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 #ifdef __FreeBSD__ 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD: head/sys/netinet/sctp_input.c 263237 2014-03-16 12:32:16Z tuexen $"); 36 #endif 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #if !defined(__Userspace_os_Windows) 53 #include <netinet/udp.h> 54 #endif 55 #if defined(__FreeBSD__) 56 #include <sys/smp.h> 57 #endif 58 59 #if defined(__APPLE__) 60 #define APPLE_FILE_NO 2 61 #endif 62 63 64 static void 65 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 66 { 67 struct sctp_nets *net; 68 69 /* This now not only stops all cookie timers 70 * it also stops any INIT timers as well. This 71 * will make sure that the timers are stopped in 72 * all collision cases. 73 */ 74 SCTP_TCB_LOCK_ASSERT(stcb); 75 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 76 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 77 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 78 stcb->sctp_ep, 79 stcb, 80 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_1); 81 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 82 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 83 stcb->sctp_ep, 84 stcb, 85 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_2); 86 } 87 } 88 } 89 90 /* INIT handler */ 91 static void 92 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 93 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 94 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 95 struct sctp_tcb *stcb, int *abort_no_unlock, 96 #if defined(__FreeBSD__) 97 uint8_t use_mflowid, uint32_t mflowid, 98 #endif 99 uint32_t vrf_id, uint16_t port) 100 { 101 struct sctp_init *init; 102 struct mbuf *op_err; 103 104 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 105 (void *)stcb); 106 if (stcb == NULL) { 107 SCTP_INP_RLOCK(inp); 108 } 109 /* validate length */ 110 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 111 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 112 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 113 #if defined(__FreeBSD__) 114 use_mflowid, mflowid, 115 #endif 116 vrf_id, port); 117 if (stcb) 118 *abort_no_unlock = 1; 119 goto outnow; 120 } 121 /* validate parameters */ 122 init = &cp->init; 123 if (init->initiate_tag == 0) { 124 /* protocol error... send abort */ 125 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 126 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 127 #if defined(__FreeBSD__) 128 use_mflowid, mflowid, 129 #endif 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 136 /* invalid parameter... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 #if defined(__FreeBSD__) 140 use_mflowid, mflowid, 141 #endif 142 vrf_id, port); 143 if (stcb) 144 *abort_no_unlock = 1; 145 goto outnow; 146 } 147 if (init->num_inbound_streams == 0) { 148 /* protocol error... send abort */ 149 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 150 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 151 #if defined(__FreeBSD__) 152 use_mflowid, mflowid, 153 #endif 154 vrf_id, port); 155 if (stcb) 156 *abort_no_unlock = 1; 157 goto outnow; 158 } 159 if (init->num_outbound_streams == 0) { 160 /* protocol error... send abort */ 161 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 162 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 163 #if defined(__FreeBSD__) 164 use_mflowid, mflowid, 165 #endif 166 vrf_id, port); 167 if (stcb) 168 *abort_no_unlock = 1; 169 goto outnow; 170 } 171 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 172 offset + ntohs(cp->ch.chunk_length))) { 173 /* auth parameter(s) error... send abort */ 174 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 175 "Problem with AUTH parameters"); 176 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 177 #if defined(__FreeBSD__) 178 use_mflowid, mflowid, 179 #endif 180 vrf_id, port); 181 if (stcb) 182 *abort_no_unlock = 1; 183 goto outnow; 184 } 185 /* We are only accepting if we have a socket with positive so_qlimit.*/ 186 if ((stcb == NULL) && 187 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 188 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 189 (inp->sctp_socket == NULL) || 190 (inp->sctp_socket->so_qlimit == 0))) { 191 /* 192 * FIX ME ?? What about TCP model and we have a 193 * match/restart case? Actually no fix is needed. 194 * the lookup will always find the existing assoc so stcb 195 * would not be NULL. It may be questionable to do this 196 * since we COULD just send back the INIT-ACK and hope that 197 * the app did accept()'s by the time the COOKIE was sent. But 198 * there is a price to pay for COOKIE generation and I don't 199 * want to pay it on the chance that the app will actually do 200 * some accepts(). The App just looses and should NOT be in 201 * this state :-) 202 */ 203 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 204 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 205 "No listener"); 206 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 207 #if defined(__FreeBSD__) 208 use_mflowid, mflowid, 209 #endif 210 vrf_id, port); 211 } 212 goto outnow; 213 } 214 if ((stcb != NULL) && 215 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 216 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 217 sctp_send_shutdown_ack(stcb, NULL); 218 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 219 } else { 220 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 221 sctp_send_initiate_ack(inp, stcb, m, iphlen, offset, src, dst, 222 sh, cp, 223 #if defined(__FreeBSD__) 224 use_mflowid, mflowid, 225 #endif 226 vrf_id, port, 227 ((stcb == NULL) ? SCTP_HOLDS_LOCK : SCTP_NOT_LOCKED)); 228 } 229 outnow: 230 if (stcb == NULL) { 231 SCTP_INP_RUNLOCK(inp); 232 } 233 } 234 235 /* 236 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 237 */ 238 239 int 240 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 241 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 242 SCTP_UNUSED 243 #endif 244 ) 245 { 246 int unsent_data = 0; 247 unsigned int i; 248 struct sctp_stream_queue_pending *sp; 249 struct sctp_association *asoc; 250 251 /* This function returns the number of streams that have 252 * true unsent data on them. Note that as it looks through 253 * it will clean up any places that have old data that 254 * has been sent but left at top of stream queue. 255 */ 256 asoc = &stcb->asoc; 257 SCTP_TCB_SEND_LOCK(stcb); 258 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 259 /* Check to see if some data queued */ 260 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 261 /*sa_ignore FREED_MEMORY*/ 262 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 263 if (sp == NULL) { 264 continue; 265 } 266 if ((sp->msg_is_complete) && 267 (sp->length == 0) && 268 (sp->sender_all_done)) { 269 /* We are doing differed cleanup. Last 270 * time through when we took all the data 271 * the sender_all_done was not set. 272 */ 273 if (sp->put_last_out == 0) { 274 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 275 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 276 sp->sender_all_done, 277 sp->length, 278 sp->msg_is_complete, 279 sp->put_last_out); 280 } 281 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 282 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 283 if (sp->net) { 284 sctp_free_remote_addr(sp->net); 285 sp->net = NULL; 286 } 287 if (sp->data) { 288 sctp_m_freem(sp->data); 289 sp->data = NULL; 290 } 291 sctp_free_a_strmoq(stcb, sp, so_locked); 292 } else { 293 unsent_data++; 294 break; 295 } 296 } 297 } 298 SCTP_TCB_SEND_UNLOCK(stcb); 299 return (unsent_data); 300 } 301 302 static int 303 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 304 { 305 struct sctp_init *init; 306 struct sctp_association *asoc; 307 struct sctp_nets *lnet; 308 unsigned int i; 309 310 init = &cp->init; 311 asoc = &stcb->asoc; 312 /* save off parameters */ 313 asoc->peer_vtag = ntohl(init->initiate_tag); 314 asoc->peers_rwnd = ntohl(init->a_rwnd); 315 /* init tsn's */ 316 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 317 318 if (!TAILQ_EMPTY(&asoc->nets)) { 319 /* update any ssthresh's that may have a default */ 320 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 321 lnet->ssthresh = asoc->peers_rwnd; 322 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) { 323 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 324 } 325 326 } 327 } 328 SCTP_TCB_SEND_LOCK(stcb); 329 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 330 unsigned int newcnt; 331 struct sctp_stream_out *outs; 332 struct sctp_stream_queue_pending *sp, *nsp; 333 struct sctp_tmit_chunk *chk, *nchk; 334 335 /* abandon the upper streams */ 336 newcnt = ntohs(init->num_inbound_streams); 337 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 338 if (chk->rec.data.stream_number >= newcnt) { 339 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 340 asoc->send_queue_cnt--; 341 if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) { 342 asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--; 343 #ifdef INVARIANTS 344 } else { 345 panic("No chunks on the queues for sid %u.", chk->rec.data.stream_number); 346 #endif 347 } 348 if (chk->data != NULL) { 349 sctp_free_bufspace(stcb, asoc, chk, 1); 350 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 351 0, chk, SCTP_SO_NOT_LOCKED); 352 if (chk->data) { 353 sctp_m_freem(chk->data); 354 chk->data = NULL; 355 } 356 } 357 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 358 /*sa_ignore FREED_MEMORY*/ 359 } 360 } 361 if (asoc->strmout) { 362 for (i = newcnt; i < asoc->pre_open_streams; i++) { 363 outs = &asoc->strmout[i]; 364 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 365 TAILQ_REMOVE(&outs->outqueue, sp, next); 366 asoc->stream_queue_cnt--; 367 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 368 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 369 if (sp->data) { 370 sctp_m_freem(sp->data); 371 sp->data = NULL; 372 } 373 if (sp->net) { 374 sctp_free_remote_addr(sp->net); 375 sp->net = NULL; 376 } 377 /* Free the chunk */ 378 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 379 /*sa_ignore FREED_MEMORY*/ 380 } 381 } 382 } 383 /* cut back the count */ 384 asoc->pre_open_streams = newcnt; 385 } 386 SCTP_TCB_SEND_UNLOCK(stcb); 387 asoc->strm_realoutsize = asoc->streamoutcnt = asoc->pre_open_streams; 388 389 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 390 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 391 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 392 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 393 } 394 /* This is the next one we expect */ 395 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 396 397 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 398 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 399 400 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 401 /* open the requested streams */ 402 403 if (asoc->strmin != NULL) { 404 /* Free the old ones */ 405 struct sctp_queued_to_read *ctl, *nctl; 406 407 for (i = 0; i < asoc->streamincnt; i++) { 408 TAILQ_FOREACH_SAFE(ctl, &asoc->strmin[i].inqueue, next, nctl) { 409 TAILQ_REMOVE(&asoc->strmin[i].inqueue, ctl, next); 410 sctp_free_remote_addr(ctl->whoFrom); 411 ctl->whoFrom = NULL; 412 sctp_m_freem(ctl->data); 413 ctl->data = NULL; 414 sctp_free_a_readq(stcb, ctl); 415 } 416 } 417 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 418 } 419 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 420 asoc->streamincnt = ntohs(init->num_outbound_streams); 421 } else { 422 asoc->streamincnt = asoc->max_inbound_streams; 423 } 424 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 425 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 426 if (asoc->strmin == NULL) { 427 /* we didn't get memory for the streams! */ 428 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 429 return (-1); 430 } 431 for (i = 0; i < asoc->streamincnt; i++) { 432 asoc->strmin[i].stream_no = i; 433 asoc->strmin[i].last_sequence_delivered = 0xffff; 434 TAILQ_INIT(&asoc->strmin[i].inqueue); 435 asoc->strmin[i].delivery_started = 0; 436 } 437 /* 438 * load_address_from_init will put the addresses into the 439 * association when the COOKIE is processed or the INIT-ACK is 440 * processed. Both types of COOKIE's existing and new call this 441 * routine. It will remove addresses that are no longer in the 442 * association (for the restarting case where addresses are 443 * removed). Up front when the INIT arrives we will discard it if it 444 * is a restart and new addresses have been added. 445 */ 446 /* sa_ignore MEMLEAK */ 447 return (0); 448 } 449 450 /* 451 * INIT-ACK message processing/consumption returns value < 0 on error 452 */ 453 static int 454 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 455 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 456 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 457 struct sctp_nets *net, int *abort_no_unlock, 458 #if defined(__FreeBSD__) 459 uint8_t use_mflowid, uint32_t mflowid, 460 #endif 461 uint32_t vrf_id) 462 { 463 struct sctp_association *asoc; 464 struct mbuf *op_err; 465 int retval, abort_flag; 466 uint32_t initack_limit; 467 int nat_friendly = 0; 468 469 /* First verify that we have no illegal param's */ 470 abort_flag = 0; 471 472 op_err = sctp_arethere_unrecognized_parameters(m, 473 (offset + sizeof(struct sctp_init_chunk)), 474 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 475 if (abort_flag) { 476 /* Send an abort and notify peer */ 477 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 478 *abort_no_unlock = 1; 479 return (-1); 480 } 481 asoc = &stcb->asoc; 482 asoc->peer_supports_nat = (uint8_t)nat_friendly; 483 /* process the peer's parameters in the INIT-ACK */ 484 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 485 if (retval < 0) { 486 return (retval); 487 } 488 initack_limit = offset + ntohs(cp->ch.chunk_length); 489 /* load all addresses */ 490 if ((retval = sctp_load_addresses_from_init(stcb, m, 491 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 492 src, dst, NULL))) { 493 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 494 "Problem with address parameters"); 495 SCTPDBG(SCTP_DEBUG_INPUT1, 496 "Load addresses from INIT causes an abort %d\n", 497 retval); 498 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 499 src, dst, sh, op_err, 500 #if defined(__FreeBSD__) 501 use_mflowid, mflowid, 502 #endif 503 vrf_id, net->port); 504 *abort_no_unlock = 1; 505 return (-1); 506 } 507 /* if the peer doesn't support asconf, flush the asconf queue */ 508 if (asoc->peer_supports_asconf == 0) { 509 struct sctp_asconf_addr *param, *nparam; 510 511 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 512 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 513 SCTP_FREE(param, SCTP_M_ASC_ADDR); 514 } 515 } 516 517 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 518 stcb->asoc.local_hmacs); 519 if (op_err) { 520 sctp_queue_op_err(stcb, op_err); 521 /* queuing will steal away the mbuf chain to the out queue */ 522 op_err = NULL; 523 } 524 /* extract the cookie and queue it to "echo" it back... */ 525 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 526 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 527 stcb->asoc.overall_error_count, 528 0, 529 SCTP_FROM_SCTP_INPUT, 530 __LINE__); 531 } 532 stcb->asoc.overall_error_count = 0; 533 net->error_count = 0; 534 535 /* 536 * Cancel the INIT timer, We do this first before queueing the 537 * cookie. We always cancel at the primary to assue that we are 538 * canceling the timer started by the INIT which always goes to the 539 * primary. 540 */ 541 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 542 asoc->primary_destination, SCTP_FROM_SCTP_INPUT+SCTP_LOC_4); 543 544 /* calculate the RTO */ 545 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, sctp_align_safe_nocopy, 546 SCTP_RTT_FROM_NON_DATA); 547 548 retval = sctp_send_cookie_echo(m, offset, stcb, net); 549 if (retval < 0) { 550 /* 551 * No cookie, we probably should send a op error. But in any 552 * case if there is no cookie in the INIT-ACK, we can 553 * abandon the peer, its broke. 554 */ 555 if (retval == -3) { 556 /* We abort with an error of missing mandatory param */ 557 op_err = sctp_generate_cause(SCTP_CAUSE_MISSING_PARAM, ""); 558 if (op_err) { 559 /* 560 * Expand beyond to include the mandatory 561 * param cookie 562 */ 563 struct sctp_inv_mandatory_param *mp; 564 565 SCTP_BUF_LEN(op_err) = 566 sizeof(struct sctp_inv_mandatory_param); 567 mp = mtod(op_err, 568 struct sctp_inv_mandatory_param *); 569 /* Subtract the reserved param */ 570 mp->length = 571 htons(sizeof(struct sctp_inv_mandatory_param) - 2); 572 mp->num_param = htonl(1); 573 mp->param = htons(SCTP_STATE_COOKIE); 574 mp->resv = 0; 575 } 576 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 577 src, dst, sh, op_err, 578 #if defined(__FreeBSD__) 579 use_mflowid, mflowid, 580 #endif 581 vrf_id, net->port); 582 *abort_no_unlock = 1; 583 } 584 return (retval); 585 } 586 587 return (0); 588 } 589 590 static void 591 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 592 struct sctp_tcb *stcb, struct sctp_nets *net) 593 { 594 struct sockaddr_storage store; 595 struct sctp_nets *r_net, *f_net; 596 struct timeval tv; 597 int req_prim = 0; 598 uint16_t old_error_counter; 599 #ifdef INET 600 struct sockaddr_in *sin; 601 #endif 602 #ifdef INET6 603 struct sockaddr_in6 *sin6; 604 #endif 605 #if defined(__Userspace__) 606 struct sockaddr_conn *sconn; 607 #endif 608 609 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 610 /* Invalid length */ 611 return; 612 } 613 614 memset(&store, 0, sizeof(store)); 615 switch (cp->heartbeat.hb_info.addr_family) { 616 #ifdef INET 617 case AF_INET: 618 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 619 sin = (struct sockaddr_in *)&store; 620 sin->sin_family = cp->heartbeat.hb_info.addr_family; 621 #ifdef HAVE_SIN_LEN 622 sin->sin_len = cp->heartbeat.hb_info.addr_len; 623 #endif 624 sin->sin_port = stcb->rport; 625 memcpy(&sin->sin_addr, cp->heartbeat.hb_info.address, 626 sizeof(sin->sin_addr)); 627 } else { 628 return; 629 } 630 break; 631 #endif 632 #ifdef INET6 633 case AF_INET6: 634 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 635 sin6 = (struct sockaddr_in6 *)&store; 636 sin6->sin6_family = cp->heartbeat.hb_info.addr_family; 637 #ifdef HAVE_SIN6_LEN 638 sin6->sin6_len = cp->heartbeat.hb_info.addr_len; 639 #endif 640 sin6->sin6_port = stcb->rport; 641 memcpy(&sin6->sin6_addr, cp->heartbeat.hb_info.address, 642 sizeof(sin6->sin6_addr)); 643 } else { 644 return; 645 } 646 break; 647 #endif 648 #if defined(__Userspace__) 649 case AF_CONN: 650 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) { 651 sconn = (struct sockaddr_conn *)&store; 652 sconn->sconn_family = cp->heartbeat.hb_info.addr_family; 653 #ifdef HAVE_SCONN_LEN 654 sconn->sconn_len = cp->heartbeat.hb_info.addr_len; 655 #endif 656 sconn->sconn_port = stcb->rport; 657 memcpy(&sconn->sconn_addr, cp->heartbeat.hb_info.address, 658 sizeof(sconn->sconn_addr)); 659 } else { 660 return; 661 } 662 break; 663 #endif 664 default: 665 return; 666 } 667 r_net = sctp_findnet(stcb, (struct sockaddr *)&store); 668 if (r_net == NULL) { 669 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 670 return; 671 } 672 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 673 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 674 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 675 /* 676 * If the its a HB and it's random value is correct when can 677 * confirm the destination. 678 */ 679 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 680 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 681 stcb->asoc.primary_destination = r_net; 682 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 683 f_net = TAILQ_FIRST(&stcb->asoc.nets); 684 if (f_net != r_net) { 685 /* first one on the list is NOT the primary 686 * sctp_cmpaddr() is much more efficent if 687 * the primary is the first on the list, make it 688 * so. 689 */ 690 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 691 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 692 } 693 req_prim = 1; 694 } 695 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 696 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 697 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 698 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 699 } 700 old_error_counter = r_net->error_count; 701 r_net->error_count = 0; 702 r_net->hb_responded = 1; 703 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 704 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 705 /* Now lets do a RTO with this */ 706 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, sctp_align_safe_nocopy, 707 SCTP_RTT_FROM_NON_DATA); 708 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 709 r_net->dest_state |= SCTP_ADDR_REACHABLE; 710 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 711 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 712 } 713 if (r_net->dest_state & SCTP_ADDR_PF) { 714 r_net->dest_state &= ~SCTP_ADDR_PF; 715 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 716 } 717 if (old_error_counter > 0) { 718 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 719 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 720 } 721 if (r_net == stcb->asoc.primary_destination) { 722 if (stcb->asoc.alternate) { 723 /* release the alternate, primary is good */ 724 sctp_free_remote_addr(stcb->asoc.alternate); 725 stcb->asoc.alternate = NULL; 726 } 727 } 728 /* Mobility adaptation */ 729 if (req_prim) { 730 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 731 SCTP_MOBILITY_BASE) || 732 sctp_is_mobility_feature_on(stcb->sctp_ep, 733 SCTP_MOBILITY_FASTHANDOFF)) && 734 sctp_is_mobility_feature_on(stcb->sctp_ep, 735 SCTP_MOBILITY_PRIM_DELETED)) { 736 737 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_TIMER+SCTP_LOC_7); 738 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 739 SCTP_MOBILITY_FASTHANDOFF)) { 740 sctp_assoc_immediate_retrans(stcb, 741 stcb->asoc.primary_destination); 742 } 743 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 744 SCTP_MOBILITY_BASE)) { 745 sctp_move_chunks_from_net(stcb, 746 stcb->asoc.deleted_primary); 747 } 748 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 749 stcb->asoc.deleted_primary); 750 } 751 } 752 } 753 754 static int 755 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 756 { 757 /* return 0 means we want you to proceed with the abort 758 * non-zero means no abort processing 759 */ 760 struct sctpasochead *head; 761 762 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 763 /* generate a new vtag and send init */ 764 LIST_REMOVE(stcb, sctp_asocs); 765 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 766 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 767 /* put it in the bucket in the vtag hash of assoc's for the system */ 768 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 769 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 770 return (1); 771 } 772 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 773 /* treat like a case where the cookie expired i.e.: 774 * - dump current cookie. 775 * - generate a new vtag. 776 * - resend init. 777 */ 778 /* generate a new vtag and send init */ 779 LIST_REMOVE(stcb, sctp_asocs); 780 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 781 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 782 sctp_stop_all_cookie_timers(stcb); 783 sctp_toss_old_cookies(stcb, &stcb->asoc); 784 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 785 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 786 /* put it in the bucket in the vtag hash of assoc's for the system */ 787 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 788 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 789 return (1); 790 } 791 return (0); 792 } 793 794 static int 795 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 796 struct sctp_nets *net) 797 798 { 799 /* return 0 means we want you to proceed with the abort 800 * non-zero means no abort processing 801 */ 802 if (stcb->asoc.peer_supports_auth == 0) { 803 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 804 return (0); 805 } 806 sctp_asconf_send_nat_state_update(stcb, net); 807 return (1); 808 } 809 810 811 static void 812 sctp_handle_abort(struct sctp_abort_chunk *abort, 813 struct sctp_tcb *stcb, struct sctp_nets *net) 814 { 815 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 816 struct socket *so; 817 #endif 818 uint16_t len; 819 uint16_t error; 820 821 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 822 if (stcb == NULL) 823 return; 824 825 len = ntohs(abort->ch.chunk_length); 826 if (len > sizeof (struct sctp_chunkhdr)) { 827 /* Need to check the cause codes for our 828 * two magic nat aborts which don't kill the assoc 829 * necessarily. 830 */ 831 struct sctp_missing_nat_state *natc; 832 833 natc = (struct sctp_missing_nat_state *)(abort + 1); 834 error = ntohs(natc->cause); 835 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 836 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 837 abort->ch.chunk_flags); 838 if (sctp_handle_nat_colliding_state(stcb)) { 839 return; 840 } 841 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 842 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 843 abort->ch.chunk_flags); 844 if (sctp_handle_nat_missing_state(stcb, net)) { 845 return; 846 } 847 } 848 } else { 849 error = 0; 850 } 851 /* stop any receive timers */ 852 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_6); 853 /* notify user of the abort and clean up... */ 854 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 855 /* free the tcb */ 856 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 857 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 858 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 859 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 860 } 861 #ifdef SCTP_ASOCLOG_OF_TSNS 862 sctp_print_out_track_log(stcb); 863 #endif 864 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 865 so = SCTP_INP_SO(stcb->sctp_ep); 866 atomic_add_int(&stcb->asoc.refcnt, 1); 867 SCTP_TCB_UNLOCK(stcb); 868 SCTP_SOCKET_LOCK(so, 1); 869 SCTP_TCB_LOCK(stcb); 870 atomic_subtract_int(&stcb->asoc.refcnt, 1); 871 #endif 872 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 873 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 874 SCTP_FROM_SCTP_INPUT+SCTP_LOC_6); 875 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 876 SCTP_SOCKET_UNLOCK(so, 1); 877 #endif 878 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 879 } 880 881 static void 882 sctp_start_net_timers(struct sctp_tcb *stcb) 883 { 884 uint32_t cnt_hb_sent; 885 struct sctp_nets *net; 886 887 cnt_hb_sent = 0; 888 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 889 /* For each network start: 890 * 1) A pmtu timer. 891 * 2) A HB timer 892 * 3) If the dest in unconfirmed send 893 * a hb as well if under max_hb_burst have 894 * been sent. 895 */ 896 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 897 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 898 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 899 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 900 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 901 cnt_hb_sent++; 902 } 903 } 904 if (cnt_hb_sent) { 905 sctp_chunk_output(stcb->sctp_ep, stcb, 906 SCTP_OUTPUT_FROM_COOKIE_ACK, 907 SCTP_SO_NOT_LOCKED); 908 } 909 } 910 911 912 static void 913 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 914 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 915 { 916 struct sctp_association *asoc; 917 int some_on_streamwheel; 918 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 919 struct socket *so; 920 #endif 921 922 SCTPDBG(SCTP_DEBUG_INPUT2, 923 "sctp_handle_shutdown: handling SHUTDOWN\n"); 924 if (stcb == NULL) 925 return; 926 asoc = &stcb->asoc; 927 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 928 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 929 return; 930 } 931 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 932 /* Shutdown NOT the expected size */ 933 return; 934 } else { 935 sctp_update_acked(stcb, cp, abort_flag); 936 if (*abort_flag) { 937 return; 938 } 939 } 940 if (asoc->control_pdapi) { 941 /* With a normal shutdown 942 * we assume the end of last record. 943 */ 944 SCTP_INP_READ_LOCK(stcb->sctp_ep); 945 asoc->control_pdapi->end_added = 1; 946 asoc->control_pdapi->pdapi_aborted = 1; 947 asoc->control_pdapi = NULL; 948 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 950 so = SCTP_INP_SO(stcb->sctp_ep); 951 atomic_add_int(&stcb->asoc.refcnt, 1); 952 SCTP_TCB_UNLOCK(stcb); 953 SCTP_SOCKET_LOCK(so, 1); 954 SCTP_TCB_LOCK(stcb); 955 atomic_subtract_int(&stcb->asoc.refcnt, 1); 956 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 957 /* assoc was freed while we were unlocked */ 958 SCTP_SOCKET_UNLOCK(so, 1); 959 return; 960 } 961 #endif 962 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 963 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 964 SCTP_SOCKET_UNLOCK(so, 1); 965 #endif 966 } 967 /* goto SHUTDOWN_RECEIVED state to block new requests */ 968 if (stcb->sctp_socket) { 969 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 970 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 971 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 972 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 973 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 974 /* notify upper layer that peer has initiated a shutdown */ 975 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 976 977 /* reset time */ 978 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 979 } 980 } 981 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 982 /* 983 * stop the shutdown timer, since we WILL move to 984 * SHUTDOWN-ACK-SENT. 985 */ 986 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_8); 987 } 988 /* Now is there unsent data on a stream somewhere? */ 989 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 990 991 if (!TAILQ_EMPTY(&asoc->send_queue) || 992 !TAILQ_EMPTY(&asoc->sent_queue) || 993 some_on_streamwheel) { 994 /* By returning we will push more data out */ 995 return; 996 } else { 997 /* no outstanding data to send, so move on... */ 998 /* send SHUTDOWN-ACK */ 999 /* move to SHUTDOWN-ACK-SENT state */ 1000 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 1001 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1002 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1003 } 1004 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 1005 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 1006 sctp_stop_timers_for_shutdown(stcb); 1007 sctp_send_shutdown_ack(stcb, net); 1008 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, 1009 stcb, net); 1010 } 1011 } 1012 1013 static void 1014 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1015 struct sctp_tcb *stcb, 1016 struct sctp_nets *net) 1017 { 1018 struct sctp_association *asoc; 1019 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1020 struct socket *so; 1021 1022 so = SCTP_INP_SO(stcb->sctp_ep); 1023 #endif 1024 SCTPDBG(SCTP_DEBUG_INPUT2, 1025 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1026 if (stcb == NULL) 1027 return; 1028 1029 asoc = &stcb->asoc; 1030 /* process according to association state */ 1031 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1032 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1033 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1034 sctp_send_shutdown_complete(stcb, net, 1); 1035 SCTP_TCB_UNLOCK(stcb); 1036 return; 1037 } 1038 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1039 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1040 /* unexpected SHUTDOWN-ACK... so ignore... */ 1041 SCTP_TCB_UNLOCK(stcb); 1042 return; 1043 } 1044 if (asoc->control_pdapi) { 1045 /* With a normal shutdown 1046 * we assume the end of last record. 1047 */ 1048 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1049 asoc->control_pdapi->end_added = 1; 1050 asoc->control_pdapi->pdapi_aborted = 1; 1051 asoc->control_pdapi = NULL; 1052 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1053 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1054 atomic_add_int(&stcb->asoc.refcnt, 1); 1055 SCTP_TCB_UNLOCK(stcb); 1056 SCTP_SOCKET_LOCK(so, 1); 1057 SCTP_TCB_LOCK(stcb); 1058 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1059 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1060 /* assoc was freed while we were unlocked */ 1061 SCTP_SOCKET_UNLOCK(so, 1); 1062 return; 1063 } 1064 #endif 1065 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1067 SCTP_SOCKET_UNLOCK(so, 1); 1068 #endif 1069 } 1070 #ifdef INVARIANTS 1071 if (!TAILQ_EMPTY(&asoc->send_queue) || 1072 !TAILQ_EMPTY(&asoc->sent_queue) || 1073 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 1074 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1075 } 1076 #endif 1077 /* stop the timer */ 1078 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_9); 1079 /* send SHUTDOWN-COMPLETE */ 1080 sctp_send_shutdown_complete(stcb, net, 0); 1081 /* notify upper layer protocol */ 1082 if (stcb->sctp_socket) { 1083 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1084 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1085 stcb->sctp_socket->so_snd.sb_cc = 0; 1086 } 1087 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1088 } 1089 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1090 /* free the TCB but first save off the ep */ 1091 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1092 atomic_add_int(&stcb->asoc.refcnt, 1); 1093 SCTP_TCB_UNLOCK(stcb); 1094 SCTP_SOCKET_LOCK(so, 1); 1095 SCTP_TCB_LOCK(stcb); 1096 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1097 #endif 1098 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1099 SCTP_FROM_SCTP_INPUT+SCTP_LOC_10); 1100 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1101 SCTP_SOCKET_UNLOCK(so, 1); 1102 #endif 1103 } 1104 1105 /* 1106 * Skip past the param header and then we will find the chunk that caused the 1107 * problem. There are two possiblities ASCONF or FWD-TSN other than that and 1108 * our peer must be broken. 1109 */ 1110 static void 1111 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1112 struct sctp_nets *net) 1113 { 1114 struct sctp_chunkhdr *chk; 1115 1116 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1117 switch (chk->chunk_type) { 1118 case SCTP_ASCONF_ACK: 1119 case SCTP_ASCONF: 1120 sctp_asconf_cleanup(stcb, net); 1121 break; 1122 case SCTP_FORWARD_CUM_TSN: 1123 stcb->asoc.peer_supports_prsctp = 0; 1124 break; 1125 default: 1126 SCTPDBG(SCTP_DEBUG_INPUT2, 1127 "Peer does not support chunk type %d(%x)??\n", 1128 chk->chunk_type, (uint32_t) chk->chunk_type); 1129 break; 1130 } 1131 } 1132 1133 /* 1134 * Skip past the param header and then we will find the param that caused the 1135 * problem. There are a number of param's in a ASCONF OR the prsctp param 1136 * these will turn of specific features. 1137 */ 1138 static void 1139 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1140 { 1141 struct sctp_paramhdr *pbad; 1142 1143 pbad = phdr + 1; 1144 switch (ntohs(pbad->param_type)) { 1145 /* pr-sctp draft */ 1146 case SCTP_PRSCTP_SUPPORTED: 1147 stcb->asoc.peer_supports_prsctp = 0; 1148 break; 1149 case SCTP_SUPPORTED_CHUNK_EXT: 1150 break; 1151 /* draft-ietf-tsvwg-addip-sctp */ 1152 case SCTP_HAS_NAT_SUPPORT: 1153 stcb->asoc.peer_supports_nat = 0; 1154 break; 1155 case SCTP_ADD_IP_ADDRESS: 1156 case SCTP_DEL_IP_ADDRESS: 1157 case SCTP_SET_PRIM_ADDR: 1158 stcb->asoc.peer_supports_asconf = 0; 1159 break; 1160 case SCTP_SUCCESS_REPORT: 1161 case SCTP_ERROR_CAUSE_IND: 1162 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1163 SCTPDBG(SCTP_DEBUG_INPUT2, 1164 "Turning off ASCONF to this strange peer\n"); 1165 stcb->asoc.peer_supports_asconf = 0; 1166 break; 1167 default: 1168 SCTPDBG(SCTP_DEBUG_INPUT2, 1169 "Peer does not support param type %d(%x)??\n", 1170 pbad->param_type, (uint32_t) pbad->param_type); 1171 break; 1172 } 1173 } 1174 1175 static int 1176 sctp_handle_error(struct sctp_chunkhdr *ch, 1177 struct sctp_tcb *stcb, struct sctp_nets *net) 1178 { 1179 int chklen; 1180 struct sctp_paramhdr *phdr; 1181 uint16_t error, error_type; 1182 uint16_t error_len; 1183 struct sctp_association *asoc; 1184 int adjust; 1185 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1186 struct socket *so; 1187 #endif 1188 1189 /* parse through all of the errors and process */ 1190 asoc = &stcb->asoc; 1191 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1192 sizeof(struct sctp_chunkhdr)); 1193 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1194 error = 0; 1195 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1196 /* Process an Error Cause */ 1197 error_type = ntohs(phdr->param_type); 1198 error_len = ntohs(phdr->param_length); 1199 if ((error_len > chklen) || (error_len == 0)) { 1200 /* invalid param length for this param */ 1201 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1202 chklen, error_len); 1203 return (0); 1204 } 1205 if (error == 0) { 1206 /* report the first error cause */ 1207 error = error_type; 1208 } 1209 switch (error_type) { 1210 case SCTP_CAUSE_INVALID_STREAM: 1211 case SCTP_CAUSE_MISSING_PARAM: 1212 case SCTP_CAUSE_INVALID_PARAM: 1213 case SCTP_CAUSE_NO_USER_DATA: 1214 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1215 error_type); 1216 break; 1217 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1218 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1219 ch->chunk_flags); 1220 if (sctp_handle_nat_colliding_state(stcb)) { 1221 return (0); 1222 } 1223 break; 1224 case SCTP_CAUSE_NAT_MISSING_STATE: 1225 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1226 ch->chunk_flags); 1227 if (sctp_handle_nat_missing_state(stcb, net)) { 1228 return (0); 1229 } 1230 break; 1231 case SCTP_CAUSE_STALE_COOKIE: 1232 /* 1233 * We only act if we have echoed a cookie and are 1234 * waiting. 1235 */ 1236 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1237 int *p; 1238 1239 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1240 /* Save the time doubled */ 1241 asoc->cookie_preserve_req = ntohl(*p) << 1; 1242 asoc->stale_cookie_count++; 1243 if (asoc->stale_cookie_count > 1244 asoc->max_init_times) { 1245 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1246 /* now free the asoc */ 1247 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1248 so = SCTP_INP_SO(stcb->sctp_ep); 1249 atomic_add_int(&stcb->asoc.refcnt, 1); 1250 SCTP_TCB_UNLOCK(stcb); 1251 SCTP_SOCKET_LOCK(so, 1); 1252 SCTP_TCB_LOCK(stcb); 1253 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1254 #endif 1255 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1256 SCTP_FROM_SCTP_INPUT+SCTP_LOC_11); 1257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1258 SCTP_SOCKET_UNLOCK(so, 1); 1259 #endif 1260 return (-1); 1261 } 1262 /* blast back to INIT state */ 1263 sctp_toss_old_cookies(stcb, &stcb->asoc); 1264 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1265 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1266 sctp_stop_all_cookie_timers(stcb); 1267 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1268 } 1269 break; 1270 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1271 /* 1272 * Nothing we can do here, we don't do hostname 1273 * addresses so if the peer does not like my IPv6 1274 * (or IPv4 for that matter) it does not matter. If 1275 * they don't support that type of address, they can 1276 * NOT possibly get that packet type... i.e. with no 1277 * IPv6 you can't recieve a IPv6 packet. so we can 1278 * safely ignore this one. If we ever added support 1279 * for HOSTNAME Addresses, then we would need to do 1280 * something here. 1281 */ 1282 break; 1283 case SCTP_CAUSE_UNRECOG_CHUNK: 1284 sctp_process_unrecog_chunk(stcb, phdr, net); 1285 break; 1286 case SCTP_CAUSE_UNRECOG_PARAM: 1287 sctp_process_unrecog_param(stcb, phdr); 1288 break; 1289 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1290 /* 1291 * We ignore this since the timer will drive out a 1292 * new cookie anyway and there timer will drive us 1293 * to send a SHUTDOWN_COMPLETE. We can't send one 1294 * here since we don't have their tag. 1295 */ 1296 break; 1297 case SCTP_CAUSE_DELETING_LAST_ADDR: 1298 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1299 case SCTP_CAUSE_DELETING_SRC_ADDR: 1300 /* 1301 * We should NOT get these here, but in a 1302 * ASCONF-ACK. 1303 */ 1304 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1305 error_type); 1306 break; 1307 case SCTP_CAUSE_OUT_OF_RESC: 1308 /* 1309 * And what, pray tell do we do with the fact that 1310 * the peer is out of resources? Not really sure we 1311 * could do anything but abort. I suspect this 1312 * should have came WITH an abort instead of in a 1313 * OP-ERROR. 1314 */ 1315 break; 1316 default: 1317 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1318 error_type); 1319 break; 1320 } 1321 adjust = SCTP_SIZE32(error_len); 1322 chklen -= adjust; 1323 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1324 } 1325 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1326 return (0); 1327 } 1328 1329 static int 1330 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1331 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1332 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1333 struct sctp_nets *net, int *abort_no_unlock, 1334 #if defined(__FreeBSD__) 1335 uint8_t use_mflowid, uint32_t mflowid, 1336 #endif 1337 uint32_t vrf_id) 1338 { 1339 struct sctp_init_ack *init_ack; 1340 struct mbuf *op_err; 1341 1342 SCTPDBG(SCTP_DEBUG_INPUT2, 1343 "sctp_handle_init_ack: handling INIT-ACK\n"); 1344 1345 if (stcb == NULL) { 1346 SCTPDBG(SCTP_DEBUG_INPUT2, 1347 "sctp_handle_init_ack: TCB is null\n"); 1348 return (-1); 1349 } 1350 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1351 /* Invalid length */ 1352 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1353 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1354 src, dst, sh, op_err, 1355 #if defined(__FreeBSD__) 1356 use_mflowid, mflowid, 1357 #endif 1358 vrf_id, net->port); 1359 *abort_no_unlock = 1; 1360 return (-1); 1361 } 1362 init_ack = &cp->init; 1363 /* validate parameters */ 1364 if (init_ack->initiate_tag == 0) { 1365 /* protocol error... send an abort */ 1366 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1367 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1368 src, dst, sh, op_err, 1369 #if defined(__FreeBSD__) 1370 use_mflowid, mflowid, 1371 #endif 1372 vrf_id, net->port); 1373 *abort_no_unlock = 1; 1374 return (-1); 1375 } 1376 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1377 /* protocol error... send an abort */ 1378 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1379 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1380 src, dst, sh, op_err, 1381 #if defined(__FreeBSD__) 1382 use_mflowid, mflowid, 1383 #endif 1384 vrf_id, net->port); 1385 *abort_no_unlock = 1; 1386 return (-1); 1387 } 1388 if (init_ack->num_inbound_streams == 0) { 1389 /* protocol error... send an abort */ 1390 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1391 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1392 src, dst, sh, op_err, 1393 #if defined(__FreeBSD__) 1394 use_mflowid, mflowid, 1395 #endif 1396 vrf_id, net->port); 1397 *abort_no_unlock = 1; 1398 return (-1); 1399 } 1400 if (init_ack->num_outbound_streams == 0) { 1401 /* protocol error... send an abort */ 1402 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1403 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1404 src, dst, sh, op_err, 1405 #if defined(__FreeBSD__) 1406 use_mflowid, mflowid, 1407 #endif 1408 vrf_id, net->port); 1409 *abort_no_unlock = 1; 1410 return (-1); 1411 } 1412 /* process according to association state... */ 1413 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1414 case SCTP_STATE_COOKIE_WAIT: 1415 /* this is the expected state for this chunk */ 1416 /* process the INIT-ACK parameters */ 1417 if (stcb->asoc.primary_destination->dest_state & 1418 SCTP_ADDR_UNCONFIRMED) { 1419 /* 1420 * The primary is where we sent the INIT, we can 1421 * always consider it confirmed when the INIT-ACK is 1422 * returned. Do this before we load addresses 1423 * though. 1424 */ 1425 stcb->asoc.primary_destination->dest_state &= 1426 ~SCTP_ADDR_UNCONFIRMED; 1427 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1428 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1429 } 1430 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1431 net, abort_no_unlock, 1432 #if defined(__FreeBSD__) 1433 use_mflowid, mflowid, 1434 #endif 1435 vrf_id) < 0) { 1436 /* error in parsing parameters */ 1437 return (-1); 1438 } 1439 /* update our state */ 1440 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1441 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1442 1443 /* reset the RTO calc */ 1444 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1445 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1446 stcb->asoc.overall_error_count, 1447 0, 1448 SCTP_FROM_SCTP_INPUT, 1449 __LINE__); 1450 } 1451 stcb->asoc.overall_error_count = 0; 1452 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1453 /* 1454 * collapse the init timer back in case of a exponential 1455 * backoff 1456 */ 1457 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1458 stcb, net); 1459 /* 1460 * the send at the end of the inbound data processing will 1461 * cause the cookie to be sent 1462 */ 1463 break; 1464 case SCTP_STATE_SHUTDOWN_SENT: 1465 /* incorrect state... discard */ 1466 break; 1467 case SCTP_STATE_COOKIE_ECHOED: 1468 /* incorrect state... discard */ 1469 break; 1470 case SCTP_STATE_OPEN: 1471 /* incorrect state... discard */ 1472 break; 1473 case SCTP_STATE_EMPTY: 1474 case SCTP_STATE_INUSE: 1475 default: 1476 /* incorrect state... discard */ 1477 return (-1); 1478 break; 1479 } 1480 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1481 return (0); 1482 } 1483 1484 static struct sctp_tcb * 1485 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1486 struct sockaddr *src, struct sockaddr *dst, 1487 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1488 struct sctp_inpcb *inp, struct sctp_nets **netp, 1489 struct sockaddr *init_src, int *notification, 1490 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1491 #if defined(__FreeBSD__) 1492 uint8_t use_mflowid, uint32_t mflowid, 1493 #endif 1494 uint32_t vrf_id, uint16_t port); 1495 1496 1497 /* 1498 * handle a state cookie for an existing association m: input packet mbuf 1499 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1500 * "split" mbuf and the cookie signature does not exist offset: offset into 1501 * mbuf to the cookie-echo chunk 1502 */ 1503 static struct sctp_tcb * 1504 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1505 struct sockaddr *src, struct sockaddr *dst, 1506 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1507 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1508 struct sockaddr *init_src, int *notification, 1509 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1510 #if defined(__FreeBSD__) 1511 uint8_t use_mflowid, uint32_t mflowid, 1512 #endif 1513 uint32_t vrf_id, uint16_t port) 1514 { 1515 struct sctp_association *asoc; 1516 struct sctp_init_chunk *init_cp, init_buf; 1517 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1518 struct sctp_nets *net; 1519 struct mbuf *op_err; 1520 int init_offset, initack_offset, i; 1521 int retval; 1522 int spec_flag = 0; 1523 uint32_t how_indx; 1524 1525 net = *netp; 1526 /* I know that the TCB is non-NULL from the caller */ 1527 asoc = &stcb->asoc; 1528 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1529 if (asoc->cookie_how[how_indx] == 0) 1530 break; 1531 } 1532 if (how_indx < sizeof(asoc->cookie_how)) { 1533 asoc->cookie_how[how_indx] = 1; 1534 } 1535 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1536 /* SHUTDOWN came in after sending INIT-ACK */ 1537 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1538 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1539 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1540 #if defined(__FreeBSD__) 1541 use_mflowid, mflowid, 1542 #endif 1543 vrf_id, net->port); 1544 if (how_indx < sizeof(asoc->cookie_how)) 1545 asoc->cookie_how[how_indx] = 2; 1546 return (NULL); 1547 } 1548 /* 1549 * find and validate the INIT chunk in the cookie (peer's info) the 1550 * INIT should start after the cookie-echo header struct (chunk 1551 * header, state cookie header struct) 1552 */ 1553 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1554 1555 init_cp = (struct sctp_init_chunk *) 1556 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1557 (uint8_t *) & init_buf); 1558 if (init_cp == NULL) { 1559 /* could not pull a INIT chunk in cookie */ 1560 return (NULL); 1561 } 1562 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1563 return (NULL); 1564 } 1565 /* 1566 * find and validate the INIT-ACK chunk in the cookie (my info) the 1567 * INIT-ACK follows the INIT chunk 1568 */ 1569 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1570 initack_cp = (struct sctp_init_ack_chunk *) 1571 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1572 (uint8_t *) & initack_buf); 1573 if (initack_cp == NULL) { 1574 /* could not pull INIT-ACK chunk in cookie */ 1575 return (NULL); 1576 } 1577 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1578 return (NULL); 1579 } 1580 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1581 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1582 /* 1583 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1584 * to get into the OPEN state 1585 */ 1586 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1587 /*- 1588 * Opps, this means that we somehow generated two vtag's 1589 * the same. I.e. we did: 1590 * Us Peer 1591 * <---INIT(tag=a)------ 1592 * ----INIT-ACK(tag=t)--> 1593 * ----INIT(tag=t)------> *1 1594 * <---INIT-ACK(tag=a)--- 1595 * <----CE(tag=t)------------- *2 1596 * 1597 * At point *1 we should be generating a different 1598 * tag t'. Which means we would throw away the CE and send 1599 * ours instead. Basically this is case C (throw away side). 1600 */ 1601 if (how_indx < sizeof(asoc->cookie_how)) 1602 asoc->cookie_how[how_indx] = 17; 1603 return (NULL); 1604 1605 } 1606 switch (SCTP_GET_STATE(asoc)) { 1607 case SCTP_STATE_COOKIE_WAIT: 1608 case SCTP_STATE_COOKIE_ECHOED: 1609 /* 1610 * INIT was sent but got a COOKIE_ECHO with the 1611 * correct tags... just accept it...but we must 1612 * process the init so that we can make sure we 1613 * have the right seq no's. 1614 */ 1615 /* First we must process the INIT !! */ 1616 retval = sctp_process_init(init_cp, stcb); 1617 if (retval < 0) { 1618 if (how_indx < sizeof(asoc->cookie_how)) 1619 asoc->cookie_how[how_indx] = 3; 1620 return (NULL); 1621 } 1622 /* we have already processed the INIT so no problem */ 1623 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, 1624 net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_12); 1625 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_13); 1626 /* update current state */ 1627 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1628 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1629 else 1630 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1631 1632 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1633 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1634 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1635 stcb->sctp_ep, stcb, asoc->primary_destination); 1636 } 1637 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1638 sctp_stop_all_cookie_timers(stcb); 1639 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1640 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1641 (inp->sctp_socket->so_qlimit == 0) 1642 ) { 1643 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1644 struct socket *so; 1645 #endif 1646 /* 1647 * Here is where collision would go if we 1648 * did a connect() and instead got a 1649 * init/init-ack/cookie done before the 1650 * init-ack came back.. 1651 */ 1652 stcb->sctp_ep->sctp_flags |= 1653 SCTP_PCB_FLAGS_CONNECTED; 1654 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1655 so = SCTP_INP_SO(stcb->sctp_ep); 1656 atomic_add_int(&stcb->asoc.refcnt, 1); 1657 SCTP_TCB_UNLOCK(stcb); 1658 SCTP_SOCKET_LOCK(so, 1); 1659 SCTP_TCB_LOCK(stcb); 1660 atomic_add_int(&stcb->asoc.refcnt, -1); 1661 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1662 SCTP_SOCKET_UNLOCK(so, 1); 1663 return (NULL); 1664 } 1665 #endif 1666 soisconnected(stcb->sctp_socket); 1667 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1668 SCTP_SOCKET_UNLOCK(so, 1); 1669 #endif 1670 } 1671 /* notify upper layer */ 1672 *notification = SCTP_NOTIFY_ASSOC_UP; 1673 /* 1674 * since we did not send a HB make sure we 1675 * don't double things 1676 */ 1677 net->hb_responded = 1; 1678 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1679 &cookie->time_entered, 1680 sctp_align_unsafe_makecopy, 1681 SCTP_RTT_FROM_NON_DATA); 1682 1683 if (stcb->asoc.sctp_autoclose_ticks && 1684 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1685 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1686 inp, stcb, NULL); 1687 } 1688 break; 1689 default: 1690 /* 1691 * we're in the OPEN state (or beyond), so 1692 * peer must have simply lost the COOKIE-ACK 1693 */ 1694 break; 1695 } /* end switch */ 1696 sctp_stop_all_cookie_timers(stcb); 1697 /* 1698 * We ignore the return code here.. not sure if we should 1699 * somehow abort.. but we do have an existing asoc. This 1700 * really should not fail. 1701 */ 1702 if (sctp_load_addresses_from_init(stcb, m, 1703 init_offset + sizeof(struct sctp_init_chunk), 1704 initack_offset, src, dst, init_src)) { 1705 if (how_indx < sizeof(asoc->cookie_how)) 1706 asoc->cookie_how[how_indx] = 4; 1707 return (NULL); 1708 } 1709 /* respond with a COOKIE-ACK */ 1710 sctp_toss_old_cookies(stcb, asoc); 1711 sctp_send_cookie_ack(stcb); 1712 if (how_indx < sizeof(asoc->cookie_how)) 1713 asoc->cookie_how[how_indx] = 5; 1714 return (stcb); 1715 } 1716 1717 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1718 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1719 cookie->tie_tag_my_vtag == 0 && 1720 cookie->tie_tag_peer_vtag == 0) { 1721 /* 1722 * case C in Section 5.2.4 Table 2: XMOO silently discard 1723 */ 1724 if (how_indx < sizeof(asoc->cookie_how)) 1725 asoc->cookie_how[how_indx] = 6; 1726 return (NULL); 1727 } 1728 /* If nat support, and the below and stcb is established, 1729 * send back a ABORT(colliding state) if we are established. 1730 */ 1731 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1732 (asoc->peer_supports_nat) && 1733 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1734 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1735 (asoc->peer_vtag == 0)))) { 1736 /* Special case - Peer's support nat. We may have 1737 * two init's that we gave out the same tag on since 1738 * one was not established.. i.e. we get INIT from host-1 1739 * behind the nat and we respond tag-a, we get a INIT from 1740 * host-2 behind the nat and we get tag-a again. Then we 1741 * bring up host-1 (or 2's) assoc, Then comes the cookie 1742 * from hsot-2 (or 1). Now we have colliding state. We must 1743 * send an abort here with colliding state indication. 1744 */ 1745 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1746 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1747 #if defined(__FreeBSD__) 1748 use_mflowid, mflowid, 1749 #endif 1750 vrf_id, port); 1751 return (NULL); 1752 } 1753 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1754 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1755 (asoc->peer_vtag == 0))) { 1756 /* 1757 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1758 * should be ok, re-accept peer info 1759 */ 1760 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1761 /* Extension of case C. 1762 * If we hit this, then the random number 1763 * generator returned the same vtag when we 1764 * first sent our INIT-ACK and when we later sent 1765 * our INIT. The side with the seq numbers that are 1766 * different will be the one that normnally would 1767 * have hit case C. This in effect "extends" our vtags 1768 * in this collision case to be 64 bits. The same collision 1769 * could occur aka you get both vtag and seq number the 1770 * same twice in a row.. but is much less likely. If it 1771 * did happen then we would proceed through and bring 1772 * up the assoc.. we may end up with the wrong stream 1773 * setup however.. which would be bad.. but there is 1774 * no way to tell.. until we send on a stream that does 1775 * not exist :-) 1776 */ 1777 if (how_indx < sizeof(asoc->cookie_how)) 1778 asoc->cookie_how[how_indx] = 7; 1779 1780 return (NULL); 1781 } 1782 if (how_indx < sizeof(asoc->cookie_how)) 1783 asoc->cookie_how[how_indx] = 8; 1784 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_14); 1785 sctp_stop_all_cookie_timers(stcb); 1786 /* 1787 * since we did not send a HB make sure we don't double 1788 * things 1789 */ 1790 net->hb_responded = 1; 1791 if (stcb->asoc.sctp_autoclose_ticks && 1792 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1793 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1794 NULL); 1795 } 1796 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1797 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1798 1799 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1800 /* Ok the peer probably discarded our 1801 * data (if we echoed a cookie+data). So anything 1802 * on the sent_queue should be marked for 1803 * retransmit, we may not get something to 1804 * kick us so it COULD still take a timeout 1805 * to move these.. but it can't hurt to mark them. 1806 */ 1807 struct sctp_tmit_chunk *chk; 1808 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1809 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1810 chk->sent = SCTP_DATAGRAM_RESEND; 1811 sctp_flight_size_decrease(chk); 1812 sctp_total_flight_decrease(stcb, chk); 1813 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1814 spec_flag++; 1815 } 1816 } 1817 1818 } 1819 /* process the INIT info (peer's info) */ 1820 retval = sctp_process_init(init_cp, stcb); 1821 if (retval < 0) { 1822 if (how_indx < sizeof(asoc->cookie_how)) 1823 asoc->cookie_how[how_indx] = 9; 1824 return (NULL); 1825 } 1826 if (sctp_load_addresses_from_init(stcb, m, 1827 init_offset + sizeof(struct sctp_init_chunk), 1828 initack_offset, src, dst, init_src)) { 1829 if (how_indx < sizeof(asoc->cookie_how)) 1830 asoc->cookie_how[how_indx] = 10; 1831 return (NULL); 1832 } 1833 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1834 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1835 *notification = SCTP_NOTIFY_ASSOC_UP; 1836 1837 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1838 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1839 (inp->sctp_socket->so_qlimit == 0)) { 1840 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1841 struct socket *so; 1842 #endif 1843 stcb->sctp_ep->sctp_flags |= 1844 SCTP_PCB_FLAGS_CONNECTED; 1845 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1846 so = SCTP_INP_SO(stcb->sctp_ep); 1847 atomic_add_int(&stcb->asoc.refcnt, 1); 1848 SCTP_TCB_UNLOCK(stcb); 1849 SCTP_SOCKET_LOCK(so, 1); 1850 SCTP_TCB_LOCK(stcb); 1851 atomic_add_int(&stcb->asoc.refcnt, -1); 1852 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1853 SCTP_SOCKET_UNLOCK(so, 1); 1854 return (NULL); 1855 } 1856 #endif 1857 soisconnected(stcb->sctp_socket); 1858 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1859 SCTP_SOCKET_UNLOCK(so, 1); 1860 #endif 1861 } 1862 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1863 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1864 else 1865 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1866 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1867 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1868 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1869 } else { 1870 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1871 } 1872 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1873 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1874 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1875 stcb->sctp_ep, stcb, asoc->primary_destination); 1876 } 1877 sctp_stop_all_cookie_timers(stcb); 1878 sctp_toss_old_cookies(stcb, asoc); 1879 sctp_send_cookie_ack(stcb); 1880 if (spec_flag) { 1881 /* only if we have retrans set do we do this. What 1882 * this call does is get only the COOKIE-ACK out 1883 * and then when we return the normal call to 1884 * sctp_chunk_output will get the retrans out 1885 * behind this. 1886 */ 1887 sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1888 } 1889 if (how_indx < sizeof(asoc->cookie_how)) 1890 asoc->cookie_how[how_indx] = 11; 1891 1892 return (stcb); 1893 } 1894 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1895 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1896 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1897 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1898 cookie->tie_tag_peer_vtag != 0) { 1899 struct sctpasochead *head; 1900 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1901 struct socket *so; 1902 #endif 1903 1904 if (asoc->peer_supports_nat) { 1905 /* This is a gross gross hack. 1906 * Just call the cookie_new code since we 1907 * are allowing a duplicate association. 1908 * I hope this works... 1909 */ 1910 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1911 sh, cookie, cookie_len, 1912 inp, netp, init_src,notification, 1913 auth_skipped, auth_offset, auth_len, 1914 #if defined(__FreeBSD__) 1915 use_mflowid, mflowid, 1916 #endif 1917 vrf_id, port)); 1918 } 1919 /* 1920 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1921 */ 1922 /* temp code */ 1923 if (how_indx < sizeof(asoc->cookie_how)) 1924 asoc->cookie_how[how_indx] = 12; 1925 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_15); 1926 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16); 1927 1928 /* notify upper layer */ 1929 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1930 atomic_add_int(&stcb->asoc.refcnt, 1); 1931 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1932 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1933 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1934 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1935 } 1936 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1937 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1938 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1939 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1940 } 1941 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1942 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1943 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1944 stcb->sctp_ep, stcb, asoc->primary_destination); 1945 1946 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1947 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1948 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1949 } 1950 asoc->pre_open_streams = 1951 ntohs(initack_cp->init.num_outbound_streams); 1952 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1953 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1954 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1955 1956 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1957 1958 asoc->str_reset_seq_in = asoc->init_seq_number; 1959 1960 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1961 if (asoc->mapping_array) { 1962 memset(asoc->mapping_array, 0, 1963 asoc->mapping_array_size); 1964 } 1965 if (asoc->nr_mapping_array) { 1966 memset(asoc->nr_mapping_array, 0, 1967 asoc->mapping_array_size); 1968 } 1969 SCTP_TCB_UNLOCK(stcb); 1970 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1971 so = SCTP_INP_SO(stcb->sctp_ep); 1972 SCTP_SOCKET_LOCK(so, 1); 1973 #endif 1974 SCTP_INP_INFO_WLOCK(); 1975 SCTP_INP_WLOCK(stcb->sctp_ep); 1976 SCTP_TCB_LOCK(stcb); 1977 atomic_add_int(&stcb->asoc.refcnt, -1); 1978 /* send up all the data */ 1979 SCTP_TCB_SEND_LOCK(stcb); 1980 1981 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1982 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1983 stcb->asoc.strmout[i].chunks_on_queues = 0; 1984 stcb->asoc.strmout[i].stream_no = i; 1985 stcb->asoc.strmout[i].next_sequence_send = 0; 1986 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1987 } 1988 /* process the INIT-ACK info (my info) */ 1989 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1990 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1991 1992 /* pull from vtag hash */ 1993 LIST_REMOVE(stcb, sctp_asocs); 1994 /* re-insert to new vtag position */ 1995 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1996 SCTP_BASE_INFO(hashasocmark))]; 1997 /* 1998 * put it in the bucket in the vtag hash of assoc's for the 1999 * system 2000 */ 2001 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2002 2003 SCTP_TCB_SEND_UNLOCK(stcb); 2004 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2005 SCTP_INP_INFO_WUNLOCK(); 2006 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2007 SCTP_SOCKET_UNLOCK(so, 1); 2008 #endif 2009 asoc->total_flight = 0; 2010 asoc->total_flight_count = 0; 2011 /* process the INIT info (peer's info) */ 2012 retval = sctp_process_init(init_cp, stcb); 2013 if (retval < 0) { 2014 if (how_indx < sizeof(asoc->cookie_how)) 2015 asoc->cookie_how[how_indx] = 13; 2016 2017 return (NULL); 2018 } 2019 /* 2020 * since we did not send a HB make sure we don't double 2021 * things 2022 */ 2023 net->hb_responded = 1; 2024 2025 if (sctp_load_addresses_from_init(stcb, m, 2026 init_offset + sizeof(struct sctp_init_chunk), 2027 initack_offset, src, dst, init_src)) { 2028 if (how_indx < sizeof(asoc->cookie_how)) 2029 asoc->cookie_how[how_indx] = 14; 2030 2031 return (NULL); 2032 } 2033 /* respond with a COOKIE-ACK */ 2034 sctp_stop_all_cookie_timers(stcb); 2035 sctp_toss_old_cookies(stcb, asoc); 2036 sctp_send_cookie_ack(stcb); 2037 if (how_indx < sizeof(asoc->cookie_how)) 2038 asoc->cookie_how[how_indx] = 15; 2039 2040 return (stcb); 2041 } 2042 if (how_indx < sizeof(asoc->cookie_how)) 2043 asoc->cookie_how[how_indx] = 16; 2044 /* all other cases... */ 2045 return (NULL); 2046 } 2047 2048 2049 /* 2050 * handle a state cookie for a new association m: input packet mbuf chain-- 2051 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2052 * and the cookie signature does not exist offset: offset into mbuf to the 2053 * cookie-echo chunk length: length of the cookie chunk to: where the init 2054 * was from returns a new TCB 2055 */ 2056 static struct sctp_tcb * 2057 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2058 struct sockaddr *src, struct sockaddr *dst, 2059 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2060 struct sctp_inpcb *inp, struct sctp_nets **netp, 2061 struct sockaddr *init_src, int *notification, 2062 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2063 #if defined(__FreeBSD__) 2064 uint8_t use_mflowid, uint32_t mflowid, 2065 #endif 2066 uint32_t vrf_id, uint16_t port) 2067 { 2068 struct sctp_tcb *stcb; 2069 struct sctp_init_chunk *init_cp, init_buf; 2070 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2071 struct sockaddr_storage sa_store; 2072 struct sockaddr *initack_src = (struct sockaddr *)&sa_store; 2073 struct sctp_association *asoc; 2074 int init_offset, initack_offset, initack_limit; 2075 int retval; 2076 int error = 0; 2077 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2078 #ifdef INET 2079 struct sockaddr_in *sin; 2080 #endif 2081 #ifdef INET6 2082 struct sockaddr_in6 *sin6; 2083 #endif 2084 #if defined(__Userspace__) 2085 struct sockaddr_conn *sconn; 2086 #endif 2087 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2088 struct socket *so; 2089 2090 so = SCTP_INP_SO(inp); 2091 #endif 2092 2093 /* 2094 * find and validate the INIT chunk in the cookie (peer's info) the 2095 * INIT should start after the cookie-echo header struct (chunk 2096 * header, state cookie header struct) 2097 */ 2098 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2099 init_cp = (struct sctp_init_chunk *) 2100 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2101 (uint8_t *) & init_buf); 2102 if (init_cp == NULL) { 2103 /* could not pull a INIT chunk in cookie */ 2104 SCTPDBG(SCTP_DEBUG_INPUT1, 2105 "process_cookie_new: could not pull INIT chunk hdr\n"); 2106 return (NULL); 2107 } 2108 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2109 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2110 return (NULL); 2111 } 2112 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2113 /* 2114 * find and validate the INIT-ACK chunk in the cookie (my info) the 2115 * INIT-ACK follows the INIT chunk 2116 */ 2117 initack_cp = (struct sctp_init_ack_chunk *) 2118 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2119 (uint8_t *) & initack_buf); 2120 if (initack_cp == NULL) { 2121 /* could not pull INIT-ACK chunk in cookie */ 2122 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2123 return (NULL); 2124 } 2125 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2126 return (NULL); 2127 } 2128 /* 2129 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2130 * "initack_limit" value. This is because the chk_length field 2131 * includes the length of the cookie, but the cookie is omitted when 2132 * the INIT and INIT_ACK are tacked onto the cookie... 2133 */ 2134 initack_limit = offset + cookie_len; 2135 2136 /* 2137 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2138 * and popluate 2139 */ 2140 2141 /* 2142 * Here we do a trick, we set in NULL for the proc/thread argument. We 2143 * do this since in effect we only use the p argument when 2144 * the socket is unbound and we must do an implicit bind. 2145 * Since we are getting a cookie, we cannot be unbound. 2146 */ 2147 stcb = sctp_aloc_assoc(inp, init_src, &error, 2148 ntohl(initack_cp->init.initiate_tag), vrf_id, 2149 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000 2150 (struct thread *)NULL 2151 #elif defined(__Windows__) 2152 (PKTHREAD)NULL 2153 #else 2154 (struct proc *)NULL 2155 #endif 2156 ); 2157 if (stcb == NULL) { 2158 struct mbuf *op_err; 2159 2160 /* memory problem? */ 2161 SCTPDBG(SCTP_DEBUG_INPUT1, 2162 "process_cookie_new: no room for another TCB!\n"); 2163 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2164 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2165 src, dst, sh, op_err, 2166 #if defined(__FreeBSD__) 2167 use_mflowid, mflowid, 2168 #endif 2169 vrf_id, port); 2170 return (NULL); 2171 } 2172 /* get the correct sctp_nets */ 2173 if (netp) 2174 *netp = sctp_findnet(stcb, init_src); 2175 2176 asoc = &stcb->asoc; 2177 /* get scope variables out of cookie */ 2178 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2179 asoc->scope.site_scope = cookie->site_scope; 2180 asoc->scope.local_scope = cookie->local_scope; 2181 asoc->scope.loopback_scope = cookie->loopback_scope; 2182 2183 #if defined(__Userspace__) 2184 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2185 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) || 2186 (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) { 2187 #else 2188 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2189 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2190 #endif 2191 struct mbuf *op_err; 2192 2193 /* 2194 * Houston we have a problem. The EP changed while the 2195 * cookie was in flight. Only recourse is to abort the 2196 * association. 2197 */ 2198 atomic_add_int(&stcb->asoc.refcnt, 1); 2199 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2200 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2201 src, dst, sh, op_err, 2202 #if defined(__FreeBSD__) 2203 use_mflowid, mflowid, 2204 #endif 2205 vrf_id, port); 2206 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2207 SCTP_TCB_UNLOCK(stcb); 2208 SCTP_SOCKET_LOCK(so, 1); 2209 SCTP_TCB_LOCK(stcb); 2210 #endif 2211 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2212 SCTP_FROM_SCTP_INPUT+SCTP_LOC_16); 2213 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2214 SCTP_SOCKET_UNLOCK(so, 1); 2215 #endif 2216 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2217 return (NULL); 2218 } 2219 /* process the INIT-ACK info (my info) */ 2220 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2221 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2222 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2223 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2224 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2225 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2226 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2227 asoc->str_reset_seq_in = asoc->init_seq_number; 2228 2229 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2230 2231 /* process the INIT info (peer's info) */ 2232 if (netp) 2233 retval = sctp_process_init(init_cp, stcb); 2234 else 2235 retval = 0; 2236 if (retval < 0) { 2237 atomic_add_int(&stcb->asoc.refcnt, 1); 2238 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2239 SCTP_TCB_UNLOCK(stcb); 2240 SCTP_SOCKET_LOCK(so, 1); 2241 SCTP_TCB_LOCK(stcb); 2242 #endif 2243 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_16); 2244 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2245 SCTP_SOCKET_UNLOCK(so, 1); 2246 #endif 2247 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2248 return (NULL); 2249 } 2250 /* load all addresses */ 2251 if (sctp_load_addresses_from_init(stcb, m, 2252 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2253 src, dst, init_src)) { 2254 atomic_add_int(&stcb->asoc.refcnt, 1); 2255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2256 SCTP_TCB_UNLOCK(stcb); 2257 SCTP_SOCKET_LOCK(so, 1); 2258 SCTP_TCB_LOCK(stcb); 2259 #endif 2260 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_17); 2261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2262 SCTP_SOCKET_UNLOCK(so, 1); 2263 #endif 2264 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2265 return (NULL); 2266 } 2267 /* 2268 * verify any preceding AUTH chunk that was skipped 2269 */ 2270 /* pull the local authentication parameters from the cookie/init-ack */ 2271 sctp_auth_get_cookie_params(stcb, m, 2272 initack_offset + sizeof(struct sctp_init_ack_chunk), 2273 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2274 if (auth_skipped) { 2275 struct sctp_auth_chunk *auth; 2276 2277 auth = (struct sctp_auth_chunk *) 2278 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2279 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2280 /* auth HMAC failed, dump the assoc and packet */ 2281 SCTPDBG(SCTP_DEBUG_AUTH1, 2282 "COOKIE-ECHO: AUTH failed\n"); 2283 atomic_add_int(&stcb->asoc.refcnt, 1); 2284 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2285 SCTP_TCB_UNLOCK(stcb); 2286 SCTP_SOCKET_LOCK(so, 1); 2287 SCTP_TCB_LOCK(stcb); 2288 #endif 2289 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_18); 2290 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2291 SCTP_SOCKET_UNLOCK(so, 1); 2292 #endif 2293 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2294 return (NULL); 2295 } else { 2296 /* remaining chunks checked... good to go */ 2297 stcb->asoc.authenticated = 1; 2298 } 2299 } 2300 /* update current state */ 2301 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2302 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2303 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2304 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2305 stcb->sctp_ep, stcb, asoc->primary_destination); 2306 } 2307 sctp_stop_all_cookie_timers(stcb); 2308 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2309 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2310 2311 /* 2312 * if we're doing ASCONFs, check to see if we have any new local 2313 * addresses that need to get added to the peer (eg. addresses 2314 * changed while cookie echo in flight). This needs to be done 2315 * after we go to the OPEN state to do the correct asconf 2316 * processing. else, make sure we have the correct addresses in our 2317 * lists 2318 */ 2319 2320 /* warning, we re-use sin, sin6, sa_store here! */ 2321 /* pull in local_address (our "from" address) */ 2322 switch (cookie->laddr_type) { 2323 #ifdef INET 2324 case SCTP_IPV4_ADDRESS: 2325 /* source addr is IPv4 */ 2326 sin = (struct sockaddr_in *)initack_src; 2327 memset(sin, 0, sizeof(*sin)); 2328 sin->sin_family = AF_INET; 2329 #ifdef HAVE_SIN_LEN 2330 sin->sin_len = sizeof(struct sockaddr_in); 2331 #endif 2332 sin->sin_addr.s_addr = cookie->laddress[0]; 2333 break; 2334 #endif 2335 #ifdef INET6 2336 case SCTP_IPV6_ADDRESS: 2337 /* source addr is IPv6 */ 2338 sin6 = (struct sockaddr_in6 *)initack_src; 2339 memset(sin6, 0, sizeof(*sin6)); 2340 sin6->sin6_family = AF_INET6; 2341 #ifdef HAVE_SIN6_LEN 2342 sin6->sin6_len = sizeof(struct sockaddr_in6); 2343 #endif 2344 sin6->sin6_scope_id = cookie->scope_id; 2345 memcpy(&sin6->sin6_addr, cookie->laddress, 2346 sizeof(sin6->sin6_addr)); 2347 break; 2348 #endif 2349 #if defined(__Userspace__) 2350 case SCTP_CONN_ADDRESS: 2351 /* source addr is IPv4 */ 2352 sconn = (struct sockaddr_conn *)initack_src; 2353 memset(sconn, 0, sizeof(struct sockaddr_conn)); 2354 sconn->sconn_family = AF_CONN; 2355 #ifdef HAVE_SCONN_LEN 2356 sconn->sconn_len = sizeof(struct sockaddr_conn); 2357 #endif 2358 memcpy(&sconn->sconn_addr, cookie->laddress, sizeof(void *)); 2359 break; 2360 #endif 2361 default: 2362 atomic_add_int(&stcb->asoc.refcnt, 1); 2363 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2364 SCTP_TCB_UNLOCK(stcb); 2365 SCTP_SOCKET_LOCK(so, 1); 2366 SCTP_TCB_LOCK(stcb); 2367 #endif 2368 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_19); 2369 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2370 SCTP_SOCKET_UNLOCK(so, 1); 2371 #endif 2372 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2373 return (NULL); 2374 } 2375 2376 /* set up to notify upper layer */ 2377 *notification = SCTP_NOTIFY_ASSOC_UP; 2378 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2379 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2380 (inp->sctp_socket->so_qlimit == 0)) { 2381 /* 2382 * This is an endpoint that called connect() how it got a 2383 * cookie that is NEW is a bit of a mystery. It must be that 2384 * the INIT was sent, but before it got there.. a complete 2385 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2386 * should have went to the other code.. not here.. oh well.. 2387 * a bit of protection is worth having.. 2388 */ 2389 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2390 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2391 atomic_add_int(&stcb->asoc.refcnt, 1); 2392 SCTP_TCB_UNLOCK(stcb); 2393 SCTP_SOCKET_LOCK(so, 1); 2394 SCTP_TCB_LOCK(stcb); 2395 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2396 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2397 SCTP_SOCKET_UNLOCK(so, 1); 2398 return (NULL); 2399 } 2400 #endif 2401 soisconnected(stcb->sctp_socket); 2402 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2403 SCTP_SOCKET_UNLOCK(so, 1); 2404 #endif 2405 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2406 (inp->sctp_socket->so_qlimit)) { 2407 /* 2408 * We don't want to do anything with this one. Since it is 2409 * the listening guy. The timer will get started for 2410 * accepted connections in the caller. 2411 */ 2412 ; 2413 } 2414 /* since we did not send a HB make sure we don't double things */ 2415 if ((netp) && (*netp)) 2416 (*netp)->hb_responded = 1; 2417 2418 if (stcb->asoc.sctp_autoclose_ticks && 2419 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2420 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2421 } 2422 /* calculate the RTT */ 2423 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2424 if ((netp) && (*netp)) { 2425 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2426 &cookie->time_entered, sctp_align_unsafe_makecopy, 2427 SCTP_RTT_FROM_NON_DATA); 2428 } 2429 /* respond with a COOKIE-ACK */ 2430 sctp_send_cookie_ack(stcb); 2431 2432 /* 2433 * check the address lists for any ASCONFs that need to be sent 2434 * AFTER the cookie-ack is sent 2435 */ 2436 sctp_check_address_list(stcb, m, 2437 initack_offset + sizeof(struct sctp_init_ack_chunk), 2438 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2439 initack_src, cookie->local_scope, cookie->site_scope, 2440 cookie->ipv4_scope, cookie->loopback_scope); 2441 2442 2443 return (stcb); 2444 } 2445 2446 /* 2447 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2448 * we NEED to make sure we are not already using the vtag. If so we 2449 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2450 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2451 SCTP_BASE_INFO(hashasocmark))]; 2452 LIST_FOREACH(stcb, head, sctp_asocs) { 2453 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2454 -- SEND ABORT - TRY AGAIN -- 2455 } 2456 } 2457 */ 2458 2459 /* 2460 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2461 * existing (non-NULL) TCB 2462 */ 2463 static struct mbuf * 2464 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2465 struct sockaddr *src, struct sockaddr *dst, 2466 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2467 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2468 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2469 struct sctp_tcb **locked_tcb, 2470 #if defined(__FreeBSD__) 2471 uint8_t use_mflowid, uint32_t mflowid, 2472 #endif 2473 uint32_t vrf_id, uint16_t port) 2474 { 2475 struct sctp_state_cookie *cookie; 2476 struct sctp_tcb *l_stcb = *stcb; 2477 struct sctp_inpcb *l_inp; 2478 struct sockaddr *to; 2479 struct sctp_pcb *ep; 2480 struct mbuf *m_sig; 2481 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2482 uint8_t *sig; 2483 uint8_t cookie_ok = 0; 2484 unsigned int sig_offset, cookie_offset; 2485 unsigned int cookie_len; 2486 struct timeval now; 2487 struct timeval time_expires; 2488 int notification = 0; 2489 struct sctp_nets *netl; 2490 int had_a_existing_tcb = 0; 2491 int send_int_conf = 0; 2492 #ifdef INET 2493 struct sockaddr_in sin; 2494 #endif 2495 #ifdef INET6 2496 struct sockaddr_in6 sin6; 2497 #endif 2498 #if defined(__Userspace__) 2499 struct sockaddr_conn sconn; 2500 #endif 2501 2502 SCTPDBG(SCTP_DEBUG_INPUT2, 2503 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2504 2505 if (inp_p == NULL) { 2506 return (NULL); 2507 } 2508 cookie = &cp->cookie; 2509 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2510 cookie_len = ntohs(cp->ch.chunk_length); 2511 2512 if ((cookie->peerport != sh->src_port) && 2513 (cookie->myport != sh->dest_port) && 2514 (cookie->my_vtag != sh->v_tag)) { 2515 /* 2516 * invalid ports or bad tag. Note that we always leave the 2517 * v_tag in the header in network order and when we stored 2518 * it in the my_vtag slot we also left it in network order. 2519 * This maintains the match even though it may be in the 2520 * opposite byte order of the machine :-> 2521 */ 2522 return (NULL); 2523 } 2524 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2525 sizeof(struct sctp_init_chunk) + 2526 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2527 /* cookie too small */ 2528 return (NULL); 2529 } 2530 /* 2531 * split off the signature into its own mbuf (since it should not be 2532 * calculated in the sctp_hmac_m() call). 2533 */ 2534 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2535 m_sig = m_split(m, sig_offset, M_NOWAIT); 2536 if (m_sig == NULL) { 2537 /* out of memory or ?? */ 2538 return (NULL); 2539 } 2540 #ifdef SCTP_MBUF_LOGGING 2541 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2542 struct mbuf *mat; 2543 2544 for (mat = m_sig; mat; mat = SCTP_BUF_NEXT(mat)) { 2545 if (SCTP_BUF_IS_EXTENDED(mat)) { 2546 sctp_log_mb(mat, SCTP_MBUF_SPLIT); 2547 } 2548 } 2549 } 2550 #endif 2551 2552 /* 2553 * compute the signature/digest for the cookie 2554 */ 2555 ep = &(*inp_p)->sctp_ep; 2556 l_inp = *inp_p; 2557 if (l_stcb) { 2558 SCTP_TCB_UNLOCK(l_stcb); 2559 } 2560 SCTP_INP_RLOCK(l_inp); 2561 if (l_stcb) { 2562 SCTP_TCB_LOCK(l_stcb); 2563 } 2564 /* which cookie is it? */ 2565 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2566 (ep->current_secret_number != ep->last_secret_number)) { 2567 /* it's the old cookie */ 2568 (void)sctp_hmac_m(SCTP_HMAC, 2569 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2570 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2571 } else { 2572 /* it's the current cookie */ 2573 (void)sctp_hmac_m(SCTP_HMAC, 2574 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2575 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2576 } 2577 /* get the signature */ 2578 SCTP_INP_RUNLOCK(l_inp); 2579 sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig); 2580 if (sig == NULL) { 2581 /* couldn't find signature */ 2582 sctp_m_freem(m_sig); 2583 return (NULL); 2584 } 2585 /* compare the received digest with the computed digest */ 2586 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2587 /* try the old cookie? */ 2588 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2589 (ep->current_secret_number != ep->last_secret_number)) { 2590 /* compute digest with old */ 2591 (void)sctp_hmac_m(SCTP_HMAC, 2592 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2593 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2594 /* compare */ 2595 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2596 cookie_ok = 1; 2597 } 2598 } else { 2599 cookie_ok = 1; 2600 } 2601 2602 /* 2603 * Now before we continue we must reconstruct our mbuf so that 2604 * normal processing of any other chunks will work. 2605 */ 2606 { 2607 struct mbuf *m_at; 2608 2609 m_at = m; 2610 while (SCTP_BUF_NEXT(m_at) != NULL) { 2611 m_at = SCTP_BUF_NEXT(m_at); 2612 } 2613 SCTP_BUF_NEXT(m_at) = m_sig; 2614 } 2615 2616 if (cookie_ok == 0) { 2617 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2618 SCTPDBG(SCTP_DEBUG_INPUT2, 2619 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2620 (uint32_t) offset, cookie_offset, sig_offset); 2621 return (NULL); 2622 } 2623 2624 /* 2625 * check the cookie timestamps to be sure it's not stale 2626 */ 2627 (void)SCTP_GETTIME_TIMEVAL(&now); 2628 /* Expire time is in Ticks, so we convert to seconds */ 2629 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2630 time_expires.tv_usec = cookie->time_entered.tv_usec; 2631 /* TODO sctp_constants.h needs alternative time macros when 2632 * _KERNEL is undefined. 2633 */ 2634 #ifndef __FreeBSD__ 2635 if (timercmp(&now, &time_expires, >)) 2636 #else 2637 if (timevalcmp(&now, &time_expires, >)) 2638 #endif 2639 { 2640 /* cookie is stale! */ 2641 struct mbuf *op_err; 2642 struct sctp_stale_cookie_msg *scm; 2643 uint32_t tim; 2644 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_stale_cookie_msg), 2645 0, M_NOWAIT, 1, MT_DATA); 2646 if (op_err == NULL) { 2647 /* FOOBAR */ 2648 return (NULL); 2649 } 2650 /* Set the len */ 2651 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_stale_cookie_msg); 2652 scm = mtod(op_err, struct sctp_stale_cookie_msg *); 2653 scm->ph.param_type = htons(SCTP_CAUSE_STALE_COOKIE); 2654 scm->ph.param_length = htons((sizeof(struct sctp_paramhdr) + 2655 (sizeof(uint32_t)))); 2656 /* seconds to usec */ 2657 tim = (now.tv_sec - time_expires.tv_sec) * 1000000; 2658 /* add in usec */ 2659 if (tim == 0) 2660 tim = now.tv_usec - cookie->time_entered.tv_usec; 2661 scm->time_usec = htonl(tim); 2662 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2663 #if defined(__FreeBSD__) 2664 use_mflowid, mflowid, 2665 #endif 2666 vrf_id, port); 2667 return (NULL); 2668 } 2669 /* 2670 * Now we must see with the lookup address if we have an existing 2671 * asoc. This will only happen if we were in the COOKIE-WAIT state 2672 * and a INIT collided with us and somewhere the peer sent the 2673 * cookie on another address besides the single address our assoc 2674 * had for him. In this case we will have one of the tie-tags set at 2675 * least AND the address field in the cookie can be used to look it 2676 * up. 2677 */ 2678 to = NULL; 2679 switch (cookie->addr_type) { 2680 #ifdef INET6 2681 case SCTP_IPV6_ADDRESS: 2682 memset(&sin6, 0, sizeof(sin6)); 2683 sin6.sin6_family = AF_INET6; 2684 #ifdef HAVE_SIN6_LEN 2685 sin6.sin6_len = sizeof(sin6); 2686 #endif 2687 sin6.sin6_port = sh->src_port; 2688 sin6.sin6_scope_id = cookie->scope_id; 2689 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2690 sizeof(sin6.sin6_addr.s6_addr)); 2691 to = (struct sockaddr *)&sin6; 2692 break; 2693 #endif 2694 #ifdef INET 2695 case SCTP_IPV4_ADDRESS: 2696 memset(&sin, 0, sizeof(sin)); 2697 sin.sin_family = AF_INET; 2698 #ifdef HAVE_SIN_LEN 2699 sin.sin_len = sizeof(sin); 2700 #endif 2701 sin.sin_port = sh->src_port; 2702 sin.sin_addr.s_addr = cookie->address[0]; 2703 to = (struct sockaddr *)&sin; 2704 break; 2705 #endif 2706 #if defined(__Userspace__) 2707 case SCTP_CONN_ADDRESS: 2708 memset(&sconn, 0, sizeof(struct sockaddr_conn)); 2709 sconn.sconn_family = AF_CONN; 2710 #ifdef HAVE_SCONN_LEN 2711 sconn.sconn_len = sizeof(struct sockaddr_conn); 2712 #endif 2713 sconn.sconn_port = sh->src_port; 2714 memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *)); 2715 to = (struct sockaddr *)&sconn; 2716 break; 2717 #endif 2718 default: 2719 /* This should not happen */ 2720 return (NULL); 2721 } 2722 if ((*stcb == NULL) && to) { 2723 /* Yep, lets check */ 2724 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2725 if (*stcb == NULL) { 2726 /* 2727 * We should have only got back the same inp. If we 2728 * got back a different ep we have a problem. The 2729 * original findep got back l_inp and now 2730 */ 2731 if (l_inp != *inp_p) { 2732 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2733 } 2734 } else { 2735 if (*locked_tcb == NULL) { 2736 /* In this case we found the assoc only 2737 * after we locked the create lock. This means 2738 * we are in a colliding case and we must make 2739 * sure that we unlock the tcb if its one of the 2740 * cases where we throw away the incoming packets. 2741 */ 2742 *locked_tcb = *stcb; 2743 2744 /* We must also increment the inp ref count 2745 * since the ref_count flags was set when we 2746 * did not find the TCB, now we found it which 2747 * reduces the refcount.. we must raise it back 2748 * out to balance it all :-) 2749 */ 2750 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2751 if ((*stcb)->sctp_ep != l_inp) { 2752 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2753 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2754 } 2755 } 2756 } 2757 } 2758 if (to == NULL) { 2759 return (NULL); 2760 } 2761 2762 cookie_len -= SCTP_SIGNATURE_SIZE; 2763 if (*stcb == NULL) { 2764 /* this is the "normal" case... get a new TCB */ 2765 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2766 cookie, cookie_len, *inp_p, 2767 netp, to, ¬ification, 2768 auth_skipped, auth_offset, auth_len, 2769 #if defined(__FreeBSD__) 2770 use_mflowid, mflowid, 2771 #endif 2772 vrf_id, port); 2773 } else { 2774 /* this is abnormal... cookie-echo on existing TCB */ 2775 had_a_existing_tcb = 1; 2776 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2777 src, dst, sh, 2778 cookie, cookie_len, *inp_p, *stcb, netp, to, 2779 ¬ification, auth_skipped, auth_offset, auth_len, 2780 #if defined(__FreeBSD__) 2781 use_mflowid, mflowid, 2782 #endif 2783 vrf_id, port); 2784 } 2785 2786 if (*stcb == NULL) { 2787 /* still no TCB... must be bad cookie-echo */ 2788 return (NULL); 2789 } 2790 #if defined(__FreeBSD__) 2791 if ((*netp != NULL) && (use_mflowid != 0)) { 2792 (*netp)->flowid = mflowid; 2793 #ifdef INVARIANTS 2794 (*netp)->flowidset = 1; 2795 #endif 2796 } 2797 #endif 2798 /* 2799 * Ok, we built an association so confirm the address we sent the 2800 * INIT-ACK to. 2801 */ 2802 netl = sctp_findnet(*stcb, to); 2803 /* 2804 * This code should in theory NOT run but 2805 */ 2806 if (netl == NULL) { 2807 /* TSNH! Huh, why do I need to add this address here? */ 2808 if (sctp_add_remote_addr(*stcb, to, NULL, SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2809 return (NULL); 2810 } 2811 netl = sctp_findnet(*stcb, to); 2812 } 2813 if (netl) { 2814 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2815 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2816 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2817 netl); 2818 send_int_conf = 1; 2819 } 2820 } 2821 sctp_start_net_timers(*stcb); 2822 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2823 if (!had_a_existing_tcb || 2824 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2825 /* 2826 * If we have a NEW cookie or the connect never 2827 * reached the connected state during collision we 2828 * must do the TCP accept thing. 2829 */ 2830 struct socket *so, *oso; 2831 struct sctp_inpcb *inp; 2832 2833 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2834 /* 2835 * For a restart we will keep the same 2836 * socket, no need to do anything. I THINK!! 2837 */ 2838 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2839 if (send_int_conf) { 2840 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2841 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2842 } 2843 return (m); 2844 } 2845 oso = (*inp_p)->sctp_socket; 2846 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000) 2847 /* 2848 * We do this to keep the sockets side happy during 2849 * the sonewcon ONLY. 2850 */ 2851 NET_LOCK_GIANT(); 2852 #endif 2853 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2854 SCTP_TCB_UNLOCK((*stcb)); 2855 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000 2856 CURVNET_SET(oso->so_vnet); 2857 #endif 2858 #if defined(__APPLE__) 2859 SCTP_SOCKET_LOCK(oso, 1); 2860 #endif 2861 so = sonewconn(oso, 0 2862 #if defined(__APPLE__) 2863 ,NULL 2864 #endif 2865 #ifdef __Panda__ 2866 ,NULL , (*inp_p)->def_vrf_id 2867 #endif 2868 ); 2869 #if (defined(__FreeBSD__) && __FreeBSD_version < 700000) 2870 NET_UNLOCK_GIANT(); 2871 #endif 2872 #if defined(__APPLE__) 2873 SCTP_SOCKET_UNLOCK(oso, 1); 2874 #endif 2875 #if defined(__FreeBSD__) && __FreeBSD_version >= 801000 2876 CURVNET_RESTORE(); 2877 #endif 2878 SCTP_TCB_LOCK((*stcb)); 2879 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2880 2881 if (so == NULL) { 2882 struct mbuf *op_err; 2883 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2884 struct socket *pcb_so; 2885 #endif 2886 /* Too many sockets */ 2887 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2888 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2889 sctp_abort_association(*inp_p, NULL, m, iphlen, 2890 src, dst, sh, op_err, 2891 #if defined(__FreeBSD__) 2892 use_mflowid, mflowid, 2893 #endif 2894 vrf_id, port); 2895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2896 pcb_so = SCTP_INP_SO(*inp_p); 2897 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2898 SCTP_TCB_UNLOCK((*stcb)); 2899 SCTP_SOCKET_LOCK(pcb_so, 1); 2900 SCTP_TCB_LOCK((*stcb)); 2901 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2902 #endif 2903 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_20); 2904 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2905 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2906 #endif 2907 return (NULL); 2908 } 2909 inp = (struct sctp_inpcb *)so->so_pcb; 2910 SCTP_INP_INCR_REF(inp); 2911 /* 2912 * We add the unbound flag here so that 2913 * if we get an soabort() before we get the 2914 * move_pcb done, we will properly cleanup. 2915 */ 2916 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2917 SCTP_PCB_FLAGS_CONNECTED | 2918 SCTP_PCB_FLAGS_IN_TCPPOOL | 2919 SCTP_PCB_FLAGS_UNBOUND | 2920 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2921 SCTP_PCB_FLAGS_DONT_WAKE); 2922 inp->sctp_features = (*inp_p)->sctp_features; 2923 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2924 inp->sctp_socket = so; 2925 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2926 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2927 inp->sctp_ecn_enable = (*inp_p)->sctp_ecn_enable; 2928 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2929 inp->sctp_context = (*inp_p)->sctp_context; 2930 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2931 inp->inp_starting_point_for_iterator = NULL; 2932 #if defined(__Userspace__) 2933 inp->ulp_info = (*inp_p)->ulp_info; 2934 inp->recv_callback = (*inp_p)->recv_callback; 2935 inp->send_callback = (*inp_p)->send_callback; 2936 inp->send_sb_threshold = (*inp_p)->send_sb_threshold; 2937 #endif 2938 /* 2939 * copy in the authentication parameters from the 2940 * original endpoint 2941 */ 2942 if (inp->sctp_ep.local_hmacs) 2943 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2944 inp->sctp_ep.local_hmacs = 2945 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2946 if (inp->sctp_ep.local_auth_chunks) 2947 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2948 inp->sctp_ep.local_auth_chunks = 2949 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2950 2951 /* 2952 * Now we must move it from one hash table to 2953 * another and get the tcb in the right place. 2954 */ 2955 2956 /* This is where the one-2-one socket is put into 2957 * the accept state waiting for the accept! 2958 */ 2959 if (*stcb) { 2960 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2961 } 2962 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2963 2964 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2965 SCTP_TCB_UNLOCK((*stcb)); 2966 2967 #if defined(__FreeBSD__) 2968 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2969 0); 2970 #else 2971 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT); 2972 #endif 2973 SCTP_TCB_LOCK((*stcb)); 2974 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2975 2976 2977 /* now we must check to see if we were aborted while 2978 * the move was going on and the lock/unlock happened. 2979 */ 2980 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2981 /* yep it was, we leave the 2982 * assoc attached to the socket since 2983 * the sctp_inpcb_free() call will send 2984 * an abort for us. 2985 */ 2986 SCTP_INP_DECR_REF(inp); 2987 return (NULL); 2988 } 2989 SCTP_INP_DECR_REF(inp); 2990 /* Switch over to the new guy */ 2991 *inp_p = inp; 2992 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2993 if (send_int_conf) { 2994 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2995 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2996 } 2997 2998 /* Pull it from the incomplete queue and wake the guy */ 2999 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3000 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 3001 SCTP_TCB_UNLOCK((*stcb)); 3002 SCTP_SOCKET_LOCK(so, 1); 3003 #endif 3004 soisconnected(so); 3005 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3006 SCTP_TCB_LOCK((*stcb)); 3007 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 3008 SCTP_SOCKET_UNLOCK(so, 1); 3009 #endif 3010 return (m); 3011 } 3012 } 3013 if (notification) { 3014 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3015 } 3016 if (send_int_conf) { 3017 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 3018 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 3019 } 3020 return (m); 3021 } 3022 3023 static void 3024 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 3025 struct sctp_tcb *stcb, struct sctp_nets *net) 3026 { 3027 /* cp must not be used, others call this without a c-ack :-) */ 3028 struct sctp_association *asoc; 3029 3030 SCTPDBG(SCTP_DEBUG_INPUT2, 3031 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 3032 if (stcb == NULL) 3033 return; 3034 3035 asoc = &stcb->asoc; 3036 3037 sctp_stop_all_cookie_timers(stcb); 3038 /* process according to association state */ 3039 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 3040 /* state change only needed when I am in right state */ 3041 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 3042 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 3043 sctp_start_net_timers(stcb); 3044 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 3045 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 3046 stcb->sctp_ep, stcb, asoc->primary_destination); 3047 3048 } 3049 /* update RTO */ 3050 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 3051 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 3052 if (asoc->overall_error_count == 0) { 3053 net->RTO = sctp_calculate_rto(stcb, asoc, net, 3054 &asoc->time_entered, sctp_align_safe_nocopy, 3055 SCTP_RTT_FROM_NON_DATA); 3056 } 3057 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 3058 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3059 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 3060 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 3061 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3062 struct socket *so; 3063 3064 #endif 3065 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 3066 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3067 so = SCTP_INP_SO(stcb->sctp_ep); 3068 atomic_add_int(&stcb->asoc.refcnt, 1); 3069 SCTP_TCB_UNLOCK(stcb); 3070 SCTP_SOCKET_LOCK(so, 1); 3071 SCTP_TCB_LOCK(stcb); 3072 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3073 #endif 3074 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3075 soisconnected(stcb->sctp_socket); 3076 } 3077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3078 SCTP_SOCKET_UNLOCK(so, 1); 3079 #endif 3080 } 3081 /* 3082 * since we did not send a HB make sure we don't double 3083 * things 3084 */ 3085 net->hb_responded = 1; 3086 3087 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3088 /* We don't need to do the asconf thing, 3089 * nor hb or autoclose if the socket is closed. 3090 */ 3091 goto closed_socket; 3092 } 3093 3094 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3095 stcb, net); 3096 3097 3098 if (stcb->asoc.sctp_autoclose_ticks && 3099 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3100 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3101 stcb->sctp_ep, stcb, NULL); 3102 } 3103 /* 3104 * send ASCONF if parameters are pending and ASCONFs are 3105 * allowed (eg. addresses changed when init/cookie echo were 3106 * in flight) 3107 */ 3108 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3109 (stcb->asoc.peer_supports_asconf) && 3110 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3111 #ifdef SCTP_TIMER_BASED_ASCONF 3112 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3113 stcb->sctp_ep, stcb, 3114 stcb->asoc.primary_destination); 3115 #else 3116 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3117 SCTP_ADDR_NOT_LOCKED); 3118 #endif 3119 } 3120 } 3121 closed_socket: 3122 /* Toss the cookie if I can */ 3123 sctp_toss_old_cookies(stcb, asoc); 3124 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3125 /* Restart the timer if we have pending data */ 3126 struct sctp_tmit_chunk *chk; 3127 3128 chk = TAILQ_FIRST(&asoc->sent_queue); 3129 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3130 } 3131 } 3132 3133 static void 3134 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3135 struct sctp_tcb *stcb) 3136 { 3137 struct sctp_nets *net; 3138 struct sctp_tmit_chunk *lchk; 3139 struct sctp_ecne_chunk bkup; 3140 uint8_t override_bit; 3141 uint32_t tsn, window_data_tsn; 3142 int len; 3143 unsigned int pkt_cnt; 3144 3145 len = ntohs(cp->ch.chunk_length); 3146 if ((len != sizeof(struct sctp_ecne_chunk)) && 3147 (len != sizeof(struct old_sctp_ecne_chunk))) { 3148 return; 3149 } 3150 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3151 /* Its the old format */ 3152 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3153 bkup.num_pkts_since_cwr = htonl(1); 3154 cp = &bkup; 3155 } 3156 SCTP_STAT_INCR(sctps_recvecne); 3157 tsn = ntohl(cp->tsn); 3158 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3159 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3160 if (lchk == NULL) { 3161 window_data_tsn = stcb->asoc.sending_seq - 1; 3162 } else { 3163 window_data_tsn = lchk->rec.data.TSN_seq; 3164 } 3165 3166 /* Find where it was sent to if possible. */ 3167 net = NULL; 3168 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3169 if (lchk->rec.data.TSN_seq == tsn) { 3170 net = lchk->whoTo; 3171 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3172 break; 3173 } 3174 if (SCTP_TSN_GT(lchk->rec.data.TSN_seq, tsn)) { 3175 break; 3176 } 3177 } 3178 if (net == NULL) { 3179 /* 3180 * What to do. A previous send of a 3181 * CWR was possibly lost. See how old it is, we 3182 * may have it marked on the actual net. 3183 */ 3184 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3185 if (tsn == net->last_cwr_tsn) { 3186 /* Found him, send it off */ 3187 break; 3188 } 3189 } 3190 if (net == NULL) { 3191 /* 3192 * If we reach here, we need to send a special 3193 * CWR that says hey, we did this a long time 3194 * ago and you lost the response. 3195 */ 3196 net = TAILQ_FIRST(&stcb->asoc.nets); 3197 if (net == NULL) { 3198 /* TSNH */ 3199 return; 3200 } 3201 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3202 } else { 3203 override_bit = 0; 3204 } 3205 } else { 3206 override_bit = 0; 3207 } 3208 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3209 ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3210 /* JRS - Use the congestion control given in the pluggable CC module */ 3211 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3212 /* 3213 * We reduce once every RTT. So we will only lower cwnd at 3214 * the next sending seq i.e. the window_data_tsn 3215 */ 3216 net->cwr_window_tsn = window_data_tsn; 3217 net->ecn_ce_pkt_cnt += pkt_cnt; 3218 net->lost_cnt = pkt_cnt; 3219 net->last_cwr_tsn = tsn; 3220 } else { 3221 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3222 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3223 ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3224 /* 3225 * Another loss in the same window update how 3226 * many marks/packets lost we have had. 3227 */ 3228 int cnt = 1; 3229 if (pkt_cnt > net->lost_cnt) { 3230 /* Should be the case */ 3231 cnt = (pkt_cnt - net->lost_cnt); 3232 net->ecn_ce_pkt_cnt += cnt; 3233 } 3234 net->lost_cnt = pkt_cnt; 3235 net->last_cwr_tsn = tsn; 3236 /* 3237 * Most CC functions will ignore this call, since we are in-window 3238 * yet of the initial CE the peer saw. 3239 */ 3240 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3241 } 3242 } 3243 /* 3244 * We always send a CWR this way if our previous one was lost our 3245 * peer will get an update, or if it is not time again to reduce we 3246 * still get the cwr to the peer. Note we set the override when we 3247 * could not find the TSN on the chunk or the destination network. 3248 */ 3249 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3250 } 3251 3252 static void 3253 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3254 { 3255 /* 3256 * Here we get a CWR from the peer. We must look in the outqueue and 3257 * make sure that we have a covered ECNE in the control chunk part. 3258 * If so remove it. 3259 */ 3260 struct sctp_tmit_chunk *chk; 3261 struct sctp_ecne_chunk *ecne; 3262 int override; 3263 uint32_t cwr_tsn; 3264 cwr_tsn = ntohl(cp->tsn); 3265 3266 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3267 TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) { 3268 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3269 continue; 3270 } 3271 if ((override == 0) && (chk->whoTo != net)) { 3272 /* Must be from the right src unless override is set */ 3273 continue; 3274 } 3275 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3276 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3277 /* this covers this ECNE, we can remove it */ 3278 stcb->asoc.ecn_echo_cnt_onq--; 3279 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3280 sctp_next); 3281 if (chk->data) { 3282 sctp_m_freem(chk->data); 3283 chk->data = NULL; 3284 } 3285 stcb->asoc.ctrl_queue_cnt--; 3286 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3287 if (override == 0) { 3288 break; 3289 } 3290 } 3291 } 3292 } 3293 3294 static void 3295 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3296 struct sctp_tcb *stcb, struct sctp_nets *net) 3297 { 3298 struct sctp_association *asoc; 3299 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3300 struct socket *so; 3301 #endif 3302 3303 SCTPDBG(SCTP_DEBUG_INPUT2, 3304 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3305 if (stcb == NULL) 3306 return; 3307 3308 asoc = &stcb->asoc; 3309 /* process according to association state */ 3310 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3311 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3312 SCTPDBG(SCTP_DEBUG_INPUT2, 3313 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3314 SCTP_TCB_UNLOCK(stcb); 3315 return; 3316 } 3317 /* notify upper layer protocol */ 3318 if (stcb->sctp_socket) { 3319 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3320 } 3321 #ifdef INVARIANTS 3322 if (!TAILQ_EMPTY(&asoc->send_queue) || 3323 !TAILQ_EMPTY(&asoc->sent_queue) || 3324 !stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 3325 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3326 } 3327 #endif 3328 /* stop the timer */ 3329 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_22); 3330 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3331 /* free the TCB */ 3332 SCTPDBG(SCTP_DEBUG_INPUT2, 3333 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3334 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3335 so = SCTP_INP_SO(stcb->sctp_ep); 3336 atomic_add_int(&stcb->asoc.refcnt, 1); 3337 SCTP_TCB_UNLOCK(stcb); 3338 SCTP_SOCKET_LOCK(so, 1); 3339 SCTP_TCB_LOCK(stcb); 3340 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3341 #endif 3342 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_23); 3343 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3344 SCTP_SOCKET_UNLOCK(so, 1); 3345 #endif 3346 return; 3347 } 3348 3349 static int 3350 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3351 struct sctp_nets *net, uint8_t flg) 3352 { 3353 switch (desc->chunk_type) { 3354 case SCTP_DATA: 3355 /* find the tsn to resend (possibly */ 3356 { 3357 uint32_t tsn; 3358 struct sctp_tmit_chunk *tp1; 3359 3360 tsn = ntohl(desc->tsn_ifany); 3361 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3362 if (tp1->rec.data.TSN_seq == tsn) { 3363 /* found it */ 3364 break; 3365 } 3366 if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, tsn)) { 3367 /* not found */ 3368 tp1 = NULL; 3369 break; 3370 } 3371 } 3372 if (tp1 == NULL) { 3373 /* 3374 * Do it the other way , aka without paying 3375 * attention to queue seq order. 3376 */ 3377 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3378 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3379 if (tp1->rec.data.TSN_seq == tsn) { 3380 /* found it */ 3381 break; 3382 } 3383 } 3384 } 3385 if (tp1 == NULL) { 3386 SCTP_STAT_INCR(sctps_pdrptsnnf); 3387 } 3388 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3389 uint8_t *ddp; 3390 3391 if (((flg & SCTP_BADCRC) == 0) && 3392 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3393 return (0); 3394 } 3395 if ((stcb->asoc.peers_rwnd == 0) && 3396 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3397 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3398 return (0); 3399 } 3400 if (stcb->asoc.peers_rwnd == 0 && 3401 (flg & SCTP_FROM_MIDDLE_BOX)) { 3402 SCTP_STAT_INCR(sctps_pdrpdizrw); 3403 return (0); 3404 } 3405 ddp = (uint8_t *) (mtod(tp1->data, caddr_t) + 3406 sizeof(struct sctp_data_chunk)); 3407 { 3408 unsigned int iii; 3409 3410 for (iii = 0; iii < sizeof(desc->data_bytes); 3411 iii++) { 3412 if (ddp[iii] != desc->data_bytes[iii]) { 3413 SCTP_STAT_INCR(sctps_pdrpbadd); 3414 return (-1); 3415 } 3416 } 3417 } 3418 3419 if (tp1->do_rtt) { 3420 /* 3421 * this guy had a RTO calculation 3422 * pending on it, cancel it 3423 */ 3424 if (tp1->whoTo->rto_needed == 0) { 3425 tp1->whoTo->rto_needed = 1; 3426 } 3427 tp1->do_rtt = 0; 3428 } 3429 SCTP_STAT_INCR(sctps_pdrpmark); 3430 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3431 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3432 /* 3433 * mark it as if we were doing a FR, since 3434 * we will be getting gap ack reports behind 3435 * the info from the router. 3436 */ 3437 tp1->rec.data.doing_fast_retransmit = 1; 3438 /* 3439 * mark the tsn with what sequences can 3440 * cause a new FR. 3441 */ 3442 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3443 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3444 } else { 3445 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq; 3446 } 3447 3448 /* restart the timer */ 3449 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3450 stcb, tp1->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_24); 3451 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3452 stcb, tp1->whoTo); 3453 3454 /* fix counts and things */ 3455 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3456 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3457 tp1->whoTo->flight_size, 3458 tp1->book_size, 3459 (uintptr_t)stcb, 3460 tp1->rec.data.TSN_seq); 3461 } 3462 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3463 sctp_flight_size_decrease(tp1); 3464 sctp_total_flight_decrease(stcb, tp1); 3465 } 3466 tp1->sent = SCTP_DATAGRAM_RESEND; 3467 } { 3468 /* audit code */ 3469 unsigned int audit; 3470 3471 audit = 0; 3472 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3473 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3474 audit++; 3475 } 3476 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3477 sctp_next) { 3478 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3479 audit++; 3480 } 3481 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3482 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3483 audit, stcb->asoc.sent_queue_retran_cnt); 3484 #ifndef SCTP_AUDITING_ENABLED 3485 stcb->asoc.sent_queue_retran_cnt = audit; 3486 #endif 3487 } 3488 } 3489 } 3490 break; 3491 case SCTP_ASCONF: 3492 { 3493 struct sctp_tmit_chunk *asconf; 3494 3495 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3496 sctp_next) { 3497 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3498 break; 3499 } 3500 } 3501 if (asconf) { 3502 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3503 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3504 asconf->sent = SCTP_DATAGRAM_RESEND; 3505 asconf->snd_count--; 3506 } 3507 } 3508 break; 3509 case SCTP_INITIATION: 3510 /* resend the INIT */ 3511 stcb->asoc.dropped_special_cnt++; 3512 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3513 /* 3514 * If we can get it in, in a few attempts we do 3515 * this, otherwise we let the timer fire. 3516 */ 3517 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3518 stcb, net, SCTP_FROM_SCTP_INPUT+SCTP_LOC_25); 3519 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3520 } 3521 break; 3522 case SCTP_SELECTIVE_ACK: 3523 case SCTP_NR_SELECTIVE_ACK: 3524 /* resend the sack */ 3525 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3526 break; 3527 case SCTP_HEARTBEAT_REQUEST: 3528 /* resend a demand HB */ 3529 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3530 /* Only retransmit if we KNOW we wont destroy the tcb */ 3531 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3532 } 3533 break; 3534 case SCTP_SHUTDOWN: 3535 sctp_send_shutdown(stcb, net); 3536 break; 3537 case SCTP_SHUTDOWN_ACK: 3538 sctp_send_shutdown_ack(stcb, net); 3539 break; 3540 case SCTP_COOKIE_ECHO: 3541 { 3542 struct sctp_tmit_chunk *cookie; 3543 3544 cookie = NULL; 3545 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3546 sctp_next) { 3547 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3548 break; 3549 } 3550 } 3551 if (cookie) { 3552 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3553 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3554 cookie->sent = SCTP_DATAGRAM_RESEND; 3555 sctp_stop_all_cookie_timers(stcb); 3556 } 3557 } 3558 break; 3559 case SCTP_COOKIE_ACK: 3560 sctp_send_cookie_ack(stcb); 3561 break; 3562 case SCTP_ASCONF_ACK: 3563 /* resend last asconf ack */ 3564 sctp_send_asconf_ack(stcb); 3565 break; 3566 case SCTP_FORWARD_CUM_TSN: 3567 send_forward_tsn(stcb, &stcb->asoc); 3568 break; 3569 /* can't do anything with these */ 3570 case SCTP_PACKET_DROPPED: 3571 case SCTP_INITIATION_ACK: /* this should not happen */ 3572 case SCTP_HEARTBEAT_ACK: 3573 case SCTP_ABORT_ASSOCIATION: 3574 case SCTP_OPERATION_ERROR: 3575 case SCTP_SHUTDOWN_COMPLETE: 3576 case SCTP_ECN_ECHO: 3577 case SCTP_ECN_CWR: 3578 default: 3579 break; 3580 } 3581 return (0); 3582 } 3583 3584 void 3585 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3586 { 3587 uint32_t i; 3588 uint16_t temp; 3589 3590 /* 3591 * We set things to 0xffff since this is the last delivered sequence 3592 * and we will be sending in 0 after the reset. 3593 */ 3594 3595 if (number_entries) { 3596 for (i = 0; i < number_entries; i++) { 3597 temp = ntohs(list[i]); 3598 if (temp >= stcb->asoc.streamincnt) { 3599 continue; 3600 } 3601 stcb->asoc.strmin[temp].last_sequence_delivered = 0xffff; 3602 } 3603 } else { 3604 list = NULL; 3605 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3606 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 3607 } 3608 } 3609 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3610 } 3611 3612 static void 3613 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3614 { 3615 uint32_t i; 3616 uint16_t temp; 3617 3618 if (number_entries > 0) { 3619 for (i = 0; i < number_entries; i++) { 3620 temp = ntohs(list[i]); 3621 if (temp >= stcb->asoc.streamoutcnt) { 3622 /* no such stream */ 3623 continue; 3624 } 3625 stcb->asoc.strmout[temp].next_sequence_send = 0; 3626 } 3627 } else { 3628 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3629 stcb->asoc.strmout[i].next_sequence_send = 0; 3630 } 3631 } 3632 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3633 } 3634 3635 3636 struct sctp_stream_reset_out_request * 3637 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3638 { 3639 struct sctp_association *asoc; 3640 struct sctp_chunkhdr *ch; 3641 struct sctp_stream_reset_out_request *r; 3642 struct sctp_tmit_chunk *chk; 3643 int len, clen; 3644 3645 asoc = &stcb->asoc; 3646 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3647 asoc->stream_reset_outstanding = 0; 3648 return (NULL); 3649 } 3650 if (stcb->asoc.str_reset == NULL) { 3651 asoc->stream_reset_outstanding = 0; 3652 return (NULL); 3653 } 3654 chk = stcb->asoc.str_reset; 3655 if (chk->data == NULL) { 3656 return (NULL); 3657 } 3658 if (bchk) { 3659 /* he wants a copy of the chk pointer */ 3660 *bchk = chk; 3661 } 3662 clen = chk->send_size; 3663 ch = mtod(chk->data, struct sctp_chunkhdr *); 3664 r = (struct sctp_stream_reset_out_request *)(ch + 1); 3665 if (ntohl(r->request_seq) == seq) { 3666 /* found it */ 3667 return (r); 3668 } 3669 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3670 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3671 /* move to the next one, there can only be a max of two */ 3672 r = (struct sctp_stream_reset_out_request *)((caddr_t)r + len); 3673 if (ntohl(r->request_seq) == seq) { 3674 return (r); 3675 } 3676 } 3677 /* that seq is not here */ 3678 return (NULL); 3679 } 3680 3681 static void 3682 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3683 { 3684 struct sctp_association *asoc; 3685 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3686 3687 if (stcb->asoc.str_reset == NULL) { 3688 return; 3689 } 3690 asoc = &stcb->asoc; 3691 3692 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo, SCTP_FROM_SCTP_INPUT+SCTP_LOC_26); 3693 TAILQ_REMOVE(&asoc->control_send_queue, 3694 chk, 3695 sctp_next); 3696 if (chk->data) { 3697 sctp_m_freem(chk->data); 3698 chk->data = NULL; 3699 } 3700 asoc->ctrl_queue_cnt--; 3701 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3702 /*sa_ignore NO_NULL_CHK*/ 3703 stcb->asoc.str_reset = NULL; 3704 } 3705 3706 3707 static int 3708 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3709 uint32_t seq, uint32_t action, 3710 struct sctp_stream_reset_response *respin) 3711 { 3712 uint16_t type; 3713 int lparm_len; 3714 struct sctp_association *asoc = &stcb->asoc; 3715 struct sctp_tmit_chunk *chk; 3716 struct sctp_stream_reset_out_request *srparam; 3717 uint32_t number_entries; 3718 3719 if (asoc->stream_reset_outstanding == 0) { 3720 /* duplicate */ 3721 return (0); 3722 } 3723 if (seq == stcb->asoc.str_reset_seq_out) { 3724 srparam = sctp_find_stream_reset(stcb, seq, &chk); 3725 if (srparam) { 3726 stcb->asoc.str_reset_seq_out++; 3727 type = ntohs(srparam->ph.param_type); 3728 lparm_len = ntohs(srparam->ph.param_length); 3729 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3730 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3731 asoc->stream_reset_out_is_outstanding = 0; 3732 if (asoc->stream_reset_outstanding) 3733 asoc->stream_reset_outstanding--; 3734 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3735 /* do it */ 3736 sctp_reset_out_streams(stcb, number_entries, srparam->list_of_streams); 3737 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3738 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3739 } else { 3740 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3741 } 3742 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3743 /* Answered my request */ 3744 number_entries = (lparm_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3745 if (asoc->stream_reset_outstanding) 3746 asoc->stream_reset_outstanding--; 3747 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3748 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3749 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3750 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3751 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3752 number_entries, srparam->list_of_streams, SCTP_SO_NOT_LOCKED); 3753 } 3754 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3755 /* Ok we now may have more streams */ 3756 int num_stream; 3757 3758 num_stream = stcb->asoc.strm_pending_add_size; 3759 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3760 /* TSNH */ 3761 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3762 } 3763 stcb->asoc.strm_pending_add_size = 0; 3764 if (asoc->stream_reset_outstanding) 3765 asoc->stream_reset_outstanding--; 3766 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3767 /* Put the new streams into effect */ 3768 stcb->asoc.streamoutcnt += num_stream; 3769 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3770 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3771 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3772 SCTP_STREAM_CHANGE_DENIED); 3773 } else { 3774 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3775 SCTP_STREAM_CHANGE_FAILED); 3776 } 3777 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3778 if (asoc->stream_reset_outstanding) 3779 asoc->stream_reset_outstanding--; 3780 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3781 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3782 SCTP_STREAM_CHANGE_DENIED); 3783 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3784 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3785 SCTP_STREAM_CHANGE_FAILED); 3786 } 3787 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3788 /** 3789 * a) Adopt the new in tsn. 3790 * b) reset the map 3791 * c) Adopt the new out-tsn 3792 */ 3793 struct sctp_stream_reset_response_tsn *resp; 3794 struct sctp_forward_tsn_chunk fwdtsn; 3795 int abort_flag = 0; 3796 if (respin == NULL) { 3797 /* huh ? */ 3798 return (0); 3799 } 3800 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3801 resp = (struct sctp_stream_reset_response_tsn *)respin; 3802 asoc->stream_reset_outstanding--; 3803 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3804 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3805 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3806 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3807 if (abort_flag) { 3808 return (1); 3809 } 3810 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3811 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3812 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3813 } 3814 3815 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3816 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3817 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3818 3819 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3820 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3821 3822 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3823 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3824 3825 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3826 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3827 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3828 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3829 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3830 SCTP_ASSOC_RESET_DENIED); 3831 } else { 3832 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3833 SCTP_ASSOC_RESET_FAILED); 3834 } 3835 } 3836 /* get rid of the request and get the request flags */ 3837 if (asoc->stream_reset_outstanding == 0) { 3838 sctp_clean_up_stream_reset(stcb); 3839 } 3840 } 3841 } 3842 return (0); 3843 } 3844 3845 static void 3846 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3847 struct sctp_tmit_chunk *chk, 3848 struct sctp_stream_reset_in_request *req, int trunc) 3849 { 3850 uint32_t seq; 3851 int len, i; 3852 int number_entries; 3853 uint16_t temp; 3854 3855 /* 3856 * peer wants me to send a str-reset to him for my outgoing seq's if 3857 * seq_in is right. 3858 */ 3859 struct sctp_association *asoc = &stcb->asoc; 3860 3861 seq = ntohl(req->request_seq); 3862 if (asoc->str_reset_seq_in == seq) { 3863 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3864 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3865 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3866 } else if (trunc) { 3867 /* Can't do it, since they exceeded our buffer size */ 3868 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3869 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3870 len = ntohs(req->ph.param_length); 3871 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3872 for (i = 0; i < number_entries; i++) { 3873 temp = ntohs(req->list_of_streams[i]); 3874 req->list_of_streams[i] = temp; 3875 } 3876 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3877 sctp_add_stream_reset_out(chk, number_entries, req->list_of_streams, 3878 asoc->str_reset_seq_out, 3879 seq, (asoc->sending_seq - 1)); 3880 asoc->stream_reset_out_is_outstanding = 1; 3881 asoc->str_reset = chk; 3882 sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, chk->whoTo); 3883 stcb->asoc.stream_reset_outstanding++; 3884 } else { 3885 /* Can't do it, since we have sent one out */ 3886 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3887 } 3888 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3889 asoc->str_reset_seq_in++; 3890 } else if (asoc->str_reset_seq_in - 1 == seq) { 3891 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3892 } else if (asoc->str_reset_seq_in - 2 == seq) { 3893 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3894 } else { 3895 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3896 } 3897 } 3898 3899 static int 3900 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3901 struct sctp_tmit_chunk *chk, 3902 struct sctp_stream_reset_tsn_request *req) 3903 { 3904 /* reset all in and out and update the tsn */ 3905 /* 3906 * A) reset my str-seq's on in and out. B) Select a receive next, 3907 * and set cum-ack to it. Also process this selected number as a 3908 * fwd-tsn as well. C) set in the response my next sending seq. 3909 */ 3910 struct sctp_forward_tsn_chunk fwdtsn; 3911 struct sctp_association *asoc = &stcb->asoc; 3912 int abort_flag = 0; 3913 uint32_t seq; 3914 3915 seq = ntohl(req->request_seq); 3916 if (asoc->str_reset_seq_in == seq) { 3917 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3918 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3919 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3920 } else { 3921 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3922 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3923 fwdtsn.ch.chunk_flags = 0; 3924 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3925 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3926 if (abort_flag) { 3927 return (1); 3928 } 3929 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3930 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3931 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3932 } 3933 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3934 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3935 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3936 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3937 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3938 atomic_add_int(&asoc->sending_seq, 1); 3939 /* save off historical data for retrans */ 3940 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3941 asoc->last_sending_seq[0] = asoc->sending_seq; 3942 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3943 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3944 sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL); 3945 sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL); 3946 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3947 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3948 } 3949 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3950 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3951 asoc->str_reset_seq_in++; 3952 } else if (asoc->str_reset_seq_in - 1 == seq) { 3953 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3954 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3955 } else if (asoc->str_reset_seq_in - 2 == seq) { 3956 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3957 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3958 } else { 3959 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3960 } 3961 return (0); 3962 } 3963 3964 static void 3965 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3966 struct sctp_tmit_chunk *chk, 3967 struct sctp_stream_reset_out_request *req, int trunc) 3968 { 3969 uint32_t seq, tsn; 3970 int number_entries, len; 3971 struct sctp_association *asoc = &stcb->asoc; 3972 3973 seq = ntohl(req->request_seq); 3974 3975 /* now if its not a duplicate we process it */ 3976 if (asoc->str_reset_seq_in == seq) { 3977 len = ntohs(req->ph.param_length); 3978 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3979 /* 3980 * the sender is resetting, handle the list issue.. we must 3981 * a) verify if we can do the reset, if so no problem b) If 3982 * we can't do the reset we must copy the request. c) queue 3983 * it, and setup the data in processor to trigger it off 3984 * when needed and dequeue all the queued data. 3985 */ 3986 tsn = ntohl(req->send_reset_at_tsn); 3987 3988 /* move the reset action back one */ 3989 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3990 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3991 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3992 } else if (trunc) { 3993 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3994 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3995 /* we can do it now */ 3996 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3997 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3998 } else { 3999 /* 4000 * we must queue it up and thus wait for the TSN's 4001 * to arrive that are at or before tsn 4002 */ 4003 struct sctp_stream_reset_list *liste; 4004 int siz; 4005 4006 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4007 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4008 siz, SCTP_M_STRESET); 4009 if (liste == NULL) { 4010 /* gak out of memory */ 4011 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4012 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4013 return; 4014 } 4015 liste->tsn = tsn; 4016 liste->number_entries = number_entries; 4017 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4018 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4019 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4020 } 4021 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4022 asoc->str_reset_seq_in++; 4023 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4024 /* 4025 * one seq back, just echo back last action since my 4026 * response was lost. 4027 */ 4028 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4029 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4030 /* 4031 * two seq back, just echo back last action since my 4032 * response was lost. 4033 */ 4034 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4035 } else { 4036 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4037 } 4038 } 4039 4040 static void 4041 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4042 struct sctp_stream_reset_add_strm *str_add) 4043 { 4044 /* 4045 * Peer is requesting to add more streams. 4046 * If its within our max-streams we will 4047 * allow it. 4048 */ 4049 uint32_t num_stream, i; 4050 uint32_t seq; 4051 struct sctp_association *asoc = &stcb->asoc; 4052 struct sctp_queued_to_read *ctl, *nctl; 4053 4054 /* Get the number. */ 4055 seq = ntohl(str_add->request_seq); 4056 num_stream = ntohs(str_add->number_of_streams); 4057 /* Now what would be the new total? */ 4058 if (asoc->str_reset_seq_in == seq) { 4059 num_stream += stcb->asoc.streamincnt; 4060 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4061 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4062 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4063 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4064 (num_stream > 0xffff)) { 4065 /* We must reject it they ask for to many */ 4066 denied: 4067 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4068 } else { 4069 /* Ok, we can do that :-) */ 4070 struct sctp_stream_in *oldstrm; 4071 4072 /* save off the old */ 4073 oldstrm = stcb->asoc.strmin; 4074 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4075 (num_stream * sizeof(struct sctp_stream_in)), 4076 SCTP_M_STRMI); 4077 if (stcb->asoc.strmin == NULL) { 4078 stcb->asoc.strmin = oldstrm; 4079 goto denied; 4080 } 4081 /* copy off the old data */ 4082 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4083 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4084 stcb->asoc.strmin[i].stream_no = i; 4085 stcb->asoc.strmin[i].last_sequence_delivered = oldstrm[i].last_sequence_delivered; 4086 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4087 /* now anything on those queues? */ 4088 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next, nctl) { 4089 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next); 4090 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next); 4091 } 4092 } 4093 /* Init the new streams */ 4094 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4095 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4096 stcb->asoc.strmin[i].stream_no = i; 4097 stcb->asoc.strmin[i].last_sequence_delivered = 0xffff; 4098 stcb->asoc.strmin[i].delivery_started = 0; 4099 } 4100 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4101 /* update the size */ 4102 stcb->asoc.streamincnt = num_stream; 4103 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4104 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4105 } 4106 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4107 asoc->str_reset_seq_in++; 4108 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4109 /* 4110 * one seq back, just echo back last action since my 4111 * response was lost. 4112 */ 4113 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4114 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4115 /* 4116 * two seq back, just echo back last action since my 4117 * response was lost. 4118 */ 4119 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4120 } else { 4121 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4122 4123 } 4124 } 4125 4126 static void 4127 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4128 struct sctp_stream_reset_add_strm *str_add) 4129 { 4130 /* 4131 * Peer is requesting to add more streams. 4132 * If its within our max-streams we will 4133 * allow it. 4134 */ 4135 uint16_t num_stream; 4136 uint32_t seq; 4137 struct sctp_association *asoc = &stcb->asoc; 4138 4139 /* Get the number. */ 4140 seq = ntohl(str_add->request_seq); 4141 num_stream = ntohs(str_add->number_of_streams); 4142 /* Now what would be the new total? */ 4143 if (asoc->str_reset_seq_in == seq) { 4144 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4145 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4146 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4147 } else if (stcb->asoc.stream_reset_outstanding) { 4148 /* We must reject it we have something pending */ 4149 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4150 } else { 4151 /* Ok, we can do that :-) */ 4152 int mychk; 4153 mychk = stcb->asoc.streamoutcnt; 4154 mychk += num_stream; 4155 if (mychk < 0x10000) { 4156 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4157 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 0, 1, num_stream, 0, 1)) { 4158 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4159 } 4160 } else { 4161 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4162 } 4163 } 4164 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4165 asoc->str_reset_seq_in++; 4166 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4167 /* 4168 * one seq back, just echo back last action since my 4169 * response was lost. 4170 */ 4171 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4172 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4173 /* 4174 * two seq back, just echo back last action since my 4175 * response was lost. 4176 */ 4177 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4178 } else { 4179 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4180 } 4181 } 4182 4183 #if !defined(__Panda__) 4184 #ifdef __GNUC__ 4185 __attribute__ ((noinline)) 4186 #endif 4187 #endif 4188 static int 4189 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4190 struct sctp_chunkhdr *ch_req) 4191 { 4192 int chk_length, param_len, ptype; 4193 struct sctp_paramhdr pstore; 4194 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4195 uint32_t seq = 0; 4196 int num_req = 0; 4197 int trunc = 0; 4198 struct sctp_tmit_chunk *chk; 4199 struct sctp_chunkhdr *ch; 4200 struct sctp_paramhdr *ph; 4201 int ret_code = 0; 4202 int num_param = 0; 4203 4204 /* now it may be a reset or a reset-response */ 4205 chk_length = ntohs(ch_req->chunk_length); 4206 4207 /* setup for adding the response */ 4208 sctp_alloc_a_chunk(stcb, chk); 4209 if (chk == NULL) { 4210 return (ret_code); 4211 } 4212 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4213 chk->rec.chunk_id.can_take_data = 0; 4214 chk->asoc = &stcb->asoc; 4215 chk->no_fr_allowed = 0; 4216 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4217 chk->book_size_scale = 0; 4218 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4219 if (chk->data == NULL) { 4220 strres_nochunk: 4221 if (chk->data) { 4222 sctp_m_freem(chk->data); 4223 chk->data = NULL; 4224 } 4225 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4226 return (ret_code); 4227 } 4228 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4229 4230 /* setup chunk parameters */ 4231 chk->sent = SCTP_DATAGRAM_UNSENT; 4232 chk->snd_count = 0; 4233 chk->whoTo = NULL; 4234 4235 ch = mtod(chk->data, struct sctp_chunkhdr *); 4236 ch->chunk_type = SCTP_STREAM_RESET; 4237 ch->chunk_flags = 0; 4238 ch->chunk_length = htons(chk->send_size); 4239 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4240 offset += sizeof(struct sctp_chunkhdr); 4241 while ((size_t)chk_length >= sizeof(struct sctp_stream_reset_tsn_request)) { 4242 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4243 if (ph == NULL) 4244 break; 4245 param_len = ntohs(ph->param_length); 4246 if (param_len < (int)sizeof(struct sctp_stream_reset_tsn_request)) { 4247 /* bad param */ 4248 break; 4249 } 4250 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, (int)sizeof(cstore)), 4251 (uint8_t *)&cstore); 4252 ptype = ntohs(ph->param_type); 4253 num_param++; 4254 if (param_len > (int)sizeof(cstore)) { 4255 trunc = 1; 4256 } else { 4257 trunc = 0; 4258 } 4259 if (num_param > SCTP_MAX_RESET_PARAMS) { 4260 /* hit the max of parameters already sorry.. */ 4261 break; 4262 } 4263 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4264 struct sctp_stream_reset_out_request *req_out; 4265 req_out = (struct sctp_stream_reset_out_request *)ph; 4266 num_req++; 4267 if (stcb->asoc.stream_reset_outstanding) { 4268 seq = ntohl(req_out->response_seq); 4269 if (seq == stcb->asoc.str_reset_seq_out) { 4270 /* implicit ack */ 4271 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4272 } 4273 } 4274 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4275 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4276 struct sctp_stream_reset_add_strm *str_add; 4277 str_add = (struct sctp_stream_reset_add_strm *)ph; 4278 num_req++; 4279 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4280 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4281 struct sctp_stream_reset_add_strm *str_add; 4282 str_add = (struct sctp_stream_reset_add_strm *)ph; 4283 num_req++; 4284 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4285 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4286 struct sctp_stream_reset_in_request *req_in; 4287 num_req++; 4288 req_in = (struct sctp_stream_reset_in_request *)ph; 4289 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4290 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4291 struct sctp_stream_reset_tsn_request *req_tsn; 4292 num_req++; 4293 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4294 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4295 ret_code = 1; 4296 goto strres_nochunk; 4297 } 4298 /* no more */ 4299 break; 4300 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4301 struct sctp_stream_reset_response *resp; 4302 uint32_t result; 4303 resp = (struct sctp_stream_reset_response *)ph; 4304 seq = ntohl(resp->response_seq); 4305 result = ntohl(resp->result); 4306 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4307 ret_code = 1; 4308 goto strres_nochunk; 4309 } 4310 } else { 4311 break; 4312 } 4313 offset += SCTP_SIZE32(param_len); 4314 chk_length -= SCTP_SIZE32(param_len); 4315 } 4316 if (num_req == 0) { 4317 /* we have no response free the stuff */ 4318 goto strres_nochunk; 4319 } 4320 /* ok we have a chunk to link in */ 4321 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4322 chk, 4323 sctp_next); 4324 stcb->asoc.ctrl_queue_cnt++; 4325 return (ret_code); 4326 } 4327 4328 /* 4329 * Handle a router or endpoints report of a packet loss, there are two ways 4330 * to handle this, either we get the whole packet and must disect it 4331 * ourselves (possibly with truncation and or corruption) or it is a summary 4332 * from a middle box that did the disectting for us. 4333 */ 4334 static void 4335 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4336 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4337 { 4338 uint32_t bottle_bw, on_queue; 4339 uint16_t trunc_len; 4340 unsigned int chlen; 4341 unsigned int at; 4342 struct sctp_chunk_desc desc; 4343 struct sctp_chunkhdr *ch; 4344 4345 chlen = ntohs(cp->ch.chunk_length); 4346 chlen -= sizeof(struct sctp_pktdrop_chunk); 4347 /* XXX possible chlen underflow */ 4348 if (chlen == 0) { 4349 ch = NULL; 4350 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4351 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4352 } else { 4353 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4354 chlen -= sizeof(struct sctphdr); 4355 /* XXX possible chlen underflow */ 4356 memset(&desc, 0, sizeof(desc)); 4357 } 4358 trunc_len = (uint16_t) ntohs(cp->trunc_len); 4359 if (trunc_len > limit) { 4360 trunc_len = limit; 4361 } 4362 4363 /* now the chunks themselves */ 4364 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4365 desc.chunk_type = ch->chunk_type; 4366 /* get amount we need to move */ 4367 at = ntohs(ch->chunk_length); 4368 if (at < sizeof(struct sctp_chunkhdr)) { 4369 /* corrupt chunk, maybe at the end? */ 4370 SCTP_STAT_INCR(sctps_pdrpcrupt); 4371 break; 4372 } 4373 if (trunc_len == 0) { 4374 /* we are supposed to have all of it */ 4375 if (at > chlen) { 4376 /* corrupt skip it */ 4377 SCTP_STAT_INCR(sctps_pdrpcrupt); 4378 break; 4379 } 4380 } else { 4381 /* is there enough of it left ? */ 4382 if (desc.chunk_type == SCTP_DATA) { 4383 if (chlen < (sizeof(struct sctp_data_chunk) + 4384 sizeof(desc.data_bytes))) { 4385 break; 4386 } 4387 } else { 4388 if (chlen < sizeof(struct sctp_chunkhdr)) { 4389 break; 4390 } 4391 } 4392 } 4393 if (desc.chunk_type == SCTP_DATA) { 4394 /* can we get out the tsn? */ 4395 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4396 SCTP_STAT_INCR(sctps_pdrpmbda); 4397 4398 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4399 /* yep */ 4400 struct sctp_data_chunk *dcp; 4401 uint8_t *ddp; 4402 unsigned int iii; 4403 4404 dcp = (struct sctp_data_chunk *)ch; 4405 ddp = (uint8_t *) (dcp + 1); 4406 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4407 desc.data_bytes[iii] = ddp[iii]; 4408 } 4409 desc.tsn_ifany = dcp->dp.tsn; 4410 } else { 4411 /* nope we are done. */ 4412 SCTP_STAT_INCR(sctps_pdrpnedat); 4413 break; 4414 } 4415 } else { 4416 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4417 SCTP_STAT_INCR(sctps_pdrpmbct); 4418 } 4419 4420 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4421 SCTP_STAT_INCR(sctps_pdrppdbrk); 4422 break; 4423 } 4424 if (SCTP_SIZE32(at) > chlen) { 4425 break; 4426 } 4427 chlen -= SCTP_SIZE32(at); 4428 if (chlen < sizeof(struct sctp_chunkhdr)) { 4429 /* done, none left */ 4430 break; 4431 } 4432 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4433 } 4434 /* Now update any rwnd --- possibly */ 4435 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4436 /* From a peer, we get a rwnd report */ 4437 uint32_t a_rwnd; 4438 4439 SCTP_STAT_INCR(sctps_pdrpfehos); 4440 4441 bottle_bw = ntohl(cp->bottle_bw); 4442 on_queue = ntohl(cp->current_onq); 4443 if (bottle_bw && on_queue) { 4444 /* a rwnd report is in here */ 4445 if (bottle_bw > on_queue) 4446 a_rwnd = bottle_bw - on_queue; 4447 else 4448 a_rwnd = 0; 4449 4450 if (a_rwnd == 0) 4451 stcb->asoc.peers_rwnd = 0; 4452 else { 4453 if (a_rwnd > stcb->asoc.total_flight) { 4454 stcb->asoc.peers_rwnd = 4455 a_rwnd - stcb->asoc.total_flight; 4456 } else { 4457 stcb->asoc.peers_rwnd = 0; 4458 } 4459 if (stcb->asoc.peers_rwnd < 4460 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4461 /* SWS sender side engages */ 4462 stcb->asoc.peers_rwnd = 0; 4463 } 4464 } 4465 } 4466 } else { 4467 SCTP_STAT_INCR(sctps_pdrpfmbox); 4468 } 4469 4470 /* now middle boxes in sat networks get a cwnd bump */ 4471 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4472 (stcb->asoc.sat_t3_loss_recovery == 0) && 4473 (stcb->asoc.sat_network)) { 4474 /* 4475 * This is debateable but for sat networks it makes sense 4476 * Note if a T3 timer has went off, we will prohibit any 4477 * changes to cwnd until we exit the t3 loss recovery. 4478 */ 4479 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4480 net, cp, &bottle_bw, &on_queue); 4481 } 4482 } 4483 4484 /* 4485 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4486 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4487 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4488 * length of the complete packet outputs: - length: modified to remaining 4489 * length after control processing - netp: modified to new sctp_nets after 4490 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4491 * bad packet,...) otherwise return the tcb for this packet 4492 */ 4493 #if !defined(__Panda__) 4494 #ifdef __GNUC__ 4495 __attribute__ ((noinline)) 4496 #endif 4497 #endif 4498 static struct sctp_tcb * 4499 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4500 struct sockaddr *src, struct sockaddr *dst, 4501 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4502 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4503 #if defined(__FreeBSD__) 4504 uint8_t use_mflowid, uint32_t mflowid, 4505 #endif 4506 uint32_t vrf_id, uint16_t port) 4507 { 4508 struct sctp_association *asoc; 4509 struct mbuf *op_err; 4510 char msg[SCTP_DIAG_INFO_LEN]; 4511 uint32_t vtag_in; 4512 int num_chunks = 0; /* number of control chunks processed */ 4513 uint32_t chk_length; 4514 int ret; 4515 int abort_no_unlock = 0; 4516 int ecne_seen = 0; 4517 /* 4518 * How big should this be, and should it be alloc'd? Lets try the 4519 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4520 * until we get into jumbo grams and such.. 4521 */ 4522 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4523 struct sctp_tcb *locked_tcb = stcb; 4524 int got_auth = 0; 4525 uint32_t auth_offset = 0, auth_len = 0; 4526 int auth_skipped = 0; 4527 int asconf_cnt = 0; 4528 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4529 struct socket *so; 4530 #endif 4531 4532 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4533 iphlen, *offset, length, (void *)stcb); 4534 4535 /* validate chunk header length... */ 4536 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4537 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4538 ntohs(ch->chunk_length)); 4539 if (locked_tcb) { 4540 SCTP_TCB_UNLOCK(locked_tcb); 4541 } 4542 return (NULL); 4543 } 4544 /* 4545 * validate the verification tag 4546 */ 4547 vtag_in = ntohl(sh->v_tag); 4548 4549 if (locked_tcb) { 4550 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4551 } 4552 if (ch->chunk_type == SCTP_INITIATION) { 4553 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4554 ntohs(ch->chunk_length), vtag_in); 4555 if (vtag_in != 0) { 4556 /* protocol error- silently discard... */ 4557 SCTP_STAT_INCR(sctps_badvtag); 4558 if (locked_tcb) { 4559 SCTP_TCB_UNLOCK(locked_tcb); 4560 } 4561 return (NULL); 4562 } 4563 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4564 /* 4565 * If there is no stcb, skip the AUTH chunk and process 4566 * later after a stcb is found (to validate the lookup was 4567 * valid. 4568 */ 4569 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4570 (stcb == NULL) && 4571 !SCTP_BASE_SYSCTL(sctp_auth_disable)) { 4572 /* save this chunk for later processing */ 4573 auth_skipped = 1; 4574 auth_offset = *offset; 4575 auth_len = ntohs(ch->chunk_length); 4576 4577 /* (temporarily) move past this chunk */ 4578 *offset += SCTP_SIZE32(auth_len); 4579 if (*offset >= length) { 4580 /* no more data left in the mbuf chain */ 4581 *offset = length; 4582 if (locked_tcb) { 4583 SCTP_TCB_UNLOCK(locked_tcb); 4584 } 4585 return (NULL); 4586 } 4587 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4588 sizeof(struct sctp_chunkhdr), chunk_buf); 4589 } 4590 if (ch == NULL) { 4591 /* Help */ 4592 *offset = length; 4593 if (locked_tcb) { 4594 SCTP_TCB_UNLOCK(locked_tcb); 4595 } 4596 return (NULL); 4597 } 4598 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4599 goto process_control_chunks; 4600 } 4601 /* 4602 * first check if it's an ASCONF with an unknown src addr we 4603 * need to look inside to find the association 4604 */ 4605 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4606 struct sctp_chunkhdr *asconf_ch = ch; 4607 uint32_t asconf_offset = 0, asconf_len = 0; 4608 4609 /* inp's refcount may be reduced */ 4610 SCTP_INP_INCR_REF(inp); 4611 4612 asconf_offset = *offset; 4613 do { 4614 asconf_len = ntohs(asconf_ch->chunk_length); 4615 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4616 break; 4617 stcb = sctp_findassociation_ep_asconf(m, 4618 *offset, 4619 dst, 4620 sh, &inp, netp, vrf_id); 4621 if (stcb != NULL) 4622 break; 4623 asconf_offset += SCTP_SIZE32(asconf_len); 4624 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4625 sizeof(struct sctp_chunkhdr), chunk_buf); 4626 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4627 if (stcb == NULL) { 4628 /* 4629 * reduce inp's refcount if not reduced in 4630 * sctp_findassociation_ep_asconf(). 4631 */ 4632 SCTP_INP_DECR_REF(inp); 4633 } else { 4634 locked_tcb = stcb; 4635 } 4636 4637 /* now go back and verify any auth chunk to be sure */ 4638 if (auth_skipped && (stcb != NULL)) { 4639 struct sctp_auth_chunk *auth; 4640 4641 auth = (struct sctp_auth_chunk *) 4642 sctp_m_getptr(m, auth_offset, 4643 auth_len, chunk_buf); 4644 got_auth = 1; 4645 auth_skipped = 0; 4646 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4647 auth_offset)) { 4648 /* auth HMAC failed so dump it */ 4649 *offset = length; 4650 if (locked_tcb) { 4651 SCTP_TCB_UNLOCK(locked_tcb); 4652 } 4653 return (NULL); 4654 } else { 4655 /* remaining chunks are HMAC checked */ 4656 stcb->asoc.authenticated = 1; 4657 } 4658 } 4659 } 4660 if (stcb == NULL) { 4661 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4662 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4663 msg); 4664 /* no association, so it's out of the blue... */ 4665 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4666 #if defined(__FreeBSD__) 4667 use_mflowid, mflowid, 4668 #endif 4669 vrf_id, port); 4670 *offset = length; 4671 if (locked_tcb) { 4672 SCTP_TCB_UNLOCK(locked_tcb); 4673 } 4674 return (NULL); 4675 } 4676 asoc = &stcb->asoc; 4677 /* ABORT and SHUTDOWN can use either v_tag... */ 4678 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4679 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4680 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4681 /* Take the T-bit always into account. */ 4682 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4683 (vtag_in == asoc->my_vtag)) || 4684 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4685 (vtag_in == asoc->peer_vtag))) { 4686 /* this is valid */ 4687 } else { 4688 /* drop this packet... */ 4689 SCTP_STAT_INCR(sctps_badvtag); 4690 if (locked_tcb) { 4691 SCTP_TCB_UNLOCK(locked_tcb); 4692 } 4693 return (NULL); 4694 } 4695 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4696 if (vtag_in != asoc->my_vtag) { 4697 /* 4698 * this could be a stale SHUTDOWN-ACK or the 4699 * peer never got the SHUTDOWN-COMPLETE and 4700 * is still hung; we have started a new asoc 4701 * but it won't complete until the shutdown 4702 * is completed 4703 */ 4704 if (locked_tcb) { 4705 SCTP_TCB_UNLOCK(locked_tcb); 4706 } 4707 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 4708 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4709 msg); 4710 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4711 sh, inp, op_err, 4712 #if defined(__FreeBSD__) 4713 use_mflowid, mflowid, 4714 #endif 4715 vrf_id, port); 4716 return (NULL); 4717 } 4718 } else { 4719 /* for all other chunks, vtag must match */ 4720 if (vtag_in != asoc->my_vtag) { 4721 /* invalid vtag... */ 4722 SCTPDBG(SCTP_DEBUG_INPUT3, 4723 "invalid vtag: %xh, expect %xh\n", 4724 vtag_in, asoc->my_vtag); 4725 SCTP_STAT_INCR(sctps_badvtag); 4726 if (locked_tcb) { 4727 SCTP_TCB_UNLOCK(locked_tcb); 4728 } 4729 *offset = length; 4730 return (NULL); 4731 } 4732 } 4733 } /* end if !SCTP_COOKIE_ECHO */ 4734 /* 4735 * process all control chunks... 4736 */ 4737 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4738 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4739 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4740 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4741 /* implied cookie-ack.. we must have lost the ack */ 4742 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4743 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4744 stcb->asoc.overall_error_count, 4745 0, 4746 SCTP_FROM_SCTP_INPUT, 4747 __LINE__); 4748 } 4749 stcb->asoc.overall_error_count = 0; 4750 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4751 *netp); 4752 } 4753 4754 process_control_chunks: 4755 while (IS_SCTP_CONTROL(ch)) { 4756 /* validate chunk length */ 4757 chk_length = ntohs(ch->chunk_length); 4758 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4759 ch->chunk_type, chk_length); 4760 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4761 if (chk_length < sizeof(*ch) || 4762 (*offset + (int)chk_length) > length) { 4763 *offset = length; 4764 if (locked_tcb) { 4765 SCTP_TCB_UNLOCK(locked_tcb); 4766 } 4767 return (NULL); 4768 } 4769 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4770 /* 4771 * INIT-ACK only gets the init ack "header" portion only 4772 * because we don't have to process the peer's COOKIE. All 4773 * others get a complete chunk. 4774 */ 4775 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4776 (ch->chunk_type == SCTP_INITIATION)) { 4777 /* get an init-ack chunk */ 4778 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4779 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4780 if (ch == NULL) { 4781 *offset = length; 4782 if (locked_tcb) { 4783 SCTP_TCB_UNLOCK(locked_tcb); 4784 } 4785 return (NULL); 4786 } 4787 } else { 4788 /* For cookies and all other chunks. */ 4789 if (chk_length > sizeof(chunk_buf)) { 4790 /* 4791 * use just the size of the chunk buffer 4792 * so the front part of our chunks fit in 4793 * contiguous space up to the chunk buffer 4794 * size (508 bytes). 4795 * For chunks that need to get more than that 4796 * they must use the sctp_m_getptr() function 4797 * or other means (e.g. know how to parse mbuf 4798 * chains). Cookies do this already. 4799 */ 4800 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4801 (sizeof(chunk_buf) - 4), 4802 chunk_buf); 4803 if (ch == NULL) { 4804 *offset = length; 4805 if (locked_tcb) { 4806 SCTP_TCB_UNLOCK(locked_tcb); 4807 } 4808 return (NULL); 4809 } 4810 } else { 4811 /* We can fit it all */ 4812 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4813 chk_length, chunk_buf); 4814 if (ch == NULL) { 4815 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4816 *offset = length; 4817 if (locked_tcb) { 4818 SCTP_TCB_UNLOCK(locked_tcb); 4819 } 4820 return (NULL); 4821 } 4822 } 4823 } 4824 num_chunks++; 4825 /* Save off the last place we got a control from */ 4826 if (stcb != NULL) { 4827 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4828 /* 4829 * allow last_control to be NULL if 4830 * ASCONF... ASCONF processing will find the 4831 * right net later 4832 */ 4833 if ((netp != NULL) && (*netp != NULL)) 4834 stcb->asoc.last_control_chunk_from = *netp; 4835 } 4836 } 4837 #ifdef SCTP_AUDITING_ENABLED 4838 sctp_audit_log(0xB0, ch->chunk_type); 4839 #endif 4840 4841 /* check to see if this chunk required auth, but isn't */ 4842 if ((stcb != NULL) && 4843 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 4844 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4845 !stcb->asoc.authenticated) { 4846 /* "silently" ignore */ 4847 SCTP_STAT_INCR(sctps_recvauthmissing); 4848 goto next_chunk; 4849 } 4850 switch (ch->chunk_type) { 4851 case SCTP_INITIATION: 4852 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4853 /* The INIT chunk must be the only chunk. */ 4854 if ((num_chunks > 1) || 4855 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4856 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4857 "INIT not the only chunk"); 4858 sctp_abort_association(inp, stcb, m, iphlen, 4859 src, dst, sh, op_err, 4860 #if defined(__FreeBSD__) 4861 use_mflowid, mflowid, 4862 #endif 4863 vrf_id, port); 4864 *offset = length; 4865 return (NULL); 4866 } 4867 /* Honor our resource limit. */ 4868 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4869 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4870 sctp_abort_association(inp, stcb, m, iphlen, 4871 src, dst, sh, op_err, 4872 #if defined(__FreeBSD__) 4873 use_mflowid, mflowid, 4874 #endif 4875 vrf_id, port); 4876 *offset = length; 4877 return (NULL); 4878 } 4879 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4880 (struct sctp_init_chunk *)ch, inp, 4881 stcb, &abort_no_unlock, 4882 #if defined(__FreeBSD__) 4883 use_mflowid, mflowid, 4884 #endif 4885 vrf_id, port); 4886 *offset = length; 4887 if ((!abort_no_unlock) && (locked_tcb)) { 4888 SCTP_TCB_UNLOCK(locked_tcb); 4889 } 4890 return (NULL); 4891 break; 4892 case SCTP_PAD_CHUNK: 4893 break; 4894 case SCTP_INITIATION_ACK: 4895 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4896 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4897 /* We are not interested anymore */ 4898 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4899 ; 4900 } else { 4901 if (locked_tcb != stcb) { 4902 /* Very unlikely */ 4903 SCTP_TCB_UNLOCK(locked_tcb); 4904 } 4905 *offset = length; 4906 if (stcb) { 4907 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4908 so = SCTP_INP_SO(inp); 4909 atomic_add_int(&stcb->asoc.refcnt, 1); 4910 SCTP_TCB_UNLOCK(stcb); 4911 SCTP_SOCKET_LOCK(so, 1); 4912 SCTP_TCB_LOCK(stcb); 4913 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4914 #endif 4915 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27); 4916 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4917 SCTP_SOCKET_UNLOCK(so, 1); 4918 #endif 4919 } 4920 return (NULL); 4921 } 4922 } 4923 /* The INIT-ACK chunk must be the only chunk. */ 4924 if ((num_chunks > 1) || 4925 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4926 *offset = length; 4927 if (locked_tcb) { 4928 SCTP_TCB_UNLOCK(locked_tcb); 4929 } 4930 return (NULL); 4931 } 4932 if ((netp) && (*netp)) { 4933 ret = sctp_handle_init_ack(m, iphlen, *offset, 4934 src, dst, sh, 4935 (struct sctp_init_ack_chunk *)ch, 4936 stcb, *netp, 4937 &abort_no_unlock, 4938 #if defined(__FreeBSD__) 4939 use_mflowid, mflowid, 4940 #endif 4941 vrf_id); 4942 } else { 4943 ret = -1; 4944 } 4945 *offset = length; 4946 if (abort_no_unlock) { 4947 return (NULL); 4948 } 4949 /* 4950 * Special case, I must call the output routine to 4951 * get the cookie echoed 4952 */ 4953 if ((stcb != NULL) && (ret == 0)) { 4954 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4955 } 4956 if (locked_tcb) { 4957 SCTP_TCB_UNLOCK(locked_tcb); 4958 } 4959 return (NULL); 4960 break; 4961 case SCTP_SELECTIVE_ACK: 4962 { 4963 struct sctp_sack_chunk *sack; 4964 int abort_now = 0; 4965 uint32_t a_rwnd, cum_ack; 4966 uint16_t num_seg, num_dup; 4967 uint8_t flags; 4968 int offset_seg, offset_dup; 4969 4970 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4971 SCTP_STAT_INCR(sctps_recvsacks); 4972 if (stcb == NULL) { 4973 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4974 break; 4975 } 4976 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4977 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4978 break; 4979 } 4980 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4981 /*- 4982 * If we have sent a shutdown-ack, we will pay no 4983 * attention to a sack sent in to us since 4984 * we don't care anymore. 4985 */ 4986 break; 4987 } 4988 sack = (struct sctp_sack_chunk *)ch; 4989 flags = ch->chunk_flags; 4990 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4991 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4992 num_dup = ntohs(sack->sack.num_dup_tsns); 4993 a_rwnd = (uint32_t) ntohl(sack->sack.a_rwnd); 4994 if (sizeof(struct sctp_sack_chunk) + 4995 num_seg * sizeof(struct sctp_gap_ack_block) + 4996 num_dup * sizeof(uint32_t) != chk_length) { 4997 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4998 break; 4999 } 5000 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 5001 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5002 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5003 cum_ack, num_seg, a_rwnd); 5004 stcb->asoc.seen_a_sack_this_pkt = 1; 5005 if ((stcb->asoc.pr_sctp_cnt == 0) && 5006 (num_seg == 0) && 5007 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5008 (stcb->asoc.saw_sack_with_frags == 0) && 5009 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5010 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 5011 ) { 5012 /* We have a SIMPLE sack having no prior segments and 5013 * data on sent queue to be acked.. Use the faster 5014 * path sack processing. We also allow window update 5015 * sacks with no missing segments to go this way too. 5016 */ 5017 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 5018 } else { 5019 if (netp && *netp) 5020 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5021 num_seg, 0, num_dup, &abort_now, flags, 5022 cum_ack, a_rwnd, ecne_seen); 5023 } 5024 if (abort_now) { 5025 /* ABORT signal from sack processing */ 5026 *offset = length; 5027 return (NULL); 5028 } 5029 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5030 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5031 (stcb->asoc.stream_queue_cnt == 0)) { 5032 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5033 } 5034 } 5035 break; 5036 /* EY - nr_sack: If the received chunk is an nr_sack chunk */ 5037 case SCTP_NR_SELECTIVE_ACK: 5038 { 5039 struct sctp_nr_sack_chunk *nr_sack; 5040 int abort_now = 0; 5041 uint32_t a_rwnd, cum_ack; 5042 uint16_t num_seg, num_nr_seg, num_dup; 5043 uint8_t flags; 5044 int offset_seg, offset_dup; 5045 5046 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5047 SCTP_STAT_INCR(sctps_recvsacks); 5048 if (stcb == NULL) { 5049 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5050 break; 5051 } 5052 if ((stcb->asoc.sctp_nr_sack_on_off == 0) || 5053 (stcb->asoc.peer_supports_nr_sack == 0)) { 5054 goto unknown_chunk; 5055 } 5056 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5057 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5058 break; 5059 } 5060 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5061 /*- 5062 * If we have sent a shutdown-ack, we will pay no 5063 * attention to a sack sent in to us since 5064 * we don't care anymore. 5065 */ 5066 break; 5067 } 5068 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5069 flags = ch->chunk_flags; 5070 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5071 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5072 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5073 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5074 a_rwnd = (uint32_t) ntohl(nr_sack->nr_sack.a_rwnd); 5075 if (sizeof(struct sctp_nr_sack_chunk) + 5076 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5077 num_dup * sizeof(uint32_t) != chk_length) { 5078 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5079 break; 5080 } 5081 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5082 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5083 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5084 cum_ack, num_seg, a_rwnd); 5085 stcb->asoc.seen_a_sack_this_pkt = 1; 5086 if ((stcb->asoc.pr_sctp_cnt == 0) && 5087 (num_seg == 0) && (num_nr_seg == 0) && 5088 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5089 (stcb->asoc.saw_sack_with_frags == 0) && 5090 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5091 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5092 /* 5093 * We have a SIMPLE sack having no 5094 * prior segments and data on sent 5095 * queue to be acked. Use the 5096 * faster path sack processing. We 5097 * also allow window update sacks 5098 * with no missing segments to go 5099 * this way too. 5100 */ 5101 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5102 &abort_now, ecne_seen); 5103 } else { 5104 if (netp && *netp) 5105 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5106 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5107 cum_ack, a_rwnd, ecne_seen); 5108 } 5109 if (abort_now) { 5110 /* ABORT signal from sack processing */ 5111 *offset = length; 5112 return (NULL); 5113 } 5114 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5115 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5116 (stcb->asoc.stream_queue_cnt == 0)) { 5117 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5118 } 5119 } 5120 break; 5121 5122 case SCTP_HEARTBEAT_REQUEST: 5123 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5124 if ((stcb) && netp && *netp) { 5125 SCTP_STAT_INCR(sctps_recvheartbeat); 5126 sctp_send_heartbeat_ack(stcb, m, *offset, 5127 chk_length, *netp); 5128 5129 /* He's alive so give him credit */ 5130 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5131 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5132 stcb->asoc.overall_error_count, 5133 0, 5134 SCTP_FROM_SCTP_INPUT, 5135 __LINE__); 5136 } 5137 stcb->asoc.overall_error_count = 0; 5138 } 5139 break; 5140 case SCTP_HEARTBEAT_ACK: 5141 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5142 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5143 /* Its not ours */ 5144 *offset = length; 5145 if (locked_tcb) { 5146 SCTP_TCB_UNLOCK(locked_tcb); 5147 } 5148 return (NULL); 5149 } 5150 /* He's alive so give him credit */ 5151 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5152 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5153 stcb->asoc.overall_error_count, 5154 0, 5155 SCTP_FROM_SCTP_INPUT, 5156 __LINE__); 5157 } 5158 stcb->asoc.overall_error_count = 0; 5159 SCTP_STAT_INCR(sctps_recvheartbeatack); 5160 if (netp && *netp) 5161 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5162 stcb, *netp); 5163 break; 5164 case SCTP_ABORT_ASSOCIATION: 5165 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5166 (void *)stcb); 5167 if ((stcb) && netp && *netp) 5168 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5169 stcb, *netp); 5170 *offset = length; 5171 return (NULL); 5172 break; 5173 case SCTP_SHUTDOWN: 5174 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5175 (void *)stcb); 5176 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5177 *offset = length; 5178 if (locked_tcb) { 5179 SCTP_TCB_UNLOCK(locked_tcb); 5180 } 5181 return (NULL); 5182 } 5183 if (netp && *netp) { 5184 int abort_flag = 0; 5185 5186 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5187 stcb, *netp, &abort_flag); 5188 if (abort_flag) { 5189 *offset = length; 5190 return (NULL); 5191 } 5192 } 5193 break; 5194 case SCTP_SHUTDOWN_ACK: 5195 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5196 if ((stcb) && (netp) && (*netp)) 5197 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5198 *offset = length; 5199 return (NULL); 5200 break; 5201 5202 case SCTP_OPERATION_ERROR: 5203 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5204 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5205 *offset = length; 5206 return (NULL); 5207 } 5208 break; 5209 case SCTP_COOKIE_ECHO: 5210 SCTPDBG(SCTP_DEBUG_INPUT3, 5211 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5212 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5213 ; 5214 } else { 5215 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5216 /* We are not interested anymore */ 5217 abend: 5218 if (stcb) { 5219 SCTP_TCB_UNLOCK(stcb); 5220 } 5221 *offset = length; 5222 return (NULL); 5223 } 5224 } 5225 /* 5226 * First are we accepting? We do this again here 5227 * since it is possible that a previous endpoint WAS 5228 * listening responded to a INIT-ACK and then 5229 * closed. We opened and bound.. and are now no 5230 * longer listening. 5231 */ 5232 5233 if ((stcb == NULL) && (inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit)) { 5234 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5235 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5236 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5237 sctp_abort_association(inp, stcb, m, iphlen, 5238 src, dst, sh, op_err, 5239 #if defined(__FreeBSD__) 5240 use_mflowid, mflowid, 5241 #endif 5242 vrf_id, port); 5243 } 5244 *offset = length; 5245 return (NULL); 5246 } else { 5247 struct mbuf *ret_buf; 5248 struct sctp_inpcb *linp; 5249 if (stcb) { 5250 linp = NULL; 5251 } else { 5252 linp = inp; 5253 } 5254 5255 if (linp) { 5256 SCTP_ASOC_CREATE_LOCK(linp); 5257 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5258 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5259 SCTP_ASOC_CREATE_UNLOCK(linp); 5260 goto abend; 5261 } 5262 } 5263 5264 if (netp) { 5265 ret_buf = 5266 sctp_handle_cookie_echo(m, iphlen, 5267 *offset, 5268 src, dst, 5269 sh, 5270 (struct sctp_cookie_echo_chunk *)ch, 5271 &inp, &stcb, netp, 5272 auth_skipped, 5273 auth_offset, 5274 auth_len, 5275 &locked_tcb, 5276 #if defined(__FreeBSD__) 5277 use_mflowid, 5278 mflowid, 5279 #endif 5280 vrf_id, 5281 port); 5282 } else { 5283 ret_buf = NULL; 5284 } 5285 if (linp) { 5286 SCTP_ASOC_CREATE_UNLOCK(linp); 5287 } 5288 if (ret_buf == NULL) { 5289 if (locked_tcb) { 5290 SCTP_TCB_UNLOCK(locked_tcb); 5291 } 5292 SCTPDBG(SCTP_DEBUG_INPUT3, 5293 "GAK, null buffer\n"); 5294 *offset = length; 5295 return (NULL); 5296 } 5297 /* if AUTH skipped, see if it verified... */ 5298 if (auth_skipped) { 5299 got_auth = 1; 5300 auth_skipped = 0; 5301 } 5302 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5303 /* 5304 * Restart the timer if we have 5305 * pending data 5306 */ 5307 struct sctp_tmit_chunk *chk; 5308 5309 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5310 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5311 } 5312 } 5313 break; 5314 case SCTP_COOKIE_ACK: 5315 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5316 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5317 if (locked_tcb) { 5318 SCTP_TCB_UNLOCK(locked_tcb); 5319 } 5320 return (NULL); 5321 } 5322 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5323 /* We are not interested anymore */ 5324 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5325 ; 5326 } else if (stcb) { 5327 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5328 so = SCTP_INP_SO(inp); 5329 atomic_add_int(&stcb->asoc.refcnt, 1); 5330 SCTP_TCB_UNLOCK(stcb); 5331 SCTP_SOCKET_LOCK(so, 1); 5332 SCTP_TCB_LOCK(stcb); 5333 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5334 #endif 5335 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_27); 5336 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5337 SCTP_SOCKET_UNLOCK(so, 1); 5338 #endif 5339 *offset = length; 5340 return (NULL); 5341 } 5342 } 5343 /* He's alive so give him credit */ 5344 if ((stcb) && netp && *netp) { 5345 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5346 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5347 stcb->asoc.overall_error_count, 5348 0, 5349 SCTP_FROM_SCTP_INPUT, 5350 __LINE__); 5351 } 5352 stcb->asoc.overall_error_count = 0; 5353 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch,stcb, *netp); 5354 } 5355 break; 5356 case SCTP_ECN_ECHO: 5357 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-ECHO\n"); 5358 /* He's alive so give him credit */ 5359 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5360 /* Its not ours */ 5361 if (locked_tcb) { 5362 SCTP_TCB_UNLOCK(locked_tcb); 5363 } 5364 *offset = length; 5365 return (NULL); 5366 } 5367 if (stcb) { 5368 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5369 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5370 stcb->asoc.overall_error_count, 5371 0, 5372 SCTP_FROM_SCTP_INPUT, 5373 __LINE__); 5374 } 5375 stcb->asoc.overall_error_count = 0; 5376 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5377 stcb); 5378 ecne_seen = 1; 5379 } 5380 break; 5381 case SCTP_ECN_CWR: 5382 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5383 /* He's alive so give him credit */ 5384 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5385 /* Its not ours */ 5386 if (locked_tcb) { 5387 SCTP_TCB_UNLOCK(locked_tcb); 5388 } 5389 *offset = length; 5390 return (NULL); 5391 } 5392 if (stcb) { 5393 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5394 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5395 stcb->asoc.overall_error_count, 5396 0, 5397 SCTP_FROM_SCTP_INPUT, 5398 __LINE__); 5399 } 5400 stcb->asoc.overall_error_count = 0; 5401 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5402 } 5403 break; 5404 case SCTP_SHUTDOWN_COMPLETE: 5405 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5406 /* must be first and only chunk */ 5407 if ((num_chunks > 1) || 5408 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5409 *offset = length; 5410 if (locked_tcb) { 5411 SCTP_TCB_UNLOCK(locked_tcb); 5412 } 5413 return (NULL); 5414 } 5415 if ((stcb) && netp && *netp) { 5416 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5417 stcb, *netp); 5418 } 5419 *offset = length; 5420 return (NULL); 5421 break; 5422 case SCTP_ASCONF: 5423 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5424 /* He's alive so give him credit */ 5425 if (stcb) { 5426 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5427 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5428 stcb->asoc.overall_error_count, 5429 0, 5430 SCTP_FROM_SCTP_INPUT, 5431 __LINE__); 5432 } 5433 stcb->asoc.overall_error_count = 0; 5434 sctp_handle_asconf(m, *offset, src, 5435 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5436 asconf_cnt++; 5437 } 5438 break; 5439 case SCTP_ASCONF_ACK: 5440 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5441 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5442 /* Its not ours */ 5443 if (locked_tcb) { 5444 SCTP_TCB_UNLOCK(locked_tcb); 5445 } 5446 *offset = length; 5447 return (NULL); 5448 } 5449 if ((stcb) && netp && *netp) { 5450 /* He's alive so give him credit */ 5451 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5452 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5453 stcb->asoc.overall_error_count, 5454 0, 5455 SCTP_FROM_SCTP_INPUT, 5456 __LINE__); 5457 } 5458 stcb->asoc.overall_error_count = 0; 5459 sctp_handle_asconf_ack(m, *offset, 5460 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5461 if (abort_no_unlock) 5462 return (NULL); 5463 } 5464 break; 5465 case SCTP_FORWARD_CUM_TSN: 5466 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5467 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5468 /* Its not ours */ 5469 if (locked_tcb) { 5470 SCTP_TCB_UNLOCK(locked_tcb); 5471 } 5472 *offset = length; 5473 return (NULL); 5474 } 5475 5476 /* He's alive so give him credit */ 5477 if (stcb) { 5478 int abort_flag = 0; 5479 stcb->asoc.overall_error_count = 0; 5480 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5481 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5482 stcb->asoc.overall_error_count, 5483 0, 5484 SCTP_FROM_SCTP_INPUT, 5485 __LINE__); 5486 } 5487 *fwd_tsn_seen = 1; 5488 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5489 /* We are not interested anymore */ 5490 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5491 so = SCTP_INP_SO(inp); 5492 atomic_add_int(&stcb->asoc.refcnt, 1); 5493 SCTP_TCB_UNLOCK(stcb); 5494 SCTP_SOCKET_LOCK(so, 1); 5495 SCTP_TCB_LOCK(stcb); 5496 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5497 #endif 5498 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, SCTP_FROM_SCTP_INPUT+SCTP_LOC_29); 5499 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5500 SCTP_SOCKET_UNLOCK(so, 1); 5501 #endif 5502 *offset = length; 5503 return (NULL); 5504 } 5505 sctp_handle_forward_tsn(stcb, 5506 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5507 if (abort_flag) { 5508 *offset = length; 5509 return (NULL); 5510 } else { 5511 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5512 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5513 stcb->asoc.overall_error_count, 5514 0, 5515 SCTP_FROM_SCTP_INPUT, 5516 __LINE__); 5517 } 5518 stcb->asoc.overall_error_count = 0; 5519 } 5520 5521 } 5522 break; 5523 case SCTP_STREAM_RESET: 5524 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5525 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5526 /* Its not ours */ 5527 if (locked_tcb) { 5528 SCTP_TCB_UNLOCK(locked_tcb); 5529 } 5530 *offset = length; 5531 return (NULL); 5532 } 5533 if (stcb->asoc.peer_supports_strreset == 0) { 5534 /* 5535 * hmm, peer should have announced this, but 5536 * we will turn it on since he is sending us 5537 * a stream reset. 5538 */ 5539 stcb->asoc.peer_supports_strreset = 1; 5540 } 5541 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5542 /* stop processing */ 5543 *offset = length; 5544 return (NULL); 5545 } 5546 break; 5547 case SCTP_PACKET_DROPPED: 5548 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5549 /* re-get it all please */ 5550 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5551 /* Its not ours */ 5552 if (locked_tcb) { 5553 SCTP_TCB_UNLOCK(locked_tcb); 5554 } 5555 *offset = length; 5556 return (NULL); 5557 } 5558 5559 5560 if (ch && (stcb) && netp && (*netp)) { 5561 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5562 stcb, *netp, 5563 min(chk_length, (sizeof(chunk_buf) - 4))); 5564 5565 } 5566 5567 break; 5568 5569 case SCTP_AUTHENTICATION: 5570 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5571 if (SCTP_BASE_SYSCTL(sctp_auth_disable)) 5572 goto unknown_chunk; 5573 5574 if (stcb == NULL) { 5575 /* save the first AUTH for later processing */ 5576 if (auth_skipped == 0) { 5577 auth_offset = *offset; 5578 auth_len = chk_length; 5579 auth_skipped = 1; 5580 } 5581 /* skip this chunk (temporarily) */ 5582 goto next_chunk; 5583 } 5584 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5585 (chk_length > (sizeof(struct sctp_auth_chunk) + 5586 SCTP_AUTH_DIGEST_LEN_MAX))) { 5587 /* Its not ours */ 5588 if (locked_tcb) { 5589 SCTP_TCB_UNLOCK(locked_tcb); 5590 } 5591 *offset = length; 5592 return (NULL); 5593 } 5594 if (got_auth == 1) { 5595 /* skip this chunk... it's already auth'd */ 5596 goto next_chunk; 5597 } 5598 got_auth = 1; 5599 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5600 m, *offset)) { 5601 /* auth HMAC failed so dump the packet */ 5602 *offset = length; 5603 return (stcb); 5604 } else { 5605 /* remaining chunks are HMAC checked */ 5606 stcb->asoc.authenticated = 1; 5607 } 5608 break; 5609 5610 default: 5611 unknown_chunk: 5612 /* it's an unknown chunk! */ 5613 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5614 struct mbuf *mm; 5615 struct sctp_paramhdr *phd; 5616 5617 mm = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr), 5618 0, M_NOWAIT, 1, MT_DATA); 5619 if (mm) { 5620 phd = mtod(mm, struct sctp_paramhdr *); 5621 /* 5622 * We cheat and use param type since 5623 * we did not bother to define a 5624 * error cause struct. They are the 5625 * same basic format with different 5626 * names. 5627 */ 5628 phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5629 phd->param_length = htons(chk_length + sizeof(*phd)); 5630 SCTP_BUF_LEN(mm) = sizeof(*phd); 5631 SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT); 5632 if (SCTP_BUF_NEXT(mm)) { 5633 if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) { 5634 sctp_m_freem(mm); 5635 } else { 5636 #ifdef SCTP_MBUF_LOGGING 5637 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5638 struct mbuf *mat; 5639 5640 for (mat = SCTP_BUF_NEXT(mm); mat; mat = SCTP_BUF_NEXT(mat)) { 5641 if (SCTP_BUF_IS_EXTENDED(mat)) { 5642 sctp_log_mb(mat, SCTP_MBUF_ICOPY); 5643 } 5644 } 5645 } 5646 #endif 5647 sctp_queue_op_err(stcb, mm); 5648 } 5649 } else { 5650 sctp_m_freem(mm); 5651 } 5652 } 5653 } 5654 if ((ch->chunk_type & 0x80) == 0) { 5655 /* discard this packet */ 5656 *offset = length; 5657 return (stcb); 5658 } /* else skip this bad chunk and continue... */ 5659 break; 5660 } /* switch (ch->chunk_type) */ 5661 5662 5663 next_chunk: 5664 /* get the next chunk */ 5665 *offset += SCTP_SIZE32(chk_length); 5666 if (*offset >= length) { 5667 /* no more data left in the mbuf chain */ 5668 break; 5669 } 5670 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5671 sizeof(struct sctp_chunkhdr), chunk_buf); 5672 if (ch == NULL) { 5673 if (locked_tcb) { 5674 SCTP_TCB_UNLOCK(locked_tcb); 5675 } 5676 *offset = length; 5677 return (NULL); 5678 } 5679 } /* while */ 5680 5681 if (asconf_cnt > 0 && stcb != NULL) { 5682 sctp_send_asconf_ack(stcb); 5683 } 5684 return (stcb); 5685 } 5686 5687 5688 #ifdef INVARIANTS 5689 #ifdef __GNUC__ 5690 __attribute__((noinline)) 5691 #endif 5692 void 5693 sctp_validate_no_locks(struct sctp_inpcb *inp) 5694 { 5695 #ifndef __APPLE__ 5696 struct sctp_tcb *lstcb; 5697 5698 LIST_FOREACH(lstcb, &inp->sctp_asoc_list, sctp_tcblist) { 5699 if (mtx_owned(&lstcb->tcb_mtx)) { 5700 panic("Own lock on stcb at return from input"); 5701 } 5702 } 5703 if (mtx_owned(&inp->inp_create_mtx)) { 5704 panic("Own create lock on inp"); 5705 } 5706 if (mtx_owned(&inp->inp_mtx)) { 5707 panic("Own inp lock on inp"); 5708 } 5709 #endif 5710 } 5711 #endif 5712 5713 /* 5714 * common input chunk processing (v4 and v6) 5715 */ 5716 void 5717 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5718 struct sockaddr *src, struct sockaddr *dst, 5719 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5720 #if !defined(SCTP_WITH_NO_CSUM) 5721 uint8_t compute_crc, 5722 #endif 5723 uint8_t ecn_bits, 5724 #if defined(__FreeBSD__) 5725 uint8_t use_mflowid, uint32_t mflowid, 5726 #endif 5727 uint32_t vrf_id, uint16_t port) 5728 { 5729 uint32_t high_tsn; 5730 int fwd_tsn_seen = 0, data_processed = 0; 5731 struct mbuf *m = *mm, *op_err; 5732 char msg[SCTP_DIAG_INFO_LEN]; 5733 int un_sent; 5734 int cnt_ctrl_ready = 0; 5735 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5736 struct sctp_tcb *stcb = NULL; 5737 struct sctp_nets *net = NULL; 5738 5739 SCTP_STAT_INCR(sctps_recvdatagrams); 5740 #ifdef SCTP_AUDITING_ENABLED 5741 sctp_audit_log(0xE0, 1); 5742 sctp_auditing(0, inp, stcb, net); 5743 #endif 5744 #if !defined(SCTP_WITH_NO_CSUM) 5745 if (compute_crc != 0) { 5746 uint32_t check, calc_check; 5747 5748 check = sh->checksum; 5749 sh->checksum = 0; 5750 calc_check = sctp_calculate_cksum(m, iphlen); 5751 sh->checksum = check; 5752 if (calc_check != check) { 5753 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5754 calc_check, check, (void *)m, length, iphlen); 5755 stcb = sctp_findassociation_addr(m, offset, src, dst, 5756 sh, ch, &inp, &net, vrf_id); 5757 if ((net != NULL) && (port != 0)) { 5758 if (net->port == 0) { 5759 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5760 } 5761 net->port = port; 5762 } 5763 #if defined(__FreeBSD__) 5764 if ((net != NULL) && (use_mflowid != 0)) { 5765 net->flowid = mflowid; 5766 #ifdef INVARIANTS 5767 net->flowidset = 1; 5768 #endif 5769 } 5770 #endif 5771 if ((inp != NULL) && (stcb != NULL)) { 5772 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5773 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5774 } else if ((inp != NULL) && (stcb == NULL)) { 5775 inp_decr = inp; 5776 } 5777 SCTP_STAT_INCR(sctps_badsum); 5778 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5779 goto out; 5780 } 5781 } 5782 #endif 5783 /* Destination port of 0 is illegal, based on RFC4960. */ 5784 if (sh->dest_port == 0) { 5785 SCTP_STAT_INCR(sctps_hdrops); 5786 goto out; 5787 } 5788 stcb = sctp_findassociation_addr(m, offset, src, dst, 5789 sh, ch, &inp, &net, vrf_id); 5790 if ((net != NULL) && (port != 0)) { 5791 if (net->port == 0) { 5792 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5793 } 5794 net->port = port; 5795 } 5796 #if defined(__FreeBSD__) 5797 if ((net != NULL) && (use_mflowid != 0)) { 5798 net->flowid = mflowid; 5799 #ifdef INVARIANTS 5800 net->flowidset = 1; 5801 #endif 5802 } 5803 #endif 5804 if (inp == NULL) { 5805 SCTP_STAT_INCR(sctps_noport); 5806 #if defined(__FreeBSD__) && (((__FreeBSD_version < 900000) && (__FreeBSD_version >= 804000)) || (__FreeBSD_version > 900000)) 5807 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5808 goto out; 5809 } 5810 #endif 5811 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5812 sctp_send_shutdown_complete2(src, dst, sh, 5813 #if defined(__FreeBSD__) 5814 use_mflowid, mflowid, 5815 #endif 5816 vrf_id, port); 5817 goto out; 5818 } 5819 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5820 goto out; 5821 } 5822 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5823 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5824 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5825 (ch->chunk_type != SCTP_INIT))) { 5826 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5827 "Out of the blue"); 5828 sctp_send_abort(m, iphlen, src, dst, 5829 sh, 0, op_err, 5830 #if defined(__FreeBSD__) 5831 use_mflowid, mflowid, 5832 #endif 5833 vrf_id, port); 5834 } 5835 } 5836 goto out; 5837 } else if (stcb == NULL) { 5838 inp_decr = inp; 5839 } 5840 #ifdef IPSEC 5841 /*- 5842 * I very much doubt any of the IPSEC stuff will work but I have no 5843 * idea, so I will leave it in place. 5844 */ 5845 if (inp != NULL) { 5846 switch (dst->sa_family) { 5847 #ifdef INET 5848 case AF_INET: 5849 if (ipsec4_in_reject(m, &inp->ip_inp.inp)) { 5850 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036) 5851 IPSECSTAT_INC(ips_in_polvio); 5852 #else 5853 MODULE_GLOBAL(ipsec4stat).in_polvio++; 5854 #endif 5855 SCTP_STAT_INCR(sctps_hdrops); 5856 goto out; 5857 } 5858 break; 5859 #endif 5860 #ifdef INET6 5861 case AF_INET6: 5862 if (ipsec6_in_reject(m, &inp->ip_inp.inp)) { 5863 #if defined(__FreeBSD__) && (__FreeBSD_version > 1000036) 5864 IPSEC6STAT_INC(ips_in_polvio); 5865 #else 5866 MODULE_GLOBAL(ipsec6stat).in_polvio++; 5867 #endif 5868 SCTP_STAT_INCR(sctps_hdrops); 5869 goto out; 5870 } 5871 break; 5872 #endif 5873 default: 5874 break; 5875 } 5876 } 5877 #endif 5878 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5879 (void *)m, iphlen, offset, length, (void *)stcb); 5880 if (stcb) { 5881 /* always clear this before beginning a packet */ 5882 stcb->asoc.authenticated = 0; 5883 stcb->asoc.seen_a_sack_this_pkt = 0; 5884 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5885 (void *)stcb, stcb->asoc.state); 5886 5887 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5888 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5889 /*- 5890 * If we hit here, we had a ref count 5891 * up when the assoc was aborted and the 5892 * timer is clearing out the assoc, we should 5893 * NOT respond to any packet.. its OOTB. 5894 */ 5895 SCTP_TCB_UNLOCK(stcb); 5896 stcb = NULL; 5897 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5898 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5899 msg); 5900 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5901 #if defined(__FreeBSD__) 5902 use_mflowid, mflowid, 5903 #endif 5904 vrf_id, port); 5905 goto out; 5906 } 5907 5908 } 5909 if (IS_SCTP_CONTROL(ch)) { 5910 /* process the control portion of the SCTP packet */ 5911 /* sa_ignore NO_NULL_CHK */ 5912 stcb = sctp_process_control(m, iphlen, &offset, length, 5913 src, dst, sh, ch, 5914 inp, stcb, &net, &fwd_tsn_seen, 5915 #if defined(__FreeBSD__) 5916 use_mflowid, mflowid, 5917 #endif 5918 vrf_id, port); 5919 if (stcb) { 5920 /* This covers us if the cookie-echo was there 5921 * and it changes our INP. 5922 */ 5923 inp = stcb->sctp_ep; 5924 if ((net) && (port)) { 5925 if (net->port == 0) { 5926 sctp_pathmtu_adjustment(stcb, net->mtu - sizeof(struct udphdr)); 5927 } 5928 net->port = port; 5929 } 5930 } 5931 } else { 5932 /* 5933 * no control chunks, so pre-process DATA chunks (these 5934 * checks are taken care of by control processing) 5935 */ 5936 5937 /* 5938 * if DATA only packet, and auth is required, then punt... 5939 * can't have authenticated without any AUTH (control) 5940 * chunks 5941 */ 5942 if ((stcb != NULL) && 5943 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5944 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5945 /* "silently" ignore */ 5946 SCTP_STAT_INCR(sctps_recvauthmissing); 5947 goto out; 5948 } 5949 if (stcb == NULL) { 5950 /* out of the blue DATA chunk */ 5951 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 5952 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5953 msg); 5954 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5955 #if defined(__FreeBSD__) 5956 use_mflowid, mflowid, 5957 #endif 5958 vrf_id, port); 5959 goto out; 5960 } 5961 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5962 /* v_tag mismatch! */ 5963 SCTP_STAT_INCR(sctps_badvtag); 5964 goto out; 5965 } 5966 } 5967 5968 if (stcb == NULL) { 5969 /* 5970 * no valid TCB for this packet, or we found it's a bad 5971 * packet while processing control, or we're done with this 5972 * packet (done or skip rest of data), so we drop it... 5973 */ 5974 goto out; 5975 } 5976 5977 /* 5978 * DATA chunk processing 5979 */ 5980 /* plow through the data chunks while length > offset */ 5981 5982 /* 5983 * Rest should be DATA only. Check authentication state if AUTH for 5984 * DATA is required. 5985 */ 5986 if ((length > offset) && 5987 (stcb != NULL) && 5988 !SCTP_BASE_SYSCTL(sctp_auth_disable) && 5989 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5990 !stcb->asoc.authenticated) { 5991 /* "silently" ignore */ 5992 SCTP_STAT_INCR(sctps_recvauthmissing); 5993 SCTPDBG(SCTP_DEBUG_AUTH1, 5994 "Data chunk requires AUTH, skipped\n"); 5995 goto trigger_send; 5996 } 5997 if (length > offset) { 5998 int retval; 5999 6000 /* 6001 * First check to make sure our state is correct. We would 6002 * not get here unless we really did have a tag, so we don't 6003 * abort if this happens, just dump the chunk silently. 6004 */ 6005 switch (SCTP_GET_STATE(&stcb->asoc)) { 6006 case SCTP_STATE_COOKIE_ECHOED: 6007 /* 6008 * we consider data with valid tags in this state 6009 * shows us the cookie-ack was lost. Imply it was 6010 * there. 6011 */ 6012 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 6013 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 6014 stcb->asoc.overall_error_count, 6015 0, 6016 SCTP_FROM_SCTP_INPUT, 6017 __LINE__); 6018 } 6019 stcb->asoc.overall_error_count = 0; 6020 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 6021 break; 6022 case SCTP_STATE_COOKIE_WAIT: 6023 /* 6024 * We consider OOTB any data sent during asoc setup. 6025 */ 6026 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s\n", __FILE__, __LINE__, __FUNCTION__); 6027 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 6028 msg); 6029 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 6030 #if defined(__FreeBSD__) 6031 use_mflowid, mflowid, 6032 #endif 6033 vrf_id, port); 6034 goto out; 6035 /*sa_ignore NOTREACHED*/ 6036 break; 6037 case SCTP_STATE_EMPTY: /* should not happen */ 6038 case SCTP_STATE_INUSE: /* should not happen */ 6039 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 6040 case SCTP_STATE_SHUTDOWN_ACK_SENT: 6041 default: 6042 goto out; 6043 /*sa_ignore NOTREACHED*/ 6044 break; 6045 case SCTP_STATE_OPEN: 6046 case SCTP_STATE_SHUTDOWN_SENT: 6047 break; 6048 } 6049 /* plow through the data chunks while length > offset */ 6050 retval = sctp_process_data(mm, iphlen, &offset, length, 6051 src, dst, sh, 6052 inp, stcb, net, &high_tsn, 6053 #if defined(__FreeBSD__) 6054 use_mflowid, mflowid, 6055 #endif 6056 vrf_id, port); 6057 if (retval == 2) { 6058 /* 6059 * The association aborted, NO UNLOCK needed since 6060 * the association is destroyed. 6061 */ 6062 stcb = NULL; 6063 goto out; 6064 } 6065 data_processed = 1; 6066 /* 6067 * Anything important needs to have been m_copy'ed in 6068 * process_data 6069 */ 6070 } 6071 6072 /* take care of ecn */ 6073 if ((data_processed == 1) && 6074 (stcb->asoc.ecn_allowed == 1) && 6075 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6076 /* Yep, we need to add a ECNE */ 6077 sctp_send_ecn_echo(stcb, net, high_tsn); 6078 } 6079 6080 if ((data_processed == 0) && (fwd_tsn_seen)) { 6081 int was_a_gap; 6082 uint32_t highest_tsn; 6083 6084 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6085 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6086 } else { 6087 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6088 } 6089 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6090 stcb->asoc.send_sack = 1; 6091 sctp_sack_check(stcb, was_a_gap); 6092 } else if (fwd_tsn_seen) { 6093 stcb->asoc.send_sack = 1; 6094 } 6095 /* trigger send of any chunks in queue... */ 6096 trigger_send: 6097 #ifdef SCTP_AUDITING_ENABLED 6098 sctp_audit_log(0xE0, 2); 6099 sctp_auditing(1, inp, stcb, net); 6100 #endif 6101 SCTPDBG(SCTP_DEBUG_INPUT1, 6102 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6103 stcb->asoc.peers_rwnd, 6104 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6105 stcb->asoc.total_flight); 6106 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6107 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6108 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6109 } 6110 if (cnt_ctrl_ready || 6111 ((un_sent) && 6112 (stcb->asoc.peers_rwnd > 0 || 6113 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6114 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6115 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6116 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6117 } 6118 #ifdef SCTP_AUDITING_ENABLED 6119 sctp_audit_log(0xE0, 3); 6120 sctp_auditing(2, inp, stcb, net); 6121 #endif 6122 out: 6123 if (stcb != NULL) { 6124 SCTP_TCB_UNLOCK(stcb); 6125 } 6126 if (inp_decr != NULL) { 6127 /* reduce ref-count */ 6128 SCTP_INP_WLOCK(inp_decr); 6129 SCTP_INP_DECR_REF(inp_decr); 6130 SCTP_INP_WUNLOCK(inp_decr); 6131 } 6132 #ifdef INVARIANTS 6133 if (inp != NULL) { 6134 sctp_validate_no_locks(inp); 6135 } 6136 #endif 6137 return; 6138 } 6139 6140 #if 0 6141 static void 6142 sctp_print_mbuf_chain(struct mbuf *m) 6143 { 6144 for (; m; m = SCTP_BUF_NEXT(m)) { 6145 SCTP_PRINTF("%p: m_len = %ld\n", (void *)m, SCTP_BUF_LEN(m)); 6146 if (SCTP_BUF_IS_EXTENDED(m)) 6147 SCTP_PRINTF("%p: extend_size = %d\n", (void *)m, SCTP_BUF_EXTEND_SIZE(m)); 6148 } 6149 } 6150 #endif 6151 6152 #ifdef INET 6153 #if !defined(__Userspace__) 6154 #if defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__) 6155 void 6156 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6157 #elif defined(__Panda__) 6158 void 6159 sctp_input(pakhandle_type i_pak) 6160 #else 6161 void 6162 #if __STDC__ 6163 sctp_input(struct mbuf *i_pak,...) 6164 #else 6165 sctp_input(i_pak, va_alist) 6166 struct mbuf *i_pak; 6167 #endif 6168 #endif 6169 { 6170 struct mbuf *m; 6171 int iphlen; 6172 uint32_t vrf_id = 0; 6173 uint8_t ecn_bits; 6174 struct sockaddr_in src, dst; 6175 struct ip *ip; 6176 struct sctphdr *sh; 6177 struct sctp_chunkhdr *ch; 6178 int length, offset; 6179 #if !defined(SCTP_WITH_NO_CSUM) 6180 uint8_t compute_crc; 6181 #endif 6182 #if defined(__FreeBSD__) 6183 uint32_t mflowid; 6184 uint8_t use_mflowid; 6185 #endif 6186 #if !(defined(__FreeBSD__) || defined(__APPLE__) || defined(__Windows__)) 6187 uint16_t port = 0; 6188 #endif 6189 6190 #if defined(__Panda__) 6191 /* This is Evil, but its the only way to make panda work right. */ 6192 iphlen = sizeof(struct ip); 6193 #else 6194 iphlen = off; 6195 #endif 6196 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6197 SCTP_RELEASE_PKT(i_pak); 6198 return; 6199 } 6200 m = SCTP_HEADER_TO_CHAIN(i_pak); 6201 #ifdef __Panda__ 6202 SCTP_DETACH_HEADER_FROM_CHAIN(i_pak); 6203 (void)SCTP_RELEASE_HEADER(i_pak); 6204 #endif 6205 #ifdef SCTP_MBUF_LOGGING 6206 /* Log in any input mbufs */ 6207 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6208 struct mbuf *mat; 6209 6210 for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) { 6211 if (SCTP_BUF_IS_EXTENDED(mat)) { 6212 sctp_log_mb(mat, SCTP_MBUF_INPUT); 6213 } 6214 } 6215 } 6216 #endif 6217 #ifdef SCTP_PACKET_LOGGING 6218 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6219 sctp_packet_log(m); 6220 } 6221 #endif 6222 #if defined(__FreeBSD__) 6223 #if __FreeBSD_version > 1000049 6224 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6225 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6226 m->m_pkthdr.len, 6227 if_name(m->m_pkthdr.rcvif), 6228 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6229 #elif __FreeBSD_version >= 800000 6230 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6231 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 6232 m->m_pkthdr.len, 6233 if_name(m->m_pkthdr.rcvif), 6234 m->m_pkthdr.csum_flags); 6235 #else 6236 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6237 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 6238 m->m_pkthdr.len, 6239 m->m_pkthdr.rcvif->if_xname, 6240 m->m_pkthdr.csum_flags); 6241 #endif 6242 #endif 6243 #if defined(__APPLE__) 6244 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6245 "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n", 6246 m->m_pkthdr.len, 6247 m->m_pkthdr.rcvif->if_name, 6248 m->m_pkthdr.rcvif->if_unit, 6249 m->m_pkthdr.csum_flags); 6250 #endif 6251 #if defined(__Windows__) 6252 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6253 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n", 6254 m->m_pkthdr.len, 6255 m->m_pkthdr.rcvif->if_xname, 6256 m->m_pkthdr.csum_flags); 6257 #endif 6258 #if defined(__FreeBSD__) 6259 if (m->m_flags & M_FLOWID) { 6260 mflowid = m->m_pkthdr.flowid; 6261 use_mflowid = 1; 6262 } else { 6263 mflowid = 0; 6264 use_mflowid = 0; 6265 } 6266 #endif 6267 SCTP_STAT_INCR(sctps_recvpackets); 6268 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6269 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6270 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6271 if (SCTP_BUF_LEN(m) < offset) { 6272 if ((m = m_pullup(m, offset)) == NULL) { 6273 SCTP_STAT_INCR(sctps_hdrops); 6274 return; 6275 } 6276 } 6277 ip = mtod(m, struct ip *); 6278 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6279 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6280 offset -= sizeof(struct sctp_chunkhdr); 6281 memset(&src, 0, sizeof(struct sockaddr_in)); 6282 src.sin_family = AF_INET; 6283 #ifdef HAVE_SIN_LEN 6284 src.sin_len = sizeof(struct sockaddr_in); 6285 #endif 6286 src.sin_port = sh->src_port; 6287 src.sin_addr = ip->ip_src; 6288 memset(&dst, 0, sizeof(struct sockaddr_in)); 6289 dst.sin_family = AF_INET; 6290 #ifdef HAVE_SIN_LEN 6291 dst.sin_len = sizeof(struct sockaddr_in); 6292 #endif 6293 dst.sin_port = sh->dest_port; 6294 dst.sin_addr = ip->ip_dst; 6295 #if defined(__Windows__) 6296 NTOHS(ip->ip_len); 6297 #endif 6298 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows) 6299 ip->ip_len = ntohs(ip->ip_len); 6300 #endif 6301 #if defined(__FreeBSD__) 6302 #if __FreeBSD_version >= 1000000 6303 length = ntohs(ip->ip_len); 6304 #else 6305 length = ip->ip_len + iphlen; 6306 #endif 6307 #elif defined(__APPLE__) 6308 length = ip->ip_len + iphlen; 6309 #elif defined(__Userspace__) 6310 #if defined(__Userspace_os_Linux) || defined(__Userspace_os_Windows) 6311 length = ip->ip_len; 6312 #else 6313 length = ip->ip_len + iphlen; 6314 #endif 6315 #else 6316 length = ip->ip_len; 6317 #endif 6318 /* Validate mbuf chain length with IP payload length. */ 6319 if (SCTP_HEADER_LEN(m) != length) { 6320 SCTPDBG(SCTP_DEBUG_INPUT1, 6321 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6322 SCTP_STAT_INCR(sctps_hdrops); 6323 goto out; 6324 } 6325 /* SCTP does not allow broadcasts or multicasts */ 6326 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6327 goto out; 6328 } 6329 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6330 goto out; 6331 } 6332 ecn_bits = ip->ip_tos; 6333 #if defined(SCTP_WITH_NO_CSUM) 6334 SCTP_STAT_INCR(sctps_recvnocrc); 6335 #else 6336 #if defined(__FreeBSD__) && __FreeBSD_version >= 800000 6337 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6338 SCTP_STAT_INCR(sctps_recvhwcrc); 6339 compute_crc = 0; 6340 } else { 6341 #else 6342 if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) && 6343 ((src.sin_addr.s_addr == dst.sin_addr.s_addr) || 6344 (SCTP_IS_IT_LOOPBACK(m)))) { 6345 SCTP_STAT_INCR(sctps_recvnocrc); 6346 compute_crc = 0; 6347 } else { 6348 #endif 6349 SCTP_STAT_INCR(sctps_recvswcrc); 6350 compute_crc = 1; 6351 } 6352 #endif 6353 sctp_common_input_processing(&m, iphlen, offset, length, 6354 (struct sockaddr *)&src, 6355 (struct sockaddr *)&dst, 6356 sh, ch, 6357 #if !defined(SCTP_WITH_NO_CSUM) 6358 compute_crc, 6359 #endif 6360 ecn_bits, 6361 #if defined(__FreeBSD__) 6362 use_mflowid, mflowid, 6363 #endif 6364 vrf_id, port); 6365 out: 6366 if (m) { 6367 sctp_m_freem(m); 6368 } 6369 return; 6370 } 6371 6372 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6373 extern int *sctp_cpuarry; 6374 #endif 6375 6376 void 6377 sctp_input(struct mbuf *m, int off) 6378 { 6379 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6380 struct ip *ip; 6381 struct sctphdr *sh; 6382 int offset; 6383 int cpu_to_use; 6384 uint32_t flowid, tag; 6385 6386 if (mp_ncpus > 1) { 6387 if (m->m_flags & M_FLOWID) { 6388 flowid = m->m_pkthdr.flowid; 6389 } else { 6390 /* No flow id built by lower layers 6391 * fix it so we create one. 6392 */ 6393 offset = off + sizeof(struct sctphdr); 6394 if (SCTP_BUF_LEN(m) < offset) { 6395 if ((m = m_pullup(m, offset)) == NULL) { 6396 SCTP_STAT_INCR(sctps_hdrops); 6397 return; 6398 } 6399 } 6400 ip = mtod(m, struct ip *); 6401 sh = (struct sctphdr *)((caddr_t)ip + off); 6402 tag = htonl(sh->v_tag); 6403 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6404 m->m_pkthdr.flowid = flowid; 6405 m->m_flags |= M_FLOWID; 6406 } 6407 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6408 sctp_queue_to_mcore(m, off, cpu_to_use); 6409 return; 6410 } 6411 #endif 6412 sctp_input_with_port(m, off, 0); 6413 } 6414 #endif 6415 #endif 6416
