1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 59 60 static void 61 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 62 { 63 struct sctp_nets *net; 64 65 /* 66 * This now not only stops all cookie timers it also stops any INIT 67 * timers as well. This will make sure that the timers are stopped 68 * in all collision cases. 69 */ 70 SCTP_TCB_LOCK_ASSERT(stcb); 71 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 72 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 77 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 78 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 79 stcb->sctp_ep, 80 stcb, 81 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 82 } 83 } 84 } 85 86 /* INIT handler */ 87 static void 88 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 89 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 90 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 91 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 92 uint8_t mflowtype, uint32_t mflowid, 93 uint32_t vrf_id, uint16_t port) 94 { 95 struct sctp_init *init; 96 struct mbuf *op_err; 97 98 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 99 (void *)stcb); 100 if (stcb == NULL) { 101 SCTP_INP_RLOCK(inp); 102 } 103 /* validate length */ 104 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 105 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 106 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 107 mflowtype, mflowid, 108 vrf_id, port); 109 if (stcb) 110 *abort_no_unlock = 1; 111 goto outnow; 112 } 113 /* validate parameters */ 114 init = &cp->init; 115 if (init->initiate_tag == 0) { 116 /* protocol error... send abort */ 117 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 118 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 119 mflowtype, mflowid, 120 vrf_id, port); 121 if (stcb) 122 *abort_no_unlock = 1; 123 goto outnow; 124 } 125 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 126 /* invalid parameter... send abort */ 127 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 128 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 129 mflowtype, mflowid, 130 vrf_id, port); 131 if (stcb) 132 *abort_no_unlock = 1; 133 goto outnow; 134 } 135 if (init->num_inbound_streams == 0) { 136 /* protocol error... send abort */ 137 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 138 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 139 mflowtype, mflowid, 140 vrf_id, port); 141 if (stcb) 142 *abort_no_unlock = 1; 143 goto outnow; 144 } 145 if (init->num_outbound_streams == 0) { 146 /* protocol error... send abort */ 147 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 148 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 149 mflowtype, mflowid, 150 vrf_id, port); 151 if (stcb) 152 *abort_no_unlock = 1; 153 goto outnow; 154 } 155 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 156 offset + ntohs(cp->ch.chunk_length))) { 157 /* auth parameter(s) error... send abort */ 158 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 159 "Problem with AUTH parameters"); 160 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 161 mflowtype, mflowid, 162 vrf_id, port); 163 if (stcb) 164 *abort_no_unlock = 1; 165 goto outnow; 166 } 167 /* We are only accepting if we have a listening socket. */ 168 if ((stcb == NULL) && 169 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 170 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 171 (!SCTP_IS_LISTENING(inp)))) { 172 /* 173 * FIX ME ?? What about TCP model and we have a 174 * match/restart case? Actually no fix is needed. the lookup 175 * will always find the existing assoc so stcb would not be 176 * NULL. It may be questionable to do this since we COULD 177 * just send back the INIT-ACK and hope that the app did 178 * accept()'s by the time the COOKIE was sent. But there is 179 * a price to pay for COOKIE generation and I don't want to 180 * pay it on the chance that the app will actually do some 181 * accepts(). The App just looses and should NOT be in this 182 * state :-) 183 */ 184 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 185 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 186 "No listener"); 187 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 188 mflowtype, mflowid, inp->fibnum, 189 vrf_id, port); 190 } 191 goto outnow; 192 } 193 if ((stcb != NULL) && 194 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 195 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 196 sctp_send_shutdown_ack(stcb, NULL); 197 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 198 } else { 199 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 200 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 201 src, dst, sh, cp, 202 mflowtype, mflowid, 203 vrf_id, port); 204 } 205 outnow: 206 if (stcb == NULL) { 207 SCTP_INP_RUNLOCK(inp); 208 } 209 } 210 211 /* 212 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 213 */ 214 215 int 216 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked 217 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING) 218 SCTP_UNUSED 219 #endif 220 ) 221 { 222 int unsent_data; 223 unsigned int i; 224 struct sctp_stream_queue_pending *sp; 225 struct sctp_association *asoc; 226 227 /* 228 * This function returns if any stream has true unsent data on it. 229 * Note that as it looks through it will clean up any places that 230 * have old data that has been sent but left at top of stream queue. 231 */ 232 asoc = &stcb->asoc; 233 unsent_data = 0; 234 SCTP_TCB_SEND_LOCK(stcb); 235 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 236 /* Check to see if some data queued */ 237 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 238 /* sa_ignore FREED_MEMORY */ 239 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 240 if (sp == NULL) { 241 continue; 242 } 243 if ((sp->msg_is_complete) && 244 (sp->length == 0) && 245 (sp->sender_all_done)) { 246 /* 247 * We are doing differed cleanup. Last time 248 * through when we took all the data the 249 * sender_all_done was not set. 250 */ 251 if (sp->put_last_out == 0) { 252 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 253 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 254 sp->sender_all_done, 255 sp->length, 256 sp->msg_is_complete, 257 sp->put_last_out); 258 } 259 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 260 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 261 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 262 if (sp->net) { 263 sctp_free_remote_addr(sp->net); 264 sp->net = NULL; 265 } 266 if (sp->data) { 267 sctp_m_freem(sp->data); 268 sp->data = NULL; 269 } 270 sctp_free_a_strmoq(stcb, sp, so_locked); 271 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 272 unsent_data++; 273 } 274 } else { 275 unsent_data++; 276 } 277 if (unsent_data > 0) { 278 break; 279 } 280 } 281 } 282 SCTP_TCB_SEND_UNLOCK(stcb); 283 return (unsent_data); 284 } 285 286 static int 287 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 288 { 289 struct sctp_init *init; 290 struct sctp_association *asoc; 291 struct sctp_nets *lnet; 292 unsigned int i; 293 294 init = &cp->init; 295 asoc = &stcb->asoc; 296 /* save off parameters */ 297 asoc->peer_vtag = ntohl(init->initiate_tag); 298 asoc->peers_rwnd = ntohl(init->a_rwnd); 299 /* init tsn's */ 300 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 301 302 if (!TAILQ_EMPTY(&asoc->nets)) { 303 /* update any ssthresh's that may have a default */ 304 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 305 lnet->ssthresh = asoc->peers_rwnd; 306 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 307 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 308 } 309 310 } 311 } 312 SCTP_TCB_SEND_LOCK(stcb); 313 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 314 unsigned int newcnt; 315 struct sctp_stream_out *outs; 316 struct sctp_stream_queue_pending *sp, *nsp; 317 struct sctp_tmit_chunk *chk, *nchk; 318 319 /* abandon the upper streams */ 320 newcnt = ntohs(init->num_inbound_streams); 321 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 322 if (chk->rec.data.sid >= newcnt) { 323 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 324 asoc->send_queue_cnt--; 325 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 326 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 327 #ifdef INVARIANTS 328 } else { 329 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 330 #endif 331 } 332 if (chk->data != NULL) { 333 sctp_free_bufspace(stcb, asoc, chk, 1); 334 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 335 0, chk, SCTP_SO_NOT_LOCKED); 336 if (chk->data) { 337 sctp_m_freem(chk->data); 338 chk->data = NULL; 339 } 340 } 341 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 342 /* sa_ignore FREED_MEMORY */ 343 } 344 } 345 if (asoc->strmout) { 346 for (i = newcnt; i < asoc->pre_open_streams; i++) { 347 outs = &asoc->strmout[i]; 348 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 349 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 350 TAILQ_REMOVE(&outs->outqueue, sp, next); 351 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 352 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 353 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 354 if (sp->data) { 355 sctp_m_freem(sp->data); 356 sp->data = NULL; 357 } 358 if (sp->net) { 359 sctp_free_remote_addr(sp->net); 360 sp->net = NULL; 361 } 362 /* Free the chunk */ 363 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 364 /* sa_ignore FREED_MEMORY */ 365 } 366 outs->state = SCTP_STREAM_CLOSED; 367 } 368 } 369 /* cut back the count */ 370 asoc->pre_open_streams = newcnt; 371 } 372 SCTP_TCB_SEND_UNLOCK(stcb); 373 asoc->streamoutcnt = asoc->pre_open_streams; 374 if (asoc->strmout) { 375 for (i = 0; i < asoc->streamoutcnt; i++) { 376 asoc->strmout[i].state = SCTP_STREAM_OPEN; 377 } 378 } 379 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 380 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 381 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 382 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 383 } 384 /* This is the next one we expect */ 385 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 386 387 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 388 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 389 390 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 391 /* open the requested streams */ 392 393 if (asoc->strmin != NULL) { 394 /* Free the old ones */ 395 for (i = 0; i < asoc->streamincnt; i++) { 396 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 397 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 398 } 399 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 400 } 401 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 402 asoc->streamincnt = ntohs(init->num_outbound_streams); 403 } else { 404 asoc->streamincnt = asoc->max_inbound_streams; 405 } 406 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 407 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 408 if (asoc->strmin == NULL) { 409 /* we didn't get memory for the streams! */ 410 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 411 return (-1); 412 } 413 for (i = 0; i < asoc->streamincnt; i++) { 414 asoc->strmin[i].sid = i; 415 asoc->strmin[i].last_mid_delivered = 0xffffffff; 416 TAILQ_INIT(&asoc->strmin[i].inqueue); 417 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 418 asoc->strmin[i].pd_api_started = 0; 419 asoc->strmin[i].delivery_started = 0; 420 } 421 /* 422 * load_address_from_init will put the addresses into the 423 * association when the COOKIE is processed or the INIT-ACK is 424 * processed. Both types of COOKIE's existing and new call this 425 * routine. It will remove addresses that are no longer in the 426 * association (for the restarting case where addresses are 427 * removed). Up front when the INIT arrives we will discard it if it 428 * is a restart and new addresses have been added. 429 */ 430 /* sa_ignore MEMLEAK */ 431 return (0); 432 } 433 434 /* 435 * INIT-ACK message processing/consumption returns value < 0 on error 436 */ 437 static int 438 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 439 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 440 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 441 struct sctp_nets *net, int *abort_no_unlock, 442 uint8_t mflowtype, uint32_t mflowid, 443 uint32_t vrf_id) 444 { 445 struct sctp_association *asoc; 446 struct mbuf *op_err; 447 int retval, abort_flag, cookie_found; 448 int initack_limit; 449 int nat_friendly = 0; 450 451 /* First verify that we have no illegal param's */ 452 abort_flag = 0; 453 cookie_found = 0; 454 455 op_err = sctp_arethere_unrecognized_parameters(m, 456 (offset + sizeof(struct sctp_init_chunk)), 457 &abort_flag, (struct sctp_chunkhdr *)cp, 458 &nat_friendly, &cookie_found); 459 if (abort_flag) { 460 /* Send an abort and notify peer */ 461 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 462 *abort_no_unlock = 1; 463 return (-1); 464 } 465 if (!cookie_found) { 466 uint16_t len; 467 468 /* Only report the missing cookie parameter */ 469 if (op_err != NULL) { 470 sctp_m_freem(op_err); 471 } 472 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 473 /* We abort with an error of missing mandatory param */ 474 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 475 if (op_err != NULL) { 476 struct sctp_error_missing_param *cause; 477 478 SCTP_BUF_LEN(op_err) = len; 479 cause = mtod(op_err, struct sctp_error_missing_param *); 480 /* Subtract the reserved param */ 481 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 482 cause->cause.length = htons(len); 483 cause->num_missing_params = htonl(1); 484 cause->type[0] = htons(SCTP_STATE_COOKIE); 485 } 486 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 487 src, dst, sh, op_err, 488 mflowtype, mflowid, 489 vrf_id, net->port); 490 *abort_no_unlock = 1; 491 return (-3); 492 } 493 asoc = &stcb->asoc; 494 asoc->peer_supports_nat = (uint8_t)nat_friendly; 495 /* process the peer's parameters in the INIT-ACK */ 496 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 497 if (retval < 0) { 498 if (op_err != NULL) { 499 sctp_m_freem(op_err); 500 } 501 return (retval); 502 } 503 initack_limit = offset + ntohs(cp->ch.chunk_length); 504 /* load all addresses */ 505 if ((retval = sctp_load_addresses_from_init(stcb, m, 506 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 507 src, dst, NULL, stcb->asoc.port))) { 508 if (op_err != NULL) { 509 sctp_m_freem(op_err); 510 } 511 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 512 "Problem with address parameters"); 513 SCTPDBG(SCTP_DEBUG_INPUT1, 514 "Load addresses from INIT causes an abort %d\n", 515 retval); 516 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 517 src, dst, sh, op_err, 518 mflowtype, mflowid, 519 vrf_id, net->port); 520 *abort_no_unlock = 1; 521 return (-1); 522 } 523 /* if the peer doesn't support asconf, flush the asconf queue */ 524 if (asoc->asconf_supported == 0) { 525 struct sctp_asconf_addr *param, *nparam; 526 527 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 528 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 529 SCTP_FREE(param, SCTP_M_ASC_ADDR); 530 } 531 } 532 533 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 534 stcb->asoc.local_hmacs); 535 if (op_err) { 536 sctp_queue_op_err(stcb, op_err); 537 /* queuing will steal away the mbuf chain to the out queue */ 538 op_err = NULL; 539 } 540 /* extract the cookie and queue it to "echo" it back... */ 541 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 542 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 543 stcb->asoc.overall_error_count, 544 0, 545 SCTP_FROM_SCTP_INPUT, 546 __LINE__); 547 } 548 stcb->asoc.overall_error_count = 0; 549 net->error_count = 0; 550 551 /* 552 * Cancel the INIT timer, We do this first before queueing the 553 * cookie. We always cancel at the primary to assue that we are 554 * canceling the timer started by the INIT which always goes to the 555 * primary. 556 */ 557 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 558 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 559 560 /* calculate the RTO */ 561 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 562 SCTP_RTT_FROM_NON_DATA); 563 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 564 return (retval); 565 } 566 567 static void 568 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 569 struct sctp_tcb *stcb, struct sctp_nets *net) 570 { 571 union sctp_sockstore store; 572 struct sctp_nets *r_net, *f_net; 573 struct timeval tv; 574 int req_prim = 0; 575 uint16_t old_error_counter; 576 577 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 578 /* Invalid length */ 579 return; 580 } 581 582 memset(&store, 0, sizeof(store)); 583 switch (cp->heartbeat.hb_info.addr_family) { 584 #ifdef INET 585 case AF_INET: 586 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 587 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 588 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 589 store.sin.sin_port = stcb->rport; 590 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 591 sizeof(store.sin.sin_addr)); 592 } else { 593 return; 594 } 595 break; 596 #endif 597 #ifdef INET6 598 case AF_INET6: 599 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 600 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 601 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 602 store.sin6.sin6_port = stcb->rport; 603 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 604 } else { 605 return; 606 } 607 break; 608 #endif 609 default: 610 return; 611 } 612 r_net = sctp_findnet(stcb, &store.sa); 613 if (r_net == NULL) { 614 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 615 return; 616 } 617 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 618 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 619 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 620 /* 621 * If the its a HB and it's random value is correct when can 622 * confirm the destination. 623 */ 624 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 625 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 626 stcb->asoc.primary_destination = r_net; 627 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 628 f_net = TAILQ_FIRST(&stcb->asoc.nets); 629 if (f_net != r_net) { 630 /* 631 * first one on the list is NOT the primary 632 * sctp_cmpaddr() is much more efficient if 633 * the primary is the first on the list, 634 * make it so. 635 */ 636 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 637 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 638 } 639 req_prim = 1; 640 } 641 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 642 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 643 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 644 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 645 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 646 } 647 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 648 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 649 stcb->asoc.overall_error_count, 650 0, 651 SCTP_FROM_SCTP_INPUT, 652 __LINE__); 653 } 654 stcb->asoc.overall_error_count = 0; 655 old_error_counter = r_net->error_count; 656 r_net->error_count = 0; 657 r_net->hb_responded = 1; 658 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 659 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 660 /* Now lets do a RTO with this */ 661 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 662 SCTP_RTT_FROM_NON_DATA); 663 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 664 r_net->dest_state |= SCTP_ADDR_REACHABLE; 665 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 666 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 667 } 668 if (r_net->dest_state & SCTP_ADDR_PF) { 669 r_net->dest_state &= ~SCTP_ADDR_PF; 670 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 671 } 672 if (old_error_counter > 0) { 673 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 674 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 675 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 676 } 677 if (r_net == stcb->asoc.primary_destination) { 678 if (stcb->asoc.alternate) { 679 /* release the alternate, primary is good */ 680 sctp_free_remote_addr(stcb->asoc.alternate); 681 stcb->asoc.alternate = NULL; 682 } 683 } 684 /* Mobility adaptation */ 685 if (req_prim) { 686 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 687 SCTP_MOBILITY_BASE) || 688 sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) && 690 sctp_is_mobility_feature_on(stcb->sctp_ep, 691 SCTP_MOBILITY_PRIM_DELETED)) { 692 693 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 694 stcb->sctp_ep, stcb, NULL, 695 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 696 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 697 SCTP_MOBILITY_FASTHANDOFF)) { 698 sctp_assoc_immediate_retrans(stcb, 699 stcb->asoc.primary_destination); 700 } 701 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 702 SCTP_MOBILITY_BASE)) { 703 sctp_move_chunks_from_net(stcb, 704 stcb->asoc.deleted_primary); 705 } 706 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 707 } 708 } 709 } 710 711 static int 712 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 713 { 714 /* 715 * Return 0 means we want you to proceed with the abort non-zero 716 * means no abort processing. 717 */ 718 uint32_t new_vtag; 719 struct sctpasochead *head; 720 721 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 722 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 723 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 724 atomic_add_int(&stcb->asoc.refcnt, 1); 725 SCTP_TCB_UNLOCK(stcb); 726 SCTP_INP_INFO_WLOCK(); 727 SCTP_TCB_LOCK(stcb); 728 atomic_subtract_int(&stcb->asoc.refcnt, 1); 729 } else { 730 return (0); 731 } 732 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 733 /* generate a new vtag and send init */ 734 LIST_REMOVE(stcb, sctp_asocs); 735 stcb->asoc.my_vtag = new_vtag; 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_INP_INFO_WUNLOCK(); 743 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 744 return (1); 745 } else { 746 /* 747 * treat like a case where the cookie expired i.e.: - dump 748 * current cookie. - generate a new vtag. - resend init. 749 */ 750 /* generate a new vtag and send init */ 751 LIST_REMOVE(stcb, sctp_asocs); 752 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 753 sctp_stop_all_cookie_timers(stcb); 754 sctp_toss_old_cookies(stcb, &stcb->asoc); 755 stcb->asoc.my_vtag = new_vtag; 756 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 757 /* 758 * put it in the bucket in the vtag hash of assoc's for the 759 * system 760 */ 761 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 762 SCTP_INP_INFO_WUNLOCK(); 763 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 764 return (1); 765 } 766 return (0); 767 } 768 769 static int 770 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 771 struct sctp_nets *net) 772 { 773 /* 774 * return 0 means we want you to proceed with the abort non-zero 775 * means no abort processing 776 */ 777 if (stcb->asoc.auth_supported == 0) { 778 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 779 return (0); 780 } 781 sctp_asconf_send_nat_state_update(stcb, net); 782 return (1); 783 } 784 785 786 /* Returns 1 if the stcb was aborted, 0 otherwise */ 787 static int 788 sctp_handle_abort(struct sctp_abort_chunk *abort, 789 struct sctp_tcb *stcb, struct sctp_nets *net) 790 { 791 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 792 struct socket *so; 793 #endif 794 uint16_t len; 795 uint16_t error; 796 797 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 798 if (stcb == NULL) 799 return (0); 800 801 len = ntohs(abort->ch.chunk_length); 802 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 803 /* 804 * Need to check the cause codes for our two magic nat 805 * aborts which don't kill the assoc necessarily. 806 */ 807 struct sctp_error_cause *cause; 808 809 cause = (struct sctp_error_cause *)(abort + 1); 810 error = ntohs(cause->code); 811 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 812 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags:%x\n", 813 abort->ch.chunk_flags); 814 if (sctp_handle_nat_colliding_state(stcb)) { 815 return (0); 816 } 817 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 818 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags:%x\n", 819 abort->ch.chunk_flags); 820 if (sctp_handle_nat_missing_state(stcb, net)) { 821 return (0); 822 } 823 } 824 } else { 825 error = 0; 826 } 827 /* stop any receive timers */ 828 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 829 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 830 /* notify user of the abort and clean up... */ 831 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 832 /* free the tcb */ 833 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 834 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 835 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 836 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 837 } 838 #ifdef SCTP_ASOCLOG_OF_TSNS 839 sctp_print_out_track_log(stcb); 840 #endif 841 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 842 so = SCTP_INP_SO(stcb->sctp_ep); 843 atomic_add_int(&stcb->asoc.refcnt, 1); 844 SCTP_TCB_UNLOCK(stcb); 845 SCTP_SOCKET_LOCK(so, 1); 846 SCTP_TCB_LOCK(stcb); 847 atomic_subtract_int(&stcb->asoc.refcnt, 1); 848 #endif 849 SCTP_ADD_SUBSTATE(stcb, SCTP_STATE_WAS_ABORTED); 850 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 851 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 853 SCTP_SOCKET_UNLOCK(so, 1); 854 #endif 855 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 856 return (1); 857 } 858 859 static void 860 sctp_start_net_timers(struct sctp_tcb *stcb) 861 { 862 uint32_t cnt_hb_sent; 863 struct sctp_nets *net; 864 865 cnt_hb_sent = 0; 866 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 867 /* 868 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 869 * If the dest in unconfirmed send a hb as well if under 870 * max_hb_burst have been sent. 871 */ 872 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 873 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 874 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 875 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 876 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 877 cnt_hb_sent++; 878 } 879 } 880 if (cnt_hb_sent) { 881 sctp_chunk_output(stcb->sctp_ep, stcb, 882 SCTP_OUTPUT_FROM_COOKIE_ACK, 883 SCTP_SO_NOT_LOCKED); 884 } 885 } 886 887 888 static void 889 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 890 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 891 { 892 struct sctp_association *asoc; 893 int some_on_streamwheel; 894 int old_state; 895 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 896 struct socket *so; 897 #endif 898 899 SCTPDBG(SCTP_DEBUG_INPUT2, 900 "sctp_handle_shutdown: handling SHUTDOWN\n"); 901 if (stcb == NULL) 902 return; 903 asoc = &stcb->asoc; 904 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 905 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 906 return; 907 } 908 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 909 /* Shutdown NOT the expected size */ 910 return; 911 } 912 old_state = SCTP_GET_STATE(stcb); 913 sctp_update_acked(stcb, cp, abort_flag); 914 if (*abort_flag) { 915 return; 916 } 917 if (asoc->control_pdapi) { 918 /* 919 * With a normal shutdown we assume the end of last record. 920 */ 921 SCTP_INP_READ_LOCK(stcb->sctp_ep); 922 if (asoc->control_pdapi->on_strm_q) { 923 struct sctp_stream_in *strm; 924 925 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 926 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 927 /* Unordered */ 928 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 929 asoc->control_pdapi->on_strm_q = 0; 930 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 931 /* Ordered */ 932 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 933 asoc->control_pdapi->on_strm_q = 0; 934 #ifdef INVARIANTS 935 } else { 936 panic("Unknown state on ctrl:%p on_strm_q:%d", 937 asoc->control_pdapi, 938 asoc->control_pdapi->on_strm_q); 939 #endif 940 } 941 } 942 asoc->control_pdapi->end_added = 1; 943 asoc->control_pdapi->pdapi_aborted = 1; 944 asoc->control_pdapi = NULL; 945 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 946 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 947 so = SCTP_INP_SO(stcb->sctp_ep); 948 atomic_add_int(&stcb->asoc.refcnt, 1); 949 SCTP_TCB_UNLOCK(stcb); 950 SCTP_SOCKET_LOCK(so, 1); 951 SCTP_TCB_LOCK(stcb); 952 atomic_subtract_int(&stcb->asoc.refcnt, 1); 953 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 954 /* assoc was freed while we were unlocked */ 955 SCTP_SOCKET_UNLOCK(so, 1); 956 return; 957 } 958 #endif 959 if (stcb->sctp_socket) { 960 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 961 } 962 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 963 SCTP_SOCKET_UNLOCK(so, 1); 964 #endif 965 } 966 /* goto SHUTDOWN_RECEIVED state to block new requests */ 967 if (stcb->sctp_socket) { 968 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 969 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 970 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 971 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 972 /* 973 * notify upper layer that peer has initiated a 974 * shutdown 975 */ 976 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 977 978 /* reset time */ 979 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 980 } 981 } 982 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 983 /* 984 * stop the shutdown timer, since we WILL move to 985 * SHUTDOWN-ACK-SENT. 986 */ 987 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 988 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 989 } 990 /* Now is there unsent data on a stream somewhere? */ 991 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 992 993 if (!TAILQ_EMPTY(&asoc->send_queue) || 994 !TAILQ_EMPTY(&asoc->sent_queue) || 995 some_on_streamwheel) { 996 /* By returning we will push more data out */ 997 return; 998 } else { 999 /* no outstanding data to send, so move on... */ 1000 /* send SHUTDOWN-ACK */ 1001 /* move to SHUTDOWN-ACK-SENT state */ 1002 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 1003 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 1004 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 1005 } 1006 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 1007 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 1008 sctp_stop_timers_for_shutdown(stcb); 1009 sctp_send_shutdown_ack(stcb, net); 1010 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 1011 stcb->sctp_ep, stcb, net); 1012 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1013 sctp_send_shutdown_ack(stcb, net); 1014 } 1015 } 1016 } 1017 1018 static void 1019 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 1020 struct sctp_tcb *stcb, 1021 struct sctp_nets *net) 1022 { 1023 struct sctp_association *asoc; 1024 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1025 struct socket *so; 1026 1027 so = SCTP_INP_SO(stcb->sctp_ep); 1028 #endif 1029 SCTPDBG(SCTP_DEBUG_INPUT2, 1030 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 1031 if (stcb == NULL) 1032 return; 1033 1034 asoc = &stcb->asoc; 1035 /* process according to association state */ 1036 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1037 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1038 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 1039 sctp_send_shutdown_complete(stcb, net, 1); 1040 SCTP_TCB_UNLOCK(stcb); 1041 return; 1042 } 1043 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 1044 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 1045 /* unexpected SHUTDOWN-ACK... so ignore... */ 1046 SCTP_TCB_UNLOCK(stcb); 1047 return; 1048 } 1049 if (asoc->control_pdapi) { 1050 /* 1051 * With a normal shutdown we assume the end of last record. 1052 */ 1053 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1054 asoc->control_pdapi->end_added = 1; 1055 asoc->control_pdapi->pdapi_aborted = 1; 1056 asoc->control_pdapi = NULL; 1057 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1058 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1059 atomic_add_int(&stcb->asoc.refcnt, 1); 1060 SCTP_TCB_UNLOCK(stcb); 1061 SCTP_SOCKET_LOCK(so, 1); 1062 SCTP_TCB_LOCK(stcb); 1063 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1064 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1065 /* assoc was freed while we were unlocked */ 1066 SCTP_SOCKET_UNLOCK(so, 1); 1067 return; 1068 } 1069 #endif 1070 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1071 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1072 SCTP_SOCKET_UNLOCK(so, 1); 1073 #endif 1074 } 1075 #ifdef INVARIANTS 1076 if (!TAILQ_EMPTY(&asoc->send_queue) || 1077 !TAILQ_EMPTY(&asoc->sent_queue) || 1078 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1079 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1080 } 1081 #endif 1082 /* stop the timer */ 1083 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1084 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1085 /* send SHUTDOWN-COMPLETE */ 1086 sctp_send_shutdown_complete(stcb, net, 0); 1087 /* notify upper layer protocol */ 1088 if (stcb->sctp_socket) { 1089 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1090 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1091 stcb->sctp_socket->so_snd.sb_cc = 0; 1092 } 1093 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1094 } 1095 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1096 /* free the TCB but first save off the ep */ 1097 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1098 atomic_add_int(&stcb->asoc.refcnt, 1); 1099 SCTP_TCB_UNLOCK(stcb); 1100 SCTP_SOCKET_LOCK(so, 1); 1101 SCTP_TCB_LOCK(stcb); 1102 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1103 #endif 1104 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1105 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1106 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1107 SCTP_SOCKET_UNLOCK(so, 1); 1108 #endif 1109 } 1110 1111 static void 1112 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1113 { 1114 switch (chunk_type) { 1115 case SCTP_ASCONF_ACK: 1116 case SCTP_ASCONF: 1117 sctp_asconf_cleanup(stcb); 1118 break; 1119 case SCTP_IFORWARD_CUM_TSN: 1120 case SCTP_FORWARD_CUM_TSN: 1121 stcb->asoc.prsctp_supported = 0; 1122 break; 1123 default: 1124 SCTPDBG(SCTP_DEBUG_INPUT2, 1125 "Peer does not support chunk type %d (0x%x).\n", 1126 chunk_type, chunk_type); 1127 break; 1128 } 1129 } 1130 1131 /* 1132 * Skip past the param header and then we will find the param that caused the 1133 * problem. There are a number of param's in a ASCONF OR the prsctp param 1134 * these will turn of specific features. 1135 * XXX: Is this the right thing to do? 1136 */ 1137 static void 1138 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1139 { 1140 switch (parameter_type) { 1141 /* pr-sctp draft */ 1142 case SCTP_PRSCTP_SUPPORTED: 1143 stcb->asoc.prsctp_supported = 0; 1144 break; 1145 case SCTP_SUPPORTED_CHUNK_EXT: 1146 break; 1147 /* draft-ietf-tsvwg-addip-sctp */ 1148 case SCTP_HAS_NAT_SUPPORT: 1149 stcb->asoc.peer_supports_nat = 0; 1150 break; 1151 case SCTP_ADD_IP_ADDRESS: 1152 case SCTP_DEL_IP_ADDRESS: 1153 case SCTP_SET_PRIM_ADDR: 1154 stcb->asoc.asconf_supported = 0; 1155 break; 1156 case SCTP_SUCCESS_REPORT: 1157 case SCTP_ERROR_CAUSE_IND: 1158 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1159 SCTPDBG(SCTP_DEBUG_INPUT2, 1160 "Turning off ASCONF to this strange peer\n"); 1161 stcb->asoc.asconf_supported = 0; 1162 break; 1163 default: 1164 SCTPDBG(SCTP_DEBUG_INPUT2, 1165 "Peer does not support param type %d (0x%x)??\n", 1166 parameter_type, parameter_type); 1167 break; 1168 } 1169 } 1170 1171 static int 1172 sctp_handle_error(struct sctp_chunkhdr *ch, 1173 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1174 { 1175 struct sctp_error_cause *cause; 1176 struct sctp_association *asoc; 1177 uint32_t remaining_length, adjust; 1178 uint16_t code, cause_code, cause_length; 1179 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1180 struct socket *so; 1181 #endif 1182 1183 /* parse through all of the errors and process */ 1184 asoc = &stcb->asoc; 1185 cause = (struct sctp_error_cause *)((caddr_t)ch + 1186 sizeof(struct sctp_chunkhdr)); 1187 remaining_length = ntohs(ch->chunk_length); 1188 if (remaining_length > limit) { 1189 remaining_length = limit; 1190 } 1191 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1192 remaining_length -= sizeof(struct sctp_chunkhdr); 1193 } else { 1194 remaining_length = 0; 1195 } 1196 code = 0; 1197 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1198 /* Process an Error Cause */ 1199 cause_code = ntohs(cause->code); 1200 cause_length = ntohs(cause->length); 1201 if ((cause_length > remaining_length) || (cause_length == 0)) { 1202 /* Invalid cause length, possibly due to truncation. */ 1203 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1204 remaining_length, cause_length); 1205 return (0); 1206 } 1207 if (code == 0) { 1208 /* report the first error cause */ 1209 code = cause_code; 1210 } 1211 switch (cause_code) { 1212 case SCTP_CAUSE_INVALID_STREAM: 1213 case SCTP_CAUSE_MISSING_PARAM: 1214 case SCTP_CAUSE_INVALID_PARAM: 1215 case SCTP_CAUSE_NO_USER_DATA: 1216 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1217 cause_code); 1218 break; 1219 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1220 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state abort flags: %x\n", 1221 ch->chunk_flags); 1222 if (sctp_handle_nat_colliding_state(stcb)) { 1223 return (0); 1224 } 1225 break; 1226 case SCTP_CAUSE_NAT_MISSING_STATE: 1227 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state abort flags: %x\n", 1228 ch->chunk_flags); 1229 if (sctp_handle_nat_missing_state(stcb, net)) { 1230 return (0); 1231 } 1232 break; 1233 case SCTP_CAUSE_STALE_COOKIE: 1234 /* 1235 * We only act if we have echoed a cookie and are 1236 * waiting. 1237 */ 1238 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1239 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1240 struct sctp_error_stale_cookie *stale_cookie; 1241 1242 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1243 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1244 /* Double it to be more robust on RTX */ 1245 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1246 asoc->cookie_preserve_req *= 2; 1247 } else { 1248 asoc->cookie_preserve_req = UINT32_MAX; 1249 } 1250 asoc->stale_cookie_count++; 1251 if (asoc->stale_cookie_count > 1252 asoc->max_init_times) { 1253 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1254 /* now free the asoc */ 1255 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1256 so = SCTP_INP_SO(stcb->sctp_ep); 1257 atomic_add_int(&stcb->asoc.refcnt, 1); 1258 SCTP_TCB_UNLOCK(stcb); 1259 SCTP_SOCKET_LOCK(so, 1); 1260 SCTP_TCB_LOCK(stcb); 1261 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1262 #endif 1263 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1264 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1265 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1266 SCTP_SOCKET_UNLOCK(so, 1); 1267 #endif 1268 return (-1); 1269 } 1270 /* blast back to INIT state */ 1271 sctp_toss_old_cookies(stcb, &stcb->asoc); 1272 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1273 sctp_stop_all_cookie_timers(stcb); 1274 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1275 } 1276 break; 1277 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1278 /* 1279 * Nothing we can do here, we don't do hostname 1280 * addresses so if the peer does not like my IPv6 1281 * (or IPv4 for that matter) it does not matter. If 1282 * they don't support that type of address, they can 1283 * NOT possibly get that packet type... i.e. with no 1284 * IPv6 you can't receive a IPv6 packet. so we can 1285 * safely ignore this one. If we ever added support 1286 * for HOSTNAME Addresses, then we would need to do 1287 * something here. 1288 */ 1289 break; 1290 case SCTP_CAUSE_UNRECOG_CHUNK: 1291 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1292 struct sctp_error_unrecognized_chunk *unrec_chunk; 1293 1294 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1295 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1296 } 1297 break; 1298 case SCTP_CAUSE_UNRECOG_PARAM: 1299 /* XXX: We only consider the first parameter */ 1300 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1301 struct sctp_paramhdr *unrec_parameter; 1302 1303 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1304 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1305 } 1306 break; 1307 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1308 /* 1309 * We ignore this since the timer will drive out a 1310 * new cookie anyway and there timer will drive us 1311 * to send a SHUTDOWN_COMPLETE. We can't send one 1312 * here since we don't have their tag. 1313 */ 1314 break; 1315 case SCTP_CAUSE_DELETING_LAST_ADDR: 1316 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1317 case SCTP_CAUSE_DELETING_SRC_ADDR: 1318 /* 1319 * We should NOT get these here, but in a 1320 * ASCONF-ACK. 1321 */ 1322 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1323 cause_code); 1324 break; 1325 case SCTP_CAUSE_OUT_OF_RESC: 1326 /* 1327 * And what, pray tell do we do with the fact that 1328 * the peer is out of resources? Not really sure we 1329 * could do anything but abort. I suspect this 1330 * should have came WITH an abort instead of in a 1331 * OP-ERROR. 1332 */ 1333 break; 1334 default: 1335 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1336 cause_code); 1337 break; 1338 } 1339 adjust = SCTP_SIZE32(cause_length); 1340 if (remaining_length >= adjust) { 1341 remaining_length -= adjust; 1342 } else { 1343 remaining_length = 0; 1344 } 1345 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1346 } 1347 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1348 return (0); 1349 } 1350 1351 static int 1352 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1353 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1354 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1355 struct sctp_nets *net, int *abort_no_unlock, 1356 uint8_t mflowtype, uint32_t mflowid, 1357 uint32_t vrf_id) 1358 { 1359 struct sctp_init_ack *init_ack; 1360 struct mbuf *op_err; 1361 1362 SCTPDBG(SCTP_DEBUG_INPUT2, 1363 "sctp_handle_init_ack: handling INIT-ACK\n"); 1364 1365 if (stcb == NULL) { 1366 SCTPDBG(SCTP_DEBUG_INPUT2, 1367 "sctp_handle_init_ack: TCB is null\n"); 1368 return (-1); 1369 } 1370 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1371 /* Invalid length */ 1372 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1373 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1374 src, dst, sh, op_err, 1375 mflowtype, mflowid, 1376 vrf_id, net->port); 1377 *abort_no_unlock = 1; 1378 return (-1); 1379 } 1380 init_ack = &cp->init; 1381 /* validate parameters */ 1382 if (init_ack->initiate_tag == 0) { 1383 /* protocol error... send an abort */ 1384 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1385 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1386 src, dst, sh, op_err, 1387 mflowtype, mflowid, 1388 vrf_id, net->port); 1389 *abort_no_unlock = 1; 1390 return (-1); 1391 } 1392 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1393 /* protocol error... send an abort */ 1394 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1395 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1396 src, dst, sh, op_err, 1397 mflowtype, mflowid, 1398 vrf_id, net->port); 1399 *abort_no_unlock = 1; 1400 return (-1); 1401 } 1402 if (init_ack->num_inbound_streams == 0) { 1403 /* protocol error... send an abort */ 1404 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1405 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1406 src, dst, sh, op_err, 1407 mflowtype, mflowid, 1408 vrf_id, net->port); 1409 *abort_no_unlock = 1; 1410 return (-1); 1411 } 1412 if (init_ack->num_outbound_streams == 0) { 1413 /* protocol error... send an abort */ 1414 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1415 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1416 src, dst, sh, op_err, 1417 mflowtype, mflowid, 1418 vrf_id, net->port); 1419 *abort_no_unlock = 1; 1420 return (-1); 1421 } 1422 /* process according to association state... */ 1423 switch (SCTP_GET_STATE(stcb)) { 1424 case SCTP_STATE_COOKIE_WAIT: 1425 /* this is the expected state for this chunk */ 1426 /* process the INIT-ACK parameters */ 1427 if (stcb->asoc.primary_destination->dest_state & 1428 SCTP_ADDR_UNCONFIRMED) { 1429 /* 1430 * The primary is where we sent the INIT, we can 1431 * always consider it confirmed when the INIT-ACK is 1432 * returned. Do this before we load addresses 1433 * though. 1434 */ 1435 stcb->asoc.primary_destination->dest_state &= 1436 ~SCTP_ADDR_UNCONFIRMED; 1437 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1438 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1439 } 1440 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1441 net, abort_no_unlock, 1442 mflowtype, mflowid, 1443 vrf_id) < 0) { 1444 /* error in parsing parameters */ 1445 return (-1); 1446 } 1447 /* update our state */ 1448 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1449 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1450 1451 /* reset the RTO calc */ 1452 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1453 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1454 stcb->asoc.overall_error_count, 1455 0, 1456 SCTP_FROM_SCTP_INPUT, 1457 __LINE__); 1458 } 1459 stcb->asoc.overall_error_count = 0; 1460 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1461 /* 1462 * collapse the init timer back in case of a exponential 1463 * backoff 1464 */ 1465 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1466 stcb, net); 1467 /* 1468 * the send at the end of the inbound data processing will 1469 * cause the cookie to be sent 1470 */ 1471 break; 1472 case SCTP_STATE_SHUTDOWN_SENT: 1473 /* incorrect state... discard */ 1474 break; 1475 case SCTP_STATE_COOKIE_ECHOED: 1476 /* incorrect state... discard */ 1477 break; 1478 case SCTP_STATE_OPEN: 1479 /* incorrect state... discard */ 1480 break; 1481 case SCTP_STATE_EMPTY: 1482 case SCTP_STATE_INUSE: 1483 default: 1484 /* incorrect state... discard */ 1485 return (-1); 1486 break; 1487 } 1488 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1489 return (0); 1490 } 1491 1492 static struct sctp_tcb * 1493 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1494 struct sockaddr *src, struct sockaddr *dst, 1495 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1496 struct sctp_inpcb *inp, struct sctp_nets **netp, 1497 struct sockaddr *init_src, int *notification, 1498 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1499 uint8_t mflowtype, uint32_t mflowid, 1500 uint32_t vrf_id, uint16_t port); 1501 1502 1503 /* 1504 * handle a state cookie for an existing association m: input packet mbuf 1505 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1506 * "split" mbuf and the cookie signature does not exist offset: offset into 1507 * mbuf to the cookie-echo chunk 1508 */ 1509 static struct sctp_tcb * 1510 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1511 struct sockaddr *src, struct sockaddr *dst, 1512 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1513 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1514 struct sockaddr *init_src, int *notification, 1515 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1516 uint8_t mflowtype, uint32_t mflowid, 1517 uint32_t vrf_id, uint16_t port) 1518 { 1519 struct sctp_association *asoc; 1520 struct sctp_init_chunk *init_cp, init_buf; 1521 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1522 struct sctp_nets *net; 1523 struct mbuf *op_err; 1524 struct timeval old; 1525 int init_offset, initack_offset, i; 1526 int retval; 1527 int spec_flag = 0; 1528 uint32_t how_indx; 1529 #if defined(SCTP_DETAILED_STR_STATS) 1530 int j; 1531 #endif 1532 1533 net = *netp; 1534 /* I know that the TCB is non-NULL from the caller */ 1535 asoc = &stcb->asoc; 1536 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1537 if (asoc->cookie_how[how_indx] == 0) 1538 break; 1539 } 1540 if (how_indx < sizeof(asoc->cookie_how)) { 1541 asoc->cookie_how[how_indx] = 1; 1542 } 1543 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1544 /* SHUTDOWN came in after sending INIT-ACK */ 1545 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1546 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1547 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1548 mflowtype, mflowid, inp->fibnum, 1549 vrf_id, net->port); 1550 if (how_indx < sizeof(asoc->cookie_how)) 1551 asoc->cookie_how[how_indx] = 2; 1552 return (NULL); 1553 } 1554 /* 1555 * find and validate the INIT chunk in the cookie (peer's info) the 1556 * INIT should start after the cookie-echo header struct (chunk 1557 * header, state cookie header struct) 1558 */ 1559 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1560 1561 init_cp = (struct sctp_init_chunk *) 1562 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1563 (uint8_t *)&init_buf); 1564 if (init_cp == NULL) { 1565 /* could not pull a INIT chunk in cookie */ 1566 return (NULL); 1567 } 1568 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1569 return (NULL); 1570 } 1571 /* 1572 * find and validate the INIT-ACK chunk in the cookie (my info) the 1573 * INIT-ACK follows the INIT chunk 1574 */ 1575 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1576 initack_cp = (struct sctp_init_ack_chunk *) 1577 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1578 (uint8_t *)&initack_buf); 1579 if (initack_cp == NULL) { 1580 /* could not pull INIT-ACK chunk in cookie */ 1581 return (NULL); 1582 } 1583 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1584 return (NULL); 1585 } 1586 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1588 /* 1589 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1590 * to get into the OPEN state 1591 */ 1592 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1593 /*- 1594 * Opps, this means that we somehow generated two vtag's 1595 * the same. I.e. we did: 1596 * Us Peer 1597 * <---INIT(tag=a)------ 1598 * ----INIT-ACK(tag=t)--> 1599 * ----INIT(tag=t)------> *1 1600 * <---INIT-ACK(tag=a)--- 1601 * <----CE(tag=t)------------- *2 1602 * 1603 * At point *1 we should be generating a different 1604 * tag t'. Which means we would throw away the CE and send 1605 * ours instead. Basically this is case C (throw away side). 1606 */ 1607 if (how_indx < sizeof(asoc->cookie_how)) 1608 asoc->cookie_how[how_indx] = 17; 1609 return (NULL); 1610 1611 } 1612 switch (SCTP_GET_STATE(stcb)) { 1613 case SCTP_STATE_COOKIE_WAIT: 1614 case SCTP_STATE_COOKIE_ECHOED: 1615 /* 1616 * INIT was sent but got a COOKIE_ECHO with the 1617 * correct tags... just accept it...but we must 1618 * process the init so that we can make sure we have 1619 * the right seq no's. 1620 */ 1621 /* First we must process the INIT !! */ 1622 retval = sctp_process_init(init_cp, stcb); 1623 if (retval < 0) { 1624 if (how_indx < sizeof(asoc->cookie_how)) 1625 asoc->cookie_how[how_indx] = 3; 1626 return (NULL); 1627 } 1628 /* we have already processed the INIT so no problem */ 1629 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1630 stcb, net, 1631 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1632 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1633 stcb, net, 1634 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1635 /* update current state */ 1636 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1637 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1638 else 1639 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1640 1641 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1642 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1643 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1644 stcb->sctp_ep, stcb, NULL); 1645 } 1646 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1647 sctp_stop_all_cookie_timers(stcb); 1648 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1649 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1650 (!SCTP_IS_LISTENING(inp))) { 1651 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1652 struct socket *so; 1653 #endif 1654 /* 1655 * Here is where collision would go if we 1656 * did a connect() and instead got a 1657 * init/init-ack/cookie done before the 1658 * init-ack came back.. 1659 */ 1660 stcb->sctp_ep->sctp_flags |= 1661 SCTP_PCB_FLAGS_CONNECTED; 1662 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1663 so = SCTP_INP_SO(stcb->sctp_ep); 1664 atomic_add_int(&stcb->asoc.refcnt, 1); 1665 SCTP_TCB_UNLOCK(stcb); 1666 SCTP_SOCKET_LOCK(so, 1); 1667 SCTP_TCB_LOCK(stcb); 1668 atomic_add_int(&stcb->asoc.refcnt, -1); 1669 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1670 SCTP_SOCKET_UNLOCK(so, 1); 1671 return (NULL); 1672 } 1673 #endif 1674 soisconnected(stcb->sctp_socket); 1675 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1676 SCTP_SOCKET_UNLOCK(so, 1); 1677 #endif 1678 } 1679 /* notify upper layer */ 1680 *notification = SCTP_NOTIFY_ASSOC_UP; 1681 /* 1682 * since we did not send a HB make sure we don't 1683 * double things 1684 */ 1685 old.tv_sec = cookie->time_entered.tv_sec; 1686 old.tv_usec = cookie->time_entered.tv_usec; 1687 net->hb_responded = 1; 1688 sctp_calculate_rto(stcb, asoc, net, &old, 1689 SCTP_RTT_FROM_NON_DATA); 1690 1691 if (stcb->asoc.sctp_autoclose_ticks && 1692 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1693 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1694 inp, stcb, NULL); 1695 } 1696 break; 1697 default: 1698 /* 1699 * we're in the OPEN state (or beyond), so peer must 1700 * have simply lost the COOKIE-ACK 1701 */ 1702 break; 1703 } /* end switch */ 1704 sctp_stop_all_cookie_timers(stcb); 1705 /* 1706 * We ignore the return code here.. not sure if we should 1707 * somehow abort.. but we do have an existing asoc. This 1708 * really should not fail. 1709 */ 1710 if (sctp_load_addresses_from_init(stcb, m, 1711 init_offset + sizeof(struct sctp_init_chunk), 1712 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1713 if (how_indx < sizeof(asoc->cookie_how)) 1714 asoc->cookie_how[how_indx] = 4; 1715 return (NULL); 1716 } 1717 /* respond with a COOKIE-ACK */ 1718 sctp_toss_old_cookies(stcb, asoc); 1719 sctp_send_cookie_ack(stcb); 1720 if (how_indx < sizeof(asoc->cookie_how)) 1721 asoc->cookie_how[how_indx] = 5; 1722 return (stcb); 1723 } 1724 1725 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1726 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1727 cookie->tie_tag_my_vtag == 0 && 1728 cookie->tie_tag_peer_vtag == 0) { 1729 /* 1730 * case C in Section 5.2.4 Table 2: XMOO silently discard 1731 */ 1732 if (how_indx < sizeof(asoc->cookie_how)) 1733 asoc->cookie_how[how_indx] = 6; 1734 return (NULL); 1735 } 1736 /* 1737 * If nat support, and the below and stcb is established, send back 1738 * a ABORT(colliding state) if we are established. 1739 */ 1740 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1741 (asoc->peer_supports_nat) && 1742 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1743 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1744 (asoc->peer_vtag == 0)))) { 1745 /* 1746 * Special case - Peer's support nat. We may have two init's 1747 * that we gave out the same tag on since one was not 1748 * established.. i.e. we get INIT from host-1 behind the nat 1749 * and we respond tag-a, we get a INIT from host-2 behind 1750 * the nat and we get tag-a again. Then we bring up host-1 1751 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1752 * Now we have colliding state. We must send an abort here 1753 * with colliding state indication. 1754 */ 1755 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1756 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1757 mflowtype, mflowid, inp->fibnum, 1758 vrf_id, port); 1759 return (NULL); 1760 } 1761 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1762 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1763 (asoc->peer_vtag == 0))) { 1764 /* 1765 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1766 * should be ok, re-accept peer info 1767 */ 1768 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1769 /* 1770 * Extension of case C. If we hit this, then the 1771 * random number generator returned the same vtag 1772 * when we first sent our INIT-ACK and when we later 1773 * sent our INIT. The side with the seq numbers that 1774 * are different will be the one that normnally 1775 * would have hit case C. This in effect "extends" 1776 * our vtags in this collision case to be 64 bits. 1777 * The same collision could occur aka you get both 1778 * vtag and seq number the same twice in a row.. but 1779 * is much less likely. If it did happen then we 1780 * would proceed through and bring up the assoc.. we 1781 * may end up with the wrong stream setup however.. 1782 * which would be bad.. but there is no way to 1783 * tell.. until we send on a stream that does not 1784 * exist :-) 1785 */ 1786 if (how_indx < sizeof(asoc->cookie_how)) 1787 asoc->cookie_how[how_indx] = 7; 1788 1789 return (NULL); 1790 } 1791 if (how_indx < sizeof(asoc->cookie_how)) 1792 asoc->cookie_how[how_indx] = 8; 1793 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1794 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1795 sctp_stop_all_cookie_timers(stcb); 1796 /* 1797 * since we did not send a HB make sure we don't double 1798 * things 1799 */ 1800 net->hb_responded = 1; 1801 if (stcb->asoc.sctp_autoclose_ticks && 1802 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1803 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1804 NULL); 1805 } 1806 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1807 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1808 1809 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1810 /* 1811 * Ok the peer probably discarded our data (if we 1812 * echoed a cookie+data). So anything on the 1813 * sent_queue should be marked for retransmit, we 1814 * may not get something to kick us so it COULD 1815 * still take a timeout to move these.. but it can't 1816 * hurt to mark them. 1817 */ 1818 struct sctp_tmit_chunk *chk; 1819 1820 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1821 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1822 chk->sent = SCTP_DATAGRAM_RESEND; 1823 sctp_flight_size_decrease(chk); 1824 sctp_total_flight_decrease(stcb, chk); 1825 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1826 spec_flag++; 1827 } 1828 } 1829 1830 } 1831 /* process the INIT info (peer's info) */ 1832 retval = sctp_process_init(init_cp, stcb); 1833 if (retval < 0) { 1834 if (how_indx < sizeof(asoc->cookie_how)) 1835 asoc->cookie_how[how_indx] = 9; 1836 return (NULL); 1837 } 1838 if (sctp_load_addresses_from_init(stcb, m, 1839 init_offset + sizeof(struct sctp_init_chunk), 1840 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1841 if (how_indx < sizeof(asoc->cookie_how)) 1842 asoc->cookie_how[how_indx] = 10; 1843 return (NULL); 1844 } 1845 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1846 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1847 *notification = SCTP_NOTIFY_ASSOC_UP; 1848 1849 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1850 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1851 (!SCTP_IS_LISTENING(inp))) { 1852 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1853 struct socket *so; 1854 #endif 1855 stcb->sctp_ep->sctp_flags |= 1856 SCTP_PCB_FLAGS_CONNECTED; 1857 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1858 so = SCTP_INP_SO(stcb->sctp_ep); 1859 atomic_add_int(&stcb->asoc.refcnt, 1); 1860 SCTP_TCB_UNLOCK(stcb); 1861 SCTP_SOCKET_LOCK(so, 1); 1862 SCTP_TCB_LOCK(stcb); 1863 atomic_add_int(&stcb->asoc.refcnt, -1); 1864 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 1865 SCTP_SOCKET_UNLOCK(so, 1); 1866 return (NULL); 1867 } 1868 #endif 1869 soisconnected(stcb->sctp_socket); 1870 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1871 SCTP_SOCKET_UNLOCK(so, 1); 1872 #endif 1873 } 1874 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1875 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1876 else 1877 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1878 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1879 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1880 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1881 } else { 1882 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1883 } 1884 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1885 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1886 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1887 stcb->sctp_ep, stcb, NULL); 1888 } 1889 sctp_stop_all_cookie_timers(stcb); 1890 sctp_toss_old_cookies(stcb, asoc); 1891 sctp_send_cookie_ack(stcb); 1892 if (spec_flag) { 1893 /* 1894 * only if we have retrans set do we do this. What 1895 * this call does is get only the COOKIE-ACK out and 1896 * then when we return the normal call to 1897 * sctp_chunk_output will get the retrans out behind 1898 * this. 1899 */ 1900 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1901 } 1902 if (how_indx < sizeof(asoc->cookie_how)) 1903 asoc->cookie_how[how_indx] = 11; 1904 1905 return (stcb); 1906 } 1907 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1908 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1909 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1910 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1911 cookie->tie_tag_peer_vtag != 0) { 1912 struct sctpasochead *head; 1913 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1914 struct socket *so; 1915 #endif 1916 1917 if (asoc->peer_supports_nat) { 1918 /* 1919 * This is a gross gross hack. Just call the 1920 * cookie_new code since we are allowing a duplicate 1921 * association. I hope this works... 1922 */ 1923 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1924 sh, cookie, cookie_len, 1925 inp, netp, init_src, notification, 1926 auth_skipped, auth_offset, auth_len, 1927 mflowtype, mflowid, 1928 vrf_id, port)); 1929 } 1930 /* 1931 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1932 */ 1933 /* temp code */ 1934 if (how_indx < sizeof(asoc->cookie_how)) 1935 asoc->cookie_how[how_indx] = 12; 1936 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1937 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1938 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1939 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1940 1941 /* notify upper layer */ 1942 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1943 atomic_add_int(&stcb->asoc.refcnt, 1); 1944 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1945 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1946 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1947 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1948 } 1949 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1950 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1951 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1952 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1953 } 1954 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1955 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1956 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1957 stcb->sctp_ep, stcb, NULL); 1958 1959 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1960 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1961 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1962 } 1963 asoc->pre_open_streams = 1964 ntohs(initack_cp->init.num_outbound_streams); 1965 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1966 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1967 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1968 1969 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1970 1971 asoc->str_reset_seq_in = asoc->init_seq_number; 1972 1973 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1974 if (asoc->mapping_array) { 1975 memset(asoc->mapping_array, 0, 1976 asoc->mapping_array_size); 1977 } 1978 if (asoc->nr_mapping_array) { 1979 memset(asoc->nr_mapping_array, 0, 1980 asoc->mapping_array_size); 1981 } 1982 SCTP_TCB_UNLOCK(stcb); 1983 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 1984 so = SCTP_INP_SO(stcb->sctp_ep); 1985 SCTP_SOCKET_LOCK(so, 1); 1986 #endif 1987 SCTP_INP_INFO_WLOCK(); 1988 SCTP_INP_WLOCK(stcb->sctp_ep); 1989 SCTP_TCB_LOCK(stcb); 1990 atomic_add_int(&stcb->asoc.refcnt, -1); 1991 /* send up all the data */ 1992 SCTP_TCB_SEND_LOCK(stcb); 1993 1994 sctp_report_all_outbound(stcb, 0, 1, SCTP_SO_LOCKED); 1995 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1996 stcb->asoc.strmout[i].chunks_on_queues = 0; 1997 #if defined(SCTP_DETAILED_STR_STATS) 1998 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1999 asoc->strmout[i].abandoned_sent[j] = 0; 2000 asoc->strmout[i].abandoned_unsent[j] = 0; 2001 } 2002 #else 2003 asoc->strmout[i].abandoned_sent[0] = 0; 2004 asoc->strmout[i].abandoned_unsent[0] = 0; 2005 #endif 2006 stcb->asoc.strmout[i].sid = i; 2007 stcb->asoc.strmout[i].next_mid_ordered = 0; 2008 stcb->asoc.strmout[i].next_mid_unordered = 0; 2009 stcb->asoc.strmout[i].last_msg_incomplete = 0; 2010 } 2011 /* process the INIT-ACK info (my info) */ 2012 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2013 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2014 2015 /* pull from vtag hash */ 2016 LIST_REMOVE(stcb, sctp_asocs); 2017 /* re-insert to new vtag position */ 2018 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 2019 SCTP_BASE_INFO(hashasocmark))]; 2020 /* 2021 * put it in the bucket in the vtag hash of assoc's for the 2022 * system 2023 */ 2024 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 2025 2026 SCTP_TCB_SEND_UNLOCK(stcb); 2027 SCTP_INP_WUNLOCK(stcb->sctp_ep); 2028 SCTP_INP_INFO_WUNLOCK(); 2029 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2030 SCTP_SOCKET_UNLOCK(so, 1); 2031 #endif 2032 asoc->total_flight = 0; 2033 asoc->total_flight_count = 0; 2034 /* process the INIT info (peer's info) */ 2035 retval = sctp_process_init(init_cp, stcb); 2036 if (retval < 0) { 2037 if (how_indx < sizeof(asoc->cookie_how)) 2038 asoc->cookie_how[how_indx] = 13; 2039 2040 return (NULL); 2041 } 2042 /* 2043 * since we did not send a HB make sure we don't double 2044 * things 2045 */ 2046 net->hb_responded = 1; 2047 2048 if (sctp_load_addresses_from_init(stcb, m, 2049 init_offset + sizeof(struct sctp_init_chunk), 2050 initack_offset, src, dst, init_src, stcb->asoc.port)) { 2051 if (how_indx < sizeof(asoc->cookie_how)) 2052 asoc->cookie_how[how_indx] = 14; 2053 2054 return (NULL); 2055 } 2056 /* respond with a COOKIE-ACK */ 2057 sctp_stop_all_cookie_timers(stcb); 2058 sctp_toss_old_cookies(stcb, asoc); 2059 sctp_send_cookie_ack(stcb); 2060 if (how_indx < sizeof(asoc->cookie_how)) 2061 asoc->cookie_how[how_indx] = 15; 2062 2063 return (stcb); 2064 } 2065 if (how_indx < sizeof(asoc->cookie_how)) 2066 asoc->cookie_how[how_indx] = 16; 2067 /* all other cases... */ 2068 return (NULL); 2069 } 2070 2071 2072 /* 2073 * handle a state cookie for a new association m: input packet mbuf chain-- 2074 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 2075 * and the cookie signature does not exist offset: offset into mbuf to the 2076 * cookie-echo chunk length: length of the cookie chunk to: where the init 2077 * was from returns a new TCB 2078 */ 2079 static struct sctp_tcb * 2080 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 2081 struct sockaddr *src, struct sockaddr *dst, 2082 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 2083 struct sctp_inpcb *inp, struct sctp_nets **netp, 2084 struct sockaddr *init_src, int *notification, 2085 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2086 uint8_t mflowtype, uint32_t mflowid, 2087 uint32_t vrf_id, uint16_t port) 2088 { 2089 struct sctp_tcb *stcb; 2090 struct sctp_init_chunk *init_cp, init_buf; 2091 struct sctp_init_ack_chunk *initack_cp, initack_buf; 2092 union sctp_sockstore store; 2093 struct sctp_association *asoc; 2094 int init_offset, initack_offset, initack_limit; 2095 int retval; 2096 int error = 0; 2097 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 2098 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2099 struct socket *so; 2100 2101 so = SCTP_INP_SO(inp); 2102 #endif 2103 2104 /* 2105 * find and validate the INIT chunk in the cookie (peer's info) the 2106 * INIT should start after the cookie-echo header struct (chunk 2107 * header, state cookie header struct) 2108 */ 2109 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2110 init_cp = (struct sctp_init_chunk *) 2111 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2112 (uint8_t *)&init_buf); 2113 if (init_cp == NULL) { 2114 /* could not pull a INIT chunk in cookie */ 2115 SCTPDBG(SCTP_DEBUG_INPUT1, 2116 "process_cookie_new: could not pull INIT chunk hdr\n"); 2117 return (NULL); 2118 } 2119 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2120 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2121 return (NULL); 2122 } 2123 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2124 /* 2125 * find and validate the INIT-ACK chunk in the cookie (my info) the 2126 * INIT-ACK follows the INIT chunk 2127 */ 2128 initack_cp = (struct sctp_init_ack_chunk *) 2129 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2130 (uint8_t *)&initack_buf); 2131 if (initack_cp == NULL) { 2132 /* could not pull INIT-ACK chunk in cookie */ 2133 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2134 return (NULL); 2135 } 2136 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2137 return (NULL); 2138 } 2139 /* 2140 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2141 * "initack_limit" value. This is because the chk_length field 2142 * includes the length of the cookie, but the cookie is omitted when 2143 * the INIT and INIT_ACK are tacked onto the cookie... 2144 */ 2145 initack_limit = offset + cookie_len; 2146 2147 /* 2148 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2149 * and popluate 2150 */ 2151 2152 /* 2153 * Here we do a trick, we set in NULL for the proc/thread argument. 2154 * We do this since in effect we only use the p argument when the 2155 * socket is unbound and we must do an implicit bind. Since we are 2156 * getting a cookie, we cannot be unbound. 2157 */ 2158 stcb = sctp_aloc_assoc(inp, init_src, &error, 2159 ntohl(initack_cp->init.initiate_tag), vrf_id, 2160 ntohs(initack_cp->init.num_outbound_streams), 2161 port, 2162 (struct thread *)NULL, 2163 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2164 if (stcb == NULL) { 2165 struct mbuf *op_err; 2166 2167 /* memory problem? */ 2168 SCTPDBG(SCTP_DEBUG_INPUT1, 2169 "process_cookie_new: no room for another TCB!\n"); 2170 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2171 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2172 src, dst, sh, op_err, 2173 mflowtype, mflowid, 2174 vrf_id, port); 2175 return (NULL); 2176 } 2177 /* get the correct sctp_nets */ 2178 if (netp) 2179 *netp = sctp_findnet(stcb, init_src); 2180 2181 asoc = &stcb->asoc; 2182 /* get scope variables out of cookie */ 2183 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2184 asoc->scope.site_scope = cookie->site_scope; 2185 asoc->scope.local_scope = cookie->local_scope; 2186 asoc->scope.loopback_scope = cookie->loopback_scope; 2187 2188 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2189 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2190 struct mbuf *op_err; 2191 2192 /* 2193 * Houston we have a problem. The EP changed while the 2194 * cookie was in flight. Only recourse is to abort the 2195 * association. 2196 */ 2197 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2198 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2199 src, dst, sh, op_err, 2200 mflowtype, mflowid, 2201 vrf_id, port); 2202 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2203 atomic_add_int(&stcb->asoc.refcnt, 1); 2204 SCTP_TCB_UNLOCK(stcb); 2205 SCTP_SOCKET_LOCK(so, 1); 2206 SCTP_TCB_LOCK(stcb); 2207 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2208 #endif 2209 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2210 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2211 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2212 SCTP_SOCKET_UNLOCK(so, 1); 2213 #endif 2214 return (NULL); 2215 } 2216 /* process the INIT-ACK info (my info) */ 2217 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2218 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2219 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2220 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2221 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2222 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2223 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2224 asoc->str_reset_seq_in = asoc->init_seq_number; 2225 2226 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2227 2228 /* process the INIT info (peer's info) */ 2229 if (netp) 2230 retval = sctp_process_init(init_cp, stcb); 2231 else 2232 retval = 0; 2233 if (retval < 0) { 2234 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2235 atomic_add_int(&stcb->asoc.refcnt, 1); 2236 SCTP_TCB_UNLOCK(stcb); 2237 SCTP_SOCKET_LOCK(so, 1); 2238 SCTP_TCB_LOCK(stcb); 2239 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2240 #endif 2241 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2242 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2243 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2244 SCTP_SOCKET_UNLOCK(so, 1); 2245 #endif 2246 return (NULL); 2247 } 2248 /* load all addresses */ 2249 if (sctp_load_addresses_from_init(stcb, m, 2250 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2251 src, dst, init_src, port)) { 2252 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2253 atomic_add_int(&stcb->asoc.refcnt, 1); 2254 SCTP_TCB_UNLOCK(stcb); 2255 SCTP_SOCKET_LOCK(so, 1); 2256 SCTP_TCB_LOCK(stcb); 2257 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2258 #endif 2259 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2260 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2261 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2262 SCTP_SOCKET_UNLOCK(so, 1); 2263 #endif 2264 return (NULL); 2265 } 2266 /* 2267 * verify any preceding AUTH chunk that was skipped 2268 */ 2269 /* pull the local authentication parameters from the cookie/init-ack */ 2270 sctp_auth_get_cookie_params(stcb, m, 2271 initack_offset + sizeof(struct sctp_init_ack_chunk), 2272 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2273 if (auth_skipped) { 2274 struct sctp_auth_chunk *auth; 2275 2276 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2277 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2278 } else { 2279 auth = NULL; 2280 } 2281 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2282 /* auth HMAC failed, dump the assoc and packet */ 2283 SCTPDBG(SCTP_DEBUG_AUTH1, 2284 "COOKIE-ECHO: AUTH failed\n"); 2285 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2286 atomic_add_int(&stcb->asoc.refcnt, 1); 2287 SCTP_TCB_UNLOCK(stcb); 2288 SCTP_SOCKET_LOCK(so, 1); 2289 SCTP_TCB_LOCK(stcb); 2290 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2291 #endif 2292 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2293 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2294 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2295 SCTP_SOCKET_UNLOCK(so, 1); 2296 #endif 2297 return (NULL); 2298 } else { 2299 /* remaining chunks checked... good to go */ 2300 stcb->asoc.authenticated = 1; 2301 } 2302 } 2303 2304 /* 2305 * if we're doing ASCONFs, check to see if we have any new local 2306 * addresses that need to get added to the peer (eg. addresses 2307 * changed while cookie echo in flight). This needs to be done 2308 * after we go to the OPEN state to do the correct asconf 2309 * processing. else, make sure we have the correct addresses in our 2310 * lists 2311 */ 2312 2313 /* warning, we re-use sin, sin6, sa_store here! */ 2314 /* pull in local_address (our "from" address) */ 2315 switch (cookie->laddr_type) { 2316 #ifdef INET 2317 case SCTP_IPV4_ADDRESS: 2318 /* source addr is IPv4 */ 2319 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2320 store.sin.sin_family = AF_INET; 2321 store.sin.sin_len = sizeof(struct sockaddr_in); 2322 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2323 break; 2324 #endif 2325 #ifdef INET6 2326 case SCTP_IPV6_ADDRESS: 2327 /* source addr is IPv6 */ 2328 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2329 store.sin6.sin6_family = AF_INET6; 2330 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2331 store.sin6.sin6_scope_id = cookie->scope_id; 2332 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2333 break; 2334 #endif 2335 default: 2336 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2337 atomic_add_int(&stcb->asoc.refcnt, 1); 2338 SCTP_TCB_UNLOCK(stcb); 2339 SCTP_SOCKET_LOCK(so, 1); 2340 SCTP_TCB_LOCK(stcb); 2341 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2342 #endif 2343 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2344 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2345 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2346 SCTP_SOCKET_UNLOCK(so, 1); 2347 #endif 2348 return (NULL); 2349 } 2350 2351 /* update current state */ 2352 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2353 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2354 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2355 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2356 stcb->sctp_ep, stcb, NULL); 2357 } 2358 sctp_stop_all_cookie_timers(stcb); 2359 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2360 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2361 2362 /* set up to notify upper layer */ 2363 *notification = SCTP_NOTIFY_ASSOC_UP; 2364 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2365 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2366 (!SCTP_IS_LISTENING(inp))) { 2367 /* 2368 * This is an endpoint that called connect() how it got a 2369 * cookie that is NEW is a bit of a mystery. It must be that 2370 * the INIT was sent, but before it got there.. a complete 2371 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2372 * should have went to the other code.. not here.. oh well.. 2373 * a bit of protection is worth having.. 2374 */ 2375 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2376 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2377 atomic_add_int(&stcb->asoc.refcnt, 1); 2378 SCTP_TCB_UNLOCK(stcb); 2379 SCTP_SOCKET_LOCK(so, 1); 2380 SCTP_TCB_LOCK(stcb); 2381 atomic_subtract_int(&stcb->asoc.refcnt, 1); 2382 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2383 SCTP_SOCKET_UNLOCK(so, 1); 2384 return (NULL); 2385 } 2386 #endif 2387 soisconnected(stcb->sctp_socket); 2388 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2389 SCTP_SOCKET_UNLOCK(so, 1); 2390 #endif 2391 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2392 (SCTP_IS_LISTENING(inp))) { 2393 /* 2394 * We don't want to do anything with this one. Since it is 2395 * the listening guy. The timer will get started for 2396 * accepted connections in the caller. 2397 */ 2398 ; 2399 } 2400 /* since we did not send a HB make sure we don't double things */ 2401 if ((netp) && (*netp)) 2402 (*netp)->hb_responded = 1; 2403 2404 if (stcb->asoc.sctp_autoclose_ticks && 2405 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2406 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2407 } 2408 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2409 if ((netp != NULL) && (*netp != NULL)) { 2410 struct timeval old; 2411 2412 /* calculate the RTT and set the encaps port */ 2413 old.tv_sec = cookie->time_entered.tv_sec; 2414 old.tv_usec = cookie->time_entered.tv_usec; 2415 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2416 } 2417 /* respond with a COOKIE-ACK */ 2418 sctp_send_cookie_ack(stcb); 2419 2420 /* 2421 * check the address lists for any ASCONFs that need to be sent 2422 * AFTER the cookie-ack is sent 2423 */ 2424 sctp_check_address_list(stcb, m, 2425 initack_offset + sizeof(struct sctp_init_ack_chunk), 2426 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2427 &store.sa, cookie->local_scope, cookie->site_scope, 2428 cookie->ipv4_scope, cookie->loopback_scope); 2429 2430 2431 return (stcb); 2432 } 2433 2434 /* 2435 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2436 * we NEED to make sure we are not already using the vtag. If so we 2437 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2438 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2439 SCTP_BASE_INFO(hashasocmark))]; 2440 LIST_FOREACH(stcb, head, sctp_asocs) { 2441 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2442 -- SEND ABORT - TRY AGAIN -- 2443 } 2444 } 2445 */ 2446 2447 /* 2448 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2449 * existing (non-NULL) TCB 2450 */ 2451 static struct mbuf * 2452 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2453 struct sockaddr *src, struct sockaddr *dst, 2454 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2455 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2456 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2457 struct sctp_tcb **locked_tcb, 2458 uint8_t mflowtype, uint32_t mflowid, 2459 uint32_t vrf_id, uint16_t port) 2460 { 2461 struct sctp_state_cookie *cookie; 2462 struct sctp_tcb *l_stcb = *stcb; 2463 struct sctp_inpcb *l_inp; 2464 struct sockaddr *to; 2465 struct sctp_pcb *ep; 2466 struct mbuf *m_sig; 2467 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2468 uint8_t *sig; 2469 uint8_t cookie_ok = 0; 2470 unsigned int sig_offset, cookie_offset; 2471 unsigned int cookie_len; 2472 struct timeval now; 2473 struct timeval time_expires; 2474 int notification = 0; 2475 struct sctp_nets *netl; 2476 int had_a_existing_tcb = 0; 2477 int send_int_conf = 0; 2478 #ifdef INET 2479 struct sockaddr_in sin; 2480 #endif 2481 #ifdef INET6 2482 struct sockaddr_in6 sin6; 2483 #endif 2484 2485 SCTPDBG(SCTP_DEBUG_INPUT2, 2486 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2487 2488 if (inp_p == NULL) { 2489 return (NULL); 2490 } 2491 cookie = &cp->cookie; 2492 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2493 cookie_len = ntohs(cp->ch.chunk_length); 2494 2495 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2496 sizeof(struct sctp_init_chunk) + 2497 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2498 /* cookie too small */ 2499 return (NULL); 2500 } 2501 if ((cookie->peerport != sh->src_port) || 2502 (cookie->myport != sh->dest_port) || 2503 (cookie->my_vtag != sh->v_tag)) { 2504 /* 2505 * invalid ports or bad tag. Note that we always leave the 2506 * v_tag in the header in network order and when we stored 2507 * it in the my_vtag slot we also left it in network order. 2508 * This maintains the match even though it may be in the 2509 * opposite byte order of the machine :-> 2510 */ 2511 return (NULL); 2512 } 2513 /* 2514 * split off the signature into its own mbuf (since it should not be 2515 * calculated in the sctp_hmac_m() call). 2516 */ 2517 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2518 m_sig = m_split(m, sig_offset, M_NOWAIT); 2519 if (m_sig == NULL) { 2520 /* out of memory or ?? */ 2521 return (NULL); 2522 } 2523 #ifdef SCTP_MBUF_LOGGING 2524 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2525 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2526 } 2527 #endif 2528 2529 /* 2530 * compute the signature/digest for the cookie 2531 */ 2532 ep = &(*inp_p)->sctp_ep; 2533 l_inp = *inp_p; 2534 if (l_stcb) { 2535 SCTP_TCB_UNLOCK(l_stcb); 2536 } 2537 SCTP_INP_RLOCK(l_inp); 2538 if (l_stcb) { 2539 SCTP_TCB_LOCK(l_stcb); 2540 } 2541 /* which cookie is it? */ 2542 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2543 (ep->current_secret_number != ep->last_secret_number)) { 2544 /* it's the old cookie */ 2545 (void)sctp_hmac_m(SCTP_HMAC, 2546 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2547 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2548 } else { 2549 /* it's the current cookie */ 2550 (void)sctp_hmac_m(SCTP_HMAC, 2551 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2552 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2553 } 2554 /* get the signature */ 2555 SCTP_INP_RUNLOCK(l_inp); 2556 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2557 if (sig == NULL) { 2558 /* couldn't find signature */ 2559 sctp_m_freem(m_sig); 2560 return (NULL); 2561 } 2562 /* compare the received digest with the computed digest */ 2563 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2564 /* try the old cookie? */ 2565 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2566 (ep->current_secret_number != ep->last_secret_number)) { 2567 /* compute digest with old */ 2568 (void)sctp_hmac_m(SCTP_HMAC, 2569 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2570 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2571 /* compare */ 2572 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2573 cookie_ok = 1; 2574 } 2575 } else { 2576 cookie_ok = 1; 2577 } 2578 2579 /* 2580 * Now before we continue we must reconstruct our mbuf so that 2581 * normal processing of any other chunks will work. 2582 */ 2583 { 2584 struct mbuf *m_at; 2585 2586 m_at = m; 2587 while (SCTP_BUF_NEXT(m_at) != NULL) { 2588 m_at = SCTP_BUF_NEXT(m_at); 2589 } 2590 SCTP_BUF_NEXT(m_at) = m_sig; 2591 } 2592 2593 if (cookie_ok == 0) { 2594 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2595 SCTPDBG(SCTP_DEBUG_INPUT2, 2596 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2597 (uint32_t)offset, cookie_offset, sig_offset); 2598 return (NULL); 2599 } 2600 2601 /* 2602 * check the cookie timestamps to be sure it's not stale 2603 */ 2604 (void)SCTP_GETTIME_TIMEVAL(&now); 2605 /* Expire time is in Ticks, so we convert to seconds */ 2606 time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2607 time_expires.tv_usec = cookie->time_entered.tv_usec; 2608 if (timevalcmp(&now, &time_expires, >)) { 2609 /* cookie is stale! */ 2610 struct mbuf *op_err; 2611 struct sctp_error_stale_cookie *cause; 2612 struct timeval diff; 2613 uint32_t staleness; 2614 2615 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2616 0, M_NOWAIT, 1, MT_DATA); 2617 if (op_err == NULL) { 2618 /* FOOBAR */ 2619 return (NULL); 2620 } 2621 /* Set the len */ 2622 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2623 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2624 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2625 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2626 (sizeof(uint32_t)))); 2627 diff = now; 2628 timevalsub(&diff, &time_expires); 2629 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2630 staleness = UINT32_MAX; 2631 } else { 2632 staleness = diff.tv_sec * 1000000; 2633 } 2634 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2635 staleness += diff.tv_usec; 2636 } else { 2637 staleness = UINT32_MAX; 2638 } 2639 cause->stale_time = htonl(staleness); 2640 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2641 mflowtype, mflowid, l_inp->fibnum, 2642 vrf_id, port); 2643 return (NULL); 2644 } 2645 /* 2646 * Now we must see with the lookup address if we have an existing 2647 * asoc. This will only happen if we were in the COOKIE-WAIT state 2648 * and a INIT collided with us and somewhere the peer sent the 2649 * cookie on another address besides the single address our assoc 2650 * had for him. In this case we will have one of the tie-tags set at 2651 * least AND the address field in the cookie can be used to look it 2652 * up. 2653 */ 2654 to = NULL; 2655 switch (cookie->addr_type) { 2656 #ifdef INET6 2657 case SCTP_IPV6_ADDRESS: 2658 memset(&sin6, 0, sizeof(sin6)); 2659 sin6.sin6_family = AF_INET6; 2660 sin6.sin6_len = sizeof(sin6); 2661 sin6.sin6_port = sh->src_port; 2662 sin6.sin6_scope_id = cookie->scope_id; 2663 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2664 sizeof(sin6.sin6_addr.s6_addr)); 2665 to = (struct sockaddr *)&sin6; 2666 break; 2667 #endif 2668 #ifdef INET 2669 case SCTP_IPV4_ADDRESS: 2670 memset(&sin, 0, sizeof(sin)); 2671 sin.sin_family = AF_INET; 2672 sin.sin_len = sizeof(sin); 2673 sin.sin_port = sh->src_port; 2674 sin.sin_addr.s_addr = cookie->address[0]; 2675 to = (struct sockaddr *)&sin; 2676 break; 2677 #endif 2678 default: 2679 /* This should not happen */ 2680 return (NULL); 2681 } 2682 if (*stcb == NULL) { 2683 /* Yep, lets check */ 2684 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2685 if (*stcb == NULL) { 2686 /* 2687 * We should have only got back the same inp. If we 2688 * got back a different ep we have a problem. The 2689 * original findep got back l_inp and now 2690 */ 2691 if (l_inp != *inp_p) { 2692 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2693 } 2694 } else { 2695 if (*locked_tcb == NULL) { 2696 /* 2697 * In this case we found the assoc only 2698 * after we locked the create lock. This 2699 * means we are in a colliding case and we 2700 * must make sure that we unlock the tcb if 2701 * its one of the cases where we throw away 2702 * the incoming packets. 2703 */ 2704 *locked_tcb = *stcb; 2705 2706 /* 2707 * We must also increment the inp ref count 2708 * since the ref_count flags was set when we 2709 * did not find the TCB, now we found it 2710 * which reduces the refcount.. we must 2711 * raise it back out to balance it all :-) 2712 */ 2713 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2714 if ((*stcb)->sctp_ep != l_inp) { 2715 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2716 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2717 } 2718 } 2719 } 2720 } 2721 2722 cookie_len -= SCTP_SIGNATURE_SIZE; 2723 if (*stcb == NULL) { 2724 /* this is the "normal" case... get a new TCB */ 2725 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2726 cookie, cookie_len, *inp_p, 2727 netp, to, ¬ification, 2728 auth_skipped, auth_offset, auth_len, 2729 mflowtype, mflowid, 2730 vrf_id, port); 2731 } else { 2732 /* this is abnormal... cookie-echo on existing TCB */ 2733 had_a_existing_tcb = 1; 2734 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2735 src, dst, sh, 2736 cookie, cookie_len, *inp_p, *stcb, netp, to, 2737 ¬ification, auth_skipped, auth_offset, auth_len, 2738 mflowtype, mflowid, 2739 vrf_id, port); 2740 } 2741 2742 if (*stcb == NULL) { 2743 /* still no TCB... must be bad cookie-echo */ 2744 return (NULL); 2745 } 2746 if (*netp != NULL) { 2747 (*netp)->flowtype = mflowtype; 2748 (*netp)->flowid = mflowid; 2749 } 2750 /* 2751 * Ok, we built an association so confirm the address we sent the 2752 * INIT-ACK to. 2753 */ 2754 netl = sctp_findnet(*stcb, to); 2755 /* 2756 * This code should in theory NOT run but 2757 */ 2758 if (netl == NULL) { 2759 /* TSNH! Huh, why do I need to add this address here? */ 2760 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2761 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2762 return (NULL); 2763 } 2764 netl = sctp_findnet(*stcb, to); 2765 } 2766 if (netl) { 2767 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2768 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2769 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2770 netl); 2771 send_int_conf = 1; 2772 } 2773 } 2774 sctp_start_net_timers(*stcb); 2775 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2776 if (!had_a_existing_tcb || 2777 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2778 /* 2779 * If we have a NEW cookie or the connect never 2780 * reached the connected state during collision we 2781 * must do the TCP accept thing. 2782 */ 2783 struct socket *so, *oso; 2784 struct sctp_inpcb *inp; 2785 2786 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2787 /* 2788 * For a restart we will keep the same 2789 * socket, no need to do anything. I THINK!! 2790 */ 2791 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2792 if (send_int_conf) { 2793 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2794 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2795 } 2796 return (m); 2797 } 2798 oso = (*inp_p)->sctp_socket; 2799 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2800 SCTP_TCB_UNLOCK((*stcb)); 2801 CURVNET_SET(oso->so_vnet); 2802 so = sonewconn(oso, 0 2803 ); 2804 CURVNET_RESTORE(); 2805 SCTP_TCB_LOCK((*stcb)); 2806 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2807 2808 if (so == NULL) { 2809 struct mbuf *op_err; 2810 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2811 struct socket *pcb_so; 2812 #endif 2813 /* Too many sockets */ 2814 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2815 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2816 sctp_abort_association(*inp_p, NULL, m, iphlen, 2817 src, dst, sh, op_err, 2818 mflowtype, mflowid, 2819 vrf_id, port); 2820 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2821 pcb_so = SCTP_INP_SO(*inp_p); 2822 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2823 SCTP_TCB_UNLOCK((*stcb)); 2824 SCTP_SOCKET_LOCK(pcb_so, 1); 2825 SCTP_TCB_LOCK((*stcb)); 2826 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2827 #endif 2828 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2829 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2830 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2831 SCTP_SOCKET_UNLOCK(pcb_so, 1); 2832 #endif 2833 return (NULL); 2834 } 2835 inp = (struct sctp_inpcb *)so->so_pcb; 2836 SCTP_INP_INCR_REF(inp); 2837 /* 2838 * We add the unbound flag here so that if we get an 2839 * soabort() before we get the move_pcb done, we 2840 * will properly cleanup. 2841 */ 2842 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2843 SCTP_PCB_FLAGS_CONNECTED | 2844 SCTP_PCB_FLAGS_IN_TCPPOOL | 2845 SCTP_PCB_FLAGS_UNBOUND | 2846 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2847 SCTP_PCB_FLAGS_DONT_WAKE); 2848 inp->sctp_features = (*inp_p)->sctp_features; 2849 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2850 inp->sctp_socket = so; 2851 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2852 inp->max_cwnd = (*inp_p)->max_cwnd; 2853 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2854 inp->ecn_supported = (*inp_p)->ecn_supported; 2855 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2856 inp->auth_supported = (*inp_p)->auth_supported; 2857 inp->asconf_supported = (*inp_p)->asconf_supported; 2858 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2859 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2860 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2861 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2862 inp->sctp_context = (*inp_p)->sctp_context; 2863 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2864 inp->fibnum = (*inp_p)->fibnum; 2865 inp->inp_starting_point_for_iterator = NULL; 2866 /* 2867 * copy in the authentication parameters from the 2868 * original endpoint 2869 */ 2870 if (inp->sctp_ep.local_hmacs) 2871 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2872 inp->sctp_ep.local_hmacs = 2873 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2874 if (inp->sctp_ep.local_auth_chunks) 2875 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2876 inp->sctp_ep.local_auth_chunks = 2877 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2878 2879 /* 2880 * Now we must move it from one hash table to 2881 * another and get the tcb in the right place. 2882 */ 2883 2884 /* 2885 * This is where the one-2-one socket is put into 2886 * the accept state waiting for the accept! 2887 */ 2888 if (*stcb) { 2889 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2890 } 2891 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2892 2893 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2894 SCTP_TCB_UNLOCK((*stcb)); 2895 2896 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2897 0); 2898 SCTP_TCB_LOCK((*stcb)); 2899 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2900 2901 2902 /* 2903 * now we must check to see if we were aborted while 2904 * the move was going on and the lock/unlock 2905 * happened. 2906 */ 2907 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2908 /* 2909 * yep it was, we leave the assoc attached 2910 * to the socket since the sctp_inpcb_free() 2911 * call will send an abort for us. 2912 */ 2913 SCTP_INP_DECR_REF(inp); 2914 return (NULL); 2915 } 2916 SCTP_INP_DECR_REF(inp); 2917 /* Switch over to the new guy */ 2918 *inp_p = inp; 2919 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2920 if (send_int_conf) { 2921 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2922 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2923 } 2924 2925 /* 2926 * Pull it from the incomplete queue and wake the 2927 * guy 2928 */ 2929 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2930 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2931 SCTP_TCB_UNLOCK((*stcb)); 2932 SCTP_SOCKET_LOCK(so, 1); 2933 #endif 2934 soisconnected(so); 2935 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 2936 SCTP_TCB_LOCK((*stcb)); 2937 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2938 SCTP_SOCKET_UNLOCK(so, 1); 2939 #endif 2940 return (m); 2941 } 2942 } 2943 if (notification) { 2944 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2945 } 2946 if (send_int_conf) { 2947 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2948 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2949 } 2950 return (m); 2951 } 2952 2953 static void 2954 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2955 struct sctp_tcb *stcb, struct sctp_nets *net) 2956 { 2957 /* cp must not be used, others call this without a c-ack :-) */ 2958 struct sctp_association *asoc; 2959 struct sctp_tmit_chunk *chk; 2960 2961 SCTPDBG(SCTP_DEBUG_INPUT2, 2962 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2963 if ((stcb == NULL) || (net == NULL)) { 2964 return; 2965 } 2966 2967 asoc = &stcb->asoc; 2968 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2969 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2970 asoc->overall_error_count, 2971 0, 2972 SCTP_FROM_SCTP_INPUT, 2973 __LINE__); 2974 } 2975 asoc->overall_error_count = 0; 2976 sctp_stop_all_cookie_timers(stcb); 2977 /* process according to association state */ 2978 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2979 /* state change only needed when I am in right state */ 2980 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2981 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2982 sctp_start_net_timers(stcb); 2983 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2984 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2985 stcb->sctp_ep, stcb, NULL); 2986 2987 } 2988 /* update RTO */ 2989 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2990 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2991 if (asoc->overall_error_count == 0) { 2992 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2993 SCTP_RTT_FROM_NON_DATA); 2994 } 2995 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2996 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2997 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2998 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2999 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3000 struct socket *so; 3001 3002 #endif 3003 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 3004 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3005 so = SCTP_INP_SO(stcb->sctp_ep); 3006 atomic_add_int(&stcb->asoc.refcnt, 1); 3007 SCTP_TCB_UNLOCK(stcb); 3008 SCTP_SOCKET_LOCK(so, 1); 3009 SCTP_TCB_LOCK(stcb); 3010 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3011 #endif 3012 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 3013 soisconnected(stcb->sctp_socket); 3014 } 3015 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3016 SCTP_SOCKET_UNLOCK(so, 1); 3017 #endif 3018 } 3019 /* 3020 * since we did not send a HB make sure we don't double 3021 * things 3022 */ 3023 net->hb_responded = 1; 3024 3025 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 3026 /* 3027 * We don't need to do the asconf thing, nor hb or 3028 * autoclose if the socket is closed. 3029 */ 3030 goto closed_socket; 3031 } 3032 3033 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 3034 stcb, net); 3035 3036 3037 if (stcb->asoc.sctp_autoclose_ticks && 3038 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 3039 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 3040 stcb->sctp_ep, stcb, NULL); 3041 } 3042 /* 3043 * send ASCONF if parameters are pending and ASCONFs are 3044 * allowed (eg. addresses changed when init/cookie echo were 3045 * in flight) 3046 */ 3047 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 3048 (stcb->asoc.asconf_supported == 1) && 3049 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 3050 #ifdef SCTP_TIMER_BASED_ASCONF 3051 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 3052 stcb->sctp_ep, stcb, 3053 stcb->asoc.primary_destination); 3054 #else 3055 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 3056 SCTP_ADDR_NOT_LOCKED); 3057 #endif 3058 } 3059 } 3060 closed_socket: 3061 /* Toss the cookie if I can */ 3062 sctp_toss_old_cookies(stcb, asoc); 3063 /* Restart the timer if we have pending data */ 3064 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 3065 if (chk->whoTo != NULL) { 3066 break; 3067 } 3068 } 3069 if (chk != NULL) { 3070 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 3071 } 3072 } 3073 3074 static void 3075 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 3076 struct sctp_tcb *stcb) 3077 { 3078 struct sctp_nets *net; 3079 struct sctp_tmit_chunk *lchk; 3080 struct sctp_ecne_chunk bkup; 3081 uint8_t override_bit; 3082 uint32_t tsn, window_data_tsn; 3083 int len; 3084 unsigned int pkt_cnt; 3085 3086 len = ntohs(cp->ch.chunk_length); 3087 if ((len != sizeof(struct sctp_ecne_chunk)) && 3088 (len != sizeof(struct old_sctp_ecne_chunk))) { 3089 return; 3090 } 3091 if (len == sizeof(struct old_sctp_ecne_chunk)) { 3092 /* Its the old format */ 3093 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 3094 bkup.num_pkts_since_cwr = htonl(1); 3095 cp = &bkup; 3096 } 3097 SCTP_STAT_INCR(sctps_recvecne); 3098 tsn = ntohl(cp->tsn); 3099 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 3100 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 3101 if (lchk == NULL) { 3102 window_data_tsn = stcb->asoc.sending_seq - 1; 3103 } else { 3104 window_data_tsn = lchk->rec.data.tsn; 3105 } 3106 3107 /* Find where it was sent to if possible. */ 3108 net = NULL; 3109 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 3110 if (lchk->rec.data.tsn == tsn) { 3111 net = lchk->whoTo; 3112 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 3113 break; 3114 } 3115 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 3116 break; 3117 } 3118 } 3119 if (net == NULL) { 3120 /* 3121 * What to do. A previous send of a CWR was possibly lost. 3122 * See how old it is, we may have it marked on the actual 3123 * net. 3124 */ 3125 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 3126 if (tsn == net->last_cwr_tsn) { 3127 /* Found him, send it off */ 3128 break; 3129 } 3130 } 3131 if (net == NULL) { 3132 /* 3133 * If we reach here, we need to send a special CWR 3134 * that says hey, we did this a long time ago and 3135 * you lost the response. 3136 */ 3137 net = TAILQ_FIRST(&stcb->asoc.nets); 3138 if (net == NULL) { 3139 /* TSNH */ 3140 return; 3141 } 3142 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 3143 } else { 3144 override_bit = 0; 3145 } 3146 } else { 3147 override_bit = 0; 3148 } 3149 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 3150 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3151 /* 3152 * JRS - Use the congestion control given in the pluggable 3153 * CC module 3154 */ 3155 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 3156 /* 3157 * We reduce once every RTT. So we will only lower cwnd at 3158 * the next sending seq i.e. the window_data_tsn 3159 */ 3160 net->cwr_window_tsn = window_data_tsn; 3161 net->ecn_ce_pkt_cnt += pkt_cnt; 3162 net->lost_cnt = pkt_cnt; 3163 net->last_cwr_tsn = tsn; 3164 } else { 3165 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 3166 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 3167 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 3168 /* 3169 * Another loss in the same window update how many 3170 * marks/packets lost we have had. 3171 */ 3172 int cnt = 1; 3173 3174 if (pkt_cnt > net->lost_cnt) { 3175 /* Should be the case */ 3176 cnt = (pkt_cnt - net->lost_cnt); 3177 net->ecn_ce_pkt_cnt += cnt; 3178 } 3179 net->lost_cnt = pkt_cnt; 3180 net->last_cwr_tsn = tsn; 3181 /* 3182 * Most CC functions will ignore this call, since we 3183 * are in-window yet of the initial CE the peer saw. 3184 */ 3185 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 3186 } 3187 } 3188 /* 3189 * We always send a CWR this way if our previous one was lost our 3190 * peer will get an update, or if it is not time again to reduce we 3191 * still get the cwr to the peer. Note we set the override when we 3192 * could not find the TSN on the chunk or the destination network. 3193 */ 3194 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 3195 } 3196 3197 static void 3198 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 3199 { 3200 /* 3201 * Here we get a CWR from the peer. We must look in the outqueue and 3202 * make sure that we have a covered ECNE in the control chunk part. 3203 * If so remove it. 3204 */ 3205 struct sctp_tmit_chunk *chk, *nchk; 3206 struct sctp_ecne_chunk *ecne; 3207 int override; 3208 uint32_t cwr_tsn; 3209 3210 cwr_tsn = ntohl(cp->tsn); 3211 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3212 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3213 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3214 continue; 3215 } 3216 if ((override == 0) && (chk->whoTo != net)) { 3217 /* Must be from the right src unless override is set */ 3218 continue; 3219 } 3220 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3221 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3222 /* this covers this ECNE, we can remove it */ 3223 stcb->asoc.ecn_echo_cnt_onq--; 3224 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3225 sctp_next); 3226 stcb->asoc.ctrl_queue_cnt--; 3227 sctp_m_freem(chk->data); 3228 chk->data = NULL; 3229 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3230 if (override == 0) { 3231 break; 3232 } 3233 } 3234 } 3235 } 3236 3237 static void 3238 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3239 struct sctp_tcb *stcb, struct sctp_nets *net) 3240 { 3241 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3242 struct socket *so; 3243 #endif 3244 3245 SCTPDBG(SCTP_DEBUG_INPUT2, 3246 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3247 if (stcb == NULL) 3248 return; 3249 3250 /* process according to association state */ 3251 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3252 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3253 SCTPDBG(SCTP_DEBUG_INPUT2, 3254 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3255 SCTP_TCB_UNLOCK(stcb); 3256 return; 3257 } 3258 /* notify upper layer protocol */ 3259 if (stcb->sctp_socket) { 3260 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3261 } 3262 #ifdef INVARIANTS 3263 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3264 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3265 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3266 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3267 } 3268 #endif 3269 /* stop the timer */ 3270 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3271 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3272 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3273 /* free the TCB */ 3274 SCTPDBG(SCTP_DEBUG_INPUT2, 3275 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3276 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3277 so = SCTP_INP_SO(stcb->sctp_ep); 3278 atomic_add_int(&stcb->asoc.refcnt, 1); 3279 SCTP_TCB_UNLOCK(stcb); 3280 SCTP_SOCKET_LOCK(so, 1); 3281 SCTP_TCB_LOCK(stcb); 3282 atomic_subtract_int(&stcb->asoc.refcnt, 1); 3283 #endif 3284 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3285 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3286 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 3287 SCTP_SOCKET_UNLOCK(so, 1); 3288 #endif 3289 return; 3290 } 3291 3292 static int 3293 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3294 struct sctp_nets *net, uint8_t flg) 3295 { 3296 switch (desc->chunk_type) { 3297 case SCTP_DATA: 3298 /* find the tsn to resend (possibly */ 3299 { 3300 uint32_t tsn; 3301 struct sctp_tmit_chunk *tp1; 3302 3303 tsn = ntohl(desc->tsn_ifany); 3304 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3305 if (tp1->rec.data.tsn == tsn) { 3306 /* found it */ 3307 break; 3308 } 3309 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3310 /* not found */ 3311 tp1 = NULL; 3312 break; 3313 } 3314 } 3315 if (tp1 == NULL) { 3316 /* 3317 * Do it the other way , aka without paying 3318 * attention to queue seq order. 3319 */ 3320 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3321 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3322 if (tp1->rec.data.tsn == tsn) { 3323 /* found it */ 3324 break; 3325 } 3326 } 3327 } 3328 if (tp1 == NULL) { 3329 SCTP_STAT_INCR(sctps_pdrptsnnf); 3330 } 3331 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3332 uint8_t *ddp; 3333 3334 if (((flg & SCTP_BADCRC) == 0) && 3335 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3336 return (0); 3337 } 3338 if ((stcb->asoc.peers_rwnd == 0) && 3339 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3340 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3341 return (0); 3342 } 3343 if (stcb->asoc.peers_rwnd == 0 && 3344 (flg & SCTP_FROM_MIDDLE_BOX)) { 3345 SCTP_STAT_INCR(sctps_pdrpdizrw); 3346 return (0); 3347 } 3348 ddp = (uint8_t *)(mtod(tp1->data, caddr_t)+ 3349 sizeof(struct sctp_data_chunk)); 3350 { 3351 unsigned int iii; 3352 3353 for (iii = 0; iii < sizeof(desc->data_bytes); 3354 iii++) { 3355 if (ddp[iii] != desc->data_bytes[iii]) { 3356 SCTP_STAT_INCR(sctps_pdrpbadd); 3357 return (-1); 3358 } 3359 } 3360 } 3361 3362 if (tp1->do_rtt) { 3363 /* 3364 * this guy had a RTO calculation 3365 * pending on it, cancel it 3366 */ 3367 if (tp1->whoTo->rto_needed == 0) { 3368 tp1->whoTo->rto_needed = 1; 3369 } 3370 tp1->do_rtt = 0; 3371 } 3372 SCTP_STAT_INCR(sctps_pdrpmark); 3373 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3374 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3375 /* 3376 * mark it as if we were doing a FR, since 3377 * we will be getting gap ack reports behind 3378 * the info from the router. 3379 */ 3380 tp1->rec.data.doing_fast_retransmit = 1; 3381 /* 3382 * mark the tsn with what sequences can 3383 * cause a new FR. 3384 */ 3385 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3386 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3387 } else { 3388 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3389 } 3390 3391 /* restart the timer */ 3392 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3393 stcb, tp1->whoTo, 3394 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3395 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3396 stcb, tp1->whoTo); 3397 3398 /* fix counts and things */ 3399 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3400 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3401 tp1->whoTo->flight_size, 3402 tp1->book_size, 3403 (uint32_t)(uintptr_t)stcb, 3404 tp1->rec.data.tsn); 3405 } 3406 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3407 sctp_flight_size_decrease(tp1); 3408 sctp_total_flight_decrease(stcb, tp1); 3409 } 3410 tp1->sent = SCTP_DATAGRAM_RESEND; 3411 } { 3412 /* audit code */ 3413 unsigned int audit; 3414 3415 audit = 0; 3416 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3417 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3418 audit++; 3419 } 3420 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3421 sctp_next) { 3422 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3423 audit++; 3424 } 3425 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3426 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3427 audit, stcb->asoc.sent_queue_retran_cnt); 3428 #ifndef SCTP_AUDITING_ENABLED 3429 stcb->asoc.sent_queue_retran_cnt = audit; 3430 #endif 3431 } 3432 } 3433 } 3434 break; 3435 case SCTP_ASCONF: 3436 { 3437 struct sctp_tmit_chunk *asconf; 3438 3439 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3440 sctp_next) { 3441 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3442 break; 3443 } 3444 } 3445 if (asconf) { 3446 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3447 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3448 asconf->sent = SCTP_DATAGRAM_RESEND; 3449 asconf->snd_count--; 3450 } 3451 } 3452 break; 3453 case SCTP_INITIATION: 3454 /* resend the INIT */ 3455 stcb->asoc.dropped_special_cnt++; 3456 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3457 /* 3458 * If we can get it in, in a few attempts we do 3459 * this, otherwise we let the timer fire. 3460 */ 3461 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3462 stcb, net, 3463 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3464 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3465 } 3466 break; 3467 case SCTP_SELECTIVE_ACK: 3468 case SCTP_NR_SELECTIVE_ACK: 3469 /* resend the sack */ 3470 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3471 break; 3472 case SCTP_HEARTBEAT_REQUEST: 3473 /* resend a demand HB */ 3474 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3475 /* 3476 * Only retransmit if we KNOW we wont destroy the 3477 * tcb 3478 */ 3479 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3480 } 3481 break; 3482 case SCTP_SHUTDOWN: 3483 sctp_send_shutdown(stcb, net); 3484 break; 3485 case SCTP_SHUTDOWN_ACK: 3486 sctp_send_shutdown_ack(stcb, net); 3487 break; 3488 case SCTP_COOKIE_ECHO: 3489 { 3490 struct sctp_tmit_chunk *cookie; 3491 3492 cookie = NULL; 3493 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3494 sctp_next) { 3495 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3496 break; 3497 } 3498 } 3499 if (cookie) { 3500 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3501 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3502 cookie->sent = SCTP_DATAGRAM_RESEND; 3503 sctp_stop_all_cookie_timers(stcb); 3504 } 3505 } 3506 break; 3507 case SCTP_COOKIE_ACK: 3508 sctp_send_cookie_ack(stcb); 3509 break; 3510 case SCTP_ASCONF_ACK: 3511 /* resend last asconf ack */ 3512 sctp_send_asconf_ack(stcb); 3513 break; 3514 case SCTP_IFORWARD_CUM_TSN: 3515 case SCTP_FORWARD_CUM_TSN: 3516 send_forward_tsn(stcb, &stcb->asoc); 3517 break; 3518 /* can't do anything with these */ 3519 case SCTP_PACKET_DROPPED: 3520 case SCTP_INITIATION_ACK: /* this should not happen */ 3521 case SCTP_HEARTBEAT_ACK: 3522 case SCTP_ABORT_ASSOCIATION: 3523 case SCTP_OPERATION_ERROR: 3524 case SCTP_SHUTDOWN_COMPLETE: 3525 case SCTP_ECN_ECHO: 3526 case SCTP_ECN_CWR: 3527 default: 3528 break; 3529 } 3530 return (0); 3531 } 3532 3533 void 3534 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3535 { 3536 uint32_t i; 3537 uint16_t temp; 3538 3539 /* 3540 * We set things to 0xffffffff since this is the last delivered 3541 * sequence and we will be sending in 0 after the reset. 3542 */ 3543 3544 if (number_entries) { 3545 for (i = 0; i < number_entries; i++) { 3546 temp = ntohs(list[i]); 3547 if (temp >= stcb->asoc.streamincnt) { 3548 continue; 3549 } 3550 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3551 } 3552 } else { 3553 list = NULL; 3554 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3555 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3556 } 3557 } 3558 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3559 } 3560 3561 static void 3562 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3563 { 3564 uint32_t i; 3565 uint16_t temp; 3566 3567 if (number_entries > 0) { 3568 for (i = 0; i < number_entries; i++) { 3569 temp = ntohs(list[i]); 3570 if (temp >= stcb->asoc.streamoutcnt) { 3571 /* no such stream */ 3572 continue; 3573 } 3574 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3575 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3576 } 3577 } else { 3578 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3579 stcb->asoc.strmout[i].next_mid_ordered = 0; 3580 stcb->asoc.strmout[i].next_mid_unordered = 0; 3581 } 3582 } 3583 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3584 } 3585 3586 static void 3587 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3588 { 3589 uint32_t i; 3590 uint16_t temp; 3591 3592 if (number_entries > 0) { 3593 for (i = 0; i < number_entries; i++) { 3594 temp = ntohs(list[i]); 3595 if (temp >= stcb->asoc.streamoutcnt) { 3596 /* no such stream */ 3597 continue; 3598 } 3599 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3600 } 3601 } else { 3602 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3603 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3604 } 3605 } 3606 } 3607 3608 3609 struct sctp_stream_reset_request * 3610 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3611 { 3612 struct sctp_association *asoc; 3613 struct sctp_chunkhdr *ch; 3614 struct sctp_stream_reset_request *r; 3615 struct sctp_tmit_chunk *chk; 3616 int len, clen; 3617 3618 asoc = &stcb->asoc; 3619 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3620 asoc->stream_reset_outstanding = 0; 3621 return (NULL); 3622 } 3623 if (stcb->asoc.str_reset == NULL) { 3624 asoc->stream_reset_outstanding = 0; 3625 return (NULL); 3626 } 3627 chk = stcb->asoc.str_reset; 3628 if (chk->data == NULL) { 3629 return (NULL); 3630 } 3631 if (bchk) { 3632 /* he wants a copy of the chk pointer */ 3633 *bchk = chk; 3634 } 3635 clen = chk->send_size; 3636 ch = mtod(chk->data, struct sctp_chunkhdr *); 3637 r = (struct sctp_stream_reset_request *)(ch + 1); 3638 if (ntohl(r->request_seq) == seq) { 3639 /* found it */ 3640 return (r); 3641 } 3642 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3643 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3644 /* move to the next one, there can only be a max of two */ 3645 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3646 if (ntohl(r->request_seq) == seq) { 3647 return (r); 3648 } 3649 } 3650 /* that seq is not here */ 3651 return (NULL); 3652 } 3653 3654 static void 3655 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3656 { 3657 struct sctp_association *asoc; 3658 struct sctp_tmit_chunk *chk; 3659 3660 asoc = &stcb->asoc; 3661 chk = asoc->str_reset; 3662 if (chk == NULL) { 3663 return; 3664 } 3665 asoc->str_reset = NULL; 3666 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3667 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3668 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3669 asoc->ctrl_queue_cnt--; 3670 if (chk->data) { 3671 sctp_m_freem(chk->data); 3672 chk->data = NULL; 3673 } 3674 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3675 } 3676 3677 3678 static int 3679 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3680 uint32_t seq, uint32_t action, 3681 struct sctp_stream_reset_response *respin) 3682 { 3683 uint16_t type; 3684 int lparam_len; 3685 struct sctp_association *asoc = &stcb->asoc; 3686 struct sctp_tmit_chunk *chk; 3687 struct sctp_stream_reset_request *req_param; 3688 struct sctp_stream_reset_out_request *req_out_param; 3689 struct sctp_stream_reset_in_request *req_in_param; 3690 uint32_t number_entries; 3691 3692 if (asoc->stream_reset_outstanding == 0) { 3693 /* duplicate */ 3694 return (0); 3695 } 3696 if (seq == stcb->asoc.str_reset_seq_out) { 3697 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3698 if (req_param != NULL) { 3699 stcb->asoc.str_reset_seq_out++; 3700 type = ntohs(req_param->ph.param_type); 3701 lparam_len = ntohs(req_param->ph.param_length); 3702 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3703 int no_clear = 0; 3704 3705 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3706 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3707 asoc->stream_reset_out_is_outstanding = 0; 3708 if (asoc->stream_reset_outstanding) 3709 asoc->stream_reset_outstanding--; 3710 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3711 /* do it */ 3712 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3713 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3714 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3715 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3716 /* 3717 * Set it up so we don't stop 3718 * retransmitting 3719 */ 3720 asoc->stream_reset_outstanding++; 3721 stcb->asoc.str_reset_seq_out--; 3722 asoc->stream_reset_out_is_outstanding = 1; 3723 no_clear = 1; 3724 } else { 3725 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3726 } 3727 if (no_clear == 0) { 3728 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3729 } 3730 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3731 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3732 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3733 if (asoc->stream_reset_outstanding) 3734 asoc->stream_reset_outstanding--; 3735 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3736 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3737 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3738 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3739 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3740 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3741 } 3742 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3743 /* Ok we now may have more streams */ 3744 int num_stream; 3745 3746 num_stream = stcb->asoc.strm_pending_add_size; 3747 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3748 /* TSNH */ 3749 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3750 } 3751 stcb->asoc.strm_pending_add_size = 0; 3752 if (asoc->stream_reset_outstanding) 3753 asoc->stream_reset_outstanding--; 3754 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3755 /* Put the new streams into effect */ 3756 int i; 3757 3758 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3759 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3760 } 3761 asoc->streamoutcnt += num_stream; 3762 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3763 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3764 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3765 SCTP_STREAM_CHANGE_DENIED); 3766 } else { 3767 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3768 SCTP_STREAM_CHANGE_FAILED); 3769 } 3770 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3771 if (asoc->stream_reset_outstanding) 3772 asoc->stream_reset_outstanding--; 3773 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3774 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3775 SCTP_STREAM_CHANGE_DENIED); 3776 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3777 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3778 SCTP_STREAM_CHANGE_FAILED); 3779 } 3780 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3781 /** 3782 * a) Adopt the new in tsn. 3783 * b) reset the map 3784 * c) Adopt the new out-tsn 3785 */ 3786 struct sctp_stream_reset_response_tsn *resp; 3787 struct sctp_forward_tsn_chunk fwdtsn; 3788 int abort_flag = 0; 3789 3790 if (respin == NULL) { 3791 /* huh ? */ 3792 return (0); 3793 } 3794 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3795 return (0); 3796 } 3797 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3798 resp = (struct sctp_stream_reset_response_tsn *)respin; 3799 asoc->stream_reset_outstanding--; 3800 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3801 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3802 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3803 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3804 if (abort_flag) { 3805 return (1); 3806 } 3807 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3808 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3809 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3810 } 3811 3812 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3813 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3814 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3815 3816 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3817 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3818 3819 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3820 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3821 3822 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3823 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3824 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3825 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3826 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3827 SCTP_ASSOC_RESET_DENIED); 3828 } else { 3829 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3830 SCTP_ASSOC_RESET_FAILED); 3831 } 3832 } 3833 /* get rid of the request and get the request flags */ 3834 if (asoc->stream_reset_outstanding == 0) { 3835 sctp_clean_up_stream_reset(stcb); 3836 } 3837 } 3838 } 3839 if (asoc->stream_reset_outstanding == 0) { 3840 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3841 } 3842 return (0); 3843 } 3844 3845 static void 3846 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3847 struct sctp_tmit_chunk *chk, 3848 struct sctp_stream_reset_in_request *req, int trunc) 3849 { 3850 uint32_t seq; 3851 int len, i; 3852 int number_entries; 3853 uint16_t temp; 3854 3855 /* 3856 * peer wants me to send a str-reset to him for my outgoing seq's if 3857 * seq_in is right. 3858 */ 3859 struct sctp_association *asoc = &stcb->asoc; 3860 3861 seq = ntohl(req->request_seq); 3862 if (asoc->str_reset_seq_in == seq) { 3863 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3864 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3865 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3866 } else if (trunc) { 3867 /* Can't do it, since they exceeded our buffer size */ 3868 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3869 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3870 len = ntohs(req->ph.param_length); 3871 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3872 if (number_entries) { 3873 for (i = 0; i < number_entries; i++) { 3874 temp = ntohs(req->list_of_streams[i]); 3875 if (temp >= stcb->asoc.streamoutcnt) { 3876 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3877 goto bad_boy; 3878 } 3879 req->list_of_streams[i] = temp; 3880 } 3881 for (i = 0; i < number_entries; i++) { 3882 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3883 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3884 } 3885 } 3886 } else { 3887 /* Its all */ 3888 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3889 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3890 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3891 } 3892 } 3893 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3894 } else { 3895 /* Can't do it, since we have sent one out */ 3896 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3897 } 3898 bad_boy: 3899 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3900 asoc->str_reset_seq_in++; 3901 } else if (asoc->str_reset_seq_in - 1 == seq) { 3902 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3903 } else if (asoc->str_reset_seq_in - 2 == seq) { 3904 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3905 } else { 3906 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3907 } 3908 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3909 } 3910 3911 static int 3912 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3913 struct sctp_tmit_chunk *chk, 3914 struct sctp_stream_reset_tsn_request *req) 3915 { 3916 /* reset all in and out and update the tsn */ 3917 /* 3918 * A) reset my str-seq's on in and out. B) Select a receive next, 3919 * and set cum-ack to it. Also process this selected number as a 3920 * fwd-tsn as well. C) set in the response my next sending seq. 3921 */ 3922 struct sctp_forward_tsn_chunk fwdtsn; 3923 struct sctp_association *asoc = &stcb->asoc; 3924 int abort_flag = 0; 3925 uint32_t seq; 3926 3927 seq = ntohl(req->request_seq); 3928 if (asoc->str_reset_seq_in == seq) { 3929 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3930 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3931 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3932 } else { 3933 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3934 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3935 fwdtsn.ch.chunk_flags = 0; 3936 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3937 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3938 if (abort_flag) { 3939 return (1); 3940 } 3941 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3942 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3943 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3944 } 3945 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3946 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3947 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3948 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3949 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3950 atomic_add_int(&asoc->sending_seq, 1); 3951 /* save off historical data for retrans */ 3952 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3953 asoc->last_sending_seq[0] = asoc->sending_seq; 3954 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3955 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3956 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3957 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3958 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3959 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3960 } 3961 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3962 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3963 asoc->str_reset_seq_in++; 3964 } else if (asoc->str_reset_seq_in - 1 == seq) { 3965 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3966 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3967 } else if (asoc->str_reset_seq_in - 2 == seq) { 3968 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3969 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3970 } else { 3971 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3972 } 3973 return (0); 3974 } 3975 3976 static void 3977 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3978 struct sctp_tmit_chunk *chk, 3979 struct sctp_stream_reset_out_request *req, int trunc) 3980 { 3981 uint32_t seq, tsn; 3982 int number_entries, len; 3983 struct sctp_association *asoc = &stcb->asoc; 3984 3985 seq = ntohl(req->request_seq); 3986 3987 /* now if its not a duplicate we process it */ 3988 if (asoc->str_reset_seq_in == seq) { 3989 len = ntohs(req->ph.param_length); 3990 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3991 /* 3992 * the sender is resetting, handle the list issue.. we must 3993 * a) verify if we can do the reset, if so no problem b) If 3994 * we can't do the reset we must copy the request. c) queue 3995 * it, and setup the data in processor to trigger it off 3996 * when needed and dequeue all the queued data. 3997 */ 3998 tsn = ntohl(req->send_reset_at_tsn); 3999 4000 /* move the reset action back one */ 4001 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 4002 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 4003 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4004 } else if (trunc) { 4005 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4006 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 4007 /* we can do it now */ 4008 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 4009 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4010 } else { 4011 /* 4012 * we must queue it up and thus wait for the TSN's 4013 * to arrive that are at or before tsn 4014 */ 4015 struct sctp_stream_reset_list *liste; 4016 int siz; 4017 4018 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 4019 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 4020 siz, SCTP_M_STRESET); 4021 if (liste == NULL) { 4022 /* gak out of memory */ 4023 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4024 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4025 return; 4026 } 4027 liste->seq = seq; 4028 liste->tsn = tsn; 4029 liste->number_entries = number_entries; 4030 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 4031 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 4032 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 4033 } 4034 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4035 asoc->str_reset_seq_in++; 4036 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4037 /* 4038 * one seq back, just echo back last action since my 4039 * response was lost. 4040 */ 4041 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4042 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4043 /* 4044 * two seq back, just echo back last action since my 4045 * response was lost. 4046 */ 4047 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4048 } else { 4049 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4050 } 4051 } 4052 4053 static void 4054 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4055 struct sctp_stream_reset_add_strm *str_add) 4056 { 4057 /* 4058 * Peer is requesting to add more streams. If its within our 4059 * max-streams we will allow it. 4060 */ 4061 uint32_t num_stream, i; 4062 uint32_t seq; 4063 struct sctp_association *asoc = &stcb->asoc; 4064 struct sctp_queued_to_read *ctl, *nctl; 4065 4066 /* Get the number. */ 4067 seq = ntohl(str_add->request_seq); 4068 num_stream = ntohs(str_add->number_of_streams); 4069 /* Now what would be the new total? */ 4070 if (asoc->str_reset_seq_in == seq) { 4071 num_stream += stcb->asoc.streamincnt; 4072 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4073 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4074 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4075 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 4076 (num_stream > 0xffff)) { 4077 /* We must reject it they ask for to many */ 4078 denied: 4079 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4080 } else { 4081 /* Ok, we can do that :-) */ 4082 struct sctp_stream_in *oldstrm; 4083 4084 /* save off the old */ 4085 oldstrm = stcb->asoc.strmin; 4086 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 4087 (num_stream * sizeof(struct sctp_stream_in)), 4088 SCTP_M_STRMI); 4089 if (stcb->asoc.strmin == NULL) { 4090 stcb->asoc.strmin = oldstrm; 4091 goto denied; 4092 } 4093 /* copy off the old data */ 4094 for (i = 0; i < stcb->asoc.streamincnt; i++) { 4095 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4096 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4097 stcb->asoc.strmin[i].sid = i; 4098 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 4099 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 4100 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 4101 /* now anything on those queues? */ 4102 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 4103 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 4104 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 4105 } 4106 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 4107 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 4108 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 4109 } 4110 } 4111 /* Init the new streams */ 4112 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 4113 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 4114 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 4115 stcb->asoc.strmin[i].sid = i; 4116 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 4117 stcb->asoc.strmin[i].pd_api_started = 0; 4118 stcb->asoc.strmin[i].delivery_started = 0; 4119 } 4120 SCTP_FREE(oldstrm, SCTP_M_STRMI); 4121 /* update the size */ 4122 stcb->asoc.streamincnt = num_stream; 4123 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4124 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 4125 } 4126 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4127 asoc->str_reset_seq_in++; 4128 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4129 /* 4130 * one seq back, just echo back last action since my 4131 * response was lost. 4132 */ 4133 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4134 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4135 /* 4136 * two seq back, just echo back last action since my 4137 * response was lost. 4138 */ 4139 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4140 } else { 4141 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4142 4143 } 4144 } 4145 4146 static void 4147 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 4148 struct sctp_stream_reset_add_strm *str_add) 4149 { 4150 /* 4151 * Peer is requesting to add more streams. If its within our 4152 * max-streams we will allow it. 4153 */ 4154 uint16_t num_stream; 4155 uint32_t seq; 4156 struct sctp_association *asoc = &stcb->asoc; 4157 4158 /* Get the number. */ 4159 seq = ntohl(str_add->request_seq); 4160 num_stream = ntohs(str_add->number_of_streams); 4161 /* Now what would be the new total? */ 4162 if (asoc->str_reset_seq_in == seq) { 4163 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 4164 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 4165 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4166 } else if (stcb->asoc.stream_reset_outstanding) { 4167 /* We must reject it we have something pending */ 4168 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 4169 } else { 4170 /* Ok, we can do that :-) */ 4171 int mychk; 4172 4173 mychk = stcb->asoc.streamoutcnt; 4174 mychk += num_stream; 4175 if (mychk < 0x10000) { 4176 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 4177 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 4178 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4179 } 4180 } else { 4181 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 4182 } 4183 } 4184 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 4185 asoc->str_reset_seq_in++; 4186 } else if ((asoc->str_reset_seq_in - 1) == seq) { 4187 /* 4188 * one seq back, just echo back last action since my 4189 * response was lost. 4190 */ 4191 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 4192 } else if ((asoc->str_reset_seq_in - 2) == seq) { 4193 /* 4194 * two seq back, just echo back last action since my 4195 * response was lost. 4196 */ 4197 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 4198 } else { 4199 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 4200 } 4201 } 4202 4203 #ifdef __GNUC__ 4204 __attribute__((noinline)) 4205 #endif 4206 static int 4207 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 4208 struct sctp_chunkhdr *ch_req) 4209 { 4210 uint16_t remaining_length, param_len, ptype; 4211 struct sctp_paramhdr pstore; 4212 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 4213 uint32_t seq = 0; 4214 int num_req = 0; 4215 int trunc = 0; 4216 struct sctp_tmit_chunk *chk; 4217 struct sctp_chunkhdr *ch; 4218 struct sctp_paramhdr *ph; 4219 int ret_code = 0; 4220 int num_param = 0; 4221 4222 /* now it may be a reset or a reset-response */ 4223 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 4224 4225 /* setup for adding the response */ 4226 sctp_alloc_a_chunk(stcb, chk); 4227 if (chk == NULL) { 4228 return (ret_code); 4229 } 4230 chk->copy_by_ref = 0; 4231 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 4232 chk->rec.chunk_id.can_take_data = 0; 4233 chk->flags = 0; 4234 chk->asoc = &stcb->asoc; 4235 chk->no_fr_allowed = 0; 4236 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4237 chk->book_size_scale = 0; 4238 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4239 if (chk->data == NULL) { 4240 strres_nochunk: 4241 if (chk->data) { 4242 sctp_m_freem(chk->data); 4243 chk->data = NULL; 4244 } 4245 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4246 return (ret_code); 4247 } 4248 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4249 4250 /* setup chunk parameters */ 4251 chk->sent = SCTP_DATAGRAM_UNSENT; 4252 chk->snd_count = 0; 4253 chk->whoTo = NULL; 4254 4255 ch = mtod(chk->data, struct sctp_chunkhdr *); 4256 ch->chunk_type = SCTP_STREAM_RESET; 4257 ch->chunk_flags = 0; 4258 ch->chunk_length = htons(chk->send_size); 4259 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4260 offset += sizeof(struct sctp_chunkhdr); 4261 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4262 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4263 if (ph == NULL) { 4264 /* TSNH */ 4265 break; 4266 } 4267 param_len = ntohs(ph->param_length); 4268 if ((param_len > remaining_length) || 4269 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4270 /* bad parameter length */ 4271 break; 4272 } 4273 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4274 (uint8_t *)&cstore); 4275 if (ph == NULL) { 4276 /* TSNH */ 4277 break; 4278 } 4279 ptype = ntohs(ph->param_type); 4280 num_param++; 4281 if (param_len > sizeof(cstore)) { 4282 trunc = 1; 4283 } else { 4284 trunc = 0; 4285 } 4286 if (num_param > SCTP_MAX_RESET_PARAMS) { 4287 /* hit the max of parameters already sorry.. */ 4288 break; 4289 } 4290 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4291 struct sctp_stream_reset_out_request *req_out; 4292 4293 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4294 break; 4295 } 4296 req_out = (struct sctp_stream_reset_out_request *)ph; 4297 num_req++; 4298 if (stcb->asoc.stream_reset_outstanding) { 4299 seq = ntohl(req_out->response_seq); 4300 if (seq == stcb->asoc.str_reset_seq_out) { 4301 /* implicit ack */ 4302 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4303 } 4304 } 4305 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4306 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4307 struct sctp_stream_reset_add_strm *str_add; 4308 4309 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4310 break; 4311 } 4312 str_add = (struct sctp_stream_reset_add_strm *)ph; 4313 num_req++; 4314 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4315 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4316 struct sctp_stream_reset_add_strm *str_add; 4317 4318 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4319 break; 4320 } 4321 str_add = (struct sctp_stream_reset_add_strm *)ph; 4322 num_req++; 4323 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4324 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4325 struct sctp_stream_reset_in_request *req_in; 4326 4327 num_req++; 4328 req_in = (struct sctp_stream_reset_in_request *)ph; 4329 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4330 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4331 struct sctp_stream_reset_tsn_request *req_tsn; 4332 4333 num_req++; 4334 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4335 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4336 ret_code = 1; 4337 goto strres_nochunk; 4338 } 4339 /* no more */ 4340 break; 4341 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4342 struct sctp_stream_reset_response *resp; 4343 uint32_t result; 4344 4345 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4346 break; 4347 } 4348 resp = (struct sctp_stream_reset_response *)ph; 4349 seq = ntohl(resp->response_seq); 4350 result = ntohl(resp->result); 4351 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4352 ret_code = 1; 4353 goto strres_nochunk; 4354 } 4355 } else { 4356 break; 4357 } 4358 offset += SCTP_SIZE32(param_len); 4359 if (remaining_length >= SCTP_SIZE32(param_len)) { 4360 remaining_length -= SCTP_SIZE32(param_len); 4361 } else { 4362 remaining_length = 0; 4363 } 4364 } 4365 if (num_req == 0) { 4366 /* we have no response free the stuff */ 4367 goto strres_nochunk; 4368 } 4369 /* ok we have a chunk to link in */ 4370 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4371 chk, 4372 sctp_next); 4373 stcb->asoc.ctrl_queue_cnt++; 4374 return (ret_code); 4375 } 4376 4377 /* 4378 * Handle a router or endpoints report of a packet loss, there are two ways 4379 * to handle this, either we get the whole packet and must disect it 4380 * ourselves (possibly with truncation and or corruption) or it is a summary 4381 * from a middle box that did the disectting for us. 4382 */ 4383 static void 4384 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4385 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4386 { 4387 uint32_t bottle_bw, on_queue; 4388 uint16_t trunc_len; 4389 unsigned int chlen; 4390 unsigned int at; 4391 struct sctp_chunk_desc desc; 4392 struct sctp_chunkhdr *ch; 4393 4394 chlen = ntohs(cp->ch.chunk_length); 4395 chlen -= sizeof(struct sctp_pktdrop_chunk); 4396 /* XXX possible chlen underflow */ 4397 if (chlen == 0) { 4398 ch = NULL; 4399 if (cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) 4400 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4401 } else { 4402 ch = (struct sctp_chunkhdr *)(cp->data + sizeof(struct sctphdr)); 4403 chlen -= sizeof(struct sctphdr); 4404 /* XXX possible chlen underflow */ 4405 memset(&desc, 0, sizeof(desc)); 4406 } 4407 trunc_len = (uint16_t)ntohs(cp->trunc_len); 4408 if (trunc_len > limit) { 4409 trunc_len = limit; 4410 } 4411 4412 /* now the chunks themselves */ 4413 while ((ch != NULL) && (chlen >= sizeof(struct sctp_chunkhdr))) { 4414 desc.chunk_type = ch->chunk_type; 4415 /* get amount we need to move */ 4416 at = ntohs(ch->chunk_length); 4417 if (at < sizeof(struct sctp_chunkhdr)) { 4418 /* corrupt chunk, maybe at the end? */ 4419 SCTP_STAT_INCR(sctps_pdrpcrupt); 4420 break; 4421 } 4422 if (trunc_len == 0) { 4423 /* we are supposed to have all of it */ 4424 if (at > chlen) { 4425 /* corrupt skip it */ 4426 SCTP_STAT_INCR(sctps_pdrpcrupt); 4427 break; 4428 } 4429 } else { 4430 /* is there enough of it left ? */ 4431 if (desc.chunk_type == SCTP_DATA) { 4432 if (chlen < (sizeof(struct sctp_data_chunk) + 4433 sizeof(desc.data_bytes))) { 4434 break; 4435 } 4436 } else { 4437 if (chlen < sizeof(struct sctp_chunkhdr)) { 4438 break; 4439 } 4440 } 4441 } 4442 if (desc.chunk_type == SCTP_DATA) { 4443 /* can we get out the tsn? */ 4444 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4445 SCTP_STAT_INCR(sctps_pdrpmbda); 4446 4447 if (chlen >= (sizeof(struct sctp_data_chunk) + sizeof(uint32_t))) { 4448 /* yep */ 4449 struct sctp_data_chunk *dcp; 4450 uint8_t *ddp; 4451 unsigned int iii; 4452 4453 dcp = (struct sctp_data_chunk *)ch; 4454 ddp = (uint8_t *)(dcp + 1); 4455 for (iii = 0; iii < sizeof(desc.data_bytes); iii++) { 4456 desc.data_bytes[iii] = ddp[iii]; 4457 } 4458 desc.tsn_ifany = dcp->dp.tsn; 4459 } else { 4460 /* nope we are done. */ 4461 SCTP_STAT_INCR(sctps_pdrpnedat); 4462 break; 4463 } 4464 } else { 4465 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX)) 4466 SCTP_STAT_INCR(sctps_pdrpmbct); 4467 } 4468 4469 if (process_chunk_drop(stcb, &desc, net, cp->ch.chunk_flags)) { 4470 SCTP_STAT_INCR(sctps_pdrppdbrk); 4471 break; 4472 } 4473 if (SCTP_SIZE32(at) > chlen) { 4474 break; 4475 } 4476 chlen -= SCTP_SIZE32(at); 4477 if (chlen < sizeof(struct sctp_chunkhdr)) { 4478 /* done, none left */ 4479 break; 4480 } 4481 ch = (struct sctp_chunkhdr *)((caddr_t)ch + SCTP_SIZE32(at)); 4482 } 4483 /* Now update any rwnd --- possibly */ 4484 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4485 /* From a peer, we get a rwnd report */ 4486 uint32_t a_rwnd; 4487 4488 SCTP_STAT_INCR(sctps_pdrpfehos); 4489 4490 bottle_bw = ntohl(cp->bottle_bw); 4491 on_queue = ntohl(cp->current_onq); 4492 if (bottle_bw && on_queue) { 4493 /* a rwnd report is in here */ 4494 if (bottle_bw > on_queue) 4495 a_rwnd = bottle_bw - on_queue; 4496 else 4497 a_rwnd = 0; 4498 4499 if (a_rwnd == 0) 4500 stcb->asoc.peers_rwnd = 0; 4501 else { 4502 if (a_rwnd > stcb->asoc.total_flight) { 4503 stcb->asoc.peers_rwnd = 4504 a_rwnd - stcb->asoc.total_flight; 4505 } else { 4506 stcb->asoc.peers_rwnd = 0; 4507 } 4508 if (stcb->asoc.peers_rwnd < 4509 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4510 /* SWS sender side engages */ 4511 stcb->asoc.peers_rwnd = 0; 4512 } 4513 } 4514 } 4515 } else { 4516 SCTP_STAT_INCR(sctps_pdrpfmbox); 4517 } 4518 4519 /* now middle boxes in sat networks get a cwnd bump */ 4520 if ((cp->ch.chunk_flags & SCTP_FROM_MIDDLE_BOX) && 4521 (stcb->asoc.sat_t3_loss_recovery == 0) && 4522 (stcb->asoc.sat_network)) { 4523 /* 4524 * This is debatable but for sat networks it makes sense 4525 * Note if a T3 timer has went off, we will prohibit any 4526 * changes to cwnd until we exit the t3 loss recovery. 4527 */ 4528 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4529 net, cp, &bottle_bw, &on_queue); 4530 } 4531 } 4532 4533 /* 4534 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4535 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4536 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4537 * length of the complete packet outputs: - length: modified to remaining 4538 * length after control processing - netp: modified to new sctp_nets after 4539 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4540 * bad packet,...) otherwise return the tcb for this packet 4541 */ 4542 #ifdef __GNUC__ 4543 __attribute__((noinline)) 4544 #endif 4545 static struct sctp_tcb * 4546 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4547 struct sockaddr *src, struct sockaddr *dst, 4548 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4549 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4550 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4551 uint32_t vrf_id, uint16_t port) 4552 { 4553 struct sctp_association *asoc; 4554 struct mbuf *op_err; 4555 char msg[SCTP_DIAG_INFO_LEN]; 4556 uint32_t vtag_in; 4557 int num_chunks = 0; /* number of control chunks processed */ 4558 uint32_t chk_length, contiguous; 4559 int ret; 4560 int abort_no_unlock = 0; 4561 int ecne_seen = 0; 4562 4563 /* 4564 * How big should this be, and should it be alloc'd? Lets try the 4565 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4566 * until we get into jumbo grams and such.. 4567 */ 4568 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4569 int got_auth = 0; 4570 uint32_t auth_offset = 0, auth_len = 0; 4571 int auth_skipped = 0; 4572 int asconf_cnt = 0; 4573 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4574 struct socket *so; 4575 #endif 4576 4577 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4578 iphlen, *offset, length, (void *)stcb); 4579 4580 if (stcb) { 4581 SCTP_TCB_LOCK_ASSERT(stcb); 4582 } 4583 /* validate chunk header length... */ 4584 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4585 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4586 ntohs(ch->chunk_length)); 4587 *offset = length; 4588 return (stcb); 4589 } 4590 /* 4591 * validate the verification tag 4592 */ 4593 vtag_in = ntohl(sh->v_tag); 4594 4595 if (ch->chunk_type == SCTP_INITIATION) { 4596 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4597 ntohs(ch->chunk_length), vtag_in); 4598 if (vtag_in != 0) { 4599 /* protocol error- silently discard... */ 4600 SCTP_STAT_INCR(sctps_badvtag); 4601 if (stcb != NULL) { 4602 SCTP_TCB_UNLOCK(stcb); 4603 } 4604 return (NULL); 4605 } 4606 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4607 /* 4608 * If there is no stcb, skip the AUTH chunk and process 4609 * later after a stcb is found (to validate the lookup was 4610 * valid. 4611 */ 4612 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4613 (stcb == NULL) && 4614 (inp->auth_supported == 1)) { 4615 /* save this chunk for later processing */ 4616 auth_skipped = 1; 4617 auth_offset = *offset; 4618 auth_len = ntohs(ch->chunk_length); 4619 4620 /* (temporarily) move past this chunk */ 4621 *offset += SCTP_SIZE32(auth_len); 4622 if (*offset >= length) { 4623 /* no more data left in the mbuf chain */ 4624 *offset = length; 4625 return (NULL); 4626 } 4627 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4628 sizeof(struct sctp_chunkhdr), chunk_buf); 4629 } 4630 if (ch == NULL) { 4631 /* Help */ 4632 *offset = length; 4633 return (stcb); 4634 } 4635 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4636 goto process_control_chunks; 4637 } 4638 /* 4639 * first check if it's an ASCONF with an unknown src addr we 4640 * need to look inside to find the association 4641 */ 4642 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4643 struct sctp_chunkhdr *asconf_ch = ch; 4644 uint32_t asconf_offset = 0, asconf_len = 0; 4645 4646 /* inp's refcount may be reduced */ 4647 SCTP_INP_INCR_REF(inp); 4648 4649 asconf_offset = *offset; 4650 do { 4651 asconf_len = ntohs(asconf_ch->chunk_length); 4652 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4653 break; 4654 stcb = sctp_findassociation_ep_asconf(m, 4655 *offset, 4656 dst, 4657 sh, &inp, netp, vrf_id); 4658 if (stcb != NULL) 4659 break; 4660 asconf_offset += SCTP_SIZE32(asconf_len); 4661 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4662 sizeof(struct sctp_chunkhdr), chunk_buf); 4663 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4664 if (stcb == NULL) { 4665 /* 4666 * reduce inp's refcount if not reduced in 4667 * sctp_findassociation_ep_asconf(). 4668 */ 4669 SCTP_INP_DECR_REF(inp); 4670 } 4671 4672 /* now go back and verify any auth chunk to be sure */ 4673 if (auth_skipped && (stcb != NULL)) { 4674 struct sctp_auth_chunk *auth; 4675 4676 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4677 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4678 got_auth = 1; 4679 auth_skipped = 0; 4680 } else { 4681 auth = NULL; 4682 } 4683 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4684 auth_offset)) { 4685 /* auth HMAC failed so dump it */ 4686 *offset = length; 4687 return (stcb); 4688 } else { 4689 /* remaining chunks are HMAC checked */ 4690 stcb->asoc.authenticated = 1; 4691 } 4692 } 4693 } 4694 if (stcb == NULL) { 4695 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4696 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4697 msg); 4698 /* no association, so it's out of the blue... */ 4699 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4700 mflowtype, mflowid, inp->fibnum, 4701 vrf_id, port); 4702 *offset = length; 4703 return (NULL); 4704 } 4705 asoc = &stcb->asoc; 4706 /* ABORT and SHUTDOWN can use either v_tag... */ 4707 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4708 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4709 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4710 /* Take the T-bit always into account. */ 4711 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4712 (vtag_in == asoc->my_vtag)) || 4713 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4714 (asoc->peer_vtag != htonl(0)) && 4715 (vtag_in == asoc->peer_vtag))) { 4716 /* this is valid */ 4717 } else { 4718 /* drop this packet... */ 4719 SCTP_STAT_INCR(sctps_badvtag); 4720 if (stcb != NULL) { 4721 SCTP_TCB_UNLOCK(stcb); 4722 } 4723 return (NULL); 4724 } 4725 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4726 if (vtag_in != asoc->my_vtag) { 4727 /* 4728 * this could be a stale SHUTDOWN-ACK or the 4729 * peer never got the SHUTDOWN-COMPLETE and 4730 * is still hung; we have started a new asoc 4731 * but it won't complete until the shutdown 4732 * is completed 4733 */ 4734 if (stcb != NULL) { 4735 SCTP_TCB_UNLOCK(stcb); 4736 } 4737 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4738 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4739 msg); 4740 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4741 sh, inp, op_err, 4742 mflowtype, mflowid, fibnum, 4743 vrf_id, port); 4744 return (NULL); 4745 } 4746 } else { 4747 /* for all other chunks, vtag must match */ 4748 if (vtag_in != asoc->my_vtag) { 4749 /* invalid vtag... */ 4750 SCTPDBG(SCTP_DEBUG_INPUT3, 4751 "invalid vtag: %xh, expect %xh\n", 4752 vtag_in, asoc->my_vtag); 4753 SCTP_STAT_INCR(sctps_badvtag); 4754 if (stcb != NULL) { 4755 SCTP_TCB_UNLOCK(stcb); 4756 } 4757 *offset = length; 4758 return (NULL); 4759 } 4760 } 4761 } /* end if !SCTP_COOKIE_ECHO */ 4762 /* 4763 * process all control chunks... 4764 */ 4765 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4766 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4767 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4768 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4769 /* implied cookie-ack.. we must have lost the ack */ 4770 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4771 *netp); 4772 } 4773 4774 process_control_chunks: 4775 while (IS_SCTP_CONTROL(ch)) { 4776 /* validate chunk length */ 4777 chk_length = ntohs(ch->chunk_length); 4778 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4779 ch->chunk_type, chk_length); 4780 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4781 if (chk_length < sizeof(*ch) || 4782 (*offset + (int)chk_length) > length) { 4783 *offset = length; 4784 return (stcb); 4785 } 4786 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4787 /* 4788 * INIT and INIT-ACK only gets the init ack "header" portion 4789 * only because we don't have to process the peer's COOKIE. 4790 * All others get a complete chunk. 4791 */ 4792 switch (ch->chunk_type) { 4793 case SCTP_INITIATION: 4794 contiguous = sizeof(struct sctp_init_chunk); 4795 break; 4796 case SCTP_INITIATION_ACK: 4797 contiguous = sizeof(struct sctp_init_ack_chunk); 4798 break; 4799 default: 4800 contiguous = min(chk_length, sizeof(chunk_buf)); 4801 break; 4802 } 4803 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4804 contiguous, 4805 chunk_buf); 4806 if (ch == NULL) { 4807 *offset = length; 4808 if (stcb != NULL) { 4809 SCTP_TCB_UNLOCK(stcb); 4810 } 4811 return (NULL); 4812 } 4813 4814 num_chunks++; 4815 /* Save off the last place we got a control from */ 4816 if (stcb != NULL) { 4817 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4818 /* 4819 * allow last_control to be NULL if 4820 * ASCONF... ASCONF processing will find the 4821 * right net later 4822 */ 4823 if ((netp != NULL) && (*netp != NULL)) 4824 stcb->asoc.last_control_chunk_from = *netp; 4825 } 4826 } 4827 #ifdef SCTP_AUDITING_ENABLED 4828 sctp_audit_log(0xB0, ch->chunk_type); 4829 #endif 4830 4831 /* check to see if this chunk required auth, but isn't */ 4832 if ((stcb != NULL) && 4833 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4834 !stcb->asoc.authenticated) { 4835 /* "silently" ignore */ 4836 SCTP_STAT_INCR(sctps_recvauthmissing); 4837 goto next_chunk; 4838 } 4839 switch (ch->chunk_type) { 4840 case SCTP_INITIATION: 4841 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4842 /* The INIT chunk must be the only chunk. */ 4843 if ((num_chunks > 1) || 4844 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4845 /* RFC 4960 requires that no ABORT is sent */ 4846 *offset = length; 4847 if (stcb != NULL) { 4848 SCTP_TCB_UNLOCK(stcb); 4849 } 4850 return (NULL); 4851 } 4852 /* Honor our resource limit. */ 4853 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4854 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4855 sctp_abort_association(inp, stcb, m, iphlen, 4856 src, dst, sh, op_err, 4857 mflowtype, mflowid, 4858 vrf_id, port); 4859 *offset = length; 4860 return (NULL); 4861 } 4862 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4863 (struct sctp_init_chunk *)ch, inp, 4864 stcb, *netp, &abort_no_unlock, 4865 mflowtype, mflowid, 4866 vrf_id, port); 4867 *offset = length; 4868 if ((!abort_no_unlock) && (stcb != NULL)) { 4869 SCTP_TCB_UNLOCK(stcb); 4870 } 4871 return (NULL); 4872 break; 4873 case SCTP_PAD_CHUNK: 4874 break; 4875 case SCTP_INITIATION_ACK: 4876 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4877 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4878 /* We are not interested anymore */ 4879 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4880 ; 4881 } else { 4882 *offset = length; 4883 if (stcb != NULL) { 4884 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4885 so = SCTP_INP_SO(inp); 4886 atomic_add_int(&stcb->asoc.refcnt, 1); 4887 SCTP_TCB_UNLOCK(stcb); 4888 SCTP_SOCKET_LOCK(so, 1); 4889 SCTP_TCB_LOCK(stcb); 4890 atomic_subtract_int(&stcb->asoc.refcnt, 1); 4891 #endif 4892 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4893 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4894 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 4895 SCTP_SOCKET_UNLOCK(so, 1); 4896 #endif 4897 } 4898 return (NULL); 4899 } 4900 } 4901 /* The INIT-ACK chunk must be the only chunk. */ 4902 if ((num_chunks > 1) || 4903 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4904 *offset = length; 4905 return (stcb); 4906 } 4907 if ((netp != NULL) && (*netp != NULL)) { 4908 ret = sctp_handle_init_ack(m, iphlen, *offset, 4909 src, dst, sh, 4910 (struct sctp_init_ack_chunk *)ch, 4911 stcb, *netp, 4912 &abort_no_unlock, 4913 mflowtype, mflowid, 4914 vrf_id); 4915 } else { 4916 ret = -1; 4917 } 4918 *offset = length; 4919 if (abort_no_unlock) { 4920 return (NULL); 4921 } 4922 /* 4923 * Special case, I must call the output routine to 4924 * get the cookie echoed 4925 */ 4926 if ((stcb != NULL) && (ret == 0)) { 4927 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4928 } 4929 return (stcb); 4930 break; 4931 case SCTP_SELECTIVE_ACK: 4932 case SCTP_NR_SELECTIVE_ACK: 4933 { 4934 int abort_now = 0; 4935 uint32_t a_rwnd, cum_ack; 4936 uint16_t num_seg, num_nr_seg, num_dup; 4937 uint8_t flags; 4938 int offset_seg, offset_dup; 4939 4940 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4941 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4942 SCTP_STAT_INCR(sctps_recvsacks); 4943 if (stcb == NULL) { 4944 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4945 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4946 break; 4947 } 4948 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4949 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4950 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4951 break; 4952 } 4953 } else { 4954 if (stcb->asoc.nrsack_supported == 0) { 4955 goto unknown_chunk; 4956 } 4957 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4958 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4959 break; 4960 } 4961 } 4962 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4963 /*- 4964 * If we have sent a shutdown-ack, we will pay no 4965 * attention to a sack sent in to us since 4966 * we don't care anymore. 4967 */ 4968 break; 4969 } 4970 flags = ch->chunk_flags; 4971 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4972 struct sctp_sack_chunk *sack; 4973 4974 sack = (struct sctp_sack_chunk *)ch; 4975 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4976 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4977 num_nr_seg = 0; 4978 num_dup = ntohs(sack->sack.num_dup_tsns); 4979 a_rwnd = ntohl(sack->sack.a_rwnd); 4980 if (sizeof(struct sctp_sack_chunk) + 4981 num_seg * sizeof(struct sctp_gap_ack_block) + 4982 num_dup * sizeof(uint32_t) != chk_length) { 4983 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4984 break; 4985 } 4986 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4987 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4988 } else { 4989 struct sctp_nr_sack_chunk *nr_sack; 4990 4991 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4992 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4993 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4994 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4995 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4996 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4997 if (sizeof(struct sctp_nr_sack_chunk) + 4998 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4999 num_dup * sizeof(uint32_t) != chk_length) { 5000 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 5001 break; 5002 } 5003 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 5004 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 5005 } 5006 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 5007 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 5008 cum_ack, num_seg, a_rwnd); 5009 stcb->asoc.seen_a_sack_this_pkt = 1; 5010 if ((stcb->asoc.pr_sctp_cnt == 0) && 5011 (num_seg == 0) && (num_nr_seg == 0) && 5012 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 5013 (stcb->asoc.saw_sack_with_frags == 0) && 5014 (stcb->asoc.saw_sack_with_nr_frags == 0) && 5015 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 5016 /* 5017 * We have a SIMPLE sack having no 5018 * prior segments and data on sent 5019 * queue to be acked. Use the faster 5020 * path sack processing. We also 5021 * allow window update sacks with no 5022 * missing segments to go this way 5023 * too. 5024 */ 5025 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 5026 &abort_now, ecne_seen); 5027 } else { 5028 if ((netp != NULL) && (*netp != NULL)) { 5029 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 5030 num_seg, num_nr_seg, num_dup, &abort_now, flags, 5031 cum_ack, a_rwnd, ecne_seen); 5032 } 5033 } 5034 if (abort_now) { 5035 /* ABORT signal from sack processing */ 5036 *offset = length; 5037 return (NULL); 5038 } 5039 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 5040 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 5041 (stcb->asoc.stream_queue_cnt == 0)) { 5042 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 5043 } 5044 break; 5045 } 5046 case SCTP_HEARTBEAT_REQUEST: 5047 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 5048 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5049 SCTP_STAT_INCR(sctps_recvheartbeat); 5050 sctp_send_heartbeat_ack(stcb, m, *offset, 5051 chk_length, *netp); 5052 } 5053 break; 5054 case SCTP_HEARTBEAT_ACK: 5055 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 5056 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 5057 /* Its not ours */ 5058 *offset = length; 5059 return (stcb); 5060 } 5061 SCTP_STAT_INCR(sctps_recvheartbeatack); 5062 if ((netp != NULL) && (*netp != NULL)) { 5063 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 5064 stcb, *netp); 5065 } 5066 break; 5067 case SCTP_ABORT_ASSOCIATION: 5068 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 5069 (void *)stcb); 5070 *offset = length; 5071 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5072 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 5073 return (NULL); 5074 } else { 5075 return (stcb); 5076 } 5077 } else { 5078 return (NULL); 5079 } 5080 break; 5081 case SCTP_SHUTDOWN: 5082 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 5083 (void *)stcb); 5084 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 5085 *offset = length; 5086 return (stcb); 5087 } 5088 if ((netp != NULL) && (*netp != NULL)) { 5089 int abort_flag = 0; 5090 5091 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 5092 stcb, *netp, &abort_flag); 5093 if (abort_flag) { 5094 *offset = length; 5095 return (NULL); 5096 } 5097 } 5098 break; 5099 case SCTP_SHUTDOWN_ACK: 5100 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 5101 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5102 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 5103 } 5104 *offset = length; 5105 return (NULL); 5106 break; 5107 case SCTP_OPERATION_ERROR: 5108 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 5109 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 5110 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 5111 *offset = length; 5112 return (NULL); 5113 } 5114 break; 5115 case SCTP_COOKIE_ECHO: 5116 SCTPDBG(SCTP_DEBUG_INPUT3, 5117 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 5118 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 5119 ; 5120 } else { 5121 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5122 /* We are not interested anymore */ 5123 abend: 5124 if (stcb != NULL) { 5125 SCTP_TCB_UNLOCK(stcb); 5126 } 5127 *offset = length; 5128 return (NULL); 5129 } 5130 } 5131 /*- 5132 * First are we accepting? We do this again here 5133 * since it is possible that a previous endpoint WAS 5134 * listening responded to a INIT-ACK and then 5135 * closed. We opened and bound.. and are now no 5136 * longer listening. 5137 * 5138 * XXXGL: notes on checking listen queue length. 5139 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 5140 * SOLISTENING(), because a listening "UDP type" 5141 * socket isn't listening in terms of the socket 5142 * layer. It is a normal data flow socket, that 5143 * can fork off new connections. Thus, we should 5144 * look into sol_qlen only in case we are !UDP. 5145 * 2) Checking sol_qlen in general requires locking 5146 * the socket, and this code lacks that. 5147 */ 5148 if ((stcb == NULL) && 5149 (!SCTP_IS_LISTENING(inp) || 5150 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 5151 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 5152 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 5153 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 5154 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 5155 sctp_abort_association(inp, stcb, m, iphlen, 5156 src, dst, sh, op_err, 5157 mflowtype, mflowid, 5158 vrf_id, port); 5159 } 5160 *offset = length; 5161 return (NULL); 5162 } else { 5163 struct mbuf *ret_buf; 5164 struct sctp_inpcb *linp; 5165 struct sctp_tmit_chunk *chk; 5166 5167 if (stcb) { 5168 linp = NULL; 5169 } else { 5170 linp = inp; 5171 } 5172 5173 if (linp != NULL) { 5174 SCTP_ASOC_CREATE_LOCK(linp); 5175 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 5176 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 5177 SCTP_ASOC_CREATE_UNLOCK(linp); 5178 goto abend; 5179 } 5180 } 5181 5182 if (netp != NULL) { 5183 struct sctp_tcb *locked_stcb; 5184 5185 locked_stcb = stcb; 5186 ret_buf = 5187 sctp_handle_cookie_echo(m, iphlen, 5188 *offset, 5189 src, dst, 5190 sh, 5191 (struct sctp_cookie_echo_chunk *)ch, 5192 &inp, &stcb, netp, 5193 auth_skipped, 5194 auth_offset, 5195 auth_len, 5196 &locked_stcb, 5197 mflowtype, 5198 mflowid, 5199 vrf_id, 5200 port); 5201 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 5202 SCTP_TCB_UNLOCK(locked_stcb); 5203 } 5204 if (stcb != NULL) { 5205 SCTP_TCB_LOCK_ASSERT(stcb); 5206 } 5207 } else { 5208 ret_buf = NULL; 5209 } 5210 if (linp != NULL) { 5211 SCTP_ASOC_CREATE_UNLOCK(linp); 5212 } 5213 if (ret_buf == NULL) { 5214 if (stcb != NULL) { 5215 SCTP_TCB_UNLOCK(stcb); 5216 } 5217 SCTPDBG(SCTP_DEBUG_INPUT3, 5218 "GAK, null buffer\n"); 5219 *offset = length; 5220 return (NULL); 5221 } 5222 /* if AUTH skipped, see if it verified... */ 5223 if (auth_skipped) { 5224 got_auth = 1; 5225 auth_skipped = 0; 5226 } 5227 /* Restart the timer if we have pending data */ 5228 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 5229 if (chk->whoTo != NULL) { 5230 break; 5231 } 5232 } 5233 if (chk != NULL) { 5234 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 5235 } 5236 } 5237 break; 5238 case SCTP_COOKIE_ACK: 5239 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 5240 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 5241 return (stcb); 5242 } 5243 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5244 /* We are not interested anymore */ 5245 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 5246 ; 5247 } else if (stcb) { 5248 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5249 so = SCTP_INP_SO(inp); 5250 atomic_add_int(&stcb->asoc.refcnt, 1); 5251 SCTP_TCB_UNLOCK(stcb); 5252 SCTP_SOCKET_LOCK(so, 1); 5253 SCTP_TCB_LOCK(stcb); 5254 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5255 #endif 5256 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5257 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 5258 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5259 SCTP_SOCKET_UNLOCK(so, 1); 5260 #endif 5261 *offset = length; 5262 return (NULL); 5263 } 5264 } 5265 if ((netp != NULL) && (*netp != NULL)) { 5266 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5267 } 5268 break; 5269 case SCTP_ECN_ECHO: 5270 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5271 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 5272 /* Its not ours */ 5273 *offset = length; 5274 return (stcb); 5275 } 5276 if (stcb->asoc.ecn_supported == 0) { 5277 goto unknown_chunk; 5278 } 5279 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5280 ecne_seen = 1; 5281 break; 5282 case SCTP_ECN_CWR: 5283 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5284 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5285 *offset = length; 5286 return (stcb); 5287 } 5288 if (stcb->asoc.ecn_supported == 0) { 5289 goto unknown_chunk; 5290 } 5291 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5292 break; 5293 case SCTP_SHUTDOWN_COMPLETE: 5294 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5295 /* must be first and only chunk */ 5296 if ((num_chunks > 1) || 5297 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5298 *offset = length; 5299 return (stcb); 5300 } 5301 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5302 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5303 stcb, *netp); 5304 } 5305 *offset = length; 5306 return (NULL); 5307 break; 5308 case SCTP_ASCONF: 5309 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5310 if (stcb != NULL) { 5311 if (stcb->asoc.asconf_supported == 0) { 5312 goto unknown_chunk; 5313 } 5314 sctp_handle_asconf(m, *offset, src, 5315 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5316 asconf_cnt++; 5317 } 5318 break; 5319 case SCTP_ASCONF_ACK: 5320 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5321 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5322 /* Its not ours */ 5323 *offset = length; 5324 return (stcb); 5325 } 5326 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5327 if (stcb->asoc.asconf_supported == 0) { 5328 goto unknown_chunk; 5329 } 5330 /* He's alive so give him credit */ 5331 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5332 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5333 stcb->asoc.overall_error_count, 5334 0, 5335 SCTP_FROM_SCTP_INPUT, 5336 __LINE__); 5337 } 5338 stcb->asoc.overall_error_count = 0; 5339 sctp_handle_asconf_ack(m, *offset, 5340 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5341 if (abort_no_unlock) 5342 return (NULL); 5343 } 5344 break; 5345 case SCTP_FORWARD_CUM_TSN: 5346 case SCTP_IFORWARD_CUM_TSN: 5347 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_FWD_TSN\n"); 5348 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5349 /* Its not ours */ 5350 *offset = length; 5351 return (stcb); 5352 } 5353 5354 if (stcb != NULL) { 5355 int abort_flag = 0; 5356 5357 if (stcb->asoc.prsctp_supported == 0) { 5358 goto unknown_chunk; 5359 } 5360 *fwd_tsn_seen = 1; 5361 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5362 /* We are not interested anymore */ 5363 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5364 so = SCTP_INP_SO(inp); 5365 atomic_add_int(&stcb->asoc.refcnt, 1); 5366 SCTP_TCB_UNLOCK(stcb); 5367 SCTP_SOCKET_LOCK(so, 1); 5368 SCTP_TCB_LOCK(stcb); 5369 atomic_subtract_int(&stcb->asoc.refcnt, 1); 5370 #endif 5371 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5372 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5373 #if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING) 5374 SCTP_SOCKET_UNLOCK(so, 1); 5375 #endif 5376 *offset = length; 5377 return (NULL); 5378 } 5379 /* 5380 * For sending a SACK this looks like DATA 5381 * chunks. 5382 */ 5383 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5384 sctp_handle_forward_tsn(stcb, 5385 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5386 if (abort_flag) { 5387 *offset = length; 5388 return (NULL); 5389 } 5390 } 5391 break; 5392 case SCTP_STREAM_RESET: 5393 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5394 if (((stcb == NULL) || (ch == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req)))) { 5395 /* Its not ours */ 5396 *offset = length; 5397 return (stcb); 5398 } 5399 if (stcb->asoc.reconfig_supported == 0) { 5400 goto unknown_chunk; 5401 } 5402 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5403 /* stop processing */ 5404 *offset = length; 5405 return (NULL); 5406 } 5407 break; 5408 case SCTP_PACKET_DROPPED: 5409 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5410 /* re-get it all please */ 5411 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5412 /* Its not ours */ 5413 *offset = length; 5414 return (stcb); 5415 } 5416 5417 if ((ch != NULL) && (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5418 if (stcb->asoc.pktdrop_supported == 0) { 5419 goto unknown_chunk; 5420 } 5421 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5422 stcb, *netp, 5423 min(chk_length, contiguous)); 5424 } 5425 break; 5426 case SCTP_AUTHENTICATION: 5427 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5428 if (stcb == NULL) { 5429 /* save the first AUTH for later processing */ 5430 if (auth_skipped == 0) { 5431 auth_offset = *offset; 5432 auth_len = chk_length; 5433 auth_skipped = 1; 5434 } 5435 /* skip this chunk (temporarily) */ 5436 goto next_chunk; 5437 } 5438 if (stcb->asoc.auth_supported == 0) { 5439 goto unknown_chunk; 5440 } 5441 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5442 (chk_length > (sizeof(struct sctp_auth_chunk) + 5443 SCTP_AUTH_DIGEST_LEN_MAX))) { 5444 /* Its not ours */ 5445 *offset = length; 5446 return (stcb); 5447 } 5448 if (got_auth == 1) { 5449 /* skip this chunk... it's already auth'd */ 5450 goto next_chunk; 5451 } 5452 got_auth = 1; 5453 if ((ch == NULL) || sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, 5454 m, *offset)) { 5455 /* auth HMAC failed so dump the packet */ 5456 *offset = length; 5457 return (stcb); 5458 } else { 5459 /* remaining chunks are HMAC checked */ 5460 stcb->asoc.authenticated = 1; 5461 } 5462 break; 5463 5464 default: 5465 unknown_chunk: 5466 /* it's an unknown chunk! */ 5467 if ((ch->chunk_type & 0x40) && (stcb != NULL)) { 5468 struct sctp_gen_error_cause *cause; 5469 int len; 5470 5471 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5472 0, M_NOWAIT, 1, MT_DATA); 5473 if (op_err != NULL) { 5474 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5475 cause = mtod(op_err, struct sctp_gen_error_cause *); 5476 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5477 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5478 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5479 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5480 if (SCTP_BUF_NEXT(op_err) != NULL) { 5481 #ifdef SCTP_MBUF_LOGGING 5482 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5483 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5484 } 5485 #endif 5486 sctp_queue_op_err(stcb, op_err); 5487 } else { 5488 sctp_m_freem(op_err); 5489 } 5490 } 5491 } 5492 if ((ch->chunk_type & 0x80) == 0) { 5493 /* discard this packet */ 5494 *offset = length; 5495 return (stcb); 5496 } /* else skip this bad chunk and continue... */ 5497 break; 5498 } /* switch (ch->chunk_type) */ 5499 5500 5501 next_chunk: 5502 /* get the next chunk */ 5503 *offset += SCTP_SIZE32(chk_length); 5504 if (*offset >= length) { 5505 /* no more data left in the mbuf chain */ 5506 break; 5507 } 5508 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5509 sizeof(struct sctp_chunkhdr), chunk_buf); 5510 if (ch == NULL) { 5511 *offset = length; 5512 return (stcb); 5513 } 5514 } /* while */ 5515 5516 if ((asconf_cnt > 0) && (stcb != NULL)) { 5517 sctp_send_asconf_ack(stcb); 5518 } 5519 return (stcb); 5520 } 5521 5522 5523 /* 5524 * common input chunk processing (v4 and v6) 5525 */ 5526 void 5527 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5528 struct sockaddr *src, struct sockaddr *dst, 5529 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5530 uint8_t compute_crc, 5531 uint8_t ecn_bits, 5532 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5533 uint32_t vrf_id, uint16_t port) 5534 { 5535 uint32_t high_tsn; 5536 int fwd_tsn_seen = 0, data_processed = 0; 5537 struct mbuf *m = *mm, *op_err; 5538 char msg[SCTP_DIAG_INFO_LEN]; 5539 int un_sent; 5540 int cnt_ctrl_ready = 0; 5541 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5542 struct sctp_tcb *stcb = NULL; 5543 struct sctp_nets *net = NULL; 5544 5545 SCTP_STAT_INCR(sctps_recvdatagrams); 5546 #ifdef SCTP_AUDITING_ENABLED 5547 sctp_audit_log(0xE0, 1); 5548 sctp_auditing(0, inp, stcb, net); 5549 #endif 5550 if (compute_crc != 0) { 5551 uint32_t check, calc_check; 5552 5553 check = sh->checksum; 5554 sh->checksum = 0; 5555 calc_check = sctp_calculate_cksum(m, iphlen); 5556 sh->checksum = check; 5557 if (calc_check != check) { 5558 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5559 calc_check, check, (void *)m, length, iphlen); 5560 stcb = sctp_findassociation_addr(m, offset, src, dst, 5561 sh, ch, &inp, &net, vrf_id); 5562 #if defined(INET) || defined(INET6) 5563 if ((ch->chunk_type != SCTP_INITIATION) && 5564 (net != NULL) && (net->port != port)) { 5565 if (net->port == 0) { 5566 /* UDP encapsulation turned on. */ 5567 net->mtu -= sizeof(struct udphdr); 5568 if (stcb->asoc.smallest_mtu > net->mtu) { 5569 sctp_pathmtu_adjustment(stcb, net->mtu); 5570 } 5571 } else if (port == 0) { 5572 /* UDP encapsulation turned off. */ 5573 net->mtu += sizeof(struct udphdr); 5574 /* XXX Update smallest_mtu */ 5575 } 5576 net->port = port; 5577 } 5578 #endif 5579 if (net != NULL) { 5580 net->flowtype = mflowtype; 5581 net->flowid = mflowid; 5582 } 5583 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5584 if ((inp != NULL) && (stcb != NULL)) { 5585 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5586 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5587 } else if ((inp != NULL) && (stcb == NULL)) { 5588 inp_decr = inp; 5589 } 5590 SCTP_STAT_INCR(sctps_badsum); 5591 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5592 goto out; 5593 } 5594 } 5595 /* Destination port of 0 is illegal, based on RFC4960. */ 5596 if (sh->dest_port == 0) { 5597 SCTP_STAT_INCR(sctps_hdrops); 5598 goto out; 5599 } 5600 stcb = sctp_findassociation_addr(m, offset, src, dst, 5601 sh, ch, &inp, &net, vrf_id); 5602 #if defined(INET) || defined(INET6) 5603 if ((ch->chunk_type != SCTP_INITIATION) && 5604 (net != NULL) && (net->port != port)) { 5605 if (net->port == 0) { 5606 /* UDP encapsulation turned on. */ 5607 net->mtu -= sizeof(struct udphdr); 5608 if (stcb->asoc.smallest_mtu > net->mtu) { 5609 sctp_pathmtu_adjustment(stcb, net->mtu); 5610 } 5611 } else if (port == 0) { 5612 /* UDP encapsulation turned off. */ 5613 net->mtu += sizeof(struct udphdr); 5614 /* XXX Update smallest_mtu */ 5615 } 5616 net->port = port; 5617 } 5618 #endif 5619 if (net != NULL) { 5620 net->flowtype = mflowtype; 5621 net->flowid = mflowid; 5622 } 5623 if (inp == NULL) { 5624 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5625 SCTP_STAT_INCR(sctps_noport); 5626 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5627 goto out; 5628 } 5629 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5630 sctp_send_shutdown_complete2(src, dst, sh, 5631 mflowtype, mflowid, fibnum, 5632 vrf_id, port); 5633 goto out; 5634 } 5635 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5636 goto out; 5637 } 5638 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5639 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5640 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5641 (ch->chunk_type != SCTP_INIT))) { 5642 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5643 "Out of the blue"); 5644 sctp_send_abort(m, iphlen, src, dst, 5645 sh, 0, op_err, 5646 mflowtype, mflowid, fibnum, 5647 vrf_id, port); 5648 } 5649 } 5650 goto out; 5651 } else if (stcb == NULL) { 5652 inp_decr = inp; 5653 } 5654 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5655 (void *)m, iphlen, offset, length, (void *)stcb); 5656 if (stcb) { 5657 /* always clear this before beginning a packet */ 5658 stcb->asoc.authenticated = 0; 5659 stcb->asoc.seen_a_sack_this_pkt = 0; 5660 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5661 (void *)stcb, stcb->asoc.state); 5662 5663 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5664 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5665 /*- 5666 * If we hit here, we had a ref count 5667 * up when the assoc was aborted and the 5668 * timer is clearing out the assoc, we should 5669 * NOT respond to any packet.. its OOTB. 5670 */ 5671 SCTP_TCB_UNLOCK(stcb); 5672 stcb = NULL; 5673 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5674 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5675 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5676 msg); 5677 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5678 mflowtype, mflowid, inp->fibnum, 5679 vrf_id, port); 5680 goto out; 5681 } 5682 } 5683 if (IS_SCTP_CONTROL(ch)) { 5684 /* process the control portion of the SCTP packet */ 5685 /* sa_ignore NO_NULL_CHK */ 5686 stcb = sctp_process_control(m, iphlen, &offset, length, 5687 src, dst, sh, ch, 5688 inp, stcb, &net, &fwd_tsn_seen, 5689 mflowtype, mflowid, fibnum, 5690 vrf_id, port); 5691 if (stcb) { 5692 /* 5693 * This covers us if the cookie-echo was there and 5694 * it changes our INP. 5695 */ 5696 inp = stcb->sctp_ep; 5697 #if defined(INET) || defined(INET6) 5698 if ((ch->chunk_type != SCTP_INITIATION) && 5699 (net != NULL) && (net->port != port)) { 5700 if (net->port == 0) { 5701 /* UDP encapsulation turned on. */ 5702 net->mtu -= sizeof(struct udphdr); 5703 if (stcb->asoc.smallest_mtu > net->mtu) { 5704 sctp_pathmtu_adjustment(stcb, net->mtu); 5705 } 5706 } else if (port == 0) { 5707 /* UDP encapsulation turned off. */ 5708 net->mtu += sizeof(struct udphdr); 5709 /* XXX Update smallest_mtu */ 5710 } 5711 net->port = port; 5712 } 5713 #endif 5714 } 5715 } else { 5716 /* 5717 * no control chunks, so pre-process DATA chunks (these 5718 * checks are taken care of by control processing) 5719 */ 5720 5721 /* 5722 * if DATA only packet, and auth is required, then punt... 5723 * can't have authenticated without any AUTH (control) 5724 * chunks 5725 */ 5726 if ((stcb != NULL) && 5727 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5728 /* "silently" ignore */ 5729 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5730 SCTP_STAT_INCR(sctps_recvauthmissing); 5731 goto out; 5732 } 5733 if (stcb == NULL) { 5734 /* out of the blue DATA chunk */ 5735 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5736 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5737 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5738 msg); 5739 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5740 mflowtype, mflowid, fibnum, 5741 vrf_id, port); 5742 goto out; 5743 } 5744 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5745 /* v_tag mismatch! */ 5746 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5747 SCTP_STAT_INCR(sctps_badvtag); 5748 goto out; 5749 } 5750 } 5751 5752 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5753 if (stcb == NULL) { 5754 /* 5755 * no valid TCB for this packet, or we found it's a bad 5756 * packet while processing control, or we're done with this 5757 * packet (done or skip rest of data), so we drop it... 5758 */ 5759 goto out; 5760 } 5761 5762 /* 5763 * DATA chunk processing 5764 */ 5765 /* plow through the data chunks while length > offset */ 5766 5767 /* 5768 * Rest should be DATA only. Check authentication state if AUTH for 5769 * DATA is required. 5770 */ 5771 if ((length > offset) && 5772 (stcb != NULL) && 5773 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5774 !stcb->asoc.authenticated) { 5775 /* "silently" ignore */ 5776 SCTP_STAT_INCR(sctps_recvauthmissing); 5777 SCTPDBG(SCTP_DEBUG_AUTH1, 5778 "Data chunk requires AUTH, skipped\n"); 5779 goto trigger_send; 5780 } 5781 if (length > offset) { 5782 int retval; 5783 5784 /* 5785 * First check to make sure our state is correct. We would 5786 * not get here unless we really did have a tag, so we don't 5787 * abort if this happens, just dump the chunk silently. 5788 */ 5789 switch (SCTP_GET_STATE(stcb)) { 5790 case SCTP_STATE_COOKIE_ECHOED: 5791 /* 5792 * we consider data with valid tags in this state 5793 * shows us the cookie-ack was lost. Imply it was 5794 * there. 5795 */ 5796 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5797 break; 5798 case SCTP_STATE_COOKIE_WAIT: 5799 /* 5800 * We consider OOTB any data sent during asoc setup. 5801 */ 5802 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5803 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5804 msg); 5805 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5806 mflowtype, mflowid, inp->fibnum, 5807 vrf_id, port); 5808 goto out; 5809 /* sa_ignore NOTREACHED */ 5810 break; 5811 case SCTP_STATE_EMPTY: /* should not happen */ 5812 case SCTP_STATE_INUSE: /* should not happen */ 5813 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5814 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5815 default: 5816 goto out; 5817 /* sa_ignore NOTREACHED */ 5818 break; 5819 case SCTP_STATE_OPEN: 5820 case SCTP_STATE_SHUTDOWN_SENT: 5821 break; 5822 } 5823 /* plow through the data chunks while length > offset */ 5824 retval = sctp_process_data(mm, iphlen, &offset, length, 5825 inp, stcb, net, &high_tsn); 5826 if (retval == 2) { 5827 /* 5828 * The association aborted, NO UNLOCK needed since 5829 * the association is destroyed. 5830 */ 5831 stcb = NULL; 5832 goto out; 5833 } 5834 data_processed = 1; 5835 /* 5836 * Anything important needs to have been m_copy'ed in 5837 * process_data 5838 */ 5839 } 5840 5841 /* take care of ecn */ 5842 if ((data_processed == 1) && 5843 (stcb->asoc.ecn_supported == 1) && 5844 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5845 /* Yep, we need to add a ECNE */ 5846 sctp_send_ecn_echo(stcb, net, high_tsn); 5847 } 5848 5849 if ((data_processed == 0) && (fwd_tsn_seen)) { 5850 int was_a_gap; 5851 uint32_t highest_tsn; 5852 5853 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5854 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5855 } else { 5856 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5857 } 5858 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5859 stcb->asoc.send_sack = 1; 5860 sctp_sack_check(stcb, was_a_gap); 5861 } else if (fwd_tsn_seen) { 5862 stcb->asoc.send_sack = 1; 5863 } 5864 /* trigger send of any chunks in queue... */ 5865 trigger_send: 5866 #ifdef SCTP_AUDITING_ENABLED 5867 sctp_audit_log(0xE0, 2); 5868 sctp_auditing(1, inp, stcb, net); 5869 #endif 5870 SCTPDBG(SCTP_DEBUG_INPUT1, 5871 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5872 stcb->asoc.peers_rwnd, 5873 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5874 stcb->asoc.total_flight); 5875 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5876 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5877 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5878 } 5879 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5880 cnt_ctrl_ready || 5881 stcb->asoc.trigger_reset || 5882 ((un_sent) && 5883 (stcb->asoc.peers_rwnd > 0 || 5884 (stcb->asoc.peers_rwnd <= 0 && stcb->asoc.total_flight == 0)))) { 5885 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5886 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5887 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5888 } 5889 #ifdef SCTP_AUDITING_ENABLED 5890 sctp_audit_log(0xE0, 3); 5891 sctp_auditing(2, inp, stcb, net); 5892 #endif 5893 out: 5894 if (stcb != NULL) { 5895 SCTP_TCB_UNLOCK(stcb); 5896 } 5897 if (inp_decr != NULL) { 5898 /* reduce ref-count */ 5899 SCTP_INP_WLOCK(inp_decr); 5900 SCTP_INP_DECR_REF(inp_decr); 5901 SCTP_INP_WUNLOCK(inp_decr); 5902 } 5903 return; 5904 } 5905 5906 #ifdef INET 5907 void 5908 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5909 { 5910 struct mbuf *m; 5911 int iphlen; 5912 uint32_t vrf_id = 0; 5913 uint8_t ecn_bits; 5914 struct sockaddr_in src, dst; 5915 struct ip *ip; 5916 struct sctphdr *sh; 5917 struct sctp_chunkhdr *ch; 5918 int length, offset; 5919 uint8_t compute_crc; 5920 uint32_t mflowid; 5921 uint8_t mflowtype; 5922 uint16_t fibnum; 5923 5924 iphlen = off; 5925 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5926 SCTP_RELEASE_PKT(i_pak); 5927 return; 5928 } 5929 m = SCTP_HEADER_TO_CHAIN(i_pak); 5930 #ifdef SCTP_MBUF_LOGGING 5931 /* Log in any input mbufs */ 5932 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5933 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5934 } 5935 #endif 5936 #ifdef SCTP_PACKET_LOGGING 5937 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5938 sctp_packet_log(m); 5939 } 5940 #endif 5941 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5942 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5943 m->m_pkthdr.len, 5944 if_name(m->m_pkthdr.rcvif), 5945 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5946 mflowid = m->m_pkthdr.flowid; 5947 mflowtype = M_HASHTYPE_GET(m); 5948 fibnum = M_GETFIB(m); 5949 SCTP_STAT_INCR(sctps_recvpackets); 5950 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5951 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5952 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5953 if (SCTP_BUF_LEN(m) < offset) { 5954 if ((m = m_pullup(m, offset)) == NULL) { 5955 SCTP_STAT_INCR(sctps_hdrops); 5956 return; 5957 } 5958 } 5959 ip = mtod(m, struct ip *); 5960 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5961 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5962 offset -= sizeof(struct sctp_chunkhdr); 5963 memset(&src, 0, sizeof(struct sockaddr_in)); 5964 src.sin_family = AF_INET; 5965 src.sin_len = sizeof(struct sockaddr_in); 5966 src.sin_port = sh->src_port; 5967 src.sin_addr = ip->ip_src; 5968 memset(&dst, 0, sizeof(struct sockaddr_in)); 5969 dst.sin_family = AF_INET; 5970 dst.sin_len = sizeof(struct sockaddr_in); 5971 dst.sin_port = sh->dest_port; 5972 dst.sin_addr = ip->ip_dst; 5973 length = ntohs(ip->ip_len); 5974 /* Validate mbuf chain length with IP payload length. */ 5975 if (SCTP_HEADER_LEN(m) != length) { 5976 SCTPDBG(SCTP_DEBUG_INPUT1, 5977 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5978 SCTP_STAT_INCR(sctps_hdrops); 5979 goto out; 5980 } 5981 /* SCTP does not allow broadcasts or multicasts */ 5982 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5983 goto out; 5984 } 5985 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5986 goto out; 5987 } 5988 ecn_bits = ip->ip_tos; 5989 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5990 SCTP_STAT_INCR(sctps_recvhwcrc); 5991 compute_crc = 0; 5992 } else { 5993 SCTP_STAT_INCR(sctps_recvswcrc); 5994 compute_crc = 1; 5995 } 5996 sctp_common_input_processing(&m, iphlen, offset, length, 5997 (struct sockaddr *)&src, 5998 (struct sockaddr *)&dst, 5999 sh, ch, 6000 compute_crc, 6001 ecn_bits, 6002 mflowtype, mflowid, fibnum, 6003 vrf_id, port); 6004 out: 6005 if (m) { 6006 sctp_m_freem(m); 6007 } 6008 return; 6009 } 6010 6011 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6012 extern int *sctp_cpuarry; 6013 #endif 6014 6015 int 6016 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 6017 { 6018 struct mbuf *m; 6019 int off; 6020 6021 m = *mp; 6022 off = *offp; 6023 #if defined(__FreeBSD__) && defined(SCTP_MCORE_INPUT) && defined(SMP) 6024 if (mp_ncpus > 1) { 6025 struct ip *ip; 6026 struct sctphdr *sh; 6027 int offset; 6028 int cpu_to_use; 6029 uint32_t flowid, tag; 6030 6031 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 6032 flowid = m->m_pkthdr.flowid; 6033 } else { 6034 /* 6035 * No flow id built by lower layers fix it so we 6036 * create one. 6037 */ 6038 offset = off + sizeof(struct sctphdr); 6039 if (SCTP_BUF_LEN(m) < offset) { 6040 if ((m = m_pullup(m, offset)) == NULL) { 6041 SCTP_STAT_INCR(sctps_hdrops); 6042 return (IPPROTO_DONE); 6043 } 6044 } 6045 ip = mtod(m, struct ip *); 6046 sh = (struct sctphdr *)((caddr_t)ip + off); 6047 tag = htonl(sh->v_tag); 6048 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 6049 m->m_pkthdr.flowid = flowid; 6050 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 6051 } 6052 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 6053 sctp_queue_to_mcore(m, off, cpu_to_use); 6054 return (IPPROTO_DONE); 6055 } 6056 #endif 6057 sctp_input_with_port(m, off, 0); 6058 return (IPPROTO_DONE); 6059 } 6060 #endif 6061