1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved. 6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are met: 10 * 11 * a) Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * b) Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the distribution. 17 * 18 * c) Neither the name of Cisco Systems, Inc. nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 32 * THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <netinet/sctp_os.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_sysctl.h> 41 #include <netinet/sctp_pcb.h> 42 #include <netinet/sctp_header.h> 43 #include <netinet/sctputil.h> 44 #include <netinet/sctp_output.h> 45 #include <netinet/sctp_input.h> 46 #include <netinet/sctp_auth.h> 47 #include <netinet/sctp_indata.h> 48 #include <netinet/sctp_asconf.h> 49 #include <netinet/sctp_bsd_addr.h> 50 #include <netinet/sctp_timer.h> 51 #include <netinet/sctp_crc32.h> 52 #include <netinet/sctp_kdtrace.h> 53 #if defined(INET) || defined(INET6) 54 #include <netinet/udp.h> 55 #endif 56 #include <sys/smp.h> 57 58 static void 59 sctp_stop_all_cookie_timers(struct sctp_tcb *stcb) 60 { 61 struct sctp_nets *net; 62 63 /* 64 * This now not only stops all cookie timers it also stops any INIT 65 * timers as well. This will make sure that the timers are stopped 66 * in all collision cases. 67 */ 68 SCTP_TCB_LOCK_ASSERT(stcb); 69 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 70 if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) { 71 sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE, 72 stcb->sctp_ep, 73 stcb, 74 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1); 75 } else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) { 76 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, 77 stcb->sctp_ep, 78 stcb, 79 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2); 80 } 81 } 82 } 83 84 /* INIT handler */ 85 static void 86 sctp_handle_init(struct mbuf *m, int iphlen, int offset, 87 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 88 struct sctp_init_chunk *cp, struct sctp_inpcb *inp, 89 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_no_unlock, 90 uint8_t mflowtype, uint32_t mflowid, 91 uint32_t vrf_id, uint16_t port) 92 { 93 struct sctp_init *init; 94 struct mbuf *op_err; 95 96 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n", 97 (void *)stcb); 98 if (stcb == NULL) { 99 SCTP_INP_RLOCK(inp); 100 } 101 /* validate length */ 102 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_chunk)) { 103 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 104 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 105 mflowtype, mflowid, 106 vrf_id, port); 107 if (stcb) 108 *abort_no_unlock = 1; 109 goto outnow; 110 } 111 /* validate parameters */ 112 init = &cp->init; 113 if (init->initiate_tag == 0) { 114 /* protocol error... send abort */ 115 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 116 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 117 mflowtype, mflowid, 118 vrf_id, port); 119 if (stcb) 120 *abort_no_unlock = 1; 121 goto outnow; 122 } 123 if (ntohl(init->a_rwnd) < SCTP_MIN_RWND) { 124 /* invalid parameter... send abort */ 125 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 126 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 127 mflowtype, mflowid, 128 vrf_id, port); 129 if (stcb) 130 *abort_no_unlock = 1; 131 goto outnow; 132 } 133 if (init->num_inbound_streams == 0) { 134 /* protocol error... send abort */ 135 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 136 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 137 mflowtype, mflowid, 138 vrf_id, port); 139 if (stcb) 140 *abort_no_unlock = 1; 141 goto outnow; 142 } 143 if (init->num_outbound_streams == 0) { 144 /* protocol error... send abort */ 145 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 146 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 147 mflowtype, mflowid, 148 vrf_id, port); 149 if (stcb) 150 *abort_no_unlock = 1; 151 goto outnow; 152 } 153 if (sctp_validate_init_auth_params(m, offset + sizeof(*cp), 154 offset + ntohs(cp->ch.chunk_length))) { 155 /* auth parameter(s) error... send abort */ 156 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 157 "Problem with AUTH parameters"); 158 sctp_abort_association(inp, stcb, m, iphlen, src, dst, sh, op_err, 159 mflowtype, mflowid, 160 vrf_id, port); 161 if (stcb) 162 *abort_no_unlock = 1; 163 goto outnow; 164 } 165 /* We are only accepting if we have a listening socket. */ 166 if ((stcb == NULL) && 167 ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 168 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || 169 (!SCTP_IS_LISTENING(inp)))) { 170 /* 171 * FIX ME ?? What about TCP model and we have a 172 * match/restart case? Actually no fix is needed. the lookup 173 * will always find the existing assoc so stcb would not be 174 * NULL. It may be questionable to do this since we COULD 175 * just send back the INIT-ACK and hope that the app did 176 * accept()'s by the time the COOKIE was sent. But there is 177 * a price to pay for COOKIE generation and I don't want to 178 * pay it on the chance that the app will actually do some 179 * accepts(). The App just looses and should NOT be in this 180 * state :-) 181 */ 182 if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) { 183 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 184 "No listener"); 185 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 186 mflowtype, mflowid, inp->fibnum, 187 vrf_id, port); 188 } 189 goto outnow; 190 } 191 if ((stcb != NULL) && 192 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) { 193 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n"); 194 sctp_send_shutdown_ack(stcb, NULL); 195 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 196 } else { 197 SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n"); 198 sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset, 199 src, dst, sh, cp, 200 mflowtype, mflowid, 201 vrf_id, port); 202 } 203 outnow: 204 if (stcb == NULL) { 205 SCTP_INP_RUNLOCK(inp); 206 } 207 } 208 209 /* 210 * process peer "INIT/INIT-ACK" chunk returns value < 0 on error 211 */ 212 213 int 214 sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked) 215 { 216 int unsent_data; 217 unsigned int i; 218 struct sctp_stream_queue_pending *sp; 219 struct sctp_association *asoc; 220 221 /* 222 * This function returns if any stream has true unsent data on it. 223 * Note that as it looks through it will clean up any places that 224 * have old data that has been sent but left at top of stream queue. 225 */ 226 asoc = &stcb->asoc; 227 unsent_data = 0; 228 SCTP_TCB_SEND_LOCK(stcb); 229 if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) { 230 /* Check to see if some data queued */ 231 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 232 /* sa_ignore FREED_MEMORY */ 233 sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue); 234 if (sp == NULL) { 235 continue; 236 } 237 if ((sp->msg_is_complete) && 238 (sp->length == 0) && 239 (sp->sender_all_done)) { 240 /* 241 * We are doing differed cleanup. Last time 242 * through when we took all the data the 243 * sender_all_done was not set. 244 */ 245 if (sp->put_last_out == 0) { 246 SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n"); 247 SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n", 248 sp->sender_all_done, 249 sp->length, 250 sp->msg_is_complete, 251 sp->put_last_out); 252 } 253 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 254 TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next); 255 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp, 1); 256 if (sp->net) { 257 sctp_free_remote_addr(sp->net); 258 sp->net = NULL; 259 } 260 if (sp->data) { 261 sctp_m_freem(sp->data); 262 sp->data = NULL; 263 } 264 sctp_free_a_strmoq(stcb, sp, so_locked); 265 if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) { 266 unsent_data++; 267 } 268 } else { 269 unsent_data++; 270 } 271 if (unsent_data > 0) { 272 break; 273 } 274 } 275 } 276 SCTP_TCB_SEND_UNLOCK(stcb); 277 return (unsent_data); 278 } 279 280 static int 281 sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb) 282 { 283 struct sctp_init *init; 284 struct sctp_association *asoc; 285 struct sctp_nets *lnet; 286 unsigned int i; 287 288 init = &cp->init; 289 asoc = &stcb->asoc; 290 /* save off parameters */ 291 asoc->peer_vtag = ntohl(init->initiate_tag); 292 asoc->peers_rwnd = ntohl(init->a_rwnd); 293 /* init tsn's */ 294 asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1; 295 296 if (!TAILQ_EMPTY(&asoc->nets)) { 297 /* update any ssthresh's that may have a default */ 298 TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) { 299 lnet->ssthresh = asoc->peers_rwnd; 300 if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE | SCTP_CWND_LOGGING_ENABLE)) { 301 sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION); 302 } 303 } 304 } 305 SCTP_TCB_SEND_LOCK(stcb); 306 if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) { 307 unsigned int newcnt; 308 struct sctp_stream_out *outs; 309 struct sctp_stream_queue_pending *sp, *nsp; 310 struct sctp_tmit_chunk *chk, *nchk; 311 312 /* abandon the upper streams */ 313 newcnt = ntohs(init->num_inbound_streams); 314 TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) { 315 if (chk->rec.data.sid >= newcnt) { 316 TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next); 317 asoc->send_queue_cnt--; 318 if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) { 319 asoc->strmout[chk->rec.data.sid].chunks_on_queues--; 320 #ifdef INVARIANTS 321 } else { 322 panic("No chunks on the queues for sid %u.", chk->rec.data.sid); 323 #endif 324 } 325 if (chk->data != NULL) { 326 sctp_free_bufspace(stcb, asoc, chk, 1); 327 sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb, 328 0, chk, SCTP_SO_NOT_LOCKED); 329 if (chk->data) { 330 sctp_m_freem(chk->data); 331 chk->data = NULL; 332 } 333 } 334 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 335 /* sa_ignore FREED_MEMORY */ 336 } 337 } 338 if (asoc->strmout) { 339 for (i = newcnt; i < asoc->pre_open_streams; i++) { 340 outs = &asoc->strmout[i]; 341 TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) { 342 atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1); 343 TAILQ_REMOVE(&outs->outqueue, sp, next); 344 stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp, 1); 345 sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL, 346 stcb, 0, sp, SCTP_SO_NOT_LOCKED); 347 if (sp->data) { 348 sctp_m_freem(sp->data); 349 sp->data = NULL; 350 } 351 if (sp->net) { 352 sctp_free_remote_addr(sp->net); 353 sp->net = NULL; 354 } 355 /* Free the chunk */ 356 sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED); 357 /* sa_ignore FREED_MEMORY */ 358 } 359 outs->state = SCTP_STREAM_CLOSED; 360 } 361 } 362 /* cut back the count */ 363 asoc->pre_open_streams = newcnt; 364 } 365 SCTP_TCB_SEND_UNLOCK(stcb); 366 asoc->streamoutcnt = asoc->pre_open_streams; 367 if (asoc->strmout) { 368 for (i = 0; i < asoc->streamoutcnt; i++) { 369 asoc->strmout[i].state = SCTP_STREAM_OPEN; 370 } 371 } 372 /* EY - nr_sack: initialize highest tsn in nr_mapping_array */ 373 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 374 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 375 sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 376 } 377 /* This is the next one we expect */ 378 asoc->str_reset_seq_in = asoc->asconf_seq_in + 1; 379 380 asoc->mapping_array_base_tsn = ntohl(init->initial_tsn); 381 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in; 382 383 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 384 /* open the requested streams */ 385 386 if (asoc->strmin != NULL) { 387 /* Free the old ones */ 388 for (i = 0; i < asoc->streamincnt; i++) { 389 sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue); 390 sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue); 391 } 392 SCTP_FREE(asoc->strmin, SCTP_M_STRMI); 393 } 394 if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) { 395 asoc->streamincnt = ntohs(init->num_outbound_streams); 396 } else { 397 asoc->streamincnt = asoc->max_inbound_streams; 398 } 399 SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt * 400 sizeof(struct sctp_stream_in), SCTP_M_STRMI); 401 if (asoc->strmin == NULL) { 402 /* we didn't get memory for the streams! */ 403 SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n"); 404 return (-1); 405 } 406 for (i = 0; i < asoc->streamincnt; i++) { 407 asoc->strmin[i].sid = i; 408 asoc->strmin[i].last_mid_delivered = 0xffffffff; 409 TAILQ_INIT(&asoc->strmin[i].inqueue); 410 TAILQ_INIT(&asoc->strmin[i].uno_inqueue); 411 asoc->strmin[i].pd_api_started = 0; 412 asoc->strmin[i].delivery_started = 0; 413 } 414 /* 415 * load_address_from_init will put the addresses into the 416 * association when the COOKIE is processed or the INIT-ACK is 417 * processed. Both types of COOKIE's existing and new call this 418 * routine. It will remove addresses that are no longer in the 419 * association (for the restarting case where addresses are 420 * removed). Up front when the INIT arrives we will discard it if it 421 * is a restart and new addresses have been added. 422 */ 423 /* sa_ignore MEMLEAK */ 424 return (0); 425 } 426 427 /* 428 * INIT-ACK message processing/consumption returns value < 0 on error 429 */ 430 static int 431 sctp_process_init_ack(struct mbuf *m, int iphlen, int offset, 432 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 433 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 434 struct sctp_nets *net, int *abort_no_unlock, 435 uint8_t mflowtype, uint32_t mflowid, 436 uint32_t vrf_id) 437 { 438 struct sctp_association *asoc; 439 struct mbuf *op_err; 440 int retval, abort_flag, cookie_found; 441 int initack_limit; 442 int nat_friendly = 0; 443 444 /* First verify that we have no illegal param's */ 445 abort_flag = 0; 446 cookie_found = 0; 447 448 op_err = sctp_arethere_unrecognized_parameters(m, 449 (offset + sizeof(struct sctp_init_chunk)), 450 &abort_flag, (struct sctp_chunkhdr *)cp, 451 &nat_friendly, &cookie_found); 452 if (abort_flag) { 453 /* Send an abort and notify peer */ 454 sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED); 455 *abort_no_unlock = 1; 456 return (-1); 457 } 458 if (!cookie_found) { 459 uint16_t len; 460 461 /* Only report the missing cookie parameter */ 462 if (op_err != NULL) { 463 sctp_m_freem(op_err); 464 } 465 len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t)); 466 /* We abort with an error of missing mandatory param */ 467 op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA); 468 if (op_err != NULL) { 469 struct sctp_error_missing_param *cause; 470 471 SCTP_BUF_LEN(op_err) = len; 472 cause = mtod(op_err, struct sctp_error_missing_param *); 473 /* Subtract the reserved param */ 474 cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM); 475 cause->cause.length = htons(len); 476 cause->num_missing_params = htonl(1); 477 cause->type[0] = htons(SCTP_STATE_COOKIE); 478 } 479 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 480 src, dst, sh, op_err, 481 mflowtype, mflowid, 482 vrf_id, net->port); 483 *abort_no_unlock = 1; 484 return (-3); 485 } 486 asoc = &stcb->asoc; 487 asoc->peer_supports_nat = (uint8_t)nat_friendly; 488 /* process the peer's parameters in the INIT-ACK */ 489 retval = sctp_process_init((struct sctp_init_chunk *)cp, stcb); 490 if (retval < 0) { 491 if (op_err != NULL) { 492 sctp_m_freem(op_err); 493 } 494 return (retval); 495 } 496 initack_limit = offset + ntohs(cp->ch.chunk_length); 497 /* load all addresses */ 498 if ((retval = sctp_load_addresses_from_init(stcb, m, 499 (offset + sizeof(struct sctp_init_chunk)), initack_limit, 500 src, dst, NULL, stcb->asoc.port))) { 501 if (op_err != NULL) { 502 sctp_m_freem(op_err); 503 } 504 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 505 "Problem with address parameters"); 506 SCTPDBG(SCTP_DEBUG_INPUT1, 507 "Load addresses from INIT causes an abort %d\n", 508 retval); 509 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 510 src, dst, sh, op_err, 511 mflowtype, mflowid, 512 vrf_id, net->port); 513 *abort_no_unlock = 1; 514 return (-1); 515 } 516 /* if the peer doesn't support asconf, flush the asconf queue */ 517 if (asoc->asconf_supported == 0) { 518 struct sctp_asconf_addr *param, *nparam; 519 520 TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) { 521 TAILQ_REMOVE(&asoc->asconf_queue, param, next); 522 SCTP_FREE(param, SCTP_M_ASC_ADDR); 523 } 524 } 525 526 stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs, 527 stcb->asoc.local_hmacs); 528 if (op_err) { 529 sctp_queue_op_err(stcb, op_err); 530 /* queuing will steal away the mbuf chain to the out queue */ 531 op_err = NULL; 532 } 533 /* extract the cookie and queue it to "echo" it back... */ 534 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 535 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 536 stcb->asoc.overall_error_count, 537 0, 538 SCTP_FROM_SCTP_INPUT, 539 __LINE__); 540 } 541 stcb->asoc.overall_error_count = 0; 542 net->error_count = 0; 543 544 /* 545 * Cancel the INIT timer, We do this first before queueing the 546 * cookie. We always cancel at the primary to assue that we are 547 * canceling the timer started by the INIT which always goes to the 548 * primary. 549 */ 550 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb, 551 asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3); 552 553 /* calculate the RTO */ 554 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 555 SCTP_RTT_FROM_NON_DATA); 556 retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net); 557 return (retval); 558 } 559 560 static void 561 sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp, 562 struct sctp_tcb *stcb, struct sctp_nets *net) 563 { 564 union sctp_sockstore store; 565 struct sctp_nets *r_net, *f_net; 566 struct timeval tv; 567 int req_prim = 0; 568 uint16_t old_error_counter; 569 570 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) { 571 /* Invalid length */ 572 return; 573 } 574 575 memset(&store, 0, sizeof(store)); 576 switch (cp->heartbeat.hb_info.addr_family) { 577 #ifdef INET 578 case AF_INET: 579 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) { 580 store.sin.sin_family = cp->heartbeat.hb_info.addr_family; 581 store.sin.sin_len = cp->heartbeat.hb_info.addr_len; 582 store.sin.sin_port = stcb->rport; 583 memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address, 584 sizeof(store.sin.sin_addr)); 585 } else { 586 return; 587 } 588 break; 589 #endif 590 #ifdef INET6 591 case AF_INET6: 592 if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) { 593 store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family; 594 store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len; 595 store.sin6.sin6_port = stcb->rport; 596 memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr)); 597 } else { 598 return; 599 } 600 break; 601 #endif 602 default: 603 return; 604 } 605 r_net = sctp_findnet(stcb, &store.sa); 606 if (r_net == NULL) { 607 SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n"); 608 return; 609 } 610 if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) && 611 (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) && 612 (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) { 613 /* 614 * If the its a HB and it's random value is correct when can 615 * confirm the destination. 616 */ 617 r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 618 if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) { 619 stcb->asoc.primary_destination = r_net; 620 r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY; 621 f_net = TAILQ_FIRST(&stcb->asoc.nets); 622 if (f_net != r_net) { 623 /* 624 * first one on the list is NOT the primary 625 * sctp_cmpaddr() is much more efficient if 626 * the primary is the first on the list, 627 * make it so. 628 */ 629 TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next); 630 TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next); 631 } 632 req_prim = 1; 633 } 634 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 635 stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 636 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, 637 r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4); 638 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 639 } 640 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 641 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 642 stcb->asoc.overall_error_count, 643 0, 644 SCTP_FROM_SCTP_INPUT, 645 __LINE__); 646 } 647 stcb->asoc.overall_error_count = 0; 648 old_error_counter = r_net->error_count; 649 r_net->error_count = 0; 650 r_net->hb_responded = 1; 651 tv.tv_sec = cp->heartbeat.hb_info.time_value_1; 652 tv.tv_usec = cp->heartbeat.hb_info.time_value_2; 653 /* Now lets do a RTO with this */ 654 sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv, 655 SCTP_RTT_FROM_NON_DATA); 656 if (!(r_net->dest_state & SCTP_ADDR_REACHABLE)) { 657 r_net->dest_state |= SCTP_ADDR_REACHABLE; 658 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb, 659 0, (void *)r_net, SCTP_SO_NOT_LOCKED); 660 } 661 if (r_net->dest_state & SCTP_ADDR_PF) { 662 r_net->dest_state &= ~SCTP_ADDR_PF; 663 stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net); 664 } 665 if (old_error_counter > 0) { 666 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 667 stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5); 668 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net); 669 } 670 if (r_net == stcb->asoc.primary_destination) { 671 if (stcb->asoc.alternate) { 672 /* release the alternate, primary is good */ 673 sctp_free_remote_addr(stcb->asoc.alternate); 674 stcb->asoc.alternate = NULL; 675 } 676 } 677 /* Mobility adaptation */ 678 if (req_prim) { 679 if ((sctp_is_mobility_feature_on(stcb->sctp_ep, 680 SCTP_MOBILITY_BASE) || 681 sctp_is_mobility_feature_on(stcb->sctp_ep, 682 SCTP_MOBILITY_FASTHANDOFF)) && 683 sctp_is_mobility_feature_on(stcb->sctp_ep, 684 SCTP_MOBILITY_PRIM_DELETED)) { 685 sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED, 686 stcb->sctp_ep, stcb, NULL, 687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_6); 688 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 689 SCTP_MOBILITY_FASTHANDOFF)) { 690 sctp_assoc_immediate_retrans(stcb, 691 stcb->asoc.primary_destination); 692 } 693 if (sctp_is_mobility_feature_on(stcb->sctp_ep, 694 SCTP_MOBILITY_BASE)) { 695 sctp_move_chunks_from_net(stcb, 696 stcb->asoc.deleted_primary); 697 } 698 sctp_delete_prim_timer(stcb->sctp_ep, stcb); 699 } 700 } 701 } 702 703 static int 704 sctp_handle_nat_colliding_state(struct sctp_tcb *stcb) 705 { 706 /* 707 * Return 0 means we want you to proceed with the abort non-zero 708 * means no abort processing. 709 */ 710 uint32_t new_vtag; 711 struct sctpasochead *head; 712 713 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 714 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 715 new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1); 716 atomic_add_int(&stcb->asoc.refcnt, 1); 717 SCTP_TCB_UNLOCK(stcb); 718 SCTP_INP_INFO_WLOCK(); 719 SCTP_TCB_LOCK(stcb); 720 atomic_subtract_int(&stcb->asoc.refcnt, 1); 721 } else { 722 return (0); 723 } 724 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) { 725 /* generate a new vtag and send init */ 726 LIST_REMOVE(stcb, sctp_asocs); 727 stcb->asoc.my_vtag = new_vtag; 728 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 729 /* 730 * put it in the bucket in the vtag hash of assoc's for the 731 * system 732 */ 733 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 734 SCTP_INP_INFO_WUNLOCK(); 735 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 736 return (1); 737 } else { 738 /* 739 * treat like a case where the cookie expired i.e.: - dump 740 * current cookie. - generate a new vtag. - resend init. 741 */ 742 /* generate a new vtag and send init */ 743 LIST_REMOVE(stcb, sctp_asocs); 744 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 745 sctp_stop_all_cookie_timers(stcb); 746 sctp_toss_old_cookies(stcb, &stcb->asoc); 747 stcb->asoc.my_vtag = new_vtag; 748 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))]; 749 /* 750 * put it in the bucket in the vtag hash of assoc's for the 751 * system 752 */ 753 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 754 SCTP_INP_INFO_WUNLOCK(); 755 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 756 return (1); 757 } 758 return (0); 759 } 760 761 static int 762 sctp_handle_nat_missing_state(struct sctp_tcb *stcb, 763 struct sctp_nets *net) 764 { 765 /* 766 * return 0 means we want you to proceed with the abort non-zero 767 * means no abort processing 768 */ 769 if (stcb->asoc.auth_supported == 0) { 770 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n"); 771 return (0); 772 } 773 sctp_asconf_send_nat_state_update(stcb, net); 774 return (1); 775 } 776 777 /* Returns 1 if the stcb was aborted, 0 otherwise */ 778 static int 779 sctp_handle_abort(struct sctp_abort_chunk *abort, 780 struct sctp_tcb *stcb, struct sctp_nets *net) 781 { 782 uint16_t len; 783 uint16_t error; 784 785 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n"); 786 if (stcb == NULL) 787 return (0); 788 789 len = ntohs(abort->ch.chunk_length); 790 if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) { 791 /* 792 * Need to check the cause codes for our two magic nat 793 * aborts which don't kill the assoc necessarily. 794 */ 795 struct sctp_error_cause *cause; 796 797 cause = (struct sctp_error_cause *)(abort + 1); 798 error = ntohs(cause->code); 799 if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) { 800 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n", 801 abort->ch.chunk_flags); 802 if (sctp_handle_nat_colliding_state(stcb)) { 803 return (0); 804 } 805 } else if (error == SCTP_CAUSE_NAT_MISSING_STATE) { 806 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n", 807 abort->ch.chunk_flags); 808 if (sctp_handle_nat_missing_state(stcb, net)) { 809 return (0); 810 } 811 } 812 } else { 813 error = 0; 814 } 815 /* stop any receive timers */ 816 sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, 817 SCTP_FROM_SCTP_INPUT + SCTP_LOC_7); 818 /* notify user of the abort and clean up... */ 819 sctp_abort_notification(stcb, 1, error, abort, SCTP_SO_NOT_LOCKED); 820 /* free the tcb */ 821 SCTP_STAT_INCR_COUNTER32(sctps_aborted); 822 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 823 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 824 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 825 } 826 #ifdef SCTP_ASOCLOG_OF_TSNS 827 sctp_print_out_track_log(stcb); 828 #endif 829 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 830 SCTP_FROM_SCTP_INPUT + SCTP_LOC_8); 831 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n"); 832 return (1); 833 } 834 835 static void 836 sctp_start_net_timers(struct sctp_tcb *stcb) 837 { 838 uint32_t cnt_hb_sent; 839 struct sctp_nets *net; 840 841 cnt_hb_sent = 0; 842 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 843 /* 844 * For each network start: 1) A pmtu timer. 2) A HB timer 3) 845 * If the dest in unconfirmed send a hb as well if under 846 * max_hb_burst have been sent. 847 */ 848 sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net); 849 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net); 850 if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) && 851 (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) { 852 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 853 cnt_hb_sent++; 854 } 855 } 856 if (cnt_hb_sent) { 857 sctp_chunk_output(stcb->sctp_ep, stcb, 858 SCTP_OUTPUT_FROM_COOKIE_ACK, 859 SCTP_SO_NOT_LOCKED); 860 } 861 } 862 863 static void 864 sctp_handle_shutdown(struct sctp_shutdown_chunk *cp, 865 struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag) 866 { 867 struct sctp_association *asoc; 868 int some_on_streamwheel; 869 int old_state; 870 871 SCTPDBG(SCTP_DEBUG_INPUT2, 872 "sctp_handle_shutdown: handling SHUTDOWN\n"); 873 if (stcb == NULL) 874 return; 875 asoc = &stcb->asoc; 876 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 877 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 878 return; 879 } 880 if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) { 881 /* Shutdown NOT the expected size */ 882 return; 883 } 884 old_state = SCTP_GET_STATE(stcb); 885 sctp_update_acked(stcb, cp, abort_flag); 886 if (*abort_flag) { 887 return; 888 } 889 if (asoc->control_pdapi) { 890 /* 891 * With a normal shutdown we assume the end of last record. 892 */ 893 SCTP_INP_READ_LOCK(stcb->sctp_ep); 894 if (asoc->control_pdapi->on_strm_q) { 895 struct sctp_stream_in *strm; 896 897 strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream]; 898 if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) { 899 /* Unordered */ 900 TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm); 901 asoc->control_pdapi->on_strm_q = 0; 902 } else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) { 903 /* Ordered */ 904 TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm); 905 asoc->control_pdapi->on_strm_q = 0; 906 #ifdef INVARIANTS 907 } else { 908 panic("Unknown state on ctrl:%p on_strm_q:%d", 909 asoc->control_pdapi, 910 asoc->control_pdapi->on_strm_q); 911 #endif 912 } 913 } 914 asoc->control_pdapi->end_added = 1; 915 asoc->control_pdapi->pdapi_aborted = 1; 916 asoc->control_pdapi = NULL; 917 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 918 if (stcb->sctp_socket) { 919 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 920 } 921 } 922 /* goto SHUTDOWN_RECEIVED state to block new requests */ 923 if (stcb->sctp_socket) { 924 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 925 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) && 926 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 927 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED); 928 /* 929 * notify upper layer that peer has initiated a 930 * shutdown 931 */ 932 sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 933 934 /* reset time */ 935 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 936 } 937 } 938 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) { 939 /* 940 * stop the shutdown timer, since we WILL move to 941 * SHUTDOWN-ACK-SENT. 942 */ 943 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, 944 net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9); 945 } 946 /* Now is there unsent data on a stream somewhere? */ 947 some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED); 948 949 if (!TAILQ_EMPTY(&asoc->send_queue) || 950 !TAILQ_EMPTY(&asoc->sent_queue) || 951 some_on_streamwheel) { 952 /* By returning we will push more data out */ 953 return; 954 } else { 955 /* no outstanding data to send, so move on... */ 956 /* send SHUTDOWN-ACK */ 957 /* move to SHUTDOWN-ACK-SENT state */ 958 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) || 959 (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) { 960 SCTP_STAT_DECR_GAUGE32(sctps_currestab); 961 } 962 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 963 SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT); 964 sctp_stop_timers_for_shutdown(stcb); 965 sctp_send_shutdown_ack(stcb, net); 966 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, 967 stcb->sctp_ep, stcb, net); 968 } else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) { 969 sctp_send_shutdown_ack(stcb, net); 970 } 971 } 972 } 973 974 static void 975 sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED, 976 struct sctp_tcb *stcb, 977 struct sctp_nets *net) 978 { 979 struct sctp_association *asoc; 980 981 SCTPDBG(SCTP_DEBUG_INPUT2, 982 "sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n"); 983 if (stcb == NULL) 984 return; 985 986 asoc = &stcb->asoc; 987 /* process according to association state */ 988 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 989 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 990 /* unexpected SHUTDOWN-ACK... do OOTB handling... */ 991 sctp_send_shutdown_complete(stcb, net, 1); 992 SCTP_TCB_UNLOCK(stcb); 993 return; 994 } 995 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) && 996 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) { 997 /* unexpected SHUTDOWN-ACK... so ignore... */ 998 SCTP_TCB_UNLOCK(stcb); 999 return; 1000 } 1001 if (asoc->control_pdapi) { 1002 /* 1003 * With a normal shutdown we assume the end of last record. 1004 */ 1005 SCTP_INP_READ_LOCK(stcb->sctp_ep); 1006 asoc->control_pdapi->end_added = 1; 1007 asoc->control_pdapi->pdapi_aborted = 1; 1008 asoc->control_pdapi = NULL; 1009 SCTP_INP_READ_UNLOCK(stcb->sctp_ep); 1010 sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); 1011 } 1012 #ifdef INVARIANTS 1013 if (!TAILQ_EMPTY(&asoc->send_queue) || 1014 !TAILQ_EMPTY(&asoc->sent_queue) || 1015 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 1016 panic("Queues are not empty when handling SHUTDOWN-ACK"); 1017 } 1018 #endif 1019 /* stop the timer */ 1020 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net, 1021 SCTP_FROM_SCTP_INPUT + SCTP_LOC_10); 1022 /* send SHUTDOWN-COMPLETE */ 1023 sctp_send_shutdown_complete(stcb, net, 0); 1024 /* notify upper layer protocol */ 1025 if (stcb->sctp_socket) { 1026 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1027 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 1028 stcb->sctp_socket->so_snd.sb_cc = 0; 1029 } 1030 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 1031 } 1032 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 1033 /* free the TCB but first save off the ep */ 1034 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1035 SCTP_FROM_SCTP_INPUT + SCTP_LOC_11); 1036 } 1037 1038 static void 1039 sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type) 1040 { 1041 switch (chunk_type) { 1042 case SCTP_ASCONF_ACK: 1043 case SCTP_ASCONF: 1044 sctp_asconf_cleanup(stcb); 1045 break; 1046 case SCTP_IFORWARD_CUM_TSN: 1047 case SCTP_FORWARD_CUM_TSN: 1048 stcb->asoc.prsctp_supported = 0; 1049 break; 1050 default: 1051 SCTPDBG(SCTP_DEBUG_INPUT2, 1052 "Peer does not support chunk type %d (0x%x).\n", 1053 chunk_type, chunk_type); 1054 break; 1055 } 1056 } 1057 1058 /* 1059 * Skip past the param header and then we will find the param that caused the 1060 * problem. There are a number of param's in a ASCONF OR the prsctp param 1061 * these will turn of specific features. 1062 * XXX: Is this the right thing to do? 1063 */ 1064 static void 1065 sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type) 1066 { 1067 switch (parameter_type) { 1068 /* pr-sctp draft */ 1069 case SCTP_PRSCTP_SUPPORTED: 1070 stcb->asoc.prsctp_supported = 0; 1071 break; 1072 case SCTP_SUPPORTED_CHUNK_EXT: 1073 break; 1074 /* draft-ietf-tsvwg-addip-sctp */ 1075 case SCTP_HAS_NAT_SUPPORT: 1076 stcb->asoc.peer_supports_nat = 0; 1077 break; 1078 case SCTP_ADD_IP_ADDRESS: 1079 case SCTP_DEL_IP_ADDRESS: 1080 case SCTP_SET_PRIM_ADDR: 1081 stcb->asoc.asconf_supported = 0; 1082 break; 1083 case SCTP_SUCCESS_REPORT: 1084 case SCTP_ERROR_CAUSE_IND: 1085 SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n"); 1086 SCTPDBG(SCTP_DEBUG_INPUT2, 1087 "Turning off ASCONF to this strange peer\n"); 1088 stcb->asoc.asconf_supported = 0; 1089 break; 1090 default: 1091 SCTPDBG(SCTP_DEBUG_INPUT2, 1092 "Peer does not support param type %d (0x%x)??\n", 1093 parameter_type, parameter_type); 1094 break; 1095 } 1096 } 1097 1098 static int 1099 sctp_handle_error(struct sctp_chunkhdr *ch, 1100 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 1101 { 1102 struct sctp_error_cause *cause; 1103 struct sctp_association *asoc; 1104 uint32_t remaining_length, adjust; 1105 uint16_t code, cause_code, cause_length; 1106 1107 /* parse through all of the errors and process */ 1108 asoc = &stcb->asoc; 1109 cause = (struct sctp_error_cause *)((caddr_t)ch + 1110 sizeof(struct sctp_chunkhdr)); 1111 remaining_length = ntohs(ch->chunk_length); 1112 if (remaining_length > limit) { 1113 remaining_length = limit; 1114 } 1115 if (remaining_length >= sizeof(struct sctp_chunkhdr)) { 1116 remaining_length -= sizeof(struct sctp_chunkhdr); 1117 } else { 1118 remaining_length = 0; 1119 } 1120 code = 0; 1121 while (remaining_length >= sizeof(struct sctp_error_cause)) { 1122 /* Process an Error Cause */ 1123 cause_code = ntohs(cause->code); 1124 cause_length = ntohs(cause->length); 1125 if ((cause_length > remaining_length) || (cause_length == 0)) { 1126 /* Invalid cause length, possibly due to truncation. */ 1127 SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n", 1128 remaining_length, cause_length); 1129 return (0); 1130 } 1131 if (code == 0) { 1132 /* report the first error cause */ 1133 code = cause_code; 1134 } 1135 switch (cause_code) { 1136 case SCTP_CAUSE_INVALID_STREAM: 1137 case SCTP_CAUSE_MISSING_PARAM: 1138 case SCTP_CAUSE_INVALID_PARAM: 1139 case SCTP_CAUSE_NO_USER_DATA: 1140 SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n", 1141 cause_code); 1142 break; 1143 case SCTP_CAUSE_NAT_COLLIDING_STATE: 1144 SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n", 1145 ch->chunk_flags); 1146 if (sctp_handle_nat_colliding_state(stcb)) { 1147 return (0); 1148 } 1149 break; 1150 case SCTP_CAUSE_NAT_MISSING_STATE: 1151 SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n", 1152 ch->chunk_flags); 1153 if (sctp_handle_nat_missing_state(stcb, net)) { 1154 return (0); 1155 } 1156 break; 1157 case SCTP_CAUSE_STALE_COOKIE: 1158 /* 1159 * We only act if we have echoed a cookie and are 1160 * waiting. 1161 */ 1162 if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) && 1163 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1164 struct sctp_error_stale_cookie *stale_cookie; 1165 1166 stale_cookie = (struct sctp_error_stale_cookie *)cause; 1167 asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time); 1168 /* Double it to be more robust on RTX */ 1169 if (asoc->cookie_preserve_req <= UINT32_MAX / 2) { 1170 asoc->cookie_preserve_req *= 2; 1171 } else { 1172 asoc->cookie_preserve_req = UINT32_MAX; 1173 } 1174 asoc->stale_cookie_count++; 1175 if (asoc->stale_cookie_count > 1176 asoc->max_init_times) { 1177 sctp_abort_notification(stcb, 0, 0, NULL, SCTP_SO_NOT_LOCKED); 1178 /* now free the asoc */ 1179 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 1180 SCTP_FROM_SCTP_INPUT + SCTP_LOC_12); 1181 return (-1); 1182 } 1183 /* blast back to INIT state */ 1184 sctp_toss_old_cookies(stcb, &stcb->asoc); 1185 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT); 1186 sctp_stop_all_cookie_timers(stcb); 1187 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 1188 } 1189 break; 1190 case SCTP_CAUSE_UNRESOLVABLE_ADDR: 1191 /* 1192 * Nothing we can do here, we don't do hostname 1193 * addresses so if the peer does not like my IPv6 1194 * (or IPv4 for that matter) it does not matter. If 1195 * they don't support that type of address, they can 1196 * NOT possibly get that packet type... i.e. with no 1197 * IPv6 you can't receive a IPv6 packet. so we can 1198 * safely ignore this one. If we ever added support 1199 * for HOSTNAME Addresses, then we would need to do 1200 * something here. 1201 */ 1202 break; 1203 case SCTP_CAUSE_UNRECOG_CHUNK: 1204 if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) { 1205 struct sctp_error_unrecognized_chunk *unrec_chunk; 1206 1207 unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause; 1208 sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type); 1209 } 1210 break; 1211 case SCTP_CAUSE_UNRECOG_PARAM: 1212 /* XXX: We only consider the first parameter */ 1213 if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) { 1214 struct sctp_paramhdr *unrec_parameter; 1215 1216 unrec_parameter = (struct sctp_paramhdr *)(cause + 1); 1217 sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type)); 1218 } 1219 break; 1220 case SCTP_CAUSE_COOKIE_IN_SHUTDOWN: 1221 /* 1222 * We ignore this since the timer will drive out a 1223 * new cookie anyway and there timer will drive us 1224 * to send a SHUTDOWN_COMPLETE. We can't send one 1225 * here since we don't have their tag. 1226 */ 1227 break; 1228 case SCTP_CAUSE_DELETING_LAST_ADDR: 1229 case SCTP_CAUSE_RESOURCE_SHORTAGE: 1230 case SCTP_CAUSE_DELETING_SRC_ADDR: 1231 /* 1232 * We should NOT get these here, but in a 1233 * ASCONF-ACK. 1234 */ 1235 SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n", 1236 cause_code); 1237 break; 1238 case SCTP_CAUSE_OUT_OF_RESC: 1239 /* 1240 * And what, pray tell do we do with the fact that 1241 * the peer is out of resources? Not really sure we 1242 * could do anything but abort. I suspect this 1243 * should have came WITH an abort instead of in a 1244 * OP-ERROR. 1245 */ 1246 break; 1247 default: 1248 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n", 1249 cause_code); 1250 break; 1251 } 1252 adjust = SCTP_SIZE32(cause_length); 1253 if (remaining_length >= adjust) { 1254 remaining_length -= adjust; 1255 } else { 1256 remaining_length = 0; 1257 } 1258 cause = (struct sctp_error_cause *)((caddr_t)cause + adjust); 1259 } 1260 sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED); 1261 return (0); 1262 } 1263 1264 static int 1265 sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset, 1266 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh, 1267 struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb, 1268 struct sctp_nets *net, int *abort_no_unlock, 1269 uint8_t mflowtype, uint32_t mflowid, 1270 uint32_t vrf_id) 1271 { 1272 struct sctp_init_ack *init_ack; 1273 struct mbuf *op_err; 1274 1275 SCTPDBG(SCTP_DEBUG_INPUT2, 1276 "sctp_handle_init_ack: handling INIT-ACK\n"); 1277 1278 if (stcb == NULL) { 1279 SCTPDBG(SCTP_DEBUG_INPUT2, 1280 "sctp_handle_init_ack: TCB is null\n"); 1281 return (-1); 1282 } 1283 if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_init_ack_chunk)) { 1284 /* Invalid length */ 1285 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1286 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1287 src, dst, sh, op_err, 1288 mflowtype, mflowid, 1289 vrf_id, net->port); 1290 *abort_no_unlock = 1; 1291 return (-1); 1292 } 1293 init_ack = &cp->init; 1294 /* validate parameters */ 1295 if (init_ack->initiate_tag == 0) { 1296 /* protocol error... send an abort */ 1297 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1298 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1299 src, dst, sh, op_err, 1300 mflowtype, mflowid, 1301 vrf_id, net->port); 1302 *abort_no_unlock = 1; 1303 return (-1); 1304 } 1305 if (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) { 1306 /* protocol error... send an abort */ 1307 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1308 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1309 src, dst, sh, op_err, 1310 mflowtype, mflowid, 1311 vrf_id, net->port); 1312 *abort_no_unlock = 1; 1313 return (-1); 1314 } 1315 if (init_ack->num_inbound_streams == 0) { 1316 /* protocol error... send an abort */ 1317 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1318 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1319 src, dst, sh, op_err, 1320 mflowtype, mflowid, 1321 vrf_id, net->port); 1322 *abort_no_unlock = 1; 1323 return (-1); 1324 } 1325 if (init_ack->num_outbound_streams == 0) { 1326 /* protocol error... send an abort */ 1327 op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, ""); 1328 sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen, 1329 src, dst, sh, op_err, 1330 mflowtype, mflowid, 1331 vrf_id, net->port); 1332 *abort_no_unlock = 1; 1333 return (-1); 1334 } 1335 /* process according to association state... */ 1336 switch (SCTP_GET_STATE(stcb)) { 1337 case SCTP_STATE_COOKIE_WAIT: 1338 /* this is the expected state for this chunk */ 1339 /* process the INIT-ACK parameters */ 1340 if (stcb->asoc.primary_destination->dest_state & 1341 SCTP_ADDR_UNCONFIRMED) { 1342 /* 1343 * The primary is where we sent the INIT, we can 1344 * always consider it confirmed when the INIT-ACK is 1345 * returned. Do this before we load addresses 1346 * though. 1347 */ 1348 stcb->asoc.primary_destination->dest_state &= 1349 ~SCTP_ADDR_UNCONFIRMED; 1350 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 1351 stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED); 1352 } 1353 if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb, 1354 net, abort_no_unlock, 1355 mflowtype, mflowid, 1356 vrf_id) < 0) { 1357 /* error in parsing parameters */ 1358 return (-1); 1359 } 1360 /* update our state */ 1361 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n"); 1362 SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED); 1363 1364 /* reset the RTO calc */ 1365 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 1366 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 1367 stcb->asoc.overall_error_count, 1368 0, 1369 SCTP_FROM_SCTP_INPUT, 1370 __LINE__); 1371 } 1372 stcb->asoc.overall_error_count = 0; 1373 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 1374 /* 1375 * collapse the init timer back in case of a exponential 1376 * backoff 1377 */ 1378 sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep, 1379 stcb, net); 1380 /* 1381 * the send at the end of the inbound data processing will 1382 * cause the cookie to be sent 1383 */ 1384 break; 1385 case SCTP_STATE_SHUTDOWN_SENT: 1386 /* incorrect state... discard */ 1387 break; 1388 case SCTP_STATE_COOKIE_ECHOED: 1389 /* incorrect state... discard */ 1390 break; 1391 case SCTP_STATE_OPEN: 1392 /* incorrect state... discard */ 1393 break; 1394 case SCTP_STATE_EMPTY: 1395 case SCTP_STATE_INUSE: 1396 default: 1397 /* incorrect state... discard */ 1398 return (-1); 1399 break; 1400 } 1401 SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n"); 1402 return (0); 1403 } 1404 1405 static struct sctp_tcb * 1406 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1407 struct sockaddr *src, struct sockaddr *dst, 1408 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1409 struct sctp_inpcb *inp, struct sctp_nets **netp, 1410 struct sockaddr *init_src, int *notification, 1411 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1412 uint8_t mflowtype, uint32_t mflowid, 1413 uint32_t vrf_id, uint16_t port); 1414 1415 /* 1416 * handle a state cookie for an existing association m: input packet mbuf 1417 * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a 1418 * "split" mbuf and the cookie signature does not exist offset: offset into 1419 * mbuf to the cookie-echo chunk 1420 */ 1421 static struct sctp_tcb * 1422 sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset, 1423 struct sockaddr *src, struct sockaddr *dst, 1424 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1425 struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp, 1426 struct sockaddr *init_src, int *notification, 1427 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1428 uint8_t mflowtype, uint32_t mflowid, 1429 uint32_t vrf_id, uint16_t port) 1430 { 1431 struct sctp_association *asoc; 1432 struct sctp_init_chunk *init_cp, init_buf; 1433 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1434 struct sctp_nets *net; 1435 struct mbuf *op_err; 1436 struct timeval old; 1437 int init_offset, initack_offset, i; 1438 int retval; 1439 int spec_flag = 0; 1440 uint32_t how_indx; 1441 #if defined(SCTP_DETAILED_STR_STATS) 1442 int j; 1443 #endif 1444 1445 net = *netp; 1446 /* I know that the TCB is non-NULL from the caller */ 1447 asoc = &stcb->asoc; 1448 for (how_indx = 0; how_indx < sizeof(asoc->cookie_how); how_indx++) { 1449 if (asoc->cookie_how[how_indx] == 0) 1450 break; 1451 } 1452 if (how_indx < sizeof(asoc->cookie_how)) { 1453 asoc->cookie_how[how_indx] = 1; 1454 } 1455 if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) { 1456 /* SHUTDOWN came in after sending INIT-ACK */ 1457 sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); 1458 op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, ""); 1459 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 1460 mflowtype, mflowid, inp->fibnum, 1461 vrf_id, net->port); 1462 if (how_indx < sizeof(asoc->cookie_how)) 1463 asoc->cookie_how[how_indx] = 2; 1464 return (NULL); 1465 } 1466 /* 1467 * find and validate the INIT chunk in the cookie (peer's info) the 1468 * INIT should start after the cookie-echo header struct (chunk 1469 * header, state cookie header struct) 1470 */ 1471 init_offset = offset += sizeof(struct sctp_cookie_echo_chunk); 1472 1473 init_cp = (struct sctp_init_chunk *) 1474 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1475 (uint8_t *)&init_buf); 1476 if (init_cp == NULL) { 1477 /* could not pull a INIT chunk in cookie */ 1478 return (NULL); 1479 } 1480 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1481 return (NULL); 1482 } 1483 /* 1484 * find and validate the INIT-ACK chunk in the cookie (my info) the 1485 * INIT-ACK follows the INIT chunk 1486 */ 1487 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1488 initack_cp = (struct sctp_init_ack_chunk *) 1489 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1490 (uint8_t *)&initack_buf); 1491 if (initack_cp == NULL) { 1492 /* could not pull INIT-ACK chunk in cookie */ 1493 return (NULL); 1494 } 1495 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1496 return (NULL); 1497 } 1498 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1499 (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) { 1500 /* 1501 * case D in Section 5.2.4 Table 2: MMAA process accordingly 1502 * to get into the OPEN state 1503 */ 1504 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1505 /*- 1506 * Opps, this means that we somehow generated two vtag's 1507 * the same. I.e. we did: 1508 * Us Peer 1509 * <---INIT(tag=a)------ 1510 * ----INIT-ACK(tag=t)--> 1511 * ----INIT(tag=t)------> *1 1512 * <---INIT-ACK(tag=a)--- 1513 * <----CE(tag=t)------------- *2 1514 * 1515 * At point *1 we should be generating a different 1516 * tag t'. Which means we would throw away the CE and send 1517 * ours instead. Basically this is case C (throw away side). 1518 */ 1519 if (how_indx < sizeof(asoc->cookie_how)) 1520 asoc->cookie_how[how_indx] = 17; 1521 return (NULL); 1522 } 1523 switch (SCTP_GET_STATE(stcb)) { 1524 case SCTP_STATE_COOKIE_WAIT: 1525 case SCTP_STATE_COOKIE_ECHOED: 1526 /* 1527 * INIT was sent but got a COOKIE_ECHO with the 1528 * correct tags... just accept it...but we must 1529 * process the init so that we can make sure we have 1530 * the right seq no's. 1531 */ 1532 /* First we must process the INIT !! */ 1533 retval = sctp_process_init(init_cp, stcb); 1534 if (retval < 0) { 1535 if (how_indx < sizeof(asoc->cookie_how)) 1536 asoc->cookie_how[how_indx] = 3; 1537 return (NULL); 1538 } 1539 /* we have already processed the INIT so no problem */ 1540 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, 1541 stcb, net, 1542 SCTP_FROM_SCTP_INPUT + SCTP_LOC_13); 1543 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, 1544 stcb, net, 1545 SCTP_FROM_SCTP_INPUT + SCTP_LOC_14); 1546 /* update current state */ 1547 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1548 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1549 else 1550 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1551 1552 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1553 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1554 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1555 stcb->sctp_ep, stcb, NULL); 1556 } 1557 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1558 sctp_stop_all_cookie_timers(stcb); 1559 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1560 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1561 (!SCTP_IS_LISTENING(inp))) { 1562 /* 1563 * Here is where collision would go if we 1564 * did a connect() and instead got a 1565 * init/init-ack/cookie done before the 1566 * init-ack came back.. 1567 */ 1568 stcb->sctp_ep->sctp_flags |= 1569 SCTP_PCB_FLAGS_CONNECTED; 1570 soisconnected(stcb->sctp_socket); 1571 } 1572 /* notify upper layer */ 1573 *notification = SCTP_NOTIFY_ASSOC_UP; 1574 /* 1575 * since we did not send a HB make sure we don't 1576 * double things 1577 */ 1578 old.tv_sec = cookie->time_entered.tv_sec; 1579 old.tv_usec = cookie->time_entered.tv_usec; 1580 net->hb_responded = 1; 1581 sctp_calculate_rto(stcb, asoc, net, &old, 1582 SCTP_RTT_FROM_NON_DATA); 1583 1584 if (stcb->asoc.sctp_autoclose_ticks && 1585 (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) { 1586 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 1587 inp, stcb, NULL); 1588 } 1589 break; 1590 default: 1591 /* 1592 * we're in the OPEN state (or beyond), so peer must 1593 * have simply lost the COOKIE-ACK 1594 */ 1595 break; 1596 } /* end switch */ 1597 sctp_stop_all_cookie_timers(stcb); 1598 /* 1599 * We ignore the return code here.. not sure if we should 1600 * somehow abort.. but we do have an existing asoc. This 1601 * really should not fail. 1602 */ 1603 if (sctp_load_addresses_from_init(stcb, m, 1604 init_offset + sizeof(struct sctp_init_chunk), 1605 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1606 if (how_indx < sizeof(asoc->cookie_how)) 1607 asoc->cookie_how[how_indx] = 4; 1608 return (NULL); 1609 } 1610 /* respond with a COOKIE-ACK */ 1611 sctp_toss_old_cookies(stcb, asoc); 1612 sctp_send_cookie_ack(stcb); 1613 if (how_indx < sizeof(asoc->cookie_how)) 1614 asoc->cookie_how[how_indx] = 5; 1615 return (stcb); 1616 } 1617 1618 if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1619 ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag && 1620 cookie->tie_tag_my_vtag == 0 && 1621 cookie->tie_tag_peer_vtag == 0) { 1622 /* 1623 * case C in Section 5.2.4 Table 2: XMOO silently discard 1624 */ 1625 if (how_indx < sizeof(asoc->cookie_how)) 1626 asoc->cookie_how[how_indx] = 6; 1627 return (NULL); 1628 } 1629 /* 1630 * If nat support, and the below and stcb is established, send back 1631 * a ABORT(colliding state) if we are established. 1632 */ 1633 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) && 1634 (asoc->peer_supports_nat) && 1635 ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1636 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1637 (asoc->peer_vtag == 0)))) { 1638 /* 1639 * Special case - Peer's support nat. We may have two init's 1640 * that we gave out the same tag on since one was not 1641 * established.. i.e. we get INIT from host-1 behind the nat 1642 * and we respond tag-a, we get a INIT from host-2 behind 1643 * the nat and we get tag-a again. Then we bring up host-1 1644 * (or 2's) assoc, Then comes the cookie from hsot-2 (or 1). 1645 * Now we have colliding state. We must send an abort here 1646 * with colliding state indication. 1647 */ 1648 op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, ""); 1649 sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err, 1650 mflowtype, mflowid, inp->fibnum, 1651 vrf_id, port); 1652 return (NULL); 1653 } 1654 if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) && 1655 ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) || 1656 (asoc->peer_vtag == 0))) { 1657 /* 1658 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info 1659 * should be ok, re-accept peer info 1660 */ 1661 if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) { 1662 /* 1663 * Extension of case C. If we hit this, then the 1664 * random number generator returned the same vtag 1665 * when we first sent our INIT-ACK and when we later 1666 * sent our INIT. The side with the seq numbers that 1667 * are different will be the one that normnally 1668 * would have hit case C. This in effect "extends" 1669 * our vtags in this collision case to be 64 bits. 1670 * The same collision could occur aka you get both 1671 * vtag and seq number the same twice in a row.. but 1672 * is much less likely. If it did happen then we 1673 * would proceed through and bring up the assoc.. we 1674 * may end up with the wrong stream setup however.. 1675 * which would be bad.. but there is no way to 1676 * tell.. until we send on a stream that does not 1677 * exist :-) 1678 */ 1679 if (how_indx < sizeof(asoc->cookie_how)) 1680 asoc->cookie_how[how_indx] = 7; 1681 1682 return (NULL); 1683 } 1684 if (how_indx < sizeof(asoc->cookie_how)) 1685 asoc->cookie_how[how_indx] = 8; 1686 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1687 SCTP_FROM_SCTP_INPUT + SCTP_LOC_15); 1688 sctp_stop_all_cookie_timers(stcb); 1689 /* 1690 * since we did not send a HB make sure we don't double 1691 * things 1692 */ 1693 net->hb_responded = 1; 1694 if (stcb->asoc.sctp_autoclose_ticks && 1695 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 1696 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, 1697 NULL); 1698 } 1699 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1700 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1701 1702 if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) { 1703 /* 1704 * Ok the peer probably discarded our data (if we 1705 * echoed a cookie+data). So anything on the 1706 * sent_queue should be marked for retransmit, we 1707 * may not get something to kick us so it COULD 1708 * still take a timeout to move these.. but it can't 1709 * hurt to mark them. 1710 */ 1711 struct sctp_tmit_chunk *chk; 1712 1713 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 1714 if (chk->sent < SCTP_DATAGRAM_RESEND) { 1715 chk->sent = SCTP_DATAGRAM_RESEND; 1716 sctp_flight_size_decrease(chk); 1717 sctp_total_flight_decrease(stcb, chk); 1718 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 1719 spec_flag++; 1720 } 1721 } 1722 } 1723 /* process the INIT info (peer's info) */ 1724 retval = sctp_process_init(init_cp, stcb); 1725 if (retval < 0) { 1726 if (how_indx < sizeof(asoc->cookie_how)) 1727 asoc->cookie_how[how_indx] = 9; 1728 return (NULL); 1729 } 1730 if (sctp_load_addresses_from_init(stcb, m, 1731 init_offset + sizeof(struct sctp_init_chunk), 1732 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1733 if (how_indx < sizeof(asoc->cookie_how)) 1734 asoc->cookie_how[how_indx] = 10; 1735 return (NULL); 1736 } 1737 if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) || 1738 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 1739 *notification = SCTP_NOTIFY_ASSOC_UP; 1740 1741 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 1742 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 1743 (!SCTP_IS_LISTENING(inp))) { 1744 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 1745 soisconnected(stcb->sctp_socket); 1746 } 1747 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) 1748 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 1749 else 1750 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1751 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1752 } else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1753 SCTP_STAT_INCR_COUNTER32(sctps_restartestab); 1754 } else { 1755 SCTP_STAT_INCR_COUNTER32(sctps_collisionestab); 1756 } 1757 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1758 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1759 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1760 stcb->sctp_ep, stcb, NULL); 1761 } 1762 sctp_stop_all_cookie_timers(stcb); 1763 sctp_toss_old_cookies(stcb, asoc); 1764 sctp_send_cookie_ack(stcb); 1765 if (spec_flag) { 1766 /* 1767 * only if we have retrans set do we do this. What 1768 * this call does is get only the COOKIE-ACK out and 1769 * then when we return the normal call to 1770 * sctp_chunk_output will get the retrans out behind 1771 * this. 1772 */ 1773 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED); 1774 } 1775 if (how_indx < sizeof(asoc->cookie_how)) 1776 asoc->cookie_how[how_indx] = 11; 1777 1778 return (stcb); 1779 } 1780 if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag && 1781 ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) && 1782 cookie->tie_tag_my_vtag == asoc->my_vtag_nonce && 1783 cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce && 1784 cookie->tie_tag_peer_vtag != 0) { 1785 struct sctpasochead *head; 1786 1787 if (asoc->peer_supports_nat) { 1788 /* 1789 * This is a gross gross hack. Just call the 1790 * cookie_new code since we are allowing a duplicate 1791 * association. I hope this works... 1792 */ 1793 return (sctp_process_cookie_new(m, iphlen, offset, src, dst, 1794 sh, cookie, cookie_len, 1795 inp, netp, init_src, notification, 1796 auth_skipped, auth_offset, auth_len, 1797 mflowtype, mflowid, 1798 vrf_id, port)); 1799 } 1800 /* 1801 * case A in Section 5.2.4 Table 2: XXMM (peer restarted) 1802 */ 1803 /* temp code */ 1804 if (how_indx < sizeof(asoc->cookie_how)) 1805 asoc->cookie_how[how_indx] = 12; 1806 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp, stcb, net, 1807 SCTP_FROM_SCTP_INPUT + SCTP_LOC_16); 1808 sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net, 1809 SCTP_FROM_SCTP_INPUT + SCTP_LOC_17); 1810 1811 /* notify upper layer */ 1812 *notification = SCTP_NOTIFY_ASSOC_RESTART; 1813 atomic_add_int(&stcb->asoc.refcnt, 1); 1814 if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) && 1815 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) && 1816 (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) { 1817 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 1818 } 1819 if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) { 1820 SCTP_STAT_INCR_GAUGE32(sctps_restartestab); 1821 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1822 SCTP_STAT_INCR_GAUGE32(sctps_collisionestab); 1823 } 1824 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 1825 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1826 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 1827 stcb->sctp_ep, stcb, NULL); 1828 1829 } else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) { 1830 /* move to OPEN state, if not in SHUTDOWN_SENT */ 1831 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 1832 } 1833 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 1834 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 1835 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 1836 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 1837 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 1838 asoc->str_reset_seq_in = asoc->init_seq_number; 1839 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 1840 asoc->send_sack = 1; 1841 if (asoc->mapping_array) { 1842 memset(asoc->mapping_array, 0, 1843 asoc->mapping_array_size); 1844 } 1845 if (asoc->nr_mapping_array) { 1846 memset(asoc->nr_mapping_array, 0, 1847 asoc->mapping_array_size); 1848 } 1849 SCTP_TCB_UNLOCK(stcb); 1850 SCTP_INP_INFO_WLOCK(); 1851 SCTP_INP_WLOCK(stcb->sctp_ep); 1852 SCTP_TCB_LOCK(stcb); 1853 atomic_add_int(&stcb->asoc.refcnt, -1); 1854 /* send up all the data */ 1855 SCTP_TCB_SEND_LOCK(stcb); 1856 1857 sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED); 1858 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 1859 stcb->asoc.strmout[i].chunks_on_queues = 0; 1860 #if defined(SCTP_DETAILED_STR_STATS) 1861 for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) { 1862 asoc->strmout[i].abandoned_sent[j] = 0; 1863 asoc->strmout[i].abandoned_unsent[j] = 0; 1864 } 1865 #else 1866 asoc->strmout[i].abandoned_sent[0] = 0; 1867 asoc->strmout[i].abandoned_unsent[0] = 0; 1868 #endif 1869 stcb->asoc.strmout[i].sid = i; 1870 stcb->asoc.strmout[i].next_mid_ordered = 0; 1871 stcb->asoc.strmout[i].next_mid_unordered = 0; 1872 stcb->asoc.strmout[i].last_msg_incomplete = 0; 1873 } 1874 /* process the INIT-ACK info (my info) */ 1875 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 1876 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 1877 1878 /* pull from vtag hash */ 1879 LIST_REMOVE(stcb, sctp_asocs); 1880 /* re-insert to new vtag position */ 1881 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, 1882 SCTP_BASE_INFO(hashasocmark))]; 1883 /* 1884 * put it in the bucket in the vtag hash of assoc's for the 1885 * system 1886 */ 1887 LIST_INSERT_HEAD(head, stcb, sctp_asocs); 1888 1889 SCTP_TCB_SEND_UNLOCK(stcb); 1890 SCTP_INP_WUNLOCK(stcb->sctp_ep); 1891 SCTP_INP_INFO_WUNLOCK(); 1892 asoc->total_flight = 0; 1893 asoc->total_flight_count = 0; 1894 /* process the INIT info (peer's info) */ 1895 retval = sctp_process_init(init_cp, stcb); 1896 if (retval < 0) { 1897 if (how_indx < sizeof(asoc->cookie_how)) 1898 asoc->cookie_how[how_indx] = 13; 1899 1900 return (NULL); 1901 } 1902 /* 1903 * since we did not send a HB make sure we don't double 1904 * things 1905 */ 1906 net->hb_responded = 1; 1907 1908 if (sctp_load_addresses_from_init(stcb, m, 1909 init_offset + sizeof(struct sctp_init_chunk), 1910 initack_offset, src, dst, init_src, stcb->asoc.port)) { 1911 if (how_indx < sizeof(asoc->cookie_how)) 1912 asoc->cookie_how[how_indx] = 14; 1913 1914 return (NULL); 1915 } 1916 /* respond with a COOKIE-ACK */ 1917 sctp_stop_all_cookie_timers(stcb); 1918 sctp_toss_old_cookies(stcb, asoc); 1919 sctp_send_cookie_ack(stcb); 1920 if (how_indx < sizeof(asoc->cookie_how)) 1921 asoc->cookie_how[how_indx] = 15; 1922 1923 return (stcb); 1924 } 1925 if (how_indx < sizeof(asoc->cookie_how)) 1926 asoc->cookie_how[how_indx] = 16; 1927 /* all other cases... */ 1928 return (NULL); 1929 } 1930 1931 /* 1932 * handle a state cookie for a new association m: input packet mbuf chain-- 1933 * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf 1934 * and the cookie signature does not exist offset: offset into mbuf to the 1935 * cookie-echo chunk length: length of the cookie chunk to: where the init 1936 * was from returns a new TCB 1937 */ 1938 static struct sctp_tcb * 1939 sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset, 1940 struct sockaddr *src, struct sockaddr *dst, 1941 struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len, 1942 struct sctp_inpcb *inp, struct sctp_nets **netp, 1943 struct sockaddr *init_src, int *notification, 1944 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 1945 uint8_t mflowtype, uint32_t mflowid, 1946 uint32_t vrf_id, uint16_t port) 1947 { 1948 struct sctp_tcb *stcb; 1949 struct sctp_init_chunk *init_cp, init_buf; 1950 struct sctp_init_ack_chunk *initack_cp, initack_buf; 1951 union sctp_sockstore store; 1952 struct sctp_association *asoc; 1953 int init_offset, initack_offset, initack_limit; 1954 int retval; 1955 int error = 0; 1956 uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 1957 1958 /* 1959 * find and validate the INIT chunk in the cookie (peer's info) the 1960 * INIT should start after the cookie-echo header struct (chunk 1961 * header, state cookie header struct) 1962 */ 1963 init_offset = offset + sizeof(struct sctp_cookie_echo_chunk); 1964 init_cp = (struct sctp_init_chunk *) 1965 sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk), 1966 (uint8_t *)&init_buf); 1967 if (init_cp == NULL) { 1968 /* could not pull a INIT chunk in cookie */ 1969 SCTPDBG(SCTP_DEBUG_INPUT1, 1970 "process_cookie_new: could not pull INIT chunk hdr\n"); 1971 return (NULL); 1972 } 1973 if (init_cp->ch.chunk_type != SCTP_INITIATION) { 1974 SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n"); 1975 return (NULL); 1976 } 1977 initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length)); 1978 /* 1979 * find and validate the INIT-ACK chunk in the cookie (my info) the 1980 * INIT-ACK follows the INIT chunk 1981 */ 1982 initack_cp = (struct sctp_init_ack_chunk *) 1983 sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk), 1984 (uint8_t *)&initack_buf); 1985 if (initack_cp == NULL) { 1986 /* could not pull INIT-ACK chunk in cookie */ 1987 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n"); 1988 return (NULL); 1989 } 1990 if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) { 1991 return (NULL); 1992 } 1993 /* 1994 * NOTE: We can't use the INIT_ACK's chk_length to determine the 1995 * "initack_limit" value. This is because the chk_length field 1996 * includes the length of the cookie, but the cookie is omitted when 1997 * the INIT and INIT_ACK are tacked onto the cookie... 1998 */ 1999 initack_limit = offset + cookie_len; 2000 2001 /* 2002 * now that we know the INIT/INIT-ACK are in place, create a new TCB 2003 * and popluate 2004 */ 2005 2006 /* 2007 * Here we do a trick, we set in NULL for the proc/thread argument. 2008 * We do this since in effect we only use the p argument when the 2009 * socket is unbound and we must do an implicit bind. Since we are 2010 * getting a cookie, we cannot be unbound. 2011 */ 2012 stcb = sctp_aloc_assoc(inp, init_src, &error, 2013 ntohl(initack_cp->init.initiate_tag), vrf_id, 2014 ntohs(initack_cp->init.num_outbound_streams), 2015 port, 2016 (struct thread *)NULL, 2017 SCTP_DONT_INITIALIZE_AUTH_PARAMS); 2018 if (stcb == NULL) { 2019 struct mbuf *op_err; 2020 2021 /* memory problem? */ 2022 SCTPDBG(SCTP_DEBUG_INPUT1, 2023 "process_cookie_new: no room for another TCB!\n"); 2024 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2025 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2026 src, dst, sh, op_err, 2027 mflowtype, mflowid, 2028 vrf_id, port); 2029 return (NULL); 2030 } 2031 asoc = &stcb->asoc; 2032 /* get scope variables out of cookie */ 2033 asoc->scope.ipv4_local_scope = cookie->ipv4_scope; 2034 asoc->scope.site_scope = cookie->site_scope; 2035 asoc->scope.local_scope = cookie->local_scope; 2036 asoc->scope.loopback_scope = cookie->loopback_scope; 2037 2038 if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) || 2039 (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) { 2040 struct mbuf *op_err; 2041 2042 /* 2043 * Houston we have a problem. The EP changed while the 2044 * cookie was in flight. Only recourse is to abort the 2045 * association. 2046 */ 2047 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2048 sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen, 2049 src, dst, sh, op_err, 2050 mflowtype, mflowid, 2051 vrf_id, port); 2052 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2053 SCTP_FROM_SCTP_INPUT + SCTP_LOC_18); 2054 return (NULL); 2055 } 2056 /* process the INIT-ACK info (my info) */ 2057 asoc->my_vtag = ntohl(initack_cp->init.initiate_tag); 2058 asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd); 2059 asoc->pre_open_streams = ntohs(initack_cp->init.num_outbound_streams); 2060 asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn); 2061 asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number; 2062 asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1; 2063 asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1; 2064 asoc->str_reset_seq_in = asoc->init_seq_number; 2065 2066 asoc->advanced_peer_ack_point = asoc->last_acked_seq; 2067 2068 /* process the INIT info (peer's info) */ 2069 retval = sctp_process_init(init_cp, stcb); 2070 if (retval < 0) { 2071 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2072 SCTP_FROM_SCTP_INPUT + SCTP_LOC_19); 2073 return (NULL); 2074 } 2075 /* load all addresses */ 2076 if (sctp_load_addresses_from_init(stcb, m, 2077 init_offset + sizeof(struct sctp_init_chunk), initack_offset, 2078 src, dst, init_src, port)) { 2079 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2080 SCTP_FROM_SCTP_INPUT + SCTP_LOC_20); 2081 return (NULL); 2082 } 2083 /* 2084 * verify any preceding AUTH chunk that was skipped 2085 */ 2086 /* pull the local authentication parameters from the cookie/init-ack */ 2087 sctp_auth_get_cookie_params(stcb, m, 2088 initack_offset + sizeof(struct sctp_init_ack_chunk), 2089 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk))); 2090 if (auth_skipped) { 2091 struct sctp_auth_chunk *auth; 2092 2093 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 2094 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf); 2095 } else { 2096 auth = NULL; 2097 } 2098 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) { 2099 /* auth HMAC failed, dump the assoc and packet */ 2100 SCTPDBG(SCTP_DEBUG_AUTH1, 2101 "COOKIE-ECHO: AUTH failed\n"); 2102 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2103 SCTP_FROM_SCTP_INPUT + SCTP_LOC_21); 2104 return (NULL); 2105 } else { 2106 /* remaining chunks checked... good to go */ 2107 stcb->asoc.authenticated = 1; 2108 } 2109 } 2110 2111 /* 2112 * if we're doing ASCONFs, check to see if we have any new local 2113 * addresses that need to get added to the peer (eg. addresses 2114 * changed while cookie echo in flight). This needs to be done 2115 * after we go to the OPEN state to do the correct asconf 2116 * processing. else, make sure we have the correct addresses in our 2117 * lists 2118 */ 2119 2120 /* warning, we re-use sin, sin6, sa_store here! */ 2121 /* pull in local_address (our "from" address) */ 2122 switch (cookie->laddr_type) { 2123 #ifdef INET 2124 case SCTP_IPV4_ADDRESS: 2125 /* source addr is IPv4 */ 2126 memset(&store.sin, 0, sizeof(struct sockaddr_in)); 2127 store.sin.sin_family = AF_INET; 2128 store.sin.sin_len = sizeof(struct sockaddr_in); 2129 store.sin.sin_addr.s_addr = cookie->laddress[0]; 2130 break; 2131 #endif 2132 #ifdef INET6 2133 case SCTP_IPV6_ADDRESS: 2134 /* source addr is IPv6 */ 2135 memset(&store.sin6, 0, sizeof(struct sockaddr_in6)); 2136 store.sin6.sin6_family = AF_INET6; 2137 store.sin6.sin6_len = sizeof(struct sockaddr_in6); 2138 store.sin6.sin6_scope_id = cookie->scope_id; 2139 memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr)); 2140 break; 2141 #endif 2142 default: 2143 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 2144 SCTP_FROM_SCTP_INPUT + SCTP_LOC_22); 2145 return (NULL); 2146 } 2147 2148 /* update current state */ 2149 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2150 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2151 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2152 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2153 stcb->sctp_ep, stcb, NULL); 2154 } 2155 sctp_stop_all_cookie_timers(stcb); 2156 SCTP_STAT_INCR_COUNTER32(sctps_passiveestab); 2157 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2158 2159 /* set up to notify upper layer */ 2160 *notification = SCTP_NOTIFY_ASSOC_UP; 2161 if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2162 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) && 2163 (!SCTP_IS_LISTENING(inp))) { 2164 /* 2165 * This is an endpoint that called connect() how it got a 2166 * cookie that is NEW is a bit of a mystery. It must be that 2167 * the INIT was sent, but before it got there.. a complete 2168 * INIT/INIT-ACK/COOKIE arrived. But of course then it 2169 * should have went to the other code.. not here.. oh well.. 2170 * a bit of protection is worth having.. 2171 */ 2172 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2173 soisconnected(stcb->sctp_socket); 2174 } else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 2175 (SCTP_IS_LISTENING(inp))) { 2176 /* 2177 * We don't want to do anything with this one. Since it is 2178 * the listening guy. The timer will get started for 2179 * accepted connections in the caller. 2180 */ 2181 ; 2182 } 2183 if (stcb->asoc.sctp_autoclose_ticks && 2184 sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2185 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL); 2186 } 2187 (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered); 2188 *netp = sctp_findnet(stcb, init_src); 2189 if (*netp != NULL) { 2190 struct timeval old; 2191 2192 /* 2193 * Since we did not send a HB, make sure we don't double 2194 * things. 2195 */ 2196 (*netp)->hb_responded = 1; 2197 /* Calculate the RTT. */ 2198 old.tv_sec = cookie->time_entered.tv_sec; 2199 old.tv_usec = cookie->time_entered.tv_usec; 2200 sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA); 2201 } 2202 /* respond with a COOKIE-ACK */ 2203 sctp_send_cookie_ack(stcb); 2204 2205 /* 2206 * check the address lists for any ASCONFs that need to be sent 2207 * AFTER the cookie-ack is sent 2208 */ 2209 sctp_check_address_list(stcb, m, 2210 initack_offset + sizeof(struct sctp_init_ack_chunk), 2211 initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)), 2212 &store.sa, cookie->local_scope, cookie->site_scope, 2213 cookie->ipv4_scope, cookie->loopback_scope); 2214 2215 return (stcb); 2216 } 2217 2218 /* 2219 * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e 2220 * we NEED to make sure we are not already using the vtag. If so we 2221 * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit! 2222 head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag, 2223 SCTP_BASE_INFO(hashasocmark))]; 2224 LIST_FOREACH(stcb, head, sctp_asocs) { 2225 if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) { 2226 -- SEND ABORT - TRY AGAIN -- 2227 } 2228 } 2229 */ 2230 2231 /* 2232 * handles a COOKIE-ECHO message stcb: modified to either a new or left as 2233 * existing (non-NULL) TCB 2234 */ 2235 static struct mbuf * 2236 sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset, 2237 struct sockaddr *src, struct sockaddr *dst, 2238 struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp, 2239 struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp, 2240 int auth_skipped, uint32_t auth_offset, uint32_t auth_len, 2241 struct sctp_tcb **locked_tcb, 2242 uint8_t mflowtype, uint32_t mflowid, 2243 uint32_t vrf_id, uint16_t port) 2244 { 2245 struct sctp_state_cookie *cookie; 2246 struct sctp_tcb *l_stcb = *stcb; 2247 struct sctp_inpcb *l_inp; 2248 struct sockaddr *to; 2249 struct sctp_pcb *ep; 2250 struct mbuf *m_sig; 2251 uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE]; 2252 uint8_t *sig; 2253 uint8_t cookie_ok = 0; 2254 unsigned int sig_offset, cookie_offset; 2255 unsigned int cookie_len; 2256 struct timeval now; 2257 struct timeval time_expires; 2258 int notification = 0; 2259 struct sctp_nets *netl; 2260 int had_a_existing_tcb = 0; 2261 int send_int_conf = 0; 2262 #ifdef INET 2263 struct sockaddr_in sin; 2264 #endif 2265 #ifdef INET6 2266 struct sockaddr_in6 sin6; 2267 #endif 2268 2269 SCTPDBG(SCTP_DEBUG_INPUT2, 2270 "sctp_handle_cookie: handling COOKIE-ECHO\n"); 2271 2272 if (inp_p == NULL) { 2273 return (NULL); 2274 } 2275 cookie = &cp->cookie; 2276 cookie_offset = offset + sizeof(struct sctp_chunkhdr); 2277 cookie_len = ntohs(cp->ch.chunk_length); 2278 2279 if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) + 2280 sizeof(struct sctp_init_chunk) + 2281 sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) { 2282 /* cookie too small */ 2283 return (NULL); 2284 } 2285 if ((cookie->peerport != sh->src_port) || 2286 (cookie->myport != sh->dest_port) || 2287 (cookie->my_vtag != sh->v_tag)) { 2288 /* 2289 * invalid ports or bad tag. Note that we always leave the 2290 * v_tag in the header in network order and when we stored 2291 * it in the my_vtag slot we also left it in network order. 2292 * This maintains the match even though it may be in the 2293 * opposite byte order of the machine :-> 2294 */ 2295 return (NULL); 2296 } 2297 /* 2298 * split off the signature into its own mbuf (since it should not be 2299 * calculated in the sctp_hmac_m() call). 2300 */ 2301 sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE; 2302 m_sig = m_split(m, sig_offset, M_NOWAIT); 2303 if (m_sig == NULL) { 2304 /* out of memory or ?? */ 2305 return (NULL); 2306 } 2307 #ifdef SCTP_MBUF_LOGGING 2308 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 2309 sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT); 2310 } 2311 #endif 2312 2313 /* 2314 * compute the signature/digest for the cookie 2315 */ 2316 ep = &(*inp_p)->sctp_ep; 2317 l_inp = *inp_p; 2318 if (l_stcb) { 2319 SCTP_TCB_UNLOCK(l_stcb); 2320 } 2321 SCTP_INP_RLOCK(l_inp); 2322 if (l_stcb) { 2323 SCTP_TCB_LOCK(l_stcb); 2324 } 2325 /* which cookie is it? */ 2326 if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) && 2327 (ep->current_secret_number != ep->last_secret_number)) { 2328 /* it's the old cookie */ 2329 (void)sctp_hmac_m(SCTP_HMAC, 2330 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2331 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2332 } else { 2333 /* it's the current cookie */ 2334 (void)sctp_hmac_m(SCTP_HMAC, 2335 (uint8_t *)ep->secret_key[(int)ep->current_secret_number], 2336 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2337 } 2338 /* get the signature */ 2339 SCTP_INP_RUNLOCK(l_inp); 2340 sig = (uint8_t *)sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *)&tmp_sig); 2341 if (sig == NULL) { 2342 /* couldn't find signature */ 2343 sctp_m_freem(m_sig); 2344 return (NULL); 2345 } 2346 /* compare the received digest with the computed digest */ 2347 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) { 2348 /* try the old cookie? */ 2349 if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) && 2350 (ep->current_secret_number != ep->last_secret_number)) { 2351 /* compute digest with old */ 2352 (void)sctp_hmac_m(SCTP_HMAC, 2353 (uint8_t *)ep->secret_key[(int)ep->last_secret_number], 2354 SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0); 2355 /* compare */ 2356 if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0) 2357 cookie_ok = 1; 2358 } 2359 } else { 2360 cookie_ok = 1; 2361 } 2362 2363 /* 2364 * Now before we continue we must reconstruct our mbuf so that 2365 * normal processing of any other chunks will work. 2366 */ 2367 { 2368 struct mbuf *m_at; 2369 2370 m_at = m; 2371 while (SCTP_BUF_NEXT(m_at) != NULL) { 2372 m_at = SCTP_BUF_NEXT(m_at); 2373 } 2374 SCTP_BUF_NEXT(m_at) = m_sig; 2375 } 2376 2377 if (cookie_ok == 0) { 2378 SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n"); 2379 SCTPDBG(SCTP_DEBUG_INPUT2, 2380 "offset = %u, cookie_offset = %u, sig_offset = %u\n", 2381 (uint32_t)offset, cookie_offset, sig_offset); 2382 return (NULL); 2383 } 2384 2385 /* 2386 * check the cookie timestamps to be sure it's not stale 2387 */ 2388 (void)SCTP_GETTIME_TIMEVAL(&now); 2389 /* Expire time is in Ticks, so we convert to seconds */ 2390 time_expires.tv_sec = cookie->time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life); 2391 time_expires.tv_usec = cookie->time_entered.tv_usec; 2392 if (timevalcmp(&now, &time_expires, >)) { 2393 /* cookie is stale! */ 2394 struct mbuf *op_err; 2395 struct sctp_error_stale_cookie *cause; 2396 struct timeval diff; 2397 uint32_t staleness; 2398 2399 op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie), 2400 0, M_NOWAIT, 1, MT_DATA); 2401 if (op_err == NULL) { 2402 /* FOOBAR */ 2403 return (NULL); 2404 } 2405 /* Set the len */ 2406 SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie); 2407 cause = mtod(op_err, struct sctp_error_stale_cookie *); 2408 cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE); 2409 cause->cause.length = htons((sizeof(struct sctp_paramhdr) + 2410 (sizeof(uint32_t)))); 2411 diff = now; 2412 timevalsub(&diff, &time_expires); 2413 if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) { 2414 staleness = UINT32_MAX; 2415 } else { 2416 staleness = diff.tv_sec * 1000000; 2417 } 2418 if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) { 2419 staleness += diff.tv_usec; 2420 } else { 2421 staleness = UINT32_MAX; 2422 } 2423 cause->stale_time = htonl(staleness); 2424 sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err, 2425 mflowtype, mflowid, l_inp->fibnum, 2426 vrf_id, port); 2427 return (NULL); 2428 } 2429 /* 2430 * Now we must see with the lookup address if we have an existing 2431 * asoc. This will only happen if we were in the COOKIE-WAIT state 2432 * and a INIT collided with us and somewhere the peer sent the 2433 * cookie on another address besides the single address our assoc 2434 * had for him. In this case we will have one of the tie-tags set at 2435 * least AND the address field in the cookie can be used to look it 2436 * up. 2437 */ 2438 to = NULL; 2439 switch (cookie->addr_type) { 2440 #ifdef INET6 2441 case SCTP_IPV6_ADDRESS: 2442 memset(&sin6, 0, sizeof(sin6)); 2443 sin6.sin6_family = AF_INET6; 2444 sin6.sin6_len = sizeof(sin6); 2445 sin6.sin6_port = sh->src_port; 2446 sin6.sin6_scope_id = cookie->scope_id; 2447 memcpy(&sin6.sin6_addr.s6_addr, cookie->address, 2448 sizeof(sin6.sin6_addr.s6_addr)); 2449 to = (struct sockaddr *)&sin6; 2450 break; 2451 #endif 2452 #ifdef INET 2453 case SCTP_IPV4_ADDRESS: 2454 memset(&sin, 0, sizeof(sin)); 2455 sin.sin_family = AF_INET; 2456 sin.sin_len = sizeof(sin); 2457 sin.sin_port = sh->src_port; 2458 sin.sin_addr.s_addr = cookie->address[0]; 2459 to = (struct sockaddr *)&sin; 2460 break; 2461 #endif 2462 default: 2463 /* This should not happen */ 2464 return (NULL); 2465 } 2466 if (*stcb == NULL) { 2467 /* Yep, lets check */ 2468 *stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL); 2469 if (*stcb == NULL) { 2470 /* 2471 * We should have only got back the same inp. If we 2472 * got back a different ep we have a problem. The 2473 * original findep got back l_inp and now 2474 */ 2475 if (l_inp != *inp_p) { 2476 SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n"); 2477 } 2478 } else { 2479 if (*locked_tcb == NULL) { 2480 /* 2481 * In this case we found the assoc only 2482 * after we locked the create lock. This 2483 * means we are in a colliding case and we 2484 * must make sure that we unlock the tcb if 2485 * its one of the cases where we throw away 2486 * the incoming packets. 2487 */ 2488 *locked_tcb = *stcb; 2489 2490 /* 2491 * We must also increment the inp ref count 2492 * since the ref_count flags was set when we 2493 * did not find the TCB, now we found it 2494 * which reduces the refcount.. we must 2495 * raise it back out to balance it all :-) 2496 */ 2497 SCTP_INP_INCR_REF((*stcb)->sctp_ep); 2498 if ((*stcb)->sctp_ep != l_inp) { 2499 SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n", 2500 (void *)(*stcb)->sctp_ep, (void *)l_inp); 2501 } 2502 } 2503 } 2504 } 2505 2506 cookie_len -= SCTP_SIGNATURE_SIZE; 2507 if (*stcb == NULL) { 2508 /* this is the "normal" case... get a new TCB */ 2509 *stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh, 2510 cookie, cookie_len, *inp_p, 2511 netp, to, ¬ification, 2512 auth_skipped, auth_offset, auth_len, 2513 mflowtype, mflowid, 2514 vrf_id, port); 2515 } else { 2516 /* this is abnormal... cookie-echo on existing TCB */ 2517 had_a_existing_tcb = 1; 2518 *stcb = sctp_process_cookie_existing(m, iphlen, offset, 2519 src, dst, sh, 2520 cookie, cookie_len, *inp_p, *stcb, netp, to, 2521 ¬ification, auth_skipped, auth_offset, auth_len, 2522 mflowtype, mflowid, 2523 vrf_id, port); 2524 } 2525 2526 if (*stcb == NULL) { 2527 /* still no TCB... must be bad cookie-echo */ 2528 return (NULL); 2529 } 2530 if (*netp != NULL) { 2531 (*netp)->flowtype = mflowtype; 2532 (*netp)->flowid = mflowid; 2533 } 2534 /* 2535 * Ok, we built an association so confirm the address we sent the 2536 * INIT-ACK to. 2537 */ 2538 netl = sctp_findnet(*stcb, to); 2539 /* 2540 * This code should in theory NOT run but 2541 */ 2542 if (netl == NULL) { 2543 /* TSNH! Huh, why do I need to add this address here? */ 2544 if (sctp_add_remote_addr(*stcb, to, NULL, port, 2545 SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) { 2546 return (NULL); 2547 } 2548 netl = sctp_findnet(*stcb, to); 2549 } 2550 if (netl) { 2551 if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) { 2552 netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED; 2553 (void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL, 2554 netl); 2555 send_int_conf = 1; 2556 } 2557 } 2558 sctp_start_net_timers(*stcb); 2559 if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) { 2560 if (!had_a_existing_tcb || 2561 (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) { 2562 /* 2563 * If we have a NEW cookie or the connect never 2564 * reached the connected state during collision we 2565 * must do the TCP accept thing. 2566 */ 2567 struct socket *so, *oso; 2568 struct sctp_inpcb *inp; 2569 2570 if (notification == SCTP_NOTIFY_ASSOC_RESTART) { 2571 /* 2572 * For a restart we will keep the same 2573 * socket, no need to do anything. I THINK!! 2574 */ 2575 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2576 if (send_int_conf) { 2577 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2578 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2579 } 2580 return (m); 2581 } 2582 oso = (*inp_p)->sctp_socket; 2583 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2584 SCTP_TCB_UNLOCK((*stcb)); 2585 CURVNET_SET(oso->so_vnet); 2586 so = sonewconn(oso, 0 2587 ); 2588 CURVNET_RESTORE(); 2589 SCTP_TCB_LOCK((*stcb)); 2590 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2591 2592 if (so == NULL) { 2593 struct mbuf *op_err; 2594 2595 /* Too many sockets */ 2596 SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n"); 2597 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 2598 sctp_abort_association(*inp_p, NULL, m, iphlen, 2599 src, dst, sh, op_err, 2600 mflowtype, mflowid, 2601 vrf_id, port); 2602 (void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC, 2603 SCTP_FROM_SCTP_INPUT + SCTP_LOC_23); 2604 return (NULL); 2605 } 2606 inp = (struct sctp_inpcb *)so->so_pcb; 2607 SCTP_INP_INCR_REF(inp); 2608 /* 2609 * We add the unbound flag here so that if we get an 2610 * soabort() before we get the move_pcb done, we 2611 * will properly cleanup. 2612 */ 2613 inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE | 2614 SCTP_PCB_FLAGS_CONNECTED | 2615 SCTP_PCB_FLAGS_IN_TCPPOOL | 2616 SCTP_PCB_FLAGS_UNBOUND | 2617 (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) | 2618 SCTP_PCB_FLAGS_DONT_WAKE); 2619 inp->sctp_features = (*inp_p)->sctp_features; 2620 inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features; 2621 inp->sctp_socket = so; 2622 inp->sctp_frag_point = (*inp_p)->sctp_frag_point; 2623 inp->max_cwnd = (*inp_p)->max_cwnd; 2624 inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off; 2625 inp->ecn_supported = (*inp_p)->ecn_supported; 2626 inp->prsctp_supported = (*inp_p)->prsctp_supported; 2627 inp->auth_supported = (*inp_p)->auth_supported; 2628 inp->asconf_supported = (*inp_p)->asconf_supported; 2629 inp->reconfig_supported = (*inp_p)->reconfig_supported; 2630 inp->nrsack_supported = (*inp_p)->nrsack_supported; 2631 inp->pktdrop_supported = (*inp_p)->pktdrop_supported; 2632 inp->partial_delivery_point = (*inp_p)->partial_delivery_point; 2633 inp->sctp_context = (*inp_p)->sctp_context; 2634 inp->local_strreset_support = (*inp_p)->local_strreset_support; 2635 inp->fibnum = (*inp_p)->fibnum; 2636 inp->inp_starting_point_for_iterator = NULL; 2637 /* 2638 * copy in the authentication parameters from the 2639 * original endpoint 2640 */ 2641 if (inp->sctp_ep.local_hmacs) 2642 sctp_free_hmaclist(inp->sctp_ep.local_hmacs); 2643 inp->sctp_ep.local_hmacs = 2644 sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs); 2645 if (inp->sctp_ep.local_auth_chunks) 2646 sctp_free_chunklist(inp->sctp_ep.local_auth_chunks); 2647 inp->sctp_ep.local_auth_chunks = 2648 sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks); 2649 2650 /* 2651 * Now we must move it from one hash table to 2652 * another and get the tcb in the right place. 2653 */ 2654 2655 /* 2656 * This is where the one-2-one socket is put into 2657 * the accept state waiting for the accept! 2658 */ 2659 if (*stcb) { 2660 SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE); 2661 } 2662 sctp_move_pcb_and_assoc(*inp_p, inp, *stcb); 2663 2664 atomic_add_int(&(*stcb)->asoc.refcnt, 1); 2665 SCTP_TCB_UNLOCK((*stcb)); 2666 2667 sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, 2668 0); 2669 SCTP_TCB_LOCK((*stcb)); 2670 atomic_subtract_int(&(*stcb)->asoc.refcnt, 1); 2671 2672 /* 2673 * now we must check to see if we were aborted while 2674 * the move was going on and the lock/unlock 2675 * happened. 2676 */ 2677 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 2678 /* 2679 * yep it was, we leave the assoc attached 2680 * to the socket since the sctp_inpcb_free() 2681 * call will send an abort for us. 2682 */ 2683 SCTP_INP_DECR_REF(inp); 2684 return (NULL); 2685 } 2686 SCTP_INP_DECR_REF(inp); 2687 /* Switch over to the new guy */ 2688 *inp_p = inp; 2689 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2690 if (send_int_conf) { 2691 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2692 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2693 } 2694 2695 /* 2696 * Pull it from the incomplete queue and wake the 2697 * guy 2698 */ 2699 soisconnected(so); 2700 return (m); 2701 } 2702 } 2703 if (notification) { 2704 sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2705 } 2706 if (send_int_conf) { 2707 sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED, 2708 (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED); 2709 } 2710 return (m); 2711 } 2712 2713 static void 2714 sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED, 2715 struct sctp_tcb *stcb, struct sctp_nets *net) 2716 { 2717 /* cp must not be used, others call this without a c-ack :-) */ 2718 struct sctp_association *asoc; 2719 struct sctp_tmit_chunk *chk; 2720 2721 SCTPDBG(SCTP_DEBUG_INPUT2, 2722 "sctp_handle_cookie_ack: handling COOKIE-ACK\n"); 2723 if ((stcb == NULL) || (net == NULL)) { 2724 return; 2725 } 2726 2727 asoc = &stcb->asoc; 2728 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 2729 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 2730 asoc->overall_error_count, 2731 0, 2732 SCTP_FROM_SCTP_INPUT, 2733 __LINE__); 2734 } 2735 asoc->overall_error_count = 0; 2736 sctp_stop_all_cookie_timers(stcb); 2737 /* process according to association state */ 2738 if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) { 2739 /* state change only needed when I am in right state */ 2740 SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n"); 2741 SCTP_SET_STATE(stcb, SCTP_STATE_OPEN); 2742 sctp_start_net_timers(stcb); 2743 if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) { 2744 sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, 2745 stcb->sctp_ep, stcb, NULL); 2746 } 2747 /* update RTO */ 2748 SCTP_STAT_INCR_COUNTER32(sctps_activeestab); 2749 SCTP_STAT_INCR_GAUGE32(sctps_currestab); 2750 if (asoc->overall_error_count == 0) { 2751 sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered, 2752 SCTP_RTT_FROM_NON_DATA); 2753 } 2754 (void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered); 2755 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 2756 if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || 2757 (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { 2758 stcb->sctp_ep->sctp_flags |= SCTP_PCB_FLAGS_CONNECTED; 2759 if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) { 2760 soisconnected(stcb->sctp_socket); 2761 } 2762 } 2763 /* 2764 * since we did not send a HB make sure we don't double 2765 * things 2766 */ 2767 net->hb_responded = 1; 2768 2769 if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { 2770 /* 2771 * We don't need to do the asconf thing, nor hb or 2772 * autoclose if the socket is closed. 2773 */ 2774 goto closed_socket; 2775 } 2776 2777 sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, 2778 stcb, net); 2779 2780 if (stcb->asoc.sctp_autoclose_ticks && 2781 sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) { 2782 sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, 2783 stcb->sctp_ep, stcb, NULL); 2784 } 2785 /* 2786 * send ASCONF if parameters are pending and ASCONFs are 2787 * allowed (eg. addresses changed when init/cookie echo were 2788 * in flight) 2789 */ 2790 if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) && 2791 (stcb->asoc.asconf_supported == 1) && 2792 (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) { 2793 #ifdef SCTP_TIMER_BASED_ASCONF 2794 sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, 2795 stcb->sctp_ep, stcb, 2796 stcb->asoc.primary_destination); 2797 #else 2798 sctp_send_asconf(stcb, stcb->asoc.primary_destination, 2799 SCTP_ADDR_NOT_LOCKED); 2800 #endif 2801 } 2802 } 2803 closed_socket: 2804 /* Toss the cookie if I can */ 2805 sctp_toss_old_cookies(stcb, asoc); 2806 /* Restart the timer if we have pending data */ 2807 TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { 2808 if (chk->whoTo != NULL) { 2809 break; 2810 } 2811 } 2812 if (chk != NULL) { 2813 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 2814 } 2815 } 2816 2817 static void 2818 sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp, 2819 struct sctp_tcb *stcb) 2820 { 2821 struct sctp_nets *net; 2822 struct sctp_tmit_chunk *lchk; 2823 struct sctp_ecne_chunk bkup; 2824 uint8_t override_bit; 2825 uint32_t tsn, window_data_tsn; 2826 int len; 2827 unsigned int pkt_cnt; 2828 2829 len = ntohs(cp->ch.chunk_length); 2830 if ((len != sizeof(struct sctp_ecne_chunk)) && 2831 (len != sizeof(struct old_sctp_ecne_chunk))) { 2832 return; 2833 } 2834 if (len == sizeof(struct old_sctp_ecne_chunk)) { 2835 /* Its the old format */ 2836 memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk)); 2837 bkup.num_pkts_since_cwr = htonl(1); 2838 cp = &bkup; 2839 } 2840 SCTP_STAT_INCR(sctps_recvecne); 2841 tsn = ntohl(cp->tsn); 2842 pkt_cnt = ntohl(cp->num_pkts_since_cwr); 2843 lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead); 2844 if (lchk == NULL) { 2845 window_data_tsn = stcb->asoc.sending_seq - 1; 2846 } else { 2847 window_data_tsn = lchk->rec.data.tsn; 2848 } 2849 2850 /* Find where it was sent to if possible. */ 2851 net = NULL; 2852 TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) { 2853 if (lchk->rec.data.tsn == tsn) { 2854 net = lchk->whoTo; 2855 net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send; 2856 break; 2857 } 2858 if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) { 2859 break; 2860 } 2861 } 2862 if (net == NULL) { 2863 /* 2864 * What to do. A previous send of a CWR was possibly lost. 2865 * See how old it is, we may have it marked on the actual 2866 * net. 2867 */ 2868 TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) { 2869 if (tsn == net->last_cwr_tsn) { 2870 /* Found him, send it off */ 2871 break; 2872 } 2873 } 2874 if (net == NULL) { 2875 /* 2876 * If we reach here, we need to send a special CWR 2877 * that says hey, we did this a long time ago and 2878 * you lost the response. 2879 */ 2880 net = TAILQ_FIRST(&stcb->asoc.nets); 2881 if (net == NULL) { 2882 /* TSNH */ 2883 return; 2884 } 2885 override_bit = SCTP_CWR_REDUCE_OVERRIDE; 2886 } else { 2887 override_bit = 0; 2888 } 2889 } else { 2890 override_bit = 0; 2891 } 2892 if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) && 2893 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2894 /* 2895 * JRS - Use the congestion control given in the pluggable 2896 * CC module 2897 */ 2898 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt); 2899 /* 2900 * We reduce once every RTT. So we will only lower cwnd at 2901 * the next sending seq i.e. the window_data_tsn 2902 */ 2903 net->cwr_window_tsn = window_data_tsn; 2904 net->ecn_ce_pkt_cnt += pkt_cnt; 2905 net->lost_cnt = pkt_cnt; 2906 net->last_cwr_tsn = tsn; 2907 } else { 2908 override_bit |= SCTP_CWR_IN_SAME_WINDOW; 2909 if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) && 2910 ((override_bit & SCTP_CWR_REDUCE_OVERRIDE) == 0)) { 2911 /* 2912 * Another loss in the same window update how many 2913 * marks/packets lost we have had. 2914 */ 2915 int cnt = 1; 2916 2917 if (pkt_cnt > net->lost_cnt) { 2918 /* Should be the case */ 2919 cnt = (pkt_cnt - net->lost_cnt); 2920 net->ecn_ce_pkt_cnt += cnt; 2921 } 2922 net->lost_cnt = pkt_cnt; 2923 net->last_cwr_tsn = tsn; 2924 /* 2925 * Most CC functions will ignore this call, since we 2926 * are in-window yet of the initial CE the peer saw. 2927 */ 2928 stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt); 2929 } 2930 } 2931 /* 2932 * We always send a CWR this way if our previous one was lost our 2933 * peer will get an update, or if it is not time again to reduce we 2934 * still get the cwr to the peer. Note we set the override when we 2935 * could not find the TSN on the chunk or the destination network. 2936 */ 2937 sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit); 2938 } 2939 2940 static void 2941 sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net) 2942 { 2943 /* 2944 * Here we get a CWR from the peer. We must look in the outqueue and 2945 * make sure that we have a covered ECNE in the control chunk part. 2946 * If so remove it. 2947 */ 2948 struct sctp_tmit_chunk *chk, *nchk; 2949 struct sctp_ecne_chunk *ecne; 2950 int override; 2951 uint32_t cwr_tsn; 2952 2953 cwr_tsn = ntohl(cp->tsn); 2954 override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE; 2955 TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) { 2956 if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) { 2957 continue; 2958 } 2959 if ((override == 0) && (chk->whoTo != net)) { 2960 /* Must be from the right src unless override is set */ 2961 continue; 2962 } 2963 ecne = mtod(chk->data, struct sctp_ecne_chunk *); 2964 if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) { 2965 /* this covers this ECNE, we can remove it */ 2966 stcb->asoc.ecn_echo_cnt_onq--; 2967 TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk, 2968 sctp_next); 2969 stcb->asoc.ctrl_queue_cnt--; 2970 sctp_m_freem(chk->data); 2971 chk->data = NULL; 2972 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 2973 if (override == 0) { 2974 break; 2975 } 2976 } 2977 } 2978 } 2979 2980 static void 2981 sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED, 2982 struct sctp_tcb *stcb, struct sctp_nets *net) 2983 { 2984 2985 SCTPDBG(SCTP_DEBUG_INPUT2, 2986 "sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n"); 2987 if (stcb == NULL) 2988 return; 2989 2990 /* process according to association state */ 2991 if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) { 2992 /* unexpected SHUTDOWN-COMPLETE... so ignore... */ 2993 SCTPDBG(SCTP_DEBUG_INPUT2, 2994 "sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n"); 2995 SCTP_TCB_UNLOCK(stcb); 2996 return; 2997 } 2998 /* notify upper layer protocol */ 2999 if (stcb->sctp_socket) { 3000 sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED); 3001 } 3002 #ifdef INVARIANTS 3003 if (!TAILQ_EMPTY(&stcb->asoc.send_queue) || 3004 !TAILQ_EMPTY(&stcb->asoc.sent_queue) || 3005 sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) { 3006 panic("Queues are not empty when handling SHUTDOWN-COMPLETE"); 3007 } 3008 #endif 3009 /* stop the timer */ 3010 sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net, 3011 SCTP_FROM_SCTP_INPUT + SCTP_LOC_24); 3012 SCTP_STAT_INCR_COUNTER32(sctps_shutdown); 3013 /* free the TCB */ 3014 SCTPDBG(SCTP_DEBUG_INPUT2, 3015 "sctp_handle_shutdown_complete: calls free-asoc\n"); 3016 (void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC, 3017 SCTP_FROM_SCTP_INPUT + SCTP_LOC_25); 3018 return; 3019 } 3020 3021 static int 3022 process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc, 3023 struct sctp_nets *net, uint8_t flg) 3024 { 3025 switch (desc->chunk_type) { 3026 case SCTP_DATA: 3027 case SCTP_IDATA: 3028 /* find the tsn to resend (possibly) */ 3029 { 3030 uint32_t tsn; 3031 struct sctp_tmit_chunk *tp1; 3032 3033 tsn = ntohl(desc->tsn_ifany); 3034 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3035 if (tp1->rec.data.tsn == tsn) { 3036 /* found it */ 3037 break; 3038 } 3039 if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) { 3040 /* not found */ 3041 tp1 = NULL; 3042 break; 3043 } 3044 } 3045 if (tp1 == NULL) { 3046 /* 3047 * Do it the other way , aka without paying 3048 * attention to queue seq order. 3049 */ 3050 SCTP_STAT_INCR(sctps_pdrpdnfnd); 3051 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3052 if (tp1->rec.data.tsn == tsn) { 3053 /* found it */ 3054 break; 3055 } 3056 } 3057 } 3058 if (tp1 == NULL) { 3059 SCTP_STAT_INCR(sctps_pdrptsnnf); 3060 } 3061 if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) { 3062 if (((flg & SCTP_BADCRC) == 0) && 3063 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3064 return (0); 3065 } 3066 if ((stcb->asoc.peers_rwnd == 0) && 3067 ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) { 3068 SCTP_STAT_INCR(sctps_pdrpdiwnp); 3069 return (0); 3070 } 3071 if (stcb->asoc.peers_rwnd == 0 && 3072 (flg & SCTP_FROM_MIDDLE_BOX)) { 3073 SCTP_STAT_INCR(sctps_pdrpdizrw); 3074 return (0); 3075 } 3076 if ((uint32_t)SCTP_BUF_LEN(tp1->data) < 3077 SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) { 3078 /* Payload not matching. */ 3079 SCTP_STAT_INCR(sctps_pdrpbadd); 3080 return (-1); 3081 } 3082 if (memcmp(mtod(tp1->data, caddr_t)+SCTP_DATA_CHUNK_OVERHEAD(stcb), 3083 desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) { 3084 /* Payload not matching. */ 3085 SCTP_STAT_INCR(sctps_pdrpbadd); 3086 return (-1); 3087 } 3088 if (tp1->do_rtt) { 3089 /* 3090 * this guy had a RTO calculation 3091 * pending on it, cancel it 3092 */ 3093 if (tp1->whoTo->rto_needed == 0) { 3094 tp1->whoTo->rto_needed = 1; 3095 } 3096 tp1->do_rtt = 0; 3097 } 3098 SCTP_STAT_INCR(sctps_pdrpmark); 3099 if (tp1->sent != SCTP_DATAGRAM_RESEND) 3100 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3101 /* 3102 * mark it as if we were doing a FR, since 3103 * we will be getting gap ack reports behind 3104 * the info from the router. 3105 */ 3106 tp1->rec.data.doing_fast_retransmit = 1; 3107 /* 3108 * mark the tsn with what sequences can 3109 * cause a new FR. 3110 */ 3111 if (TAILQ_EMPTY(&stcb->asoc.send_queue)) { 3112 tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq; 3113 } else { 3114 tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn; 3115 } 3116 3117 /* restart the timer */ 3118 sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3119 stcb, tp1->whoTo, 3120 SCTP_FROM_SCTP_INPUT + SCTP_LOC_26); 3121 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, 3122 stcb, tp1->whoTo); 3123 3124 /* fix counts and things */ 3125 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { 3126 sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP, 3127 tp1->whoTo->flight_size, 3128 tp1->book_size, 3129 (uint32_t)(uintptr_t)stcb, 3130 tp1->rec.data.tsn); 3131 } 3132 if (tp1->sent < SCTP_DATAGRAM_RESEND) { 3133 sctp_flight_size_decrease(tp1); 3134 sctp_total_flight_decrease(stcb, tp1); 3135 } 3136 tp1->sent = SCTP_DATAGRAM_RESEND; 3137 } { 3138 /* audit code */ 3139 unsigned int audit; 3140 3141 audit = 0; 3142 TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) { 3143 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3144 audit++; 3145 } 3146 TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue, 3147 sctp_next) { 3148 if (tp1->sent == SCTP_DATAGRAM_RESEND) 3149 audit++; 3150 } 3151 if (audit != stcb->asoc.sent_queue_retran_cnt) { 3152 SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n", 3153 audit, stcb->asoc.sent_queue_retran_cnt); 3154 #ifndef SCTP_AUDITING_ENABLED 3155 stcb->asoc.sent_queue_retran_cnt = audit; 3156 #endif 3157 } 3158 } 3159 } 3160 break; 3161 case SCTP_ASCONF: 3162 { 3163 struct sctp_tmit_chunk *asconf; 3164 3165 TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue, 3166 sctp_next) { 3167 if (asconf->rec.chunk_id.id == SCTP_ASCONF) { 3168 break; 3169 } 3170 } 3171 if (asconf) { 3172 if (asconf->sent != SCTP_DATAGRAM_RESEND) 3173 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3174 asconf->sent = SCTP_DATAGRAM_RESEND; 3175 asconf->snd_count--; 3176 } 3177 } 3178 break; 3179 case SCTP_INITIATION: 3180 /* resend the INIT */ 3181 stcb->asoc.dropped_special_cnt++; 3182 if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) { 3183 /* 3184 * If we can get it in, in a few attempts we do 3185 * this, otherwise we let the timer fire. 3186 */ 3187 sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, 3188 stcb, net, 3189 SCTP_FROM_SCTP_INPUT + SCTP_LOC_27); 3190 sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED); 3191 } 3192 break; 3193 case SCTP_SELECTIVE_ACK: 3194 case SCTP_NR_SELECTIVE_ACK: 3195 /* resend the sack */ 3196 sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED); 3197 break; 3198 case SCTP_HEARTBEAT_REQUEST: 3199 /* resend a demand HB */ 3200 if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) { 3201 /* 3202 * Only retransmit if we KNOW we wont destroy the 3203 * tcb 3204 */ 3205 sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED); 3206 } 3207 break; 3208 case SCTP_SHUTDOWN: 3209 sctp_send_shutdown(stcb, net); 3210 break; 3211 case SCTP_SHUTDOWN_ACK: 3212 sctp_send_shutdown_ack(stcb, net); 3213 break; 3214 case SCTP_COOKIE_ECHO: 3215 { 3216 struct sctp_tmit_chunk *cookie; 3217 3218 cookie = NULL; 3219 TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, 3220 sctp_next) { 3221 if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) { 3222 break; 3223 } 3224 } 3225 if (cookie) { 3226 if (cookie->sent != SCTP_DATAGRAM_RESEND) 3227 sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); 3228 cookie->sent = SCTP_DATAGRAM_RESEND; 3229 sctp_stop_all_cookie_timers(stcb); 3230 } 3231 } 3232 break; 3233 case SCTP_COOKIE_ACK: 3234 sctp_send_cookie_ack(stcb); 3235 break; 3236 case SCTP_ASCONF_ACK: 3237 /* resend last asconf ack */ 3238 sctp_send_asconf_ack(stcb); 3239 break; 3240 case SCTP_IFORWARD_CUM_TSN: 3241 case SCTP_FORWARD_CUM_TSN: 3242 send_forward_tsn(stcb, &stcb->asoc); 3243 break; 3244 /* can't do anything with these */ 3245 case SCTP_PACKET_DROPPED: 3246 case SCTP_INITIATION_ACK: /* this should not happen */ 3247 case SCTP_HEARTBEAT_ACK: 3248 case SCTP_ABORT_ASSOCIATION: 3249 case SCTP_OPERATION_ERROR: 3250 case SCTP_SHUTDOWN_COMPLETE: 3251 case SCTP_ECN_ECHO: 3252 case SCTP_ECN_CWR: 3253 default: 3254 break; 3255 } 3256 return (0); 3257 } 3258 3259 void 3260 sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3261 { 3262 uint32_t i; 3263 uint16_t temp; 3264 3265 /* 3266 * We set things to 0xffffffff since this is the last delivered 3267 * sequence and we will be sending in 0 after the reset. 3268 */ 3269 3270 if (number_entries) { 3271 for (i = 0; i < number_entries; i++) { 3272 temp = ntohs(list[i]); 3273 if (temp >= stcb->asoc.streamincnt) { 3274 continue; 3275 } 3276 stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff; 3277 } 3278 } else { 3279 list = NULL; 3280 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3281 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3282 } 3283 } 3284 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3285 } 3286 3287 static void 3288 sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3289 { 3290 uint32_t i; 3291 uint16_t temp; 3292 3293 if (number_entries > 0) { 3294 for (i = 0; i < number_entries; i++) { 3295 temp = ntohs(list[i]); 3296 if (temp >= stcb->asoc.streamoutcnt) { 3297 /* no such stream */ 3298 continue; 3299 } 3300 stcb->asoc.strmout[temp].next_mid_ordered = 0; 3301 stcb->asoc.strmout[temp].next_mid_unordered = 0; 3302 } 3303 } else { 3304 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3305 stcb->asoc.strmout[i].next_mid_ordered = 0; 3306 stcb->asoc.strmout[i].next_mid_unordered = 0; 3307 } 3308 } 3309 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED); 3310 } 3311 3312 static void 3313 sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list) 3314 { 3315 uint32_t i; 3316 uint16_t temp; 3317 3318 if (number_entries > 0) { 3319 for (i = 0; i < number_entries; i++) { 3320 temp = ntohs(list[i]); 3321 if (temp >= stcb->asoc.streamoutcnt) { 3322 /* no such stream */ 3323 continue; 3324 } 3325 stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN; 3326 } 3327 } else { 3328 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3329 stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN; 3330 } 3331 } 3332 } 3333 3334 struct sctp_stream_reset_request * 3335 sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk) 3336 { 3337 struct sctp_association *asoc; 3338 struct sctp_chunkhdr *ch; 3339 struct sctp_stream_reset_request *r; 3340 struct sctp_tmit_chunk *chk; 3341 int len, clen; 3342 3343 asoc = &stcb->asoc; 3344 if (TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 3345 asoc->stream_reset_outstanding = 0; 3346 return (NULL); 3347 } 3348 if (stcb->asoc.str_reset == NULL) { 3349 asoc->stream_reset_outstanding = 0; 3350 return (NULL); 3351 } 3352 chk = stcb->asoc.str_reset; 3353 if (chk->data == NULL) { 3354 return (NULL); 3355 } 3356 if (bchk) { 3357 /* he wants a copy of the chk pointer */ 3358 *bchk = chk; 3359 } 3360 clen = chk->send_size; 3361 ch = mtod(chk->data, struct sctp_chunkhdr *); 3362 r = (struct sctp_stream_reset_request *)(ch + 1); 3363 if (ntohl(r->request_seq) == seq) { 3364 /* found it */ 3365 return (r); 3366 } 3367 len = SCTP_SIZE32(ntohs(r->ph.param_length)); 3368 if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) { 3369 /* move to the next one, there can only be a max of two */ 3370 r = (struct sctp_stream_reset_request *)((caddr_t)r + len); 3371 if (ntohl(r->request_seq) == seq) { 3372 return (r); 3373 } 3374 } 3375 /* that seq is not here */ 3376 return (NULL); 3377 } 3378 3379 static void 3380 sctp_clean_up_stream_reset(struct sctp_tcb *stcb) 3381 { 3382 struct sctp_association *asoc; 3383 struct sctp_tmit_chunk *chk; 3384 3385 asoc = &stcb->asoc; 3386 chk = asoc->str_reset; 3387 if (chk == NULL) { 3388 return; 3389 } 3390 asoc->str_reset = NULL; 3391 sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb, 3392 NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28); 3393 TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next); 3394 asoc->ctrl_queue_cnt--; 3395 if (chk->data) { 3396 sctp_m_freem(chk->data); 3397 chk->data = NULL; 3398 } 3399 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3400 } 3401 3402 static int 3403 sctp_handle_stream_reset_response(struct sctp_tcb *stcb, 3404 uint32_t seq, uint32_t action, 3405 struct sctp_stream_reset_response *respin) 3406 { 3407 uint16_t type; 3408 int lparam_len; 3409 struct sctp_association *asoc = &stcb->asoc; 3410 struct sctp_tmit_chunk *chk; 3411 struct sctp_stream_reset_request *req_param; 3412 struct sctp_stream_reset_out_request *req_out_param; 3413 struct sctp_stream_reset_in_request *req_in_param; 3414 uint32_t number_entries; 3415 3416 if (asoc->stream_reset_outstanding == 0) { 3417 /* duplicate */ 3418 return (0); 3419 } 3420 if (seq == stcb->asoc.str_reset_seq_out) { 3421 req_param = sctp_find_stream_reset(stcb, seq, &chk); 3422 if (req_param != NULL) { 3423 stcb->asoc.str_reset_seq_out++; 3424 type = ntohs(req_param->ph.param_type); 3425 lparam_len = ntohs(req_param->ph.param_length); 3426 if (type == SCTP_STR_RESET_OUT_REQUEST) { 3427 int no_clear = 0; 3428 3429 req_out_param = (struct sctp_stream_reset_out_request *)req_param; 3430 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t); 3431 asoc->stream_reset_out_is_outstanding = 0; 3432 if (asoc->stream_reset_outstanding) 3433 asoc->stream_reset_outstanding--; 3434 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3435 /* do it */ 3436 sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams); 3437 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3438 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3439 } else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) { 3440 /* 3441 * Set it up so we don't stop 3442 * retransmitting 3443 */ 3444 asoc->stream_reset_outstanding++; 3445 stcb->asoc.str_reset_seq_out--; 3446 asoc->stream_reset_out_is_outstanding = 1; 3447 no_clear = 1; 3448 } else { 3449 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3450 } 3451 if (no_clear == 0) { 3452 sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams); 3453 } 3454 } else if (type == SCTP_STR_RESET_IN_REQUEST) { 3455 req_in_param = (struct sctp_stream_reset_in_request *)req_param; 3456 number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t); 3457 if (asoc->stream_reset_outstanding) 3458 asoc->stream_reset_outstanding--; 3459 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3460 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb, 3461 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3462 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3463 sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb, 3464 number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED); 3465 } 3466 } else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) { 3467 /* Ok we now may have more streams */ 3468 int num_stream; 3469 3470 num_stream = stcb->asoc.strm_pending_add_size; 3471 if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) { 3472 /* TSNH */ 3473 num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt; 3474 } 3475 stcb->asoc.strm_pending_add_size = 0; 3476 if (asoc->stream_reset_outstanding) 3477 asoc->stream_reset_outstanding--; 3478 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3479 /* Put the new streams into effect */ 3480 int i; 3481 3482 for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) { 3483 asoc->strmout[i].state = SCTP_STREAM_OPEN; 3484 } 3485 asoc->streamoutcnt += num_stream; 3486 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3487 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3488 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3489 SCTP_STREAM_CHANGE_DENIED); 3490 } else { 3491 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3492 SCTP_STREAM_CHANGE_FAILED); 3493 } 3494 } else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) { 3495 if (asoc->stream_reset_outstanding) 3496 asoc->stream_reset_outstanding--; 3497 if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3498 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3499 SCTP_STREAM_CHANGE_DENIED); 3500 } else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) { 3501 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 3502 SCTP_STREAM_CHANGE_FAILED); 3503 } 3504 } else if (type == SCTP_STR_RESET_TSN_REQUEST) { 3505 /** 3506 * a) Adopt the new in tsn. 3507 * b) reset the map 3508 * c) Adopt the new out-tsn 3509 */ 3510 struct sctp_stream_reset_response_tsn *resp; 3511 struct sctp_forward_tsn_chunk fwdtsn; 3512 int abort_flag = 0; 3513 3514 if (respin == NULL) { 3515 /* huh ? */ 3516 return (0); 3517 } 3518 if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) { 3519 return (0); 3520 } 3521 if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) { 3522 resp = (struct sctp_stream_reset_response_tsn *)respin; 3523 asoc->stream_reset_outstanding--; 3524 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3525 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3526 fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1); 3527 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3528 if (abort_flag) { 3529 return (1); 3530 } 3531 stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1); 3532 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3533 sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3534 } 3535 3536 stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map; 3537 stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn); 3538 memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); 3539 3540 stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map; 3541 memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size); 3542 3543 stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn); 3544 stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn; 3545 3546 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3547 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3548 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0); 3549 } else if (action == SCTP_STREAM_RESET_RESULT_DENIED) { 3550 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3551 SCTP_ASSOC_RESET_DENIED); 3552 } else { 3553 sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 3554 SCTP_ASSOC_RESET_FAILED); 3555 } 3556 } 3557 /* get rid of the request and get the request flags */ 3558 if (asoc->stream_reset_outstanding == 0) { 3559 sctp_clean_up_stream_reset(stcb); 3560 } 3561 } 3562 } 3563 if (asoc->stream_reset_outstanding == 0) { 3564 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3565 } 3566 return (0); 3567 } 3568 3569 static void 3570 sctp_handle_str_reset_request_in(struct sctp_tcb *stcb, 3571 struct sctp_tmit_chunk *chk, 3572 struct sctp_stream_reset_in_request *req, int trunc) 3573 { 3574 uint32_t seq; 3575 int len, i; 3576 int number_entries; 3577 uint16_t temp; 3578 3579 /* 3580 * peer wants me to send a str-reset to him for my outgoing seq's if 3581 * seq_in is right. 3582 */ 3583 struct sctp_association *asoc = &stcb->asoc; 3584 3585 seq = ntohl(req->request_seq); 3586 if (asoc->str_reset_seq_in == seq) { 3587 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3588 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3589 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3590 } else if (trunc) { 3591 /* Can't do it, since they exceeded our buffer size */ 3592 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3593 } else if (stcb->asoc.stream_reset_out_is_outstanding == 0) { 3594 len = ntohs(req->ph.param_length); 3595 number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t)); 3596 if (number_entries) { 3597 for (i = 0; i < number_entries; i++) { 3598 temp = ntohs(req->list_of_streams[i]); 3599 if (temp >= stcb->asoc.streamoutcnt) { 3600 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3601 goto bad_boy; 3602 } 3603 req->list_of_streams[i] = temp; 3604 } 3605 for (i = 0; i < number_entries; i++) { 3606 if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) { 3607 stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING; 3608 } 3609 } 3610 } else { 3611 /* Its all */ 3612 for (i = 0; i < stcb->asoc.streamoutcnt; i++) { 3613 if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN) 3614 stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING; 3615 } 3616 } 3617 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3618 } else { 3619 /* Can't do it, since we have sent one out */ 3620 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3621 } 3622 bad_boy: 3623 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3624 asoc->str_reset_seq_in++; 3625 } else if (asoc->str_reset_seq_in - 1 == seq) { 3626 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3627 } else if (asoc->str_reset_seq_in - 2 == seq) { 3628 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3629 } else { 3630 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3631 } 3632 sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED); 3633 } 3634 3635 static int 3636 sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb, 3637 struct sctp_tmit_chunk *chk, 3638 struct sctp_stream_reset_tsn_request *req) 3639 { 3640 /* reset all in and out and update the tsn */ 3641 /* 3642 * A) reset my str-seq's on in and out. B) Select a receive next, 3643 * and set cum-ack to it. Also process this selected number as a 3644 * fwd-tsn as well. C) set in the response my next sending seq. 3645 */ 3646 struct sctp_forward_tsn_chunk fwdtsn; 3647 struct sctp_association *asoc = &stcb->asoc; 3648 int abort_flag = 0; 3649 uint32_t seq; 3650 3651 seq = ntohl(req->request_seq); 3652 if (asoc->str_reset_seq_in == seq) { 3653 asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3654 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3655 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3656 } else { 3657 fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk)); 3658 fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN; 3659 fwdtsn.ch.chunk_flags = 0; 3660 fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1); 3661 sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0); 3662 if (abort_flag) { 3663 return (1); 3664 } 3665 asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA; 3666 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { 3667 sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); 3668 } 3669 asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map; 3670 asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1; 3671 memset(asoc->mapping_array, 0, asoc->mapping_array_size); 3672 asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map; 3673 memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size); 3674 atomic_add_int(&asoc->sending_seq, 1); 3675 /* save off historical data for retrans */ 3676 asoc->last_sending_seq[1] = asoc->last_sending_seq[0]; 3677 asoc->last_sending_seq[0] = asoc->sending_seq; 3678 asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0]; 3679 asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn; 3680 sctp_reset_out_streams(stcb, 0, (uint16_t *)NULL); 3681 sctp_reset_in_stream(stcb, 0, (uint16_t *)NULL); 3682 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3683 sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0); 3684 } 3685 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3686 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3687 asoc->str_reset_seq_in++; 3688 } else if (asoc->str_reset_seq_in - 1 == seq) { 3689 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0], 3690 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]); 3691 } else if (asoc->str_reset_seq_in - 2 == seq) { 3692 sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1], 3693 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]); 3694 } else { 3695 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3696 } 3697 return (0); 3698 } 3699 3700 static void 3701 sctp_handle_str_reset_request_out(struct sctp_tcb *stcb, 3702 struct sctp_tmit_chunk *chk, 3703 struct sctp_stream_reset_out_request *req, int trunc) 3704 { 3705 uint32_t seq, tsn; 3706 int number_entries, len; 3707 struct sctp_association *asoc = &stcb->asoc; 3708 3709 seq = ntohl(req->request_seq); 3710 3711 /* now if its not a duplicate we process it */ 3712 if (asoc->str_reset_seq_in == seq) { 3713 len = ntohs(req->ph.param_length); 3714 number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t)); 3715 /* 3716 * the sender is resetting, handle the list issue.. we must 3717 * a) verify if we can do the reset, if so no problem b) If 3718 * we can't do the reset we must copy the request. c) queue 3719 * it, and setup the data in processor to trigger it off 3720 * when needed and dequeue all the queued data. 3721 */ 3722 tsn = ntohl(req->send_reset_at_tsn); 3723 3724 /* move the reset action back one */ 3725 asoc->last_reset_action[1] = asoc->last_reset_action[0]; 3726 if (!(asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ)) { 3727 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3728 } else if (trunc) { 3729 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3730 } else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) { 3731 /* we can do it now */ 3732 sctp_reset_in_stream(stcb, number_entries, req->list_of_streams); 3733 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3734 } else { 3735 /* 3736 * we must queue it up and thus wait for the TSN's 3737 * to arrive that are at or before tsn 3738 */ 3739 struct sctp_stream_reset_list *liste; 3740 int siz; 3741 3742 siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t)); 3743 SCTP_MALLOC(liste, struct sctp_stream_reset_list *, 3744 siz, SCTP_M_STRESET); 3745 if (liste == NULL) { 3746 /* gak out of memory */ 3747 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3748 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3749 return; 3750 } 3751 liste->seq = seq; 3752 liste->tsn = tsn; 3753 liste->number_entries = number_entries; 3754 memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t)); 3755 TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp); 3756 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS; 3757 } 3758 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3759 asoc->str_reset_seq_in++; 3760 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3761 /* 3762 * one seq back, just echo back last action since my 3763 * response was lost. 3764 */ 3765 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3766 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3767 /* 3768 * two seq back, just echo back last action since my 3769 * response was lost. 3770 */ 3771 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3772 } else { 3773 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3774 } 3775 } 3776 3777 static void 3778 sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3779 struct sctp_stream_reset_add_strm *str_add) 3780 { 3781 /* 3782 * Peer is requesting to add more streams. If its within our 3783 * max-streams we will allow it. 3784 */ 3785 uint32_t num_stream, i; 3786 uint32_t seq; 3787 struct sctp_association *asoc = &stcb->asoc; 3788 struct sctp_queued_to_read *ctl, *nctl; 3789 3790 /* Get the number. */ 3791 seq = ntohl(str_add->request_seq); 3792 num_stream = ntohs(str_add->number_of_streams); 3793 /* Now what would be the new total? */ 3794 if (asoc->str_reset_seq_in == seq) { 3795 num_stream += stcb->asoc.streamincnt; 3796 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3797 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3798 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3799 } else if ((num_stream > stcb->asoc.max_inbound_streams) || 3800 (num_stream > 0xffff)) { 3801 /* We must reject it they ask for to many */ 3802 denied: 3803 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3804 } else { 3805 /* Ok, we can do that :-) */ 3806 struct sctp_stream_in *oldstrm; 3807 3808 /* save off the old */ 3809 oldstrm = stcb->asoc.strmin; 3810 SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *, 3811 (num_stream * sizeof(struct sctp_stream_in)), 3812 SCTP_M_STRMI); 3813 if (stcb->asoc.strmin == NULL) { 3814 stcb->asoc.strmin = oldstrm; 3815 goto denied; 3816 } 3817 /* copy off the old data */ 3818 for (i = 0; i < stcb->asoc.streamincnt; i++) { 3819 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3820 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3821 stcb->asoc.strmin[i].sid = i; 3822 stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered; 3823 stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started; 3824 stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started; 3825 /* now anything on those queues? */ 3826 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) { 3827 TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm); 3828 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm); 3829 } 3830 TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) { 3831 TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm); 3832 TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm); 3833 } 3834 } 3835 /* Init the new streams */ 3836 for (i = stcb->asoc.streamincnt; i < num_stream; i++) { 3837 TAILQ_INIT(&stcb->asoc.strmin[i].inqueue); 3838 TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue); 3839 stcb->asoc.strmin[i].sid = i; 3840 stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff; 3841 stcb->asoc.strmin[i].pd_api_started = 0; 3842 stcb->asoc.strmin[i].delivery_started = 0; 3843 } 3844 SCTP_FREE(oldstrm, SCTP_M_STRMI); 3845 /* update the size */ 3846 stcb->asoc.streamincnt = num_stream; 3847 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3848 sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0); 3849 } 3850 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3851 asoc->str_reset_seq_in++; 3852 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3853 /* 3854 * one seq back, just echo back last action since my 3855 * response was lost. 3856 */ 3857 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3858 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3859 /* 3860 * two seq back, just echo back last action since my 3861 * response was lost. 3862 */ 3863 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3864 } else { 3865 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3866 } 3867 } 3868 3869 static void 3870 sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk, 3871 struct sctp_stream_reset_add_strm *str_add) 3872 { 3873 /* 3874 * Peer is requesting to add more streams. If its within our 3875 * max-streams we will allow it. 3876 */ 3877 uint16_t num_stream; 3878 uint32_t seq; 3879 struct sctp_association *asoc = &stcb->asoc; 3880 3881 /* Get the number. */ 3882 seq = ntohl(str_add->request_seq); 3883 num_stream = ntohs(str_add->number_of_streams); 3884 /* Now what would be the new total? */ 3885 if (asoc->str_reset_seq_in == seq) { 3886 stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0]; 3887 if (!(asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ)) { 3888 asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3889 } else if (stcb->asoc.stream_reset_outstanding) { 3890 /* We must reject it we have something pending */ 3891 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS; 3892 } else { 3893 /* Ok, we can do that :-) */ 3894 int mychk; 3895 3896 mychk = stcb->asoc.streamoutcnt; 3897 mychk += num_stream; 3898 if (mychk < 0x10000) { 3899 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED; 3900 if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) { 3901 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3902 } 3903 } else { 3904 stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED; 3905 } 3906 } 3907 sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]); 3908 asoc->str_reset_seq_in++; 3909 } else if ((asoc->str_reset_seq_in - 1) == seq) { 3910 /* 3911 * one seq back, just echo back last action since my 3912 * response was lost. 3913 */ 3914 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]); 3915 } else if ((asoc->str_reset_seq_in - 2) == seq) { 3916 /* 3917 * two seq back, just echo back last action since my 3918 * response was lost. 3919 */ 3920 sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]); 3921 } else { 3922 sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO); 3923 } 3924 } 3925 3926 #ifdef __GNUC__ 3927 __attribute__((noinline)) 3928 #endif 3929 static int 3930 sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset, 3931 struct sctp_chunkhdr *ch_req) 3932 { 3933 uint16_t remaining_length, param_len, ptype; 3934 struct sctp_paramhdr pstore; 3935 uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE]; 3936 uint32_t seq = 0; 3937 int num_req = 0; 3938 int trunc = 0; 3939 struct sctp_tmit_chunk *chk; 3940 struct sctp_chunkhdr *ch; 3941 struct sctp_paramhdr *ph; 3942 int ret_code = 0; 3943 int num_param = 0; 3944 3945 /* now it may be a reset or a reset-response */ 3946 remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr); 3947 3948 /* setup for adding the response */ 3949 sctp_alloc_a_chunk(stcb, chk); 3950 if (chk == NULL) { 3951 return (ret_code); 3952 } 3953 chk->copy_by_ref = 0; 3954 chk->rec.chunk_id.id = SCTP_STREAM_RESET; 3955 chk->rec.chunk_id.can_take_data = 0; 3956 chk->flags = 0; 3957 chk->asoc = &stcb->asoc; 3958 chk->no_fr_allowed = 0; 3959 chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr); 3960 chk->book_size_scale = 0; 3961 chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA); 3962 if (chk->data == NULL) { 3963 strres_nochunk: 3964 if (chk->data) { 3965 sctp_m_freem(chk->data); 3966 chk->data = NULL; 3967 } 3968 sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED); 3969 return (ret_code); 3970 } 3971 SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD); 3972 3973 /* setup chunk parameters */ 3974 chk->sent = SCTP_DATAGRAM_UNSENT; 3975 chk->snd_count = 0; 3976 chk->whoTo = NULL; 3977 3978 ch = mtod(chk->data, struct sctp_chunkhdr *); 3979 ch->chunk_type = SCTP_STREAM_RESET; 3980 ch->chunk_flags = 0; 3981 ch->chunk_length = htons(chk->send_size); 3982 SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size); 3983 offset += sizeof(struct sctp_chunkhdr); 3984 while (remaining_length >= sizeof(struct sctp_paramhdr)) { 3985 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore); 3986 if (ph == NULL) { 3987 /* TSNH */ 3988 break; 3989 } 3990 param_len = ntohs(ph->param_length); 3991 if ((param_len > remaining_length) || 3992 (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) { 3993 /* bad parameter length */ 3994 break; 3995 } 3996 ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)), 3997 (uint8_t *)&cstore); 3998 if (ph == NULL) { 3999 /* TSNH */ 4000 break; 4001 } 4002 ptype = ntohs(ph->param_type); 4003 num_param++; 4004 if (param_len > sizeof(cstore)) { 4005 trunc = 1; 4006 } else { 4007 trunc = 0; 4008 } 4009 if (num_param > SCTP_MAX_RESET_PARAMS) { 4010 /* hit the max of parameters already sorry.. */ 4011 break; 4012 } 4013 if (ptype == SCTP_STR_RESET_OUT_REQUEST) { 4014 struct sctp_stream_reset_out_request *req_out; 4015 4016 if (param_len < sizeof(struct sctp_stream_reset_out_request)) { 4017 break; 4018 } 4019 req_out = (struct sctp_stream_reset_out_request *)ph; 4020 num_req++; 4021 if (stcb->asoc.stream_reset_outstanding) { 4022 seq = ntohl(req_out->response_seq); 4023 if (seq == stcb->asoc.str_reset_seq_out) { 4024 /* implicit ack */ 4025 (void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL); 4026 } 4027 } 4028 sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc); 4029 } else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) { 4030 struct sctp_stream_reset_add_strm *str_add; 4031 4032 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4033 break; 4034 } 4035 str_add = (struct sctp_stream_reset_add_strm *)ph; 4036 num_req++; 4037 sctp_handle_str_reset_add_strm(stcb, chk, str_add); 4038 } else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) { 4039 struct sctp_stream_reset_add_strm *str_add; 4040 4041 if (param_len < sizeof(struct sctp_stream_reset_add_strm)) { 4042 break; 4043 } 4044 str_add = (struct sctp_stream_reset_add_strm *)ph; 4045 num_req++; 4046 sctp_handle_str_reset_add_out_strm(stcb, chk, str_add); 4047 } else if (ptype == SCTP_STR_RESET_IN_REQUEST) { 4048 struct sctp_stream_reset_in_request *req_in; 4049 4050 num_req++; 4051 req_in = (struct sctp_stream_reset_in_request *)ph; 4052 sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc); 4053 } else if (ptype == SCTP_STR_RESET_TSN_REQUEST) { 4054 struct sctp_stream_reset_tsn_request *req_tsn; 4055 4056 num_req++; 4057 req_tsn = (struct sctp_stream_reset_tsn_request *)ph; 4058 if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) { 4059 ret_code = 1; 4060 goto strres_nochunk; 4061 } 4062 /* no more */ 4063 break; 4064 } else if (ptype == SCTP_STR_RESET_RESPONSE) { 4065 struct sctp_stream_reset_response *resp; 4066 uint32_t result; 4067 4068 if (param_len < sizeof(struct sctp_stream_reset_response)) { 4069 break; 4070 } 4071 resp = (struct sctp_stream_reset_response *)ph; 4072 seq = ntohl(resp->response_seq); 4073 result = ntohl(resp->result); 4074 if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) { 4075 ret_code = 1; 4076 goto strres_nochunk; 4077 } 4078 } else { 4079 break; 4080 } 4081 offset += SCTP_SIZE32(param_len); 4082 if (remaining_length >= SCTP_SIZE32(param_len)) { 4083 remaining_length -= SCTP_SIZE32(param_len); 4084 } else { 4085 remaining_length = 0; 4086 } 4087 } 4088 if (num_req == 0) { 4089 /* we have no response free the stuff */ 4090 goto strres_nochunk; 4091 } 4092 /* ok we have a chunk to link in */ 4093 TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue, 4094 chk, 4095 sctp_next); 4096 stcb->asoc.ctrl_queue_cnt++; 4097 return (ret_code); 4098 } 4099 4100 /* 4101 * Handle a router or endpoints report of a packet loss, there are two ways 4102 * to handle this, either we get the whole packet and must disect it 4103 * ourselves (possibly with truncation and or corruption) or it is a summary 4104 * from a middle box that did the disectting for us. 4105 */ 4106 static void 4107 sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp, 4108 struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit) 4109 { 4110 struct sctp_chunk_desc desc; 4111 struct sctp_chunkhdr *chk_hdr; 4112 struct sctp_data_chunk *data_chunk; 4113 struct sctp_idata_chunk *idata_chunk; 4114 uint32_t bottle_bw, on_queue; 4115 uint32_t offset, chk_len; 4116 uint16_t pktdrp_len; 4117 uint8_t pktdrp_flags; 4118 4119 KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit, 4120 ("PKTDROP chunk too small")); 4121 pktdrp_flags = cp->ch.chunk_flags; 4122 pktdrp_len = ntohs(cp->ch.chunk_length); 4123 KASSERT(limit <= pktdrp_len, ("Inconsistent limit")); 4124 if (pktdrp_flags & SCTP_PACKET_TRUNCATED) { 4125 if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) { 4126 /* The peer plays games with us. */ 4127 return; 4128 } 4129 } 4130 limit -= sizeof(struct sctp_pktdrop_chunk); 4131 offset = 0; 4132 if (offset == limit) { 4133 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4134 SCTP_STAT_INCR(sctps_pdrpbwrpt); 4135 } 4136 } else if (offset + sizeof(struct sctphdr) > limit) { 4137 /* Only a partial SCTP common header. */ 4138 SCTP_STAT_INCR(sctps_pdrpcrupt); 4139 offset = limit; 4140 } else { 4141 /* XXX: Check embedded SCTP common header. */ 4142 offset += sizeof(struct sctphdr); 4143 } 4144 /* Now parse through the chunks themselves. */ 4145 while (offset < limit) { 4146 if (offset + sizeof(struct sctp_chunkhdr) > limit) { 4147 SCTP_STAT_INCR(sctps_pdrpcrupt); 4148 break; 4149 } 4150 chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset); 4151 desc.chunk_type = chk_hdr->chunk_type; 4152 /* get amount we need to move */ 4153 chk_len = (uint32_t)ntohs(chk_hdr->chunk_length); 4154 if (chk_len < sizeof(struct sctp_chunkhdr)) { 4155 /* Someone is lying... */ 4156 break; 4157 } 4158 if (desc.chunk_type == SCTP_DATA) { 4159 if (stcb->asoc.idata_supported) { 4160 /* Some is playing games with us. */ 4161 break; 4162 } 4163 if (chk_len <= sizeof(struct sctp_data_chunk)) { 4164 /* Some is playing games with us. */ 4165 break; 4166 } 4167 if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4168 /* 4169 * Not enough data bytes available in the 4170 * chunk. 4171 */ 4172 SCTP_STAT_INCR(sctps_pdrpnedat); 4173 goto next_chunk; 4174 } 4175 if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4176 /* Not enough data in buffer. */ 4177 break; 4178 } 4179 data_chunk = (struct sctp_data_chunk *)(cp->data + offset); 4180 memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4181 desc.tsn_ifany = data_chunk->dp.tsn; 4182 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4183 SCTP_STAT_INCR(sctps_pdrpmbda); 4184 } 4185 } else if (desc.chunk_type == SCTP_IDATA) { 4186 if (!stcb->asoc.idata_supported) { 4187 /* Some is playing games with us. */ 4188 break; 4189 } 4190 if (chk_len <= sizeof(struct sctp_idata_chunk)) { 4191 /* Some is playing games with us. */ 4192 break; 4193 } 4194 if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) { 4195 /* 4196 * Not enough data bytes available in the 4197 * chunk. 4198 */ 4199 SCTP_STAT_INCR(sctps_pdrpnedat); 4200 goto next_chunk; 4201 } 4202 if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) { 4203 /* Not enough data in buffer. */ 4204 break; 4205 } 4206 idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset); 4207 memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY); 4208 desc.tsn_ifany = idata_chunk->dp.tsn; 4209 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4210 SCTP_STAT_INCR(sctps_pdrpmbda); 4211 } 4212 } else { 4213 if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) { 4214 SCTP_STAT_INCR(sctps_pdrpmbct); 4215 } 4216 } 4217 if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) { 4218 SCTP_STAT_INCR(sctps_pdrppdbrk); 4219 break; 4220 } 4221 next_chunk: 4222 offset += SCTP_SIZE32(chk_len); 4223 } 4224 /* Now update any rwnd --- possibly */ 4225 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) { 4226 /* From a peer, we get a rwnd report */ 4227 uint32_t a_rwnd; 4228 4229 SCTP_STAT_INCR(sctps_pdrpfehos); 4230 4231 bottle_bw = ntohl(cp->bottle_bw); 4232 on_queue = ntohl(cp->current_onq); 4233 if (bottle_bw && on_queue) { 4234 /* a rwnd report is in here */ 4235 if (bottle_bw > on_queue) 4236 a_rwnd = bottle_bw - on_queue; 4237 else 4238 a_rwnd = 0; 4239 4240 if (a_rwnd == 0) 4241 stcb->asoc.peers_rwnd = 0; 4242 else { 4243 if (a_rwnd > stcb->asoc.total_flight) { 4244 stcb->asoc.peers_rwnd = 4245 a_rwnd - stcb->asoc.total_flight; 4246 } else { 4247 stcb->asoc.peers_rwnd = 0; 4248 } 4249 if (stcb->asoc.peers_rwnd < 4250 stcb->sctp_ep->sctp_ep.sctp_sws_sender) { 4251 /* SWS sender side engages */ 4252 stcb->asoc.peers_rwnd = 0; 4253 } 4254 } 4255 } 4256 } else { 4257 SCTP_STAT_INCR(sctps_pdrpfmbox); 4258 } 4259 4260 /* now middle boxes in sat networks get a cwnd bump */ 4261 if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) && 4262 (stcb->asoc.sat_t3_loss_recovery == 0) && 4263 (stcb->asoc.sat_network)) { 4264 /* 4265 * This is debatable but for sat networks it makes sense 4266 * Note if a T3 timer has went off, we will prohibit any 4267 * changes to cwnd until we exit the t3 loss recovery. 4268 */ 4269 stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb, 4270 net, cp, &bottle_bw, &on_queue); 4271 } 4272 } 4273 4274 /* 4275 * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to 4276 * still contain IP/SCTP header - stcb: is the tcb found for this packet - 4277 * offset: offset into the mbuf chain to first chunkhdr - length: is the 4278 * length of the complete packet outputs: - length: modified to remaining 4279 * length after control processing - netp: modified to new sctp_nets after 4280 * cookie-echo processing - return NULL to discard the packet (ie. no asoc, 4281 * bad packet,...) otherwise return the tcb for this packet 4282 */ 4283 #ifdef __GNUC__ 4284 __attribute__((noinline)) 4285 #endif 4286 static struct sctp_tcb * 4287 sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length, 4288 struct sockaddr *src, struct sockaddr *dst, 4289 struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp, 4290 struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen, 4291 uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum, 4292 uint32_t vrf_id, uint16_t port) 4293 { 4294 struct sctp_association *asoc; 4295 struct mbuf *op_err; 4296 char msg[SCTP_DIAG_INFO_LEN]; 4297 uint32_t vtag_in; 4298 int num_chunks = 0; /* number of control chunks processed */ 4299 uint32_t chk_length, contiguous; 4300 int ret; 4301 int abort_no_unlock = 0; 4302 int ecne_seen = 0; 4303 4304 /* 4305 * How big should this be, and should it be alloc'd? Lets try the 4306 * d-mtu-ceiling for now (2k) and that should hopefully work ... 4307 * until we get into jumbo grams and such.. 4308 */ 4309 uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE]; 4310 int got_auth = 0; 4311 uint32_t auth_offset = 0, auth_len = 0; 4312 int auth_skipped = 0; 4313 int asconf_cnt = 0; 4314 4315 SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n", 4316 iphlen, *offset, length, (void *)stcb); 4317 4318 if (stcb) { 4319 SCTP_TCB_LOCK_ASSERT(stcb); 4320 } 4321 /* validate chunk header length... */ 4322 if (ntohs(ch->chunk_length) < sizeof(*ch)) { 4323 SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n", 4324 ntohs(ch->chunk_length)); 4325 *offset = length; 4326 return (stcb); 4327 } 4328 /* 4329 * validate the verification tag 4330 */ 4331 vtag_in = ntohl(sh->v_tag); 4332 4333 if (ch->chunk_type == SCTP_INITIATION) { 4334 SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n", 4335 ntohs(ch->chunk_length), vtag_in); 4336 if (vtag_in != 0) { 4337 /* protocol error- silently discard... */ 4338 SCTP_STAT_INCR(sctps_badvtag); 4339 if (stcb != NULL) { 4340 SCTP_TCB_UNLOCK(stcb); 4341 } 4342 return (NULL); 4343 } 4344 } else if (ch->chunk_type != SCTP_COOKIE_ECHO) { 4345 /* 4346 * If there is no stcb, skip the AUTH chunk and process 4347 * later after a stcb is found (to validate the lookup was 4348 * valid. 4349 */ 4350 if ((ch->chunk_type == SCTP_AUTHENTICATION) && 4351 (stcb == NULL) && 4352 (inp->auth_supported == 1)) { 4353 /* save this chunk for later processing */ 4354 auth_skipped = 1; 4355 auth_offset = *offset; 4356 auth_len = ntohs(ch->chunk_length); 4357 4358 /* (temporarily) move past this chunk */ 4359 *offset += SCTP_SIZE32(auth_len); 4360 if (*offset >= length) { 4361 /* no more data left in the mbuf chain */ 4362 *offset = length; 4363 return (NULL); 4364 } 4365 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4366 sizeof(struct sctp_chunkhdr), chunk_buf); 4367 } 4368 if (ch == NULL) { 4369 /* Help */ 4370 *offset = length; 4371 return (stcb); 4372 } 4373 if (ch->chunk_type == SCTP_COOKIE_ECHO) { 4374 goto process_control_chunks; 4375 } 4376 /* 4377 * first check if it's an ASCONF with an unknown src addr we 4378 * need to look inside to find the association 4379 */ 4380 if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) { 4381 struct sctp_chunkhdr *asconf_ch = ch; 4382 uint32_t asconf_offset = 0, asconf_len = 0; 4383 4384 /* inp's refcount may be reduced */ 4385 SCTP_INP_INCR_REF(inp); 4386 4387 asconf_offset = *offset; 4388 do { 4389 asconf_len = ntohs(asconf_ch->chunk_length); 4390 if (asconf_len < sizeof(struct sctp_asconf_paramhdr)) 4391 break; 4392 stcb = sctp_findassociation_ep_asconf(m, 4393 *offset, 4394 dst, 4395 sh, &inp, netp, vrf_id); 4396 if (stcb != NULL) 4397 break; 4398 asconf_offset += SCTP_SIZE32(asconf_len); 4399 asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset, 4400 sizeof(struct sctp_chunkhdr), chunk_buf); 4401 } while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF); 4402 if (stcb == NULL) { 4403 /* 4404 * reduce inp's refcount if not reduced in 4405 * sctp_findassociation_ep_asconf(). 4406 */ 4407 SCTP_INP_DECR_REF(inp); 4408 } 4409 4410 /* now go back and verify any auth chunk to be sure */ 4411 if (auth_skipped && (stcb != NULL)) { 4412 struct sctp_auth_chunk *auth; 4413 4414 if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) { 4415 auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf); 4416 got_auth = 1; 4417 auth_skipped = 0; 4418 } else { 4419 auth = NULL; 4420 } 4421 if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, 4422 auth_offset)) { 4423 /* auth HMAC failed so dump it */ 4424 *offset = length; 4425 return (stcb); 4426 } else { 4427 /* remaining chunks are HMAC checked */ 4428 stcb->asoc.authenticated = 1; 4429 } 4430 } 4431 } 4432 if (stcb == NULL) { 4433 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4434 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4435 msg); 4436 /* no association, so it's out of the blue... */ 4437 sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err, 4438 mflowtype, mflowid, inp->fibnum, 4439 vrf_id, port); 4440 *offset = length; 4441 return (NULL); 4442 } 4443 asoc = &stcb->asoc; 4444 /* ABORT and SHUTDOWN can use either v_tag... */ 4445 if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) || 4446 (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) || 4447 (ch->chunk_type == SCTP_PACKET_DROPPED)) { 4448 /* Take the T-bit always into account. */ 4449 if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) && 4450 (vtag_in == asoc->my_vtag)) || 4451 (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) && 4452 (asoc->peer_vtag != htonl(0)) && 4453 (vtag_in == asoc->peer_vtag))) { 4454 /* this is valid */ 4455 } else { 4456 /* drop this packet... */ 4457 SCTP_STAT_INCR(sctps_badvtag); 4458 if (stcb != NULL) { 4459 SCTP_TCB_UNLOCK(stcb); 4460 } 4461 return (NULL); 4462 } 4463 } else if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 4464 if (vtag_in != asoc->my_vtag) { 4465 /* 4466 * this could be a stale SHUTDOWN-ACK or the 4467 * peer never got the SHUTDOWN-COMPLETE and 4468 * is still hung; we have started a new asoc 4469 * but it won't complete until the shutdown 4470 * is completed 4471 */ 4472 if (stcb != NULL) { 4473 SCTP_TCB_UNLOCK(stcb); 4474 } 4475 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 4476 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 4477 msg); 4478 sctp_handle_ootb(m, iphlen, *offset, src, dst, 4479 sh, inp, op_err, 4480 mflowtype, mflowid, fibnum, 4481 vrf_id, port); 4482 return (NULL); 4483 } 4484 } else { 4485 /* for all other chunks, vtag must match */ 4486 if (vtag_in != asoc->my_vtag) { 4487 /* invalid vtag... */ 4488 SCTPDBG(SCTP_DEBUG_INPUT3, 4489 "invalid vtag: %xh, expect %xh\n", 4490 vtag_in, asoc->my_vtag); 4491 SCTP_STAT_INCR(sctps_badvtag); 4492 if (stcb != NULL) { 4493 SCTP_TCB_UNLOCK(stcb); 4494 } 4495 *offset = length; 4496 return (NULL); 4497 } 4498 } 4499 } /* end if !SCTP_COOKIE_ECHO */ 4500 /* 4501 * process all control chunks... 4502 */ 4503 if (((ch->chunk_type == SCTP_SELECTIVE_ACK) || 4504 (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) || 4505 (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) && 4506 (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) { 4507 /* implied cookie-ack.. we must have lost the ack */ 4508 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, 4509 *netp); 4510 } 4511 4512 process_control_chunks: 4513 while (IS_SCTP_CONTROL(ch)) { 4514 /* validate chunk length */ 4515 chk_length = ntohs(ch->chunk_length); 4516 SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n", 4517 ch->chunk_type, chk_length); 4518 SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length); 4519 if (chk_length < sizeof(*ch) || 4520 (*offset + (int)chk_length) > length) { 4521 *offset = length; 4522 return (stcb); 4523 } 4524 SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks); 4525 /* 4526 * INIT and INIT-ACK only gets the init ack "header" portion 4527 * only because we don't have to process the peer's COOKIE. 4528 * All others get a complete chunk. 4529 */ 4530 switch (ch->chunk_type) { 4531 case SCTP_INITIATION: 4532 contiguous = sizeof(struct sctp_init_chunk); 4533 break; 4534 case SCTP_INITIATION_ACK: 4535 contiguous = sizeof(struct sctp_init_ack_chunk); 4536 break; 4537 default: 4538 contiguous = min(chk_length, sizeof(chunk_buf)); 4539 break; 4540 } 4541 ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset, 4542 contiguous, 4543 chunk_buf); 4544 if (ch == NULL) { 4545 *offset = length; 4546 if (stcb != NULL) { 4547 SCTP_TCB_UNLOCK(stcb); 4548 } 4549 return (NULL); 4550 } 4551 4552 num_chunks++; 4553 /* Save off the last place we got a control from */ 4554 if (stcb != NULL) { 4555 if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) { 4556 /* 4557 * allow last_control to be NULL if 4558 * ASCONF... ASCONF processing will find the 4559 * right net later 4560 */ 4561 if ((netp != NULL) && (*netp != NULL)) 4562 stcb->asoc.last_control_chunk_from = *netp; 4563 } 4564 } 4565 #ifdef SCTP_AUDITING_ENABLED 4566 sctp_audit_log(0xB0, ch->chunk_type); 4567 #endif 4568 4569 /* check to see if this chunk required auth, but isn't */ 4570 if ((stcb != NULL) && 4571 sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) && 4572 !stcb->asoc.authenticated) { 4573 /* "silently" ignore */ 4574 SCTP_STAT_INCR(sctps_recvauthmissing); 4575 goto next_chunk; 4576 } 4577 switch (ch->chunk_type) { 4578 case SCTP_INITIATION: 4579 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n"); 4580 /* The INIT chunk must be the only chunk. */ 4581 if ((num_chunks > 1) || 4582 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 4583 /* RFC 4960 requires that no ABORT is sent */ 4584 *offset = length; 4585 if (stcb != NULL) { 4586 SCTP_TCB_UNLOCK(stcb); 4587 } 4588 return (NULL); 4589 } 4590 /* Honor our resource limit. */ 4591 if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) { 4592 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4593 sctp_abort_association(inp, stcb, m, iphlen, 4594 src, dst, sh, op_err, 4595 mflowtype, mflowid, 4596 vrf_id, port); 4597 *offset = length; 4598 return (NULL); 4599 } 4600 sctp_handle_init(m, iphlen, *offset, src, dst, sh, 4601 (struct sctp_init_chunk *)ch, inp, 4602 stcb, *netp, &abort_no_unlock, 4603 mflowtype, mflowid, 4604 vrf_id, port); 4605 *offset = length; 4606 if ((!abort_no_unlock) && (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 *offset = length; 4786 return (stcb); 4787 } 4788 SCTP_STAT_INCR(sctps_recvheartbeatack); 4789 if ((netp != NULL) && (*netp != NULL)) { 4790 sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch, 4791 stcb, *netp); 4792 } 4793 break; 4794 case SCTP_ABORT_ASSOCIATION: 4795 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n", 4796 (void *)stcb); 4797 *offset = length; 4798 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4799 if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) { 4800 return (NULL); 4801 } else { 4802 return (stcb); 4803 } 4804 } else { 4805 return (NULL); 4806 } 4807 break; 4808 case SCTP_SHUTDOWN: 4809 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n", 4810 (void *)stcb); 4811 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) { 4812 *offset = length; 4813 return (stcb); 4814 } 4815 if ((netp != NULL) && (*netp != NULL)) { 4816 int abort_flag = 0; 4817 4818 sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch, 4819 stcb, *netp, &abort_flag); 4820 if (abort_flag) { 4821 *offset = length; 4822 return (NULL); 4823 } 4824 } 4825 break; 4826 case SCTP_SHUTDOWN_ACK: 4827 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb); 4828 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 4829 sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp); 4830 } 4831 *offset = length; 4832 return (NULL); 4833 break; 4834 case SCTP_OPERATION_ERROR: 4835 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n"); 4836 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) && 4837 sctp_handle_error(ch, stcb, *netp, contiguous) < 0) { 4838 *offset = length; 4839 return (NULL); 4840 } 4841 break; 4842 case SCTP_COOKIE_ECHO: 4843 SCTPDBG(SCTP_DEBUG_INPUT3, 4844 "SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb); 4845 if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) { 4846 ; 4847 } else { 4848 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4849 /* We are not interested anymore */ 4850 abend: 4851 if (stcb != NULL) { 4852 SCTP_TCB_UNLOCK(stcb); 4853 } 4854 *offset = length; 4855 return (NULL); 4856 } 4857 } 4858 /*- 4859 * First are we accepting? We do this again here 4860 * since it is possible that a previous endpoint WAS 4861 * listening responded to a INIT-ACK and then 4862 * closed. We opened and bound.. and are now no 4863 * longer listening. 4864 * 4865 * XXXGL: notes on checking listen queue length. 4866 * 1) SCTP_IS_LISTENING() doesn't necessarily mean 4867 * SOLISTENING(), because a listening "UDP type" 4868 * socket isn't listening in terms of the socket 4869 * layer. It is a normal data flow socket, that 4870 * can fork off new connections. Thus, we should 4871 * look into sol_qlen only in case we are !UDP. 4872 * 2) Checking sol_qlen in general requires locking 4873 * the socket, and this code lacks that. 4874 */ 4875 if ((stcb == NULL) && 4876 (!SCTP_IS_LISTENING(inp) || 4877 (!(inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) && 4878 inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) { 4879 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) && 4880 (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) { 4881 op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, ""); 4882 sctp_abort_association(inp, stcb, m, iphlen, 4883 src, dst, sh, op_err, 4884 mflowtype, mflowid, 4885 vrf_id, port); 4886 } 4887 *offset = length; 4888 return (NULL); 4889 } else { 4890 struct mbuf *ret_buf; 4891 struct sctp_inpcb *linp; 4892 struct sctp_tmit_chunk *chk; 4893 4894 if (stcb) { 4895 linp = NULL; 4896 } else { 4897 linp = inp; 4898 } 4899 4900 if (linp != NULL) { 4901 SCTP_ASOC_CREATE_LOCK(linp); 4902 if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || 4903 (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE)) { 4904 SCTP_ASOC_CREATE_UNLOCK(linp); 4905 goto abend; 4906 } 4907 } 4908 4909 if (netp != NULL) { 4910 struct sctp_tcb *locked_stcb; 4911 4912 locked_stcb = stcb; 4913 ret_buf = 4914 sctp_handle_cookie_echo(m, iphlen, 4915 *offset, 4916 src, dst, 4917 sh, 4918 (struct sctp_cookie_echo_chunk *)ch, 4919 &inp, &stcb, netp, 4920 auth_skipped, 4921 auth_offset, 4922 auth_len, 4923 &locked_stcb, 4924 mflowtype, 4925 mflowid, 4926 vrf_id, 4927 port); 4928 if ((locked_stcb != NULL) && (locked_stcb != stcb)) { 4929 SCTP_TCB_UNLOCK(locked_stcb); 4930 } 4931 if (stcb != NULL) { 4932 SCTP_TCB_LOCK_ASSERT(stcb); 4933 } 4934 } else { 4935 ret_buf = NULL; 4936 } 4937 if (linp != NULL) { 4938 SCTP_ASOC_CREATE_UNLOCK(linp); 4939 } 4940 if (ret_buf == NULL) { 4941 if (stcb != NULL) { 4942 SCTP_TCB_UNLOCK(stcb); 4943 } 4944 SCTPDBG(SCTP_DEBUG_INPUT3, 4945 "GAK, null buffer\n"); 4946 *offset = length; 4947 return (NULL); 4948 } 4949 /* if AUTH skipped, see if it verified... */ 4950 if (auth_skipped) { 4951 got_auth = 1; 4952 auth_skipped = 0; 4953 } 4954 /* Restart the timer if we have pending data */ 4955 TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) { 4956 if (chk->whoTo != NULL) { 4957 break; 4958 } 4959 } 4960 if (chk != NULL) { 4961 sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo); 4962 } 4963 } 4964 break; 4965 case SCTP_COOKIE_ACK: 4966 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb); 4967 if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) { 4968 return (stcb); 4969 } 4970 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 4971 /* We are not interested anymore */ 4972 if ((stcb) && (stcb->asoc.total_output_queue_size)) { 4973 ; 4974 } else if (stcb) { 4975 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 4976 SCTP_FROM_SCTP_INPUT + SCTP_LOC_30); 4977 *offset = length; 4978 return (NULL); 4979 } 4980 } 4981 if ((netp != NULL) && (*netp != NULL)) { 4982 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp); 4983 } 4984 break; 4985 case SCTP_ECN_ECHO: 4986 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n"); 4987 if ((stcb == NULL) || (chk_length != sizeof(struct sctp_ecne_chunk))) { 4988 /* Its not ours */ 4989 *offset = length; 4990 return (stcb); 4991 } 4992 if (stcb->asoc.ecn_supported == 0) { 4993 goto unknown_chunk; 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) || (chk_length != sizeof(struct sctp_cwr_chunk))) { 5001 *offset = length; 5002 return (stcb); 5003 } 5004 if (stcb->asoc.ecn_supported == 0) { 5005 goto unknown_chunk; 5006 } 5007 sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp); 5008 break; 5009 case SCTP_SHUTDOWN_COMPLETE: 5010 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb); 5011 /* must be first and only chunk */ 5012 if ((num_chunks > 1) || 5013 (length - *offset > (int)SCTP_SIZE32(chk_length))) { 5014 *offset = length; 5015 return (stcb); 5016 } 5017 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5018 sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch, 5019 stcb, *netp); 5020 } 5021 *offset = length; 5022 return (NULL); 5023 break; 5024 case SCTP_ASCONF: 5025 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n"); 5026 if (stcb != NULL) { 5027 if (stcb->asoc.asconf_supported == 0) { 5028 goto unknown_chunk; 5029 } 5030 sctp_handle_asconf(m, *offset, src, 5031 (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0); 5032 asconf_cnt++; 5033 } 5034 break; 5035 case SCTP_ASCONF_ACK: 5036 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n"); 5037 if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) { 5038 /* Its not ours */ 5039 *offset = length; 5040 return (stcb); 5041 } 5042 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5043 if (stcb->asoc.asconf_supported == 0) { 5044 goto unknown_chunk; 5045 } 5046 /* He's alive so give him credit */ 5047 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { 5048 sctp_misc_ints(SCTP_THRESHOLD_CLEAR, 5049 stcb->asoc.overall_error_count, 5050 0, 5051 SCTP_FROM_SCTP_INPUT, 5052 __LINE__); 5053 } 5054 stcb->asoc.overall_error_count = 0; 5055 sctp_handle_asconf_ack(m, *offset, 5056 (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock); 5057 if (abort_no_unlock) 5058 return (NULL); 5059 } 5060 break; 5061 case SCTP_FORWARD_CUM_TSN: 5062 case SCTP_IFORWARD_CUM_TSN: 5063 SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n", 5064 ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN"); 5065 if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) { 5066 /* Its not ours */ 5067 *offset = length; 5068 return (stcb); 5069 } 5070 5071 if (stcb != NULL) { 5072 int abort_flag = 0; 5073 5074 if (stcb->asoc.prsctp_supported == 0) { 5075 goto unknown_chunk; 5076 } 5077 if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) || 5078 ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) { 5079 if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) { 5080 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated"); 5081 } else { 5082 SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated"); 5083 } 5084 op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg); 5085 sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED); 5086 *offset = length; 5087 return (NULL); 5088 } 5089 *fwd_tsn_seen = 1; 5090 if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) { 5091 /* We are not interested anymore */ 5092 (void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC, 5093 SCTP_FROM_SCTP_INPUT + SCTP_LOC_31); 5094 *offset = length; 5095 return (NULL); 5096 } 5097 /* 5098 * For sending a SACK this looks like DATA 5099 * chunks. 5100 */ 5101 stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from; 5102 sctp_handle_forward_tsn(stcb, 5103 (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset); 5104 if (abort_flag) { 5105 *offset = length; 5106 return (NULL); 5107 } 5108 } 5109 break; 5110 case SCTP_STREAM_RESET: 5111 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n"); 5112 if ((stcb == NULL) || (chk_length < sizeof(struct sctp_stream_reset_tsn_req))) { 5113 /* Its not ours */ 5114 *offset = length; 5115 return (stcb); 5116 } 5117 if (stcb->asoc.reconfig_supported == 0) { 5118 goto unknown_chunk; 5119 } 5120 if (sctp_handle_stream_reset(stcb, m, *offset, ch)) { 5121 /* stop processing */ 5122 *offset = length; 5123 return (NULL); 5124 } 5125 break; 5126 case SCTP_PACKET_DROPPED: 5127 SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n"); 5128 /* re-get it all please */ 5129 if (chk_length < sizeof(struct sctp_pktdrop_chunk)) { 5130 /* Its not ours */ 5131 *offset = length; 5132 return (stcb); 5133 } 5134 5135 if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) { 5136 if (stcb->asoc.pktdrop_supported == 0) { 5137 goto unknown_chunk; 5138 } 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 goto next_chunk; 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 goto next_chunk; 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 uint32_t high_tsn; 5255 int fwd_tsn_seen = 0, data_processed = 0; 5256 struct mbuf *m = *mm, *op_err; 5257 char msg[SCTP_DIAG_INFO_LEN]; 5258 int un_sent; 5259 int cnt_ctrl_ready = 0; 5260 struct sctp_inpcb *inp = NULL, *inp_decr = NULL; 5261 struct sctp_tcb *stcb = NULL; 5262 struct sctp_nets *net = NULL; 5263 5264 SCTP_STAT_INCR(sctps_recvdatagrams); 5265 #ifdef SCTP_AUDITING_ENABLED 5266 sctp_audit_log(0xE0, 1); 5267 sctp_auditing(0, inp, stcb, net); 5268 #endif 5269 if (compute_crc != 0) { 5270 uint32_t check, calc_check; 5271 5272 check = sh->checksum; 5273 sh->checksum = 0; 5274 calc_check = sctp_calculate_cksum(m, iphlen); 5275 sh->checksum = check; 5276 if (calc_check != check) { 5277 SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x m:%p mlen:%d iphlen:%d\n", 5278 calc_check, check, (void *)m, length, iphlen); 5279 stcb = sctp_findassociation_addr(m, offset, src, dst, 5280 sh, ch, &inp, &net, vrf_id); 5281 #if defined(INET) || defined(INET6) 5282 if ((ch->chunk_type != SCTP_INITIATION) && 5283 (net != NULL) && (net->port != port)) { 5284 if (net->port == 0) { 5285 /* UDP encapsulation turned on. */ 5286 net->mtu -= sizeof(struct udphdr); 5287 if (stcb->asoc.smallest_mtu > net->mtu) { 5288 sctp_pathmtu_adjustment(stcb, net->mtu); 5289 } 5290 } else if (port == 0) { 5291 /* UDP encapsulation turned off. */ 5292 net->mtu += sizeof(struct udphdr); 5293 /* XXX Update smallest_mtu */ 5294 } 5295 net->port = port; 5296 } 5297 #endif 5298 if (net != NULL) { 5299 net->flowtype = mflowtype; 5300 net->flowid = mflowid; 5301 } 5302 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5303 if ((inp != NULL) && (stcb != NULL)) { 5304 sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1); 5305 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED); 5306 } else if ((inp != NULL) && (stcb == NULL)) { 5307 inp_decr = inp; 5308 } 5309 SCTP_STAT_INCR(sctps_badsum); 5310 SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors); 5311 goto out; 5312 } 5313 } 5314 /* Destination port of 0 is illegal, based on RFC4960. */ 5315 if (sh->dest_port == 0) { 5316 SCTP_STAT_INCR(sctps_hdrops); 5317 goto out; 5318 } 5319 stcb = sctp_findassociation_addr(m, offset, src, dst, 5320 sh, ch, &inp, &net, vrf_id); 5321 #if defined(INET) || defined(INET6) 5322 if ((ch->chunk_type != SCTP_INITIATION) && 5323 (net != NULL) && (net->port != port)) { 5324 if (net->port == 0) { 5325 /* UDP encapsulation turned on. */ 5326 net->mtu -= sizeof(struct udphdr); 5327 if (stcb->asoc.smallest_mtu > net->mtu) { 5328 sctp_pathmtu_adjustment(stcb, net->mtu); 5329 } 5330 } else if (port == 0) { 5331 /* UDP encapsulation turned off. */ 5332 net->mtu += sizeof(struct udphdr); 5333 /* XXX Update smallest_mtu */ 5334 } 5335 net->port = port; 5336 } 5337 #endif 5338 if (net != NULL) { 5339 net->flowtype = mflowtype; 5340 net->flowid = mflowid; 5341 } 5342 if (inp == NULL) { 5343 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5344 SCTP_STAT_INCR(sctps_noport); 5345 if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) { 5346 goto out; 5347 } 5348 if (ch->chunk_type == SCTP_SHUTDOWN_ACK) { 5349 sctp_send_shutdown_complete2(src, dst, sh, 5350 mflowtype, mflowid, fibnum, 5351 vrf_id, port); 5352 goto out; 5353 } 5354 if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) { 5355 goto out; 5356 } 5357 if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) { 5358 if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) || 5359 ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) && 5360 (ch->chunk_type != SCTP_INIT))) { 5361 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5362 "Out of the blue"); 5363 sctp_send_abort(m, iphlen, src, dst, 5364 sh, 0, op_err, 5365 mflowtype, mflowid, fibnum, 5366 vrf_id, port); 5367 } 5368 } 5369 goto out; 5370 } else if (stcb == NULL) { 5371 inp_decr = inp; 5372 } 5373 SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n", 5374 (void *)m, iphlen, offset, length, (void *)stcb); 5375 if (stcb) { 5376 /* always clear this before beginning a packet */ 5377 stcb->asoc.authenticated = 0; 5378 stcb->asoc.seen_a_sack_this_pkt = 0; 5379 SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n", 5380 (void *)stcb, stcb->asoc.state); 5381 5382 if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) || 5383 (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) { 5384 /*- 5385 * If we hit here, we had a ref count 5386 * up when the assoc was aborted and the 5387 * timer is clearing out the assoc, we should 5388 * NOT respond to any packet.. its OOTB. 5389 */ 5390 SCTP_TCB_UNLOCK(stcb); 5391 stcb = NULL; 5392 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5393 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5394 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5395 msg); 5396 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5397 mflowtype, mflowid, inp->fibnum, 5398 vrf_id, port); 5399 goto out; 5400 } 5401 } 5402 if (IS_SCTP_CONTROL(ch)) { 5403 /* process the control portion of the SCTP packet */ 5404 /* sa_ignore NO_NULL_CHK */ 5405 stcb = sctp_process_control(m, iphlen, &offset, length, 5406 src, dst, sh, ch, 5407 inp, stcb, &net, &fwd_tsn_seen, 5408 mflowtype, mflowid, fibnum, 5409 vrf_id, port); 5410 if (stcb) { 5411 /* 5412 * This covers us if the cookie-echo was there and 5413 * it changes our INP. 5414 */ 5415 inp = stcb->sctp_ep; 5416 #if defined(INET) || defined(INET6) 5417 if ((ch->chunk_type != SCTP_INITIATION) && 5418 (net != NULL) && (net->port != port)) { 5419 if (net->port == 0) { 5420 /* UDP encapsulation turned on. */ 5421 net->mtu -= sizeof(struct udphdr); 5422 if (stcb->asoc.smallest_mtu > net->mtu) { 5423 sctp_pathmtu_adjustment(stcb, net->mtu); 5424 } 5425 } else if (port == 0) { 5426 /* UDP encapsulation turned off. */ 5427 net->mtu += sizeof(struct udphdr); 5428 /* XXX Update smallest_mtu */ 5429 } 5430 net->port = port; 5431 } 5432 #endif 5433 } 5434 } else { 5435 /* 5436 * no control chunks, so pre-process DATA chunks (these 5437 * checks are taken care of by control processing) 5438 */ 5439 5440 /* 5441 * if DATA only packet, and auth is required, then punt... 5442 * can't have authenticated without any AUTH (control) 5443 * chunks 5444 */ 5445 if ((stcb != NULL) && 5446 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) { 5447 /* "silently" ignore */ 5448 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5449 SCTP_STAT_INCR(sctps_recvauthmissing); 5450 goto out; 5451 } 5452 if (stcb == NULL) { 5453 /* out of the blue DATA chunk */ 5454 SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh); 5455 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5456 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5457 msg); 5458 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5459 mflowtype, mflowid, fibnum, 5460 vrf_id, port); 5461 goto out; 5462 } 5463 if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) { 5464 /* v_tag mismatch! */ 5465 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5466 SCTP_STAT_INCR(sctps_badvtag); 5467 goto out; 5468 } 5469 } 5470 5471 SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh); 5472 if (stcb == NULL) { 5473 /* 5474 * no valid TCB for this packet, or we found it's a bad 5475 * packet while processing control, or we're done with this 5476 * packet (done or skip rest of data), so we drop it... 5477 */ 5478 goto out; 5479 } 5480 5481 /* 5482 * DATA chunk processing 5483 */ 5484 /* plow through the data chunks while length > offset */ 5485 5486 /* 5487 * Rest should be DATA only. Check authentication state if AUTH for 5488 * DATA is required. 5489 */ 5490 if ((length > offset) && 5491 (stcb != NULL) && 5492 sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) && 5493 !stcb->asoc.authenticated) { 5494 /* "silently" ignore */ 5495 SCTP_STAT_INCR(sctps_recvauthmissing); 5496 SCTPDBG(SCTP_DEBUG_AUTH1, 5497 "Data chunk requires AUTH, skipped\n"); 5498 goto trigger_send; 5499 } 5500 if (length > offset) { 5501 int retval; 5502 5503 /* 5504 * First check to make sure our state is correct. We would 5505 * not get here unless we really did have a tag, so we don't 5506 * abort if this happens, just dump the chunk silently. 5507 */ 5508 switch (SCTP_GET_STATE(stcb)) { 5509 case SCTP_STATE_COOKIE_ECHOED: 5510 /* 5511 * we consider data with valid tags in this state 5512 * shows us the cookie-ack was lost. Imply it was 5513 * there. 5514 */ 5515 sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net); 5516 break; 5517 case SCTP_STATE_COOKIE_WAIT: 5518 /* 5519 * We consider OOTB any data sent during asoc setup. 5520 */ 5521 SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__); 5522 op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code), 5523 msg); 5524 sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err, 5525 mflowtype, mflowid, inp->fibnum, 5526 vrf_id, port); 5527 goto out; 5528 /* sa_ignore NOTREACHED */ 5529 break; 5530 case SCTP_STATE_EMPTY: /* should not happen */ 5531 case SCTP_STATE_INUSE: /* should not happen */ 5532 case SCTP_STATE_SHUTDOWN_RECEIVED: /* This is a peer error */ 5533 case SCTP_STATE_SHUTDOWN_ACK_SENT: 5534 default: 5535 goto out; 5536 /* sa_ignore NOTREACHED */ 5537 break; 5538 case SCTP_STATE_OPEN: 5539 case SCTP_STATE_SHUTDOWN_SENT: 5540 break; 5541 } 5542 /* plow through the data chunks while length > offset */ 5543 retval = sctp_process_data(mm, iphlen, &offset, length, 5544 inp, stcb, net, &high_tsn); 5545 if (retval == 2) { 5546 /* 5547 * The association aborted, NO UNLOCK needed since 5548 * the association is destroyed. 5549 */ 5550 stcb = NULL; 5551 goto out; 5552 } 5553 if (retval == 0) { 5554 data_processed = 1; 5555 } 5556 /* 5557 * Anything important needs to have been m_copy'ed in 5558 * process_data 5559 */ 5560 } 5561 5562 /* take care of ecn */ 5563 if ((data_processed == 1) && 5564 (stcb->asoc.ecn_supported == 1) && 5565 ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) { 5566 /* Yep, we need to add a ECNE */ 5567 sctp_send_ecn_echo(stcb, net, high_tsn); 5568 } 5569 5570 if ((data_processed == 0) && (fwd_tsn_seen)) { 5571 int was_a_gap; 5572 uint32_t highest_tsn; 5573 5574 if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) { 5575 highest_tsn = stcb->asoc.highest_tsn_inside_nr_map; 5576 } else { 5577 highest_tsn = stcb->asoc.highest_tsn_inside_map; 5578 } 5579 was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn); 5580 stcb->asoc.send_sack = 1; 5581 sctp_sack_check(stcb, was_a_gap); 5582 } else if (fwd_tsn_seen) { 5583 stcb->asoc.send_sack = 1; 5584 } 5585 /* trigger send of any chunks in queue... */ 5586 trigger_send: 5587 #ifdef SCTP_AUDITING_ENABLED 5588 sctp_audit_log(0xE0, 2); 5589 sctp_auditing(1, inp, stcb, net); 5590 #endif 5591 SCTPDBG(SCTP_DEBUG_INPUT1, 5592 "Check for chunk output prw:%d tqe:%d tf=%d\n", 5593 stcb->asoc.peers_rwnd, 5594 TAILQ_EMPTY(&stcb->asoc.control_send_queue), 5595 stcb->asoc.total_flight); 5596 un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight); 5597 if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) { 5598 cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq; 5599 } 5600 if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) || 5601 cnt_ctrl_ready || 5602 stcb->asoc.trigger_reset || 5603 ((un_sent > 0) && 5604 (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) { 5605 SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n"); 5606 sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED); 5607 SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n"); 5608 } 5609 #ifdef SCTP_AUDITING_ENABLED 5610 sctp_audit_log(0xE0, 3); 5611 sctp_auditing(2, inp, stcb, net); 5612 #endif 5613 out: 5614 if (stcb != NULL) { 5615 SCTP_TCB_UNLOCK(stcb); 5616 } 5617 if (inp_decr != NULL) { 5618 /* reduce ref-count */ 5619 SCTP_INP_WLOCK(inp_decr); 5620 SCTP_INP_DECR_REF(inp_decr); 5621 SCTP_INP_WUNLOCK(inp_decr); 5622 } 5623 return; 5624 } 5625 5626 #ifdef INET 5627 void 5628 sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port) 5629 { 5630 struct mbuf *m; 5631 int iphlen; 5632 uint32_t vrf_id = 0; 5633 uint8_t ecn_bits; 5634 struct sockaddr_in src, dst; 5635 struct ip *ip; 5636 struct sctphdr *sh; 5637 struct sctp_chunkhdr *ch; 5638 int length, offset; 5639 uint8_t compute_crc; 5640 uint32_t mflowid; 5641 uint8_t mflowtype; 5642 uint16_t fibnum; 5643 5644 iphlen = off; 5645 if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) { 5646 SCTP_RELEASE_PKT(i_pak); 5647 return; 5648 } 5649 m = SCTP_HEADER_TO_CHAIN(i_pak); 5650 #ifdef SCTP_MBUF_LOGGING 5651 /* Log in any input mbufs */ 5652 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { 5653 sctp_log_mbc(m, SCTP_MBUF_INPUT); 5654 } 5655 #endif 5656 #ifdef SCTP_PACKET_LOGGING 5657 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) { 5658 sctp_packet_log(m); 5659 } 5660 #endif 5661 SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, 5662 "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n", 5663 m->m_pkthdr.len, 5664 if_name(m->m_pkthdr.rcvif), 5665 (int)m->m_pkthdr.csum_flags, CSUM_BITS); 5666 mflowid = m->m_pkthdr.flowid; 5667 mflowtype = M_HASHTYPE_GET(m); 5668 fibnum = M_GETFIB(m); 5669 SCTP_STAT_INCR(sctps_recvpackets); 5670 SCTP_STAT_INCR_COUNTER64(sctps_inpackets); 5671 /* Get IP, SCTP, and first chunk header together in the first mbuf. */ 5672 offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr); 5673 if (SCTP_BUF_LEN(m) < offset) { 5674 if ((m = m_pullup(m, offset)) == NULL) { 5675 SCTP_STAT_INCR(sctps_hdrops); 5676 return; 5677 } 5678 } 5679 ip = mtod(m, struct ip *); 5680 sh = (struct sctphdr *)((caddr_t)ip + iphlen); 5681 ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr)); 5682 offset -= sizeof(struct sctp_chunkhdr); 5683 memset(&src, 0, sizeof(struct sockaddr_in)); 5684 src.sin_family = AF_INET; 5685 src.sin_len = sizeof(struct sockaddr_in); 5686 src.sin_port = sh->src_port; 5687 src.sin_addr = ip->ip_src; 5688 memset(&dst, 0, sizeof(struct sockaddr_in)); 5689 dst.sin_family = AF_INET; 5690 dst.sin_len = sizeof(struct sockaddr_in); 5691 dst.sin_port = sh->dest_port; 5692 dst.sin_addr = ip->ip_dst; 5693 length = ntohs(ip->ip_len); 5694 /* Validate mbuf chain length with IP payload length. */ 5695 if (SCTP_HEADER_LEN(m) != length) { 5696 SCTPDBG(SCTP_DEBUG_INPUT1, 5697 "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m)); 5698 SCTP_STAT_INCR(sctps_hdrops); 5699 goto out; 5700 } 5701 /* SCTP does not allow broadcasts or multicasts */ 5702 if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) { 5703 goto out; 5704 } 5705 if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) { 5706 goto out; 5707 } 5708 ecn_bits = ip->ip_tos; 5709 if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) { 5710 SCTP_STAT_INCR(sctps_recvhwcrc); 5711 compute_crc = 0; 5712 } else { 5713 SCTP_STAT_INCR(sctps_recvswcrc); 5714 compute_crc = 1; 5715 } 5716 sctp_common_input_processing(&m, iphlen, offset, length, 5717 (struct sockaddr *)&src, 5718 (struct sockaddr *)&dst, 5719 sh, ch, 5720 compute_crc, 5721 ecn_bits, 5722 mflowtype, mflowid, fibnum, 5723 vrf_id, port); 5724 out: 5725 if (m) { 5726 sctp_m_freem(m); 5727 } 5728 return; 5729 } 5730 5731 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5732 extern int *sctp_cpuarry; 5733 #endif 5734 5735 int 5736 sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED) 5737 { 5738 struct mbuf *m; 5739 int off; 5740 5741 m = *mp; 5742 off = *offp; 5743 #if defined(SCTP_MCORE_INPUT) && defined(SMP) 5744 if (mp_ncpus > 1) { 5745 struct ip *ip; 5746 struct sctphdr *sh; 5747 int offset; 5748 int cpu_to_use; 5749 uint32_t flowid, tag; 5750 5751 if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) { 5752 flowid = m->m_pkthdr.flowid; 5753 } else { 5754 /* 5755 * No flow id built by lower layers fix it so we 5756 * create one. 5757 */ 5758 offset = off + sizeof(struct sctphdr); 5759 if (SCTP_BUF_LEN(m) < offset) { 5760 if ((m = m_pullup(m, offset)) == NULL) { 5761 SCTP_STAT_INCR(sctps_hdrops); 5762 return (IPPROTO_DONE); 5763 } 5764 } 5765 ip = mtod(m, struct ip *); 5766 sh = (struct sctphdr *)((caddr_t)ip + off); 5767 tag = htonl(sh->v_tag); 5768 flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port); 5769 m->m_pkthdr.flowid = flowid; 5770 M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH); 5771 } 5772 cpu_to_use = sctp_cpuarry[flowid % mp_ncpus]; 5773 sctp_queue_to_mcore(m, off, cpu_to_use); 5774 return (IPPROTO_DONE); 5775 } 5776 #endif 5777 sctp_input_with_port(m, off, 0); 5778 return (IPPROTO_DONE); 5779 } 5780 #endif 5781