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 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* Validate parameters */ 102 init = &cp->init; 103 if (ntohl(init->initiate_tag) == 0) { 104 goto outnow; 105 } 106 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 107 (ntohs(init->num_inbound_streams) == 0) || 108 (ntohs(init->num_outbound_streams) == 0)) { 109 /* protocol error... send abort */ 110 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 111 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 112 mflowtype, mflowid, inp->fibnum, 113 vrf_id, port); 114 goto outnow; 115 } 116 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 117 offset + ntohs(cp->ch.chunk_length))) { 118 /* auth parameter(s) error... send abort */ 119 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 120 "Problem with AUTH parameters"); 121 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 122 mflowtype, mflowid, inp->fibnum, 123 vrf_id, port); 124 goto outnow; 125 } 126 /* We are only accepting if we have a listening socket. */ 127 if ((stcb == NULL) && 128 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 129 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 130 (!SCTP_IS_LISTENING(inp)))) { 131 /* 132 * FIX ME ?? What about TCP model and we have a 133 * match/restart case? Actually no fix is needed. the lookup 134 * will always find the existing assoc so stcb would not be 135 * NULL. It may be questionable to do this since we COULD 136 * just send back the INIT-ACK and hope that the app did 137 * accept()'s by the time the COOKIE was sent. But there is 138 * a price to pay for COOKIE generation and I don't want to 139 * pay it on the chance that the app will actually do some 140 * accepts(). The App just looses and should NOT be in this 141 * state :-) 142 */ 143 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 144 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 145 "No listener"); 146 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 147 mflowtype, mflowid, inp->fibnum, 148 vrf_id, port); 149 } 150 goto outnow; 151 } 152 if ((stcb != NULL) && 153 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 154 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 155 sctp_send_shutdown_ack(stcb, NULL); 156 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 157 } else { 158 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 159 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 160 src, dst, sh, cp, 161 mflowtype, mflowid, 162 vrf_id, port); 163 } 164 outnow: 165 if (stcb == NULL) { 166 SCTP_INP_RUNLOCK(inp); 167 } 168 } 169 170 /* 171 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 172 */ 173 174 int 175 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 176 { 177 int unsent_data; 178 unsigned int i; 179 struct sctp_stream_queue_pending *sp; 180 struct sctp_association *asoc; 181 182 SCTP_TCB_LOCK_ASSERT(stcb); 183 184 /* 185 * This function returns if any stream has true unsent data on it. 186 * Note that as it looks through it will clean up any places that 187 * have old data that has been sent but left at top of stream queue. 188 */ 189 asoc = &stcb->asoc; 190 unsent_data = 0; 191 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 192 /* Check to see if some data queued */ 193 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 194 /* sa_ignore FREED_MEMORY */ 195 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 196 if (sp == NULL) { 197 continue; 198 } 199 if ((sp->msg_is_complete) && 200 (sp->length == 0) && 201 (sp->sender_all_done)) { 202 /* 203 * We are doing differed cleanup. Last time 204 * through when we took all the data the 205 * sender_all_done was not set. 206 */ 207 if (sp->put_last_out == 0) { 208 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 209 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 210 sp->sender_all_done, 211 sp->length, 212 sp->msg_is_complete, 213 sp->put_last_out); 214 } 215 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 216 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 217 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 218 if (sp->net) { 219 sctp_free_remote_addr(sp->net); 220 sp->net = NULL; 221 } 222 if (sp->data) { 223 sctp_m_freem(sp->data); 224 sp->data = NULL; 225 } 226 sctp_free_a_strmoq(stcb, sp, so_locked); 227 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 228 unsent_data++; 229 } 230 } else { 231 unsent_data++; 232 } 233 if (unsent_data > 0) { 234 break; 235 } 236 } 237 } 238 return (unsent_data); 239 } 240 241 static int 242 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 243 { 244 struct sctp_init *init; 245 struct sctp_association *asoc; 246 struct sctp_nets *lnet; 247 unsigned int i; 248 249 SCTP_TCB_LOCK_ASSERT(stcb); 250 251 init = &cp->init; 252 asoc = &stcb->asoc; 253 /* save off parameters */ 254 asoc->peer_vtag = ntohl(init->initiate_tag); 255 asoc->peers_rwnd = ntohl(init->a_rwnd); 256 /* init tsn's */ 257 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 258 259 if (!TAILQ_EMPTY(&asoc->nets)) { 260 /* update any ssthresh's that may have a default */ 261 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 262 lnet->ssthresh = asoc->peers_rwnd; 263 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 264 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 265 } 266 } 267 } 268 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 269 unsigned int newcnt; 270 struct sctp_stream_out *outs; 271 struct sctp_stream_queue_pending *sp, *nsp; 272 struct sctp_tmit_chunk *chk, *nchk; 273 274 /* abandon the upper streams */ 275 newcnt = ntohs(init->num_inbound_streams); 276 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 277 if (chk->rec.data.sid >= newcnt) { 278 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 279 asoc->send_queue_cnt--; 280 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 281 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 282 #ifdef INVARIANTS 283 } else { 284 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 285 #endif 286 } 287 if (chk->data != NULL) { 288 sctp_free_bufspace(stcb, asoc, chk, 1); 289 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 290 0, chk, SCTP_SO_NOT_LOCKED); 291 if (chk->data) { 292 sctp_m_freem(chk->data); 293 chk->data = NULL; 294 } 295 } 296 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 297 /* sa_ignore FREED_MEMORY */ 298 } 299 } 300 if (asoc->strmout) { 301 for (i = newcnt; i < asoc->pre_open_streams; i++) { 302 outs = &asoc->strmout[i]; 303 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 304 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 305 TAILQ_REMOVE(&outs->outqueue, sp, next); 306 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 307 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 308 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 309 if (sp->data) { 310 sctp_m_freem(sp->data); 311 sp->data = NULL; 312 } 313 if (sp->net) { 314 sctp_free_remote_addr(sp->net); 315 sp->net = NULL; 316 } 317 /* Free the chunk */ 318 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 319 /* sa_ignore FREED_MEMORY */ 320 } 321 outs->state = SCTP_STREAM_CLOSED; 322 } 323 } 324 /* cut back the count */ 325 asoc->pre_open_streams = newcnt; 326 } 327 asoc->streamoutcnt = asoc->pre_open_streams; 328 if (asoc->strmout) { 329 for (i = 0; i < asoc->streamoutcnt; i++) { 330 asoc->strmout[i].state = SCTP_STREAM_OPEN; 331 } 332 } 333 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 334 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 335 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 336 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 337 } 338 /* This is the next one we expect */ 339 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 340 341 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 342 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 343 344 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 345 /* open the requested streams */ 346 347 if (asoc->strmin != NULL) { 348 /* Free the old ones */ 349 for (i = 0; i < asoc->streamincnt; i++) { 350 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 351 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 352 } 353 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 354 } 355 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 356 asoc->streamincnt = ntohs(init->num_outbound_streams); 357 } else { 358 asoc->streamincnt = asoc->max_inbound_streams; 359 } 360 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 361 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 362 if (asoc->strmin == NULL) { 363 /* we didn't get memory for the streams! */ 364 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 365 return (-1); 366 } 367 for (i = 0; i < asoc->streamincnt; i++) { 368 asoc->strmin[i].sid = i; 369 asoc->strmin[i].last_mid_delivered = 0xffffffff; 370 TAILQ_INIT(&asoc->strmin[i].inqueue); 371 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 372 asoc->strmin[i].pd_api_started = 0; 373 asoc->strmin[i].delivery_started = 0; 374 } 375 /* 376 * load_address_from_init will put the addresses into the 377 * association when the COOKIE is processed or the INIT-ACK is 378 * processed. Both types of COOKIE's existing and new call this 379 * routine. It will remove addresses that are no longer in the 380 * association (for the restarting case where addresses are 381 * removed). Up front when the INIT arrives we will discard it if it 382 * is a restart and new addresses have been added. 383 */ 384 /* sa_ignore MEMLEAK */ 385 return (0); 386 } 387 388 /* 389 * INIT-ACK message processing/consumption returns value < 0 on error 390 */ 391 static int 392 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 393 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 394 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 395 struct sctp_nets *net, int *abort_no_unlock, 396 uint8_t mflowtype, uint32_t mflowid, 397 uint32_t vrf_id) 398 { 399 struct sctp_association *asoc; 400 struct mbuf *op_err; 401 int retval, abort_flag, cookie_found; 402 int initack_limit; 403 int nat_friendly = 0; 404 405 /* First verify that we have no illegal param's */ 406 abort_flag = 0; 407 cookie_found = 0; 408 409 op_err = sctp_arethere_unrecognized_parameters(m, 410 (offset + sizeof(struct sctp_init_chunk)), 411 &abort_flag, (struct sctp_chunkhdr *)cp, 412 &nat_friendly, &cookie_found); 413 if (abort_flag) { 414 /* Send an abort and notify peer */ 415 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 416 src, dst, sh, op_err, 417 mflowtype, mflowid, 418 vrf_id, net->port); 419 *abort_no_unlock = 1; 420 return (-1); 421 } 422 if (!cookie_found) { 423 uint16_t len; 424 425 /* Only report the missing cookie parameter */ 426 if (op_err != NULL) { 427 sctp_m_freem(op_err); 428 } 429 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 430 /* We abort with an error of missing mandatory param */ 431 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 432 if (op_err != NULL) { 433 struct sctp_error_missing_param *cause; 434 435 SCTP_BUF_LEN(op_err) = len; 436 cause = mtod(op_err, struct sctp_error_missing_param *); 437 /* Subtract the reserved param */ 438 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 439 cause->cause.length = htons(len); 440 cause->num_missing_params = htonl(1); 441 cause->type[0] = htons(SCTP_STATE_COOKIE); 442 } 443 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 444 src, dst, sh, op_err, 445 mflowtype, mflowid, 446 vrf_id, net->port); 447 *abort_no_unlock = 1; 448 return (-3); 449 } 450 asoc = &stcb->asoc; 451 asoc->peer_supports_nat = (uint8_t)nat_friendly; 452 /* process the peer's parameters in the INIT-ACK */ 453 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 454 if (op_err != NULL) { 455 sctp_m_freem(op_err); 456 } 457 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 458 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 459 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 460 src, dst, sh, op_err, 461 mflowtype, mflowid, 462 vrf_id, net->port); 463 *abort_no_unlock = 1; 464 return (-1); 465 } 466 initack_limit = offset + ntohs(cp->ch.chunk_length); 467 /* load all addresses */ 468 if ((retval = sctp_load_addresses_from_init(stcb, m, 469 offset + sizeof(struct sctp_init_chunk), 470 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 471 if (op_err != NULL) { 472 sctp_m_freem(op_err); 473 } 474 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 475 "Problem with address parameters"); 476 SCTPDBG(SCTP_DEBUG_INPUT1, 477 "Load addresses from INIT causes an abort %d\n", 478 retval); 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-1); 485 } 486 /* if the peer doesn't support asconf, flush the asconf queue */ 487 if (asoc->asconf_supported == 0) { 488 struct sctp_asconf_addr *param, *nparam; 489 490 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 491 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 492 SCTP_FREE(param, SCTP_M_ASC_ADDR); 493 } 494 } 495 496 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 497 stcb->asoc.local_hmacs); 498 if (op_err) { 499 sctp_queue_op_err(stcb, op_err); 500 /* queuing will steal away the mbuf chain to the out queue */ 501 op_err = NULL; 502 } 503 /* extract the cookie and queue it to "echo" it back... */ 504 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 505 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 506 stcb->asoc.overall_error_count, 507 0, 508 SCTP_FROM_SCTP_INPUT, 509 __LINE__); 510 } 511 512 /* 513 * Cancel the INIT timer, We do this first before queueing the 514 * cookie. We always cancel at the primary to assume that we are 515 * canceling the timer started by the INIT which always goes to the 516 * primary. 517 */ 518 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 519 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 520 521 /* calculate the RTO */ 522 if (asoc->overall_error_count == 0) { 523 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 524 SCTP_RTT_FROM_NON_DATA); 525 } 526 stcb->asoc.overall_error_count = 0; 527 net->error_count = 0; 528 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 529 return (retval); 530 } 531 532 static void 533 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 534 struct sctp_tcb *stcb, struct sctp_nets *net) 535 { 536 union sctp_sockstore store; 537 struct sctp_nets *r_net, *f_net; 538 struct timeval tv; 539 int req_prim = 0; 540 uint16_t old_error_counter; 541 542 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 543 /* Invalid length */ 544 return; 545 } 546 547 memset(&store, 0, sizeof(store)); 548 switch (cp->heartbeat.hb_info.addr_family) { 549 #ifdef INET 550 case AF_INET: 551 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 552 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 553 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 554 store.sin.sin_port = stcb->rport; 555 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 556 sizeof(store.sin.sin_addr)); 557 } else { 558 return; 559 } 560 break; 561 #endif 562 #ifdef INET6 563 case AF_INET6: 564 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 565 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 566 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 567 store.sin6.sin6_port = stcb->rport; 568 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 569 } else { 570 return; 571 } 572 break; 573 #endif 574 default: 575 return; 576 } 577 r_net = sctp_findnet(stcb, &store.sa); 578 if (r_net == NULL) { 579 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 580 return; 581 } 582 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 583 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 584 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 585 /* 586 * If the its a HB and it's random value is correct when can 587 * confirm the destination. 588 */ 589 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 590 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 591 stcb->asoc.primary_destination = r_net; 592 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 593 f_net = TAILQ_FIRST(&stcb->asoc.nets); 594 if (f_net != r_net) { 595 /* 596 * first one on the list is NOT the primary 597 * sctp_cmpaddr() is much more efficient if 598 * the primary is the first on the list, 599 * make it so. 600 */ 601 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 602 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 603 } 604 req_prim = 1; 605 } 606 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 607 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 608 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 609 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 610 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 611 } 612 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 613 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 614 stcb->asoc.overall_error_count, 615 0, 616 SCTP_FROM_SCTP_INPUT, 617 __LINE__); 618 } 619 stcb->asoc.overall_error_count = 0; 620 old_error_counter = r_net->error_count; 621 r_net->error_count = 0; 622 r_net->hb_responded = 1; 623 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 624 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 625 /* Now lets do a RTO with this */ 626 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 627 SCTP_RTT_FROM_NON_DATA); 628 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 629 r_net->dest_state |= SCTP_ADDR_REACHABLE; 630 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 631 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 632 } 633 if (r_net->dest_state & SCTP_ADDR_PF) { 634 r_net->dest_state &= ~SCTP_ADDR_PF; 635 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 636 } 637 if (old_error_counter > 0) { 638 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 639 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 640 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 641 } 642 if (r_net == stcb->asoc.primary_destination) { 643 if (stcb->asoc.alternate) { 644 /* release the alternate, primary is good */ 645 sctp_free_remote_addr(stcb->asoc.alternate); 646 stcb->asoc.alternate = NULL; 647 } 648 } 649 /* Mobility adaptation */ 650 if (req_prim) { 651 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 652 SCTP_MOBILITY_BASE) || 653 sctp_is_mobility_feature_on(stcb->sctp_ep, 654 SCTP_MOBILITY_FASTHANDOFF)) && 655 sctp_is_mobility_feature_on(stcb->sctp_ep, 656 SCTP_MOBILITY_PRIM_DELETED)) { 657 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 658 stcb->sctp_ep, stcb, NULL, 659 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 660 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 661 SCTP_MOBILITY_FASTHANDOFF)) { 662 sctp_assoc_immediate_retrans(stcb, 663 stcb->asoc.primary_destination); 664 } 665 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 666 SCTP_MOBILITY_BASE)) { 667 sctp_move_chunks_from_net(stcb, 668 stcb->asoc.deleted_primary); 669 } 670 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 671 } 672 } 673 } 674 675 static int 676 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 677 { 678 /* 679 * Return 0 means we want you to proceed with the abort non-zero 680 * means no abort processing. 681 */ 682 uint32_t new_vtag; 683 struct sctpasochead *head; 684 685 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 686 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 687 atomic_add_int(&stcb->asoc.refcnt, 1); 688 SCTP_TCB_UNLOCK(stcb); 689 SCTP_INP_INFO_WLOCK(); 690 SCTP_TCB_LOCK(stcb); 691 atomic_subtract_int(&stcb->asoc.refcnt, 1); 692 } else { 693 return (0); 694 } 695 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 696 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 697 /* generate a new vtag and send init */ 698 LIST_REMOVE(stcb, sctp_asocs); 699 stcb->asoc.my_vtag = new_vtag; 700 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 701 /* 702 * put it in the bucket in the vtag hash of assoc's for the 703 * system 704 */ 705 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 706 SCTP_INP_INFO_WUNLOCK(); 707 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 708 return (1); 709 } else { 710 /* 711 * treat like a case where the cookie expired i.e.: - dump 712 * current cookie. - generate a new vtag. - resend init. 713 */ 714 /* generate a new vtag and send init */ 715 LIST_REMOVE(stcb, sctp_asocs); 716 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 717 sctp_stop_all_cookie_timers(stcb); 718 sctp_toss_old_cookies(stcb, &stcb->asoc); 719 stcb->asoc.my_vtag = new_vtag; 720 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 721 /* 722 * put it in the bucket in the vtag hash of assoc's for the 723 * system 724 */ 725 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 726 SCTP_INP_INFO_WUNLOCK(); 727 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 728 return (1); 729 } 730 return (0); 731 } 732 733 static int 734 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 735 struct sctp_nets *net) 736 { 737 /* 738 * return 0 means we want you to proceed with the abort non-zero 739 * means no abort processing 740 */ 741 if (stcb->asoc.auth_supported == 0) { 742 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 743 return (0); 744 } 745 sctp_asconf_send_nat_state_update(stcb, net); 746 return (1); 747 } 748 749 /* Returns 1 if the stcb was aborted, 0 otherwise */ 750 static int 751 sctp_handle_abort(struct sctp_abort_chunk *abort, 752 struct sctp_tcb *stcb, struct sctp_nets *net) 753 { 754 uint16_t len; 755 uint16_t error; 756 757 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 758 if (stcb == NULL) 759 return (0); 760 761 len = ntohs(abort->ch.chunk_length); 762 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 763 /* 764 * Need to check the cause codes for our two magic nat 765 * aborts which don't kill the assoc necessarily. 766 */ 767 struct sctp_error_cause *cause; 768 769 cause = (struct sctp_error_cause *)(abort + 1); 770 error = ntohs(cause->code); 771 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 772 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 773 abort->ch.chunk_flags); 774 if (sctp_handle_nat_colliding_state(stcb)) { 775 return (0); 776 } 777 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 778 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 779 abort->ch.chunk_flags); 780 if (sctp_handle_nat_missing_state(stcb, net)) { 781 return (0); 782 } 783 } 784 } else { 785 error = 0; 786 } 787 /* stop any receive timers */ 788 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 789 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 790 /* notify user of the abort and clean up... */ 791 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 792 /* free the tcb */ 793 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 794 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 795 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 796 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 797 } 798 #ifdef SCTP_ASOCLOG_OF_TSNS 799 sctp_print_out_track_log(stcb); 800 #endif 801 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 802 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 803 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 804 return (1); 805 } 806 807 static void 808 sctp_start_net_timers(struct sctp_tcb *stcb) 809 { 810 uint32_t cnt_hb_sent; 811 struct sctp_nets *net; 812 813 cnt_hb_sent = 0; 814 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 815 /* 816 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 817 * If the dest in unconfirmed send a hb as well if under 818 * max_hb_burst have been sent. 819 */ 820 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 821 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 822 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 823 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 824 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 825 cnt_hb_sent++; 826 } 827 } 828 if (cnt_hb_sent) { 829 sctp_chunk_output(stcb->sctp_ep, stcb, 830 SCTP_OUTPUT_FROM_COOKIE_ACK, 831 SCTP_SO_NOT_LOCKED); 832 } 833 } 834 835 static void 836 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 837 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 838 { 839 struct sctp_association *asoc; 840 int some_on_streamwheel; 841 int old_state; 842 843 SCTPDBG(SCTP_DEBUG_INPUT2, 844 "sctp_handle_shutdown: handling SHUTDOWN\n"); 845 if (stcb == NULL) 846 return; 847 asoc = &stcb->asoc; 848 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 849 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 850 return; 851 } 852 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 853 /* Shutdown NOT the expected size */ 854 return; 855 } 856 old_state = SCTP_GET_STATE(stcb); 857 sctp_update_acked(stcb, cp, abort_flag); 858 if (*abort_flag) { 859 return; 860 } 861 if (asoc->control_pdapi) { 862 /* 863 * With a normal shutdown we assume the end of last record. 864 */ 865 SCTP_INP_READ_LOCK(stcb->sctp_ep); 866 if (asoc->control_pdapi->on_strm_q) { 867 struct sctp_stream_in *strm; 868 869 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 870 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 871 /* Unordered */ 872 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 873 asoc->control_pdapi->on_strm_q = 0; 874 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 875 /* Ordered */ 876 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 877 asoc->control_pdapi->on_strm_q = 0; 878 #ifdef INVARIANTS 879 } else { 880 panic("Unknown state on ctrl:%p on_strm_q:%d", 881 asoc->control_pdapi, 882 asoc->control_pdapi->on_strm_q); 883 #endif 884 } 885 } 886 asoc->control_pdapi->end_added = 1; 887 asoc->control_pdapi->pdapi_aborted = 1; 888 asoc->control_pdapi = NULL; 889 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 890 if (stcb->sctp_socket) { 891 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 892 } 893 } 894 /* goto SHUTDOWN_RECEIVED state to block new requests */ 895 if (stcb->sctp_socket) { 896 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 897 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 898 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 899 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 900 /* 901 * notify upper layer that peer has initiated a 902 * shutdown 903 */ 904 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 905 906 /* reset time */ 907 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 908 } 909 } 910 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 911 /* 912 * stop the shutdown timer, since we WILL move to 913 * SHUTDOWN-ACK-SENT. 914 */ 915 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 916 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 917 } 918 /* Now is there unsent data on a stream somewhere? */ 919 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 920 921 if (!TAILQ_EMPTY(&asoc->send_queue) || 922 !TAILQ_EMPTY(&asoc->sent_queue) || 923 some_on_streamwheel) { 924 /* By returning we will push more data out */ 925 return; 926 } else { 927 /* no outstanding data to send, so move on... */ 928 /* send SHUTDOWN-ACK */ 929 /* move to SHUTDOWN-ACK-SENT state */ 930 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 931 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 932 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 933 } 934 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 935 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 936 sctp_stop_timers_for_shutdown(stcb); 937 sctp_send_shutdown_ack(stcb, net); 938 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 939 stcb->sctp_ep, stcb, net); 940 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 941 sctp_send_shutdown_ack(stcb, net); 942 } 943 } 944 } 945 946 static void 947 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 948 struct sctp_tcb *stcb, 949 struct sctp_nets *net) 950 { 951 struct sctp_association *asoc; 952 953 SCTPDBG(SCTP_DEBUG_INPUT2, 954 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 955 if (stcb == NULL) 956 return; 957 958 asoc = &stcb->asoc; 959 /* process according to association state */ 960 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 961 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 962 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 963 sctp_send_shutdown_complete(stcb, net, 1); 964 SCTP_TCB_UNLOCK(stcb); 965 return; 966 } 967 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 968 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 969 /* unexpected SHUTDOWN-ACK... so ignore... */ 970 SCTP_TCB_UNLOCK(stcb); 971 return; 972 } 973 if (asoc->control_pdapi) { 974 /* 975 * With a normal shutdown we assume the end of last record. 976 */ 977 SCTP_INP_READ_LOCK(stcb->sctp_ep); 978 asoc->control_pdapi->end_added = 1; 979 asoc->control_pdapi->pdapi_aborted = 1; 980 asoc->control_pdapi = NULL; 981 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 982 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 983 } 984 #ifdef INVARIANTS 985 if (!TAILQ_EMPTY(&asoc->send_queue) || 986 !TAILQ_EMPTY(&asoc->sent_queue) || 987 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 988 panic("Queues are not empty when handling SHUTDOWN-ACK"); 989 } 990 #endif 991 /* stop the timer */ 992 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 993 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 994 /* send SHUTDOWN-COMPLETE */ 995 sctp_send_shutdown_complete(stcb, net, 0); 996 /* notify upper layer protocol */ 997 if (stcb->sctp_socket) { 998 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 999 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1000 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 1001 } 1002 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1003 } 1004 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1005 /* free the TCB but first save off the ep */ 1006 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1007 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1008 } 1009 1010 static void 1011 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1012 { 1013 switch (chunk_type) { 1014 case SCTP_ASCONF_ACK: 1015 case SCTP_ASCONF: 1016 sctp_asconf_cleanup(stcb); 1017 break; 1018 case SCTP_IFORWARD_CUM_TSN: 1019 case SCTP_FORWARD_CUM_TSN: 1020 stcb->asoc.prsctp_supported = 0; 1021 break; 1022 default: 1023 SCTPDBG(SCTP_DEBUG_INPUT2, 1024 "Peer does not support chunk type %d (0x%x).\n", 1025 chunk_type, chunk_type); 1026 break; 1027 } 1028 } 1029 1030 /* 1031 * Skip past the param header and then we will find the param that caused the 1032 * problem. There are a number of param's in a ASCONF OR the prsctp param 1033 * these will turn of specific features. 1034 * XXX: Is this the right thing to do? 1035 */ 1036 static void 1037 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1038 { 1039 switch (parameter_type) { 1040 /* pr-sctp draft */ 1041 case SCTP_PRSCTP_SUPPORTED: 1042 stcb->asoc.prsctp_supported = 0; 1043 break; 1044 case SCTP_SUPPORTED_CHUNK_EXT: 1045 break; 1046 /* draft-ietf-tsvwg-addip-sctp */ 1047 case SCTP_HAS_NAT_SUPPORT: 1048 stcb->asoc.peer_supports_nat = 0; 1049 break; 1050 case SCTP_ADD_IP_ADDRESS: 1051 case SCTP_DEL_IP_ADDRESS: 1052 case SCTP_SET_PRIM_ADDR: 1053 stcb->asoc.asconf_supported = 0; 1054 break; 1055 case SCTP_SUCCESS_REPORT: 1056 case SCTP_ERROR_CAUSE_IND: 1057 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1058 SCTPDBG(SCTP_DEBUG_INPUT2, 1059 "Turning off ASCONF to this strange peer\n"); 1060 stcb->asoc.asconf_supported = 0; 1061 break; 1062 default: 1063 SCTPDBG(SCTP_DEBUG_INPUT2, 1064 "Peer does not support param type %d (0x%x)??\n", 1065 parameter_type, parameter_type); 1066 break; 1067 } 1068 } 1069 1070 static int 1071 sctp_handle_error(struct sctp_chunkhdr *ch, 1072 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1073 { 1074 struct sctp_error_cause *cause; 1075 struct sctp_association *asoc; 1076 uint32_t remaining_length, adjust; 1077 uint16_t code, cause_code, cause_length; 1078 1079 /* parse through all of the errors and process */ 1080 asoc = &stcb->asoc; 1081 cause = (struct sctp_error_cause *)((caddr_t)ch + 1082 sizeof(struct sctp_chunkhdr)); 1083 remaining_length = ntohs(ch->chunk_length); 1084 if (remaining_length > limit) { 1085 remaining_length = limit; 1086 } 1087 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1088 remaining_length -= sizeof(struct sctp_chunkhdr); 1089 } else { 1090 remaining_length = 0; 1091 } 1092 code = 0; 1093 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1094 /* Process an Error Cause */ 1095 cause_code = ntohs(cause->code); 1096 cause_length = ntohs(cause->length); 1097 if ((cause_length > remaining_length) || (cause_length == 0)) { 1098 /* Invalid cause length, possibly due to truncation. */ 1099 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1100 remaining_length, cause_length); 1101 return (0); 1102 } 1103 if (code == 0) { 1104 /* report the first error cause */ 1105 code = cause_code; 1106 } 1107 switch (cause_code) { 1108 case SCTP_CAUSE_INVALID_STREAM: 1109 case SCTP_CAUSE_MISSING_PARAM: 1110 case SCTP_CAUSE_INVALID_PARAM: 1111 case SCTP_CAUSE_NO_USER_DATA: 1112 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1113 cause_code); 1114 break; 1115 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1116 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1117 ch->chunk_flags); 1118 if (sctp_handle_nat_colliding_state(stcb)) { 1119 return (0); 1120 } 1121 break; 1122 case SCTP_CAUSE_NAT_MISSING_STATE: 1123 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1124 ch->chunk_flags); 1125 if (sctp_handle_nat_missing_state(stcb, net)) { 1126 return (0); 1127 } 1128 break; 1129 case SCTP_CAUSE_STALE_COOKIE: 1130 /* 1131 * We only act if we have echoed a cookie and are 1132 * waiting. 1133 */ 1134 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1135 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1136 struct timeval now; 1137 struct sctp_error_stale_cookie *stale_cookie; 1138 uint64_t stale_time; 1139 1140 asoc->stale_cookie_count++; 1141 if (asoc->stale_cookie_count > asoc->max_init_times) { 1142 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1143 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1145 return (-1); 1146 } 1147 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1148 stale_time = ntohl(stale_cookie->stale_time); 1149 if (stale_time == 0) { 1150 /* Use an RTT as an approximation. */ 1151 (void)SCTP_GETTIME_TIMEVAL(&now); 1152 timevalsub(&now, &asoc->time_entered); 1153 stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec; 1154 if (stale_time == 0) { 1155 stale_time = 1; 1156 } 1157 } 1158 /* 1159 * stale_time is in usec, convert it to 1160 * msec. Round upwards, to ensure that it is 1161 * non-zero. 1162 */ 1163 stale_time = (stale_time + 999) / 1000; 1164 /* Double it, to be more robust on RTX. */ 1165 stale_time = 2 * stale_time; 1166 asoc->cookie_preserve_req = (uint32_t)stale_time; 1167 if (asoc->overall_error_count == 0) { 1168 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 1169 SCTP_RTT_FROM_NON_DATA); 1170 } 1171 asoc->overall_error_count = 0; 1172 /* Blast back to INIT state */ 1173 sctp_toss_old_cookies(stcb, &stcb->asoc); 1174 sctp_stop_all_cookie_timers(stcb); 1175 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1176 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 1177 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1178 } 1179 break; 1180 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1181 /* 1182 * Nothing we can do here, we don't do hostname 1183 * addresses so if the peer does not like my IPv6 1184 * (or IPv4 for that matter) it does not matter. If 1185 * they don't support that type of address, they can 1186 * NOT possibly get that packet type... i.e. with no 1187 * IPv6 you can't receive a IPv6 packet. so we can 1188 * safely ignore this one. If we ever added support 1189 * for HOSTNAME Addresses, then we would need to do 1190 * something here. 1191 */ 1192 break; 1193 case SCTP_CAUSE_UNRECOG_CHUNK: 1194 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1195 struct sctp_error_unrecognized_chunk *unrec_chunk; 1196 1197 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1198 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1199 } 1200 break; 1201 case SCTP_CAUSE_UNRECOG_PARAM: 1202 /* XXX: We only consider the first parameter */ 1203 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1204 struct sctp_paramhdr *unrec_parameter; 1205 1206 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1207 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1208 } 1209 break; 1210 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1211 /* 1212 * We ignore this since the timer will drive out a 1213 * new cookie anyway and there timer will drive us 1214 * to send a SHUTDOWN_COMPLETE. We can't send one 1215 * here since we don't have their tag. 1216 */ 1217 break; 1218 case SCTP_CAUSE_DELETING_LAST_ADDR: 1219 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1220 case SCTP_CAUSE_DELETING_SRC_ADDR: 1221 /* 1222 * We should NOT get these here, but in a 1223 * ASCONF-ACK. 1224 */ 1225 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1226 cause_code); 1227 break; 1228 case SCTP_CAUSE_OUT_OF_RESC: 1229 /* 1230 * And what, pray tell do we do with the fact that 1231 * the peer is out of resources? Not really sure we 1232 * could do anything but abort. I suspect this 1233 * should have came WITH an abort instead of in a 1234 * OP-ERROR. 1235 */ 1236 break; 1237 default: 1238 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1239 cause_code); 1240 break; 1241 } 1242 adjust = SCTP_SIZE32(cause_length); 1243 if (remaining_length >= adjust) { 1244 remaining_length -= adjust; 1245 } else { 1246 remaining_length = 0; 1247 } 1248 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1249 } 1250 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1251 return (0); 1252 } 1253 1254 static int 1255 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1256 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1257 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1258 struct sctp_nets *net, int *abort_no_unlock, 1259 uint8_t mflowtype, uint32_t mflowid, 1260 uint32_t vrf_id) 1261 { 1262 struct sctp_init_ack *init_ack; 1263 struct mbuf *op_err; 1264 1265 SCTPDBG(SCTP_DEBUG_INPUT2, 1266 "sctp_handle_init_ack: handling INIT-ACK\n"); 1267 1268 if (stcb == NULL) { 1269 SCTPDBG(SCTP_DEBUG_INPUT2, 1270 "sctp_handle_init_ack: TCB is null\n"); 1271 return (-1); 1272 } 1273 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1274 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1275 init_ack = &cp->init; 1276 /* Validate parameters. */ 1277 if ((ntohl(init_ack->initiate_tag) == 0) || 1278 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1279 (ntohs(init_ack->num_inbound_streams) == 0) || 1280 (ntohs(init_ack->num_outbound_streams) == 0)) { 1281 /* One of the mandatory parameters is illegal. */ 1282 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1283 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1284 src, dst, sh, op_err, 1285 mflowtype, mflowid, 1286 vrf_id, net->port); 1287 *abort_no_unlock = 1; 1288 return (-1); 1289 } 1290 if (stcb->asoc.primary_destination->dest_state & 1291 SCTP_ADDR_UNCONFIRMED) { 1292 /* 1293 * The primary is where we sent the INIT, we can 1294 * always consider it confirmed when the INIT-ACK is 1295 * returned. Do this before we load addresses 1296 * though. 1297 */ 1298 stcb->asoc.primary_destination->dest_state &= 1299 ~SCTP_ADDR_UNCONFIRMED; 1300 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1301 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1302 } 1303 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1304 net, abort_no_unlock, 1305 mflowtype, mflowid, 1306 vrf_id) < 0) { 1307 /* error in parsing parameters */ 1308 return (-1); 1309 } 1310 /* Update our state. */ 1311 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1312 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1313 1314 /* Reset the RTO calculation. */ 1315 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1316 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1317 stcb->asoc.overall_error_count, 1318 0, 1319 SCTP_FROM_SCTP_INPUT, 1320 __LINE__); 1321 } 1322 stcb->asoc.overall_error_count = 0; 1323 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1324 /* 1325 * Collapse the init timer back in case of a exponential 1326 * backoff. 1327 */ 1328 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1329 stcb, net); 1330 /* 1331 * The output routine at the end of the inbound data 1332 * processing will cause the cookie to be sent. 1333 */ 1334 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1335 return (0); 1336 } else { 1337 return (-1); 1338 } 1339 } 1340 1341 static struct sctp_tcb * 1342 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1343 struct sockaddr *src, struct sockaddr *dst, 1344 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1345 struct sctp_inpcb *inp, struct sctp_nets **netp, 1346 struct sockaddr *init_src, int *notification, 1347 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1348 uint8_t mflowtype, uint32_t mflowid, 1349 uint32_t vrf_id, uint16_t port); 1350 1351 /* 1352 * handle a state cookie for an existing association m: input packet mbuf 1353 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1354 * "split" mbuf and the cookie signature does not exist offset: offset into 1355 * mbuf to the cookie-echo chunk 1356 */ 1357 static struct sctp_tcb * 1358 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1359 struct sockaddr *src, struct sockaddr *dst, 1360 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1361 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1362 struct sockaddr *init_src, int *notification, 1363 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1364 uint8_t mflowtype, uint32_t mflowid, 1365 uint32_t vrf_id, uint16_t port) 1366 { 1367 struct sctp_association *asoc; 1368 struct sctp_init_chunk *init_cp, init_buf; 1369 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1370 struct sctp_asconf_addr *aparam, *naparam; 1371 struct sctp_asconf_ack *aack, *naack; 1372 struct sctp_tmit_chunk *chk, *nchk; 1373 struct sctp_stream_reset_list *strrst, *nstrrst; 1374 struct sctp_queued_to_read *sq, *nsq; 1375 struct sctp_nets *net; 1376 struct mbuf *op_err; 1377 int init_offset, initack_offset, i; 1378 int retval; 1379 int spec_flag = 0; 1380 uint32_t how_indx; 1381 #if defined(SCTP_DETAILED_STR_STATS) 1382 int j; 1383 #endif 1384 1385 net = *netp; 1386 /* I know that the TCB is non-NULL from the caller */ 1387 asoc = &stcb->asoc; 1388 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1389 if (asoc->cookie_how[how_indx] == 0) 1390 break; 1391 } 1392 if (how_indx < sizeof(asoc->cookie_how)) { 1393 asoc->cookie_how[how_indx] = 1; 1394 } 1395 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1396 /* SHUTDOWN came in after sending INIT-ACK */ 1397 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1398 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1399 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1400 mflowtype, mflowid, inp->fibnum, 1401 vrf_id, net->port); 1402 if (how_indx < sizeof(asoc->cookie_how)) 1403 asoc->cookie_how[how_indx] = 2; 1404 SCTP_TCB_UNLOCK(stcb); 1405 return (NULL); 1406 } 1407 /* 1408 * find and validate the INIT chunk in the cookie (peer's info) the 1409 * INIT should start after the cookie-echo header struct (chunk 1410 * header, state cookie header struct) 1411 */ 1412 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1413 1414 init_cp = (struct sctp_init_chunk *) 1415 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1416 (uint8_t *)&init_buf); 1417 if (init_cp == NULL) { 1418 /* could not pull a INIT chunk in cookie */ 1419 SCTP_TCB_UNLOCK(stcb); 1420 return (NULL); 1421 } 1422 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1423 SCTP_TCB_UNLOCK(stcb); 1424 return (NULL); 1425 } 1426 /* 1427 * find and validate the INIT-ACK chunk in the cookie (my info) the 1428 * INIT-ACK follows the INIT chunk 1429 */ 1430 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1431 initack_cp = (struct sctp_init_ack_chunk *) 1432 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1433 (uint8_t *)&initack_buf); 1434 if (initack_cp == NULL) { 1435 /* could not pull INIT-ACK chunk in cookie */ 1436 SCTP_TCB_UNLOCK(stcb); 1437 return (NULL); 1438 } 1439 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1440 SCTP_TCB_UNLOCK(stcb); 1441 return (NULL); 1442 } 1443 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1444 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1445 /* 1446 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1447 * to get into the OPEN state 1448 */ 1449 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1450 /*- 1451 * Opps, this means that we somehow generated two vtag's 1452 * the same. I.e. we did: 1453 * Us Peer 1454 * <---INIT(tag=a)------ 1455 * ----INIT-ACK(tag=t)--> 1456 * ----INIT(tag=t)------> *1 1457 * <---INIT-ACK(tag=a)--- 1458 * <----CE(tag=t)------------- *2 1459 * 1460 * At point *1 we should be generating a different 1461 * tag t'. Which means we would throw away the CE and send 1462 * ours instead. Basically this is case C (throw away side). 1463 */ 1464 if (how_indx < sizeof(asoc->cookie_how)) 1465 asoc->cookie_how[how_indx] = 17; 1466 SCTP_TCB_UNLOCK(stcb); 1467 return (NULL); 1468 } 1469 switch (SCTP_GET_STATE(stcb)) { 1470 case SCTP_STATE_COOKIE_WAIT: 1471 case SCTP_STATE_COOKIE_ECHOED: 1472 /* 1473 * INIT was sent but got a COOKIE_ECHO with the 1474 * correct tags... just accept it...but we must 1475 * process the init so that we can make sure we have 1476 * the right seq no's. 1477 */ 1478 /* First we must process the INIT !! */ 1479 if (sctp_process_init(init_cp, stcb) < 0) { 1480 if (how_indx < sizeof(asoc->cookie_how)) 1481 asoc->cookie_how[how_indx] = 3; 1482 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1483 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1484 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1485 src, dst, sh, op_err, 1486 mflowtype, mflowid, 1487 vrf_id, net->port); 1488 return (NULL); 1489 } 1490 /* we have already processed the INIT so no problem */ 1491 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1492 stcb, net, 1493 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1494 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1495 stcb, net, 1496 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1497 /* update current state */ 1498 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1499 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1500 else 1501 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1502 1503 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1504 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1505 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1506 stcb->sctp_ep, stcb, NULL); 1507 } 1508 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1509 sctp_stop_all_cookie_timers(stcb); 1510 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1511 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1512 (!SCTP_IS_LISTENING(inp))) { 1513 /* 1514 * Here is where collision would go if we 1515 * did a connect() and instead got a 1516 * init/init-ack/cookie done before the 1517 * init-ack came back.. 1518 */ 1519 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1520 soisconnected(stcb->sctp_socket); 1521 } 1522 /* notify upper layer */ 1523 *notification = SCTP_NOTIFY_ASSOC_UP; 1524 net->hb_responded = 1; 1525 if (stcb->asoc.sctp_autoclose_ticks && 1526 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1527 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1528 inp, stcb, NULL); 1529 } 1530 break; 1531 default: 1532 /* 1533 * we're in the OPEN state (or beyond), so peer must 1534 * have simply lost the COOKIE-ACK 1535 */ 1536 break; 1537 } /* end switch */ 1538 sctp_stop_all_cookie_timers(stcb); 1539 if ((retval = sctp_load_addresses_from_init(stcb, m, 1540 init_offset + sizeof(struct sctp_init_chunk), 1541 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1542 if (how_indx < sizeof(asoc->cookie_how)) 1543 asoc->cookie_how[how_indx] = 4; 1544 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1545 "Problem with address parameters"); 1546 SCTPDBG(SCTP_DEBUG_INPUT1, 1547 "Load addresses from INIT causes an abort %d\n", 1548 retval); 1549 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1550 src, dst, sh, op_err, 1551 mflowtype, mflowid, 1552 vrf_id, net->port); 1553 return (NULL); 1554 } 1555 /* respond with a COOKIE-ACK */ 1556 sctp_toss_old_cookies(stcb, asoc); 1557 sctp_send_cookie_ack(stcb); 1558 if (how_indx < sizeof(asoc->cookie_how)) 1559 asoc->cookie_how[how_indx] = 5; 1560 return (stcb); 1561 } 1562 1563 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1564 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1565 cookie->tie_tag_my_vtag == 0 && 1566 cookie->tie_tag_peer_vtag == 0) { 1567 /* 1568 * case C in Section 5.2.4 Table 2: XMOO silently discard 1569 */ 1570 if (how_indx < sizeof(asoc->cookie_how)) 1571 asoc->cookie_how[how_indx] = 6; 1572 SCTP_TCB_UNLOCK(stcb); 1573 return (NULL); 1574 } 1575 /* 1576 * If nat support, and the below and stcb is established, send back 1577 * a ABORT(colliding state) if we are established. 1578 */ 1579 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1580 (asoc->peer_supports_nat) && 1581 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1582 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1583 (asoc->peer_vtag == 0)))) { 1584 /* 1585 * Special case - Peer's support nat. We may have two init's 1586 * that we gave out the same tag on since one was not 1587 * established.. i.e. we get INIT from host-1 behind the nat 1588 * and we respond tag-a, we get a INIT from host-2 behind 1589 * the nat and we get tag-a again. Then we bring up host-1 1590 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1591 * Now we have colliding state. We must send an abort here 1592 * with colliding state indication. 1593 */ 1594 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1595 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1596 mflowtype, mflowid, inp->fibnum, 1597 vrf_id, port); 1598 SCTP_TCB_UNLOCK(stcb); 1599 return (NULL); 1600 } 1601 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1602 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1603 (asoc->peer_vtag == 0))) { 1604 /* 1605 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1606 * should be ok, re-accept peer info 1607 */ 1608 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1609 /* 1610 * Extension of case C. If we hit this, then the 1611 * random number generator returned the same vtag 1612 * when we first sent our INIT-ACK and when we later 1613 * sent our INIT. The side with the seq numbers that 1614 * are different will be the one that normally would 1615 * have hit case C. This in effect "extends" our 1616 * vtags in this collision case to be 64 bits. The 1617 * same collision could occur aka you get both vtag 1618 * and seq number the same twice in a row.. but is 1619 * much less likely. If it did happen then we would 1620 * proceed through and bring up the assoc.. we may 1621 * end up with the wrong stream setup however.. 1622 * which would be bad.. but there is no way to 1623 * tell.. until we send on a stream that does not 1624 * exist :-) 1625 */ 1626 if (how_indx < sizeof(asoc->cookie_how)) 1627 asoc->cookie_how[how_indx] = 7; 1628 1629 SCTP_TCB_UNLOCK(stcb); 1630 return (NULL); 1631 } 1632 if (how_indx < sizeof(asoc->cookie_how)) 1633 asoc->cookie_how[how_indx] = 8; 1634 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1635 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1636 sctp_stop_all_cookie_timers(stcb); 1637 /* 1638 * since we did not send a HB make sure we don't double 1639 * things 1640 */ 1641 net->hb_responded = 1; 1642 if (stcb->asoc.sctp_autoclose_ticks && 1643 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1644 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1645 NULL); 1646 } 1647 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1648 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1649 asoc->pre_open_streams = asoc->streamoutcnt; 1650 } 1651 1652 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1653 /* 1654 * Ok the peer probably discarded our data (if we 1655 * echoed a cookie+data). So anything on the 1656 * sent_queue should be marked for retransmit, we 1657 * may not get something to kick us so it COULD 1658 * still take a timeout to move these.. but it can't 1659 * hurt to mark them. 1660 */ 1661 1662 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1663 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1664 chk->sent = SCTP_DATAGRAM_RESEND; 1665 sctp_flight_size_decrease(chk); 1666 sctp_total_flight_decrease(stcb, chk); 1667 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1668 spec_flag++; 1669 } 1670 } 1671 } 1672 /* process the INIT info (peer's info) */ 1673 if (sctp_process_init(init_cp, stcb) < 0) { 1674 if (how_indx < sizeof(asoc->cookie_how)) 1675 asoc->cookie_how[how_indx] = 9; 1676 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1677 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1678 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1679 src, dst, sh, op_err, 1680 mflowtype, mflowid, 1681 vrf_id, net->port); 1682 return (NULL); 1683 } 1684 if ((retval = sctp_load_addresses_from_init(stcb, m, 1685 init_offset + sizeof(struct sctp_init_chunk), 1686 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1687 if (how_indx < sizeof(asoc->cookie_how)) 1688 asoc->cookie_how[how_indx] = 10; 1689 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1690 "Problem with address parameters"); 1691 SCTPDBG(SCTP_DEBUG_INPUT1, 1692 "Load addresses from INIT causes an abort %d\n", 1693 retval); 1694 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1695 src, dst, sh, op_err, 1696 mflowtype, mflowid, 1697 vrf_id, net->port); 1698 return (NULL); 1699 } 1700 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1701 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1702 *notification = SCTP_NOTIFY_ASSOC_UP; 1703 1704 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1705 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1706 (!SCTP_IS_LISTENING(inp))) { 1707 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1708 soisconnected(stcb->sctp_socket); 1709 } 1710 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1711 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1712 else 1713 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1714 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1715 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1716 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1717 } else { 1718 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1719 } 1720 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1721 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1722 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1723 stcb->sctp_ep, stcb, NULL); 1724 } 1725 sctp_stop_all_cookie_timers(stcb); 1726 sctp_toss_old_cookies(stcb, asoc); 1727 sctp_send_cookie_ack(stcb); 1728 if (spec_flag) { 1729 /* 1730 * only if we have retrans set do we do this. What 1731 * this call does is get only the COOKIE-ACK out and 1732 * then when we return the normal call to 1733 * sctp_chunk_output will get the retrans out behind 1734 * this. 1735 */ 1736 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1737 } 1738 if (how_indx < sizeof(asoc->cookie_how)) 1739 asoc->cookie_how[how_indx] = 11; 1740 1741 return (stcb); 1742 } 1743 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1744 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1745 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1746 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1747 cookie->tie_tag_peer_vtag != 0) { 1748 struct sctpasochead *head; 1749 1750 if (asoc->peer_supports_nat) { 1751 struct sctp_tcb *local_stcb; 1752 1753 /* 1754 * This is a gross gross hack. Just call the 1755 * cookie_new code since we are allowing a duplicate 1756 * association. I hope this works... 1757 */ 1758 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1759 sh, cookie, cookie_len, 1760 inp, netp, init_src, notification, 1761 auth_skipped, auth_offset, auth_len, 1762 mflowtype, mflowid, 1763 vrf_id, port); 1764 if (local_stcb == NULL) { 1765 SCTP_TCB_UNLOCK(stcb); 1766 } 1767 return (local_stcb); 1768 } 1769 /* 1770 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1771 */ 1772 /* temp code */ 1773 if (how_indx < sizeof(asoc->cookie_how)) 1774 asoc->cookie_how[how_indx] = 12; 1775 sctp_stop_association_timers(stcb, false); 1776 /* notify upper layer */ 1777 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1778 atomic_add_int(&stcb->asoc.refcnt, 1); 1779 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1780 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1781 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1782 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1783 } 1784 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1785 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1786 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1787 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1788 } 1789 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1790 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1791 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1792 stcb->sctp_ep, stcb, NULL); 1793 1794 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1795 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1796 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1797 } 1798 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1799 asoc->pre_open_streams = asoc->streamoutcnt; 1800 } 1801 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1802 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1803 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1804 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1805 asoc->str_reset_seq_in = asoc->init_seq_number; 1806 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1807 asoc->send_sack = 1; 1808 asoc->data_pkts_seen = 0; 1809 asoc->last_data_chunk_from = NULL; 1810 asoc->last_control_chunk_from = NULL; 1811 asoc->last_net_cmt_send_started = NULL; 1812 if (asoc->mapping_array) { 1813 memset(asoc->mapping_array, 0, 1814 asoc->mapping_array_size); 1815 } 1816 if (asoc->nr_mapping_array) { 1817 memset(asoc->nr_mapping_array, 0, 1818 asoc->mapping_array_size); 1819 } 1820 SCTP_TCB_UNLOCK(stcb); 1821 SCTP_INP_INFO_WLOCK(); 1822 SCTP_INP_WLOCK(stcb->sctp_ep); 1823 SCTP_TCB_LOCK(stcb); 1824 atomic_subtract_int(&stcb->asoc.refcnt, 1); 1825 /* send up all the data */ 1826 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1827 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1828 stcb->asoc.strmout[i].chunks_on_queues = 0; 1829 #if defined(SCTP_DETAILED_STR_STATS) 1830 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1831 asoc->strmout[i].abandoned_sent[j] = 0; 1832 asoc->strmout[i].abandoned_unsent[j] = 0; 1833 } 1834 #else 1835 asoc->strmout[i].abandoned_sent[0] = 0; 1836 asoc->strmout[i].abandoned_unsent[0] = 0; 1837 #endif 1838 stcb->asoc.strmout[i].next_mid_ordered = 0; 1839 stcb->asoc.strmout[i].next_mid_unordered = 0; 1840 stcb->asoc.strmout[i].sid = i; 1841 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1842 } 1843 TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) { 1844 TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp); 1845 SCTP_FREE(strrst, SCTP_M_STRESET); 1846 } 1847 TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) { 1848 TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next); 1849 if (sq->data) { 1850 sctp_m_freem(sq->data); 1851 sq->data = NULL; 1852 } 1853 sctp_free_remote_addr(sq->whoFrom); 1854 sq->whoFrom = NULL; 1855 sq->stcb = NULL; 1856 sctp_free_a_readq(stcb, sq); 1857 } 1858 TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) { 1859 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 1860 if (chk->data) { 1861 sctp_m_freem(chk->data); 1862 chk->data = NULL; 1863 } 1864 if (chk->holds_key_ref) 1865 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1866 sctp_free_remote_addr(chk->whoTo); 1867 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1868 SCTP_DECR_CHK_COUNT(); 1869 } 1870 asoc->ctrl_queue_cnt = 0; 1871 asoc->str_reset = NULL; 1872 asoc->stream_reset_outstanding = 0; 1873 TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) { 1874 TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next); 1875 if (chk->data) { 1876 sctp_m_freem(chk->data); 1877 chk->data = NULL; 1878 } 1879 if (chk->holds_key_ref) 1880 sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED); 1881 sctp_free_remote_addr(chk->whoTo); 1882 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk); 1883 SCTP_DECR_CHK_COUNT(); 1884 } 1885 TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) { 1886 TAILQ_REMOVE(&asoc->asconf_queue, aparam, next); 1887 SCTP_FREE(aparam, SCTP_M_ASC_ADDR); 1888 } 1889 TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) { 1890 TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next); 1891 if (aack->data != NULL) { 1892 sctp_m_freem(aack->data); 1893 } 1894 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack); 1895 } 1896 asoc->zero_checksum = cookie->zero_checksum; 1897 1898 /* process the INIT-ACK info (my info) */ 1899 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1900 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1901 1902 /* pull from vtag hash */ 1903 LIST_REMOVE(stcb, sctp_asocs); 1904 /* re-insert to new vtag position */ 1905 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1906 SCTP_BASE_INFO(hashasocmark))]; 1907 /* 1908 * put it in the bucket in the vtag hash of assoc's for the 1909 * system 1910 */ 1911 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1912 1913 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1914 SCTP_INP_INFO_WUNLOCK(); 1915 asoc->total_flight = 0; 1916 asoc->total_flight_count = 0; 1917 /* process the INIT info (peer's info) */ 1918 if (sctp_process_init(init_cp, stcb) < 0) { 1919 if (how_indx < sizeof(asoc->cookie_how)) 1920 asoc->cookie_how[how_indx] = 13; 1921 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1922 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1923 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1924 src, dst, sh, op_err, 1925 mflowtype, mflowid, 1926 vrf_id, net->port); 1927 return (NULL); 1928 } 1929 /* 1930 * since we did not send a HB make sure we don't double 1931 * things 1932 */ 1933 net->hb_responded = 1; 1934 1935 if ((retval = sctp_load_addresses_from_init(stcb, m, 1936 init_offset + sizeof(struct sctp_init_chunk), 1937 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1938 if (how_indx < sizeof(asoc->cookie_how)) 1939 asoc->cookie_how[how_indx] = 14; 1940 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1941 "Problem with address parameters"); 1942 SCTPDBG(SCTP_DEBUG_INPUT1, 1943 "Load addresses from INIT causes an abort %d\n", 1944 retval); 1945 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1946 src, dst, sh, op_err, 1947 mflowtype, mflowid, 1948 vrf_id, net->port); 1949 return (NULL); 1950 } 1951 /* respond with a COOKIE-ACK */ 1952 sctp_send_cookie_ack(stcb); 1953 if (how_indx < sizeof(asoc->cookie_how)) 1954 asoc->cookie_how[how_indx] = 15; 1955 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) && 1956 (asoc->sctp_autoclose_ticks > 0)) { 1957 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 1958 } 1959 return (stcb); 1960 } 1961 if (how_indx < sizeof(asoc->cookie_how)) 1962 asoc->cookie_how[how_indx] = 16; 1963 /* all other cases... */ 1964 SCTP_TCB_UNLOCK(stcb); 1965 return (NULL); 1966 } 1967 1968 /* 1969 * handle a state cookie for a new association m: input packet mbuf chain-- 1970 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1971 * and the cookie signature does not exist offset: offset into mbuf to the 1972 * cookie-echo chunk length: length of the cookie chunk to: where the init 1973 * was from returns a new TCB 1974 */ 1975 static struct sctp_tcb * 1976 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1977 struct sockaddr *src, struct sockaddr *dst, 1978 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1979 struct sctp_inpcb *inp, struct sctp_nets **netp, 1980 struct sockaddr *init_src, int *notification, 1981 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1982 uint8_t mflowtype, uint32_t mflowid, 1983 uint32_t vrf_id, uint16_t port) 1984 { 1985 struct sctp_tcb *stcb; 1986 struct sctp_init_chunk *init_cp, init_buf; 1987 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1988 union sctp_sockstore store; 1989 struct sctp_association *asoc; 1990 int init_offset, initack_offset, initack_limit; 1991 int error = 0; 1992 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1993 1994 /* 1995 * find and validate the INIT chunk in the cookie (peer's info) the 1996 * INIT should start after the cookie-echo header struct (chunk 1997 * header, state cookie header struct) 1998 */ 1999 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 2000 init_cp = (struct sctp_init_chunk *) 2001 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 2002 (uint8_t *)&init_buf); 2003 if (init_cp == NULL) { 2004 /* could not pull a INIT chunk in cookie */ 2005 SCTPDBG(SCTP_DEBUG_INPUT1, 2006 "process_cookie_new: could not pull INIT chunk hdr\n"); 2007 return (NULL); 2008 } 2009 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 2010 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 2011 return (NULL); 2012 } 2013 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 2014 /* 2015 * find and validate the INIT-ACK chunk in the cookie (my info) the 2016 * INIT-ACK follows the INIT chunk 2017 */ 2018 initack_cp = (struct sctp_init_ack_chunk *) 2019 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 2020 (uint8_t *)&initack_buf); 2021 if (initack_cp == NULL) { 2022 /* could not pull INIT-ACK chunk in cookie */ 2023 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 2024 return (NULL); 2025 } 2026 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 2027 return (NULL); 2028 } 2029 /* 2030 * NOTE: We can't use the INIT_ACK's chk_length to determine the 2031 * "initack_limit" value. This is because the chk_length field 2032 * includes the length of the cookie, but the cookie is omitted when 2033 * the INIT and INIT_ACK are tacked onto the cookie... 2034 */ 2035 initack_limit = offset + cookie_len; 2036 2037 /* 2038 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2039 * and populate 2040 */ 2041 2042 /* 2043 * Here we do a trick, we set in NULL for the proc/thread argument. 2044 * We do this since in effect we only use the p argument when the 2045 * socket is unbound and we must do an implicit bind. Since we are 2046 * getting a cookie, we cannot be unbound. 2047 */ 2048 stcb = sctp_aloc_assoc(inp, init_src, &error, 2049 ntohl(initack_cp->init.initiate_tag), 2050 ntohl(initack_cp->init.initial_tsn), vrf_id, 2051 ntohs(initack_cp->init.num_outbound_streams), 2052 port, 2053 (struct thread *)NULL, 2054 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2055 if (stcb == NULL) { 2056 struct mbuf *op_err; 2057 2058 /* memory problem? */ 2059 SCTPDBG(SCTP_DEBUG_INPUT1, 2060 "process_cookie_new: no room for another TCB!\n"); 2061 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2062 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2063 src, dst, sh, op_err, 2064 mflowtype, mflowid, 2065 vrf_id, port); 2066 return (NULL); 2067 } 2068 asoc = &stcb->asoc; 2069 /* get scope variables out of cookie */ 2070 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2071 asoc->scope.site_scope = cookie->site_scope; 2072 asoc->scope.local_scope = cookie->local_scope; 2073 asoc->scope.loopback_scope = cookie->loopback_scope; 2074 2075 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2076 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2077 struct mbuf *op_err; 2078 2079 /* 2080 * Houston we have a problem. The EP changed while the 2081 * cookie was in flight. Only recourse is to abort the 2082 * association. 2083 */ 2084 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2085 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2086 src, dst, sh, op_err, 2087 mflowtype, mflowid, 2088 vrf_id, port); 2089 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2090 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2091 return (NULL); 2092 } 2093 asoc->zero_checksum = cookie->zero_checksum; 2094 /* process the INIT-ACK info (my info) */ 2095 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2096 2097 /* process the INIT info (peer's info) */ 2098 if (sctp_process_init(init_cp, stcb) < 0) { 2099 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2100 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2101 return (NULL); 2102 } 2103 /* load all addresses */ 2104 if (sctp_load_addresses_from_init(stcb, m, 2105 init_offset + sizeof(struct sctp_init_chunk), 2106 initack_offset, src, dst, init_src, port) < 0) { 2107 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2108 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2109 return (NULL); 2110 } 2111 /* 2112 * verify any preceding AUTH chunk that was skipped 2113 */ 2114 /* pull the local authentication parameters from the cookie/init-ack */ 2115 sctp_auth_get_cookie_params(stcb, m, 2116 initack_offset + sizeof(struct sctp_init_ack_chunk), 2117 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2118 if (auth_skipped) { 2119 struct sctp_auth_chunk *auth; 2120 2121 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2122 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2123 } else { 2124 auth = NULL; 2125 } 2126 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2127 /* auth HMAC failed, dump the assoc and packet */ 2128 SCTPDBG(SCTP_DEBUG_AUTH1, 2129 "COOKIE-ECHO: AUTH failed\n"); 2130 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2131 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2132 return (NULL); 2133 } else { 2134 /* remaining chunks checked... good to go */ 2135 stcb->asoc.authenticated = 1; 2136 } 2137 } 2138 2139 /* 2140 * if we're doing ASCONFs, check to see if we have any new local 2141 * addresses that need to get added to the peer (eg. addresses 2142 * changed while cookie echo in flight). This needs to be done 2143 * after we go to the OPEN state to do the correct asconf 2144 * processing. else, make sure we have the correct addresses in our 2145 * lists 2146 */ 2147 2148 /* warning, we re-use sin, sin6, sa_store here! */ 2149 /* pull in local_address (our "from" address) */ 2150 switch (cookie->laddr_type) { 2151 #ifdef INET 2152 case SCTP_IPV4_ADDRESS: 2153 /* source addr is IPv4 */ 2154 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2155 store.sin.sin_family = AF_INET; 2156 store.sin.sin_len = sizeof(struct sockaddr_in); 2157 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2158 break; 2159 #endif 2160 #ifdef INET6 2161 case SCTP_IPV6_ADDRESS: 2162 /* source addr is IPv6 */ 2163 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2164 store.sin6.sin6_family = AF_INET6; 2165 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2166 store.sin6.sin6_scope_id = cookie->scope_id; 2167 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2168 break; 2169 #endif 2170 default: 2171 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2172 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2173 return (NULL); 2174 } 2175 2176 /* update current state */ 2177 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2178 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2179 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2180 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2181 stcb->sctp_ep, stcb, NULL); 2182 } 2183 sctp_stop_all_cookie_timers(stcb); 2184 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2185 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2186 2187 /* set up to notify upper layer */ 2188 *notification = SCTP_NOTIFY_ASSOC_UP; 2189 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2190 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2191 (!SCTP_IS_LISTENING(inp))) { 2192 /* 2193 * This is an endpoint that called connect() how it got a 2194 * cookie that is NEW is a bit of a mystery. It must be that 2195 * the INIT was sent, but before it got there.. a complete 2196 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2197 * should have went to the other code.. not here.. oh well.. 2198 * a bit of protection is worth having.. 2199 * 2200 * XXXMJ unlocked 2201 */ 2202 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2203 soisconnected(stcb->sctp_socket); 2204 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2205 (SCTP_IS_LISTENING(inp))) { 2206 /* 2207 * We don't want to do anything with this one. Since it is 2208 * the listening guy. The timer will get started for 2209 * accepted connections in the caller. 2210 */ 2211 ; 2212 } 2213 if (stcb->asoc.sctp_autoclose_ticks && 2214 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2215 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2216 } 2217 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2218 *netp = sctp_findnet(stcb, init_src); 2219 if (*netp != NULL) { 2220 /* 2221 * Since we did not send a HB, make sure we don't double 2222 * things. 2223 */ 2224 (*netp)->hb_responded = 1; 2225 } 2226 /* respond with a COOKIE-ACK */ 2227 sctp_send_cookie_ack(stcb); 2228 2229 /* 2230 * check the address lists for any ASCONFs that need to be sent 2231 * AFTER the cookie-ack is sent 2232 */ 2233 sctp_check_address_list(stcb, m, 2234 initack_offset + sizeof(struct sctp_init_ack_chunk), 2235 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2236 &store.sa, cookie->local_scope, cookie->site_scope, 2237 cookie->ipv4_scope, cookie->loopback_scope); 2238 2239 return (stcb); 2240 } 2241 2242 /* 2243 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2244 * we NEED to make sure we are not already using the vtag. If so we 2245 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2246 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2247 SCTP_BASE_INFO(hashasocmark))]; 2248 LIST_FOREACH(stcb, head, sctp_asocs) { 2249 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2250 -- SEND ABORT - TRY AGAIN -- 2251 } 2252 } 2253 */ 2254 2255 /* 2256 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2257 * existing (non-NULL) TCB 2258 */ 2259 static struct mbuf * 2260 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2261 struct sockaddr *src, struct sockaddr *dst, 2262 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2263 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2264 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2265 struct sctp_tcb **locked_tcb, 2266 uint8_t mflowtype, uint32_t mflowid, 2267 uint32_t vrf_id, uint16_t port) 2268 { 2269 struct sctp_state_cookie *cookie; 2270 struct sctp_tcb *l_stcb = *stcb; 2271 struct sctp_inpcb *l_inp; 2272 struct sockaddr *to; 2273 struct sctp_pcb *ep; 2274 struct mbuf *m_sig; 2275 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2276 uint8_t *sig; 2277 uint8_t cookie_ok = 0; 2278 unsigned int sig_offset, cookie_offset; 2279 unsigned int cookie_len; 2280 struct timeval now; 2281 struct timeval time_entered, time_expires; 2282 int notification = 0; 2283 struct sctp_nets *netl; 2284 int had_a_existing_tcb = 0; 2285 int send_int_conf = 0; 2286 #ifdef INET 2287 struct sockaddr_in sin; 2288 #endif 2289 #ifdef INET6 2290 struct sockaddr_in6 sin6; 2291 #endif 2292 2293 SCTPDBG(SCTP_DEBUG_INPUT2, 2294 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2295 2296 if (inp_p == NULL) { 2297 return (NULL); 2298 } 2299 cookie = &cp->cookie; 2300 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2301 cookie_len = ntohs(cp->ch.chunk_length); 2302 2303 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2304 sizeof(struct sctp_init_chunk) + 2305 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2306 /* cookie too small */ 2307 return (NULL); 2308 } 2309 if ((cookie->peerport != sh->src_port) || 2310 (cookie->myport != sh->dest_port) || 2311 (cookie->my_vtag != sh->v_tag)) { 2312 /* 2313 * invalid ports or bad tag. Note that we always leave the 2314 * v_tag in the header in network order and when we stored 2315 * it in the my_vtag slot we also left it in network order. 2316 * This maintains the match even though it may be in the 2317 * opposite byte order of the machine :-> 2318 */ 2319 return (NULL); 2320 } 2321 /* 2322 * split off the signature into its own mbuf (since it should not be 2323 * calculated in the sctp_hmac_m() call). 2324 */ 2325 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2326 m_sig = m_split(m, sig_offset, M_NOWAIT); 2327 if (m_sig == NULL) { 2328 /* out of memory or ?? */ 2329 return (NULL); 2330 } 2331 #ifdef SCTP_MBUF_LOGGING 2332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2333 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2334 } 2335 #endif 2336 2337 /* 2338 * compute the signature/digest for the cookie 2339 */ 2340 if (l_stcb != NULL) { 2341 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2342 SCTP_TCB_UNLOCK(l_stcb); 2343 } 2344 l_inp = *inp_p; 2345 SCTP_INP_RLOCK(l_inp); 2346 if (l_stcb != NULL) { 2347 SCTP_TCB_LOCK(l_stcb); 2348 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2349 } 2350 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2351 SCTP_INP_RUNLOCK(l_inp); 2352 sctp_m_freem(m_sig); 2353 return (NULL); 2354 } 2355 ep = &(*inp_p)->sctp_ep; 2356 /* which cookie is it? */ 2357 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2358 (ep->current_secret_number != ep->last_secret_number)) { 2359 /* it's the old cookie */ 2360 (void)sctp_hmac_m(SCTP_HMAC, 2361 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2362 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2363 } else { 2364 /* it's the current cookie */ 2365 (void)sctp_hmac_m(SCTP_HMAC, 2366 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2367 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2368 } 2369 /* get the signature */ 2370 SCTP_INP_RUNLOCK(l_inp); 2371 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2372 if (sig == NULL) { 2373 /* couldn't find signature */ 2374 sctp_m_freem(m_sig); 2375 return (NULL); 2376 } 2377 /* compare the received digest with the computed digest */ 2378 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2379 /* try the old cookie? */ 2380 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2381 (ep->current_secret_number != ep->last_secret_number)) { 2382 /* compute digest with old */ 2383 (void)sctp_hmac_m(SCTP_HMAC, 2384 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2385 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2386 /* compare */ 2387 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2388 cookie_ok = 1; 2389 } 2390 } else { 2391 cookie_ok = 1; 2392 } 2393 2394 /* 2395 * Now before we continue we must reconstruct our mbuf so that 2396 * normal processing of any other chunks will work. 2397 */ 2398 { 2399 struct mbuf *m_at; 2400 2401 m_at = m; 2402 while (SCTP_BUF_NEXT(m_at) != NULL) { 2403 m_at = SCTP_BUF_NEXT(m_at); 2404 } 2405 SCTP_BUF_NEXT(m_at) = m_sig; 2406 } 2407 2408 if (cookie_ok == 0) { 2409 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2410 SCTPDBG(SCTP_DEBUG_INPUT2, 2411 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2412 (uint32_t)offset, cookie_offset, sig_offset); 2413 return (NULL); 2414 } 2415 2416 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2417 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2418 return (NULL); 2419 } 2420 time_entered.tv_sec = cookie->time_entered.tv_sec; 2421 time_entered.tv_usec = cookie->time_entered.tv_usec; 2422 if ((time_entered.tv_sec < 0) || 2423 (time_entered.tv_usec < 0) || 2424 (time_entered.tv_usec >= 1000000)) { 2425 /* Invalid time stamp. Cookie must have been modified. */ 2426 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2427 return (NULL); 2428 } 2429 (void)SCTP_GETTIME_TIMEVAL(&now); 2430 if (timevalcmp(&now, &time_entered, <)) { 2431 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2432 return (NULL); 2433 } 2434 /* 2435 * Check the cookie timestamps to be sure it's not stale. 2436 * cookie_life is in ticks, so we convert to seconds. 2437 */ 2438 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2439 time_expires.tv_usec = time_entered.tv_usec; 2440 if (timevalcmp(&now, &time_expires, >)) { 2441 /* cookie is stale! */ 2442 struct mbuf *op_err; 2443 struct sctp_error_stale_cookie *cause; 2444 struct timeval diff; 2445 uint32_t staleness; 2446 2447 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2448 0, M_NOWAIT, 1, MT_DATA); 2449 if (op_err == NULL) { 2450 /* FOOBAR */ 2451 return (NULL); 2452 } 2453 /* Set the len */ 2454 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2455 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2456 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2457 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2458 diff = now; 2459 timevalsub(&diff, &time_expires); 2460 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2461 staleness = UINT32_MAX; 2462 } else { 2463 staleness = (uint32_t)diff.tv_sec * 1000000; 2464 } 2465 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2466 staleness += (uint32_t)diff.tv_usec; 2467 } else { 2468 staleness = UINT32_MAX; 2469 } 2470 cause->stale_time = htonl(staleness); 2471 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2472 mflowtype, mflowid, l_inp->fibnum, 2473 vrf_id, port); 2474 return (NULL); 2475 } 2476 /* 2477 * Now we must see with the lookup address if we have an existing 2478 * asoc. This will only happen if we were in the COOKIE-WAIT state 2479 * and a INIT collided with us and somewhere the peer sent the 2480 * cookie on another address besides the single address our assoc 2481 * had for him. In this case we will have one of the tie-tags set at 2482 * least AND the address field in the cookie can be used to look it 2483 * up. 2484 */ 2485 to = NULL; 2486 switch (cookie->addr_type) { 2487 #ifdef INET6 2488 case SCTP_IPV6_ADDRESS: 2489 memset(&sin6, 0, sizeof(sin6)); 2490 sin6.sin6_family = AF_INET6; 2491 sin6.sin6_len = sizeof(sin6); 2492 sin6.sin6_port = sh->src_port; 2493 sin6.sin6_scope_id = cookie->scope_id; 2494 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2495 sizeof(sin6.sin6_addr.s6_addr)); 2496 to = (struct sockaddr *)&sin6; 2497 break; 2498 #endif 2499 #ifdef INET 2500 case SCTP_IPV4_ADDRESS: 2501 memset(&sin, 0, sizeof(sin)); 2502 sin.sin_family = AF_INET; 2503 sin.sin_len = sizeof(sin); 2504 sin.sin_port = sh->src_port; 2505 sin.sin_addr.s_addr = cookie->address[0]; 2506 to = (struct sockaddr *)&sin; 2507 break; 2508 #endif 2509 default: 2510 /* This should not happen */ 2511 return (NULL); 2512 } 2513 if (*stcb == NULL) { 2514 /* Yep, lets check */ 2515 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2516 if (*stcb == NULL) { 2517 /* 2518 * We should have only got back the same inp. If we 2519 * got back a different ep we have a problem. The 2520 * original findep got back l_inp and now 2521 */ 2522 if (l_inp != *inp_p) { 2523 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2524 } 2525 } else { 2526 if (*locked_tcb == NULL) { 2527 /* 2528 * In this case we found the assoc only 2529 * after we locked the create lock. This 2530 * means we are in a colliding case and we 2531 * must make sure that we unlock the tcb if 2532 * its one of the cases where we throw away 2533 * the incoming packets. 2534 */ 2535 *locked_tcb = *stcb; 2536 2537 /* 2538 * We must also increment the inp ref count 2539 * since the ref_count flags was set when we 2540 * did not find the TCB, now we found it 2541 * which reduces the refcount.. we must 2542 * raise it back out to balance it all :-) 2543 */ 2544 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2545 if ((*stcb)->sctp_ep != l_inp) { 2546 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2547 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2548 } 2549 } 2550 } 2551 } 2552 2553 cookie_len -= SCTP_SIGNATURE_SIZE; 2554 if (*stcb == NULL) { 2555 /* this is the "normal" case... get a new TCB */ 2556 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2557 cookie, cookie_len, *inp_p, 2558 netp, to, ¬ification, 2559 auth_skipped, auth_offset, auth_len, 2560 mflowtype, mflowid, 2561 vrf_id, port); 2562 } else { 2563 /* this is abnormal... cookie-echo on existing TCB */ 2564 had_a_existing_tcb = 1; 2565 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2566 src, dst, sh, 2567 cookie, cookie_len, *inp_p, *stcb, netp, to, 2568 ¬ification, auth_skipped, auth_offset, auth_len, 2569 mflowtype, mflowid, 2570 vrf_id, port); 2571 if (*stcb == NULL) { 2572 *locked_tcb = NULL; 2573 } 2574 } 2575 2576 if (*stcb == NULL) { 2577 /* still no TCB... must be bad cookie-echo */ 2578 return (NULL); 2579 } 2580 if (*netp != NULL) { 2581 (*netp)->flowtype = mflowtype; 2582 (*netp)->flowid = mflowid; 2583 } 2584 /* 2585 * Ok, we built an association so confirm the address we sent the 2586 * INIT-ACK to. 2587 */ 2588 netl = sctp_findnet(*stcb, to); 2589 /* 2590 * This code should in theory NOT run but 2591 */ 2592 if (netl == NULL) { 2593 /* TSNH! Huh, why do I need to add this address here? */ 2594 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2595 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2596 return (NULL); 2597 } 2598 netl = sctp_findnet(*stcb, to); 2599 } 2600 if (netl) { 2601 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2602 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2603 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2604 netl); 2605 send_int_conf = 1; 2606 } 2607 } 2608 sctp_start_net_timers(*stcb); 2609 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2610 if (!had_a_existing_tcb || 2611 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2612 /* 2613 * If we have a NEW cookie or the connect never 2614 * reached the connected state during collision we 2615 * must do the TCP accept thing. 2616 */ 2617 struct socket *so, *oso; 2618 struct sctp_inpcb *inp; 2619 2620 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2621 /* 2622 * For a restart we will keep the same 2623 * socket, no need to do anything. I THINK!! 2624 */ 2625 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2626 if (send_int_conf) { 2627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2628 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2629 } 2630 return (m); 2631 } 2632 oso = (*inp_p)->sctp_socket; 2633 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2634 SCTP_TCB_UNLOCK((*stcb)); 2635 CURVNET_SET(oso->so_vnet); 2636 so = sonewconn(oso, 0 2637 ); 2638 CURVNET_RESTORE(); 2639 SCTP_TCB_LOCK((*stcb)); 2640 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2641 2642 if (so == NULL) { 2643 struct mbuf *op_err; 2644 2645 /* Too many sockets */ 2646 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2647 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2648 sctp_abort_association(*inp_p, NULL, m, iphlen, 2649 src, dst, sh, op_err, 2650 mflowtype, mflowid, 2651 vrf_id, port); 2652 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2653 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2654 return (NULL); 2655 } 2656 inp = (struct sctp_inpcb *)so->so_pcb; 2657 SCTP_INP_INCR_REF(inp); 2658 /* 2659 * We add the unbound flag here so that if we get an 2660 * soabort() before we get the move_pcb done, we 2661 * will properly cleanup. 2662 */ 2663 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2664 SCTP_PCB_FLAGS_CONNECTED | 2665 SCTP_PCB_FLAGS_IN_TCPPOOL | 2666 SCTP_PCB_FLAGS_UNBOUND | 2667 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2668 SCTP_PCB_FLAGS_DONT_WAKE); 2669 inp->sctp_features = (*inp_p)->sctp_features; 2670 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2671 inp->sctp_socket = so; 2672 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2673 inp->max_cwnd = (*inp_p)->max_cwnd; 2674 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2675 inp->ecn_supported = (*inp_p)->ecn_supported; 2676 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2677 inp->auth_supported = (*inp_p)->auth_supported; 2678 inp->asconf_supported = (*inp_p)->asconf_supported; 2679 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2680 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2681 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2682 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2683 inp->sctp_context = (*inp_p)->sctp_context; 2684 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2685 inp->fibnum = (*inp_p)->fibnum; 2686 /* 2687 * copy in the authentication parameters from the 2688 * original endpoint 2689 */ 2690 if (inp->sctp_ep.local_hmacs) 2691 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2692 inp->sctp_ep.local_hmacs = 2693 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2694 if (inp->sctp_ep.local_auth_chunks) 2695 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2696 inp->sctp_ep.local_auth_chunks = 2697 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2698 2699 /* 2700 * Now we must move it from one hash table to 2701 * another and get the tcb in the right place. 2702 */ 2703 2704 /* 2705 * This is where the one-2-one socket is put into 2706 * the accept state waiting for the accept! 2707 */ 2708 if (*stcb) { 2709 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2710 } 2711 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2712 2713 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2714 SCTP_TCB_UNLOCK((*stcb)); 2715 2716 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2717 0); 2718 SCTP_TCB_LOCK((*stcb)); 2719 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2720 2721 /* 2722 * now we must check to see if we were aborted while 2723 * the move was going on and the lock/unlock 2724 * happened. 2725 */ 2726 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2727 /* 2728 * yep it was, we leave the assoc attached 2729 * to the socket since the sctp_inpcb_free() 2730 * call will send an abort for us. 2731 */ 2732 SCTP_INP_DECR_REF(inp); 2733 return (NULL); 2734 } 2735 SCTP_INP_DECR_REF(inp); 2736 /* Switch over to the new guy */ 2737 *inp_p = inp; 2738 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2739 if (send_int_conf) { 2740 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2741 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2742 } 2743 2744 /* 2745 * Pull it from the incomplete queue and wake the 2746 * guy 2747 */ 2748 soisconnected(so); 2749 return (m); 2750 } 2751 } 2752 if (notification) { 2753 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2754 } 2755 if (send_int_conf) { 2756 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2757 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2758 } 2759 return (m); 2760 } 2761 2762 static void 2763 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2764 struct sctp_tcb *stcb, struct sctp_nets *net) 2765 { 2766 /* cp must not be used, others call this without a c-ack :-) */ 2767 struct sctp_association *asoc; 2768 struct sctp_tmit_chunk *chk; 2769 2770 SCTPDBG(SCTP_DEBUG_INPUT2, 2771 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2772 if ((stcb == NULL) || (net == NULL)) { 2773 return; 2774 } 2775 2776 asoc = &stcb->asoc; 2777 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2778 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2779 asoc->overall_error_count, 2780 0, 2781 SCTP_FROM_SCTP_INPUT, 2782 __LINE__); 2783 } 2784 sctp_stop_all_cookie_timers(stcb); 2785 /* process according to association state */ 2786 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2787 /* state change only needed when I am in right state */ 2788 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2789 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2790 sctp_start_net_timers(stcb); 2791 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2792 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2793 stcb->sctp_ep, stcb, NULL); 2794 } 2795 /* update RTO */ 2796 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2797 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2798 if (asoc->overall_error_count == 0) { 2799 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2800 SCTP_RTT_FROM_NON_DATA); 2801 } 2802 /* 2803 * Since we did not send a HB make sure we don't double 2804 * things. 2805 */ 2806 asoc->overall_error_count = 0; 2807 net->hb_responded = 1; 2808 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2809 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2810 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2811 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2812 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2813 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2814 soisconnected(stcb->sctp_socket); 2815 } 2816 } 2817 2818 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2819 /* 2820 * We don't need to do the asconf thing, nor hb or 2821 * autoclose if the socket is closed. 2822 */ 2823 goto closed_socket; 2824 } 2825 2826 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2827 stcb, net); 2828 2829 if (stcb->asoc.sctp_autoclose_ticks && 2830 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2831 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2832 stcb->sctp_ep, stcb, NULL); 2833 } 2834 /* 2835 * send ASCONF if parameters are pending and ASCONFs are 2836 * allowed (eg. addresses changed when init/cookie echo were 2837 * in flight) 2838 */ 2839 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2840 (stcb->asoc.asconf_supported == 1) && 2841 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2842 #ifdef SCTP_TIMER_BASED_ASCONF 2843 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2844 stcb->sctp_ep, stcb, 2845 stcb->asoc.primary_destination); 2846 #else 2847 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2848 SCTP_ADDR_NOT_LOCKED); 2849 #endif 2850 } 2851 } 2852 closed_socket: 2853 /* Toss the cookie if I can */ 2854 sctp_toss_old_cookies(stcb, asoc); 2855 /* Restart the timer if we have pending data */ 2856 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2857 if (chk->whoTo != NULL) { 2858 break; 2859 } 2860 } 2861 if (chk != NULL) { 2862 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2863 } 2864 } 2865 2866 static void 2867 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2868 struct sctp_tcb *stcb) 2869 { 2870 struct sctp_nets *net; 2871 struct sctp_tmit_chunk *lchk; 2872 struct sctp_ecne_chunk bkup; 2873 uint8_t override_bit; 2874 uint32_t tsn, window_data_tsn; 2875 int len; 2876 unsigned int pkt_cnt; 2877 2878 len = ntohs(cp->ch.chunk_length); 2879 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2880 /* Its the old format */ 2881 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2882 bkup.num_pkts_since_cwr = htonl(1); 2883 cp = &bkup; 2884 } 2885 SCTP_STAT_INCR(sctps_recvecne); 2886 tsn = ntohl(cp->tsn); 2887 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2888 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2889 if (lchk == NULL) { 2890 window_data_tsn = stcb->asoc.sending_seq - 1; 2891 } else { 2892 window_data_tsn = lchk->rec.data.tsn; 2893 } 2894 2895 /* Find where it was sent to if possible. */ 2896 net = NULL; 2897 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2898 if (lchk->rec.data.tsn == tsn) { 2899 net = lchk->whoTo; 2900 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2901 break; 2902 } 2903 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2904 break; 2905 } 2906 } 2907 if (net == NULL) { 2908 /* 2909 * What to do. A previous send of a CWR was possibly lost. 2910 * See how old it is, we may have it marked on the actual 2911 * net. 2912 */ 2913 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2914 if (tsn == net->last_cwr_tsn) { 2915 /* Found him, send it off */ 2916 break; 2917 } 2918 } 2919 if (net == NULL) { 2920 /* 2921 * If we reach here, we need to send a special CWR 2922 * that says hey, we did this a long time ago and 2923 * you lost the response. 2924 */ 2925 net = TAILQ_FIRST(&stcb->asoc.nets); 2926 if (net == NULL) { 2927 /* TSNH */ 2928 return; 2929 } 2930 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2931 } else { 2932 override_bit = 0; 2933 } 2934 } else { 2935 override_bit = 0; 2936 } 2937 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2938 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2939 /* 2940 * JRS - Use the congestion control given in the pluggable 2941 * CC module 2942 */ 2943 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2944 /* 2945 * We reduce once every RTT. So we will only lower cwnd at 2946 * the next sending seq i.e. the window_data_tsn 2947 */ 2948 net->cwr_window_tsn = window_data_tsn; 2949 net->ecn_ce_pkt_cnt += pkt_cnt; 2950 net->lost_cnt = pkt_cnt; 2951 net->last_cwr_tsn = tsn; 2952 } else { 2953 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2954 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2955 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2956 /* 2957 * Another loss in the same window update how many 2958 * marks/packets lost we have had. 2959 */ 2960 int cnt = 1; 2961 2962 if (pkt_cnt > net->lost_cnt) { 2963 /* Should be the case */ 2964 cnt = (pkt_cnt - net->lost_cnt); 2965 net->ecn_ce_pkt_cnt += cnt; 2966 } 2967 net->lost_cnt = pkt_cnt; 2968 net->last_cwr_tsn = tsn; 2969 /* 2970 * Most CC functions will ignore this call, since we 2971 * are in-window yet of the initial CE the peer saw. 2972 */ 2973 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2974 } 2975 } 2976 /* 2977 * We always send a CWR this way if our previous one was lost our 2978 * peer will get an update, or if it is not time again to reduce we 2979 * still get the cwr to the peer. Note we set the override when we 2980 * could not find the TSN on the chunk or the destination network. 2981 */ 2982 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2983 } 2984 2985 static void 2986 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2987 { 2988 /* 2989 * Here we get a CWR from the peer. We must look in the outqueue and 2990 * make sure that we have a covered ECNE in the control chunk part. 2991 * If so remove it. 2992 */ 2993 struct sctp_tmit_chunk *chk, *nchk; 2994 struct sctp_ecne_chunk *ecne; 2995 int override; 2996 uint32_t cwr_tsn; 2997 2998 cwr_tsn = ntohl(cp->tsn); 2999 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 3000 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 3001 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 3002 continue; 3003 } 3004 if ((override == 0) && (chk->whoTo != net)) { 3005 /* Must be from the right src unless override is set */ 3006 continue; 3007 } 3008 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 3009 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 3010 /* this covers this ECNE, we can remove it */ 3011 stcb->asoc.ecn_echo_cnt_onq--; 3012 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 3013 sctp_next); 3014 stcb->asoc.ctrl_queue_cnt--; 3015 sctp_m_freem(chk->data); 3016 chk->data = NULL; 3017 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3018 if (override == 0) { 3019 break; 3020 } 3021 } 3022 } 3023 } 3024 3025 static void 3026 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3027 struct sctp_tcb *stcb, struct sctp_nets *net) 3028 { 3029 3030 SCTPDBG(SCTP_DEBUG_INPUT2, 3031 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3032 if (stcb == NULL) 3033 return; 3034 3035 /* process according to association state */ 3036 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3037 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3038 SCTPDBG(SCTP_DEBUG_INPUT2, 3039 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3040 SCTP_TCB_UNLOCK(stcb); 3041 return; 3042 } 3043 /* notify upper layer protocol */ 3044 if (stcb->sctp_socket) { 3045 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3046 } 3047 #ifdef INVARIANTS 3048 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3049 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3050 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3051 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3052 } 3053 #endif 3054 /* stop the timer */ 3055 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3056 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3057 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3058 /* free the TCB */ 3059 SCTPDBG(SCTP_DEBUG_INPUT2, 3060 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3061 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3062 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3063 return; 3064 } 3065 3066 static int 3067 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3068 struct sctp_nets *net, uint8_t flg) 3069 { 3070 switch (desc->chunk_type) { 3071 case SCTP_DATA: 3072 case SCTP_IDATA: 3073 /* find the tsn to resend (possibly) */ 3074 { 3075 uint32_t tsn; 3076 struct sctp_tmit_chunk *tp1; 3077 3078 tsn = ntohl(desc->tsn_ifany); 3079 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3080 if (tp1->rec.data.tsn == tsn) { 3081 /* found it */ 3082 break; 3083 } 3084 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3085 /* not found */ 3086 tp1 = NULL; 3087 break; 3088 } 3089 } 3090 if (tp1 == NULL) { 3091 /* 3092 * Do it the other way , aka without paying 3093 * attention to queue seq order. 3094 */ 3095 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3096 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3097 if (tp1->rec.data.tsn == tsn) { 3098 /* found it */ 3099 break; 3100 } 3101 } 3102 } 3103 if (tp1 == NULL) { 3104 SCTP_STAT_INCR(sctps_pdrptsnnf); 3105 } 3106 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3107 if (((flg & SCTP_BADCRC) == 0) && 3108 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3109 return (0); 3110 } 3111 if ((stcb->asoc.peers_rwnd == 0) && 3112 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3113 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3114 return (0); 3115 } 3116 if (stcb->asoc.peers_rwnd == 0 && 3117 (flg & SCTP_FROM_MIDDLE_BOX)) { 3118 SCTP_STAT_INCR(sctps_pdrpdizrw); 3119 return (0); 3120 } 3121 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3122 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3123 /* Payload not matching. */ 3124 SCTP_STAT_INCR(sctps_pdrpbadd); 3125 return (-1); 3126 } 3127 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3128 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3129 /* Payload not matching. */ 3130 SCTP_STAT_INCR(sctps_pdrpbadd); 3131 return (-1); 3132 } 3133 if (tp1->do_rtt) { 3134 /* 3135 * this guy had a RTO calculation 3136 * pending on it, cancel it 3137 */ 3138 if (tp1->whoTo->rto_needed == 0) { 3139 tp1->whoTo->rto_needed = 1; 3140 } 3141 tp1->do_rtt = 0; 3142 } 3143 SCTP_STAT_INCR(sctps_pdrpmark); 3144 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3145 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3146 /* 3147 * mark it as if we were doing a FR, since 3148 * we will be getting gap ack reports behind 3149 * the info from the router. 3150 */ 3151 tp1->rec.data.doing_fast_retransmit = 1; 3152 /* 3153 * mark the tsn with what sequences can 3154 * cause a new FR. 3155 */ 3156 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3157 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3158 } else { 3159 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3160 } 3161 3162 /* restart the timer */ 3163 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3164 stcb, tp1->whoTo, 3165 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3166 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3167 stcb, tp1->whoTo); 3168 3169 /* fix counts and things */ 3170 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3171 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3172 tp1->whoTo->flight_size, 3173 tp1->book_size, 3174 (uint32_t)(uintptr_t)stcb, 3175 tp1->rec.data.tsn); 3176 } 3177 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3178 sctp_flight_size_decrease(tp1); 3179 sctp_total_flight_decrease(stcb, tp1); 3180 } 3181 tp1->sent = SCTP_DATAGRAM_RESEND; 3182 } { 3183 /* audit code */ 3184 unsigned int audit; 3185 3186 audit = 0; 3187 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3188 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3189 audit++; 3190 } 3191 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3192 sctp_next) { 3193 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3194 audit++; 3195 } 3196 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3197 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3198 audit, stcb->asoc.sent_queue_retran_cnt); 3199 #ifndef SCTP_AUDITING_ENABLED 3200 stcb->asoc.sent_queue_retran_cnt = audit; 3201 #endif 3202 } 3203 } 3204 } 3205 break; 3206 case SCTP_ASCONF: 3207 { 3208 struct sctp_tmit_chunk *asconf; 3209 3210 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3211 sctp_next) { 3212 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3213 break; 3214 } 3215 } 3216 if (asconf) { 3217 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3218 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3219 asconf->sent = SCTP_DATAGRAM_RESEND; 3220 asconf->snd_count--; 3221 } 3222 } 3223 break; 3224 case SCTP_INITIATION: 3225 /* resend the INIT */ 3226 stcb->asoc.dropped_special_cnt++; 3227 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3228 /* 3229 * If we can get it in, in a few attempts we do 3230 * this, otherwise we let the timer fire. 3231 */ 3232 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3233 stcb, net, 3234 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3235 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3236 } 3237 break; 3238 case SCTP_SELECTIVE_ACK: 3239 case SCTP_NR_SELECTIVE_ACK: 3240 /* resend the sack */ 3241 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3242 break; 3243 case SCTP_HEARTBEAT_REQUEST: 3244 /* resend a demand HB */ 3245 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3246 /* 3247 * Only retransmit if we KNOW we wont destroy the 3248 * tcb 3249 */ 3250 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3251 } 3252 break; 3253 case SCTP_SHUTDOWN: 3254 sctp_send_shutdown(stcb, net); 3255 break; 3256 case SCTP_SHUTDOWN_ACK: 3257 sctp_send_shutdown_ack(stcb, net); 3258 break; 3259 case SCTP_COOKIE_ECHO: 3260 { 3261 struct sctp_tmit_chunk *cookie; 3262 3263 cookie = NULL; 3264 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3265 sctp_next) { 3266 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3267 break; 3268 } 3269 } 3270 if (cookie) { 3271 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3272 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3273 cookie->sent = SCTP_DATAGRAM_RESEND; 3274 sctp_stop_all_cookie_timers(stcb); 3275 } 3276 } 3277 break; 3278 case SCTP_COOKIE_ACK: 3279 sctp_send_cookie_ack(stcb); 3280 break; 3281 case SCTP_ASCONF_ACK: 3282 /* resend last asconf ack */ 3283 sctp_send_asconf_ack(stcb); 3284 break; 3285 case SCTP_IFORWARD_CUM_TSN: 3286 case SCTP_FORWARD_CUM_TSN: 3287 send_forward_tsn(stcb, &stcb->asoc); 3288 break; 3289 /* can't do anything with these */ 3290 case SCTP_PACKET_DROPPED: 3291 case SCTP_INITIATION_ACK: /* this should not happen */ 3292 case SCTP_HEARTBEAT_ACK: 3293 case SCTP_ABORT_ASSOCIATION: 3294 case SCTP_OPERATION_ERROR: 3295 case SCTP_SHUTDOWN_COMPLETE: 3296 case SCTP_ECN_ECHO: 3297 case SCTP_ECN_CWR: 3298 default: 3299 break; 3300 } 3301 return (0); 3302 } 3303 3304 void 3305 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3306 { 3307 uint32_t i; 3308 uint16_t temp; 3309 3310 /* 3311 * We set things to 0xffffffff since this is the last delivered 3312 * sequence and we will be sending in 0 after the reset. 3313 */ 3314 3315 if (number_entries) { 3316 for (i = 0; i < number_entries; i++) { 3317 temp = ntohs(list[i]); 3318 if (temp >= stcb->asoc.streamincnt) { 3319 continue; 3320 } 3321 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3322 } 3323 } else { 3324 list = NULL; 3325 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3326 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3327 } 3328 } 3329 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3330 } 3331 3332 static void 3333 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3334 { 3335 uint32_t i; 3336 uint16_t temp; 3337 3338 if (number_entries > 0) { 3339 for (i = 0; i < number_entries; i++) { 3340 temp = ntohs(list[i]); 3341 if (temp >= stcb->asoc.streamoutcnt) { 3342 /* no such stream */ 3343 continue; 3344 } 3345 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3346 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3347 } 3348 } else { 3349 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3350 stcb->asoc.strmout[i].next_mid_ordered = 0; 3351 stcb->asoc.strmout[i].next_mid_unordered = 0; 3352 } 3353 } 3354 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3355 } 3356 3357 static void 3358 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3359 { 3360 uint32_t i; 3361 uint16_t temp; 3362 3363 if (number_entries > 0) { 3364 for (i = 0; i < number_entries; i++) { 3365 temp = ntohs(list[i]); 3366 if (temp >= stcb->asoc.streamoutcnt) { 3367 /* no such stream */ 3368 continue; 3369 } 3370 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3371 } 3372 } else { 3373 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3374 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3375 } 3376 } 3377 } 3378 3379 struct sctp_stream_reset_request * 3380 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3381 { 3382 struct sctp_association *asoc; 3383 struct sctp_chunkhdr *ch; 3384 struct sctp_stream_reset_request *r; 3385 struct sctp_tmit_chunk *chk; 3386 int len, clen; 3387 3388 asoc = &stcb->asoc; 3389 chk = asoc->str_reset; 3390 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3391 (chk == NULL)) { 3392 asoc->stream_reset_outstanding = 0; 3393 return (NULL); 3394 } 3395 if (chk->data == NULL) { 3396 return (NULL); 3397 } 3398 if (bchk != NULL) { 3399 /* he wants a copy of the chk pointer */ 3400 *bchk = chk; 3401 } 3402 clen = chk->send_size; 3403 ch = mtod(chk->data, struct sctp_chunkhdr *); 3404 r = (struct sctp_stream_reset_request *)(ch + 1); 3405 if (ntohl(r->request_seq) == seq) { 3406 /* found it */ 3407 return (r); 3408 } 3409 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3410 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3411 /* move to the next one, there can only be a max of two */ 3412 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3413 if (ntohl(r->request_seq) == seq) { 3414 return (r); 3415 } 3416 } 3417 /* that seq is not here */ 3418 return (NULL); 3419 } 3420 3421 static void 3422 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3423 { 3424 struct sctp_association *asoc; 3425 struct sctp_tmit_chunk *chk; 3426 3427 asoc = &stcb->asoc; 3428 chk = asoc->str_reset; 3429 if (chk == NULL) { 3430 return; 3431 } 3432 asoc->str_reset = NULL; 3433 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3434 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3435 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3436 asoc->ctrl_queue_cnt--; 3437 if (chk->data) { 3438 sctp_m_freem(chk->data); 3439 chk->data = NULL; 3440 } 3441 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3442 } 3443 3444 static int 3445 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3446 uint32_t seq, uint32_t action, 3447 struct sctp_stream_reset_response *respin) 3448 { 3449 uint16_t type; 3450 int lparam_len; 3451 struct sctp_association *asoc = &stcb->asoc; 3452 struct sctp_tmit_chunk *chk; 3453 struct sctp_stream_reset_request *req_param; 3454 struct sctp_stream_reset_out_request *req_out_param; 3455 struct sctp_stream_reset_in_request *req_in_param; 3456 uint32_t number_entries; 3457 3458 if (asoc->stream_reset_outstanding == 0) { 3459 /* duplicate */ 3460 return (0); 3461 } 3462 if (seq == stcb->asoc.str_reset_seq_out) { 3463 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3464 if (req_param != NULL) { 3465 stcb->asoc.str_reset_seq_out++; 3466 type = ntohs(req_param->ph.param_type); 3467 lparam_len = ntohs(req_param->ph.param_length); 3468 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3469 int no_clear = 0; 3470 3471 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3472 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3473 asoc->stream_reset_out_is_outstanding = 0; 3474 if (asoc->stream_reset_outstanding) 3475 asoc->stream_reset_outstanding--; 3476 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3477 /* do it */ 3478 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3479 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3480 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3481 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3482 /* 3483 * Set it up so we don't stop 3484 * retransmitting 3485 */ 3486 asoc->stream_reset_outstanding++; 3487 stcb->asoc.str_reset_seq_out--; 3488 asoc->stream_reset_out_is_outstanding = 1; 3489 no_clear = 1; 3490 } else { 3491 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3492 } 3493 if (no_clear == 0) { 3494 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3495 } 3496 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3497 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3498 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3499 if (asoc->stream_reset_outstanding) 3500 asoc->stream_reset_outstanding--; 3501 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3502 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3503 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3504 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3505 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3506 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3507 } 3508 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3509 /* Ok we now may have more streams */ 3510 int num_stream; 3511 3512 num_stream = stcb->asoc.strm_pending_add_size; 3513 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3514 /* TSNH */ 3515 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3516 } 3517 stcb->asoc.strm_pending_add_size = 0; 3518 if (asoc->stream_reset_outstanding) 3519 asoc->stream_reset_outstanding--; 3520 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3521 /* Put the new streams into effect */ 3522 int i; 3523 3524 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3525 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3526 } 3527 asoc->streamoutcnt += num_stream; 3528 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3529 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3530 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3531 SCTP_STREAM_CHANGE_DENIED); 3532 } else { 3533 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3534 SCTP_STREAM_CHANGE_FAILED); 3535 } 3536 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3537 if (asoc->stream_reset_outstanding) 3538 asoc->stream_reset_outstanding--; 3539 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3540 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3541 SCTP_STREAM_CHANGE_DENIED); 3542 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3543 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3544 SCTP_STREAM_CHANGE_FAILED); 3545 } 3546 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3547 /** 3548 * a) Adopt the new in tsn. 3549 * b) reset the map 3550 * c) Adopt the new out-tsn 3551 */ 3552 struct sctp_stream_reset_response_tsn *resp; 3553 struct sctp_forward_tsn_chunk fwdtsn; 3554 int abort_flag = 0; 3555 3556 if (respin == NULL) { 3557 /* huh ? */ 3558 return (0); 3559 } 3560 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3561 return (0); 3562 } 3563 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3564 resp = (struct sctp_stream_reset_response_tsn *)respin; 3565 asoc->stream_reset_outstanding--; 3566 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3567 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3568 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3569 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3570 if (abort_flag) { 3571 return (1); 3572 } 3573 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3574 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3575 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3576 } 3577 3578 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3579 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3580 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3581 3582 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3583 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3584 3585 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3586 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3587 3588 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3589 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3590 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3591 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3592 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3593 SCTP_ASSOC_RESET_DENIED); 3594 } else { 3595 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3596 SCTP_ASSOC_RESET_FAILED); 3597 } 3598 } 3599 /* get rid of the request and get the request flags */ 3600 if (asoc->stream_reset_outstanding == 0) { 3601 sctp_clean_up_stream_reset(stcb); 3602 } 3603 } 3604 } 3605 if (asoc->stream_reset_outstanding == 0) { 3606 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3607 } 3608 return (0); 3609 } 3610 3611 static void 3612 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3613 struct sctp_tmit_chunk *chk, 3614 struct sctp_stream_reset_in_request *req, int trunc) 3615 { 3616 uint32_t seq; 3617 int len, i; 3618 int number_entries; 3619 uint16_t temp; 3620 3621 /* 3622 * peer wants me to send a str-reset to him for my outgoing seq's if 3623 * seq_in is right. 3624 */ 3625 struct sctp_association *asoc = &stcb->asoc; 3626 3627 seq = ntohl(req->request_seq); 3628 if (asoc->str_reset_seq_in == seq) { 3629 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3630 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3631 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3632 } else if (trunc) { 3633 /* Can't do it, since they exceeded our buffer size */ 3634 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3635 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3636 len = ntohs(req->ph.param_length); 3637 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3638 if (number_entries) { 3639 for (i = 0; i < number_entries; i++) { 3640 temp = ntohs(req->list_of_streams[i]); 3641 if (temp >= stcb->asoc.streamoutcnt) { 3642 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3643 goto bad_boy; 3644 } 3645 req->list_of_streams[i] = temp; 3646 } 3647 for (i = 0; i < number_entries; i++) { 3648 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3649 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3650 } 3651 } 3652 } else { 3653 /* Its all */ 3654 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3655 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3656 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3657 } 3658 } 3659 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3660 } else { 3661 /* Can't do it, since we have sent one out */ 3662 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3663 } 3664 bad_boy: 3665 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3666 asoc->str_reset_seq_in++; 3667 } else if (asoc->str_reset_seq_in - 1 == seq) { 3668 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3669 } else if (asoc->str_reset_seq_in - 2 == seq) { 3670 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3671 } else { 3672 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3673 } 3674 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3675 } 3676 3677 static int 3678 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3679 struct sctp_tmit_chunk *chk, 3680 struct sctp_stream_reset_tsn_request *req) 3681 { 3682 /* reset all in and out and update the tsn */ 3683 /* 3684 * A) reset my str-seq's on in and out. B) Select a receive next, 3685 * and set cum-ack to it. Also process this selected number as a 3686 * fwd-tsn as well. C) set in the response my next sending seq. 3687 */ 3688 struct sctp_forward_tsn_chunk fwdtsn; 3689 struct sctp_association *asoc = &stcb->asoc; 3690 int abort_flag = 0; 3691 uint32_t seq; 3692 3693 seq = ntohl(req->request_seq); 3694 if (asoc->str_reset_seq_in == seq) { 3695 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3696 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3697 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3698 } else { 3699 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3700 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3701 fwdtsn.ch.chunk_flags = 0; 3702 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3703 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3704 if (abort_flag) { 3705 return (1); 3706 } 3707 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3708 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3709 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3710 } 3711 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3712 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3713 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3714 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3715 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3716 atomic_add_int(&asoc->sending_seq, 1); 3717 /* save off historical data for retrans */ 3718 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3719 asoc->last_sending_seq[0] = asoc->sending_seq; 3720 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3721 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3722 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3723 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3724 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3725 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3726 } 3727 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3728 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3729 asoc->str_reset_seq_in++; 3730 } else if (asoc->str_reset_seq_in - 1 == seq) { 3731 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3732 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3733 } else if (asoc->str_reset_seq_in - 2 == seq) { 3734 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3735 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3736 } else { 3737 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3738 } 3739 return (0); 3740 } 3741 3742 static void 3743 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3744 struct sctp_tmit_chunk *chk, 3745 struct sctp_stream_reset_out_request *req, int trunc) 3746 { 3747 uint32_t seq, tsn; 3748 int number_entries, len; 3749 struct sctp_association *asoc = &stcb->asoc; 3750 3751 seq = ntohl(req->request_seq); 3752 3753 /* now if its not a duplicate we process it */ 3754 if (asoc->str_reset_seq_in == seq) { 3755 len = ntohs(req->ph.param_length); 3756 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3757 /* 3758 * the sender is resetting, handle the list issue.. we must 3759 * a) verify if we can do the reset, if so no problem b) If 3760 * we can't do the reset we must copy the request. c) queue 3761 * it, and setup the data in processor to trigger it off 3762 * when needed and dequeue all the queued data. 3763 */ 3764 tsn = ntohl(req->send_reset_at_tsn); 3765 3766 /* move the reset action back one */ 3767 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3768 if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) { 3769 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3770 } else if (trunc) { 3771 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3772 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3773 /* we can do it now */ 3774 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3775 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3776 } else { 3777 /* 3778 * we must queue it up and thus wait for the TSN's 3779 * to arrive that are at or before tsn 3780 */ 3781 struct sctp_stream_reset_list *liste; 3782 int siz; 3783 3784 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3785 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3786 siz, SCTP_M_STRESET); 3787 if (liste == NULL) { 3788 /* gak out of memory */ 3789 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3790 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3791 return; 3792 } 3793 liste->seq = seq; 3794 liste->tsn = tsn; 3795 liste->number_entries = number_entries; 3796 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3797 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3798 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3799 } 3800 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3801 asoc->str_reset_seq_in++; 3802 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3803 /* 3804 * one seq back, just echo back last action since my 3805 * response was lost. 3806 */ 3807 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3808 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3809 /* 3810 * two seq back, just echo back last action since my 3811 * response was lost. 3812 */ 3813 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3814 } else { 3815 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3816 } 3817 } 3818 3819 static void 3820 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3821 struct sctp_stream_reset_add_strm *str_add) 3822 { 3823 /* 3824 * Peer is requesting to add more streams. If its within our 3825 * max-streams we will allow it. 3826 */ 3827 uint32_t num_stream, i; 3828 uint32_t seq; 3829 struct sctp_association *asoc = &stcb->asoc; 3830 struct sctp_queued_to_read *ctl, *nctl; 3831 3832 /* Get the number. */ 3833 seq = ntohl(str_add->request_seq); 3834 num_stream = ntohs(str_add->number_of_streams); 3835 /* Now what would be the new total? */ 3836 if (asoc->str_reset_seq_in == seq) { 3837 num_stream += stcb->asoc.streamincnt; 3838 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3839 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3840 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3841 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3842 (num_stream > 0xffff)) { 3843 /* We must reject it they ask for to many */ 3844 denied: 3845 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3846 } else { 3847 /* Ok, we can do that :-) */ 3848 struct sctp_stream_in *oldstrm; 3849 3850 /* save off the old */ 3851 oldstrm = stcb->asoc.strmin; 3852 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3853 (num_stream * sizeof(struct sctp_stream_in)), 3854 SCTP_M_STRMI); 3855 if (stcb->asoc.strmin == NULL) { 3856 stcb->asoc.strmin = oldstrm; 3857 goto denied; 3858 } 3859 /* copy off the old data */ 3860 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3861 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3862 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3863 stcb->asoc.strmin[i].sid = i; 3864 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3865 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3866 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3867 /* now anything on those queues? */ 3868 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3869 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3870 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3871 } 3872 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3873 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3874 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3875 } 3876 } 3877 /* Init the new streams */ 3878 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3879 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3880 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3881 stcb->asoc.strmin[i].sid = i; 3882 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3883 stcb->asoc.strmin[i].pd_api_started = 0; 3884 stcb->asoc.strmin[i].delivery_started = 0; 3885 } 3886 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3887 /* update the size */ 3888 stcb->asoc.streamincnt = num_stream; 3889 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3890 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3891 } 3892 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3893 asoc->str_reset_seq_in++; 3894 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3895 /* 3896 * one seq back, just echo back last action since my 3897 * response was lost. 3898 */ 3899 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3900 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3901 /* 3902 * two seq back, just echo back last action since my 3903 * response was lost. 3904 */ 3905 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3906 } else { 3907 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3908 } 3909 } 3910 3911 static void 3912 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3913 struct sctp_stream_reset_add_strm *str_add) 3914 { 3915 /* 3916 * Peer is requesting to add more streams. If its within our 3917 * max-streams we will allow it. 3918 */ 3919 uint16_t num_stream; 3920 uint32_t seq; 3921 struct sctp_association *asoc = &stcb->asoc; 3922 3923 /* Get the number. */ 3924 seq = ntohl(str_add->request_seq); 3925 num_stream = ntohs(str_add->number_of_streams); 3926 /* Now what would be the new total? */ 3927 if (asoc->str_reset_seq_in == seq) { 3928 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3929 if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) { 3930 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3931 } else if (stcb->asoc.stream_reset_outstanding) { 3932 /* We must reject it we have something pending */ 3933 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3934 } else { 3935 /* Ok, we can do that :-) */ 3936 int mychk; 3937 3938 mychk = stcb->asoc.streamoutcnt; 3939 mychk += num_stream; 3940 if (mychk < 0x10000) { 3941 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3942 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3943 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3944 } 3945 } else { 3946 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3947 } 3948 } 3949 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3950 asoc->str_reset_seq_in++; 3951 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3952 /* 3953 * one seq back, just echo back last action since my 3954 * response was lost. 3955 */ 3956 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3957 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3958 /* 3959 * two seq back, just echo back last action since my 3960 * response was lost. 3961 */ 3962 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3963 } else { 3964 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3965 } 3966 } 3967 3968 #ifdef __GNUC__ 3969 __attribute__((noinline)) 3970 #endif 3971 static int 3972 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3973 struct sctp_chunkhdr *ch_req) 3974 { 3975 uint16_t remaining_length, param_len, ptype; 3976 struct sctp_paramhdr pstore; 3977 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3978 uint32_t seq = 0; 3979 int num_req = 0; 3980 int trunc = 0; 3981 struct sctp_tmit_chunk *chk; 3982 struct sctp_chunkhdr *ch; 3983 struct sctp_paramhdr *ph; 3984 int ret_code = 0; 3985 int num_param = 0; 3986 3987 /* now it may be a reset or a reset-response */ 3988 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3989 3990 /* setup for adding the response */ 3991 sctp_alloc_a_chunk(stcb, chk); 3992 if (chk == NULL) { 3993 return (ret_code); 3994 } 3995 chk->copy_by_ref = 0; 3996 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3997 chk->rec.chunk_id.can_take_data = 0; 3998 chk->flags = 0; 3999 chk->asoc = &stcb->asoc; 4000 chk->no_fr_allowed = 0; 4001 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 4002 chk->book_size_scale = 0; 4003 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 4004 if (chk->data == NULL) { 4005 strres_nochunk: 4006 if (chk->data) { 4007 sctp_m_freem(chk->data); 4008 chk->data = NULL; 4009 } 4010 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 4011 return (ret_code); 4012 } 4013 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 4014 4015 /* setup chunk parameters */ 4016 chk->sent = SCTP_DATAGRAM_UNSENT; 4017 chk->snd_count = 0; 4018 chk->whoTo = NULL; 4019 4020 ch = mtod(chk->data, struct sctp_chunkhdr *); 4021 ch->chunk_type = SCTP_STREAM_RESET; 4022 ch->chunk_flags = 0; 4023 ch->chunk_length = htons(chk->send_size); 4024 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 4025 offset += sizeof(struct sctp_chunkhdr); 4026 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 4027 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 4028 if (ph == NULL) { 4029 /* TSNH */ 4030 break; 4031 } 4032 param_len = ntohs(ph->param_length); 4033 if ((param_len > remaining_length) || 4034 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 4035 /* bad parameter length */ 4036 break; 4037 } 4038 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 4039 (uint8_t *)&cstore); 4040 if (ph == NULL) { 4041 /* TSNH */ 4042 break; 4043 } 4044 ptype = ntohs(ph->param_type); 4045 num_param++; 4046 if (param_len > sizeof(cstore)) { 4047 trunc = 1; 4048 } else { 4049 trunc = 0; 4050 } 4051 if (num_param > SCTP_MAX_RESET_PARAMS) { 4052 /* hit the max of parameters already sorry.. */ 4053 break; 4054 } 4055 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4056 struct sctp_stream_reset_out_request *req_out; 4057 4058 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4059 break; 4060 } 4061 req_out = (struct sctp_stream_reset_out_request *)ph; 4062 num_req++; 4063 if (stcb->asoc.stream_reset_outstanding) { 4064 seq = ntohl(req_out->response_seq); 4065 if (seq == stcb->asoc.str_reset_seq_out) { 4066 /* implicit ack */ 4067 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4068 } 4069 } 4070 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4071 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4072 struct sctp_stream_reset_add_strm *str_add; 4073 4074 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4075 break; 4076 } 4077 str_add = (struct sctp_stream_reset_add_strm *)ph; 4078 num_req++; 4079 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4080 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4081 struct sctp_stream_reset_add_strm *str_add; 4082 4083 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4084 break; 4085 } 4086 str_add = (struct sctp_stream_reset_add_strm *)ph; 4087 num_req++; 4088 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4089 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4090 struct sctp_stream_reset_in_request *req_in; 4091 4092 num_req++; 4093 req_in = (struct sctp_stream_reset_in_request *)ph; 4094 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4095 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4096 struct sctp_stream_reset_tsn_request *req_tsn; 4097 4098 num_req++; 4099 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4100 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4101 ret_code = 1; 4102 goto strres_nochunk; 4103 } 4104 /* no more */ 4105 break; 4106 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4107 struct sctp_stream_reset_response *resp; 4108 uint32_t result; 4109 4110 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4111 break; 4112 } 4113 resp = (struct sctp_stream_reset_response *)ph; 4114 seq = ntohl(resp->response_seq); 4115 result = ntohl(resp->result); 4116 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4117 ret_code = 1; 4118 goto strres_nochunk; 4119 } 4120 } else { 4121 break; 4122 } 4123 offset += SCTP_SIZE32(param_len); 4124 if (remaining_length >= SCTP_SIZE32(param_len)) { 4125 remaining_length -= SCTP_SIZE32(param_len); 4126 } else { 4127 remaining_length = 0; 4128 } 4129 } 4130 if (num_req == 0) { 4131 /* we have no response free the stuff */ 4132 goto strres_nochunk; 4133 } 4134 /* ok we have a chunk to link in */ 4135 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4136 chk, 4137 sctp_next); 4138 stcb->asoc.ctrl_queue_cnt++; 4139 return (ret_code); 4140 } 4141 4142 /* 4143 * Handle a router or endpoints report of a packet loss, there are two ways 4144 * to handle this, either we get the whole packet and must disect it 4145 * ourselves (possibly with truncation and or corruption) or it is a summary 4146 * from a middle box that did the disecting for us. 4147 */ 4148 static void 4149 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4150 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4151 { 4152 struct sctp_chunk_desc desc; 4153 struct sctp_chunkhdr *chk_hdr; 4154 struct sctp_data_chunk *data_chunk; 4155 struct sctp_idata_chunk *idata_chunk; 4156 uint32_t bottle_bw, on_queue; 4157 uint32_t offset, chk_len; 4158 uint16_t pktdrp_len; 4159 uint8_t pktdrp_flags; 4160 4161 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4162 ("PKTDROP chunk too small")); 4163 pktdrp_flags = cp->ch.chunk_flags; 4164 pktdrp_len = ntohs(cp->ch.chunk_length); 4165 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4166 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4167 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4168 /* The peer plays games with us. */ 4169 return; 4170 } 4171 } 4172 limit -= sizeof(struct sctp_pktdrop_chunk); 4173 offset = 0; 4174 if (offset == limit) { 4175 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4176 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4177 } 4178 } else if (offset + sizeof(struct sctphdr) > limit) { 4179 /* Only a partial SCTP common header. */ 4180 SCTP_STAT_INCR(sctps_pdrpcrupt); 4181 offset = limit; 4182 } else { 4183 /* XXX: Check embedded SCTP common header. */ 4184 offset += sizeof(struct sctphdr); 4185 } 4186 /* Now parse through the chunks themselves. */ 4187 while (offset < limit) { 4188 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4189 SCTP_STAT_INCR(sctps_pdrpcrupt); 4190 break; 4191 } 4192 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4193 desc.chunk_type = chk_hdr->chunk_type; 4194 /* get amount we need to move */ 4195 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4196 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4197 /* Someone is lying... */ 4198 break; 4199 } 4200 if (desc.chunk_type == SCTP_DATA) { 4201 if (stcb->asoc.idata_supported) { 4202 /* Some is playing games with us. */ 4203 break; 4204 } 4205 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4206 /* Some is playing games with us. */ 4207 break; 4208 } 4209 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4210 /* 4211 * Not enough data bytes available in the 4212 * chunk. 4213 */ 4214 SCTP_STAT_INCR(sctps_pdrpnedat); 4215 goto next_chunk; 4216 } 4217 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4218 /* Not enough data in buffer. */ 4219 break; 4220 } 4221 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4222 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4223 desc.tsn_ifany = data_chunk->dp.tsn; 4224 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4225 SCTP_STAT_INCR(sctps_pdrpmbda); 4226 } 4227 } else if (desc.chunk_type == SCTP_IDATA) { 4228 if (!stcb->asoc.idata_supported) { 4229 /* Some is playing games with us. */ 4230 break; 4231 } 4232 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4233 /* Some is playing games with us. */ 4234 break; 4235 } 4236 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4237 /* 4238 * Not enough data bytes available in the 4239 * chunk. 4240 */ 4241 SCTP_STAT_INCR(sctps_pdrpnedat); 4242 goto next_chunk; 4243 } 4244 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4245 /* Not enough data in buffer. */ 4246 break; 4247 } 4248 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4249 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4250 desc.tsn_ifany = idata_chunk->dp.tsn; 4251 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4252 SCTP_STAT_INCR(sctps_pdrpmbda); 4253 } 4254 } else { 4255 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4256 SCTP_STAT_INCR(sctps_pdrpmbct); 4257 } 4258 } 4259 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4260 SCTP_STAT_INCR(sctps_pdrppdbrk); 4261 break; 4262 } 4263 next_chunk: 4264 offset += SCTP_SIZE32(chk_len); 4265 } 4266 /* Now update any rwnd --- possibly */ 4267 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4268 /* From a peer, we get a rwnd report */ 4269 uint32_t a_rwnd; 4270 4271 SCTP_STAT_INCR(sctps_pdrpfehos); 4272 4273 bottle_bw = ntohl(cp->bottle_bw); 4274 on_queue = ntohl(cp->current_onq); 4275 if (bottle_bw && on_queue) { 4276 /* a rwnd report is in here */ 4277 if (bottle_bw > on_queue) 4278 a_rwnd = bottle_bw - on_queue; 4279 else 4280 a_rwnd = 0; 4281 4282 if (a_rwnd == 0) 4283 stcb->asoc.peers_rwnd = 0; 4284 else { 4285 if (a_rwnd > stcb->asoc.total_flight) { 4286 stcb->asoc.peers_rwnd = 4287 a_rwnd - stcb->asoc.total_flight; 4288 } else { 4289 stcb->asoc.peers_rwnd = 0; 4290 } 4291 if (stcb->asoc.peers_rwnd < 4292 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4293 /* SWS sender side engages */ 4294 stcb->asoc.peers_rwnd = 0; 4295 } 4296 } 4297 } 4298 } else { 4299 SCTP_STAT_INCR(sctps_pdrpfmbox); 4300 } 4301 4302 /* now middle boxes in sat networks get a cwnd bump */ 4303 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4304 (stcb->asoc.sat_t3_loss_recovery == 0) && 4305 (stcb->asoc.sat_network)) { 4306 /* 4307 * This is debatable but for sat networks it makes sense 4308 * Note if a T3 timer has went off, we will prohibit any 4309 * changes to cwnd until we exit the t3 loss recovery. 4310 */ 4311 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4312 net, cp, &bottle_bw, &on_queue); 4313 } 4314 } 4315 4316 /* 4317 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4318 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4319 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4320 * length of the complete packet outputs: - length: modified to remaining 4321 * length after control processing - netp: modified to new sctp_nets after 4322 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4323 * bad packet,...) otherwise return the tcb for this packet 4324 */ 4325 #ifdef __GNUC__ 4326 __attribute__((noinline)) 4327 #endif 4328 static struct sctp_tcb * 4329 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4330 struct sockaddr *src, struct sockaddr *dst, 4331 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4332 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4333 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4334 uint32_t vrf_id, uint16_t port) 4335 { 4336 struct sctp_association *asoc; 4337 struct mbuf *op_err; 4338 char msg[SCTP_DIAG_INFO_LEN]; 4339 uint32_t vtag_in; 4340 int num_chunks = 0; /* number of control chunks processed */ 4341 uint32_t chk_length, contiguous; 4342 int ret; 4343 int abort_no_unlock = 0; 4344 int ecne_seen = 0; 4345 int abort_flag; 4346 4347 /* 4348 * How big should this be, and should it be alloc'd? Lets try the 4349 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4350 * until we get into jumbo grams and such.. 4351 */ 4352 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4353 int got_auth = 0; 4354 uint32_t auth_offset = 0, auth_len = 0; 4355 int auth_skipped = 0; 4356 int asconf_cnt = 0; 4357 4358 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4359 iphlen, *offset, length, (void *)stcb); 4360 4361 if (stcb) { 4362 SCTP_TCB_LOCK_ASSERT(stcb); 4363 } 4364 /* validate chunk header length... */ 4365 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4366 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4367 ntohs(ch->chunk_length)); 4368 *offset = length; 4369 return (stcb); 4370 } 4371 /* 4372 * validate the verification tag 4373 */ 4374 vtag_in = ntohl(sh->v_tag); 4375 4376 if (ch->chunk_type == SCTP_INITIATION) { 4377 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4378 ntohs(ch->chunk_length), vtag_in); 4379 if (vtag_in != 0) { 4380 /* protocol error- silently discard... */ 4381 SCTP_STAT_INCR(sctps_badvtag); 4382 if (stcb != NULL) { 4383 SCTP_TCB_UNLOCK(stcb); 4384 } 4385 return (NULL); 4386 } 4387 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4388 /* 4389 * If there is no stcb, skip the AUTH chunk and process 4390 * later after a stcb is found (to validate the lookup was 4391 * valid. 4392 */ 4393 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4394 (stcb == NULL) && 4395 (inp->auth_supported == 1)) { 4396 /* save this chunk for later processing */ 4397 auth_skipped = 1; 4398 auth_offset = *offset; 4399 auth_len = ntohs(ch->chunk_length); 4400 4401 /* (temporarily) move past this chunk */ 4402 *offset += SCTP_SIZE32(auth_len); 4403 if (*offset >= length) { 4404 /* no more data left in the mbuf chain */ 4405 *offset = length; 4406 return (NULL); 4407 } 4408 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4409 sizeof(struct sctp_chunkhdr), chunk_buf); 4410 } 4411 if (ch == NULL) { 4412 /* Help */ 4413 *offset = length; 4414 return (stcb); 4415 } 4416 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4417 goto process_control_chunks; 4418 } 4419 /* 4420 * first check if it's an ASCONF with an unknown src addr we 4421 * need to look inside to find the association 4422 */ 4423 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4424 struct sctp_chunkhdr *asconf_ch = ch; 4425 uint32_t asconf_offset = 0, asconf_len = 0; 4426 4427 /* inp's refcount may be reduced */ 4428 SCTP_INP_INCR_REF(inp); 4429 4430 asconf_offset = *offset; 4431 do { 4432 asconf_len = ntohs(asconf_ch->chunk_length); 4433 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4434 break; 4435 stcb = sctp_findassociation_ep_asconf(m, 4436 *offset, 4437 dst, 4438 sh, &inp, netp, vrf_id); 4439 if (stcb != NULL) 4440 break; 4441 asconf_offset += SCTP_SIZE32(asconf_len); 4442 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4443 sizeof(struct sctp_chunkhdr), chunk_buf); 4444 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4445 if (stcb == NULL) { 4446 /* 4447 * reduce inp's refcount if not reduced in 4448 * sctp_findassociation_ep_asconf(). 4449 */ 4450 SCTP_INP_DECR_REF(inp); 4451 } 4452 4453 /* now go back and verify any auth chunk to be sure */ 4454 if (auth_skipped && (stcb != NULL)) { 4455 struct sctp_auth_chunk *auth; 4456 4457 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4458 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4459 got_auth = 1; 4460 auth_skipped = 0; 4461 } else { 4462 auth = NULL; 4463 } 4464 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4465 auth_offset)) { 4466 /* auth HMAC failed so dump it */ 4467 *offset = length; 4468 return (stcb); 4469 } else { 4470 /* remaining chunks are HMAC checked */ 4471 stcb->asoc.authenticated = 1; 4472 } 4473 } 4474 } 4475 if (stcb == NULL) { 4476 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4477 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4478 msg); 4479 /* no association, so it's out of the blue... */ 4480 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4481 mflowtype, mflowid, inp->fibnum, 4482 vrf_id, port); 4483 *offset = length; 4484 return (NULL); 4485 } 4486 asoc = &stcb->asoc; 4487 /* ABORT and SHUTDOWN can use either v_tag... */ 4488 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4489 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4490 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4491 /* Take the T-bit always into account. */ 4492 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4493 (vtag_in == asoc->my_vtag)) || 4494 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4495 (asoc->peer_vtag != htonl(0)) && 4496 (vtag_in == asoc->peer_vtag))) { 4497 /* this is valid */ 4498 } else { 4499 /* drop this packet... */ 4500 SCTP_STAT_INCR(sctps_badvtag); 4501 if (stcb != NULL) { 4502 SCTP_TCB_UNLOCK(stcb); 4503 } 4504 return (NULL); 4505 } 4506 } else { 4507 /* for all other chunks, vtag must match */ 4508 if (vtag_in != asoc->my_vtag) { 4509 /* invalid vtag... */ 4510 SCTPDBG(SCTP_DEBUG_INPUT3, 4511 "invalid vtag: %xh, expect %xh\n", 4512 vtag_in, asoc->my_vtag); 4513 SCTP_STAT_INCR(sctps_badvtag); 4514 if (stcb != NULL) { 4515 SCTP_TCB_UNLOCK(stcb); 4516 } 4517 *offset = length; 4518 return (NULL); 4519 } 4520 } 4521 } /* end if !SCTP_COOKIE_ECHO */ 4522 /* 4523 * process all control chunks... 4524 */ 4525 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4526 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4527 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4528 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4529 /* implied cookie-ack.. we must have lost the ack */ 4530 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4531 *netp); 4532 } 4533 4534 process_control_chunks: 4535 while (IS_SCTP_CONTROL(ch)) { 4536 /* validate chunk length */ 4537 chk_length = ntohs(ch->chunk_length); 4538 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4539 ch->chunk_type, chk_length); 4540 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4541 if (chk_length < sizeof(*ch) || 4542 (*offset + (int)chk_length) > length) { 4543 *offset = length; 4544 return (stcb); 4545 } 4546 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4547 /* 4548 * INIT and INIT-ACK only gets the init ack "header" portion 4549 * only because we don't have to process the peer's COOKIE. 4550 * All others get a complete chunk. 4551 */ 4552 switch (ch->chunk_type) { 4553 case SCTP_INITIATION: 4554 contiguous = sizeof(struct sctp_init_chunk); 4555 break; 4556 case SCTP_INITIATION_ACK: 4557 contiguous = sizeof(struct sctp_init_ack_chunk); 4558 break; 4559 default: 4560 contiguous = min(chk_length, sizeof(chunk_buf)); 4561 break; 4562 } 4563 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4564 contiguous, 4565 chunk_buf); 4566 if (ch == NULL) { 4567 *offset = length; 4568 return (stcb); 4569 } 4570 4571 num_chunks++; 4572 /* Save off the last place we got a control from */ 4573 if (stcb != NULL) { 4574 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4575 /* 4576 * allow last_control to be NULL if 4577 * ASCONF... ASCONF processing will find the 4578 * right net later 4579 */ 4580 if ((netp != NULL) && (*netp != NULL)) 4581 stcb->asoc.last_control_chunk_from = *netp; 4582 } 4583 } 4584 #ifdef SCTP_AUDITING_ENABLED 4585 sctp_audit_log(0xB0, ch->chunk_type); 4586 #endif 4587 4588 /* check to see if this chunk required auth, but isn't */ 4589 if ((stcb != NULL) && 4590 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4591 !stcb->asoc.authenticated) { 4592 /* "silently" ignore */ 4593 SCTP_STAT_INCR(sctps_recvauthmissing); 4594 goto next_chunk; 4595 } 4596 switch (ch->chunk_type) { 4597 case SCTP_INITIATION: 4598 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4599 /* The INIT chunk must be the only chunk. */ 4600 if ((num_chunks > 1) || 4601 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4602 /* 4603 * RFC 4960bis requires stopping the 4604 * processing of the packet. 4605 */ 4606 *offset = length; 4607 return (stcb); 4608 } 4609 /* Honor our resource limit. */ 4610 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4611 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4612 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 4613 mflowtype, mflowid, inp->fibnum, 4614 vrf_id, port); 4615 *offset = length; 4616 if (stcb != NULL) { 4617 SCTP_TCB_UNLOCK(stcb); 4618 } 4619 return (NULL); 4620 } 4621 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4622 (struct sctp_init_chunk *)ch, inp, 4623 stcb, *netp, 4624 mflowtype, mflowid, 4625 vrf_id, port); 4626 *offset = length; 4627 if (stcb != NULL) { 4628 SCTP_TCB_UNLOCK(stcb); 4629 } 4630 return (NULL); 4631 break; 4632 case SCTP_PAD_CHUNK: 4633 break; 4634 case SCTP_INITIATION_ACK: 4635 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n"); 4636 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4637 /* We are not interested anymore */ 4638 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) { 4639 ; 4640 } else { 4641 *offset = length; 4642 if (stcb != NULL) { 4643 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4644 SCTP_FROM_SCTP_INPUT + SCTP_LOC_29); 4645 } 4646 return (NULL); 4647 } 4648 } 4649 /* The INIT-ACK chunk must be the only chunk. */ 4650 if ((num_chunks > 1) || 4651 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4652 *offset = length; 4653 return (stcb); 4654 } 4655 if ((netp != NULL) && (*netp != NULL)) { 4656 ret = sctp_handle_init_ack(m, iphlen, *offset, 4657 src, dst, sh, 4658 (struct sctp_init_ack_chunk *)ch, 4659 stcb, *netp, 4660 &abort_no_unlock, 4661 mflowtype, mflowid, 4662 vrf_id); 4663 } else { 4664 ret = -1; 4665 } 4666 *offset = length; 4667 if (abort_no_unlock) { 4668 return (NULL); 4669 } 4670 /* 4671 * Special case, I must call the output routine to 4672 * get the cookie echoed 4673 */ 4674 if ((stcb != NULL) && (ret == 0)) { 4675 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 4676 } 4677 return (stcb); 4678 break; 4679 case SCTP_SELECTIVE_ACK: 4680 case SCTP_NR_SELECTIVE_ACK: 4681 { 4682 int abort_now = 0; 4683 uint32_t a_rwnd, cum_ack; 4684 uint16_t num_seg, num_nr_seg, num_dup; 4685 uint8_t flags; 4686 int offset_seg, offset_dup; 4687 4688 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 4689 ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK"); 4690 SCTP_STAT_INCR(sctps_recvsacks); 4691 if (stcb == NULL) { 4692 SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n", 4693 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK"); 4694 break; 4695 } 4696 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4697 if (chk_length < sizeof(struct sctp_sack_chunk)) { 4698 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n"); 4699 break; 4700 } 4701 } else { 4702 if (stcb->asoc.nrsack_supported == 0) { 4703 goto unknown_chunk; 4704 } 4705 if (chk_length < sizeof(struct sctp_nr_sack_chunk)) { 4706 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n"); 4707 break; 4708 } 4709 } 4710 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 4711 /*- 4712 * If we have sent a shutdown-ack, we will pay no 4713 * attention to a sack sent in to us since 4714 * we don't care anymore. 4715 */ 4716 break; 4717 } 4718 flags = ch->chunk_flags; 4719 if (ch->chunk_type == SCTP_SELECTIVE_ACK) { 4720 struct sctp_sack_chunk *sack; 4721 4722 sack = (struct sctp_sack_chunk *)ch; 4723 cum_ack = ntohl(sack->sack.cum_tsn_ack); 4724 num_seg = ntohs(sack->sack.num_gap_ack_blks); 4725 num_nr_seg = 0; 4726 num_dup = ntohs(sack->sack.num_dup_tsns); 4727 a_rwnd = ntohl(sack->sack.a_rwnd); 4728 if (sizeof(struct sctp_sack_chunk) + 4729 num_seg * sizeof(struct sctp_gap_ack_block) + 4730 num_dup * sizeof(uint32_t) != chk_length) { 4731 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n"); 4732 break; 4733 } 4734 offset_seg = *offset + sizeof(struct sctp_sack_chunk); 4735 offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block); 4736 } else { 4737 struct sctp_nr_sack_chunk *nr_sack; 4738 4739 nr_sack = (struct sctp_nr_sack_chunk *)ch; 4740 cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack); 4741 num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks); 4742 num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks); 4743 num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns); 4744 a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd); 4745 if (sizeof(struct sctp_nr_sack_chunk) + 4746 (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) + 4747 num_dup * sizeof(uint32_t) != chk_length) { 4748 SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n"); 4749 break; 4750 } 4751 offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk); 4752 offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block); 4753 } 4754 SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n", 4755 (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK", 4756 cum_ack, num_seg, a_rwnd); 4757 stcb->asoc.seen_a_sack_this_pkt = 1; 4758 if ((stcb->asoc.pr_sctp_cnt == 0) && 4759 (num_seg == 0) && (num_nr_seg == 0) && 4760 SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) && 4761 (stcb->asoc.saw_sack_with_frags == 0) && 4762 (stcb->asoc.saw_sack_with_nr_frags == 0) && 4763 (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) { 4764 /* 4765 * We have a SIMPLE sack having no 4766 * prior segments and data on sent 4767 * queue to be acked. Use the faster 4768 * path sack processing. We also 4769 * allow window update sacks with no 4770 * missing segments to go this way 4771 * too. 4772 */ 4773 sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 4774 &abort_now, ecne_seen); 4775 } else { 4776 if ((netp != NULL) && (*netp != NULL)) { 4777 sctp_handle_sack(m, offset_seg, offset_dup, stcb, 4778 num_seg, num_nr_seg, num_dup, &abort_now, flags, 4779 cum_ack, a_rwnd, ecne_seen); 4780 } 4781 } 4782 if (abort_now) { 4783 /* ABORT signal from sack processing */ 4784 *offset = length; 4785 return (NULL); 4786 } 4787 if (TAILQ_EMPTY(&stcb->asoc.send_queue) && 4788 TAILQ_EMPTY(&stcb->asoc.sent_queue) && 4789 (stcb->asoc.stream_queue_cnt == 0)) { 4790 sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 4791 } 4792 break; 4793 } 4794 case SCTP_HEARTBEAT_REQUEST: 4795 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n"); 4796 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4797 SCTP_STAT_INCR(sctps_recvheartbeat); 4798 sctp_send_heartbeat_ack(stcb, m, *offset, 4799 chk_length, *netp); 4800 } 4801 break; 4802 case SCTP_HEARTBEAT_ACK: 4803 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n"); 4804 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) { 4805 /* Its not ours */ 4806 break; 4807 } 4808 SCTP_STAT_INCR(sctps_recvheartbeatack); 4809 if ((netp != NULL) && (*netp != NULL)) { 4810 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4811 stcb, *netp); 4812 } 4813 break; 4814 case SCTP_ABORT_ASSOCIATION: 4815 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4816 (void *)stcb); 4817 *offset = length; 4818 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4819 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4820 return (NULL); 4821 } else { 4822 return (stcb); 4823 } 4824 } else { 4825 return (NULL); 4826 } 4827 break; 4828 case SCTP_SHUTDOWN: 4829 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4830 (void *)stcb); 4831 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4832 break; 4833 } 4834 if ((netp != NULL) && (*netp != NULL)) { 4835 abort_flag = 0; 4836 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4837 stcb, *netp, &abort_flag); 4838 if (abort_flag) { 4839 *offset = length; 4840 return (NULL); 4841 } 4842 } 4843 break; 4844 case SCTP_SHUTDOWN_ACK: 4845 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4846 if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) && 4847 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4848 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4849 *offset = length; 4850 return (NULL); 4851 } 4852 break; 4853 case SCTP_OPERATION_ERROR: 4854 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4855 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4856 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4857 *offset = length; 4858 return (NULL); 4859 } 4860 break; 4861 case SCTP_COOKIE_ECHO: 4862 SCTPDBG(SCTP_DEBUG_INPUT3, 4863 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4864 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4865 ; 4866 } else { 4867 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4868 /* We are not interested anymore */ 4869 abend: 4870 if (stcb != NULL) { 4871 SCTP_TCB_UNLOCK(stcb); 4872 } 4873 *offset = length; 4874 return (NULL); 4875 } 4876 } 4877 /*- 4878 * First are we accepting? We do this again here 4879 * since it is possible that a previous endpoint WAS 4880 * listening responded to a INIT-ACK and then 4881 * closed. We opened and bound.. and are now no 4882 * longer listening. 4883 * 4884 * XXXGL: notes on checking listen queue length. 4885 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4886 * SOLISTENING(), because a listening "UDP type" 4887 * socket isn't listening in terms of the socket 4888 * layer. It is a normal data flow socket, that 4889 * can fork off new connections. Thus, we should 4890 * look into sol_qlen only in case we are !UDP. 4891 * 2) Checking sol_qlen in general requires locking 4892 * the socket, and this code lacks that. 4893 */ 4894 if ((stcb == NULL) && 4895 (!SCTP_IS_LISTENING(inp) || 4896 (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) && 4897 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4898 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4899 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4900 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4901 sctp_abort_association(inp, stcb, m, iphlen, 4902 src, dst, sh, op_err, 4903 mflowtype, mflowid, 4904 vrf_id, port); 4905 } 4906 *offset = length; 4907 return (NULL); 4908 } else { 4909 struct mbuf *ret_buf; 4910 struct sctp_inpcb *linp; 4911 struct sctp_tmit_chunk *chk; 4912 4913 if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | 4914 SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4915 goto abend; 4916 } 4917 4918 if (stcb) { 4919 linp = NULL; 4920 } else { 4921 linp = inp; 4922 } 4923 4924 if (linp != NULL) { 4925 SCTP_ASOC_CREATE_LOCK(linp); 4926 } 4927 4928 if (netp != NULL) { 4929 struct sctp_tcb *locked_stcb; 4930 4931 locked_stcb = stcb; 4932 ret_buf = 4933 sctp_handle_cookie_echo(m, iphlen, 4934 *offset, 4935 src, dst, 4936 sh, 4937 (struct sctp_cookie_echo_chunk *)ch, 4938 &inp, &stcb, netp, 4939 auth_skipped, 4940 auth_offset, 4941 auth_len, 4942 &locked_stcb, 4943 mflowtype, 4944 mflowid, 4945 vrf_id, 4946 port); 4947 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4948 SCTP_TCB_UNLOCK(locked_stcb); 4949 } 4950 if (stcb != NULL) { 4951 SCTP_TCB_LOCK_ASSERT(stcb); 4952 } 4953 } else { 4954 ret_buf = NULL; 4955 } 4956 if (linp != NULL) { 4957 SCTP_ASOC_CREATE_UNLOCK(linp); 4958 } 4959 if (ret_buf == NULL) { 4960 if (stcb != NULL) { 4961 SCTP_TCB_UNLOCK(stcb); 4962 } 4963 SCTPDBG(SCTP_DEBUG_INPUT3, 4964 "GAK, null buffer\n"); 4965 *offset = length; 4966 return (NULL); 4967 } 4968 /* if AUTH skipped, see if it verified... */ 4969 if (auth_skipped) { 4970 got_auth = 1; 4971 auth_skipped = 0; 4972 } 4973 /* Restart the timer if we have pending data */ 4974 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4975 if (chk->whoTo != NULL) { 4976 break; 4977 } 4978 } 4979 if (chk != NULL) { 4980 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4981 } 4982 } 4983 break; 4984 case SCTP_COOKIE_ACK: 4985 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4986 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4987 break; 4988 } 4989 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4990 /* We are not interested anymore */ 4991 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4992 ; 4993 } else if (stcb) { 4994 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4995 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4996 *offset = length; 4997 return (NULL); 4998 } 4999 } 5000 if ((netp != NULL) && (*netp != NULL)) { 5001 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 5002 } 5003 break; 5004 case SCTP_ECN_ECHO: 5005 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 5006 if (stcb == NULL) { 5007 break; 5008 } 5009 if (stcb->asoc.ecn_supported == 0) { 5010 goto unknown_chunk; 5011 } 5012 if ((chk_length != sizeof(struct sctp_ecne_chunk)) && 5013 (chk_length != sizeof(struct old_sctp_ecne_chunk))) { 5014 break; 5015 } 5016 sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb); 5017 ecne_seen = 1; 5018 break; 5019 case SCTP_ECN_CWR: 5020 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n"); 5021 if (stcb == NULL) { 5022 break; 5023 } 5024 if (stcb->asoc.ecn_supported == 0) { 5025 goto unknown_chunk; 5026 } 5027 if (chk_length != sizeof(struct sctp_cwr_chunk)) { 5028 break; 5029 } 5030 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5031 break; 5032 case SCTP_SHUTDOWN_COMPLETE: 5033 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5034 /* must be first and only chunk */ 5035 if ((num_chunks > 1) || 5036 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5037 *offset = length; 5038 return (stcb); 5039 } 5040 if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) && 5041 (stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5042 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5043 stcb, *netp); 5044 *offset = length; 5045 return (NULL); 5046 } 5047 break; 5048 case SCTP_ASCONF: 5049 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5050 if (stcb != NULL) { 5051 if (stcb->asoc.asconf_supported == 0) { 5052 goto unknown_chunk; 5053 } 5054 sctp_handle_asconf(m, *offset, src, 5055 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5056 asconf_cnt++; 5057 } 5058 break; 5059 case SCTP_ASCONF_ACK: 5060 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5061 if (stcb == NULL) { 5062 break; 5063 } 5064 if (stcb->asoc.asconf_supported == 0) { 5065 goto unknown_chunk; 5066 } 5067 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5068 break; 5069 } 5070 if ((netp != NULL) && (*netp != NULL)) { 5071 /* He's alive so give him credit */ 5072 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5073 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5074 stcb->asoc.overall_error_count, 5075 0, 5076 SCTP_FROM_SCTP_INPUT, 5077 __LINE__); 5078 } 5079 stcb->asoc.overall_error_count = 0; 5080 sctp_handle_asconf_ack(m, *offset, 5081 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5082 if (abort_no_unlock) 5083 return (NULL); 5084 } 5085 break; 5086 case SCTP_FORWARD_CUM_TSN: 5087 case SCTP_IFORWARD_CUM_TSN: 5088 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5089 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5090 if (stcb == NULL) { 5091 break; 5092 } 5093 if (stcb->asoc.prsctp_supported == 0) { 5094 goto unknown_chunk; 5095 } 5096 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5097 break; 5098 } 5099 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5100 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5101 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5102 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5103 } else { 5104 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5105 } 5106 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5107 sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 5108 *offset = length; 5109 return (NULL); 5110 } 5111 *fwd_tsn_seen = 1; 5112 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5113 /* We are not interested anymore */ 5114 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5115 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5116 *offset = length; 5117 return (NULL); 5118 } 5119 /* 5120 * For sending a SACK this looks like DATA chunks. 5121 */ 5122 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5123 abort_flag = 0; 5124 sctp_handle_forward_tsn(stcb, 5125 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5126 if (abort_flag) { 5127 *offset = length; 5128 return (NULL); 5129 } 5130 break; 5131 case SCTP_STREAM_RESET: 5132 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5133 if (stcb == NULL) { 5134 break; 5135 } 5136 if (stcb->asoc.reconfig_supported == 0) { 5137 goto unknown_chunk; 5138 } 5139 if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) { 5140 break; 5141 } 5142 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5143 /* stop processing */ 5144 *offset = length; 5145 return (NULL); 5146 } 5147 break; 5148 case SCTP_PACKET_DROPPED: 5149 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5150 if (stcb == NULL) { 5151 break; 5152 } 5153 if (stcb->asoc.pktdrop_supported == 0) { 5154 goto unknown_chunk; 5155 } 5156 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5157 break; 5158 } 5159 if ((netp != NULL) && (*netp != NULL)) { 5160 sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch, 5161 stcb, *netp, 5162 min(chk_length, contiguous)); 5163 } 5164 break; 5165 case SCTP_AUTHENTICATION: 5166 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n"); 5167 if (stcb == NULL) { 5168 /* save the first AUTH for later processing */ 5169 if (auth_skipped == 0) { 5170 auth_offset = *offset; 5171 auth_len = chk_length; 5172 auth_skipped = 1; 5173 } 5174 /* skip this chunk (temporarily) */ 5175 break; 5176 } 5177 if (stcb->asoc.auth_supported == 0) { 5178 goto unknown_chunk; 5179 } 5180 if ((chk_length < (sizeof(struct sctp_auth_chunk))) || 5181 (chk_length > (sizeof(struct sctp_auth_chunk) + 5182 SCTP_AUTH_DIGEST_LEN_MAX))) { 5183 /* Its not ours */ 5184 *offset = length; 5185 return (stcb); 5186 } 5187 if (got_auth == 1) { 5188 /* skip this chunk... it's already auth'd */ 5189 break; 5190 } 5191 got_auth = 1; 5192 if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) { 5193 /* auth HMAC failed so dump the packet */ 5194 *offset = length; 5195 return (stcb); 5196 } else { 5197 /* remaining chunks are HMAC checked */ 5198 stcb->asoc.authenticated = 1; 5199 } 5200 break; 5201 5202 default: 5203 unknown_chunk: 5204 /* it's an unknown chunk! */ 5205 if ((ch->chunk_type & 0x40) && 5206 (stcb != NULL) && 5207 (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) && 5208 (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) && 5209 (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) { 5210 struct sctp_gen_error_cause *cause; 5211 int len; 5212 5213 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause), 5214 0, M_NOWAIT, 1, MT_DATA); 5215 if (op_err != NULL) { 5216 len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset)); 5217 cause = mtod(op_err, struct sctp_gen_error_cause *); 5218 cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK); 5219 cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause))); 5220 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause); 5221 SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT); 5222 if (SCTP_BUF_NEXT(op_err) != NULL) { 5223 #ifdef SCTP_MBUF_LOGGING 5224 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5225 sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY); 5226 } 5227 #endif 5228 sctp_queue_op_err(stcb, op_err); 5229 } else { 5230 sctp_m_freem(op_err); 5231 } 5232 } 5233 } 5234 if ((ch->chunk_type & 0x80) == 0) { 5235 /* discard this packet */ 5236 *offset = length; 5237 return (stcb); 5238 } /* else skip this bad chunk and continue... */ 5239 break; 5240 } /* switch (ch->chunk_type) */ 5241 5242 next_chunk: 5243 /* get the next chunk */ 5244 *offset += SCTP_SIZE32(chk_length); 5245 if (*offset >= length) { 5246 /* no more data left in the mbuf chain */ 5247 break; 5248 } 5249 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 5250 sizeof(struct sctp_chunkhdr), chunk_buf); 5251 if (ch == NULL) { 5252 *offset = length; 5253 return (stcb); 5254 } 5255 } /* while */ 5256 5257 if ((asconf_cnt > 0) && (stcb != NULL)) { 5258 sctp_send_asconf_ack(stcb); 5259 } 5260 return (stcb); 5261 } 5262 5263 /* 5264 * common input chunk processing (v4 and v6) 5265 */ 5266 void 5267 sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length, 5268 struct sockaddr *src, struct sockaddr *dst, 5269 struct sctphdr *sh, struct sctp_chunkhdr *ch, 5270 uint8_t compute_crc, 5271 uint8_t ecn_bits, 5272 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 5273 uint32_t vrf_id, uint16_t port) 5274 { 5275 char msg[SCTP_DIAG_INFO_LEN]; 5276 struct mbuf *m = *mm, *op_err; 5277 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5278 struct sctp_tcb *stcb = NULL; 5279 struct sctp_nets *net = NULL; 5280 uint32_t high_tsn; 5281 uint32_t cksum_in_hdr; 5282 int un_sent; 5283 int cnt_ctrl_ready = 0; 5284 int fwd_tsn_seen = 0, data_processed = 0; 5285 bool cksum_validated, stcb_looked_up; 5286 5287 SCTP_STAT_INCR(sctps_recvdatagrams); 5288 #ifdef SCTP_AUDITING_ENABLED 5289 sctp_audit_log(0xE0, 1); 5290 sctp_auditing(0, inp, stcb, net); 5291 #endif 5292 5293 stcb_looked_up = false; 5294 if (compute_crc != 0) { 5295 cksum_validated = false; 5296 cksum_in_hdr = sh->checksum; 5297 if (cksum_in_hdr != htonl(0)) { 5298 uint32_t cksum_calculated; 5299 5300 validate_cksum: 5301 sh->checksum = 0; 5302 cksum_calculated = sctp_calculate_cksum(m, iphlen); 5303 sh->checksum = cksum_in_hdr; 5304 if (cksum_calculated != cksum_in_hdr) { 5305 if (stcb_looked_up) { 5306 /* 5307 * The packet has a zero checksum, 5308 * which is not the correct CRC, no 5309 * stcb has been found or an stcb 5310 * has been found but an incorrect 5311 * zero checksum is not acceptable. 5312 */ 5313 KASSERT(cksum_in_hdr == htonl(0), 5314 ("cksum in header not zero: %x", 5315 ntohl(cksum_in_hdr))); 5316 if ((inp == NULL) && 5317 (SCTP_BASE_SYSCTL(sctp_ootb_with_zero_cksum) == 1)) { 5318 /* 5319 * This is an OOTB packet, 5320 * depending on the sysctl 5321 * variable, pretend that 5322 * the checksum is 5323 * acceptable, to allow an 5324 * appropriate response 5325 * (ABORT, for examlpe) to 5326 * be sent. 5327 */ 5328 KASSERT(stcb == NULL, 5329 ("stcb is %p", stcb)); 5330 SCTP_STAT_INCR(sctps_recvzerocrc); 5331 goto cksum_validated; 5332 } 5333 } else { 5334 stcb = sctp_findassociation_addr(m, offset, src, dst, 5335 sh, ch, &inp, &net, vrf_id); 5336 } 5337 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad cksum in SCTP packet:%x calculated:%x m:%p mlen:%d iphlen:%d\n", 5338 ntohl(cksum_in_hdr), ntohl(cksum_calculated), (void *)m, length, iphlen); 5339 #if defined(INET) || defined(INET6) 5340 if ((ch->chunk_type != SCTP_INITIATION) && 5341 (net != NULL) && (net->port != port)) { 5342 if (net->port == 0) { 5343 /* 5344 * UDP encapsulation turned 5345 * on. 5346 */ 5347 net->mtu -= sizeof(struct udphdr); 5348 if (stcb->asoc.smallest_mtu > net->mtu) { 5349 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5350 } 5351 } else if (port == 0) { 5352 /* 5353 * UDP encapsulation turned 5354 * off. 5355 */ 5356 net->mtu += sizeof(struct udphdr); 5357 /* XXX Update smallest_mtu */ 5358 } 5359 net->port = port; 5360 } 5361 #endif 5362 if (net != NULL) { 5363 net->flowtype = mflowtype; 5364 net->flowid = mflowid; 5365 } 5366 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5367 if ((inp != NULL) && (stcb != NULL)) { 5368 if (stcb->asoc.pktdrop_supported) { 5369 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5370 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5371 } 5372 } else if ((inp != NULL) && (stcb == NULL)) { 5373 inp_decr = inp; 5374 } 5375 SCTP_STAT_INCR(sctps_badsum); 5376 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5377 goto out; 5378 } else { 5379 cksum_validated = true; 5380 } 5381 } 5382 KASSERT(cksum_validated || cksum_in_hdr == htonl(0), 5383 ("cksum 0x%08x not zero and not validated", ntohl(cksum_in_hdr))); 5384 if (!cksum_validated) { 5385 stcb = sctp_findassociation_addr(m, offset, src, dst, 5386 sh, ch, &inp, &net, vrf_id); 5387 stcb_looked_up = true; 5388 if ((stcb == NULL) || (stcb->asoc.zero_checksum == 0)) { 5389 goto validate_cksum; 5390 } 5391 SCTP_STAT_INCR(sctps_recvzerocrc); 5392 } 5393 } 5394 cksum_validated: 5395 /* Destination port of 0 is illegal, based on RFC4960. */ 5396 if (sh->dest_port == htons(0)) { 5397 SCTP_STAT_INCR(sctps_hdrops); 5398 if ((stcb == NULL) && (inp != NULL)) { 5399 inp_decr = inp; 5400 } 5401 goto out; 5402 } 5403 if (!stcb_looked_up) { 5404 stcb = sctp_findassociation_addr(m, offset, src, dst, 5405 sh, ch, &inp, &net, vrf_id); 5406 } 5407 #if defined(INET) || defined(INET6) 5408 if ((ch->chunk_type != SCTP_INITIATION) && 5409 (net != NULL) && (net->port != port)) { 5410 if (net->port == 0) { 5411 /* UDP encapsulation turned on. */ 5412 net->mtu -= sizeof(struct udphdr); 5413 if (stcb->asoc.smallest_mtu > net->mtu) { 5414 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5415 } 5416 } else if (port == 0) { 5417 /* UDP encapsulation turned off. */ 5418 net->mtu += sizeof(struct udphdr); 5419 /* XXX Update smallest_mtu */ 5420 } 5421 net->port = port; 5422 } 5423 #endif 5424 if (net != NULL) { 5425 net->flowtype = mflowtype; 5426 net->flowid = mflowid; 5427 } 5428 if (inp == NULL) { 5429 SCTP_STAT_INCR(sctps_noport); 5430 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5431 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5432 goto out; 5433 } 5434 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5435 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5436 sctp_send_shutdown_complete2(src, dst, sh, 5437 mflowtype, mflowid, fibnum, 5438 vrf_id, port); 5439 goto out; 5440 } 5441 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5442 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5443 goto out; 5444 } 5445 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5446 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5447 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5448 (ch->chunk_type != SCTP_INIT))) { 5449 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5450 "Out of the blue"); 5451 sctp_send_abort(m, iphlen, src, dst, 5452 sh, 0, op_err, 5453 mflowtype, mflowid, fibnum, 5454 vrf_id, port); 5455 } 5456 } 5457 goto out; 5458 } else if (stcb == NULL) { 5459 inp_decr = inp; 5460 } 5461 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5462 (void *)m, iphlen, offset, length, (void *)stcb); 5463 if (stcb) { 5464 /* always clear this before beginning a packet */ 5465 stcb->asoc.authenticated = 0; 5466 stcb->asoc.seen_a_sack_this_pkt = 0; 5467 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5468 (void *)stcb, stcb->asoc.state); 5469 5470 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5471 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5472 /*- 5473 * If we hit here, we had a ref count 5474 * up when the assoc was aborted and the 5475 * timer is clearing out the assoc, we should 5476 * NOT respond to any packet.. its OOTB. 5477 */ 5478 SCTP_TCB_UNLOCK(stcb); 5479 stcb = NULL; 5480 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5481 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5482 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5483 msg); 5484 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5485 mflowtype, mflowid, inp->fibnum, 5486 vrf_id, port); 5487 goto out; 5488 } 5489 } 5490 if (IS_SCTP_CONTROL(ch)) { 5491 /* process the control portion of the SCTP packet */ 5492 /* sa_ignore NO_NULL_CHK */ 5493 stcb = sctp_process_control(m, iphlen, &offset, length, 5494 src, dst, sh, ch, 5495 inp, stcb, &net, &fwd_tsn_seen, 5496 mflowtype, mflowid, fibnum, 5497 vrf_id, port); 5498 if (stcb) { 5499 /* 5500 * This covers us if the cookie-echo was there and 5501 * it changes our INP. 5502 */ 5503 inp = stcb->sctp_ep; 5504 #if defined(INET) || defined(INET6) 5505 if ((ch->chunk_type != SCTP_INITIATION) && 5506 (net != NULL) && (net->port != port)) { 5507 if (net->port == 0) { 5508 /* UDP encapsulation turned on. */ 5509 net->mtu -= sizeof(struct udphdr); 5510 if (stcb->asoc.smallest_mtu > net->mtu) { 5511 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5512 } 5513 } else if (port == 0) { 5514 /* UDP encapsulation turned off. */ 5515 net->mtu += sizeof(struct udphdr); 5516 /* XXX Update smallest_mtu */ 5517 } 5518 net->port = port; 5519 } 5520 #endif 5521 } 5522 } else { 5523 /* 5524 * no control chunks, so pre-process DATA chunks (these 5525 * checks are taken care of by control processing) 5526 */ 5527 5528 /* 5529 * if DATA only packet, and auth is required, then punt... 5530 * can't have authenticated without any AUTH (control) 5531 * chunks 5532 */ 5533 if ((stcb != NULL) && 5534 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5535 /* "silently" ignore */ 5536 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5537 SCTP_STAT_INCR(sctps_recvauthmissing); 5538 goto out; 5539 } 5540 if (stcb == NULL) { 5541 /* out of the blue DATA chunk */ 5542 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5543 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5544 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5545 msg); 5546 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5547 mflowtype, mflowid, fibnum, 5548 vrf_id, port); 5549 goto out; 5550 } 5551 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5552 /* v_tag mismatch! */ 5553 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5554 SCTP_STAT_INCR(sctps_badvtag); 5555 goto out; 5556 } 5557 } 5558 5559 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5560 if (stcb == NULL) { 5561 /* 5562 * no valid TCB for this packet, or we found it's a bad 5563 * packet while processing control, or we're done with this 5564 * packet (done or skip rest of data), so we drop it... 5565 */ 5566 goto out; 5567 } 5568 5569 /* 5570 * DATA chunk processing 5571 */ 5572 /* plow through the data chunks while length > offset */ 5573 5574 /* 5575 * Rest should be DATA only. Check authentication state if AUTH for 5576 * DATA is required. 5577 */ 5578 if ((length > offset) && 5579 (stcb != NULL) && 5580 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5581 !stcb->asoc.authenticated) { 5582 /* "silently" ignore */ 5583 SCTP_STAT_INCR(sctps_recvauthmissing); 5584 SCTPDBG(SCTP_DEBUG_AUTH1, 5585 "Data chunk requires AUTH, skipped\n"); 5586 goto trigger_send; 5587 } 5588 if (length > offset) { 5589 int retval; 5590 5591 /* 5592 * First check to make sure our state is correct. We would 5593 * not get here unless we really did have a tag, so we don't 5594 * abort if this happens, just dump the chunk silently. 5595 */ 5596 switch (SCTP_GET_STATE(stcb)) { 5597 case SCTP_STATE_COOKIE_ECHOED: 5598 /* 5599 * we consider data with valid tags in this state 5600 * shows us the cookie-ack was lost. Imply it was 5601 * there. 5602 */ 5603 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5604 break; 5605 case SCTP_STATE_COOKIE_WAIT: 5606 /* 5607 * We consider OOTB any data sent during asoc setup. 5608 */ 5609 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5610 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5611 msg); 5612 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5613 mflowtype, mflowid, inp->fibnum, 5614 vrf_id, port); 5615 goto out; 5616 /* sa_ignore NOTREACHED */ 5617 break; 5618 case SCTP_STATE_EMPTY: /* should not happen */ 5619 case SCTP_STATE_INUSE: /* should not happen */ 5620 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5621 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5622 default: 5623 goto out; 5624 /* sa_ignore NOTREACHED */ 5625 break; 5626 case SCTP_STATE_OPEN: 5627 case SCTP_STATE_SHUTDOWN_SENT: 5628 break; 5629 } 5630 /* plow through the data chunks while length > offset */ 5631 retval = sctp_process_data(mm, iphlen, &offset, length, 5632 inp, stcb, net, &high_tsn); 5633 if (retval == 2) { 5634 /* 5635 * The association aborted, NO UNLOCK needed since 5636 * the association is destroyed. 5637 */ 5638 stcb = NULL; 5639 goto out; 5640 } 5641 if (retval == 0) { 5642 data_processed = 1; 5643 } 5644 /* 5645 * Anything important needs to have been m_copy'ed in 5646 * process_data 5647 */ 5648 } 5649 5650 /* take care of ecn */ 5651 if ((data_processed == 1) && 5652 (stcb->asoc.ecn_supported == 1) && 5653 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5654 /* Yep, we need to add a ECNE */ 5655 sctp_send_ecn_echo(stcb, net, high_tsn); 5656 } 5657 5658 if ((data_processed == 0) && (fwd_tsn_seen)) { 5659 int was_a_gap; 5660 uint32_t highest_tsn; 5661 5662 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5663 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5664 } else { 5665 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5666 } 5667 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5668 stcb->asoc.send_sack = 1; 5669 sctp_sack_check(stcb, was_a_gap); 5670 } else if (fwd_tsn_seen) { 5671 stcb->asoc.send_sack = 1; 5672 } 5673 /* trigger send of any chunks in queue... */ 5674 trigger_send: 5675 #ifdef SCTP_AUDITING_ENABLED 5676 sctp_audit_log(0xE0, 2); 5677 sctp_auditing(1, inp, stcb, net); 5678 #endif 5679 SCTPDBG(SCTP_DEBUG_INPUT1, 5680 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5681 stcb->asoc.peers_rwnd, 5682 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5683 stcb->asoc.total_flight); 5684 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5685 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5686 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5687 } 5688 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5689 cnt_ctrl_ready || 5690 stcb->asoc.trigger_reset || 5691 ((un_sent > 0) && 5692 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5693 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5694 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5695 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5696 } 5697 #ifdef SCTP_AUDITING_ENABLED 5698 sctp_audit_log(0xE0, 3); 5699 sctp_auditing(2, inp, stcb, net); 5700 #endif 5701 out: 5702 if (stcb != NULL) { 5703 SCTP_TCB_UNLOCK(stcb); 5704 } 5705 if (inp_decr != NULL) { 5706 /* reduce ref-count */ 5707 SCTP_INP_WLOCK(inp_decr); 5708 SCTP_INP_DECR_REF(inp_decr); 5709 SCTP_INP_WUNLOCK(inp_decr); 5710 } 5711 return; 5712 } 5713 5714 #ifdef INET 5715 void 5716 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5717 { 5718 struct mbuf *m; 5719 int iphlen; 5720 uint32_t vrf_id = 0; 5721 uint8_t ecn_bits; 5722 struct sockaddr_in src, dst; 5723 struct ip *ip; 5724 struct sctphdr *sh; 5725 struct sctp_chunkhdr *ch; 5726 int length, offset; 5727 uint8_t compute_crc; 5728 uint32_t mflowid; 5729 uint8_t mflowtype; 5730 uint16_t fibnum; 5731 5732 iphlen = off; 5733 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5734 SCTP_RELEASE_PKT(i_pak); 5735 return; 5736 } 5737 m = SCTP_HEADER_TO_CHAIN(i_pak); 5738 #ifdef SCTP_MBUF_LOGGING 5739 /* Log in any input mbufs */ 5740 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5741 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5742 } 5743 #endif 5744 #ifdef SCTP_PACKET_LOGGING 5745 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5746 sctp_packet_log(m); 5747 } 5748 #endif 5749 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5750 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5751 m->m_pkthdr.len, 5752 if_name(m->m_pkthdr.rcvif), 5753 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5754 mflowid = m->m_pkthdr.flowid; 5755 mflowtype = M_HASHTYPE_GET(m); 5756 fibnum = M_GETFIB(m); 5757 SCTP_STAT_INCR(sctps_recvpackets); 5758 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5759 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5760 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5761 if (SCTP_BUF_LEN(m) < offset) { 5762 if ((m = m_pullup(m, offset)) == NULL) { 5763 SCTP_STAT_INCR(sctps_hdrops); 5764 return; 5765 } 5766 } 5767 ip = mtod(m, struct ip *); 5768 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5769 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5770 offset -= sizeof(struct sctp_chunkhdr); 5771 memset(&src, 0, sizeof(struct sockaddr_in)); 5772 src.sin_family = AF_INET; 5773 src.sin_len = sizeof(struct sockaddr_in); 5774 src.sin_port = sh->src_port; 5775 src.sin_addr = ip->ip_src; 5776 memset(&dst, 0, sizeof(struct sockaddr_in)); 5777 dst.sin_family = AF_INET; 5778 dst.sin_len = sizeof(struct sockaddr_in); 5779 dst.sin_port = sh->dest_port; 5780 dst.sin_addr = ip->ip_dst; 5781 length = ntohs(ip->ip_len); 5782 /* Validate mbuf chain length with IP payload length. */ 5783 if (SCTP_HEADER_LEN(m) != length) { 5784 SCTPDBG(SCTP_DEBUG_INPUT1, 5785 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5786 SCTP_STAT_INCR(sctps_hdrops); 5787 goto out; 5788 } 5789 /* SCTP does not allow broadcasts or multicasts */ 5790 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5791 goto out; 5792 } 5793 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5794 goto out; 5795 } 5796 ecn_bits = ip->ip_tos; 5797 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5798 SCTP_STAT_INCR(sctps_recvhwcrc); 5799 compute_crc = 0; 5800 } else { 5801 SCTP_STAT_INCR(sctps_recvswcrc); 5802 compute_crc = 1; 5803 } 5804 sctp_common_input_processing(&m, iphlen, offset, length, 5805 (struct sockaddr *)&src, 5806 (struct sockaddr *)&dst, 5807 sh, ch, 5808 compute_crc, 5809 ecn_bits, 5810 mflowtype, mflowid, fibnum, 5811 vrf_id, port); 5812 out: 5813 if (m) { 5814 sctp_m_freem(m); 5815 } 5816 return; 5817 } 5818 5819 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5820 extern int *sctp_cpuarry; 5821 #endif 5822 5823 int 5824 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5825 { 5826 struct mbuf *m; 5827 int off; 5828 5829 m = *mp; 5830 off = *offp; 5831 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5832 if (mp_ncpus > 1) { 5833 struct ip *ip; 5834 struct sctphdr *sh; 5835 int offset; 5836 int cpu_to_use; 5837 uint32_t flowid, tag; 5838 5839 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5840 flowid = m->m_pkthdr.flowid; 5841 } else { 5842 /* 5843 * No flow id built by lower layers fix it so we 5844 * create one. 5845 */ 5846 offset = off + sizeof(struct sctphdr); 5847 if (SCTP_BUF_LEN(m) < offset) { 5848 if ((m = m_pullup(m, offset)) == NULL) { 5849 SCTP_STAT_INCR(sctps_hdrops); 5850 return (IPPROTO_DONE); 5851 } 5852 } 5853 ip = mtod(m, struct ip *); 5854 sh = (struct sctphdr *)((caddr_t)ip + off); 5855 tag = htonl(sh->v_tag); 5856 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5857 m->m_pkthdr.flowid = flowid; 5858 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5859 } 5860 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5861 sctp_queue_to_mcore(m, off, cpu_to_use); 5862 return (IPPROTO_DONE); 5863 } 5864 #endif 5865 sctp_input_with_port(m, off, 0); 5866 return (IPPROTO_DONE); 5867 } 5868 #endif 5869