1 /*- 2 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 4 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * a) Redistributions of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 12 * b) Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the distribution. 15 * 16 * c) Neither the name of Cisco Systems, Inc. nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 24 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 30 * THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_var.h> 38 #include <netinet/sctp_sysctl.h> 39 #include <netinet/sctp_pcb.h> 40 #include <netinet/sctp_header.h> 41 #include <netinet/sctputil.h> 42 #include <netinet/sctp_output.h> 43 #include <netinet/sctp_input.h> 44 #include <netinet/sctp_auth.h> 45 #include <netinet/sctp_indata.h> 46 #include <netinet/sctp_asconf.h> 47 #include <netinet/sctp_bsd_addr.h> 48 #include <netinet/sctp_timer.h> 49 #include <netinet/sctp_crc32.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 56 57 static void 58 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 59 { 60 struct sctp_nets *net; 61 62 /* 63 * This now not only stops all cookie timers it also stops any INIT 64 * timers as well. This will make sure that the timers are stopped 65 * in all collision cases. 66 */ 67 SCTP_TCB_LOCK_ASSERT(stcb); 68 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 69 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 70 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 71 stcb->sctp_ep, 72 stcb, 73 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 74 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 75 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 76 stcb->sctp_ep, 77 stcb, 78 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 79 } 80 } 81 } 82 83 /* INIT handler */ 84 static void 85 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 86 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 87 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 88 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 89 uint8_t mflowtype, uint32_t mflowid, 90 uint32_t vrf_id, uint16_t port) 91 { 92 struct sctp_init *init; 93 struct mbuf *op_err; 94 95 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 96 (void *)stcb); 97 if (stcb == NULL) { 98 SCTP_INP_RLOCK(inp); 99 } 100 /* validate length */ 101 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 102 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 103 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 104 mflowtype, mflowid, 105 vrf_id, port); 106 if (stcb) 107 *abort_no_unlock = 1; 108 goto outnow; 109 } 110 /* validate parameters */ 111 init = &cp->init; 112 if (init->initiate_tag == 0) { 113 /* protocol error... send abort */ 114 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 115 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 116 mflowtype, mflowid, 117 vrf_id, port); 118 if (stcb) 119 *abort_no_unlock = 1; 120 goto outnow; 121 } 122 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 123 /* invalid parameter... send abort */ 124 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 125 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 126 mflowtype, mflowid, 127 vrf_id, port); 128 if (stcb) 129 *abort_no_unlock = 1; 130 goto outnow; 131 } 132 if (init->num_inbound_streams == 0) { 133 /* protocol error... send abort */ 134 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 135 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 136 mflowtype, mflowid, 137 vrf_id, port); 138 if (stcb) 139 *abort_no_unlock = 1; 140 goto outnow; 141 } 142 if (init->num_outbound_streams == 0) { 143 /* protocol error... send abort */ 144 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 145 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 146 mflowtype, mflowid, 147 vrf_id, port); 148 if (stcb) 149 *abort_no_unlock = 1; 150 goto outnow; 151 } 152 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 153 offset + ntohs(cp->ch.chunk_length))) { 154 /* auth parameter(s) error... send abort */ 155 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 156 "Problem with AUTH parameters"); 157 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 158 mflowtype, mflowid, 159 vrf_id, port); 160 if (stcb) 161 *abort_no_unlock = 1; 162 goto outnow; 163 } 164 /* We are only accepting if we have a listening socket. */ 165 if ((stcb == NULL) && 166 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 167 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 168 (!SCTP_IS_LISTENING(inp)))) { 169 /* 170 * FIX ME ?? What about TCP model and we have a 171 * match/restart case? Actually no fix is needed. the lookup 172 * will always find the existing assoc so stcb would not be 173 * NULL. It may be questionable to do this since we COULD 174 * just send back the INIT-ACK and hope that the app did 175 * accept()'s by the time the COOKIE was sent. But there is 176 * a price to pay for COOKIE generation and I don't want to 177 * pay it on the chance that the app will actually do some 178 * accepts(). The App just looses and should NOT be in this 179 * state :-) 180 */ 181 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 182 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 183 "No listener"); 184 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 185 mflowtype, mflowid, inp->fibnum, 186 vrf_id, port); 187 } 188 goto outnow; 189 } 190 if ((stcb != NULL) && 191 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 192 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 193 sctp_send_shutdown_ack(stcb, NULL); 194 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 195 } else { 196 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 197 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 198 src, dst, sh, cp, 199 mflowtype, mflowid, 200 vrf_id, port); 201 } 202 outnow: 203 if (stcb == NULL) { 204 SCTP_INP_RUNLOCK(inp); 205 } 206 } 207 208 /* 209 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 210 */ 211 212 int 213 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 214 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 215 SCTP_UNUSED 216 #endif 217 ) 218 { 219 int unsent_data; 220 unsigned int i; 221 struct sctp_stream_queue_pending *sp; 222 struct sctp_association *asoc; 223 224 /* 225 * This function returns if any stream has true unsent data on it. 226 * Note that as it looks through it will clean up any places that 227 * have old data that has been sent but left at top of stream queue. 228 */ 229 asoc = &stcb->asoc; 230 unsent_data = 0; 231 SCTP_TCB_SEND_LOCK(stcb); 232 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 233 /* Check to see if some data queued */ 234 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 235 /* sa_ignore FREED_MEMORY */ 236 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 237 if (sp == NULL) { 238 continue; 239 } 240 if ((sp->msg_is_complete) && 241 (sp->length == 0) && 242 (sp->sender_all_done)) { 243 /* 244 * We are doing differed cleanup. Last time 245 * through when we took all the data the 246 * sender_all_done was not set. 247 */ 248 if (sp->put_last_out == 0) { 249 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 250 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 251 sp->sender_all_done, 252 sp->length, 253 sp->msg_is_complete, 254 sp->put_last_out); 255 } 256 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 257 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 258 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 259 if (sp->net) { 260 sctp_free_remote_addr(sp->net); 261 sp->net = NULL; 262 } 263 if (sp->data) { 264 sctp_m_freem(sp->data); 265 sp->data = NULL; 266 } 267 sctp_free_a_strmoq(stcb, sp, so_locked); 268 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 269 unsent_data++; 270 } 271 } else { 272 unsent_data++; 273 } 274 if (unsent_data > 0) { 275 break; 276 } 277 } 278 } 279 SCTP_TCB_SEND_UNLOCK(stcb); 280 return (unsent_data); 281 } 282 283 static int 284 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 285 { 286 struct sctp_init *init; 287 struct sctp_association *asoc; 288 struct sctp_nets *lnet; 289 unsigned int i; 290 291 init = &cp->init; 292 asoc = &stcb->asoc; 293 /* save off parameters */ 294 asoc->peer_vtag = ntohl(init->initiate_tag); 295 asoc->peers_rwnd = ntohl(init->a_rwnd); 296 /* init tsn's */ 297 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 298 299 if (!TAILQ_EMPTY(&asoc->nets)) { 300 /* update any ssthresh's that may have a default */ 301 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 302 lnet->ssthresh = asoc->peers_rwnd; 303 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 304 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 305 } 306 } 307 } 308 SCTP_TCB_SEND_LOCK(stcb); 309 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 310 unsigned int newcnt; 311 struct sctp_stream_out *outs; 312 struct sctp_stream_queue_pending *sp, *nsp; 313 struct sctp_tmit_chunk *chk, *nchk; 314 315 /* abandon the upper streams */ 316 newcnt = ntohs(init->num_inbound_streams); 317 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 318 if (chk->rec.data.sid >= newcnt) { 319 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 320 asoc->send_queue_cnt--; 321 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 322 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 323 #ifdef INVARIANTS 324 } else { 325 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 326 #endif 327 } 328 if (chk->data != NULL) { 329 sctp_free_bufspace(stcb, asoc, chk, 1); 330 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 331 0, chk, SCTP_SO_NOT_LOCKED); 332 if (chk->data) { 333 sctp_m_freem(chk->data); 334 chk->data = NULL; 335 } 336 } 337 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 338 /* sa_ignore FREED_MEMORY */ 339 } 340 } 341 if (asoc->strmout) { 342 for (i = newcnt; i < asoc->pre_open_streams; i++) { 343 outs = &asoc->strmout[i]; 344 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 345 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 346 TAILQ_REMOVE(&outs->outqueue, sp, next); 347 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 348 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 349 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 350 if (sp->data) { 351 sctp_m_freem(sp->data); 352 sp->data = NULL; 353 } 354 if (sp->net) { 355 sctp_free_remote_addr(sp->net); 356 sp->net = NULL; 357 } 358 /* Free the chunk */ 359 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 360 /* sa_ignore FREED_MEMORY */ 361 } 362 outs->state = SCTP_STREAM_CLOSED; 363 } 364 } 365 /* cut back the count */ 366 asoc->pre_open_streams = newcnt; 367 } 368 SCTP_TCB_SEND_UNLOCK(stcb); 369 asoc->streamoutcnt = asoc->pre_open_streams; 370 if (asoc->strmout) { 371 for (i = 0; i < asoc->streamoutcnt; i++) { 372 asoc->strmout[i].state = SCTP_STREAM_OPEN; 373 } 374 } 375 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 376 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 377 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 378 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 379 } 380 /* This is the next one we expect */ 381 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 382 383 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 384 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 385 386 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 387 /* open the requested streams */ 388 389 if (asoc->strmin != NULL) { 390 /* Free the old ones */ 391 for (i = 0; i < asoc->streamincnt; i++) { 392 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 393 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 394 } 395 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 396 } 397 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 398 asoc->streamincnt = ntohs(init->num_outbound_streams); 399 } else { 400 asoc->streamincnt = asoc->max_inbound_streams; 401 } 402 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 403 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 404 if (asoc->strmin == NULL) { 405 /* we didn't get memory for the streams! */ 406 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 407 return (-1); 408 } 409 for (i = 0; i < asoc->streamincnt; i++) { 410 asoc->strmin[i].sid = i; 411 asoc->strmin[i].last_mid_delivered = 0xffffffff; 412 TAILQ_INIT(&asoc->strmin[i].inqueue); 413 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 414 asoc->strmin[i].pd_api_started = 0; 415 asoc->strmin[i].delivery_started = 0; 416 } 417 /* 418 * load_address_from_init will put the addresses into the 419 * association when the COOKIE is processed or the INIT-ACK is 420 * processed. Both types of COOKIE's existing and new call this 421 * routine. It will remove addresses that are no longer in the 422 * association (for the restarting case where addresses are 423 * removed). Up front when the INIT arrives we will discard it if it 424 * is a restart and new addresses have been added. 425 */ 426 /* sa_ignore MEMLEAK */ 427 return (0); 428 } 429 430 /* 431 * INIT-ACK message processing/consumption returns value < 0 on error 432 */ 433 static int 434 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 435 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 436 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 437 struct sctp_nets *net, int *abort_no_unlock, 438 uint8_t mflowtype, uint32_t mflowid, 439 uint32_t vrf_id) 440 { 441 struct sctp_association *asoc; 442 struct mbuf *op_err; 443 int retval, abort_flag; 444 uint32_t initack_limit; 445 int nat_friendly = 0; 446 447 /* First verify that we have no illegal param's */ 448 abort_flag = 0; 449 450 op_err = sctp_arethere_unrecognized_parameters(m, 451 (offset + sizeof(struct sctp_init_chunk)), 452 &abort_flag, (struct sctp_chunkhdr *)cp, &nat_friendly); 453 if (abort_flag) { 454 /* Send an abort and notify peer */ 455 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 456 *abort_no_unlock = 1; 457 return (-1); 458 } 459 asoc = &stcb->asoc; 460 asoc->peer_supports_nat = (uint8_t)nat_friendly; 461 /* process the peer's parameters in the INIT-ACK */ 462 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 463 if (retval < 0) { 464 return (retval); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 470 src, dst, NULL, stcb->asoc.port))) { 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 493 stcb->asoc.local_hmacs); 494 if (op_err) { 495 sctp_queue_op_err(stcb, op_err); 496 /* queuing will steal away the mbuf chain to the out queue */ 497 op_err = NULL; 498 } 499 /* extract the cookie and queue it to "echo" it back... */ 500 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 501 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 502 stcb->asoc.overall_error_count, 503 0, 504 SCTP_FROM_SCTP_INPUT, 505 __LINE__); 506 } 507 stcb->asoc.overall_error_count = 0; 508 net->error_count = 0; 509 510 /* 511 * Cancel the INIT timer, We do this first before queueing the 512 * cookie. We always cancel at the primary to assue that we are 513 * canceling the timer started by the INIT which always goes to the 514 * primary. 515 */ 516 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 517 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 518 519 /* calculate the RTO */ 520 net->RTO = sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 521 SCTP_RTT_FROM_NON_DATA); 522 retval = sctp_send_cookie_echo(m, offset, stcb, net); 523 if (retval < 0) { 524 /* 525 * No cookie, we probably should send a op error. But in any 526 * case if there is no cookie in the INIT-ACK, we can 527 * abandon the peer, its broke. 528 */ 529 if (retval == -3) { 530 uint16_t len; 531 532 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 533 /* We abort with an error of missing mandatory param */ 534 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 535 if (op_err != NULL) { 536 struct sctp_error_missing_param *cause; 537 538 SCTP_BUF_LEN(op_err) = len; 539 cause = mtod(op_err, struct sctp_error_missing_param *); 540 /* Subtract the reserved param */ 541 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 542 cause->cause.length = htons(len); 543 cause->num_missing_params = htonl(1); 544 cause->type[0] = htons(SCTP_STATE_COOKIE); 545 } 546 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 547 src, dst, sh, op_err, 548 mflowtype, mflowid, 549 vrf_id, net->port); 550 *abort_no_unlock = 1; 551 } 552 return (retval); 553 } 554 return (0); 555 } 556 557 static void 558 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 559 struct sctp_tcb *stcb, struct sctp_nets *net) 560 { 561 union sctp_sockstore store; 562 struct sctp_nets *r_net, *f_net; 563 struct timeval tv; 564 int req_prim = 0; 565 uint16_t old_error_counter; 566 567 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 568 /* Invalid length */ 569 return; 570 } 571 memset(&store, 0, sizeof(store)); 572 switch (cp->heartbeat.hb_info.addr_family) { 573 #ifdef INET 574 case AF_INET: 575 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 576 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 577 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 578 store.sin.sin_port = stcb->rport; 579 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 580 sizeof(store.sin.sin_addr)); 581 } else { 582 return; 583 } 584 break; 585 #endif 586 #ifdef INET6 587 case AF_INET6: 588 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 589 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 590 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 591 store.sin6.sin6_port = stcb->rport; 592 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 593 } else { 594 return; 595 } 596 break; 597 #endif 598 default: 599 return; 600 } 601 r_net = sctp_findnet(stcb, &store.sa); 602 if (r_net == NULL) { 603 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 604 return; 605 } 606 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 607 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 608 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 609 /* 610 * If the its a HB and it's random value is correct when can 611 * confirm the destination. 612 */ 613 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 614 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 615 stcb->asoc.primary_destination = r_net; 616 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 617 f_net = TAILQ_FIRST(&stcb->asoc.nets); 618 if (f_net != r_net) { 619 /* 620 * first one on the list is NOT the primary 621 * sctp_cmpaddr() is much more efficient if 622 * the primary is the first on the list, 623 * make it so. 624 */ 625 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 626 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 627 } 628 req_prim = 1; 629 } 630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 631 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 632 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 633 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 634 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 635 } 636 old_error_counter = r_net->error_count; 637 r_net->error_count = 0; 638 r_net->hb_responded = 1; 639 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 640 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 641 /* Now lets do a RTO with this */ 642 r_net->RTO = sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 643 SCTP_RTT_FROM_NON_DATA); 644 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 645 r_net->dest_state |= SCTP_ADDR_REACHABLE; 646 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 647 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 648 } 649 if (r_net->dest_state & SCTP_ADDR_PF) { 650 r_net->dest_state &= ~SCTP_ADDR_PF; 651 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 652 } 653 if (old_error_counter > 0) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 655 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 656 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 657 } 658 if (r_net == stcb->asoc.primary_destination) { 659 if (stcb->asoc.alternate) { 660 /* release the alternate, primary is good */ 661 sctp_free_remote_addr(stcb->asoc.alternate); 662 stcb->asoc.alternate = NULL; 663 } 664 } 665 /* Mobility adaptation */ 666 if (req_prim) { 667 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 668 SCTP_MOBILITY_BASE) || 669 sctp_is_mobility_feature_on(stcb->sctp_ep, 670 SCTP_MOBILITY_FASTHANDOFF)) && 671 sctp_is_mobility_feature_on(stcb->sctp_ep, 672 SCTP_MOBILITY_PRIM_DELETED)) { 673 674 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 675 stcb->sctp_ep, stcb, NULL, 676 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 677 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 678 SCTP_MOBILITY_FASTHANDOFF)) { 679 sctp_assoc_immediate_retrans(stcb, 680 stcb->asoc.primary_destination); 681 } 682 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 683 SCTP_MOBILITY_BASE)) { 684 sctp_move_chunks_from_net(stcb, 685 stcb->asoc.deleted_primary); 686 } 687 sctp_delete_prim_timer(stcb->sctp_ep, stcb, 688 stcb->asoc.deleted_primary); 689 } 690 } 691 } 692 693 static int 694 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 695 { 696 /* 697 * return 0 means we want you to proceed with the abort non-zero 698 * means no abort processing 699 */ 700 struct sctpasochead *head; 701 702 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) || 703 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 704 atomic_add_int(&stcb->asoc.refcnt, 1); 705 SCTP_TCB_UNLOCK(stcb); 706 SCTP_INP_INFO_WLOCK(); 707 SCTP_TCB_LOCK(stcb); 708 atomic_subtract_int(&stcb->asoc.refcnt, 1); 709 } 710 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_WAIT) { 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 714 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 715 /* 716 * put it in the bucket in the vtag hash of assoc's for the 717 * system 718 */ 719 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 720 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 721 SCTP_INP_INFO_WUNLOCK(); 722 return (1); 723 } 724 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) { 725 /* 726 * treat like a case where the cookie expired i.e.: - dump 727 * current cookie. - generate a new vtag. - resend init. 728 */ 729 /* generate a new vtag and send init */ 730 LIST_REMOVE(stcb, sctp_asocs); 731 stcb->asoc.state &= ~SCTP_STATE_COOKIE_ECHOED; 732 stcb->asoc.state |= SCTP_STATE_COOKIE_WAIT; 733 sctp_stop_all_cookie_timers(stcb); 734 sctp_toss_old_cookies(stcb, &stcb->asoc); 735 stcb->asoc.my_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 736 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 737 /* 738 * put it in the bucket in the vtag hash of assoc's for the 739 * system 740 */ 741 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 742 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 743 SCTP_INP_INFO_WUNLOCK(); 744 return (1); 745 } 746 return (0); 747 } 748 749 static int 750 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 751 struct sctp_nets *net) 752 { 753 /* 754 * return 0 means we want you to proceed with the abort non-zero 755 * means no abort processing 756 */ 757 if (stcb->asoc.auth_supported == 0) { 758 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 759 return (0); 760 } 761 sctp_asconf_send_nat_state_update(stcb, net); 762 return (1); 763 } 764 765 766 static void 767 sctp_handle_abort(struct sctp_abort_chunk *abort, 768 struct sctp_tcb *stcb, struct sctp_nets *net) 769 { 770 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 771 struct socket *so; 772 #endif 773 uint16_t len; 774 uint16_t error; 775 776 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 777 if (stcb == NULL) 778 return; 779 780 len = ntohs(abort->ch.chunk_length); 781 if (len > sizeof(struct sctp_chunkhdr)) { 782 /* 783 * Need to check the cause codes for our two magic nat 784 * aborts which don't kill the assoc necessarily. 785 */ 786 struct sctp_gen_error_cause *cause; 787 788 cause = (struct sctp_gen_error_cause *)(abort + 1); 789 error = ntohs(cause->code); 790 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 791 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 792 abort->ch.chunk_flags); 793 if (sctp_handle_nat_colliding_state(stcb)) { 794 return; 795 } 796 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 797 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 798 abort->ch.chunk_flags); 799 if (sctp_handle_nat_missing_state(stcb, net)) { 800 return; 801 } 802 } 803 } else { 804 error = 0; 805 } 806 /* stop any receive timers */ 807 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, net, 808 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 809 /* notify user of the abort and clean up... */ 810 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 811 /* free the tcb */ 812 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 813 if ((SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_OPEN) || 814 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 815 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 816 } 817 #ifdef SCTP_ASOCLOG_OF_TSNS 818 sctp_print_out_track_log(stcb); 819 #endif 820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 821 so = SCTP_INP_SO(stcb->sctp_ep); 822 atomic_add_int(&stcb->asoc.refcnt, 1); 823 SCTP_TCB_UNLOCK(stcb); 824 SCTP_SOCKET_LOCK(so, 1); 825 SCTP_TCB_LOCK(stcb); 826 atomic_subtract_int(&stcb->asoc.refcnt, 1); 827 #endif 828 stcb->asoc.state |= SCTP_STATE_WAS_ABORTED; 829 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 830 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 831 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 832 SCTP_SOCKET_UNLOCK(so, 1); 833 #endif 834 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 835 } 836 837 static void 838 sctp_start_net_timers(struct sctp_tcb *stcb) 839 { 840 uint32_t cnt_hb_sent; 841 struct sctp_nets *net; 842 843 cnt_hb_sent = 0; 844 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 845 /* 846 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 847 * If the dest in unconfirmed send a hb as well if under 848 * max_hb_burst have been sent. 849 */ 850 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 851 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 852 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 853 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 854 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 855 cnt_hb_sent++; 856 } 857 } 858 if (cnt_hb_sent) { 859 sctp_chunk_output(stcb->sctp_ep, stcb, 860 SCTP_OUTPUT_FROM_COOKIE_ACK, 861 SCTP_SO_NOT_LOCKED); 862 } 863 } 864 865 866 static void 867 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 868 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 869 { 870 struct sctp_association *asoc; 871 int some_on_streamwheel; 872 int old_state; 873 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 874 struct socket *so; 875 #endif 876 877 SCTPDBG(SCTP_DEBUG_INPUT2, 878 "sctp_handle_shutdown: handling SHUTDOWN\n"); 879 if (stcb == NULL) 880 return; 881 asoc = &stcb->asoc; 882 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 883 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 884 return; 885 } 886 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 887 /* Shutdown NOT the expected size */ 888 return; 889 } 890 old_state = SCTP_GET_STATE(asoc); 891 sctp_update_acked(stcb, cp, abort_flag); 892 if (*abort_flag) { 893 return; 894 } 895 if (asoc->control_pdapi) { 896 /* 897 * With a normal shutdown we assume the end of last record. 898 */ 899 SCTP_INP_READ_LOCK(stcb->sctp_ep); 900 if (asoc->control_pdapi->on_strm_q) { 901 struct sctp_stream_in *strm; 902 903 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 904 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 905 /* Unordered */ 906 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 907 asoc->control_pdapi->on_strm_q = 0; 908 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 909 /* Ordered */ 910 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 911 asoc->control_pdapi->on_strm_q = 0; 912 #ifdef INVARIANTS 913 } else { 914 panic("Unknown state on ctrl:%p on_strm_q:%d", 915 asoc->control_pdapi, 916 asoc->control_pdapi->on_strm_q); 917 #endif 918 } 919 } 920 asoc->control_pdapi->end_added = 1; 921 asoc->control_pdapi->pdapi_aborted = 1; 922 asoc->control_pdapi = NULL; 923 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 924 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 925 so = SCTP_INP_SO(stcb->sctp_ep); 926 atomic_add_int(&stcb->asoc.refcnt, 1); 927 SCTP_TCB_UNLOCK(stcb); 928 SCTP_SOCKET_LOCK(so, 1); 929 SCTP_TCB_LOCK(stcb); 930 atomic_subtract_int(&stcb->asoc.refcnt, 1); 931 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 932 /* assoc was freed while we were unlocked */ 933 SCTP_SOCKET_UNLOCK(so, 1); 934 return; 935 } 936 #endif 937 if (stcb->sctp_socket) { 938 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 939 } 940 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 941 SCTP_SOCKET_UNLOCK(so, 1); 942 #endif 943 } 944 /* goto SHUTDOWN_RECEIVED state to block new requests */ 945 if (stcb->sctp_socket) { 946 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 947 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 948 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 949 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_RECEIVED); 950 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 951 /* 952 * notify upper layer that peer has initiated a 953 * shutdown 954 */ 955 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 956 957 /* reset time */ 958 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 959 } 960 } 961 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { 962 /* 963 * stop the shutdown timer, since we WILL move to 964 * SHUTDOWN-ACK-SENT. 965 */ 966 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 967 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 968 } 969 /* Now is there unsent data on a stream somewhere? */ 970 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 971 972 if (!TAILQ_EMPTY(&asoc->send_queue) || 973 !TAILQ_EMPTY(&asoc->sent_queue) || 974 some_on_streamwheel) { 975 /* By returning we will push more data out */ 976 return; 977 } else { 978 /* no outstanding data to send, so move on... */ 979 /* send SHUTDOWN-ACK */ 980 /* move to SHUTDOWN-ACK-SENT state */ 981 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || 982 (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 983 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 984 } 985 SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); 986 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 987 SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); 988 sctp_stop_timers_for_shutdown(stcb); 989 sctp_send_shutdown_ack(stcb, net); 990 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 991 stcb->sctp_ep, stcb, net); 992 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 993 sctp_send_shutdown_ack(stcb, net); 994 } 995 } 996 } 997 998 static void 999 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1000 struct sctp_tcb *stcb, 1001 struct sctp_nets *net) 1002 { 1003 struct sctp_association *asoc; 1004 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1005 struct socket *so; 1006 1007 so = SCTP_INP_SO(stcb->sctp_ep); 1008 #endif 1009 SCTPDBG(SCTP_DEBUG_INPUT2, 1010 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1011 if (stcb == NULL) 1012 return; 1013 1014 asoc = &stcb->asoc; 1015 /* process according to association state */ 1016 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_WAIT) || 1017 (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED)) { 1018 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1019 sctp_send_shutdown_complete(stcb, net, 1); 1020 SCTP_TCB_UNLOCK(stcb); 1021 return; 1022 } 1023 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) && 1024 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1025 /* unexpected SHUTDOWN-ACK... so ignore... */ 1026 SCTP_TCB_UNLOCK(stcb); 1027 return; 1028 } 1029 if (asoc->control_pdapi) { 1030 /* 1031 * With a normal shutdown we assume the end of last record. 1032 */ 1033 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1034 asoc->control_pdapi->end_added = 1; 1035 asoc->control_pdapi->pdapi_aborted = 1; 1036 asoc->control_pdapi = NULL; 1037 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1038 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1039 atomic_add_int(&stcb->asoc.refcnt, 1); 1040 SCTP_TCB_UNLOCK(stcb); 1041 SCTP_SOCKET_LOCK(so, 1); 1042 SCTP_TCB_LOCK(stcb); 1043 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1044 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1045 /* assoc was freed while we were unlocked */ 1046 SCTP_SOCKET_UNLOCK(so, 1); 1047 return; 1048 } 1049 #endif 1050 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1051 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1052 SCTP_SOCKET_UNLOCK(so, 1); 1053 #endif 1054 } 1055 #ifdef INVARIANTS 1056 if (!TAILQ_EMPTY(&asoc->send_queue) || 1057 !TAILQ_EMPTY(&asoc->sent_queue) || 1058 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1059 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1060 } 1061 #endif 1062 /* stop the timer */ 1063 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1064 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1065 /* send SHUTDOWN-COMPLETE */ 1066 sctp_send_shutdown_complete(stcb, net, 0); 1067 /* notify upper layer protocol */ 1068 if (stcb->sctp_socket) { 1069 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1070 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1071 stcb->sctp_socket->so_snd.sb_cc = 0; 1072 } 1073 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1074 } 1075 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1076 /* free the TCB but first save off the ep */ 1077 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1078 atomic_add_int(&stcb->asoc.refcnt, 1); 1079 SCTP_TCB_UNLOCK(stcb); 1080 SCTP_SOCKET_LOCK(so, 1); 1081 SCTP_TCB_LOCK(stcb); 1082 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1083 #endif 1084 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1085 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1086 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1087 SCTP_SOCKET_UNLOCK(so, 1); 1088 #endif 1089 } 1090 1091 /* 1092 * Skip past the param header and then we will find the chunk that caused the 1093 * problem. There are two possibilities ASCONF or FWD-TSN other than that and 1094 * our peer must be broken. 1095 */ 1096 static void 1097 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr, 1098 struct sctp_nets *net) 1099 { 1100 struct sctp_chunkhdr *chk; 1101 1102 chk = (struct sctp_chunkhdr *)((caddr_t)phdr + sizeof(*phdr)); 1103 switch (chk->chunk_type) { 1104 case SCTP_ASCONF_ACK: 1105 case SCTP_ASCONF: 1106 sctp_asconf_cleanup(stcb, net); 1107 break; 1108 case SCTP_IFORWARD_CUM_TSN: 1109 case SCTP_FORWARD_CUM_TSN: 1110 stcb->asoc.prsctp_supported = 0; 1111 break; 1112 default: 1113 SCTPDBG(SCTP_DEBUG_INPUT2, 1114 "Peer does not support chunk type %d(%x)??\n", 1115 chk->chunk_type, (uint32_t)chk->chunk_type); 1116 break; 1117 } 1118 } 1119 1120 /* 1121 * Skip past the param header and then we will find the param that caused the 1122 * problem. There are a number of param's in a ASCONF OR the prsctp param 1123 * these will turn of specific features. 1124 * XXX: Is this the right thing to do? 1125 */ 1126 static void 1127 sctp_process_unrecog_param(struct sctp_tcb *stcb, struct sctp_paramhdr *phdr) 1128 { 1129 struct sctp_paramhdr *pbad; 1130 1131 pbad = phdr + 1; 1132 switch (ntohs(pbad->param_type)) { 1133 /* pr-sctp draft */ 1134 case SCTP_PRSCTP_SUPPORTED: 1135 stcb->asoc.prsctp_supported = 0; 1136 break; 1137 case SCTP_SUPPORTED_CHUNK_EXT: 1138 break; 1139 /* draft-ietf-tsvwg-addip-sctp */ 1140 case SCTP_HAS_NAT_SUPPORT: 1141 stcb->asoc.peer_supports_nat = 0; 1142 break; 1143 case SCTP_ADD_IP_ADDRESS: 1144 case SCTP_DEL_IP_ADDRESS: 1145 case SCTP_SET_PRIM_ADDR: 1146 stcb->asoc.asconf_supported = 0; 1147 break; 1148 case SCTP_SUCCESS_REPORT: 1149 case SCTP_ERROR_CAUSE_IND: 1150 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1151 SCTPDBG(SCTP_DEBUG_INPUT2, 1152 "Turning off ASCONF to this strange peer\n"); 1153 stcb->asoc.asconf_supported = 0; 1154 break; 1155 default: 1156 SCTPDBG(SCTP_DEBUG_INPUT2, 1157 "Peer does not support param type %d(%x)??\n", 1158 pbad->param_type, (uint32_t)pbad->param_type); 1159 break; 1160 } 1161 } 1162 1163 static int 1164 sctp_handle_error(struct sctp_chunkhdr *ch, 1165 struct sctp_tcb *stcb, struct sctp_nets *net) 1166 { 1167 int chklen; 1168 struct sctp_paramhdr *phdr; 1169 uint16_t error, error_type; 1170 uint16_t error_len; 1171 struct sctp_association *asoc; 1172 int adjust; 1173 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1174 struct socket *so; 1175 #endif 1176 1177 /* parse through all of the errors and process */ 1178 asoc = &stcb->asoc; 1179 phdr = (struct sctp_paramhdr *)((caddr_t)ch + 1180 sizeof(struct sctp_chunkhdr)); 1181 chklen = ntohs(ch->chunk_length) - sizeof(struct sctp_chunkhdr); 1182 error = 0; 1183 while ((size_t)chklen >= sizeof(struct sctp_paramhdr)) { 1184 /* Process an Error Cause */ 1185 error_type = ntohs(phdr->param_type); 1186 error_len = ntohs(phdr->param_length); 1187 if ((error_len > chklen) || (error_len == 0)) { 1188 /* invalid param length for this param */ 1189 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in error param- chunk left:%d errorlen:%d\n", 1190 chklen, error_len); 1191 return (0); 1192 } 1193 if (error == 0) { 1194 /* report the first error cause */ 1195 error = error_type; 1196 } 1197 switch (error_type) { 1198 case SCTP_CAUSE_INVALID_STREAM: 1199 case SCTP_CAUSE_MISSING_PARAM: 1200 case SCTP_CAUSE_INVALID_PARAM: 1201 case SCTP_CAUSE_NO_USER_DATA: 1202 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %d back? We have a bug :/ (or do they?)\n", 1203 error_type); 1204 break; 1205 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1206 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 1207 ch->chunk_flags); 1208 if (sctp_handle_nat_colliding_state(stcb)) { 1209 return (0); 1210 } 1211 break; 1212 case SCTP_CAUSE_NAT_MISSING_STATE: 1213 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 1214 ch->chunk_flags); 1215 if (sctp_handle_nat_missing_state(stcb, net)) { 1216 return (0); 1217 } 1218 break; 1219 case SCTP_CAUSE_STALE_COOKIE: 1220 /* 1221 * We only act if we have echoed a cookie and are 1222 * waiting. 1223 */ 1224 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 1225 int *p; 1226 1227 p = (int *)((caddr_t)phdr + sizeof(*phdr)); 1228 /* Save the time doubled */ 1229 asoc->cookie_preserve_req = ntohl(*p) << 1; 1230 asoc->stale_cookie_count++; 1231 if (asoc->stale_cookie_count > 1232 asoc->max_init_times) { 1233 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1234 /* now free the asoc */ 1235 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1236 so = SCTP_INP_SO(stcb->sctp_ep); 1237 atomic_add_int(&stcb->asoc.refcnt, 1); 1238 SCTP_TCB_UNLOCK(stcb); 1239 SCTP_SOCKET_LOCK(so, 1); 1240 SCTP_TCB_LOCK(stcb); 1241 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1242 #endif 1243 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1244 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1245 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1246 SCTP_SOCKET_UNLOCK(so, 1); 1247 #endif 1248 return (-1); 1249 } 1250 /* blast back to INIT state */ 1251 sctp_toss_old_cookies(stcb, &stcb->asoc); 1252 asoc->state &= ~SCTP_STATE_COOKIE_ECHOED; 1253 asoc->state |= SCTP_STATE_COOKIE_WAIT; 1254 sctp_stop_all_cookie_timers(stcb); 1255 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1256 } 1257 break; 1258 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1259 /* 1260 * Nothing we can do here, we don't do hostname 1261 * addresses so if the peer does not like my IPv6 1262 * (or IPv4 for that matter) it does not matter. If 1263 * they don't support that type of address, they can 1264 * NOT possibly get that packet type... i.e. with no 1265 * IPv6 you can't receive a IPv6 packet. so we can 1266 * safely ignore this one. If we ever added support 1267 * for HOSTNAME Addresses, then we would need to do 1268 * something here. 1269 */ 1270 break; 1271 case SCTP_CAUSE_UNRECOG_CHUNK: 1272 sctp_process_unrecog_chunk(stcb, phdr, net); 1273 break; 1274 case SCTP_CAUSE_UNRECOG_PARAM: 1275 sctp_process_unrecog_param(stcb, phdr); 1276 break; 1277 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1278 /* 1279 * We ignore this since the timer will drive out a 1280 * new cookie anyway and there timer will drive us 1281 * to send a SHUTDOWN_COMPLETE. We can't send one 1282 * here since we don't have their tag. 1283 */ 1284 break; 1285 case SCTP_CAUSE_DELETING_LAST_ADDR: 1286 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1287 case SCTP_CAUSE_DELETING_SRC_ADDR: 1288 /* 1289 * We should NOT get these here, but in a 1290 * ASCONF-ACK. 1291 */ 1292 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a Operational Error?<%d>?\n", 1293 error_type); 1294 break; 1295 case SCTP_CAUSE_OUT_OF_RESC: 1296 /* 1297 * And what, pray tell do we do with the fact that 1298 * the peer is out of resources? Not really sure we 1299 * could do anything but abort. I suspect this 1300 * should have came WITH an abort instead of in a 1301 * OP-ERROR. 1302 */ 1303 break; 1304 default: 1305 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown error type = 0x%xh\n", 1306 error_type); 1307 break; 1308 } 1309 adjust = SCTP_SIZE32(error_len); 1310 chklen -= adjust; 1311 phdr = (struct sctp_paramhdr *)((caddr_t)phdr + adjust); 1312 } 1313 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, error, ch, SCTP_SO_NOT_LOCKED); 1314 return (0); 1315 } 1316 1317 static int 1318 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1319 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1320 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1321 struct sctp_nets *net, int *abort_no_unlock, 1322 uint8_t mflowtype, uint32_t mflowid, 1323 uint32_t vrf_id) 1324 { 1325 struct sctp_init_ack *init_ack; 1326 struct mbuf *op_err; 1327 1328 SCTPDBG(SCTP_DEBUG_INPUT2, 1329 "sctp_handle_init_ack: handling INIT-ACK\n"); 1330 1331 if (stcb == NULL) { 1332 SCTPDBG(SCTP_DEBUG_INPUT2, 1333 "sctp_handle_init_ack: TCB is null\n"); 1334 return (-1); 1335 } 1336 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1337 /* Invalid length */ 1338 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1339 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1340 src, dst, sh, op_err, 1341 mflowtype, mflowid, 1342 vrf_id, net->port); 1343 *abort_no_unlock = 1; 1344 return (-1); 1345 } 1346 init_ack = &cp->init; 1347 /* validate parameters */ 1348 if (init_ack->initiate_tag == 0) { 1349 /* protocol error... send an abort */ 1350 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1351 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1352 src, dst, sh, op_err, 1353 mflowtype, mflowid, 1354 vrf_id, net->port); 1355 *abort_no_unlock = 1; 1356 return (-1); 1357 } 1358 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1359 /* protocol error... send an abort */ 1360 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1361 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1362 src, dst, sh, op_err, 1363 mflowtype, mflowid, 1364 vrf_id, net->port); 1365 *abort_no_unlock = 1; 1366 return (-1); 1367 } 1368 if (init_ack->num_inbound_streams == 0) { 1369 /* protocol error... send an abort */ 1370 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1371 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1372 src, dst, sh, op_err, 1373 mflowtype, mflowid, 1374 vrf_id, net->port); 1375 *abort_no_unlock = 1; 1376 return (-1); 1377 } 1378 if (init_ack->num_outbound_streams == 0) { 1379 /* protocol error... send an abort */ 1380 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1381 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1382 src, dst, sh, op_err, 1383 mflowtype, mflowid, 1384 vrf_id, net->port); 1385 *abort_no_unlock = 1; 1386 return (-1); 1387 } 1388 /* process according to association state... */ 1389 switch (stcb->asoc.state & SCTP_STATE_MASK) { 1390 case SCTP_STATE_COOKIE_WAIT: 1391 /* this is the expected state for this chunk */ 1392 /* process the INIT-ACK parameters */ 1393 if (stcb->asoc.primary_destination->dest_state & 1394 SCTP_ADDR_UNCONFIRMED) { 1395 /* 1396 * The primary is where we sent the INIT, we can 1397 * always consider it confirmed when the INIT-ACK is 1398 * returned. Do this before we load addresses 1399 * though. 1400 */ 1401 stcb->asoc.primary_destination->dest_state &= 1402 ~SCTP_ADDR_UNCONFIRMED; 1403 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1404 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1405 } 1406 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1407 net, abort_no_unlock, 1408 mflowtype, mflowid, 1409 vrf_id) < 0) { 1410 /* error in parsing parameters */ 1411 return (-1); 1412 } 1413 /* update our state */ 1414 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1415 SCTP_SET_STATE(&stcb->asoc, SCTP_STATE_COOKIE_ECHOED); 1416 1417 /* reset the RTO calc */ 1418 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1419 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1420 stcb->asoc.overall_error_count, 1421 0, 1422 SCTP_FROM_SCTP_INPUT, 1423 __LINE__); 1424 } 1425 stcb->asoc.overall_error_count = 0; 1426 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1427 /* 1428 * collapse the init timer back in case of a exponential 1429 * backoff 1430 */ 1431 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1432 stcb, net); 1433 /* 1434 * the send at the end of the inbound data processing will 1435 * cause the cookie to be sent 1436 */ 1437 break; 1438 case SCTP_STATE_SHUTDOWN_SENT: 1439 /* incorrect state... discard */ 1440 break; 1441 case SCTP_STATE_COOKIE_ECHOED: 1442 /* incorrect state... discard */ 1443 break; 1444 case SCTP_STATE_OPEN: 1445 /* incorrect state... discard */ 1446 break; 1447 case SCTP_STATE_EMPTY: 1448 case SCTP_STATE_INUSE: 1449 default: 1450 /* incorrect state... discard */ 1451 return (-1); 1452 break; 1453 } 1454 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1455 return (0); 1456 } 1457 1458 static struct sctp_tcb * 1459 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1460 struct sockaddr *src, struct sockaddr *dst, 1461 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1462 struct sctp_inpcb *inp, struct sctp_nets **netp, 1463 struct sockaddr *init_src, int *notification, 1464 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1465 uint8_t mflowtype, uint32_t mflowid, 1466 uint32_t vrf_id, uint16_t port); 1467 1468 1469 /* 1470 * handle a state cookie for an existing association m: input packet mbuf 1471 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1472 * "split" mbuf and the cookie signature does not exist offset: offset into 1473 * mbuf to the cookie-echo chunk 1474 */ 1475 static struct sctp_tcb * 1476 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1477 struct sockaddr *src, struct sockaddr *dst, 1478 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1479 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1480 struct sockaddr *init_src, int *notification, 1481 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1482 uint8_t mflowtype, uint32_t mflowid, 1483 uint32_t vrf_id, uint16_t port) 1484 { 1485 struct sctp_association *asoc; 1486 struct sctp_init_chunk *init_cp, init_buf; 1487 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1488 struct sctp_nets *net; 1489 struct mbuf *op_err; 1490 struct timeval old; 1491 int init_offset, initack_offset, i; 1492 int retval; 1493 int spec_flag = 0; 1494 uint32_t how_indx; 1495 #if defined(SCTP_DETAILED_STR_STATS) 1496 int j; 1497 #endif 1498 1499 net = *netp; 1500 /* I know that the TCB is non-NULL from the caller */ 1501 asoc = &stcb->asoc; 1502 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1503 if (asoc->cookie_how[how_indx] == 0) 1504 break; 1505 } 1506 if (how_indx < sizeof(asoc->cookie_how)) { 1507 asoc->cookie_how[how_indx] = 1; 1508 } 1509 if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1510 /* SHUTDOWN came in after sending INIT-ACK */ 1511 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1512 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1513 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1514 mflowtype, mflowid, inp->fibnum, 1515 vrf_id, net->port); 1516 if (how_indx < sizeof(asoc->cookie_how)) 1517 asoc->cookie_how[how_indx] = 2; 1518 return (NULL); 1519 } 1520 /* 1521 * find and validate the INIT chunk in the cookie (peer's info) the 1522 * INIT should start after the cookie-echo header struct (chunk 1523 * header, state cookie header struct) 1524 */ 1525 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1526 1527 init_cp = (struct sctp_init_chunk *) 1528 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1529 (uint8_t *)&init_buf); 1530 if (init_cp == NULL) { 1531 /* could not pull a INIT chunk in cookie */ 1532 return (NULL); 1533 } 1534 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1535 return (NULL); 1536 } 1537 /* 1538 * find and validate the INIT-ACK chunk in the cookie (my info) the 1539 * INIT-ACK follows the INIT chunk 1540 */ 1541 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1542 initack_cp = (struct sctp_init_ack_chunk *) 1543 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1544 (uint8_t *)&initack_buf); 1545 if (initack_cp == NULL) { 1546 /* could not pull INIT-ACK chunk in cookie */ 1547 return (NULL); 1548 } 1549 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1550 return (NULL); 1551 } 1552 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1553 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1554 /* 1555 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1556 * to get into the OPEN state 1557 */ 1558 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1559 /*- 1560 * Opps, this means that we somehow generated two vtag's 1561 * the same. I.e. we did: 1562 * Us Peer 1563 * <---INIT(tag=a)------ 1564 * ----INIT-ACK(tag=t)--> 1565 * ----INIT(tag=t)------> *1 1566 * <---INIT-ACK(tag=a)--- 1567 * <----CE(tag=t)------------- *2 1568 * 1569 * At point *1 we should be generating a different 1570 * tag t'. Which means we would throw away the CE and send 1571 * ours instead. Basically this is case C (throw away side). 1572 */ 1573 if (how_indx < sizeof(asoc->cookie_how)) 1574 asoc->cookie_how[how_indx] = 17; 1575 return (NULL); 1576 1577 } 1578 switch (SCTP_GET_STATE(asoc)) { 1579 case SCTP_STATE_COOKIE_WAIT: 1580 case SCTP_STATE_COOKIE_ECHOED: 1581 /* 1582 * INIT was sent but got a COOKIE_ECHO with the 1583 * correct tags... just accept it...but we must 1584 * process the init so that we can make sure we have 1585 * the right seq no's. 1586 */ 1587 /* First we must process the INIT !! */ 1588 retval = sctp_process_init(init_cp, stcb); 1589 if (retval < 0) { 1590 if (how_indx < sizeof(asoc->cookie_how)) 1591 asoc->cookie_how[how_indx] = 3; 1592 return (NULL); 1593 } 1594 /* we have already processed the INIT so no problem */ 1595 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1596 stcb, net, 1597 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1598 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1599 stcb, net, 1600 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1601 /* update current state */ 1602 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1603 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1604 else 1605 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1606 1607 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1608 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1609 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1610 stcb->sctp_ep, stcb, asoc->primary_destination); 1611 } 1612 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1613 sctp_stop_all_cookie_timers(stcb); 1614 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1615 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1616 (!SCTP_IS_LISTENING(inp))) { 1617 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1618 struct socket *so; 1619 #endif 1620 /* 1621 * Here is where collision would go if we 1622 * did a connect() and instead got a 1623 * init/init-ack/cookie done before the 1624 * init-ack came back.. 1625 */ 1626 stcb->sctp_ep->sctp_flags |= 1627 SCTP_PCB_FLAGS_CONNECTED; 1628 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1629 so = SCTP_INP_SO(stcb->sctp_ep); 1630 atomic_add_int(&stcb->asoc.refcnt, 1); 1631 SCTP_TCB_UNLOCK(stcb); 1632 SCTP_SOCKET_LOCK(so, 1); 1633 SCTP_TCB_LOCK(stcb); 1634 atomic_add_int(&stcb->asoc.refcnt, -1); 1635 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1636 SCTP_SOCKET_UNLOCK(so, 1); 1637 return (NULL); 1638 } 1639 #endif 1640 soisconnected(stcb->sctp_socket); 1641 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1642 SCTP_SOCKET_UNLOCK(so, 1); 1643 #endif 1644 } 1645 /* notify upper layer */ 1646 *notification = SCTP_NOTIFY_ASSOC_UP; 1647 /* 1648 * since we did not send a HB make sure we don't 1649 * double things 1650 */ 1651 old.tv_sec = cookie->time_entered.tv_sec; 1652 old.tv_usec = cookie->time_entered.tv_usec; 1653 net->hb_responded = 1; 1654 net->RTO = sctp_calculate_rto(stcb, asoc, net, 1655 &old, 1656 SCTP_RTT_FROM_NON_DATA); 1657 1658 if (stcb->asoc.sctp_autoclose_ticks && 1659 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1660 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1661 inp, stcb, NULL); 1662 } 1663 break; 1664 default: 1665 /* 1666 * we're in the OPEN state (or beyond), so peer must 1667 * have simply lost the COOKIE-ACK 1668 */ 1669 break; 1670 } /* end switch */ 1671 sctp_stop_all_cookie_timers(stcb); 1672 /* 1673 * We ignore the return code here.. not sure if we should 1674 * somehow abort.. but we do have an existing asoc. This 1675 * really should not fail. 1676 */ 1677 if (sctp_load_addresses_from_init(stcb, m, 1678 init_offset + sizeof(struct sctp_init_chunk), 1679 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1680 if (how_indx < sizeof(asoc->cookie_how)) 1681 asoc->cookie_how[how_indx] = 4; 1682 return (NULL); 1683 } 1684 /* respond with a COOKIE-ACK */ 1685 sctp_toss_old_cookies(stcb, asoc); 1686 sctp_send_cookie_ack(stcb); 1687 if (how_indx < sizeof(asoc->cookie_how)) 1688 asoc->cookie_how[how_indx] = 5; 1689 return (stcb); 1690 } 1691 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1692 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1693 cookie->tie_tag_my_vtag == 0 && 1694 cookie->tie_tag_peer_vtag == 0) { 1695 /* 1696 * case C in Section 5.2.4 Table 2: XMOO silently discard 1697 */ 1698 if (how_indx < sizeof(asoc->cookie_how)) 1699 asoc->cookie_how[how_indx] = 6; 1700 return (NULL); 1701 } 1702 /* 1703 * If nat support, and the below and stcb is established, send back 1704 * a ABORT(colliding state) if we are established. 1705 */ 1706 if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) && 1707 (asoc->peer_supports_nat) && 1708 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1709 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1710 (asoc->peer_vtag == 0)))) { 1711 /* 1712 * Special case - Peer's support nat. We may have two init's 1713 * that we gave out the same tag on since one was not 1714 * established.. i.e. we get INIT from host-1 behind the nat 1715 * and we respond tag-a, we get a INIT from host-2 behind 1716 * the nat and we get tag-a again. Then we bring up host-1 1717 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1718 * Now we have colliding state. We must send an abort here 1719 * with colliding state indication. 1720 */ 1721 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1722 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1723 mflowtype, mflowid, inp->fibnum, 1724 vrf_id, port); 1725 return (NULL); 1726 } 1727 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1728 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1729 (asoc->peer_vtag == 0))) { 1730 /* 1731 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1732 * should be ok, re-accept peer info 1733 */ 1734 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1735 /* 1736 * Extension of case C. If we hit this, then the 1737 * random number generator returned the same vtag 1738 * when we first sent our INIT-ACK and when we later 1739 * sent our INIT. The side with the seq numbers that 1740 * are different will be the one that normnally 1741 * would have hit case C. This in effect "extends" 1742 * our vtags in this collision case to be 64 bits. 1743 * The same collision could occur aka you get both 1744 * vtag and seq number the same twice in a row.. but 1745 * is much less likely. If it did happen then we 1746 * would proceed through and bring up the assoc.. we 1747 * may end up with the wrong stream setup however.. 1748 * which would be bad.. but there is no way to 1749 * tell.. until we send on a stream that does not 1750 * exist :-) 1751 */ 1752 if (how_indx < sizeof(asoc->cookie_how)) 1753 asoc->cookie_how[how_indx] = 7; 1754 1755 return (NULL); 1756 } 1757 if (how_indx < sizeof(asoc->cookie_how)) 1758 asoc->cookie_how[how_indx] = 8; 1759 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1760 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1761 sctp_stop_all_cookie_timers(stcb); 1762 /* 1763 * since we did not send a HB make sure we don't double 1764 * things 1765 */ 1766 net->hb_responded = 1; 1767 if (stcb->asoc.sctp_autoclose_ticks && 1768 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1769 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1770 NULL); 1771 } 1772 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1773 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1774 1775 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1776 /* 1777 * Ok the peer probably discarded our data (if we 1778 * echoed a cookie+data). So anything on the 1779 * sent_queue should be marked for retransmit, we 1780 * may not get something to kick us so it COULD 1781 * still take a timeout to move these.. but it can't 1782 * hurt to mark them. 1783 */ 1784 struct sctp_tmit_chunk *chk; 1785 1786 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1787 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1788 chk->sent = SCTP_DATAGRAM_RESEND; 1789 sctp_flight_size_decrease(chk); 1790 sctp_total_flight_decrease(stcb, chk); 1791 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1792 spec_flag++; 1793 } 1794 } 1795 1796 } 1797 /* process the INIT info (peer's info) */ 1798 retval = sctp_process_init(init_cp, stcb); 1799 if (retval < 0) { 1800 if (how_indx < sizeof(asoc->cookie_how)) 1801 asoc->cookie_how[how_indx] = 9; 1802 return (NULL); 1803 } 1804 if (sctp_load_addresses_from_init(stcb, m, 1805 init_offset + sizeof(struct sctp_init_chunk), 1806 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1807 if (how_indx < sizeof(asoc->cookie_how)) 1808 asoc->cookie_how[how_indx] = 10; 1809 return (NULL); 1810 } 1811 if ((asoc->state & SCTP_STATE_COOKIE_WAIT) || 1812 (asoc->state & SCTP_STATE_COOKIE_ECHOED)) { 1813 *notification = SCTP_NOTIFY_ASSOC_UP; 1814 1815 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1816 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1817 (!SCTP_IS_LISTENING(inp))) { 1818 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1819 struct socket *so; 1820 #endif 1821 stcb->sctp_ep->sctp_flags |= 1822 SCTP_PCB_FLAGS_CONNECTED; 1823 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1824 so = SCTP_INP_SO(stcb->sctp_ep); 1825 atomic_add_int(&stcb->asoc.refcnt, 1); 1826 SCTP_TCB_UNLOCK(stcb); 1827 SCTP_SOCKET_LOCK(so, 1); 1828 SCTP_TCB_LOCK(stcb); 1829 atomic_add_int(&stcb->asoc.refcnt, -1); 1830 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1831 SCTP_SOCKET_UNLOCK(so, 1); 1832 return (NULL); 1833 } 1834 #endif 1835 soisconnected(stcb->sctp_socket); 1836 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1837 SCTP_SOCKET_UNLOCK(so, 1); 1838 #endif 1839 } 1840 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) 1841 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1842 else 1843 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1844 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1845 } else if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1846 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1847 } else { 1848 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1849 } 1850 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1851 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1852 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1853 stcb->sctp_ep, stcb, asoc->primary_destination); 1854 } 1855 sctp_stop_all_cookie_timers(stcb); 1856 sctp_toss_old_cookies(stcb, asoc); 1857 sctp_send_cookie_ack(stcb); 1858 if (spec_flag) { 1859 /* 1860 * only if we have retrans set do we do this. What 1861 * this call does is get only the COOKIE-ACK out and 1862 * then when we return the normal call to 1863 * sctp_chunk_output will get the retrans out behind 1864 * this. 1865 */ 1866 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1867 } 1868 if (how_indx < sizeof(asoc->cookie_how)) 1869 asoc->cookie_how[how_indx] = 11; 1870 1871 return (stcb); 1872 } 1873 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1874 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1875 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1876 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1877 cookie->tie_tag_peer_vtag != 0) { 1878 struct sctpasochead *head; 1879 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1880 struct socket *so; 1881 #endif 1882 1883 if (asoc->peer_supports_nat) { 1884 /* 1885 * This is a gross gross hack. Just call the 1886 * cookie_new code since we are allowing a duplicate 1887 * association. I hope this works... 1888 */ 1889 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1890 sh, cookie, cookie_len, 1891 inp, netp, init_src, notification, 1892 auth_skipped, auth_offset, auth_len, 1893 mflowtype, mflowid, 1894 vrf_id, port)); 1895 } 1896 /* 1897 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1898 */ 1899 /* temp code */ 1900 if (how_indx < sizeof(asoc->cookie_how)) 1901 asoc->cookie_how[how_indx] = 12; 1902 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1903 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1904 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1905 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1906 1907 /* notify upper layer */ 1908 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1909 atomic_add_int(&stcb->asoc.refcnt, 1); 1910 if ((SCTP_GET_STATE(asoc) != SCTP_STATE_OPEN) && 1911 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1912 (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT)) { 1913 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1914 } 1915 if (SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) { 1916 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1917 } else if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) { 1918 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1919 } 1920 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1921 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1922 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1923 stcb->sctp_ep, stcb, asoc->primary_destination); 1924 1925 } else if (!(asoc->state & SCTP_STATE_SHUTDOWN_SENT)) { 1926 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1927 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 1928 } 1929 asoc->pre_open_streams = 1930 ntohs(initack_cp->init.num_outbound_streams); 1931 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1932 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1933 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1934 1935 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1936 1937 asoc->str_reset_seq_in = asoc->init_seq_number; 1938 1939 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1940 if (asoc->mapping_array) { 1941 memset(asoc->mapping_array, 0, 1942 asoc->mapping_array_size); 1943 } 1944 if (asoc->nr_mapping_array) { 1945 memset(asoc->nr_mapping_array, 0, 1946 asoc->mapping_array_size); 1947 } 1948 SCTP_TCB_UNLOCK(stcb); 1949 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1950 so = SCTP_INP_SO(stcb->sctp_ep); 1951 SCTP_SOCKET_LOCK(so, 1); 1952 #endif 1953 SCTP_INP_INFO_WLOCK(); 1954 SCTP_INP_WLOCK(stcb->sctp_ep); 1955 SCTP_TCB_LOCK(stcb); 1956 atomic_add_int(&stcb->asoc.refcnt, -1); 1957 /* send up all the data */ 1958 SCTP_TCB_SEND_LOCK(stcb); 1959 1960 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1961 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1962 stcb->asoc.strmout[i].chunks_on_queues = 0; 1963 #if defined(SCTP_DETAILED_STR_STATS) 1964 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1965 asoc->strmout[i].abandoned_sent[j] = 0; 1966 asoc->strmout[i].abandoned_unsent[j] = 0; 1967 } 1968 #else 1969 asoc->strmout[i].abandoned_sent[0] = 0; 1970 asoc->strmout[i].abandoned_unsent[0] = 0; 1971 #endif 1972 stcb->asoc.strmout[i].sid = i; 1973 stcb->asoc.strmout[i].next_mid_ordered = 0; 1974 stcb->asoc.strmout[i].next_mid_unordered = 0; 1975 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1976 } 1977 /* process the INIT-ACK info (my info) */ 1978 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1979 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1980 1981 /* pull from vtag hash */ 1982 LIST_REMOVE(stcb, sctp_asocs); 1983 /* re-insert to new vtag position */ 1984 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1985 SCTP_BASE_INFO(hashasocmark))]; 1986 /* 1987 * put it in the bucket in the vtag hash of assoc's for the 1988 * system 1989 */ 1990 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1991 1992 SCTP_TCB_SEND_UNLOCK(stcb); 1993 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1994 SCTP_INP_INFO_WUNLOCK(); 1995 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1996 SCTP_SOCKET_UNLOCK(so, 1); 1997 #endif 1998 asoc->total_flight = 0; 1999 asoc->total_flight_count = 0; 2000 /* process the INIT info (peer's info) */ 2001 retval = sctp_process_init(init_cp, stcb); 2002 if (retval < 0) { 2003 if (how_indx < sizeof(asoc->cookie_how)) 2004 asoc->cookie_how[how_indx] = 13; 2005 2006 return (NULL); 2007 } 2008 /* 2009 * since we did not send a HB make sure we don't double 2010 * things 2011 */ 2012 net->hb_responded = 1; 2013 2014 if (sctp_load_addresses_from_init(stcb, m, 2015 init_offset + sizeof(struct sctp_init_chunk), 2016 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2017 if (how_indx < sizeof(asoc->cookie_how)) 2018 asoc->cookie_how[how_indx] = 14; 2019 2020 return (NULL); 2021 } 2022 /* respond with a COOKIE-ACK */ 2023 sctp_stop_all_cookie_timers(stcb); 2024 sctp_toss_old_cookies(stcb, asoc); 2025 sctp_send_cookie_ack(stcb); 2026 if (how_indx < sizeof(asoc->cookie_how)) 2027 asoc->cookie_how[how_indx] = 15; 2028 2029 return (stcb); 2030 } 2031 if (how_indx < sizeof(asoc->cookie_how)) 2032 asoc->cookie_how[how_indx] = 16; 2033 /* all other cases... */ 2034 return (NULL); 2035 } 2036 2037 2038 /* 2039 * handle a state cookie for a new association m: input packet mbuf chain-- 2040 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2041 * and the cookie signature does not exist offset: offset into mbuf to the 2042 * cookie-echo chunk length: length of the cookie chunk to: where the init 2043 * was from returns a new TCB 2044 */ 2045 static struct sctp_tcb * 2046 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2047 struct sockaddr *src, struct sockaddr *dst, 2048 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2049 struct sctp_inpcb *inp, struct sctp_nets **netp, 2050 struct sockaddr *init_src, int *notification, 2051 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2052 uint8_t mflowtype, uint32_t mflowid, 2053 uint32_t vrf_id, uint16_t port) 2054 { 2055 struct sctp_tcb *stcb; 2056 struct sctp_init_chunk *init_cp, init_buf; 2057 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2058 union sctp_sockstore store; 2059 struct sctp_association *asoc; 2060 int init_offset, initack_offset, initack_limit; 2061 int retval; 2062 int error = 0; 2063 uint8_t auth_chunk_buf[SCTP_PARAM_BUFFER_SIZE]; 2064 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2065 struct socket *so; 2066 2067 so = SCTP_INP_SO(inp); 2068 #endif 2069 2070 /* 2071 * find and validate the INIT chunk in the cookie (peer's info) the 2072 * INIT should start after the cookie-echo header struct (chunk 2073 * header, state cookie header struct) 2074 */ 2075 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2076 init_cp = (struct sctp_init_chunk *) 2077 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2078 (uint8_t *)&init_buf); 2079 if (init_cp == NULL) { 2080 /* could not pull a INIT chunk in cookie */ 2081 SCTPDBG(SCTP_DEBUG_INPUT1, 2082 "process_cookie_new: could not pull INIT chunk hdr\n"); 2083 return (NULL); 2084 } 2085 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2086 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2087 return (NULL); 2088 } 2089 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2090 /* 2091 * find and validate the INIT-ACK chunk in the cookie (my info) the 2092 * INIT-ACK follows the INIT chunk 2093 */ 2094 initack_cp = (struct sctp_init_ack_chunk *) 2095 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2096 (uint8_t *)&initack_buf); 2097 if (initack_cp == NULL) { 2098 /* could not pull INIT-ACK chunk in cookie */ 2099 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2100 return (NULL); 2101 } 2102 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2103 return (NULL); 2104 } 2105 /* 2106 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2107 * "initack_limit" value. This is because the chk_length field 2108 * includes the length of the cookie, but the cookie is omitted when 2109 * the INIT and INIT_ACK are tacked onto the cookie... 2110 */ 2111 initack_limit = offset + cookie_len; 2112 2113 /* 2114 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2115 * and popluate 2116 */ 2117 2118 /* 2119 * Here we do a trick, we set in NULL for the proc/thread argument. 2120 * We do this since in effect we only use the p argument when the 2121 * socket is unbound and we must do an implicit bind. Since we are 2122 * getting a cookie, we cannot be unbound. 2123 */ 2124 stcb = sctp_aloc_assoc(inp, init_src, &error, 2125 ntohl(initack_cp->init.initiate_tag), vrf_id, 2126 ntohs(initack_cp->init.num_outbound_streams), 2127 port, 2128 (struct thread *)NULL 2129 ); 2130 if (stcb == NULL) { 2131 struct mbuf *op_err; 2132 2133 /* memory problem? */ 2134 SCTPDBG(SCTP_DEBUG_INPUT1, 2135 "process_cookie_new: no room for another TCB!\n"); 2136 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2137 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2138 src, dst, sh, op_err, 2139 mflowtype, mflowid, 2140 vrf_id, port); 2141 return (NULL); 2142 } 2143 /* get the correct sctp_nets */ 2144 if (netp) 2145 *netp = sctp_findnet(stcb, init_src); 2146 2147 asoc = &stcb->asoc; 2148 /* get scope variables out of cookie */ 2149 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2150 asoc->scope.site_scope = cookie->site_scope; 2151 asoc->scope.local_scope = cookie->local_scope; 2152 asoc->scope.loopback_scope = cookie->loopback_scope; 2153 2154 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2155 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2156 struct mbuf *op_err; 2157 2158 /* 2159 * Houston we have a problem. The EP changed while the 2160 * cookie was in flight. Only recourse is to abort the 2161 * association. 2162 */ 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 mflowtype, mflowid, 2167 vrf_id, port); 2168 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2169 atomic_add_int(&stcb->asoc.refcnt, 1); 2170 SCTP_TCB_UNLOCK(stcb); 2171 SCTP_SOCKET_LOCK(so, 1); 2172 SCTP_TCB_LOCK(stcb); 2173 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2174 #endif 2175 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2176 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2177 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2178 SCTP_SOCKET_UNLOCK(so, 1); 2179 #endif 2180 return (NULL); 2181 } 2182 /* process the INIT-ACK info (my info) */ 2183 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2184 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2185 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2186 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2187 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2188 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2189 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2190 asoc->str_reset_seq_in = asoc->init_seq_number; 2191 2192 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2193 2194 /* process the INIT info (peer's info) */ 2195 if (netp) 2196 retval = sctp_process_init(init_cp, stcb); 2197 else 2198 retval = 0; 2199 if (retval < 0) { 2200 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2201 atomic_add_int(&stcb->asoc.refcnt, 1); 2202 SCTP_TCB_UNLOCK(stcb); 2203 SCTP_SOCKET_LOCK(so, 1); 2204 SCTP_TCB_LOCK(stcb); 2205 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2206 #endif 2207 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2208 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2209 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2210 SCTP_SOCKET_UNLOCK(so, 1); 2211 #endif 2212 return (NULL); 2213 } 2214 /* load all addresses */ 2215 if (sctp_load_addresses_from_init(stcb, m, 2216 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2217 src, dst, init_src, port)) { 2218 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2219 atomic_add_int(&stcb->asoc.refcnt, 1); 2220 SCTP_TCB_UNLOCK(stcb); 2221 SCTP_SOCKET_LOCK(so, 1); 2222 SCTP_TCB_LOCK(stcb); 2223 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2224 #endif 2225 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2226 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2228 SCTP_SOCKET_UNLOCK(so, 1); 2229 #endif 2230 return (NULL); 2231 } 2232 /* 2233 * verify any preceding AUTH chunk that was skipped 2234 */ 2235 /* pull the local authentication parameters from the cookie/init-ack */ 2236 sctp_auth_get_cookie_params(stcb, m, 2237 initack_offset + sizeof(struct sctp_init_ack_chunk), 2238 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2239 if (auth_skipped) { 2240 struct sctp_auth_chunk *auth; 2241 2242 auth = (struct sctp_auth_chunk *) 2243 sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2244 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2245 /* auth HMAC failed, dump the assoc and packet */ 2246 SCTPDBG(SCTP_DEBUG_AUTH1, 2247 "COOKIE-ECHO: AUTH failed\n"); 2248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2249 atomic_add_int(&stcb->asoc.refcnt, 1); 2250 SCTP_TCB_UNLOCK(stcb); 2251 SCTP_SOCKET_LOCK(so, 1); 2252 SCTP_TCB_LOCK(stcb); 2253 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2254 #endif 2255 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2256 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2257 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2258 SCTP_SOCKET_UNLOCK(so, 1); 2259 #endif 2260 return (NULL); 2261 } else { 2262 /* remaining chunks checked... good to go */ 2263 stcb->asoc.authenticated = 1; 2264 } 2265 } 2266 /* 2267 * if we're doing ASCONFs, check to see if we have any new local 2268 * addresses that need to get added to the peer (eg. addresses 2269 * changed while cookie echo in flight). This needs to be done 2270 * after we go to the OPEN state to do the correct asconf 2271 * processing. else, make sure we have the correct addresses in our 2272 * lists 2273 */ 2274 2275 /* warning, we re-use sin, sin6, sa_store here! */ 2276 /* pull in local_address (our "from" address) */ 2277 switch (cookie->laddr_type) { 2278 #ifdef INET 2279 case SCTP_IPV4_ADDRESS: 2280 /* source addr is IPv4 */ 2281 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2282 store.sin.sin_family = AF_INET; 2283 store.sin.sin_len = sizeof(struct sockaddr_in); 2284 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2285 break; 2286 #endif 2287 #ifdef INET6 2288 case SCTP_IPV6_ADDRESS: 2289 /* source addr is IPv6 */ 2290 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2291 store.sin6.sin6_family = AF_INET6; 2292 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2293 store.sin6.sin6_scope_id = cookie->scope_id; 2294 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2295 break; 2296 #endif 2297 default: 2298 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2299 atomic_add_int(&stcb->asoc.refcnt, 1); 2300 SCTP_TCB_UNLOCK(stcb); 2301 SCTP_SOCKET_LOCK(so, 1); 2302 SCTP_TCB_LOCK(stcb); 2303 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2304 #endif 2305 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2306 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2307 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2308 SCTP_SOCKET_UNLOCK(so, 1); 2309 #endif 2310 return (NULL); 2311 } 2312 2313 /* update current state */ 2314 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2315 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2316 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2317 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2318 stcb->sctp_ep, stcb, asoc->primary_destination); 2319 } 2320 sctp_stop_all_cookie_timers(stcb); 2321 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2322 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2323 2324 /* set up to notify upper layer */ 2325 *notification = SCTP_NOTIFY_ASSOC_UP; 2326 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2327 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2328 (!SCTP_IS_LISTENING(inp))) { 2329 /* 2330 * This is an endpoint that called connect() how it got a 2331 * cookie that is NEW is a bit of a mystery. It must be that 2332 * the INIT was sent, but before it got there.. a complete 2333 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2334 * should have went to the other code.. not here.. oh well.. 2335 * a bit of protection is worth having.. 2336 */ 2337 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2338 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2339 atomic_add_int(&stcb->asoc.refcnt, 1); 2340 SCTP_TCB_UNLOCK(stcb); 2341 SCTP_SOCKET_LOCK(so, 1); 2342 SCTP_TCB_LOCK(stcb); 2343 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2344 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2345 SCTP_SOCKET_UNLOCK(so, 1); 2346 return (NULL); 2347 } 2348 #endif 2349 soisconnected(stcb->sctp_socket); 2350 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2351 SCTP_SOCKET_UNLOCK(so, 1); 2352 #endif 2353 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2354 (SCTP_IS_LISTENING(inp))) { 2355 /* 2356 * We don't want to do anything with this one. Since it is 2357 * the listening guy. The timer will get started for 2358 * accepted connections in the caller. 2359 */ 2360 ; 2361 } 2362 /* since we did not send a HB make sure we don't double things */ 2363 if ((netp) && (*netp)) 2364 (*netp)->hb_responded = 1; 2365 2366 if (stcb->asoc.sctp_autoclose_ticks && 2367 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2368 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2369 } 2370 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2371 if ((netp != NULL) && (*netp != NULL)) { 2372 struct timeval old; 2373 2374 /* calculate the RTT and set the encaps port */ 2375 old.tv_sec = cookie->time_entered.tv_sec; 2376 old.tv_usec = cookie->time_entered.tv_usec; 2377 (*netp)->RTO = sctp_calculate_rto(stcb, asoc, *netp, 2378 &old, SCTP_RTT_FROM_NON_DATA); 2379 } 2380 /* respond with a COOKIE-ACK */ 2381 sctp_send_cookie_ack(stcb); 2382 2383 /* 2384 * check the address lists for any ASCONFs that need to be sent 2385 * AFTER the cookie-ack is sent 2386 */ 2387 sctp_check_address_list(stcb, m, 2388 initack_offset + sizeof(struct sctp_init_ack_chunk), 2389 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2390 &store.sa, cookie->local_scope, cookie->site_scope, 2391 cookie->ipv4_scope, cookie->loopback_scope); 2392 2393 2394 return (stcb); 2395 } 2396 2397 /* 2398 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2399 * we NEED to make sure we are not already using the vtag. If so we 2400 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2401 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2402 SCTP_BASE_INFO(hashasocmark))]; 2403 LIST_FOREACH(stcb, head, sctp_asocs) { 2404 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2405 -- SEND ABORT - TRY AGAIN -- 2406 } 2407 } 2408 */ 2409 2410 /* 2411 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2412 * existing (non-NULL) TCB 2413 */ 2414 static struct mbuf * 2415 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2416 struct sockaddr *src, struct sockaddr *dst, 2417 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2418 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2419 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2420 struct sctp_tcb **locked_tcb, 2421 uint8_t mflowtype, uint32_t mflowid, 2422 uint32_t vrf_id, uint16_t port) 2423 { 2424 struct sctp_state_cookie *cookie; 2425 struct sctp_tcb *l_stcb = *stcb; 2426 struct sctp_inpcb *l_inp; 2427 struct sockaddr *to; 2428 struct sctp_pcb *ep; 2429 struct mbuf *m_sig; 2430 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2431 uint8_t *sig; 2432 uint8_t cookie_ok = 0; 2433 unsigned int sig_offset, cookie_offset; 2434 unsigned int cookie_len; 2435 struct timeval now; 2436 struct timeval time_expires; 2437 int notification = 0; 2438 struct sctp_nets *netl; 2439 int had_a_existing_tcb = 0; 2440 int send_int_conf = 0; 2441 #ifdef INET 2442 struct sockaddr_in sin; 2443 #endif 2444 #ifdef INET6 2445 struct sockaddr_in6 sin6; 2446 #endif 2447 2448 SCTPDBG(SCTP_DEBUG_INPUT2, 2449 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2450 2451 if (inp_p == NULL) { 2452 return (NULL); 2453 } 2454 cookie = &cp->cookie; 2455 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2456 cookie_len = ntohs(cp->ch.chunk_length); 2457 2458 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2459 sizeof(struct sctp_init_chunk) + 2460 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2461 /* cookie too small */ 2462 return (NULL); 2463 } 2464 if ((cookie->peerport != sh->src_port) || 2465 (cookie->myport != sh->dest_port) || 2466 (cookie->my_vtag != sh->v_tag)) { 2467 /* 2468 * invalid ports or bad tag. Note that we always leave the 2469 * v_tag in the header in network order and when we stored 2470 * it in the my_vtag slot we also left it in network order. 2471 * This maintains the match even though it may be in the 2472 * opposite byte order of the machine :-> 2473 */ 2474 return (NULL); 2475 } 2476 /* 2477 * split off the signature into its own mbuf (since it should not be 2478 * calculated in the sctp_hmac_m() call). 2479 */ 2480 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2481 m_sig = m_split(m, sig_offset, M_NOWAIT); 2482 if (m_sig == NULL) { 2483 /* out of memory or ?? */ 2484 return (NULL); 2485 } 2486 #ifdef SCTP_MBUF_LOGGING 2487 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2488 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2489 } 2490 #endif 2491 2492 /* 2493 * compute the signature/digest for the cookie 2494 */ 2495 ep = &(*inp_p)->sctp_ep; 2496 l_inp = *inp_p; 2497 if (l_stcb) { 2498 SCTP_TCB_UNLOCK(l_stcb); 2499 } 2500 SCTP_INP_RLOCK(l_inp); 2501 if (l_stcb) { 2502 SCTP_TCB_LOCK(l_stcb); 2503 } 2504 /* which cookie is it? */ 2505 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2506 (ep->current_secret_number != ep->last_secret_number)) { 2507 /* it's the old cookie */ 2508 (void)sctp_hmac_m(SCTP_HMAC, 2509 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2510 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2511 } else { 2512 /* it's the current cookie */ 2513 (void)sctp_hmac_m(SCTP_HMAC, 2514 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2515 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2516 } 2517 /* get the signature */ 2518 SCTP_INP_RUNLOCK(l_inp); 2519 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2520 if (sig == NULL) { 2521 /* couldn't find signature */ 2522 sctp_m_freem(m_sig); 2523 return (NULL); 2524 } 2525 /* compare the received digest with the computed digest */ 2526 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2527 /* try the old cookie? */ 2528 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2529 (ep->current_secret_number != ep->last_secret_number)) { 2530 /* compute digest with old */ 2531 (void)sctp_hmac_m(SCTP_HMAC, 2532 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2533 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2534 /* compare */ 2535 if (memcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2536 cookie_ok = 1; 2537 } 2538 } else { 2539 cookie_ok = 1; 2540 } 2541 2542 /* 2543 * Now before we continue we must reconstruct our mbuf so that 2544 * normal processing of any other chunks will work. 2545 */ 2546 { 2547 struct mbuf *m_at; 2548 2549 m_at = m; 2550 while (SCTP_BUF_NEXT(m_at) != NULL) { 2551 m_at = SCTP_BUF_NEXT(m_at); 2552 } 2553 SCTP_BUF_NEXT(m_at) = m_sig; 2554 } 2555 2556 if (cookie_ok == 0) { 2557 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2558 SCTPDBG(SCTP_DEBUG_INPUT2, 2559 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2560 (uint32_t)offset, cookie_offset, sig_offset); 2561 return (NULL); 2562 } 2563 /* 2564 * check the cookie timestamps to be sure it's not stale 2565 */ 2566 (void)SCTP_GETTIME_TIMEVAL(&now); 2567 /* Expire time is in Ticks, so we convert to seconds */ 2568 time_expires.tv_sec = cookie->time_entered.tv_sec + TICKS_TO_SEC(cookie->cookie_life); 2569 time_expires.tv_usec = cookie->time_entered.tv_usec; 2570 if (timevalcmp(&now, &time_expires, >)) { 2571 /* cookie is stale! */ 2572 struct mbuf *op_err; 2573 struct sctp_error_stale_cookie *cause; 2574 struct timeval diff; 2575 uint32_t staleness; 2576 2577 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2578 0, M_NOWAIT, 1, MT_DATA); 2579 if (op_err == NULL) { 2580 /* FOOBAR */ 2581 return (NULL); 2582 } 2583 /* Set the len */ 2584 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2585 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2586 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2587 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2588 (sizeof(uint32_t)))); 2589 diff = now; 2590 timevalsub(&diff, &time_expires); 2591 if (diff.tv_sec > UINT32_MAX / 1000000) { 2592 staleness = UINT32_MAX; 2593 } else { 2594 staleness = diff.tv_sec * 1000000; 2595 } 2596 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2597 staleness += diff.tv_usec; 2598 } else { 2599 staleness = UINT32_MAX; 2600 } 2601 cause->stale_time = htonl(staleness); 2602 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2603 mflowtype, mflowid, l_inp->fibnum, 2604 vrf_id, port); 2605 return (NULL); 2606 } 2607 /* 2608 * Now we must see with the lookup address if we have an existing 2609 * asoc. This will only happen if we were in the COOKIE-WAIT state 2610 * and a INIT collided with us and somewhere the peer sent the 2611 * cookie on another address besides the single address our assoc 2612 * had for him. In this case we will have one of the tie-tags set at 2613 * least AND the address field in the cookie can be used to look it 2614 * up. 2615 */ 2616 to = NULL; 2617 switch (cookie->addr_type) { 2618 #ifdef INET6 2619 case SCTP_IPV6_ADDRESS: 2620 memset(&sin6, 0, sizeof(sin6)); 2621 sin6.sin6_family = AF_INET6; 2622 sin6.sin6_len = sizeof(sin6); 2623 sin6.sin6_port = sh->src_port; 2624 sin6.sin6_scope_id = cookie->scope_id; 2625 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2626 sizeof(sin6.sin6_addr.s6_addr)); 2627 to = (struct sockaddr *)&sin6; 2628 break; 2629 #endif 2630 #ifdef INET 2631 case SCTP_IPV4_ADDRESS: 2632 memset(&sin, 0, sizeof(sin)); 2633 sin.sin_family = AF_INET; 2634 sin.sin_len = sizeof(sin); 2635 sin.sin_port = sh->src_port; 2636 sin.sin_addr.s_addr = cookie->address[0]; 2637 to = (struct sockaddr *)&sin; 2638 break; 2639 #endif 2640 default: 2641 /* This should not happen */ 2642 return (NULL); 2643 } 2644 if (*stcb == NULL) { 2645 /* Yep, lets check */ 2646 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2647 if (*stcb == NULL) { 2648 /* 2649 * We should have only got back the same inp. If we 2650 * got back a different ep we have a problem. The 2651 * original findep got back l_inp and now 2652 */ 2653 if (l_inp != *inp_p) { 2654 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2655 } 2656 } else { 2657 if (*locked_tcb == NULL) { 2658 /* 2659 * In this case we found the assoc only 2660 * after we locked the create lock. This 2661 * means we are in a colliding case and we 2662 * must make sure that we unlock the tcb if 2663 * its one of the cases where we throw away 2664 * the incoming packets. 2665 */ 2666 *locked_tcb = *stcb; 2667 2668 /* 2669 * We must also increment the inp ref count 2670 * since the ref_count flags was set when we 2671 * did not find the TCB, now we found it 2672 * which reduces the refcount.. we must 2673 * raise it back out to balance it all :-) 2674 */ 2675 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2676 if ((*stcb)->sctp_ep != l_inp) { 2677 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2678 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2679 } 2680 } 2681 } 2682 } 2683 cookie_len -= SCTP_SIGNATURE_SIZE; 2684 if (*stcb == NULL) { 2685 /* this is the "normal" case... get a new TCB */ 2686 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2687 cookie, cookie_len, *inp_p, 2688 netp, to, ¬ification, 2689 auth_skipped, auth_offset, auth_len, 2690 mflowtype, mflowid, 2691 vrf_id, port); 2692 } else { 2693 /* this is abnormal... cookie-echo on existing TCB */ 2694 had_a_existing_tcb = 1; 2695 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2696 src, dst, sh, 2697 cookie, cookie_len, *inp_p, *stcb, netp, to, 2698 ¬ification, auth_skipped, auth_offset, auth_len, 2699 mflowtype, mflowid, 2700 vrf_id, port); 2701 } 2702 2703 if (*stcb == NULL) { 2704 /* still no TCB... must be bad cookie-echo */ 2705 return (NULL); 2706 } 2707 if (*netp != NULL) { 2708 (*netp)->flowtype = mflowtype; 2709 (*netp)->flowid = mflowid; 2710 } 2711 /* 2712 * Ok, we built an association so confirm the address we sent the 2713 * INIT-ACK to. 2714 */ 2715 netl = sctp_findnet(*stcb, to); 2716 /* 2717 * This code should in theory NOT run but 2718 */ 2719 if (netl == NULL) { 2720 /* TSNH! Huh, why do I need to add this address here? */ 2721 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2722 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2723 return (NULL); 2724 } 2725 netl = sctp_findnet(*stcb, to); 2726 } 2727 if (netl) { 2728 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2729 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2730 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2731 netl); 2732 send_int_conf = 1; 2733 } 2734 } 2735 sctp_start_net_timers(*stcb); 2736 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2737 if (!had_a_existing_tcb || 2738 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2739 /* 2740 * If we have a NEW cookie or the connect never 2741 * reached the connected state during collision we 2742 * must do the TCP accept thing. 2743 */ 2744 struct socket *so, *oso; 2745 struct sctp_inpcb *inp; 2746 2747 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2748 /* 2749 * For a restart we will keep the same 2750 * socket, no need to do anything. I THINK!! 2751 */ 2752 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2753 if (send_int_conf) { 2754 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2755 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2756 } 2757 return (m); 2758 } 2759 oso = (*inp_p)->sctp_socket; 2760 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2761 SCTP_TCB_UNLOCK((*stcb)); 2762 CURVNET_SET(oso->so_vnet); 2763 so = sonewconn(oso, 0 2764 ); 2765 CURVNET_RESTORE(); 2766 SCTP_TCB_LOCK((*stcb)); 2767 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2768 2769 if (so == NULL) { 2770 struct mbuf *op_err; 2771 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2772 struct socket *pcb_so; 2773 #endif 2774 /* Too many sockets */ 2775 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2776 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2777 sctp_abort_association(*inp_p, NULL, m, iphlen, 2778 src, dst, sh, op_err, 2779 mflowtype, mflowid, 2780 vrf_id, port); 2781 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2782 pcb_so = SCTP_INP_SO(*inp_p); 2783 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2784 SCTP_TCB_UNLOCK((*stcb)); 2785 SCTP_SOCKET_LOCK(pcb_so, 1); 2786 SCTP_TCB_LOCK((*stcb)); 2787 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2788 #endif 2789 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2790 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2792 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2793 #endif 2794 return (NULL); 2795 } 2796 inp = (struct sctp_inpcb *)so->so_pcb; 2797 SCTP_INP_INCR_REF(inp); 2798 /* 2799 * We add the unbound flag here so that if we get an 2800 * soabort() before we get the move_pcb done, we 2801 * will properly cleanup. 2802 */ 2803 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2804 SCTP_PCB_FLAGS_CONNECTED | 2805 SCTP_PCB_FLAGS_IN_TCPPOOL | 2806 SCTP_PCB_FLAGS_UNBOUND | 2807 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2808 SCTP_PCB_FLAGS_DONT_WAKE); 2809 inp->sctp_features = (*inp_p)->sctp_features; 2810 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2811 inp->sctp_socket = so; 2812 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2813 inp->max_cwnd = (*inp_p)->max_cwnd; 2814 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2815 inp->ecn_supported = (*inp_p)->ecn_supported; 2816 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2817 inp->auth_supported = (*inp_p)->auth_supported; 2818 inp->asconf_supported = (*inp_p)->asconf_supported; 2819 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2820 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2821 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2822 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2823 inp->sctp_context = (*inp_p)->sctp_context; 2824 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2825 inp->fibnum = (*inp_p)->fibnum; 2826 inp->inp_starting_point_for_iterator = NULL; 2827 /* 2828 * copy in the authentication parameters from the 2829 * original endpoint 2830 */ 2831 if (inp->sctp_ep.local_hmacs) 2832 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2833 inp->sctp_ep.local_hmacs = 2834 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2835 if (inp->sctp_ep.local_auth_chunks) 2836 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2837 inp->sctp_ep.local_auth_chunks = 2838 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2839 2840 /* 2841 * Now we must move it from one hash table to 2842 * another and get the tcb in the right place. 2843 */ 2844 2845 /* 2846 * This is where the one-2-one socket is put into 2847 * the accept state waiting for the accept! 2848 */ 2849 if (*stcb) { 2850 (*stcb)->asoc.state |= SCTP_STATE_IN_ACCEPT_QUEUE; 2851 } 2852 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2853 2854 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2855 SCTP_TCB_UNLOCK((*stcb)); 2856 2857 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2858 0); 2859 SCTP_TCB_LOCK((*stcb)); 2860 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2861 2862 2863 /* 2864 * now we must check to see if we were aborted while 2865 * the move was going on and the lock/unlock 2866 * happened. 2867 */ 2868 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2869 /* 2870 * yep it was, we leave the assoc attached 2871 * to the socket since the sctp_inpcb_free() 2872 * call will send an abort for us. 2873 */ 2874 SCTP_INP_DECR_REF(inp); 2875 return (NULL); 2876 } 2877 SCTP_INP_DECR_REF(inp); 2878 /* Switch over to the new guy */ 2879 *inp_p = inp; 2880 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2881 if (send_int_conf) { 2882 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2883 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2884 } 2885 /* 2886 * Pull it from the incomplete queue and wake the 2887 * guy 2888 */ 2889 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2890 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2891 SCTP_TCB_UNLOCK((*stcb)); 2892 SCTP_SOCKET_LOCK(so, 1); 2893 #endif 2894 soisconnected(so); 2895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2896 SCTP_TCB_LOCK((*stcb)); 2897 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2898 SCTP_SOCKET_UNLOCK(so, 1); 2899 #endif 2900 return (m); 2901 } 2902 } 2903 if (notification) { 2904 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2905 } 2906 if (send_int_conf) { 2907 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2908 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2909 } 2910 return (m); 2911 } 2912 2913 static void 2914 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2915 struct sctp_tcb *stcb, struct sctp_nets *net) 2916 { 2917 /* cp must not be used, others call this without a c-ack :-) */ 2918 struct sctp_association *asoc; 2919 2920 SCTPDBG(SCTP_DEBUG_INPUT2, 2921 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2922 if ((stcb == NULL) || (net == NULL)) { 2923 return; 2924 } 2925 asoc = &stcb->asoc; 2926 2927 sctp_stop_all_cookie_timers(stcb); 2928 /* process according to association state */ 2929 if (SCTP_GET_STATE(asoc) == SCTP_STATE_COOKIE_ECHOED) { 2930 /* state change only needed when I am in right state */ 2931 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2932 SCTP_SET_STATE(asoc, SCTP_STATE_OPEN); 2933 sctp_start_net_timers(stcb); 2934 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2935 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2936 stcb->sctp_ep, stcb, asoc->primary_destination); 2937 2938 } 2939 /* update RTO */ 2940 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2941 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2942 if (asoc->overall_error_count == 0) { 2943 net->RTO = sctp_calculate_rto(stcb, asoc, net, 2944 &asoc->time_entered, 2945 SCTP_RTT_FROM_NON_DATA); 2946 } 2947 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2948 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2949 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2950 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2951 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2952 struct socket *so; 2953 2954 #endif 2955 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2956 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2957 so = SCTP_INP_SO(stcb->sctp_ep); 2958 atomic_add_int(&stcb->asoc.refcnt, 1); 2959 SCTP_TCB_UNLOCK(stcb); 2960 SCTP_SOCKET_LOCK(so, 1); 2961 SCTP_TCB_LOCK(stcb); 2962 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2963 #endif 2964 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2965 soisconnected(stcb->sctp_socket); 2966 } 2967 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2968 SCTP_SOCKET_UNLOCK(so, 1); 2969 #endif 2970 } 2971 /* 2972 * since we did not send a HB make sure we don't double 2973 * things 2974 */ 2975 net->hb_responded = 1; 2976 2977 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2978 /* 2979 * We don't need to do the asconf thing, nor hb or 2980 * autoclose if the socket is closed. 2981 */ 2982 goto closed_socket; 2983 } 2984 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2985 stcb, net); 2986 2987 2988 if (stcb->asoc.sctp_autoclose_ticks && 2989 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2990 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2991 stcb->sctp_ep, stcb, NULL); 2992 } 2993 /* 2994 * send ASCONF if parameters are pending and ASCONFs are 2995 * allowed (eg. addresses changed when init/cookie echo were 2996 * in flight) 2997 */ 2998 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2999 (stcb->asoc.asconf_supported == 1) && 3000 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3001 #ifdef SCTP_TIMER_BASED_ASCONF 3002 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3003 stcb->sctp_ep, stcb, 3004 stcb->asoc.primary_destination); 3005 #else 3006 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3007 SCTP_ADDR_NOT_LOCKED); 3008 #endif 3009 } 3010 } 3011 closed_socket: 3012 /* Toss the cookie if I can */ 3013 sctp_toss_old_cookies(stcb, asoc); 3014 if (!TAILQ_EMPTY(&asoc->sent_queue)) { 3015 /* Restart the timer if we have pending data */ 3016 struct sctp_tmit_chunk *chk; 3017 3018 chk = TAILQ_FIRST(&asoc->sent_queue); 3019 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3020 } 3021 } 3022 3023 static void 3024 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3025 struct sctp_tcb *stcb) 3026 { 3027 struct sctp_nets *net; 3028 struct sctp_tmit_chunk *lchk; 3029 struct sctp_ecne_chunk bkup; 3030 uint8_t override_bit; 3031 uint32_t tsn, window_data_tsn; 3032 int len; 3033 unsigned int pkt_cnt; 3034 3035 len = ntohs(cp->ch.chunk_length); 3036 if ((len != sizeof(struct sctp_ecne_chunk)) && 3037 (len != sizeof(struct old_sctp_ecne_chunk))) { 3038 return; 3039 } 3040 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3041 /* Its the old format */ 3042 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3043 bkup.num_pkts_since_cwr = htonl(1); 3044 cp = &bkup; 3045 } 3046 SCTP_STAT_INCR(sctps_recvecne); 3047 tsn = ntohl(cp->tsn); 3048 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3049 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3050 if (lchk == NULL) { 3051 window_data_tsn = stcb->asoc.sending_seq - 1; 3052 } else { 3053 window_data_tsn = lchk->rec.data.tsn; 3054 } 3055 3056 /* Find where it was sent to if possible. */ 3057 net = NULL; 3058 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3059 if (lchk->rec.data.tsn == tsn) { 3060 net = lchk->whoTo; 3061 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3062 break; 3063 } 3064 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3065 break; 3066 } 3067 } 3068 if (net == NULL) { 3069 /* 3070 * What to do. A previous send of a CWR was possibly lost. 3071 * See how old it is, we may have it marked on the actual 3072 * net. 3073 */ 3074 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3075 if (tsn == net->last_cwr_tsn) { 3076 /* Found him, send it off */ 3077 break; 3078 } 3079 } 3080 if (net == NULL) { 3081 /* 3082 * If we reach here, we need to send a special CWR 3083 * that says hey, we did this a long time ago and 3084 * you lost the response. 3085 */ 3086 net = TAILQ_FIRST(&stcb->asoc.nets); 3087 if (net == NULL) { 3088 /* TSNH */ 3089 return; 3090 } 3091 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3092 } else { 3093 override_bit = 0; 3094 } 3095 } else { 3096 override_bit = 0; 3097 } 3098 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3099 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3100 /* 3101 * JRS - Use the congestion control given in the pluggable 3102 * CC module 3103 */ 3104 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3105 /* 3106 * We reduce once every RTT. So we will only lower cwnd at 3107 * the next sending seq i.e. the window_data_tsn 3108 */ 3109 net->cwr_window_tsn = window_data_tsn; 3110 net->ecn_ce_pkt_cnt += pkt_cnt; 3111 net->lost_cnt = pkt_cnt; 3112 net->last_cwr_tsn = tsn; 3113 } else { 3114 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3115 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3116 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3117 /* 3118 * Another loss in the same window update how many 3119 * marks/packets lost we have had. 3120 */ 3121 int cnt = 1; 3122 3123 if (pkt_cnt > net->lost_cnt) { 3124 /* Should be the case */ 3125 cnt = (pkt_cnt - net->lost_cnt); 3126 net->ecn_ce_pkt_cnt += cnt; 3127 } 3128 net->lost_cnt = pkt_cnt; 3129 net->last_cwr_tsn = tsn; 3130 /* 3131 * Most CC functions will ignore this call, since we 3132 * are in-window yet of the initial CE the peer saw. 3133 */ 3134 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3135 } 3136 } 3137 /* 3138 * We always send a CWR this way if our previous one was lost our 3139 * peer will get an update, or if it is not time again to reduce we 3140 * still get the cwr to the peer. Note we set the override when we 3141 * could not find the TSN on the chunk or the destination network. 3142 */ 3143 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3144 } 3145 3146 static void 3147 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3148 { 3149 /* 3150 * Here we get a CWR from the peer. We must look in the outqueue and 3151 * make sure that we have a covered ECNE in the control chunk part. 3152 * If so remove it. 3153 */ 3154 struct sctp_tmit_chunk *chk, *nchk; 3155 struct sctp_ecne_chunk *ecne; 3156 int override; 3157 uint32_t cwr_tsn; 3158 3159 cwr_tsn = ntohl(cp->tsn); 3160 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3161 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3162 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3163 continue; 3164 } 3165 if ((override == 0) && (chk->whoTo != net)) { 3166 /* Must be from the right src unless override is set */ 3167 continue; 3168 } 3169 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3170 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3171 /* this covers this ECNE, we can remove it */ 3172 stcb->asoc.ecn_echo_cnt_onq--; 3173 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3174 sctp_next); 3175 sctp_m_freem(chk->data); 3176 chk->data = NULL; 3177 stcb->asoc.ctrl_queue_cnt--; 3178 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3179 if (override == 0) { 3180 break; 3181 } 3182 } 3183 } 3184 } 3185 3186 static void 3187 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3188 struct sctp_tcb *stcb, struct sctp_nets *net) 3189 { 3190 struct sctp_association *asoc; 3191 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3192 struct socket *so; 3193 #endif 3194 3195 SCTPDBG(SCTP_DEBUG_INPUT2, 3196 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3197 if (stcb == NULL) 3198 return; 3199 3200 asoc = &stcb->asoc; 3201 /* process according to association state */ 3202 if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3203 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3204 SCTPDBG(SCTP_DEBUG_INPUT2, 3205 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3206 SCTP_TCB_UNLOCK(stcb); 3207 return; 3208 } 3209 /* notify upper layer protocol */ 3210 if (stcb->sctp_socket) { 3211 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3212 } 3213 #ifdef INVARIANTS 3214 if (!TAILQ_EMPTY(&asoc->send_queue) || 3215 !TAILQ_EMPTY(&asoc->sent_queue) || 3216 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3217 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3218 } 3219 #endif 3220 /* stop the timer */ 3221 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3222 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3223 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3224 /* free the TCB */ 3225 SCTPDBG(SCTP_DEBUG_INPUT2, 3226 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3227 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3228 so = SCTP_INP_SO(stcb->sctp_ep); 3229 atomic_add_int(&stcb->asoc.refcnt, 1); 3230 SCTP_TCB_UNLOCK(stcb); 3231 SCTP_SOCKET_LOCK(so, 1); 3232 SCTP_TCB_LOCK(stcb); 3233 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3234 #endif 3235 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3236 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3237 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3238 SCTP_SOCKET_UNLOCK(so, 1); 3239 #endif 3240 return; 3241 } 3242 3243 static int 3244 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3245 struct sctp_nets *net, uint8_t flg) 3246 { 3247 switch (desc->chunk_type) { 3248 case SCTP_DATA: 3249 /* find the tsn to resend (possibly */ 3250 { 3251 uint32_t tsn; 3252 struct sctp_tmit_chunk *tp1; 3253 3254 tsn = ntohl(desc->tsn_ifany); 3255 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3256 if (tp1->rec.data.tsn == tsn) { 3257 /* found it */ 3258 break; 3259 } 3260 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3261 /* not found */ 3262 tp1 = NULL; 3263 break; 3264 } 3265 } 3266 if (tp1 == NULL) { 3267 /* 3268 * Do it the other way , aka without paying 3269 * attention to queue seq order. 3270 */ 3271 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3272 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3273 if (tp1->rec.data.tsn == tsn) { 3274 /* found it */ 3275 break; 3276 } 3277 } 3278 } 3279 if (tp1 == NULL) { 3280 SCTP_STAT_INCR(sctps_pdrptsnnf); 3281 } 3282 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3283 uint8_t *ddp; 3284 3285 if (((flg & SCTP_BADCRC) == 0) && 3286 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3287 return (0); 3288 } 3289 if ((stcb->asoc.peers_rwnd == 0) && 3290 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3291 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3292 return (0); 3293 } 3294 if (stcb->asoc.peers_rwnd == 0 && 3295 (flg & SCTP_FROM_MIDDLE_BOX)) { 3296 SCTP_STAT_INCR(sctps_pdrpdizrw); 3297 return (0); 3298 } 3299 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3300 sizeof(struct sctp_data_chunk)); 3301 { 3302 unsigned int iii; 3303 3304 for (iii = 0; iii < sizeof(desc->data_bytes); 3305 iii++) { 3306 if (ddp[iii] != desc->data_bytes[iii]) { 3307 SCTP_STAT_INCR(sctps_pdrpbadd); 3308 return (-1); 3309 } 3310 } 3311 } 3312 3313 if (tp1->do_rtt) { 3314 /* 3315 * this guy had a RTO calculation 3316 * pending on it, cancel it 3317 */ 3318 if (tp1->whoTo->rto_needed == 0) { 3319 tp1->whoTo->rto_needed = 1; 3320 } 3321 tp1->do_rtt = 0; 3322 } 3323 SCTP_STAT_INCR(sctps_pdrpmark); 3324 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3325 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3326 /* 3327 * mark it as if we were doing a FR, since 3328 * we will be getting gap ack reports behind 3329 * the info from the router. 3330 */ 3331 tp1->rec.data.doing_fast_retransmit = 1; 3332 /* 3333 * mark the tsn with what sequences can 3334 * cause a new FR. 3335 */ 3336 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3337 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3338 } else { 3339 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3340 } 3341 3342 /* restart the timer */ 3343 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3344 stcb, tp1->whoTo, 3345 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3346 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3347 stcb, tp1->whoTo); 3348 3349 /* fix counts and things */ 3350 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3351 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3352 tp1->whoTo->flight_size, 3353 tp1->book_size, 3354 (uint32_t)(uintptr_t)stcb, 3355 tp1->rec.data.tsn); 3356 } 3357 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3358 sctp_flight_size_decrease(tp1); 3359 sctp_total_flight_decrease(stcb, tp1); 3360 } 3361 tp1->sent = SCTP_DATAGRAM_RESEND; 3362 } { 3363 /* audit code */ 3364 unsigned int audit; 3365 3366 audit = 0; 3367 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3368 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3369 audit++; 3370 } 3371 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3372 sctp_next) { 3373 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3374 audit++; 3375 } 3376 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3377 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3378 audit, stcb->asoc.sent_queue_retran_cnt); 3379 #ifndef SCTP_AUDITING_ENABLED 3380 stcb->asoc.sent_queue_retran_cnt = audit; 3381 #endif 3382 } 3383 } 3384 } 3385 break; 3386 case SCTP_ASCONF: 3387 { 3388 struct sctp_tmit_chunk *asconf; 3389 3390 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3391 sctp_next) { 3392 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3393 break; 3394 } 3395 } 3396 if (asconf) { 3397 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3398 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3399 asconf->sent = SCTP_DATAGRAM_RESEND; 3400 asconf->snd_count--; 3401 } 3402 } 3403 break; 3404 case SCTP_INITIATION: 3405 /* resend the INIT */ 3406 stcb->asoc.dropped_special_cnt++; 3407 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3408 /* 3409 * If we can get it in, in a few attempts we do 3410 * this, otherwise we let the timer fire. 3411 */ 3412 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3413 stcb, net, 3414 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3415 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3416 } 3417 break; 3418 case SCTP_SELECTIVE_ACK: 3419 case SCTP_NR_SELECTIVE_ACK: 3420 /* resend the sack */ 3421 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3422 break; 3423 case SCTP_HEARTBEAT_REQUEST: 3424 /* resend a demand HB */ 3425 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3426 /* 3427 * Only retransmit if we KNOW we wont destroy the 3428 * tcb 3429 */ 3430 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3431 } 3432 break; 3433 case SCTP_SHUTDOWN: 3434 sctp_send_shutdown(stcb, net); 3435 break; 3436 case SCTP_SHUTDOWN_ACK: 3437 sctp_send_shutdown_ack(stcb, net); 3438 break; 3439 case SCTP_COOKIE_ECHO: 3440 { 3441 struct sctp_tmit_chunk *cookie; 3442 3443 cookie = NULL; 3444 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3445 sctp_next) { 3446 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3447 break; 3448 } 3449 } 3450 if (cookie) { 3451 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3452 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3453 cookie->sent = SCTP_DATAGRAM_RESEND; 3454 sctp_stop_all_cookie_timers(stcb); 3455 } 3456 } 3457 break; 3458 case SCTP_COOKIE_ACK: 3459 sctp_send_cookie_ack(stcb); 3460 break; 3461 case SCTP_ASCONF_ACK: 3462 /* resend last asconf ack */ 3463 sctp_send_asconf_ack(stcb); 3464 break; 3465 case SCTP_IFORWARD_CUM_TSN: 3466 case SCTP_FORWARD_CUM_TSN: 3467 send_forward_tsn(stcb, &stcb->asoc); 3468 break; 3469 /* can't do anything with these */ 3470 case SCTP_PACKET_DROPPED: 3471 case SCTP_INITIATION_ACK: /* this should not happen */ 3472 case SCTP_HEARTBEAT_ACK: 3473 case SCTP_ABORT_ASSOCIATION: 3474 case SCTP_OPERATION_ERROR: 3475 case SCTP_SHUTDOWN_COMPLETE: 3476 case SCTP_ECN_ECHO: 3477 case SCTP_ECN_CWR: 3478 default: 3479 break; 3480 } 3481 return (0); 3482 } 3483 3484 void 3485 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3486 { 3487 uint32_t i; 3488 uint16_t temp; 3489 3490 /* 3491 * We set things to 0xffffffff since this is the last delivered 3492 * sequence and we will be sending in 0 after the reset. 3493 */ 3494 3495 if (number_entries) { 3496 for (i = 0; i < number_entries; i++) { 3497 temp = ntohs(list[i]); 3498 if (temp >= stcb->asoc.streamincnt) { 3499 continue; 3500 } 3501 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3502 } 3503 } else { 3504 list = NULL; 3505 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3506 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3507 } 3508 } 3509 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3510 } 3511 3512 static void 3513 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3514 { 3515 uint32_t i; 3516 uint16_t temp; 3517 3518 if (number_entries > 0) { 3519 for (i = 0; i < number_entries; i++) { 3520 temp = ntohs(list[i]); 3521 if (temp >= stcb->asoc.streamoutcnt) { 3522 /* no such stream */ 3523 continue; 3524 } 3525 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3526 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3527 } 3528 } else { 3529 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3530 stcb->asoc.strmout[i].next_mid_ordered = 0; 3531 stcb->asoc.strmout[i].next_mid_unordered = 0; 3532 } 3533 } 3534 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3535 } 3536 3537 static void 3538 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3539 { 3540 uint32_t i; 3541 uint16_t temp; 3542 3543 if (number_entries > 0) { 3544 for (i = 0; i < number_entries; i++) { 3545 temp = ntohs(list[i]); 3546 if (temp >= stcb->asoc.streamoutcnt) { 3547 /* no such stream */ 3548 continue; 3549 } 3550 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3551 } 3552 } else { 3553 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3554 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3555 } 3556 } 3557 } 3558 3559 3560 struct sctp_stream_reset_request * 3561 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3562 { 3563 struct sctp_association *asoc; 3564 struct sctp_chunkhdr *ch; 3565 struct sctp_stream_reset_request *r; 3566 struct sctp_tmit_chunk *chk; 3567 int len, clen; 3568 3569 asoc = &stcb->asoc; 3570 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3571 asoc->stream_reset_outstanding = 0; 3572 return (NULL); 3573 } 3574 if (stcb->asoc.str_reset == NULL) { 3575 asoc->stream_reset_outstanding = 0; 3576 return (NULL); 3577 } 3578 chk = stcb->asoc.str_reset; 3579 if (chk->data == NULL) { 3580 return (NULL); 3581 } 3582 if (bchk) { 3583 /* he wants a copy of the chk pointer */ 3584 *bchk = chk; 3585 } 3586 clen = chk->send_size; 3587 ch = mtod(chk->data, struct sctp_chunkhdr *); 3588 r = (struct sctp_stream_reset_request *)(ch + 1); 3589 if (ntohl(r->request_seq) == seq) { 3590 /* found it */ 3591 return (r); 3592 } 3593 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3594 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3595 /* move to the next one, there can only be a max of two */ 3596 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3597 if (ntohl(r->request_seq) == seq) { 3598 return (r); 3599 } 3600 } 3601 /* that seq is not here */ 3602 return (NULL); 3603 } 3604 3605 static void 3606 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3607 { 3608 struct sctp_association *asoc; 3609 struct sctp_tmit_chunk *chk = stcb->asoc.str_reset; 3610 3611 if (stcb->asoc.str_reset == NULL) { 3612 return; 3613 } 3614 asoc = &stcb->asoc; 3615 3616 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3617 chk->whoTo, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3618 TAILQ_REMOVE(&asoc->control_send_queue, 3619 chk, 3620 sctp_next); 3621 if (chk->data) { 3622 sctp_m_freem(chk->data); 3623 chk->data = NULL; 3624 } 3625 asoc->ctrl_queue_cnt--; 3626 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3627 /* sa_ignore NO_NULL_CHK */ 3628 stcb->asoc.str_reset = NULL; 3629 } 3630 3631 3632 static int 3633 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3634 uint32_t seq, uint32_t action, 3635 struct sctp_stream_reset_response *respin) 3636 { 3637 uint16_t type; 3638 int lparam_len; 3639 struct sctp_association *asoc = &stcb->asoc; 3640 struct sctp_tmit_chunk *chk; 3641 struct sctp_stream_reset_request *req_param; 3642 struct sctp_stream_reset_out_request *req_out_param; 3643 struct sctp_stream_reset_in_request *req_in_param; 3644 uint32_t number_entries; 3645 3646 if (asoc->stream_reset_outstanding == 0) { 3647 /* duplicate */ 3648 return (0); 3649 } 3650 if (seq == stcb->asoc.str_reset_seq_out) { 3651 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3652 if (req_param != NULL) { 3653 stcb->asoc.str_reset_seq_out++; 3654 type = ntohs(req_param->ph.param_type); 3655 lparam_len = ntohs(req_param->ph.param_length); 3656 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3657 int no_clear = 0; 3658 3659 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3660 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3661 asoc->stream_reset_out_is_outstanding = 0; 3662 if (asoc->stream_reset_outstanding) 3663 asoc->stream_reset_outstanding--; 3664 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3665 /* do it */ 3666 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3667 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3668 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3669 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3670 /* 3671 * Set it up so we don't stop 3672 * retransmitting 3673 */ 3674 asoc->stream_reset_outstanding++; 3675 stcb->asoc.str_reset_seq_out--; 3676 asoc->stream_reset_out_is_outstanding = 1; 3677 no_clear = 1; 3678 } else { 3679 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3680 } 3681 if (no_clear == 0) { 3682 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3683 } 3684 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3685 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3686 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3687 if (asoc->stream_reset_outstanding) 3688 asoc->stream_reset_outstanding--; 3689 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3690 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3691 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3692 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3693 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3694 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3695 } 3696 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3697 /* Ok we now may have more streams */ 3698 int num_stream; 3699 3700 num_stream = stcb->asoc.strm_pending_add_size; 3701 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3702 /* TSNH */ 3703 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3704 } 3705 stcb->asoc.strm_pending_add_size = 0; 3706 if (asoc->stream_reset_outstanding) 3707 asoc->stream_reset_outstanding--; 3708 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3709 /* Put the new streams into effect */ 3710 int i; 3711 3712 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3713 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3714 } 3715 asoc->streamoutcnt += num_stream; 3716 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3717 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3718 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3719 SCTP_STREAM_CHANGE_DENIED); 3720 } else { 3721 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3722 SCTP_STREAM_CHANGE_FAILED); 3723 } 3724 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3725 if (asoc->stream_reset_outstanding) 3726 asoc->stream_reset_outstanding--; 3727 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3728 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3729 SCTP_STREAM_CHANGE_DENIED); 3730 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3731 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3732 SCTP_STREAM_CHANGE_FAILED); 3733 } 3734 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3735 /** 3736 * a) Adopt the new in tsn. 3737 * b) reset the map 3738 * c) Adopt the new out-tsn 3739 */ 3740 struct sctp_stream_reset_response_tsn *resp; 3741 struct sctp_forward_tsn_chunk fwdtsn; 3742 int abort_flag = 0; 3743 3744 if (respin == NULL) { 3745 /* huh ? */ 3746 return (0); 3747 } 3748 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3749 return (0); 3750 } 3751 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3752 resp = (struct sctp_stream_reset_response_tsn *)respin; 3753 asoc->stream_reset_outstanding--; 3754 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3755 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3756 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3757 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3758 if (abort_flag) { 3759 return (1); 3760 } 3761 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3762 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3763 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3764 } 3765 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3766 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3767 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3768 3769 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3770 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3771 3772 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3773 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3774 3775 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3776 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3777 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3778 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3779 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3780 SCTP_ASSOC_RESET_DENIED); 3781 } else { 3782 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3783 SCTP_ASSOC_RESET_FAILED); 3784 } 3785 } 3786 /* get rid of the request and get the request flags */ 3787 if (asoc->stream_reset_outstanding == 0) { 3788 sctp_clean_up_stream_reset(stcb); 3789 } 3790 } 3791 } 3792 if (asoc->stream_reset_outstanding == 0) { 3793 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3794 } 3795 return (0); 3796 } 3797 3798 static void 3799 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3800 struct sctp_tmit_chunk *chk, 3801 struct sctp_stream_reset_in_request *req, int trunc) 3802 { 3803 uint32_t seq; 3804 int len, i; 3805 int number_entries; 3806 uint16_t temp; 3807 3808 /* 3809 * peer wants me to send a str-reset to him for my outgoing seq's if 3810 * seq_in is right. 3811 */ 3812 struct sctp_association *asoc = &stcb->asoc; 3813 3814 seq = ntohl(req->request_seq); 3815 if (asoc->str_reset_seq_in == seq) { 3816 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3817 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3818 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3819 } else if (trunc) { 3820 /* Can't do it, since they exceeded our buffer size */ 3821 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3822 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3823 len = ntohs(req->ph.param_length); 3824 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3825 if (number_entries) { 3826 for (i = 0; i < number_entries; i++) { 3827 temp = ntohs(req->list_of_streams[i]); 3828 if (temp >= stcb->asoc.streamoutcnt) { 3829 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3830 goto bad_boy; 3831 } 3832 req->list_of_streams[i] = temp; 3833 } 3834 for (i = 0; i < number_entries; i++) { 3835 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3836 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3837 } 3838 } 3839 } else { 3840 /* Its all */ 3841 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3842 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3843 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3844 } 3845 } 3846 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3847 } else { 3848 /* Can't do it, since we have sent one out */ 3849 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3850 } 3851 bad_boy: 3852 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3853 asoc->str_reset_seq_in++; 3854 } else if (asoc->str_reset_seq_in - 1 == seq) { 3855 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3856 } else if (asoc->str_reset_seq_in - 2 == seq) { 3857 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3858 } else { 3859 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3860 } 3861 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3862 } 3863 3864 static int 3865 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3866 struct sctp_tmit_chunk *chk, 3867 struct sctp_stream_reset_tsn_request *req) 3868 { 3869 /* reset all in and out and update the tsn */ 3870 /* 3871 * A) reset my str-seq's on in and out. B) Select a receive next, 3872 * and set cum-ack to it. Also process this selected number as a 3873 * fwd-tsn as well. C) set in the response my next sending seq. 3874 */ 3875 struct sctp_forward_tsn_chunk fwdtsn; 3876 struct sctp_association *asoc = &stcb->asoc; 3877 int abort_flag = 0; 3878 uint32_t seq; 3879 3880 seq = ntohl(req->request_seq); 3881 if (asoc->str_reset_seq_in == seq) { 3882 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3883 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3884 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3885 } else { 3886 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3887 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3888 fwdtsn.ch.chunk_flags = 0; 3889 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3890 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3891 if (abort_flag) { 3892 return (1); 3893 } 3894 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3895 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3896 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3897 } 3898 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3899 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3900 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3901 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3902 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3903 atomic_add_int(&asoc->sending_seq, 1); 3904 /* save off historical data for retrans */ 3905 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3906 asoc->last_sending_seq[0] = asoc->sending_seq; 3907 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3908 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3909 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3910 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3911 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3912 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3913 } 3914 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3915 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3916 asoc->str_reset_seq_in++; 3917 } else if (asoc->str_reset_seq_in - 1 == seq) { 3918 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3919 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3920 } else if (asoc->str_reset_seq_in - 2 == seq) { 3921 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3922 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3923 } else { 3924 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3925 } 3926 return (0); 3927 } 3928 3929 static void 3930 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3931 struct sctp_tmit_chunk *chk, 3932 struct sctp_stream_reset_out_request *req, int trunc) 3933 { 3934 uint32_t seq, tsn; 3935 int number_entries, len; 3936 struct sctp_association *asoc = &stcb->asoc; 3937 3938 seq = ntohl(req->request_seq); 3939 3940 /* now if its not a duplicate we process it */ 3941 if (asoc->str_reset_seq_in == seq) { 3942 len = ntohs(req->ph.param_length); 3943 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3944 /* 3945 * the sender is resetting, handle the list issue.. we must 3946 * a) verify if we can do the reset, if so no problem b) If 3947 * we can't do the reset we must copy the request. c) queue 3948 * it, and setup the data in processor to trigger it off 3949 * when needed and dequeue all the queued data. 3950 */ 3951 tsn = ntohl(req->send_reset_at_tsn); 3952 3953 /* move the reset action back one */ 3954 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3955 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3956 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3957 } else if (trunc) { 3958 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3959 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3960 /* we can do it now */ 3961 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3962 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3963 } else { 3964 /* 3965 * we must queue it up and thus wait for the TSN's 3966 * to arrive that are at or before tsn 3967 */ 3968 struct sctp_stream_reset_list *liste; 3969 int siz; 3970 3971 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3972 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3973 siz, SCTP_M_STRESET); 3974 if (liste == NULL) { 3975 /* gak out of memory */ 3976 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3977 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3978 return; 3979 } 3980 liste->seq = seq; 3981 liste->tsn = tsn; 3982 liste->number_entries = number_entries; 3983 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3984 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3985 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3986 } 3987 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3988 asoc->str_reset_seq_in++; 3989 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3990 /* 3991 * one seq back, just echo back last action since my 3992 * response was lost. 3993 */ 3994 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3995 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3996 /* 3997 * two seq back, just echo back last action since my 3998 * response was lost. 3999 */ 4000 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4001 } else { 4002 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4003 } 4004 } 4005 4006 static void 4007 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4008 struct sctp_stream_reset_add_strm *str_add) 4009 { 4010 /* 4011 * Peer is requesting to add more streams. If its within our 4012 * max-streams we will allow it. 4013 */ 4014 uint32_t num_stream, i; 4015 uint32_t seq; 4016 struct sctp_association *asoc = &stcb->asoc; 4017 struct sctp_queued_to_read *ctl, *nctl; 4018 4019 /* Get the number. */ 4020 seq = ntohl(str_add->request_seq); 4021 num_stream = ntohs(str_add->number_of_streams); 4022 /* Now what would be the new total? */ 4023 if (asoc->str_reset_seq_in == seq) { 4024 num_stream += stcb->asoc.streamincnt; 4025 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4026 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4027 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4028 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4029 (num_stream > 0xffff)) { 4030 /* We must reject it they ask for to many */ 4031 denied: 4032 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4033 } else { 4034 /* Ok, we can do that :-) */ 4035 struct sctp_stream_in *oldstrm; 4036 4037 /* save off the old */ 4038 oldstrm = stcb->asoc.strmin; 4039 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4040 (num_stream * sizeof(struct sctp_stream_in)), 4041 SCTP_M_STRMI); 4042 if (stcb->asoc.strmin == NULL) { 4043 stcb->asoc.strmin = oldstrm; 4044 goto denied; 4045 } 4046 /* copy off the old data */ 4047 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4048 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4049 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4050 stcb->asoc.strmin[i].sid = i; 4051 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4052 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4053 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4054 /* now anything on those queues? */ 4055 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4056 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4057 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4058 } 4059 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4060 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4061 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4062 } 4063 } 4064 /* Init the new streams */ 4065 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4066 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4067 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4068 stcb->asoc.strmin[i].sid = i; 4069 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4070 stcb->asoc.strmin[i].pd_api_started = 0; 4071 stcb->asoc.strmin[i].delivery_started = 0; 4072 } 4073 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4074 /* update the size */ 4075 stcb->asoc.streamincnt = num_stream; 4076 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4077 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4078 } 4079 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4080 asoc->str_reset_seq_in++; 4081 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4082 /* 4083 * one seq back, just echo back last action since my 4084 * response was lost. 4085 */ 4086 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4087 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4088 /* 4089 * two seq back, just echo back last action since my 4090 * response was lost. 4091 */ 4092 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4093 } else { 4094 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4095 4096 } 4097 } 4098 4099 static void 4100 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4101 struct sctp_stream_reset_add_strm *str_add) 4102 { 4103 /* 4104 * Peer is requesting to add more streams. If its within our 4105 * max-streams we will allow it. 4106 */ 4107 uint16_t num_stream; 4108 uint32_t seq; 4109 struct sctp_association *asoc = &stcb->asoc; 4110 4111 /* Get the number. */ 4112 seq = ntohl(str_add->request_seq); 4113 num_stream = ntohs(str_add->number_of_streams); 4114 /* Now what would be the new total? */ 4115 if (asoc->str_reset_seq_in == seq) { 4116 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4117 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4118 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4119 } else if (stcb->asoc.stream_reset_outstanding) { 4120 /* We must reject it we have something pending */ 4121 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4122 } else { 4123 /* Ok, we can do that :-) */ 4124 int mychk; 4125 4126 mychk = stcb->asoc.streamoutcnt; 4127 mychk += num_stream; 4128 if (mychk < 0x10000) { 4129 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4130 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4131 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4132 } 4133 } else { 4134 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4135 } 4136 } 4137 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4138 asoc->str_reset_seq_in++; 4139 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4140 /* 4141 * one seq back, just echo back last action since my 4142 * response was lost. 4143 */ 4144 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4145 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4146 /* 4147 * two seq back, just echo back last action since my 4148 * response was lost. 4149 */ 4150 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4151 } else { 4152 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4153 } 4154 } 4155 4156 #ifdef __GNUC__ 4157 __attribute__((noinline)) 4158 #endif 4159 static int 4160 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4161 struct sctp_chunkhdr *ch_req) 4162 { 4163 uint16_t remaining_length, param_len, ptype; 4164 struct sctp_paramhdr pstore; 4165 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4166 uint32_t seq = 0; 4167 int num_req = 0; 4168 int trunc = 0; 4169 struct sctp_tmit_chunk *chk; 4170 struct sctp_chunkhdr *ch; 4171 struct sctp_paramhdr *ph; 4172 int ret_code = 0; 4173 int num_param = 0; 4174 4175 /* now it may be a reset or a reset-response */ 4176 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4177 4178 /* setup for adding the response */ 4179 sctp_alloc_a_chunk(stcb, chk); 4180 if (chk == NULL) { 4181 return (ret_code); 4182 } 4183 chk->copy_by_ref = 0; 4184 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4185 chk->rec.chunk_id.can_take_data = 0; 4186 chk->flags = 0; 4187 chk->asoc = &stcb->asoc; 4188 chk->no_fr_allowed = 0; 4189 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4190 chk->book_size_scale = 0; 4191 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4192 if (chk->data == NULL) { 4193 strres_nochunk: 4194 if (chk->data) { 4195 sctp_m_freem(chk->data); 4196 chk->data = NULL; 4197 } 4198 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4199 return (ret_code); 4200 } 4201 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4202 4203 /* setup chunk parameters */ 4204 chk->sent = SCTP_DATAGRAM_UNSENT; 4205 chk->snd_count = 0; 4206 chk->whoTo = NULL; 4207 4208 ch = mtod(chk->data, struct sctp_chunkhdr *); 4209 ch->chunk_type = SCTP_STREAM_RESET; 4210 ch->chunk_flags = 0; 4211 ch->chunk_length = htons(chk->send_size); 4212 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4213 offset += sizeof(struct sctp_chunkhdr); 4214 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4215 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4216 if (ph == NULL) { 4217 /* TSNH */ 4218 break; 4219 } 4220 param_len = ntohs(ph->param_length); 4221 if ((param_len > remaining_length) || 4222 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4223 /* bad parameter length */ 4224 break; 4225 } 4226 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4227 (uint8_t *)&cstore); 4228 if (ph == NULL) { 4229 /* TSNH */ 4230 break; 4231 } 4232 ptype = ntohs(ph->param_type); 4233 num_param++; 4234 if (param_len > sizeof(cstore)) { 4235 trunc = 1; 4236 } else { 4237 trunc = 0; 4238 } 4239 if (num_param > SCTP_MAX_RESET_PARAMS) { 4240 /* hit the max of parameters already sorry.. */ 4241 break; 4242 } 4243 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4244 struct sctp_stream_reset_out_request *req_out; 4245 4246 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4247 break; 4248 } 4249 req_out = (struct sctp_stream_reset_out_request *)ph; 4250 num_req++; 4251 if (stcb->asoc.stream_reset_outstanding) { 4252 seq = ntohl(req_out->response_seq); 4253 if (seq == stcb->asoc.str_reset_seq_out) { 4254 /* implicit ack */ 4255 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4256 } 4257 } 4258 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4259 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4260 struct sctp_stream_reset_add_strm *str_add; 4261 4262 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4263 break; 4264 } 4265 str_add = (struct sctp_stream_reset_add_strm *)ph; 4266 num_req++; 4267 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4268 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4269 struct sctp_stream_reset_add_strm *str_add; 4270 4271 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4272 break; 4273 } 4274 str_add = (struct sctp_stream_reset_add_strm *)ph; 4275 num_req++; 4276 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4277 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4278 struct sctp_stream_reset_in_request *req_in; 4279 4280 num_req++; 4281 req_in = (struct sctp_stream_reset_in_request *)ph; 4282 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4283 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4284 struct sctp_stream_reset_tsn_request *req_tsn; 4285 4286 num_req++; 4287 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4288 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4289 ret_code = 1; 4290 goto strres_nochunk; 4291 } 4292 /* no more */ 4293 break; 4294 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4295 struct sctp_stream_reset_response *resp; 4296 uint32_t result; 4297 4298 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4299 break; 4300 } 4301 resp = (struct sctp_stream_reset_response *)ph; 4302 seq = ntohl(resp->response_seq); 4303 result = ntohl(resp->result); 4304 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4305 ret_code = 1; 4306 goto strres_nochunk; 4307 } 4308 } else { 4309 break; 4310 } 4311 offset += SCTP_SIZE32(param_len); 4312 if (remaining_length >= SCTP_SIZE32(param_len)) { 4313 remaining_length -= SCTP_SIZE32(param_len); 4314 } else { 4315 remaining_length = 0; 4316 } 4317 } 4318 if (num_req == 0) { 4319 /* we have no response free the stuff */ 4320 goto strres_nochunk; 4321 } 4322 /* ok we have a chunk to link in */ 4323 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4324 chk, 4325 sctp_next); 4326 stcb->asoc.ctrl_queue_cnt++; 4327 return (ret_code); 4328 } 4329 4330 /* 4331 * Handle a router or endpoints report of a packet loss, there are two ways 4332 * to handle this, either we get the whole packet and must disect it 4333 * ourselves (possibly with truncation and or corruption) or it is a summary 4334 * from a middle box that did the disectting for us. 4335 */ 4336 static void 4337 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4338 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4339 { 4340 uint32_t bottle_bw, on_queue; 4341 uint16_t trunc_len; 4342 unsigned int chlen; 4343 unsigned int at; 4344 struct sctp_chunk_desc desc; 4345 struct sctp_chunkhdr *ch; 4346 4347 chlen = ntohs(cp->ch.chunk_length); 4348 chlen -= sizeof(struct sctp_pktdrop_chunk); 4349 /* XXX possible chlen underflow */ 4350 if (chlen == 0) { 4351 ch = NULL; 4352 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4353 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4354 } else { 4355 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4356 chlen -= sizeof(struct sctphdr); 4357 /* XXX possible chlen underflow */ 4358 memset(&desc, 0, sizeof(desc)); 4359 } 4360 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4361 if (trunc_len > limit) { 4362 trunc_len = limit; 4363 } 4364 /* now the chunks themselves */ 4365 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4366 desc.chunk_type = ch->chunk_type; 4367 /* get amount we need to move */ 4368 at = ntohs(ch->chunk_length); 4369 if (at < sizeof(struct sctp_chunkhdr)) { 4370 /* corrupt chunk, maybe at the end? */ 4371 SCTP_STAT_INCR(sctps_pdrpcrupt); 4372 break; 4373 } 4374 if (trunc_len == 0) { 4375 /* we are supposed to have all of it */ 4376 if (at > chlen) { 4377 /* corrupt skip it */ 4378 SCTP_STAT_INCR(sctps_pdrpcrupt); 4379 break; 4380 } 4381 } else { 4382 /* is there enough of it left ? */ 4383 if (desc.chunk_type == SCTP_DATA) { 4384 if (chlen < (sizeof(struct sctp_data_chunk) + 4385 sizeof(desc.data_bytes))) { 4386 break; 4387 } 4388 } else { 4389 if (chlen < sizeof(struct sctp_chunkhdr)) { 4390 break; 4391 } 4392 } 4393 } 4394 if (desc.chunk_type == SCTP_DATA) { 4395 /* can we get out the tsn? */ 4396 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4397 SCTP_STAT_INCR(sctps_pdrpmbda); 4398 4399 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4400 /* yep */ 4401 struct sctp_data_chunk *dcp; 4402 uint8_t *ddp; 4403 unsigned int iii; 4404 4405 dcp = (struct sctp_data_chunk *)ch; 4406 ddp = (uint8_t *)(dcp + 1); 4407 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4408 desc.data_bytes[iii] = ddp[iii]; 4409 } 4410 desc.tsn_ifany = dcp->dp.tsn; 4411 } else { 4412 /* nope we are done. */ 4413 SCTP_STAT_INCR(sctps_pdrpnedat); 4414 break; 4415 } 4416 } else { 4417 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4418 SCTP_STAT_INCR(sctps_pdrpmbct); 4419 } 4420 4421 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4422 SCTP_STAT_INCR(sctps_pdrppdbrk); 4423 break; 4424 } 4425 if (SCTP_SIZE32(at) > chlen) { 4426 break; 4427 } 4428 chlen -= SCTP_SIZE32(at); 4429 if (chlen < sizeof(struct sctp_chunkhdr)) { 4430 /* done, none left */ 4431 break; 4432 } 4433 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4434 } 4435 /* Now update any rwnd --- possibly */ 4436 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4437 /* From a peer, we get a rwnd report */ 4438 uint32_t a_rwnd; 4439 4440 SCTP_STAT_INCR(sctps_pdrpfehos); 4441 4442 bottle_bw = ntohl(cp->bottle_bw); 4443 on_queue = ntohl(cp->current_onq); 4444 if (bottle_bw && on_queue) { 4445 /* a rwnd report is in here */ 4446 if (bottle_bw > on_queue) 4447 a_rwnd = bottle_bw - on_queue; 4448 else 4449 a_rwnd = 0; 4450 4451 if (a_rwnd == 0) 4452 stcb->asoc.peers_rwnd = 0; 4453 else { 4454 if (a_rwnd > stcb->asoc.total_flight) { 4455 stcb->asoc.peers_rwnd = 4456 a_rwnd - stcb->asoc.total_flight; 4457 } else { 4458 stcb->asoc.peers_rwnd = 0; 4459 } 4460 if (stcb->asoc.peers_rwnd < 4461 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4462 /* SWS sender side engages */ 4463 stcb->asoc.peers_rwnd = 0; 4464 } 4465 } 4466 } 4467 } else { 4468 SCTP_STAT_INCR(sctps_pdrpfmbox); 4469 } 4470 4471 /* now middle boxes in sat networks get a cwnd bump */ 4472 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4473 (stcb->asoc.sat_t3_loss_recovery == 0) && 4474 (stcb->asoc.sat_network)) { 4475 /* 4476 * This is debatable but for sat networks it makes sense 4477 * Note if a T3 timer has went off, we will prohibit any 4478 * changes to cwnd until we exit the t3 loss recovery. 4479 */ 4480 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4481 net, cp, &bottle_bw, &on_queue); 4482 } 4483 } 4484 4485 /* 4486 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4487 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4488 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4489 * length of the complete packet outputs: - length: modified to remaining 4490 * length after control processing - netp: modified to new sctp_nets after 4491 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4492 * bad packet,...) otherwise return the tcb for this packet 4493 */ 4494 #ifdef __GNUC__ 4495 __attribute__((noinline)) 4496 #endif 4497 static struct sctp_tcb * 4498 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4499 struct sockaddr *src, struct sockaddr *dst, 4500 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4501 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4502 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4503 uint32_t vrf_id, uint16_t port) 4504 { 4505 struct sctp_association *asoc; 4506 struct mbuf *op_err; 4507 char msg[SCTP_DIAG_INFO_LEN]; 4508 uint32_t vtag_in; 4509 int num_chunks = 0; /* number of control chunks processed */ 4510 uint32_t chk_length; 4511 int ret; 4512 int abort_no_unlock = 0; 4513 int ecne_seen = 0; 4514 4515 /* 4516 * How big should this be, and should it be alloc'd? Lets try the 4517 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4518 * until we get into jumbo grams and such.. 4519 */ 4520 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4521 struct sctp_tcb *locked_tcb = stcb; 4522 int got_auth = 0; 4523 uint32_t auth_offset = 0, auth_len = 0; 4524 int auth_skipped = 0; 4525 int asconf_cnt = 0; 4526 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4527 struct socket *so; 4528 #endif 4529 4530 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4531 iphlen, *offset, length, (void *)stcb); 4532 4533 /* validate chunk header length... */ 4534 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4535 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4536 ntohs(ch->chunk_length)); 4537 if (locked_tcb) { 4538 SCTP_TCB_UNLOCK(locked_tcb); 4539 } 4540 return (NULL); 4541 } 4542 /* 4543 * validate the verification tag 4544 */ 4545 vtag_in = ntohl(sh->v_tag); 4546 4547 if (locked_tcb) { 4548 SCTP_TCB_LOCK_ASSERT(locked_tcb); 4549 } 4550 if (ch->chunk_type == SCTP_INITIATION) { 4551 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4552 ntohs(ch->chunk_length), vtag_in); 4553 if (vtag_in != 0) { 4554 /* protocol error- silently discard... */ 4555 SCTP_STAT_INCR(sctps_badvtag); 4556 if (locked_tcb) { 4557 SCTP_TCB_UNLOCK(locked_tcb); 4558 } 4559 return (NULL); 4560 } 4561 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4562 /* 4563 * If there is no stcb, skip the AUTH chunk and process 4564 * later after a stcb is found (to validate the lookup was 4565 * valid. 4566 */ 4567 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4568 (stcb == NULL) && 4569 (inp->auth_supported == 1)) { 4570 /* save this chunk for later processing */ 4571 auth_skipped = 1; 4572 auth_offset = *offset; 4573 auth_len = ntohs(ch->chunk_length); 4574 4575 /* (temporarily) move past this chunk */ 4576 *offset += SCTP_SIZE32(auth_len); 4577 if (*offset >= length) { 4578 /* no more data left in the mbuf chain */ 4579 *offset = length; 4580 if (locked_tcb) { 4581 SCTP_TCB_UNLOCK(locked_tcb); 4582 } 4583 return (NULL); 4584 } 4585 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4586 sizeof(struct sctp_chunkhdr), chunk_buf); 4587 } 4588 if (ch == NULL) { 4589 /* Help */ 4590 *offset = length; 4591 if (locked_tcb) { 4592 SCTP_TCB_UNLOCK(locked_tcb); 4593 } 4594 return (NULL); 4595 } 4596 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4597 goto process_control_chunks; 4598 } 4599 /* 4600 * first check if it's an ASCONF with an unknown src addr we 4601 * need to look inside to find the association 4602 */ 4603 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4604 struct sctp_chunkhdr *asconf_ch = ch; 4605 uint32_t asconf_offset = 0, asconf_len = 0; 4606 4607 /* inp's refcount may be reduced */ 4608 SCTP_INP_INCR_REF(inp); 4609 4610 asconf_offset = *offset; 4611 do { 4612 asconf_len = ntohs(asconf_ch->chunk_length); 4613 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4614 break; 4615 stcb = sctp_findassociation_ep_asconf(m, 4616 *offset, 4617 dst, 4618 sh, &inp, netp, vrf_id); 4619 if (stcb != NULL) 4620 break; 4621 asconf_offset += SCTP_SIZE32(asconf_len); 4622 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4623 sizeof(struct sctp_chunkhdr), chunk_buf); 4624 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4625 if (stcb == NULL) { 4626 /* 4627 * reduce inp's refcount if not reduced in 4628 * sctp_findassociation_ep_asconf(). 4629 */ 4630 SCTP_INP_DECR_REF(inp); 4631 } else { 4632 locked_tcb = stcb; 4633 } 4634 4635 /* now go back and verify any auth chunk to be sure */ 4636 if (auth_skipped && (stcb != NULL)) { 4637 struct sctp_auth_chunk *auth; 4638 4639 auth = (struct sctp_auth_chunk *) 4640 sctp_m_getptr(m, auth_offset, 4641 auth_len, chunk_buf); 4642 got_auth = 1; 4643 auth_skipped = 0; 4644 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4645 auth_offset)) { 4646 /* auth HMAC failed so dump it */ 4647 *offset = length; 4648 if (locked_tcb) { 4649 SCTP_TCB_UNLOCK(locked_tcb); 4650 } 4651 return (NULL); 4652 } else { 4653 /* remaining chunks are HMAC checked */ 4654 stcb->asoc.authenticated = 1; 4655 } 4656 } 4657 } 4658 if (stcb == NULL) { 4659 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4660 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4661 msg); 4662 /* no association, so it's out of the blue... */ 4663 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4664 mflowtype, mflowid, inp->fibnum, 4665 vrf_id, port); 4666 *offset = length; 4667 if (locked_tcb) { 4668 SCTP_TCB_UNLOCK(locked_tcb); 4669 } 4670 return (NULL); 4671 } 4672 asoc = &stcb->asoc; 4673 /* ABORT and SHUTDOWN can use either v_tag... */ 4674 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4675 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4676 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4677 /* Take the T-bit always into account. */ 4678 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4679 (vtag_in == asoc->my_vtag)) || 4680 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4681 (asoc->peer_vtag != htonl(0)) && 4682 (vtag_in == asoc->peer_vtag))) { 4683 /* this is valid */ 4684 } else { 4685 /* drop this packet... */ 4686 SCTP_STAT_INCR(sctps_badvtag); 4687 if (locked_tcb) { 4688 SCTP_TCB_UNLOCK(locked_tcb); 4689 } 4690 return (NULL); 4691 } 4692 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4693 if (vtag_in != asoc->my_vtag) { 4694 /* 4695 * this could be a stale SHUTDOWN-ACK or the 4696 * peer never got the SHUTDOWN-COMPLETE and 4697 * is still hung; we have started a new asoc 4698 * but it won't complete until the shutdown 4699 * is completed 4700 */ 4701 if (locked_tcb) { 4702 SCTP_TCB_UNLOCK(locked_tcb); 4703 } 4704 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4705 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4706 msg); 4707 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4708 sh, inp, op_err, 4709 mflowtype, mflowid, fibnum, 4710 vrf_id, port); 4711 return (NULL); 4712 } 4713 } else { 4714 /* for all other chunks, vtag must match */ 4715 if (vtag_in != asoc->my_vtag) { 4716 /* invalid vtag... */ 4717 SCTPDBG(SCTP_DEBUG_INPUT3, 4718 "invalid vtag: %xh, expect %xh\n", 4719 vtag_in, asoc->my_vtag); 4720 SCTP_STAT_INCR(sctps_badvtag); 4721 if (locked_tcb) { 4722 SCTP_TCB_UNLOCK(locked_tcb); 4723 } 4724 *offset = length; 4725 return (NULL); 4726 } 4727 } 4728 } /* end if !SCTP_COOKIE_ECHO */ 4729 /* 4730 * process all control chunks... 4731 */ 4732 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4733 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4734 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4735 (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED)) { 4736 /* implied cookie-ack.. we must have lost the ack */ 4737 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 4738 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 4739 stcb->asoc.overall_error_count, 4740 0, 4741 SCTP_FROM_SCTP_INPUT, 4742 __LINE__); 4743 } 4744 stcb->asoc.overall_error_count = 0; 4745 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4746 *netp); 4747 } 4748 process_control_chunks: 4749 while (IS_SCTP_CONTROL(ch)) { 4750 /* validate chunk length */ 4751 chk_length = ntohs(ch->chunk_length); 4752 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4753 ch->chunk_type, chk_length); 4754 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4755 if (chk_length < sizeof(*ch) || 4756 (*offset + (int)chk_length) > length) { 4757 *offset = length; 4758 if (locked_tcb) { 4759 SCTP_TCB_UNLOCK(locked_tcb); 4760 } 4761 return (NULL); 4762 } 4763 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4764 /* 4765 * INIT-ACK only gets the init ack "header" portion only 4766 * because we don't have to process the peer's COOKIE. All 4767 * others get a complete chunk. 4768 */ 4769 if ((ch->chunk_type == SCTP_INITIATION_ACK) || 4770 (ch->chunk_type == SCTP_INITIATION)) { 4771 /* get an init-ack chunk */ 4772 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4773 sizeof(struct sctp_init_ack_chunk), chunk_buf); 4774 if (ch == NULL) { 4775 *offset = length; 4776 if (locked_tcb) { 4777 SCTP_TCB_UNLOCK(locked_tcb); 4778 } 4779 return (NULL); 4780 } 4781 } else { 4782 /* For cookies and all other chunks. */ 4783 if (chk_length > sizeof(chunk_buf)) { 4784 /* 4785 * use just the size of the chunk buffer so 4786 * the front part of our chunks fit in 4787 * contiguous space up to the chunk buffer 4788 * size (508 bytes). For chunks that need to 4789 * get more than that they must use the 4790 * sctp_m_getptr() function or other means 4791 * (e.g. know how to parse mbuf chains). 4792 * Cookies do this already. 4793 */ 4794 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4795 (sizeof(chunk_buf) - 4), 4796 chunk_buf); 4797 if (ch == NULL) { 4798 *offset = length; 4799 if (locked_tcb) { 4800 SCTP_TCB_UNLOCK(locked_tcb); 4801 } 4802 return (NULL); 4803 } 4804 } else { 4805 /* We can fit it all */ 4806 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4807 chk_length, chunk_buf); 4808 if (ch == NULL) { 4809 SCTP_PRINTF("sctp_process_control: Can't get the all data....\n"); 4810 *offset = length; 4811 if (locked_tcb) { 4812 SCTP_TCB_UNLOCK(locked_tcb); 4813 } 4814 return (NULL); 4815 } 4816 } 4817 } 4818 num_chunks++; 4819 /* Save off the last place we got a control from */ 4820 if (stcb != NULL) { 4821 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4822 /* 4823 * allow last_control to be NULL if 4824 * ASCONF... ASCONF processing will find the 4825 * right net later 4826 */ 4827 if ((netp != NULL) && (*netp != NULL)) 4828 stcb->asoc.last_control_chunk_from = *netp; 4829 } 4830 } 4831 #ifdef SCTP_AUDITING_ENABLED 4832 sctp_audit_log(0xB0, ch->chunk_type); 4833 #endif 4834 4835 /* check to see if this chunk required auth, but isn't */ 4836 if ((stcb != NULL) && 4837 (stcb->asoc.auth_supported == 1) && 4838 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4839 !stcb->asoc.authenticated) { 4840 /* "silently" ignore */ 4841 SCTP_STAT_INCR(sctps_recvauthmissing); 4842 goto next_chunk; 4843 } 4844 switch (ch->chunk_type) { 4845 case SCTP_INITIATION: 4846 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4847 /* The INIT chunk must be the only chunk. */ 4848 if ((num_chunks > 1) || 4849 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4850 /* RFC 4960 requires that no ABORT is sent */ 4851 *offset = length; 4852 if (locked_tcb) { 4853 SCTP_TCB_UNLOCK(locked_tcb); 4854 } 4855 return (NULL); 4856 } 4857 /* Honor our resource limit. */ 4858 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4859 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4860 sctp_abort_association(inp, stcb, m, iphlen, 4861 src, dst, sh, op_err, 4862 mflowtype, mflowid, 4863 vrf_id, port); 4864 *offset = length; 4865 return (NULL); 4866 } 4867 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4868 (struct sctp_init_chunk *)ch, inp, 4869 stcb, *netp, &abort_no_unlock, 4870 mflowtype, mflowid, 4871 vrf_id, port); 4872 *offset = length; 4873 if ((!abort_no_unlock) && (locked_tcb)) { 4874 SCTP_TCB_UNLOCK(locked_tcb); 4875 } 4876 return (NULL); 4877 break; 4878 case SCTP_PAD_CHUNK: 4879 break; 4880 case SCTP_INITIATION_ACK: 4881 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT-ACK\n"); 4882 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4883 /* We are not interested anymore */ 4884 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4885 ; 4886 } else { 4887 if ((locked_tcb != NULL) && (locked_tcb != stcb)) { 4888 /* Very unlikely */ 4889 SCTP_TCB_UNLOCK(locked_tcb); 4890 } 4891 *offset = length; 4892 if (stcb) { 4893 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4894 so = SCTP_INP_SO(inp); 4895 atomic_add_int(&stcb->asoc.refcnt, 1); 4896 SCTP_TCB_UNLOCK(stcb); 4897 SCTP_SOCKET_LOCK(so, 1); 4898 SCTP_TCB_LOCK(stcb); 4899 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4900 #endif 4901 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4902 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4903 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4904 SCTP_SOCKET_UNLOCK(so, 1); 4905 #endif 4906 } 4907 return (NULL); 4908 } 4909 } 4910 /* The INIT-ACK chunk must be the only chunk. */ 4911 if ((num_chunks > 1) || 4912 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4913 *offset = length; 4914 if (locked_tcb) { 4915 SCTP_TCB_UNLOCK(locked_tcb); 4916 } 4917 return (NULL); 4918 } 4919 if ((netp) && (*netp)) { 4920 ret = sctp_handle_init_ack(m, iphlen, *offset, 4921 src, dst, sh, 4922 (struct sctp_init_ack_chunk *)ch, 4923 stcb, *netp, 4924 &abort_no_unlock, 4925 mflowtype, mflowid, 4926 vrf_id); 4927 } else { 4928 ret = -1; 4929 } 4930 *offset = length; 4931 if (abort_no_unlock) { 4932 return (NULL); 4933 } 4934 /* 4935 * Special case, I must call the output routine to 4936 * get the cookie echoed 4937 */ 4938 if ((stcb != NULL) && (ret == 0)) { 4939 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4940 } 4941 if (locked_tcb) { 4942 SCTP_TCB_UNLOCK(locked_tcb); 4943 } 4944 return (NULL); 4945 break; 4946 case SCTP_SELECTIVE_ACK: 4947 { 4948 struct sctp_sack_chunk *sack; 4949 int abort_now = 0; 4950 uint32_t a_rwnd, cum_ack; 4951 uint16_t num_seg, num_dup; 4952 uint8_t flags; 4953 int offset_seg, offset_dup; 4954 4955 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK\n"); 4956 SCTP_STAT_INCR(sctps_recvsacks); 4957 if (stcb == NULL) { 4958 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing SACK chunk\n"); 4959 break; 4960 } 4961 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4962 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4963 break; 4964 } 4965 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4966 /*- 4967 * If we have sent a shutdown-ack, we will pay no 4968 * attention to a sack sent in to us since 4969 * we don't care anymore. 4970 */ 4971 break; 4972 } 4973 sack = (struct sctp_sack_chunk *)ch; 4974 flags = ch->chunk_flags; 4975 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4976 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4977 num_dup = ntohs(sack->sack.num_dup_tsns); 4978 a_rwnd = (uint32_t)ntohl(sack->sack.a_rwnd); 4979 if (sizeof(struct sctp_sack_chunk) + 4980 num_seg * sizeof(struct sctp_gap_ack_block) + 4981 num_dup * sizeof(uint32_t) != chk_length) { 4982 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4983 break; 4984 } 4985 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4986 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4987 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4988 cum_ack, num_seg, a_rwnd); 4989 stcb->asoc.seen_a_sack_this_pkt = 1; 4990 if ((stcb->asoc.pr_sctp_cnt == 0) && 4991 (num_seg == 0) && 4992 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4993 (stcb->asoc.saw_sack_with_frags == 0) && 4994 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4995 (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) 4996 ) { 4997 /* 4998 * We have a SIMPLE sack having no 4999 * prior segments and data on sent 5000 * queue to be acked.. Use the 5001 * faster path sack processing. We 5002 * also allow window update sacks 5003 * with no missing segments to go 5004 * this way too. 5005 */ 5006 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, &abort_now, ecne_seen); 5007 } else { 5008 if (netp && *netp) 5009 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5010 num_seg, 0, num_dup, &abort_now, flags, 5011 cum_ack, a_rwnd, ecne_seen); 5012 } 5013 if (abort_now) { 5014 /* ABORT signal from sack processing */ 5015 *offset = length; 5016 return (NULL); 5017 } 5018 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5019 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5020 (stcb->asoc.stream_queue_cnt == 0)) { 5021 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5022 } 5023 } 5024 break; 5025 /* 5026 * EY - nr_sack: If the received chunk is an 5027 * nr_sack chunk 5028 */ 5029 case SCTP_NR_SELECTIVE_ACK: 5030 { 5031 struct sctp_nr_sack_chunk *nr_sack; 5032 int abort_now = 0; 5033 uint32_t a_rwnd, cum_ack; 5034 uint16_t num_seg, num_nr_seg, num_dup; 5035 uint8_t flags; 5036 int offset_seg, offset_dup; 5037 5038 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK\n"); 5039 SCTP_STAT_INCR(sctps_recvsacks); 5040 if (stcb == NULL) { 5041 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing NR-SACK chunk\n"); 5042 break; 5043 } 5044 if (stcb->asoc.nrsack_supported == 0) { 5045 goto unknown_chunk; 5046 } 5047 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 5048 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR-SACK chunk, too small\n"); 5049 break; 5050 } 5051 if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 5052 /*- 5053 * If we have sent a shutdown-ack, we will pay no 5054 * attention to a sack sent in to us since 5055 * we don't care anymore. 5056 */ 5057 break; 5058 } 5059 nr_sack = (struct sctp_nr_sack_chunk *)ch; 5060 flags = ch->chunk_flags; 5061 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 5062 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 5063 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 5064 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 5065 a_rwnd = (uint32_t)ntohl(nr_sack->nr_sack.a_rwnd); 5066 if (sizeof(struct sctp_nr_sack_chunk) + 5067 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 5068 num_dup * sizeof(uint32_t) != chk_length) { 5069 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5070 break; 5071 } 5072 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5073 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 5074 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_NR_SACK process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5075 cum_ack, num_seg, a_rwnd); 5076 stcb->asoc.seen_a_sack_this_pkt = 1; 5077 if ((stcb->asoc.pr_sctp_cnt == 0) && 5078 (num_seg == 0) && (num_nr_seg == 0) && 5079 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5080 (stcb->asoc.saw_sack_with_frags == 0) && 5081 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5082 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5083 /* 5084 * We have a SIMPLE sack having no 5085 * prior segments and data on sent 5086 * queue to be acked. Use the faster 5087 * path sack processing. We also 5088 * allow window update sacks with no 5089 * missing segments to go this way 5090 * too. 5091 */ 5092 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5093 &abort_now, ecne_seen); 5094 } else { 5095 if (netp && *netp) 5096 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5097 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5098 cum_ack, a_rwnd, ecne_seen); 5099 } 5100 if (abort_now) { 5101 /* ABORT signal from sack processing */ 5102 *offset = length; 5103 return (NULL); 5104 } 5105 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5106 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5107 (stcb->asoc.stream_queue_cnt == 0)) { 5108 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5109 } 5110 } 5111 break; 5112 5113 case SCTP_HEARTBEAT_REQUEST: 5114 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5115 if ((stcb) && netp && *netp) { 5116 SCTP_STAT_INCR(sctps_recvheartbeat); 5117 sctp_send_heartbeat_ack(stcb, m, *offset, 5118 chk_length, *netp); 5119 5120 /* He's alive so give him credit */ 5121 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5122 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5123 stcb->asoc.overall_error_count, 5124 0, 5125 SCTP_FROM_SCTP_INPUT, 5126 __LINE__); 5127 } 5128 stcb->asoc.overall_error_count = 0; 5129 } 5130 break; 5131 case SCTP_HEARTBEAT_ACK: 5132 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT-ACK\n"); 5133 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5134 /* Its not ours */ 5135 *offset = length; 5136 if (locked_tcb) { 5137 SCTP_TCB_UNLOCK(locked_tcb); 5138 } 5139 return (NULL); 5140 } 5141 /* He's alive so give him credit */ 5142 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5143 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5144 stcb->asoc.overall_error_count, 5145 0, 5146 SCTP_FROM_SCTP_INPUT, 5147 __LINE__); 5148 } 5149 stcb->asoc.overall_error_count = 0; 5150 SCTP_STAT_INCR(sctps_recvheartbeatack); 5151 if (netp && *netp) 5152 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5153 stcb, *netp); 5154 break; 5155 case SCTP_ABORT_ASSOCIATION: 5156 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5157 (void *)stcb); 5158 if ((stcb) && netp && *netp) 5159 sctp_handle_abort((struct sctp_abort_chunk *)ch, 5160 stcb, *netp); 5161 *offset = length; 5162 return (NULL); 5163 break; 5164 case SCTP_SHUTDOWN: 5165 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5166 (void *)stcb); 5167 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5168 *offset = length; 5169 if (locked_tcb) { 5170 SCTP_TCB_UNLOCK(locked_tcb); 5171 } 5172 return (NULL); 5173 } 5174 if (netp && *netp) { 5175 int abort_flag = 0; 5176 5177 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5178 stcb, *netp, &abort_flag); 5179 if (abort_flag) { 5180 *offset = length; 5181 return (NULL); 5182 } 5183 } 5184 break; 5185 case SCTP_SHUTDOWN_ACK: 5186 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-ACK, stcb %p\n", (void *)stcb); 5187 if ((stcb) && (netp) && (*netp)) 5188 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5189 *offset = length; 5190 return (NULL); 5191 break; 5192 5193 case SCTP_OPERATION_ERROR: 5194 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP-ERR\n"); 5195 if ((stcb) && netp && *netp && sctp_handle_error(ch, stcb, *netp) < 0) { 5196 *offset = length; 5197 return (NULL); 5198 } 5199 break; 5200 case SCTP_COOKIE_ECHO: 5201 SCTPDBG(SCTP_DEBUG_INPUT3, 5202 "SCTP_COOKIE-ECHO, stcb %p\n", (void *)stcb); 5203 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5204 ; 5205 } else { 5206 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5207 /* We are not interested anymore */ 5208 abend: 5209 if (stcb) { 5210 SCTP_TCB_UNLOCK(stcb); 5211 } 5212 *offset = length; 5213 return (NULL); 5214 } 5215 } 5216 /*- 5217 * First are we accepting? We do this again here 5218 * since it is possible that a previous endpoint WAS 5219 * listening responded to a INIT-ACK and then 5220 * closed. We opened and bound.. and are now no 5221 * longer listening. 5222 * 5223 * XXXGL: notes on checking listen queue length. 5224 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5225 * SOLISTENING(), because a listening "UDP type" 5226 * socket isn't listening in terms of the socket 5227 * layer. It is a normal data flow socket, that 5228 * can fork off new connections. Thus, we should 5229 * look into sol_qlen only in case we are !UDP. 5230 * 2) Checking sol_qlen in general requires locking 5231 * the socket, and this code lacks that. 5232 */ 5233 if ((stcb == NULL) && 5234 (!SCTP_IS_LISTENING(inp) || 5235 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5236 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5237 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5238 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5239 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5240 sctp_abort_association(inp, stcb, m, iphlen, 5241 src, dst, sh, op_err, 5242 mflowtype, mflowid, 5243 vrf_id, port); 5244 } 5245 *offset = length; 5246 return (NULL); 5247 } else { 5248 struct mbuf *ret_buf; 5249 struct sctp_inpcb *linp; 5250 5251 if (stcb) { 5252 linp = NULL; 5253 } else { 5254 linp = inp; 5255 } 5256 5257 if (linp) { 5258 SCTP_ASOC_CREATE_LOCK(linp); 5259 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5260 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5261 SCTP_ASOC_CREATE_UNLOCK(linp); 5262 goto abend; 5263 } 5264 } 5265 if (netp) { 5266 ret_buf = 5267 sctp_handle_cookie_echo(m, iphlen, 5268 *offset, 5269 src, dst, 5270 sh, 5271 (struct sctp_cookie_echo_chunk *)ch, 5272 &inp, &stcb, netp, 5273 auth_skipped, 5274 auth_offset, 5275 auth_len, 5276 &locked_tcb, 5277 mflowtype, 5278 mflowid, 5279 vrf_id, 5280 port); 5281 } else { 5282 ret_buf = NULL; 5283 } 5284 if (linp) { 5285 SCTP_ASOC_CREATE_UNLOCK(linp); 5286 } 5287 if (ret_buf == NULL) { 5288 if (locked_tcb) { 5289 SCTP_TCB_UNLOCK(locked_tcb); 5290 } 5291 SCTPDBG(SCTP_DEBUG_INPUT3, 5292 "GAK, null buffer\n"); 5293 *offset = length; 5294 return (NULL); 5295 } 5296 /* if AUTH skipped, see if it verified... */ 5297 if (auth_skipped) { 5298 got_auth = 1; 5299 auth_skipped = 0; 5300 } 5301 if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) { 5302 /* 5303 * Restart the timer if we have 5304 * pending data 5305 */ 5306 struct sctp_tmit_chunk *chk; 5307 5308 chk = TAILQ_FIRST(&stcb->asoc.sent_queue); 5309 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5310 } 5311 } 5312 break; 5313 case SCTP_COOKIE_ACK: 5314 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE-ACK, stcb %p\n", (void *)stcb); 5315 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5316 if (locked_tcb) { 5317 SCTP_TCB_UNLOCK(locked_tcb); 5318 } 5319 return (NULL); 5320 } 5321 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5322 /* We are not interested anymore */ 5323 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5324 ; 5325 } else if (stcb) { 5326 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5327 so = SCTP_INP_SO(inp); 5328 atomic_add_int(&stcb->asoc.refcnt, 1); 5329 SCTP_TCB_UNLOCK(stcb); 5330 SCTP_SOCKET_LOCK(so, 1); 5331 SCTP_TCB_LOCK(stcb); 5332 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5333 #endif 5334 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5335 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 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 (stcb->asoc.ecn_supported == 0) { 5369 goto unknown_chunk; 5370 } 5371 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5372 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5373 stcb->asoc.overall_error_count, 5374 0, 5375 SCTP_FROM_SCTP_INPUT, 5376 __LINE__); 5377 } 5378 stcb->asoc.overall_error_count = 0; 5379 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, 5380 stcb); 5381 ecne_seen = 1; 5382 } 5383 break; 5384 case SCTP_ECN_CWR: 5385 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN-CWR\n"); 5386 /* He's alive so give him credit */ 5387 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5388 /* Its not ours */ 5389 if (locked_tcb) { 5390 SCTP_TCB_UNLOCK(locked_tcb); 5391 } 5392 *offset = length; 5393 return (NULL); 5394 } 5395 if (stcb) { 5396 if (stcb->asoc.ecn_supported == 0) { 5397 goto unknown_chunk; 5398 } 5399 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5400 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5401 stcb->asoc.overall_error_count, 5402 0, 5403 SCTP_FROM_SCTP_INPUT, 5404 __LINE__); 5405 } 5406 stcb->asoc.overall_error_count = 0; 5407 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5408 } 5409 break; 5410 case SCTP_SHUTDOWN_COMPLETE: 5411 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN-COMPLETE, stcb %p\n", (void *)stcb); 5412 /* must be first and only chunk */ 5413 if ((num_chunks > 1) || 5414 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5415 *offset = length; 5416 if (locked_tcb) { 5417 SCTP_TCB_UNLOCK(locked_tcb); 5418 } 5419 return (NULL); 5420 } 5421 if ((stcb) && netp && *netp) { 5422 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5423 stcb, *netp); 5424 } 5425 *offset = length; 5426 return (NULL); 5427 break; 5428 case SCTP_ASCONF: 5429 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5430 /* He's alive so give him credit */ 5431 if (stcb) { 5432 if (stcb->asoc.asconf_supported == 0) { 5433 goto unknown_chunk; 5434 } 5435 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5436 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5437 stcb->asoc.overall_error_count, 5438 0, 5439 SCTP_FROM_SCTP_INPUT, 5440 __LINE__); 5441 } 5442 stcb->asoc.overall_error_count = 0; 5443 sctp_handle_asconf(m, *offset, src, 5444 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5445 asconf_cnt++; 5446 } 5447 break; 5448 case SCTP_ASCONF_ACK: 5449 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF-ACK\n"); 5450 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5451 /* Its not ours */ 5452 if (locked_tcb) { 5453 SCTP_TCB_UNLOCK(locked_tcb); 5454 } 5455 *offset = length; 5456 return (NULL); 5457 } 5458 if ((stcb) && netp && *netp) { 5459 if (stcb->asoc.asconf_supported == 0) { 5460 goto unknown_chunk; 5461 } 5462 /* He's alive so give him credit */ 5463 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5464 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5465 stcb->asoc.overall_error_count, 5466 0, 5467 SCTP_FROM_SCTP_INPUT, 5468 __LINE__); 5469 } 5470 stcb->asoc.overall_error_count = 0; 5471 sctp_handle_asconf_ack(m, *offset, 5472 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5473 if (abort_no_unlock) 5474 return (NULL); 5475 } 5476 break; 5477 case SCTP_FORWARD_CUM_TSN: 5478 case SCTP_IFORWARD_CUM_TSN: 5479 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD-TSN\n"); 5480 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5481 /* Its not ours */ 5482 if (locked_tcb) { 5483 SCTP_TCB_UNLOCK(locked_tcb); 5484 } 5485 *offset = length; 5486 return (NULL); 5487 } 5488 /* He's alive so give him credit */ 5489 if (stcb) { 5490 int abort_flag = 0; 5491 5492 if (stcb->asoc.prsctp_supported == 0) { 5493 goto unknown_chunk; 5494 } 5495 stcb->asoc.overall_error_count = 0; 5496 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5497 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5498 stcb->asoc.overall_error_count, 5499 0, 5500 SCTP_FROM_SCTP_INPUT, 5501 __LINE__); 5502 } 5503 *fwd_tsn_seen = 1; 5504 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5505 /* We are not interested anymore */ 5506 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5507 so = SCTP_INP_SO(inp); 5508 atomic_add_int(&stcb->asoc.refcnt, 1); 5509 SCTP_TCB_UNLOCK(stcb); 5510 SCTP_SOCKET_LOCK(so, 1); 5511 SCTP_TCB_LOCK(stcb); 5512 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5513 #endif 5514 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5515 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5516 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5517 SCTP_SOCKET_UNLOCK(so, 1); 5518 #endif 5519 *offset = length; 5520 return (NULL); 5521 } 5522 /* 5523 * For sending a SACK this looks like DATA 5524 * chunks. 5525 */ 5526 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5527 sctp_handle_forward_tsn(stcb, 5528 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5529 if (abort_flag) { 5530 *offset = length; 5531 return (NULL); 5532 } else { 5533 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5534 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5535 stcb->asoc.overall_error_count, 5536 0, 5537 SCTP_FROM_SCTP_INPUT, 5538 __LINE__); 5539 } 5540 stcb->asoc.overall_error_count = 0; 5541 } 5542 5543 } 5544 break; 5545 case SCTP_STREAM_RESET: 5546 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5547 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5548 /* Its not ours */ 5549 if (locked_tcb) { 5550 SCTP_TCB_UNLOCK(locked_tcb); 5551 } 5552 *offset = length; 5553 return (NULL); 5554 } 5555 if (stcb->asoc.reconfig_supported == 0) { 5556 goto unknown_chunk; 5557 } 5558 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5559 /* stop processing */ 5560 *offset = length; 5561 return (NULL); 5562 } 5563 break; 5564 case SCTP_PACKET_DROPPED: 5565 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5566 /* re-get it all please */ 5567 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5568 /* Its not ours */ 5569 if (locked_tcb) { 5570 SCTP_TCB_UNLOCK(locked_tcb); 5571 } 5572 *offset = length; 5573 return (NULL); 5574 } 5575 if (ch && (stcb) && netp && (*netp)) { 5576 if (stcb->asoc.pktdrop_supported == 0) { 5577 goto unknown_chunk; 5578 } 5579 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5580 stcb, *netp, 5581 min(chk_length, (sizeof(chunk_buf) - 4))); 5582 5583 } 5584 break; 5585 case SCTP_AUTHENTICATION: 5586 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5587 if (stcb == NULL) { 5588 /* save the first AUTH for later processing */ 5589 if (auth_skipped == 0) { 5590 auth_offset = *offset; 5591 auth_len = chk_length; 5592 auth_skipped = 1; 5593 } 5594 /* skip this chunk (temporarily) */ 5595 goto next_chunk; 5596 } 5597 if (stcb->asoc.auth_supported == 0) { 5598 goto unknown_chunk; 5599 } 5600 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5601 (chk_length > (sizeof(struct sctp_auth_chunk) + 5602 SCTP_AUTH_DIGEST_LEN_MAX))) { 5603 /* Its not ours */ 5604 if (locked_tcb) { 5605 SCTP_TCB_UNLOCK(locked_tcb); 5606 } 5607 *offset = length; 5608 return (NULL); 5609 } 5610 if (got_auth == 1) { 5611 /* skip this chunk... it's already auth'd */ 5612 goto next_chunk; 5613 } 5614 got_auth = 1; 5615 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5616 m, *offset)) { 5617 /* auth HMAC failed so dump the packet */ 5618 *offset = length; 5619 return (stcb); 5620 } else { 5621 /* remaining chunks are HMAC checked */ 5622 stcb->asoc.authenticated = 1; 5623 } 5624 break; 5625 5626 default: 5627 unknown_chunk: 5628 /* it's an unknown chunk! */ 5629 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5630 struct sctp_gen_error_cause *cause; 5631 int len; 5632 5633 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5634 0, M_NOWAIT, 1, MT_DATA); 5635 if (op_err != NULL) { 5636 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5637 cause = mtod(op_err, struct sctp_gen_error_cause *); 5638 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5639 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5640 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5641 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5642 if (SCTP_BUF_NEXT(op_err) != NULL) { 5643 #ifdef SCTP_MBUF_LOGGING 5644 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5645 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5646 } 5647 #endif 5648 sctp_queue_op_err(stcb, op_err); 5649 } else { 5650 sctp_m_freem(op_err); 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 /* 5689 * common input chunk processing (v4 and v6) 5690 */ 5691 void 5692 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5693 struct sockaddr *src, struct sockaddr *dst, 5694 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5695 #if !defined(SCTP_WITH_NO_CSUM) 5696 uint8_t compute_crc, 5697 #endif 5698 uint8_t ecn_bits, 5699 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5700 uint32_t vrf_id, uint16_t port) 5701 { 5702 uint32_t high_tsn; 5703 int fwd_tsn_seen = 0, data_processed = 0; 5704 struct mbuf *m = *mm, *op_err; 5705 char msg[SCTP_DIAG_INFO_LEN]; 5706 int un_sent; 5707 int cnt_ctrl_ready = 0; 5708 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5709 struct sctp_tcb *stcb = NULL; 5710 struct sctp_nets *net = NULL; 5711 5712 SCTP_STAT_INCR(sctps_recvdatagrams); 5713 #ifdef SCTP_AUDITING_ENABLED 5714 sctp_audit_log(0xE0, 1); 5715 sctp_auditing(0, inp, stcb, net); 5716 #endif 5717 #if !defined(SCTP_WITH_NO_CSUM) 5718 if (compute_crc != 0) { 5719 uint32_t check, calc_check; 5720 5721 check = sh->checksum; 5722 sh->checksum = 0; 5723 calc_check = sctp_calculate_cksum(m, iphlen); 5724 sh->checksum = check; 5725 if (calc_check != check) { 5726 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5727 calc_check, check, (void *)m, length, iphlen); 5728 stcb = sctp_findassociation_addr(m, offset, src, dst, 5729 sh, ch, &inp, &net, vrf_id); 5730 #if defined(INET) || defined(INET6) 5731 if ((ch->chunk_type != SCTP_INITIATION) && 5732 (net != NULL) && (net->port != port)) { 5733 if (net->port == 0) { 5734 /* UDP encapsulation turned on. */ 5735 net->mtu -= sizeof(struct udphdr); 5736 if (stcb->asoc.smallest_mtu > net->mtu) { 5737 sctp_pathmtu_adjustment(stcb, net->mtu); 5738 } 5739 } else if (port == 0) { 5740 /* UDP encapsulation turned off. */ 5741 net->mtu += sizeof(struct udphdr); 5742 /* XXX Update smallest_mtu */ 5743 } 5744 net->port = port; 5745 } 5746 #endif 5747 if (net != NULL) { 5748 net->flowtype = mflowtype; 5749 net->flowid = mflowid; 5750 } 5751 if ((inp != NULL) && (stcb != NULL)) { 5752 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5753 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5754 } else if ((inp != NULL) && (stcb == NULL)) { 5755 inp_decr = inp; 5756 } 5757 SCTP_STAT_INCR(sctps_badsum); 5758 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5759 goto out; 5760 } 5761 } 5762 #endif 5763 /* Destination port of 0 is illegal, based on RFC4960. */ 5764 if (sh->dest_port == 0) { 5765 SCTP_STAT_INCR(sctps_hdrops); 5766 goto out; 5767 } 5768 stcb = sctp_findassociation_addr(m, offset, src, dst, 5769 sh, ch, &inp, &net, vrf_id); 5770 #if defined(INET) || defined(INET6) 5771 if ((ch->chunk_type != SCTP_INITIATION) && 5772 (net != NULL) && (net->port != port)) { 5773 if (net->port == 0) { 5774 /* UDP encapsulation turned on. */ 5775 net->mtu -= sizeof(struct udphdr); 5776 if (stcb->asoc.smallest_mtu > net->mtu) { 5777 sctp_pathmtu_adjustment(stcb, net->mtu); 5778 } 5779 } else if (port == 0) { 5780 /* UDP encapsulation turned off. */ 5781 net->mtu += sizeof(struct udphdr); 5782 /* XXX Update smallest_mtu */ 5783 } 5784 net->port = port; 5785 } 5786 #endif 5787 if (net != NULL) { 5788 net->flowtype = mflowtype; 5789 net->flowid = mflowid; 5790 } 5791 if (inp == NULL) { 5792 SCTP_STAT_INCR(sctps_noport); 5793 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5794 goto out; 5795 } 5796 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5797 sctp_send_shutdown_complete2(src, dst, sh, 5798 mflowtype, mflowid, fibnum, 5799 vrf_id, port); 5800 goto out; 5801 } 5802 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5803 goto out; 5804 } 5805 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5806 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5807 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5808 (ch->chunk_type != SCTP_INIT))) { 5809 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5810 "Out of the blue"); 5811 sctp_send_abort(m, iphlen, src, dst, 5812 sh, 0, op_err, 5813 mflowtype, mflowid, fibnum, 5814 vrf_id, port); 5815 } 5816 } 5817 goto out; 5818 } else if (stcb == NULL) { 5819 inp_decr = inp; 5820 } 5821 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5822 (void *)m, iphlen, offset, length, (void *)stcb); 5823 if (stcb) { 5824 /* always clear this before beginning a packet */ 5825 stcb->asoc.authenticated = 0; 5826 stcb->asoc.seen_a_sack_this_pkt = 0; 5827 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5828 (void *)stcb, stcb->asoc.state); 5829 5830 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5831 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5832 /*- 5833 * If we hit here, we had a ref count 5834 * up when the assoc was aborted and the 5835 * timer is clearing out the assoc, we should 5836 * NOT respond to any packet.. its OOTB. 5837 */ 5838 SCTP_TCB_UNLOCK(stcb); 5839 stcb = NULL; 5840 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5841 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5842 msg); 5843 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5844 mflowtype, mflowid, inp->fibnum, 5845 vrf_id, port); 5846 goto out; 5847 } 5848 } 5849 if (IS_SCTP_CONTROL(ch)) { 5850 /* process the control portion of the SCTP packet */ 5851 /* sa_ignore NO_NULL_CHK */ 5852 stcb = sctp_process_control(m, iphlen, &offset, length, 5853 src, dst, sh, ch, 5854 inp, stcb, &net, &fwd_tsn_seen, 5855 mflowtype, mflowid, fibnum, 5856 vrf_id, port); 5857 if (stcb) { 5858 /* 5859 * This covers us if the cookie-echo was there and 5860 * it changes our INP. 5861 */ 5862 inp = stcb->sctp_ep; 5863 #if defined(INET) || defined(INET6) 5864 if ((ch->chunk_type != SCTP_INITIATION) && 5865 (net != NULL) && (net->port != port)) { 5866 if (net->port == 0) { 5867 /* UDP encapsulation turned on. */ 5868 net->mtu -= sizeof(struct udphdr); 5869 if (stcb->asoc.smallest_mtu > net->mtu) { 5870 sctp_pathmtu_adjustment(stcb, net->mtu); 5871 } 5872 } else if (port == 0) { 5873 /* UDP encapsulation turned off. */ 5874 net->mtu += sizeof(struct udphdr); 5875 /* XXX Update smallest_mtu */ 5876 } 5877 net->port = port; 5878 } 5879 #endif 5880 } 5881 } else { 5882 /* 5883 * no control chunks, so pre-process DATA chunks (these 5884 * checks are taken care of by control processing) 5885 */ 5886 5887 /* 5888 * if DATA only packet, and auth is required, then punt... 5889 * can't have authenticated without any AUTH (control) 5890 * chunks 5891 */ 5892 if ((stcb != NULL) && 5893 (stcb->asoc.auth_supported == 1) && 5894 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5895 /* "silently" ignore */ 5896 SCTP_STAT_INCR(sctps_recvauthmissing); 5897 goto out; 5898 } 5899 if (stcb == NULL) { 5900 /* out of the blue DATA chunk */ 5901 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5902 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5903 msg); 5904 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5905 mflowtype, mflowid, fibnum, 5906 vrf_id, port); 5907 goto out; 5908 } 5909 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5910 /* v_tag mismatch! */ 5911 SCTP_STAT_INCR(sctps_badvtag); 5912 goto out; 5913 } 5914 } 5915 5916 if (stcb == NULL) { 5917 /* 5918 * no valid TCB for this packet, or we found it's a bad 5919 * packet while processing control, or we're done with this 5920 * packet (done or skip rest of data), so we drop it... 5921 */ 5922 goto out; 5923 } 5924 /* 5925 * DATA chunk processing 5926 */ 5927 /* plow through the data chunks while length > offset */ 5928 5929 /* 5930 * Rest should be DATA only. Check authentication state if AUTH for 5931 * DATA is required. 5932 */ 5933 if ((length > offset) && 5934 (stcb != NULL) && 5935 (stcb->asoc.auth_supported == 1) && 5936 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5937 !stcb->asoc.authenticated) { 5938 /* "silently" ignore */ 5939 SCTP_STAT_INCR(sctps_recvauthmissing); 5940 SCTPDBG(SCTP_DEBUG_AUTH1, 5941 "Data chunk requires AUTH, skipped\n"); 5942 goto trigger_send; 5943 } 5944 if (length > offset) { 5945 int retval; 5946 5947 /* 5948 * First check to make sure our state is correct. We would 5949 * not get here unless we really did have a tag, so we don't 5950 * abort if this happens, just dump the chunk silently. 5951 */ 5952 switch (SCTP_GET_STATE(&stcb->asoc)) { 5953 case SCTP_STATE_COOKIE_ECHOED: 5954 /* 5955 * we consider data with valid tags in this state 5956 * shows us the cookie-ack was lost. Imply it was 5957 * there. 5958 */ 5959 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5960 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5961 stcb->asoc.overall_error_count, 5962 0, 5963 SCTP_FROM_SCTP_INPUT, 5964 __LINE__); 5965 } 5966 stcb->asoc.overall_error_count = 0; 5967 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5968 break; 5969 case SCTP_STATE_COOKIE_WAIT: 5970 /* 5971 * We consider OOTB any data sent during asoc setup. 5972 */ 5973 snprintf(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5974 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5975 msg); 5976 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5977 mflowtype, mflowid, inp->fibnum, 5978 vrf_id, port); 5979 goto out; 5980 /* sa_ignore NOTREACHED */ 5981 break; 5982 case SCTP_STATE_EMPTY: /* should not happen */ 5983 case SCTP_STATE_INUSE: /* should not happen */ 5984 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5985 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5986 default: 5987 goto out; 5988 /* sa_ignore NOTREACHED */ 5989 break; 5990 case SCTP_STATE_OPEN: 5991 case SCTP_STATE_SHUTDOWN_SENT: 5992 break; 5993 } 5994 /* plow through the data chunks while length > offset */ 5995 retval = sctp_process_data(mm, iphlen, &offset, length, 5996 inp, stcb, net, &high_tsn); 5997 if (retval == 2) { 5998 /* 5999 * The association aborted, NO UNLOCK needed since 6000 * the association is destroyed. 6001 */ 6002 stcb = NULL; 6003 goto out; 6004 } 6005 data_processed = 1; 6006 /* 6007 * Anything important needs to have been m_copy'ed in 6008 * process_data 6009 */ 6010 } 6011 /* take care of ecn */ 6012 if ((data_processed == 1) && 6013 (stcb->asoc.ecn_supported == 1) && 6014 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 6015 /* Yep, we need to add a ECNE */ 6016 sctp_send_ecn_echo(stcb, net, high_tsn); 6017 } 6018 if ((data_processed == 0) && (fwd_tsn_seen)) { 6019 int was_a_gap; 6020 uint32_t highest_tsn; 6021 6022 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 6023 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 6024 } else { 6025 highest_tsn = stcb->asoc.highest_tsn_inside_map; 6026 } 6027 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 6028 stcb->asoc.send_sack = 1; 6029 sctp_sack_check(stcb, was_a_gap); 6030 } else if (fwd_tsn_seen) { 6031 stcb->asoc.send_sack = 1; 6032 } 6033 /* trigger send of any chunks in queue... */ 6034 trigger_send: 6035 #ifdef SCTP_AUDITING_ENABLED 6036 sctp_audit_log(0xE0, 2); 6037 sctp_auditing(1, inp, stcb, net); 6038 #endif 6039 SCTPDBG(SCTP_DEBUG_INPUT1, 6040 "Check for chunk output prw:%d tqe:%d tf=%d\n", 6041 stcb->asoc.peers_rwnd, 6042 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 6043 stcb->asoc.total_flight); 6044 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 6045 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 6046 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 6047 } 6048 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 6049 cnt_ctrl_ready || 6050 stcb->asoc.trigger_reset || 6051 ((un_sent) && 6052 (stcb->asoc.peers_rwnd > 0 || 6053 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 6054 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 6055 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 6056 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 6057 } 6058 #ifdef SCTP_AUDITING_ENABLED 6059 sctp_audit_log(0xE0, 3); 6060 sctp_auditing(2, inp, stcb, net); 6061 #endif 6062 out: 6063 if (stcb != NULL) { 6064 SCTP_TCB_UNLOCK(stcb); 6065 } 6066 if (inp_decr != NULL) { 6067 /* reduce ref-count */ 6068 SCTP_INP_WLOCK(inp_decr); 6069 SCTP_INP_DECR_REF(inp_decr); 6070 SCTP_INP_WUNLOCK(inp_decr); 6071 } 6072 return; 6073 } 6074 6075 #ifdef INET 6076 void 6077 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 6078 { 6079 struct mbuf *m; 6080 int iphlen; 6081 uint32_t vrf_id = 0; 6082 uint8_t ecn_bits; 6083 struct sockaddr_in src, dst; 6084 struct ip *ip; 6085 struct sctphdr *sh; 6086 struct sctp_chunkhdr *ch; 6087 int length, offset; 6088 #if !defined(SCTP_WITH_NO_CSUM) 6089 uint8_t compute_crc; 6090 #endif 6091 uint32_t mflowid; 6092 uint8_t mflowtype; 6093 uint16_t fibnum; 6094 6095 iphlen = off; 6096 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 6097 SCTP_RELEASE_PKT(i_pak); 6098 return; 6099 } 6100 m = SCTP_HEADER_TO_CHAIN(i_pak); 6101 #ifdef SCTP_MBUF_LOGGING 6102 /* Log in any input mbufs */ 6103 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 6104 sctp_log_mbc(m, SCTP_MBUF_INPUT); 6105 } 6106 #endif 6107 #ifdef SCTP_PACKET_LOGGING 6108 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 6109 sctp_packet_log(m); 6110 } 6111 #endif 6112 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 6113 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 6114 m->m_pkthdr.len, 6115 if_name(m->m_pkthdr.rcvif), 6116 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 6117 mflowid = m->m_pkthdr.flowid; 6118 mflowtype = M_HASHTYPE_GET(m); 6119 fibnum = M_GETFIB(m); 6120 SCTP_STAT_INCR(sctps_recvpackets); 6121 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 6122 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 6123 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 6124 if (SCTP_BUF_LEN(m) < offset) { 6125 if ((m = m_pullup(m, offset)) == NULL) { 6126 SCTP_STAT_INCR(sctps_hdrops); 6127 return; 6128 } 6129 } 6130 ip = mtod(m, struct ip *); 6131 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 6132 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 6133 offset -= sizeof(struct sctp_chunkhdr); 6134 memset(&src, 0, sizeof(struct sockaddr_in)); 6135 src.sin_family = AF_INET; 6136 src.sin_len = sizeof(struct sockaddr_in); 6137 src.sin_port = sh->src_port; 6138 src.sin_addr = ip->ip_src; 6139 memset(&dst, 0, sizeof(struct sockaddr_in)); 6140 dst.sin_family = AF_INET; 6141 dst.sin_len = sizeof(struct sockaddr_in); 6142 dst.sin_port = sh->dest_port; 6143 dst.sin_addr = ip->ip_dst; 6144 length = ntohs(ip->ip_len); 6145 /* Validate mbuf chain length with IP payload length. */ 6146 if (SCTP_HEADER_LEN(m) != length) { 6147 SCTPDBG(SCTP_DEBUG_INPUT1, 6148 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 6149 SCTP_STAT_INCR(sctps_hdrops); 6150 goto out; 6151 } 6152 /* SCTP does not allow broadcasts or multicasts */ 6153 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 6154 goto out; 6155 } 6156 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 6157 goto out; 6158 } 6159 ecn_bits = ip->ip_tos; 6160 #if defined(SCTP_WITH_NO_CSUM) 6161 SCTP_STAT_INCR(sctps_recvnocrc); 6162 #else 6163 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 6164 SCTP_STAT_INCR(sctps_recvhwcrc); 6165 compute_crc = 0; 6166 } else { 6167 SCTP_STAT_INCR(sctps_recvswcrc); 6168 compute_crc = 1; 6169 } 6170 #endif 6171 sctp_common_input_processing(&m, iphlen, offset, length, 6172 (struct sockaddr *)&src, 6173 (struct sockaddr *)&dst, 6174 sh, ch, 6175 #if !defined(SCTP_WITH_NO_CSUM) 6176 compute_crc, 6177 #endif 6178 ecn_bits, 6179 mflowtype, mflowid, fibnum, 6180 vrf_id, port); 6181 out: 6182 if (m) { 6183 sctp_m_freem(m); 6184 } 6185 return; 6186 } 6187 6188 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6189 extern int *sctp_cpuarry; 6190 #endif 6191 6192 int 6193 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6194 { 6195 struct mbuf *m; 6196 int off; 6197 6198 m = *mp; 6199 off = *offp; 6200 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6201 if (mp_ncpus > 1) { 6202 struct ip *ip; 6203 struct sctphdr *sh; 6204 int offset; 6205 int cpu_to_use; 6206 uint32_t flowid, tag; 6207 6208 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6209 flowid = m->m_pkthdr.flowid; 6210 } else { 6211 /* 6212 * No flow id built by lower layers fix it so we 6213 * create one. 6214 */ 6215 offset = off + sizeof(struct sctphdr); 6216 if (SCTP_BUF_LEN(m) < offset) { 6217 if ((m = m_pullup(m, offset)) == NULL) { 6218 SCTP_STAT_INCR(sctps_hdrops); 6219 return (IPPROTO_DONE); 6220 } 6221 } 6222 ip = mtod(m, struct ip *); 6223 sh = (struct sctphdr *)((caddr_t)ip + off); 6224 tag = htonl(sh->v_tag); 6225 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6226 m->m_pkthdr.flowid = flowid; 6227 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6228 } 6229 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6230 sctp_queue_to_mcore(m, off, cpu_to_use); 6231 return (IPPROTO_DONE); 6232 } 6233 #endif 6234 sctp_input_with_port(m, off, 0); 6235 return (IPPROTO_DONE); 6236 } 6237 #endif 6238