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 <netinet/sctp_os.h> 36 #include <netinet/sctp_var.h> 37 #include <netinet/sctp_sysctl.h> 38 #include <netinet/sctp_pcb.h> 39 #include <netinet/sctp_header.h> 40 #include <netinet/sctputil.h> 41 #include <netinet/sctp_output.h> 42 #include <netinet/sctp_input.h> 43 #include <netinet/sctp_auth.h> 44 #include <netinet/sctp_indata.h> 45 #include <netinet/sctp_asconf.h> 46 #include <netinet/sctp_bsd_addr.h> 47 #include <netinet/sctp_timer.h> 48 #include <netinet/sctp_crc32.h> 49 #include <netinet/sctp_kdtrace.h> 50 #if defined(INET) || defined(INET6) 51 #include <netinet/udp.h> 52 #endif 53 #include <sys/smp.h> 54 55 static void 56 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 57 { 58 struct sctp_nets *net; 59 60 /* 61 * This now not only stops all cookie timers it also stops any INIT 62 * timers as well. This will make sure that the timers are stopped 63 * in all collision cases. 64 */ 65 SCTP_TCB_LOCK_ASSERT(stcb); 66 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 67 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 68 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 69 stcb->sctp_ep, 70 stcb, 71 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 72 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 73 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 74 stcb->sctp_ep, 75 stcb, 76 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 77 } 78 } 79 } 80 81 /* INIT handler */ 82 static void 83 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 84 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 85 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 86 struct sctp_tcb *stcb, struct sctp_nets *net, 87 uint8_t mflowtype, uint32_t mflowid, 88 uint32_t vrf_id, uint16_t port) 89 { 90 struct sctp_init *init; 91 struct mbuf *op_err; 92 93 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 94 (void *)stcb); 95 if (stcb == NULL) { 96 SCTP_INP_RLOCK(inp); 97 } 98 /* Validate parameters */ 99 init = &cp->init; 100 if (ntohl(init->initiate_tag) == 0) { 101 goto outnow; 102 } 103 if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) || 104 (ntohs(init->num_inbound_streams) == 0) || 105 (ntohs(init->num_outbound_streams) == 0)) { 106 /* protocol error... send abort */ 107 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 108 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 109 mflowtype, mflowid, inp->fibnum, 110 vrf_id, port); 111 goto outnow; 112 } 113 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 114 offset + ntohs(cp->ch.chunk_length))) { 115 /* auth parameter(s) error... send abort */ 116 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 117 "Problem with AUTH parameters"); 118 sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err, 119 mflowtype, mflowid, inp->fibnum, 120 vrf_id, port); 121 goto outnow; 122 } 123 /* We are only accepting if we have a listening socket. */ 124 if ((stcb == NULL) && 125 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 126 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 127 (!SCTP_IS_LISTENING(inp)))) { 128 /* 129 * FIX ME ?? What about TCP model and we have a 130 * match/restart case? Actually no fix is needed. the lookup 131 * will always find the existing assoc so stcb would not be 132 * NULL. It may be questionable to do this since we COULD 133 * just send back the INIT-ACK and hope that the app did 134 * accept()'s by the time the COOKIE was sent. But there is 135 * a price to pay for COOKIE generation and I don't want to 136 * pay it on the chance that the app will actually do some 137 * accepts(). The App just looses and should NOT be in this 138 * state :-) 139 */ 140 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 141 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 142 "No listener"); 143 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 144 mflowtype, mflowid, inp->fibnum, 145 vrf_id, port); 146 } 147 goto outnow; 148 } 149 if ((stcb != NULL) && 150 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 151 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 152 sctp_send_shutdown_ack(stcb, NULL); 153 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 154 } else { 155 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 156 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 157 src, dst, sh, cp, 158 mflowtype, mflowid, 159 vrf_id, port); 160 } 161 outnow: 162 if (stcb == NULL) { 163 SCTP_INP_RUNLOCK(inp); 164 } 165 } 166 167 /* 168 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 169 */ 170 171 int 172 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 173 { 174 int unsent_data; 175 unsigned int i; 176 struct sctp_stream_queue_pending *sp; 177 struct sctp_association *asoc; 178 179 SCTP_TCB_LOCK_ASSERT(stcb); 180 181 /* 182 * This function returns if any stream has true unsent data on it. 183 * Note that as it looks through it will clean up any places that 184 * have old data that has been sent but left at top of stream queue. 185 */ 186 asoc = &stcb->asoc; 187 unsent_data = 0; 188 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 189 /* Check to see if some data queued */ 190 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 191 /* sa_ignore FREED_MEMORY */ 192 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 193 if (sp == NULL) { 194 continue; 195 } 196 if ((sp->msg_is_complete) && 197 (sp->length == 0) && 198 (sp->sender_all_done)) { 199 /* 200 * We are doing differed cleanup. Last time 201 * through when we took all the data the 202 * sender_all_done was not set. 203 */ 204 if (sp->put_last_out == 0) { 205 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 206 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 207 sp->sender_all_done, 208 sp->length, 209 sp->msg_is_complete, 210 sp->put_last_out); 211 } 212 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 213 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 214 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp); 215 if (sp->net) { 216 sctp_free_remote_addr(sp->net); 217 sp->net = NULL; 218 } 219 if (sp->data) { 220 sctp_m_freem(sp->data); 221 sp->data = NULL; 222 } 223 sctp_free_a_strmoq(stcb, sp, so_locked); 224 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 225 unsent_data++; 226 } 227 } else { 228 unsent_data++; 229 } 230 if (unsent_data > 0) { 231 break; 232 } 233 } 234 } 235 return (unsent_data); 236 } 237 238 static int 239 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 240 { 241 struct sctp_init *init; 242 struct sctp_association *asoc; 243 struct sctp_nets *lnet; 244 unsigned int i; 245 246 SCTP_TCB_LOCK_ASSERT(stcb); 247 248 init = &cp->init; 249 asoc = &stcb->asoc; 250 /* save off parameters */ 251 asoc->peer_vtag = ntohl(init->initiate_tag); 252 asoc->peers_rwnd = ntohl(init->a_rwnd); 253 /* init tsn's */ 254 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 255 256 if (!TAILQ_EMPTY(&asoc->nets)) { 257 /* update any ssthresh's that may have a default */ 258 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 259 lnet->ssthresh = asoc->peers_rwnd; 260 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 261 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 262 } 263 } 264 } 265 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 266 unsigned int newcnt; 267 struct sctp_stream_out *outs; 268 struct sctp_stream_queue_pending *sp, *nsp; 269 struct sctp_tmit_chunk *chk, *nchk; 270 271 /* abandon the upper streams */ 272 newcnt = ntohs(init->num_inbound_streams); 273 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 274 if (chk->rec.data.sid >= newcnt) { 275 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 276 asoc->send_queue_cnt--; 277 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 278 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 279 #ifdef INVARIANTS 280 } else { 281 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 282 #endif 283 } 284 if (chk->data != NULL) { 285 sctp_free_bufspace(stcb, asoc, chk, 1); 286 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 287 0, chk, SCTP_SO_NOT_LOCKED); 288 if (chk->data) { 289 sctp_m_freem(chk->data); 290 chk->data = NULL; 291 } 292 } 293 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 294 /* sa_ignore FREED_MEMORY */ 295 } 296 } 297 if (asoc->strmout) { 298 for (i = newcnt; i < asoc->pre_open_streams; i++) { 299 outs = &asoc->strmout[i]; 300 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 301 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 302 TAILQ_REMOVE(&outs->outqueue, sp, next); 303 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp); 304 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 305 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 306 if (sp->data) { 307 sctp_m_freem(sp->data); 308 sp->data = NULL; 309 } 310 if (sp->net) { 311 sctp_free_remote_addr(sp->net); 312 sp->net = NULL; 313 } 314 /* Free the chunk */ 315 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 316 /* sa_ignore FREED_MEMORY */ 317 } 318 outs->state = SCTP_STREAM_CLOSED; 319 } 320 } 321 /* cut back the count */ 322 asoc->pre_open_streams = newcnt; 323 } 324 asoc->streamoutcnt = asoc->pre_open_streams; 325 if (asoc->strmout) { 326 for (i = 0; i < asoc->streamoutcnt; i++) { 327 asoc->strmout[i].state = SCTP_STREAM_OPEN; 328 } 329 } 330 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 331 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 332 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 333 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 334 } 335 /* This is the next one we expect */ 336 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 337 338 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 339 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 340 341 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 342 /* open the requested streams */ 343 344 if (asoc->strmin != NULL) { 345 /* Free the old ones */ 346 for (i = 0; i < asoc->streamincnt; i++) { 347 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 348 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 349 } 350 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 351 } 352 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 353 asoc->streamincnt = ntohs(init->num_outbound_streams); 354 } else { 355 asoc->streamincnt = asoc->max_inbound_streams; 356 } 357 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 358 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 359 if (asoc->strmin == NULL) { 360 /* we didn't get memory for the streams! */ 361 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 362 return (-1); 363 } 364 for (i = 0; i < asoc->streamincnt; i++) { 365 asoc->strmin[i].sid = i; 366 asoc->strmin[i].last_mid_delivered = 0xffffffff; 367 TAILQ_INIT(&asoc->strmin[i].inqueue); 368 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 369 asoc->strmin[i].pd_api_started = 0; 370 asoc->strmin[i].delivery_started = 0; 371 } 372 /* 373 * load_address_from_init will put the addresses into the 374 * association when the COOKIE is processed or the INIT-ACK is 375 * processed. Both types of COOKIE's existing and new call this 376 * routine. It will remove addresses that are no longer in the 377 * association (for the restarting case where addresses are 378 * removed). Up front when the INIT arrives we will discard it if it 379 * is a restart and new addresses have been added. 380 */ 381 /* sa_ignore MEMLEAK */ 382 return (0); 383 } 384 385 /* 386 * INIT-ACK message processing/consumption returns value < 0 on error 387 */ 388 static int 389 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 390 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 391 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 392 struct sctp_nets *net, int *abort_no_unlock, 393 uint8_t mflowtype, uint32_t mflowid, 394 uint32_t vrf_id) 395 { 396 struct sctp_association *asoc; 397 struct mbuf *op_err; 398 int retval, abort_flag, cookie_found; 399 int initack_limit; 400 int nat_friendly = 0; 401 402 /* First verify that we have no illegal param's */ 403 abort_flag = 0; 404 cookie_found = 0; 405 406 op_err = sctp_arethere_unrecognized_parameters(m, 407 (offset + sizeof(struct sctp_init_chunk)), 408 &abort_flag, (struct sctp_chunkhdr *)cp, 409 &nat_friendly, &cookie_found, NULL); 410 if (abort_flag) { 411 /* Send an abort and notify peer */ 412 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 413 src, dst, sh, op_err, 414 mflowtype, mflowid, 415 vrf_id, net->port); 416 *abort_no_unlock = 1; 417 return (-1); 418 } 419 if (!cookie_found) { 420 uint16_t len; 421 422 /* Only report the missing cookie parameter */ 423 if (op_err != NULL) { 424 sctp_m_freem(op_err); 425 } 426 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 427 /* We abort with an error of missing mandatory param */ 428 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 429 if (op_err != NULL) { 430 struct sctp_error_missing_param *cause; 431 432 SCTP_BUF_LEN(op_err) = len; 433 cause = mtod(op_err, struct sctp_error_missing_param *); 434 /* Subtract the reserved param */ 435 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 436 cause->cause.length = htons(len); 437 cause->num_missing_params = htonl(1); 438 cause->type[0] = htons(SCTP_STATE_COOKIE); 439 } 440 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 441 src, dst, sh, op_err, 442 mflowtype, mflowid, 443 vrf_id, net->port); 444 *abort_no_unlock = 1; 445 return (-3); 446 } 447 asoc = &stcb->asoc; 448 asoc->peer_supports_nat = (uint8_t)nat_friendly; 449 /* process the peer's parameters in the INIT-ACK */ 450 if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) { 451 if (op_err != NULL) { 452 sctp_m_freem(op_err); 453 } 454 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 455 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 456 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 457 src, dst, sh, op_err, 458 mflowtype, mflowid, 459 vrf_id, net->port); 460 *abort_no_unlock = 1; 461 return (-1); 462 } 463 initack_limit = offset + ntohs(cp->ch.chunk_length); 464 /* load all addresses */ 465 if ((retval = sctp_load_addresses_from_init(stcb, m, 466 offset + sizeof(struct sctp_init_chunk), 467 initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) { 468 if (op_err != NULL) { 469 sctp_m_freem(op_err); 470 } 471 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 472 "Problem with address parameters"); 473 SCTPDBG(SCTP_DEBUG_INPUT1, 474 "Load addresses from INIT causes an abort %d\n", 475 retval); 476 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 477 src, dst, sh, op_err, 478 mflowtype, mflowid, 479 vrf_id, net->port); 480 *abort_no_unlock = 1; 481 return (-1); 482 } 483 /* if the peer doesn't support asconf, flush the asconf queue */ 484 if (asoc->asconf_supported == 0) { 485 struct sctp_asconf_addr *param, *nparam; 486 487 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 488 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 489 SCTP_FREE(param, SCTP_M_ASC_ADDR); 490 } 491 } 492 493 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 494 stcb->asoc.local_hmacs); 495 if (op_err) { 496 sctp_queue_op_err(stcb, op_err); 497 /* queuing will steal away the mbuf chain to the out queue */ 498 op_err = NULL; 499 } 500 /* extract the cookie and queue it to "echo" it back... */ 501 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 502 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 503 stcb->asoc.overall_error_count, 504 0, 505 SCTP_FROM_SCTP_INPUT, 506 __LINE__); 507 } 508 509 /* 510 * Cancel the INIT timer, We do this first before queueing the 511 * cookie. We always cancel at the primary to assume that we are 512 * canceling the timer started by the INIT which always goes to the 513 * primary. 514 */ 515 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 516 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 517 518 /* calculate the RTO */ 519 if (asoc->overall_error_count == 0) { 520 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 521 SCTP_RTT_FROM_NON_DATA); 522 } 523 stcb->asoc.overall_error_count = 0; 524 net->error_count = 0; 525 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 526 return (retval); 527 } 528 529 static void 530 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 531 struct sctp_tcb *stcb, struct sctp_nets *net) 532 { 533 union sctp_sockstore store; 534 struct sctp_nets *r_net, *f_net; 535 struct timeval tv; 536 int req_prim = 0; 537 uint16_t old_error_counter; 538 539 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 540 /* Invalid length */ 541 return; 542 } 543 544 memset(&store, 0, sizeof(store)); 545 switch (cp->heartbeat.hb_info.addr_family) { 546 #ifdef INET 547 case AF_INET: 548 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 549 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 550 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 551 store.sin.sin_port = stcb->rport; 552 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 553 sizeof(store.sin.sin_addr)); 554 } else { 555 return; 556 } 557 break; 558 #endif 559 #ifdef INET6 560 case AF_INET6: 561 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 562 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 563 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 564 store.sin6.sin6_port = stcb->rport; 565 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 566 } else { 567 return; 568 } 569 break; 570 #endif 571 default: 572 return; 573 } 574 r_net = sctp_findnet(stcb, &store.sa); 575 if (r_net == NULL) { 576 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 577 return; 578 } 579 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 580 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 581 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 582 /* 583 * If the its a HB and it's random value is correct when can 584 * confirm the destination. 585 */ 586 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 587 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 588 stcb->asoc.primary_destination = r_net; 589 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 590 f_net = TAILQ_FIRST(&stcb->asoc.nets); 591 if (f_net != r_net) { 592 /* 593 * first one on the list is NOT the primary 594 * sctp_cmpaddr() is much more efficient if 595 * the primary is the first on the list, 596 * make it so. 597 */ 598 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 599 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 600 } 601 req_prim = 1; 602 } 603 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 604 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 605 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 606 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 607 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 608 } 609 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 610 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 611 stcb->asoc.overall_error_count, 612 0, 613 SCTP_FROM_SCTP_INPUT, 614 __LINE__); 615 } 616 stcb->asoc.overall_error_count = 0; 617 old_error_counter = r_net->error_count; 618 r_net->error_count = 0; 619 r_net->hb_responded = 1; 620 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 621 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 622 /* Now lets do a RTO with this */ 623 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 624 SCTP_RTT_FROM_NON_DATA); 625 if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) { 626 r_net->dest_state |= SCTP_ADDR_REACHABLE; 627 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 628 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 629 } 630 if (r_net->dest_state & SCTP_ADDR_PF) { 631 r_net->dest_state &= ~SCTP_ADDR_PF; 632 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 633 } 634 if (old_error_counter > 0) { 635 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 636 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 637 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 638 } 639 if (r_net == stcb->asoc.primary_destination) { 640 if (stcb->asoc.alternate) { 641 /* release the alternate, primary is good */ 642 sctp_free_remote_addr(stcb->asoc.alternate); 643 stcb->asoc.alternate = NULL; 644 } 645 } 646 /* Mobility adaptation */ 647 if (req_prim) { 648 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 649 SCTP_MOBILITY_BASE) || 650 sctp_is_mobility_feature_on(stcb->sctp_ep, 651 SCTP_MOBILITY_FASTHANDOFF)) && 652 sctp_is_mobility_feature_on(stcb->sctp_ep, 653 SCTP_MOBILITY_PRIM_DELETED)) { 654 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 655 stcb->sctp_ep, stcb, NULL, 656 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 657 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 658 SCTP_MOBILITY_FASTHANDOFF)) { 659 sctp_assoc_immediate_retrans(stcb, 660 stcb->asoc.primary_destination); 661 } 662 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 663 SCTP_MOBILITY_BASE)) { 664 sctp_move_chunks_from_net(stcb, 665 stcb->asoc.deleted_primary); 666 } 667 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 668 } 669 } 670 } 671 672 static int 673 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 674 { 675 /* 676 * Return 0 means we want you to proceed with the abort non-zero 677 * means no abort processing. 678 */ 679 uint32_t new_vtag; 680 struct sctpasochead *head; 681 682 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 683 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 684 atomic_add_int(&stcb->asoc.refcnt, 1); 685 SCTP_TCB_UNLOCK(stcb); 686 SCTP_INP_INFO_WLOCK(); 687 SCTP_TCB_LOCK(stcb); 688 atomic_subtract_int(&stcb->asoc.refcnt, 1); 689 } else { 690 return (0); 691 } 692 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 693 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 694 /* generate a new vtag and send init */ 695 LIST_REMOVE(stcb, sctp_asocs); 696 stcb->asoc.my_vtag = new_vtag; 697 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 698 /* 699 * put it in the bucket in the vtag hash of assoc's for the 700 * system 701 */ 702 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 703 SCTP_INP_INFO_WUNLOCK(); 704 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 705 return (1); 706 } else { 707 /* 708 * treat like a case where the cookie expired i.e.: - dump 709 * current cookie. - generate a new vtag. - resend init. 710 */ 711 /* generate a new vtag and send init */ 712 LIST_REMOVE(stcb, sctp_asocs); 713 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 714 sctp_stop_all_cookie_timers(stcb); 715 sctp_toss_old_cookies(stcb, &stcb->asoc); 716 stcb->asoc.my_vtag = new_vtag; 717 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 718 /* 719 * put it in the bucket in the vtag hash of assoc's for the 720 * system 721 */ 722 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 723 SCTP_INP_INFO_WUNLOCK(); 724 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 725 return (1); 726 } 727 return (0); 728 } 729 730 static int 731 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 732 struct sctp_nets *net) 733 { 734 /* 735 * return 0 means we want you to proceed with the abort non-zero 736 * means no abort processing 737 */ 738 if (stcb->asoc.auth_supported == 0) { 739 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 740 return (0); 741 } 742 sctp_asconf_send_nat_state_update(stcb, net); 743 return (1); 744 } 745 746 /* Returns 1 if the stcb was aborted, 0 otherwise */ 747 static int 748 sctp_handle_abort(struct sctp_abort_chunk *abort, 749 struct sctp_tcb *stcb, struct sctp_nets *net) 750 { 751 uint16_t len; 752 uint16_t error; 753 754 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 755 if (stcb == NULL) 756 return (0); 757 758 len = ntohs(abort->ch.chunk_length); 759 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 760 /* 761 * Need to check the cause codes for our two magic nat 762 * aborts which don't kill the assoc necessarily. 763 */ 764 struct sctp_error_cause *cause; 765 766 cause = (struct sctp_error_cause *)(abort + 1); 767 error = ntohs(cause->code); 768 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 769 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 770 abort->ch.chunk_flags); 771 if (sctp_handle_nat_colliding_state(stcb)) { 772 return (0); 773 } 774 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 775 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 776 abort->ch.chunk_flags); 777 if (sctp_handle_nat_missing_state(stcb, net)) { 778 return (0); 779 } 780 } 781 } else { 782 error = 0; 783 } 784 /* stop any receive timers */ 785 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 786 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 787 /* notify user of the abort and clean up... */ 788 sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED); 789 /* free the tcb */ 790 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 791 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 792 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 793 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 794 } 795 #ifdef SCTP_ASOCLOG_OF_TSNS 796 sctp_print_out_track_log(stcb); 797 #endif 798 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 799 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 800 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 801 return (1); 802 } 803 804 static void 805 sctp_start_net_timers(struct sctp_tcb *stcb) 806 { 807 uint32_t cnt_hb_sent; 808 struct sctp_nets *net; 809 810 cnt_hb_sent = 0; 811 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 812 /* 813 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 814 * If the dest in unconfirmed send a hb as well if under 815 * max_hb_burst have been sent. 816 */ 817 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 818 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 819 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 820 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 821 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 822 cnt_hb_sent++; 823 } 824 } 825 if (cnt_hb_sent) { 826 sctp_chunk_output(stcb->sctp_ep, stcb, 827 SCTP_OUTPUT_FROM_COOKIE_ACK, 828 SCTP_SO_NOT_LOCKED); 829 } 830 } 831 832 static void 833 sctp_check_data_from_peer(struct sctp_tcb *stcb, int *abort_flag) 834 { 835 char msg[SCTP_DIAG_INFO_LEN]; 836 struct sctp_association *asoc; 837 struct mbuf *op_err; 838 unsigned int i; 839 840 *abort_flag = 0; 841 asoc = &stcb->asoc; 842 if (SCTP_TSN_GT(asoc->highest_tsn_inside_map, asoc->cumulative_tsn) || 843 SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->cumulative_tsn)) { 844 SCTP_SNPRINTF(msg, sizeof(msg), "Missing TSN"); 845 *abort_flag = 1; 846 } 847 if (!*abort_flag) { 848 for (i = 0; i < asoc->streamincnt; i++) { 849 if (!TAILQ_EMPTY(&asoc->strmin[i].inqueue) || 850 !TAILQ_EMPTY(&asoc->strmin[i].uno_inqueue)) { 851 SCTP_SNPRINTF(msg, sizeof(msg), "Missing user data"); 852 *abort_flag = 1; 853 break; 854 } 855 } 856 } 857 if (*abort_flag) { 858 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 859 stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INPUT + SCTP_LOC_9; 860 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, false, SCTP_SO_NOT_LOCKED); 861 } 862 } 863 864 static void 865 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 866 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 867 { 868 int some_on_streamwheel; 869 int old_state; 870 871 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_shutdown: handling SHUTDOWN\n"); 872 if (stcb == NULL) 873 return; 874 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 875 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 876 return; 877 } 878 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 879 /* Shutdown NOT the expected size */ 880 return; 881 } 882 old_state = SCTP_GET_STATE(stcb); 883 sctp_update_acked(stcb, cp, abort_flag); 884 if (*abort_flag) { 885 return; 886 } 887 sctp_check_data_from_peer(stcb, abort_flag); 888 if (*abort_flag) { 889 return; 890 } 891 if (stcb->sctp_socket) { 892 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 893 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 894 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 895 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 896 /* 897 * notify upper layer that peer has initiated a 898 * shutdown 899 */ 900 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 901 902 /* reset time */ 903 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 904 } 905 } 906 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 907 /* 908 * stop the shutdown timer, since we WILL move to 909 * SHUTDOWN-ACK-SENT. 910 */ 911 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 912 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 913 } 914 /* Now is there unsent data on a stream somewhere? */ 915 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 916 917 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 918 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 919 some_on_streamwheel) { 920 /* By returning we will push more data out */ 921 return; 922 } else { 923 /* no outstanding data to send, so move on... */ 924 /* send SHUTDOWN-ACK */ 925 /* move to SHUTDOWN-ACK-SENT state */ 926 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 927 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 928 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 929 } 930 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 931 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 932 sctp_stop_timers_for_shutdown(stcb); 933 sctp_send_shutdown_ack(stcb, net); 934 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 935 stcb->sctp_ep, stcb, net); 936 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 937 sctp_send_shutdown_ack(stcb, net); 938 } 939 } 940 } 941 942 static void 943 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 944 struct sctp_tcb *stcb, 945 struct sctp_nets *net) 946 { 947 int abort_flag; 948 949 SCTPDBG(SCTP_DEBUG_INPUT2, 950 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 951 if (stcb == NULL) { 952 return; 953 } 954 955 /* process according to association state */ 956 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 957 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 958 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 959 sctp_send_shutdown_complete(stcb, net, 1); 960 SCTP_TCB_UNLOCK(stcb); 961 return; 962 } 963 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 964 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 965 /* unexpected SHUTDOWN-ACK... so ignore... */ 966 SCTP_TCB_UNLOCK(stcb); 967 return; 968 } 969 sctp_check_data_from_peer(stcb, &abort_flag); 970 if (abort_flag) { 971 return; 972 } 973 #ifdef INVARIANTS 974 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 975 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 976 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 977 panic("Queues are not empty when handling SHUTDOWN-ACK"); 978 } 979 #endif 980 /* stop the timer */ 981 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 982 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 983 /* send SHUTDOWN-COMPLETE */ 984 sctp_send_shutdown_complete(stcb, net, 0); 985 /* notify upper layer protocol */ 986 if (stcb->sctp_socket) { 987 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 988 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 989 SCTP_SB_CLEAR(stcb->sctp_socket->so_snd); 990 } 991 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 992 } 993 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 994 /* free the TCB but first save off the ep */ 995 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 996 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 997 } 998 999 static void 1000 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1001 { 1002 switch (chunk_type) { 1003 case SCTP_ASCONF_ACK: 1004 case SCTP_ASCONF: 1005 sctp_asconf_cleanup(stcb); 1006 break; 1007 case SCTP_IFORWARD_CUM_TSN: 1008 case SCTP_FORWARD_CUM_TSN: 1009 stcb->asoc.prsctp_supported = 0; 1010 break; 1011 default: 1012 SCTPDBG(SCTP_DEBUG_INPUT2, 1013 "Peer does not support chunk type %d (0x%x).\n", 1014 chunk_type, chunk_type); 1015 break; 1016 } 1017 } 1018 1019 /* 1020 * Skip past the param header and then we will find the param that caused the 1021 * problem. There are a number of param's in a ASCONF OR the prsctp param 1022 * these will turn of specific features. 1023 * XXX: Is this the right thing to do? 1024 */ 1025 static void 1026 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1027 { 1028 switch (parameter_type) { 1029 /* pr-sctp draft */ 1030 case SCTP_PRSCTP_SUPPORTED: 1031 stcb->asoc.prsctp_supported = 0; 1032 break; 1033 case SCTP_SUPPORTED_CHUNK_EXT: 1034 break; 1035 /* draft-ietf-tsvwg-addip-sctp */ 1036 case SCTP_HAS_NAT_SUPPORT: 1037 stcb->asoc.peer_supports_nat = 0; 1038 break; 1039 case SCTP_ADD_IP_ADDRESS: 1040 case SCTP_DEL_IP_ADDRESS: 1041 case SCTP_SET_PRIM_ADDR: 1042 stcb->asoc.asconf_supported = 0; 1043 break; 1044 case SCTP_SUCCESS_REPORT: 1045 case SCTP_ERROR_CAUSE_IND: 1046 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1047 SCTPDBG(SCTP_DEBUG_INPUT2, 1048 "Turning off ASCONF to this strange peer\n"); 1049 stcb->asoc.asconf_supported = 0; 1050 break; 1051 default: 1052 SCTPDBG(SCTP_DEBUG_INPUT2, 1053 "Peer does not support param type %d (0x%x)??\n", 1054 parameter_type, parameter_type); 1055 break; 1056 } 1057 } 1058 1059 static int 1060 sctp_handle_error(struct sctp_chunkhdr *ch, 1061 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1062 { 1063 struct sctp_error_cause *cause; 1064 struct sctp_association *asoc; 1065 uint32_t remaining_length, adjust; 1066 uint16_t code, cause_code, cause_length; 1067 1068 /* parse through all of the errors and process */ 1069 asoc = &stcb->asoc; 1070 cause = (struct sctp_error_cause *)((caddr_t)ch + 1071 sizeof(struct sctp_chunkhdr)); 1072 remaining_length = ntohs(ch->chunk_length); 1073 if (remaining_length > limit) { 1074 remaining_length = limit; 1075 } 1076 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1077 remaining_length -= sizeof(struct sctp_chunkhdr); 1078 } else { 1079 remaining_length = 0; 1080 } 1081 code = 0; 1082 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1083 /* Process an Error Cause */ 1084 cause_code = ntohs(cause->code); 1085 cause_length = ntohs(cause->length); 1086 if ((cause_length > remaining_length) || (cause_length == 0)) { 1087 /* Invalid cause length, possibly due to truncation. */ 1088 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1089 remaining_length, cause_length); 1090 return (0); 1091 } 1092 if (code == 0) { 1093 /* report the first error cause */ 1094 code = cause_code; 1095 } 1096 switch (cause_code) { 1097 case SCTP_CAUSE_INVALID_STREAM: 1098 case SCTP_CAUSE_MISSING_PARAM: 1099 case SCTP_CAUSE_INVALID_PARAM: 1100 case SCTP_CAUSE_NO_USER_DATA: 1101 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1102 cause_code); 1103 break; 1104 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1105 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1106 ch->chunk_flags); 1107 if (sctp_handle_nat_colliding_state(stcb)) { 1108 return (0); 1109 } 1110 break; 1111 case SCTP_CAUSE_NAT_MISSING_STATE: 1112 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1113 ch->chunk_flags); 1114 if (sctp_handle_nat_missing_state(stcb, net)) { 1115 return (0); 1116 } 1117 break; 1118 case SCTP_CAUSE_STALE_COOKIE: 1119 /* 1120 * We only act if we have echoed a cookie and are 1121 * waiting. 1122 */ 1123 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1124 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1125 struct timeval now; 1126 struct sctp_error_stale_cookie *stale_cookie; 1127 uint64_t stale_time; 1128 1129 asoc->stale_cookie_count++; 1130 if (asoc->stale_cookie_count > asoc->max_init_times) { 1131 sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED); 1132 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1133 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1134 return (-1); 1135 } 1136 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1137 stale_time = ntohl(stale_cookie->stale_time); 1138 if (stale_time == 0) { 1139 /* Use an RTT as an approximation. */ 1140 (void)SCTP_GETTIME_TIMEVAL(&now); 1141 timevalsub(&now, &asoc->time_entered); 1142 stale_time = (uint64_t)1000000 * (uint64_t)now.tv_sec + (uint64_t)now.tv_usec; 1143 if (stale_time == 0) { 1144 stale_time = 1; 1145 } 1146 } 1147 /* 1148 * stale_time is in usec, convert it to 1149 * msec. Round upwards, to ensure that it is 1150 * non-zero. 1151 */ 1152 stale_time = (stale_time + 999) / 1000; 1153 /* Double it, to be more robust on RTX. */ 1154 stale_time = 2 * stale_time; 1155 asoc->cookie_preserve_req = (uint32_t)stale_time; 1156 if (asoc->overall_error_count == 0) { 1157 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 1158 SCTP_RTT_FROM_NON_DATA); 1159 } 1160 asoc->overall_error_count = 0; 1161 /* Blast back to INIT state */ 1162 sctp_toss_old_cookies(stcb, &stcb->asoc); 1163 sctp_stop_all_cookie_timers(stcb); 1164 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1165 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 1166 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1167 } 1168 break; 1169 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1170 /* 1171 * Nothing we can do here, we don't do hostname 1172 * addresses so if the peer does not like my IPv6 1173 * (or IPv4 for that matter) it does not matter. If 1174 * they don't support that type of address, they can 1175 * NOT possibly get that packet type... i.e. with no 1176 * IPv6 you can't receive a IPv6 packet. so we can 1177 * safely ignore this one. If we ever added support 1178 * for HOSTNAME Addresses, then we would need to do 1179 * something here. 1180 */ 1181 break; 1182 case SCTP_CAUSE_UNRECOG_CHUNK: 1183 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1184 struct sctp_error_unrecognized_chunk *unrec_chunk; 1185 1186 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1187 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1188 } 1189 break; 1190 case SCTP_CAUSE_UNRECOG_PARAM: 1191 /* XXX: We only consider the first parameter */ 1192 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1193 struct sctp_paramhdr *unrec_parameter; 1194 1195 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1196 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1197 } 1198 break; 1199 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1200 /* 1201 * We ignore this since the timer will drive out a 1202 * new cookie anyway and there timer will drive us 1203 * to send a SHUTDOWN_COMPLETE. We can't send one 1204 * here since we don't have their tag. 1205 */ 1206 break; 1207 case SCTP_CAUSE_DELETING_LAST_ADDR: 1208 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1209 case SCTP_CAUSE_DELETING_SRC_ADDR: 1210 /* 1211 * We should NOT get these here, but in a 1212 * ASCONF-ACK. 1213 */ 1214 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1215 cause_code); 1216 break; 1217 case SCTP_CAUSE_OUT_OF_RESC: 1218 /* 1219 * And what, pray tell do we do with the fact that 1220 * the peer is out of resources? Not really sure we 1221 * could do anything but abort. I suspect this 1222 * should have came WITH an abort instead of in a 1223 * OP-ERROR. 1224 */ 1225 break; 1226 default: 1227 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1228 cause_code); 1229 break; 1230 } 1231 adjust = SCTP_SIZE32(cause_length); 1232 if (remaining_length >= adjust) { 1233 remaining_length -= adjust; 1234 } else { 1235 remaining_length = 0; 1236 } 1237 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1238 } 1239 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1240 return (0); 1241 } 1242 1243 static int 1244 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1245 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1246 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1247 struct sctp_nets *net, int *abort_no_unlock, 1248 uint8_t mflowtype, uint32_t mflowid, 1249 uint32_t vrf_id) 1250 { 1251 struct sctp_init_ack *init_ack; 1252 struct mbuf *op_err; 1253 1254 SCTPDBG(SCTP_DEBUG_INPUT2, 1255 "sctp_handle_init_ack: handling INIT-ACK\n"); 1256 1257 if (stcb == NULL) { 1258 SCTPDBG(SCTP_DEBUG_INPUT2, 1259 "sctp_handle_init_ack: TCB is null\n"); 1260 return (-1); 1261 } 1262 /* Only process the INIT-ACK chunk in COOKIE WAIT state. */ 1263 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 1264 init_ack = &cp->init; 1265 /* Validate parameters. */ 1266 if ((ntohl(init_ack->initiate_tag) == 0) || 1267 (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) || 1268 (ntohs(init_ack->num_inbound_streams) == 0) || 1269 (ntohs(init_ack->num_outbound_streams) == 0)) { 1270 /* One of the mandatory parameters is illegal. */ 1271 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1272 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1273 src, dst, sh, op_err, 1274 mflowtype, mflowid, 1275 vrf_id, net->port); 1276 *abort_no_unlock = 1; 1277 return (-1); 1278 } 1279 if (stcb->asoc.primary_destination->dest_state & 1280 SCTP_ADDR_UNCONFIRMED) { 1281 /* 1282 * The primary is where we sent the INIT, we can 1283 * always consider it confirmed when the INIT-ACK is 1284 * returned. Do this before we load addresses 1285 * though. 1286 */ 1287 stcb->asoc.primary_destination->dest_state &= 1288 ~SCTP_ADDR_UNCONFIRMED; 1289 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1290 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1291 } 1292 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1293 net, abort_no_unlock, 1294 mflowtype, mflowid, 1295 vrf_id) < 0) { 1296 /* error in parsing parameters */ 1297 return (-1); 1298 } 1299 /* Update our state. */ 1300 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1301 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1302 1303 /* Reset the RTO calculation. */ 1304 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1305 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1306 stcb->asoc.overall_error_count, 1307 0, 1308 SCTP_FROM_SCTP_INPUT, 1309 __LINE__); 1310 } 1311 stcb->asoc.overall_error_count = 0; 1312 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1313 /* 1314 * Collapse the init timer back in case of a exponential 1315 * backoff. 1316 */ 1317 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1318 stcb, net); 1319 /* 1320 * The output routine at the end of the inbound data 1321 * processing will cause the cookie to be sent. 1322 */ 1323 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1324 return (0); 1325 } else { 1326 return (-1); 1327 } 1328 } 1329 1330 static struct sctp_tcb * 1331 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1332 struct sockaddr *src, struct sockaddr *dst, 1333 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1334 struct sctp_inpcb *inp, struct sctp_nets **netp, 1335 struct sockaddr *init_src, int *notification, 1336 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1337 uint8_t mflowtype, uint32_t mflowid, 1338 uint32_t vrf_id, uint16_t port); 1339 1340 /* 1341 * handle a state cookie for an existing association m: input packet mbuf 1342 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1343 * "split" mbuf and the cookie signature does not exist offset: offset into 1344 * mbuf to the cookie-echo chunk 1345 */ 1346 static struct sctp_tcb * 1347 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1348 struct sockaddr *src, struct sockaddr *dst, 1349 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1350 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1351 struct sockaddr *init_src, int *notification, 1352 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1353 uint8_t mflowtype, uint32_t mflowid, 1354 uint32_t vrf_id, uint16_t port) 1355 { 1356 struct sctp_association *asoc; 1357 struct sctp_init_chunk *init_cp, init_buf; 1358 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1359 struct sctp_asconf_addr *aparam, *naparam; 1360 struct sctp_asconf_ack *aack, *naack; 1361 struct sctp_tmit_chunk *chk, *nchk; 1362 struct sctp_stream_reset_list *strrst, *nstrrst; 1363 struct sctp_queued_to_read *sq, *nsq; 1364 struct sctp_nets *net; 1365 struct mbuf *op_err; 1366 int init_offset, initack_offset, i; 1367 int retval; 1368 int spec_flag = 0; 1369 uint32_t how_indx; 1370 #if defined(SCTP_DETAILED_STR_STATS) 1371 int j; 1372 #endif 1373 1374 net = *netp; 1375 /* I know that the TCB is non-NULL from the caller */ 1376 asoc = &stcb->asoc; 1377 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1378 if (asoc->cookie_how[how_indx] == 0) 1379 break; 1380 } 1381 if (how_indx < sizeof(asoc->cookie_how)) { 1382 asoc->cookie_how[how_indx] = 1; 1383 } 1384 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1385 /* SHUTDOWN came in after sending INIT-ACK */ 1386 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1387 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1388 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1389 mflowtype, mflowid, inp->fibnum, 1390 vrf_id, net->port); 1391 if (how_indx < sizeof(asoc->cookie_how)) 1392 asoc->cookie_how[how_indx] = 2; 1393 SCTP_TCB_UNLOCK(stcb); 1394 return (NULL); 1395 } 1396 /* 1397 * find and validate the INIT chunk in the cookie (peer's info) the 1398 * INIT should start after the cookie-echo header struct (chunk 1399 * header, state cookie header struct) 1400 */ 1401 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1402 1403 init_cp = (struct sctp_init_chunk *) 1404 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1405 (uint8_t *)&init_buf); 1406 if (init_cp == NULL) { 1407 /* could not pull a INIT chunk in cookie */ 1408 SCTP_TCB_UNLOCK(stcb); 1409 return (NULL); 1410 } 1411 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1412 SCTP_TCB_UNLOCK(stcb); 1413 return (NULL); 1414 } 1415 /* 1416 * find and validate the INIT-ACK chunk in the cookie (my info) the 1417 * INIT-ACK follows the INIT chunk 1418 */ 1419 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1420 initack_cp = (struct sctp_init_ack_chunk *) 1421 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1422 (uint8_t *)&initack_buf); 1423 if (initack_cp == NULL) { 1424 /* could not pull INIT-ACK chunk in cookie */ 1425 SCTP_TCB_UNLOCK(stcb); 1426 return (NULL); 1427 } 1428 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1429 SCTP_TCB_UNLOCK(stcb); 1430 return (NULL); 1431 } 1432 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1433 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1434 /* 1435 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1436 * to get into the OPEN state 1437 */ 1438 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1439 /*- 1440 * Opps, this means that we somehow generated two vtag's 1441 * the same. I.e. we did: 1442 * Us Peer 1443 * <---INIT(tag=a)------ 1444 * ----INIT-ACK(tag=t)--> 1445 * ----INIT(tag=t)------> *1 1446 * <---INIT-ACK(tag=a)--- 1447 * <----CE(tag=t)------------- *2 1448 * 1449 * At point *1 we should be generating a different 1450 * tag t'. Which means we would throw away the CE and send 1451 * ours instead. Basically this is case C (throw away side). 1452 */ 1453 if (how_indx < sizeof(asoc->cookie_how)) 1454 asoc->cookie_how[how_indx] = 17; 1455 SCTP_TCB_UNLOCK(stcb); 1456 return (NULL); 1457 } 1458 switch (SCTP_GET_STATE(stcb)) { 1459 case SCTP_STATE_COOKIE_WAIT: 1460 case SCTP_STATE_COOKIE_ECHOED: 1461 /* 1462 * INIT was sent but got a COOKIE_ECHO with the 1463 * correct tags... just accept it...but we must 1464 * process the init so that we can make sure we have 1465 * the right seq no's. 1466 */ 1467 /* First we must process the INIT !! */ 1468 if (sctp_process_init(init_cp, stcb) < 0) { 1469 if (how_indx < sizeof(asoc->cookie_how)) 1470 asoc->cookie_how[how_indx] = 3; 1471 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1472 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1473 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1474 src, dst, sh, op_err, 1475 mflowtype, mflowid, 1476 vrf_id, net->port); 1477 return (NULL); 1478 } 1479 /* we have already processed the INIT so no problem */ 1480 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1481 stcb, net, 1482 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1483 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1484 stcb, net, 1485 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1486 /* update current state */ 1487 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1488 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1489 else 1490 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1491 1492 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1493 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1494 sctp_stop_all_cookie_timers(stcb); 1495 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1496 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1497 (!SCTP_IS_LISTENING(inp))) { 1498 /* 1499 * Here is where collision would go if we 1500 * did a connect() and instead got a 1501 * init/init-ack/cookie done before the 1502 * init-ack came back.. 1503 */ 1504 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1505 soisconnected(stcb->sctp_socket); 1506 } 1507 /* notify upper layer */ 1508 *notification = SCTP_NOTIFY_ASSOC_UP; 1509 net->hb_responded = 1; 1510 if (stcb->asoc.sctp_autoclose_ticks && 1511 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1512 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1513 inp, stcb, NULL); 1514 } 1515 break; 1516 default: 1517 /* 1518 * we're in the OPEN state (or beyond), so peer must 1519 * have simply lost the COOKIE-ACK 1520 */ 1521 break; 1522 } /* end switch */ 1523 sctp_stop_all_cookie_timers(stcb); 1524 if ((retval = sctp_load_addresses_from_init(stcb, m, 1525 init_offset + sizeof(struct sctp_init_chunk), 1526 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1527 if (how_indx < sizeof(asoc->cookie_how)) 1528 asoc->cookie_how[how_indx] = 4; 1529 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1530 "Problem with address parameters"); 1531 SCTPDBG(SCTP_DEBUG_INPUT1, 1532 "Load addresses from INIT causes an abort %d\n", 1533 retval); 1534 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1535 src, dst, sh, op_err, 1536 mflowtype, mflowid, 1537 vrf_id, net->port); 1538 return (NULL); 1539 } 1540 /* respond with a COOKIE-ACK */ 1541 sctp_toss_old_cookies(stcb, asoc); 1542 sctp_send_cookie_ack(stcb); 1543 if (how_indx < sizeof(asoc->cookie_how)) 1544 asoc->cookie_how[how_indx] = 5; 1545 return (stcb); 1546 } 1547 1548 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1549 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1550 cookie->tie_tag_my_vtag == 0 && 1551 cookie->tie_tag_peer_vtag == 0) { 1552 /* 1553 * case C in Section 5.2.4 Table 2: XMOO silently discard 1554 */ 1555 if (how_indx < sizeof(asoc->cookie_how)) 1556 asoc->cookie_how[how_indx] = 6; 1557 SCTP_TCB_UNLOCK(stcb); 1558 return (NULL); 1559 } 1560 /* 1561 * If nat support, and the below and stcb is established, send back 1562 * a ABORT(colliding state) if we are established. 1563 */ 1564 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1565 (asoc->peer_supports_nat) && 1566 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1567 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1568 (asoc->peer_vtag == 0)))) { 1569 /* 1570 * Special case - Peer's support nat. We may have two init's 1571 * that we gave out the same tag on since one was not 1572 * established.. i.e. we get INIT from host-1 behind the nat 1573 * and we respond tag-a, we get a INIT from host-2 behind 1574 * the nat and we get tag-a again. Then we bring up host-1 1575 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1576 * Now we have colliding state. We must send an abort here 1577 * with colliding state indication. 1578 */ 1579 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1580 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1581 mflowtype, mflowid, inp->fibnum, 1582 vrf_id, port); 1583 SCTP_TCB_UNLOCK(stcb); 1584 return (NULL); 1585 } 1586 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1587 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1588 (asoc->peer_vtag == 0))) { 1589 /* 1590 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1591 * should be ok, re-accept peer info 1592 */ 1593 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1594 /* 1595 * Extension of case C. If we hit this, then the 1596 * random number generator returned the same vtag 1597 * when we first sent our INIT-ACK and when we later 1598 * sent our INIT. The side with the seq numbers that 1599 * are different will be the one that normally would 1600 * have hit case C. This in effect "extends" our 1601 * vtags in this collision case to be 64 bits. The 1602 * same collision could occur aka you get both vtag 1603 * and seq number the same twice in a row.. but is 1604 * much less likely. If it did happen then we would 1605 * proceed through and bring up the assoc.. we may 1606 * end up with the wrong stream setup however.. 1607 * which would be bad.. but there is no way to 1608 * tell.. until we send on a stream that does not 1609 * exist :-) 1610 */ 1611 if (how_indx < sizeof(asoc->cookie_how)) 1612 asoc->cookie_how[how_indx] = 7; 1613 1614 SCTP_TCB_UNLOCK(stcb); 1615 return (NULL); 1616 } 1617 if (how_indx < sizeof(asoc->cookie_how)) 1618 asoc->cookie_how[how_indx] = 8; 1619 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1620 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1621 sctp_stop_all_cookie_timers(stcb); 1622 /* 1623 * since we did not send a HB make sure we don't double 1624 * things 1625 */ 1626 net->hb_responded = 1; 1627 if (stcb->asoc.sctp_autoclose_ticks && 1628 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1629 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1630 NULL); 1631 } 1632 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1633 if (asoc->pre_open_streams < asoc->streamoutcnt) { 1634 asoc->pre_open_streams = asoc->streamoutcnt; 1635 } 1636 1637 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1638 /* 1639 * Ok the peer probably discarded our data (if we 1640 * echoed a cookie+data). So anything on the 1641 * sent_queue should be marked for retransmit, we 1642 * may not get something to kick us so it COULD 1643 * still take a timeout to move these.. but it can't 1644 * hurt to mark them. 1645 */ 1646 1647 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1648 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1649 chk->sent = SCTP_DATAGRAM_RESEND; 1650 sctp_flight_size_decrease(chk); 1651 sctp_total_flight_decrease(stcb, chk); 1652 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1653 spec_flag++; 1654 } 1655 } 1656 } 1657 /* process the INIT info (peer's info) */ 1658 if (sctp_process_init(init_cp, stcb) < 0) { 1659 if (how_indx < sizeof(asoc->cookie_how)) 1660 asoc->cookie_how[how_indx] = 9; 1661 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 1662 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n"); 1663 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1664 src, dst, sh, op_err, 1665 mflowtype, mflowid, 1666 vrf_id, net->port); 1667 return (NULL); 1668 } 1669 if ((retval = sctp_load_addresses_from_init(stcb, m, 1670 init_offset + sizeof(struct sctp_init_chunk), 1671 initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) { 1672 if (how_indx < sizeof(asoc->cookie_how)) 1673 asoc->cookie_how[how_indx] = 10; 1674 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 1675 "Problem with address parameters"); 1676 SCTPDBG(SCTP_DEBUG_INPUT1, 1677 "Load addresses from INIT causes an abort %d\n", 1678 retval); 1679 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1680 src, dst, sh, op_err, 1681 mflowtype, mflowid, 1682 vrf_id, net->port); 1683 return (NULL); 1684 } 1685 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1686 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1687 *notification = SCTP_NOTIFY_ASSOC_UP; 1688 1689 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1690 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1691 (!SCTP_IS_LISTENING(inp))) { 1692 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 1693 soisconnected(stcb->sctp_socket); 1694 } 1695 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1696 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1697 else 1698 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1699 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1700 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1701 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1702 } else { 1703 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1704 } 1705 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1706 sctp_stop_all_cookie_timers(stcb); 1707 sctp_toss_old_cookies(stcb, asoc); 1708 sctp_send_cookie_ack(stcb); 1709 if (spec_flag) { 1710 /* 1711 * only if we have retrans set do we do this. What 1712 * this call does is get only the COOKIE-ACK out and 1713 * then when we return the normal call to 1714 * sctp_chunk_output will get the retrans out behind 1715 * this. 1716 */ 1717 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1718 } 1719 if (how_indx < sizeof(asoc->cookie_how)) 1720 asoc->cookie_how[how_indx] = 11; 1721 1722 return (stcb); 1723 } 1724 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1725 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1726 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1727 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1728 cookie->tie_tag_peer_vtag != 0) { 1729 struct sctpasochead *head; 1730 1731 if (asoc->peer_supports_nat) { 1732 struct sctp_tcb *local_stcb; 1733 1734 /* 1735 * This is a gross gross hack. Just call the 1736 * cookie_new code since we are allowing a duplicate 1737 * association. I hope this works... 1738 */ 1739 local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, 1740 sh, cookie, cookie_len, 1741 inp, netp, init_src, notification, 1742 auth_skipped, auth_offset, auth_len, 1743 mflowtype, mflowid, 1744 vrf_id, port); 1745 if (local_stcb == NULL) { 1746 SCTP_TCB_UNLOCK(stcb); 1747 } 1748 return (local_stcb); 1749 } 1750 /* 1751 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1752 */ 1753 /* temp code */ 1754 if (how_indx < sizeof(asoc->cookie_how)) 1755 asoc->cookie_how[how_indx] = 12; 1756 sctp_stop_association_timers(stcb, false); 1757 /* notify upper layer */ 1758 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1759 atomic_add_int(&stcb->asoc.refcnt, 1); 1760 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1761 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1762 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1763 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1764 } 1765 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1766 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1767 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1768 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1769 } 1770 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1771 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 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->rcv_edmid = cookie->rcv_edmid; 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->rcv_edmid = cookie->rcv_edmid; 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 sctp_stop_all_cookie_timers(stcb); 2159 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2160 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2161 2162 /* set up to notify upper layer */ 2163 *notification = SCTP_NOTIFY_ASSOC_UP; 2164 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2165 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2166 (!SCTP_IS_LISTENING(inp))) { 2167 /* 2168 * This is an endpoint that called connect() how it got a 2169 * cookie that is NEW is a bit of a mystery. It must be that 2170 * the INIT was sent, but before it got there.. a complete 2171 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2172 * should have went to the other code.. not here.. oh well.. 2173 * a bit of protection is worth having.. 2174 * 2175 * XXXMJ unlocked 2176 */ 2177 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2178 soisconnected(stcb->sctp_socket); 2179 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2180 (SCTP_IS_LISTENING(inp))) { 2181 /* 2182 * We don't want to do anything with this one. Since it is 2183 * the listening guy. The timer will get started for 2184 * accepted connections in the caller. 2185 */ 2186 ; 2187 } 2188 if (stcb->asoc.sctp_autoclose_ticks && 2189 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2190 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2191 } 2192 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2193 *netp = sctp_findnet(stcb, init_src); 2194 if (*netp != NULL) { 2195 /* 2196 * Since we did not send a HB, make sure we don't double 2197 * things. 2198 */ 2199 (*netp)->hb_responded = 1; 2200 } 2201 /* respond with a COOKIE-ACK */ 2202 sctp_send_cookie_ack(stcb); 2203 2204 /* 2205 * check the address lists for any ASCONFs that need to be sent 2206 * AFTER the cookie-ack is sent 2207 */ 2208 sctp_check_address_list(stcb, m, 2209 initack_offset + sizeof(struct sctp_init_ack_chunk), 2210 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2211 &store.sa, cookie->local_scope, cookie->site_scope, 2212 cookie->ipv4_scope, cookie->loopback_scope); 2213 2214 return (stcb); 2215 } 2216 2217 /* 2218 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2219 * we NEED to make sure we are not already using the vtag. If so we 2220 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2221 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2222 SCTP_BASE_INFO(hashasocmark))]; 2223 LIST_FOREACH(stcb, head, sctp_asocs) { 2224 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2225 -- SEND ABORT - TRY AGAIN -- 2226 } 2227 } 2228 */ 2229 2230 /* 2231 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2232 * existing (non-NULL) TCB 2233 */ 2234 static struct mbuf * 2235 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2236 struct sockaddr *src, struct sockaddr *dst, 2237 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2238 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2239 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2240 struct sctp_tcb **locked_tcb, 2241 uint8_t mflowtype, uint32_t mflowid, 2242 uint32_t vrf_id, uint16_t port) 2243 { 2244 struct sctp_state_cookie *cookie; 2245 struct sctp_tcb *l_stcb = *stcb; 2246 struct sctp_inpcb *l_inp; 2247 struct sockaddr *to; 2248 struct sctp_pcb *ep; 2249 struct mbuf *m_sig; 2250 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2251 uint8_t *sig; 2252 uint8_t cookie_ok = 0; 2253 unsigned int sig_offset, cookie_offset; 2254 unsigned int cookie_len; 2255 struct timeval now; 2256 struct timeval time_entered, time_expires; 2257 int notification = 0; 2258 struct sctp_nets *netl; 2259 int had_a_existing_tcb = 0; 2260 int send_int_conf = 0; 2261 #ifdef INET 2262 struct sockaddr_in sin; 2263 #endif 2264 #ifdef INET6 2265 struct sockaddr_in6 sin6; 2266 #endif 2267 2268 SCTPDBG(SCTP_DEBUG_INPUT2, 2269 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2270 2271 if (inp_p == NULL) { 2272 return (NULL); 2273 } 2274 cookie = &cp->cookie; 2275 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2276 cookie_len = ntohs(cp->ch.chunk_length); 2277 2278 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2279 sizeof(struct sctp_init_chunk) + 2280 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2281 /* cookie too small */ 2282 return (NULL); 2283 } 2284 if ((cookie->peerport != sh->src_port) || 2285 (cookie->myport != sh->dest_port) || 2286 (cookie->my_vtag != sh->v_tag)) { 2287 /* 2288 * invalid ports or bad tag. Note that we always leave the 2289 * v_tag in the header in network order and when we stored 2290 * it in the my_vtag slot we also left it in network order. 2291 * This maintains the match even though it may be in the 2292 * opposite byte order of the machine :-> 2293 */ 2294 return (NULL); 2295 } 2296 /* 2297 * split off the signature into its own mbuf (since it should not be 2298 * calculated in the sctp_hmac_m() call). 2299 */ 2300 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2301 m_sig = m_split(m, sig_offset, M_NOWAIT); 2302 if (m_sig == NULL) { 2303 /* out of memory or ?? */ 2304 return (NULL); 2305 } 2306 #ifdef SCTP_MBUF_LOGGING 2307 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2308 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2309 } 2310 #endif 2311 2312 /* 2313 * compute the signature/digest for the cookie 2314 */ 2315 if (l_stcb != NULL) { 2316 atomic_add_int(&l_stcb->asoc.refcnt, 1); 2317 SCTP_TCB_UNLOCK(l_stcb); 2318 } 2319 l_inp = *inp_p; 2320 SCTP_INP_RLOCK(l_inp); 2321 if (l_stcb != NULL) { 2322 SCTP_TCB_LOCK(l_stcb); 2323 atomic_subtract_int(&l_stcb->asoc.refcnt, 1); 2324 } 2325 if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 2326 SCTP_INP_RUNLOCK(l_inp); 2327 sctp_m_freem(m_sig); 2328 return (NULL); 2329 } 2330 ep = &(*inp_p)->sctp_ep; 2331 /* which cookie is it? */ 2332 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2333 (ep->current_secret_number != ep->last_secret_number)) { 2334 /* it's the old cookie */ 2335 (void)sctp_hmac_m(SCTP_HMAC, 2336 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2337 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2338 } else { 2339 /* it's the current cookie */ 2340 (void)sctp_hmac_m(SCTP_HMAC, 2341 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2342 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2343 } 2344 /* get the signature */ 2345 SCTP_INP_RUNLOCK(l_inp); 2346 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2347 if (sig == NULL) { 2348 /* couldn't find signature */ 2349 sctp_m_freem(m_sig); 2350 return (NULL); 2351 } 2352 /* compare the received digest with the computed digest */ 2353 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2354 /* try the old cookie? */ 2355 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2356 (ep->current_secret_number != ep->last_secret_number)) { 2357 /* compute digest with old */ 2358 (void)sctp_hmac_m(SCTP_HMAC, 2359 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2360 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2361 /* compare */ 2362 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2363 cookie_ok = 1; 2364 } 2365 } else { 2366 cookie_ok = 1; 2367 } 2368 2369 /* 2370 * Now before we continue we must reconstruct our mbuf so that 2371 * normal processing of any other chunks will work. 2372 */ 2373 { 2374 struct mbuf *m_at; 2375 2376 m_at = m; 2377 while (SCTP_BUF_NEXT(m_at) != NULL) { 2378 m_at = SCTP_BUF_NEXT(m_at); 2379 } 2380 SCTP_BUF_NEXT(m_at) = m_sig; 2381 } 2382 2383 if (cookie_ok == 0) { 2384 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2385 SCTPDBG(SCTP_DEBUG_INPUT2, 2386 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2387 (uint32_t)offset, cookie_offset, sig_offset); 2388 return (NULL); 2389 } 2390 2391 if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) { 2392 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n"); 2393 return (NULL); 2394 } 2395 time_entered.tv_sec = cookie->time_entered.tv_sec; 2396 time_entered.tv_usec = cookie->time_entered.tv_usec; 2397 if ((time_entered.tv_sec < 0) || 2398 (time_entered.tv_usec < 0) || 2399 (time_entered.tv_usec >= 1000000)) { 2400 /* Invalid time stamp. Cookie must have been modified. */ 2401 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n"); 2402 return (NULL); 2403 } 2404 (void)SCTP_GETTIME_TIMEVAL(&now); 2405 if (timevalcmp(&now, &time_entered, <)) { 2406 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n"); 2407 return (NULL); 2408 } 2409 /* 2410 * Check the cookie timestamps to be sure it's not stale. 2411 * cookie_life is in ticks, so we convert to seconds. 2412 */ 2413 time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2414 time_expires.tv_usec = time_entered.tv_usec; 2415 if (timevalcmp(&now, &time_expires, >)) { 2416 /* cookie is stale! */ 2417 struct mbuf *op_err; 2418 struct sctp_error_stale_cookie *cause; 2419 struct timeval diff; 2420 uint32_t staleness; 2421 2422 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2423 0, M_NOWAIT, 1, MT_DATA); 2424 if (op_err == NULL) { 2425 /* FOOBAR */ 2426 return (NULL); 2427 } 2428 /* Set the len */ 2429 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2430 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2431 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2432 cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie)); 2433 diff = now; 2434 timevalsub(&diff, &time_expires); 2435 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2436 staleness = UINT32_MAX; 2437 } else { 2438 staleness = (uint32_t)diff.tv_sec * 1000000; 2439 } 2440 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2441 staleness += (uint32_t)diff.tv_usec; 2442 } else { 2443 staleness = UINT32_MAX; 2444 } 2445 cause->stale_time = htonl(staleness); 2446 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2447 mflowtype, mflowid, l_inp->fibnum, 2448 vrf_id, port); 2449 return (NULL); 2450 } 2451 /* 2452 * Now we must see with the lookup address if we have an existing 2453 * asoc. This will only happen if we were in the COOKIE-WAIT state 2454 * and a INIT collided with us and somewhere the peer sent the 2455 * cookie on another address besides the single address our assoc 2456 * had for him. In this case we will have one of the tie-tags set at 2457 * least AND the address field in the cookie can be used to look it 2458 * up. 2459 */ 2460 to = NULL; 2461 switch (cookie->addr_type) { 2462 #ifdef INET6 2463 case SCTP_IPV6_ADDRESS: 2464 memset(&sin6, 0, sizeof(sin6)); 2465 sin6.sin6_family = AF_INET6; 2466 sin6.sin6_len = sizeof(sin6); 2467 sin6.sin6_port = sh->src_port; 2468 sin6.sin6_scope_id = cookie->scope_id; 2469 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2470 sizeof(sin6.sin6_addr.s6_addr)); 2471 to = (struct sockaddr *)&sin6; 2472 break; 2473 #endif 2474 #ifdef INET 2475 case SCTP_IPV4_ADDRESS: 2476 memset(&sin, 0, sizeof(sin)); 2477 sin.sin_family = AF_INET; 2478 sin.sin_len = sizeof(sin); 2479 sin.sin_port = sh->src_port; 2480 sin.sin_addr.s_addr = cookie->address[0]; 2481 to = (struct sockaddr *)&sin; 2482 break; 2483 #endif 2484 default: 2485 /* This should not happen */ 2486 return (NULL); 2487 } 2488 if (*stcb == NULL) { 2489 /* Yep, lets check */ 2490 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2491 if (*stcb == NULL) { 2492 /* 2493 * We should have only got back the same inp. If we 2494 * got back a different ep we have a problem. The 2495 * original findep got back l_inp and now 2496 */ 2497 if (l_inp != *inp_p) { 2498 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2499 } 2500 } else { 2501 if (*locked_tcb == NULL) { 2502 /* 2503 * In this case we found the assoc only 2504 * after we locked the create lock. This 2505 * means we are in a colliding case and we 2506 * must make sure that we unlock the tcb if 2507 * its one of the cases where we throw away 2508 * the incoming packets. 2509 */ 2510 *locked_tcb = *stcb; 2511 2512 /* 2513 * We must also increment the inp ref count 2514 * since the ref_count flags was set when we 2515 * did not find the TCB, now we found it 2516 * which reduces the refcount.. we must 2517 * raise it back out to balance it all :-) 2518 */ 2519 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2520 if ((*stcb)->sctp_ep != l_inp) { 2521 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2522 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2523 } 2524 } 2525 } 2526 } 2527 2528 cookie_len -= SCTP_SIGNATURE_SIZE; 2529 if (*stcb == NULL) { 2530 /* this is the "normal" case... get a new TCB */ 2531 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2532 cookie, cookie_len, *inp_p, 2533 netp, to, ¬ification, 2534 auth_skipped, auth_offset, auth_len, 2535 mflowtype, mflowid, 2536 vrf_id, port); 2537 } else { 2538 /* this is abnormal... cookie-echo on existing TCB */ 2539 had_a_existing_tcb = 1; 2540 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2541 src, dst, sh, 2542 cookie, cookie_len, *inp_p, *stcb, netp, to, 2543 ¬ification, auth_skipped, auth_offset, auth_len, 2544 mflowtype, mflowid, 2545 vrf_id, port); 2546 if (*stcb == NULL) { 2547 *locked_tcb = NULL; 2548 } 2549 } 2550 2551 if (*stcb == NULL) { 2552 /* still no TCB... must be bad cookie-echo */ 2553 return (NULL); 2554 } 2555 if (*netp != NULL) { 2556 (*netp)->flowtype = mflowtype; 2557 (*netp)->flowid = mflowid; 2558 } 2559 /* 2560 * Ok, we built an association so confirm the address we sent the 2561 * INIT-ACK to. 2562 */ 2563 netl = sctp_findnet(*stcb, to); 2564 /* 2565 * This code should in theory NOT run but 2566 */ 2567 if (netl == NULL) { 2568 /* TSNH! Huh, why do I need to add this address here? */ 2569 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2570 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2571 return (NULL); 2572 } 2573 netl = sctp_findnet(*stcb, to); 2574 } 2575 if (netl) { 2576 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2577 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2578 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2579 netl); 2580 send_int_conf = 1; 2581 } 2582 } 2583 sctp_start_net_timers(*stcb); 2584 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2585 if (!had_a_existing_tcb || 2586 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2587 /* 2588 * If we have a NEW cookie or the connect never 2589 * reached the connected state during collision we 2590 * must do the TCP accept thing. 2591 */ 2592 struct socket *so, *oso; 2593 struct sctp_inpcb *inp; 2594 2595 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2596 /* 2597 * For a restart we will keep the same 2598 * socket, no need to do anything. I THINK!! 2599 */ 2600 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2601 if (send_int_conf) { 2602 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2603 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2604 } 2605 return (m); 2606 } 2607 oso = (*inp_p)->sctp_socket; 2608 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2609 SCTP_TCB_UNLOCK((*stcb)); 2610 CURVNET_SET(oso->so_vnet); 2611 so = sonewconn(oso, 0 2612 ); 2613 CURVNET_RESTORE(); 2614 SCTP_TCB_LOCK((*stcb)); 2615 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2616 2617 if (so == NULL) { 2618 struct mbuf *op_err; 2619 2620 /* Too many sockets */ 2621 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2622 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2623 sctp_abort_association(*inp_p, NULL, m, iphlen, 2624 src, dst, sh, op_err, 2625 mflowtype, mflowid, 2626 vrf_id, port); 2627 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2628 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2629 return (NULL); 2630 } 2631 inp = (struct sctp_inpcb *)so->so_pcb; 2632 SCTP_INP_INCR_REF(inp); 2633 /* 2634 * We add the unbound flag here so that if we get an 2635 * soabort() before we get the move_pcb done, we 2636 * will properly cleanup. 2637 */ 2638 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2639 SCTP_PCB_FLAGS_CONNECTED | 2640 SCTP_PCB_FLAGS_IN_TCPPOOL | 2641 SCTP_PCB_FLAGS_UNBOUND | 2642 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2643 SCTP_PCB_FLAGS_DONT_WAKE); 2644 inp->sctp_features = (*inp_p)->sctp_features; 2645 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2646 inp->sctp_socket = so; 2647 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2648 inp->max_cwnd = (*inp_p)->max_cwnd; 2649 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2650 inp->ecn_supported = (*inp_p)->ecn_supported; 2651 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2652 inp->auth_supported = (*inp_p)->auth_supported; 2653 inp->asconf_supported = (*inp_p)->asconf_supported; 2654 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2655 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2656 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2657 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2658 inp->sctp_context = (*inp_p)->sctp_context; 2659 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2660 inp->fibnum = (*inp_p)->fibnum; 2661 /* 2662 * copy in the authentication parameters from the 2663 * original endpoint 2664 */ 2665 if (inp->sctp_ep.local_hmacs) 2666 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2667 inp->sctp_ep.local_hmacs = 2668 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2669 if (inp->sctp_ep.local_auth_chunks) 2670 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2671 inp->sctp_ep.local_auth_chunks = 2672 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2673 2674 /* 2675 * Now we must move it from one hash table to 2676 * another and get the tcb in the right place. 2677 */ 2678 2679 /* 2680 * This is where the one-2-one socket is put into 2681 * the accept state waiting for the accept! 2682 */ 2683 if (*stcb) { 2684 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2685 } 2686 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2687 2688 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2689 SCTP_TCB_UNLOCK((*stcb)); 2690 2691 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2692 0); 2693 SCTP_TCB_LOCK((*stcb)); 2694 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2695 2696 /* 2697 * now we must check to see if we were aborted while 2698 * the move was going on and the lock/unlock 2699 * happened. 2700 */ 2701 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2702 /* 2703 * yep it was, we leave the assoc attached 2704 * to the socket since the sctp_inpcb_free() 2705 * call will send an abort for us. 2706 */ 2707 SCTP_INP_DECR_REF(inp); 2708 return (NULL); 2709 } 2710 SCTP_INP_DECR_REF(inp); 2711 /* Switch over to the new guy */ 2712 *inp_p = inp; 2713 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2714 if (send_int_conf) { 2715 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2716 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2717 } 2718 2719 /* 2720 * Pull it from the incomplete queue and wake the 2721 * guy 2722 */ 2723 soisconnected(so); 2724 return (m); 2725 } 2726 } 2727 if (notification) { 2728 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2729 } 2730 if (send_int_conf) { 2731 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2732 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2733 } 2734 return (m); 2735 } 2736 2737 static void 2738 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2739 struct sctp_tcb *stcb, struct sctp_nets *net) 2740 { 2741 /* cp must not be used, others call this without a c-ack :-) */ 2742 struct sctp_association *asoc; 2743 struct sctp_tmit_chunk *chk; 2744 2745 SCTPDBG(SCTP_DEBUG_INPUT2, 2746 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2747 if ((stcb == NULL) || (net == NULL)) { 2748 return; 2749 } 2750 2751 asoc = &stcb->asoc; 2752 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2753 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2754 asoc->overall_error_count, 2755 0, 2756 SCTP_FROM_SCTP_INPUT, 2757 __LINE__); 2758 } 2759 sctp_stop_all_cookie_timers(stcb); 2760 sctp_toss_old_cookies(stcb, asoc); 2761 /* process according to association state */ 2762 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2763 /* state change only needed when I am in right state */ 2764 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2765 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2766 sctp_start_net_timers(stcb); 2767 /* update RTO */ 2768 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2769 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2770 if (asoc->overall_error_count == 0) { 2771 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2772 SCTP_RTT_FROM_NON_DATA); 2773 } 2774 /* 2775 * Since we did not send a HB make sure we don't double 2776 * things. 2777 */ 2778 asoc->overall_error_count = 0; 2779 net->hb_responded = 1; 2780 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2781 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2782 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2783 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2784 sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED); 2785 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2786 soisconnected(stcb->sctp_socket); 2787 } 2788 } 2789 2790 if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && 2791 TAILQ_EMPTY(&asoc->send_queue) && 2792 TAILQ_EMPTY(&asoc->sent_queue) && 2793 (asoc->stream_queue_cnt == 0)) { 2794 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 2795 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_SENT); 2796 sctp_stop_timers_for_shutdown(stcb); 2797 sctp_send_shutdown(stcb, net); 2798 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, 2799 stcb->sctp_ep, stcb, net); 2800 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2801 stcb->sctp_ep, stcb, NULL); 2802 sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_LOCKED); 2803 } 2804 2805 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2806 /* 2807 * We don't need to do the asconf thing, nor hb or 2808 * autoclose if the socket is closed. 2809 */ 2810 goto closed_socket; 2811 } 2812 2813 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2814 stcb, net); 2815 2816 if (stcb->asoc.sctp_autoclose_ticks && 2817 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2818 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2819 stcb->sctp_ep, stcb, NULL); 2820 } 2821 /* 2822 * send ASCONF if parameters are pending and ASCONFs are 2823 * allowed (eg. addresses changed when init/cookie echo were 2824 * in flight) 2825 */ 2826 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2827 (stcb->asoc.asconf_supported == 1) && 2828 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2829 #ifdef SCTP_TIMER_BASED_ASCONF 2830 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2831 stcb->sctp_ep, stcb, 2832 stcb->asoc.primary_destination); 2833 #else 2834 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2835 SCTP_ADDR_NOT_LOCKED); 2836 #endif 2837 } 2838 } 2839 closed_socket: 2840 /* Restart the timer if we have pending data */ 2841 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2842 if (chk->whoTo != NULL) { 2843 break; 2844 } 2845 } 2846 if (chk != NULL) { 2847 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2848 } 2849 } 2850 2851 static void 2852 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2853 struct sctp_tcb *stcb) 2854 { 2855 struct sctp_nets *net; 2856 struct sctp_tmit_chunk *lchk; 2857 struct sctp_ecne_chunk bkup; 2858 uint8_t override_bit; 2859 uint32_t tsn, window_data_tsn; 2860 int len; 2861 unsigned int pkt_cnt; 2862 2863 len = ntohs(cp->ch.chunk_length); 2864 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2865 /* Its the old format */ 2866 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2867 bkup.num_pkts_since_cwr = htonl(1); 2868 cp = &bkup; 2869 } 2870 SCTP_STAT_INCR(sctps_recvecne); 2871 tsn = ntohl(cp->tsn); 2872 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2873 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2874 if (lchk == NULL) { 2875 window_data_tsn = stcb->asoc.sending_seq - 1; 2876 } else { 2877 window_data_tsn = lchk->rec.data.tsn; 2878 } 2879 2880 /* Find where it was sent to if possible. */ 2881 net = NULL; 2882 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2883 if (lchk->rec.data.tsn == tsn) { 2884 net = lchk->whoTo; 2885 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2886 break; 2887 } 2888 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2889 break; 2890 } 2891 } 2892 if (net == NULL) { 2893 /* 2894 * What to do. A previous send of a CWR was possibly lost. 2895 * See how old it is, we may have it marked on the actual 2896 * net. 2897 */ 2898 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2899 if (tsn == net->last_cwr_tsn) { 2900 /* Found him, send it off */ 2901 break; 2902 } 2903 } 2904 if (net == NULL) { 2905 /* 2906 * If we reach here, we need to send a special CWR 2907 * that says hey, we did this a long time ago and 2908 * you lost the response. 2909 */ 2910 net = TAILQ_FIRST(&stcb->asoc.nets); 2911 if (net == NULL) { 2912 /* TSNH */ 2913 return; 2914 } 2915 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2916 } else { 2917 override_bit = 0; 2918 } 2919 } else { 2920 override_bit = 0; 2921 } 2922 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2923 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2924 /* 2925 * JRS - Use the congestion control given in the pluggable 2926 * CC module 2927 */ 2928 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2929 /* 2930 * We reduce once every RTT. So we will only lower cwnd at 2931 * the next sending seq i.e. the window_data_tsn 2932 */ 2933 net->cwr_window_tsn = window_data_tsn; 2934 net->ecn_ce_pkt_cnt += pkt_cnt; 2935 net->lost_cnt = pkt_cnt; 2936 net->last_cwr_tsn = tsn; 2937 } else { 2938 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2939 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2940 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2941 /* 2942 * Another loss in the same window update how many 2943 * marks/packets lost we have had. 2944 */ 2945 int cnt = 1; 2946 2947 if (pkt_cnt > net->lost_cnt) { 2948 /* Should be the case */ 2949 cnt = (pkt_cnt - net->lost_cnt); 2950 net->ecn_ce_pkt_cnt += cnt; 2951 } 2952 net->lost_cnt = pkt_cnt; 2953 net->last_cwr_tsn = tsn; 2954 /* 2955 * Most CC functions will ignore this call, since we 2956 * are in-window yet of the initial CE the peer saw. 2957 */ 2958 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2959 } 2960 } 2961 /* 2962 * We always send a CWR this way if our previous one was lost our 2963 * peer will get an update, or if it is not time again to reduce we 2964 * still get the cwr to the peer. Note we set the override when we 2965 * could not find the TSN on the chunk or the destination network. 2966 */ 2967 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2968 } 2969 2970 static void 2971 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2972 { 2973 /* 2974 * Here we get a CWR from the peer. We must look in the outqueue and 2975 * make sure that we have a covered ECNE in the control chunk part. 2976 * If so remove it. 2977 */ 2978 struct sctp_tmit_chunk *chk, *nchk; 2979 struct sctp_ecne_chunk *ecne; 2980 int override; 2981 uint32_t cwr_tsn; 2982 2983 cwr_tsn = ntohl(cp->tsn); 2984 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2985 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2986 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2987 continue; 2988 } 2989 if ((override == 0) && (chk->whoTo != net)) { 2990 /* Must be from the right src unless override is set */ 2991 continue; 2992 } 2993 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2994 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2995 /* this covers this ECNE, we can remove it */ 2996 stcb->asoc.ecn_echo_cnt_onq--; 2997 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2998 sctp_next); 2999 stcb->asoc.ctrl_queue_cnt--; 3000 sctp_m_freem(chk->data); 3001 chk->data = NULL; 3002 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3003 if (override == 0) { 3004 break; 3005 } 3006 } 3007 } 3008 } 3009 3010 static void 3011 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 3012 struct sctp_tcb *stcb, struct sctp_nets *net) 3013 { 3014 3015 SCTPDBG(SCTP_DEBUG_INPUT2, 3016 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 3017 if (stcb == NULL) 3018 return; 3019 3020 /* process according to association state */ 3021 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 3022 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 3023 SCTPDBG(SCTP_DEBUG_INPUT2, 3024 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 3025 SCTP_TCB_UNLOCK(stcb); 3026 return; 3027 } 3028 /* notify upper layer protocol */ 3029 if (stcb->sctp_socket) { 3030 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3031 } 3032 #ifdef INVARIANTS 3033 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3034 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3035 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3036 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3037 } 3038 #endif 3039 /* stop the timer */ 3040 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3041 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3042 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3043 /* free the TCB */ 3044 SCTPDBG(SCTP_DEBUG_INPUT2, 3045 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3046 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3047 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3048 return; 3049 } 3050 3051 static int 3052 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3053 struct sctp_nets *net, uint8_t flg) 3054 { 3055 switch (desc->chunk_type) { 3056 case SCTP_DATA: 3057 case SCTP_IDATA: 3058 /* find the tsn to resend (possibly) */ 3059 { 3060 uint32_t tsn; 3061 struct sctp_tmit_chunk *tp1; 3062 3063 tsn = ntohl(desc->tsn_ifany); 3064 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3065 if (tp1->rec.data.tsn == tsn) { 3066 /* found it */ 3067 break; 3068 } 3069 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3070 /* not found */ 3071 tp1 = NULL; 3072 break; 3073 } 3074 } 3075 if (tp1 == NULL) { 3076 /* 3077 * Do it the other way , aka without paying 3078 * attention to queue seq order. 3079 */ 3080 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3081 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3082 if (tp1->rec.data.tsn == tsn) { 3083 /* found it */ 3084 break; 3085 } 3086 } 3087 } 3088 if (tp1 == NULL) { 3089 SCTP_STAT_INCR(sctps_pdrptsnnf); 3090 } 3091 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3092 if (((flg & SCTP_BADCRC) == 0) && 3093 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3094 return (0); 3095 } 3096 if ((stcb->asoc.peers_rwnd == 0) && 3097 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3098 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3099 return (0); 3100 } 3101 if (stcb->asoc.peers_rwnd == 0 && 3102 (flg & SCTP_FROM_MIDDLE_BOX)) { 3103 SCTP_STAT_INCR(sctps_pdrpdizrw); 3104 return (0); 3105 } 3106 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3107 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3108 /* Payload not matching. */ 3109 SCTP_STAT_INCR(sctps_pdrpbadd); 3110 return (-1); 3111 } 3112 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3113 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3114 /* Payload not matching. */ 3115 SCTP_STAT_INCR(sctps_pdrpbadd); 3116 return (-1); 3117 } 3118 if (tp1->do_rtt) { 3119 /* 3120 * this guy had a RTO calculation 3121 * pending on it, cancel it 3122 */ 3123 if (tp1->whoTo->rto_needed == 0) { 3124 tp1->whoTo->rto_needed = 1; 3125 } 3126 tp1->do_rtt = 0; 3127 } 3128 SCTP_STAT_INCR(sctps_pdrpmark); 3129 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3130 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3131 /* 3132 * mark it as if we were doing a FR, since 3133 * we will be getting gap ack reports behind 3134 * the info from the router. 3135 */ 3136 tp1->rec.data.doing_fast_retransmit = 1; 3137 /* 3138 * mark the tsn with what sequences can 3139 * cause a new FR. 3140 */ 3141 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3142 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3143 } else { 3144 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3145 } 3146 3147 /* restart the timer */ 3148 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3149 stcb, tp1->whoTo, 3150 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3151 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3152 stcb, tp1->whoTo); 3153 3154 /* fix counts and things */ 3155 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3156 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3157 tp1->whoTo->flight_size, 3158 tp1->book_size, 3159 (uint32_t)(uintptr_t)stcb, 3160 tp1->rec.data.tsn); 3161 } 3162 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3163 sctp_flight_size_decrease(tp1); 3164 sctp_total_flight_decrease(stcb, tp1); 3165 } 3166 tp1->sent = SCTP_DATAGRAM_RESEND; 3167 } { 3168 /* audit code */ 3169 unsigned int audit; 3170 3171 audit = 0; 3172 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3173 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3174 audit++; 3175 } 3176 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3177 sctp_next) { 3178 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3179 audit++; 3180 } 3181 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3182 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3183 audit, stcb->asoc.sent_queue_retran_cnt); 3184 #ifndef SCTP_AUDITING_ENABLED 3185 stcb->asoc.sent_queue_retran_cnt = audit; 3186 #endif 3187 } 3188 } 3189 } 3190 break; 3191 case SCTP_ASCONF: 3192 { 3193 struct sctp_tmit_chunk *asconf; 3194 3195 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3196 sctp_next) { 3197 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3198 break; 3199 } 3200 } 3201 if (asconf) { 3202 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3203 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3204 asconf->sent = SCTP_DATAGRAM_RESEND; 3205 asconf->snd_count--; 3206 } 3207 } 3208 break; 3209 case SCTP_INITIATION: 3210 /* resend the INIT */ 3211 stcb->asoc.dropped_special_cnt++; 3212 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3213 /* 3214 * If we can get it in, in a few attempts we do 3215 * this, otherwise we let the timer fire. 3216 */ 3217 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3218 stcb, net, 3219 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3220 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3221 } 3222 break; 3223 case SCTP_SELECTIVE_ACK: 3224 case SCTP_NR_SELECTIVE_ACK: 3225 /* resend the sack */ 3226 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3227 break; 3228 case SCTP_HEARTBEAT_REQUEST: 3229 /* resend a demand HB */ 3230 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3231 /* 3232 * Only retransmit if we KNOW we wont destroy the 3233 * tcb 3234 */ 3235 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3236 } 3237 break; 3238 case SCTP_SHUTDOWN: 3239 sctp_send_shutdown(stcb, net); 3240 break; 3241 case SCTP_SHUTDOWN_ACK: 3242 sctp_send_shutdown_ack(stcb, net); 3243 break; 3244 case SCTP_COOKIE_ECHO: 3245 { 3246 struct sctp_tmit_chunk *cookie; 3247 3248 cookie = NULL; 3249 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3250 sctp_next) { 3251 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3252 break; 3253 } 3254 } 3255 if (cookie) { 3256 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3257 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3258 cookie->sent = SCTP_DATAGRAM_RESEND; 3259 sctp_stop_all_cookie_timers(stcb); 3260 } 3261 } 3262 break; 3263 case SCTP_COOKIE_ACK: 3264 sctp_send_cookie_ack(stcb); 3265 break; 3266 case SCTP_ASCONF_ACK: 3267 /* resend last asconf ack */ 3268 sctp_send_asconf_ack(stcb); 3269 break; 3270 case SCTP_IFORWARD_CUM_TSN: 3271 case SCTP_FORWARD_CUM_TSN: 3272 send_forward_tsn(stcb, &stcb->asoc); 3273 break; 3274 /* can't do anything with these */ 3275 case SCTP_PACKET_DROPPED: 3276 case SCTP_INITIATION_ACK: /* this should not happen */ 3277 case SCTP_HEARTBEAT_ACK: 3278 case SCTP_ABORT_ASSOCIATION: 3279 case SCTP_OPERATION_ERROR: 3280 case SCTP_SHUTDOWN_COMPLETE: 3281 case SCTP_ECN_ECHO: 3282 case SCTP_ECN_CWR: 3283 default: 3284 break; 3285 } 3286 return (0); 3287 } 3288 3289 void 3290 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3291 { 3292 uint32_t i; 3293 uint16_t temp; 3294 3295 /* 3296 * We set things to 0xffffffff since this is the last delivered 3297 * sequence and we will be sending in 0 after the reset. 3298 */ 3299 3300 if (number_entries) { 3301 for (i = 0; i < number_entries; i++) { 3302 temp = ntohs(list[i]); 3303 if (temp >= stcb->asoc.streamincnt) { 3304 continue; 3305 } 3306 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3307 } 3308 } else { 3309 list = NULL; 3310 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3311 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3312 } 3313 } 3314 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3315 } 3316 3317 static void 3318 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3319 { 3320 uint32_t i; 3321 uint16_t temp; 3322 3323 if (number_entries > 0) { 3324 for (i = 0; i < number_entries; i++) { 3325 temp = ntohs(list[i]); 3326 if (temp >= stcb->asoc.streamoutcnt) { 3327 /* no such stream */ 3328 continue; 3329 } 3330 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3331 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3332 } 3333 } else { 3334 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3335 stcb->asoc.strmout[i].next_mid_ordered = 0; 3336 stcb->asoc.strmout[i].next_mid_unordered = 0; 3337 } 3338 } 3339 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3340 } 3341 3342 static void 3343 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3344 { 3345 uint32_t i; 3346 uint16_t temp; 3347 3348 if (number_entries > 0) { 3349 for (i = 0; i < number_entries; i++) { 3350 temp = ntohs(list[i]); 3351 if (temp >= stcb->asoc.streamoutcnt) { 3352 /* no such stream */ 3353 continue; 3354 } 3355 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3356 } 3357 } else { 3358 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3359 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3360 } 3361 } 3362 } 3363 3364 struct sctp_stream_reset_request * 3365 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3366 { 3367 struct sctp_association *asoc; 3368 struct sctp_chunkhdr *ch; 3369 struct sctp_stream_reset_request *r; 3370 struct sctp_tmit_chunk *chk; 3371 int len, clen; 3372 3373 asoc = &stcb->asoc; 3374 chk = asoc->str_reset; 3375 if (TAILQ_EMPTY(&asoc->control_send_queue) || 3376 (chk == NULL)) { 3377 asoc->stream_reset_outstanding = 0; 3378 return (NULL); 3379 } 3380 if (chk->data == NULL) { 3381 return (NULL); 3382 } 3383 if (bchk != NULL) { 3384 /* he wants a copy of the chk pointer */ 3385 *bchk = chk; 3386 } 3387 clen = chk->send_size; 3388 ch = mtod(chk->data, struct sctp_chunkhdr *); 3389 r = (struct sctp_stream_reset_request *)(ch + 1); 3390 if (ntohl(r->request_seq) == seq) { 3391 /* found it */ 3392 return (r); 3393 } 3394 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3395 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3396 /* move to the next one, there can only be a max of two */ 3397 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3398 if (ntohl(r->request_seq) == seq) { 3399 return (r); 3400 } 3401 } 3402 /* that seq is not here */ 3403 return (NULL); 3404 } 3405 3406 static void 3407 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3408 { 3409 struct sctp_association *asoc; 3410 struct sctp_tmit_chunk *chk; 3411 3412 asoc = &stcb->asoc; 3413 chk = asoc->str_reset; 3414 if (chk == NULL) { 3415 return; 3416 } 3417 asoc->str_reset = NULL; 3418 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3419 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3420 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3421 asoc->ctrl_queue_cnt--; 3422 if (chk->data) { 3423 sctp_m_freem(chk->data); 3424 chk->data = NULL; 3425 } 3426 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3427 } 3428 3429 static int 3430 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3431 uint32_t seq, uint32_t action, 3432 struct sctp_stream_reset_response *respin) 3433 { 3434 uint16_t type; 3435 int lparam_len; 3436 struct sctp_association *asoc = &stcb->asoc; 3437 struct sctp_tmit_chunk *chk; 3438 struct sctp_stream_reset_request *req_param; 3439 struct sctp_stream_reset_out_request *req_out_param; 3440 struct sctp_stream_reset_in_request *req_in_param; 3441 uint32_t number_entries; 3442 3443 if (asoc->stream_reset_outstanding == 0) { 3444 /* duplicate */ 3445 return (0); 3446 } 3447 if (seq == stcb->asoc.str_reset_seq_out) { 3448 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3449 if (req_param != NULL) { 3450 stcb->asoc.str_reset_seq_out++; 3451 type = ntohs(req_param->ph.param_type); 3452 lparam_len = ntohs(req_param->ph.param_length); 3453 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3454 int no_clear = 0; 3455 3456 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3457 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3458 asoc->stream_reset_out_is_outstanding = 0; 3459 if (asoc->stream_reset_outstanding) 3460 asoc->stream_reset_outstanding--; 3461 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3462 /* do it */ 3463 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3464 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3465 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3466 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3467 /* 3468 * Set it up so we don't stop 3469 * retransmitting 3470 */ 3471 asoc->stream_reset_outstanding++; 3472 stcb->asoc.str_reset_seq_out--; 3473 asoc->stream_reset_out_is_outstanding = 1; 3474 no_clear = 1; 3475 } else { 3476 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3477 } 3478 if (no_clear == 0) { 3479 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3480 } 3481 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3482 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3483 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3484 if (asoc->stream_reset_outstanding) 3485 asoc->stream_reset_outstanding--; 3486 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3487 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3488 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3489 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3490 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3491 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3492 } 3493 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3494 /* Ok we now may have more streams */ 3495 int num_stream; 3496 3497 num_stream = stcb->asoc.strm_pending_add_size; 3498 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3499 /* TSNH */ 3500 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3501 } 3502 stcb->asoc.strm_pending_add_size = 0; 3503 if (asoc->stream_reset_outstanding) 3504 asoc->stream_reset_outstanding--; 3505 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3506 /* Put the new streams into effect */ 3507 int i; 3508 3509 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3510 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3511 } 3512 asoc->streamoutcnt += num_stream; 3513 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3514 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3515 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED); 3516 } else { 3517 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_FAILED, NULL, SCTP_SO_NOT_LOCKED); 3518 } 3519 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3520 if (asoc->stream_reset_outstanding) 3521 asoc->stream_reset_outstanding--; 3522 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3523 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED); 3524 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3525 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, SCTP_STREAM_CHANGE_DENIED, NULL, SCTP_SO_NOT_LOCKED); 3526 } 3527 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3528 /** 3529 * a) Adopt the new in tsn. 3530 * b) reset the map 3531 * c) Adopt the new out-tsn 3532 */ 3533 struct sctp_stream_reset_response_tsn *resp; 3534 struct sctp_forward_tsn_chunk fwdtsn; 3535 int abort_flag = 0; 3536 3537 if (respin == NULL) { 3538 /* huh ? */ 3539 return (0); 3540 } 3541 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3542 return (0); 3543 } 3544 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3545 resp = (struct sctp_stream_reset_response_tsn *)respin; 3546 asoc->stream_reset_outstanding--; 3547 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3548 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3549 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3550 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3551 if (abort_flag) { 3552 return (1); 3553 } 3554 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3555 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3556 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3557 } 3558 3559 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3560 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3561 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3562 3563 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3564 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3565 3566 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3567 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3568 3569 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3570 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3571 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3572 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3573 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, SCTP_ASSOC_RESET_DENIED, NULL, SCTP_SO_NOT_LOCKED); 3574 } else { 3575 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, SCTP_ASSOC_RESET_FAILED, NULL, SCTP_SO_NOT_LOCKED); 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_ulp_notify(SCTP_NOTIFY_STR_RESET_TSN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 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_ulp_notify(SCTP_NOTIFY_STR_RESET_ADD, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 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) { 5368 goto validate_cksum; 5369 } 5370 if (stcb->asoc.rcv_edmid == SCTP_EDMID_NONE) { 5371 goto validate_cksum; 5372 } 5373 KASSERT(stcb->asoc.rcv_edmid == SCTP_EDMID_LOWER_LAYER_DTLS, 5374 ("Unexpected EDMID %u", stcb->asoc.rcv_edmid)); 5375 SCTP_STAT_INCR(sctps_recvzerocrc); 5376 } 5377 } 5378 cksum_validated: 5379 /* Destination port of 0 is illegal, based on RFC4960. */ 5380 if (sh->dest_port == htons(0)) { 5381 SCTP_STAT_INCR(sctps_hdrops); 5382 if ((stcb == NULL) && (inp != NULL)) { 5383 inp_decr = inp; 5384 } 5385 goto out; 5386 } 5387 if (!stcb_looked_up) { 5388 stcb = sctp_findassociation_addr(m, offset, src, dst, 5389 sh, ch, &inp, &net, vrf_id); 5390 } 5391 #if defined(INET) || defined(INET6) 5392 if ((ch->chunk_type != SCTP_INITIATION) && 5393 (net != NULL) && (net->port != port)) { 5394 if (net->port == 0) { 5395 /* UDP encapsulation turned on. */ 5396 net->mtu -= sizeof(struct udphdr); 5397 if (stcb->asoc.smallest_mtu > net->mtu) { 5398 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5399 } 5400 } else if (port == 0) { 5401 /* UDP encapsulation turned off. */ 5402 net->mtu += sizeof(struct udphdr); 5403 /* XXX Update smallest_mtu */ 5404 } 5405 net->port = port; 5406 } 5407 #endif 5408 if (net != NULL) { 5409 net->flowtype = mflowtype; 5410 net->flowid = mflowid; 5411 } 5412 if (inp == NULL) { 5413 SCTP_STAT_INCR(sctps_noport); 5414 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5415 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5416 goto out; 5417 } 5418 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5419 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5420 sctp_send_shutdown_complete2(src, dst, sh, 5421 mflowtype, mflowid, fibnum, 5422 vrf_id, port); 5423 goto out; 5424 } 5425 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5426 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 5427 goto out; 5428 } 5429 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5430 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5431 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5432 (ch->chunk_type != SCTP_INIT))) { 5433 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5434 "Out of the blue"); 5435 sctp_send_abort(m, iphlen, src, dst, 5436 sh, 0, op_err, 5437 mflowtype, mflowid, fibnum, 5438 vrf_id, port); 5439 } 5440 } 5441 goto out; 5442 } else if (stcb == NULL) { 5443 inp_decr = inp; 5444 } 5445 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5446 (void *)m, iphlen, offset, length, (void *)stcb); 5447 if (stcb) { 5448 /* always clear this before beginning a packet */ 5449 stcb->asoc.authenticated = 0; 5450 stcb->asoc.seen_a_sack_this_pkt = 0; 5451 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5452 (void *)stcb, stcb->asoc.state); 5453 5454 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5455 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5456 /*- 5457 * If we hit here, we had a ref count 5458 * up when the assoc was aborted and the 5459 * timer is clearing out the assoc, we should 5460 * NOT respond to any packet.. its OOTB. 5461 */ 5462 SCTP_TCB_UNLOCK(stcb); 5463 stcb = NULL; 5464 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5465 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5466 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5467 msg); 5468 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5469 mflowtype, mflowid, inp->fibnum, 5470 vrf_id, port); 5471 goto out; 5472 } 5473 } 5474 if (IS_SCTP_CONTROL(ch)) { 5475 /* process the control portion of the SCTP packet */ 5476 /* sa_ignore NO_NULL_CHK */ 5477 stcb = sctp_process_control(m, iphlen, &offset, length, 5478 src, dst, sh, ch, 5479 inp, stcb, &net, &fwd_tsn_seen, 5480 mflowtype, mflowid, fibnum, 5481 vrf_id, port); 5482 if (stcb) { 5483 /* 5484 * This covers us if the cookie-echo was there and 5485 * it changes our INP. 5486 */ 5487 inp = stcb->sctp_ep; 5488 #if defined(INET) || defined(INET6) 5489 if ((ch->chunk_type != SCTP_INITIATION) && 5490 (net != NULL) && (net->port != port)) { 5491 if (net->port == 0) { 5492 /* UDP encapsulation turned on. */ 5493 net->mtu -= sizeof(struct udphdr); 5494 if (stcb->asoc.smallest_mtu > net->mtu) { 5495 sctp_pathmtu_adjustment(stcb, net->mtu, true); 5496 } 5497 } else if (port == 0) { 5498 /* UDP encapsulation turned off. */ 5499 net->mtu += sizeof(struct udphdr); 5500 /* XXX Update smallest_mtu */ 5501 } 5502 net->port = port; 5503 } 5504 #endif 5505 } 5506 } else { 5507 /* 5508 * no control chunks, so pre-process DATA chunks (these 5509 * checks are taken care of by control processing) 5510 */ 5511 5512 /* 5513 * if DATA only packet, and auth is required, then punt... 5514 * can't have authenticated without any AUTH (control) 5515 * chunks 5516 */ 5517 if ((stcb != NULL) && 5518 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5519 /* "silently" ignore */ 5520 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5521 SCTP_STAT_INCR(sctps_recvauthmissing); 5522 goto out; 5523 } 5524 if (stcb == NULL) { 5525 /* out of the blue DATA chunk */ 5526 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5527 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5528 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5529 msg); 5530 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5531 mflowtype, mflowid, fibnum, 5532 vrf_id, port); 5533 goto out; 5534 } 5535 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5536 /* v_tag mismatch! */ 5537 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5538 SCTP_STAT_INCR(sctps_badvtag); 5539 goto out; 5540 } 5541 } 5542 5543 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5544 if (stcb == NULL) { 5545 /* 5546 * no valid TCB for this packet, or we found it's a bad 5547 * packet while processing control, or we're done with this 5548 * packet (done or skip rest of data), so we drop it... 5549 */ 5550 goto out; 5551 } 5552 5553 /* 5554 * DATA chunk processing 5555 */ 5556 /* plow through the data chunks while length > offset */ 5557 5558 /* 5559 * Rest should be DATA only. Check authentication state if AUTH for 5560 * DATA is required. 5561 */ 5562 if ((length > offset) && 5563 (stcb != NULL) && 5564 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5565 !stcb->asoc.authenticated) { 5566 /* "silently" ignore */ 5567 SCTP_STAT_INCR(sctps_recvauthmissing); 5568 SCTPDBG(SCTP_DEBUG_AUTH1, 5569 "Data chunk requires AUTH, skipped\n"); 5570 goto trigger_send; 5571 } 5572 if (length > offset) { 5573 int retval; 5574 5575 /* 5576 * First check to make sure our state is correct. We would 5577 * not get here unless we really did have a tag, so we don't 5578 * abort if this happens, just dump the chunk silently. 5579 */ 5580 switch (SCTP_GET_STATE(stcb)) { 5581 case SCTP_STATE_COOKIE_ECHOED: 5582 /* 5583 * we consider data with valid tags in this state 5584 * shows us the cookie-ack was lost. Imply it was 5585 * there. 5586 */ 5587 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5588 break; 5589 case SCTP_STATE_COOKIE_WAIT: 5590 /* 5591 * We consider OOTB any data sent during asoc setup. 5592 */ 5593 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5594 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5595 msg); 5596 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5597 mflowtype, mflowid, inp->fibnum, 5598 vrf_id, port); 5599 goto out; 5600 /* sa_ignore NOTREACHED */ 5601 break; 5602 case SCTP_STATE_EMPTY: /* should not happen */ 5603 case SCTP_STATE_INUSE: /* should not happen */ 5604 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5605 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5606 default: 5607 goto out; 5608 /* sa_ignore NOTREACHED */ 5609 break; 5610 case SCTP_STATE_OPEN: 5611 case SCTP_STATE_SHUTDOWN_SENT: 5612 break; 5613 } 5614 /* plow through the data chunks while length > offset */ 5615 retval = sctp_process_data(mm, iphlen, &offset, length, 5616 inp, stcb, net, &high_tsn); 5617 if (retval == 2) { 5618 /* 5619 * The association aborted, NO UNLOCK needed since 5620 * the association is destroyed. 5621 */ 5622 stcb = NULL; 5623 goto out; 5624 } 5625 if (retval == 0) { 5626 data_processed = 1; 5627 } 5628 /* 5629 * Anything important needs to have been m_copy'ed in 5630 * process_data 5631 */ 5632 } 5633 5634 /* take care of ecn */ 5635 if ((data_processed == 1) && 5636 (stcb->asoc.ecn_supported == 1) && 5637 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5638 /* Yep, we need to add a ECNE */ 5639 sctp_send_ecn_echo(stcb, net, high_tsn); 5640 } 5641 5642 if ((data_processed == 0) && (fwd_tsn_seen)) { 5643 int was_a_gap; 5644 uint32_t highest_tsn; 5645 5646 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5647 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5648 } else { 5649 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5650 } 5651 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5652 stcb->asoc.send_sack = 1; 5653 sctp_sack_check(stcb, was_a_gap); 5654 } else if (fwd_tsn_seen) { 5655 stcb->asoc.send_sack = 1; 5656 } 5657 /* trigger send of any chunks in queue... */ 5658 trigger_send: 5659 #ifdef SCTP_AUDITING_ENABLED 5660 sctp_audit_log(0xE0, 2); 5661 sctp_auditing(1, inp, stcb, net); 5662 #endif 5663 SCTPDBG(SCTP_DEBUG_INPUT1, 5664 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5665 stcb->asoc.peers_rwnd, 5666 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5667 stcb->asoc.total_flight); 5668 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5669 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5670 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5671 } 5672 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5673 cnt_ctrl_ready || 5674 stcb->asoc.trigger_reset || 5675 ((un_sent > 0) && 5676 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5677 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5678 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5679 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5680 } 5681 #ifdef SCTP_AUDITING_ENABLED 5682 sctp_audit_log(0xE0, 3); 5683 sctp_auditing(2, inp, stcb, net); 5684 #endif 5685 out: 5686 if (stcb != NULL) { 5687 SCTP_TCB_UNLOCK(stcb); 5688 } 5689 if (inp_decr != NULL) { 5690 /* reduce ref-count */ 5691 SCTP_INP_WLOCK(inp_decr); 5692 SCTP_INP_DECR_REF(inp_decr); 5693 SCTP_INP_WUNLOCK(inp_decr); 5694 } 5695 return; 5696 } 5697 5698 #ifdef INET 5699 void 5700 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5701 { 5702 struct mbuf *m; 5703 int iphlen; 5704 uint32_t vrf_id = 0; 5705 uint8_t ecn_bits; 5706 struct sockaddr_in src, dst; 5707 struct ip *ip; 5708 struct sctphdr *sh; 5709 struct sctp_chunkhdr *ch; 5710 int length, offset; 5711 uint8_t compute_crc; 5712 uint32_t mflowid; 5713 uint8_t mflowtype; 5714 uint16_t fibnum; 5715 5716 iphlen = off; 5717 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5718 SCTP_RELEASE_PKT(i_pak); 5719 return; 5720 } 5721 m = SCTP_HEADER_TO_CHAIN(i_pak); 5722 #ifdef SCTP_MBUF_LOGGING 5723 /* Log in any input mbufs */ 5724 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5725 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5726 } 5727 #endif 5728 #ifdef SCTP_PACKET_LOGGING 5729 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5730 sctp_packet_log(m); 5731 } 5732 #endif 5733 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5734 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5735 m->m_pkthdr.len, 5736 if_name(m->m_pkthdr.rcvif), 5737 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5738 mflowid = m->m_pkthdr.flowid; 5739 mflowtype = M_HASHTYPE_GET(m); 5740 fibnum = M_GETFIB(m); 5741 SCTP_STAT_INCR(sctps_recvpackets); 5742 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5743 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5744 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5745 if (SCTP_BUF_LEN(m) < offset) { 5746 if ((m = m_pullup(m, offset)) == NULL) { 5747 SCTP_STAT_INCR(sctps_hdrops); 5748 return; 5749 } 5750 } 5751 ip = mtod(m, struct ip *); 5752 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5753 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5754 offset -= sizeof(struct sctp_chunkhdr); 5755 memset(&src, 0, sizeof(struct sockaddr_in)); 5756 src.sin_family = AF_INET; 5757 src.sin_len = sizeof(struct sockaddr_in); 5758 src.sin_port = sh->src_port; 5759 src.sin_addr = ip->ip_src; 5760 memset(&dst, 0, sizeof(struct sockaddr_in)); 5761 dst.sin_family = AF_INET; 5762 dst.sin_len = sizeof(struct sockaddr_in); 5763 dst.sin_port = sh->dest_port; 5764 dst.sin_addr = ip->ip_dst; 5765 length = ntohs(ip->ip_len); 5766 /* Validate mbuf chain length with IP payload length. */ 5767 if (SCTP_HEADER_LEN(m) != length) { 5768 SCTPDBG(SCTP_DEBUG_INPUT1, 5769 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5770 SCTP_STAT_INCR(sctps_hdrops); 5771 goto out; 5772 } 5773 /* SCTP does not allow broadcasts or multicasts */ 5774 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5775 goto out; 5776 } 5777 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5778 goto out; 5779 } 5780 ecn_bits = ip->ip_tos; 5781 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5782 SCTP_STAT_INCR(sctps_recvhwcrc); 5783 compute_crc = 0; 5784 } else { 5785 SCTP_STAT_INCR(sctps_recvswcrc); 5786 compute_crc = 1; 5787 } 5788 sctp_common_input_processing(&m, iphlen, offset, length, 5789 (struct sockaddr *)&src, 5790 (struct sockaddr *)&dst, 5791 sh, ch, 5792 compute_crc, 5793 ecn_bits, 5794 mflowtype, mflowid, fibnum, 5795 vrf_id, port); 5796 out: 5797 if (m) { 5798 sctp_m_freem(m); 5799 } 5800 return; 5801 } 5802 5803 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5804 extern int *sctp_cpuarry; 5805 #endif 5806 5807 int 5808 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5809 { 5810 struct mbuf *m; 5811 int off; 5812 5813 m = *mp; 5814 off = *offp; 5815 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5816 if (mp_ncpus > 1) { 5817 struct ip *ip; 5818 struct sctphdr *sh; 5819 int offset; 5820 int cpu_to_use; 5821 uint32_t flowid, tag; 5822 5823 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5824 flowid = m->m_pkthdr.flowid; 5825 } else { 5826 /* 5827 * No flow id built by lower layers fix it so we 5828 * create one. 5829 */ 5830 offset = off + sizeof(struct sctphdr); 5831 if (SCTP_BUF_LEN(m) < offset) { 5832 if ((m = m_pullup(m, offset)) == NULL) { 5833 SCTP_STAT_INCR(sctps_hdrops); 5834 return (IPPROTO_DONE); 5835 } 5836 } 5837 ip = mtod(m, struct ip *); 5838 sh = (struct sctphdr *)((caddr_t)ip + off); 5839 tag = htonl(sh->v_tag); 5840 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5841 m->m_pkthdr.flowid = flowid; 5842 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5843 } 5844 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5845 sctp_queue_to_mcore(m, off, cpu_to_use); 5846 return (IPPROTO_DONE); 5847 } 5848 #endif 5849 sctp_input_with_port(m, off, 0); 5850 return (IPPROTO_DONE); 5851 } 5852 #endif 5853