq_out, 3735 seq, (asoc->sending_seq - 1)); 3736 asoc->stream_reset_out_is_outstanding = 1; 3737 asoc->str_reset = chk; 3738 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3739 stcb->asoc.stream_reset_outstanding++; 3740 } else { 3741 /* Can't do it, since we have sent one out */ 3742 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3743 } 3744 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3745 asoc->str_reset_seq_in++; 3746 } else if (asoc->str_reset_seq_in - 1 == seq) { 3747 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3748 } else if (asoc->str_reset_seq_in - 2 == seq) { 3749 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3750 } else { 3751 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3752 } 3753} 3754 3755static int 3756sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3757 struct sctp_tmit_chunk *chk, 3758 struct sctp_stream_reset_tsn_request *req) 3759{ 3760 /* reset all in and out and update the tsn */ 3761 /* 3762 * A) reset my str-seq's on in and out. B) Select a receive next, 3763 * and set cum-ack to it. Also process this selected number as a 3764 * fwd-tsn as well. C) set in the response my next sending seq. 3765 */ 3766 struct sctp_forward_tsn_chunk fwdtsn; 3767 struct sctp_association *asoc = &stcb->asoc; 3768 int abort_flag = 0; 3769 uint32_t seq; 3770 3771 seq = ntohl(req->request_seq); 3772 if (asoc->str_reset_seq_in == seq) { 3773 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3774 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3775 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3776 } else { 3777 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3778 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3779 fwdtsn.ch.chunk_flags = 0; 3780 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3781 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3782 if (abort_flag) { 3783 return (1); 3784 } 3785 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3786 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3787 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3788 } 3789 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3790 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3791 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3792 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3793 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3794 atomic_add_int(&asoc->sending_seq, 1); 3795 /* save off historical data for retrans */ 3796 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3797 asoc->last_sending_seq[0] = asoc->sending_seq; 3798 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3799 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3800 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3801 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3802 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3803 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3804 } 3805 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3806 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3807 asoc->str_reset_seq_in++; 3808 } else if (asoc->str_reset_seq_in - 1 == seq) { 3809 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3810 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3811 } else if (asoc->str_reset_seq_in - 2 == seq) { 3812 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3813 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3814 } else { 3815 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3816 } 3817 return (0); 3818} 3819 3820static void 3821sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3822 struct sctp_tmit_chunk *chk, 3823 struct sctp_stream_reset_out_request *req, int trunc) 3824{ 3825 uint32_t seq, tsn; 3826 int number_entries, len; 3827 struct sctp_association *asoc = &stcb->asoc; 3828 3829 seq = ntohl(req->request_seq); 3830 3831 /* now if its not a duplicate we process it */ 3832 if (asoc->str_reset_seq_in == seq) { 3833 len = ntohs(req->ph.param_length); 3834 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3835 /* 3836 * the sender is resetting, handle the list issue.. we must 3837 * a) verify if we can do the reset, if so no problem b) If 3838 * we can't do the reset we must copy the request. c) queue 3839 * it, and setup the data in processor to trigger it off 3840 * when needed and dequeue all the queued data. 3841 */ 3842 tsn = ntohl(req->send_reset_at_tsn); 3843 3844 /* move the reset action back one */ 3845 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3846 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3847 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3848 } else if (trunc) { 3849 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3850 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3851 /* we can do it now */ 3852 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3853 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3854 } else { 3855 /* 3856 * we must queue it up and thus wait for the TSN's 3857 * to arrive that are at or before tsn 3858 */ 3859 struct sctp_stream_reset_list *liste; 3860 int siz; 3861 3862 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3863 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3864 siz, SCTP_M_STRESET); 3865 if (liste == NULL) { 3866 /* gak out of memory */ 3867 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3868 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3869 return; 3870 } 3871 liste->tsn = tsn; 3872 liste->number_entries = number_entries; 3873 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3874 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3875 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3876 } 3877 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3878 asoc->str_reset_seq_in++; 3879 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3880 /* 3881 * one seq back, just echo back last action since my 3882 * response was lost. 3883 */ 3884 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3885 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3886 /* 3887 * two seq back, just echo back last action since my 3888 * response was lost. 3889 */ 3890 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3891 } else { 3892 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3893 } 3894} 3895 3896static void 3897sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3898 struct sctp_stream_reset_add_strm *str_add) 3899{ 3900 /* 3901 * Peer is requesting to add more streams. If its within our 3902 * max-streams we will allow it. 3903 */ 3904 uint32_t num_stream, i; 3905 uint32_t seq; 3906 struct sctp_association *asoc = &stcb->asoc; 3907 struct sctp_queued_to_read *ctl, *nctl; 3908 3909 /* Get the number. */ 3910 seq = ntohl(str_add->request_seq); 3911 num_stream = ntohs(str_add->number_of_streams); 3912 /* Now what would be the new total? */ 3913 if (asoc->str_reset_seq_in == seq) { 3914 num_stream += stcb->asoc.streamincnt; 3915 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3916 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3917 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3918 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3919 (num_stream > 0xffff)) { 3920 /* We must reject it they ask for to many */ 3921 denied: 3922 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3923 } else { 3924 /* Ok, we can do that :-) */ 3925 struct sctp_stream_in *oldstrm; 3926 3927 /* save off the old */ 3928 oldstrm = stcb->asoc.strmin; 3929 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3930 (num_stream * sizeof(struct sctp_stream_in)), 3931 SCTP_M_STRMI); 3932 if (stcb->asoc.strmin == NULL) { 3933 stcb->asoc.strmin = oldstrm; 3934 goto denied; 3935 } 3936 /* copy off the old data */ 3937 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3938 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3939 stcb->asoc.strmin[i].stream_no = i; 3940 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 3941 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3942 /* now anything on those queues? */ 3943 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 3944 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 3945 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 3946 } 3947 } 3948 /* Init the new streams */ 3949 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3950 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3951 stcb->asoc.strmin[i].stream_no = i; 3952 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3953 stcb->asoc.strmin[i].delivery_started = 0; 3954 } 3955 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3956 /* update the size */ 3957 stcb->asoc.streamincnt = num_stream; 3958 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3959 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3960 } 3961 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3962 asoc->str_reset_seq_in++; 3963 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3964 /* 3965 * one seq back, just echo back last action since my 3966 * response was lost. 3967 */ 3968 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3969 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3970 /* 3971 * two seq back, just echo back last action since my 3972 * response was lost. 3973 */ 3974 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3975 } else { 3976 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3977 3978 } 3979} 3980 3981static void 3982sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3983 struct sctp_stream_reset_add_strm *str_add) 3984{ 3985 /* 3986 * Peer is requesting to add more streams. If its within our 3987 * max-streams we will allow it. 3988 */ 3989 uint16_t num_stream; 3990 uint32_t seq; 3991 struct sctp_association *asoc = &stcb->asoc; 3992 3993 /* Get the number. */ 3994 seq = ntohl(str_add->request_seq); 3995 num_stream = ntohs(str_add->number_of_streams); 3996 /* Now what would be the new total? */ 3997 if (asoc->str_reset_seq_in == seq) { 3998 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3999 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4000 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4001 } else if (stcb->asoc.stream_reset_outstanding) { 4002 /* We must reject it we have something pending */ 4003 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4004 } else { 4005 /* Ok, we can do that :-) */ 4006 int mychk; 4007 4008 mychk = stcb->asoc.streamoutcnt; 4009 mychk += num_stream; 4010 if (mychk < 0x10000) { 4011 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4012 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4013 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4014 } 4015 } else { 4016 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4017 } 4018 } 4019 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4020 asoc->str_reset_seq_in++; 4021 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4022 /* 4023 * one seq back, just echo back last action since my 4024 * response was lost. 4025 */ 4026 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4027 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4028 /* 4029 * two seq back, just echo back last action since my 4030 * response was lost. 4031 */ 4032 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4033 } else { 4034 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4035 } 4036} 4037 4038#ifdef __GNUC__ 4039__attribute__((noinline)) 4040#endif 4041 static int 4042 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4043 struct sctp_chunkhdr *ch_req) 4044{ 4045 uint16_t remaining_length, param_len, ptype; 4046 struct sctp_paramhdr pstore; 4047 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4048 uint32_t seq = 0; 4049 int num_req = 0; 4050 int trunc = 0; 4051 struct sctp_tmit_chunk *chk; 4052 struct sctp_chunkhdr *ch; 4053 struct sctp_paramhdr *ph; 4054 int ret_code = 0; 4055 int num_param = 0; 4056 4057 /* now it may be a reset or a reset-response */ 4058 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4059 4060 /* setup for adding the response */ 4061 sctp_alloc_a_chunk(stcb, chk); 4062 if (chk == NULL) { 4063 return (ret_code); 4064 } 4065 chk->copy_by_ref = 0; 4066 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4067 chk->rec.chunk_id.can_take_data = 0; 4068 chk->flags = 0; 4069 chk->asoc = &stcb->asoc; 4070 chk->no_fr_allowed = 0; 4071 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4072 chk->book_size_scale = 0; 4073 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4074 if (chk->data == NULL) { 4075strres_nochunk: 4076 if (chk->data) { 4077 sctp_m_freem(chk->data); 4078 chk->data = NULL; 4079 } 4080 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4081 return (ret_code); 4082 } 4083 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4084 4085 /* setup chunk parameters */ 4086 chk->sent = SCTP_DATAGRAM_UNSENT; 4087 chk->snd_count = 0; 4088 chk->whoTo = NULL; 4089 4090 ch = mtod(chk->data, struct sctp_chunkhdr *); 4091 ch->chunk_type = SCTP_STREAM_RESET; 4092 ch->chunk_flags = 0; 4093 ch->chunk_length = htons(chk->send_size); 4094 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4095 offset += sizeof(struct sctp_chunkhdr); 4096 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4097 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *) & pstore); 4098 if (ph == NULL) { 4099 /* TSNH */ 4100 break; 4101 } 4102 param_len = ntohs(ph->param_length); 4103 if ((param_len > remaining_length) || 4104 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4105 /* bad parameter length */ 4106 break; 4107 } 4108 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4109 (uint8_t *) & cstore); 4110 if (ph == NULL) { 4111 /* TSNH */ 4112 break; 4113 } 4114 ptype = ntohs(ph->param_type); 4115 num_param++; 4116 if (param_len > sizeof(cstore)) { 4117 trunc = 1; 4118 } else { 4119 trunc = 0; 4120 } 4121 if (num_param > SCTP_MAX_RESET_PARAMS) { 4122 /* hit the max of parameters already sorry.. */ 4123 break; 4124 } 4125 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4126 struct sctp_stream_reset_out_request *req_out; 4127 4128 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4129 break; 4130 } 4131 req_out = (struct sctp_stream_reset_out_request *)ph; 4132 num_req++; 4133 if (stcb->asoc.stream_reset_outstanding) { 4134 seq = ntohl(req_out->response_seq); 4135 if (seq == stcb->asoc.str_reset_seq_out) { 4136 /* implicit ack */ 4137 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4138 } 4139 } 4140 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4141 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4142 struct sctp_stream_reset_add_strm *str_add; 4143 4144 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4145 break; 4146 } 4147 str_add = (struct sctp_stream_reset_add_strm *)ph; 4148 num_req++; 4149 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4150 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4151 struct sctp_stream_reset_add_strm *str_add; 4152 4153 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4154 break; 4155 } 4156 str_add = (struct sctp_stream_reset_add_strm *)ph; 4157 num_req++; 4158 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4159 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4160 struct sctp_stream_reset_in_request *req_in; 4161 4162 num_req++; 4163 req_in = (struct sctp_stream_reset_in_request *)ph; 4164 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4165 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4166 struct sctp_stream_reset_tsn_request *req_tsn; 4167 4168 num_req++; 4169 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4170 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4171 ret_code = 1; 4172 goto strres_nochunk; 4173 } 4174 /* no more */ 4175 break; 4176 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4177 struct sctp_stream_reset_response *resp; 4178 uint32_t result; 4179 4180 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4181 break; 4182 } 4183 resp = (struct sctp_stream_reset_response *)ph; 4184 seq = ntohl(resp->response_seq); 4185 result = ntohl(resp->result); 4186 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4187 ret_code = 1; 4188 goto strres_nochunk; 4189 } 4190 } else { 4191 break; 4192 } 4193 offset += SCTP_SIZE32(param_len); 4194 if (remaining_length >= SCTP_SIZE32(param_len)) { 4195 remaining_length -= SCTP_SIZE32(param_len); 4196 } else { 4197 remaining_length = 0; 4198 } 4199 } 4200 if (num_req == 0) { 4201 /* we have no response free the stuff */ 4202 goto strres_nochunk; 4203 } 4204 /* ok we have a chunk to link in */ 4205 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4206 chk, 4207 sctp_next); 4208 stcb->asoc.ctrl_queue_cnt++; 4209 return (ret_code); 4210} 4211 4212/* 4213 * Handle a router or endpoints report of a packet loss, there are two ways 4214 * to handle this, either we get the whole packet and must disect it 4215 * ourselves (possibly with truncation and or corruption) or it is a summary 4216 * from a middle box that did the disectting for us. 4217 */ 4218static void 4219sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4220 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4221{ 4222 uint32_t bottle_bw, on_queue; 4223 uint16_t trunc_len; 4224 unsigned int chlen; 4225 unsigned int at; 4226 struct sctp_chunk_desc desc; 4227 struct sctp_chunkhdr *ch; 4228 4229 chlen = ntohs(cp->ch.chunk_length); 4230 chlen -= sizeof(struct sctp_pktdrop_chunk); 4231 /* XXX possible chlen underflow */ 4232 if (chlen == 0) { 4233 ch = NULL; 4234 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4235 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4236 } else { 4237 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4238 chlen -= sizeof(struct sctphdr); 4239 /* XXX possible chlen underflow */ 4240 memset(&desc, 0, sizeof(desc)); 4241 } 4242 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4243 if (trunc_len > limit) { 4244 trunc_len = limit; 4245 } 4246 /* now the chunks themselves */ 4247 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4248 desc.chunk_type = ch->chunk_type; 4249 /* get amount we need to move */ 4250 at = ntohs(ch->chunk_length); 4251 if (at < sizeof(struct sctp_chunkhdr)) { 4252 /* corrupt chunk, maybe at the end? */ 4253 SCTP_STAT_INCR(sctps_pdrpcrupt); 4254 break; 4255 } 4256 if (trunc_len == 0) { 4257 /* we are supposed to have all of it */ 4258 if (at > chlen) { 4259 /* corrupt skip it */ 4260 SCTP_STAT_INCR(sctps_pdrpcrupt); 4261 break; 4262 } 4263 } else { 4264 /* is there enough of it left ? */ 4265 if (desc.chunk_type == SCTP_DATA) { 4266 if (chlen < (sizeof(struct sctp_data_chunk) + 4267 sizeof(desc.data_bytes))) { 4268 break; 4269 } 4270 } else { 4271 if (chlen < sizeof(struct sctp_chunkhdr)) { 4272 break; 4273 } 4274 } 4275 } 4276 if (desc.chunk_type == SCTP_DATA) { 4277 /* can we get out the tsn? */ 4278 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4279 SCTP_STAT_INCR(sctps_pdrpmbda); 4280 4281 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4282 /* yep */ 4283 struct sctp_data_chunk *dcp; 4284 uint8_t *ddp; 4285 unsigned int iii; 4286 4287 dcp = (struct sctp_data_chunk *)ch; 4288 ddp = (uint8_t *) (dcp + 1); 4289 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4290 desc.data_bytes[iii] = ddp[iii]; 4291 } 4292 desc.tsn_ifany = dcp->dp.tsn; 4293 } else { 4294 /* nope we are done. */ 4295 SCTP_STAT_INCR(sctps_pdrpnedat); 4296 break; 4297 } 4298 } else { 4299 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4300 SCTP_STAT_INCR(sctps_pdrpmbct); 4301 } 4302 4303 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4304 SCTP_STAT_INCR(sctps_pdrppdbrk); 4305 break; 4306 } 4307 if (SCTP_SIZE32(at) > chlen) { 4308 break; 4309 } 4310 chlen -= SCTP_SIZE32(at); 4311 if (chlen < sizeof(struct sctp_chunkhdr)) { 4312 /* done, none left */ 4313 break; 4314 } 4315 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4316 } 4317 /* Now update any rwnd --- possibly */ 4318 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4319 /* From a peer, we get a rwnd report */ 4320 uint32_t a_rwnd; 4321 4322 SCTP_STAT_INCR(sctps_pdrpfehos); 4323 4324 bottle_bw = ntohl(cp->bottle_bw); 4325 on_queue = ntohl(cp->current_onq); 4326 if (bottle_bw && on_queue) { 4327 /* a rwnd report is in here */ 4328 if (bottle_bw > on_queue) 4329 a_rwnd = bottle_bw - on_queue; 4330 else 4331 a_rwnd = 0; 4332 4333 if (a_rwnd == 0) 4334 stcb->asoc.peers_rwnd = 0; 4335 else { 4336 if (a_rwnd > stcb->asoc.total_flight) { 4337 stcb->asoc.peers_rwnd = 4338 a_rwnd - stcb->asoc.total_flight; 4339 } else { 4340 stcb->asoc.peers_rwnd = 0; 4341 } 4342 if (stcb->asoc.peers_rwnd < 4343 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4344 /* SWS sender side engages */ 4345 stcb->asoc.peers_rwnd = 0; 4346 } 4347 } 4348 } 4349 } else { 4350 SCTP_STAT_INCR(sctps_pdrpfmbox); 4351 } 4352 4353 /* now middle boxes in sat networks get a cwnd bump */ 4354 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4355 (stcb->asoc.sat_t3_loss_recovery == 0) && 4356 (stcb->asoc.sat_network)) { 4357 /* 4358 * This is debateable but for sat networks it makes sense 4359 * Note if a T3 timer has went off, we will prohibit any 4360 * changes to cwnd until we exit the t3 loss recovery. 4361 */ 4362 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4363 net, cp, &bottle_bw, &on_queue); 4364 } 4365} 4366 4367/* 4368 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4369 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4370 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4371 * length of the complete packet outputs: - length: modified to remaining 4372 * length after control processing - netp: modified to new sctp_nets after 4373 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4374 * bad packet,...) otherwise return the tcb for this packet 4375 */ 4376#ifdef __GNUC__ 4377__attribute__((noinline)) 4378#endif 4379 static struct sctp_tcb * 4380 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4381 struct sockaddr *src, struct sockaddr *dst, 4382 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4383 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4384 uint8_t mflowtype, uint32_t mflowid, 4385 uint32_t vrf_id, uint16_t port) 4386{ 4387 struct sctp_association *asoc; 4388 struct mbuf *op_err; 4389 char msg[SCTP_DIAG_INFO_LEN]; 4390 uint32_t vtag_in; 4391 int num_chunks = 0; /* number of control chunks processed */ 4392 uint32_t chk_length; 4393 int ret; 4394 int abort_no_unlock = 0; 4395 int ecne_seen = 0; 4396 4397 /* 4398 * How big should this be, and should it be alloc'd? Lets try the 4399 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4400 * until we get into jumbo grams and such.. 4401 */ 4402 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4403 struct sctp_tcb *locked_tcb = stcb; 4404 int got_auth = 0; 4405 uint32_t auth_offset = 0, auth_len = 0; 4406 int auth_skipped = 0; 4407 int asconf_cnt = 0; 4408 4409#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4410 struct socket *so; 4411 4412#endif 4413 4414 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4415 iphlen, *offset, length, (void *)stcb); 4416 4417 /* validate chunk header length... */ 4418 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4419 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4420 ntohs(ch->chunk_length)); 4421 if (locked_tcb) { 4422 SCTP_TCB_UNLOCK(locked_tcb); 4423 } 4424 return (NULL); 4425 } 4426 /* 4427 * validate the verification tag 4428 */ 4429 vtag_in = ntohl(sh->v_tag); 4430 4431 if (locked_tcb) { 4432 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4433 } 4434 if (ch->chunk_type == SCTP_INITIATION) { 4435 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4436 ntohs(ch->chunk_length), vtag_in); 4437 if (vtag_in != 0) { 4438 /* protocol error- silently discard... */ 4439 SCTP_STAT_INCR(sctps_badvtag); 4440 if (locked_tcb) { 4441 SCTP_TCB_UNLOCK(locked_tcb); 4442 } 4443 return (NULL); 4444 } 4445 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4446 /* 4447 * If there is no stcb, skip the AUTH chunk and process 4448 * later after a stcb is found (to validate the lookup was 4449 * valid. 4450 */ 4451 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4452 (stcb == NULL) && 4453 (inp->auth_supported == 1)) { 4454 /* save this chunk for later processing */ 4455 auth_skipped = 1; 4456 auth_offset = *offset; 4457 auth_len = ntohs(ch->chunk_length); 4458 4459 /* (temporarily) move past this chunk */ 4460 *offset += SCTP_SIZE32(auth_len); 4461 if (*offset >= length) { 4462 /* no more data left in the mbuf chain */ 4463 *offset = length; 4464 if (locked_tcb) { 4465 SCTP_TCB_UNLOCK(locked_tcb); 4466 } 4467 return (NULL); 4468 } 4469 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4470 sizeof(struct sctp_chunkhdr), chunk_buf); 4471 } 4472 if (ch == NULL) { 4473 /* Help */ 4474 *offset = length; 4475 if (locked_tcb) { 4476 SCTP_TCB_UNLOCK(locked_tcb); 4477 } 4478 return (NULL); 4479 } 4480 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4481 goto process_control_chunks; 4482 } 4483 /* 4484 * first check if it's an ASCONF with an unknown src addr we 4485 * need to look inside to find the association 4486 */ 4487 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4488 struct sctp_chunkhdr *asconf_ch = ch; 4489 uint32_t asconf_offset = 0, asconf_len = 0; 4490 4491 /* inp's refcount may be reduced */ 4492 SCTP_INP_INCR_REF(inp); 4493 4494 asconf_offset = *offset; 4495 do { 4496 asconf_len = ntohs(asconf_ch->chunk_length); 4497 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4498 break; 4499 stcb = sctp_findassociation_ep_asconf(m, 4500 *offset, 4501 dst, 4502 sh, &inp, netp, vrf_id); 4503 if (stcb != NULL) 4504 break; 4505 asconf_offset += SCTP_SIZE32(asconf_len); 4506 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4507 sizeof(struct sctp_chunkhdr), chunk_buf); 4508 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4509 if (stcb == NULL) { 4510 /* 4511 * reduce inp's refcount if not reduced in 4512 * sctp_findassociation_ep_asconf(). 4513 */ 4514 SCTP_INP_DECR_REF(inp); 4515 } else { 4516 locked_tcb = stcb; 4517 } 4518 4519 /* now go back and verify any auth chunk to be sure */ 4520 if (auth_skipped && (stcb != NULL)) { 4521 struct sctp_auth_chunk *auth; 4522 4523 auth = (struct sctp_auth_chunk *) 4524 sctp_m_getptr(m, auth_offset, 4525 auth_len, chunk_buf); 4526 got_auth = 1; 4527 auth_skipped = 0; 4528 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4529 auth_offset)) { 4530 /* auth HMAC failed so dump it */ 4531 *offset = length; 4532 if (locked_tcb) { 4533 SCTP_TCB_UNLOCK(locked_tcb); 4534 } 4535 return (NULL); 4536 } else { 4537 /* remaining chunks are HMAC checked */ 4538 stcb->asoc.authenticated = 1; 4539 } 4540 } 4541 } 4542 if (stcb == NULL) { 4543 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4544 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4545 msg); 4546 /* no association, so it's out of the blue... */ 4547 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4548 mflowtype, mflowid, 4549 vrf_id, port); 4550 *offset = length; 4551 if (locked_tcb) { 4552 SCTP_TCB_UNLOCK(locked_tcb); 4553 } 4554 return (NULL); 4555 } 4556 asoc = &stcb->asoc; 4557 /* ABORT and SHUTDOWN can use either v_tag... */ 4558 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4559 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4560 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4561 /* Take the T-bit always into account. */ 4562 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4563 (vtag_in == asoc->my_vtag)) || 4564 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4565 (vtag_in == asoc->peer_vtag))) { 4566 /* this is valid */ 4567 } else { 4568 /* drop this packet... */ 4569 SCTP_STAT_INCR(sctps_badvtag); 4570 if (locked_tcb) { 4571 SCTP_TCB_UNLOCK(locked_tcb); 4572 } 4573 return (NULL); 4574 } 4575 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4576 if (vtag_in != asoc->my_vtag) { 4577 /* 4578 * this could be a stale SHUTDOWN-ACK or the 4579 * peer never got the SHUTDOWN-COMPLETE and 4580 * is still hung; we have started a new asoc 4581 * but it won't complete until the shutdown 4582 * is completed 4583 */ 4584 if (locked_tcb) { 4585 SCTP_TCB_UNLOCK(locked_tcb); 4586 } 4587 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4588 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4589 msg); 4590 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4591 sh, inp, op_err, 4592 mflowtype, mflowid, 4593 vrf_id, port); 4594 return (NULL); 4595 } 4596 } else { 4597 /* for all other chunks, vtag must match */ 4598 if (vtag_in != asoc->my_vtag) { 4599 /* invalid vtag... */ 4600 SCTPDBG(SCTP_DEBUG_INPUT3, 4601 "invalid vtag: %xh, expect %xh\n", 4602 vtag_in, asoc->my_vtag); 4603 SCTP_STAT_INCR(sctps_badvtag); 4604 if (locked_tcb) { 4605 SCTP_TCB_UNLOCK(locked_tcb); 4606 } 4607 *offset = length; 4608 return (NULL); 4609 } 4610 } 4611 } /* end if !SCTP_COOKIE_ECHO */ 4612 /* 4613 * process all control chunks... 4614 */ 4615 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4616 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4617 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4618 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4619 /* implied cookie-ack.. we must have lost the ack */ 4620 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4621 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4622 stcb->asoc.overall_error_count, 4623 0, 4624 SCTP_FROM_SCTP_INPUT, 4625 __LINE__); 4626 } 4627 stcb->asoc.overall_error_count = 0; 4628 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4629 *netp); 4630 } 4631process_control_chunks: 4632 while (IS_SCTP_CONTROL(ch)) { 4633 /* validate chunk length */ 4634 chk_length = ntohs(ch->chunk_length); 4635 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4636 ch->chunk_type, chk_length); 4637 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4638 if (chk_length < sizeof(*ch) || 4639 (*offset + (int)chk_length) > length) { 4640 *offset = length; 4641 if (locked_tcb) { 4642 SCTP_TCB_UNLOCK(locked_tcb); 4643 } 4644 return (NULL); 4645 } 4646 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4647 /* 4648 * INIT-ACK only gets the init ack "header" portion only 4649 * because we don't have to process the peer's COOKIE. All 4650 * others get a complete chunk. 4651 */ 4652 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4653 (ch->chunk_type == SCTP_INITIATION)) { 4654 /* get an init-ack chunk */ 4655 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4656 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4657 if (ch == NULL) { 4658 *offset = length; 4659 if (locked_tcb) { 4660 SCTP_TCB_UNLOCK(locked_tcb); 4661 } 4662 return (NULL); 4663 } 4664 } else { 4665 /* For cookies and all other chunks. */ 4666 if (chk_length > sizeof(chunk_buf)) { 4667 /* 4668 * use just the size of the chunk buffer so 4669 * the front part of our chunks fit in 4670 * contiguous space up to the chunk buffer 4671 * size (508 bytes). For chunks that need to 4672 * get more than that they must use the 4673 * sctp_m_getptr() function or other means 4674 * (e.g. know how to parse mbuf chains). 4675 * Cookies do this already. 4676 */ 4677 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4678 (sizeof(chunk_buf) - 4), 4679 chunk_buf); 4680 if (ch == NULL) { 4681 *offset = length; 4682 if (locked_tcb) { 4683 SCTP_TCB_UNLOCK(locked_tcb); 4684 } 4685 return (NULL); 4686 } 4687 } else { 4688 /* We can fit it all */ 4689 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4690 chk_length, chunk_buf); 4691 if (ch == NULL) { 4692 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4693 *offset = length; 4694 if (locked_tcb) { 4695 SCTP_TCB_UNLOCK(locked_tcb); 4696 } 4697 return (NULL); 4698 } 4699 } 4700 } 4701 num_chunks++; 4702 /* Save off the last place we got a control from */ 4703 if (stcb != NULL) { 4704 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4705 /* 4706 * allow last_control to be NULL if 4707 * ASCONF... ASCONF processing will find the 4708 * right net later 4709 */ 4710 if ((netp != NULL) && (*netp != NULL)) 4711 stcb->asoc.last_control_chunk_from = *netp; 4712 } 4713 } 4714#ifdef SCTP_AUDITING_ENABLED 4715 sctp_audit_log(0xB0, ch->chunk_type); 4716#endif 4717 4718 /* check to see if this chunk required auth, but isn't */ 4719 if ((stcb != NULL) && 4720 (stcb->asoc.auth_supported == 1) && 4721 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4722 !stcb->asoc.authenticated) { 4723 /* "silently" ignore */ 4724 SCTP_STAT_INCR(sctps_recvauthmissing); 4725 goto next_chunk; 4726 } 4727 switch (ch->chunk_type) { 4728 case SCTP_INITIATION: 4729 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4730 /* The INIT chunk must be the only chunk. */ 4731 if ((num_chunks > 1) || 4732 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4733 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4734 "INIT not the only chunk"); 4735 sctp_abort_association(inp, stcb, m, iphlen, 4736 src, dst, sh, op_err, 4737 mflowtype, mflowid, 4738 vrf_id, port); 4739 *offset = length; 4740 return (NULL); 4741 } 4742 /* Honor our resource limit. */ 4743 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4744 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4745 sctp_abort_association(inp, stcb, m, iphlen, 4746 src, dst, sh, op_err, 4747 mflowtype, mflowid, 4748 vrf_id, port); 4749 *offset = length; 4750 return (NULL); 4751 } 4752 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4753 (struct sctp_init_chunk *)ch, inp, 4754 stcb, &abort_no_unlock, 4755 mflowtype, mflowid, 4756 vrf_id, port); 4757 *offset = length; 4758 if ((!abort_no_unlock) && (locked_tcb)) { 4759 SCTP_TCB_UNLOCK(locked_tcb); 4760 } 4761 return (NULL); 4762 break; 4763 case SCTP_PAD_CHUNK: 4764 break; 4765 case SCTP_INITIATION_ACK: 4766 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4767 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4768 /* We are not interested anymore */ 4769 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4770 ; 4771 } else { 4772 if (locked_tcb != stcb) { 4773 /* Very unlikely */ 4774 SCTP_TCB_UNLOCK(locked_tcb); 4775 } 4776 *offset = length; 4777 if (stcb) { 4778#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4779 so = SCTP_INP_SO(inp); 4780 atomic_add_int(&stcb->asoc.refcnt, 1); 4781 SCTP_TCB_UNLOCK(stcb); 4782 SCTP_SOCKET_LOCK(so, 1); 4783 SCTP_TCB_LOCK(stcb); 4784 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4785#endif 4786 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 4787#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4788 SCTP_SOCKET_UNLOCK(so, 1); 4789#endif 4790 } 4791 return (NULL); 4792 } 4793 } 4794 /* The INIT-ACK chunk must be the only chunk. */ 4795 if ((num_chunks > 1) || 4796 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4797 *offset = length; 4798 if (locked_tcb) { 4799 SCTP_TCB_UNLOCK(locked_tcb); 4800 } 4801 return (NULL); 4802 } 4803 if ((netp) && (*netp)) { 4804 ret = sctp_handle_init_ack(m, iphlen, *offset, 4805 src, dst, sh, 4806 (struct sctp_init_ack_chunk *)ch, 4807 stcb, *netp, 4808 &abort_no_unlock, 4809 mflowtype, mflowid, 4810 vrf_id); 4811 } else { 4812 ret = -1; 4813 } 4814 *offset = length; 4815 if (abort_no_unlock) { 4816 return (NULL); 4817 } 4818 /* 4819 * Special case, I must call the output routine to 4820 * get the cookie echoed 4821 */ 4822 if ((stcb != NULL) && (ret == 0)) { 4823 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4824 } 4825 if (locked_tcb) { 4826 SCTP_TCB_UNLOCK(locked_tcb); 4827 } 4828 return (NULL); 4829 break; 4830 case SCTP_SELECTIVE_ACK: 4831 { 4832 struct sctp_sack_chunk *sack; 4833 int abort_now = 0; 4834 uint32_t a_rwnd, cum_ack; 4835 uint16_t num_seg, num_dup; 4836 uint8_t flags; 4837 int offset_seg, offset_dup; 4838 4839 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4840 SCTP_STAT_INCR(sctps_recvsacks); 4841 if (stcb == NULL) { 4842 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4843 break; 4844 } 4845 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4846 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4847 break; 4848 } 4849 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4850 /*- 4851 * If we have sent a shutdown-ack, we will pay no 4852 * attention to a sack sent in to us since 4853 * we don't care anymore. 4854 */ 4855 break; 4856 } 4857 sack = (struct sctp_sack_chunk *)ch; 4858 flags = ch->chunk_flags; 4859 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4860 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4861 num_dup = ntohs(sack->sack.num_dup_tsns); 4862 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4863 if (sizeof(struct sctp_sack_chunk) + 4864 num_seg * sizeof(struct sctp_gap_ack_block) + 4865 num_dup * sizeof(uint32_t) != chk_length) { 4866 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4867 break; 4868 } 4869 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4870 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4871 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4872 cum_ack, num_seg, a_rwnd); 4873 stcb->asoc.seen_a_sack_this_pkt = 1; 4874 if ((stcb->asoc.pr_sctp_cnt == 0) && 4875 (num_seg == 0) && 4876 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4877 (stcb->asoc.saw_sack_with_frags == 0) && 4878 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4879 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4880 ) { 4881 /* 4882 * We have a SIMPLE sack having no 4883 * prior segments and data on sent 4884 * queue to be acked.. Use the 4885 * faster path sack processing. We 4886 * also allow window update sacks 4887 * with no missing segments to go 4888 * this way too. 4889 */ 4890 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 4891 } else { 4892 if (netp && *netp) 4893 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4894 num_seg, 0, num_dup, &abort_now, flags, 4895 cum_ack, a_rwnd, ecne_seen); 4896 } 4897 if (abort_now) { 4898 /* ABORT signal from sack processing */ 4899 *offset = length; 4900 return (NULL); 4901 } 4902 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4903 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4904 (stcb->asoc.stream_queue_cnt == 0)) { 4905 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4906 } 4907 } 4908 break; 4909 /* 4910 * EY - nr_sack: If the received chunk is an 4911 * nr_sack chunk 4912 */ 4913 case SCTP_NR_SELECTIVE_ACK: 4914 { 4915 struct sctp_nr_sack_chunk *nr_sack; 4916 int abort_now = 0; 4917 uint32_t a_rwnd, cum_ack; 4918 uint16_t num_seg, num_nr_seg, num_dup; 4919 uint8_t flags; 4920 int offset_seg, offset_dup; 4921 4922 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 4923 SCTP_STAT_INCR(sctps_recvsacks); 4924 if (stcb == NULL) { 4925 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 4926 break; 4927 } 4928 if (stcb->asoc.nrsack_supported == 0) { 4929 goto unknown_chunk; 4930 } 4931 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4932 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 4933 break; 4934 } 4935 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4936 /*- 4937 * If we have sent a shutdown-ack, we will pay no 4938 * attention to a sack sent in to us since 4939 * we don't care anymore. 4940 */ 4941 break; 4942 } 4943 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4944 flags = ch->chunk_flags; 4945 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4946 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4947 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4948 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4949 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 4950 if (sizeof(struct sctp_nr_sack_chunk) + 4951 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4952 num_dup * sizeof(uint32_t) != chk_length) { 4953 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4954 break; 4955 } 4956 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4957 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4958 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4959 cum_ack, num_seg, a_rwnd); 4960 stcb->asoc.seen_a_sack_this_pkt = 1; 4961 if ((stcb->asoc.pr_sctp_cnt == 0) && 4962 (num_seg == 0) && (num_nr_seg == 0) && 4963 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4964 (stcb->asoc.saw_sack_with_frags == 0) && 4965 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4966 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4967 /* 4968 * We have a SIMPLE sack having no 4969 * prior segments and data on sent 4970 * queue to be acked. Use the faster 4971 * path sack processing. We also 4972 * allow window update sacks with no 4973 * missing segments to go this way 4974 * too. 4975 */ 4976 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4977 &abort_now, ecne_seen); 4978 } else { 4979 if (netp && *netp) 4980 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4981 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4982 cum_ack, a_rwnd, ecne_seen); 4983 } 4984 if (abort_now) { 4985 /* ABORT signal from sack processing */ 4986 *offset = length; 4987 return (NULL); 4988 } 4989 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4990 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4991 (stcb->asoc.stream_queue_cnt == 0)) { 4992 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4993 } 4994 } 4995 break; 4996 4997 case SCTP_HEARTBEAT_REQUEST: 4998 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4999 if ((stcb) && netp && *netp) { 5000 SCTP_STAT_INCR(sctps_recvheartbeat); 5001 sctp_send_heartbeat_ack(stcb, m, *offset, 5002 chk_length, *netp); 5003 5004 /* He's alive so give him credit */ 5005 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5006 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5007 stcb->asoc.overall_error_count, 5008 0, 5009 SCTP_FROM_SCTP_INPUT, 5010 __LINE__); 5011 } 5012 stcb->asoc.overall_error_count = 0; 5013 } 5014 break; 5015 case SCTP_HEARTBEAT_ACK: 5016 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5017 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5018 /* Its not ours */ 5019 *offset = length; 5020 if (locked_tcb) { 5021 SCTP_TCB_UNLOCK(locked_tcb); 5022 } 5023 return (NULL); 5024 } 5025 /* He's alive so give him credit */ 5026 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5027 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5028 stcb->asoc.overall_error_count, 5029 0, 5030 SCTP_FROM_SCTP_INPUT, 5031 __LINE__); 5032 } 5033 stcb->asoc.overall_error_count = 0; 5034 SCTP_STAT_INCR(sctps_recvheartbeatack); 5035 if (netp && *netp) 5036 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5037 stcb, *netp); 5038 break; 5039 case SCTP_ABORT_ASSOCIATION: 5040 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5041 (void *)stcb); 5042 if ((stcb) && netp && *netp) 5043 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5044 stcb, *netp); 5045 *offset = length; 5046 return (NULL); 5047 break; 5048 case SCTP_SHUTDOWN: 5049 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5050 (void *)stcb); 5051 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5052 *offset = length; 5053 if (locked_tcb) { 5054 SCTP_TCB_UNLOCK(locked_tcb); 5055 } 5056 return (NULL); 5057 } 5058 if (netp && *netp) { 5059 int abort_flag = 0; 5060 5061 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5062 stcb, *netp, &abort_flag); 5063 if (abort_flag) { 5064 *offset = length; 5065 return (NULL); 5066 } 5067 } 5068 break; 5069 case SCTP_SHUTDOWN_ACK: 5070 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5071 if ((stcb) && (netp) && (*netp)) 5072 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5073 *offset = length; 5074 return (NULL); 5075 break; 5076 5077 case SCTP_OPERATION_ERROR: 5078 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5079 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5080 *offset = length; 5081 return (NULL); 5082 } 5083 break; 5084 case SCTP_COOKIE_ECHO: 5085 SCTPDBG(SCTP_DEBUG_INPUT3, 5086 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5087 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5088 ; 5089 } else { 5090 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5091 /* We are not interested anymore */ 5092 abend: 5093 if (stcb) { 5094 SCTP_TCB_UNLOCK(stcb); 5095 } 5096 *offset = length; 5097 return (NULL); 5098 } 5099 } 5100 /* 5101 * First are we accepting? We do this again here 5102 * since it is possible that a previous endpoint WAS 5103 * listening responded to a INIT-ACK and then 5104 * closed. We opened and bound.. and are now no 5105 * longer listening. 5106 */ 5107 5108 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5109 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5110 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5111 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5112 sctp_abort_association(inp, stcb, m, iphlen, 5113 src, dst, sh, op_err, 5114 mflowtype, mflowid, 5115 vrf_id, port); 5116 } 5117 *offset = length; 5118 return (NULL); 5119 } else { 5120 struct mbuf *ret_buf; 5121 struct sctp_inpcb *linp; 5122 5123 if (stcb) { 5124 linp = NULL; 5125 } else { 5126 linp = inp; 5127 } 5128 5129 if (linp) { 5130 SCTP_ASOC_CREATE_LOCK(linp); 5131 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5132 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5133 SCTP_ASOC_CREATE_UNLOCK(linp); 5134 goto abend; 5135 } 5136 } 5137 if (netp) { 5138 ret_buf = 5139 sctp_handle_cookie_echo(m, iphlen, 5140 *offset, 5141 src, dst, 5142 sh, 5143 (struct sctp_cookie_echo_chunk *)ch, 5144 &inp, &stcb, netp, 5145 auth_skipped, 5146 auth_offset, 5147 auth_len, 5148 &locked_tcb, 5149 mflowtype, 5150 mflowid, 5151 vrf_id, 5152 port); 5153 } else { 5154 ret_buf = NULL; 5155 } 5156 if (linp) { 5157 SCTP_ASOC_CREATE_UNLOCK(linp); 5158 } 5159 if (ret_buf == NULL) { 5160 if (locked_tcb) { 5161 SCTP_TCB_UNLOCK(locked_tcb); 5162 } 5163 SCTPDBG(SCTP_DEBUG_INPUT3, 5164 "GAK, null buffer\n"); 5165 *offset = length; 5166 return (NULL); 5167 } 5168 /* if AUTH skipped, see if it verified... */ 5169 if (auth_skipped) { 5170 got_auth = 1; 5171 auth_skipped = 0; 5172 } 5173 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5174 /* 5175 * Restart the timer if we have 5176 * pending data 5177 */ 5178 struct sctp_tmit_chunk *chk; 5179 5180 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5181 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5182 } 5183 } 5184 break; 5185 case SCTP_COOKIE_ACK: 5186 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5187 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5188 if (locked_tcb) { 5189 SCTP_TCB_UNLOCK(locked_tcb); 5190 } 5191 return (NULL); 5192 } 5193 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5194 /* We are not interested anymore */ 5195 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5196 ; 5197 } else if (stcb) { 5198#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5199 so = SCTP_INP_SO(inp); 5200 atomic_add_int(&stcb->asoc.refcnt, 1); 5201 SCTP_TCB_UNLOCK(stcb); 5202 SCTP_SOCKET_LOCK(so, 1); 5203 SCTP_TCB_LOCK(stcb); 5204 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5205#endif 5206 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 5207#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5208 SCTP_SOCKET_UNLOCK(so, 1); 5209#endif 5210 *offset = length; 5211 return (NULL); 5212 } 5213 } 5214 /* He's alive so give him credit */ 5215 if ((stcb) && netp && *netp) { 5216 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5217 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5218 stcb->asoc.overall_error_count, 5219 0, 5220 SCTP_FROM_SCTP_INPUT, 5221 __LINE__); 5222 } 5223 stcb->asoc.overall_error_count = 0; 5224 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5225 } 5226 break; 5227 case SCTP_ECN_ECHO: 5228 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5229 /* He's alive so give him credit */ 5230 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5231 /* Its not ours */ 5232 if (locked_tcb) { 5233 SCTP_TCB_UNLOCK(locked_tcb); 5234 } 5235 *offset = length; 5236 return (NULL); 5237 } 5238 if (stcb) { 5239 if (stcb->asoc.ecn_supported == 0) { 5240 goto unknown_chunk; 5241 } 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_ecn_echo((struct sctp_ecne_chunk *)ch, 5251 stcb); 5252 ecne_seen = 1; 5253 } 5254 break; 5255 case SCTP_ECN_CWR: 5256 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5257 /* He's alive so give him credit */ 5258 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5259 /* Its not ours */ 5260 if (locked_tcb) { 5261 SCTP_TCB_UNLOCK(locked_tcb); 5262 } 5263 *offset = length; 5264 return (NULL); 5265 } 5266 if (stcb) { 5267 if (stcb->asoc.ecn_supported == 0) { 5268 goto unknown_chunk; 5269 } 5270 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5271 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5272 stcb->asoc.overall_error_count, 5273 0, 5274 SCTP_FROM_SCTP_INPUT, 5275 __LINE__); 5276 } 5277 stcb->asoc.overall_error_count = 0; 5278 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5279 } 5280 break; 5281 case SCTP_SHUTDOWN_COMPLETE: 5282 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5283 /* must be first and only chunk */ 5284 if ((num_chunks > 1) || 5285 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5286 *offset = length; 5287 if (locked_tcb) { 5288 SCTP_TCB_UNLOCK(locked_tcb); 5289 } 5290 return (NULL); 5291 } 5292 if ((stcb) && netp && *netp) { 5293 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5294 stcb, *netp); 5295 } 5296 *offset = length; 5297 return (NULL); 5298 break; 5299 case SCTP_ASCONF: 5300 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5301 /* He's alive so give him credit */ 5302 if (stcb) { 5303 if (stcb->asoc.asconf_supported == 0) { 5304 goto unknown_chunk; 5305 } 5306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5307 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5308 stcb->asoc.overall_error_count, 5309 0, 5310 SCTP_FROM_SCTP_INPUT, 5311 __LINE__); 5312 } 5313 stcb->asoc.overall_error_count = 0; 5314 sctp_handle_asconf(m, *offset, src, 5315 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5316 asconf_cnt++; 5317 } 5318 break; 5319 case SCTP_ASCONF_ACK: 5320 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5321 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5322 /* Its not ours */ 5323 if (locked_tcb) { 5324 SCTP_TCB_UNLOCK(locked_tcb); 5325 } 5326 *offset = length; 5327 return (NULL); 5328 } 5329 if ((stcb) && netp && *netp) { 5330 if (stcb->asoc.asconf_supported == 0) { 5331 goto unknown_chunk; 5332 } 5333 /* He's alive so give him credit */ 5334 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5335 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5336 stcb->asoc.overall_error_count, 5337 0, 5338 SCTP_FROM_SCTP_INPUT, 5339 __LINE__); 5340 } 5341 stcb->asoc.overall_error_count = 0; 5342 sctp_handle_asconf_ack(m, *offset, 5343 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5344 if (abort_no_unlock) 5345 return (NULL); 5346 } 5347 break; 5348 case SCTP_FORWARD_CUM_TSN: 5349 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5350 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5351 /* Its not ours */ 5352 if (locked_tcb) { 5353 SCTP_TCB_UNLOCK(locked_tcb); 5354 } 5355 *offset = length; 5356 return (NULL); 5357 } 5358 /* He's alive so give him credit */ 5359 if (stcb) { 5360 int abort_flag = 0; 5361 5362 if (stcb->asoc.prsctp_supported == 0) { 5363 goto unknown_chunk; 5364 } 5365 stcb->asoc.overall_error_count = 0; 5366 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5367 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5368 stcb->asoc.overall_error_count, 5369 0, 5370 SCTP_FROM_SCTP_INPUT, 5371 __LINE__); 5372 } 5373 *fwd_tsn_seen = 1; 5374 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5375 /* We are not interested anymore */ 5376#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5377 so = SCTP_INP_SO(inp); 5378 atomic_add_int(&stcb->asoc.refcnt, 1); 5379 SCTP_TCB_UNLOCK(stcb); 5380 SCTP_SOCKET_LOCK(so, 1); 5381 SCTP_TCB_LOCK(stcb); 5382 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5383#endif 5384 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 5385#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5386 SCTP_SOCKET_UNLOCK(so, 1); 5387#endif 5388 *offset = length; 5389 return (NULL); 5390 } 5391 sctp_handle_forward_tsn(stcb, 5392 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5393 if (abort_flag) { 5394 *offset = length; 5395 return (NULL); 5396 } else { 5397 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5398 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5399 stcb->asoc.overall_error_count, 5400 0, 5401 SCTP_FROM_SCTP_INPUT, 5402 __LINE__); 5403 } 5404 stcb->asoc.overall_error_count = 0; 5405 } 5406 5407 } 5408 break; 5409 case SCTP_STREAM_RESET: 5410 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5411 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5412 /* Its not ours */ 5413 if (locked_tcb) { 5414 SCTP_TCB_UNLOCK(locked_tcb); 5415 } 5416 *offset = length; 5417 return (NULL); 5418 } 5419 if (stcb->asoc.reconfig_supported == 0) { 5420 goto unknown_chunk; 5421 } 5422 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5423 /* stop processing */ 5424 *offset = length; 5425 return (NULL); 5426 } 5427 break; 5428 case SCTP_PACKET_DROPPED: 5429 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5430 /* re-get it all please */ 5431 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5432 /* Its not ours */ 5433 if (locked_tcb) { 5434 SCTP_TCB_UNLOCK(locked_tcb); 5435 } 5436 *offset = length; 5437 return (NULL); 5438 } 5439 if (ch && (stcb) && netp && (*netp)) { 5440 if (stcb->asoc.pktdrop_supported == 0) { 5441 goto unknown_chunk; 5442 } 5443 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5444 stcb, *netp, 5445 min(chk_length, (sizeof(chunk_buf) - 4))); 5446 5447 } 5448 break; 5449 case SCTP_AUTHENTICATION: 5450 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5451 if (stcb == NULL) { 5452 /* save the first AUTH for later processing */ 5453 if (auth_skipped == 0) { 5454 auth_offset = *offset; 5455 auth_len = chk_length; 5456 auth_skipped = 1; 5457 } 5458 /* skip this chunk (temporarily) */ 5459 goto next_chunk; 5460 } 5461 if (stcb->asoc.auth_supported == 0) { 5462 goto unknown_chunk; 5463 } 5464 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5465 (chk_length > (sizeof(struct sctp_auth_chunk) + 5466 SCTP_AUTH_DIGEST_LEN_MAX))) { 5467 /* Its not ours */ 5468 if (locked_tcb) { 5469 SCTP_TCB_UNLOCK(locked_tcb); 5470 } 5471 *offset = length; 5472 return (NULL); 5473 } 5474 if (got_auth == 1) { 5475 /* skip this chunk... it's already auth'd */ 5476 goto next_chunk; 5477 } 5478 got_auth = 1; 5479 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5480 m, *offset)) { 5481 /* auth HMAC failed so dump the packet */ 5482 *offset = length; 5483 return (stcb); 5484 } else { 5485 /* remaining chunks are HMAC checked */ 5486 stcb->asoc.authenticated = 1; 5487 } 5488 break; 5489 5490 default: 5491 unknown_chunk: 5492 /* it's an unknown chunk! */ 5493 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5494 struct mbuf *mm; 5495 struct sctp_paramhdr *phd; 5496 int len; 5497 5498 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5499 0, M_NOWAIT, 1, MT_DATA); 5500 if (mm) { 5501 len = min(SCTP_SIZE32(chk_length), (uint32_t) (length - *offset)); 5502 phd = mtod(mm, struct sctp_paramhdr *); 5503 /* 5504 * We cheat and use param type since 5505 * we did not bother to define a 5506 * error cause struct. They are the 5507 * same basic format with different 5508 * names. 5509 */ 5510 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5511 phd->param_length = htons(len + sizeof(*phd)); 5512 SCTP_BUF_LEN(mm) = sizeof(*phd); 5513 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5514 if (SCTP_BUF_NEXT(mm)) { 5515 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(len) - len, NULL) == NULL) { 5516 sctp_m_freem(mm); 5517 } else { 5518#ifdef SCTP_MBUF_LOGGING 5519 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5520 sctp_log_mbc(SCTP_BUF_NEXT(mm), SCTP_MBUF_ICOPY); 5521 } 5522#endif 5523 sctp_queue_op_err(stcb, mm); 5524 } 5525 } else { 5526 sctp_m_freem(mm); 5527 } 5528 } 5529 } 5530 if ((ch->chunk_type & 0x80) == 0) { 5531 /* discard this packet */ 5532 *offset = length; 5533 return (stcb); 5534 } /* else skip this bad chunk and continue... */ 5535 break; 5536 } /* switch (ch->chunk_type) */ 5537 5538 5539next_chunk: 5540 /* get the next chunk */ 5541 *offset += SCTP_SIZE32(chk_length); 5542 if (*offset >= length) { 5543 /* no more data left in the mbuf chain */ 5544 break; 5545 } 5546 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5547 sizeof(struct sctp_chunkhdr), chunk_buf); 5548 if (ch == NULL) { 5549 if (locked_tcb) { 5550 SCTP_TCB_UNLOCK(locked_tcb); 5551 } 5552 *offset = length; 5553 return (NULL); 5554 } 5555 } /* while */ 5556 5557 if (asconf_cnt > 0 && stcb != NULL) { 5558 sctp_send_asconf_ack(stcb); 5559 } 5560 return (stcb); 5561} 5562 5563 5564#ifdef INVARIANTS 5565#ifdef __GNUC__ 5566__attribute__((noinline)) 5567#endif 5568 void 5569 sctp_validate_no_locks(struct sctp_inpcb *inp) 5570{ 5571 struct sctp_tcb *lstcb; 5572 5573 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5574 if (mtx_owned(&lstcb->tcb_mtx)) { 5575 panic("Own lock on stcb at return from input"); 5576 } 5577 } 5578 if (mtx_owned(&inp->inp_create_mtx)) { 5579 panic("Own create lock on inp"); 5580 } 5581 if (mtx_owned(&inp->inp_mtx)) { 5582 panic("Own inp lock on inp"); 5583 } 5584} 5585 5586#endif 5587 5588/* 5589 * common input chunk processing (v4 and v6) 5590 */ 5591void 5592sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5593 struct sockaddr *src, struct sockaddr *dst, 5594 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5595#if !defined(SCTP_WITH_NO_CSUM) 5596 uint8_t compute_crc, 5597#endif 5598 uint8_t ecn_bits, 5599 uint8_t mflowtype, uint32_t mflowid, 5600 uint32_t vrf_id, uint16_t port) 5601{ 5602 uint32_t high_tsn; 5603 int fwd_tsn_seen = 0, data_processed = 0; 5604 struct mbuf *m = *mm, *op_err; 5605 char msg[SCTP_DIAG_INFO_LEN]; 5606 int un_sent; 5607 int cnt_ctrl_ready = 0; 5608 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5609 struct sctp_tcb *stcb = NULL; 5610 struct sctp_nets *net = NULL; 5611 5612 SCTP_STAT_INCR(sctps_recvdatagrams); 5613#ifdef SCTP_AUDITING_ENABLED 5614 sctp_audit_log(0xE0, 1); 5615 sctp_auditing(0, inp, stcb, net); 5616#endif 5617#if !defined(SCTP_WITH_NO_CSUM) 5618 if (compute_crc != 0) { 5619 uint32_t check, calc_check; 5620 5621 check = sh->checksum; 5622 sh->checksum = 0; 5623 calc_check = sctp_calculate_cksum(m, iphlen); 5624 sh->checksum = check; 5625 if (calc_check != check) { 5626 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5627 calc_check, check, (void *)m, length, iphlen); 5628 stcb = sctp_findassociation_addr(m, offset, src, dst, 5629 sh, ch, &inp, &net, vrf_id); 5630#if defined(INET) || defined(INET6) 5631 if ((net != NULL) && (port != 0)) { 5632 if (net->port == 0) { 5633 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5634 } 5635 net->port = port; 5636 } 5637#endif 5638 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5639 net->flowtype = mflowtype; 5640 } 5641 if ((inp != NULL) && (stcb != NULL)) { 5642 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5643 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5644 } else if ((inp != NULL) && (stcb == NULL)) { 5645 inp_decr = inp; 5646 } 5647 SCTP_STAT_INCR(sctps_badsum); 5648 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5649 goto out; 5650 } 5651 } 5652#endif 5653 /* Destination port of 0 is illegal, based on RFC4960. */ 5654 if (sh->dest_port == 0) { 5655 SCTP_STAT_INCR(sctps_hdrops); 5656 goto out; 5657 } 5658 stcb = sctp_findassociation_addr(m, offset, src, dst, 5659 sh, ch, &inp, &net, vrf_id); 5660#if defined(INET) || defined(INET6) 5661 if ((net != NULL) && (port != 0)) { 5662 if (net->port == 0) { 5663 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5664 } 5665 net->port = port; 5666 } 5667#endif 5668 if ((net != NULL) && (mflowtype != M_HASHTYPE_NONE)) { 5669 net->flowtype = mflowtype; 5670 } 5671 if (inp == NULL) { 5672 SCTP_STAT_INCR(sctps_noport); 5673 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5674 goto out; 5675 } 5676 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5677 sctp_send_shutdown_complete2(src, dst, sh, 5678 mflowtype, mflowid, 5679 vrf_id, port); 5680 goto out; 5681 } 5682 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5683 goto out; 5684 } 5685 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5686 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5687 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5688 (ch->chunk_type != SCTP_INIT))) { 5689 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5690 "Out of the blue"); 5691 sctp_send_abort(m, iphlen, src, dst, 5692 sh, 0, op_err, 5693 mflowtype, mflowid, 5694 vrf_id, port); 5695 } 5696 } 5697 goto out; 5698 } else if (stcb == NULL) { 5699 inp_decr = inp; 5700 } 5701#ifdef IPSEC 5702 /*- 5703 * I very much doubt any of the IPSEC stuff will work but I have no 5704 * idea, so I will leave it in place. 5705 */ 5706 if (inp != NULL) { 5707 switch (dst->sa_family) { 5708#ifdef INET 5709 case AF_INET: 5710 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5711 IPSECSTAT_INC(ips_in_polvio); 5712 SCTP_STAT_INCR(sctps_hdrops); 5713 goto out; 5714 } 5715 break; 5716#endif 5717#ifdef INET6 5718 case AF_INET6: 5719 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5720 IPSEC6STAT_INC(ips_in_polvio); 5721 SCTP_STAT_INCR(sctps_hdrops); 5722 goto out; 5723 } 5724 break; 5725#endif 5726 default: 5727 break; 5728 } 5729 } 5730#endif 5731 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5732 (void *)m, iphlen, offset, length, (void *)stcb); 5733 if (stcb) { 5734 /* always clear this before beginning a packet */ 5735 stcb->asoc.authenticated = 0; 5736 stcb->asoc.seen_a_sack_this_pkt = 0; 5737 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5738 (void *)stcb, stcb->asoc.state); 5739 5740 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5741 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5742 /*- 5743 * If we hit here, we had a ref count 5744 * up when the assoc was aborted and the 5745 * timer is clearing out the assoc, we should 5746 * NOT respond to any packet.. its OOTB. 5747 */ 5748 SCTP_TCB_UNLOCK(stcb); 5749 stcb = NULL; 5750 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5751 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5752 msg); 5753 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5754 mflowtype, mflowid, 5755 vrf_id, port); 5756 goto out; 5757 } 5758 } 5759 if (IS_SCTP_CONTROL(ch)) { 5760 /* process the control portion of the SCTP packet */ 5761 /* sa_ignore NO_NULL_CHK */ 5762 stcb = sctp_process_control(m, iphlen, &offset, length, 5763 src, dst, sh, ch, 5764 inp, stcb, &net, &fwd_tsn_seen, 5765 mflowtype, mflowid, 5766 vrf_id, port); 5767 if (stcb) { 5768 /* 5769 * This covers us if the cookie-echo was there and 5770 * it changes our INP. 5771 */ 5772 inp = stcb->sctp_ep; 5773#if defined(INET) || defined(INET6) 5774 if ((net) && (port)) { 5775 if (net->port == 0) { 5776 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5777 } 5778 net->port = port; 5779 } 5780#endif 5781 } 5782 } else { 5783 /* 5784 * no control chunks, so pre-process DATA chunks (these 5785 * checks are taken care of by control processing) 5786 */ 5787 5788 /* 5789 * if DATA only packet, and auth is required, then punt... 5790 * can't have authenticated without any AUTH (control) 5791 * chunks 5792 */ 5793 if ((stcb != NULL) && 5794 (stcb->asoc.auth_supported == 1) && 5795 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5796 /* "silently" ignore */ 5797 SCTP_STAT_INCR(sctps_recvauthmissing); 5798 goto out; 5799 } 5800 if (stcb == NULL) { 5801 /* out of the blue DATA chunk */ 5802 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5803 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5804 msg); 5805 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5806 mflowtype, mflowid, 5807 vrf_id, port); 5808 goto out; 5809 } 5810 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5811 /* v_tag mismatch! */ 5812 SCTP_STAT_INCR(sctps_badvtag); 5813 goto out; 5814 } 5815 } 5816 5817 if (stcb == NULL) { 5818 /* 5819 * no valid TCB for this packet, or we found it's a bad 5820 * packet while processing control, or we're done with this 5821 * packet (done or skip rest of data), so we drop it... 5822 */ 5823 goto out; 5824 } 5825 /* 5826 * DATA chunk processing 5827 */ 5828 /* plow through the data chunks while length > offset */ 5829 5830 /* 5831 * Rest should be DATA only. Check authentication state if AUTH for 5832 * DATA is required. 5833 */ 5834 if ((length > offset) && 5835 (stcb != NULL) && 5836 (stcb->asoc.auth_supported == 1) && 5837 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5838 !stcb->asoc.authenticated) { 5839 /* "silently" ignore */ 5840 SCTP_STAT_INCR(sctps_recvauthmissing); 5841 SCTPDBG(SCTP_DEBUG_AUTH1, 5842 "Data chunk requires AUTH, skipped\n"); 5843 goto trigger_send; 5844 } 5845 if (length > offset) { 5846 int retval; 5847 5848 /* 5849 * First check to make sure our state is correct. We would 5850 * not get here unless we really did have a tag, so we don't 5851 * abort if this happens, just dump the chunk silently. 5852 */ 5853 switch (SCTP_GET_STATE(&stcb->asoc)) { 5854 case SCTP_STATE_COOKIE_ECHOED: 5855 /* 5856 * we consider data with valid tags in this state 5857 * shows us the cookie-ack was lost. Imply it was 5858 * there. 5859 */ 5860 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5861 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5862 stcb->asoc.overall_error_count, 5863 0, 5864 SCTP_FROM_SCTP_INPUT, 5865 __LINE__); 5866 } 5867 stcb->asoc.overall_error_count = 0; 5868 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5869 break; 5870 case SCTP_STATE_COOKIE_WAIT: 5871 /* 5872 * We consider OOTB any data sent during asoc setup. 5873 */ 5874 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5875 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5876 msg); 5877 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5878 mflowtype, mflowid, 5879 vrf_id, port); 5880 goto out; 5881 /* sa_ignore NOTREACHED */ 5882 break; 5883 case SCTP_STATE_EMPTY: /* should not happen */ 5884 case SCTP_STATE_INUSE: /* should not happen */ 5885 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5886 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5887 default: 5888 goto out; 5889 /* sa_ignore NOTREACHED */ 5890 break; 5891 case SCTP_STATE_OPEN: 5892 case SCTP_STATE_SHUTDOWN_SENT: 5893 break; 5894 } 5895 /* plow through the data chunks while length > offset */ 5896 retval = sctp_process_data(mm, iphlen, &offset, length, 5897 src, dst, sh, 5898 inp, stcb, net, &high_tsn, 5899 mflowtype, mflowid, 5900 vrf_id, port); 5901 if (retval == 2) { 5902 /* 5903 * The association aborted, NO UNLOCK needed since 5904 * the association is destroyed. 5905 */ 5906 stcb = NULL; 5907 goto out; 5908 } 5909 data_processed = 1; 5910 /* 5911 * Anything important needs to have been m_copy'ed in 5912 * process_data 5913 */ 5914 } 5915 /* take care of ecn */ 5916 if ((data_processed == 1) && 5917 (stcb->asoc.ecn_supported == 1) && 5918 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5919 /* Yep, we need to add a ECNE */ 5920 sctp_send_ecn_echo(stcb, net, high_tsn); 5921 } 5922 if ((data_processed == 0) && (fwd_tsn_seen)) { 5923 int was_a_gap; 5924 uint32_t highest_tsn; 5925 5926 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5927 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5928 } else { 5929 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5930 } 5931 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5932 stcb->asoc.send_sack = 1; 5933 sctp_sack_check(stcb, was_a_gap); 5934 } else if (fwd_tsn_seen) { 5935 stcb->asoc.send_sack = 1; 5936 } 5937 /* trigger send of any chunks in queue... */ 5938trigger_send: 5939#ifdef SCTP_AUDITING_ENABLED 5940 sctp_audit_log(0xE0, 2); 5941 sctp_auditing(1, inp, stcb, net); 5942#endif 5943 SCTPDBG(SCTP_DEBUG_INPUT1, 5944 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5945 stcb->asoc.peers_rwnd, 5946 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5947 stcb->asoc.total_flight); 5948 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5949 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5950 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5951 } 5952 if (cnt_ctrl_ready || 5953 ((un_sent) && 5954 (stcb->asoc.peers_rwnd > 0 || 5955 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5956 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5957 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5958 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5959 } 5960#ifdef SCTP_AUDITING_ENABLED 5961 sctp_audit_log(0xE0, 3); 5962 sctp_auditing(2, inp, stcb, net); 5963#endif 5964out: 5965 if (stcb != NULL) { 5966 SCTP_TCB_UNLOCK(stcb); 5967 } 5968 if (inp_decr != NULL) { 5969 /* reduce ref-count */ 5970 SCTP_INP_WLOCK(inp_decr); 5971 SCTP_INP_DECR_REF(inp_decr); 5972 SCTP_INP_WUNLOCK(inp_decr); 5973 } 5974#ifdef INVARIANTS 5975 if (inp != NULL) { 5976 sctp_validate_no_locks(inp); 5977 } 5978#endif 5979 return; 5980} 5981 5982#if 0 5983static void 5984sctp_print_mbuf_chain(struct mbuf *m) 5985{ 5986 for (; m; m = SCTP_BUF_NEXT(m)) { 5987 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 5988 if (SCTP_BUF_IS_EXTENDED(m)) 5989 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 5990 } 5991} 5992 5993#endif 5994 5995#ifdef INET 5996void 5997sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5998{ 5999 struct mbuf *m; 6000 int iphlen; 6001 uint32_t vrf_id = 0; 6002 uint8_t ecn_bits; 6003 struct sockaddr_in src, dst; 6004 struct ip *ip; 6005 struct sctphdr *sh; 6006 struct sctp_chunkhdr *ch; 6007 int length, offset; 6008 6009#if !defined(SCTP_WITH_NO_CSUM) 6010 uint8_t compute_crc; 6011 6012#endif 6013 uint32_t mflowid; 6014 uint8_t mflowtype; 6015 6016 iphlen = off; 6017 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6018 SCTP_RELEASE_PKT(i_pak); 6019 return; 6020 } 6021 m = SCTP_HEADER_TO_CHAIN(i_pak); 6022#ifdef SCTP_MBUF_LOGGING 6023 /* Log in any input mbufs */ 6024 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6025 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6026 } 6027#endif 6028#ifdef SCTP_PACKET_LOGGING 6029 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6030 sctp_packet_log(m); 6031 } 6032#endif 6033 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6034 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6035 m->m_pkthdr.len, 6036 if_name(m->m_pkthdr.rcvif), 6037 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6038 mflowid = m->m_pkthdr.flowid; 6039 mflowtype = M_HASHTYPE_GET(m); 6040 SCTP_STAT_INCR(sctps_recvpackets); 6041 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6042 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6043 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6044 if (SCTP_BUF_LEN(m) < offset) { 6045 if ((m = m_pullup(m, offset)) == NULL) { 6046 SCTP_STAT_INCR(sctps_hdrops); 6047 return; 6048 } 6049 } 6050 ip = mtod(m, struct ip *); 6051 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6052 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6053 offset -= sizeof(struct sctp_chunkhdr); 6054 memset(&src, 0, sizeof(struct sockaddr_in)); 6055 src.sin_family = AF_INET; 6056 src.sin_len = sizeof(struct sockaddr_in); 6057 src.sin_port = sh->src_port; 6058 src.sin_addr = ip->ip_src; 6059 memset(&dst, 0, sizeof(struct sockaddr_in)); 6060 dst.sin_family = AF_INET; 6061 dst.sin_len = sizeof(struct sockaddr_in); 6062 dst.sin_port = sh->dest_port; 6063 dst.sin_addr = ip->ip_dst; 6064 length = ntohs(ip->ip_len); 6065 /* Validate mbuf chain length with IP payload length. */ 6066 if (SCTP_HEADER_LEN(m) != length) { 6067 SCTPDBG(SCTP_DEBUG_INPUT1, 6068 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6069 SCTP_STAT_INCR(sctps_hdrops); 6070 goto out; 6071 } 6072 /* SCTP does not allow broadcasts or multicasts */ 6073 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6074 goto out; 6075 } 6076 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6077 goto out; 6078 } 6079 ecn_bits = ip->ip_tos; 6080#if defined(SCTP_WITH_NO_CSUM) 6081 SCTP_STAT_INCR(sctps_recvnocrc); 6082#else 6083 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6084 SCTP_STAT_INCR(sctps_recvhwcrc); 6085 compute_crc = 0; 6086 } else { 6087 SCTP_STAT_INCR(sctps_recvswcrc); 6088 compute_crc = 1; 6089 } 6090#endif 6091 sctp_common_input_processing(&m, iphlen, offset, length, 6092 (struct sockaddr *)&src, 6093 (struct sockaddr *)&dst, 6094 sh, ch, 6095#if !defined(SCTP_WITH_NO_CSUM) 6096 compute_crc, 6097#endif 6098 ecn_bits, 6099 mflowtype, mflowid, 6100 vrf_id, port); 6101out: 6102 if (m) { 6103 sctp_m_freem(m); 6104 } 6105 return; 6106} 6107 6108#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6109extern int *sctp_cpuarry; 6110 6111#endif 6112 6113void 6114sctp_input(struct mbuf *m, int off) 6115{ 6116#if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6117 struct ip *ip; 6118 struct sctphdr *sh; 6119 int offset; 6120 int cpu_to_use; 6121 uint32_t flowid, tag; 6122 6123 if (mp_ncpus > 1) { 6124 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6125 flowid = m->m_pkthdr.flowid; 6126 } else { 6127 /* 6128 * No flow id built by lower layers fix it so we 6129 * create one. 6130 */ 6131 offset = off + sizeof(struct sctphdr); 6132 if (SCTP_BUF_LEN(m) < offset) { 6133 if ((m = m_pullup(m, offset)) == NULL) { 6134 SCTP_STAT_INCR(sctps_hdrops); 6135 return; 6136 } 6137 } 6138 ip = mtod(m, struct ip *); 6139 sh = (struct sctphdr *)((caddr_t)ip + off); 6140 tag = htonl(sh->v_tag); 6141 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6142 m->m_pkthdr.flowid = flowid; 6143 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE); 6144 } 6145 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6146 sctp_queue_to_mcore(m, off, cpu_to_use); 6147 return; 6148 } 6149#endif 6150 sctp_input_with_port(m, off, 0); 6151} 6152 6153#endif 6154