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